drivers/ide/ide-probe.c

   1 /*
   2  *  linux/drivers/ide/ide-probe.c       Version 1.11    Mar 05, 2003
   3  *
   4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5  */
   6
   7 /*
   8  *  Mostly written by Mark Lord <mlord@pobox.com>
   9  *                and Gadi Oxman <gadio@netvision.net.il>
  10  *                and Andre Hedrick <andre@linux-ide.org>
  11  *
  12  *  See linux/MAINTAINERS for address of current maintainer.
  13  *
  14  * This is the IDE probe module, as evolved from hd.c and ide.c.
  15  *
  16  * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  17  *       by Andrea Arcangeli
  18  */
  19
  20 #include <linux/module.h>
  21 #include <linux/types.h>
  22 #include <linux/string.h>
  23 #include <linux/kernel.h>
  24 #include <linux/timer.h>
  25 #include <linux/mm.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/major.h>
  28 #include <linux/errno.h>
  29 #include <linux/genhd.h>
  30 #include <linux/slab.h>
  31 #include <linux/delay.h>
  32 #include <linux/ide.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/kmod.h>
  35 #include <linux/pci.h>
  36 #include <linux/scatterlist.h>
  37
  38 #include <asm/byteorder.h>
  39 #include <asm/irq.h>
  40 #include <asm/uaccess.h>
  41 #include <asm/io.h>
  42
  43 /**
  44  *      generic_id              -       add a generic drive id
  45  *      @drive: drive to make an ID block for
  46  *
  47  *      Add a fake id field to the drive we are passed. This allows
  48  *      use to skip a ton of NULL checks (which people always miss)
  49  *      and make drive properties unconditional outside of this file
  50  */
  51
  52 static void generic_id(ide_drive_t *drive)
  53 {
  54         drive->id->cyls = drive->cyl;
  55         drive->id->heads = drive->head;
  56         drive->id->sectors = drive->sect;
  57         drive->id->cur_cyls = drive->cyl;
  58         drive->id->cur_heads = drive->head;
  59         drive->id->cur_sectors = drive->sect;
  60 }
  61
  62 static void ide_disk_init_chs(ide_drive_t *drive)
  63 {
  64         struct hd_driveid *id = drive->id;
  65
  66         /* Extract geometry if we did not already have one for the drive */
  67         if (!drive->cyl || !drive->head || !drive->sect) {
  68                 drive->cyl  = drive->bios_cyl  = id->cyls;
  69                 drive->head = drive->bios_head = id->heads;
  70                 drive->sect = drive->bios_sect = id->sectors;
  71         }
  72
  73         /* Handle logical geometry translation by the drive */
  74         if ((id->field_valid & 1) && id->cur_cyls &&
  75             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
  76                 drive->cyl  = id->cur_cyls;
  77                 drive->head = id->cur_heads;
  78                 drive->sect = id->cur_sectors;
  79         }
  80
  81         /* Use physical geometry if what we have still makes no sense */
  82         if (drive->head > 16 && id->heads && id->heads <= 16) {
  83                 drive->cyl  = id->cyls;
  84                 drive->head = id->heads;
  85                 drive->sect = id->sectors;
  86         }
  87 }
  88
  89 static void ide_disk_init_mult_count(ide_drive_t *drive)
  90 {
  91         struct hd_driveid *id = drive->id;
  92
  93         drive->mult_count = 0;
  94         if (id->max_multsect) {
  95 #ifdef CONFIG_IDEDISK_MULTI_MODE
  96                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
  97                 id->multsect_valid = id->multsect ? 1 : 0;
  98                 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
  99                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
 100 #else   /* original, pre IDE-NFG, per request of AC */
 101                 drive->mult_req = 0;
 102                 if (drive->mult_req > id->max_multsect)
 103                         drive->mult_req = id->max_multsect;
 104                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
 105                         drive->special.b.set_multmode = 1;
 106 #endif
 107         }
 108 }
 109
 110 /**
 111  *      do_identify     -       identify a drive
 112  *      @drive: drive to identify
 113  *      @cmd: command used
 114  *
 115  *      Called when we have issued a drive identify command to
 116  *      read and parse the results. This function is run with
 117  *      interrupts disabled.
 118  */
 119
 120 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 121 {
 122         ide_hwif_t *hwif = HWIF(drive);
 123         int bswap = 1;
 124         struct hd_driveid *id;
 125
 126         id = drive->id;
 127         /* read 512 bytes of id info */
 128         hwif->ata_input_data(drive, id, SECTOR_WORDS);
 129
 130         drive->id_read = 1;
 131         local_irq_enable();
 132         ide_fix_driveid(id);
 133
 134 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 135         /*
 136          * EATA SCSI controllers do a hardware ATA emulation:
 137          * Ignore them if there is a driver for them available.
 138          */
 139         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 140             (id->model[0] == 'S' && id->model[1] == 'K')) {
 141                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 142                 goto err_misc;
 143         }
 144 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
 145
 146         /*
 147          *  WIN_IDENTIFY returns little-endian info,
 148          *  WIN_PIDENTIFY *usually* returns little-endian info.
