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 #include <linux/delay.h>
  50
  51 #include <asm/io.h>
  52 #include <asm/bitops.h>
  53 #include <asm/uaccess.h>
  54
  55 #include <scsi/scsi.h>
  56 #include <scsi/scsi_cmnd.h>
  57 #include <scsi/scsi_device.h>
  58 #include <scsi/scsi_host.h>
  59 #include <scsi/scsi_tcq.h>
  60 #include <scsi/sg.h>
  61
  62 #define IDESCSI_DEBUG_LOG               0
  63
  64 typedef struct idescsi_pc_s {
  65         u8 c[12];                               /* Actual packet bytes */
  66         int request_transfer;                   /* Bytes to transfer */
  67         int actually_transferred;               /* Bytes actually transferred */
  68         int buffer_size;                        /* Size of our data buffer */
  69         struct request *rq;                     /* The corresponding request */
  70         u8 *buffer;                             /* Data buffer */
  71         u8 *current_position;                   /* Pointer into the above buffer */
  72         struct scatterlist *sg;                 /* Scatter gather table */
  73         int b_count;                            /* Bytes transferred from current entry */
  74         struct scsi_cmnd *scsi_cmd;             /* SCSI command */
  75         void (*done)(struct scsi_cmnd *);       /* Scsi completion routine */
  76         unsigned long flags;                    /* Status/Action flags */
  77         unsigned long timeout;                  /* Command timeout */
  78 } idescsi_pc_t;
  79
  80 /*
  81  *      Packet command status bits.
  82  */
  83 #define PC_DMA_IN_PROGRESS              0       /* 1 while DMA in progress */
  84 #define PC_WRITING                      1       /* Data direction */
  85 #define PC_TRANSFORM                    2       /* transform SCSI commands */
  86 #define PC_TIMEDOUT                     3       /* command timed out */
  87 #define PC_DMA_OK                       4       /* Use DMA */
  88
  89 /*
  90  *      SCSI command transformation layer
  91  */
  92 #define IDESCSI_TRANSFORM               0       /* Enable/Disable transformation */
  93 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
  94
  95 /*
  96  *      Log flags
  97  */
  98 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
  99
 100 typedef struct ide_scsi_obj {
 101         ide_drive_t             *drive;
 102         ide_driver_t            *driver;
 103         struct gendisk          *disk;
 104         struct Scsi_Host        *host;
 105
 106         idescsi_pc_t *pc;                       /* Current packet command */
 107         unsigned long flags;                    /* Status/Action flags */
 108         unsigned long transform;                /* SCSI cmd translation layer */
 109         unsigned long log;                      /* log flags */
 110 } idescsi_scsi_t;
 111
 112 static DECLARE_MUTEX(idescsi_ref_sem);
 113
 114 #define ide_scsi_g(disk) \
 115         container_of((disk)->private_data, struct ide_scsi_obj, driver)
 116
 117 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
 118 {
 119         struct ide_scsi_obj *scsi = NULL;
 120
 121         down(&idescsi_ref_sem);
 122         scsi = ide_scsi_g(disk);
 123         if (scsi)
 124                 scsi_host_get(scsi->host);
 125         up(&idescsi_ref_sem);
 126         return scsi;
 127 }
 128
 129 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 130 {
 131         down(&idescsi_ref_sem);
 132         scsi_host_put(scsi->host);
 133         up(&idescsi_ref_sem);
 134 }
 135
 136 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 137 {
 138         return (idescsi_scsi_t*) (&host[1]);
 139 }
 140
 141 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 142 {
 143         return scsihost_to_idescsi(ide_drive->driver_data);
 144 }
 145
 146 /*
 147  *      Per ATAPI device status bits.
 148  */
 149 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
 150
 151 /*
 152  *      ide-scsi requests.
 153  */
 154 #define IDESCSI_PC_RQ                   90
 155
 156 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
 157 {
 158         while (bcount--)
 159                 (void) HWIF(drive)->INB(IDE_DATA_REG);
 160 }
 161
 162 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
 163 {
 164         while (bcount--)
 165                 HWIF(drive)->OUTB(0, IDE_DATA_REG);
 166 }
 167
 168 /*
 169  *      PIO data transfer routines using the scatter gather table.
