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

   1 /*
   2  *  Copyright (C) 1994-1998   Linus Torvalds & authors (see below)
   3  *  Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  *  Mostly written by Mark Lord <mlord@pobox.com>
   8  *                and Gadi Oxman <gadio@netvision.net.il>
   9  *                and Andre Hedrick <andre@linux-ide.org>
  10  *
  11  *  See linux/MAINTAINERS for address of current maintainer.
  12  *
  13  * This is the IDE probe module, as evolved from hd.c and ide.c.
  14  *
  15  * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  16  *       by Andrea Arcangeli
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22 #include <linux/kernel.h>
  23 #include <linux/timer.h>
  24 #include <linux/mm.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/major.h>
  27 #include <linux/errno.h>
  28 #include <linux/genhd.h>
  29 #include <linux/slab.h>
  30 #include <linux/delay.h>
  31 #include <linux/ide.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/kmod.h>
  34 #include <linux/pci.h>
  35 #include <linux/scatterlist.h>
  36
  37 #include <asm/byteorder.h>
  38 #include <asm/irq.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/io.h>
  41
  42 /**
  43  *      generic_id              -       add a generic drive id
  44  *      @drive: drive to make an ID block for
  45  *
  46  *      Add a fake id field to the drive we are passed. This allows
  47  *      use to skip a ton of NULL checks (which people always miss)
  48  *      and make drive properties unconditional outside of this file
  49  */
  50
  51 static void generic_id(ide_drive_t *drive)
  52 {
  53         drive->id->cyls = drive->cyl;
  54         drive->id->heads = drive->head;
  55         drive->id->sectors = drive->sect;
  56         drive->id->cur_cyls = drive->cyl;
  57         drive->id->cur_heads = drive->head;
  58         drive->id->cur_sectors = drive->sect;
  59 }
  60
  61 static void ide_disk_init_chs(ide_drive_t *drive)
  62 {
  63         struct hd_driveid *id = drive->id;
  64
  65         /* Extract geometry if we did not already have one for the drive */
  66         if (!drive->cyl || !drive->head || !drive->sect) {
  67                 drive->cyl  = drive->bios_cyl  = id->cyls;
  68                 drive->head = drive->bios_head = id->heads;
  69                 drive->sect = drive->bios_sect = id->sectors;
  70         }
  71
  72         /* Handle logical geometry translation by the drive */
  73         if ((id->field_valid & 1) && id->cur_cyls &&
  74             id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
  75                 drive->cyl  = id->cur_cyls;
  76                 drive->head = id->cur_heads;
  77                 drive->sect = id->cur_sectors;
  78         }
  79
  80         /* Use physical geometry if what we have still makes no sense */
  81         if (drive->head > 16 && id->heads && id->heads <= 16) {
  82                 drive->cyl  = id->cyls;
  83                 drive->head = id->heads;
  84                 drive->sect = id->sectors;
  85         }
  86 }
  87
  88 static void ide_disk_init_mult_count(ide_drive_t *drive)
  89 {
  90         struct hd_driveid *id = drive->id;
  91
  92         drive->mult_count = 0;
  93         if (id->max_multsect) {
  94 #ifdef CONFIG_IDEDISK_MULTI_MODE
  95                 id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
  96                 id->multsect_valid = id->multsect ? 1 : 0;
  97                 drive->mult_req = id->multsect_valid ? id->max_multsect : 0;
  98                 drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
  99 #else   /* original, pre IDE-NFG, per request of AC */
 100                 drive->mult_req = 0;
 101                 if (drive->mult_req > id->max_multsect)
 102                         drive->mult_req = id->max_multsect;
 103                 if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
 104                         drive->special.b.set_multmode = 1;
 105 #endif
 106         }
 107 }
 108
 109 /**
 110  *      do_identify     -       identify a drive
 111  *      @drive: drive to identify
 112  *      @cmd: command used
 113  *
 114  *      Called when we have issued a drive identify command to
 115  *      read and parse the results. This function is run with
 116  *      interrupts disabled.
 117  */
 118
 119 static inline void do_identify (ide_drive_t *drive, u8 cmd)
 120 {
 121         ide_hwif_t *hwif = HWIF(drive);
 122         int bswap = 1;
 123         struct hd_driveid *id;
 124
 125         id = drive->id;
 126         /* read 512 bytes of id info */
 127         hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 128
 129         drive->id_read = 1;
 130         local_irq_enable();
 131 #ifdef DEBUG
 132         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 133         ide_dump_identify((u8 *)id);
 134 #endif
 135         ide_fix_driveid(id);
 136
 137 #if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 138         /*
 139          * EATA SCSI controllers do a hardware ATA emulation:
 140          * Ignore them if there is a driver for them available.
 141          */
 142         if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 143             (id->model[0] == 'S' && id->model[1] == 'K')) {
 144                 printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 145                 goto err_misc;
 146         }
 147 #endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
 148
 149         /*
 150          *  WIN_IDENTIFY returns little-endian info,
 151          *  WIN_PIDENTIFY *usually* returns little-endian info.
 152          */
 153         if (cmd == WIN_PIDENTIFY) {
 154                 if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 155                  || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 156                  || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 157                         /* Vertos drives may still be weird */
 158                         bswap ^= 1;
 159         }
 160         ide_fixstring(id->model,     sizeof(id->model),     bswap);
 161         ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 162         ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 163
 164         /* we depend on this a lot! */
 165         id->model[sizeof(id->model)-1] = '\0';
 166
 167         if (strstr(id->model, "E X A B Y T E N E S T"))
 168                 goto err_misc;
 169
 170         printk("%s: %s, ", drive->name, id->model);
 171         drive->present = 1;
 172         drive->dead = 0;
 173
 174         /*
 175          * Check for an ATAPI device
 176          */
 177         if (cmd == WIN_PIDENTIFY) {
 178                 u8 type = (id->config >> 8) & 0x1f;
 179                 printk("ATAPI ");
 180                 switch (type) {
 181                         case ide_floppy:
 182                                 if (!strstr(id->model, "CD-ROM")) {
 183                                         if (!strstr(id->model, "oppy") &&
 184                                             !strstr(id->model, "poyp") &&
 185                                             !strstr(id->model, "ZIP"))
 186                                                 printk("cdrom or floppy?, assuming ");
 187                                         if (drive->media != ide_cdrom) {
 188                                                 printk ("FLOPPY");
 189                                                 drive->removable = 1;
 190                                                 break;
 191                                         }
 192                                 }
 193                                 /* Early cdrom models used zero */
 194                                 type = ide_cdrom;
 195                         case ide_cdrom:
 196                                 drive->removable = 1;
 197 #ifdef CONFIG_PPC
 198                                 /* kludge for Apple PowerBook internal zip */
 199                                 if (!strstr(id->model, "CD-ROM") &&
 200                                     strstr(id->model, "ZIP")) {
 201                                         printk ("FLOPPY");
 202                                         type = ide_floppy;
 203                                         break;
 204                                 }
 205 #endif
 206                                 printk ("CD/DVD-ROM");
 207                                 break;
 208                         case ide_tape:
 209                                 printk ("TAPE");
 210                                 break;
 211                         case ide_optical:
 212                                 printk ("OPTICAL");
 213                                 drive->removable = 1;
 214                                 break;
 215                         default:
 216                                 printk("UNKNOWN (type %d)", type);
 217                                 break;
 218                 }
 219                 printk (" drive\n");
 220                 drive->media = type;
 221                 /* an ATAPI device ignores DRDY */
 222                 drive->ready_stat = 0;
 223                 return;
 224         }
 225
 226         /*
 227          * Not an ATAPI device: looks like a "regular" hard disk
 228          */
 229
 230         /*
 231          * 0x848a = CompactFlash device
 232          * These are *not* removable in Linux definition of the term
 233          */
 234
 235         if ((id->config != 0x848a) && (id->config & (1<<7)))
 236                 drive->removable = 1;
 237
 238         drive->media = ide_disk;
 239         printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
 240
 241         return;
 242
 243 err_misc:
 244         kfree(id);
 245         drive->present = 0;
 246         return;
 247 }
 248
 249 /**
 250  *      actual_try_to_identify  -       send ata/atapi identify
 251  *      @drive: drive to identify
 252  *      @cmd: command to use
 253  *
 254  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 255  *      and waits for a response.  It also monitors irqs while this is
 256  *      happening, in hope of automatically determining which one is
 257  *      being used by the interface.