 149          */
 150         if (cmd == WIN_PIDENTIFY) {
 151                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 152                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 153                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 154                         /* Vertos drives may still be weird */
 155                         bswap ^= 1;
 156         }
 157         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 158         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 159         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 160
 161         /* we depend on this a lot! */
 162         id->model[sizeof(id->model)-1] = '\0';
 163
 164         if (strstr(id->model, "E X A B Y T E N E S T"))
 165                 goto err_misc;
 166
 167         printk("%s: %s, ", drive->name, id->model);
 168         drive->present = 1;
 169         drive->dead = 0;
 170
 171         /*
 172          * Check for an ATAPI device
 173          */
 174         if (cmd == WIN_PIDENTIFY) {
 175                 u8 type = (id->config >> 8) & 0x1f;
 176                 printk("ATAPI ");
 177                 switch (type) {
 178                         case ide_floppy:
 179                                 if (!strstr(id->model, "CD-ROM")) {
 180                                         if (!strstr(id->model, "oppy") &&
 181                                             !strstr(id->model, "poyp") &&
 182                                             !strstr(id->model, "ZIP"))
 183                                                 printk("cdrom or floppy?, assuming ");
 184                                         if (drive->media != ide_cdrom) {
 185                                                 printk ("FLOPPY");
 186                                                 drive->removable = 1;
 187                                                 break;
 188                                         }
 189                                 }
 190                                 /* Early cdrom models used zero */
 191                                 type = ide_cdrom;
 192                         case ide_cdrom:
 193                                 drive->removable = 1;
 194 #ifdef CONFIG_PPC
 195                                 /* kludge for Apple PowerBook internal zip */
 196                                 if (!strstr(id->model, "CD-ROM") &&
 197                                     strstr(id->model, "ZIP")) {
 198                                         printk ("FLOPPY");
 199                                         type = ide_floppy;
 200                                         break;
 201                                 }
 202 #endif
 203                                 printk ("CD/DVD-ROM");
 204                                 break;
 205                         case ide_tape:
 206                                 printk ("TAPE");
 207                                 break;
 208                         case ide_optical:
 209                                 printk ("OPTICAL");
 210                                 drive->removable = 1;
 211                                 break;
 212                         default:
 213                                 printk("UNKNOWN (type %d)", type);
 214                                 break;
 215                 }
 216                 printk (" drive\n");
 217                 drive->media = type;
 218                 /* an ATAPI device ignores DRDY */
 219                 drive->ready_stat = 0;
 220                 return;
 221         }
 222
 223         /*
 224          * Not an ATAPI device: looks like a "regular" hard disk
 225          */
 226
 227         /*
 228          * 0x848a = CompactFlash device
 229          * These are *not* removable in Linux definition of the term
 230          */
 231
 232         if ((id->config != 0x848a) && (id->config & (1<<7)))
 233                 drive->removable = 1;
 234
 235         drive->media = ide_disk;
 236         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
 237
 238         return;
 239
 240 err_misc:
 241         kfree(id);
 242         drive->present = 0;
 243         return;
 244 }
 245
 246 /**
 247  *      actual_try_to_identify  -       send ata/atapi identify
 248  *      @drive: drive to identify
 249  *      @cmd: command to use
 250  *
 251  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 252  *      and waits for a response.  It also monitors irqs while this is
 253  *      happening, in hope of automatically determining which one is
 254  *      being used by the interface.
 255  *
 256  *      Returns:        0  device was identified
 257  *                      1  device timed-out (no response to identify request)
 258  *                      2  device aborted the command (refused to identify itself)
 259  */
 260
 261 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 262 {
 263         ide_hwif_t *hwif = HWIF(drive);
 264         int rc;
 265         unsigned long hd_status;
 266         unsigned long timeout;
 267         u8 s = 0, a = 0;
 268
 269         /* take a deep breath */
 270         msleep(50);
 271
 272         if (IDE_CONTROL_REG) {
 273                 a = hwif->INB(IDE_ALTSTATUS_REG);
 274                 s = hwif->INB(IDE_STATUS_REG);
 275                 if ((a ^ s) & ~INDEX_STAT) {
 276                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 277                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 278                         /* ancient Seagate drives, broken interfaces */
 279                         hd_status = IDE_STATUS_REG;
 280                 } else {
 281                         /* use non-intrusive polling */
 282                         hd_status = IDE_ALTSTATUS_REG;
 283                 }
 284         } else
 285                 hd_status = IDE_STATUS_REG;
 286
 287         /* set features register for atapi
 288          * identify command to be sure of reply
 289          */
 290         if ((cmd == WIN_PIDENTIFY))
 291                 /* disable dma & overlap */
 292                 hwif->OUTB(0, IDE_FEATURE_REG);
 293
 294         /* ask drive for ID */
 295         hwif->OUTB(cmd, IDE_COMMAND_REG);
 296
 297         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 298         timeout += jiffies;
 299         do {
 300                 if (time_after(jiffies, timeout)) {
 301                         /* drive timed-out */
 302                         return 1;
 303                 }
 304                 /* give drive a breather */
 305                 msleep(50);
 306         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 307
 308         /* wait for IRQ and DRQ_STAT */
 309         msleep(50);
 310         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 311                 unsigned long flags;
 312
 313                 /* local CPU only; some systems need this */
 314                 local_irq_save(flags);
 315                 /* drive returned ID */
 316                 do_identify(drive, cmd);
 317                 /* drive responded with ID */
 318                 rc = 0;
 319                 /* clear drive IRQ */
 320                 (void) hwif->INB(IDE_STATUS_REG);
 321                 local_irq_restore(flags);
 322         } else {
 323                 /* drive refused ID */
 324                 rc = 2;
 325         }
 326         return rc;
 327 }
 328
 329 /**
 330  *      try_to_identify -       try to identify a drive
 331  *      @drive: drive to probe
 332  *      @cmd: command to use
 333  *
 334  *      Issue the identify command and then do IRQ probing to
 335  *      complete the identification when needed by finding the
 336  *      IRQ the drive is attached to
 337  */
 338
 339 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 340 {
 341         ide_hwif_t *hwif = HWIF(drive);
 342         int retval;
 343         int autoprobe = 0;
 344         unsigned long cookie = 0;
 345
 346         /*
 347          * Disable device irq unless we need to
 348          * probe for it. Otherwise we'll get spurious
 349          * interrupts during the identify-phase that
 350          * the irq handler isn't expecting.
