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   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 #undef REALLY_SLOW_IO           /* most systems can safely undef this */
  35
  36 #include <linux/config.h>
  37 #include <linux/module.h>
  38 #include <linux/types.h>
  39 #include <linux/string.h>
  40 #include <linux/kernel.h>
  41 #include <linux/timer.h>
  42 #include <linux/mm.h>
  43 #include <linux/interrupt.h>
  44 #include <linux/major.h>
  45 #include <linux/errno.h>
  46 #include <linux/genhd.h>
  47 #include <linux/slab.h>
  48 #include <linux/delay.h>
  49 #include <linux/ide.h>
  50 #include <linux/devfs_fs_kernel.h>
  51 #include <linux/spinlock.h>
  52 #include <linux/kmod.h>
  53 #include <linux/pci.h>
  54
  55 #include <asm/byteorder.h>
  56 #include <asm/irq.h>
  57 #include <asm/uaccess.h>
  58 #include <asm/io.h>
  59
  60 /**
  61  *      generic_id              -       add a generic drive id
  62  *      @drive: drive to make an ID block for
  63  *
  64  *      Add a fake id field to the drive we are passed. This allows
  65  *      use to skip a ton of NULL checks (which people always miss)
  66  *      and make drive properties unconditional outside of this file
  67  */
  68
  69 static void generic_id(ide_drive_t *drive)
  70 {
  71         drive->id->cyls = drive->cyl;
  72         drive->id->heads = drive->head;
  73         drive->id->sectors = drive->sect;
  74         drive->id->cur_cyls = drive->cyl;
  75         drive->id->cur_heads = drive->head;
  76         drive->id->cur_sectors = drive->sect;
  77 }
  78
  79 static void ide_disk_init_chs(ide_drive_t *drive)
  80 {
  81         struct hd_driveid *id = drive->id;
  82
  83         /* Extract geometry if we did not already have one for the drive */
  84         if (!drive->cyl || !drive->head || !drive->sect) {
  85                 drive->cyl  = drive->bios_cyl  = id->cyls;
  86                 drive->head = drive->bios_head = id->heads;
  87                 drive->sect = drive->bios_sect = id->sectors;
  88         }
  89
  90         /* Handle logical geometry translation by the drive */
  91         if ((id->field_valid & 1) && id->cur_cyls &&
  92             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
  93                 drive->cyl  = id->cur_cyls;
  94                 drive->head = id->cur_heads;
  95                 drive->sect = id->cur_sectors;
  96         }
  97
  98         /* Use physical geometry if what we have still makes no sense */
  99         if (drive->head > 16 && id->heads && id->heads <= 16) {
 100                 drive->cyl  = id->cyls;
 101                 drive->head = id->heads;
 102                 drive->sect = id->sectors;
 103         }
 104 }
 105
 106 static void ide_disk_init_mult_count(ide_drive_t *drive)
 107 {
 108         struct hd_driveid *id = drive->id;
 109
 110         drive->mult_count = 0;
 111         if (id->max_multsect) {
 112 #ifdef CONFIG_IDEDISK_MULTI_MODE
 113                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
 114                 id->multsect_valid = id->multsect ? 1 : 0;
 115                 drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
 116                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
 117 #else   /* original, pre IDE-NFG, per request of AC */
 118                 drive->mult_req = INITIAL_MULT_COUNT;
 119                 if (drive->mult_req > id->max_multsect)
 120                         drive->mult_req = id->max_multsect;
 121                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
 122                         drive->special.b.set_multmode = 1;
 123 #endif
 124         }
 125 }
 126
 127 /**
 128  *      do_identify     -       identify a drive
 129  *      @drive: drive to identify
 130  *      @cmd: command used
 131  *
 132  *      Called when we have issued a drive identify command to
 133  *      read and parse the results. This function is run with
 134  *      interrupts disabled.
 135  */
 136
 137 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 138 {
 139         ide_hwif_t *hwif = HWIF(drive);
 140         int bswap = 1;
 141         struct hd_driveid *id;
 142
 143         id = drive->id;
 144         /* read 512 bytes of id info */
 145         hwif->ata_input_data(drive, id, SECTOR_WORDS);
 146
 147         drive->id_read = 1;
 148         local_irq_enable();
 149         ide_fix_driveid(id);
 150
 151 #if defined (CONFIG_SCSI_EATA_DMA) || defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 152         /*
 153          * EATA SCSI controllers do a hardware ATA emulation:
 154          * Ignore them if there is a driver for them available.
 155          */
 156         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 157             (id->model[0] == 'S' && id->model[1] == 'K')) {
 158                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 159                 goto err_misc;
 160         }
 161 #endif /* CONFIG_SCSI_EATA_DMA || CONFIG_SCSI_EATA_PIO */
 162
 163         /*
 164          *  WIN_IDENTIFY returns little-endian info,
 165          *  WIN_PIDENTIFY *usually* returns little-endian info.
