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         /* retry only "normal" I/O: */
 322         if (rq->flags & (REQ_DRIVE_CMD | REQ_DRIVE_TASK | REQ_DRIVE_TASKFILE)) {
 323                 rq->errors = 1;
 324                 ide_end_drive_cmd(drive, stat, err);
 325                 return ide_stopped;
 326         }
 327
 328         if (HWIF(drive)->INB(IDE_STATUS_REG) & (BUSY_STAT|DRQ_STAT))
 329                 /* force an abort */
 330                 HWIF(drive)->OUTB(WIN_IDLEIMMEDIATE,IDE_COMMAND_REG);
 331
 332         rq->errors++;
 333         DRIVER(drive)->end_request(drive, 0, 0);
 334         return ide_stopped;
 335 }
 336
 337 ide_startstop_t idescsi_atapi_abort (ide_drive_t *drive, const char *msg)
 338 {
 339         struct request *rq;
 340
 341         if (drive == NULL || (rq = HWGROUP(drive)->rq) == NULL)
 342                return ide_stopped;
 343
 344         /* retry only "normal" I/O: */
 345         if (rq->flags & (REQ_DRIVE_CMD | REQ_DRIVE_TASK | REQ_DRIVE_TASKFILE)) {
 346                 rq->errors = 1;
 347                 ide_end_drive_cmd(drive, BUSY_STAT, 0);
 348                 return ide_stopped;
 349         }
 350
 351 #if IDESCSI_DEBUG_LOG
 352         printk(KERN_WARNING "idescsi_atapi_abort called for %lu\n",
 353                         ((idescsi_pc_t *) rq->special)->scsi_cmd->serial_number);
 354 #endif
 355         rq->errors |= ERROR_MAX;
 356         DRIVER(drive)->end_request(drive, 0, 0);
 357         return ide_stopped;
 358 }
 359
 360 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 361 {
 362         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 363         struct request *rq = HWGROUP(drive)->rq;
 364         idescsi_pc_t *pc = (idescsi_pc_t *) rq->special;
 365         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 366         struct Scsi_Host *host;
 367         u8 *scsi_buf;
 368         unsigned long flags;
 369
 370         if (!(rq->flags & (REQ_SPECIAL|REQ_SENSE))) {
 371                 ide_end_request(drive, uptodate, nrsecs);
 372                 return 0;
 373         }
 374         ide_end_drive_cmd (drive, 0, 0);
 375         if (rq->flags & REQ_SENSE) {
 376                 idescsi_pc_t *opc = (idescsi_pc_t *) rq->buffer;
 377                 if (log) {
 378                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 379                         hexdump(pc->buffer,16);
 380                 }
 381                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buffer, SCSI_SENSE_BUFFERSIZE);
 382                 kfree(pc->buffer);
 383                 kfree(pc);
 384                 kfree(rq);
 385                 pc = opc;
 386                 rq = pc->rq;
 387                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 388                                         ((test_bit(PC_TIMEDOUT, &pc->flags)?DID_TIME_OUT:DID_OK) << 16);
 389         } else if (test_bit(PC_TIMEDOUT, &pc->flags)) {
 390                 if (log)
 391                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 392                                         drive->name, pc->scsi_cmd->serial_number);
 393                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 394         } else if (rq->errors >= ERROR_MAX) {
 395                 pc->scsi_cmd->result = DID_ERROR << 16;
 396                 if (log)
 397                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 398         } else if (rq->errors) {
 399                 if (log)
 400                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 401                 if (!idescsi_check_condition(drive, rq))
 402                         /* we started a request sense, so we'll be back, exit for now */
 403                         return 0;
 404                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 405         } else {
 406                 pc->scsi_cmd->result = DID_OK << 16;
 407                 idescsi_transform_pc2 (drive, pc);
 408                 if (log) {
