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 unit, 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         for (unit = 0; unit < MAX_DRIVES; unit++) {
 665                 ide_drive_t *drive = &hwif->drives[unit];
 666
 667                 /* Ignore disks that we will not probe for later. */
 668                 if (!drive->noprobe || drive->present) {
 669                         SELECT_DRIVE(drive);
 670                         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 671                         mdelay(2);
 672                         rc = ide_wait_not_busy(hwif, 35000);
 673                         if (rc)
 674                                 goto out;
 675                 } else
 676                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 677                                           drive->name);
 678         }
 679 out:
 680         /* Exit function with master reselected (let's be sane) */
 681         if (unit)
 682                 SELECT_DRIVE(&hwif->drives[0]);
 683
 684         return rc;
 685 }
 686
 687 /**
 688  *      ide_undecoded_slave     -       look for bad CF adapters
 689  *      @hwif: interface
 690  *
 691  *      Analyse the drives on the interface and attempt to decide if we
 692  *      have the same drive viewed twice. This occurs with crap CF adapters
 693  *      and PCMCIA sometimes.
 694  */
 695
 696 void ide_undecoded_slave(ide_hwif_t *hwif)
 697 {
 698         ide_drive_t *drive0 = &hwif->drives[0];
 699         ide_drive_t *drive1 = &hwif->drives[1];
 700
 701         if (drive0->present == 0 || drive1->present == 0)
 702                 return;
 703
 704         /* If the models don't match they are not the same product */
 705         if (strcmp(drive0->id->model, drive1->id->model))
 706                 return;
 707
 708         /* Serial numbers do not match */
 709         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 710                 return;
 711
 712         /* No serial number, thankfully very rare for CF */
 713         if (drive0->id->serial_no[0] == 0)
 714                 return;
 715
 716         /* Appears to be an IDE flash adapter with decode bugs */
 717         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 718
 719         drive1->present = 0;
 720 }
 721
 722 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 723
 724 /*
 725  * This routine only knows how to look for drive units 0 and 1
 726  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 727  */
 728 static void probe_hwif(ide_hwif_t *hwif)
 729 {
 730         unsigned long flags;
 731         unsigned int irqd;
 732         int unit;
 733
 734         if (hwif->noprobe)
 735                 return;
 736
 737         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 738             (ide_hwif_request_regions(hwif))) {
 739                 u16 msgout = 0;
 740                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 741                         ide_drive_t *drive = &hwif->drives[unit];
 742                         if (drive->present) {
 743                                 drive->present = 0;
 744                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 745                                         drive->name);
 746                                 msgout = 1;
 747                         }
 748                 }
 749                 if (!msgout)
 750                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 751                                 hwif->name);
 752                 return;
 753         }
 754
 755         /*
 756          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 757          * we'll install our IRQ driver much later...
 758          */
 759         irqd = hwif->irq;
 760         if (irqd)
 761                 disable_irq(hwif->irq);
 762
 763         local_irq_set(flags);
 764
 765         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 766          * platforms. Typical cases are:
 767          *
 768          *  - The firmware hard reset the disk before booting the kernel,
 769          *    the drive is still doing it's poweron-reset sequence, that
 770          *    can take up to 30 seconds
 771          *  - The firmware does nothing (or no firmware), the device is
 772          *    still in POST state (same as above actually).
 773          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 774          *    their reset sequence even when they are non-selected slave
 775          *    devices, thus preventing discovery of the main HD
 776          *
 777          *  Doing this wait-for-busy should not harm any existing configuration
 778          *  (at least things won't be worse than what current code does, that
 779          *  is blindly go & talk to the drive) and fix some issues like the
 780          *  above.
 781          *
 782          *  BenH.
 783          */
 784         if (wait_hwif_ready(hwif) == -EBUSY)
 785                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 786
 787         /*
 788          * Need to probe slave device first to make it release PDIAG-.
