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/kmod.h>
  52 #include <linux/pci.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)    /* old SanDisk */
 106                  || !strncmp(id->model, "SanDisk SDCFB", 13)    /* SanDisk */
 107                  || !strncmp(id->model, "HAGIWARA HPC", 12)     /* Hagiwara */
 108                  || !strncmp(id->model, "LEXAR ATA_FLASH", 15)  /* Lexar */
 109                  || !strncmp(id->model, "ATA_FLASH", 9))        /* Simple Tech */
 110                 {
 111                         return 1;       /* yes, it is a flash memory card */
 112                 }
 113         }
 114         return 0;       /* no, it is not a flash memory card */
 115 }
 116
 117 /**
 118  *      do_identify     -       identify a drive
 119  *      @drive: drive to identify
 120  *      @cmd: command used
 121  *
 122  *      Called when we have issued a drive identify command to
 123  *      read and parse the results. This function is run with
 124  *      interrupts disabled.
 125  */
 126
 127 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 128 {
 129         ide_hwif_t *hwif = HWIF(drive);
 130         int bswap = 1;
 131         struct hd_driveid *id;
 132
 133         id = drive->id;
 134         /* read 512 bytes of id info */
 135         hwif->ata_input_data(drive, id, SECTOR_WORDS);
 136
 137         drive->id_read = 1;
 138         local_irq_enable();
 139         ide_fix_driveid(id);
 140
 141 #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 142         /*
 143          * EATA SCSI controllers do a hardware ATA emulation:
 144          * Ignore them if there is a driver for them available.
 145          */
 146         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 147             (id->model[0] == 'S' && id->model[1] == 'K')) {
 148                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 149                 goto err_misc;
 150         }
 151 #endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
 152
 153         /*
 154          *  WIN_IDENTIFY returns little-endian info,
 155          *  WIN_PIDENTIFY *usually* returns little-endian info.
 156          */
 157         if (cmd == WIN_PIDENTIFY) {
 158                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 159                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 160                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 161                         /* Vertos drives may still be weird */
 162                         bswap ^= 1;
 163         }
 164         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 165         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 166         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 167
 168         if (strstr(id->model, "E X A B Y T E N E S T"))
 169                 goto err_misc;
 170
 171         /* we depend on this a lot! */
 172         id->model[sizeof(id->model)-1] = '\0';
 173         printk("%s: %s, ", drive->name, id->model);
 174         drive->present = 1;
 175         drive->dead = 0;
 176
 177         /*
 178          * Check for an ATAPI device
 179          */
 180         if (cmd == WIN_PIDENTIFY) {
 181                 u8 type = (id->config >> 8) & 0x1f;
 182                 printk("ATAPI ");
 183                 switch (type) {
 184                         case ide_floppy:
 185                                 if (!strstr(id->model, "CD-ROM")) {
 186                                         if (!strstr(id->model, "oppy") &&
 187                                             !strstr(id->model, "poyp") &&
 188                                             !strstr(id->model, "ZIP"))
 189                                                 printk("cdrom or floppy?, assuming ");
 190                                         if (drive->media != ide_cdrom) {
 191                                                 printk ("FLOPPY");
 192                                                 drive->removable = 1;
 193                                                 break;
 194                                         }
 195                                 }
 196                                 /* Early cdrom models used zero */
 197                                 type = ide_cdrom;
 198                         case ide_cdrom:
 199                                 drive->removable = 1;
 200 #ifdef CONFIG_PPC
 201                                 /* kludge for Apple PowerBook internal zip */
 202                                 if (!strstr(id->model, "CD-ROM") &&
 203                                     strstr(id->model, "ZIP")) {
 204                                         printk ("FLOPPY");
 205                                         type = ide_floppy;
 206                                         break;
 207                                 }
 208 #endif
 209                                 printk ("CD/DVD-ROM");
 210                                 break;
 211                         case ide_tape:
 212                                 printk ("TAPE");
 213                                 break;
 214                         case ide_optical:
 215                                 printk ("OPTICAL");
 216                                 drive->removable = 1;
 217                                 break;
 218                         default:
 219                                 printk("UNKNOWN (type %d)", type);
 220                                 break;
 221                 }
 222                 printk (" drive\n");
 223                 drive->media = type;
 224                 return;
 225         }
 226
 227         /*
 228          * Not an ATAPI device: looks like a "regular" hard disk
 229          */
 230         if (id->config & (1<<7))
 231                 drive->removable = 1;
 232
 233         if (drive_is_flashcard(drive))
 234                 drive->is_flash = 1;
 235         drive->media = ide_disk;
 236         printk("%s DISK drive\n", (drive->is_flash) ? "CFA" : "ATA" );
 237         QUIRK_LIST(drive);
 238         return;
 239
 240 err_misc:
 241         kfree(id);
 242         drive->present = 0;
 243         return;
 244 }
 245
 246 /**
 247  *      actual_try_to_identify  -       send ata/atapi identify
 248  *      @drive: drive to identify
 249  *      @cmd: command to use
 250  *
 251  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 252  *      and waits for a response.  It also monitors irqs while this is
 253  *      happening, in hope of automatically determining which one is
 254  *      being used by the interface.
