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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/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                 if (PageHighMem(pc->sg->page)) {
 184                         unsigned long flags;
 185
 186                         local_irq_save(flags);
 187                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
 188                                         pc->sg->offset;
 189                         drive->hwif->atapi_input_bytes(drive,
 190                                                 buf + pc->b_count, count);
 191                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 192                         local_irq_restore(flags);
 193                 } else {
 194                         buf = page_address(pc->sg->page) + pc->sg->offset;
 195                         drive->hwif->atapi_input_bytes(drive,
 196                                                 buf + pc->b_count, count);
 197                 }
 198                 bcount -= count; pc->b_count += count;
 199                 if (pc->b_count == pc->sg->length) {
 200                         pc->sg++;
 201                         pc->b_count = 0;
 202                 }
 203         }
 204 }
 205
 206 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 207 {
 208         int count;
 209         char *buf;
 210
 211         while (bcount) {
 212                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 213                         printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
 214                         idescsi_output_zeros (drive, bcount);
 215                         return;
 216                 }
 217                 count = min(pc->sg->length - pc->b_count, bcount);
 218                 if (PageHighMem(pc->sg->page)) {
 219                         unsigned long flags;
 220
 221                         local_irq_save(flags);
 222                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
 223                                                 pc->sg->offset;
 224                         drive->hwif->atapi_output_bytes(drive,
 225                                                 buf + pc->b_count, count);
 226                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 227                         local_irq_restore(flags);
 228                 } else {
 229                         buf = page_address(pc->sg->page) + pc->sg->offset;
 230                         drive->hwif->atapi_output_bytes(drive,
 231                                                 buf + pc->b_count, count);
 232                 }
 233                 bcount -= count; pc->b_count += count;
 234                 if (pc->b_count == pc->sg->length) {
 235                         pc->sg++;
 236                         pc->b_count = 0;
 237                 }
 238         }
 239 }
 240
 241 /*
 242  *      Most of the SCSI commands are supported directly by ATAPI devices.
 243  *      idescsi_transform_pc handles the few exceptions.
 244  */
 245 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
 246 {
 247         u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
 248         char *atapi_buf;
 249
 250         if (!test_bit(PC_TRANSFORM, &pc->flags))
 251                 return;
 252         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 253                 if (c[0] == READ_6 || c[0] == WRITE_6) {
 254                         c[8] = c[4];            c[5] = c[3];            c[4] = c[2];
 255                         c[3] = c[1] & 0x1f;     c[2] = 0;               c[1] &= 0xe0;
 256                         c[0] += (READ_10 - READ_6);
 257                 }
 258                 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
 259                         unsigned short new_len;
 260                         if (!scsi_buf)
 261                                 return;
 262                         if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
 263                                 return;
 264                         memset(atapi_buf, 0, pc->buffer_size + 4);
 265                         memset (c, 0, 12);
 266                         c[0] = sc[0] | 0x40;
 267                         c[1] = sc[1];
 268                         c[2] = sc[2];
 269                         new_len = sc[4] + 4;
 270                         c[8] = new_len;
 271                         c[7] = new_len >> 8;
 272                         c[9] = sc[5];
 273                         if (c[0] == MODE_SELECT_10) {
 274                                 atapi_buf[1] = scsi_buf[0];     /* Mode data length */
 275                                 atapi_buf[2] = scsi_buf[1];     /* Medium type */
 276                                 atapi_buf[3] = scsi_buf[2];     /* Device specific parameter */
 277                                 atapi_buf[7] = scsi_buf[3];     /* Block descriptor length */
 278                                 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
 279                         }
 280                         pc->buffer = atapi_buf;
 281                         pc->request_transfer += 4;
 282                         pc->buffer_size += 4;
 283                 }
 284         }
 285 }
 286
 287 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
 288 {
