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 /**
 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                 a = tp_ops->read_altstatus(hwif);
 271                 s = tp_ops->read_status(hwif);
 272                 if ((a ^ s) & ~ATA_IDX)
 273                         /* ancient Seagate drives, broken interfaces */
 274                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 275                                          "instead of ALTSTATUS(0x%02x)\n",
 276                                          drive->name, s, a);
 277                 else
 278                         /* use non-intrusive polling */
 279                         use_altstatus = 1;
 280         }
 281
 282         /* set features register for atapi
 283          * identify command to be sure of reply
 284          */
 285         if (cmd == ATA_CMD_ID_ATAPI) {
 286                 ide_task_t task;
 287
 288                 memset(&task, 0, sizeof(task));
 289                 /* disable DMA & overlap */
 290                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 291
 292                 tp_ops->tf_load(drive, &task);
 293         }
 294
 295         /* ask drive for ID */
 296         tp_ops->exec_command(hwif, cmd);
 297
 298         timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 299
 300         if (ide_busy_sleep(hwif, timeout, use_altstatus))
 301                 return 1;
 302
 303         /* wait for IRQ and ATA_DRQ */
 304         msleep(50);
 305         s = tp_ops->read_status(hwif);
 306
 307         if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
 308                 unsigned long flags;
 309
 310                 /* local CPU only; some systems need this */
 311                 local_irq_save(flags);
 312                 /* drive returned ID */
 313                 do_identify(drive, cmd);
 314                 /* drive responded with ID */
 315                 rc = 0;
 316                 /* clear drive IRQ */
 317                 (void)tp_ops->read_status(hwif);
 318                 local_irq_restore(flags);
 319         } else {
 320                 /* drive refused ID */
 321                 rc = 2;
 322         }
 323         return rc;
 324 }
 325
 326 /**
 327  *      try_to_identify -       try to identify a drive
 328  *      @drive: drive to probe
 329  *      @cmd: command to use
 330  *
 331  *      Issue the identify command and then do IRQ probing to
 332  *      complete the identification when needed by finding the
 333  *      IRQ the drive is attached to
 334  */
 335
 336 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 337 {
 338         ide_hwif_t *hwif = HWIF(drive);
 339         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 340         int retval;
 341         int autoprobe = 0;
 342         unsigned long cookie = 0;
 343
 344         /*
 345          * Disable device irq unless we need to
 346          * probe for it. Otherwise we'll get spurious
 347          * interrupts during the identify-phase that
 348          * the irq handler isn't expecting.
 349          */
 350         if (hwif->io_ports.ctl_addr) {
 351                 if (!hwif->irq) {
 352                         autoprobe = 1;
 353                         cookie = probe_irq_on();
 354                 }
 355                 tp_ops->set_irq(hwif, autoprobe);
 356         }
 357
 358         retval = actual_try_to_identify(drive, cmd);
 359
 360         if (autoprobe) {
 361                 int irq;
 362
 363                 tp_ops->set_irq(hwif, 0);
 364                 /* clear drive IRQ */
 365                 (void)tp_ops->read_status(hwif);
 366                 udelay(5);
 367                 irq = probe_irq_off(cookie);
 368                 if (!hwif->irq) {
 369                         if (irq > 0) {
 370                                 hwif->irq = irq;
 371                         } else {
 372                                 /* Mmmm.. multiple IRQs..
 373                                  * don't know which was ours
 374                                  */
 375                                 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
 376                                         drive->name, cookie);
 377                         }
 378                 }
 379         }
 380         return retval;
 381 }
 382
 383 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
 384 {
 385         u8 stat;
 386
 387         timeout += jiffies;
 388
 389         do {
 390                 msleep(50);     /* give drive a breather */
 391                 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
 392                                  : hwif->tp_ops->read_status(hwif);
 393                 if ((stat & ATA_BUSY) == 0)
 394                         return 0;
 395         } while (time_before(jiffies, timeout));
 396
 397         return 1;       /* drive timed-out */
 398 }
 399
 400 static u8 ide_read_device(ide_drive_t *drive)
 401 {
 402         ide_task_t task;
 403
 404         memset(&task, 0, sizeof(task));
 405         task.tf_flags = IDE_TFLAG_IN_DEVICE;
 406
 407         drive->hwif->tp_ops->tf_read(drive, &task);
 408
 409         return task.tf.device;
 410 }
 411
 412 /**
 413  *      do_probe                -       probe an IDE device
 414  *      @drive: drive to probe
 415  *      @cmd: command to use
 416  *
 417  *      do_probe() has the difficult job of finding a drive if it exists,
 418  *      without getting hung up if it doesn't exist, without trampling on
 419  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 420  *
 421  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 422  *      but does not respond right away, the probe will "hang in there"
 423  *      for the maximum wait time (about 30 seconds), otherwise it will
 424  *      exit much more quickly.
