drivers/scsi/ide-scsi.c

   1 /*
   2  * linux/drivers/scsi/ide-scsi.c        Version 0.9             Jul   4, 1999
   3  *
   4  * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
   5  */
   6
   7 /*
   8  * Emulation of a SCSI host adapter for IDE ATAPI devices.
   9  *
  10  * With this driver, one can use the Linux SCSI drivers instead of the
  11  * native IDE ATAPI drivers.
  12  *
  13  * Ver 0.1   Dec  3 96   Initial version.
  14  * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
  15  *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
  16  *                        to Janos Farkas for pointing this out.
  17  *                       Avoid using bitfields in structures for m68k.
  18  *                       Added Scatter/Gather and DMA support.
  19  * Ver 0.4   Dec  7 97   Add support for ATAPI PD/CD drives.
  20  *                       Use variable timeout for each command.
  21  * Ver 0.5   Jan  2 98   Fix previous PD/CD support.
  22  *                       Allow disabling of SCSI-6 to SCSI-10 transformation.
  23  * Ver 0.6   Jan 27 98   Allow disabling of SCSI command translation layer
  24  *                        for access through /dev/sg.
  25  *                       Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
  26  * Ver 0.7   Dec 04 98   Ignore commands where lun != 0 to avoid multiple
  27  *                        detection of devices with CONFIG_SCSI_MULTI_LUN
  28  * Ver 0.8   Feb 05 99   Optical media need translation too. Reverse 0.7.
  29  * Ver 0.9   Jul 04 99   Fix a bug in SG_SET_TRANSFORM.
  30  * Ver 0.91  Jun 10 02   Fix "off by one" error in transforms
  31  * Ver 0.92  Dec 31 02   Implement new SCSI mid level API
  32  */
  33
  34 #define IDESCSI_VERSION "0.92"
  35
  36 #include <linux/module.h>
  37 #include <linux/config.h>
  38 #include <linux/types.h>
  39 #include <linux/string.h>
  40 #include <linux/kernel.h>
  41 #include <linux/mm.h>
  42 #include <linux/ioport.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/errno.h>
  45 #include <linux/hdreg.h>
  46 #include <linux/slab.h>
  47 #include <linux/ide.h>
  48 #include <linux/scatterlist.h>
  49
  50 #include <asm/io.h>
  51 #include <asm/bitops.h>
  52 #include <asm/uaccess.h>
  53
  54 #include <scsi/scsi.h>
  55 #include <scsi/scsi_cmnd.h>
  56 #include <scsi/scsi_device.h>
  57 #include <scsi/scsi_host.h>
  58 #include <scsi/scsi_tcq.h>
  59 #include <scsi/sg.h>
  60
  61 #define IDESCSI_DEBUG_LOG               0
  62
  63 typedef struct idescsi_pc_s {
  64         u8 c[12];                               /* Actual packet bytes */
  65         int request_transfer;                   /* Bytes to transfer */
  66         int actually_transferred;               /* Bytes actually transferred */
  67         int buffer_size;                        /* Size of our data buffer */
  68         struct request *rq;                     /* The corresponding request */
  69         u8 *buffer;                             /* Data buffer */
  70         u8 *current_position;                   /* Pointer into the above buffer */
  71         struct scatterlist *sg;                 /* Scatter gather table */
  72         int b_count;                            /* Bytes transferred from current entry */
  73         struct scsi_cmnd *scsi_cmd;             /* SCSI command */
  74         void (*done)(struct scsi_cmnd *);       /* Scsi completion routine */
  75         unsigned long flags;                    /* Status/Action flags */
  76         unsigned long timeout;                  /* Command timeout */
  77 } idescsi_pc_t;
  78
  79 /*
  80  *      Packet command status bits.
