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 (IDE_CONTROL_REG) {
 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, IDE_FEATURE_REG);
 293
 294         /* ask drive for ID */
 295         hwif->OUTB(cmd, IDE_COMMAND_REG);
 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 (IDE_CONTROL_REG) {
 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(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 449                 if (drive->select.b.unit != 0) {
 450                         /* exit with drive0 selected */
 451                         SELECT_DRIVE(&hwif->drives[0]);
 452                         /* allow BUSY_STAT to assert & clear */
 453                         msleep(50);
 454                 }
 455                 /* no i/f present: mmm.. this should be a 4 -ml */
 456                 return 3;
 457         }
 458
 459         stat = ide_read_status(drive);
 460
 461         if (OK_STAT(stat, READY_STAT, BUSY_STAT) ||
 462             drive->present || cmd == WIN_PIDENTIFY) {
 463                 /* send cmd and wait */
 464                 if ((rc = try_to_identify(drive, cmd))) {
 465                         /* failed: try again */
 466                         rc = try_to_identify(drive,cmd);
 467                 }
 468
 469                 stat = ide_read_status(drive);
 470
 471                 if (stat == (BUSY_STAT | READY_STAT))
 472                         return 4;
 473
 474                 if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 475                         ((drive->autotune == IDE_TUNE_DEFAULT) ||
 476                         (drive->autotune == IDE_TUNE_AUTO))) {
 477                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 478                                         "resetting drive\n", drive->name, stat);
 479                         msleep(50);
 480                         hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 481                         msleep(50);
 482                         hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 483                         (void)ide_busy_sleep(hwif);
 484                         rc = try_to_identify(drive, cmd);
 485                 }
 486
 487                 /* ensure drive IRQ is clear */
 488                 stat = ide_read_status(drive);
 489
 490                 if (rc == 1)
 491                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 492                                         drive->name, stat);
 493         } else {
 494                 /* not present or maybe ATAPI */
 495                 rc = 3;
 496         }
 497         if (drive->select.b.unit != 0) {
 498                 /* exit with drive0 selected */
 499                 SELECT_DRIVE(&hwif->drives[0]);
 500                 msleep(50);
 501                 /* ensure drive irq is clear */
 502                 (void)ide_read_status(drive);
 503         }
 504         return rc;
 505 }
 506
 507 /*
 508  *
 509  */
 510 static void enable_nest (ide_drive_t *drive)
 511 {
 512         ide_hwif_t *hwif = HWIF(drive);
 513         u8 stat;
 514
 515         printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 516         SELECT_DRIVE(drive);
 517         msleep(50);
 518         hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 519
 520         if (ide_busy_sleep(hwif)) {
 521                 printk(KERN_CONT "failed (timeout)\n");
 522                 return;
 523         }
 524
 525         msleep(50);
 526
 527         stat = ide_read_status(drive);
 528
 529         if (!OK_STAT(stat, 0, BAD_STAT))
 530                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 531         else
 532                 printk(KERN_CONT "success\n");
 533
 534         /* if !(success||timed-out) */
 535         if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 536                 /* look for ATAPI device */
 537                 (void) do_probe(drive, WIN_PIDENTIFY);
 538         }
 539 }
 540
 541 /**
 542  *      probe_for_drives        -       upper level drive probe
 543  *      @drive: drive to probe for
 544  *
 545  *      probe_for_drive() tests for existence of a given drive using do_probe()
 546  *      and presents things to the user as needed.
 547  *
 548  *      Returns:        0  no device was found
 549  *                      1  device was found (note: drive->present might
 550  *                         still be 0)
 551  */
 552
 553 static inline u8 probe_for_drive (ide_drive_t *drive)
 554 {
 555         /*
 556          *      In order to keep things simple we have an id
 557          *      block for all drives at all times. If the device
 558          *      is pre ATA or refuses ATA/ATAPI identify we
 559          *      will add faked data to this.