 425  *
 426  * Returns:     0  device was identified
 427  *              1  device timed-out (no response to identify request)
 428  *              2  device aborted the command (refused to identify itself)
 429  *              3  bad status from device (possible for ATAPI drives)
 430  *              4  probe was not attempted because failure was obvious
 431  */
 432
 433 static int do_probe (ide_drive_t *drive, u8 cmd)
 434 {
 435         ide_hwif_t *hwif = HWIF(drive);
 436         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 437         int rc;
 438         u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
 439
 440         /* avoid waiting for inappropriate probes */
 441         if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
 442                 return 4;
 443
 444 #ifdef DEBUG
 445         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 446                 drive->name, present, drive->media,
 447                 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
 448 #endif
 449
 450         /* needed for some systems
 451          * (e.g. crw9624 as drive0 with disk as slave)
 452          */
 453         msleep(50);
 454         SELECT_DRIVE(drive);
 455         msleep(50);
 456
 457         if (ide_read_device(drive) != drive->select && present == 0) {
 458                 if (drive->dn & 1) {
 459                         /* exit with drive0 selected */
 460                         SELECT_DRIVE(&hwif->drives[0]);
 461                         /* allow ATA_BUSY to assert & clear */
 462                         msleep(50);
 463                 }
 464                 /* no i/f present: mmm.. this should be a 4 -ml */
 465                 return 3;
 466         }
 467
 468         stat = tp_ops->read_status(hwif);
 469
 470         if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
 471             present || cmd == ATA_CMD_ID_ATAPI) {
 472                 /* send cmd and wait */
 473                 if ((rc = try_to_identify(drive, cmd))) {
 474                         /* failed: try again */
 475                         rc = try_to_identify(drive,cmd);
 476                 }
 477
 478                 stat = tp_ops->read_status(hwif);
 479
 480                 if (stat == (ATA_BUSY | ATA_DRDY))
 481                         return 4;
 482
 483                 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
 484                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 485                                         "resetting drive\n", drive->name, stat);
 486                         msleep(50);
 487                         SELECT_DRIVE(drive);
 488                         msleep(50);
 489                         tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 490                         (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
 491                         rc = try_to_identify(drive, cmd);
 492                 }
 493
 494                 /* ensure drive IRQ is clear */
 495                 stat = tp_ops->read_status(hwif);
 496
 497                 if (rc == 1)
 498                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 499                                         drive->name, stat);
 500         } else {
 501                 /* not present or maybe ATAPI */
 502                 rc = 3;
 503         }
 504         if (drive->dn & 1) {
 505                 /* exit with drive0 selected */
 506                 SELECT_DRIVE(&hwif->drives[0]);
 507                 msleep(50);
 508                 /* ensure drive irq is clear */
 509                 (void)tp_ops->read_status(hwif);
 510         }
 511         return rc;
 512 }
 513
 514 /*
 515  *
 516  */
 517 static void enable_nest (ide_drive_t *drive)
 518 {
 519         ide_hwif_t *hwif = HWIF(drive);
 520         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 521         u8 stat;
 522
 523         printk(KERN_INFO "%s: enabling %s -- ",
 524                 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
 525
 526         SELECT_DRIVE(drive);
 527         msleep(50);
 528         tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
 529
 530         if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
 531                 printk(KERN_CONT "failed (timeout)\n");
 532                 return;
 533         }
 534
 535         msleep(50);
 536
 537         stat = tp_ops->read_status(hwif);
 538
 539         if (!OK_STAT(stat, 0, BAD_STAT))
 540                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 541         else
 542                 printk(KERN_CONT "success\n");
 543 }
 544
 545 /**
 546  *      probe_for_drives        -       upper level drive probe
 547  *      @drive: drive to probe for
 548  *
 549  *      probe_for_drive() tests for existence of a given drive using do_probe()
 550  *      and presents things to the user as needed.
 551  *
 552  *      Returns:        0  no device was found
 553  *                      1  device was found
 554  *                         (note: IDE_DFLAG_PRESENT might still be not set)
 555  */
 556
 557 static inline u8 probe_for_drive (ide_drive_t *drive)
 558 {
 559         char *m;
 560
 561         /*
 562          *      In order to keep things simple we have an id
 563          *      block for all drives at all times. If the device
 564          *      is pre ATA or refuses ATA/ATAPI identify we
 565          *      will add faked data to this.
 566          *
 567          *      Also note that 0 everywhere means "can't do X"
 568          */
 569
 570         drive->dev_flags &= ~IDE_DFLAG_ID_READ;
 571
 572         drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
 573         if (drive->id == NULL) {
 574                 printk(KERN_ERR "ide: out of memory for id data.\n");
 575                 return 0;
 576         }
 577
 578         m = (char *)&drive->id[ATA_ID_PROD];
 579         strcpy(m, "UNKNOWN");
 580
 581         /* skip probing? */
 582         if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
 583 retry:
 584                 /* if !(success||timed-out) */
 585                 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
 586                         /* look for ATAPI device */
 587                         (void)do_probe(drive, ATA_CMD_ID_ATAPI);
 588
 589                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 590                         /* drive not found */
 591                         return 0;
 592
 593                 if (strstr(m, "E X A B Y T E N E S T")) {
 594                         enable_nest(drive);
 595                         goto retry;
 596                 }
 597
 598                 /* identification failed? */
 599                 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 600                         if (drive->media == ide_disk) {
 601                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 602                                         drive->name, drive->cyl,
 603                                         drive->head, drive->sect);
 604                         } else if (drive->media == ide_cdrom) {
 605                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 606                         } else {
 607                                 /* nuke it */
 608                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 609                                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 610                         }
 611                 }
 612                 /* drive was found */
 613         }
 614
 615         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 616                 return 0;
 617
 618         /* The drive wasn't being helpful. Add generic info only */
 619         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 620                 generic_id(drive);
 621                 return 1;
 622         }
 623
 624         if (drive->media == ide_disk) {
 625                 ide_disk_init_chs(drive);
 626                 ide_disk_init_mult_count(drive);
 627         }
 628
 629         return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
 630 }
 631
 632 static void hwif_release_dev(struct device *dev)
 633 {
 634         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 635
 636         complete(&hwif->gendev_rel_comp);
 637 }
 638
 639 static int ide_register_port(ide_hwif_t *hwif)
 640 {
 641         int ret;
 642
 643         /* register with global device tree */
 644         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 645         hwif->gendev.driver_data = hwif;
 646         if (hwif->gendev.parent == NULL) {
 647                 if (hwif->dev)
 648                         hwif->gendev.parent = hwif->dev;
 649                 else
 650                         /* Would like to do = &device_legacy */
 651                         hwif->gendev.parent = NULL;
 652         }
 653         hwif->gendev.release = hwif_release_dev;
 654         ret = device_register(&hwif->gendev);
 655         if (ret < 0) {
 656                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 657                         __func__, ret);
 658                 goto out;
 659         }
 660
 661         hwif->portdev = device_create(ide_port_class, &hwif->gendev,
 662                                       MKDEV(0, 0), hwif, hwif->name);
 663         if (IS_ERR(hwif->portdev)) {
 664                 ret = PTR_ERR(hwif->portdev);
 665                 device_unregister(&hwif->gendev);
 666         }
 667 out:
 668         return ret;
 669 }
 670
 671 /**
 672  *      ide_port_wait_ready     -       wait for port to become ready
 673  *      @hwif: IDE port
 674  *
 675  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 676  *      platforms.  Typical cases are:
 677  *
 678  *      - The firmware hard reset the disk before booting the kernel,
 679  *        the drive is still doing it's poweron-reset sequence, that
 680  *        can take up to 30 seconds.