 789          */
 790         for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
 791                 ide_drive_t *drive = &hwif->drives[unit];
 792                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 793                 (void) probe_for_drive(drive);
 794                 if (drive->present && !hwif->present) {
 795                         hwif->present = 1;
 796                         if (hwif->chipset != ide_4drives ||
 797                             !hwif->mate ||
 798                             !hwif->mate->present) {
 799                                 hwif_register(hwif);
 800                         }
 801                 }
 802         }
 803         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 804                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 805                 u8 stat;
 806
 807                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 808                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 809                 udelay(10);
 810                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 811                 do {
 812                         msleep(50);
 813                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 814                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 815
 816         }
 817         local_irq_restore(flags);
 818         /*
 819          * Use cached IRQ number. It might be (and is...) changed by probe
 820          * code above
 821          */
 822         if (irqd)
 823                 enable_irq(irqd);
 824
 825         if (!hwif->present) {
 826                 ide_hwif_release_regions(hwif);
 827                 return;
 828         }
 829
 830         if (hwif->fixup)
 831                 hwif->fixup(hwif);
 832
 833         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 834                 ide_drive_t *drive = &hwif->drives[unit];
 835
 836                 if (drive->present) {
 837                         if (drive->autotune == IDE_TUNE_AUTO)
 838                                 ide_set_max_pio(drive);
 839
 840                         if (drive->autotune != IDE_TUNE_DEFAULT &&
 841                             drive->autotune != IDE_TUNE_AUTO)
 842                                 continue;
 843
 844                         drive->nice1 = 1;
 845
 846                         if (hwif->ide_dma_on) {
 847                                 /*
 848                                  * Force DMAing for the beginning of the check.
 849                                  * Some chipsets appear to do interesting
 850                                  * things, if not checked and cleared.
 851                                  *   PARANOIA!!!
 852                                  */
 853                                 hwif->dma_off_quietly(drive);
 854                                 ide_set_dma(drive);
 855                         }
 856                 }
 857         }
 858
 859         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 860                 ide_drive_t *drive = &hwif->drives[unit];
 861
 862                 if (hwif->no_io_32bit)
 863                         drive->no_io_32bit = 1;
 864                 else
 865                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 866         }
 867 }
 868
 869 static int hwif_init(ide_hwif_t *hwif);
 870 static void hwif_register_devices(ide_hwif_t *hwif);
 871
 872 static int probe_hwif_init(ide_hwif_t *hwif)
 873 {
 874         probe_hwif(hwif);
 875
 876         if (!hwif_init(hwif)) {
 877                 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
 878                                  hwif->name);
 879                 return -1;
 880         }
 881
 882         if (hwif->present)
 883                 hwif_register_devices(hwif);
 884
 885         return 0;
 886 }
 887
 888 #if MAX_HWIFS > 1
 889 /*
 890  * save_match() is used to simplify logic in init_irq() below.
 891  *
 892  * A loophole here is that we may not know about a particular
 893  * hwif's irq until after that hwif is actually probed/initialized..
 894  * This could be a problem for the case where an hwif is on a
 895  * dual interface that requires serialization (eg. cmd640) and another
 896  * hwif using one of the same irqs is initialized beforehand.
 897  *
 898  * This routine detects and reports such situations, but does not fix them.
 899  */
 900 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 901 {
 902         ide_hwif_t *m = *match;
 903
 904         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 905                 if (!new->hwgroup)
 906                         return;
 907                 printk("%s: potential irq problem with %s and %s\n",
 908                         hwif->name, new->name, m->name);
 909         }
 910         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 911                 *match = new;
 912 }
 913 #endif /* MAX_HWIFS > 1 */
 914
 915 /*
 916  * init request queue
 917  */
 918 static int ide_init_queue(ide_drive_t *drive)
 919 {
 920         struct request_queue *q;
 921         ide_hwif_t *hwif = HWIF(drive);
 922         int max_sectors = 256;
 923         int max_sg_entries = PRD_ENTRIES;
 924
 925         /*
 926          *      Our default set up assumes the normal IDE case,
 927          *      that is 64K segmenting, standard PRD setup
 928          *      and LBA28. Some drivers then impose their own
 929          *      limits and LBA48 we could raise it but as yet
 930          *      do not.
