ide-atapi.c revision 068753203e6cd085664a62e0fc0636e19b148a12
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 22static 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 */ 31int 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} 72EXPORT_SYMBOL_GPL(ide_check_atapi_device); 73 74void 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} 80EXPORT_SYMBOL_GPL(ide_init_pc); 81 82/* 83 * Add a special packet command request to the tail of the request queue, 84 * and wait for it to be serviced. 85 */ 86int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk, 87 struct ide_atapi_pc *pc) 88{ 89 struct request *rq; 90 int error; 91 92 rq = blk_get_request(drive->queue, READ, __GFP_WAIT); 93 rq->cmd_type = REQ_TYPE_SPECIAL; 94 rq->special = (char *)pc; 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 error = blk_execute_rq(drive->queue, disk, rq, 0); 105 blk_put_request(rq); 106 107 return error; 108} 109EXPORT_SYMBOL_GPL(ide_queue_pc_tail); 110 111int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk) 112{ 113 struct ide_atapi_pc pc; 114 115 ide_init_pc(&pc); 116 pc.c[0] = TEST_UNIT_READY; 117 118 return ide_queue_pc_tail(drive, disk, &pc); 119} 120EXPORT_SYMBOL_GPL(ide_do_test_unit_ready); 121 122int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start) 123{ 124 struct ide_atapi_pc pc; 125 126 ide_init_pc(&pc); 127 pc.c[0] = START_STOP; 128 pc.c[4] = start; 129 130 if (drive->media == ide_tape) 131 pc.flags |= PC_FLAG_WAIT_FOR_DSC; 132 133 return ide_queue_pc_tail(drive, disk, &pc); 134} 135EXPORT_SYMBOL_GPL(ide_do_start_stop); 136 137int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on) 138{ 139 struct ide_atapi_pc pc; 140 141 if ((drive->dev_flags & IDE_DFLAG_DOORLOCKING) == 0) 142 return 0; 143 144 ide_init_pc(&pc); 145 pc.c[0] = ALLOW_MEDIUM_REMOVAL; 146 pc.c[4] = on; 147 148 return ide_queue_pc_tail(drive, disk, &pc); 149} 150EXPORT_SYMBOL_GPL(ide_set_media_lock); 151 152void ide_create_request_sense_cmd(ide_drive_t *drive, struct ide_atapi_pc *pc) 153{ 154 ide_init_pc(pc); 155 pc->c[0] = REQUEST_SENSE; 156 if (drive->media == ide_floppy) { 157 pc->c[4] = 255; 158 pc->req_xfer = 18; 159 } else { 160 pc->c[4] = 20; 161 pc->req_xfer = 20; 162 } 163} 164EXPORT_SYMBOL_GPL(ide_create_request_sense_cmd); 165 166void ide_prep_sense(ide_drive_t *drive, struct request *rq) 167{ 168 struct request_sense *sense = &drive->sense_data; 169 struct request *sense_rq = &drive->sense_rq; 170 unsigned int cmd_len, sense_len; 171 172 debug_log("%s: enter\n", __func__); 173 174 switch (drive->media) { 175 case ide_floppy: 176 cmd_len = 255; 177 sense_len = 18; 178 break; 179 case ide_tape: 180 cmd_len = 20; 181 sense_len = 20; 182 break; 183 default: 184 cmd_len = 18; 185 sense_len = 18; 186 } 187 188 BUG_ON(sense_len > sizeof(*sense)); 189 190 if (blk_sense_request(rq) || drive->sense_rq_armed) 191 return; 192 193 memset(sense, 0, sizeof(*sense)); 194 195 blk_rq_init(rq->q, sense_rq); 196 sense_rq->rq_disk = rq->rq_disk; 197 198 sense_rq->data = sense; 199 sense_rq->cmd[0] = GPCMD_REQUEST_SENSE; 200 sense_rq->cmd[4] = cmd_len; 201 sense_rq->data_len = sense_len; 202 203 sense_rq->cmd_type = REQ_TYPE_SENSE; 204 sense_rq->cmd_flags |= REQ_PREEMPT; 205 206 if (drive->media == ide_tape) 207 