git.oblomov.eu Git - linux-2.6/blob - drivers/ide/ide-probe.c

   1 /*
   2  *  Copyright (C) 1994-1998   Linus Torvalds & authors (see below)
   3  *  Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  *  Mostly written by Mark Lord <mlord@pobox.com>
   8  *                and Gadi Oxman <gadio@netvision.net.il>
   9  *                and Andre Hedrick <andre@linux-ide.org>
  10  *
  11  *  See linux/MAINTAINERS for address of current maintainer.
  12  *
  13  * This is the IDE probe module, as evolved from hd.c and ide.c.
  14  *
  15  * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  16  *       by Andrea Arcangeli
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22 #include <linux/kernel.h>
  23 #include <linux/timer.h>
  24 #include <linux/mm.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/major.h>
  27 #include <linux/errno.h>
  28 #include <linux/genhd.h>
  29 #include <linux/slab.h>
  30 #include <linux/delay.h>
  31 #include <linux/ide.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/kmod.h>
  34 #include <linux/pci.h>
  35 #include <linux/scatterlist.h>
  36
  37 #include <asm/byteorder.h>
  38 #include <asm/irq.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/io.h>
  41
  42 /**
  43  *      generic_id              -       add a generic drive id
  44  *      @drive: drive to make an ID block for
  45  *
  46  *      Add a fake id field to the drive we are passed. This allows
  47  *      use to skip a ton of NULL checks (which people always miss)
  48  *      and make drive properties unconditional outside of this file
  49  */
  50
  51 static void generic_id(ide_drive_t *drive)
  52 {
  53         drive->id->cyls = drive->cyl;
  54         drive->id->heads = drive->head;
  55         drive->id->sectors = drive->sect;
  56         drive->id->cur_cyls = drive->cyl;
  57         drive->id->cur_heads = drive->head;
  58         drive->id->cur_sectors = drive->sect;
  59 }
  60
  61 static void ide_disk_init_chs(ide_drive_t *drive)
  62 {
  63         struct hd_driveid *id = drive->id;
  64
  65         /* Extract geometry if we did not already have one for the drive */
  66         if (!drive->cyl || !drive->head || !drive->sect) {
  67                 drive->cyl  = drive->bios_cyl  = id->cyls;
  68                 drive->head = drive->bios_head = id->heads;
  69                 drive->sect = drive->bios_sect = id->sectors;
  70         }
  71
  72         /* Handle logical geometry translation by the drive */
  73         if ((id->field_valid & 1) && id->cur_cyls &&
  74             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
  75                 drive->cyl  = id->cur_cyls;
  76                 drive->head = id->cur_heads;
  77                 drive->sect = id->cur_sectors;
  78         }
  79
  80         /* Use physical geometry if what we have still makes no sense */
  81         if (drive->head > 16 && id->heads && id->heads <= 16) {
  82                 drive->cyl  = id->cyls;
  83                 drive->head = id->heads;
  84                 drive->sect = id->sectors;
  85         }
  86 }
  87
  88 static void ide_disk_init_mult_count(ide_drive_t *drive)
  89 {
  90         struct hd_driveid *id = drive->id;
  91
  92         drive->mult_count = 0;
  93         if (id->max_multsect) {
  94 #ifdef CONFIG_IDEDISK_MULTI_MODE
  95                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
  96                 id->multsect_valid = id->multsect ? 1 : 0;
  97                 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
  98                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
  99 #else   /* original, pre IDE-NFG, per request of AC */
 100                 drive->mult_req = 0;
 101                 if (drive->mult_req > id->max_multsect)
 102                         drive->mult_req = id->max_multsect;
 103                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
 104                         drive->special.b.set_multmode = 1;
 105 #endif
 106         }
 107 }
 108
 109 /**
 110  *      do_identify     -       identify a drive
 111  *      @drive: drive to identify
 112  *      @cmd: command used
 113  *
 114  *      Called when we have issued a drive identify command to
 115  *      read and parse the results. This function is run with
 116  *      interrupts disabled.
 117  */
 118
 119 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 120 {
 121         ide_hwif_t *hwif = HWIF(drive);
 122         int bswap = 1;
 123         struct hd_driveid *id;
 124
 125         id = drive->id;
 126         /* read 512 bytes of id info */
 127         hwif->ata_input_data(drive, id, SECTOR_WORDS);
 128
 129         drive->id_read = 1;
 130         local_irq_enable();
 131 #ifdef DEBUG
 132         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 133         ide_dump_identify((u8 *)id);
 134 #endif
 135         ide_fix_driveid(id);
 136
 137 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 138         /*
 139          * EATA SCSI controllers do a hardware ATA emulation:
 140          * Ignore them if there is a driver for them available.
 141          */
 142         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 143             (id->model[0] == 'S' && id->model[1] == 'K')) {
 144                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 145                 goto err_misc;
 146         }
 147 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
 148
 149         /*
 150          *  WIN_IDENTIFY returns little-endian info,
 151          *  WIN_PIDENTIFY *usually* returns little-endian info.
