drivers/ide/ide-probe.c

   1 /*
   2  *  linux/drivers/ide/ide-probe.c       Version 1.11    Mar 05, 2003
   3  *
   4  *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5  */
   6
   7 /*
   8  *  Mostly written by Mark Lord <mlord@pobox.com>
   9  *                and Gadi Oxman <gadio@netvision.net.il>
  10  *                and Andre Hedrick <andre@linux-ide.org>
  11  *
  12  *  See linux/MAINTAINERS for address of current maintainer.
  13  *
  14  * This is the IDE probe module, as evolved from hd.c and ide.c.
  15  *
  16  * Version 1.00         move drive probing code from ide.c to ide-probe.c
  17  * Version 1.01         fix compilation problem for m68k
  18  * Version 1.02         increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  19  *                       by Andrea Arcangeli
  20  * Version 1.03         fix for (hwif->chipset == ide_4drives)
  21  * Version 1.04         fixed buggy treatments of known flash memory cards
  22  *
  23  * Version 1.05         fix for (hwif->chipset == ide_pdc4030)
  24  *                      added ide6/7/8/9
  25  *                      allowed for secondary flash card to be detectable
  26  *                       with new flag : drive->ata_flash : 1;
  27  * Version 1.06         stream line request queue and prep for cascade project.
  28  * Version 1.07         max_sect <= 255; slower disks would get behind and
  29  *                      then fall over when they get to 256.    Paul G.
  30  * Version 1.10         Update set for new IDE. drive->id is now always
  31  *                      valid after probe time even with noprobe
  32  */
  33
  34 #include <linux/module.h>
  35 #include <linux/types.h>
  36 #include <linux/string.h>
  37 #include <linux/kernel.h>
  38 #include <linux/timer.h>
  39 #include <linux/mm.h>
  40 #include <linux/interrupt.h>
  41 #include <linux/major.h>
  42 #include <linux/errno.h>
  43 #include <linux/genhd.h>
  44 #include <linux/slab.h>
  45 #include <linux/delay.h>
  46 #include <linux/ide.h>
  47 #include <linux/spinlock.h>
  48 #include <linux/kmod.h>
  49 #include <linux/pci.h>
  50 #include <linux/scatterlist.h>
  51
  52 #include <asm/byteorder.h>
  53 #include <asm/irq.h>
  54 #include <asm/uaccess.h>
  55 #include <asm/io.h>
  56
  57 /**
  58  *      generic_id              -       add a generic drive id
  59  *      @drive: drive to make an ID block for
  60  *
  61  *      Add a fake id field to the drive we are passed. This allows
  62  *      use to skip a ton of NULL checks (which people always miss)
  63  *      and make drive properties unconditional outside of this file
  64  */
  65
  66 static void generic_id(ide_drive_t *drive)
  67 {
  68         drive->id->cyls = drive->cyl;
  69         drive->id->heads = drive->head;
  70         drive->id->sectors = drive->sect;
  71         drive->id->cur_cyls = drive->cyl;
  72         drive->id->cur_heads = drive->head;
  73         drive->id->cur_sectors = drive->sect;
  74 }
  75
  76 static void ide_disk_init_chs(ide_drive_t *drive)
  77 {
  78         struct hd_driveid *id = drive->id;
  79
  80         /* Extract geometry if we did not already have one for the drive */
  81         if (!drive->cyl || !drive->head || !drive->sect) {
  82                 drive->cyl  = drive->bios_cyl  = id->cyls;
  83                 drive->head = drive->bios_head = id->heads;
  84                 drive->sect = drive->bios_sect = id->sectors;
  85         }
  86
  87         /* Handle logical geometry translation by the drive */
  88         if ((id->field_valid & 1) && id->cur_cyls &&
  89             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
  90                 drive->cyl  = id->cur_cyls;
  91                 drive->head = id->cur_heads;
  92                 drive->sect = id->cur_sectors;
  93         }
  94
  95         /* Use physical geometry if what we have still makes no sense */
  96         if (drive->head > 16 && id->heads && id->heads <= 16) {
  97                 drive->cyl  = id->cyls;
  98                 drive->head = id->heads;
  99                 drive->sect = id->sectors;
 100         }
 101 }
 102
 103 static void ide_disk_init_mult_count(ide_drive_t *drive)
 104 {
 105         struct hd_driveid *id = drive->id;
 106
 107         drive->mult_count = 0;
 108         if (id->max_multsect) {
 109 #ifdef CONFIG_IDEDISK_MULTI_MODE
 110                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
 111                 id->multsect_valid = id->multsect ? 1 : 0;
 112                 drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
 113                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
 114 #else   /* original, pre IDE-NFG, per request of AC */
 115                 drive->mult_req = INITIAL_MULT_COUNT;
 116                 if (drive->mult_req > id->max_multsect)
 117                         drive->mult_req = id->max_multsect;
 118                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
 119                         drive->special.b.set_multmode = 1;
 120 #endif
 121         }
 122 }
 123
 124 /**
 125  *      do_identify     -       identify a drive
 126  *      @drive: drive to identify
 127  *      @cmd: command used
 128  *
 129  *      Called when we have issued a drive identify command to
 130  *      read and parse the results. This function is run with
 131  *      interrupts disabled.
 132  */
 133
 134 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 135 {
 136         ide_hwif_t *hwif = HWIF(drive);
 137         int bswap = 1;
 138         struct hd_driveid *id;
 139
 140         id = drive->id;
 141         /* read 512 bytes of id info */
 142         hwif->ata_input_data(drive, id, SECTOR_WORDS);
 143
 144         drive->id_read = 1;
 145         local_irq_enable();
 146         ide_fix_driveid(id);
 147
 148 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 149         /*
 150          * EATA SCSI controllers do a hardware ATA emulation:
 151          * Ignore them if there is a driver for them available.
