err.no Git - linux-2.6/blob - drivers/ide/ide-probe.c

   1 /*
   2  *  linux/drivers/ide/ide-probe.c       Version 1.11    Mar 05, 2003
   3  *
   4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5  */
   6
   7 /*
   8  *  Mostly written by Mark Lord <mlord@pobox.com>
   9  *                and Gadi Oxman <gadio@netvision.net.il>
  10  *                and Andre Hedrick <andre@linux-ide.org>
  11  *
  12  *  See linux/MAINTAINERS for address of current maintainer.
  13  *
  14  * This is the IDE probe module, as evolved from hd.c and ide.c.
  15  *
  16  * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  17  *       by Andrea Arcangeli
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/string.h>
  23 #include <linux/kernel.h>
  24 #include <linux/timer.h>
  25 #include <linux/mm.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/major.h>
  28 #include <linux/errno.h>
  29 #include <linux/genhd.h>
  30 #include <linux/slab.h>
  31 #include <linux/delay.h>
  32 #include <linux/ide.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/kmod.h>
  35 #include <linux/pci.h>
  36 #include <linux/scatterlist.h>
  37
  38 #include <asm/byteorder.h>
  39 #include <asm/irq.h>
  40 #include <asm/uaccess.h>
  41 #include <asm/io.h>
  42
  43 /**
  44  *      generic_id              -       add a generic drive id
  45  *      @drive: drive to make an ID block for
  46  *
  47  *      Add a fake id field to the drive we are passed. This allows
  48  *      use to skip a ton of NULL checks (which people always miss)
  49  *      and make drive properties unconditional outside of this file
  50  */
  51
  52 static void generic_id(ide_drive_t *drive)
  53 {
  54         drive->id->cyls = drive->cyl;
  55         drive->id->heads = drive->head;
  56         drive->id->sectors = drive->sect;
  57         drive->id->cur_cyls = drive->cyl;
  58         drive->id->cur_heads = drive->head;
  59         drive->id->cur_sectors = drive->sect;
  60 }
  61
  62 static void ide_disk_init_chs(ide_drive_t *drive)
  63 {
  64         struct hd_driveid *id = drive->id;
  65
  66         /* Extract geometry if we did not already have one for the drive */
  67         if (!drive->cyl || !drive->head || !drive->sect) {
  68                 drive->cyl  = drive->bios_cyl  = id->cyls;
  69                 drive->head = drive->bios_head = id->heads;
  70                 drive->sect = drive->bios_sect = id->sectors;
  71         }
  72
  73         /* Handle logical geometry translation by the drive */
  74         if ((id->field_valid & 1) && id->cur_cyls &&
  75             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
  76                 drive->cyl  = id->cur_cyls;
  77                 drive->head = id->cur_heads;
  78                 drive->sect = id->cur_sectors;
  79         }
  80
  81         /* Use physical geometry if what we have still makes no sense */
  82         if (drive->head > 16 && id->heads && id->heads <= 16) {
  83                 drive->cyl  = id->cyls;
  84                 drive->head = id->heads;
  85                 drive->sect = id->sectors;
  86         }
  87 }
  88
  89 static void ide_disk_init_mult_count(ide_drive_t *drive)
  90 {
  91         struct hd_driveid *id = drive->id;
  92
  93         drive->mult_count = 0;
  94         if (id->max_multsect) {
  95 #ifdef CONFIG_IDEDISK_MULTI_MODE
  96                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
  97                 id->multsect_valid = id->multsect ? 1 : 0;
  98                 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
  99                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
 100 #else   /* original, pre IDE-NFG, per request of AC */
 101                 drive->mult_req = 0;
 102                 if (drive->mult_req > id->max_multsect)
 103                         drive->mult_req = id->max_multsect;
 104                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
 105                         drive->special.b.set_multmode = 1;
 106 #endif
 107         }
 108 }
 109
 110 /**
 111  *      do_identify     -       identify a drive
 112  *      @drive: drive to identify
 113  *      @cmd: command used
 114  *
 115  *      Called when we have issued a drive identify command to
 116  *      read and parse the results. This function is run with
 117  *      interrupts disabled.
 118  */
 119
 120 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 121 {
 122         ide_hwif_t *hwif = HWIF(drive);
 123         int bswap = 1;
 124         struct hd_driveid *id;
 125
 126         id = drive->id;
 127         /* read 512 bytes of id info */
 128         hwif->ata_input_data(drive, id, SECTOR_WORDS);
 129
 130         drive->id_read = 1;
 131         local_irq_enable();
 132 #ifdef DEBUG
 133         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 134         ide_dump_identify((u8 *)id);
 135 #endif
 136         ide_fix_driveid(id);
 137
 138 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 139         /*
 140          * EATA SCSI controllers do a hardware ATA emulation:
 141          * Ignore them if there is a driver for them available.
 142          */
 143         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 144             (id->model[0] == 'S' && id->model[1] == 'K')) {
 145                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 146                 goto err_misc;
 147         }
 148 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
 149
 150         /*
 151          *  WIN_IDENTIFY returns little-endian info,
 152          *  WIN_PIDENTIFY *usually* returns little-endian info.