 681  *
 682  *      - The firmware does nothing (or no firmware), the device is
 683  *        still in POST state (same as above actually).
 684  *
 685  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 686  *        their reset sequence even when they are non-selected slave
 687  *        devices, thus preventing discovery of the main HD.
 688  *
 689  *      Doing this wait-for-non-busy should not harm any existing
 690  *      configuration and fix some issues like the above.
 691  *
 692  *      BenH.
 693  *
 694  *      Returns 0 on success, error code (< 0) otherwise.
 695  */
 696
 697 static int ide_port_wait_ready(ide_hwif_t *hwif)
 698 {
 699         int unit, rc;
 700
 701         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 702
 703         /* Let HW settle down a bit from whatever init state we
 704          * come from */
 705         mdelay(2);
 706
 707         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 708          * I know of at least one disk who takes 31 seconds, I use 35
 709          * here to be safe
 710          */
 711         rc = ide_wait_not_busy(hwif, 35000);
 712         if (rc)
 713                 return rc;
 714
 715         /* Now make sure both master & slave are ready */
 716         for (unit = 0; unit < MAX_DRIVES; unit++) {
 717                 ide_drive_t *drive = &hwif->drives[unit];
 718
 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 (unit)
 735                 SELECT_DRIVE(&hwif->drives[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->drives[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         unsigned long flags;
 781         unsigned int irqd;
 782         int unit, rc = -ENODEV;
 783
 784         BUG_ON(hwif->present);
 785
 786         if ((hwif->drives[0].dev_flags & IDE_DFLAG_NOPROBE) &&
 787             (hwif->drives[1].dev_flags & IDE_DFLAG_NOPROBE))
 788                 return -EACCES;
 789
 790         /*
 791          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 792          * we'll install our IRQ driver much later...
 793          */
 794         irqd = hwif->irq;
 795         if (irqd)
 796                 disable_irq(hwif->irq);
 797
 798         local_irq_set(flags);
 799
 800         if (ide_port_wait_ready(hwif) == -EBUSY)
 801                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 802
 803         /*
 804          * Second drive should only exist if first drive was found,
 805          * but a lot of cdrom drives are configured as single slaves.
 806          */
 807         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 808                 ide_drive_t *drive = &hwif->drives[unit];
 809
 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         int unit;
 831
 832         for (unit = 0; unit < MAX_DRIVES; unit++) {
 833                 ide_drive_t *drive = &hwif->drives[unit];
 834
 835                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 836                         if (port_ops && port_ops->quirkproc)
 837                                 port_ops->quirkproc(drive);
 838                 }
 839         }
 840
 841         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 842                 ide_drive_t *drive = &hwif->drives[unit];
 843
 844                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 845                         ide_set_max_pio(drive);
 846
 847                         drive->dev_flags |= IDE_DFLAG_NICE1;
 848
 849                         if (hwif->dma_ops)
 850                                 ide_set_dma(drive);
 851                 }
 852         }
 853
 854         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 855                 ide_drive_t *drive = &hwif->drives[unit];
 856
 857                 if ((hwif->host_flags & IDE_HFLAG_NO_IO_32BIT) ||
 858                     drive->id[ATA_ID_DWORD_IO])
 859                         drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
 860                 else
 861                         drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
 862         }
 863 }
 864
 865 /*
 866  * save_match() is used to simplify logic in init_irq() below.
 867  *
 868  * A loophole here is that we may not know about a particular
 869  * hwif's irq until after that hwif is actually probed/initialized..
 870  * This could be a problem for the case where an hwif is on a
 871  * dual interface that requires serialization (eg. cmd640) and another
 872  * hwif using one of the same irqs is initialized beforehand.
 873  *
 874  * This routine detects and reports such situations, but does not fix them.
 875  */
 876 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 877 {
 878         ide_hwif_t *m = *match;
 879
 880         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 881                 if (!new->hwgroup)
 882                         return;
 883                 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
 884                         hwif->name, new->name, m->name);
 885         }
 886         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 887                 *match = new;
 888 }
 889
 890 /*
 891  * init request queue
 892  */
 893 static int ide_init_queue(ide_drive_t *drive)
 894 {
 895         struct request_queue *q;
 896         ide_hwif_t *hwif = HWIF(drive);
 897         int max_sectors = 256;
 898         int max_sg_entries = PRD_ENTRIES;
 899
 900         /*
 901          *      Our default set up assumes the normal IDE case,
 902          *      that is 64K segmenting, standard PRD setup
 903          *      and LBA28. Some drivers then impose their own
 904          *      limits and LBA48 we could raise it but as yet
 905          *      do not.