 409                         printk ("ide-scsi: %s: suc %lu", drive->name, pc->scsi_cmd->serial_number);
 410                         if (!test_bit(PC_WRITING, &pc->flags) && pc->actually_transferred && pc->actually_transferred <= 1024 && pc->buffer) {
 411                                 printk(", rst = ");
 412                                 scsi_buf = pc->scsi_cmd->request_buffer;
 413                                 hexdump(scsi_buf, min_t(unsigned, 16, pc->scsi_cmd->request_bufflen));
 414                         } else printk("\n");
 415                 }
 416         }
 417         host = pc->scsi_cmd->device->host;
 418         spin_lock_irqsave(host->host_lock, flags);
 419         pc->done(pc->scsi_cmd);
 420         spin_unlock_irqrestore(host->host_lock, flags);
 421         idescsi_free_bio(rq->bio);
 422         kfree(pc);
 423         kfree(rq);
 424         scsi->pc = NULL;
 425         return 0;
 426 }
 427
 428 static inline unsigned long get_timeout(idescsi_pc_t *pc)
 429 {
 430         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 431 }
 432
 433 static int idescsi_expiry(ide_drive_t *drive)
 434 {
 435         idescsi_scsi_t *scsi = drive->driver_data;
 436         idescsi_pc_t   *pc   = scsi->pc;
 437
 438 #if IDESCSI_DEBUG_LOG
 439         printk(KERN_WARNING "idescsi_expiry called for %lu at %lu\n", pc->scsi_cmd->serial_number, jiffies);
 440 #endif
 441         set_bit(PC_TIMEDOUT, &pc->flags);
 442
 443         return 0;                                       /* we do not want the ide subsystem to retry */
 444 }
 445
 446 /*
 447  *      Our interrupt handler.
 448  */
 449 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 450 {
 451         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 452         idescsi_pc_t *pc=scsi->pc;
 453         struct request *rq = pc->rq;
 454         atapi_bcount_t bcount;
 455         atapi_status_t status;
 456         atapi_ireason_t ireason;
 457         atapi_feature_t feature;
 458
 459         unsigned int temp;
 460
 461 #if IDESCSI_DEBUG_LOG
 462         printk (KERN_INFO "ide-scsi: Reached idescsi_pc_intr interrupt handler\n");
 463 #endif /* IDESCSI_DEBUG_LOG */
 464
 465         if (test_bit(PC_TIMEDOUT, &pc->flags)){
 466 #if IDESCSI_DEBUG_LOG
 467                 printk(KERN_WARNING "idescsi_pc_intr: got timed out packet  %lu at %lu\n",
 468                                 pc->scsi_cmd->serial_number, jiffies);
 469 #endif
 470                 /* end this request now - scsi should retry it*/
 471                 idescsi_end_request (drive, 1, 0);
 472                 return ide_stopped;
 473         }
 474         if (test_and_clear_bit (PC_DMA_IN_PROGRESS, &pc->flags)) {
 475 #if IDESCSI_DEBUG_LOG
 476                 printk ("ide-scsi: %s: DMA complete\n", drive->name);
 477 #endif /* IDESCSI_DEBUG_LOG */
 478                 pc->actually_transferred=pc->request_transfer;
 479                 (void) HWIF(drive)->ide_dma_end(drive);
 480         }
 481
 482         feature.all = 0;
 483         /* Clear the interrupt */
 484         status.all = HWIF(drive)->INB(IDE_STATUS_REG);
 485
 486         if (!status.b.drq) {
 487                 /* No more interrupts */
 488                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 489                         printk (KERN_INFO "Packet command completed, %d bytes transferred\n", pc->actually_transferred);
 490                 local_irq_enable();
 491                 if (status.b.check)
 492                         rq->errors++;
 493                 idescsi_end_request (drive, 1, 0);
 494                 return ide_stopped;
 495         }
 496         bcount.b.low    = HWIF(drive)->INB(IDE_BCOUNTL_REG);
 497         bcount.b.high   = HWIF(drive)->INB(IDE_BCOUNTH_REG);
 498         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 499
 500         if (ireason.b.cod) {
 501                 printk(KERN_ERR "ide-scsi: CoD != 0 in idescsi_pc_intr\n");
 502                 return ide_do_reset (drive);
 503         }
 504         if (ireason.b.io) {
