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 /**
 105  *      do_identify     -       identify a drive
 106  *      @drive: drive to identify
 107  *      @cmd: command used
 108  *
 109  *      Called when we have issued a drive identify command to
 110  *      read and parse the results. This function is run with
 111  *      interrupts disabled.
 112  */
 113
 114 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 115 {
 116         ide_hwif_t *hwif = HWIF(drive);
 117         u16 *id = drive->id;
 118         char *m = (char *)&id[ATA_ID_PROD];
 119         int bswap = 1, is_cfa;
 120
 121         /* read 512 bytes of id info */
 122         hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 123
 124         drive->dev_flags |= IDE_DFLAG_ID_READ;
 125
 126         local_irq_enable();
 127 #ifdef DEBUG
 128         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 129         ide_dump_identify((u8 *)id);
 130 #endif
 131         ide_fix_driveid(id);
 132
 133         /*
 134          *  ATA_CMD_ID_ATA returns little-endian info,
 135          *  ATA_CMD_ID_ATAPI *usually* returns little-endian info.
 136          */
 137         if (cmd == ATA_CMD_ID_ATAPI) {
 138                 if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
 139                     (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
 140                     (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
 141                         /* Vertos drives may still be weird */
 142                         bswap ^= 1;
 143         }
 144
 145         ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
 146         ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
 147         ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
 148
 149         /* we depend on this a lot! */
 150         m[ATA_ID_PROD_LEN - 1] = '\0';
 151
 152         if (strstr(m, "E X A B Y T E N E S T"))
 153                 goto err_misc;
 154
 155         printk(KERN_INFO "%s: %s, ", drive->name, m);
 156
 157         drive->dev_flags |= IDE_DFLAG_PRESENT;
 158         drive->dev_flags &= ~IDE_DFLAG_DEAD;
 159
 160         /*
 161          * Check for an ATAPI device
 162          */
 163         if (cmd == ATA_CMD_ID_ATAPI) {
 164                 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
 165
 166                 printk(KERN_CONT "ATAPI ");
 167                 switch (type) {
 168                         case ide_floppy:
 169                                 if (!strstr(m, "CD-ROM")) {
 170                                         if (!strstr(m, "oppy") &&
 171                                             !strstr(m, "poyp") &&
 172                                             !strstr(m, "ZIP"))
 173                                                 printk(KERN_CONT "cdrom or floppy?, assuming ");
 174                                         if (drive->media != ide_cdrom) {
 175                                                 printk(KERN_CONT "FLOPPY");
 176                                                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 177                                                 break;
 178                                         }
 179                                 }
 180                                 /* Early cdrom models used zero */
 181                                 type = ide_cdrom;
 182                         case ide_cdrom:
 183                                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 184 #ifdef CONFIG_PPC
 185                                 /* kludge for Apple PowerBook internal zip */
 186                                 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
 187                                         printk(KERN_CONT "FLOPPY");
 188                                         type = ide_floppy;
 189                                         break;
 190                                 }
 191 #endif
 192                                 printk(KERN_CONT "CD/DVD-ROM");
 193                                 break;
 194                         case ide_tape:
 195                                 printk(KERN_CONT "TAPE");
 196                                 break;
 197                         case ide_optical:
 198                                 printk(KERN_CONT "OPTICAL");
 199                                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 200                                 break;
 201                         default:
 202                                 printk(KERN_CONT "UNKNOWN (type %d)", type);
 203                                 break;
 204                 }
 205                 printk(KERN_CONT " drive\n");
 206                 drive->media = type;
 207                 /* an ATAPI device ignores DRDY */
 208                 drive->ready_stat = 0;
 209                 if (ata_id_cdb_intr(id))
 210                         drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
 211                 drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
 212                 /* we don't do head unloading on ATAPI devices */
 213                 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
 214                 return;
 215         }
 216
 217         /*
 218          * Not an ATAPI device: looks like a "regular" hard disk
 219          */
 220
 221         is_cfa = ata_id_is_cfa(id);
 222
 223         /* CF devices are *not* removable in Linux definition of the term */
 224         if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
 225                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 226
 227         drive->media = ide_disk;
 228
 229         if (!ata_id_has_unload(drive->id))
 230                 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
 231
 232         printk(KERN_CONT "%s DISK drive\n", is_cfa ? "CFA" : "ATA");
 233
 234         return;
 235
 236 err_misc:
 237         kfree(id);
 238         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 239         return;
 240 }
 241
 242 /**
 243  *      actual_try_to_identify  -       send ata/atapi identify
 244  *      @drive: drive to identify
 245  *      @cmd: command to use
 246  *
 247  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 248  *      and waits for a response.  It also monitors irqs while this is
 249  *      happening, in hope of automatically determining which one is
 250  *      being used by the interface.
 251  *
 252  *      Returns:        0  device was identified
 253  *                      1  device timed-out (no response to identify request)
 254  *                      2  device aborted the command (refused to identify itself)
 255  */
 256
 257 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 258 {
 259         ide_hwif_t *hwif = HWIF(drive);
 260         struct ide_io_ports *io_ports = &hwif->io_ports;
 261         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 262         int use_altstatus = 0, rc;
 263         unsigned long timeout;
 264         u8 s = 0, a = 0;
 265
 266         /* take a deep breath */
 267         msleep(50);
 268
 269         if (io_ports->ctl_addr &&
 270             (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
 271                 a = tp_ops->read_altstatus(hwif);
 272                 s = tp_ops->read_status(hwif);
 273                 if ((a ^ s) & ~ATA_IDX)
 274                         /* ancient Seagate drives, broken interfaces */
 275                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 276                                          "instead of ALTSTATUS(0x%02x)\n",
 277                                          drive->name, s, a);
 278                 else
 279                         /* use non-intrusive polling */
 280                         use_altstatus = 1;
 281         }
 282
 283         /* set features register for atapi
 284          * identify command to be sure of reply
 285          */
 286         if (cmd == ATA_CMD_ID_ATAPI) {
 287                 ide_task_t task;
 288
 289                 memset(&task, 0, sizeof(task));
 290                 /* disable DMA & overlap */
 291                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 292
 293                 tp_ops->tf_load(drive, &task);
 294         }
 295
 296         /* ask drive for ID */
 297         tp_ops->exec_command(hwif, cmd);
 298
 299         timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 300
 301         if (ide_busy_sleep(hwif, timeout, use_altstatus))
 302                 return 1;
 303
 304         /* wait for IRQ and ATA_DRQ */
 305         msleep(50);
 306         s = tp_ops->read_status(hwif);
 307
 308         if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
 309                 unsigned long flags;
 310
 311                 /* local CPU only; some systems need this */
 312                 local_irq_save(flags);
 313                 /* drive returned ID */
 314                 do_identify(drive, cmd);
 315                 /* drive responded with ID */
 316                 rc = 0;
 317                 /* clear drive IRQ */
 318                 (void)tp_ops->read_status(hwif);
 319                 local_irq_restore(flags);
 320         } else {
 321                 /* drive refused ID */
 322                 rc = 2;
 323         }
 324         return rc;
 325 }
 326
 327 /**
 328  *      try_to_identify -       try to identify a drive
 329  *      @drive: drive to probe
 330  *      @cmd: command to use
 331  *
 332  *      Issue the identify command and then do IRQ probing to
 333  *      complete the identification when needed by finding the
 334  *      IRQ the drive is attached to
 335  */
 336
 337 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 338 {
 339         ide_hwif_t *hwif = HWIF(drive);
 340         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 341         int retval;
 342         int autoprobe = 0;
 343         unsigned long cookie = 0;
 344
 345         /*
 346          * Disable device irq unless we need to
 347          * probe for it. Otherwise we'll get spurious
 348          * interrupts during the identify-phase that
 349          * the irq handler isn't expecting.
