SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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         if (hwif->quirkproc)
 239                 drive->quirk_list = hwif->quirkproc(drive);
 240
 241         return;
 242
 243 err_misc:
 244         kfree(id);
 245         drive->present = 0;
 246         return;
 247 }
 248
 249 /**
 250  *      actual_try_to_identify  -       send ata/atapi identify
 251  *      @drive: drive to identify
 252  *      @cmd: command to use
 253  *
 254  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 255  *      and waits for a response.  It also monitors irqs while this is
 256  *      happening, in hope of automatically determining which one is
 257  *      being used by the interface.
 258  *
 259  *      Returns:        0  device was identified
 260  *                      1  device timed-out (no response to identify request)
 261  *                      2  device aborted the command (refused to identify itself)
 262  */
 263
 264 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 265 {
 266         ide_hwif_t *hwif = HWIF(drive);
 267         int rc;
 268         unsigned long hd_status;
 269         unsigned long timeout;
 270         u8 s = 0, a = 0;
 271
 272         /* take a deep breath */
 273         msleep(50);
 274
 275         if (IDE_CONTROL_REG) {
 276                 a = hwif->INB(IDE_ALTSTATUS_REG);
 277                 s = hwif->INB(IDE_STATUS_REG);
 278                 if ((a ^ s) & ~INDEX_STAT) {
 279                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 280                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 281                         /* ancient Seagate drives, broken interfaces */
 282                         hd_status = IDE_STATUS_REG;
 283                 } else {
 284                         /* use non-intrusive polling */
 285                         hd_status = IDE_ALTSTATUS_REG;
 286                 }
 287         } else
 288                 hd_status = IDE_STATUS_REG;
 289
 290         /* set features register for atapi
 291          * identify command to be sure of reply
 292          */
 293         if ((cmd == WIN_PIDENTIFY))
 294                 /* disable dma & overlap */
 295                 hwif->OUTB(0, IDE_FEATURE_REG);
 296
 297         /* ask drive for ID */
 298         hwif->OUTB(cmd, IDE_COMMAND_REG);
 299
 300         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 301         timeout += jiffies;
 302         do {
 303                 if (time_after(jiffies, timeout)) {
 304                         /* drive timed-out */
 305                         return 1;
 306                 }
 307                 /* give drive a breather */
 308                 msleep(50);
 309         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 310
 311         /* wait for IRQ and DRQ_STAT */
 312         msleep(50);
 313         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 314                 unsigned long flags;
 315
 316                 /* local CPU only; some systems need this */
 317                 local_irq_save(flags);
 318                 /* drive returned ID */
 319                 do_identify(drive, cmd);
 320                 /* drive responded with ID */
 321                 rc = 0;
 322                 /* clear drive IRQ */
 323                 (void) hwif->INB(IDE_STATUS_REG);
 324                 local_irq_restore(flags);
 325         } else {
 326                 /* drive refused ID */
 327                 rc = 2;
 328         }
 329         return rc;
 330 }
 331
 332 /**
 333  *      try_to_identify -       try to identify a drive
 334  *      @drive: drive to probe
 335  *      @cmd: command to use
 336  *
 337  *      Issue the identify command and then do IRQ probing to
 338  *      complete the identification when needed by finding the
 339  *      IRQ the drive is attached to
 340  */
 341
 342 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 343 {
 344         ide_hwif_t *hwif = HWIF(drive);
 345         int retval;
 346         int autoprobe = 0;
 347         unsigned long cookie = 0;
 348
 349         /*
 350          * Disable device irq unless we need to
 351          * probe for it. Otherwise we'll get spurious
 352          * interrupts during the identify-phase that
 353          * the irq handler isn't expecting.
 354          */
 355         if (IDE_CONTROL_REG) {
 356                 u8 ctl = drive->ctl | 2;
 357                 if (!hwif->irq) {
 358                         autoprobe = 1;
 359                         cookie = probe_irq_on();
 360                         /* enable device irq */
 361                         ctl &= ~2;
 362                 }
 363                 hwif->OUTB(ctl, IDE_CONTROL_REG);
 364         }
 365
 366         retval = actual_try_to_identify(drive, cmd);
 367
 368         if (autoprobe) {
 369                 int irq;
 370                 /* mask device irq */
 371                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 372                 /* clear drive IRQ */
 373                 (void) hwif->INB(IDE_STATUS_REG);
 374                 udelay(5);
 375                 irq = probe_irq_off(cookie);
 376                 if (!hwif->irq) {
 377                         if (irq > 0) {
 378                                 hwif->irq = irq;
 379                         } else {
 380                                 /* Mmmm.. multiple IRQs..
