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 ((id[ATA_ID_FIELD_VALID] & 1) && id[ATA_ID_CUR_CYLS] &&
  73             id[ATA_ID_CUR_HEADS] && id[ATA_ID_CUR_HEADS] <= 16 &&
  74             id[ATA_ID_CUR_SECTORS]) {
  75                 drive->cyl  = id[ATA_ID_CUR_CYLS];
  76                 drive->head = id[ATA_ID_CUR_HEADS];
  77                 drive->sect = id[ATA_ID_CUR_SECTORS];
  78         }
  79
  80         /* Use physical geometry if what we have still makes no sense */
  81         if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
  82                 drive->cyl  = id[ATA_ID_CYLS];
  83                 drive->head = id[ATA_ID_HEADS];
  84                 drive->sect = id[ATA_ID_SECTORS];
  85         }
  86 }
  87
  88 static void ide_disk_init_mult_count(ide_drive_t *drive)
  89 {
  90         u16 *id = drive->id;
  91         u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
  92
  93         if (max_multsect) {
  94 #ifdef CONFIG_IDEDISK_MULTI_MODE
  95                 if ((max_multsect / 2) > 1)
  96                         id[ATA_ID_MULTSECT] = max_multsect | 0x100;
  97                 else
  98                         id[ATA_ID_MULTSECT] &= ~0x1ff;
  99
 100                 drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
 101 #endif
 102                 if ((id[ATA_ID_MULTSECT] & 0x100) &&
 103                     (id[ATA_ID_MULTSECT] & 0xff))
 104                         drive->special.b.set_multmode = 1;
 105         }
 106 }
 107
 108 /**
 109  *      do_identify     -       identify a drive
 110  *      @drive: drive to identify
 111  *      @cmd: command used
 112  *
 113  *      Called when we have issued a drive identify command to
 114  *      read and parse the results. This function is run with
 115  *      interrupts disabled.
 116  */
 117
 118 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 119 {
 120         ide_hwif_t *hwif = HWIF(drive);
 121         u16 *id = drive->id;
 122         char *m = (char *)&id[ATA_ID_PROD];
 123         int bswap = 1;
 124
 125         /* read 512 bytes of id info */
 126         hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 127
 128         drive->id_read = 1;
 129         local_irq_enable();
 130 #ifdef DEBUG
 131         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 132         ide_dump_identify((u8 *)id);
 133 #endif
 134         ide_fix_driveid(id);
 135
 136         /*
 137          *  WIN_IDENTIFY returns little-endian info,
 138          *  WIN_PIDENTIFY *usually* returns little-endian info.
 139          */
 140         if (cmd == WIN_PIDENTIFY) {
 141                 if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
 142                     (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
 143                     (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
 144                         /* Vertos drives may still be weird */
 145                         bswap ^= 1;
 146         }
 147
 148         ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
 149         ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
 150         ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
 151
 152         /* we depend on this a lot! */
 153         m[ATA_ID_PROD_LEN - 1] = '\0';
 154
 155         if (strstr(m, "E X A B Y T E N E S T"))
 156                 goto err_misc;
 157
 158         printk(KERN_INFO "%s: %s, ", drive->name, m);
 159
 160         drive->present = 1;
 161         drive->dead = 0;
 162
 163         /*
 164          * Check for an ATAPI device
 165          */
 166         if (cmd == WIN_PIDENTIFY) {
 167                 u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
 168
 169                 printk(KERN_CONT "ATAPI ");
 170                 switch (type) {
 171                         case ide_floppy:
 172                                 if (!strstr(m, "CD-ROM")) {
 173                                         if (!strstr(m, "oppy") &&
 174                                             !strstr(m, "poyp") &&
 175                                             !strstr(m, "ZIP"))
 176                                                 printk(KERN_CONT "cdrom or floppy?, assuming ");
 177                                         if (drive->media != ide_cdrom) {
 178                                                 printk(KERN_CONT "FLOPPY");
 179                                                 drive->removable = 1;
 180                                                 break;
 181                                         }
 182                                 }
 183                                 /* Early cdrom models used zero */
 184                                 type = ide_cdrom;
 185                         case ide_cdrom:
 186                                 drive->removable = 1;
 187 #ifdef CONFIG_PPC
 188                                 /* kludge for Apple PowerBook internal zip */
 189                                 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
 190                                         printk(KERN_CONT "FLOPPY");
 191                                         type = ide_floppy;
 192                                         break;
 193                                 }
 194 #endif
 195                                 printk(KERN_CONT "CD/DVD-ROM");
 196                                 break;
 197                         case ide_tape:
 198                                 printk(KERN_CONT "TAPE");
 199                                 break;
 200                         case ide_optical:
 201                                 printk(KERN_CONT "OPTICAL");
 202                                 drive->removable = 1;
 203                                 break;
 204                         default:
 205                                 printk(KERN_CONT "UNKNOWN (type %d)", type);
 206                                 break;
 207                 }
 208                 printk(KERN_CONT " drive\n");
 209                 drive->media = type;
 210                 /* an ATAPI device ignores DRDY */
 211                 drive->ready_stat = 0;
 212                 return;
 213         }
 214
 215         /*
 216          * Not an ATAPI device: looks like a "regular" hard disk
 217          */
 218
 219         /*
 220          * 0x848a = CompactFlash device
 221          * These are *not* removable in Linux definition of the term
 222          */
 223         if (id[ATA_ID_CONFIG] != 0x848a && (id[ATA_ID_CONFIG] & (1 << 7)))
 224                 drive->removable = 1;
 225
 226         drive->media = ide_disk;
 227
 228         printk(KERN_CONT "%s DISK drive\n",
 229                 (id[ATA_ID_CONFIG] == 0x848a) ? "CFA" : "ATA");
 230
 231         return;
 232
 233 err_misc:
 234         kfree(id);
 235         drive->present = 0;
 236         return;
 237 }
 238
 239 /**
 240  *      actual_try_to_identify  -       send ata/atapi identify
 241  *      @drive: drive to identify
 242  *      @cmd: command to use
 243  *
 244  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 245  *      and waits for a response.  It also monitors irqs while this is
 246  *      happening, in hope of automatically determining which one is
 247  *      being used by the interface.