 350          */
 351         if (hwif->io_ports.ctl_addr) {
 352                 if (!hwif->irq) {
 353                         autoprobe = 1;
 354                         cookie = probe_irq_on();
 355                 }
 356                 tp_ops->set_irq(hwif, autoprobe);
 357         }
 358
 359         retval = actual_try_to_identify(drive, cmd);
 360
 361         if (autoprobe) {
 362                 int irq;
 363
 364                 tp_ops->set_irq(hwif, 0);
 365                 /* clear drive IRQ */
 366                 (void)tp_ops->read_status(hwif);
 367                 udelay(5);
 368                 irq = probe_irq_off(cookie);
 369                 if (!hwif->irq) {
 370                         if (irq > 0) {
 371                                 hwif->irq = irq;
 372                         } else {
 373                                 /* Mmmm.. multiple IRQs..
 374                                  * don't know which was ours
 375                                  */
 376                                 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
 377                                         drive->name, cookie);
 378                         }
 379                 }
 380         }
 381         return retval;
 382 }
 383
 384 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
 385 {
 386         u8 stat;
 387
 388         timeout += jiffies;
 389
 390         do {
 391                 msleep(50);     /* give drive a breather */
 392                 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
 393                                  : hwif->tp_ops->read_status(hwif);
 394                 if ((stat & ATA_BUSY) == 0)
 395                         return 0;
 396         } while (time_before(jiffies, timeout));
 397
 398         return 1;       /* drive timed-out */
 399 }
 400
 401 static u8 ide_read_device(ide_drive_t *drive)
 402 {
 403         ide_task_t task;
 404
 405         memset(&task, 0, sizeof(task));
 406         task.tf_flags = IDE_TFLAG_IN_DEVICE;
 407
 408         drive->hwif->tp_ops->tf_read(drive, &task);
 409
 410         return task.tf.device;
 411 }
 412
 413 /**
 414  *      do_probe                -       probe an IDE device
 415  *      @drive: drive to probe
 416  *      @cmd: command to use
 417  *
 418  *      do_probe() has the difficult job of finding a drive if it exists,
 419  *      without getting hung up if it doesn't exist, without trampling on
 420  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 421  *
 422  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 423  *      but does not respond right away, the probe will "hang in there"
 424  *      for the maximum wait time (about 30 seconds), otherwise it will
 425  *      exit much more quickly.
 426  *
 427  * Returns:     0  device was identified
 428  *              1  device timed-out (no response to identify request)
 429  *              2  device aborted the command (refused to identify itself)
 430  *              3  bad status from device (possible for ATAPI drives)
 431  *              4  probe was not attempted because failure was obvious
 432  */
 433
 434 static int do_probe (ide_drive_t *drive, u8 cmd)
 435 {
 436         ide_hwif_t *hwif = HWIF(drive);
 437         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 438         int rc;
 439         u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
 440
 441         /* avoid waiting for inappropriate probes */
 442         if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
 443                 return 4;
 444
 445 #ifdef DEBUG
 446         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 447                 drive->name, present, drive->media,
 448                 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
 449 #endif
 450
 451         /* needed for some systems
 452          * (e.g. crw9624 as drive0 with disk as slave)
 453          */
 454         msleep(50);
 455         SELECT_DRIVE(drive);
 456         msleep(50);
 457
 458         if (ide_read_device(drive) != drive->select && present == 0) {
 459                 if (drive->dn & 1) {
 460                         /* exit with drive0 selected */
 461                         SELECT_DRIVE(&hwif->drives[0]);
 462                         /* allow ATA_BUSY to assert & clear */
 463                         msleep(50);
 464                 }
 465                 /* no i/f present: mmm.. this should be a 4 -ml */
 466                 return 3;
 467         }
 468
 469         stat = tp_ops->read_status(hwif);
 470
 471         if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
 472             present || cmd == ATA_CMD_ID_ATAPI) {
 473                 /* send cmd and wait */
 474                 if ((rc = try_to_identify(drive, cmd))) {
 475                         /* failed: try again */
 476                         rc = try_to_identify(drive,cmd);
 477                 }
 478
 479                 stat = tp_ops->read_status(hwif);
 480
 481                 if (stat == (ATA_BUSY | ATA_DRDY))
 482                         return 4;
 483
 484                 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
 485                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 486                                         "resetting drive\n", drive->name, stat);
 487                         msleep(50);
 488                         SELECT_DRIVE(drive);
 489                         msleep(50);
 490                         tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 491                         (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
 492                         rc = try_to_identify(drive, cmd);
 493                 }
 494
 495                 /* ensure drive IRQ is clear */
 496                 stat = tp_ops->read_status(hwif);
 497
 498                 if (rc == 1)
 499                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 500                                         drive->name, stat);
 501         } else {
 502                 /* not present or maybe ATAPI */
 503                 rc = 3;
 504         }
 505         if (drive->dn & 1) {
 506                 /* exit with drive0 selected */
 507                 SELECT_DRIVE(&hwif->drives[0]);
 508                 msleep(50);
 509                 /* ensure drive irq is clear */
 510                 (void)tp_ops->read_status(hwif);
 511         }
 512         return rc;
 513 }
 514
 515 /*
 516  *
 517  */
 518 static void enable_nest (ide_drive_t *drive)
 519 {
 520         ide_hwif_t *hwif = HWIF(drive);
 521         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 522         u8 stat;
 523
 524         printk(KERN_INFO "%s: enabling %s -- ",
 525                 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
 526
 527         SELECT_DRIVE(drive);
 528         msleep(50);
 529         tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
 530
 531         if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
 532                 printk(KERN_CONT "failed (timeout)\n");
 533                 return;
 534         }
 535
 536         msleep(50);
 537
 538         stat = tp_ops->read_status(hwif);
 539
 540         if (!OK_STAT(stat, 0, BAD_STAT))
 541                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 542         else
 543                 printk(KERN_CONT "success\n");
 544 }
 545
 546 /**
 547  *      probe_for_drives        -       upper level drive probe
 548  *      @drive: drive to probe for
 549  *
 550  *      probe_for_drive() tests for existence of a given drive using do_probe()
 551  *      and presents things to the user as needed.
