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   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/types.h>
  38 #include <linux/string.h>
  39 #include <linux/kernel.h>
  40 #include <linux/mm.h>
  41 #include <linux/ioport.h>
  42 #include <linux/blkdev.h>
  43 #include <linux/errno.h>
  44 #include <linux/hdreg.h>
  45 #include <linux/slab.h>
  46 #include <linux/ide.h>
  47 #include <linux/scatterlist.h>
  48 #include <linux/delay.h>
  49 #include <linux/mutex.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 DEFINE_MUTEX(idescsi_ref_mutex);
 113 static int idescsi_nocd;                        /* Set by module param to skip cd */
 114
 115 #define ide_scsi_g(disk) \
 116         container_of((disk)->private_data, struct ide_scsi_obj, driver)
 117
 118 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
 119 {
 120         struct ide_scsi_obj *scsi = NULL;
 121
 122         mutex_lock(&idescsi_ref_mutex);
 123         scsi = ide_scsi_g(disk);
 124         if (scsi)
 125                 scsi_host_get(scsi->host);
 126         mutex_unlock(&idescsi_ref_mutex);
 127         return scsi;
 128 }
 129
 130 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 131 {
 132         mutex_lock(&idescsi_ref_mutex);
 133         scsi_host_put(scsi->host);
 134         mutex_unlock(&idescsi_ref_mutex);
 135 }
 136
 137 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 138 {
 139         return (idescsi_scsi_t*) (&host[1]);
 140 }
 141
 142 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 143 {
 144         return scsihost_to_idescsi(ide_drive->driver_data);
 145 }
 146
 147 /*
 148  *      Per ATAPI device status bits.
 149  */
 150 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
 151
 152 /*
 153  *      ide-scsi requests.
 154  */
 155 #define IDESCSI_PC_RQ                   90
 156
 157 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
 158 {
 159         while (bcount--)
 160                 (void) HWIF(drive)->INB(IDE_DATA_REG);
 161 }
 162
 163 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
 164 {
 165         while (bcount--)
 166                 HWIF(drive)->OUTB(0, IDE_DATA_REG);
 167 }
 168
 169 /*
 170  *      PIO data transfer routines using the scatter gather table.
 171  */
 172 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 173 {
 174         int count;
 175         char *buf;
 176
 177         while (bcount) {
 178                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 179                         printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
 180                         idescsi_discard_data (drive, bcount);
 181                         return;
 182                 }
 183                 count = min(pc->sg->length - pc->b_count, bcount);
 184                 if (PageHighMem(pc->sg->page)) {
 185                         unsigned long flags;
 186
 187                         local_irq_save(flags);
 188                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
 189                                         pc->sg->offset;
 190                         drive->hwif->atapi_input_bytes(drive,
 191                                                 buf + pc->b_count, count);
 192                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 193                         local_irq_restore(flags);
 194                 } else {
 195                         buf = page_address(pc->sg->page) + pc->sg->offset;
 196                         drive->hwif->atapi_input_bytes(drive,
 197                                                 buf + pc->b_count, count);
 198                 }
 199                 bcount -= count; pc->b_count += count;
 200                 if (pc->b_count == pc->sg->length) {
 201                         pc->sg++;
 202                         pc->b_count = 0;
 203                 }
 204         }
 205 }
 206
 207 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 208 {
 209         int count;
 210         char *buf;
 211
 212         while (bcount) {
 213                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 214                         printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
 215                         idescsi_output_zeros (drive, bcount);
 216                         return;
 217                 }
 218                 count = min(pc->sg->length - pc->b_count, bcount);
 219                 if (PageHighMem(pc->sg->page)) {
 220                         unsigned long flags;
 221
 222                         local_irq_save(flags);
 223                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
 224                                                 pc->sg->offset;
 225                         drive->hwif->atapi_output_bytes(drive,
 226                                                 buf + pc->b_count, count);
 227                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 228                         local_irq_restore(flags);
 229                 } else {
 230                         buf = page_address(pc->sg->page) + pc->sg->offset;
 231                         drive->hwif->atapi_output_bytes(drive,
 232                                                 buf + pc->b_count, count);
 233                 }
 234                 bcount -= count; pc->b_count += count;
 235                 if (pc->b_count == pc->sg->length) {
 236                         pc->sg++;
 237                         pc->b_count = 0;
 238                 }
 239         }
 240 }
 241
 242 /*
 243  *      Most of the SCSI commands are supported directly by ATAPI devices.
