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   1 /*
   2  * linux/drivers/scsi/ide-scsi.c        Version 0.9             Jul   4, 1999
   3  *
   4  * Copyright (C) 1996 - 1999 Gadi Oxman <gadio@netvision.net.il>
   5  */
   6
   7 /*
   8  * Emulation of a SCSI host adapter for IDE ATAPI devices.
   9  *
  10  * With this driver, one can use the Linux SCSI drivers instead of the
  11  * native IDE ATAPI drivers.
  12  *
  13  * Ver 0.1   Dec  3 96   Initial version.
  14  * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
  15  *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
  16  *                        to Janos Farkas for pointing this out.
  17  *                       Avoid using bitfields in structures for m68k.
  18  *                       Added Scatter/Gather and DMA support.
  19  * Ver 0.4   Dec  7 97   Add support for ATAPI PD/CD drives.
  20  *                       Use variable timeout for each command.
  21  * Ver 0.5   Jan  2 98   Fix previous PD/CD support.
  22  *                       Allow disabling of SCSI-6 to SCSI-10 transformation.
  23  * Ver 0.6   Jan 27 98   Allow disabling of SCSI command translation layer
  24  *                        for access through /dev/sg.
  25  *                       Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
  26  * Ver 0.7   Dec 04 98   Ignore commands where lun != 0 to avoid multiple
  27  *                        detection of devices with CONFIG_SCSI_MULTI_LUN
  28  * Ver 0.8   Feb 05 99   Optical media need translation too. Reverse 0.7.
  29  * Ver 0.9   Jul 04 99   Fix a bug in SG_SET_TRANSFORM.
  30  * Ver 0.91  Jun 10 02   Fix "off by one" error in transforms
  31  * Ver 0.92  Dec 31 02   Implement new SCSI mid level API
  32  */
  33
  34 #define IDESCSI_VERSION "0.92"
  35
  36 #include <linux/module.h>
  37 #include <linux/types.h>
  38 #include <linux/string.h>
  39 #include <linux/kernel.h>
  40 #include <linux/mm.h>
  41 #include <linux/ioport.h>
  42 #include <linux/blkdev.h>
  43 #include <linux/errno.h>
  44 #include <linux/hdreg.h>
  45 #include <linux/slab.h>
  46 #include <linux/ide.h>
  47 #include <linux/scatterlist.h>
  48 #include <linux/delay.h>
  49 #include <linux/mutex.h>
  50
  51 #include <asm/io.h>
  52 #include <asm/bitops.h>
  53 #include <asm/uaccess.h>
  54
  55 #include <scsi/scsi.h>
  56 #include <scsi/scsi_cmnd.h>
  57 #include <scsi/scsi_device.h>
  58 #include <scsi/scsi_host.h>
  59 #include <scsi/scsi_tcq.h>
  60 #include <scsi/sg.h>
  61
  62 #define IDESCSI_DEBUG_LOG               0
  63
  64 typedef struct idescsi_pc_s {
  65         u8 c[12];                               /* Actual packet bytes */
  66         int request_transfer;                   /* Bytes to transfer */
  67         int actually_transferred;               /* Bytes actually transferred */
  68         int buffer_size;                        /* Size of our data buffer */
  69         struct request *rq;                     /* The corresponding request */
  70         u8 *buffer;                             /* Data buffer */
  71         u8 *current_position;                   /* Pointer into the above buffer */
  72         struct scatterlist *sg;                 /* Scatter gather table */
  73         int b_count;                            /* Bytes transferred from current entry */
  74         struct scsi_cmnd *scsi_cmd;             /* SCSI command */
  75         void (*done)(struct scsi_cmnd *);       /* Scsi completion routine */
  76         unsigned long flags;                    /* Status/Action flags */
  77         unsigned long timeout;                  /* Command timeout */
  78 } idescsi_pc_t;
  79
  80 /*
  81  *      Packet command status bits.
