drivers/ide/ide-atapi.c

   1 /*
   2  * ATAPI support.
   3  */
   4
   5 #include <linux/kernel.h>
   6 #include <linux/cdrom.h>
   7 #include <linux/delay.h>
   8 #include <linux/export.h>
   9 #include <linux/ide.h>
  10 #include <linux/scatterlist.h>
  11 #include <linux/gfp.h>
  12
  13 #include <scsi/scsi.h>
  14
  15 #define DRV_NAME "ide-atapi"
  16 #define PFX DRV_NAME ": "
  17
  18 #ifdef DEBUG
  19 #define debug_log(fmt, args...) \
  20         printk(KERN_INFO "ide: " fmt, ## args)
  21 #else
  22 #define debug_log(fmt, args...) do {} while (0)
  23 #endif
  24
  25 #define ATAPI_MIN_CDB_BYTES     12
  26
  27 static inline int dev_is_idecd(ide_drive_t *drive)
  28 {
  29         return drive->media == ide_cdrom || drive->media == ide_optical;
  30 }
  31
  32 /*
  33  * Check whether we can support a device,
  34  * based on the ATAPI IDENTIFY command results.
  35  */
  36 int ide_check_atapi_device(ide_drive_t *drive, const char *s)
  37 {
  38         u16 *id = drive->id;
  39         u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
  40
  41         *((u16 *)&gcw) = id[ATA_ID_CONFIG];
  42
  43         protocol    = (gcw[1] & 0xC0) >> 6;
  44         device_type =  gcw[1] & 0x1F;
  45         removable   = (gcw[0] & 0x80) >> 7;
  46         drq_type    = (gcw[0] & 0x60) >> 5;
  47         packet_size =  gcw[0] & 0x03;
  48
  49 #ifdef CONFIG_PPC
  50         /* kludge for Apple PowerBook internal zip */
  51         if (drive->media == ide_floppy && device_type == 5 &&
  52             !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
  53             strstr((char *)&id[ATA_ID_PROD], "ZIP"))
  54                 device_type = 0;
  55 #endif
  56
  57         if (protocol != 2)
  58                 printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
  59                         s, drive->name, protocol);
  60         else if ((drive->media == ide_floppy && device_type != 0) ||
  61                  (drive->media == ide_tape && device_type != 1))
  62                 printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
  63                         s, drive->name, device_type);
  64         else if (removable == 0)
  65                 printk(KERN_ERR "%s: %s: the removable flag is not set\n",
  66                         s, drive->name);
  67         else if (drive->media == ide_floppy && drq_type == 3)
  68                 printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
  69                         "supported\n", s, drive->name, drq_type);
  70         else if (packet_size != 0)
  71                 printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
  72                         "bytes\n", s, drive->name, packet_size);
  73         else
  74                 return 1;
  75         return 0;
  76 }
  77 EXPORT_SYMBOL_GPL(ide_check_atapi_device);
  78
  79 void ide_init_pc(struct ide_atapi_pc *pc)
  80 {
  81         memset(pc, 0, sizeof(*pc));
  82 }
  83 EXPORT_SYMBOL_GPL(ide_init_pc);
  84
  85 /*
  86  * Add a special packet command request to the tail of the request queue,
  87  * and wait for it to be serviced.
