SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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/ide.h>
   9 #include <linux/scatterlist.h>
  10
  11 #include <scsi/scsi.h>
  12
  13 #ifdef DEBUG
  14 #define debug_log(fmt, args...) \
  15         printk(KERN_INFO "ide: " fmt, ## args)
  16 #else
  17 #define debug_log(fmt, args...) do {} while (0)
  18 #endif
  19
  20 #define ATAPI_MIN_CDB_BYTES     12
  21
  22 static inline int dev_is_idecd(ide_drive_t *drive)
  23 {
  24         return drive->media == ide_cdrom || drive->media == ide_optical;
  25 }
  26
  27 /*
  28  * Check whether we can support a device,
  29  * based on the ATAPI IDENTIFY command results.
  30  */
  31 int ide_check_atapi_device(ide_drive_t *drive, const char *s)
  32 {
  33         u16 *id = drive->id;
  34         u8 gcw[2], protocol, device_type, removable, drq_type, packet_size;
  35
  36         *((u16 *)&gcw) = id[ATA_ID_CONFIG];
  37
  38         protocol    = (gcw[1] & 0xC0) >> 6;
  39         device_type =  gcw[1] & 0x1F;
  40         removable   = (gcw[0] & 0x80) >> 7;
  41         drq_type    = (gcw[0] & 0x60) >> 5;
  42         packet_size =  gcw[0] & 0x03;
  43
  44 #ifdef CONFIG_PPC
  45         /* kludge for Apple PowerBook internal zip */
  46         if (drive->media == ide_floppy && device_type == 5 &&
  47             !strstr((char *)&id[ATA_ID_PROD], "CD-ROM") &&
  48             strstr((char *)&id[ATA_ID_PROD], "ZIP"))
  49                 device_type = 0;
  50 #endif
  51
  52         if (protocol != 2)
  53                 printk(KERN_ERR "%s: %s: protocol (0x%02x) is not ATAPI\n",
  54                         s, drive->name, protocol);
  55         else if ((drive->media == ide_floppy && device_type != 0) ||
  56                  (drive->media == ide_tape && device_type != 1))
  57                 printk(KERN_ERR "%s: %s: invalid device type (0x%02x)\n",
  58                         s, drive->name, device_type);
  59         else if (removable == 0)
  60                 printk(KERN_ERR "%s: %s: the removable flag is not set\n",
  61                         s, drive->name);
  62         else if (drive->media == ide_floppy && drq_type == 3)
  63                 printk(KERN_ERR "%s: %s: sorry, DRQ type (0x%02x) not "
  64                         "supported\n", s, drive->name, drq_type);
  65         else if (packet_size != 0)
  66                 printk(KERN_ERR "%s: %s: packet size (0x%02x) is not 12 "
  67                         "bytes\n", s, drive->name, packet_size);
  68         else
  69                 return 1;
  70         return 0;
  71 }
  72 EXPORT_SYMBOL_GPL(ide_check_atapi_device);
  73
  74 void ide_init_pc(struct ide_atapi_pc *pc)
  75 {
  76         memset(pc, 0, sizeof(*pc));
  77         pc->buf = pc->pc_buf;
  78         pc->buf_size = IDE_PC_BUFFER_SIZE;
  79 }
  80 EXPORT_SYMBOL_GPL(ide_init_pc);
  81
  82 /*
  83  * Generate a new packet command request in front of the request queue, before
  84  * the current request, so that it will be processed immediately, on the next
  85  * pass through the driver.
  86  */
  87 static void ide_queue_pc_head(ide_drive_t *drive, struct gendisk *disk,
  88                               struct ide_atapi_pc *pc, struct request *rq)
  89 {
  90         blk_rq_init(NULL, rq);
  91         rq->cmd_type = REQ_TYPE_SPECIAL;
  92         rq->cmd_flags |= REQ_PREEMPT;
  93         rq->special = (char *)pc;
  94         rq->rq_disk = disk;
  95
  96         if (pc->req_xfer) {
  97                 rq->data = pc->buf;
  98                 rq->data_len = pc->req_xfer;
  99         }
 100
 101         memcpy(rq->cmd, pc->c, 12);
 102         if (drive->media == ide_tape)
 103                 rq->cmd[13] = REQ_IDETAPE_PC1;
 104
 105         drive->hwif->rq = NULL;
 106
 107         elv_add_request(drive->queue, rq, ELEVATOR_INSERT_FRONT, 0);
 108 }
 109
 110 /*
 111  * Add a special packet command request to the tail of the request queue,
 112  * and wait for it to be serviced.
