drivers/scsi/ide-scsi.c

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