 244  *      idescsi_transform_pc handles the few exceptions.
 245  */
 246 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
 247 {
 248         u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
 249         char *atapi_buf;
 250
 251         if (!test_bit(PC_TRANSFORM, &pc->flags))
 252                 return;
 253         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 254                 if (c[0] == READ_6 || c[0] == WRITE_6) {
 255                         c[8] = c[4];            c[5] = c[3];            c[4] = c[2];
 256                         c[3] = c[1] & 0x1f;     c[2] = 0;               c[1] &= 0xe0;
 257                         c[0] += (READ_10 - READ_6);
 258                 }
 259                 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
 260                         unsigned short new_len;
 261                         if (!scsi_buf)
 262                                 return;
 263                         if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
 264                                 return;
 265                         memset(atapi_buf, 0, pc->buffer_size + 4);
 266                         memset (c, 0, 12);
 267                         c[0] = sc[0] | 0x40;
 268                         c[1] = sc[1];
 269                         c[2] = sc[2];
 270                         new_len = sc[4] + 4;
 271                         c[8] = new_len;
 272                         c[7] = new_len >> 8;
 273                         c[9] = sc[5];
 274                         if (c[0] == MODE_SELECT_10) {
 275                                 atapi_buf[1] = scsi_buf[0];     /* Mode data length */
 276                                 atapi_buf[2] = scsi_buf[1];     /* Medium type */
 277                                 atapi_buf[3] = scsi_buf[2];     /* Device specific parameter */
 278                                 atapi_buf[7] = scsi_buf[3];     /* Block descriptor length */
 279                                 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
 280                         }
 281                         pc->buffer = atapi_buf;
 282                         pc->request_transfer += 4;
 283                         pc->buffer_size += 4;
 284                 }
 285         }
 286 }
 287
 288 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
 289 {
 290         u8 *atapi_buf = pc->buffer;
 291         u8 *sc = pc->scsi_cmd->cmnd;
 292         u8 *scsi_buf = pc->scsi_cmd->request_buffer;
 293
 294         if (!test_bit(PC_TRANSFORM, &pc->flags))
 295                 return;
 296         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 297                 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
 298                         scsi_buf[0] = atapi_buf[1];             /* Mode data length */
 299                         scsi_buf[1] = atapi_buf[2];             /* Medium type */
 300                         scsi_buf[2] = atapi_buf[3];             /* Device specific parameter */
 301                         scsi_buf[3] = atapi_buf[7];             /* Block descriptor length */
 302                         memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
 303                 }
 304                 if (pc->c[0] == INQUIRY) {
 305                         scsi_buf[2] |= 2;                       /* ansi_revision */
 306                         scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
 307                 }
 308         }
 309         if (atapi_buf && atapi_buf != scsi_buf)
 310                 kfree(atapi_buf);
 311 }
 312
 313 static void hexdump(u8 *x, int len)
 314 {
 315         int i;
 316
 317         printk("[ ");
 318         for (i = 0; i < len; i++)
 319                 printk("%x ", x[i]);
 320         printk("]\n");
 321 }
 322
 323 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
 324 {
 325         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 326         idescsi_pc_t   *pc;
 327         struct request *rq;
 328         u8             *buf;
 329
 330         /* stuff a sense request in front of our current request */
 331         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 332         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 333         buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 334         if (pc == NULL || rq == NULL || buf == NULL) {
 335                 kfree(buf);
 336                 kfree(rq);
 337                 kfree(pc);
 338                 return -ENOMEM;
 339         }
 340         memset (pc, 0, sizeof (idescsi_pc_t));
 341         memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
 342         ide_init_drive_cmd(rq);
 343         rq->special = (char *) pc;
 344         pc->rq = rq;
 345         pc->buffer = buf;
 346         pc->c[0] = REQUEST_SENSE;
 347         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
 348         rq->cmd_type = REQ_TYPE_SENSE;
 349         pc->timeout = jiffies + WAIT_READY;
 350         /* NOTE! Save the failed packet command in "rq->buffer" */
 351         rq->buffer = (void *) failed_command->special;
 352         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