  88  */
  89 int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
  90                       struct ide_atapi_pc *pc, void *buf, unsigned int bufflen)
  91 {
  92         struct request *rq;
  93         int error;
  94
  95         rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, 0);
  96         ide_req(rq)->type = ATA_PRIV_MISC;
  97         ide_req(rq)->special = pc;
  98
  99         if (buf && bufflen) {
 100                 error = blk_rq_map_kern(drive->queue, rq, buf, bufflen,
 101                                         GFP_NOIO);
 102                 if (error)
 103                         goto put_req;
 104         }
 105
 106         memcpy(scsi_req(rq)->cmd, pc->c, 12);
 107         if (drive->media == ide_tape)
 108                 scsi_req(rq)->cmd[13] = REQ_IDETAPE_PC1;
 109         blk_execute_rq(drive->queue, disk, rq, 0);
 110         error = scsi_req(rq)->result ? -EIO : 0;
 111 put_req:
 112         blk_put_request(rq);
 113         return error;
 114 }
 115 EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
 116
 117 int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
 118 {
 119         struct ide_atapi_pc pc;
 120
 121         ide_init_pc(&pc);
 122         pc.c[0] = TEST_UNIT_READY;
 123
 124         return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
 125 }
 126 EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
 127
 128 int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
 129 {
 130         struct ide_atapi_pc pc;
 131
 132         ide_init_pc(&pc);
 133         pc.c[0] = START_STOP;
 134         pc.c[4] = start;
 135
 136         if (drive->media == ide_tape)
 137                 pc.flags |= PC_FLAG_WAIT_FOR_DSC;
 138
 139         return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
 140 }
 141 EXPORT_SYMBOL_GPL(ide_do_start_stop);
 142
 143 int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
 144 {
 145         struct ide_atapi_pc pc;
 146
 147         if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
 148                 return 0;
 149
 150         ide_init_pc(&pc);
 151         pc.c[0] = ALLOW_MEDIUM_REMOVAL;
 152         pc.c[4] = on;
 153
 154         return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
 155 }
 156 EXPORT_SYMBOL_GPL(ide_set_media_lock);
 157
 158 void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc)
 159 {
 160         ide_init_pc(pc);
 161         pc->c[0] = REQUEST_SENSE;
 162         if (drive->media == ide_floppy) {
 163                 pc->c[4] = 255;
 164                 pc->req_xfer = 18;
 165         } else {
 166                 pc->c[4] = 20;
 167                 pc->req_xfer = 20;
 168         }
 169 }
 170 EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
 171
 172 void ide_prep_sense(ide_drive_t *drive, struct request *rq)
 173 {
 174         struct request_sense *sense = &drive->sense_data;
 175         struct request *sense_rq;
 176         struct scsi_request *req;
 177         unsigned int cmd_len, sense_len;
 178         int err;
 179
 180         switch (drive->media) {
 181         case ide_floppy:
 182                 cmd_len = 255;
 183                 sense_len = 18;
 184                 break;
 185         case ide_tape:
 186                 cmd_len = 20;
 187                 sense_len = 20;
 188                 break;
 189         default:
 190                 cmd_len = 18;
 191                 sense_len = 18;
 192         }
 193
 194         BUG_ON(sense_len > sizeof(*sense));
 195
 196         if (ata_sense_request(rq) || drive->sense_rq_armed)
 197                 return;
 198
 199         sense_rq = drive->sense_rq;
 200         if (!sense_rq) {
 201                 sense_rq = blk_mq_alloc_request(drive->queue, REQ_OP_DRV_IN,
