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
 245         /* Initialize queue depth settings */
 246         drive->queue_depth = 1;
 247 #ifdef CONFIG_BLK_DEV_IDE_TCQ_DEPTH
 248         drive->queue_depth = CONFIG_BLK_DEV_IDE_TCQ_DEPTH;
 249 #else
 250         drive->queue_depth = drive->id->queue_depth + 1;
 251 #endif
 252         if (drive->queue_depth < 1 || drive->queue_depth > IDE_MAX_TAG)
 253                 drive->queue_depth = IDE_MAX_TAG;
 254
 255         return;
 256
 257 err_misc:
 258         kfree(id);
 259         drive->present = 0;
 260         return;
 261 }
 262
 263 /**
 264  *      actual_try_to_identify  -       send ata/atapi identify
 265  *      @drive: drive to identify
 266  *      @cmd: command to use
 267  *
 268  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 269  *      and waits for a response.  It also monitors irqs while this is
 270  *      happening, in hope of automatically determining which one is
 271  *      being used by the interface.
 272  *
 273  *      Returns:        0  device was identified
 274  *                      1  device timed-out (no response to identify request)
 275  *                      2  device aborted the command (refused to identify itself)
 276  */
 277
 278 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 279 {
 280         ide_hwif_t *hwif = HWIF(drive);
 281         int rc;
 282         unsigned long hd_status;
 283         unsigned long timeout;
 284         u8 s = 0, a = 0;
 285
 286         /* take a deep breath */
 287         msleep(50);
 288
 289         if (IDE_CONTROL_REG) {
 290                 a = hwif->INB(IDE_ALTSTATUS_REG);
 291                 s = hwif->INB(IDE_STATUS_REG);
 292                 if ((a ^ s) & ~INDEX_STAT) {
 293                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 294                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 295                         /* ancient Seagate drives, broken interfaces */
 296                         hd_status = IDE_STATUS_REG;
 297                 } else {
 298                         /* use non-intrusive polling */
 299                         hd_status = IDE_ALTSTATUS_REG;
 300                 }
 301         } else
 302                 hd_status = IDE_STATUS_REG;
 303
 304         /* set features register for atapi
 305          * identify command to be sure of reply
 306          */
 307         if ((cmd == WIN_PIDENTIFY))
 308                 /* disable dma & overlap */
 309                 hwif->OUTB(0, IDE_FEATURE_REG);
 310
 311         if (hwif->identify != NULL) {
 312                 if (hwif->identify(drive))
 313                         return 1;
 314         } else {
 315                 /* ask drive for ID */
 316                 hwif->OUTB(cmd, IDE_COMMAND_REG);
 317         }
 318         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 319         timeout += jiffies;
 320         do {
 321                 if (time_after(jiffies, timeout)) {
 322                         /* drive timed-out */
 323                         return 1;
 324                 }
 325                 /* give drive a breather */
 326                 msleep(50);
 327         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 328
 329         /* wait for IRQ and DRQ_STAT */
 330         msleep(50);
 331         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 332                 unsigned long flags;
 333
 334                 /* local CPU only; some systems need this */
 335                 local_irq_save(flags);
 336                 /* drive returned ID */
 337                 do_identify(drive, cmd);
 338                 /* drive responded with ID */
 339                 rc = 0;
 340                 /* clear drive IRQ */
 341                 (void) hwif->INB(IDE_STATUS_REG);
 342                 local_irq_restore(flags);
 343         } else {
 344                 /* drive refused ID */
 345                 rc = 2;
 346         }
 347         return rc;
 348 }
 349
 350 /**
 351  *      try_to_identify -       try to identify a drive
 352  *      @drive: drive to probe
 353  *      @cmd: command to use
 354  *
 355  *      Issue the identify command and then do IRQ probing to
 356  *      complete the identification when needed by finding the
 357  *      IRQ the drive is attached to
 358  */
 359
 360 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 361 {
 362         ide_hwif_t *hwif = HWIF(drive);
 363         int retval;
 364         int autoprobe = 0;
 365         unsigned long cookie = 0;
 366
 367         /*
 368          * Disable device irq unless we need to
 369          * probe for it. Otherwise we'll get spurious
 370          * interrupts during the identify-phase that
 371          * the irq handler isn't expecting.
