drivers/ide/cmd640.c

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This source file includes following definitions.
put_cmd640_reg_pci1
get_cmd640_reg_pci1
put_cmd640_reg_pci2
get_cmd640_reg_pci2
put_cmd640_reg_vlb
get_cmd640_reg_vlb
get_cmd640_reg
put_cmd640_reg
match_pci_cmd640_device
probe_for_cmd640_pci1
probe_for_cmd640_pci2
probe_for_cmd640_vlb
secondary_port_responding
cmd640_dump_regs
__set_prefetch_mode
check_prefetch
set_prefetch_mode
display_clocks
pack_nibbles
program_drive_counts
cmd640_set_mode
cmd640_set_pio_mode
cmd640_init_dev
cmd640_test_irq
pci_conf1
pci_conf2
cmd640x_init_one
cmd640x_init
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  Copyright (C) 1995-1996  Linus Torvalds & authors (see below)
   4  */
   5 
   6 /*
   7  *  Original authors:   abramov@cecmow.enet.dec.com (Igor Abramov)
   8  *                      mlord@pobox.com (Mark Lord)
   9  *
  10  *  See linux/MAINTAINERS for address of current maintainer.
  11  *
  12  *  This file provides support for the advanced features and bugs
  13  *  of IDE interfaces using the CMD Technologies 0640 IDE interface chip.
  14  *
  15  *  These chips are basically fucked by design, and getting this driver
  16  *  to work on every motherboard design that uses this screwed chip seems
  17  *  bloody well impossible.  However, we're still trying.
  18  *
  19  *  Version 0.97 worked for everybody.
  20  *
  21  *  User feedback is essential.  Many thanks to the beta test team:
  22  *
  23  *  A.Hartgers@stud.tue.nl, JZDQC@CUNYVM.CUNY.edu, abramov@cecmow.enet.dec.com,
  24  *  bardj@utopia.ppp.sn.no, bart@gaga.tue.nl, bbol001@cs.auckland.ac.nz,
  25  *  chrisc@dbass.demon.co.uk, dalecki@namu26.Num.Math.Uni-Goettingen.de,
  26  *  derekn@vw.ece.cmu.edu, florian@btp2x3.phy.uni-bayreuth.de,
  27  *  flynn@dei.unipd.it, gadio@netvision.net.il, godzilla@futuris.net,
  28  *  j@pobox.com, jkemp1@mises.uni-paderborn.de, jtoppe@hiwaay.net,
  29  *  kerouac@ssnet.com, meskes@informatik.rwth-aachen.de, hzoli@cs.elte.hu,
  30  *  peter@udgaard.isgtec.com, phil@tazenda.demon.co.uk, roadcapw@cfw.com,
  31  *  s0033las@sun10.vsz.bme.hu, schaffer@tam.cornell.edu, sjd@slip.net,
  32  *  steve@ei.org, ulrpeg@bigcomm.gun.de, ism@tardis.ed.ac.uk, mack@cray.com
  33  *  liug@mama.indstate.edu, and others.
  34  *
  35  *  Version 0.01        Initial version, hacked out of ide.c,
  36  *                      and #include'd rather than compiled separately.
  37  *                      This will get cleaned up in a subsequent release.
  38  *
  39  *  Version 0.02        Fixes for vlb initialization code, enable prefetch
  40  *                      for versions 'B' and 'C' of chip by default,
  41  *                      some code cleanup.
  42  *
  43  *  Version 0.03        Added reset of secondary interface,
  44  *                      and black list for devices which are not compatible
  45  *                      with prefetch mode. Separate function for setting
  46  *                      prefetch is added, possibly it will be called some
  47  *                      day from ioctl processing code.
  48  *
  49  *  Version 0.04        Now configs/compiles separate from ide.c
  50  *
  51  *  Version 0.05        Major rewrite of interface timing code.
  52  *                      Added new function cmd640_set_mode to set PIO mode
  53  *                      from ioctl call. New drives added to black list.
  54  *
  55  *  Version 0.06        More code cleanup. Prefetch is enabled only for
  56  *                      detected hard drives, not included in prefetch
  57  *                      black list.
  58  *
  59  *  Version 0.07        Changed to more conservative drive tuning policy.
  60  *                      Unknown drives, which report PIO < 4 are set to
  61  *                      (reported_PIO - 1) if it is supported, or to PIO0.
  62  *                      List of known drives extended by info provided by
  63  *                      CMD at their ftp site.
  64  *
  65  *  Version 0.08        Added autotune/noautotune support.