 170  */
 171 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 172 {
 173         int count;
 174         char *buf;
 175
 176         while (bcount) {
 177                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 178                         printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
 179                         idescsi_discard_data (drive, bcount);
 180                         return;
 181                 }
 182                 count = min(pc->sg->length - pc->b_count, bcount);
 183                 buf = kmap_atomic(pc->sg->page, KM_IRQ0);
 184                 drive->hwif->atapi_input_bytes(drive,
 185                                 buf + pc->b_count + pc->sg->offset, count);
 186                 kunmap_atomic(buf, KM_IRQ0);
 187                 bcount -= count;
 188                 pc->b_count += count;
 189                 if (pc->b_count == pc->sg->length) {
 190                         pc->sg++;
 191                         pc->b_count = 0;
 192                 }
 193         }
 194 }
 195
 196 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 197 {
 198         int count;
 199         char *buf;
 200
 201         while (bcount) {
 202                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 203                         printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
 204                         idescsi_output_zeros (drive, bcount);
 205                         return;
 206                 }
 207                 count = min(pc->sg->length - pc->b_count, bcount);
 208                 buf = kmap_atomic(pc->sg->page, KM_IRQ0);
 209                 drive->hwif->atapi_output_bytes(drive,
 210                                 buf + pc->b_count + pc->sg->offset, count);
 211                 kunmap_atomic(buf, KM_IRQ0);
 212                 bcount -= count;
 213                 pc->b_count += count;
 214                 if (pc->b_count == pc->sg->length) {
 215                         pc->sg++;
 216                         pc->b_count = 0;
 217                 }
 218         }
 219 }
 220
 221 /*
 222  *      Most of the SCSI commands are supported directly by ATAPI devices.
 223  *      idescsi_transform_pc handles the few exceptions.
 224  */
 225 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
 226 {
 227         u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
 228         char *atapi_buf;
 229
 230         if (!test_bit(PC_TRANSFORM, &pc->flags))
 231                 return;
 232         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 233                 if (c[0] == READ_6 || c[0] == WRITE_6) {
 234                         c[8] = c[4];            c[5] = c[3];            c[4] = c[2];
 235                         c[3] = c[1] & 0x1f;     c[2] = 0;               c[1] &= 0xe0;
 236                         c[0] += (READ_10 - READ_6);
 237                 }
 238                 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
 239                         unsigned short new_len;
 240                         if (!scsi_buf)
 241                                 return;
 242                         if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
 243                                 return;
 244                         memset(atapi_buf, 0, pc->buffer_size + 4);
 245                         memset (c, 0, 12);
 246                         c[0] = sc[0] | 0x40;
 247                         c[1] = sc[1];
 248                         c[2] = sc[2];
 249                         new_len = sc[4] + 4;
 250                         c[8] = new_len;
 251                         c[7] = new_len >> 8;
 252                         c[9] = sc[5];
 253                         if (c[0] == MODE_SELECT_10) {
 254                                 atapi_buf[1] = scsi_buf[0];     /* Mode data length */
 255                                 atapi_buf[2] = scsi_buf[1];     /* Medium type */
 256                                 atapi_buf[3] = scsi_buf[2];     /* Device specific parameter */
 257                                 atapi_buf[7] = scsi_buf[3];     /* Block descriptor length */
 258                                 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
 259                         }
 260                         pc->buffer = atapi_buf;
 261                         pc->request_transfer += 4;
 262                         pc->buffer_size += 4;
 263                 }
 264         }
 265 }
 266
 267 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
 268 {
 269         u8 *atapi_buf = pc->buffer;
 270         u8 *sc = pc->scsi_cmd->cmnd;
 271         u8 *scsi_buf = pc->scsi_cmd->request_buffer;
 272
 273         if (!test_bit(PC_TRANSFORM, &pc->flags))
 274                 return;
 275         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 276                 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
 277                         scsi_buf[0] = atapi_buf[1];             /* Mode data length */
 278                         scsi_buf[1] = atapi_buf[2];             /* Medium type */
 279                         scsi_buf[2] = atapi_buf[3];             /* Device specific parameter */
 280                         scsi_buf[3] = atapi_buf[7];             /* Block descriptor length */
 281                         memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
 282                 }
 283                 if (pc->c[0] == INQUIRY) {
 284                         scsi_buf[2] |= 2;                       /* ansi_revision */
 285                         scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
 286                 }
 287         }
 288         if (atapi_buf && atapi_buf != scsi_buf)
 289                 kfree(atapi_buf);
 290 }
 291
 292 static void hexdump(u8 *x, int len)
 293 {
 294         int i;
 295
 296         printk("[ ");
 297         for (i = 0; i < len; i++)
 298                 printk("%x ", x[i]);
 299         printk("]\n");
 300 }
 301
 302 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
 303 {
 304         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 305         idescsi_pc_t   *pc;
 306         struct request *rq;
 307         u8             *buf;
 308
