ide-iops.c revision 1574cf6cb4800525be769ee6023c567113fa2d18
1/* 2 * Copyright (C) 2000-2002 Andre Hedrick <andre@linux-ide.org> 3 * Copyright (C) 2003 Red Hat 4 * 5 */ 6 7#include <linux/module.h> 8#include <linux/types.h> 9#include <linux/string.h> 10#include <linux/kernel.h> 11#include <linux/timer.h> 12#include <linux/mm.h> 13#include <linux/interrupt.h> 14#include <linux/major.h> 15#include <linux/errno.h> 16#include <linux/genhd.h> 17#include <linux/blkpg.h> 18#include <linux/slab.h> 19#include <linux/pci.h> 20#include <linux/delay.h> 21#include <linux/ide.h> 22#include <linux/bitops.h> 23#include <linux/nmi.h> 24 25#include <asm/byteorder.h> 26#include <asm/irq.h> 27#include <asm/uaccess.h> 28#include <asm/io.h> 29 30void SELECT_DRIVE (ide_drive_t *drive) 31{ 32 ide_hwif_t *hwif = drive->hwif; 33 const struct ide_port_ops *port_ops = hwif->port_ops; 34 ide_task_t task; 35 36 if (port_ops && port_ops->selectproc) 37 port_ops->selectproc(drive); 38 39 memset(&task, 0, sizeof(task)); 40 task.tf_flags = IDE_TFLAG_OUT_DEVICE; 41 42 drive->hwif->tp_ops->tf_load(drive, &task); 43} 44 45void SELECT_MASK(ide_drive_t *drive, int mask) 46{ 47 const struct ide_port_ops *port_ops = drive->hwif->port_ops; 48 49 if (port_ops && port_ops->maskproc) 50 port_ops->maskproc(drive, mask); 51} 52 53u8 ide_read_error(ide_drive_t *drive) 54{ 55 ide_task_t task; 56 57 memset(&task, 0, sizeof(task)); 58 task.tf_flags = IDE_TFLAG_IN_FEATURE; 59 60 drive->hwif->tp_ops->tf_read(drive, &task); 61 62 return task.tf.error; 63} 64EXPORT_SYMBOL_GPL(ide_read_error); 65 66void ide_fix_driveid(u16 *id) 67{ 68#ifndef __LITTLE_ENDIAN 69# ifdef __BIG_ENDIAN 70 int i; 71 72 for (i = 0; i < 256; i++) 73 id[i] = __le16_to_cpu(id[i]); 74# else 75# error "Please fix <asm/byteorder.h>" 76# endif 77#endif 78} 79 80/* 81 * ide_fixstring() cleans up and (optionally) byte-swaps a text string, 82 * removing leading/trailing blanks and compressing internal blanks. 83 * It is primarily used to tidy up the model name/number fields as 84 * returned by the ATA_CMD_ID_ATA[PI] commands. 85 */ 86 87void ide_fixstring (u8 *s, const int bytecount, const int byteswap) 88{ 89 u8 *p, *end = &s[bytecount & ~1]; /* bytecount must be even */ 90 91 if (byteswap) { 92 /* convert from big-endian to host byte order */ 93 for (p = s ; p != end ; p += 2) 94 be16_to_cpus((u16 *) p); 95 } 96 97 /* strip leading blanks */ 98 p = s; 99 while (s != end && *s == ' ') 100 ++s; 101 /* compress internal blanks and strip trailing blanks */ 102 while (s != end && *s) { 103 if (*s++ != ' ' || (s != end && *s && *s != ' ')) 104 *p++ = *(s-1); 105 } 106 /* wipe out trailing garbage */ 107 while (p != end) 108 *p++ = '\0'; 109} 110 111EXPORT_SYMBOL(ide_fixstring); 112 113/* 114 * This routine busy-waits for the drive status to be not "busy". 115 * It then checks the status for all of the "good" bits and none 116 * of the "bad" bits, and if all is okay it returns 0. All other 117 * cases return error -- caller may then invoke ide_error(). 118 * 119 * This routine should get fixed to not hog the cpu during extra long waits.. 