 289         u8 *atapi_buf = pc->buffer;
 290         u8 *sc = pc->scsi_cmd->cmnd;
 291         u8 *scsi_buf = pc->scsi_cmd->request_buffer;
 292
 293         if (!test_bit(PC_TRANSFORM, &pc->flags))
 294                 return;
 295         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 296                 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
 297                         scsi_buf[0] = atapi_buf[1];             /* Mode data length */
 298                         scsi_buf[1] = atapi_buf[2];             /* Medium type */
 299                         scsi_buf[2] = atapi_buf[3];             /* Device specific parameter */
 300                         scsi_buf[3] = atapi_buf[7];             /* Block descriptor length */
 301                         memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
 302                 }
 303                 if (pc->c[0] == INQUIRY) {
 304                         scsi_buf[2] |= 2;                       /* ansi_revision */
 305                         scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
 306                 }
 307         }
 308         if (atapi_buf && atapi_buf != scsi_buf)
 309                 kfree(atapi_buf);
 310 }
 311
 312 static void hexdump(u8 *x, int len)
 313 {
 314         int i;
 315
 316         printk("[ ");
 317         for (i = 0; i < len; i++)
 318                 printk("%x ", x[i]);
 319         printk("]\n");
 320 }
 321
 322 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
 323 {
 324         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 325         idescsi_pc_t   *pc;
 326         struct request *rq;
 327         u8             *buf;
 328
 329         /* stuff a sense request in front of our current request */
 330         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 331         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 332         buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 333         if (pc == NULL || rq == NULL || buf == NULL) {
 334                 kfree(buf);
 335                 kfree(rq);
 336                 kfree(pc);
 337                 return -ENOMEM;
 338         }
 339         memset (pc, 0, sizeof (idescsi_pc_t));
 340         memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
 341         ide_init_drive_cmd(rq);
 342         rq->special = (char *) pc;
 343         pc->rq = rq;
 344         pc->buffer = buf;
 345         pc->c[0] = REQUEST_SENSE;
 346         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
 347         rq->flags = REQ_SENSE;
 348         pc->timeout = jiffies + WAIT_READY;
 349         /* NOTE! Save the failed packet command in "rq->buffer" */
 350         rq->buffer = (void *) failed_command->special;
 351         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
 352         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 353                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 354                 hexdump(pc->c, 6);
 355         }
 356         rq->rq_disk = scsi->disk;
 357         return ide_do_drive_cmd(drive, rq, ide_preempt);
 358 }
 359
 360 static int idescsi_end_request(ide_drive_t *, int, int);
 361
 362 static ide_startstop_t
 363 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 364 {
 365         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
 366                 /* force an abort */
 367                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
 368
 369         rq->errors++;
 370
 371         idescsi_end_request(drive, 0, 0);
 372
 373         return ide_stopped;
 374 }
 375
 376 static ide_startstop_t
 377 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 378 {
 379 #if IDESCSI_DEBUG_LOG
 380         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
 381                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
 382 #endif
 383         rq->errors |= ERROR_MAX;
 384
 385         idescsi_end_request(drive, 0, 0);
 386
 387         return ide_stopped;
 388 }
 389
 390 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 391 {
 392         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 393         struct request *rq = HWGROUP(drive)->rq;
 394         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
 395         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 396         struct Scsi_Host *host;
 397         u8 *scsi_buf;
 398         int errors = rq->errors;
 399         unsigned long flags;
 400
 401         if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
 402                 ide_end_request(drive, uptodate, nrsecs);
 403                 return 0;
 404         }
 405         ide_end_drive_cmd (drive, 0, 0);
 406         if (rq->flags & REQ_SENSE) {
 407                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
 408                 if (log) {
 409                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 410                         hexdump(pc->buffer,16);
 411                 }
 412                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
 413                 kfree(pc->buffer);
 414                 kfree(pc);
 415                 kfree(rq);
 416                 pc = opc;
 417                 rq = pc->rq;
 418                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 419                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
