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->ata_input_data(drive, id, SECTOR_WORDS);
 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         int use_altstatus = 0, rc;
 268         unsigned long timeout;
 269         u8 s = 0, a = 0;
 270
 271         /* take a deep breath */
 272         msleep(50);
 273
 274         if (hwif->io_ports[IDE_CONTROL_OFFSET]) {
 275                 a = ide_read_altstatus(drive);
 276                 s = ide_read_status(drive);
 277                 if ((a ^ s) & ~INDEX_STAT)
 278                         /* ancient Seagate drives, broken interfaces */
 279                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 280                                          "instead of ALTSTATUS(0x%02x)\n",
 281                                          drive->name, s, a);
 282                 else
 283                         /* use non-intrusive polling */
 284                         use_altstatus = 1;
 285         }
 286
 287         /* set features register for atapi
 288          * identify command to be sure of reply
 289          */
 290         if ((cmd == WIN_PIDENTIFY))
 291                 /* disable dma & overlap */
 292                 hwif->OUTB(0, hwif->io_ports[IDE_FEATURE_OFFSET]);
 293
 294         /* ask drive for ID */
 295         hwif->OUTB(cmd, hwif->io_ports[IDE_COMMAND_OFFSET]);
 296
 297         timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 298         timeout += jiffies;
 299         do {
 300                 if (time_after(jiffies, timeout)) {
 301                         /* drive timed-out */
 302                         return 1;
 303                 }
 304                 /* give drive a breather */
 305                 msleep(50);
 306                 s = use_altstatus ? ide_read_altstatus(drive)
 307                                   : ide_read_status(drive);
 308         } while (s & BUSY_STAT);
 309
 310         /* wait for IRQ and DRQ_STAT */
 311         msleep(50);
 312         s = ide_read_status(drive);
 313
 314         if (OK_STAT(s, DRQ_STAT, BAD_R_STAT)) {
 315                 unsigned long flags;
 316
 317                 /* local CPU only; some systems need this */
 318                 local_irq_save(flags);
 319                 /* drive returned ID */
 320                 do_identify(drive, cmd);
 321                 /* drive responded with ID */
 322                 rc = 0;
 323                 /* clear drive IRQ */
 324                 (void)ide_read_status(drive);
 325                 local_irq_restore(flags);
 326         } else {
 327                 /* drive refused ID */
 328                 rc = 2;
 329         }
 330         return rc;
 331 }
 332
 333 /**
 334  *      try_to_identify -       try to identify a drive
 335  *      @drive: drive to probe
 336  *      @cmd: command to use
 337  *
 338  *      Issue the identify command and then do IRQ probing to
 339  *      complete the identification when needed by finding the
 340  *      IRQ the drive is attached to
 341  */
 342
 343 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 344 {
 345         ide_hwif_t *hwif = HWIF(drive);
 346         int retval;
 347         int autoprobe = 0;
 348         unsigned long cookie = 0;
 349
 350         /*
 351          * Disable device irq unless we need to
 352          * probe for it. Otherwise we'll get spurious
 353          * interrupts during the identify-phase that
 354          * the irq handler isn't expecting.
 355          */
 356         if (hwif->io_ports[IDE_CONTROL_OFFSET]) {
 357                 if (!hwif->irq) {
 358                         autoprobe = 1;
 359                         cookie = probe_irq_on();
 360                 }
 361                 ide_set_irq(drive, autoprobe);
 362         }
 363
 364         retval = actual_try_to_identify(drive, cmd);
 365
 366         if (autoprobe) {
 367                 int irq;
 368
 369                 ide_set_irq(drive, 0);
 370                 /* clear drive IRQ */
 371                 (void)ide_read_status(drive);
 372                 udelay(5);
 373                 irq = probe_irq_off(cookie);
 374                 if (!hwif->irq) {
 375                         if (irq > 0) {
 376                                 hwif->irq = irq;
 377                         } else {
 378                                 /* Mmmm.. multiple IRQs..
 379                                  * don't know which was ours
 380                                  */
 381                                 printk("%s: IRQ probe failed (0x%lx)\n",
 382                                         drive->name, cookie);
 383                         }
 384                 }
 385         }
 386         return retval;
 387 }
 388
 389 static int ide_busy_sleep(ide_hwif_t *hwif)
 390 {
 391         unsigned long timeout = jiffies + WAIT_WORSTCASE;
 392         u8 stat;
 393
 394         do {
 395                 msleep(50);
 396                 stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 397                 if ((stat & BUSY_STAT) == 0)
 398                         return 0;
 399         } while (time_before(jiffies, timeout));
 400
 401         return 1;
 402 }
 403
 404 /**
 405  *      do_probe                -       probe an IDE device
 406  *      @drive: drive to probe
 407  *      @cmd: command to use
 408  *
 409  *      do_probe() has the difficult job of finding a drive if it exists,
 410  *      without getting hung up if it doesn't exist, without trampling on
 411  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 412  *
 413  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 414  *      but does not respond right away, the probe will "hang in there"
 415  *      for the maximum wait time (about 30 seconds), otherwise it will
 416  *      exit much more quickly.