 906          */
 907
 908         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 909         if (!q)
 910                 return 1;
 911
 912         q->queuedata = drive;
 913         blk_queue_segment_boundary(q, 0xffff);
 914
 915         if (hwif->rqsize < max_sectors)
 916                 max_sectors = hwif->rqsize;
 917         blk_queue_max_sectors(q, max_sectors);
 918
 919 #ifdef CONFIG_PCI
 920         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 921          * creates segments that don't completely match our boundary
 922          * requirements and thus need to be broken up again. Because it
 923          * doesn't align properly either, we may actually have to break up
 924          * to more segments than what was we got in the first place, a max
 925          * worst case is twice as many.
 926          * This will be fixed once we teach pci_map_sg() about our boundary
 927          * requirements, hopefully soon. *FIXME*
 928          */
 929         if (!PCI_DMA_BUS_IS_PHYS)
 930                 max_sg_entries >>= 1;
 931 #endif /* CONFIG_PCI */
 932
 933         blk_queue_max_hw_segments(q, max_sg_entries);
 934         blk_queue_max_phys_segments(q, max_sg_entries);
 935
 936         /* assign drive queue */
 937         drive->queue = q;
 938
 939         /* needs drive->queue to be set */
 940         ide_toggle_bounce(drive, 1);
 941
 942         return 0;
 943 }
 944
 945 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 946 {
 947         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 948
 949         spin_lock_irq(&ide_lock);
 950         if (!hwgroup->drive) {
 951                 /* first drive for hwgroup. */
 952                 drive->next = drive;
 953                 hwgroup->drive = drive;
 954                 hwgroup->hwif = HWIF(hwgroup->drive);
 955         } else {
 956                 drive->next = hwgroup->drive->next;
 957                 hwgroup->drive->next = drive;
 958         }
 959         spin_unlock_irq(&ide_lock);
 960 }
 961
 962 /*
 963  * For any present drive:
 964  * - allocate the block device queue
 965  * - link drive into the hwgroup
 966  */
 967 static int ide_port_setup_devices(ide_hwif_t *hwif)
 968 {
 969         int i, j = 0;
 970
 971         mutex_lock(&ide_cfg_mtx);
 972         for (i = 0; i < MAX_DRIVES; i++) {
 973                 ide_drive_t *drive = &hwif->drives[i];
 974
 975                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 976                         continue;
 977
 978                 if (ide_init_queue(drive)) {
 979                         printk(KERN_ERR "ide: failed to init %s\n",
 980                                         drive->name);
 981                         kfree(drive->id);
 982                         drive->id = NULL;
 983                         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 984                         continue;
 985                 }
 986
 987                 j++;
 988
 989                 ide_add_drive_to_hwgroup(drive);
 990         }
 991         mutex_unlock(&ide_cfg_mtx);
 992
 993         return j;
 994 }
 995
 996 static ide_hwif_t *ide_ports[MAX_HWIFS];
 997
 998 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 999 {
1000         ide_hwgroup_t *hwgroup = hwif->hwgroup;
1001
1002         ide_ports[hwif->index] = NULL;
1003
1004         spin_lock_irq(&ide_lock);
1005         /*
1006          * Remove us from the hwgroup, and free
1007          * the hwgroup if we were the only member
1008          */
1009         if (hwif->next == hwif) {
1010                 BUG_ON(hwgroup->hwif != hwif);
1011                 kfree(hwgroup);
1012         } else {
1013                 /* There is another interface in hwgroup.
1014                  * Unlink us, and set hwgroup->drive and ->hwif to
1015                  * something sane.
1016                  */
1017                 ide_hwif_t *g = hwgroup->hwif;
1018
1019                 while (g->next != hwif)
1020                         g = g->next;
1021                 g->next = hwif->next;
1022                 if (hwgroup->hwif == hwif) {
1023                         /* Chose a random hwif for hwgroup->hwif.
1024                          * It's guaranteed that there are no drives
1025                          * left in the hwgroup.
1026                          */
1027                         BUG_ON(hwgroup->drive != NULL);
1028                         hwgroup->hwif = g;
1029                 }
1030                 BUG_ON(hwgroup->hwif == hwif);
1031         }
1032         spin_unlock_irq(&ide_lock);
1033 }
1034
1035 /*
1036  * This routine sets up the irq for an ide interface, and creates a new
1037  * hwgroup for the irq/hwif if none was previously assigned.
1038  *
1039  * Much of the code is for correctly detecting/handling irq sharing
1040  * and irq serialization situations.  This is somewhat complex because
1041  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1042  */
1043 static int init_irq (ide_hwif_t *hwif)
1044 {
1045         struct ide_io_ports *io_ports = &hwif->io_ports;
1046         unsigned int index;
1047         ide_hwgroup_t *hwgroup;
1048         ide_hwif_t *match = NULL;
1049
1050         mutex_lock(&ide_cfg_mtx);
1051         hwif->hwgroup = NULL;
1052
1053         /*
1054          * Group up with any other hwifs that share our irq(s).
1055          */
1056         for (index = 0; index < MAX_HWIFS; index++) {
1057                 ide_hwif_t *h = ide_ports[index];
1058
1059                 if (h && h->hwgroup) {  /* scan only initialized ports */
1060                         if (hwif->irq == h->irq) {
1061                                 hwif->sharing_irq = h->sharing_irq = 1;
1062                                 if (hwif->chipset != ide_pci ||
1063                                     h->chipset != ide_pci) {
1064                                         save_match(hwif, h, &match);
1065                                 }
1066                         }
1067                         if (hwif->serialized) {
1068                                 if (hwif->mate && hwif->mate->irq == h->irq)
1069                                         save_match(hwif, h, &match);
1070                         }
1071                         if (h->serialized) {
1072                                 if (h->mate && hwif->irq == h->mate->irq)
1073                                         save_match(hwif, h, &match);
1074                         }
1075                 }
1076         }
1077
1078         /*
1079          * If we are still without a hwgroup, then form a new one
1080          */
1081         if (match) {
1082                 hwgroup = match->hwgroup;
1083                 hwif->hwgroup = hwgroup;
1084                 /*
1085                  * Link us into the hwgroup.