 552  *
 553  *      Returns:        0  no device was found
 554  *                      1  device was found
 555  *                         (note: IDE_DFLAG_PRESENT might still be not set)
 556  */
 557
 558 static inline u8 probe_for_drive (ide_drive_t *drive)
 559 {
 560         char *m;
 561
 562         /*
 563          *      In order to keep things simple we have an id
 564          *      block for all drives at all times. If the device
 565          *      is pre ATA or refuses ATA/ATAPI identify we
 566          *      will add faked data to this.
 567          *
 568          *      Also note that 0 everywhere means "can't do X"
 569          */
 570
 571         drive->dev_flags &= ~IDE_DFLAG_ID_READ;
 572
 573         drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
 574         if (drive->id == NULL) {
 575                 printk(KERN_ERR "ide: out of memory for id data.\n");
 576                 return 0;
 577         }
 578
 579         m = (char *)&drive->id[ATA_ID_PROD];
 580         strcpy(m, "UNKNOWN");
 581
 582         /* skip probing? */
 583         if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
 584 retry:
 585                 /* if !(success||timed-out) */
 586                 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
 587                         /* look for ATAPI device */
 588                         (void)do_probe(drive, ATA_CMD_ID_ATAPI);
 589
 590                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 591                         /* drive not found */
 592                         return 0;
 593
 594                 if (strstr(m, "E X A B Y T E N E S T")) {
 595                         enable_nest(drive);
 596                         goto retry;
 597                 }
 598
 599                 /* identification failed? */
 600                 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 601                         if (drive->media == ide_disk) {
 602                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 603                                         drive->name, drive->cyl,
 604                                         drive->head, drive->sect);
 605                         } else if (drive->media == ide_cdrom) {
 606                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 607                         } else {
 608                                 /* nuke it */
 609                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 610                                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 611                         }
 612                 }
 613                 /* drive was found */
 614         }
 615
 616         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 617                 return 0;
 618
 619         /* The drive wasn't being helpful. Add generic info only */
 620         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 621                 generic_id(drive);
 622                 return 1;
 623         }
 624
 625         if (drive->media == ide_disk) {
 626                 ide_disk_init_chs(drive);
 627                 ide_disk_init_mult_count(drive);
 628         }
 629
 630         return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
 631 }
 632
 633 static void hwif_release_dev(struct device *dev)
 634 {
 635         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 636
 637         complete(&hwif->gendev_rel_comp);
 638 }
 639
 640 static int ide_register_port(ide_hwif_t *hwif)
 641 {
 642         int ret;
 643
 644         /* register with global device tree */
 645         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 646         hwif->gendev.driver_data = hwif;
 647         if (hwif->gendev.parent == NULL) {
 648                 if (hwif->dev)
 649                         hwif->gendev.parent = hwif->dev;
 650                 else
 651                         /* Would like to do = &device_legacy */
 652                         hwif->gendev.parent = NULL;
 653         }
 654         hwif->gendev.release = hwif_release_dev;
 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         int unit, rc;
 701
 702         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 703
 704         /* Let HW settle down a bit from whatever init state we
 705          * come from */
 706         mdelay(2);
 707
 708         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 709          * I know of at least one disk who takes 31 seconds, I use 35
 710          * here to be safe
 711          */
 712         rc = ide_wait_not_busy(hwif, 35000);
 713         if (rc)
 714                 return rc;
 715
 716         /* Now make sure both master & slave are ready */
 717         for (unit = 0; unit < MAX_DRIVES; unit++) {
 718                 ide_drive_t *drive = &hwif->drives[unit];
 719
 720                 /* Ignore disks that we will not probe for later. */
 721                 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
 722                     (drive->dev_flags & IDE_DFLAG_PRESENT)) {
 723                         SELECT_DRIVE(drive);
 724                         hwif->tp_ops->set_irq(hwif, 1);
 725                         mdelay(2);
 726                         rc = ide_wait_not_busy(hwif, 35000);
 727                         if (rc)
 728                                 goto out;
 729                 } else
 730                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 731                                           drive->name);
 732         }
 733 out:
 734         /* Exit function with master reselected (let's be sane) */
 735         if (unit)
 736                 SELECT_DRIVE(&hwif->drives[0]);
 737
 738         return rc;
 739 }
 740
 741 /**
 742  *      ide_undecoded_slave     -       look for bad CF adapters
 743  *      @dev1: slave device
 744  *
 745  *      Analyse the drives on the interface and attempt to decide if we
 746  *      have the same drive viewed twice. This occurs with crap CF adapters
 747  *      and PCMCIA sometimes.
 748  */
 749
 750 void ide_undecoded_slave(ide_drive_t *dev1)
 751 {
 752         ide_drive_t *dev0 = &dev1->hwif->drives[0];
 753
 754         if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
 755                 return;
 756
 757         /* If the models don't match they are not the same product */
 758         if (strcmp((char *)&dev0->id[ATA_ID_PROD],
 759                    (char *)&dev1->id[ATA_ID_PROD]))
 760                 return;
 761
 762         /* Serial numbers do not match */
 763         if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
 764                     (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
 765                 return;
 766
 767         /* No serial number, thankfully very rare for CF */
 768         if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
 769                 return;
 770
 771         /* Appears to be an IDE flash adapter with decode bugs */
 772         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 773
 774         dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
 775 }
 776
 777 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 778
 779 static int ide_probe_port(ide_hwif_t *hwif)
 780 {
 781         unsigned long flags;
 782         unsigned int irqd;
 783         int unit, rc = -ENODEV;
 784
 785         BUG_ON(hwif->present);
 786
 787         if ((hwif->drives[0].dev_flags & IDE_DFLAG_NOPROBE) &&
 788             (hwif->drives[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_irq_set(flags);
 800
 801         if (ide_port_wait_ready(hwif) == -EBUSY)
 802                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 803
 804         /*
 805          * Second drive should only exist if first drive was found,
 806          * but a lot of cdrom drives are configured as single slaves.