 372          */
 373         if (IDE_CONTROL_REG) {
 374                 u8 ctl = drive->ctl | 2;
 375                 if (!hwif->irq) {
 376                         autoprobe = 1;
 377                         cookie = probe_irq_on();
 378                         /* enable device irq */
 379                         ctl &= ~2;
 380                 }
 381                 hwif->OUTB(ctl, IDE_CONTROL_REG);
 382         }
 383
 384         retval = actual_try_to_identify(drive, cmd);
 385
 386         if (autoprobe) {
 387                 int irq;
 388                 /* mask device irq */
 389                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 390                 /* clear drive IRQ */
 391                 (void) hwif->INB(IDE_STATUS_REG);
 392                 udelay(5);
 393                 irq = probe_irq_off(cookie);
 394                 if (!hwif->irq) {
 395                         if (irq > 0) {
 396                                 hwif->irq = irq;
 397                         } else {
 398                                 /* Mmmm.. multiple IRQs..
 399                                  * don't know which was ours
 400                                  */
 401                                 printk("%s: IRQ probe failed (0x%lx)\n",
 402                                         drive->name, cookie);
 403 #ifdef CONFIG_BLK_DEV_CMD640
 404 #ifdef CMD640_DUMP_REGS
 405                                 if (hwif->chipset == ide_cmd640) {
 406                                         printk("%s: Hmmm.. probably a driver "
 407                                                 "problem.\n", drive->name);
 408                                         CMD640_DUMP_REGS;
 409                                 }
 410 #endif /* CMD640_DUMP_REGS */
 411 #endif /* CONFIG_BLK_DEV_CMD640 */
 412                         }
 413                 }
 414         }
 415         return retval;
 416 }
 417
 418
 419 /**
 420  *      do_probe                -       probe an IDE device
 421  *      @drive: drive to probe
 422  *      @cmd: command to use
 423  *
 424  *      do_probe() has the difficult job of finding a drive if it exists,
 425  *      without getting hung up if it doesn't exist, without trampling on
 426  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 427  *
 428  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 429  *      but does not respond right away, the probe will "hang in there"
 430  *      for the maximum wait time (about 30 seconds), otherwise it will
 431  *      exit much more quickly.
 432  *
 433  * Returns:     0  device was identified
 434  *              1  device timed-out (no response to identify request)
 435  *              2  device aborted the command (refused to identify itself)
 436  *              3  bad status from device (possible for ATAPI drives)
 437  *              4  probe was not attempted because failure was obvious
 438  */
 439
 440 static int do_probe (ide_drive_t *drive, u8 cmd)
 441 {
 442         int rc;
 443         ide_hwif_t *hwif = HWIF(drive);
 444
 445         if (drive->present) {
 446                 /* avoid waiting for inappropriate probes */
 447                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 448                         return 4;
 449         }
 450 #ifdef DEBUG
 451         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 452                 drive->name, drive->present, drive->media,
 453                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 454 #endif
 455
 456         /* needed for some systems
 457          * (e.g. crw9624 as drive0 with disk as slave)
 458          */
 459         msleep(50);
 460         SELECT_DRIVE(drive);
 461         msleep(50);
 462         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 463                 if (drive->select.b.unit != 0) {
 464                         /* exit with drive0 selected */
 465                         SELECT_DRIVE(&hwif->drives[0]);
 466                         /* allow BUSY_STAT to assert & clear */
 467                         msleep(50);
 468                 }
 469                 /* no i/f present: mmm.. this should be a 4 -ml */
 470                 return 3;
 471         }
 472
 473         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 474             drive->present || cmd == WIN_PIDENTIFY) {
 475                 /* send cmd and wait */
 476                 if ((rc = try_to_identify(drive, cmd))) {
 477                         /* failed: try again */
 478                         rc = try_to_identify(drive,cmd);
 479                 }
 480                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 481                         return 4;
 482
 483                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 484                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 485                         (drive->autotune == IDE_TUNE_AUTO))) {
 486                         unsigned long timeout;
 487                         printk("%s: no response (status = 0x%02x), "
 488                                 "resetting drive\n", drive->name,
 489                                 hwif->INB(IDE_STATUS_REG));
 490                         msleep(50);
 491                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 492                         msleep(50);
 493                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 494                         timeout = jiffies;
 495                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
 496                                time_before(jiffies, timeout + WAIT_WORSTCASE))
 497                                 msleep(50);
 498                         rc = try_to_identify(drive, cmd);
 499                 }
 500                 if (rc == 1)
 501                         printk("%s: no response (status = 0x%02x)\n",
 502                                 drive->name, hwif->INB(IDE_STATUS_REG));
