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                 /* we don't do head unloading on ATAPI devices */
 212                 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
 213                 return;
 214         }
 215
 216         /*
 217          * Not an ATAPI device: looks like a "regular" hard disk
 218          */
 219
 220         is_cfa = ata_id_is_cfa(id);
 221
 222         /* CF devices are *not* removable in Linux definition of the term */
 223         if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
 224                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 225
 226         drive->media = ide_disk;
 227
 228         if (!ata_id_has_unload(drive->id))
 229                 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
 230
 231         printk(KERN_CONT "%s DISK drive\n", is_cfa ? "CFA" : "ATA");
 232
 233         return;
 234
 235 err_misc:
 236         kfree(id);
 237         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 238         return;
 239 }
 240
 241 /**
 242  *      actual_try_to_identify  -       send ata/atapi identify
 243  *      @drive: drive to identify
 244  *      @cmd: command to use
 245  *
 246  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 247  *      and waits for a response.  It also monitors irqs while this is
 248  *      happening, in hope of automatically determining which one is
 249  *      being used by the interface.
 250  *
 251  *      Returns:        0  device was identified
 252  *                      1  device timed-out (no response to identify request)
 253  *                      2  device aborted the command (refused to identify itself)
 254  */
 255
 256 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 257 {
 258         ide_hwif_t *hwif = HWIF(drive);
 259         struct ide_io_ports *io_ports = &hwif->io_ports;
 260         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 261         int use_altstatus = 0, rc;
 262         unsigned long timeout;
 263         u8 s = 0, a = 0;
 264
 265         /* take a deep breath */
 266         msleep(50);
 267
 268         if (io_ports->ctl_addr) {
 269                 a = tp_ops->read_altstatus(hwif);
 270                 s = tp_ops->read_status(hwif);
 271                 if ((a ^ s) & ~ATA_IDX)
 272                         /* ancient Seagate drives, broken interfaces */
 273                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 274                                          "instead of ALTSTATUS(0x%02x)\n",
 275                                          drive->name, s, a);
 276                 else
 277                         /* use non-intrusive polling */
 278                         use_altstatus = 1;
 279         }
 280
 281         /* set features register for atapi
 282          * identify command to be sure of reply
 283          */
 284         if (cmd == ATA_CMD_ID_ATAPI) {
 285                 ide_task_t task;
 286
 287                 memset(&task, 0, sizeof(task));
 288                 /* disable DMA & overlap */
 289                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 290
 291                 tp_ops->tf_load(drive, &task);
 292         }
 293
 294         /* ask drive for ID */
 295         tp_ops->exec_command(hwif, cmd);
 296
 297         timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 298
 299         if (ide_busy_sleep(hwif, timeout, use_altstatus))
 300                 return 1;
 301
 302         /* wait for IRQ and ATA_DRQ */
 303         msleep(50);
 304         s = tp_ops->read_status(hwif);
 305
 306         if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
 307                 unsigned long flags;
 308
 309                 /* local CPU only; some systems need this */
 310                 local_irq_save(flags);
 311                 /* drive returned ID */
 312                 do_identify(drive, cmd);
 313                 /* drive responded with ID */
 314                 rc = 0;
 315                 /* clear drive IRQ */
 316                 (void)tp_ops->read_status(hwif);
 317                 local_irq_restore(flags);
 318         } else {
 319                 /* drive refused ID */
 320                 rc = 2;
 321         }
 322         return rc;
 323 }
 324
 325 /**
 326  *      try_to_identify -       try to identify a drive
 327  *      @drive: drive to probe
 328  *      @cmd: command to use
 329  *
 330  *      Issue the identify command and then do IRQ probing to
 331  *      complete the identification when needed by finding the
 332  *      IRQ the drive is attached to
 333  */
 334
 335 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 336 {
 337         ide_hwif_t *hwif = HWIF(drive);
 338         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 339         int retval;
 340         int autoprobe = 0;
 341         unsigned long cookie = 0;
 342
 343         /*
 344          * Disable device irq unless we need to
 345          * probe for it. Otherwise we'll get spurious
 346          * interrupts during the identify-phase that
 347          * the irq handler isn't expecting.
 348          */
 349         if (hwif->io_ports.ctl_addr) {
 350                 if (!hwif->irq) {
 351                         autoprobe = 1;
 352                         cookie = probe_irq_on();
 353                 }
 354                 tp_ops->set_irq(hwif, autoprobe);
 355         }
 356
 357         retval = actual_try_to_identify(drive, cmd);
 358
 359         if (autoprobe) {
 360                 int irq;
 361
 362                 tp_ops->set_irq(hwif, 0);
 363                 /* clear drive IRQ */
 364                 (void)tp_ops->read_status(hwif);
 365                 udelay(5);
 366                 irq = probe_irq_off(cookie);
 367                 if (!hwif->irq) {
 368                         if (irq > 0) {
 369                                 hwif->irq = irq;
 370                         } else {
 371                                 /* Mmmm.. multiple IRQs..
 372                                  * don't know which was ours
 373                                  */
 374                                 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
 375                                         drive->name, cookie);
 376                         }
 377                 }
 378         }
 379         return retval;
 380 }
 381
 382 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
 383 {
 384         u8 stat;
 385
 386         timeout += jiffies;
 387
 388         do {
 389                 msleep(50);     /* give drive a breather */
 390                 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
 391                                  : hwif->tp_ops->read_status(hwif);
 392                 if ((stat & ATA_BUSY) == 0)
 393                         return 0;
 394         } while (time_before(jiffies, timeout));
 395
 396         return 1;       /* drive timed-out */
 397 }
 398
 399 static u8 ide_read_device(ide_drive_t *drive)
 400 {
 401         ide_task_t task;
 402
 403         memset(&task, 0, sizeof(task));
 404         task.tf_flags = IDE_TFLAG_IN_DEVICE;
 405
 406         drive->hwif->tp_ops->tf_read(drive, &task);
 407
 408         return task.tf.device;
 409 }
 410
 411 /**
 412  *      do_probe                -       probe an IDE device
 413  *      @drive: drive to probe
 414  *      @cmd: command to use
 415  *
 416  *      do_probe() has the difficult job of finding a drive if it exists,
 417  *      without getting hung up if it doesn't exist, without trampling on
 418  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 419  *
 420  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 421  *      but does not respond right away, the probe will "hang in there"
 422  *      for the maximum wait time (about 30 seconds), otherwise it will
 423  *      exit much more quickly.