 505                 temp = pc->actually_transferred + bcount.all;
 506                 if (temp > pc->request_transfer) {
 507                         if (temp > pc->buffer_size) {
 508                                 printk(KERN_ERR "ide-scsi: The scsi wants to "
 509                                         "send us more data than expected "
 510                                         "- discarding data\n");
 511                                 temp = pc->buffer_size - pc->actually_transferred;
 512                                 if (temp) {
 513                                         clear_bit(PC_WRITING, &pc->flags);
 514                                         if (pc->sg)
 515                                                 idescsi_input_buffers(drive, pc, temp);
 516                                         else
 517                                                 atapi_input_bytes(drive, pc->current_position, temp);
 518                                         printk(KERN_ERR "ide-scsi: transferred %d of %d bytes\n", temp, bcount.all);
 519                                 }
 520                                 pc->actually_transferred += temp;
 521                                 pc->current_position += temp;
 522                                 idescsi_discard_data(drive, bcount.all - temp);
 523                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 524                                 return ide_started;
 525                         }
 526 #if IDESCSI_DEBUG_LOG
 527                         printk (KERN_NOTICE "ide-scsi: The scsi wants to send us more data than expected - allowing transfer\n");
 528 #endif /* IDESCSI_DEBUG_LOG */
 529                 }
 530         }
 531         if (ireason.b.io) {
 532                 clear_bit(PC_WRITING, &pc->flags);
 533                 if (pc->sg)
 534                         idescsi_input_buffers(drive, pc, bcount.all);
 535                 else
 536                         HWIF(drive)->atapi_input_bytes(drive, pc->current_position, bcount.all);
 537         } else {
 538                 set_bit(PC_WRITING, &pc->flags);
 539                 if (pc->sg)
 540                         idescsi_output_buffers (drive, pc, bcount.all);
 541                 else
 542                         HWIF(drive)->atapi_output_bytes(drive, pc->current_position, bcount.all);
 543         }
 544         /* Update the current position */
 545         pc->actually_transferred += bcount.all;
 546         pc->current_position += bcount.all;
 547
 548         /* And set the interrupt handler again */
 549         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 550         return ide_started;
 551 }
 552
 553 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 554 {
 555         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 556         idescsi_pc_t *pc = scsi->pc;
 557         atapi_ireason_t ireason;
 558         ide_startstop_t startstop;
 559
 560         if (ide_wait_stat(&startstop,drive,DRQ_STAT,BUSY_STAT,WAIT_READY)) {
 561                 printk(KERN_ERR "ide-scsi: Strange, packet command "
 562                         "initiated yet DRQ isn't asserted\n");
 563                 return startstop;
 564         }
 565         ireason.all     = HWIF(drive)->INB(IDE_IREASON_REG);
 566         if (!ireason.b.cod || ireason.b.io) {
 567                 printk(KERN_ERR "ide-scsi: (IO,CoD) != (0,1) while "
 568                                 "issuing a packet command\n");
 569                 return ide_do_reset (drive);
 570         }
 571         if (HWGROUP(drive)->handler != NULL)
 572                 BUG();
 573         /* Set the interrupt routine */
 574         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 575         /* Send the actual packet */
 576         atapi_output_bytes(drive, scsi->pc->c, 12);
 577         if (test_bit (PC_DMA_OK, &pc->flags)) {
 578                 set_bit (PC_DMA_IN_PROGRESS, &pc->flags);
 579                 (void) (HWIF(drive)->ide_dma_begin(drive));