  66  *
  67  *  Version 0.09        Try to be smarter about 2nd port enabling.
  68  *  Version 0.10        Be nice and don't reset 2nd port.
  69  *  Version 0.11        Try to handle more weird situations.
  70  *
  71  *  Version 0.12        Lots of bug fixes from Laszlo Peter
  72  *                      irq unmasking disabled for reliability.
  73  *                      try to be even smarter about the second port.
  74  *                      tidy up source code formatting.
  75  *  Version 0.13        permit irq unmasking again.
  76  *  Version 0.90        massive code cleanup, some bugs fixed.
  77  *                      defaults all drives to PIO mode0, prefetch off.
  78  *                      autotune is OFF by default, with compile time flag.
  79  *                      prefetch can be turned OFF/ON using "hdparm -p8/-p9"
  80  *                       (requires hdparm-3.1 or newer)
  81  *  Version 0.91        first release to linux-kernel list.
  82  *  Version 0.92        move initial reg dump to separate callable function
  83  *                      change "readahead" to "prefetch" to avoid confusion
  84  *  Version 0.95        respect original BIOS timings unless autotuning.
  85  *                      tons of code cleanup and rearrangement.
  86  *                      added CONFIG_BLK_DEV_CMD640_ENHANCED option
  87  *                      prevent use of unmask when prefetch is on
  88  *  Version 0.96        prevent use of io_32bit when prefetch is off
  89  *  Version 0.97        fix VLB secondary interface for sjd@slip.net
  90  *                      other minor tune-ups:  0.96 was very good.
  91  *  Version 0.98        ignore PCI version when disabled by BIOS
  92  *  Version 0.99        display setup/active/recovery clocks with PIO mode
  93  *  Version 1.00        Mmm.. cannot depend on PCMD_ENA in all systems
  94  *  Version 1.01        slow/fast devsel can be selected with "hdparm -p6/-p7"
  95  *                       ("fast" is necessary for 32bit I/O in some systems)
  96  *  Version 1.02        fix bug that resulted in slow "setup times"
  97  *                       (patch courtesy of Zoltan Hidvegi)
  98  */
  99 
 100 #define CMD640_PREFETCH_MASKS 1
 101 
 102 /*#define CMD640_DUMP_REGS */
 103 
 104 #include <linux/types.h>
 105 #include <linux/kernel.h>
 106 #include <linux/delay.h>
 107 #include <linux/ide.h>
 108 #include <linux/init.h>
 109 #include <linux/module.h>
 110 
 111 #include <asm/io.h>
 112 
 113 #define DRV_NAME "cmd640"
 114 
 115 static bool cmd640_vlb;
 116 
 117 /*
 118  * CMD640 specific registers definition.
 119  */
 120 
 121 #define VID             0x00
 122 #define DID             0x02
 123 #define PCMD            0x04
 124 #define   PCMD_ENA      0x01
 125 #define PSTTS           0x06
 126 #define REVID           0x08
 127 #define PROGIF          0x09
 128 #define SUBCL           0x0a
 129 #define BASCL           0x0b
 130 #define BaseA0          0x10
 131 #define BaseA1          0x14
 132 #define BaseA2          0x18
 133 #define BaseA3          0x1c
 134 #define INTLINE         0x3c
 135 #define INPINE          0x3d
 136 
 137 #define CFR             0x50
 138 #define   CFR_DEVREV            0x03
 139 #define   CFR_IDE01INTR         0x04
 140 #define   CFR_DEVID             0x18
 141 #define   CFR_AT_VESA_078h      0x20
 142 #define   CFR_DSA1              0x40
 143 #define   CFR_DSA0              0x80
 144 
 145 #define CNTRL           0x51
 146 #define   CNTRL_DIS_RA0         0x40
 147 #define   CNTRL_DIS_RA1         0x80
 148 #define   CNTRL_ENA_2ND         0x08
 149 
 150 #define CMDTIM          0x52
 151 #define ARTTIM0         0x53
 152 #define DRWTIM0         0x54
 153 #define ARTTIM1         0x55
 154 #define DRWTIM1         0x56
 155 #define ARTTIM23        0x57
 156 #define   ARTTIM23_DIS_RA2      0x04
 157 #define   ARTTIM23_DIS_RA3      0x08
 158 #define   ARTTIM23_IDE23INTR    0x10
 159 #define DRWTIM23        0x58
 160 #define BRST            0x59
 161 
 162 /*
 163  * Registers and masks for easy access by drive index:
 164  */
 165 static u8 prefetch_regs[4]  = {CNTRL, CNTRL, ARTTIM23, ARTTIM23};
 166 static u8 prefetch_masks[4] = {CNTRL_DIS_RA0, CNTRL_DIS_RA1, ARTTIM23_DIS_RA2, ARTTIM23_DIS_RA3};
 167 
 168 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
 169 
 170 static u8 arttim_regs[4] = {ARTTIM0, ARTTIM1, ARTTIM23, ARTTIM23};
 171 static u8 drwtim_regs[4] = {DRWTIM0, DRWTIM1, DRWTIM23, DRWTIM23};
 172 
 173 /*
 174  * Current cmd640 timing values for each drive.
