root/drivers/scsi/arm/arxescsi.c

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DEFINITIONS

This source file includes following definitions.
  1. arxescsi_dma_setup
  2. arxescsi_pseudo_dma_write
  3. arxescsi_dma_pseudo
  4. arxescsi_dma_stop
  5. arxescsi_info
  6. arxescsi_show_info
  7. arxescsi_probe
  8. arxescsi_remove
  9. init_arxe_scsi_driver
  10. exit_arxe_scsi_driver

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/drivers/scsi/arm/arxescsi.c
   4  *
   5  * Copyright (C) 1997-2000 Russell King, Stefan Hanske
   6  *
   7  * This driver is based on experimentation.  Hence, it may have made
   8  * assumptions about the particular card that I have available, and
   9  * may not be reliable!
  10  *
  11  * Changelog:
  12  *  30-08-1997  RMK     0.0.0   Created, READONLY version as cumana_2.c
  13  *  22-01-1998  RMK     0.0.1   Updated to 2.1.80
  14  *  15-04-1998  RMK     0.0.1   Only do PIO if FAS216 will allow it.
  15  *  11-06-1998  SH      0.0.2   Changed to support ARXE 16-bit SCSI card
  16  *                              enabled writing
  17  *  01-01-2000  SH      0.1.0   Added *real* pseudo dma writing
  18  *                              (arxescsi_pseudo_dma_write)
  19  *  02-04-2000  RMK     0.1.1   Updated for new error handling code.
  20  *  22-10-2000  SH              Updated for new registering scheme.
  21  */
  22 #include <linux/module.h>
  23 #include <linux/blkdev.h>
  24 #include <linux/kernel.h>
  25 #include <linux/string.h>
  26 #include <linux/ioport.h>
  27 #include <linux/proc_fs.h>
  28 #include <linux/unistd.h>
  29 #include <linux/stat.h>
  30 #include <linux/delay.h>
  31 #include <linux/init.h>
  32 #include <linux/interrupt.h>
  33 
  34 #include <asm/dma.h>
  35 #include <asm/io.h>
  36 #include <asm/ecard.h>
  37 
  38 #include "../scsi.h"
  39 #include <scsi/scsi_host.h>
  40 #include "fas216.h"
  41 
  42 struct arxescsi_info {
  43         FAS216_Info             info;
  44         struct expansion_card   *ec;
  45         void __iomem            *base;
  46 };
  47 
  48 #define DMADATA_OFFSET  (0x200)
  49 
  50 #define DMASTAT_OFFSET  (0x600)
  51 #define DMASTAT_DRQ     (1 << 0)
  52 
  53 #define CSTATUS_IRQ     (1 << 0)
  54 
  55 #define VERSION "1.10 (23/01/2003 2.5.57)"
  56 
  57 /*
  58  * Function: int arxescsi_dma_setup(host, SCpnt, direction, min_type)
  59  * Purpose : initialises DMA/PIO
  60  * Params  : host      - host
  61  *           SCpnt     - command
  62  *           direction - DMA on to/off of card
  63  *           min_type  - minimum DMA support that we must have for this transfer
  64  * Returns : 0 if we should not set CMD_WITHDMA for transfer info command
  65  */
  66 static fasdmatype_t
  67 arxescsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
  68                        fasdmadir_t direction, fasdmatype_t min_type)
  69 {
  70         /*
  71          * We don't do real DMA
  72          */
  73         return fasdma_pseudo;
  74 }
  75 
  76 static void arxescsi_pseudo_dma_write(unsigned char *addr, void __iomem *base)
  77 {
  78        __asm__ __volatile__(
  79        "               stmdb   sp!, {r0-r12}\n"
  80        "               mov     r3, %0\n"
  81        "               mov     r1, %1\n"
  82        "               add     r2, r1, #512\n"
  83        "               mov     r4, #256\n"
  84        ".loop_1:       ldmia   r3!, {r6, r8, r10, r12}\n"
  85        "               mov     r5, r6, lsl #16\n"
  86        "               mov     r7, r8, lsl #16\n"
  87        ".loop_2:       ldrb    r0, [r1, #1536]\n"
  88        "               tst     r0, #1\n"
  89        "               beq     .loop_2\n"
  90        "               stmia   r2, {r5-r8}\n\t"
  91        "               mov     r9, r10, lsl #16\n"
  92        "               mov     r11, r12, lsl #16\n"
  93        ".loop_3:       ldrb    r0, [r1, #1536]\n"
  94        "               tst     r0, #1\n"
  95        "               beq     .loop_3\n"
  96        "               stmia   r2, {r9-r12}\n"
  97        "               subs    r4, r4, #16\n"
  98        "               bne     .loop_1\n"
  99        "               ldmia   sp!, {r0-r12}\n"
 100        :
 101        : "r" (addr), "r" (base));
 102 }
 103 
 104 /*
 105  * Function: int arxescsi_dma_pseudo(host, SCpnt, direction, transfer)