 580         }
 581         return ide_started;
 582 }
 583
 584 /*
 585  *      Issue a packet command
 586  */
 587 static ide_startstop_t idescsi_issue_pc (ide_drive_t *drive, idescsi_pc_t *pc)
 588 {
 589         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 590         atapi_feature_t feature;
 591         atapi_bcount_t bcount;
 592         struct request *rq = pc->rq;
 593
 594         scsi->pc=pc;                                                    /* Set the current packet command */
 595         pc->actually_transferred=0;                                     /* We haven't transferred any data yet */
 596         pc->current_position=pc->buffer;
 597         bcount.all = min(pc->request_transfer, 63 * 1024);              /* Request to transfer the entire buffer at once */
 598
 599         feature.all = 0;
 600         if (drive->using_dma && rq->bio) {
 601                 if (test_bit(PC_WRITING, &pc->flags))
 602                         feature.b.dma = !HWIF(drive)->ide_dma_write(drive);
 603                 else
 604                         feature.b.dma = !HWIF(drive)->ide_dma_read(drive);
 605         }
 606
 607         SELECT_DRIVE(drive);
 608         if (IDE_CONTROL_REG)
 609                 HWIF(drive)->OUTB(drive->ctl, IDE_CONTROL_REG);
 610
 611         HWIF(drive)->OUTB(feature.all, IDE_FEATURE_REG);
 612         HWIF(drive)->OUTB(bcount.b.high, IDE_BCOUNTH_REG);
 613         HWIF(drive)->OUTB(bcount.b.low, IDE_BCOUNTL_REG);
 614
 615         if (feature.b.dma)
 616                 set_bit(PC_DMA_OK, &pc->flags);
 617
 618         if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags)) {
 619                 if (HWGROUP(drive)->handler != NULL)
 620                         BUG();
 621                 ide_set_handler(drive, &idescsi_transfer_pc,
 622                                 get_timeout(pc), idescsi_expiry);
 623                 /* Issue the packet command */
 624                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 625                 return ide_started;
 626         } else {
 627                 /* Issue the packet command */
 628                 HWIF(drive)->OUTB(WIN_PACKETCMD, IDE_COMMAND_REG);
 629                 return idescsi_transfer_pc(drive);
 630         }
 631 }
 632
 633 /*
 634  *      idescsi_do_request is our request handling function.
 635  */
 636 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 637 {
 638 #if IDESCSI_DEBUG_LOG
 639         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);
 640         printk (KERN_INFO "sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",rq->sector,rq->nr_sectors,rq->current_nr_sectors);
 641 #endif /* IDESCSI_DEBUG_LOG */
 642
 643         if (rq->flags & (REQ_SPECIAL|REQ_SENSE)) {
 644                 return idescsi_issue_pc (drive, (idescsi_pc_t *) rq->special);
 645         }
 646         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 647         idescsi_end_request (drive, 0, 0);
 648         return ide_stopped;
 649 }
 650
 651 static void idescsi_add_settings(ide_drive_t *drive)
 652 {
 653         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 654
 655 /*
 656  *                      drive   setting name    read/write      ioctl   ioctl           data type       min     max     mul_factor      div_factor      data pointer            set function
 657  */
 658         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 659         ide_add_setting(drive,  "bios_head",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 660         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     -1,     -1,             TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 661         ide_add_setting(drive,  "transform",    SETTING_RW,     -1,     -1,             TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 662         ide_add_setting(drive,  "log",          SETTING_RW,     -1,     -1,             TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 663 }
 664
 665 /*
 666  *      Driver initialization.
