drivers/ide/ide-probe.c

   1 /*
   2  *  linux/drivers/ide/ide-probe.c       Version 1.11    Mar 05, 2003
   3  *
   4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5  */
   6
   7 /*
   8  *  Mostly written by Mark Lord <mlord@pobox.com>
   9  *                and Gadi Oxman <gadio@netvision.net.il>
  10  *                and Andre Hedrick <andre@linux-ide.org>
  11  *
  12  *  See linux/MAINTAINERS for address of current maintainer.
  13  *
  14  * This is the IDE probe module, as evolved from hd.c and ide.c.
  15  *
  16  * Version 1.00         move drive probing code from ide.c to ide-probe.c
  17  * Version 1.01         fix compilation problem for m68k
  18  * Version 1.02         increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  19  *                       by Andrea Arcangeli
  20  * Version 1.03         fix for (hwif->chipset == ide_4drives)
  21  * Version 1.04         fixed buggy treatments of known flash memory cards
  22  *
  23  * Version 1.05         fix for (hwif->chipset == ide_pdc4030)
  24  *                      added ide6/7/8/9
  25  *                      allowed for secondary flash card to be detectable
  26  *                       with new flag : drive->ata_flash : 1;
  27  * Version 1.06         stream line request queue and prep for cascade project.
  28  * Version 1.07         max_sect <= 255; slower disks would get behind and
  29  *                      then fall over when they get to 256.    Paul G.
  30  * Version 1.10         Update set for new IDE. drive->id is now always
  31  *                      valid after probe time even with noprobe
  32  */
  33
  34 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
  35
  36 #include <linux/config.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/string.h>
  40 #include <linux/kernel.h>
  41 #include <linux/timer.h>
  42 #include <linux/mm.h>
  43 #include <linux/interrupt.h>
  44 #include <linux/major.h>
  45 #include <linux/errno.h>
  46 #include <linux/genhd.h>
  47 #include <linux/slab.h>
  48 #include <linux/delay.h>
  49 #include <linux/ide.h>
  50 #include <linux/spinlock.h>
  51 #include <linux/pci.h>
  52 #include <linux/kmod.h>
  53
  54 #include <asm/byteorder.h>
  55 #include <asm/irq.h>
  56 #include <asm/uaccess.h>
  57 #include <asm/io.h>
  58
  59 /**
  60  *      generic_id              -       add a generic drive id
  61  *      @drive: drive to make an ID block for
  62  *
  63  *      Add a fake id field to the drive we are passed. This allows
  64  *      use to skip a ton of NULL checks (which people always miss)
  65  *      and make drive properties unconditional outside of this file
  66  */
  67
  68 static void generic_id(ide_drive_t *drive)
  69 {
  70         drive->id->cyls = drive->cyl;
  71         drive->id->heads = drive->head;
  72         drive->id->sectors = drive->sect;
  73         drive->id->cur_cyls = drive->cyl;
  74         drive->id->cur_heads = drive->head;
  75         drive->id->cur_sectors = drive->sect;
  76 }
  77
  78 /**
  79  *      drive_is_flashcard      -       check for compact flash
  80  *      @drive: drive to check
  81  *
  82  *      CompactFlash cards and their brethern pretend to be removable
  83  *      hard disks, except:
  84  *              (1) they never have a slave unit, and
  85  *              (2) they don't have doorlock mechanisms.
  86  *      This test catches them, and is invoked elsewhere when setting
  87  *      appropriate config bits.
  88  *
  89  *      FIXME: This treatment is probably applicable for *all* PCMCIA (PC CARD)
  90  *      devices, so in linux 2.3.x we should change this to just treat all
  91  *      PCMCIA  drives this way, and get rid of the model-name tests below
  92  *      (too big of an interface change for 2.4.x).
  93  *      At that time, we might also consider parameterizing the timeouts and
  94  *      retries, since these are MUCH faster than mechanical drives. -M.Lord
  95  */
  96
  97 static inline int drive_is_flashcard (ide_drive_t *drive)
  98 {
  99         struct hd_driveid *id = drive->id;
 100
 101         if (drive->removable) {
 102                 if (id->config == 0x848a) return 1;     /* CompactFlash */
 103                 if (!strncmp(id->model, "KODAK ATA_FLASH", 15)  /* Kodak */
 104                  || !strncmp(id->model, "Hitachi CV", 10)       /* Hitachi */
 105                  || !strncmp(id->model, "SunDisk SDCFB", 13)    /* SunDisk */
 106                  || !strncmp(id->model, "HAGIWARA HPC", 12)     /* Hagiwara */
 107                  || !strncmp(id->model, "LEXAR ATA_FLASH", 15)  /* Lexar */
 108                  || !strncmp(id->model, "ATA_FLASH", 9))        /* Simple Tech */
 109                 {
 110                         return 1;       /* yes, it is a flash memory card */
 111                 }
 112         }
 113         return 0;       /* no, it is not a flash memory card */
 114 }
 115
 116 /**
 117  *      do_identify     -       identify a drive
 118  *      @drive: drive to identify
 119  *      @cmd: command used
 120  *
 121  *      Called when we have issued a drive identify command to
 122  *      read and parse the results. This function is run with
 123  *      interrupts disabled.
 124  */
 125
 126 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 127 {
 128         ide_hwif_t *hwif = HWIF(drive);
 129         int bswap = 1;
 130         struct hd_driveid *id;
 131
 132         id = drive->id;
 133         /* read 512 bytes of id info */
 134         hwif->ata_input_data(drive, id, SECTOR_WORDS);
 135
 136         drive->id_read = 1;
 137         local_irq_enable();
 138         ide_fix_driveid(id);
 139
 140         if (!drive->forced_lun)
 141                 drive->last_lun = id->last_lun & 0x7;
 142
 143 #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 144         /*
 145          * EATA SCSI controllers do a hardware ATA emulation:
 146          * Ignore them if there is a driver for them available.
