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  * Version 1.00         move drive probing code from ide.c to ide-probe.c
  17  * Version 1.01         fix compilation problem for m68k
  18  * Version 1.02         increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  19  *                       by Andrea Arcangeli
  20  * Version 1.03         fix for (hwif->chipset == ide_4drives)
  21  * Version 1.04         fixed buggy treatments of known flash memory cards
  22  *
  23  * Version 1.05         fix for (hwif->chipset == ide_pdc4030)
  24  *                      added ide6/7/8/9
  25  *                      allowed for secondary flash card to be detectable
  26  *                       with new flag : drive->ata_flash : 1;
  27  * Version 1.06         stream line request queue and prep for cascade project.
  28  * Version 1.07         max_sect <= 255; slower disks would get behind and
  29  *                      then fall over when they get to 256.    Paul G.
  30  * Version 1.10         Update set for new IDE. drive->id is now always
  31  *                      valid after probe time even with noprobe
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/types.h>
  36 #include <linux/string.h>
  37 #include <linux/kernel.h>
  38 #include <linux/timer.h>
  39 #include <linux/mm.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/major.h>
  42 #include <linux/errno.h>
  43 #include <linux/genhd.h>
  44 #include <linux/slab.h>
  45 #include <linux/delay.h>
  46 #include <linux/ide.h>
  47 #include <linux/spinlock.h>
  48 #include <linux/kmod.h>
  49 #include <linux/pci.h>
  50
  51 #include <asm/byteorder.h>
  52 #include <asm/irq.h>
  53 #include <asm/uaccess.h>
  54 #include <asm/io.h>
  55
  56 /**
  57  *      generic_id              -       add a generic drive id
  58  *      @drive: drive to make an ID block for
  59  *
  60  *      Add a fake id field to the drive we are passed. This allows
  61  *      use to skip a ton of NULL checks (which people always miss)
  62  *      and make drive properties unconditional outside of this file
  63  */
  64
  65 static void generic_id(ide_drive_t *drive)
  66 {
  67         drive->id->cyls = drive->cyl;
  68         drive->id->heads = drive->head;
  69         drive->id->sectors = drive->sect;
  70         drive->id->cur_cyls = drive->cyl;
  71         drive->id->cur_heads = drive->head;
  72         drive->id->cur_sectors = drive->sect;
  73 }
  74
  75 static void ide_disk_init_chs(ide_drive_t *drive)
  76 {
  77         struct hd_driveid *id = drive->id;
  78
  79         /* Extract geometry if we did not already have one for the drive */
  80         if (!drive->cyl || !drive->head || !drive->sect) {
  81                 drive->cyl  = drive->bios_cyl  = id->cyls;
  82                 drive->head = drive->bios_head = id->heads;
  83                 drive->sect = drive->bios_sect = id->sectors;
  84         }
  85
  86         /* Handle logical geometry translation by the drive */
  87         if ((id->field_valid & 1) && id->cur_cyls &&
  88             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
  89                 drive->cyl  = id->cur_cyls;
  90                 drive->head = id->cur_heads;
  91                 drive->sect = id->cur_sectors;
  92         }
  93
  94         /* Use physical geometry if what we have still makes no sense */
  95         if (drive->head > 16 && id->heads && id->heads <= 16) {
  96                 drive->cyl  = id->cyls;
  97                 drive->head = id->heads;
  98                 drive->sect = id->sectors;
  99         }
 100 }
 101
 102 static void ide_disk_init_mult_count(ide_drive_t *drive)
 103 {
 104         struct hd_driveid *id = drive->id;
 105
 106         drive->mult_count = 0;
 107         if (id->max_multsect) {
 108 #ifdef CONFIG_IDEDISK_MULTI_MODE
 109                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
 110                 id->multsect_valid = id->multsect ? 1 : 0;
 111                 drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
 112                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
 113 #else   /* original, pre IDE-NFG, per request of AC */
 114                 drive->mult_req = INITIAL_MULT_COUNT;
 115                 if (drive->mult_req > id->max_multsect)
 116                         drive->mult_req = id->max_multsect;
 117                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
 118                         drive->special.b.set_multmode = 1;
 119 #endif
 120         }
 121 }
 122
 123 /**
 124  *      do_identify     -       identify a drive
 125  *      @drive: drive to identify
 126  *      @cmd: command used
 127  *
 128  *      Called when we have issued a drive identify command to
 129  *      read and parse the results. This function is run with
 130  *      interrupts disabled.
 131  */
 132
 133 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 134 {
 135         ide_hwif_t *hwif = HWIF(drive);
 136         int bswap = 1;
 137         struct hd_driveid *id;
 138
 139         id = drive->id;
 140         /* read 512 bytes of id info */
 141         hwif->ata_input_data(drive, id, SECTOR_WORDS);
 142
 143         drive->id_read = 1;
 144         local_irq_enable();
 145         ide_fix_driveid(id);
 146
 147 #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 148         /*
 149          * EATA SCSI controllers do a hardware ATA emulation:
 150          * Ignore them if there is a driver for them available.
 151          */
 152         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 153             (id->model[0] == 'S' && id->model[1] == 'K')) {
 154                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 155                 goto err_misc;
 156         }
 157 #endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
 158
 159         /*
 160          *  WIN_IDENTIFY returns little-endian info,
 161          *  WIN_PIDENTIFY *usually* returns little-endian info.