 113  */
 114 int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
 115                       struct ide_atapi_pc *pc)
 116 {
 117         struct request *rq;
 118         int error;
 119
 120         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
 121         rq->cmd_type = REQ_TYPE_SPECIAL;
 122         rq->special = (char *)pc;
 123
 124         if (pc->req_xfer) {
 125                 rq->data = pc->buf;
 126                 rq->data_len = pc->req_xfer;
 127         }
 128
 129         memcpy(rq->cmd, pc->c, 12);
 130         if (drive->media == ide_tape)
 131                 rq->cmd[13] = REQ_IDETAPE_PC1;
 132         error = blk_execute_rq(drive->queue, disk, rq, 0);
 133         blk_put_request(rq);
 134
 135         return error;
 136 }
 137 EXPORT_SYMBOL_GPL(ide_queue_pc_tail);
 138
 139 int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
 140 {
 141         struct ide_atapi_pc pc;
 142
 143         ide_init_pc(&pc);
 144         pc.c[0] = TEST_UNIT_READY;
 145
 146         return ide_queue_pc_tail(drive, disk, &pc);
 147 }
 148 EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);
 149
 150 int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
 151 {
 152         struct ide_atapi_pc pc;
 153
 154         ide_init_pc(&pc);
 155         pc.c[0] = START_STOP;
 156         pc.c[4] = start;
 157
 158         if (drive->media == ide_tape)
 159                 pc.flags |= PC_FLAG_WAIT_FOR_DSC;
 160
 161         return ide_queue_pc_tail(drive, disk, &pc);
 162 }
 163 EXPORT_SYMBOL_GPL(ide_do_start_stop);
 164
 165 int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
 166 {
 167         struct ide_atapi_pc pc;
 168
 169         if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0)
 170                 return 0;
 171
 172         ide_init_pc(&pc);
 173         pc.c[0] = ALLOW_MEDIUM_REMOVAL;
 174         pc.c[4] = on;
 175
 176         return ide_queue_pc_tail(drive, disk, &pc);
 177 }
 178 EXPORT_SYMBOL_GPL(ide_set_media_lock);
 179
 180 void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc)
 181 {
 182         ide_init_pc(pc);
 183         pc->c[0] = REQUEST_SENSE;
 184         if (drive->media == ide_floppy) {
 185                 pc->c[4] = 255;
 186                 pc->req_xfer = 18;
 187         } else {
 188                 pc->c[4] = 20;
 189                 pc->req_xfer = 20;
 190         }
 191 }
 192 EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd);
 193
 194 void ide_prep_sense(ide_drive_t *drive, struct request *rq)
 195 {
 196         struct request_sense *sense = &drive->sense_data;
 197         struct request *sense_rq = &drive->sense_rq;
 198         unsigned int cmd_len, sense_len;
 199
 200         debug_log("%s: enter\n", __func__);
 201
 202         switch (drive->media) {
 203         case ide_floppy:
 204                 cmd_len = 255;
 205                 sense_len = 18;
 206                 break;
 207         case ide_tape:
 208                 cmd_len = 20;
 209                 sense_len = 20;
 210                 break;
 211         default:
 212                 cmd_len = 18;
 213                 sense_len = 18;
 214         }
 215
 216         BUG_ON(sense_len > sizeof(*sense));
 217
 218         if (blk_sense_request(rq) || drive->sense_rq_armed)
 219                 return;
 220
 221         memset(sense, 0, sizeof(*sense));
 222
 223         blk_rq_init(rq->q, sense_rq);
 224         sense_rq->rq_disk = rq->rq_disk;
 225
 226         sense_rq->data = sense;
 227         sense_rq->cmd[0] = GPCMD_REQUEST_SENSE;
 228         sense_rq->cmd[4] = cmd_len;
 229         sense_rq->data_len = sense_len;
 230
 231         sense_rq->cmd_type = REQ_TYPE_SENSE;
 232         sense_rq->cmd_flags |= REQ_PREEMPT;
 233
 234         if (drive->media == ide_tape)
 235                 sense_rq->cmd[13] = REQ_IDETAPE_PC1;
 236
 237         drive->sense_rq_armed = true;
 238 }
 239 EXPORT_SYMBOL_GPL(ide_prep_sense);
 240
 241 void ide_queue_sense_rq(ide_drive_t *drive, void *special)
 242 {
 243         BUG_ON(!drive->sense_rq_armed);
 244
 245         drive->sense_rq.special = special;
 246         drive->sense_rq_armed = false;
 247
 248         drive->hwif->rq = NULL;
 249
 250         elv_add_request(drive->queue, &drive->sense_rq,
 251                         ELEVATOR_INSERT_FRONT, 0);
 252 }
 253 EXPORT_SYMBOL_GPL(ide_queue_sense_rq);
 254
 255 /*
 256  * Called when an error was detected during the last packet command.