 381                                  * don't know which was ours
 382                                  */
 383                                 printk("%s: IRQ probe failed (0x%lx)\n",
 384                                         drive->name, cookie);
 385                         }
 386                 }
 387         }
 388         return retval;
 389 }
 390
 391
 392 /**
 393  *      do_probe                -       probe an IDE device
 394  *      @drive: drive to probe
 395  *      @cmd: command to use
 396  *
 397  *      do_probe() has the difficult job of finding a drive if it exists,
 398  *      without getting hung up if it doesn't exist, without trampling on
 399  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 400  *
 401  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 402  *      but does not respond right away, the probe will "hang in there"
 403  *      for the maximum wait time (about 30 seconds), otherwise it will
 404  *      exit much more quickly.
 405  *
 406  * Returns:     0  device was identified
 407  *              1  device timed-out (no response to identify request)
 408  *              2  device aborted the command (refused to identify itself)
 409  *              3  bad status from device (possible for ATAPI drives)
 410  *              4  probe was not attempted because failure was obvious
 411  */
 412
 413 static int do_probe (ide_drive_t *drive, u8 cmd)
 414 {
 415         int rc;
 416         ide_hwif_t *hwif = HWIF(drive);
 417
 418         if (drive->present) {
 419                 /* avoid waiting for inappropriate probes */
 420                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 421                         return 4;
 422         }
 423 #ifdef DEBUG
 424         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 425                 drive->name, drive->present, drive->media,
 426                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 427 #endif
 428
 429         /* needed for some systems
 430          * (e.g. crw9624 as drive0 with disk as slave)
 431          */
 432         msleep(50);
 433         SELECT_DRIVE(drive);
 434         msleep(50);
 435         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 436                 if (drive->select.b.unit != 0) {
 437                         /* exit with drive0 selected */
 438                         SELECT_DRIVE(&hwif->drives[0]);
 439                         /* allow BUSY_STAT to assert & clear */
 440                         msleep(50);
 441                 }
 442                 /* no i/f present: mmm.. this should be a 4 -ml */
 443                 return 3;
 444         }
 445
 446         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 447             drive->present || cmd == WIN_PIDENTIFY) {
 448                 /* send cmd and wait */
 449                 if ((rc = try_to_identify(drive, cmd))) {
 450                         /* failed: try again */
 451                         rc = try_to_identify(drive,cmd);
 452                 }
 453                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 454                         return 4;
 455
 456                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 457                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 458                         (drive->autotune == IDE_TUNE_AUTO))) {
 459                         unsigned long timeout;
 460                         printk("%s: no response (status = 0x%02x), "
 461                                 "resetting drive\n", drive->name,
 462                                 hwif->INB(IDE_STATUS_REG));
 463                         msleep(50);
 464                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 465                         msleep(50);
 466                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 467                         timeout = jiffies;
 468                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
 469                                time_before(jiffies, timeout + WAIT_WORSTCASE))
 470                                 msleep(50);
 471                         rc = try_to_identify(drive, cmd);
 472                 }
 473                 if (rc == 1)
 474                         printk("%s: no response (status = 0x%02x)\n",
 475                                 drive->name, hwif->INB(IDE_STATUS_REG));
 476                 /* ensure drive irq is clear */
 477                 (void) hwif->INB(IDE_STATUS_REG);
 478         } else {
 479                 /* not present or maybe ATAPI */
 480                 rc = 3;
 481         }
 482         if (drive->select.b.unit != 0) {
 483                 /* exit with drive0 selected */
 484                 SELECT_DRIVE(&hwif->drives[0]);
 485                 msleep(50);
 486                 /* ensure drive irq is clear */
 487                 (void) hwif->INB(IDE_STATUS_REG);
 488         }
 489         return rc;
 490 }
 491
 492 /*
 493  *
 494  */
 495 static void enable_nest (ide_drive_t *drive)
 496 {
 497         ide_hwif_t *hwif = HWIF(drive);
 498         unsigned long timeout;
 499
 500         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 501         SELECT_DRIVE(drive);
 502         msleep(50);
 503         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 504         timeout = jiffies + WAIT_WORSTCASE;
 505         do {
 506                 if (time_after(jiffies, timeout)) {
 507                         printk("failed (timeout)\n");
 508                         return;
 509                 }
 510                 msleep(50);
 511         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 512
 513         msleep(50);
 514
 515         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 516                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 517         } else {
 518                 printk("success\n");
 519         }
 520
 521         /* if !(success||timed-out) */
 522         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 523                 /* look for ATAPI device */
 524                 (void) do_probe(drive, WIN_PIDENTIFY);
 525         }
 526 }
 527
 528 /**
 529  *      probe_for_drives        -       upper level drive probe
 530  *      @drive: drive to probe for
 531  *
 532  *      probe_for_drive() tests for existence of a given drive using do_probe()
 533  *      and presents things to the user as needed.
