err.no Git - linux-2.6/blob - drivers/ide/ide-probe.c

   1 /*
   2  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   3  */
   4
   5 /*
   6  *  Mostly written by Mark Lord <mlord@pobox.com>
   7  *                and Gadi Oxman <gadio@netvision.net.il>
   8  *                and Andre Hedrick <andre@linux-ide.org>
   9  *
  10  *  See linux/MAINTAINERS for address of current maintainer.
  11  *
  12  * This is the IDE probe module, as evolved from hd.c and ide.c.
  13  *
  14  * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  15  *       by Andrea Arcangeli
  16  */
  17
  18 #include <linux/module.h>
  19 #include <linux/types.h>
  20 #include <linux/string.h>
  21 #include <linux/kernel.h>
  22 #include <linux/timer.h>
  23 #include <linux/mm.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/major.h>
  26 #include <linux/errno.h>
  27 #include <linux/genhd.h>
  28 #include <linux/slab.h>
  29 #include <linux/delay.h>
  30 #include <linux/ide.h>
  31 #include <linux/spinlock.h>
  32 #include <linux/kmod.h>
  33 #include <linux/pci.h>
  34 #include <linux/scatterlist.h>
  35
  36 #include <asm/byteorder.h>
  37 #include <asm/irq.h>
  38 #include <asm/uaccess.h>
  39 #include <asm/io.h>
  40
  41 /**
  42  *      generic_id              -       add a generic drive id
  43  *      @drive: drive to make an ID block for
  44  *
  45  *      Add a fake id field to the drive we are passed. This allows
  46  *      use to skip a ton of NULL checks (which people always miss)
  47  *      and make drive properties unconditional outside of this file
  48  */
  49
  50 static void generic_id(ide_drive_t *drive)
  51 {
  52         drive->id->cyls = drive->cyl;
  53         drive->id->heads = drive->head;
  54         drive->id->sectors = drive->sect;
  55         drive->id->cur_cyls = drive->cyl;
  56         drive->id->cur_heads = drive->head;
  57         drive->id->cur_sectors = drive->sect;
  58 }
  59
  60 static void ide_disk_init_chs(ide_drive_t *drive)
  61 {
  62         struct hd_driveid *id = drive->id;
  63
  64         /* Extract geometry if we did not already have one for the drive */
  65         if (!drive->cyl || !drive->head || !drive->sect) {
  66                 drive->cyl  = drive->bios_cyl  = id->cyls;
  67                 drive->head = drive->bios_head = id->heads;
  68                 drive->sect = drive->bios_sect = id->sectors;
  69         }
  70
  71         /* Handle logical geometry translation by the drive */
  72         if ((id->field_valid & 1) && id->cur_cyls &&
  73             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
  74                 drive->cyl  = id->cur_cyls;
  75                 drive->head = id->cur_heads;
  76                 drive->sect = id->cur_sectors;
  77         }
  78
  79         /* Use physical geometry if what we have still makes no sense */
  80         if (drive->head > 16 && id->heads && id->heads <= 16) {
  81                 drive->cyl  = id->cyls;
  82                 drive->head = id->heads;
  83                 drive->sect = id->sectors;
  84         }
  85 }
  86
  87 static void ide_disk_init_mult_count(ide_drive_t *drive)
  88 {
  89         struct hd_driveid *id = drive->id;
  90
  91         drive->mult_count = 0;
  92         if (id->max_multsect) {
  93 #ifdef CONFIG_IDEDISK_MULTI_MODE
  94                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
  95                 id->multsect_valid = id->multsect ? 1 : 0;
  96                 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
  97                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
  98 #else   /* original, pre IDE-NFG, per request of AC */
  99                 drive->mult_req = 0;
 100                 if (drive->mult_req > id->max_multsect)
 101                         drive->mult_req = id->max_multsect;
 102                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
 103                         drive->special.b.set_multmode = 1;
 104 #endif
 105         }
 106 }
 107
 108 /**
 109  *      do_identify     -       identify a drive
 110  *      @drive: drive to identify
 111  *      @cmd: command used
 112  *
 113  *      Called when we have issued a drive identify command to
 114  *      read and parse the results. This function is run with
 115  *      interrupts disabled.
 116  */
 117
 118 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 119 {
 120         ide_hwif_t *hwif = HWIF(drive);
 121         int bswap = 1;
 122         struct hd_driveid *id;
 123
 124         id = drive->id;
 125         /* read 512 bytes of id info */
 126         hwif->ata_input_data(drive, id, SECTOR_WORDS);
 127
 128         drive->id_read = 1;
 129         local_irq_enable();
 130 #ifdef DEBUG
 131         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 132         ide_dump_identify((u8 *)id);
 133 #endif
 134         ide_fix_driveid(id);
 135
 136 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 137         /*
 138          * EATA SCSI controllers do a hardware ATA emulation:
 139          * Ignore them if there is a driver for them available.
 140          */
 141         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 142             (id->model[0] == 'S' && id->model[1] == 'K')) {
 143                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 144                 goto err_misc;
 145         }
 146 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
 147
 148         /*
 149          *  WIN_IDENTIFY returns little-endian info,
 150          *  WIN_PIDENTIFY *usually* returns little-endian info.