 175  * The defaults for each are the slowest possible timings.
 176  */
 177 static u8 setup_counts[4]    = {4, 4, 4, 4};     /* Address setup count (in clocks) */
 178 static u8 active_counts[4]   = {16, 16, 16, 16}; /* Active count   (encoded) */
 179 static u8 recovery_counts[4] = {16, 16, 16, 16}; /* Recovery count (encoded) */
 180 
 181 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
 182 
 183 static DEFINE_SPINLOCK(cmd640_lock);
 184 
 185 /*
 186  * Interface to access cmd640x registers
 187  */
 188 static unsigned int cmd640_key;
 189 static void (*__put_cmd640_reg)(u16 reg, u8 val);
 190 static u8 (*__get_cmd640_reg)(u16 reg);
 191 
 192 /*
 193  * This is read from the CFR reg, and is used in several places.
 194  */
 195 static unsigned int cmd640_chip_version;
 196 
 197 /*
 198  * The CMD640x chip does not support DWORD config write cycles, but some
 199  * of the BIOSes use them to implement the config services.
 200  * Therefore, we must use direct IO instead.
 201  */
 202 
 203 /* PCI method 1 access */
 204 
 205 static void put_cmd640_reg_pci1(u16 reg, u8 val)
 206 {
 207         outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
 208         outb_p(val, (reg & 3) | 0xcfc);
 209 }
 210 
 211 static u8 get_cmd640_reg_pci1(u16 reg)
 212 {
 213         outl_p((reg & 0xfc) | cmd640_key, 0xcf8);
 214         return inb_p((reg & 3) | 0xcfc);
 215 }
 216 
 217 /* PCI method 2 access (from CMD datasheet) */
 218 
 219 static void put_cmd640_reg_pci2(u16 reg, u8 val)
 220 {
 221         outb_p(0x10, 0xcf8);
 222         outb_p(val, cmd640_key + reg);
 223         outb_p(0, 0xcf8);
 224 }
 225 
 226 static u8 get_cmd640_reg_pci2(u16 reg)
 227 {
 228         u8 b;
 229 
 230         outb_p(0x10, 0xcf8);
 231         b = inb_p(cmd640_key + reg);
 232         outb_p(0, 0xcf8);
 233         return b;
 234 }
 235 
 236 /* VLB access */
 237 
 238 static void put_cmd640_reg_vlb(u16 reg, u8 val)
 239 {
 240         outb_p(reg, cmd640_key);
 241         outb_p(val, cmd640_key + 4);
 242 }
 243 
 244 static u8 get_cmd640_reg_vlb(u16 reg)
 245 {
 246         outb_p(reg, cmd640_key);
 247         return inb_p(cmd640_key + 4);
 248 }
 249 
 250 static u8 get_cmd640_reg(u16 reg)
 251 {
 252         unsigned long flags;
 253         u8 b;
 254 
 255         spin_lock_irqsave(&cmd640_lock, flags);
 256         b = __get_cmd640_reg(reg);
 257         spin_unlock_irqrestore(&cmd640_lock, flags);
 258         return b;
 259 }
 260 
 261 static void put_cmd640_reg(u16 reg, u8 val)
 262 {
 263         unsigned long flags;
 264 
 265         spin_lock_irqsave(&cmd640_lock, flags);
 266         __put_cmd640_reg(reg, val);
 267         spin_unlock_irqrestore(&cmd640_lock, flags);
 268 }
 269 
 270 static int __init match_pci_cmd640_device(void)
 271 {
 272         const u8 ven_dev[4] = {0x95, 0x10, 0x40, 0x06};
 273         unsigned int i;
 274         for (i = 0; i < 4; i++) {
 275                 if (get_cmd640_reg(i) != ven_dev[i])
 276                         return 0;
 277         }
 278 #ifdef STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT
 279         if ((get_cmd640_reg(PCMD) & PCMD_ENA) == 0) {
 280                 printk("ide: cmd640 on PCI disabled by BIOS\n");
 281                 return 0;
 282         }
 283 #endif /* STUPIDLY_TRUST_BROKEN_PCMD_ENA_BIT */
 284         return 1; /* success */
 285 }
 286 
 287 /*
 288  * Probe for CMD640x -- pci method 1
 289  */
 290 static int __init probe_for_cmd640_pci1(void)
 291 {
 292         __get_cmd640_reg = get_cmd640_reg_pci1;
 293         __put_cmd640_reg = put_cmd640_reg_pci1;