 417  *
 418  * Returns:     0  device was identified
 419  *              1  device timed-out (no response to identify request)
 420  *              2  device aborted the command (refused to identify itself)
 421  *              3  bad status from device (possible for ATAPI drives)
 422  *              4  probe was not attempted because failure was obvious
 423  */
 424
 425 static int do_probe (ide_drive_t *drive, u8 cmd)
 426 {
 427         ide_hwif_t *hwif = HWIF(drive);
 428         int rc;
 429         u8 stat;
 430
 431         if (drive->present) {
 432                 /* avoid waiting for inappropriate probes */
 433                 if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 434                         return 4;
 435         }
 436 #ifdef DEBUG
 437         printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 438                 drive->name, drive->present, drive->media,
 439                 (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 440 #endif
 441
 442         /* needed for some systems
 443          * (e.g. crw9624 as drive0 with disk as slave)
 444          */
 445         msleep(50);
 446         SELECT_DRIVE(drive);
 447         msleep(50);
 448         if (hwif->INB(hwif->io_ports[IDE_SELECT_OFFSET]) != drive->select.all &&
 449             !drive->present) {
 450                 if (drive->select.b.unit != 0) {
 451                         /* exit with drive0 selected */
 452                         SELECT_DRIVE(&hwif->drives[0]);
 453                         /* allow BUSY_STAT to assert & clear */
 454                         msleep(50);
 455                 }
 456                 /* no i/f present: mmm.. this should be a 4 -ml */
 457                 return 3;
 458         }
 459
 460         stat = ide_read_status(drive);
 461
 462         if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
 463             drive->present || cmd == WIN_PIDENTIFY) {
 464                 /* send cmd and wait */
 465                 if ((rc = try_to_identify(drive, cmd))) {
 466                         /* failed: try again */
 467                         rc = try_to_identify(drive,cmd);
 468                 }
 469
 470                 stat = ide_read_status(drive);
 471
 472                 if (stat == (BUSY_STAT | READY_STAT))
 473                         return 4;
 474
 475                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 476                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 477                         (drive->autotune == IDE_TUNE_AUTO))) {
 478                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 479                                         "resetting drive\n", drive->name, stat);
 480                         msleep(50);
 481                         hwif->OUTB(drive->select.all,
 482                                    hwif->io_ports[IDE_SELECT_OFFSET]);
 483                         msleep(50);
 484                         hwif->OUTB(WIN_SRST,
 485                                    hwif->io_ports[IDE_COMMAND_OFFSET]);
 486                         (void)ide_busy_sleep(hwif);
 487                         rc = try_to_identify(drive, cmd);
 488                 }
 489
 490                 /* ensure drive IRQ is clear */
 491                 stat = ide_read_status(drive);
 492
 493                 if (rc == 1)
 494                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 495                                         drive->name, stat);
 496         } else {
 497                 /* not present or maybe ATAPI */
 498                 rc = 3;
 499         }
 500         if (drive->select.b.unit != 0) {
 501                 /* exit with drive0 selected */
 502                 SELECT_DRIVE(&hwif->drives[0]);
 503                 msleep(50);
 504                 /* ensure drive irq is clear */
 505                 (void)ide_read_status(drive);
 506         }
 507         return rc;
 508 }
 509
 510 /*
 511  *
 512  */
 513 static void enable_nest (ide_drive_t *drive)
 514 {
 515         ide_hwif_t *hwif = HWIF(drive);
 516         u8 stat;
 517
 518         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 519         SELECT_DRIVE(drive);
 520         msleep(50);
 521         hwif->OUTB(EXABYTE_ENABLE_NEST, hwif->io_ports[IDE_COMMAND_OFFSET]);
 522
 523         if (ide_busy_sleep(hwif)) {
 524                 printk(KERN_CONT "failed (timeout)\n");
 525                 return;
 526         }
 527
 528         msleep(50);
 529
 530         stat = ide_read_status(drive);
 531
 532         if (!OK_STAT(stat, 0, BAD_STAT))
 533                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 534         else
 535                 printk(KERN_CONT "success\n");
 536
 537         /* if !(success||timed-out) */
 538         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 539                 /* look for ATAPI device */
 540                 (void) do_probe(drive, WIN_PIDENTIFY);
 541         }
 542 }
 543
 544 /**
 545  *      probe_for_drives        -       upper level drive probe
 546  *      @drive: drive to probe for
 547  *
 548  *      probe_for_drive() tests for existence of a given drive using do_probe()
 549  *      and presents things to the user as needed.
 550  *
 551  *      Returns:        0  no device was found
 552  *                      1  device was found (note: drive->present might
 553  *                         still be 0)
 554  */
 555
 556 static inline u8 probe_for_drive (ide_drive_t *drive)
 557 {
 558         /*
 559          *      In order to keep things simple we have an id
 560          *      block for all drives at all times. If the device
 561          *      is pre ATA or refuses ATA/ATAPI identify we
 562          *      will add faked data to this.