 153          */
 154         if (cmd == WIN_PIDENTIFY) {
 155                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 156                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 157                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 158                         /* Vertos drives may still be weird */
 159                         bswap ^= 1;
 160         }
 161         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 162         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 163         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 164
 165         /* we depend on this a lot! */
 166         id->model[sizeof(id->model)-1] = '\0';
 167
 168         if (strstr(id->model, "E X A B Y T E N E S T"))
 169                 goto err_misc;
 170
 171         printk("%s: %s, ", drive->name, id->model);
 172         drive->present = 1;
 173         drive->dead = 0;
 174
 175         /*
 176          * Check for an ATAPI device
 177          */
 178         if (cmd == WIN_PIDENTIFY) {
 179                 u8 type = (id->config >> 8) & 0x1f;
 180                 printk("ATAPI ");
 181                 switch (type) {
 182                         case ide_floppy:
 183                                 if (!strstr(id->model, "CD-ROM")) {
 184                                         if (!strstr(id->model, "oppy") &&
 185                                             !strstr(id->model, "poyp") &&
 186                                             !strstr(id->model, "ZIP"))
 187                                                 printk("cdrom or floppy?, assuming ");
 188                                         if (drive->media != ide_cdrom) {
 189                                                 printk ("FLOPPY");
 190                                                 drive->removable = 1;
 191                                                 break;
 192                                         }
 193                                 }
 194                                 /* Early cdrom models used zero */
 195                                 type = ide_cdrom;
 196                         case ide_cdrom:
 197                                 drive->removable = 1;
 198 #ifdef CONFIG_PPC
 199                                 /* kludge for Apple PowerBook internal zip */
 200                                 if (!strstr(id->model, "CD-ROM") &&
 201                                     strstr(id->model, "ZIP")) {
 202                                         printk ("FLOPPY");
 203                                         type = ide_floppy;
 204                                         break;
 205                                 }
 206 #endif
 207                                 printk ("CD/DVD-ROM");
 208                                 break;
 209                         case ide_tape:
 210                                 printk ("TAPE");
 211                                 break;
 212                         case ide_optical:
 213                                 printk ("OPTICAL");
 214                                 drive->removable = 1;
 215                                 break;
 216                         default:
 217                                 printk("UNKNOWN (type %d)", type);
 218                                 break;
 219                 }
 220                 printk (" drive\n");
 221                 drive->media = type;
 222                 /* an ATAPI device ignores DRDY */
 223                 drive->ready_stat = 0;
 224                 return;
 225         }
 226
 227         /*
 228          * Not an ATAPI device: looks like a "regular" hard disk
 229          */
 230
 231         /*
 232          * 0x848a = CompactFlash device
 233          * These are *not* removable in Linux definition of the term
 234          */
 235
 236         if ((id->config != 0x848a) && (id->config & (1<<7)))
 237                 drive->removable = 1;
 238
 239         drive->media = ide_disk;
 240         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
 241
 242         return;
 243
 244 err_misc:
 245         kfree(id);
 246         drive->present = 0;
 247         return;
 248 }
 249
 250 /**
 251  *      actual_try_to_identify  -       send ata/atapi identify
 252  *      @drive: drive to identify
 253  *      @cmd: command to use
 254  *
 255  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 256  *      and waits for a response.  It also monitors irqs while this is
 257  *      happening, in hope of automatically determining which one is
 258  *      being used by the interface.
 259  *
 260  *      Returns:        0  device was identified
 261  *                      1  device timed-out (no response to identify request)
 262  *                      2  device aborted the command (refused to identify itself)
 263  */
 264
 265 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 266 {
 267         ide_hwif_t *hwif = HWIF(drive);
 268         int rc;
 269         unsigned long hd_status;
 270         unsigned long timeout;
 271         u8 s = 0, a = 0;
 272
 273         /* take a deep breath */
 274         msleep(50);
 275
 276         if (IDE_CONTROL_REG) {
 277                 a = hwif->INB(IDE_ALTSTATUS_REG);
 278                 s = hwif->INB(IDE_STATUS_REG);
 279                 if ((a ^ s) & ~INDEX_STAT) {
 280                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 281                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 282                         /* ancient Seagate drives, broken interfaces */
 283                         hd_status = IDE_STATUS_REG;
 284                 } else {
 285                         /* use non-intrusive polling */
 286                         hd_status = IDE_ALTSTATUS_REG;
 287                 }
 288         } else
 289                 hd_status = IDE_STATUS_REG;
 290
 291         /* set features register for atapi
 292          * identify command to be sure of reply
 293          */
 294         if ((cmd == WIN_PIDENTIFY))
 295                 /* disable dma & overlap */
 296                 hwif->OUTB(0, IDE_FEATURE_REG);
 297
 298         /* ask drive for ID */
 299         hwif->OUTB(cmd, IDE_COMMAND_REG);
 300
 301         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 302         timeout += jiffies;
 303         do {
 304                 if (time_after(jiffies, timeout)) {
 305                         /* drive timed-out */
 306                         return 1;
 307                 }
 308                 /* give drive a breather */
 309                 msleep(50);
 310         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 311
 312         /* wait for IRQ and DRQ_STAT */
 313         msleep(50);
 314         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 315                 unsigned long flags;
 316
 317                 /* local CPU only; some systems need this */
 318                 local_irq_save(flags);
 319                 /* drive returned ID */
 320                 do_identify(drive, cmd);
 321                 /* drive responded with ID */
 322                 rc = 0;
 323                 /* clear drive IRQ */
 324                 (void) hwif->INB(IDE_STATUS_REG);
 325                 local_irq_restore(flags);
 326         } else {
 327                 /* drive refused ID */
 328                 rc = 2;
 329         }
 330         return rc;
 331 }
 332
 333 /**
 334  *      try_to_identify -       try to identify a drive
 335  *      @drive: drive to probe
 336  *      @cmd: command to use
 337  *
 338  *      Issue the identify command and then do IRQ probing to
 339  *      complete the identification when needed by finding the
 340  *      IRQ the drive is attached to
 341  */
 342
 343 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 344 {
 345         ide_hwif_t *hwif = HWIF(drive);
 346         int retval;
 347         int autoprobe = 0;
 348         unsigned long cookie = 0;
 349
 350         /*
 351          * Disable device irq unless we need to
 352          * probe for it. Otherwise we'll get spurious
 353          * interrupts during the identify-phase that
 354          * the irq handler isn't expecting.
