root/drivers/scsi/ncr53c8xx.c

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DEFINITIONS

This source file includes following definitions.
  1. ncr_list_pop
  2. ___m_alloc
  3. ___m_free
  4. __m_calloc2
  5. __m_free
  6. ___mp0_getp
  7. ___mp0_freep
  8. ___dma_getp
  9. ___dma_freep
  10. ___get_dma_pool
  11. ___cre_dma_pool
  12. ___del_dma_pool
  13. __m_calloc_dma
  14. __m_free_dma
  15. __vtobus
  16. __unmap_scsi_data
  17. __map_scsi_sg_data
  18. get_setup_token
  19. sym53c8xx__setup
  20. device_queue_depth
  21. ncr_name
  22. ncr_script_fill
  23. ncr_script_copy_and_bind
  24. ncr_print_msg
  25. ncr_init_burst
  26. ncr_prepare_setting
  27. ncr_queue_done_cmd
  28. ncr_flush_done_cmds
  29. ncr_prepare_nego
  30. ncr_queue_command
  31. ncr_start_next_ccb
  32. ncr_put_start_queue
  33. ncr_reset_scsi_bus
  34. ncr_start_reset
  35. ncr_reset_bus
  36. ncr_abort_command
  37. ncr_detach
  38. ncr_complete
  39. ncr_ccb_skipped
  40. ncr_wakeup_done
  41. ncr_wakeup
  42. ncr_chip_reset
  43. ncr_init
  44. ncr_negotiate
  45. ncr_getsync
  46. ncr_set_sync_wide_status
  47. ncr_setsync
  48. ncr_setwide
  49. ncr_setup_tags
  50. ncr_timeout
  51. ncr_log_hard_error
  52. ncr_exception
  53. ncr_int_sto
  54. ncr_int_sbmc
  55. ncr_int_par
  56. ncr_int_ma
  57. ncr_sir_to_redo
  58. ncr_int_sir
  59. ncr_get_ccb
  60. ncr_free_ccb
  61. ncr_init_ccb
  62. ncr_alloc_ccb
  63. ncr_init_tcb
  64. ncr_alloc_lcb
  65. ncr_setup_lcb
  66. ncr_scatter
  67. ncr_regtest
  68. ncr_snooptest
  69. ncr_selectclock
  70. ncrgetfreq
  71. ncr_getclock
  72. ncr53c8xx_slave_alloc
  73. ncr53c8xx_slave_configure
  74. ncr53c8xx_queue_command_lck
  75. DEF_SCSI_QCMD
  76. ncr53c8xx_timeout
  77. ncr53c8xx_bus_reset
  78. ncr53c8xx_abort
  79. insert_into_waiting_list
  80. retrieve_from_waiting_list
  81. process_waiting_list
  82. show_ncr53c8xx_revision
  83. ncr53c8xx_setup
  84. ncr_attach
  85. ncr53c8xx_release
  86. ncr53c8xx_set_period
  87. ncr53c8xx_set_offset
  88. ncr53c8xx_set_width
  89. ncr53c8xx_get_signalling
  90. ncr53c8xx_init
  91. ncr53c8xx_exit

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /******************************************************************************
   3 **  Device driver for the PCI-SCSI NCR538XX controller family.
   4 **
   5 **  Copyright (C) 1994  Wolfgang Stanglmeier
   6 **
   7 **
   8 **-----------------------------------------------------------------------------
   9 **
  10 **  This driver has been ported to Linux from the FreeBSD NCR53C8XX driver
  11 **  and is currently maintained by
  12 **
  13 **          Gerard Roudier              <groudier@free.fr>
  14 **
  15 **  Being given that this driver originates from the FreeBSD version, and
  16 **  in order to keep synergy on both, any suggested enhancements and corrections
  17 **  received on Linux are automatically a potential candidate for the FreeBSD 
  18 **  version.
  19 **
  20 **  The original driver has been written for 386bsd and FreeBSD by
  21 **          Wolfgang Stanglmeier        <wolf@cologne.de>
  22 **          Stefan Esser                <se@mi.Uni-Koeln.de>
  23 **
  24 **  And has been ported to NetBSD by
  25 **          Charles M. Hannum           <mycroft@gnu.ai.mit.edu>
  26 **
  27 **-----------------------------------------------------------------------------
  28 **
  29 **                     Brief history
  30 **
  31 **  December 10 1995 by Gerard Roudier:
  32 **     Initial port to Linux.
  33 **
  34 **  June 23 1996 by Gerard Roudier:
  35 **     Support for 64 bits architectures (Alpha).
  36 **
  37 **  November 30 1996 by Gerard Roudier:
  38 **     Support for Fast-20 scsi.
  39 **     Support for large DMA fifo and 128 dwords bursting.
  40 **
  41 **  February 27 1997 by Gerard Roudier:
  42 **     Support for Fast-40 scsi.
  43 **     Support for on-Board RAM.
  44 **
  45 **  May 3 1997 by Gerard Roudier:
  46 **     Full support for scsi scripts instructions pre-fetching.
  47 **
  48 **  May 19 1997 by Richard Waltham <dormouse@farsrobt.demon.co.uk>:
  49 **     Support for NvRAM detection and reading.
  50 **
  51 **  August 18 1997 by Cort <cort@cs.nmt.edu>:
  52 **     Support for Power/PC (Big Endian).
  53 **
  54 **  June 20 1998 by Gerard Roudier
  55 **     Support for up to 64 tags per lun.
  56 **     O(1) everywhere (C and SCRIPTS) for normal cases.
  57 **     Low PCI traffic for command handling when on-chip RAM is present.
  58 **     Aggressive SCSI SCRIPTS optimizations.
  59 **
  60 **  2005 by Matthew Wilcox and James Bottomley
  61 **     PCI-ectomy.  This driver now supports only the 720 chip (see the
  62 **     NCR_Q720 and zalon drivers for the bus probe logic).
  63 **
  64 *******************************************************************************
  65 */
  66 
  67 /*
  68 **      Supported SCSI-II features:
  69 **          Synchronous negotiation
  70 **          Wide negotiation        (depends on the NCR Chip)
  71 **          Enable disconnection
  72 **          Tagged command queuing
  73 **          Parity checking
  74 **          Etc...
  75 **
  76 **      Supported NCR/SYMBIOS chips:
  77 **              53C720          (Wide,   Fast SCSI-2, intfly problems)
  78 */
  79 
  80 /* Name and version of the driver */
  81 #define SCSI_NCR_DRIVER_NAME    "ncr53c8xx-3.4.3g"
  82 
  83 #define SCSI_NCR_DEBUG_FLAGS    (0)
  84 
  85 #include <linux/blkdev.h>
  86 #include <linux/delay.h>
  87 #include <linux/dma-mapping.h>
  88 #include <linux/errno.h>
  89 #include <linux/gfp.h>
  90 #include <linux/init.h>
  91 #include <linux/interrupt.h>
  92 #include <linux/ioport.h>
  93 #include <linux/mm.h>
  94 #include <linux/module.h>
  95 #include <linux/sched.h>
  96 #include <linux/signal.h>
  97 #include <linux/spinlock.h>
  98 #include <linux/stat.h>
  99 #include <linux/string.h>
 100 #include <linux/time.h>
 101 #include <linux/timer.h>
 102 #include <linux/types.h>
 103 
 104 #include <asm/dma.h>
 105 #include <asm/io.h>
 106 
 107 #include <scsi/scsi.h>
 108 #include <scsi/scsi_cmnd.h>
 109 #include <scsi/scsi_dbg.h>
 110 #include <scsi/scsi_device.h>
 111 #include <scsi/scsi_tcq.h>
 112 #include <scsi/scsi_transport.h>
 113 #include <scsi/scsi_transport_spi.h>
 114 
 115 #include "ncr53c8xx.h"
 116 
 117 #define NAME53C8XX              "ncr53c8xx"
 118 
 119 /*==========================================================
 120 **
 121 **      Debugging tags
 122 **
 123 **==========================================================
 124 */
 125 
 126 #define DEBUG_ALLOC    (0x0001)
 127 #define DEBUG_PHASE    (0x0002)
 128 #define DEBUG_QUEUE    (0x0008)
 129 #define DEBUG_RESULT   (0x0010)
 130 #define DEBUG_POINTER  (0x0020)
 131 #define DEBUG_SCRIPT   (0x0040)
 132 #define DEBUG_TINY     (0x0080)
 133 #define DEBUG_TIMING   (0x0100)
 134 #define DEBUG_NEGO     (0x0200)
 135 #define DEBUG_TAGS     (0x0400)
 136 #define DEBUG_SCATTER  (0x0800)
 137 #define DEBUG_IC        (0x1000)
 138 
 139 /*
 140 **    Enable/Disable debug messages.
 141 **    Can be changed at runtime too.
 142 */
 143 
 144 #ifdef SCSI_NCR_DEBUG_INFO_SUPPORT
 145 static int ncr_debug = SCSI_NCR_DEBUG_FLAGS;
 146         #define DEBUG_FLAGS ncr_debug
 147 #else
 148         #define DEBUG_FLAGS     SCSI_NCR_DEBUG_FLAGS
 149 #endif
 150 
 151 static inline struct list_head *ncr_list_pop(struct list_head *head)
 152 {
 153         if (!list_empty(head)) {
 154                 struct list_head *elem = head->next;
 155 
 156                 list_del(elem);
 157                 return elem;
 158         }
 159 
 160         return NULL;
 161 }
 162 
 163 /*==========================================================
 164 **
 165 **      Simple power of two buddy-like allocator.
 166 **
 167 **      This simple code is not intended to be fast, but to 
 168 **      provide power of 2 aligned memory allocations.
 169 **      Since the SCRIPTS processor only supplies 8 bit 
 170 **      arithmetic, this allocator allows simple and fast 
 171 **      address calculations  from the SCRIPTS code.
 172 **      In addition, cache line alignment is guaranteed for 
 173 **      power of 2 cache line size.
 174 **      Enhanced in linux-2.3.44 to provide a memory pool 
 175 **      per pcidev to support dynamic dma mapping. (I would 
 176 **      have preferred a real bus abstraction, btw).
 177 **
 178 **==========================================================
 179 */
 180 
 181 #define MEMO_SHIFT      4       /* 16 bytes minimum memory chunk */
 182 #if PAGE_SIZE >= 8192
 183 #define MEMO_PAGE_ORDER 0       /* 1 PAGE  maximum */
 184 #else
 185 #define MEMO_PAGE_ORDER 1       /* 2 PAGES maximum */
 186 #endif
 187 #define MEMO_FREE_UNUSED        /* Free unused pages immediately */
 188 #define MEMO_WARN       1
 189 #define MEMO_GFP_FLAGS  GFP_ATOMIC
 190 #define MEMO_CLUSTER_SHIFT      (PAGE_SHIFT+MEMO_PAGE_ORDER)
 191 #define MEMO_CLUSTER_SIZE       (1UL << MEMO_CLUSTER_SHIFT)
 192 #define MEMO_CLUSTER_MASK       (MEMO_CLUSTER_SIZE-1)
 193 
 194 typedef u_long m_addr_t;        /* Enough bits to bit-hack addresses */
 195 typedef struct device *m_bush_t;        /* Something that addresses DMAable */
 196 
 197 typedef struct m_link {         /* Link between free memory chunks */
 198         struct m_link *next;
 199 } m_link_s;
 200 
 201 typedef struct m_vtob {         /* Virtual to Bus address translation */
 202         struct m_vtob *next;
 203         m_addr_t vaddr;
 204         m_addr_t baddr;
 205 } m_vtob_s;
 206 #define VTOB_HASH_SHIFT         5
 207 #define VTOB_HASH_SIZE          (1UL << VTOB_HASH_SHIFT)
 208 #define VTOB_HASH_MASK          (VTOB_HASH_SIZE-1)
 209 #define VTOB_HASH_CODE(m)       \
 210         ((((m_addr_t) (m)) >> MEMO_CLUSTER_SHIFT) & VTOB_HASH_MASK)
 211 
 212 typedef struct m_pool {         /* Memory pool of a given kind */
 213         m_bush_t bush;
 214         m_addr_t (*getp)(struct m_pool *);
 215         void (*freep)(struct m_pool *, m_addr_t);
 216         int nump;
 217         m_vtob_s *(vtob[VTOB_HASH_SIZE]);
 218         struct m_pool *next;
 219         struct m_link h[PAGE_SHIFT-MEMO_SHIFT+MEMO_PAGE_ORDER+1];
 220 } m_pool_s;
 221 
 222 static void *___m_alloc(m_pool_s *mp, int size)
 223 {
 224         int i = 0;
 225         int s = (1 << MEMO_SHIFT);
 226         int j;
 227         m_addr_t a;
 228         m_link_s *h = mp->h;
 229 
 230         if (size > (PAGE_SIZE << MEMO_PAGE_ORDER))
 231                 return NULL;
 232 
 233         while (size > s) {
 234                 s <<= 1;
 235                 ++i;
 236         }
 237 
 238         j = i;
 239         while (!h[j].next) {
 240                 if (s == (PAGE_SIZE << MEMO_PAGE_ORDER)) {
 241                         h[j].next = (m_link_s *)mp->getp(mp);
 242                         if (h[j].next)
 243                                 h[j].next->next = NULL;
 244                         break;
 245                 }
 246                 ++j;
 247                 s <<= 1;
 248         }
 249         a = (m_addr_t) h[j].next;
 250         if (a) {
 251                 h[j].next = h[j].next->next;
 252                 while (j > i) {
 253                         j -= 1;
 254                         s >>= 1;
 255                         h[j].next = (m_link_s *) (a+s);
 256                         h[j].next->next = NULL;
 257                 }
 258         }
 259 #ifdef DEBUG
 260         printk("___m_alloc(%d) = %p\n", size, (void *) a);
 261 #endif
 262         return (void *) a;
 263 }
 264 
 265 static void ___m_free(m_pool_s *mp, void *ptr, int size)
 266 {
 267         int i = 0;
 268         int s = (1 << MEMO_SHIFT);
 269         m_link_s *q;
 270         m_addr_t a, b;
 271         m_link_s *h = mp->h;
 272 
 273 #ifdef DEBUG
 274         printk("___m_free(%p, %d)\n", ptr, size);
 275 #endif
 276 
 277         if (size > (PAGE_SIZE << MEMO_PAGE_ORDER))
 278                 return;
 279 
 280         while (size > s) {
 281                 s <<= 1;
 282                 ++i;
 283         }
 284 
 285         a = (m_addr_t) ptr;
 286 
 287         while (1) {
 288 #ifdef MEMO_FREE_UNUSED
 289                 if (s == (PAGE_SIZE << MEMO_PAGE_ORDER)) {
 290                         mp->freep(mp, a);
 291                         break;
 292                 }
 293 #endif
 294                 b = a ^ s;
 295                 q = &h[i];
 296                 while (q->next && q->next != (m_link_s *) b) {
 297                         q = q->next;
 298                 }
 299                 if (!q->next) {
 300                         ((m_link_s *) a)->next = h[i].next;
 301                         h[i].next = (m_link_s *) a;
 302                         break;
 303                 }
 304                 q->next = q->next->next;
 305                 a = a & b;
 306                 s <<= 1;
 307                 ++i;
 308         }
 309 }
 310 
 311 static DEFINE_SPINLOCK(ncr53c8xx_lock);
 312 
 313 static void *__m_calloc2(m_pool_s *mp, int size, char *name, int uflags)
 314 {
 315         void *p;
 316 
 317         p = ___m_alloc(mp, size);
 318 
 319         if (DEBUG_FLAGS & DEBUG_ALLOC)
 320                 printk ("new %-10s[%4d] @%p.\n", name, size, p);
 321 
 322         if (p)
 323                 memset(p, 0, size);
 324         else if (uflags & MEMO_WARN)
 325                 printk (NAME53C8XX ": failed to allocate %s[%d]\n", name, size);
 326 
 327         return p;
 328 }
 329 
 330 #define __m_calloc(mp, s, n)    __m_calloc2(mp, s, n, MEMO_WARN)
 331 
 332 static void __m_free(m_pool_s *mp, void *ptr, int size, char *name)
 333 {
 334         if (DEBUG_FLAGS & DEBUG_ALLOC)
 335                 printk ("freeing %-10s[%4d] @%p.\n", name, size, ptr);
 336 
 337         ___m_free(mp, ptr, size);
 338 
 339 }
 340 
 341 /*
 342  * With pci bus iommu support, we use a default pool of unmapped memory 
 343  * for memory we donnot need to DMA from/to and one pool per pcidev for 
 344  * memory accessed by the PCI chip. `mp0' is the default not DMAable pool.
 345  */
 346 
 347 static m_addr_t ___mp0_getp(m_pool_s *mp)
 348 {
 349         m_addr_t m = __get_free_pages(MEMO_GFP_FLAGS, MEMO_PAGE_ORDER);
 350         if (m)
 351                 ++mp->nump;
 352         return m;
 353 }
 354 
 355 static void ___mp0_freep(m_pool_s *mp, m_addr_t m)
 356 {
 357         free_pages(m, MEMO_PAGE_ORDER);
 358         --mp->nump;
 359 }
 360 
 361 static m_pool_s mp0 = {NULL, ___mp0_getp, ___mp0_freep};
 362 
 363 /*
 364  * DMAable pools.
 365  */
 366 
 367 /*
 368  * With pci bus iommu support, we maintain one pool per pcidev and a 
 369  * hashed reverse table for virtual to bus physical address translations.
 370  */
 371 static m_addr_t ___dma_getp(m_pool_s *mp)
 372 {
 373         m_addr_t vp;
 374         m_vtob_s *vbp;
 375 
 376         vbp = __m_calloc(&mp0, sizeof(*vbp), "VTOB");
 377         if (vbp) {
 378                 dma_addr_t daddr;
 379                 vp = (m_addr_t) dma_alloc_coherent(mp->bush,
 380                                                 PAGE_SIZE<<MEMO_PAGE_ORDER,
 381                                                 &daddr, GFP_ATOMIC);
 382                 if (vp) {
 383                         int hc = VTOB_HASH_CODE(vp);
 384                         vbp->vaddr = vp;
 385                         vbp->baddr = daddr;
 386                         vbp->next = mp->vtob[hc];
 387                         mp->vtob[hc] = vbp;
 388                         ++mp->nump;
 389                         return vp;
 390                 }
 391         }
 392         if (vbp)
 393                 __m_free(&mp0, vbp, sizeof(*vbp), "VTOB");
 394         return 0;
 395 }
 396 
 397 static void ___dma_freep(m_pool_s *mp, m_addr_t m)
 398 {
 399         m_vtob_s **vbpp, *vbp;
 400         int hc = VTOB_HASH_CODE(m);
 401 
 402         vbpp = &mp->vtob[hc];
 403         while (*vbpp && (*vbpp)->vaddr != m)
 404                 vbpp = &(*vbpp)->next;
 405         if (*vbpp) {
 406                 vbp = *vbpp;
 407                 *vbpp = (*vbpp)->next;
 408                 dma_free_coherent(mp->bush, PAGE_SIZE<<MEMO_PAGE_ORDER,
 409                                   (void *)vbp->vaddr, (dma_addr_t)vbp->baddr);
 410                 __m_free(&mp0, vbp, sizeof(*vbp), "VTOB");
 411                 --mp->nump;
 412         }
 413 }
 414 
 415 static inline m_pool_s *___get_dma_pool(m_bush_t bush)
 416 {
 417         m_pool_s *mp;
 418         for (mp = mp0.next; mp && mp->bush != bush; mp = mp->next);
 419         return mp;
 420 }
 421 
 422 static m_pool_s *___cre_dma_pool(m_bush_t bush)
 423 {
 424         m_pool_s *mp;
 425         mp = __m_calloc(&mp0, sizeof(*mp), "MPOOL");
 426         if (mp) {
 427                 memset(mp, 0, sizeof(*mp));
 428                 mp->bush = bush;
 429                 mp->getp = ___dma_getp;
 430                 mp->freep = ___dma_freep;
 431                 mp->next = mp0.next;
 432                 mp0.next = mp;
 433         }
 434         return mp;
 435 }
 436 
 437 static void ___del_dma_pool(m_pool_s *p)
 438 {
 439         struct m_pool **pp = &mp0.next;
 440 
 441         while (*pp && *pp != p)
 442                 pp = &(*pp)->next;
 443         if (*pp) {
 444                 *pp = (*pp)->next;
 445                 __m_free(&mp0, p, sizeof(*p), "MPOOL");
 446         }
 447 }
 448 
 449 static void *__m_calloc_dma(m_bush_t bush, int size, char *name)
 450 {
 451         u_long flags;
 452         struct m_pool *mp;
 453         void *m = NULL;
 454 
 455         spin_lock_irqsave(&ncr53c8xx_lock, flags);
 456         mp = ___get_dma_pool(bush);
 457         if (!mp)
 458                 mp = ___cre_dma_pool(bush);
 459         if (mp)
 460                 m = __m_calloc(mp, size, name);
 461         if (mp && !mp->nump)
 462                 ___del_dma_pool(mp);
 463         spin_unlock_irqrestore(&ncr53c8xx_lock, flags);
 464 
 465         return m;
 466 }
 467 
 468 static void __m_free_dma(m_bush_t bush, void *m, int size, char *name)
 469 {
 470         u_long flags;
 471         struct m_pool *mp;
 472 
 473         spin_lock_irqsave(&ncr53c8xx_lock, flags);
 474         mp = ___get_dma_pool(bush);
 475         if (mp)
 476                 __m_free(mp, m, size, name);
 477         if (mp && !mp->nump)
 478                 ___del_dma_pool(mp);
 479         spin_unlock_irqrestore(&ncr53c8xx_lock, flags);
 480 }
 481 
 482 static m_addr_t __vtobus(m_bush_t bush, void *m)
 483 {
 484         u_long flags;
 485         m_pool_s *mp;
 486         int hc = VTOB_HASH_CODE(m);
 487         m_vtob_s *vp = NULL;
 488         m_addr_t a = ((m_addr_t) m) & ~MEMO_CLUSTER_MASK;
 489 
 490         spin_lock_irqsave(&ncr53c8xx_lock, flags);
 491         mp = ___get_dma_pool(bush);
 492         if (mp) {
 493                 vp = mp->vtob[hc];
 494                 while (vp && (m_addr_t) vp->vaddr != a)
 495                         vp = vp->next;
 496         }
 497         spin_unlock_irqrestore(&ncr53c8xx_lock, flags);
 498         return vp ? vp->baddr + (((m_addr_t) m) - a) : 0;
 499 }
 500 
 501 #define _m_calloc_dma(np, s, n)         __m_calloc_dma(np->dev, s, n)
 502 #define _m_free_dma(np, p, s, n)        __m_free_dma(np->dev, p, s, n)
 503 #define m_calloc_dma(s, n)              _m_calloc_dma(np, s, n)
 504 #define m_free_dma(p, s, n)             _m_free_dma(np, p, s, n)
 505 #define _vtobus(np, p)                  __vtobus(np->dev, p)
 506 #define vtobus(p)                       _vtobus(np, p)
 507 
 508 /*
 509  *  Deal with DMA mapping/unmapping.
 510  */
 511 
 512 /* To keep track of the dma mapping (sg/single) that has been set */
 513 #define __data_mapped   SCp.phase
 514 #define __data_mapping  SCp.have_data_in
 515 
 516 static void __unmap_scsi_data(struct device *dev, struct scsi_cmnd *cmd)
 517 {
 518         switch(cmd->__data_mapped) {
 519         case 2:
 520                 scsi_dma_unmap(cmd);
 521                 break;
 522         }
 523         cmd->__data_mapped = 0;
 524 }
 525 
 526 static int __map_scsi_sg_data(struct device *dev, struct scsi_cmnd *cmd)
 527 {
 528         int use_sg;
 529 
 530         use_sg = scsi_dma_map(cmd);
 531         if (!use_sg)
 532                 return 0;
 533 
 534         cmd->__data_mapped = 2;
 535         cmd->__data_mapping = use_sg;
 536 
 537         return use_sg;
 538 }
 539 
 540 #define unmap_scsi_data(np, cmd)        __unmap_scsi_data(np->dev, cmd)
 541 #define map_scsi_sg_data(np, cmd)       __map_scsi_sg_data(np->dev, cmd)
 542 
 543 /*==========================================================
 544 **
 545 **      Driver setup.
 546 **
 547 **      This structure is initialized from linux config 
 548 **      options. It can be overridden at boot-up by the boot 
 549 **      command line.
 550 **
 551 **==========================================================
 552 */
 553 static struct ncr_driver_setup
 554         driver_setup                    = SCSI_NCR_DRIVER_SETUP;
 555 
 556 #ifndef MODULE
 557 #ifdef  SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
 558 static struct ncr_driver_setup
 559         driver_safe_setup __initdata    = SCSI_NCR_DRIVER_SAFE_SETUP;
 560 #endif
 561 #endif /* !MODULE */
 562 
 563 #define initverbose (driver_setup.verbose)
 564 #define bootverbose (np->verbose)
 565 
 566 
 567 /*===================================================================
 568 **
 569 **      Driver setup from the boot command line
 570 **
 571 **===================================================================
 572 */
 573 
 574 #ifdef MODULE
 575 #define ARG_SEP ' '
 576 #else
 577 #define ARG_SEP ','
 578 #endif
 579 
 580 #define OPT_TAGS                1
 581 #define OPT_MASTER_PARITY       2
 582 #define OPT_SCSI_PARITY         3
 583 #define OPT_DISCONNECTION       4
 584 #define OPT_SPECIAL_FEATURES    5
 585 #define OPT_UNUSED_1            6
 586 #define OPT_FORCE_SYNC_NEGO     7
 587 #define OPT_REVERSE_PROBE       8
 588 #define OPT_DEFAULT_SYNC        9
 589 #define OPT_VERBOSE             10
 590 #define OPT_DEBUG               11
 591 #define OPT_BURST_MAX           12
 592 #define OPT_LED_PIN             13
 593 #define OPT_MAX_WIDE            14
 594 #define OPT_SETTLE_DELAY        15
 595 #define OPT_DIFF_SUPPORT        16
 596 #define OPT_IRQM                17
 597 #define OPT_PCI_FIX_UP          18
 598 #define OPT_BUS_CHECK           19
 599 #define OPT_OPTIMIZE            20
 600 #define OPT_RECOVERY            21
 601 #define OPT_SAFE_SETUP          22
 602 #define OPT_USE_NVRAM           23
 603 #define OPT_EXCLUDE             24
 604 #define OPT_HOST_ID             25
 605 
 606 #ifdef SCSI_NCR_IARB_SUPPORT
 607 #define OPT_IARB                26
 608 #endif
 609 
 610 #ifdef MODULE
 611 #define ARG_SEP ' '
 612 #else
 613 #define ARG_SEP ','
 614 #endif
 615 
 616 #ifndef MODULE
 617 static char setup_token[] __initdata = 
 618         "tags:"   "mpar:"
 619         "spar:"   "disc:"
 620         "specf:"  "ultra:"
 621         "fsn:"    "revprob:"
 622         "sync:"   "verb:"
 623         "debug:"  "burst:"
 624         "led:"    "wide:"
 625         "settle:" "diff:"
 626         "irqm:"   "pcifix:"
 627         "buschk:" "optim:"
 628         "recovery:"
 629         "safe:"   "nvram:"
 630         "excl:"   "hostid:"
 631 #ifdef SCSI_NCR_IARB_SUPPORT
 632         "iarb:"
 633 #endif
 634         ;       /* DONNOT REMOVE THIS ';' */
 635 
 636 static int __init get_setup_token(char *p)
 637 {
 638         char *cur = setup_token;
 639         char *pc;
 640         int i = 0;
 641 
 642         while (cur != NULL && (pc = strchr(cur, ':')) != NULL) {
 643                 ++pc;
 644                 ++i;
 645                 if (!strncmp(p, cur, pc - cur))
 646                         return i;
 647                 cur = pc;
 648         }
 649         return 0;
 650 }
 651 
 652 static int __init sym53c8xx__setup(char *str)
 653 {
 654 #ifdef SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT
 655         char *cur = str;
 656         char *pc, *pv;
 657         int i, val, c;
 658         int xi = 0;
 659 
 660         while (cur != NULL && (pc = strchr(cur, ':')) != NULL) {
 661                 char *pe;
 662 
 663                 val = 0;
 664                 pv = pc;
 665                 c = *++pv;
 666 
 667                 if      (c == 'n')
 668                         val = 0;
 669                 else if (c == 'y')
 670                         val = 1;
 671                 else
 672                         val = (int) simple_strtoul(pv, &pe, 0);
 673 
 674                 switch (get_setup_token(cur)) {
 675                 case OPT_TAGS:
 676                         driver_setup.default_tags = val;
 677                         if (pe && *pe == '/') {
 678                                 i = 0;
 679                                 while (*pe && *pe != ARG_SEP && 
 680                                         i < sizeof(driver_setup.tag_ctrl)-1) {
 681                                         driver_setup.tag_ctrl[i++] = *pe++;
 682                                 }
 683                                 driver_setup.tag_ctrl[i] = '\0';
 684                         }
 685                         break;
 686                 case OPT_MASTER_PARITY:
 687                         driver_setup.master_parity = val;
 688                         break;
 689                 case OPT_SCSI_PARITY:
 690                         driver_setup.scsi_parity = val;
 691                         break;
 692                 case OPT_DISCONNECTION:
 693                         driver_setup.disconnection = val;
 694                         break;
 695                 case OPT_SPECIAL_FEATURES:
 696                         driver_setup.special_features = val;
 697                         break;
 698                 case OPT_FORCE_SYNC_NEGO:
 699                         driver_setup.force_sync_nego = val;
 700                         break;
 701                 case OPT_REVERSE_PROBE:
 702                         driver_setup.reverse_probe = val;
 703                         break;
 704                 case OPT_DEFAULT_SYNC:
 705                         driver_setup.default_sync = val;
 706                         break;
 707                 case OPT_VERBOSE:
 708                         driver_setup.verbose = val;
 709                         break;
 710                 case OPT_DEBUG:
 711                         driver_setup.debug = val;
 712                         break;
 713                 case OPT_BURST_MAX:
 714                         driver_setup.burst_max = val;
 715                         break;
 716                 case OPT_LED_PIN:
 717                         driver_setup.led_pin = val;
 718                         break;
 719                 case OPT_MAX_WIDE:
 720                         driver_setup.max_wide = val? 1:0;
 721                         break;
 722                 case OPT_SETTLE_DELAY:
 723                         driver_setup.settle_delay = val;
 724                         break;
 725                 case OPT_DIFF_SUPPORT:
 726                         driver_setup.diff_support = val;
 727                         break;
 728                 case OPT_IRQM:
 729                         driver_setup.irqm = val;
 730                         break;
 731                 case OPT_PCI_FIX_UP:
 732                         driver_setup.pci_fix_up = val;
 733                         break;
 734                 case OPT_BUS_CHECK:
 735                         driver_setup.bus_check = val;
 736                         break;
 737                 case OPT_OPTIMIZE:
 738                         driver_setup.optimize = val;
 739                         break;
 740                 case OPT_RECOVERY:
 741                         driver_setup.recovery = val;
 742                         break;
 743                 case OPT_USE_NVRAM:
 744                         driver_setup.use_nvram = val;
 745                         break;
 746                 case OPT_SAFE_SETUP:
 747                         memcpy(&driver_setup, &driver_safe_setup,
 748                                 sizeof(driver_setup));
 749                         break;
 750                 case OPT_EXCLUDE:
 751                         if (xi < SCSI_NCR_MAX_EXCLUDES)
 752                                 driver_setup.excludes[xi++] = val;
 753                         break;
 754                 case OPT_HOST_ID:
 755                         driver_setup.host_id = val;
 756                         break;
 757 #ifdef SCSI_NCR_IARB_SUPPORT
 758                 case OPT_IARB:
 759                         driver_setup.iarb = val;
 760                         break;
 761 #endif
 762                 default:
 763                         printk("sym53c8xx_setup: unexpected boot option '%.*s' ignored\n", (int)(pc-cur+1), cur);
 764                         break;
 765                 }
 766 
 767                 if ((cur = strchr(cur, ARG_SEP)) != NULL)
 768                         ++cur;
 769         }
 770 #endif /* SCSI_NCR_BOOT_COMMAND_LINE_SUPPORT */
 771         return 1;
 772 }
 773 #endif /* !MODULE */
 774 
 775 /*===================================================================
 776 **
 777 **      Get device queue depth from boot command line.
 778 **
 779 **===================================================================
 780 */
 781 #define DEF_DEPTH       (driver_setup.default_tags)
 782 #define ALL_TARGETS     -2
 783 #define NO_TARGET       -1
 784 #define ALL_LUNS        -2
 785 #define NO_LUN          -1
 786 
 787 static int device_queue_depth(int unit, int target, int lun)
 788 {
 789         int c, h, t, u, v;
 790         char *p = driver_setup.tag_ctrl;
 791         char *ep;
 792 
 793         h = -1;
 794         t = NO_TARGET;
 795         u = NO_LUN;
 796         while ((c = *p++) != 0) {
 797                 v = simple_strtoul(p, &ep, 0);
 798                 switch(c) {
 799                 case '/':
 800                         ++h;
 801                         t = ALL_TARGETS;
 802                         u = ALL_LUNS;
 803                         break;
 804                 case 't':
 805                         if (t != target)
 806                                 t = (target == v) ? v : NO_TARGET;
 807                         u = ALL_LUNS;
 808                         break;
 809                 case 'u':
 810                         if (u != lun)
 811                                 u = (lun == v) ? v : NO_LUN;
 812                         break;
 813                 case 'q':
 814                         if (h == unit &&
 815                                 (t == ALL_TARGETS || t == target) &&
 816                                 (u == ALL_LUNS    || u == lun))
 817                                 return v;
 818                         break;
 819                 case '-':
 820                         t = ALL_TARGETS;
 821                         u = ALL_LUNS;
 822                         break;
 823                 default:
 824                         break;
 825                 }
 826                 p = ep;
 827         }
 828         return DEF_DEPTH;
 829 }
 830 
 831 
 832 /*==========================================================
 833 **
 834 **      The CCB done queue uses an array of CCB virtual 
 835 **      addresses. Empty entries are flagged using the bogus 
 836 **      virtual address 0xffffffff.
 837 **
 838 **      Since PCI ensures that only aligned DWORDs are accessed 
 839 **      atomically, 64 bit little-endian architecture requires 
 840 **      to test the high order DWORD of the entry to determine 
 841 **      if it is empty or valid.
 842 **
 843 **      BTW, I will make things differently as soon as I will 
 844 **      have a better idea, but this is simple and should work.
 845 **
 846 **==========================================================
 847 */
 848  
 849 #define SCSI_NCR_CCB_DONE_SUPPORT
 850 #ifdef  SCSI_NCR_CCB_DONE_SUPPORT
 851 
 852 #define MAX_DONE 24
 853 #define CCB_DONE_EMPTY 0xffffffffUL
 854 
 855 /* All 32 bit architectures */
 856 #if BITS_PER_LONG == 32
 857 #define CCB_DONE_VALID(cp)  (((u_long) cp) != CCB_DONE_EMPTY)
 858 
 859 /* All > 32 bit (64 bit) architectures regardless endian-ness */
 860 #else
 861 #define CCB_DONE_VALID(cp)  \
 862         ((((u_long) cp) & 0xffffffff00000000ul) &&      \
 863          (((u_long) cp) & 0xfffffffful) != CCB_DONE_EMPTY)
 864 #endif
 865 
 866 #endif /* SCSI_NCR_CCB_DONE_SUPPORT */
 867 
 868 /*==========================================================
 869 **
 870 **      Configuration and Debugging
 871 **
 872 **==========================================================
 873 */
 874 
 875 /*
 876 **    SCSI address of this device.
 877 **    The boot routines should have set it.
 878 **    If not, use this.
 879 */
 880 
 881 #ifndef SCSI_NCR_MYADDR
 882 #define SCSI_NCR_MYADDR      (7)
 883 #endif
 884 
 885 /*
 886 **    The maximum number of tags per logic unit.
 887 **    Used only for disk devices that support tags.
 888 */
 889 
 890 #ifndef SCSI_NCR_MAX_TAGS
 891 #define SCSI_NCR_MAX_TAGS    (8)
 892 #endif
 893 
 894 /*
 895 **    TAGS are actually limited to 64 tags/lun.
 896 **    We need to deal with power of 2, for alignment constraints.
 897 */
 898 #if     SCSI_NCR_MAX_TAGS > 64
 899 #define MAX_TAGS (64)
 900 #else
 901 #define MAX_TAGS SCSI_NCR_MAX_TAGS
 902 #endif
 903 
 904 #define NO_TAG  (255)
 905 
 906 /*
 907 **      Choose appropriate type for tag bitmap.
 908 */
 909 #if     MAX_TAGS > 32
 910 typedef u64 tagmap_t;
 911 #else
 912 typedef u32 tagmap_t;
 913 #endif
 914 
 915 /*
 916 **    Number of targets supported by the driver.
 917 **    n permits target numbers 0..n-1.
 918 **    Default is 16, meaning targets #0..#15.
 919 **    #7 .. is myself.
 920 */
 921 
 922 #ifdef SCSI_NCR_MAX_TARGET
 923 #define MAX_TARGET  (SCSI_NCR_MAX_TARGET)
 924 #else
 925 #define MAX_TARGET  (16)
 926 #endif
 927 
 928 /*
 929 **    Number of logic units supported by the driver.
 930 **    n enables logic unit numbers 0..n-1.
 931 **    The common SCSI devices require only
 932 **    one lun, so take 1 as the default.
 933 */
 934 
 935 #ifdef SCSI_NCR_MAX_LUN
 936 #define MAX_LUN    SCSI_NCR_MAX_LUN
 937 #else
 938 #define MAX_LUN    (1)
 939 #endif
 940 
 941 /*
 942 **    Asynchronous pre-scaler (ns). Shall be 40
 943 */
 944  
 945 #ifndef SCSI_NCR_MIN_ASYNC
 946 #define SCSI_NCR_MIN_ASYNC (40)
 947 #endif
 948 
 949 /*
 950 **    The maximum number of jobs scheduled for starting.
 951 **    There should be one slot per target, and one slot
 952 **    for each tag of each target in use.
 953 **    The calculation below is actually quite silly ...
 954 */
 955 
 956 #ifdef SCSI_NCR_CAN_QUEUE
 957 #define MAX_START   (SCSI_NCR_CAN_QUEUE + 4)
 958 #else
 959 #define MAX_START   (MAX_TARGET + 7 * MAX_TAGS)
 960 #endif
 961 
 962 /*
 963 **   We limit the max number of pending IO to 250.
 964 **   since we donnot want to allocate more than 1 
 965 **   PAGE for 'scripth'.
 966 */
 967 #if     MAX_START > 250
 968 #undef  MAX_START
 969 #define MAX_START 250
 970 #endif
 971 
 972 /*
 973 **    The maximum number of segments a transfer is split into.
 974 **    We support up to 127 segments for both read and write.
 975 **    The data scripts are broken into 2 sub-scripts.
 976 **    80 (MAX_SCATTERL) segments are moved from a sub-script
 977 **    in on-chip RAM. This makes data transfers shorter than 
 978 **    80k (assuming 1k fs) as fast as possible.
 979 */
 980 
 981 #define MAX_SCATTER (SCSI_NCR_MAX_SCATTER)
 982 
 983 #if (MAX_SCATTER > 80)
 984 #define MAX_SCATTERL    80
 985 #define MAX_SCATTERH    (MAX_SCATTER - MAX_SCATTERL)
 986 #else
 987 #define MAX_SCATTERL    (MAX_SCATTER-1)
 988 #define MAX_SCATTERH    1
 989 #endif
 990 
 991 /*
 992 **      other
 993 */
 994 
 995 #define NCR_SNOOP_TIMEOUT (1000000)
 996 
 997 /*
 998 **      Other definitions
 999 */
1000 
1001 #define ScsiResult(host_code, scsi_code) (((host_code) << 16) + ((scsi_code) & 0x7f))
1002 
1003 #define initverbose (driver_setup.verbose)
1004 #define bootverbose (np->verbose)
1005 
1006 /*==========================================================
1007 **
1008 **      Command control block states.
1009 **
1010 **==========================================================
1011 */
1012 
1013 #define HS_IDLE         (0)
1014 #define HS_BUSY         (1)
1015 #define HS_NEGOTIATE    (2)     /* sync/wide data transfer*/
1016 #define HS_DISCONNECT   (3)     /* Disconnected by target */
1017 
1018 #define HS_DONEMASK     (0x80)
1019 #define HS_COMPLETE     (4|HS_DONEMASK)
1020 #define HS_SEL_TIMEOUT  (5|HS_DONEMASK) /* Selection timeout      */
1021 #define HS_RESET        (6|HS_DONEMASK) /* SCSI reset             */
1022 #define HS_ABORTED      (7|HS_DONEMASK) /* Transfer aborted       */
1023 #define HS_TIMEOUT      (8|HS_DONEMASK) /* Software timeout       */
1024 #define HS_FAIL         (9|HS_DONEMASK) /* SCSI or PCI bus errors */
1025 #define HS_UNEXPECTED   (10|HS_DONEMASK)/* Unexpected disconnect  */
1026 
1027 /*
1028 **      Invalid host status values used by the SCRIPTS processor 
1029 **      when the nexus is not fully identified.