sense_rq->cmd[13] = REQ_IDETAPE_PC1; 208 209 drive->sense_rq_armed = true; 210} 211EXPORT_SYMBOL_GPL(ide_prep_sense); 212 213void ide_queue_sense_rq(ide_drive_t *drive, void *special) 214{ 215 BUG_ON(!drive->sense_rq_armed); 216 217 drive->sense_rq.special = special; 218 drive->sense_rq_armed = false; 219 220 drive->hwif->rq = NULL; 221 222 elv_add_request(drive->queue, &drive->sense_rq, 223 ELEVATOR_INSERT_FRONT, 0); 224} 225EXPORT_SYMBOL_GPL(ide_queue_sense_rq); 226 227/* 228 * Called when an error was detected during the last packet command. 229 * We queue a request sense packet command at the head of the request 230 * queue. 231 */ 232void ide_retry_pc(ide_drive_t *drive) 233{ 234 struct request *sense_rq = &drive->sense_rq; 235 struct ide_atapi_pc *pc = &drive->request_sense_pc; 236 237 (void)ide_read_error(drive); 238 239 /* init pc from sense_rq */ 240 ide_init_pc(pc); 241 memcpy(pc->c, sense_rq->cmd, 12); 242 pc->buf = sense_rq->data; 243 pc->req_xfer = sense_rq->data_len; 244 245 if (drive->media == ide_tape) 246 set_bit(IDE_AFLAG_IGNORE_DSC, &drive->atapi_flags); 247 248 ide_queue_sense_rq(drive, pc); 249} 250EXPORT_SYMBOL_GPL(ide_retry_pc); 251 252int ide_cd_expiry(ide_drive_t *drive) 253{ 254 struct request *rq = drive->hwif->rq; 255 unsigned long wait = 0; 256 257 debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]); 258 259 /* 260 * Some commands are *slow* and normally take a long time to complete. 261 * Usually we can use the ATAPI "disconnect" to bypass this, but not all 262 * commands/drives support that. Let ide_timer_expiry keep polling us 263 * for these. 264 */ 265 switch (rq->cmd[0]) { 266 case GPCMD_BLANK: 267 case GPCMD_FORMAT_UNIT: 268 case GPCMD_RESERVE_RZONE_TRACK: 269 case GPCMD_CLOSE_TRACK: 270 case GPCMD_FLUSH_CACHE: 271 wait = ATAPI_WAIT_PC; 272 break; 273 default: 274 if (!(rq->cmd_flags & REQ_QUIET)) 275 printk(KERN_INFO "cmd 0x%x timed out\n", 276 rq->cmd[0]); 277 wait = 0; 278 break; 279 } 280 return wait; 281} 282EXPORT_SYMBOL_GPL(ide_cd_expiry); 283 284int ide_cd_get_xferlen(struct request *rq) 285{ 286 if (blk_fs_request(rq)) 287 return 32768; 288 else if (blk_sense_request(rq) || blk_pc_request(rq) || 289 rq->cmd_type == REQ_TYPE_ATA_PC) 290 return rq->data_len; 291 else 292 return 0; 293} 294EXPORT_SYMBOL_GPL(ide_cd_get_xferlen); 295 296void ide_read_bcount_and_ireason(ide_drive_t *drive, u16 *bcount, u8 *ireason) 297{ 298 struct ide_taskfile tf; 299 300 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT | 301 IDE_VALID_LBAM | IDE_VALID_LBAH); 302 303 *bcount = (tf.lbah << 8) | tf.lbam; 304 *ireason = tf.nsect & 3; 305} 306EXPORT_SYMBOL_GPL(ide_read_bcount_and_ireason); 307 308/* 309 * This is the usual interrupt handler which will be called during a packet 310 * command. We will transfer some of the data (as requested by the drive) 311 * and will re-point interrupt handler to us. 312 */ 313static ide_startstop_t ide_pc_intr(ide_drive_t *drive) 314{ 315 struct ide_atapi_pc *pc = drive->pc; 316 ide_hwif_t *hwif = drive->hwif; 317 struct ide_cmd *cmd = &hwif->cmd; 318 struct request *rq = hwif->rq; 319 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 320 xfer_func_t *xferfunc; 321 unsigned int timeout, done; 322 u16 bcount; 323 u8 stat, ireason, dsc = 0; 324 u8 write = !!