 503                 /* ensure drive irq is clear */
 504                 (void) hwif->INB(IDE_STATUS_REG);
 505         } else {
 506                 /* not present or maybe ATAPI */
 507                 rc = 3;
 508         }
 509         if (drive->select.b.unit != 0) {
 510                 /* exit with drive0 selected */
 511                 SELECT_DRIVE(&hwif->drives[0]);
 512                 msleep(50);
 513                 /* ensure drive irq is clear */
 514                 (void) hwif->INB(IDE_STATUS_REG);
 515         }
 516         return rc;
 517 }
 518
 519 /*
 520  *
 521  */
 522 static void enable_nest (ide_drive_t *drive)
 523 {
 524         ide_hwif_t *hwif = HWIF(drive);
 525         unsigned long timeout;
 526
 527         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 528         SELECT_DRIVE(drive);
 529         msleep(50);
 530         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 531         timeout = jiffies + WAIT_WORSTCASE;
 532         do {
 533                 if (time_after(jiffies, timeout)) {
 534                         printk("failed (timeout)\n");
 535                         return;
 536                 }
 537                 msleep(50);
 538         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 539
 540         msleep(50);
 541
 542         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 543                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 544         } else {
 545                 printk("success\n");
 546         }
 547
 548         /* if !(success||timed-out) */
 549         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 550                 /* look for ATAPI device */
 551                 (void) do_probe(drive, WIN_PIDENTIFY);
 552         }
 553 }
 554
 555 /**
 556  *      probe_for_drives        -       upper level drive probe
 557  *      @drive: drive to probe for
 558  *
 559  *      probe_for_drive() tests for existence of a given drive using do_probe()
 560  *      and presents things to the user as needed.
 561  *
 562  *      Returns:        0  no device was found
 563  *                      1  device was found (note: drive->present might
 564  *                         still be 0)
 565  */
 566
 567 static inline u8 probe_for_drive (ide_drive_t *drive)
 568 {
 569         /*
 570          *      In order to keep things simple we have an id
 571          *      block for all drives at all times. If the device
 572          *      is pre ATA or refuses ATA/ATAPI identify we
 573          *      will add faked data to this.
 574          *
 575          *      Also note that 0 everywhere means "can't do X"
 576          */
 577
 578         drive->id = kmalloc(SECTOR_WORDS *4, GFP_KERNEL);
 579         drive->id_read = 0;
 580         if(drive->id == NULL)
 581         {
 582                 printk(KERN_ERR "ide: out of memory for id data.\n");
 583                 return 0;
 584         }
 585         memset(drive->id, 0, SECTOR_WORDS * 4);
 586         strcpy(drive->id->model, "UNKNOWN");
 587
 588         /* skip probing? */
 589         if (!drive->noprobe)
 590         {
 591                 /* if !(success||timed-out) */
 592                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 593                         /* look for ATAPI device */
 594                         (void) do_probe(drive, WIN_PIDENTIFY);
 595                 }
 596                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 597                         enable_nest(drive);
 598                 if (!drive->present)
 599                         /* drive not found */
 600                         return 0;
 601
 602                 /* identification failed? */
 603                 if (!drive->id_read) {
 604                         if (drive->media == ide_disk) {
 605                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 606                                         drive->name, drive->cyl,
 607                                         drive->head, drive->sect);
 608                         } else if (drive->media == ide_cdrom) {
 609                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 610                         } else {
 611                                 /* nuke it */
 612                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 613                                 drive->present = 0;
 614                         }
 615                 }
 616                 /* drive was found */
 617         }
 618         if(!drive->present)
 619                 return 0;
 620         /* The drive wasn't being helpful. Add generic info only */
 621         if(!drive->id_read)
 622                 generic_id(drive);
 623         return drive->present;
 624 }
 625
 626 static void hwif_release_dev (struct device *dev)
 627 {
 628         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 629
 630         up(&hwif->gendev_rel_sem);
 631 }
 632
 633 static void hwif_register (ide_hwif_t *hwif)
 634 {
 635         /* register with global device tree */
 636         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 637         hwif->gendev.driver_data = hwif;
 638         if (hwif->gendev.parent == NULL) {
 639                 if (hwif->pci_dev)
 640                         hwif->gendev.parent = &hwif->pci_dev->dev;
 641                 else
 642                         /* Would like to do = &device_legacy */
 643                         hwif->gendev.parent = NULL;
 644         }
 645         hwif->gendev.release = hwif_release_dev;
 646         device_register(&hwif->gendev);
 647 }
 648
 649 //EXPORT_SYMBOL(hwif_register);
 650
 651 #ifdef CONFIG_PPC
 652 static int wait_hwif_ready(ide_hwif_t *hwif)
 653 {
 654         int rc;
 655
 656         printk(KERN_INFO "Probing IDE interface %s...\n", hwif->name);
 657
 658         /* Let HW settle down a bit from whatever init state we
