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 #ifdef CONFIG_BLK_DEV_CMD640
 393 #ifdef CMD640_DUMP_REGS
 394                                 if (hwif->chipset == ide_cmd640) {
 395                                         printk("%s: Hmmm.. probably a driver "
 396                                                 "problem.\n", drive->name);
 397                                         CMD640_DUMP_REGS;
 398                                 }
 399 #endif /* CMD640_DUMP_REGS */
 400 #endif /* CONFIG_BLK_DEV_CMD640 */
 401                         }
 402                 }
 403         }
 404         return retval;
 405 }
 406
 407
 408 /**
 409  *      do_probe                -       probe an IDE device
 410  *      @drive: drive to probe
 411  *      @cmd: command to use
 412  *
 413  *      do_probe() has the difficult job of finding a drive if it exists,
 414  *      without getting hung up if it doesn't exist, without trampling on
 415  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 416  *
 417  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 418  *      but does not respond right away, the probe will "hang in there"
 419  *      for the maximum wait time (about 30 seconds), otherwise it will
 420  *      exit much more quickly.
 421  *
 422  * Returns:     0  device was identified
 423  *              1  device timed-out (no response to identify request)
 424  *              2  device aborted the command (refused to identify itself)
 425  *              3  bad status from device (possible for ATAPI drives)
 426  *              4  probe was not attempted because failure was obvious
 427  */
 428
 429 static int do_probe (ide_drive_t *drive, u8 cmd)
 430 {
 431         int rc;
 432         ide_hwif_t *hwif = HWIF(drive);
 433
 434         if (drive->present) {
 435                 /* avoid waiting for inappropriate probes */
 436                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 437                         return 4;
 438         }
 439 #ifdef DEBUG
 440         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 441                 drive->name, drive->present, drive->media,
 442                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 443 #endif
 444
 445         /* needed for some systems
 446          * (e.g. crw9624 as drive0 with disk as slave)
 447          */
 448         msleep(50);
 449         SELECT_DRIVE(drive);
 450         msleep(50);
 451         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 452                 if (drive->select.b.unit != 0) {
 453                         /* exit with drive0 selected */
 454                         SELECT_DRIVE(&hwif->drives[0]);
 455                         /* allow BUSY_STAT to assert & clear */
 456                         msleep(50);
 457                 }
 458                 /* no i/f present: mmm.. this should be a 4 -ml */
 459                 return 3;
 460         }
 461
 462         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 463             drive->present || cmd == WIN_PIDENTIFY) {
 464                 /* send cmd and wait */
 465                 if ((rc = try_to_identify(drive, cmd))) {
 466                         /* failed: try again */
 467                         rc = try_to_identify(drive,cmd);
 468                 }
 469                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 470                         return 4;
 471
 472                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 473                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 474                         (drive->autotune == IDE_TUNE_AUTO))) {
 475                         unsigned long timeout;
 476                         printk("%s: no response (status = 0x%02x), "
 477                                 "resetting drive\n", drive->name,
 478                                 hwif->INB(IDE_STATUS_REG));
 479                         msleep(50);
 480                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 481                         msleep(50);
 482                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 483                         timeout = jiffies;
 484                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
 485                                time_before(jiffies, timeout + WAIT_WORSTCASE))
 486                                 msleep(50);
 487                         rc = try_to_identify(drive, cmd);
 488                 }
 489                 if (rc == 1)
 490                         printk("%s: no response (status = 0x%02x)\n",
 491                                 drive->name, hwif->INB(IDE_STATUS_REG));
 492                 /* ensure drive irq is clear */
 493                 (void) hwif->INB(IDE_STATUS_REG);
 494         } else {
 495                 /* not present or maybe ATAPI */
 496                 rc = 3;