  82  */
  83 #define PC_DMA_IN_PROGRESS              0       /* 1 while DMA in progress */
  84 #define PC_WRITING                      1       /* Data direction */
  85 #define PC_TRANSFORM                    2       /* transform SCSI commands */
  86 #define PC_TIMEDOUT                     3       /* command timed out */
  87 #define PC_DMA_OK                       4       /* Use DMA */
  88
  89 /*
  90  *      SCSI command transformation layer
  91  */
  92 #define IDESCSI_TRANSFORM               0       /* Enable/Disable transformation */
  93 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
  94
  95 /*
  96  *      Log flags
  97  */
  98 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
  99
 100 typedef struct ide_scsi_obj {
 101         ide_drive_t             *drive;
 102         ide_driver_t            *driver;
 103         struct gendisk          *disk;
 104         struct Scsi_Host        *host;
 105
 106         idescsi_pc_t *pc;                       /* Current packet command */
 107         unsigned long flags;                    /* Status/Action flags */
 108         unsigned long transform;                /* SCSI cmd translation layer */
 109         unsigned long log;                      /* log flags */
 110 } idescsi_scsi_t;
 111
 112 static DEFINE_MUTEX(idescsi_ref_mutex);
 113 static int idescsi_nocd;                        /* Set by module param to skip cd */
 114
 115 #define ide_scsi_g(disk) \
 116         container_of((disk)->private_data, struct ide_scsi_obj, driver)
 117
 118 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
 119 {
 120         struct ide_scsi_obj *scsi = NULL;
 121
 122         mutex_lock(&idescsi_ref_mutex);
 123         scsi = ide_scsi_g(disk);
 124         if (scsi)
 125                 scsi_host_get(scsi->host);
 126         mutex_unlock(&idescsi_ref_mutex);
 127         return scsi;
 128 }
 129
 130 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 131 {
 132         mutex_lock(&idescsi_ref_mutex);
 133         scsi_host_put(scsi->host);
 134         mutex_unlock(&idescsi_ref_mutex);
 135 }
 136
 137 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 138 {
 139         return (idescsi_scsi_t*) (&host[1]);
 140 }
 141
 142 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 143 {
 144         return scsihost_to_idescsi(ide_drive->driver_data);
 145 }
 146
 147 /*
 148  *      Per ATAPI device status bits.
 149  */
 150 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
 151
 152 /*
 153  *      ide-scsi requests.
 154  */
 155 #define IDESCSI_PC_RQ                   90
 156
 157 static void idescsi_discard_data (ide_drive_t *drive, unsigned int bcount)
 158 {
 159         while (bcount--)
 160                 (void) HWIF(drive)->INB(IDE_DATA_REG);
 161 }
 162
 163 static void idescsi_output_zeros (ide_drive_t *drive, unsigned int bcount)
 164 {
 165         while (bcount--)
 166                 HWIF(drive)->OUTB(0, IDE_DATA_REG);
 167 }
 168
 169 /*
 170  *      PIO data transfer routines using the scatter gather table.