 258  *
 259  *      Returns:        0  device was identified
 260  *                      1  device timed-out (no response to identify request)
 261  *                      2  device aborted the command (refused to identify itself)
 262  */
 263
 264 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 265 {
 266         ide_hwif_t *hwif = HWIF(drive);
 267         struct ide_io_ports *io_ports = &hwif->io_ports;
 268         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 269         int use_altstatus = 0, rc;
 270         unsigned long timeout;
 271         u8 s = 0, a = 0;
 272
 273         /* take a deep breath */
 274         msleep(50);
 275
 276         if (io_ports->ctl_addr) {
 277                 a = tp_ops->read_altstatus(hwif);
 278                 s = tp_ops->read_status(hwif);
 279                 if ((a ^ s) & ~INDEX_STAT)
 280                         /* ancient Seagate drives, broken interfaces */
 281                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 282                                          "instead of ALTSTATUS(0x%02x)\n",
 283                                          drive->name, s, a);
 284                 else
 285                         /* use non-intrusive polling */
 286                         use_altstatus = 1;
 287         }
 288
 289         /* set features register for atapi
 290          * identify command to be sure of reply
 291          */
 292         if (cmd == WIN_PIDENTIFY) {
 293                 ide_task_t task;
 294
 295                 memset(&task, 0, sizeof(task));
 296                 /* disable DMA & overlap */
 297                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 298
 299                 tp_ops->tf_load(drive, &task);
 300         }
 301
 302         /* ask drive for ID */
 303         tp_ops->exec_command(hwif, cmd);
 304
 305         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 306         timeout += jiffies;
 307         do {
 308                 if (time_after(jiffies, timeout)) {
 309                         /* drive timed-out */
 310                         return 1;
 311                 }
 312                 /* give drive a breather */
 313                 msleep(50);
 314                 s = use_altstatus ? tp_ops->read_altstatus(hwif)
 315                                   : tp_ops->read_status(hwif);
 316         } while (s & BUSY_STAT);
 317
 318         /* wait for IRQ and DRQ_STAT */
 319         msleep(50);
 320         s = tp_ops->read_status(hwif);
 321
 322         if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
 323                 unsigned long flags;
 324
 325                 /* local CPU only; some systems need this */
 326                 local_irq_save(flags);
 327                 /* drive returned ID */
 328                 do_identify(drive, cmd);
 329                 /* drive responded with ID */
 330                 rc = 0;
 331                 /* clear drive IRQ */
 332                 (void)tp_ops->read_status(hwif);
 333                 local_irq_restore(flags);
 334         } else {
 335                 /* drive refused ID */
 336                 rc = 2;
 337         }
 338         return rc;
 339 }
 340
 341 /**
 342  *      try_to_identify -       try to identify a drive
 343  *      @drive: drive to probe
 344  *      @cmd: command to use
 345  *
 346  *      Issue the identify command and then do IRQ probing to
 347  *      complete the identification when needed by finding the
 348  *      IRQ the drive is attached to
 349  */
 350
 351 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 352 {
 353         ide_hwif_t *hwif = HWIF(drive);
 354         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 355         int retval;
 356         int autoprobe = 0;
 357         unsigned long cookie = 0;
 358
 359         /*
 360          * Disable device irq unless we need to
 361          * probe for it. Otherwise we'll get spurious
 362          * interrupts during the identify-phase that
 363          * the irq handler isn't expecting.
 364          */
 365         if (hwif->io_ports.ctl_addr) {
 366                 if (!hwif->irq) {
 367                         autoprobe = 1;
 368                         cookie = probe_irq_on();
 369                 }
 370                 tp_ops->set_irq(hwif, autoprobe);
 371         }
 372
 373         retval = actual_try_to_identify(drive, cmd);
 374
 375         if (autoprobe) {
 376                 int irq;
 377
 378                 tp_ops->set_irq(hwif, 0);
 379                 /* clear drive IRQ */
 380                 (void)tp_ops->read_status(hwif);
 381                 udelay(5);
 382                 irq = probe_irq_off(cookie);
 383                 if (!hwif->irq) {
 384                         if (irq > 0) {
 385                                 hwif->irq = irq;
 386                         } else {
 387                                 /* Mmmm.. multiple IRQs..
 388                                  * don't know which was ours
 389                                  */
 390                                 printk("%s: IRQ probe failed (0x%lx)\n",
 391                                         drive->name, cookie);
 392                         }
 393                 }
 394         }
 395         return retval;
 396 }
 397
 398 static int ide_busy_sleep(ide_hwif_t *hwif)
 399 {
 400         unsigned long timeout = jiffies + WAIT_WORSTCASE;
 401         u8 stat;
 402
 403         do {
 404                 msleep(50);
 405                 stat = hwif->tp_ops->read_status(hwif);
 406                 if ((stat & BUSY_STAT) == 0)
 407                         return 0;
 408         } while (time_before(jiffies, timeout));
 409
 410         return 1;
 411 }
 412
 413 static u8 ide_read_device(ide_drive_t *drive)
 414 {
 415         ide_task_t task;
 416
 417         memset(&task, 0, sizeof(task));
 418         task.tf_flags = IDE_TFLAG_IN_DEVICE;
 419
 420         drive->hwif->tp_ops->tf_read(drive, &task);
 421
 422         return task.tf.device;
 423 }
 424
 425 /**
 426  *      do_probe                -       probe an IDE device
 427  *      @drive: drive to probe
 428  *      @cmd: command to use
 429  *
 430  *      do_probe() has the difficult job of finding a drive if it exists,
 431  *      without getting hung up if it doesn't exist, without trampling on
 432  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 433  *
 434  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 435  *      but does not respond right away, the probe will "hang in there"
 436  *      for the maximum wait time (about 30 seconds), otherwise it will
 437  *      exit much more quickly.