 497         }
 498         if (drive->select.b.unit != 0) {
 499                 /* exit with drive0 selected */
 500                 SELECT_DRIVE(&hwif->drives[0]);
 501                 msleep(50);
 502                 /* ensure drive irq is clear */
 503                 (void) hwif->INB(IDE_STATUS_REG);
 504         }
 505         return rc;
 506 }
 507
 508 /*
 509  *
 510  */
 511 static void enable_nest (ide_drive_t *drive)
 512 {
 513         ide_hwif_t *hwif = HWIF(drive);
 514         unsigned long timeout;
 515
 516         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 517         SELECT_DRIVE(drive);
 518         msleep(50);
 519         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 520         timeout = jiffies + WAIT_WORSTCASE;
 521         do {
 522                 if (time_after(jiffies, timeout)) {
 523                         printk("failed (timeout)\n");
 524                         return;
 525                 }
 526                 msleep(50);
 527         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 528
 529         msleep(50);
 530
 531         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 532                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 533         } else {
 534                 printk("success\n");
 535         }
 536
 537         /* if !(success||timed-out) */
 538         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 539                 /* look for ATAPI device */
 540                 (void) do_probe(drive, WIN_PIDENTIFY);
 541         }
 542 }
 543
 544 /**
 545  *      probe_for_drives        -       upper level drive probe
 546  *      @drive: drive to probe for
 547  *
 548  *      probe_for_drive() tests for existence of a given drive using do_probe()
 549  *      and presents things to the user as needed.
 550  *
 551  *      Returns:        0  no device was found
 552  *                      1  device was found (note: drive->present might
 553  *                         still be 0)
 554  */
 555
 556 static inline u8 probe_for_drive (ide_drive_t *drive)
 557 {
 558         /*
 559          *      In order to keep things simple we have an id
 560          *      block for all drives at all times. If the device
 561          *      is pre ATA or refuses ATA/ATAPI identify we
 562          *      will add faked data to this.
 563          *
 564          *      Also note that 0 everywhere means "can't do X"
 565          */
 566
 567         drive->id = kmalloc(SECTOR_WORDS *4, GFP_KERNEL);
 568         drive->id_read = 0;
 569         if(drive->id == NULL)
 570         {
 571                 printk(KERN_ERR "ide: out of memory for id data.\n");
 572                 return 0;
 573         }
 574         memset(drive->id, 0, SECTOR_WORDS * 4);
 575         strcpy(drive->id->model, "UNKNOWN");
 576
 577         /* skip probing? */
 578         if (!drive->noprobe)
 579         {
 580                 /* if !(success||timed-out) */
 581                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 582                         /* look for ATAPI device */
 583                         (void) do_probe(drive, WIN_PIDENTIFY);
 584                 }
 585                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 586                         enable_nest(drive);
 587                 if (!drive->present)
 588                         /* drive not found */
 589                         return 0;
 590
 591                 /* identification failed? */
 592                 if (!drive->id_read) {
 593                         if (drive->media == ide_disk) {
 594                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 595                                         drive->name, drive->cyl,
 596                                         drive->head, drive->sect);
 597                         } else if (drive->media == ide_cdrom) {
 598                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 599                         } else {
 600                                 /* nuke it */
 601                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 602                                 drive->present = 0;
 603                         }
 604                 }
 605                 /* drive was found */
 606         }
 607         if(!drive->present)
 608                 return 0;
 609         /* The drive wasn't being helpful. Add generic info only */
 610         if(!drive->id_read)
 611                 generic_id(drive);
 612         return drive->present;
 613 }
 614
 615 static void hwif_release_dev (struct device *dev)
 616 {
 617         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 618
 619         up(&hwif->gendev_rel_sem);
 620 }
 621
 622 static void hwif_register (ide_hwif_t *hwif)
 623 {
 624         /* register with global device tree */
