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   1 /*
   2  * linux/drivers/scsi/ide-scsi.c        Version 0.9             Jul   4, 1999
   3  *
   4  * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
   5  */
   6
   7 /*
   8  * Emulation of a SCSI host adapter for IDE ATAPI devices.
   9  *
  10  * With this driver, one can use the Linux SCSI drivers instead of the
  11  * native IDE ATAPI drivers.
  12  *
  13  * Ver 0.1   Dec  3 96   Initial version.
  14  * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
  15  *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
  16  *                        to Janos Farkas for pointing this out.
  17  *                       Avoid using bitfields in structures for m68k.
  18  *                       Added Scatter/Gather and DMA support.
  19  * Ver 0.4   Dec  7 97   Add support for ATAPI PD/CD drives.
  20  *                       Use variable timeout for each command.
  21  * Ver 0.5   Jan  2 98   Fix previous PD/CD support.
  22  *                       Allow disabling of SCSI-6 to SCSI-10 transformation.
  23  * Ver 0.6   Jan 27 98   Allow disabling of SCSI command translation layer
  24  *                        for access through /dev/sg.
  25  *                       Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
  26  * Ver 0.7   Dec 04 98   Ignore commands where lun != 0 to avoid multiple
  27  *                        detection of devices with CONFIG_SCSI_MULTI_LUN
  28  * Ver 0.8   Feb 05 99   Optical media need translation too. Reverse 0.7.
  29  * Ver 0.9   Jul 04 99   Fix a bug in SG_SET_TRANSFORM.
  30  * Ver 0.91  Jun 10 02   Fix "off by one" error in transforms
  31  * Ver 0.92  Dec 31 02   Implement new SCSI mid level API
  32  */
  33
  34 #define IDESCSI_VERSION "0.92"
  35
  36 #include <linux/module.h>
  37 #include <linux/config.h>
  38 #include <linux/types.h>
  39 #include <linux/string.h>
  40 #include <linux/kernel.h>
  41 #include <linux/mm.h>
  42 #include <linux/ioport.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/errno.h>
  45 #include <linux/hdreg.h>
  46 #include <linux/slab.h>
  47 #include <linux/ide.h>
  48 #include <linux/scatterlist.h>
  49 #include <linux/delay.h>
  50
  51 #include <asm/io.h>
  52 #include <asm/bitops.h>
  53 #include <asm/uaccess.h>
  54
  55 #include <scsi/scsi.h>
  56 #include <scsi/scsi_cmnd.h>
  57 #include <scsi/scsi_device.h>
  58 #include <scsi/scsi_host.h>
  59 #include <scsi/scsi_tcq.h>
  60 #include <scsi/sg.h>
  61
  62 #define IDESCSI_DEBUG_LOG               0
  63
  64 typedef struct idescsi_pc_s {
  65         u8 c[12];                               /* Actual packet bytes */
  66         int request_transfer;                   /* Bytes to transfer */
  67         int actually_transferred;               /* Bytes actually transferred */
  68         int buffer_size;                        /* Size of our data buffer */
  69         struct request *rq;                     /* The corresponding request */
  70         u8 *buffer;                             /* Data buffer */
  71         u8 *current_position;                   /* Pointer into the above buffer */
  72         struct scatterlist *sg;                 /* Scatter gather table */
  73         int b_count;                            /* Bytes transferred from current entry */
  74         struct scsi_cmnd *scsi_cmd;             /* SCSI command */
  75         void (*done)(struct scsi_cmnd *);       /* Scsi completion routine */
  76         unsigned long flags;                    /* Status/Action flags */
  77         unsigned long timeout;                  /* Command timeout */
  78 } idescsi_pc_t;
  79
  80 /*
  81  *      Packet command status bits.