120 * That could be done by busy-waiting for the first jiffy or two, and then 121 * setting a timer to wake up at half second intervals thereafter, 122 * until timeout is achieved, before timing out. 123 */ 124static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout, u8 *rstat) 125{ 126 ide_hwif_t *hwif = drive->hwif; 127 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 128 unsigned long flags; 129 int i; 130 u8 stat; 131 132 udelay(1); /* spec allows drive 400ns to assert "BUSY" */ 133 stat = tp_ops->read_status(hwif); 134 135 if (stat & ATA_BUSY) { 136 local_save_flags(flags); 137 local_irq_enable_in_hardirq(); 138 timeout += jiffies; 139 while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) { 140 if (time_after(jiffies, timeout)) { 141 /* 142 * One last read after the timeout in case 143 * heavy interrupt load made us not make any 144 * progress during the timeout.. 145 */ 146 stat = tp_ops->read_status(hwif); 147 if ((stat & ATA_BUSY) == 0) 148 break; 149 150 local_irq_restore(flags); 151 *rstat = stat; 152 return -EBUSY; 153 } 154 } 155 local_irq_restore(flags); 156 } 157 /* 158 * Allow status to settle, then read it again. 159 * A few rare drives vastly violate the 400ns spec here, 160 * so we'll wait up to 10usec for a "good" status 161 * rather than expensively fail things immediately. 162 * This fix courtesy of Matthew Faupel & Niccolo Rigacci. 163 */ 164 for (i = 0; i < 10; i++) { 165 udelay(1); 166 stat = tp_ops->read_status(hwif); 167 168 if (OK_STAT(stat, good, bad)) { 169 *rstat = stat; 170 return 0; 171 } 172 } 173 *rstat = stat; 174 return -EFAULT; 175} 176 177/* 178 * In case of error returns error value after doing "*startstop = ide_error()". 179 * The caller should return the updated value of "startstop" in this case, 180 * "startstop" is unchanged when the function returns 0. 181 */ 182int ide_wait_stat(ide_startstop_t *startstop, ide_drive_t *drive, u8 good, u8 bad, unsigned long timeout) 183{ 184 int err; 185 u8 stat; 186 187 /* bail early if we've exceeded max_failures */ 188 if (drive->max_failures && (drive->failures > drive->max_failures)) { 189 *startstop = ide_stopped; 190 return 1; 191 } 192 193 err = __ide_wait_stat(drive, good, bad, timeout, &stat); 194 195 if (err) { 196 char *s = (err == -EBUSY) ? "status timeout" : "status error"; 197 *startstop = ide_error(drive, s, stat); 198 } 199 200 return err; 201} 202 203EXPORT_SYMBOL(ide_wait_stat); 204 205/** 206 * ide_in_drive_list - look for drive in black/white list 207 * @id: drive identifier 208 * @table: list to inspect 209 * 210 * Look for a drive in the blacklist and the whitelist tables 211 * Returns 1 if the drive is found in the table. 212 */ 213 214int ide_in_drive_list(u16 *id, const struct drive_list_entry *table) 215{ 216 for ( ; table->id_model; table++) 217 if ((!strcmp(table->id_model, (char *)&id[ATA_ID_PROD])) && 218 (!table->id_firmware || 219 strstr((char *)&id[ATA_ID_FW_REV], table->id_firmware))) 220 return 1; 221 return 0; 222} 223 224EXPORT_SYMBOL_GPL(ide_in_drive_list); 225 226/* 227 * Early UDMA66 devices don't set bit14 to 1, only bit13 is valid. 228 * We list them here and depend on the device side cable detection for them. 229 * 230 * Some optical devices with the buggy firmwares have the same problem. 231 */ 232static const struct drive_list_entry ivb_list[] = { 233 { "QUANTUM FIREBALLlct10 05" , "A03.0900" }, 234 { "TSSTcorp CDDVDW SH-S202J" , "SB00" }, 235 { "TSSTcorp CDDVDW SH-S202J" , "SB01" }, 236 { "TSSTcorp CDDVDW SH-S202N" , "SB00" }, 237 { "TSSTcorp CDDVDW SH-S202N" , "SB01" }, 238 { "TSSTcorp CDDVDW SH-S202H" , "SB00" }, 239 { "TSSTcorp CDDVDW SH-S202H" , "SB01" }, 240 { "SAMSUNG SP0822N" , "WA100-10" }, 241 { NULL , NULL } 242}; 243 244/* 245 * All hosts that use the 80c ribbon must use! 246 * The name is derived from upper byte of word 93 and the 80c ribbon. 