 534  *
 535  *      Returns:        0  no device was found
 536  *                      1  device was found (note: drive->present might
 537  *                         still be 0)
 538  */
 539
 540 static inline u8 probe_for_drive (ide_drive_t *drive)
 541 {
 542         /*
 543          *      In order to keep things simple we have an id
 544          *      block for all drives at all times. If the device
 545          *      is pre ATA or refuses ATA/ATAPI identify we
 546          *      will add faked data to this.
 547          *
 548          *      Also note that 0 everywhere means "can't do X"
 549          */
 550
 551         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 552         drive->id_read = 0;
 553         if(drive->id == NULL)
 554         {
 555                 printk(KERN_ERR "ide: out of memory for id data.\n");
 556                 return 0;
 557         }
 558         strcpy(drive->id->model, "UNKNOWN");
 559
 560         /* skip probing? */
 561         if (!drive->noprobe)
 562         {
 563                 /* if !(success||timed-out) */
 564                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 565                         /* look for ATAPI device */
 566                         (void) do_probe(drive, WIN_PIDENTIFY);
 567                 }
 568                 if (!drive->present)
 569                         /* drive not found */
 570                         return 0;
 571                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 572                         enable_nest(drive);
 573
 574                 /* identification failed? */
 575                 if (!drive->id_read) {
 576                         if (drive->media == ide_disk) {
 577                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 578                                         drive->name, drive->cyl,
 579                                         drive->head, drive->sect);
 580                         } else if (drive->media == ide_cdrom) {
 581                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 582                         } else {
 583                                 /* nuke it */
 584                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 585                                 drive->present = 0;
 586                         }
 587                 }
 588                 /* drive was found */
 589         }
 590         if(!drive->present)
 591                 return 0;
 592         /* The drive wasn't being helpful. Add generic info only */
 593         if (drive->id_read == 0) {
 594                 generic_id(drive);
 595                 return 1;
 596         }
 597
 598         if (drive->media == ide_disk) {
 599                 ide_disk_init_chs(drive);
 600                 ide_disk_init_mult_count(drive);
 601         }
 602
 603         return drive->present;
 604 }
 605
 606 static void hwif_release_dev (struct device *dev)
 607 {
 608         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 609
 610         complete(&hwif->gendev_rel_comp);
 611 }
 612
 613 static void hwif_register (ide_hwif_t *hwif)
 614 {
 615         int ret;
 616
 617         /* register with global device tree */
 618         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 619         hwif->gendev.driver_data = hwif;
 620         if (hwif->gendev.parent == NULL) {
 621                 if (hwif->pci_dev)
 622                         hwif->gendev.parent = &hwif->pci_dev->dev;
 623                 else
 624                         /* Would like to do = &device_legacy */
 625                         hwif->gendev.parent = NULL;
 626         }
 627         hwif->gendev.release = hwif_release_dev;
 628         ret = device_register(&hwif->gendev);
 629         if (ret < 0)
 630                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 631                         __FUNCTION__, ret);
 632 }
 633
 634 static int wait_hwif_ready(ide_hwif_t *hwif)
 635 {
 636         int unit, rc;
 637
 638         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 639
 640         /* Let HW settle down a bit from whatever init state we
 641          * come from */
 642         mdelay(2);
 643
 644         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 645          * I know of at least one disk who takes 31 seconds, I use 35
 646          * here to be safe
 647          */
 648         rc = ide_wait_not_busy(hwif, 35000);
 649         if (rc)
 650                 return rc;
 651
 652         /* Now make sure both master & slave are ready */
 653         for (unit = 0; unit < MAX_DRIVES; unit++) {