 152          */
 153         if (cmd == WIN_PIDENTIFY) {
 154                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 155                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 156                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 157                         /* Vertos drives may still be weird */
 158                         bswap ^= 1;
 159         }
 160         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 161         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 162         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 163
 164         /* we depend on this a lot! */
 165         id->model[sizeof(id->model)-1] = '\0';
 166
 167         if (strstr(id->model, "E X A B Y T E N E S T"))
 168                 goto err_misc;
 169
 170         printk("%s: %s, ", drive->name, id->model);
 171         drive->present = 1;
 172         drive->dead = 0;
 173
 174         /*
 175          * Check for an ATAPI device
 176          */
 177         if (cmd == WIN_PIDENTIFY) {
 178                 u8 type = (id->config >> 8) & 0x1f;
 179                 printk("ATAPI ");
 180                 switch (type) {
 181                         case ide_floppy:
 182                                 if (!strstr(id->model, "CD-ROM")) {
 183                                         if (!strstr(id->model, "oppy") &&
 184                                             !strstr(id->model, "poyp") &&
 185                                             !strstr(id->model, "ZIP"))
 186                                                 printk("cdrom or floppy?, assuming ");
 187                                         if (drive->media != ide_cdrom) {
 188                                                 printk ("FLOPPY");
 189                                                 drive->removable = 1;
 190                                                 break;
 191                                         }
 192                                 }
 193                                 /* Early cdrom models used zero */
 194                                 type = ide_cdrom;
 195                         case ide_cdrom:
 196                                 drive->removable = 1;
 197 #ifdef CONFIG_PPC
 198                                 /* kludge for Apple PowerBook internal zip */
 199                                 if (!strstr(id->model, "CD-ROM") &&
 200                                     strstr(id->model, "ZIP")) {
 201                                         printk ("FLOPPY");
 202                                         type = ide_floppy;
 203                                         break;
 204                                 }
 205 #endif
 206                                 printk ("CD/DVD-ROM");
 207                                 break;
 208                         case ide_tape:
 209                                 printk ("TAPE");
 210                                 break;
 211                         case ide_optical:
 212                                 printk ("OPTICAL");
 213                                 drive->removable = 1;
 214                                 break;
 215                         default:
 216                                 printk("UNKNOWN (type %d)", type);
 217                                 break;
 218                 }
 219                 printk (" drive\n");
 220                 drive->media = type;
 221                 /* an ATAPI device ignores DRDY */
 222                 drive->ready_stat = 0;
 223                 return;
 224         }
 225
 226         /*
 227          * Not an ATAPI device: looks like a "regular" hard disk
 228          */
 229
 230         /*
 231          * 0x848a = CompactFlash device
 232          * These are *not* removable in Linux definition of the term
 233          */
 234
 235         if ((id->config != 0x848a) && (id->config & (1<<7)))
 236                 drive->removable = 1;
 237
 238         drive->media = ide_disk;
 239         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
 240
 241         return;
 242
 243 err_misc:
 244         kfree(id);
 245         drive->present = 0;
 246         return;
 247 }
 248
 249 /**
 250  *      actual_try_to_identify  -       send ata/atapi identify
 251  *      @drive: drive to identify
 252  *      @cmd: command to use
 253  *
 254  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 255  *      and waits for a response.  It also monitors irqs while this is
 256  *      happening, in hope of automatically determining which one is
 257  *      being used by the interface.
 258  *
 259  *      Returns:        0  device was identified
 260  *                      1  device timed-out (no response to identify request)
 261  *                      2  device aborted the command (refused to identify itself)
 262  */
 263
 264 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 265 {
 266         ide_hwif_t *hwif = HWIF(drive);
 267         int rc;
 268         unsigned long hd_status;
 269         unsigned long timeout;
 270         u8 s = 0, a = 0;
 271
 272         /* take a deep breath */
 273         msleep(50);
 274
 275         if (IDE_CONTROL_REG) {
 276                 a = hwif->INB(IDE_ALTSTATUS_REG);
 277                 s = hwif->INB(IDE_STATUS_REG);
 278                 if ((a ^ s) & ~INDEX_STAT) {
 279                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 280                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 281                         /* ancient Seagate drives, broken interfaces */
 282                         hd_status = IDE_STATUS_REG;
 283                 } else {
 284                         /* use non-intrusive polling */
 285                         hd_status = IDE_ALTSTATUS_REG;
 286                 }
 287         } else
 288                 hd_status = IDE_STATUS_REG;
 289
 290         /* set features register for atapi
 291          * identify command to be sure of reply
 292          */
 293         if ((cmd == WIN_PIDENTIFY))
 294                 /* disable dma & overlap */
 295                 hwif->OUTB(0, IDE_FEATURE_REG);
 296
 297         /* ask drive for ID */
 298         hwif->OUTB(cmd, IDE_COMMAND_REG);
 299
 300         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 301         timeout += jiffies;
 302         do {
 303                 if (time_after(jiffies, timeout)) {
 304                         /* drive timed-out */
 305                         return 1;
 306                 }
 307                 /* give drive a breather */
 308                 msleep(50);
 309         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 310
 311         /* wait for IRQ and DRQ_STAT */
 312         msleep(50);
 313         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 314                 unsigned long flags;
 315
 316                 /* local CPU only; some systems need this */
 317                 local_irq_save(flags);
 318                 /* drive returned ID */
 319                 do_identify(drive, cmd);
 320                 /* drive responded with ID */
 321                 rc = 0;
 322                 /* clear drive IRQ */
 323                 (void) hwif->INB(IDE_STATUS_REG);
 324                 local_irq_restore(flags);
 325         } else {
 326                 /* drive refused ID */
 327                 rc = 2;
 328         }
 329         return rc;
 330 }
 331
 332 /**
 333  *      try_to_identify -       try to identify a drive
 334  *      @drive: drive to probe
 335  *      @cmd: command to use
 336  *
 337  *      Issue the identify command and then do IRQ probing to
 338  *      complete the identification when needed by finding the
 339  *      IRQ the drive is attached to
 340  */
 341
 342 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 343 {
 344         ide_hwif_t *hwif = HWIF(drive);
 345         int retval;
 346         int autoprobe = 0;
 347         unsigned long cookie = 0;
 348
 349         /*
 350          * Disable device irq unless we need to
 351          * probe for it. Otherwise we'll get spurious
 352          * interrupts during the identify-phase that
 353          * the irq handler isn't expecting.