247 */ 248u8 eighty_ninty_three (ide_drive_t *drive) 249{ 250 ide_hwif_t *hwif = drive->hwif; 251 u16 *id = drive->id; 252 int ivb = ide_in_drive_list(id, ivb_list); 253 254 if (hwif->cbl == ATA_CBL_PATA40_SHORT) 255 return 1; 256 257 if (ivb) 258 printk(KERN_DEBUG "%s: skipping word 93 validity check\n", 259 drive->name); 260 261 if (ata_id_is_sata(id) && !ivb) 262 return 1; 263 264 if (hwif->cbl != ATA_CBL_PATA80 && !ivb) 265 goto no_80w; 266 267 /* 268 * FIXME: 269 * - change master/slave IDENTIFY order 270 * - force bit13 (80c cable present) check also for !ivb devices 271 * (unless the slave device is pre-ATA3) 272 */ 273 if ((id[ATA_ID_HW_CONFIG] & 0x4000) || 274 (ivb && (id[ATA_ID_HW_CONFIG] & 0x2000))) 275 return 1; 276 277no_80w: 278 if (drive->dev_flags & IDE_DFLAG_UDMA33_WARNED) 279 return 0; 280 281 printk(KERN_WARNING "%s: %s side 80-wire cable detection failed, " 282 "limiting max speed to UDMA33\n", 283 drive->name, 284 hwif->cbl == ATA_CBL_PATA80 ? "drive" : "host"); 285 286 drive->dev_flags |= IDE_DFLAG_UDMA33_WARNED; 287 288 return 0; 289} 290 291int ide_driveid_update(ide_drive_t *drive) 292{ 293 ide_hwif_t *hwif = drive->hwif; 294 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 295 u16 *id; 296 unsigned long flags; 297 u8 stat; 298 299 /* 300 * Re-read drive->id for possible DMA mode 301 * change (copied from ide-probe.c) 302 */ 303 304 SELECT_MASK(drive, 1); 305 tp_ops->set_irq(hwif, 0); 306 msleep(50); 307 tp_ops->exec_command(hwif, ATA_CMD_ID_ATA); 308 309 if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 1)) { 310 SELECT_MASK(drive, 0); 311 return 0; 312 } 313 314 msleep(50); /* wait for IRQ and ATA_DRQ */ 315 stat = tp_ops->read_status(hwif); 316 317 if (!OK_STAT(stat, ATA_DRQ, BAD_R_STAT)) { 318 SELECT_MASK(drive, 0); 319 printk("%s: CHECK for good STATUS\n", drive->name); 320 return 0; 321 } 322 local_irq_save(flags); 323 SELECT_MASK(drive, 0); 324 id = kmalloc(SECTOR_SIZE, GFP_ATOMIC); 325 if (!id) { 326 local_irq_restore(flags); 327 return 0; 328 } 329 tp_ops->input_data(drive, NULL, id, SECTOR_SIZE); 330 (void)tp_ops->read_status(hwif); /* clear drive IRQ */ 331 local_irq_enable(); 332 local_irq_restore(flags); 333 ide_fix_driveid(id); 334 335 drive->id[ATA_ID_UDMA_MODES] = id[ATA_ID_UDMA_MODES]; 336 drive->id[ATA_ID_MWDMA_MODES] = id[ATA_ID_MWDMA_MODES]; 337 drive->id[ATA_ID_SWDMA_MODES] = id[ATA_ID_SWDMA_MODES]; 338 /* anything more ? */ 339 340 kfree(id); 341 342 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) && ide_id_dma_bug(drive)) 343 ide_dma_off(drive); 344 345 return 1; 346} 347 348int ide_config_drive_speed(ide_drive_t *drive, u8 speed) 349{ 350 ide_hwif_t *hwif = drive->hwif; 351 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 352 u16 *id = drive->id, i; 353 int error = 0; 354 u8 stat; 355 ide_task_t task; 356 357#ifdef CONFIG_BLK_DEV_IDEDMA 358 if (hwif->dma_ops) /* check if host supports DMA */ 359 hwif->dma_ops->dma_host_set(drive, 0); 360#endif 361 362 /* Skip setting PIO flow-control modes on pre-EIDE drives */ 363 if ((speed & 0xf8) == XFER_PIO_0 && ata_id_has_iordy(drive->id) == 0) 364 goto skip; 365 366 /* 367 * Don't use ide_wait_cmd here - it will 368 * attempt to set_geometry and recalibrate, 369 * but for some reason these don't work at 370 * this point (lost interrupt). 371 */ 372 /* 373 * Select the drive, and issue the SETFEATURES command 374 */ 375 disable_irq_nosync(hwif->irq); 376 377 /* 378 * FIXME: we race against the running IRQ here if 379 * this is called from non IRQ context. If we use 380 * disable_irq() we hang on the error path. Work 381 * is needed. 