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

   1 /*
   2  *  Copyright (C) 1994-1998   Linus Torvalds & authors (see below)
   3  *  Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  *  Mostly written by Mark Lord <mlord@pobox.com>
   8  *                and Gadi Oxman <gadio@netvision.net.il>
   9  *                and Andre Hedrick <andre@linux-ide.org>
  10  *
  11  *  See linux/MAINTAINERS for address of current maintainer.
  12  *
  13  * This is the IDE probe module, as evolved from hd.c and ide.c.
  14  *
  15  * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  16  *       by Andrea Arcangeli
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22 #include <linux/kernel.h>
  23 #include <linux/timer.h>
  24 #include <linux/mm.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/major.h>
  27 #include <linux/errno.h>
  28 #include <linux/genhd.h>
  29 #include <linux/slab.h>
  30 #include <linux/delay.h>
  31 #include <linux/ide.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/kmod.h>
  34 #include <linux/pci.h>
  35 #include <linux/scatterlist.h>
  36
  37 #include <asm/byteorder.h>
  38 #include <asm/irq.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/io.h>
  41
  42 /**
  43  *      generic_id              -       add a generic drive id
  44  *      @drive: drive to make an ID block for
  45  *
  46  *      Add a fake id field to the drive we are passed. This allows
  47  *      use to skip a ton of NULL checks (which people always miss)
  48  *      and make drive properties unconditional outside of this file
  49  */
  50
  51 static void generic_id(ide_drive_t *drive)
  52 {
  53         u16 *id = drive->id;
  54
  55         id[ATA_ID_CUR_CYLS]     = id[ATA_ID_CYLS]       = drive->cyl;
  56         id[ATA_ID_CUR_HEADS]    = id[ATA_ID_HEADS]      = drive->head;
  57         id[ATA_ID_CUR_SECTORS]  = id[ATA_ID_SECTORS]    = drive->sect;
  58 }
  59
  60 static void ide_disk_init_chs(ide_drive_t *drive)
  61 {
  62         u16 *id = drive->id;
  63
  64         /* Extract geometry if we did not already have one for the drive */
  65         if (!drive->cyl || !drive->head || !drive->sect) {
  66                 drive->cyl  = drive->bios_cyl  = id[ATA_ID_CYLS];
  67                 drive->head = drive->bios_head = id[ATA_ID_HEADS];
  68                 drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
  69         }
  70
  71         /* Handle logical geometry translation by the drive */
  72         if (ata_id_current_chs_valid(id)) {
  73                 drive->cyl  = id[ATA_ID_CUR_CYLS];
  74                 drive->head = id[ATA_ID_CUR_HEADS];
  75                 drive->sect = id[ATA_ID_CUR_SECTORS];
  76         }
  77
  78         /* Use physical geometry if what we have still makes no sense */
  79         if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
  80                 drive->cyl  = id[ATA_ID_CYLS];
  81                 drive->head = id[ATA_ID_HEADS];
  82                 drive->sect = id[ATA_ID_SECTORS];
  83         }
  84 }
  85
  86 static void ide_disk_init_mult_count(ide_drive_t *drive)
  87 {
  88         u16 *id = drive->id;
  89         u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
  90
  91         if (max_multsect) {
  92                 if ((max_multsect / 2) > 1)
  93                         id[ATA_ID_MULTSECT] = max_multsect | 0x100;
  94                 else
  95                         id[ATA_ID_MULTSECT] &= ~0x1ff;
  96
  97                 drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
  98
  99                 if (drive->mult_req)
 100                         drive->special.b.set_multmode = 1;
 101         }
 102 }
 103
 104 static void ide_classify_ata_dev(ide_drive_t *drive)
 105 {
 106         u16 *id = drive->id;
 107         char *m = (char *)&id[ATA_ID_PROD];
 108         int is_cfa = ata_id_is_cfa(id);
 109
 110         /* CF devices are *not* removable in Linux definition of the term */
 111         if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
 112                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 113
 114         drive->media = ide_disk;
 115
 116         if (!ata_id_has_unload(drive->id))
 117                 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
 118
 119         printk(KERN_INFO "%s: %s, %s DISK drive\n", drive->name, m,
 120                 is_cfa ? "CFA" : "ATA");
 121 }
 122
 123 static void ide_classify_atapi_dev(ide_drive_t *drive)
 124 {
 125         u16 *id = drive->id;
 126         char *m = (char *)&id[ATA_ID_PROD];
 127         u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
 128
 129         printk(KERN_INFO "%s: %s, ATAPI ", drive->name, m);
 130         switch (type) {
 131         case ide_floppy:
 132                 if (!strstr(m, "CD-ROM")) {
 133                         if (!strstr(m, "oppy") &&
 134                             !strstr(m, "poyp") &&
 135                             !strstr(m, "ZIP"))
 136                                 printk(KERN_CONT "cdrom or floppy?, assuming ");
 137                         if (drive->media != ide_cdrom) {
 138                                 printk(KERN_CONT "FLOPPY");
 139                                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 140                                 break;
 141                         }
 142                 }
 143                 /* Early cdrom models used zero */
 144                 type = ide_cdrom;
 145         case ide_cdrom:
 146                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 147 #ifdef CONFIG_PPC
 148                 /* kludge for Apple PowerBook internal zip */
 149                 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
 150                         printk(KERN_CONT "FLOPPY");
 151                         type = ide_floppy;
 152                         break;
 153                 }
 154 #endif
 155                 printk(KERN_CONT "CD/DVD-ROM");
 156                 break;
 157         case ide_tape:
 158                 printk(KERN_CONT "TAPE");
 159                 break;
 160         case ide_optical:
 161                 printk(KERN_CONT "OPTICAL");
 162                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 163                 break;
 164         default:
 165                 printk(KERN_CONT "UNKNOWN (type %d)", type);
 166                 break;
 167         }
 168
 169         printk(KERN_CONT " drive\n");
 170         drive->media = type;
 171         /* an ATAPI device ignores DRDY */
 172         drive->ready_stat = 0;
 173         if (ata_id_cdb_intr(id))
 174                 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
 175         drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
 176         /* we don't do head unloading on ATAPI devices */
 177         drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
 178 }
 179
 180 /**
 181  *      do_identify     -       identify a drive
 182  *      @drive: drive to identify
 183  *      @cmd: command used
 184  *
 185  *      Called when we have issued a drive identify command to
 186  *      read and parse the results. This function is run with
 187  *      interrupts disabled.