 152          */
 153         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 154             (id->model[0] == 'S' && id->model[1] == 'K')) {
 155                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 156                 goto err_misc;
 157         }
 158 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
 159
 160         /*
 161          *  WIN_IDENTIFY returns little-endian info,
 162          *  WIN_PIDENTIFY *usually* returns little-endian info.
 163          */
 164         if (cmd == WIN_PIDENTIFY) {
 165                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 166                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 167                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 168                         /* Vertos drives may still be weird */
 169                         bswap ^= 1;
 170         }
 171         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 172         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 173         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 174
 175         /* we depend on this a lot! */
 176         id->model[sizeof(id->model)-1] = '\0';
 177
 178         if (strstr(id->model, "E X A B Y T E N E S T"))
 179                 goto err_misc;
 180
 181         printk("%s: %s, ", drive->name, id->model);
 182         drive->present = 1;
 183         drive->dead = 0;
 184
 185         /*
 186          * Check for an ATAPI device
 187          */
 188         if (cmd == WIN_PIDENTIFY) {
 189                 u8 type = (id->config >> 8) & 0x1f;
 190                 printk("ATAPI ");
 191                 switch (type) {
 192                         case ide_floppy:
 193                                 if (!strstr(id->model, "CD-ROM")) {
 194                                         if (!strstr(id->model, "oppy") &&
 195                                             !strstr(id->model, "poyp") &&
 196                                             !strstr(id->model, "ZIP"))
 197                                                 printk("cdrom or floppy?, assuming ");
 198                                         if (drive->media != ide_cdrom) {
 199                                                 printk ("FLOPPY");
 200                                                 drive->removable = 1;
 201                                                 break;
 202                                         }
 203                                 }
 204                                 /* Early cdrom models used zero */
 205                                 type = ide_cdrom;
 206                         case ide_cdrom:
 207                                 drive->removable = 1;
 208 #ifdef CONFIG_PPC
 209                                 /* kludge for Apple PowerBook internal zip */
 210                                 if (!strstr(id->model, "CD-ROM") &&
 211                                     strstr(id->model, "ZIP")) {
 212                                         printk ("FLOPPY");
 213                                         type = ide_floppy;
 214                                         break;
 215                                 }
 216 #endif
 217                                 printk ("CD/DVD-ROM");
 218                                 break;
 219                         case ide_tape:
 220                                 printk ("TAPE");
 221                                 break;
 222                         case ide_optical:
 223                                 printk ("OPTICAL");
 224                                 drive->removable = 1;
 225                                 break;
 226                         default:
 227                                 printk("UNKNOWN (type %d)", type);
 228                                 break;
 229                 }
 230                 printk (" drive\n");
 231                 drive->media = type;
 232                 /* an ATAPI device ignores DRDY */
 233                 drive->ready_stat = 0;
 234                 return;
 235         }
 236
 237         /*
 238          * Not an ATAPI device: looks like a "regular" hard disk
 239          */
 240
 241         /*
 242          * 0x848a = CompactFlash device
 243          * These are *not* removable in Linux definition of the term
 244          */
 245
 246         if ((id->config != 0x848a) && (id->config & (1<<7)))
 247                 drive->removable = 1;
 248
 249         drive->media = ide_disk;
 250         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
 251         QUIRK_LIST(drive);
 252         return;
 253
 254 err_misc:
 255         kfree(id);
 256         drive->present = 0;
 257         return;
 258 }
 259
 260 /**
 261  *      actual_try_to_identify  -       send ata/atapi identify
 262  *      @drive: drive to identify
 263  *      @cmd: command to use
 264  *
 265  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 266  *      and waits for a response.  It also monitors irqs while this is
 267  *      happening, in hope of automatically determining which one is
 268  *      being used by the interface.
 269  *
 270  *      Returns:        0  device was identified
 271  *                      1  device timed-out (no response to identify request)
 272  *                      2  device aborted the command (refused to identify itself)
 273  */
 274
 275 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 276 {
 277         ide_hwif_t *hwif = HWIF(drive);
 278         int rc;
 279         unsigned long hd_status;
 280         unsigned long timeout;
 281         u8 s = 0, a = 0;
 282
 283         /* take a deep breath */
 284         msleep(50);
 285
 286         if (IDE_CONTROL_REG) {
 287                 a = hwif->INB(IDE_ALTSTATUS_REG);
 288                 s = hwif->INB(IDE_STATUS_REG);
 289                 if ((a ^ s) & ~INDEX_STAT) {
 290                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 291                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 292                         /* ancient Seagate drives, broken interfaces */
 293                         hd_status = IDE_STATUS_REG;
 294                 } else {
 295                         /* use non-intrusive polling */
 296                         hd_status = IDE_ALTSTATUS_REG;
 297                 }
 298         } else
 299                 hd_status = IDE_STATUS_REG;
 300
 301         /* set features register for atapi
 302          * identify command to be sure of reply
 303          */
 304         if ((cmd == WIN_PIDENTIFY))
 305                 /* disable dma & overlap */
 306                 hwif->OUTB(0, IDE_FEATURE_REG);
 307
 308         /* ask drive for ID */
 309         hwif->OUTB(cmd, IDE_COMMAND_REG);
 310
 311         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 312         timeout += jiffies;
 313         do {
 314                 if (time_after(jiffies, timeout)) {
 315                         /* drive timed-out */
 316                         return 1;
 317                 }
 318                 /* give drive a breather */
 319                 msleep(50);
 320         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 321
 322         /* wait for IRQ and DRQ_STAT */
 323         msleep(50);
 324         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 325                 unsigned long flags;
 326
 327                 /* local CPU only; some systems need this */
 328                 local_irq_save(flags);
 329                 /* drive returned ID */
 330                 do_identify(drive, cmd);
 331                 /* drive responded with ID */
 332                 rc = 0;
 333                 /* clear drive IRQ */
 334                 (void) hwif->INB(IDE_STATUS_REG);
 335                 local_irq_restore(flags);
 336         } else {
 337                 /* drive refused ID */
 338                 rc = 2;
 339         }
 340         return rc;
 341 }
 342
 343 /**
 344  *      try_to_identify -       try to identify a drive
 345  *      @drive: drive to probe
 346  *      @cmd: command to use
 347  *
 348  *      Issue the identify command and then do IRQ probing to
 349  *      complete the identification when needed by finding the
 350  *      IRQ the drive is attached to
 351  */
 352
 353 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 354 {
 355         ide_hwif_t *hwif = HWIF(drive);
 356         int retval;
 357         int autoprobe = 0;
 358         unsigned long cookie = 0;
 359
 360         /*
 361          * Disable device irq unless we need to
 362          * probe for it. Otherwise we'll get spurious
 363          * interrupts during the identify-phase that
 364          * the irq handler isn't expecting.
