ide-probe.c revision a14dc57495899175a0827673fe23ed17b5653896
1/* 2 * Copyright (C) 1994-1998 Linus Torvalds & authors (see below) 3 * Copyright (C) 2005, 2007 Bartlomiej Zolnierkiewicz 4 */ 5 6/* 7 * Mostly written by Mark Lord <mlord@pobox.com> 8 * and Gadi Oxman <gadio@netvision.net.il> 9 * and Andre Hedrick <andre@linux-ide.org> 10 * 11 * See linux/MAINTAINERS for address of current maintainer. 12 * 13 * This is the IDE probe module, as evolved from hd.c and ide.c. 14 * 15 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot 16 * by Andrea Arcangeli 17 */ 18 19#include <linux/module.h> 20#include <linux/types.h> 21#include <linux/string.h> 22#include <linux/kernel.h> 23#include <linux/timer.h> 24#include <linux/mm.h> 25#include <linux/interrupt.h> 26#include <linux/major.h> 27#include <linux/errno.h> 28#include <linux/genhd.h> 29#include <linux/slab.h> 30#include <linux/delay.h> 31#include <linux/ide.h> 32#include <linux/spinlock.h> 33#include <linux/kmod.h> 34#include <linux/pci.h> 35#include <linux/scatterlist.h> 36 37#include <asm/byteorder.h> 38#include <asm/irq.h> 39#include <asm/uaccess.h> 40#include <asm/io.h> 41 42/** 43 * generic_id - add a generic drive id 44 * @drive: drive to make an ID block for 45 * 46 * Add a fake id field to the drive we are passed. This allows 47 * use to skip a ton of NULL checks (which people always miss) 48 * and make drive properties unconditional outside of this file 49 */ 50 51static void generic_id(ide_drive_t *drive) 52{ 53 drive->id->cyls = drive->cyl; 54 drive->id->heads = drive->head; 55 drive->id->sectors = drive->sect; 56 drive->id->cur_cyls = drive->cyl; 57 drive->id->cur_heads = drive->head; 58 drive->id->cur_sectors = drive->sect; 59} 60 61static void ide_disk_init_chs(ide_drive_t *drive) 62{ 63 struct hd_driveid *id = drive->id; 64 65 /* Extract geometry if we did not already have one for the drive */ 66 if (!drive->cyl || !drive->head || !drive->sect) { 67 drive->cyl = drive->bios_cyl = id->cyls; 68 drive->head = drive->bios_head = id->heads; 69 drive->sect = drive->bios_sect = id->sectors; 70 } 71 72 /* Handle logical geometry translation by the drive */ 73 if ((id->field_valid & 1) && id->cur_cyls && 74 id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) { 75 drive->cyl = id->cur_cyls; 76 drive->head = id->cur_heads; 77 drive->sect = id->cur_sectors; 78 } 79 80 /* Use physical geometry if what we have still makes no sense */ 81 if (drive->head > 16 && id->heads && id->heads <= 16) { 82 drive->cyl = id->cyls; 83 drive->head = id->heads; 84 drive->sect = id->sectors; 85 } 86} 87 88static void ide_disk_init_mult_count(ide_drive_t *drive) 89{ 90 struct hd_driveid *id = drive->id; 91 92 drive->mult_count = 0; 93 if (id->max_multsect) { 94#ifdef CONFIG_IDEDISK_MULTI_MODE 95 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0; 96 id->multsect_valid = id->multsect ? 1 : 0; 97 drive->mult_req = id->multsect_valid ? id->max_multsect : 0; 98 drive->special.b.set_multmode = drive->mult_req ? 1 : 0; 99#else /* original, pre IDE-NFG, per request of AC */ 100 drive->mult_req = 0; 101 if (drive->mult_req > id->max_multsect) 102 drive->mult_req = id->max_multsect; 103 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect)) 104 drive->special.b.set_multmode = 1; 105#endif 106 } 107} 108 109/** 110 * do_identify - identify a drive 111 * @drive: drive to identify 112 * @cmd: command used 113 * 114 * Called when we have issued a drive identify command to 115 * read and parse the results. This function is run with 116 * interrupts disabled. 117 */ 118 119static inline void do_identify (ide_drive_t *drive, u8 cmd) 120{ 121 ide_hwif_t *hwif = HWIF(drive); 122 int bswap = 1; 123 struct hd_driveid *id; 124 125 id = drive->id; 126 /* read 512 bytes of id info */ 127 hwif->ata_input_data(drive, id, SECTOR_WORDS); 128 129 drive->id_read = 1; 130 local_irq_enable(); 131#ifdef DEBUG 132 printk(KERN_INFO "%s: dumping identify data\n", drive->name); 133 ide_dump_identify((u8 *)id); 134#endif 135 ide_fix_driveid(id); 136 137#if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA) 138 /* 139 * EATA SCSI controllers do a hardware ATA emulation: 140 * Ignore them if there is a driver for them available. 