 188  */
 189
 190 static void do_identify(ide_drive_t *drive, u8 cmd)
 191 {
 192         ide_hwif_t *hwif = drive->hwif;
 193         u16 *id = drive->id;
 194         char *m = (char *)&id[ATA_ID_PROD];
 195         unsigned long flags;
 196         int bswap = 1;
 197
 198         /* local CPU only; some systems need this */
 199         local_irq_save(flags);
 200         /* read 512 bytes of id info */
 201         hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 202         local_irq_restore(flags);
 203
 204         drive->dev_flags |= IDE_DFLAG_ID_READ;
 205 #ifdef DEBUG
 206         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 207         ide_dump_identify((u8 *)id);
 208 #endif
 209         ide_fix_driveid(id);
 210
 211         /*
 212          *  ATA_CMD_ID_ATA returns little-endian info,
 213          *  ATA_CMD_ID_ATAPI *usually* returns little-endian info.
 214          */
 215         if (cmd == ATA_CMD_ID_ATAPI) {
 216                 if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
 217                     (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
 218                     (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
 219                         /* Vertos drives may still be weird */
 220                         bswap ^= 1;
 221         }
 222
 223         ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
 224         ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
 225         ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
 226
 227         /* we depend on this a lot! */
 228         m[ATA_ID_PROD_LEN - 1] = '\0';
 229
 230         if (strstr(m, "E X A B Y T E N E S T"))
 231                 goto err_misc;
 232
 233         drive->dev_flags |= IDE_DFLAG_PRESENT;
 234         drive->dev_flags &= ~IDE_DFLAG_DEAD;
 235
 236         /*
 237          * Check for an ATAPI device
 238          */
 239         if (cmd == ATA_CMD_ID_ATAPI)
 240                 ide_classify_atapi_dev(drive);
 241         else
 242         /*
 243          * Not an ATAPI device: looks like a "regular" hard disk
 244          */
 245                 ide_classify_ata_dev(drive);
 246         return;
 247 err_misc:
 248         kfree(id);
 249         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 250 }
 251
 252 /**
 253  *      actual_try_to_identify  -       send ata/atapi identify
 254  *      @drive: drive to identify
 255  *      @cmd: command to use
 256  *
 257  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 258  *      and waits for a response.  It also monitors irqs while this is
 259  *      happening, in hope of automatically determining which one is
 260  *      being used by the interface.
 261  *
 262  *      Returns:        0  device was identified
 263  *                      1  device timed-out (no response to identify request)
 264  *                      2  device aborted the command (refused to identify itself)
 265  */
 266
 267 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 268 {
 269         ide_hwif_t *hwif = drive->hwif;
 270         struct ide_io_ports *io_ports = &hwif->io_ports;
 271         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 272         int use_altstatus = 0, rc;
 273         unsigned long timeout;
 274         u8 s = 0, a = 0;
 275
 276         /* take a deep breath */
 277         msleep(50);
 278
 279         if (io_ports->ctl_addr &&
 280             (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
 281                 a = tp_ops->read_altstatus(hwif);
 282                 s = tp_ops->read_status(hwif);
 283                 if ((a ^ s) & ~ATA_IDX)
 284                         /* ancient Seagate drives, broken interfaces */
 285                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 286                                          "instead of ALTSTATUS(0x%02x)\n",
 287                                          drive->name, s, a);
 288                 else
 289                         /* use non-intrusive polling */
 290                         use_altstatus = 1;
 291         }
 292
 293         /* set features register for atapi
 294          * identify command to be sure of reply
 295          */
 296         if (cmd == ATA_CMD_ID_ATAPI) {
 297                 ide_task_t task;
 298
 299                 memset(&task, 0, sizeof(task));
 300                 /* disable DMA & overlap */
 301                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 302
 303                 tp_ops->tf_load(drive, &task);
 304         }
 305
 306         /* ask drive for ID */
 307         tp_ops->exec_command(hwif, cmd);
 308
 309         timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 310
 311         if (ide_busy_sleep(hwif, timeout, use_altstatus))
 312                 return 1;
 313
 314         /* wait for IRQ and ATA_DRQ */
 315         msleep(50);
 316         s = tp_ops->read_status(hwif);
 317
 318         if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
 319                 /* drive returned ID */
 320                 do_identify(drive, cmd);
 321                 /* drive responded with ID */
 322                 rc = 0;
 323                 /* clear drive IRQ */
 324                 (void)tp_ops->read_status(hwif);
 325         } else {
 326                 /* drive refused ID */
 327                 rc = 2;
 328         }
 329         return rc;
 330 }
 331
 332 /**
 333  *      try_to_identify -       try to identify a drive
 334  *      @drive: drive to probe
 335  *      @cmd: command to use
 336  *
 337  *      Issue the identify command and then do IRQ probing to
 338  *      complete the identification when needed by finding the
 339  *      IRQ the drive is attached to
 340  */
 341
 342 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 343 {
 344         ide_hwif_t *hwif = drive->hwif;
 345         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 346         int retval;
 347         int autoprobe = 0;
 348         unsigned long cookie = 0;
 349
 350         /*
 351          * Disable device irq unless we need to
 352          * probe for it. Otherwise we'll get spurious
 353          * interrupts during the identify-phase that
 354          * the irq handler isn't expecting.
 355          */
 356         if (hwif->io_ports.ctl_addr) {
 357                 if (!hwif->irq) {
 358                         autoprobe = 1;
 359                         cookie = probe_irq_on();
 360                 }
 361                 tp_ops->set_irq(hwif, autoprobe);
 362         }
 363
 364         retval = actual_try_to_identify(drive, cmd);
 365
 366         if (autoprobe) {
 367                 int irq;
 368
 369                 tp_ops->set_irq(hwif, 0);
 370                 /* clear drive IRQ */
 371                 (void)tp_ops->read_status(hwif);
 372                 udelay(5);
 373                 irq = probe_irq_off(cookie);
 374                 if (!hwif->irq) {
 375                         if (irq > 0) {
 376                                 hwif->irq = irq;
 377                         } else {
 378                                 /* Mmmm.. multiple IRQs..
