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 #ifdef CONFIG_BLK_DEV_PDC4030
 184                 if (hwif->channel == 1 && hwif->chipset == ide_pdc4030) {
 185                         printk(" -- not supported on 2nd Promise port\n");
 186                         goto err_misc;
 187                 }
 188 #endif /* CONFIG_BLK_DEV_PDC4030 */
 189                 switch (type) {
 190                         case ide_floppy:
 191                                 if (!strstr(id->model, "CD-ROM")) {
 192                                         if (!strstr(id->model, "oppy") &&
 193                                             !strstr(id->model, "poyp") &&
 194                                             !strstr(id->model, "ZIP"))
 195                                                 printk("cdrom or floppy?, assuming ");
 196                                         if (drive->media != ide_cdrom) {
 197                                                 printk ("FLOPPY");
 198                                                 drive->removable = 1;
 199                                                 break;
 200                                         }
 201                                 }
 202                                 /* Early cdrom models used zero */
 203                                 type = ide_cdrom;
 204                         case ide_cdrom:
 205                                 drive->removable = 1;
 206 #ifdef CONFIG_PPC
 207                                 /* kludge for Apple PowerBook internal zip */
 208                                 if (!strstr(id->model, "CD-ROM") &&
 209                                     strstr(id->model, "ZIP")) {
 210                                         printk ("FLOPPY");
 211                                         type = ide_floppy;
 212                                         break;
 213                                 }
 214 #endif
 215                                 printk ("CD/DVD-ROM");
 216                                 break;
 217                         case ide_tape:
 218                                 printk ("TAPE");
 219                                 break;
 220                         case ide_optical:
 221                                 printk ("OPTICAL");
 222                                 drive->removable = 1;
 223                                 break;
 224                         default:
 225                                 printk("UNKNOWN (type %d)", type);
 226                                 break;
 227                 }
 228                 printk (" drive\n");
 229                 drive->media = type;
 230                 return;
 231         }
 232
 233         /*
 234          * Not an ATAPI device: looks like a "regular" hard disk
 235          */
 236         if (id->config & (1<<7))
 237                 drive->removable = 1;
 238
 239         if (drive_is_flashcard(drive))
 240                 drive->is_flash = 1;
 241         drive->media = ide_disk;
 242         printk("%s DISK drive\n", (drive->is_flash) ? "CFA" : "ATA" );
 243         QUIRK_LIST(drive);
 244         return;
 245
 246 err_misc:
 247         kfree(id);
 248         drive->present = 0;
 249         return;
 250 }
 251
 252 /**
 253  *      actual_try_to_identify  -       send ata/atapi identify
 254  *      @drive: drive to identify
 255  *      @cmd: command to use
 256  *
 257  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 258  *      and waits for a response.  It also monitors irqs while this is
 259  *      happening, in hope of automatically determining which one is
 260  *      being used by the interface.
 261  *
 262  *      Returns:        0  device was identified
 263  *                      1  device timed-out (no response to identify request)
 264  *                      2  device aborted the command (refused to identify itself)
 265  */
 266
 267 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 268 {
 269         ide_hwif_t *hwif = HWIF(drive);
 270         int rc;
 271         unsigned long hd_status;
 272         unsigned long timeout;
 273         u8 s = 0, a = 0;
 274
 275         /* take a deep breath */
 276         msleep(50);
 277
 278         if (IDE_CONTROL_REG) {
 279                 a = hwif->INB(IDE_ALTSTATUS_REG);
 280                 s = hwif->INB(IDE_STATUS_REG);
 281                 if ((a ^ s) & ~INDEX_STAT) {
 282                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 283                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 284                         /* ancient Seagate drives, broken interfaces */
 285                         hd_status = IDE_STATUS_REG;
 286                 } else {
 287                         /* use non-intrusive polling */
 288                         hd_status = IDE_ALTSTATUS_REG;
 289                 }
 290         } else
 291                 hd_status = IDE_STATUS_REG;
 292
 293         /* set features register for atapi
 294          * identify command to be sure of reply
 295          */
 296         if ((cmd == WIN_PIDENTIFY))
 297                 /* disable dma & overlap */
 298                 hwif->OUTB(0, IDE_FEATURE_REG);
 299
 300         if (hwif->identify != NULL) {
 301                 if (hwif->identify(drive))
 302                         return 1;
 303         } else {
 304                 /* ask drive for ID */
 305                 hwif->OUTB(cmd, IDE_COMMAND_REG);
 306         }
 307         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 308         timeout += jiffies;
 309         do {
 310                 if (time_after(jiffies, timeout)) {
 311                         /* drive timed-out */
 312                         return 1;
 313                 }
 314                 /* give drive a breather */
 315                 msleep(50);
 316         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 317
 318         /* wait for IRQ and DRQ_STAT */
 319         msleep(50);
 320         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 321                 unsigned long flags;
 322
 323                 /* local CPU only; some systems need this */
 324                 local_irq_save(flags);
 325                 /* drive returned ID */
 326                 do_identify(drive, cmd);
 327                 /* drive responded with ID */
 328                 rc = 0;
 329                 /* clear drive IRQ */
 330                 (void) hwif->INB(IDE_STATUS_REG);
 331                 local_irq_restore(flags);
 332         } else {
 333                 /* drive refused ID */
 334                 rc = 2;
 335         }
 336         return rc;
 337 }
 338
 339 /**
 340  *      try_to_identify -       try to identify a drive
 341  *      @drive: drive to probe
 342  *      @cmd: command to use
 343  *
 344  *      Issue the identify command and then do IRQ probing to
 345  *      complete the identification when needed by finding the
 346  *      IRQ the drive is attached to
 347  */
 348
 349 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 350 {
 351         ide_hwif_t *hwif = HWIF(drive);
 352         int retval;
 353         int autoprobe = 0;
 354         unsigned long cookie = 0;
 355
 356         /*
 357          * Disable device irq unless we need to
 358          * probe for it. Otherwise we'll get spurious
 359          * interrupts during the identify-phase that
 360          * the irq handler isn't expecting.