 353         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 354                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 355                 hexdump(pc->c, 6);
 356         }
 357         rq->rq_disk = scsi->disk;
 358         return ide_do_drive_cmd(drive, rq, ide_preempt);
 359 }
 360
 361 static int idescsi_end_request(ide_drive_t *, int, int);
 362
 363 static ide_startstop_t
 364 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 365 {
 366         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
 367                 /* force an abort */
 368                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
 369
 370         rq->errors++;
 371
 372         idescsi_end_request(drive, 0, 0);
 373
 374         return ide_stopped;
 375 }
 376
 377 static ide_startstop_t
 378 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 379 {
 380 #if IDESCSI_DEBUG_LOG
 381         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
 382                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
 383 #endif
 384         rq->errors |= ERROR_MAX;
 385
 386         idescsi_end_request(drive, 0, 0);
 387
 388         return ide_stopped;
 389 }
 390
 391 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 392 {
 393         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 394         struct request *rq = HWGROUP(drive)->rq;
 395         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
 396         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 397         struct Scsi_Host *host;
 398         u8 *scsi_buf;
 399         int errors = rq->errors;
 400         unsigned long flags;
 401
 402         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
 403                 ide_end_request(drive, uptodate, nrsecs);
 404                 return 0;
 405         }
 406         ide_end_drive_cmd (drive, 0, 0);
 407         if (blk_sense_request(rq)) {
 408                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
 409                 if (log) {
 410                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 411                         hexdump(pc->buffer,16);
 412                 }
 413                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
 414                 kfree(pc->buffer);
 415                 kfree(pc);
 416                 kfree(rq);
 417                 pc = opc;
 418                 rq = pc->rq;
 419                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 420                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
 421         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
 422                 if (log)
 423                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 424                                         drive->name, pc->scsi_cmd->serial_number);
 425                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 426         } else if (errors >= ERROR_MAX) {
 427                 pc->scsi_cmd->result = DID_ERROR << 16;
 428                 if (log)
 429                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 430         } else if (errors) {
 431                 if (log)
 432                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 433                 if (!idescsi_check_condition(drive, rq))
 434                         /* we started a request sense, so we'll be back, exit for now */
 435                         return 0;
 436                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 437         } else {
 438                 pc->scsi_cmd->result = DID_OK << 16;
 439                 idescsi_transform_pc2 (drive, pc);
 440                 if (log) {
 441                         printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
 442                         if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
 443                                 printk(", rst = ");
 444                                 scsi_buf = pc->scsi_cmd->request_buffer;
 445                                 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
 446                         } else printk("\n");
 447                 }
 448         }
 449         host = pc->scsi_cmd->device->host;
 450         spin_lock_irqsave(host->host_lock, flags);
 451         pc->done(pc->scsi_cmd);
 452         spin_unlock_irqrestore(host->host_lock, flags);
 453         kfree(pc);
 454         kfree(rq);
 455         scsi->pc = NULL;
 456         return 0;
 457 }
 458
 459 static inline unsigned long get_timeout(idescsi_pc_t *pc)
 460 {
 461         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 462 }
 463
 464 static int idescsi_expiry(ide_drive_t *drive)
 465 {
 466         idescsi_scsi_t *scsi = drive->driver_data;
 467         idescsi_pc_t   *pc   = scsi->pc;
 468
 469 #if IDESCSI_DEBUG_LOG
 470         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
 471 #endif
 472         set_bit(PC_TIMEDOUT, &pc->flags);
 473
 474         return 0;                                       /* we do not want the ide subsystem to retry */
 475 }
 476
 477 /*
 478  *      Our interrupt handler.