 294         for (cmd640_key = 0x80000000;
 295              cmd640_key <= 0x8000f800;
 296              cmd640_key += 0x800) {
 297                 if (match_pci_cmd640_device())
 298                         return 1; /* success */
 299         }
 300         return 0;
 301 }
 302 
 303 /*
 304  * Probe for CMD640x -- pci method 2
 305  */
 306 static int __init probe_for_cmd640_pci2(void)
 307 {
 308         __get_cmd640_reg = get_cmd640_reg_pci2;
 309         __put_cmd640_reg = put_cmd640_reg_pci2;
 310         for (cmd640_key = 0xc000; cmd640_key <= 0xcf00; cmd640_key += 0x100) {
 311                 if (match_pci_cmd640_device())
 312                         return 1; /* success */
 313         }
 314         return 0;
 315 }
 316 
 317 /*
 318  * Probe for CMD640x -- vlb
 319  */
 320 static int __init probe_for_cmd640_vlb(void)
 321 {
 322         u8 b;
 323 
 324         __get_cmd640_reg = get_cmd640_reg_vlb;
 325         __put_cmd640_reg = put_cmd640_reg_vlb;
 326         cmd640_key = 0x178;
 327         b = get_cmd640_reg(CFR);
 328         if (b == 0xff || b == 0x00 || (b & CFR_AT_VESA_078h)) {
 329                 cmd640_key = 0x78;
 330                 b = get_cmd640_reg(CFR);
 331                 if (b == 0xff || b == 0x00 || !(b & CFR_AT_VESA_078h))
 332                         return 0;
 333         }
 334         return 1; /* success */
 335 }
 336 
 337 /*
 338  *  Returns 1 if an IDE interface/drive exists at 0x170,
 339  *  Returns 0 otherwise.
 340  */
 341 static int __init secondary_port_responding(void)
 342 {
 343         unsigned long flags;
 344 
 345         spin_lock_irqsave(&cmd640_lock, flags);
 346 
 347         outb_p(0x0a, 0x176);    /* select drive0 */
 348         udelay(100);
 349         if ((inb_p(0x176) & 0x1f) != 0x0a) {
 350                 outb_p(0x1a, 0x176); /* select drive1 */
 351                 udelay(100);
 352                 if ((inb_p(0x176) & 0x1f) != 0x1a) {
 353                         spin_unlock_irqrestore(&cmd640_lock, flags);
 354                         return 0; /* nothing responded */
 355                 }
 356         }
 357         spin_unlock_irqrestore(&cmd640_lock, flags);
 358         return 1; /* success */
 359 }
 360 
 361 #ifdef CMD640_DUMP_REGS
 362 /*
 363  * Dump out all cmd640 registers.  May be called from ide.c
 364  */
 365 static void cmd640_dump_regs(void)
 366 {
 367         unsigned int reg = cmd640_vlb ? 0x50 : 0x00;
 368 
 369         /* Dump current state of chip registers */
 370         printk("ide: cmd640 internal register dump:");
 371         for (; reg <= 0x59; reg++) {
 372                 if (!(reg & 0x0f))
 373                         printk("\n%04x:", reg);
 374                 printk(" %02x", get_cmd640_reg(reg));
 375         }
 376         printk("\n");
 377 }
 378 #endif
 379 
 380 static void __set_prefetch_mode(ide_drive_t *drive, int mode)
 381 {
 382         if (mode) {     /* want prefetch on? */
 383 #if CMD640_PREFETCH_MASKS
 384                 drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
 385                 drive->dev_flags &= ~IDE_DFLAG_UNMASK;
 386 #endif
 387                 drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
 388         } else {
 389                 drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK;
 390                 drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
 391                 drive->io_32bit = 0;
 392         }
 393 }
 394 
 395 #ifndef CONFIG_BLK_DEV_CMD640_ENHANCED
 396 /*
 397  * Check whether prefetch is on for a drive,
 398  * and initialize the unmask flags for safe operation.