  82  */
  83 #define PC_DMA_IN_PROGRESS              0       /* 1 while DMA in progress */
  84 #define PC_WRITING                      1       /* Data direction */
  85 #define PC_TRANSFORM                    2       /* transform SCSI commands */
  86 #define PC_TIMEDOUT                     3       /* command timed out */
  87 #define PC_DMA_OK                       4       /* Use DMA */
  88
  89 /*
  90  *      SCSI command transformation layer
  91  */
  92 #define IDESCSI_TRANSFORM               0       /* Enable/Disable transformation */
  93 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
  94
  95 /*
  96  *      Log flags
  97  */
  98 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
  99
 100 typedef struct ide_scsi_obj {
 101         ide_drive_t             *drive;
 102         ide_driver_t            *driver;
 103         struct gendisk          *disk;
 104         struct Scsi_Host        *host;
 105
 106         idescsi_pc_t *pc;                       /* Current packet command */
 107         unsigned long flags;                    /* Status/Action flags */
 108         unsigned long transform;                /* SCSI cmd translation layer */
 109         unsigned long log;                      /* log flags */
 110 } idescsi_scsi_t;
 111
 112 static DECLARE_MUTEX(idescsi_ref_sem);
 113
 114 #define ide_scsi_g(disk) \
 115         container_of((disk)->private_data, struct ide_scsi_obj, driver)
 116
 117 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
 118 {
 119         struct ide_scsi_obj *scsi = NULL;
 120
 121         down(&idescsi_ref_sem);
 122         scsi = ide_scsi_g(disk);
 123         if (scsi)
 124                 scsi_host_get(scsi->host);
 125         up(&idescsi_ref_sem);
 126         return scsi;
 127 }
 128
 129 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 130 {
 131         down(&idescsi_ref_sem);
 132         scsi_host_put(scsi->host);
 133         up(&idescsi_ref_sem);
 134 }
 135
 136 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 137 {
 138         return (idescsi_scsi_t*) (&host[1]);
 139 }
 140
 141 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 142 {
 143         return scsihost_to_idescsi(ide_drive->driver_data);
 144 }
 145
 146 /*
 147  *      Per ATAPI device status bits.
 148  */
 149 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
 150
 151 /*
 152  *      ide-scsi requests.
 153  */
 154 #define IDESCSI_PC_RQ                   90
 155
 156 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
 157 {
 158         while (bcount--)
 159                 (void) HWIF(drive)->INB(IDE_DATA_REG);
 160 }
 161
 162 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
 163 {
 164         while (bcount--)
 165                 HWIF(drive)->OUTB(0, IDE_DATA_REG);
 166 }
 167
 168 /*
 169  *      PIO data transfer routines using the scatter gather table.
 170  */
 171 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 172 {
 173         int count;
 174         char *buf;
 175
 176         while (bcount) {
 177                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 178                         printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
 179                         idescsi_discard_data (drive, bcount);
 180                         return;
 181                 }
 182                 count = min(pc->sg->length - pc->b_count, bcount);
 183                 if (PageHighMem(pc->sg->page)) {
 184                         unsigned long flags;
 185
 186                         local_irq_save(flags);
 187                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
 188                                         pc->sg->offset;
 189                         drive->hwif->atapi_input_bytes(drive,
 190                                                 buf + pc->b_count, count);
 191                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 192                         local_irq_restore(flags);
 193                 } else {
 194                         buf = page_address(pc->sg->page) + pc->sg->offset;
 195                         drive->hwif->atapi_input_bytes(drive,
 196                                                 buf + pc->b_count, count);
 197                 }
 198                 bcount -= count; pc->b_count += count;
 199                 if (pc->b_count == pc->sg->length) {
 200                         pc->sg++;
 201                         pc->b_count = 0;
 202                 }
 203         }
 204 }
 205
 206 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 207 {
 208         int count;
 209         char *buf;
 210
 211         while (bcount) {
 212                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 213                         printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
 214                         idescsi_output_zeros (drive, bcount);
 215                         return;
 216                 }
 217                 count = min(pc->sg->length - pc->b_count, bcount);
 218                 if (PageHighMem(pc->sg->page)) {
 219                         unsigned long flags;
 220
 221                         local_irq_save(flags);
 222                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
 223                                                 pc->sg->offset;
 224                         drive->hwif->atapi_output_bytes(drive,
 225                                                 buf + pc->b_count, count);
 226                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 227                         local_irq_restore(flags);
 228                 } else {
 229                         buf = page_address(pc->sg->page) + pc->sg->offset;
 230                         drive->hwif->atapi_output_bytes(drive,
 231                                                 buf + pc->b_count, count);
 232                 }
 233                 bcount -= count; pc->b_count += count;
 234                 if (pc->b_count == pc->sg->length) {
 235                         pc->sg++;
 236                         pc->b_count = 0;
 237                 }
 238         }
 239 }
 240
 241 /*
 242  *      Most of the SCSI commands are supported directly by ATAPI devices.
 243  *      idescsi_transform_pc handles the few exceptions.