 351          */
 352         if (IDE_CONTROL_REG) {
 353                 u8 ctl = drive->ctl | 2;
 354                 if (!hwif->irq) {
 355                         autoprobe = 1;
 356                         cookie = probe_irq_on();
 357                         /* enable device irq */
 358                         ctl &= ~2;
 359                 }
 360                 hwif->OUTB(ctl, IDE_CONTROL_REG);
 361         }
 362
 363         retval = actual_try_to_identify(drive, cmd);
 364
 365         if (autoprobe) {
 366                 int irq;
 367                 /* mask device irq */
 368                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 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
 389 /**
 390  *      do_probe                -       probe an IDE device
 391  *      @drive: drive to probe
 392  *      @cmd: command to use
 393  *
 394  *      do_probe() has the difficult job of finding a drive if it exists,
 395  *      without getting hung up if it doesn't exist, without trampling on
 396  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 397  *
 398  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 399  *      but does not respond right away, the probe will "hang in there"
 400  *      for the maximum wait time (about 30 seconds), otherwise it will
 401  *      exit much more quickly.
 402  *
 403  * Returns:     0  device was identified
 404  *              1  device timed-out (no response to identify request)
 405  *              2  device aborted the command (refused to identify itself)
 406  *              3  bad status from device (possible for ATAPI drives)
 407  *              4  probe was not attempted because failure was obvious
 408  */
 409
 410 static int do_probe (ide_drive_t *drive, u8 cmd)
 411 {
 412         int rc;
 413         ide_hwif_t *hwif = HWIF(drive);
 414
 415         if (drive->present) {
 416                 /* avoid waiting for inappropriate probes */
 417                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 418                         return 4;
 419         }
 420 #ifdef DEBUG
 421         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 422                 drive->name, drive->present, drive->media,
 423                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 424 #endif
 425
 426         /* needed for some systems
 427          * (e.g. crw9624 as drive0 with disk as slave)
 428          */
 429         msleep(50);
 430         SELECT_DRIVE(drive);
 431         msleep(50);
 432         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 433                 if (drive->select.b.unit != 0) {
 434                         /* exit with drive0 selected */
 435                         SELECT_DRIVE(&hwif->drives[0]);
 436                         /* allow BUSY_STAT to assert & clear */
 437                         msleep(50);
 438                 }
 439                 /* no i/f present: mmm.. this should be a 4 -ml */
 440                 return 3;
 441         }
 442
 443         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 444             drive->present || cmd == WIN_PIDENTIFY) {
 445                 /* send cmd and wait */
 446                 if ((rc = try_to_identify(drive, cmd))) {
 447                         /* failed: try again */
 448                         rc = try_to_identify(drive,cmd);
 449                 }
 450                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 451                         return 4;
 452
 453                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 454                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 455                         (drive->autotune == IDE_TUNE_AUTO))) {
 456                         unsigned long timeout;
 457                         printk("%s: no response (status = 0x%02x), "
 458                                 "resetting drive\n", drive->name,
 459                                 hwif->INB(IDE_STATUS_REG));
 460                         msleep(50);
 461                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 462                         msleep(50);
 463                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 464                         timeout = jiffies;
 465                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
 466                                time_before(jiffies, timeout + WAIT_WORSTCASE))
 467                                 msleep(50);
 468                         rc = try_to_identify(drive, cmd);
 469                 }
 470                 if (rc == 1)
 471                         printk("%s: no response (status = 0x%02x)\n",
 472                                 drive->name, hwif->INB(IDE_STATUS_REG));
 473                 /* ensure drive irq is clear */
 474                 (void) hwif->INB(IDE_STATUS_REG);
 475         } else {
 476                 /* not present or maybe ATAPI */
 477                 rc = 3;
 478         }
 479         if (drive->select.b.unit != 0) {
 480                 /* exit with drive0 selected */
 481                 SELECT_DRIVE(&hwif->drives[0]);
 482                 msleep(50);
 483                 /* ensure drive irq is clear */
 484                 (void) hwif->INB(IDE_STATUS_REG);
 485         }
 486         return rc;
 487 }
 488
 489 /*
 490  *
 491  */
 492 static void enable_nest (ide_drive_t *drive)
 493 {
 494         ide_hwif_t *hwif = HWIF(drive);
 495         unsigned long timeout;
 496
 497         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 498         SELECT_DRIVE(drive);
 499         msleep(50);
 500         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 501         timeout = jiffies + WAIT_WORSTCASE;
 502         do {
 503                 if (time_after(jiffies, timeout)) {
 504                         printk("failed (timeout)\n");
 505                         return;
 506                 }
 507                 msleep(50);
 508         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 509
 510         msleep(50);
 511
 512         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 513                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 514         } else {
 515                 printk("success\n");
 516         }
 517
 518         /* if !(success||timed-out) */
 519         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 520                 /* look for ATAPI device */
 521                 (void) do_probe(drive, WIN_PIDENTIFY);
 522         }
 523 }
 524
 525 /**
 526  *      probe_for_drives        -       upper level drive probe
 527  *      @drive: drive to probe for
 528  *
 529  *      probe_for_drive() tests for existence of a given drive using do_probe()
 530  *      and presents things to the user as needed.