 438  *
 439  * Returns:     0  device was identified
 440  *              1  device timed-out (no response to identify request)
 441  *              2  device aborted the command (refused to identify itself)
 442  *              3  bad status from device (possible for ATAPI drives)
 443  *              4  probe was not attempted because failure was obvious
 444  */
 445
 446 static int do_probe (ide_drive_t *drive, u8 cmd)
 447 {
 448         ide_hwif_t *hwif = HWIF(drive);
 449         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 450         int rc;
 451         u8 stat;
 452
 453         if (drive->present) {
 454                 /* avoid waiting for inappropriate probes */
 455                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 456                         return 4;
 457         }
 458 #ifdef DEBUG
 459         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 460                 drive->name, drive->present, drive->media,
 461                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 462 #endif
 463
 464         /* needed for some systems
 465          * (e.g. crw9624 as drive0 with disk as slave)
 466          */
 467         msleep(50);
 468         SELECT_DRIVE(drive);
 469         msleep(50);
 470
 471         if (ide_read_device(drive) != drive->select.all && !drive->present) {
 472                 if (drive->select.b.unit != 0) {
 473                         /* exit with drive0 selected */
 474                         SELECT_DRIVE(&hwif->drives[0]);
 475                         /* allow BUSY_STAT to assert & clear */
 476                         msleep(50);
 477                 }
 478                 /* no i/f present: mmm.. this should be a 4 -ml */
 479                 return 3;
 480         }
 481
 482         stat = tp_ops->read_status(hwif);
 483
 484         if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
 485             drive->present || cmd == WIN_PIDENTIFY) {
 486                 /* send cmd and wait */
 487                 if ((rc = try_to_identify(drive, cmd))) {
 488                         /* failed: try again */
 489                         rc = try_to_identify(drive,cmd);
 490                 }
 491
 492                 stat = tp_ops->read_status(hwif);
 493
 494                 if (stat == (BUSY_STAT | READY_STAT))
 495                         return 4;
 496
 497                 if (rc == 1 && cmd == WIN_PIDENTIFY) {
 498                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 499                                         "resetting drive\n", drive->name, stat);
 500                         msleep(50);
 501                         SELECT_DRIVE(drive);
 502                         msleep(50);
 503                         tp_ops->exec_command(hwif, WIN_SRST);
 504                         (void)ide_busy_sleep(hwif);
 505                         rc = try_to_identify(drive, cmd);
 506                 }
 507
 508                 /* ensure drive IRQ is clear */
 509                 stat = tp_ops->read_status(hwif);
 510
 511                 if (rc == 1)
 512                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 513                                         drive->name, stat);
 514         } else {
 515                 /* not present or maybe ATAPI */
 516                 rc = 3;
 517         }
 518         if (drive->select.b.unit != 0) {
 519                 /* exit with drive0 selected */
 520                 SELECT_DRIVE(&hwif->drives[0]);
 521                 msleep(50);
 522                 /* ensure drive irq is clear */
 523                 (void)tp_ops->read_status(hwif);
 524         }
 525         return rc;
 526 }
 527
 528 /*
 529  *
 530  */
 531 static void enable_nest (ide_drive_t *drive)
 532 {
 533         ide_hwif_t *hwif = HWIF(drive);
 534         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 535         u8 stat;
 536
 537         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 538         SELECT_DRIVE(drive);
 539         msleep(50);
 540         tp_ops->exec_command(hwif, EXABYTE_ENABLE_NEST);
 541
 542         if (ide_busy_sleep(hwif)) {
 543                 printk(KERN_CONT "failed (timeout)\n");
 544                 return;
 545         }
 546
 547         msleep(50);
 548
 549         stat = tp_ops->read_status(hwif);
 550
 551         if (!OK_STAT(stat, 0, BAD_STAT))
 552                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 553         else
 554                 printk(KERN_CONT "success\n");
 555
 556         /* if !(success||timed-out) */
 557         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 558                 /* look for ATAPI device */
 559                 (void) do_probe(drive, WIN_PIDENTIFY);
 560         }
 561 }
 562
 563 /**
 564  *      probe_for_drives        -       upper level drive probe
 565  *      @drive: drive to probe for
 566  *
 567  *      probe_for_drive() tests for existence of a given drive using do_probe()
 568  *      and presents things to the user as needed.
 569  *
 570  *      Returns:        0  no device was found
 571  *                      1  device was found (note: drive->present might
 572  *                         still be 0)
 573  */
 574
 575 static inline u8 probe_for_drive (ide_drive_t *drive)
 576 {
 577         /*
 578          *      In order to keep things simple we have an id
 579          *      block for all drives at all times. If the device
 580          *      is pre ATA or refuses ATA/ATAPI identify we
 581          *      will add faked data to this.
 582          *
 583          *      Also note that 0 everywhere means "can't do X"
 584          */
 585
 586         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 587         drive->id_read = 0;
 588         if(drive->id == NULL)
 589         {
 590                 printk(KERN_ERR "ide: out of memory for id data.\n");
 591                 return 0;
 592         }
 593         strcpy(drive->id->model, "UNKNOWN");
 594
 595         /* skip probing? */
 596         if (!drive->noprobe)
 597         {
 598                 /* if !(success||timed-out) */
 599                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 600                         /* look for ATAPI device */
 601                         (void) do_probe(drive, WIN_PIDENTIFY);
 602                 }
 603                 if (!drive->present)
 604                         /* drive not found */
 605                         return 0;
 606                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 607                         enable_nest(drive);
 608
 609                 /* identification failed? */
 610                 if (!drive->id_read) {
 611                         if (drive->media == ide_disk) {
 612                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 613                                         drive->name, drive->cyl,
 614                                         drive->head, drive->sect);
 615                         } else if (drive->media == ide_cdrom) {
 616                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 617                         } else {
 618                                 /* nuke it */
 619                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 620                                 drive->present = 0;
 621                         }
 622                 }
 623                 /* drive was found */
 624         }
 625         if(!drive->present)
 626                 return 0;
 627         /* The drive wasn't being helpful. Add generic info only */
 628         if (drive->id_read == 0) {
 629                 generic_id(drive);
 630                 return 1;
 631         }
 632
 633         if (drive->media == ide_disk) {
 634                 ide_disk_init_chs(drive);
 635                 ide_disk_init_mult_count(drive);
 636         }
 637
 638         return drive->present;
 639 }
 640
 641 static void hwif_release_dev(struct device *dev)
 642 {
 643         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 644
 645         complete(&hwif->gendev_rel_comp);
 646 }
 647
 648 static int ide_register_port(ide_hwif_t *hwif)
 649 {
 650         int ret;
 651
 652         /* register with global device tree */
 653         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 654         hwif->gendev.driver_data = hwif;
 655         if (hwif->gendev.parent == NULL) {
 656                 if (hwif->dev)
 657                         hwif->gendev.parent = hwif->dev;
 658                 else
 659                         /* Would like to do = &device_legacy */
 660                         hwif->gendev.parent = NULL;
 661         }
 662         hwif->gendev.release = hwif_release_dev;
 663         ret = device_register(&hwif->gendev);
 664         if (ret < 0) {
 665                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 666                         __func__, ret);
 667                 goto out;
 668         }
 669
 670         hwif->portdev = device_create_drvdata(ide_port_class, &hwif->gendev,
 671                                               MKDEV(0, 0), hwif, hwif->name);
 672         if (IS_ERR(hwif->portdev)) {
 673                 ret = PTR_ERR(hwif->portdev);
 674                 device_unregister(&hwif->gendev);
 675         }
 676 out:
 677         return ret;
 678 }
 679
 680 /**
 681  *      ide_port_wait_ready     -       wait for port to become ready
 682  *      @hwif: IDE port
 683  *
 684  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 685  *      platforms.  Typical cases are:
 686  *
 687  *      - The firmware hard reset the disk before booting the kernel,
 688  *        the drive is still doing it's poweron-reset sequence, that
 689  *        can take up to 30 seconds.