 166          */
 167         if (cmd == WIN_PIDENTIFY) {
 168                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 169                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 170                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 171                         /* Vertos drives may still be weird */
 172                         bswap ^= 1;
 173         }
 174         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 175         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 176         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 177
 178         if (strstr(id->model, "E X A B Y T E N E S T"))
 179                 goto err_misc;
 180
 181         /* we depend on this a lot! */
 182         id->model[sizeof(id->model)-1] = '\0';
 183         printk("%s: %s, ", drive->name, id->model);
 184         drive->present = 1;
 185         drive->dead = 0;
 186
 187         /*
 188          * Check for an ATAPI device
 189          */
 190         if (cmd == WIN_PIDENTIFY) {
 191                 u8 type = (id->config >> 8) & 0x1f;
 192                 printk("ATAPI ");
 193                 switch (type) {
 194                         case ide_floppy:
 195                                 if (!strstr(id->model, "CD-ROM")) {
 196                                         if (!strstr(id->model, "oppy") &&
 197                                             !strstr(id->model, "poyp") &&
 198                                             !strstr(id->model, "ZIP"))
 199                                                 printk("cdrom or floppy?, assuming ");
 200                                         if (drive->media != ide_cdrom) {
 201                                                 printk ("FLOPPY");
 202                                                 drive->removable = 1;
 203                                                 break;
 204                                         }
 205                                 }
 206                                 /* Early cdrom models used zero */
 207                                 type = ide_cdrom;
 208                         case ide_cdrom:
 209                                 drive->removable = 1;
 210 #ifdef CONFIG_PPC
 211                                 /* kludge for Apple PowerBook internal zip */
 212                                 if (!strstr(id->model, "CD-ROM") &&
 213                                     strstr(id->model, "ZIP")) {
 214                                         printk ("FLOPPY");
 215                                         type = ide_floppy;
 216                                         break;
 217                                 }
 218 #endif
 219                                 printk ("CD/DVD-ROM");
 220                                 break;
 221                         case ide_tape:
 222                                 printk ("TAPE");
 223                                 break;
 224                         case ide_optical:
 225                                 printk ("OPTICAL");
 226                                 drive->removable = 1;
 227                                 break;
 228                         default:
 229                                 printk("UNKNOWN (type %d)", type);
 230                                 break;
 231                 }
 232                 printk (" drive\n");
 233                 drive->media = type;
 234                 /* an ATAPI device ignores DRDY */
 235                 drive->ready_stat = 0;
 236                 return;
 237         }
 238
 239         /*
 240          * Not an ATAPI device: looks like a "regular" hard disk
 241          */
 242
 243         /*
 244          * 0x848a = CompactFlash device
 245          * These are *not* removable in Linux definition of the term
 246          */
 247
 248         if ((id->config != 0x848a) && (id->config & (1<<7)))
 249                 drive->removable = 1;
 250
 251         drive->media = ide_disk;
 252         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
 253         QUIRK_LIST(drive);
 254         return;
 255
 256 err_misc:
 257         kfree(id);
 258         drive->present = 0;
 259         return;
 260 }
 261
 262 /**
 263  *      actual_try_to_identify  -       send ata/atapi identify
 264  *      @drive: drive to identify
 265  *      @cmd: command to use
 266  *
 267  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 268  *      and waits for a response.  It also monitors irqs while this is
 269  *      happening, in hope of automatically determining which one is
 270  *      being used by the interface.
 271  *
 272  *      Returns:        0  device was identified
 273  *                      1  device timed-out (no response to identify request)
 274  *                      2  device aborted the command (refused to identify itself)
 275  */
 276
 277 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 278 {
 279         ide_hwif_t *hwif = HWIF(drive);
 280         int rc;
 281         unsigned long hd_status;
 282         unsigned long timeout;
 283         u8 s = 0, a = 0;
 284
 285         /* take a deep breath */
 286         msleep(50);
 287
 288         if (IDE_CONTROL_REG) {
 289                 a = hwif->INB(IDE_ALTSTATUS_REG);
 290                 s = hwif->INB(IDE_STATUS_REG);
 291                 if ((a ^ s) & ~INDEX_STAT) {
 292                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 293                                 "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 294                         /* ancient Seagate drives, broken interfaces */
 295                         hd_status = IDE_STATUS_REG;
 296                 } else {
 297                         /* use non-intrusive polling */
 298                         hd_status = IDE_ALTSTATUS_REG;
 299                 }
 300         } else
 301                 hd_status = IDE_STATUS_REG;
 302
 303         /* set features register for atapi
 304          * identify command to be sure of reply
 305          */
 306         if ((cmd == WIN_PIDENTIFY))
 307                 /* disable dma & overlap */
 308                 hwif->OUTB(0, IDE_FEATURE_REG);
 309
 310         /* ask drive for ID */
 311         hwif->OUTB(cmd, IDE_COMMAND_REG);
 312
 313         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 314         timeout += jiffies;
 315         do {
 316                 if (time_after(jiffies, timeout)) {
 317                         /* drive timed-out */
 318                         return 1;
 319                 }
 320                 /* give drive a breather */
 321                 msleep(50);
 322         } while ((hwif->INB(hd_status)) & BUSY_STAT);
 323
 324         /* wait for IRQ and DRQ_STAT */
 325         msleep(50);
 326         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 327                 unsigned long flags;
 328
 329                 /* local CPU only; some systems need this */
 330                 local_irq_save(flags);
 331                 /* drive returned ID */
 332                 do_identify(drive, cmd);
 333                 /* drive responded with ID */
 334                 rc = 0;
 335                 /* clear drive IRQ */
 336                 (void) hwif->INB(IDE_STATUS_REG);
 337                 local_irq_restore(flags);
 338         } else {
 339                 /* drive refused ID */
 340                 rc = 2;
 341         }
 342         return rc;
 343 }
 344
 345 /**
 346  *      try_to_identify -       try to identify a drive
 347  *      @drive: drive to probe
 348  *      @cmd: command to use
 349  *
 350  *      Issue the identify command and then do IRQ probing to
 351  *      complete the identification when needed by finding the
 352  *      IRQ the drive is attached to
 353  */
 354
 355 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 356 {
 357         ide_hwif_t *hwif = HWIF(drive);
 358         int retval;
 359         int autoprobe = 0;
 360         unsigned long cookie = 0;
 361
 362         /*
 363          * Disable device irq unless we need to
 364          * probe for it. Otherwise we'll get spurious
 365          * interrupts during the identify-phase that
 366          * the irq handler isn't expecting.