1030 **      Shall never appear in a CCB.
1031 */
1032 
1033 #define HS_INVALMASK    (0x40)
1034 #define HS_SELECTING    (0|HS_INVALMASK)
1035 #define HS_IN_RESELECT  (1|HS_INVALMASK)
1036 #define HS_STARTING     (2|HS_INVALMASK)
1037 
1038 /*
1039 **      Flags set by the SCRIPT processor for commands 
1040 **      that have been skipped.
1041 */
1042 #define HS_SKIPMASK     (0x20)
1043 
1044 /*==========================================================
1045 **
1046 **      Software Interrupt Codes
1047 **
1048 **==========================================================
1049 */
1050 
1051 #define SIR_BAD_STATUS          (1)
1052 #define SIR_XXXXXXXXXX          (2)
1053 #define SIR_NEGO_SYNC           (3)
1054 #define SIR_NEGO_WIDE           (4)
1055 #define SIR_NEGO_FAILED         (5)
1056 #define SIR_NEGO_PROTO          (6)
1057 #define SIR_REJECT_RECEIVED     (7)
1058 #define SIR_REJECT_SENT         (8)
1059 #define SIR_IGN_RESIDUE         (9)
1060 #define SIR_MISSING_SAVE        (10)
1061 #define SIR_RESEL_NO_MSG_IN     (11)
1062 #define SIR_RESEL_NO_IDENTIFY   (12)
1063 #define SIR_RESEL_BAD_LUN       (13)
1064 #define SIR_RESEL_BAD_TARGET    (14)
1065 #define SIR_RESEL_BAD_I_T_L     (15)
1066 #define SIR_RESEL_BAD_I_T_L_Q   (16)
1067 #define SIR_DONE_OVERFLOW       (17)
1068 #define SIR_INTFLY              (18)
1069 #define SIR_MAX                 (18)
1070 
1071 /*==========================================================
1072 **
1073 **      Extended error codes.
1074 **      xerr_status field of struct ccb.
1075 **
1076 **==========================================================
1077 */
1078 
1079 #define XE_OK           (0)
1080 #define XE_EXTRA_DATA   (1)     /* unexpected data phase */
1081 #define XE_BAD_PHASE    (2)     /* illegal phase (4/5)   */
1082 
1083 /*==========================================================
1084 **
1085 **      Negotiation status.
1086 **      nego_status field       of struct ccb.
1087 **
1088 **==========================================================
1089 */
1090 
1091 #define NS_NOCHANGE     (0)
1092 #define NS_SYNC         (1)
1093 #define NS_WIDE         (2)
1094 #define NS_PPR          (4)
1095 
1096 /*==========================================================
1097 **
1098 **      Misc.
1099 **
1100 **==========================================================
1101 */
1102 
1103 #define CCB_MAGIC       (0xf2691ad2)
1104 
1105 /*==========================================================
1106 **
1107 **      Declaration of structs.
1108 **
1109 **==========================================================
1110 */
1111 
1112 static struct scsi_transport_template *ncr53c8xx_transport_template = NULL;
1113 
1114 struct tcb;
1115 struct lcb;
1116 struct ccb;
1117 struct ncb;
1118 struct script;
1119 
1120 struct link {
1121         ncrcmd  l_cmd;
1122         ncrcmd  l_paddr;
1123 };
1124 
1125 struct  usrcmd {
1126         u_long  target;
1127         u_long  lun;
1128         u_long  data;
1129         u_long  cmd;
1130 };
1131 
1132 #define UC_SETSYNC      10
1133 #define UC_SETTAGS      11
1134 #define UC_SETDEBUG     12
1135 #define UC_SETORDER     13
1136 #define UC_SETWIDE      14
1137 #define UC_SETFLAG      15
1138 #define UC_SETVERBOSE   17
1139 
1140 #define UF_TRACE        (0x01)
1141 #define UF_NODISC       (0x02)
1142 #define UF_NOSCAN       (0x04)
1143 
1144 /*========================================================================
1145 **
1146 **      Declaration of structs:         target control block
1147 **
1148 **========================================================================
1149 */
1150 struct tcb {
1151         /*----------------------------------------------------------------
1152         **      During reselection the ncr jumps to this point with SFBR 
1153         **      set to the encoded target number with bit 7 set.
1154         **      if it's not this target, jump to the next.
1155         **
1156         **      JUMP  IF (SFBR != #target#), @(next tcb)
1157         **----------------------------------------------------------------
1158         */
1159         struct link   jump_tcb;
1160 
1161         /*----------------------------------------------------------------
1162         **      Load the actual values for the sxfer and the scntl3
1163         **      register (sync/wide mode).
1164         **
1165         **      SCR_COPY (1), @(sval field of this tcb), @(sxfer  register)
1166         **      SCR_COPY (1), @(wval field of this tcb), @(scntl3 register)
1167         **----------------------------------------------------------------
1168         */
1169         ncrcmd  getscr[6];
1170 
1171         /*----------------------------------------------------------------
1172         **      Get the IDENTIFY message and load the LUN to SFBR.
1173         **
1174         **      CALL, <RESEL_LUN>
1175         **----------------------------------------------------------------
1176         */
1177         struct link   call_lun;
1178 
1179         /*----------------------------------------------------------------
1180         **      Now look for the right lun.
1181         **
1182         **      For i = 0 to 3
1183         **              SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(first lcb mod. i)
1184         **
1185         **      Recent chips will prefetch the 4 JUMPS using only 1 burst.
1186         **      It is kind of hashcoding.
1187         **----------------------------------------------------------------
1188         */
1189         struct link     jump_lcb[4];    /* JUMPs for reselection        */
1190         struct lcb *    lp[MAX_LUN];    /* The lcb's of this tcb        */
1191 
1192         /*----------------------------------------------------------------
1193         **      Pointer to the ccb used for negotiation.
1194         **      Prevent from starting a negotiation for all queued commands 
1195         **      when tagged command queuing is enabled.
1196         **----------------------------------------------------------------
1197         */
1198         struct ccb *   nego_cp;
1199 
1200         /*----------------------------------------------------------------
1201         **      statistical data
1202         **----------------------------------------------------------------
1203         */
1204         u_long  transfers;
1205         u_long  bytes;
1206 
1207         /*----------------------------------------------------------------
1208         **      negotiation of wide and synch transfer and device quirks.
1209         **----------------------------------------------------------------
1210         */
1211 #ifdef SCSI_NCR_BIG_ENDIAN
1212 /*0*/   u16     period;
1213 /*2*/   u_char  sval;
1214 /*3*/   u_char  minsync;
1215 /*0*/   u_char  wval;
1216 /*1*/   u_char  widedone;
1217 /*2*/   u_char  quirks;
1218 /*3*/   u_char  maxoffs;
1219 #else
1220 /*0*/   u_char  minsync;
1221 /*1*/   u_char  sval;
1222 /*2*/   u16     period;
1223 /*0*/   u_char  maxoffs;
1224 /*1*/   u_char  quirks;
1225 /*2*/   u_char  widedone;
1226 /*3*/   u_char  wval;
1227 #endif
1228 
1229         /* User settable limits and options.  */
1230         u_char  usrsync;
1231         u_char  usrwide;
1232         u_char  usrtags;
1233         u_char  usrflag;
1234         struct scsi_target *starget;
1235 };
1236 
1237 /*========================================================================
1238 **
1239 **      Declaration of structs:         lun control block
1240 **
1241 **========================================================================
1242 */
1243 struct lcb {
1244         /*----------------------------------------------------------------
1245         **      During reselection the ncr jumps to this point
1246         **      with SFBR set to the "Identify" message.
1247         **      if it's not this lun, jump to the next.
1248         **
1249         **      JUMP  IF (SFBR != #lun#), @(next lcb of this target)
1250         **
1251         **      It is this lun. Load TEMP with the nexus jumps table 
1252         **      address and jump to RESEL_TAG (or RESEL_NOTAG).
1253         **
1254         **              SCR_COPY (4), p_jump_ccb, TEMP,
1255         **              SCR_JUMP, <RESEL_TAG>
1256         **----------------------------------------------------------------
1257         */
1258         struct link     jump_lcb;
1259         ncrcmd          load_jump_ccb[3];
1260         struct link     jump_tag;
1261         ncrcmd          p_jump_ccb;     /* Jump table bus address       */
1262 
1263         /*----------------------------------------------------------------
1264         **      Jump table used by the script processor to directly jump 
1265         **      to the CCB corresponding to the reselected nexus.
1266         **      Address is allocated on 256 bytes boundary in order to 
1267         **      allow 8 bit calculation of the tag jump entry for up to 
1268         **      64 possible tags.
1269         **----------------------------------------------------------------
1270         */
1271         u32             jump_ccb_0;     /* Default table if no tags     */
1272         u32             *jump_ccb;      /* Virtual address              */
1273 
1274         /*----------------------------------------------------------------
1275         **      CCB queue management.
1276         **----------------------------------------------------------------
1277         */
1278         struct list_head free_ccbq;     /* Queue of available CCBs      */
1279         struct list_head busy_ccbq;     /* Queue of busy CCBs           */
1280         struct list_head wait_ccbq;     /* Queue of waiting for IO CCBs */
1281         struct list_head skip_ccbq;     /* Queue of skipped CCBs        */
1282         u_char          actccbs;        /* Number of allocated CCBs     */
1283         u_char          busyccbs;       /* CCBs busy for this lun       */
1284         u_char          queuedccbs;     /* CCBs queued to the controller*/
1285         u_char          queuedepth;     /* Queue depth for this lun     */
1286         u_char          scdev_depth;    /* SCSI device queue depth      */
1287         u_char          maxnxs;         /* Max possible nexuses         */
1288 
1289         /*----------------------------------------------------------------
1290         **      Control of tagged command queuing.
1291         **      Tags allocation is performed using a circular buffer.
1292         **      This avoids using a loop for tag allocation.
1293         **----------------------------------------------------------------
1294         */
1295         u_char          ia_tag;         /* Allocation index             */
1296         u_char          if_tag;         /* Freeing index                */
1297         u_char cb_tags[MAX_TAGS];       /* Circular tags buffer */
1298         u_char          usetags;        /* Command queuing is active    */
1299         u_char          maxtags;        /* Max nr of tags asked by user */
1300         u_char          numtags;        /* Current number of tags       */
1301 
1302         /*----------------------------------------------------------------
1303         **      QUEUE FULL control and ORDERED tag control.
1304         **----------------------------------------------------------------
1305         */
1306         /*----------------------------------------------------------------
1307         **      QUEUE FULL and ORDERED tag control.
1308         **----------------------------------------------------------------
1309         */
1310         u16             num_good;       /* Nr of GOOD since QUEUE FULL  */
1311         tagmap_t        tags_umap;      /* Used tags bitmap             */
1312         tagmap_t        tags_smap;      /* Tags in use at 'tag_stime'   */
1313         u_long          tags_stime;     /* Last time we set smap=umap   */
1314         struct ccb *    held_ccb;       /* CCB held for QUEUE FULL      */
1315 };
1316 
1317 /*========================================================================
1318 **
1319 **      Declaration of structs:     the launch script.
1320 **
1321 **========================================================================
1322 **
1323 **      It is part of the CCB and is called by the scripts processor to 
1324 **      start or restart the data structure (nexus).
1325 **      This 6 DWORDs mini script makes use of prefetching.
1326 **
1327 **------------------------------------------------------------------------
1328 */
1329 struct launch {
1330         /*----------------------------------------------------------------
1331         **      SCR_COPY(4),    @(p_phys), @(dsa register)
1332         **      SCR_JUMP,       @(scheduler_point)
1333         **----------------------------------------------------------------
1334         */
1335         ncrcmd          setup_dsa[3];   /* Copy 'phys' address to dsa   */
1336         struct link     schedule;       /* Jump to scheduler point      */
1337         ncrcmd          p_phys;         /* 'phys' header bus address    */
1338 };
1339 
1340 /*========================================================================
1341 **
1342 **      Declaration of structs:     global HEADER.
1343 **
1344 **========================================================================
1345 **
1346 **      This substructure is copied from the ccb to a global address after 
1347 **      selection (or reselection) and copied back before disconnect.
1348 **
1349 **      These fields are accessible to the script processor.
1350 **
1351 **------------------------------------------------------------------------
1352 */
1353 
1354 struct head {
1355         /*----------------------------------------------------------------
1356         **      Saved data pointer.
1357         **      Points to the position in the script responsible for the
1358         **      actual transfer transfer of data.
1359         **      It's written after reception of a SAVE_DATA_POINTER message.
1360         **      The goalpointer points after the last transfer command.
1361         **----------------------------------------------------------------
1362         */
1363         u32             savep;
1364         u32             lastp;
1365         u32             goalp;
1366 
1367         /*----------------------------------------------------------------
1368         **      Alternate data pointer.
1369         **      They are copied back to savep/lastp/goalp by the SCRIPTS 
1370         **      when the direction is unknown and the device claims data out.
1371         **----------------------------------------------------------------
1372         */
1373         u32             wlastp;
1374         u32             wgoalp;
1375 
1376         /*----------------------------------------------------------------
1377         **      The virtual address of the ccb containing this header.
1378         **----------------------------------------------------------------
1379         */
1380         struct ccb *    cp;
1381 
1382         /*----------------------------------------------------------------
1383         **      Status fields.
1384         **----------------------------------------------------------------
1385         */
1386         u_char          scr_st[4];      /* script status                */
1387         u_char          status[4];      /* host status. must be the     */
1388                                         /*  last DWORD of the header.   */
1389 };
1390 
1391 /*
1392 **      The status bytes are used by the host and the script processor.
1393 **
1394 **      The byte corresponding to the host_status must be stored in the 
1395 **      last DWORD of the CCB header since it is used for command 
1396 **      completion (ncr_wakeup()). Doing so, we are sure that the header 
1397 **      has been entirely copied back to the CCB when the host_status is 
1398 **      seen complete by the CPU.
1399 **
1400 **      The last four bytes (status[4]) are copied to the scratchb register
1401 **      (declared as scr0..scr3 in ncr_reg.h) just after the select/reselect,
1402 **      and copied back just after disconnecting.
1403 **      Inside the script the XX_REG are used.
1404 **
1405 **      The first four bytes (scr_st[4]) are used inside the script by 
1406 **      "COPY" commands.
1407 **      Because source and destination must have the same alignment
1408 **      in a DWORD, the fields HAVE to be at the chosen offsets.
1409 **              xerr_st         0       (0x34)  scratcha
1410 **              sync_st         1       (0x05)  sxfer
1411 **              wide_st         3       (0x03)  scntl3
1412 */
1413 
1414 /*
1415 **      Last four bytes (script)
1416 */
1417 #define  QU_REG scr0
1418 #define  HS_REG scr1
1419 #define  HS_PRT nc_scr1
1420 #define  SS_REG scr2
1421 #define  SS_PRT nc_scr2
1422 #define  PS_REG scr3
1423 
1424 /*
1425 **      Last four bytes (host)
1426 */
1427 #ifdef SCSI_NCR_BIG_ENDIAN
1428 #define  actualquirks  phys.header.status[3]
1429 #define  host_status   phys.header.status[2]
1430 #define  scsi_status   phys.header.status[1]
1431 #define  parity_status phys.header.status[0]
1432 #else
1433 #define  actualquirks  phys.header.status[0]
1434 #define  host_status   phys.header.status[1]
1435 #define  scsi_status   phys.header.status[2]
1436 #define  parity_status phys.header.status[3]
1437 #endif
1438 
1439 /*
1440 **      First four bytes (script)
1441 */
1442 #define  xerr_st       header.scr_st[0]
1443 #define  sync_st       header.scr_st[1]
1444 #define  nego_st       header.scr_st[2]
1445 #define  wide_st       header.scr_st[3]
1446 
1447 /*
1448 **      First four bytes (host)
1449 */
1450 #define  xerr_status   phys.xerr_st
1451 #define  nego_status   phys.nego_st
1452 
1453 #if 0
1454 #define  sync_status   phys.sync_st
1455 #define  wide_status   phys.wide_st
1456 #endif
1457 
1458 /*==========================================================
1459 **
1460 **      Declaration of structs:     Data structure block
1461 **
1462 **==========================================================
1463 **
1464 **      During execution of a ccb by the script processor,
1465 **      the DSA (data structure address) register points
1466 **      to this substructure of the ccb.
1467 **      This substructure contains the header with
1468 **      the script-processor-changeable data and
1469 **      data blocks for the indirect move commands.
1470 **
1471 **----------------------------------------------------------
1472 */
1473 
1474 struct dsb {
1475 
1476         /*
1477         **      Header.
1478         */
1479 
1480         struct head     header;
1481 
1482         /*
1483         **      Table data for Script
1484         */
1485 
1486         struct scr_tblsel  select;
1487         struct scr_tblmove smsg  ;
1488         struct scr_tblmove cmd   ;
1489         struct scr_tblmove sense ;
1490         struct scr_tblmove data[MAX_SCATTER];
1491 };
1492 
1493 
1494 /*========================================================================
1495 **
1496 **      Declaration of structs:     Command control block.
1497 **
1498 **========================================================================
1499 */
1500 struct ccb {
1501         /*----------------------------------------------------------------
1502         **      This is the data structure which is pointed by the DSA 
1503         **      register when it is executed by the script processor.
1504         **      It must be the first entry because it contains the header 
1505         **      as first entry that must be cache line aligned.
1506         **----------------------------------------------------------------
1507         */
1508         struct dsb      phys;
1509 
1510         /*----------------------------------------------------------------
1511         **      Mini-script used at CCB execution start-up.
1512         **      Load the DSA with the data structure address (phys) and 
1513         **      jump to SELECT. Jump to CANCEL if CCB is to be canceled.
1514         **----------------------------------------------------------------
1515         */
1516         struct launch   start;
1517 
1518         /*----------------------------------------------------------------
1519         **      Mini-script used at CCB relection to restart the nexus.
1520         **      Load the DSA with the data structure address (phys) and 
1521         **      jump to RESEL_DSA. Jump to ABORT if CCB is to be aborted.
1522         **----------------------------------------------------------------
1523         */
1524         struct launch   restart;
1525 
1526         /*----------------------------------------------------------------
1527         **      If a data transfer phase is terminated too early
1528         **      (after reception of a message (i.e. DISCONNECT)),
1529         **      we have to prepare a mini script to transfer
1530         **      the rest of the data.
1531         **----------------------------------------------------------------
1532         */
1533         ncrcmd          patch[8];
1534 
1535         /*----------------------------------------------------------------
1536         **      The general SCSI driver provides a
1537         **      pointer to a control block.
1538         **----------------------------------------------------------------
1539         */
1540         struct scsi_cmnd        *cmd;           /* SCSI command                 */
1541         u_char          cdb_buf[16];    /* Copy of CDB                  */
1542         u_char          sense_buf[64];
1543         int             data_len;       /* Total data length            */
1544 
1545         /*----------------------------------------------------------------
1546         **      Message areas.
1547         **      We prepare a message to be sent after selection.
1548         **      We may use a second one if the command is rescheduled 
1549         **      due to GETCC or QFULL.
1550         **      Contents are IDENTIFY and SIMPLE_TAG.
1551         **      While negotiating sync or wide transfer,
1552         **      a SDTR or WDTR message is appended.
1553         **----------------------------------------------------------------
1554         */
1555         u_char          scsi_smsg [8];
1556         u_char          scsi_smsg2[8];
1557 
1558         /*----------------------------------------------------------------
1559         **      Other fields.
1560         **----------------------------------------------------------------
1561         */
1562         u_long          p_ccb;          /* BUS address of this CCB      */
1563         u_char          sensecmd[6];    /* Sense command                */
1564         u_char          tag;            /* Tag for this transfer        */
1565                                         /*  255 means no tag            */
1566         u_char          target;
1567         u_char          lun;
1568         u_char          queued;
1569         u_char          auto_sense;
1570         struct ccb *    link_ccb;       /* Host adapter CCB chain       */
1571         struct list_head link_ccbq;     /* Link to unit CCB queue       */
1572         u32             startp;         /* Initial data pointer         */
1573         u_long          magic;          /* Free / busy  CCB flag        */
1574 };
1575 
1576 #define CCB_PHYS(cp,lbl)        (cp->p_ccb + offsetof(struct ccb, lbl))
1577 
1578 
1579 /*========================================================================
1580 **
1581 **      Declaration of structs:     NCR device descriptor
1582 **
1583 **========================================================================
1584 */
1585 struct ncb {
1586         /*----------------------------------------------------------------
1587         **      The global header.
1588         **      It is accessible to both the host and the script processor.
1589         **      Must be cache line size aligned (32 for x86) in order to 
1590         **      allow cache line bursting when it is copied to/from CCB.
1591         **----------------------------------------------------------------
1592         */
1593         struct head     header;
1594 
1595         /*----------------------------------------------------------------
1596         **      CCBs management queues.
1597         **----------------------------------------------------------------
1598         */
1599         struct scsi_cmnd        *waiting_list;  /* Commands waiting for a CCB   */
1600                                         /*  when lcb is not allocated.  */
1601         struct scsi_cmnd        *done_list;     /* Commands waiting for done()  */
1602                                         /* callback to be invoked.      */ 
1603         spinlock_t      smp_lock;       /* Lock for SMP threading       */
1604 
1605         /*----------------------------------------------------------------
1606         **      Chip and controller identification.
1607         **----------------------------------------------------------------
1608         */
1609         int             unit;           /* Unit number                  */
1610         char            inst_name[16];  /* ncb instance name            */
1611 
1612         /*----------------------------------------------------------------
1613         **      Initial value of some IO register bits.
1614         **      These values are assumed to have been set by BIOS, and may 
1615         **      be used for probing adapter implementation differences.
1616         **----------------------------------------------------------------
1617         */
1618         u_char  sv_scntl0, sv_scntl3, sv_dmode, sv_dcntl, sv_ctest0, sv_ctest3,
1619                 sv_ctest4, sv_ctest5, sv_gpcntl, sv_stest2, sv_stest4;
1620 
1621         /*----------------------------------------------------------------
1622         **      Actual initial value of IO register bits used by the 
1623         **      driver. They are loaded at initialisation according to  
1624         **      features that are to be enabled.
1625         **----------------------------------------------------------------
1626         */
1627         u_char  rv_scntl0, rv_scntl3, rv_dmode, rv_dcntl, rv_ctest0, rv_ctest3,
1628                 rv_ctest4, rv_ctest5, rv_stest2;
1629 
1630         /*----------------------------------------------------------------
1631         **      Targets management.
1632         **      During reselection the ncr jumps to jump_tcb.
1633         **      The SFBR register is loaded with the encoded target id.
1634         **      For i = 0 to 3
1635         **              SCR_JUMP ^ IFTRUE(MASK(i, 3)), @(next tcb mod. i)
1636         **
1637         **      Recent chips will prefetch the 4 JUMPS using only 1 burst.
1638         **      It is kind of hashcoding.
1639         **----------------------------------------------------------------
1640         */
1641         struct link     jump_tcb[4];    /* JUMPs for reselection        */
1642         struct tcb  target[MAX_TARGET]; /* Target data                  */
1643 
1644         /*----------------------------------------------------------------
1645         **      Virtual and physical bus addresses of the chip.
1646         **----------------------------------------------------------------
1647         */
1648         void __iomem *vaddr;            /* Virtual and bus address of   */
1649         unsigned long   paddr;          /*  chip's IO registers.        */
1650         unsigned long   paddr2;         /* On-chip RAM bus address.     */
1651         volatile                        /* Pointer to volatile for      */
1652         struct ncr_reg  __iomem *reg;   /*  memory mapped IO.           */
1653 
1654         /*----------------------------------------------------------------
1655         **      SCRIPTS virtual and physical bus addresses.
1656         **      'script'  is loaded in the on-chip RAM if present.
1657         **      'scripth' stays in main memory.
1658         **----------------------------------------------------------------
1659         */
1660         struct script   *script0;       /* Copies of script and scripth */
1661         struct scripth  *scripth0;      /*  relocated for this ncb.     */
1662         struct scripth  *scripth;       /* Actual scripth virt. address */
1663         u_long          p_script;       /* Actual script and scripth    */
1664         u_long          p_scripth;      /*  bus addresses.              */
1665 
1666         /*----------------------------------------------------------------
1667         **      General controller parameters and configuration.
1668         **----------------------------------------------------------------
1669         */
1670         struct device   *dev;
1671         u_char          revision_id;    /* PCI device revision id       */
1672         u32             irq;            /* IRQ level                    */
1673         u32             features;       /* Chip features map            */
1674         u_char          myaddr;         /* SCSI id of the adapter       */
1675         u_char          maxburst;       /* log base 2 of dwords burst   */
1676         u_char          maxwide;        /* Maximum transfer width       */
1677         u_char          minsync;        /* Minimum sync period factor   */
1678         u_char          maxsync;        /* Maximum sync period factor   */
1679         u_char          maxoffs;        /* Max scsi offset              */
1680         u_char          multiplier;     /* Clock multiplier (1,2,4)     */
1681         u_char          clock_divn;     /* Number of clock divisors     */
1682         u_long          clock_khz;      /* SCSI clock frequency in KHz  */
1683 
1684         /*----------------------------------------------------------------
1685         **      Start queue management.
1686         **      It is filled up by the host processor and accessed by the 
1687         **      SCRIPTS processor in order to start SCSI commands.
1688         **----------------------------------------------------------------
1689         */
1690         u16             squeueput;      /* Next free slot of the queue  */
1691         u16             actccbs;        /* Number of allocated CCBs     */
1692         u16             queuedccbs;     /* Number of CCBs in start queue*/
1693         u16             queuedepth;     /* Start queue depth            */
1694 
1695         /*----------------------------------------------------------------
1696         **      Timeout handler.
1697         **----------------------------------------------------------------
1698         */
1699         struct timer_list timer;        /* Timer handler link header    */
1700         u_long          lasttime;
1701         u_long          settle_time;    /* Resetting the SCSI BUS       */
1702 
1703         /*----------------------------------------------------------------
1704         **      Debugging and profiling.
1705         **----------------------------------------------------------------
1706         */
1707         struct ncr_reg  regdump;        /* Register dump                */
1708         u_long          regtime;        /* Time it has been done        */
1709 
1710         /*----------------------------------------------------------------
1711         **      Miscellaneous buffers accessed by the scripts-processor.
1712         **      They shall be DWORD aligned, because they may be read or 
1713         **      written with a SCR_COPY script command.
1714         **----------------------------------------------------------------
1715         */
1716         u_char          msgout[8];      /* Buffer for MESSAGE OUT       */
1717         u_char          msgin [8];      /* Buffer for MESSAGE IN        */
1718         u32             lastmsg;        /* Last SCSI message sent       */
1719         u_char          scratch;        /* Scratch for SCSI receive     */
1720 
1721         /*----------------------------------------------------------------
1722         **      Miscellaneous configuration and status parameters.
1723         **----------------------------------------------------------------
1724         */
1725         u_char          disc;           /* Diconnection allowed         */
1726         u_char          scsi_mode;      /* Current SCSI BUS mode        */
1727         u_char          order;          /* Tag order to use             */
1728         u_char          verbose;        /* Verbosity for this controller*/
1729         int             ncr_cache;      /* Used for cache test at init. */
1730         u_long          p_ncb;          /* BUS address of this NCB      */
1731 
1732         /*----------------------------------------------------------------
1733         **      Command completion handling.
1734         **----------------------------------------------------------------
1735         */
1736 #ifdef SCSI_NCR_CCB_DONE_SUPPORT
1737         struct ccb      *(ccb_done[MAX_DONE]);
1738         int             ccb_done_ic;
1739 #endif
1740         /*----------------------------------------------------------------
1741         **      Fields that should be removed or changed.
1742         **----------------------------------------------------------------
1743         */
1744         struct ccb      *ccb;           /* Global CCB                   */
1745         struct usrcmd   user;           /* Command from user            */
1746         volatile u_char release_stage;  /* Synchronisation stage on release  */
1747 };
1748 
1749 #define NCB_SCRIPT_PHYS(np,lbl)  (np->p_script  + offsetof (struct script, lbl))
1750 #define NCB_SCRIPTH_PHYS(np,lbl) (np->p_scripth + offsetof (struct scripth,lbl))
1751 
1752 /*==========================================================
1753 **
1754 **
1755 **      Script for NCR-Processor.
1756 **
1757 **      Use ncr_script_fill() to create the variable parts.
1758 **      Use ncr_script_copy_and_bind() to make a copy and
1759 **      bind to physical addresses.
1760 **
1761 **
1762 **==========================================================
1763 **
1764 **      We have to know the offsets of all labels before
1765 **      we reach them (for forward jumps).
1766 **      Therefore we declare a struct here.
1767 **      If you make changes inside the script,
1768 **      DONT FORGET TO CHANGE THE LENGTHS HERE!
1769 **
1770 **----------------------------------------------------------
1771 */
1772 
1773 /*
1774 **      For HP Zalon/53c720 systems, the Zalon interface
1775 **      between CPU and 53c720 does prefetches, which causes
1776 **      problems with self modifying scripts.  The problem
1777 **      is overcome by calling a dummy subroutine after each
1778 **      modification, to force a refetch of the script on
1779 **      return from the subroutine.
1780 */
1781 
1782 #ifdef CONFIG_NCR53C8XX_PREFETCH
1783 #define PREFETCH_FLUSH_CNT      2
1784 #define PREFETCH_FLUSH          SCR_CALL, PADDRH (wait_dma),
1785 #else
1786 #define PREFETCH_FLUSH_CNT      0
1787 #define PREFETCH_FLUSH
1788 #endif
1789 
1790 /*
1791 **      Script fragments which are loaded into the on-chip RAM 
1792 **      of 825A, 875 and 895 chips.
1793 */
1794 struct script {
1795         ncrcmd  start           [  5];
1796         ncrcmd  startpos        [  1];
1797         ncrcmd  select          [  6];
1798         ncrcmd  select2         [  9 + PREFETCH_FLUSH_CNT];
1799         ncrcmd  loadpos         [  4];
1800         ncrcmd  send_ident      [  9];
1801         ncrcmd  prepare         [  6];
1802         ncrcmd  prepare2        [  7];
1803         ncrcmd  command         [  6];
1804         ncrcmd  dispatch        [ 32];
1805         ncrcmd  clrack          [  4];
1806         ncrcmd  no_data         [ 17];
1807         ncrcmd  status          [  8];
1808         ncrcmd  msg_in          [  2];
1809         ncrcmd  msg_in2         [ 16];
1810         ncrcmd  msg_bad         [  4];
1811         ncrcmd  setmsg          [  7];
1812         ncrcmd  cleanup         [  6];
1813         ncrcmd  complete        [  9];
1814         ncrcmd  cleanup_ok      [  8 + PREFETCH_FLUSH_CNT];
1815         ncrcmd  cleanup0        [  1];
1816 #ifndef SCSI_NCR_CCB_DONE_SUPPORT
1817         ncrcmd  signal          [ 12];
1818 #else
1819         ncrcmd  signal          [  9];
1820         ncrcmd  done_pos        [  1];
1821         ncrcmd  done_plug       [  2];
1822         ncrcmd  done_end        [  7];
1823 #endif
1824         ncrcmd  save_dp         [  7];
1825         ncrcmd  restore_dp      [  5];
1826         ncrcmd  disconnect      [ 10];
1827         ncrcmd  msg_out         [  9];
1828         ncrcmd  msg_out_done    [  7];
1829         ncrcmd  idle            [  2];
1830         ncrcmd  reselect        [  8];
1831         ncrcmd  reselected      [  8];
1832         ncrcmd  resel_dsa       [  6 + PREFETCH_FLUSH_CNT];
1833         ncrcmd  loadpos1        [  4];
1834         ncrcmd  resel_lun       [  6];
1835         ncrcmd  resel_tag       [  6];
1836         ncrcmd  jump_to_nexus   [  4 + PREFETCH_FLUSH_CNT];
1837         ncrcmd  nexus_indirect  [  4];
1838         ncrcmd  resel_notag     [  4];
1839         ncrcmd  data_in         [MAX_SCATTERL * 4];
1840         ncrcmd  data_in2        [  4];
1841         ncrcmd  data_out        [MAX_SCATTERL * 4];
1842         ncrcmd  data_out2       [  4];
1843 };
1844 
1845 /*
1846 **      Script fragments which stay in main memory for all chips.
1847 */
1848 struct scripth {
1849         ncrcmd  tryloop         [MAX_START*2];
1850         ncrcmd  tryloop2        [  2];
1851 #ifdef SCSI_NCR_CCB_DONE_SUPPORT
1852         ncrcmd  done_queue      [MAX_DONE*5];
1853         ncrcmd  done_queue2     [  2];
1854 #endif
1855         ncrcmd  select_no_atn   [  8];
1856         ncrcmd  cancel          [  4];
1857         ncrcmd  skip            [  9 + PREFETCH_FLUSH_CNT];
1858         ncrcmd  skip2           [ 19];
1859         ncrcmd  par_err_data_in [  6];
1860         ncrcmd  par_err_other   [  4];
1861         ncrcmd  msg_reject      [  8];
1862         ncrcmd  msg_ign_residue [ 24];
1863         ncrcmd  msg_extended    [ 10];
1864         ncrcmd  msg_ext_2       [ 10];
1865         ncrcmd  msg_wdtr        [ 14];
1866         ncrcmd  send_wdtr       [  7];
1867         ncrcmd  msg_ext_3       [ 10];
1868         ncrcmd  msg_sdtr        [ 14];
1869         ncrcmd  send_sdtr       [  7];
1870         ncrcmd  nego_bad_phase  [  4];
1871         ncrcmd  msg_out_abort   [ 10];
1872         ncrcmd  hdata_in        [MAX_SCATTERH * 4];
1873         ncrcmd  hdata_in2       [  2];
1874         ncrcmd  hdata_out       [MAX_SCATTERH * 4];
1875         ncrcmd  hdata_out2      [  2];
1876         ncrcmd  reset           [  4];
1877         ncrcmd  aborttag        [  4];
1878         ncrcmd  abort           [  2];
1879         ncrcmd  abort_resel     [ 20];
1880         ncrcmd  resend_ident    [  4];
1881         ncrcmd  clratn_go_on    [  3];
1882         ncrcmd  nxtdsp_go_on    [  1];
1883         ncrcmd  sdata_in        [  8];
1884         ncrcmd  data_io         [ 18];
1885         ncrcmd  bad_identify    [ 12];
1886         ncrcmd  bad_i_t_l       [  4];
1887         ncrcmd  bad_i_t_l_q     [  4];
1888         ncrcmd  bad_target      [  8];
1889         ncrcmd  bad_status      [  8];
1890         ncrcmd  start_ram       [  4 + PREFETCH_FLUSH_CNT];
1891         ncrcmd  start_ram0      [  4];
1892         ncrcmd  sto_restart     [  5];
1893         ncrcmd  wait_dma        [  2];
1894         ncrcmd  snooptest       [  9];
1895         ncrcmd  snoopend        [  2];
1896 };
1897 
1898 /*==========================================================
1899 **
1900 **
1901 **      Function headers.
1902 **
1903 **
1904 **==========================================================
1905 */
1906 
1907 static  void    ncr_alloc_ccb   (struct ncb *np, u_char tn, u_char ln);
1908 static  void    ncr_complete    (struct ncb *np, struct ccb *cp);
1909 static  void    ncr_exception   (struct ncb *np);
1910 static  void    ncr_free_ccb    (struct ncb *np, struct ccb *cp);
1911 static  void    ncr_init_ccb    (struct ncb *np, struct ccb *cp);
1912 static  void    ncr_init_tcb    (struct ncb *np, u_char tn);
1913 static  struct lcb *    ncr_alloc_lcb   (struct ncb *np, u_char tn, u_char ln);
1914 static  struct lcb *    ncr_setup_lcb   (struct ncb *np, struct scsi_device *sdev);
1915 static  void    ncr_getclock    (struct ncb *np, int mult);
1916 static  void    ncr_selectclock (struct ncb *np, u_char scntl3);
1917 static  struct ccb *ncr_get_ccb (struct ncb *np, struct scsi_cmnd *cmd);
1918 static  void    ncr_chip_reset  (struct ncb *np, int delay);
1919 static  void    ncr_init        (struct ncb *np, int reset, char * msg, u_long code);
1920 static  int     ncr_int_sbmc    (struct ncb *np);
1921 static  int     ncr_int_par     (struct ncb *np);
1922 static  void    ncr_int_ma      (struct ncb *np);
1923 static  void    ncr_int_sir     (struct ncb *np);
1924 static  void    ncr_int_sto     (struct ncb *np);
1925 static  void    ncr_negotiate   (struct ncb* np, struct tcb* tp);
1926 static  int     ncr_prepare_nego(struct ncb *np, struct ccb *cp, u_char *msgptr);
1927 
1928 static  void    ncr_script_copy_and_bind
1929                                 (struct ncb *np, ncrcmd *src, ncrcmd *dst, int len);
1930 static  void    ncr_script_fill (struct script * scr, struct scripth * scripth);
1931 static  int     ncr_scatter     (struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd);
1932 static  void    ncr_getsync     (struct ncb *np, u_char sfac, u_char *fakp, u_char *scntl3p);
1933 static  void    ncr_setsync     (struct ncb *np, struct ccb *cp, u_char scntl3, u_char sxfer);
1934 static  void    ncr_setup_tags  (struct ncb *np, struct scsi_device *sdev);
1935 static  void    ncr_setwide     (struct ncb *np, struct ccb *cp, u_char wide, u_char ack);
1936 static  int     ncr_snooptest   (struct ncb *np);
1937 static  void    ncr_timeout     (struct ncb *np);
1938 static  void    ncr_wakeup      (struct ncb *np, u_long code);
1939 static  void    ncr_wakeup_done (struct ncb *np);
1940 static  void    ncr_start_next_ccb (struct ncb *np, struct lcb * lp, int maxn);
1941 static  void    ncr_put_start_queue(struct ncb *np, struct ccb *cp);
1942 
1943 static void insert_into_waiting_list(struct ncb *np, struct scsi_cmnd *cmd);
1944 static struct scsi_cmnd *retrieve_from_waiting_list(int to_remove, struct ncb *np, struct scsi_cmnd *cmd);
1945 static void process_waiting_list(struct ncb *np, int sts);
1946 
1947 #define remove_from_waiting_list(np, cmd) \
1948                 retrieve_from_waiting_list(1, (np), (cmd))
1949 #define requeue_waiting_list(np) process_waiting_list((np), DID_OK)
1950 #define reset_waiting_list(np) process_waiting_list((np), DID_RESET)
1951 
1952 static inline char *ncr_name (struct ncb *np)
1953 {
1954         return np->inst_name;
1955 }
1956 
1957 
1958 /*==========================================================
1959 **
1960 **
1961 **      Scripts for NCR-Processor.
1962 **
1963 **      Use ncr_script_bind for binding to physical addresses.
1964 **
1965 **
1966 **==========================================================
1967 **
1968 **      NADDR generates a reference to a field of the controller data.
1969 **      PADDR generates a reference to another part of the script.
1970 **      RADDR generates a reference to a script processor register.
1971 **      FADDR generates a reference to a script processor register
1972 **              with offset.
1973 **
1974 **----------------------------------------------------------
1975 */
1976 
1977 #define RELOC_SOFTC     0x40000000
1978 #define RELOC_LABEL     0x50000000
1979 #define RELOC_REGISTER  0x60000000
1980 #if 0
1981 #define RELOC_KVAR      0x70000000
1982 #endif
1983 #define RELOC_LABELH    0x80000000
1984 #define RELOC_MASK      0xf0000000
1985 
1986 #define NADDR(label)    (RELOC_SOFTC | offsetof(struct ncb, label))
1987 #define PADDR(label)    (RELOC_LABEL | offsetof(struct script, label))
1988 #define PADDRH(label)   (RELOC_LABELH | offsetof(struct scripth, label))
1989 #define RADDR(label)    (RELOC_REGISTER | REG(label))
1990 #define FADDR(label,ofs)(RELOC_REGISTER | ((REG(label))+(ofs)))
1991 #if 0
1992 #define KVAR(which)     (RELOC_KVAR | (which))
1993 #endif
1994 
1995 #if 0
1996 #define SCRIPT_KVAR_JIFFIES     (0)
1997 #define SCRIPT_KVAR_FIRST               SCRIPT_KVAR_JIFFIES
1998 #define SCRIPT_KVAR_LAST                SCRIPT_KVAR_JIFFIES
1999 /*
2000  * Kernel variables referenced in the scripts.