 202                                         BLK_MQ_REQ_RESERVED | BLK_MQ_REQ_NOWAIT);
 203                 drive->sense_rq = sense_rq;
 204         }
 205         req = scsi_req(sense_rq);
 206
 207         memset(sense, 0, sizeof(*sense));
 208
 209         scsi_req_init(req);
 210
 211         err = blk_rq_map_kern(drive->queue, sense_rq, sense, sense_len,
 212                               GFP_NOIO);
 213         if (unlikely(err)) {
 214                 if (printk_ratelimit())
 215                         printk(KERN_WARNING PFX "%s: failed to map sense "
 216                                             "buffer\n", drive->name);
 217                 blk_mq_free_request(sense_rq);
 218                 drive->sense_rq = NULL;
 219                 return;
 220         }
 221
 222         sense_rq->rq_disk = rq->rq_disk;
 223         sense_rq->cmd_flags = REQ_OP_DRV_IN;
 224         ide_req(sense_rq)->type = ATA_PRIV_SENSE;
 225         sense_rq->rq_flags |= RQF_PREEMPT;
 226
 227         req->cmd[0] = GPCMD_REQUEST_SENSE;
 228         req->cmd[4] = cmd_len;
 229         if (drive->media == ide_tape)
 230                 req->cmd[13] = REQ_IDETAPE_PC1;
 231
 232         drive->sense_rq_armed = true;
 233 }
 234 EXPORT_SYMBOL_GPL(ide_prep_sense);
 235
 236 int ide_queue_sense_rq(ide_drive_t *drive, void *special)
 237 {
 238         struct request *sense_rq = drive->sense_rq;
 239
 240         /* deferred failure from ide_prep_sense() */
 241         if (!drive->sense_rq_armed) {
 242                 printk(KERN_WARNING PFX "%s: error queuing a sense request\n",
 243                        drive->name);
 244                 return -ENOMEM;
 245         }
 246
 247         ide_req(sense_rq)->special = special;
 248         drive->sense_rq_armed = false;
 249
 250         drive->hwif->rq = NULL;
 251
 252         ide_insert_request_head(drive, sense_rq);
 253         return 0;
 254 }
 255 EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
 256
 257 /*
 258  * Called when an error was detected during the last packet command.
 259  * We queue a request sense packet command at the head of the request
 260  * queue.
 261  */
 262 void ide_retry_pc(ide_drive_t *drive)
 263 {
 264         struct request *failed_rq = drive->hwif->rq;
 265         struct request *sense_rq = drive->sense_rq;
 266         struct ide_atapi_pc *pc = &drive->request_sense_pc;
 267
 268         (void)ide_read_error(drive);
 269
 270         /* init pc from sense_rq */
 271         ide_init_pc(pc);
 272         memcpy(pc->c, scsi_req(sense_rq)->cmd, 12);
 273
 274         if (drive->media == ide_tape)
 275                 drive->atapi_flags |= IDE_AFLAG_IGNORE_DSC;
 276
 277         /*
 278          * Push back the failed request and put request sense on top
 279          * of it.  The failed command will be retried after sense data
 280          * is acquired.
 281          */
 282         drive->hwif->rq = NULL;
 283         ide_requeue_and_plug(drive, failed_rq);
 284         if (ide_queue_sense_rq(drive, pc))
 285                 ide_complete_rq(drive, BLK_STS_IOERR, blk_rq_bytes(failed_rq));
 286 }
 287 EXPORT_SYMBOL_GPL(ide_retry_pc);
 288
 289 int ide_cd_expiry(ide_drive_t *drive)
 290 {
 291         struct request *rq = drive->hwif->rq;
 292         unsigned long wait = 0;
 293
 294         debug_log("%s: scsi_req(rq)->cmd[0]: 0x%x\n", __func__, scsi_req(rq)->cmd[0]);
 295
 296         /*
 297          * Some commands are *slow* and normally take a long time to complete.
 298          * Usually we can use the ATAPI "disconnect" to bypass this, but not all
 299          * commands/drives support that. Let ide_timer_expiry keep polling us
 300          * for these.