 654                 ide_drive_t *drive = &hwif->drives[unit];
 655
 656                 /* Ignore disks that we will not probe for later. */
 657                 if (!drive->noprobe || drive->present) {
 658                         SELECT_DRIVE(drive);
 659                         if (IDE_CONTROL_REG)
 660                                 hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 661                         mdelay(2);
 662                         rc = ide_wait_not_busy(hwif, 35000);
 663                         if (rc)
 664                                 goto out;
 665                 } else
 666                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 667                                           drive->name);
 668         }
 669 out:
 670         /* Exit function with master reselected (let's be sane) */
 671         if (unit)
 672                 SELECT_DRIVE(&hwif->drives[0]);
 673
 674         return rc;
 675 }
 676
 677 /**
 678  *      ide_undecoded_slave     -       look for bad CF adapters
 679  *      @hwif: interface
 680  *
 681  *      Analyse the drives on the interface and attempt to decide if we
 682  *      have the same drive viewed twice. This occurs with crap CF adapters
 683  *      and PCMCIA sometimes.
 684  */
 685
 686 void ide_undecoded_slave(ide_hwif_t *hwif)
 687 {
 688         ide_drive_t *drive0 = &hwif->drives[0];
 689         ide_drive_t *drive1 = &hwif->drives[1];
 690
 691         if (drive0->present == 0 || drive1->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                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 795                 u8 stat;
 796
 797                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 798                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 799                 udelay(10);
 800                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 801                 do {
 802                         msleep(50);
 803                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 804                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 805
 806         }
 807         local_irq_restore(flags);
 808         /*
 809          * Use cached IRQ number. It might be (and is...) changed by probe
 810          * code above
 811          */
 812         if (irqd)
 813                 enable_irq(irqd);
 814
 815         if (!hwif->present) {
 816                 ide_hwif_release_regions(hwif);
 817                 return;
 818         }
 819
 820         if (hwif->fixup)
 821                 hwif->fixup(hwif);
 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->ide_dma_on) {
 837                                 /*
 838                                  * Force DMAing for the beginning of the check.
 839                                  * Some chipsets appear to do interesting
 840                                  * things, if not checked and cleared.
 841                                  *   PARANOIA!!!
 842                                  */
 843                                 hwif->dma_off_quietly(drive);
 844                                 ide_set_dma(drive);
 845                         }
 846                 }
 847         }
 848
 849         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 850                 ide_drive_t *drive = &hwif->drives[unit];
 851
 852                 if (hwif->no_io_32bit)
 853                         drive->no_io_32bit = 1;
 854                 else
 855                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 856         }
 857 }
 858
 859 static int hwif_init(ide_hwif_t *hwif);
 860 static void hwif_register_devices(ide_hwif_t *hwif);
 861
 862 static int probe_hwif_init(ide_hwif_t *hwif)
 863 {
 864         probe_hwif(hwif);
 865
 866         if (!hwif_init(hwif)) {
 867                 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
 868                                  hwif->name);
 869                 return -1;
 870         }
 871
 872         if (hwif->present)
 873                 hwif_register_devices(hwif);
 874
 875         return 0;
 876 }
 877
 878 #if MAX_HWIFS > 1
 879 /*
 880  * save_match() is used to simplify logic in init_irq() below.
 881  *
 882  * A loophole here is that we may not know about a particular
 883  * hwif's irq until after that hwif is actually probed/initialized..
 884  * This could be a problem for the case where an hwif is on a
 885  * dual interface that requires serialization (eg. cmd640) and another
 886  * hwif using one of the same irqs is initialized beforehand.
 887  *
 888  * This routine detects and reports such situations, but does not fix them.