 667  */
 668 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 669 {
 670         DRIVER(drive)->busy++;
 671         drive->ready_stat = 0;
 672         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 673                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 674         set_bit(IDESCSI_TRANSFORM, &scsi->transform);
 675         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 676 #if IDESCSI_DEBUG_LOG
 677         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 678 #endif /* IDESCSI_DEBUG_LOG */
 679         idescsi_add_settings(drive);
 680         DRIVER(drive)->busy--;
 681 }
 682
 683 static int idescsi_cleanup (ide_drive_t *drive)
 684 {
 685         struct Scsi_Host *scsihost = drive->driver_data;
 686
 687         if (ide_unregister_subdriver(drive))
 688                 return 1;
 689
 690         /* FIXME?: Are these two statements necessary? */
 691         drive->driver_data = NULL;
 692         drive->disk->fops = ide_fops;
 693
 694         scsi_remove_host(scsihost);
 695         scsi_host_put(scsihost);
 696         return 0;
 697 }
 698
 699 static int idescsi_attach(ide_drive_t *drive);
 700
 701 /*
 702  *      IDE subdriver functions, registered with ide.c
 703  */
 704 static ide_driver_t idescsi_driver = {
 705         .owner                  = THIS_MODULE,
 706         .name                   = "ide-scsi",
 707         .version                = IDESCSI_VERSION,
 708         .media                  = ide_scsi,
 709         .busy                   = 0,
 710         .supports_dsc_overlap   = 0,
 711         .attach                 = idescsi_attach,
 712         .cleanup                = idescsi_cleanup,
 713         .do_request             = idescsi_do_request,
 714         .end_request            = idescsi_end_request,
 715         .error                  = idescsi_atapi_error,
 716         .abort                  = idescsi_atapi_abort,
 717         .drives                 = LIST_HEAD_INIT(idescsi_driver.drives),
 718 };
 719
 720 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 721 {
 722         ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
 723         drive->usage++;
 724         return 0;
 725 }
 726
 727 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 728 {
 729         ide_drive_t *drive = inode->i_bdev->bd_disk->private_data;
 730         drive->usage--;
 731         return 0;
 732 }
 733
 734 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 735                         unsigned int cmd, unsigned long arg)
 736 {
 737         struct block_device *bdev = inode->i_bdev;
 738         return generic_ide_ioctl(bdev, cmd, arg);
 739 }
 740
 741 static struct block_device_operations idescsi_ops = {
 742         .owner          = THIS_MODULE,
 743         .open           = idescsi_ide_open,
 744         .release        = idescsi_ide_release,
 745         .ioctl          = idescsi_ide_ioctl,
 746 };
 747
 748 static int idescsi_attach(ide_drive_t *drive);
 749
 750 static int idescsi_slave_configure(Scsi_Device * sdp)
 751 {
 752         /* Configure detected device */
 753         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 754         return 0;
 755 }
 756
 757 static const char *idescsi_info (struct Scsi_Host *host)
 758 {
 759         return "SCSI host adapter emulation for IDE ATAPI devices";
 760 }
 761
 762 static int idescsi_ioctl (Scsi_Device *dev, int cmd, void __user *arg)
 763 {
 764         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 765
 766         if (cmd == SG_SET_TRANSFORM) {
 767                 if (arg)
 768                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 769                 else
 770                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 771                 return 0;
 772         } else if (cmd == SG_GET_TRANSFORM)
 773                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 774         return -EINVAL;
 775 }
 776
 777 static inline struct bio *idescsi_kmalloc_bio (int count)
 778 {
 779         struct bio *bh, *bhp, *first_bh;
 780
 781         if ((first_bh = bhp = bh = bio_alloc(GFP_ATOMIC, 1)) == NULL)
 782                 goto abort;
 783         bio_init(bh);
 784         bh->bi_vcnt = 1;
 785         while (--count) {
 786                 if ((bh = bio_alloc(GFP_ATOMIC, 1)) == NULL)
 787                         goto abort;
 788                 bio_init(bh);
 789                 bh->bi_vcnt = 1;
 790                 bhp->bi_next = bh;
 791                 bhp = bh;
 792                 bh->bi_next = NULL;
 793         }
 794         return first_bh;
 795 abort:
 796         idescsi_free_bio (first_bh);
 797         return NULL;