 931          */
 932
 933         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 934         if (!q)
 935                 return 1;
 936
 937         q->queuedata = drive;
 938         blk_queue_segment_boundary(q, 0xffff);
 939
 940         if (!hwif->rqsize) {
 941                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
 942                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
 943                         hwif->rqsize = 256;
 944                 else
 945                         hwif->rqsize = 65536;
 946         }
 947         if (hwif->rqsize < max_sectors)
 948                 max_sectors = hwif->rqsize;
 949         blk_queue_max_sectors(q, max_sectors);
 950
 951 #ifdef CONFIG_PCI
 952         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 953          * creates segments that don't completely match our boundary
 954          * requirements and thus need to be broken up again. Because it
 955          * doesn't align properly either, we may actually have to break up
 956          * to more segments than what was we got in the first place, a max
 957          * worst case is twice as many.
 958          * This will be fixed once we teach pci_map_sg() about our boundary
 959          * requirements, hopefully soon. *FIXME*
 960          */
 961         if (!PCI_DMA_BUS_IS_PHYS)
 962                 max_sg_entries >>= 1;
 963 #endif /* CONFIG_PCI */
 964
 965         blk_queue_max_hw_segments(q, max_sg_entries);
 966         blk_queue_max_phys_segments(q, max_sg_entries);
 967
 968         /* assign drive queue */
 969         drive->queue = q;
 970
 971         /* needs drive->queue to be set */
 972         ide_toggle_bounce(drive, 1);
 973
 974         return 0;
 975 }
 976
 977 /*
 978  * This routine sets up the irq for an ide interface, and creates a new
 979  * hwgroup for the irq/hwif if none was previously assigned.
 980  *
 981  * Much of the code is for correctly detecting/handling irq sharing
 982  * and irq serialization situations.  This is somewhat complex because
 983  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 984  *
 985  * The IRQF_DISABLED in sa_flags means ide_intr() is always entered with
 986  * interrupts completely disabled.  This can be bad for interrupt latency,
 987  * but anything else has led to problems on some machines.  We re-enable
 988  * interrupts as much as we can safely do in most places.
 989  */
 990 static int init_irq (ide_hwif_t *hwif)
 991 {
 992         unsigned int index;
 993         ide_hwgroup_t *hwgroup;
 994         ide_hwif_t *match = NULL;
 995
 996
 997         BUG_ON(in_interrupt());
 998         BUG_ON(irqs_disabled());
 999         BUG_ON(hwif == NULL);
1000
1001         mutex_lock(&ide_cfg_mtx);
1002         hwif->hwgroup = NULL;
1003 #if MAX_HWIFS > 1
1004         /*
1005          * Group up with any other hwifs that share our irq(s).
1006          */
1007         for (index = 0; index < MAX_HWIFS; index++) {
1008                 ide_hwif_t *h = &ide_hwifs[index];
1009                 if (h->hwgroup) {  /* scan only initialized hwif's */
1010                         if (hwif->irq == h->irq) {
1011                                 hwif->sharing_irq = h->sharing_irq = 1;
1012                                 if (hwif->chipset != ide_pci ||
1013                                     h->chipset != ide_pci) {
1014                                         save_match(hwif, h, &match);
1015                                 }
1016                         }
1017                         if (hwif->serialized) {
1018                                 if (hwif->mate && hwif->mate->irq == h->irq)
1019                                         save_match(hwif, h, &match);
1020                         }
1021                         if (h->serialized) {
1022                                 if (h->mate && hwif->irq == h->mate->irq)
1023                                         save_match(hwif, h, &match);
1024                         }
1025                 }
1026         }
1027 #endif /* MAX_HWIFS > 1 */
1028         /*
1029          * If we are still without a hwgroup, then form a new one
1030          */
1031         if (match) {
1032                 hwgroup = match->hwgroup;
1033                 hwif->hwgroup = hwgroup;
1034                 /*
1035                  * Link us into the hwgroup.
1036                  * This must be done early, do ensure that unexpected_intr
1037                  * can find the hwif and prevent irq storms.
1038                  * No drives are attached to the new hwif, choose_drive
1039                  * can't do anything stupid (yet).
1040                  * Add ourself as the 2nd entry to the hwgroup->hwif
1041                  * linked list, the first entry is the hwif that owns
1042                  * hwgroup->handler - do not change that.