 171  */
 172 static void idescsi_input_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 173 {
 174         int count;
 175         char *buf;
 176
 177         while (bcount) {
 178                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 179                         printk (KERN_ERR "ide-scsi: scatter gather table too small, discarding data\n");
 180                         idescsi_discard_data (drive, bcount);
 181                         return;
 182                 }
 183                 count = min(pc->sg->length - pc->b_count, bcount);
 184                 if (PageHighMem(pc->sg->page)) {
 185                         unsigned long flags;
 186
 187                         local_irq_save(flags);
 188                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
 189                                         pc->sg->offset;
 190                         drive->hwif->atapi_input_bytes(drive,
 191                                                 buf + pc->b_count, count);
 192                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 193                         local_irq_restore(flags);
 194                 } else {
 195                         buf = page_address(pc->sg->page) + pc->sg->offset;
 196                         drive->hwif->atapi_input_bytes(drive,
 197                                                 buf + pc->b_count, count);
 198                 }
 199                 bcount -= count; pc->b_count += count;
 200                 if (pc->b_count == pc->sg->length) {
 201                         pc->sg++;
 202                         pc->b_count = 0;
 203                 }
 204         }
 205 }
 206
 207 static void idescsi_output_buffers (ide_drive_t *drive, idescsi_pc_t *pc, unsigned int bcount)
 208 {
 209         int count;
 210         char *buf;
 211
 212         while (bcount) {
 213                 if (pc->sg - (struct scatterlist *) pc->scsi_cmd->request_buffer > pc->scsi_cmd->use_sg) {
 214                         printk (KERN_ERR "ide-scsi: scatter gather table too small, padding with zeros\n");
 215                         idescsi_output_zeros (drive, bcount);
 216                         return;
 217                 }
 218                 count = min(pc->sg->length - pc->b_count, bcount);
 219                 if (PageHighMem(pc->sg->page)) {
 220                         unsigned long flags;
 221
 222                         local_irq_save(flags);
 223                         buf = kmap_atomic(pc->sg->page, KM_IRQ0) +
 224                                                 pc->sg->offset;
 225                         drive->hwif->atapi_output_bytes(drive,
 226                                                 buf + pc->b_count, count);
 227                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 228                         local_irq_restore(flags);
 229                 } else {
 230                         buf = page_address(pc->sg->page) + pc->sg->offset;
 231                         drive->hwif->atapi_output_bytes(drive,
 232                                                 buf + pc->b_count, count);
 233                 }
 234                 bcount -= count; pc->b_count += count;
 235                 if (pc->b_count == pc->sg->length) {
 236                         pc->sg++;
 237                         pc->b_count = 0;
 238                 }
 239         }
 240 }
 241
 242 /*
 243  *      Most of the SCSI commands are supported directly by ATAPI devices.
 244  *      idescsi_transform_pc handles the few exceptions.
 245  */
 246 static inline void idescsi_transform_pc1 (ide_drive_t *drive, idescsi_pc_t *pc)
 247 {
 248         u8 *c = pc->c, *scsi_buf = pc->buffer, *sc = pc->scsi_cmd->cmnd;
 249         char *atapi_buf;
 250
 251         if (!test_bit(PC_TRANSFORM, &pc->flags))
 252                 return;
 253         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 254                 if (c[0] == READ_6 || c[0] == WRITE_6) {
 255                         c[8] = c[4];            c[5] = c[3];            c[4] = c[2];
 256                         c[3] = c[1] & 0x1f;     c[2] = 0;               c[1] &= 0xe0;
 257                         c[0] += (READ_10 - READ_6);
 258                 }
 259                 if (c[0] == MODE_SENSE || c[0] == MODE_SELECT) {
 260                         unsigned short new_len;
 261                         if (!scsi_buf)
 262                                 return;
 263                         if ((atapi_buf = kmalloc(pc->buffer_size + 4, GFP_ATOMIC)) == NULL)
 264                                 return;
 265                         memset(atapi_buf, 0, pc->buffer_size + 4);
 266                         memset (c, 0, 12);
 267                         c[0] = sc[0] | 0x40;
 268                         c[1] = sc[1];
 269                         c[2] = sc[2];
 270                         new_len = sc[4] + 4;
 271                         c[8] = new_len;
 272                         c[7] = new_len >> 8;