 248  *
 249  *      Returns:        0  device was identified
 250  *                      1  device timed-out (no response to identify request)
 251  *                      2  device aborted the command (refused to identify itself)
 252  */
 253
 254 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 255 {
 256         ide_hwif_t *hwif = HWIF(drive);
 257         struct ide_io_ports *io_ports = &hwif->io_ports;
 258         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 259         int use_altstatus = 0, rc;
 260         unsigned long timeout;
 261         u8 s = 0, a = 0;
 262
 263         /* take a deep breath */
 264         msleep(50);
 265
 266         if (io_ports->ctl_addr) {
 267                 a = tp_ops->read_altstatus(hwif);
 268                 s = tp_ops->read_status(hwif);
 269                 if ((a ^ s) & ~INDEX_STAT)
 270                         /* ancient Seagate drives, broken interfaces */
 271                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 272                                          "instead of ALTSTATUS(0x%02x)\n",
 273                                          drive->name, s, a);
 274                 else
 275                         /* use non-intrusive polling */
 276                         use_altstatus = 1;
 277         }
 278
 279         /* set features register for atapi
 280          * identify command to be sure of reply
 281          */
 282         if (cmd == WIN_PIDENTIFY) {
 283                 ide_task_t task;
 284
 285                 memset(&task, 0, sizeof(task));
 286                 /* disable DMA & overlap */
 287                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 288
 289                 tp_ops->tf_load(drive, &task);
 290         }
 291
 292         /* ask drive for ID */
 293         tp_ops->exec_command(hwif, cmd);
 294
 295         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 296         timeout += jiffies;
 297         do {
 298                 if (time_after(jiffies, timeout)) {
 299                         /* drive timed-out */
 300                         return 1;
 301                 }
 302                 /* give drive a breather */
 303                 msleep(50);
 304                 s = use_altstatus ? tp_ops->read_altstatus(hwif)
 305                                   : tp_ops->read_status(hwif);
 306         } while (s & BUSY_STAT);
 307
 308         /* wait for IRQ and DRQ_STAT */
 309         msleep(50);
 310         s = tp_ops->read_status(hwif);
 311
 312         if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
 313                 unsigned long flags;
 314
 315                 /* local CPU only; some systems need this */
 316                 local_irq_save(flags);
 317                 /* drive returned ID */
 318                 do_identify(drive, cmd);
 319                 /* drive responded with ID */
 320                 rc = 0;
 321                 /* clear drive IRQ */
 322                 (void)tp_ops->read_status(hwif);
 323                 local_irq_restore(flags);
 324         } else {
 325                 /* drive refused ID */
 326                 rc = 2;
 327         }
 328         return rc;
 329 }
 330
 331 /**
 332  *      try_to_identify -       try to identify a drive
 333  *      @drive: drive to probe
 334  *      @cmd: command to use
 335  *
 336  *      Issue the identify command and then do IRQ probing to
 337  *      complete the identification when needed by finding the
 338  *      IRQ the drive is attached to
 339  */
 340
 341 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 342 {
 343         ide_hwif_t *hwif = HWIF(drive);
 344         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 345         int retval;
 346         int autoprobe = 0;
 347         unsigned long cookie = 0;
 348
 349         /*
 350          * Disable device irq unless we need to
 351          * probe for it. Otherwise we'll get spurious
 352          * interrupts during the identify-phase that
 353          * the irq handler isn't expecting.
 354          */
 355         if (hwif->io_ports.ctl_addr) {
 356                 if (!hwif->irq) {
 357                         autoprobe = 1;
 358                         cookie = probe_irq_on();
 359                 }
 360                 tp_ops->set_irq(hwif, autoprobe);
 361         }
 362
 363         retval = actual_try_to_identify(drive, cmd);
 364
 365         if (autoprobe) {
 366                 int irq;
 367
 368                 tp_ops->set_irq(hwif, 0);
 369                 /* clear drive IRQ */
 370                 (void)tp_ops->read_status(hwif);
 371                 udelay(5);
 372                 irq = probe_irq_off(cookie);
 373                 if (!hwif->irq) {
 374                         if (irq > 0) {
 375                                 hwif->irq = irq;
 376                         } else {
 377                                 /* Mmmm.. multiple IRQs..
 378                                  * don't know which was ours
 379                                  */
 380                                 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
 381                                         drive->name, cookie);
 382                         }
 383                 }
 384         }
 385         return retval;
 386 }
 387
 388 static int ide_busy_sleep(ide_hwif_t *hwif)
 389 {
 390         unsigned long timeout = jiffies + WAIT_WORSTCASE;
 391         u8 stat;
 392
 393         do {
 394                 msleep(50);
 395                 stat = hwif->tp_ops->read_status(hwif);
 396                 if ((stat & BUSY_STAT) == 0)
 397                         return 0;
 398         } while (time_before(jiffies, timeout));
 399
 400         return 1;
 401 }
 402
 403 static u8 ide_read_device(ide_drive_t *drive)
 404 {
 405         ide_task_t task;
 406
 407         memset(&task, 0, sizeof(task));
 408         task.tf_flags = IDE_TFLAG_IN_DEVICE;
 409
 410         drive->hwif->tp_ops->tf_read(drive, &task);
 411
 412         return task.tf.device;
 413 }
 414
 415 /**
 416  *      do_probe                -       probe an IDE device
 417  *      @drive: drive to probe
 418  *      @cmd: command to use
 419  *
 420  *      do_probe() has the difficult job of finding a drive if it exists,
 421  *      without getting hung up if it doesn't exist, without trampling on
 422  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 423  *
 424  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 425  *      but does not respond right away, the probe will "hang in there"
 426  *      for the maximum wait time (about 30 seconds), otherwise it will
 427  *      exit much more quickly.