 424  *
 425  * Returns:     0  device was identified
 426  *              1  device timed-out (no response to identify request)
 427  *              2  device aborted the command (refused to identify itself)
 428  *              3  bad status from device (possible for ATAPI drives)
 429  *              4  probe was not attempted because failure was obvious
 430  */
 431
 432 static int do_probe (ide_drive_t *drive, u8 cmd)
 433 {
 434         ide_hwif_t *hwif = HWIF(drive);
 435         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 436         int rc;
 437         u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
 438
 439         /* avoid waiting for inappropriate probes */
 440         if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
 441                 return 4;
 442
 443 #ifdef DEBUG
 444         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 445                 drive->name, present, drive->media,
 446                 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
 447 #endif
 448
 449         /* needed for some systems
 450          * (e.g. crw9624 as drive0 with disk as slave)
 451          */
 452         msleep(50);
 453         SELECT_DRIVE(drive);
 454         msleep(50);
 455
 456         if (ide_read_device(drive) != drive->select && present == 0) {
 457                 if (drive->dn & 1) {
 458                         /* exit with drive0 selected */
 459                         SELECT_DRIVE(&hwif->drives[0]);
 460                         /* allow ATA_BUSY to assert & clear */
 461                         msleep(50);
 462                 }
 463                 /* no i/f present: mmm.. this should be a 4 -ml */
 464                 return 3;
 465         }
 466
 467         stat = tp_ops->read_status(hwif);
 468
 469         if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
 470             present || cmd == ATA_CMD_ID_ATAPI) {
 471                 /* send cmd and wait */
 472                 if ((rc = try_to_identify(drive, cmd))) {
 473                         /* failed: try again */
 474                         rc = try_to_identify(drive,cmd);
 475                 }
 476
 477                 stat = tp_ops->read_status(hwif);
 478
 479                 if (stat == (ATA_BUSY | ATA_DRDY))
 480                         return 4;
 481
 482                 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
 483                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 484                                         "resetting drive\n", drive->name, stat);
 485                         msleep(50);
 486                         SELECT_DRIVE(drive);
 487                         msleep(50);
 488                         tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 489                         (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
 490                         rc = try_to_identify(drive, cmd);
 491                 }
 492
 493                 /* ensure drive IRQ is clear */
 494                 stat = tp_ops->read_status(hwif);
 495
 496                 if (rc == 1)
 497                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 498                                         drive->name, stat);
 499         } else {
 500                 /* not present or maybe ATAPI */
 501                 rc = 3;
 502         }
 503         if (drive->dn & 1) {
 504                 /* exit with drive0 selected */
 505                 SELECT_DRIVE(&hwif->drives[0]);
 506                 msleep(50);
 507                 /* ensure drive irq is clear */
 508                 (void)tp_ops->read_status(hwif);
 509         }
 510         return rc;
 511 }
 512
 513 /*
 514  *
 515  */
 516 static void enable_nest (ide_drive_t *drive)
 517 {
 518         ide_hwif_t *hwif = HWIF(drive);
 519         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 520         u8 stat;
 521
 522         printk(KERN_INFO "%s: enabling %s -- ",
 523                 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
 524
 525         SELECT_DRIVE(drive);
 526         msleep(50);
 527         tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
 528
 529         if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
 530                 printk(KERN_CONT "failed (timeout)\n");
 531                 return;
 532         }
 533
 534         msleep(50);
 535
 536         stat = tp_ops->read_status(hwif);
 537
 538         if (!OK_STAT(stat, 0, BAD_STAT))
 539                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 540         else
 541                 printk(KERN_CONT "success\n");
 542 }
 543
 544 /**
 545  *      probe_for_drives        -       upper level drive probe
 546  *      @drive: drive to probe for
 547  *
 548  *      probe_for_drive() tests for existence of a given drive using do_probe()
 549  *      and presents things to the user as needed.
 550  *
 551  *      Returns:        0  no device was found
 552  *                      1  device was found
 553  *                         (note: IDE_DFLAG_PRESENT might still be not set)
 554  */
 555
 556 static inline u8 probe_for_drive (ide_drive_t *drive)
 557 {
 558         char *m;
 559
 560         /*
 561          *      In order to keep things simple we have an id
 562          *      block for all drives at all times. If the device
 563          *      is pre ATA or refuses ATA/ATAPI identify we
 564          *      will add faked data to this.