 420         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
 421                 if (log)
 422                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 423                                         drive->name, pc->scsi_cmd->serial_number);
 424                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 425         } else if (errors >= ERROR_MAX) {
 426                 pc->scsi_cmd->result = DID_ERROR << 16;
 427                 if (log)
 428                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 429         } else if (errors) {
 430                 if (log)
 431                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 432                 if (!idescsi_check_condition(drive, rq))
 433                         /* we started a request sense, so we'll be back, exit for now */
 434                         return 0;
 435                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 436         } else {
 437                 pc->scsi_cmd->result = DID_OK << 16;
 438                 idescsi_transform_pc2 (drive, pc);
 439                 if (log) {
 440                         printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
 441                         if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
 442                                 printk(", rst = ");
 443                                 scsi_buf = pc->scsi_cmd->request_buffer;
 444                                 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
 445                         } else printk("\n");
 446                 }
 447         }
 448         host = pc->scsi_cmd->device->host;
 449         spin_lock_irqsave(host->host_lock, flags);
 450         pc->done(pc->scsi_cmd);
 451         spin_unlock_irqrestore(host->host_lock, flags);
 452         kfree(pc);
 453         kfree(rq);
 454         scsi->pc = NULL;
 455         return 0;
 456 }
 457
 458 static inline unsigned long get_timeout(idescsi_pc_t *pc)
 459 {
 460         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 461 }
 462
 463 static int idescsi_expiry(ide_drive_t *drive)
 464 {
 465         idescsi_scsi_t *scsi = drive->driver_data;
 466         idescsi_pc_t   *pc   = scsi->pc;
 467
 468 #if IDESCSI_DEBUG_LOG
 469         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
 470 #endif
 471         set_bit(PC_TIMEDOUT, &pc->flags);
 472
 473         return 0;                                       /* we do not want the ide subsystem to retry */
 474 }
 475
 476 /*
 477  *      Our interrupt handler.
 478  */
 479 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 480 {
 481         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 482         idescsi_pc_t *pc=scsi->pc;
 483         struct request *rq = pc->rq;
 484         atapi_bcount_t bcount;
 485         atapi_status_t status;
 486         atapi_ireason_t ireason;
 487         atapi_feature_t feature;
 488
 489         unsigned int temp;
 490
 491 #if IDESCSI_DEBUG_LOG
 492         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
 493 #endif /* IDESCSI_DEBUG_LOG */
 494
 495         if (test_bit(PC_TIMEDOUT, &pc->flags)){
 496 #if IDESCSI_DEBUG_LOG
 497                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
 498                                 pc->scsi_cmd->serial_number, jiffies);
 499 #endif
 500                 /* end this request now - scsi should retry it*/
 501                 idescsi_end_request (drive, 1, 0);
 502                 return ide_stopped;
 503         }
 504         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
 505 #if IDESCSI_DEBUG_LOG
 506                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
 507 #endif /* IDESCSI_DEBUG_LOG */
 508                 pc->actually_transferred=pc->request_transfer;
 509                 (void) HWIF(drive)->ide_dma_end(drive);
 510         }
 511
 512         feature.all = 0;
 513         /* Clear the interrupt */
 514         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
 515
 516         if (!status.b.drq) {
 517                 /* No more interrupts */
 518                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 519                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
 520                 local_irq_enable();
 521                 if (status.b.check)
 522                         rq->errors++;
 523                 idescsi_end_request (drive, 1, 0);
 524                 return ide_stopped;
 525         }
 526         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
 527         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
 528         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 529
 530         if (ireason.b.cod) {
 531                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
 532                 return ide_do_reset (drive);
 533         }
 534         if (ireason.b.io) {
 535                 temp = pc->actually_transferred + bcount.all;
 536                 if (temp > pc->request_transfer) {
 537                         if (temp > pc->buffer_size) {
 538                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
 539                                         "send us more data than expected "
 540                                         "- discarding data\n");
