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/spinlock.h>
  51 #include <linux/pci.h>
  52 #include <linux/kmod.h>
  53
  54 #include <asm/byteorder.h>
  55 #include <asm/irq.h>
  56 #include <asm/uaccess.h>
  57 #include <asm/io.h>
  58
  59 /**
  60  *      generic_id              -       add a generic drive id
  61  *      @drive: drive to make an ID block for
  62  *
  63  *      Add a fake id field to the drive we are passed. This allows
  64  *      use to skip a ton of NULL checks (which people always miss)
  65  *      and make drive properties unconditional outside of this file
  66  */
  67
  68 static void generic_id(ide_drive_t *drive)
  69 {
  70         drive->id->cyls = drive->cyl;
  71         drive->id->heads = drive->head;
  72         drive->id->sectors = drive->sect;
  73         drive->id->cur_cyls = drive->cyl;
  74         drive->id->cur_heads = drive->head;
  75         drive->id->cur_sectors = drive->sect;
  76 }
  77
  78 /**
  79  *      drive_is_flashcard      -       check for compact flash
  80  *      @drive: drive to check
  81  *
  82  *      CompactFlash cards and their brethern pretend to be removable
  83  *      hard disks, except:
  84  *              (1) they never have a slave unit, and
  85  *              (2) they don't have doorlock mechanisms.
  86  *      This test catches them, and is invoked elsewhere when setting
  87  *      appropriate config bits.
  88  *
  89  *      FIXME: This treatment is probably applicable for *all* PCMCIA (PC CARD)
  90  *      devices, so in linux 2.3.x we should change this to just treat all
  91  *      PCMCIA  drives this way, and get rid of the model-name tests below
  92  *      (too big of an interface change for 2.4.x).
  93  *      At that time, we might also consider parameterizing the timeouts and
  94  *      retries, since these are MUCH faster than mechanical drives. -M.Lord
  95  */
  96
  97 static inline int drive_is_flashcard (ide_drive_t *drive)
  98 {
  99         struct hd_driveid *id = drive->id;
 100
 101         if (drive->removable) {
 102                 if (id->config == 0x848a) return 1;     /* CompactFlash */
 103                 if (!strncmp(id->model, "KODAK ATA_FLASH", 15)  /* Kodak */
 104                  || !strncmp(id->model, "Hitachi CV", 10)       /* Hitachi */
 105                  || !strncmp(id->model, "SunDisk SDCFB", 13)    /* SunDisk */
 106                  || !strncmp(id->model, "HAGIWARA HPC", 12)     /* Hagiwara */
 107                  || !strncmp(id->model, "LEXAR ATA_FLASH", 15)  /* Lexar */
 108                  || !strncmp(id->model, "ATA_FLASH", 9))        /* Simple Tech */
 109                 {
 110                         return 1;       /* yes, it is a flash memory card */
 111                 }
 112         }
 113         return 0;       /* no, it is not a flash memory card */
 114 }
 115
 116 /**
 117  *      do_identify     -       identify a drive
 118  *      @drive: drive to identify
 119  *      @cmd: command used
 120  *
 121  *      Called when we have issued a drive identify command to
 122  *      read and parse the results. This function is run with
 123  *      interrupts disabled.
 124  */
 125
 126 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 127 {
 128         ide_hwif_t *hwif = HWIF(drive);
 129         int bswap = 1;
 130         struct hd_driveid *id;
 131
 132         id = drive->id;
 133         /* read 512 bytes of id info */
 134         hwif->ata_input_data(drive, id, SECTOR_WORDS);
 135
 136         drive->id_read = 1;
 137         local_irq_enable();
 138         ide_fix_driveid(id);
 139
 140         if (!drive->forced_lun)
 141                 drive->last_lun = id->last_lun & 0x7;
 142
 143 #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 144         /*
 145          * EATA SCSI controllers do a hardware ATA emulation:
 146          * Ignore them if there is a driver for them available.
 147          */
 148         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 149             (id->model[0] == 'S' && id->model[1] == 'K')) {
 150                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 151                 goto err_misc;
 152         }
 153 #endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
 154
 155         /*
 156          *  WIN_IDENTIFY returns little-endian info,
 157          *  WIN_PIDENTIFY *usually* returns little-endian info.