 659          * come from */
 660         mdelay(2);
 661
 662         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 663          * I know of at least one disk who takes 31 seconds, I use 35
 664          * here to be safe
 665          */
 666         rc = ide_wait_not_busy(hwif, 35000);
 667         if (rc)
 668                 return rc;
 669
 670         /* Now make sure both master & slave are ready */
 671         SELECT_DRIVE(&hwif->drives[0]);
 672         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 673         mdelay(2);
 674         rc = ide_wait_not_busy(hwif, 10000);
 675         if (rc)
 676                 return rc;
 677         SELECT_DRIVE(&hwif->drives[1]);
 678         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 679         mdelay(2);
 680         rc = ide_wait_not_busy(hwif, 10000);
 681
 682         /* Exit function with master reselected (let's be sane) */
 683         SELECT_DRIVE(&hwif->drives[0]);
 684
 685         return rc;
 686 }
 687 #endif
 688
 689 /*
 690  * This routine only knows how to look for drive units 0 and 1
 691  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 692  */
 693 void probe_hwif (ide_hwif_t *hwif)
 694 {
 695         unsigned int unit;
 696         unsigned long flags;
 697         unsigned int irqd;
 698
 699         if (hwif->noprobe)
 700                 return;
 701
 702         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 703 #ifdef CONFIG_BLK_DEV_PDC4030
 704             (hwif->chipset != ide_pdc4030 || hwif->channel == 0) &&
 705 #endif /* CONFIG_BLK_DEV_PDC4030 */
 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 #ifdef CONFIG_PPC
 734         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 735          * platforms. Typical cases are:
 736          *
 737          *  - The firmware hard reset the disk before booting the kernel,
 738          *    the drive is still doing it's poweron-reset sequence, that
 739          *    can take up to 30 seconds
 740          *  - The firmware does nothing (or no firmware), the device is
 741          *    still in POST state (same as above actually).
 742          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 743          *    their reset sequence even when they are non-selected slave
 744          *    devices, thus preventing discovery of the main HD
 745          *
 746          *  Doing this wait-for-busy should not harm any existing configuration
 747          *  (at least things won't be worse than what current code does, that
 748          *  is blindly go & talk to the drive) and fix some issues like the
 749          *  above.
 750          *
 751          *  BenH.
 752          */
 753         if (wait_hwif_ready(hwif))
 754                 printk(KERN_WARNING "%s: Wait for ready failed before probe !\n", hwif->name);
 755 #endif /* CONFIG_PPC */
 756
 757         /*
 758          * Second drive should only exist if first drive was found,
 759          * but a lot of cdrom drives are configured as single slaves.
 760          */
 761         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 762                 ide_drive_t *drive = &hwif->drives[unit];
 763                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 764                 (void) probe_for_drive(drive);
 765                 if (drive->present && !hwif->present) {
 766                         hwif->present = 1;
 767                         if (hwif->chipset != ide_4drives ||
 768                             !hwif->mate ||
 769                             !hwif->mate->present) {
 770                                 hwif_register(hwif);
 771                         }
 772                 }
 773         }
 774         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 775                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 776                 u8 stat;
 777
 778                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 779                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 780                 udelay(10);
 781                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 782                 do {
 783                         msleep(50);
 784                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 785                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 786
 787         }
 788         local_irq_restore(flags);
 789         /*
 790          * Use cached IRQ number. It might be (and is...) changed by probe
 791          * code above
 792          */
 793         if (irqd)
 794                 enable_irq(irqd);
 795
 796         if (!hwif->present) {
 797                 ide_hwif_release_regions(hwif);
 798                 return;
 799         }
 800
 801         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 802                 ide_drive_t *drive = &hwif->drives[unit];
 803
 804                 if (drive->present) {
 805                         if (hwif->tuneproc != NULL &&
 806                                 drive->autotune == IDE_TUNE_AUTO)
 807                                 /* auto-tune PIO mode */
 808                                 hwif->tuneproc(drive, 255);
 809                         /*
 810                          * MAJOR HACK BARF :-/
 811                          *
 812                          * FIXME: chipsets own this cruft!
 813                          */
 814                         /*
 815                          * Move here to prevent module loading clashing.
 816                          */
 817         //              drive->autodma = hwif->autodma;
 818                         if ((hwif->ide_dma_check) &&
 819                                 ((drive->autotune == IDE_TUNE_DEFAULT) ||
 820                                 (drive->autotune == IDE_TUNE_AUTO))) {
 821                                 /*
 822                                  * Force DMAing for the beginning of the check.
