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 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
  35
  36 #include <linux/config.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/string.h>
  40 #include <linux/kernel.h>
  41 #include <linux/timer.h>
  42 #include <linux/mm.h>
  43 #include <linux/interrupt.h>
  44 #include <linux/major.h>
  45 #include <linux/errno.h>
  46 #include <linux/genhd.h>
  47 #include <linux/slab.h>
  48 #include <linux/delay.h>
  49 #include <linux/ide.h>
  50 #include <linux/devfs_fs_kernel.h>
  51 #include <linux/spinlock.h>
  52 #include <linux/kmod.h>
  53 #include <linux/pci.h>
  54
  55 #include <asm/byteorder.h>
  56 #include <asm/irq.h>
  57 #include <asm/uaccess.h>
  58 #include <asm/io.h>
  59
  60 /**
  61  *      generic_id              -       add a generic drive id
  62  *      @drive: drive to make an ID block for
  63  *
  64  *      Add a fake id field to the drive we are passed. This allows
  65  *      use to skip a ton of NULL checks (which people always miss)
  66  *      and make drive properties unconditional outside of this file
  67  */
  68
  69 static void generic_id(ide_drive_t *drive)
  70 {
  71         drive->id->cyls = drive->cyl;
  72         drive->id->heads = drive->head;
  73         drive->id->sectors = drive->sect;
  74         drive->id->cur_cyls = drive->cyl;
  75         drive->id->cur_heads = drive->head;
  76         drive->id->cur_sectors = drive->sect;
  77 }
  78
  79 static void ide_disk_init_chs(ide_drive_t *drive)
  80 {
  81         struct hd_driveid *id = drive->id;
  82
  83         /* Extract geometry if we did not already have one for the drive */
  84         if (!drive->cyl || !drive->head || !drive->sect) {
  85                 drive->cyl  = drive->bios_cyl  = id->cyls;
  86                 drive->head = drive->bios_head = id->heads;
  87                 drive->sect = drive->bios_sect = id->sectors;
  88         }
  89
  90         /* Handle logical geometry translation by the drive */
  91         if ((id->field_valid & 1) && id->cur_cyls &&
  92             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
  93                 drive->cyl  = id->cur_cyls;
  94                 drive->head = id->cur_heads;
  95                 drive->sect = id->cur_sectors;
  96         }
  97
  98         /* Use physical geometry if what we have still makes no sense */
  99         if (drive->head > 16 && id->heads && id->heads <= 16) {
 100                 drive->cyl  = id->cyls;
 101                 drive->head = id->heads;
 102                 drive->sect = id->sectors;
 103         }
 104 }
 105
 106 static void ide_disk_init_mult_count(ide_drive_t *drive)
 107 {
 108         struct hd_driveid *id = drive->id;
 109
 110         drive->mult_count = 0;
 111         if (id->max_multsect) {
 112 #ifdef CONFIG_IDEDISK_MULTI_MODE
 113                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
 114                 id->multsect_valid = id->multsect ? 1 : 0;
 115                 drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
 116                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
 117 #else   /* original, pre IDE-NFG, per request of AC */
 118                 drive->mult_req = INITIAL_MULT_COUNT;
 119                 if (drive->mult_req > id->max_multsect)
 120                         drive->mult_req = id->max_multsect;
 121                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
 122                         drive->special.b.set_multmode = 1;
 123 #endif
 124         }
 125 }
 126
 127 /**
 128  *      drive_is_flashcard      -       check for compact flash
 129  *      @drive: drive to check
 130  *
 131  *      CompactFlash cards and their brethern pretend to be removable
 132  *      hard disks, except:
 133  *              (1) they never have a slave unit, and
 134  *              (2) they don't have doorlock mechanisms.
 135  *      This test catches them, and is invoked elsewhere when setting
 136  *      appropriate config bits.
 137  *
 138  *      FIXME: This treatment is probably applicable for *all* PCMCIA (PC CARD)
 139  *      devices, so in linux 2.3.x we should change this to just treat all
 140  *      PCMCIA  drives this way, and get rid of the model-name tests below
 141  *      (too big of an interface change for 2.4.x).
 142  *      At that time, we might also consider parameterizing the timeouts and
 143  *      retries, since these are MUCH faster than mechanical drives. -M.Lord
 144  */
 145
 146 static inline int drive_is_flashcard (ide_drive_t *drive)
 147 {
 148         struct hd_driveid *id = drive->id;
 149
 150         if (drive->removable) {
 151                 if (id->config == 0x848a) return 1;     /* CompactFlash */
 152                 if (!strncmp(id->model, "KODAK ATA_FLASH", 15)  /* Kodak */
 153                  || !strncmp(id->model, "Hitachi CV", 10)       /* Hitachi */
 154                  || !strncmp(id->model, "SunDisk SDCFB", 13)    /* old SanDisk */
 155                  || !strncmp(id->model, "SanDisk SDCFB", 13)    /* SanDisk */
 156                  || !strncmp(id->model, "HAGIWARA HPC", 12)     /* Hagiwara */
 157                  || !strncmp(id->model, "LEXAR ATA_FLASH", 15)  /* Lexar */
 158                  || !strncmp(id->model, "ATA_FLASH", 9))        /* Simple Tech */
 159                 {
 160                         return 1;       /* yes, it is a flash memory card */
 161                 }
 162         }
 163         return 0;       /* no, it is not a flash memory card */
 164 }
 165
 166 /**
 167  *      do_identify     -       identify a drive
 168  *      @drive: drive to identify
 169  *      @cmd: command used
 170  *
 171  *      Called when we have issued a drive identify command to
 172  *      read and parse the results. This function is run with
 173  *      interrupts disabled.