 257  * We queue a request sense packet command in the head of the request list.
 258  */
 259 void ide_retry_pc(ide_drive_t *drive, struct gendisk *disk)
 260 {
 261         struct request *rq = &drive->request_sense_rq;
 262         struct ide_atapi_pc *pc = &drive->request_sense_pc;
 263
 264         (void)ide_read_error(drive);
 265         ide_create_request_sense_cmd(drive, pc);
 266         if (drive->media == ide_tape)
 267                 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags);
 268         ide_queue_pc_head(drive, disk, pc, rq);
 269 }
 270 EXPORT_SYMBOL_GPL(ide_retry_pc);
 271
 272 int ide_cd_expiry(ide_drive_t *drive)
 273 {
 274         struct request *rq = drive->hwif->rq;
 275         unsigned long wait = 0;
 276
 277         debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]);
 278
 279         /*
 280          * Some commands are *slow* and normally take a long time to complete.
 281          * Usually we can use the ATAPI "disconnect" to bypass this, but not all
 282          * commands/drives support that. Let ide_timer_expiry keep polling us
 283          * for these.
 284          */
 285         switch (rq->cmd[0]) {
 286         case GPCMD_BLANK:
 287         case GPCMD_FORMAT_UNIT:
 288         case GPCMD_RESERVE_RZONE_TRACK:
 289         case GPCMD_CLOSE_TRACK:
 290         case GPCMD_FLUSH_CACHE:
 291                 wait = ATAPI_WAIT_PC;
 292                 break;
 293         default:
 294                 if (!(rq->cmd_flags & REQ_QUIET))
 295                         printk(KERN_INFO "cmd 0x%x timed out\n",
 296                                          rq->cmd[0]);
 297                 wait = 0;
 298                 break;
 299         }
 300         return wait;
 301 }
 302 EXPORT_SYMBOL_GPL(ide_cd_expiry);
 303
 304 int ide_cd_get_xferlen(struct request *rq)
 305 {
 306         if (blk_fs_request(rq))
 307                 return 32768;
 308         else if (blk_sense_request(rq) || blk_pc_request(rq) ||
 309                          rq->cmd_type == REQ_TYPE_ATA_PC)
 310                 return rq->data_len;
 311         else
 312                 return 0;
 313 }
 314 EXPORT_SYMBOL_GPL(ide_cd_get_xferlen);
 315
 316 void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason)
 317 {
 318         struct ide_taskfile tf;
 319
 320         drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT |
 321                                      IDE_VALID_LBAM | IDE_VALID_LBAH);
 322
 323         *bcount = (tf.lbah << 8) | tf.lbam;
 324         *ireason = tf.nsect & 3;
 325 }
 326 EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason);
 327
 328 /*
 329  * This is the usual interrupt handler which will be called during a packet
 330  * command.  We will transfer some of the data (as requested by the drive)
 331  * and will re-point interrupt handler to us.