 158          */
 159         if (cmd == WIN_PIDENTIFY) {
 160                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 161                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 162                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 163                         /* Vertos drives may still be weird */
 164                         bswap ^= 1;
 165         }
 166         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 167         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 168         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 169
 170         if (strstr(id->model, "E X A B Y T E N E S T"))
 171                 goto err_misc;
 172
 173         /* we depend on this a lot! */
 174         id->model[sizeof(id->model)-1] = '\0';
 175         printk("%s: %s, ", drive->name, id->model);
 176         drive->present = 1;
 177         drive->dead = 0;
 178
 179         /*
 180          * Check for an ATAPI device
 181          */
 182         if (cmd == WIN_PIDENTIFY) {
 183                 u8 type = (id->config >> 8) & 0x1f;
 184                 printk("ATAPI ");
 185 #ifdef CONFIG_BLK_DEV_PDC4030
 186                 if (hwif->channel == 1 && hwif->chipset == ide_pdc4030) {
 187                         printk(" -- not supported on 2nd Promise port\n");
 188                         goto err_misc;
 189                 }
 190 #endif /* CONFIG_BLK_DEV_PDC4030 */
 191                 switch (type) {
 192                         case ide_floppy:
 193                                 if (!strstr(id->model, "CD-ROM")) {
 194                                         if (!strstr(id->model, "oppy") &&
 195                                             !strstr(id->model, "poyp") &&
 196                                             !strstr(id->model, "ZIP"))
 197                                                 printk("cdrom or floppy?, assuming ");
 198                                         if (drive->media != ide_cdrom) {
 199                                                 printk ("FLOPPY");
 200                                                 drive->removable = 1;
 201                                                 break;
 202                                         }
 203                                 }
 204                                 /* Early cdrom models used zero */
 205                                 type = ide_cdrom;
 206                         case ide_cdrom:
 207                                 drive->removable = 1;
 208 #ifdef CONFIG_PPC
 209                                 /* kludge for Apple PowerBook internal zip */
 210                                 if (!strstr(id->model, "CD-ROM") &&
 211                                     strstr(id->model, "ZIP")) {
 212                                         printk ("FLOPPY");
 213                                         type = ide_floppy;
 214                                         break;
 215                                 }
 216 #endif
 217                                 printk ("CD/DVD-ROM");
 218                                 break;
 219                         case ide_tape:
 220                                 printk ("TAPE");
 221                                 break;
 222                         case ide_optical:
 223                                 printk ("OPTICAL");
 224                                 drive->removable = 1;
 225                                 break;
 226                         default:
 227                                 printk("UNKNOWN (type %d)", type);
 228                                 break;
 229                 }
 230                 printk (" drive\n");
 231                 drive->media = type;
 232                 return;
 233         }
 234
 235         /*
 236          * Not an ATAPI device: looks like a "regular" hard disk
 237          */
 238         if (id->config & (1<<7))
 239                 drive->removable = 1;
 240
 241         /*
 242          * Prevent long system lockup probing later for non-existant
 243          * slave drive if the hwif is actually a flash memory card of
 244          * some variety:
 245          */
 246         drive->is_flash = 0;
 247         if (drive_is_flashcard(drive)) {
 248 #if 0
 249                 /* The new IDE adapter widgets don't follow this heuristic
 250                    so we must nowdays just bite the bullet and take the
 251                    probe hit */
 252                 ide_drive_t *mate = &hwif->drives[1^drive->select.b.unit];
 253                 ide_drive_t *mate = &hwif->drives[1^drive->select.b.unit];
 254                 if (!mate->ata_flash) {
 255                         mate->present = 0;
 256                         mate->noprobe = 1;
 257                 }
 258 #endif
 259                 drive->is_flash = 1;
 260         }
 261         drive->media = ide_disk;
 262         printk("%s DISK drive\n", (drive->is_flash) ? "CFA" : "ATA" );
 263         QUIRK_LIST(drive);
 264
 265         /* Initialize queue depth settings */
 266         drive->queue_depth = 1;
 267 #ifdef CONFIG_BLK_DEV_IDE_TCQ_DEPTH
 268         drive->queue_depth = CONFIG_BLK_DEV_IDE_TCQ_DEPTH;
 269 #else
 270         drive->queue_depth = drive->id->queue_depth + 1;
 271 #endif
 272         if (drive->queue_depth < 1 || drive->queue_depth > IDE_MAX_TAG)
 273                 drive->queue_depth = IDE_MAX_TAG;
 274
 275         return;
 276
 277 err_misc:
 278         kfree(id);
 279         drive->present = 0;
 280         return;
 281 }
 282
 283 /**
 284  *      actual_try_to_identify  -       send ata/atapi identify
 285  *      @drive: drive to identify
 286  *      @cmd: command to use
 287  *
 288  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 289  *      and waits for a response.  It also monitors irqs while this is
 290  *      happening, in hope of automatically determining which one is
 291  *      being used by the interface.