 479  */
 480 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 481 {
 482         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 483         idescsi_pc_t *pc=scsi->pc;
 484         struct request *rq = pc->rq;
 485         atapi_bcount_t bcount;
 486         atapi_status_t status;
 487         atapi_ireason_t ireason;
 488         atapi_feature_t feature;
 489
 490         unsigned int temp;
 491
 492 #if IDESCSI_DEBUG_LOG
 493         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
 494 #endif /* IDESCSI_DEBUG_LOG */
 495
 496         if (test_bit(PC_TIMEDOUT, &pc->flags)){
 497 #if IDESCSI_DEBUG_LOG
 498                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
 499                                 pc->scsi_cmd->serial_number, jiffies);
 500 #endif
 501                 /* end this request now - scsi should retry it*/
 502                 idescsi_end_request (drive, 1, 0);
 503                 return ide_stopped;
 504         }
 505         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
 506 #if IDESCSI_DEBUG_LOG
 507                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
 508 #endif /* IDESCSI_DEBUG_LOG */
 509                 pc->actually_transferred=pc->request_transfer;
 510                 (void) HWIF(drive)->ide_dma_end(drive);
 511         }
 512
 513         feature.all = 0;
 514         /* Clear the interrupt */
 515         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
 516
 517         if (!status.b.drq) {
 518                 /* No more interrupts */
 519                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 520                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
 521                 local_irq_enable_in_hardirq();
 522                 if (status.b.check)
 523                         rq->errors++;
 524                 idescsi_end_request (drive, 1, 0);
 525                 return ide_stopped;
 526         }
 527         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
 528         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
 529         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 530
 531         if (ireason.b.cod) {
 532                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
 533                 return ide_do_reset (drive);
 534         }
 535         if (ireason.b.io) {
 536                 temp = pc->actually_transferred + bcount.all;
 537                 if (temp > pc->request_transfer) {
 538                         if (temp > pc->buffer_size) {
 539                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
 540                                         "send us more data than expected "
 541                                         "- discarding data\n");
 542                                 temp = pc->buffer_size - pc->actually_transferred;
 543                                 if (temp) {
 544                                         clear_bit(PC_WRITING, &pc->flags);
 545                                         if (pc->sg)
 546                                                 idescsi_input_buffers(drive, pc, temp);
 547                                         else
 548                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
 549                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
 550                                 }
 551                                 pc->actually_transferred += temp;
 552                                 pc->current_position += temp;
 553                                 idescsi_discard_data(drive, bcount.all - temp);
 554                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 555                                 return ide_started;
 556                         }
 557 #if IDESCSI_DEBUG_LOG
 558                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
 559 #endif /* IDESCSI_DEBUG_LOG */
 560                 }
 561         }
 562         if (ireason.b.io) {
 563                 clear_bit(PC_WRITING, &pc->flags);
 564                 if (pc->sg)
 565                         idescsi_input_buffers(drive, pc, bcount.all);
 566                 else
 567                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
 568         } else {
 569                 set_bit(PC_WRITING, &pc->flags);
 570                 if (pc->sg)
 571                         idescsi_output_buffers (drive, pc, bcount.all);
 572                 else
 573                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
 574         }
 575         /* Update the current position */
 576         pc->actually_transferred += bcount.all;
 577         pc->current_position += bcount.all;
 578
 579         /* And set the interrupt handler again */
 580         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 581         return ide_started;
 582 }
 583
 584 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 585 {
 586         ide_hwif_t *hwif = drive->hwif;
 587         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 588         idescsi_pc_t *pc = scsi->pc;
 589         atapi_ireason_t ireason;
 590         ide_startstop_t startstop;
 591
 592         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
 593                 printk(KERN_ERR "ide-scsi: Strange, packet command "
 594                         "initiated yet DRQ isn't asserted\n");
 595                 return startstop;
 596         }
 597         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 598         if (!ireason.b.cod || ireason.b.io) {
 599                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