 354          */
 355         if (IDE_CONTROL_REG) {
 356                 if (!hwif->irq) {
 357                         autoprobe = 1;
 358                         cookie = probe_irq_on();
 359                 }
 360                 ide_set_irq(drive, autoprobe);
 361         }
 362
 363         retval = actual_try_to_identify(drive, cmd);
 364
 365         if (autoprobe) {
 366                 int irq;
 367
 368                 ide_set_irq(drive, 0);
 369                 /* clear drive IRQ */
 370                 (void) hwif->INB(IDE_STATUS_REG);
 371                 udelay(5);
 372                 irq = probe_irq_off(cookie);
 373                 if (!hwif->irq) {
 374                         if (irq > 0) {
 375                                 hwif->irq = irq;
 376                         } else {
 377                                 /* Mmmm.. multiple IRQs..
 378                                  * don't know which was ours
 379                                  */
 380                                 printk("%s: IRQ probe failed (0x%lx)\n",
 381                                         drive->name, cookie);
 382                         }
 383                 }
 384         }
 385         return retval;
 386 }
 387
 388 static int ide_busy_sleep(ide_hwif_t *hwif)
 389 {
 390         unsigned long timeout = jiffies + WAIT_WORSTCASE;
 391         u8 stat;
 392
 393         do {
 394                 msleep(50);
 395                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 396                 if ((stat & BUSY_STAT) == 0)
 397                         return 0;
 398         } while (time_before(jiffies, timeout));
 399
 400         return 1;
 401 }
 402
 403 /**
 404  *      do_probe                -       probe an IDE device
 405  *      @drive: drive to probe
 406  *      @cmd: command to use
 407  *
 408  *      do_probe() has the difficult job of finding a drive if it exists,
 409  *      without getting hung up if it doesn't exist, without trampling on
 410  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 411  *
 412  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 413  *      but does not respond right away, the probe will "hang in there"
 414  *      for the maximum wait time (about 30 seconds), otherwise it will
 415  *      exit much more quickly.
 416  *
 417  * Returns:     0  device was identified
 418  *              1  device timed-out (no response to identify request)
 419  *              2  device aborted the command (refused to identify itself)
 420  *              3  bad status from device (possible for ATAPI drives)
 421  *              4  probe was not attempted because failure was obvious
 422  */
 423
 424 static int do_probe (ide_drive_t *drive, u8 cmd)
 425 {
 426         int rc;
 427         ide_hwif_t *hwif = HWIF(drive);
 428
 429         if (drive->present) {
 430                 /* avoid waiting for inappropriate probes */
 431                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 432                         return 4;
 433         }
 434 #ifdef DEBUG
 435         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 436                 drive->name, drive->present, drive->media,
 437                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 438 #endif
 439
 440         /* needed for some systems
 441          * (e.g. crw9624 as drive0 with disk as slave)
 442          */
 443         msleep(50);
 444         SELECT_DRIVE(drive);
 445         msleep(50);
 446         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 447                 if (drive->select.b.unit != 0) {
 448                         /* exit with drive0 selected */
 449                         SELECT_DRIVE(&hwif->drives[0]);
 450                         /* allow BUSY_STAT to assert & clear */
 451                         msleep(50);
 452                 }
 453                 /* no i/f present: mmm.. this should be a 4 -ml */
 454                 return 3;
 455         }
 456
 457         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 458             drive->present || cmd == WIN_PIDENTIFY) {
 459                 /* send cmd and wait */
 460                 if ((rc = try_to_identify(drive, cmd))) {
 461                         /* failed: try again */
 462                         rc = try_to_identify(drive,cmd);
 463                 }
 464                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 465                         return 4;
 466
 467                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 468                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 469                         (drive->autotune == IDE_TUNE_AUTO))) {
 470                         printk("%s: no response (status = 0x%02x), "
 471                                 "resetting drive\n", drive->name,
 472                                 hwif->INB(IDE_STATUS_REG));
 473                         msleep(50);
 474                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 475                         msleep(50);
 476                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 477                         (void)ide_busy_sleep(hwif);
 478                         rc = try_to_identify(drive, cmd);
 479                 }
 480                 if (rc == 1)
 481                         printk("%s: no response (status = 0x%02x)\n",
 482                                 drive->name, hwif->INB(IDE_STATUS_REG));
 483                 /* ensure drive irq is clear */
 484                 (void) hwif->INB(IDE_STATUS_REG);
 485         } else {
 486                 /* not present or maybe ATAPI */
 487                 rc = 3;
 488         }
 489         if (drive->select.b.unit != 0) {
 490                 /* exit with drive0 selected */
 491                 SELECT_DRIVE(&hwif->drives[0]);
 492                 msleep(50);
 493                 /* ensure drive irq is clear */
 494                 (void) hwif->INB(IDE_STATUS_REG);
 495         }
 496         return rc;
 497 }
 498
 499 /*
 500  *
 501  */
 502 static void enable_nest (ide_drive_t *drive)
 503 {
 504         ide_hwif_t *hwif = HWIF(drive);
 505
 506         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 507         SELECT_DRIVE(drive);
 508         msleep(50);
 509         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 510
 511         if (ide_busy_sleep(hwif)) {
 512                 printk(KERN_CONT "failed (timeout)\n");
 513                 return;
 514         }
 515
 516         msleep(50);
 517
 518         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 519                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 520         } else {
 521                 printk("success\n");
 522         }
 523
 524         /* if !(success||timed-out) */
 525         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 526                 /* look for ATAPI device */
 527                 (void) do_probe(drive, WIN_PIDENTIFY);
 528         }
 529 }
 530
 531 /**
 532  *      probe_for_drives        -       upper level drive probe
 533  *      @drive: drive to probe for
 534  *
 535  *      probe_for_drive() tests for existence of a given drive using do_probe()
 536  *      and presents things to the user as needed.