141 */ 142 if ((id->model[0] == 'P' && id->model[1] == 'M') || 143 (id->model[0] == 'S' && id->model[1] == 'K')) { 144 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model); 145 goto err_misc; 146 } 147#endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */ 148 149 /* 150 * WIN_IDENTIFY returns little-endian info, 151 * WIN_PIDENTIFY *usually* returns little-endian info. 152 */ 153 if (cmd == WIN_PIDENTIFY) { 154 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */ 155 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */ 156 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */ 157 /* Vertos drives may still be weird */ 158 bswap ^= 1; 159 } 160 ide_fixstring(id->model, sizeof(id->model), bswap); 161 ide_fixstring(id->fw_rev, sizeof(id->fw_rev), bswap); 162 ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap); 163 164 /* we depend on this a lot! */ 165 id->model[sizeof(id->model)-1] = '\0'; 166 167 if (strstr(id->model, "E X A B Y T E N E S T")) 168 goto err_misc; 169 170 printk("%s: %s, ", drive->name, id->model); 171 drive->present = 1; 172 drive->dead = 0; 173 174 /* 175 * Check for an ATAPI device 176 */ 177 if (cmd == WIN_PIDENTIFY) { 178 u8 type = (id->config >> 8) & 0x1f; 179 printk("ATAPI "); 180 switch (type) { 181 case ide_floppy: 182 if (!strstr(id->model, "CD-ROM")) { 183 if (!strstr(id->model, "oppy") && 184 !strstr(id->model, "poyp") && 185 !strstr(id->model, "ZIP")) 186 printk("cdrom or floppy?, assuming "); 187 if (drive->media != ide_cdrom) { 188 printk ("FLOPPY"); 189 drive->removable = 1; 190 break; 191 } 192 } 193 /* Early cdrom models used zero */ 194 type = ide_cdrom; 195 case ide_cdrom: 196 drive->removable = 1; 197#ifdef CONFIG_PPC 198 /* kludge for Apple PowerBook internal zip */ 199 if (!strstr(id->model, "CD-ROM") && 200 strstr(id->model, "ZIP")) { 201 printk ("FLOPPY"); 202 type = ide_floppy; 203 break; 204 } 205#endif 206 printk ("CD/DVD-ROM"); 207 break; 208 case ide_tape: 209 printk ("TAPE"); 210 break; 211 case ide_optical: 212 printk ("OPTICAL"); 213 drive->removable = 1; 214 break; 215 default: 216 printk("UNKNOWN (type %d)", type); 217 break; 218 } 219 printk (" drive\n"); 220 drive->media = type; 221 /* an ATAPI device ignores DRDY */ 222 drive->ready_stat = 0; 223 return; 224 } 225 226 /* 227 * Not an ATAPI device: looks like a "regular" hard disk 228 */ 229 230 /* 231 * 0x848a = CompactFlash device 232 * These are *not* removable in Linux definition of the term 233 */ 234 235 if ((id->config != 0x848a) && (id->config & (1<<7))) 236 drive->removable = 1; 237 238 drive->media = ide_disk; 239 printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" ); 240 241 return; 242 243err_misc: 244 kfree(id); 245 drive->present = 0; 246 return; 247} 248 249/** 250 * actual_try_to_identify - send ata/atapi identify 251 * @drive: drive to identify 252 * @cmd: command to use 253 * 254 * try_to_identify() sends an ATA(PI) IDENTIFY request to a drive 255 * and waits for a response. It also monitors irqs while this is 256 * happening, in hope of automatically determining which one is 257 * being used by the interface. 258 * 259 * Returns: 0 device was identified 260 * 1 device timed-out (no response to identify request) 261 * 2 device aborted the command (refused to identify itself) 262 */ 263 264static int actual_try_to_identify (ide_drive_t *drive, u8 cmd) 265{ 266 ide_hwif_t *hwif = HWIF(drive); 267 int rc; 268 unsigned long hd_status; 269 unsigned long timeout; 270 u8 s = 0, a = 0; 271 272 /* take a deep breath */ 273 msleep(50); 274 275 if (IDE_CONTROL_REG) { 276 a = hwif->INB(IDE_ALTSTATUS_REG); 277 s = hwif->INB(IDE_STATUS_REG); 278 if ((a ^ s) & ~INDEX_STAT) { 279 printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of " 280 "ALTSTATUS(0x%02x)\n", drive->name, s, a); 281 /* ancient Seagate drives, broken interfaces */ 282 hd_status = IDE_STATUS_REG; 283 } else { 284 /* use non-intrusive polling */ 285 hd_status = IDE_ALTSTATUS_REG; 286 } 287 } else 288 hd_status = IDE_STATUS_REG; 289 290 /* set features register for atapi 291 * identify command to be sure of reply 292 */ 293 if ((cmd == WIN_PIDENTIFY)) 294 /* disable dma & overlap */ 295 hwif->OUTB(0, IDE_FEATURE_REG); 296 297 /* ask drive for ID */ 298 hwif->OUTB(cmd, IDE_COMMAND_REG); 299 300 timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2; 301 timeout += jiffies; 302 do { 303 if (time_after(jiffies, timeout)) { 304 /* drive timed-out */ 305 return 1; 306 } 307 /* give drive a breather */ 308 msleep(50); 309 } while ((hwif->INB(hd_status)) & BUSY_STAT); 310 311 /* wait for IRQ and DRQ_STAT */ 312 msleep(50); 313 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) { 314 unsigned long flags; 315 316 /* local CPU only; some systems need this */ 317 local_irq_save(flags); 318 /* drive returned ID */ 319 do_identify(drive, cmd); 320 /* drive responded with ID */ 321 rc = 0; 322 /* clear drive IRQ */ 323 (void) hwif->INB(IDE_STATUS_REG); 324 local_irq_restore(flags); 325 } else { 326 /* drive refused ID */ 327 rc = 2; 328 } 329 return rc; 330} 331 332/** 333 * try_to_identify - try to identify a drive 334 * @drive: drive to probe 335 * @cmd: command to use 336 * 337 * Issue the identify command and then do IRQ probing to 338 * complete the identification when needed by finding the 339 * IRQ the drive is attached to 340 */ 341 342static int try_to_identify (ide_drive_t *drive, u8 cmd) 343{ 344 ide_hwif_t *hwif = HWIF(drive); 345 int retval; 346 int autoprobe = 0; 347 unsigned long cookie = 0; 348 349 /* 350 * Disable device irq unless we need to 351 * probe for it. Otherwise we'll get spurious 352 * interrupts during the identify-phase that 353 * the irq handler isn't expecting. 