 531  *
 532  *      Returns:        0  no device was found
 533  *                      1  device was found (note: drive->present might
 534  *                         still be 0)
 535  */
 536
 537 static inline u8 probe_for_drive (ide_drive_t *drive)
 538 {
 539         /*
 540          *      In order to keep things simple we have an id
 541          *      block for all drives at all times. If the device
 542          *      is pre ATA or refuses ATA/ATAPI identify we
 543          *      will add faked data to this.
 544          *
 545          *      Also note that 0 everywhere means "can't do X"
 546          */
 547
 548         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 549         drive->id_read = 0;
 550         if(drive->id == NULL)
 551         {
 552                 printk(KERN_ERR "ide: out of memory for id data.\n");
 553                 return 0;
 554         }
 555         strcpy(drive->id->model, "UNKNOWN");
 556
 557         /* skip probing? */
 558         if (!drive->noprobe)
 559         {
 560                 /* if !(success||timed-out) */
 561                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 562                         /* look for ATAPI device */
 563                         (void) do_probe(drive, WIN_PIDENTIFY);
 564                 }
 565                 if (!drive->present)
 566                         /* drive not found */
 567                         return 0;
 568                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 569                         enable_nest(drive);
 570
 571                 /* identification failed? */
 572                 if (!drive->id_read) {
 573                         if (drive->media == ide_disk) {
 574                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 575                                         drive->name, drive->cyl,
 576                                         drive->head, drive->sect);
 577                         } else if (drive->media == ide_cdrom) {
 578                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 579                         } else {
 580                                 /* nuke it */
 581                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 582                                 drive->present = 0;
 583                         }
 584                 }
 585                 /* drive was found */
 586         }
 587         if(!drive->present)
 588                 return 0;
 589         /* The drive wasn't being helpful. Add generic info only */
 590         if (drive->id_read == 0) {
 591                 generic_id(drive);
 592                 return 1;
 593         }
 594
 595         if (drive->media == ide_disk) {
 596                 ide_disk_init_chs(drive);
 597                 ide_disk_init_mult_count(drive);
 598         }
 599
 600         return drive->present;
 601 }
 602
 603 static void hwif_release_dev (struct device *dev)
 604 {
 605         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 606
 607         complete(&hwif->gendev_rel_comp);
 608 }
 609
 610 static void hwif_register (ide_hwif_t *hwif)
 611 {
 612         int ret;
 613
 614         /* register with global device tree */
 615         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 616         hwif->gendev.driver_data = hwif;
 617         if (hwif->gendev.parent == NULL) {
 618                 if (hwif->pci_dev)
 619                         hwif->gendev.parent = &hwif->pci_dev->dev;
 620                 else
 621                         /* Would like to do = &device_legacy */
 622                         hwif->gendev.parent = NULL;
 623         }
 624         hwif->gendev.release = hwif_release_dev;
 625         ret = device_register(&hwif->gendev);
 626         if (ret < 0)
 627                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 628                         __FUNCTION__, ret);
 629 }
 630
 631 static int wait_hwif_ready(ide_hwif_t *hwif)
 632 {
 633         int unit, rc;
 634
 635         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 636
 637         /* Let HW settle down a bit from whatever init state we
 638          * come from */
 639         mdelay(2);
 640
 641         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 642          * I know of at least one disk who takes 31 seconds, I use 35
 643          * here to be safe
 644          */
 645         rc = ide_wait_not_busy(hwif, 35000);
 646         if (rc)
 647                 return rc;
 648
 649         /* Now make sure both master & slave are ready */
 650         for (unit = 0; unit < MAX_DRIVES; unit++) {
 651                 ide_drive_t *drive = &hwif->drives[unit];
 652
 653                 /* Ignore disks that we will not probe for later. */
 654                 if (!drive->noprobe || drive->present) {
 655                         SELECT_DRIVE(drive);
 656                         if (IDE_CONTROL_REG)
 657                                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 658                         mdelay(2);
 659                         rc = ide_wait_not_busy(hwif, 35000);
 660                         if (rc)
 661                                 goto out;
 662                 } else
 663                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 664                                           drive->name);
 665         }
 666 out:
 667         /* Exit function with master reselected (let's be sane) */
 668         if (unit)
 669                 SELECT_DRIVE(&hwif->drives[0]);
 670
 671         return rc;
 672 }
 673
 674 /**
 675  *      ide_undecoded_slave     -       look for bad CF adapters
 676  *      @drive1: drive
 677  *
 678  *      Analyse the drives on the interface and attempt to decide if we
 679  *      have the same drive viewed twice. This occurs with crap CF adapters
 680  *      and PCMCIA sometimes.
 681  */
 682
 683 void ide_undecoded_slave(ide_drive_t *drive1)
 684 {
 685         ide_drive_t *drive0 = &drive1->hwif->drives[0];
 686
 687         if ((drive1->dn & 1) == 0 || drive0->present == 0)
 688                 return;
 689
 690         /* If the models don't match they are not the same product */
 691         if (strcmp(drive0->id->model, drive1->id->model))
 692                 return;
 693
 694         /* Serial numbers do not match */
 695         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 696                 return;
 697
 698         /* No serial number, thankfully very rare for CF */
 699         if (drive0->id->serial_no[0] == 0)
 700                 return;
 701
 702         /* Appears to be an IDE flash adapter with decode bugs */
 703         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 704
 705         drive1->present = 0;
 706 }
 707
 708 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 709
 710 /*
 711  * This routine only knows how to look for drive units 0 and 1
 712  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 713  */
 714 static void probe_hwif(ide_hwif_t *hwif)
 715 {
 716         unsigned long flags;
 717         unsigned int irqd;
 718         int unit;
 719
 720         if (hwif->noprobe)
 721                 return;
 722
 723         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 724             (ide_hwif_request_regions(hwif))) {
 725                 u16 msgout = 0;
 726                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 727                         ide_drive_t *drive = &hwif->drives[unit];
 728                         if (drive->present) {
 729                                 drive->present = 0;
 730                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 731                                         drive->name);
 732                                 msgout = 1;
 733                         }
 734                 }
 735                 if (!msgout)
 736                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 737                                 hwif->name);
 738                 return;
 739         }
 740
 741         /*
 742          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 743          * we'll install our IRQ driver much later...