 162          */
 163         if (cmd == WIN_PIDENTIFY) {
 164                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 165                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 166                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 167                         /* Vertos drives may still be weird */
 168                         bswap ^= 1;
 169         }
 170         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 171         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 172         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 173
 174         if (strstr(id->model, "E X A B Y T E N E S T"))
 175                 goto err_misc;
 176
 177         /* we depend on this a lot! */
 178         id->model[sizeof(id->model)-1] = '\0';
 179         printk("%s: %s, ", drive->name, id->model);
 180         drive->present = 1;
 181         drive->dead = 0;
 182
 183         /*
 184          * Check for an ATAPI device
 185          */
 186         if (cmd == WIN_PIDENTIFY) {
 187                 u8 type = (id->config >> 8) & 0x1f;
 188                 printk("ATAPI ");
 189                 switch (type) {
 190                         case ide_floppy:
 191                                 if (!strstr(id->model, "CD-ROM")) {
 192                                         if (!strstr(id->model, "oppy") &&
 193                                             !strstr(id->model, "poyp") &&
 194                                             !strstr(id->model, "ZIP"))
 195                                                 printk("cdrom or floppy?, assuming ");
 196                                         if (drive->media != ide_cdrom) {
 197                                                 printk ("FLOPPY");
 198                                                 drive->removable = 1;
 199                                                 break;
 200                                         }
 201                                 }
 202                                 /* Early cdrom models used zero */
 203                                 type = ide_cdrom;
 204                         case ide_cdrom:
 205                                 drive->removable = 1;
 206 #ifdef CONFIG_PPC
 207                                 /* kludge for Apple PowerBook internal zip */
 208                                 if (!strstr(id->model, "CD-ROM") &&
 209                                     strstr(id->model, "ZIP")) {
 210                                         printk ("FLOPPY");
 211                                         type = ide_floppy;
 212                                         break;
 213                                 }
 214 #endif
 215                                 printk ("CD/DVD-ROM");
 216                                 break;
 217                         case ide_tape:
 218                                 printk ("TAPE");
 219                                 break;
 220                         case ide_optical:
 221                                 printk ("OPTICAL");
 222                                 drive->removable = 1;
 223                                 break;
 224                         default:
 225                                 printk("UNKNOWN (type %d)", type);
 226                                 break;
 227                 }
 228                 printk (" drive\n");
 229                 drive->media = type;
 230                 /* an ATAPI device ignores DRDY */
 231                 drive->ready_stat = 0;
 232                 return;
 233         }
 234
 235         /*
 236          * Not an ATAPI device: looks like a "regular" hard disk
 237          */
 238
 239         /*
 240          * 0x848a = CompactFlash device
 241          * These are *not* removable in Linux definition of the term
 242          */
 243
 244         if ((id->config != 0x848a) && (id->config & (1<<7)))
 245                 drive->removable = 1;
 246
 247         drive->media = ide_disk;
 248         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
 249         QUIRK_LIST(drive);
 250         return;
 251
 252 err_misc:
 253         kfree(id);
 254         drive->present = 0;
 255         return;
 256 }
 257
 258 /**
 259  *      actual_try_to_identify  -       send ata/atapi identify
 260  *      @drive: drive to identify
 261  *      @cmd: command to use
 262  *
 263  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 264  *      and waits for a response.  It also monitors irqs while this is
 265  *      happening, in hope of automatically determining which one is
 266  *      being used by the interface.
 267  *
 268  *      Returns:        0  device was identified
 269  *                      1  device timed-out (no response to identify request)
 270  *                      2  device aborted the command (refused to identify itself)
 271  */
 272
 273 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 274 {
 275         ide_hwif_t *hwif = HWIF(drive);
 276         int rc;
 277         unsigned long hd_status;
 278         unsigned long timeout;
 279         u8 s = 0, a = 0;
 280
 281         /* take a deep breath */
 282         msleep(50);
 283
 284         if (IDE_CONTROL_REG) {
 285                 a = hwif->INB(IDE_ALTSTATUS_REG);
 286                 s = hwif->INB(IDE_STATUS_REG);
 287                 if ((a ^ s) & ~INDEX_STAT) {
 288                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 289                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 290                         /* ancient Seagate drives, broken interfaces */
 291                         hd_status = IDE_STATUS_REG;
 292                 } else {
 293                         /* use non-intrusive polling */
 294                         hd_status = IDE_ALTSTATUS_REG;
 295                 }
 296         } else
 297                 hd_status = IDE_STATUS_REG;
 298
 299         /* set features register for atapi
 300          * identify command to be sure of reply
 301          */
 302         if ((cmd == WIN_PIDENTIFY))
 303                 /* disable dma & overlap */
 304                 hwif->OUTB(0, IDE_FEATURE_REG);
 305
 306         /* ask drive for ID */
 307         hwif->OUTB(cmd, IDE_COMMAND_REG);
 308
 309         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 310         timeout += jiffies;
 311         do {
 312                 if (time_after(jiffies, timeout)) {
 313                         /* drive timed-out */
 314                         return 1;
 315                 }
 316                 /* give drive a breather */
 317                 msleep(50);
 318         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 319
 320         /* wait for IRQ and DRQ_STAT */
 321         msleep(50);
 322         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 323                 unsigned long flags;
 324
 325                 /* local CPU only; some systems need this */
 326                 local_irq_save(flags);
 327                 /* drive returned ID */
 328                 do_identify(drive, cmd);
 329                 /* drive responded with ID */
 330                 rc = 0;
 331                 /* clear drive IRQ */
 332                 (void) hwif->INB(IDE_STATUS_REG);
 333                 local_irq_restore(flags);
 334         } else {
 335                 /* drive refused ID */
 336                 rc = 2;
 337         }
 338         return rc;
 339 }
 340
 341 /**
 342  *      try_to_identify -       try to identify a drive
 343  *      @drive: drive to probe
 344  *      @cmd: command to use
 345  *
 346  *      Issue the identify command and then do IRQ probing to
 347  *      complete the identification when needed by finding the
 348  *      IRQ the drive is attached to
 349  */
 350
 351 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 352 {
 353         ide_hwif_t *hwif = HWIF(drive);
 354         int retval;
 355         int autoprobe = 0;
 356         unsigned long cookie = 0;
 357
 358         /*
 359          * Disable device irq unless we need to
 360          * probe for it. Otherwise we'll get spurious
 361          * interrupts during the identify-phase that
 362          * the irq handler isn't expecting.