 292  *
 293  *      Returns:        0  device was identified
 294  *                      1  device timed-out (no response to identify request)
 295  *                      2  device aborted the command (refused to identify itself)
 296  */
 297
 298 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 299 {
 300         ide_hwif_t *hwif = HWIF(drive);
 301         int rc;
 302         unsigned long hd_status;
 303         unsigned long timeout;
 304         u8 s = 0, a = 0;
 305
 306         if (IDE_CONTROL_REG) {
 307                 /* take a deep breath */
 308                 ide_delay_50ms();
 309                 a = hwif->INB(IDE_ALTSTATUS_REG);
 310                 s = hwif->INB(IDE_STATUS_REG);
 311                 if ((a ^ s) & ~INDEX_STAT) {
 312                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 313                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 314                         /* ancient Seagate drives, broken interfaces */
 315                         hd_status = IDE_STATUS_REG;
 316                 } else {
 317                         /* use non-intrusive polling */
 318                         hd_status = IDE_ALTSTATUS_REG;
 319                 }
 320         } else {
 321                 ide_delay_50ms();
 322                 hd_status = IDE_STATUS_REG;
 323         }
 324
 325         /* set features register for atapi
 326          * identify command to be sure of reply
 327          */
 328         if ((cmd == WIN_PIDENTIFY))
 329                 /* disable dma & overlap */
 330                 hwif->OUTB(0, IDE_FEATURE_REG);
 331
 332         if (hwif->identify != NULL) {
 333                 if (hwif->identify(drive))
 334                         return 1;
 335         } else {
 336                 /* ask drive for ID */
 337                 hwif->OUTB(cmd, IDE_COMMAND_REG);
 338         }
 339         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 340         timeout += jiffies;
 341         do {
 342                 if (time_after(jiffies, timeout)) {
 343                         /* drive timed-out */
 344                         return 1;
 345                 }
 346                 /* give drive a breather */
 347                 ide_delay_50ms();
 348         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 349
 350         /* wait for IRQ and DRQ_STAT */
 351         ide_delay_50ms();
 352         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 353                 unsigned long flags;
 354
 355                 /* local CPU only; some systems need this */
 356                 local_irq_save(flags);
 357                 /* drive returned ID */
 358                 do_identify(drive, cmd);
 359                 /* drive responded with ID */
 360                 rc = 0;
 361                 /* clear drive IRQ */
 362                 (void) hwif->INB(IDE_STATUS_REG);
 363                 local_irq_restore(flags);
 364         } else {
 365                 /* drive refused ID */
 366                 rc = 2;
 367         }
 368         return rc;
 369 }
 370
 371 /**
 372  *      try_to_identify -       try to identify a drive
 373  *      @drive: drive to probe
 374  *      @cmd: command to use
 375  *
 376  *      Issue the identify command and then do IRQ probing to
 377  *      complete the identification when needed by finding the
 378  *      IRQ the drive is attached to
 379  */
 380
 381 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 382 {
 383         ide_hwif_t *hwif = HWIF(drive);
 384         int retval;
 385         int autoprobe = 0;
 386         unsigned long cookie = 0;
 387
 388         /*
 389          * Disable device irq unless we need to
 390          * probe for it. Otherwise we'll get spurious
 391          * interrupts during the identify-phase that
 392          * the irq handler isn't expecting.
 393          */
 394         if (IDE_CONTROL_REG) {
 395                 u8 ctl = drive->ctl | 2;
 396                 if (!hwif->irq) {
 397                         autoprobe = 1;
 398                         cookie = probe_irq_on();
 399                         /* enable device irq */
 400                         ctl &= ~2;
 401                 }
 402                 hwif->OUTB(ctl, IDE_CONTROL_REG);
 403         }
 404
 405         retval = actual_try_to_identify(drive, cmd);
 406
 407         if (autoprobe) {
 408                 int irq;
 409                 /* mask device irq */
 410                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 411                 /* clear drive IRQ */
 412                 (void) hwif->INB(IDE_STATUS_REG);
 413                 udelay(5);
 414                 irq = probe_irq_off(cookie);
 415                 if (!hwif->irq) {
 416                         if (irq > 0) {
 417                                 hwif->irq = irq;
 418                         } else {
 419                                 /* Mmmm.. multiple IRQs..
 420                                  * don't know which was ours
 421                                  */
 422                                 printk("%s: IRQ probe failed (0x%lx)\n",
 423                                         drive->name, cookie);
 424 #ifdef CONFIG_BLK_DEV_CMD640
 425 #ifdef CMD640_DUMP_REGS
 426                                 if (hwif->chipset == ide_cmd640) {
 427                                         printk("%s: Hmmm.. probably a driver "
 428                                                 "problem.\n", drive->name);
 429                                         CMD640_DUMP_REGS;
 430                                 }
 431 #endif /* CMD640_DUMP_REGS */
 432 #endif /* CONFIG_BLK_DEV_CMD640 */
 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         ide_delay_50ms();
 481         SELECT_DRIVE(drive);
 482         ide_delay_50ms();
 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                         ide_delay_50ms();
 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                         ide_delay_50ms();
 512                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 513                         ide_delay_50ms();
 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                                 ide_delay_50ms();
 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                 ide_delay_50ms();
 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         ide_delay_50ms();
 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                 ide_delay_50ms();
 559         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 560
 561         ide_delay_50ms();
 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 = kmalloc(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         memset(drive->id, 0, SECTOR_WORDS * 4);