 379                                  * don't know which was ours
 380                                  */
 381                                 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
 382                                         drive->name, cookie);
 383                         }
 384                 }
 385         }
 386         return retval;
 387 }
 388
 389 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
 390 {
 391         u8 stat;
 392
 393         timeout += jiffies;
 394
 395         do {
 396                 msleep(50);     /* give drive a breather */
 397                 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
 398                                  : hwif->tp_ops->read_status(hwif);
 399                 if ((stat & ATA_BUSY) == 0)
 400                         return 0;
 401         } while (time_before(jiffies, timeout));
 402
 403         return 1;       /* drive timed-out */
 404 }
 405
 406 static u8 ide_read_device(ide_drive_t *drive)
 407 {
 408         ide_task_t task;
 409
 410         memset(&task, 0, sizeof(task));
 411         task.tf_flags = IDE_TFLAG_IN_DEVICE;
 412
 413         drive->hwif->tp_ops->tf_read(drive, &task);
 414
 415         return task.tf.device;
 416 }
 417
 418 /**
 419  *      do_probe                -       probe an IDE device
 420  *      @drive: drive to probe
 421  *      @cmd: command to use
 422  *
 423  *      do_probe() has the difficult job of finding a drive if it exists,
 424  *      without getting hung up if it doesn't exist, without trampling on
 425  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 426  *
 427  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 428  *      but does not respond right away, the probe will "hang in there"
 429  *      for the maximum wait time (about 30 seconds), otherwise it will
 430  *      exit much more quickly.
 431  *
 432  * Returns:     0  device was identified
 433  *              1  device timed-out (no response to identify request)
 434  *              2  device aborted the command (refused to identify itself)
 435  *              3  bad status from device (possible for ATAPI drives)
 436  *              4  probe was not attempted because failure was obvious
 437  */
 438
 439 static int do_probe (ide_drive_t *drive, u8 cmd)
 440 {
 441         ide_hwif_t *hwif = drive->hwif;
 442         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 443         int rc;
 444         u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
 445
 446         /* avoid waiting for inappropriate probes */
 447         if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
 448                 return 4;
 449
 450 #ifdef DEBUG
 451         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 452                 drive->name, present, drive->media,
 453                 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
 454 #endif
 455
 456         /* needed for some systems
 457          * (e.g. crw9624 as drive0 with disk as slave)
 458          */
 459         msleep(50);
 460         SELECT_DRIVE(drive);
 461         msleep(50);
 462
 463         if (ide_read_device(drive) != drive->select && present == 0) {
 464                 if (drive->dn & 1) {
 465                         /* exit with drive0 selected */
 466                         SELECT_DRIVE(hwif->devices[0]);
 467                         /* allow ATA_BUSY to assert & clear */
 468                         msleep(50);
 469                 }
 470                 /* no i/f present: mmm.. this should be a 4 -ml */
 471                 return 3;
 472         }
 473
 474         stat = tp_ops->read_status(hwif);
 475
 476         if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
 477             present || cmd == ATA_CMD_ID_ATAPI) {
 478                 /* send cmd and wait */
 479                 if ((rc = try_to_identify(drive, cmd))) {
 480                         /* failed: try again */
 481                         rc = try_to_identify(drive,cmd);
 482                 }
 483
 484                 stat = tp_ops->read_status(hwif);
 485
 486                 if (stat == (ATA_BUSY | ATA_DRDY))
 487                         return 4;
 488
 489                 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
 490                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 491                                         "resetting drive\n", drive->name, stat);
 492                         msleep(50);
 493                         SELECT_DRIVE(drive);
 494                         msleep(50);
 495                         tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 496                         (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
 497                         rc = try_to_identify(drive, cmd);
 498                 }
 499
 500                 /* ensure drive IRQ is clear */
 501                 stat = tp_ops->read_status(hwif);
 502
 503                 if (rc == 1)
 504                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 505                                         drive->name, stat);
 506         } else {
 507                 /* not present or maybe ATAPI */
 508                 rc = 3;
 509         }
 510         if (drive->dn & 1) {
 511                 /* exit with drive0 selected */
 512                 SELECT_DRIVE(hwif->devices[0]);
 513                 msleep(50);
 514                 /* ensure drive irq is clear */
 515                 (void)tp_ops->read_status(hwif);
 516         }
 517         return rc;
 518 }
 519
 520 /*
 521  *
 522  */
 523 static void enable_nest (ide_drive_t *drive)
 524 {
 525         ide_hwif_t *hwif = drive->hwif;
 526         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 527         u8 stat;
 528
 529         printk(KERN_INFO "%s: enabling %s -- ",
 530                 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
 531
 532         SELECT_DRIVE(drive);
 533         msleep(50);
 534         tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
 535
 536         if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
 537                 printk(KERN_CONT "failed (timeout)\n");
 538                 return;
 539         }
 540
 541         msleep(50);
 542
 543         stat = tp_ops->read_status(hwif);
 544
 545         if (!OK_STAT(stat, 0, BAD_STAT))
 546                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 547         else
 548                 printk(KERN_CONT "success\n");
 549 }
 550
 551 /**
 552  *      probe_for_drives        -       upper level drive probe
 553  *      @drive: drive to probe for
 554  *
 555  *      probe_for_drive() tests for existence of a given drive using do_probe()
 556  *      and presents things to the user as needed.
 557  *
 558  *      Returns:        0  no device was found
 559  *                      1  device was found
 560  *                         (note: IDE_DFLAG_PRESENT might still be not set)
 561  */
 562
 563 static u8 probe_for_drive(ide_drive_t *drive)
 564 {
 565         char *m;
 566
 567         /*
 568          *      In order to keep things simple we have an id
 569          *      block for all drives at all times. If the device
 570          *      is pre ATA or refuses ATA/ATAPI identify we
 571          *      will add faked data to this.