 537  *
 538  *      Returns:        0  no device was found
 539  *                      1  device was found (note: drive->present might
 540  *                         still be 0)
 541  */
 542
 543 static inline u8 probe_for_drive (ide_drive_t *drive)
 544 {
 545         /*
 546          *      In order to keep things simple we have an id
 547          *      block for all drives at all times. If the device
 548          *      is pre ATA or refuses ATA/ATAPI identify we
 549          *      will add faked data to this.
 550          *
 551          *      Also note that 0 everywhere means "can't do X"
 552          */
 553
 554         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 555         drive->id_read = 0;
 556         if(drive->id == NULL)
 557         {
 558                 printk(KERN_ERR "ide: out of memory for id data.\n");
 559                 return 0;
 560         }
 561         strcpy(drive->id->model, "UNKNOWN");
 562
 563         /* skip probing? */
 564         if (!drive->noprobe)
 565         {
 566                 /* if !(success||timed-out) */
 567                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 568                         /* look for ATAPI device */
 569                         (void) do_probe(drive, WIN_PIDENTIFY);
 570                 }
 571                 if (!drive->present)
 572                         /* drive not found */
 573                         return 0;
 574                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 575                         enable_nest(drive);
 576
 577                 /* identification failed? */
 578                 if (!drive->id_read) {
 579                         if (drive->media == ide_disk) {
 580                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 581                                         drive->name, drive->cyl,
 582                                         drive->head, drive->sect);
 583                         } else if (drive->media == ide_cdrom) {
 584                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 585                         } else {
 586                                 /* nuke it */
 587                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 588                                 drive->present = 0;
 589                         }
 590                 }
 591                 /* drive was found */
 592         }
 593         if(!drive->present)
 594                 return 0;
 595         /* The drive wasn't being helpful. Add generic info only */
 596         if (drive->id_read == 0) {
 597                 generic_id(drive);
 598                 return 1;
 599         }
 600
 601         if (drive->media == ide_disk) {
 602                 ide_disk_init_chs(drive);
 603                 ide_disk_init_mult_count(drive);
 604         }
 605
 606         return drive->present;
 607 }
 608
 609 static void hwif_release_dev (struct device *dev)
 610 {
 611         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 612
 613         complete(&hwif->gendev_rel_comp);
 614 }
 615
 616 static void ide_register_port(ide_hwif_t *hwif)
 617 {
 618         int ret;
 619
 620         /* register with global device tree */
 621         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 622         hwif->gendev.driver_data = hwif;
 623         if (hwif->gendev.parent == NULL) {
 624                 if (hwif->dev)
 625                         hwif->gendev.parent = hwif->dev;
 626                 else
 627                         /* Would like to do = &device_legacy */
 628                         hwif->gendev.parent = NULL;
 629         }
 630         hwif->gendev.release = hwif_release_dev;
 631         ret = device_register(&hwif->gendev);
 632         if (ret < 0)
 633                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 634                         __FUNCTION__, ret);
 635 }
 636
 637 /**
 638  *      ide_port_wait_ready     -       wait for port to become ready
 639  *      @hwif: IDE port
 640  *
 641  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 642  *      platforms.  Typical cases are:
 643  *
 644  *      - The firmware hard reset the disk before booting the kernel,
 645  *        the drive is still doing it's poweron-reset sequence, that
 646  *        can take up to 30 seconds.
 647  *
 648  *      - The firmware does nothing (or no firmware), the device is
 649  *        still in POST state (same as above actually).
 650  *
 651  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 652  *        their reset sequence even when they are non-selected slave
 653  *        devices, thus preventing discovery of the main HD.
 654  *
 655  *      Doing this wait-for-non-busy should not harm any existing
 656  *      configuration and fix some issues like the above.
 657  *
 658  *      BenH.
 659  *
 660  *      Returns 0 on success, error code (< 0) otherwise.
 661  */
 662
 663 static int ide_port_wait_ready(ide_hwif_t *hwif)
 664 {
 665         int unit, rc;
 666
 667         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 668
 669         /* Let HW settle down a bit from whatever init state we
 670          * come from */
 671         mdelay(2);
 672
 673         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 674          * I know of at least one disk who takes 31 seconds, I use 35
 675          * here to be safe
 676          */
 677         rc = ide_wait_not_busy(hwif, 35000);
 678         if (rc)
 679                 return rc;
 680
 681         /* Now make sure both master & slave are ready */
 682         for (unit = 0; unit < MAX_DRIVES; unit++) {
 683                 ide_drive_t *drive = &hwif->drives[unit];
 684
 685                 /* Ignore disks that we will not probe for later. */
 686                 if (!drive->noprobe || drive->present) {
 687                         SELECT_DRIVE(drive);
 688                         ide_set_irq(drive, 1);
 689                         mdelay(2);
 690                         rc = ide_wait_not_busy(hwif, 35000);
 691                         if (rc)
 692                                 goto out;
 693                 } else
 694                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 695                                           drive->name);
 696         }
 697 out:
 698         /* Exit function with master reselected (let's be sane) */
 699         if (unit)
 700                 SELECT_DRIVE(&hwif->drives[0]);
 701
 702         return rc;
 703 }
 704
 705 /**
 706  *      ide_undecoded_slave     -       look for bad CF adapters
 707  *      @drive1: drive
 708  *
 709  *      Analyse the drives on the interface and attempt to decide if we
 710  *      have the same drive viewed twice. This occurs with crap CF adapters
 711  *      and PCMCIA sometimes.
