drivers/scsi/ide-scsi.c

   1 /*
   2  * linux/drivers/scsi/ide-scsi.c        Version 0.9             Jul   4, 1999
   3  *
   4  * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
   5  */
   6
   7 /*
   8  * Emulation of a SCSI host adapter for IDE ATAPI devices.
   9  *
  10  * With this driver, one can use the Linux SCSI drivers instead of the
  11  * native IDE ATAPI drivers.
  12  *
  13  * Ver 0.1   Dec  3 96   Initial version.
  14  * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
  15  *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
  16  *                        to Janos Farkas for pointing this out.
  17  *                       Avoid using bitfields in structures for m68k.
  18  *                       Added Scatter/Gather and DMA support.
  19  * Ver 0.4   Dec  7 97   Add support for ATAPI PD/CD drives.
  20  *                       Use variable timeout for each command.
  21  * Ver 0.5   Jan  2 98   Fix previous PD/CD support.
  22  *                       Allow disabling of SCSI-6 to SCSI-10 transformation.
  23  * Ver 0.6   Jan 27 98   Allow disabling of SCSI command translation layer
  24  *                        for access through /dev/sg.
  25  *                       Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
  26  * Ver 0.7   Dec 04 98   Ignore commands where lun != 0 to avoid multiple
  27  *                        detection of devices with CONFIG_SCSI_MULTI_LUN
  28  * Ver 0.8   Feb 05 99   Optical media need translation too. Reverse 0.7.
  29  * Ver 0.9   Jul 04 99   Fix a bug in SG_SET_TRANSFORM.
  30  * Ver 0.91  Jun 10 02   Fix "off by one" error in transforms
  31  * Ver 0.92  Dec 31 02   Implement new SCSI mid level API
  32  */
  33
  34 #define IDESCSI_VERSION "0.92"
  35
  36 #include <linux/module.h>
  37 #include <linux/config.h>
  38 #include <linux/types.h>
  39 #include <linux/string.h>
  40 #include <linux/kernel.h>
  41 #include <linux/mm.h>
  42 #include <linux/ioport.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/errno.h>
  45 #include <linux/hdreg.h>
  46 #include <linux/slab.h>
  47 #include <linux/ide.h>
  48 #include <linux/scatterlist.h>
  49 #include <linux/delay.h>
  50
  51 #include <asm/io.h>
  52 #include <asm/bitops.h>
  53 #include <asm/uaccess.h>
  54
  55 #include <scsi/scsi.h>
  56 #include <scsi/scsi_cmnd.h>
  57 #include <scsi/scsi_device.h>
  58 #include <scsi/scsi_host.h>
  59 #include <scsi/scsi_tcq.h>
  60 #include <scsi/sg.h>
  61
  62 #define IDESCSI_DEBUG_LOG               0
  63
  64 typedef struct idescsi_pc_s {
  65         u8 c[12];                               /* Actual packet bytes */
  66         int request_transfer;                   /* Bytes to transfer */
  67         int actually_transferred;               /* Bytes actually transferred */
  68         int buffer_size;                        /* Size of our data buffer */
  69         struct request *rq;                     /* The corresponding request */
  70         u8 *buffer;                             /* Data buffer */
  71         u8 *current_position;                   /* Pointer into the above buffer */
  72         struct scatterlist *sg;                 /* Scatter gather table */
  73         int b_count;                            /* Bytes transferred from current entry */
  74         struct scsi_cmnd *scsi_cmd;             /* SCSI command */
  75         void (*done)(struct scsi_cmnd *);       /* Scsi completion routine */
  76         unsigned long flags;                    /* Status/Action flags */
  77         unsigned long timeout;                  /* Command timeout */
  78 } idescsi_pc_t;
  79
  80 /*
  81  *      Packet command status bits.