 255  *
 256  *      Returns:        0  device was identified
 257  *                      1  device timed-out (no response to identify request)
 258  *                      2  device aborted the command (refused to identify itself)
 259  */
 260
 261 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 262 {
 263         ide_hwif_t *hwif = HWIF(drive);
 264         int rc;
 265         unsigned long hd_status;
 266         unsigned long timeout;
 267         u8 s = 0, a = 0;
 268
 269         /* take a deep breath */
 270         msleep(50);
 271
 272         if (IDE_CONTROL_REG) {
 273                 a = hwif->INB(IDE_ALTSTATUS_REG);
 274                 s = hwif->INB(IDE_STATUS_REG);
 275                 if ((a ^ s) & ~INDEX_STAT) {
 276                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 277                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 278                         /* ancient Seagate drives, broken interfaces */
 279                         hd_status = IDE_STATUS_REG;
 280                 } else {
 281                         /* use non-intrusive polling */
 282                         hd_status = IDE_ALTSTATUS_REG;
 283                 }
 284         } else
 285                 hd_status = IDE_STATUS_REG;
 286
 287         /* set features register for atapi
 288          * identify command to be sure of reply
 289          */
 290         if ((cmd == WIN_PIDENTIFY))
 291                 /* disable dma & overlap */
 292                 hwif->OUTB(0, IDE_FEATURE_REG);
 293
 294         /* ask drive for ID */
 295         hwif->OUTB(cmd, IDE_COMMAND_REG);
 296
 297         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 298         timeout += jiffies;
 299         do {
 300                 if (time_after(jiffies, timeout)) {
 301                         /* drive timed-out */
 302                         return 1;
 303                 }
 304                 /* give drive a breather */
 305                 msleep(50);
 306         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 307
 308         /* wait for IRQ and DRQ_STAT */
 309         msleep(50);
 310         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 311                 unsigned long flags;
 312
 313                 /* local CPU only; some systems need this */
 314                 local_irq_save(flags);
 315                 /* drive returned ID */
 316                 do_identify(drive, cmd);
 317                 /* drive responded with ID */
 318                 rc = 0;
 319                 /* clear drive IRQ */
 320                 (void) hwif->INB(IDE_STATUS_REG);
 321                 local_irq_restore(flags);
 322         } else {
 323                 /* drive refused ID */
 324                 rc = 2;
 325         }
 326         return rc;
 327 }
 328
 329 /**
 330  *      try_to_identify -       try to identify a drive
 331  *      @drive: drive to probe
 332  *      @cmd: command to use
 333  *
 334  *      Issue the identify command and then do IRQ probing to
 335  *      complete the identification when needed by finding the
 336  *      IRQ the drive is attached to
 337  */
 338
 339 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 340 {
 341         ide_hwif_t *hwif = HWIF(drive);
 342         int retval;
 343         int autoprobe = 0;
 344         unsigned long cookie = 0;
 345
 346         /*
 347          * Disable device irq unless we need to
 348          * probe for it. Otherwise we'll get spurious
 349          * interrupts during the identify-phase that
 350          * the irq handler isn't expecting.
 351          */
 352         if (IDE_CONTROL_REG) {
 353                 u8 ctl = drive->ctl | 2;
 354                 if (!hwif->irq) {
 355                         autoprobe = 1;
 356                         cookie = probe_irq_on();
 357                         /* enable device irq */
 358                         ctl &= ~2;
 359                 }
 360                 hwif->OUTB(ctl, IDE_CONTROL_REG);
 361         }
 362
 363         retval = actual_try_to_identify(drive, cmd);
 364
 365         if (autoprobe) {
 366                 int irq;
 367                 /* mask device irq */
 368                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 369                 /* clear drive IRQ */
 370                 (void) hwif->INB(IDE_STATUS_REG);
 371                 udelay(5);
 372                 irq = probe_irq_off(cookie);
 373                 if (!hwif->irq) {
 374                         if (irq > 0) {
 375                                 hwif->irq = irq;
 376                         } else {
 377                                 /* Mmmm.. multiple IRQs..
 378                                  * don't know which was ours
 379                                  */
 380                                 printk("%s: IRQ probe failed (0x%lx)\n",
 381                                         drive->name, cookie);
 382                         }
 383                 }
 384         }
 385         return retval;
 386 }
 387
 388
 389 /**
 390  *      do_probe                -       probe an IDE device
 391  *      @drive: drive to probe
 392  *      @cmd: command to use
 393  *
 394  *      do_probe() has the difficult job of finding a drive if it exists,
 395  *      without getting hung up if it doesn't exist, without trampling on
 396  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 397  *
 398  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 399  *      but does not respond right away, the probe will "hang in there"
 400  *      for the maximum wait time (about 30 seconds), otherwise it will
 401  *      exit much more quickly.