 798 }
 799
 800 static inline int idescsi_set_direction (idescsi_pc_t *pc)
 801 {
 802         switch (pc->c[0]) {
 803                 case READ_6: case READ_10: case READ_12:
 804                         clear_bit (PC_WRITING, &pc->flags);
 805                         return 0;
 806                 case WRITE_6: case WRITE_10: case WRITE_12:
 807                         set_bit (PC_WRITING, &pc->flags);
 808                         return 0;
 809                 default:
 810                         return 1;
 811         }
 812 }
 813
 814 static inline struct bio *idescsi_dma_bio(ide_drive_t *drive, idescsi_pc_t *pc)
 815 {
 816         struct bio *bh = NULL, *first_bh = NULL;
 817         int segments = pc->scsi_cmd->use_sg;
 818         struct scatterlist *sg = pc->scsi_cmd->request_buffer;
 819
 820         if (!drive->using_dma || !pc->request_transfer || pc->request_transfer % 1024)
 821                 return NULL;
 822         if (idescsi_set_direction(pc))
 823                 return NULL;
 824         if (segments) {
 825                 if ((first_bh = bh = idescsi_kmalloc_bio (segments)) == NULL)
 826                         return NULL;
 827 #if IDESCSI_DEBUG_LOG
 828                 printk ("ide-scsi: %s: building DMA table, %d segments, %dkB total\n", drive->name, segments, pc->request_transfer >> 10);
 829 #endif /* IDESCSI_DEBUG_LOG */
 830                 while (segments--) {
 831                         bh->bi_io_vec[0].bv_page = sg->page;
 832                         bh->bi_io_vec[0].bv_len = sg->length;
 833                         bh->bi_io_vec[0].bv_offset = sg->offset;
 834                         bh->bi_size = sg->length;
 835                         bh = bh->bi_next;
 836                         sg++;
 837                 }
 838         } else {
 839                 if ((first_bh = bh = idescsi_kmalloc_bio (1)) == NULL)
 840                         return NULL;
 841 #if IDESCSI_DEBUG_LOG
 842                 printk ("ide-scsi: %s: building DMA table for a single buffer (%dkB)\n", drive->name, pc->request_transfer >> 10);
 843 #endif /* IDESCSI_DEBUG_LOG */
 844                 bh->bi_io_vec[0].bv_page = virt_to_page(pc->scsi_cmd->request_buffer);
 845                 bh->bi_io_vec[0].bv_offset = offset_in_page(pc->scsi_cmd->request_buffer);
 846                 bh->bi_io_vec[0].bv_len = pc->request_transfer;
 847                 bh->bi_size = pc->request_transfer;
 848         }
 849         return first_bh;
 850 }
 851
 852 static inline int should_transform(ide_drive_t *drive, Scsi_Cmnd *cmd)
 853 {
 854         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 855
 856         /* this was a layering violation and we can't support it
 857            anymore, sorry. */
 858 #if 0
 859         struct gendisk *disk = cmd->request->rq_disk;
 860
 861         if (disk) {
 862                 struct Scsi_Device_Template **p = disk->private_data;
 863                 if (strcmp((*p)->scsi_driverfs_driver.name, "sg") == 0)
 864                         return test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 865         }
 866 #endif
 867         return test_bit(IDESCSI_TRANSFORM, &scsi->transform);
 868 }
 869
 870 static int idescsi_queue (Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
 871 {
 872         struct Scsi_Host *host = cmd->device->host;
 873         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 874         ide_drive_t *drive = scsi->drive;
 875         struct request *rq = NULL;
 876         idescsi_pc_t *pc = NULL;
 877
 878         if (!drive) {
 879                 printk (KERN_ERR "ide-scsi: drive id %d not present\n", cmd->device->id);
 880                 goto abort;
 881         }
 882         scsi = drive_to_idescsi(drive);
 883         pc = kmalloc (sizeof (idescsi_pc_t), GFP_ATOMIC);
 884         rq = kmalloc (sizeof (struct request), GFP_ATOMIC);
 885         if (rq == NULL || pc == NULL) {
 886                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 887                 goto abort;
 888         }
 889
 890         memset (pc->c, 0, 12);
 891         pc->flags = 0;
 892         pc->rq = rq;
 893         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 894         if (cmd->use_sg) {
 895                 pc->buffer = NULL;
 896                 pc->sg = cmd->request_buffer;
 897         } else {
 898                 pc->buffer = cmd->request_buffer;
 899                 pc->sg = NULL;
 900         }
 901         pc->b_count = 0;
 902         pc->request_transfer = pc->buffer_size = cmd->request_bufflen;
 903         pc->scsi_cmd = cmd;
 904         pc->done = done;
 905         pc->timeout = jiffies + cmd->timeout_per_command;