 174  */
 175
 176 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 177 {
 178         ide_hwif_t *hwif = HWIF(drive);
 179         int bswap = 1;
 180         struct hd_driveid *id;
 181
 182         id = drive->id;
 183         /* read 512 bytes of id info */
 184         hwif->ata_input_data(drive, id, SECTOR_WORDS);
 185
 186         drive->id_read = 1;
 187         local_irq_enable();
 188         ide_fix_driveid(id);
 189
 190 #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 191         /*
 192          * EATA SCSI controllers do a hardware ATA emulation:
 193          * Ignore them if there is a driver for them available.
 194          */
 195         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 196             (id->model[0] == 'S' && id->model[1] == 'K')) {
 197                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 198                 goto err_misc;
 199         }
 200 #endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
 201
 202         /*
 203          *  WIN_IDENTIFY returns little-endian info,
 204          *  WIN_PIDENTIFY *usually* returns little-endian info.
 205          */
 206         if (cmd == WIN_PIDENTIFY) {
 207                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 208                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 209                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 210                         /* Vertos drives may still be weird */
 211                         bswap ^= 1;
 212         }
 213         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 214         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 215         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 216
 217         if (strstr(id->model, "E X A B Y T E N E S T"))
 218                 goto err_misc;
 219
 220         /* we depend on this a lot! */
 221         id->model[sizeof(id->model)-1] = '\0';
 222         printk("%s: %s, ", drive->name, id->model);
 223         drive->present = 1;
 224         drive->dead = 0;
 225
 226         /*
 227          * Check for an ATAPI device
 228          */
 229         if (cmd == WIN_PIDENTIFY) {
 230                 u8 type = (id->config >> 8) & 0x1f;
 231                 printk("ATAPI ");
 232                 switch (type) {
 233                         case ide_floppy:
 234                                 if (!strstr(id->model, "CD-ROM")) {
 235                                         if (!strstr(id->model, "oppy") &&
 236                                             !strstr(id->model, "poyp") &&
 237                                             !strstr(id->model, "ZIP"))
 238                                                 printk("cdrom or floppy?, assuming ");
 239                                         if (drive->media != ide_cdrom) {
 240                                                 printk ("FLOPPY");
 241                                                 drive->removable = 1;
 242                                                 break;
 243                                         }
 244                                 }
 245                                 /* Early cdrom models used zero */
 246                                 type = ide_cdrom;
 247                         case ide_cdrom:
 248                                 drive->removable = 1;
 249 #ifdef CONFIG_PPC
 250                                 /* kludge for Apple PowerBook internal zip */
 251                                 if (!strstr(id->model, "CD-ROM") &&
 252                                     strstr(id->model, "ZIP")) {
 253                                         printk ("FLOPPY");
 254                                         type = ide_floppy;
 255                                         break;
 256                                 }
 257 #endif
 258                                 printk ("CD/DVD-ROM");
 259                                 break;
 260                         case ide_tape:
 261                                 printk ("TAPE");
 262                                 break;
 263                         case ide_optical:
 264                                 printk ("OPTICAL");
 265                                 drive->removable = 1;
 266                                 break;
 267                         default:
 268                                 printk("UNKNOWN (type %d)", type);
 269                                 break;
 270                 }
 271                 printk (" drive\n");
 272                 drive->media = type;
 273                 /* an ATAPI device ignores DRDY */
 274                 drive->ready_stat = 0;
 275                 return;
 276         }
 277
 278         /*
 279          * Not an ATAPI device: looks like a "regular" hard disk
 280          */
 281         if (id->config & (1<<7))
 282                 drive->removable = 1;
 283
 284         if (drive_is_flashcard(drive))
 285                 drive->is_flash = 1;
 286         drive->media = ide_disk;
 287         printk("%s DISK drive\n", (drive->is_flash) ? "CFA" : "ATA" );
 288         QUIRK_LIST(drive);
 289         return;
 290
 291 err_misc:
 292         kfree(id);
 293         drive->present = 0;
 294         return;
 295 }
 296
 297 /**
 298  *      actual_try_to_identify  -       send ata/atapi identify
 299  *      @drive: drive to identify
 300  *      @cmd: command to use
 301  *
 302  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 303  *      and waits for a response.  It also monitors irqs while this is
 304  *      happening, in hope of automatically determining which one is
 305  *      being used by the interface.
 306  *
 307  *      Returns:        0  device was identified
 308  *                      1  device timed-out (no response to identify request)
 309  *                      2  device aborted the command (refused to identify itself)
 310  */
 311
 312 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 313 {
 314         ide_hwif_t *hwif = HWIF(drive);
 315         int rc;
 316         unsigned long hd_status;
 317         unsigned long timeout;
 318         u8 s = 0, a = 0;
 319
 320         /* take a deep breath */
 321         msleep(50);
 322
 323         if (IDE_CONTROL_REG) {
 324                 a = hwif->INB(IDE_ALTSTATUS_REG);
 325                 s = hwif->INB(IDE_STATUS_REG);
 326                 if ((a ^ s) & ~INDEX_STAT) {
 327                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 328                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 329                         /* ancient Seagate drives, broken interfaces */
 330                         hd_status = IDE_STATUS_REG;
 331                 } else {
 332                         /* use non-intrusive polling */
 333                         hd_status = IDE_ALTSTATUS_REG;
 334                 }
 335         } else
 336                 hd_status = IDE_STATUS_REG;
 337
 338         /* set features register for atapi
 339          * identify command to be sure of reply
 340          */
 341         if ((cmd == WIN_PIDENTIFY))
 342                 /* disable dma & overlap */
 343                 hwif->OUTB(0, IDE_FEATURE_REG);
 344
 345         /* ask drive for ID */
 346         hwif->OUTB(cmd, IDE_COMMAND_REG);
 347
 348         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 349         timeout += jiffies;
 350         do {
 351                 if (time_after(jiffies, timeout)) {
 352                         /* drive timed-out */
 353                         return 1;
 354                 }
 355                 /* give drive a breather */
 356                 msleep(50);
 357         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 358
 359         /* wait for IRQ and DRQ_STAT */
 360         msleep(50);
 361         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 362                 unsigned long flags;
 363
 364                 /* local CPU only; some systems need this */
 365                 local_irq_save(flags);
 366                 /* drive returned ID */
 367                 do_identify(drive, cmd);
 368                 /* drive responded with ID */
 369                 rc = 0;
 370                 /* clear drive IRQ */
 371                 (void) hwif->INB(IDE_STATUS_REG);
 372                 local_irq_restore(flags);
 373         } else {
 374                 /* drive refused ID */
 375                 rc = 2;
 376         }
 377         return rc;
 378 }
 379
 380 /**
 381  *      try_to_identify -       try to identify a drive
 382  *      @drive: drive to probe
 383  *      @cmd: command to use
 384  *
 385  *      Issue the identify command and then do IRQ probing to
 386  *      complete the identification when needed by finding the
 387  *      IRQ the drive is attached to
 388  */
 389
 390 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 391 {
 392         ide_hwif_t *hwif = HWIF(drive);
 393         int retval;
 394         int autoprobe = 0;
 395         unsigned long cookie = 0;
 396
 397         /*
 398          * Disable device irq unless we need to
 399          * probe for it. Otherwise we'll get spurious
 400          * interrupts during the identify-phase that
 401          * the irq handler isn't expecting.