 889  */
 890 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 891 {
 892         ide_hwif_t *m = *match;
 893
 894         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 895                 if (!new->hwgroup)
 896                         return;
 897                 printk("%s: potential irq problem with %s and %s\n",
 898                         hwif->name, new->name, m->name);
 899         }
 900         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 901                 *match = new;
 902 }
 903 #endif /* MAX_HWIFS > 1 */
 904
 905 /*
 906  * init request queue
 907  */
 908 static int ide_init_queue(ide_drive_t *drive)
 909 {
 910         struct request_queue *q;
 911         ide_hwif_t *hwif = HWIF(drive);
 912         int max_sectors = 256;
 913         int max_sg_entries = PRD_ENTRIES;
 914
 915         /*
 916          *      Our default set up assumes the normal IDE case,
 917          *      that is 64K segmenting, standard PRD setup
 918          *      and LBA28. Some drivers then impose their own
 919          *      limits and LBA48 we could raise it but as yet
 920          *      do not.
 921          */
 922
 923         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 924         if (!q)
 925                 return 1;
 926
 927         q->queuedata = drive;
 928         blk_queue_segment_boundary(q, 0xffff);
 929
 930         if (!hwif->rqsize) {
 931                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
 932                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
 933                         hwif->rqsize = 256;
 934                 else
 935                         hwif->rqsize = 65536;
 936         }
 937         if (hwif->rqsize < max_sectors)
 938                 max_sectors = hwif->rqsize;
 939         blk_queue_max_sectors(q, max_sectors);
 940
 941 #ifdef CONFIG_PCI
 942         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 943          * creates segments that don't completely match our boundary
 944          * requirements and thus need to be broken up again. Because it
 945          * doesn't align properly either, we may actually have to break up
 946          * to more segments than what was we got in the first place, a max
 947          * worst case is twice as many.
 948          * This will be fixed once we teach pci_map_sg() about our boundary
 949          * requirements, hopefully soon. *FIXME*
 950          */
 951         if (!PCI_DMA_BUS_IS_PHYS)
 952                 max_sg_entries >>= 1;
 953 #endif /* CONFIG_PCI */
 954
 955         blk_queue_max_hw_segments(q, max_sg_entries);
 956         blk_queue_max_phys_segments(q, max_sg_entries);
 957
 958         /* assign drive queue */
 959         drive->queue = q;
 960
 961         /* needs drive->queue to be set */
 962         ide_toggle_bounce(drive, 1);
 963
 964         return 0;
 965 }
 966
 967 /*
 968  * This routine sets up the irq for an ide interface, and creates a new
 969  * hwgroup for the irq/hwif if none was previously assigned.
 970  *
 971  * Much of the code is for correctly detecting/handling irq sharing
 972  * and irq serialization situations.  This is somewhat complex because
 973  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 974  */
 975 static int init_irq (ide_hwif_t *hwif)
 976 {
 977         unsigned int index;
 978         ide_hwgroup_t *hwgroup;
 979         ide_hwif_t *match = NULL;
 980
 981
 982         BUG_ON(in_interrupt());
 983         BUG_ON(irqs_disabled());
 984         BUG_ON(hwif == NULL);
 985
 986         mutex_lock(&ide_cfg_mtx);
 987         hwif->hwgroup = NULL;
 988 #if MAX_HWIFS > 1
 989         /*
 990          * Group up with any other hwifs that share our irq(s).
 991          */
 992         for (index = 0; index < MAX_HWIFS; index++) {
 993                 ide_hwif_t *h = &ide_hwifs[index];
 994                 if (h->hwgroup) {  /* scan only initialized hwif's */
 995                         if (hwif->irq == h->irq) {
 996                                 hwif->sharing_irq = h->sharing_irq = 1;
 997                                 if (hwif->chipset != ide_pci ||
 998                                     h->chipset != ide_pci) {
 999                                         save_match(hwif, h, &match);
1000                                 }
1001                         }
1002                         if (hwif->serialized) {
1003                                 if (hwif->mate && hwif->mate->irq == h->irq)
1004                                         save_match(hwif, h, &match);
1005                         }
1006                         if (h->serialized) {
1007                                 if (h->mate && hwif->irq == h->mate->irq)
1008                                         save_match(hwif, h, &match);
1009                         }
1010                 }
1011         }
1012 #endif /* MAX_HWIFS > 1 */
1013         /*
1014          * If we are still without a hwgroup, then form a new one
1015          */
1016         if (match) {
1017                 hwgroup = match->hwgroup;
1018                 hwif->hwgroup = hwgroup;
1019                 /*
1020                  * Link us into the hwgroup.
