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   1 /*
   2  * Copyright (C) 1996-1999  Gadi Oxman <gadio@netvision.net.il>
   3  * Copyright (C) 2004-2005  Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  * Emulation of a SCSI host adapter for IDE ATAPI devices.
   8  *
   9  * With this driver, one can use the Linux SCSI drivers instead of the
  10  * native IDE ATAPI drivers.
  11  *
  12  * Ver 0.1   Dec  3 96   Initial version.
  13  * Ver 0.2   Jan 26 97   Fixed bug in cleanup_module() and added emulation
  14  *                        of MODE_SENSE_6/MODE_SELECT_6 for cdroms. Thanks
  15  *                        to Janos Farkas for pointing this out.
  16  *                       Avoid using bitfields in structures for m68k.
  17  *                       Added Scatter/Gather and DMA support.
  18  * Ver 0.4   Dec  7 97   Add support for ATAPI PD/CD drives.
  19  *                       Use variable timeout for each command.
  20  * Ver 0.5   Jan  2 98   Fix previous PD/CD support.
  21  *                       Allow disabling of SCSI-6 to SCSI-10 transformation.
  22  * Ver 0.6   Jan 27 98   Allow disabling of SCSI command translation layer
  23  *                        for access through /dev/sg.
  24  *                       Fix MODE_SENSE_6/MODE_SELECT_6/INQUIRY translation.
  25  * Ver 0.7   Dec 04 98   Ignore commands where lun != 0 to avoid multiple
  26  *                        detection of devices with CONFIG_SCSI_MULTI_LUN
  27  * Ver 0.8   Feb 05 99   Optical media need translation too. Reverse 0.7.
  28  * Ver 0.9   Jul 04 99   Fix a bug in SG_SET_TRANSFORM.
  29  * Ver 0.91  Jun 10 02   Fix "off by one" error in transforms
  30  * Ver 0.92  Dec 31 02   Implement new SCSI mid level API
  31  */
  32
  33 #define IDESCSI_VERSION "0.92"
  34
  35 #include <linux/module.h>
  36 #include <linux/types.h>
  37 #include <linux/string.h>
  38 #include <linux/kernel.h>
  39 #include <linux/mm.h>
  40 #include <linux/ioport.h>
  41 #include <linux/blkdev.h>
  42 #include <linux/errno.h>
  43 #include <linux/hdreg.h>
  44 #include <linux/slab.h>
  45 #include <linux/ide.h>
  46 #include <linux/scatterlist.h>
  47 #include <linux/delay.h>
  48 #include <linux/mutex.h>
  49 #include <linux/bitops.h>
  50
  51 #include <asm/io.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 #if IDESCSI_DEBUG_LOG
  64 #define debug_log(fmt, args...) \
  65         printk(KERN_INFO "ide-scsi: " fmt, ## args)
  66 #else
  67 #define debug_log(fmt, args...) do {} while (0)
  68 #endif
  69
  70 /*
  71  *      SCSI command transformation layer
  72  */
  73 #define IDESCSI_SG_TRANSFORM            1       /* /dev/sg transformation */
  74
  75 /*
  76  *      Log flags
  77  */
  78 #define IDESCSI_LOG_CMD                 0       /* Log SCSI commands */
  79
  80 typedef struct ide_scsi_obj {
  81         ide_drive_t             *drive;
  82         ide_driver_t            *driver;
  83         struct gendisk          *disk;
  84         struct Scsi_Host        *host;
  85
  86         struct ide_atapi_pc *pc;                /* Current packet command */
  87         unsigned long flags;                    /* Status/Action flags */
  88         unsigned long transform;                /* SCSI cmd translation layer */
  89         unsigned long log;                      /* log flags */
  90 } idescsi_scsi_t;
  91
  92 static DEFINE_MUTEX(idescsi_ref_mutex);
  93 /* Set by module param to skip cd */
  94 static int idescsi_nocd;
  95
  96 #define ide_scsi_g(disk) \
  97         container_of((disk)->private_data, struct ide_scsi_obj, driver)
  98
  99 static struct ide_scsi_obj *ide_scsi_get(struct gendisk *disk)
 100 {
 101         struct ide_scsi_obj *scsi = NULL;
 102
 103         mutex_lock(&idescsi_ref_mutex);
 104         scsi = ide_scsi_g(disk);
 105         if (scsi)
 106                 scsi_host_get(scsi->host);
 107         mutex_unlock(&idescsi_ref_mutex);
 108         return scsi;
 109 }
 110
 111 static void ide_scsi_put(struct ide_scsi_obj *scsi)
 112 {
 113         mutex_lock(&idescsi_ref_mutex);
 114         scsi_host_put(scsi->host);
 115         mutex_unlock(&idescsi_ref_mutex);
 116 }
 117
 118 static inline idescsi_scsi_t *scsihost_to_idescsi(struct Scsi_Host *host)
 119 {
 120         return (idescsi_scsi_t*) (&host[1]);
 121 }
 122
 123 static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive)
 124 {
 125         return scsihost_to_idescsi(ide_drive->driver_data);
 126 }
 127
 128 /*
 129  *      Per ATAPI device status bits.