 402  *
 403  * Returns:     0  device was identified
 404  *              1  device timed-out (no response to identify request)
 405  *              2  device aborted the command (refused to identify itself)
 406  *              3  bad status from device (possible for ATAPI drives)
 407  *              4  probe was not attempted because failure was obvious
 408  */
 409
 410 static int do_probe (ide_drive_t *drive, u8 cmd)
 411 {
 412         int rc;
 413         ide_hwif_t *hwif = HWIF(drive);
 414
 415         if (drive->present) {
 416                 /* avoid waiting for inappropriate probes */
 417                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 418                         return 4;
 419         }
 420 #ifdef DEBUG
 421         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 422                 drive->name, drive->present, drive->media,
 423                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 424 #endif
 425
 426         /* needed for some systems
 427          * (e.g. crw9624 as drive0 with disk as slave)
 428          */
 429         msleep(50);
 430         SELECT_DRIVE(drive);
 431         msleep(50);
 432         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 433                 if (drive->select.b.unit != 0) {
 434                         /* exit with drive0 selected */
 435                         SELECT_DRIVE(&hwif->drives[0]);
 436                         /* allow BUSY_STAT to assert & clear */
 437                         msleep(50);
 438                 }
 439                 /* no i/f present: mmm.. this should be a 4 -ml */
 440                 return 3;
 441         }
 442
 443         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 444             drive->present || cmd == WIN_PIDENTIFY) {
 445                 /* send cmd and wait */
 446                 if ((rc = try_to_identify(drive, cmd))) {
 447                         /* failed: try again */
 448                         rc = try_to_identify(drive,cmd);
 449                 }
 450                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 451                         return 4;
 452
 453                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 454                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 455                         (drive->autotune == IDE_TUNE_AUTO))) {
 456                         unsigned long timeout;
 457                         printk("%s: no response (status = 0x%02x), "
 458                                 "resetting drive\n", drive->name,
 459                                 hwif->INB(IDE_STATUS_REG));
 460                         msleep(50);
 461                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 462                         msleep(50);
 463                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 464                         timeout = jiffies;
 465                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
 466                                time_before(jiffies, timeout + WAIT_WORSTCASE))
 467                                 msleep(50);
 468                         rc = try_to_identify(drive, cmd);
 469                 }
 470                 if (rc == 1)
 471                         printk("%s: no response (status = 0x%02x)\n",
 472                                 drive->name, hwif->INB(IDE_STATUS_REG));
 473                 /* ensure drive irq is clear */
 474                 (void) hwif->INB(IDE_STATUS_REG);
 475         } else {
 476                 /* not present or maybe ATAPI */
 477                 rc = 3;
 478         }
 479         if (drive->select.b.unit != 0) {
 480                 /* exit with drive0 selected */
 481                 SELECT_DRIVE(&hwif->drives[0]);
 482                 msleep(50);
 483                 /* ensure drive irq is clear */
 484                 (void) hwif->INB(IDE_STATUS_REG);
 485         }
 486         return rc;
 487 }
 488
 489 /*
 490  *
 491  */
 492 static void enable_nest (ide_drive_t *drive)
 493 {
 494         ide_hwif_t *hwif = HWIF(drive);
 495         unsigned long timeout;
 496
 497         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 498         SELECT_DRIVE(drive);
 499         msleep(50);
 500         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 501         timeout = jiffies + WAIT_WORSTCASE;
 502         do {
 503                 if (time_after(jiffies, timeout)) {
 504                         printk("failed (timeout)\n");
 505                         return;
 506                 }
 507                 msleep(50);
 508         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 509
 510         msleep(50);
 511
 512         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 513                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 514         } else {
 515                 printk("success\n");
 516         }
 517
 518         /* if !(success||timed-out) */
 519         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 520                 /* look for ATAPI device */
 521                 (void) do_probe(drive, WIN_PIDENTIFY);
 522         }
 523 }
 524
 525 /**
 526  *      probe_for_drives        -       upper level drive probe
 527  *      @drive: drive to probe for
 528  *
 529  *      probe_for_drive() tests for existence of a given drive using do_probe()
 530  *      and presents things to the user as needed.
 531  *
 532  *      Returns:        0  no device was found
 533  *                      1  device was found (note: drive->present might
 534  *                         still be 0)
 535  */
 536
 537 static inline u8 probe_for_drive (ide_drive_t *drive)
 538 {
 539         /*
 540          *      In order to keep things simple we have an id
 541          *      block for all drives at all times. If the device
 542          *      is pre ATA or refuses ATA/ATAPI identify we
 543          *      will add faked data to this.