 565          *
 566          *      Also note that 0 everywhere means "can't do X"
 567          */
 568
 569         drive->dev_flags &= ~IDE_DFLAG_ID_READ;
 570
 571         drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
 572         if (drive->id == NULL) {
 573                 printk(KERN_ERR "ide: out of memory for id data.\n");
 574                 return 0;
 575         }
 576
 577         m = (char *)&drive->id[ATA_ID_PROD];
 578         strcpy(m, "UNKNOWN");
 579
 580         /* skip probing? */
 581         if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
 582 retry:
 583                 /* if !(success||timed-out) */
 584                 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
 585                         /* look for ATAPI device */
 586                         (void)do_probe(drive, ATA_CMD_ID_ATAPI);
 587
 588                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 589                         /* drive not found */
 590                         return 0;
 591
 592                 if (strstr(m, "E X A B Y T E N E S T")) {
 593                         enable_nest(drive);
 594                         goto retry;
 595                 }
 596
 597                 /* identification failed? */
 598                 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 599                         if (drive->media == ide_disk) {
 600                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 601                                         drive->name, drive->cyl,
 602                                         drive->head, drive->sect);
 603                         } else if (drive->media == ide_cdrom) {
 604                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 605                         } else {
 606                                 /* nuke it */
 607                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 608                                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 609                         }
 610                 }
 611                 /* drive was found */
 612         }
 613
 614         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 615                 return 0;
 616
 617         /* The drive wasn't being helpful. Add generic info only */
 618         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 619                 generic_id(drive);
 620                 return 1;
 621         }
 622
 623         if (drive->media == ide_disk) {
 624                 ide_disk_init_chs(drive);
 625                 ide_disk_init_mult_count(drive);
 626         }
 627
 628         return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
 629 }
 630
 631 static void hwif_release_dev(struct device *dev)
 632 {
 633         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 634
 635         complete(&hwif->gendev_rel_comp);
 636 }
 637
 638 static int ide_register_port(ide_hwif_t *hwif)
 639 {
 640         int ret;
 641
 642         /* register with global device tree */
 643         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 644         hwif->gendev.driver_data = hwif;
 645         if (hwif->gendev.parent == NULL) {
 646                 if (hwif->dev)
 647                         hwif->gendev.parent = hwif->dev;
 648                 else
 649                         /* Would like to do = &device_legacy */
 650                         hwif->gendev.parent = NULL;
 651         }
 652         hwif->gendev.release = hwif_release_dev;
 653         ret = device_register(&hwif->gendev);
 654         if (ret < 0) {
 655                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 656                         __func__, ret);
 657                 goto out;
 658         }
 659
 660         hwif->portdev = device_create(ide_port_class, &hwif->gendev,
 661                                       MKDEV(0, 0), hwif, hwif->name);
 662         if (IS_ERR(hwif->portdev)) {
 663                 ret = PTR_ERR(hwif->portdev);
 664                 device_unregister(&hwif->gendev);
 665         }
 666 out:
 667         return ret;
 668 }
 669
 670 /**
 671  *      ide_port_wait_ready     -       wait for port to become ready
 672  *      @hwif: IDE port
 673  *
 674  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 675  *      platforms.  Typical cases are:
 676  *
 677  *      - The firmware hard reset the disk before booting the kernel,
 678  *        the drive is still doing it's poweron-reset sequence, that
 679  *        can take up to 30 seconds.
 680  *
 681  *      - The firmware does nothing (or no firmware), the device is
 682  *        still in POST state (same as above actually).
 683  *
 684  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 685  *        their reset sequence even when they are non-selected slave
 686  *        devices, thus preventing discovery of the main HD.
 687  *
 688  *      Doing this wait-for-non-busy should not harm any existing
 689  *      configuration and fix some issues like the above.
 690  *
 691  *      BenH.
 692  *
 693  *      Returns 0 on success, error code (< 0) otherwise.
 694  */
 695
 696 static int ide_port_wait_ready(ide_hwif_t *hwif)
 697 {
 698         int unit, rc;
 699
 700         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 701
 702         /* Let HW settle down a bit from whatever init state we
 703          * come from */
 704         mdelay(2);
 705
 706         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 707          * I know of at least one disk who takes 31 seconds, I use 35
 708          * here to be safe
 709          */
 710         rc = ide_wait_not_busy(hwif, 35000);
 711         if (rc)
 712                 return rc;
 713
 714         /* Now make sure both master & slave are ready */
 715         for (unit = 0; unit < MAX_DRIVES; unit++) {
 716                 ide_drive_t *drive = &hwif->drives[unit];
 717
 718                 /* Ignore disks that we will not probe for later. */
 719                 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
 720                     (drive->dev_flags & IDE_DFLAG_PRESENT)) {
 721                         SELECT_DRIVE(drive);
 722                         hwif->tp_ops->set_irq(hwif, 1);
 723                         mdelay(2);
 724                         rc = ide_wait_not_busy(hwif, 35000);
 725                         if (rc)
 726                                 goto out;
 727                 } else
 728                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 729                                           drive->name);
 730         }
 731 out:
 732         /* Exit function with master reselected (let's be sane) */
 733         if (unit)
 734                 SELECT_DRIVE(&hwif->drives[0]);
 735
 736         return rc;
 737 }
 738
 739 /**
 740  *      ide_undecoded_slave     -       look for bad CF adapters
 741  *      @dev1: slave device
 742  *
 743  *      Analyse the drives on the interface and attempt to decide if we
 744  *      have the same drive viewed twice. This occurs with crap CF adapters
 745  *      and PCMCIA sometimes.
 746  */
 747
 748 void ide_undecoded_slave(ide_drive_t *dev1)
 749 {
 750         ide_drive_t *dev0 = &dev1->hwif->drives[0];
 751
 752         if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
 753                 return;
 754
 755         /* If the models don't match they are not the same product */
 756         if (strcmp((char *)&dev0->id[ATA_ID_PROD],
 757                    (char *)&dev1->id[ATA_ID_PROD]))
 758                 return;
 759
 760         /* Serial numbers do not match */
 761         if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
 762                     (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
 763                 return;
 764
 765         /* No serial number, thankfully very rare for CF */
 766         if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
 767                 return;
 768
 769         /* Appears to be an IDE flash adapter with decode bugs */
 770         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 771
 772         dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
 773 }
 774
 775 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 776
 777 static int ide_probe_port(ide_hwif_t *hwif)
 778 {
 779         unsigned long flags;
 780         unsigned int irqd;
 781         int unit, rc = -ENODEV;
 782
 783         BUG_ON(hwif->present);
 784
 785         if ((hwif->drives[0].dev_flags & IDE_DFLAG_NOPROBE) &&
 786             (hwif->drives[1].dev_flags & IDE_DFLAG_NOPROBE))
 787                 return -EACCES;
 788
 789         /*
 790          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 791          * we'll install our IRQ driver much later...
 792          */
 793         irqd = hwif->irq;
 794         if (irqd)
 795                 disable_irq(hwif->irq);
 796
 797         local_irq_set(flags);
 798
 799         if (ide_port_wait_ready(hwif) == -EBUSY)
 800                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 801
 802         /*
 803          * Second drive should only exist if first drive was found,
 804          * but a lot of cdrom drives are configured as single slaves.