1086                  * This must be done early, do ensure that unexpected_intr
1087                  * can find the hwif and prevent irq storms.
1088                  * No drives are attached to the new hwif, choose_drive
1089                  * can't do anything stupid (yet).
1090                  * Add ourself as the 2nd entry to the hwgroup->hwif
1091                  * linked list, the first entry is the hwif that owns
1092                  * hwgroup->handler - do not change that.
1093                  */
1094                 spin_lock_irq(&ide_lock);
1095                 hwif->next = hwgroup->hwif->next;
1096                 hwgroup->hwif->next = hwif;
1097                 BUG_ON(hwif->next == hwif);
1098                 spin_unlock_irq(&ide_lock);
1099         } else {
1100                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1101                                        hwif_to_node(hwif));
1102                 if (hwgroup == NULL)
1103                         goto out_up;
1104
1105                 hwif->hwgroup = hwgroup;
1106                 hwgroup->hwif = hwif->next = hwif;
1107
1108                 init_timer(&hwgroup->timer);
1109                 hwgroup->timer.function = &ide_timer_expiry;
1110                 hwgroup->timer.data = (unsigned long) hwgroup;
1111         }
1112
1113         ide_ports[hwif->index] = hwif;
1114
1115         /*
1116          * Allocate the irq, if not already obtained for another hwif
1117          */
1118         if (!match || match->irq != hwif->irq) {
1119                 int sa = 0;
1120 #if defined(__mc68000__)
1121                 sa = IRQF_SHARED;
1122 #endif /* __mc68000__ */
1123
1124                 if (hwif->chipset == ide_pci || hwif->chipset == ide_cmd646 ||
1125                     hwif->chipset == ide_ali14xx)
1126                         sa = IRQF_SHARED;
1127
1128                 if (io_ports->ctl_addr)
1129                         hwif->tp_ops->set_irq(hwif, 1);
1130
1131                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1132                         goto out_unlink;
1133         }
1134
1135         if (!hwif->rqsize) {
1136                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1137                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1138                         hwif->rqsize = 256;
1139                 else
1140                         hwif->rqsize = 65536;
1141         }
1142
1143 #if !defined(__mc68000__)
1144         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1145                 io_ports->data_addr, io_ports->status_addr,
1146                 io_ports->ctl_addr, hwif->irq);
1147 #else
1148         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1149                 io_ports->data_addr, hwif->irq);
1150 #endif /* __mc68000__ */
1151         if (match)
1152                 printk(KERN_CONT " (%sed with %s)",
1153                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1154         printk(KERN_CONT "\n");
1155
1156         mutex_unlock(&ide_cfg_mtx);
1157         return 0;
1158 out_unlink:
1159         ide_remove_port_from_hwgroup(hwif);
1160 out_up:
1161         mutex_unlock(&ide_cfg_mtx);
1162         return 1;
1163 }
1164
1165 static int ata_lock(dev_t dev, void *data)
1166 {
1167         /* FIXME: we want to pin hwif down */
1168         return 0;
1169 }
1170
1171 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1172 {
1173         ide_hwif_t *hwif = data;
1174         int unit = *part >> PARTN_BITS;
1175         ide_drive_t *drive = &hwif->drives[unit];
1176
1177         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1178                 return NULL;
1179
1180         if (drive->media == ide_disk)
1181                 request_module("ide-disk");
1182         if (drive->dev_flags & IDE_DFLAG_SCSI)
1183                 request_module("ide-scsi");
1184         if (drive->media == ide_cdrom || drive->media == ide_optical)
1185                 request_module("ide-cd");
1186         if (drive->media == ide_tape)
1187                 request_module("ide-tape");
1188         if (drive->media == ide_floppy)
1189                 request_module("ide-floppy");
1190
1191         return NULL;
1192 }
1193
1194 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1195 {
1196         struct gendisk *p = data;
1197         *part &= (1 << PARTN_BITS) - 1;
1198         return &disk_to_dev(p)->kobj;
1199 }
1200
1201 static int exact_lock(dev_t dev, void *data)
1202 {
1203         struct gendisk *p = data;
1204
1205         if (!get_disk(p))
1206                 return -1;
1207         return 0;
1208 }
1209
1210 void ide_register_region(struct gendisk *disk)
1211 {
1212         blk_register_region(MKDEV(disk->major, disk->first_minor),
1213                             disk->minors, NULL, exact_match, exact_lock, disk);
1214 }
1215
1216 EXPORT_SYMBOL_GPL(ide_register_region);
1217
1218 void ide_unregister_region(struct gendisk *disk)
1219 {
1220         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1221                               disk->minors);
1222 }
1223
1224 EXPORT_SYMBOL_GPL(ide_unregister_region);
1225
1226 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1227 {
1228         ide_hwif_t *hwif = drive->hwif;
1229         unsigned int unit = drive->dn & 1;
1230
1231         disk->major = hwif->major;
1232         disk->first_minor = unit << PARTN_BITS;
1233         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1234         disk->queue = drive->queue;
1235 }
1236
1237 EXPORT_SYMBOL_GPL(ide_init_disk);
1238
1239 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1240 {
1241         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1242
1243         if (drive == drive->next) {
1244                 /* special case: last drive from hwgroup. */
1245                 BUG_ON(hwgroup->drive != drive);
1246                 hwgroup->drive = NULL;
1247         } else {
1248                 ide_drive_t *walk;
1249
1250                 walk = hwgroup->drive;
1251                 while (walk->next != drive)
1252                         walk = walk->next;
1253                 walk->next = drive->next;
1254                 if (hwgroup->drive == drive) {
1255                         hwgroup->drive = drive->next;
1256                         hwgroup->hwif = hwgroup->drive->hwif;
1257                 }
1258         }
1259         BUG_ON(hwgroup->drive == drive);
1260 }
1261
1262 static void drive_release_dev (struct device *dev)
1263 {
1264         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1265