 367          */
 368         if (IDE_CONTROL_REG) {
 369                 u8 ctl = drive->ctl | 2;
 370                 if (!hwif->irq) {
 371                         autoprobe = 1;
 372                         cookie = probe_irq_on();
 373                         /* enable device irq */
 374                         ctl &= ~2;
 375                 }
 376                 hwif->OUTB(ctl, IDE_CONTROL_REG);
 377         }
 378
 379         retval = actual_try_to_identify(drive, cmd);
 380
 381         if (autoprobe) {
 382                 int irq;
 383                 /* mask device irq */
 384                 hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 385                 /* clear drive IRQ */
 386                 (void) hwif->INB(IDE_STATUS_REG);
 387                 udelay(5);
 388                 irq = probe_irq_off(cookie);
 389                 if (!hwif->irq) {
 390                         if (irq > 0) {
 391                                 hwif->irq = irq;
 392                         } else {
 393                                 /* Mmmm.. multiple IRQs..
 394                                  * don't know which was ours
 395                                  */
 396                                 printk("%s: IRQ probe failed (0x%lx)\n",
 397                                         drive->name, cookie);
 398                         }
 399                 }
 400         }
 401         return retval;
 402 }
 403
 404
 405 /**
 406  *      do_probe                -       probe an IDE device
 407  *      @drive: drive to probe
 408  *      @cmd: command to use
 409  *
 410  *      do_probe() has the difficult job of finding a drive if it exists,
 411  *      without getting hung up if it doesn't exist, without trampling on
 412  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 413  *
 414  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 415  *      but does not respond right away, the probe will "hang in there"
 416  *      for the maximum wait time (about 30 seconds), otherwise it will
 417  *      exit much more quickly.
 418  *
 419  * Returns:     0  device was identified
 420  *              1  device timed-out (no response to identify request)
 421  *              2  device aborted the command (refused to identify itself)
 422  *              3  bad status from device (possible for ATAPI drives)
 423  *              4  probe was not attempted because failure was obvious
 424  */
 425
 426 static int do_probe (ide_drive_t *drive, u8 cmd)
 427 {
 428         int rc;
 429         ide_hwif_t *hwif = HWIF(drive);
 430
 431         if (drive->present) {
 432                 /* avoid waiting for inappropriate probes */
 433                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 434                         return 4;
 435         }
 436 #ifdef DEBUG
 437         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 438                 drive->name, drive->present, drive->media,
 439                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 440 #endif
 441
 442         /* needed for some systems
 443          * (e.g. crw9624 as drive0 with disk as slave)
 444          */
 445         msleep(50);
 446         SELECT_DRIVE(drive);
 447         msleep(50);
 448         if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 449                 if (drive->select.b.unit != 0) {
 450                         /* exit with drive0 selected */
 451                         SELECT_DRIVE(&hwif->drives[0]);
 452                         /* allow BUSY_STAT to assert & clear */
 453                         msleep(50);
 454                 }
 455                 /* no i/f present: mmm.. this should be a 4 -ml */
 456                 return 3;
 457         }
 458
 459         if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 460             drive->present || cmd == WIN_PIDENTIFY) {
 461                 /* send cmd and wait */
 462                 if ((rc = try_to_identify(drive, cmd))) {
 463                         /* failed: try again */
 464                         rc = try_to_identify(drive,cmd);
 465                 }
 466                 if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 467                         return 4;
 468
 469                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 470                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 471                         (drive->autotune == IDE_TUNE_AUTO))) {
 472                         unsigned long timeout;
 473                         printk("%s: no response (status = 0x%02x), "
 474                                 "resetting drive\n", drive->name,
 475                                 hwif->INB(IDE_STATUS_REG));
 476                         msleep(50);
 477                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 478                         msleep(50);
 479                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 480                         timeout = jiffies;
 481                         while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
 482                                time_before(jiffies, timeout + WAIT_WORSTCASE))
 483                                 msleep(50);
 484                         rc = try_to_identify(drive, cmd);
 485                 }
 486                 if (rc == 1)
 487                         printk("%s: no response (status = 0x%02x)\n",
 488                                 drive->name, hwif->INB(IDE_STATUS_REG));
 489                 /* ensure drive irq is clear */
 490                 (void) hwif->INB(IDE_STATUS_REG);
 491         } else {
 492                 /* not present or maybe ATAPI */
 493                 rc = 3;
 494         }
 495         if (drive->select.b.unit != 0) {
 496                 /* exit with drive0 selected */
 497                 SELECT_DRIVE(&hwif->drives[0]);
 498                 msleep(50);
 499                 /* ensure drive irq is clear */
 500                 (void) hwif->INB(IDE_STATUS_REG);
 501         }
 502         return rc;
 503 }
 504
 505 /*
 506  *
 507  */
 508 static void enable_nest (ide_drive_t *drive)
 509 {
 510         ide_hwif_t *hwif = HWIF(drive);
 511         unsigned long timeout;
 512
 513         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 514         SELECT_DRIVE(drive);
 515         msleep(50);
 516         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 517         timeout = jiffies + WAIT_WORSTCASE;
 518         do {
 519                 if (time_after(jiffies, timeout)) {
 520                         printk("failed (timeout)\n");
 521                         return;
 522                 }
 523                 msleep(50);
 524         } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 525
 526         msleep(50);
 527
 528         if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 529                 printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 530         } else {
 531                 printk("success\n");
 532         }
 533
 534         /* if !(success||timed-out) */
 535         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 536                 /* look for ATAPI device */
 537                 (void) do_probe(drive, WIN_PIDENTIFY);
 538         }
 539 }
 540
 541 /**
 542  *      probe_for_drives        -       upper level drive probe
 543  *      @drive: drive to probe for
 544  *
 545  *      probe_for_drive() tests for existence of a given drive using do_probe()
 546  *      and presents things to the user as needed.