 906
 907         if (should_transform(drive, cmd))
 908                 set_bit(PC_TRANSFORM, &pc->flags);
 909         idescsi_transform_pc1 (drive, pc);
 910
 911         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 912                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 913                 hexdump(cmd->cmnd, cmd->cmd_len);
 914                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 915                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 916                         hexdump(pc->c, 12);
 917                 }
 918         }
 919
 920         ide_init_drive_cmd (rq);
 921         rq->special = (char *) pc;
 922         rq->bio = idescsi_dma_bio (drive, pc);
 923         rq->flags = REQ_SPECIAL;
 924         spin_unlock_irq(host->host_lock);
 925         (void) ide_do_drive_cmd (drive, rq, ide_end);
 926         spin_lock_irq(host->host_lock);
 927         return 0;
 928 abort:
 929         if (pc) kfree (pc);
 930         if (rq) kfree (rq);
 931         cmd->result = DID_ERROR << 16;
 932         done(cmd);
 933         return 1;
 934 }
 935
 936 static int idescsi_eh_abort (Scsi_Cmnd *cmd)
 937 {
 938         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 939         ide_drive_t    *drive = scsi->drive;
 940         int             busy;
 941         int             ret   = FAILED;
 942
 943         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 944
 945         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 946                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 947
 948         if (!drive) {
 949                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 950                 WARN_ON(1);
 951                 goto no_drive;
 952         }
 953
 954         /* First give it some more time, how much is "right" is hard to say :-( */
 955
 956         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 957         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 958                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 959
 960         spin_lock_irq(&ide_lock);
 961
 962         /* If there is no pc running we're done (our interrupt took care of it) */
 963         if (!scsi->pc) {
 964                 ret = SUCCESS;
 965                 goto ide_unlock;
 966         }
 967
 968         /* It's somewhere in flight. Does ide subsystem agree? */
 969         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 970             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 971                 /*
 972                  * FIXME - not sure this condition can ever occur
 973                  */
 974                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 975
 976                 idescsi_free_bio(scsi->pc->rq->bio);
 977                 if (scsi->pc->rq->flags & REQ_SENSE)
 978                         kfree(scsi->pc->buffer);
 979                 kfree(scsi->pc->rq);
 980                 kfree(scsi->pc);
 981                 scsi->pc = NULL;
 982
 983                 ret = SUCCESS;
 984         }
 985
 986 ide_unlock:
 987         spin_unlock_irq(&ide_lock);
 988 no_drive:
 989         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 990                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 991
 992         return ret;
 993 }
 994
 995 static int idescsi_eh_reset (Scsi_Cmnd *cmd)
 996 {
 997         struct request *req;
 998         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 999         ide_drive_t    *drive = scsi->drive;
1000         int             ready = 0;
1001         int             ret   = SUCCESS;
1002
1003         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
1004
1005         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
1006                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
1007
1008         if (!drive) {
1009                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
1010                 WARN_ON(1);
1011                 return FAILED;
1012         }
1013
1014         spin_lock_irq(&ide_lock);
1015
1016         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
1017                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
1018                 spin_unlock(&ide_lock);
1019                 return FAILED;
1020         }
1021
1022         /* kill current request */
1023         blkdev_dequeue_request(req);
1024         end_that_request_last(req);
1025         idescsi_free_bio(req->bio);
1026         if (req->flags & REQ_SENSE)
1027                 kfree(scsi->pc->buffer);
1028         kfree(scsi->pc);
1029         scsi->pc = NULL;