2001  * THESE MUST ALL BE ALIGNED TO A 4-BYTE BOUNDARY.
2002  */
2003 static void *script_kvars[] __initdata =
2004         { (void *)&jiffies };
2005 #endif
2006 
2007 static  struct script script0 __initdata = {
2008 /*--------------------------< START >-----------------------*/ {
2009         /*
2010         **      This NOP will be patched with LED ON
2011         **      SCR_REG_REG (gpreg, SCR_AND, 0xfe)
2012         */
2013         SCR_NO_OP,
2014                 0,
2015         /*
2016         **      Clear SIGP.
2017         */
2018         SCR_FROM_REG (ctest2),
2019                 0,
2020         /*
2021         **      Then jump to a certain point in tryloop.
2022         **      Due to the lack of indirect addressing the code
2023         **      is self modifying here.
2024         */
2025         SCR_JUMP,
2026 }/*-------------------------< STARTPOS >--------------------*/,{
2027                 PADDRH(tryloop),
2028 
2029 }/*-------------------------< SELECT >----------------------*/,{
2030         /*
2031         **      DSA     contains the address of a scheduled
2032         **              data structure.
2033         **
2034         **      SCRATCHA contains the address of the script,
2035         **              which starts the next entry.
2036         **
2037         **      Set Initiator mode.
2038         **
2039         **      (Target mode is left as an exercise for the reader)
2040         */
2041 
2042         SCR_CLR (SCR_TRG),
2043                 0,
2044         SCR_LOAD_REG (HS_REG, HS_SELECTING),
2045                 0,
2046 
2047         /*
2048         **      And try to select this target.
2049         */
2050         SCR_SEL_TBL_ATN ^ offsetof (struct dsb, select),
2051                 PADDR (reselect),
2052 
2053 }/*-------------------------< SELECT2 >----------------------*/,{
2054         /*
2055         **      Now there are 4 possibilities:
2056         **
2057         **      (1) The ncr loses arbitration.
2058         **      This is ok, because it will try again,
2059         **      when the bus becomes idle.
2060         **      (But beware of the timeout function!)
2061         **
2062         **      (2) The ncr is reselected.
2063         **      Then the script processor takes the jump
2064         **      to the RESELECT label.
2065         **
2066         **      (3) The ncr wins arbitration.
2067         **      Then it will execute SCRIPTS instruction until 
2068         **      the next instruction that checks SCSI phase.
2069         **      Then will stop and wait for selection to be 
2070         **      complete or selection time-out to occur.
2071         **      As a result the SCRIPTS instructions until 
2072         **      LOADPOS + 2 should be executed in parallel with 
2073         **      the SCSI core performing selection.
2074         */
2075 
2076         /*
2077         **      The MESSAGE_REJECT problem seems to be due to a selection 
2078         **      timing problem.
2079         **      Wait immediately for the selection to complete. 
2080         **      (2.5x behaves so)
2081         */
2082         SCR_JUMPR ^ IFFALSE (WHEN (SCR_MSG_OUT)),
2083                 0,
2084 
2085         /*
2086         **      Next time use the next slot.
2087         */
2088         SCR_COPY (4),
2089                 RADDR (temp),
2090                 PADDR (startpos),
2091         /*
2092         **      The ncr doesn't have an indirect load
2093         **      or store command. So we have to
2094         **      copy part of the control block to a
2095         **      fixed place, where we can access it.
2096         **
2097         **      We patch the address part of a
2098         **      COPY command with the DSA-register.
2099         */
2100         SCR_COPY_F (4),
2101                 RADDR (dsa),
2102                 PADDR (loadpos),
2103         /*
2104         **      Flush script prefetch if required
2105         */
2106         PREFETCH_FLUSH
2107         /*
2108         **      then we do the actual copy.
2109         */
2110         SCR_COPY (sizeof (struct head)),
2111         /*
2112         **      continued after the next label ...
2113         */
2114 }/*-------------------------< LOADPOS >---------------------*/,{
2115                 0,
2116                 NADDR (header),
2117         /*
2118         **      Wait for the next phase or the selection
2119         **      to complete or time-out.
2120         */
2121         SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
2122                 PADDR (prepare),
2123 
2124 }/*-------------------------< SEND_IDENT >----------------------*/,{
2125         /*
2126         **      Selection complete.
2127         **      Send the IDENTIFY and SIMPLE_TAG messages
2128         **      (and the EXTENDED_SDTR message)
2129         */
2130         SCR_MOVE_TBL ^ SCR_MSG_OUT,
2131                 offsetof (struct dsb, smsg),
2132         SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_OUT)),
2133                 PADDRH (resend_ident),
2134         SCR_LOAD_REG (scratcha, 0x80),
2135                 0,
2136         SCR_COPY (1),
2137                 RADDR (scratcha),
2138                 NADDR (lastmsg),
2139 }/*-------------------------< PREPARE >----------------------*/,{
2140         /*
2141         **      load the savep (saved pointer) into
2142         **      the TEMP register (actual pointer)
2143         */
2144         SCR_COPY (4),
2145                 NADDR (header.savep),
2146                 RADDR (temp),
2147         /*
2148         **      Initialize the status registers
2149         */
2150         SCR_COPY (4),
2151                 NADDR (header.status),
2152                 RADDR (scr0),
2153 }/*-------------------------< PREPARE2 >---------------------*/,{
2154         /*
2155         **      Initialize the msgout buffer with a NOOP message.
2156         */
2157         SCR_LOAD_REG (scratcha, NOP),
2158                 0,
2159         SCR_COPY (1),
2160                 RADDR (scratcha),
2161                 NADDR (msgout),
2162 #if 0
2163         SCR_COPY (1),
2164                 RADDR (scratcha),
2165                 NADDR (msgin),
2166 #endif
2167         /*
2168         **      Anticipate the COMMAND phase.
2169         **      This is the normal case for initial selection.
2170         */
2171         SCR_JUMP ^ IFFALSE (WHEN (SCR_COMMAND)),
2172                 PADDR (dispatch),
2173 
2174 }/*-------------------------< COMMAND >--------------------*/,{
2175         /*
2176         **      ... and send the command
2177         */
2178         SCR_MOVE_TBL ^ SCR_COMMAND,
2179                 offsetof (struct dsb, cmd),
2180         /*
2181         **      If status is still HS_NEGOTIATE, negotiation failed.
2182         **      We check this here, since we want to do that 
2183         **      only once.
2184         */
2185         SCR_FROM_REG (HS_REG),
2186                 0,
2187         SCR_INT ^ IFTRUE (DATA (HS_NEGOTIATE)),
2188                 SIR_NEGO_FAILED,
2189 
2190 }/*-----------------------< DISPATCH >----------------------*/,{
2191         /*
2192         **      MSG_IN is the only phase that shall be 
2193         **      entered at least once for each (re)selection.
2194         **      So we test it first.
2195         */
2196         SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_IN)),
2197                 PADDR (msg_in),
2198 
2199         SCR_RETURN ^ IFTRUE (IF (SCR_DATA_OUT)),
2200                 0,
2201         /*
2202         **      DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 4.
2203         **      Possible data corruption during Memory Write and Invalidate.
2204         **      This work-around resets the addressing logic prior to the 
2205         **      start of the first MOVE of a DATA IN phase.
2206         **      (See Documentation/scsi/ncr53c8xx.txt for more information)
2207         */
2208         SCR_JUMPR ^ IFFALSE (IF (SCR_DATA_IN)),
2209                 20,
2210         SCR_COPY (4),
2211                 RADDR (scratcha),
2212                 RADDR (scratcha),
2213         SCR_RETURN,
2214                 0,
2215         SCR_JUMP ^ IFTRUE (IF (SCR_STATUS)),
2216                 PADDR (status),
2217         SCR_JUMP ^ IFTRUE (IF (SCR_COMMAND)),
2218                 PADDR (command),
2219         SCR_JUMP ^ IFTRUE (IF (SCR_MSG_OUT)),
2220                 PADDR (msg_out),
2221         /*
2222         **      Discard one illegal phase byte, if required.
2223         */
2224         SCR_LOAD_REG (scratcha, XE_BAD_PHASE),
2225                 0,
2226         SCR_COPY (1),
2227                 RADDR (scratcha),
2228                 NADDR (xerr_st),
2229         SCR_JUMPR ^ IFFALSE (IF (SCR_ILG_OUT)),
2230                 8,
2231         SCR_MOVE_ABS (1) ^ SCR_ILG_OUT,
2232                 NADDR (scratch),
2233         SCR_JUMPR ^ IFFALSE (IF (SCR_ILG_IN)),
2234                 8,
2235         SCR_MOVE_ABS (1) ^ SCR_ILG_IN,
2236                 NADDR (scratch),
2237         SCR_JUMP,
2238                 PADDR (dispatch),
2239 
2240 }/*-------------------------< CLRACK >----------------------*/,{
2241         /*
2242         **      Terminate possible pending message phase.
2243         */
2244         SCR_CLR (SCR_ACK),
2245                 0,
2246         SCR_JUMP,
2247                 PADDR (dispatch),
2248 
2249 }/*-------------------------< NO_DATA >--------------------*/,{
2250         /*
2251         **      The target wants to tranfer too much data
2252         **      or in the wrong direction.
2253         **      Remember that in extended error.
2254         */
2255         SCR_LOAD_REG (scratcha, XE_EXTRA_DATA),
2256                 0,
2257         SCR_COPY (1),
2258                 RADDR (scratcha),
2259                 NADDR (xerr_st),
2260         /*
2261         **      Discard one data byte, if required.
2262         */
2263         SCR_JUMPR ^ IFFALSE (WHEN (SCR_DATA_OUT)),
2264                 8,
2265         SCR_MOVE_ABS (1) ^ SCR_DATA_OUT,
2266                 NADDR (scratch),
2267         SCR_JUMPR ^ IFFALSE (IF (SCR_DATA_IN)),
2268                 8,
2269         SCR_MOVE_ABS (1) ^ SCR_DATA_IN,
2270                 NADDR (scratch),
2271         /*
2272         **      .. and repeat as required.
2273         */
2274         SCR_CALL,
2275                 PADDR (dispatch),
2276         SCR_JUMP,
2277                 PADDR (no_data),
2278 
2279 }/*-------------------------< STATUS >--------------------*/,{
2280         /*
2281         **      get the status
2282         */
2283         SCR_MOVE_ABS (1) ^ SCR_STATUS,
2284                 NADDR (scratch),
2285         /*
2286         **      save status to scsi_status.
2287         **      mark as complete.
2288         */
2289         SCR_TO_REG (SS_REG),
2290                 0,
2291         SCR_LOAD_REG (HS_REG, HS_COMPLETE),
2292                 0,
2293         SCR_JUMP,
2294                 PADDR (dispatch),
2295 }/*-------------------------< MSG_IN >--------------------*/,{
2296         /*
2297         **      Get the first byte of the message
2298         **      and save it to SCRATCHA.
2299         **
2300         **      The script processor doesn't negate the
2301         **      ACK signal after this transfer.
2302         */
2303         SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
2304                 NADDR (msgin[0]),
2305 }/*-------------------------< MSG_IN2 >--------------------*/,{
2306         /*
2307         **      Handle this message.
2308         */
2309         SCR_JUMP ^ IFTRUE (DATA (COMMAND_COMPLETE)),
2310                 PADDR (complete),
2311         SCR_JUMP ^ IFTRUE (DATA (DISCONNECT)),
2312                 PADDR (disconnect),
2313         SCR_JUMP ^ IFTRUE (DATA (SAVE_POINTERS)),
2314                 PADDR (save_dp),
2315         SCR_JUMP ^ IFTRUE (DATA (RESTORE_POINTERS)),
2316                 PADDR (restore_dp),
2317         SCR_JUMP ^ IFTRUE (DATA (EXTENDED_MESSAGE)),
2318                 PADDRH (msg_extended),
2319         SCR_JUMP ^ IFTRUE (DATA (NOP)),
2320                 PADDR (clrack),
2321         SCR_JUMP ^ IFTRUE (DATA (MESSAGE_REJECT)),
2322                 PADDRH (msg_reject),
2323         SCR_JUMP ^ IFTRUE (DATA (IGNORE_WIDE_RESIDUE)),
2324                 PADDRH (msg_ign_residue),
2325         /*
2326         **      Rest of the messages left as
2327         **      an exercise ...
2328         **
2329         **      Unimplemented messages:
2330         **      fall through to MSG_BAD.
2331         */
2332 }/*-------------------------< MSG_BAD >------------------*/,{
2333         /*
2334         **      unimplemented message - reject it.
2335         */
2336         SCR_INT,
2337                 SIR_REJECT_SENT,
2338         SCR_LOAD_REG (scratcha, MESSAGE_REJECT),
2339                 0,
2340 }/*-------------------------< SETMSG >----------------------*/,{
2341         SCR_COPY (1),
2342                 RADDR (scratcha),
2343                 NADDR (msgout),
2344         SCR_SET (SCR_ATN),
2345                 0,
2346         SCR_JUMP,
2347                 PADDR (clrack),
2348 }/*-------------------------< CLEANUP >-------------------*/,{
2349         /*
2350         **      dsa:    Pointer to ccb
2351         **            or xxxxxxFF (no ccb)
2352         **
2353         **      HS_REG:   Host-Status (<>0!)
2354         */
2355         SCR_FROM_REG (dsa),
2356                 0,
2357         SCR_JUMP ^ IFTRUE (DATA (0xff)),
2358                 PADDR (start),
2359         /*
2360         **      dsa is valid.
2361         **      complete the cleanup.
2362         */
2363         SCR_JUMP,
2364                 PADDR (cleanup_ok),
2365 
2366 }/*-------------------------< COMPLETE >-----------------*/,{
2367         /*
2368         **      Complete message.
2369         **
2370         **      Copy TEMP register to LASTP in header.
2371         */
2372         SCR_COPY (4),
2373                 RADDR (temp),
2374                 NADDR (header.lastp),
2375         /*
2376         **      When we terminate the cycle by clearing ACK,
2377         **      the target may disconnect immediately.
2378         **
2379         **      We don't want to be told of an
2380         **      "unexpected disconnect",
2381         **      so we disable this feature.
2382         */
2383         SCR_REG_REG (scntl2, SCR_AND, 0x7f),
2384                 0,
2385         /*
2386         **      Terminate cycle ...
2387         */
2388         SCR_CLR (SCR_ACK|SCR_ATN),
2389                 0,
2390         /*
2391         **      ... and wait for the disconnect.
2392         */
2393         SCR_WAIT_DISC,
2394                 0,
2395 }/*-------------------------< CLEANUP_OK >----------------*/,{
2396         /*
2397         **      Save host status to header.
2398         */
2399         SCR_COPY (4),
2400                 RADDR (scr0),
2401                 NADDR (header.status),
2402         /*
2403         **      and copy back the header to the ccb.
2404         */
2405         SCR_COPY_F (4),
2406                 RADDR (dsa),
2407                 PADDR (cleanup0),
2408         /*
2409         **      Flush script prefetch if required
2410         */
2411         PREFETCH_FLUSH
2412         SCR_COPY (sizeof (struct head)),
2413                 NADDR (header),
2414 }/*-------------------------< CLEANUP0 >--------------------*/,{
2415                 0,
2416 }/*-------------------------< SIGNAL >----------------------*/,{
2417         /*
2418         **      if job not completed ...
2419         */
2420         SCR_FROM_REG (HS_REG),
2421                 0,
2422         /*
2423         **      ... start the next command.
2424         */
2425         SCR_JUMP ^ IFTRUE (MASK (0, (HS_DONEMASK|HS_SKIPMASK))),
2426                 PADDR(start),
2427         /*
2428         **      If command resulted in not GOOD status,
2429         **      call the C code if needed.
2430         */
2431         SCR_FROM_REG (SS_REG),
2432                 0,
2433         SCR_CALL ^ IFFALSE (DATA (S_GOOD)),
2434                 PADDRH (bad_status),
2435 
2436 #ifndef SCSI_NCR_CCB_DONE_SUPPORT
2437 
2438         /*
2439         **      ... signal completion to the host
2440         */
2441         SCR_INT,
2442                 SIR_INTFLY,
2443         /*
2444         **      Auf zu neuen Schandtaten!
2445         */
2446         SCR_JUMP,
2447                 PADDR(start),
2448 
2449 #else   /* defined SCSI_NCR_CCB_DONE_SUPPORT */
2450 
2451         /*
2452         **      ... signal completion to the host
2453         */
2454         SCR_JUMP,
2455 }/*------------------------< DONE_POS >---------------------*/,{
2456                 PADDRH (done_queue),
2457 }/*------------------------< DONE_PLUG >--------------------*/,{
2458         SCR_INT,
2459                 SIR_DONE_OVERFLOW,
2460 }/*------------------------< DONE_END >---------------------*/,{
2461         SCR_INT,
2462                 SIR_INTFLY,
2463         SCR_COPY (4),
2464                 RADDR (temp),
2465                 PADDR (done_pos),
2466         SCR_JUMP,
2467                 PADDR (start),
2468 
2469 #endif  /* SCSI_NCR_CCB_DONE_SUPPORT */
2470 
2471 }/*-------------------------< SAVE_DP >------------------*/,{
2472         /*
2473         **      SAVE_DP message:
2474         **      Copy TEMP register to SAVEP in header.
2475         */
2476         SCR_COPY (4),
2477                 RADDR (temp),
2478                 NADDR (header.savep),
2479         SCR_CLR (SCR_ACK),
2480                 0,
2481         SCR_JUMP,
2482                 PADDR (dispatch),
2483 }/*-------------------------< RESTORE_DP >---------------*/,{
2484         /*
2485         **      RESTORE_DP message:
2486         **      Copy SAVEP in header to TEMP register.
2487         */
2488         SCR_COPY (4),
2489                 NADDR (header.savep),
2490                 RADDR (temp),
2491         SCR_JUMP,
2492                 PADDR (clrack),
2493 
2494 }/*-------------------------< DISCONNECT >---------------*/,{
2495         /*
2496         **      DISCONNECTing  ...
2497         **
2498         **      disable the "unexpected disconnect" feature,
2499         **      and remove the ACK signal.
2500         */
2501         SCR_REG_REG (scntl2, SCR_AND, 0x7f),
2502                 0,
2503         SCR_CLR (SCR_ACK|SCR_ATN),
2504                 0,
2505         /*
2506         **      Wait for the disconnect.
2507         */
2508         SCR_WAIT_DISC,
2509                 0,
2510         /*
2511         **      Status is: DISCONNECTED.
2512         */
2513         SCR_LOAD_REG (HS_REG, HS_DISCONNECT),
2514                 0,
2515         SCR_JUMP,
2516                 PADDR (cleanup_ok),
2517 
2518 }/*-------------------------< MSG_OUT >-------------------*/,{
2519         /*
2520         **      The target requests a message.
2521         */
2522         SCR_MOVE_ABS (1) ^ SCR_MSG_OUT,
2523                 NADDR (msgout),
2524         SCR_COPY (1),
2525                 NADDR (msgout),
2526                 NADDR (lastmsg),
2527         /*
2528         **      If it was no ABORT message ...
2529         */
2530         SCR_JUMP ^ IFTRUE (DATA (ABORT_TASK_SET)),
2531                 PADDRH (msg_out_abort),
2532         /*
2533         **      ... wait for the next phase
2534         **      if it's a message out, send it again, ...
2535         */
2536         SCR_JUMP ^ IFTRUE (WHEN (SCR_MSG_OUT)),
2537                 PADDR (msg_out),
2538 }/*-------------------------< MSG_OUT_DONE >--------------*/,{
2539         /*
2540         **      ... else clear the message ...
2541         */
2542         SCR_LOAD_REG (scratcha, NOP),
2543                 0,
2544         SCR_COPY (4),
2545                 RADDR (scratcha),
2546                 NADDR (msgout),
2547         /*
2548         **      ... and process the next phase
2549         */
2550         SCR_JUMP,
2551                 PADDR (dispatch),
2552 }/*-------------------------< IDLE >------------------------*/,{
2553         /*
2554         **      Nothing to do?
2555         **      Wait for reselect.
2556         **      This NOP will be patched with LED OFF
2557         **      SCR_REG_REG (gpreg, SCR_OR, 0x01)
2558         */
2559         SCR_NO_OP,
2560                 0,
2561 }/*-------------------------< RESELECT >--------------------*/,{
2562         /*
2563         **      make the DSA invalid.
2564         */
2565         SCR_LOAD_REG (dsa, 0xff),
2566                 0,
2567         SCR_CLR (SCR_TRG),
2568                 0,
2569         SCR_LOAD_REG (HS_REG, HS_IN_RESELECT),
2570                 0,
2571         /*
2572         **      Sleep waiting for a reselection.
2573         **      If SIGP is set, special treatment.
2574         **
2575         **      Zu allem bereit ..
2576         */
2577         SCR_WAIT_RESEL,
2578                 PADDR(start),
2579 }/*-------------------------< RESELECTED >------------------*/,{
2580         /*
2581         **      This NOP will be patched with LED ON
2582         **      SCR_REG_REG (gpreg, SCR_AND, 0xfe)
2583         */
2584         SCR_NO_OP,
2585                 0,
2586         /*
2587         **      ... zu nichts zu gebrauchen ?
2588         **
2589         **      load the target id into the SFBR
2590         **      and jump to the control block.
2591         **
2592         **      Look at the declarations of
2593         **      - struct ncb
2594         **      - struct tcb
2595         **      - struct lcb
2596         **      - struct ccb
2597         **      to understand what's going on.
2598         */
2599         SCR_REG_SFBR (ssid, SCR_AND, 0x8F),
2600                 0,
2601         SCR_TO_REG (sdid),
2602                 0,
2603         SCR_JUMP,
2604                 NADDR (jump_tcb),
2605 
2606 }/*-------------------------< RESEL_DSA >-------------------*/,{
2607         /*
2608         **      Ack the IDENTIFY or TAG previously received.
2609         */
2610         SCR_CLR (SCR_ACK),
2611                 0,
2612         /*
2613         **      The ncr doesn't have an indirect load
2614         **      or store command. So we have to
2615         **      copy part of the control block to a
2616         **      fixed place, where we can access it.
2617         **
2618         **      We patch the address part of a
2619         **      COPY command with the DSA-register.
2620         */
2621         SCR_COPY_F (4),
2622                 RADDR (dsa),
2623                 PADDR (loadpos1),
2624         /*
2625         **      Flush script prefetch if required
2626         */
2627         PREFETCH_FLUSH
2628         /*
2629         **      then we do the actual copy.
2630         */
2631         SCR_COPY (sizeof (struct head)),
2632         /*
2633         **      continued after the next label ...
2634         */
2635 
2636 }/*-------------------------< LOADPOS1 >-------------------*/,{
2637                 0,
2638                 NADDR (header),
2639         /*
2640         **      The DSA contains the data structure address.
2641         */
2642         SCR_JUMP,
2643                 PADDR (prepare),
2644 
2645 }/*-------------------------< RESEL_LUN >-------------------*/,{
2646         /*
2647         **      come back to this point
2648         **      to get an IDENTIFY message
2649         **      Wait for a msg_in phase.
2650         */
2651         SCR_INT ^ IFFALSE (WHEN (SCR_MSG_IN)),
2652                 SIR_RESEL_NO_MSG_IN,
2653         /*
2654         **      message phase.
2655         **      Read the data directly from the BUS DATA lines.
2656         **      This helps to support very old SCSI devices that 
2657         **      may reselect without sending an IDENTIFY.
2658         */
2659         SCR_FROM_REG (sbdl),
2660                 0,
2661         /*
2662         **      It should be an Identify message.
2663         */
2664         SCR_RETURN,
2665                 0,
2666 }/*-------------------------< RESEL_TAG >-------------------*/,{
2667         /*
2668         **      Read IDENTIFY + SIMPLE + TAG using a single MOVE.
2669         **      Aggressive optimization, is'nt it?
2670         **      No need to test the SIMPLE TAG message, since the 
2671         **      driver only supports conformant devices for tags. ;-)
2672         */
2673         SCR_MOVE_ABS (3) ^ SCR_MSG_IN,
2674                 NADDR (msgin),
2675         /*
2676         **      Read the TAG from the SIDL.
2677         **      Still an aggressive optimization. ;-)
2678         **      Compute the CCB indirect jump address which 
2679         **      is (#TAG*2 & 0xfc) due to tag numbering using 
2680         **      1,3,5..MAXTAGS*2+1 actual values.
2681         */
2682         SCR_REG_SFBR (sidl, SCR_SHL, 0),
2683                 0,
2684         SCR_SFBR_REG (temp, SCR_AND, 0xfc),
2685                 0,
2686 }/*-------------------------< JUMP_TO_NEXUS >-------------------*/,{
2687         SCR_COPY_F (4),
2688                 RADDR (temp),
2689                 PADDR (nexus_indirect),
2690         /*
2691         **      Flush script prefetch if required
2692         */
2693         PREFETCH_FLUSH
2694         SCR_COPY (4),
2695 }/*-------------------------< NEXUS_INDIRECT >-------------------*/,{
2696                 0,
2697                 RADDR (temp),
2698         SCR_RETURN,
2699                 0,
2700 }/*-------------------------< RESEL_NOTAG >-------------------*/,{
2701         /*
2702         **      No tag expected.
2703         **      Read an throw away the IDENTIFY.
2704         */
2705         SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
2706                 NADDR (msgin),
2707         SCR_JUMP,
2708                 PADDR (jump_to_nexus),
2709 }/*-------------------------< DATA_IN >--------------------*/,{
2710 /*
2711 **      Because the size depends on the
2712 **      #define MAX_SCATTERL parameter,
2713 **      it is filled in at runtime.
2714 **
2715 **  ##===========< i=0; i<MAX_SCATTERL >=========
2716 **  ||  SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN)),
2717 **  ||          PADDR (dispatch),
2718 **  ||  SCR_MOVE_TBL ^ SCR_DATA_IN,
2719 **  ||          offsetof (struct dsb, data[ i]),
2720 **  ##==========================================
2721 **
2722 **---------------------------------------------------------
2723 */
2724 0
2725 }/*-------------------------< DATA_IN2 >-------------------*/,{
2726         SCR_CALL,
2727                 PADDR (dispatch),
2728         SCR_JUMP,
2729                 PADDR (no_data),
2730 }/*-------------------------< DATA_OUT >--------------------*/,{
2731 /*
2732 **      Because the size depends on the
2733 **      #define MAX_SCATTERL parameter,
2734 **      it is filled in at runtime.
2735 **
2736 **  ##===========< i=0; i<MAX_SCATTERL >=========
2737 **  ||  SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT)),
2738 **  ||          PADDR (dispatch),
2739 **  ||  SCR_MOVE_TBL ^ SCR_DATA_OUT,
2740 **  ||          offsetof (struct dsb, data[ i]),
2741 **  ##==========================================
2742 **
2743 **---------------------------------------------------------
2744 */
2745 0
2746 }/*-------------------------< DATA_OUT2 >-------------------*/,{
2747         SCR_CALL,
2748                 PADDR (dispatch),
2749         SCR_JUMP,
2750                 PADDR (no_data),
2751 }/*--------------------------------------------------------*/
2752 };
2753 
2754 static  struct scripth scripth0 __initdata = {
2755 /*-------------------------< TRYLOOP >---------------------*/{
2756 /*
2757 **      Start the next entry.
2758 **      Called addresses point to the launch script in the CCB.
2759 **      They are patched by the main processor.
2760 **
2761 **      Because the size depends on the
2762 **      #define MAX_START parameter, it is filled
2763 **      in at runtime.
2764 **
2765 **-----------------------------------------------------------
2766 **
2767 **  ##===========< I=0; i<MAX_START >===========
2768 **  ||  SCR_CALL,
2769 **  ||          PADDR (idle),
2770 **  ##==========================================
2771 **
2772 **-----------------------------------------------------------
2773 */
2774 0
2775 }/*------------------------< TRYLOOP2 >---------------------*/,{
2776         SCR_JUMP,
2777                 PADDRH(tryloop),
2778 
2779 #ifdef SCSI_NCR_CCB_DONE_SUPPORT
2780 
2781 }/*------------------------< DONE_QUEUE >-------------------*/,{
2782 /*
2783 **      Copy the CCB address to the next done entry.
2784 **      Because the size depends on the
2785 **      #define MAX_DONE parameter, it is filled
2786 **      in at runtime.
2787 **
2788 **-----------------------------------------------------------
2789 **
2790 **  ##===========< I=0; i<MAX_DONE >===========
2791 **  ||  SCR_COPY (sizeof(struct ccb *),
2792 **  ||          NADDR (header.cp),
2793 **  ||          NADDR (ccb_done[i]),
2794 **  ||  SCR_CALL,
2795 **  ||          PADDR (done_end),
2796 **  ##==========================================
2797 **
2798 **-----------------------------------------------------------
2799 */
2800 0
2801 }/*------------------------< DONE_QUEUE2 >------------------*/,{
2802         SCR_JUMP,
2803                 PADDRH (done_queue),
2804 
2805 #endif /* SCSI_NCR_CCB_DONE_SUPPORT */
2806 }/*------------------------< SELECT_NO_ATN >-----------------*/,{
2807         /*
2808         **      Set Initiator mode.
2809         **      And try to select this target without ATN.
2810         */
2811 
2812         SCR_CLR (SCR_TRG),
2813                 0,
2814         SCR_LOAD_REG (HS_REG, HS_SELECTING),
2815                 0,
2816         SCR_SEL_TBL ^ offsetof (struct dsb, select),
2817                 PADDR (reselect),
2818         SCR_JUMP,
2819                 PADDR (select2),
2820 
2821 }/*-------------------------< CANCEL >------------------------*/,{
2822 
2823         SCR_LOAD_REG (scratcha, HS_ABORTED),
2824                 0,
2825         SCR_JUMPR,
2826                 8,
2827 }/*-------------------------< SKIP >------------------------*/,{
2828         SCR_LOAD_REG (scratcha, 0),
2829                 0,
2830         /*
2831         **      This entry has been canceled.
2832         **      Next time use the next slot.
2833         */
2834         SCR_COPY (4),
2835                 RADDR (temp),
2836                 PADDR (startpos),
2837         /*
2838         **      The ncr doesn't have an indirect load
2839         **      or store command. So we have to
2840         **      copy part of the control block to a
2841         **      fixed place, where we can access it.
2842         **
2843         **      We patch the address part of a
2844         **      COPY command with the DSA-register.
2845         */
2846         SCR_COPY_F (4),
2847                 RADDR (dsa),
2848                 PADDRH (skip2),
2849         /*
2850         **      Flush script prefetch if required
2851         */
2852         PREFETCH_FLUSH
2853         /*
2854         **      then we do the actual copy.
2855         */
2856         SCR_COPY (sizeof (struct head)),
2857         /*
2858         **      continued after the next label ...
2859         */
2860 }/*-------------------------< SKIP2 >---------------------*/,{
2861                 0,
2862                 NADDR (header),
2863         /*
2864         **      Initialize the status registers
2865         */
2866         SCR_COPY (4),
2867                 NADDR (header.status),
2868                 RADDR (scr0),
2869         /*
2870         **      Force host status.
2871         */
2872         SCR_FROM_REG (scratcha),
2873                 0,
2874         SCR_JUMPR ^ IFFALSE (MASK (0, HS_DONEMASK)),
2875                 16,
2876         SCR_REG_REG (HS_REG, SCR_OR, HS_SKIPMASK),
2877                 0,
2878         SCR_JUMPR,
2879                 8,
2880         SCR_TO_REG (HS_REG),
2881                 0,
2882         SCR_LOAD_REG (SS_REG, S_GOOD),
2883                 0,
2884         SCR_JUMP,
2885                 PADDR (cleanup_ok),
2886 
2887 },/*-------------------------< PAR_ERR_DATA_IN >---------------*/{
2888         /*
2889         **      Ignore all data in byte, until next phase
2890         */
2891         SCR_JUMP ^ IFFALSE (WHEN (SCR_DATA_IN)),
2892                 PADDRH (par_err_other),
2893         SCR_MOVE_ABS (1) ^ SCR_DATA_IN,
2894                 NADDR (scratch),
2895         SCR_JUMPR,
2896                 -24,
2897 },/*-------------------------< PAR_ERR_OTHER >------------------*/{
2898         /*
2899         **      count it.
2900         */
2901         SCR_REG_REG (PS_REG, SCR_ADD, 0x01),
2902                 0,
2903         /*
2904         **      jump to dispatcher.
2905         */
2906         SCR_JUMP,
2907                 PADDR (dispatch),
2908 }/*-------------------------< MSG_REJECT >---------------*/,{
2909         /*
2910         **      If a negotiation was in progress,
2911         **      negotiation failed.
2912         **      Otherwise, let the C code print 
2913         **      some message.
2914         */
2915         SCR_FROM_REG (HS_REG),
2916                 0,
2917         SCR_INT ^ IFFALSE (DATA (HS_NEGOTIATE)),
2918                 SIR_REJECT_RECEIVED,
2919         SCR_INT ^ IFTRUE (DATA (HS_NEGOTIATE)),
2920                 SIR_NEGO_FAILED,
2921         SCR_JUMP,
2922                 PADDR (clrack),
2923 
2924 }/*-------------------------< MSG_IGN_RESIDUE >----------*/,{
2925         /*
2926         **      Terminate cycle
2927         */
2928         SCR_CLR (SCR_ACK),
2929                 0,
2930         SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
2931                 PADDR (dispatch),
2932         /*
2933         **      get residue size.
2934         */
2935         SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
2936                 NADDR (msgin[1]),
2937         /*
2938         **      Size is 0 .. ignore message.
2939         */
2940         SCR_JUMP ^ IFTRUE (DATA (0)),
2941                 PADDR (clrack),
2942         /*
2943         **      Size is not 1 .. have to interrupt.
2944         */
2945         SCR_JUMPR ^ IFFALSE (DATA (1)),
2946                 40,
2947         /*
2948         **      Check for residue byte in swide register
2949         */
2950         SCR_FROM_REG (scntl2),
2951                 0,
2952         SCR_JUMPR ^ IFFALSE (MASK (WSR, WSR)),
2953                 16,
2954         /*
2955         **      There IS data in the swide register.
2956         **      Discard it.
2957         */
2958         SCR_REG_REG (scntl2, SCR_OR, WSR),
2959                 0,
2960         SCR_JUMP,
2961                 PADDR (clrack),
2962         /*
2963         **      Load again the size to the sfbr register.
2964         */
2965         SCR_FROM_REG (scratcha),
2966                 0,
2967         SCR_INT,
2968                 SIR_IGN_RESIDUE,
2969         SCR_JUMP,
2970                 PADDR (clrack),
2971 
2972 }/*-------------------------< MSG_EXTENDED >-------------*/,{
2973         /*
2974         **      Terminate cycle
2975         */
2976         SCR_CLR (SCR_ACK),
2977                 0,
2978         SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
2979                 PADDR (dispatch),
2980         /*
2981         **      get length.
2982         */
2983         SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
2984                 NADDR (msgin[1]),
2985         /*
2986         */
2987         SCR_JUMP ^ IFTRUE (DATA (3)),
2988                 PADDRH (msg_ext_3),
2989         SCR_JUMP ^ IFFALSE (DATA (2)),
2990                 PADDR (msg_bad),
2991 }/*-------------------------< MSG_EXT_2 >----------------*/,{
2992         SCR_CLR (SCR_ACK),
2993                 0,
2994         SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
2995                 PADDR (dispatch),
2996         /*
2997         **      get extended message code.
2998         */
2999         SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
3000                 NADDR (msgin[2]),
3001         SCR_JUMP ^ IFTRUE (DATA (EXTENDED_WDTR)),
3002                 PADDRH (msg_wdtr),
3003         /*
3004         **      unknown extended message
3005         */
3006         SCR_JUMP,
3007                 PADDR (msg_bad)
3008 }/*-------------------------< MSG_WDTR >-----------------*/,{
3009         SCR_CLR (SCR_ACK),
3010                 0,
3011         SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
3012                 PADDR (dispatch),
3013         /*
3014         **      get data bus width
3015         */
3016         SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
3017                 NADDR (msgin[3]),
3018         /*
3019         **      let the host do the real work.
3020         */
3021         SCR_INT,
3022                 SIR_NEGO_WIDE,
3023         /*
3024         **      let the target fetch our answer.
3025         */
3026         SCR_SET (SCR_ATN),
3027                 0,
3028         SCR_CLR (SCR_ACK),
3029                 0,
3030         SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
3031                 PADDRH (nego_bad_phase),
3032 
3033 }/*-------------------------< SEND_WDTR >----------------*/,{
3034         /*
3035         **      Send the EXTENDED_WDTR
3036         */
3037         SCR_MOVE_ABS (4) ^ SCR_MSG_OUT,
3038                 NADDR (msgout),
3039         SCR_COPY (1),
3040                 NADDR (msgout),
3041                 NADDR (lastmsg),
3042         SCR_JUMP,
3043                 PADDR (msg_out_done),
3044 
3045 }/*-------------------------< MSG_EXT_3 >----------------*/,{
3046         SCR_CLR (SCR_ACK),
3047                 0,
3048         SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
3049                 PADDR (dispatch),
3050         /*
3051         **      get extended message code.
3052         */
3053         SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
3054                 NADDR (msgin[2]),
3055         SCR_JUMP ^ IFTRUE (DATA (EXTENDED_SDTR)),
3056                 PADDRH (msg_sdtr),
3057         /*
3058         **      unknown extended message
3059         */
3060         SCR_JUMP,
3061                 PADDR (msg_bad)
3062 
3063 }/*-------------------------< MSG_SDTR >-----------------*/,{
3064         SCR_CLR (SCR_ACK),
3065                 0,
3066         SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_IN)),
3067                 PADDR (dispatch),
3068         /*
3069         **      get period and offset
3070         */
3071         SCR_MOVE_ABS (2) ^ SCR_MSG_IN,
3072                 NADDR (msgin[3]),
3073         /*
3074         **      let the host do the real work.
3075         */
3076         SCR_INT,
3077                 SIR_NEGO_SYNC,
3078         /*
3079         **      let the target fetch our answer.
3080         */
3081         SCR_SET (SCR_ATN),
3082                 0,
3083         SCR_CLR (SCR_ACK),
3084                 0,
3085         SCR_JUMP ^ IFFALSE (WHEN (SCR_MSG_OUT)),
3086                 PADDRH (nego_bad_phase),
3087 
3088 }/*-------------------------< SEND_SDTR >-------------*/,{
3089         /*
3090         **      Send the EXTENDED_SDTR
3091         */
3092         SCR_MOVE_ABS (5) ^ SCR_MSG_OUT,
3093                 NADDR (msgout),
3094         SCR_COPY (1),
3095                 NADDR (msgout),
3096                 NADDR (lastmsg),
3097         SCR_JUMP,
3098                 PADDR (msg_out_done),
3099 
3100 }/*-------------------------< NEGO_BAD_PHASE >------------*/,{
3101         SCR_INT,
3102                 SIR_NEGO_PROTO,
3103         SCR_JUMP,
3104                 PADDR (dispatch),
3105 
3106 }/*-------------------------< MSG_OUT_ABORT >-------------*/,{
3107         /*
3108         **      After ABORT message,
3109         **
3110         **      expect an immediate disconnect, ...
3111         */
3112         SCR_REG_REG (scntl2, SCR_AND, 0x7f),
3113                 0,
3114         SCR_CLR (SCR_ACK|SCR_ATN),
3115                 0,
3116         SCR_WAIT_DISC,
3117                 0,
3118         /*
3119         **      ... and set the status to "ABORTED"
3120         */
3121         SCR_LOAD_REG (HS_REG, HS_ABORTED),
3122                 0,
3123         SCR_JUMP,
3124                 PADDR (cleanup),
3125 
3126 }/*-------------------------< HDATA_IN >-------------------*/,{
3127 /*
3128 **      Because the size depends on the
3129 **      #define MAX_SCATTERH parameter,
3130 **      it is filled in at runtime.
3131 **
3132 **  ##==< i=MAX_SCATTERL; i<MAX_SCATTERL+MAX_SCATTERH >==
3133 **  ||  SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN)),
3134 **  ||          PADDR (dispatch),
3135 **  ||  SCR_MOVE_TBL ^ SCR_DATA_IN,
3136 **  ||          offsetof (struct dsb, data[ i]),
3137 **  ##===================================================
3138 **
3139 **---------------------------------------------------------
3140 */
3141 0
3142 }/*-------------------------< HDATA_IN2 >------------------*/,{
3143         SCR_JUMP,
3144                 PADDR (data_in),
3145 
3146 }/*-------------------------< HDATA_OUT >-------------------*/,{
3147 /*
3148 **      Because the size depends on the
3149 **      #define MAX_SCATTERH parameter,
3150 **      it is filled in at runtime.