 332  */
 333 static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
 334 {
 335         struct ide_atapi_pc *pc = drive->pc;
 336         ide_hwif_t *hwif = drive->hwif;
 337         struct ide_cmd *cmd = &hwif->cmd;
 338         struct request *rq = hwif->rq;
 339         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 340         xfer_func_t *xferfunc;
 341         unsigned int timeout, done;
 342         u16 bcount;
 343         u8 stat, ireason, dsc = 0;
 344         u8 write = !!(pc->flags & PC_FLAG_WRITING);
 345
 346         debug_log("Enter %s - interrupt handler\n", __func__);
 347
 348         timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
 349                                                : WAIT_TAPE_CMD;
 350
 351         /* Clear the interrupt */
 352         stat = tp_ops->read_status(hwif);
 353
 354         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 355                 int rc;
 356
 357                 drive->waiting_for_dma = 0;
 358                 rc = hwif->dma_ops->dma_end(drive);
 359                 ide_dma_unmap_sg(drive, cmd);
 360
 361                 if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) {
 362                         if (drive->media == ide_floppy)
 363                                 printk(KERN_ERR "%s: DMA %s error\n",
 364                                         drive->name, rq_data_dir(pc->rq)
 365                                                      ? "write" : "read");
 366                         pc->flags |= PC_FLAG_DMA_ERROR;
 367                 } else {
 368                         pc->xferred = pc->req_xfer;
 369                         if (drive->pc_update_buffers)
 370                                 drive->pc_update_buffers(drive, pc);
 371                 }
 372                 debug_log("%s: DMA finished\n", drive->name);
 373         }
 374
 375         /* No more interrupts */
 376         if ((stat & ATA_DRQ) == 0) {
 377                 int uptodate, error;
 378                 unsigned int done;
 379
 380                 debug_log("Packet command completed, %d bytes transferred\n",
 381                           pc->xferred);
 382
 383                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 384
 385                 local_irq_enable_in_hardirq();
 386
 387                 if (drive->media == ide_tape &&
 388                     (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE)
 389                         stat &= ~ATA_ERR;
 390
 391                 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) {
 392                         /* Error detected */
 393                         debug_log("%s: I/O error\n", drive->name);
 394
 395                         if (drive->media != ide_tape)
 396                                 pc->rq->errors++;
 397
 398                         if (rq->cmd[0] == REQUEST_SENSE) {
 399                                 printk(KERN_ERR "%s: I/O error in request sense"
 400                                                 " command\n", drive->name);
 401                                 return ide_do_reset(drive);
 402                         }
 403
 404                         debug_log("[cmd %x]: check condition\n", rq->cmd[0]);
 405
 406                         /* Retry operation */
 407                         ide_retry_pc(drive, rq->rq_disk);
 408
 409                         /* queued, but not started */
 410                         return ide_stopped;
 411                 }
 412                 pc->error = 0;
 413
 414                 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0)
 415                         dsc = 1;
 416
 417                 /* Command finished - Call the callback function */
 418                 uptodate = drive->pc_callback(drive, dsc);
 419
 420                 if (uptodate == 0)
 421                         drive->failed_pc = NULL;
 422
 423                 if (blk_special_request(rq)) {
 424                         rq->errors = 0;
 425                         done = blk_rq_bytes(rq);
 426                         error = 0;
 427                 } else {
 428
 429                         if (blk_fs_request(rq) == 0 && uptodate <= 0) {
 430                                 if (rq->errors == 0)
 431                                         rq->errors = -EIO;
 432                         }
 433
 434                         if (drive->media == ide_tape)
 435                                 done = ide_rq_bytes(rq); /* FIXME */
 436                         else
 437                                 done = blk_rq_bytes(rq);
 438
 439                         error = uptodate ? 0 : -EIO;
 440                 }
 441
 442                 ide_complete_rq(drive, error, done);
 443                 return ide_stopped;
 444         }
 445
 446         if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
 447                 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 448                 printk(KERN_ERR "%s: The device wants to issue more interrupts "
 449                                 "in DMA mode\n", drive->name);
 450                 ide_dma_off(drive);
 451                 return ide_do_reset(drive);
 452         }
 453
 454         /* Get the number of bytes to transfer on this interrupt. */
 455         ide_read_bcount_and_ireason(drive, &bcount, &ireason);
 456
 457         if (ireason & ATAPI_COD) {