 572          *
 573          *      Also note that 0 everywhere means "can't do X"
 574          */
 575
 576         drive->dev_flags &= ~IDE_DFLAG_ID_READ;
 577
 578         drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
 579         if (drive->id == NULL) {
 580                 printk(KERN_ERR "ide: out of memory for id data.\n");
 581                 return 0;
 582         }
 583
 584         m = (char *)&drive->id[ATA_ID_PROD];
 585         strcpy(m, "UNKNOWN");
 586
 587         /* skip probing? */
 588         if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
 589 retry:
 590                 /* if !(success||timed-out) */
 591                 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
 592                         /* look for ATAPI device */
 593                         (void)do_probe(drive, ATA_CMD_ID_ATAPI);
 594
 595                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 596                         /* drive not found */
 597                         return 0;
 598
 599                 if (strstr(m, "E X A B Y T E N E S T")) {
 600                         enable_nest(drive);
 601                         goto retry;
 602                 }
 603
 604                 /* identification failed? */
 605                 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 606                         if (drive->media == ide_disk) {
 607                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 608                                         drive->name, drive->cyl,
 609                                         drive->head, drive->sect);
 610                         } else if (drive->media == ide_cdrom) {
 611                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 612                         } else {
 613                                 /* nuke it */
 614                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 615                                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 616                         }
 617                 }
 618                 /* drive was found */
 619         }
 620
 621         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 622                 return 0;
 623
 624         /* The drive wasn't being helpful. Add generic info only */
 625         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 626                 generic_id(drive);
 627                 return 1;
 628         }
 629
 630         if (drive->media == ide_disk) {
 631                 ide_disk_init_chs(drive);
 632                 ide_disk_init_mult_count(drive);
 633         }
 634
 635         return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
 636 }
 637
 638 static void hwif_release_dev(struct device *dev)
 639 {
 640         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 641
 642         complete(&hwif->gendev_rel_comp);
 643 }
 644
 645 static int ide_register_port(ide_hwif_t *hwif)
 646 {
 647         int ret;
 648
 649         /* register with global device tree */
 650         dev_set_name(&hwif->gendev, hwif->name);
 651         hwif->gendev.driver_data = hwif;
 652         hwif->gendev.parent = hwif->dev;
 653         hwif->gendev.release = hwif_release_dev;
 654
 655         ret = device_register(&hwif->gendev);
 656         if (ret < 0) {
 657                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 658                         __func__, ret);
 659                 goto out;
 660         }
 661
 662         hwif->portdev = device_create(ide_port_class, &hwif->gendev,
 663                                       MKDEV(0, 0), hwif, hwif->name);
 664         if (IS_ERR(hwif->portdev)) {
 665                 ret = PTR_ERR(hwif->portdev);
 666                 device_unregister(&hwif->gendev);
 667         }
 668 out:
 669         return ret;
 670 }
 671
 672 /**
 673  *      ide_port_wait_ready     -       wait for port to become ready
 674  *      @hwif: IDE port
 675  *
 676  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 677  *      platforms.  Typical cases are:
 678  *
 679  *      - The firmware hard reset the disk before booting the kernel,
 680  *        the drive is still doing it's poweron-reset sequence, that
 681  *        can take up to 30 seconds.
 682  *
 683  *      - The firmware does nothing (or no firmware), the device is
 684  *        still in POST state (same as above actually).
 685  *
 686  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 687  *        their reset sequence even when they are non-selected slave
 688  *        devices, thus preventing discovery of the main HD.
 689  *
 690  *      Doing this wait-for-non-busy should not harm any existing
 691  *      configuration and fix some issues like the above.
 692  *
 693  *      BenH.
 694  *
 695  *      Returns 0 on success, error code (< 0) otherwise.
 696  */
 697
 698 static int ide_port_wait_ready(ide_hwif_t *hwif)
 699 {
 700         ide_drive_t *drive;
 701         int i, rc;
 702
 703         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 704
 705         /* Let HW settle down a bit from whatever init state we
 706          * come from */
 707         mdelay(2);
 708
 709         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 710          * I know of at least one disk who takes 31 seconds, I use 35
 711          * here to be safe
 712          */
 713         rc = ide_wait_not_busy(hwif, 35000);
 714         if (rc)
 715                 return rc;
 716
 717         /* Now make sure both master & slave are ready */
 718         ide_port_for_each_dev(i, drive, hwif) {
 719                 /* Ignore disks that we will not probe for later. */
 720                 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
 721                     (drive->dev_flags & IDE_DFLAG_PRESENT)) {
 722                         SELECT_DRIVE(drive);
 723                         hwif->tp_ops->set_irq(hwif, 1);
 724                         mdelay(2);
 725                         rc = ide_wait_not_busy(hwif, 35000);
 726                         if (rc)
 727                                 goto out;
 728                 } else
 729                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 730                                           drive->name);
 731         }
 732 out:
 733         /* Exit function with master reselected (let's be sane) */
 734         if (i)
 735                 SELECT_DRIVE(hwif->devices[0]);
 736
 737         return rc;
 738 }
 739
 740 /**
 741  *      ide_undecoded_slave     -       look for bad CF adapters
 742  *      @dev1: slave device
 743  *
 744  *      Analyse the drives on the interface and attempt to decide if we
 745  *      have the same drive viewed twice. This occurs with crap CF adapters
 746  *      and PCMCIA sometimes.
 747  */
 748
 749 void ide_undecoded_slave(ide_drive_t *dev1)
 750 {
 751         ide_drive_t *dev0 = dev1->hwif->devices[0];
 752
 753         if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
 754                 return;
 755
 756         /* If the models don't match they are not the same product */
 757         if (strcmp((char *)&dev0->id[ATA_ID_PROD],
 758                    (char *)&dev1->id[ATA_ID_PROD]))
 759                 return;
 760
 761         /* Serial numbers do not match */
 762         if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
 763                     (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
 764                 return;
 765
 766         /* No serial number, thankfully very rare for CF */
 767         if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
 768                 return;
 769
 770         /* Appears to be an IDE flash adapter with decode bugs */
 771         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 772
 773         dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
 774 }
 775
 776 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 777
 778 static int ide_probe_port(ide_hwif_t *hwif)
 779 {
 780         ide_drive_t *drive;
 781         unsigned long flags;
 782         unsigned int irqd;
 783         int i, rc = -ENODEV;
 784
 785         BUG_ON(hwif->present);
 786
 787         if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
 788             (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE))
 789                 return -EACCES;
 790
 791         /*
 792          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 793          * we'll install our IRQ driver much later...
 794          */
 795         irqd = hwif->irq;
 796         if (irqd)
 797                 disable_irq(hwif->irq);
 798
 799         local_save_flags(flags);
 800         local_irq_enable_in_hardirq();
 801
 802         if (ide_port_wait_ready(hwif) == -EBUSY)
 803                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 804
 805         /*
 806          * Second drive should only exist if first drive was found,
 807          * but a lot of cdrom drives are configured as single slaves.