 399  */
 400 static void __init check_prefetch(ide_drive_t *drive, unsigned int index)
 401 {
 402         u8 b = get_cmd640_reg(prefetch_regs[index]);
 403 
 404         __set_prefetch_mode(drive, (b & prefetch_masks[index]) ? 0 : 1);
 405 }
 406 #else
 407 
 408 /*
 409  * Sets prefetch mode for a drive.
 410  */
 411 static void set_prefetch_mode(ide_drive_t *drive, unsigned int index, int mode)
 412 {
 413         unsigned long flags;
 414         int reg = prefetch_regs[index];
 415         u8 b;
 416 
 417         spin_lock_irqsave(&cmd640_lock, flags);
 418         b = __get_cmd640_reg(reg);
 419         __set_prefetch_mode(drive, mode);
 420         if (mode)
 421                 b &= ~prefetch_masks[index];    /* enable prefetch */
 422         else
 423                 b |= prefetch_masks[index];     /* disable prefetch */
 424         __put_cmd640_reg(reg, b);
 425         spin_unlock_irqrestore(&cmd640_lock, flags);
 426 }
 427 
 428 /*
 429  * Dump out current drive clocks settings
 430  */
 431 static void display_clocks(unsigned int index)
 432 {
 433         u8 active_count, recovery_count;
 434 
 435         active_count = active_counts[index];
 436         if (active_count == 1)
 437                 ++active_count;
 438         recovery_count = recovery_counts[index];
 439         if (active_count > 3 && recovery_count == 1)
 440                 ++recovery_count;
 441         if (cmd640_chip_version > 1)
 442                 recovery_count += 1;  /* cmd640b uses (count + 1)*/
 443         printk(", clocks=%d/%d/%d\n", setup_counts[index], active_count, recovery_count);
 444 }
 445 
 446 /*
 447  * Pack active and recovery counts into single byte representation
 448  * used by controller
 449  */
 450 static inline u8 pack_nibbles(u8 upper, u8 lower)
 451 {
 452         return ((upper & 0x0f) << 4) | (lower & 0x0f);
 453 }
 454 
 455 /*
 456  * This routine writes the prepared setup/active/recovery counts
 457  * for a drive into the cmd640 chipset registers to active them.
 458  */
 459 static void program_drive_counts(ide_drive_t *drive, unsigned int index)
 460 {
 461         unsigned long flags;
 462         u8 setup_count    = setup_counts[index];
 463         u8 active_count   = active_counts[index];
 464         u8 recovery_count = recovery_counts[index];
 465 
 466         /*
 467          * Set up address setup count and drive read/write timing registers.
 468          * Primary interface has individual count/timing registers for
 469          * each drive.  Secondary interface has one common set of registers,
 470          * so we merge the timings, using the slowest value for each timing.
 471          */
 472         if (index > 1) {
 473                 ide_drive_t *peer = ide_get_pair_dev(drive);
 474                 unsigned int mate = index ^ 1;
 475 
 476                 if (peer) {
 477                         if (setup_count < setup_counts[mate])
 478                                 setup_count = setup_counts[mate];
 479                         if (active_count < active_counts[mate])
 480                                 active_count = active_counts[mate];
 481                         if (recovery_count < recovery_counts[mate])
 482                                 recovery_count = recovery_counts[mate];
 483                 }
 484         }
 485 
 486         /*
 487          * Convert setup_count to internal chipset representation
 488          */
 489         switch (setup_count) {
 490         case 4:  setup_count = 0x00; break;
 491         case 3:  setup_count = 0x80; break;
 492         case 1:
 493         case 2:  setup_count = 0x40; break;
 494         default: setup_count = 0xc0; /* case 5 */
 495         }
 496 
 497         /*
 498          * Now that everything is ready, program the new timings
 499          */
 500         spin_lock_irqsave(&cmd640_lock, flags);
 501         /*
 502          * Program the address_setup clocks into ARTTIM reg,
 503          * and then the active/recovery counts into the DRWTIM reg
 504          * (this converts counts of 16 into counts of zero -- okay).