 607         strcpy(drive->id->model, "UNKNOWN");
 608
 609         /* skip probing? */
 610         if (!drive->noprobe)
 611         {
 612                 /* if !(success||timed-out) */
 613                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 614                         /* look for ATAPI device */
 615                         (void) do_probe(drive, WIN_PIDENTIFY);
 616                 }
 617                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 618                         enable_nest(drive);
 619                 if (!drive->present)
 620                         /* drive not found */
 621                         return 0;
 622
 623                 /* identification failed? */
 624                 if (!drive->id_read) {
 625                         if (drive->media == ide_disk) {
 626                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 627                                         drive->name, drive->cyl,
 628                                         drive->head, drive->sect);
 629                         } else if (drive->media == ide_cdrom) {
 630                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 631                         } else {
 632                                 /* nuke it */
 633                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 634                                 drive->present = 0;
 635                         }
 636                 }
 637                 /* drive was found */
 638         }
 639         if(!drive->present)
 640                 return 0;
 641         /* The drive wasn't being helpful. Add generic info only */
 642         if(!drive->id_read)
 643                 generic_id(drive);
 644         return drive->present;
 645 }
 646
 647 static void hwif_register (ide_hwif_t *hwif)
 648 {
 649         /* register with global device tree */
 650         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 651         snprintf(hwif->gendev.name,DEVICE_NAME_SIZE,"IDE Controller");
 652         hwif->gendev.driver_data = hwif;
 653         if (hwif->pci_dev)
 654                 hwif->gendev.parent = &hwif->pci_dev->dev;
 655         else
 656                 hwif->gendev.parent = NULL; /* Would like to do = &device_legacy */
 657         device_register(&hwif->gendev);
 658 }
 659
 660 //EXPORT_SYMBOL(hwif_register);
 661
 662 #ifdef CONFIG_PPC
 663 static int wait_hwif_ready(ide_hwif_t *hwif)
 664 {
 665         int rc;
 666
 667         printk(KERN_INFO "Probing IDE interface %s...\n", hwif->name);
 668
 669         /* Let HW settle down a bit from whatever init state we
 670          * come from */
 671         mdelay(2);
 672
 673         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 674          * I know of at least one disk who takes 31 seconds, I use 35
 675          * here to be safe
 676          */
 677         rc = ide_wait_not_busy(hwif, 35000);
 678         if (rc)
 679                 return rc;
 680
 681         /* Now make sure both master & slave are ready */
 682         SELECT_DRIVE(&hwif->drives[0]);
 683         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 684         mdelay(2);
 685         rc = ide_wait_not_busy(hwif, 10000);
 686         if (rc)
 687                 return rc;
 688         SELECT_DRIVE(&hwif->drives[1]);
 689         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 690         mdelay(2);
 691         rc = ide_wait_not_busy(hwif, 10000);
 692
 693         /* Exit function with master reselected (let's be sane) */
 694         SELECT_DRIVE(&hwif->drives[0]);
 695
 696         return rc;
 697 }
 698 #endif
 699
 700 /*
 701  * This routine only knows how to look for drive units 0 and 1
 702  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 703  */
 704 void probe_hwif (ide_hwif_t *hwif)
 705 {
 706         unsigned int unit;
 707         unsigned long flags;
 708         unsigned int irqd;
 709
 710         if (hwif->noprobe)
 711                 return;
 712
 713         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 714 #ifdef CONFIG_BLK_DEV_PDC4030
 715             (hwif->chipset != ide_pdc4030 || hwif->channel == 0) &&
 716 #endif /* CONFIG_BLK_DEV_PDC4030 */
 717             (ide_hwif_request_regions(hwif))) {
 718                 u16 msgout = 0;
 719                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 720                         ide_drive_t *drive = &hwif->drives[unit];
 721                         if (drive->present) {
 722                                 drive->present = 0;
 723                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 724                                         drive->name);
 725                                 msgout = 1;
 726                         }
 727                 }
 728                 if (!msgout)
 729                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 730                                 hwif->name);
 731                 return;
 732         }
 733
 734         /*
 735          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 736          * we'll install our IRQ driver much later...
 737          */
 738         irqd = hwif->irq;
 739         if (irqd)
 740                 disable_irq(hwif->irq);
 741
 742         local_irq_set(flags);
 743
 744 #ifdef CONFIG_PPC
 745         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 746          * platforms. Typical cases are:
 747          *
 748          *  - The firmware hard reset the disk before booting the kernel,
 749          *    the drive is still doing it's poweron-reset sequence, that
 750          *    can take up to 30 seconds
 751          *  - The firmware does nothing (or no firmware), the device is
 752          *    still in POST state (same as above actually).
 753          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 754          *    their reset sequence even when they are non-selected slave
 755          *    devices, thus preventing discovery of the main HD
 756          *
 757          *  Doing this wait-for-busy should not harm any existing configuration
 758          *  (at least things won't be worse than what current code does, that
 759          *  is blindly go & talk to the drive) and fix some issues like the
 760          *  above.
 761          *
 762          *  BenH.
 763          */
 764         if (wait_hwif_ready(hwif))
 765                 printk(KERN_WARNING "%s: Wait for ready failed before probe !\n", hwif->name);
 766 #endif /* CONFIG_PPC */
 767
 768         /*
 769          * Second drive should only exist if first drive was found,
 770          * but a lot of cdrom drives are configured as single slaves.