 823                                  * Some chipsets appear to do interesting
 824                                  * things, if not checked and cleared.
 825                                  *   PARANOIA!!!
 826                                  */
 827                                 hwif->ide_dma_off_quietly(drive);
 828 #ifdef CONFIG_IDEDMA_ONLYDISK
 829                                 if (drive->media == ide_disk)
 830 #endif
 831                                         hwif->ide_dma_check(drive);
 832                         }
 833                 }
 834         }
 835 }
 836
 837 EXPORT_SYMBOL(probe_hwif);
 838
 839 int hwif_init (ide_hwif_t *hwif);
 840 int probe_hwif_init (ide_hwif_t *hwif)
 841 {
 842         probe_hwif(hwif);
 843         hwif_init(hwif);
 844
 845         if (hwif->present) {
 846                 u16 unit = 0;
 847                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 848                         ide_drive_t *drive = &hwif->drives[unit];
 849                         /* For now don't attach absent drives, we may
 850                            want them on default or a new "empty" class
 851                            for hotplug reprobing ? */
 852                         if (drive->present) {
 853                                 ata_attach(drive);
 854                         }
 855                 }
 856         }
 857         return 0;
 858 }
 859
 860 EXPORT_SYMBOL(probe_hwif_init);
 861
 862 #if MAX_HWIFS > 1
 863 /*
 864  * save_match() is used to simplify logic in init_irq() below.
 865  *
 866  * A loophole here is that we may not know about a particular
 867  * hwif's irq until after that hwif is actually probed/initialized..
 868  * This could be a problem for the case where an hwif is on a
 869  * dual interface that requires serialization (eg. cmd640) and another
 870  * hwif using one of the same irqs is initialized beforehand.
 871  *
 872  * This routine detects and reports such situations, but does not fix them.
 873  */
 874 void save_match (ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 875 {
 876         ide_hwif_t *m = *match;
 877
 878         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 879                 if (!new->hwgroup)
 880                         return;
 881                 printk("%s: potential irq problem with %s and %s\n",
 882                         hwif->name, new->name, m->name);
 883         }
 884         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 885                 *match = new;
 886 }
 887 EXPORT_SYMBOL(save_match);
 888 #endif /* MAX_HWIFS > 1 */
 889
 890 /*
 891  * init request queue
 892  */
 893 static int ide_init_queue(ide_drive_t *drive)
 894 {
 895         request_queue_t *q;
 896         ide_hwif_t *hwif = HWIF(drive);
 897         int max_sectors = 256;
 898         int max_sg_entries = PRD_ENTRIES;
 899
 900         /*
 901          *      Our default set up assumes the normal IDE case,
 902          *      that is 64K segmenting, standard PRD setup
 903          *      and LBA28. Some drivers then impose their own
 904          *      limits and LBA48 we could raise it but as yet
 905          *      do not.
 906          */
 907
 908         q = blk_init_queue(do_ide_request, &ide_lock);
 909         if (!q)
 910                 return 1;
 911
 912         q->queuedata = HWGROUP(drive);
 913         blk_queue_segment_boundary(q, 0xffff);
 914
 915         if (!hwif->rqsize)
 916                 hwif->rqsize = hwif->no_lba48 ? 256 : 65536;
 917         if (hwif->rqsize < max_sectors)
 918                 max_sectors = hwif->rqsize;
 919         blk_queue_max_sectors(q, max_sectors);
 920
 921 #ifdef CONFIG_PCI
 922         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 923          * creates segments that don't completely match our boundary
 924          * requirements and thus need to be broken up again. Because it
 925          * doesn't align properly neither, we may actually have to break up
 926          * to more segments than what was we got in the first place, a max
 927          * worst case is twice as many.
 928          * This will be fixed once we teach pci_map_sg() about our boundary
 929          * requirements, hopefully soon
 930          */
 931         if (!PCI_DMA_BUS_IS_PHYS)
 932                 max_sg_entries >>= 1;
 933 #endif /* CONFIG_PCI */
 934
 935         blk_queue_max_hw_segments(q, max_sg_entries);
 936         blk_queue_max_phys_segments(q, max_sg_entries);
 937
 938         /* assign drive and gendisk queue */
 939         drive->queue = q;
 940         if (drive->disk)
 941                 drive->disk->queue = drive->queue;
 942
 943         /* needs drive->queue to be set */
 944         ide_toggle_bounce(drive, 1);
 945
 946         /* enable led activity for disk drives only */
 947         if (drive->media == ide_disk && hwif->led_act)
 948                 blk_queue_activity_fn(q, hwif->led_act, drive);
 949
 950         return 0;
 951 }
 952
 953 /*
 954  * This routine sets up the irq for an ide interface, and creates a new
 955  * hwgroup for the irq/hwif if none was previously assigned.