 541                                 temp = pc->buffer_size - pc->actually_transferred;
 542                                 if (temp) {
 543                                         clear_bit(PC_WRITING, &pc->flags);
 544                                         if (pc->sg)
 545                                                 idescsi_input_buffers(drive, pc, temp);
 546                                         else
 547                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
 548                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
 549                                 }
 550                                 pc->actually_transferred += temp;
 551                                 pc->current_position += temp;
 552                                 idescsi_discard_data(drive, bcount.all - temp);
 553                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 554                                 return ide_started;
 555                         }
 556 #if IDESCSI_DEBUG_LOG
 557                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
 558 #endif /* IDESCSI_DEBUG_LOG */
 559                 }
 560         }
 561         if (ireason.b.io) {
 562                 clear_bit(PC_WRITING, &pc->flags);
 563                 if (pc->sg)
 564                         idescsi_input_buffers(drive, pc, bcount.all);
 565                 else
 566                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
 567         } else {
 568                 set_bit(PC_WRITING, &pc->flags);
 569                 if (pc->sg)
 570                         idescsi_output_buffers (drive, pc, bcount.all);
 571                 else
 572                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
 573         }
 574         /* Update the current position */
 575         pc->actually_transferred += bcount.all;
 576         pc->current_position += bcount.all;
 577
 578         /* And set the interrupt handler again */
 579         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 580         return ide_started;
 581 }
 582
 583 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 584 {
 585         ide_hwif_t *hwif = drive->hwif;
 586         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 587         idescsi_pc_t *pc = scsi->pc;
 588         atapi_ireason_t ireason;
 589         ide_startstop_t startstop;
 590
 591         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
 592                 printk(KERN_ERR "ide-scsi: Strange, packet command "
 593                         "initiated yet DRQ isn't asserted\n");
 594                 return startstop;
 595         }
 596         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 597         if (!ireason.b.cod || ireason.b.io) {
 598                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
 599                                 "issuing a packet command\n");
 600                 return ide_do_reset (drive);
 601         }
 602         if (HWGROUP(drive)->handler != NULL)
 603                 BUG();
 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                 if (HWGROUP(drive)->handler != NULL)
 694                         BUG();
 695                 ide_set_handler(drive, &idescsi_transfer_pc,
 696                                 get_timeout(pc), idescsi_expiry);
 697                 /* Issue the packet command */
 698                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 699                 return ide_started;
 700         } else {
 701                 /* Issue the packet command */
 702                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 703                 return idescsi_transfer_pc(drive);
 704         }
 705 }
 706
 707 /*
 708  *      idescsi_do_request is our request handling function.
 709  */
 710 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 711 {
 712 #if IDESCSI_DEBUG_LOG
 713         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);
 714         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
 715 #endif /* IDESCSI_DEBUG_LOG */
 716
 717         if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
 718                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
 719         }
 720         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 721         idescsi_end_request (drive, 0, 0);
 722         return ide_stopped;
 723 }
 724
 725 static void idescsi_add_settings(ide_drive_t *drive)
 726 {
 727         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 728
 729 /*
 730  *                      drive   setting name    read/write      ioctl   ioctl           data type       min     max     mul_factor      div_factor      data pointer            set function
 731  */
 732         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 733         ide_add_setting(drive,  "bios_head",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 734         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 735         ide_add_setting(drive,  "transform",    SETTING_RW,     -1,     -1,             TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 736         ide_add_setting(drive,  "log",          SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 737 }
 738
 739 /*
 740  *      Driver initialization.