 547  *
 548  *      Returns:        0  no device was found
 549  *                      1  device was found (note: drive->present might
 550  *                         still be 0)
 551  */
 552
 553 static inline u8 probe_for_drive (ide_drive_t *drive)
 554 {
 555         /*
 556          *      In order to keep things simple we have an id
 557          *      block for all drives at all times. If the device
 558          *      is pre ATA or refuses ATA/ATAPI identify we
 559          *      will add faked data to this.
 560          *
 561          *      Also note that 0 everywhere means "can't do X"
 562          */
 563
 564         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 565         drive->id_read = 0;
 566         if(drive->id == NULL)
 567         {
 568                 printk(KERN_ERR "ide: out of memory for id data.\n");
 569                 return 0;
 570         }
 571         strcpy(drive->id->model, "UNKNOWN");
 572
 573         /* skip probing? */
 574         if (!drive->noprobe)
 575         {
 576                 /* if !(success||timed-out) */
 577                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 578                         /* look for ATAPI device */
 579                         (void) do_probe(drive, WIN_PIDENTIFY);
 580                 }
 581                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 582                         enable_nest(drive);
 583                 if (!drive->present)
 584                         /* drive not found */
 585                         return 0;
 586
 587                 /* identification failed? */
 588                 if (!drive->id_read) {
 589                         if (drive->media == ide_disk) {
 590                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 591                                         drive->name, drive->cyl,
 592                                         drive->head, drive->sect);
 593                         } else if (drive->media == ide_cdrom) {
 594                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 595                         } else {
 596                                 /* nuke it */
 597                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 598                                 drive->present = 0;
 599                         }
 600                 }
 601                 /* drive was found */
 602         }
 603         if(!drive->present)
 604                 return 0;
 605         /* The drive wasn't being helpful. Add generic info only */
 606         if (drive->id_read == 0) {
 607                 generic_id(drive);
 608                 return 1;
 609         }
 610
 611         if (drive->media == ide_disk) {
 612                 ide_disk_init_chs(drive);
 613                 ide_disk_init_mult_count(drive);
 614         }
 615
 616         return drive->present;
 617 }
 618
 619 static void hwif_release_dev (struct device *dev)
 620 {
 621         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 622
 623         complete(&hwif->gendev_rel_comp);
 624 }
 625
 626 static void hwif_register (ide_hwif_t *hwif)
 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         device_register(&hwif->gendev);
 640 }
 641
 642 static int wait_hwif_ready(ide_hwif_t *hwif)
 643 {
 644         int rc;
 645
 646         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 647
 648         /* Let HW settle down a bit from whatever init state we
 649          * come from */
 650         mdelay(2);
 651
 652         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 653          * I know of at least one disk who takes 31 seconds, I use 35
 654          * here to be safe
 655          */
 656         rc = ide_wait_not_busy(hwif, 35000);
 657         if (rc)
 658                 return rc;
 659
 660         /* Now make sure both master & slave are ready */
 661         SELECT_DRIVE(&hwif->drives[0]);
 662         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 663         mdelay(2);
 664         rc = ide_wait_not_busy(hwif, 35000);
 665         if (rc)
 666                 return rc;
 667         SELECT_DRIVE(&hwif->drives[1]);
 668         hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 669         mdelay(2);
 670         rc = ide_wait_not_busy(hwif, 35000);
 671
 672         /* Exit function with master reselected (let's be sane) */
 673         SELECT_DRIVE(&hwif->drives[0]);
 674
 675         return rc;
 676 }
 677
 678 /**
 679  *      ide_undecoded_slave     -       look for bad CF adapters
 680  *      @hwif: interface
 681  *
 682  *      Analyse the drives on the interface and attempt to decide if we
 683  *      have the same drive viewed twice. This occurs with crap CF adapters
 684  *      and PCMCIA sometimes.
 685  */
 686
 687 void ide_undecoded_slave(ide_hwif_t *hwif)
 688 {
 689         ide_drive_t *drive0 = &hwif->drives[0];
 690         ide_drive_t *drive1 = &hwif->drives[1];
 691
 692         if (drive0->present == 0 || drive1->present == 0)
 693                 return;
 694
 695         /* If the models don't match they are not the same product */
 696         if (strcmp(drive0->id->model, drive1->id->model))
 697                 return;
 698
 699         /* Serial numbers do not match */
 700         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 701                 return;
 702
 703         /* No serial number, thankfully very rare for CF */
 704         if (drive0->id->serial_no[0] == 0)
 705                 return;
 706
 707         /* Appears to be an IDE flash adapter with decode bugs */
 708         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 709
 710         drive1->present = 0;
 711 }
 712
 713 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 714
 715 /*
 716  * This routine only knows how to look for drive units 0 and 1
 717  * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 718  */
 719 static void probe_hwif(ide_hwif_t *hwif)
 720 {
 721         unsigned int unit;
 722         unsigned long flags;
 723         unsigned int irqd;
 724
 725         if (hwif->noprobe)
 726                 return;
 727
 728         if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 729             (ide_hwif_request_regions(hwif))) {
 730                 u16 msgout = 0;
 731                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 732                         ide_drive_t *drive = &hwif->drives[unit];
 733                         if (drive->present) {
 734                                 drive->present = 0;
 735                                 printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 736                                         drive->name);
 737                                 msgout = 1;
 738                         }
 739                 }
 740                 if (!msgout)
 741                         printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 742                                 hwif->name);
 743                 return;
 744         }
 745
 746         /*
 747          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 748          * we'll install our IRQ driver much later...
 749          */
 750         irqd = hwif->irq;
 751         if (irqd)
 752                 disable_irq(hwif->irq);
 753
 754         local_irq_set(flags);
 755
 756         /* This is needed on some PPCs and a bunch of BIOS-less embedded
 757          * platforms. Typical cases are:
 758          *
 759          *  - The firmware hard reset the disk before booting the kernel,
 760          *    the drive is still doing it's poweron-reset sequence, that
 761          *    can take up to 30 seconds
 762          *  - The firmware does nothing (or no firmware), the device is
 763          *    still in POST state (same as above actually).