 807          */
 808         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 809                 ide_drive_t *drive = &hwif->drives[unit];
 810
 811                 (void) probe_for_drive(drive);
 812                 if (drive->dev_flags & IDE_DFLAG_PRESENT)
 813                         rc = 0;
 814         }
 815
 816         local_irq_restore(flags);
 817
 818         /*
 819          * Use cached IRQ number. It might be (and is...) changed by probe
 820          * code above
 821          */
 822         if (irqd)
 823                 enable_irq(irqd);
 824
 825         return rc;
 826 }
 827
 828 static void ide_port_tune_devices(ide_hwif_t *hwif)
 829 {
 830         const struct ide_port_ops *port_ops = hwif->port_ops;
 831         int unit;
 832
 833         for (unit = 0; unit < MAX_DRIVES; unit++) {
 834                 ide_drive_t *drive = &hwif->drives[unit];
 835
 836                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 837                         if (port_ops && port_ops->quirkproc)
 838                                 port_ops->quirkproc(drive);
 839                 }
 840         }
 841
 842         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 843                 ide_drive_t *drive = &hwif->drives[unit];
 844
 845                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 846                         ide_set_max_pio(drive);
 847
 848                         drive->dev_flags |= IDE_DFLAG_NICE1;
 849
 850                         if (hwif->dma_ops)
 851                                 ide_set_dma(drive);
 852                 }
 853         }
 854
 855         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 856                 ide_drive_t *drive = &hwif->drives[unit];
 857
 858                 if ((hwif->host_flags & IDE_HFLAG_NO_IO_32BIT) ||
 859                     drive->id[ATA_ID_DWORD_IO])
 860                         drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
 861                 else
 862                         drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
 863         }
 864 }
 865
 866 /*
 867  * save_match() is used to simplify logic in init_irq() below.
 868  *
 869  * A loophole here is that we may not know about a particular
 870  * hwif's irq until after that hwif is actually probed/initialized..
 871  * This could be a problem for the case where an hwif is on a
 872  * dual interface that requires serialization (eg. cmd640) and another
 873  * hwif using one of the same irqs is initialized beforehand.
 874  *
 875  * This routine detects and reports such situations, but does not fix them.
 876  */
 877 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 878 {
 879         ide_hwif_t *m = *match;
 880
 881         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 882                 if (!new->hwgroup)
 883                         return;
 884                 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
 885                         hwif->name, new->name, m->name);
 886         }
 887         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 888                 *match = new;
 889 }
 890
 891 /*
 892  * init request queue
 893  */
 894 static int ide_init_queue(ide_drive_t *drive)
 895 {
 896         struct request_queue *q;
 897         ide_hwif_t *hwif = HWIF(drive);
 898         int max_sectors = 256;
 899         int max_sg_entries = PRD_ENTRIES;
 900
 901         /*
 902          *      Our default set up assumes the normal IDE case,
 903          *      that is 64K segmenting, standard PRD setup
 904          *      and LBA28. Some drivers then impose their own
 905          *      limits and LBA48 we could raise it but as yet
 906          *      do not.
 907          */
 908
 909         q = blk_init_queue_node(do_ide_request, &hwif->hwgroup->lock,
 910                                 hwif_to_node(hwif));
 911         if (!q)
 912                 return 1;
 913
 914         q->queuedata = drive;
 915         blk_queue_segment_boundary(q, 0xffff);
 916
 917         if (hwif->rqsize < max_sectors)
 918                 max_sectors = hwif->rqsize;
 919         blk_queue_max_sectors(q, max_sectors);
 920
 921 #ifdef CONFIG_PCI
 922         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 923          * creates segments that don't completely match our boundary
 924          * requirements and thus need to be broken up again. Because it
 925          * doesn't align properly either, we may actually have to break up
 926          * to more segments than what was we got in the first place, a max
 927          * worst case is twice as many.
 928          * This will be fixed once we teach pci_map_sg() about our boundary
 929          * requirements, hopefully soon. *FIXME*
 930          */
 931         if (!PCI_DMA_BUS_IS_PHYS)
 932                 max_sg_entries >>= 1;
 933 #endif /* CONFIG_PCI */
 934
 935         blk_queue_max_hw_segments(q, max_sg_entries);
 936         blk_queue_max_phys_segments(q, max_sg_entries);
 937
 938         /* assign drive queue */
 939         drive->queue = q;
 940
 941         /* needs drive->queue to be set */
 942         ide_toggle_bounce(drive, 1);
 943
 944         return 0;
 945 }
 946
 947 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 948 {
 949         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 950
 951         spin_lock_irq(&hwgroup->lock);
 952         if (!hwgroup->drive) {
 953                 /* first drive for hwgroup. */
 954                 drive->next = drive;
 955                 hwgroup->drive = drive;
 956                 hwgroup->hwif = HWIF(hwgroup->drive);
 957         } else {
 958                 drive->next = hwgroup->drive->next;
 959                 hwgroup->drive->next = drive;
 960         }
 961         spin_unlock_irq(&hwgroup->lock);
 962 }
 963
 964 /*
 965  * For any present drive:
 966  * - allocate the block device queue
 967  * - link drive into the hwgroup
 968  */
 969 static int ide_port_setup_devices(ide_hwif_t *hwif)
 970 {
 971         int i, j = 0;
 972
 973         mutex_lock(&ide_cfg_mtx);
 974         for (i = 0; i < MAX_DRIVES; i++) {
 975                 ide_drive_t *drive = &hwif->drives[i];
 976
 977                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 978                         continue;
 979
 980                 if (ide_init_queue(drive)) {
 981                         printk(KERN_ERR "ide: failed to init %s\n",
 982                                         drive->name);
 983                         kfree(drive->id);
 984                         drive->id = NULL;
 985                         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 986                         continue;
 987                 }
 988
 989                 j++;
 990
 991                 ide_add_drive_to_hwgroup(drive);
 992         }
 993         mutex_unlock(&ide_cfg_mtx);
 994
 995         return j;
 996 }
 997
 998 static ide_hwif_t *ide_ports[MAX_HWIFS];
 999
1000 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
1001 {
1002         ide_hwgroup_t *hwgroup = hwif->hwgroup;
1003
1004         ide_ports[hwif->index] = NULL;
1005
1006         spin_lock_irq(&hwgroup->lock);
1007         /*
1008          * Remove us from the hwgroup, and free
1009          * the hwgroup if we were the only member
1010          */
1011         if (hwif->next == hwif) {
1012                 BUG_ON(hwgroup->hwif != hwif);
1013                 kfree(hwgroup);
1014         } else {
1015                 /* There is another interface in hwgroup.