 600                                 "issuing a packet command\n");
 601                 return ide_do_reset (drive);
 602         }
 603         BUG_ON(HWGROUP(drive)->handler != NULL);
 604         /* Set the interrupt routine */
 605         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 606         /* Send the actual packet */
 607         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
 608         if (test_bit (PC_DMA_OK, &pc->flags)) {
 609                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
 610                 hwif->dma_start(drive);
 611         }
 612         return ide_started;
 613 }
 614
 615 static inline int idescsi_set_direction(idescsi_pc_t *pc)
 616 {
 617         switch (pc->c[0]) {
 618                 case READ_6: case READ_10: case READ_12:
 619                         clear_bit(PC_WRITING, &pc->flags);
 620                         return 0;
 621                 case WRITE_6: case WRITE_10: case WRITE_12:
 622                         set_bit(PC_WRITING, &pc->flags);
 623                         return 0;
 624                 default:
 625                         return 1;
 626         }
 627 }
 628
 629 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
 630 {
 631         ide_hwif_t *hwif = drive->hwif;
 632         struct scatterlist *sg, *scsi_sg;
 633         int segments;
 634
 635         if (!pc->request_transfer || pc->request_transfer % 1024)
 636                 return 1;
 637
 638         if (idescsi_set_direction(pc))
 639                 return 1;
 640
 641         sg = hwif->sg_table;
 642         scsi_sg = pc->scsi_cmd->request_buffer;
 643         segments = pc->scsi_cmd->use_sg;
 644
 645         if (segments > hwif->sg_max_nents)
 646                 return 1;
 647
 648         if (!segments) {
 649                 hwif->sg_nents = 1;
 650                 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
 651         } else {
 652                 hwif->sg_nents = segments;
 653                 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 654         }
 655
 656         return 0;
 657 }
 658
 659 /*
 660  *      Issue a packet command
 661  */
 662 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
 663 {
 664         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 665         ide_hwif_t *hwif = drive->hwif;
 666         atapi_feature_t feature;
 667         atapi_bcount_t bcount;
 668
 669         scsi->pc=pc;                                                    /* Set the current packet command */
 670         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
 671         pc->current_position=pc->buffer;
 672         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
 673
 674         feature.all = 0;
 675         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
 676                 hwif->sg_mapped = 1;
 677                 feature.b.dma = !hwif->dma_setup(drive);
 678                 hwif->sg_mapped = 0;
 679         }
 680
 681         SELECT_DRIVE(drive);
 682         if (IDE_CONTROL_REG)
 683                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
 684
 685         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
 686         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
 687         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
 688
 689         if (feature.b.dma)
 690                 set_bit(PC_DMA_OK, &pc->flags);
 691
 692         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
 693                 BUG_ON(HWGROUP(drive)->handler != NULL);
 694                 ide_set_handler(drive, &idescsi_transfer_pc,
 695                                 get_timeout(pc), idescsi_expiry);
 696                 /* Issue the packet command */
 697                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 698                 return ide_started;
 699         } else {
 700                 /* Issue the packet command */
 701                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 702                 return idescsi_transfer_pc(drive);
 703         }
 704 }
 705
 706 /*
 707  *      idescsi_do_request is our request handling function.
 708  */
 709 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 710 {
 711 #if IDESCSI_DEBUG_LOG
 712         printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
 713         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
 714 #endif /* IDESCSI_DEBUG_LOG */
 715
 716         if (blk_sense_request(rq) || blk_special_request(rq)) {
 717                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
 718         }
 719         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 720         idescsi_end_request (drive, 0, 0);
 721         return ide_stopped;
 722 }
 723
 724 static void idescsi_add_settings(ide_drive_t *drive)
 725 {
 726         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 727
 728 /*
 729  *                      drive   setting name    read/write      ioctl   ioctl           data type       min     max     mul_factor      div_factor      data pointer            set function
 730  */
 731         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 732         ide_add_setting(drive,  "bios_head",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 733         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 734         ide_add_setting(drive,  "transform",    SETTING_RW,     -1,     -1,             TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 735         ide_add_setting(drive,  "log",          SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 736 }
 737
 738 /*
 739  *      Driver initialization.