 712  */
 713
 714 void ide_undecoded_slave(ide_drive_t *drive1)
 715 {
 716         ide_drive_t *drive0 = &drive1->hwif->drives[0];
 717
 718         if ((drive1->dn & 1) == 0 || drive0->present == 0)
 719                 return;
 720
 721         /* If the models don't match they are not the same product */
 722         if (strcmp(drive0->id->model, drive1->id->model))
 723                 return;
 724
 725         /* Serial numbers do not match */
 726         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 727                 return;
 728
 729         /* No serial number, thankfully very rare for CF */
 730         if (drive0->id->serial_no[0] == 0)
 731                 return;
 732
 733         /* Appears to be an IDE flash adapter with decode bugs */
 734         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 735
 736         drive1->present = 0;
 737 }
 738
 739 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 740
 741 static int ide_probe_port(ide_hwif_t *hwif)
 742 {
 743         unsigned long flags;
 744         unsigned int irqd;
 745         int unit, rc = -ENODEV;
 746
 747         BUG_ON(hwif->present);
 748
 749         if (hwif->noprobe)
 750                 return -EACCES;
 751
 752         /*
 753          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 754          * we'll install our IRQ driver much later...
 755          */
 756         irqd = hwif->irq;
 757         if (irqd)
 758                 disable_irq(hwif->irq);
 759
 760         local_irq_set(flags);
 761
 762         if (ide_port_wait_ready(hwif) == -EBUSY)
 763                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 764
 765         /*
 766          * Need to probe slave device first to make it release PDIAG-.
 767          */
 768         for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
 769                 ide_drive_t *drive = &hwif->drives[unit];
 770                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 771                 (void) probe_for_drive(drive);
 772                 if (drive->present)
 773                         rc = 0;
 774         }
 775         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 776                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 777                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 778                 udelay(10);
 779                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 780                 (void)ide_busy_sleep(hwif);
 781         }
 782         local_irq_restore(flags);
 783         /*
 784          * Use cached IRQ number. It might be (and is...) changed by probe
 785          * code above
 786          */
 787         if (irqd)
 788                 enable_irq(irqd);
 789
 790         return rc;
 791 }
 792
 793 static void ide_port_tune_devices(ide_hwif_t *hwif)
 794 {
 795         int unit;
 796
 797         for (unit = 0; unit < MAX_DRIVES; unit++) {
 798                 ide_drive_t *drive = &hwif->drives[unit];
 799
 800                 if (drive->present && hwif->quirkproc)
 801                         hwif->quirkproc(drive);
 802         }
 803
 804         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 805                 ide_drive_t *drive = &hwif->drives[unit];
 806
 807                 if (drive->present) {
 808                         if (drive->autotune == IDE_TUNE_AUTO)
 809                                 ide_set_max_pio(drive);
 810
 811                         if (drive->autotune != IDE_TUNE_DEFAULT &&
 812                             drive->autotune != IDE_TUNE_AUTO)
 813                                 continue;
 814
 815                         drive->nice1 = 1;
 816
 817                         if (hwif->dma_host_set)
 818                                 ide_set_dma(drive);
 819                 }
 820         }
 821
 822         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 823                 ide_drive_t *drive = &hwif->drives[unit];
 824
 825                 if (hwif->no_io_32bit)
 826                         drive->no_io_32bit = 1;
 827                 else
 828                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 829         }
 830 }
 831
 832 #if MAX_HWIFS > 1
 833 /*
 834  * save_match() is used to simplify logic in init_irq() below.
 835  *
 836  * A loophole here is that we may not know about a particular
 837  * hwif's irq until after that hwif is actually probed/initialized..
 838  * This could be a problem for the case where an hwif is on a
 839  * dual interface that requires serialization (eg. cmd640) and another
 840  * hwif using one of the same irqs is initialized beforehand.
 841  *
 842  * This routine detects and reports such situations, but does not fix them.
 843  */
 844 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 845 {
 846         ide_hwif_t *m = *match;
 847
 848         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 849                 if (!new->hwgroup)
 850                         return;
 851                 printk("%s: potential irq problem with %s and %s\n",
 852                         hwif->name, new->name, m->name);
 853         }
 854         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 855                 *match = new;
 856 }
 857 #endif /* MAX_HWIFS > 1 */
 858
 859 /*
 860  * init request queue
 861  */
 862 static int ide_init_queue(ide_drive_t *drive)
 863 {
 864         struct request_queue *q;
 865         ide_hwif_t *hwif = HWIF(drive);
 866         int max_sectors = 256;
 867         int max_sg_entries = PRD_ENTRIES;
 868
 869         /*
 870          *      Our default set up assumes the normal IDE case,
 871          *      that is 64K segmenting, standard PRD setup
 872          *      and LBA28. Some drivers then impose their own
 873          *      limits and LBA48 we could raise it but as yet
 874          *      do not.