 563          *
 564          *      Also note that 0 everywhere means "can't do X"
 565          */
 566
 567         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 568         drive->id_read = 0;
 569         if(drive->id == NULL)
 570         {
 571                 printk(KERN_ERR "ide: out of memory for id data.\n");
 572                 return 0;
 573         }
 574         strcpy(drive->id->model, "UNKNOWN");
 575
 576         /* skip probing? */
 577         if (!drive->noprobe)
 578         {
 579                 /* if !(success||timed-out) */
 580                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 581                         /* look for ATAPI device */
 582                         (void) do_probe(drive, WIN_PIDENTIFY);
 583                 }
 584                 if (!drive->present)
 585                         /* drive not found */
 586                         return 0;
 587                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 588                         enable_nest(drive);
 589
 590                 /* identification failed? */
 591                 if (!drive->id_read) {
 592                         if (drive->media == ide_disk) {
 593                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 594                                         drive->name, drive->cyl,
 595                                         drive->head, drive->sect);
 596                         } else if (drive->media == ide_cdrom) {
 597                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 598                         } else {
 599                                 /* nuke it */
 600                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 601                                 drive->present = 0;
 602                         }
 603                 }
 604                 /* drive was found */
 605         }
 606         if(!drive->present)
 607                 return 0;
 608         /* The drive wasn't being helpful. Add generic info only */
 609         if (drive->id_read == 0) {
 610                 generic_id(drive);
 611                 return 1;
 612         }
 613
 614         if (drive->media == ide_disk) {
 615                 ide_disk_init_chs(drive);
 616                 ide_disk_init_mult_count(drive);
 617         }
 618
 619         return drive->present;
 620 }
 621
 622 static void hwif_release_dev (struct device *dev)
 623 {
 624         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 625
 626         complete(&hwif->gendev_rel_comp);
 627 }
 628
 629 static int ide_register_port(ide_hwif_t *hwif)
 630 {
 631         int ret;
 632
 633         /* register with global device tree */
 634         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 635         hwif->gendev.driver_data = hwif;
 636         if (hwif->gendev.parent == NULL) {
 637                 if (hwif->dev)
 638                         hwif->gendev.parent = hwif->dev;
 639                 else
 640                         /* Would like to do = &device_legacy */
 641                         hwif->gendev.parent = NULL;
 642         }
 643         hwif->gendev.release = hwif_release_dev;
 644         ret = device_register(&hwif->gendev);
 645         if (ret < 0) {
 646                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 647                         __FUNCTION__, ret);
 648                 goto out;
 649         }
 650
 651         get_device(&hwif->gendev);
 652
 653         hwif->portdev = device_create(ide_port_class, &hwif->gendev,
 654                                       MKDEV(0, 0), hwif->name);
 655         if (IS_ERR(hwif->portdev)) {
 656                 ret = PTR_ERR(hwif->portdev);
 657                 device_unregister(&hwif->gendev);
 658         }
 659         dev_set_drvdata(hwif->portdev, hwif);
 660 out:
 661         return ret;
 662 }
 663
 664 /**
 665  *      ide_port_wait_ready     -       wait for port to become ready
 666  *      @hwif: IDE port
 667  *
 668  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 669  *      platforms.  Typical cases are:
 670  *
 671  *      - The firmware hard reset the disk before booting the kernel,
 672  *        the drive is still doing it's poweron-reset sequence, that
 673  *        can take up to 30 seconds.
 674  *
 675  *      - The firmware does nothing (or no firmware), the device is
 676  *        still in POST state (same as above actually).
 677  *
 678  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 679  *        their reset sequence even when they are non-selected slave
 680  *        devices, thus preventing discovery of the main HD.
 681  *
 682  *      Doing this wait-for-non-busy should not harm any existing
 683  *      configuration and fix some issues like the above.
 684  *
 685  *      BenH.
 686  *
 687  *      Returns 0 on success, error code (< 0) otherwise.
 688  */
 689
 690 static int ide_port_wait_ready(ide_hwif_t *hwif)
 691 {
 692         int unit, rc;
 693
 694         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 695
 696         /* Let HW settle down a bit from whatever init state we
 697          * come from */
 698         mdelay(2);
 699
 700         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 701          * I know of at least one disk who takes 31 seconds, I use 35
 702          * here to be safe
 703          */
 704         rc = ide_wait_not_busy(hwif, 35000);
 705         if (rc)
 706                 return rc;
 707
 708         /* Now make sure both master & slave are ready */
 709         for (unit = 0; unit < MAX_DRIVES; unit++) {
 710                 ide_drive_t *drive = &hwif->drives[unit];
 711
 712                 /* Ignore disks that we will not probe for later. */
 713                 if (!drive->noprobe || drive->present) {
 714                         SELECT_DRIVE(drive);
 715                         ide_set_irq(drive, 1);
 716                         mdelay(2);
 717                         rc = ide_wait_not_busy(hwif, 35000);
 718                         if (rc)
 719                                 goto out;
 720                 } else
 721                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 722                                           drive->name);
 723         }
 724 out:
 725         /* Exit function with master reselected (let's be sane) */
 726         if (unit)
 727                 SELECT_DRIVE(&hwif->drives[0]);
 728
 729         return rc;
 730 }
 731
 732 /**
 733  *      ide_undecoded_slave     -       look for bad CF adapters
 734  *      @drive1: drive
 735  *
 736  *      Analyse the drives on the interface and attempt to decide if we
 737  *      have the same drive viewed twice. This occurs with crap CF adapters
 738  *      and PCMCIA sometimes.
 739  */
 740
 741 void ide_undecoded_slave(ide_drive_t *drive1)
 742 {
 743         ide_drive_t *drive0 = &drive1->hwif->drives[0];
 744
 745         if ((drive1->dn & 1) == 0 || drive0->present == 0)
 746                 return;
 747
 748         /* If the models don't match they are not the same product */
 749         if (strcmp(drive0->id->model, drive1->id->model))
 750                 return;
 751
 752         /* Serial numbers do not match */
 753         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 754                 return;
 755
 756         /* No serial number, thankfully very rare for CF */
 757         if (drive0->id->serial_no[0] == 0)
 758                 return;
 759
 760         /* Appears to be an IDE flash adapter with decode bugs */
 761         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 762
 763         drive1->present = 0;
 764 }
 765
 766 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 767
 768 static int ide_probe_port(ide_hwif_t *hwif)
 769 {
 770         unsigned long flags;
 771         unsigned int irqd;
 772         int unit, rc = -ENODEV;
 773
 774         BUG_ON(hwif->present);
 775
 776         if (hwif->noprobe ||
 777             (hwif->drives[0].noprobe && hwif->drives[1].noprobe))
 778                 return -EACCES;
 779
 780         /*
 781          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 782          * we'll install our IRQ driver much later...