 771          */
 772         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 773                 ide_drive_t *drive = &hwif->drives[unit];
 774                 drive->dn = ((hwif->channel ? 2 : 0) + unit);
 775                 hwif->drives[unit].dn = ((hwif->channel ? 2 : 0) + unit);
 776                 (void) probe_for_drive(drive);
 777                 if (drive->present && !hwif->present) {
 778                         hwif->present = 1;
 779                         if (hwif->chipset != ide_4drives ||
 780                             !hwif->mate ||
 781                             !hwif->mate->present) {
 782                                 hwif_register(hwif);
 783                         }
 784                 }
 785         }
 786         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 787                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 788                 u8 stat;
 789
 790                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 791                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 792                 udelay(10);
 793                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 794                 do {
 795                         ide_delay_50ms();
 796                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 797                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 798
 799         }
 800         local_irq_restore(flags);
 801         /*
 802          * Use cached IRQ number. It might be (and is...) changed by probe
 803          * code above
 804          */
 805         if (irqd)
 806                 enable_irq(irqd);
 807
 808         if (!hwif->present) {
 809                 ide_hwif_release_regions(hwif);
 810                 return;
 811         }
 812
 813         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 814                 ide_drive_t *drive = &hwif->drives[unit];
 815                 int enable_dma = 1;
 816
 817                 if (drive->present) {
 818                         if (hwif->tuneproc != NULL &&
 819                                 drive->autotune == IDE_TUNE_AUTO)
 820                                 /* auto-tune PIO mode */
 821                                 hwif->tuneproc(drive, 255);
 822
 823 #ifdef CONFIG_IDEDMA_ONLYDISK
 824                         if (drive->media != ide_disk)
 825                                 enable_dma = 0;
 826 #endif
 827                         /*
 828                          * MAJOR HACK BARF :-/
 829                          *
 830                          * FIXME: chipsets own this cruft!
 831                          */
 832                         /*
 833                          * Move here to prevent module loading clashing.
 834                          */
 835         //              drive->autodma = hwif->autodma;
 836                         if ((hwif->ide_dma_check) &&
 837                                 ((drive->autotune == IDE_TUNE_DEFAULT) ||
 838                                 (drive->autotune == IDE_TUNE_AUTO))) {
 839                                 /*
 840                                  * Force DMAing for the beginning of the check.
 841                                  * Some chipsets appear to do interesting
 842                                  * things, if not checked and cleared.
 843                                  *   PARANOIA!!!
 844                                  */
 845                                 hwif->ide_dma_off_quietly(drive);
 846                                 if (enable_dma)
 847                                         hwif->ide_dma_check(drive);
 848                         }
 849                 }
 850         }
 851 }
 852
 853 EXPORT_SYMBOL(probe_hwif);
 854
 855 int hwif_init (ide_hwif_t *hwif);
 856 int probe_hwif_init (ide_hwif_t *hwif)
 857 {
 858         hwif->initializing = 1;
 859         probe_hwif(hwif);
 860         hwif_init(hwif);
 861
 862         if (hwif->present) {
 863                 u16 unit = 0;
 864                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 865                         ide_drive_t *drive = &hwif->drives[unit];
 866                         /* For now don't attach absent drives, we may
 867                            want them on default or a new "empty" class
 868                            for hotplug reprobing ? */
 869                         if (drive->present) {
 870                                 ata_attach(drive);
 871                         }
 872                 }
 873         }
 874         hwif->initializing = 0;
 875         return 0;
 876 }
 877
 878 EXPORT_SYMBOL(probe_hwif_init);
 879
 880 #if MAX_HWIFS > 1
 881 /*
 882  * save_match() is used to simplify logic in init_irq() below.
 883  *
 884  * A loophole here is that we may not know about a particular
 885  * hwif's irq until after that hwif is actually probed/initialized..
 886  * This could be a problem for the case where an hwif is on a
 887  * dual interface that requires serialization (eg. cmd640) and another
 888  * hwif using one of the same irqs is initialized beforehand.
 889  *
 890  * This routine detects and reports such situations, but does not fix them.
 891  */
 892 void save_match (ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 893 {
 894         ide_hwif_t *m = *match;
 895
 896         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 897                 if (!new->hwgroup)
 898                         return;
 899                 printk("%s: potential irq problem with %s and %s\n",
 900                         hwif->name, new->name, m->name);
 901         }
 902         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 903                 *match = new;
 904 }
 905 EXPORT_SYMBOL(save_match);
 906 #endif /* MAX_HWIFS > 1 */
 907
 908 /*
 909  * init request queue
 910  */
 911 static void ide_init_queue(ide_drive_t *drive)
 912 {
 913         request_queue_t *q = &drive->queue;
 914         ide_hwif_t *hwif = HWIF(drive);
 915         int max_sectors = 256;
 916
 917         /*
 918          *      Our default set up assumes the normal IDE case,
 919          *      that is 64K segmenting, standard PRD setup
 920          *      and LBA28. Some drivers then impose their own
 921          *      limits and LBA48 we could raise it but as yet
 922          *      do not.
 923          */
 924
 925         blk_init_queue(q, do_ide_request, &ide_lock);
 926         q->queuedata = HWGROUP(drive);
 927         blk_queue_segment_boundary(q, 0xffff);
 928
 929         if (!hwif->rqsize)
 930                 hwif->rqsize = hwif->addressing ? 256 : 65536;
 931         if (hwif->rqsize < max_sectors)
 932                 max_sectors = hwif->rqsize;
 933         blk_queue_max_sectors(q, max_sectors);
 934
 935         /* IDE DMA can do PRD_ENTRIES number of segments. */
 936         blk_queue_max_hw_segments(q, PRD_ENTRIES);
 937
 938         /* This is a driver limit and could be eliminated. */
 939         blk_queue_max_phys_segments(q, PRD_ENTRIES);
 940 }
 941
 942 /*
 943  * Setup the drive for request handling.