 402          */
 403         if (IDE_CONTROL_REG) {
 404                 u8 ctl = drive->ctl | 2;
 405                 if (!hwif->irq) {
 406                         autoprobe = 1;
 407                         cookie = probe_irq_on();
 408                         /* enable device irq */
 409                         ctl &= ~2;
 410                 }
 411                 hwif->OUTB(ctl, IDE_CONTROL_REG);
 412         }
 413
 414         retval = actual_try_to_identify(drive, cmd);
 415
 416         if (autoprobe) {
 417                 int irq;
 418                 /* mask device irq */
 419                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 420                 /* clear drive IRQ */
 421                 (void) hwif->INB(IDE_STATUS_REG);
 422                 udelay(5);
 423                 irq = probe_irq_off(cookie);
 424                 if (!hwif->irq) {
 425                         if (irq > 0) {
 426                                 hwif->irq = irq;
 427                         } else {
 428                                 /* Mmmm.. multiple IRQs..
 429                                  * don't know which was ours
 430                                  */
 431                                 printk("%s: IRQ probe failed (0x%lx)\n",
 432                                         drive->name, cookie);
 433                         }
 434                 }
 435         }
 436         return retval;
 437 }
 438
 439
 440 /**
 441  *      do_probe                -       probe an IDE device
 442  *      @drive: drive to probe
 443  *      @cmd: command to use
 444  *
 445  *      do_probe() has the difficult job of finding a drive if it exists,
 446  *      without getting hung up if it doesn't exist, without trampling on
 447  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 448  *
 449  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 450  *      but does not respond right away, the probe will "hang in there"
 451  *      for the maximum wait time (about 30 seconds), otherwise it will
 452  *      exit much more quickly.
 453  *
 454  * Returns:     0  device was identified
 455  *              1  device timed-out (no response to identify request)
 456  *              2  device aborted the command (refused to identify itself)
 457  *              3  bad status from device (possible for ATAPI drives)
 458  *              4  probe was not attempted because failure was obvious
 459  */
 460
 461 static int do_probe (ide_drive_t *drive, u8 cmd)
 462 {
 463         int rc;
 464         ide_hwif_t *hwif = HWIF(drive);
 465
 466         if (drive->present) {
 467                 /* avoid waiting for inappropriate probes */
 468                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 469                         return 4;
 470         }
 471 #ifdef DEBUG
 472         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 473                 drive->name, drive->present, drive->media,
 474                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 475 #endif
 476
 477         /* needed for some systems
 478          * (e.g. crw9624 as drive0 with disk as slave)
 479          */
 480         msleep(50);
 481         SELECT_DRIVE(drive);
 482         msleep(50);
 483         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 484                 if (drive->select.b.unit != 0) {
 485                         /* exit with drive0 selected */
 486                         SELECT_DRIVE(&hwif->drives[0]);
 487                         /* allow BUSY_STAT to assert & clear */
 488                         msleep(50);
 489                 }
 490                 /* no i/f present: mmm.. this should be a 4 -ml */
 491                 return 3;
 492         }
 493
 494         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 495             drive->present || cmd == WIN_PIDENTIFY) {
 496                 /* send cmd and wait */
 497                 if ((rc = try_to_identify(drive, cmd))) {
 498                         /* failed: try again */
 499                         rc = try_to_identify(drive,cmd);
 500                 }
 501                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 502                         return 4;
 503
 504                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 505                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 506                         (drive->autotune == IDE_TUNE_AUTO))) {
 507                         unsigned long timeout;
 508                         printk("%s: no response (status = 0x%02x), "
 509                                 "resetting drive\n", drive->name,
 510                                 hwif->INB(IDE_STATUS_REG));
 511                         msleep(50);
 512                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 513                         msleep(50);
 514                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 515                         timeout = jiffies;
 516                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
 517                                time_before(jiffies, timeout + WAIT_WORSTCASE))
 518                                 msleep(50);
 519                         rc = try_to_identify(drive, cmd);
 520                 }
 521                 if (rc == 1)
 522                         printk("%s: no response (status = 0x%02x)\n",
 523                                 drive->name, hwif->INB(IDE_STATUS_REG));
 524                 /* ensure drive irq is clear */
 525                 (void) hwif->INB(IDE_STATUS_REG);
 526         } else {
 527                 /* not present or maybe ATAPI */
 528                 rc = 3;
 529         }
 530         if (drive->select.b.unit != 0) {
 531                 /* exit with drive0 selected */
 532                 SELECT_DRIVE(&hwif->drives[0]);
 533                 msleep(50);
 534                 /* ensure drive irq is clear */
 535                 (void) hwif->INB(IDE_STATUS_REG);
 536         }
 537         return rc;
 538 }
 539
 540 /*
 541  *
 542  */
 543 static void enable_nest (ide_drive_t *drive)
 544 {
 545         ide_hwif_t *hwif = HWIF(drive);
 546         unsigned long timeout;
 547
 548         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 549         SELECT_DRIVE(drive);
 550         msleep(50);
 551         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 552         timeout = jiffies + WAIT_WORSTCASE;
 553         do {
 554                 if (time_after(jiffies, timeout)) {
 555                         printk("failed (timeout)\n");
 556                         return;
 557                 }
 558                 msleep(50);
 559         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 560
 561         msleep(50);
 562
 563         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 564                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 565         } else {
 566                 printk("success\n");
 567         }
 568
 569         /* if !(success||timed-out) */
 570         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 571                 /* look for ATAPI device */
 572                 (void) do_probe(drive, WIN_PIDENTIFY);
 573         }
 574 }
 575
 576 /**
 577  *      probe_for_drives        -       upper level drive probe
 578  *      @drive: drive to probe for
 579  *
 580  *      probe_for_drive() tests for existence of a given drive using do_probe()
 581  *      and presents things to the user as needed.