 875          */
 876
 877         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 878         if (!q)
 879                 return 1;
 880
 881         q->queuedata = drive;
 882         blk_queue_segment_boundary(q, 0xffff);
 883
 884         if (!hwif->rqsize) {
 885                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
 886                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
 887                         hwif->rqsize = 256;
 888                 else
 889                         hwif->rqsize = 65536;
 890         }
 891         if (hwif->rqsize < max_sectors)
 892                 max_sectors = hwif->rqsize;
 893         blk_queue_max_sectors(q, max_sectors);
 894
 895 #ifdef CONFIG_PCI
 896         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 897          * creates segments that don't completely match our boundary
 898          * requirements and thus need to be broken up again. Because it
 899          * doesn't align properly either, we may actually have to break up
 900          * to more segments than what was we got in the first place, a max
 901          * worst case is twice as many.
 902          * This will be fixed once we teach pci_map_sg() about our boundary
 903          * requirements, hopefully soon. *FIXME*
 904          */
 905         if (!PCI_DMA_BUS_IS_PHYS)
 906                 max_sg_entries >>= 1;
 907 #endif /* CONFIG_PCI */
 908
 909         blk_queue_max_hw_segments(q, max_sg_entries);
 910         blk_queue_max_phys_segments(q, max_sg_entries);
 911
 912         /* assign drive queue */
 913         drive->queue = q;
 914
 915         /* needs drive->queue to be set */
 916         ide_toggle_bounce(drive, 1);
 917
 918         return 0;
 919 }
 920
 921 /*
 922  * This routine sets up the irq for an ide interface, and creates a new
 923  * hwgroup for the irq/hwif if none was previously assigned.
 924  *
 925  * Much of the code is for correctly detecting/handling irq sharing
 926  * and irq serialization situations.  This is somewhat complex because
 927  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 928  */
 929 static int init_irq (ide_hwif_t *hwif)
 930 {
 931         unsigned int index;
 932         ide_hwgroup_t *hwgroup;
 933         ide_hwif_t *match = NULL;
 934
 935
 936         BUG_ON(in_interrupt());
 937         BUG_ON(irqs_disabled());
 938         BUG_ON(hwif == NULL);
 939
 940         mutex_lock(&ide_cfg_mtx);
 941         hwif->hwgroup = NULL;
 942 #if MAX_HWIFS > 1
 943         /*
 944          * Group up with any other hwifs that share our irq(s).
 945          */
 946         for (index = 0; index < MAX_HWIFS; index++) {
 947                 ide_hwif_t *h = &ide_hwifs[index];
 948                 if (h->hwgroup) {  /* scan only initialized hwif's */
 949                         if (hwif->irq == h->irq) {
 950                                 hwif->sharing_irq = h->sharing_irq = 1;
 951                                 if (hwif->chipset != ide_pci ||
 952                                     h->chipset != ide_pci) {
 953                                         save_match(hwif, h, &match);
 954                                 }
 955                         }
 956                         if (hwif->serialized) {
 957                                 if (hwif->mate && hwif->mate->irq == h->irq)
 958                                         save_match(hwif, h, &match);
 959                         }
 960                         if (h->serialized) {
 961                                 if (h->mate && hwif->irq == h->mate->irq)
 962                                         save_match(hwif, h, &match);
 963                         }
 964                 }
 965         }
 966 #endif /* MAX_HWIFS > 1 */
 967         /*
 968          * If we are still without a hwgroup, then form a new one
 969          */
 970         if (match) {
 971                 hwgroup = match->hwgroup;
 972                 hwif->hwgroup = hwgroup;
 973                 /*
 974                  * Link us into the hwgroup.
 975                  * This must be done early, do ensure that unexpected_intr
 976                  * can find the hwif and prevent irq storms.
 977                  * No drives are attached to the new hwif, choose_drive
 978                  * can't do anything stupid (yet).
 979                  * Add ourself as the 2nd entry to the hwgroup->hwif
 980                  * linked list, the first entry is the hwif that owns
 981                  * hwgroup->handler - do not change that.