 309         /* stuff a sense request in front of our current request */
 310         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 311         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 312         buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 313         if (pc == NULL || rq == NULL || buf == NULL) {
 314                 if (pc) kfree(pc);
 315                 if (rq) kfree(rq);
 316                 if (buf) kfree(buf);
 317                 return -ENOMEM;
 318         }
 319         memset (pc, 0, sizeof (idescsi_pc_t));
 320         memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
 321         ide_init_drive_cmd(rq);
 322         rq->special = (char *) pc;
 323         pc->rq = rq;
 324         pc->buffer = buf;
 325         pc->c[0] = REQUEST_SENSE;
 326         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
 327         rq->flags = REQ_SENSE;
 328         pc->timeout = jiffies + WAIT_READY;
 329         /* NOTE! Save the failed packet command in "rq->buffer" */
 330         rq->buffer = (void *) failed_command->special;
 331         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
 332         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 333                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 334                 hexdump(pc->c, 6);
 335         }
 336         rq->rq_disk = scsi->disk;
 337         return ide_do_drive_cmd(drive, rq, ide_preempt);
 338 }
 339
 340 static int idescsi_end_request(ide_drive_t *, int, int);
 341
 342 static ide_startstop_t
 343 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 344 {
 345         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
 346                 /* force an abort */
 347                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
 348
 349         rq->errors++;
 350
 351         idescsi_end_request(drive, 0, 0);
 352
 353         return ide_stopped;
 354 }
 355
 356 static ide_startstop_t
 357 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 358 {
 359 #if IDESCSI_DEBUG_LOG
 360         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
 361                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
 362 #endif
 363         rq->errors |= ERROR_MAX;
 364
 365         idescsi_end_request(drive, 0, 0);
 366
 367         return ide_stopped;
 368 }
 369
 370 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 371 {
 372         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 373         struct request *rq = HWGROUP(drive)->rq;
 374         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
 375         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 376         struct Scsi_Host *host;
 377         u8 *scsi_buf;
 378         unsigned long flags;
 379
 380         if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
 381                 ide_end_request(drive, uptodate, nrsecs);
 382                 return 0;
 383         }
 384         ide_end_drive_cmd (drive, 0, 0);
 385         if (rq->flags & REQ_SENSE) {
 386                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
 387                 if (log) {
 388                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 389                         hexdump(pc->buffer,16);
 390                 }
 391                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
 392                 kfree(pc->buffer);
 393                 kfree(pc);
 394                 kfree(rq);
 395                 pc = opc;
 396                 rq = pc->rq;
 397                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 398                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
 399         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
 400                 if (log)
 401                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 402                                         drive->name, pc->scsi_cmd->serial_number);
 403                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 404         } else if (rq->errors >= ERROR_MAX) {
 405                 pc->scsi_cmd->result = DID_ERROR << 16;
 406                 if (log)
 407                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 408         } else if (rq->errors) {
 409                 if (log)
 410                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 411                 if (!idescsi_check_condition(drive, rq))
 412                         /* we started a request sense, so we'll be back, exit for now */
 413                         return 0;
 414                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 415         } else {
 416                 pc->scsi_cmd->result = DID_OK << 16;
 417                 idescsi_transform_pc2 (drive, pc);
 418                 if (log) {
 419                         printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
 420                         if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
 421                                 printk(", rst = ");
 422                                 scsi_buf = pc->scsi_cmd->request_buffer;
 423                                 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
 424                         } else printk("\n");
 425                 }
 426         }
 427         host = pc->scsi_cmd->device->host;
 428         spin_lock_irqsave(host->host_lock, flags);
 429         pc->done(pc->scsi_cmd);
 430         spin_unlock_irqrestore(host->host_lock, flags);
 431         kfree(pc);
 432         kfree(rq);
 433         scsi->pc = NULL;
 434         return 0;
 435 }
 436
 437 static inline unsigned long get_timeout(idescsi_pc_t *pc)
 438 {
 439         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 440 }
 441
 442 static int idescsi_expiry(ide_drive_t *drive)
 443 {
 444         idescsi_scsi_t *scsi = drive->driver_data;
 445         idescsi_pc_t   *pc   = scsi->pc;
 446
 447 #if IDESCSI_DEBUG_LOG
 448         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
 449 #endif
 450         set_bit(PC_TIMEDOUT, &pc->flags);
 451
 452         return 0;                                       /* we do not want the ide subsystem to retry */
 453 }
 454
 455 /*
 456  *      Our interrupt handler.