 764          *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 765          *    their reset sequence even when they are non-selected slave
 766          *    devices, thus preventing discovery of the main HD
 767          *
 768          *  Doing this wait-for-busy should not harm any existing configuration
 769          *  (at least things won't be worse than what current code does, that
 770          *  is blindly go & talk to the drive) and fix some issues like the
 771          *  above.
 772          *
 773          *  BenH.
 774          */
 775         if (wait_hwif_ready(hwif) == -EBUSY)
 776                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 777
 778         /*
 779          * Second drive should only exist if first drive was found,
 780          * but a lot of cdrom drives are configured as single slaves.
 781          */
 782         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 783                 ide_drive_t *drive = &hwif->drives[unit];
 784                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 785                 (void) probe_for_drive(drive);
 786                 if (drive->present && !hwif->present) {
 787                         hwif->present = 1;
 788                         if (hwif->chipset != ide_4drives ||
 789                             !hwif->mate ||
 790                             !hwif->mate->present) {
 791                                 hwif_register(hwif);
 792                         }
 793                 }
 794         }
 795         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 796                 unsigned long timeout = jiffies + WAIT_WORSTCASE;
 797                 u8 stat;
 798
 799                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 800                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 801                 udelay(10);
 802                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 803                 do {
 804                         msleep(50);
 805                         stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 806                 } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 807
 808         }
 809         local_irq_restore(flags);
 810         /*
 811          * Use cached IRQ number. It might be (and is...) changed by probe
 812          * code above
 813          */
 814         if (irqd)
 815                 enable_irq(irqd);
 816
 817         if (!hwif->present) {
 818                 ide_hwif_release_regions(hwif);
 819                 return;
 820         }
 821
 822         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 823                 ide_drive_t *drive = &hwif->drives[unit];
 824
 825                 if (drive->present) {
 826                         if (hwif->tuneproc != NULL &&
 827                                 drive->autotune == IDE_TUNE_AUTO)
 828                                 /* auto-tune PIO mode */
 829                                 hwif->tuneproc(drive, 255);
 830
 831                         if (drive->autotune != IDE_TUNE_DEFAULT &&
 832                             drive->autotune != IDE_TUNE_AUTO)
 833                                 continue;
 834
 835                         drive->nice1 = 1;
 836
 837                         /*
 838                          * MAJOR HACK BARF :-/
 839                          *
 840                          * FIXME: chipsets own this cruft!
 841                          */
 842                         /*
 843                          * Move here to prevent module loading clashing.
 844                          */
 845         //              drive->autodma = hwif->autodma;
 846                         if (hwif->ide_dma_check) {
 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->ide_dma_off_quietly(drive);
 854 #ifdef CONFIG_IDEDMA_ONLYDISK
 855                                 if (drive->media == ide_disk)
 856 #endif
 857                                         hwif->ide_dma_check(drive);
 858                         }
 859                 }
 860         }
 861 }
 862
 863 static int hwif_init(ide_hwif_t *hwif);
 864
 865 int probe_hwif_init_with_fixup(ide_hwif_t *hwif, void (*fixup)(ide_hwif_t *hwif))
 866 {
 867         probe_hwif(hwif);
 868
 869         if (fixup)
 870                 fixup(hwif);
 871
 872         if (!hwif_init(hwif)) {
 873                 printk(KERN_INFO "%s: failed to initialize IDE interface\n",
 874                                  hwif->name);
 875                 return -1;
 876         }
 877
 878         if (hwif->present) {
 879                 u16 unit = 0;
 880                 for (unit = 0; unit < MAX_DRIVES; ++unit) {
 881                         ide_drive_t *drive = &hwif->drives[unit];
 882                         /* For now don't attach absent drives, we may
 883                            want them on default or a new "empty" class
 884                            for hotplug reprobing ? */
 885                         if (drive->present) {
 886                                 device_register(&drive->gendev);
 887                         }
 888                 }
 889         }
 890         return 0;
 891 }
 892
 893 int probe_hwif_init(ide_hwif_t *hwif)
 894 {
 895         return probe_hwif_init_with_fixup(hwif, NULL);
 896 }
 897
 898 EXPORT_SYMBOL(probe_hwif_init);
 899
 900 #if MAX_HWIFS > 1
 901 /*
 902  * save_match() is used to simplify logic in init_irq() below.
 903  *
 904  * A loophole here is that we may not know about a particular
 905  * hwif's irq until after that hwif is actually probed/initialized..
 906  * This could be a problem for the case where an hwif is on a
 907  * dual interface that requires serialization (eg. cmd640) and another
 908  * hwif using one of the same irqs is initialized beforehand.
 909  *
 910  * This routine detects and reports such situations, but does not fix them.
 911  */
 912 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 913 {
 914         ide_hwif_t *m = *match;
 915
 916         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 917                 if (!new->hwgroup)
 918                         return;
 919                 printk("%s: potential irq problem with %s and %s\n",
 920                         hwif->name, new->name, m->name);
 921         }
 922         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 923                 *match = new;
 924 }
 925 #endif /* MAX_HWIFS > 1 */
 926
 927 /*
 928  * init request queue
 929  */
 930 static int ide_init_queue(ide_drive_t *drive)
 931 {
 932         request_queue_t *q;
 933         ide_hwif_t *hwif = HWIF(drive);
 934         int max_sectors = 256;
 935         int max_sg_entries = PRD_ENTRIES;
 936
 937         /*
 938          *      Our default set up assumes the normal IDE case,
 939          *      that is 64K segmenting, standard PRD setup
 940          *      and LBA28. Some drivers then impose their own
 941          *      limits and LBA48 we could raise it but as yet
 942          *      do not.