 982                  */
 983                 spin_lock_irq(&ide_lock);
 984                 hwif->next = hwgroup->hwif->next;
 985                 hwgroup->hwif->next = hwif;
 986                 BUG_ON(hwif->next == hwif);
 987                 spin_unlock_irq(&ide_lock);
 988         } else {
 989                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
 990                                        hwif_to_node(hwif));
 991                 if (hwgroup == NULL)
 992                         goto out_up;
 993
 994                 hwif->hwgroup = hwgroup;
 995                 hwgroup->hwif = hwif->next = hwif;
 996
 997                 init_timer(&hwgroup->timer);
 998                 hwgroup->timer.function = &ide_timer_expiry;
 999                 hwgroup->timer.data = (unsigned long) hwgroup;
1000         }
1001
1002         /*
1003          * Allocate the irq, if not already obtained for another hwif
1004          */
1005         if (!match || match->irq != hwif->irq) {
1006                 int sa = 0;
1007 #if defined(__mc68000__) || defined(CONFIG_APUS)
1008                 sa = IRQF_SHARED;
1009 #endif /* __mc68000__ || CONFIG_APUS */
1010
1011                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1012                         sa = IRQF_SHARED;
1013
1014                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1015                         /* clear nIEN */
1016                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1017
1018                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1019                         goto out_unlink;
1020         }
1021
1022         /*
1023          * For any present drive:
1024          * - allocate the block device queue
1025          * - link drive into the hwgroup
1026          */
1027         for (index = 0; index < MAX_DRIVES; ++index) {
1028                 ide_drive_t *drive = &hwif->drives[index];
1029                 if (!drive->present)
1030                         continue;
1031                 if (ide_init_queue(drive)) {
1032                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1033                         continue;
1034                 }
1035                 spin_lock_irq(&ide_lock);
1036                 if (!hwgroup->drive) {
1037                         /* first drive for hwgroup. */
1038                         drive->next = drive;
1039                         hwgroup->drive = drive;
1040                         hwgroup->hwif = HWIF(hwgroup->drive);
1041                 } else {
1042                         drive->next = hwgroup->drive->next;
1043                         hwgroup->drive->next = drive;
1044                 }
1045                 spin_unlock_irq(&ide_lock);
1046         }
1047
1048 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1049         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1050                 hwif->io_ports[IDE_DATA_OFFSET],
1051                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1052                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1053 #else
1054         printk("%s at 0x%08lx on irq %d", hwif->name,
1055                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1056 #endif /* __mc68000__ && CONFIG_APUS */
1057         if (match)
1058                 printk(" (%sed with %s)",
1059                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1060         printk("\n");
1061         mutex_unlock(&ide_cfg_mtx);
1062         return 0;
1063 out_unlink:
1064         ide_remove_port_from_hwgroup(hwif);
1065 out_up:
1066         mutex_unlock(&ide_cfg_mtx);
1067         return 1;
1068 }
1069
1070 static int ata_lock(dev_t dev, void *data)
1071 {
1072         /* FIXME: we want to pin hwif down */
1073         return 0;
1074 }
1075
1076 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1077 {
1078         ide_hwif_t *hwif = data;
1079         int unit = *part >> PARTN_BITS;
1080         ide_drive_t *drive = &hwif->drives[unit];
1081         if (!drive->present)
1082                 return NULL;
1083
1084         if (drive->media == ide_disk)
1085                 request_module("ide-disk");
1086         if (drive->scsi)
1087                 request_module("ide-scsi");
1088         if (drive->media == ide_cdrom || drive->media == ide_optical)
1089                 request_module("ide-cd");
1090         if (drive->media == ide_tape)
1091                 request_module("ide-tape");
1092         if (drive->media == ide_floppy)
1093                 request_module("ide-floppy");
1094
1095         return NULL;
1096 }
1097
1098 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1099 {
1100         struct gendisk *p = data;
1101         *part &= (1 << PARTN_BITS) - 1;
1102         return &p->dev.kobj;
1103 }
1104
1105 static int exact_lock(dev_t dev, void *data)
1106 {
1107         struct gendisk *p = data;
1108
1109         if (!get_disk(p))
1110                 return -1;
1111         return 0;
1112 }
1113
1114 void ide_register_region(struct gendisk *disk)
1115 {
1116         blk_register_region(MKDEV(disk->major, disk->first_minor),
1117                             disk->minors, NULL, exact_match, exact_lock, disk);
1118 }
1119
1120 EXPORT_SYMBOL_GPL(ide_register_region);
1121
1122 void ide_unregister_region(struct gendisk *disk)
1123 {
1124         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1125                               disk->minors);
1126 }
1127
1128 EXPORT_SYMBOL_GPL(ide_unregister_region);
1129
1130 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1131 {
1132         ide_hwif_t *hwif = drive->hwif;
1133         unsigned int unit = (drive->select.all >> 4) & 1;
1134
1135         disk->major = hwif->major;
1136         disk->first_minor = unit << PARTN_BITS;
1137         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1138         disk->queue = drive->queue;
1139 }
1140
1141 EXPORT_SYMBOL_GPL(ide_init_disk);
1142
1143 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1144 {
1145         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1146
1147         if (drive == drive->next) {
1148                 /* special case: last drive from hwgroup. */
1149                 BUG_ON(hwgroup->drive != drive);
1150                 hwgroup->drive = NULL;
1151         } else {
1152                 ide_drive_t *walk;
1153
1154                 walk = hwgroup->drive;
1155                 while (walk->next != drive)
1156                         walk = walk->next;
1157                 walk->next = drive->next;
1158                 if (hwgroup->drive == drive) {
1159                         hwgroup->drive = drive->next;
1160                         hwgroup->hwif = hwgroup->drive->hwif;
1161                 }
1162         }
1163         BUG_ON(hwgroup->drive == drive);
1164 }
1165
1166 static void drive_release_dev (struct device *dev)
1167 {
1168         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1169
1170         spin_lock_irq(&ide_lock);
1171         ide_remove_drive_from_hwgroup(drive);
1172         kfree(drive->id);
1173         drive->id = NULL;
1174         drive->present = 0;
1175         /* Messed up locking ... */
1176         spin_unlock_irq(&ide_lock);
1177         blk_cleanup_queue(drive->queue);
1178         spin_lock_irq(&ide_lock);
1179         drive->queue = NULL;
1180         spin_unlock_irq(&ide_lock);
1181
1182         complete(&drive->gendev_rel_comp);
1183 }
1184
1185 /*
1186  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1187  * after probing for drives, to allocate partition tables and other data
1188  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1189  * somewhat later, during the partition check.