 147          */
 148         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 149             (id->model[0] == 'S' && id->model[1] == 'K')) {
 150                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 151                 goto err_misc;
 152         }
 153 #endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
 154
 155         /*
 156          *  WIN_IDENTIFY returns little-endian info,
 157          *  WIN_PIDENTIFY *usually* returns little-endian info.
 158          */
 159         if (cmd == WIN_PIDENTIFY) {
 160                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 161                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 162                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 163                         /* Vertos drives may still be weird */
 164                         bswap ^= 1;
 165         }
 166         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 167         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 168         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 169
 170         if (strstr(id->model, "E X A B Y T E N E S T"))
 171                 goto err_misc;
 172
 173         /* we depend on this a lot! */
 174         id->model[sizeof(id->model)-1] = '\0';
 175         printk("%s: %s, ", drive->name, id->model);
 176         drive->present = 1;
 177         drive->dead = 0;
 178
 179         /*
 180          * Check for an ATAPI device
 181          */
 182         if (cmd == WIN_PIDENTIFY) {
 183                 u8 type = (id->config >> 8) & 0x1f;
 184                 printk("ATAPI ");
 185 #ifdef CONFIG_BLK_DEV_PDC4030
 186                 if (hwif->channel == 1 && hwif->chipset == ide_pdc4030) {
 187                         printk(" -- not supported on 2nd Promise port\n");
 188                         goto err_misc;
 189                 }
 190 #endif /* CONFIG_BLK_DEV_PDC4030 */
 191                 switch (type) {
 192                         case ide_floppy:
 193                                 if (!strstr(id->model, "CD-ROM")) {
 194                                         if (!strstr(id->model, "oppy") &&
 195                                             !strstr(id->model, "poyp") &&
 196                                             !strstr(id->model, "ZIP"))
 197                                                 printk("cdrom or floppy?, assuming ");
 198                                         if (drive->media != ide_cdrom) {
 199                                                 printk ("FLOPPY");
 200                                                 drive->removable = 1;
 201                                                 break;
 202                                         }
 203                                 }
 204                                 /* Early cdrom models used zero */
 205                                 type = ide_cdrom;
 206                         case ide_cdrom:
 207                                 drive->removable = 1;
 208 #ifdef CONFIG_PPC
 209                                 /* kludge for Apple PowerBook internal zip */
 210                                 if (!strstr(id->model, "CD-ROM") &&
 211                                     strstr(id->model, "ZIP")) {
 212                                         printk ("FLOPPY");
 213                                         type = ide_floppy;
 214                                         break;
 215                                 }
 216 #endif
 217                                 printk ("CD/DVD-ROM");
 218                                 break;
 219                         case ide_tape:
 220                                 printk ("TAPE");
 221                                 break;
 222                         case ide_optical:
 223                                 printk ("OPTICAL");
 224                                 drive->removable = 1;
 225                                 break;
 226                         default:
 227                                 printk("UNKNOWN (type %d)", type);
 228                                 break;
 229                 }
 230                 printk (" drive\n");
 231                 drive->media = type;
 232                 return;
 233         }
 234
 235         /*
 236          * Not an ATAPI device: looks like a "regular" hard disk
 237          */
 238         if (id->config & (1<<7))
 239                 drive->removable = 1;
 240
 241         if (drive_is_flashcard(drive))
 242                 drive->is_flash = 1;
 243         drive->media = ide_disk;
 244         printk("%s DISK drive\n", (drive->is_flash) ? "CFA" : "ATA" );
 245         QUIRK_LIST(drive);
 246
 247         /* Initialize queue depth settings */
 248         drive->queue_depth = 1;
 249 #ifdef CONFIG_BLK_DEV_IDE_TCQ_DEPTH
 250         drive->queue_depth = CONFIG_BLK_DEV_IDE_TCQ_DEPTH;
 251 #else
 252         drive->queue_depth = drive->id->queue_depth + 1;
 253 #endif
 254         if (drive->queue_depth < 1 || drive->queue_depth > IDE_MAX_TAG)
 255                 drive->queue_depth = IDE_MAX_TAG;
 256
 257         return;
 258
 259 err_misc:
 260         kfree(id);
 261         drive->present = 0;
 262         return;
 263 }
 264
 265 /**
 266  *      actual_try_to_identify  -       send ata/atapi identify
 267  *      @drive: drive to identify
 268  *      @cmd: command to use
 269  *
 270  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 271  *      and waits for a response.  It also monitors irqs while this is
 272  *      happening, in hope of automatically determining which one is
 273  *      being used by the interface.