 690  *
 691  *      - The firmware does nothing (or no firmware), the device is
 692  *        still in POST state (same as above actually).
 693  *
 694  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 695  *        their reset sequence even when they are non-selected slave
 696  *        devices, thus preventing discovery of the main HD.
 697  *
 698  *      Doing this wait-for-non-busy should not harm any existing
 699  *      configuration and fix some issues like the above.
 700  *
 701  *      BenH.
 702  *
 703  *      Returns 0 on success, error code (< 0) otherwise.
 704  */
 705
 706 static int ide_port_wait_ready(ide_hwif_t *hwif)
 707 {
 708         int unit, rc;
 709
 710         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 711
 712         /* Let HW settle down a bit from whatever init state we
 713          * come from */
 714         mdelay(2);
 715
 716         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 717          * I know of at least one disk who takes 31 seconds, I use 35
 718          * here to be safe
 719          */
 720         rc = ide_wait_not_busy(hwif, 35000);
 721         if (rc)
 722                 return rc;
 723
 724         /* Now make sure both master & slave are ready */
 725         for (unit = 0; unit < MAX_DRIVES; unit++) {
 726                 ide_drive_t *drive = &hwif->drives[unit];
 727
 728                 /* Ignore disks that we will not probe for later. */
 729                 if (!drive->noprobe || drive->present) {
 730                         SELECT_DRIVE(drive);
 731                         hwif->tp_ops->set_irq(hwif, 1);
 732                         mdelay(2);
 733                         rc = ide_wait_not_busy(hwif, 35000);
 734                         if (rc)
 735                                 goto out;
 736                 } else
 737                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 738                                           drive->name);
 739         }
 740 out:
 741         /* Exit function with master reselected (let's be sane) */
 742         if (unit)
 743                 SELECT_DRIVE(&hwif->drives[0]);
 744
 745         return rc;
 746 }
 747
 748 /**
 749  *      ide_undecoded_slave     -       look for bad CF adapters
 750  *      @drive1: drive
 751  *
 752  *      Analyse the drives on the interface and attempt to decide if we
 753  *      have the same drive viewed twice. This occurs with crap CF adapters
 754  *      and PCMCIA sometimes.
 755  */
 756
 757 void ide_undecoded_slave(ide_drive_t *drive1)
 758 {
 759         ide_drive_t *drive0 = &drive1->hwif->drives[0];
 760
 761         if ((drive1->dn & 1) == 0 || drive0->present == 0)
 762                 return;
 763
 764         /* If the models don't match they are not the same product */
 765         if (strcmp(drive0->id->model, drive1->id->model))
 766                 return;
 767
 768         /* Serial numbers do not match */
 769         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 770                 return;
 771
 772         /* No serial number, thankfully very rare for CF */
 773         if (drive0->id->serial_no[0] == 0)
 774                 return;
 775
 776         /* Appears to be an IDE flash adapter with decode bugs */
 777         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 778
 779         drive1->present = 0;
 780 }
 781
 782 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 783
 784 static int ide_probe_port(ide_hwif_t *hwif)
 785 {
 786         unsigned long flags;
 787         unsigned int irqd;
 788         int unit, rc = -ENODEV;
 789
 790         BUG_ON(hwif->present);
 791
 792         if (hwif->drives[0].noprobe && hwif->drives[1].noprobe)
 793                 return -EACCES;
 794
 795         /*
 796          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 797          * we'll install our IRQ driver much later...
 798          */
 799         irqd = hwif->irq;
 800         if (irqd)
 801                 disable_irq(hwif->irq);
 802
 803         local_irq_set(flags);
 804
 805         if (ide_port_wait_ready(hwif) == -EBUSY)
 806                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 807
 808         /*
 809          * Second drive should only exist if first drive was found,
 810          * but a lot of cdrom drives are configured as single slaves.
 811          */
 812         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 813                 ide_drive_t *drive = &hwif->drives[unit];
 814                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 815                 (void) probe_for_drive(drive);
 816                 if (drive->present)
 817                         rc = 0;
 818         }
 819
 820         local_irq_restore(flags);
 821
 822         /*
 823          * Use cached IRQ number. It might be (and is...) changed by probe
 824          * code above
 825          */
 826         if (irqd)
 827                 enable_irq(irqd);
 828
 829         return rc;
 830 }
 831
 832 static void ide_port_tune_devices(ide_hwif_t *hwif)
 833 {
 834         const struct ide_port_ops *port_ops = hwif->port_ops;
 835         int unit;
 836
 837         for (unit = 0; unit < MAX_DRIVES; unit++) {
 838                 ide_drive_t *drive = &hwif->drives[unit];
 839
 840                 if (drive->present && port_ops && port_ops->quirkproc)
 841                         port_ops->quirkproc(drive);
 842         }
 843
 844         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 845                 ide_drive_t *drive = &hwif->drives[unit];
 846
 847                 if (drive->present) {
 848                         ide_set_max_pio(drive);
 849
 850                         drive->nice1 = 1;
 851
 852                         if (hwif->dma_ops)
 853                                 ide_set_dma(drive);
 854                 }
 855         }
 856
 857         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 858                 ide_drive_t *drive = &hwif->drives[unit];
 859
 860                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
 861                         drive->no_io_32bit = 1;
 862                 else
 863                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 864         }
 865 }
 866
 867 #if MAX_HWIFS > 1
 868 /*
 869  * save_match() is used to simplify logic in init_irq() below.
 870  *
 871  * A loophole here is that we may not know about a particular
 872  * hwif's irq until after that hwif is actually probed/initialized..
 873  * This could be a problem for the case where an hwif is on a
 874  * dual interface that requires serialization (eg. cmd640) and another
 875  * hwif using one of the same irqs is initialized beforehand.
 876  *
 877  * This routine detects and reports such situations, but does not fix them.
 878  */
 879 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 880 {
 881         ide_hwif_t *m = *match;
 882
 883         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 884                 if (!new->hwgroup)
 885                         return;
 886                 printk("%s: potential irq problem with %s and %s\n",
 887                         hwif->name, new->name, m->name);
 888         }
 889         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 890                 *match = new;
 891 }
 892 #endif /* MAX_HWIFS > 1 */
 893
 894 /*
 895  * init request queue
 896  */
 897 static int ide_init_queue(ide_drive_t *drive)
 898 {
 899         struct request_queue *q;
 900         ide_hwif_t *hwif = HWIF(drive);
 901         int max_sectors = 256;
 902         int max_sg_entries = PRD_ENTRIES;
 903
 904         /*
 905          *      Our default set up assumes the normal IDE case,
 906          *      that is 64K segmenting, standard PRD setup
 907          *      and LBA28. Some drivers then impose their own
 908          *      limits and LBA48 we could raise it but as yet
 909          *      do not.
 910          */
 911
 912         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 913         if (!q)
 914                 return 1;
 915
 916         q->queuedata = drive;
 917         blk_queue_segment_boundary(q, 0xffff);
 918
 919         if (hwif->rqsize < max_sectors)
 920                 max_sectors = hwif->rqsize;
 921         blk_queue_max_sectors(q, max_sectors);
 922
 923 #ifdef CONFIG_PCI
 924         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 925          * creates segments that don't completely match our boundary
 926          * requirements and thus need to be broken up again. Because it
 927          * doesn't align properly either, we may actually have to break up
 928          * to more segments than what was we got in the first place, a max
 929          * worst case is twice as many.
