git.oblomov.eu Git - linux-2.6/blob - drivers/ide/ide-probe.c

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