 582  *
 583  *      Returns:        0  no device was found
 584  *                      1  device was found (note: drive->present might
 585  *                         still be 0)
 586  */
 587
 588 static inline u8 probe_for_drive (ide_drive_t *drive)
 589 {
 590         /*
 591          *      In order to keep things simple we have an id
 592          *      block for all drives at all times. If the device
 593          *      is pre ATA or refuses ATA/ATAPI identify we
 594          *      will add faked data to this.
 595          *
 596          *      Also note that 0 everywhere means "can't do X"
 597          */
 598
 599         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 600         drive->id_read = 0;
 601         if(drive->id == NULL)
 602         {
 603                 printk(KERN_ERR "ide: out of memory for id data.\n");
 604                 return 0;
 605         }
 606         strcpy(drive->id->model, "UNKNOWN");
 607
 608         /* skip probing? */
 609         if (!drive->noprobe)
 610         {
 611                 /* if !(success||timed-out) */
 612                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 613                         /* look for ATAPI device */
 614                         (void) do_probe(drive, WIN_PIDENTIFY);
 615                 }
 616                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 617                         enable_nest(drive);
 618                 if (!drive->present)
 619                         /* drive not found */
 620                         return 0;
 621
 622                 /* identification failed? */
 623                 if (!drive->id_read) {
 624                         if (drive->media == ide_disk) {
 625                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 626                                         drive->name, drive->cyl,
 627                                         drive->head, drive->sect);
 628                         } else if (drive->media == ide_cdrom) {
 629                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 630                         } else {
 631                                 /* nuke it */
 632                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 633                                 drive->present = 0;
 634                         }
 635                 }
 636                 /* drive was found */
 637         }
 638         if(!drive->present)
 639                 return 0;
 640         /* The drive wasn't being helpful. Add generic info only */
 641         if (drive->id_read == 0) {
 642                 generic_id(drive);
 643                 return 1;
 644         }
 645
 646         if (drive->media == ide_disk) {
 647                 ide_disk_init_chs(drive);
 648                 ide_disk_init_mult_count(drive);
 649         }
 650
 651         return drive->present;
 652 }
 653
 654 static void hwif_release_dev (struct device *dev)
 655 {
 656         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 657
 658         up(&hwif->gendev_rel_sem);
 659 }
 660
 661 static void hwif_register (ide_hwif_t *hwif)
 662 {
 663         /* register with global device tree */
 664         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 665         hwif->gendev.driver_data = hwif;
 666         if (hwif->gendev.parent == NULL) {
 667                 if (hwif->pci_dev)
 668                         hwif->gendev.parent = &hwif->pci_dev->dev;
 669                 else
 670                         /* Would like to do = &device_legacy */
 671                         hwif->gendev.parent = NULL;
 672         }
 673         hwif->gendev.release = hwif_release_dev;
 674         device_register(&hwif->gendev);
 675 }
 676
 677 static int wait_hwif_ready(ide_hwif_t *hwif)
 678 {
 679         int rc;
 680
 681         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 682
 683         /* Let HW settle down a bit from whatever init state we
 684          * come from */
 685         mdelay(2);
 686
 687         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 688          * I know of at least one disk who takes 31 seconds, I use 35
 689          * here to be safe
 690          */
 691         rc = ide_wait_not_busy(hwif, 35000);
 692         if (rc)
 693                 return rc;
 694
 695         /* Now make sure both master & slave are ready */
 696         SELECT_DRIVE(&hwif->drives[0]);
 697         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 698         mdelay(2);
 699         rc = ide_wait_not_busy(hwif, 35000);
 700         if (rc)
 701                 return rc;
 702         SELECT_DRIVE(&hwif->drives[1]);
 703         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 704         mdelay(2);
 705         rc = ide_wait_not_busy(hwif, 35000);
 706
 707         /* Exit function with master reselected (let's be sane) */
 708         SELECT_DRIVE(&hwif->drives[0]);
 709
 710         return rc;
 711 }
 712
 713 /**
 714  *      ide_undecoded_slave     -       look for bad CF adapters
 715  *      @hwif: interface
 716  *
 717  *      Analyse the drives on the interface and attempt to decide if we
 718  *      have the same drive viewed twice. This occurs with crap CF adapters
 719  *      and PCMCIA sometimes.