1021                  * This must be done early, do ensure that unexpected_intr
1022                  * can find the hwif and prevent irq storms.
1023                  * No drives are attached to the new hwif, choose_drive
1024                  * can't do anything stupid (yet).
1025                  * Add ourself as the 2nd entry to the hwgroup->hwif
1026                  * linked list, the first entry is the hwif that owns
1027                  * hwgroup->handler - do not change that.
1028                  */
1029                 spin_lock_irq(&ide_lock);
1030                 hwif->next = hwgroup->hwif->next;
1031                 hwgroup->hwif->next = hwif;
1032                 spin_unlock_irq(&ide_lock);
1033         } else {
1034                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1035                                         GFP_KERNEL | __GFP_ZERO,
1036                                         hwif_to_node(hwif->drives[0].hwif));
1037                 if (!hwgroup)
1038                         goto out_up;
1039
1040                 hwif->hwgroup = hwgroup;
1041
1042                 hwgroup->hwif     = hwif->next = hwif;
1043                 hwgroup->rq       = NULL;
1044                 hwgroup->handler  = NULL;
1045                 hwgroup->drive    = NULL;
1046                 hwgroup->busy     = 0;
1047                 init_timer(&hwgroup->timer);
1048                 hwgroup->timer.function = &ide_timer_expiry;
1049                 hwgroup->timer.data = (unsigned long) hwgroup;
1050         }
1051
1052         /*
1053          * Allocate the irq, if not already obtained for another hwif
1054          */
1055         if (!match || match->irq != hwif->irq) {
1056                 int sa = 0;
1057 #if defined(__mc68000__) || defined(CONFIG_APUS)
1058                 sa = IRQF_SHARED;
1059 #endif /* __mc68000__ || CONFIG_APUS */
1060
1061                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1062                         sa = IRQF_SHARED;
1063
1064                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1065                         /* clear nIEN */
1066                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1067
1068                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1069                         goto out_unlink;
1070         }
1071
1072         /*
1073          * For any present drive:
1074          * - allocate the block device queue
1075          * - link drive into the hwgroup
1076          */
1077         for (index = 0; index < MAX_DRIVES; ++index) {
1078                 ide_drive_t *drive = &hwif->drives[index];
1079                 if (!drive->present)
1080                         continue;
1081                 if (ide_init_queue(drive)) {
1082                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1083                         continue;
1084                 }
1085                 spin_lock_irq(&ide_lock);
1086                 if (!hwgroup->drive) {
1087                         /* first drive for hwgroup. */
1088                         drive->next = drive;
1089                         hwgroup->drive = drive;
1090                         hwgroup->hwif = HWIF(hwgroup->drive);
1091                 } else {
1092                         drive->next = hwgroup->drive->next;
1093                         hwgroup->drive->next = drive;
1094                 }
1095                 spin_unlock_irq(&ide_lock);
1096         }
1097
1098 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1099         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1100                 hwif->io_ports[IDE_DATA_OFFSET],
1101                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1102                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1103 #else
1104         printk("%s at 0x%08lx on irq %d", hwif->name,
1105                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1106 #endif /* __mc68000__ && CONFIG_APUS */
1107         if (match)
1108                 printk(" (%sed with %s)",
1109                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1110         printk("\n");
1111         mutex_unlock(&ide_cfg_mtx);
1112         return 0;
1113 out_unlink:
1114         spin_lock_irq(&ide_lock);
1115         if (hwif->next == hwif) {
1116                 BUG_ON(match);
1117                 BUG_ON(hwgroup->hwif != hwif);
1118                 kfree(hwgroup);
1119         } else {
1120                 ide_hwif_t *g;
1121                 g = hwgroup->hwif;
1122                 while (g->next != hwif)