 808          */
 809         ide_port_for_each_dev(i, drive, hwif) {
 810                 (void) probe_for_drive(drive);
 811                 if (drive->dev_flags & IDE_DFLAG_PRESENT)
 812                         rc = 0;
 813         }
 814
 815         local_irq_restore(flags);
 816
 817         /*
 818          * Use cached IRQ number. It might be (and is...) changed by probe
 819          * code above
 820          */
 821         if (irqd)
 822                 enable_irq(irqd);
 823
 824         return rc;
 825 }
 826
 827 static void ide_port_tune_devices(ide_hwif_t *hwif)
 828 {
 829         const struct ide_port_ops *port_ops = hwif->port_ops;
 830         ide_drive_t *drive;
 831         int i;
 832
 833         ide_port_for_each_dev(i, drive, hwif) {
 834                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 835                         if (port_ops && port_ops->quirkproc)
 836                                 port_ops->quirkproc(drive);
 837                 }
 838         }
 839
 840         ide_port_for_each_dev(i, drive, hwif) {
 841                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 842                         ide_set_max_pio(drive);
 843
 844                         drive->dev_flags |= IDE_DFLAG_NICE1;
 845
 846                         if (hwif->dma_ops)
 847                                 ide_set_dma(drive);
 848                 }
 849         }
 850
 851         ide_port_for_each_dev(i, drive, hwif) {
 852                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
 853                         drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
 854                 else
 855                         drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
 856         }
 857 }
 858
 859 /*
 860  * init request queue
 861  */
 862 static int ide_init_queue(ide_drive_t *drive)
 863 {
 864         struct request_queue *q;
 865         ide_hwif_t *hwif = drive->hwif;
 866         int max_sectors = 256;
 867         int max_sg_entries = PRD_ENTRIES;
 868
 869         /*
 870          *      Our default set up assumes the normal IDE case,
 871          *      that is 64K segmenting, standard PRD setup
 872          *      and LBA28. Some drivers then impose their own
 873          *      limits and LBA48 we could raise it but as yet
 874          *      do not.
 875          */
 876
 877         q = blk_init_queue_node(do_ide_request, NULL, hwif_to_node(hwif));
 878         if (!q)
 879                 return 1;
 880
 881         q->queuedata = drive;
 882         blk_queue_segment_boundary(q, 0xffff);
 883
 884         if (hwif->rqsize < max_sectors)
 885                 max_sectors = hwif->rqsize;
 886         blk_queue_max_sectors(q, max_sectors);
 887
 888 #ifdef CONFIG_PCI
 889         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 890          * creates segments that don't completely match our boundary
 891          * requirements and thus need to be broken up again. Because it
 892          * doesn't align properly either, we may actually have to break up
 893          * to more segments than what was we got in the first place, a max
 894          * worst case is twice as many.
 895          * This will be fixed once we teach pci_map_sg() about our boundary
 896          * requirements, hopefully soon. *FIXME*
 897          */
 898         if (!PCI_DMA_BUS_IS_PHYS)
 899                 max_sg_entries >>= 1;
 900 #endif /* CONFIG_PCI */
 901
 902         blk_queue_max_hw_segments(q, max_sg_entries);
 903         blk_queue_max_phys_segments(q, max_sg_entries);
 904
 905         /* assign drive queue */
 906         drive->queue = q;
 907
 908         /* needs drive->queue to be set */
 909         ide_toggle_bounce(drive, 1);
 910
 911         return 0;
 912 }
 913
 914 static DEFINE_MUTEX(ide_cfg_mtx);
 915
 916 /*
 917  * For any present drive:
 918  * - allocate the block device queue
 919  */
 920 static int ide_port_setup_devices(ide_hwif_t *hwif)
 921 {
 922         ide_drive_t *drive;
 923         int i, j = 0;
 924
 925         mutex_lock(&ide_cfg_mtx);
 926         ide_port_for_each_dev(i, drive, hwif) {
 927                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 928                         continue;
 929
 930                 if (ide_init_queue(drive)) {
 931                         printk(KERN_ERR "ide: failed to init %s\n",
 932                                         drive->name);
 933                         kfree(drive->id);
 934                         drive->id = NULL;
 935                         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 936                         continue;
 937                 }
 938
 939                 j++;
 940         }
 941         mutex_unlock(&ide_cfg_mtx);
 942
 943         return j;
 944 }
 945
 946 /*
 947  * This routine sets up the IRQ for an IDE interface.
 948  */
 949 static int init_irq (ide_hwif_t *hwif)
 950 {
 951         struct ide_io_ports *io_ports = &hwif->io_ports;
 952         int sa = 0;
 953
 954         mutex_lock(&ide_cfg_mtx);
 955         spin_lock_init(&hwif->lock);
 956
 957         init_timer(&hwif->timer);
 958         hwif->timer.function = &ide_timer_expiry;
 959         hwif->timer.data = (unsigned long)hwif;
 960
 961 #if defined(__mc68000__)
 962         sa = IRQF_SHARED;
 963 #endif /* __mc68000__ */
 964
 965         if (hwif->chipset == ide_pci)
 966                 sa = IRQF_SHARED;
 967
 968         if (io_ports->ctl_addr)
 969                 hwif->tp_ops->set_irq(hwif, 1);
 970
 971         if (request_irq(hwif->irq, &ide_intr, sa, hwif->name, hwif))
 972                 goto out_up;
 973
 974         if (!hwif->rqsize) {
 975                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
 976                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
 977                         hwif->rqsize = 256;
 978                 else
 979                         hwif->rqsize = 65536;
 980         }
 981
 982 #if !defined(__mc68000__)
 983         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
 984                 io_ports->data_addr, io_ports->status_addr,
 985                 io_ports->ctl_addr, hwif->irq);
 986 #else
 987         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
 988                 io_ports->data_addr, hwif->irq);
 989 #endif /* __mc68000__ */
 990         if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
 991                 printk(KERN_CONT " (serialized)");
 992         printk(KERN_CONT "\n");
 993
 994         mutex_unlock(&ide_cfg_mtx);
 995         return 0;
 996 out_up:
 997         mutex_unlock(&ide_cfg_mtx);
 998         return 1;
 999 }
1000
1001 static int ata_lock(dev_t dev, void *data)
1002 {
1003         /* FIXME: we want to pin hwif down */
1004         return 0;
1005 }
1006
1007 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1008 {
1009         ide_hwif_t *hwif = data;
1010         int unit = *part >> PARTN_BITS;
1011         ide_drive_t *drive = hwif->devices[unit];
1012
1013         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1014                 return NULL;
1015
1016         if (drive->media == ide_disk)
1017                 request_module("ide-disk");
1018         if (drive->media == ide_cdrom || drive->media == ide_optical)
1019                 request_module("ide-cd");
1020         if (drive->media == ide_tape)
1021                 request_module("ide-tape");
1022         if (drive->media == ide_floppy)
1023                 request_module("ide-floppy");
1024
1025         return NULL;
1026 }
1027