 361          */
 362         if (IDE_CONTROL_REG) {
 363                 u8 ctl = drive->ctl | 2;
 364                 if (!hwif->irq) {
 365                         autoprobe = 1;
 366                         cookie = probe_irq_on();
 367                         /* enable device irq */
 368                         ctl &= ~2;
 369                 }
 370                 hwif->OUTB(ctl, IDE_CONTROL_REG);
 371         }
 372
 373         retval = actual_try_to_identify(drive, cmd);
 374
 375         if (autoprobe) {
 376                 int irq;
 377                 /* mask device irq */
 378                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 379                 /* clear drive IRQ */
 380                 (void) hwif->INB(IDE_STATUS_REG);
 381                 udelay(5);
 382                 irq = probe_irq_off(cookie);
 383                 if (!hwif->irq) {
 384                         if (irq > 0) {
 385                                 hwif->irq = irq;
 386                         } else {
 387                                 /* Mmmm.. multiple IRQs..
 388                                  * don't know which was ours
 389                                  */
 390                                 printk("%s: IRQ probe failed (0x%lx)\n",
 391                                         drive->name, cookie);
 392                         }
 393                 }
 394         }
 395         return retval;
 396 }
 397
 398
 399 /**
 400  *      do_probe                -       probe an IDE device
 401  *      @drive: drive to probe
 402  *      @cmd: command to use
 403  *
 404  *      do_probe() has the difficult job of finding a drive if it exists,
 405  *      without getting hung up if it doesn't exist, without trampling on
 406  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 407  *
 408  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 409  *      but does not respond right away, the probe will "hang in there"
 410  *      for the maximum wait time (about 30 seconds), otherwise it will
 411  *      exit much more quickly.
 412  *
 413  * Returns:     0  device was identified
 414  *              1  device timed-out (no response to identify request)
 415  *              2  device aborted the command (refused to identify itself)
 416  *              3  bad status from device (possible for ATAPI drives)
 417  *              4  probe was not attempted because failure was obvious
 418  */
 419
 420 static int do_probe (ide_drive_t *drive, u8 cmd)
 421 {
 422         int rc;
 423         ide_hwif_t *hwif = HWIF(drive);
 424
 425         if (drive->present) {
 426                 /* avoid waiting for inappropriate probes */
 427                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 428                         return 4;
 429         }
 430 #ifdef DEBUG
 431         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 432                 drive->name, drive->present, drive->media,
 433                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 434 #endif
 435
 436         /* needed for some systems
 437          * (e.g. crw9624 as drive0 with disk as slave)
 438          */
 439         msleep(50);
 440         SELECT_DRIVE(drive);
 441         msleep(50);
 442         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 443                 if (drive->select.b.unit != 0) {
 444                         /* exit with drive0 selected */
 445                         SELECT_DRIVE(&hwif->drives[0]);
 446                         /* allow BUSY_STAT to assert & clear */
 447                         msleep(50);
 448                 }
 449                 /* no i/f present: mmm.. this should be a 4 -ml */
 450                 return 3;
 451         }
 452
 453         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 454             drive->present || cmd == WIN_PIDENTIFY) {
 455                 /* send cmd and wait */
 456                 if ((rc = try_to_identify(drive, cmd))) {
 457                         /* failed: try again */
 458                         rc = try_to_identify(drive,cmd);
 459                 }
 460                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 461                         return 4;
 462
 463                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 464                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 465                         (drive->autotune == IDE_TUNE_AUTO))) {
 466                         unsigned long timeout;
 467                         printk("%s: no response (status = 0x%02x), "
 468                                 "resetting drive\n", drive->name,
 469                                 hwif->INB(IDE_STATUS_REG));
 470                         msleep(50);
 471                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 472                         msleep(50);
 473                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 474                         timeout = jiffies;
 475                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
 476                                time_before(jiffies, timeout + WAIT_WORSTCASE))
 477                                 msleep(50);
 478                         rc = try_to_identify(drive, cmd);
 479                 }
 480                 if (rc == 1)
 481                         printk("%s: no response (status = 0x%02x)\n",
 482                                 drive->name, hwif->INB(IDE_STATUS_REG));
 483                 /* ensure drive irq is clear */
 484                 (void) hwif->INB(IDE_STATUS_REG);
 485         } else {
 486                 /* not present or maybe ATAPI */
 487                 rc = 3;
 488         }
 489         if (drive->select.b.unit != 0) {
 490                 /* exit with drive0 selected */
 491                 SELECT_DRIVE(&hwif->drives[0]);
 492                 msleep(50);
 493                 /* ensure drive irq is clear */
 494                 (void) hwif->INB(IDE_STATUS_REG);
 495         }
 496         return rc;
 497 }
 498
 499 /*
 500  *
 501  */
 502 static void enable_nest (ide_drive_t *drive)
 503 {
 504         ide_hwif_t *hwif = HWIF(drive);