 720  */
 721
 722 void ide_undecoded_slave(ide_hwif_t *hwif)
 723 {
 724         ide_drive_t *drive0 = &hwif->drives[0];
 725         ide_drive_t *drive1 = &hwif->drives[1];
 726
 727         if (drive0->present == 0 || drive1->present == 0)
 728                 return;
 729
 730         /* If the models don't match they are not the same product */
 731         if (strcmp(drive0->id->model, drive1->id->model))
 732                 return;
 733
 734         /* Serial numbers do not match */
 735         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 736                 return;
 737
 738         /* No serial number, thankfully very rare for CF */
 739         if (drive0->id->serial_no[0] == 0)
 740                 return;
 741
 742         /* Appears to be an IDE flash adapter with decode bugs */
 743         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 744
 745         drive1->present = 0;
 746 }
 747
 748 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 749
 750 /*
 751  * This routine only knows how to look for drive units 0 and 1
 752  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 753  */
 754 static void probe_hwif(ide_hwif_t *hwif)
 755 {
 756         unsigned int unit;
 757         unsigned long flags;
 758         unsigned int irqd;
 759
 760         if (hwif->noprobe)
 761                 return;
 762
 763         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 764             (ide_hwif_request_regions(hwif))) {
 765                 u16 msgout = 0;
 766                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 767                         ide_drive_t *drive = &hwif->drives[unit];
 768                         if (drive->present) {
 769                                 drive->present = 0;
 770                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 771                                         drive->name);
 772                                 msgout = 1;
 773                         }
 774                 }
 775                 if (!msgout)
 776                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 777                                 hwif->name);
 778                 return;
 779         }
 780
 781         /*
 782          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 783          * we'll install our IRQ driver much later...
 784          */
 785         irqd = hwif->irq;
 786         if (irqd)
 787                 disable_irq(hwif->irq);
 788
 789         local_irq_set(flags);
 790
 791         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 792          * platforms. Typical cases are:
 793          *
 794          *  - The firmware hard reset the disk before booting the kernel,
 795          *    the drive is still doing it's poweron-reset sequence, that
 796          *    can take up to 30 seconds
 797          *  - The firmware does nothing (or no firmware), the device is
 798          *    still in POST state (same as above actually).
 799          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 800          *    their reset sequence even when they are non-selected slave
 801          *    devices, thus preventing discovery of the main HD
 802          *
 803          *  Doing this wait-for-busy should not harm any existing configuration
 804          *  (at least things won't be worse than what current code does, that
 805          *  is blindly go & talk to the drive) and fix some issues like the
 806          *  above.
 807          *
 808          *  BenH.
 809          */
 810         if (wait_hwif_ready(hwif) == -EBUSY)
 811                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 812
 813         /*
 814          * Second drive should only exist if first drive was found,
 815          * but a lot of cdrom drives are configured as single slaves.
 816          */
 817         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 818                 ide_drive_t *drive = &hwif->drives[unit];
 819                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 820                 (void) probe_for_drive(drive);
 821                 if (drive->present && !hwif->present) {
 822                         hwif->present = 1;
 823                         if (hwif->chipset != ide_4drives ||
 824                             !hwif->mate ||
 825                             !hwif->mate->present) {
 826                                 hwif_register(hwif);
 827                         }
 828                 }
 829         }
 830         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 831                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 832                 u8 stat;
 833
 834                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 835                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 836                 udelay(10);
 837                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 838                 do {
 839                         msleep(50);
 840                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 841                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 842
 843         }
 844         local_irq_restore(flags);
 845         /*
 846          * Use cached IRQ number. It might be (and is...) changed by probe
 847          * code above
 848          */
 849         if (irqd)
 850                 enable_irq(irqd);
 851
 852         if (!hwif->present) {
 853                 ide_hwif_release_regions(hwif);
 854                 return;
 855         }
 856
 857         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 858                 ide_drive_t *drive = &hwif->drives[unit];
 859
 860                 if (drive->present) {
 861                         if (hwif->tuneproc != NULL &&
 862                                 drive->autotune == IDE_TUNE_AUTO)
 863                                 /* auto-tune PIO mode */
 864                                 hwif->tuneproc(drive, 255);
 865
 866                         if (drive->autotune != IDE_TUNE_DEFAULT &&
 867                             drive->autotune != IDE_TUNE_AUTO)
 868                                 continue;
 869
 870                         drive->nice1 = 1;
 871
 872                         /*
 873                          * MAJOR HACK BARF :-/
 874                          *
 875                          * FIXME: chipsets own this cruft!
 876                          */
 877                         /*
 878                          * Move here to prevent module loading clashing.
 879                          */
 880         //              drive->autodma = hwif->autodma;
 881                         if (hwif->ide_dma_check) {
 882                                 /*
 883                                  * Force DMAing for the beginning of the check.
 884                                  * Some chipsets appear to do interesting
 885                                  * things, if not checked and cleared.
 886                                  *   PARANOIA!!!
 887                                  */
 888                                 hwif->ide_dma_off_quietly(drive);
 889 #ifdef CONFIG_IDEDMA_ONLYDISK
 890                                 if (drive->media == ide_disk)
 891 #endif
 892                                         hwif->ide_dma_check(drive);
 893                         }
 894                 }
 895         }
 896 }
 897
 898 static int hwif_init(ide_hwif_t *hwif);
 899
 900 int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
 901 {
 902         probe_hwif(hwif);
 903
 904         if (fixup)
 905                 fixup(hwif);
 906
 907         if (!hwif_init(hwif)) {
 908                 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
 909                                  hwif->name);
 910                 return -1;
 911         }
 912
 913         if (hwif->present) {
 914                 u16 unit = 0;
 915                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 916                         ide_drive_t *drive = &hwif->drives[unit];
 917                         /* For now don't attach absent drives, we may
 918                            want them on default or a new "empty" class
 919                            for hotplug reprobing ? */
 920                         if (drive->present) {
 921                                 device_register(&drive->gendev);
 922                         }
 923                 }
 924         }
 925         return 0;
 926 }
 927
 928 int probe_hwif_init(ide_hwif_t *hwif)
 929 {
 930         return probe_hwif_init_with_fixup(hwif, NULL);
 931 }
 932
 933 EXPORT_SYMBOL(probe_hwif_init);
 934
 935 #if MAX_HWIFS > 1
 936 /*
 937  * save_match() is used to simplify logic in init_irq() below.