 805          */
 806         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 807                 ide_drive_t *drive = &hwif->drives[unit];
 808
 809                 (void) probe_for_drive(drive);
 810                 if (drive->dev_flags & IDE_DFLAG_PRESENT)
 811                         rc = 0;
 812         }
 813
 814         local_irq_restore(flags);
 815
 816         /*
 817          * Use cached IRQ number. It might be (and is...) changed by probe
 818          * code above
 819          */
 820         if (irqd)
 821                 enable_irq(irqd);
 822
 823         return rc;
 824 }
 825
 826 static void ide_port_tune_devices(ide_hwif_t *hwif)
 827 {
 828         const struct ide_port_ops *port_ops = hwif->port_ops;
 829         int unit;
 830
 831         for (unit = 0; unit < MAX_DRIVES; unit++) {
 832                 ide_drive_t *drive = &hwif->drives[unit];
 833
 834                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 835                         if (port_ops && port_ops->quirkproc)
 836                                 port_ops->quirkproc(drive);
 837                 }
 838         }
 839
 840         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 841                 ide_drive_t *drive = &hwif->drives[unit];
 842
 843                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 844                         ide_set_max_pio(drive);
 845
 846                         drive->dev_flags |= IDE_DFLAG_NICE1;
 847
 848                         if (hwif->dma_ops)
 849                                 ide_set_dma(drive);
 850                 }
 851         }
 852
 853         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 854                 ide_drive_t *drive = &hwif->drives[unit];
 855
 856                 if ((hwif->host_flags & IDE_HFLAG_NO_IO_32BIT) ||
 857                     drive->id[ATA_ID_DWORD_IO])
 858                         drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
 859                 else
 860                         drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
 861         }
 862 }
 863
 864 /*
 865  * save_match() is used to simplify logic in init_irq() below.
 866  *
 867  * A loophole here is that we may not know about a particular
 868  * hwif's irq until after that hwif is actually probed/initialized..
 869  * This could be a problem for the case where an hwif is on a
 870  * dual interface that requires serialization (eg. cmd640) and another
 871  * hwif using one of the same irqs is initialized beforehand.
 872  *
 873  * This routine detects and reports such situations, but does not fix them.
 874  */
 875 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 876 {
 877         ide_hwif_t *m = *match;
 878
 879         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 880                 if (!new->hwgroup)
 881                         return;
 882                 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
 883                         hwif->name, new->name, m->name);
 884         }
 885         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 886                 *match = new;
 887 }
 888
 889 /*
 890  * init request queue
 891  */
 892 static int ide_init_queue(ide_drive_t *drive)
 893 {
 894         struct request_queue *q;
 895         ide_hwif_t *hwif = HWIF(drive);
 896         int max_sectors = 256;
 897         int max_sg_entries = PRD_ENTRIES;
 898
 899         /*
 900          *      Our default set up assumes the normal IDE case,
 901          *      that is 64K segmenting, standard PRD setup
 902          *      and LBA28. Some drivers then impose their own
 903          *      limits and LBA48 we could raise it but as yet
 904          *      do not.
 905          */
 906
 907         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 908         if (!q)
 909                 return 1;
 910
 911         q->queuedata = drive;
 912         blk_queue_segment_boundary(q, 0xffff);
 913
 914         if (hwif->rqsize < max_sectors)
 915                 max_sectors = hwif->rqsize;
 916         blk_queue_max_sectors(q, max_sectors);
 917
 918 #ifdef CONFIG_PCI
 919         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 920          * creates segments that don't completely match our boundary
 921          * requirements and thus need to be broken up again. Because it
 922          * doesn't align properly either, we may actually have to break up
 923          * to more segments than what was we got in the first place, a max
 924          * worst case is twice as many.
 925          * This will be fixed once we teach pci_map_sg() about our boundary
 926          * requirements, hopefully soon. *FIXME*
 927          */
 928         if (!PCI_DMA_BUS_IS_PHYS)
 929                 max_sg_entries >>= 1;
 930 #endif /* CONFIG_PCI */
 931
 932         blk_queue_max_hw_segments(q, max_sg_entries);
 933         blk_queue_max_phys_segments(q, max_sg_entries);
 934
 935         /* assign drive queue */
 936         drive->queue = q;
 937
 938         /* needs drive->queue to be set */
 939         ide_toggle_bounce(drive, 1);
 940
 941         return 0;
 942 }
 943
 944 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 945 {
 946         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 947
 948         spin_lock_irq(&ide_lock);
 949         if (!hwgroup->drive) {
 950                 /* first drive for hwgroup. */
 951                 drive->next = drive;
 952                 hwgroup->drive = drive;
 953                 hwgroup->hwif = HWIF(hwgroup->drive);
 954         } else {
 955                 drive->next = hwgroup->drive->next;
 956                 hwgroup->drive->next = drive;
 957         }
 958         spin_unlock_irq(&ide_lock);
 959 }
 960
 961 /*
 962  * For any present drive:
 963  * - allocate the block device queue
 964  * - link drive into the hwgroup
 965  */
 966 static int ide_port_setup_devices(ide_hwif_t *hwif)
 967 {
 968         int i, j = 0;
 969
 970         mutex_lock(&ide_cfg_mtx);
 971         for (i = 0; i < MAX_DRIVES; i++) {
 972                 ide_drive_t *drive = &hwif->drives[i];
 973
 974                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 975                         continue;
 976
 977                 if (ide_init_queue(drive)) {
 978                         printk(KERN_ERR "ide: failed to init %s\n",
 979                                         drive->name);
 980                         kfree(drive->id);
 981                         drive->id = NULL;
 982                         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 983                         continue;
 984                 }
 985
 986                 j++;
 987
 988                 ide_add_drive_to_hwgroup(drive);
 989         }
 990         mutex_unlock(&ide_cfg_mtx);
 991
 992         return j;
 993 }
 994
 995 static ide_hwif_t *ide_ports[MAX_HWIFS];
 996
 997 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 998 {
 999         ide_hwgroup_t *hwgroup = hwif->hwgroup;
1000
1001         ide_ports[hwif->index] = NULL;
1002
1003         spin_lock_irq(&ide_lock);
1004         /*
1005          * Remove us from the hwgroup, and free
1006          * the hwgroup if we were the only member
1007          */
1008         if (hwif->next == hwif) {
1009                 BUG_ON(hwgroup->hwif != hwif);
1010                 kfree(hwgroup);
1011         } else {
1012                 /* There is another interface in hwgroup.
1013                  * Unlink us, and set hwgroup->drive and ->hwif to
1014                  * something sane.
1015                  */
1016                 ide_hwif_t *g = hwgroup->hwif;
1017
1018                 while (g->next != hwif)
1019                         g = g->next;
1020                 g->next = hwif->next;
1021                 if (hwgroup->hwif == hwif) {
1022                         /* Chose a random hwif for hwgroup->hwif.
