drivers/scsi/ide-scsi.c

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