1030         kfree(req);
1031
1032         /* now nuke the drive queue */
1033         while ((req = elv_next_request(drive->queue))) {
1034                 blkdev_dequeue_request(req);
1035                 end_that_request_last(req);
1036         }
1037
1038         HWGROUP(drive)->rq = NULL;
1039         HWGROUP(drive)->handler = NULL;
1040         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
1041         spin_unlock_irq(&ide_lock);
1042
1043         ide_do_reset(drive);
1044
1045         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
1046
1047         do {
1048                 set_current_state(TASK_UNINTERRUPTIBLE);
1049                 spin_unlock_irq(cmd->device->host->host_lock);
1050                 schedule_timeout(HZ/20);
1051                 spin_lock_irq(cmd->device->host->host_lock);
1052         } while ( HWGROUP(drive)->handler );
1053
1054         ready = drive_is_ready(drive);
1055         HWGROUP(drive)->busy--;
1056         if (!ready) {
1057                 printk (KERN_ERR "ide-scsi: reset failed!\n");
1058                 ret = FAILED;
1059         }
1060
1061         return ret;
1062 }
1063
1064 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
1065                 sector_t capacity, int *parm)
1066 {
1067         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
1068         ide_drive_t *drive = idescsi->drive;
1069
1070         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
1071                 parm[0] = drive->bios_head;
1072                 parm[1] = drive->bios_sect;
1073                 parm[2] = drive->bios_cyl;
1074         }
1075         return 0;
1076 }
1077
1078 static Scsi_Host_Template idescsi_template = {
1079         .module                 = THIS_MODULE,
1080         .name                   = "idescsi",
1081         .info                   = idescsi_info,
1082         .slave_configure        = idescsi_slave_configure,
1083         .ioctl                  = idescsi_ioctl,
1084         .queuecommand           = idescsi_queue,
1085         .eh_abort_handler       = idescsi_eh_abort,
1086         .eh_host_reset_handler  = idescsi_eh_reset,
1087         .bios_param             = idescsi_bios,
1088         .can_queue              = 40,
1089         .this_id                = -1,
1090         .sg_tablesize           = 256,
1091         .cmd_per_lun            = 5,
1092         .max_sectors            = 128,
1093         .use_clustering         = DISABLE_CLUSTERING,
1094         .emulated               = 1,
1095         .proc_name              = "ide-scsi",
1096 };
1097
1098 static int idescsi_attach(ide_drive_t *drive)
1099 {
1100         idescsi_scsi_t *idescsi;
1101         struct Scsi_Host *host;
1102         static int warned;
1103         int err;
1104
1105         if (!warned && drive->media == ide_cdrom) {
1106                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
1107                 warned = 1;
1108         }
1109
1110         if (!strstr("ide-scsi", drive->driver_req) ||
1111             !drive->present ||
1112             drive->media == ide_disk ||
1113             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
1114                 return 1;
1115
1116         host->max_id = 1;
1117
1118 #if IDESCSI_DEBUG_LOG
1119         if (drive->id->last_lun)
1120                 printk(KERN_NOTICE "%s: id->last_lun=%u\n", drive->name, drive->id->last_lun);
1121 #endif
1122         if ((drive->id->last_lun & 0x7) != 7)
1123                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
1124         else
1125                 host->max_lun = 1;
1126
1127         drive->driver_data = host;
1128         idescsi = scsihost_to_idescsi(host);
1129         idescsi->drive = drive;
1130         err = ide_register_subdriver(drive, &idescsi_driver);
1131         if (!err) {
1132                 idescsi_setup (drive, idescsi);
1133                 drive->disk->fops = &idescsi_ops;
1134                 err = scsi_add_host(host, &drive->gendev);
1135                 if (!err) {
1136                         scsi_scan_host(host);
1137                         return 0;
1138                 }
1139                 /* fall through on error */
1140                 ide_unregister_subdriver(drive);
1141         }
1142
1143         scsi_host_put(host);
1144         return err;
1145 }
1146
1147 static int __init init_idescsi_module(void)
1148 {
1149         return ide_register_driver(&idescsi_driver);
1150 }
1151
1152 static void __exit exit_idescsi_module(void)
1153 {
1154         ide_unregister_driver(&idescsi_driver);
1155 }
1156
1157 module_init(init_idescsi_module);
1158 module_exit(exit_idescsi_module);
1159 MODULE_LICENSE("GPL");