  81  */
  82 #define PC_DMA_IN_PROGRESS              0       /* 1 while DMA in progress */
  83 #define PC_WRITING                      1       /* Data direction */
  84 #define PC_TRANSFORM                    2       /* transform SCSI commands */
  85 #define PC_TIMEDOUT                     3       /* command timed out */
  86 #define PC_DMA_OK                       4       /* Use DMA */
  87
  88 /*
  89  *      SCSI command transformation layer
  90  */
  91 #define IDESCSI_TRANSFORM               0       /* Enable/Disable transformation */
  92 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
  93
  94 /*
  95  *      Log flags
  96  */
  97 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
  98
  99 typedef struct {
 100         ide_drive_t *drive;
 101         idescsi_pc_t *pc;                       /* Current packet command */
 102         unsigned long flags;                    /* Status/Action flags */
 103         unsigned long transform;                /* SCSI cmd translation layer */
 104         unsigned long log;                      /* log flags */
 105 } idescsi_scsi_t;
 106
 107 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 108 {
 109         return (idescsi_scsi_t*) (&host[1]);
 110 }
 111
 112 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 113 {
 114         return scsihost_to_idescsi(ide_drive->driver_data);
 115 }
 116
 117 /*
 118  *      Per ATAPI device status bits.
 119  */
 120 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
 121
 122 /*
 123  *      ide-scsi requests.
 124  */
 125 #define IDESCSI_PC_RQ                   90
 126
 127 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
 128 {
 129         while (bcount--)
 130                 (void) HWIF(drive)->INB(IDE_DATA_REG);
 131 }
 132
 133 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
 134 {
 135         while (bcount--)
 136                 HWIF(drive)->OUTB(0, IDE_DATA_REG);
 137 }
 138
 139 /*
 140  *      PIO data transfer routines using the scatter gather table.
 141  */
 142 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 143 {
 144         int count;
 145         char *buf;
 146
 147         while (bcount) {
 148                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 149                         printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
 150                         idescsi_discard_data (drive, bcount);
 151                         return;
 152                 }
 153                 count = min(pc->sg->length - pc->b_count, bcount);
 154                 buf = page_address(pc->sg->page) + pc->sg->offset;
 155                 drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count);
 156                 bcount -= count; pc->b_count += count;
 157                 if (pc->b_count == pc->sg->length) {
 158                         pc->sg++;
 159                         pc->b_count = 0;
 160                 }
 161         }
 162 }
 163
 164 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 165 {
 166         int count;
 167         char *buf;
 168
 169         while (bcount) {
 170                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 171                         printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
 172                         idescsi_output_zeros (drive, bcount);
 173                         return;
 174                 }
 175                 count = min(pc->sg->length - pc->b_count, bcount);
 176                 buf = page_address(pc->sg->page) + pc->sg->offset;
 177                 drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count);
 178                 bcount -= count; pc->b_count += count;
 179                 if (pc->b_count == pc->sg->length) {
 180                         pc->sg++;
 181                         pc->b_count = 0;
 182                 }
 183         }
 184 }
 185
 186 /*
 187  *      Most of the SCSI commands are supported directly by ATAPI devices.
 188  *      idescsi_transform_pc handles the few exceptions.
 189  */
 190 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
 191 {
 192         u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
 193         char *atapi_buf;
 194
 195         if (!test_bit(PC_TRANSFORM, &pc->flags))
 196                 return;
 197         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 198                 if (c[0] == READ_6 || c[0] == WRITE_6) {
 199                         c[8] = c[4];            c[5] = c[3];            c[4] = c[2];
 200                         c[3] = c[1] & 0x1f;     c[2] = 0;               c[1] &= 0xe0;
 201                         c[0] += (READ_10 - READ_6);
 202                 }
 203                 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
 204                         unsigned short new_len;
 205                         if (!scsi_buf)
 206                                 return;
 207                         if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
 208                                 return;
 209                         memset(atapi_buf, 0, pc->buffer_size + 4);
 210                         memset (c, 0, 12);
 211                         c[0] = sc[0] | 0x40;
 212                         c[1] = sc[1];
 213                         c[2] = sc[2];
 214                         new_len = sc[4] + 4;
 215                         c[8] = new_len;
 216                         c[7] = new_len >> 8;
 217                         c[9] = sc[5];
 218                         if (c[0] == MODE_SELECT_10) {
 219                                 atapi_buf[1] = scsi_buf[0];     /* Mode data length */
 220                                 atapi_buf[2] = scsi_buf[1];     /* Medium type */
 221                                 atapi_buf[3] = scsi_buf[2];     /* Device specific parameter */
 222                                 atapi_buf[7] = scsi_buf[3];     /* Block descriptor length */
 223                                 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