 274  *
 275  *      Returns:        0  device was identified
 276  *                      1  device timed-out (no response to identify request)
 277  *                      2  device aborted the command (refused to identify itself)
 278  */
 279
 280 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 281 {
 282         ide_hwif_t *hwif = HWIF(drive);
 283         int rc;
 284         unsigned long hd_status;
 285         unsigned long timeout;
 286         u8 s = 0, a = 0;
 287
 288         if (IDE_CONTROL_REG) {
 289                 /* take a deep breath */
 290                 ide_delay_50ms();
 291                 a = hwif->INB(IDE_ALTSTATUS_REG);
 292                 s = hwif->INB(IDE_STATUS_REG);
 293                 if ((a ^ s) & ~INDEX_STAT) {
 294                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 295                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 296                         /* ancient Seagate drives, broken interfaces */
 297                         hd_status = IDE_STATUS_REG;
 298                 } else {
 299                         /* use non-intrusive polling */
 300                         hd_status = IDE_ALTSTATUS_REG;
 301                 }
 302         } else {
 303                 ide_delay_50ms();
 304                 hd_status = IDE_STATUS_REG;
 305         }
 306
 307         /* set features register for atapi
 308          * identify command to be sure of reply
 309          */
 310         if ((cmd == WIN_PIDENTIFY))
 311                 /* disable dma & overlap */
 312                 hwif->OUTB(0, IDE_FEATURE_REG);
 313
 314         if (hwif->identify != NULL) {
 315                 if (hwif->identify(drive))
 316                         return 1;
 317         } else {
 318                 /* ask drive for ID */
 319                 hwif->OUTB(cmd, IDE_COMMAND_REG);
 320         }
 321         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 322         timeout += jiffies;
 323         do {
 324                 if (time_after(jiffies, timeout)) {
 325                         /* drive timed-out */
 326                         return 1;
 327                 }
 328                 /* give drive a breather */
 329                 ide_delay_50ms();
 330         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 331
 332         /* wait for IRQ and DRQ_STAT */
 333         ide_delay_50ms();
 334         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 335                 unsigned long flags;
 336
 337                 /* local CPU only; some systems need this */
 338                 local_irq_save(flags);
 339                 /* drive returned ID */
 340                 do_identify(drive, cmd);
 341                 /* drive responded with ID */
 342                 rc = 0;
 343                 /* clear drive IRQ */
 344                 (void) hwif->INB(IDE_STATUS_REG);
 345                 local_irq_restore(flags);
 346         } else {
 347                 /* drive refused ID */
 348                 rc = 2;
 349         }
 350         return rc;
 351 }
 352
 353 /**
 354  *      try_to_identify -       try to identify a drive
 355  *      @drive: drive to probe
 356  *      @cmd: command to use
 357  *
 358  *      Issue the identify command and then do IRQ probing to
 359  *      complete the identification when needed by finding the
 360  *      IRQ the drive is attached to
 361  */
 362
 363 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 364 {
 365         ide_hwif_t *hwif = HWIF(drive);
 366         int retval;
 367         int autoprobe = 0;
 368         unsigned long cookie = 0;
 369
 370         /*
 371          * Disable device irq unless we need to
 372          * probe for it. Otherwise we'll get spurious
 373          * interrupts during the identify-phase that
 374          * the irq handler isn't expecting.
 375          */
 376         if (IDE_CONTROL_REG) {
 377                 u8 ctl = drive->ctl | 2;
 378                 if (!hwif->irq) {
 379                         autoprobe = 1;
 380                         cookie = probe_irq_on();
 381                         /* enable device irq */
 382                         ctl &= ~2;
 383                 }
 384                 hwif->OUTB(ctl, IDE_CONTROL_REG);
 385         }
 386
 387         retval = actual_try_to_identify(drive, cmd);
 388
 389         if (autoprobe) {
 390                 int irq;
 391                 /* mask device irq */
 392                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 393                 /* clear drive IRQ */
 394                 (void) hwif->INB(IDE_STATUS_REG);
 395                 udelay(5);
 396                 irq = probe_irq_off(cookie);
 397                 if (!hwif->irq) {
 398                         if (irq > 0) {
 399                                 hwif->irq = irq;
 400                         } else {
 401                                 /* Mmmm.. multiple IRQs..
 402                                  * don't know which was ours
 403                                  */
 404                                 printk("%s: IRQ probe failed (0x%lx)\n",
 405                                         drive->name, cookie);
 406 #ifdef CONFIG_BLK_DEV_CMD640
 407 #ifdef CMD640_DUMP_REGS
 408                                 if (hwif->chipset == ide_cmd640) {
 409                                         printk("%s: Hmmm.. probably a driver "
 410                                                 "problem.\n", drive->name);
 411                                         CMD640_DUMP_REGS;
 412                                 }
 413 #endif /* CMD640_DUMP_REGS */
 414 #endif /* CONFIG_BLK_DEV_CMD640 */
 415                         }
 416                 }
 417         }
 418         return retval;
 419 }
 420
 421
 422 /**
 423  *      do_probe                -       probe an IDE device
 424  *      @drive: drive to probe
 425  *      @cmd: command to use
 426  *
 427  *      do_probe() has the difficult job of finding a drive if it exists,
 428  *      without getting hung up if it doesn't exist, without trampling on
 429  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 430  *
 431  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 432  *      but does not respond right away, the probe will "hang in there"
 433  *      for the maximum wait time (about 30 seconds), otherwise it will
 434  *      exit much more quickly.