 355          */
 356         if (IDE_CONTROL_REG) {
 357                 if (!hwif->irq) {
 358                         autoprobe = 1;
 359                         cookie = probe_irq_on();
 360                 }
 361                 ide_set_irq(drive, autoprobe);
 362         }
 363
 364         retval = actual_try_to_identify(drive, cmd);
 365
 366         if (autoprobe) {
 367                 int irq;
 368
 369                 ide_set_irq(drive, 0);
 370                 /* clear drive IRQ */
 371                 (void) hwif->INB(IDE_STATUS_REG);
 372                 udelay(5);
 373                 irq = probe_irq_off(cookie);
 374                 if (!hwif->irq) {
 375                         if (irq > 0) {
 376                                 hwif->irq = irq;
 377                         } else {
 378                                 /* Mmmm.. multiple IRQs..
 379                                  * don't know which was ours
 380                                  */
 381                                 printk("%s: IRQ probe failed (0x%lx)\n",
 382                                         drive->name, cookie);
 383                         }
 384                 }
 385         }
 386         return retval;
 387 }
 388
 389 static int ide_busy_sleep(ide_hwif_t *hwif)
 390 {
 391         unsigned long timeout = jiffies + WAIT_WORSTCASE;
 392         u8 stat;
 393
 394         do {
 395                 msleep(50);
 396                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 397                 if ((stat & BUSY_STAT) == 0)
 398                         return 0;
 399         } while (time_before(jiffies, timeout));
 400
 401         return 1;
 402 }
 403
 404 /**
 405  *      do_probe                -       probe an IDE device
 406  *      @drive: drive to probe
 407  *      @cmd: command to use
 408  *
 409  *      do_probe() has the difficult job of finding a drive if it exists,
 410  *      without getting hung up if it doesn't exist, without trampling on
 411  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 412  *
 413  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 414  *      but does not respond right away, the probe will "hang in there"
 415  *      for the maximum wait time (about 30 seconds), otherwise it will
 416  *      exit much more quickly.
 417  *
 418  * Returns:     0  device was identified
 419  *              1  device timed-out (no response to identify request)
 420  *              2  device aborted the command (refused to identify itself)
 421  *              3  bad status from device (possible for ATAPI drives)
 422  *              4  probe was not attempted because failure was obvious
 423  */
 424
 425 static int do_probe (ide_drive_t *drive, u8 cmd)
 426 {
 427         int rc;
 428         ide_hwif_t *hwif = HWIF(drive);
 429
 430         if (drive->present) {
 431                 /* avoid waiting for inappropriate probes */
 432                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 433                         return 4;
 434         }
 435 #ifdef DEBUG
 436         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 437                 drive->name, drive->present, drive->media,
 438                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 439 #endif
 440
 441         /* needed for some systems
 442          * (e.g. crw9624 as drive0 with disk as slave)
 443          */
 444         msleep(50);
 445         SELECT_DRIVE(drive);
 446         msleep(50);
 447         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 448                 if (drive->select.b.unit != 0) {
 449                         /* exit with drive0 selected */
 450                         SELECT_DRIVE(&hwif->drives[0]);
 451                         /* allow BUSY_STAT to assert & clear */
 452                         msleep(50);
 453                 }
 454                 /* no i/f present: mmm.. this should be a 4 -ml */
 455                 return 3;
 456         }
 457
 458         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 459             drive->present || cmd == WIN_PIDENTIFY) {
 460                 /* send cmd and wait */
 461                 if ((rc = try_to_identify(drive, cmd))) {
 462                         /* failed: try again */
 463                         rc = try_to_identify(drive,cmd);
 464                 }
 465                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 466                         return 4;
 467
 468                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 469                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 470                         (drive->autotune == IDE_TUNE_AUTO))) {
 471                         printk("%s: no response (status = 0x%02x), "
 472                                 "resetting drive\n", drive->name,
 473                                 hwif->INB(IDE_STATUS_REG));
 474                         msleep(50);
 475                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 476                         msleep(50);
 477                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 478                         (void)ide_busy_sleep(hwif);
 479                         rc = try_to_identify(drive, cmd);
 480                 }
 481                 if (rc == 1)
 482                         printk("%s: no response (status = 0x%02x)\n",
 483                                 drive->name, hwif->INB(IDE_STATUS_REG));
 484                 /* ensure drive irq is clear */
 485                 (void) hwif->INB(IDE_STATUS_REG);
 486         } else {
 487                 /* not present or maybe ATAPI */
 488                 rc = 3;
 489         }
 490         if (drive->select.b.unit != 0) {
 491                 /* exit with drive0 selected */
 492                 SELECT_DRIVE(&hwif->drives[0]);
 493                 msleep(50);
 494                 /* ensure drive irq is clear */
 495                 (void) hwif->INB(IDE_STATUS_REG);
 496         }
 497         return rc;
 498 }
 499
 500 /*
 501  *
 502  */
 503 static void enable_nest (ide_drive_t *drive)
 504 {
 505         ide_hwif_t *hwif = HWIF(drive);
 506
 507         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 508         SELECT_DRIVE(drive);
 509         msleep(50);
 510         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 511
 512         if (ide_busy_sleep(hwif)) {
 513                 printk(KERN_CONT "failed (timeout)\n");
 514                 return;
 515         }
 516
 517         msleep(50);
 518
 519         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 520                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 521         } else {
 522                 printk("success\n");
 523         }
 524
 525         /* if !(success||timed-out) */
 526         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 527                 /* look for ATAPI device */
 528                 (void) do_probe(drive, WIN_PIDENTIFY);
 529         }
 530 }
 531
 532 /**
 533  *      probe_for_drives        -       upper level drive probe
 534  *      @drive: drive to probe for
 535  *
 536  *      probe_for_drive() tests for existence of a given drive using do_probe()
 537  *      and presents things to the user as needed.