  82  */
  83 #define PC_DMA_IN_PROGRESS              0       /* 1 while DMA in progress */
  84 #define PC_WRITING                      1       /* Data direction */
  85 #define PC_TRANSFORM                    2       /* transform SCSI commands */
  86 #define PC_TIMEDOUT                     3       /* command timed out */
  87 #define PC_DMA_OK                       4       /* Use DMA */
  88
  89 /*
  90  *      SCSI command transformation layer
  91  */
  92 #define IDESCSI_TRANSFORM               0       /* Enable/Disable transformation */
  93 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
  94
  95 /*
  96  *      Log flags
  97  */
  98 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
  99
 100 typedef struct ide_scsi_obj {
 101         ide_drive_t             *drive;
 102         ide_driver_t            *driver;
 103         struct gendisk          *disk;
 104         struct Scsi_Host        *host;
 105
 106         idescsi_pc_t *pc;                       /* Current packet command */
 107         unsigned long flags;                    /* Status/Action flags */
 108         unsigned long transform;                /* SCSI cmd translation layer */
 109         unsigned long log;                      /* log flags */
 110 } idescsi_scsi_t;
 111
 112 static DECLARE_MUTEX(idescsi_ref_sem);
 113
 114 #define ide_scsi_g(disk) \
 115         container_of((disk)->private_data, struct ide_scsi_obj, driver)
 116
 117 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
 118 {
 119         struct ide_scsi_obj *scsi = NULL;
 120
 121         down(&idescsi_ref_sem);
 122         scsi = ide_scsi_g(disk);
 123         if (scsi)
 124                 scsi_host_get(scsi->host);
 125         up(&idescsi_ref_sem);
 126         return scsi;
 127 }
 128
 129 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 130 {
 131         down(&idescsi_ref_sem);
 132         scsi_host_put(scsi->host);
 133         up(&idescsi_ref_sem);
 134 }
 135
 136 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 137 {
 138         return (idescsi_scsi_t*) (&host[1]);
 139 }
 140
 141 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 142 {
 143         return scsihost_to_idescsi(ide_drive->driver_data);
 144 }
 145
 146 /*
 147  *      Per ATAPI device status bits.
 148  */
 149 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
 150
 151 /*
 152  *      ide-scsi requests.
 153  */
 154 #define IDESCSI_PC_RQ                   90
 155
 156 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
 157 {
 158         while (bcount--)
 159                 (void) HWIF(drive)->INB(IDE_DATA_REG);
 160 }
 161
 162 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
 163 {
 164         while (bcount--)
 165                 HWIF(drive)->OUTB(0, IDE_DATA_REG);
 166 }
 167
 168 /*
 169  *      PIO data transfer routines using the scatter gather table.
 170  */
 171 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 172 {
 173         int count;
 174         char *buf;
 175
 176         while (bcount) {
 177                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 178                         printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
 179                         idescsi_discard_data (drive, bcount);
 180                         return;
 181                 }
 182                 count = min(pc->sg->length - pc->b_count, bcount);
 183                 if (PageHighMem(pc->sg->page)) {
 184                         unsigned long flags;
 185
 186                         local_irq_save(flags);
 187                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) + pc->sg->offset;
 188                         drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count);
 189                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 190                         local_irq_restore(flags);
 191                 } else {
 192                         buf = page_address(pc->sg->page) + pc->sg->offset;
 193                         drive->hwif->atapi_input_bytes(drive, buf + pc->b_count, count);
 194                 }
 195                 bcount -= count; pc->b_count += count;
 196                 if (pc->b_count == pc->sg->length) {
 197                         pc->sg++;
 198                         pc->b_count = 0;
 199                 }
 200         }
 201 }
 202
 203 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 204 {
 205         int count;
 206         char *buf;
 207
 208         while (bcount) {
 209                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 210                         printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
 211                         idescsi_output_zeros (drive, bcount);
 212                         return;
 213                 }
 214                 count = min(pc->sg->length - pc->b_count, bcount);
 215                 if (PageHighMem(pc->sg->page)) {
 216                         unsigned long flags;
 217
 218                         local_irq_save(flags);
 219                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) + pc->sg->offset;
 220                         drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count);
 221                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 222                         local_irq_restore(flags);
 223                 } else {
 224                         buf = page_address(pc->sg->page) + pc->sg->offset;
 225                         drive->hwif->atapi_output_bytes(drive, buf + pc->b_count, count);
 226                 }
 227                 bcount -= count; pc->b_count += count;
 228                 if (pc->b_count == pc->sg->length) {
 229                         pc->sg++;
 230                         pc->b_count = 0;
 231                 }
 232         }
 233 }
 234
 235 /*
 236  *      Most of the SCSI commands are supported directly by ATAPI devices.
 237  *      idescsi_transform_pc handles the few exceptions.