 435  *
 436  * Returns:     0  device was identified
 437  *              1  device timed-out (no response to identify request)
 438  *              2  device aborted the command (refused to identify itself)
 439  *              3  bad status from device (possible for ATAPI drives)
 440  *              4  probe was not attempted because failure was obvious
 441  */
 442
 443 static int do_probe (ide_drive_t *drive, u8 cmd)
 444 {
 445         int rc;
 446         ide_hwif_t *hwif = HWIF(drive);
 447
 448         if (drive->present) {
 449                 /* avoid waiting for inappropriate probes */
 450                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 451                         return 4;
 452         }
 453 #ifdef DEBUG
 454         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 455                 drive->name, drive->present, drive->media,
 456                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 457 #endif
 458
 459         /* needed for some systems
 460          * (e.g. crw9624 as drive0 with disk as slave)
 461          */
 462         ide_delay_50ms();
 463         SELECT_DRIVE(drive);
 464         ide_delay_50ms();
 465         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 466                 if (drive->select.b.unit != 0) {
 467                         /* exit with drive0 selected */
 468                         SELECT_DRIVE(&hwif->drives[0]);
 469                         /* allow BUSY_STAT to assert & clear */
 470                         ide_delay_50ms();
 471                 }
 472                 /* no i/f present: mmm.. this should be a 4 -ml */
 473                 return 3;
 474         }
 475
 476         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 477             drive->present || cmd == WIN_PIDENTIFY) {
 478                 /* send cmd and wait */
 479                 if ((rc = try_to_identify(drive, cmd))) {
 480                         /* failed: try again */
 481                         rc = try_to_identify(drive,cmd);
 482                 }
 483                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 484                         return 4;
 485
 486                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 487                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 488                         (drive->autotune == IDE_TUNE_AUTO))) {
 489                         unsigned long timeout;
 490                         printk("%s: no response (status = 0x%02x), "
 491                                 "resetting drive\n", drive->name,
 492                                 hwif->INB(IDE_STATUS_REG));
 493                         ide_delay_50ms();
 494                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 495                         ide_delay_50ms();
 496                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 497                         timeout = jiffies;
 498                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
 499                                time_before(jiffies, timeout + WAIT_WORSTCASE))
 500                                 ide_delay_50ms();
 501                         rc = try_to_identify(drive, cmd);
 502                 }
 503                 if (rc == 1)
 504                         printk("%s: no response (status = 0x%02x)\n",
 505                                 drive->name, hwif->INB(IDE_STATUS_REG));
 506                 /* ensure drive irq is clear */
 507                 (void) hwif->INB(IDE_STATUS_REG);
 508         } else {
 509                 /* not present or maybe ATAPI */
 510                 rc = 3;
 511         }
 512         if (drive->select.b.unit != 0) {
 513                 /* exit with drive0 selected */
 514                 SELECT_DRIVE(&hwif->drives[0]);
 515                 ide_delay_50ms();
 516                 /* ensure drive irq is clear */
 517                 (void) hwif->INB(IDE_STATUS_REG);
 518         }
 519         return rc;
 520 }
 521
 522 /*
 523  *
 524  */
 525 static void enable_nest (ide_drive_t *drive)
 526 {
 527         ide_hwif_t *hwif = HWIF(drive);
 528         unsigned long timeout;
 529
 530         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 531         SELECT_DRIVE(drive);
 532         ide_delay_50ms();
 533         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 534         timeout = jiffies + WAIT_WORSTCASE;
 535         do {
 536                 if (time_after(jiffies, timeout)) {
 537                         printk("failed (timeout)\n");
 538                         return;
 539                 }
 540                 ide_delay_50ms();
 541         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 542
 543         ide_delay_50ms();
 544
 545         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 546                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 547         } else {
 548                 printk("success\n");
 549         }
 550
 551         /* if !(success||timed-out) */
 552         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 553                 /* look for ATAPI device */
 554                 (void) do_probe(drive, WIN_PIDENTIFY);
 555         }
 556 }
 557
 558 /**
 559  *      probe_for_drives        -       upper level drive probe
 560  *      @drive: drive to probe for
 561  *
 562  *      probe_for_drive() tests for existence of a given drive using do_probe()
 563  *      and presents things to the user as needed.
 564  *
 565  *      Returns:        0  no device was found
 566  *                      1  device was found (note: drive->present might
 567  *                         still be 0)
 568  */
 569
 570 static inline u8 probe_for_drive (ide_drive_t *drive)
 571 {
 572         /*
 573          *      In order to keep things simple we have an id
 574          *      block for all drives at all times. If the device
 575          *      is pre ATA or refuses ATA/ATAPI identify we
 576          *      will add faked data to this.
 577          *
 578          *      Also note that 0 everywhere means "can't do X"
 579          */
 580
 581         drive->id = kmalloc(SECTOR_WORDS *4, GFP_KERNEL);
 582         drive->id_read = 0;
 583         if(drive->id == NULL)
 584         {
 585                 printk(KERN_ERR "ide: out of memory for id data.\n");
 586                 return 0;
 587         }
 588         memset(drive->id, 0, SECTOR_WORDS * 4);
 589         strcpy(drive->id->model, "UNKNOWN");
 590
 591         /* skip probing? */
 592         if (!drive->noprobe)
 593         {
 594                 /* if !(success||timed-out) */
 595                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 596                         /* look for ATAPI device */
 597                         (void) do_probe(drive, WIN_PIDENTIFY);
 598                 }
 599                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 600                         enable_nest(drive);
 601                 if (!drive->present)
 602                         /* drive not found */
 603                         return 0;
 604
 605                 /* identification failed? */
 606                 if (!drive->id_read) {
 607                         if (drive->media == ide_disk) {
 608                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 609                                         drive->name, drive->cyl,
 610                                         drive->head, drive->sect);
 611                         } else if (drive->media == ide_cdrom) {
 612                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 613                         } else {
 614                                 /* nuke it */
 615                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 616                                 drive->present = 0;
 617                         }
 618                 }
 619                 /* drive was found */
 620         }
 621         if(!drive->present)
 622                 return 0;
 623         /* The drive wasn't being helpful. Add generic info only */
 624         if(!drive->id_read)
 625                 generic_id(drive);
 626         return drive->present;
 627 }
 628
 629 static void hwif_release_dev (struct device *dev)
 630 {
 631         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 632
 633         up(&hwif->gendev_rel_sem);