1023                          * It's guaranteed that there are no drives
1024                          * left in the hwgroup.
1025                          */
1026                         BUG_ON(hwgroup->drive != NULL);
1027                         hwgroup->hwif = g;
1028                 }
1029                 BUG_ON(hwgroup->hwif == hwif);
1030         }
1031         spin_unlock_irq(&ide_lock);
1032 }
1033
1034 /*
1035  * This routine sets up the irq for an ide interface, and creates a new
1036  * hwgroup for the irq/hwif if none was previously assigned.
1037  *
1038  * Much of the code is for correctly detecting/handling irq sharing
1039  * and irq serialization situations.  This is somewhat complex because
1040  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1041  */
1042 static int init_irq (ide_hwif_t *hwif)
1043 {
1044         struct ide_io_ports *io_ports = &hwif->io_ports;
1045         unsigned int index;
1046         ide_hwgroup_t *hwgroup;
1047         ide_hwif_t *match = NULL;
1048
1049         mutex_lock(&ide_cfg_mtx);
1050         hwif->hwgroup = NULL;
1051
1052         /*
1053          * Group up with any other hwifs that share our irq(s).
1054          */
1055         for (index = 0; index < MAX_HWIFS; index++) {
1056                 ide_hwif_t *h = ide_ports[index];
1057
1058                 if (h && h->hwgroup) {  /* scan only initialized ports */
1059                         if (hwif->irq == h->irq) {
1060                                 hwif->sharing_irq = h->sharing_irq = 1;
1061                                 if (hwif->chipset != ide_pci ||
1062                                     h->chipset != ide_pci) {
1063                                         save_match(hwif, h, &match);
1064                                 }
1065                         }
1066                         if (hwif->serialized) {
1067                                 if (hwif->mate && hwif->mate->irq == h->irq)
1068                                         save_match(hwif, h, &match);
1069                         }
1070                         if (h->serialized) {
1071                                 if (h->mate && hwif->irq == h->mate->irq)
1072                                         save_match(hwif, h, &match);
1073                         }
1074                 }
1075         }
1076
1077         /*
1078          * If we are still without a hwgroup, then form a new one
1079          */
1080         if (match) {
1081                 hwgroup = match->hwgroup;
1082                 hwif->hwgroup = hwgroup;
1083                 /*
1084                  * Link us into the hwgroup.
1085                  * This must be done early, do ensure that unexpected_intr
1086                  * can find the hwif and prevent irq storms.
1087                  * No drives are attached to the new hwif, choose_drive
1088                  * can't do anything stupid (yet).
1089                  * Add ourself as the 2nd entry to the hwgroup->hwif
1090                  * linked list, the first entry is the hwif that owns
1091                  * hwgroup->handler - do not change that.
1092                  */
1093                 spin_lock_irq(&ide_lock);
1094                 hwif->next = hwgroup->hwif->next;
1095                 hwgroup->hwif->next = hwif;
1096                 BUG_ON(hwif->next == hwif);
1097                 spin_unlock_irq(&ide_lock);
1098         } else {
1099                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1100                                        hwif_to_node(hwif));
1101                 if (hwgroup == NULL)
1102                         goto out_up;
1103
1104                 hwif->hwgroup = hwgroup;
1105                 hwgroup->hwif = hwif->next = hwif;
1106
1107                 init_timer(&hwgroup->timer);
1108                 hwgroup->timer.function = &ide_timer_expiry;
1109                 hwgroup->timer.data = (unsigned long) hwgroup;
1110         }
1111
1112         ide_ports[hwif->index] = hwif;
1113
1114         /*
1115          * Allocate the irq, if not already obtained for another hwif
1116          */
1117         if (!match || match->irq != hwif->irq) {
1118                 int sa = 0;
1119 #if defined(__mc68000__)
1120                 sa = IRQF_SHARED;
1121 #endif /* __mc68000__ */
1122
1123                 if (hwif->chipset == ide_pci || hwif->chipset == ide_cmd646 ||
1124                     hwif->chipset == ide_ali14xx)
1125                         sa = IRQF_SHARED;
1126
1127                 if (io_ports->ctl_addr)
1128                         hwif->tp_ops->set_irq(hwif, 1);
1129
1130                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1131                         goto out_unlink;
1132         }
1133
1134         if (!hwif->rqsize) {
1135                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1136                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1137                         hwif->rqsize = 256;
1138                 else
1139                         hwif->rqsize = 65536;
1140         }
1141
1142 #if !defined(__mc68000__)
1143         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1144                 io_ports->data_addr, io_ports->status_addr,
1145                 io_ports->ctl_addr, hwif->irq);
1146 #else
1147         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
1148                 io_ports->data_addr, hwif->irq);
1149 #endif /* __mc68000__ */
1150         if (match)
1151                 printk(KERN_CONT " (%sed with %s)",
1152                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1153         printk(KERN_CONT "\n");
1154
1155         mutex_unlock(&ide_cfg_mtx);
1156         return 0;
1157 out_unlink:
1158         ide_remove_port_from_hwgroup(hwif);
1159 out_up:
1160         mutex_unlock(&ide_cfg_mtx);
1161         return 1;
1162 }
1163
1164 static int ata_lock(dev_t dev, void *data)
1165 {
1166         /* FIXME: we want to pin hwif down */
1167         return 0;
1168 }
1169
1170 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1171 {
1172         ide_hwif_t *hwif = data;
1173         int unit = *part >> PARTN_BITS;
1174         ide_drive_t *drive = &hwif->drives[unit];
1175
1176         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1177                 return NULL;
1178
1179         if (drive->media == ide_disk)
1180                 request_module("ide-disk");
1181         if (drive->dev_flags & IDE_DFLAG_SCSI)
1182                 request_module("ide-scsi");
1183         if (drive->media == ide_cdrom || drive->media == ide_optical)
1184                 request_module("ide-cd");
1185         if (drive->media == ide_tape)
1186                 request_module("ide-tape");
1187         if (drive->media == ide_floppy)
1188                 request_module("ide-floppy");
1189
1190         return NULL;
1191 }
1192
1193 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1194 {
1195         struct gendisk *p = data;
1196         *part &= (1 << PARTN_BITS) - 1;
1197         return &disk_to_dev(p)->kobj;
1198 }
1199
1200 static int exact_lock(dev_t dev, void *data)
1201 {
1202         struct gendisk *p = data;
1203
1204         if (!get_disk(p))
1205                 return -1;