 365          */
 366         if (IDE_CONTROL_REG) {
 367                 u8 ctl = drive->ctl | 2;
 368                 if (!hwif->irq) {
 369                         autoprobe = 1;
 370                         cookie = probe_irq_on();
 371                         /* enable device irq */
 372                         ctl &= ~2;
 373                 }
 374                 hwif->OUTB(ctl, IDE_CONTROL_REG);
 375         }
 376
 377         retval = actual_try_to_identify(drive, cmd);
 378
 379         if (autoprobe) {
 380                 int irq;
 381                 /* mask device irq */
 382                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 383                 /* clear drive IRQ */
 384                 (void) hwif->INB(IDE_STATUS_REG);
 385                 udelay(5);
 386                 irq = probe_irq_off(cookie);
 387                 if (!hwif->irq) {
 388                         if (irq > 0) {
 389                                 hwif->irq = irq;
 390                         } else {
 391                                 /* Mmmm.. multiple IRQs..
 392                                  * don't know which was ours
 393                                  */
 394                                 printk("%s: IRQ probe failed (0x%lx)\n",
 395                                         drive->name, cookie);
 396                         }
 397                 }
 398         }
 399         return retval;
 400 }
 401
 402
 403 /**
 404  *      do_probe                -       probe an IDE device
 405  *      @drive: drive to probe
 406  *      @cmd: command to use
 407  *
 408  *      do_probe() has the difficult job of finding a drive if it exists,
 409  *      without getting hung up if it doesn't exist, without trampling on
 410  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 411  *
 412  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 413  *      but does not respond right away, the probe will "hang in there"
 414  *      for the maximum wait time (about 30 seconds), otherwise it will
 415  *      exit much more quickly.
 416  *
 417  * Returns:     0  device was identified
 418  *              1  device timed-out (no response to identify request)
 419  *              2  device aborted the command (refused to identify itself)
 420  *              3  bad status from device (possible for ATAPI drives)
 421  *              4  probe was not attempted because failure was obvious
 422  */
 423
 424 static int do_probe (ide_drive_t *drive, u8 cmd)
 425 {
 426         int rc;
 427         ide_hwif_t *hwif = HWIF(drive);
 428
 429         if (drive->present) {
 430                 /* avoid waiting for inappropriate probes */
 431                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 432                         return 4;
 433         }
 434 #ifdef DEBUG
 435         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 436                 drive->name, drive->present, drive->media,
 437                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 438 #endif
 439
 440         /* needed for some systems
 441          * (e.g. crw9624 as drive0 with disk as slave)
 442          */
 443         msleep(50);
 444         SELECT_DRIVE(drive);
 445         msleep(50);
 446         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 447                 if (drive->select.b.unit != 0) {
 448                         /* exit with drive0 selected */
 449                         SELECT_DRIVE(&hwif->drives[0]);
 450                         /* allow BUSY_STAT to assert & clear */
 451                         msleep(50);
 452                 }
 453                 /* no i/f present: mmm.. this should be a 4 -ml */
 454                 return 3;
 455         }
 456
 457         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 458             drive->present || cmd == WIN_PIDENTIFY) {
 459                 /* send cmd and wait */
 460                 if ((rc = try_to_identify(drive, cmd))) {
 461                         /* failed: try again */
 462                         rc = try_to_identify(drive,cmd);
 463                 }
 464                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 465                         return 4;
 466
 467                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 468                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 469                         (drive->autotune == IDE_TUNE_AUTO))) {
 470                         unsigned long timeout;
 471                         printk("%s: no response (status = 0x%02x), "
 472                                 "resetting drive\n", drive->name,
 473                                 hwif->INB(IDE_STATUS_REG));
 474                         msleep(50);
 475                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 476                         msleep(50);
 477                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 478                         timeout = jiffies;
 479                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
 480                                time_before(jiffies, timeout + WAIT_WORSTCASE))
 481                                 msleep(50);
 482                         rc = try_to_identify(drive, cmd);
 483                 }
 484                 if (rc == 1)
 485                         printk("%s: no response (status = 0x%02x)\n",
 486                                 drive->name, hwif->INB(IDE_STATUS_REG));
 487                 /* ensure drive irq is clear */
 488                 (void) hwif->INB(IDE_STATUS_REG);
 489         } else {
 490                 /* not present or maybe ATAPI */
 491                 rc = 3;
 492         }
 493         if (drive->select.b.unit != 0) {
 494                 /* exit with drive0 selected */
 495                 SELECT_DRIVE(&hwif->drives[0]);
 496                 msleep(50);
 497                 /* ensure drive irq is clear */
 498                 (void) hwif->INB(IDE_STATUS_REG);
 499         }
 500         return rc;
 501 }
 502
 503 /*
 504  *
 505  */
 506 static void enable_nest (ide_drive_t *drive)
 507 {
 508         ide_hwif_t *hwif = HWIF(drive);
 509         unsigned long timeout;
 510
 511         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 512         SELECT_DRIVE(drive);
 513         msleep(50);
 514         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 515         timeout = jiffies + WAIT_WORSTCASE;
 516         do {
 517                 if (time_after(jiffies, timeout)) {
 518                         printk("failed (timeout)\n");
 519                         return;
 520                 }
 521                 msleep(50);
 522         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 523
 524         msleep(50);
 525
 526         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 527                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 528         } else {
 529                 printk("success\n");
 530         }
 531
 532         /* if !(success||timed-out) */
 533         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 534                 /* look for ATAPI device */
 535                 (void) do_probe(drive, WIN_PIDENTIFY);
 536         }
 537 }
 538
 539 /**
 540  *      probe_for_drives        -       upper level drive probe
 541  *      @drive: drive to probe for
 542  *
 543  *      probe_for_drive() tests for existence of a given drive using do_probe()
 544  *      and presents things to the user as needed.