 740  */
 741 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 742 {
 743         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 744                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 745         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
 746         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 747 #if IDESCSI_DEBUG_LOG
 748         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 749 #endif /* IDESCSI_DEBUG_LOG */
 750         idescsi_add_settings(drive);
 751 }
 752
 753 static void ide_scsi_remove(ide_drive_t *drive)
 754 {
 755         struct Scsi_Host *scsihost = drive->driver_data;
 756         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 757         struct gendisk *g = scsi->disk;
 758
 759         ide_unregister_subdriver(drive, scsi->driver);
 760
 761         ide_unregister_region(g);
 762
 763         drive->driver_data = NULL;
 764         g->private_data = NULL;
 765         put_disk(g);
 766
 767         scsi_remove_host(scsihost);
 768         ide_scsi_put(scsi);
 769 }
 770
 771 static int ide_scsi_probe(ide_drive_t *);
 772
 773 #ifdef CONFIG_PROC_FS
 774 static ide_proc_entry_t idescsi_proc[] = {
 775         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 776         { NULL, 0, NULL, NULL }
 777 };
 778 #else
 779 # define idescsi_proc   NULL
 780 #endif
 781
 782 static ide_driver_t idescsi_driver = {
 783         .gen_driver = {
 784                 .owner          = THIS_MODULE,
 785                 .name           = "ide-scsi",
 786                 .bus            = &ide_bus_type,
 787         },
 788         .probe                  = ide_scsi_probe,
 789         .remove                 = ide_scsi_remove,
 790         .version                = IDESCSI_VERSION,
 791         .media                  = ide_scsi,
 792         .supports_dsc_overlap   = 0,
 793         .proc                   = idescsi_proc,
 794         .do_request             = idescsi_do_request,
 795         .end_request            = idescsi_end_request,
 796         .error                  = idescsi_atapi_error,
 797         .abort                  = idescsi_atapi_abort,
 798 };
 799
 800 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 801 {
 802         struct gendisk *disk = inode->i_bdev->bd_disk;
 803         struct ide_scsi_obj *scsi;
 804
 805         if (!(scsi = ide_scsi_get(disk)))
 806                 return -ENXIO;
 807
 808         return 0;
 809 }
 810
 811 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 812 {
 813         struct gendisk *disk = inode->i_bdev->bd_disk;
 814         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 815
 816         ide_scsi_put(scsi);
 817
 818         return 0;
 819 }
 820
 821 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 822                         unsigned int cmd, unsigned long arg)
 823 {
 824         struct block_device *bdev = inode->i_bdev;
 825         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 826         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 827 }
 828
 829 static struct block_device_operations idescsi_ops = {
 830         .owner          = THIS_MODULE,
 831         .open           = idescsi_ide_open,
 832         .release        = idescsi_ide_release,
 833         .ioctl          = idescsi_ide_ioctl,
 834 };
 835
 836 static int idescsi_slave_configure(struct scsi_device * sdp)
 837 {
 838         /* Configure detected device */
 839         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 840         return 0;
 841 }
 842
 843 static const char *idescsi_info (struct Scsi_Host *host)
 844 {
 845         return "SCSI host adapter emulation for IDE ATAPI devices";
 846 }
 847
 848 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 849 {
 850         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 851
 852         if (cmd == SG_SET_TRANSFORM) {
 853                 if (arg)
 854                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 855                 else
 856                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 857                 return 0;
 858         } else if (cmd == SG_GET_TRANSFORM)
 859                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 860         return -EINVAL;
 861 }
 862
 863 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
 864 {
 865         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 866
 867         /* this was a layering violation and we can't support it
 868            anymore, sorry. */
 869 #if 0
 870         struct gendisk *disk = cmd->request->rq_disk;
 871
 872         if (disk) {
 873                 struct struct scsi_device_Template **p = disk->private_data;
 874                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
 875                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 876         }
 877 #endif
 878         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
 879 }
 880
 881 static int idescsi_queue (struct scsi_cmnd *cmd,
 882                 void (*done)(struct scsi_cmnd *))
 883 {
 884         struct Scsi_Host *host = cmd->device->host;
 885         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 886         ide_drive_t *drive = scsi->drive;
 887         struct request *rq = NULL;
 888         idescsi_pc_t *pc = NULL;
 889
 890         if (!drive) {
 891                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 892                 goto abort;