 428  *
 429  * Returns:     0  device was identified
 430  *              1  device timed-out (no response to identify request)
 431  *              2  device aborted the command (refused to identify itself)
 432  *              3  bad status from device (possible for ATAPI drives)
 433  *              4  probe was not attempted because failure was obvious
 434  */
 435
 436 static int do_probe (ide_drive_t *drive, u8 cmd)
 437 {
 438         ide_hwif_t *hwif = HWIF(drive);
 439         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 440         int rc;
 441         u8 stat;
 442
 443         if (drive->present) {
 444                 /* avoid waiting for inappropriate probes */
 445                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 446                         return 4;
 447         }
 448 #ifdef DEBUG
 449         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 450                 drive->name, drive->present, drive->media,
 451                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 452 #endif
 453
 454         /* needed for some systems
 455          * (e.g. crw9624 as drive0 with disk as slave)
 456          */
 457         msleep(50);
 458         SELECT_DRIVE(drive);
 459         msleep(50);
 460
 461         if (ide_read_device(drive) != drive->select.all && !drive->present) {
 462                 if (drive->select.b.unit != 0) {
 463                         /* exit with drive0 selected */
 464                         SELECT_DRIVE(&hwif->drives[0]);
 465                         /* allow BUSY_STAT to assert & clear */
 466                         msleep(50);
 467                 }
 468                 /* no i/f present: mmm.. this should be a 4 -ml */
 469                 return 3;
 470         }
 471
 472         stat = tp_ops->read_status(hwif);
 473
 474         if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
 475             drive->present || cmd == WIN_PIDENTIFY) {
 476                 /* send cmd and wait */
 477                 if ((rc = try_to_identify(drive, cmd))) {
 478                         /* failed: try again */
 479                         rc = try_to_identify(drive,cmd);
 480                 }
 481
 482                 stat = tp_ops->read_status(hwif);
 483
 484                 if (stat == (BUSY_STAT | READY_STAT))
 485                         return 4;
 486
 487                 if (rc == 1 && cmd == WIN_PIDENTIFY) {
 488                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 489                                         "resetting drive\n", drive->name, stat);
 490                         msleep(50);
 491                         SELECT_DRIVE(drive);
 492                         msleep(50);
 493                         tp_ops->exec_command(hwif, WIN_SRST);
 494                         (void)ide_busy_sleep(hwif);
 495                         rc = try_to_identify(drive, cmd);
 496                 }
 497
 498                 /* ensure drive IRQ is clear */
 499                 stat = tp_ops->read_status(hwif);
 500
 501                 if (rc == 1)
 502                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 503                                         drive->name, stat);
 504         } else {
 505                 /* not present or maybe ATAPI */
 506                 rc = 3;
 507         }
 508         if (drive->select.b.unit != 0) {
 509                 /* exit with drive0 selected */
 510                 SELECT_DRIVE(&hwif->drives[0]);
 511                 msleep(50);
 512                 /* ensure drive irq is clear */
 513                 (void)tp_ops->read_status(hwif);
 514         }
 515         return rc;
 516 }
 517
 518 /*
 519  *
 520  */
 521 static void enable_nest (ide_drive_t *drive)
 522 {
 523         ide_hwif_t *hwif = HWIF(drive);
 524         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 525         u8 stat;
 526
 527         printk(KERN_INFO "%s: enabling %s -- ",
 528                 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
 529
 530         SELECT_DRIVE(drive);
 531         msleep(50);
 532         tp_ops->exec_command(hwif, EXABYTE_ENABLE_NEST);
 533
 534         if (ide_busy_sleep(hwif)) {
 535                 printk(KERN_CONT "failed (timeout)\n");
 536                 return;
 537         }
 538
 539         msleep(50);
 540
 541         stat = tp_ops->read_status(hwif);
 542
 543         if (!OK_STAT(stat, 0, BAD_STAT))
 544                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 545         else
 546                 printk(KERN_CONT "success\n");
 547
 548         /* if !(success||timed-out) */
 549         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 550                 /* look for ATAPI device */
 551                 (void) do_probe(drive, WIN_PIDENTIFY);
 552         }
 553 }
 554
 555 /**
 556  *      probe_for_drives        -       upper level drive probe
 557  *      @drive: drive to probe for
 558  *
 559  *      probe_for_drive() tests for existence of a given drive using do_probe()
 560  *      and presents things to the user as needed.
 561  *
 562  *      Returns:        0  no device was found
 563  *                      1  device was found (note: drive->present might
 564  *                         still be 0)
 565  */
 566
 567 static inline u8 probe_for_drive (ide_drive_t *drive)
 568 {
 569         char *m;
 570
 571         /*
 572          *      In order to keep things simple we have an id
 573          *      block for all drives at all times. If the device
 574          *      is pre ATA or refuses ATA/ATAPI identify we
 575          *      will add faked data to this.