 538  *
 539  *      Returns:        0  no device was found
 540  *                      1  device was found (note: drive->present might
 541  *                         still be 0)
 542  */
 543
 544 static inline u8 probe_for_drive (ide_drive_t *drive)
 545 {
 546         /*
 547          *      In order to keep things simple we have an id
 548          *      block for all drives at all times. If the device
 549          *      is pre ATA or refuses ATA/ATAPI identify we
 550          *      will add faked data to this.
 551          *
 552          *      Also note that 0 everywhere means "can't do X"
 553          */
 554
 555         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 556         drive->id_read = 0;
 557         if(drive->id == NULL)
 558         {
 559                 printk(KERN_ERR "ide: out of memory for id data.\n");
 560                 return 0;
 561         }
 562         strcpy(drive->id->model, "UNKNOWN");
 563
 564         /* skip probing? */
 565         if (!drive->noprobe)
 566         {
 567                 /* if !(success||timed-out) */
 568                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 569                         /* look for ATAPI device */
 570                         (void) do_probe(drive, WIN_PIDENTIFY);
 571                 }
 572                 if (!drive->present)
 573                         /* drive not found */
 574                         return 0;
 575                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 576                         enable_nest(drive);
 577
 578                 /* identification failed? */
 579                 if (!drive->id_read) {
 580                         if (drive->media == ide_disk) {
 581                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 582                                         drive->name, drive->cyl,
 583                                         drive->head, drive->sect);
 584                         } else if (drive->media == ide_cdrom) {
 585                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 586                         } else {
 587                                 /* nuke it */
 588                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 589                                 drive->present = 0;
 590                         }
 591                 }
 592                 /* drive was found */
 593         }
 594         if(!drive->present)
 595                 return 0;
 596         /* The drive wasn't being helpful. Add generic info only */
 597         if (drive->id_read == 0) {
 598                 generic_id(drive);
 599                 return 1;
 600         }
 601
 602         if (drive->media == ide_disk) {
 603                 ide_disk_init_chs(drive);
 604                 ide_disk_init_mult_count(drive);
 605         }
 606
 607         return drive->present;
 608 }
 609
 610 static void hwif_release_dev (struct device *dev)
 611 {
 612         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 613
 614         complete(&hwif->gendev_rel_comp);
 615 }
 616
 617 static void hwif_register (ide_hwif_t *hwif)
 618 {
 619         int ret;
 620
 621         /* register with global device tree */
 622         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 623         hwif->gendev.driver_data = hwif;
 624         if (hwif->gendev.parent == NULL) {
 625                 if (hwif->pci_dev)
 626                         hwif->gendev.parent = &hwif->pci_dev->dev;
 627                 else
 628                         /* Would like to do = &device_legacy */
 629                         hwif->gendev.parent = NULL;
 630         }
 631         hwif->gendev.release = hwif_release_dev;
 632         ret = device_register(&hwif->gendev);
 633         if (ret < 0)
 634                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 635                         __FUNCTION__, ret);
 636 }
 637
 638 static int wait_hwif_ready(ide_hwif_t *hwif)
 639 {
 640         int unit, rc;
 641
 642         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 643
 644         /* Let HW settle down a bit from whatever init state we
 645          * come from */
 646         mdelay(2);
 647
 648         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 649          * I know of at least one disk who takes 31 seconds, I use 35
 650          * here to be safe
 651          */
 652         rc = ide_wait_not_busy(hwif, 35000);
 653         if (rc)
 654                 return rc;
 655
 656         /* Now make sure both master & slave are ready */
 657         for (unit = 0; unit < MAX_DRIVES; unit++) {
 658                 ide_drive_t *drive = &hwif->drives[unit];
 659
 660                 /* Ignore disks that we will not probe for later. */
 661                 if (!drive->noprobe || drive->present) {
 662                         SELECT_DRIVE(drive);
 663                         ide_set_irq(drive, 1);
 664                         mdelay(2);
 665                         rc = ide_wait_not_busy(hwif, 35000);
 666                         if (rc)
 667                                 goto out;
 668                 } else
 669                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 670                                           drive->name);
 671         }
 672 out:
 673         /* Exit function with master reselected (let's be sane) */
 674         if (unit)
 675                 SELECT_DRIVE(&hwif->drives[0]);
 676
 677         return rc;
 678 }
 679
 680 /**
 681  *      ide_undecoded_slave     -       look for bad CF adapters
 682  *      @drive1: drive
 683  *
 684  *      Analyse the drives on the interface and attempt to decide if we
 685  *      have the same drive viewed twice. This occurs with crap CF adapters
 686  *      and PCMCIA sometimes.