 544          *
 545          *      Also note that 0 everywhere means "can't do X"
 546          */
 547
 548         drive->id = kmalloc(SECTOR_WORDS *4, GFP_KERNEL);
 549         drive->id_read = 0;
 550         if(drive->id == NULL)
 551         {
 552                 printk(KERN_ERR "ide: out of memory for id data.\n");
 553                 return 0;
 554         }
 555         memset(drive->id, 0, SECTOR_WORDS * 4);
 556         strcpy(drive->id->model, "UNKNOWN");
 557
 558         /* skip probing? */
 559         if (!drive->noprobe)
 560         {
 561                 /* if !(success||timed-out) */
 562                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 563                         /* look for ATAPI device */
 564                         (void) do_probe(drive, WIN_PIDENTIFY);
 565                 }
 566                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 567                         enable_nest(drive);
 568                 if (!drive->present)
 569                         /* drive not found */
 570                         return 0;
 571
 572                 /* identification failed? */
 573                 if (!drive->id_read) {
 574                         if (drive->media == ide_disk) {
 575                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 576                                         drive->name, drive->cyl,
 577                                         drive->head, drive->sect);
 578                         } else if (drive->media == ide_cdrom) {
 579                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 580                         } else {
 581                                 /* nuke it */
 582                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 583                                 drive->present = 0;
 584                         }
 585                 }
 586                 /* drive was found */
 587         }
 588         if(!drive->present)
 589                 return 0;
 590         /* The drive wasn't being helpful. Add generic info only */
 591         if(!drive->id_read)
 592                 generic_id(drive);
 593         return drive->present;
 594 }
 595
 596 static void hwif_release_dev (struct device *dev)
 597 {
 598         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 599
 600         up(&hwif->gendev_rel_sem);
 601 }
 602
 603 static void hwif_register (ide_hwif_t *hwif)
 604 {
 605         /* register with global device tree */
 606         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 607         hwif->gendev.driver_data = hwif;
 608         if (hwif->gendev.parent == NULL) {
 609                 if (hwif->pci_dev)
 610                         hwif->gendev.parent = &hwif->pci_dev->dev;
 611                 else
 612                         /* Would like to do = &device_legacy */
 613                         hwif->gendev.parent = NULL;
 614         }
 615         hwif->gendev.release = hwif_release_dev;
 616         device_register(&hwif->gendev);
 617 }
 618
 619 static int wait_hwif_ready(ide_hwif_t *hwif)
 620 {
 621         int rc;
 622
 623         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 624
 625         /* Let HW settle down a bit from whatever init state we
 626          * come from */
 627         mdelay(2);
 628
 629         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 630          * I know of at least one disk who takes 31 seconds, I use 35
 631          * here to be safe
 632          */
 633         rc = ide_wait_not_busy(hwif, 35000);
 634         if (rc)
 635                 return rc;
 636
 637         /* Now make sure both master & slave are ready */
 638         SELECT_DRIVE(&hwif->drives[0]);
 639         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 640         mdelay(2);
 641         rc = ide_wait_not_busy(hwif, 10000);
 642         if (rc)
 643                 return rc;
 644         SELECT_DRIVE(&hwif->drives[1]);
 645         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 646         mdelay(2);
 647         rc = ide_wait_not_busy(hwif, 10000);
 648
 649         /* Exit function with master reselected (let's be sane) */
 650         SELECT_DRIVE(&hwif->drives[0]);
 651
 652         return rc;
 653 }
 654
 655 /**
 656  *      ide_undecoded_slave     -       look for bad CF adapters
 657  *      @hwif: interface
 658  *
 659  *      Analyse the drives on the interface and attempt to decide if we
 660  *      have the same drive viewed twice. This occurs with crap CF adapters
 661  *      and PCMCIA sometimes.
 662  */
 663
 664 void ide_undecoded_slave(ide_hwif_t *hwif)
 665 {
 666         ide_drive_t *drive0 = &hwif->drives[0];
 667         ide_drive_t *drive1 = &hwif->drives[1];
 668
 669         if (drive0->present == 0 || drive1->present == 0)
 670                 return;
 671
 672         /* If the models don't match they are not the same product */
 673         if (strcmp(drive0->id->model, drive1->id->model))
 674                 return;
 675
 676         /* Serial numbers do not match */
 677         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 678                 return;
 679
 680         /* No serial number, thankfully very rare for CF */
 681         if (drive0->id->serial_no[0] == 0)
 682                 return;
 683
 684         /* Appears to be an IDE flash adapter with decode bugs */
 685         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 686
 687         drive1->present = 0;
 688 }
 689
 690 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 691
 692 /*
 693  * This routine only knows how to look for drive units 0 and 1
 694  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 695  */
 696 static void probe_hwif(ide_hwif_t *hwif)
 697 {
 698         unsigned int unit;
 699         unsigned long flags;
 700         unsigned int irqd;
 701
 702         if (hwif->noprobe)
 703                 return;
 704
 705         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 706             (ide_hwif_request_regions(hwif))) {
 707                 u16 msgout = 0;
 708                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 709                         ide_drive_t *drive = &hwif->drives[unit];
 710                         if (drive->present) {
 711                                 drive->present = 0;
 712                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 713                                         drive->name);
 714                                 msgout = 1;
 715                         }
 716                 }
 717                 if (!msgout)
 718                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 719                                 hwif->name);
 720                 return;
 721         }
 722
 723         /*
 724          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 725          * we'll install our IRQ driver much later...
 726          */
 727         irqd = hwif->irq;
 728         if (irqd)
 729                 disable_irq(hwif->irq);
 730
 731         local_irq_set(flags);
 732
 733         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 734          * platforms. Typical cases are:
 735          *
 736          *  - The firmware hard reset the disk before booting the kernel,
 737          *    the drive is still doing it's poweron-reset sequence, that
 738          *    can take up to 30 seconds
 739          *  - The firmware does nothing (or no firmware), the device is
 740          *    still in POST state (same as above actually).
 741          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 742          *    their reset sequence even when they are non-selected slave
 743          *    devices, thus preventing discovery of the main HD
 744          *
 745          *  Doing this wait-for-busy should not harm any existing configuration
 746          *  (at least things won't be worse than what current code does, that
 747          *  is blindly go & talk to the drive) and fix some issues like the
 748          *  above.