 151          */
 152         if (cmd == WIN_PIDENTIFY) {
 153                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 154                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 155                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 156                         /* Vertos drives may still be weird */
 157                         bswap ^= 1;
 158         }
 159         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 160         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 161         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 162
 163         /* we depend on this a lot! */
 164         id->model[sizeof(id->model)-1] = '\0';
 165
 166         if (strstr(id->model, "E X A B Y T E N E S T"))
 167                 goto err_misc;
 168
 169         printk("%s: %s, ", drive->name, id->model);
 170         drive->present = 1;
 171         drive->dead = 0;
 172
 173         /*
 174          * Check for an ATAPI device
 175          */
 176         if (cmd == WIN_PIDENTIFY) {
 177                 u8 type = (id->config >> 8) & 0x1f;
 178                 printk("ATAPI ");
 179                 switch (type) {
 180                         case ide_floppy:
 181                                 if (!strstr(id->model, "CD-ROM")) {
 182                                         if (!strstr(id->model, "oppy") &&
 183                                             !strstr(id->model, "poyp") &&
 184                                             !strstr(id->model, "ZIP"))
 185                                                 printk("cdrom or floppy?, assuming ");
 186                                         if (drive->media != ide_cdrom) {
 187                                                 printk ("FLOPPY");
 188                                                 drive->removable = 1;
 189                                                 break;
 190                                         }
 191                                 }
 192                                 /* Early cdrom models used zero */
 193                                 type = ide_cdrom;
 194                         case ide_cdrom:
 195                                 drive->removable = 1;
 196 #ifdef CONFIG_PPC
 197                                 /* kludge for Apple PowerBook internal zip */
 198                                 if (!strstr(id->model, "CD-ROM") &&
 199                                     strstr(id->model, "ZIP")) {
 200                                         printk ("FLOPPY");
 201                                         type = ide_floppy;
 202                                         break;
 203                                 }
 204 #endif
 205                                 printk ("CD/DVD-ROM");
 206                                 break;
 207                         case ide_tape:
 208                                 printk ("TAPE");
 209                                 break;
 210                         case ide_optical:
 211                                 printk ("OPTICAL");
 212                                 drive->removable = 1;
 213                                 break;
 214                         default:
 215                                 printk("UNKNOWN (type %d)", type);
 216                                 break;
 217                 }
 218                 printk (" drive\n");
 219                 drive->media = type;
 220                 /* an ATAPI device ignores DRDY */
 221                 drive->ready_stat = 0;
 222                 return;
 223         }
 224
 225         /*
 226          * Not an ATAPI device: looks like a "regular" hard disk
 227          */
 228
 229         /*
 230          * 0x848a = CompactFlash device
 231          * These are *not* removable in Linux definition of the term
 232          */
 233
 234         if ((id->config != 0x848a) && (id->config & (1<<7)))
 235                 drive->removable = 1;
 236
 237         drive->media = ide_disk;
 238         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
 239
 240         return;
 241
 242 err_misc:
 243         kfree(id);
 244         drive->present = 0;
 245         return;
 246 }
 247
 248 /**
 249  *      actual_try_to_identify  -       send ata/atapi identify
 250  *      @drive: drive to identify
 251  *      @cmd: command to use
 252  *
 253  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 254  *      and waits for a response.  It also monitors irqs while this is
 255  *      happening, in hope of automatically determining which one is
 256  *      being used by the interface.
 257  *
 258  *      Returns:        0  device was identified
 259  *                      1  device timed-out (no response to identify request)
 260  *                      2  device aborted the command (refused to identify itself)
 261  */
 262
 263 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 264 {
 265         ide_hwif_t *hwif = HWIF(drive);
 266         int rc;
 267         unsigned long hd_status;
 268         unsigned long timeout;
 269         u8 s = 0, a = 0;
 270
 271         /* take a deep breath */
 272         msleep(50);
 273
 274         if (IDE_CONTROL_REG) {
 275                 a = hwif->INB(IDE_ALTSTATUS_REG);
 276                 s = hwif->INB(IDE_STATUS_REG);
 277                 if ((a ^ s) & ~INDEX_STAT) {
 278                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 279                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 280                         /* ancient Seagate drives, broken interfaces */
 281                         hd_status = IDE_STATUS_REG;
 282                 } else {
 283                         /* use non-intrusive polling */
 284                         hd_status = IDE_ALTSTATUS_REG;
 285                 }
 286         } else
 287                 hd_status = IDE_STATUS_REG;
 288
 289         /* set features register for atapi
 290          * identify command to be sure of reply
 291          */
 292         if ((cmd == WIN_PIDENTIFY))
 293                 /* disable dma & overlap */
 294                 hwif->OUTB(0, IDE_FEATURE_REG);
 295
 296         /* ask drive for ID */
 297         hwif->OUTB(cmd, IDE_COMMAND_REG);
 298
 299         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 300         timeout += jiffies;
 301         do {
 302                 if (time_after(jiffies, timeout)) {
 303                         /* drive timed-out */
 304                         return 1;
 305                 }
 306                 /* give drive a breather */
 307                 msleep(50);
 308         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 309
 310         /* wait for IRQ and DRQ_STAT */
 311         msleep(50);
 312         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 313                 unsigned long flags;
 314
 315                 /* local CPU only; some systems need this */
 316                 local_irq_save(flags);
 317                 /* drive returned ID */
 318                 do_identify(drive, cmd);
 319                 /* drive responded with ID */
 320                 rc = 0;
 321                 /* clear drive IRQ */
 322                 (void) hwif->INB(IDE_STATUS_REG);
 323                 local_irq_restore(flags);
 324         } else {
 325                 /* drive refused ID */
 326                 rc = 2;
 327         }
 328         return rc;
 329 }
 330
 331 /**
 332  *      try_to_identify -       try to identify a drive
 333  *      @drive: drive to probe
 334  *      @cmd: command to use
 335  *
 336  *      Issue the identify command and then do IRQ probing to
 337  *      complete the identification when needed by finding the
 338  *      IRQ the drive is attached to
 339  */
 340
 341 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 342 {
 343         ide_hwif_t *hwif = HWIF(drive);
 344         int retval;
 345         int autoprobe = 0;
 346         unsigned long cookie = 0;
 347
 348         /*
 349          * Disable device irq unless we need to
 350          * probe for it. Otherwise we'll get spurious
 351          * interrupts during the identify-phase that
 352          * the irq handler isn't expecting.