354 */ 355 if (IDE_CONTROL_REG) { 356 if (!hwif->irq) { 357 autoprobe = 1; 358 cookie = probe_irq_on(); 359 } 360 ide_set_irq(drive, autoprobe); 361 } 362 363 retval = actual_try_to_identify(drive, cmd); 364 365 if (autoprobe) { 366 int irq; 367 368 ide_set_irq(drive, 0); 369 /* clear drive IRQ */ 370 (void) hwif->INB(IDE_STATUS_REG); 371 udelay(5); 372 irq = probe_irq_off(cookie); 373 if (!hwif->irq) { 374 if (irq > 0) { 375 hwif->irq = irq; 376 } else { 377 /* Mmmm.. multiple IRQs.. 378 * don't know which was ours 379 */ 380 printk("%s: IRQ probe failed (0x%lx)\n", 381 drive->name, cookie); 382 } 383 } 384 } 385 return retval; 386} 387 388static int ide_busy_sleep(ide_hwif_t *hwif) 389{ 390 unsigned long timeout = jiffies + WAIT_WORSTCASE; 391 u8 stat; 392 393 do { 394 msleep(50); 395 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]); 396 if ((stat & BUSY_STAT) == 0) 397 return 0; 398 } while (time_before(jiffies, timeout)); 399 400 return 1; 401} 402 403/** 404 * do_probe - probe an IDE device 405 * @drive: drive to probe 406 * @cmd: command to use 407 * 408 * do_probe() has the difficult job of finding a drive if it exists, 409 * without getting hung up if it doesn't exist, without trampling on 410 * ethernet cards, and without leaving any IRQs dangling to haunt us later. 411 * 412 * If a drive is "known" to exist (from CMOS or kernel parameters), 413 * but does not respond right away, the probe will "hang in there" 414 * for the maximum wait time (about 30 seconds), otherwise it will 415 * exit much more quickly. 416 * 417 * Returns: 0 device was identified 418 * 1 device timed-out (no response to identify request) 419 * 2 device aborted the command (refused to identify itself) 420 * 3 bad status from device (possible for ATAPI drives) 421 * 4 probe was not attempted because failure was obvious 422 */ 423 424static int do_probe (ide_drive_t *drive, u8 cmd) 425{ 426 int rc; 427 ide_hwif_t *hwif = HWIF(drive); 428 429 if (drive->present) { 430 /* avoid waiting for inappropriate probes */ 431 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY)) 432 return 4; 433 } 434#ifdef DEBUG 435 printk("probing for %s: present=%d, media=%d, probetype=%s\n", 436 drive->name, drive->present, drive->media, 437 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI"); 438#endif 439 440 /* needed for some systems 441 * (e.g. crw9624 as drive0 with disk as slave) 442 */ 443 msleep(50); 444 SELECT_DRIVE(drive); 445 msleep(50); 446 if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) { 447 if (drive->select.b.unit != 0) { 448 /* exit with drive0 selected */ 449 SELECT_DRIVE(&hwif->drives[0]); 450 /* allow BUSY_STAT to assert & clear */ 451 msleep(50); 452 } 453 /* no i/f present: mmm.. this should be a 4 -ml */ 454 return 3; 455 } 456 457 if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) || 458 drive->present || cmd == WIN_PIDENTIFY) { 459 /* send cmd and wait */ 460 if ((rc = try_to_identify(drive, cmd))) { 461 /* failed: try again */ 462 rc = try_to_identify(drive,cmd); 463 } 464 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT)) 465 return 4; 466 467 if ((rc == 1 && cmd == WIN_PIDENTIFY) && 468 ((drive->autotune == IDE_TUNE_DEFAULT) || 469 (drive->autotune == IDE_TUNE_AUTO))) { 470 printk("%s: no response (status = 0x%02x), " 471 "resetting drive\n", drive->name, 472 hwif->INB(IDE_STATUS_REG)); 473 msleep(50); 474 hwif->OUTB(drive->select.all, IDE_SELECT_REG); 475 msleep(50); 476 hwif->OUTB(WIN_SRST, IDE_COMMAND_REG); 477 (void)ide_busy_sleep(hwif); 478 rc = try_to_identify(drive, cmd); 479 } 480 if (rc == 1) 481 printk("%s: no response (status = 0x%02x)\n", 482 drive->name, hwif->INB(IDE_STATUS_REG)); 483 /* ensure drive irq is clear */ 484 (void) hwif->INB(IDE_STATUS_REG); 485 } else { 486 /* not present or maybe ATAPI */ 487 rc = 3; 488 } 489 if (drive->select.b.unit != 0) { 490 /* exit with drive0 selected */ 491 SELECT_DRIVE(&hwif->drives[0]); 492 msleep(50); 493 /* ensure drive irq is clear */ 494 (void) hwif->INB(IDE_STATUS_REG); 495 } 496 return rc; 497} 498 499/* 500 * 501 */ 502static void enable_nest (ide_drive_t *drive) 503{ 504 ide_hwif_t *hwif = HWIF(drive); 505 506 printk("%s: enabling %s -- ", hwif->name, drive->id->model); 507 SELECT_DRIVE(drive); 508 msleep(50); 509 hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG); 510 511 if (ide_busy_sleep(hwif)) { 512 printk(KERN_CONT "failed (timeout)\n"); 513 return; 514 } 515 516 msleep(50); 517 518 if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) { 519 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG)); 520 } else { 521 printk("success\n"); 522 } 523 524 /* if !