 938  *
 939  * A loophole here is that we may not know about a particular
 940  * hwif's irq until after that hwif is actually probed/initialized..
 941  * This could be a problem for the case where an hwif is on a
 942  * dual interface that requires serialization (eg. cmd640) and another
 943  * hwif using one of the same irqs is initialized beforehand.
 944  *
 945  * This routine detects and reports such situations, but does not fix them.
 946  */
 947 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 948 {
 949         ide_hwif_t *m = *match;
 950
 951         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 952                 if (!new->hwgroup)
 953                         return;
 954                 printk("%s: potential irq problem with %s and %s\n",
 955                         hwif->name, new->name, m->name);
 956         }
 957         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 958                 *match = new;
 959 }
 960 #endif /* MAX_HWIFS > 1 */
 961
 962 /*
 963  * init request queue
 964  */
 965 static int ide_init_queue(ide_drive_t *drive)
 966 {
 967         request_queue_t *q;
 968         ide_hwif_t *hwif = HWIF(drive);
 969         int max_sectors = 256;
 970         int max_sg_entries = PRD_ENTRIES;
 971
 972         /*
 973          *      Our default set up assumes the normal IDE case,
 974          *      that is 64K segmenting, standard PRD setup
 975          *      and LBA28. Some drivers then impose their own
 976          *      limits and LBA48 we could raise it but as yet
 977          *      do not.
 978          */
 979
 980         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 981         if (!q)
 982                 return 1;
 983
 984         q->queuedata = drive;
 985         blk_queue_segment_boundary(q, 0xffff);
 986
 987         if (!hwif->rqsize) {
 988                 if (hwif->no_lba48 || hwif->no_lba48_dma)
 989                         hwif->rqsize = 256;
 990                 else
 991                         hwif->rqsize = 65536;
 992         }
 993         if (hwif->rqsize < max_sectors)
 994                 max_sectors = hwif->rqsize;
 995         blk_queue_max_sectors(q, max_sectors);
 996
 997 #ifdef CONFIG_PCI
 998         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 999          * creates segments that don't completely match our boundary
1000          * requirements and thus need to be broken up again. Because it
1001          * doesn't align properly either, we may actually have to break up
1002          * to more segments than what was we got in the first place, a max
1003          * worst case is twice as many.
1004          * This will be fixed once we teach pci_map_sg() about our boundary
1005          * requirements, hopefully soon. *FIXME*
1006          */
1007         if (!PCI_DMA_BUS_IS_PHYS)
1008                 max_sg_entries >>= 1;
1009 #endif /* CONFIG_PCI */
1010
1011         blk_queue_max_hw_segments(q, max_sg_entries);
1012         blk_queue_max_phys_segments(q, max_sg_entries);
1013
1014         /* assign drive queue */
1015         drive->queue = q;
1016
1017         /* needs drive->queue to be set */
1018         ide_toggle_bounce(drive, 1);
1019
1020         /* enable led activity for disk drives only */
1021         if (drive->media == ide_disk && hwif->led_act)
1022                 blk_queue_activity_fn(q, hwif->led_act, drive);
1023
1024         return 0;
1025 }
1026
1027 /*
1028  * This routine sets up the irq for an ide interface, and creates a new
1029  * hwgroup for the irq/hwif if none was previously assigned.
1030  *
1031  * Much of the code is for correctly detecting/handling irq sharing
1032  * and irq serialization situations.  This is somewhat complex because
1033  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1034  *
1035  * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
1036  * interrupts completely disabled.  This can be bad for interrupt latency,
1037  * but anything else has led to problems on some machines.  We re-enable
1038  * interrupts as much as we can safely do in most places.
1039  */
1040 static int init_irq (ide_hwif_t *hwif)
1041 {
1042         unsigned int index;
1043         ide_hwgroup_t *hwgroup;
1044         ide_hwif_t *match = NULL;
1045
1046
1047         BUG_ON(in_interrupt());
1048         BUG_ON(irqs_disabled());
1049         BUG_ON(hwif == NULL);
1050
1051         down(&ide_cfg_sem);
1052         hwif->hwgroup = NULL;
1053 #if MAX_HWIFS > 1
1054         /*
1055          * Group up with any other hwifs that share our irq(s).
1056          */
1057         for (index = 0; index < MAX_HWIFS; index++) {
1058                 ide_hwif_t *h = &ide_hwifs[index];
1059                 if (h->hwgroup) {  /* scan only initialized hwif's */
1060                         if (hwif->irq == h->irq) {
1061                                 hwif->sharing_irq = h->sharing_irq = 1;
1062                                 if (hwif->chipset != ide_pci ||
1063                                     h->chipset != ide_pci) {
1064                                         save_match(hwif, h, &match);
1065                                 }
1066                         }
1067                         if (hwif->serialized) {
1068                                 if (hwif->mate && hwif->mate->irq == h->irq)
1069                                         save_match(hwif, h, &match);
1070                         }
1071                         if (h->serialized) {
1072                                 if (h->mate && hwif->irq == h->mate->irq)
1073                                         save_match(hwif, h, &match);
1074                         }
1075                 }
1076         }
1077 #endif /* MAX_HWIFS > 1 */
1078         /*
1079          * If we are still without a hwgroup, then form a new one
1080          */
1081         if (match) {
1082                 hwgroup = match->hwgroup;
1083                 hwif->hwgroup = hwgroup;
1084                 /*
1085                  * Link us into the hwgroup.
1086                  * This must be done early, do ensure that unexpected_intr
1087                  * can find the hwif and prevent irq storms.
1088                  * No drives are attached to the new hwif, choose_drive
1089                  * can't do anything stupid (yet).
1090                  * Add ourself as the 2nd entry to the hwgroup->hwif
1091                  * linked list, the first entry is the hwif that owns
1092                  * hwgroup->handler - do not change that.