 956  *
 957  * Much of the code is for correctly detecting/handling irq sharing
 958  * and irq serialization situations.  This is somewhat complex because
 959  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 960  *
 961  * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
 962  * interrupts completely disabled.  This can be bad for interrupt latency,
 963  * but anything else has led to problems on some machines.  We re-enable
 964  * interrupts as much as we can safely do in most places.
 965  */
 966 static int init_irq (ide_hwif_t *hwif)
 967 {
 968         unsigned int index;
 969         ide_hwgroup_t *hwgroup;
 970         ide_hwif_t *match = NULL;
 971
 972
 973         BUG_ON(in_interrupt());
 974         BUG_ON(irqs_disabled());
 975         down(&ide_cfg_sem);
 976         hwif->hwgroup = NULL;
 977 #if MAX_HWIFS > 1
 978         /*
 979          * Group up with any other hwifs that share our irq(s).
 980          */
 981         for (index = 0; index < MAX_HWIFS; index++) {
 982                 ide_hwif_t *h = &ide_hwifs[index];
 983                 if (h->hwgroup) {  /* scan only initialized hwif's */
 984                         if (hwif->irq == h->irq) {
 985                                 hwif->sharing_irq = h->sharing_irq = 1;
 986                                 if (hwif->chipset != ide_pci ||
 987                                     h->chipset != ide_pci) {
 988                                         save_match(hwif, h, &match);
 989                                 }
 990                         }
 991                         if (hwif->serialized) {
 992                                 if (hwif->mate && hwif->mate->irq == h->irq)
 993                                         save_match(hwif, h, &match);
 994                         }
 995                         if (h->serialized) {
 996                                 if (h->mate && hwif->irq == h->mate->irq)
 997                                         save_match(hwif, h, &match);
 998                         }
 999                 }
1000         }
1001 #endif /* MAX_HWIFS > 1 */
1002         /*
1003          * If we are still without a hwgroup, then form a new one
1004          */
1005         if (match) {
1006                 hwgroup = match->hwgroup;
1007                 hwif->hwgroup = hwgroup;
1008                 /*
1009                  * Link us into the hwgroup.
1010                  * This must be done early, do ensure that unexpected_intr
1011                  * can find the hwif and prevent irq storms.
1012                  * No drives are attached to the new hwif, choose_drive
1013                  * can't do anything stupid (yet).
1014                  * Add ourself as the 2nd entry to the hwgroup->hwif
1015                  * linked list, the first entry is the hwif that owns
1016                  * hwgroup->handler - do not change that.
1017                  */
1018                 spin_lock_irq(&ide_lock);
1019                 hwif->next = hwgroup->hwif->next;
1020                 hwgroup->hwif->next = hwif;
1021                 spin_unlock_irq(&ide_lock);
1022         } else {
1023                 hwgroup = kmalloc(sizeof(ide_hwgroup_t),GFP_KERNEL);
1024                 if (!hwgroup)
1025                         goto out_up;
1026
1027                 hwif->hwgroup = hwgroup;
1028
1029                 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1030                 hwgroup->hwif     = hwif->next = hwif;
1031                 hwgroup->rq       = NULL;
1032                 hwgroup->handler  = NULL;
1033                 hwgroup->drive    = NULL;
1034                 hwgroup->busy     = 0;
1035                 init_timer(&hwgroup->timer);
1036                 hwgroup->timer.function = &ide_timer_expiry;
1037                 hwgroup->timer.data = (unsigned long) hwgroup;
1038         }
1039
1040         /*
1041          * Allocate the irq, if not already obtained for another hwif
1042          */
1043         if (!match || match->irq != hwif->irq) {
1044                 int sa = SA_INTERRUPT;
1045 #if defined(__mc68000__) || defined(CONFIG_APUS)
1046                 sa = SA_SHIRQ;
1047 #endif /* __mc68000__ || CONFIG_APUS */
1048
1049                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1050                         sa = SA_SHIRQ;
1051 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1052                         sa |= SA_INTERRUPT;
1053 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1054                 }
1055
1056                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1057                         /* clear nIEN */
1058                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1059
1060                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1061                         goto out_unlink;
1062         }
1063
1064         /*
1065          * For any present drive:
1066          * - allocate the block device queue
1067          * - link drive into the hwgroup
1068          */
1069         for (index = 0; index < MAX_DRIVES; ++index) {
1070                 ide_drive_t *drive = &hwif->drives[index];
1071                 if (!drive->present)
1072                         continue;
1073                 if (ide_init_queue(drive)) {
1074                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1075                         continue;