 353          */
 354         if (IDE_CONTROL_REG) {
 355                 if (!hwif->irq) {
 356                         autoprobe = 1;
 357                         cookie = probe_irq_on();
 358                 }
 359                 ide_set_irq(drive, autoprobe);
 360         }
 361
 362         retval = actual_try_to_identify(drive, cmd);
 363
 364         if (autoprobe) {
 365                 int irq;
 366
 367                 ide_set_irq(drive, 0);
 368                 /* clear drive IRQ */
 369                 (void) hwif->INB(IDE_STATUS_REG);
 370                 udelay(5);
 371                 irq = probe_irq_off(cookie);
 372                 if (!hwif->irq) {
 373                         if (irq > 0) {
 374                                 hwif->irq = irq;
 375                         } else {
 376                                 /* Mmmm.. multiple IRQs..
 377                                  * don't know which was ours
 378                                  */
 379                                 printk("%s: IRQ probe failed (0x%lx)\n",
 380                                         drive->name, cookie);
 381                         }
 382                 }
 383         }
 384         return retval;
 385 }
 386
 387 static int ide_busy_sleep(ide_hwif_t *hwif)
 388 {
 389         unsigned long timeout = jiffies + WAIT_WORSTCASE;
 390         u8 stat;
 391
 392         do {
 393                 msleep(50);
 394                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 395                 if ((stat & BUSY_STAT) == 0)
 396                         return 0;
 397         } while (time_before(jiffies, timeout));
 398
 399         return 1;
 400 }
 401
 402 /**
 403  *      do_probe                -       probe an IDE device
 404  *      @drive: drive to probe
 405  *      @cmd: command to use
 406  *
 407  *      do_probe() has the difficult job of finding a drive if it exists,
 408  *      without getting hung up if it doesn't exist, without trampling on
 409  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 410  *
 411  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 412  *      but does not respond right away, the probe will "hang in there"
 413  *      for the maximum wait time (about 30 seconds), otherwise it will
 414  *      exit much more quickly.
 415  *
 416  * Returns:     0  device was identified
 417  *              1  device timed-out (no response to identify request)
 418  *              2  device aborted the command (refused to identify itself)
 419  *              3  bad status from device (possible for ATAPI drives)
 420  *              4  probe was not attempted because failure was obvious
 421  */
 422
 423 static int do_probe (ide_drive_t *drive, u8 cmd)
 424 {
 425         int rc;
 426         ide_hwif_t *hwif = HWIF(drive);
 427
 428         if (drive->present) {
 429                 /* avoid waiting for inappropriate probes */
 430                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 431                         return 4;
 432         }
 433 #ifdef DEBUG
 434         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 435                 drive->name, drive->present, drive->media,
 436                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 437 #endif
 438
 439         /* needed for some systems
 440          * (e.g. crw9624 as drive0 with disk as slave)
 441          */
 442         msleep(50);
 443         SELECT_DRIVE(drive);
 444         msleep(50);
 445         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 446                 if (drive->select.b.unit != 0) {
 447                         /* exit with drive0 selected */
 448                         SELECT_DRIVE(&hwif->drives[0]);
 449                         /* allow BUSY_STAT to assert & clear */
 450                         msleep(50);
 451                 }
 452                 /* no i/f present: mmm.. this should be a 4 -ml */
 453                 return 3;
 454         }
 455
 456         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 457             drive->present || cmd == WIN_PIDENTIFY) {
 458                 /* send cmd and wait */
 459                 if ((rc = try_to_identify(drive, cmd))) {
 460                         /* failed: try again */
 461                         rc = try_to_identify(drive,cmd);
 462                 }
 463                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 464                         return 4;
 465
 466                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 467                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 468                         (drive->autotune == IDE_TUNE_AUTO))) {
 469                         printk("%s: no response (status = 0x%02x), "
 470                                 "resetting drive\n", drive->name,
 471                                 hwif->INB(IDE_STATUS_REG));
 472                         msleep(50);
 473                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 474                         msleep(50);
 475                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 476                         (void)ide_busy_sleep(hwif);
 477                         rc = try_to_identify(drive, cmd);
 478                 }
 479                 if (rc == 1)
 480                         printk("%s: no response (status = 0x%02x)\n",
 481                                 drive->name, hwif->INB(IDE_STATUS_REG));
 482                 /* ensure drive irq is clear */
 483                 (void) hwif->INB(IDE_STATUS_REG);
 484         } else {
 485                 /* not present or maybe ATAPI */
 486                 rc = 3;
 487         }
 488         if (drive->select.b.unit != 0) {
 489                 /* exit with drive0 selected */
 490                 SELECT_DRIVE(&hwif->drives[0]);
 491                 msleep(50);
 492                 /* ensure drive irq is clear */
 493                 (void) hwif->INB(IDE_STATUS_REG);
 494         }
 495         return rc;
 496 }
 497
 498 /*
 499  *
 500  */
 501 static void enable_nest (ide_drive_t *drive)
 502 {
 503         ide_hwif_t *hwif = HWIF(drive);
 504
 505         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 506         SELECT_DRIVE(drive);
 507         msleep(50);
 508         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 509
 510         if (ide_busy_sleep(hwif)) {
 511                 printk(KERN_CONT "failed (timeout)\n");
 512                 return;
 513         }
 514
 515         msleep(50);
 516
 517         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 518                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 519         } else {
 520                 printk("success\n");
 521         }
 522
 523         /* if !(success||timed-out) */
 524         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 525                 /* look for ATAPI device */
 526                 (void) do_probe(drive, WIN_PIDENTIFY);
 527         }
 528 }
 529
 530 /**
 531  *      probe_for_drives        -       upper level drive probe
 532  *      @drive: drive to probe for
 533  *
 534  *      probe_for_drive() tests for existence of a given drive using do_probe()
 535  *      and presents things to the user as needed.