1123                         g = g->next;
1124                 g->next = hwif->next;
1125                 if (hwgroup->hwif == hwif) {
1126                         /* Impossible. */
1127                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1128                         hwgroup->hwif = g;
1129                 }
1130                 BUG_ON(hwgroup->hwif == hwif);
1131         }
1132         spin_unlock_irq(&ide_lock);
1133 out_up:
1134         mutex_unlock(&ide_cfg_mtx);
1135         return 1;
1136 }
1137
1138 static int ata_lock(dev_t dev, void *data)
1139 {
1140         /* FIXME: we want to pin hwif down */
1141         return 0;
1142 }
1143
1144 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1145 {
1146         ide_hwif_t *hwif = data;
1147         int unit = *part >> PARTN_BITS;
1148         ide_drive_t *drive = &hwif->drives[unit];
1149         if (!drive->present)
1150                 return NULL;
1151
1152         if (drive->media == ide_disk)
1153                 request_module("ide-disk");
1154         if (drive->scsi)
1155                 request_module("ide-scsi");
1156         if (drive->media == ide_cdrom || drive->media == ide_optical)
1157                 request_module("ide-cd");
1158         if (drive->media == ide_tape)
1159                 request_module("ide-tape");
1160         if (drive->media == ide_floppy)
1161                 request_module("ide-floppy");
1162
1163         return NULL;
1164 }
1165
1166 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1167 {
1168         struct gendisk *p = data;
1169         *part &= (1 << PARTN_BITS) - 1;
1170         return &p->dev.kobj;
1171 }
1172
1173 static int exact_lock(dev_t dev, void *data)
1174 {
1175         struct gendisk *p = data;
1176
1177         if (!get_disk(p))
1178                 return -1;
1179         return 0;
1180 }
1181
1182 void ide_register_region(struct gendisk *disk)
1183 {
1184         blk_register_region(MKDEV(disk->major, disk->first_minor),
1185                             disk->minors, NULL, exact_match, exact_lock, disk);
1186 }
1187
1188 EXPORT_SYMBOL_GPL(ide_register_region);
1189
1190 void ide_unregister_region(struct gendisk *disk)
1191 {
1192         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1193                               disk->minors);
1194 }
1195
1196 EXPORT_SYMBOL_GPL(ide_unregister_region);
1197
1198 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1199 {
1200         ide_hwif_t *hwif = drive->hwif;
1201         unsigned int unit = (drive->select.all >> 4) & 1;
1202
1203         disk->major = hwif->major;
1204         disk->first_minor = unit << PARTN_BITS;
1205         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1206         disk->queue = drive->queue;
1207 }
1208
1209 EXPORT_SYMBOL_GPL(ide_init_disk);
1210
1211 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1212 {
1213         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1214
1215         if (drive == drive->next) {
1216                 /* special case: last drive from hwgroup. */
1217                 BUG_ON(hwgroup->drive != drive);
1218                 hwgroup->drive = NULL;
1219         } else {
1220                 ide_drive_t *walk;
1221
1222                 walk = hwgroup->drive;
1223                 while (walk->next != drive)
1224                         walk = walk->next;
1225                 walk->next = drive->next;
1226                 if (hwgroup->drive == drive) {
1227                         hwgroup->drive = drive->next;
1228                         hwgroup->hwif = hwgroup->drive->hwif;
1229                 }
1230         }
1231         BUG_ON(hwgroup->drive == drive);
1232 }
1233
1234 static void drive_release_dev (struct device *dev)
1235 {
1236         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1237
1238         spin_lock_irq(&ide_lock);
1239         ide_remove_drive_from_hwgroup(drive);
1240         kfree(drive->id);
1241         drive->id = NULL;
1242         drive->present = 0;
1243         /* Messed up locking ... */
1244         spin_unlock_irq(&ide_lock);
1245         blk_cleanup_queue(drive->queue);
1246         spin_lock_irq(&ide_lock);
1247         drive->queue = NULL;
1248         spin_unlock_irq(&ide_lock);
1249
1250         complete(&drive->gendev_rel_comp);
1251 }
1252
1253 /*
1254  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1255  * after probing for drives, to allocate partition tables and other data
1256  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1257  * somewhat later, during the partition check.