1076                 }
1077                 spin_lock_irq(&ide_lock);
1078                 if (!hwgroup->drive) {
1079                         /* first drive for hwgroup. */
1080                         drive->next = drive;
1081                         hwgroup->drive = drive;
1082                         hwgroup->hwif = HWIF(hwgroup->drive);
1083                 } else {
1084                         drive->next = hwgroup->drive->next;
1085                         hwgroup->drive->next = drive;
1086                 }
1087                 spin_unlock_irq(&ide_lock);
1088         }
1089
1090 #if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
1091         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1092                 hwif->io_ports[IDE_DATA_OFFSET],
1093                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1094                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1095 #elif defined(__sparc__)
1096         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
1097                 hwif->io_ports[IDE_DATA_OFFSET],
1098                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1099                 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
1100 #else
1101         printk("%s at 0x%08lx on irq %d", hwif->name,
1102                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1103 #endif /* __mc68000__ && CONFIG_APUS */
1104         if (match)
1105                 printk(" (%sed with %s)",
1106                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1107         printk("\n");
1108         up(&ide_cfg_sem);
1109         return 0;
1110 out_unlink:
1111         spin_lock_irq(&ide_lock);
1112         if (hwif->next == hwif) {
1113                 BUG_ON(match);
1114                 BUG_ON(hwgroup->hwif != hwif);
1115                 kfree(hwgroup);
1116         } else {
1117                 ide_hwif_t *g;
1118                 g = hwgroup->hwif;
1119                 while (g->next != hwif)
1120                         g = g->next;
1121                 g->next = hwif->next;
1122                 if (hwgroup->hwif == hwif) {
1123                         /* Impossible. */
1124                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1125                         hwgroup->hwif = g;
1126                 }
1127                 BUG_ON(hwgroup->hwif == hwif);
1128         }
1129         spin_unlock_irq(&ide_lock);
1130 out_up:
1131         up(&ide_cfg_sem);
1132         return 1;
1133 }
1134
1135 static int ata_lock(dev_t dev, void *data)
1136 {
1137         /* FIXME: we want to pin hwif down */
1138         return 0;
1139 }
1140
1141 extern ide_driver_t idedefault_driver;
1142
1143 struct kobject *ata_probe(dev_t dev, int *part, void *data)
1144 {
1145         ide_hwif_t *hwif = data;
1146         int unit = *part >> PARTN_BITS;
1147         ide_drive_t *drive = &hwif->drives[unit];
1148         if (!drive->present)
1149                 return NULL;
1150         if (drive->driver == &idedefault_driver) {
1151                 if (drive->media == ide_disk)
1152                         (void) request_module("ide-disk");
1153                 if (drive->scsi)
1154                         (void) request_module("ide-scsi");
1155                 if (drive->media == ide_cdrom || drive->media == ide_optical)
1156                         (void) request_module("ide-cd");
1157                 if (drive->media == ide_tape)
1158                         (void) request_module("ide-tape");
1159                 if (drive->media == ide_floppy)
1160                         (void) request_module("ide-floppy");
1161         }
1162         if (drive->driver == &idedefault_driver)
1163                 return NULL;
1164         *part &= (1 << PARTN_BITS) - 1;
1165         return get_disk(drive->disk);
1166 }
1167
1168 static int alloc_disks(ide_hwif_t *hwif)
1169 {
1170         unsigned int unit;
1171         struct gendisk *disks[MAX_DRIVES];
1172
1173         for (unit = 0; unit < MAX_DRIVES; unit++) {
1174                 disks[unit] = alloc_disk(1 << PARTN_BITS);
1175                 if (!disks[unit])
1176                         goto Enomem;
1177         }
1178         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1179                 ide_drive_t *drive = &hwif->drives[unit];
1180                 struct gendisk *disk = disks[unit];
1181                 disk->major  = hwif->major;
1182                 disk->first_minor = unit << PARTN_BITS;
1183                 sprintf(disk->disk_name,"hd%c",'a'+hwif->index*MAX_DRIVES+unit);
1184                 disk->fops = ide_fops;
1185                 disk->private_data = drive;
1186                 drive->disk = disk;
1187         }
1188         return 0;
1189 Enomem:
1190         printk(KERN_WARNING "(ide::init_gendisk) Out of memory\n");
1191         while (unit--)
1192                 put_disk(disks[unit]);
1193         return -ENOMEM;
1194 }
1195
1196 static void drive_release_dev (struct device *dev)
1197 {
1198         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1199
1200         up(&drive->gendev_rel_sem);
1201 }
1202
1203 /*
1204  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1205  * after probing for drives, to allocate partition tables and other data
1206  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1207  * somewhat later, during the partition check.