 224                         }
 225                         pc->buffer = atapi_buf;
 226                         pc->request_transfer += 4;
 227                         pc->buffer_size += 4;
 228                 }
 229         }
 230 }
 231
 232 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
 233 {
 234         u8 *atapi_buf = pc->buffer;
 235         u8 *sc = pc->scsi_cmd->cmnd;
 236         u8 *scsi_buf = pc->scsi_cmd->request_buffer;
 237
 238         if (!test_bit(PC_TRANSFORM, &pc->flags))
 239                 return;
 240         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 241                 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
 242                         scsi_buf[0] = atapi_buf[1];             /* Mode data length */
 243                         scsi_buf[1] = atapi_buf[2];             /* Medium type */
 244                         scsi_buf[2] = atapi_buf[3];             /* Device specific parameter */
 245                         scsi_buf[3] = atapi_buf[7];             /* Block descriptor length */
 246                         memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
 247                 }
 248                 if (pc->c[0] == INQUIRY) {
 249                         scsi_buf[2] |= 2;                       /* ansi_revision */
 250                         scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
 251                 }
 252         }
 253         if (atapi_buf && atapi_buf != scsi_buf)
 254                 kfree(atapi_buf);
 255 }
 256
 257 static void hexdump(u8 *x, int len)
 258 {
 259         int i;
 260
 261         printk("[ ");
 262         for (i = 0; i < len; i++)
 263                 printk("%x ", x[i]);
 264         printk("]\n");
 265 }
 266
 267 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
 268 {
 269         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 270         idescsi_pc_t   *pc;
 271         struct request *rq;
 272         u8             *buf;
 273
 274         /* stuff a sense request in front of our current request */
 275         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 276         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 277         buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 278         if (pc == NULL || rq == NULL || buf == NULL) {
 279                 if (pc) kfree(pc);
 280                 if (rq) kfree(rq);
 281                 if (buf) kfree(buf);
 282                 return -ENOMEM;
 283         }
 284         memset (pc, 0, sizeof (idescsi_pc_t));
 285         memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
 286         ide_init_drive_cmd(rq);
 287         rq->special = (char *) pc;
 288         pc->rq = rq;
 289         pc->buffer = buf;
 290         pc->c[0] = REQUEST_SENSE;
 291         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
 292         rq->flags = REQ_SENSE;
 293         pc->timeout = jiffies + WAIT_READY;
 294         /* NOTE! Save the failed packet command in "rq->buffer" */
 295         rq->buffer = (void *) failed_command->special;
 296         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
 297         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 298                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 299                 hexdump(pc->c, 6);
 300         }
 301         return ide_do_drive_cmd(drive, rq, ide_preempt);
 302 }
 303
 304 static ide_startstop_t
 305 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 306 {
 307         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
 308                 /* force an abort */
 309                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
 310
 311         rq->errors++;
 312         DRIVER(drive)->end_request(drive, 0, 0);
 313         return ide_stopped;
 314 }
 315
 316 static ide_startstop_t
 317 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 318 {
 319 #if IDESCSI_DEBUG_LOG
 320         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
 321                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
 322 #endif
 323         rq->errors |= ERROR_MAX;
 324         DRIVER(drive)->end_request(drive, 0, 0);
 325         return ide_stopped;
 326 }
 327
 328 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 329 {
 330         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 331         struct request *rq = HWGROUP(drive)->rq;
 332         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
 333         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 334         struct Scsi_Host *host;
 335         u8 *scsi_buf;
 336         unsigned long flags;
 337
 338         if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
 339                 ide_end_request(drive, uptodate, nrsecs);
 340                 return 0;
 341         }
 342         ide_end_drive_cmd (drive, 0, 0);
 343         if (rq->flags & REQ_SENSE) {
 344                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
 345                 if (log) {
 346                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 347                         hexdump(pc->buffer,16);
 348                 }
 349                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
 350                 kfree(pc->buffer);
 351                 kfree(pc);
 352                 kfree(rq);
 353                 pc = opc;
 354                 rq = pc->rq;
 355                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 356                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
 357         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
 358                 if (log)
 359                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 360                                         drive->name, pc->scsi_cmd->serial_number);
 361                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 362         } else if (rq->errors >= ERROR_MAX) {