1028 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1029 {
1030         struct gendisk *p = data;
1031         *part &= (1 << PARTN_BITS) - 1;
1032         return &disk_to_dev(p)->kobj;
1033 }
1034
1035 static int exact_lock(dev_t dev, void *data)
1036 {
1037         struct gendisk *p = data;
1038
1039         if (!get_disk(p))
1040                 return -1;
1041         return 0;
1042 }
1043
1044 void ide_register_region(struct gendisk *disk)
1045 {
1046         blk_register_region(MKDEV(disk->major, disk->first_minor),
1047                             disk->minors, NULL, exact_match, exact_lock, disk);
1048 }
1049
1050 EXPORT_SYMBOL_GPL(ide_register_region);
1051
1052 void ide_unregister_region(struct gendisk *disk)
1053 {
1054         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1055                               disk->minors);
1056 }
1057
1058 EXPORT_SYMBOL_GPL(ide_unregister_region);
1059
1060 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1061 {
1062         ide_hwif_t *hwif = drive->hwif;
1063         unsigned int unit = drive->dn & 1;
1064
1065         disk->major = hwif->major;
1066         disk->first_minor = unit << PARTN_BITS;
1067         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1068         disk->queue = drive->queue;
1069 }
1070
1071 EXPORT_SYMBOL_GPL(ide_init_disk);
1072
1073 static void drive_release_dev (struct device *dev)
1074 {
1075         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1076         ide_hwif_t *hwif = drive->hwif;
1077
1078         ide_proc_unregister_device(drive);
1079
1080         spin_lock_irq(&hwif->lock);
1081         kfree(drive->id);
1082         drive->id = NULL;
1083         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1084         /* Messed up locking ... */
1085         spin_unlock_irq(&hwif->lock);
1086         blk_cleanup_queue(drive->queue);
1087         spin_lock_irq(&hwif->lock);
1088         drive->queue = NULL;
1089         spin_unlock_irq(&hwif->lock);
1090
1091         complete(&drive->gendev_rel_comp);
1092 }
1093
1094 static int hwif_init(ide_hwif_t *hwif)
1095 {
1096         int old_irq;
1097
1098         if (!hwif->irq) {
1099                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1100                 if (!hwif->irq) {
1101                         printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1102                         return 0;
1103                 }
1104         }
1105
1106         if (register_blkdev(hwif->major, hwif->name))
1107                 return 0;
1108
1109         if (!hwif->sg_max_nents)
1110                 hwif->sg_max_nents = PRD_ENTRIES;
1111
1112         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1113                                  GFP_KERNEL);
1114         if (!hwif->sg_table) {
1115                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1116                 goto out;
1117         }
1118
1119         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1120
1121         if (init_irq(hwif) == 0)
1122                 goto done;
1123
1124         old_irq = hwif->irq;
1125         /*
1126          *      It failed to initialise. Find the default IRQ for
1127          *      this port and try that.
1128          */
1129         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1130         if (!hwif->irq) {
1131                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1132                         hwif->name, old_irq);
1133                 goto out;
1134         }
1135         if (init_irq(hwif)) {
1136                 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1137                         hwif->name, old_irq, hwif->irq);
1138                 goto out;
1139         }
1140         printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1141                 hwif->name, hwif->irq);
1142
1143 done:
1144         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1145                             THIS_MODULE, ata_probe, ata_lock, hwif);
1146         return 1;
1147
1148 out:
1149         unregister_blkdev(hwif->major, hwif->name);
1150         return 0;
1151 }
1152
1153 static void hwif_register_devices(ide_hwif_t *hwif)
1154 {
1155         ide_drive_t *drive;
1156         unsigned int i;
1157
1158         ide_port_for_each_dev(i, drive, hwif) {
1159                 struct device *dev = &drive->gendev;
1160                 int ret;
1161
1162                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1163                         continue;
1164
1165                 dev_set_name(dev, "%u.%u", hwif->index, i);
1166                 dev->parent = &hwif->gendev;
1167                 dev->bus = &ide_bus_type;
1168                 dev->driver_data = drive;
1169                 dev->release = drive_release_dev;
1170
1171                 ret = device_register(dev);
1172                 if (ret < 0)
1173                         printk(KERN_WARNING "IDE: %s: device_register error: "
1174                                             "%d\n", __func__, ret);
1175         }
1176 }
1177
1178 static void ide_port_init_devices(ide_hwif_t *hwif)
1179 {
1180         const struct ide_port_ops *port_ops = hwif->port_ops;
1181         ide_drive_t *drive;
1182         int i;
1183
1184         ide_port_for_each_dev(i, drive, hwif) {
1185                 drive->dn = i + hwif->channel * 2;
1186
1187                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1188                         drive->io_32bit = 1;
1189                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1190                         drive->dev_flags |= IDE_DFLAG_UNMASK;
1191                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1192                         drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1193
1194                 if (port_ops && port_ops->init_dev)
1195                         port_ops->init_dev(drive);
1196         }
1197 }
1198
1199 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1200                           const struct ide_port_info *d)
1201 {
1202         hwif->channel = port;
1203
1204         if (d->chipset)
1205                 hwif->chipset = d->chipset;
1206
1207         if (d->init_iops)
1208                 d->init_iops(hwif);
1209
1210         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1211             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1212                 hwif->irq = port ? 15 : 14;
1213
1214         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1215         hwif->host_flags |= d->host_flags;
1216         hwif->pio_mask = d->pio_mask;
1217
1218         if (d->tp_ops)
1219                 hwif->tp_ops = d->tp_ops;
1220
1221         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1222         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1223                 hwif->port_ops = d->port_ops;
1224
1225         hwif->swdma_mask = d->swdma_mask;
1226         hwif->mwdma_mask = d->mwdma_mask;
1227         hwif->ultra_mask = d->udma_mask;
1228
1229         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1230                 int rc;
1231
1232                 hwif->dma_ops = d->dma_ops;
1233
1234                 if (d->init_dma)
1235                         rc = d->init_dma(hwif, d);
1236                 else
1237                         rc = ide_hwif_setup_dma(hwif, d);
1238
1239                 if (rc < 0) {
1240                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1241
1242                         hwif->dma_ops = NULL;
1243                         hwif->dma_base = 0;
1244                         hwif->swdma_mask = 0;