(success||timed-out) */ 525 if (do_probe(drive, WIN_IDENTIFY) >= 2) { 526 /* look for ATAPI device */ 527 (void) do_probe(drive, WIN_PIDENTIFY); 528 } 529} 530 531/** 532 * probe_for_drives - upper level drive probe 533 * @drive: drive to probe for 534 * 535 * probe_for_drive() tests for existence of a given drive using do_probe() 536 * and presents things to the user as needed. 537 * 538 * Returns: 0 no device was found 539 * 1 device was found (note: drive->present might 540 * still be 0) 541 */ 542 543static inline u8 probe_for_drive (ide_drive_t *drive) 544{ 545 /* 546 * In order to keep things simple we have an id 547 * block for all drives at all times. If the device 548 * is pre ATA or refuses ATA/ATAPI identify we 549 * will add faked data to this. 550 * 551 * Also note that 0 everywhere means "can't do X" 552 */ 553 554 drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL); 555 drive->id_read = 0; 556 if(drive->id == NULL) 557 { 558 printk(KERN_ERR "ide: out of memory for id data.\n"); 559 return 0; 560 } 561 strcpy(drive->id->model, "UNKNOWN"); 562 563 /* skip probing? */ 564 if (!drive->noprobe) 565 { 566 /* if !(success||timed-out) */ 567 if (do_probe(drive, WIN_IDENTIFY) >= 2) { 568 /* look for ATAPI device */ 569 (void) do_probe(drive, WIN_PIDENTIFY); 570 } 571 if (!drive->present) 572 /* drive not found */ 573 return 0; 574 if (strstr(drive->id->model, "E X A B Y T E N E S T")) 575 enable_nest(drive); 576 577 /* identification failed? */ 578 if (!drive->id_read) { 579 if (drive->media == ide_disk) { 580 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n", 581 drive->name, drive->cyl, 582 drive->head, drive->sect); 583 } else if (drive->media == ide_cdrom) { 584 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name); 585 } else { 586 /* nuke it */ 587 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name); 588 drive->present = 0; 589 } 590 } 591 /* drive was found */ 592 } 593 if(!drive->present) 594 return 0; 595 /* The drive wasn't being helpful. Add generic info only */ 596 if (drive->id_read == 0) { 597 generic_id(drive); 598 return 1; 599 } 600 601 if (drive->media == ide_disk) { 602 ide_disk_init_chs(drive); 603 ide_disk_init_mult_count(drive); 604 } 605 606 return drive->present; 607} 608 609static void hwif_release_dev (struct device *dev) 610{ 611 ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev); 612 613 complete(&hwif->gendev_rel_comp); 614} 615 616static void ide_register_port(ide_hwif_t *hwif) 617{ 618 int ret; 619 620 /* register with global device tree */ 621 strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE); 622 hwif->gendev.driver_data = hwif; 623 if (hwif->gendev.parent == NULL) { 624 if (hwif->dev) 625 hwif->gendev.parent = hwif->dev; 626 else 627 /* Would like to do = &device_legacy */ 628 hwif->gendev.parent = NULL; 629 } 630 hwif->gendev.release = hwif_release_dev; 631 ret = device_register(&hwif->gendev); 632 if (ret < 0) 633 printk(KERN_WARNING "IDE: %s: device_register error: %d\n", 634 __FUNCTION__, ret); 635} 636 637/** 638 * ide_port_wait_ready - wait for port to become ready 639 * @hwif: IDE port 640 * 641 * This is needed on some PPCs and a bunch of BIOS-less embedded 642 * platforms. Typical cases are: 643 * 644 * - The firmware hard reset the disk before booting the kernel, 645 * the drive is still doing it's poweron-reset sequence, that 646 * can take up to 30 seconds. 647 * 648 * - The firmware does nothing (or no firmware), the device is 649 * still in POST state (same as above actually). 650 * 651 * - Some CD/DVD/Writer combo drives tend to drive the bus during 652 * their reset sequence even when they are non-selected slave 653 * devices, thus preventing discovery of the main HD. 654 * 655 * Doing this wait-for-non-busy should not harm any existing 656 * configuration and fix some issues like the above. 657 * 658 * BenH. 659 * 660 * Returns 0 on success, error code (< 0) otherwise. 