3151 **
3152 **  ##==< i=MAX_SCATTERL; i<MAX_SCATTERL+MAX_SCATTERH >==
3153 **  ||  SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT)),
3154 **  ||          PADDR (dispatch),
3155 **  ||  SCR_MOVE_TBL ^ SCR_DATA_OUT,
3156 **  ||          offsetof (struct dsb, data[ i]),
3157 **  ##===================================================
3158 **
3159 **---------------------------------------------------------
3160 */
3161 0
3162 }/*-------------------------< HDATA_OUT2 >------------------*/,{
3163         SCR_JUMP,
3164                 PADDR (data_out),
3165 
3166 }/*-------------------------< RESET >----------------------*/,{
3167         /*
3168         **      Send a TARGET_RESET message if bad IDENTIFY 
3169         **      received on reselection.
3170         */
3171         SCR_LOAD_REG (scratcha, ABORT_TASK),
3172                 0,
3173         SCR_JUMP,
3174                 PADDRH (abort_resel),
3175 }/*-------------------------< ABORTTAG >-------------------*/,{
3176         /*
3177         **      Abort a wrong tag received on reselection.
3178         */
3179         SCR_LOAD_REG (scratcha, ABORT_TASK),
3180                 0,
3181         SCR_JUMP,
3182                 PADDRH (abort_resel),
3183 }/*-------------------------< ABORT >----------------------*/,{
3184         /*
3185         **      Abort a reselection when no active CCB.
3186         */
3187         SCR_LOAD_REG (scratcha, ABORT_TASK_SET),
3188                 0,
3189 }/*-------------------------< ABORT_RESEL >----------------*/,{
3190         SCR_COPY (1),
3191                 RADDR (scratcha),
3192                 NADDR (msgout),
3193         SCR_SET (SCR_ATN),
3194                 0,
3195         SCR_CLR (SCR_ACK),
3196                 0,
3197         /*
3198         **      and send it.
3199         **      we expect an immediate disconnect
3200         */
3201         SCR_REG_REG (scntl2, SCR_AND, 0x7f),
3202                 0,
3203         SCR_MOVE_ABS (1) ^ SCR_MSG_OUT,
3204                 NADDR (msgout),
3205         SCR_COPY (1),
3206                 NADDR (msgout),
3207                 NADDR (lastmsg),
3208         SCR_CLR (SCR_ACK|SCR_ATN),
3209                 0,
3210         SCR_WAIT_DISC,
3211                 0,
3212         SCR_JUMP,
3213                 PADDR (start),
3214 }/*-------------------------< RESEND_IDENT >-------------------*/,{
3215         /*
3216         **      The target stays in MSG OUT phase after having acked 
3217         **      Identify [+ Tag [+ Extended message ]]. Targets shall
3218         **      behave this way on parity error.
3219         **      We must send it again all the messages.
3220         */
3221         SCR_SET (SCR_ATN), /* Shall be asserted 2 deskew delays before the  */
3222                 0,         /* 1rst ACK = 90 ns. Hope the NCR is'nt too fast */
3223         SCR_JUMP,
3224                 PADDR (send_ident),
3225 }/*-------------------------< CLRATN_GO_ON >-------------------*/,{
3226         SCR_CLR (SCR_ATN),
3227                 0,
3228         SCR_JUMP,
3229 }/*-------------------------< NXTDSP_GO_ON >-------------------*/,{
3230                 0,
3231 }/*-------------------------< SDATA_IN >-------------------*/,{
3232         SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN)),
3233                 PADDR (dispatch),
3234         SCR_MOVE_TBL ^ SCR_DATA_IN,
3235                 offsetof (struct dsb, sense),
3236         SCR_CALL,
3237                 PADDR (dispatch),
3238         SCR_JUMP,
3239                 PADDR (no_data),
3240 }/*-------------------------< DATA_IO >--------------------*/,{
3241         /*
3242         **      We jump here if the data direction was unknown at the 
3243         **      time we had to queue the command to the scripts processor.
3244         **      Pointers had been set as follow in this situation:
3245         **        savep   -->   DATA_IO
3246         **        lastp   -->   start pointer when DATA_IN
3247         **        goalp   -->   goal  pointer when DATA_IN
3248         **        wlastp  -->   start pointer when DATA_OUT
3249         **        wgoalp  -->   goal  pointer when DATA_OUT
3250         **      This script sets savep/lastp/goalp according to the 
3251         **      direction chosen by the target.
3252         */
3253         SCR_JUMPR ^ IFTRUE (WHEN (SCR_DATA_OUT)),
3254                 32,
3255         /*
3256         **      Direction is DATA IN.
3257         **      Warning: we jump here, even when phase is DATA OUT.
3258         */
3259         SCR_COPY (4),
3260                 NADDR (header.lastp),
3261                 NADDR (header.savep),
3262 
3263         /*
3264         **      Jump to the SCRIPTS according to actual direction.
3265         */
3266         SCR_COPY (4),
3267                 NADDR (header.savep),
3268                 RADDR (temp),
3269         SCR_RETURN,
3270                 0,
3271         /*
3272         **      Direction is DATA OUT.
3273         */
3274         SCR_COPY (4),
3275                 NADDR (header.wlastp),
3276                 NADDR (header.lastp),
3277         SCR_COPY (4),
3278                 NADDR (header.wgoalp),
3279                 NADDR (header.goalp),
3280         SCR_JUMPR,
3281                 -64,
3282 }/*-------------------------< BAD_IDENTIFY >---------------*/,{
3283         /*
3284         **      If message phase but not an IDENTIFY,
3285         **      get some help from the C code.
3286         **      Old SCSI device may behave so.
3287         */
3288         SCR_JUMPR ^ IFTRUE (MASK (0x80, 0x80)),
3289                 16,
3290         SCR_INT,
3291                 SIR_RESEL_NO_IDENTIFY,
3292         SCR_JUMP,
3293                 PADDRH (reset),
3294         /*
3295         **      Message is an IDENTIFY, but lun is unknown.
3296         **      Read the message, since we got it directly 
3297         **      from the SCSI BUS data lines.
3298         **      Signal problem to C code for logging the event.
3299         **      Send an ABORT_TASK_SET to clear all pending tasks.
3300         */
3301         SCR_INT,
3302                 SIR_RESEL_BAD_LUN,
3303         SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
3304                 NADDR (msgin),
3305         SCR_JUMP,
3306                 PADDRH (abort),
3307 }/*-------------------------< BAD_I_T_L >------------------*/,{
3308         /*
3309         **      We donnot have a task for that I_T_L.
3310         **      Signal problem to C code for logging the event.
3311         **      Send an ABORT_TASK_SET message.
3312         */
3313         SCR_INT,
3314                 SIR_RESEL_BAD_I_T_L,
3315         SCR_JUMP,
3316                 PADDRH (abort),
3317 }/*-------------------------< BAD_I_T_L_Q >----------------*/,{
3318         /*
3319         **      We donnot have a task that matches the tag.
3320         **      Signal problem to C code for logging the event.
3321         **      Send an ABORT_TASK message.
3322         */
3323         SCR_INT,
3324                 SIR_RESEL_BAD_I_T_L_Q,
3325         SCR_JUMP,
3326                 PADDRH (aborttag),
3327 }/*-------------------------< BAD_TARGET >-----------------*/,{
3328         /*
3329         **      We donnot know the target that reselected us.
3330         **      Grab the first message if any (IDENTIFY).
3331         **      Signal problem to C code for logging the event.
3332         **      TARGET_RESET message.
3333         */
3334         SCR_INT,
3335                 SIR_RESEL_BAD_TARGET,
3336         SCR_JUMPR ^ IFFALSE (WHEN (SCR_MSG_IN)),
3337                 8,
3338         SCR_MOVE_ABS (1) ^ SCR_MSG_IN,
3339                 NADDR (msgin),
3340         SCR_JUMP,
3341                 PADDRH (reset),
3342 }/*-------------------------< BAD_STATUS >-----------------*/,{
3343         /*
3344         **      If command resulted in either QUEUE FULL,
3345         **      CHECK CONDITION or COMMAND TERMINATED,
3346         **      call the C code.
3347         */
3348         SCR_INT ^ IFTRUE (DATA (S_QUEUE_FULL)),
3349                 SIR_BAD_STATUS,
3350         SCR_INT ^ IFTRUE (DATA (S_CHECK_COND)),
3351                 SIR_BAD_STATUS,
3352         SCR_INT ^ IFTRUE (DATA (S_TERMINATED)),
3353                 SIR_BAD_STATUS,
3354         SCR_RETURN,
3355                 0,
3356 }/*-------------------------< START_RAM >-------------------*/,{
3357         /*
3358         **      Load the script into on-chip RAM, 
3359         **      and jump to start point.
3360         */
3361         SCR_COPY_F (4),
3362                 RADDR (scratcha),
3363                 PADDRH (start_ram0),
3364         /*
3365         **      Flush script prefetch if required
3366         */
3367         PREFETCH_FLUSH
3368         SCR_COPY (sizeof (struct script)),
3369 }/*-------------------------< START_RAM0 >--------------------*/,{
3370                 0,
3371                 PADDR (start),
3372         SCR_JUMP,
3373                 PADDR (start),
3374 }/*-------------------------< STO_RESTART >-------------------*/,{
3375         /*
3376         **
3377         **      Repair start queue (e.g. next time use the next slot) 
3378         **      and jump to start point.
3379         */
3380         SCR_COPY (4),
3381                 RADDR (temp),
3382                 PADDR (startpos),
3383         SCR_JUMP,
3384                 PADDR (start),
3385 }/*-------------------------< WAIT_DMA >-------------------*/,{
3386         /*
3387         **      For HP Zalon/53c720 systems, the Zalon interface
3388         **      between CPU and 53c720 does prefetches, which causes
3389         **      problems with self modifying scripts.  The problem
3390         **      is overcome by calling a dummy subroutine after each
3391         **      modification, to force a refetch of the script on
3392         **      return from the subroutine.
3393         */
3394         SCR_RETURN,
3395                 0,
3396 }/*-------------------------< SNOOPTEST >-------------------*/,{
3397         /*
3398         **      Read the variable.
3399         */
3400         SCR_COPY (4),
3401                 NADDR(ncr_cache),
3402                 RADDR (scratcha),
3403         /*
3404         **      Write the variable.
3405         */
3406         SCR_COPY (4),
3407                 RADDR (temp),
3408                 NADDR(ncr_cache),
3409         /*
3410         **      Read back the variable.
3411         */
3412         SCR_COPY (4),
3413                 NADDR(ncr_cache),
3414                 RADDR (temp),
3415 }/*-------------------------< SNOOPEND >-------------------*/,{
3416         /*
3417         **      And stop.
3418         */
3419         SCR_INT,
3420                 99,
3421 }/*--------------------------------------------------------*/
3422 };
3423 
3424 /*==========================================================
3425 **
3426 **
3427 **      Fill in #define dependent parts of the script
3428 **
3429 **
3430 **==========================================================
3431 */
3432 
3433 void __init ncr_script_fill (struct script * scr, struct scripth * scrh)
3434 {
3435         int     i;
3436         ncrcmd  *p;
3437 
3438         p = scrh->tryloop;
3439         for (i=0; i<MAX_START; i++) {
3440                 *p++ =SCR_CALL;
3441                 *p++ =PADDR (idle);
3442         }
3443 
3444         BUG_ON((u_long)p != (u_long)&scrh->tryloop + sizeof (scrh->tryloop));
3445 
3446 #ifdef SCSI_NCR_CCB_DONE_SUPPORT
3447 
3448         p = scrh->done_queue;
3449         for (i = 0; i<MAX_DONE; i++) {
3450                 *p++ =SCR_COPY (sizeof(struct ccb *));
3451                 *p++ =NADDR (header.cp);
3452                 *p++ =NADDR (ccb_done[i]);
3453                 *p++ =SCR_CALL;
3454                 *p++ =PADDR (done_end);
3455         }
3456 
3457         BUG_ON((u_long)p != (u_long)&scrh->done_queue+sizeof(scrh->done_queue));
3458 
3459 #endif /* SCSI_NCR_CCB_DONE_SUPPORT */
3460 
3461         p = scrh->hdata_in;
3462         for (i=0; i<MAX_SCATTERH; i++) {
3463                 *p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN));
3464                 *p++ =PADDR (dispatch);
3465                 *p++ =SCR_MOVE_TBL ^ SCR_DATA_IN;
3466                 *p++ =offsetof (struct dsb, data[i]);
3467         }
3468 
3469         BUG_ON((u_long)p != (u_long)&scrh->hdata_in + sizeof (scrh->hdata_in));
3470 
3471         p = scr->data_in;
3472         for (i=MAX_SCATTERH; i<MAX_SCATTERH+MAX_SCATTERL; i++) {
3473                 *p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_IN));
3474                 *p++ =PADDR (dispatch);
3475                 *p++ =SCR_MOVE_TBL ^ SCR_DATA_IN;
3476                 *p++ =offsetof (struct dsb, data[i]);
3477         }
3478 
3479         BUG_ON((u_long)p != (u_long)&scr->data_in + sizeof (scr->data_in));
3480 
3481         p = scrh->hdata_out;
3482         for (i=0; i<MAX_SCATTERH; i++) {
3483                 *p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT));
3484                 *p++ =PADDR (dispatch);
3485                 *p++ =SCR_MOVE_TBL ^ SCR_DATA_OUT;
3486                 *p++ =offsetof (struct dsb, data[i]);
3487         }
3488 
3489         BUG_ON((u_long)p != (u_long)&scrh->hdata_out + sizeof (scrh->hdata_out));
3490 
3491         p = scr->data_out;
3492         for (i=MAX_SCATTERH; i<MAX_SCATTERH+MAX_SCATTERL; i++) {
3493                 *p++ =SCR_CALL ^ IFFALSE (WHEN (SCR_DATA_OUT));
3494                 *p++ =PADDR (dispatch);
3495                 *p++ =SCR_MOVE_TBL ^ SCR_DATA_OUT;
3496                 *p++ =offsetof (struct dsb, data[i]);
3497         }
3498 
3499         BUG_ON((u_long) p != (u_long)&scr->data_out + sizeof (scr->data_out));
3500 }
3501 
3502 /*==========================================================
3503 **
3504 **
3505 **      Copy and rebind a script.
3506 **
3507 **
3508 **==========================================================
3509 */
3510 
3511 static void __init 
3512 ncr_script_copy_and_bind (struct ncb *np, ncrcmd *src, ncrcmd *dst, int len)
3513 {
3514         ncrcmd  opcode, new, old, tmp1, tmp2;
3515         ncrcmd  *start, *end;
3516         int relocs;
3517         int opchanged = 0;
3518 
3519         start = src;
3520         end = src + len/4;
3521 
3522         while (src < end) {
3523 
3524                 opcode = *src++;
3525                 *dst++ = cpu_to_scr(opcode);
3526 
3527                 /*
3528                 **      If we forget to change the length
3529                 **      in struct script, a field will be
3530                 **      padded with 0. This is an illegal
3531                 **      command.
3532                 */
3533 
3534                 if (opcode == 0) {
3535                         printk (KERN_ERR "%s: ERROR0 IN SCRIPT at %d.\n",
3536                                 ncr_name(np), (int) (src-start-1));
3537                         mdelay(1000);
3538                 }
3539 
3540                 if (DEBUG_FLAGS & DEBUG_SCRIPT)
3541                         printk (KERN_DEBUG "%p:  <%x>\n",
3542                                 (src-1), (unsigned)opcode);
3543 
3544                 /*
3545                 **      We don't have to decode ALL commands
3546                 */
3547                 switch (opcode >> 28) {
3548 
3549                 case 0xc:
3550                         /*
3551                         **      COPY has TWO arguments.
3552                         */
3553                         relocs = 2;
3554                         tmp1 = src[0];
3555 #ifdef  RELOC_KVAR
3556                         if ((tmp1 & RELOC_MASK) == RELOC_KVAR)
3557                                 tmp1 = 0;
3558 #endif
3559                         tmp2 = src[1];
3560 #ifdef  RELOC_KVAR
3561                         if ((tmp2 & RELOC_MASK) == RELOC_KVAR)
3562                                 tmp2 = 0;
3563 #endif
3564                         if ((tmp1 ^ tmp2) & 3) {
3565                                 printk (KERN_ERR"%s: ERROR1 IN SCRIPT at %d.\n",
3566                                         ncr_name(np), (int) (src-start-1));
3567                                 mdelay(1000);
3568                         }
3569                         /*
3570                         **      If PREFETCH feature not enabled, remove 
3571                         **      the NO FLUSH bit if present.
3572                         */
3573                         if ((opcode & SCR_NO_FLUSH) && !(np->features & FE_PFEN)) {
3574                                 dst[-1] = cpu_to_scr(opcode & ~SCR_NO_FLUSH);
3575                                 ++opchanged;
3576                         }
3577                         break;
3578 
3579                 case 0x0:
3580                         /*
3581                         **      MOVE (absolute address)
3582                         */
3583                         relocs = 1;
3584                         break;
3585 
3586                 case 0x8:
3587                         /*
3588                         **      JUMP / CALL
3589                         **      don't relocate if relative :-)
3590                         */
3591                         if (opcode & 0x00800000)
3592                                 relocs = 0;
3593                         else
3594                                 relocs = 1;
3595                         break;
3596 
3597                 case 0x4:
3598                 case 0x5:
3599                 case 0x6:
3600                 case 0x7:
3601                         relocs = 1;
3602                         break;
3603 
3604                 default:
3605                         relocs = 0;
3606                         break;
3607                 }
3608 
3609                 if (relocs) {
3610                         while (relocs--) {
3611                                 old = *src++;
3612 
3613                                 switch (old & RELOC_MASK) {
3614                                 case RELOC_REGISTER:
3615                                         new = (old & ~RELOC_MASK) + np->paddr;
3616                                         break;
3617                                 case RELOC_LABEL:
3618                                         new = (old & ~RELOC_MASK) + np->p_script;
3619                                         break;
3620                                 case RELOC_LABELH:
3621                                         new = (old & ~RELOC_MASK) + np->p_scripth;
3622                                         break;
3623                                 case RELOC_SOFTC:
3624                                         new = (old & ~RELOC_MASK) + np->p_ncb;
3625                                         break;
3626 #ifdef  RELOC_KVAR
3627                                 case RELOC_KVAR:
3628                                         if (((old & ~RELOC_MASK) <
3629                                              SCRIPT_KVAR_FIRST) ||
3630                                             ((old & ~RELOC_MASK) >
3631                                              SCRIPT_KVAR_LAST))
3632                                                 panic("ncr KVAR out of range");
3633                                         new = vtophys(script_kvars[old &
3634                                             ~RELOC_MASK]);
3635                                         break;
3636 #endif
3637                                 case 0:
3638                                         /* Don't relocate a 0 address. */
3639                                         if (old == 0) {
3640                                                 new = old;
3641                                                 break;
3642                                         }
3643                                         /* fall through */
3644                                 default:
3645                                         panic("ncr_script_copy_and_bind: weird relocation %x\n", old);
3646                                         break;
3647                                 }
3648 
3649                                 *dst++ = cpu_to_scr(new);
3650                         }
3651                 } else
3652                         *dst++ = cpu_to_scr(*src++);
3653 
3654         }
3655 }
3656 
3657 /*
3658 **      Linux host data structure
3659 */
3660 
3661 struct host_data {
3662      struct ncb *ncb;
3663 };
3664 
3665 #define PRINT_ADDR(cmd, arg...) dev_info(&cmd->device->sdev_gendev , ## arg)
3666 
3667 static void ncr_print_msg(struct ccb *cp, char *label, u_char *msg)
3668 {
3669         PRINT_ADDR(cp->cmd, "%s: ", label);
3670 
3671         spi_print_msg(msg);
3672         printk("\n");
3673 }
3674 
3675 /*==========================================================
3676 **
3677 **      NCR chip clock divisor table.
3678 **      Divisors are multiplied by 10,000,000 in order to make 
3679 **      calculations more simple.
3680 **
3681 **==========================================================
3682 */
3683 
3684 #define _5M 5000000
3685 static u_long div_10M[] =
3686         {2*_5M, 3*_5M, 4*_5M, 6*_5M, 8*_5M, 12*_5M, 16*_5M};
3687 
3688 
3689 /*===============================================================
3690 **
3691 **      Prepare io register values used by ncr_init() according 
3692 **      to selected and supported features.
3693 **
3694 **      NCR chips allow burst lengths of 2, 4, 8, 16, 32, 64, 128 
3695 **      transfers. 32,64,128 are only supported by 875 and 895 chips.
3696 **      We use log base 2 (burst length) as internal code, with 
3697 **      value 0 meaning "burst disabled".
3698 **
3699 **===============================================================
3700 */
3701 
3702 /*
3703  *      Burst length from burst code.
3704  */
3705 #define burst_length(bc) (!(bc))? 0 : 1 << (bc)
3706 
3707 /*
3708  *      Burst code from io register bits.  Burst enable is ctest0 for c720
3709  */
3710 #define burst_code(dmode, ctest0) \
3711         (ctest0) & 0x80 ? 0 : (((dmode) & 0xc0) >> 6) + 1
3712 
3713 /*
3714  *      Set initial io register bits from burst code.
3715  */
3716 static inline void ncr_init_burst(struct ncb *np, u_char bc)
3717 {
3718         u_char *be = &np->rv_ctest0;
3719         *be             &= ~0x80;
3720         np->rv_dmode    &= ~(0x3 << 6);
3721         np->rv_ctest5   &= ~0x4;
3722 
3723         if (!bc) {
3724                 *be             |= 0x80;
3725         } else {
3726                 --bc;
3727                 np->rv_dmode    |= ((bc & 0x3) << 6);
3728                 np->rv_ctest5   |= (bc & 0x4);
3729         }
3730 }
3731 
3732 static void __init ncr_prepare_setting(struct ncb *np)
3733 {
3734         u_char  burst_max;
3735         u_long  period;
3736         int i;
3737 
3738         /*
3739         **      Save assumed BIOS setting
3740         */
3741 
3742         np->sv_scntl0   = INB(nc_scntl0) & 0x0a;
3743         np->sv_scntl3   = INB(nc_scntl3) & 0x07;
3744         np->sv_dmode    = INB(nc_dmode)  & 0xce;
3745         np->sv_dcntl    = INB(nc_dcntl)  & 0xa8;
3746         np->sv_ctest0   = INB(nc_ctest0) & 0x84;
3747         np->sv_ctest3   = INB(nc_ctest3) & 0x01;
3748         np->sv_ctest4   = INB(nc_ctest4) & 0x80;
3749         np->sv_ctest5   = INB(nc_ctest5) & 0x24;
3750         np->sv_gpcntl   = INB(nc_gpcntl);
3751         np->sv_stest2   = INB(nc_stest2) & 0x20;
3752         np->sv_stest4   = INB(nc_stest4);
3753 
3754         /*
3755         **      Wide ?
3756         */
3757 
3758         np->maxwide     = (np->features & FE_WIDE)? 1 : 0;
3759 
3760         /*
3761          *  Guess the frequency of the chip's clock.
3762          */
3763         if (np->features & FE_ULTRA)
3764                 np->clock_khz = 80000;
3765         else
3766                 np->clock_khz = 40000;
3767 
3768         /*
3769          *  Get the clock multiplier factor.
3770          */
3771         if      (np->features & FE_QUAD)
3772                 np->multiplier  = 4;
3773         else if (np->features & FE_DBLR)
3774                 np->multiplier  = 2;
3775         else
3776                 np->multiplier  = 1;
3777 
3778         /*
3779          *  Measure SCSI clock frequency for chips 
3780          *  it may vary from assumed one.
3781          */
3782         if (np->features & FE_VARCLK)
3783                 ncr_getclock(np, np->multiplier);
3784 
3785         /*
3786          * Divisor to be used for async (timer pre-scaler).
3787          */
3788         i = np->clock_divn - 1;
3789         while (--i >= 0) {
3790                 if (10ul * SCSI_NCR_MIN_ASYNC * np->clock_khz > div_10M[i]) {
3791                         ++i;
3792                         break;
3793                 }
3794         }
3795         np->rv_scntl3 = i+1;
3796 
3797         /*
3798          * Minimum synchronous period factor supported by the chip.
3799          * Btw, 'period' is in tenths of nanoseconds.
3800          */
3801 
3802         period = (4 * div_10M[0] + np->clock_khz - 1) / np->clock_khz;
3803         if      (period <= 250)         np->minsync = 10;
3804         else if (period <= 303)         np->minsync = 11;
3805         else if (period <= 500)         np->minsync = 12;
3806         else                            np->minsync = (period + 40 - 1) / 40;
3807 
3808         /*
3809          * Check against chip SCSI standard support (SCSI-2,ULTRA,ULTRA2).
3810          */
3811 
3812         if      (np->minsync < 25 && !(np->features & FE_ULTRA))
3813                 np->minsync = 25;
3814 
3815         /*
3816          * Maximum synchronous period factor supported by the chip.
3817          */
3818 
3819         period = (11 * div_10M[np->clock_divn - 1]) / (4 * np->clock_khz);
3820         np->maxsync = period > 2540 ? 254 : period / 10;
3821 
3822         /*
3823         **      Prepare initial value of other IO registers
3824         */
3825 #if defined SCSI_NCR_TRUST_BIOS_SETTING
3826         np->rv_scntl0   = np->sv_scntl0;
3827         np->rv_dmode    = np->sv_dmode;
3828         np->rv_dcntl    = np->sv_dcntl;
3829         np->rv_ctest0   = np->sv_ctest0;
3830         np->rv_ctest3   = np->sv_ctest3;
3831         np->rv_ctest4   = np->sv_ctest4;
3832         np->rv_ctest5   = np->sv_ctest5;
3833         burst_max       = burst_code(np->sv_dmode, np->sv_ctest0);
3834 #else
3835 
3836         /*
3837         **      Select burst length (dwords)
3838         */
3839         burst_max       = driver_setup.burst_max;
3840         if (burst_max == 255)
3841                 burst_max = burst_code(np->sv_dmode, np->sv_ctest0);
3842         if (burst_max > 7)
3843                 burst_max = 7;
3844         if (burst_max > np->maxburst)
3845                 burst_max = np->maxburst;
3846 
3847         /*
3848         **      Select all supported special features
3849         */
3850         if (np->features & FE_ERL)
3851                 np->rv_dmode    |= ERL;         /* Enable Read Line */
3852         if (np->features & FE_BOF)
3853                 np->rv_dmode    |= BOF;         /* Burst Opcode Fetch */
3854         if (np->features & FE_ERMP)
3855                 np->rv_dmode    |= ERMP;        /* Enable Read Multiple */
3856         if (np->features & FE_PFEN)
3857                 np->rv_dcntl    |= PFEN;        /* Prefetch Enable */
3858         if (np->features & FE_CLSE)
3859                 np->rv_dcntl    |= CLSE;        /* Cache Line Size Enable */
3860         if (np->features & FE_WRIE)
3861                 np->rv_ctest3   |= WRIE;        /* Write and Invalidate */
3862         if (np->features & FE_DFS)
3863                 np->rv_ctest5   |= DFS;         /* Dma Fifo Size */
3864         if (np->features & FE_MUX)
3865                 np->rv_ctest4   |= MUX;         /* Host bus multiplex mode */
3866         if (np->features & FE_EA)
3867                 np->rv_dcntl    |= EA;          /* Enable ACK */
3868         if (np->features & FE_EHP)
3869                 np->rv_ctest0   |= EHP;         /* Even host parity */
3870 
3871         /*
3872         **      Select some other
3873         */
3874         if (driver_setup.master_parity)
3875                 np->rv_ctest4   |= MPEE;        /* Master parity checking */
3876         if (driver_setup.scsi_parity)
3877                 np->rv_scntl0   |= 0x0a;        /*  full arb., ena parity, par->ATN  */
3878 
3879         /*
3880         **  Get SCSI addr of host adapter (set by bios?).
3881         */
3882         if (np->myaddr == 255) {
3883                 np->myaddr = INB(nc_scid) & 0x07;
3884                 if (!np->myaddr)
3885                         np->myaddr = SCSI_NCR_MYADDR;
3886         }
3887 
3888 #endif /* SCSI_NCR_TRUST_BIOS_SETTING */
3889 
3890         /*
3891          *      Prepare initial io register bits for burst length
3892          */
3893         ncr_init_burst(np, burst_max);
3894 
3895         /*
3896         **      Set SCSI BUS mode.
3897         **
3898         **      - ULTRA2 chips (895/895A/896) report the current 
3899         **        BUS mode through the STEST4 IO register.
3900         **      - For previous generation chips (825/825A/875), 
3901         **        user has to tell us how to check against HVD, 
3902         **        since a 100% safe algorithm is not possible.
3903         */
3904         np->scsi_mode = SMODE_SE;
3905         if (np->features & FE_DIFF) {
3906                 switch(driver_setup.diff_support) {
3907                 case 4: /* Trust previous settings if present, then GPIO3 */
3908                         if (np->sv_scntl3) {
3909                                 if (np->sv_stest2 & 0x20)
3910                                         np->scsi_mode = SMODE_HVD;
3911                                 break;
3912                         }
3913                         /* fall through */
3914                 case 3: /* SYMBIOS controllers report HVD through GPIO3 */
3915                         if (INB(nc_gpreg) & 0x08)
3916                                 break;
3917                         /* fall through */
3918                 case 2: /* Set HVD unconditionally */
3919                         np->scsi_mode = SMODE_HVD;
3920                         /* fall through */
3921                 case 1: /* Trust previous settings for HVD */
3922                         if (np->sv_stest2 & 0x20)
3923                                 np->scsi_mode = SMODE_HVD;
3924                         break;
3925                 default:/* Don't care about HVD */      
3926                         break;
3927                 }
3928         }
3929         if (np->scsi_mode == SMODE_HVD)
3930                 np->rv_stest2 |= 0x20;
3931 
3932         /*
3933         **      Set LED support from SCRIPTS.
3934         **      Ignore this feature for boards known to use a 
3935         **      specific GPIO wiring and for the 895A or 896 
3936         **      that drive the LED directly.
3937         **      Also probe initial setting of GPIO0 as output.
3938         */
3939         if ((driver_setup.led_pin) &&
3940             !(np->features & FE_LEDC) && !(np->sv_gpcntl & 0x01))
3941                 np->features |= FE_LED0;
3942 
3943         /*
3944         **      Set irq mode.
3945         */
3946         switch(driver_setup.irqm & 3) {
3947         case 2:
3948                 np->rv_dcntl    |= IRQM;
3949                 break;
3950         case 1:
3951                 np->rv_dcntl    |= (np->sv_dcntl & IRQM);
3952                 break;
3953         default:
3954                 break;
3955         }
3956 
3957         /*
3958         **      Configure targets according to driver setup.
3959         **      Allow to override sync, wide and NOSCAN from 
3960         **      boot command line.
3961         */
3962         for (i = 0 ; i < MAX_TARGET ; i++) {
3963                 struct tcb *tp = &np->target[i];
3964 
3965                 tp->usrsync = driver_setup.default_sync;
3966                 tp->usrwide = driver_setup.max_wide;
3967                 tp->usrtags = MAX_TAGS;
3968                 tp->period = 0xffff;
3969                 if (!driver_setup.disconnection)
3970                         np->target[i].usrflag = UF_NODISC;
3971         }
3972 
3973         /*
3974         **      Announce all that stuff to user.
3975         */
3976 
3977         printk(KERN_INFO "%s: ID %d, Fast-%d%s%s\n", ncr_name(np),
3978                 np->myaddr,
3979                 np->minsync < 12 ? 40 : (np->minsync < 25 ? 20 : 10),
3980                 (np->rv_scntl0 & 0xa)   ? ", Parity Checking"   : ", NO Parity",
3981                 (np->rv_stest2 & 0x20)  ? ", Differential"      : "");
3982 
3983         if (bootverbose > 1) {
3984                 printk (KERN_INFO "%s: initial SCNTL3/DMODE/DCNTL/CTEST3/4/5 = "
3985                         "(hex) %02x/%02x/%02x/%02x/%02x/%02x\n",
3986                         ncr_name(np), np->sv_scntl3, np->sv_dmode, np->sv_dcntl,
3987                         np->sv_ctest3, np->sv_ctest4, np->sv_ctest5);
3988 
3989                 printk (KERN_INFO "%s: final   SCNTL3/DMODE/DCNTL/CTEST3/4/5 = "
3990                         "(hex) %02x/%02x/%02x/%02x/%02x/%02x\n",
3991                         ncr_name(np), np->rv_scntl3, np->rv_dmode, np->rv_dcntl,
3992                         np->rv_ctest3, np->rv_ctest4, np->rv_ctest5);
3993         }
3994 
3995         if (bootverbose && np->paddr2)
3996                 printk (KERN_INFO "%s: on-chip RAM at 0x%lx\n",
3997                         ncr_name(np), np->paddr2);
3998 }
3999 
4000 /*==========================================================
4001 **
4002 **
4003 **      Done SCSI commands list management.
4004 **
4005 **      We donnot enter the scsi_done() callback immediately 
4006 **      after a command has been seen as completed but we 
4007 **      insert it into a list which is flushed outside any kind 
4008 **      of driver critical section.
4009 **      This allows to do minimal stuff under interrupt and 
4010 **      inside critical sections and to also avoid locking up 
4011 **      on recursive calls to driver entry points under SMP.
4012 **      In fact, the only kernel point which is entered by the 
4013 **      driver with a driver lock set is kmalloc(GFP_ATOMIC) 
4014 **      that shall not reenter the driver under any circumstances,
4015 **      AFAIK.
4016 **
4017 **==========================================================
4018 */
4019 static inline void ncr_queue_done_cmd(struct ncb *np, struct scsi_cmnd *cmd)
4020 {
4021         unmap_scsi_data(np, cmd);
4022         cmd->host_scribble = (char *) np->done_list;
4023         np->done_list = cmd;
4024 }
4025 
4026 static inline void ncr_flush_done_cmds(struct scsi_cmnd *lcmd)
4027 {
4028         struct scsi_cmnd *cmd;
4029 
4030         while (lcmd) {
4031                 cmd = lcmd;
4032                 lcmd = (struct scsi_cmnd *) cmd->host_scribble;
4033                 cmd->scsi_done(cmd);
4034         }
4035 }
4036 
4037 /*==========================================================
4038 **
4039 **
4040 **      Prepare the next negotiation message if needed.
4041 **
4042 **      Fill in the part of message buffer that contains the 
4043 **      negotiation and the nego_status field of the CCB.
4044 **      Returns the size of the message in bytes.
4045 **
4046 **
4047 **==========================================================
4048 */
4049 
4050 
4051 static int ncr_prepare_nego(struct ncb *np, struct ccb *cp, u_char *msgptr)
4052 {
4053         struct tcb *tp = &np->target[cp->target];
4054         int msglen = 0;
4055         int nego = 0;
4056         struct scsi_target *starget = tp->starget;
4057 
4058         /* negotiate wide transfers ?  */
4059         if (!tp->widedone) {
4060                 if (spi_support_wide(starget)) {
4061                         nego = NS_WIDE;
4062                 } else
4063                         tp->widedone=1;
4064         }
4065 
4066         /* negotiate synchronous transfers?  */
4067         if (!nego && !tp->period) {
4068                 if (spi_support_sync(starget)) {
4069                         nego = NS_SYNC;
4070                 } else {
4071                         tp->period  =0xffff;
4072                         dev_info(&starget->dev, "target did not report SYNC.\n");
4073                 }
4074         }
4075 
4076         switch (nego) {
4077         case NS_SYNC:
4078                 msglen += spi_populate_sync_msg(msgptr + msglen,
4079                                 tp->maxoffs ? tp->minsync : 0, tp->maxoffs);
4080                 break;
4081         case NS_WIDE:
4082                 msglen += spi_populate_width_msg(msgptr + msglen, tp->usrwide);
4083                 break;
4084         }
4085 
4086         cp->nego_status = nego;
4087 
4088         if (nego) {
4089                 tp->nego_cp = cp;
4090                 if (DEBUG_FLAGS & DEBUG_NEGO) {
4091                         ncr_print_msg(cp, nego == NS_WIDE ?
4092                                           "wide msgout":"sync_msgout", msgptr);
4093                 }
4094         }
4095 
4096         return msglen;
4097 }
4098 
4099 
4100 
4101 /*==========================================================
4102 **
4103 **
4104 **      Start execution of a SCSI command.
4105 **      This is called from the generic SCSI driver.
4106 **
4107 **
4108 **==========================================================
4109 */
4110 static int ncr_queue_command (struct ncb *np, struct scsi_cmnd *cmd)
4111 {
4112         struct scsi_device *sdev = cmd->device;
4113         struct tcb *tp = &np->target[sdev->id];
4114         struct lcb *lp = tp->lp[sdev->lun];
4115         struct ccb *cp;
4116 
4117         int     segments;
4118         u_char  idmsg, *msgptr;
4119         u32     msglen;
4120         int     direction;
4121         u32     lastp, goalp;
4122 
4123         /*---------------------------------------------
4124         **
4125         **      Some shortcuts ...
4126         **
4127         **---------------------------------------------
4128         */
4129         if ((sdev->id == np->myaddr       ) ||
4130                 (sdev->id >= MAX_TARGET) ||
4131                 (sdev->lun    >= MAX_LUN   )) {
4132                 return(DID_BAD_TARGET);
4133         }
4134 
4135         /*---------------------------------------------
4136         **
4137         **      Complete the 1st TEST UNIT READY command
4138         **      with error condition if the device is 
4139         **      flagged NOSCAN, in order to speed up 
4140         **      the boot.
4141         **
4142         **---------------------------------------------
4143         */
4144         if ((cmd->cmnd[0] == 0 || cmd->cmnd[0] == 0x12) && 
4145             (tp->usrflag & UF_NOSCAN)) {
4146                 tp->usrflag &= ~UF_NOSCAN;
4147                 return DID_BAD_TARGET;
4148         }
4149 
4150         if (DEBUG_FLAGS & DEBUG_TINY) {
4151                 PRINT_ADDR(cmd, "CMD=%x ", cmd->cmnd[0]);
4152         }
4153 
4154         /*---------------------------------------------------
4155         **
4156         **      Assign a ccb / bind cmd.
4157         **      If resetting, shorten settle_time if necessary
4158         **      in order to avoid spurious timeouts.
4159         **      If resetting or no free ccb,
4160         **      insert cmd into the waiting list.
4161         **
4162         **----------------------------------------------------
4163         */
4164         if (np->settle_time && cmd->request->timeout >= HZ) {
4165                 u_long tlimit = jiffies + cmd->request->timeout - HZ;
4166                 if (time_after(np->settle_time, tlimit))
4167                         np->settle_time = tlimit;
4168         }
4169 
4170         if (np->settle_time || !(cp=ncr_get_ccb (np, cmd))) {
4171                 insert_into_waiting_list(np, cmd);
4172                 return(DID_OK);
4173         }
4174         cp->cmd = cmd;
4175 
4176         /*----------------------------------------------------
4177         **
4178         **      Build the identify / tag / sdtr message
4179         **
4180         **----------------------------------------------------
4181         */
4182 
4183         idmsg = IDENTIFY(0, sdev->lun);
4184 
4185         if (cp ->tag != NO_TAG ||
4186                 (cp != np->ccb && np->disc && !(tp->usrflag & UF_NODISC)))
4187                 idmsg |= 0x40;
4188 
4189         msgptr = cp->scsi_smsg;
4190         msglen = 0;
4191         msgptr[msglen++] = idmsg;
4192 
4193         if (cp->tag != NO_TAG) {
4194                 char order = np->order;
4195 
4196                 /*
4197                 **      Force ordered tag if necessary to avoid timeouts 
4198                 **      and to preserve interactivity.
4199                 */
4200                 if (lp && time_after(jiffies, lp->tags_stime)) {
4201                         if (lp->tags_smap) {
4202                                 order = ORDERED_QUEUE_TAG;
4203                                 if ((DEBUG_FLAGS & DEBUG_TAGS)||bootverbose>2){ 
4204                                         PRINT_ADDR(cmd,
4205                                                 "ordered tag forced.\n");
4206                                 }
4207                         }
4208                         lp->tags_stime = jiffies + 3*HZ;
4209                         lp->tags_smap = lp->tags_umap;
4210                 }
4211 
4212                 if (order == 0) {
4213                         /*
4214                         **      Ordered write ops, unordered read ops.
4215                         */
4216                         switch (cmd->cmnd[0]) {
4217                         case 0x08:  /* READ_SMALL (6) */
4218                         case 0x28:  /* READ_BIG  (10) */
4219                         case 0xa8:  /* READ_HUGE (12) */
4220                                 order = SIMPLE_QUEUE_TAG;
4221                                 break;
4222                         default:
4223                                 order = ORDERED_QUEUE_TAG;
4224                         }
4225                 }
4226                 msgptr[msglen++] = order;
4227                 /*
4228                 **      Actual tags are numbered 1,3,5,..2*MAXTAGS+1,
4229                 **      since we may have to deal with devices that have 
4230                 **      problems with #TAG 0 or too great #TAG numbers.