 238  */
 239 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
 240 {
 241         u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
 242         char *atapi_buf;
 243
 244         if (!test_bit(PC_TRANSFORM, &pc->flags))
 245                 return;
 246         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 247                 if (c[0] == READ_6 || c[0] == WRITE_6) {
 248                         c[8] = c[4];            c[5] = c[3];            c[4] = c[2];
 249                         c[3] = c[1] & 0x1f;     c[2] = 0;               c[1] &= 0xe0;
 250                         c[0] += (READ_10 - READ_6);
 251                 }
 252                 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
 253                         unsigned short new_len;
 254                         if (!scsi_buf)
 255                                 return;
 256                         if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
 257                                 return;
 258                         memset(atapi_buf, 0, pc->buffer_size + 4);
 259                         memset (c, 0, 12);
 260                         c[0] = sc[0] | 0x40;
 261                         c[1] = sc[1];
 262                         c[2] = sc[2];
 263                         new_len = sc[4] + 4;
 264                         c[8] = new_len;
 265                         c[7] = new_len >> 8;
 266                         c[9] = sc[5];
 267                         if (c[0] == MODE_SELECT_10) {
 268                                 atapi_buf[1] = scsi_buf[0];     /* Mode data length */
 269                                 atapi_buf[2] = scsi_buf[1];     /* Medium type */
 270                                 atapi_buf[3] = scsi_buf[2];     /* Device specific parameter */
 271                                 atapi_buf[7] = scsi_buf[3];     /* Block descriptor length */
 272                                 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
 273                         }
 274                         pc->buffer = atapi_buf;
 275                         pc->request_transfer += 4;
 276                         pc->buffer_size += 4;
 277                 }
 278         }
 279 }
 280
 281 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
 282 {
 283         u8 *atapi_buf = pc->buffer;
 284         u8 *sc = pc->scsi_cmd->cmnd;
 285         u8 *scsi_buf = pc->scsi_cmd->request_buffer;
 286
 287         if (!test_bit(PC_TRANSFORM, &pc->flags))
 288                 return;
 289         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 290                 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
 291                         scsi_buf[0] = atapi_buf[1];             /* Mode data length */
 292                         scsi_buf[1] = atapi_buf[2];             /* Medium type */
 293                         scsi_buf[2] = atapi_buf[3];             /* Device specific parameter */
 294                         scsi_buf[3] = atapi_buf[7];             /* Block descriptor length */
 295                         memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
 296                 }
 297                 if (pc->c[0] == INQUIRY) {
 298                         scsi_buf[2] |= 2;                       /* ansi_revision */
 299                         scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
 300                 }
 301         }
 302         if (atapi_buf && atapi_buf != scsi_buf)
 303                 kfree(atapi_buf);
 304 }
 305
 306 static void hexdump(u8 *x, int len)
 307 {
 308         int i;
 309
 310         printk("[ ");
 311         for (i = 0; i < len; i++)
 312                 printk("%x ", x[i]);
 313         printk("]\n");
 314 }
 315
 316 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
 317 {
 318         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 319         idescsi_pc_t   *pc;
 320         struct request *rq;
 321         u8             *buf;
 322
 323         /* stuff a sense request in front of our current request */
 324         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 325         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 326         buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 327         if (pc == NULL || rq == NULL || buf == NULL) {
 328                 if (pc) kfree(pc);
 329                 if (rq) kfree(rq);
 330                 if (buf) kfree(buf);
 331                 return -ENOMEM;
 332         }
 333         memset (pc, 0, sizeof (idescsi_pc_t));
 334         memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
 335         ide_init_drive_cmd(rq);
 336         rq->special = (char *) pc;
 337         pc->rq = rq;
 338         pc->buffer = buf;
 339         pc->c[0] = REQUEST_SENSE;
 340         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
 341         rq->flags = REQ_SENSE;
 342         pc->timeout = jiffies + WAIT_READY;
 343         /* NOTE! Save the failed packet command in "rq->buffer" */
 344         rq->buffer = (void *) failed_command->special;
 345         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
 346         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 347                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 348                 hexdump(pc->c, 6);
 349         }
 350         rq->rq_disk = scsi->disk;
 351         return ide_do_drive_cmd(drive, rq, ide_preempt);
 352 }
 353
 354 static int idescsi_end_request(ide_drive_t *, int, int);
 355
 356 static ide_startstop_t
 357 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 358 {
 359         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
 360                 /* force an abort */
 361                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
 362
 363         rq->errors++;
 364
 365         idescsi_end_request(drive, 0, 0);
 366
 367         return ide_stopped;
 368 }
 369
 370 static ide_startstop_t
 371 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 372 {
 373 #if IDESCSI_DEBUG_LOG
 374         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
 375                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
 376 #endif
 377         rq->errors |= ERROR_MAX;
 378
 379         idescsi_end_request(drive, 0, 0);
 380
 381         return ide_stopped;
 382 }
 383
 384 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 385 {
 386         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 387         struct request *rq = HWGROUP(drive)->rq;
 388         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
 389         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 390         struct Scsi_Host *host;