 944  */
 945 static void ide_init_drive(ide_drive_t *drive)
 946 {
 947         ide_toggle_bounce(drive, 1);
 948 }
 949
 950 /*
 951  * This routine sets up the irq for an ide interface, and creates a new
 952  * hwgroup for the irq/hwif if none was previously assigned.
 953  *
 954  * Much of the code is for correctly detecting/handling irq sharing
 955  * and irq serialization situations.  This is somewhat complex because
 956  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 957  *
 958  * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
 959  * interrupts completely disabled.  This can be bad for interrupt latency,
 960  * but anything else has led to problems on some machines.  We re-enable
 961  * interrupts as much as we can safely do in most places.
 962  */
 963 static int init_irq (ide_hwif_t *hwif)
 964 {
 965         unsigned int index;
 966         ide_hwgroup_t *hwgroup;
 967         ide_hwif_t *match = NULL;
 968
 969
 970         BUG_ON(in_interrupt());
 971         BUG_ON(irqs_disabled());
 972         down(&ide_cfg_sem);
 973         hwif->hwgroup = NULL;
 974 #if MAX_HWIFS > 1
 975         /*
 976          * Group up with any other hwifs that share our irq(s).
 977          */
 978         for (index = 0; index < MAX_HWIFS; index++) {
 979                 ide_hwif_t *h = &ide_hwifs[index];
 980                 if (h->hwgroup) {  /* scan only initialized hwif's */
 981                         if (hwif->irq == h->irq) {
 982                                 hwif->sharing_irq = h->sharing_irq = 1;
 983                                 if (hwif->chipset != ide_pci ||
 984                                     h->chipset != ide_pci) {
 985                                         save_match(hwif, h, &match);
 986                                 }
 987                         }
 988                         if (hwif->serialized) {
 989                                 if (hwif->mate && hwif->mate->irq == h->irq)
 990                                         save_match(hwif, h, &match);
 991                         }
 992                         if (h->serialized) {
 993                                 if (h->mate && hwif->irq == h->mate->irq)
 994                                         save_match(hwif, h, &match);
 995                         }
 996                 }
 997         }
 998 #endif /* MAX_HWIFS > 1 */
 999         /*
1000          * If we are still without a hwgroup, then form a new one
1001          */
1002         if (match) {
1003                 hwgroup = match->hwgroup;
1004                 hwif->hwgroup = hwgroup;
1005                 /*
1006                  * Link us into the hwgroup.
1007                  * This must be done early, do ensure that unexpected_intr
1008                  * can find the hwif and prevent irq storms.
1009                  * No drives are attached to the new hwif, choose_drive
1010                  * can't do anything stupid (yet).
1011                  * Add ourself as the 2nd entry to the hwgroup->hwif
1012                  * linked list, the first entry is the hwif that owns
1013                  * hwgroup->handler - do not change that.
1014                  */
1015                 spin_lock_irq(&ide_lock);
1016                 hwif->next = hwgroup->hwif->next;
1017                 hwgroup->hwif->next = hwif;
1018                 spin_unlock_irq(&ide_lock);
1019         } else {
1020                 hwgroup = kmalloc(sizeof(ide_hwgroup_t),GFP_KERNEL);
1021                 if (!hwgroup)
1022                         goto out_up;
1023
1024                 hwif->hwgroup = hwgroup;
1025
1026                 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1027                 hwgroup->hwif     = hwif->next = hwif;
1028                 hwgroup->rq       = NULL;
1029                 hwgroup->handler  = NULL;
1030                 hwgroup->drive    = NULL;
1031                 hwgroup->busy     = 0;
1032                 init_timer(&hwgroup->timer);
1033                 hwgroup->timer.function = &ide_timer_expiry;
1034                 hwgroup->timer.data = (unsigned long) hwgroup;
1035         }
1036
1037         /*
1038          * Allocate the irq, if not already obtained for another hwif
1039          */
1040         if (!match || match->irq != hwif->irq) {
1041                 int sa = SA_INTERRUPT;
1042 #if defined(__mc68000__) || defined(CONFIG_APUS)
1043                 sa = SA_SHIRQ;
1044 #endif /* __mc68000__ || CONFIG_APUS */
1045
1046                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1047                         sa = SA_SHIRQ;
1048 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1049                         sa |= SA_INTERRUPT;
1050 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1051                 }
1052
1053                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1054                         /* clear nIEN */
1055                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1056
1057                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1058                         goto out_unlink;
1059         }
1060
1061         /*
1062          * Link any new drives into the hwgroup, allocate
1063          * the block device queue and initialize the drive.
1064          * Note that ide_init_drive sends commands to the new
1065          * drive.