1093                  */
1094                 spin_lock_irq(&ide_lock);
1095                 hwif->next = hwgroup->hwif->next;
1096                 hwgroup->hwif->next = hwif;
1097                 spin_unlock_irq(&ide_lock);
1098         } else {
1099                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t), GFP_KERNEL,
1100                                         hwif_to_node(hwif->drives[0].hwif));
1101                 if (!hwgroup)
1102                         goto out_up;
1103
1104                 hwif->hwgroup = hwgroup;
1105
1106                 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1107                 hwgroup->hwif     = hwif->next = hwif;
1108                 hwgroup->rq       = NULL;
1109                 hwgroup->handler  = NULL;
1110                 hwgroup->drive    = NULL;
1111                 hwgroup->busy     = 0;
1112                 init_timer(&hwgroup->timer);
1113                 hwgroup->timer.function = &ide_timer_expiry;
1114                 hwgroup->timer.data = (unsigned long) hwgroup;
1115         }
1116
1117         /*
1118          * Allocate the irq, if not already obtained for another hwif
1119          */
1120         if (!match || match->irq != hwif->irq) {
1121                 int sa = SA_INTERRUPT;
1122 #if defined(__mc68000__) || defined(CONFIG_APUS)
1123                 sa = SA_SHIRQ;
1124 #endif /* __mc68000__ || CONFIG_APUS */
1125
1126                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1127                         sa = SA_SHIRQ;
1128 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1129                         sa |= SA_INTERRUPT;
1130 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1131                 }
1132
1133                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1134                         /* clear nIEN */
1135                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1136
1137                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1138                         goto out_unlink;
1139         }
1140
1141         /*
1142          * For any present drive:
1143          * - allocate the block device queue
1144          * - link drive into the hwgroup
1145          */
1146         for (index = 0; index < MAX_DRIVES; ++index) {
1147                 ide_drive_t *drive = &hwif->drives[index];
1148                 if (!drive->present)
1149                         continue;
1150                 if (ide_init_queue(drive)) {
1151                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1152                         continue;
1153                 }
1154                 spin_lock_irq(&ide_lock);
1155                 if (!hwgroup->drive) {
1156                         /* first drive for hwgroup. */
1157                         drive->next = drive;
1158                         hwgroup->drive = drive;
1159                         hwgroup->hwif = HWIF(hwgroup->drive);
1160                 } else {
1161                         drive->next = hwgroup->drive->next;
1162                         hwgroup->drive->next = drive;
1163                 }
1164                 spin_unlock_irq(&ide_lock);
1165         }
1166
1167 #if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
1168         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1169                 hwif->io_ports[IDE_DATA_OFFSET],
1170                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1171                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1172 #elif defined(__sparc__)
1173         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
1174                 hwif->io_ports[IDE_DATA_OFFSET],
1175                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1176                 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
1177 #else
1178         printk("%s at 0x%08lx on irq %d", hwif->name,
1179                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1180 #endif /* __mc68000__ && CONFIG_APUS */
1181         if (match)
1182                 printk(" (%sed with %s)",
1183                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1184         printk("\n");
1185         up(&ide_cfg_sem);
1186         return 0;
1187 out_unlink:
1188         spin_lock_irq(&ide_lock);
1189         if (hwif->next == hwif) {
1190                 BUG_ON(match);
1191                 BUG_ON(hwgroup->hwif != hwif);
1192                 kfree(hwgroup);
1193         } else {
1194                 ide_hwif_t *g;
1195                 g = hwgroup->hwif;
1196                 while (g->next != hwif)
1197                         g = g->next;
1198                 g->next = hwif->next;
1199                 if (hwgroup->hwif == hwif) {
1200                         /* Impossible. */
1201                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1202                         hwgroup->hwif = g;
1203                 }
1204                 BUG_ON(hwgroup->hwif == hwif);
1205         }
1206         spin_unlock_irq(&ide_lock);
1207 out_up:
1208         up(&ide_cfg_sem);
1209         return 1;
1210 }
1211
1212 static int ata_lock(dev_t dev, void *data)
1213 {
1214         /* FIXME: we want to pin hwif down */
1215         return 0;
1216 }
1217
1218 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1219 {
1220         ide_hwif_t *hwif = data;
1221         int unit = *part >> PARTN_BITS;
1222         ide_drive_t *drive = &hwif->drives[unit];
1223         if (!drive->present)
1224                 return NULL;
1225
1226         if (drive->media == ide_disk)
1227                 request_module("ide-disk");
1228         if (drive->scsi)
1229                 request_module("ide-scsi");
1230         if (drive->media == ide_cdrom || drive->media == ide_optical)
1231                 request_module("ide-cd");
1232         if (drive->media == ide_tape)
1233                 request_module("ide-tape");
1234         if (drive->media == ide_floppy)
1235                 request_module("ide-floppy");
1236
1237         return NULL;
1238 }
1239
1240 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1241 {
1242         struct gendisk *p = data;
1243         *part &= (1 << PARTN_BITS) - 1;
1244         return &p->kobj;
1245 }
1246
1247 static int exact_lock(dev_t dev, void *data)
1248 {
1249         struct gendisk *p = data;
1250
1251         if (!get_disk(p))
1252                 return -1;
1253         return 0;
1254 }
1255
1256 void ide_register_region(struct gendisk *disk)
1257 {
1258         blk_register_region(MKDEV(disk->major, disk->first_minor),
1259                             disk->minors, NULL, exact_match, exact_lock, disk);
1260 }
1261
1262 EXPORT_SYMBOL_GPL(ide_register_region);
1263
1264 void ide_unregister_region(struct gendisk *disk)
1265 {
1266         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1267                               disk->minors);
1268 }
1269
1270 EXPORT_SYMBOL_GPL(ide_unregister_region);
1271
1272 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1273 {
1274         ide_hwif_t *hwif = drive->hwif;
1275         unsigned int unit = (drive->select.all >> 4) & 1;
1276
1277         disk->major = hwif->major;