 749          *
 750          *  BenH.
 751          */
 752         if (wait_hwif_ready(hwif) == -EBUSY)
 753                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 754
 755         /*
 756          * Second drive should only exist if first drive was found,
 757          * but a lot of cdrom drives are configured as single slaves.
 758          */
 759         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 760                 ide_drive_t *drive = &hwif->drives[unit];
 761                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 762                 (void) probe_for_drive(drive);
 763                 if (drive->present && !hwif->present) {
 764                         hwif->present = 1;
 765                         if (hwif->chipset != ide_4drives ||
 766                             !hwif->mate ||
 767                             !hwif->mate->present) {
 768                                 hwif_register(hwif);
 769                         }
 770                 }
 771         }
 772         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 773                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 774                 u8 stat;
 775
 776                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 777                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 778                 udelay(10);
 779                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 780                 do {
 781                         msleep(50);
 782                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 783                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 784
 785         }
 786         local_irq_restore(flags);
 787         /*
 788          * Use cached IRQ number. It might be (and is...) changed by probe
 789          * code above
 790          */
 791         if (irqd)
 792                 enable_irq(irqd);
 793
 794         if (!hwif->present) {
 795                 ide_hwif_release_regions(hwif);
 796                 return;
 797         }
 798
 799         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 800                 ide_drive_t *drive = &hwif->drives[unit];
 801
 802                 if (drive->present) {
 803                         if (hwif->tuneproc != NULL &&
 804                                 drive->autotune == IDE_TUNE_AUTO)
 805                                 /* auto-tune PIO mode */
 806                                 hwif->tuneproc(drive, 255);
 807                         /*
 808                          * MAJOR HACK BARF :-/
 809                          *
 810                          * FIXME: chipsets own this cruft!
 811                          */
 812                         /*
 813                          * Move here to prevent module loading clashing.
 814                          */
 815         //              drive->autodma = hwif->autodma;
 816                         if ((hwif->ide_dma_check) &&
 817                                 ((drive->autotune == IDE_TUNE_DEFAULT) ||
 818                                 (drive->autotune == IDE_TUNE_AUTO))) {
 819                                 /*
 820                                  * Force DMAing for the beginning of the check.
 821                                  * Some chipsets appear to do interesting
 822                                  * things, if not checked and cleared.
 823                                  *   PARANOIA!!!
 824                                  */
 825                                 hwif->ide_dma_off_quietly(drive);
 826 #ifdef CONFIG_IDEDMA_ONLYDISK
 827                                 if (drive->media == ide_disk)
 828 #endif
 829                                         hwif->ide_dma_check(drive);
 830                         }
 831                 }
 832         }
 833 }
 834
 835 static int hwif_init(ide_hwif_t *hwif);
 836
 837 int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
 838 {
 839         probe_hwif(hwif);
 840
 841         if (fixup)
 842                 fixup(hwif);
 843
 844         if (!hwif_init(hwif)) {
 845                 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
 846                                  hwif->name);
 847                 return -1;
 848         }
 849
 850         if (hwif->present) {
 851                 u16 unit = 0;
 852                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 853                         ide_drive_t *drive = &hwif->drives[unit];
 854                         /* For now don't attach absent drives, we may
 855                            want them on default or a new "empty" class
 856                            for hotplug reprobing ? */
 857                         if (drive->present) {
 858                                 ata_attach(drive);
 859                         }
 860                 }
 861         }
 862         return 0;
 863 }
 864
 865 int probe_hwif_init(ide_hwif_t *hwif)
 866 {
 867         return probe_hwif_init_with_fixup(hwif, NULL);
 868 }
 869
 870 EXPORT_SYMBOL(probe_hwif_init);
 871
 872 #if MAX_HWIFS > 1
 873 /*
 874  * save_match() is used to simplify logic in init_irq() below.
 875  *
 876  * A loophole here is that we may not know about a particular
 877  * hwif's irq until after that hwif is actually probed/initialized..
 878  * This could be a problem for the case where an hwif is on a
 879  * dual interface that requires serialization (eg. cmd640) and another
 880  * hwif using one of the same irqs is initialized beforehand.
 881  *
 882  * This routine detects and reports such situations, but does not fix them.
 883  */
 884 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 885 {
 886         ide_hwif_t *m = *match;
 887
 888         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 889                 if (!new->hwgroup)
 890                         return;
 891                 printk("%s: potential irq problem with %s and %s\n",
 892                         hwif->name, new->name, m->name);
 893         }
 894         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 895                 *match = new;
 896 }
 897 #endif /* MAX_HWIFS > 1 */
 898
 899 /*
 900  * init request queue
 901  */
 902 static int ide_init_queue(ide_drive_t *drive)
 903 {
 904         request_queue_t *q;
 905         ide_hwif_t *hwif = HWIF(drive);
 906         int max_sectors = 256;
 907         int max_sg_entries = PRD_ENTRIES;
 908
 909         /*
 910          *      Our default set up assumes the normal IDE case,
 911          *      that is 64K segmenting, standard PRD setup
 912          *      and LBA28. Some drivers then impose their own
 913          *      limits and LBA48 we could raise it but as yet
 914          *      do not.