661 */ 662 663static int ide_port_wait_ready(ide_hwif_t *hwif) 664{ 665 int unit, rc; 666 667 printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name); 668 669 /* Let HW settle down a bit from whatever init state we 670 * come from */ 671 mdelay(2); 672 673 /* Wait for BSY bit to go away, spec timeout is 30 seconds, 674 * I know of at least one disk who takes 31 seconds, I use 35 675 * here to be safe 676 */ 677 rc = ide_wait_not_busy(hwif, 35000); 678 if (rc) 679 return rc; 680 681 /* Now make sure both master & slave are ready */ 682 for (unit = 0; unit < MAX_DRIVES; unit++) { 683 ide_drive_t *drive = &hwif->drives[unit]; 684 685 /* Ignore disks that we will not probe for later. */ 686 if (!drive->noprobe || drive->present) { 687 SELECT_DRIVE(drive); 688 ide_set_irq(drive, 1); 689 mdelay(2); 690 rc = ide_wait_not_busy(hwif, 35000); 691 if (rc) 692 goto out; 693 } else 694 printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n", 695 drive->name); 696 } 697out: 698 /* Exit function with master reselected (let's be sane) */ 699 if (unit) 700 SELECT_DRIVE(&hwif->drives[0]); 701 702 return rc; 703} 704 705/** 706 * ide_undecoded_slave - look for bad CF adapters 707 * @drive1: drive 708 * 709 * Analyse the drives on the interface and attempt to decide if we 710 * have the same drive viewed twice. This occurs with crap CF adapters 711 * and PCMCIA sometimes. 712 */ 713 714void ide_undecoded_slave(ide_drive_t *drive1) 715{ 716 ide_drive_t *drive0 = &drive1->hwif->drives[0]; 717 718 if ((drive1->dn & 1) == 0 || drive0->present == 0) 719 return; 720 721 /* If the models don't match they are not the same product */ 722 if (strcmp(drive0->id->model, drive1->id->model)) 723 return; 724 725 /* Serial numbers do not match */ 726 if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20)) 727 return; 728 729 /* No serial number, thankfully very rare for CF */ 730 if (drive0->id->serial_no[0] == 0) 731 return; 732 733 /* Appears to be an IDE flash adapter with decode bugs */ 734 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n"); 735 736 drive1->present = 0; 737} 738 739EXPORT_SYMBOL_GPL(ide_undecoded_slave); 740 741static int ide_probe_port(ide_hwif_t *hwif) 742{ 743 unsigned long flags; 744 unsigned int irqd; 745 int unit, rc = -ENODEV; 746 747 BUG_ON(hwif->present); 748 749 if (hwif->noprobe) 750 return -EACCES; 751 752 /* 753 * We must always disable IRQ, as probe_for_drive will assert IRQ, but 754 * we'll install our IRQ driver much later... 755 */ 756 irqd = hwif->irq; 757 if (irqd) 758 disable_irq(hwif->irq); 759 760 local_irq_set(flags); 761 762 if (ide_port_wait_ready(hwif) == -EBUSY) 763 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name); 764 765 /* 766 * Need to probe slave device first to make it release PDIAG-. 767 */ 768 for (unit = MAX_DRIVES - 1; unit >= 0; unit--) { 769 ide_drive_t *drive = &hwif->drives[unit]; 770 drive->dn = (hwif->channel ? 2 : 0) + unit; 771 (void) probe_for_drive(drive); 772 if (drive->present) 773 rc = 0; 774 } 775 if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) { 776 printk(KERN_WARNING "%s: reset\n", hwif->name); 777 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]); 778 udelay(10); 779 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]); 780 (void)ide_busy_sleep(hwif); 781 } 782 local_irq_restore(flags); 783 /* 784 * Use cached IRQ number. It might be (and is...) changed by probe 785 * code above 786 */ 787 if (irqd) 788 enable_irq(irqd); 789 790 return rc; 791} 792 793static void ide_port_tune_devices(ide_hwif_t *hwif) 794{ 795 int unit; 796 797 for (unit = 0; unit < MAX_DRIVES; unit++) { 798 ide_drive_t *drive = &hwif->drives[unit]; 799 800 if (drive->present && hwif->quirkproc) 801 hwif->quirkproc(drive); 802 } 803 804 for (unit = 0; unit < MAX_DRIVES; ++unit) { 805 ide_drive_t *drive = &hwif->drives[unit]; 806 807 if (drive->present) { 808 if (drive->autotune == IDE_TUNE_AUTO) 809 ide_set_max_pio(drive); 810 811 if (drive->autotune != IDE_TUNE_DEFAULT && 812 drive->autotune != IDE_TUNE_AUTO) 813 continue; 814 815 drive->nice1 = 1; 816 817 if (hwif->dma_host_set) 818 ide_set_dma(drive); 819 } 820 } 821 822 for (unit = 0; unit < MAX_DRIVES; ++unit) { 823 ide_drive_t *drive = &hwif->drives[unit]; 824 825 if (hwif->no_io_32bit) 826 drive->no_io_32bit = 1; 827 else 828 drive->no_io_32bit = drive->id->dword_io ? 1 : 0; 829 } 830} 831 832#if MAX_HWIFS > 1 833/* 834 * save_match() is used to simplify logic in init_irq() below. 835 * 836 * A loophole here is that we may not know about a particular 837 * hwif's irq until after that hwif is actually probed/initialized.. 838 * This could be a problem for the case where an hwif is on a 839 * dual interface that requires serialization (eg. cmd640) and another 840 * hwif using one of the same irqs is initialized beforehand. 