 930          * This will be fixed once we teach pci_map_sg() about our boundary
 931          * requirements, hopefully soon. *FIXME*
 932          */
 933         if (!PCI_DMA_BUS_IS_PHYS)
 934                 max_sg_entries >>= 1;
 935 #endif /* CONFIG_PCI */
 936
 937         blk_queue_max_hw_segments(q, max_sg_entries);
 938         blk_queue_max_phys_segments(q, max_sg_entries);
 939
 940         /* assign drive queue */
 941         drive->queue = q;
 942
 943         /* needs drive->queue to be set */
 944         ide_toggle_bounce(drive, 1);
 945
 946         return 0;
 947 }
 948
 949 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 950 {
 951         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 952
 953         spin_lock_irq(&ide_lock);
 954         if (!hwgroup->drive) {
 955                 /* first drive for hwgroup. */
 956                 drive->next = drive;
 957                 hwgroup->drive = drive;
 958                 hwgroup->hwif = HWIF(hwgroup->drive);
 959         } else {
 960                 drive->next = hwgroup->drive->next;
 961                 hwgroup->drive->next = drive;
 962         }
 963         spin_unlock_irq(&ide_lock);
 964 }
 965
 966 /*
 967  * For any present drive:
 968  * - allocate the block device queue
 969  * - link drive into the hwgroup
 970  */
 971 static void ide_port_setup_devices(ide_hwif_t *hwif)
 972 {
 973         int i;
 974
 975         mutex_lock(&ide_cfg_mtx);
 976         for (i = 0; i < MAX_DRIVES; i++) {
 977                 ide_drive_t *drive = &hwif->drives[i];
 978
 979                 if (!drive->present)
 980                         continue;
 981
 982                 if (ide_init_queue(drive)) {
 983                         printk(KERN_ERR "ide: failed to init %s\n",
 984                                         drive->name);
 985                         continue;
 986                 }
 987
 988                 ide_add_drive_to_hwgroup(drive);
 989         }
 990         mutex_unlock(&ide_cfg_mtx);
 991 }
 992
 993 static ide_hwif_t *ide_ports[MAX_HWIFS];
 994
 995 void ide_remove_port_from_hwgroup(ide_hwif_t *hwif)
 996 {
 997         ide_hwgroup_t *hwgroup = hwif->hwgroup;
 998
 999         ide_ports[hwif->index] = NULL;
1000
1001         spin_lock_irq(&ide_lock);
1002         /*
1003          * Remove us from the hwgroup, and free
1004          * the hwgroup if we were the only member
1005          */
1006         if (hwif->next == hwif) {
1007                 BUG_ON(hwgroup->hwif != hwif);
1008                 kfree(hwgroup);
1009         } else {
1010                 /* There is another interface in hwgroup.
1011                  * Unlink us, and set hwgroup->drive and ->hwif to
1012                  * something sane.
1013                  */
1014                 ide_hwif_t *g = hwgroup->hwif;
1015
1016                 while (g->next != hwif)
1017                         g = g->next;
1018                 g->next = hwif->next;
1019                 if (hwgroup->hwif == hwif) {
1020                         /* Chose a random hwif for hwgroup->hwif.
1021                          * It's guaranteed that there are no drives
1022                          * left in the hwgroup.
1023                          */
1024                         BUG_ON(hwgroup->drive != NULL);
1025                         hwgroup->hwif = g;
1026                 }
1027                 BUG_ON(hwgroup->hwif == hwif);
1028         }
1029         spin_unlock_irq(&ide_lock);
1030 }
1031
1032 /*
1033  * This routine sets up the irq for an ide interface, and creates a new
1034  * hwgroup for the irq/hwif if none was previously assigned.
1035  *
1036  * Much of the code is for correctly detecting/handling irq sharing
1037  * and irq serialization situations.  This is somewhat complex because
1038  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
1039  */
1040 static int init_irq (ide_hwif_t *hwif)
1041 {
1042         struct ide_io_ports *io_ports = &hwif->io_ports;
1043         unsigned int index;
1044         ide_hwgroup_t *hwgroup;
1045         ide_hwif_t *match = NULL;
1046
1047
1048         BUG_ON(in_interrupt());
1049         BUG_ON(irqs_disabled());
1050         BUG_ON(hwif == NULL);
1051
1052         mutex_lock(&ide_cfg_mtx);
1053         hwif->hwgroup = NULL;
1054 #if MAX_HWIFS > 1
1055         /*
1056          * Group up with any other hwifs that share our irq(s).
1057          */
1058         for (index = 0; index < MAX_HWIFS; index++) {
1059                 ide_hwif_t *h = ide_ports[index];
1060
1061                 if (h && h->hwgroup) {  /* scan only initialized ports */
1062                         if (hwif->irq == h->irq) {
1063                                 hwif->sharing_irq = h->sharing_irq = 1;
1064                                 if (hwif->chipset != ide_pci ||
1065                                     h->chipset != ide_pci) {
1066                                         save_match(hwif, h, &match);
1067                                 }
1068                         }
1069                         if (hwif->serialized) {
1070                                 if (hwif->mate && hwif->mate->irq == h->irq)
1071                                         save_match(hwif, h, &match);
1072                         }
1073                         if (h->serialized) {
1074                                 if (h->mate && hwif->irq == h->mate->irq)
1075                                         save_match(hwif, h, &match);
1076                         }
1077                 }
1078         }
1079 #endif /* MAX_HWIFS > 1 */
1080         /*
1081          * If we are still without a hwgroup, then form a new one
1082          */
1083         if (match) {
1084                 hwgroup = match->hwgroup;
1085                 hwif->hwgroup = hwgroup;
1086                 /*
1087                  * Link us into the hwgroup.
1088                  * This must be done early, do ensure that unexpected_intr
1089                  * can find the hwif and prevent irq storms.
1090                  * No drives are attached to the new hwif, choose_drive
1091                  * can't do anything stupid (yet).
1092                  * Add ourself as the 2nd entry to the hwgroup->hwif
1093                  * linked list, the first entry is the hwif that owns
1094                  * hwgroup->handler - do not change that.