 273                         c[9] = sc[5];
 274                         if (c[0] == MODE_SELECT_10) {
 275                                 atapi_buf[1] = scsi_buf[0];     /* Mode data length */
 276                                 atapi_buf[2] = scsi_buf[1];     /* Medium type */
 277                                 atapi_buf[3] = scsi_buf[2];     /* Device specific parameter */
 278                                 atapi_buf[7] = scsi_buf[3];     /* Block descriptor length */
 279                                 memcpy(atapi_buf + 8, scsi_buf + 4, pc->buffer_size - 4);
 280                         }
 281                         pc->buffer = atapi_buf;
 282                         pc->request_transfer += 4;
 283                         pc->buffer_size += 4;
 284                 }
 285         }
 286 }
 287
 288 static inline void idescsi_transform_pc2 (ide_drive_t *drive, idescsi_pc_t *pc)
 289 {
 290         u8 *atapi_buf = pc->buffer;
 291         u8 *sc = pc->scsi_cmd->cmnd;
 292         u8 *scsi_buf = pc->scsi_cmd->request_buffer;
 293
 294         if (!test_bit(PC_TRANSFORM, &pc->flags))
 295                 return;
 296         if (drive->media == ide_cdrom || drive->media == ide_optical) {
 297                 if (pc->c[0] == MODE_SENSE_10 && sc[0] == MODE_SENSE) {
 298                         scsi_buf[0] = atapi_buf[1];             /* Mode data length */
 299                         scsi_buf[1] = atapi_buf[2];             /* Medium type */
 300                         scsi_buf[2] = atapi_buf[3];             /* Device specific parameter */
 301                         scsi_buf[3] = atapi_buf[7];             /* Block descriptor length */
 302                         memcpy(scsi_buf + 4, atapi_buf + 8, pc->request_transfer - 8);
 303                 }
 304                 if (pc->c[0] == INQUIRY) {
 305                         scsi_buf[2] |= 2;                       /* ansi_revision */
 306                         scsi_buf[3] = (scsi_buf[3] & 0xf0) | 2; /* response data format */
 307                 }
 308         }
 309         if (atapi_buf && atapi_buf != scsi_buf)
 310                 kfree(atapi_buf);
 311 }
 312
 313 static void hexdump(u8 *x, int len)
 314 {
 315         int i;
 316
 317         printk("[ ");
 318         for (i = 0; i < len; i++)
 319                 printk("%x ", x[i]);
 320         printk("]\n");
 321 }
 322
 323 static int idescsi_check_condition(ide_drive_t *drive, struct request *failed_command)
 324 {
 325         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 326         idescsi_pc_t   *pc;
 327         struct request *rq;
 328         u8             *buf;
 329
 330         /* stuff a sense request in front of our current request */
 331         pc = kzalloc(sizeof(idescsi_pc_t), GFP_ATOMIC);
 332         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 333         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 334         if (!pc || !rq || !buf) {
 335                 kfree(buf);
 336                 kfree(rq);
 337                 kfree(pc);
 338                 return -ENOMEM;
 339         }
 340         ide_init_drive_cmd(rq);
 341         rq->special = (char *) pc;
 342         pc->rq = rq;
 343         pc->buffer = buf;
 344         pc->c[0] = REQUEST_SENSE;
 345         pc->c[4] = pc->request_transfer = pc->buffer_size = SCSI_SENSE_BUFFERSIZE;
 346         rq->cmd_type = REQ_TYPE_SENSE;
 347         pc->timeout = jiffies + WAIT_READY;
 348         /* NOTE! Save the failed packet command in "rq->buffer" */
 349         rq->buffer = (void *) failed_command->special;
 350         pc->scsi_cmd = ((idescsi_pc_t *) failed_command->special)->scsi_cmd;
 351         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 352                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 353                 hexdump(pc->c, 6);
 354         }
 355         rq->rq_disk = scsi->disk;
 356         return ide_do_drive_cmd(drive, rq, ide_preempt);
 357 }
 358
 359 static int idescsi_end_request(ide_drive_t *, int, int);
 360
 361 static ide_startstop_t
 362 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 363 {
 364         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
 365                 /* force an abort */
 366                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
 367
 368         rq->errors++;
 369
 370         idescsi_end_request(drive, 0, 0);
 371
 372         return ide_stopped;
 373 }
 374
 375 static ide_startstop_t
 376 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 377 {
 378 #if IDESCSI_DEBUG_LOG
 379         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
 380                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
 381 #endif
 382         rq->errors |= ERROR_MAX;
 383
 384         idescsi_end_request(drive, 0, 0);
 385
 386         return ide_stopped;
 387 }
 388
 389 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 390 {