 576          *
 577          *      Also note that 0 everywhere means "can't do X"
 578          */
 579
 580         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 581         drive->id_read = 0;
 582         if(drive->id == NULL)
 583         {
 584                 printk(KERN_ERR "ide: out of memory for id data.\n");
 585                 return 0;
 586         }
 587
 588         m = (char *)&drive->id[ATA_ID_PROD];
 589         strcpy(m, "UNKNOWN");
 590
 591         /* skip probing? */
 592         if (!drive->noprobe)
 593         {
 594                 /* if !(success||timed-out) */
 595                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 596                         /* look for ATAPI device */
 597                         (void) do_probe(drive, WIN_PIDENTIFY);
 598                 }
 599                 if (!drive->present)
 600                         /* drive not found */
 601                         return 0;
 602
 603                 if (strstr(m, "E X A B Y T E N E S T"))
 604                         enable_nest(drive);
 605
 606                 /* identification failed? */
 607                 if (!drive->id_read) {
 608                         if (drive->media == ide_disk) {
 609                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 610                                         drive->name, drive->cyl,
 611                                         drive->head, drive->sect);
 612                         } else if (drive->media == ide_cdrom) {
 613                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 614                         } else {
 615                                 /* nuke it */
 616                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 617                                 drive->present = 0;
 618                         }
 619                 }
 620                 /* drive was found */
 621         }
 622         if(!drive->present)
 623                 return 0;
 624         /* The drive wasn't being helpful. Add generic info only */
 625         if (drive->id_read == 0) {
 626                 generic_id(drive);
 627                 return 1;
 628         }
 629
 630         if (drive->media == ide_disk) {
 631                 ide_disk_init_chs(drive);
 632                 ide_disk_init_mult_count(drive);
 633         }
 634
 635         return drive->present;
 636 }
 637
 638 static void hwif_release_dev(struct device *dev)
 639 {
 640         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 641
 642         complete(&hwif->gendev_rel_comp);
 643 }
 644
 645 static int ide_register_port(ide_hwif_t *hwif)
 646 {
 647         int ret;
 648
 649         /* register with global device tree */
 650         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 651         hwif->gendev.driver_data = hwif;
 652         if (hwif->gendev.parent == NULL) {
 653                 if (hwif->dev)
 654                         hwif->gendev.parent = hwif->dev;
 655                 else
 656                         /* Would like to do = &device_legacy */
 657                         hwif->gendev.parent = NULL;
 658         }
 659         hwif->gendev.release = hwif_release_dev;
 660         ret = device_register(&hwif->gendev);
 661         if (ret < 0) {
 662                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 663                         __func__, ret);
 664                 goto out;
 665         }
 666
 667         hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
 668                                               MKDEV(0, 0), hwif, hwif->name);
 669         if (IS_ERR(hwif->portdev)) {
 670                 ret = PTR_ERR(hwif->portdev);
 671                 device_unregister(&hwif->gendev);
 672         }
 673 out:
 674         return ret;
 675 }
 676
 677 /**
 678  *      ide_port_wait_ready     -       wait for port to become ready
 679  *      @hwif: IDE port
 680  *
 681  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 682  *      platforms.  Typical cases are:
 683  *
 684  *      - The firmware hard reset the disk before booting the kernel,
 685  *        the drive is still doing it's poweron-reset sequence, that
 686  *        can take up to 30 seconds.
 687  *
 688  *      - The firmware does nothing (or no firmware), the device is
 689  *        still in POST state (same as above actually).
 690  *
 691  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 692  *        their reset sequence even when they are non-selected slave
 693  *        devices, thus preventing discovery of the main HD.
 694  *
 695  *      Doing this wait-for-non-busy should not harm any existing
 696  *      configuration and fix some issues like the above.
 697  *
 698  *      BenH.
 699  *
 700  *      Returns 0 on success, error code (< 0) otherwise.
 701  */
 702
 703 static int ide_port_wait_ready(ide_hwif_t *hwif)
 704 {
 705         int unit, rc;
 706
 707         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 708
 709         /* Let HW settle down a bit from whatever init state we
 710          * come from */
 711         mdelay(2);
 712
 713         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 714          * I know of at least one disk who takes 31 seconds, I use 35
 715          * here to be safe
 716          */
 717         rc = ide_wait_not_busy(hwif, 35000);
 718         if (rc)
 719                 return rc;
 720
 721         /* Now make sure both master & slave are ready */
 722         for (unit = 0; unit < MAX_DRIVES; unit++) {
 723                 ide_drive_t *drive = &hwif->drives[unit];
 724
 725                 /* Ignore disks that we will not probe for later. */
 726                 if (!drive->noprobe || drive->present) {
 727                         SELECT_DRIVE(drive);
 728                         hwif->tp_ops->set_irq(hwif, 1);
 729                         mdelay(2);
 730                         rc = ide_wait_not_busy(hwif, 35000);
 731                         if (rc)
 732                                 goto out;
 733                 } else
 734                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 735                                           drive->name);
 736         }
 737 out:
 738         /* Exit function with master reselected (let's be sane) */
 739         if (unit)
 740                 SELECT_DRIVE(&hwif->drives[0]);
 741
 742         return rc;
 743 }
 744
 745 /**
 746  *      ide_undecoded_slave     -       look for bad CF adapters
 747  *      @dev1: slave device
 748  *
 749  *      Analyse the drives on the interface and attempt to decide if we
 750  *      have the same drive viewed twice. This occurs with crap CF adapters
 751  *      and PCMCIA sometimes.