 363                 pc->scsi_cmd->result = DID_ERROR << 16;
 364                 if (log)
 365                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 366         } else if (rq->errors) {
 367                 if (log)
 368                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 369                 if (!idescsi_check_condition(drive, rq))
 370                         /* we started a request sense, so we'll be back, exit for now */
 371                         return 0;
 372                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 373         } else {
 374                 pc->scsi_cmd->result = DID_OK << 16;
 375                 idescsi_transform_pc2 (drive, pc);
 376                 if (log) {
 377                         printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
 378                         if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
 379                                 printk(", rst = ");
 380                                 scsi_buf = pc->scsi_cmd->request_buffer;
 381                                 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
 382                         } else printk("\n");
 383                 }
 384         }
 385         host = pc->scsi_cmd->device->host;
 386         spin_lock_irqsave(host->host_lock, flags);
 387         pc->done(pc->scsi_cmd);
 388         spin_unlock_irqrestore(host->host_lock, flags);
 389         kfree(pc);
 390         kfree(rq);
 391         scsi->pc = NULL;
 392         return 0;
 393 }
 394
 395 static inline unsigned long get_timeout(idescsi_pc_t *pc)
 396 {
 397         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 398 }
 399
 400 static int idescsi_expiry(ide_drive_t *drive)
 401 {
 402         idescsi_scsi_t *scsi = drive->driver_data;
 403         idescsi_pc_t   *pc   = scsi->pc;
 404
 405 #if IDESCSI_DEBUG_LOG
 406         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
 407 #endif
 408         set_bit(PC_TIMEDOUT, &pc->flags);
 409
 410         return 0;                                       /* we do not want the ide subsystem to retry */
 411 }
 412
 413 /*
 414  *      Our interrupt handler.
 415  */
 416 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 417 {
 418         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 419         idescsi_pc_t *pc=scsi->pc;
 420         struct request *rq = pc->rq;
 421         atapi_bcount_t bcount;
 422         atapi_status_t status;
 423         atapi_ireason_t ireason;
 424         atapi_feature_t feature;
 425
 426         unsigned int temp;
 427
 428 #if IDESCSI_DEBUG_LOG
 429         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
 430 #endif /* IDESCSI_DEBUG_LOG */
 431
 432         if (test_bit(PC_TIMEDOUT, &pc->flags)){
 433 #if IDESCSI_DEBUG_LOG
 434                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
 435                                 pc->scsi_cmd->serial_number, jiffies);
 436 #endif
 437                 /* end this request now - scsi should retry it*/
 438                 idescsi_end_request (drive, 1, 0);
 439                 return ide_stopped;
 440         }
 441         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
 442 #if IDESCSI_DEBUG_LOG
 443                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
 444 #endif /* IDESCSI_DEBUG_LOG */
 445                 pc->actually_transferred=pc->request_transfer;
 446                 (void) HWIF(drive)->ide_dma_end(drive);
 447         }
 448
 449         feature.all = 0;
 450         /* Clear the interrupt */
 451         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
 452
 453         if (!status.b.drq) {
 454                 /* No more interrupts */
 455                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 456                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
 457                 local_irq_enable();
 458                 if (status.b.check)
 459                         rq->errors++;
 460                 idescsi_end_request (drive, 1, 0);
 461                 return ide_stopped;
 462         }
 463         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
 464         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
 465         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 466
 467         if (ireason.b.cod) {
 468                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
 469                 return ide_do_reset (drive);
 470         }
 471         if (ireason.b.io) {
 472                 temp = pc->actually_transferred + bcount.all;
 473                 if (temp > pc->request_transfer) {
 474                         if (temp > pc->buffer_size) {
 475                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
 476                                         "send us more data than expected "
 477                                         "- discarding data\n");
 478                                 temp = pc->buffer_size - pc->actually_transferred;
 479                                 if (temp) {
 480                                         clear_bit(PC_WRITING, &pc->flags);
 481                                         if (pc->sg)
 482                                                 idescsi_input_buffers(drive, pc, temp);
 483                                         else
 484                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
 485                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
 486                                 }
 487                                 pc->actually_transferred += temp;
 488                                 pc->current_position += temp;
 489                                 idescsi_discard_data(drive, bcount.all - temp);
 490                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 491                                 return ide_started;
 492                         }
 493 #if IDESCSI_DEBUG_LOG
 494                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