(pc->flags & PC_FLAG_WRITING); 325 326 debug_log("Enter %s - interrupt handler\n", __func__); 327 328 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD 329 : WAIT_TAPE_CMD; 330 331 /* Clear the interrupt */ 332 stat = tp_ops->read_status(hwif); 333 334 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { 335 int rc; 336 337 drive->waiting_for_dma = 0; 338 rc = hwif->dma_ops->dma_end(drive); 339 ide_dma_unmap_sg(drive, cmd); 340 341 if (rc || (drive->media == ide_tape && (stat & ATA_ERR))) { 342 if (drive->media == ide_floppy) 343 printk(KERN_ERR "%s: DMA %s error\n", 344 drive->name, rq_data_dir(pc->rq) 345 ? "write" : "read"); 346 pc->flags |= PC_FLAG_DMA_ERROR; 347 } else { 348 pc->xferred = pc->req_xfer; 349 if (drive->pc_update_buffers) 350 drive->pc_update_buffers(drive, pc); 351 } 352 debug_log("%s: DMA finished\n", drive->name); 353 } 354 355 /* No more interrupts */ 356 if ((stat & ATA_DRQ) == 0) { 357 int uptodate, error; 358 unsigned int done; 359 360 debug_log("Packet command completed, %d bytes transferred\n", 361 pc->xferred); 362 363 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; 364 365 local_irq_enable_in_hardirq(); 366 367 if (drive->media == ide_tape && 368 (stat & ATA_ERR) && rq->cmd[0] == REQUEST_SENSE) 369 stat &= ~ATA_ERR; 370 371 if ((stat & ATA_ERR) || (pc->flags & PC_FLAG_DMA_ERROR)) { 372 /* Error detected */ 373 debug_log("%s: I/O error\n", drive->name); 374 375 if (drive->media != ide_tape) 376 pc->rq->errors++; 377 378 if (rq->cmd[0] == REQUEST_SENSE) { 379 printk(KERN_ERR "%s: I/O error in request sense" 380 " command\n", drive->name); 381 return ide_do_reset(drive); 382 } 383 384 debug_log("[cmd %x]: check condition\n", rq->cmd[0]); 385 386 /* Retry operation */ 387 ide_retry_pc(drive); 388 389 /* queued, but not started */ 390 return ide_stopped; 391 } 392 pc->error = 0; 393 394 if ((pc->flags & PC_FLAG_WAIT_FOR_DSC) && (stat & ATA_DSC) == 0) 395 dsc = 1; 396 397 /* Command finished - Call the callback function */ 398 uptodate = drive->pc_callback(drive, dsc); 399 400 if (uptodate == 0) 401 drive->failed_pc = NULL; 402 403 if (blk_special_request(rq)) { 404 rq->errors = 0; 405 done = blk_rq_bytes(rq); 406 error = 0; 407 } else { 408 409 if (blk_fs_request(rq) == 0 && uptodate <= 0) { 410 if (rq->errors == 0) 411 rq->errors = -EIO; 412 } 413 414 if (drive->media == ide_tape) 415 done = ide_rq_bytes(rq); /* FIXME */ 416 else 417 done = blk_rq_bytes(rq); 418 419 error = uptodate ? 0 : -EIO; 420 } 421 422 ide_complete_rq(drive, error, done); 423 return ide_stopped; 424 } 425 426 if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) { 427 pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS; 428 printk(KERN_ERR "%s: The device wants to issue more interrupts " 429 "in DMA mode\n", drive->name); 430 ide_dma_off(drive); 431 return ide_do_reset(drive); 432 } 433 434 /* Get the number of bytes to transfer on this interrupt. */ 435 ide_read_bcount_and_ireason(drive, &bcount, &ireason); 436 437 if (ireason & ATAPI_COD) { 438 printk(KERN_ERR "%s: CoD != 0 in %s\n", drive->name, __func__); 439 return ide_do_reset(drive); 440 } 441 442 if (((ireason & ATAPI_IO) == ATAPI_IO) == write) { 443 /* Hopefully, we will never get here */ 444 printk(KERN_ERR "%s: We wanted to %s, but the device wants us " 445 "to %s!