 130  */
 131 #define IDESCSI_DRQ_INTERRUPT           0       /* DRQ interrupt device */
 132
 133 /*
 134  *      ide-scsi requests.
 135  */
 136 #define IDESCSI_PC_RQ                   90
 137
 138 /*
 139  *      PIO data transfer routine using the scatter gather table.
 140  */
 141 static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
 142                                 unsigned int bcount, int write)
 143 {
 144         ide_hwif_t *hwif = drive->hwif;
 145         xfer_func_t *xf = write ? hwif->output_data : hwif->input_data;
 146         char *buf;
 147         int count;
 148
 149         while (bcount) {
 150                 count = min(pc->sg->length - pc->b_count, bcount);
 151                 if (PageHighMem(sg_page(pc->sg))) {
 152                         unsigned long flags;
 153
 154                         local_irq_save(flags);
 155                         buf = kmap_atomic(sg_page(pc->sg), KM_IRQ0) +
 156                                           pc->sg->offset;
 157                         xf(drive, NULL, buf + pc->b_count, count);
 158                         kunmap_atomic(buf - pc->sg->offset, KM_IRQ0);
 159                         local_irq_restore(flags);
 160                 } else {
 161                         buf = sg_virt(pc->sg);
 162                         xf(drive, NULL, buf + pc->b_count, count);
 163                 }
 164                 bcount -= count; pc->b_count += count;
 165                 if (pc->b_count == pc->sg->length) {
 166                         if (!--pc->sg_cnt)
 167                                 break;
 168                         pc->sg = sg_next(pc->sg);
 169                         pc->b_count = 0;
 170                 }
 171         }
 172
 173         if (bcount) {
 174                 printk(KERN_ERR "%s: scatter gather table too small, %s\n",
 175                                 drive->name, write ? "padding with zeros"
 176                                                    : "discarding data");
 177                 ide_pad_transfer(drive, write, bcount);
 178         }
 179 }
 180
 181 static void ide_scsi_hex_dump(u8 *data, int len)
 182 {
 183         print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
 184 }
 185
 186 static int idescsi_check_condition(ide_drive_t *drive,
 187                 struct request *failed_cmd)
 188 {
 189         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 190         struct ide_atapi_pc   *pc;
 191         struct request *rq;
 192         u8             *buf;
 193
 194         /* stuff a sense request in front of our current request */
 195         pc = kzalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 196         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 197         buf = kzalloc(SCSI_SENSE_BUFFERSIZE, GFP_ATOMIC);
 198         if (!pc || !rq || !buf) {
 199                 kfree(buf);
 200                 kfree(rq);
 201                 kfree(pc);
 202                 return -ENOMEM;
 203         }
 204         blk_rq_init(NULL, rq);
 205         rq->special = (char *) pc;
 206         pc->rq = rq;
 207         pc->buf = buf;
 208         pc->c[0] = REQUEST_SENSE;
 209         pc->c[4] = pc->req_xfer = pc->buf_size = SCSI_SENSE_BUFFERSIZE;
 210         rq->cmd_type = REQ_TYPE_SENSE;
 211         rq->cmd_flags |= REQ_PREEMPT;
 212         pc->timeout = jiffies + WAIT_READY;
 213         /* NOTE! Save the failed packet command in "rq->buffer" */
 214         rq->buffer = (void *) failed_cmd->special;
 215         pc->scsi_cmd = ((struct ide_atapi_pc *) failed_cmd->special)->scsi_cmd;
 216         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 217                 printk ("ide-scsi: %s: queue cmd = ", drive->name);
 218                 ide_scsi_hex_dump(pc->c, 6);
 219         }
 220         rq->rq_disk = scsi->disk;
 221         ide_do_drive_cmd(drive, rq);
 222         return 0;
 223 }
 224
 225 static int idescsi_end_request(ide_drive_t *, int, int);
 226
 227 static ide_startstop_t
 228 idescsi_atapi_error(ide_drive_t *drive, struct request *rq, u8 stat, u8 err)
 229 {
 230         ide_hwif_t *hwif = drive->hwif;
 231
 232         if (ide_read_status(drive) & (BUSY_STAT | DRQ_STAT))
 233                 /* force an abort */
 234                 hwif->OUTBSYNC(hwif, WIN_IDLEIMMEDIATE,