382 */ 383 384 udelay(1); 385 SELECT_DRIVE(drive); 386 SELECT_MASK(drive, 1); 387 udelay(1); 388 tp_ops->set_irq(hwif, 0); 389 390 memset(&task, 0, sizeof(task)); 391 task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT; 392 task.tf.feature = SETFEATURES_XFER; 393 task.tf.nsect = speed; 394 395 tp_ops->tf_load(drive, &task); 396 397 tp_ops->exec_command(hwif, ATA_CMD_SET_FEATURES); 398 399 if (drive->quirk_list == 2) 400 tp_ops->set_irq(hwif, 1); 401 402 error = __ide_wait_stat(drive, drive->ready_stat, 403 ATA_BUSY | ATA_DRQ | ATA_ERR, 404 WAIT_CMD, &stat); 405 406 SELECT_MASK(drive, 0); 407 408 enable_irq(hwif->irq); 409 410 if (error) { 411 (void) ide_dump_status(drive, "set_drive_speed_status", stat); 412 return error; 413 } 414 415 id[ATA_ID_UDMA_MODES] &= ~0xFF00; 416 id[ATA_ID_MWDMA_MODES] &= ~0x0F00; 417 id[ATA_ID_SWDMA_MODES] &= ~0x0F00; 418 419 skip: 420#ifdef CONFIG_BLK_DEV_IDEDMA 421 if (speed >= XFER_SW_DMA_0 && (drive->dev_flags & IDE_DFLAG_USING_DMA)) 422 hwif->dma_ops->dma_host_set(drive, 1); 423 else if (hwif->dma_ops) /* check if host supports DMA */ 424 ide_dma_off_quietly(drive); 425#endif 426 427 if (speed >= XFER_UDMA_0) { 428 i = 1 << (speed - XFER_UDMA_0); 429 id[ATA_ID_UDMA_MODES] |= (i << 8 | i); 430 } else if (speed >= XFER_MW_DMA_0) { 431 i = 1 << (speed - XFER_MW_DMA_0); 432 id[ATA_ID_MWDMA_MODES] |= (i << 8 | i); 433 } else if (speed >= XFER_SW_DMA_0) { 434 i = 1 << (speed - XFER_SW_DMA_0); 435 id[ATA_ID_SWDMA_MODES] |= (i << 8 | i); 436 } 437 438 if (!drive->init_speed) 439 drive->init_speed = speed; 440 drive->current_speed = speed; 441 return error; 442} 443 444/* 445 * This should get invoked any time we exit the driver to 446 * wait for an interrupt response from a drive. handler() points 447 * at the appropriate code to handle the next interrupt, and a 448 * timer is started to prevent us from waiting forever in case 449 * something goes wrong (see the ide_timer_expiry() handler later on). 450 * 451 * See also ide_execute_command 452 */ 453static void __ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, 454 unsigned int timeout, ide_expiry_t *expiry) 455{ 456 ide_hwif_t *hwif = drive->hwif; 457 458 BUG_ON(hwif->handler); 459 hwif->handler = handler; 460 hwif->expiry = expiry; 461 hwif->timer.expires = jiffies + timeout; 462 hwif->req_gen_timer = hwif->req_gen; 463 add_timer(&hwif->timer); 464} 465 466void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, 467 unsigned int timeout, ide_expiry_t *expiry) 468{ 469 ide_hwif_t *hwif = drive->hwif; 470 unsigned long flags; 471 472 spin_lock_irqsave(&hwif->lock, flags); 473 __ide_set_handler(drive, handler, timeout, expiry); 474 spin_unlock_irqrestore(&hwif->lock, flags); 475} 476 477EXPORT_SYMBOL(ide_set_handler); 478 479/** 480 * ide_execute_command - execute an IDE command 481 * @drive: IDE drive to issue the command against 482 * @command: command byte to write 483 * @handler: handler for next phase 484 * @timeout: timeout for command 485 * @expiry: handler to run on timeout 486 * 487 * Helper function to issue an IDE command. This handles the 488 * atomicity requirements, command timing and ensures that the 489 * handler and IRQ setup do not race. All IDE command kick off 490 * should go via this function or do equivalent locking. 