drivers/scsi/ide-scsi.c

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