 625         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 626         hwif->gendev.driver_data = hwif;
 627         if (hwif->gendev.parent == NULL) {
 628                 if (hwif->pci_dev)
 629                         hwif->gendev.parent = &hwif->pci_dev->dev;
 630                 else
 631                         /* Would like to do = &device_legacy */
 632                         hwif->gendev.parent = NULL;
 633         }
 634         hwif->gendev.release = hwif_release_dev;
 635         device_register(&hwif->gendev);
 636 }
 637
 638 #ifdef CONFIG_PPC
 639 static int wait_hwif_ready(ide_hwif_t *hwif)
 640 {
 641         int rc;
 642
 643         printk(KERN_INFO "Probing IDE interface %s...\n", hwif->name);
 644
 645         /* Let HW settle down a bit from whatever init state we
 646          * come from */
 647         mdelay(2);
 648
 649         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 650          * I know of at least one disk who takes 31 seconds, I use 35
 651          * here to be safe
 652          */
 653         rc = ide_wait_not_busy(hwif, 35000);
 654         if (rc)
 655                 return rc;
 656
 657         /* Now make sure both master & slave are ready */
 658         SELECT_DRIVE(&hwif->drives[0]);
 659         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 660         mdelay(2);
 661         rc = ide_wait_not_busy(hwif, 10000);
 662         if (rc)
 663                 return rc;
 664         SELECT_DRIVE(&hwif->drives[1]);
 665         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 666         mdelay(2);
 667         rc = ide_wait_not_busy(hwif, 10000);
 668
 669         /* Exit function with master reselected (let's be sane) */
 670         SELECT_DRIVE(&hwif->drives[0]);
 671
 672         return rc;
 673 }
 674 #endif
 675
 676 /*
 677  * This routine only knows how to look for drive units 0 and 1
 678  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 679  */
 680 static void probe_hwif(ide_hwif_t *hwif)
 681 {
 682         unsigned int unit;
 683         unsigned long flags;
 684         unsigned int irqd;
 685
 686         if (hwif->noprobe)
 687                 return;
 688
 689         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 690 #ifdef CONFIG_BLK_DEV_PDC4030
 691             (hwif->chipset != ide_pdc4030 || hwif->channel == 0) &&
 692 #endif /* CONFIG_BLK_DEV_PDC4030 */
 693             (ide_hwif_request_regions(hwif))) {
 694                 u16 msgout = 0;
 695                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 696                         ide_drive_t *drive = &hwif->drives[unit];
 697                         if (drive->present) {
 698                                 drive->present = 0;
 699                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 700                                         drive->name);
 701                                 msgout = 1;
 702                         }
 703                 }
 704                 if (!msgout)
 705                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 706                                 hwif->name);
 707                 return;
 708         }
 709
 710         /*
 711          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 712          * we'll install our IRQ driver much later...
 713          */
 714         irqd = hwif->irq;
 715         if (irqd)
 716                 disable_irq(hwif->irq);
 717
 718         local_irq_set(flags);
 719
 720 #ifdef CONFIG_PPC
 721         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 722          * platforms. Typical cases are:
 723          *
 724          *  - The firmware hard reset the disk before booting the kernel,
 725          *    the drive is still doing it's poweron-reset sequence, that
 726          *    can take up to 30 seconds
 727          *  - The firmware does nothing (or no firmware), the device is
 728          *    still in POST state (same as above actually).
 729          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 730          *    their reset sequence even when they are non-selected slave
 731          *    devices, thus preventing discovery of the main HD
 732          *
 733          *  Doing this wait-for-busy should not harm any existing configuration
 734          *  (at least things won't be worse than what current code does, that
 735          *  is blindly go & talk to the drive) and fix some issues like the
 736          *  above.
 737          *
 738          *  BenH.
 739          */
 740         if (wait_hwif_ready(hwif))
 741                 printk(KERN_WARNING "%s: Wait for ready failed before probe !\n", hwif->name);
 742 #endif /* CONFIG_PPC */
 743
 744         /*
 745          * Second drive should only exist if first drive was found,
 746          * but a lot of cdrom drives are configured as single slaves.