 505         unsigned long timeout;
 506
 507         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 508         SELECT_DRIVE(drive);
 509         msleep(50);
 510         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 511         timeout = jiffies + WAIT_WORSTCASE;
 512         do {
 513                 if (time_after(jiffies, timeout)) {
 514                         printk("failed (timeout)\n");
 515                         return;
 516                 }
 517                 msleep(50);
 518         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 519
 520         msleep(50);
 521
 522         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 523                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 524         } else {
 525                 printk("success\n");
 526         }
 527
 528         /* if !(success||timed-out) */
 529         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 530                 /* look for ATAPI device */
 531                 (void) do_probe(drive, WIN_PIDENTIFY);
 532         }
 533 }
 534
 535 /**
 536  *      probe_for_drives        -       upper level drive probe
 537  *      @drive: drive to probe for
 538  *
 539  *      probe_for_drive() tests for existence of a given drive using do_probe()
 540  *      and presents things to the user as needed.
 541  *
 542  *      Returns:        0  no device was found
 543  *                      1  device was found (note: drive->present might
 544  *                         still be 0)
 545  */
 546
 547 static inline u8 probe_for_drive (ide_drive_t *drive)
 548 {
 549         /*
 550          *      In order to keep things simple we have an id
 551          *      block for all drives at all times. If the device
 552          *      is pre ATA or refuses ATA/ATAPI identify we
 553          *      will add faked data to this.
 554          *
 555          *      Also note that 0 everywhere means "can't do X"
 556          */
 557
 558         drive->id = kmalloc(SECTOR_WORDS *4, GFP_KERNEL);
 559         drive->id_read = 0;
 560         if(drive->id == NULL)
 561         {
 562                 printk(KERN_ERR "ide: out of memory for id data.\n");
 563                 return 0;
 564         }
 565         memset(drive->id, 0, SECTOR_WORDS * 4);
 566         strcpy(drive->id->model, "UNKNOWN");
 567
 568         /* skip probing? */
 569         if (!drive->noprobe)
 570         {
 571                 /* if !(success||timed-out) */
 572                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 573                         /* look for ATAPI device */
 574                         (void) do_probe(drive, WIN_PIDENTIFY);
 575                 }
 576                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 577                         enable_nest(drive);
 578                 if (!drive->present)
 579                         /* drive not found */
 580                         return 0;
 581
 582                 /* identification failed? */
 583                 if (!drive->id_read) {
 584                         if (drive->media == ide_disk) {
 585                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 586                                         drive->name, drive->cyl,
 587                                         drive->head, drive->sect);
 588                         } else if (drive->media == ide_cdrom) {
 589                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 590                         } else {
 591                                 /* nuke it */
 592                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 593                                 drive->present = 0;
 594                         }
 595                 }
 596                 /* drive was found */
 597         }
 598         if(!drive->present)
 599                 return 0;
 600         /* The drive wasn't being helpful. Add generic info only */
 601         if(!drive->id_read)
 602                 generic_id(drive);
 603         return drive->present;
 604 }
 605
 606 static void hwif_release_dev (struct device *dev)
 607 {
 608         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 609
 610         up(&hwif->gendev_rel_sem);
 611 }
 612
 613 static void hwif_register (ide_hwif_t *hwif)
 614 {
 615         /* register with global device tree */
 616         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 617         hwif->gendev.driver_data = hwif;
 618         if (hwif->gendev.parent == NULL) {
 619                 if (hwif->pci_dev)
 620                         hwif->gendev.parent = &hwif->pci_dev->dev;
 621                 else
 622                         /* Would like to do = &device_legacy */
 623                         hwif->gendev.parent = NULL;
 624         }
 625         hwif->gendev.release = hwif_release_dev;
 626         device_register(&hwif->gendev);
 627 }
 628
 629 static int wait_hwif_ready(ide_hwif_t *hwif)
 630 {
 631         int rc;
 632
 633         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 634
 635         /* Let HW settle down a bit from whatever init state we
 636          * come from */
 637         mdelay(2);
 638
 639         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 640          * I know of at least one disk who takes 31 seconds, I use 35
 641          * here to be safe
 642          */
 643         rc = ide_wait_not_busy(hwif, 35000);
 644         if (rc)
 645                 return rc;
 646
 647         /* Now make sure both master & slave are ready */
 648         SELECT_DRIVE(&hwif->drives[0]);
 649         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 650         mdelay(2);
 651         rc = ide_wait_not_busy(hwif, 10000);
 652         if (rc)
 653                 return rc;
 654         SELECT_DRIVE(&hwif->drives[1]);
 655         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 656         mdelay(2);
 657         rc = ide_wait_not_busy(hwif, 10000);
 658
 659         /* Exit function with master reselected (let's be sane) */
 660         SELECT_DRIVE(&hwif->drives[0]);
 661
 662         return rc;
 663 }
 664
 665 /*