 391         u8 *scsi_buf;
 392         unsigned long flags;
 393
 394         if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
 395                 ide_end_request(drive, uptodate, nrsecs);
 396                 return 0;
 397         }
 398         ide_end_drive_cmd (drive, 0, 0);
 399         if (rq->flags & REQ_SENSE) {
 400                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
 401                 if (log) {
 402                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 403                         hexdump(pc->buffer,16);
 404                 }
 405                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
 406                 kfree(pc->buffer);
 407                 kfree(pc);
 408                 kfree(rq);
 409                 pc = opc;
 410                 rq = pc->rq;
 411                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 412                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
 413         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
 414                 if (log)
 415                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 416                                         drive->name, pc->scsi_cmd->serial_number);
 417                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 418         } else if (rq->errors >= ERROR_MAX) {
 419                 pc->scsi_cmd->result = DID_ERROR << 16;
 420                 if (log)
 421                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 422         } else if (rq->errors) {
 423                 if (log)
 424                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 425                 if (!idescsi_check_condition(drive, rq))
 426                         /* we started a request sense, so we'll be back, exit for now */
 427                         return 0;
 428                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 429         } else {
 430                 pc->scsi_cmd->result = DID_OK << 16;
 431                 idescsi_transform_pc2 (drive, pc);
 432                 if (log) {
 433                         printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
 434                         if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
 435                                 printk(", rst = ");
 436                                 scsi_buf = pc->scsi_cmd->request_buffer;
 437                                 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
 438                         } else printk("\n");
 439                 }
 440         }
 441         host = pc->scsi_cmd->device->host;
 442         spin_lock_irqsave(host->host_lock, flags);
 443         pc->done(pc->scsi_cmd);
 444         spin_unlock_irqrestore(host->host_lock, flags);
 445         kfree(pc);
 446         kfree(rq);
 447         scsi->pc = NULL;
 448         return 0;
 449 }
 450
 451 static inline unsigned long get_timeout(idescsi_pc_t *pc)
 452 {
 453         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 454 }
 455
 456 static int idescsi_expiry(ide_drive_t *drive)
 457 {
 458         idescsi_scsi_t *scsi = drive->driver_data;
 459         idescsi_pc_t   *pc   = scsi->pc;
 460
 461 #if IDESCSI_DEBUG_LOG
 462         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
 463 #endif
 464         set_bit(PC_TIMEDOUT, &pc->flags);
 465
 466         return 0;                                       /* we do not want the ide subsystem to retry */
 467 }
 468
 469 /*
 470  *      Our interrupt handler.
 471  */
 472 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 473 {
 474         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 475         idescsi_pc_t *pc=scsi->pc;
 476         struct request *rq = pc->rq;
 477         atapi_bcount_t bcount;
 478         atapi_status_t status;
 479         atapi_ireason_t ireason;
 480         atapi_feature_t feature;
 481
 482         unsigned int temp;
 483
 484 #if IDESCSI_DEBUG_LOG
 485         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
 486 #endif /* IDESCSI_DEBUG_LOG */
 487
 488         if (test_bit(PC_TIMEDOUT, &pc->flags)){
 489 #if IDESCSI_DEBUG_LOG
 490                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
 491                                 pc->scsi_cmd->serial_number, jiffies);
 492 #endif
 493                 /* end this request now - scsi should retry it*/
 494                 idescsi_end_request (drive, 1, 0);
 495                 return ide_stopped;
 496         }
 497         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
 498 #if IDESCSI_DEBUG_LOG
 499                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
 500 #endif /* IDESCSI_DEBUG_LOG */
 501                 pc->actually_transferred=pc->request_transfer;
 502                 (void) HWIF(drive)->ide_dma_end(drive);
 503         }
 504
 505         feature.all = 0;
 506         /* Clear the interrupt */
 507         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
 508
 509         if (!status.b.drq) {
 510                 /* No more interrupts */
 511                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 512                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
 513                 local_irq_enable();
 514                 if (status.b.check)
 515                         rq->errors++;
 516                 idescsi_end_request (drive, 1, 0);
 517                 return ide_stopped;
 518         }
 519         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
 520         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
 521         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 522
 523         if (ireason.b.cod) {
 524                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
 525                 return ide_do_reset (drive);
 526         }
 527         if (ireason.b.io) {
 528                 temp = pc->actually_transferred + bcount.all;
 529                 if (temp > pc->request_transfer) {
 530                         if (temp > pc->buffer_size) {
 531                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
 532                                         "send us more data than expected "
 533                                         "- discarding data\n");
 534                                 temp = pc->buffer_size - pc->actually_transferred;
 535                                 if (temp) {
 536                                         clear_bit(PC_WRITING, &pc->flags);
 537                                         if (pc->sg)
 538                                                 idescsi_input_buffers(drive, pc, temp);
