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