1095                  */
1096                 spin_lock_irq(&ide_lock);
1097                 hwif->next = hwgroup->hwif->next;
1098                 hwgroup->hwif->next = hwif;
1099                 BUG_ON(hwif->next == hwif);
1100                 spin_unlock_irq(&ide_lock);
1101         } else {
1102                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1103                                        hwif_to_node(hwif));
1104                 if (hwgroup == NULL)
1105                         goto out_up;
1106
1107                 hwif->hwgroup = hwgroup;
1108                 hwgroup->hwif = hwif->next = hwif;
1109
1110                 init_timer(&hwgroup->timer);
1111                 hwgroup->timer.function = &ide_timer_expiry;
1112                 hwgroup->timer.data = (unsigned long) hwgroup;
1113         }
1114
1115         ide_ports[hwif->index] = hwif;
1116
1117         /*
1118          * Allocate the irq, if not already obtained for another hwif
1119          */
1120         if (!match || match->irq != hwif->irq) {
1121                 int sa = 0;
1122 #if defined(__mc68000__)
1123                 sa = IRQF_SHARED;
1124 #endif /* __mc68000__ */
1125
1126                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1127                         sa = IRQF_SHARED;
1128
1129                 if (io_ports->ctl_addr)
1130                         hwif->tp_ops->set_irq(hwif, 1);
1131
1132                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1133                         goto out_unlink;
1134         }
1135
1136         if (!hwif->rqsize) {
1137                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1138                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1139                         hwif->rqsize = 256;
1140                 else
1141                         hwif->rqsize = 65536;
1142         }
1143
1144 #if !defined(__mc68000__)
1145         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1146                 io_ports->data_addr, io_ports->status_addr,
1147                 io_ports->ctl_addr, hwif->irq);
1148 #else
1149         printk("%s at 0x%08lx on irq %d", hwif->name,
1150                 io_ports->data_addr, hwif->irq);
1151 #endif /* __mc68000__ */
1152         if (match)
1153                 printk(" (%sed with %s)",
1154                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1155         printk("\n");
1156
1157         mutex_unlock(&ide_cfg_mtx);
1158         return 0;
1159 out_unlink:
1160         ide_remove_port_from_hwgroup(hwif);
1161 out_up:
1162         mutex_unlock(&ide_cfg_mtx);
1163         return 1;
1164 }
1165
1166 static int ata_lock(dev_t dev, void *data)
1167 {
1168         /* FIXME: we want to pin hwif down */
1169         return 0;
1170 }
1171
1172 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1173 {
1174         ide_hwif_t *hwif = data;
1175         int unit = *part >> PARTN_BITS;
1176         ide_drive_t *drive = &hwif->drives[unit];
1177         if (!drive->present)
1178                 return NULL;
1179
1180         if (drive->media == ide_disk)
1181                 request_module("ide-disk");
1182         if (drive->scsi)
1183                 request_module("ide-scsi");
1184         if (drive->media == ide_cdrom || drive->media == ide_optical)
1185                 request_module("ide-cd");
1186         if (drive->media == ide_tape)
1187                 request_module("ide-tape");
1188         if (drive->media == ide_floppy)
1189                 request_module("ide-floppy");
1190
1191         return NULL;
1192 }
1193
1194 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1195 {
1196         struct gendisk *p = data;
1197         *part &= (1 << PARTN_BITS) - 1;
1198         return &p->dev.kobj;
1199 }
1200
1201 static int exact_lock(dev_t dev, void *data)
1202 {
1203         struct gendisk *p = data;
1204
1205         if (!get_disk(p))
1206                 return -1;
1207         return 0;
1208 }
1209
1210 void ide_register_region(struct gendisk *disk)
1211 {
1212         blk_register_region(MKDEV(disk->major, disk->first_minor),
1213                             disk->minors, NULL, exact_match, exact_lock, disk);
1214 }
1215
1216 EXPORT_SYMBOL_GPL(ide_register_region);
1217
1218 void ide_unregister_region(struct gendisk *disk)
1219 {
1220         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1221                               disk->minors);
1222 }
1223
1224 EXPORT_SYMBOL_GPL(ide_unregister_region);
1225
1226 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1227 {
1228         ide_hwif_t *hwif = drive->hwif;
1229         unsigned int unit = (drive->select.all >> 4) & 1;
1230
1231         disk->major = hwif->major;
1232         disk->first_minor = unit << PARTN_BITS;
1233         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1234         disk->queue = drive->queue;
1235 }
1236
1237 EXPORT_SYMBOL_GPL(ide_init_disk);
1238
1239 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1240 {
1241         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1242
1243         if (drive == drive->next) {
1244                 /* special case: last drive from hwgroup. */
1245                 BUG_ON(hwgroup->drive != drive);
1246                 hwgroup->drive = NULL;
1247         } else {
1248                 ide_drive_t *walk;
1249
1250                 walk = hwgroup->drive;
1251                 while (walk->next != drive)
1252                         walk = walk->next;
1253                 walk->next = drive->next;
1254                 if (hwgroup->drive == drive) {
1255                         hwgroup->drive = drive->next;
1256                         hwgroup->hwif = hwgroup->drive->hwif;
1257                 }
1258         }
1259         BUG_ON(hwgroup->drive == drive);
1260 }
1261
1262 static void drive_release_dev (struct device *dev)
1263 {
1264         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1265
1266         ide_proc_unregister_device(drive);
1267
1268         spin_lock_irq(&ide_lock);
1269         ide_remove_drive_from_hwgroup(drive);
1270         kfree(drive->id);
1271         drive->id = NULL;
1272         drive->present = 0;
1273         /* Messed up locking ... */
1274         spin_unlock_irq(&ide_lock);
1275         blk_cleanup_queue(drive->queue);
1276         spin_lock_irq(&ide_lock);
1277         drive->queue = NULL;
1278         spin_unlock_irq(&ide_lock);
1279
1280         complete(&drive->gendev_rel_comp);
1281 }
1282
1283 static int hwif_init(ide_hwif_t *hwif)
1284 {
1285         int old_irq;
1286
1287         if (!hwif->irq) {
1288                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1289                 if (!hwif->irq) {
1290                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1291                         return 0;
1292                 }
1293         }
1294
1295         if (register_blkdev(hwif->major, hwif->name))
1296                 return 0;
1297
1298         if (!hwif->sg_max_nents)
1299                 hwif->sg_max_nents = PRD_ENTRIES;
1300
1301         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1302                                  GFP_KERNEL);
1303         if (!hwif->sg_table) {
1304                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1305                 goto out;
1306         }
1307
1308         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1309
1310         if (init_irq(hwif) == 0)
1311                 goto done;
1312
1313         old_irq = hwif->irq;
1314         /*
1315          *      It failed to initialise. Find the default IRQ for
1316          *      this port and try that.