 539                                         else
 540                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
 541                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
 542                                 }
 543                                 pc->actually_transferred += temp;
 544                                 pc->current_position += temp;
 545                                 idescsi_discard_data(drive, bcount.all - temp);
 546                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 547                                 return ide_started;
 548                         }
 549 #if IDESCSI_DEBUG_LOG
 550                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
 551 #endif /* IDESCSI_DEBUG_LOG */
 552                 }
 553         }
 554         if (ireason.b.io) {
 555                 clear_bit(PC_WRITING, &pc->flags);
 556                 if (pc->sg)
 557                         idescsi_input_buffers(drive, pc, bcount.all);
 558                 else
 559                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
 560         } else {
 561                 set_bit(PC_WRITING, &pc->flags);
 562                 if (pc->sg)
 563                         idescsi_output_buffers (drive, pc, bcount.all);
 564                 else
 565                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
 566         }
 567         /* Update the current position */
 568         pc->actually_transferred += bcount.all;
 569         pc->current_position += bcount.all;
 570
 571         /* And set the interrupt handler again */
 572         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 573         return ide_started;
 574 }
 575
 576 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 577 {
 578         ide_hwif_t *hwif = drive->hwif;
 579         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 580         idescsi_pc_t *pc = scsi->pc;
 581         atapi_ireason_t ireason;
 582         ide_startstop_t startstop;
 583
 584         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
 585                 printk(KERN_ERR "ide-scsi: Strange, packet command "
 586                         "initiated yet DRQ isn't asserted\n");
 587                 return startstop;
 588         }
 589         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 590         if (!ireason.b.cod || ireason.b.io) {
 591                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
 592                                 "issuing a packet command\n");
 593                 return ide_do_reset (drive);
 594         }
 595         if (HWGROUP(drive)->handler != NULL)
 596                 BUG();
 597         /* Set the interrupt routine */
 598         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 599         /* Send the actual packet */
 600         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
 601         if (test_bit (PC_DMA_OK, &pc->flags)) {
 602                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
 603                 hwif->dma_start(drive);
 604         }
 605         return ide_started;
 606 }
 607
 608 static inline int idescsi_set_direction(idescsi_pc_t *pc)
 609 {
 610         switch (pc->c[0]) {
 611                 case READ_6: case READ_10: case READ_12:
 612                         clear_bit(PC_WRITING, &pc->flags);
 613                         return 0;
 614                 case WRITE_6: case WRITE_10: case WRITE_12:
 615                         set_bit(PC_WRITING, &pc->flags);
 616                         return 0;
 617                 default:
 618                         return 1;
 619         }
 620 }
 621
 622 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
 623 {
 624         ide_hwif_t *hwif = drive->hwif;
 625         struct scatterlist *sg, *scsi_sg;
 626         int segments;
 627
 628         if (!pc->request_transfer || pc->request_transfer % 1024)
 629                 return 1;
 630
 631         if (idescsi_set_direction(pc))
 632                 return 1;
 633
 634         sg = hwif->sg_table;
 635         scsi_sg = pc->scsi_cmd->request_buffer;
 636         segments = pc->scsi_cmd->use_sg;
 637
 638         if (segments > hwif->sg_max_nents)
 639                 return 1;
 640
 641         if (!segments) {
 642                 hwif->sg_nents = 1;
 643                 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
 644         } else {
 645                 hwif->sg_nents = segments;
 646                 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 647         }
 648
 649         return 0;
 650 }
 651
 652 /*
 653  *      Issue a packet command
 654  */
 655 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
 656 {
 657         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 658         ide_hwif_t *hwif = drive->hwif;
 659         atapi_feature_t feature;
 660         atapi_bcount_t bcount;
 661
 662         scsi->pc=pc;                                                    /* Set the current packet command */
 663         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
 664         pc->current_position=pc->buffer;
 665         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
 666
 667         feature.all = 0;
 668         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
 669                 hwif->sg_mapped = 1;
 670                 feature.b.dma = !hwif->dma_setup(drive);
 671                 hwif->sg_mapped = 0;
 672         }
 673
 674         SELECT_DRIVE(drive);
 675         if (IDE_CONTROL_REG)
 676                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
 677
 678         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
 679         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
 680         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
 681
 682         if (feature.b.dma)
 683                 set_bit(PC_DMA_OK, &pc->flags);
 684
 685         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
 686                 if (HWGROUP(drive)->handler != NULL)
 687                         BUG();
 688                 ide_set_handler(drive, &idescsi_transfer_pc,
 689                                 get_timeout(pc), idescsi_expiry);
 690                 /* Issue the packet command */
 691                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 692                 return ide_started;
 693         } else {
 694                 /* Issue the packet command */
 695                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 696                 return idescsi_transfer_pc(drive);
 697         }
 698 }
 699
 700 /*
 701  *      idescsi_do_request is our request handling function.