 235                                hwif->io_ports.command_addr);
 236
 237         rq->errors++;
 238
 239         idescsi_end_request(drive, 0, 0);
 240
 241         return ide_stopped;
 242 }
 243
 244 static ide_startstop_t
 245 idescsi_atapi_abort(ide_drive_t *drive, struct request *rq)
 246 {
 247         debug_log("%s called for %lu\n", __func__,
 248                 ((struct ide_atapi_pc *) rq->special)->scsi_cmd->serial_number);
 249
 250         rq->errors |= ERROR_MAX;
 251
 252         idescsi_end_request(drive, 0, 0);
 253
 254         return ide_stopped;
 255 }
 256
 257 static int idescsi_end_request (ide_drive_t *drive, int uptodate, int nrsecs)
 258 {
 259         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 260         struct request *rq = HWGROUP(drive)->rq;
 261         struct ide_atapi_pc *pc = (struct ide_atapi_pc *) rq->special;
 262         int log = test_bit(IDESCSI_LOG_CMD, &scsi->log);
 263         struct Scsi_Host *host;
 264         int errors = rq->errors;
 265         unsigned long flags;
 266
 267         if (!blk_special_request(rq) && !blk_sense_request(rq)) {
 268                 ide_end_request(drive, uptodate, nrsecs);
 269                 return 0;
 270         }
 271         ide_end_drive_cmd (drive, 0, 0);
 272         if (blk_sense_request(rq)) {
 273                 struct ide_atapi_pc *opc = (struct ide_atapi_pc *) rq->buffer;
 274                 if (log) {
 275                         printk ("ide-scsi: %s: wrap up check %lu, rst = ", drive->name, opc->scsi_cmd->serial_number);
 276                         ide_scsi_hex_dump(pc->buf, 16);
 277                 }
 278                 memcpy((void *) opc->scsi_cmd->sense_buffer, pc->buf,
 279                         SCSI_SENSE_BUFFERSIZE);
 280                 kfree(pc->buf);
 281                 kfree(pc);
 282                 kfree(rq);
 283                 pc = opc;
 284                 rq = pc->rq;
 285                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) |
 286                                 (((pc->flags & PC_FLAG_TIMEDOUT) ?
 287                                   DID_TIME_OUT :
 288                                   DID_OK) << 16);
 289         } else if (pc->flags & PC_FLAG_TIMEDOUT) {
 290                 if (log)
 291                         printk (KERN_WARNING "ide-scsi: %s: timed out for %lu\n",
 292                                         drive->name, pc->scsi_cmd->serial_number);
 293                 pc->scsi_cmd->result = DID_TIME_OUT << 16;
 294         } else if (errors >= ERROR_MAX) {
 295                 pc->scsi_cmd->result = DID_ERROR << 16;
 296                 if (log)
 297                         printk ("ide-scsi: %s: I/O error for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 298         } else if (errors) {
 299                 if (log)
 300                         printk ("ide-scsi: %s: check condition for %lu\n", drive->name, pc->scsi_cmd->serial_number);
 301                 if (!idescsi_check_condition(drive, rq))
 302                         /* we started a request sense, so we'll be back, exit for now */
 303                         return 0;
 304                 pc->scsi_cmd->result = (CHECK_CONDITION << 1) | (DID_OK << 16);
 305         } else {
 306                 pc->scsi_cmd->result = DID_OK << 16;
 307         }
 308         host = pc->scsi_cmd->device->host;
 309         spin_lock_irqsave(host->host_lock, flags);
 310         pc->done(pc->scsi_cmd);
 311         spin_unlock_irqrestore(host->host_lock, flags);
 312         kfree(pc);
 313         kfree(rq);
 314         scsi->pc = NULL;
 315         return 0;
 316 }
 317
 318 static inline unsigned long get_timeout(struct ide_atapi_pc *pc)
 319 {
 320         return max_t(unsigned long, WAIT_CMD, pc->timeout - jiffies);
 321 }
 322
 323 static int idescsi_expiry(ide_drive_t *drive)
 324 {
 325         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 326         struct ide_atapi_pc   *pc   = scsi->pc;
 327
 328         debug_log("%s called for %lu at %lu\n", __func__,
 329                   pc->scsi_cmd->serial_number, jiffies);
 330
 331         pc->flags |= PC_FLAG_TIMEDOUT;
 332
 333         return 0;                                       /* we do not want the ide subsystem to retry */
 334 }
 335
 336 /*
 337  *      Our interrupt handler.