 391         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 392         struct request *rq = HWGROUP(drive)->rq;
 393         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
 394         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 395         struct Scsi_Host *host;
 396         u8 *scsi_buf;
 397         int errors = rq->errors;
 398         unsigned long flags;
 399
 400         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
 401                 ide_end_request(drive, uptodate, nrsecs);
 402                 return 0;
 403         }
 404         ide_end_drive_cmd (drive, 0, 0);
 405         if (blk_sense_request(rq)) {
 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 (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 (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_to_idescsi(drive);
 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_in_hardirq();
 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         BUG_ON(HWGROUP(drive)->handler != NULL);
 602         /* Set the interrupt routine */
 603         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 604         /* Send the actual packet */
 605         drive->hwif->atapi_output_bytes(drive, scsi->pc->c, 12);
 606         if (test_bit (PC_DMA_OK, &pc->flags)) {
 607                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
 608                 hwif->dma_start(drive);
 609         }
 610         return ide_started;
 611 }
 612
 613 static inline int idescsi_set_direction(idescsi_pc_t *pc)
 614 {
 615         switch (pc->c[0]) {
 616                 case READ_6: case READ_10: case READ_12:
 617                         clear_bit(PC_WRITING, &pc->flags);
 618                         return 0;
 619                 case WRITE_6: case WRITE_10: case WRITE_12:
 620                         set_bit(PC_WRITING, &pc->flags);
 621                         return 0;
 622                 default:
 623                         return 1;
 624         }
 625 }
 626
 627 static int idescsi_map_sg(ide_drive_t *drive, idescsi_pc_t *pc)
 628 {
 629         ide_hwif_t *hwif = drive->hwif;
 630         struct scatterlist *sg, *scsi_sg;
 631         int segments;
 632
 633         if (!pc->request_transfer || pc->request_transfer % 1024)
 634                 return 1;
 635
 636         if (idescsi_set_direction(pc))
 637                 return 1;
 638
 639         sg = hwif->sg_table;
 640         scsi_sg = pc->scsi_cmd->request_buffer;
 641         segments = pc->scsi_cmd->use_sg;
 642
 643         if (segments > hwif->sg_max_nents)
 644                 return 1;
 645
 646         if (!segments) {
 647                 hwif->sg_nents = 1;
 648                 sg_init_one(sg, pc->scsi_cmd->request_buffer, pc->request_transfer);
 649         } else {
 650                 hwif->sg_nents = segments;
 651                 memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 652         }
 653
 654         return 0;
 655 }
 656
 657 /*
 658  *      Issue a packet command
 659  */
 660 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
 661 {
 662         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 663         ide_hwif_t *hwif = drive->hwif;
 664         atapi_feature_t feature;
 665         atapi_bcount_t bcount;
 666
 667         scsi->pc=pc;                                                    /* Set the current packet command */
 668         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
 669         pc->current_position=pc->buffer;
 670         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
 671
 672         feature.all = 0;
 673         if (drive->using_dma && !idescsi_map_sg(drive, pc)) {
 674                 hwif->sg_mapped = 1;
 675                 feature.b.dma = !hwif->dma_setup(drive);
 676                 hwif->sg_mapped = 0;
 677         }
 678
 679         SELECT_DRIVE(drive);
 680         if (IDE_CONTROL_REG)
 681                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
 682
 683         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
 684         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
 685         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
 686
 687         if (feature.b.dma)
 688                 set_bit(PC_DMA_OK, &pc->flags);
 689
 690         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
 691                 BUG_ON(HWGROUP(drive)->handler != NULL);
 692                 ide_set_handler(drive, &idescsi_transfer_pc,
 693                                 get_timeout(pc), idescsi_expiry);
 694                 /* Issue the packet command */
 695                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 696                 return ide_started;
 697         } else {
 698                 /* Issue the packet command */
 699                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 700                 return idescsi_transfer_pc(drive);
 701         }
 702 }
 703
 704 /*
 705  *      idescsi_do_request is our request handling function.