 457  */
 458 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 459 {
 460         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 461         idescsi_pc_t *pc=scsi->pc;
 462         struct request *rq = pc->rq;
 463         atapi_bcount_t bcount;
 464         atapi_status_t status;
 465         atapi_ireason_t ireason;
 466         atapi_feature_t feature;
 467
 468         unsigned int temp;
 469
 470 #if IDESCSI_DEBUG_LOG
 471         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
 472 #endif /* IDESCSI_DEBUG_LOG */
 473
 474         if (test_bit(PC_TIMEDOUT, &pc->flags)){
 475 #if IDESCSI_DEBUG_LOG
 476                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
 477                                 pc->scsi_cmd->serial_number, jiffies);
 478 #endif
 479                 /* end this request now - scsi should retry it*/
 480                 idescsi_end_request (drive, 1, 0);
 481                 return ide_stopped;
 482         }
 483         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
 484 #if IDESCSI_DEBUG_LOG
 485                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
 486 #endif /* IDESCSI_DEBUG_LOG */
 487                 pc->actually_transferred=pc->request_transfer;
 488                 (void) HWIF(drive)->ide_dma_end(drive);
 489         }
 490
 491         feature.all = 0;
 492         /* Clear the interrupt */
 493         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
 494
 495         if (!status.b.drq) {
 496                 /* No more interrupts */
 497                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 498                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
 499                 local_irq_enable();
 500                 if (status.b.check)
 501                         rq->errors++;
 502                 idescsi_end_request (drive, 1, 0);
 503                 return ide_stopped;
 504         }
 505         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
 506         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
 507         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 508
 509         if (ireason.b.cod) {
 510                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
 511                 return ide_do_reset (drive);
 512         }
 513         if (ireason.b.io) {
 514                 temp = pc->actually_transferred + bcount.all;
 515                 if (temp > pc->request_transfer) {
 516                         if (temp > pc->buffer_size) {
 517                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
 518                                         "send us more data than expected "
 519                                         "- discarding data\n");
 520                                 temp = pc->buffer_size - pc->actually_transferred;
 521                                 if (temp) {
 522                                         clear_bit(PC_WRITING, &pc->flags);
 523                                         if (pc->sg)
 524                                                 idescsi_input_buffers(drive, pc, temp);
 525                                         else
 526                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
 527                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
 528                                 }
 529                                 pc->actually_transferred += temp;
 530                                 pc->current_position += temp;
 531                                 idescsi_discard_data(drive, bcount.all - temp);
 532                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 533                                 return ide_started;
 534                         }
 535 #if IDESCSI_DEBUG_LOG
 536                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
 537 #endif /* IDESCSI_DEBUG_LOG */
 538                 }
 539         }
 540         if (ireason.b.io) {
 541                 clear_bit(PC_WRITING, &pc->flags);
 542                 if (pc->sg)
 543                         idescsi_input_buffers(drive, pc, bcount.all);
 544                 else
 545                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
 546         } else {
 547                 set_bit(PC_WRITING, &pc->flags);
 548                 if (pc->sg)
 549                         idescsi_output_buffers (drive, pc, bcount.all);
 550                 else
 551                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
 552         }
 553         /* Update the current position */
 554         pc->actually_transferred += bcount.all;
 555         pc->current_position += bcount.all;
 556
 557         /* And set the interrupt handler again */
 558         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 559         return ide_started;
 560 }
 561
 562 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 563 {
 564         ide_hwif_t *hwif = drive->hwif;
 565         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 566         idescsi_pc_t *pc = scsi->pc;
 567         atapi_ireason_t ireason;
 568         ide_startstop_t startstop;
 569
 570         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
 571                 printk(KERN_ERR "ide-scsi: Strange, packet command "
 572                         "initiated yet DRQ isn't asserted\n");
 573                 return startstop;
 574         }
 575         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 576         if (!ireason.b.cod || ireason.b.io) {
 577                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
 578                                 "issuing a packet command\n");