 363          */
 364         if (IDE_CONTROL_REG) {
 365                 u8 ctl = drive->ctl | 2;
 366                 if (!hwif->irq) {
 367                         autoprobe = 1;
 368                         cookie = probe_irq_on();
 369                         /* enable device irq */
 370                         ctl &= ~2;
 371                 }
 372                 hwif->OUTB(ctl, IDE_CONTROL_REG);
 373         }
 374
 375         retval = actual_try_to_identify(drive, cmd);
 376
 377         if (autoprobe) {
 378                 int irq;
 379                 /* mask device irq */
 380                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 381                 /* clear drive IRQ */
 382                 (void) hwif->INB(IDE_STATUS_REG);
 383                 udelay(5);
 384                 irq = probe_irq_off(cookie);
 385                 if (!hwif->irq) {
 386                         if (irq > 0) {
 387                                 hwif->irq = irq;
 388                         } else {
 389                                 /* Mmmm.. multiple IRQs..
 390                                  * don't know which was ours
 391                                  */
 392                                 printk("%s: IRQ probe failed (0x%lx)\n",
 393                                         drive->name, cookie);
 394                         }
 395                 }
 396         }
 397         return retval;
 398 }
 399
 400
 401 /**
 402  *      do_probe                -       probe an IDE device
 403  *      @drive: drive to probe
 404  *      @cmd: command to use
 405  *
 406  *      do_probe() has the difficult job of finding a drive if it exists,
 407  *      without getting hung up if it doesn't exist, without trampling on
 408  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 409  *
 410  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 411  *      but does not respond right away, the probe will "hang in there"
 412  *      for the maximum wait time (about 30 seconds), otherwise it will
 413  *      exit much more quickly.
 414  *
 415  * Returns:     0  device was identified
 416  *              1  device timed-out (no response to identify request)
 417  *              2  device aborted the command (refused to identify itself)
 418  *              3  bad status from device (possible for ATAPI drives)
 419  *              4  probe was not attempted because failure was obvious
 420  */
 421
 422 static int do_probe (ide_drive_t *drive, u8 cmd)
 423 {
 424         int rc;
 425         ide_hwif_t *hwif = HWIF(drive);
 426
 427         if (drive->present) {
 428                 /* avoid waiting for inappropriate probes */
 429                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 430                         return 4;
 431         }
 432 #ifdef DEBUG
 433         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 434                 drive->name, drive->present, drive->media,
 435                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 436 #endif
 437
 438         /* needed for some systems
 439          * (e.g. crw9624 as drive0 with disk as slave)
 440          */
 441         msleep(50);
 442         SELECT_DRIVE(drive);
 443         msleep(50);
 444         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 445                 if (drive->select.b.unit != 0) {
 446                         /* exit with drive0 selected */
 447                         SELECT_DRIVE(&hwif->drives[0]);
 448                         /* allow BUSY_STAT to assert & clear */
 449                         msleep(50);
 450                 }
 451                 /* no i/f present: mmm.. this should be a 4 -ml */
 452                 return 3;
 453         }
 454
 455         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 456             drive->present || cmd == WIN_PIDENTIFY) {
 457                 /* send cmd and wait */
 458                 if ((rc = try_to_identify(drive, cmd))) {
 459                         /* failed: try again */
 460                         rc = try_to_identify(drive,cmd);
 461                 }
 462                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 463                         return 4;
 464
 465                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 466                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 467                         (drive->autotune == IDE_TUNE_AUTO))) {
 468                         unsigned long timeout;
 469                         printk("%s: no response (status = 0x%02x), "
 470                                 "resetting drive\n", drive->name,
 471                                 hwif->INB(IDE_STATUS_REG));
 472                         msleep(50);
 473                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 474                         msleep(50);
 475                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 476                         timeout = jiffies;
 477                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
 478                                time_before(jiffies, timeout + WAIT_WORSTCASE))
 479                                 msleep(50);
 480                         rc = try_to_identify(drive, cmd);
 481                 }
 482                 if (rc == 1)
 483                         printk("%s: no response (status = 0x%02x)\n",
 484                                 drive->name, hwif->INB(IDE_STATUS_REG));
 485                 /* ensure drive irq is clear */
 486                 (void) hwif->INB(IDE_STATUS_REG);
 487         } else {
 488                 /* not present or maybe ATAPI */
 489                 rc = 3;
 490         }
 491         if (drive->select.b.unit != 0) {
 492                 /* exit with drive0 selected */
 493                 SELECT_DRIVE(&hwif->drives[0]);
 494                 msleep(50);
 495                 /* ensure drive irq is clear */
 496                 (void) hwif->INB(IDE_STATUS_REG);
 497         }
 498         return rc;
 499 }
 500
 501 /*
 502  *
 503  */
 504 static void enable_nest (ide_drive_t *drive)
 505 {
 506         ide_hwif_t *hwif = HWIF(drive);
 507         unsigned long timeout;
 508
 509         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 510         SELECT_DRIVE(drive);
 511         msleep(50);
 512         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 513         timeout = jiffies + WAIT_WORSTCASE;
 514         do {
 515                 if (time_after(jiffies, timeout)) {
 516                         printk("failed (timeout)\n");
 517                         return;
 518                 }
 519                 msleep(50);
 520         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 521
 522         msleep(50);
 523
 524         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 525                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 526         } else {
 527                 printk("success\n");
 528         }
 529
 530         /* if !(success||timed-out) */
 531         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 532                 /* look for ATAPI device */
 533                 (void) do_probe(drive, WIN_PIDENTIFY);
 534         }
 535 }
 536
 537 /**
 538  *      probe_for_drives        -       upper level drive probe
 539  *      @drive: drive to probe for
 540  *
 541  *      probe_for_drive() tests for existence of a given drive using do_probe()
 542  *      and presents things to the user as needed.