491 */ 492 493void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler, 494 unsigned timeout, ide_expiry_t *expiry) 495{ 496 ide_hwif_t *hwif = drive->hwif; 497 unsigned long flags; 498 499 spin_lock_irqsave(&hwif->lock, flags); 500 __ide_set_handler(drive, handler, timeout, expiry); 501 hwif->tp_ops->exec_command(hwif, cmd); 502 /* 503 * Drive takes 400nS to respond, we must avoid the IRQ being 504 * serviced before that. 505 * 506 * FIXME: we could skip this delay with care on non shared devices 507 */ 508 ndelay(400); 509 spin_unlock_irqrestore(&hwif->lock, flags); 510} 511EXPORT_SYMBOL(ide_execute_command); 512 513void ide_execute_pkt_cmd(ide_drive_t *drive) 514{ 515 ide_hwif_t *hwif = drive->hwif; 516 unsigned long flags; 517 518 spin_lock_irqsave(&hwif->lock, flags); 519 hwif->tp_ops->exec_command(hwif, ATA_CMD_PACKET); 520 ndelay(400); 521 spin_unlock_irqrestore(&hwif->lock, flags); 522} 523EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd); 524 525static inline void ide_complete_drive_reset(ide_drive_t *drive, int err) 526{ 527 struct request *rq = drive->hwif->rq; 528 529 if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET) 530 ide_end_request(drive, err ? err : 1, 0); 531} 532 533/* needed below */ 534static ide_startstop_t do_reset1 (ide_drive_t *, int); 535 536/* 537 * atapi_reset_pollfunc() gets invoked to poll the interface for completion every 50ms 538 * during an atapi drive reset operation. If the drive has not yet responded, 539 * and we have not yet hit our maximum waiting time, then the timer is restarted 540 * for another 50ms. 541 */ 542static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive) 543{ 544 ide_hwif_t *hwif = drive->hwif; 545 u8 stat; 546 547 SELECT_DRIVE(drive); 548 udelay (10); 549 stat = hwif->tp_ops->read_status(hwif); 550 551 if (OK_STAT(stat, 0, ATA_BUSY)) 552 printk("%s: ATAPI reset complete\n", drive->name); 553 else { 554 if (time_before(jiffies, hwif->poll_timeout)) { 555 ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL); 556 /* continue polling */ 557 return ide_started; 558 } 559 /* end of polling */ 560 hwif->polling = 0; 561 printk("%s: ATAPI reset timed-out, status=0x%02x\n", 562 drive->name, stat); 563 /* do it the old fashioned way */ 564 return do_reset1(drive, 1); 565 } 566 /* done polling */ 567 hwif->polling = 0; 568 ide_complete_drive_reset(drive, 0); 569 return ide_stopped; 570} 571 572static void ide_reset_report_error(ide_hwif_t *hwif, u8 err) 573{ 574 static const char *err_master_vals[] = 575 { NULL, "passed", "formatter device error", 576 "sector buffer error", "ECC circuitry error", 577 "controlling MPU error" }; 578 579 u8 err_master = err & 0x7f; 580 581 printk(KERN_ERR "%s: reset: master: ", hwif->name); 582 if (err_master && err_master < 6) 583 printk(KERN_CONT "%s", err_master_vals[err_master]); 584 else 585 printk(KERN_CONT "error (0x%02x?)", err); 586 if (err & 0x80) 587 printk(KERN_CONT "; slave: failed"); 588 printk(KERN_CONT "\n"); 589} 590 591/* 592 * reset_pollfunc() gets invoked to poll the interface for completion every 50ms 593 * during an ide reset operation. If the drives have not yet responded, 594 * and we have not yet hit our maximum waiting time, then the timer is restarted 595 * for another 50ms. 596 */ 597static ide_startstop_t reset_pollfunc (ide_drive_t *drive) 598{ 599 ide_hwif_t *hwif = drive->hwif; 600 const struct ide_port_ops *port_ops = hwif->port_ops; 601 u8 tmp; 602 int err = 0; 603 604 if (port_ops && port_ops->reset_poll) { 605 err = port_ops->reset_poll(drive); 606 if (err) { 607 printk(KERN_ERR "%s: host reset_poll failure for %s.