 338  */
 339 static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 340 {
 341         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 342         ide_hwif_t *hwif = drive->hwif;
 343         struct ide_atapi_pc *pc = scsi->pc;
 344         struct request *rq = pc->rq;
 345         xfer_func_t *xferfunc;
 346         unsigned int temp;
 347         u16 bcount;
 348         u8 stat, ireason;
 349
 350         debug_log("Reached %s interrupt handler\n", __func__);
 351
 352         if (pc->flags & PC_FLAG_TIMEDOUT) {
 353                 debug_log("%s: got timed out packet %lu at %lu\n", __func__,
 354                           pc->scsi_cmd->serial_number, jiffies);
 355                 /* end this request now - scsi should retry it*/
 356                 idescsi_end_request (drive, 1, 0);
 357                 return ide_stopped;
 358         }
 359         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 360                 if (hwif->dma_ops->dma_end(drive))
 361                         pc->flags |= PC_FLAG_DMA_ERROR;
 362                 else
 363                         pc->xferred = pc->req_xfer;
 364                 debug_log("%s: DMA finished\n", drive->name);
 365         }
 366
 367         /* Clear the interrupt */
 368         stat = ide_read_status(drive);
 369
 370         if ((stat & DRQ_STAT) == 0) {
 371                 /* No more interrupts */
 372                 if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 373                         printk(KERN_INFO "Packet command completed, %d bytes"
 374                                         " transferred\n", pc->xferred);
 375                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 376                 local_irq_enable_in_hardirq();
 377                 if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR))
 378                         rq->errors++;
 379                 idescsi_end_request (drive, 1, 0);
 380                 return ide_stopped;
 381         }
 382         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 383                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 384                 printk(KERN_ERR "%s: The device wants to issue more interrupts "
 385                                 "in DMA mode\n", drive->name);
 386                 ide_dma_off(drive);
 387                 return ide_do_reset(drive);
 388         }
 389         bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
 390                   hwif->INB(hwif->io_ports.lbam_addr);
 391         ireason = hwif->INB(hwif->io_ports.nsect_addr);
 392
 393         if (ireason & CD) {
 394                 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
 395                 return ide_do_reset (drive);
 396         }
 397         if (((ireason & IO) == IO) == !!(pc->flags & PC_FLAG_WRITING)) {
 398                 /* Hopefully, we will never get here */
 399                 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
 400                                 "to %s!\n", drive->name,
 401                                 (ireason & IO) ? "Write" : "Read",
 402                                 (ireason & IO) ? "Read" : "Write");
 403                 return ide_do_reset(drive);
 404         }
 405         if (!(pc->flags & PC_FLAG_WRITING)) {
 406                 temp = pc->xferred + bcount;
 407                 if (temp > pc->req_xfer) {
 408                         if (temp > pc->buf_size) {
 409                                 printk(KERN_ERR "%s: The device wants to send "
 410                                                 "us more data than expected - "
 411                                                 "discarding data\n",
 412                                                 drive->name);
 413                                 temp = pc->buf_size - pc->xferred;
 414                                 if (temp) {
 415                                         if (pc->sg)
 416                                                 ide_scsi_io_buffers(drive, pc,
 417                                                                     temp, 0);
 418                                         else
 419                                                 hwif->input_data(drive, NULL,
 420                                                         pc->cur_pos, temp);
 421                                         printk(KERN_ERR "%s: transferred %d of "
 422                                                         "%d bytes\n",
 423                                                         drive->name,
 424                                                         temp, bcount);
 425                                 }
 426                                 pc->xferred += temp;
 427                                 pc->cur_pos += temp;
 428                                 ide_pad_transfer(drive, 0, bcount - temp);
 429                                 ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 430                                 return ide_started;
 431                         }
 432                         debug_log("The device wants to send us more data than "
 433                                   "expected - allowing transfer\n");
 434                 }
 435                 xferfunc = hwif->input_data;
 436         } else
 437                 xferfunc = hwif->output_data;
 438
 439         if (pc->sg)
 440                 ide_scsi_io_buffers(drive, pc, bcount,
 441                                     !!(pc->flags & PC_FLAG_WRITING));
 442         else
 443                 xferfunc(drive, NULL, pc->cur_pos, bcount);
 444
 445         /* Update the current position */
 446         pc->xferred += bcount;
 447         pc->cur_pos += bcount;
 448
 449         /* And set the interrupt handler again */
 450         ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 451         return ide_started;
 452 }
 453
 454 static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
 455 {
 456         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 457
 458         return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
 459                                get_timeout(scsi->pc), idescsi_expiry);
 460 }
 461
 462 static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
 463 {
 464         switch (pc->c[0]) {
 465                 case READ_6: case READ_10: case READ_12:
 466                         pc->flags &= ~PC_FLAG_WRITING;
 467                         return 0;
 468                 case WRITE_6: case WRITE_10: case WRITE_12:
 469                         pc->flags |= PC_FLAG_WRITING;
 470                         return 0;
 471                 default:
 472                         return 1;
 473         }
 474 }
 475
 476 static int idescsi_map_sg(ide_drive_t *drive, struct ide_atapi_pc *pc)
 477 {
 478         ide_hwif_t *hwif = drive->hwif;
 479         struct scatterlist *sg, *scsi_sg;
 480         int segments;
 481
 482         if (!pc->req_xfer || pc->req_xfer % 1024)
 483                 return 1;
 484
 485         if (idescsi_set_direction(pc))
 486                 return 1;
 487
 488         sg = hwif->sg_table;
 489         scsi_sg = scsi_sglist(pc->scsi_cmd);
 490         segments = scsi_sg_count(pc->scsi_cmd);
 491
 492         if (segments > hwif->sg_max_nents)
 493                 return 1;
 494
 495         hwif->sg_nents = segments;
 496         memcpy(sg, scsi_sg, sizeof(*sg) * segments);
 497
 498         return 0;
 499 }
 500
 501 static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 502                 struct ide_atapi_pc *pc)
 503 {
 504         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 505
 506         /* Set the current packet command */
 507         scsi->pc = pc;
 508
 509         return ide_issue_pc(drive, pc, idescsi_transfer_pc,
 510                             get_timeout(pc), idescsi_expiry);
 511 }
 512
 513 /*
 514  *      idescsi_do_request is our request handling function.