 536  *
 537  *      Returns:        0  no device was found
 538  *                      1  device was found (note: drive->present might
 539  *                         still be 0)
 540  */
 541
 542 static inline u8 probe_for_drive (ide_drive_t *drive)
 543 {
 544         /*
 545          *      In order to keep things simple we have an id
 546          *      block for all drives at all times. If the device
 547          *      is pre ATA or refuses ATA/ATAPI identify we
 548          *      will add faked data to this.
 549          *
 550          *      Also note that 0 everywhere means "can't do X"
 551          */
 552
 553         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 554         drive->id_read = 0;
 555         if(drive->id == NULL)
 556         {
 557                 printk(KERN_ERR "ide: out of memory for id data.\n");
 558                 return 0;
 559         }
 560         strcpy(drive->id->model, "UNKNOWN");
 561
 562         /* skip probing? */
 563         if (!drive->noprobe)
 564         {
 565                 /* if !(success||timed-out) */
 566                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 567                         /* look for ATAPI device */
 568                         (void) do_probe(drive, WIN_PIDENTIFY);
 569                 }
 570                 if (!drive->present)
 571                         /* drive not found */
 572                         return 0;
 573                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 574                         enable_nest(drive);
 575
 576                 /* identification failed? */
 577                 if (!drive->id_read) {
 578                         if (drive->media == ide_disk) {
 579                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 580                                         drive->name, drive->cyl,
 581                                         drive->head, drive->sect);
 582                         } else if (drive->media == ide_cdrom) {
 583                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 584                         } else {
 585                                 /* nuke it */
 586                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 587                                 drive->present = 0;
 588                         }
 589                 }
 590                 /* drive was found */
 591         }
 592         if(!drive->present)
 593                 return 0;
 594         /* The drive wasn't being helpful. Add generic info only */
 595         if (drive->id_read == 0) {
 596                 generic_id(drive);
 597                 return 1;
 598         }
 599
 600         if (drive->media == ide_disk) {
 601                 ide_disk_init_chs(drive);
 602                 ide_disk_init_mult_count(drive);
 603         }
 604
 605         return drive->present;
 606 }
 607
 608 static void hwif_release_dev (struct device *dev)
 609 {
 610         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 611
 612         complete(&hwif->gendev_rel_comp);
 613 }
 614
 615 static void hwif_register (ide_hwif_t *hwif)
 616 {
 617         int ret;
 618
 619         /* register with global device tree */
 620         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 621         hwif->gendev.driver_data = hwif;
 622         if (hwif->gendev.parent == NULL) {
 623                 if (hwif->dev)
 624                         hwif->gendev.parent = hwif->dev;
 625                 else
 626                         /* Would like to do = &device_legacy */
 627                         hwif->gendev.parent = NULL;
 628         }
 629         hwif->gendev.release = hwif_release_dev;
 630         ret = device_register(&hwif->gendev);
 631         if (ret < 0)
 632                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 633                         __FUNCTION__, ret);
 634 }
 635
 636 static int wait_hwif_ready(ide_hwif_t *hwif)
 637 {
 638         int unit, rc;
 639
 640         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 641
 642         /* Let HW settle down a bit from whatever init state we
 643          * come from */
 644         mdelay(2);
 645
 646         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 647          * I know of at least one disk who takes 31 seconds, I use 35
 648          * here to be safe
 649          */
 650         rc = ide_wait_not_busy(hwif, 35000);
 651         if (rc)
 652                 return rc;
 653
 654         /* Now make sure both master & slave are ready */
 655         for (unit = 0; unit < MAX_DRIVES; unit++) {
 656                 ide_drive_t *drive = &hwif->drives[unit];
 657
 658                 /* Ignore disks that we will not probe for later. */
 659                 if (!drive->noprobe || drive->present) {
 660                         SELECT_DRIVE(drive);
 661                         ide_set_irq(drive, 1);
 662                         mdelay(2);
 663                         rc = ide_wait_not_busy(hwif, 35000);
 664                         if (rc)
 665                                 goto out;
 666                 } else
 667                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 668                                           drive->name);
 669         }
 670 out:
 671         /* Exit function with master reselected (let's be sane) */
 672         if (unit)
 673                 SELECT_DRIVE(&hwif->drives[0]);
 674
 675         return rc;
 676 }
 677
 678 /**
 679  *      ide_undecoded_slave     -       look for bad CF adapters
 680  *      @drive1: drive
 681  *
 682  *      Analyse the drives on the interface and attempt to decide if we
 683  *      have the same drive viewed twice. This occurs with crap CF adapters
 684  *      and PCMCIA sometimes.