4231                 */
4232                 msgptr[msglen++] = (cp->tag << 1) + 1;
4233         }
4234 
4235         /*----------------------------------------------------
4236         **
4237         **      Build the data descriptors
4238         **
4239         **----------------------------------------------------
4240         */
4241 
4242         direction = cmd->sc_data_direction;
4243         if (direction != DMA_NONE) {
4244                 segments = ncr_scatter(np, cp, cp->cmd);
4245                 if (segments < 0) {
4246                         ncr_free_ccb(np, cp);
4247                         return(DID_ERROR);
4248                 }
4249         }
4250         else {
4251                 cp->data_len = 0;
4252                 segments = 0;
4253         }
4254 
4255         /*---------------------------------------------------
4256         **
4257         **      negotiation required?
4258         **
4259         **      (nego_status is filled by ncr_prepare_nego())
4260         **
4261         **---------------------------------------------------
4262         */
4263 
4264         cp->nego_status = 0;
4265 
4266         if ((!tp->widedone || !tp->period) && !tp->nego_cp && lp) {
4267                 msglen += ncr_prepare_nego (np, cp, msgptr + msglen);
4268         }
4269 
4270         /*----------------------------------------------------
4271         **
4272         **      Determine xfer direction.
4273         **
4274         **----------------------------------------------------
4275         */
4276         if (!cp->data_len)
4277                 direction = DMA_NONE;
4278 
4279         /*
4280         **      If data direction is BIDIRECTIONAL, speculate FROM_DEVICE
4281         **      but prepare alternate pointers for TO_DEVICE in case 
4282         **      of our speculation will be just wrong.
4283         **      SCRIPTS will swap values if needed.
4284         */
4285         switch(direction) {
4286         case DMA_BIDIRECTIONAL:
4287         case DMA_TO_DEVICE:
4288                 goalp = NCB_SCRIPT_PHYS (np, data_out2) + 8;
4289                 if (segments <= MAX_SCATTERL)
4290                         lastp = goalp - 8 - (segments * 16);
4291                 else {
4292                         lastp = NCB_SCRIPTH_PHYS (np, hdata_out2);
4293                         lastp -= (segments - MAX_SCATTERL) * 16;
4294                 }
4295                 if (direction != DMA_BIDIRECTIONAL)
4296                         break;
4297                 cp->phys.header.wgoalp  = cpu_to_scr(goalp);
4298                 cp->phys.header.wlastp  = cpu_to_scr(lastp);
4299                 /* fall through */
4300         case DMA_FROM_DEVICE:
4301                 goalp = NCB_SCRIPT_PHYS (np, data_in2) + 8;
4302                 if (segments <= MAX_SCATTERL)
4303                         lastp = goalp - 8 - (segments * 16);
4304                 else {
4305                         lastp = NCB_SCRIPTH_PHYS (np, hdata_in2);
4306                         lastp -= (segments - MAX_SCATTERL) * 16;
4307                 }
4308                 break;
4309         default:
4310         case DMA_NONE:
4311                 lastp = goalp = NCB_SCRIPT_PHYS (np, no_data);
4312                 break;
4313         }
4314 
4315         /*
4316         **      Set all pointers values needed by SCRIPTS.
4317         **      If direction is unknown, start at data_io.
4318         */
4319         cp->phys.header.lastp = cpu_to_scr(lastp);
4320         cp->phys.header.goalp = cpu_to_scr(goalp);
4321 
4322         if (direction == DMA_BIDIRECTIONAL)
4323                 cp->phys.header.savep = 
4324                         cpu_to_scr(NCB_SCRIPTH_PHYS (np, data_io));
4325         else
4326                 cp->phys.header.savep= cpu_to_scr(lastp);
4327 
4328         /*
4329         **      Save the initial data pointer in order to be able 
4330         **      to redo the command.
4331         */
4332         cp->startp = cp->phys.header.savep;
4333 
4334         /*----------------------------------------------------
4335         **
4336         **      fill in ccb
4337         **
4338         **----------------------------------------------------
4339         **
4340         **
4341         **      physical -> virtual backlink
4342         **      Generic SCSI command
4343         */
4344 
4345         /*
4346         **      Startqueue
4347         */
4348         cp->start.schedule.l_paddr   = cpu_to_scr(NCB_SCRIPT_PHYS (np, select));
4349         cp->restart.schedule.l_paddr = cpu_to_scr(NCB_SCRIPT_PHYS (np, resel_dsa));
4350         /*
4351         **      select
4352         */
4353         cp->phys.select.sel_id          = sdev_id(sdev);
4354         cp->phys.select.sel_scntl3      = tp->wval;
4355         cp->phys.select.sel_sxfer       = tp->sval;
4356         /*
4357         **      message
4358         */
4359         cp->phys.smsg.addr              = cpu_to_scr(CCB_PHYS (cp, scsi_smsg));
4360         cp->phys.smsg.size              = cpu_to_scr(msglen);
4361 
4362         /*
4363         **      command
4364         */
4365         memcpy(cp->cdb_buf, cmd->cmnd, min_t(int, cmd->cmd_len, sizeof(cp->cdb_buf)));
4366         cp->phys.cmd.addr               = cpu_to_scr(CCB_PHYS (cp, cdb_buf[0]));
4367         cp->phys.cmd.size               = cpu_to_scr(cmd->cmd_len);
4368 
4369         /*
4370         **      status
4371         */
4372         cp->actualquirks                = 0;
4373         cp->host_status                 = cp->nego_status ? HS_NEGOTIATE : HS_BUSY;
4374         cp->scsi_status                 = S_ILLEGAL;
4375         cp->parity_status               = 0;
4376 
4377         cp->xerr_status                 = XE_OK;
4378 #if 0
4379         cp->sync_status                 = tp->sval;
4380         cp->wide_status                 = tp->wval;
4381 #endif
4382 
4383         /*----------------------------------------------------
4384         **
4385         **      Critical region: start this job.
4386         **
4387         **----------------------------------------------------
4388         */
4389 
4390         /* activate this job.  */
4391         cp->magic               = CCB_MAGIC;
4392 
4393         /*
4394         **      insert next CCBs into start queue.
4395         **      2 max at a time is enough to flush the CCB wait queue.
4396         */
4397         cp->auto_sense = 0;
4398         if (lp)
4399                 ncr_start_next_ccb(np, lp, 2);
4400         else
4401                 ncr_put_start_queue(np, cp);
4402 
4403         /* Command is successfully queued.  */
4404 
4405         return DID_OK;
4406 }
4407 
4408 
4409 /*==========================================================
4410 **
4411 **
4412 **      Insert a CCB into the start queue and wake up the 
4413 **      SCRIPTS processor.
4414 **
4415 **
4416 **==========================================================
4417 */
4418 
4419 static void ncr_start_next_ccb(struct ncb *np, struct lcb *lp, int maxn)
4420 {
4421         struct list_head *qp;
4422         struct ccb *cp;
4423 
4424         if (lp->held_ccb)
4425                 return;
4426 
4427         while (maxn-- && lp->queuedccbs < lp->queuedepth) {
4428                 qp = ncr_list_pop(&lp->wait_ccbq);
4429                 if (!qp)
4430                         break;
4431                 ++lp->queuedccbs;
4432                 cp = list_entry(qp, struct ccb, link_ccbq);
4433                 list_add_tail(qp, &lp->busy_ccbq);
4434                 lp->jump_ccb[cp->tag == NO_TAG ? 0 : cp->tag] =
4435                         cpu_to_scr(CCB_PHYS (cp, restart));
4436                 ncr_put_start_queue(np, cp);
4437         }
4438 }
4439 
4440 static void ncr_put_start_queue(struct ncb *np, struct ccb *cp)
4441 {
4442         u16     qidx;
4443 
4444         /*
4445         **      insert into start queue.
4446         */
4447         if (!np->squeueput) np->squeueput = 1;
4448         qidx = np->squeueput + 2;
4449         if (qidx >= MAX_START + MAX_START) qidx = 1;
4450 
4451         np->scripth->tryloop [qidx] = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
4452         MEMORY_BARRIER();
4453         np->scripth->tryloop [np->squeueput] = cpu_to_scr(CCB_PHYS (cp, start));
4454 
4455         np->squeueput = qidx;
4456         ++np->queuedccbs;
4457         cp->queued = 1;
4458 
4459         if (DEBUG_FLAGS & DEBUG_QUEUE)
4460                 printk ("%s: queuepos=%d.\n", ncr_name (np), np->squeueput);
4461 
4462         /*
4463         **      Script processor may be waiting for reselect.
4464         **      Wake it up.
4465         */
4466         MEMORY_BARRIER();
4467         OUTB (nc_istat, SIGP);
4468 }
4469 
4470 
4471 static int ncr_reset_scsi_bus(struct ncb *np, int enab_int, int settle_delay)
4472 {
4473         u32 term;
4474         int retv = 0;
4475 
4476         np->settle_time = jiffies + settle_delay * HZ;
4477 
4478         if (bootverbose > 1)
4479                 printk("%s: resetting, "
4480                         "command processing suspended for %d seconds\n",
4481                         ncr_name(np), settle_delay);
4482 
4483         ncr_chip_reset(np, 100);
4484         udelay(2000);   /* The 895 needs time for the bus mode to settle */
4485         if (enab_int)
4486                 OUTW (nc_sien, RST);
4487         /*
4488         **      Enable Tolerant, reset IRQD if present and 
4489         **      properly set IRQ mode, prior to resetting the bus.
4490         */
4491         OUTB (nc_stest3, TE);
4492         OUTB (nc_scntl1, CRST);
4493         udelay(200);
4494 
4495         if (!driver_setup.bus_check)
4496                 goto out;
4497         /*
4498         **      Check for no terminators or SCSI bus shorts to ground.
4499         **      Read SCSI data bus, data parity bits and control signals.
4500         **      We are expecting RESET to be TRUE and other signals to be 
4501         **      FALSE.
4502         */
4503 
4504         term =  INB(nc_sstat0);
4505         term =  ((term & 2) << 7) + ((term & 1) << 17); /* rst sdp0 */
4506         term |= ((INB(nc_sstat2) & 0x01) << 26) |       /* sdp1     */
4507                 ((INW(nc_sbdl) & 0xff)   << 9)  |       /* d7-0     */
4508                 ((INW(nc_sbdl) & 0xff00) << 10) |       /* d15-8    */
4509                 INB(nc_sbcl);   /* req ack bsy sel atn msg cd io    */
4510 
4511         if (!(np->features & FE_WIDE))
4512                 term &= 0x3ffff;
4513 
4514         if (term != (2<<7)) {
4515                 printk("%s: suspicious SCSI data while resetting the BUS.\n",
4516                         ncr_name(np));
4517                 printk("%s: %sdp0,d7-0,rst,req,ack,bsy,sel,atn,msg,c/d,i/o = "
4518                         "0x%lx, expecting 0x%lx\n",
4519                         ncr_name(np),
4520                         (np->features & FE_WIDE) ? "dp1,d15-8," : "",
4521                         (u_long)term, (u_long)(2<<7));
4522                 if (driver_setup.bus_check == 1)
4523                         retv = 1;
4524         }
4525 out:
4526         OUTB (nc_scntl1, 0);
4527         return retv;
4528 }
4529 
4530 /*
4531  * Start reset process.
4532  * If reset in progress do nothing.
4533  * The interrupt handler will reinitialize the chip.
4534  * The timeout handler will wait for settle_time before 
4535  * clearing it and so resuming command processing.
4536  */
4537 static void ncr_start_reset(struct ncb *np)
4538 {
4539         if (!np->settle_time) {
4540                 ncr_reset_scsi_bus(np, 1, driver_setup.settle_delay);
4541         }
4542 }
4543  
4544 /*==========================================================
4545 **
4546 **
4547 **      Reset the SCSI BUS.
4548 **      This is called from the generic SCSI driver.
4549 **
4550 **
4551 **==========================================================
4552 */
4553 static int ncr_reset_bus (struct ncb *np, struct scsi_cmnd *cmd, int sync_reset)
4554 {
4555 /*      struct scsi_device        *device    = cmd->device; */
4556         struct ccb *cp;
4557         int found;
4558 
4559 /*
4560  * Return immediately if reset is in progress.
4561  */
4562         if (np->settle_time) {
4563                 return FAILED;
4564         }
4565 /*
4566  * Start the reset process.
4567  * The script processor is then assumed to be stopped.
4568  * Commands will now be queued in the waiting list until a settle 
4569  * delay of 2 seconds will be completed.
4570  */
4571         ncr_start_reset(np);
4572 /*
4573  * First, look in the wakeup list
4574  */
4575         for (found=0, cp=np->ccb; cp; cp=cp->link_ccb) {
4576                 /*
4577                 **      look for the ccb of this command.
4578                 */
4579                 if (cp->host_status == HS_IDLE) continue;
4580                 if (cp->cmd == cmd) {
4581                         found = 1;
4582                         break;
4583                 }
4584         }
4585 /*
4586  * Then, look in the waiting list
4587  */
4588         if (!found && retrieve_from_waiting_list(0, np, cmd))
4589                 found = 1;
4590 /*
4591  * Wake-up all awaiting commands with DID_RESET.
4592  */
4593         reset_waiting_list(np);
4594 /*
4595  * Wake-up all pending commands with HS_RESET -> DID_RESET.
4596  */
4597         ncr_wakeup(np, HS_RESET);
4598 /*
4599  * If the involved command was not in a driver queue, and the 
4600  * scsi driver told us reset is synchronous, and the command is not 
4601  * currently in the waiting list, complete it with DID_RESET status,
4602  * in order to keep it alive.
4603  */
4604         if (!found && sync_reset && !retrieve_from_waiting_list(0, np, cmd)) {
4605                 cmd->result = DID_RESET << 16;
4606                 ncr_queue_done_cmd(np, cmd);
4607         }
4608 
4609         return SUCCESS;
4610 }
4611 
4612 #if 0 /* unused and broken.. */
4613 /*==========================================================
4614 **
4615 **
4616 **      Abort an SCSI command.
4617 **      This is called from the generic SCSI driver.
4618 **
4619 **
4620 **==========================================================
4621 */
4622 static int ncr_abort_command (struct ncb *np, struct scsi_cmnd *cmd)
4623 {
4624 /*      struct scsi_device        *device    = cmd->device; */
4625         struct ccb *cp;
4626         int found;
4627         int retv;
4628 
4629 /*
4630  * First, look for the scsi command in the waiting list
4631  */
4632         if (remove_from_waiting_list(np, cmd)) {
4633                 cmd->result = ScsiResult(DID_ABORT, 0);
4634                 ncr_queue_done_cmd(np, cmd);
4635                 return SCSI_ABORT_SUCCESS;
4636         }
4637 
4638 /*
4639  * Then, look in the wakeup list
4640  */
4641         for (found=0, cp=np->ccb; cp; cp=cp->link_ccb) {
4642                 /*
4643                 **      look for the ccb of this command.
4644                 */
4645                 if (cp->host_status == HS_IDLE) continue;
4646                 if (cp->cmd == cmd) {
4647                         found = 1;
4648                         break;
4649                 }
4650         }
4651 
4652         if (!found) {
4653                 return SCSI_ABORT_NOT_RUNNING;
4654         }
4655 
4656         if (np->settle_time) {
4657                 return SCSI_ABORT_SNOOZE;
4658         }
4659 
4660         /*
4661         **      If the CCB is active, patch schedule jumps for the 
4662         **      script to abort the command.
4663         */
4664 
4665         switch(cp->host_status) {
4666         case HS_BUSY:
4667         case HS_NEGOTIATE:
4668                 printk ("%s: abort ccb=%p (cancel)\n", ncr_name (np), cp);
4669                         cp->start.schedule.l_paddr =
4670                                 cpu_to_scr(NCB_SCRIPTH_PHYS (np, cancel));
4671                 retv = SCSI_ABORT_PENDING;
4672                 break;
4673         case HS_DISCONNECT:
4674                 cp->restart.schedule.l_paddr =
4675                                 cpu_to_scr(NCB_SCRIPTH_PHYS (np, abort));
4676                 retv = SCSI_ABORT_PENDING;
4677                 break;
4678         default:
4679                 retv = SCSI_ABORT_NOT_RUNNING;
4680                 break;
4681 
4682         }
4683 
4684         /*
4685         **      If there are no requests, the script
4686         **      processor will sleep on SEL_WAIT_RESEL.
4687         **      Let's wake it up, since it may have to work.
4688         */
4689         OUTB (nc_istat, SIGP);
4690 
4691         return retv;
4692 }
4693 #endif
4694 
4695 static void ncr_detach(struct ncb *np)
4696 {
4697         struct ccb *cp;
4698         struct tcb *tp;
4699         struct lcb *lp;
4700         int target, lun;
4701         int i;
4702         char inst_name[16];
4703 
4704         /* Local copy so we don't access np after freeing it! */
4705         strlcpy(inst_name, ncr_name(np), sizeof(inst_name));
4706 
4707         printk("%s: releasing host resources\n", ncr_name(np));
4708 
4709 /*
4710 **      Stop the ncr_timeout process
4711 **      Set release_stage to 1 and wait that ncr_timeout() set it to 2.
4712 */
4713 
4714 #ifdef DEBUG_NCR53C8XX
4715         printk("%s: stopping the timer\n", ncr_name(np));
4716 #endif
4717         np->release_stage = 1;
4718         for (i = 50 ; i && np->release_stage != 2 ; i--)
4719                 mdelay(100);
4720         if (np->release_stage != 2)
4721                 printk("%s: the timer seems to be already stopped\n", ncr_name(np));
4722         else np->release_stage = 2;
4723 
4724 /*
4725 **      Disable chip interrupts
4726 */
4727 
4728 #ifdef DEBUG_NCR53C8XX
4729         printk("%s: disabling chip interrupts\n", ncr_name(np));
4730 #endif
4731         OUTW (nc_sien , 0);
4732         OUTB (nc_dien , 0);
4733 
4734         /*
4735         **      Reset NCR chip
4736         **      Restore bios setting for automatic clock detection.
4737         */
4738 
4739         printk("%s: resetting chip\n", ncr_name(np));
4740         ncr_chip_reset(np, 100);
4741 
4742         OUTB(nc_dmode,  np->sv_dmode);
4743         OUTB(nc_dcntl,  np->sv_dcntl);
4744         OUTB(nc_ctest0, np->sv_ctest0);
4745         OUTB(nc_ctest3, np->sv_ctest3);
4746         OUTB(nc_ctest4, np->sv_ctest4);
4747         OUTB(nc_ctest5, np->sv_ctest5);
4748         OUTB(nc_gpcntl, np->sv_gpcntl);
4749         OUTB(nc_stest2, np->sv_stest2);
4750 
4751         ncr_selectclock(np, np->sv_scntl3);
4752 
4753         /*
4754         **      Free allocated ccb(s)
4755         */
4756 
4757         while ((cp=np->ccb->link_ccb) != NULL) {
4758                 np->ccb->link_ccb = cp->link_ccb;
4759                 if (cp->host_status) {
4760                 printk("%s: shall free an active ccb (host_status=%d)\n",
4761                         ncr_name(np), cp->host_status);
4762                 }
4763 #ifdef DEBUG_NCR53C8XX
4764         printk("%s: freeing ccb (%lx)\n", ncr_name(np), (u_long) cp);
4765 #endif
4766                 m_free_dma(cp, sizeof(*cp), "CCB");
4767         }
4768 
4769         /* Free allocated tp(s) */
4770 
4771         for (target = 0; target < MAX_TARGET ; target++) {
4772                 tp=&np->target[target];
4773                 for (lun = 0 ; lun < MAX_LUN ; lun++) {
4774                         lp = tp->lp[lun];
4775                         if (lp) {
4776 #ifdef DEBUG_NCR53C8XX
4777         printk("%s: freeing lp (%lx)\n", ncr_name(np), (u_long) lp);
4778 #endif
4779                                 if (lp->jump_ccb != &lp->jump_ccb_0)
4780                                         m_free_dma(lp->jump_ccb,256,"JUMP_CCB");
4781                                 m_free_dma(lp, sizeof(*lp), "LCB");
4782                         }
4783                 }
4784         }
4785 
4786         if (np->scripth0)
4787                 m_free_dma(np->scripth0, sizeof(struct scripth), "SCRIPTH");
4788         if (np->script0)
4789                 m_free_dma(np->script0, sizeof(struct script), "SCRIPT");
4790         if (np->ccb)
4791                 m_free_dma(np->ccb, sizeof(struct ccb), "CCB");
4792         m_free_dma(np, sizeof(struct ncb), "NCB");
4793 
4794         printk("%s: host resources successfully released\n", inst_name);
4795 }
4796 
4797 /*==========================================================
4798 **
4799 **
4800 **      Complete execution of a SCSI command.
4801 **      Signal completion to the generic SCSI driver.
4802 **
4803 **
4804 **==========================================================
4805 */
4806 
4807 void ncr_complete (struct ncb *np, struct ccb *cp)
4808 {
4809         struct scsi_cmnd *cmd;
4810         struct tcb *tp;
4811         struct lcb *lp;
4812 
4813         /*
4814         **      Sanity check
4815         */
4816 
4817         if (!cp || cp->magic != CCB_MAGIC || !cp->cmd)
4818                 return;
4819 
4820         /*
4821         **      Print minimal debug information.
4822         */
4823 
4824         if (DEBUG_FLAGS & DEBUG_TINY)
4825                 printk ("CCB=%lx STAT=%x/%x\n", (unsigned long)cp,
4826                         cp->host_status,cp->scsi_status);
4827 
4828         /*
4829         **      Get command, target and lun pointers.
4830         */
4831 
4832         cmd = cp->cmd;
4833         cp->cmd = NULL;
4834         tp = &np->target[cmd->device->id];
4835         lp = tp->lp[cmd->device->lun];
4836 
4837         /*
4838         **      We donnot queue more than 1 ccb per target 
4839         **      with negotiation at any time. If this ccb was 
4840         **      used for negotiation, clear this info in the tcb.
4841         */
4842 
4843         if (cp == tp->nego_cp)
4844                 tp->nego_cp = NULL;
4845 
4846         /*
4847         **      If auto-sense performed, change scsi status.
4848         */
4849         if (cp->auto_sense) {
4850                 cp->scsi_status = cp->auto_sense;
4851         }
4852 
4853         /*
4854         **      If we were recovering from queue full or performing 
4855         **      auto-sense, requeue skipped CCBs to the wait queue.
4856         */
4857 
4858         if (lp && lp->held_ccb) {
4859                 if (cp == lp->held_ccb) {
4860                         list_splice_init(&lp->skip_ccbq, &lp->wait_ccbq);
4861                         lp->held_ccb = NULL;
4862                 }
4863         }
4864 
4865         /*
4866         **      Check for parity errors.
4867         */
4868 
4869         if (cp->parity_status > 1) {
4870                 PRINT_ADDR(cmd, "%d parity error(s).\n",cp->parity_status);
4871         }
4872 
4873         /*
4874         **      Check for extended errors.
4875         */
4876 
4877         if (cp->xerr_status != XE_OK) {
4878                 switch (cp->xerr_status) {
4879                 case XE_EXTRA_DATA:
4880                         PRINT_ADDR(cmd, "extraneous data discarded.\n");
4881                         break;
4882                 case XE_BAD_PHASE:
4883                         PRINT_ADDR(cmd, "invalid scsi phase (4/5).\n");
4884                         break;
4885                 default:
4886                         PRINT_ADDR(cmd, "extended error %d.\n",
4887                                         cp->xerr_status);
4888                         break;
4889                 }
4890                 if (cp->host_status==HS_COMPLETE)
4891                         cp->host_status = HS_FAIL;
4892         }
4893 
4894         /*
4895         **      Print out any error for debugging purpose.
4896         */
4897         if (DEBUG_FLAGS & (DEBUG_RESULT|DEBUG_TINY)) {
4898                 if (cp->host_status!=HS_COMPLETE || cp->scsi_status!=S_GOOD) {
4899                         PRINT_ADDR(cmd, "ERROR: cmd=%x host_status=%x "
4900                                         "scsi_status=%x\n", cmd->cmnd[0],
4901                                         cp->host_status, cp->scsi_status);
4902                 }
4903         }
4904 
4905         /*
4906         **      Check the status.
4907         */
4908         if (   (cp->host_status == HS_COMPLETE)
4909                 && (cp->scsi_status == S_GOOD ||
4910                     cp->scsi_status == S_COND_MET)) {
4911                 /*
4912                  *      All went well (GOOD status).
4913                  *      CONDITION MET status is returned on 
4914                  *      `Pre-Fetch' or `Search data' success.
4915                  */
4916                 cmd->result = ScsiResult(DID_OK, cp->scsi_status);
4917 
4918                 /*
4919                 **      @RESID@
4920                 **      Could dig out the correct value for resid,
4921                 **      but it would be quite complicated.
4922                 */
4923                 /* if (cp->phys.header.lastp != cp->phys.header.goalp) */
4924 
4925                 /*
4926                 **      Allocate the lcb if not yet.
4927                 */
4928                 if (!lp)
4929                         ncr_alloc_lcb (np, cmd->device->id, cmd->device->lun);
4930 
4931                 tp->bytes     += cp->data_len;
4932                 tp->transfers ++;
4933 
4934                 /*
4935                 **      If tags was reduced due to queue full,
4936                 **      increase tags if 1000 good status received.
4937                 */
4938                 if (lp && lp->usetags && lp->numtags < lp->maxtags) {
4939                         ++lp->num_good;
4940                         if (lp->num_good >= 1000) {
4941                                 lp->num_good = 0;
4942                                 ++lp->numtags;
4943                                 ncr_setup_tags (np, cmd->device);
4944                         }
4945                 }
4946         } else if ((cp->host_status == HS_COMPLETE)
4947                 && (cp->scsi_status == S_CHECK_COND)) {
4948                 /*
4949                 **   Check condition code
4950                 */
4951                 cmd->result = DID_OK << 16 | S_CHECK_COND;
4952 
4953                 /*
4954                 **      Copy back sense data to caller's buffer.
4955                 */
4956                 memcpy(cmd->sense_buffer, cp->sense_buf,
4957                        min_t(size_t, SCSI_SENSE_BUFFERSIZE,
4958                              sizeof(cp->sense_buf)));
4959 
4960                 if (DEBUG_FLAGS & (DEBUG_RESULT|DEBUG_TINY)) {
4961                         u_char *p = cmd->sense_buffer;
4962                         int i;
4963                         PRINT_ADDR(cmd, "sense data:");
4964                         for (i=0; i<14; i++) printk (" %x", *p++);
4965                         printk (".\n");
4966                 }
4967         } else if ((cp->host_status == HS_COMPLETE)
4968                 && (cp->scsi_status == S_CONFLICT)) {
4969                 /*
4970                 **   Reservation Conflict condition code
4971                 */
4972                 cmd->result = DID_OK << 16 | S_CONFLICT;
4973         
4974         } else if ((cp->host_status == HS_COMPLETE)
4975                 && (cp->scsi_status == S_BUSY ||
4976                     cp->scsi_status == S_QUEUE_FULL)) {
4977 
4978                 /*
4979                 **   Target is busy.
4980                 */
4981                 cmd->result = ScsiResult(DID_OK, cp->scsi_status);
4982 
4983         } else if ((cp->host_status == HS_SEL_TIMEOUT)
4984                 || (cp->host_status == HS_TIMEOUT)) {
4985 
4986                 /*
4987                 **   No response
4988                 */
4989                 cmd->result = ScsiResult(DID_TIME_OUT, cp->scsi_status);
4990 
4991         } else if (cp->host_status == HS_RESET) {
4992 
4993                 /*
4994                 **   SCSI bus reset
4995                 */
4996                 cmd->result = ScsiResult(DID_RESET, cp->scsi_status);
4997 
4998         } else if (cp->host_status == HS_ABORTED) {
4999 
5000                 /*
5001                 **   Transfer aborted
5002                 */
5003                 cmd->result = ScsiResult(DID_ABORT, cp->scsi_status);
5004 
5005         } else {
5006 
5007                 /*
5008                 **  Other protocol messes
5009                 */
5010                 PRINT_ADDR(cmd, "COMMAND FAILED (%x %x) @%p.\n",
5011                         cp->host_status, cp->scsi_status, cp);
5012 
5013                 cmd->result = ScsiResult(DID_ERROR, cp->scsi_status);
5014         }
5015 
5016         /*
5017         **      trace output
5018         */
5019 
5020         if (tp->usrflag & UF_TRACE) {
5021                 u_char * p;
5022                 int i;
5023                 PRINT_ADDR(cmd, " CMD:");
5024                 p = (u_char*) &cmd->cmnd[0];
5025                 for (i=0; i<cmd->cmd_len; i++) printk (" %x", *p++);
5026 
5027                 if (cp->host_status==HS_COMPLETE) {
5028                         switch (cp->scsi_status) {
5029                         case S_GOOD:
5030                                 printk ("  GOOD");
5031                                 break;
5032                         case S_CHECK_COND:
5033                                 printk ("  SENSE:");
5034                                 p = (u_char*) &cmd->sense_buffer;
5035                                 for (i=0; i<14; i++)
5036                                         printk (" %x", *p++);
5037                                 break;
5038                         default:
5039                                 printk ("  STAT: %x\n", cp->scsi_status);
5040                                 break;
5041                         }
5042                 } else printk ("  HOSTERROR: %x", cp->host_status);
5043                 printk ("\n");
5044         }
5045 
5046         /*
5047         **      Free this ccb
5048         */
5049         ncr_free_ccb (np, cp);
5050 
5051         /*
5052         **      requeue awaiting scsi commands for this lun.
5053         */
5054         if (lp && lp->queuedccbs < lp->queuedepth &&
5055             !list_empty(&lp->wait_ccbq))
5056                 ncr_start_next_ccb(np, lp, 2);
5057 
5058         /*
5059         **      requeue awaiting scsi commands for this controller.
5060         */
5061         if (np->waiting_list)
5062                 requeue_waiting_list(np);
5063 
5064         /*
5065         **      signal completion to generic driver.
5066         */
5067         ncr_queue_done_cmd(np, cmd);
5068 }
5069 
5070 /*==========================================================
5071 **
5072 **
5073 **      Signal all (or one) control block done.
5074 **
5075 **
5076 **==========================================================
5077 */
5078 
5079 /*
5080 **      This CCB has been skipped by the NCR.
5081 **      Queue it in the corresponding unit queue.
5082 */
5083 static void ncr_ccb_skipped(struct ncb *np, struct ccb *cp)
5084 {
5085         struct tcb *tp = &np->target[cp->target];
5086         struct lcb *lp = tp->lp[cp->lun];
5087 
5088         if (lp && cp != np->ccb) {
5089                 cp->host_status &= ~HS_SKIPMASK;
5090                 cp->start.schedule.l_paddr = 
5091                         cpu_to_scr(NCB_SCRIPT_PHYS (np, select));
5092                 list_move_tail(&cp->link_ccbq, &lp->skip_ccbq);
5093                 if (cp->queued) {
5094                         --lp->queuedccbs;
5095                 }
5096         }
5097         if (cp->queued) {
5098                 --np->queuedccbs;
5099                 cp->queued = 0;
5100         }
5101 }
5102 
5103 /*
5104 **      The NCR has completed CCBs.
5105 **      Look at the DONE QUEUE if enabled, otherwise scan all CCBs
5106 */
5107 void ncr_wakeup_done (struct ncb *np)
5108 {
5109         struct ccb *cp;
5110 #ifdef SCSI_NCR_CCB_DONE_SUPPORT
5111         int i, j;
5112 
5113         i = np->ccb_done_ic;
5114         while (1) {
5115                 j = i+1;
5116                 if (j >= MAX_DONE)
5117                         j = 0;
5118 
5119                 cp = np->ccb_done[j];
5120                 if (!CCB_DONE_VALID(cp))
5121                         break;
5122 
5123                 np->ccb_done[j] = (struct ccb *)CCB_DONE_EMPTY;
5124                 np->scripth->done_queue[5*j + 4] =
5125                                 cpu_to_scr(NCB_SCRIPT_PHYS (np, done_plug));
5126                 MEMORY_BARRIER();
5127                 np->scripth->done_queue[5*i + 4] =
5128                                 cpu_to_scr(NCB_SCRIPT_PHYS (np, done_end));
5129 
5130                 if (cp->host_status & HS_DONEMASK)
5131                         ncr_complete (np, cp);
5132                 else if (cp->host_status & HS_SKIPMASK)
5133                         ncr_ccb_skipped (np, cp);
5134 
5135                 i = j;
5136         }
5137         np->ccb_done_ic = i;
5138 #else
5139         cp = np->ccb;
5140         while (cp) {
5141                 if (cp->host_status & HS_DONEMASK)
5142                         ncr_complete (np, cp);
5143                 else if (cp->host_status & HS_SKIPMASK)
5144                         ncr_ccb_skipped (np, cp);
5145                 cp = cp->link_ccb;
5146         }
5147 #endif
5148 }
5149 
5150 /*
5151 **      Complete all active CCBs.
5152 */
5153 void ncr_wakeup (struct ncb *np, u_long code)
5154 {
5155         struct ccb *cp = np->ccb;
5156 
5157         while (cp) {
5158                 if (cp->host_status != HS_IDLE) {
5159                         cp->host_status = code;
5160                         ncr_complete (np, cp);
5161                 }
5162                 cp = cp->link_ccb;
5163         }
5164 }
5165 
5166 /*
5167 ** Reset ncr chip.
5168 */
5169 
5170 /* Some initialisation must be done immediately following reset, for 53c720,
5171  * at least.  EA (dcntl bit 5) isn't set here as it is set once only in
5172  * the _detect function.
5173  */
5174 static void ncr_chip_reset(struct ncb *np, int delay)
5175 {
5176         OUTB (nc_istat,  SRST);
5177         udelay(delay);
5178         OUTB (nc_istat,  0   );
5179 
5180         if (np->features & FE_EHP)
5181                 OUTB (nc_ctest0, EHP);
5182         if (np->features & FE_MUX)
5183                 OUTB (nc_ctest4, MUX);
5184 }
5185 
5186 
5187 /*==========================================================
5188 **
5189 **
5190 **      Start NCR chip.
5191 **
5192 **
5193 **==========================================================
5194 */
5195 
5196 void ncr_init (struct ncb *np, int reset, char * msg, u_long code)
5197 {
5198         int     i;
5199 
5200         /*
5201         **      Reset chip if asked, otherwise just clear fifos.
5202         */
5203 
5204         if (reset) {
5205                 OUTB (nc_istat,  SRST);
5206                 udelay(100);
5207         }
5208         else {
5209                 OUTB (nc_stest3, TE|CSF);
5210                 OUTONB (nc_ctest3, CLF);
5211         }
5212  
5213         /*
5214         **      Message.
5215         */
5216 
5217         if (msg) printk (KERN_INFO "%s: restart (%s).\n", ncr_name (np), msg);
5218 
5219         /*
5220         **      Clear Start Queue
5221         */
5222         np->queuedepth = MAX_START - 1; /* 1 entry needed as end marker */
5223         for (i = 1; i < MAX_START + MAX_START; i += 2)
5224                 np->scripth0->tryloop[i] =
5225                                 cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
5226 
5227         /*
5228         **      Start at first entry.
5229         */
5230         np->squeueput = 0;
5231         np->script0->startpos[0] = cpu_to_scr(NCB_SCRIPTH_PHYS (np, tryloop));
5232 
5233 #ifdef SCSI_NCR_CCB_DONE_SUPPORT
5234         /*
5235         **      Clear Done Queue
5236         */
5237         for (i = 0; i < MAX_DONE; i++) {
5238                 np->ccb_done[i] = (struct ccb *)CCB_DONE_EMPTY;
5239                 np->scripth0->done_queue[5*i + 4] =
5240                         cpu_to_scr(NCB_SCRIPT_PHYS (np, done_end));
5241         }
5242 #endif
5243 
5244         /*
5245         **      Start at first entry.
5246         */
5247         np->script0->done_pos[0] = cpu_to_scr(NCB_SCRIPTH_PHYS (np,done_queue));
5248         np->ccb_done_ic = MAX_DONE-1;
5249         np->scripth0->done_queue[5*(MAX_DONE-1) + 4] =
5250                         cpu_to_scr(NCB_SCRIPT_PHYS (np, done_plug));
5251 
5252         /*
5253         **      Wakeup all pending jobs.
5254         */
5255         ncr_wakeup (np, code);
5256 
5257         /*
5258         **      Init chip.
5259         */
5260 
5261         /*
5262         ** Remove reset; big delay because the 895 needs time for the
5263         ** bus mode to settle
5264         */
5265         ncr_chip_reset(np, 2000);
5266 
5267         OUTB (nc_scntl0, np->rv_scntl0 | 0xc0);
5268                                         /*  full arb., ena parity, par->ATN  */
5269         OUTB (nc_scntl1, 0x00);         /*  odd parity, and remove CRST!! */
5270 
5271         ncr_selectclock(np, np->rv_scntl3);     /* Select SCSI clock */
5272 
5273         OUTB (nc_scid  , RRE|np->myaddr);       /* Adapter SCSI address */
5274         OUTW (nc_respid, 1ul<<np->myaddr);      /* Id to respond to */
5275         OUTB (nc_istat , SIGP   );              /*  Signal Process */
5276         OUTB (nc_dmode , np->rv_dmode);         /* Burst length, dma mode */
5277         OUTB (nc_ctest5, np->rv_ctest5);        /* Large fifo + large burst */
5278 
5279         OUTB (nc_dcntl , NOCOM|np->rv_dcntl);   /* Protect SFBR */
5280         OUTB (nc_ctest0, np->rv_ctest0);        /* 720: CDIS and EHP */
5281         OUTB (nc_ctest3, np->rv_ctest3);        /* Write and invalidate */
5282         OUTB (nc_ctest4, np->rv_ctest4);        /* Master parity checking */
5283 
5284         OUTB (nc_stest2, EXT|np->rv_stest2);    /* Extended Sreq/Sack filtering */
5285         OUTB (nc_stest3, TE);                   /* TolerANT enable */
5286         OUTB (nc_stime0, 0x0c   );              /* HTH disabled  STO 0.25 sec */
5287 
5288         /*
5289         **      Disable disconnects.
5290         */
5291 
5292         np->disc = 0;
5293 
5294         /*
5295         **    Enable GPIO0 pin for writing if LED support.
5296         */
5297 
5298         if (np->features & FE_LED0) {
5299                 OUTOFFB (nc_gpcntl, 0x01);
5300         }
5301 
5302         /*
5303         **      enable ints
5304         */
5305 
5306         OUTW (nc_sien , STO|HTH|MA|SGE|UDC|RST|PAR);
5307         OUTB (nc_dien , MDPE|BF|ABRT|SSI|SIR|IID);
5308 
5309         /*
5310         **      Fill in target structure.
5311         **      Reinitialize usrsync.
5312         **      Reinitialize usrwide.
5313         **      Prepare sync negotiation according to actual SCSI bus mode.
5314         */
5315 
5316         for (i=0;i<MAX_TARGET;i++) {
5317                 struct tcb *tp = &np->target[i];
5318 
5319                 tp->sval    = 0;
5320                 tp->wval    = np->rv_scntl3;
5321 
5322                 if (tp->usrsync != 255) {
5323                         if (tp->usrsync <= np->maxsync) {
5324                                 if (tp->usrsync < np->minsync) {
5325                                         tp->usrsync = np->minsync;
5326                                 }
5327                         }
5328                         else
5329                                 tp->usrsync = 255;
5330                 }
5331 
5332                 if (tp->usrwide > np->maxwide)
5333                         tp->usrwide = np->maxwide;
5334 
5335         }
5336 
5337         /*
5338         **    Start script processor.
5339         */
5340         if (np->paddr2) {
5341                 if (bootverbose)
5342                         printk ("%s: Downloading SCSI SCRIPTS.\n",
5343                                 ncr_name(np));
5344                 OUTL (nc_scratcha, vtobus(np->script0));
5345                 OUTL_DSP (NCB_SCRIPTH_PHYS (np, start_ram));
5346         }
5347         else
5348                 OUTL_DSP (NCB_SCRIPT_PHYS (np, start));
5349 }
5350 
5351 /*==========================================================
5352 **
5353 **      Prepare the negotiation values for wide and
5354 **      synchronous transfers.
5355 **
5356 **==========================================================
5357 */
5358 
5359 static void ncr_negotiate (struct ncb* np, struct tcb* tp)
5360 {
5361         /*
5362         **      minsync unit is 4ns !
5363         */
5364 
5365         u_long minsync = tp->usrsync;
5366 
5367         /*
5368         **      SCSI bus mode limit
5369         */
5370 
5371         if (np->scsi_mode && np->scsi_mode == SMODE_SE) {
5372                 if (minsync < 12) minsync = 12;
5373         }
5374 
5375         /*
5376         **      our limit ..