 702  */
 703 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 704 {
 705 #if IDESCSI_DEBUG_LOG
 706         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);
 707         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
 708 #endif /* IDESCSI_DEBUG_LOG */
 709
 710         if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
 711                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
 712         }
 713         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 714         idescsi_end_request (drive, 0, 0);
 715         return ide_stopped;
 716 }
 717
 718 static void idescsi_add_settings(ide_drive_t *drive)
 719 {
 720         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 721
 722 /*
 723  *                      drive   setting name    read/write      ioctl   ioctl           data type       min     max     mul_factor      div_factor      data pointer            set function
 724  */
 725         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 726         ide_add_setting(drive,  "bios_head",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 727         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 728         ide_add_setting(drive,  "transform",    SETTING_RW,     -1,     -1,             TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 729         ide_add_setting(drive,  "log",          SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 730 }
 731
 732 /*
 733  *      Driver initialization.
 734  */
 735 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 736 {
 737         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 738                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 739         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
 740         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 741 #if IDESCSI_DEBUG_LOG
 742         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 743 #endif /* IDESCSI_DEBUG_LOG */
 744         idescsi_add_settings(drive);
 745 }
 746
 747 static int ide_scsi_remove(struct device *dev)
 748 {
 749         ide_drive_t *drive = to_ide_device(dev);
 750         struct Scsi_Host *scsihost = drive->driver_data;
 751         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 752         struct gendisk *g = scsi->disk;
 753
 754         ide_unregister_subdriver(drive, scsi->driver);
 755
 756         ide_unregister_region(g);
 757
 758         drive->driver_data = NULL;
 759         g->private_data = NULL;
 760         put_disk(g);
 761
 762         scsi_remove_host(scsihost);
 763         ide_scsi_put(scsi);
 764
 765         return 0;
 766 }
 767
 768 static int ide_scsi_probe(struct device *);
 769
 770 #ifdef CONFIG_PROC_FS
 771 static ide_proc_entry_t idescsi_proc[] = {
 772         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 773         { NULL, 0, NULL, NULL }
 774 };
 775 #else
 776 # define idescsi_proc   NULL
 777 #endif
 778
 779 static ide_driver_t idescsi_driver = {
 780         .owner                  = THIS_MODULE,
 781         .gen_driver = {
 782                 .name           = "ide-scsi",
 783                 .bus            = &ide_bus_type,
 784                 .probe          = ide_scsi_probe,
 785                 .remove         = ide_scsi_remove,
 786         },
 787         .version                = IDESCSI_VERSION,
 788         .media                  = ide_scsi,
 789         .supports_dsc_overlap   = 0,
 790         .proc                   = idescsi_proc,
 791         .do_request             = idescsi_do_request,
 792         .end_request            = idescsi_end_request,
 793         .error                  = idescsi_atapi_error,
 794         .abort                  = idescsi_atapi_abort,
 795 };
 796
 797 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 798 {
 799         struct gendisk *disk = inode->i_bdev->bd_disk;
 800         struct ide_scsi_obj *scsi;
 801         ide_drive_t *drive;
 802
 803         if (!(scsi = ide_scsi_get(disk)))
 804                 return -ENXIO;
 805
 806         drive = scsi->drive;
 807
 808         drive->usage++;
 809
 810         return 0;
 811 }
 812
 813 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 814 {
 815         struct gendisk *disk = inode->i_bdev->bd_disk;
 816         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 817         ide_drive_t *drive = scsi->drive;
 818
 819         drive->usage--;
 820
 821         ide_scsi_put(scsi);
 822
 823         return 0;
 824 }
 825
 826 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 827                         unsigned int cmd, unsigned long arg)
 828 {
 829         struct block_device *bdev = inode->i_bdev;
 830         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 831         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 832 }
 833
 834 static struct block_device_operations idescsi_ops = {
 835         .owner          = THIS_MODULE,
 836         .open           = idescsi_ide_open,
 837         .release        = idescsi_ide_release,
 838         .ioctl          = idescsi_ide_ioctl,
 839 };
 840
 841 static int idescsi_slave_configure(struct scsi_device * sdp)
 842 {
 843         /* Configure detected device */
 844         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 845         return 0;
 846 }
 847
 848 static const char *idescsi_info (struct Scsi_Host *host)
 849 {
 850         return "SCSI host adapter emulation for IDE ATAPI devices";
 851 }
 852
 853 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 854 {
 855         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 856
 857         if (cmd == SG_SET_TRANSFORM) {
 858                 if (arg)
 859                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 860                 else
 861                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 862                 return 0;
 863         } else if (cmd == SG_GET_TRANSFORM)
 864                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 865         return -EINVAL;