 687  */
 688
 689 void ide_undecoded_slave(ide_drive_t *drive1)
 690 {
 691         ide_drive_t *drive0 = &drive1->hwif->drives[0];
 692
 693         if ((drive1->dn & 1) == 0 || drive0->present == 0)
 694                 return;
 695
 696         /* If the models don't match they are not the same product */
 697         if (strcmp(drive0->id->model, drive1->id->model))
 698                 return;
 699
 700         /* Serial numbers do not match */
 701         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 702                 return;
 703
 704         /* No serial number, thankfully very rare for CF */
 705         if (drive0->id->serial_no[0] == 0)
 706                 return;
 707
 708         /* Appears to be an IDE flash adapter with decode bugs */
 709         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 710
 711         drive1->present = 0;
 712 }
 713
 714 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 715
 716 /*
 717  * This routine only knows how to look for drive units 0 and 1
 718  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 719  */
 720 static void probe_hwif(ide_hwif_t *hwif)
 721 {
 722         unsigned long flags;
 723         unsigned int irqd;
 724         int unit;
 725
 726         if (hwif->noprobe)
 727                 return;
 728
 729         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 730             (ide_hwif_request_regions(hwif))) {
 731                 u16 msgout = 0;
 732                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 733                         ide_drive_t *drive = &hwif->drives[unit];
 734                         if (drive->present) {
 735                                 drive->present = 0;
 736                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 737                                         drive->name);
 738                                 msgout = 1;
 739                         }
 740                 }
 741                 if (!msgout)
 742                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 743                                 hwif->name);
 744                 return;
 745         }
 746
 747         /*
 748          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 749          * we'll install our IRQ driver much later...
 750          */
 751         irqd = hwif->irq;
 752         if (irqd)
 753                 disable_irq(hwif->irq);
 754
 755         local_irq_set(flags);
 756
 757         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 758          * platforms. Typical cases are:
 759          *
 760          *  - The firmware hard reset the disk before booting the kernel,
 761          *    the drive is still doing it's poweron-reset sequence, that
 762          *    can take up to 30 seconds
 763          *  - The firmware does nothing (or no firmware), the device is
 764          *    still in POST state (same as above actually).
 765          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 766          *    their reset sequence even when they are non-selected slave
 767          *    devices, thus preventing discovery of the main HD
 768          *
 769          *  Doing this wait-for-busy should not harm any existing configuration
 770          *  (at least things won't be worse than what current code does, that
 771          *  is blindly go & talk to the drive) and fix some issues like the
 772          *  above.
 773          *
 774          *  BenH.
 775          */
 776         if (wait_hwif_ready(hwif) == -EBUSY)
 777                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 778
 779         /*
 780          * Need to probe slave device first to make it release PDIAG-.
 781          */
 782         for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
 783                 ide_drive_t *drive = &hwif->drives[unit];
 784                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 785                 (void) probe_for_drive(drive);
 786                 if (drive->present && !hwif->present) {
 787                         hwif->present = 1;
 788                         if (hwif->chipset != ide_4drives ||
 789                             !hwif->mate ||
 790                             !hwif->mate->present) {
 791                                 hwif_register(hwif);
 792                         }
 793                 }
 794         }
 795         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 796                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 797                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 798                 udelay(10);
 799                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 800                 (void)ide_busy_sleep(hwif);
 801         }
 802         local_irq_restore(flags);
 803         /*
 804          * Use cached IRQ number. It might be (and is...) changed by probe
 805          * code above
 806          */
 807         if (irqd)
 808                 enable_irq(irqd);
 809
 810         if (!hwif->present) {
 811                 ide_hwif_release_regions(hwif);
 812                 return;
 813         }
 814
 815         for (unit = 0; unit < MAX_DRIVES; unit++) {
 816                 ide_drive_t *drive = &hwif->drives[unit];
 817
 818                 if (drive->present && hwif->quirkproc)
 819                         hwif->quirkproc(drive);
 820         }
 821
 822         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 823                 ide_drive_t *drive = &hwif->drives[unit];
 824
 825                 if (drive->present) {
 826                         if (drive->autotune == IDE_TUNE_AUTO)
 827                                 ide_set_max_pio(drive);
 828
 829                         if (drive->autotune != IDE_TUNE_DEFAULT &&
 830                             drive->autotune != IDE_TUNE_AUTO)
 831                                 continue;
 832
 833                         drive->nice1 = 1;
 834
 835                         if (hwif->dma_host_set)
 836                                 ide_set_dma(drive);
 837                 }
 838         }
 839
 840         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 841                 ide_drive_t *drive = &hwif->drives[unit];
 842
 843                 if (hwif->no_io_32bit)
 844                         drive->no_io_32bit = 1;
 845                 else
 846                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 847         }
 848 }
 849
 850 #if MAX_HWIFS > 1
 851 /*
 852  * save_match() is used to simplify logic in init_irq() below.
 853  *
 854  * A loophole here is that we may not know about a particular
 855  * hwif's irq until after that hwif is actually probed/initialized..
 856  * This could be a problem for the case where an hwif is on a
 857  * dual interface that requires serialization (eg. cmd640) and another
 858  * hwif using one of the same irqs is initialized beforehand.
 859  *
 860  * This routine detects and reports such situations, but does not fix them.
 861  */
 862 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 863 {
 864         ide_hwif_t *m = *match;
 865
 866         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 867                 if (!new->hwgroup)
 868                         return;
 869                 printk("%s: potential irq problem with %s and %s\n",
 870                         hwif->name, new->name, m->name);
 871         }
 872         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 873                 *match = new;
 874 }
 875 #endif /* MAX_HWIFS > 1 */
 876
 877 /*
 878  * init request queue
 879  */
 880 static int ide_init_queue(ide_drive_t *drive)
 881 {
 882         struct request_queue *q;
 883         ide_hwif_t *hwif = HWIF(drive);
 884         int max_sectors = 256;
 885         int max_sg_entries = PRD_ENTRIES;
 886
 887         /*
 888          *      Our default set up assumes the normal IDE case,
 889          *      that is 64K segmenting, standard PRD setup
 890          *      and LBA28. Some drivers then impose their own
 891          *      limits and LBA48 we could raise it but as yet
 892          *      do not.