 783          */
 784         irqd = hwif->irq;
 785         if (irqd)
 786                 disable_irq(hwif->irq);
 787
 788         local_irq_set(flags);
 789
 790         if (ide_port_wait_ready(hwif) == -EBUSY)
 791                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 792
 793         /*
 794          * Second drive should only exist if first drive was found,
 795          * but a lot of cdrom drives are configured as single slaves.
 796          */
 797         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 798                 ide_drive_t *drive = &hwif->drives[unit];
 799                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 800                 (void) probe_for_drive(drive);
 801                 if (drive->present)
 802                         rc = 0;
 803         }
 804         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 805                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 806                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 807                 udelay(10);
 808                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 809                 (void)ide_busy_sleep(hwif);
 810         }
 811         local_irq_restore(flags);
 812         /*
 813          * Use cached IRQ number. It might be (and is...) changed by probe
 814          * code above
 815          */
 816         if (irqd)
 817                 enable_irq(irqd);
 818
 819         return rc;
 820 }
 821
 822 static void ide_port_tune_devices(ide_hwif_t *hwif)
 823 {
 824         const struct ide_port_ops *port_ops = hwif->port_ops;
 825         int unit;
 826
 827         for (unit = 0; unit < MAX_DRIVES; unit++) {
 828                 ide_drive_t *drive = &hwif->drives[unit];
 829
 830                 if (drive->present && port_ops && port_ops->quirkproc)
 831                         port_ops->quirkproc(drive);
 832         }
 833
 834         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 835                 ide_drive_t *drive = &hwif->drives[unit];
 836
 837                 if (drive->present) {
 838                         if (drive->autotune == IDE_TUNE_AUTO)
 839                                 ide_set_max_pio(drive);
 840
 841                         if (drive->autotune != IDE_TUNE_DEFAULT &&
 842                             drive->autotune != IDE_TUNE_AUTO)
 843                                 continue;
 844
 845                         drive->nice1 = 1;
 846
 847                         if (hwif->dma_host_set)
 848                                 ide_set_dma(drive);
 849                 }
 850         }
 851
 852         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 853                 ide_drive_t *drive = &hwif->drives[unit];
 854
 855                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
 856                         drive->no_io_32bit = 1;
 857                 else
 858                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 859         }
 860 }
 861
 862 #if MAX_HWIFS > 1
 863 /*
 864  * save_match() is used to simplify logic in init_irq() below.
 865  *
 866  * A loophole here is that we may not know about a particular
 867  * hwif's irq until after that hwif is actually probed/initialized..
 868  * This could be a problem for the case where an hwif is on a
 869  * dual interface that requires serialization (eg. cmd640) and another
 870  * hwif using one of the same irqs is initialized beforehand.
 871  *
 872  * This routine detects and reports such situations, but does not fix them.
 873  */
 874 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 875 {
 876         ide_hwif_t *m = *match;
 877
 878         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 879                 if (!new->hwgroup)
 880                         return;
 881                 printk("%s: potential irq problem with %s and %s\n",
 882                         hwif->name, new->name, m->name);
 883         }
 884         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 885                 *match = new;
 886 }
 887 #endif /* MAX_HWIFS > 1 */
 888
 889 /*
 890  * init request queue
 891  */
 892 static int ide_init_queue(ide_drive_t *drive)
 893 {
 894         struct request_queue *q;
 895         ide_hwif_t *hwif = HWIF(drive);
 896         int max_sectors = 256;
 897         int max_sg_entries = PRD_ENTRIES;
 898
 899         /*
 900          *      Our default set up assumes the normal IDE case,
 901          *      that is 64K segmenting, standard PRD setup
 902          *      and LBA28. Some drivers then impose their own
 903          *      limits and LBA48 we could raise it but as yet
 904          *      do not.
 905          */
 906
 907         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 908         if (!q)
 909                 return 1;
 910
 911         q->queuedata = drive;
 912         blk_queue_segment_boundary(q, 0xffff);
 913
 914         if (hwif->rqsize < max_sectors)
 915                 max_sectors = hwif->rqsize;
 916         blk_queue_max_sectors(q, max_sectors);
 917
 918 #ifdef CONFIG_PCI
 919         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 920          * creates segments that don't completely match our boundary
 921          * requirements and thus need to be broken up again. Because it
 922          * doesn't align properly either, we may actually have to break up
 923          * to more segments than what was we got in the first place, a max
 924          * worst case is twice as many.