 747          */
 748         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 749                 ide_drive_t *drive = &hwif->drives[unit];
 750                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 751                 (void) probe_for_drive(drive);
 752                 if (drive->present && !hwif->present) {
 753                         hwif->present = 1;
 754                         if (hwif->chipset != ide_4drives ||
 755                             !hwif->mate ||
 756                             !hwif->mate->present) {
 757                                 hwif_register(hwif);
 758                         }
 759                 }
 760         }
 761         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 762                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 763                 u8 stat;
 764
 765                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 766                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 767                 udelay(10);
 768                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 769                 do {
 770                         msleep(50);
 771                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 772                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 773
 774         }
 775         local_irq_restore(flags);
 776         /*
 777          * Use cached IRQ number. It might be (and is...) changed by probe
 778          * code above
 779          */
 780         if (irqd)
 781                 enable_irq(irqd);
 782
 783         if (!hwif->present) {
 784                 ide_hwif_release_regions(hwif);
 785                 return;
 786         }
 787
 788         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 789                 ide_drive_t *drive = &hwif->drives[unit];
 790
 791                 if (drive->present) {
 792                         if (hwif->tuneproc != NULL &&
 793                                 drive->autotune == IDE_TUNE_AUTO)
 794                                 /* auto-tune PIO mode */
 795                                 hwif->tuneproc(drive, 255);
 796                         /*
 797                          * MAJOR HACK BARF :-/
 798                          *
 799                          * FIXME: chipsets own this cruft!
 800                          */
 801                         /*
 802                          * Move here to prevent module loading clashing.
 803                          */
 804         //              drive->autodma = hwif->autodma;
 805                         if ((hwif->ide_dma_check) &&
 806                                 ((drive->autotune == IDE_TUNE_DEFAULT) ||
 807                                 (drive->autotune == IDE_TUNE_AUTO))) {
 808                                 /*
 809                                  * Force DMAing for the beginning of the check.
 810                                  * Some chipsets appear to do interesting
 811                                  * things, if not checked and cleared.
 812                                  *   PARANOIA!!!
 813                                  */
 814                                 hwif->ide_dma_off_quietly(drive);
 815 #ifdef CONFIG_IDEDMA_ONLYDISK
 816                                 if (drive->media == ide_disk)
 817 #endif
 818                                         hwif->ide_dma_check(drive);
 819                         }
 820                 }
 821         }
 822 }
 823
 824 static int hwif_init(ide_hwif_t *hwif);
 825 int probe_hwif_init (ide_hwif_t *hwif)
 826 {
 827         probe_hwif(hwif);
 828         hwif_init(hwif);
 829
 830         if (hwif->present) {
 831                 u16 unit = 0;
 832                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 833                         ide_drive_t *drive = &hwif->drives[unit];
 834                         /* For now don't attach absent drives, we may
 835                            want them on default or a new "empty" class
 836                            for hotplug reprobing ? */
 837                         if (drive->present) {
 838                                 ata_attach(drive);
 839                         }
 840                 }
 841         }
 842         return 0;
 843 }
 844
 845 EXPORT_SYMBOL(probe_hwif_init);
 846
 847 #if MAX_HWIFS > 1
 848 /*
 849  * save_match() is used to simplify logic in init_irq() below.
 850  *
 851  * A loophole here is that we may not know about a particular
 852  * hwif's irq until after that hwif is actually probed/initialized..
 853  * This could be a problem for the case where an hwif is on a
 854  * dual interface that requires serialization (eg. cmd640) and another
 855  * hwif using one of the same irqs is initialized beforehand.
 856  *
 857  * This routine detects and reports such situations, but does not fix them.
 858  */
 859 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 860 {
 861         ide_hwif_t *m = *match;
 862
 863         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 864                 if (!new->hwgroup)
 865                         return;
 866                 printk("%s: potential irq problem with %s and %s\n",
 867                         hwif->name, new->name, m->name);
 868         }
 869         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 870                 *match = new;
 871 }
 872 #endif /* MAX_HWIFS > 1 */
 873
 874 /*
 875  * init request queue
 876  */
 877 static int ide_init_queue(ide_drive_t *drive)
 878 {
 879         request_queue_t *q;
 880         ide_hwif_t *hwif = HWIF(drive);
 881         int max_sectors = 256;
 882         int max_sg_entries = PRD_ENTRIES;
 883
 884         /*
 885          *      Our default set up assumes the normal IDE case,
 886          *      that is 64K segmenting, standard PRD setup
 887          *      and LBA28. Some drivers then impose their own
 888          *      limits and LBA48 we could raise it but as yet
 889          *      do not.