 893         }
 894         scsi = drive_to_idescsi(drive);
 895         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 896         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 897         if (rq == NULL || pc == NULL) {
 898                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 899                 goto abort;
 900         }
 901
 902         memset (pc->c, 0, 12);
 903         pc->flags = 0;
 904         pc->rq = rq;
 905         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 906         if (cmd->use_sg) {
 907                 pc->buffer = NULL;
 908                 pc->sg = cmd->request_buffer;
 909         } else {
 910                 pc->buffer = cmd->request_buffer;
 911                 pc->sg = NULL;
 912         }
 913         pc->b_count = 0;
 914         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
 915         pc->scsi_cmd = cmd;
 916         pc->done = done;
 917         pc->timeout = jiffies + cmd->timeout_per_command;
 918
 919         if (should_transform(drive, cmd))
 920                 set_bit(PC_TRANSFORM, &pc->flags);
 921         idescsi_transform_pc1 (drive, pc);
 922
 923         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 924                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 925                 hexdump(cmd->cmnd, cmd->cmd_len);
 926                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 927                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 928                         hexdump(pc->c, 12);
 929                 }
 930         }
 931
 932         ide_init_drive_cmd (rq);
 933         rq->special = (char *) pc;
 934         rq->cmd_type = REQ_TYPE_SPECIAL;
 935         spin_unlock_irq(host->host_lock);
 936         rq->rq_disk = scsi->disk;
 937         (void) ide_do_drive_cmd (drive, rq, ide_end);
 938         spin_lock_irq(host->host_lock);
 939         return 0;
 940 abort:
 941         kfree (pc);
 942         kfree (rq);
 943         cmd->result = DID_ERROR << 16;
 944         done(cmd);
 945         return 0;
 946 }
 947
 948 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 949 {
 950         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 951         ide_drive_t    *drive = scsi->drive;
 952         int             busy;
 953         int             ret   = FAILED;
 954
 955         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 956
 957         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 958                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 959
 960         if (!drive) {
 961                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 962                 WARN_ON(1);
 963                 goto no_drive;
 964         }
 965
 966         /* First give it some more time, how much is "right" is hard to say :-( */
 967
 968         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 969         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 970                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 971
 972         spin_lock_irq(&ide_lock);
 973
 974         /* If there is no pc running we're done (our interrupt took care of it) */
 975         if (!scsi->pc) {
 976                 ret = SUCCESS;
 977                 goto ide_unlock;
 978         }
 979
 980         /* It's somewhere in flight. Does ide subsystem agree? */
 981         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 982             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 983                 /*
 984                  * FIXME - not sure this condition can ever occur
 985                  */
 986                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 987
 988                 if (blk_sense_request(scsi->pc->rq))
 989                         kfree(scsi->pc->buffer);
 990                 kfree(scsi->pc->rq);
 991                 kfree(scsi->pc);
 992                 scsi->pc = NULL;
 993
 994                 ret = SUCCESS;
 995         }
 996
 997 ide_unlock:
 998         spin_unlock_irq(&ide_lock);
 999 no_drive:
1000         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1001                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
1002
1003         return ret;
1004 }
1005
1006 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
1007 {
1008         struct request *req;
1009         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
1010         ide_drive_t    *drive = scsi->drive;
1011         int             ready = 0;
1012         int             ret   = SUCCESS;
1013
1014         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1015
1016         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1017                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1018
1019         if (!drive) {
1020                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1021                 WARN_ON(1);
1022                 return FAILED;
1023         }
1024
1025         spin_lock_irq(cmd->device->host->host_lock);
1026         spin_lock(&ide_lock);
1027
1028         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1029                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1030                 spin_unlock(&ide_lock);
1031                 spin_unlock_irq(cmd->device->host->host_lock);
1032                 return FAILED;
1033         }
1034
1035         /* kill current request */
1036         blkdev_dequeue_request(req);