5377         */
5378 
5379         if (minsync < np->minsync)
5380                 minsync = np->minsync;
5381 
5382         /*
5383         **      divider limit
5384         */
5385 
5386         if (minsync > np->maxsync)
5387                 minsync = 255;
5388 
5389         if (tp->maxoffs > np->maxoffs)
5390                 tp->maxoffs = np->maxoffs;
5391 
5392         tp->minsync = minsync;
5393         tp->maxoffs = (minsync<255 ? tp->maxoffs : 0);
5394 
5395         /*
5396         **      period=0: has to negotiate sync transfer
5397         */
5398 
5399         tp->period=0;
5400 
5401         /*
5402         **      widedone=0: has to negotiate wide transfer
5403         */
5404         tp->widedone=0;
5405 }
5406 
5407 /*==========================================================
5408 **
5409 **      Get clock factor and sync divisor for a given 
5410 **      synchronous factor period.
5411 **      Returns the clock factor (in sxfer) and scntl3 
5412 **      synchronous divisor field.
5413 **
5414 **==========================================================
5415 */
5416 
5417 static void ncr_getsync(struct ncb *np, u_char sfac, u_char *fakp, u_char *scntl3p)
5418 {
5419         u_long  clk = np->clock_khz;    /* SCSI clock frequency in kHz  */
5420         int     div = np->clock_divn;   /* Number of divisors supported */
5421         u_long  fak;                    /* Sync factor in sxfer         */
5422         u_long  per;                    /* Period in tenths of ns       */
5423         u_long  kpc;                    /* (per * clk)                  */
5424 
5425         /*
5426         **      Compute the synchronous period in tenths of nano-seconds
5427         */
5428         if      (sfac <= 10)    per = 250;
5429         else if (sfac == 11)    per = 303;
5430         else if (sfac == 12)    per = 500;
5431         else                    per = 40 * sfac;
5432 
5433         /*
5434         **      Look for the greatest clock divisor that allows an 
5435         **      input speed faster than the period.
5436         */
5437         kpc = per * clk;
5438         while (--div > 0)
5439                 if (kpc >= (div_10M[div] << 2)) break;
5440 
5441         /*
5442         **      Calculate the lowest clock factor that allows an output 
5443         **      speed not faster than the period.
5444         */
5445         fak = (kpc - 1) / div_10M[div] + 1;
5446 
5447 #if 0   /* This optimization does not seem very useful */
5448 
5449         per = (fak * div_10M[div]) / clk;
5450 
5451         /*
5452         **      Why not to try the immediate lower divisor and to choose 
5453         **      the one that allows the fastest output speed ?
5454         **      We don't want input speed too much greater than output speed.
5455         */
5456         if (div >= 1 && fak < 8) {
5457                 u_long fak2, per2;
5458                 fak2 = (kpc - 1) / div_10M[div-1] + 1;
5459                 per2 = (fak2 * div_10M[div-1]) / clk;
5460                 if (per2 < per && fak2 <= 8) {
5461                         fak = fak2;
5462                         per = per2;
5463                         --div;
5464                 }
5465         }
5466 #endif
5467 
5468         if (fak < 4) fak = 4;   /* Should never happen, too bad ... */
5469 
5470         /*
5471         **      Compute and return sync parameters for the ncr
5472         */
5473         *fakp           = fak - 4;
5474         *scntl3p        = ((div+1) << 4) + (sfac < 25 ? 0x80 : 0);
5475 }
5476 
5477 
5478 /*==========================================================
5479 **
5480 **      Set actual values, sync status and patch all ccbs of 
5481 **      a target according to new sync/wide agreement.
5482 **
5483 **==========================================================
5484 */
5485 
5486 static void ncr_set_sync_wide_status (struct ncb *np, u_char target)
5487 {
5488         struct ccb *cp;
5489         struct tcb *tp = &np->target[target];
5490 
5491         /*
5492         **      set actual value and sync_status
5493         */
5494         OUTB (nc_sxfer, tp->sval);
5495         np->sync_st = tp->sval;
5496         OUTB (nc_scntl3, tp->wval);
5497         np->wide_st = tp->wval;
5498 
5499         /*
5500         **      patch ALL ccbs of this target.
5501         */
5502         for (cp = np->ccb; cp; cp = cp->link_ccb) {
5503                 if (!cp->cmd) continue;
5504                 if (scmd_id(cp->cmd) != target) continue;
5505 #if 0
5506                 cp->sync_status = tp->sval;
5507                 cp->wide_status = tp->wval;
5508 #endif
5509                 cp->phys.select.sel_scntl3 = tp->wval;
5510                 cp->phys.select.sel_sxfer  = tp->sval;
5511         }
5512 }
5513 
5514 /*==========================================================
5515 **
5516 **      Switch sync mode for current job and it's target
5517 **
5518 **==========================================================
5519 */
5520 
5521 static void ncr_setsync (struct ncb *np, struct ccb *cp, u_char scntl3, u_char sxfer)
5522 {
5523         struct scsi_cmnd *cmd = cp->cmd;
5524         struct tcb *tp;
5525         u_char target = INB (nc_sdid) & 0x0f;
5526         u_char idiv;
5527 
5528         BUG_ON(target != (scmd_id(cmd) & 0xf));
5529 
5530         tp = &np->target[target];
5531 
5532         if (!scntl3 || !(sxfer & 0x1f))
5533                 scntl3 = np->rv_scntl3;
5534         scntl3 = (scntl3 & 0xf0) | (tp->wval & EWS) | (np->rv_scntl3 & 0x07);
5535 
5536         /*
5537         **      Deduce the value of controller sync period from scntl3.
5538         **      period is in tenths of nano-seconds.
5539         */
5540 
5541         idiv = ((scntl3 >> 4) & 0x7);
5542         if ((sxfer & 0x1f) && idiv)
5543                 tp->period = (((sxfer>>5)+4)*div_10M[idiv-1])/np->clock_khz;
5544         else
5545                 tp->period = 0xffff;
5546 
5547         /* Stop there if sync parameters are unchanged */
5548         if (tp->sval == sxfer && tp->wval == scntl3)
5549                 return;
5550         tp->sval = sxfer;
5551         tp->wval = scntl3;
5552 
5553         if (sxfer & 0x01f) {
5554                 /* Disable extended Sreq/Sack filtering */
5555                 if (tp->period <= 2000)
5556                         OUTOFFB(nc_stest2, EXT);
5557         }
5558  
5559         spi_display_xfer_agreement(tp->starget);
5560 
5561         /*
5562         **      set actual value and sync_status
5563         **      patch ALL ccbs of this target.
5564         */
5565         ncr_set_sync_wide_status(np, target);
5566 }
5567 
5568 /*==========================================================
5569 **
5570 **      Switch wide mode for current job and it's target
5571 **      SCSI specs say: a SCSI device that accepts a WDTR 
5572 **      message shall reset the synchronous agreement to 
5573 **      asynchronous mode.
5574 **
5575 **==========================================================
5576 */
5577 
5578 static void ncr_setwide (struct ncb *np, struct ccb *cp, u_char wide, u_char ack)
5579 {
5580         struct scsi_cmnd *cmd = cp->cmd;
5581         u16 target = INB (nc_sdid) & 0x0f;
5582         struct tcb *tp;
5583         u_char  scntl3;
5584         u_char  sxfer;
5585 
5586         BUG_ON(target != (scmd_id(cmd) & 0xf));
5587 
5588         tp = &np->target[target];
5589         tp->widedone  =  wide+1;
5590         scntl3 = (tp->wval & (~EWS)) | (wide ? EWS : 0);
5591 
5592         sxfer = ack ? 0 : tp->sval;
5593 
5594         /*
5595         **       Stop there if sync/wide parameters are unchanged
5596         */
5597         if (tp->sval == sxfer && tp->wval == scntl3) return;
5598         tp->sval = sxfer;
5599         tp->wval = scntl3;
5600 
5601         /*
5602         **      Bells and whistles   ;-)
5603         */
5604         if (bootverbose >= 2) {
5605                 dev_info(&cmd->device->sdev_target->dev, "WIDE SCSI %sabled.\n",
5606                                 (scntl3 & EWS) ? "en" : "dis");
5607         }
5608 
5609         /*
5610         **      set actual value and sync_status
5611         **      patch ALL ccbs of this target.
5612         */
5613         ncr_set_sync_wide_status(np, target);
5614 }
5615 
5616 /*==========================================================
5617 **
5618 **      Switch tagged mode for a target.
5619 **
5620 **==========================================================
5621 */
5622 
5623 static void ncr_setup_tags (struct ncb *np, struct scsi_device *sdev)
5624 {
5625         unsigned char tn = sdev->id, ln = sdev->lun;
5626         struct tcb *tp = &np->target[tn];
5627         struct lcb *lp = tp->lp[ln];
5628         u_char   reqtags, maxdepth;
5629 
5630         /*
5631         **      Just in case ...
5632         */
5633         if ((!tp) || (!lp) || !sdev)
5634                 return;
5635 
5636         /*
5637         **      If SCSI device queue depth is not yet set, leave here.
5638         */
5639         if (!lp->scdev_depth)
5640                 return;
5641 
5642         /*
5643         **      Donnot allow more tags than the SCSI driver can queue 
5644         **      for this device.
5645         **      Donnot allow more tags than we can handle.
5646         */
5647         maxdepth = lp->scdev_depth;
5648         if (maxdepth > lp->maxnxs)      maxdepth    = lp->maxnxs;
5649         if (lp->maxtags > maxdepth)     lp->maxtags = maxdepth;
5650         if (lp->numtags > maxdepth)     lp->numtags = maxdepth;
5651 
5652         /*
5653         **      only devices conformant to ANSI Version >= 2
5654         **      only devices capable of tagged commands
5655         **      only if enabled by user ..
5656         */
5657         if (sdev->tagged_supported && lp->numtags > 1) {
5658                 reqtags = lp->numtags;
5659         } else {
5660                 reqtags = 1;
5661         }
5662 
5663         /*
5664         **      Update max number of tags
5665         */
5666         lp->numtags = reqtags;
5667         if (lp->numtags > lp->maxtags)
5668                 lp->maxtags = lp->numtags;
5669 
5670         /*
5671         **      If we want to switch tag mode, we must wait 
5672         **      for no CCB to be active.
5673         */
5674         if      (reqtags > 1 && lp->usetags) {   /* Stay in tagged mode    */
5675                 if (lp->queuedepth == reqtags)   /* Already announced      */
5676                         return;
5677                 lp->queuedepth  = reqtags;
5678         }
5679         else if (reqtags <= 1 && !lp->usetags) { /* Stay in untagged mode  */
5680                 lp->queuedepth  = reqtags;
5681                 return;
5682         }
5683         else {                                   /* Want to switch tag mode */
5684                 if (lp->busyccbs)                /* If not yet safe, return */
5685                         return;
5686                 lp->queuedepth  = reqtags;
5687                 lp->usetags     = reqtags > 1 ? 1 : 0;
5688         }
5689 
5690         /*
5691         **      Patch the lun mini-script, according to tag mode.
5692         */
5693         lp->jump_tag.l_paddr = lp->usetags?
5694                         cpu_to_scr(NCB_SCRIPT_PHYS(np, resel_tag)) :
5695                         cpu_to_scr(NCB_SCRIPT_PHYS(np, resel_notag));
5696 
5697         /*
5698         **      Announce change to user.
5699         */
5700         if (bootverbose) {
5701                 if (lp->usetags) {
5702                         dev_info(&sdev->sdev_gendev,
5703                                 "tagged command queue depth set to %d\n",
5704                                 reqtags);
5705                 } else {
5706                         dev_info(&sdev->sdev_gendev,
5707                                         "tagged command queueing disabled\n");
5708                 }
5709         }
5710 }
5711 
5712 /*==========================================================
5713 **
5714 **
5715 **      ncr timeout handler.
5716 **
5717 **
5718 **==========================================================
5719 **
5720 **      Misused to keep the driver running when
5721 **      interrupts are not configured correctly.
5722 **
5723 **----------------------------------------------------------
5724 */
5725 
5726 static void ncr_timeout (struct ncb *np)
5727 {
5728         u_long  thistime = jiffies;
5729 
5730         /*
5731         **      If release process in progress, let's go
5732         **      Set the release stage from 1 to 2 to synchronize
5733         **      with the release process.
5734         */
5735 
5736         if (np->release_stage) {
5737                 if (np->release_stage == 1) np->release_stage = 2;
5738                 return;
5739         }
5740 
5741         np->timer.expires = jiffies + SCSI_NCR_TIMER_INTERVAL;
5742         add_timer(&np->timer);
5743 
5744         /*
5745         **      If we are resetting the ncr, wait for settle_time before 
5746         **      clearing it. Then command processing will be resumed.
5747         */
5748         if (np->settle_time) {
5749                 if (np->settle_time <= thistime) {
5750                         if (bootverbose > 1)
5751                                 printk("%s: command processing resumed\n", ncr_name(np));
5752                         np->settle_time = 0;
5753                         np->disc        = 1;
5754                         requeue_waiting_list(np);
5755                 }
5756                 return;
5757         }
5758 
5759         /*
5760         **      Since the generic scsi driver only allows us 0.5 second 
5761         **      to perform abort of a command, we must look at ccbs about 
5762         **      every 0.25 second.
5763         */
5764         if (np->lasttime + 4*HZ < thistime) {
5765                 /*
5766                 **      block ncr interrupts
5767                 */
5768                 np->lasttime = thistime;
5769         }
5770 
5771 #ifdef SCSI_NCR_BROKEN_INTR
5772         if (INB(nc_istat) & (INTF|SIP|DIP)) {
5773 
5774                 /*
5775                 **      Process pending interrupts.
5776                 */
5777                 if (DEBUG_FLAGS & DEBUG_TINY) printk ("{");
5778                 ncr_exception (np);
5779                 if (DEBUG_FLAGS & DEBUG_TINY) printk ("}");
5780         }
5781 #endif /* SCSI_NCR_BROKEN_INTR */
5782 }
5783 
5784 /*==========================================================
5785 **
5786 **      log message for real hard errors
5787 **
5788 **      "ncr0 targ 0?: ERROR (ds:si) (so-si-sd) (sxfer/scntl3) @ name (dsp:dbc)."
5789 **      "             reg: r0 r1 r2 r3 r4 r5 r6 ..... rf."
5790 **
5791 **      exception register:
5792 **              ds:     dstat
5793 **              si:     sist
5794 **
5795 **      SCSI bus lines:
5796 **              so:     control lines as driver by NCR.
5797 **              si:     control lines as seen by NCR.
5798 **              sd:     scsi data lines as seen by NCR.
5799 **
5800 **      wide/fastmode:
5801 **              sxfer:  (see the manual)
5802 **              scntl3: (see the manual)
5803 **
5804 **      current script command:
5805 **              dsp:    script address (relative to start of script).
5806 **              dbc:    first word of script command.
5807 **
5808 **      First 16 register of the chip:
5809 **              r0..rf
5810 **
5811 **==========================================================
5812 */
5813 
5814 static void ncr_log_hard_error(struct ncb *np, u16 sist, u_char dstat)
5815 {
5816         u32     dsp;
5817         int     script_ofs;
5818         int     script_size;
5819         char    *script_name;
5820         u_char  *script_base;
5821         int     i;
5822 
5823         dsp     = INL (nc_dsp);
5824 
5825         if (dsp > np->p_script && dsp <= np->p_script + sizeof(struct script)) {
5826                 script_ofs      = dsp - np->p_script;
5827                 script_size     = sizeof(struct script);
5828                 script_base     = (u_char *) np->script0;
5829                 script_name     = "script";
5830         }
5831         else if (np->p_scripth < dsp && 
5832                  dsp <= np->p_scripth + sizeof(struct scripth)) {
5833                 script_ofs      = dsp - np->p_scripth;
5834                 script_size     = sizeof(struct scripth);
5835                 script_base     = (u_char *) np->scripth0;
5836                 script_name     = "scripth";
5837         } else {
5838                 script_ofs      = dsp;
5839                 script_size     = 0;
5840                 script_base     = NULL;
5841                 script_name     = "mem";
5842         }
5843 
5844         printk ("%s:%d: ERROR (%x:%x) (%x-%x-%x) (%x/%x) @ (%s %x:%08x).\n",
5845                 ncr_name (np), (unsigned)INB (nc_sdid)&0x0f, dstat, sist,
5846                 (unsigned)INB (nc_socl), (unsigned)INB (nc_sbcl), (unsigned)INB (nc_sbdl),
5847                 (unsigned)INB (nc_sxfer),(unsigned)INB (nc_scntl3), script_name, script_ofs,
5848                 (unsigned)INL (nc_dbc));
5849 
5850         if (((script_ofs & 3) == 0) &&
5851             (unsigned)script_ofs < script_size) {
5852                 printk ("%s: script cmd = %08x\n", ncr_name(np),
5853                         scr_to_cpu((int) *(ncrcmd *)(script_base + script_ofs)));
5854         }
5855 
5856         printk ("%s: regdump:", ncr_name(np));
5857         for (i=0; i<16;i++)
5858             printk (" %02x", (unsigned)INB_OFF(i));
5859         printk (".\n");
5860 }
5861 
5862 /*============================================================
5863 **
5864 **      ncr chip exception handler.
5865 **
5866 **============================================================
5867 **
5868 **      In normal cases, interrupt conditions occur one at a 
5869 **      time. The ncr is able to stack in some extra registers 
5870 **      other interrupts that will occur after the first one.
5871 **      But, several interrupts may occur at the same time.
5872 **
5873 **      We probably should only try to deal with the normal 
5874 **      case, but it seems that multiple interrupts occur in 
5875 **      some cases that are not abnormal at all.
5876 **
5877 **      The most frequent interrupt condition is Phase Mismatch.
5878 **      We should want to service this interrupt quickly.
5879 **      A SCSI parity error may be delivered at the same time.
5880 **      The SIR interrupt is not very frequent in this driver, 
5881 **      since the INTFLY is likely used for command completion 
5882 **      signaling.
5883 **      The Selection Timeout interrupt may be triggered with 
5884 **      IID and/or UDC.
5885 **      The SBMC interrupt (SCSI Bus Mode Change) may probably 
5886 **      occur at any time.
5887 **
5888 **      This handler try to deal as cleverly as possible with all
5889 **      the above.
5890 **
5891 **============================================================
5892 */
5893 
5894 void ncr_exception (struct ncb *np)
5895 {
5896         u_char  istat, dstat;
5897         u16     sist;
5898         int     i;
5899 
5900         /*
5901         **      interrupt on the fly ?
5902         **      Since the global header may be copied back to a CCB 
5903         **      using a posted PCI memory write, the last operation on 
5904         **      the istat register is a READ in order to flush posted 
5905         **      PCI write commands.
5906         */
5907         istat = INB (nc_istat);
5908         if (istat & INTF) {
5909                 OUTB (nc_istat, (istat & SIGP) | INTF);
5910                 istat = INB (nc_istat);
5911                 if (DEBUG_FLAGS & DEBUG_TINY) printk ("F ");
5912                 ncr_wakeup_done (np);
5913         }
5914 
5915         if (!(istat & (SIP|DIP)))
5916                 return;
5917 
5918         if (istat & CABRT)
5919                 OUTB (nc_istat, CABRT);
5920 
5921         /*
5922         **      Steinbach's Guideline for Systems Programming:
5923         **      Never test for an error condition you don't know how to handle.
5924         */
5925 
5926         sist  = (istat & SIP) ? INW (nc_sist)  : 0;
5927         dstat = (istat & DIP) ? INB (nc_dstat) : 0;
5928 
5929         if (DEBUG_FLAGS & DEBUG_TINY)
5930                 printk ("<%d|%x:%x|%x:%x>",
5931                         (int)INB(nc_scr0),
5932                         dstat,sist,
5933                         (unsigned)INL(nc_dsp),
5934                         (unsigned)INL(nc_dbc));
5935 
5936         /*========================================================
5937         **      First, interrupts we want to service cleanly.
5938         **
5939         **      Phase mismatch is the most frequent interrupt, and 
5940         **      so we have to service it as quickly and as cleanly 
5941         **      as possible.
5942         **      Programmed interrupts are rarely used in this driver,
5943         **      but we must handle them cleanly anyway.
5944         **      We try to deal with PAR and SBMC combined with 
5945         **      some other interrupt(s).
5946         **=========================================================
5947         */
5948 
5949         if (!(sist  & (STO|GEN|HTH|SGE|UDC|RST)) &&
5950             !(dstat & (MDPE|BF|ABRT|IID))) {
5951                 if ((sist & SBMC) && ncr_int_sbmc (np))
5952                         return;
5953                 if ((sist & PAR)  && ncr_int_par  (np))
5954                         return;
5955                 if (sist & MA) {
5956                         ncr_int_ma (np);
5957                         return;
5958                 }
5959                 if (dstat & SIR) {
5960                         ncr_int_sir (np);
5961                         return;
5962                 }
5963                 /*
5964                 **  DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 2.
5965                 */
5966                 if (!(sist & (SBMC|PAR)) && !(dstat & SSI)) {
5967                         printk( "%s: unknown interrupt(s) ignored, "
5968                                 "ISTAT=%x DSTAT=%x SIST=%x\n",
5969                                 ncr_name(np), istat, dstat, sist);
5970                         return;
5971                 }
5972                 OUTONB_STD ();
5973                 return;
5974         }
5975 
5976         /*========================================================
5977         **      Now, interrupts that need some fixing up.
5978         **      Order and multiple interrupts is so less important.
5979         **
5980         **      If SRST has been asserted, we just reset the chip.
5981         **
5982         **      Selection is intirely handled by the chip. If the 
5983         **      chip says STO, we trust it. Seems some other 
5984         **      interrupts may occur at the same time (UDC, IID), so 
5985         **      we ignore them. In any case we do enough fix-up 
5986         **      in the service routine.
5987         **      We just exclude some fatal dma errors.
5988         **=========================================================
5989         */
5990 
5991         if (sist & RST) {
5992                 ncr_init (np, 1, bootverbose ? "scsi reset" : NULL, HS_RESET);
5993                 return;
5994         }
5995 
5996         if ((sist & STO) &&
5997                 !(dstat & (MDPE|BF|ABRT))) {
5998         /*
5999         **      DEL 397 - 53C875 Rev 3 - Part Number 609-0392410 - ITEM 1.
6000         */
6001                 OUTONB (nc_ctest3, CLF);
6002 
6003                 ncr_int_sto (np);
6004                 return;
6005         }
6006 
6007         /*=========================================================
6008         **      Now, interrupts we are not able to recover cleanly.
6009         **      (At least for the moment).
6010         **
6011         **      Do the register dump.
6012         **      Log message for real hard errors.
6013         **      Clear all fifos.
6014         **      For MDPE, BF, ABORT, IID, SGE and HTH we reset the 
6015         **      BUS and the chip.
6016         **      We are more soft for UDC.
6017         **=========================================================
6018         */
6019 
6020         if (time_after(jiffies, np->regtime)) {
6021                 np->regtime = jiffies + 10*HZ;
6022                 for (i = 0; i<sizeof(np->regdump); i++)
6023                         ((char*)&np->regdump)[i] = INB_OFF(i);
6024                 np->regdump.nc_dstat = dstat;
6025                 np->regdump.nc_sist  = sist;
6026         }
6027 
6028         ncr_log_hard_error(np, sist, dstat);
6029 
6030         printk ("%s: have to clear fifos.\n", ncr_name (np));
6031         OUTB (nc_stest3, TE|CSF);
6032         OUTONB (nc_ctest3, CLF);
6033 
6034         if ((sist & (SGE)) ||
6035                 (dstat & (MDPE|BF|ABRT|IID))) {
6036                 ncr_start_reset(np);
6037                 return;
6038         }
6039 
6040         if (sist & HTH) {
6041                 printk ("%s: handshake timeout\n", ncr_name(np));
6042                 ncr_start_reset(np);
6043                 return;
6044         }
6045 
6046         if (sist & UDC) {
6047                 printk ("%s: unexpected disconnect\n", ncr_name(np));
6048                 OUTB (HS_PRT, HS_UNEXPECTED);
6049                 OUTL_DSP (NCB_SCRIPT_PHYS (np, cleanup));
6050                 return;
6051         }
6052 
6053         /*=========================================================
6054         **      We just miss the cause of the interrupt. :(
6055         **      Print a message. The timeout will do the real work.
6056         **=========================================================
6057         */
6058         printk ("%s: unknown interrupt\n", ncr_name(np));
6059 }
6060 
6061 /*==========================================================
6062 **
6063 **      ncr chip exception handler for selection timeout
6064 **
6065 **==========================================================
6066 **
6067 **      There seems to be a bug in the 53c810.
6068 **      Although a STO-Interrupt is pending,
6069 **      it continues executing script commands.
6070 **      But it will fail and interrupt (IID) on
6071 **      the next instruction where it's looking
6072 **      for a valid phase.
6073 **
6074 **----------------------------------------------------------
6075 */
6076 
6077 void ncr_int_sto (struct ncb *np)
6078 {
6079         u_long dsa;
6080         struct ccb *cp;
6081         if (DEBUG_FLAGS & DEBUG_TINY) printk ("T");
6082 
6083         /*
6084         **      look for ccb and set the status.
6085         */
6086 
6087         dsa = INL (nc_dsa);
6088         cp = np->ccb;
6089         while (cp && (CCB_PHYS (cp, phys) != dsa))
6090                 cp = cp->link_ccb;
6091 
6092         if (cp) {
6093                 cp-> host_status = HS_SEL_TIMEOUT;
6094                 ncr_complete (np, cp);
6095         }
6096 
6097         /*
6098         **      repair start queue and jump to start point.
6099         */
6100 
6101         OUTL_DSP (NCB_SCRIPTH_PHYS (np, sto_restart));
6102         return;
6103 }
6104 
6105 /*==========================================================
6106 **
6107 **      ncr chip exception handler for SCSI bus mode change
6108 **
6109 **==========================================================
6110 **
6111 **      spi2-r12 11.2.3 says a transceiver mode change must 
6112 **      generate a reset event and a device that detects a reset 
6113 **      event shall initiate a hard reset. It says also that a
6114 **      device that detects a mode change shall set data transfer 
6115 **      mode to eight bit asynchronous, etc...
6116 **      So, just resetting should be enough.
6117 **       
6118 **
6119 **----------------------------------------------------------
6120 */
6121 
6122 static int ncr_int_sbmc (struct ncb *np)
6123 {
6124         u_char scsi_mode = INB (nc_stest4) & SMODE;
6125 
6126         if (scsi_mode != np->scsi_mode) {
6127                 printk("%s: SCSI bus mode change from %x to %x.\n",
6128                         ncr_name(np), np->scsi_mode, scsi_mode);
6129 
6130                 np->scsi_mode = scsi_mode;
6131 
6132 
6133                 /*
6134                 **      Suspend command processing for 1 second and 
6135                 **      reinitialize all except the chip.
6136                 */
6137                 np->settle_time = jiffies + HZ;
6138                 ncr_init (np, 0, bootverbose ? "scsi mode change" : NULL, HS_RESET);
6139                 return 1;
6140         }
6141         return 0;
6142 }
6143 
6144 /*==========================================================
6145 **
6146 **      ncr chip exception handler for SCSI parity error.
6147 **
6148 **==========================================================
6149 **
6150 **
6151 **----------------------------------------------------------
6152 */
6153 
6154 static int ncr_int_par (struct ncb *np)
6155 {
6156         u_char  hsts    = INB (HS_PRT);
6157         u32     dbc     = INL (nc_dbc);
6158         u_char  sstat1  = INB (nc_sstat1);
6159         int phase       = -1;
6160         int msg         = -1;
6161         u32 jmp;
6162 
6163         printk("%s: SCSI parity error detected: SCR1=%d DBC=%x SSTAT1=%x\n",
6164                 ncr_name(np), hsts, dbc, sstat1);
6165 
6166         /*
6167          *      Ignore the interrupt if the NCR is not connected 
6168          *      to the SCSI bus, since the right work should have  
6169          *      been done on unexpected disconnection handling.
6170          */
6171         if (!(INB (nc_scntl1) & ISCON))
6172                 return 0;
6173 
6174         /*
6175          *      If the nexus is not clearly identified, reset the bus.
6176          *      We will try to do better later.
6177          */
6178         if (hsts & HS_INVALMASK)
6179                 goto reset_all;
6180 
6181         /*
6182          *      If the SCSI parity error occurs in MSG IN phase, prepare a 
6183          *      MSG PARITY message. Otherwise, prepare a INITIATOR DETECTED 
6184          *      ERROR message and let the device decide to retry the command 
6185          *      or to terminate with check condition. If we were in MSG IN 
6186          *      phase waiting for the response of a negotiation, we will 
6187          *      get SIR_NEGO_FAILED at dispatch.
6188          */
6189         if (!(dbc & 0xc0000000))
6190                 phase = (dbc >> 24) & 7;
6191         if (phase == 7)
6192                 msg = MSG_PARITY_ERROR;
6193         else
6194                 msg = INITIATOR_ERROR;
6195 
6196 
6197         /*
6198          *      If the NCR stopped on a MOVE ^ DATA_IN, we jump to a 
6199          *      script that will ignore all data in bytes until phase 
6200          *      change, since we are not sure the chip will wait the phase 
6201          *      change prior to delivering the interrupt.
6202          */
6203         if (phase == 1)
6204                 jmp = NCB_SCRIPTH_PHYS (np, par_err_data_in);
6205         else
6206                 jmp = NCB_SCRIPTH_PHYS (np, par_err_other);
6207 
6208         OUTONB (nc_ctest3, CLF );       /* clear dma fifo  */
6209         OUTB (nc_stest3, TE|CSF);       /* clear scsi fifo */
6210 
6211         np->msgout[0] = msg;
6212         OUTL_DSP (jmp);
6213         return 1;
6214 
6215 reset_all:
6216         ncr_start_reset(np);
6217         return 1;
6218 }
6219 
6220 /*==========================================================
6221 **
6222 **
6223 **      ncr chip exception handler for phase errors.
6224 **
6225 **
6226 **==========================================================
6227 **
6228 **      We have to construct a new transfer descriptor,
6229 **      to transfer the rest of the current block.
6230 **
6231 **----------------------------------------------------------
6232 */
6233 
6234 static void ncr_int_ma (struct ncb *np)
6235 {
6236         u32     dbc;
6237         u32     rest;
6238         u32     dsp;
6239         u32     dsa;
6240         u32     nxtdsp;
6241         u32     newtmp;
6242         u32     *vdsp;
6243         u32     oadr, olen;
6244         u32     *tblp;
6245         ncrcmd *newcmd;
6246         u_char  cmd, sbcl;
6247         struct ccb *cp;
6248 
6249         dsp     = INL (nc_dsp);
6250         dbc     = INL (nc_dbc);
6251         sbcl    = INB (nc_sbcl);
6252 
6253         cmd     = dbc >> 24;
6254         rest    = dbc & 0xffffff;
6255 
6256         /*
6257         **      Take into account dma fifo and various buffers and latches,
6258         **      only if the interrupted phase is an OUTPUT phase.
6259         */
6260 
6261         if ((cmd & 1) == 0) {
6262                 u_char  ctest5, ss0, ss2;
6263                 u16     delta;
6264 
6265                 ctest5 = (np->rv_ctest5 & DFS) ? INB (nc_ctest5) : 0;
6266                 if (ctest5 & DFS)
6267                         delta=(((ctest5 << 8) | (INB (nc_dfifo) & 0xff)) - rest) & 0x3ff;
6268                 else
6269                         delta=(INB (nc_dfifo) - rest) & 0x7f;
6270 
6271                 /*
6272                 **      The data in the dma fifo has not been transferred to
6273                 **      the target -> add the amount to the rest
6274                 **      and clear the data.
6275                 **      Check the sstat2 register in case of wide transfer.
6276                 */
6277 
6278                 rest += delta;
6279                 ss0  = INB (nc_sstat0);
6280                 if (ss0 & OLF) rest++;
6281                 if (ss0 & ORF) rest++;
6282                 if (INB(nc_scntl3) & EWS) {
6283                         ss2 = INB (nc_sstat2);
6284                         if (ss2 & OLF1) rest++;
6285                         if (ss2 & ORF1) rest++;
6286                 }
6287 
6288                 if (DEBUG_FLAGS & (DEBUG_TINY|DEBUG_PHASE))
6289                         printk ("P%x%x RL=%d D=%d SS0=%x ", cmd&7, sbcl&7,
6290                                 (unsigned) rest, (unsigned) delta, ss0);
6291 
6292         } else  {
6293                 if (DEBUG_FLAGS & (DEBUG_TINY|DEBUG_PHASE))
6294                         printk ("P%x%x RL=%d ", cmd&7, sbcl&7, rest);
6295         }
6296 
6297         /*
6298         **      Clear fifos.
6299         */
6300         OUTONB (nc_ctest3, CLF );       /* clear dma fifo  */
6301         OUTB (nc_stest3, TE|CSF);       /* clear scsi fifo */
6302 
6303         /*
6304         **      locate matching cp.
6305         **      if the interrupted phase is DATA IN or DATA OUT,
6306         **      trust the global header.
6307         */
6308         dsa = INL (nc_dsa);
6309         if (!(cmd & 6)) {
6310                 cp = np->header.cp;
6311                 if (CCB_PHYS(cp, phys) != dsa)
6312                         cp = NULL;
6313         } else {
6314                 cp  = np->ccb;
6315                 while (cp && (CCB_PHYS (cp, phys) != dsa))
6316                         cp = cp->link_ccb;
6317         }
6318 
6319         /*
6320         **      try to find the interrupted script command,
6321         **      and the address at which to continue.
6322         */
6323         vdsp    = NULL;
6324         nxtdsp  = 0;
6325         if      (dsp >  np->p_script &&
6326                  dsp <= np->p_script + sizeof(struct script)) {
6327                 vdsp = (u32 *)((char*)np->script0 + (dsp-np->p_script-8));
6328                 nxtdsp = dsp;
6329         }
6330         else if (dsp >  np->p_scripth &&
6331                  dsp <= np->p_scripth + sizeof(struct scripth)) {
6332                 vdsp = (u32 *)((char*)np->scripth0 + (dsp-np->p_scripth-8));
6333                 nxtdsp = dsp;
6334         }
6335         else if (cp) {
6336                 if      (dsp == CCB_PHYS (cp, patch[2])) {
6337                         vdsp = &cp->patch[0];
6338                         nxtdsp = scr_to_cpu(vdsp[3]);
6339                 }
6340                 else if (dsp == CCB_PHYS (cp, patch[6])) {
6341                         vdsp = &cp->patch[4];
6342                         nxtdsp = scr_to_cpu(vdsp[3]);
6343                 }
6344         }
6345 
6346         /*
6347         **      log the information
6348         */
6349 
6350         if (DEBUG_FLAGS & DEBUG_PHASE) {
6351                 printk ("\nCP=%p CP2=%p DSP=%x NXT=%x VDSP=%p CMD=%x ",
6352                         cp, np->header.cp,
6353                         (unsigned)dsp,
6354                         (unsigned)nxtdsp, vdsp, cmd);
6355         }
6356 
6357         /*
6358         **      cp=0 means that the DSA does not point to a valid control 
6359         **      block. This should not happen since we donnot use multi-byte 
6360         **      move while we are being reselected ot after command complete.
6361         **      We are not able to recover from such a phase error.
6362         */
6363         if (!cp) {
6364                 printk ("%s: SCSI phase error fixup: "
6365                         "CCB already dequeued (0x%08lx)\n", 
6366                         ncr_name (np), (u_long) np->header.cp);
6367                 goto reset_all;
6368         }
6369 
6370         /*
6371         **      get old startaddress and old length.
6372         */
6373 
6374         oadr = scr_to_cpu(vdsp[1]);
6375 
6376         if (cmd & 0x10) {       /* Table indirect */
6377                 tblp = (u32 *) ((char*) &cp->phys + oadr);
6378                 olen = scr_to_cpu(tblp[0]);
6379                 oadr = scr_to_cpu(tblp[1]);
6380         } else {
6381                 tblp = (u32 *) 0;
6382                 olen = scr_to_cpu(vdsp[0]) & 0xffffff;
6383         }
6384 
6385         if (DEBUG_FLAGS & DEBUG_PHASE) {
6386                 printk ("OCMD=%x\nTBLP=%p OLEN=%x OADR=%x\n",
6387                         (unsigned) (scr_to_cpu(vdsp[0]) >> 24),
6388                         tblp,
6389                         (unsigned) olen,
6390                         (unsigned) oadr);
6391         }
6392 
6393         /*
6394         **      check cmd against assumed interrupted script command.
6395         */
6396 
6397         if (cmd != (scr_to_cpu(vdsp[0]) >> 24)) {
6398                 PRINT_ADDR(cp->cmd, "internal error: cmd=%02x != %02x=(vdsp[0] "
6399                                 ">> 24)\n", cmd, scr_to_cpu(vdsp[0]) >> 24);
6400 
6401                 goto reset_all;
6402         }
6403 
6404         /*
6405         **      cp != np->header.cp means that the header of the CCB 
6406         **      currently being processed has not yet been copied to 
6407         **      the global header area. That may happen if the device did 
6408         **      not accept all our messages after having been selected.
6409         */
6410         if (cp != np->header.cp) {
6411                 printk ("%s: SCSI phase error fixup: "
6412                         "CCB address mismatch (0x%08lx != 0x%08lx)\n", 
6413                         ncr_name (np), (u_long) cp, (u_long) np->header.cp);
6414         }
6415 
6416         /*
6417         **      if old phase not dataphase, leave here.
6418         */
6419 
6420         if (cmd & 0x06) {
6421                 PRINT_ADDR(cp->cmd, "phase change %x-%x %d@%08x resid=%d.\n",
6422                         cmd&7, sbcl&7, (unsigned)olen,
6423                         (unsigned)oadr, (unsigned)rest);
6424                 goto unexpected_phase;
6425         }
6426 
6427         /*
6428         **      choose the correct patch area.
6429         **      if savep points to one, choose the other.
6430         */
6431 
6432         newcmd = cp->patch;
6433         newtmp = CCB_PHYS (cp, patch);
6434         if (newtmp == scr_to_cpu(cp->phys.header.savep)) {
6435                 newcmd = &cp->patch[4];
6436                 newtmp = CCB_PHYS (cp, patch[4]);
6437         }
6438 
6439         /*
6440         **      fillin the commands
6441         */
6442 
6443         newcmd[0] = cpu_to_scr(((cmd & 0x0f) << 24) | rest);
6444         newcmd[1] = cpu_to_scr(oadr + olen - rest);
6445         newcmd[2] = cpu_to_scr(SCR_JUMP);
6446         newcmd[3] = cpu_to_scr(nxtdsp);
6447 
6448         if (DEBUG_FLAGS & DEBUG_PHASE) {
6449                 PRINT_ADDR(cp->cmd, "newcmd[%d] %x %x %x %x.\n",
6450                         (int) (newcmd - cp->patch),
6451                         (unsigned)scr_to_cpu(newcmd[0]),
6452                         (unsigned)scr_to_cpu(newcmd[1]),
6453                         (unsigned)scr_to_cpu(newcmd[2]),
6454                         (unsigned)scr_to_cpu(newcmd[3]));
6455         }
6456         /*
6457         **      fake the return address (to the patch).
6458         **      and restart script processor at dispatcher.
6459         */
6460         OUTL (nc_temp, newtmp);
6461         OUTL_DSP (NCB_SCRIPT_PHYS (np, dispatch));
6462         return;
6463 
6464         /*
6465         **      Unexpected phase changes that occurs when the current phase 
6466         **      is not a DATA IN or DATA OUT phase are due to error conditions.
6467         **      Such event may only happen when the SCRIPTS is using a 
6468         **      multibyte SCSI MOVE.
6469         **
6470         **      Phase change            Some possible cause
6471         **
6472         **      COMMAND  --> MSG IN     SCSI parity error detected by target.
6473         **      COMMAND  --> STATUS     Bad command or refused by target.
6474         **      MSG OUT  --> MSG IN     Message rejected by target.
6475         **      MSG OUT  --> COMMAND    Bogus target that discards extended
6476         **                              negotiation messages.
6477         **
6478         **      The code below does not care of the new phase and so 
6479         **      trusts the target. Why to annoy it ?
6480         **      If the interrupted phase is COMMAND phase, we restart at
6481         **      dispatcher.
6482         **      If a target does not get all the messages after selection, 
6483         **      the code assumes blindly that the target discards extended 
6484         **      messages and clears the negotiation status.
6485         **      If the target does not want all our response to negotiation,
6486         **      we force a SIR_NEGO_PROTO interrupt (it is a hack that avoids 
6487         **      bloat for such a should_not_happen situation).
6488         **      In all other situation, we reset the BUS.
6489         **      Are these assumptions reasonable ? (Wait and see ...)