 706  */
 707 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 708 {
 709 #if IDESCSI_DEBUG_LOG
 710         printk (KERN_INFO "dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,rq->cmd[0],rq->errors);
 711         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
 712 #endif /* IDESCSI_DEBUG_LOG */
 713
 714         if (blk_sense_request(rq) || blk_special_request(rq)) {
 715                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
 716         }
 717         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 718         idescsi_end_request (drive, 0, 0);
 719         return ide_stopped;
 720 }
 721
 722 #ifdef CONFIG_IDE_PROC_FS
 723 static void idescsi_add_settings(ide_drive_t *drive)
 724 {
 725         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 726
 727 /*
 728  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
 729  */
 730         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 731         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 732         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 733         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 734         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 735 }
 736 #else
 737 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
 738 #endif
 739
 740 /*
 741  *      Driver initialization.
 742  */
 743 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 744 {
 745         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 746                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 747         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
 748         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 749 #if IDESCSI_DEBUG_LOG
 750         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 751 #endif /* IDESCSI_DEBUG_LOG */
 752         idescsi_add_settings(drive);
 753 }
 754
 755 static void ide_scsi_remove(ide_drive_t *drive)
 756 {
 757         struct Scsi_Host *scsihost = drive->driver_data;
 758         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 759         struct gendisk *g = scsi->disk;
 760
 761         ide_proc_unregister_driver(drive, scsi->driver);
 762
 763         ide_unregister_region(g);
 764
 765         drive->driver_data = NULL;
 766         g->private_data = NULL;
 767         put_disk(g);
 768
 769         scsi_remove_host(scsihost);
 770         ide_scsi_put(scsi);
 771 }
 772
 773 static int ide_scsi_probe(ide_drive_t *);
 774
 775 #ifdef CONFIG_IDE_PROC_FS
 776 static ide_proc_entry_t idescsi_proc[] = {
 777         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 778         { NULL, 0, NULL, NULL }
 779 };
 780 #endif
 781
 782 static ide_driver_t idescsi_driver = {
 783         .gen_driver = {
 784                 .owner          = THIS_MODULE,
 785                 .name           = "ide-scsi",
 786                 .bus            = &ide_bus_type,
 787         },
 788         .probe                  = ide_scsi_probe,
 789         .remove                 = ide_scsi_remove,
 790         .version                = IDESCSI_VERSION,
 791         .media                  = ide_scsi,
 792         .supports_dsc_overlap   = 0,
 793         .do_request             = idescsi_do_request,
 794         .end_request            = idescsi_end_request,
 795         .error                  = idescsi_atapi_error,
 796         .abort                  = idescsi_atapi_abort,
 797 #ifdef CONFIG_IDE_PROC_FS
 798         .proc                   = idescsi_proc,
 799 #endif
 800 };
 801
 802 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 803 {
 804         struct gendisk *disk = inode->i_bdev->bd_disk;
 805         struct ide_scsi_obj *scsi;
 806
 807         if (!(scsi = ide_scsi_get(disk)))
 808                 return -ENXIO;
 809
 810         return 0;
 811 }
 812
 813 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 814 {
 815         struct gendisk *disk = inode->i_bdev->bd_disk;
 816         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 817
 818         ide_scsi_put(scsi);
 819
 820         return 0;
 821 }
 822
 823 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 824                         unsigned int cmd, unsigned long arg)
 825 {
 826         struct block_device *bdev = inode->i_bdev;
 827         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 828         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 829 }
 830
 831 static struct block_device_operations idescsi_ops = {
 832         .owner          = THIS_MODULE,
 833         .open           = idescsi_ide_open,
 834         .release        = idescsi_ide_release,
 835         .ioctl          = idescsi_ide_ioctl,
 836 };
 837
 838 static int idescsi_slave_configure(struct scsi_device * sdp)
 839 {
 840         /* Configure detected device */
 841         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 842         return 0;
 843 }
 844
 845 static const char *idescsi_info (struct Scsi_Host *host)
 846 {
 847         return "SCSI host adapter emulation for IDE ATAPI devices";
 848 }
 849
 850 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 851 {
 852         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 853
 854         if (cmd == SG_SET_TRANSFORM) {
 855                 if (arg)