 741  */
 742 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 743 {
 744         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 745                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 746         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
 747         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 748 #if IDESCSI_DEBUG_LOG
 749         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 750 #endif /* IDESCSI_DEBUG_LOG */
 751         idescsi_add_settings(drive);
 752 }
 753
 754 static int ide_scsi_remove(struct device *dev)
 755 {
 756         ide_drive_t *drive = to_ide_device(dev);
 757         struct Scsi_Host *scsihost = drive->driver_data;
 758         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 759         struct gendisk *g = scsi->disk;
 760
 761         ide_unregister_subdriver(drive, scsi->driver);
 762
 763         ide_unregister_region(g);
 764
 765         drive->driver_data = NULL;
 766         g->private_data = NULL;
 767         put_disk(g);
 768
 769         scsi_remove_host(scsihost);
 770         ide_scsi_put(scsi);
 771
 772         return 0;
 773 }
 774
 775 static int ide_scsi_probe(struct device *);
 776
 777 #ifdef CONFIG_PROC_FS
 778 static ide_proc_entry_t idescsi_proc[] = {
 779         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 780         { NULL, 0, NULL, NULL }
 781 };
 782 #else
 783 # define idescsi_proc   NULL
 784 #endif
 785
 786 static ide_driver_t idescsi_driver = {
 787         .owner                  = THIS_MODULE,
 788         .gen_driver = {
 789                 .name           = "ide-scsi",
 790                 .bus            = &ide_bus_type,
 791                 .probe          = ide_scsi_probe,
 792                 .remove         = ide_scsi_remove,
 793         },
 794         .version                = IDESCSI_VERSION,
 795         .media                  = ide_scsi,
 796         .supports_dsc_overlap   = 0,
 797         .proc                   = idescsi_proc,
 798         .do_request             = idescsi_do_request,
 799         .end_request            = idescsi_end_request,
 800         .error                  = idescsi_atapi_error,
 801         .abort                  = idescsi_atapi_abort,
 802 };
 803
 804 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 805 {
 806         struct gendisk *disk = inode->i_bdev->bd_disk;
 807         struct ide_scsi_obj *scsi;
 808         ide_drive_t *drive;
 809
 810         if (!(scsi = ide_scsi_get(disk)))
 811                 return -ENXIO;
 812
 813         drive = scsi->drive;
 814
 815         drive->usage++;
 816
 817         return 0;
 818 }
 819
 820 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 821 {
 822         struct gendisk *disk = inode->i_bdev->bd_disk;
 823         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 824         ide_drive_t *drive = scsi->drive;
 825
 826         drive->usage--;
 827
 828         ide_scsi_put(scsi);
 829
 830         return 0;
 831 }
 832
 833 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 834                         unsigned int cmd, unsigned long arg)
 835 {
 836         struct block_device *bdev = inode->i_bdev;
 837         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 838         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 839 }
 840
 841 static struct block_device_operations idescsi_ops = {
 842         .owner          = THIS_MODULE,
 843         .open           = idescsi_ide_open,
 844         .release        = idescsi_ide_release,
 845         .ioctl          = idescsi_ide_ioctl,
 846 };
 847
 848 static int idescsi_slave_configure(struct scsi_device * sdp)
 849 {
 850         /* Configure detected device */
 851         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 852         return 0;
 853 }
 854
 855 static const char *idescsi_info (struct Scsi_Host *host)
 856 {
 857         return "SCSI host adapter emulation for IDE ATAPI devices";
 858 }
 859
 860 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 861 {
 862         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 863
 864         if (cmd == SG_SET_TRANSFORM) {
 865                 if (arg)
 866                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 867                 else
 868                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 869                 return 0;
 870         } else if (cmd == SG_GET_TRANSFORM)
 871                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 872         return -EINVAL;
 873 }
 874
 875 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
 876 {
 877         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 878
 879         /* this was a layering violation and we can't support it
 880            anymore, sorry. */
 881 #if 0
 882         struct gendisk *disk = cmd->request->rq_disk;
 883
 884         if (disk) {
 885                 struct struct scsi_device_Template **p = disk->private_data;
 886                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
 887                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 888         }
 889 #endif
 890         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
 891 }
 892
 893 static int idescsi_queue (struct scsi_cmnd *cmd,
 894                 void (*done)(struct scsi_cmnd *))
 895 {
 896         struct Scsi_Host *host = cmd->device->host;
 897         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 898         ide_drive_t *drive = scsi->drive;