1317          */
1318         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1319         if (!hwif->irq) {
1320                 printk("%s: Disabled unable to get IRQ %d.\n",
1321                         hwif->name, old_irq);
1322                 goto out;
1323         }
1324         if (init_irq(hwif)) {
1325                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1326                         hwif->name, old_irq, hwif->irq);
1327                 goto out;
1328         }
1329         printk("%s: probed IRQ %d failed, using default.\n",
1330                 hwif->name, hwif->irq);
1331
1332 done:
1333         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1334                             THIS_MODULE, ata_probe, ata_lock, hwif);
1335         return 1;
1336
1337 out:
1338         unregister_blkdev(hwif->major, hwif->name);
1339         return 0;
1340 }
1341
1342 static void hwif_register_devices(ide_hwif_t *hwif)
1343 {
1344         unsigned int i;
1345
1346         for (i = 0; i < MAX_DRIVES; i++) {
1347                 ide_drive_t *drive = &hwif->drives[i];
1348                 struct device *dev = &drive->gendev;
1349                 int ret;
1350
1351                 if (!drive->present)
1352                         continue;
1353
1354                 ide_add_generic_settings(drive);
1355
1356                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1357                 dev->parent = &hwif->gendev;
1358                 dev->bus = &ide_bus_type;
1359                 dev->driver_data = drive;
1360                 dev->release = drive_release_dev;
1361
1362                 ret = device_register(dev);
1363                 if (ret < 0)
1364                         printk(KERN_WARNING "IDE: %s: device_register error: "
1365                                             "%d\n", __func__, ret);
1366         }
1367 }
1368
1369 static void ide_port_init_devices(ide_hwif_t *hwif)
1370 {
1371         const struct ide_port_ops *port_ops = hwif->port_ops;
1372         int i;
1373
1374         for (i = 0; i < MAX_DRIVES; i++) {
1375                 ide_drive_t *drive = &hwif->drives[i];
1376
1377                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1378                         drive->io_32bit = 1;
1379                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1380                         drive->unmask = 1;
1381                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1382                         drive->no_unmask = 1;
1383
1384                 if (port_ops && port_ops->init_dev)
1385                         port_ops->init_dev(drive);
1386         }
1387 }
1388
1389 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1390                           const struct ide_port_info *d)
1391 {
1392         hwif->channel = port;
1393
1394         if (d->chipset)
1395                 hwif->chipset = d->chipset;
1396
1397         if (d->init_iops)
1398                 d->init_iops(hwif);
1399
1400         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1401             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1402                 hwif->irq = port ? 15 : 14;
1403
1404         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1405         hwif->host_flags |= d->host_flags;
1406         hwif->pio_mask = d->pio_mask;
1407
1408         if (d->tp_ops)
1409                 hwif->tp_ops = d->tp_ops;
1410
1411         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1412         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1413                 hwif->port_ops = d->port_ops;
1414
1415         hwif->swdma_mask = d->swdma_mask;
1416         hwif->mwdma_mask = d->mwdma_mask;
1417         hwif->ultra_mask = d->udma_mask;
1418
1419         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1420                 int rc;
1421
1422                 if (d->init_dma)
1423                         rc = d->init_dma(hwif, d);
1424                 else
1425                         rc = ide_hwif_setup_dma(hwif, d);
1426
1427                 if (rc < 0) {
1428                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1429                         hwif->dma_base = 0;
1430                         hwif->swdma_mask = 0;
1431                         hwif->mwdma_mask = 0;
1432                         hwif->ultra_mask = 0;
1433                 } else if (d->dma_ops)
1434                         hwif->dma_ops = d->dma_ops;
1435         }
1436
1437         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1438             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1439                 if (hwif->mate)
1440                         hwif->mate->serialized = hwif->serialized = 1;
1441         }
1442
1443         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1444                 hwif->rqsize = 256;
1445
1446         /* call chipset specific routine for each enabled port */
1447         if (d->init_hwif)
1448                 d->init_hwif(hwif);
1449 }
1450
1451 static void ide_port_cable_detect(ide_hwif_t *hwif)
1452 {
1453         const struct ide_port_ops *port_ops = hwif->port_ops;
1454
1455         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1456                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1457                         hwif->cbl = port_ops->cable_detect(hwif);
1458         }
1459 }
1460
1461 static ssize_t store_delete_devices(struct device *portdev,
1462                                     struct device_attribute *attr,
1463                                     const char *buf, size_t n)
1464 {
1465         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1466
1467         if (strncmp(buf, "1", n))
1468                 return -EINVAL;
1469
1470         ide_port_unregister_devices(hwif);
1471
1472         return n;
1473 };
1474
1475 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1476
1477 static ssize_t store_scan(struct device *portdev,
1478                           struct device_attribute *attr,
1479                           const char *buf, size_t n)
1480 {
1481         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1482
1483         if (strncmp(buf, "1", n))
1484                 return -EINVAL;
1485
1486         ide_port_unregister_devices(hwif);
1487         ide_port_scan(hwif);
1488
1489         return n;
1490 };
1491
1492 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1493
1494 static struct device_attribute *ide_port_attrs[] = {
1495         &dev_attr_delete_devices,
1496         &dev_attr_scan,
1497         NULL
1498 };
1499
1500 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1501 {
1502         int i, rc;
1503
1504         for (i = 0; ide_port_attrs[i]; i++) {
1505                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1506                 if (rc)
1507                         break;
1508         }
1509
1510         return rc;
1511 }
1512
1513 static unsigned int ide_indexes;
1514
1515 /**
1516  *      ide_find_port_slot      -       find free port slot
1517  *      @d: IDE port info
1518  *
1519  *      Return the new port slot index or -ENOENT if we are out of free slots.
1520  */
1521
1522 static int ide_find_port_slot(const struct ide_port_info *d)
1523 {
1524         int idx = -ENOENT;
1525         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1526         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1527
1528         /*
1529          * Claim an unassigned slot.
1530          *
1531          * Give preference to claiming other slots before claiming ide0/ide1,
1532          * just in case there's another interface yet-to-be-scanned
1533          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1534          *
1535          * Unless there is a bootable card that does not use the standard
1536          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1537          */
1538         mutex_lock(&ide_cfg_mtx);
1539         if (MAX_HWIFS == 1) {
1540                 if (ide_indexes == 0 && i == 0)
1541                         idx = 1;
1542         } else {
1543                 if (bootable) {
1544                         if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1545                                 idx = ffz(ide_indexes | i);
1546                 } else {
1547                         if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1548                                 idx = ffz(ide_indexes | 3);
1549                         else if ((ide_indexes & 3) != 3)
1550                                 idx = ffz(ide_indexes);
1551                 }
1552         }
1553         if (idx >= 0)
1554                 ide_indexes |= (1 << idx);
1555         mutex_unlock(&ide_cfg_mtx);
1556
1557         return idx;
1558 }
1559
1560 static void ide_free_port_slot(int idx)
1561 {
1562         mutex_lock(&ide_cfg_mtx);
1563         ide_indexes &= ~(1 << idx);
1564         mutex_unlock(&ide_cfg_mtx);
1565 }
1566
1567 struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