1043                  */
1044                 spin_lock_irq(&ide_lock);
1045                 hwif->next = hwgroup->hwif->next;
1046                 hwgroup->hwif->next = hwif;
1047                 spin_unlock_irq(&ide_lock);
1048         } else {
1049                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1050                                         GFP_KERNEL | __GFP_ZERO,
1051                                         hwif_to_node(hwif->drives[0].hwif));
1052                 if (!hwgroup)
1053                         goto out_up;
1054
1055                 hwif->hwgroup = hwgroup;
1056
1057                 hwgroup->hwif     = hwif->next = hwif;
1058                 hwgroup->rq       = NULL;
1059                 hwgroup->handler  = NULL;
1060                 hwgroup->drive    = NULL;
1061                 hwgroup->busy     = 0;
1062                 init_timer(&hwgroup->timer);
1063                 hwgroup->timer.function = &ide_timer_expiry;
1064                 hwgroup->timer.data = (unsigned long) hwgroup;
1065         }
1066
1067         /*
1068          * Allocate the irq, if not already obtained for another hwif
1069          */
1070         if (!match || match->irq != hwif->irq) {
1071                 int sa = IRQF_DISABLED;
1072 #if defined(__mc68000__) || defined(CONFIG_APUS)
1073                 sa = IRQF_SHARED;
1074 #endif /* __mc68000__ || CONFIG_APUS */
1075
1076                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1077                         sa = IRQF_SHARED;
1078 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1079                         sa |= IRQF_DISABLED;
1080 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1081                 }
1082
1083                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1084                         /* clear nIEN */
1085                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1086
1087                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1088                         goto out_unlink;
1089         }
1090
1091         /*
1092          * For any present drive:
1093          * - allocate the block device queue
1094          * - link drive into the hwgroup
1095          */
1096         for (index = 0; index < MAX_DRIVES; ++index) {
1097                 ide_drive_t *drive = &hwif->drives[index];
1098                 if (!drive->present)
1099                         continue;
1100                 if (ide_init_queue(drive)) {
1101                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1102                         continue;
1103                 }
1104                 spin_lock_irq(&ide_lock);
1105                 if (!hwgroup->drive) {
1106                         /* first drive for hwgroup. */
1107                         drive->next = drive;
1108                         hwgroup->drive = drive;
1109                         hwgroup->hwif = HWIF(hwgroup->drive);
1110                 } else {
1111                         drive->next = hwgroup->drive->next;
1112                         hwgroup->drive->next = drive;
1113                 }
1114                 spin_unlock_irq(&ide_lock);
1115         }
1116
1117 #if !defined(__mc68000__) && !defined(CONFIG_APUS)
1118         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1119                 hwif->io_ports[IDE_DATA_OFFSET],
1120                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1121                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1122 #else
1123         printk("%s at 0x%08lx on irq %d", hwif->name,
1124                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1125 #endif /* __mc68000__ && CONFIG_APUS */
1126         if (match)
1127                 printk(" (%sed with %s)",
1128                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1129         printk("\n");
1130         mutex_unlock(&ide_cfg_mtx);
1131         return 0;
1132 out_unlink:
1133         spin_lock_irq(&ide_lock);
1134         if (hwif->next == hwif) {
1135                 BUG_ON(match);
1136                 BUG_ON(hwgroup->hwif != hwif);
1137                 kfree(hwgroup);
1138         } else {
1139                 ide_hwif_t *g;
1140                 g = hwgroup->hwif;
1141                 while (g->next != hwif)
1142                         g = g->next;
1143                 g->next = hwif->next;
1144                 if (hwgroup->hwif == hwif) {