 560          *
 561          *      Also note that 0 everywhere means "can't do X"
 562          */
 563
 564         drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 565         drive->id_read = 0;
 566         if(drive->id == NULL)
 567         {
 568                 printk(KERN_ERR "ide: out of memory for id data.\n");
 569                 return 0;
 570         }
 571         strcpy(drive->id->model, "UNKNOWN");
 572
 573         /* skip probing? */
 574         if (!drive->noprobe)
 575         {
 576                 /* if !(success||timed-out) */
 577                 if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 578                         /* look for ATAPI device */
 579                         (void) do_probe(drive, WIN_PIDENTIFY);
 580                 }
 581                 if (!drive->present)
 582                         /* drive not found */
 583                         return 0;
 584                 if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 585                         enable_nest(drive);
 586
 587                 /* identification failed? */
 588                 if (!drive->id_read) {
 589                         if (drive->media == ide_disk) {
 590                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 591                                         drive->name, drive->cyl,
 592                                         drive->head, drive->sect);
 593                         } else if (drive->media == ide_cdrom) {
 594                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 595                         } else {
 596                                 /* nuke it */
 597                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 598                                 drive->present = 0;
 599                         }
 600                 }
 601                 /* drive was found */
 602         }
 603         if(!drive->present)
 604                 return 0;
 605         /* The drive wasn't being helpful. Add generic info only */
 606         if (drive->id_read == 0) {
 607                 generic_id(drive);
 608                 return 1;
 609         }
 610
 611         if (drive->media == ide_disk) {
 612                 ide_disk_init_chs(drive);
 613                 ide_disk_init_mult_count(drive);
 614         }
 615
 616         return drive->present;
 617 }
 618
 619 static void hwif_release_dev (struct device *dev)
 620 {
 621         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 622
 623         complete(&hwif->gendev_rel_comp);
 624 }
 625
 626 static void ide_register_port(ide_hwif_t *hwif)
 627 {
 628         int ret;
 629
 630         /* register with global device tree */
 631         strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 632         hwif->gendev.driver_data = hwif;
 633         if (hwif->gendev.parent == NULL) {
 634                 if (hwif->dev)
 635                         hwif->gendev.parent = hwif->dev;
 636                 else
 637                         /* Would like to do = &device_legacy */
 638                         hwif->gendev.parent = NULL;
 639         }
 640         hwif->gendev.release = hwif_release_dev;
 641         ret = device_register(&hwif->gendev);
 642         if (ret < 0)
 643                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 644                         __FUNCTION__, ret);
 645 }
 646
 647 /**
 648  *      ide_port_wait_ready     -       wait for port to become ready
 649  *      @hwif: IDE port
 650  *
 651  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 652  *      platforms.  Typical cases are:
 653  *
 654  *      - The firmware hard reset the disk before booting the kernel,
 655  *        the drive is still doing it's poweron-reset sequence, that
 656  *        can take up to 30 seconds.
 657  *
 658  *      - The firmware does nothing (or no firmware), the device is
 659  *        still in POST state (same as above actually).
 660  *
 661  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 662  *        their reset sequence even when they are non-selected slave
 663  *        devices, thus preventing discovery of the main HD.
 664  *
 665  *      Doing this wait-for-non-busy should not harm any existing
 666  *      configuration and fix some issues like the above.
 667  *
 668  *      BenH.
 669  *
 670  *      Returns 0 on success, error code (< 0) otherwise.
 671  */
 672
 673 static int ide_port_wait_ready(ide_hwif_t *hwif)
 674 {
 675         int unit, rc;
 676
 677         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 678
 679         /* Let HW settle down a bit from whatever init state we
 680          * come from */
 681         mdelay(2);
 682
 683         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 684          * I know of at least one disk who takes 31 seconds, I use 35
 685          * here to be safe
 686          */
 687         rc = ide_wait_not_busy(hwif, 35000);
 688         if (rc)
 689                 return rc;
 690
 691         /* Now make sure both master & slave are ready */
 692         for (unit = 0; unit < MAX_DRIVES; unit++) {
 693                 ide_drive_t *drive = &hwif->drives[unit];
 694
 695                 /* Ignore disks that we will not probe for later. */
 696                 if (!drive->noprobe || drive->present) {
 697                         SELECT_DRIVE(drive);
 698                         ide_set_irq(drive, 1);
 699                         mdelay(2);
 700                         rc = ide_wait_not_busy(hwif, 35000);
 701                         if (rc)
 702                                 goto out;
 703                 } else
 704                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 705                                           drive->name);
 706         }
 707 out:
 708         /* Exit function with master reselected (let's be sane) */
 709         if (unit)
 710                 SELECT_DRIVE(&hwif->drives[0]);
 711
 712         return rc;
 713 }
 714
 715 /**
 716  *      ide_undecoded_slave     -       look for bad CF adapters
 717  *      @drive1: drive
 718  *
 719  *      Analyse the drives on the interface and attempt to decide if we
 720  *      have the same drive viewed twice. This occurs with crap CF adapters
 721  *      and PCMCIA sometimes.