 515  */
 516 static ide_startstop_t idescsi_do_request (ide_drive_t *drive, struct request *rq, sector_t block)
 517 {
 518         debug_log("dev: %s, cmd: %x, errors: %d\n", rq->rq_disk->disk_name,
 519                   rq->cmd[0], rq->errors);
 520         debug_log("sector: %ld, nr_sectors: %ld, current_nr_sectors: %d\n",
 521                   rq->sector, rq->nr_sectors, rq->current_nr_sectors);
 522
 523         if (blk_sense_request(rq) || blk_special_request(rq)) {
 524                 struct ide_atapi_pc *pc = (struct ide_atapi_pc *)rq->special;
 525                 idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 526
 527                 if (test_bit(IDESCSI_DRQ_INTERRUPT, &scsi->flags))
 528                         pc->flags |= PC_FLAG_DRQ_INTERRUPT;
 529
 530                 if (drive->using_dma && !idescsi_map_sg(drive, pc))
 531                         pc->flags |= PC_FLAG_DMA_OK;
 532
 533                 return idescsi_issue_pc(drive, pc);
 534         }
 535         blk_dump_rq_flags(rq, "ide-scsi: unsup command");
 536         idescsi_end_request (drive, 0, 0);
 537         return ide_stopped;
 538 }
 539
 540 #ifdef CONFIG_IDE_PROC_FS
 541 static void idescsi_add_settings(ide_drive_t *drive)
 542 {
 543         idescsi_scsi_t *scsi = drive_to_idescsi(drive);
 544
 545 /*
 546  *                      drive   setting name    read/write      data type       min     max     mul_factor      div_factor      data pointer            set function
 547  */
 548         ide_add_setting(drive,  "bios_cyl",     SETTING_RW,     TYPE_INT,       0,      1023,   1,              1,              &drive->bios_cyl,       NULL);
 549         ide_add_setting(drive,  "bios_head",    SETTING_RW,     TYPE_BYTE,      0,      255,    1,              1,              &drive->bios_head,      NULL);
 550         ide_add_setting(drive,  "bios_sect",    SETTING_RW,     TYPE_BYTE,      0,      63,     1,              1,              &drive->bios_sect,      NULL);
 551         ide_add_setting(drive,  "transform",    SETTING_RW,     TYPE_INT,       0,      3,      1,              1,              &scsi->transform,       NULL);
 552         ide_add_setting(drive,  "log",          SETTING_RW,     TYPE_INT,       0,      1,      1,              1,              &scsi->log,             NULL);
 553 }
 554 #else
 555 static inline void idescsi_add_settings(ide_drive_t *drive) { ; }
 556 #endif
 557
 558 /*
 559  *      Driver initialization.
 560  */
 561 static void idescsi_setup (ide_drive_t *drive, idescsi_scsi_t *scsi)
 562 {
 563         if (drive->id && (drive->id->config & 0x0060) == 0x20)
 564                 set_bit (IDESCSI_DRQ_INTERRUPT, &scsi->flags);
 565         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 566 #if IDESCSI_DEBUG_LOG
 567         set_bit(IDESCSI_LOG_CMD, &scsi->log);
 568 #endif /* IDESCSI_DEBUG_LOG */
 569         idescsi_add_settings(drive);
 570 }
 571
 572 static void ide_scsi_remove(ide_drive_t *drive)
 573 {
 574         struct Scsi_Host *scsihost = drive->driver_data;
 575         struct ide_scsi_obj *scsi = scsihost_to_idescsi(scsihost);
 576         struct gendisk *g = scsi->disk;
 577
 578         scsi_remove_host(scsihost);
 579         ide_proc_unregister_driver(drive, scsi->driver);
 580
 581         ide_unregister_region(g);
 582
 583         drive->driver_data = NULL;
 584         g->private_data = NULL;
 585         put_disk(g);
 586
 587         ide_scsi_put(scsi);
 588
 589         drive->scsi = 0;
 590 }
 591
 592 static int ide_scsi_probe(ide_drive_t *);
 593
 594 #ifdef CONFIG_IDE_PROC_FS
 595 static ide_proc_entry_t idescsi_proc[] = {
 596         { "capacity", S_IFREG|S_IRUGO, proc_ide_read_capacity, NULL },
 597         { NULL, 0, NULL, NULL }
 598 };
 599 #endif
 600
 601 static ide_driver_t idescsi_driver = {
 602         .gen_driver = {
 603                 .owner          = THIS_MODULE,
 604                 .name           = "ide-scsi",
 605                 .bus            = &ide_bus_type,
 606         },
 607         .probe                  = ide_scsi_probe,
 608         .remove                 = ide_scsi_remove,
 609         .version                = IDESCSI_VERSION,
 610         .media                  = ide_scsi,
 611         .supports_dsc_overlap   = 0,
 612         .do_request             = idescsi_do_request,
 613         .end_request            = idescsi_end_request,
 614         .error                  = idescsi_atapi_error,
 615         .abort                  = idescsi_atapi_abort,
 616 #ifdef CONFIG_IDE_PROC_FS
 617         .proc                   = idescsi_proc,
 618 #endif
 619 };
 620
 621 static int idescsi_ide_open(struct inode *inode, struct file *filp)