 543  *
 544  *      Returns:        0  no device was found
 545  *                      1  device was found (note: drive->present might
 546  *                         still be 0)
 547  */
 548
 549 static inline u8 probe_for_drive (ide_drive_t *drive)
 550 {
 551         /*
 552          *      In order to keep things simple we have an id
 553          *      block for all drives at all times. If the device
 554          *      is pre ATA or refuses ATA/ATAPI identify we
 555          *      will add faked data to this.
 556          *
 557          *      Also note that 0 everywhere means "can't do X"
 558          */
 559
 560         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 561         drive->id_read = 0;
 562         if(drive->id == NULL)
 563         {
 564                 printk(KERN_ERR "ide: out of memory for id data.\n");
 565                 return 0;
 566         }
 567         strcpy(drive->id->model, "UNKNOWN");
 568
 569         /* skip probing? */
 570         if (!drive->noprobe)
 571         {
 572                 /* if !(success||timed-out) */
 573                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 574                         /* look for ATAPI device */
 575                         (void) do_probe(drive, WIN_PIDENTIFY);
 576                 }
 577                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 578                         enable_nest(drive);
 579                 if (!drive->present)
 580                         /* drive not found */
 581                         return 0;
 582
 583                 /* identification failed? */
 584                 if (!drive->id_read) {
 585                         if (drive->media == ide_disk) {
 586                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 587                                         drive->name, drive->cyl,
 588                                         drive->head, drive->sect);
 589                         } else if (drive->media == ide_cdrom) {
 590                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 591                         } else {
 592                                 /* nuke it */
 593                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 594                                 drive->present = 0;
 595                         }
 596                 }
 597                 /* drive was found */
 598         }
 599         if(!drive->present)
 600                 return 0;
 601         /* The drive wasn't being helpful. Add generic info only */
 602         if (drive->id_read == 0) {
 603                 generic_id(drive);
 604                 return 1;
 605         }
 606
 607         if (drive->media == ide_disk) {
 608                 ide_disk_init_chs(drive);
 609                 ide_disk_init_mult_count(drive);
 610         }
 611
 612         return drive->present;
 613 }
 614
 615 static void hwif_release_dev (struct device *dev)
 616 {
 617         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 618
 619         complete(&hwif->gendev_rel_comp);
 620 }
 621
 622 static void hwif_register (ide_hwif_t *hwif)
 623 {
 624         int ret;
 625
 626         /* register with global device tree */
 627         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 628         hwif->gendev.driver_data = hwif;
 629         if (hwif->gendev.parent == NULL) {
 630                 if (hwif->pci_dev)
 631                         hwif->gendev.parent = &hwif->pci_dev->dev;
 632                 else
 633                         /* Would like to do = &device_legacy */
 634                         hwif->gendev.parent = NULL;
 635         }
 636         hwif->gendev.release = hwif_release_dev;
 637         ret = device_register(&hwif->gendev);
 638         if (ret < 0)
 639                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 640                         __FUNCTION__, ret);
 641 }
 642
 643 static int wait_hwif_ready(ide_hwif_t *hwif)
 644 {
 645         int rc;
 646
 647         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 648
 649         /* Let HW settle down a bit from whatever init state we
 650          * come from */
 651         mdelay(2);
 652
 653         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 654          * I know of at least one disk who takes 31 seconds, I use 35
 655          * here to be safe
 656          */
 657         rc = ide_wait_not_busy(hwif, 35000);
 658         if (rc)
 659                 return rc;
 660
 661         /* Now make sure both master & slave are ready */
 662         SELECT_DRIVE(&hwif->drives[0]);
 663         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 664         mdelay(2);
 665         rc = ide_wait_not_busy(hwif, 35000);
 666         if (rc)
 667                 return rc;
 668         SELECT_DRIVE(&hwif->drives[1]);
 669         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 670         mdelay(2);
 671         rc = ide_wait_not_busy(hwif, 35000);
 672
 673         /* Exit function with master reselected (let's be sane) */
 674         SELECT_DRIVE(&hwif->drives[0]);
 675
 676         return rc;
 677 }
 678
 679 /**
 680  *      ide_undecoded_slave     -       look for bad CF adapters
 681  *      @hwif: interface
 682  *
 683  *      Analyse the drives on the interface and attempt to decide if we
 684  *      have the same drive viewed twice. This occurs with crap CF adapters
 685  *      and PCMCIA sometimes.
 686  */
 687
 688 void ide_undecoded_slave(ide_hwif_t *hwif)
 689 {
 690         ide_drive_t *drive0 = &hwif->drives[0];
 691         ide_drive_t *drive1 = &hwif->drives[1];
 692
 693         if (drive0->present == 0 || drive1->present == 0)
 694                 return;
 695
 696         /* If the models don't match they are not the same product */
 697         if (strcmp(drive0->id->model, drive1->id->model))
 698                 return;
 699
 700         /* Serial numbers do not match */
 701         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 702                 return;
 703
 704         /* No serial number, thankfully very rare for CF */
 705         if (drive0->id->serial_no[0] == 0)
 706                 return;
 707
 708         /* Appears to be an IDE flash adapter with decode bugs */
 709         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 710
 711         drive1->present = 0;
 712 }
 713
 714 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 715
 716 /*
 717  * This routine only knows how to look for drive units 0 and 1
 718  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 719  */
 720 static void probe_hwif(ide_hwif_t *hwif)
 721 {
 722         unsigned int unit;
 723         unsigned long flags;
 724         unsigned int irqd;
 725
 726         if (hwif->noprobe)
 727                 return;
 728
 729         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 730             (ide_hwif_request_regions(hwif))) {
 731                 u16 msgout = 0;
 732                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 733                         ide_drive_t *drive = &hwif->drives[unit];
 734                         if (drive->present) {
 735                                 drive->present = 0;
 736                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 737                                         drive->name);
 738                                 msgout = 1;
 739                         }
 740                 }
 741                 if (!msgout)
 742                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 743                                 hwif->name);
 744                 return;
 745         }
 746
 747         /*
 748          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 749          * we'll install our IRQ driver much later...