\n", 608 hwif->name, drive->name); 609 goto out; 610 } 611 } 612 613 tmp = hwif->tp_ops->read_status(hwif); 614 615 if (!OK_STAT(tmp, 0, ATA_BUSY)) { 616 if (time_before(jiffies, hwif->poll_timeout)) { 617 ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL); 618 /* continue polling */ 619 return ide_started; 620 } 621 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp); 622 drive->failures++; 623 err = -EIO; 624 } else { 625 tmp = ide_read_error(drive); 626 627 if (tmp == 1) { 628 printk(KERN_INFO "%s: reset: success\n", hwif->name); 629 drive->failures = 0; 630 } else { 631 ide_reset_report_error(hwif, tmp); 632 drive->failures++; 633 err = -EIO; 634 } 635 } 636out: 637 hwif->polling = 0; /* done polling */ 638 ide_complete_drive_reset(drive, err); 639 return ide_stopped; 640} 641 642static void ide_disk_pre_reset(ide_drive_t *drive) 643{ 644 int legacy = (drive->id[ATA_ID_CFS_ENABLE_2] & 0x0400) ? 0 : 1; 645 646 drive->special.all = 0; 647 drive->special.b.set_geometry = legacy; 648 drive->special.b.recalibrate = legacy; 649 650 drive->mult_count = 0; 651 drive->dev_flags &= ~IDE_DFLAG_PARKED; 652 653 if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0 && 654 (drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) 655 drive->mult_req = 0; 656 657 if (drive->mult_req != drive->mult_count) 658 drive->special.b.set_multmode = 1; 659} 660 661static void pre_reset(ide_drive_t *drive) 662{ 663 const struct ide_port_ops *port_ops = drive->hwif->port_ops; 664 665 if (drive->media == ide_disk) 666 ide_disk_pre_reset(drive); 667 else 668 drive->dev_flags |= IDE_DFLAG_POST_RESET; 669 670 if (drive->dev_flags & IDE_DFLAG_USING_DMA) { 671 if (drive->crc_count) 672 ide_check_dma_crc(drive); 673 else 674 ide_dma_off(drive); 675 } 676 677 if ((drive->dev_flags & IDE_DFLAG_KEEP_SETTINGS) == 0) { 678 if ((drive->dev_flags & IDE_DFLAG_USING_DMA) == 0) { 679 drive->dev_flags &= ~IDE_DFLAG_UNMASK; 680 drive->io_32bit = 0; 681 } 682 return; 683 } 684 685 if (port_ops && port_ops->pre_reset) 686 port_ops->pre_reset(drive); 687 688 if (drive->current_speed != 0xff) 689 drive->desired_speed = drive->current_speed; 690 drive->current_speed = 0xff; 691} 692 693/* 694 * do_reset1() attempts to recover a confused drive by resetting it. 695 * Unfortunately, resetting a disk drive actually resets all devices on 696 * the same interface, so it can really be thought of as resetting the 697 * interface rather than resetting the drive. 698 * 699 * ATAPI devices have their own reset mechanism which allows them to be 700 * individually reset without clobbering other devices on the same interface. 701 * 702 * Unfortunately, the IDE interface does not generate an interrupt to let 703 * us know when the reset operation has finished, so we must poll for this. 704 * Equally poor, though, is the fact that this may a very long time to complete, 705 * (up to 30 seconds worstcase). So, instead of busy-waiting here for it, 706 * we set a timer to poll at 50ms intervals. 707 */ 708static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi) 709{ 710 ide_hwif_t *hwif = drive->hwif; 711 struct ide_io_ports *io_ports = &hwif->io_ports; 712 const struct ide_tp_ops *tp_ops = hwif->tp_ops; 713 const struct ide_port_ops *port_ops; 714 ide_drive_t *tdrive; 715 unsigned long flags, timeout; 716 int i; 717 DEFINE_WAIT(wait); 718 719 spin_lock_irqsave(&hwif->lock, flags); 720 721 /* We must not reset with running handlers */ 722 BUG_ON(hwif->handler != NULL); 723 724 /* For an ATAPI device, first try an ATAPI SRST. */ 725 if (drive->media != ide_disk && !do_not_try_atapi) { 726 pre_reset(drive); 727 SELECT_DRIVE(drive); 728 udelay (20); 729 tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET); 730 