 925          * This will be fixed once we teach pci_map_sg() about our boundary
 926          * requirements, hopefully soon. *FIXME*
 927          */
 928         if (!PCI_DMA_BUS_IS_PHYS)
 929                 max_sg_entries >>= 1;
 930 #endif /* CONFIG_PCI */
 931
 932         blk_queue_max_hw_segments(q, max_sg_entries);
 933         blk_queue_max_phys_segments(q, max_sg_entries);
 934
 935         /* assign drive queue */
 936         drive->queue = q;
 937
 938         /* needs drive->queue to be set */
 939         ide_toggle_bounce(drive, 1);
 940
 941         return 0;
 942 }
 943
 944 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 945 {
 946         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 947
 948         spin_lock_irq(&ide_lock);
 949         if (!hwgroup->drive) {
 950                 /* first drive for hwgroup. */
 951                 drive->next = drive;
 952                 hwgroup->drive = drive;
 953                 hwgroup->hwif = HWIF(hwgroup->drive);
 954         } else {
 955                 drive->next = hwgroup->drive->next;
 956                 hwgroup->drive->next = drive;
 957         }
 958         spin_unlock_irq(&ide_lock);
 959 }
 960
 961 /*
 962  * For any present drive:
 963  * - allocate the block device queue
 964  * - link drive into the hwgroup
 965  */
 966 static void ide_port_setup_devices(ide_hwif_t *hwif)
 967 {
 968         int i;
 969
 970         mutex_lock(&ide_cfg_mtx);
 971         for (i = 0; i < MAX_DRIVES; i++) {
 972                 ide_drive_t *drive = &hwif->drives[i];
 973
 974                 if (!drive->present)
 975                         continue;
 976
 977                 if (ide_init_queue(drive)) {
 978                         printk(KERN_ERR "ide: failed to init %s\n",
 979                                         drive->name);
 980                         continue;
 981                 }
 982
 983                 ide_add_drive_to_hwgroup(drive);
 984         }
 985         mutex_unlock(&ide_cfg_mtx);
 986 }
 987
 988 /*
 989  * This routine sets up the irq for an ide interface, and creates a new
 990  * hwgroup for the irq/hwif if none was previously assigned.
 991  *
 992  * Much of the code is for correctly detecting/handling irq sharing
 993  * and irq serialization situations.  This is somewhat complex because
 994  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 995  */
 996 static int init_irq (ide_hwif_t *hwif)
 997 {
 998         unsigned int index;
 999         ide_hwgroup_t *hwgroup;
1000         ide_hwif_t *match = NULL;
1001
1002
1003         BUG_ON(in_interrupt());
1004         BUG_ON(irqs_disabled());
1005         BUG_ON(hwif == NULL);
1006
1007         mutex_lock(&ide_cfg_mtx);
1008         hwif->hwgroup = NULL;
1009 #if MAX_HWIFS > 1
1010         /*
1011          * Group up with any other hwifs that share our irq(s).
1012          */
1013         for (index = 0; index < MAX_HWIFS; index++) {
1014                 ide_hwif_t *h = &ide_hwifs[index];
1015                 if (h->hwgroup) {  /* scan only initialized hwif's */
1016                         if (hwif->irq == h->irq) {
1017                                 hwif->sharing_irq = h->sharing_irq = 1;
1018                                 if (hwif->chipset != ide_pci ||
1019                                     h->chipset != ide_pci) {
1020                                         save_match(hwif, h, &match);
1021                                 }
1022                         }
1023                         if (hwif->serialized) {
1024                                 if (hwif->mate && hwif->mate->irq == h->irq)
1025                                         save_match(hwif, h, &match);
1026                         }
1027                         if (h->serialized) {
1028                                 if (h->mate && hwif->irq == h->mate->irq)
1029                                         save_match(hwif, h, &match);
1030                         }
1031                 }
1032         }
1033 #endif /* MAX_HWIFS > 1 */
1034         /*
1035          * If we are still without a hwgroup, then form a new one
1036          */
1037         if (match) {
1038                 hwgroup = match->hwgroup;
1039                 hwif->hwgroup = hwgroup;
1040                 /*
1041                  * Link us into the hwgroup.
1042                  * This must be done early, do ensure that unexpected_intr
1043                  * can find the hwif and prevent irq storms.
1044                  * No drives are attached to the new hwif, choose_drive
1045                  * can't do anything stupid (yet).
1046                  * Add ourself as the 2nd entry to the hwgroup->hwif
1047                  * linked list, the first entry is the hwif that owns
1048                  * hwgroup->handler - do not change that.