1066          */
1067         for (index = 0; index < MAX_DRIVES; ++index) {
1068                 ide_drive_t *drive = &hwif->drives[index];
1069                 if (!drive->present)
1070                         continue;
1071                 ide_init_queue(drive);
1072                 spin_lock_irq(&ide_lock);
1073                 if (!hwgroup->drive) {
1074                         /* first drive for hwgroup. */
1075                         drive->next = drive;
1076                         hwgroup->drive = drive;
1077                         hwgroup->hwif = HWIF(hwgroup->drive);
1078                 } else {
1079                         drive->next = hwgroup->drive->next;
1080                         hwgroup->drive->next = drive;
1081                 }
1082                 spin_unlock_irq(&ide_lock);
1083                 ide_init_drive(drive);
1084         }
1085
1086 #if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
1087         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1088                 hwif->io_ports[IDE_DATA_OFFSET],
1089                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1090                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1091 #elif defined(__sparc__)
1092         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
1093                 hwif->io_ports[IDE_DATA_OFFSET],
1094                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1095                 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
1096 #else
1097         printk("%s at 0x%08lx on irq %d", hwif->name,
1098                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1099 #endif /* __mc68000__ && CONFIG_APUS */
1100         if (match)
1101                 printk(" (%sed with %s)",
1102                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1103         printk("\n");
1104         up(&ide_cfg_sem);
1105         return 0;
1106 out_unlink:
1107         spin_lock_irq(&ide_lock);
1108         if (hwif->next == hwif) {
1109                 BUG_ON(match);
1110                 BUG_ON(hwgroup->hwif != hwif);
1111                 kfree(hwgroup);
1112         } else {
1113                 ide_hwif_t *g;
1114                 g = hwgroup->hwif;
1115                 while (g->next != hwif)
1116                         g = g->next;
1117                 g->next = hwif->next;
1118                 if (hwgroup->hwif == hwif) {
1119                         /* Impossible. */
1120                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1121                         hwgroup->hwif = g;
1122                 }
1123                 BUG_ON(hwgroup->hwif == hwif);
1124         }
1125         spin_unlock_irq(&ide_lock);
1126 out_up:
1127         up(&ide_cfg_sem);
1128         return 1;
1129 }
1130
1131 static int ata_lock(dev_t dev, void *data)
1132 {
1133         /* FIXME: we want to pin hwif down */
1134         return 0;
1135 }
1136
1137 struct kobject *ata_probe(dev_t dev, int *part, void *data)
1138 {
1139         ide_hwif_t *hwif = data;
1140         int unit = *part >> PARTN_BITS;
1141         ide_drive_t *drive = &hwif->drives[unit];
1142         if (!drive->present)
1143                 return NULL;
1144         if (!drive->driver) {
1145                 if (drive->media == ide_disk)
1146                         (void) request_module("ide-disk");
1147                 if (drive->scsi)
1148                         (void) request_module("ide-scsi");
1149                 if (drive->media == ide_cdrom || drive->media == ide_optical)
1150                         (void) request_module("ide-cd");
1151                 if (drive->media == ide_tape)
1152                         (void) request_module("ide-tape");
1153                 if (drive->media == ide_floppy)
1154                         (void) request_module("ide-floppy");
1155         }
1156         if (!drive->driver)
1157                 return NULL;
1158         *part &= (1 << PARTN_BITS) - 1;
1159         return get_disk(drive->disk);
1160 }
1161
1162 static int alloc_disks(ide_hwif_t *hwif)
1163 {
1164         unsigned int unit;
1165         struct gendisk *disks[MAX_DRIVES];
1166
1167         for (unit = 0; unit < MAX_DRIVES; unit++) {
1168                 disks[unit] = alloc_disk(1 << PARTN_BITS);
1169                 if (!disks[unit])
1170                         goto Enomem;
1171         }
1172         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1173                 ide_drive_t *drive = &hwif->drives[unit];
1174                 struct gendisk *disk = disks[unit];
1175                 disk->major  = hwif->major;
1176                 disk->first_minor = unit << PARTN_BITS;
1177                 sprintf(disk->disk_name,"hd%c",'a'+hwif->index*MAX_DRIVES+unit);
1178                 disk->fops = ide_fops;
1179                 disk->private_data = drive;
1180                 disk->queue = &drive->queue;
1181                 drive->disk = disk;
1182         }
1183         return 0;
1184 Enomem:
1185         printk(KERN_WARNING "(ide::init_gendisk) Out of memory\n");
1186         while (unit--)
1187                 put_disk(disks[unit]);
1188         return -ENOMEM;
1189 }
1190
1191 /*
1192  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1193  * after probing for drives, to allocate partition tables and other data
1194  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1195  * somewhat later, during the partition check.
1196  */
1197 static void init_gendisk (ide_hwif_t *hwif)
1198 {
1199         unsigned int unit;
1200
1201         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1202                 ide_drive_t * drive = &hwif->drives[unit];
1203                 ide_add_generic_settings(drive);
1204                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1205                          hwif->index,unit);
1206                 snprintf(drive->gendev.name,DEVICE_NAME_SIZE,
1207                          "%s","IDE Drive");
1208                 drive->gendev.parent = &hwif->gendev;
1209                 drive->gendev.bus = &ide_bus_type;
1210                 drive->gendev.driver_data = drive;
1211                 if (drive->present) {
1212                         device_register(&drive->gendev);
1213                         sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
1214                                 (hwif->channel && hwif->mate) ?