1208  */
1209 static void init_gendisk (ide_hwif_t *hwif)
1210 {
1211         unsigned int unit;
1212
1213         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1214                 ide_drive_t * drive = &hwif->drives[unit];
1215                 ide_add_generic_settings(drive);
1216                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1217                          hwif->index,unit);
1218                 drive->gendev.parent = &hwif->gendev;
1219                 drive->gendev.bus = &ide_bus_type;
1220                 drive->gendev.driver_data = drive;
1221                 drive->gendev.release = drive_release_dev;
1222                 if (drive->present) {
1223                         device_register(&drive->gendev);
1224                         sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
1225                                 (hwif->channel && hwif->mate) ?
1226                                 hwif->mate->index : hwif->index,
1227                                 hwif->channel, unit, drive->lun);
1228                 }
1229         }
1230         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1231                         THIS_MODULE, ata_probe, ata_lock, hwif);
1232 }
1233
1234 EXPORT_SYMBOL(init_gendisk);
1235
1236 int hwif_init (ide_hwif_t *hwif)
1237 {
1238         int old_irq, unit;
1239
1240         if (!hwif->present)
1241                 return 0;
1242
1243         if (!hwif->irq) {
1244                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1245                 {
1246                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1247                         return (hwif->present = 0);
1248                 }
1249         }
1250 #ifdef CONFIG_BLK_DEV_HD
1251         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1252                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1253                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1254                 return (hwif->present = 0);
1255         }
1256 #endif /* CONFIG_BLK_DEV_HD */
1257
1258         /* we set it back to 1 if all is ok below */
1259         hwif->present = 0;
1260
1261         if (register_blkdev(hwif->major, hwif->name))
1262                 return 0;
1263
1264         if (alloc_disks(hwif) < 0)
1265                 goto out;
1266
1267         if (init_irq(hwif) == 0)
1268                 goto done;
1269
1270         old_irq = hwif->irq;
1271         /*
1272          *      It failed to initialise. Find the default IRQ for
1273          *      this port and try that.
1274          */
1275         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1276                 printk("%s: Disabled unable to get IRQ %d.\n",
1277                         hwif->name, old_irq);
1278                 goto out_disks;
1279         }
1280         if (init_irq(hwif)) {
1281                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1282                         hwif->name, old_irq, hwif->irq);
1283                 goto out_disks;
1284         }
1285         printk("%s: probed IRQ %d failed, using default.\n",
1286                 hwif->name, hwif->irq);
1287
1288 done:
1289         init_gendisk(hwif);
1290         hwif->present = 1;      /* success */
1291         return 1;
1292
1293 out_disks:
1294         for (unit = 0; unit < MAX_DRIVES; unit++) {
1295                 struct gendisk *disk = hwif->drives[unit].disk;
1296                 hwif->drives[unit].disk = NULL;
1297                 put_disk(disk);
1298         }
1299 out:
1300         unregister_blkdev(hwif->major, hwif->name);
1301         return 0;
1302 }
1303
1304 EXPORT_SYMBOL(hwif_init);
1305
1306 int ideprobe_init (void)
1307 {
1308         unsigned int index;
1309         int probe[MAX_HWIFS];
1310
1311         memset(probe, 0, MAX_HWIFS * sizeof(int));
1312         for (index = 0; index < MAX_HWIFS; ++index)
1313                 probe[index] = !ide_hwifs[index].present;
1314
1315         /*
1316          * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
1317          */
1318         for (index = 0; index < MAX_HWIFS; ++index)
1319                 if (probe[index])
1320                         probe_hwif(&ide_hwifs[index]);
1321         for (index = 0; index < MAX_HWIFS; ++index)
1322                 if (probe[index])
1323                         hwif_init(&ide_hwifs[index]);
1324         for (index = 0; index < MAX_HWIFS; ++index) {
1325                 if (probe[index]) {
1326                         ide_hwif_t *hwif = &ide_hwifs[index];
1327                         int unit;
1328                         if (!hwif->present)
1329                                 continue;
1330                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1331                                 hwif->chipset = ide_generic;
1332                         for (unit = 0; unit < MAX_DRIVES; ++unit)
1333                                 if (hwif->drives[unit].present)
1334                                         ata_attach(&hwif->drives[unit]);
1335                 }
1336         }
1337         return 0;
1338 }
1339
1340 EXPORT_SYMBOL_GPL(ideprobe_init);