 458                 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__);
 459                 return ide_do_reset(drive);
 460         }
 461
 462         if (((ireason & ATAPI_IO) == ATAPI_IO) == write) {
 463                 /* Hopefully, we will never get here */
 464                 printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
 465                                 "to %s!\n", drive->name,
 466                                 (ireason & ATAPI_IO) ? "Write" : "Read",
 467                                 (ireason & ATAPI_IO) ? "Read" : "Write");
 468                 return ide_do_reset(drive);
 469         }
 470
 471         xferfunc = write ? tp_ops->output_data : tp_ops->input_data;
 472
 473         if (drive->media == ide_floppy && pc->buf == NULL) {
 474                 done = min_t(unsigned int, bcount, cmd->nleft);
 475                 ide_pio_bytes(drive, cmd, write, done);
 476         } else if (drive->media == ide_tape && pc->bh) {
 477                 done = drive->pc_io_buffers(drive, pc, bcount, write);
 478         } else {
 479                 done = min_t(unsigned int, bcount, pc->req_xfer - pc->xferred);
 480                 xferfunc(drive, NULL, pc->cur_pos, done);
 481         }
 482
 483         /* Update the current position */
 484         pc->xferred += done;
 485         pc->cur_pos += done;
 486
 487         bcount -= done;
 488
 489         if (bcount)
 490                 ide_pad_transfer(drive, write, bcount);
 491
 492         debug_log("[cmd %x] transferred %d bytes, padded %d bytes\n",
 493                   rq->cmd[0], done, bcount);
 494
 495         /* And set the interrupt handler again */
 496         ide_set_handler(drive, ide_pc_intr, timeout);
 497         return ide_started;
 498 }
 499
 500 static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf,
 501                                 u16 bcount, u8 dma)
 502 {
 503         cmd->protocol = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO;
 504         cmd->valid.out.tf = IDE_VALID_LBAH | IDE_VALID_LBAM |
 505                             IDE_VALID_FEATURE | valid_tf;
 506         cmd->tf.command = ATA_CMD_PACKET;
 507         cmd->tf.feature = dma;          /* Use PIO/DMA */
 508         cmd->tf.lbam    = bcount & 0xff;
 509         cmd->tf.lbah    = (bcount >> 8) & 0xff;
 510 }
 511
 512 static u8 ide_read_ireason(ide_drive_t *drive)
 513 {
 514         struct ide_taskfile tf;
 515
 516         drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT);
 517
 518         return tf.nsect & 3;
 519 }
 520
 521 static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason)
 522 {
 523         int retries = 100;
 524
 525         while (retries-- && ((ireason & ATAPI_COD) == 0 ||
 526                 (ireason & ATAPI_IO))) {
 527                 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
 528                                 "a packet command, retrying\n", drive->name);
 529                 udelay(100);
 530                 ireason = ide_read_ireason(drive);
 531                 if (retries == 0) {
 532                         printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing "
 533                                         "a packet command, ignoring\n",
 534                                         drive->name);
 535                         ireason |= ATAPI_COD;
 536                         ireason &= ~ATAPI_IO;
 537                 }
 538         }
 539
 540         return ireason;
 541 }
 542
 543 static int ide_delayed_transfer_pc(ide_drive_t *drive)
 544 {
 545         /* Send the actual packet */
 546         drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);
 547
 548         /* Timeout for the packet command */
 549         return WAIT_FLOPPY_CMD;
 550 }
 551
 552 static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
 553 {
 554         struct ide_atapi_pc *uninitialized_var(pc);
 555         ide_hwif_t *hwif = drive->hwif;
 556         struct request *rq = hwif->rq;
 557         ide_expiry_t *expiry;
 558         unsigned int timeout;
 559         int cmd_len;
 560         ide_startstop_t startstop;
 561         u8 ireason;
 562
 563         if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
 564                 printk(KERN_ERR "%s: Strange, packet command initiated yet "
 565                                 "DRQ isn't asserted\n", drive->name);
 566                 return startstop;
 567         }
 568
 569         if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
 570                 if (drive->dma)
 571                         drive->waiting_for_dma = 1;
 572         }
 573
 574         if (dev_is_idecd(drive)) {
 575                 /* ATAPI commands get padded out to 12 bytes minimum */
 576                 cmd_len = COMMAND_SIZE(rq->cmd[0]);
 577                 if (cmd_len < ATAPI_MIN_CDB_BYTES)
 578                         cmd_len = ATAPI_MIN_CDB_BYTES;
 579
 580                 timeout = rq->timeout;
 581                 expiry  = ide_cd_expiry;
 582         } else {
 583                 pc = drive->pc;
 584
 585                 cmd_len = ATAPI_MIN_CDB_BYTES;
 586
 587                 /*
 588                  * If necessary schedule the packet transfer to occur 'timeout'
 589                  * miliseconds later in ide_delayed_transfer_pc() after the
 590                  * device says it's ready for a packet.