1190  */
1191 static void init_gendisk (ide_hwif_t *hwif)
1192 {
1193         unsigned int unit;
1194
1195         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1196                 ide_drive_t * drive = &hwif->drives[unit];
1197                 ide_add_generic_settings(drive);
1198                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1199                          hwif->index,unit);
1200                 drive->gendev.parent = &hwif->gendev;
1201                 drive->gendev.bus = &ide_bus_type;
1202                 drive->gendev.driver_data = drive;
1203                 drive->gendev.release = drive_release_dev;
1204         }
1205         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1206                         THIS_MODULE, ata_probe, ata_lock, hwif);
1207 }
1208
1209 static int hwif_init(ide_hwif_t *hwif)
1210 {
1211         int old_irq;
1212
1213         if (!hwif->irq) {
1214                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1215                 {
1216                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1217                         return 0;
1218                 }
1219         }
1220 #ifdef CONFIG_BLK_DEV_HD
1221         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1222                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1223                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1224                 return 0;
1225         }
1226 #endif /* CONFIG_BLK_DEV_HD */
1227
1228         if (register_blkdev(hwif->major, hwif->name))
1229                 return 0;
1230
1231         if (!hwif->sg_max_nents)
1232                 hwif->sg_max_nents = PRD_ENTRIES;
1233
1234         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1235                                  GFP_KERNEL);
1236         if (!hwif->sg_table) {
1237                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1238                 goto out;
1239         }
1240
1241         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1242
1243         if (init_irq(hwif) == 0)
1244                 goto done;
1245
1246         old_irq = hwif->irq;
1247         /*
1248          *      It failed to initialise. Find the default IRQ for
1249          *      this port and try that.
1250          */
1251         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1252                 printk("%s: Disabled unable to get IRQ %d.\n",
1253                         hwif->name, old_irq);
1254                 goto out;
1255         }
1256         if (init_irq(hwif)) {
1257                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1258                         hwif->name, old_irq, hwif->irq);
1259                 goto out;
1260         }
1261         printk("%s: probed IRQ %d failed, using default.\n",
1262                 hwif->name, hwif->irq);
1263
1264 done:
1265         init_gendisk(hwif);
1266         ide_acpi_init(hwif);
1267         return 1;
1268
1269 out:
1270         unregister_blkdev(hwif->major, hwif->name);
1271         return 0;
1272 }
1273
1274 static void hwif_register_devices(ide_hwif_t *hwif)
1275 {
1276         unsigned int i;
1277
1278         for (i = 0; i < MAX_DRIVES; i++) {
1279                 ide_drive_t *drive = &hwif->drives[i];
1280
1281                 if (drive->present) {
1282                         int ret = device_register(&drive->gendev);
1283
1284                         if (ret < 0)
1285                                 printk(KERN_WARNING "IDE: %s: "
1286                                         "device_register error: %d\n",
1287                                         __FUNCTION__, ret);
1288                 }
1289         }
1290 }
1291
1292 int ide_device_add_all(u8 *idx)
1293 {
1294         ide_hwif_t *hwif;
1295         int i, rc = 0;
1296
1297         for (i = 0; i < MAX_HWIFS; i++) {
1298                 if (idx[i] == 0xff)
1299                         continue;
1300
1301                 hwif = &ide_hwifs[idx[i]];
1302
1303                 if ((hwif->chipset != ide_4drives || !hwif->mate ||
1304                      !hwif->mate->present) && ide_hwif_request_regions(hwif)) {
1305                         printk(KERN_ERR "%s: ports already in use, "
1306                                         "skipping probe\n", hwif->name);
1307                         continue;
1308                 }
1309
1310                 if (ide_probe_port(hwif) < 0) {
1311                         ide_hwif_release_regions(hwif);
1312                         continue;
1313                 }
1314
1315                 hwif->present = 1;
1316
1317                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1318                     !hwif->mate->present)
1319                         ide_register_port(hwif);
1320
1321                 ide_port_tune_devices(hwif);
1322         }
1323
1324         for (i = 0; i < MAX_HWIFS; i++) {
1325                 if (idx[i] == 0xff)
1326                         continue;
1327
1328                 hwif = &ide_hwifs[idx[i]];
1329
1330                 if (!hwif->present)
1331                         continue;
1332
1333                 if (hwif_init(hwif) == 0) {
1334                         printk(KERN_INFO "%s: failed to initialize IDE "
1335                                          "interface\n", hwif->name);
1336                         hwif->present = 0;
1337                         rc = -1;
1338                         continue;
1339                 }
1340         }
1341
1342         for (i = 0; i < MAX_HWIFS; i++) {
1343                 if (idx[i] == 0xff)
1344                         continue;
1345
1346                 hwif = &ide_hwifs[idx[i]];
1347
1348                 if (hwif->present) {
1349                         if (hwif->chipset == ide_unknown ||
1350                             hwif->chipset == ide_forced)
1351                                 hwif->chipset = ide_generic;
1352                         hwif_register_devices(hwif);
1353                 }
1354         }
1355
1356         for (i = 0; i < MAX_HWIFS; i++) {
1357                 if (idx[i] != 0xff)
1358                         ide_proc_register_port(&ide_hwifs[idx[i]]);
1359         }
1360
1361         return rc;
1362 }
1363 EXPORT_SYMBOL_GPL(ide_device_add_all);
1364
1365 int ide_device_add(u8 idx[4])
1366 {
1367         u8 idx_all[MAX_HWIFS];
1368         int i;
1369
1370         for (i = 0; i < MAX_HWIFS; i++)
1371                 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1372
1373         return ide_device_add_all(idx_all);
1374 }
1375 EXPORT_SYMBOL_GPL(ide_device_add);