 495 #endif /* IDESCSI_DEBUG_LOG */
 496                 }
 497         }
 498         if (ireason.b.io) {
 499                 clear_bit(PC_WRITING, &pc->flags);
 500                 if (pc->sg)
 501                         idescsi_input_buffers(drive, pc, bcount.all);
 502                 else
 503                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
 504         } else {
 505                 set_bit(PC_WRITING, &pc->flags);
 506                 if (pc->sg)
 507                         idescsi_output_buffers (drive, pc, bcount.all);
 508                 else
 509                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
 510         }
 511         /* Update the current position */
 512         pc->actually_transferred += bcount.all;
 513         pc->current_position += bcount.all;
 514
 515         /* And set the interrupt handler again */
 516         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 517         return ide_started;
 518 }
 519
 520 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 521 {
 522         ide_hwif_t *hwif = drive->hwif;
 523         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 524         idescsi_pc_t *pc = scsi->pc;
 525         atapi_ireason_t ireason;
 526         ide_startstop_t startstop;
 527
 528         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
 529                 printk(KERN_ERR "ide-scsi: Strange, packet command "
 530                         "initiated yet DRQ isn't asserted\n");
 531                 return startstop;
 532         }
 533         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 534         if (!ireason.b.cod || ireason.b.io) {
 535                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
 536                                 "issuing a packet command\n");
 537                 return ide_do_reset (drive);
 538         }
 539         if (HWGROUP(drive)->handler != NULL)
 540                 BUG();
 541         /* Set the interrupt routine */
 542         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 543         /* Send the actual packet */
 544         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
 545         if (test_bit (PC_DMA_OK, &pc->flags)) {
 546                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
 547                 hwif->dma_start(drive);
 548         }
 549         return ide_started;
 550 }
 551
 552 static inline int idescsi_set_direction(idescsi_pc_t *pc)
 553 {
 554         switch (pc->c[0]) {
 555                 case READ_6: case READ_10: case READ_12:
 556                         clear_bit(PC_WRITING, &pc->flags);
 557                         return 0;
 558                 case WRITE_6: case WRITE_10: case WRITE_12:
 559                         set_bit(PC_WRITING, &pc->flags);
 560                         return 0;
 561                 default:
 562                         return 1;
 563         }
 564 }
 565
 566 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
 567 {
 568         ide_hwif_t *hwif = drive->hwif;
 569         struct scatterlist *sg, *scsi_sg;
 570         int segments;
 571
 572         if (!pc->request_transfer || pc->request_transfer % 1024)
 573                 return 1;
 574
 575         if (idescsi_set_direction(pc))
 576                 return 1;
 577
 578         sg = hwif->sg_table;
 579         scsi_sg = pc->scsi_cmd->request_buffer;
 580         segments = pc->scsi_cmd->use_sg;
 581
 582         if (segments > hwif->sg_max_nents)
 583                 return 1;
 584
 585         if (!segments) {
 586                 hwif->sg_nents = 1;
 587                 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
 588         } else {
 589                 hwif->sg_nents = segments;
 590                 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 591         }
 592
 593         return 0;
 594 }
 595
 596 /*
 597  *      Issue a packet command
 598  */
 599 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
 600 {
 601         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 602         ide_hwif_t *hwif = drive->hwif;
 603         atapi_feature_t feature;
 604         atapi_bcount_t bcount;
 605
 606         scsi->pc=pc;                                                    /* Set the current packet command */
 607         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
 608         pc->current_position=pc->buffer;
 609         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
 610
 611         feature.all = 0;
 612         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
 613                 hwif->sg_mapped = 1;
 614                 feature.b.dma = !hwif->dma_setup(drive);
 615                 hwif->sg_mapped = 0;
 616         }
 617
 618         SELECT_DRIVE(drive);
 619         if (IDE_CONTROL_REG)
 620                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
 621
 622         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
 623         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
 624         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
 625
 626         if (feature.b.dma)
 627                 set_bit(PC_DMA_OK, &pc->flags);
 628
 629         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
 630                 if (HWGROUP(drive)->handler != NULL)
 631                         BUG();
 632                 ide_set_handler(drive, &idescsi_transfer_pc,
 633                                 get_timeout(pc), idescsi_expiry);
 634                 /* Issue the packet command */
 635                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 636                 return ide_started;
 637         } else {
 638                 /* Issue the packet command */
 639                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 640                 return idescsi_transfer_pc(drive);
 641         }
 642 }
 643
 644 /*
 645  *      idescsi_do_request is our request handling function.