 899         struct request *rq = NULL;
 900         idescsi_pc_t *pc = NULL;
 901
 902         if (!drive) {
 903                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 904                 goto abort;
 905         }
 906         scsi = drive_to_idescsi(drive);
 907         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 908         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 909         if (rq == NULL || pc == NULL) {
 910                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 911                 goto abort;
 912         }
 913
 914         memset (pc->c, 0, 12);
 915         pc->flags = 0;
 916         pc->rq = rq;
 917         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 918         if (cmd->use_sg) {
 919                 pc->buffer = NULL;
 920                 pc->sg = cmd->request_buffer;
 921         } else {
 922                 pc->buffer = cmd->request_buffer;
 923                 pc->sg = NULL;
 924         }
 925         pc->b_count = 0;
 926         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
 927         pc->scsi_cmd = cmd;
 928         pc->done = done;
 929         pc->timeout = jiffies + cmd->timeout_per_command;
 930
 931         if (should_transform(drive, cmd))
 932                 set_bit(PC_TRANSFORM, &pc->flags);
 933         idescsi_transform_pc1 (drive, pc);
 934
 935         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 936                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 937                 hexdump(cmd->cmnd, cmd->cmd_len);
 938                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 939                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 940                         hexdump(pc->c, 12);
 941                 }
 942         }
 943
 944         ide_init_drive_cmd (rq);
 945         rq->special = (char *) pc;
 946         rq->flags = REQ_SPECIAL;
 947         spin_unlock_irq(host->host_lock);
 948         rq->rq_disk = scsi->disk;
 949         (void) ide_do_drive_cmd (drive, rq, ide_end);
 950         spin_lock_irq(host->host_lock);
 951         return 0;
 952 abort:
 953         kfree (pc);
 954         kfree (rq);
 955         cmd->result = DID_ERROR << 16;
 956         done(cmd);
 957         return 0;
 958 }
 959
 960 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 961 {
 962         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 963         ide_drive_t    *drive = scsi->drive;
 964         int             busy;
 965         int             ret   = FAILED;
 966
 967         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 968
 969         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 970                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 971
 972         if (!drive) {
 973                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 974                 WARN_ON(1);
 975                 goto no_drive;
 976         }
 977
 978         /* First give it some more time, how much is "right" is hard to say :-( */
 979
 980         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 981         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 982                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 983
 984         spin_lock_irq(&ide_lock);
 985
 986         /* If there is no pc running we're done (our interrupt took care of it) */
 987         if (!scsi->pc) {
 988                 ret = SUCCESS;
 989                 goto ide_unlock;
 990         }
 991
 992         /* It's somewhere in flight. Does ide subsystem agree? */
 993         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 994             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 995                 /*
 996                  * FIXME - not sure this condition can ever occur
 997                  */
 998                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 999
1000                 if (scsi->pc->rq->flags & REQ_SENSE)
1001                         kfree(scsi->pc->buffer);
1002                 kfree(scsi->pc->rq);
1003                 kfree(scsi->pc);
1004                 scsi->pc = NULL;
1005
1006                 ret = SUCCESS;
1007         }
1008
1009 ide_unlock:
1010         spin_unlock_irq(&ide_lock);
1011 no_drive:
1012         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1013                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
1014
1015         return ret;
1016 }
1017
1018 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
1019 {
1020         struct request *req;
1021         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
1022         ide_drive_t    *drive = scsi->drive;
1023         int             ready = 0;
1024         int             ret   = SUCCESS;
1025
1026         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1027
1028         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1029                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1030
1031         if (!drive) {
1032                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1033                 WARN_ON(1);
1034                 return FAILED;
1035         }
1036
1037         spin_lock_irq(cmd->device->host->host_lock);
1038         spin_lock(&ide_lock);
1039
1040         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1041                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1042                 spin_unlock(&ide_lock);