 750          */
 751         irqd = hwif->irq;
 752         if (irqd)
 753                 disable_irq(hwif->irq);
 754
 755         local_irq_set(flags);
 756
 757         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 758          * platforms. Typical cases are:
 759          *
 760          *  - The firmware hard reset the disk before booting the kernel,
 761          *    the drive is still doing it's poweron-reset sequence, that
 762          *    can take up to 30 seconds
 763          *  - The firmware does nothing (or no firmware), the device is
 764          *    still in POST state (same as above actually).
 765          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 766          *    their reset sequence even when they are non-selected slave
 767          *    devices, thus preventing discovery of the main HD
 768          *
 769          *  Doing this wait-for-busy should not harm any existing configuration
 770          *  (at least things won't be worse than what current code does, that
 771          *  is blindly go & talk to the drive) and fix some issues like the
 772          *  above.
 773          *
 774          *  BenH.
 775          */
 776         if (wait_hwif_ready(hwif) == -EBUSY)
 777                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 778
 779         /*
 780          * Second drive should only exist if first drive was found,
 781          * but a lot of cdrom drives are configured as single slaves.
 782          */
 783         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 784                 ide_drive_t *drive = &hwif->drives[unit];
 785                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 786                 (void) probe_for_drive(drive);
 787                 if (drive->present && !hwif->present) {
 788                         hwif->present = 1;
 789                         if (hwif->chipset != ide_4drives ||
 790                             !hwif->mate ||
 791                             !hwif->mate->present) {
 792                                 hwif_register(hwif);
 793                         }
 794                 }
 795         }
 796         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 797                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 798                 u8 stat;
 799
 800                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 801                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 802                 udelay(10);
 803                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 804                 do {
 805                         msleep(50);
 806                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 807                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 808
 809         }
 810         local_irq_restore(flags);
 811         /*
 812          * Use cached IRQ number. It might be (and is...) changed by probe
 813          * code above
 814          */
 815         if (irqd)
 816                 enable_irq(irqd);
 817
 818         if (!hwif->present) {
 819                 ide_hwif_release_regions(hwif);
 820                 return;
 821         }
 822
 823         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 824                 ide_drive_t *drive = &hwif->drives[unit];
 825
 826                 if (drive->present) {
 827                         if (hwif->tuneproc != NULL &&
 828                                 drive->autotune == IDE_TUNE_AUTO)
 829                                 /* auto-tune PIO mode */
 830                                 hwif->tuneproc(drive, 255);
 831
 832                         if (drive->autotune != IDE_TUNE_DEFAULT &&
 833                             drive->autotune != IDE_TUNE_AUTO)
 834                                 continue;
 835
 836                         drive->nice1 = 1;
 837
 838                         /*
 839                          * MAJOR HACK BARF :-/
 840                          *
 841                          * FIXME: chipsets own this cruft!
 842                          */
 843                         /*
 844                          * Move here to prevent module loading clashing.
 845                          */
 846         //              drive->autodma = hwif->autodma;
 847                         if (hwif->ide_dma_check) {
 848                                 /*
 849                                  * Force DMAing for the beginning of the check.
 850                                  * Some chipsets appear to do interesting
 851                                  * things, if not checked and cleared.
 852                                  *   PARANOIA!!!
 853                                  */
 854                                 hwif->dma_off_quietly(drive);
 855 #ifdef CONFIG_IDEDMA_ONLYDISK
 856                                 if (drive->media == ide_disk)
 857 #endif
 858                                         ide_set_dma(drive);
 859                         }
 860                 }
 861         }
 862
 863         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 864                 ide_drive_t *drive = &hwif->drives[unit];
 865
 866                 if (hwif->no_io_32bit)
 867                         drive->no_io_32bit = 1;
 868                 else
 869                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 870         }
 871 }
 872
 873 static int hwif_init(ide_hwif_t *hwif);
 874
 875 int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
 876 {
 877         probe_hwif(hwif);
 878
 879         if (fixup)
 880                 fixup(hwif);
 881
 882         if (!hwif_init(hwif)) {
 883                 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
 884                                  hwif->name);
 885                 return -1;
 886         }
 887
 888         if (hwif->present) {
 889                 u16 unit = 0;
 890                 int ret;
 891
 892                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 893                         ide_drive_t *drive = &hwif->drives[unit];
 894                         /* For now don't attach absent drives, we may
 895                            want them on default or a new "empty" class
 896                            for hotplug reprobing ? */
 897                         if (drive->present) {
 898                                 ret = device_register(&drive->gendev);
 899                                 if (ret < 0)
 900                                         printk(KERN_WARNING "IDE: %s: "
 901                                                 "device_register error: %d\n",
 902                                                 __FUNCTION__, ret);
 903                         }
 904                 }
 905         }
 906         return 0;
 907 }
 908
 909 int probe_hwif_init(ide_hwif_t *hwif)
 910 {
 911         return probe_hwif_init_with_fixup(hwif, NULL);
 912 }
 913
 914 EXPORT_SYMBOL(probe_hwif_init);
 915
 916 #if MAX_HWIFS > 1
 917 /*
 918  * save_match() is used to simplify logic in init_irq() below.
 919  *
 920  * A loophole here is that we may not know about a particular
 921  * hwif's irq until after that hwif is actually probed/initialized..