1245                         hwif->mwdma_mask = 0;
1246                         hwif->ultra_mask = 0;
1247                 }
1248         }
1249
1250         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1251             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
1252                 hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
1253
1254         if (d->max_sectors)
1255                 hwif->rqsize = d->max_sectors;
1256
1257         /* call chipset specific routine for each enabled port */
1258         if (d->init_hwif)
1259                 d->init_hwif(hwif);
1260 }
1261
1262 static void ide_port_cable_detect(ide_hwif_t *hwif)
1263 {
1264         const struct ide_port_ops *port_ops = hwif->port_ops;
1265
1266         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1267                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1268                         hwif->cbl = port_ops->cable_detect(hwif);
1269         }
1270 }
1271
1272 static const u8 ide_hwif_to_major[] =
1273         { IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
1274           IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
1275
1276 static void ide_port_init_devices_data(ide_hwif_t *hwif)
1277 {
1278         ide_drive_t *drive;
1279         int i;
1280
1281         ide_port_for_each_dev(i, drive, hwif) {
1282                 u8 j = (hwif->index * MAX_DRIVES) + i;
1283
1284                 memset(drive, 0, sizeof(*drive));
1285
1286                 drive->media                    = ide_disk;
1287                 drive->select                   = (i << 4) | ATA_DEVICE_OBS;
1288                 drive->hwif                     = hwif;
1289                 drive->ready_stat               = ATA_DRDY;
1290                 drive->bad_wstat                = BAD_W_STAT;
1291                 drive->special.b.recalibrate    = 1;
1292                 drive->special.b.set_geometry   = 1;
1293                 drive->name[0]                  = 'h';
1294                 drive->name[1]                  = 'd';
1295                 drive->name[2]                  = 'a' + j;
1296                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
1297
1298                 INIT_LIST_HEAD(&drive->list);
1299                 init_completion(&drive->gendev_rel_comp);
1300         }
1301 }
1302
1303 static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
1304 {
1305         /* fill in any non-zero initial values */
1306         hwif->index     = index;
1307         hwif->major     = ide_hwif_to_major[index];
1308
1309         hwif->name[0]   = 'i';
1310         hwif->name[1]   = 'd';
1311         hwif->name[2]   = 'e';
1312         hwif->name[3]   = '0' + index;
1313
1314         init_completion(&hwif->gendev_rel_comp);
1315
1316         hwif->tp_ops = &default_tp_ops;
1317
1318         ide_port_init_devices_data(hwif);
1319 }
1320
1321 static void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
1322 {
1323         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
1324         hwif->irq = hw->irq;
1325         hwif->chipset = hw->chipset;
1326         hwif->dev = hw->dev;
1327         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
1328         hwif->ack_intr = hw->ack_intr;
1329         hwif->config_data = hw->config;
1330 }
1331
1332 static unsigned int ide_indexes;
1333
1334 /**
1335  *      ide_find_port_slot      -       find free port slot
1336  *      @d: IDE port info
1337  *
1338  *      Return the new port slot index or -ENOENT if we are out of free slots.
1339  */
1340
1341 static int ide_find_port_slot(const struct ide_port_info *d)
1342 {
1343         int idx = -ENOENT;
1344         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1345         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1346
1347         /*
1348          * Claim an unassigned slot.
1349          *
1350          * Give preference to claiming other slots before claiming ide0/ide1,
1351          * just in case there's another interface yet-to-be-scanned
1352          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1353          *
1354          * Unless there is a bootable card that does not use the standard
1355          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1356          */
1357         mutex_lock(&ide_cfg_mtx);
1358         if (bootable) {
1359                 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1360                         idx = ffz(ide_indexes | i);
1361         } else {
1362                 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1363                         idx = ffz(ide_indexes | 3);
1364                 else if ((ide_indexes & 3) != 3)
1365                         idx = ffz(ide_indexes);
1366         }
1367         if (idx >= 0)
1368                 ide_indexes |= (1 << idx);
1369         mutex_unlock(&ide_cfg_mtx);
1370
1371         return idx;
1372 }
1373
1374 static void ide_free_port_slot(int idx)
1375 {
1376         mutex_lock(&ide_cfg_mtx);
1377         ide_indexes &= ~(1 << idx);
1378         mutex_unlock(&ide_cfg_mtx);
1379 }
1380
1381 static void ide_port_free_devices(ide_hwif_t *hwif)
1382 {
1383         ide_drive_t *drive;
1384         int i;
1385
1386         ide_port_for_each_dev(i, drive, hwif)
1387                 kfree(drive);
1388 }
1389
1390 static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
1391 {
1392         int i;
1393
1394         for (i = 0; i < MAX_DRIVES; i++) {
1395                 ide_drive_t *drive;
1396
1397                 drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
1398                 if (drive == NULL)
1399                         goto out_nomem;
1400
1401                 hwif->devices[i] = drive;
1402         }
1403         return 0;
1404
1405 out_nomem:
1406         ide_port_free_devices(hwif);
1407         return -ENOMEM;
1408 }
1409
1410 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1411 {
1412         struct ide_host *host;
1413         struct device *dev = hws[0] ? hws[0]->dev : NULL;
1414         int node = dev ? dev_to_node(dev) : -1;
1415         int i;
1416
1417         host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
1418         if (host == NULL)
1419                 return NULL;
1420
1421         for (i = 0; i < MAX_HOST_PORTS; i++) {
1422                 ide_hwif_t *hwif;
1423                 int idx;
1424
1425                 if (hws[i] == NULL)
1426                         continue;
1427
1428                 hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
1429                 if (hwif == NULL)
1430                         continue;
1431
1432                 if (ide_port_alloc_devices(hwif, node) < 0) {
1433                         kfree(hwif);
1434                         continue;
1435                 }
1436
1437                 idx = ide_find_port_slot(d);
1438                 if (idx < 0) {
1439                         printk(KERN_ERR "%s: no free slot for interface\n",
1440                                         d ? d->name : "ide");
1441                         kfree(hwif);
1442                         continue;
1443                 }
1444
1445                 ide_init_port_data(hwif, idx);
1446
1447                 hwif->host = host;
1448
1449                 host->ports[i] = hwif;
1450                 host->n_ports++;
1451         }
1452
1453         if (host->n_ports == 0) {
1454                 kfree(host);
1455                 return NULL;
1456         }
1457
1458         host->dev[0] = dev;
1459
1460         if (d) {
1461                 host->init_chipset = d->init_chipset;