1266         ide_proc_unregister_device(drive);
1267
1268         spin_lock_irq(&ide_lock);
1269         ide_remove_drive_from_hwgroup(drive);
1270         kfree(drive->id);
1271         drive->id = NULL;
1272         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1273         /* Messed up locking ... */
1274         spin_unlock_irq(&ide_lock);
1275         blk_cleanup_queue(drive->queue);
1276         spin_lock_irq(&ide_lock);
1277         drive->queue = NULL;
1278         spin_unlock_irq(&ide_lock);
1279
1280         complete(&drive->gendev_rel_comp);
1281 }
1282
1283 static int hwif_init(ide_hwif_t *hwif)
1284 {
1285         int old_irq;
1286
1287         if (!hwif->irq) {
1288                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1289                 if (!hwif->irq) {
1290                         printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1291                         return 0;
1292                 }
1293         }
1294
1295         if (register_blkdev(hwif->major, hwif->name))
1296                 return 0;
1297
1298         if (!hwif->sg_max_nents)
1299                 hwif->sg_max_nents = PRD_ENTRIES;
1300
1301         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1302                                  GFP_KERNEL);
1303         if (!hwif->sg_table) {
1304                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1305                 goto out;
1306         }
1307
1308         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1309
1310         if (init_irq(hwif) == 0)
1311                 goto done;
1312
1313         old_irq = hwif->irq;
1314         /*
1315          *      It failed to initialise. Find the default IRQ for
1316          *      this port and try that.
1317          */
1318         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1319         if (!hwif->irq) {
1320                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1321                         hwif->name, old_irq);
1322                 goto out;
1323         }
1324         if (init_irq(hwif)) {
1325                 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1326                         hwif->name, old_irq, hwif->irq);
1327                 goto out;
1328         }
1329         printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1330                 hwif->name, hwif->irq);
1331
1332 done:
1333         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1334                             THIS_MODULE, ata_probe, ata_lock, hwif);
1335         return 1;
1336
1337 out:
1338         unregister_blkdev(hwif->major, hwif->name);
1339         return 0;
1340 }
1341
1342 static void hwif_register_devices(ide_hwif_t *hwif)
1343 {
1344         unsigned int i;
1345
1346         for (i = 0; i < MAX_DRIVES; i++) {
1347                 ide_drive_t *drive = &hwif->drives[i];
1348                 struct device *dev = &drive->gendev;
1349                 int ret;
1350
1351                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1352                         continue;
1353
1354                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1355                 dev->parent = &hwif->gendev;
1356                 dev->bus = &ide_bus_type;
1357                 dev->driver_data = drive;
1358                 dev->release = drive_release_dev;
1359
1360                 ret = device_register(dev);
1361                 if (ret < 0)
1362                         printk(KERN_WARNING "IDE: %s: device_register error: "
1363                                             "%d\n", __func__, ret);
1364         }
1365 }
1366
1367 static void ide_port_init_devices(ide_hwif_t *hwif)
1368 {
1369         const struct ide_port_ops *port_ops = hwif->port_ops;
1370         int i;
1371
1372         for (i = 0; i < MAX_DRIVES; i++) {
1373                 ide_drive_t *drive = &hwif->drives[i];
1374
1375                 drive->dn = i + hwif->channel * 2;
1376
1377                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1378                         drive->io_32bit = 1;
1379                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1380                         drive->dev_flags |= IDE_DFLAG_UNMASK;
1381                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1382                         drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1383
1384                 if (port_ops && port_ops->init_dev)
1385                         port_ops->init_dev(drive);
1386         }
1387 }
1388
1389 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1390                           const struct ide_port_info *d)
1391 {
1392         hwif->channel = port;
1393
1394         if (d->chipset)
1395                 hwif->chipset = d->chipset;
1396
1397         if (d->init_iops)
1398                 d->init_iops(hwif);
1399
1400         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1401             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1402                 hwif->irq = port ? 15 : 14;
1403
1404         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1405         hwif->host_flags |= d->host_flags;
1406         hwif->pio_mask = d->pio_mask;
1407
1408         if (d->tp_ops)
1409                 hwif->tp_ops = d->tp_ops;
1410
1411         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1412         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1413                 hwif->port_ops = d->port_ops;
1414
1415         hwif->swdma_mask = d->swdma_mask;
1416         hwif->mwdma_mask = d->mwdma_mask;
1417         hwif->ultra_mask = d->udma_mask;
1418
1419         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1420                 int rc;
1421
1422                 if (d->init_dma)
1423                         rc = d->init_dma(hwif, d);
1424                 else
1425                         rc = ide_hwif_setup_dma(hwif, d);
1426
1427                 if (rc < 0) {
1428                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1429                         hwif->dma_base = 0;
1430                         hwif->swdma_mask = 0;
1431                         hwif->mwdma_mask = 0;
1432                         hwif->ultra_mask = 0;
1433                 } else if (d->dma_ops)
1434                         hwif->dma_ops = d->dma_ops;
1435         }
1436
1437         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1438             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1439                 if (hwif->mate)
1440                         hwif->mate->serialized = hwif->serialized = 1;