841 * 842 * This routine detects and reports such situations, but does not fix them. 843 */ 844static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match) 845{ 846 ide_hwif_t *m = *match; 847 848 if (m && m->hwgroup && m->hwgroup != new->hwgroup) { 849 if (!new->hwgroup) 850 return; 851 printk("%s: potential irq problem with %s and %s\n", 852 hwif->name, new->name, m->name); 853 } 854 if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */ 855 *match = new; 856} 857#endif /* MAX_HWIFS > 1 */ 858 859/* 860 * init request queue 861 */ 862static int ide_init_queue(ide_drive_t *drive) 863{ 864 struct request_queue *q; 865 ide_hwif_t *hwif = HWIF(drive); 866 int max_sectors = 256; 867 int max_sg_entries = PRD_ENTRIES; 868 869 /* 870 * Our default set up assumes the normal IDE case, 871 * that is 64K segmenting, standard PRD setup 872 * and LBA28. Some drivers then impose their own 873 * limits and LBA48 we could raise it but as yet 874 * do not. 875 */ 876 877 q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif)); 878 if (!q) 879 return 1; 880 881 q->queuedata = drive; 882 blk_queue_segment_boundary(q, 0xffff); 883 884 if (!hwif->rqsize) { 885 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) || 886 (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA)) 887 hwif->rqsize = 256; 888 else 889 hwif->rqsize = 65536; 890 } 891 if (hwif->rqsize < max_sectors) 892 max_sectors = hwif->rqsize; 893 blk_queue_max_sectors(q, max_sectors); 894 895#ifdef CONFIG_PCI 896 /* When we have an IOMMU, we may have a problem where pci_map_sg() 897 * creates segments that don't completely match our boundary 898 * requirements and thus need to be broken up again. Because it 899 * doesn't align properly either, we may actually have to break up 900 * to more segments than what was we got in the first place, a max 901 * worst case is twice as many. 902 * This will be fixed once we teach pci_map_sg() about our boundary 903 * requirements, hopefully soon. *FIXME* 904 */ 905 if (!PCI_DMA_BUS_IS_PHYS) 906 max_sg_entries >>= 1; 907#endif /* CONFIG_PCI */ 908 909 blk_queue_max_hw_segments(q, max_sg_entries); 910 blk_queue_max_phys_segments(q, max_sg_entries); 911 912 /* assign drive queue */ 913 drive->queue = q; 914 915 /* needs drive->queue to be set */ 916 ide_toggle_bounce(drive, 1); 917 918 return 0; 919} 920 921/* 922 * This routine sets up the irq for an ide interface, and creates a new 923 * hwgroup for the irq/hwif if none was previously assigned. 924 * 925 * Much of the code is for correctly detecting/handling irq sharing 926 * and irq serialization situations. This is somewhat complex because 927 * it handles static as well as dynamic (PCMCIA) IDE interfaces. 928 */ 929static int init_irq (ide_hwif_t *hwif) 930{ 931 unsigned int index; 932 ide_hwgroup_t *hwgroup; 933 ide_hwif_t *match = NULL; 934 935 936 BUG_ON(in_interrupt()); 937 BUG_ON(irqs_disabled()); 938 BUG_ON(hwif == NULL); 939 940 mutex_lock(&ide_cfg_mtx); 941 hwif->hwgroup = NULL; 942#if MAX_HWIFS > 1 943 /* 944 * Group up with any other hwifs that share our irq(s). 945 */ 946 for (index = 0; index < MAX_HWIFS; index++) { 947 ide_hwif_t *h = &ide_hwifs[index]; 948 if (h->hwgroup) { /* scan only initialized hwif's */ 949 if (hwif->irq == h->irq) { 950 hwif->sharing_irq = h->sharing_irq = 1; 951 if (hwif->chipset != ide_pci || 952 h->chipset != ide_pci) { 953 save_match(hwif, h, &match); 954 } 955 } 956 if (hwif->serialized) { 957 if (hwif->mate && hwif->mate->irq == h->irq) 958 save_match(hwif, h, &match); 959 } 960 if (h->serialized) { 961 if (h->mate && hwif->irq == h->mate->irq) 962 save_match(hwif, h, &match); 963 } 964 } 965 } 966#endif /* MAX_HWIFS > 1 */ 967 /* 968 * If we are still without a hwgroup, then form a new one 969 */ 970 if (match) { 971 hwgroup = match->hwgroup; 972 hwif->hwgroup = hwgroup; 973 /* 974 * Link us into the hwgroup. 975 * This must be done early, do ensure that unexpected_intr 976 * can find the hwif and prevent irq storms. 977 * No drives are attached to the new hwif, choose_drive 978 * can't do anything stupid (yet). 979 * Add ourself as the 2nd entry to the hwgroup->hwif 980 * linked list, the first entry is the hwif that owns 981 * hwgroup->handler - do not change that. 982 */ 983 spin_lock_irq(&ide_lock); 984 hwif->next = hwgroup->hwif->next; 985 hwgroup->hwif->next = hwif; 986 BUG_ON(hwif->next == hwif); 987 spin_unlock_irq(&ide_lock); 988 } else { 989 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO, 990 hwif_to_node(hwif)); 991 if (hwgroup == NULL) 992 goto out_up; 993 994 hwif->hwgroup = hwgroup; 995 hwgroup->hwif = hwif->next = hwif; 996 997 init_timer(&hwgroup->timer); 998 hwgroup->timer.function = &ide_timer_expiry; 999 hwgroup->timer.data = (unsigned long) hwgroup; 1000 } 1001 1002 /* 1003 * Allocate the irq, if not already obtained for another hwif 1004 */ 1005 if (!match || match->irq != hwif->irq) { 1006 int sa = 0; 1007#if defined(__mc68000__) || defined(CONFIG_APUS) 1008 sa = IRQF_SHARED; 1009#endif /* __mc68000__ || CONFIG_APUS */ 1010 1011 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) 1012 sa = IRQF_SHARED; 1013 1014 if (hwif->io_ports[IDE_CONTROL_OFFSET]) 1015 /* clear nIEN */ 1016 hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]); 1017 1018 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup)) 1019 goto out_unlink; 1020 } 1021 1022 /* 1023 * For any present drive: 1024 * - allocate the block device queue 1025 * - link drive into the hwgroup 1026 */ 1027 for (index = 0; index < MAX_DRIVES; ++index) { 1028 ide_drive_t *drive = &hwif->drives[index]; 1029 if (!drive->present) 1030 continue; 1031 if (ide_init_queue(drive)) { 1032 printk(KERN_ERR "ide: failed to init %s\n",drive->name); 1033 continue; 1034 } 1035 spin_lock_irq(&ide_lock); 1036 if (!hwgroup->drive) { 1037 /* first drive for hwgroup. */ 1038 drive->next = drive; 1039 hwgroup->drive = drive; 1040 hwgroup->hwif = HWIF(hwgroup->drive); 1041 } else { 1042 drive->next = hwgroup->drive->next; 1043 hwgroup->drive->next = drive; 1044 } 1045 spin_unlock_irq(&ide_lock); 1046 } 1047 1048#if !defined(__mc68000__) && !defined(CONFIG_APUS) 1049 printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name, 1050 hwif->io_ports[IDE_DATA_OFFSET], 1051 hwif->io_ports[IDE_DATA_OFFSET]+7, 1052 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq); 1053#else 1054 printk("%s at 0x%08lx on irq %d", hwif->name, 1055 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq); 1056#endif /* __mc68000__ && CONFIG_APUS */ 1057 if (match) 1058 printk(" (%sed with %s)", 1059 hwif->sharing_irq ? "shar" : "serializ", match->name); 1060 printk("\n"); 1061 mutex_unlock(&ide_cfg_mtx); 1062 return 0; 1063out_unlink: 1064 ide_remove_port_from_hwgroup(hwif); 1065out_up: 1066 mutex_unlock(&ide_cfg_mtx); 1067 return 1; 1068} 1069 1070static int ata_lock(dev_t dev, void *data) 1071{ 1072 /* FIXME: we want to pin hwif down */ 1073 return 0; 1074} 1075 1076static struct kobject *ata_probe(dev_t dev, int *part, void *data) 1077{ 1078 ide_hwif_t *hwif = data; 1079 int unit = *part >> PARTN_BITS; 1080 ide_drive_t *drive = &hwif->drives[unit]; 1081 if (!drive->present) 1082 return NULL; 1083 1084 if (drive->media == ide_disk) 1085 request_module("ide-disk"); 1086 if (drive->scsi) 1087 request_module("ide-scsi"); 1088 if (drive->media == ide_cdrom || drive->media == ide_optical) 1089 request_module("ide-cd"); 1090 if (drive->media == ide_tape) 1091 request_module("ide-tape"); 1092 if (drive->media == ide_floppy) 1093 request_module("ide-floppy"); 1094 1095 return NULL; 1096} 1097 1098static struct kobject *exact_match(dev_t dev, int *part, void *data) 1099{ 1100 struct gendisk *p = data; 1101 *part &= (1 << PARTN_BITS) - 1; 1102 return &p->dev.kobj; 1103} 1104 1105static int exact_lock(dev_t dev, void *data) 1106{ 1107 struct gendisk *p = data; 1108 1109 if (!get_disk(p)) 1110 return -1; 1111 return 0; 1112} 1113 1114void ide_register_region(struct gendisk *disk) 1115{ 1116 blk_register_region(MKDEV(disk->major, disk->first_minor), 1117 disk->minors, NULL, exact_match, exact_lock, disk); 1118} 1119 1120EXPORT_SYMBOL_GPL(ide_register_region); 1121 1122void ide_unregister_region(struct gendisk *disk) 1123{ 1124 blk_unregister_region(MKDEV(disk->major, disk->first_minor), 1125 disk->minors); 1126} 1127 1128EXPORT_SYMBOL_GPL(ide_unregister_region); 1129 1130void ide_init_disk(struct gendisk *disk, ide_drive_t *drive) 1131{ 1132 ide_hwif_t *hwif = drive->hwif; 1133 unsigned int unit = (drive->select.all >> 4) & 1; 1134 1135 disk->major = hwif->major; 1136 disk->first_minor = unit << PARTN_BITS; 1137 sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit); 1138 disk->queue = drive->queue; 1139} 1140 1141EXPORT_SYMBOL_GPL(ide_init_disk); 1142 1143static void ide_remove_drive_from_hwgroup(ide_drive_t *drive) 1144{ 1145 ide_hwgroup_t *hwgroup = drive->hwif->hwgroup; 1146 1147 if (drive == drive->next) { 1148 /* special case: last drive from hwgroup. */ 1149 BUG_ON(hwgroup->drive != drive); 1150 hwgroup->drive = NULL; 1151 } else { 1152 ide_drive_t *walk; 1153 1154 walk = hwgroup->drive; 1155 while (walk->next != drive) 1156 walk = walk->next; 1157 walk->next = drive->next; 1158 if (hwgroup->drive == drive) { 1159 hwgroup->drive = drive->next; 1160 hwgroup->hwif = hwgroup->drive->hwif; 1161 } 1162 } 1163 BUG_ON(hwgroup->drive == drive); 1164} 1165 1166static void drive_release_dev (struct device *dev) 1167{ 1168 ide_drive_t *drive = container_of(dev, ide_drive_t, gendev); 1169 1170 spin_lock_irq(&ide_lock); 1171 ide_remove_drive_from_hwgroup(drive); 1172 kfree(drive->id); 1173 drive->id = NULL; 1174 drive->present = 0; 1175 /* Messed up locking ... */ 1176 spin_unlock_irq(&ide_lock); 1177 blk_cleanup_queue(drive->queue); 1178 spin_lock_irq(&ide_lock); 1179 drive->queue = NULL; 1180 spin_unlock_irq(&ide_lock); 1181 1182 complete(&drive->gendev_rel_comp); 1183} 1184 1185/* 1186 * init_gendisk() (as opposed to ide_geninit) is called for each major device, 1187 * after probing for drives, to allocate partition tables and other data 1188 * structures needed for the routines in genhd.c. ide_geninit() gets called 1189 * somewhat later, during the partition check. 