 545  *
 546  *      Returns:        0  no device was found
 547  *                      1  device was found (note: drive->present might
 548  *                         still be 0)
 549  */
 550
 551 static inline u8 probe_for_drive (ide_drive_t *drive)
 552 {
 553         /*
 554          *      In order to keep things simple we have an id
 555          *      block for all drives at all times. If the device
 556          *      is pre ATA or refuses ATA/ATAPI identify we
 557          *      will add faked data to this.
 558          *
 559          *      Also note that 0 everywhere means "can't do X"
 560          */
 561
 562         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 563         drive->id_read = 0;
 564         if(drive->id == NULL)
 565         {
 566                 printk(KERN_ERR "ide: out of memory for id data.\n");
 567                 return 0;
 568         }
 569         strcpy(drive->id->model, "UNKNOWN");
 570
 571         /* skip probing? */
 572         if (!drive->noprobe)
 573         {
 574                 /* if !(success||timed-out) */
 575                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 576                         /* look for ATAPI device */
 577                         (void) do_probe(drive, WIN_PIDENTIFY);
 578                 }
 579                 if (!drive->present)
 580                         /* drive not found */
 581                         return 0;
 582                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 583                         enable_nest(drive);
 584
 585                 /* identification failed? */
 586                 if (!drive->id_read) {
 587                         if (drive->media == ide_disk) {
 588                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 589                                         drive->name, drive->cyl,
 590                                         drive->head, drive->sect);
 591                         } else if (drive->media == ide_cdrom) {
 592                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 593                         } else {
 594                                 /* nuke it */
 595                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 596                                 drive->present = 0;
 597                         }
 598                 }
 599                 /* drive was found */
 600         }
 601         if(!drive->present)
 602                 return 0;
 603         /* The drive wasn't being helpful. Add generic info only */
 604         if (drive->id_read == 0) {
 605                 generic_id(drive);
 606                 return 1;
 607         }
 608
 609         if (drive->media == ide_disk) {
 610                 ide_disk_init_chs(drive);
 611                 ide_disk_init_mult_count(drive);
 612         }
 613
 614         return drive->present;
 615 }
 616
 617 static void hwif_release_dev (struct device *dev)
 618 {
 619         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 620
 621         complete(&hwif->gendev_rel_comp);
 622 }
 623
 624 static void hwif_register (ide_hwif_t *hwif)
 625 {
 626         int ret;
 627
 628         /* register with global device tree */
 629         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 630         hwif->gendev.driver_data = hwif;
 631         if (hwif->gendev.parent == NULL) {
 632                 if (hwif->pci_dev)
 633                         hwif->gendev.parent = &hwif->pci_dev->dev;
 634                 else
 635                         /* Would like to do = &device_legacy */
 636                         hwif->gendev.parent = NULL;
 637         }
 638         hwif->gendev.release = hwif_release_dev;
 639         ret = device_register(&hwif->gendev);
 640         if (ret < 0)
 641                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 642                         __FUNCTION__, ret);
 643 }
 644
 645 static int wait_hwif_ready(ide_hwif_t *hwif)
 646 {
 647         int rc;
 648
 649         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 650
 651         /* Let HW settle down a bit from whatever init state we
 652          * come from */
 653         mdelay(2);
 654
 655         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 656          * I know of at least one disk who takes 31 seconds, I use 35
 657          * here to be safe
 658          */
 659         rc = ide_wait_not_busy(hwif, 35000);
 660         if (rc)
 661                 return rc;
 662
 663         /* Now make sure both master & slave are ready */
 664         SELECT_DRIVE(&hwif->drives[0]);
 665         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 666         mdelay(2);
 667         rc = ide_wait_not_busy(hwif, 35000);
 668         if (rc)
 669                 return rc;
 670         SELECT_DRIVE(&hwif->drives[1]);
 671         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 672         mdelay(2);
 673         rc = ide_wait_not_busy(hwif, 35000);
 674
 675         /* Exit function with master reselected (let's be sane) */
 676         SELECT_DRIVE(&hwif->drives[0]);
 677
 678         return rc;
 679 }
 680
 681 /**
 682  *      ide_undecoded_slave     -       look for bad CF adapters
 683  *      @hwif: interface
 684  *
 685  *      Analyse the drives on the interface and attempt to decide if we
 686  *      have the same drive viewed twice. This occurs with crap CF adapters
 687  *      and PCMCIA sometimes.