 622 {
 623         struct gendisk *disk = inode->i_bdev->bd_disk;
 624         struct ide_scsi_obj *scsi;
 625
 626         if (!(scsi = ide_scsi_get(disk)))
 627                 return -ENXIO;
 628
 629         return 0;
 630 }
 631
 632 static int idescsi_ide_release(struct inode *inode, struct file *filp)
 633 {
 634         struct gendisk *disk = inode->i_bdev->bd_disk;
 635         struct ide_scsi_obj *scsi = ide_scsi_g(disk);
 636
 637         ide_scsi_put(scsi);
 638
 639         return 0;
 640 }
 641
 642 static int idescsi_ide_ioctl(struct inode *inode, struct file *file,
 643                         unsigned int cmd, unsigned long arg)
 644 {
 645         struct block_device *bdev = inode->i_bdev;
 646         struct ide_scsi_obj *scsi = ide_scsi_g(bdev->bd_disk);
 647         return generic_ide_ioctl(scsi->drive, file, bdev, cmd, arg);
 648 }
 649
 650 static struct block_device_operations idescsi_ops = {
 651         .owner          = THIS_MODULE,
 652         .open           = idescsi_ide_open,
 653         .release        = idescsi_ide_release,
 654         .ioctl          = idescsi_ide_ioctl,
 655 };
 656
 657 static int idescsi_slave_configure(struct scsi_device * sdp)
 658 {
 659         /* Configure detected device */
 660         sdp->use_10_for_rw = 1;
 661         sdp->use_10_for_ms = 1;
 662         scsi_adjust_queue_depth(sdp, MSG_SIMPLE_TAG, sdp->host->cmd_per_lun);
 663         return 0;
 664 }
 665
 666 static const char *idescsi_info (struct Scsi_Host *host)
 667 {
 668         return "SCSI host adapter emulation for IDE ATAPI devices";
 669 }
 670
 671 static int idescsi_ioctl (struct scsi_device *dev, int cmd, void __user *arg)
 672 {
 673         idescsi_scsi_t *scsi = scsihost_to_idescsi(dev->host);
 674
 675         if (cmd == SG_SET_TRANSFORM) {
 676                 if (arg)
 677                         set_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 678                 else
 679                         clear_bit(IDESCSI_SG_TRANSFORM, &scsi->transform);
 680                 return 0;
 681         } else if (cmd == SG_GET_TRANSFORM)
 682                 return put_user(test_bit(IDESCSI_SG_TRANSFORM, &scsi->transform), (int __user *) arg);
 683         return -EINVAL;
 684 }
 685
 686 static int idescsi_queue (struct scsi_cmnd *cmd,
 687                 void (*done)(struct scsi_cmnd *))
 688 {
 689         struct Scsi_Host *host = cmd->device->host;
 690         idescsi_scsi_t *scsi = scsihost_to_idescsi(host);
 691         ide_drive_t *drive = scsi->drive;
 692         struct request *rq = NULL;
 693         struct ide_atapi_pc *pc = NULL;
 694
 695         if (!drive) {
 696                 scmd_printk (KERN_ERR, cmd, "drive not present\n");
 697                 goto abort;
 698         }
 699         scsi = drive_to_idescsi(drive);
 700         pc = kmalloc(sizeof(struct ide_atapi_pc), GFP_ATOMIC);
 701         rq = kmalloc(sizeof(struct request), GFP_ATOMIC);
 702         if (rq == NULL || pc == NULL) {
 703                 printk (KERN_ERR "ide-scsi: %s: out of memory\n", drive->name);
 704                 goto abort;
 705         }
 706
 707         memset (pc->c, 0, 12);
 708         pc->flags = 0;
 709         if (cmd->sc_data_direction == DMA_TO_DEVICE)
 710                 pc->flags |= PC_FLAG_WRITING;
 711         pc->rq = rq;
 712         memcpy (pc->c, cmd->cmnd, cmd->cmd_len);
 713         pc->buf = NULL;
 714         pc->sg = scsi_sglist(cmd);
 715         pc->sg_cnt = scsi_sg_count(cmd);
 716         pc->b_count = 0;
 717         pc->req_xfer = pc->buf_size = scsi_bufflen(cmd);
 718         pc->scsi_cmd = cmd;
 719         pc->done = done;
 720         pc->timeout = jiffies + cmd->timeout_per_command;
 721
 722         if (test_bit(IDESCSI_LOG_CMD, &scsi->log)) {
 723                 printk ("ide-scsi: %s: que %lu, cmd = ", drive->name, cmd->serial_number);
 724                 ide_scsi_hex_dump(cmd->cmnd, cmd->cmd_len);
 725                 if (memcmp(pc->c, cmd->cmnd, cmd->cmd_len)) {
 726                         printk ("ide-scsi: %s: que %lu, tsl = ", drive->name, cmd->serial_number);
 727                         ide_scsi_hex_dump(pc->c, 12);
 728                 }
 729         }
 730
 731         blk_rq_init(NULL, rq);
 732         rq->special = (char *) pc;
 733         rq->cmd_type = REQ_TYPE_SPECIAL;
 734         spin_unlock_irq(host->host_lock);
 735         blk_execute_rq_nowait(drive->queue, scsi->disk, rq, 0, NULL);
 736         spin_lock_irq(host->host_lock);
 737         return 0;
 738 abort:
 739         kfree (pc);
 740         kfree (rq);
 741         cmd->result = DID_ERROR << 16;
 742         done(cmd);