 856                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 857                 else
 858                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 859                 return 0;
 860         } else if (cmd == SG_GET_TRANSFORM)
 861                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 862         return -EINVAL;
 863 }
 864
 865 static inline int should_transform(ide_drive_t *drive, struct scsi_cmnd *cmd)
 866 {
 867         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 868
 869         /* this was a layering violation and we can't support it
 870            anymore, sorry. */
 871 #if 0
 872         struct gendisk *disk = cmd->request->rq_disk;
 873
 874         if (disk) {
 875                 struct struct scsi_device_Template **p = disk->private_data;
 876                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
 877                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 878         }
 879 #endif
 880         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
 881 }
 882
 883 static int idescsi_queue (struct scsi_cmnd *cmd,
 884                 void (*done)(struct scsi_cmnd *))
 885 {
 886         struct Scsi_Host *host = cmd->device->host;
 887         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 888         ide_drive_t *drive = scsi->drive;
 889         struct request *rq = NULL;
 890         idescsi_pc_t *pc = NULL;
 891
 892         if (!drive) {
 893                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 894                 goto abort;
 895         }
 896         scsi = drive_to_idescsi(drive);
 897         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 898         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 899         if (rq == NULL || pc == NULL) {
 900                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 901                 goto abort;
 902         }
 903
 904         memset (pc->c, 0, 12);
 905         pc->flags = 0;
 906         pc->rq = rq;
 907         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 908         if (cmd->use_sg) {
 909                 pc->buffer = NULL;
 910                 pc->sg = cmd->request_buffer;
 911         } else {
 912                 pc->buffer = cmd->request_buffer;
 913                 pc->sg = NULL;
 914         }
 915         pc->b_count = 0;
 916         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
 917         pc->scsi_cmd = cmd;
 918         pc->done = done;
 919         pc->timeout = jiffies + cmd->timeout_per_command;
 920
 921         if (should_transform(drive, cmd))
 922                 set_bit(PC_TRANSFORM, &pc->flags);
 923         idescsi_transform_pc1 (drive, pc);
 924
 925         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 926                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 927                 hexdump(cmd->cmnd, cmd->cmd_len);
 928                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 929                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 930                         hexdump(pc->c, 12);
 931                 }
 932         }
 933
 934         ide_init_drive_cmd (rq);
 935         rq->special = (char *) pc;
 936         rq->cmd_type = REQ_TYPE_SPECIAL;
 937         spin_unlock_irq(host->host_lock);
 938         rq->rq_disk = scsi->disk;
 939         (void) ide_do_drive_cmd (drive, rq, ide_end);
 940         spin_lock_irq(host->host_lock);
 941         return 0;
 942 abort:
 943         kfree (pc);
 944         kfree (rq);
 945         cmd->result = DID_ERROR << 16;
 946         done(cmd);
 947         return 0;
 948 }
 949
 950 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 951 {
 952         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 953         ide_drive_t    *drive = scsi->drive;
 954         int             busy;
 955         int             ret   = FAILED;
 956
 957         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 958
 959         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 960                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 961
 962         if (!drive) {
 963                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 964                 WARN_ON(1);
 965                 goto no_drive;
 966         }
 967
 968         /* First give it some more time, how much is "right" is hard to say :-( */
 969
 970         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 971         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 972                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 973
 974         spin_lock_irq(&ide_lock);
 975
 976         /* If there is no pc running we're done (our interrupt took care of it) */
 977         if (!scsi->pc) {
 978                 ret = SUCCESS;
 979                 goto ide_unlock;
 980         }
 981
 982         /* It's somewhere in flight. Does ide subsystem agree? */
 983         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 984             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 985                 /*
 986                  * FIXME - not sure this condition can ever occur
 987                  */
 988                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 989