 106  * Purpose : handles pseudo DMA
 107  * Params  : host      - host
 108  *           SCpnt     - command
 109  *           direction - DMA on to/off of card
 110  *           transfer  - minimum number of bytes we expect to transfer
 111  */
 112 static void
 113 arxescsi_dma_pseudo(struct Scsi_Host *host, struct scsi_pointer *SCp,
 114                     fasdmadir_t direction, int transfer)
 115 {
 116         struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
 117         unsigned int length, error = 0;
 118         void __iomem *base = info->info.scsi.io_base;
 119         unsigned char *addr;
 120 
 121         length = SCp->this_residual;
 122         addr = SCp->ptr;
 123 
 124         if (direction == DMA_OUT) {
 125                 unsigned int word;
 126                 while (length > 256) {
 127                         if (readb(base + 0x80) & STAT_INT) {
 128                                 error = 1;
 129                                 break;
 130                         }
 131                         arxescsi_pseudo_dma_write(addr, base);
 132                         addr += 256;
 133                         length -= 256;
 134                 }
 135 
 136                 if (!error)
 137                         while (length > 0) {
 138                                 if (readb(base + 0x80) & STAT_INT)
 139                                         break;
 140          
 141                                 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
 142                                         continue;
 143 
 144                                 word = *addr | *(addr + 1) << 8;
 145 
 146                                 writew(word, base + DMADATA_OFFSET);
 147                                 if (length > 1) {
 148                                         addr += 2;
 149                                         length -= 2;
 150                                 } else {
 151                                         addr += 1;
 152                                         length -= 1;
 153                                 }
 154                         }
 155         }
 156         else {
 157                 if (transfer && (transfer & 255)) {
 158                         while (length >= 256) {
 159                                 if (readb(base + 0x80) & STAT_INT) {
 160                                         error = 1;
 161                                         break;
 162                                 }
 163             
 164                                 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
 165                                         continue;
 166 
 167                                 readsw(base + DMADATA_OFFSET, addr, 256 >> 1);
 168                                 addr += 256;
 169                                 length -= 256;
 170                         }
 171                 }
 172 
 173                 if (!(error))
 174                         while (length > 0) {
 175                                 unsigned long word;
 176 
 177                                 if (readb(base + 0x80) & STAT_INT)
 178                                         break;
 179 
 180                                 if (!(readb(base + DMASTAT_OFFSET) & DMASTAT_DRQ))
 181                                         continue;
 182 
 183                                 word = readw(base + DMADATA_OFFSET);
 184                                 *addr++ = word;
 185                                 if (--length > 0) {
 186                                         *addr++ = word >> 8;
 187                                         length --;
 188                                 }
 189                         }
 190         }
 191 }
 192 
 193 /*
 194  * Function: int arxescsi_dma_stop(host, SCpnt)
 195  * Purpose : stops DMA/PIO
 196  * Params  : host  - host
 197  *           SCpnt - command
 198  */
 199 static void arxescsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
 200 {
 201         /*
 202          * no DMA to stop
 203          */
 204 }
 205 
 206 /*
 207  * Function: const char *arxescsi_info(struct Scsi_Host * host)
 208  * Purpose : returns a descriptive string about this interface,
 209  * Params  : host - driver host structure to return info for.
 210  * Returns : pointer to a static buffer containing null terminated string.