 579                 return ide_do_reset (drive);
 580         }
 581         if (HWGROUP(drive)->handler != NULL)
 582                 BUG();
 583         /* Set the interrupt routine */
 584         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 585         /* Send the actual packet */
 586         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
 587         if (test_bit (PC_DMA_OK, &pc->flags)) {
 588                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
 589                 hwif->dma_start(drive);
 590         }
 591         return ide_started;
 592 }
 593
 594 static inline int idescsi_set_direction(idescsi_pc_t *pc)
 595 {
 596         switch (pc->c[0]) {
 597                 case READ_6: case READ_10: case READ_12:
 598                         clear_bit(PC_WRITING, &pc->flags);
 599                         return 0;
 600                 case WRITE_6: case WRITE_10: case WRITE_12:
 601                         set_bit(PC_WRITING, &pc->flags);
 602                         return 0;
 603                 default:
 604                         return 1;
 605         }
 606 }
 607
 608 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
 609 {
 610         ide_hwif_t *hwif = drive->hwif;
 611         struct scatterlist *sg, *scsi_sg;
 612         int segments;
 613
 614         if (!pc->request_transfer || pc->request_transfer % 1024)
 615                 return 1;
 616
 617         if (idescsi_set_direction(pc))
 618                 return 1;
 619
 620         sg = hwif->sg_table;
 621         scsi_sg = pc->scsi_cmd->request_buffer;
 622         segments = pc->scsi_cmd->use_sg;
 623
 624         if (segments > hwif->sg_max_nents)
 625                 return 1;
 626
 627         if (!segments) {
 628                 hwif->sg_nents = 1;
 629                 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
 630         } else {
 631                 hwif->sg_nents = segments;
 632                 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 633         }
 634
 635         return 0;
 636 }
 637
 638 /*
 639  *      Issue a packet command
 640  */
 641 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
 642 {
 643         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 644         ide_hwif_t *hwif = drive->hwif;
 645         atapi_feature_t feature;
 646         atapi_bcount_t bcount;
 647
 648         scsi->pc=pc;                                                    /* Set the current packet command */
 649         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
 650         pc->current_position=pc->buffer;
 651         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
 652
 653         feature.all = 0;
 654         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
 655                 hwif->sg_mapped = 1;
 656                 feature.b.dma = !hwif->dma_setup(drive);
 657                 hwif->sg_mapped = 0;
 658         }
 659
 660         SELECT_DRIVE(drive);
 661         if (IDE_CONTROL_REG)
 662                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
 663
 664         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
 665         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
 666         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
 667
 668         if (feature.b.dma)
 669                 set_bit(PC_DMA_OK, &pc->flags);
 670
 671         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
 672                 if (HWGROUP(drive)->handler != NULL)
 673                         BUG();
 674                 ide_set_handler(drive, &idescsi_transfer_pc,
 675                                 get_timeout(pc), idescsi_expiry);
 676                 /* Issue the packet command */
 677                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 678                 return ide_started;
 679         } else {
 680                 /* Issue the packet command */
 681                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 682                 return idescsi_transfer_pc(drive);
 683         }
 684 }
 685
 686 /*
 687  *      idescsi_do_request is our request handling function.
 688  */
 689 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 690 {
 691 #if IDESCSI_DEBUG_LOG
 692         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);
 693         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
 694 #endif /* IDESCSI_DEBUG_LOG */
 695
 696         if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
 697                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
 698         }
 699         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 700         idescsi_end_request (drive, 0, 0);
 701         return ide_stopped;
 702 }
 703
 704 static void idescsi_add_settings(ide_drive_t *drive)
 705 {
 706         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 707
 708 /*
 709  *                      drive   setting name    read/write      ioctl   ioctl           data type       min     max     mul_factor      div_factor      data pointer            set function
 710  */
 711         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 712         ide_add_setting(drive,  "bios_head",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 713         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 714         ide_add_setting(drive,  "transform",    SETTING_RW,     -1,     -1,             TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 715         ide_add_setting(drive,  "log",          SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 716 }
 717
 718 /*
 719  *      Driver initialization.