 301          */
 302         switch (scsi_req(rq)->cmd[0]) {
 303         case GPCMD_BLANK:
 304         case GPCMD_FORMAT_UNIT:
 305         case GPCMD_RESERVE_RZONE_TRACK:
 306         case GPCMD_CLOSE_TRACK:
 307         case GPCMD_FLUSH_CACHE:
 308                 wait = ATAPI_WAIT_PC;
 309                 break;
 310         default:
 311                 if (!(rq->rq_flags & RQF_QUIET))
 312                         printk(KERN_INFO PFX "cmd 0x%x timed out\n",
 313                                          scsi_req(rq)->cmd[0]);
 314                 wait = 0;
 315                 break;
 316         }
 317         return wait;
 318 }
 319 EXPORT_SYMBOL_GPL(ide_cd_expiry);
 320
 321 int ide_cd_get_xferlen(struct request *rq)
 322 {
 323         switch (req_op(rq)) {
 324         default:
 325                 return 32768;
 326         case REQ_OP_SCSI_IN:
 327         case REQ_OP_SCSI_OUT:
 328                 return blk_rq_bytes(rq);
 329         case REQ_OP_DRV_IN:
 330         case REQ_OP_DRV_OUT:
 331                 switch (ide_req(rq)->type) {
 332                 case ATA_PRIV_PC:
 333                 case ATA_PRIV_SENSE:
 334                         return blk_rq_bytes(rq);
 335                 default:
 336                         return 0;
 337                 }
 338         }
 339 }
 340 EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
 341
 342 void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
 343 {
 344         struct ide_taskfile tf;
 345
 346         drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT |
 347                                      IDE_VALID_LBAM | IDE_VALID_LBAH);
 348
 349         *bcount = (tf.lbah << 8) | tf.lbam;
 350         *ireason = tf.nsect & 3;
 351 }
 352 EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
 353
 354 /*
 355  * Check the contents of the interrupt reason register and attempt to recover if
 356  * there are problems.
 357  *
 358  * Returns:
 359  * - 0 if everything's ok
 360  * - 1 if the request has to be terminated.
 361  */
 362 int ide_check_ireason(ide_drive_t *drive, struct request *rq, int len,
 363                       int ireason, int rw)
 364 {
 365         ide_hwif_t *hwif = drive->hwif;
 366
 367         debug_log("ireason: 0x%x, rw: 0x%x\n", ireason, rw);
 368
 369         if (ireason == (!rw << 1))
 370                 return 0;
 371         else if (ireason == (rw << 1)) {
 372                 printk(KERN_ERR PFX "%s: %s: wrong transfer direction!\n",
 373                                 drive->name, __func__);
 374
 375                 if (dev_is_idecd(drive))
 376                         ide_pad_transfer(drive, rw, len);
 377         } else if (!rw && ireason == ATAPI_COD) {
 378                 if (dev_is_idecd(drive)) {
 379                         /*
 380                          * Some drives (ASUS) seem to tell us that status info
 381                          * is available.  Just get it and ignore.
 382                          */
 383                         (void)hwif->tp_ops->read_status(hwif);
 384                         return 0;
 385                 }
 386         } else {
 387                 if (ireason & ATAPI_COD)
 388                         printk(KERN_ERR PFX "%s: CoD != 0 in %s\n", drive->name,
 389                                         __func__);
 390
 391                 /* drive wants a command packet, or invalid ireason... */
 392                 printk(KERN_ERR PFX "%s: %s: bad interrupt reason 0x%02x\n",
 393                                 drive->name, __func__, ireason);
 394         }
 395
 396         if (dev_is_idecd(drive) && ata_pc_request(rq))
 397                 rq->rq_flags |= RQF_FAILED;
 398
 399         return 1;
 400 }
 401 EXPORT_SYMBOL_GPL(ide_check_ireason);
 402
 403 /*
 404  * This is the usual interrupt handler which will be called during a packet
 405  * command.  We will transfer some of the data (as requested by the drive)
 406  * and will re-point interrupt handler to us.