ndelay(400); 731 hwif->poll_timeout = jiffies + WAIT_WORSTCASE; 732 hwif->polling = 1; 733 __ide_set_handler(drive, &atapi_reset_pollfunc, HZ/20, NULL); 734 spin_unlock_irqrestore(&hwif->lock, flags); 735 return ide_started; 736 } 737 738 /* We must not disturb devices in the IDE_DFLAG_PARKED state. */ 739 do { 740 unsigned long now; 741 742 prepare_to_wait(&ide_park_wq, &wait, TASK_UNINTERRUPTIBLE); 743 timeout = jiffies; 744 ide_port_for_each_present_dev(i, tdrive, hwif) { 745 if ((tdrive->dev_flags & IDE_DFLAG_PARKED) && 746 time_after(tdrive->sleep, timeout)) 747 timeout = tdrive->sleep; 748 } 749 750 now = jiffies; 751 if (time_before_eq(timeout, now)) 752 break; 753 754 spin_unlock_irqrestore(&hwif->lock, flags); 755 timeout = schedule_timeout_uninterruptible(timeout - now); 756 spin_lock_irqsave(&hwif->lock, flags); 757 } while (timeout); 758 finish_wait(&ide_park_wq, &wait); 759 760 /* 761 * First, reset any device state data we were maintaining 762 * for any of the drives on this interface. 763 */ 764 ide_port_for_each_dev(i, tdrive, hwif) 765 pre_reset(tdrive); 766 767 if (io_ports->ctl_addr == 0) { 768 spin_unlock_irqrestore(&hwif->lock, flags); 769 ide_complete_drive_reset(drive, -ENXIO); 770 return ide_stopped; 771 } 772 773 /* 774 * Note that we also set nIEN while resetting the device, 775 * to mask unwanted interrupts from the interface during the reset. 776 * However, due to the design of PC hardware, this will cause an 777 * immediate interrupt due to the edge transition it produces. 778 * This single interrupt gives us a "fast poll" for drives that 779 * recover from reset very quickly, saving us the first 50ms wait time. 780 * 781 * TODO: add ->softreset method and stop abusing ->set_irq 782 */ 783 /* set SRST and nIEN */ 784 tp_ops->set_irq(hwif, 4); 785 /* more than enough time */ 786 udelay(10); 787 /* clear SRST, leave nIEN (unless device is on the quirk list) */ 788 tp_ops->set_irq(hwif, drive->quirk_list == 2); 789 /* more than enough time */ 790 udelay(10); 791 hwif->poll_timeout = jiffies + WAIT_WORSTCASE; 792 hwif->polling = 1; 793 __ide_set_handler(drive, &reset_pollfunc, HZ/20, NULL); 794 795 /* 796 * Some weird controller like resetting themselves to a strange 797 * state when the disks are reset this way. At least, the Winbond 798 * 553 documentation says that 799 */ 800 port_ops = hwif->port_ops; 801 if (port_ops && port_ops->resetproc) 802 port_ops->resetproc(drive); 803 804 spin_unlock_irqrestore(&hwif->lock, flags); 805 return ide_started; 806} 807 808/* 809 * ide_do_reset() is the entry point to the drive/interface reset code. 810 */ 811 812ide_startstop_t ide_do_reset (ide_drive_t *drive) 813{ 814 return do_reset1(drive, 0); 815} 816 817EXPORT_SYMBOL(ide_do_reset); 818 819/* 820 * ide_wait_not_busy() waits for the currently selected device on the hwif 821 * to report a non-busy status, see comments in ide_probe_port(). 822 */ 823int ide_wait_not_busy(ide_hwif_t *hwif, unsigned long timeout) 824{ 825 u8 stat = 0; 826 827 while(timeout--) { 828 /* 829 * Turn this into a schedule() sleep once I'm sure 830 * about locking issues (2.5 work ?). 831 */ 832 mdelay(1); 833 stat = hwif->tp_ops->read_status(hwif); 834 if ((stat & ATA_BUSY) == 0) 835 return 0; 836 /* 837 * Assume a value of 0xff means nothing is connected to 838 * the interface and it doesn't implement the pull-down 839 * resistor on D7. 840 */ 841 if (stat == 0xff) 842 return -ENODEV; 843 touch_softlockup_watchdog(); 844 touch_nmi_watchdog(); 845 } 846 return -EBUSY; 847} 848