1145                         /* Impossible. */
1146                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1147                         hwgroup->hwif = g;
1148                 }
1149                 BUG_ON(hwgroup->hwif == hwif);
1150         }
1151         spin_unlock_irq(&ide_lock);
1152 out_up:
1153         mutex_unlock(&ide_cfg_mtx);
1154         return 1;
1155 }
1156
1157 static int ata_lock(dev_t dev, void *data)
1158 {
1159         /* FIXME: we want to pin hwif down */
1160         return 0;
1161 }
1162
1163 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1164 {
1165         ide_hwif_t *hwif = data;
1166         int unit = *part >> PARTN_BITS;
1167         ide_drive_t *drive = &hwif->drives[unit];
1168         if (!drive->present)
1169                 return NULL;
1170
1171         if (drive->media == ide_disk)
1172                 request_module("ide-disk");
1173         if (drive->scsi)
1174                 request_module("ide-scsi");
1175         if (drive->media == ide_cdrom || drive->media == ide_optical)
1176                 request_module("ide-cd");
1177         if (drive->media == ide_tape)
1178                 request_module("ide-tape");
1179         if (drive->media == ide_floppy)
1180                 request_module("ide-floppy");
1181
1182         return NULL;
1183 }
1184
1185 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1186 {
1187         struct gendisk *p = data;
1188         *part &= (1 << PARTN_BITS) - 1;
1189         return &p->kobj;
1190 }
1191
1192 static int exact_lock(dev_t dev, void *data)
1193 {
1194         struct gendisk *p = data;
1195
1196         if (!get_disk(p))
1197                 return -1;
1198         return 0;
1199 }
1200
1201 void ide_register_region(struct gendisk *disk)
1202 {
1203         blk_register_region(MKDEV(disk->major, disk->first_minor),
1204                             disk->minors, NULL, exact_match, exact_lock, disk);
1205 }
1206
1207 EXPORT_SYMBOL_GPL(ide_register_region);
1208
1209 void ide_unregister_region(struct gendisk *disk)
1210 {
1211         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1212                               disk->minors);
1213 }
1214
1215 EXPORT_SYMBOL_GPL(ide_unregister_region);
1216
1217 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1218 {
1219         ide_hwif_t *hwif = drive->hwif;
1220         unsigned int unit = (drive->select.all >> 4) & 1;
1221
1222         disk->major = hwif->major;
1223         disk->first_minor = unit << PARTN_BITS;
1224         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1225         disk->queue = drive->queue;
1226 }
1227
1228 EXPORT_SYMBOL_GPL(ide_init_disk);
1229
1230 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1231 {
1232         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1233
1234         if (drive == drive->next) {
1235                 /* special case: last drive from hwgroup. */
1236                 BUG_ON(hwgroup->drive != drive);
1237                 hwgroup->drive = NULL;
1238         } else {
1239                 ide_drive_t *walk;
1240
1241                 walk = hwgroup->drive;
1242                 while (walk->next != drive)
1243                         walk = walk->next;
1244                 walk->next = drive->next;
1245                 if (hwgroup->drive == drive) {
1246                         hwgroup->drive = drive->next;
1247                         hwgroup->hwif = hwgroup->drive->hwif;
1248                 }
1249         }
1250         BUG_ON(hwgroup->drive == drive);
1251 }
1252
1253 static void drive_release_dev (struct device *dev)
1254 {
1255         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1256
1257         spin_lock_irq(&ide_lock);
1258         ide_remove_drive_from_hwgroup(drive);
1259         kfree(drive->id);
1260         drive->id = NULL;
1261         drive->present = 0;
1262         /* Messed up locking ... */
1263         spin_unlock_irq(&ide_lock);
1264         blk_cleanup_queue(drive->queue);
1265         spin_lock_irq(&ide_lock);
1266         drive->queue = NULL;
1267         spin_unlock_irq(&ide_lock);
1268
1269         complete(&drive->gendev_rel_comp);
1270 }
1271
1272 /*
1273  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1274  * after probing for drives, to allocate partition tables and other data
1275  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1276  * somewhat later, during the partition check.