\n", drive->name, 446 (ireason & ATAPI_IO) ? "Write" : "Read", 447 (ireason & ATAPI_IO) ? "Read" : "Write"); 448 return ide_do_reset(drive); 449 } 450 451 xferfunc = write ? tp_ops->output_data : tp_ops->input_data; 452 453 if (drive->media == ide_floppy && pc->buf == NULL) { 454 done = min_t(unsigned int, bcount, cmd->nleft); 455 ide_pio_bytes(drive, cmd, write, done); 456 } else if (drive->media == ide_tape && pc->bh) { 457 done = drive->pc_io_buffers(drive, pc, bcount, write); 458 } else { 459 done = min_t(unsigned int, bcount, pc->req_xfer - pc->xferred); 460 xferfunc(drive, NULL, pc->cur_pos, done); 461 } 462 463 /* Update the current position */ 464 pc->xferred += done; 465 pc->cur_pos += done; 466 467 bcount -= done; 468 469 if (bcount) 470 ide_pad_transfer(drive, write, bcount); 471 472 debug_log("[cmd %x] transferred %d bytes, padded %d bytes\n", 473 rq->cmd[0], done, bcount); 474 475 /* And set the interrupt handler again */ 476 ide_set_handler(drive, ide_pc_intr, timeout); 477 return ide_started; 478} 479 480static void ide_init_packet_cmd(struct ide_cmd *cmd, u8 valid_tf, 481 u16 bcount, u8 dma) 482{ 483 cmd->protocol = dma ? ATAPI_PROT_DMA : ATAPI_PROT_PIO; 484 cmd->valid.out.tf = IDE_VALID_LBAH | IDE_VALID_LBAM | 485 IDE_VALID_FEATURE | valid_tf; 486 cmd->tf.command = ATA_CMD_PACKET; 487 cmd->tf.feature = dma; /* Use PIO/DMA */ 488 cmd->tf.lbam = bcount & 0xff; 489 cmd->tf.lbah = (bcount >> 8) & 0xff; 490} 491 492static u8 ide_read_ireason(ide_drive_t *drive) 493{ 494 struct ide_taskfile tf; 495 496 drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_NSECT); 497 498 return tf.nsect & 3; 499} 500 501static u8 ide_wait_ireason(ide_drive_t *drive, u8 ireason) 502{ 503 int retries = 100; 504 505 while (retries-- && ((ireason & ATAPI_COD) == 0 || 506 (ireason & ATAPI_IO))) { 507 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing " 508 "a packet command, retrying\n", drive->name); 509 udelay(100); 510 ireason = ide_read_ireason(drive); 511 if (retries == 0) { 512 printk(KERN_ERR "%s: (IO,CoD != (0,1) while issuing " 513 "a packet command, ignoring\n", 514 drive->name); 515 ireason |= ATAPI_COD; 516 ireason &= ~ATAPI_IO; 517 } 518 } 519 520 return ireason; 521} 522 523static int ide_delayed_transfer_pc(ide_drive_t *drive) 524{ 525 /* Send the actual packet */ 526 drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12); 527 528 /* Timeout for the packet command */ 529 return WAIT_FLOPPY_CMD; 530} 531 532static ide_startstop_t ide_transfer_pc(ide_drive_t *drive) 533{ 534 struct ide_atapi_pc *uninitialized_var(pc); 535 ide_hwif_t *hwif = drive->hwif; 536 struct request *rq = hwif->rq; 537 ide_expiry_t *expiry; 538 unsigned int timeout; 539 int cmd_len; 540 ide_startstop_t startstop; 541 u8 ireason; 542 543 if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) { 544 printk(KERN_ERR "%s: Strange, packet command initiated yet " 545 "DRQ isn't asserted\n", drive->name); 546 return startstop; 547 } 548 549 if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) { 550 if (drive->dma) 551 drive->waiting_for_dma = 1; 552 } 553 554 if (dev_is_idecd(drive)) { 555 /* ATAPI commands get padded out to 12 bytes minimum */ 556 cmd_len = COMMAND_SIZE(rq->cmd[0]); 557 if (cmd_len < ATAPI_MIN_CDB_BYTES) 558 cmd_len = ATAPI_MIN_CDB_BYTES; 559 560 timeout = rq->timeout; 561 expiry = ide_cd_expiry; 562 } else { 563 pc = drive->pc; 564 565 cmd_len = ATAPI_MIN_CDB_BYTES; 566 567 /* 568 * If necessary schedule the packet transfer to occur 'timeout' 569 * miliseconds later in ide_delayed_transfer_pc() after the 570 * device says it's ready for a packet. 