 407  */
 408 static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 409 {
 410         struct ide_atapi_pc *pc = drive->pc;
 411         ide_hwif_t *hwif = drive->hwif;
 412         struct ide_cmd *cmd = &hwif->cmd;
 413         struct request *rq = hwif->rq;
 414         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 415         unsigned int timeout, done;
 416         u16 bcount;
 417         u8 stat, ireason, dsc = 0;
 418         u8 write = !!(pc->flags & PC_FLAG_WRITING);
 419
 420         debug_log("Enter %s - interrupt handler\n", __func__);
 421
 422         timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
 423                                                : WAIT_TAPE_CMD;
 424
 425         /* Clear the interrupt */
 426         stat = tp_ops->read_status(hwif);
 427
 428         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 429                 int rc;
 430
 431                 drive->waiting_for_dma = 0;
 432                 rc = hwif->dma_ops->dma_end(drive);
 433                 ide_dma_unmap_sg(drive, cmd);
 434
 435                 if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
 436                         if (drive->media == ide_floppy)
 437                                 printk(KERN_ERR PFX "%s: DMA %s error\n",
 438                                         drive->name, rq_data_dir(pc->rq)
 439                                                      ? "write" : "read");
 440                         pc->flags |= PC_FLAG_DMA_ERROR;
 441                 } else
 442                         scsi_req(rq)->resid_len = 0;
 443                 debug_log("%s: DMA finished\n", drive->name);
 444         }
 445
 446         /* No more interrupts */
 447         if ((stat & ATA_DRQ) == 0) {
 448                 int uptodate;
 449                 blk_status_t error;
 450
 451                 debug_log("Packet command completed, %d bytes transferred\n",
 452                           blk_rq_bytes(rq));
 453
 454                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 455
 456                 local_irq_enable_in_hardirq();
 457
 458                 if (drive->media == ide_tape &&
 459                     (stat & ATA_ERR) && scsi_req(rq)->cmd[0] == REQUEST_SENSE)
 460                         stat &= ~ATA_ERR;
 461
 462                 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
 463                         /* Error detected */
 464                         debug_log("%s: I/O error\n", drive->name);
 465
 466                         if (drive->media != ide_tape)
 467                                 scsi_req(pc->rq)->result++;
 468
 469                         if (scsi_req(rq)->cmd[0] == REQUEST_SENSE) {
 470                                 printk(KERN_ERR PFX "%s: I/O error in request "
 471                                                 "sense command\n", drive->name);
 472                                 return ide_do_reset(drive);
 473                         }
 474
 475                         debug_log("[cmd %x]: check condition\n", scsi_req(rq)->cmd[0]);
 476
 477                         /* Retry operation */
 478                         ide_retry_pc(drive);
 479
 480                         /* queued, but not started */
 481                         return ide_stopped;
 482                 }
 483                 pc->error = 0;
 484
 485                 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
 486                         dsc = 1;
 487
 488                 /*
 489                  * ->pc_callback() might change rq->data_len for
 490                  * residual count, cache total length.
 491                  */
 492                 done = blk_rq_bytes(rq);
 493
 494                 /* Command finished - Call the callback function */
 495                 uptodate = drive->pc_callback(drive, dsc);
 496
 497                 if (uptodate == 0)
 498                         drive->failed_pc = NULL;
 499
 500                 if (ata_misc_request(rq)) {
 501                         scsi_req(rq)->result = 0;
 502                         error = BLK_STS_OK;
 503                 } else {
 504
 505                         if (blk_rq_is_passthrough(rq) && uptodate <= 0) {
 506                                 if (scsi_req(rq)->result == 0)
 507                                         scsi_req(rq)->result = -EIO;
 508                         }
 509
 510                         error = uptodate ? BLK_STS_OK : BLK_STS_IOERR;
 511                 }
 512
 513                 ide_complete_rq(drive, error, blk_rq_bytes(rq));
 514                 return ide_stopped;
 515         }
 516
 517         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 518                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 519                 printk(KERN_ERR PFX "%s: The device wants to issue more "