 743         return 0;
 744 }
 745
 746 static int idescsi_eh_abort (struct scsi_cmnd *cmd)
 747 {
 748         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 749         ide_drive_t    *drive = scsi->drive;
 750         int             busy;
 751         int             ret   = FAILED;
 752
 753         /* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */
 754
 755         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 756                 printk (KERN_WARNING "ide-scsi: abort called for %lu\n", cmd->serial_number);
 757
 758         if (!drive) {
 759                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_abort\n");
 760                 WARN_ON(1);
 761                 goto no_drive;
 762         }
 763
 764         /* First give it some more time, how much is "right" is hard to say :-( */
 765
 766         busy = ide_wait_not_busy(HWIF(drive), 100);     /* FIXME - uses mdelay which causes latency? */
 767         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 768                 printk (KERN_WARNING "ide-scsi: drive did%s become ready\n", busy?" not":"");
 769
 770         spin_lock_irq(&ide_lock);
 771
 772         /* If there is no pc running we're done (our interrupt took care of it) */
 773         if (!scsi->pc) {
 774                 ret = SUCCESS;
 775                 goto ide_unlock;
 776         }
 777
 778         /* It's somewhere in flight. Does ide subsystem agree? */
 779         if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
 780             elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
 781                 /*
 782                  * FIXME - not sure this condition can ever occur
 783                  */
 784                 printk (KERN_ERR "ide-scsi: cmd aborted!\n");
 785
 786                 if (blk_sense_request(scsi->pc->rq))
 787                         kfree(scsi->pc->buf);
 788                 kfree(scsi->pc->rq);
 789                 kfree(scsi->pc);
 790                 scsi->pc = NULL;
 791
 792                 ret = SUCCESS;
 793         }
 794
 795 ide_unlock:
 796         spin_unlock_irq(&ide_lock);
 797 no_drive:
 798         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 799                 printk (KERN_WARNING "ide-scsi: abort returns %s\n", ret == SUCCESS?"success":"failed");
 800
 801         return ret;
 802 }
 803
 804 static int idescsi_eh_reset (struct scsi_cmnd *cmd)
 805 {
 806         struct request *req;
 807         idescsi_scsi_t *scsi  = scsihost_to_idescsi(cmd->device->host);
 808         ide_drive_t    *drive = scsi->drive;
 809         int             ready = 0;
 810         int             ret   = SUCCESS;
 811
 812         /* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */
 813
 814         if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 815                 printk (KERN_WARNING "ide-scsi: reset called for %lu\n", cmd->serial_number);
 816
 817         if (!drive) {
 818                 printk (KERN_WARNING "ide-scsi: Drive not set in idescsi_eh_reset\n");
 819                 WARN_ON(1);
 820                 return FAILED;
 821         }
 822
 823         spin_lock_irq(cmd->device->host->host_lock);
 824         spin_lock(&ide_lock);
 825
 826         if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
 827                 printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
 828                 spin_unlock(&ide_lock);
 829                 spin_unlock_irq(cmd->device->host->host_lock);
 830                 return FAILED;
 831         }
 832
 833         /* kill current request */
 834         if (__blk_end_request(req, -EIO, 0))
 835                 BUG();
 836         if (blk_sense_request(req))
 837                 kfree(scsi->pc->buf);
 838         kfree(scsi->pc);
 839         scsi->pc = NULL;
 840         kfree(req);
 841
 842         /* now nuke the drive queue */
 843         while ((req = elv_next_request(drive->queue))) {
 844                 if (__blk_end_request(req, -EIO, 0))
 845                         BUG();
 846         }
 847
 848         HWGROUP(drive)->rq = NULL;
 849         HWGROUP(drive)->handler = NULL;
 850         HWGROUP(drive)->busy = 1;               /* will set this to zero when ide reset finished */
 851         spin_unlock(&ide_lock);
 852
 853         ide_do_reset(drive);
 854
 855         /* ide_do_reset starts a polling handler which restarts itself every 50ms until the reset finishes */
 856
 857         do {
 858                 spin_unlock_irq(cmd->device->host->host_lock);
 859                 msleep(50);
 860                 spin_lock_irq(cmd->device->host->host_lock);
 861         } while ( HWGROUP(drive)->handler );
 862