1190 */ 1191static void init_gendisk (ide_hwif_t *hwif) 1192{ 1193 unsigned int unit; 1194 1195 for (unit = 0; unit < MAX_DRIVES; ++unit) { 1196 ide_drive_t * drive = &hwif->drives[unit]; 1197 ide_add_generic_settings(drive); 1198 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u", 1199 hwif->index,unit); 1200 drive->gendev.parent = &hwif->gendev; 1201 drive->gendev.bus = &ide_bus_type; 1202 drive->gendev.driver_data = drive; 1203 drive->gendev.release = drive_release_dev; 1204 } 1205 blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS, 1206 THIS_MODULE, ata_probe, ata_lock, hwif); 1207} 1208 1209static int hwif_init(ide_hwif_t *hwif) 1210{ 1211 int old_irq; 1212 1213 if (!hwif->irq) { 1214 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) 1215 { 1216 printk("%s: DISABLED, NO IRQ\n", hwif->name); 1217 return 0; 1218 } 1219 } 1220#ifdef CONFIG_BLK_DEV_HD 1221 if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) { 1222 printk("%s: CANNOT SHARE IRQ WITH OLD " 1223 "HARDDISK DRIVER (hd.c)\n", hwif->name); 1224 return 0; 1225 } 1226#endif /* CONFIG_BLK_DEV_HD */ 1227 1228 if (register_blkdev(hwif->major, hwif->name)) 1229 return 0; 1230 1231 if (!hwif->sg_max_nents) 1232 hwif->sg_max_nents = PRD_ENTRIES; 1233 1234 hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents, 1235 GFP_KERNEL); 1236 if (!hwif->sg_table) { 1237 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name); 1238 goto out; 1239 } 1240 1241 sg_init_table(hwif->sg_table, hwif->sg_max_nents); 1242 1243 if (init_irq(hwif) == 0) 1244 goto done; 1245 1246 old_irq = hwif->irq; 1247 /* 1248 * It failed to initialise. Find the default IRQ for 1249 * this port and try that. 1250 */ 1251 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) { 1252 printk("%s: Disabled unable to get IRQ %d.\n", 1253 hwif->name, old_irq); 1254 goto out; 1255 } 1256 if (init_irq(hwif)) { 1257 printk("%s: probed IRQ %d and default IRQ %d failed.\n", 1258 hwif->name, old_irq, hwif->irq); 1259 goto out; 1260 } 1261 printk("%s: probed IRQ %d failed, using default.\n", 1262 hwif->name, hwif->irq); 1263 1264done: 1265 init_gendisk(hwif); 1266 ide_acpi_init(hwif); 1267 return 1; 1268 1269out: 1270 unregister_blkdev(hwif->major, hwif->name); 1271 return 0; 1272} 1273 1274static void hwif_register_devices(ide_hwif_t *hwif) 1275{ 1276 unsigned int i; 1277 1278 for (i = 0; i < MAX_DRIVES; i++) { 1279 ide_drive_t *drive = &hwif->drives[i]; 1280 1281 if (drive->present) { 1282 int ret = device_register(&drive->gendev); 1283 1284 if (ret < 0) 1285 printk(KERN_WARNING "IDE: %s: " 1286 "device_register error: %d\n", 1287 __FUNCTION__, ret); 1288 } 1289 } 1290} 1291 1292int ide_device_add_all(u8 *idx) 1293{ 1294 ide_hwif_t *hwif; 1295 int i, rc = 0; 1296 1297 for (i = 0; i < MAX_HWIFS; i++) { 1298 if (idx[i] == 0xff) 1299 continue; 1300 1301 hwif = &ide_hwifs[idx[i]]; 1302 1303 if ((hwif->chipset != ide_4drives || !hwif->mate || 1304 !hwif->mate->present) && ide_hwif_request_regions(hwif)) { 1305 printk(KERN_ERR "%s: ports already in use, " 1306 "skipping probe\n", hwif->name); 1307 continue; 1308 } 1309 1310 if (ide_probe_port(hwif) < 0) { 1311 ide_hwif_release_regions(hwif); 1312 continue; 1313 } 1314 1315 hwif->present = 1; 1316 1317 if (hwif->chipset != ide_4drives || !hwif->mate || 1318 !hwif->mate->present) 1319 ide_register_port(hwif); 1320 1321 ide_port_tune_devices(hwif); 1322 } 1323 1324 for (i = 0; i < MAX_HWIFS; i++) { 1325 if (idx[i] == 0xff) 1326 continue; 1327 1328 hwif = &ide_hwifs[idx[i]]; 1329 1330 if (!hwif->present) 1331 continue; 1332 1333 if (hwif_init(hwif) == 0) { 1334 printk(KERN_INFO "%s: failed to initialize IDE " 1335 "interface\n", hwif->name); 1336 hwif->present = 0; 1337 rc = -1; 1338 continue; 1339 } 1340 } 1341 1342 for (i = 0; i < MAX_HWIFS; i++) { 1343 if (idx[i] == 0xff) 1344 continue; 1345 1346 hwif = &ide_hwifs[idx[i]]; 1347 1348 if (hwif->present) { 1349 if (hwif->chipset == ide_unknown || 1350 hwif->chipset == ide_forced) 1351 hwif->chipset = ide_generic; 1352 hwif_register_devices(hwif); 1353 } 1354 } 1355 1356 for (i = 0; i < MAX_HWIFS; i++) { 1357 if (idx[i] != 0xff) 1358 ide_proc_register_port(&ide_hwifs[idx[i]]); 1359 } 1360 1361 return rc; 1362} 1363EXPORT_SYMBOL_GPL(ide_device_add_all); 1364 1365int ide_device_add(u8 idx[4]) 1366{ 1367 u8 idx_all[MAX_HWIFS]; 1368 int i; 1369 1370 for (i = 0; i < MAX_HWIFS; i++) 1371 idx_all[i] = (i < 4) ? idx[i] : 0xff; 1372 1373 return ide_device_add_all(idx_all); 1374} 1375EXPORT_SYMBOL_GPL(ide_device_add); 1376