1441         }
1442
1443         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1444                 hwif->rqsize = 256;
1445
1446         /* call chipset specific routine for each enabled port */
1447         if (d->init_hwif)
1448                 d->init_hwif(hwif);
1449 }
1450
1451 static void ide_port_cable_detect(ide_hwif_t *hwif)
1452 {
1453         const struct ide_port_ops *port_ops = hwif->port_ops;
1454
1455         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1456                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1457                         hwif->cbl = port_ops->cable_detect(hwif);
1458         }
1459 }
1460
1461 static ssize_t store_delete_devices(struct device *portdev,
1462                                     struct device_attribute *attr,
1463                                     const char *buf, size_t n)
1464 {
1465         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1466
1467         if (strncmp(buf, "1", n))
1468                 return -EINVAL;
1469
1470         ide_port_unregister_devices(hwif);
1471
1472         return n;
1473 };
1474
1475 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1476
1477 static ssize_t store_scan(struct device *portdev,
1478                           struct device_attribute *attr,
1479                           const char *buf, size_t n)
1480 {
1481         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1482
1483         if (strncmp(buf, "1", n))
1484                 return -EINVAL;
1485
1486         ide_port_unregister_devices(hwif);
1487         ide_port_scan(hwif);
1488
1489         return n;
1490 };
1491
1492 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1493
1494 static struct device_attribute *ide_port_attrs[] = {
1495         &dev_attr_delete_devices,
1496         &dev_attr_scan,
1497         NULL
1498 };
1499
1500 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1501 {
1502         int i, uninitialized_var(rc);
1503
1504         for (i = 0; ide_port_attrs[i]; i++) {
1505                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1506                 if (rc)
1507                         break;
1508         }
1509
1510         return rc;
1511 }
1512
1513 static unsigned int ide_indexes;
1514
1515 /**
1516  *      ide_find_port_slot      -       find free port slot
1517  *      @d: IDE port info
1518  *
1519  *      Return the new port slot index or -ENOENT if we are out of free slots.
1520  */
1521
1522 static int ide_find_port_slot(const struct ide_port_info *d)
1523 {
1524         int idx = -ENOENT;
1525         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1526         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1527
1528         /*
1529          * Claim an unassigned slot.
1530          *
1531          * Give preference to claiming other slots before claiming ide0/ide1,
1532          * just in case there's another interface yet-to-be-scanned
1533          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1534          *
1535          * Unless there is a bootable card that does not use the standard
1536          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1537          */
1538         mutex_lock(&ide_cfg_mtx);
1539         if (bootable) {
1540                 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1541                         idx = ffz(ide_indexes | i);
1542         } else {
1543                 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1544                         idx = ffz(ide_indexes | 3);
1545                 else if ((ide_indexes & 3) != 3)
1546                         idx = ffz(ide_indexes);
1547         }
1548         if (idx >= 0)
1549                 ide_indexes |= (1 << idx);
1550         mutex_unlock(&ide_cfg_mtx);
1551
1552         return idx;
1553 }
1554
1555 static void ide_free_port_slot(int idx)
1556 {
1557         mutex_lock(&ide_cfg_mtx);
1558         ide_indexes &= ~(1 << idx);
1559         mutex_unlock(&ide_cfg_mtx);
1560 }
1561
1562 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1563 {
1564         struct ide_host *host;
1565         int i;
1566
1567         host = kzalloc(sizeof(*host), GFP_KERNEL);
1568         if (host == NULL)
1569                 return NULL;
1570
1571         for (i = 0; i < MAX_HOST_PORTS; i++) {
1572                 ide_hwif_t *hwif;
1573                 int idx;
1574
1575                 if (hws[i] == NULL)
1576                         continue;
1577
1578                 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1579                 if (hwif == NULL)
1580                         continue;
1581
1582                 idx = ide_find_port_slot(d);
1583                 if (idx < 0) {
1584                         printk(KERN_ERR "%s: no free slot for interface\n",
1585                                         d ? d->name : "ide");
1586                         kfree(hwif);
1587                         continue;
1588                 }
1589
1590                 ide_init_port_data(hwif, idx);
1591
1592                 hwif->host = host;
1593
1594                 host->ports[i] = hwif;
1595                 host->n_ports++;
1596         }
1597
1598         if (host->n_ports == 0) {
1599                 kfree(host);
1600                 return NULL;
1601         }
1602
1603         if (hws[0])
1604                 host->dev[0] = hws[0]->dev;
1605
1606         if (d) {
1607                 host->init_chipset = d->init_chipset;
1608                 host->host_flags = d->host_flags;
1609         }
1610
1611         return host;
1612 }
1613 EXPORT_SYMBOL_GPL(ide_host_alloc);
1614
1615 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1616                       hw_regs_t **hws)
1617 {
1618         ide_hwif_t *hwif, *mate = NULL;
1619         int i, j = 0;
1620
1621         for (i = 0; i < MAX_HOST_PORTS; i++) {
1622                 hwif = host->ports[i];
1623
1624                 if (hwif == NULL) {
1625                         mate = NULL;
1626                         continue;
1627                 }
1628
1629                 ide_init_port_hw(hwif, hws[i]);
1630                 ide_port_apply_params(hwif);
1631
1632                 if (d == NULL) {
1633                         mate = NULL;
1634                 } else {
1635                         if ((i & 1) && mate) {
1636                                 hwif->mate = mate;
1637                                 mate->mate = hwif;
1638                         }
1639
1640                         mate = (i & 1) ? NULL : hwif;
1641