 520                                 "interrupts in DMA mode\n", drive->name);
 521                 ide_dma_off(drive);
 522                 return ide_do_reset(drive);
 523         }
 524
 525         /* Get the number of bytes to transfer on this interrupt. */
 526         ide_read_bcount_and_ireason(drive, &bcount, &ireason);
 527
 528         if (ide_check_ireason(drive, rq, bcount, ireason, write))
 529                 return ide_do_reset(drive);
 530
 531         done = min_t(unsigned int, bcount, cmd->nleft);
 532         ide_pio_bytes(drive, cmd, write, done);
 533
 534         /* Update transferred byte count */
 535         scsi_req(rq)->resid_len -= done;
 536
 537         bcount -= done;
 538
 539         if (bcount)
 540                 ide_pad_transfer(drive, write, bcount);
 541
 542         debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n",
 543                   scsi_req(rq)->cmd[0], done, bcount, scsi_req(rq)->resid_len);
 544
 545         /* And set the interrupt handler again */
 546         ide_set_handler(drive, ide_pc_intr, timeout);
 547         return ide_started;
 548 }
 549
 550 static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf,
 551                                 u16 bcount, u8 dma)
 552 {
 553         cmd->protocol = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO;
 554         cmd->valid.out.tf = IDE_VALID_LBAH | IDE_VALID_LBAM |
 555                             IDE_VALID_FEATURE | valid_tf;
 556         cmd->tf.command = ATA_CMD_PACKET;
 557         cmd->tf.feature = dma;          /* Use PIO/DMA */
 558         cmd->tf.lbam    = bcount & 0xff;
 559         cmd->tf.lbah    = (bcount >> 8) & 0xff;
 560 }
 561
 562 static u8 ide_read_ireason(ide_drive_t *drive)
 563 {
 564         struct ide_taskfile tf;
 565
 566         drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT);
 567
 568         return tf.nsect & 3;
 569 }
 570
 571 static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
 572 {
 573         int retries = 100;
 574
 575         while (retries-- && ((ireason & ATAPI_COD) == 0 ||
 576                 (ireason & ATAPI_IO))) {
 577                 printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing "
 578                                 "a packet command, retrying\n", drive->name);
 579                 udelay(100);
 580                 ireason = ide_read_ireason(drive);
 581                 if (retries == 0) {
 582                         printk(KERN_ERR PFX "%s: (IO,CoD != (0,1) while issuing"
 583                                         " a packet command, ignoring\n",
 584                                         drive->name);
 585                         ireason |= ATAPI_COD;
 586                         ireason &= ~ATAPI_IO;
 587                 }
 588         }
 589
 590         return ireason;
 591 }
 592
 593 static int ide_delayed_transfer_pc(ide_drive_t *drive)
 594 {
 595         /* Send the actual packet */
 596         drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
 597
 598         /* Timeout for the packet command */
 599         return WAIT_FLOPPY_CMD;
 600 }
 601
 602 static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
 603 {
 604         struct ide_atapi_pc *uninitialized_var(pc);
 605         ide_hwif_t *hwif = drive->hwif;
 606         struct request *rq = hwif->rq;
 607         ide_expiry_t *expiry;
 608         unsigned int timeout;
 609         int cmd_len;
 610         ide_startstop_t startstop;
 611         u8 ireason;
 612
 613         if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
 614                 printk(KERN_ERR PFX "%s: Strange, packet command initiated yet "
 615                                 "DRQ isn't asserted\n", drive->name);
 616                 return startstop;
 617         }
 618
 619         if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
 620                 if (drive->dma)
 621                         drive->waiting_for_dma = 1;
 622         }
 623
 624         if (dev_is_idecd(drive)) {
 625                 /* ATAPI commands get padded out to 12 bytes minimum */
 626                 cmd_len = COMMAND_SIZE(scsi_req(rq)->cmd[0]);
 627                 if (cmd_len < ATAPI_MIN_CDB_BYTES)
 628                         cmd_len = ATAPI_MIN_CDB_BYTES;
 629
 630                 timeout = rq->timeout;
 631                 expiry  = ide_cd_expiry;
 632         } else {
 633                 pc = drive->pc;
 634
 635                 cmd_len = ATAPI_MIN_CDB_BYTES;
 636
 637                 /*
 638                  * If necessary schedule the packet transfer to occur 'timeout'
 639                  * milliseconds later in ide_delayed_transfer_pc() after the
 640                  * device says it's ready for a packet.