1277  */
1278 static void init_gendisk (ide_hwif_t *hwif)
1279 {
1280         unsigned int unit;
1281
1282         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1283                 ide_drive_t * drive = &hwif->drives[unit];
1284                 ide_add_generic_settings(drive);
1285                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1286                          hwif->index,unit);
1287                 drive->gendev.parent = &hwif->gendev;
1288                 drive->gendev.bus = &ide_bus_type;
1289                 drive->gendev.driver_data = drive;
1290                 drive->gendev.release = drive_release_dev;
1291         }
1292         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1293                         THIS_MODULE, ata_probe, ata_lock, hwif);
1294 }
1295
1296 static int hwif_init(ide_hwif_t *hwif)
1297 {
1298         int old_irq;
1299
1300         /* Return success if no device is connected */
1301         if (!hwif->present)
1302                 return 1;
1303
1304         if (!hwif->irq) {
1305                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1306                 {
1307                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1308                         return (hwif->present = 0);
1309                 }
1310         }
1311 #ifdef CONFIG_BLK_DEV_HD
1312         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1313                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1314                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1315                 return (hwif->present = 0);
1316         }
1317 #endif /* CONFIG_BLK_DEV_HD */
1318
1319         /* we set it back to 1 if all is ok below */
1320         hwif->present = 0;
1321
1322         if (register_blkdev(hwif->major, hwif->name))
1323                 return 0;
1324
1325         if (!hwif->sg_max_nents)
1326                 hwif->sg_max_nents = PRD_ENTRIES;
1327
1328         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1329                                  GFP_KERNEL);
1330         if (!hwif->sg_table) {
1331                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1332                 goto out;
1333         }
1334
1335         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1336
1337         if (init_irq(hwif) == 0)
1338                 goto done;
1339
1340         old_irq = hwif->irq;
1341         /*
1342          *      It failed to initialise. Find the default IRQ for
1343          *      this port and try that.
1344          */
1345         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1346                 printk("%s: Disabled unable to get IRQ %d.\n",
1347                         hwif->name, old_irq);
1348                 goto out;
1349         }
1350         if (init_irq(hwif)) {
1351                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1352                         hwif->name, old_irq, hwif->irq);
1353                 goto out;
1354         }
1355         printk("%s: probed IRQ %d failed, using default.\n",
1356                 hwif->name, hwif->irq);
1357
1358 done:
1359         init_gendisk(hwif);
1360
1361         ide_acpi_init(hwif);
1362
1363         hwif->present = 1;      /* success */
1364         return 1;
1365
1366 out:
1367         unregister_blkdev(hwif->major, hwif->name);
1368         return 0;
1369 }
1370
1371 static void hwif_register_devices(ide_hwif_t *hwif)
1372 {
1373         unsigned int i;
1374
1375         for (i = 0; i < MAX_DRIVES; i++) {
1376                 ide_drive_t *drive = &hwif->drives[i];
1377
1378                 if (drive->present) {
1379                         int ret = device_register(&drive->gendev);
1380
1381                         if (ret < 0)
1382                                 printk(KERN_WARNING "IDE: %s: "
1383                                         "device_register error: %d\n",
1384                                         __FUNCTION__, ret);
1385                 }
1386         }
1387 }
1388
1389 int ideprobe_init (void)
1390 {
1391         unsigned int index;
1392         int probe[MAX_HWIFS];
1393
1394         memset(probe, 0, MAX_HWIFS * sizeof(int));
1395         for (index = 0; index < MAX_HWIFS; ++index)
1396                 probe[index] = !ide_hwifs[index].present;
1397
1398         for (index = 0; index < MAX_HWIFS; ++index)
1399                 if (probe[index])
1400                         probe_hwif(&ide_hwifs[index]);
1401         for (index = 0; index < MAX_HWIFS; ++index)
1402                 if (probe[index])
1403                         hwif_init(&ide_hwifs[index]);
1404         for (index = 0; index < MAX_HWIFS; ++index) {
1405                 if (probe[index]) {
1406                         ide_hwif_t *hwif = &ide_hwifs[index];
1407                         if (!hwif->present)
1408                                 continue;
1409                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1410                                 hwif->chipset = ide_generic;
1411                         hwif_register_devices(hwif);
1412                 }
1413         }
1414         for (index = 0; index < MAX_HWIFS; ++index)
1415                 if (probe[index])
1416                         ide_proc_register_port(&ide_hwifs[index]);
1417         return 0;
1418 }
1419
1420 EXPORT_SYMBOL_GPL(ideprobe_init);
1421
1422 int ide_device_add(u8 idx[4])
1423 {
1424         int i, rc = 0;
1425
1426         for (i = 0; i < 4; i++) {
1427                 if (idx[i] != 0xff)
1428                         rc |= probe_hwif_init(&ide_hwifs[idx[i]]);
1429         }
1430
1431         for (i = 0; i < 4; i++) {
1432                 if (idx[i] != 0xff)
1433                         ide_proc_register_port(&ide_hwifs[idx[i]]);
1434         }
1435
1436         return rc;
1437 }
1438
1439 EXPORT_SYMBOL_GPL(ide_device_add);