 244  */
 245 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
 246 {
 247         u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
 248         char *atapi_buf;
 249
 250         if (!test_bit(PC_TRANSFORM, &pc->flags))
 251                 return;
 252         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 253                 if (c[0] == READ_6 || c[0] == WRITE_6) {
 254                         c[8] = c[4];            c[5] = c[3];            c[4] = c[2];
 255                         c[3] = c[1] & 0x1f;     c[2] = 0;               c[1] &= 0xe0;
 256                         c[0] += (READ_10 - READ_6);
 257                 }
 258                 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
 259                         unsigned short new_len;
 260                         if (!scsi_buf)
 261                                 return;
 262                         if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
 263                                 return;
 264                         memset(atapi_buf, 0, pc->buffer_size + 4);
 265                         memset (c, 0, 12);
 266                         c[0] = sc[0] | 0x40;
 267                         c[1] = sc[1];
 268                         c[2] = sc[2];
 269                         new_len = sc[4] + 4;
 270                         c[8] = new_len;
 271                         c[7] = new_len >> 8;
 272                         c[9] = sc[5];
 273                         if (c[0] == MODE_SELECT_10) {
 274                                 atapi_buf[1] = scsi_buf[0];     /* Mode data length */
 275                                 atapi_buf[2] = scsi_buf[1];     /* Medium type */
 276                                 atapi_buf[3] = scsi_buf[2];     /* Device specific parameter */
 277                                 atapi_buf[7] = scsi_buf[3];     /* Block descriptor length */
 278                                 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
 279                         }
 280                         pc->buffer = atapi_buf;
 281                         pc->request_transfer += 4;
 282                         pc->buffer_size += 4;
 283                 }
 284         }
 285 }
 286
 287 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
 288 {
 289         u8 *atapi_buf = pc->buffer;
 290         u8 *sc = pc->scsi_cmd->cmnd;
 291         u8 *scsi_buf = pc->scsi_cmd->request_buffer;
 292
 293         if (!test_bit(PC_TRANSFORM, &pc->flags))
 294                 return;
 295         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 296                 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
 297                         scsi_buf[0] = atapi_buf[1];             /* Mode data length */
 298                         scsi_buf[1] = atapi_buf[2];             /* Medium type */
 299                         scsi_buf[2] = atapi_buf[3];             /* Device specific parameter */
 300                         scsi_buf[3] = atapi_buf[7];             /* Block descriptor length */
 301                         memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
 302                 }
 303                 if (pc->c[0] == INQUIRY) {
 304                         scsi_buf[2] |= 2;                       /* ansi_revision */
 305                         scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
 306                 }
 307         }
 308         if (atapi_buf && atapi_buf != scsi_buf)
 309                 kfree(atapi_buf);
 310 }
 311
 312 static void hexdump(u8 *x, int len)
 313 {
 314         int i;
 315
 316         printk("[ ");
 317         for (i = 0; i < len; i++)
 318                 printk("%x ", x[i]);
 319         printk("]\n");
 320 }
 321
 322 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
 323 {
 324         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 325         idescsi_pc_t   *pc;
 326         struct request *rq;
 327         u8             *buf;
 328
 329         /* stuff a sense request in front of our current request */
 330         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 331         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 332         buf = kmalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 333         if (pc == NULL || rq == NULL || buf == NULL) {
 334                 if (pc) kfree(pc);
 335                 if (rq) kfree(rq);
 336                 if (buf) kfree(buf);
 337                 return -ENOMEM;
 338         }
 339         memset (pc, 0, sizeof (idescsi_pc_t));
 340         memset (buf, 0, SCSI_SENSE_BUFFERSIZE);
 341         ide_init_drive_cmd(rq);
 342         rq->special = (char *) pc;
 343         pc->rq = rq;
 344         pc->buffer = buf;
 345         pc->c[0] = REQUEST_SENSE;
 346         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
 347         rq->flags = REQ_SENSE;
 348         pc->timeout = jiffies + WAIT_READY;
 349         /* NOTE! Save the failed packet command in "rq->buffer" */
 350         rq->buffer = (void *) failed_command->special;
 351         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
 352         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 353                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 354                 hexdump(pc->c, 6);
 355         }
 356         rq->rq_disk = scsi->disk;
 357         return ide_do_drive_cmd(drive, rq, ide_preempt);
 358 }
 359
 360 static int idescsi_end_request(ide_drive_t *, int, int);
 361
 362 static ide_startstop_t
 363 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 364 {
 365         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
 366                 /* force an abort */
 367                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
 368
 369         rq->errors++;
 370
 371         idescsi_end_request(drive, 0, 0);
 372
 373         return ide_stopped;
 374 }
 375
 376 static ide_startstop_t
 377 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 378 {
 379 #if IDESCSI_DEBUG_LOG
 380         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
 381                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
 382 #endif
 383         rq->errors |= ERROR_MAX;
 384
 385         idescsi_end_request(drive, 0, 0);
 386
 387         return ide_stopped;
 388 }
 389
 390 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 391 {
 392         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 393         struct request *rq = HWGROUP(drive)->rq;
 394         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
 395         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 396         struct Scsi_Host *host;
 397         u8 *scsi_buf;