1049                  */
1050                 spin_lock_irq(&ide_lock);
1051                 hwif->next = hwgroup->hwif->next;
1052                 hwgroup->hwif->next = hwif;
1053                 BUG_ON(hwif->next == hwif);
1054                 spin_unlock_irq(&ide_lock);
1055         } else {
1056                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1057                                        hwif_to_node(hwif));
1058                 if (hwgroup == NULL)
1059                         goto out_up;
1060
1061                 hwif->hwgroup = hwgroup;
1062                 hwgroup->hwif = hwif->next = hwif;
1063
1064                 init_timer(&hwgroup->timer);
1065                 hwgroup->timer.function = &ide_timer_expiry;
1066                 hwgroup->timer.data = (unsigned long) hwgroup;
1067         }
1068
1069         /*
1070          * Allocate the irq, if not already obtained for another hwif
1071          */
1072         if (!match || match->irq != hwif->irq) {
1073                 int sa = 0;
1074 #if defined(__mc68000__)
1075                 sa = IRQF_SHARED;
1076 #endif /* __mc68000__ */
1077
1078                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1079                         sa = IRQF_SHARED;
1080
1081                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1082                         /* clear nIEN */
1083                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1084
1085                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1086                         goto out_unlink;
1087         }
1088
1089         if (!hwif->rqsize) {
1090                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1091                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1092                         hwif->rqsize = 256;
1093                 else
1094                         hwif->rqsize = 65536;
1095         }
1096
1097 #if !defined(__mc68000__)
1098         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1099                 hwif->io_ports[IDE_DATA_OFFSET],
1100                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1101                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1102 #else
1103         printk("%s at 0x%08lx on irq %d", hwif->name,
1104                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1105 #endif /* __mc68000__ */
1106         if (match)
1107                 printk(" (%sed with %s)",
1108                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1109         printk("\n");
1110
1111         mutex_unlock(&ide_cfg_mtx);
1112         return 0;
1113 out_unlink:
1114         ide_remove_port_from_hwgroup(hwif);
1115 out_up:
1116         mutex_unlock(&ide_cfg_mtx);
1117         return 1;
1118 }
1119
1120 static int ata_lock(dev_t dev, void *data)
1121 {
1122         /* FIXME: we want to pin hwif down */
1123         return 0;
1124 }
1125
1126 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1127 {
1128         ide_hwif_t *hwif = data;
1129         int unit = *part >> PARTN_BITS;
1130         ide_drive_t *drive = &hwif->drives[unit];
1131         if (!drive->present)
1132                 return NULL;
1133
1134         if (drive->media == ide_disk)
1135                 request_module("ide-disk");
1136         if (drive->scsi)
1137                 request_module("ide-scsi");
1138         if (drive->media == ide_cdrom || drive->media == ide_optical)
1139                 request_module("ide-cd");
1140         if (drive->media == ide_tape)
1141                 request_module("ide-tape");
1142         if (drive->media == ide_floppy)
1143                 request_module("ide-floppy");
1144
1145         return NULL;
1146 }
1147
1148 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1149 {
1150         struct gendisk *p = data;
1151         *part &= (1 << PARTN_BITS) - 1;
1152         return &p->dev.kobj;
1153 }
1154
1155 static int exact_lock(dev_t dev, void *data)
1156 {
1157         struct gendisk *p = data;
1158
1159         if (!get_disk(p))
1160                 return -1;
1161         return 0;
1162 }
1163
1164 void ide_register_region(struct gendisk *disk)
1165 {
1166         blk_register_region(MKDEV(disk->major, disk->first_minor),
1167                             disk->minors, NULL, exact_match, exact_lock, disk);
1168 }
1169
1170 EXPORT_SYMBOL_GPL(ide_register_region);
1171
1172 void ide_unregister_region(struct gendisk *disk)
1173 {
1174         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1175                               disk->minors);
1176 }
1177
1178 EXPORT_SYMBOL_GPL(ide_unregister_region);
1179
1180 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1181 {
1182         ide_hwif_t *hwif = drive->hwif;
1183         unsigned int unit = (drive->select.all >> 4) & 1;
1184
1185         disk->major = hwif->major;
1186         disk->first_minor = unit << PARTN_BITS;
1187         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1188         disk->queue = drive->queue;
1189 }
1190
1191 EXPORT_SYMBOL_GPL(ide_init_disk);
1192
1193 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1194 {
1195         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1196
1197         if (drive == drive->next) {
1198                 /* special case: last drive from hwgroup. */
1199                 BUG_ON(hwgroup->drive != drive);
1200                 hwgroup->drive = NULL;
1201         } else {
1202                 ide_drive_t *walk;
1203
1204                 walk = hwgroup->drive;
1205                 while (walk->next != drive)
1206                         walk = walk->next;
1207                 walk->next = drive->next;
1208                 if (hwgroup->drive == drive) {
1209                         hwgroup->drive = drive->next;
1210                         hwgroup->hwif = hwgroup->drive->hwif;
1211                 }
1212         }
1213         BUG_ON(hwgroup->drive == drive);
1214 }
1215
1216 static void drive_release_dev (struct device *dev)
1217 {
1218         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1219
1220         ide_proc_unregister_device(drive);
1221
1222         spin_lock_irq(&ide_lock);
1223         ide_remove_drive_from_hwgroup(drive);
1224         kfree(drive->id);
1225         drive->id = NULL;
1226         drive->present = 0;
1227         /* Messed up locking ... */
1228         spin_unlock_irq(&ide_lock);
1229         blk_cleanup_queue(drive->queue);
1230         spin_lock_irq(&ide_lock);
1231         drive->queue = NULL;
1232         spin_unlock_irq(&ide_lock);
1233
1234         complete(&drive->gendev_rel_comp);
1235 }
1236
1237 #ifndef ide_default_irq
1238 #define ide_default_irq(irq) 0
1239 #endif
1240
1241 static int hwif_init(ide_hwif_t *hwif)
1242 {
1243         int old_irq;
1244
1245         if (!hwif->irq) {
1246                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1247                 {
1248                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1249                         return 0;
1250                 }
1251         }
1252
1253         if (register_blkdev(hwif->major, hwif->name))
1254                 return 0;
1255
1256         if (!hwif->sg_max_nents)
1257                 hwif->sg_max_nents = PRD_ENTRIES;
1258
1259         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1260                                  GFP_KERNEL);
1261         if (!hwif->sg_table) {
1262                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1263                 goto out;
1264         }
1265
1266         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1267
1268         if (init_irq(hwif) == 0)
1269                 goto done;
1270
1271         old_irq = hwif->irq;
1272         /*
1273          *      It failed to initialise. Find the default IRQ for
1274          *      this port and try that.