1215                                 hwif->mate->index : hwif->index,
1216                                 hwif->channel, unit, drive->lun);
1217                 }
1218         }
1219         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1220                         THIS_MODULE, ata_probe, ata_lock, hwif);
1221 }
1222
1223 EXPORT_SYMBOL(init_gendisk);
1224
1225 int hwif_init (ide_hwif_t *hwif)
1226 {
1227         int old_irq, unit;
1228
1229         if (!hwif->present)
1230                 return 0;
1231
1232         if (!hwif->irq) {
1233                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1234                 {
1235                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1236                         return (hwif->present = 0);
1237                 }
1238         }
1239 #ifdef CONFIG_BLK_DEV_HD
1240         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1241                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1242                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1243                 return (hwif->present = 0);
1244         }
1245 #endif /* CONFIG_BLK_DEV_HD */
1246
1247         /* we set it back to 1 if all is ok below */
1248         hwif->present = 0;
1249
1250         if (register_blkdev(hwif->major, hwif->name))
1251                 return 0;
1252
1253         if (alloc_disks(hwif) < 0)
1254                 goto out;
1255
1256         if (init_irq(hwif) == 0)
1257                 goto done;
1258
1259         old_irq = hwif->irq;
1260         /*
1261          *      It failed to initialise. Find the default IRQ for
1262          *      this port and try that.
1263          */
1264         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1265                 printk("%s: Disabled unable to get IRQ %d.\n",
1266                         hwif->name, old_irq);
1267                 goto out_disks;
1268         }
1269         if (init_irq(hwif)) {
1270                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1271                         hwif->name, old_irq, hwif->irq);
1272                 goto out_disks;
1273         }
1274         printk("%s: probed IRQ %d failed, using default.\n",
1275                 hwif->name, hwif->irq);
1276
1277 done:
1278         init_gendisk(hwif);
1279         hwif->present = 1;      /* success */
1280         return 1;
1281
1282 out_disks:
1283         for (unit = 0; unit < MAX_DRIVES; unit++) {
1284                 struct gendisk *disk = hwif->drives[unit].disk;
1285                 hwif->drives[unit].disk = NULL;
1286                 put_disk(disk);
1287         }
1288 out:
1289         unregister_blkdev(hwif->major, hwif->name);
1290         return 0;
1291 }
1292
1293 EXPORT_SYMBOL(hwif_init);
1294
1295 void export_ide_init_queue (ide_drive_t *drive)
1296 {
1297         ide_init_queue(drive);
1298         ide_init_drive(drive);
1299 }
1300
1301 EXPORT_SYMBOL(export_ide_init_queue);
1302
1303 u8 export_probe_for_drive (ide_drive_t *drive)
1304 {
1305         return probe_for_drive(drive);
1306 }
1307
1308 EXPORT_SYMBOL(export_probe_for_drive);
1309
1310 int ideprobe_init (void);
1311 static ide_module_t ideprobe_module = {
1312         IDE_PROBE_MODULE,
1313         ideprobe_init,
1314         NULL
1315 };
1316
1317 int ideprobe_init (void)
1318 {
1319         unsigned int index;
1320         int probe[MAX_HWIFS];
1321
1322         MOD_INC_USE_COUNT;
1323         memset(probe, 0, MAX_HWIFS * sizeof(int));
1324         for (index = 0; index < MAX_HWIFS; ++index)
1325                 probe[index] = !ide_hwifs[index].present;
1326
1327         /*
1328          * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
1329          */
1330         for (index = 0; index < MAX_HWIFS; ++index)
1331                 if (probe[index])
1332                         probe_hwif(&ide_hwifs[index]);
1333         for (index = 0; index < MAX_HWIFS; ++index)
1334                 if (probe[index])
1335                         hwif_init(&ide_hwifs[index]);
1336         for (index = 0; index < MAX_HWIFS; ++index) {
1337                 if (probe[index]) {
1338                         ide_hwif_t *hwif = &ide_hwifs[index];
1339                         int unit;
1340                         if (!hwif->present)
1341                                 continue;
1342                         for (unit = 0; unit < MAX_DRIVES; ++unit)
1343                                 if (hwif->drives[unit].present)
1344                                         ata_attach(&hwif->drives[unit]);
1345                 }
1346         }
1347         if (!ide_probe)
1348                 ide_probe = &ideprobe_module;
1349         MOD_DEC_USE_COUNT;
1350         return 0;
1351 }
1352
1353 #ifdef MODULE
1354 int init_module (void)
1355 {
1356         unsigned int index;
1357
1358         for (index = 0; index < MAX_HWIFS; ++index)
1359                 ide_unregister(index);
1360         ideprobe_init();
1361         create_proc_ide_interfaces();
1362         return 0;
1363 }
1364
1365 void cleanup_module (void)
1366 {
1367         ide_probe = NULL;
1368 }
1369 MODULE_LICENSE("GPL");
1370 #endif /* MODULE */