 646  */
 647 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 648 {
 649 #if IDESCSI_DEBUG_LOG
 650         printk (KERN_INFO "rq_status: %d, dev: %s, cmd: %x, errors: %d\n",rq->rq_status, rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
 651         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
 652 #endif /* IDESCSI_DEBUG_LOG */
 653
 654         if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
 655                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
 656         }
 657         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 658         idescsi_end_request (drive, 0, 0);
 659         return ide_stopped;
 660 }
 661
 662 static void idescsi_add_settings(ide_drive_t *drive)
 663 {
 664         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 665
 666 /*
 667  *                      drive   setting name    read/write      ioctl   ioctl           data type       min     max     mul_factor      div_factor      data pointer            set function
 668  */
 669         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 670         ide_add_setting(drive,  "bios_head",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 671         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 672         ide_add_setting(drive,  "transform",    SETTING_RW,     -1,     -1,             TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 673         ide_add_setting(drive,  "log",          SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 674 }
 675
 676 /*
 677  *      Driver initialization.
 678  */
 679 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 680 {
 681         DRIVER(drive)->busy++;
 682         drive->ready_stat = 0;
 683         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 684                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 685         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
 686         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 687 #if IDESCSI_DEBUG_LOG
 688         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 689 #endif /* IDESCSI_DEBUG_LOG */
 690         idescsi_add_settings(drive);
 691         DRIVER(drive)->busy--;
 692 }
 693
 694 static int idescsi_cleanup (ide_drive_t *drive)
 695 {
 696         struct Scsi_Host *scsihost = drive->driver_data;
 697
 698         if (ide_unregister_subdriver(drive))
 699                 return 1;
 700
 701         /* FIXME?: Are these two statements necessary? */
 702         drive->driver_data = NULL;
 703         drive->disk->fops = ide_fops;
 704
 705         scsi_remove_host(scsihost);
 706         scsi_host_put(scsihost);
 707         return 0;
 708 }
 709
 710 static int idescsi_attach(ide_drive_t *drive);
 711
 712 /*
 713  *      IDE subdriver functions, registered with ide.c
 714  */
 715 static ide_driver_t idescsi_driver = {
 716         .owner                  = THIS_MODULE,
 717         .name                   = "ide-scsi",
 718         .version                = IDESCSI_VERSION,
 719         .media                  = ide_scsi,
 720         .busy                   = 0,
 721         .supports_dsc_overlap   = 0,
 722         .attach                 = idescsi_attach,
 723         .cleanup                = idescsi_cleanup,
 724         .do_request             = idescsi_do_request,
 725         .end_request            = idescsi_end_request,
 726         .error                  = idescsi_atapi_error,
 727         .abort                  = idescsi_atapi_abort,
 728         .drives                 = LIST_HEAD_INIT(idescsi_driver.drives),
 729 };
 730
 731 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 732 {
 733         ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
 734         drive->usage++;
 735         return 0;
 736 }
 737
 738 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 739 {
 740         ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
 741         drive->usage--;
 742         return 0;
 743 }
 744
 745 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 746                         unsigned int cmd, unsigned long arg)
 747 {
 748         struct block_device *bdev = inode->i_bdev;
 749         return generic_ide_ioctl(file, bdev, cmd, arg);
 750 }
 751
 752 static struct block_device_operations idescsi_ops = {
 753         .owner          = THIS_MODULE,
 754         .open           = idescsi_ide_open,
 755         .release        = idescsi_ide_release,
 756         .ioctl          = idescsi_ide_ioctl,
 757 };
 758
 759 static int idescsi_attach(ide_drive_t *drive);
 760
 761 static int idescsi_slave_configure(struct scsi_device * sdp)
 762 {
 763         /* Configure detected device */
 764         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 765         return 0;
 766 }
 767
 768 static const char *idescsi_info (struct Scsi_Host *host)
 769 {
 770         return "SCSI host adapter emulation for IDE ATAPI devices";
 771 }
 772
 773 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 774 {
 775         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 776
 777         if (cmd == SG_SET_TRANSFORM) {
 778                 if (arg)
 779                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 780                 else
 781                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 782                 return 0;
 783         } else if (cmd == SG_GET_TRANSFORM)
 784                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 785         return -EINVAL;
 786 }
 787
 788 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
 789 {
 790         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 791