 398         unsigned long flags;
 399
 400         if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
 401                 ide_end_request(drive, uptodate, nrsecs);
 402                 return 0;
 403         }
 404         ide_end_drive_cmd (drive, 0, 0);
 405         if (rq->flags & REQ_SENSE) {
 406                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
 407                 if (log) {
 408                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 409                         hexdump(pc->buffer,16);
 410                 }
 411                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
 412                 kfree(pc->buffer);
 413                 kfree(pc);
 414                 kfree(rq);
 415                 pc = opc;
 416                 rq = pc->rq;
 417                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 418                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
 419         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
 420                 if (log)
 421                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 422                                         drive->name, pc->scsi_cmd->serial_number);
 423                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 424         } else if (rq->errors >= ERROR_MAX) {
 425                 pc->scsi_cmd->result = DID_ERROR << 16;
 426                 if (log)
 427                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 428         } else if (rq->errors) {
 429                 if (log)
 430                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 431                 if (!idescsi_check_condition(drive, rq))
 432                         /* we started a request sense, so we'll be back, exit for now */
 433                         return 0;
 434                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 435         } else {
 436                 pc->scsi_cmd->result = DID_OK << 16;
 437                 idescsi_transform_pc2 (drive, pc);
 438                 if (log) {
 439                         printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
 440                         if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
 441                                 printk(", rst = ");
 442                                 scsi_buf = pc->scsi_cmd->request_buffer;
 443                                 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
 444                         } else printk("\n");
 445                 }
 446         }
 447         host = pc->scsi_cmd->device->host;
 448         spin_lock_irqsave(host->host_lock, flags);
 449         pc->done(pc->scsi_cmd);
 450         spin_unlock_irqrestore(host->host_lock, flags);
 451         kfree(pc);
 452         kfree(rq);
 453         scsi->pc = NULL;
 454         return 0;
 455 }
 456
 457 static inline unsigned long get_timeout(idescsi_pc_t *pc)
 458 {
 459         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 460 }
 461
 462 static int idescsi_expiry(ide_drive_t *drive)
 463 {
 464         idescsi_scsi_t *scsi = drive->driver_data;
 465         idescsi_pc_t   *pc   = scsi->pc;
 466
 467 #if IDESCSI_DEBUG_LOG
 468         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
 469 #endif
 470         set_bit(PC_TIMEDOUT, &pc->flags);
 471
 472         return 0;                                       /* we do not want the ide subsystem to retry */
 473 }
 474
 475 /*
 476  *      Our interrupt handler.
 477  */
 478 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 479 {
 480         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 481         idescsi_pc_t *pc=scsi->pc;
 482         struct request *rq = pc->rq;
 483         atapi_bcount_t bcount;
 484         atapi_status_t status;
 485         atapi_ireason_t ireason;
 486         atapi_feature_t feature;
 487
 488         unsigned int temp;
 489
 490 #if IDESCSI_DEBUG_LOG
 491         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
 492 #endif /* IDESCSI_DEBUG_LOG */
 493
 494         if (test_bit(PC_TIMEDOUT, &pc->flags)){
 495 #if IDESCSI_DEBUG_LOG
 496                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
 497                                 pc->scsi_cmd->serial_number, jiffies);
 498 #endif
 499                 /* end this request now - scsi should retry it*/
 500                 idescsi_end_request (drive, 1, 0);
 501                 return ide_stopped;
 502         }
 503         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
 504 #if IDESCSI_DEBUG_LOG
 505                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
 506 #endif /* IDESCSI_DEBUG_LOG */
 507                 pc->actually_transferred=pc->request_transfer;
 508                 (void) HWIF(drive)->ide_dma_end(drive);
 509         }
 510
 511         feature.all = 0;
 512         /* Clear the interrupt */
 513         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
 514
 515         if (!status.b.drq) {
 516                 /* No more interrupts */
 517                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 518                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
 519                 local_irq_enable();
 520                 if (status.b.check)
 521                         rq->errors++;
 522                 idescsi_end_request (drive, 1, 0);
 523                 return ide_stopped;
 524         }
 525         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
 526         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
 527         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 528
 529         if (ireason.b.cod) {
 530                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
 531                 return ide_do_reset (drive);
 532         }
 533         if (ireason.b.io) {
 534                 temp = pc->actually_transferred + bcount.all;
 535                 if (temp > pc->request_transfer) {
 536                         if (temp > pc->buffer_size) {
 537                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
 538                                         "send us more data than expected "
 539                                         "- discarding data\n");
 540                                 temp = pc->buffer_size - pc->actually_transferred;
 541                                 if (temp) {
 542                                         clear_bit(PC_WRITING, &pc->flags);
 543                                         if (pc->sg)
 544                                                 idescsi_input_buffers(drive, pc, temp);
 545                                         else