 591                  */
 592                 if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) {
 593                         timeout = drive->pc_delay;
 594                         expiry = &ide_delayed_transfer_pc;
 595                 } else {
 596                         timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
 597                                                                : WAIT_TAPE_CMD;
 598                         expiry = NULL;
 599                 }
 600
 601                 ireason = ide_read_ireason(drive);
 602                 if (drive->media == ide_tape)
 603                         ireason = ide_wait_ireason(drive, ireason);
 604
 605                 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) {
 606                         printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing "
 607                                         "a packet command\n", drive->name);
 608
 609                         return ide_do_reset(drive);
 610                 }
 611         }
 612
 613         hwif->expiry = expiry;
 614
 615         /* Set the interrupt routine */
 616         ide_set_handler(drive,
 617                         (dev_is_idecd(drive) ? drive->irq_handler
 618                                              : ide_pc_intr),
 619                         timeout);
 620
 621         /* Send the actual packet */
 622         if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
 623                 hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
 624
 625         /* Begin DMA, if necessary */
 626         if (dev_is_idecd(drive)) {
 627                 if (drive->dma)
 628                         hwif->dma_ops->dma_start(drive);
 629         } else {
 630                 if (pc->flags & PC_FLAG_DMA_OK) {
 631                         pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
 632                         hwif->dma_ops->dma_start(drive);
 633                 }
 634         }
 635
 636         return ide_started;
 637 }
 638
 639 ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd)
 640 {
 641         struct ide_atapi_pc *pc;
 642         ide_hwif_t *hwif = drive->hwif;
 643         ide_expiry_t *expiry = NULL;
 644         struct request *rq = hwif->rq;
 645         unsigned int timeout;
 646         u16 bcount;
 647         u8 valid_tf;
 648         u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT);
 649
 650         if (dev_is_idecd(drive)) {
 651                 valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL;
 652                 bcount = ide_cd_get_xferlen(rq);
 653                 expiry = ide_cd_expiry;
 654                 timeout = ATAPI_WAIT_PC;
 655
 656                 if (drive->dma)
 657                         drive->dma = !ide_dma_prepare(drive, cmd);
 658         } else {
 659                 pc = drive->pc;
 660
 661                 /* We haven't transferred any data yet */
 662                 pc->xferred = 0;
 663                 pc->cur_pos = pc->buf;
 664
 665                 valid_tf = IDE_VALID_DEVICE;
 666                 bcount = ((drive->media == ide_tape) ?
 667                                 pc->req_xfer :
 668                                 min(pc->req_xfer, 63 * 1024));
 669
 670                 if (pc->flags & PC_FLAG_DMA_ERROR) {
 671                         pc->flags &= ~PC_FLAG_DMA_ERROR;
 672                         ide_dma_off(drive);
 673                 }
 674
 675                 if (pc->flags & PC_FLAG_DMA_OK)
 676                         drive->dma = !ide_dma_prepare(drive, cmd);
 677
 678                 if (!drive->dma)
 679                         pc->flags &= ~PC_FLAG_DMA_OK;
 680
 681                 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD
 682                                                        : WAIT_TAPE_CMD;
 683         }
 684
 685         ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma);
 686
 687         (void)do_rw_taskfile(drive, cmd);
 688
 689         if (drq_int) {
 690                 if (drive->dma)
 691                         drive->waiting_for_dma = 0;
 692                 hwif->expiry = expiry;
 693         }
 694
 695         ide_execute_command(drive, cmd, ide_transfer_pc, timeout);
 696
 697         return drq_int ? ide_started : ide_transfer_pc(drive);
 698 }
 699 EXPORT_SYMBOL_GPL(ide_issue_pc);