1462                 host->host_flags = d->host_flags;
1463         }
1464
1465         return host;
1466 }
1467 EXPORT_SYMBOL_GPL(ide_host_alloc);
1468
1469 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1470                       hw_regs_t **hws)
1471 {
1472         ide_hwif_t *hwif, *mate = NULL;
1473         int i, j = 0;
1474
1475         ide_host_for_each_port(i, hwif, host) {
1476                 if (hwif == NULL) {
1477                         mate = NULL;
1478                         continue;
1479                 }
1480
1481                 ide_init_port_hw(hwif, hws[i]);
1482                 ide_port_apply_params(hwif);
1483
1484                 if (d == NULL) {
1485                         mate = NULL;
1486                 } else {
1487                         if ((i & 1) && mate) {
1488                                 hwif->mate = mate;
1489                                 mate->mate = hwif;
1490                         }
1491
1492                         mate = (i & 1) ? NULL : hwif;
1493
1494                         ide_init_port(hwif, i & 1, d);
1495                         ide_port_cable_detect(hwif);
1496                 }
1497
1498                 ide_port_init_devices(hwif);
1499         }
1500
1501         ide_host_for_each_port(i, hwif, host) {
1502                 if (hwif == NULL)
1503                         continue;
1504
1505                 if (ide_probe_port(hwif) == 0)
1506                         hwif->present = 1;
1507
1508                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1509                     !hwif->mate->present)
1510                         ide_register_port(hwif);
1511
1512                 if (hwif->present)
1513                         ide_port_tune_devices(hwif);
1514         }
1515
1516         ide_host_for_each_port(i, hwif, host) {
1517                 if (hwif == NULL)
1518                         continue;
1519
1520                 if (hwif_init(hwif) == 0) {
1521                         printk(KERN_INFO "%s: failed to initialize IDE "
1522                                          "interface\n", hwif->name);
1523                         hwif->present = 0;
1524                         continue;
1525                 }
1526
1527                 if (hwif->present)
1528                         if (ide_port_setup_devices(hwif) == 0) {
1529                                 hwif->present = 0;
1530                                 continue;
1531                         }
1532
1533                 j++;
1534
1535                 ide_acpi_init(hwif);
1536
1537                 if (hwif->present)
1538                         ide_acpi_port_init_devices(hwif);
1539         }
1540
1541         ide_host_for_each_port(i, hwif, host) {
1542                 if (hwif == NULL)
1543                         continue;
1544
1545                 if (hwif->present)
1546                         hwif_register_devices(hwif);
1547         }
1548
1549         ide_host_for_each_port(i, hwif, host) {
1550                 if (hwif == NULL)
1551                         continue;
1552
1553                 ide_sysfs_register_port(hwif);
1554                 ide_proc_register_port(hwif);
1555
1556                 if (hwif->present)
1557                         ide_proc_port_register_devices(hwif);
1558         }
1559
1560         return j ? 0 : -1;
1561 }
1562 EXPORT_SYMBOL_GPL(ide_host_register);
1563
1564 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1565                  struct ide_host **hostp)
1566 {
1567         struct ide_host *host;
1568         int rc;
1569
1570         host = ide_host_alloc(d, hws);
1571         if (host == NULL)
1572                 return -ENOMEM;
1573
1574         rc = ide_host_register(host, d, hws);
1575         if (rc) {
1576                 ide_host_free(host);
1577                 return rc;
1578         }
1579
1580         if (hostp)
1581                 *hostp = host;
1582
1583         return 0;
1584 }
1585 EXPORT_SYMBOL_GPL(ide_host_add);
1586
1587 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
1588 {
1589         ide_drive_t *drive;
1590         int i;
1591
1592         ide_port_for_each_dev(i, drive, hwif) {
1593                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
1594                         device_unregister(&drive->gendev);
1595                         wait_for_completion(&drive->gendev_rel_comp);
1596                 }
1597         }
1598 }
1599
1600 void ide_port_unregister_devices(ide_hwif_t *hwif)
1601 {
1602         mutex_lock(&ide_cfg_mtx);
1603         __ide_port_unregister_devices(hwif);
1604         hwif->present = 0;
1605         ide_port_init_devices_data(hwif);
1606         mutex_unlock(&ide_cfg_mtx);
1607 }
1608 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
1609
1610 /**
1611  *      ide_unregister          -       free an IDE interface
1612  *      @hwif: IDE interface
1613  *
1614  *      Perform the final unregister of an IDE interface.
1615  *
1616  *      Locking:
1617  *      The caller must not hold the IDE locks.
1618  *
1619  *      It is up to the caller to be sure there is no pending I/O here,
1620  *      and that the interface will not be reopened (present/vanishing
1621  *      locking isn't yet done BTW).
1622  */
1623
1624 static void ide_unregister(ide_hwif_t *hwif)
1625 {
1626         BUG_ON(in_interrupt());
1627         BUG_ON(irqs_disabled());
1628
1629         mutex_lock(&ide_cfg_mtx);
1630
1631         if (hwif->present) {
1632                 __ide_port_unregister_devices(hwif);
1633                 hwif->present = 0;
1634         }
1635
1636         ide_proc_unregister_port(hwif);
1637
1638         free_irq(hwif->irq, hwif);
1639
1640         device_unregister(hwif->portdev);
1641         device_unregister(&hwif->gendev);
1642         wait_for_completion(&hwif->gendev_rel_comp);
1643
1644         /*
1645          * Remove us from the kernel's knowledge
1646          */
1647         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
1648         kfree(hwif->sg_table);
1649         unregister_blkdev(hwif->major, hwif->name);
1650
1651         ide_release_dma_engine(hwif);
1652
1653         mutex_unlock(&ide_cfg_mtx);
1654 }
1655
1656 void ide_host_free(struct ide_host *host)
1657 {
1658         ide_hwif_t *hwif;
1659         int i;
1660
1661         ide_host_for_each_port(i, hwif, host) {
1662                 if (hwif == NULL)
1663                         continue;
1664
1665                 ide_port_free_devices(hwif);
1666                 ide_free_port_slot(hwif->index);
1667                 kfree(hwif);
1668         }
1669
1670         kfree(host);
1671 }
1672 EXPORT_SYMBOL_GPL(ide_host_free);
1673
1674 void ide_host_remove(struct ide_host *host)
1675 {
1676         ide_hwif_t *hwif;
1677         int i;
1678
1679         ide_host_for_each_port(i, hwif, host) {
1680                 if (hwif)
1681                         ide_unregister(hwif);
1682         }
1683
1684         ide_host_free(host);
1685 }
1686 EXPORT_SYMBOL_GPL(ide_host_remove);
1687
1688 void ide_port_scan(ide_hwif_t *hwif)
1689 {
1690         ide_port_apply_params(hwif);
1691         ide_port_cable_detect(hwif);
1692         ide_port_init_devices(hwif);
1693
1694         if (ide_probe_port(hwif) < 0)
1695                 return;
1696
1697         hwif->present = 1;
1698
1699         ide_port_tune_devices(hwif);
1700         ide_port_setup_devices(hwif);
1701         ide_acpi_port_init_devices(hwif);
1702         hwif_register_devices(hwif);
1703         ide_proc_port_register_devices(hwif);
1704 }
1705 EXPORT_SYMBOL_GPL(ide_port_scan);