 546                                                 drive->hwif->atapi_input_bytes(drive, pc->current_position, temp);
 547                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
 548                                 }
 549                                 pc->actually_transferred += temp;
 550                                 pc->current_position += temp;
 551                                 idescsi_discard_data(drive, bcount.all - temp);
 552                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 553                                 return ide_started;
 554                         }
 555 #if IDESCSI_DEBUG_LOG
 556                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
 557 #endif /* IDESCSI_DEBUG_LOG */
 558                 }
 559         }
 560         if (ireason.b.io) {
 561                 clear_bit(PC_WRITING, &pc->flags);
 562                 if (pc->sg)
 563                         idescsi_input_buffers(drive, pc, bcount.all);
 564                 else
 565                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
 566         } else {
 567                 set_bit(PC_WRITING, &pc->flags);
 568                 if (pc->sg)
 569                         idescsi_output_buffers (drive, pc, bcount.all);
 570                 else
 571                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
 572         }
 573         /* Update the current position */
 574         pc->actually_transferred += bcount.all;
 575         pc->current_position += bcount.all;
 576
 577         /* And set the interrupt handler again */
 578         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 579         return ide_started;
 580 }
 581
 582 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 583 {
 584         ide_hwif_t *hwif = drive->hwif;
 585         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 586         idescsi_pc_t *pc = scsi->pc;
 587         atapi_ireason_t ireason;
 588         ide_startstop_t startstop;
 589
 590         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
 591                 printk(KERN_ERR "ide-scsi: Strange, packet command "
 592                         "initiated yet DRQ isn't asserted\n");
 593                 return startstop;
 594         }
 595         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 596         if (!ireason.b.cod || ireason.b.io) {
 597                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
 598                                 "issuing a packet command\n");
 599                 return ide_do_reset (drive);
 600         }
 601         if (HWGROUP(drive)->handler != NULL)
 602                 BUG();
 603         /* Set the interrupt routine */
 604         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 605         /* Send the actual packet */
 606         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
 607         if (test_bit (PC_DMA_OK, &pc->flags)) {
 608                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
 609                 hwif->dma_start(drive);
 610         }
 611         return ide_started;
 612 }
 613
 614 static inline int idescsi_set_direction(idescsi_pc_t *pc)
 615 {
 616         switch (pc->c[0]) {
 617                 case READ_6: case READ_10: case READ_12:
 618                         clear_bit(PC_WRITING, &pc->flags);
 619                         return 0;
 620                 case WRITE_6: case WRITE_10: case WRITE_12:
 621                         set_bit(PC_WRITING, &pc->flags);
 622                         return 0;
 623                 default:
 624                         return 1;
 625         }
 626 }
 627
 628 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
 629 {
 630         ide_hwif_t *hwif = drive->hwif;
 631         struct scatterlist *sg, *scsi_sg;
 632         int segments;
 633
 634         if (!pc->request_transfer || pc->request_transfer % 1024)
 635                 return 1;
 636
 637         if (idescsi_set_direction(pc))
 638                 return 1;
 639
 640         sg = hwif->sg_table;
 641         scsi_sg = pc->scsi_cmd->request_buffer;
 642         segments = pc->scsi_cmd->use_sg;
 643
 644         if (segments > hwif->sg_max_nents)
 645                 return 1;
 646
 647         if (!segments) {
 648                 hwif->sg_nents = 1;
 649                 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
 650         } else {
 651                 hwif->sg_nents = segments;
 652                 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 653         }
 654
 655         return 0;
 656 }
 657
 658 /*
 659  *      Issue a packet command
 660  */
 661 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
 662 {
 663         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 664         ide_hwif_t *hwif = drive->hwif;
 665         atapi_feature_t feature;
 666         atapi_bcount_t bcount;
 667
 668         scsi->pc=pc;                                                    /* Set the current packet command */
 669         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
 670         pc->current_position=pc->buffer;
 671         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
 672
 673         feature.all = 0;
 674         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
 675                 hwif->sg_mapped = 1;
 676                 feature.b.dma = !hwif->dma_setup(drive);
 677                 hwif->sg_mapped = 0;
 678         }
 679
 680         SELECT_DRIVE(drive);
 681         if (IDE_CONTROL_REG)
 682                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
 683
 684         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
 685         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
 686         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
 687
 688         if (feature.b.dma)
 689                 set_bit(PC_DMA_OK, &pc->flags);
 690
 691         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
 692                 if (HWGROUP(drive)->handler != NULL)
 693                         BUG();
 694                 ide_set_handler(drive, &idescsi_transfer_pc,
 695                                 get_timeout(pc), idescsi_expiry);
 696                 /* Issue the packet command */
 697                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 698                 return ide_started;
 699         } else {
 700                 /* Issue the packet command */
 701                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 702                 return idescsi_transfer_pc(drive);
 703         }
 704 }
 705
 706 /*
 707  *      idescsi_do_request is our request handling function.