 505          */
 506         setup_count |= __get_cmd640_reg(arttim_regs[index]) & 0x3f;
 507         __put_cmd640_reg(arttim_regs[index], setup_count);
 508         __put_cmd640_reg(drwtim_regs[index], pack_nibbles(active_count, recovery_count));
 509         spin_unlock_irqrestore(&cmd640_lock, flags);
 510 }
 511 
 512 /*
 513  * Set a specific pio_mode for a drive
 514  */
 515 static void cmd640_set_mode(ide_drive_t *drive, unsigned int index,
 516                             u8 pio_mode, unsigned int cycle_time)
 517 {
 518         struct ide_timing *t;
 519         int setup_time, active_time, recovery_time, clock_time;
 520         u8 setup_count, active_count, recovery_count, recovery_count2, cycle_count;
 521         int bus_speed;
 522 
 523         if (cmd640_vlb)
 524                 bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
 525         else
 526                 bus_speed = ide_pci_clk ? ide_pci_clk : 33;
 527 
 528         if (pio_mode > 5)
 529                 pio_mode = 5;
 530 
 531         t = ide_timing_find_mode(XFER_PIO_0 + pio_mode);
 532         setup_time  = t->setup;
 533         active_time = t->active;
 534 
 535         recovery_time = cycle_time - (setup_time + active_time);
 536         clock_time = 1000 / bus_speed;
 537         cycle_count = DIV_ROUND_UP(cycle_time, clock_time);
 538 
 539         setup_count = DIV_ROUND_UP(setup_time, clock_time);
 540 
 541         active_count = DIV_ROUND_UP(active_time, clock_time);
 542         if (active_count < 2)
 543                 active_count = 2; /* minimum allowed by cmd640 */
 544 
 545         recovery_count = DIV_ROUND_UP(recovery_time, clock_time);
 546         recovery_count2 = cycle_count - (setup_count + active_count);
 547         if (recovery_count2 > recovery_count)
 548                 recovery_count = recovery_count2;
 549         if (recovery_count < 2)
 550                 recovery_count = 2; /* minimum allowed by cmd640 */
 551         if (recovery_count > 17) {
 552                 active_count += recovery_count - 17;
 553                 recovery_count = 17;
 554         }
 555         if (active_count > 16)
 556                 active_count = 16; /* maximum allowed by cmd640 */
 557         if (cmd640_chip_version > 1)
 558                 recovery_count -= 1;  /* cmd640b uses (count + 1)*/
 559         if (recovery_count > 16)
 560                 recovery_count = 16; /* maximum allowed by cmd640 */
 561 
 562         setup_counts[index]    = setup_count;
 563         active_counts[index]   = active_count;
 564         recovery_counts[index] = recovery_count;
 565 
 566         /*
 567          * In a perfect world, we might set the drive pio mode here
 568          * (using WIN_SETFEATURE) before continuing.
 569          *
 570          * But we do not, because:
 571          *      1) this is the wrong place to do it (proper is do_special() in ide.c)
 572          *      2) in practice this is rarely, if ever, necessary
 573          */
 574         program_drive_counts(drive, index);
 575 }
 576 
 577 static void cmd640_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 578 {
 579         unsigned int index = 0, cycle_time;
 580         const u8 pio = drive->pio_mode - XFER_PIO_0;
 581         u8 b;
 582 
 583         switch (pio) {
 584         case 6: /* set fast-devsel off */
 585         case 7: /* set fast-devsel on */
 586                 b = get_cmd640_reg(CNTRL) & ~0x27;
 587                 if (pio & 1)
 588                         b |= 0x27;
 589                 put_cmd640_reg(CNTRL, b);
 590                 printk("%s: %sabled cmd640 fast host timing (devsel)\n",
 591                         drive->name, (pio & 1) ? "en" : "dis");
 592                 return;
 593         case 8: /* set prefetch off */
 594         case 9: /* set prefetch on */
 595                 set_prefetch_mode(drive, index, pio & 1);
 596                 printk("%s: %sabled cmd640 prefetch\n",
 597                         drive->name, (pio & 1) ? "en" : "dis");
 598                 return;
 599         }
 600 
 601         cycle_time = ide_pio_cycle_time(drive, pio);
 602         cmd640_set_mode(drive, index, pio, cycle_time);
 603 
 604         printk("%s: selected cmd640 PIO mode%d (%dns)",
 605                 drive->name, pio, cycle_time);
 606 
 607         display_clocks(index);
 608 }
 609 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
 610 
 611 static void __init cmd640_init_dev(ide_drive_t *drive)
 612 {
 613         unsigned int i = drive->hwif->channel * 2 + (drive->dn & 1);
 614 
 615 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
 616         /*
 617          * Reset timing to the slowest speed and turn off prefetch.
 618          * This way, the drive identify code has a better chance.