 688  */
 689
 690 void ide_undecoded_slave(ide_hwif_t *hwif)
 691 {
 692         ide_drive_t *drive0 = &hwif->drives[0];
 693         ide_drive_t *drive1 = &hwif->drives[1];
 694
 695         if (drive0->present == 0 || drive1->present == 0)
 696                 return;
 697
 698         /* If the models don't match they are not the same product */
 699         if (strcmp(drive0->id->model, drive1->id->model))
 700                 return;
 701
 702         /* Serial numbers do not match */
 703         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 704                 return;
 705
 706         /* No serial number, thankfully very rare for CF */
 707         if (drive0->id->serial_no[0] == 0)
 708                 return;
 709
 710         /* Appears to be an IDE flash adapter with decode bugs */
 711         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 712
 713         drive1->present = 0;
 714 }
 715
 716 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 717
 718 /*
 719  * This routine only knows how to look for drive units 0 and 1
 720  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 721  */
 722 static void probe_hwif(ide_hwif_t *hwif)
 723 {
 724         unsigned long flags;
 725         unsigned int irqd;
 726         int unit;
 727
 728         if (hwif->noprobe)
 729                 return;
 730
 731         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 732             (ide_hwif_request_regions(hwif))) {
 733                 u16 msgout = 0;
 734                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 735                         ide_drive_t *drive = &hwif->drives[unit];
 736                         if (drive->present) {
 737                                 drive->present = 0;
 738                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 739                                         drive->name);
 740                                 msgout = 1;
 741                         }
 742                 }
 743                 if (!msgout)
 744                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 745                                 hwif->name);
 746                 return;
 747         }
 748
 749         /*
 750          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 751          * we'll install our IRQ driver much later...
 752          */
 753         irqd = hwif->irq;
 754         if (irqd)
 755                 disable_irq(hwif->irq);
 756
 757         local_irq_set(flags);
 758
 759         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 760          * platforms. Typical cases are:
 761          *
 762          *  - The firmware hard reset the disk before booting the kernel,
 763          *    the drive is still doing it's poweron-reset sequence, that
 764          *    can take up to 30 seconds
 765          *  - The firmware does nothing (or no firmware), the device is
 766          *    still in POST state (same as above actually).
 767          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 768          *    their reset sequence even when they are non-selected slave
 769          *    devices, thus preventing discovery of the main HD
 770          *
 771          *  Doing this wait-for-busy should not harm any existing configuration
 772          *  (at least things won't be worse than what current code does, that
 773          *  is blindly go & talk to the drive) and fix some issues like the
 774          *  above.
 775          *
 776          *  BenH.
 777          */
 778         if (wait_hwif_ready(hwif) == -EBUSY)
 779                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 780
 781         /*
 782          * Need to probe slave device first to make it release PDIAG-.
 783          */
 784         for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
 785                 ide_drive_t *drive = &hwif->drives[unit];
 786                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 787                 (void) probe_for_drive(drive);
 788                 if (drive->present && !hwif->present) {
 789                         hwif->present = 1;
 790                         if (hwif->chipset != ide_4drives ||
 791                             !hwif->mate ||
 792                             !hwif->mate->present) {
 793                                 hwif_register(hwif);
 794                         }
 795                 }
 796         }
 797         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 798                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 799                 u8 stat;
 800
 801                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 802                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 803                 udelay(10);
 804                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 805                 do {
 806                         msleep(50);
 807                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 808                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 809
 810         }
 811         local_irq_restore(flags);
 812         /*
 813          * Use cached IRQ number. It might be (and is...) changed by probe
 814          * code above
 815          */
 816         if (irqd)
 817                 enable_irq(irqd);
 818
 819         if (!hwif->present) {
 820                 ide_hwif_release_regions(hwif);
 821                 return;
 822         }
 823
 824         if (hwif->fixup)
 825                 hwif->fixup(hwif);
 826
 827         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 828                 ide_drive_t *drive = &hwif->drives[unit];
 829
 830                 if (drive->present) {
 831                         if (drive->autotune == IDE_TUNE_AUTO)
 832                                 ide_set_max_pio(drive);
 833
 834                         if (drive->autotune != IDE_TUNE_DEFAULT &&
 835                             drive->autotune != IDE_TUNE_AUTO)
 836                                 continue;
 837
 838                         drive->nice1 = 1;
 839
 840                         if (hwif->ide_dma_on) {
 841                                 /*
 842                                  * Force DMAing for the beginning of the check.
 843                                  * Some chipsets appear to do interesting
 844                                  * things, if not checked and cleared.
 845                                  *   PARANOIA!!!
 846                                  */
 847                                 hwif->dma_off_quietly(drive);
 848                                 ide_set_dma(drive);
 849                         }
 850                 }
 851         }
 852
 853         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 854                 ide_drive_t *drive = &hwif->drives[unit];
 855
 856                 if (hwif->no_io_32bit)
 857                         drive->no_io_32bit = 1;
 858                 else
 859                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 860         }
 861 }
 862
 863 static int hwif_init(ide_hwif_t *hwif);
 864 static void hwif_register_devices(ide_hwif_t *hwif);
 865
 866 static int probe_hwif_init(ide_hwif_t *hwif)
 867 {
 868         probe_hwif(hwif);
 869
 870         if (!hwif_init(hwif)) {
 871                 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
 872                                  hwif->name);
 873                 return -1;
 874         }
 875
 876         if (hwif->present)
 877                 hwif_register_devices(hwif);
 878
 879         return 0;
 880 }
 881
 882 #if MAX_HWIFS > 1
 883 /*
 884  * save_match() is used to simplify logic in init_irq() below.
 885  *
 886  * A loophole here is that we may not know about a particular
 887  * hwif's irq until after that hwif is actually probed/initialized..
 888  * This could be a problem for the case where an hwif is on a
 889  * dual interface that requires serialization (eg. cmd640) and another
 890  * hwif using one of the same irqs is initialized beforehand.
 891  *
 892  * This routine detects and reports such situations, but does not fix them.