1016                  * Unlink us, and set hwgroup->drive and ->hwif to
1017                  * something sane.
1018                  */
1019                 ide_hwif_t *g = hwgroup->hwif;
1020
1021                 while (g->next != hwif)
1022                         g = g->next;
1023                 g->next = hwif->next;
1024                 if (hwgroup->hwif == hwif) {
1025                         /* Chose a random hwif for hwgroup->hwif.
1026                          * It's guaranteed that there are no drives
1027                          * left in the hwgroup.
1028                          */
1029                         BUG_ON(hwgroup->drive != NULL);
1030                         hwgroup->hwif = g;
1031                 }
1032                 BUG_ON(hwgroup->hwif == hwif);
1033         }
1034         spin_unlock_irq(&hwgroup->lock);
1035 }
1036
1037 /*
1038  * This routine sets up the irq for an ide interface, and creates a new
1039  * hwgroup for the irq/hwif if none was previously assigned.
1040  *
1041  * Much of the code is for correctly detecting/handling irq sharing
1042  * and irq serialization situations.  This is somewhat complex because
1043  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1044  */
1045 static int init_irq (ide_hwif_t *hwif)
1046 {
1047         struct ide_io_ports *io_ports = &hwif->io_ports;
1048         unsigned int index;
1049         ide_hwgroup_t *hwgroup;
1050         ide_hwif_t *match = NULL;
1051
1052         mutex_lock(&ide_cfg_mtx);
1053         hwif->hwgroup = NULL;
1054
1055         /*
1056          * Group up with any other hwifs that share our irq(s).
1057          */
1058         for (index = 0; index < MAX_HWIFS; index++) {
1059                 ide_hwif_t *h = ide_ports[index];
1060
1061                 if (h && h->hwgroup) {  /* scan only initialized ports */
1062                         if (hwif->irq == h->irq) {
1063                                 hwif->sharing_irq = h->sharing_irq = 1;
1064                                 if (hwif->chipset != ide_pci ||
1065                                     h->chipset != ide_pci) {
1066                                         save_match(hwif, h, &match);
1067                                 }
1068                         }
1069                         if (hwif->serialized) {
1070                                 if (hwif->mate && hwif->mate->irq == h->irq)
1071                                         save_match(hwif, h, &match);
1072                         }
1073                         if (h->serialized) {
1074                                 if (h->mate && hwif->irq == h->mate->irq)
1075                                         save_match(hwif, h, &match);
1076                         }
1077                 }
1078         }
1079
1080         /*
1081          * If we are still without a hwgroup, then form a new one
1082          */
1083         if (match) {
1084                 hwgroup = match->hwgroup;
1085                 hwif->hwgroup = hwgroup;
1086                 /*
1087                  * Link us into the hwgroup.
1088                  * This must be done early, do ensure that unexpected_intr
1089                  * can find the hwif and prevent irq storms.
1090                  * No drives are attached to the new hwif, choose_drive
1091                  * can't do anything stupid (yet).
1092                  * Add ourself as the 2nd entry to the hwgroup->hwif
1093                  * linked list, the first entry is the hwif that owns
1094                  * hwgroup->handler - do not change that.
1095                  */
1096                 spin_lock_irq(&hwgroup->lock);
1097                 hwif->next = hwgroup->hwif->next;
1098                 hwgroup->hwif->next = hwif;
1099                 BUG_ON(hwif->next == hwif);
1100                 spin_unlock_irq(&hwgroup->lock);
1101         } else {
1102                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1103                                        hwif_to_node(hwif));
1104                 if (hwgroup == NULL)
1105                         goto out_up;
1106
1107                 spin_lock_init(&hwgroup->lock);
1108
1109                 hwif->hwgroup = hwgroup;
1110                 hwgroup->hwif = hwif->next = hwif;
1111
1112                 init_timer(&hwgroup->timer);
1113                 hwgroup->timer.function = &ide_timer_expiry;
1114                 hwgroup->timer.data = (unsigned long) hwgroup;
1115         }
1116
1117         ide_ports[hwif->index] = hwif;
1118
1119         /*
1120          * Allocate the irq, if not already obtained for another hwif
1121          */
1122         if (!match || match->irq != hwif->irq) {
1123                 int sa = 0;
1124 #if defined(__mc68000__)
1125                 sa = IRQF_SHARED;
1126 #endif /* __mc68000__ */
1127
1128                 if (hwif->chipset == ide_pci || hwif->chipset == ide_cmd646 ||
1129                     hwif->chipset == ide_ali14xx)
1130                         sa = IRQF_SHARED;
1131
1132                 if (io_ports->ctl_addr)
1133                         hwif->tp_ops->set_irq(hwif, 1);
1134
1135                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1136                         goto out_unlink;
1137         }
1138
1139         if (!hwif->rqsize) {
1140                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1141                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1142                         hwif->rqsize = 256;
1143                 else
1144                         hwif->rqsize = 65536;
1145         }
1146
1147 #if !defined(__mc68000__)
1148         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1149                 io_ports->data_addr, io_ports->status_addr,
1150                 io_ports->ctl_addr, hwif->irq);
1151 #else
1152         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1153                 io_ports->data_addr, hwif->irq);
1154 #endif /* __mc68000__ */
1155         if (match)
1156                 printk(KERN_CONT " (%sed with %s)",
1157                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1158         printk(KERN_CONT "\n");
1159
1160         mutex_unlock(&ide_cfg_mtx);
1161         return 0;
1162 out_unlink:
1163         ide_remove_port_from_hwgroup(hwif);
1164 out_up:
1165         mutex_unlock(&ide_cfg_mtx);
1166         return 1;
1167 }
1168
1169 static int ata_lock(dev_t dev, void *data)
1170 {
1171         /* FIXME: we want to pin hwif down */
1172         return 0;
1173 }
1174
1175 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1176 {
1177         ide_hwif_t *hwif = data;
1178         int unit = *part >> PARTN_BITS;
1179         ide_drive_t *drive = &hwif->drives[unit];
1180
1181         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1182                 return NULL;
1183
1184         if (drive->media == ide_disk)
1185                 request_module("ide-disk");
1186         if (drive->dev_flags & IDE_DFLAG_SCSI)
1187                 request_module("ide-scsi");
1188         if (drive->media == ide_cdrom || drive->media == ide_optical)
1189                 request_module("ide-cd");
1190         if (drive->media == ide_tape)
1191                 request_module("ide-tape");
1192         if (drive->media == ide_floppy)
1193                 request_module("ide-floppy");
1194
1195         return NULL;
1196 }