6490         */
6491 unexpected_phase:
6492         dsp -= 8;
6493         nxtdsp = 0;
6494 
6495         switch (cmd & 7) {
6496         case 2: /* COMMAND phase */
6497                 nxtdsp = NCB_SCRIPT_PHYS (np, dispatch);
6498                 break;
6499 #if 0
6500         case 3: /* STATUS  phase */
6501                 nxtdsp = NCB_SCRIPT_PHYS (np, dispatch);
6502                 break;
6503 #endif
6504         case 6: /* MSG OUT phase */
6505                 np->scripth->nxtdsp_go_on[0] = cpu_to_scr(dsp + 8);
6506                 if      (dsp == NCB_SCRIPT_PHYS (np, send_ident)) {
6507                         cp->host_status = HS_BUSY;
6508                         nxtdsp = NCB_SCRIPTH_PHYS (np, clratn_go_on);
6509                 }
6510                 else if (dsp == NCB_SCRIPTH_PHYS (np, send_wdtr) ||
6511                          dsp == NCB_SCRIPTH_PHYS (np, send_sdtr)) {
6512                         nxtdsp = NCB_SCRIPTH_PHYS (np, nego_bad_phase);
6513                 }
6514                 break;
6515 #if 0
6516         case 7: /* MSG IN  phase */
6517                 nxtdsp = NCB_SCRIPT_PHYS (np, clrack);
6518                 break;
6519 #endif
6520         }
6521 
6522         if (nxtdsp) {
6523                 OUTL_DSP (nxtdsp);
6524                 return;
6525         }
6526 
6527 reset_all:
6528         ncr_start_reset(np);
6529 }
6530 
6531 
6532 static void ncr_sir_to_redo(struct ncb *np, int num, struct ccb *cp)
6533 {
6534         struct scsi_cmnd *cmd   = cp->cmd;
6535         struct tcb *tp  = &np->target[cmd->device->id];
6536         struct lcb *lp  = tp->lp[cmd->device->lun];
6537         struct list_head *qp;
6538         struct ccb *    cp2;
6539         int             disc_cnt = 0;
6540         int             busy_cnt = 0;
6541         u32             startp;
6542         u_char          s_status = INB (SS_PRT);
6543 
6544         /*
6545         **      Let the SCRIPTS processor skip all not yet started CCBs,
6546         **      and count disconnected CCBs. Since the busy queue is in 
6547         **      the same order as the chip start queue, disconnected CCBs 
6548         **      are before cp and busy ones after.
6549         */
6550         if (lp) {
6551                 qp = lp->busy_ccbq.prev;
6552                 while (qp != &lp->busy_ccbq) {
6553                         cp2 = list_entry(qp, struct ccb, link_ccbq);
6554                         qp  = qp->prev;
6555                         ++busy_cnt;
6556                         if (cp2 == cp)
6557                                 break;
6558                         cp2->start.schedule.l_paddr =
6559                         cpu_to_scr(NCB_SCRIPTH_PHYS (np, skip));
6560                 }
6561                 lp->held_ccb = cp;      /* Requeue when this one completes */
6562                 disc_cnt = lp->queuedccbs - busy_cnt;
6563         }
6564 
6565         switch(s_status) {
6566         default:        /* Just for safety, should never happen */
6567         case S_QUEUE_FULL:
6568                 /*
6569                 **      Decrease number of tags to the number of 
6570                 **      disconnected commands.
6571                 */
6572                 if (!lp)
6573                         goto out;
6574                 if (bootverbose >= 1) {
6575                         PRINT_ADDR(cmd, "QUEUE FULL! %d busy, %d disconnected "
6576                                         "CCBs\n", busy_cnt, disc_cnt);
6577                 }
6578                 if (disc_cnt < lp->numtags) {
6579                         lp->numtags     = disc_cnt > 2 ? disc_cnt : 2;
6580                         lp->num_good    = 0;
6581                         ncr_setup_tags (np, cmd->device);
6582                 }
6583                 /*
6584                 **      Requeue the command to the start queue.
6585                 **      If any disconnected commands,
6586                 **              Clear SIGP.
6587                 **              Jump to reselect.
6588                 */
6589                 cp->phys.header.savep = cp->startp;
6590                 cp->host_status = HS_BUSY;
6591                 cp->scsi_status = S_ILLEGAL;
6592 
6593                 ncr_put_start_queue(np, cp);
6594                 if (disc_cnt)
6595                         INB (nc_ctest2);                /* Clear SIGP */
6596                 OUTL_DSP (NCB_SCRIPT_PHYS (np, reselect));
6597                 return;
6598         case S_TERMINATED:
6599         case S_CHECK_COND:
6600                 /*
6601                 **      If we were requesting sense, give up.
6602                 */
6603                 if (cp->auto_sense)
6604                         goto out;
6605 
6606                 /*
6607                 **      Device returned CHECK CONDITION status.
6608                 **      Prepare all needed data strutures for getting 
6609                 **      sense data.
6610                 **
6611                 **      identify message
6612                 */
6613                 cp->scsi_smsg2[0]       = IDENTIFY(0, cmd->device->lun);
6614                 cp->phys.smsg.addr      = cpu_to_scr(CCB_PHYS (cp, scsi_smsg2));
6615                 cp->phys.smsg.size      = cpu_to_scr(1);
6616 
6617                 /*
6618                 **      sense command
6619                 */
6620                 cp->phys.cmd.addr       = cpu_to_scr(CCB_PHYS (cp, sensecmd));
6621                 cp->phys.cmd.size       = cpu_to_scr(6);
6622 
6623                 /*
6624                 **      patch requested size into sense command
6625                 */
6626                 cp->sensecmd[0]         = 0x03;
6627                 cp->sensecmd[1]         = (cmd->device->lun & 0x7) << 5;
6628                 cp->sensecmd[4]         = sizeof(cp->sense_buf);
6629 
6630                 /*
6631                 **      sense data
6632                 */
6633                 memset(cp->sense_buf, 0, sizeof(cp->sense_buf));
6634                 cp->phys.sense.addr     = cpu_to_scr(CCB_PHYS(cp,sense_buf[0]));
6635                 cp->phys.sense.size     = cpu_to_scr(sizeof(cp->sense_buf));
6636 
6637                 /*
6638                 **      requeue the command.
6639                 */
6640                 startp = cpu_to_scr(NCB_SCRIPTH_PHYS (np, sdata_in));
6641 
6642                 cp->phys.header.savep   = startp;
6643                 cp->phys.header.goalp   = startp + 24;
6644                 cp->phys.header.lastp   = startp;
6645                 cp->phys.header.wgoalp  = startp + 24;
6646                 cp->phys.header.wlastp  = startp;
6647 
6648                 cp->host_status = HS_BUSY;
6649                 cp->scsi_status = S_ILLEGAL;
6650                 cp->auto_sense  = s_status;
6651 
6652                 cp->start.schedule.l_paddr =
6653                         cpu_to_scr(NCB_SCRIPT_PHYS (np, select));
6654 
6655                 /*
6656                 **      Select without ATN for quirky devices.
6657                 */
6658                 if (cmd->device->select_no_atn)
6659                         cp->start.schedule.l_paddr =
6660                         cpu_to_scr(NCB_SCRIPTH_PHYS (np, select_no_atn));
6661 
6662                 ncr_put_start_queue(np, cp);
6663 
6664                 OUTL_DSP (NCB_SCRIPT_PHYS (np, start));
6665                 return;
6666         }
6667 
6668 out:
6669         OUTONB_STD ();
6670         return;
6671 }
6672 
6673 
6674 /*==========================================================
6675 **
6676 **
6677 **      ncr chip exception handler for programmed interrupts.
6678 **
6679 **
6680 **==========================================================
6681 */
6682 
6683 void ncr_int_sir (struct ncb *np)
6684 {
6685         u_char scntl3;
6686         u_char chg, ofs, per, fak, wide;
6687         u_char num = INB (nc_dsps);
6688         struct ccb *cp=NULL;
6689         u_long  dsa    = INL (nc_dsa);
6690         u_char  target = INB (nc_sdid) & 0x0f;
6691         struct tcb *tp     = &np->target[target];
6692         struct scsi_target *starget = tp->starget;
6693 
6694         if (DEBUG_FLAGS & DEBUG_TINY) printk ("I#%d", num);
6695 
6696         switch (num) {
6697         case SIR_INTFLY:
6698                 /*
6699                 **      This is used for HP Zalon/53c720 where INTFLY
6700                 **      operation is currently broken.
6701                 */
6702                 ncr_wakeup_done(np);
6703 #ifdef SCSI_NCR_CCB_DONE_SUPPORT
6704                 OUTL(nc_dsp, NCB_SCRIPT_PHYS (np, done_end) + 8);
6705 #else
6706                 OUTL(nc_dsp, NCB_SCRIPT_PHYS (np, start));
6707 #endif
6708                 return;
6709         case SIR_RESEL_NO_MSG_IN:
6710         case SIR_RESEL_NO_IDENTIFY:
6711                 /*
6712                 **      If devices reselecting without sending an IDENTIFY 
6713                 **      message still exist, this should help.
6714                 **      We just assume lun=0, 1 CCB, no tag.
6715                 */
6716                 if (tp->lp[0]) { 
6717                         OUTL_DSP (scr_to_cpu(tp->lp[0]->jump_ccb[0]));
6718                         return;
6719                 }
6720                 /* fall through */
6721         case SIR_RESEL_BAD_TARGET:      /* Will send a TARGET RESET message */
6722         case SIR_RESEL_BAD_LUN:         /* Will send a TARGET RESET message */
6723         case SIR_RESEL_BAD_I_T_L_Q:     /* Will send an ABORT TAG message   */
6724         case SIR_RESEL_BAD_I_T_L:       /* Will send an ABORT message       */
6725                 printk ("%s:%d: SIR %d, "
6726                         "incorrect nexus identification on reselection\n",
6727                         ncr_name (np), target, num);
6728                 goto out;
6729         case SIR_DONE_OVERFLOW:
6730                 printk ("%s:%d: SIR %d, "
6731                         "CCB done queue overflow\n",
6732                         ncr_name (np), target, num);
6733                 goto out;
6734         case SIR_BAD_STATUS:
6735                 cp = np->header.cp;
6736                 if (!cp || CCB_PHYS (cp, phys) != dsa)
6737                         goto out;
6738                 ncr_sir_to_redo(np, num, cp);
6739                 return;
6740         default:
6741                 /*
6742                 **      lookup the ccb
6743                 */
6744                 cp = np->ccb;
6745                 while (cp && (CCB_PHYS (cp, phys) != dsa))
6746                         cp = cp->link_ccb;
6747 
6748                 BUG_ON(!cp);
6749                 BUG_ON(cp != np->header.cp);
6750 
6751                 if (!cp || cp != np->header.cp)
6752                         goto out;
6753         }
6754 
6755         switch (num) {
6756 /*-----------------------------------------------------------------------------
6757 **
6758 **      Was Sie schon immer ueber transfermode negotiation wissen wollten ...
6759 **      ("Everything you've always wanted to know about transfer mode
6760 **        negotiation")
6761 **
6762 **      We try to negotiate sync and wide transfer only after
6763 **      a successful inquire command. We look at byte 7 of the
6764 **      inquire data to determine the capabilities of the target.
6765 **
6766 **      When we try to negotiate, we append the negotiation message
6767 **      to the identify and (maybe) simple tag message.
6768 **      The host status field is set to HS_NEGOTIATE to mark this
6769 **      situation.
6770 **
6771 **      If the target doesn't answer this message immediately
6772 **      (as required by the standard), the SIR_NEGO_FAIL interrupt
6773 **      will be raised eventually.
6774 **      The handler removes the HS_NEGOTIATE status, and sets the
6775 **      negotiated value to the default (async / nowide).
6776 **
6777 **      If we receive a matching answer immediately, we check it
6778 **      for validity, and set the values.
6779 **
6780 **      If we receive a Reject message immediately, we assume the
6781 **      negotiation has failed, and fall back to standard values.
6782 **
6783 **      If we receive a negotiation message while not in HS_NEGOTIATE
6784 **      state, it's a target initiated negotiation. We prepare a
6785 **      (hopefully) valid answer, set our parameters, and send back 
6786 **      this answer to the target.
6787 **
6788 **      If the target doesn't fetch the answer (no message out phase),
6789 **      we assume the negotiation has failed, and fall back to default
6790 **      settings.
6791 **
6792 **      When we set the values, we adjust them in all ccbs belonging 
6793 **      to this target, in the controller's register, and in the "phys"
6794 **      field of the controller's struct ncb.
6795 **
6796 **      Possible cases:            hs  sir   msg_in value  send   goto
6797 **      We try to negotiate:
6798 **      -> target doesn't msgin    NEG FAIL  noop   defa.  -      dispatch
6799 **      -> target rejected our msg NEG FAIL  reject defa.  -      dispatch
6800 **      -> target answered  (ok)   NEG SYNC  sdtr   set    -      clrack
6801 **      -> target answered (!ok)   NEG SYNC  sdtr   defa.  REJ--->msg_bad
6802 **      -> target answered  (ok)   NEG WIDE  wdtr   set    -      clrack
6803 **      -> target answered (!ok)   NEG WIDE  wdtr   defa.  REJ--->msg_bad
6804 **      -> any other msgin         NEG FAIL  noop   defa.  -      dispatch
6805 **
6806 **      Target tries to negotiate:
6807 **      -> incoming message        --- SYNC  sdtr   set    SDTR   -
6808 **      -> incoming message        --- WIDE  wdtr   set    WDTR   -
6809 **      We sent our answer:
6810 **      -> target doesn't msgout   --- PROTO ?      defa.  -      dispatch
6811 **
6812 **-----------------------------------------------------------------------------
6813 */
6814 
6815         case SIR_NEGO_FAILED:
6816                 /*-------------------------------------------------------
6817                 **
6818                 **      Negotiation failed.
6819                 **      Target doesn't send an answer message,
6820                 **      or target rejected our message.
6821                 **
6822                 **      Remove negotiation request.
6823                 **
6824                 **-------------------------------------------------------
6825                 */
6826                 OUTB (HS_PRT, HS_BUSY);
6827 
6828                 /* fall through */
6829 
6830         case SIR_NEGO_PROTO:
6831                 /*-------------------------------------------------------
6832                 **
6833                 **      Negotiation failed.
6834                 **      Target doesn't fetch the answer message.
6835                 **
6836                 **-------------------------------------------------------
6837                 */
6838 
6839                 if (DEBUG_FLAGS & DEBUG_NEGO) {
6840                         PRINT_ADDR(cp->cmd, "negotiation failed sir=%x "
6841                                         "status=%x.\n", num, cp->nego_status);
6842                 }
6843 
6844                 /*
6845                 **      any error in negotiation:
6846                 **      fall back to default mode.
6847                 */
6848                 switch (cp->nego_status) {
6849 
6850                 case NS_SYNC:
6851                         spi_period(starget) = 0;
6852                         spi_offset(starget) = 0;
6853                         ncr_setsync (np, cp, 0, 0xe0);
6854                         break;
6855 
6856                 case NS_WIDE:
6857                         spi_width(starget) = 0;
6858                         ncr_setwide (np, cp, 0, 0);
6859                         break;
6860 
6861                 }
6862                 np->msgin [0] = NOP;
6863                 np->msgout[0] = NOP;
6864                 cp->nego_status = 0;
6865                 break;
6866 
6867         case SIR_NEGO_SYNC:
6868                 if (DEBUG_FLAGS & DEBUG_NEGO) {
6869                         ncr_print_msg(cp, "sync msgin", np->msgin);
6870                 }
6871 
6872                 chg = 0;
6873                 per = np->msgin[3];
6874                 ofs = np->msgin[4];
6875                 if (ofs==0) per=255;
6876 
6877                 /*
6878                 **      if target sends SDTR message,
6879                 **            it CAN transfer synch.
6880                 */
6881 
6882                 if (ofs && starget)
6883                         spi_support_sync(starget) = 1;
6884 
6885                 /*
6886                 **      check values against driver limits.
6887                 */
6888 
6889                 if (per < np->minsync)
6890                         {chg = 1; per = np->minsync;}
6891                 if (per < tp->minsync)
6892                         {chg = 1; per = tp->minsync;}
6893                 if (ofs > tp->maxoffs)
6894                         {chg = 1; ofs = tp->maxoffs;}
6895 
6896                 /*
6897                 **      Check against controller limits.
6898                 */
6899                 fak     = 7;
6900                 scntl3  = 0;
6901                 if (ofs != 0) {
6902                         ncr_getsync(np, per, &fak, &scntl3);
6903                         if (fak > 7) {
6904                                 chg = 1;
6905                                 ofs = 0;
6906                         }
6907                 }
6908                 if (ofs == 0) {
6909                         fak     = 7;
6910                         per     = 0;
6911                         scntl3  = 0;
6912                         tp->minsync = 0;
6913                 }
6914 
6915                 if (DEBUG_FLAGS & DEBUG_NEGO) {
6916                         PRINT_ADDR(cp->cmd, "sync: per=%d scntl3=0x%x ofs=%d "
6917                                 "fak=%d chg=%d.\n", per, scntl3, ofs, fak, chg);
6918                 }
6919 
6920                 if (INB (HS_PRT) == HS_NEGOTIATE) {
6921                         OUTB (HS_PRT, HS_BUSY);
6922                         switch (cp->nego_status) {
6923 
6924                         case NS_SYNC:
6925                                 /* This was an answer message */
6926                                 if (chg) {
6927                                         /* Answer wasn't acceptable.  */
6928                                         spi_period(starget) = 0;
6929                                         spi_offset(starget) = 0;
6930                                         ncr_setsync(np, cp, 0, 0xe0);
6931                                         OUTL_DSP(NCB_SCRIPT_PHYS (np, msg_bad));
6932                                 } else {
6933                                         /* Answer is ok.  */
6934                                         spi_period(starget) = per;
6935                                         spi_offset(starget) = ofs;
6936                                         ncr_setsync(np, cp, scntl3, (fak<<5)|ofs);
6937                                         OUTL_DSP(NCB_SCRIPT_PHYS (np, clrack));
6938                                 }
6939                                 return;
6940 
6941                         case NS_WIDE:
6942                                 spi_width(starget) = 0;
6943                                 ncr_setwide(np, cp, 0, 0);
6944                                 break;
6945                         }
6946                 }
6947 
6948                 /*
6949                 **      It was a request. Set value and
6950                 **      prepare an answer message
6951                 */
6952 
6953                 spi_period(starget) = per;
6954                 spi_offset(starget) = ofs;
6955                 ncr_setsync(np, cp, scntl3, (fak<<5)|ofs);
6956 
6957                 spi_populate_sync_msg(np->msgout, per, ofs);
6958                 cp->nego_status = NS_SYNC;
6959 
6960                 if (DEBUG_FLAGS & DEBUG_NEGO) {
6961                         ncr_print_msg(cp, "sync msgout", np->msgout);
6962                 }
6963 
6964                 if (!ofs) {
6965                         OUTL_DSP (NCB_SCRIPT_PHYS (np, msg_bad));
6966                         return;
6967                 }
6968                 np->msgin [0] = NOP;
6969 
6970                 break;
6971 
6972         case SIR_NEGO_WIDE:
6973                 /*
6974                 **      Wide request message received.
6975                 */
6976                 if (DEBUG_FLAGS & DEBUG_NEGO) {
6977                         ncr_print_msg(cp, "wide msgin", np->msgin);
6978                 }
6979 
6980                 /*
6981                 **      get requested values.
6982                 */
6983 
6984                 chg  = 0;
6985                 wide = np->msgin[3];
6986 
6987                 /*
6988                 **      if target sends WDTR message,
6989                 **            it CAN transfer wide.
6990                 */
6991 
6992                 if (wide && starget)
6993                         spi_support_wide(starget) = 1;
6994 
6995                 /*
6996                 **      check values against driver limits.
6997                 */
6998 
6999                 if (wide > tp->usrwide)
7000                         {chg = 1; wide = tp->usrwide;}
7001 
7002                 if (DEBUG_FLAGS & DEBUG_NEGO) {
7003                         PRINT_ADDR(cp->cmd, "wide: wide=%d chg=%d.\n", wide,
7004                                         chg);
7005                 }
7006 
7007                 if (INB (HS_PRT) == HS_NEGOTIATE) {
7008                         OUTB (HS_PRT, HS_BUSY);
7009                         switch (cp->nego_status) {
7010 
7011                         case NS_WIDE:
7012                                 /*
7013                                 **      This was an answer message
7014                                 */
7015                                 if (chg) {
7016                                         /* Answer wasn't acceptable.  */
7017                                         spi_width(starget) = 0;
7018                                         ncr_setwide(np, cp, 0, 1);
7019                                         OUTL_DSP (NCB_SCRIPT_PHYS (np, msg_bad));
7020                                 } else {
7021                                         /* Answer is ok.  */
7022                                         spi_width(starget) = wide;
7023                                         ncr_setwide(np, cp, wide, 1);
7024                                         OUTL_DSP (NCB_SCRIPT_PHYS (np, clrack));
7025                                 }
7026                                 return;
7027 
7028                         case NS_SYNC:
7029                                 spi_period(starget) = 0;
7030                                 spi_offset(starget) = 0;
7031                                 ncr_setsync(np, cp, 0, 0xe0);
7032                                 break;
7033                         }
7034                 }
7035 
7036                 /*
7037                 **      It was a request, set value and
7038                 **      prepare an answer message
7039                 */
7040 
7041                 spi_width(starget) = wide;
7042                 ncr_setwide(np, cp, wide, 1);
7043                 spi_populate_width_msg(np->msgout, wide);
7044 
7045                 np->msgin [0] = NOP;
7046 
7047                 cp->nego_status = NS_WIDE;
7048 
7049                 if (DEBUG_FLAGS & DEBUG_NEGO) {
7050                         ncr_print_msg(cp, "wide msgout", np->msgin);
7051                 }
7052                 break;
7053 
7054 /*--------------------------------------------------------------------
7055 **
7056 **      Processing of special messages
7057 **
7058 **--------------------------------------------------------------------
7059 */
7060 
7061         case SIR_REJECT_RECEIVED:
7062                 /*-----------------------------------------------
7063                 **
7064                 **      We received a MESSAGE_REJECT.
7065                 **
7066                 **-----------------------------------------------
7067                 */
7068 
7069                 PRINT_ADDR(cp->cmd, "MESSAGE_REJECT received (%x:%x).\n",
7070                         (unsigned)scr_to_cpu(np->lastmsg), np->msgout[0]);
7071                 break;
7072 
7073         case SIR_REJECT_SENT:
7074                 /*-----------------------------------------------
7075                 **
7076                 **      We received an unknown message
7077                 **
7078                 **-----------------------------------------------
7079                 */
7080 
7081                 ncr_print_msg(cp, "MESSAGE_REJECT sent for", np->msgin);
7082                 break;
7083 
7084 /*--------------------------------------------------------------------
7085 **
7086 **      Processing of special messages
7087 **
7088 **--------------------------------------------------------------------
7089 */
7090 
7091         case SIR_IGN_RESIDUE:
7092                 /*-----------------------------------------------
7093                 **
7094                 **      We received an IGNORE RESIDUE message,
7095                 **      which couldn't be handled by the script.
7096                 **
7097                 **-----------------------------------------------
7098                 */
7099 
7100                 PRINT_ADDR(cp->cmd, "IGNORE_WIDE_RESIDUE received, but not yet "
7101                                 "implemented.\n");
7102                 break;
7103 #if 0
7104         case SIR_MISSING_SAVE:
7105                 /*-----------------------------------------------
7106                 **
7107                 **      We received an DISCONNECT message,
7108                 **      but the datapointer wasn't saved before.
7109                 **
7110                 **-----------------------------------------------
7111                 */
7112 
7113                 PRINT_ADDR(cp->cmd, "DISCONNECT received, but datapointer "
7114                                 "not saved: data=%x save=%x goal=%x.\n",
7115                         (unsigned) INL (nc_temp),
7116                         (unsigned) scr_to_cpu(np->header.savep),
7117                         (unsigned) scr_to_cpu(np->header.goalp));
7118                 break;
7119 #endif
7120         }
7121 
7122 out:
7123         OUTONB_STD ();
7124 }
7125 
7126 /*==========================================================
7127 **
7128 **
7129 **      Acquire a control block
7130 **
7131 **
7132 **==========================================================
7133 */
7134 
7135 static struct ccb *ncr_get_ccb(struct ncb *np, struct scsi_cmnd *cmd)
7136 {
7137         u_char tn = cmd->device->id;
7138         u_char ln = cmd->device->lun;
7139         struct tcb *tp = &np->target[tn];
7140         struct lcb *lp = tp->lp[ln];
7141         u_char tag = NO_TAG;
7142         struct ccb *cp = NULL;
7143 
7144         /*
7145         **      Lun structure available ?
7146         */
7147         if (lp) {
7148                 struct list_head *qp;
7149                 /*
7150                 **      Keep from using more tags than we can handle.
7151                 */
7152                 if (lp->usetags && lp->busyccbs >= lp->maxnxs)
7153                         return NULL;
7154 
7155                 /*
7156                 **      Allocate a new CCB if needed.
7157                 */
7158                 if (list_empty(&lp->free_ccbq))
7159                         ncr_alloc_ccb(np, tn, ln);
7160 
7161                 /*
7162                 **      Look for free CCB
7163                 */
7164                 qp = ncr_list_pop(&lp->free_ccbq);
7165                 if (qp) {
7166                         cp = list_entry(qp, struct ccb, link_ccbq);
7167                         if (cp->magic) {
7168                                 PRINT_ADDR(cmd, "ccb free list corrupted "
7169                                                 "(@%p)\n", cp);
7170                                 cp = NULL;
7171                         } else {
7172                                 list_add_tail(qp, &lp->wait_ccbq);
7173                                 ++lp->busyccbs;
7174                         }
7175                 }
7176 
7177                 /*
7178                 **      If a CCB is available,
7179                 **      Get a tag for this nexus if required.
7180                 */
7181                 if (cp) {
7182                         if (lp->usetags)
7183                                 tag = lp->cb_tags[lp->ia_tag];
7184                 }
7185                 else if (lp->actccbs > 0)
7186                         return NULL;
7187         }
7188 
7189         /*
7190         **      if nothing available, take the default.
7191         */
7192         if (!cp)
7193                 cp = np->ccb;
7194 
7195         /*
7196         **      Wait until available.
7197         */
7198 #if 0
7199         while (cp->magic) {
7200                 if (flags & SCSI_NOSLEEP) break;
7201                 if (tsleep ((caddr_t)cp, PRIBIO|PCATCH, "ncr", 0))
7202                         break;
7203         }
7204 #endif
7205 
7206         if (cp->magic)
7207                 return NULL;
7208 
7209         cp->magic = 1;
7210 
7211         /*
7212         **      Move to next available tag if tag used.
7213         */
7214         if (lp) {
7215                 if (tag != NO_TAG) {
7216                         ++lp->ia_tag;
7217                         if (lp->ia_tag == MAX_TAGS)
7218                                 lp->ia_tag = 0;
7219                         lp->tags_umap |= (((tagmap_t) 1) << tag);
7220                 }
7221         }
7222 
7223         /*
7224         **      Remember all informations needed to free this CCB.
7225         */
7226         cp->tag    = tag;
7227         cp->target = tn;
7228         cp->lun    = ln;
7229 
7230         if (DEBUG_FLAGS & DEBUG_TAGS) {
7231                 PRINT_ADDR(cmd, "ccb @%p using tag %d.\n", cp, tag);
7232         }
7233 
7234         return cp;
7235 }
7236 
7237 /*==========================================================
7238 **
7239 **
7240 **      Release one control block
7241 **
7242 **
7243 **==========================================================
7244 */
7245 
7246 static void ncr_free_ccb (struct ncb *np, struct ccb *cp)
7247 {
7248         struct tcb *tp = &np->target[cp->target];
7249         struct lcb *lp = tp->lp[cp->lun];
7250 
7251         if (DEBUG_FLAGS & DEBUG_TAGS) {
7252                 PRINT_ADDR(cp->cmd, "ccb @%p freeing tag %d.\n", cp, cp->tag);
7253         }
7254 
7255         /*
7256         **      If lun control block available,
7257         **      decrement active commands and increment credit, 
7258         **      free the tag if any and remove the JUMP for reselect.
7259         */
7260         if (lp) {
7261                 if (cp->tag != NO_TAG) {
7262                         lp->cb_tags[lp->if_tag++] = cp->tag;
7263                         if (lp->if_tag == MAX_TAGS)
7264                                 lp->if_tag = 0;
7265                         lp->tags_umap &= ~(((tagmap_t) 1) << cp->tag);
7266                         lp->tags_smap &= lp->tags_umap;
7267                         lp->jump_ccb[cp->tag] =
7268                                 cpu_to_scr(NCB_SCRIPTH_PHYS(np, bad_i_t_l_q));
7269                 } else {
7270                         lp->jump_ccb[0] =
7271                                 cpu_to_scr(NCB_SCRIPTH_PHYS(np, bad_i_t_l));
7272                 }
7273         }
7274 
7275         /*
7276         **      Make this CCB available.
7277         */
7278 
7279         if (lp) {
7280                 if (cp != np->ccb)
7281                         list_move(&cp->link_ccbq, &lp->free_ccbq);
7282                 --lp->busyccbs;
7283                 if (cp->queued) {
7284                         --lp->queuedccbs;
7285                 }
7286         }
7287         cp -> host_status = HS_IDLE;
7288         cp -> magic = 0;
7289         if (cp->queued) {
7290                 --np->queuedccbs;
7291                 cp->queued = 0;
7292         }
7293 
7294 #if 0
7295         if (cp == np->ccb)
7296                 wakeup ((caddr_t) cp);
7297 #endif
7298 }
7299 
7300 
7301 #define ncr_reg_bus_addr(r) (np->paddr + offsetof (struct ncr_reg, r))
7302 
7303 /*------------------------------------------------------------------------
7304 **      Initialize the fixed part of a CCB structure.
7305 **------------------------------------------------------------------------
7306 **------------------------------------------------------------------------
7307 */
7308 static void ncr_init_ccb(struct ncb *np, struct ccb *cp)
7309 {
7310         ncrcmd copy_4 = np->features & FE_PFEN ? SCR_COPY(4) : SCR_COPY_F(4);
7311 
7312         /*
7313         **      Remember virtual and bus address of this ccb.
7314         */
7315         cp->p_ccb          = vtobus(cp);
7316         cp->phys.header.cp = cp;
7317 
7318         /*
7319         **      This allows list_del to work for the default ccb.
7320         */
7321         INIT_LIST_HEAD(&cp->link_ccbq);
7322 
7323         /*
7324         **      Initialyze the start and restart launch script.
7325         **
7326         **      COPY(4) @(...p_phys), @(dsa)
7327         **      JUMP @(sched_point)
7328         */
7329         cp->start.setup_dsa[0]   = cpu_to_scr(copy_4);
7330         cp->start.setup_dsa[1]   = cpu_to_scr(CCB_PHYS(cp, start.p_phys));
7331         cp->start.setup_dsa[2]   = cpu_to_scr(ncr_reg_bus_addr(nc_dsa));
7332         cp->start.schedule.l_cmd = cpu_to_scr(SCR_JUMP);
7333         cp->start.p_phys         = cpu_to_scr(CCB_PHYS(cp, phys));
7334 
7335         memcpy(&cp->restart, &cp->start, sizeof(cp->restart));
7336 
7337         cp->start.schedule.l_paddr   = cpu_to_scr(NCB_SCRIPT_PHYS (np, idle));
7338         cp->restart.schedule.l_paddr = cpu_to_scr(NCB_SCRIPTH_PHYS (np, abort));
7339 }
7340 
7341 
7342 /*------------------------------------------------------------------------
7343 **      Allocate a CCB and initialize its fixed part.
7344 **------------------------------------------------------------------------
7345 **------------------------------------------------------------------------
7346 */
7347 static void ncr_alloc_ccb(struct ncb *np, u_char tn, u_char ln)
7348 {
7349         struct tcb *tp = &np->target[tn];
7350         struct lcb *lp = tp->lp[ln];
7351         struct ccb *cp = NULL;
7352 
7353         /*
7354         **      Allocate memory for this CCB.
7355         */
7356         cp = m_calloc_dma(sizeof(struct ccb), "CCB");
7357         if (!cp)
7358                 return;
7359 
7360         /*
7361         **      Count it and initialyze it.
7362         */
7363         lp->actccbs++;
7364         np->actccbs++;
7365         memset(cp, 0, sizeof (*cp));
7366         ncr_init_ccb(np, cp);
7367 
7368         /*
7369         **      Chain into wakeup list and free ccb queue and take it 
7370         **      into account for tagged commands.
7371         */
7372         cp->link_ccb      = np->ccb->link_ccb;
7373         np->ccb->link_ccb = cp;
7374 
7375         list_add(&cp->link_ccbq, &lp->free_ccbq);
7376 }
7377 
7378 /*==========================================================
7379 **
7380 **
7381 **      Allocation of resources for Targets/Luns/Tags.
7382 **
7383 **
7384 **==========================================================
7385 */
7386 
7387 
7388 /*------------------------------------------------------------------------
7389 **      Target control block initialisation.
7390 **------------------------------------------------------------------------
7391 **      This data structure is fully initialized after a SCSI command 
7392 **      has been successfully completed for this target.
7393 **      It contains a SCRIPT that is called on target reselection.
7394 **------------------------------------------------------------------------
7395 */
7396 static void ncr_init_tcb (struct ncb *np, u_char tn)
7397 {
7398         struct tcb *tp = &np->target[tn];
7399         ncrcmd copy_1 = np->features & FE_PFEN ? SCR_COPY(1) : SCR_COPY_F(1);
7400         int th = tn & 3;
7401         int i;
7402 
7403         /*
7404         **      Jump to next tcb if SFBR does not match this target.
7405         **      JUMP  IF (SFBR != #target#), @(next tcb)
7406         */
7407         tp->jump_tcb.l_cmd   =
7408                 cpu_to_scr((SCR_JUMP ^ IFFALSE (DATA (0x80 + tn))));
7409         tp->jump_tcb.l_paddr = np->jump_tcb[th].l_paddr;
7410 
7411         /*
7412         **      Load the synchronous transfer register.
7413         **      COPY @(tp->sval), @(sxfer)
7414         */
7415         tp->getscr[0] = cpu_to_scr(copy_1);
7416         tp->getscr[1] = cpu_to_scr(vtobus (&tp->sval));
7417 #ifdef SCSI_NCR_BIG_ENDIAN
7418         tp->getscr[2] = cpu_to_scr(ncr_reg_bus_addr(nc_sxfer) ^ 3);
7419 #else
7420         tp->getscr[2] = cpu_to_scr(ncr_reg_bus_addr(nc_sxfer));
7421 #endif
7422 
7423         /*
7424         **      Load the timing register.
7425         **      COPY @(tp->wval), @(scntl3)
7426         */
7427         tp->getscr[3] = cpu_to_scr(copy_1);
7428         tp->getscr[4] = cpu_to_scr(vtobus (&tp->wval));
7429 #ifdef SCSI_NCR_BIG_ENDIAN
7430         tp->getscr[5] = cpu_to_scr(ncr_reg_bus_addr(nc_scntl3) ^ 3);
7431 #else
7432         tp->getscr[5] = cpu_to_scr(ncr_reg_bus_addr(nc_scntl3));
7433 #endif
7434 
7435         /*
7436         **      Get the IDENTIFY message and the lun.
7437         **      CALL @script(resel_lun)
7438         */
7439         tp->call_lun.l_cmd   = cpu_to_scr(SCR_CALL);
7440         tp->call_lun.l_paddr = cpu_to_scr(NCB_SCRIPT_PHYS (np, resel_lun));
7441 
7442         /*
7443         **      Look for the lun control block of this nexus.
7444         **      For i = 0 to 3
7445         **              JUMP ^ IFTRUE (MASK (i, 3)), @(next_lcb)
7446         */
7447         for (i = 0 ; i < 4 ; i++) {
7448                 tp->jump_lcb[i].l_cmd   =
7449                                 cpu_to_scr((SCR_JUMP ^ IFTRUE (MASK (i, 3))));
7450                 tp->jump_lcb[i].l_paddr =
7451                                 cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_identify));
7452         }
7453 
7454         /*
7455         **      Link this target control block to the JUMP chain.
7456         */
7457         np->jump_tcb[th].l_paddr = cpu_to_scr(vtobus (&tp->jump_tcb));
7458 
7459         /*
7460         **      These assert's should be moved at driver initialisations.
7461         */
7462 #ifdef SCSI_NCR_BIG_ENDIAN
7463         BUG_ON(((offsetof(struct ncr_reg, nc_sxfer) ^
7464                  offsetof(struct tcb    , sval    )) &3) != 3);
7465         BUG_ON(((offsetof(struct ncr_reg, nc_scntl3) ^
7466                  offsetof(struct tcb    , wval    )) &3) != 3);
7467 #else
7468         BUG_ON(((offsetof(struct ncr_reg, nc_sxfer) ^
7469                  offsetof(struct tcb    , sval    )) &3) != 0);
7470         BUG_ON(((offsetof(struct ncr_reg, nc_scntl3) ^
7471                  offsetof(struct tcb    , wval    )) &3) != 0);
7472 #endif
7473 }
7474 
7475 
7476 /*------------------------------------------------------------------------
7477 **      Lun control block allocation and initialization.
7478 **------------------------------------------------------------------------
7479 **      This data structure is allocated and initialized after a SCSI 
7480 **      command has been successfully completed for this target/lun.
7481 **------------------------------------------------------------------------
7482 */
7483 static struct lcb *ncr_alloc_lcb (struct ncb *np, u_char tn, u_char ln)
7484 {
7485         struct tcb *tp = &np->target[tn];
7486         struct lcb *lp = tp->lp[ln];
7487         ncrcmd copy_4 = np->features & FE_PFEN ? SCR_COPY(4) : SCR_COPY_F(4);
7488         int lh = ln & 3;
7489 
7490         /*
7491         **      Already done, return.
7492         */
7493         if (lp)
7494                 return lp;
7495 
7496         /*
7497         **      Allocate the lcb.
7498         */
7499         lp = m_calloc_dma(sizeof(struct lcb), "LCB");
7500         if (!lp)
7501                 goto fail;
7502         memset(lp, 0, sizeof(*lp));
7503         tp->lp[ln] = lp;
7504 
7505         /*
7506         **      Initialize the target control block if not yet.
7507         */
7508         if (!tp->jump_tcb.l_cmd)
7509                 ncr_init_tcb(np, tn);
7510 
7511         /*
7512         **      Initialize the CCB queue headers.
7513         */
7514         INIT_LIST_HEAD(&lp->free_ccbq);
7515         INIT_LIST_HEAD(&lp->busy_ccbq);
7516         INIT_LIST_HEAD(&lp->wait_ccbq);
7517         INIT_LIST_HEAD(&lp->skip_ccbq);
7518 
7519         /*
7520         **      Set max CCBs to 1 and use the default 1 entry 
7521         **      jump table by default.
7522         */
7523         lp->maxnxs      = 1;
7524         lp->jump_ccb    = &lp->jump_ccb_0;
7525         lp->p_jump_ccb  = cpu_to_scr(vtobus(lp->jump_ccb));
7526 
7527         /*
7528         **      Initilialyze the reselect script:
7529         **
7530         **      Jump to next lcb if SFBR does not match this lun.
7531         **      Load TEMP with the CCB direct jump table bus address.
7532         **      Get the SIMPLE TAG message and the tag.
7533         **
7534         **      JUMP  IF (SFBR != #lun#), @(next lcb)
7535         **      COPY @(lp->p_jump_ccb),   @(temp)
7536         **      JUMP @script(resel_notag)
7537         */
7538         lp->jump_lcb.l_cmd   =
7539                 cpu_to_scr((SCR_JUMP ^ IFFALSE (MASK (0x80+ln, 0xff))));
7540         lp->jump_lcb.l_paddr = tp->jump_lcb[lh].l_paddr;
7541 
7542         lp->load_jump_ccb[0] = cpu_to_scr(copy_4);
7543         lp->load_jump_ccb[1] = cpu_to_scr(vtobus (&lp->p_jump_ccb));
7544         lp->load_jump_ccb[2] = cpu_to_scr(ncr_reg_bus_addr(nc_temp));
7545 
7546         lp->jump_tag.l_cmd   = cpu_to_scr(SCR_JUMP);
7547         lp->jump_tag.l_paddr = cpu_to_scr(NCB_SCRIPT_PHYS (np, resel_notag));
7548 
7549         /*
7550         **      Link this lun control block to the JUMP chain.
7551         */
7552         tp->jump_lcb[lh].l_paddr = cpu_to_scr(vtobus (&lp->jump_lcb));
7553 
7554         /*
7555         **      Initialize command queuing control.
7556         */
7557         lp->busyccbs    = 1;
7558         lp->queuedccbs  = 1;
7559         lp->queuedepth  = 1;
7560 fail:
7561         return lp;
7562 }
7563 
7564 
7565 /*------------------------------------------------------------------------
7566 **      Lun control block setup on INQUIRY data received.