 744          */
 745         irqd = hwif->irq;
 746         if (irqd)
 747                 disable_irq(hwif->irq);
 748
 749         local_irq_set(flags);
 750
 751         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 752          * platforms. Typical cases are:
 753          *
 754          *  - The firmware hard reset the disk before booting the kernel,
 755          *    the drive is still doing it's poweron-reset sequence, that
 756          *    can take up to 30 seconds
 757          *  - The firmware does nothing (or no firmware), the device is
 758          *    still in POST state (same as above actually).
 759          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 760          *    their reset sequence even when they are non-selected slave
 761          *    devices, thus preventing discovery of the main HD
 762          *
 763          *  Doing this wait-for-busy should not harm any existing configuration
 764          *  (at least things won't be worse than what current code does, that
 765          *  is blindly go & talk to the drive) and fix some issues like the
 766          *  above.
 767          *
 768          *  BenH.
 769          */
 770         if (wait_hwif_ready(hwif) == -EBUSY)
 771                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 772
 773         /*
 774          * Need to probe slave device first to make it release PDIAG-.
 775          */
 776         for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
 777                 ide_drive_t *drive = &hwif->drives[unit];
 778                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 779                 (void) probe_for_drive(drive);
 780                 if (drive->present && !hwif->present) {
 781                         hwif->present = 1;
 782                         if (hwif->chipset != ide_4drives ||
 783                             !hwif->mate ||
 784                             !hwif->mate->present) {
 785                                 hwif_register(hwif);
 786                         }
 787                 }
 788         }
 789         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 790                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 791                 u8 stat;
 792
 793                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 794                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 795                 udelay(10);
 796                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 797                 do {
 798                         msleep(50);
 799                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 800                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 801
 802         }
 803         local_irq_restore(flags);
 804         /*
 805          * Use cached IRQ number. It might be (and is...) changed by probe
 806          * code above
 807          */
 808         if (irqd)
 809                 enable_irq(irqd);
 810
 811         if (!hwif->present) {
 812                 ide_hwif_release_regions(hwif);
 813                 return;
 814         }
 815
 816         for (unit = 0; unit < MAX_DRIVES; unit++) {
 817                 ide_drive_t *drive = &hwif->drives[unit];
 818
 819                 if (drive->present && hwif->quirkproc)
 820                         hwif->quirkproc(drive);
 821         }
 822
 823         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 824                 ide_drive_t *drive = &hwif->drives[unit];
 825
 826                 if (drive->present) {
 827                         if (drive->autotune == IDE_TUNE_AUTO)
 828                                 ide_set_max_pio(drive);
 829
 830                         if (drive->autotune != IDE_TUNE_DEFAULT &&
 831                             drive->autotune != IDE_TUNE_AUTO)
 832                                 continue;
 833
 834                         drive->nice1 = 1;
 835
 836                         if (hwif->dma_host_set)
 837                                 ide_set_dma(drive);
 838                 }
 839         }
 840
 841         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 842                 ide_drive_t *drive = &hwif->drives[unit];
 843
 844                 if (hwif->no_io_32bit)
 845                         drive->no_io_32bit = 1;
 846                 else
 847                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 848         }
 849 }
 850
 851 #if MAX_HWIFS > 1
 852 /*
 853  * save_match() is used to simplify logic in init_irq() below.
 854  *
 855  * A loophole here is that we may not know about a particular
 856  * hwif's irq until after that hwif is actually probed/initialized..
 857  * This could be a problem for the case where an hwif is on a
 858  * dual interface that requires serialization (eg. cmd640) and another
 859  * hwif using one of the same irqs is initialized beforehand.
 860  *
 861  * This routine detects and reports such situations, but does not fix them.
 862  */
 863 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 864 {
 865         ide_hwif_t *m = *match;
 866
 867         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 868                 if (!new->hwgroup)
 869                         return;
 870                 printk("%s: potential irq problem with %s and %s\n",
 871                         hwif->name, new->name, m->name);
 872         }
 873         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 874                 *match = new;
 875 }
 876 #endif /* MAX_HWIFS > 1 */
 877
 878 /*
 879  * init request queue
 880  */
 881 static int ide_init_queue(ide_drive_t *drive)
 882 {
 883         struct request_queue *q;
 884         ide_hwif_t *hwif = HWIF(drive);
 885         int max_sectors = 256;
 886         int max_sg_entries = PRD_ENTRIES;
 887
 888         /*
 889          *      Our default set up assumes the normal IDE case,
 890          *      that is 64K segmenting, standard PRD setup
 891          *      and LBA28. Some drivers then impose their own
 892          *      limits and LBA48 we could raise it but as yet
 893          *      do not.
 894          */
 895
 896         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 897         if (!q)
 898                 return 1;
 899
 900         q->queuedata = drive;
 901         blk_queue_segment_boundary(q, 0xffff);
 902
 903         if (!hwif->rqsize) {
 904                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
 905                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
 906                         hwif->rqsize = 256;
 907                 else
 908                         hwif->rqsize = 65536;
 909         }
 910         if (hwif->rqsize < max_sectors)
 911                 max_sectors = hwif->rqsize;
 912         blk_queue_max_sectors(q, max_sectors);
 913
 914 #ifdef CONFIG_PCI
 915         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 916          * creates segments that don't completely match our boundary
 917          * requirements and thus need to be broken up again. Because it
 918          * doesn't align properly either, we may actually have to break up
 919          * to more segments than what was we got in the first place, a max
 920          * worst case is twice as many.