 990                 if (blk_sense_request(scsi->pc->rq))
 991                         kfree(scsi->pc->buffer);
 992                 kfree(scsi->pc->rq);
 993                 kfree(scsi->pc);
 994                 scsi->pc = NULL;
 995
 996                 ret = SUCCESS;
 997         }
 998
 999 ide_unlock:
1000         spin_unlock_irq(&ide_lock);
1001 no_drive:
1002         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1003                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
1004
1005         return ret;
1006 }
1007
1008 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
1009 {
1010         struct request *req;
1011         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
1012         ide_drive_t    *drive = scsi->drive;
1013         int             ready = 0;
1014         int             ret   = SUCCESS;
1015
1016         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1017
1018         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1019                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1020
1021         if (!drive) {
1022                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1023                 WARN_ON(1);
1024                 return FAILED;
1025         }
1026
1027         spin_lock_irq(cmd->device->host->host_lock);
1028         spin_lock(&ide_lock);
1029
1030         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1031                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1032                 spin_unlock(&ide_lock);
1033                 spin_unlock_irq(cmd->device->host->host_lock);
1034                 return FAILED;
1035         }
1036
1037         /* kill current request */
1038         blkdev_dequeue_request(req);
1039         end_that_request_last(req, 0);
1040         if (blk_sense_request(req))
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, 0);
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(&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                 spin_unlock_irq(cmd->device->host->host_lock);
1063                 msleep(50);
1064                 spin_lock_irq(cmd->device->host->host_lock);
1065         } while ( HWGROUP(drive)->handler );
1066
1067         ready = drive_is_ready(drive);
1068         HWGROUP(drive)->busy--;
1069         if (!ready) {
1070                 printk (KERN_ERR "ide-scsi: reset failed!\n");
1071                 ret = FAILED;
1072         }
1073
1074         spin_unlock_irq(cmd->device->host->host_lock);
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(ide_drive_t *drive)
1113 {
1114         idescsi_scsi_t *idescsi;
1115         struct Scsi_Host *host;
1116         struct gendisk *g;
1117         static int warned;
1118         int err = -ENOMEM;
1119
1120         if (!warned && drive->media == ide_cdrom) {
1121                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1122                 warned = 1;
1123         }
1124
1125         if (idescsi_nocd && drive->media == ide_cdrom)
1126                 return -ENODEV;
1127
1128         if (!strstr("ide-scsi", drive->driver_req) ||
1129             !drive->present ||
1130             drive->media == ide_disk ||
1131             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1132                 return -ENODEV;
1133
1134         g = alloc_disk(1 << PARTN_BITS);
1135         if (!g)
1136                 goto out_host_put;
1137
1138         ide_init_disk(g, drive);
1139
1140         host->max_id = 1;
1141
1142 #if IDESCSI_DEBUG_LOG
1143         if (drive->id->last_lun)
1144                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1145 #endif
1146         if ((drive->id->last_lun & 0x7) != 7)
1147                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1148         else
1149                 host->max_lun = 1;
1150
1151         drive->driver_data = host;
1152         idescsi = scsihost_to_idescsi(host);
1153         idescsi->drive = drive;
1154         idescsi->driver = &idescsi_driver;
1155         idescsi->host = host;
1156         idescsi->disk = g;
1157         g->private_data = &idescsi->driver;
1158         ide_proc_register_driver(drive, &idescsi_driver);
1159         err = 0;
1160         idescsi_setup(drive, idescsi);
1161         g->fops = &idescsi_ops;
1162         ide_register_region(g);
1163         err = scsi_add_host(host, &drive->gendev);
1164         if (!err) {
1165                 scsi_scan_host(host);
1166                 return 0;
1167         }
1168         /* fall through on error */
1169         ide_unregister_region(g);
1170         ide_proc_unregister_driver(drive, &idescsi_driver);
1171
1172         put_disk(g);
1173 out_host_put:
1174         scsi_host_put(host);
1175         return err;
1176 }
1177
1178 static int __init init_idescsi_module(void)
1179 {
1180         return driver_register(&idescsi_driver.gen_driver);
1181 }
1182
1183 static void __exit exit_idescsi_module(void)
1184 {
1185         driver_unregister(&idescsi_driver.gen_driver);
1186 }
1187
1188 module_param(idescsi_nocd, int, 0600);
1189 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
1190 module_init(init_idescsi_module);
1191 module_exit(exit_idescsi_module);
1192 MODULE_LICENSE("GPL");