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