 915          */
 916
 917         q = blk_init_queue(do_ide_request, &ide_lock);
 918         if (!q)
 919                 return 1;
 920
 921         q->queuedata = drive;
 922         blk_queue_segment_boundary(q, 0xffff);
 923
 924         if (!hwif->rqsize) {
 925                 if (hwif->no_lba48 || hwif->no_lba48_dma)
 926                         hwif->rqsize = 256;
 927                 else
 928                         hwif->rqsize = 65536;
 929         }
 930         if (hwif->rqsize < max_sectors)
 931                 max_sectors = hwif->rqsize;
 932         blk_queue_max_sectors(q, max_sectors);
 933
 934 #ifdef CONFIG_PCI
 935         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 936          * creates segments that don't completely match our boundary
 937          * requirements and thus need to be broken up again. Because it
 938          * doesn't align properly either, we may actually have to break up
 939          * to more segments than what was we got in the first place, a max
 940          * worst case is twice as many.
 941          * This will be fixed once we teach pci_map_sg() about our boundary
 942          * requirements, hopefully soon. *FIXME*
 943          */
 944         if (!PCI_DMA_BUS_IS_PHYS)
 945                 max_sg_entries >>= 1;
 946 #endif /* CONFIG_PCI */
 947
 948         blk_queue_max_hw_segments(q, max_sg_entries);
 949         blk_queue_max_phys_segments(q, max_sg_entries);
 950
 951         /* assign drive and gendisk queue */
 952         drive->queue = q;
 953         if (drive->disk)
 954                 drive->disk->queue = drive->queue;
 955
 956         /* needs drive->queue to be set */
 957         ide_toggle_bounce(drive, 1);
 958
 959         /* enable led activity for disk drives only */
 960         if (drive->media == ide_disk && hwif->led_act)
 961                 blk_queue_activity_fn(q, hwif->led_act, drive);
 962
 963         return 0;
 964 }
 965
 966 /*
 967  * This routine sets up the irq for an ide interface, and creates a new
 968  * hwgroup for the irq/hwif if none was previously assigned.
 969  *
 970  * Much of the code is for correctly detecting/handling irq sharing
 971  * and irq serialization situations.  This is somewhat complex because
 972  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 973  *
 974  * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
 975  * interrupts completely disabled.  This can be bad for interrupt latency,
 976  * but anything else has led to problems on some machines.  We re-enable
 977  * interrupts as much as we can safely do in most places.
 978  */
 979 static int init_irq (ide_hwif_t *hwif)
 980 {
 981         unsigned int index;
 982         ide_hwgroup_t *hwgroup;
 983         ide_hwif_t *match = NULL;
 984
 985
 986         BUG_ON(in_interrupt());
 987         BUG_ON(irqs_disabled());
 988         down(&ide_cfg_sem);
 989         hwif->hwgroup = NULL;
 990 #if MAX_HWIFS > 1
 991         /*
 992          * Group up with any other hwifs that share our irq(s).
 993          */
 994         for (index = 0; index < MAX_HWIFS; index++) {
 995                 ide_hwif_t *h = &ide_hwifs[index];
 996                 if (h->hwgroup) {  /* scan only initialized hwif's */
 997                         if (hwif->irq == h->irq) {
 998                                 hwif->sharing_irq = h->sharing_irq = 1;
 999                                 if (hwif->chipset != ide_pci ||
1000                                     h->chipset != ide_pci) {
1001                                         save_match(hwif, h, &match);
1002                                 }
1003                         }
1004                         if (hwif->serialized) {
1005                                 if (hwif->mate && hwif->mate->irq == h->irq)
1006                                         save_match(hwif, h, &match);
1007                         }
1008                         if (h->serialized) {
1009                                 if (h->mate && hwif->irq == h->mate->irq)
1010                                         save_match(hwif, h, &match);
1011                         }
1012                 }
1013         }
1014 #endif /* MAX_HWIFS > 1 */
1015         /*
1016          * If we are still without a hwgroup, then form a new one
1017          */
1018         if (match) {
1019                 hwgroup = match->hwgroup;
1020                 hwif->hwgroup = hwgroup;
1021                 /*
1022                  * Link us into the hwgroup.
1023                  * This must be done early, do ensure that unexpected_intr
1024                  * can find the hwif and prevent irq storms.
1025                  * No drives are attached to the new hwif, choose_drive
1026                  * can't do anything stupid (yet).
1027                  * Add ourself as the 2nd entry to the hwgroup->hwif
1028                  * linked list, the first entry is the hwif that owns
1029                  * hwgroup->handler - do not change that.