 921          * This will be fixed once we teach pci_map_sg() about our boundary
 922          * requirements, hopefully soon. *FIXME*
 923          */
 924         if (!PCI_DMA_BUS_IS_PHYS)
 925                 max_sg_entries >>= 1;
 926 #endif /* CONFIG_PCI */
 927
 928         blk_queue_max_hw_segments(q, max_sg_entries);
 929         blk_queue_max_phys_segments(q, max_sg_entries);
 930
 931         /* assign drive queue */
 932         drive->queue = q;
 933
 934         /* needs drive->queue to be set */
 935         ide_toggle_bounce(drive, 1);
 936
 937         return 0;
 938 }
 939
 940 /*
 941  * This routine sets up the irq for an ide interface, and creates a new
 942  * hwgroup for the irq/hwif if none was previously assigned.
 943  *
 944  * Much of the code is for correctly detecting/handling irq sharing
 945  * and irq serialization situations.  This is somewhat complex because
 946  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 947  */
 948 static int init_irq (ide_hwif_t *hwif)
 949 {
 950         unsigned int index;
 951         ide_hwgroup_t *hwgroup;
 952         ide_hwif_t *match = NULL;
 953
 954
 955         BUG_ON(in_interrupt());
 956         BUG_ON(irqs_disabled());
 957         BUG_ON(hwif == NULL);
 958
 959         mutex_lock(&ide_cfg_mtx);
 960         hwif->hwgroup = NULL;
 961 #if MAX_HWIFS > 1
 962         /*
 963          * Group up with any other hwifs that share our irq(s).
 964          */
 965         for (index = 0; index < MAX_HWIFS; index++) {
 966                 ide_hwif_t *h = &ide_hwifs[index];
 967                 if (h->hwgroup) {  /* scan only initialized hwif's */
 968                         if (hwif->irq == h->irq) {
 969                                 hwif->sharing_irq = h->sharing_irq = 1;
 970                                 if (hwif->chipset != ide_pci ||
 971                                     h->chipset != ide_pci) {
 972                                         save_match(hwif, h, &match);
 973                                 }
 974                         }
 975                         if (hwif->serialized) {
 976                                 if (hwif->mate && hwif->mate->irq == h->irq)
 977                                         save_match(hwif, h, &match);
 978                         }
 979                         if (h->serialized) {
 980                                 if (h->mate && hwif->irq == h->mate->irq)
 981                                         save_match(hwif, h, &match);
 982                         }
 983                 }
 984         }
 985 #endif /* MAX_HWIFS > 1 */
 986         /*
 987          * If we are still without a hwgroup, then form a new one
 988          */
 989         if (match) {
 990                 hwgroup = match->hwgroup;
 991                 hwif->hwgroup = hwgroup;
 992                 /*
 993                  * Link us into the hwgroup.
 994                  * This must be done early, do ensure that unexpected_intr
 995                  * can find the hwif and prevent irq storms.
 996                  * No drives are attached to the new hwif, choose_drive
 997                  * can't do anything stupid (yet).
 998                  * Add ourself as the 2nd entry to the hwgroup->hwif
 999                  * linked list, the first entry is the hwif that owns
1000                  * hwgroup->handler - do not change that.
1001                  */
1002                 spin_lock_irq(&ide_lock);
1003                 hwif->next = hwgroup->hwif->next;
1004                 hwgroup->hwif->next = hwif;
1005                 spin_unlock_irq(&ide_lock);
1006         } else {
1007                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1008                                         GFP_KERNEL | __GFP_ZERO,
1009                                         hwif_to_node(hwif->drives[0].hwif));
1010                 if (!hwgroup)
1011                         goto out_up;
1012
1013                 hwif->hwgroup = hwgroup;
1014
1015                 hwgroup->hwif     = hwif->next = hwif;
1016                 hwgroup->rq       = NULL;
1017                 hwgroup->handler  = NULL;
1018                 hwgroup->drive    = NULL;
1019                 hwgroup->busy     = 0;
1020                 init_timer(&hwgroup->timer);
1021                 hwgroup->timer.function = &ide_timer_expiry;
1022                 hwgroup->timer.data = (unsigned long) hwgroup;
1023         }
1024
1025         /*
1026          * Allocate the irq, if not already obtained for another hwif
1027          */
1028         if (!match || match->irq != hwif->irq) {
1029                 int sa = 0;
1030 #if defined(__mc68000__) || defined(CONFIG_APUS)
1031                 sa = IRQF_SHARED;
1032 #endif /* __mc68000__ || CONFIG_APUS */
1033
1034                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1035                         sa = IRQF_SHARED;
1036
1037                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1038                         /* clear nIEN */
1039                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1040
1041                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1042                         goto out_unlink;
1043         }
1044
1045         /*
1046          * For any present drive:
1047          * - allocate the block device queue
1048          * - link drive into the hwgroup
1049          */
1050         for (index = 0; index < MAX_DRIVES; ++index) {
1051                 ide_drive_t *drive = &hwif->drives[index];
1052                 if (!drive->present)
1053                         continue;
1054                 if (ide_init_queue(drive)) {
1055                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1056                         continue;
1057                 }
1058                 spin_lock_irq(&ide_lock);
1059                 if (!hwgroup->drive) {
1060                         /* first drive for hwgroup. */
1061                         drive->next = drive;