 943          */
 944
 945         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 946         if (!q)
 947                 return 1;
 948
 949         q->queuedata = drive;
 950         blk_queue_segment_boundary(q, 0xffff);
 951
 952         if (!hwif->rqsize) {
 953                 if (hwif->no_lba48 || hwif->no_lba48_dma)
 954                         hwif->rqsize = 256;
 955                 else
 956                         hwif->rqsize = 65536;
 957         }
 958         if (hwif->rqsize < max_sectors)
 959                 max_sectors = hwif->rqsize;
 960         blk_queue_max_sectors(q, max_sectors);
 961
 962 #ifdef CONFIG_PCI
 963         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 964          * creates segments that don't completely match our boundary
 965          * requirements and thus need to be broken up again. Because it
 966          * doesn't align properly either, we may actually have to break up
 967          * to more segments than what was we got in the first place, a max
 968          * worst case is twice as many.
 969          * This will be fixed once we teach pci_map_sg() about our boundary
 970          * requirements, hopefully soon. *FIXME*
 971          */
 972         if (!PCI_DMA_BUS_IS_PHYS)
 973                 max_sg_entries >>= 1;
 974 #endif /* CONFIG_PCI */
 975
 976         blk_queue_max_hw_segments(q, max_sg_entries);
 977         blk_queue_max_phys_segments(q, max_sg_entries);
 978
 979         /* assign drive queue */
 980         drive->queue = q;
 981
 982         /* needs drive->queue to be set */
 983         ide_toggle_bounce(drive, 1);
 984
 985         /* enable led activity for disk drives only */
 986         if (drive->media == ide_disk && hwif->led_act)
 987                 blk_queue_activity_fn(q, hwif->led_act, drive);
 988
 989         return 0;
 990 }
 991
 992 /*
 993  * This routine sets up the irq for an ide interface, and creates a new
 994  * hwgroup for the irq/hwif if none was previously assigned.
 995  *
 996  * Much of the code is for correctly detecting/handling irq sharing
 997  * and irq serialization situations.  This is somewhat complex because
 998  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 999  *
1000  * The SA_INTERRUPT in sa_flags means ide_intr() is always entered with
1001  * interrupts completely disabled.  This can be bad for interrupt latency,
1002  * but anything else has led to problems on some machines.  We re-enable
1003  * interrupts as much as we can safely do in most places.
1004  */
1005 static int init_irq (ide_hwif_t *hwif)
1006 {
1007         unsigned int index;
1008         ide_hwgroup_t *hwgroup;
1009         ide_hwif_t *match = NULL;
1010
1011
1012         BUG_ON(in_interrupt());
1013         BUG_ON(irqs_disabled());
1014         BUG_ON(hwif == NULL);
1015
1016         down(&ide_cfg_sem);
1017         hwif->hwgroup = NULL;
1018 #if MAX_HWIFS > 1
1019         /*
1020          * Group up with any other hwifs that share our irq(s).
1021          */
1022         for (index = 0; index < MAX_HWIFS; index++) {
1023                 ide_hwif_t *h = &ide_hwifs[index];
1024                 if (h->hwgroup) {  /* scan only initialized hwif's */
1025                         if (hwif->irq == h->irq) {
1026                                 hwif->sharing_irq = h->sharing_irq = 1;
1027                                 if (hwif->chipset != ide_pci ||
1028                                     h->chipset != ide_pci) {
1029                                         save_match(hwif, h, &match);
1030                                 }
1031                         }
1032                         if (hwif->serialized) {
1033                                 if (hwif->mate && hwif->mate->irq == h->irq)
1034                                         save_match(hwif, h, &match);
1035                         }
1036                         if (h->serialized) {
1037                                 if (h->mate && hwif->irq == h->mate->irq)
1038                                         save_match(hwif, h, &match);
1039                         }
1040                 }
1041         }
1042 #endif /* MAX_HWIFS > 1 */
1043         /*
1044          * If we are still without a hwgroup, then form a new one
1045          */
1046         if (match) {
1047                 hwgroup = match->hwgroup;
1048                 hwif->hwgroup = hwgroup;
1049                 /*
1050                  * Link us into the hwgroup.
1051                  * This must be done early, do ensure that unexpected_intr
1052                  * can find the hwif and prevent irq storms.
1053                  * No drives are attached to the new hwif, choose_drive
1054                  * can't do anything stupid (yet).
1055                  * Add ourself as the 2nd entry to the hwgroup->hwif
1056                  * linked list, the first entry is the hwif that owns
1057                  * hwgroup->handler - do not change that.