 685  */
 686
 687 void ide_undecoded_slave(ide_drive_t *drive1)
 688 {
 689         ide_drive_t *drive0 = &drive1->hwif->drives[0];
 690
 691         if ((drive1->dn & 1) == 0 || drive0->present == 0)
 692                 return;
 693
 694         /* If the models don't match they are not the same product */
 695         if (strcmp(drive0->id->model, drive1->id->model))
 696                 return;
 697
 698         /* Serial numbers do not match */
 699         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 700                 return;
 701
 702         /* No serial number, thankfully very rare for CF */
 703         if (drive0->id->serial_no[0] == 0)
 704                 return;
 705
 706         /* Appears to be an IDE flash adapter with decode bugs */
 707         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 708
 709         drive1->present = 0;
 710 }
 711
 712 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 713
 714 /*
 715  * This routine only knows how to look for drive units 0 and 1
 716  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 717  */
 718 static void probe_hwif(ide_hwif_t *hwif)
 719 {
 720         unsigned long flags;
 721         unsigned int irqd;
 722         int unit;
 723
 724         if (hwif->noprobe)
 725                 return;
 726
 727         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 728             (ide_hwif_request_regions(hwif))) {
 729                 u16 msgout = 0;
 730                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 731                         ide_drive_t *drive = &hwif->drives[unit];
 732                         if (drive->present) {
 733                                 drive->present = 0;
 734                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 735                                         drive->name);
 736                                 msgout = 1;
 737                         }
 738                 }
 739                 if (!msgout)
 740                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 741                                 hwif->name);
 742                 return;
 743         }
 744
 745         /*
 746          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 747          * we'll install our IRQ driver much later...
 748          */
 749         irqd = hwif->irq;
 750         if (irqd)
 751                 disable_irq(hwif->irq);
 752
 753         local_irq_set(flags);
 754
 755         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 756          * platforms. Typical cases are:
 757          *
 758          *  - The firmware hard reset the disk before booting the kernel,
 759          *    the drive is still doing it's poweron-reset sequence, that
 760          *    can take up to 30 seconds
 761          *  - The firmware does nothing (or no firmware), the device is
 762          *    still in POST state (same as above actually).
 763          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 764          *    their reset sequence even when they are non-selected slave
 765          *    devices, thus preventing discovery of the main HD
 766          *
 767          *  Doing this wait-for-busy should not harm any existing configuration
 768          *  (at least things won't be worse than what current code does, that
 769          *  is blindly go & talk to the drive) and fix some issues like the
 770          *  above.
 771          *
 772          *  BenH.
 773          */
 774         if (wait_hwif_ready(hwif) == -EBUSY)
 775                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 776
 777         /*
 778          * Need to probe slave device first to make it release PDIAG-.
 779          */
 780         for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
 781                 ide_drive_t *drive = &hwif->drives[unit];
 782                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 783                 (void) probe_for_drive(drive);
 784                 if (drive->present && !hwif->present) {
 785                         hwif->present = 1;
 786                         if (hwif->chipset != ide_4drives ||
 787                             !hwif->mate ||
 788                             !hwif->mate->present) {
 789                                 hwif_register(hwif);
 790                         }
 791                 }
 792         }
 793         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 794                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 795                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 796                 udelay(10);
 797                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 798                 (void)ide_busy_sleep(hwif);
 799         }
 800         local_irq_restore(flags);
 801         /*
 802          * Use cached IRQ number. It might be (and is...) changed by probe
 803          * code above
 804          */
 805         if (irqd)
 806                 enable_irq(irqd);
 807
 808         if (!hwif->present) {
 809                 ide_hwif_release_regions(hwif);
 810                 return;
 811         }
 812
 813         for (unit = 0; unit < MAX_DRIVES; unit++) {
 814                 ide_drive_t *drive = &hwif->drives[unit];
 815
 816                 if (drive->present && hwif->quirkproc)
 817                         hwif->quirkproc(drive);
 818         }
 819
 820         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 821                 ide_drive_t *drive = &hwif->drives[unit];
 822
 823                 if (drive->present) {
 824                         if (drive->autotune == IDE_TUNE_AUTO)
 825                                 ide_set_max_pio(drive);
 826
 827                         if (drive->autotune != IDE_TUNE_DEFAULT &&
 828                             drive->autotune != IDE_TUNE_AUTO)
 829                                 continue;
 830
 831                         drive->nice1 = 1;
 832
 833                         if (hwif->dma_host_set)
 834                                 ide_set_dma(drive);
 835                 }
 836         }
 837
 838         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 839                 ide_drive_t *drive = &hwif->drives[unit];
 840
 841                 if (hwif->no_io_32bit)
 842                         drive->no_io_32bit = 1;
 843                 else
 844                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 845         }
 846 }
 847
 848 #if MAX_HWIFS > 1
 849 /*
 850  * save_match() is used to simplify logic in init_irq() below.
 851  *
 852  * A loophole here is that we may not know about a particular
 853  * hwif's irq until after that hwif is actually probed/initialized..
 854  * This could be a problem for the case where an hwif is on a
 855  * dual interface that requires serialization (eg. cmd640) and another
 856  * hwif using one of the same irqs is initialized beforehand.
 857  *
 858  * This routine detects and reports such situations, but does not fix them.
 859  */
 860 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 861 {
 862         ide_hwif_t *m = *match;
 863
 864         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 865                 if (!new->hwgroup)
 866                         return;
 867                 printk("%s: potential irq problem with %s and %s\n",
 868                         hwif->name, new->name, m->name);
 869         }
 870         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 871                 *match = new;
 872 }
 873 #endif /* MAX_HWIFS > 1 */
 874
 875 /*
 876  * init request queue
 877  */
 878 static int ide_init_queue(ide_drive_t *drive)
 879 {
 880         struct request_queue *q;
 881         ide_hwif_t *hwif = HWIF(drive);
 882         int max_sectors = 256;
 883         int max_sg_entries = PRD_ENTRIES;
 884
 885         /*
 886          *      Our default set up assumes the normal IDE case,
 887          *      that is 64K segmenting, standard PRD setup
 888          *      and LBA28. Some drivers then impose their own
 889          *      limits and LBA48 we could raise it but as yet
 890          *      do not.