 893  */
 894 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 895 {
 896         ide_hwif_t *m = *match;
 897
 898         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 899                 if (!new->hwgroup)
 900                         return;
 901                 printk("%s: potential irq problem with %s and %s\n",
 902                         hwif->name, new->name, m->name);
 903         }
 904         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 905                 *match = new;
 906 }
 907 #endif /* MAX_HWIFS > 1 */
 908
 909 /*
 910  * init request queue
 911  */
 912 static int ide_init_queue(ide_drive_t *drive)
 913 {
 914         struct request_queue *q;
 915         ide_hwif_t *hwif = HWIF(drive);
 916         int max_sectors = 256;
 917         int max_sg_entries = PRD_ENTRIES;
 918
 919         /*
 920          *      Our default set up assumes the normal IDE case,
 921          *      that is 64K segmenting, standard PRD setup
 922          *      and LBA28. Some drivers then impose their own
 923          *      limits and LBA48 we could raise it but as yet
 924          *      do not.
 925          */
 926
 927         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 928         if (!q)
 929                 return 1;
 930
 931         q->queuedata = drive;
 932         blk_queue_segment_boundary(q, 0xffff);
 933
 934         if (!hwif->rqsize) {
 935                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
 936                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
 937                         hwif->rqsize = 256;
 938                 else
 939                         hwif->rqsize = 65536;
 940         }
 941         if (hwif->rqsize < max_sectors)
 942                 max_sectors = hwif->rqsize;
 943         blk_queue_max_sectors(q, max_sectors);
 944
 945 #ifdef CONFIG_PCI
 946         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 947          * creates segments that don't completely match our boundary
 948          * requirements and thus need to be broken up again. Because it
 949          * doesn't align properly either, we may actually have to break up
 950          * to more segments than what was we got in the first place, a max
 951          * worst case is twice as many.
 952          * This will be fixed once we teach pci_map_sg() about our boundary
 953          * requirements, hopefully soon. *FIXME*
 954          */
 955         if (!PCI_DMA_BUS_IS_PHYS)
 956                 max_sg_entries >>= 1;
 957 #endif /* CONFIG_PCI */
 958
 959         blk_queue_max_hw_segments(q, max_sg_entries);
 960         blk_queue_max_phys_segments(q, max_sg_entries);
 961
 962         /* assign drive queue */
 963         drive->queue = q;
 964
 965         /* needs drive->queue to be set */
 966         ide_toggle_bounce(drive, 1);
 967
 968         return 0;
 969 }
 970
 971 /*
 972  * This routine sets up the irq for an ide interface, and creates a new
 973  * hwgroup for the irq/hwif if none was previously assigned.
 974  *
 975  * Much of the code is for correctly detecting/handling irq sharing
 976  * and irq serialization situations.  This is somewhat complex because
 977  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 978  *
 979  * The IRQF_DISABLED in sa_flags means ide_intr() is always entered with
 980  * interrupts completely disabled.  This can be bad for interrupt latency,
 981  * but anything else has led to problems on some machines.  We re-enable
 982  * interrupts as much as we can safely do in most places.
 983  */
 984 static int init_irq (ide_hwif_t *hwif)
 985 {
 986         unsigned int index;
 987         ide_hwgroup_t *hwgroup;
 988         ide_hwif_t *match = NULL;
 989
 990
 991         BUG_ON(in_interrupt());
 992         BUG_ON(irqs_disabled());
 993         BUG_ON(hwif == NULL);
 994
 995         mutex_lock(&ide_cfg_mtx);
 996         hwif->hwgroup = NULL;
 997 #if MAX_HWIFS > 1
 998         /*
 999          * Group up with any other hwifs that share our irq(s).
1000          */
1001         for (index = 0; index < MAX_HWIFS; index++) {
1002                 ide_hwif_t *h = &ide_hwifs[index];
1003                 if (h->hwgroup) {  /* scan only initialized hwif's */
1004                         if (hwif->irq == h->irq) {
1005                                 hwif->sharing_irq = h->sharing_irq = 1;
1006                                 if (hwif->chipset != ide_pci ||
1007                                     h->chipset != ide_pci) {
1008                                         save_match(hwif, h, &match);
1009                                 }
1010                         }
1011                         if (hwif->serialized) {
1012                                 if (hwif->mate && hwif->mate->irq == h->irq)
1013                                         save_match(hwif, h, &match);
1014                         }
1015                         if (h->serialized) {
1016                                 if (h->mate && hwif->irq == h->mate->irq)
1017                                         save_match(hwif, h, &match);
1018                         }
1019                 }
1020         }
1021 #endif /* MAX_HWIFS > 1 */
1022         /*
1023          * If we are still without a hwgroup, then form a new one
1024          */
1025         if (match) {
1026                 hwgroup = match->hwgroup;
1027                 hwif->hwgroup = hwgroup;
1028                 /*
1029                  * Link us into the hwgroup.
1030                  * This must be done early, do ensure that unexpected_intr
1031                  * can find the hwif and prevent irq storms.
1032                  * No drives are attached to the new hwif, choose_drive
1033                  * can't do anything stupid (yet).
1034                  * Add ourself as the 2nd entry to the hwgroup->hwif
1035                  * linked list, the first entry is the hwif that owns
1036                  * hwgroup->handler - do not change that.