 634 }
 635
 636 static void hwif_register (ide_hwif_t *hwif)
 637 {
 638         /* register with global device tree */
 639         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 640         hwif->gendev.driver_data = hwif;
 641         if (hwif->gendev.parent == NULL) {
 642                 if (hwif->pci_dev)
 643                         hwif->gendev.parent = &hwif->pci_dev->dev;
 644                 else
 645                         /* Would like to do = &device_legacy */
 646                         hwif->gendev.parent = NULL;
 647         }
 648         hwif->gendev.release = hwif_release_dev;
 649         device_register(&hwif->gendev);
 650 }
 651
 652 //EXPORT_SYMBOL(hwif_register);
 653
 654 #ifdef CONFIG_PPC
 655 static int wait_hwif_ready(ide_hwif_t *hwif)
 656 {
 657         int rc;
 658
 659         printk(KERN_INFO "Probing IDE interface %s...\n", hwif->name);
 660
 661         /* Let HW settle down a bit from whatever init state we
 662          * come from */
 663         mdelay(2);
 664
 665         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 666          * I know of at least one disk who takes 31 seconds, I use 35
 667          * here to be safe
 668          */
 669         rc = ide_wait_not_busy(hwif, 35000);
 670         if (rc)
 671                 return rc;
 672
 673         /* Now make sure both master & slave are ready */
 674         SELECT_DRIVE(&hwif->drives[0]);
 675         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 676         mdelay(2);
 677         rc = ide_wait_not_busy(hwif, 10000);
 678         if (rc)
 679                 return rc;
 680         SELECT_DRIVE(&hwif->drives[1]);
 681         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 682         mdelay(2);
 683         rc = ide_wait_not_busy(hwif, 10000);
 684
 685         /* Exit function with master reselected (let's be sane) */
 686         SELECT_DRIVE(&hwif->drives[0]);
 687
 688         return rc;
 689 }
 690 #endif
 691
 692 /*
 693  * This routine only knows how to look for drive units 0 and 1
 694  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 695  */
 696 void probe_hwif (ide_hwif_t *hwif)
 697 {
 698         unsigned int unit;
 699         unsigned long flags;
 700         unsigned int irqd;
 701
 702         if (hwif->noprobe)
 703                 return;
 704
 705         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 706 #ifdef CONFIG_BLK_DEV_PDC4030
 707             (hwif->chipset != ide_pdc4030 || hwif->channel == 0) &&
 708 #endif /* CONFIG_BLK_DEV_PDC4030 */
 709             (ide_hwif_request_regions(hwif))) {
 710                 u16 msgout = 0;
 711                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 712                         ide_drive_t *drive = &hwif->drives[unit];
 713                         if (drive->present) {
 714                                 drive->present = 0;
 715                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 716                                         drive->name);
 717                                 msgout = 1;
 718                         }
 719                 }
 720                 if (!msgout)
 721                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 722                                 hwif->name);
 723                 return;
 724         }
 725
 726         /*
 727          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 728          * we'll install our IRQ driver much later...
 729          */
 730         irqd = hwif->irq;
 731         if (irqd)
 732                 disable_irq(hwif->irq);
 733
 734         local_irq_set(flags);
 735
 736 #ifdef CONFIG_PPC
 737         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 738          * platforms. Typical cases are:
 739          *
 740          *  - The firmware hard reset the disk before booting the kernel,
 741          *    the drive is still doing it's poweron-reset sequence, that
 742          *    can take up to 30 seconds
 743          *  - The firmware does nothing (or no firmware), the device is
 744          *    still in POST state (same as above actually).
 745          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 746          *    their reset sequence even when they are non-selected slave
 747          *    devices, thus preventing discovery of the main HD
 748          *
 749          *  Doing this wait-for-busy should not harm any existing configuration
 750          *  (at least things won't be worse than what current code does, that
 751          *  is blindly go & talk to the drive) and fix some issues like the
 752          *  above.
 753          *
 754          *  BenH.
 755          */
 756         if (wait_hwif_ready(hwif))
 757                 printk(KERN_WARNING "%s: Wait for ready failed before probe !\n", hwif->name);
 758 #endif /* CONFIG_PPC */
 759
 760         /*
 761          * Second drive should only exist if first drive was found,
 762          * but a lot of cdrom drives are configured as single slaves.
 763          */
 764         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 765                 ide_drive_t *drive = &hwif->drives[unit];
 766                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 767                 (void) probe_for_drive(drive);
 768                 if (drive->present && !hwif->present) {
 769                         hwif->present = 1;
 770                         if (hwif->chipset != ide_4drives ||
 771                             !hwif->mate ||
 772                             !hwif->mate->present) {
 773                                 hwif_register(hwif);
 774                         }
 775                 }
 776         }
 777         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 778                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 779                 u8 stat;
 780
 781                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 782                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 783                 udelay(10);
 784                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 785                 do {
 786                         ide_delay_50ms();
 787                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 788                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 789
 790         }
 791         local_irq_restore(flags);
 792         /*
 793          * Use cached IRQ number. It might be (and is...) changed by probe
 794          * code above
 795          */
 796         if (irqd)
 797                 enable_irq(irqd);
 798
 799         if (!hwif->present) {
 800                 ide_hwif_release_regions(hwif);
 801                 return;
 802         }
 803
 804         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 805                 ide_drive_t *drive = &hwif->drives[unit];
 806                 int enable_dma = 1;
 807
 808                 if (drive->present) {
 809                         if (hwif->tuneproc != NULL &&
 810                                 drive->autotune == IDE_TUNE_AUTO)
 811                                 /* auto-tune PIO mode */
 812                                 hwif->tuneproc(drive, 255);
 813
 814 #ifdef CONFIG_IDEDMA_ONLYDISK
 815                         if (drive->media != ide_disk)
 816                                 enable_dma = 0;
 817 #endif
 818                         /*
 819                          * MAJOR HACK BARF :-/
 820                          *
 821                          * FIXME: chipsets own this cruft!
 822                          */
 823                         /*
 824                          * Move here to prevent module loading clashing.
 825                          */
 826         //              drive->autodma = hwif->autodma;
 827                         if ((hwif->ide_dma_check) &&
 828                                 ((drive->autotune == IDE_TUNE_DEFAULT) ||
 829                                 (drive->autotune == IDE_TUNE_AUTO))) {
 830                                 /*
 831                                  * Force DMAing for the beginning of the check.
 832                                  * Some chipsets appear to do interesting
 833                                  * things, if not checked and cleared.
 834                                  *   PARANOIA!!!