 752  */
 753
 754 void ide_undecoded_slave(ide_drive_t *dev1)
 755 {
 756         ide_drive_t *dev0 = &dev1->hwif->drives[0];
 757
 758         if ((dev1->dn & 1) == 0 || dev0->present == 0)
 759                 return;
 760
 761         /* If the models don't match they are not the same product */
 762         if (strcmp((char *)&dev0->id[ATA_ID_PROD],
 763                    (char *)&dev1->id[ATA_ID_PROD]))
 764                 return;
 765
 766         /* Serial numbers do not match */
 767         if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
 768                     (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
 769                 return;
 770
 771         /* No serial number, thankfully very rare for CF */
 772         if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
 773                 return;
 774
 775         /* Appears to be an IDE flash adapter with decode bugs */
 776         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 777
 778         dev1->present = 0;
 779 }
 780
 781 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 782
 783 static int ide_probe_port(ide_hwif_t *hwif)
 784 {
 785         unsigned long flags;
 786         unsigned int irqd;
 787         int unit, rc = -ENODEV;
 788
 789         BUG_ON(hwif->present);
 790
 791         if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
 792                 return -EACCES;
 793
 794         /*
 795          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 796          * we'll install our IRQ driver much later...
 797          */
 798         irqd = hwif->irq;
 799         if (irqd)
 800                 disable_irq(hwif->irq);
 801
 802         local_irq_set(flags);
 803
 804         if (ide_port_wait_ready(hwif) == -EBUSY)
 805                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 806
 807         /*
 808          * Second drive should only exist if first drive was found,
 809          * but a lot of cdrom drives are configured as single slaves.
 810          */
 811         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 812                 ide_drive_t *drive = &hwif->drives[unit];
 813                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 814                 (void) probe_for_drive(drive);
 815                 if (drive->present)
 816                         rc = 0;
 817         }
 818
 819         local_irq_restore(flags);
 820
 821         /*
 822          * Use cached IRQ number. It might be (and is...) changed by probe
 823          * code above
 824          */
 825         if (irqd)
 826                 enable_irq(irqd);
 827
 828         return rc;
 829 }
 830
 831 static void ide_port_tune_devices(ide_hwif_t *hwif)
 832 {
 833         const struct ide_port_ops *port_ops = hwif->port_ops;
 834         int unit;
 835
 836         for (unit = 0; unit < MAX_DRIVES; unit++) {
 837                 ide_drive_t *drive = &hwif->drives[unit];
 838
 839                 if (drive->present && port_ops && port_ops->quirkproc)
 840                         port_ops->quirkproc(drive);
 841         }
 842
 843         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 844                 ide_drive_t *drive = &hwif->drives[unit];
 845
 846                 if (drive->present) {
 847                         ide_set_max_pio(drive);
 848
 849                         drive->nice1 = 1;
 850
 851                         if (hwif->dma_ops)
 852                                 ide_set_dma(drive);
 853                 }
 854         }
 855
 856         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 857                 ide_drive_t *drive = &hwif->drives[unit];
 858
 859                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
 860                         drive->no_io_32bit = 1;
 861                 else
 862                         drive->no_io_32bit = drive->id[ATA_ID_DWORD_IO] ? 1 : 0;
 863         }
 864 }
 865
 866 #if MAX_HWIFS > 1
 867 /*
 868  * save_match() is used to simplify logic in init_irq() below.
 869  *
 870  * A loophole here is that we may not know about a particular
 871  * hwif's irq until after that hwif is actually probed/initialized..
 872  * This could be a problem for the case where an hwif is on a
 873  * dual interface that requires serialization (eg. cmd640) and another
 874  * hwif using one of the same irqs is initialized beforehand.
 875  *
 876  * This routine detects and reports such situations, but does not fix them.
 877  */
 878 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 879 {
 880         ide_hwif_t *m = *match;
 881
 882         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 883                 if (!new->hwgroup)
 884                         return;
 885                 printk(KERN_WARNING "%s: potential IRQ problem with %s and %s\n",
 886                         hwif->name, new->name, m->name);
 887         }
 888         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 889                 *match = new;
 890 }
 891 #endif /* MAX_HWIFS > 1 */
 892
 893 /*
 894  * init request queue
 895  */
 896 static int ide_init_queue(ide_drive_t *drive)
 897 {
 898         struct request_queue *q;
 899         ide_hwif_t *hwif = HWIF(drive);
 900         int max_sectors = 256;
 901         int max_sg_entries = PRD_ENTRIES;
 902
 903         /*
 904          *      Our default set up assumes the normal IDE case,
 905          *      that is 64K segmenting, standard PRD setup
 906          *      and LBA28. Some drivers then impose their own
 907          *      limits and LBA48 we could raise it but as yet
 908          *      do not.
 909          */
 910
 911         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 912         if (!q)
 913                 return 1;
 914
 915         q->queuedata = drive;
 916         blk_queue_segment_boundary(q, 0xffff);
 917
 918         if (hwif->rqsize < max_sectors)
 919                 max_sectors = hwif->rqsize;
 920         blk_queue_max_sectors(q, max_sectors);
 921
 922 #ifdef CONFIG_PCI
 923         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 924          * creates segments that don't completely match our boundary
 925          * requirements and thus need to be broken up again. Because it
 926          * doesn't align properly either, we may actually have to break up
 927          * to more segments than what was we got in the first place, a max
 928          * worst case is twice as many.