 641                  */
 642                 if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
 643                         timeout = drive->pc_delay;
 644                         expiry = &ide_delayed_transfer_pc;
 645                 } else {
 646                         timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
 647                                                                : WAIT_TAPE_CMD;
 648                         expiry = NULL;
 649                 }
 650
 651                 ireason = ide_read_ireason(drive);
 652                 if (drive->media == ide_tape)
 653                         ireason = ide_wait_ireason(drive, ireason);
 654
 655                 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
 656                         printk(KERN_ERR PFX "%s: (IO,CoD) != (0,1) while "
 657                                 "issuing a packet command\n", drive->name);
 658
 659                         return ide_do_reset(drive);
 660                 }
 661         }
 662
 663         hwif->expiry = expiry;
 664
 665         /* Set the interrupt routine */
 666         ide_set_handler(drive,
 667                         (dev_is_idecd(drive) ? drive->irq_handler
 668                                              : ide_pc_intr),
 669                         timeout);
 670
 671         /* Send the actual packet */
 672         if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
 673                 hwif->tp_ops->output_data(drive, NULL, scsi_req(rq)->cmd, cmd_len);
 674
 675         /* Begin DMA, if necessary */
 676         if (dev_is_idecd(drive)) {
 677                 if (drive->dma)
 678                         hwif->dma_ops->dma_start(drive);
 679         } else {
 680                 if (pc->flags & PC_FLAG_DMA_OK) {
 681                         pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
 682                         hwif->dma_ops->dma_start(drive);
 683                 }
 684         }
 685
 686         return ide_started;
 687 }
 688
 689 ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
 690 {
 691         struct ide_atapi_pc *pc;
 692         ide_hwif_t *hwif = drive->hwif;
 693         ide_expiry_t *expiry = NULL;
 694         struct request *rq = hwif->rq;
 695         unsigned int timeout, bytes;
 696         u16 bcount;
 697         u8 valid_tf;
 698         u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
 699
 700         if (dev_is_idecd(drive)) {
 701                 valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL;
 702                 bcount = ide_cd_get_xferlen(rq);
 703                 expiry = ide_cd_expiry;
 704                 timeout = ATAPI_WAIT_PC;
 705
 706                 if (drive->dma)
 707                         drive->dma = !ide_dma_prepare(drive, cmd);
 708         } else {
 709                 pc = drive->pc;
 710
 711                 valid_tf = IDE_VALID_DEVICE;
 712                 bytes = blk_rq_bytes(rq);
 713                 bcount = ((drive->media == ide_tape) ? bytes
 714                                                      : min_t(unsigned int,
 715                                                              bytes, 63 * 1024));
 716
 717                 /* We haven't transferred any data yet */
 718                 scsi_req(rq)->resid_len = bcount;
 719
 720                 if (pc->flags & PC_FLAG_DMA_ERROR) {
 721                         pc->flags &= ~PC_FLAG_DMA_ERROR;
 722                         ide_dma_off(drive);
 723                 }
 724
 725                 if (pc->flags & PC_FLAG_DMA_OK)
 726                         drive->dma = !ide_dma_prepare(drive, cmd);
 727
 728                 if (!drive->dma)
 729                         pc->flags &= ~PC_FLAG_DMA_OK;
 730
 731                 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
 732                                                        : WAIT_TAPE_CMD;
 733         }
 734
 735         ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma);
 736
 737         (void)do_rw_taskfile(drive, cmd);
 738
 739         if (drq_int) {
 740                 if (drive->dma)
 741                         drive->waiting_for_dma = 0;
 742                 hwif->expiry = expiry;
 743         }
 744
 745         ide_execute_command(drive, cmd, ide_transfer_pc, timeout);
 746
 747         return drq_int ? ide_started : ide_transfer_pc(drive);
 748 }
 749 EXPORT_SYMBOL_GPL(ide_issue_pc);