 666  * This routine only knows how to look for drive units 0 and 1
 667  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 668  */
 669 static void probe_hwif(ide_hwif_t *hwif)
 670 {
 671         unsigned int unit;
 672         unsigned long flags;
 673         unsigned int irqd;
 674
 675         if (hwif->noprobe)
 676                 return;
 677
 678         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 679 #ifdef CONFIG_BLK_DEV_PDC4030
 680             (hwif->chipset != ide_pdc4030 || hwif->channel == 0) &&
 681 #endif /* CONFIG_BLK_DEV_PDC4030 */
 682             (ide_hwif_request_regions(hwif))) {
 683                 u16 msgout = 0;
 684                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 685                         ide_drive_t *drive = &hwif->drives[unit];
 686                         if (drive->present) {
 687                                 drive->present = 0;
 688                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 689                                         drive->name);
 690                                 msgout = 1;
 691                         }
 692                 }
 693                 if (!msgout)
 694                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 695                                 hwif->name);
 696                 return;
 697         }
 698
 699         /*
 700          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 701          * we'll install our IRQ driver much later...
 702          */
 703         irqd = hwif->irq;
 704         if (irqd)
 705                 disable_irq(hwif->irq);
 706
 707         local_irq_set(flags);
 708
 709         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 710          * platforms. Typical cases are:
 711          *
 712          *  - The firmware hard reset the disk before booting the kernel,
 713          *    the drive is still doing it's poweron-reset sequence, that
 714          *    can take up to 30 seconds
 715          *  - The firmware does nothing (or no firmware), the device is
 716          *    still in POST state (same as above actually).
 717          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 718          *    their reset sequence even when they are non-selected slave
 719          *    devices, thus preventing discovery of the main HD
 720          *
 721          *  Doing this wait-for-busy should not harm any existing configuration
 722          *  (at least things won't be worse than what current code does, that
 723          *  is blindly go & talk to the drive) and fix some issues like the
 724          *  above.
 725          *
 726          *  BenH.
 727          */
 728         if (wait_hwif_ready(hwif))
 729                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 730
 731         /*
 732          * Second drive should only exist if first drive was found,
 733          * but a lot of cdrom drives are configured as single slaves.
 734          */
 735         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 736                 ide_drive_t *drive = &hwif->drives[unit];
 737                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 738                 (void) probe_for_drive(drive);
 739                 if (drive->present && hwif->present && unit == 1) {
 740                         if (strcmp(hwif->drives[0].id->model, drive->id->model) == 0 &&
 741                             /* Don't do this for noprobe or non ATA */
 742                             strcmp(drive->id->model, "UNKNOWN") &&
 743                             /* And beware of confused Maxtor drives that go "M0000000000"
 744                               "The SN# is garbage in the ID block..." [Eric] */
 745                             strncmp(drive->id->serial_no, "M0000000000000000000", 20) &&
 746                             strncmp(hwif->drives[0].id->serial_no, drive->id->serial_no, 20) == 0) {
 747                                 printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 748                                 drive->present = 0;
 749                         }
 750                 }
 751                 if (drive->present && !hwif->present) {
 752                         hwif->present = 1;
 753                         if (hwif->chipset != ide_4drives ||
 754                             !hwif->mate ||
 755                             !hwif->mate->present) {
 756                                 hwif_register(hwif);
 757                         }
 758                 }
 759         }
 760         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 761                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 762                 u8 stat;
 763
 764                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 765                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 766                 udelay(10);
 767                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 768                 do {
 769                         msleep(50);
 770                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 771                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 772
 773         }
 774         local_irq_restore(flags);
 775         /*
 776          * Use cached IRQ number. It might be (and is...) changed by probe
 777          * code above
 778          */
 779         if (irqd)
 780                 enable_irq(irqd);
 781
 782         if (!hwif->present) {
 783                 ide_hwif_release_regions(hwif);
 784                 return;
 785         }
 786
 787         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 788                 ide_drive_t *drive = &hwif->drives[unit];
 789
 790                 if (drive->present) {
 791                         if (hwif->tuneproc != NULL &&
 792                                 drive->autotune == IDE_TUNE_AUTO)
 793                                 /* auto-tune PIO mode */
 794                                 hwif->tuneproc(drive, 255);
 795                         /*
 796                          * MAJOR HACK BARF :-/
 797                          *
 798                          * FIXME: chipsets own this cruft!