 929          * This will be fixed once we teach pci_map_sg() about our boundary
 930          * requirements, hopefully soon. *FIXME*
 931          */
 932         if (!PCI_DMA_BUS_IS_PHYS)
 933                 max_sg_entries >>= 1;
 934 #endif /* CONFIG_PCI */
 935
 936         blk_queue_max_hw_segments(q, max_sg_entries);
 937         blk_queue_max_phys_segments(q, max_sg_entries);
 938
 939         /* assign drive queue */
 940         drive->queue = q;
 941
 942         /* needs drive->queue to be set */
 943         ide_toggle_bounce(drive, 1);
 944
 945         return 0;
 946 }
 947
 948 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 949 {
 950         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 951
 952         spin_lock_irq(&ide_lock);
 953         if (!hwgroup->drive) {
 954                 /* first drive for hwgroup. */
 955                 drive->next = drive;
 956                 hwgroup->drive = drive;
 957                 hwgroup->hwif = HWIF(hwgroup->drive);
 958         } else {
 959                 drive->next = hwgroup->drive->next;
 960                 hwgroup->drive->next = drive;
 961         }
 962         spin_unlock_irq(&ide_lock);
 963 }
 964
 965 /*
 966  * For any present drive:
 967  * - allocate the block device queue
 968  * - link drive into the hwgroup
 969  */
 970 static void ide_port_setup_devices(ide_hwif_t *hwif)
 971 {
 972         int i;
 973
 974         mutex_lock(&ide_cfg_mtx);
 975         for (i = 0; i < MAX_DRIVES; i++) {
 976                 ide_drive_t *drive = &hwif->drives[i];
 977
 978                 if (!drive->present)
 979                         continue;
 980
 981                 if (ide_init_queue(drive)) {
 982                         printk(KERN_ERR "ide: failed to init %s\n",
 983                                         drive->name);
 984                         continue;
 985                 }
 986
 987                 ide_add_drive_to_hwgroup(drive);
 988         }
 989         mutex_unlock(&ide_cfg_mtx);
 990 }
 991
 992 static ide_hwif_t *ide_ports[MAX_HWIFS];
 993
 994 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 995 {
 996         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 997
 998         ide_ports[hwif->index] = NULL;
 999
1000         spin_lock_irq(&ide_lock);
1001         /*
1002          * Remove us from the hwgroup, and free
1003          * the hwgroup if we were the only member
1004          */
1005         if (hwif->next == hwif) {
1006                 BUG_ON(hwgroup->hwif != hwif);
1007                 kfree(hwgroup);
1008         } else {
1009                 /* There is another interface in hwgroup.
1010                  * Unlink us, and set hwgroup->drive and ->hwif to
1011                  * something sane.
1012                  */
1013                 ide_hwif_t *g = hwgroup->hwif;
1014
1015                 while (g->next != hwif)
1016                         g = g->next;
1017                 g->next = hwif->next;
1018                 if (hwgroup->hwif == hwif) {
1019                         /* Chose a random hwif for hwgroup->hwif.
1020                          * It's guaranteed that there are no drives
1021                          * left in the hwgroup.
1022                          */
1023                         BUG_ON(hwgroup->drive != NULL);
1024                         hwgroup->hwif = g;
1025                 }
1026                 BUG_ON(hwgroup->hwif == hwif);
1027         }
1028         spin_unlock_irq(&ide_lock);
1029 }
1030
1031 /*
1032  * This routine sets up the irq for an ide interface, and creates a new
1033  * hwgroup for the irq/hwif if none was previously assigned.
1034  *
1035  * Much of the code is for correctly detecting/handling irq sharing
1036  * and irq serialization situations.  This is somewhat complex because
1037  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1038  */
1039 static int init_irq (ide_hwif_t *hwif)
1040 {
1041         struct ide_io_ports *io_ports = &hwif->io_ports;
1042         unsigned int index;
1043         ide_hwgroup_t *hwgroup;
1044         ide_hwif_t *match = NULL;
1045
1046
1047         BUG_ON(in_interrupt());
1048         BUG_ON(irqs_disabled());
1049         BUG_ON(hwif == NULL);
1050
1051         mutex_lock(&ide_cfg_mtx);
1052         hwif->hwgroup = NULL;
1053 #if MAX_HWIFS > 1
1054         /*
1055          * Group up with any other hwifs that share our irq(s).
1056          */
1057         for (index = 0; index < MAX_HWIFS; index++) {
1058                 ide_hwif_t *h = ide_ports[index];
1059
1060                 if (h && h->hwgroup) {  /* scan only initialized ports */
1061                         if (hwif->irq == h->irq) {
1062                                 hwif->sharing_irq = h->sharing_irq = 1;
1063                                 if (hwif->chipset != ide_pci ||
1064                                     h->chipset != ide_pci) {
1065                                         save_match(hwif, h, &match);
1066                                 }
1067                         }
1068                         if (hwif->serialized) {
1069                                 if (hwif->mate && hwif->mate->irq == h->irq)
1070                                         save_match(hwif, h, &match);
1071                         }
1072                         if (h->serialized) {
1073                                 if (h->mate && hwif->irq == h->mate->irq)
1074                                         save_match(hwif, h, &match);
1075                         }
1076                 }
1077         }
1078 #endif /* MAX_HWIFS > 1 */
1079         /*
1080          * If we are still without a hwgroup, then form a new one
1081          */
1082         if (match) {
1083                 hwgroup = match->hwgroup;
1084                 hwif->hwgroup = hwgroup;
1085                 /*
1086                  * Link us into the hwgroup.
1087                  * This must be done early, do ensure that unexpected_intr
1088                  * can find the hwif and prevent irq storms.
1089                  * No drives are attached to the new hwif, choose_drive
1090                  * can't do anything stupid (yet).
1091                  * Add ourself as the 2nd entry to the hwgroup->hwif
1092                  * linked list, the first entry is the hwif that owns
1093                  * hwgroup->handler - do not change that.