 890          */
 891
 892         q = blk_init_queue(do_ide_request, &ide_lock);
 893         if (!q)
 894                 return 1;
 895
 896         q->queuedata = HWGROUP(drive);
 897         blk_queue_segment_boundary(q, 0xffff);
 898
 899         if (!hwif->rqsize)
 900                 hwif->rqsize = hwif->no_lba48 ? 256 : 65536;
 901         if (hwif->rqsize < max_sectors)
 902                 max_sectors = hwif->rqsize;
 903         blk_queue_max_sectors(q, max_sectors);
 904
 905 #ifdef CONFIG_PCI
 906         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 907          * creates segments that don't completely match our boundary
 908          * requirements and thus need to be broken up again. Because it
 909          * doesn't align properly neither, we may actually have to break up
 910          * to more segments than what was we got in the first place, a max
 911          * worst case is twice as many.
 912          * This will be fixed once we teach pci_map_sg() about our boundary
 913          * requirements, hopefully soon
 914          */
 915         if (!PCI_DMA_BUS_IS_PHYS)
 916                 max_sg_entries >>= 1;
 917 #endif /* CONFIG_PCI */
 918
 919         blk_queue_max_hw_segments(q, max_sg_entries);
 920         blk_queue_max_phys_segments(q, max_sg_entries);
 921
 922         /* assign drive and gendisk queue */
 923         drive->queue = q;
 924         if (drive->disk)
 925                 drive->disk->queue = drive->queue;
 926
 927         /* needs drive->queue to be set */
 928         ide_toggle_bounce(drive, 1);
 929
 930         /* enable led activity for disk drives only */
 931         if (drive->media == ide_disk && hwif->led_act)
 932                 blk_queue_activity_fn(q, hwif->led_act, drive);
 933
 934         return 0;
 935 }
 936
 937 /*
 938  * This routine sets up the irq for an ide interface, and creates a new
 939  * hwgroup for the irq/hwif if none was previously assigned.
 940  *
 941  * Much of the code is for correctly detecting/handling irq sharing
 942  * and irq serialization situations.  This is somewhat complex because
 943  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 944  *
 945  * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
 946  * interrupts completely disabled.  This can be bad for interrupt latency,
 947  * but anything else has led to problems on some machines.  We re-enable
 948  * interrupts as much as we can safely do in most places.
 949  */
 950 static int init_irq (ide_hwif_t *hwif)
 951 {
 952         unsigned int index;
 953         ide_hwgroup_t *hwgroup;
 954         ide_hwif_t *match = NULL;
 955
 956
 957         BUG_ON(in_interrupt());
 958         BUG_ON(irqs_disabled());
 959         down(&ide_cfg_sem);
 960         hwif->hwgroup = NULL;
 961 #if MAX_HWIFS > 1
 962         /*
 963          * Group up with any other hwifs that share our irq(s).
 964          */
 965         for (index = 0; index < MAX_HWIFS; index++) {
 966                 ide_hwif_t *h = &ide_hwifs[index];
 967                 if (h->hwgroup) {  /* scan only initialized hwif's */
 968                         if (hwif->irq == h->irq) {
 969                                 hwif->sharing_irq = h->sharing_irq = 1;
 970                                 if (hwif->chipset != ide_pci ||
 971                                     h->chipset != ide_pci) {
 972                                         save_match(hwif, h, &match);
 973                                 }
 974                         }
 975                         if (hwif->serialized) {
 976                                 if (hwif->mate && hwif->mate->irq == h->irq)
 977                                         save_match(hwif, h, &match);
 978                         }
 979                         if (h->serialized) {
 980                                 if (h->mate && hwif->irq == h->mate->irq)
 981                                         save_match(hwif, h, &match);
 982                         }
 983                 }
 984         }
 985 #endif /* MAX_HWIFS > 1 */
 986         /*
 987          * If we are still without a hwgroup, then form a new one
 988          */
 989         if (match) {
 990                 hwgroup = match->hwgroup;
 991                 hwif->hwgroup = hwgroup;
 992                 /*
 993                  * Link us into the hwgroup.