 893          */
 894
 895         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 896         if (!q)
 897                 return 1;
 898
 899         q->queuedata = drive;
 900         blk_queue_segment_boundary(q, 0xffff);
 901
 902         if (!hwif->rqsize) {
 903                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
 904                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
 905                         hwif->rqsize = 256;
 906                 else
 907                         hwif->rqsize = 65536;
 908         }
 909         if (hwif->rqsize < max_sectors)
 910                 max_sectors = hwif->rqsize;
 911         blk_queue_max_sectors(q, max_sectors);
 912
 913 #ifdef CONFIG_PCI
 914         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 915          * creates segments that don't completely match our boundary
 916          * requirements and thus need to be broken up again. Because it
 917          * doesn't align properly either, we may actually have to break up
 918          * to more segments than what was we got in the first place, a max
 919          * worst case is twice as many.
 920          * This will be fixed once we teach pci_map_sg() about our boundary
 921          * requirements, hopefully soon. *FIXME*
 922          */
 923         if (!PCI_DMA_BUS_IS_PHYS)
 924                 max_sg_entries >>= 1;
 925 #endif /* CONFIG_PCI */
 926
 927         blk_queue_max_hw_segments(q, max_sg_entries);
 928         blk_queue_max_phys_segments(q, max_sg_entries);
 929
 930         /* assign drive queue */
 931         drive->queue = q;
 932
 933         /* needs drive->queue to be set */
 934         ide_toggle_bounce(drive, 1);
 935
 936         return 0;
 937 }
 938
 939 /*
 940  * This routine sets up the irq for an ide interface, and creates a new
 941  * hwgroup for the irq/hwif if none was previously assigned.
 942  *
 943  * Much of the code is for correctly detecting/handling irq sharing
 944  * and irq serialization situations.  This is somewhat complex because
 945  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 946  */
 947 static int init_irq (ide_hwif_t *hwif)
 948 {
 949         unsigned int index;
 950         ide_hwgroup_t *hwgroup;
 951         ide_hwif_t *match = NULL;
 952
 953
 954         BUG_ON(in_interrupt());
 955         BUG_ON(irqs_disabled());
 956         BUG_ON(hwif == NULL);
 957
 958         mutex_lock(&ide_cfg_mtx);
 959         hwif->hwgroup = NULL;
 960 #if MAX_HWIFS > 1
 961         /*
 962          * Group up with any other hwifs that share our irq(s).
 963          */
 964         for (index = 0; index < MAX_HWIFS; index++) {
 965                 ide_hwif_t *h = &ide_hwifs[index];
 966                 if (h->hwgroup) {  /* scan only initialized hwif's */
 967                         if (hwif->irq == h->irq) {
 968                                 hwif->sharing_irq = h->sharing_irq = 1;
 969                                 if (hwif->chipset != ide_pci ||
 970                                     h->chipset != ide_pci) {
 971                                         save_match(hwif, h, &match);
 972                                 }
 973                         }
 974                         if (hwif->serialized) {
 975                                 if (hwif->mate && hwif->mate->irq == h->irq)
 976                                         save_match(hwif, h, &match);
 977                         }
 978                         if (h->serialized) {
 979                                 if (h->mate && hwif->irq == h->mate->irq)
 980                                         save_match(hwif, h, &match);
 981                         }
 982                 }
 983         }
 984 #endif /* MAX_HWIFS > 1 */
 985         /*
 986          * If we are still without a hwgroup, then form a new one
 987          */
 988         if (match) {
 989                 hwgroup = match->hwgroup;
 990                 hwif->hwgroup = hwgroup;
 991                 /*
 992                  * Link us into the hwgroup.
 993                  * This must be done early, do ensure that unexpected_intr
 994                  * can find the hwif and prevent irq storms.
 995                  * No drives are attached to the new hwif, choose_drive
 996                  * can't do anything stupid (yet).
 997                  * Add ourself as the 2nd entry to the hwgroup->hwif
 998                  * linked list, the first entry is the hwif that owns
 999                  * hwgroup->handler - do not change that.