 863         ready = drive_is_ready(drive);
 864         HWGROUP(drive)->busy--;
 865         if (!ready) {
 866                 printk (KERN_ERR "ide-scsi: reset failed!\n");
 867                 ret = FAILED;
 868         }
 869
 870         spin_unlock_irq(cmd->device->host->host_lock);
 871         return ret;
 872 }
 873
 874 static int idescsi_bios(struct scsi_device *sdev, struct block_device *bdev,
 875                 sector_t capacity, int *parm)
 876 {
 877         idescsi_scsi_t *idescsi = scsihost_to_idescsi(sdev->host);
 878         ide_drive_t *drive = idescsi->drive;
 879
 880         if (drive->bios_cyl && drive->bios_head && drive->bios_sect) {
 881                 parm[0] = drive->bios_head;
 882                 parm[1] = drive->bios_sect;
 883                 parm[2] = drive->bios_cyl;
 884         }
 885         return 0;
 886 }
 887
 888 static struct scsi_host_template idescsi_template = {
 889         .module                 = THIS_MODULE,
 890         .name                   = "idescsi",
 891         .info                   = idescsi_info,
 892         .slave_configure        = idescsi_slave_configure,
 893         .ioctl                  = idescsi_ioctl,
 894         .queuecommand           = idescsi_queue,
 895         .eh_abort_handler       = idescsi_eh_abort,
 896         .eh_host_reset_handler  = idescsi_eh_reset,
 897         .bios_param             = idescsi_bios,
 898         .can_queue              = 40,
 899         .this_id                = -1,
 900         .sg_tablesize           = 256,
 901         .cmd_per_lun            = 5,
 902         .max_sectors            = 128,
 903         .use_clustering         = DISABLE_CLUSTERING,
 904         .emulated               = 1,
 905         .proc_name              = "ide-scsi",
 906 };
 907
 908 static int ide_scsi_probe(ide_drive_t *drive)
 909 {
 910         idescsi_scsi_t *idescsi;
 911         struct Scsi_Host *host;
 912         struct gendisk *g;
 913         static int warned;
 914         int err = -ENOMEM;
 915
 916         if (!warned && drive->media == ide_cdrom) {
 917                 printk(KERN_WARNING "ide-scsi is deprecated for cd burning! Use ide-cd and give dev=/dev/hdX as device\n");
 918                 warned = 1;
 919         }
 920
 921         if (idescsi_nocd && drive->media == ide_cdrom)
 922                 return -ENODEV;
 923
 924         if (!strstr("ide-scsi", drive->driver_req) ||
 925             !drive->present ||
 926             drive->media == ide_disk ||
 927             !(host = scsi_host_alloc(&idescsi_template,sizeof(idescsi_scsi_t))))
 928                 return -ENODEV;
 929
 930         drive->scsi = 1;
 931
 932         g = alloc_disk(1 << PARTN_BITS);
 933         if (!g)
 934                 goto out_host_put;
 935
 936         ide_init_disk(g, drive);
 937
 938         host->max_id = 1;
 939
 940         if (drive->id->last_lun)
 941                 debug_log("%s: id->last_lun=%u\n", drive->name,
 942                           drive->id->last_lun);
 943
 944         if ((drive->id->last_lun & 0x7) != 7)
 945                 host->max_lun = (drive->id->last_lun & 0x7) + 1;
 946         else
 947                 host->max_lun = 1;
 948
 949         drive->driver_data = host;
 950         idescsi = scsihost_to_idescsi(host);
 951         idescsi->drive = drive;
 952         idescsi->driver = &idescsi_driver;
 953         idescsi->host = host;
 954         idescsi->disk = g;
 955         g->private_data = &idescsi->driver;
 956         ide_proc_register_driver(drive, &idescsi_driver);
 957         err = 0;
 958         idescsi_setup(drive, idescsi);
 959         g->fops = &idescsi_ops;
 960         ide_register_region(g);
 961         err = scsi_add_host(host, &drive->gendev);
 962         if (!err) {
 963                 scsi_scan_host(host);
 964                 return 0;
 965         }
 966         /* fall through on error */
 967         ide_unregister_region(g);
 968         ide_proc_unregister_driver(drive, &idescsi_driver);
 969
 970         put_disk(g);
 971 out_host_put:
 972         drive->scsi = 0;
 973         scsi_host_put(host);
 974         return err;
 975 }
 976
 977 static int __init init_idescsi_module(void)
 978 {
 979         return driver_register(&idescsi_driver.gen_driver);
 980 }
 981
 982 static void __exit exit_idescsi_module(void)
 983 {
 984         driver_unregister(&idescsi_driver.gen_driver);
 985 }
 986
 987 module_param(idescsi_nocd, int, 0600);
 988 MODULE_PARM_DESC(idescsi_nocd, "Disable handling of CD-ROMs so they may be driven by ide-cd");
 989 module_init(init_idescsi_module);
 990 module_exit(exit_idescsi_module);
 991 MODULE_LICENSE("GPL");