 994                  * This must be done early, do ensure that unexpected_intr
 995                  * can find the hwif and prevent irq storms.
 996                  * No drives are attached to the new hwif, choose_drive
 997                  * can't do anything stupid (yet).
 998                  * Add ourself as the 2nd entry to the hwgroup->hwif
 999                  * linked list, the first entry is the hwif that owns
1000                  * hwgroup->handler - do not change that.
1001                  */
1002                 spin_lock_irq(&ide_lock);
1003                 hwif->next = hwgroup->hwif->next;
1004                 hwgroup->hwif->next = hwif;
1005                 spin_unlock_irq(&ide_lock);
1006         } else {
1007                 hwgroup = kmalloc(sizeof(ide_hwgroup_t),GFP_KERNEL);
1008                 if (!hwgroup)
1009                         goto out_up;
1010
1011                 hwif->hwgroup = hwgroup;
1012
1013                 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1014                 hwgroup->hwif     = hwif->next = hwif;
1015                 hwgroup->rq       = NULL;
1016                 hwgroup->handler  = NULL;
1017                 hwgroup->drive    = NULL;
1018                 hwgroup->busy     = 0;
1019                 init_timer(&hwgroup->timer);
1020                 hwgroup->timer.function = &ide_timer_expiry;
1021                 hwgroup->timer.data = (unsigned long) hwgroup;
1022         }
1023
1024         /*
1025          * Allocate the irq, if not already obtained for another hwif
1026          */
1027         if (!match || match->irq != hwif->irq) {
1028                 int sa = SA_INTERRUPT;
1029 #if defined(__mc68000__) || defined(CONFIG_APUS)
1030                 sa = SA_SHIRQ;
1031 #endif /* __mc68000__ || CONFIG_APUS */
1032
1033                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1034                         sa = SA_SHIRQ;
1035 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1036                         sa |= SA_INTERRUPT;
1037 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1038                 }
1039
1040                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1041                         /* clear nIEN */
1042                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1043
1044                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1045                         goto out_unlink;
1046         }
1047
1048         /*
1049          * For any present drive:
1050          * - allocate the block device queue
1051          * - link drive into the hwgroup
1052          */
1053         for (index = 0; index < MAX_DRIVES; ++index) {
1054                 ide_drive_t *drive = &hwif->drives[index];
1055                 if (!drive->present)
1056                         continue;
1057                 if (ide_init_queue(drive)) {
1058                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1059                         continue;
1060                 }
1061                 spin_lock_irq(&ide_lock);
1062                 if (!hwgroup->drive) {
1063                         /* first drive for hwgroup. */
1064                         drive->next = drive;
1065                         hwgroup->drive = drive;
1066                         hwgroup->hwif = HWIF(hwgroup->drive);
1067                 } else {
1068                         drive->next = hwgroup->drive->next;
1069                         hwgroup->drive->next = drive;
1070                 }
1071                 spin_unlock_irq(&ide_lock);
1072         }
1073
1074 #if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
1075         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1076                 hwif->io_ports[IDE_DATA_OFFSET],
1077                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1078                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1079 #elif defined(__sparc__)
1080         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
1081                 hwif->io_ports[IDE_DATA_OFFSET],
1082                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1083                 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