1568                                     hw_regs_t **hws)
1569 {
1570         struct ide_host *host;
1571         int i;
1572
1573         host = kzalloc(sizeof(*host), GFP_KERNEL);
1574         if (host == NULL)
1575                 return NULL;
1576
1577         for (i = 0; i < MAX_HWIFS; i++) {
1578                 ide_hwif_t *hwif;
1579                 int idx;
1580
1581                 if (hws[i] == NULL)
1582                         continue;
1583
1584                 hwif = kzalloc(sizeof(*hwif), GFP_KERNEL);
1585                 if (hwif == NULL)
1586                         continue;
1587
1588                 idx = ide_find_port_slot(d);
1589                 if (idx < 0) {
1590                         printk(KERN_ERR "%s: no free slot for interface\n",
1591                                         d ? d->name : "ide");
1592                         kfree(hwif);
1593                         continue;
1594                 }
1595
1596                 ide_init_port_data(hwif, idx);
1597
1598                 host->ports[i] = hwif;
1599                 host->n_ports++;
1600         }
1601
1602         if (host->n_ports == 0) {
1603                 kfree(host);
1604                 return NULL;
1605         }
1606
1607         return host;
1608 }
1609 EXPORT_SYMBOL_GPL(ide_host_alloc_all);
1610
1611 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1612 {
1613         hw_regs_t *hws_all[MAX_HWIFS];
1614         int i;
1615
1616         for (i = 0; i < MAX_HWIFS; i++)
1617                 hws_all[i] = (i < 4) ? hws[i] : NULL;
1618
1619         return ide_host_alloc_all(d, hws_all);
1620 }
1621 EXPORT_SYMBOL_GPL(ide_host_alloc);
1622
1623 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1624                       hw_regs_t **hws)
1625 {
1626         ide_hwif_t *hwif, *mate = NULL;
1627         int i, j = 0;
1628
1629         for (i = 0; i < MAX_HWIFS; i++) {
1630                 hwif = host->ports[i];
1631
1632                 if (hwif == NULL) {
1633                         mate = NULL;
1634                         continue;
1635                 }
1636
1637                 ide_init_port_hw(hwif, hws[i]);
1638                 ide_port_apply_params(hwif);
1639
1640                 if (d == NULL) {
1641                         mate = NULL;
1642                         continue;
1643                 }
1644
1645                 if ((i & 1) && mate) {
1646                         hwif->mate = mate;
1647                         mate->mate = hwif;
1648                 }
1649
1650                 mate = (i & 1) ? NULL : hwif;
1651
1652                 ide_init_port(hwif, i & 1, d);
1653                 ide_port_cable_detect(hwif);
1654                 ide_port_init_devices(hwif);
1655         }
1656
1657         for (i = 0; i < MAX_HWIFS; i++) {
1658                 hwif = host->ports[i];
1659
1660                 if (hwif == NULL)
1661                         continue;
1662
1663                 if (ide_probe_port(hwif) == 0)
1664                         hwif->present = 1;
1665
1666                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1667                     !hwif->mate->present)
1668                         ide_register_port(hwif);
1669
1670                 if (hwif->present)
1671                         ide_port_tune_devices(hwif);
1672         }
1673
1674         for (i = 0; i < MAX_HWIFS; i++) {
1675                 hwif = host->ports[i];
1676
1677                 if (hwif == NULL)
1678                         continue;
1679
1680                 if (hwif_init(hwif) == 0) {
1681                         printk(KERN_INFO "%s: failed to initialize IDE "
1682                                          "interface\n", hwif->name);
1683                         hwif->present = 0;
1684                         continue;
1685                 }
1686
1687                 j++;
1688
1689                 if (hwif->present)
1690                         ide_port_setup_devices(hwif);
1691
1692                 ide_acpi_init(hwif);
1693
1694                 if (hwif->present)
1695                         ide_acpi_port_init_devices(hwif);
1696         }
1697
1698         for (i = 0; i < MAX_HWIFS; i++) {
1699                 hwif = host->ports[i];
1700
1701                 if (hwif == NULL)
1702                         continue;
1703
1704                 if (hwif->chipset == ide_unknown)
1705                         hwif->chipset = ide_generic;
1706
1707                 if (hwif->present)
1708                         hwif_register_devices(hwif);
1709         }
1710
1711         for (i = 0; i < MAX_HWIFS; i++) {
1712                 hwif = host->ports[i];
1713
1714                 if (hwif == NULL)
1715                         continue;
1716
1717                 ide_sysfs_register_port(hwif);
1718                 ide_proc_register_port(hwif);
1719
1720                 if (hwif->present)
1721                         ide_proc_port_register_devices(hwif);
1722         }
1723
1724         return j ? 0 : -1;
1725 }
1726 EXPORT_SYMBOL_GPL(ide_host_register);
1727
1728 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1729                  struct ide_host **hostp)
1730 {
1731         struct ide_host *host;
1732         int rc;
1733
1734         host = ide_host_alloc(d, hws);
1735         if (host == NULL)
1736                 return -ENOMEM;
1737
1738         rc = ide_host_register(host, d, hws);
1739         if (rc) {
1740                 ide_host_free(host);
1741                 return rc;
1742         }
1743
1744         if (hostp)
1745                 *hostp = host;
1746
1747         return 0;
1748 }
1749 EXPORT_SYMBOL_GPL(ide_host_add);
1750
1751 void ide_host_free(struct ide_host *host)
1752 {
1753         ide_hwif_t *hwif;
1754         int i;
1755
1756         for (i = 0; i < MAX_HWIFS; i++) {
1757                 hwif = host->ports[i];
1758
1759                 if (hwif == NULL)
1760                         continue;
1761
1762                 ide_free_port_slot(hwif->index);
1763                 kfree(hwif);
1764         }
1765
1766         kfree(host);
1767 }
1768 EXPORT_SYMBOL_GPL(ide_host_free);
1769
1770 void ide_host_remove(struct ide_host *host)
1771 {
1772         int i;
1773
1774         for (i = 0; i < MAX_HWIFS; i++) {
1775                 if (host->ports[i])
1776                         ide_unregister(host->ports[i]);
1777         }
1778
1779         ide_host_free(host);
1780 }
1781 EXPORT_SYMBOL_GPL(ide_host_remove);
1782
1783 void ide_port_scan(ide_hwif_t *hwif)
1784 {
1785         ide_port_apply_params(hwif);
1786         ide_port_cable_detect(hwif);
1787         ide_port_init_devices(hwif);
1788
1789         if (ide_probe_port(hwif) < 0)
1790                 return;
1791
1792         hwif->present = 1;
1793
1794         ide_port_tune_devices(hwif);
1795         ide_acpi_port_init_devices(hwif);
1796         ide_port_setup_devices(hwif);
1797         hwif_register_devices(hwif);
1798         ide_proc_port_register_devices(hwif);
1799 }
1800 EXPORT_SYMBOL_GPL(ide_port_scan);
1801
1802 static void ide_legacy_init_one(hw_regs_t **hws, hw_regs_t *hw,
1803                                 u8 port_no, const struct ide_port_info *d,
1804                                 unsigned long config)
1805 {
1806         unsigned long base, ctl;
1807         int irq;
1808
1809         if (port_no == 0) {
1810                 base = 0x1f0;
1811                 ctl  = 0x3f6;
1812                 irq  = 14;
1813         } else {
1814                 base = 0x170;
1815                 ctl  = 0x376;
1816                 irq  = 15;
1817         }
1818
1819         if (!request_region(base, 8, d->name)) {
1820                 printk(KERN_ERR "%s: I/O resource 0x%lX-0x%lX not free.\n",
1821                                 d->name, base, base + 7);
1822                 return;
1823         }
1824
1825         if (!request_region(ctl, 1, d->name)) {
1826                 printk(KERN_ERR "%s: I/O resource 0x%lX not free.\n",
1827                                 d->name, ctl);
1828                 release_region(base, 8);
1829                 return;
1830         }
1831
1832         ide_std_init_ports(hw, base, ctl);
1833         hw->irq = irq;
1834         hw->chipset = d->chipset;
1835         hw->config = config;
1836
1837         hws[port_no] = hw;
1838 }
1839
1840 int ide_legacy_device_add(const struct ide_port_info *d, unsigned long config)
1841 {
1842         hw_regs_t hw[2], *hws[] = { NULL, NULL, NULL, NULL };
1843
1844         memset(&hw, 0, sizeof(hw));
1845
1846         if ((d->host_flags & IDE_HFLAG_QD_2ND_PORT) == 0)
1847                 ide_legacy_init_one(hws, &hw[0], 0, d, config);
1848         ide_legacy_init_one(hws, &hw[1], 1, d, config);
1849
1850         if (hws[0] == NULL && hws[1] == NULL &&
1851             (d->host_flags & IDE_HFLAG_SINGLE))
1852                 return -ENOENT;
1853
1854         return ide_host_add(d, hws, NULL);
1855 }
1856 EXPORT_SYMBOL_GPL(ide_legacy_device_add);