1037                  */
1038                 spin_lock_irq(&ide_lock);
1039                 hwif->next = hwgroup->hwif->next;
1040                 hwgroup->hwif->next = hwif;
1041                 spin_unlock_irq(&ide_lock);
1042         } else {
1043                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1044                                         GFP_KERNEL | __GFP_ZERO,
1045                                         hwif_to_node(hwif->drives[0].hwif));
1046                 if (!hwgroup)
1047                         goto out_up;
1048
1049                 hwif->hwgroup = hwgroup;
1050
1051                 hwgroup->hwif     = hwif->next = hwif;
1052                 hwgroup->rq       = NULL;
1053                 hwgroup->handler  = NULL;
1054                 hwgroup->drive    = NULL;
1055                 hwgroup->busy     = 0;
1056                 init_timer(&hwgroup->timer);
1057                 hwgroup->timer.function = &ide_timer_expiry;
1058                 hwgroup->timer.data = (unsigned long) hwgroup;
1059         }
1060
1061         /*
1062          * Allocate the irq, if not already obtained for another hwif
1063          */
1064         if (!match || match->irq != hwif->irq) {
1065                 int sa = IRQF_DISABLED;
1066 #if defined(__mc68000__) || defined(CONFIG_APUS)
1067                 sa = IRQF_SHARED;
1068 #endif /* __mc68000__ || CONFIG_APUS */
1069
1070                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1071                         sa = IRQF_SHARED;
1072 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1073                         sa |= IRQF_DISABLED;
1074 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1075                 }
1076
1077                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1078                         /* clear nIEN */
1079                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1080
1081                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1082                         goto out_unlink;
1083         }
1084
1085         /*
1086          * For any present drive:
1087          * - allocate the block device queue
1088          * - link drive into the hwgroup
1089          */
1090         for (index = 0; index < MAX_DRIVES; ++index) {
1091                 ide_drive_t *drive = &hwif->drives[index];
1092                 if (!drive->present)
1093                         continue;
1094                 if (ide_init_queue(drive)) {
1095                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1096                         continue;
1097                 }
1098                 spin_lock_irq(&ide_lock);
1099                 if (!hwgroup->drive) {
1100                         /* first drive for hwgroup. */
1101                         drive->next = drive;
1102                         hwgroup->drive = drive;
1103                         hwgroup->hwif = HWIF(hwgroup->drive);
1104                 } else {
1105                         drive->next = hwgroup->drive->next;
1106                         hwgroup->drive->next = drive;
1107                 }
1108                 spin_unlock_irq(&ide_lock);
1109         }
1110
1111 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1112         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1113                 hwif->io_ports[IDE_DATA_OFFSET],
1114                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1115                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1116 #else
1117         printk("%s at 0x%08lx on irq %d", hwif->name,
1118                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1119 #endif /* __mc68000__ && CONFIG_APUS */
1120         if (match)
1121                 printk(" (%sed with %s)",
1122                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1123         printk("\n");
1124         mutex_unlock(&ide_cfg_mtx);
1125         return 0;
1126 out_unlink:
1127         spin_lock_irq(&ide_lock);
1128         if (hwif->next == hwif) {
1129                 BUG_ON(match);
1130                 BUG_ON(hwgroup->hwif != hwif);
1131                 kfree(hwgroup);
1132         } else {
1133                 ide_hwif_t *g;
1134                 g = hwgroup->hwif;
1135                 while (g->next != hwif)
1136                         g = g->next;
1137                 g->next = hwif->next;
1138                 if (hwgroup->hwif == hwif) {
1139                         /* Impossible. */
1140                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1141                         hwgroup->hwif = g;
1142                 }
1143                 BUG_ON(hwgroup->hwif == hwif);
1144         }
1145         spin_unlock_irq(&ide_lock);
1146 out_up:
1147         mutex_unlock(&ide_cfg_mtx);
1148         return 1;
1149 }
1150
1151 static int ata_lock(dev_t dev, void *data)
1152 {
1153         /* FIXME: we want to pin hwif down */
1154         return 0;
1155 }
1156
1157 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1158 {
1159         ide_hwif_t *hwif = data;
1160         int unit = *part >> PARTN_BITS;
1161         ide_drive_t *drive = &hwif->drives[unit];
1162         if (!drive->present)
1163                 return NULL;
1164
1165         if (drive->media == ide_disk)
1166                 request_module("ide-disk");
1167         if (drive->scsi)
1168                 request_module("ide-scsi");
1169         if (drive->media == ide_cdrom || drive->media == ide_optical)
1170                 request_module("ide-cd");
1171         if (drive->media == ide_tape)
1172                 request_module("ide-tape");
1173         if (drive->media == ide_floppy)
1174                 request_module("ide-floppy");
1175
1176         return NULL;
1177 }
1178
1179 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1180 {
1181         struct gendisk *p = data;
1182         *part &= (1 << PARTN_BITS) - 1;
1183         return &p->kobj;
1184 }
1185
1186 static int exact_lock(dev_t dev, void *data)
1187 {
1188         struct gendisk *p = data;
1189
1190         if (!get_disk(p))
1191                 return -1;
1192         return 0;
1193 }
1194
1195 void ide_register_region(struct gendisk *disk)
1196 {
1197         blk_register_region(MKDEV(disk->major, disk->first_minor),
1198                             disk->minors, NULL, exact_match, exact_lock, disk);
1199 }
1200
1201 EXPORT_SYMBOL_GPL(ide_register_region);
1202
1203 void ide_unregister_region(struct gendisk *disk)
1204 {
1205         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1206                               disk->minors);
1207 }
1208
1209 EXPORT_SYMBOL_GPL(ide_unregister_region);
1210
1211 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1212 {
1213         ide_hwif_t *hwif = drive->hwif;
1214         unsigned int unit = (drive->select.all >> 4) & 1;
1215
1216         disk->major = hwif->major;
1217         disk->first_minor = unit << PARTN_BITS;
1218         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1219         disk->queue = drive->queue;
1220 }
1221
1222 EXPORT_SYMBOL_GPL(ide_init_disk);
1223
1224 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1225 {
1226         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1227
1228         if (drive == drive->next) {
1229                 /* special case: last drive from hwgroup. */
1230                 BUG_ON(hwgroup->drive != drive);
1231                 hwgroup->drive = NULL;
1232         } else {
1233                 ide_drive_t *walk;
1234
1235                 walk = hwgroup->drive;
1236                 while (walk->next != drive)
1237                         walk = walk->next;
1238                 walk->next = drive->next;
1239                 if (hwgroup->drive == drive) {
1240                         hwgroup->drive = drive->next;
1241                         hwgroup->hwif = hwgroup->drive->hwif;
1242                 }
1243         }
1244         BUG_ON(hwgroup->drive == drive);
1245 }
1246
1247 static void drive_release_dev (struct device *dev)
1248 {
1249         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1250
1251         spin_lock_irq(&ide_lock);
1252         ide_remove_drive_from_hwgroup(drive);
1253         kfree(drive->id);
1254         drive->id = NULL;
1255         drive->present = 0;
1256         /* Messed up locking ... */
1257         spin_unlock_irq(&ide_lock);
1258         blk_cleanup_queue(drive->queue);
1259         spin_lock_irq(&ide_lock);
1260         drive->queue = NULL;
1261         spin_unlock_irq(&ide_lock);
1262
1263         complete(&drive->gendev_rel_comp);
1264 }
1265
1266 /*
1267  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1268  * after probing for drives, to allocate partition tables and other data
1269  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1270  * somewhat later, during the partition check.