 720  */
 721 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 722 {
 723         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 724                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 725         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
 726         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 727 #if IDESCSI_DEBUG_LOG
 728         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 729 #endif /* IDESCSI_DEBUG_LOG */
 730         idescsi_add_settings(drive);
 731 }
 732
 733 static int ide_scsi_remove(struct device *dev)
 734 {
 735         ide_drive_t *drive = to_ide_device(dev);
 736         struct Scsi_Host *scsihost = drive->driver_data;
 737         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 738         struct gendisk *g = scsi->disk;
 739
 740         ide_unregister_subdriver(drive, scsi->driver);
 741
 742         ide_unregister_region(g);
 743
 744         drive->driver_data = NULL;
 745         g->private_data = NULL;
 746         put_disk(g);
 747
 748         scsi_remove_host(scsihost);
 749         ide_scsi_put(scsi);
 750
 751         return 0;
 752 }
 753
 754 static int ide_scsi_probe(struct device *);
 755
 756 #ifdef CONFIG_PROC_FS
 757 static ide_proc_entry_t idescsi_proc[] = {
 758         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 759         { NULL, 0, NULL, NULL }
 760 };
 761 #else
 762 # define idescsi_proc   NULL
 763 #endif
 764
 765 static ide_driver_t idescsi_driver = {
 766         .owner                  = THIS_MODULE,
 767         .gen_driver = {
 768                 .name           = "ide-scsi",
 769                 .bus            = &ide_bus_type,
 770                 .probe          = ide_scsi_probe,
 771                 .remove         = ide_scsi_remove,
 772         },
 773         .version                = IDESCSI_VERSION,
 774         .media                  = ide_scsi,
 775         .supports_dsc_overlap   = 0,
 776         .proc                   = idescsi_proc,
 777         .do_request             = idescsi_do_request,
 778         .end_request            = idescsi_end_request,
 779         .error                  = idescsi_atapi_error,
 780         .abort                  = idescsi_atapi_abort,
 781 };
 782
 783 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 784 {
 785         struct gendisk *disk = inode->i_bdev->bd_disk;
 786         struct ide_scsi_obj *scsi;
 787         ide_drive_t *drive;
 788
 789         if (!(scsi = ide_scsi_get(disk)))
 790                 return -ENXIO;
 791
 792         drive = scsi->drive;
 793
 794         drive->usage++;
 795
 796         return 0;
 797 }
 798
 799 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 800 {
 801         struct gendisk *disk = inode->i_bdev->bd_disk;
 802         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 803         ide_drive_t *drive = scsi->drive;
 804
 805         drive->usage--;
 806
 807         ide_scsi_put(scsi);
 808
 809         return 0;
 810 }
 811
 812 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 813                         unsigned int cmd, unsigned long arg)
 814 {
 815         struct block_device *bdev = inode->i_bdev;
 816         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 817         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 818 }
 819
 820 static struct block_device_operations idescsi_ops = {
 821         .owner          = THIS_MODULE,
 822         .open           = idescsi_ide_open,
 823         .release        = idescsi_ide_release,
 824         .ioctl          = idescsi_ide_ioctl,
 825 };
 826
 827 static int idescsi_slave_configure(struct scsi_device * sdp)
 828 {
 829         /* Configure detected device */
 830         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 831         return 0;
 832 }
 833
 834 static const char *idescsi_info (struct Scsi_Host *host)
 835 {
 836         return "SCSI host adapter emulation for IDE ATAPI devices";
 837 }
 838
 839 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 840 {
 841         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 842
 843         if (cmd == SG_SET_TRANSFORM) {
 844                 if (arg)
 845                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 846                 else
 847                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 848                 return 0;
 849         } else if (cmd == SG_GET_TRANSFORM)
 850                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 851         return -EINVAL;
 852 }
 853
 854 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
 855 {
 856         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 857
 858         /* this was a layering violation and we can't support it
 859            anymore, sorry. */
 860 #if 0
 861         struct gendisk *disk = cmd->request->rq_disk;
 862
 863         if (disk) {
 864                 struct Scsi_Device_Template **p = disk->private_data;
 865                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
 866                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 867         }
 868 #endif
 869         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
 870 }
 871
 872 static int idescsi_queue (struct scsi_cmnd *cmd,
 873                 void (*done)(struct scsi_cmnd *))
 874 {
 875         struct Scsi_Host *host = cmd->device->host;
 876         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 877         ide_drive_t *drive = scsi->drive;