1258  */
1259 static void init_gendisk (ide_hwif_t *hwif)
1260 {
1261         unsigned int unit;
1262
1263         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1264                 ide_drive_t * drive = &hwif->drives[unit];
1265                 ide_add_generic_settings(drive);
1266                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1267                          hwif->index,unit);
1268                 drive->gendev.parent = &hwif->gendev;
1269                 drive->gendev.bus = &ide_bus_type;
1270                 drive->gendev.driver_data = drive;
1271                 drive->gendev.release = drive_release_dev;
1272         }
1273         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1274                         THIS_MODULE, ata_probe, ata_lock, hwif);
1275 }
1276
1277 static int hwif_init(ide_hwif_t *hwif)
1278 {
1279         int old_irq;
1280
1281         /* Return success if no device is connected */
1282         if (!hwif->present)
1283                 return 1;
1284
1285         if (!hwif->irq) {
1286                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1287                 {
1288                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1289                         return (hwif->present = 0);
1290                 }
1291         }
1292 #ifdef CONFIG_BLK_DEV_HD
1293         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1294                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1295                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1296                 return (hwif->present = 0);
1297         }
1298 #endif /* CONFIG_BLK_DEV_HD */
1299
1300         /* we set it back to 1 if all is ok below */
1301         hwif->present = 0;
1302
1303         if (register_blkdev(hwif->major, hwif->name))
1304                 return 0;
1305
1306         if (!hwif->sg_max_nents)
1307                 hwif->sg_max_nents = PRD_ENTRIES;
1308
1309         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1310                                  GFP_KERNEL);
1311         if (!hwif->sg_table) {
1312                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1313                 goto out;
1314         }
1315
1316         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1317
1318         if (init_irq(hwif) == 0)
1319                 goto done;
1320
1321         old_irq = hwif->irq;
1322         /*
1323          *      It failed to initialise. Find the default IRQ for
1324          *      this port and try that.
1325          */
1326         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1327                 printk("%s: Disabled unable to get IRQ %d.\n",
1328                         hwif->name, old_irq);
1329                 goto out;
1330         }
1331         if (init_irq(hwif)) {
1332                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1333                         hwif->name, old_irq, hwif->irq);
1334                 goto out;
1335         }
1336         printk("%s: probed IRQ %d failed, using default.\n",
1337                 hwif->name, hwif->irq);
1338
1339 done:
1340         init_gendisk(hwif);
1341
1342         ide_acpi_init(hwif);
1343
1344         hwif->present = 1;      /* success */
1345         return 1;
1346
1347 out:
1348         unregister_blkdev(hwif->major, hwif->name);
1349         return 0;
1350 }
1351
1352 static void hwif_register_devices(ide_hwif_t *hwif)
1353 {
1354         unsigned int i;
1355
1356         for (i = 0; i < MAX_DRIVES; i++) {
1357                 ide_drive_t *drive = &hwif->drives[i];
1358
1359                 if (drive->present) {
1360                         int ret = device_register(&drive->gendev);
1361
1362                         if (ret < 0)
1363                                 printk(KERN_WARNING "IDE: %s: "
1364                                         "device_register error: %d\n",
1365                                         __FUNCTION__, ret);
1366                 }
1367         }
1368 }
1369
1370 int ideprobe_init (void)
1371 {
1372         unsigned int index;
1373         int probe[MAX_HWIFS];
1374
1375         memset(probe, 0, MAX_HWIFS * sizeof(int));
1376         for (index = 0; index < MAX_HWIFS; ++index)
1377                 probe[index] = !ide_hwifs[index].present;
1378
1379         for (index = 0; index < MAX_HWIFS; ++index)
1380                 if (probe[index])
1381                         probe_hwif(&ide_hwifs[index]);
1382         for (index = 0; index < MAX_HWIFS; ++index)
1383                 if (probe[index])
1384                         hwif_init(&ide_hwifs[index]);
1385         for (index = 0; index < MAX_HWIFS; ++index) {
1386                 if (probe[index]) {
1387                         ide_hwif_t *hwif = &ide_hwifs[index];
1388                         if (!hwif->present)
1389                                 continue;
1390                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1391                                 hwif->chipset = ide_generic;
1392                         hwif_register_devices(hwif);
1393                 }
1394         }
1395         for (index = 0; index < MAX_HWIFS; ++index)
1396                 if (probe[index])
1397                         ide_proc_register_port(&ide_hwifs[index]);
1398         return 0;
1399 }
1400
1401 EXPORT_SYMBOL_GPL(ideprobe_init);
1402
1403 int ide_device_add(u8 idx[4])
1404 {
1405         int i, rc = 0;
1406
1407         for (i = 0; i < 4; i++) {
1408                 if (idx[i] != 0xff)
1409                         rc |= probe_hwif_init(&ide_hwifs[idx[i]]);
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);