 866 }
 867
 868 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
 869 {
 870         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 871
 872         /* this was a layering violation and we can't support it
 873            anymore, sorry. */
 874 #if 0
 875         struct gendisk *disk = cmd->request->rq_disk;
 876
 877         if (disk) {
 878                 struct Scsi_Device_Template **p = disk->private_data;
 879                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
 880                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 881         }
 882 #endif
 883         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
 884 }
 885
 886 static int idescsi_queue (struct scsi_cmnd *cmd,
 887                 void (*done)(struct scsi_cmnd *))
 888 {
 889         struct Scsi_Host *host = cmd->device->host;
 890         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 891         ide_drive_t *drive = scsi->drive;
 892         struct request *rq = NULL;
 893         idescsi_pc_t *pc = NULL;
 894
 895         if (!drive) {
 896                 printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->device->id);
 897                 goto abort;
 898         }
 899         scsi = drive_to_idescsi(drive);
 900         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 901         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 902         if (rq == NULL || pc == NULL) {
 903                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 904                 goto abort;
 905         }
 906
 907         memset (pc->c, 0, 12);
 908         pc->flags = 0;
 909         pc->rq = rq;
 910         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 911         if (cmd->use_sg) {
 912                 pc->buffer = NULL;
 913                 pc->sg = cmd->request_buffer;
 914         } else {
 915                 pc->buffer = cmd->request_buffer;
 916                 pc->sg = NULL;
 917         }
 918         pc->b_count = 0;
 919         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
 920         pc->scsi_cmd = cmd;
 921         pc->done = done;
 922         pc->timeout = jiffies + cmd->timeout_per_command;
 923
 924         if (should_transform(drive, cmd))
 925                 set_bit(PC_TRANSFORM, &pc->flags);
 926         idescsi_transform_pc1 (drive, pc);
 927
 928         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 929                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 930                 hexdump(cmd->cmnd, cmd->cmd_len);
 931                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 932                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 933                         hexdump(pc->c, 12);
 934                 }
 935         }
 936
 937         ide_init_drive_cmd (rq);
 938         rq->special = (char *) pc;
 939         rq->flags = REQ_SPECIAL;
 940         spin_unlock_irq(host->host_lock);
 941         rq->rq_disk = scsi->disk;
 942         (void) ide_do_drive_cmd (drive, rq, ide_end);
 943         spin_lock_irq(host->host_lock);
 944         return 0;
 945 abort:
 946         if (pc) kfree (pc);
 947         if (rq) kfree (rq);
 948         cmd->result = DID_ERROR << 16;
 949         done(cmd);
 950         return 0;
 951 }
 952
 953 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 954 {
 955         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 956         ide_drive_t    *drive = scsi->drive;
 957         int             busy;
 958         int             ret   = FAILED;
 959
 960         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 961
 962         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 963                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 964
 965         if (!drive) {
 966                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 967                 WARN_ON(1);
 968                 goto no_drive;
 969         }
 970
 971         /* First give it some more time, how much is "right" is hard to say :-( */
 972
 973         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 974         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 975                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 976
 977         spin_lock_irq(&ide_lock);
 978
 979         /* If there is no pc running we're done (our interrupt took care of it) */
 980         if (!scsi->pc) {
 981                 ret = SUCCESS;
 982                 goto ide_unlock;
 983         }
 984
 985         /* It's somewhere in flight. Does ide subsystem agree? */
 986         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 987             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 988                 /*
 989                  * FIXME - not sure this condition can ever occur
 990                  */
 991                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 992
 993                 if (scsi->pc->rq->flags & REQ_SENSE)
 994                         kfree(scsi->pc->buffer);
 995                 kfree(scsi->pc->rq);
 996                 kfree(scsi->pc);
 997                 scsi->pc = NULL;
 998
 999                 ret = SUCCESS;
1000         }
1001
1002 ide_unlock:
1003         spin_unlock_irq(&ide_lock);
1004 no_drive:
1005         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1006                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
1007
1008         return ret;
1009 }
1010
1011 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
1012 {
1013         struct request *req;
1014         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
1015         ide_drive_t    *drive = scsi->drive;
1016         int             ready = 0;
1017         int             ret   = SUCCESS;
1018
1019         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1020
1021         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1022                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1023