 835                                  */
 836                                 hwif->ide_dma_off_quietly(drive);
 837                                 if (enable_dma)
 838                                         hwif->ide_dma_check(drive);
 839                         }
 840                 }
 841         }
 842 }
 843
 844 EXPORT_SYMBOL(probe_hwif);
 845
 846 int hwif_init (ide_hwif_t *hwif);
 847 int probe_hwif_init (ide_hwif_t *hwif)
 848 {
 849         hwif->initializing = 1;
 850         probe_hwif(hwif);
 851         hwif_init(hwif);
 852
 853         if (hwif->present) {
 854                 u16 unit = 0;
 855                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 856                         ide_drive_t *drive = &hwif->drives[unit];
 857                         /* For now don't attach absent drives, we may
 858                            want them on default or a new "empty" class
 859                            for hotplug reprobing ? */
 860                         if (drive->present) {
 861                                 ata_attach(drive);
 862                         }
 863                 }
 864         }
 865         hwif->initializing = 0;
 866         return 0;
 867 }
 868
 869 EXPORT_SYMBOL(probe_hwif_init);
 870
 871 #if MAX_HWIFS > 1
 872 /*
 873  * save_match() is used to simplify logic in init_irq() below.
 874  *
 875  * A loophole here is that we may not know about a particular
 876  * hwif's irq until after that hwif is actually probed/initialized..
 877  * This could be a problem for the case where an hwif is on a
 878  * dual interface that requires serialization (eg. cmd640) and another
 879  * hwif using one of the same irqs is initialized beforehand.
 880  *
 881  * This routine detects and reports such situations, but does not fix them.
 882  */
 883 void save_match (ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 884 {
 885         ide_hwif_t *m = *match;
 886
 887         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 888                 if (!new->hwgroup)
 889                         return;
 890                 printk("%s: potential irq problem with %s and %s\n",
 891                         hwif->name, new->name, m->name);
 892         }
 893         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 894                 *match = new;
 895 }
 896 EXPORT_SYMBOL(save_match);
 897 #endif /* MAX_HWIFS > 1 */
 898
 899 /*
 900  * init request queue
 901  */
 902 static int ide_init_queue(ide_drive_t *drive)
 903 {
 904         request_queue_t *q;
 905         ide_hwif_t *hwif = HWIF(drive);
 906         int max_sectors = 256;
 907
 908         /*
 909          *      Our default set up assumes the normal IDE case,
 910          *      that is 64K segmenting, standard PRD setup
 911          *      and LBA28. Some drivers then impose their own
 912          *      limits and LBA48 we could raise it but as yet
 913          *      do not.
 914          */
 915
 916         q = blk_init_queue(do_ide_request, &ide_lock);
 917         if (!q)
 918                 return 1;
 919
 920         q->queuedata = HWGROUP(drive);
 921         blk_queue_segment_boundary(q, 0xffff);
 922
 923         if (!hwif->rqsize)
 924                 hwif->rqsize = hwif->no_lba48 ? 256 : 65536;
 925         if (hwif->rqsize < max_sectors)
 926                 max_sectors = hwif->rqsize;
 927         blk_queue_max_sectors(q, max_sectors);
 928
 929         /* IDE DMA can do PRD_ENTRIES number of segments. */
 930         blk_queue_max_hw_segments(q, PRD_ENTRIES);
 931
 932         /* This is a driver limit and could be eliminated. */
 933         blk_queue_max_phys_segments(q, PRD_ENTRIES);
 934
 935         /* assign drive and gendisk queue */
 936         drive->queue = q;
 937         if (drive->disk)
 938                 drive->disk->queue = drive->queue;
 939
 940         /* needs drive->queue to be set */
 941         ide_toggle_bounce(drive, 1);
 942
 943         /* enable led activity for disk drives only */
 944         if (drive->media == ide_disk && hwif->led_act)
 945                 blk_queue_activity_fn(q, hwif->led_act, drive);
 946
 947         return 0;
 948 }
 949
 950 /*
 951  * This routine sets up the irq for an ide interface, and creates a new
 952  * hwgroup for the irq/hwif if none was previously assigned.
 953  *
 954  * Much of the code is for correctly detecting/handling irq sharing
 955  * and irq serialization situations.  This is somewhat complex because
 956  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 957  *
 958  * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
 959  * interrupts completely disabled.  This can be bad for interrupt latency,
 960  * but anything else has led to problems on some machines.  We re-enable
 961  * interrupts as much as we can safely do in most places.
 962  */
 963 static int init_irq (ide_hwif_t *hwif)
 964 {
 965         unsigned int index;
 966         ide_hwgroup_t *hwgroup;
 967         ide_hwif_t *match = NULL;
 968
 969
 970         BUG_ON(in_interrupt());
 971         BUG_ON(irqs_disabled());
 972         down(&ide_cfg_sem);
 973         hwif->hwgroup = NULL;
 974 #if MAX_HWIFS > 1
 975         /*
 976          * Group up with any other hwifs that share our irq(s).
 977          */
 978         for (index = 0; index < MAX_HWIFS; index++) {
 979                 ide_hwif_t *h = &ide_hwifs[index];
 980                 if (h->hwgroup) {  /* scan only initialized hwif's */
 981                         if (hwif->irq == h->irq) {
 982                                 hwif->sharing_irq = h->sharing_irq = 1;
 983                                 if (hwif->chipset != ide_pci ||
 984                                     h->chipset != ide_pci) {
 985                                         save_match(hwif, h, &match);
 986                                 }
 987                         }
 988                         if (hwif->serialized) {
 989                                 if (hwif->mate && hwif->mate->irq == h->irq)
 990                                         save_match(hwif, h, &match);
 991                         }
 992                         if (h->serialized) {
 993                                 if (h->mate && hwif->irq == h->mate->irq)
 994                                         save_match(hwif, h, &match);
 995                         }
 996                 }
 997         }
 998 #endif /* MAX_HWIFS > 1 */
 999         /*
1000          * If we are still without a hwgroup, then form a new one
1001          */
1002         if (match) {
1003                 hwgroup = match->hwgroup;
1004                 hwif->hwgroup = hwgroup;
1005                 /*
1006                  * Link us into the hwgroup.