 922  * This could be a problem for the case where an hwif is on a
 923  * dual interface that requires serialization (eg. cmd640) and another
 924  * hwif using one of the same irqs is initialized beforehand.
 925  *
 926  * This routine detects and reports such situations, but does not fix them.
 927  */
 928 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 929 {
 930         ide_hwif_t *m = *match;
 931
 932         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 933                 if (!new->hwgroup)
 934                         return;
 935                 printk("%s: potential irq problem with %s and %s\n",
 936                         hwif->name, new->name, m->name);
 937         }
 938         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 939                 *match = new;
 940 }
 941 #endif /* MAX_HWIFS > 1 */
 942
 943 /*
 944  * init request queue
 945  */
 946 static int ide_init_queue(ide_drive_t *drive)
 947 {
 948         request_queue_t *q;
 949         ide_hwif_t *hwif = HWIF(drive);
 950         int max_sectors = 256;
 951         int max_sg_entries = PRD_ENTRIES;
 952
 953         /*
 954          *      Our default set up assumes the normal IDE case,
 955          *      that is 64K segmenting, standard PRD setup
 956          *      and LBA28. Some drivers then impose their own
 957          *      limits and LBA48 we could raise it but as yet
 958          *      do not.
 959          */
 960
 961         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 962         if (!q)
 963                 return 1;
 964
 965         q->queuedata = drive;
 966         blk_queue_segment_boundary(q, 0xffff);
 967
 968         if (!hwif->rqsize) {
 969                 if (hwif->no_lba48 || hwif->no_lba48_dma)
 970                         hwif->rqsize = 256;
 971                 else
 972                         hwif->rqsize = 65536;
 973         }
 974         if (hwif->rqsize < max_sectors)
 975                 max_sectors = hwif->rqsize;
 976         blk_queue_max_sectors(q, max_sectors);
 977
 978 #ifdef CONFIG_PCI
 979         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 980          * creates segments that don't completely match our boundary
 981          * requirements and thus need to be broken up again. Because it
 982          * doesn't align properly either, we may actually have to break up
 983          * to more segments than what was we got in the first place, a max
 984          * worst case is twice as many.
 985          * This will be fixed once we teach pci_map_sg() about our boundary
 986          * requirements, hopefully soon. *FIXME*
 987          */
 988         if (!PCI_DMA_BUS_IS_PHYS)
 989                 max_sg_entries >>= 1;
 990 #endif /* CONFIG_PCI */
 991
 992         blk_queue_max_hw_segments(q, max_sg_entries);
 993         blk_queue_max_phys_segments(q, max_sg_entries);
 994
 995         /* assign drive queue */
 996         drive->queue = q;
 997
 998         /* needs drive->queue to be set */
 999         ide_toggle_bounce(drive, 1);
1000
1001         return 0;
1002 }
1003
1004 /*
1005  * This routine sets up the irq for an ide interface, and creates a new
1006  * hwgroup for the irq/hwif if none was previously assigned.
1007  *
1008  * Much of the code is for correctly detecting/handling irq sharing
1009  * and irq serialization situations.  This is somewhat complex because
1010  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1011  *
1012  * The IRQF_DISABLED in sa_flags means ide_intr() is always entered with
1013  * interrupts completely disabled.  This can be bad for interrupt latency,
1014  * but anything else has led to problems on some machines.  We re-enable
1015  * interrupts as much as we can safely do in most places.
1016  */
1017 static int init_irq (ide_hwif_t *hwif)
1018 {
1019         unsigned int index;
1020         ide_hwgroup_t *hwgroup;
1021         ide_hwif_t *match = NULL;
1022
1023
1024         BUG_ON(in_interrupt());
1025         BUG_ON(irqs_disabled());
1026         BUG_ON(hwif == NULL);
1027
1028         down(&ide_cfg_sem);
1029         hwif->hwgroup = NULL;
1030 #if MAX_HWIFS > 1
1031         /*
1032          * Group up with any other hwifs that share our irq(s).
1033          */
1034         for (index = 0; index < MAX_HWIFS; index++) {
1035                 ide_hwif_t *h = &ide_hwifs[index];
1036                 if (h->hwgroup) {  /* scan only initialized hwif's */
1037                         if (hwif->irq == h->irq) {
1038                                 hwif->sharing_irq = h->sharing_irq = 1;
1039                                 if (hwif->chipset != ide_pci ||
1040                                     h->chipset != ide_pci) {
1041                                         save_match(hwif, h, &match);
1042                                 }
1043                         }
1044                         if (hwif->serialized) {
1045                                 if (hwif->mate && hwif->mate->irq == h->irq)
1046                                         save_match(hwif, h, &match);
1047                         }
1048                         if (h->serialized) {
1049                                 if (h->mate && hwif->irq == h->mate->irq)
1050                                         save_match(hwif, h, &match);
1051                         }
1052                 }
1053         }
1054 #endif /* MAX_HWIFS > 1 */
1055         /*
1056          * If we are still without a hwgroup, then form a new one
1057          */
1058         if (match) {
1059                 hwgroup = match->hwgroup;
1060                 hwif->hwgroup = hwgroup;
1061                 /*
1062                  * Link us into the hwgroup.
1063                  * This must be done early, do ensure that unexpected_intr
1064                  * can find the hwif and prevent irq storms.
1065                  * No drives are attached to the new hwif, choose_drive
1066                  * can't do anything stupid (yet).
1067                  * Add ourself as the 2nd entry to the hwgroup->hwif
1068                  * linked list, the first entry is the hwif that owns
1069                  * hwgroup->handler - do not change that.