1197
1198 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1199 {
1200         struct gendisk *p = data;
1201         *part &= (1 << PARTN_BITS) - 1;
1202         return &disk_to_dev(p)->kobj;
1203 }
1204
1205 static int exact_lock(dev_t dev, void *data)
1206 {
1207         struct gendisk *p = data;
1208
1209         if (!get_disk(p))
1210                 return -1;
1211         return 0;
1212 }
1213
1214 void ide_register_region(struct gendisk *disk)
1215 {
1216         blk_register_region(MKDEV(disk->major, disk->first_minor),
1217                             disk->minors, NULL, exact_match, exact_lock, disk);
1218 }
1219
1220 EXPORT_SYMBOL_GPL(ide_register_region);
1221
1222 void ide_unregister_region(struct gendisk *disk)
1223 {
1224         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1225                               disk->minors);
1226 }
1227
1228 EXPORT_SYMBOL_GPL(ide_unregister_region);
1229
1230 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1231 {
1232         ide_hwif_t *hwif = drive->hwif;
1233         unsigned int unit = drive->dn & 1;
1234
1235         disk->major = hwif->major;
1236         disk->first_minor = unit << PARTN_BITS;
1237         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1238         disk->queue = drive->queue;
1239 }
1240
1241 EXPORT_SYMBOL_GPL(ide_init_disk);
1242
1243 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1244 {
1245         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1246
1247         if (drive == drive->next) {
1248                 /* special case: last drive from hwgroup. */
1249                 BUG_ON(hwgroup->drive != drive);
1250                 hwgroup->drive = NULL;
1251         } else {
1252                 ide_drive_t *walk;
1253
1254                 walk = hwgroup->drive;
1255                 while (walk->next != drive)
1256                         walk = walk->next;
1257                 walk->next = drive->next;
1258                 if (hwgroup->drive == drive) {
1259                         hwgroup->drive = drive->next;
1260                         hwgroup->hwif = hwgroup->drive->hwif;
1261                 }
1262         }
1263         BUG_ON(hwgroup->drive == drive);
1264 }
1265
1266 static void drive_release_dev (struct device *dev)
1267 {
1268         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1269         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1270
1271         ide_proc_unregister_device(drive);
1272
1273         spin_lock_irq(&hwgroup->lock);
1274         ide_remove_drive_from_hwgroup(drive);
1275         kfree(drive->id);
1276         drive->id = NULL;
1277         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1278         /* Messed up locking ... */
1279         spin_unlock_irq(&hwgroup->lock);
1280         blk_cleanup_queue(drive->queue);
1281         spin_lock_irq(&hwgroup->lock);
1282         drive->queue = NULL;
1283         spin_unlock_irq(&hwgroup->lock);
1284
1285         complete(&drive->gendev_rel_comp);
1286 }
1287
1288 static int hwif_init(ide_hwif_t *hwif)
1289 {
1290         int old_irq;
1291
1292         if (!hwif->irq) {
1293                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1294                 if (!hwif->irq) {
1295                         printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1296                         return 0;
1297                 }
1298         }
1299
1300         if (register_blkdev(hwif->major, hwif->name))
1301                 return 0;
1302
1303         if (!hwif->sg_max_nents)
1304                 hwif->sg_max_nents = PRD_ENTRIES;
1305
1306         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1307                                  GFP_KERNEL);
1308         if (!hwif->sg_table) {
1309                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1310                 goto out;
1311         }
1312
1313         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1314
1315         if (init_irq(hwif) == 0)
1316                 goto done;
1317
1318         old_irq = hwif->irq;
1319         /*
1320          *      It failed to initialise. Find the default IRQ for
1321          *      this port and try that.
1322          */
1323         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1324         if (!hwif->irq) {
1325                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1326                         hwif->name, old_irq);
1327                 goto out;
1328         }
1329         if (init_irq(hwif)) {
1330                 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1331                         hwif->name, old_irq, hwif->irq);
1332                 goto out;
1333         }
1334         printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1335                 hwif->name, hwif->irq);
1336
1337 done:
1338         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1339                             THIS_MODULE, ata_probe, ata_lock, hwif);
1340         return 1;
1341
1342 out:
1343         unregister_blkdev(hwif->major, hwif->name);
1344         return 0;
1345 }
1346
1347 static void hwif_register_devices(ide_hwif_t *hwif)
1348 {
1349         unsigned int i;
1350
1351         for (i = 0; i < MAX_DRIVES; i++) {
1352                 ide_drive_t *drive = &hwif->drives[i];
1353                 struct device *dev = &drive->gendev;
1354                 int ret;
1355
1356                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1357                         continue;
1358
1359                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1360                 dev->parent = &hwif->gendev;
1361                 dev->bus = &ide_bus_type;
1362                 dev->driver_data = drive;
1363                 dev->release = drive_release_dev;
1364
1365                 ret = device_register(dev);
1366                 if (ret < 0)
1367                         printk(KERN_WARNING "IDE: %s: device_register error: "
1368                                             "%d\n", __func__, ret);
1369         }
1370 }
1371
1372 static void ide_port_init_devices(ide_hwif_t *hwif)
1373 {
1374         const struct ide_port_ops *port_ops = hwif->port_ops;
1375         int i;
1376
1377         for (i = 0; i < MAX_DRIVES; i++) {
1378                 ide_drive_t *drive = &hwif->drives[i];
1379
1380                 drive->dn = i + hwif->channel * 2;
1381
1382                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1383                         drive->io_32bit = 1;
1384                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1385                         drive->dev_flags |= IDE_DFLAG_UNMASK;
1386                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1387                         drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1388
1389                 if (port_ops && port_ops->init_dev)
1390                         port_ops->init_dev(drive);
1391         }
1392 }
1393
1394 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1395                           const struct ide_port_info *d)
1396 {
1397         hwif->channel = port;
1398
1399         if (d->chipset)
1400                 hwif->chipset = d->chipset;
1401
1402         if (d->init_iops)
1403                 d->init_iops(hwif);
1404