1206         return 0;
1207 }
1208
1209 void ide_register_region(struct gendisk *disk)
1210 {
1211         blk_register_region(MKDEV(disk->major, disk->first_minor),
1212                             disk->minors, NULL, exact_match, exact_lock, disk);
1213 }
1214
1215 EXPORT_SYMBOL_GPL(ide_register_region);
1216
1217 void ide_unregister_region(struct gendisk *disk)
1218 {
1219         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1220                               disk->minors);
1221 }
1222
1223 EXPORT_SYMBOL_GPL(ide_unregister_region);
1224
1225 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1226 {
1227         ide_hwif_t *hwif = drive->hwif;
1228         unsigned int unit = drive->dn & 1;
1229
1230         disk->major = hwif->major;
1231         disk->first_minor = unit << PARTN_BITS;
1232         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1233         disk->queue = drive->queue;
1234 }
1235
1236 EXPORT_SYMBOL_GPL(ide_init_disk);
1237
1238 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1239 {
1240         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1241
1242         if (drive == drive->next) {
1243                 /* special case: last drive from hwgroup. */
1244                 BUG_ON(hwgroup->drive != drive);
1245                 hwgroup->drive = NULL;
1246         } else {
1247                 ide_drive_t *walk;
1248
1249                 walk = hwgroup->drive;
1250                 while (walk->next != drive)
1251                         walk = walk->next;
1252                 walk->next = drive->next;
1253                 if (hwgroup->drive == drive) {
1254                         hwgroup->drive = drive->next;
1255                         hwgroup->hwif = hwgroup->drive->hwif;
1256                 }
1257         }
1258         BUG_ON(hwgroup->drive == drive);
1259 }
1260
1261 static void drive_release_dev (struct device *dev)
1262 {
1263         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1264
1265         ide_proc_unregister_device(drive);
1266
1267         spin_lock_irq(&ide_lock);
1268         ide_remove_drive_from_hwgroup(drive);
1269         kfree(drive->id);
1270         drive->id = NULL;
1271         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1272         /* Messed up locking ... */
1273         spin_unlock_irq(&ide_lock);
1274         blk_cleanup_queue(drive->queue);
1275         spin_lock_irq(&ide_lock);
1276         drive->queue = NULL;
1277         spin_unlock_irq(&ide_lock);
1278
1279         complete(&drive->gendev_rel_comp);
1280 }
1281
1282 static int hwif_init(ide_hwif_t *hwif)
1283 {
1284         int old_irq;
1285
1286         if (!hwif->irq) {
1287                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1288                 if (!hwif->irq) {
1289                         printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1290                         return 0;
1291                 }
1292         }
1293
1294         if (register_blkdev(hwif->major, hwif->name))
1295                 return 0;
1296
1297         if (!hwif->sg_max_nents)
1298                 hwif->sg_max_nents = PRD_ENTRIES;
1299
1300         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1301                                  GFP_KERNEL);
1302         if (!hwif->sg_table) {
1303                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1304                 goto out;
1305         }
1306
1307         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1308
1309         if (init_irq(hwif) == 0)
1310                 goto done;
1311
1312         old_irq = hwif->irq;
1313         /*
1314          *      It failed to initialise. Find the default IRQ for
1315          *      this port and try that.
1316          */
1317         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1318         if (!hwif->irq) {
1319                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1320                         hwif->name, old_irq);
1321                 goto out;
1322         }
1323         if (init_irq(hwif)) {
1324                 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1325                         hwif->name, old_irq, hwif->irq);
1326                 goto out;
1327         }
1328         printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1329                 hwif->name, hwif->irq);
1330
1331 done:
1332         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1333                             THIS_MODULE, ata_probe, ata_lock, hwif);
1334         return 1;
1335
1336 out:
1337         unregister_blkdev(hwif->major, hwif->name);
1338         return 0;
1339 }
1340
1341 static void hwif_register_devices(ide_hwif_t *hwif)
1342 {
1343         unsigned int i;
1344
1345         for (i = 0; i < MAX_DRIVES; i++) {
1346                 ide_drive_t *drive = &hwif->drives[i];
1347                 struct device *dev = &drive->gendev;
1348                 int ret;
1349
1350                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1351                         continue;
1352
1353                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1354                 dev->parent = &hwif->gendev;
1355                 dev->bus = &ide_bus_type;
1356                 dev->driver_data = drive;
1357                 dev->release = drive_release_dev;
1358
1359                 ret = device_register(dev);
1360                 if (ret < 0)
1361                         printk(KERN_WARNING "IDE: %s: device_register error: "
1362                                             "%d\n", __func__, ret);
1363         }
1364 }
1365
1366 static void ide_port_init_devices(ide_hwif_t *hwif)
1367 {
1368         const struct ide_port_ops *port_ops = hwif->port_ops;
1369         int i;
1370
1371         for (i = 0; i < MAX_DRIVES; i++) {
1372                 ide_drive_t *drive = &hwif->drives[i];
1373
1374                 drive->dn = i + hwif->channel * 2;
1375
1376                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1377                         drive->io_32bit = 1;
1378                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1379                         drive->dev_flags |= IDE_DFLAG_UNMASK;
1380                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1381                         drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1382
1383                 if (port_ops && port_ops->init_dev)
1384                         port_ops->init_dev(drive);
1385         }
1386 }
1387
1388 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1389                           const struct ide_port_info *d)
1390 {
1391         hwif->channel = port;
1392
1393         if (d->chipset)
1394                 hwif->chipset = d->chipset;
1395
1396         if (d->init_iops)
1397                 d->init_iops(hwif);
1398
1399         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1400             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1401                 hwif->irq = port ? 15 : 14;
1402
1403         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1404         hwif->host_flags |= d->host_flags;
1405         hwif->pio_mask = d->pio_mask;
1406
1407         if (d->tp_ops)