 708  */
 709 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 710 {
 711 #if IDESCSI_DEBUG_LOG
 712         printk (KERN_INFO "rq_status: %d, dev: %s, cmd: %x, errors: %d\n",rq->rq_status, rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
 713         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
 714 #endif /* IDESCSI_DEBUG_LOG */
 715
 716         if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
 717                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
 718         }
 719         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 720         idescsi_end_request (drive, 0, 0);
 721         return ide_stopped;
 722 }
 723
 724 static void idescsi_add_settings(ide_drive_t *drive)
 725 {
 726         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 727
 728 /*
 729  *                      drive   setting name    read/write      ioctl   ioctl           data type       min     max     mul_factor      div_factor      data pointer            set function
 730  */
 731         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 732         ide_add_setting(drive,  "bios_head",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 733         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 734         ide_add_setting(drive,  "transform",    SETTING_RW,     -1,     -1,             TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 735         ide_add_setting(drive,  "log",          SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 736 }
 737
 738 /*
 739  *      Driver initialization.
 740  */
 741 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 742 {
 743         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 744                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 745         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
 746         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 747 #if IDESCSI_DEBUG_LOG
 748         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 749 #endif /* IDESCSI_DEBUG_LOG */
 750         idescsi_add_settings(drive);
 751 }
 752
 753 static int ide_scsi_remove(struct device *dev)
 754 {
 755         ide_drive_t *drive = to_ide_device(dev);
 756         struct Scsi_Host *scsihost = drive->driver_data;
 757         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 758         struct gendisk *g = scsi->disk;
 759
 760         ide_unregister_subdriver(drive, scsi->driver);
 761
 762         ide_unregister_region(g);
 763
 764         drive->driver_data = NULL;
 765         g->private_data = NULL;
 766         put_disk(g);
 767
 768         scsi_remove_host(scsihost);
 769         ide_scsi_put(scsi);
 770
 771         return 0;
 772 }
 773
 774 static int ide_scsi_probe(struct device *);
 775
 776 #ifdef CONFIG_PROC_FS
 777 static ide_proc_entry_t idescsi_proc[] = {
 778         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 779         { NULL, 0, NULL, NULL }
 780 };
 781 #else
 782 # define idescsi_proc   NULL
 783 #endif
 784
 785 static ide_driver_t idescsi_driver = {
 786         .owner                  = THIS_MODULE,
 787         .gen_driver = {
 788                 .name           = "ide-scsi",
 789                 .bus            = &ide_bus_type,
 790                 .probe          = ide_scsi_probe,
 791                 .remove         = ide_scsi_remove,
 792         },
 793         .version                = IDESCSI_VERSION,
 794         .media                  = ide_scsi,
 795         .supports_dsc_overlap   = 0,
 796         .proc                   = idescsi_proc,
 797         .do_request             = idescsi_do_request,
 798         .end_request            = idescsi_end_request,
 799         .error                  = idescsi_atapi_error,
 800         .abort                  = idescsi_atapi_abort,
 801 };
 802
 803 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 804 {
 805         struct gendisk *disk = inode->i_bdev->bd_disk;
 806         struct ide_scsi_obj *scsi;
 807         ide_drive_t *drive;
 808
 809         if (!(scsi = ide_scsi_get(disk)))
 810                 return -ENXIO;
 811
 812         drive = scsi->drive;
 813
 814         drive->usage++;
 815
 816         return 0;
 817 }
 818
 819 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 820 {
 821         struct gendisk *disk = inode->i_bdev->bd_disk;
 822         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 823         ide_drive_t *drive = scsi->drive;
 824
 825         drive->usage--;
 826
 827         ide_scsi_put(scsi);
 828
 829         return 0;
 830 }
 831
 832 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 833                         unsigned int cmd, unsigned long arg)
 834 {
 835         struct block_device *bdev = inode->i_bdev;
 836         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 837         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 838 }
 839
 840 static struct block_device_operations idescsi_ops = {
 841         .owner          = THIS_MODULE,
 842         .open           = idescsi_ide_open,
 843         .release        = idescsi_ide_release,
 844         .ioctl          = idescsi_ide_ioctl,
 845 };
 846
 847 static int idescsi_slave_configure(struct scsi_device * sdp)
 848 {
 849         /* Configure detected device */
 850         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 851         return 0;
 852 }
 853
 854 static const char *idescsi_info (struct Scsi_Host *host)
 855 {
 856         return "SCSI host adapter emulation for IDE ATAPI devices";
 857 }
 858
 859 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 860 {
 861         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 862
 863         if (cmd == SG_SET_TRANSFORM) {
 864                 if (arg)
 865                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 866                 else
 867                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 868                 return 0;
 869         } else if (cmd == SG_GET_TRANSFORM)