1007                  * This must be done early, do ensure that unexpected_intr
1008                  * can find the hwif and prevent irq storms.
1009                  * No drives are attached to the new hwif, choose_drive
1010                  * can't do anything stupid (yet).
1011                  * Add ourself as the 2nd entry to the hwgroup->hwif
1012                  * linked list, the first entry is the hwif that owns
1013                  * hwgroup->handler - do not change that.
1014                  */
1015                 spin_lock_irq(&ide_lock);
1016                 hwif->next = hwgroup->hwif->next;
1017                 hwgroup->hwif->next = hwif;
1018                 spin_unlock_irq(&ide_lock);
1019         } else {
1020                 hwgroup = kmalloc(sizeof(ide_hwgroup_t),GFP_KERNEL);
1021                 if (!hwgroup)
1022                         goto out_up;
1023
1024                 hwif->hwgroup = hwgroup;
1025
1026                 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1027                 hwgroup->hwif     = hwif->next = hwif;
1028                 hwgroup->rq       = NULL;
1029                 hwgroup->handler  = NULL;
1030                 hwgroup->drive    = NULL;
1031                 hwgroup->busy     = 0;
1032                 init_timer(&hwgroup->timer);
1033                 hwgroup->timer.function = &ide_timer_expiry;
1034                 hwgroup->timer.data = (unsigned long) hwgroup;
1035         }
1036
1037         /*
1038          * Allocate the irq, if not already obtained for another hwif
1039          */
1040         if (!match || match->irq != hwif->irq) {
1041                 int sa = SA_INTERRUPT;
1042 #if defined(__mc68000__) || defined(CONFIG_APUS)
1043                 sa = SA_SHIRQ;
1044 #endif /* __mc68000__ || CONFIG_APUS */
1045
1046                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1047                         sa = SA_SHIRQ;
1048 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1049                         sa |= SA_INTERRUPT;
1050 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1051                 }
1052
1053                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1054                         /* clear nIEN */
1055                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1056
1057                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1058                         goto out_unlink;
1059         }
1060
1061         /*
1062          * For any present drive:
1063          * - allocate the block device queue
1064          * - link drive into the hwgroup
1065          */
1066         for (index = 0; index < MAX_DRIVES; ++index) {
1067                 ide_drive_t *drive = &hwif->drives[index];
1068                 if (!drive->present)
1069                         continue;
1070                 if (ide_init_queue(drive)) {
1071                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1072                         continue;
1073                 }
1074                 spin_lock_irq(&ide_lock);
1075                 if (!hwgroup->drive) {
1076                         /* first drive for hwgroup. */
1077                         drive->next = drive;
1078                         hwgroup->drive = drive;
1079                         hwgroup->hwif = HWIF(hwgroup->drive);
1080                 } else {
1081                         drive->next = hwgroup->drive->next;
1082                         hwgroup->drive->next = drive;
1083                 }
1084                 spin_unlock_irq(&ide_lock);
1085         }
1086
1087 #if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
1088         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1089                 hwif->io_ports[IDE_DATA_OFFSET],
1090                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1091                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1092 #elif defined(__sparc__)
1093         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
1094                 hwif->io_ports[IDE_DATA_OFFSET],
1095                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1096                 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
1097 #else
1098         printk("%s at 0x%08lx on irq %d", hwif->name,
1099                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1100 #endif /* __mc68000__ && CONFIG_APUS */
1101         if (match)
1102                 printk(" (%sed with %s)",
1103                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1104         printk("\n");
1105         up(&ide_cfg_sem);
1106         return 0;
1107 out_unlink:
1108         spin_lock_irq(&ide_lock);
1109         if (hwif->next == hwif) {
1110                 BUG_ON(match);
1111                 BUG_ON(hwgroup->hwif != hwif);
1112                 kfree(hwgroup);
1113         } else {
1114                 ide_hwif_t *g;
1115                 g = hwgroup->hwif;
1116                 while (g->next != hwif)
1117                         g = g->next;
1118                 g->next = hwif->next;
1119                 if (hwgroup->hwif == hwif) {
1120                         /* Impossible. */
1121                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1122                         hwgroup->hwif = g;
1123                 }
1124                 BUG_ON(hwgroup->hwif == hwif);
1125         }
1126         spin_unlock_irq(&ide_lock);
1127 out_up:
1128         up(&ide_cfg_sem);
1129         return 1;
1130 }
1131
1132 static int ata_lock(dev_t dev, void *data)
1133 {
1134         /* FIXME: we want to pin hwif down */
1135         return 0;
1136 }
1137
1138 extern ide_driver_t idedefault_driver;
1139
1140 struct kobject *ata_probe(dev_t dev, int *part, void *data)
1141 {
1142         ide_hwif_t *hwif = data;
1143         int unit = *part >> PARTN_BITS;
1144         ide_drive_t *drive = &hwif->drives[unit];
1145         if (!drive->present)
1146                 return NULL;
1147         if (drive->driver == &idedefault_driver) {
1148                 if (drive->media == ide_disk)
1149                         (void) request_module("ide-disk");
1150                 if (drive->scsi)
1151                         (void) request_module("ide-scsi");
1152                 if (drive->media == ide_cdrom || drive->media == ide_optical)
1153                         (void) request_module("ide-cd");
1154                 if (drive->media == ide_tape)
1155                         (void) request_module("ide-tape");
1156                 if (drive->media == ide_floppy)
1157                         (void) request_module("ide-floppy");
1158         }
1159         if (drive->driver == &idedefault_driver)
1160                 return NULL;
1161         *part &= (1 << PARTN_BITS) - 1;
1162         return get_disk(drive->disk);
1163 }
1164
1165 static int alloc_disks(ide_hwif_t *hwif)
1166 {
1167         unsigned int unit;
1168         struct gendisk *disks[MAX_DRIVES];
1169
1170         for (unit = 0; unit < MAX_DRIVES; unit++) {
1171                 disks[unit] = alloc_disk(1 << PARTN_BITS);
1172                 if (!disks[unit])
1173                         goto Enomem;
1174         }
1175         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1176                 ide_drive_t *drive = &hwif->drives[unit];
1177                 struct gendisk *disk = disks[unit];
1178                 disk->major  = hwif->major;
1179                 disk->first_minor = unit << PARTN_BITS;
1180                 sprintf(disk->disk_name,"hd%c",'a'+hwif->index*MAX_DRIVES+unit);
1181                 disk->fops = ide_fops;
1182                 disk->private_data = drive;
1183                 drive->disk = disk;
1184         }
1185         return 0;
1186 Enomem:
1187         printk(KERN_WARNING "(ide::init_gendisk) Out of memory\n");
1188         while (unit--)
1189                 put_disk(disks[unit]);
1190         return -ENOMEM;
1191 }
1192
1193 static void drive_release_dev (struct device *dev)
1194 {
1195         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1196
1197         up(&drive->gendev_rel_sem);
1198 }
1199
1200 /*
1201  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1202  * after probing for drives, to allocate partition tables and other data
1203  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1204  * somewhat later, during the partition check.