1405         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1406             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1407                 hwif->irq = port ? 15 : 14;
1408
1409         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1410         hwif->host_flags |= d->host_flags;
1411         hwif->pio_mask = d->pio_mask;
1412
1413         if (d->tp_ops)
1414                 hwif->tp_ops = d->tp_ops;
1415
1416         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1417         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1418                 hwif->port_ops = d->port_ops;
1419
1420         hwif->swdma_mask = d->swdma_mask;
1421         hwif->mwdma_mask = d->mwdma_mask;
1422         hwif->ultra_mask = d->udma_mask;
1423
1424         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1425                 int rc;
1426
1427                 if (d->init_dma)
1428                         rc = d->init_dma(hwif, d);
1429                 else
1430                         rc = ide_hwif_setup_dma(hwif, d);
1431
1432                 if (rc < 0) {
1433                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1434                         hwif->dma_base = 0;
1435                         hwif->swdma_mask = 0;
1436                         hwif->mwdma_mask = 0;
1437                         hwif->ultra_mask = 0;
1438                 } else if (d->dma_ops)
1439                         hwif->dma_ops = d->dma_ops;
1440         }
1441
1442         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1443             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1444                 if (hwif->mate)
1445                         hwif->mate->serialized = hwif->serialized = 1;
1446         }
1447
1448         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1449                 hwif->rqsize = 256;
1450
1451         /* call chipset specific routine for each enabled port */
1452         if (d->init_hwif)
1453                 d->init_hwif(hwif);
1454 }
1455
1456 static void ide_port_cable_detect(ide_hwif_t *hwif)
1457 {
1458         const struct ide_port_ops *port_ops = hwif->port_ops;
1459
1460         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1461                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1462                         hwif->cbl = port_ops->cable_detect(hwif);
1463         }
1464 }
1465
1466 static ssize_t store_delete_devices(struct device *portdev,
1467                                     struct device_attribute *attr,
1468                                     const char *buf, size_t n)
1469 {
1470         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1471
1472         if (strncmp(buf, "1", n))
1473                 return -EINVAL;
1474
1475         ide_port_unregister_devices(hwif);
1476
1477         return n;
1478 };
1479
1480 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1481
1482 static ssize_t store_scan(struct device *portdev,
1483                           struct device_attribute *attr,
1484                           const char *buf, size_t n)
1485 {
1486         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1487
1488         if (strncmp(buf, "1", n))
1489                 return -EINVAL;
1490
1491         ide_port_unregister_devices(hwif);
1492         ide_port_scan(hwif);
1493
1494         return n;
1495 };
1496
1497 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1498
1499 static struct device_attribute *ide_port_attrs[] = {
1500         &dev_attr_delete_devices,
1501         &dev_attr_scan,
1502         NULL
1503 };
1504
1505 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1506 {
1507         int i, uninitialized_var(rc);
1508
1509         for (i = 0; ide_port_attrs[i]; i++) {
1510                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1511                 if (rc)
1512                         break;
1513         }
1514
1515         return rc;
1516 }
1517
1518 static unsigned int ide_indexes;
1519
1520 /**
1521  *      ide_find_port_slot      -       find free port slot
1522  *      @d: IDE port info
1523  *
1524  *      Return the new port slot index or -ENOENT if we are out of free slots.
1525  */
1526
1527 static int ide_find_port_slot(const struct ide_port_info *d)
1528 {
1529         int idx = -ENOENT;
1530         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1531         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1532
1533         /*
1534          * Claim an unassigned slot.
1535          *
1536          * Give preference to claiming other slots before claiming ide0/ide1,
1537          * just in case there's another interface yet-to-be-scanned
1538          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1539          *
1540          * Unless there is a bootable card that does not use the standard
1541          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1542          */
1543         mutex_lock(&ide_cfg_mtx);
1544         if (bootable) {
1545                 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1546                         idx = ffz(ide_indexes | i);
1547         } else {
1548                 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1549                         idx = ffz(ide_indexes | 3);
1550                 else if ((ide_indexes & 3) != 3)
1551                         idx = ffz(ide_indexes);
1552         }
1553         if (idx >= 0)
1554                 ide_indexes |= (1 << idx);
1555         mutex_unlock(&ide_cfg_mtx);
1556
1557         return idx;
1558 }
1559
1560 static void ide_free_port_slot(int idx)
1561 {
1562         mutex_lock(&ide_cfg_mtx);
1563         ide_indexes &= ~(1 << idx);
1564         mutex_unlock(&ide_cfg_mtx);
1565 }
1566
1567 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1568 {
1569         struct ide_host *host;
1570         int i;
1571
1572         host = kzalloc(sizeof(*host), GFP_KERNEL);
1573         if (host == NULL)
1574                 return NULL;
1575
1576         for (i = 0; i < MAX_HOST_PORTS; i++) {
1577                 ide_hwif_t *hwif;
1578                 int idx;
1579
1580                 if (hws[i] == NULL)
1581                         continue;
1582
1583                 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1584                 if (hwif == NULL)
1585                         continue;
1586
1587                 idx = ide_find_port_slot(d);
1588                 if (idx < 0) {
1589                         printk(KERN_ERR "%s: no free slot for interface\n",
1590                                         d ? d->name : "ide");
1591                         kfree(hwif);
1592                         continue;
1593                 }
1594
1595                 ide_init_port_data(hwif, idx);
1596
1597                 hwif->host = host;
1598
1599                 host->ports[i] = hwif;
1600                 host->n_ports++;
1601         }
1602
1603         if (host->n_ports == 0) {
1604                 kfree(host);
1605                 return NULL;
1606         }
1607
1608         if (hws[0])
1609                 host->dev[0] = hws[0]->dev;
1610
1611         if (d) {
1612                 host->init_chipset = d->init_chipset;
1613                 host->host_flags = d->host_flags;
1614         }
1615
1616         return host;
1617 }
1618 EXPORT_SYMBOL_GPL(ide_host_alloc);
1619
1620 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1621                       hw_regs_t **hws)
1622 {