 870                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 871         return -EINVAL;
 872 }
 873
 874 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
 875 {
 876         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 877
 878         /* this was a layering violation and we can't support it
 879            anymore, sorry. */
 880 #if 0
 881         struct gendisk *disk = cmd->request->rq_disk;
 882
 883         if (disk) {
 884                 struct Scsi_Device_Template **p = disk->private_data;
 885                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
 886                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 887         }
 888 #endif
 889         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
 890 }
 891
 892 static int idescsi_queue (struct scsi_cmnd *cmd,
 893                 void (*done)(struct scsi_cmnd *))
 894 {
 895         struct Scsi_Host *host = cmd->device->host;
 896         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 897         ide_drive_t *drive = scsi->drive;
 898         struct request *rq = NULL;
 899         idescsi_pc_t *pc = NULL;
 900
 901         if (!drive) {
 902                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 903                 goto abort;
 904         }
 905         scsi = drive_to_idescsi(drive);
 906         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 907         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 908         if (rq == NULL || pc == NULL) {
 909                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 910                 goto abort;
 911         }
 912
 913         memset (pc->c, 0, 12);
 914         pc->flags = 0;
 915         pc->rq = rq;
 916         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 917         if (cmd->use_sg) {
 918                 pc->buffer = NULL;
 919                 pc->sg = cmd->request_buffer;
 920         } else {
 921                 pc->buffer = cmd->request_buffer;
 922                 pc->sg = NULL;
 923         }
 924         pc->b_count = 0;
 925         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
 926         pc->scsi_cmd = cmd;
 927         pc->done = done;
 928         pc->timeout = jiffies + cmd->timeout_per_command;
 929
 930         if (should_transform(drive, cmd))
 931                 set_bit(PC_TRANSFORM, &pc->flags);
 932         idescsi_transform_pc1 (drive, pc);
 933
 934         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 935                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 936                 hexdump(cmd->cmnd, cmd->cmd_len);
 937                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 938                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 939                         hexdump(pc->c, 12);
 940                 }
 941         }
 942
 943         ide_init_drive_cmd (rq);
 944         rq->special = (char *) pc;
 945         rq->flags = REQ_SPECIAL;
 946         spin_unlock_irq(host->host_lock);
 947         rq->rq_disk = scsi->disk;
 948         (void) ide_do_drive_cmd (drive, rq, ide_end);
 949         spin_lock_irq(host->host_lock);
 950         return 0;
 951 abort:
 952         if (pc) kfree (pc);
 953         if (rq) kfree (rq);
 954         cmd->result = DID_ERROR << 16;
 955         done(cmd);
 956         return 0;
 957 }
 958
 959 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 960 {
 961         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 962         ide_drive_t    *drive = scsi->drive;
 963         int             busy;
 964         int             ret   = FAILED;
 965
 966         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 967
 968         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 969                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 970
 971         if (!drive) {
 972                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 973                 WARN_ON(1);
 974                 goto no_drive;
 975         }
 976
 977         /* First give it some more time, how much is "right" is hard to say :-( */
 978
 979         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 980         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 981                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 982
 983         spin_lock_irq(&ide_lock);
 984
 985         /* If there is no pc running we're done (our interrupt took care of it) */
 986         if (!scsi->pc) {
 987                 ret = SUCCESS;
 988                 goto ide_unlock;
 989         }
 990
 991         /* It's somewhere in flight. Does ide subsystem agree? */
 992         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 993             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 994                 /*
 995                  * FIXME - not sure this condition can ever occur
 996                  */
 997                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 998
 999                 if (scsi->pc->rq->flags & REQ_SENSE)
1000                         kfree(scsi->pc->buffer);
1001                 kfree(scsi->pc->rq);
1002                 kfree(scsi->pc);
1003                 scsi->pc = NULL;
1004
1005                 ret = SUCCESS;
1006         }
1007
1008 ide_unlock:
1009         spin_unlock_irq(&ide_lock);
1010 no_drive:
1011         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1012                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
1013
1014         return ret;
1015 }
1016
1017 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
1018 {
1019         struct request *req;
1020         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
1021         ide_drive_t    *drive = scsi->drive;
1022         int             ready = 0;
1023         int             ret   = SUCCESS;
1024
1025         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1026
1027         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1028                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1029