 891          */
 892
 893         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 894         if (!q)
 895                 return 1;
 896
 897         q->queuedata = drive;
 898         blk_queue_segment_boundary(q, 0xffff);
 899
 900         if (!hwif->rqsize) {
 901                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
 902                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
 903                         hwif->rqsize = 256;
 904                 else
 905                         hwif->rqsize = 65536;
 906         }
 907         if (hwif->rqsize < max_sectors)
 908                 max_sectors = hwif->rqsize;
 909         blk_queue_max_sectors(q, max_sectors);
 910
 911 #ifdef CONFIG_PCI
 912         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 913          * creates segments that don't completely match our boundary
 914          * requirements and thus need to be broken up again. Because it
 915          * doesn't align properly either, we may actually have to break up
 916          * to more segments than what was we got in the first place, a max
 917          * worst case is twice as many.
 918          * This will be fixed once we teach pci_map_sg() about our boundary
 919          * requirements, hopefully soon. *FIXME*
 920          */
 921         if (!PCI_DMA_BUS_IS_PHYS)
 922                 max_sg_entries >>= 1;
 923 #endif /* CONFIG_PCI */
 924
 925         blk_queue_max_hw_segments(q, max_sg_entries);
 926         blk_queue_max_phys_segments(q, max_sg_entries);
 927
 928         /* assign drive queue */
 929         drive->queue = q;
 930
 931         /* needs drive->queue to be set */
 932         ide_toggle_bounce(drive, 1);
 933
 934         return 0;
 935 }
 936
 937 /*
 938  * This routine sets up the irq for an ide interface, and creates a new
 939  * hwgroup for the irq/hwif if none was previously assigned.
 940  *
 941  * Much of the code is for correctly detecting/handling irq sharing
 942  * and irq serialization situations.  This is somewhat complex because
 943  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 944  */
 945 static int init_irq (ide_hwif_t *hwif)
 946 {
 947         unsigned int index;
 948         ide_hwgroup_t *hwgroup;
 949         ide_hwif_t *match = NULL;
 950
 951
 952         BUG_ON(in_interrupt());
 953         BUG_ON(irqs_disabled());
 954         BUG_ON(hwif == NULL);
 955
 956         mutex_lock(&ide_cfg_mtx);
 957         hwif->hwgroup = NULL;
 958 #if MAX_HWIFS > 1
 959         /*
 960          * Group up with any other hwifs that share our irq(s).
 961          */
 962         for (index = 0; index < MAX_HWIFS; index++) {
 963                 ide_hwif_t *h = &ide_hwifs[index];
 964                 if (h->hwgroup) {  /* scan only initialized hwif's */
 965                         if (hwif->irq == h->irq) {
 966                                 hwif->sharing_irq = h->sharing_irq = 1;
 967                                 if (hwif->chipset != ide_pci ||
 968                                     h->chipset != ide_pci) {
 969                                         save_match(hwif, h, &match);
 970                                 }
 971                         }
 972                         if (hwif->serialized) {
 973                                 if (hwif->mate && hwif->mate->irq == h->irq)
 974                                         save_match(hwif, h, &match);
 975                         }
 976                         if (h->serialized) {
 977                                 if (h->mate && hwif->irq == h->mate->irq)
 978                                         save_match(hwif, h, &match);
 979                         }
 980                 }
 981         }
 982 #endif /* MAX_HWIFS > 1 */
 983         /*
 984          * If we are still without a hwgroup, then form a new one
 985          */
 986         if (match) {
 987                 hwgroup = match->hwgroup;
 988                 hwif->hwgroup = hwgroup;
 989                 /*
 990                  * Link us into the hwgroup.
 991                  * This must be done early, do ensure that unexpected_intr
 992                  * can find the hwif and prevent irq storms.
 993                  * No drives are attached to the new hwif, choose_drive
 994                  * can't do anything stupid (yet).
 995                  * Add ourself as the 2nd entry to the hwgroup->hwif
 996                  * linked list, the first entry is the hwif that owns
 997                  * hwgroup->handler - do not change that.