 792         /* this was a layering violation and we can't support it
 793            anymore, sorry. */
 794 #if 0
 795         struct gendisk *disk = cmd->request->rq_disk;
 796
 797         if (disk) {
 798                 struct Scsi_Device_Template **p = disk->private_data;
 799                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
 800                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 801         }
 802 #endif
 803         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
 804 }
 805
 806 static int idescsi_queue (struct scsi_cmnd *cmd,
 807                 void (*done)(struct scsi_cmnd *))
 808 {
 809         struct Scsi_Host *host = cmd->device->host;
 810         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 811         ide_drive_t *drive = scsi->drive;
 812         struct request *rq = NULL;
 813         idescsi_pc_t *pc = NULL;
 814
 815         if (!drive) {
 816                 printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->device->id);
 817                 goto abort;
 818         }
 819         scsi = drive_to_idescsi(drive);
 820         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 821         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 822         if (rq == NULL || pc == NULL) {
 823                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 824                 goto abort;
 825         }
 826
 827         memset (pc->c, 0, 12);
 828         pc->flags = 0;
 829         pc->rq = rq;
 830         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 831         if (cmd->use_sg) {
 832                 pc->buffer = NULL;
 833                 pc->sg = cmd->request_buffer;
 834         } else {
 835                 pc->buffer = cmd->request_buffer;
 836                 pc->sg = NULL;
 837         }
 838         pc->b_count = 0;
 839         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
 840         pc->scsi_cmd = cmd;
 841         pc->done = done;
 842         pc->timeout = jiffies + cmd->timeout_per_command;
 843
 844         if (should_transform(drive, cmd))
 845                 set_bit(PC_TRANSFORM, &pc->flags);
 846         idescsi_transform_pc1 (drive, pc);
 847
 848         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 849                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 850                 hexdump(cmd->cmnd, cmd->cmd_len);
 851                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 852                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 853                         hexdump(pc->c, 12);
 854                 }
 855         }
 856
 857         ide_init_drive_cmd (rq);
 858         rq->special = (char *) pc;
 859         rq->flags = REQ_SPECIAL;
 860         spin_unlock_irq(host->host_lock);
 861         (void) ide_do_drive_cmd (drive, rq, ide_end);
 862         spin_lock_irq(host->host_lock);
 863         return 0;
 864 abort:
 865         if (pc) kfree (pc);
 866         if (rq) kfree (rq);
 867         cmd->result = DID_ERROR << 16;
 868         done(cmd);
 869         return 0;
 870 }
 871
 872 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 873 {
 874         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 875         ide_drive_t    *drive = scsi->drive;
 876         int             busy;
 877         int             ret   = FAILED;
 878
 879         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 880
 881         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 882                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 883
 884         if (!drive) {
 885                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 886                 WARN_ON(1);
 887                 goto no_drive;
 888         }
 889
 890         /* First give it some more time, how much is "right" is hard to say :-( */
 891
 892         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 893         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 894                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 895
 896         spin_lock_irq(&ide_lock);
 897
 898         /* If there is no pc running we're done (our interrupt took care of it) */
 899         if (!scsi->pc) {
 900                 ret = SUCCESS;
 901                 goto ide_unlock;
 902         }
 903
 904         /* It's somewhere in flight. Does ide subsystem agree? */
 905         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 906             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 907                 /*
 908                  * FIXME - not sure this condition can ever occur
 909                  */
 910                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 911
 912                 if (scsi->pc->rq->flags & REQ_SENSE)
 913                         kfree(scsi->pc->buffer);
 914                 kfree(scsi->pc->rq);
 915                 kfree(scsi->pc);
 916                 scsi->pc = NULL;
 917
 918                 ret = SUCCESS;
 919         }
 920
 921 ide_unlock:
 922         spin_unlock_irq(&ide_lock);
 923 no_drive:
 924         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 925                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 926
 927         return ret;
 928 }
 929
 930 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 931 {
 932         struct request *req;
 933         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 934         ide_drive_t    *drive = scsi->drive;
 935         int             ready = 0;
 936         int             ret   = SUCCESS;