1062                         hwgroup->drive = drive;
1063                         hwgroup->hwif = HWIF(hwgroup->drive);
1064                 } else {
1065                         drive->next = hwgroup->drive->next;
1066                         hwgroup->drive->next = drive;
1067                 }
1068                 spin_unlock_irq(&ide_lock);
1069         }
1070
1071 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1072         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1073                 hwif->io_ports[IDE_DATA_OFFSET],
1074                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1075                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1076 #else
1077         printk("%s at 0x%08lx on irq %d", hwif->name,
1078                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1079 #endif /* __mc68000__ && CONFIG_APUS */
1080         if (match)
1081                 printk(" (%sed with %s)",
1082                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1083         printk("\n");
1084         mutex_unlock(&ide_cfg_mtx);
1085         return 0;
1086 out_unlink:
1087         spin_lock_irq(&ide_lock);
1088         if (hwif->next == hwif) {
1089                 BUG_ON(match);
1090                 BUG_ON(hwgroup->hwif != hwif);
1091                 kfree(hwgroup);
1092         } else {
1093                 ide_hwif_t *g;
1094                 g = hwgroup->hwif;
1095                 while (g->next != hwif)
1096                         g = g->next;
1097                 g->next = hwif->next;
1098                 if (hwgroup->hwif == hwif) {
1099                         /* Impossible. */
1100                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1101                         hwgroup->hwif = g;
1102                 }
1103                 BUG_ON(hwgroup->hwif == hwif);
1104         }
1105         spin_unlock_irq(&ide_lock);
1106 out_up:
1107         mutex_unlock(&ide_cfg_mtx);
1108         return 1;
1109 }
1110
1111 static int ata_lock(dev_t dev, void *data)
1112 {
1113         /* FIXME: we want to pin hwif down */
1114         return 0;
1115 }
1116
1117 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1118 {
1119         ide_hwif_t *hwif = data;
1120         int unit = *part >> PARTN_BITS;
1121         ide_drive_t *drive = &hwif->drives[unit];
1122         if (!drive->present)
1123                 return NULL;
1124
1125         if (drive->media == ide_disk)
1126                 request_module("ide-disk");
1127         if (drive->scsi)
1128                 request_module("ide-scsi");
1129         if (drive->media == ide_cdrom || drive->media == ide_optical)
1130                 request_module("ide-cd");
1131         if (drive->media == ide_tape)
1132                 request_module("ide-tape");
1133         if (drive->media == ide_floppy)
1134                 request_module("ide-floppy");
1135
1136         return NULL;
1137 }
1138
1139 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1140 {
1141         struct gendisk *p = data;
1142         *part &= (1 << PARTN_BITS) - 1;
1143         return &p->dev.kobj;
1144 }
1145
1146 static int exact_lock(dev_t dev, void *data)
1147 {
1148         struct gendisk *p = data;
1149
1150         if (!get_disk(p))
1151                 return -1;
1152         return 0;
1153 }
1154
1155 void ide_register_region(struct gendisk *disk)
1156 {
1157         blk_register_region(MKDEV(disk->major, disk->first_minor),
1158                             disk->minors, NULL, exact_match, exact_lock, disk);
1159 }
1160
1161 EXPORT_SYMBOL_GPL(ide_register_region);
1162
1163 void ide_unregister_region(struct gendisk *disk)
1164 {
1165         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1166                               disk->minors);
1167 }
1168
1169 EXPORT_SYMBOL_GPL(ide_unregister_region);
1170
1171 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1172 {
1173         ide_hwif_t *hwif = drive->hwif;
1174         unsigned int unit = (drive->select.all >> 4) & 1;
1175
1176         disk->major = hwif->major;
1177         disk->first_minor = unit << PARTN_BITS;
1178         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1179         disk->queue = drive->queue;
1180 }
1181
1182 EXPORT_SYMBOL_GPL(ide_init_disk);
1183
1184 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1185 {
1186         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1187
1188         if (drive == drive->next) {
1189                 /* special case: last drive from hwgroup. */
1190                 BUG_ON(hwgroup->drive != drive);
1191                 hwgroup->drive = NULL;
1192         } else {
1193                 ide_drive_t *walk;
1194
1195                 walk = hwgroup->drive;
1196                 while (walk->next != drive)
1197                         walk = walk->next;
1198                 walk->next = drive->next;
1199                 if (hwgroup->drive == drive) {
1200                         hwgroup->drive = drive->next;
1201                         hwgroup->hwif = hwgroup->drive->hwif;
1202                 }
1203         }
1204         BUG_ON(hwgroup->drive == drive);
1205 }
1206
1207 static void drive_release_dev (struct device *dev)
1208 {
1209         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1210
1211         spin_lock_irq(&ide_lock);
1212         ide_remove_drive_from_hwgroup(drive);
1213         kfree(drive->id);
1214         drive->id = NULL;
1215         drive->present = 0;
1216         /* Messed up locking ... */
1217         spin_unlock_irq(&ide_lock);
1218         blk_cleanup_queue(drive->queue);
1219         spin_lock_irq(&ide_lock);
1220         drive->queue = NULL;
1221         spin_unlock_irq(&ide_lock);
1222
1223         complete(&drive->gendev_rel_comp);
1224 }
1225
1226 /*
1227  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1228  * after probing for drives, to allocate partition tables and other data
1229  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1230  * somewhat later, during the partition check.