1271  */
1272 static void init_gendisk (ide_hwif_t *hwif)
1273 {
1274         unsigned int unit;
1275
1276         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1277                 ide_drive_t * drive = &hwif->drives[unit];
1278                 ide_add_generic_settings(drive);
1279                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1280                          hwif->index,unit);
1281                 drive->gendev.parent = &hwif->gendev;
1282                 drive->gendev.bus = &ide_bus_type;
1283                 drive->gendev.driver_data = drive;
1284                 drive->gendev.release = drive_release_dev;
1285         }
1286         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1287                         THIS_MODULE, ata_probe, ata_lock, hwif);
1288 }
1289
1290 static int hwif_init(ide_hwif_t *hwif)
1291 {
1292         int old_irq;
1293
1294         /* Return success if no device is connected */
1295         if (!hwif->present)
1296                 return 1;
1297
1298         if (!hwif->irq) {
1299                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1300                 {
1301                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1302                         return (hwif->present = 0);
1303                 }
1304         }
1305 #ifdef CONFIG_BLK_DEV_HD
1306         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1307                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1308                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1309                 return (hwif->present = 0);
1310         }
1311 #endif /* CONFIG_BLK_DEV_HD */
1312
1313         /* we set it back to 1 if all is ok below */
1314         hwif->present = 0;
1315
1316         if (register_blkdev(hwif->major, hwif->name))
1317                 return 0;
1318
1319         if (!hwif->sg_max_nents)
1320                 hwif->sg_max_nents = PRD_ENTRIES;
1321
1322         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1323                                  GFP_KERNEL);
1324         if (!hwif->sg_table) {
1325                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1326                 goto out;
1327         }
1328
1329         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1330
1331         if (init_irq(hwif) == 0)
1332                 goto done;
1333
1334         old_irq = hwif->irq;
1335         /*
1336          *      It failed to initialise. Find the default IRQ for
1337          *      this port and try that.
1338          */
1339         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1340                 printk("%s: Disabled unable to get IRQ %d.\n",
1341                         hwif->name, old_irq);
1342                 goto out;
1343         }
1344         if (init_irq(hwif)) {
1345                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1346                         hwif->name, old_irq, hwif->irq);
1347                 goto out;
1348         }
1349         printk("%s: probed IRQ %d failed, using default.\n",
1350                 hwif->name, hwif->irq);
1351
1352 done:
1353         init_gendisk(hwif);
1354
1355         ide_acpi_init(hwif);
1356
1357         hwif->present = 1;      /* success */
1358         return 1;
1359
1360 out:
1361         unregister_blkdev(hwif->major, hwif->name);
1362         return 0;
1363 }
1364
1365 static void hwif_register_devices(ide_hwif_t *hwif)
1366 {
1367         unsigned int i;
1368
1369         for (i = 0; i < MAX_DRIVES; i++) {
1370                 ide_drive_t *drive = &hwif->drives[i];
1371
1372                 if (drive->present) {
1373                         int ret = device_register(&drive->gendev);
1374
1375                         if (ret < 0)
1376                                 printk(KERN_WARNING "IDE: %s: "
1377                                         "device_register error: %d\n",
1378                                         __FUNCTION__, ret);
1379                 }
1380         }
1381 }
1382
1383 int ideprobe_init (void)
1384 {
1385         unsigned int index;
1386         int probe[MAX_HWIFS];
1387
1388         memset(probe, 0, MAX_HWIFS * sizeof(int));
1389         for (index = 0; index < MAX_HWIFS; ++index)
1390                 probe[index] = !ide_hwifs[index].present;
1391
1392         for (index = 0; index < MAX_HWIFS; ++index)
1393                 if (probe[index])
1394                         probe_hwif(&ide_hwifs[index]);
1395         for (index = 0; index < MAX_HWIFS; ++index)
1396                 if (probe[index])
1397                         hwif_init(&ide_hwifs[index]);
1398         for (index = 0; index < MAX_HWIFS; ++index) {
1399                 if (probe[index]) {
1400                         ide_hwif_t *hwif = &ide_hwifs[index];
1401                         if (!hwif->present)
1402                                 continue;
1403                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1404                                 hwif->chipset = ide_generic;
1405                         hwif_register_devices(hwif);
1406                 }
1407         }
1408         for (index = 0; index < MAX_HWIFS; ++index)
1409                 if (probe[index])
1410                         ide_proc_register_port(&ide_hwifs[index]);
1411         return 0;
1412 }
1413
1414 EXPORT_SYMBOL_GPL(ideprobe_init);
1415
1416 int ide_device_add(u8 idx[4])
1417 {
1418         int i, rc = 0;
1419
1420         for (i = 0; i < 4; i++) {
1421                 if (idx[i] != 0xff)
1422                         rc |= probe_hwif_init(&ide_hwifs[idx[i]]);
1423         }
1424
1425         for (i = 0; i < 4; i++) {
1426                 if (idx[i] != 0xff)
1427                         ide_proc_register_port(&ide_hwifs[idx[i]]);
1428         }
1429
1430         return rc;
1431 }
1432
1433 EXPORT_SYMBOL_GPL(ide_device_add);