1030                  */
1031                 spin_lock_irq(&ide_lock);
1032                 hwif->next = hwgroup->hwif->next;
1033                 hwgroup->hwif->next = hwif;
1034                 spin_unlock_irq(&ide_lock);
1035         } else {
1036                 hwgroup = kmalloc(sizeof(ide_hwgroup_t),GFP_KERNEL);
1037                 if (!hwgroup)
1038                         goto out_up;
1039
1040                 hwif->hwgroup = hwgroup;
1041
1042                 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1043                 hwgroup->hwif     = hwif->next = hwif;
1044                 hwgroup->rq       = NULL;
1045                 hwgroup->handler  = NULL;
1046                 hwgroup->drive    = NULL;
1047                 hwgroup->busy     = 0;
1048                 init_timer(&hwgroup->timer);
1049                 hwgroup->timer.function = &ide_timer_expiry;
1050                 hwgroup->timer.data = (unsigned long) hwgroup;
1051         }
1052
1053         /*
1054          * Allocate the irq, if not already obtained for another hwif
1055          */
1056         if (!match || match->irq != hwif->irq) {
1057                 int sa = SA_INTERRUPT;
1058 #if defined(__mc68000__) || defined(CONFIG_APUS)
1059                 sa = SA_SHIRQ;
1060 #endif /* __mc68000__ || CONFIG_APUS */
1061
1062                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1063                         sa = SA_SHIRQ;
1064 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1065                         sa |= SA_INTERRUPT;
1066 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1067                 }
1068
1069                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1070                         /* clear nIEN */
1071                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1072
1073                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1074                         goto out_unlink;
1075         }
1076
1077         /*
1078          * For any present drive:
1079          * - allocate the block device queue
1080          * - link drive into the hwgroup
1081          */
1082         for (index = 0; index < MAX_DRIVES; ++index) {
1083                 ide_drive_t *drive = &hwif->drives[index];
1084                 if (!drive->present)
1085                         continue;
1086                 if (ide_init_queue(drive)) {
1087                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1088                         continue;
1089                 }
1090                 spin_lock_irq(&ide_lock);
1091                 if (!hwgroup->drive) {
1092                         /* first drive for hwgroup. */
1093                         drive->next = drive;
1094                         hwgroup->drive = drive;
1095                         hwgroup->hwif = HWIF(hwgroup->drive);
1096                 } else {
1097                         drive->next = hwgroup->drive->next;
1098                         hwgroup->drive->next = drive;
1099                 }
1100                 spin_unlock_irq(&ide_lock);
1101         }
1102
1103 #if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
1104         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1105                 hwif->io_ports[IDE_DATA_OFFSET],
1106                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1107                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1108 #elif defined(__sparc__)
1109         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
1110                 hwif->io_ports[IDE_DATA_OFFSET],
1111                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1112                 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
1113 #else
1114         printk("%s at 0x%08lx on irq %d", hwif->name,
1115                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1116 #endif /* __mc68000__ && CONFIG_APUS */
1117         if (match)
1118                 printk(" (%sed with %s)",
1119                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1120         printk("\n");
1121         up(&ide_cfg_sem);
1122         return 0;
1123 out_unlink:
1124         spin_lock_irq(&ide_lock);
1125         if (hwif->next == hwif) {
1126                 BUG_ON(match);
1127                 BUG_ON(hwgroup->hwif != hwif);
1128                 kfree(hwgroup);
1129         } else {
1130                 ide_hwif_t *g;
1131                 g = hwgroup->hwif;
1132                 while (g->next != hwif)
1133                         g = g->next;
1134                 g->next = hwif->next;
1135                 if (hwgroup->hwif == hwif) {
1136                         /* Impossible. */
1137                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1138                         hwgroup->hwif = g;
1139                 }
1140                 BUG_ON(hwgroup->hwif == hwif);
1141         }
1142         spin_unlock_irq(&ide_lock);
1143 out_up:
1144         up(&ide_cfg_sem);
1145         return 1;
1146 }
1147
1148 static int ata_lock(dev_t dev, void *data)
1149 {
1150         /* FIXME: we want to pin hwif down */
1151         return 0;
1152 }
1153
1154 extern ide_driver_t idedefault_driver;
1155
1156 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1157 {
1158         ide_hwif_t *hwif = data;
1159         int unit = *part >> PARTN_BITS;
1160         ide_drive_t *drive = &hwif->drives[unit];
1161         if (!drive->present)
1162                 return NULL;
1163         if (drive->driver == &idedefault_driver) {
1164                 if (drive->media == ide_disk)
1165                         (void) request_module("ide-disk");
1166                 if (drive->scsi)
1167                         (void) request_module("ide-scsi");
1168                 if (drive->media == ide_cdrom || drive->media == ide_optical)
1169                         (void) request_module("ide-cd");
1170                 if (drive->media == ide_tape)
1171                         (void) request_module("ide-tape");
1172                 if (drive->media == ide_floppy)
1173                         (void) request_module("ide-floppy");
1174         }
1175         if (drive->driver == &idedefault_driver)
1176                 return NULL;
1177         *part &= (1 << PARTN_BITS) - 1;
1178         return get_disk(drive->disk);
1179 }
1180
1181 static int alloc_disks(ide_hwif_t *hwif)
1182 {
1183         unsigned int unit;
1184         struct gendisk *disks[MAX_DRIVES];
1185
1186         for (unit = 0; unit < MAX_DRIVES; unit++) {
1187                 disks[unit] = alloc_disk(1 << PARTN_BITS);
1188                 if (!disks[unit])
1189                         goto Enomem;
1190         }
1191         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1192                 ide_drive_t *drive = &hwif->drives[unit];
1193                 struct gendisk *disk = disks[unit];
1194                 disk->major  = hwif->major;
1195                 disk->first_minor = unit << PARTN_BITS;
1196                 sprintf(disk->disk_name,"hd%c",'a'+hwif->index*MAX_DRIVES+unit);
1197                 disk->fops = ide_fops;
1198                 disk->private_data = drive;
1199                 drive->disk = disk;
1200         }
1201         return 0;
1202 Enomem:
1203         printk(KERN_WARNING "(ide::init_gendisk) Out of memory\n");
1204         while (unit--)
1205                 put_disk(disks[unit]);
1206         return -ENOMEM;
1207 }
1208
1209 static void drive_release_dev (struct device *dev)
1210 {
1211         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1212
1213         up(&drive->gendev_rel_sem);
1214 }
1215
1216 /*
1217  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1218  * after probing for drives, to allocate partition tables and other data
1219  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1220  * somewhat later, during the partition check.