1037         end_that_request_last(req, 0);
1038         if (blk_sense_request(req))
1039                 kfree(scsi->pc->buffer);
1040         kfree(scsi->pc);
1041         scsi->pc = NULL;
1042         kfree(req);
1043
1044         /* now nuke the drive queue */
1045         while ((req = elv_next_request(drive->queue))) {
1046                 blkdev_dequeue_request(req);
1047                 end_that_request_last(req, 0);
1048         }
1049
1050         HWGROUP(drive)->rq = NULL;
1051         HWGROUP(drive)->handler = NULL;
1052         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
1053         spin_unlock(&ide_lock);
1054
1055         ide_do_reset(drive);
1056
1057         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1058
1059         do {
1060                 spin_unlock_irq(cmd->device->host->host_lock);
1061                 msleep(50);
1062                 spin_lock_irq(cmd->device->host->host_lock);
1063         } while ( HWGROUP(drive)->handler );
1064
1065         ready = drive_is_ready(drive);
1066         HWGROUP(drive)->busy--;
1067         if (!ready) {
1068                 printk (KERN_ERR "ide-scsi: reset failed!\n");
1069                 ret = FAILED;
1070         }
1071
1072         spin_unlock_irq(cmd->device->host->host_lock);
1073         return ret;
1074 }
1075
1076 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1077                 sector_t capacity, int *parm)
1078 {
1079         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1080         ide_drive_t *drive = idescsi->drive;
1081
1082         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1083                 parm[0] = drive->bios_head;
1084                 parm[1] = drive->bios_sect;
1085                 parm[2] = drive->bios_cyl;
1086         }
1087         return 0;
1088 }
1089
1090 static struct scsi_host_template idescsi_template = {
1091         .module                 = THIS_MODULE,
1092         .name                   = "idescsi",
1093         .info                   = idescsi_info,
1094         .slave_configure        = idescsi_slave_configure,
1095         .ioctl                  = idescsi_ioctl,
1096         .queuecommand           = idescsi_queue,
1097         .eh_abort_handler       = idescsi_eh_abort,
1098         .eh_host_reset_handler  = idescsi_eh_reset,
1099         .bios_param             = idescsi_bios,
1100         .can_queue              = 40,
1101         .this_id                = -1,
1102         .sg_tablesize           = 256,
1103         .cmd_per_lun            = 5,
1104         .max_sectors            = 128,
1105         .use_clustering         = DISABLE_CLUSTERING,
1106         .emulated               = 1,
1107         .proc_name              = "ide-scsi",
1108 };
1109
1110 static int ide_scsi_probe(ide_drive_t *drive)
1111 {
1112         idescsi_scsi_t *idescsi;
1113         struct Scsi_Host *host;
1114         struct gendisk *g;
1115         static int warned;
1116         int err = -ENOMEM;
1117
1118         if (!warned && drive->media == ide_cdrom) {
1119                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1120                 warned = 1;
1121         }
1122
1123         if (idescsi_nocd && drive->media == ide_cdrom)
1124                 return -ENODEV;
1125
1126         if (!strstr("ide-scsi", drive->driver_req) ||
1127             !drive->present ||
1128             drive->media == ide_disk ||
1129             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1130                 return -ENODEV;
1131
1132         g = alloc_disk(1 << PARTN_BITS);
1133         if (!g)
1134                 goto out_host_put;
1135
1136         ide_init_disk(g, drive);
1137
1138         host->max_id = 1;
1139
1140 #if IDESCSI_DEBUG_LOG
1141         if (drive->id->last_lun)
1142                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1143 #endif
1144         if ((drive->id->last_lun & 0x7) != 7)
1145                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1146         else
1147                 host->max_lun = 1;
1148
1149         drive->driver_data = host;
1150         idescsi = scsihost_to_idescsi(host);
1151         idescsi->drive = drive;
1152         idescsi->driver = &idescsi_driver;
1153         idescsi->host = host;
1154         idescsi->disk = g;
1155         g->private_data = &idescsi->driver;
1156         ide_register_subdriver(drive, &idescsi_driver);
1157         err = 0;
1158         idescsi_setup(drive, idescsi);
1159         g->fops = &idescsi_ops;
1160         ide_register_region(g);
1161         err = scsi_add_host(host, &drive->gendev);
1162         if (!err) {
1163                 scsi_scan_host(host);
1164                 return 0;
1165         }
1166         /* fall through on error */
1167         ide_unregister_region(g);
1168         ide_unregister_subdriver(drive, &idescsi_driver);
1169
1170         put_disk(g);
1171 out_host_put:
1172         scsi_host_put(host);
1173         return err;
1174 }
1175
1176 static int __init init_idescsi_module(void)
1177 {
1178         return driver_register(&idescsi_driver.gen_driver);
1179 }
1180
1181 static void __exit exit_idescsi_module(void)
1182 {
1183         driver_unregister(&idescsi_driver.gen_driver);
1184 }
1185
1186 module_param(idescsi_nocd, int, 0600);
1187 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1188 module_init(init_idescsi_module);
1189 module_exit(exit_idescsi_module);
1190 MODULE_LICENSE("GPL");