 799                          */
 800                         /*
 801                          * Move here to prevent module loading clashing.
 802                          */
 803         //              drive->autodma = hwif->autodma;
 804                         if ((hwif->ide_dma_check) &&
 805                                 ((drive->autotune == IDE_TUNE_DEFAULT) ||
 806                                 (drive->autotune == IDE_TUNE_AUTO))) {
 807                                 /*
 808                                  * Force DMAing for the beginning of the check.
 809                                  * Some chipsets appear to do interesting
 810                                  * things, if not checked and cleared.
 811                                  *   PARANOIA!!!
 812                                  */
 813                                 hwif->ide_dma_off_quietly(drive);
 814 #ifdef CONFIG_IDEDMA_ONLYDISK
 815                                 if (drive->media == ide_disk)
 816 #endif
 817                                         hwif->ide_dma_check(drive);
 818                         }
 819                 }
 820         }
 821 }
 822
 823 static int hwif_init(ide_hwif_t *hwif);
 824 int probe_hwif_init (ide_hwif_t *hwif)
 825 {
 826         probe_hwif(hwif);
 827         hwif_init(hwif);
 828
 829         if (hwif->present) {
 830                 u16 unit = 0;
 831                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 832                         ide_drive_t *drive = &hwif->drives[unit];
 833                         /* For now don't attach absent drives, we may
 834                            want them on default or a new "empty" class
 835                            for hotplug reprobing ? */
 836                         if (drive->present) {
 837                                 ata_attach(drive);
 838                         }
 839                 }
 840         }
 841         return 0;
 842 }
 843
 844 EXPORT_SYMBOL(probe_hwif_init);
 845
 846 #if MAX_HWIFS > 1
 847 /*
 848  * save_match() is used to simplify logic in init_irq() below.
 849  *
 850  * A loophole here is that we may not know about a particular
 851  * hwif's irq until after that hwif is actually probed/initialized..
 852  * This could be a problem for the case where an hwif is on a
 853  * dual interface that requires serialization (eg. cmd640) and another
 854  * hwif using one of the same irqs is initialized beforehand.
 855  *
 856  * This routine detects and reports such situations, but does not fix them.
 857  */
 858 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 859 {
 860         ide_hwif_t *m = *match;
 861
 862         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 863                 if (!new->hwgroup)
 864                         return;
 865                 printk("%s: potential irq problem with %s and %s\n",
 866                         hwif->name, new->name, m->name);
 867         }
 868         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 869                 *match = new;
 870 }
 871 #endif /* MAX_HWIFS > 1 */
 872
 873 /*
 874  * init request queue
 875  */
 876 static int ide_init_queue(ide_drive_t *drive)
 877 {
 878         request_queue_t *q;
 879         ide_hwif_t *hwif = HWIF(drive);
 880         int max_sectors = 256;
 881         int max_sg_entries = PRD_ENTRIES;
 882
 883         /*
 884          *      Our default set up assumes the normal IDE case,
 885          *      that is 64K segmenting, standard PRD setup
 886          *      and LBA28. Some drivers then impose their own
 887          *      limits and LBA48 we could raise it but as yet
 888          *      do not.
 889          */
 890
 891         q = blk_init_queue(do_ide_request, &ide_lock);
 892         if (!q)
 893                 return 1;
 894
 895         q->queuedata = drive;
 896         blk_queue_segment_boundary(q, 0xffff);
 897
 898         if (!hwif->rqsize) {
 899                 if (hwif->no_lba48 || hwif->no_lba48_dma)
 900                         hwif->rqsize = 256;
 901                 else
 902                         hwif->rqsize = 65536;
 903         }
 904         if (hwif->rqsize < max_sectors)
 905                 max_sectors = hwif->rqsize;
 906         blk_queue_max_sectors(q, max_sectors);
 907
 908 #ifdef CONFIG_PCI
 909         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 910          * creates segments that don't completely match our boundary
 911          * requirements and thus need to be broken up again. Because it
 912          * doesn't align properly either, we may actually have to break up
 913          * to more segments than what was we got in the first place, a max
 914          * worst case is twice as many.