1000                  */
1001                 spin_lock_irq(&ide_lock);
1002                 hwif->next = hwgroup->hwif->next;
1003                 hwgroup->hwif->next = hwif;
1004                 spin_unlock_irq(&ide_lock);
1005         } else {
1006                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1007                                         GFP_KERNEL | __GFP_ZERO,
1008                                         hwif_to_node(hwif->drives[0].hwif));
1009                 if (!hwgroup)
1010                         goto out_up;
1011
1012                 hwif->hwgroup = hwgroup;
1013
1014                 hwgroup->hwif     = hwif->next = hwif;
1015                 hwgroup->rq       = NULL;
1016                 hwgroup->handler  = NULL;
1017                 hwgroup->drive    = NULL;
1018                 hwgroup->busy     = 0;
1019                 init_timer(&hwgroup->timer);
1020                 hwgroup->timer.function = &ide_timer_expiry;
1021                 hwgroup->timer.data = (unsigned long) hwgroup;
1022         }
1023
1024         /*
1025          * Allocate the irq, if not already obtained for another hwif
1026          */
1027         if (!match || match->irq != hwif->irq) {
1028                 int sa = 0;
1029 #if defined(__mc68000__) || defined(CONFIG_APUS)
1030                 sa = IRQF_SHARED;
1031 #endif /* __mc68000__ || CONFIG_APUS */
1032
1033                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1034                         sa = IRQF_SHARED;
1035
1036                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1037                         /* clear nIEN */
1038                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1039
1040                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1041                         goto out_unlink;
1042         }
1043
1044         /*
1045          * For any present drive:
1046          * - allocate the block device queue
1047          * - link drive into the hwgroup
1048          */
1049         for (index = 0; index < MAX_DRIVES; ++index) {
1050                 ide_drive_t *drive = &hwif->drives[index];
1051                 if (!drive->present)
1052                         continue;
1053                 if (ide_init_queue(drive)) {
1054                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1055                         continue;
1056                 }
1057                 spin_lock_irq(&ide_lock);
1058                 if (!hwgroup->drive) {
1059                         /* first drive for hwgroup. */
1060                         drive->next = drive;
1061                         hwgroup->drive = drive;
1062                         hwgroup->hwif = HWIF(hwgroup->drive);
1063                 } else {
1064                         drive->next = hwgroup->drive->next;
1065                         hwgroup->drive->next = drive;
1066                 }
1067                 spin_unlock_irq(&ide_lock);
1068         }
1069
1070 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1071         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1072                 hwif->io_ports[IDE_DATA_OFFSET],
1073                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1074                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1075 #else
1076         printk("%s at 0x%08lx on irq %d", hwif->name,
1077                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1078 #endif /* __mc68000__ && CONFIG_APUS */
1079         if (match)
1080                 printk(" (%sed with %s)",
1081                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1082         printk("\n");
1083         mutex_unlock(&ide_cfg_mtx);
1084         return 0;
1085 out_unlink:
1086         spin_lock_irq(&ide_lock);
1087         if (hwif->next == hwif) {
1088                 BUG_ON(match);
1089                 BUG_ON(hwgroup->hwif != hwif);
1090                 kfree(hwgroup);
1091         } else {
1092                 ide_hwif_t *g;
1093                 g = hwgroup->hwif;
1094                 while (g->next != hwif)
1095                         g = g->next;
1096                 g->next = hwif->next;
1097                 if (hwgroup->hwif == hwif) {
1098                         /* Impossible. */
1099                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1100                         hwgroup->hwif = g;
1101                 }
1102                 BUG_ON(hwgroup->hwif == hwif);
1103         }
1104         spin_unlock_irq(&ide_lock);
1105 out_up:
1106         mutex_unlock(&ide_cfg_mtx);
1107         return 1;
1108 }
1109
1110 static int ata_lock(dev_t dev, void *data)
1111 {
1112         /* FIXME: we want to pin hwif down */
1113         return 0;
1114 }
1115
1116 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1117 {
1118         ide_hwif_t *hwif = data;
1119         int unit = *part >> PARTN_BITS;
1120         ide_drive_t *drive = &hwif->drives[unit];
1121         if (!drive->present)
1122                 return NULL;
1123
1124         if (drive->media == ide_disk)
1125                 request_module("ide-disk");
1126         if (drive->scsi)
1127                 request_module("ide-scsi");
1128         if (drive->media == ide_cdrom || drive->media == ide_optical)
1129                 request_module("ide-cd");
1130         if (drive->media == ide_tape)
1131                 request_module("ide-tape");
1132         if (drive->media == ide_floppy)
1133                 request_module("ide-floppy");
1134
1135         return NULL;
1136 }
1137
1138 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1139 {
1140         struct gendisk *p = data;
1141         *part &= (1 << PARTN_BITS) - 1;
1142         return &p->dev.kobj;
1143 }
1144
1145 static int exact_lock(dev_t dev, void *data)
1146 {
1147         struct gendisk *p = data;
1148
1149         if (!get_disk(p))
1150                 return -1;
1151         return 0;
1152 }
1153
1154 void ide_register_region(struct gendisk *disk)
1155 {
1156         blk_register_region(MKDEV(disk->major, disk->first_minor),
1157                             disk->minors, NULL, exact_match, exact_lock, disk);
1158 }
1159
1160 EXPORT_SYMBOL_GPL(ide_register_region);
1161
1162 void ide_unregister_region(struct gendisk *disk)
1163 {
1164         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1165                               disk->minors);
1166 }
1167
1168 EXPORT_SYMBOL_GPL(ide_unregister_region);
1169
1170 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1171 {
1172         ide_hwif_t *hwif = drive->hwif;
1173         unsigned int unit = (drive->select.all >> 4) & 1;
1174
1175         disk->major = hwif->major;
1176         disk->first_minor = unit << PARTN_BITS;
1177         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1178         disk->queue = drive->queue;
1179 }
1180
1181 EXPORT_SYMBOL_GPL(ide_init_disk);
1182
1183 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1184 {
1185         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1186
1187         if (drive == drive->next) {
1188                 /* special case: last drive from hwgroup. */
1189                 BUG_ON(hwgroup->drive != drive);
1190                 hwgroup->drive = NULL;
1191         } else {
1192                 ide_drive_t *walk;
1193
1194                 walk = hwgroup->drive;
1195                 while (walk->next != drive)
1196                         walk = walk->next;
1197                 walk->next = drive->next;
1198                 if (hwgroup->drive == drive) {
1199                         hwgroup->drive = drive->next;
1200                         hwgroup->hwif = hwgroup->drive->hwif;
1201                 }
1202         }
1203         BUG_ON(hwgroup->drive == drive);
1204 }
1205
1206 static void drive_release_dev (struct device *dev)
1207 {
1208         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1209
1210         spin_lock_irq(&ide_lock);
1211         ide_remove_drive_from_hwgroup(drive);
1212         kfree(drive->id);
1213         drive->id = NULL;
1214         drive->present = 0;
1215         /* Messed up locking ... */
1216         spin_unlock_irq(&ide_lock);
1217         blk_cleanup_queue(drive->queue);
1218         spin_lock_irq(&ide_lock);
1219         drive->queue = NULL;
1220         spin_unlock_irq(&ide_lock);
1221
1222         complete(&drive->gendev_rel_comp);
1223 }
1224
1225 /*
1226  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1227  * after probing for drives, to allocate partition tables and other data
1228  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1229  * somewhat later, during the partition check.