 998                  */
 999                 spin_lock_irq(&ide_lock);
1000                 hwif->next = hwgroup->hwif->next;
1001                 hwgroup->hwif->next = hwif;
1002                 spin_unlock_irq(&ide_lock);
1003         } else {
1004                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1005                                         GFP_KERNEL | __GFP_ZERO,
1006                                         hwif_to_node(hwif->drives[0].hwif));
1007                 if (!hwgroup)
1008                         goto out_up;
1009
1010                 hwif->hwgroup = hwgroup;
1011
1012                 hwgroup->hwif     = hwif->next = hwif;
1013                 hwgroup->rq       = NULL;
1014                 hwgroup->handler  = NULL;
1015                 hwgroup->drive    = NULL;
1016                 hwgroup->busy     = 0;
1017                 init_timer(&hwgroup->timer);
1018                 hwgroup->timer.function = &ide_timer_expiry;
1019                 hwgroup->timer.data = (unsigned long) hwgroup;
1020         }
1021
1022         /*
1023          * Allocate the irq, if not already obtained for another hwif
1024          */
1025         if (!match || match->irq != hwif->irq) {
1026                 int sa = 0;
1027 #if defined(__mc68000__) || defined(CONFIG_APUS)
1028                 sa = IRQF_SHARED;
1029 #endif /* __mc68000__ || CONFIG_APUS */
1030
1031                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1032                         sa = IRQF_SHARED;
1033
1034                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1035                         /* clear nIEN */
1036                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1037
1038                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1039                         goto out_unlink;
1040         }
1041
1042         /*
1043          * For any present drive:
1044          * - allocate the block device queue
1045          * - link drive into the hwgroup
1046          */
1047         for (index = 0; index < MAX_DRIVES; ++index) {
1048                 ide_drive_t *drive = &hwif->drives[index];
1049                 if (!drive->present)
1050                         continue;
1051                 if (ide_init_queue(drive)) {
1052                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1053                         continue;
1054                 }
1055                 spin_lock_irq(&ide_lock);
1056                 if (!hwgroup->drive) {
1057                         /* first drive for hwgroup. */
1058                         drive->next = drive;
1059                         hwgroup->drive = drive;
1060                         hwgroup->hwif = HWIF(hwgroup->drive);
1061                 } else {
1062                         drive->next = hwgroup->drive->next;
1063                         hwgroup->drive->next = drive;
1064                 }
1065                 spin_unlock_irq(&ide_lock);
1066         }
1067
1068 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1069         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1070                 hwif->io_ports[IDE_DATA_OFFSET],
1071                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1072                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1073 #else
1074         printk("%s at 0x%08lx on irq %d", hwif->name,
1075                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1076 #endif /* __mc68000__ && CONFIG_APUS */
1077         if (match)
1078                 printk(" (%sed with %s)",
1079                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1080         printk("\n");
1081         mutex_unlock(&ide_cfg_mtx);
1082         return 0;
1083 out_unlink:
1084         spin_lock_irq(&ide_lock);
1085         if (hwif->next == hwif) {
1086                 BUG_ON(match);
1087                 BUG_ON(hwgroup->hwif != hwif);
1088                 kfree(hwgroup);
1089         } else {
1090                 ide_hwif_t *g;
1091                 g = hwgroup->hwif;
1092                 while (g->next != hwif)
1093                         g = g->next;
1094                 g->next = hwif->next;
1095                 if (hwgroup->hwif == hwif) {
1096                         /* Impossible. */
1097                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1098                         hwgroup->hwif = g;
1099                 }
1100                 BUG_ON(hwgroup->hwif == hwif);
1101         }
1102         spin_unlock_irq(&ide_lock);
1103 out_up:
1104         mutex_unlock(&ide_cfg_mtx);
1105         return 1;
1106 }
1107
1108 static int ata_lock(dev_t dev, void *data)
1109 {
1110         /* FIXME: we want to pin hwif down */
1111         return 0;
1112 }
1113
1114 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1115 {
1116         ide_hwif_t *hwif = data;
1117         int unit = *part >> PARTN_BITS;
1118         ide_drive_t *drive = &hwif->drives[unit];
1119         if (!drive->present)
1120                 return NULL;
1121
1122         if (drive->media == ide_disk)
1123                 request_module("ide-disk");
1124         if (drive->scsi)
1125                 request_module("ide-scsi");
1126         if (drive->media == ide_cdrom || drive->media == ide_optical)
1127                 request_module("ide-cd");
1128         if (drive->media == ide_tape)
1129                 request_module("ide-tape");
1130         if (drive->media == ide_floppy)
1131                 request_module("ide-floppy");
1132
1133         return NULL;
1134 }
1135
1136 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1137 {
1138         struct gendisk *p = data;
1139         *part &= (1 << PARTN_BITS) - 1;
1140         return &p->dev.kobj;
1141 }
1142
1143 static int exact_lock(dev_t dev, void *data)
1144 {
1145         struct gendisk *p = data;
1146
1147         if (!get_disk(p))
1148                 return -1;
1149         return 0;
1150 }
1151
1152 void ide_register_region(struct gendisk *disk)
1153 {
1154         blk_register_region(MKDEV(disk->major, disk->first_minor),
1155                             disk->minors, NULL, exact_match, exact_lock, disk);
1156 }
1157
1158 EXPORT_SYMBOL_GPL(ide_register_region);
1159
1160 void ide_unregister_region(struct gendisk *disk)
1161 {
1162         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1163                               disk->minors);
1164 }
1165
1166 EXPORT_SYMBOL_GPL(ide_unregister_region);
1167
1168 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1169 {
1170         ide_hwif_t *hwif = drive->hwif;
1171         unsigned int unit = (drive->select.all >> 4) & 1;
1172
1173         disk->major = hwif->major;
1174         disk->first_minor = unit << PARTN_BITS;
1175         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1176         disk->queue = drive->queue;
1177 }
1178
1179 EXPORT_SYMBOL_GPL(ide_init_disk);
1180
1181 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1182 {
1183         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1184
1185         if (drive == drive->next) {
1186                 /* special case: last drive from hwgroup. */
1187                 BUG_ON(hwgroup->drive != drive);
1188                 hwgroup->drive = NULL;
1189         } else {
1190                 ide_drive_t *walk;
1191
1192                 walk = hwgroup->drive;
1193                 while (walk->next != drive)
1194                         walk = walk->next;
1195                 walk->next = drive->next;
1196                 if (hwgroup->drive == drive) {
1197                         hwgroup->drive = drive->next;
1198                         hwgroup->hwif = hwgroup->drive->hwif;
1199                 }
1200         }
1201         BUG_ON(hwgroup->drive == drive);
1202 }
1203
1204 static void drive_release_dev (struct device *dev)
1205 {
1206         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1207
1208         spin_lock_irq(&ide_lock);
1209         ide_remove_drive_from_hwgroup(drive);
1210         kfree(drive->id);
1211         drive->id = NULL;
1212         drive->present = 0;
1213         /* Messed up locking ... */
1214         spin_unlock_irq(&ide_lock);
1215         blk_cleanup_queue(drive->queue);
1216         spin_lock_irq(&ide_lock);
1217         drive->queue = NULL;
1218         spin_unlock_irq(&ide_lock);
1219
1220         complete(&drive->gendev_rel_comp);
1221 }
1222
1223 /*
1224  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1225  * after probing for drives, to allocate partition tables and other data
1226  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1227  * somewhat later, during the partition check.