 619          */
 620         setup_counts[i]    =  4;        /* max possible */
 621         active_counts[i]   = 16;        /* max possible */
 622         recovery_counts[i] = 16;        /* max possible */
 623         program_drive_counts(drive, i);
 624         set_prefetch_mode(drive, i, 0);
 625         printk(KERN_INFO DRV_NAME ": drive%d timings/prefetch cleared\n", i);
 626 #else
 627         /*
 628          * Set the drive unmask flags to match the prefetch setting.
 629          */
 630         check_prefetch(drive, i);
 631         printk(KERN_INFO DRV_NAME ": drive%d timings/prefetch(%s) preserved\n",
 632                 i, (drive->dev_flags & IDE_DFLAG_NO_IO_32BIT) ? "off" : "on");
 633 #endif /* CONFIG_BLK_DEV_CMD640_ENHANCED */
 634 }
 635 
 636 static int cmd640_test_irq(ide_hwif_t *hwif)
 637 {
 638         int irq_reg             = hwif->channel ? ARTTIM23 : CFR;
 639         u8  irq_mask            = hwif->channel ? ARTTIM23_IDE23INTR :
 640                                                   CFR_IDE01INTR;
 641         u8  irq_stat            = get_cmd640_reg(irq_reg);
 642 
 643         return (irq_stat & irq_mask) ? 1 : 0;
 644 }
 645 
 646 static const struct ide_port_ops cmd640_port_ops = {
 647         .init_dev               = cmd640_init_dev,
 648 #ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
 649         .set_pio_mode           = cmd640_set_pio_mode,
 650 #endif
 651         .test_irq               = cmd640_test_irq,
 652 };
 653 
 654 static int pci_conf1(void)
 655 {
 656         unsigned long flags;
 657         u32 tmp;
 658 
 659         spin_lock_irqsave(&cmd640_lock, flags);
 660         outb(0x01, 0xCFB);
 661         tmp = inl(0xCF8);
 662         outl(0x80000000, 0xCF8);
 663         if (inl(0xCF8) == 0x80000000) {
 664                 outl(tmp, 0xCF8);
 665                 spin_unlock_irqrestore(&cmd640_lock, flags);
 666                 return 1;
 667         }
 668         outl(tmp, 0xCF8);
 669         spin_unlock_irqrestore(&cmd640_lock, flags);
 670         return 0;
 671 }
 672 
 673 static int pci_conf2(void)
 674 {
 675         unsigned long flags;
 676 
 677         spin_lock_irqsave(&cmd640_lock, flags);
 678         outb(0x00, 0xCFB);
 679         outb(0x00, 0xCF8);
 680         outb(0x00, 0xCFA);
 681         if (inb(0xCF8) == 0x00 && inb(0xCF8) == 0x00) {
 682                 spin_unlock_irqrestore(&cmd640_lock, flags);
 683                 return 1;
 684         }
 685         spin_unlock_irqrestore(&cmd640_lock, flags);
 686         return 0;
 687 }
 688 
 689 static const struct ide_port_info cmd640_port_info __initconst = {
 690         .chipset                = ide_cmd640,
 691         .host_flags             = IDE_HFLAG_SERIALIZE |
 692                                   IDE_HFLAG_NO_DMA |
 693                                   IDE_HFLAG_ABUSE_PREFETCH |
 694                                   IDE_HFLAG_ABUSE_FAST_DEVSEL,
 695         .port_ops               = &cmd640_port_ops,
 696         .pio_mask               = ATA_PIO5,
 697 };
 698 
 699 static int __init cmd640x_init_one(unsigned long base, unsigned long ctl)
 700 {
 701         if (!request_region(base, 8, DRV_NAME)) {
 702                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
 703                                 DRV_NAME, base, base + 7);
 704                 return -EBUSY;
 705         }
 706 
 707         if (!request_region(ctl, 1, DRV_NAME)) {
 708                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
 709                                 DRV_NAME, ctl);
 710                 release_region(base, 8);
 711                 return -EBUSY;
 712         }
 713 
 714         return 0;
 715 }
 716 
 717 /*
 718  * Probe for a cmd640 chipset, and initialize it if found.