1205  */
1206 static void init_gendisk (ide_hwif_t *hwif)
1207 {
1208         unsigned int unit;
1209
1210         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1211                 ide_drive_t * drive = &hwif->drives[unit];
1212                 ide_add_generic_settings(drive);
1213                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1214                          hwif->index,unit);
1215                 drive->gendev.parent = &hwif->gendev;
1216                 drive->gendev.bus = &ide_bus_type;
1217                 drive->gendev.driver_data = drive;
1218                 drive->gendev.release = drive_release_dev;
1219                 if (drive->present) {
1220                         device_register(&drive->gendev);
1221                         sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
1222                                 (hwif->channel && hwif->mate) ?
1223                                 hwif->mate->index : hwif->index,
1224                                 hwif->channel, unit, drive->lun);
1225                 }
1226         }
1227         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1228                         THIS_MODULE, ata_probe, ata_lock, hwif);
1229 }
1230
1231 EXPORT_SYMBOL(init_gendisk);
1232
1233 int hwif_init (ide_hwif_t *hwif)
1234 {
1235         int old_irq, unit;
1236
1237         if (!hwif->present)
1238                 return 0;
1239
1240         if (!hwif->irq) {
1241                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1242                 {
1243                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1244                         return (hwif->present = 0);
1245                 }
1246         }
1247 #ifdef CONFIG_BLK_DEV_HD
1248         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1249                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1250                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1251                 return (hwif->present = 0);
1252         }
1253 #endif /* CONFIG_BLK_DEV_HD */
1254
1255         /* we set it back to 1 if all is ok below */
1256         hwif->present = 0;
1257
1258         if (register_blkdev(hwif->major, hwif->name))
1259                 return 0;
1260
1261         if (alloc_disks(hwif) < 0)
1262                 goto out;
1263
1264         if (init_irq(hwif) == 0)
1265                 goto done;
1266
1267         old_irq = hwif->irq;
1268         /*
1269          *      It failed to initialise. Find the default IRQ for
1270          *      this port and try that.
1271          */
1272         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1273                 printk("%s: Disabled unable to get IRQ %d.\n",
1274                         hwif->name, old_irq);
1275                 goto out_disks;
1276         }
1277         if (init_irq(hwif)) {
1278                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1279                         hwif->name, old_irq, hwif->irq);
1280                 goto out_disks;
1281         }
1282         printk("%s: probed IRQ %d failed, using default.\n",
1283                 hwif->name, hwif->irq);
1284
1285 done:
1286         init_gendisk(hwif);
1287         hwif->present = 1;      /* success */
1288         return 1;
1289
1290 out_disks:
1291         for (unit = 0; unit < MAX_DRIVES; unit++) {
1292                 struct gendisk *disk = hwif->drives[unit].disk;
1293                 hwif->drives[unit].disk = NULL;
1294                 put_disk(disk);
1295         }
1296 out:
1297         unregister_blkdev(hwif->major, hwif->name);
1298         return 0;
1299 }
1300
1301 EXPORT_SYMBOL(hwif_init);
1302
1303 int ideprobe_init (void)
1304 {
1305         unsigned int index;
1306         int probe[MAX_HWIFS];
1307
1308         memset(probe, 0, MAX_HWIFS * sizeof(int));
1309         for (index = 0; index < MAX_HWIFS; ++index)
1310                 probe[index] = !ide_hwifs[index].present;
1311
1312         /*
1313          * Probe for drives in the usual way.. CMOS/BIOS, then poke at ports
1314          */
1315         for (index = 0; index < MAX_HWIFS; ++index)
1316                 if (probe[index])
1317                         probe_hwif(&ide_hwifs[index]);
1318         for (index = 0; index < MAX_HWIFS; ++index)
1319                 if (probe[index])
1320                         hwif_init(&ide_hwifs[index]);
1321         for (index = 0; index < MAX_HWIFS; ++index) {
1322                 if (probe[index]) {
1323                         ide_hwif_t *hwif = &ide_hwifs[index];
1324                         int unit;
1325                         if (!hwif->present)
1326                                 continue;
1327                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1328                                 hwif->chipset = ide_generic;
1329                         for (unit = 0; unit < MAX_DRIVES; ++unit)
1330                                 if (hwif->drives[unit].present)
1331                                         ata_attach(&hwif->drives[unit]);
1332                 }
1333         }
1334         return 0;
1335 }
1336
1337 EXPORT_SYMBOL_GPL(ideprobe_init);