1228  */
1229 static void init_gendisk (ide_hwif_t *hwif)
1230 {
1231         unsigned int unit;
1232
1233         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1234                 ide_drive_t * drive = &hwif->drives[unit];
1235                 ide_add_generic_settings(drive);
1236                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1237                          hwif->index,unit);
1238                 drive->gendev.parent = &hwif->gendev;
1239                 drive->gendev.bus = &ide_bus_type;
1240                 drive->gendev.driver_data = drive;
1241                 drive->gendev.release = drive_release_dev;
1242         }
1243         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1244                         THIS_MODULE, ata_probe, ata_lock, hwif);
1245 }
1246
1247 static int hwif_init(ide_hwif_t *hwif)
1248 {
1249         int old_irq;
1250
1251         /* Return success if no device is connected */
1252         if (!hwif->present)
1253                 return 1;
1254
1255         if (!hwif->irq) {
1256                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1257                 {
1258                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1259                         return (hwif->present = 0);
1260                 }
1261         }
1262 #ifdef CONFIG_BLK_DEV_HD
1263         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1264                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1265                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1266                 return (hwif->present = 0);
1267         }
1268 #endif /* CONFIG_BLK_DEV_HD */
1269
1270         /* we set it back to 1 if all is ok below */
1271         hwif->present = 0;
1272
1273         if (register_blkdev(hwif->major, hwif->name))
1274                 return 0;
1275
1276         if (!hwif->sg_max_nents)
1277                 hwif->sg_max_nents = PRD_ENTRIES;
1278
1279         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1280                                  GFP_KERNEL);
1281         if (!hwif->sg_table) {
1282                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1283                 goto out;
1284         }
1285
1286         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1287
1288         if (init_irq(hwif) == 0)
1289                 goto done;
1290
1291         old_irq = hwif->irq;
1292         /*
1293          *      It failed to initialise. Find the default IRQ for
1294          *      this port and try that.
1295          */
1296         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1297                 printk("%s: Disabled unable to get IRQ %d.\n",
1298                         hwif->name, old_irq);
1299                 goto out;
1300         }
1301         if (init_irq(hwif)) {
1302                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1303                         hwif->name, old_irq, hwif->irq);
1304                 goto out;
1305         }
1306         printk("%s: probed IRQ %d failed, using default.\n",
1307                 hwif->name, hwif->irq);
1308
1309 done:
1310         init_gendisk(hwif);
1311
1312         ide_acpi_init(hwif);
1313
1314         hwif->present = 1;      /* success */
1315         return 1;
1316
1317 out:
1318         unregister_blkdev(hwif->major, hwif->name);
1319         return 0;
1320 }
1321
1322 static void hwif_register_devices(ide_hwif_t *hwif)
1323 {
1324         unsigned int i;
1325
1326         for (i = 0; i < MAX_DRIVES; i++) {
1327                 ide_drive_t *drive = &hwif->drives[i];
1328
1329                 if (drive->present) {
1330                         int ret = device_register(&drive->gendev);
1331
1332                         if (ret < 0)
1333                                 printk(KERN_WARNING "IDE: %s: "
1334                                         "device_register error: %d\n",
1335                                         __FUNCTION__, ret);
1336                 }
1337         }
1338 }
1339
1340 int ide_device_add_all(u8 *idx)
1341 {
1342         ide_hwif_t *hwif;
1343         int i, rc = 0;
1344
1345         for (i = 0; i < MAX_HWIFS; i++) {
1346                 if (idx[i] == 0xff)
1347                         continue;
1348
1349                 probe_hwif(&ide_hwifs[idx[i]]);
1350         }
1351
1352         for (i = 0; i < MAX_HWIFS; i++) {
1353                 if (idx[i] == 0xff)
1354                         continue;
1355
1356                 hwif = &ide_hwifs[idx[i]];
1357
1358                 if (hwif_init(hwif) == 0) {
1359                         printk(KERN_INFO "%s: failed to initialize IDE "
1360                                          "interface\n", hwif->name);
1361                         rc = -1;
1362                         continue;
1363                 }
1364         }
1365
1366         for (i = 0; i < MAX_HWIFS; i++) {
1367                 if (idx[i] == 0xff)
1368                         continue;
1369
1370                 hwif = &ide_hwifs[idx[i]];
1371
1372                 if (hwif->present) {
1373                         if (hwif->chipset == ide_unknown ||
1374                             hwif->chipset == ide_forced)
1375                                 hwif->chipset = ide_generic;
1376                         hwif_register_devices(hwif);
1377                 }
1378         }
1379
1380         for (i = 0; i < MAX_HWIFS; i++) {
1381                 if (idx[i] != 0xff)
1382                         ide_proc_register_port(&ide_hwifs[idx[i]]);
1383         }
1384
1385         return rc;
1386 }
1387 EXPORT_SYMBOL_GPL(ide_device_add_all);
1388
1389 int ide_device_add(u8 idx[4])
1390 {
1391         u8 idx_all[MAX_HWIFS];
1392         int i;
1393
1394         for (i = 0; i < MAX_HWIFS; i++)
1395                 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1396
1397         return ide_device_add_all(idx_all);
1398 }
1399 EXPORT_SYMBOL_GPL(ide_device_add);