1084 #else
1085         printk("%s at 0x%08lx on irq %d", hwif->name,
1086                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1087 #endif /* __mc68000__ && CONFIG_APUS */
1088         if (match)
1089                 printk(" (%sed with %s)",
1090                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1091         printk("\n");
1092         up(&ide_cfg_sem);
1093         return 0;
1094 out_unlink:
1095         spin_lock_irq(&ide_lock);
1096         if (hwif->next == hwif) {
1097                 BUG_ON(match);
1098                 BUG_ON(hwgroup->hwif != hwif);
1099                 kfree(hwgroup);
1100         } else {
1101                 ide_hwif_t *g;
1102                 g = hwgroup->hwif;
1103                 while (g->next != hwif)
1104                         g = g->next;
1105                 g->next = hwif->next;
1106                 if (hwgroup->hwif == hwif) {
1107                         /* Impossible. */
1108                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1109                         hwgroup->hwif = g;
1110                 }
1111                 BUG_ON(hwgroup->hwif == hwif);
1112         }
1113         spin_unlock_irq(&ide_lock);
1114 out_up:
1115         up(&ide_cfg_sem);
1116         return 1;
1117 }
1118
1119 static int ata_lock(dev_t dev, void *data)
1120 {
1121         /* FIXME: we want to pin hwif down */
1122         return 0;
1123 }
1124
1125 extern ide_driver_t idedefault_driver;
1126
1127 struct kobject *ata_probe(dev_t dev, int *part, void *data)
1128 {
1129         ide_hwif_t *hwif = data;
1130         int unit = *part >> PARTN_BITS;
1131         ide_drive_t *drive = &hwif->drives[unit];
1132         if (!drive->present)
1133                 return NULL;
1134         if (drive->driver == &idedefault_driver) {
1135                 if (drive->media == ide_disk)
1136                         (void) request_module("ide-disk");
1137                 if (drive->scsi)
1138                         (void) request_module("ide-scsi");
1139                 if (drive->media == ide_cdrom || drive->media == ide_optical)
1140                         (void) request_module("ide-cd");
1141                 if (drive->media == ide_tape)
1142                         (void) request_module("ide-tape");
1143                 if (drive->media == ide_floppy)
1144                         (void) request_module("ide-floppy");
1145         }
1146         if (drive->driver == &idedefault_driver)
1147                 return NULL;
1148         *part &= (1 << PARTN_BITS) - 1;
1149         return get_disk(drive->disk);
1150 }
1151
1152 static int alloc_disks(ide_hwif_t *hwif)
1153 {
1154         unsigned int unit;
1155         struct gendisk *disks[MAX_DRIVES];
1156
1157         for (unit = 0; unit < MAX_DRIVES; unit++) {
1158                 disks[unit] = alloc_disk(1 << PARTN_BITS);
1159                 if (!disks[unit])
1160                         goto Enomem;
1161         }
1162         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1163                 ide_drive_t *drive = &hwif->drives[unit];
1164                 struct gendisk *disk = disks[unit];
1165                 disk->major  = hwif->major;
1166                 disk->first_minor = unit << PARTN_BITS;
1167                 sprintf(disk->disk_name,"hd%c",'a'+hwif->index*MAX_DRIVES+unit);
1168                 disk->fops = ide_fops;
1169                 disk->private_data = drive;
1170                 drive->disk = disk;
1171         }
1172         return 0;
1173 Enomem:
1174         printk(KERN_WARNING "(ide::init_gendisk) Out of memory\n");
1175         while (unit--)
1176                 put_disk(disks[unit]);
1177         return -ENOMEM;
1178 }
1179
1180 static void drive_release_dev (struct device *dev)
1181 {
1182         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1183
1184         up(&drive->gendev_rel_sem);
1185 }
1186
1187 /*
1188  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1189  * after probing for drives, to allocate partition tables and other data
1190  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1191  * somewhat later, during the partition check.