1275          */
1276         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1277                 printk("%s: Disabled unable to get IRQ %d.\n",
1278                         hwif->name, old_irq);
1279                 goto out;
1280         }
1281         if (init_irq(hwif)) {
1282                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1283                         hwif->name, old_irq, hwif->irq);
1284                 goto out;
1285         }
1286         printk("%s: probed IRQ %d failed, using default.\n",
1287                 hwif->name, hwif->irq);
1288
1289 done:
1290         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1291                             THIS_MODULE, ata_probe, ata_lock, hwif);
1292         return 1;
1293
1294 out:
1295         unregister_blkdev(hwif->major, hwif->name);
1296         return 0;
1297 }
1298
1299 static void hwif_register_devices(ide_hwif_t *hwif)
1300 {
1301         unsigned int i;
1302
1303         for (i = 0; i < MAX_DRIVES; i++) {
1304                 ide_drive_t *drive = &hwif->drives[i];
1305                 struct device *dev = &drive->gendev;
1306                 int ret;
1307
1308                 if (!drive->present)
1309                         continue;
1310
1311                 ide_add_generic_settings(drive);
1312
1313                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1314                 dev->parent = &hwif->gendev;
1315                 dev->bus = &ide_bus_type;
1316                 dev->driver_data = drive;
1317                 dev->release = drive_release_dev;
1318
1319                 ret = device_register(dev);
1320                 if (ret < 0)
1321                         printk(KERN_WARNING "IDE: %s: device_register error: "
1322                                             "%d\n", __func__, ret);
1323         }
1324 }
1325
1326 static void ide_port_init_devices(ide_hwif_t *hwif)
1327 {
1328         const struct ide_port_ops *port_ops = hwif->port_ops;
1329         int i;
1330
1331         for (i = 0; i < MAX_DRIVES; i++) {
1332                 ide_drive_t *drive = &hwif->drives[i];
1333
1334                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1335                         drive->io_32bit = 1;
1336                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1337                         drive->unmask = 1;
1338                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1339                         drive->no_unmask = 1;
1340                 if ((hwif->host_flags & IDE_HFLAG_NO_AUTOTUNE) == 0)
1341                         drive->autotune = 1;
1342         }
1343
1344         if (port_ops && port_ops->port_init_devs)
1345                 port_ops->port_init_devs(hwif);
1346 }
1347
1348 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1349                           const struct ide_port_info *d)
1350 {
1351         if (d->chipset != ide_etrax100)
1352                 hwif->channel = port;
1353
1354         if (d->chipset)
1355                 hwif->chipset = d->chipset;
1356
1357         if (d->init_iops)
1358                 d->init_iops(hwif);
1359
1360         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0)
1361                 ide_hwif_setup_dma(hwif, d);
1362
1363         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1364             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1365                 hwif->irq = port ? 15 : 14;
1366
1367         hwif->host_flags = d->host_flags;
1368         hwif->pio_mask = d->pio_mask;
1369
1370         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1371         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1372                 hwif->port_ops = d->port_ops;
1373
1374         if ((d->host_flags & IDE_HFLAG_SERIALIZE) && hwif->mate)
1375                 hwif->mate->serialized = hwif->serialized = 1;
1376
1377         hwif->swdma_mask = d->swdma_mask;
1378         hwif->mwdma_mask = d->mwdma_mask;
1379         hwif->ultra_mask = d->udma_mask;
1380
1381         /* reset DMA masks only for SFF-style DMA controllers */
1382         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0 && hwif->dma_base == 0)
1383                 hwif->swdma_mask = hwif->mwdma_mask = hwif->ultra_mask = 0;
1384
1385         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1386                 hwif->rqsize = 256;
1387
1388         /* call chipset specific routine for each enabled port */
1389         if (d->init_hwif)
1390                 d->init_hwif(hwif);
1391 }
1392
1393 static void ide_port_cable_detect(ide_hwif_t *hwif)
1394 {
1395         const struct ide_port_ops *port_ops = hwif->port_ops;
1396
1397         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1398                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1399                         hwif->cbl = port_ops->cable_detect(hwif);
1400         }
1401 }
1402
1403 static ssize_t store_delete_devices(struct device *portdev,
1404                                     struct device_attribute *attr,
1405                                     const char *buf, size_t n)
1406 {
1407         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1408
1409         if (strncmp(buf, "1", n))
1410                 return -EINVAL;
1411
1412         ide_port_unregister_devices(hwif);
1413
1414         return n;
1415 };
1416
1417 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1418
1419 static ssize_t store_scan(struct device *portdev,
1420                           struct device_attribute *attr,
1421                           const char *buf, size_t n)
1422 {
1423         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1424
1425         if (strncmp(buf, "1", n))
1426                 return -EINVAL;
1427
1428         ide_port_unregister_devices(hwif);
1429         ide_port_scan(hwif);
1430
1431         return n;
1432 };
1433
1434 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1435
1436 static struct device_attribute *ide_port_attrs[] = {
1437         &dev_attr_delete_devices,
1438         &dev_attr_scan,
1439         NULL
1440 };
1441
1442 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1443 {
1444         int i, rc;
1445
1446         for (i = 0; ide_port_attrs[i]; i++) {
1447                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1448                 if (rc)
1449                         break;
1450         }
1451
1452         return rc;
1453 }
1454
1455 /**
1456  *      ide_find_port_slot      -       find free ide_hwifs[] slot
1457  *      @d: IDE port info
1458  *
1459  *      Return the new hwif.  If we are out of free slots return NULL.
1460  */
1461
1462 ide_hwif_t *ide_find_port_slot(const struct ide_port_info *d)
1463 {
1464         ide_hwif_t *hwif;
1465         int i;
1466         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1467
1468         /*
1469          * Claim an unassigned slot.