1058                  */
1059                 spin_lock_irq(&ide_lock);
1060                 hwif->next = hwgroup->hwif->next;
1061                 hwgroup->hwif->next = hwif;
1062                 spin_unlock_irq(&ide_lock);
1063         } else {
1064                 hwgroup = kmalloc_node(sizeof(ide_hwgroup_t), GFP_KERNEL,
1065                                         hwif_to_node(hwif->drives[0].hwif));
1066                 if (!hwgroup)
1067                         goto out_up;
1068
1069                 hwif->hwgroup = hwgroup;
1070
1071                 memset(hwgroup, 0, sizeof(ide_hwgroup_t));
1072                 hwgroup->hwif     = hwif->next = hwif;
1073                 hwgroup->rq       = NULL;
1074                 hwgroup->handler  = NULL;
1075                 hwgroup->drive    = NULL;
1076                 hwgroup->busy     = 0;
1077                 init_timer(&hwgroup->timer);
1078                 hwgroup->timer.function = &ide_timer_expiry;
1079                 hwgroup->timer.data = (unsigned long) hwgroup;
1080         }
1081
1082         /*
1083          * Allocate the irq, if not already obtained for another hwif
1084          */
1085         if (!match || match->irq != hwif->irq) {
1086                 int sa = SA_INTERRUPT;
1087 #if defined(__mc68000__) || defined(CONFIG_APUS)
1088                 sa = SA_SHIRQ;
1089 #endif /* __mc68000__ || CONFIG_APUS */
1090
1091                 if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1092                         sa = SA_SHIRQ;
1093 #ifndef CONFIG_IDEPCI_SHARE_IRQ
1094                         sa |= SA_INTERRUPT;
1095 #endif /* CONFIG_IDEPCI_SHARE_IRQ */
1096                 }
1097
1098                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1099                         /* clear nIEN */
1100                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1101
1102                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1103                         goto out_unlink;
1104         }
1105
1106         /*
1107          * For any present drive:
1108          * - allocate the block device queue
1109          * - link drive into the hwgroup
1110          */
1111         for (index = 0; index < MAX_DRIVES; ++index) {
1112                 ide_drive_t *drive = &hwif->drives[index];
1113                 if (!drive->present)
1114                         continue;
1115                 if (ide_init_queue(drive)) {
1116                         printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1117                         continue;
1118                 }
1119                 spin_lock_irq(&ide_lock);
1120                 if (!hwgroup->drive) {
1121                         /* first drive for hwgroup. */
1122                         drive->next = drive;
1123                         hwgroup->drive = drive;
1124                         hwgroup->hwif = HWIF(hwgroup->drive);
1125                 } else {
1126                         drive->next = hwgroup->drive->next;
1127                         hwgroup->drive->next = drive;
1128                 }
1129                 spin_unlock_irq(&ide_lock);
1130         }
1131
1132 #if !defined(__mc68000__) && !defined(CONFIG_APUS) && !defined(__sparc__)
1133         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1134                 hwif->io_ports[IDE_DATA_OFFSET],
1135                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1136                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1137 #elif defined(__sparc__)
1138         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %s", hwif->name,
1139                 hwif->io_ports[IDE_DATA_OFFSET],
1140                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1141                 hwif->io_ports[IDE_CONTROL_OFFSET], __irq_itoa(hwif->irq));
1142 #else
1143         printk("%s at 0x%08lx on irq %d", hwif->name,
1144                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1145 #endif /* __mc68000__ && CONFIG_APUS */
1146         if (match)
1147                 printk(" (%sed with %s)",
1148                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1149         printk("\n");
1150         up(&ide_cfg_sem);
1151         return 0;
1152 out_unlink:
1153         spin_lock_irq(&ide_lock);
1154         if (hwif->next == hwif) {
1155                 BUG_ON(match);
1156                 BUG_ON(hwgroup->hwif != hwif);
1157                 kfree(hwgroup);
1158         } else {
1159                 ide_hwif_t *g;
1160                 g = hwgroup->hwif;
1161                 while (g->next != hwif)
1162                         g = g->next;
1163                 g->next = hwif->next;
1164                 if (hwgroup->hwif == hwif) {
1165                         /* Impossible. */
1166                         printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1167                         hwgroup->hwif = g;
1168                 }
1169                 BUG_ON(hwgroup->hwif == hwif);
1170         }
1171         spin_unlock_irq(&ide_lock);
1172 out_up:
1173         up(&ide_cfg_sem);
1174         return 1;
1175 }
1176
1177 static int ata_lock(dev_t dev, void *data)
1178 {
1179         /* FIXME: we want to pin hwif down */
1180         return 0;
1181 }
1182
1183 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1184 {
1185         ide_hwif_t *hwif = data;
1186         int unit = *part >> PARTN_BITS;
1187         ide_drive_t *drive = &hwif->drives[unit];
1188         if (!drive->present)
1189                 return NULL;
1190
1191         if (drive->media == ide_disk)
1192                 request_module("ide-disk");
1193         if (drive->scsi)
1194                 request_module("ide-scsi");
1195         if (drive->media == ide_cdrom || drive->media == ide_optical)
1196                 request_module("ide-cd");
1197         if (drive->media == ide_tape)
1198                 request_module("ide-tape");
1199         if (drive->media == ide_floppy)
1200                 request_module("ide-floppy");
1201
1202         return NULL;
1203 }
1204
1205 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1206 {
1207         struct gendisk *p = data;
1208         *part &= (1 << PARTN_BITS) - 1;
1209         return &p->kobj;
1210 }
1211
1212 static int exact_lock(dev_t dev, void *data)
1213 {
1214         struct gendisk *p = data;
1215
1216         if (!get_disk(p))
1217                 return -1;
1218         return 0;
1219 }
1220
1221 void ide_register_region(struct gendisk *disk)
1222 {
1223         blk_register_region(MKDEV(disk->major, disk->first_minor),
1224                             disk->minors, NULL, exact_match, exact_lock, disk);
1225 }
1226
1227 EXPORT_SYMBOL_GPL(ide_register_region);
1228
1229 void ide_unregister_region(struct gendisk *disk)
1230 {
1231         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1232                               disk->minors);
1233 }
1234
1235 EXPORT_SYMBOL_GPL(ide_unregister_region);
1236
1237 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1238 {
1239         ide_hwif_t *hwif = drive->hwif;
1240         unsigned int unit = (drive->select.all >> 4) & 1;
1241
1242         disk->major = hwif->major;
1243         disk->first_minor = unit << PARTN_BITS;
1244         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1245         disk->queue = drive->queue;
1246 }
1247
1248 EXPORT_SYMBOL_GPL(ide_init_disk);
1249
1250 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1251 {
1252         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1253
1254         if (drive == drive->next) {
1255                 /* special case: last drive from hwgroup. */
1256                 BUG_ON(hwgroup->drive != drive);
1257                 hwgroup->drive = NULL;
1258         } else {
1259                 ide_drive_t *walk;
1260
1261                 walk = hwgroup->drive;
1262                 while (walk->next != drive)
1263                         walk = walk->next;
1264                 walk->next = drive->next;
1265                 if (hwgroup->drive == drive) {
1266                         hwgroup->drive = drive->next;
1267                         hwgroup->hwif = hwgroup->drive->hwif;
1268                 }
1269         }
1270         BUG_ON(hwgroup->drive == drive);
1271 }
1272
1273 static void drive_release_dev (struct device *dev)
1274 {
1275         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1276
1277         spin_lock_irq(&ide_lock);
1278         if (drive->devfs_name[0] != '\0') {
1279                 devfs_remove(drive->devfs_name);
1280                 drive->devfs_name[0] = '\0';
1281         }
1282         ide_remove_drive_from_hwgroup(drive);
1283         kfree(drive->id);
1284         drive->id = NULL;
1285         drive->present = 0;
1286         /* Messed up locking ... */
1287         spin_unlock_irq(&ide_lock);
1288         blk_cleanup_queue(drive->queue);
1289         spin_lock_irq(&ide_lock);
1290         drive->queue = NULL;
1291         spin_unlock_irq(&ide_lock);
1292
1293         complete(&drive->gendev_rel_comp);
1294 }
1295
1296 /*
1297  * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1298  * after probing for drives, to allocate partition tables and other data
1299  * structures needed for the routines in genhd.c.  ide_geninit() gets called
1300  * somewhat later, during the partition check.