1192  */
1193 static void init_gendisk (ide_hwif_t *hwif)
1194 {
1195         unsigned int unit;
1196
1197         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1198                 ide_drive_t * drive = &hwif->drives[unit];
1199                 ide_add_generic_settings(drive);
1200                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1201                          hwif->index,unit);
1202                 drive->gendev.parent = &hwif->gendev;
1203                 drive->gendev.bus = &ide_bus_type;
1204                 drive->gendev.driver_data = drive;
1205                 drive->gendev.release = drive_release_dev;
1206                 if (drive->present) {
1207                         device_register(&drive->gendev);
1208                         sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
1209                                 (hwif->channel && hwif->mate) ?
1210                                 hwif->mate->index : hwif->index,
1211                                 hwif->channel, unit, drive->lun);
1212                 }
1213         }
1214         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1215                         THIS_MODULE, ata_probe, ata_lock, hwif);
1216 }
1217
1218 static int hwif_init(ide_hwif_t *hwif)
1219 {
1220         int old_irq, unit;
1221
1222         if (!hwif->present)
1223                 return 0;
1224
1225         if (!hwif->irq) {
1226                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1227                 {
1228                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1229                         return (hwif->present = 0);
1230                 }
1231         }
1232 #ifdef CONFIG_BLK_DEV_HD
1233         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1234                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1235                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1236                 return (hwif->present = 0);
1237         }
1238 #endif /* CONFIG_BLK_DEV_HD */
1239
1240         /* we set it back to 1 if all is ok below */
1241         hwif->present = 0;
1242
1243         if (register_blkdev(hwif->major, hwif->name))
1244                 return 0;
1245
1246         if (alloc_disks(hwif) < 0)
1247                 goto out;
1248
1249         if (init_irq(hwif) == 0)
1250                 goto done;
1251
1252         old_irq = hwif->irq;
1253         /*
1254          *      It failed to initialise. Find the default IRQ for
1255          *      this port and try that.
1256          */
1257         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1258                 printk("%s: Disabled unable to get IRQ %d.\n",
1259                         hwif->name, old_irq);
1260                 goto out_disks;
1261         }
1262         if (init_irq(hwif)) {
1263                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1264                         hwif->name, old_irq, hwif->irq);
1265                 goto out_disks;
1266         }
1267         printk("%s: probed IRQ %d failed, using default.\n",
1268                 hwif->name, hwif->irq);
1269
1270 done:
1271         init_gendisk(hwif);
1272         hwif->present = 1;      /* success */
1273         return 1;
1274
1275 out_disks:
1276         for (unit = 0; unit < MAX_DRIVES; unit++) {
1277                 struct gendisk *disk = hwif->drives[unit].disk;
1278                 hwif->drives[unit].disk = NULL;
1279                 put_disk(disk);
1280         }
1281 out:
1282         unregister_blkdev(hwif->major, hwif->name);
1283         return 0;
1284 }
1285
1286 int ideprobe_init (void)
1287 {
1288         unsigned int index;
1289         int probe[MAX_HWIFS];
1290
1291         memset(probe, 0, MAX_HWIFS * sizeof(int));
1292         for (index = 0; index < MAX_HWIFS; ++index)
1293                 probe[index] = !ide_hwifs[index].present;
1294
1295         /*
1296          * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
1297          */
1298         for (index = 0; index < MAX_HWIFS; ++index)
1299                 if (probe[index])
1300                         probe_hwif(&ide_hwifs[index]);
1301         for (index = 0; index < MAX_HWIFS; ++index)
1302                 if (probe[index])
1303                         hwif_init(&ide_hwifs[index]);
1304         for (index = 0; index < MAX_HWIFS; ++index) {
1305                 if (probe[index]) {
1306                         ide_hwif_t *hwif = &ide_hwifs[index];
1307                         int unit;
1308                         if (!hwif->present)
1309                                 continue;
1310                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1311                                 hwif->chipset = ide_generic;
1312                         for (unit = 0; unit < MAX_DRIVES; ++unit)
1313                                 if (hwif->drives[unit].present)
1314                                         ata_attach(&hwif->drives[unit]);
1315                 }
1316         }
1317         return 0;
1318 }
1319
1320 EXPORT_SYMBOL_GPL(ideprobe_init);