1408                 hwif->tp_ops = d->tp_ops;
1409
1410         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1411         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1412                 hwif->port_ops = d->port_ops;
1413
1414         hwif->swdma_mask = d->swdma_mask;
1415         hwif->mwdma_mask = d->mwdma_mask;
1416         hwif->ultra_mask = d->udma_mask;
1417
1418         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1419                 int rc;
1420
1421                 if (d->init_dma)
1422                         rc = d->init_dma(hwif, d);
1423                 else
1424                         rc = ide_hwif_setup_dma(hwif, d);
1425
1426                 if (rc < 0) {
1427                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1428                         hwif->dma_base = 0;
1429                         hwif->swdma_mask = 0;
1430                         hwif->mwdma_mask = 0;
1431                         hwif->ultra_mask = 0;
1432                 } else if (d->dma_ops)
1433                         hwif->dma_ops = d->dma_ops;
1434         }
1435
1436         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1437             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1438                 if (hwif->mate)
1439                         hwif->mate->serialized = hwif->serialized = 1;
1440         }
1441
1442         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1443                 hwif->rqsize = 256;
1444
1445         /* call chipset specific routine for each enabled port */
1446         if (d->init_hwif)
1447                 d->init_hwif(hwif);
1448 }
1449
1450 static void ide_port_cable_detect(ide_hwif_t *hwif)
1451 {
1452         const struct ide_port_ops *port_ops = hwif->port_ops;
1453
1454         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1455                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1456                         hwif->cbl = port_ops->cable_detect(hwif);
1457         }
1458 }
1459
1460 static ssize_t store_delete_devices(struct device *portdev,
1461                                     struct device_attribute *attr,
1462                                     const char *buf, size_t n)
1463 {
1464         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1465
1466         if (strncmp(buf, "1", n))
1467                 return -EINVAL;
1468
1469         ide_port_unregister_devices(hwif);
1470
1471         return n;
1472 };
1473
1474 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1475
1476 static ssize_t store_scan(struct device *portdev,
1477                           struct device_attribute *attr,
1478                           const char *buf, size_t n)
1479 {
1480         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1481
1482         if (strncmp(buf, "1", n))
1483                 return -EINVAL;
1484
1485         ide_port_unregister_devices(hwif);
1486         ide_port_scan(hwif);
1487
1488         return n;
1489 };
1490
1491 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1492
1493 static struct device_attribute *ide_port_attrs[] = {
1494         &dev_attr_delete_devices,
1495         &dev_attr_scan,
1496         NULL
1497 };
1498
1499 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1500 {
1501         int i, uninitialized_var(rc);
1502
1503         for (i = 0; ide_port_attrs[i]; i++) {
1504                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1505                 if (rc)
1506                         break;
1507         }
1508
1509         return rc;
1510 }
1511
1512 static unsigned int ide_indexes;
1513
1514 /**
1515  *      ide_find_port_slot      -       find free port slot
1516  *      @d: IDE port info
1517  *
1518  *      Return the new port slot index or -ENOENT if we are out of free slots.
1519  */
1520
1521 static int ide_find_port_slot(const struct ide_port_info *d)
1522 {
1523         int idx = -ENOENT;
1524         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1525         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1526
1527         /*
1528          * Claim an unassigned slot.
1529          *
1530          * Give preference to claiming other slots before claiming ide0/ide1,
1531          * just in case there's another interface yet-to-be-scanned
1532          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1533          *
1534          * Unless there is a bootable card that does not use the standard
1535          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1536          */
1537         mutex_lock(&ide_cfg_mtx);
1538         if (bootable) {
1539                 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1540                         idx = ffz(ide_indexes | i);
1541         } else {
1542                 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1543                         idx = ffz(ide_indexes | 3);
1544                 else if ((ide_indexes & 3) != 3)
1545                         idx = ffz(ide_indexes);
1546         }
1547         if (idx >= 0)
1548                 ide_indexes |= (1 << idx);
1549         mutex_unlock(&ide_cfg_mtx);
1550
1551         return idx;
1552 }
1553
1554 static void ide_free_port_slot(int idx)
1555 {
1556         mutex_lock(&ide_cfg_mtx);
1557         ide_indexes &= ~(1 << idx);
1558         mutex_unlock(&ide_cfg_mtx);
1559 }
1560
1561 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1562 {
1563         struct ide_host *host;
1564         int i;
1565
1566         host = kzalloc(sizeof(*host), GFP_KERNEL);
1567         if (host == NULL)
1568                 return NULL;
1569
1570         for (i = 0; i < MAX_HOST_PORTS; i++) {
1571                 ide_hwif_t *hwif;
1572                 int idx;
1573
1574                 if (hws[i] == NULL)
1575                         continue;
1576
1577                 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1578                 if (hwif == NULL)
1579                         continue;
1580
1581                 idx = ide_find_port_slot(d);
1582                 if (idx < 0) {
1583                         printk(KERN_ERR "%s: no free slot for interface\n",
1584                                         d ? d->name : "ide");
1585                         kfree(hwif);
1586                         continue;
1587                 }
1588
1589                 ide_init_port_data(hwif, idx);
1590
1591                 hwif->host = host;
1592
1593                 host->ports[i] = hwif;
1594                 host->n_ports++;
1595         }
1596
1597         if (host->n_ports == 0) {
1598                 kfree(host);
1599                 return NULL;
1600         }
1601
1602         if (hws[0])
1603                 host->dev[0] = hws[0]->dev;
1604
1605         if (d) {
1606                 host->init_chipset = d->init_chipset;
1607                 host->host_flags = d->host_flags;
1608         }
1609
1610         return host;
1611 }
1612 EXPORT_SYMBOL_GPL(ide_host_alloc);
1613
1614 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1615                       hw_regs_t **hws)
1616 {
1617         ide_hwif_t *hwif, *mate = NULL;
1618         int i, j = 0;
1619
1620         for (i = 0; i < MAX_HOST_PORTS; i++) {
1621                 hwif = host->ports[i];