1642                         ide_init_port(hwif, i & 1, d);
1643                         ide_port_cable_detect(hwif);
1644                 }
1645
1646                 ide_port_init_devices(hwif);
1647         }
1648
1649         for (i = 0; i < MAX_HOST_PORTS; i++) {
1650                 hwif = host->ports[i];
1651
1652                 if (hwif == NULL)
1653                         continue;
1654
1655                 if (ide_probe_port(hwif) == 0)
1656                         hwif->present = 1;
1657
1658                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1659                     !hwif->mate->present)
1660                         ide_register_port(hwif);
1661
1662                 if (hwif->present)
1663                         ide_port_tune_devices(hwif);
1664         }
1665
1666         for (i = 0; i < MAX_HOST_PORTS; i++) {
1667                 hwif = host->ports[i];
1668
1669                 if (hwif == NULL)
1670                         continue;
1671
1672                 if (hwif_init(hwif) == 0) {
1673                         printk(KERN_INFO "%s: failed to initialize IDE "
1674                                          "interface\n", hwif->name);
1675                         hwif->present = 0;
1676                         continue;
1677                 }
1678
1679                 if (hwif->present)
1680                         if (ide_port_setup_devices(hwif) == 0) {
1681                                 hwif->present = 0;
1682                                 continue;
1683                         }
1684
1685                 j++;
1686
1687                 ide_acpi_init(hwif);
1688
1689                 if (hwif->present)
1690                         ide_acpi_port_init_devices(hwif);
1691         }
1692
1693         for (i = 0; i < MAX_HOST_PORTS; i++) {
1694                 hwif = host->ports[i];
1695
1696                 if (hwif == NULL)
1697                         continue;
1698
1699                 if (hwif->chipset == ide_unknown)
1700                         hwif->chipset = ide_generic;
1701
1702                 if (hwif->present)
1703                         hwif_register_devices(hwif);
1704         }
1705
1706         for (i = 0; i < MAX_HOST_PORTS; i++) {
1707                 hwif = host->ports[i];
1708
1709                 if (hwif == NULL)
1710                         continue;
1711
1712                 ide_sysfs_register_port(hwif);
1713                 ide_proc_register_port(hwif);
1714
1715                 if (hwif->present)
1716                         ide_proc_port_register_devices(hwif);
1717         }
1718
1719         return j ? 0 : -1;
1720 }
1721 EXPORT_SYMBOL_GPL(ide_host_register);
1722
1723 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1724                  struct ide_host **hostp)
1725 {
1726         struct ide_host *host;
1727         int rc;
1728
1729         host = ide_host_alloc(d, hws);
1730         if (host == NULL)
1731                 return -ENOMEM;
1732
1733         rc = ide_host_register(host, d, hws);
1734         if (rc) {
1735                 ide_host_free(host);
1736                 return rc;
1737         }
1738
1739         if (hostp)
1740                 *hostp = host;
1741
1742         return 0;
1743 }
1744 EXPORT_SYMBOL_GPL(ide_host_add);
1745
1746 void ide_host_free(struct ide_host *host)
1747 {
1748         ide_hwif_t *hwif;
1749         int i;
1750
1751         for (i = 0; i < MAX_HOST_PORTS; i++) {
1752                 hwif = host->ports[i];
1753
1754                 if (hwif == NULL)
1755                         continue;
1756
1757                 ide_free_port_slot(hwif->index);
1758                 kfree(hwif);
1759         }
1760
1761         kfree(host);
1762 }
1763 EXPORT_SYMBOL_GPL(ide_host_free);
1764
1765 void ide_host_remove(struct ide_host *host)
1766 {
1767         int i;
1768
1769         for (i = 0; i < MAX_HOST_PORTS; i++) {
1770                 if (host->ports[i])
1771                         ide_unregister(host->ports[i]);
1772         }
1773
1774         ide_host_free(host);
1775 }
1776 EXPORT_SYMBOL_GPL(ide_host_remove);
1777
1778 void ide_port_scan(ide_hwif_t *hwif)
1779 {
1780         ide_port_apply_params(hwif);
1781         ide_port_cable_detect(hwif);
1782         ide_port_init_devices(hwif);
1783
1784         if (ide_probe_port(hwif) < 0)
1785                 return;
1786
1787         hwif->present = 1;
1788
1789         ide_port_tune_devices(hwif);
1790         ide_acpi_port_init_devices(hwif);
1791         ide_port_setup_devices(hwif);
1792         hwif_register_devices(hwif);
1793         ide_proc_port_register_devices(hwif);
1794 }
1795 EXPORT_SYMBOL_GPL(ide_port_scan);
1796
1797 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1798                                 u8 port_no, const struct ide_port_info *d,
1799                                 unsigned long config)
1800 {
1801         unsigned long base, ctl;
1802         int irq;
1803
1804         if (port_no == 0) {
1805                 base = 0x1f0;
1806                 ctl  = 0x3f6;
1807                 irq  = 14;
1808         } else {
1809                 base = 0x170;
1810                 ctl  = 0x376;
1811                 irq  = 15;
1812         }
1813
1814         if (!request_region(base, 8, d->name)) {
1815                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1816                                 d->name, base, base + 7);
1817                 return;
1818         }
1819
1820         if (!request_region(ctl, 1, d->name)) {
1821                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1822                                 d->name, ctl);
1823                 release_region(base, 8);
1824                 return;
1825         }
1826
1827         ide_std_init_ports(hw, base, ctl);
1828         hw->irq = irq;
1829         hw->chipset = d->chipset;
1830         hw->config = config;
1831
1832         hws[port_no] = hw;
1833 }
1834
1835 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1836 {
1837         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1838
1839         memset(&hw, 0, sizeof(hw));
1840
1841         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1842                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1843         ide_legacy_init_one(hws, &hw[1], 1, d, config);
1844
1845         if (hws[0] == NULL && hws[1] == NULL &&
1846             (d->host_flags & IDE_HFLAG_SINGLE))
1847                 return -ENOENT;
1848
1849         return ide_host_add(d, hws, NULL);
1850 }
1851 EXPORT_SYMBOL_GPL(ide_legacy_device_add);