 915          * This will be fixed once we teach pci_map_sg() about our boundary
 916          * requirements, hopefully soon. *FIXME*
 917          */
 918         if (!PCI_DMA_BUS_IS_PHYS)
 919                 max_sg_entries >>= 1;
 920 #endif /* CONFIG_PCI */
 921
 922         blk_queue_max_hw_segments(q, max_sg_entries);
 923         blk_queue_max_phys_segments(q, max_sg_entries);
 924
 925         /* assign drive and gendisk queue */
 926         drive->queue = q;
 927         if (drive->disk)
 928                 drive->disk->queue = drive->queue;
 929
 930         /* needs drive->queue to be set */
 931         ide_toggle_bounce(drive, 1);
 932
 933         /* enable led activity for disk drives only */
 934         if (drive->media == ide_disk && hwif->led_act)
 935                 blk_queue_activity_fn(q, hwif->led_act, drive);
 936
 937         return 0;
 938 }
 939
 940 /*
 941  * This routine sets up the irq for an ide interface, and creates a new
 942  * hwgroup for the irq/hwif if none was previously assigned.
 943  *
 944  * Much of the code is for correctly detecting/handling irq sharing
 945  * and irq serialization situations.  This is somewhat complex because
 946  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 947  *
 948  * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
 949  * interrupts completely disabled.  This can be bad for interrupt latency,
 950  * but anything else has led to problems on some machines.  We re-enable
 951  * interrupts as much as we can safely do in most places.
 952  */
 953 static int init_irq (ide_hwif_t *hwif)
 954 {
 955         unsigned int index;
 956         ide_hwgroup_t *hwgroup;
 957         ide_hwif_t *match = NULL;
 958
 959
 960         BUG_ON(in_interrupt());
 961         BUG_ON(irqs_disabled());
 962         down(&ide_cfg_sem);
 963         hwif->hwgroup = NULL;
 964 #if MAX_HWIFS > 1
 965         /*
 966          * Group up with any other hwifs that share our irq(s).
 967          */
 968         for (index = 0; index < MAX_HWIFS; index++) {
 969                 ide_hwif_t *h = &ide_hwifs[index];
 970                 if (h->hwgroup) {  /* scan only initialized hwif's */
 971                         if (hwif->irq == h->irq) {
 972                                 hwif->sharing_irq = h->sharing_irq = 1;
 973                                 if (hwif->chipset != ide_pci ||
 974                                     h->chipset != ide_pci) {
 975                                         save_match(hwif, h, &match);
 976                                 }
 977                         }
 978                         if (hwif->serialized) {
 979                                 if (hwif->mate && hwif->mate->irq == h->irq)
 980                                         save_match(hwif, h, &match);
 981                         }
 982                         if (h->serialized) {
 983                                 if (h->mate && hwif->irq == h->mate->irq)
 984                                         save_match(hwif, h, &match);
 985                         }
 986                 }
 987         }
 988 #endif /* MAX_HWIFS > 1 */
 989         /*
 990          * If we are still without a hwgroup, then form a new one
 991          */
 992         if (match) {
 993                 hwgroup = match->hwgroup;
 994                 hwif->hwgroup = hwgroup;
 995                 /*
 996                  * Link us into the hwgroup.
 997                  * This must be done early, do ensure that unexpected_intr
 998                  * can find the hwif and prevent irq storms.
 999                  * No drives are attached to the new hwif, choose_drive
1000                  * can't do anything stupid (yet).
1001                  * Add ourself as the 2nd entry to the hwgroup->hwif
1002                  * linked list, the first entry is the hwif that owns
1003                  * hwgroup->handler - do not change that.