1094                  */
1095                 spin_lock_irq(&ide_lock);
1096                 hwif->next = hwgroup->hwif->next;
1097                 hwgroup->hwif->next = hwif;
1098                 BUG_ON(hwif->next == hwif);
1099                 spin_unlock_irq(&ide_lock);
1100         } else {
1101                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1102                                        hwif_to_node(hwif));
1103                 if (hwgroup == NULL)
1104                         goto out_up;
1105
1106                 hwif->hwgroup = hwgroup;
1107                 hwgroup->hwif = hwif->next = hwif;
1108
1109                 init_timer(&hwgroup->timer);
1110                 hwgroup->timer.function = &ide_timer_expiry;
1111                 hwgroup->timer.data = (unsigned long) hwgroup;
1112         }
1113
1114         ide_ports[hwif->index] = hwif;
1115
1116         /*
1117          * Allocate the irq, if not already obtained for another hwif
1118          */
1119         if (!match || match->irq != hwif->irq) {
1120                 int sa = 0;
1121 #if defined(__mc68000__)
1122                 sa = IRQF_SHARED;
1123 #endif /* __mc68000__ */
1124
1125                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
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         if (!drive->present)
1177                 return NULL;
1178
1179         if (drive->media == ide_disk)
1180                 request_module("ide-disk");
1181         if (drive->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->select.all >> 4) & 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->present = 0;
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->present)
1351                         continue;
1352
1353                 ide_add_generic_settings(drive);
1354
1355                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1356                 dev->parent = &hwif->gendev;
1357                 dev->bus = &ide_bus_type;
1358                 dev->driver_data = drive;
1359                 dev->release = drive_release_dev;
1360
1361                 ret = device_register(dev);
1362                 if (ret < 0)
1363                         printk(KERN_WARNING "IDE: %s: device_register error: "
1364                                             "%d\n", __func__, ret);
1365         }
1366 }
1367
1368 static void ide_port_init_devices(ide_hwif_t *hwif)
1369 {
1370         const struct ide_port_ops *port_ops = hwif->port_ops;
1371         int i;
1372
1373         for (i = 0; i < MAX_DRIVES; i++) {
1374                 ide_drive_t *drive = &hwif->drives[i];
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->unmask = 1;
1380                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1381                         drive->no_unmask = 1;
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 (MAX_HWIFS == 1) {
1539                 if (ide_indexes == 0 && i == 0)
1540                         idx = 1;
1541         } else {
1542                 if (bootable) {
1543                         if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1544                                 idx = ffz(ide_indexes | i);
1545                 } else {
1546                         if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1547                                 idx = ffz(ide_indexes | 3);
1548                         else if ((ide_indexes & 3) != 3)
1549                                 idx = ffz(ide_indexes);
1550                 }
1551         }
1552         if (idx >= 0)
1553                 ide_indexes |= (1 << idx);
1554         mutex_unlock(&ide_cfg_mtx);
1555
1556         return idx;
1557 }
1558
1559 static void ide_free_port_slot(int idx)
1560 {
1561         mutex_lock(&ide_cfg_mtx);
1562         ide_indexes &= ~(1 << idx);
1563         mutex_unlock(&ide_cfg_mtx);
1564 }
1565
1566 struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
1567                                     hw_regs_t **hws)
1568 {
1569         struct ide_host *host;
1570         int i;
1571
1572         host = kzalloc(sizeof(*host), GFP_KERNEL);
1573         if (host == NULL)
1574                 return NULL;
1575
1576         for (i = 0; i < MAX_HWIFS; i++) {
1577                 ide_hwif_t *hwif;
1578                 int idx;
1579
1580                 if (hws[i] == NULL)
1581                         continue;
1582
1583                 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1584                 if (hwif == NULL)
1585                         continue;
1586
1587                 idx = ide_find_port_slot(d);
1588                 if (idx < 0) {
1589                         printk(KERN_ERR "%s: no free slot for interface\n",
1590                                         d ? d->name : "ide");
1591                         kfree(hwif);
1592                         continue;
1593                 }
1594
1595                 ide_init_port_data(hwif, idx);
1596
1597                 hwif->host = host;
1598
1599                 host->ports[i] = hwif;
1600                 host->n_ports++;
1601         }
1602
1603         if (host->n_ports == 0) {
1604                 kfree(host);
1605                 return NULL;
1606         }
1607
1608         if (hws[0])
1609                 host->dev[0] = hws[0]->dev;
1610
1611         if (d)
1612                 host->host_flags = d->host_flags;
1613
1614         return host;
1615 }
1616 EXPORT_SYMBOL_GPL(ide_host_alloc_all);
1617
1618 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1619 {
1620         hw_regs_t *hws_all[MAX_HWIFS];
1621         int i;
1622
1623         for (i = 0; i < MAX_HWIFS; i++)
1624                 hws_all[i] = (i < 4) ? hws[i] : NULL;
1625
1626         return ide_host_alloc_all(d, hws_all);
1627 }
1628 EXPORT_SYMBOL_GPL(ide_host_alloc);
1629
1630 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1631                       hw_regs_t **hws)
1632 {
1633         ide_hwif_t *hwif, *mate = NULL;
1634         int i, j = 0;
1635
1636         for (i = 0; i < MAX_HWIFS; i++) {
1637                 hwif = host->ports[i];
1638
1639                 if (hwif == NULL) {
1640                         mate = NULL;
1641                         continue;
1642                 }
1643
1644                 ide_init_port_hw(hwif, hws[i]);
1645                 ide_port_apply_params(hwif);
1646
1647                 if (d == NULL) {
1648                         mate = NULL;
1649                         continue;
1650                 }
1651
1652                 if ((i & 1) && mate) {