1301  */
1302 static void init_gendisk (ide_hwif_t *hwif)
1303 {
1304         unsigned int unit;
1305
1306         for (unit = 0; unit < MAX_DRIVES; ++unit) {
1307                 ide_drive_t * drive = &hwif->drives[unit];
1308                 ide_add_generic_settings(drive);
1309                 snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1310                          hwif->index,unit);
1311                 drive->gendev.parent = &hwif->gendev;
1312                 drive->gendev.bus = &ide_bus_type;
1313                 drive->gendev.driver_data = drive;
1314                 drive->gendev.release = drive_release_dev;
1315                 if (drive->present) {
1316                         sprintf(drive->devfs_name, "ide/host%d/bus%d/target%d/lun%d",
1317                                 (hwif->channel && hwif->mate) ?
1318                                 hwif->mate->index : hwif->index,
1319                                 hwif->channel, unit, drive->lun);
1320                 }
1321         }
1322         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1323                         THIS_MODULE, ata_probe, ata_lock, hwif);
1324 }
1325
1326 static int hwif_init(ide_hwif_t *hwif)
1327 {
1328         int old_irq;
1329
1330         /* Return success if no device is connected */
1331         if (!hwif->present)
1332                 return 1;
1333
1334         if (!hwif->irq) {
1335                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1336                 {
1337                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1338                         return (hwif->present = 0);
1339                 }
1340         }
1341 #ifdef CONFIG_BLK_DEV_HD
1342         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1343                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1344                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1345                 return (hwif->present = 0);
1346         }
1347 #endif /* CONFIG_BLK_DEV_HD */
1348
1349         /* we set it back to 1 if all is ok below */
1350         hwif->present = 0;
1351
1352         if (register_blkdev(hwif->major, hwif->name))
1353                 return 0;
1354
1355         if (!hwif->sg_max_nents)
1356                 hwif->sg_max_nents = PRD_ENTRIES;
1357
1358         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1359                                  GFP_KERNEL);
1360         if (!hwif->sg_table) {
1361                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1362                 goto out;
1363         }
1364
1365         if (init_irq(hwif) == 0)
1366                 goto done;
1367
1368         old_irq = hwif->irq;
1369         /*
1370          *      It failed to initialise. Find the default IRQ for
1371          *      this port and try that.
1372          */
1373         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1374                 printk("%s: Disabled unable to get IRQ %d.\n",
1375                         hwif->name, old_irq);
1376                 goto out;
1377         }
1378         if (init_irq(hwif)) {
1379                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1380                         hwif->name, old_irq, hwif->irq);
1381                 goto out;
1382         }
1383         printk("%s: probed IRQ %d failed, using default.\n",
1384                 hwif->name, hwif->irq);
1385
1386 done:
1387         init_gendisk(hwif);
1388         hwif->present = 1;      /* success */
1389         return 1;
1390
1391 out:
1392         unregister_blkdev(hwif->major, hwif->name);
1393         return 0;
1394 }
1395
1396 int ideprobe_init (void)
1397 {
1398         unsigned int index;
1399         int probe[MAX_HWIFS];
1400
1401         memset(probe, 0, MAX_HWIFS * sizeof(int));
1402         for (index = 0; index < MAX_HWIFS; ++index)
1403                 probe[index] = !ide_hwifs[index].present;
1404
1405         for (index = 0; index < MAX_HWIFS; ++index)
1406                 if (probe[index])
1407                         probe_hwif(&ide_hwifs[index]);
1408         for (index = 0; index < MAX_HWIFS; ++index)
1409                 if (probe[index])
1410                         hwif_init(&ide_hwifs[index]);
1411         for (index = 0; index < MAX_HWIFS; ++index) {
1412                 if (probe[index]) {
1413                         ide_hwif_t *hwif = &ide_hwifs[index];
1414                         int unit;
1415                         if (!hwif->present)
1416                                 continue;
1417                         if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1418                                 hwif->chipset = ide_generic;
1419                         for (unit = 0; unit < MAX_DRIVES; ++unit)
1420                                 if (hwif->drives[unit].present)
1421                                         device_register(&hwif->drives[unit].gendev);
1422                 }
1423         }
1424         return 0;
1425 }
1426
1427 EXPORT_SYMBOL_GPL(ideprobe_init);