1623         ide_hwif_t *hwif, *mate = NULL;
1624         int i, j = 0;
1625
1626         for (i = 0; i < MAX_HOST_PORTS; i++) {
1627                 hwif = host->ports[i];
1628
1629                 if (hwif == NULL) {
1630                         mate = NULL;
1631                         continue;
1632                 }
1633
1634                 ide_init_port_hw(hwif, hws[i]);
1635                 ide_port_apply_params(hwif);
1636
1637                 if (d == NULL) {
1638                         mate = NULL;
1639                 } else {
1640                         if ((i & 1) && mate) {
1641                                 hwif->mate = mate;
1642                                 mate->mate = hwif;
1643                         }
1644
1645                         mate = (i & 1) ? NULL : hwif;
1646
1647                         ide_init_port(hwif, i & 1, d);
1648                         ide_port_cable_detect(hwif);
1649                 }
1650
1651                 ide_port_init_devices(hwif);
1652         }
1653
1654         for (i = 0; i < MAX_HOST_PORTS; i++) {
1655                 hwif = host->ports[i];
1656
1657                 if (hwif == NULL)
1658                         continue;
1659
1660                 if (ide_probe_port(hwif) == 0)
1661                         hwif->present = 1;
1662
1663                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1664                     !hwif->mate->present)
1665                         ide_register_port(hwif);
1666
1667                 if (hwif->present)
1668                         ide_port_tune_devices(hwif);
1669         }
1670
1671         for (i = 0; i < MAX_HOST_PORTS; i++) {
1672                 hwif = host->ports[i];
1673
1674                 if (hwif == NULL)
1675                         continue;
1676
1677                 if (hwif_init(hwif) == 0) {
1678                         printk(KERN_INFO "%s: failed to initialize IDE "
1679                                          "interface\n", hwif->name);
1680                         hwif->present = 0;
1681                         continue;
1682                 }
1683
1684                 if (hwif->present)
1685                         if (ide_port_setup_devices(hwif) == 0) {
1686                                 hwif->present = 0;
1687                                 continue;
1688                         }
1689
1690                 j++;
1691
1692                 ide_acpi_init(hwif);
1693
1694                 if (hwif->present)
1695                         ide_acpi_port_init_devices(hwif);
1696         }
1697
1698         for (i = 0; i < MAX_HOST_PORTS; i++) {
1699                 hwif = host->ports[i];
1700
1701                 if (hwif == NULL)
1702                         continue;
1703
1704                 if (hwif->chipset == ide_unknown)
1705                         hwif->chipset = ide_generic;
1706
1707                 if (hwif->present)
1708                         hwif_register_devices(hwif);
1709         }
1710
1711         for (i = 0; i < MAX_HOST_PORTS; i++) {
1712                 hwif = host->ports[i];
1713
1714                 if (hwif == NULL)
1715                         continue;
1716
1717                 ide_sysfs_register_port(hwif);
1718                 ide_proc_register_port(hwif);
1719
1720                 if (hwif->present)
1721                         ide_proc_port_register_devices(hwif);
1722         }
1723
1724         return j ? 0 : -1;
1725 }
1726 EXPORT_SYMBOL_GPL(ide_host_register);
1727
1728 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1729                  struct ide_host **hostp)
1730 {
1731         struct ide_host *host;
1732         int rc;
1733
1734         host = ide_host_alloc(d, hws);
1735         if (host == NULL)
1736                 return -ENOMEM;
1737
1738         rc = ide_host_register(host, d, hws);
1739         if (rc) {
1740                 ide_host_free(host);
1741                 return rc;
1742         }
1743
1744         if (hostp)
1745                 *hostp = host;
1746
1747         return 0;
1748 }
1749 EXPORT_SYMBOL_GPL(ide_host_add);
1750
1751 void ide_host_free(struct ide_host *host)
1752 {
1753         ide_hwif_t *hwif;
1754         int i;
1755
1756         for (i = 0; i < MAX_HOST_PORTS; i++) {
1757                 hwif = host->ports[i];
1758
1759                 if (hwif == NULL)
1760                         continue;
1761
1762                 ide_free_port_slot(hwif->index);
1763                 kfree(hwif);
1764         }
1765
1766         kfree(host);
1767 }
1768 EXPORT_SYMBOL_GPL(ide_host_free);
1769
1770 void ide_host_remove(struct ide_host *host)
1771 {
1772         int i;
1773
1774         for (i = 0; i < MAX_HOST_PORTS; i++) {
1775                 if (host->ports[i])
1776                         ide_unregister(host->ports[i]);
1777         }
1778
1779         ide_host_free(host);
1780 }
1781 EXPORT_SYMBOL_GPL(ide_host_remove);
1782
1783 void ide_port_scan(ide_hwif_t *hwif)
1784 {
1785         ide_port_apply_params(hwif);
1786         ide_port_cable_detect(hwif);
1787         ide_port_init_devices(hwif);
1788
1789         if (ide_probe_port(hwif) < 0)
1790                 return;
1791
1792         hwif->present = 1;
1793
1794         ide_port_tune_devices(hwif);
1795         ide_acpi_port_init_devices(hwif);
1796         ide_port_setup_devices(hwif);
1797         hwif_register_devices(hwif);
1798         ide_proc_port_register_devices(hwif);
1799 }
1800 EXPORT_SYMBOL_GPL(ide_port_scan);
1801
1802 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1803                                 u8 port_no, const struct ide_port_info *d,
1804                                 unsigned long config)
1805 {
1806         unsigned long base, ctl;
1807         int irq;
1808
1809         if (port_no == 0) {
1810                 base = 0x1f0;
1811                 ctl  = 0x3f6;
1812                 irq  = 14;
1813         } else {
1814                 base = 0x170;
1815                 ctl  = 0x376;
1816                 irq  = 15;
1817         }
1818
1819         if (!request_region(base, 8, d->name)) {
1820                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1821                                 d->name, base, base + 7);
1822                 return;
1823         }
1824
1825         if (!request_region(ctl, 1, d->name)) {
1826                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1827                                 d->name, ctl);
1828                 release_region(base, 8);
1829                 return;
1830         }
1831
1832         ide_std_init_ports(hw, base, ctl);
1833         hw->irq = irq;
1834         hw->chipset = d->chipset;
1835         hw->config = config;
1836
1837         hws[port_no] = hw;
1838 }
1839
1840 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1841 {
1842         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1843
1844         memset(&hw, 0, sizeof(hw));
1845
1846         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1847                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1848         ide_legacy_init_one(hws, &hw[1], 1, d, config);
1849
1850         if (hws[0] == NULL && hws[1] == NULL &&
1851             (d->host_flags & IDE_HFLAG_SINGLE))
1852                 return -ENOENT;
1853
1854         return ide_host_add(d, hws, NULL);
1855 }
1856 EXPORT_SYMBOL_GPL(ide_legacy_device_add);