1653                         hwif->mate = mate;
1654                         mate->mate = hwif;
1655                 }
1656
1657                 mate = (i & 1) ? NULL : hwif;
1658
1659                 ide_init_port(hwif, i & 1, d);
1660                 ide_port_cable_detect(hwif);
1661                 ide_port_init_devices(hwif);
1662         }
1663
1664         for (i = 0; i < MAX_HWIFS; i++) {
1665                 hwif = host->ports[i];
1666
1667                 if (hwif == NULL)
1668                         continue;
1669
1670                 if (ide_probe_port(hwif) == 0)
1671                         hwif->present = 1;
1672
1673                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1674                     !hwif->mate->present)
1675                         ide_register_port(hwif);
1676
1677                 if (hwif->present)
1678                         ide_port_tune_devices(hwif);
1679         }
1680
1681         for (i = 0; i < MAX_HWIFS; i++) {
1682                 hwif = host->ports[i];
1683
1684                 if (hwif == NULL)
1685                         continue;
1686
1687                 if (hwif_init(hwif) == 0) {
1688                         printk(KERN_INFO "%s: failed to initialize IDE "
1689                                          "interface\n", hwif->name);
1690                         hwif->present = 0;
1691                         continue;
1692                 }
1693
1694                 j++;
1695
1696                 if (hwif->present)
1697                         ide_port_setup_devices(hwif);
1698
1699                 ide_acpi_init(hwif);
1700
1701                 if (hwif->present)
1702                         ide_acpi_port_init_devices(hwif);
1703         }
1704
1705         for (i = 0; i < MAX_HWIFS; i++) {
1706                 hwif = host->ports[i];
1707
1708                 if (hwif == NULL)
1709                         continue;
1710
1711                 if (hwif->chipset == ide_unknown)
1712                         hwif->chipset = ide_generic;
1713
1714                 if (hwif->present)
1715                         hwif_register_devices(hwif);
1716         }
1717
1718         for (i = 0; i < MAX_HWIFS; i++) {
1719                 hwif = host->ports[i];
1720
1721                 if (hwif == NULL)
1722                         continue;
1723
1724                 ide_sysfs_register_port(hwif);
1725                 ide_proc_register_port(hwif);
1726
1727                 if (hwif->present)
1728                         ide_proc_port_register_devices(hwif);
1729         }
1730
1731         return j ? 0 : -1;
1732 }
1733 EXPORT_SYMBOL_GPL(ide_host_register);
1734
1735 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1736                  struct ide_host **hostp)
1737 {
1738         struct ide_host *host;
1739         int rc;
1740
1741         host = ide_host_alloc(d, hws);
1742         if (host == NULL)
1743                 return -ENOMEM;
1744
1745         rc = ide_host_register(host, d, hws);
1746         if (rc) {
1747                 ide_host_free(host);
1748                 return rc;
1749         }
1750
1751         if (hostp)
1752                 *hostp = host;
1753
1754         return 0;
1755 }
1756 EXPORT_SYMBOL_GPL(ide_host_add);
1757
1758 void ide_host_free(struct ide_host *host)
1759 {
1760         ide_hwif_t *hwif;
1761         int i;
1762
1763         for (i = 0; i < MAX_HWIFS; i++) {
1764                 hwif = host->ports[i];
1765
1766                 if (hwif == NULL)
1767                         continue;
1768
1769                 ide_free_port_slot(hwif->index);
1770                 kfree(hwif);
1771         }
1772
1773         kfree(host);
1774 }
1775 EXPORT_SYMBOL_GPL(ide_host_free);
1776
1777 void ide_host_remove(struct ide_host *host)
1778 {
1779         int i;
1780
1781         for (i = 0; i < MAX_HWIFS; i++) {
1782                 if (host->ports[i])
1783                         ide_unregister(host->ports[i]);
1784         }
1785
1786         ide_host_free(host);
1787 }
1788 EXPORT_SYMBOL_GPL(ide_host_remove);
1789
1790 void ide_port_scan(ide_hwif_t *hwif)
1791 {
1792         ide_port_apply_params(hwif);
1793         ide_port_cable_detect(hwif);
1794         ide_port_init_devices(hwif);
1795
1796         if (ide_probe_port(hwif) < 0)
1797                 return;
1798
1799         hwif->present = 1;
1800
1801         ide_port_tune_devices(hwif);
1802         ide_acpi_port_init_devices(hwif);
1803         ide_port_setup_devices(hwif);
1804         hwif_register_devices(hwif);
1805         ide_proc_port_register_devices(hwif);
1806 }
1807 EXPORT_SYMBOL_GPL(ide_port_scan);
1808
1809 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1810                                 u8 port_no, const struct ide_port_info *d,
1811                                 unsigned long config)
1812 {
1813         unsigned long base, ctl;
1814         int irq;
1815
1816         if (port_no == 0) {
1817                 base = 0x1f0;
1818                 ctl  = 0x3f6;
1819                 irq  = 14;
1820         } else {
1821                 base = 0x170;
1822                 ctl  = 0x376;
1823                 irq  = 15;
1824         }
1825
1826         if (!request_region(base, 8, d->name)) {
1827                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1828                                 d->name, base, base + 7);
1829                 return;
1830         }
1831
1832         if (!request_region(ctl, 1, d->name)) {
1833                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1834                                 d->name, ctl);
1835                 release_region(base, 8);
1836                 return;
1837         }
1838
1839         ide_std_init_ports(hw, base, ctl);
1840         hw->irq = irq;
1841         hw->chipset = d->chipset;
1842         hw->config = config;
1843
1844         hws[port_no] = hw;
1845 }
1846
1847 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1848 {
1849         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1850
1851         memset(&hw, 0, sizeof(hw));
1852
1853         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1854                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1855         ide_legacy_init_one(hws, &hw[1], 1, d, config);
1856
1857         if (hws[0] == NULL && hws[1] == NULL &&
1858             (d->host_flags & IDE_HFLAG_SINGLE))
1859                 return -ENOENT;
1860
1861         return ide_host_add(d, hws, NULL);
1862 }
1863 EXPORT_SYMBOL_GPL(ide_legacy_device_add);