1070                  */
1071                 spin_lock_irq(&ide_lock);
1072                 hwif->next = hwgroup->hwif->next;
1073                 hwgroup->hwif->next = hwif;
1074                 spin_unlock_irq(&ide_lock);
1075         } else {
1076                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t), GFP_KERNEL,
1077                                         hwif_to_node(hwif->drives[0].hwif));
1078                 if (!hwgroup)
1079                         goto out_up;
1080
1081                 hwif->hwgroup = hwgroup;
1082
1083                 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1084                 hwgroup->hwif     = hwif->next = hwif;
1085                 hwgroup->rq       = NULL;
1086                 hwgroup->handler  = NULL;
1087                 hwgroup->drive    = NULL;
1088                 hwgroup->busy     = 0;
1089                 init_timer(&hwgroup->timer);
1090                 hwgroup->timer.function = &ide_timer_expiry;
1091                 hwgroup->timer.data = (unsigned long) hwgroup;
1092         }
1093
1094         /*
1095          * Allocate the irq, if not already obtained for another hwif
1096          */
1097         if (!match || match->irq != hwif->irq) {
1098                 int sa = IRQF_DISABLED;
1099 #if defined(__mc68000__) || defined(CONFIG_APUS)
1100                 sa = IRQF_SHARED;
1101 #endif /* __mc68000__ || CONFIG_APUS */
1102
1103                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1104                         sa = IRQF_SHARED;
1105 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1106                         sa |= IRQF_DISABLED;
1107 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1108                 }
1109
1110                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1111                         /* clear nIEN */
1112                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1113
1114                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1115                         goto out_unlink;
1116         }
1117
1118         /*
1119          * For any present drive:
1120          * - allocate the block device queue
1121          * - link drive into the hwgroup
1122          */
1123         for (index = 0; index < MAX_DRIVES; ++index) {
1124                 ide_drive_t *drive = &hwif->drives[index];
1125                 if (!drive->present)
1126                         continue;
1127                 if (ide_init_queue(drive)) {
1128                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1129                         continue;
1130                 }
1131                 spin_lock_irq(&ide_lock);
1132                 if (!hwgroup->drive) {
1133                         /* first drive for hwgroup. */
1134                         drive->next = drive;
1135                         hwgroup->drive = drive;
1136                         hwgroup->hwif = HWIF(hwgroup->drive);
1137                 } else {
1138                         drive->next = hwgroup->drive->next;
1139                         hwgroup->drive->next = drive;
1140                 }
1141                 spin_unlock_irq(&ide_lock);
1142         }
1143
1144 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1145         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1146                 hwif->io_ports[IDE_DATA_OFFSET],
1147                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1148                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1149 #else
1150         printk("%s at 0x%08lx on irq %d", hwif->name,
1151                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1152 #endif /* __mc68000__ && CONFIG_APUS */
1153         if (match)
1154                 printk(" (%sed with %s)",
1155                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1156         printk("\n");
1157         up(&ide_cfg_sem);
1158         return 0;
1159 out_unlink:
1160         spin_lock_irq(&ide_lock);
1161         if (hwif->next == hwif) {
1162                 BUG_ON(match);
1163                 BUG_ON(hwgroup->hwif != hwif);
1164                 kfree(hwgroup);
1165         } else {
1166                 ide_hwif_t *g;
1167                 g = hwgroup->hwif;
1168                 while (g->next != hwif)
1169                         g = g->next;
1170                 g->next = hwif->next;
1171                 if (hwgroup->hwif == hwif) {
1172                         /* Impossible. */
1173                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1174                         hwgroup->hwif = g;
1175                 }
1176                 BUG_ON(hwgroup->hwif == hwif);
1177         }
1178         spin_unlock_irq(&ide_lock);
1179 out_up:
1180         up(&ide_cfg_sem);
1181         return 1;
1182 }
1183
1184 static int ata_lock(dev_t dev, void *data)
1185 {
1186         /* FIXME: we want to pin hwif down */
1187         return 0;
1188 }
1189
1190 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1191 {
1192         ide_hwif_t *hwif = data;
1193         int unit = *part >> PARTN_BITS;
1194         ide_drive_t *drive = &hwif->drives[unit];
1195         if (!drive->present)
1196                 return NULL;
1197
1198         if (drive->media == ide_disk)
1199                 request_module("ide-disk");
1200         if (drive->scsi)
1201                 request_module("ide-scsi");
1202         if (drive->media == ide_cdrom || drive->media == ide_optical)
1203                 request_module("ide-cd");
1204         if (drive->media == ide_tape)
1205                 request_module("ide-tape");
1206         if (drive->media == ide_floppy)
1207                 request_module("ide-floppy");
1208
1209         return NULL;
1210 }
1211
1212 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1213 {
1214         struct gendisk *p = data;
1215         *part &= (1 << PARTN_BITS) - 1;
1216         return &p->kobj;
1217 }
1218
1219 static int exact_lock(dev_t dev, void *data)
1220 {
1221         struct gendisk *p = data;
1222
1223         if (!get_disk(p))
1224                 return -1;
1225         return 0;
1226 }
1227
1228 void ide_register_region(struct gendisk *disk)
1229 {
1230         blk_register_region(MKDEV(disk->major, disk->first_minor),
1231                             disk->minors, NULL, exact_match, exact_lock, disk);
1232 }
1233
1234 EXPORT_SYMBOL_GPL(ide_register_region);
1235
1236 void ide_unregister_region(struct gendisk *disk)
1237 {
1238         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1239                               disk->minors);
1240 }
1241
1242 EXPORT_SYMBOL_GPL(ide_unregister_region);
1243
1244 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1245 {
1246         ide_hwif_t *hwif = drive->hwif;
1247         unsigned int unit = (drive->select.all >> 4) & 1;
1248
1249         disk->major = hwif->major;
1250         disk->first_minor = unit << PARTN_BITS;
1251         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1252         disk->queue = drive->queue;
1253 }
1254
1255 EXPORT_SYMBOL_GPL(ide_init_disk);
1256
1257 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1258 {
1259         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1260
1261         if (drive == drive->next) {
1262                 /* special case: last drive from hwgroup. */
1263                 BUG_ON(hwgroup->drive != drive);
1264                 hwgroup->drive = NULL;
1265         } else {
1266                 ide_drive_t *walk;
1267
1268                 walk = hwgroup->drive;
1269                 while (walk->next != drive)
1270                         walk = walk->next;
1271                 walk->next = drive->next;
1272                 if (hwgroup->drive == drive) {
1273                         hwgroup->drive = drive->next;
1274                         hwgroup->hwif = hwgroup->drive->hwif;
1275                 }
1276         }
1277         BUG_ON(hwgroup->drive == drive);
1278 }
1279
1280 static void drive_release_dev (struct device *dev)
1281 {
1282         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1283
1284         spin_lock_irq(&ide_lock);
1285         ide_remove_drive_from_hwgroup(drive);
1286         kfree(drive->id);
1287         drive->id = NULL;
1288         drive->present = 0;
1289         /* Messed up locking ... */
1290         spin_unlock_irq(&ide_lock);
1291         blk_cleanup_queue(drive->queue);
1292         spin_lock_irq(&ide_lock);
1293         drive->queue = NULL;
1294         spin_unlock_irq(&ide_lock);
1295
1296         complete(&drive->gendev_rel_comp);
1297 }
1298
1299 /*
1300  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1301  * after probing for drives, to allocate partition tables and other data
1302  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1303  * somewhat later, during the partition check.