7567 **------------------------------------------------------------------------
7568 **      We only support WIDE, SYNC for targets and CMDQ for logical units.
7569 **      This setup is done on each INQUIRY since we are expecting user 
7570 **      will play with CHANGE DEFINITION commands. :-)
7571 **------------------------------------------------------------------------
7572 */
7573 static struct lcb *ncr_setup_lcb (struct ncb *np, struct scsi_device *sdev)
7574 {
7575         unsigned char tn = sdev->id, ln = sdev->lun;
7576         struct tcb *tp = &np->target[tn];
7577         struct lcb *lp = tp->lp[ln];
7578 
7579         /* If no lcb, try to allocate it.  */
7580         if (!lp && !(lp = ncr_alloc_lcb(np, tn, ln)))
7581                 goto fail;
7582 
7583         /*
7584         **      If unit supports tagged commands, allocate the 
7585         **      CCB JUMP table if not yet.
7586         */
7587         if (sdev->tagged_supported && lp->jump_ccb == &lp->jump_ccb_0) {
7588                 int i;
7589                 lp->jump_ccb = m_calloc_dma(256, "JUMP_CCB");
7590                 if (!lp->jump_ccb) {
7591                         lp->jump_ccb = &lp->jump_ccb_0;
7592                         goto fail;
7593                 }
7594                 lp->p_jump_ccb = cpu_to_scr(vtobus(lp->jump_ccb));
7595                 for (i = 0 ; i < 64 ; i++)
7596                         lp->jump_ccb[i] =
7597                                 cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_i_t_l_q));
7598                 for (i = 0 ; i < MAX_TAGS ; i++)
7599                         lp->cb_tags[i] = i;
7600                 lp->maxnxs = MAX_TAGS;
7601                 lp->tags_stime = jiffies + 3*HZ;
7602                 ncr_setup_tags (np, sdev);
7603         }
7604 
7605 
7606 fail:
7607         return lp;
7608 }
7609 
7610 /*==========================================================
7611 **
7612 **
7613 **      Build Scatter Gather Block
7614 **
7615 **
7616 **==========================================================
7617 **
7618 **      The transfer area may be scattered among
7619 **      several non adjacent physical pages.
7620 **
7621 **      We may use MAX_SCATTER blocks.
7622 **
7623 **----------------------------------------------------------
7624 */
7625 
7626 /*
7627 **      We try to reduce the number of interrupts caused
7628 **      by unexpected phase changes due to disconnects.
7629 **      A typical harddisk may disconnect before ANY block.
7630 **      If we wanted to avoid unexpected phase changes at all
7631 **      we had to use a break point every 512 bytes.
7632 **      Of course the number of scatter/gather blocks is
7633 **      limited.
7634 **      Under Linux, the scatter/gatter blocks are provided by 
7635 **      the generic driver. We just have to copy addresses and 
7636 **      sizes to the data segment array.
7637 */
7638 
7639 static int ncr_scatter(struct ncb *np, struct ccb *cp, struct scsi_cmnd *cmd)
7640 {
7641         int segment     = 0;
7642         int use_sg      = scsi_sg_count(cmd);
7643 
7644         cp->data_len    = 0;
7645 
7646         use_sg = map_scsi_sg_data(np, cmd);
7647         if (use_sg > 0) {
7648                 struct scatterlist *sg;
7649                 struct scr_tblmove *data;
7650 
7651                 if (use_sg > MAX_SCATTER) {
7652                         unmap_scsi_data(np, cmd);
7653                         return -1;
7654                 }
7655 
7656                 data = &cp->phys.data[MAX_SCATTER - use_sg];
7657 
7658                 scsi_for_each_sg(cmd, sg, use_sg, segment) {
7659                         dma_addr_t baddr = sg_dma_address(sg);
7660                         unsigned int len = sg_dma_len(sg);
7661 
7662                         ncr_build_sge(np, &data[segment], baddr, len);
7663                         cp->data_len += len;
7664                 }
7665         } else
7666                 segment = -2;
7667 
7668         return segment;
7669 }
7670 
7671 /*==========================================================
7672 **
7673 **
7674 **      Test the bus snoop logic :-(
7675 **
7676 **      Has to be called with interrupts disabled.
7677 **
7678 **
7679 **==========================================================
7680 */
7681 
7682 static int __init ncr_regtest (struct ncb* np)
7683 {
7684         register volatile u32 data;
7685         /*
7686         **      ncr registers may NOT be cached.
7687         **      write 0xffffffff to a read only register area,
7688         **      and try to read it back.
7689         */
7690         data = 0xffffffff;
7691         OUTL_OFF(offsetof(struct ncr_reg, nc_dstat), data);
7692         data = INL_OFF(offsetof(struct ncr_reg, nc_dstat));
7693 #if 1
7694         if (data == 0xffffffff) {
7695 #else
7696         if ((data & 0xe2f0fffd) != 0x02000080) {
7697 #endif
7698                 printk ("CACHE TEST FAILED: reg dstat-sstat2 readback %x.\n",
7699                         (unsigned) data);
7700                 return (0x10);
7701         }
7702         return (0);
7703 }
7704 
7705 static int __init ncr_snooptest (struct ncb* np)
7706 {
7707         u32     ncr_rd, ncr_wr, ncr_bk, host_rd, host_wr, pc;
7708         int     i, err=0;
7709         if (np->reg) {
7710                 err |= ncr_regtest (np);
7711                 if (err)
7712                         return (err);
7713         }
7714 
7715         /* init */
7716         pc  = NCB_SCRIPTH_PHYS (np, snooptest);
7717         host_wr = 1;
7718         ncr_wr  = 2;
7719         /*
7720         **      Set memory and register.
7721         */
7722         np->ncr_cache = cpu_to_scr(host_wr);
7723         OUTL (nc_temp, ncr_wr);
7724         /*
7725         **      Start script (exchange values)
7726         */
7727         OUTL_DSP (pc);
7728         /*
7729         **      Wait 'til done (with timeout)
7730         */
7731         for (i=0; i<NCR_SNOOP_TIMEOUT; i++)
7732                 if (INB(nc_istat) & (INTF|SIP|DIP))
7733                         break;
7734         /*
7735         **      Save termination position.
7736         */
7737         pc = INL (nc_dsp);
7738         /*
7739         **      Read memory and register.
7740         */
7741         host_rd = scr_to_cpu(np->ncr_cache);
7742         ncr_rd  = INL (nc_scratcha);
7743         ncr_bk  = INL (nc_temp);
7744         /*
7745         **      Reset ncr chip
7746         */
7747         ncr_chip_reset(np, 100);
7748         /*
7749         **      check for timeout
7750         */
7751         if (i>=NCR_SNOOP_TIMEOUT) {
7752                 printk ("CACHE TEST FAILED: timeout.\n");
7753                 return (0x20);
7754         }
7755         /*
7756         **      Check termination position.
7757         */
7758         if (pc != NCB_SCRIPTH_PHYS (np, snoopend)+8) {
7759                 printk ("CACHE TEST FAILED: script execution failed.\n");
7760                 printk ("start=%08lx, pc=%08lx, end=%08lx\n", 
7761                         (u_long) NCB_SCRIPTH_PHYS (np, snooptest), (u_long) pc,
7762                         (u_long) NCB_SCRIPTH_PHYS (np, snoopend) +8);
7763                 return (0x40);
7764         }
7765         /*
7766         **      Show results.
7767         */
7768         if (host_wr != ncr_rd) {
7769                 printk ("CACHE TEST FAILED: host wrote %d, ncr read %d.\n",
7770                         (int) host_wr, (int) ncr_rd);
7771                 err |= 1;
7772         }
7773         if (host_rd != ncr_wr) {
7774                 printk ("CACHE TEST FAILED: ncr wrote %d, host read %d.\n",
7775                         (int) ncr_wr, (int) host_rd);
7776                 err |= 2;
7777         }
7778         if (ncr_bk != ncr_wr) {
7779                 printk ("CACHE TEST FAILED: ncr wrote %d, read back %d.\n",
7780                         (int) ncr_wr, (int) ncr_bk);
7781                 err |= 4;
7782         }
7783         return (err);
7784 }
7785 
7786 /*==========================================================
7787 **
7788 **      Determine the ncr's clock frequency.
7789 **      This is essential for the negotiation
7790 **      of the synchronous transfer rate.
7791 **
7792 **==========================================================
7793 **
7794 **      Note: we have to return the correct value.
7795 **      THERE IS NO SAFE DEFAULT VALUE.
7796 **
7797 **      Most NCR/SYMBIOS boards are delivered with a 40 Mhz clock.
7798 **      53C860 and 53C875 rev. 1 support fast20 transfers but 
7799 **      do not have a clock doubler and so are provided with a 
7800 **      80 MHz clock. All other fast20 boards incorporate a doubler 
7801 **      and so should be delivered with a 40 MHz clock.
7802 **      The future fast40 chips (895/895) use a 40 Mhz base clock 
7803 **      and provide a clock quadrupler (160 Mhz). The code below 
7804 **      tries to deal as cleverly as possible with all this stuff.
7805 **
7806 **----------------------------------------------------------
7807 */
7808 
7809 /*
7810  *      Select NCR SCSI clock frequency
7811  */
7812 static void ncr_selectclock(struct ncb *np, u_char scntl3)
7813 {
7814         if (np->multiplier < 2) {
7815                 OUTB(nc_scntl3, scntl3);
7816                 return;
7817         }
7818 
7819         if (bootverbose >= 2)
7820                 printk ("%s: enabling clock multiplier\n", ncr_name(np));
7821 
7822         OUTB(nc_stest1, DBLEN);    /* Enable clock multiplier             */
7823         if (np->multiplier > 2) {  /* Poll bit 5 of stest4 for quadrupler */
7824                 int i = 20;
7825                 while (!(INB(nc_stest4) & LCKFRQ) && --i > 0)
7826                         udelay(20);
7827                 if (!i)
7828                         printk("%s: the chip cannot lock the frequency\n", ncr_name(np));
7829         } else                  /* Wait 20 micro-seconds for doubler    */
7830                 udelay(20);
7831         OUTB(nc_stest3, HSC);           /* Halt the scsi clock          */
7832         OUTB(nc_scntl3, scntl3);
7833         OUTB(nc_stest1, (DBLEN|DBLSEL));/* Select clock multiplier      */
7834         OUTB(nc_stest3, 0x00);          /* Restart scsi clock           */
7835 }
7836 
7837 
7838 /*
7839  *      calculate NCR SCSI clock frequency (in KHz)
7840  */
7841 static unsigned __init ncrgetfreq (struct ncb *np, int gen)
7842 {
7843         unsigned ms = 0;
7844         char count = 0;
7845 
7846         /*
7847          * Measure GEN timer delay in order 
7848          * to calculate SCSI clock frequency
7849          *
7850          * This code will never execute too
7851          * many loop iterations (if DELAY is 
7852          * reasonably correct). It could get
7853          * too low a delay (too high a freq.)
7854          * if the CPU is slow executing the 
7855          * loop for some reason (an NMI, for
7856          * example). For this reason we will
7857          * if multiple measurements are to be 
7858          * performed trust the higher delay 
7859          * (lower frequency returned).
7860          */
7861         OUTB (nc_stest1, 0);    /* make sure clock doubler is OFF */
7862         OUTW (nc_sien , 0);     /* mask all scsi interrupts */
7863         (void) INW (nc_sist);   /* clear pending scsi interrupt */
7864         OUTB (nc_dien , 0);     /* mask all dma interrupts */
7865         (void) INW (nc_sist);   /* another one, just to be sure :) */
7866         OUTB (nc_scntl3, 4);    /* set pre-scaler to divide by 3 */
7867         OUTB (nc_stime1, 0);    /* disable general purpose timer */
7868         OUTB (nc_stime1, gen);  /* set to nominal delay of 1<<gen * 125us */
7869         while (!(INW(nc_sist) & GEN) && ms++ < 100000) {
7870                 for (count = 0; count < 10; count ++)
7871                         udelay(100);    /* count ms */
7872         }
7873         OUTB (nc_stime1, 0);    /* disable general purpose timer */
7874         /*
7875          * set prescaler to divide by whatever 0 means
7876          * 0 ought to choose divide by 2, but appears
7877          * to set divide by 3.5 mode in my 53c810 ...
7878          */
7879         OUTB (nc_scntl3, 0);
7880 
7881         if (bootverbose >= 2)
7882                 printk ("%s: Delay (GEN=%d): %u msec\n", ncr_name(np), gen, ms);
7883         /*
7884          * adjust for prescaler, and convert into KHz 
7885          */
7886         return ms ? ((1 << gen) * 4340) / ms : 0;
7887 }
7888 
7889 /*
7890  *      Get/probe NCR SCSI clock frequency
7891  */
7892 static void __init ncr_getclock (struct ncb *np, int mult)
7893 {
7894         unsigned char scntl3 = INB(nc_scntl3);
7895         unsigned char stest1 = INB(nc_stest1);
7896         unsigned f1;
7897 
7898         np->multiplier = 1;
7899         f1 = 40000;
7900 
7901         /*
7902         **      True with 875 or 895 with clock multiplier selected
7903         */
7904         if (mult > 1 && (stest1 & (DBLEN+DBLSEL)) == DBLEN+DBLSEL) {
7905                 if (bootverbose >= 2)
7906                         printk ("%s: clock multiplier found\n", ncr_name(np));
7907                 np->multiplier = mult;
7908         }
7909 
7910         /*
7911         **      If multiplier not found or scntl3 not 7,5,3,
7912         **      reset chip and get frequency from general purpose timer.
7913         **      Otherwise trust scntl3 BIOS setting.
7914         */
7915         if (np->multiplier != mult || (scntl3 & 7) < 3 || !(scntl3 & 1)) {
7916                 unsigned f2;
7917 
7918                 ncr_chip_reset(np, 5);
7919 
7920                 (void) ncrgetfreq (np, 11);     /* throw away first result */
7921                 f1 = ncrgetfreq (np, 11);
7922                 f2 = ncrgetfreq (np, 11);
7923 
7924                 if(bootverbose)
7925                         printk ("%s: NCR clock is %uKHz, %uKHz\n", ncr_name(np), f1, f2);
7926 
7927                 if (f1 > f2) f1 = f2;           /* trust lower result   */
7928 
7929                 if      (f1 <   45000)          f1 =  40000;
7930                 else if (f1 <   55000)          f1 =  50000;
7931                 else                            f1 =  80000;
7932 
7933                 if (f1 < 80000 && mult > 1) {
7934                         if (bootverbose >= 2)
7935                                 printk ("%s: clock multiplier assumed\n", ncr_name(np));
7936                         np->multiplier  = mult;
7937                 }
7938         } else {
7939                 if      ((scntl3 & 7) == 3)     f1 =  40000;
7940                 else if ((scntl3 & 7) == 5)     f1 =  80000;
7941                 else                            f1 = 160000;
7942 
7943                 f1 /= np->multiplier;
7944         }
7945 
7946         /*
7947         **      Compute controller synchronous parameters.
7948         */
7949         f1              *= np->multiplier;
7950         np->clock_khz   = f1;
7951 }
7952 
7953 /*===================== LINUX ENTRY POINTS SECTION ==========================*/
7954 
7955 static int ncr53c8xx_slave_alloc(struct scsi_device *device)
7956 {
7957         struct Scsi_Host *host = device->host;
7958         struct ncb *np = ((struct host_data *) host->hostdata)->ncb;
7959         struct tcb *tp = &np->target[device->id];
7960         tp->starget = device->sdev_target;
7961 
7962         return 0;
7963 }
7964 
7965 static int ncr53c8xx_slave_configure(struct scsi_device *device)
7966 {
7967         struct Scsi_Host *host = device->host;
7968         struct ncb *np = ((struct host_data *) host->hostdata)->ncb;
7969         struct tcb *tp = &np->target[device->id];
7970         struct lcb *lp = tp->lp[device->lun];
7971         int numtags, depth_to_use;
7972 
7973         ncr_setup_lcb(np, device);
7974 
7975         /*
7976         **      Select queue depth from driver setup.
7977         **      Donnot use more than configured by user.
7978         **      Use at least 2.
7979         **      Donnot use more than our maximum.
7980         */
7981         numtags = device_queue_depth(np->unit, device->id, device->lun);
7982         if (numtags > tp->usrtags)
7983                 numtags = tp->usrtags;
7984         if (!device->tagged_supported)
7985                 numtags = 1;
7986         depth_to_use = numtags;
7987         if (depth_to_use < 2)
7988                 depth_to_use = 2;
7989         if (depth_to_use > MAX_TAGS)
7990                 depth_to_use = MAX_TAGS;
7991 
7992         scsi_change_queue_depth(device, depth_to_use);
7993 
7994         /*
7995         **      Since the queue depth is not tunable under Linux,
7996         **      we need to know this value in order not to 
7997         **      announce stupid things to user.
7998         **
7999         **      XXX(hch): As of Linux 2.6 it certainly _is_ tunable..
8000         **                In fact we just tuned it, or did I miss
8001         **                something important? :)
8002         */
8003         if (lp) {
8004                 lp->numtags = lp->maxtags = numtags;
8005                 lp->scdev_depth = depth_to_use;
8006         }
8007         ncr_setup_tags (np, device);
8008 
8009 #ifdef DEBUG_NCR53C8XX
8010         printk("ncr53c8xx_select_queue_depth: host=%d, id=%d, lun=%d, depth=%d\n",
8011                np->unit, device->id, device->lun, depth_to_use);
8012 #endif
8013 
8014         if (spi_support_sync(device->sdev_target) &&
8015             !spi_initial_dv(device->sdev_target))
8016                 spi_dv_device(device);
8017         return 0;
8018 }
8019 
8020 static int ncr53c8xx_queue_command_lck (struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
8021 {
8022      struct ncb *np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
8023      unsigned long flags;
8024      int sts;
8025 
8026 #ifdef DEBUG_NCR53C8XX
8027 printk("ncr53c8xx_queue_command\n");
8028 #endif
8029 
8030      cmd->scsi_done     = done;
8031      cmd->host_scribble = NULL;
8032      cmd->__data_mapped = 0;
8033      cmd->__data_mapping = 0;
8034 
8035      spin_lock_irqsave(&np->smp_lock, flags);
8036 
8037      if ((sts = ncr_queue_command(np, cmd)) != DID_OK) {
8038           cmd->result = sts << 16;
8039 #ifdef DEBUG_NCR53C8XX
8040 printk("ncr53c8xx : command not queued - result=%d\n", sts);
8041 #endif
8042      }
8043 #ifdef DEBUG_NCR53C8XX
8044      else
8045 printk("ncr53c8xx : command successfully queued\n");
8046 #endif
8047 
8048      spin_unlock_irqrestore(&np->smp_lock, flags);
8049 
8050      if (sts != DID_OK) {
8051           unmap_scsi_data(np, cmd);
8052           done(cmd);
8053           sts = 0;
8054      }
8055 
8056      return sts;
8057 }
8058 
8059 static DEF_SCSI_QCMD(ncr53c8xx_queue_command)
8060 
8061 irqreturn_t ncr53c8xx_intr(int irq, void *dev_id)
8062 {
8063      unsigned long flags;
8064      struct Scsi_Host *shost = (struct Scsi_Host *)dev_id;
8065      struct host_data *host_data = (struct host_data *)shost->hostdata;
8066      struct ncb *np = host_data->ncb;
8067      struct scsi_cmnd *done_list;
8068 
8069 #ifdef DEBUG_NCR53C8XX
8070      printk("ncr53c8xx : interrupt received\n");
8071 #endif
8072 
8073      if (DEBUG_FLAGS & DEBUG_TINY) printk ("[");
8074 
8075      spin_lock_irqsave(&np->smp_lock, flags);
8076      ncr_exception(np);
8077      done_list     = np->done_list;
8078      np->done_list = NULL;
8079      spin_unlock_irqrestore(&np->smp_lock, flags);
8080 
8081      if (DEBUG_FLAGS & DEBUG_TINY) printk ("]\n");
8082 
8083      if (done_list)
8084              ncr_flush_done_cmds(done_list);
8085      return IRQ_HANDLED;
8086 }
8087 
8088 static void ncr53c8xx_timeout(struct timer_list *t)
8089 {
8090         struct ncb *np = from_timer(np, t, timer);
8091         unsigned long flags;
8092         struct scsi_cmnd *done_list;
8093 
8094         spin_lock_irqsave(&np->smp_lock, flags);
8095         ncr_timeout(np);
8096         done_list     = np->done_list;
8097         np->done_list = NULL;
8098         spin_unlock_irqrestore(&np->smp_lock, flags);
8099 
8100         if (done_list)
8101                 ncr_flush_done_cmds(done_list);
8102 }
8103 
8104 static int ncr53c8xx_bus_reset(struct scsi_cmnd *cmd)
8105 {
8106         struct ncb *np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
8107         int sts;
8108         unsigned long flags;
8109         struct scsi_cmnd *done_list;
8110 
8111         /*
8112          * If the mid-level driver told us reset is synchronous, it seems 
8113          * that we must call the done() callback for the involved command, 
8114          * even if this command was not queued to the low-level driver, 
8115          * before returning SUCCESS.
8116          */
8117 
8118         spin_lock_irqsave(&np->smp_lock, flags);
8119         sts = ncr_reset_bus(np, cmd, 1);
8120 
8121         done_list     = np->done_list;
8122         np->done_list = NULL;
8123         spin_unlock_irqrestore(&np->smp_lock, flags);
8124 
8125         ncr_flush_done_cmds(done_list);
8126 
8127         return sts;
8128 }
8129 
8130 #if 0 /* unused and broken */
8131 static int ncr53c8xx_abort(struct scsi_cmnd *cmd)
8132 {
8133         struct ncb *np = ((struct host_data *) cmd->device->host->hostdata)->ncb;
8134         int sts;
8135         unsigned long flags;
8136         struct scsi_cmnd *done_list;
8137 
8138         printk("ncr53c8xx_abort\n");
8139 
8140         NCR_LOCK_NCB(np, flags);
8141 
8142         sts = ncr_abort_command(np, cmd);
8143 out:
8144         done_list     = np->done_list;
8145         np->done_list = NULL;
8146         NCR_UNLOCK_NCB(np, flags);
8147 
8148         ncr_flush_done_cmds(done_list);
8149 
8150         return sts;
8151 }
8152 #endif
8153 
8154 
8155 /*
8156 **      Scsi command waiting list management.
8157 **
8158 **      It may happen that we cannot insert a scsi command into the start queue,
8159 **      in the following circumstances.
8160 **              Too few preallocated ccb(s), 
8161 **              maxtags < cmd_per_lun of the Linux host control block,
8162 **              etc...
8163 **      Such scsi commands are inserted into a waiting list.
8164 **      When a scsi command complete, we try to requeue the commands of the
8165 **      waiting list.
8166 */
8167 
8168 #define next_wcmd host_scribble
8169 
8170 static void insert_into_waiting_list(struct ncb *np, struct scsi_cmnd *cmd)
8171 {
8172         struct scsi_cmnd *wcmd;
8173 
8174 #ifdef DEBUG_WAITING_LIST
8175         printk("%s: cmd %lx inserted into waiting list\n", ncr_name(np), (u_long) cmd);
8176 #endif
8177         cmd->next_wcmd = NULL;
8178         if (!(wcmd = np->waiting_list)) np->waiting_list = cmd;
8179         else {
8180                 while (wcmd->next_wcmd)
8181                         wcmd = (struct scsi_cmnd *) wcmd->next_wcmd;
8182                 wcmd->next_wcmd = (char *) cmd;
8183         }
8184 }
8185 
8186 static struct scsi_cmnd *retrieve_from_waiting_list(int to_remove, struct ncb *np, struct scsi_cmnd *cmd)
8187 {
8188         struct scsi_cmnd **pcmd = &np->waiting_list;
8189 
8190         while (*pcmd) {
8191                 if (cmd == *pcmd) {
8192                         if (to_remove) {
8193                                 *pcmd = (struct scsi_cmnd *) cmd->next_wcmd;
8194                                 cmd->next_wcmd = NULL;
8195                         }
8196 #ifdef DEBUG_WAITING_LIST
8197         printk("%s: cmd %lx retrieved from waiting list\n", ncr_name(np), (u_long) cmd);
8198 #endif
8199                         return cmd;
8200                 }
8201                 pcmd = (struct scsi_cmnd **) &(*pcmd)->next_wcmd;
8202         }
8203         return NULL;
8204 }
8205 
8206 static void process_waiting_list(struct ncb *np, int sts)
8207 {
8208         struct scsi_cmnd *waiting_list, *wcmd;
8209 
8210         waiting_list = np->waiting_list;
8211         np->waiting_list = NULL;
8212 
8213 #ifdef DEBUG_WAITING_LIST
8214         if (waiting_list) printk("%s: waiting_list=%lx processing sts=%d\n", ncr_name(np), (u_long) waiting_list, sts);
8215 #endif
8216         while ((wcmd = waiting_list) != NULL) {
8217                 waiting_list = (struct scsi_cmnd *) wcmd->next_wcmd;
8218                 wcmd->next_wcmd = NULL;
8219                 if (sts == DID_OK) {
8220 #ifdef DEBUG_WAITING_LIST
8221         printk("%s: cmd %lx trying to requeue\n", ncr_name(np), (u_long) wcmd);
8222 #endif
8223                         sts = ncr_queue_command(np, wcmd);
8224                 }
8225                 if (sts != DID_OK) {
8226 #ifdef DEBUG_WAITING_LIST
8227         printk("%s: cmd %lx done forced sts=%d\n", ncr_name(np), (u_long) wcmd, sts);
8228 #endif
8229                         wcmd->result = sts << 16;
8230                         ncr_queue_done_cmd(np, wcmd);
8231                 }
8232         }
8233 }
8234 
8235 #undef next_wcmd
8236 
8237 static ssize_t show_ncr53c8xx_revision(struct device *dev,
8238                                        struct device_attribute *attr, char *buf)
8239 {
8240         struct Scsi_Host *host = class_to_shost(dev);
8241         struct host_data *host_data = (struct host_data *)host->hostdata;
8242   
8243         return snprintf(buf, 20, "0x%x\n", host_data->ncb->revision_id);
8244 }
8245   
8246 static struct device_attribute ncr53c8xx_revision_attr = {
8247         .attr   = { .name = "revision", .mode = S_IRUGO, },
8248         .show   = show_ncr53c8xx_revision,
8249 };
8250   
8251 static struct device_attribute *ncr53c8xx_host_attrs[] = {
8252         &ncr53c8xx_revision_attr,
8253         NULL
8254 };
8255 
8256 /*==========================================================
8257 **
8258 **      Boot command line.
8259 **
8260 **==========================================================
8261 */
8262 #ifdef  MODULE
8263 char *ncr53c8xx;        /* command line passed by insmod */
8264 module_param(ncr53c8xx, charp, 0);
8265 #endif
8266 
8267 #ifndef MODULE
8268 static int __init ncr53c8xx_setup(char *str)
8269 {
8270         return sym53c8xx__setup(str);
8271 }
8272 
8273 __setup("ncr53c8xx=", ncr53c8xx_setup);
8274 #endif
8275 
8276 
8277 /*
8278  *      Host attach and initialisations.
8279  *
8280  *      Allocate host data and ncb structure.
8281  *      Request IO region and remap MMIO region.
8282  *      Do chip initialization.
8283  *      If all is OK, install interrupt handling and
8284  *      start the timer daemon.
8285  */
8286 struct Scsi_Host * __init ncr_attach(struct scsi_host_template *tpnt,
8287                                         int unit, struct ncr_device *device)
8288 {
8289         struct host_data *host_data;
8290         struct ncb *np = NULL;
8291         struct Scsi_Host *instance = NULL;
8292         u_long flags = 0;
8293         int i;
8294 
8295         if (!tpnt->name)
8296                 tpnt->name      = SCSI_NCR_DRIVER_NAME;
8297         if (!tpnt->shost_attrs)
8298                 tpnt->shost_attrs = ncr53c8xx_host_attrs;
8299 
8300         tpnt->queuecommand      = ncr53c8xx_queue_command;
8301         tpnt->slave_configure   = ncr53c8xx_slave_configure;
8302         tpnt->slave_alloc       = ncr53c8xx_slave_alloc;
8303         tpnt->eh_bus_reset_handler = ncr53c8xx_bus_reset;
8304         tpnt->can_queue         = SCSI_NCR_CAN_QUEUE;
8305         tpnt->this_id           = 7;
8306         tpnt->sg_tablesize      = SCSI_NCR_SG_TABLESIZE;
8307         tpnt->cmd_per_lun       = SCSI_NCR_CMD_PER_LUN;
8308 
8309         if (device->differential)
8310                 driver_setup.diff_support = device->differential;
8311 
8312         printk(KERN_INFO "ncr53c720-%d: rev 0x%x irq %d\n",
8313                 unit, device->chip.revision_id, device->slot.irq);
8314 
8315         instance = scsi_host_alloc(tpnt, sizeof(*host_data));
8316         if (!instance)
8317                 goto attach_error;
8318         host_data = (struct host_data *) instance->hostdata;
8319 
8320         np = __m_calloc_dma(device->dev, sizeof(struct ncb), "NCB");
8321         if (!np)
8322                 goto attach_error;
8323         spin_lock_init(&np->smp_lock);
8324         np->dev = device->dev;
8325         np->p_ncb = vtobus(np);
8326         host_data->ncb = np;
8327 
8328         np->ccb = m_calloc_dma(sizeof(struct ccb), "CCB");
8329         if (!np->ccb)
8330                 goto attach_error;
8331 
8332         /* Store input information in the host data structure.  */
8333         np->unit        = unit;
8334         np->verbose     = driver_setup.verbose;
8335         sprintf(np->inst_name, "ncr53c720-%d", np->unit);
8336         np->revision_id = device->chip.revision_id;
8337         np->features    = device->chip.features;
8338         np->clock_divn  = device->chip.nr_divisor;
8339         np->maxoffs     = device->chip.offset_max;
8340         np->maxburst    = device->chip.burst_max;
8341         np->myaddr      = device->host_id;
8342 
8343         /* Allocate SCRIPTS areas.  */
8344         np->script0 = m_calloc_dma(sizeof(struct script), "SCRIPT");
8345         if (!np->script0)
8346                 goto attach_error;
8347         np->scripth0 = m_calloc_dma(sizeof(struct scripth), "SCRIPTH");
8348         if (!np->scripth0)
8349                 goto attach_error;
8350 
8351         timer_setup(&np->timer, ncr53c8xx_timeout, 0);
8352 
8353         /* Try to map the controller chip to virtual and physical memory. */
8354 
8355         np->paddr       = device->slot.base;
8356         np->paddr2      = (np->features & FE_RAM) ? device->slot.base_2 : 0;
8357 
8358         if (device->slot.base_v)
8359                 np->vaddr = device->slot.base_v;
8360         else
8361                 np->vaddr = ioremap(device->slot.base_c, 128);
8362 
8363         if (!np->vaddr) {
8364                 printk(KERN_ERR
8365                         "%s: can't map memory mapped IO region\n",ncr_name(np));
8366                 goto attach_error;
8367         } else {
8368                 if (bootverbose > 1)
8369                         printk(KERN_INFO
8370                                 "%s: using memory mapped IO at virtual address 0x%lx\n", ncr_name(np), (u_long) np->vaddr);
8371         }
8372 
8373         /* Make the controller's registers available.  Now the INB INW INL
8374          * OUTB OUTW OUTL macros can be used safely.
8375          */
8376 
8377         np->reg = (struct ncr_reg __iomem *)np->vaddr;
8378 
8379         /* Do chip dependent initialization.  */
8380         ncr_prepare_setting(np);
8381 
8382         if (np->paddr2 && sizeof(struct script) > 4096) {
8383                 np->paddr2 = 0;
8384                 printk(KERN_WARNING "%s: script too large, NOT using on chip RAM.\n",
8385                         ncr_name(np));
8386         }
8387 
8388         instance->max_channel   = 0;
8389         instance->this_id       = np->myaddr;
8390         instance->max_id        = np->maxwide ? 16 : 8;
8391         instance->max_lun       = SCSI_NCR_MAX_LUN;
8392         instance->base          = (unsigned long) np->reg;
8393         instance->irq           = device->slot.irq;
8394         instance->unique_id     = device->slot.base;
8395         instance->dma_channel   = 0;
8396         instance->cmd_per_lun   = MAX_TAGS;
8397         instance->can_queue     = (MAX_START-4);
8398         /* This can happen if you forget to call ncr53c8xx_init from
8399          * your module_init */
8400         BUG_ON(!ncr53c8xx_transport_template);
8401         instance->transportt    = ncr53c8xx_transport_template;
8402 
8403         /* Patch script to physical addresses */
8404         ncr_script_fill(&script0, &scripth0);
8405 
8406         np->scripth     = np->scripth0;
8407         np->p_scripth   = vtobus(np->scripth);
8408         np->p_script    = (np->paddr2) ?  np->paddr2 : vtobus(np->script0);
8409 
8410         ncr_script_copy_and_bind(np, (ncrcmd *) &script0,
8411                         (ncrcmd *) np->script0, sizeof(struct script));
8412         ncr_script_copy_and_bind(np, (ncrcmd *) &scripth0,
8413                         (ncrcmd *) np->scripth0, sizeof(struct scripth));
8414         np->ccb->p_ccb  = vtobus (np->ccb);
8415 
8416         /* Patch the script for LED support.  */
8417 
8418         if (np->features & FE_LED0) {
8419                 np->script0->idle[0]  =
8420                                 cpu_to_scr(SCR_REG_REG(gpreg, SCR_OR,  0x01));
8421                 np->script0->reselected[0] =
8422                                 cpu_to_scr(SCR_REG_REG(gpreg, SCR_AND, 0xfe));
8423                 np->script0->start[0] =
8424                                 cpu_to_scr(SCR_REG_REG(gpreg, SCR_AND, 0xfe));
8425         }
8426 
8427         /*
8428          * Look for the target control block of this nexus.
8429          * For i = 0 to 3
8430          *   JUMP ^ IFTRUE (MASK (i, 3)), @(next_lcb)
8431          */
8432         for (i = 0 ; i < 4 ; i++) {
8433                 np->jump_tcb[i].l_cmd   =
8434                                 cpu_to_scr((SCR_JUMP ^ IFTRUE (MASK (i, 3))));
8435                 np->jump_tcb[i].l_paddr =
8436                                 cpu_to_scr(NCB_SCRIPTH_PHYS (np, bad_target));
8437         }
8438 
8439         ncr_chip_reset(np, 100);
8440 
8441         /* Now check the cache handling of the chipset.  */
8442 
8443         if (ncr_snooptest(np)) {
8444                 printk(KERN_ERR "CACHE INCORRECTLY CONFIGURED.\n");
8445                 goto attach_error;
8446         }
8447 
8448         /* Install the interrupt handler.  */
8449         np->irq = device->slot.irq;
8450 
8451         /* Initialize the fixed part of the default ccb.  */
8452         ncr_init_ccb(np, np->ccb);
8453 
8454         /*
8455          * After SCSI devices have been opened, we cannot reset the bus
8456          * safely, so we do it here.  Interrupt handler does the real work.
8457          * Process the reset exception if interrupts are not enabled yet.
8458          * Then enable disconnects.
8459          */
8460         spin_lock_irqsave(&np->smp_lock, flags);
8461         if (ncr_reset_scsi_bus(np, 0, driver_setup.settle_delay) != 0) {
8462                 printk(KERN_ERR "%s: FATAL ERROR: CHECK SCSI BUS - CABLES, TERMINATION, DEVICE POWER etc.!\n", ncr_name(np));
8463 
8464                 spin_unlock_irqrestore(&np->smp_lock, flags);
8465                 goto attach_error;
8466         }
8467         ncr_exception(np);
8468 
8469         np->disc = 1;
8470 
8471         /*
8472          * The middle-level SCSI driver does not wait for devices to settle.
8473          * Wait synchronously if more than 2 seconds.
8474          */
8475         if (driver_setup.settle_delay > 2) {
8476                 printk(KERN_INFO "%s: waiting %d seconds for scsi devices to settle...\n",
8477                         ncr_name(np), driver_setup.settle_delay);
8478                 mdelay(1000 * driver_setup.settle_delay);
8479         }
8480 
8481         /* start the timeout daemon */
8482         np->lasttime=0;
8483         ncr_timeout (np);
8484 
8485         /* use SIMPLE TAG messages by default */
8486 #ifdef SCSI_NCR_ALWAYS_SIMPLE_TAG
8487         np->order = SIMPLE_QUEUE_TAG;
8488 #endif
8489 
8490         spin_unlock_irqrestore(&np->smp_lock, flags);
8491 
8492         return instance;
8493 
8494  attach_error:
8495         if (!instance)
8496                 return NULL;
8497         printk(KERN_INFO "%s: detaching...\n", ncr_name(np));
8498         if (!np)
8499                 goto unregister;
8500         if (np->scripth0)
8501                 m_free_dma(np->scripth0, sizeof(struct scripth), "SCRIPTH");
8502         if (np->script0)
8503                 m_free_dma(np->script0, sizeof(struct script), "SCRIPT");
8504         if (np->ccb)
8505                 m_free_dma(np->ccb, sizeof(struct ccb), "CCB");
8506         m_free_dma(np, sizeof(struct ncb), "NCB");
8507         host_data->ncb = NULL;
8508 
8509  unregister:
8510         scsi_host_put(instance);
8511 
8512         return NULL;
8513 }
8514 
8515 
8516 void ncr53c8xx_release(struct Scsi_Host *host)
8517 {
8518         struct host_data *host_data = shost_priv(host);
8519 #ifdef DEBUG_NCR53C8XX
8520         printk("ncr53c8xx: release\n");
8521 #endif
8522         if (host_data->ncb)
8523                 ncr_detach(host_data->ncb);
8524         scsi_host_put(host);
8525 }
8526 
8527 static void ncr53c8xx_set_period(struct scsi_target *starget, int period)
8528 {
8529         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
8530         struct ncb *np = ((struct host_data *)shost->hostdata)->ncb;
8531         struct tcb *tp = &np->target[starget->id];
8532 
8533         if (period > np->maxsync)
8534                 period = np->maxsync;
8535         else if (period < np->minsync)
8536                 period = np->minsync;
8537 
8538         tp->usrsync = period;
8539 
8540         ncr_negotiate(np, tp);
8541 }
8542 
8543 static void ncr53c8xx_set_offset(struct scsi_target *starget, int offset)
8544 {
8545         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
8546         struct ncb *np = ((struct host_data *)shost->hostdata)->ncb;
8547         struct tcb *tp = &np->target[starget->id];
8548 
8549         if (offset > np->maxoffs)
8550                 offset = np->maxoffs;
8551         else if (offset < 0)
8552                 offset = 0;
8553 
8554         tp->maxoffs = offset;
8555 
8556         ncr_negotiate(np, tp);
8557 }
8558 
8559 static void ncr53c8xx_set_width(struct scsi_target *starget, int width)
8560 {
8561         struct Scsi_Host *shost = dev_to_shost(starget->dev.parent);
8562         struct ncb *np = ((struct host_data *)shost->hostdata)->ncb;
8563         struct tcb *tp = &np->target[starget->id];
8564 
8565         if (width > np->maxwide)
8566                 width = np->maxwide;
8567         else if (width < 0)
8568                 width = 0;
8569 
8570         tp->usrwide = width;
8571 
8572         ncr_negotiate(np, tp);
8573 }
8574 
8575 static void ncr53c8xx_get_signalling(struct Scsi_Host *shost)
8576 {
8577         struct ncb *np = ((struct host_data *)shost->hostdata)->ncb;
8578         enum spi_signal_type type;
8579 
8580         switch (np->scsi_mode) {
8581         case SMODE_SE:
8582                 type = SPI_SIGNAL_SE;
8583                 break;
8584         case SMODE_HVD:
8585                 type = SPI_SIGNAL_HVD;
8586                 break;
8587         default:
8588                 type = SPI_SIGNAL_UNKNOWN;
8589                 break;
8590         }
8591         spi_signalling(shost) = type;
8592 }
8593 
8594 static struct spi_function_template ncr53c8xx_transport_functions =  {
8595         .set_period     = ncr53c8xx_set_period,
8596         .show_period    = 1,
8597         .set_offset     = ncr53c8xx_set_offset,
8598         .show_offset    = 1,
8599         .set_width      = ncr53c8xx_set_width,
8600         .show_width     = 1,
8601         .get_signalling = ncr53c8xx_get_signalling,
8602 };
8603 
8604 int __init ncr53c8xx_init(void)
8605 {
8606         ncr53c8xx_transport_template = spi_attach_transport(&ncr53c8xx_transport_functions);
8607         if (!ncr53c8xx_transport_template)
8608                 return -ENODEV;
8609         return 0;
8610 }
8611 
8612 void ncr53c8xx_exit(void)
8613 {
8614         spi_release_transport(ncr53c8xx_transport_template);
8615 }

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