1278         disk->first_minor = unit << PARTN_BITS;
1279         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1280         disk->queue = drive->queue;
1281 }
1282
1283 EXPORT_SYMBOL_GPL(ide_init_disk);
1284
1285 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1286 {
1287         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1288
1289         if (drive == drive->next) {
1290                 /* special case: last drive from hwgroup. */
1291                 BUG_ON(hwgroup->drive != drive);
1292                 hwgroup->drive = NULL;
1293         } else {
1294                 ide_drive_t *walk;
1295
1296                 walk = hwgroup->drive;
1297                 while (walk->next != drive)
1298                         walk = walk->next;
1299                 walk->next = drive->next;
1300                 if (hwgroup->drive == drive) {
1301                         hwgroup->drive = drive->next;
1302                         hwgroup->hwif = hwgroup->drive->hwif;
1303                 }
1304         }
1305         BUG_ON(hwgroup->drive == drive);
1306 }
1307
1308 static void drive_release_dev (struct device *dev)
1309 {
1310         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1311
1312         spin_lock_irq(&ide_lock);
1313         if (drive->devfs_name[0] != '\0') {
1314                 devfs_remove(drive->devfs_name);
1315                 drive->devfs_name[0] = '\0';
1316         }
1317         ide_remove_drive_from_hwgroup(drive);
1318         kfree(drive->id);
1319         drive->id = NULL;
1320         drive->present = 0;
1321         /* Messed up locking ... */
1322         spin_unlock_irq(&ide_lock);
1323         blk_cleanup_queue(drive->queue);
1324         spin_lock_irq(&ide_lock);
1325         drive->queue = NULL;
1326         spin_unlock_irq(&ide_lock);
1327
1328         up(&drive->gendev_rel_sem);
1329 }
1330
1331 /*
1332  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1333  * after probing for drives, to allocate partition tables and other data
1334  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1335  * somewhat later, during the partition check.
1336  */
1337 static void init_gendisk (ide_hwif_t *hwif)
1338 {
1339         unsigned int unit;
1340
1341         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1342                 ide_drive_t * drive = &hwif->drives[unit];
1343                 ide_add_generic_settings(drive);
1344                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1345                          hwif->index,unit);
1346                 drive->gendev.parent = &hwif->gendev;
1347                 drive->gendev.bus = &ide_bus_type;
1348                 drive->gendev.driver_data = drive;
1349                 drive->gendev.release = drive_release_dev;
1350                 if (drive->present) {
1351                         sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
1352                                 (hwif->channel && hwif->mate) ?
1353                                 hwif->mate->index : hwif->index,
1354                                 hwif->channel, unit, drive->lun);
1355                 }
1356         }
1357         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1358                         THIS_MODULE, ata_probe, ata_lock, hwif);
1359 }
1360
1361 static int hwif_init(ide_hwif_t *hwif)
1362 {
1363         int old_irq;
1364
1365         /* Return success if no device is connected */
1366         if (!hwif->present)
1367                 return 1;
1368
1369         if (!hwif->irq) {
1370                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1371                 {
1372                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1373                         return (hwif->present = 0);
1374                 }
1375         }
1376 #ifdef CONFIG_BLK_DEV_HD
1377         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1378                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1379                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1380                 return (hwif->present = 0);
1381         }
1382 #endif /* CONFIG_BLK_DEV_HD */
1383
1384         /* we set it back to 1 if all is ok below */
1385         hwif->present = 0;
1386
1387         if (register_blkdev(hwif->major, hwif->name))
1388                 return 0;
1389
1390         if (!hwif->sg_max_nents)
1391                 hwif->sg_max_nents = PRD_ENTRIES;
1392
1393         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1394                                  GFP_KERNEL);
1395         if (!hwif->sg_table) {
1396                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1397                 goto out;
1398         }
1399
1400         if (init_irq(hwif) == 0)
1401                 goto done;
1402
1403         old_irq = hwif->irq;
1404         /*
1405          *      It failed to initialise. Find the default IRQ for
1406          *      this port and try that.
1407          */
1408         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1409                 printk("%s: Disabled unable to get IRQ %d.\n",
1410                         hwif->name, old_irq);
1411                 goto out;
1412         }
1413         if (init_irq(hwif)) {
1414                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1415                         hwif->name, old_irq, hwif->irq);
1416                 goto out;
1417         }
1418         printk("%s: probed IRQ %d failed, using default.\n",
1419                 hwif->name, hwif->irq);
1420
1421 done:
1422         init_gendisk(hwif);
1423         hwif->present = 1;      /* success */
1424         return 1;
1425
1426 out:
1427         unregister_blkdev(hwif->major, hwif->name);
1428         return 0;
1429 }
1430
1431 int ideprobe_init (void)
1432 {
1433         unsigned int index;
1434         int probe[MAX_HWIFS];
1435
1436         memset(probe, 0, MAX_HWIFS * sizeof(int));
1437         for (index = 0; index < MAX_HWIFS; ++index)
1438                 probe[index] = !ide_hwifs[index].present;
1439
1440         for (index = 0; index < MAX_HWIFS; ++index)
1441                 if (probe[index])
1442                         probe_hwif(&ide_hwifs[index]);
1443         for (index = 0; index < MAX_HWIFS; ++index)
1444                 if (probe[index])
1445                         hwif_init(&ide_hwifs[index]);
1446         for (index = 0; index < MAX_HWIFS; ++index) {
1447                 if (probe[index]) {
1448                         ide_hwif_t *hwif = &ide_hwifs[index];
1449                         int unit;
1450                         if (!hwif->present)
1451                                 continue;
1452                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1453                                 hwif->chipset = ide_generic;
1454                         for (unit = 0; unit < MAX_DRIVES; ++unit)
1455                                 if (hwif->drives[unit].present)
1456                                         device_register(&hwif->drives[unit].gendev);
1457                 }
1458         }
1459         return 0;
1460 }
1461
1462 EXPORT_SYMBOL_GPL(ideprobe_init);