1622
1623                 if (hwif == NULL) {
1624                         mate = NULL;
1625                         continue;
1626                 }
1627
1628                 ide_init_port_hw(hwif, hws[i]);
1629                 ide_port_apply_params(hwif);
1630
1631                 if (d == NULL) {
1632                         mate = NULL;
1633                 } else {
1634                         if ((i & 1) && mate) {
1635                                 hwif->mate = mate;
1636                                 mate->mate = hwif;
1637                         }
1638
1639                         mate = (i & 1) ? NULL : hwif;
1640
1641                         ide_init_port(hwif, i & 1, d);
1642                         ide_port_cable_detect(hwif);
1643                 }
1644
1645                 ide_port_init_devices(hwif);
1646         }
1647
1648         for (i = 0; i < MAX_HOST_PORTS; i++) {
1649                 hwif = host->ports[i];
1650
1651                 if (hwif == NULL)
1652                         continue;
1653
1654                 if (ide_probe_port(hwif) == 0)
1655                         hwif->present = 1;
1656
1657                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1658                     !hwif->mate->present)
1659                         ide_register_port(hwif);
1660
1661                 if (hwif->present)
1662                         ide_port_tune_devices(hwif);
1663         }
1664
1665         for (i = 0; i < MAX_HOST_PORTS; i++) {
1666                 hwif = host->ports[i];
1667
1668                 if (hwif == NULL)
1669                         continue;
1670
1671                 if (hwif_init(hwif) == 0) {
1672                         printk(KERN_INFO "%s: failed to initialize IDE "
1673                                          "interface\n", hwif->name);
1674                         hwif->present = 0;
1675                         continue;
1676                 }
1677
1678                 if (hwif->present)
1679                         if (ide_port_setup_devices(hwif) == 0) {
1680                                 hwif->present = 0;
1681                                 continue;
1682                         }
1683
1684                 j++;
1685
1686                 ide_acpi_init(hwif);
1687
1688                 if (hwif->present)
1689                         ide_acpi_port_init_devices(hwif);
1690         }
1691
1692         for (i = 0; i < MAX_HOST_PORTS; i++) {
1693                 hwif = host->ports[i];
1694
1695                 if (hwif == NULL)
1696                         continue;
1697
1698                 if (hwif->chipset == ide_unknown)
1699                         hwif->chipset = ide_generic;
1700
1701                 if (hwif->present)
1702                         hwif_register_devices(hwif);
1703         }
1704
1705         for (i = 0; i < MAX_HOST_PORTS; i++) {
1706                 hwif = host->ports[i];
1707
1708                 if (hwif == NULL)
1709                         continue;
1710
1711                 ide_sysfs_register_port(hwif);
1712                 ide_proc_register_port(hwif);
1713
1714                 if (hwif->present)
1715                         ide_proc_port_register_devices(hwif);
1716         }
1717
1718         return j ? 0 : -1;
1719 }
1720 EXPORT_SYMBOL_GPL(ide_host_register);
1721
1722 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1723                  struct ide_host **hostp)
1724 {
1725         struct ide_host *host;
1726         int rc;
1727
1728         host = ide_host_alloc(d, hws);
1729         if (host == NULL)
1730                 return -ENOMEM;
1731
1732         rc = ide_host_register(host, d, hws);
1733         if (rc) {
1734                 ide_host_free(host);
1735                 return rc;
1736         }
1737
1738         if (hostp)
1739                 *hostp = host;
1740
1741         return 0;
1742 }
1743 EXPORT_SYMBOL_GPL(ide_host_add);
1744
1745 void ide_host_free(struct ide_host *host)
1746 {
1747         ide_hwif_t *hwif;
1748         int i;
1749
1750         for (i = 0; i < MAX_HOST_PORTS; i++) {
1751                 hwif = host->ports[i];
1752
1753                 if (hwif == NULL)
1754                         continue;
1755
1756                 ide_free_port_slot(hwif->index);
1757                 kfree(hwif);
1758         }
1759
1760         kfree(host);
1761 }
1762 EXPORT_SYMBOL_GPL(ide_host_free);
1763
1764 void ide_host_remove(struct ide_host *host)
1765 {
1766         int i;
1767
1768         for (i = 0; i < MAX_HOST_PORTS; i++) {
1769                 if (host->ports[i])
1770                         ide_unregister(host->ports[i]);
1771         }
1772
1773         ide_host_free(host);
1774 }
1775 EXPORT_SYMBOL_GPL(ide_host_remove);
1776
1777 void ide_port_scan(ide_hwif_t *hwif)
1778 {
1779         ide_port_apply_params(hwif);
1780         ide_port_cable_detect(hwif);
1781         ide_port_init_devices(hwif);
1782
1783         if (ide_probe_port(hwif) < 0)
1784                 return;
1785
1786         hwif->present = 1;
1787
1788         ide_port_tune_devices(hwif);
1789         ide_acpi_port_init_devices(hwif);
1790         ide_port_setup_devices(hwif);
1791         hwif_register_devices(hwif);
1792         ide_proc_port_register_devices(hwif);
1793 }
1794 EXPORT_SYMBOL_GPL(ide_port_scan);
1795
1796 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1797                                 u8 port_no, const struct ide_port_info *d,
1798                                 unsigned long config)
1799 {
1800         unsigned long base, ctl;
1801         int irq;
1802
1803         if (port_no == 0) {
1804                 base = 0x1f0;
1805                 ctl  = 0x3f6;
1806                 irq  = 14;
1807         } else {
1808                 base = 0x170;
1809                 ctl  = 0x376;
1810                 irq  = 15;
1811         }
1812
1813         if (!request_region(base, 8, d->name)) {
1814                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1815                                 d->name, base, base + 7);
1816                 return;
1817         }
1818
1819         if (!request_region(ctl, 1, d->name)) {
1820                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1821                                 d->name, ctl);
1822                 release_region(base, 8);
1823                 return;
1824         }
1825
1826         ide_std_init_ports(hw, base, ctl);
1827         hw->irq = irq;
1828         hw->chipset = d->chipset;
1829         hw->config = config;
1830
1831         hws[port_no] = hw;
1832 }
1833
1834 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1835 {
1836         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1837
1838         memset(&hw, 0, sizeof(hw));
1839
1840         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1841                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1842         ide_legacy_init_one(hws, &hw[1], 1, d, config);
1843
1844         if (hws[0] == NULL && hws[1] == NULL &&
1845             (d->host_flags & IDE_HFLAG_SINGLE))
1846                 return -ENOENT;
1847
1848         return ide_host_add(d, hws, NULL);
1849 }
1850 EXPORT_SYMBOL_GPL(ide_legacy_device_add);