 719  */
 720 static int __init cmd640x_init(void)
 721 {
 722         int second_port_cmd640 = 0, rc;
 723         const char *bus_type, *port2;
 724         u8 b, cfr;
 725         struct ide_hw hw[2], *hws[2];
 726 
 727         if (cmd640_vlb && probe_for_cmd640_vlb()) {
 728                 bus_type = "VLB";
 729         } else {
 730                 cmd640_vlb = 0;
 731                 /* Find out what kind of PCI probing is supported otherwise
 732                    Justin Gibbs will sulk.. */
 733                 if (pci_conf1() && probe_for_cmd640_pci1())
 734                         bus_type = "PCI (type1)";
 735                 else if (pci_conf2() && probe_for_cmd640_pci2())
 736                         bus_type = "PCI (type2)";
 737                 else
 738                         return 0;
 739         }
 740         /*
 741          * Undocumented magic (there is no 0x5b reg in specs)
 742          */
 743         put_cmd640_reg(0x5b, 0xbd);
 744         if (get_cmd640_reg(0x5b) != 0xbd) {
 745                 printk(KERN_ERR "ide: cmd640 init failed: wrong value in reg 0x5b\n");
 746                 return 0;
 747         }
 748         put_cmd640_reg(0x5b, 0);
 749 
 750 #ifdef CMD640_DUMP_REGS
 751         cmd640_dump_regs();
 752 #endif
 753 
 754         /*
 755          * Documented magic begins here
 756          */
 757         cfr = get_cmd640_reg(CFR);
 758         cmd640_chip_version = cfr & CFR_DEVREV;
 759         if (cmd640_chip_version == 0) {
 760                 printk("ide: bad cmd640 revision: %d\n", cmd640_chip_version);
 761                 return 0;
 762         }
 763 
 764         rc = cmd640x_init_one(0x1f0, 0x3f6);
 765         if (rc)
 766                 return rc;
 767 
 768         rc = cmd640x_init_one(0x170, 0x376);
 769         if (rc) {
 770                 release_region(0x3f6, 1);
 771                 release_region(0x1f0, 8);
 772                 return rc;
 773         }
 774 
 775         memset(&hw, 0, sizeof(hw));
 776 
 777         ide_std_init_ports(&hw[0], 0x1f0, 0x3f6);
 778         hw[0].irq = 14;
 779 
 780         ide_std_init_ports(&hw[1], 0x170, 0x376);
 781         hw[1].irq = 15;
 782 
 783         printk(KERN_INFO "cmd640: buggy cmd640%c interface on %s, config=0x%02x"
 784                          "\n", 'a' + cmd640_chip_version - 1, bus_type, cfr);
 785 
 786         /*
 787          * Initialize data for primary port
 788          */
 789         hws[0] = &hw[0];
 790 
 791         /*
 792          * Ensure compatibility by always using the slowest timings
 793          * for access to the drive's command register block,
 794          * and reset the prefetch burstsize to default (512 bytes).
 795          *
 796          * Maybe we need a way to NOT do these on *some* systems?
 797          */
 798         put_cmd640_reg(CMDTIM, 0);
 799         put_cmd640_reg(BRST, 0x40);
 800 
 801         b = get_cmd640_reg(CNTRL);
 802 
 803         /*
 804          * Try to enable the secondary interface, if not already enabled
 805          */
 806         if (secondary_port_responding()) {
 807                 if ((b & CNTRL_ENA_2ND)) {
 808                         second_port_cmd640 = 1;
 809                         port2 = "okay";
 810                 } else if (cmd640_vlb) {
 811                         second_port_cmd640 = 1;
 812                         port2 = "alive";
 813                 } else
 814                         port2 = "not cmd640";
 815         } else {
 816                 put_cmd640_reg(CNTRL, b ^ CNTRL_ENA_2ND); /* toggle the bit */
 817                 if (secondary_port_responding()) {
 818                         second_port_cmd640 = 1;
 819                         port2 = "enabled";
 820                 } else {
 821                         put_cmd640_reg(CNTRL, b); /* restore original setting */
 822                         port2 = "not responding";
 823                 }
 824         }
 825 
 826         /*
 827          * Initialize data for secondary cmd640 port, if enabled
 828          */
 829         if (second_port_cmd640)
 830                 hws[1] = &hw[1];
 831 
 832         printk(KERN_INFO "cmd640: %sserialized, secondary interface %s\n",
 833                          second_port_cmd640 ? "" : "not ", port2);
 834 
 835 #ifdef CMD640_DUMP_REGS
 836         cmd640_dump_regs();
 837 #endif
 838 
 839         return ide_host_add(&cmd640_port_info, hws, second_port_cmd640 ? 2 : 1,
 840                             NULL);
 841 }
 842 
 843 module_param_named(probe_vlb, cmd640_vlb, bool, 0);
 844 MODULE_PARM_DESC(probe_vlb, "probe for VLB version of CMD640 chipset");
 845 
 846 module_init(cmd640x_init);
 847 
 848 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/ide/cmd640.c

DEFINITIONS
