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