1470          *
1471          * Give preference to claiming other slots before claiming ide0/ide1,
1472          * just in case there's another interface yet-to-be-scanned
1473          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1474          *
1475          * Unless there is a bootable card that does not use the standard
1476          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1477          */
1478         if (bootable) {
1479                 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1480
1481                 for (; i < MAX_HWIFS; i++) {
1482                         hwif = &ide_hwifs[i];
1483                         if (hwif->chipset == ide_unknown)
1484                                 return hwif;
1485                 }
1486         } else {
1487                 for (i = 2; i < MAX_HWIFS; i++) {
1488                         hwif = &ide_hwifs[i];
1489                         if (hwif->chipset == ide_unknown)
1490                                 return hwif;
1491                 }
1492                 for (i = 0; i < 2 && i < MAX_HWIFS; i++) {
1493                         hwif = &ide_hwifs[i];
1494                         if (hwif->chipset == ide_unknown)
1495                                 return hwif;
1496                 }
1497         }
1498
1499         return NULL;
1500 }
1501 EXPORT_SYMBOL_GPL(ide_find_port_slot);
1502
1503 int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
1504 {
1505         ide_hwif_t *hwif, *mate = NULL;
1506         int i, rc = 0;
1507
1508         for (i = 0; i < MAX_HWIFS; i++) {
1509                 if (d == NULL || idx[i] == 0xff) {
1510                         mate = NULL;
1511                         continue;
1512                 }
1513
1514                 hwif = &ide_hwifs[idx[i]];
1515
1516                 if (d->chipset != ide_etrax100 && (i & 1) && mate) {
1517                         hwif->mate = mate;
1518                         mate->mate = hwif;
1519                 }
1520
1521                 mate = (i & 1) ? NULL : hwif;
1522
1523                 ide_init_port(hwif, i & 1, d);
1524                 ide_port_cable_detect(hwif);
1525                 ide_port_init_devices(hwif);
1526         }
1527
1528         for (i = 0; i < MAX_HWIFS; i++) {
1529                 if (idx[i] == 0xff)
1530                         continue;
1531
1532                 hwif = &ide_hwifs[idx[i]];
1533
1534                 if ((hwif->chipset != ide_4drives || !hwif->mate ||
1535                      !hwif->mate->present) && ide_hwif_request_regions(hwif)) {
1536                         printk(KERN_ERR "%s: ports already in use, "
1537                                         "skipping probe\n", hwif->name);
1538                         continue;
1539                 }
1540
1541                 if (ide_probe_port(hwif) < 0) {
1542                         ide_hwif_release_regions(hwif);
1543                         continue;
1544                 }
1545
1546                 hwif->present = 1;
1547
1548                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1549                     !hwif->mate->present)
1550                         ide_register_port(hwif);
1551
1552                 ide_port_tune_devices(hwif);
1553         }
1554
1555         for (i = 0; i < MAX_HWIFS; i++) {
1556                 if (idx[i] == 0xff)
1557                         continue;
1558
1559                 hwif = &ide_hwifs[idx[i]];
1560
1561                 if (!hwif->present)
1562                         continue;
1563
1564                 if (hwif_init(hwif) == 0) {
1565                         printk(KERN_INFO "%s: failed to initialize IDE "
1566                                          "interface\n", hwif->name);
1567                         hwif->present = 0;
1568                         rc = -1;
1569                         continue;
1570                 }
1571
1572                 ide_port_setup_devices(hwif);
1573
1574                 ide_acpi_init(hwif);
1575                 ide_acpi_port_init_devices(hwif);
1576         }
1577
1578         for (i = 0; i < MAX_HWIFS; i++) {
1579                 if (idx[i] == 0xff)
1580                         continue;
1581
1582                 hwif = &ide_hwifs[idx[i]];
1583
1584                 if (hwif->present) {
1585                         if (hwif->chipset == ide_unknown)
1586                                 hwif->chipset = ide_generic;
1587                         hwif_register_devices(hwif);
1588                 }
1589         }
1590
1591         for (i = 0; i < MAX_HWIFS; i++) {
1592                 if (idx[i] == 0xff)
1593                         continue;
1594
1595                 hwif = &ide_hwifs[idx[i]];
1596
1597                 if (hwif->present) {
1598                         ide_sysfs_register_port(hwif);
1599                         ide_proc_register_port(hwif);
1600                         ide_proc_port_register_devices(hwif);
1601                 }
1602         }
1603
1604         return rc;
1605 }
1606 EXPORT_SYMBOL_GPL(ide_device_add_all);
1607
1608 int ide_device_add(u8 idx[4], const struct ide_port_info *d)
1609 {
1610         u8 idx_all[MAX_HWIFS];
1611         int i;
1612
1613         for (i = 0; i < MAX_HWIFS; i++)
1614                 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1615
1616         return ide_device_add_all(idx_all, d);
1617 }
1618 EXPORT_SYMBOL_GPL(ide_device_add);
1619
1620 void ide_port_scan(ide_hwif_t *hwif)
1621 {
1622         ide_port_cable_detect(hwif);
1623         ide_port_init_devices(hwif);
1624
1625         if (ide_probe_port(hwif) < 0)
1626                 return;
1627
1628         hwif->present = 1;
1629
1630         ide_port_tune_devices(hwif);
1631         ide_acpi_port_init_devices(hwif);
1632         ide_port_setup_devices(hwif);
1633         hwif_register_devices(hwif);
1634         ide_proc_port_register_devices(hwif);
1635 }
1636 EXPORT_SYMBOL_GPL(ide_port_scan);