1230  */
1231 static void init_gendisk (ide_hwif_t *hwif)
1232 {
1233         unsigned int unit;
1234
1235         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1236                 ide_drive_t * drive = &hwif->drives[unit];
1237                 ide_add_generic_settings(drive);
1238                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1239                          hwif->index,unit);
1240                 drive->gendev.parent = &hwif->gendev;
1241                 drive->gendev.bus = &ide_bus_type;
1242                 drive->gendev.driver_data = drive;
1243                 drive->gendev.release = drive_release_dev;
1244         }
1245         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1246                         THIS_MODULE, ata_probe, ata_lock, hwif);
1247 }
1248
1249 static int hwif_init(ide_hwif_t *hwif)
1250 {
1251         int old_irq;
1252
1253         /* Return success if no device is connected */
1254         if (!hwif->present)
1255                 return 1;
1256
1257         if (!hwif->irq) {
1258                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1259                 {
1260                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1261                         return (hwif->present = 0);
1262                 }
1263         }
1264 #ifdef CONFIG_BLK_DEV_HD
1265         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1266                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1267                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1268                 return (hwif->present = 0);
1269         }
1270 #endif /* CONFIG_BLK_DEV_HD */
1271
1272         /* we set it back to 1 if all is ok below */
1273         hwif->present = 0;
1274
1275         if (register_blkdev(hwif->major, hwif->name))
1276                 return 0;
1277
1278         if (!hwif->sg_max_nents)
1279                 hwif->sg_max_nents = PRD_ENTRIES;
1280
1281         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1282                                  GFP_KERNEL);
1283         if (!hwif->sg_table) {
1284                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1285                 goto out;
1286         }
1287
1288         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1289
1290         if (init_irq(hwif) == 0)
1291                 goto done;
1292
1293         old_irq = hwif->irq;
1294         /*
1295          *      It failed to initialise. Find the default IRQ for
1296          *      this port and try that.
1297          */
1298         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1299                 printk("%s: Disabled unable to get IRQ %d.\n",
1300                         hwif->name, old_irq);
1301                 goto out;
1302         }
1303         if (init_irq(hwif)) {
1304                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1305                         hwif->name, old_irq, hwif->irq);
1306                 goto out;
1307         }
1308         printk("%s: probed IRQ %d failed, using default.\n",
1309                 hwif->name, hwif->irq);
1310
1311 done:
1312         init_gendisk(hwif);
1313
1314         ide_acpi_init(hwif);
1315
1316         hwif->present = 1;      /* success */
1317         return 1;
1318
1319 out:
1320         unregister_blkdev(hwif->major, hwif->name);
1321         return 0;
1322 }
1323
1324 static void hwif_register_devices(ide_hwif_t *hwif)
1325 {
1326         unsigned int i;
1327
1328         for (i = 0; i < MAX_DRIVES; i++) {
1329                 ide_drive_t *drive = &hwif->drives[i];
1330
1331                 if (drive->present) {
1332                         int ret = device_register(&drive->gendev);
1333
1334                         if (ret < 0)
1335                                 printk(KERN_WARNING "IDE: %s: "
1336                                         "device_register error: %d\n",
1337                                         __FUNCTION__, ret);
1338                 }
1339         }
1340 }
1341
1342 int ide_device_add_all(u8 *idx)
1343 {
1344         ide_hwif_t *hwif;
1345         int i, rc = 0;
1346
1347         for (i = 0; i < MAX_HWIFS; i++) {
1348                 if (idx[i] == 0xff)
1349                         continue;
1350
1351                 probe_hwif(&ide_hwifs[idx[i]]);
1352         }
1353
1354         for (i = 0; i < MAX_HWIFS; i++) {
1355                 if (idx[i] == 0xff)
1356                         continue;
1357
1358                 hwif = &ide_hwifs[idx[i]];
1359
1360                 if (hwif_init(hwif) == 0) {
1361                         printk(KERN_INFO "%s: failed to initialize IDE "
1362                                          "interface\n", hwif->name);
1363                         rc = -1;
1364                         continue;
1365                 }
1366         }
1367
1368         for (i = 0; i < MAX_HWIFS; i++) {
1369                 if (idx[i] == 0xff)
1370                         continue;
1371
1372                 hwif = &ide_hwifs[idx[i]];
1373
1374                 if (hwif->present) {
1375                         if (hwif->chipset == ide_unknown ||
1376                             hwif->chipset == ide_forced)
1377                                 hwif->chipset = ide_generic;
1378                         hwif_register_devices(hwif);
1379                 }
1380         }
1381
1382         for (i = 0; i < MAX_HWIFS; i++) {
1383                 if (idx[i] != 0xff)
1384                         ide_proc_register_port(&ide_hwifs[idx[i]]);
1385         }
1386
1387         return rc;
1388 }
1389 EXPORT_SYMBOL_GPL(ide_device_add_all);
1390
1391 int ide_device_add(u8 idx[4])
1392 {
1393         u8 idx_all[MAX_HWIFS];
1394         int i;
1395
1396         for (i = 0; i < MAX_HWIFS; i++)
1397                 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1398
1399         return ide_device_add_all(idx_all);
1400 }
1401 EXPORT_SYMBOL_GPL(ide_device_add);