1304  */
1305 static void init_gendisk (ide_hwif_t *hwif)
1306 {
1307         unsigned int unit;
1308
1309         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1310                 ide_drive_t * drive = &hwif->drives[unit];
1311                 ide_add_generic_settings(drive);
1312                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1313                          hwif->index,unit);
1314                 drive->gendev.parent = &hwif->gendev;
1315                 drive->gendev.bus = &ide_bus_type;
1316                 drive->gendev.driver_data = drive;
1317                 drive->gendev.release = drive_release_dev;
1318         }
1319         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1320                         THIS_MODULE, ata_probe, ata_lock, hwif);
1321 }
1322
1323 static int hwif_init(ide_hwif_t *hwif)
1324 {
1325         int old_irq;
1326
1327         /* Return success if no device is connected */
1328         if (!hwif->present)
1329                 return 1;
1330
1331         if (!hwif->irq) {
1332                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1333                 {
1334                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1335                         return (hwif->present = 0);
1336                 }
1337         }
1338 #ifdef CONFIG_BLK_DEV_HD
1339         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1340                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1341                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1342                 return (hwif->present = 0);
1343         }
1344 #endif /* CONFIG_BLK_DEV_HD */
1345
1346         /* we set it back to 1 if all is ok below */
1347         hwif->present = 0;
1348
1349         if (register_blkdev(hwif->major, hwif->name))
1350                 return 0;
1351
1352         if (!hwif->sg_max_nents)
1353                 hwif->sg_max_nents = PRD_ENTRIES;
1354
1355         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1356                                  GFP_KERNEL);
1357         if (!hwif->sg_table) {
1358                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1359                 goto out;
1360         }
1361
1362         if (init_irq(hwif) == 0)
1363                 goto done;
1364
1365         old_irq = hwif->irq;
1366         /*
1367          *      It failed to initialise. Find the default IRQ for
1368          *      this port and try that.
1369          */
1370         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1371                 printk("%s: Disabled unable to get IRQ %d.\n",
1372                         hwif->name, old_irq);
1373                 goto out;
1374         }
1375         if (init_irq(hwif)) {
1376                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1377                         hwif->name, old_irq, hwif->irq);
1378                 goto out;
1379         }
1380         printk("%s: probed IRQ %d failed, using default.\n",
1381                 hwif->name, hwif->irq);
1382
1383 done:
1384         init_gendisk(hwif);
1385
1386         ide_acpi_init(hwif);
1387
1388         hwif->present = 1;      /* success */
1389         return 1;
1390
1391 out:
1392         unregister_blkdev(hwif->major, hwif->name);
1393         return 0;
1394 }
1395
1396 int ideprobe_init (void)
1397 {
1398         unsigned int index;
1399         int probe[MAX_HWIFS];
1400
1401         memset(probe, 0, MAX_HWIFS * sizeof(int));
1402         for (index = 0; index < MAX_HWIFS; ++index)
1403                 probe[index] = !ide_hwifs[index].present;
1404
1405         for (index = 0; index < MAX_HWIFS; ++index)
1406                 if (probe[index])
1407                         probe_hwif(&ide_hwifs[index]);
1408         for (index = 0; index < MAX_HWIFS; ++index)
1409                 if (probe[index])
1410                         hwif_init(&ide_hwifs[index]);
1411         for (index = 0; index < MAX_HWIFS; ++index) {
1412                 if (probe[index]) {
1413                         ide_hwif_t *hwif = &ide_hwifs[index];
1414                         int unit;
1415                         if (!hwif->present)
1416                                 continue;
1417                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1418                                 hwif->chipset = ide_generic;
1419                         for (unit = 0; unit < MAX_DRIVES; ++unit)
1420                                 if (hwif->drives[unit].present) {
1421                                         int ret = device_register(
1422                                                 &hwif->drives[unit].gendev);
1423                                         if (ret < 0)
1424                                                 printk(KERN_WARNING "IDE: %s: "
1425                                                         "device_register error: %d\n",
1426                                                         __FUNCTION__, ret);
1427                                 }
1428                 }
1429         }
1430         for (index = 0; index < MAX_HWIFS; ++index)
1431                 if (probe[index])
1432                         ide_proc_register_port(&ide_hwifs[index]);
1433         return 0;
1434 }
1435
1436 EXPORT_SYMBOL_GPL(ideprobe_init);