1221  */
1222 static void init_gendisk (ide_hwif_t *hwif)
1223 {
1224         unsigned int unit;
1225
1226         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1227                 ide_drive_t * drive = &hwif->drives[unit];
1228                 ide_add_generic_settings(drive);
1229                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1230                          hwif->index,unit);
1231                 drive->gendev.parent = &hwif->gendev;
1232                 drive->gendev.bus = &ide_bus_type;
1233                 drive->gendev.driver_data = drive;
1234                 drive->gendev.release = drive_release_dev;
1235                 if (drive->present) {
1236                         device_register(&drive->gendev);
1237                         sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
1238                                 (hwif->channel && hwif->mate) ?
1239                                 hwif->mate->index : hwif->index,
1240                                 hwif->channel, unit, drive->lun);
1241                 }
1242         }
1243         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1244                         THIS_MODULE, ata_probe, ata_lock, hwif);
1245 }
1246
1247 static int hwif_init(ide_hwif_t *hwif)
1248 {
1249         int old_irq, unit;
1250
1251         /* Return success if no device is connected */
1252         if (!hwif->present)
1253                 return 1;
1254
1255         if (!hwif->irq) {
1256                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1257                 {
1258                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1259                         return (hwif->present = 0);
1260                 }
1261         }
1262 #ifdef CONFIG_BLK_DEV_HD
1263         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1264                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1265                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1266                 return (hwif->present = 0);
1267         }
1268 #endif /* CONFIG_BLK_DEV_HD */
1269
1270         /* we set it back to 1 if all is ok below */
1271         hwif->present = 0;
1272
1273         if (register_blkdev(hwif->major, hwif->name))
1274                 return 0;
1275
1276         if (!hwif->sg_max_nents)
1277                 hwif->sg_max_nents = PRD_ENTRIES;
1278
1279         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1280                                  GFP_KERNEL);
1281         if (!hwif->sg_table) {
1282                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1283                 goto out;
1284         }
1285
1286         if (alloc_disks(hwif) < 0)
1287                 goto out;
1288
1289         if (init_irq(hwif) == 0)
1290                 goto done;
1291
1292         old_irq = hwif->irq;
1293         /*
1294          *      It failed to initialise. Find the default IRQ for
1295          *      this port and try that.
1296          */
1297         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1298                 printk("%s: Disabled unable to get IRQ %d.\n",
1299                         hwif->name, old_irq);
1300                 goto out_disks;
1301         }
1302         if (init_irq(hwif)) {
1303                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1304                         hwif->name, old_irq, hwif->irq);
1305                 goto out_disks;
1306         }
1307         printk("%s: probed IRQ %d failed, using default.\n",
1308                 hwif->name, hwif->irq);
1309
1310 done:
1311         init_gendisk(hwif);
1312         hwif->present = 1;      /* success */
1313         return 1;
1314
1315 out_disks:
1316         for (unit = 0; unit < MAX_DRIVES; unit++) {
1317                 struct gendisk *disk = hwif->drives[unit].disk;
1318                 hwif->drives[unit].disk = NULL;
1319                 put_disk(disk);
1320         }
1321 out:
1322         unregister_blkdev(hwif->major, hwif->name);
1323         return 0;
1324 }
1325
1326 int ideprobe_init (void)
1327 {
1328         unsigned int index;
1329         int probe[MAX_HWIFS];
1330
1331         memset(probe, 0, MAX_HWIFS * sizeof(int));
1332         for (index = 0; index < MAX_HWIFS; ++index)
1333                 probe[index] = !ide_hwifs[index].present;
1334
1335         for (index = 0; index < MAX_HWIFS; ++index)
1336                 if (probe[index])
1337                         probe_hwif(&ide_hwifs[index]);
1338         for (index = 0; index < MAX_HWIFS; ++index)
1339                 if (probe[index])
1340                         hwif_init(&ide_hwifs[index]);
1341         for (index = 0; index < MAX_HWIFS; ++index) {
1342                 if (probe[index]) {
1343                         ide_hwif_t *hwif = &ide_hwifs[index];
1344                         int unit;
1345                         if (!hwif->present)
1346                                 continue;
1347                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1348                                 hwif->chipset = ide_generic;
1349                         for (unit = 0; unit < MAX_DRIVES; ++unit)
1350                                 if (hwif->drives[unit].present)
1351                                         ata_attach(&hwif->drives[unit]);
1352                 }
1353         }
1354         return 0;
1355 }
1356
1357 EXPORT_SYMBOL_GPL(ideprobe_init);