1004                  */
1005                 spin_lock_irq(&ide_lock);
1006                 hwif->next = hwgroup->hwif->next;
1007                 hwgroup->hwif->next = hwif;
1008                 spin_unlock_irq(&ide_lock);
1009         } else {
1010                 hwgroup = kmalloc(sizeof(ide_hwgroup_t),GFP_KERNEL);
1011                 if (!hwgroup)
1012                         goto out_up;
1013
1014                 hwif->hwgroup = hwgroup;
1015
1016                 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1017                 hwgroup->hwif     = hwif->next = hwif;
1018                 hwgroup->rq       = NULL;
1019                 hwgroup->handler  = NULL;
1020                 hwgroup->drive    = NULL;
1021                 hwgroup->busy     = 0;
1022                 init_timer(&hwgroup->timer);
1023                 hwgroup->timer.function = &ide_timer_expiry;
1024                 hwgroup->timer.data = (unsigned long) hwgroup;
1025         }
1026
1027         /*
1028          * Allocate the irq, if not already obtained for another hwif
1029          */
1030         if (!match || match->irq != hwif->irq) {
1031                 int sa = SA_INTERRUPT;
1032 #if defined(__mc68000__) || defined(CONFIG_APUS)
1033                 sa = SA_SHIRQ;
1034 #endif /* __mc68000__ || CONFIG_APUS */
1035
1036                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1037                         sa = SA_SHIRQ;
1038 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1039                         sa |= SA_INTERRUPT;
1040 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1041                 }
1042
1043                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1044                         /* clear nIEN */
1045                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1046
1047                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1048                         goto out_unlink;
1049         }
1050
1051         /*
1052          * For any present drive:
1053          * - allocate the block device queue
1054          * - link drive into the hwgroup
1055          */
1056         for (index = 0; index < MAX_DRIVES; ++index) {
1057                 ide_drive_t *drive = &hwif->drives[index];
1058                 if (!drive->present)
1059                         continue;
1060                 if (ide_init_queue(drive)) {
1061                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1062                         continue;
1063                 }
1064                 spin_lock_irq(&ide_lock);
1065                 if (!hwgroup->drive) {
1066                         /* first drive for hwgroup. */
1067                         drive->next = drive;
1068                         hwgroup->drive = drive;
1069                         hwgroup->hwif = HWIF(hwgroup->drive);
1070                 } else {
1071                         drive->next = hwgroup->drive->next;
1072                         hwgroup->drive->next = drive;
1073                 }
1074                 spin_unlock_irq(&ide_lock);
1075         }
1076
1077 #if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
1078         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1079                 hwif->io_ports[IDE_DATA_OFFSET],
1080                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1081                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1082 #elif defined(__sparc__)
1083         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
1084                 hwif->io_ports[IDE_DATA_OFFSET],
1085                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1086                 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
1087 #else
1088         printk("%s at 0x%08lx on irq %d", hwif->name,
1089                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1090 #endif /* __mc68000__ && CONFIG_APUS */
1091         if (match)
1092                 printk(" (%sed with %s)",
1093                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1094         printk("\n");
1095         up(&ide_cfg_sem);
1096         return 0;
1097 out_unlink:
1098         spin_lock_irq(&ide_lock);
1099         if (hwif->next == hwif) {
1100                 BUG_ON(match);
1101                 BUG_ON(hwgroup->hwif != hwif);
1102                 kfree(hwgroup);
1103         } else {
1104                 ide_hwif_t *g;
1105                 g = hwgroup->hwif;
1106                 while (g->next != hwif)
1107                         g = g->next;
1108                 g->next = hwif->next;
1109                 if (hwgroup->hwif == hwif) {
1110                         /* Impossible. */
1111                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1112                         hwgroup->hwif = g;
1113                 }
1114                 BUG_ON(hwgroup->hwif == hwif);
1115         }
1116         spin_unlock_irq(&ide_lock);
1117 out_up:
1118         up(&ide_cfg_sem);
1119         return 1;
1120 }
1121
1122 static int ata_lock(dev_t dev, void *data)
1123 {
1124         /* FIXME: we want to pin hwif down */
1125         return 0;
1126 }
1127
1128 extern ide_driver_t idedefault_driver;
1129
1130 struct kobject *ata_probe(dev_t dev, int *part, void *data)
1131 {
1132         ide_hwif_t *hwif = data;
1133         int unit = *part >> PARTN_BITS;
1134         ide_drive_t *drive = &hwif->drives[unit];
1135         if (!drive->present)
1136                 return NULL;
1137         if (drive->driver == &idedefault_driver) {
1138                 if (drive->media == ide_disk)
1139                         (void) request_module("ide-disk");
1140                 if (drive->scsi)
1141                         (void) request_module("ide-scsi");
1142                 if (drive->media == ide_cdrom || drive->media == ide_optical)
1143                         (void) request_module("ide-cd");
1144                 if (drive->media == ide_tape)
1145                         (void) request_module("ide-tape");
1146                 if (drive->media == ide_floppy)
1147                         (void) request_module("ide-floppy");
1148         }
1149         if (drive->driver == &idedefault_driver)
1150                 return NULL;
1151         *part &= (1 << PARTN_BITS) - 1;
1152         return get_disk(drive->disk);
1153 }
1154
1155 static int alloc_disks(ide_hwif_t *hwif)
1156 {
1157         unsigned int unit;
1158         struct gendisk *disks[MAX_DRIVES];
1159
1160         for (unit = 0; unit < MAX_DRIVES; unit++) {
1161                 disks[unit] = alloc_disk(1 << PARTN_BITS);
1162                 if (!disks[unit])
1163                         goto Enomem;
1164         }
1165         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1166                 ide_drive_t *drive = &hwif->drives[unit];
1167                 struct gendisk *disk = disks[unit];
1168                 disk->major  = hwif->major;
1169                 disk->first_minor = unit << PARTN_BITS;
1170                 sprintf(disk->disk_name,"hd%c",'a'+hwif->index*MAX_DRIVES+unit);
1171                 disk->fops = ide_fops;
1172                 disk->private_data = drive;
1173                 drive->disk = disk;
1174         }
1175         return 0;
1176 Enomem:
1177         printk(KERN_WARNING "(ide::init_gendisk) Out of memory\n");
1178         while (unit--)
1179                 put_disk(disks[unit]);
1180         return -ENOMEM;
1181 }
1182
1183 static void drive_release_dev (struct device *dev)
1184 {
1185         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1186
1187         up(&drive->gendev_rel_sem);
1188 }
1189
1190 /*
1191  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1192  * after probing for drives, to allocate partition tables and other data
1193  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1194  * somewhat later, during the partition check.