 211  */
 212 static const char *arxescsi_info(struct Scsi_Host *host)
 213 {
 214         struct arxescsi_info *info = (struct arxescsi_info *)host->hostdata;
 215         static char string[150];
 216 
 217         sprintf(string, "%s (%s) in slot %d v%s",
 218                 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
 219                 VERSION);
 220 
 221         return string;
 222 }
 223 
 224 static int
 225 arxescsi_show_info(struct seq_file *m, struct Scsi_Host *host)
 226 {
 227         struct arxescsi_info *info;
 228         info = (struct arxescsi_info *)host->hostdata;
 229 
 230         seq_printf(m, "ARXE 16-bit SCSI driver v%s\n", VERSION);
 231         fas216_print_host(&info->info, m);
 232         fas216_print_stats(&info->info, m);
 233         fas216_print_devices(&info->info, m);
 234         return 0;
 235 }
 236 
 237 static struct scsi_host_template arxescsi_template = {
 238         .show_info                      = arxescsi_show_info,
 239         .name                           = "ARXE SCSI card",
 240         .info                           = arxescsi_info,
 241         .queuecommand                   = fas216_noqueue_command,
 242         .eh_host_reset_handler          = fas216_eh_host_reset,
 243         .eh_bus_reset_handler           = fas216_eh_bus_reset,
 244         .eh_device_reset_handler        = fas216_eh_device_reset,
 245         .eh_abort_handler               = fas216_eh_abort,
 246         .can_queue                      = 0,
 247         .this_id                        = 7,
 248         .sg_tablesize                   = SG_ALL,
 249         .dma_boundary                   = PAGE_SIZE - 1,
 250         .proc_name                      = "arxescsi",
 251 };
 252 
 253 static int arxescsi_probe(struct expansion_card *ec, const struct ecard_id *id)
 254 {
 255         struct Scsi_Host *host;
 256         struct arxescsi_info *info;
 257         void __iomem *base;
 258         int ret;
 259 
 260         ret = ecard_request_resources(ec);
 261         if (ret)
 262                 goto out;
 263 
 264         base = ecardm_iomap(ec, ECARD_RES_MEMC, 0, 0);
 265         if (!base) {
 266                 ret = -ENOMEM;
 267                 goto out_region;
 268         }
 269 
 270         host = scsi_host_alloc(&arxescsi_template, sizeof(struct arxescsi_info));
 271         if (!host) {
 272                 ret = -ENOMEM;
 273                 goto out_region;
 274         }
 275 
 276         info = (struct arxescsi_info *)host->hostdata;
 277         info->ec = ec;
 278         info->base = base;
 279 
 280         info->info.scsi.io_base         = base + 0x2000;
 281         info->info.scsi.irq             = 0;
 282         info->info.scsi.dma             = NO_DMA;
 283         info->info.scsi.io_shift        = 5;
 284         info->info.ifcfg.clockrate      = 24; /* MHz */
 285         info->info.ifcfg.select_timeout = 255;
 286         info->info.ifcfg.asyncperiod    = 200; /* ns */
 287         info->info.ifcfg.sync_max_depth = 0;
 288         info->info.ifcfg.cntl3          = CNTL3_FASTSCSI | CNTL3_FASTCLK;
 289         info->info.ifcfg.disconnect_ok  = 0;
 290         info->info.ifcfg.wide_max_size  = 0;
 291         info->info.ifcfg.capabilities   = FASCAP_PSEUDODMA;
 292         info->info.dma.setup            = arxescsi_dma_setup;
 293         info->info.dma.pseudo           = arxescsi_dma_pseudo;
 294         info->info.dma.stop             = arxescsi_dma_stop;
 295                 
 296         ec->irqaddr = base;
 297         ec->irqmask = CSTATUS_IRQ;
 298 
 299         ret = fas216_init(host);
 300         if (ret)
 301                 goto out_unregister;
 302 
 303         ret = fas216_add(host, &ec->dev);
 304         if (ret == 0)
 305                 goto out;
 306 
 307         fas216_release(host);
 308  out_unregister:
 309         scsi_host_put(host);
 310  out_region:
 311         ecard_release_resources(ec);
 312  out:
 313         return ret;
 314 }
 315 
 316 static void arxescsi_remove(struct expansion_card *ec)
 317 {
 318         struct Scsi_Host *host = ecard_get_drvdata(ec);
 319 
 320         ecard_set_drvdata(ec, NULL);
 321         fas216_remove(host);
 322 
 323         fas216_release(host);
 324         scsi_host_put(host);
 325         ecard_release_resources(ec);
 326 }
 327 
 328 static const struct ecard_id arxescsi_cids[] = {
 329         { MANU_ARXE, PROD_ARXE_SCSI },
 330         { 0xffff, 0xffff },
 331 };
 332 
 333 static struct ecard_driver arxescsi_driver = {
 334         .probe          = arxescsi_probe,
 335         .remove         = arxescsi_remove,
 336         .id_table       = arxescsi_cids,
 337         .drv = {
 338                 .name           = "arxescsi",
 339         },
 340 };
 341 
 342 static int __init init_arxe_scsi_driver(void)
 343 {
 344         return ecard_register_driver(&arxescsi_driver);
 345 }
 346 
 347 static void __exit exit_arxe_scsi_driver(void)
 348 {
 349         ecard_remove_driver(&arxescsi_driver);
 350 }
 351 
 352 module_init(init_arxe_scsi_driver);
 353 module_exit(exit_arxe_scsi_driver);
 354 
 355 MODULE_AUTHOR("Stefan Hanske");
 356 MODULE_DESCRIPTION("ARXESCSI driver for Acorn machines");
 357 MODULE_LICENSE("GPL");
 358 

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