1024         if (!drive) {
1025                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1026                 WARN_ON(1);
1027                 return FAILED;
1028         }
1029
1030         spin_lock_irq(cmd->device->host->host_lock);
1031         spin_lock(&ide_lock);
1032
1033         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1034                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1035                 spin_unlock(&ide_lock);
1036                 spin_unlock_irq(cmd->device->host->host_lock);
1037                 return FAILED;
1038         }
1039
1040         /* kill current request */
1041         blkdev_dequeue_request(req);
1042         end_that_request_last(req);
1043         if (req->flags & REQ_SENSE)
1044                 kfree(scsi->pc->buffer);
1045         kfree(scsi->pc);
1046         scsi->pc = NULL;
1047         kfree(req);
1048
1049         /* now nuke the drive queue */
1050         while ((req = elv_next_request(drive->queue))) {
1051                 blkdev_dequeue_request(req);
1052                 end_that_request_last(req);
1053         }
1054
1055         HWGROUP(drive)->rq = NULL;
1056         HWGROUP(drive)->handler = NULL;
1057         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
1058         spin_unlock(&ide_lock);
1059
1060         ide_do_reset(drive);
1061
1062         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1063
1064         do {
1065                 spin_unlock_irq(cmd->device->host->host_lock);
1066                 msleep(50);
1067                 spin_lock_irq(cmd->device->host->host_lock);
1068         } while ( HWGROUP(drive)->handler );
1069
1070         ready = drive_is_ready(drive);
1071         HWGROUP(drive)->busy--;
1072         if (!ready) {
1073                 printk (KERN_ERR "ide-scsi: reset failed!\n");
1074                 ret = FAILED;
1075         }
1076
1077         spin_unlock_irq(cmd->device->host->host_lock);
1078         return ret;
1079 }
1080
1081 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1082                 sector_t capacity, int *parm)
1083 {
1084         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1085         ide_drive_t *drive = idescsi->drive;
1086
1087         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1088                 parm[0] = drive->bios_head;
1089                 parm[1] = drive->bios_sect;
1090                 parm[2] = drive->bios_cyl;
1091         }
1092         return 0;
1093 }
1094
1095 static struct scsi_host_template idescsi_template = {
1096         .module                 = THIS_MODULE,
1097         .name                   = "idescsi",
1098         .info                   = idescsi_info,
1099         .slave_configure        = idescsi_slave_configure,
1100         .ioctl                  = idescsi_ioctl,
1101         .queuecommand           = idescsi_queue,
1102         .eh_abort_handler       = idescsi_eh_abort,
1103         .eh_host_reset_handler  = idescsi_eh_reset,
1104         .bios_param             = idescsi_bios,
1105         .can_queue              = 40,
1106         .this_id                = -1,
1107         .sg_tablesize           = 256,
1108         .cmd_per_lun            = 5,
1109         .max_sectors            = 128,
1110         .use_clustering         = DISABLE_CLUSTERING,
1111         .emulated               = 1,
1112         .proc_name              = "ide-scsi",
1113 };
1114
1115 static int ide_scsi_probe(struct device *dev)
1116 {
1117         ide_drive_t *drive = to_ide_device(dev);
1118         idescsi_scsi_t *idescsi;
1119         struct Scsi_Host *host;
1120         struct gendisk *g;
1121         static int warned;
1122         int err = -ENOMEM;
1123
1124         if (!warned && drive->media == ide_cdrom) {
1125                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1126                 warned = 1;
1127         }
1128
1129         if (!strstr("ide-scsi", drive->driver_req) ||
1130             !drive->present ||
1131             drive->media == ide_disk ||
1132             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1133                 return -ENODEV;
1134
1135         g = alloc_disk(1 << PARTN_BITS);
1136         if (!g)
1137                 goto out_host_put;
1138
1139         ide_init_disk(g, drive);
1140
1141         host->max_id = 1;
1142
1143 #if IDESCSI_DEBUG_LOG
1144         if (drive->id->last_lun)
1145                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1146 #endif
1147         if ((drive->id->last_lun & 0x7) != 7)
1148                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1149         else
1150                 host->max_lun = 1;
1151
1152         drive->driver_data = host;
1153         idescsi = scsihost_to_idescsi(host);
1154         idescsi->drive = drive;
1155         idescsi->driver = &idescsi_driver;
1156         idescsi->host = host;
1157         idescsi->disk = g;
1158         g->private_data = &idescsi->driver;
1159         ide_register_subdriver(drive, &idescsi_driver);
1160         err = 0;
1161         idescsi_setup(drive, idescsi);
1162         g->fops = &idescsi_ops;
1163         ide_register_region(g);
1164         err = scsi_add_host(host, &drive->gendev);
1165         if (!err) {
1166                 scsi_scan_host(host);
1167                 return 0;
1168         }
1169         /* fall through on error */
1170         ide_unregister_region(g);
1171         ide_unregister_subdriver(drive, &idescsi_driver);
1172
1173         put_disk(g);
1174 out_host_put:
1175         scsi_host_put(host);
1176         return err;
1177 }
1178
1179 static int __init init_idescsi_module(void)
1180 {
1181         return driver_register(&idescsi_driver.gen_driver);
1182 }
1183
1184 static void __exit exit_idescsi_module(void)
1185 {
1186         driver_unregister(&idescsi_driver.gen_driver);
1187 }
1188
1189 module_init(init_idescsi_module);
1190 module_exit(exit_idescsi_module);
1191 MODULE_LICENSE("GPL");