571 */ 572 if (drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) { 573 timeout = drive->pc_delay; 574 expiry = &ide_delayed_transfer_pc; 575 } else { 576 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD 577 : WAIT_TAPE_CMD; 578 expiry = NULL; 579 } 580 581 ireason = ide_read_ireason(drive); 582 if (drive->media == ide_tape) 583 ireason = ide_wait_ireason(drive, ireason); 584 585 if ((ireason & ATAPI_COD) == 0 || (ireason & ATAPI_IO)) { 586 printk(KERN_ERR "%s: (IO,CoD) != (0,1) while issuing " 587 "a packet command\n", drive->name); 588 589 return ide_do_reset(drive); 590 } 591 } 592 593 hwif->expiry = expiry; 594 595 /* Set the interrupt routine */ 596 ide_set_handler(drive, 597 (dev_is_idecd(drive) ? drive->irq_handler 598 : ide_pc_intr), 599 timeout); 600 601 /* Send the actual packet */ 602 if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0) 603 hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len); 604 605 /* Begin DMA, if necessary */ 606 if (dev_is_idecd(drive)) { 607 if (drive->dma) 608 hwif->dma_ops->dma_start(drive); 609 } else { 610 if (pc->flags & PC_FLAG_DMA_OK) { 611 pc->flags |= PC_FLAG_DMA_IN_PROGRESS; 612 hwif->dma_ops->dma_start(drive); 613 } 614 } 615 616 return ide_started; 617} 618 619ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_cmd *cmd) 620{ 621 struct ide_atapi_pc *pc; 622 ide_hwif_t *hwif = drive->hwif; 623 ide_expiry_t *expiry = NULL; 624 struct request *rq = hwif->rq; 625 unsigned int timeout; 626 u16 bcount; 627 u8 valid_tf; 628 u8 drq_int = !!(drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT); 629 630 if (dev_is_idecd(drive)) { 631 valid_tf = IDE_VALID_NSECT | IDE_VALID_LBAL; 632 bcount = ide_cd_get_xferlen(rq); 633 expiry = ide_cd_expiry; 634 timeout = ATAPI_WAIT_PC; 635 636 if (drive->dma) 637 drive->dma = !ide_dma_prepare(drive, cmd); 638 } else { 639 pc = drive->pc; 640 641 /* We haven't transferred any data yet */ 642 pc->xferred = 0; 643 pc->cur_pos = pc->buf; 644 645 valid_tf = IDE_VALID_DEVICE; 646 bcount = ((drive->media == ide_tape) ? 647 pc->req_xfer : 648 min(pc->req_xfer, 63 * 1024)); 649 650 if (pc->flags & PC_FLAG_DMA_ERROR) { 651 pc->flags &= ~PC_FLAG_DMA_ERROR; 652 ide_dma_off(drive); 653 } 654 655 if (pc->flags & PC_FLAG_DMA_OK) 656 drive->dma = !ide_dma_prepare(drive, cmd); 657 658 if (!drive->dma) 659 pc->flags &= ~PC_FLAG_DMA_OK; 660 661 timeout = (drive->media == ide_floppy) ? WAIT_FLOPPY_CMD 662 : WAIT_TAPE_CMD; 663 } 664 665 ide_init_packet_cmd(cmd, valid_tf, bcount, drive->dma); 666 667 (void)do_rw_taskfile(drive, cmd); 668 669 if (drq_int) { 670 if (drive->dma) 671 drive->waiting_for_dma = 0; 672 hwif->expiry = expiry; 673 } 674 675 ide_execute_command(drive, cmd, ide_transfer_pc, timeout); 676 677 return drq_int ? ide_started : ide_transfer_pc(drive); 678} 679EXPORT_SYMBOL_GPL(ide_issue_pc); 680