 937
 938         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 939
 940         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 941                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 942
 943         if (!drive) {
 944                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 945                 WARN_ON(1);
 946                 return FAILED;
 947         }
 948
 949         spin_lock_irq(&ide_lock);
 950
 951         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 952                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 953                 spin_unlock(&ide_lock);
 954                 return FAILED;
 955         }
 956
 957         /* kill current request */
 958         blkdev_dequeue_request(req);
 959         end_that_request_last(req);
 960         if (req->flags & REQ_SENSE)
 961                 kfree(scsi->pc->buffer);
 962         kfree(scsi->pc);
 963         scsi->pc = NULL;
 964         kfree(req);
 965
 966         /* now nuke the drive queue */
 967         while ((req = elv_next_request(drive->queue))) {
 968                 blkdev_dequeue_request(req);
 969                 end_that_request_last(req);
 970         }
 971
 972         HWGROUP(drive)->rq = NULL;
 973         HWGROUP(drive)->handler = NULL;
 974         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 975         spin_unlock_irq(&ide_lock);
 976
 977         ide_do_reset(drive);
 978
 979         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 980
 981         do {
 982                 set_current_state(TASK_UNINTERRUPTIBLE);
 983                 spin_unlock_irq(cmd->device->host->host_lock);
 984                 schedule_timeout(HZ/20);
 985                 spin_lock_irq(cmd->device->host->host_lock);
 986         } while ( HWGROUP(drive)->handler );
 987
 988         ready = drive_is_ready(drive);
 989         HWGROUP(drive)->busy--;
 990         if (!ready) {
 991                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 992                 ret = FAILED;
 993         }
 994
 995         return ret;
 996 }
 997
 998 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 999                 sector_t capacity, int *parm)
1000 {
1001         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1002         ide_drive_t *drive = idescsi->drive;
1003
1004         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1005                 parm[0] = drive->bios_head;
1006                 parm[1] = drive->bios_sect;
1007                 parm[2] = drive->bios_cyl;
1008         }
1009         return 0;
1010 }
1011
1012 static struct scsi_host_template idescsi_template = {
1013         .module                 = THIS_MODULE,
1014         .name                   = "idescsi",
1015         .info                   = idescsi_info,
1016         .slave_configure        = idescsi_slave_configure,
1017         .ioctl                  = idescsi_ioctl,
1018         .queuecommand           = idescsi_queue,
1019         .eh_abort_handler       = idescsi_eh_abort,
1020         .eh_host_reset_handler  = idescsi_eh_reset,
1021         .bios_param             = idescsi_bios,
1022         .can_queue              = 40,
1023         .this_id                = -1,
1024         .sg_tablesize           = 256,
1025         .cmd_per_lun            = 5,
1026         .max_sectors            = 128,
1027         .use_clustering         = DISABLE_CLUSTERING,
1028         .emulated               = 1,
1029         .proc_name              = "ide-scsi",
1030 };
1031
1032 static int idescsi_attach(ide_drive_t *drive)
1033 {
1034         idescsi_scsi_t *idescsi;
1035         struct Scsi_Host *host;
1036         static int warned;
1037         int err;
1038
1039         if (!warned && drive->media == ide_cdrom) {
1040                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1041                 warned = 1;
1042         }
1043
1044         if (!strstr("ide-scsi", drive->driver_req) ||
1045             !drive->present ||
1046             drive->media == ide_disk ||
1047             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1048                 return 1;
1049
1050         host->max_id = 1;
1051
1052 #if IDESCSI_DEBUG_LOG
1053         if (drive->id->last_lun)
1054                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1055 #endif
1056         if ((drive->id->last_lun & 0x7) != 7)
1057                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1058         else
1059                 host->max_lun = 1;
1060
1061         drive->driver_data = host;
1062         idescsi = scsihost_to_idescsi(host);
1063         idescsi->drive = drive;
1064         err = ide_register_subdriver(drive, &idescsi_driver);
1065         if (!err) {
1066                 idescsi_setup (drive, idescsi);
1067                 drive->disk->fops = &idescsi_ops;
1068                 err = scsi_add_host(host, &drive->gendev);
1069                 if (!err) {
1070                         scsi_scan_host(host);
1071                         return 0;
1072                 }
1073                 /* fall through on error */
1074                 ide_unregister_subdriver(drive);
1075         }
1076
1077         scsi_host_put(host);
1078         return err;
1079 }
1080
1081 static int __init init_idescsi_module(void)
1082 {
1083         return ide_register_driver(&idescsi_driver);
1084 }
1085
1086 static void __exit exit_idescsi_module(void)
1087 {
1088         ide_unregister_driver(&idescsi_driver);
1089 }
1090
1091 module_init(init_idescsi_module);
1092 module_exit(exit_idescsi_module);
1093 MODULE_LICENSE("GPL");