1231  */
1232 static void init_gendisk (ide_hwif_t *hwif)
1233 {
1234         unsigned int unit;
1235
1236         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1237                 ide_drive_t * drive = &hwif->drives[unit];
1238                 ide_add_generic_settings(drive);
1239                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1240                          hwif->index,unit);
1241                 drive->gendev.parent = &hwif->gendev;
1242                 drive->gendev.bus = &ide_bus_type;
1243                 drive->gendev.driver_data = drive;
1244                 drive->gendev.release = drive_release_dev;
1245         }
1246         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1247                         THIS_MODULE, ata_probe, ata_lock, hwif);
1248 }
1249
1250 static int hwif_init(ide_hwif_t *hwif)
1251 {
1252         int old_irq;
1253
1254         /* Return success if no device is connected */
1255         if (!hwif->present)
1256                 return 1;
1257
1258         if (!hwif->irq) {
1259                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1260                 {
1261                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1262                         return (hwif->present = 0);
1263                 }
1264         }
1265 #ifdef CONFIG_BLK_DEV_HD
1266         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1267                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1268                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1269                 return (hwif->present = 0);
1270         }
1271 #endif /* CONFIG_BLK_DEV_HD */
1272
1273         /* we set it back to 1 if all is ok below */
1274         hwif->present = 0;
1275
1276         if (register_blkdev(hwif->major, hwif->name))
1277                 return 0;
1278
1279         if (!hwif->sg_max_nents)
1280                 hwif->sg_max_nents = PRD_ENTRIES;
1281
1282         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1283                                  GFP_KERNEL);
1284         if (!hwif->sg_table) {
1285                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1286                 goto out;
1287         }
1288
1289         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1290
1291         if (init_irq(hwif) == 0)
1292                 goto done;
1293
1294         old_irq = hwif->irq;
1295         /*
1296          *      It failed to initialise. Find the default IRQ for
1297          *      this port and try that.
1298          */
1299         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1300                 printk("%s: Disabled unable to get IRQ %d.\n",
1301                         hwif->name, old_irq);
1302                 goto out;
1303         }
1304         if (init_irq(hwif)) {
1305                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1306                         hwif->name, old_irq, hwif->irq);
1307                 goto out;
1308         }
1309         printk("%s: probed IRQ %d failed, using default.\n",
1310                 hwif->name, hwif->irq);
1311
1312 done:
1313         init_gendisk(hwif);
1314
1315         ide_acpi_init(hwif);
1316
1317         hwif->present = 1;      /* success */
1318         return 1;
1319
1320 out:
1321         unregister_blkdev(hwif->major, hwif->name);
1322         return 0;
1323 }
1324
1325 static void hwif_register_devices(ide_hwif_t *hwif)
1326 {
1327         unsigned int i;
1328
1329         for (i = 0; i < MAX_DRIVES; i++) {
1330                 ide_drive_t *drive = &hwif->drives[i];
1331
1332                 if (drive->present) {
1333                         int ret = device_register(&drive->gendev);
1334
1335                         if (ret < 0)
1336                                 printk(KERN_WARNING "IDE: %s: "
1337                                         "device_register error: %d\n",
1338                                         __FUNCTION__, ret);
1339                 }
1340         }
1341 }
1342
1343 int ideprobe_init (void)
1344 {
1345         unsigned int index;
1346         int probe[MAX_HWIFS];
1347
1348         memset(probe, 0, MAX_HWIFS * sizeof(int));
1349         for (index = 0; index < MAX_HWIFS; ++index)
1350                 probe[index] = !ide_hwifs[index].present;
1351
1352         for (index = 0; index < MAX_HWIFS; ++index)
1353                 if (probe[index])
1354                         probe_hwif(&ide_hwifs[index]);
1355         for (index = 0; index < MAX_HWIFS; ++index)
1356                 if (probe[index])
1357                         hwif_init(&ide_hwifs[index]);
1358         for (index = 0; index < MAX_HWIFS; ++index) {
1359                 if (probe[index]) {
1360                         ide_hwif_t *hwif = &ide_hwifs[index];
1361                         if (!hwif->present)
1362                                 continue;
1363                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1364                                 hwif->chipset = ide_generic;
1365                         hwif_register_devices(hwif);
1366                 }
1367         }
1368         for (index = 0; index < MAX_HWIFS; ++index)
1369                 if (probe[index])
1370                         ide_proc_register_port(&ide_hwifs[index]);
1371         return 0;
1372 }
1373
1374 EXPORT_SYMBOL_GPL(ideprobe_init);
1375
1376 int ide_device_add(u8 idx[4])
1377 {
1378         ide_hwif_t *hwif;
1379         int i, rc = 0;
1380
1381         for (i = 0; i < 4; i++) {
1382                 if (idx[i] == 0xff)
1383                         continue;
1384
1385                 probe_hwif(&ide_hwifs[idx[i]]);
1386         }
1387
1388         for (i = 0; i < 4; i++) {
1389                 if (idx[i] == 0xff)
1390                         continue;
1391
1392                 hwif = &ide_hwifs[idx[i]];
1393
1394                 if (hwif_init(hwif) == 0) {
1395                         printk(KERN_INFO "%s: failed to initialize IDE "
1396                                          "interface\n", hwif->name);
1397                         rc = -1;
1398                         continue;
1399                 }
1400         }
1401
1402         for (i = 0; i < 4; i++) {
1403                 if (idx[i] == 0xff)
1404                         continue;
1405
1406                 hwif = &ide_hwifs[idx[i]];
1407
1408                 if (hwif->present)
1409                         hwif_register_devices(hwif);
1410         }
1411
1412         for (i = 0; i < 4; i++) {
1413                 if (idx[i] != 0xff)
1414                         ide_proc_register_port(&ide_hwifs[idx[i]]);
1415         }
1416
1417         return rc;
1418 }
1419
1420 EXPORT_SYMBOL_GPL(ide_device_add);