 878         struct request *rq = NULL;
 879         idescsi_pc_t *pc = NULL;
 880
 881         if (!drive) {
 882                 printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->device->id);
 883                 goto abort;
 884         }
 885         scsi = drive_to_idescsi(drive);
 886         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 887         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 888         if (rq == NULL || pc == NULL) {
 889                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 890                 goto abort;
 891         }
 892
 893         memset (pc->c, 0, 12);
 894         pc->flags = 0;
 895         pc->rq = rq;
 896         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 897         if (cmd->use_sg) {
 898                 pc->buffer = NULL;
 899                 pc->sg = cmd->request_buffer;
 900         } else {
 901                 pc->buffer = cmd->request_buffer;
 902                 pc->sg = NULL;
 903         }
 904         pc->b_count = 0;
 905         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
 906         pc->scsi_cmd = cmd;
 907         pc->done = done;
 908         pc->timeout = jiffies + cmd->timeout_per_command;
 909
 910         if (should_transform(drive, cmd))
 911                 set_bit(PC_TRANSFORM, &pc->flags);
 912         idescsi_transform_pc1 (drive, pc);
 913
 914         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 915                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 916                 hexdump(cmd->cmnd, cmd->cmd_len);
 917                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 918                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 919                         hexdump(pc->c, 12);
 920                 }
 921         }
 922
 923         ide_init_drive_cmd (rq);
 924         rq->special = (char *) pc;
 925         rq->flags = REQ_SPECIAL;
 926         spin_unlock_irq(host->host_lock);
 927         rq->rq_disk = scsi->disk;
 928         (void) ide_do_drive_cmd (drive, rq, ide_end);
 929         spin_lock_irq(host->host_lock);
 930         return 0;
 931 abort:
 932         if (pc) kfree (pc);
 933         if (rq) kfree (rq);
 934         cmd->result = DID_ERROR << 16;
 935         done(cmd);
 936         return 0;
 937 }
 938
 939 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 940 {
 941         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 942         ide_drive_t    *drive = scsi->drive;
 943         int             busy;
 944         int             ret   = FAILED;
 945
 946         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 947
 948         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 949                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 950
 951         if (!drive) {
 952                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 953                 WARN_ON(1);
 954                 goto no_drive;
 955         }
 956
 957         /* First give it some more time, how much is "right" is hard to say :-( */
 958
 959         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 960         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 961                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 962
 963         spin_lock_irq(&ide_lock);
 964
 965         /* If there is no pc running we're done (our interrupt took care of it) */
 966         if (!scsi->pc) {
 967                 ret = SUCCESS;
 968                 goto ide_unlock;
 969         }
 970
 971         /* It's somewhere in flight. Does ide subsystem agree? */
 972         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 973             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 974                 /*
 975                  * FIXME - not sure this condition can ever occur
 976                  */
 977                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 978
 979                 if (scsi->pc->rq->flags & REQ_SENSE)
 980                         kfree(scsi->pc->buffer);
 981                 kfree(scsi->pc->rq);
 982                 kfree(scsi->pc);
 983                 scsi->pc = NULL;
 984
 985                 ret = SUCCESS;
 986         }
 987
 988 ide_unlock:
 989         spin_unlock_irq(&ide_lock);
 990 no_drive:
 991         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 992                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 993
 994         return ret;
 995 }
 996
 997 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 998 {
 999         struct request *req;
1000         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
1001         ide_drive_t    *drive = scsi->drive;
1002         int             ready = 0;
1003         int             ret   = SUCCESS;
1004
1005         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1006
1007         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1008                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1009
1010         if (!drive) {
1011                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1012                 WARN_ON(1);
1013                 return FAILED;
1014         }
1015
1016         spin_lock_irq(cmd->device->host->host_lock);
1017         spin_lock(&ide_lock);
1018
1019         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1020                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1021                 spin_unlock(&ide_lock);