1030         if (!drive) {
1031                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1032                 WARN_ON(1);
1033                 return FAILED;
1034         }
1035
1036         spin_lock_irq(cmd->device->host->host_lock);
1037         spin_lock(&ide_lock);
1038
1039         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1040                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1041                 spin_unlock(&ide_lock);
1042                 spin_unlock_irq(cmd->device->host->host_lock);
1043                 return FAILED;
1044         }
1045
1046         /* kill current request */
1047         blkdev_dequeue_request(req);
1048         end_that_request_last(req);
1049         if (req->flags & REQ_SENSE)
1050                 kfree(scsi->pc->buffer);
1051         kfree(scsi->pc);
1052         scsi->pc = NULL;
1053         kfree(req);
1054
1055         /* now nuke the drive queue */
1056         while ((req = elv_next_request(drive->queue))) {
1057                 blkdev_dequeue_request(req);
1058                 end_that_request_last(req);
1059         }
1060
1061         HWGROUP(drive)->rq = NULL;
1062         HWGROUP(drive)->handler = NULL;
1063         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
1064         spin_unlock(&ide_lock);
1065
1066         ide_do_reset(drive);
1067
1068         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1069
1070         do {
1071                 spin_unlock_irq(cmd->device->host->host_lock);
1072                 msleep(50);
1073                 spin_lock_irq(cmd->device->host->host_lock);
1074         } while ( HWGROUP(drive)->handler );
1075
1076         ready = drive_is_ready(drive);
1077         HWGROUP(drive)->busy--;
1078         if (!ready) {
1079                 printk (KERN_ERR "ide-scsi: reset failed!\n");
1080                 ret = FAILED;
1081         }
1082
1083         spin_unlock_irq(cmd->device->host->host_lock);
1084         return ret;
1085 }
1086
1087 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1088                 sector_t capacity, int *parm)
1089 {
1090         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1091         ide_drive_t *drive = idescsi->drive;
1092
1093         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1094                 parm[0] = drive->bios_head;
1095                 parm[1] = drive->bios_sect;
1096                 parm[2] = drive->bios_cyl;
1097         }
1098         return 0;
1099 }
1100
1101 static struct scsi_host_template idescsi_template = {
1102         .module                 = THIS_MODULE,
1103         .name                   = "idescsi",
1104         .info                   = idescsi_info,
1105         .slave_configure        = idescsi_slave_configure,
1106         .ioctl                  = idescsi_ioctl,
1107         .queuecommand           = idescsi_queue,
1108         .eh_abort_handler       = idescsi_eh_abort,
1109         .eh_host_reset_handler  = idescsi_eh_reset,
1110         .bios_param             = idescsi_bios,
1111         .can_queue              = 40,
1112         .this_id                = -1,
1113         .sg_tablesize           = 256,
1114         .cmd_per_lun            = 5,
1115         .max_sectors            = 128,
1116         .use_clustering         = DISABLE_CLUSTERING,
1117         .emulated               = 1,
1118         .proc_name              = "ide-scsi",
1119 };
1120
1121 static int ide_scsi_probe(struct device *dev)
1122 {
1123         ide_drive_t *drive = to_ide_device(dev);
1124         idescsi_scsi_t *idescsi;
1125         struct Scsi_Host *host;
1126         struct gendisk *g;
1127         static int warned;
1128         int err = -ENOMEM;
1129
1130         if (!warned && drive->media == ide_cdrom) {
1131                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1132                 warned = 1;
1133         }
1134
1135         if (!strstr("ide-scsi", drive->driver_req) ||
1136             !drive->present ||
1137             drive->media == ide_disk ||
1138             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1139                 return -ENODEV;
1140
1141         g = alloc_disk(1 << PARTN_BITS);
1142         if (!g)
1143                 goto out_host_put;
1144
1145         ide_init_disk(g, drive);
1146
1147         host->max_id = 1;
1148
1149 #if IDESCSI_DEBUG_LOG
1150         if (drive->id->last_lun)
1151                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1152 #endif
1153         if ((drive->id->last_lun & 0x7) != 7)
1154                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1155         else
1156                 host->max_lun = 1;
1157
1158         drive->driver_data = host;
1159         idescsi = scsihost_to_idescsi(host);
1160         idescsi->drive = drive;
1161         idescsi->driver = &idescsi_driver;
1162         idescsi->host = host;
1163         idescsi->disk = g;
1164         g->private_data = &idescsi->driver;
1165         ide_register_subdriver(drive, &idescsi_driver);
1166         err = 0;
1167         idescsi_setup(drive, idescsi);
1168         g->fops = &idescsi_ops;
1169         ide_register_region(g);
1170         err = scsi_add_host(host, &drive->gendev);
1171         if (!err) {
1172                 scsi_scan_host(host);
1173                 return 0;
1174         }
1175         /* fall through on error */
1176         ide_unregister_region(g);
1177         ide_unregister_subdriver(drive, &idescsi_driver);
1178
1179         put_disk(g);
1180 out_host_put:
1181         scsi_host_put(host);
1182         return err;
1183 }
1184
1185 static int __init init_idescsi_module(void)
1186 {
1187         return driver_register(&idescsi_driver.gen_driver);
1188 }
1189
1190 static void __exit exit_idescsi_module(void)
1191 {
1192         driver_unregister(&idescsi_driver.gen_driver);
1193 }
1194
1195 module_init(init_idescsi_module);
1196 module_exit(exit_idescsi_module);
1197 MODULE_LICENSE("GPL");