1195  */
1196 static void init_gendisk (ide_hwif_t *hwif)
1197 {
1198         unsigned int unit;
1199
1200         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1201                 ide_drive_t * drive = &hwif->drives[unit];
1202                 ide_add_generic_settings(drive);
1203                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1204                          hwif->index,unit);
1205                 drive->gendev.parent = &hwif->gendev;
1206                 drive->gendev.bus = &ide_bus_type;
1207                 drive->gendev.driver_data = drive;
1208                 drive->gendev.release = drive_release_dev;
1209                 if (drive->present) {
1210                         device_register(&drive->gendev);
1211                         sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
1212                                 (hwif->channel && hwif->mate) ?
1213                                 hwif->mate->index : hwif->index,
1214                                 hwif->channel, unit, drive->lun);
1215                 }
1216         }
1217         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1218                         THIS_MODULE, ata_probe, ata_lock, hwif);
1219 }
1220
1221 static int hwif_init(ide_hwif_t *hwif)
1222 {
1223         int old_irq, unit;
1224
1225         if (!hwif->present)
1226                 return 0;
1227
1228         if (!hwif->irq) {
1229                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1230                 {
1231                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1232                         return (hwif->present = 0);
1233                 }
1234         }
1235 #ifdef CONFIG_BLK_DEV_HD
1236         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1237                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1238                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1239                 return (hwif->present = 0);
1240         }
1241 #endif /* CONFIG_BLK_DEV_HD */
1242
1243         /* we set it back to 1 if all is ok below */
1244         hwif->present = 0;
1245
1246         if (register_blkdev(hwif->major, hwif->name))
1247                 return 0;
1248
1249         if (alloc_disks(hwif) < 0)
1250                 goto out;
1251
1252         if (init_irq(hwif) == 0)
1253                 goto done;
1254
1255         old_irq = hwif->irq;
1256         /*
1257          *      It failed to initialise. Find the default IRQ for
1258          *      this port and try that.
1259          */
1260         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1261                 printk("%s: Disabled unable to get IRQ %d.\n",
1262                         hwif->name, old_irq);
1263                 goto out_disks;
1264         }
1265         if (init_irq(hwif)) {
1266                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1267                         hwif->name, old_irq, hwif->irq);
1268                 goto out_disks;
1269         }
1270         printk("%s: probed IRQ %d failed, using default.\n",
1271                 hwif->name, hwif->irq);
1272
1273 done:
1274         init_gendisk(hwif);
1275         hwif->present = 1;      /* success */
1276         return 1;
1277
1278 out_disks:
1279         for (unit = 0; unit < MAX_DRIVES; unit++) {
1280                 struct gendisk *disk = hwif->drives[unit].disk;
1281                 hwif->drives[unit].disk = NULL;
1282                 put_disk(disk);
1283         }
1284 out:
1285         unregister_blkdev(hwif->major, hwif->name);
1286         return 0;
1287 }
1288
1289 int ideprobe_init (void)
1290 {
1291         unsigned int index;
1292         int probe[MAX_HWIFS];
1293
1294         memset(probe, 0, MAX_HWIFS * sizeof(int));
1295         for (index = 0; index < MAX_HWIFS; ++index)
1296                 probe[index] = !ide_hwifs[index].present;
1297
1298         /*
1299          * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
1300          */
1301         for (index = 0; index < MAX_HWIFS; ++index)
1302                 if (probe[index])
1303                         probe_hwif(&ide_hwifs[index]);
1304         for (index = 0; index < MAX_HWIFS; ++index)
1305                 if (probe[index])
1306                         hwif_init(&ide_hwifs[index]);
1307         for (index = 0; index < MAX_HWIFS; ++index) {
1308                 if (probe[index]) {
1309                         ide_hwif_t *hwif = &ide_hwifs[index];
1310                         int unit;
1311                         if (!hwif->present)
1312                                 continue;
1313                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1314                                 hwif->chipset = ide_generic;
1315                         for (unit = 0; unit < MAX_DRIVES; ++unit)
1316                                 if (hwif->drives[unit].present)
1317                                         ata_attach(&hwif->drives[unit]);
1318                 }
1319         }
1320         return 0;
1321 }
1322
1323 EXPORT_SYMBOL_GPL(ideprobe_init);