1022                 spin_unlock_irq(cmd->device->host->host_lock);
1023                 return FAILED;
1024         }
1025
1026         /* kill current request */
1027         blkdev_dequeue_request(req);
1028         end_that_request_last(req);
1029         if (req->flags & REQ_SENSE)
1030                 kfree(scsi->pc->buffer);
1031         kfree(scsi->pc);
1032         scsi->pc = NULL;
1033         kfree(req);
1034
1035         /* now nuke the drive queue */
1036         while ((req = elv_next_request(drive->queue))) {
1037                 blkdev_dequeue_request(req);
1038                 end_that_request_last(req);
1039         }
1040
1041         HWGROUP(drive)->rq = NULL;
1042         HWGROUP(drive)->handler = NULL;
1043         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
1044         spin_unlock(&ide_lock);
1045
1046         ide_do_reset(drive);
1047
1048         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1049
1050         do {
1051                 spin_unlock_irq(cmd->device->host->host_lock);
1052                 msleep(50);
1053                 spin_lock_irq(cmd->device->host->host_lock);
1054         } while ( HWGROUP(drive)->handler );
1055
1056         ready = drive_is_ready(drive);
1057         HWGROUP(drive)->busy--;
1058         if (!ready) {
1059                 printk (KERN_ERR "ide-scsi: reset failed!\n");
1060                 ret = FAILED;
1061         }
1062
1063         spin_unlock_irq(cmd->device->host->host_lock);
1064         return ret;
1065 }
1066
1067 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1068                 sector_t capacity, int *parm)
1069 {
1070         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1071         ide_drive_t *drive = idescsi->drive;
1072
1073         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1074                 parm[0] = drive->bios_head;
1075                 parm[1] = drive->bios_sect;
1076                 parm[2] = drive->bios_cyl;
1077         }
1078         return 0;
1079 }
1080
1081 static struct scsi_host_template idescsi_template = {
1082         .module                 = THIS_MODULE,
1083         .name                   = "idescsi",
1084         .info                   = idescsi_info,
1085         .slave_configure        = idescsi_slave_configure,
1086         .ioctl                  = idescsi_ioctl,
1087         .queuecommand           = idescsi_queue,
1088         .eh_abort_handler       = idescsi_eh_abort,
1089         .eh_host_reset_handler  = idescsi_eh_reset,
1090         .bios_param             = idescsi_bios,
1091         .can_queue              = 40,
1092         .this_id                = -1,
1093         .sg_tablesize           = 256,
1094         .cmd_per_lun            = 5,
1095         .max_sectors            = 128,
1096         .use_clustering         = DISABLE_CLUSTERING,
1097         .emulated               = 1,
1098         .proc_name              = "ide-scsi",
1099 };
1100
1101 static int ide_scsi_probe(struct device *dev)
1102 {
1103         ide_drive_t *drive = to_ide_device(dev);
1104         idescsi_scsi_t *idescsi;
1105         struct Scsi_Host *host;
1106         struct gendisk *g;
1107         static int warned;
1108         int err = -ENOMEM;
1109
1110         if (!warned && drive->media == ide_cdrom) {
1111                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1112                 warned = 1;
1113         }
1114
1115         if (!strstr("ide-scsi", drive->driver_req) ||
1116             !drive->present ||
1117             drive->media == ide_disk ||
1118             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1119                 return -ENODEV;
1120
1121         g = alloc_disk(1 << PARTN_BITS);
1122         if (!g)
1123                 goto out_host_put;
1124
1125         ide_init_disk(g, drive);
1126
1127         host->max_id = 1;
1128
1129 #if IDESCSI_DEBUG_LOG
1130         if (drive->id->last_lun)
1131                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1132 #endif
1133         if ((drive->id->last_lun & 0x7) != 7)
1134                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1135         else
1136                 host->max_lun = 1;
1137
1138         drive->driver_data = host;
1139         idescsi = scsihost_to_idescsi(host);
1140         idescsi->drive = drive;
1141         idescsi->driver = &idescsi_driver;
1142         idescsi->host = host;
1143         idescsi->disk = g;
1144         g->private_data = &idescsi->driver;
1145         ide_register_subdriver(drive, &idescsi_driver);
1146         err = 0;
1147         idescsi_setup(drive, idescsi);
1148         g->fops = &idescsi_ops;
1149         ide_register_region(g);
1150         err = scsi_add_host(host, &drive->gendev);
1151         if (!err) {
1152                 scsi_scan_host(host);
1153                 return 0;
1154         }
1155         /* fall through on error */
1156         ide_unregister_region(g);
1157         ide_unregister_subdriver(drive, &idescsi_driver);
1158
1159         put_disk(g);
1160 out_host_put:
1161         scsi_host_put(host);
1162         return err;
1163 }
1164
1165 static int __init init_idescsi_module(void)
1166 {
1167         return driver_register(&idescsi_driver.gen_driver);
1168 }
1169
1170 static void __exit exit_idescsi_module(void)
1171 {
1172         driver_unregister(&idescsi_driver.gen_driver);
1173 }
1174
1175 module_init(init_idescsi_module);
1176 module_exit(exit_idescsi_module);
1177 MODULE_LICENSE("GPL");