1043                 spin_unlock_irq(cmd->device->host->host_lock);
1044                 return FAILED;
1045         }
1046
1047         /* kill current request */
1048         blkdev_dequeue_request(req);
1049         end_that_request_last(req);
1050         if (req->flags & REQ_SENSE)
1051                 kfree(scsi->pc->buffer);
1052         kfree(scsi->pc);
1053         scsi->pc = NULL;
1054         kfree(req);
1055
1056         /* now nuke the drive queue */
1057         while ((req = elv_next_request(drive->queue))) {
1058                 blkdev_dequeue_request(req);
1059                 end_that_request_last(req);
1060         }
1061
1062         HWGROUP(drive)->rq = NULL;
1063         HWGROUP(drive)->handler = NULL;
1064         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
1065         spin_unlock(&ide_lock);
1066
1067         ide_do_reset(drive);
1068
1069         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1070
1071         do {
1072                 spin_unlock_irq(cmd->device->host->host_lock);
1073                 msleep(50);
1074                 spin_lock_irq(cmd->device->host->host_lock);
1075         } while ( HWGROUP(drive)->handler );
1076
1077         ready = drive_is_ready(drive);
1078         HWGROUP(drive)->busy--;
1079         if (!ready) {
1080                 printk (KERN_ERR "ide-scsi: reset failed!\n");
1081                 ret = FAILED;
1082         }
1083
1084         spin_unlock_irq(cmd->device->host->host_lock);
1085         return ret;
1086 }
1087
1088 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1089                 sector_t capacity, int *parm)
1090 {
1091         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1092         ide_drive_t *drive = idescsi->drive;
1093
1094         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1095                 parm[0] = drive->bios_head;
1096                 parm[1] = drive->bios_sect;
1097                 parm[2] = drive->bios_cyl;
1098         }
1099         return 0;
1100 }
1101
1102 static struct scsi_host_template idescsi_template = {
1103         .module                 = THIS_MODULE,
1104         .name                   = "idescsi",
1105         .info                   = idescsi_info,
1106         .slave_configure        = idescsi_slave_configure,
1107         .ioctl                  = idescsi_ioctl,
1108         .queuecommand           = idescsi_queue,
1109         .eh_abort_handler       = idescsi_eh_abort,
1110         .eh_host_reset_handler  = idescsi_eh_reset,
1111         .bios_param             = idescsi_bios,
1112         .can_queue              = 40,
1113         .this_id                = -1,
1114         .sg_tablesize           = 256,
1115         .cmd_per_lun            = 5,
1116         .max_sectors            = 128,
1117         .use_clustering         = DISABLE_CLUSTERING,
1118         .emulated               = 1,
1119         .proc_name              = "ide-scsi",
1120 };
1121
1122 static int ide_scsi_probe(struct device *dev)
1123 {
1124         ide_drive_t *drive = to_ide_device(dev);
1125         idescsi_scsi_t *idescsi;
1126         struct Scsi_Host *host;
1127         struct gendisk *g;
1128         static int warned;
1129         int err = -ENOMEM;
1130
1131         if (!warned && drive->media == ide_cdrom) {
1132                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1133                 warned = 1;
1134         }
1135
1136         if (!strstr("ide-scsi", drive->driver_req) ||
1137             !drive->present ||
1138             drive->media == ide_disk ||
1139             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1140                 return -ENODEV;
1141
1142         g = alloc_disk(1 << PARTN_BITS);
1143         if (!g)
1144                 goto out_host_put;
1145
1146         ide_init_disk(g, drive);
1147
1148         host->max_id = 1;
1149
1150 #if IDESCSI_DEBUG_LOG
1151         if (drive->id->last_lun)
1152                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1153 #endif
1154         if ((drive->id->last_lun & 0x7) != 7)
1155                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1156         else
1157                 host->max_lun = 1;
1158
1159         drive->driver_data = host;
1160         idescsi = scsihost_to_idescsi(host);
1161         idescsi->drive = drive;
1162         idescsi->driver = &idescsi_driver;
1163         idescsi->host = host;
1164         idescsi->disk = g;
1165         g->private_data = &idescsi->driver;
1166         ide_register_subdriver(drive, &idescsi_driver);
1167         err = 0;
1168         idescsi_setup(drive, idescsi);
1169         g->fops = &idescsi_ops;
1170         ide_register_region(g);
1171         err = scsi_add_host(host, &drive->gendev);
1172         if (!err) {
1173                 scsi_scan_host(host);
1174                 return 0;
1175         }
1176         /* fall through on error */
1177         ide_unregister_region(g);
1178         ide_unregister_subdriver(drive, &idescsi_driver);
1179
1180         put_disk(g);
1181 out_host_put:
1182         scsi_host_put(host);
1183         return err;
1184 }
1185
1186 static int __init init_idescsi_module(void)
1187 {
1188         return driver_register(&idescsi_driver.gen_driver);
1189 }
1190
1191 static void __exit exit_idescsi_module(void)
1192 {
1193         driver_unregister(&idescsi_driver.gen_driver);
1194 }
1195
1196 module_init(init_idescsi_module);
1197 module_exit(exit_idescsi_module);
1198 MODULE_LICENSE("GPL");