 722  */
 723
 724 void ide_undecoded_slave(ide_drive_t *drive1)
 725 {
 726         ide_drive_t *drive0 = &drive1->hwif->drives[0];
 727
 728         if ((drive1->dn & 1) == 0 || drive0->present == 0)
 729                 return;
 730
 731         /* If the models don't match they are not the same product */
 732         if (strcmp(drive0->id->model, drive1->id->model))
 733                 return;
 734
 735         /* Serial numbers do not match */
 736         if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 737                 return;
 738
 739         /* No serial number, thankfully very rare for CF */
 740         if (drive0->id->serial_no[0] == 0)
 741                 return;
 742
 743         /* Appears to be an IDE flash adapter with decode bugs */
 744         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 745
 746         drive1->present = 0;
 747 }
 748
 749 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 750
 751 static int ide_probe_port(ide_hwif_t *hwif)
 752 {
 753         unsigned long flags;
 754         unsigned int irqd;
 755         int unit, rc = -ENODEV;
 756
 757         BUG_ON(hwif->present);
 758
 759         if (hwif->noprobe)
 760                 return -EACCES;
 761
 762         /*
 763          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 764          * we'll install our IRQ driver much later...
 765          */
 766         irqd = hwif->irq;
 767         if (irqd)
 768                 disable_irq(hwif->irq);
 769
 770         local_irq_set(flags);
 771
 772         if (ide_port_wait_ready(hwif) == -EBUSY)
 773                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 774
 775         /*
 776          * Need to probe slave device first to make it release PDIAG-.
 777          */
 778         for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
 779                 ide_drive_t *drive = &hwif->drives[unit];
 780                 drive->dn = (hwif->channel ? 2 : 0) + unit;
 781                 (void) probe_for_drive(drive);
 782                 if (drive->present)
 783                         rc = 0;
 784         }
 785         if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 786                 printk(KERN_WARNING "%s: reset\n", hwif->name);
 787                 hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 788                 udelay(10);
 789                 hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 790                 (void)ide_busy_sleep(hwif);
 791         }
 792         local_irq_restore(flags);
 793         /*
 794          * Use cached IRQ number. It might be (and is...) changed by probe
 795          * code above
 796          */
 797         if (irqd)
 798                 enable_irq(irqd);
 799
 800         return rc;
 801 }
 802
 803 static void ide_port_tune_devices(ide_hwif_t *hwif)
 804 {
 805         int unit;
 806
 807         for (unit = 0; unit < MAX_DRIVES; unit++) {
 808                 ide_drive_t *drive = &hwif->drives[unit];
 809
 810                 if (drive->present && hwif->quirkproc)
 811                         hwif->quirkproc(drive);
 812         }
 813
 814         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 815                 ide_drive_t *drive = &hwif->drives[unit];
 816
 817                 if (drive->present) {
 818                         if (drive->autotune == IDE_TUNE_AUTO)
 819                                 ide_set_max_pio(drive);
 820
 821                         if (drive->autotune != IDE_TUNE_DEFAULT &&
 822                             drive->autotune != IDE_TUNE_AUTO)
 823                                 continue;
 824
 825                         drive->nice1 = 1;
 826
 827                         if (hwif->dma_host_set)
 828                                 ide_set_dma(drive);
 829                 }
 830         }
 831
 832         for (unit = 0; unit < MAX_DRIVES; ++unit) {
 833                 ide_drive_t *drive = &hwif->drives[unit];
 834
 835                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
 836                         drive->no_io_32bit = 1;
 837                 else
 838                         drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 839         }
 840 }
 841
 842 #if MAX_HWIFS > 1
 843 /*
 844  * save_match() is used to simplify logic in init_irq() below.
 845  *
 846  * A loophole here is that we may not know about a particular
 847  * hwif's irq until after that hwif is actually probed/initialized..
 848  * This could be a problem for the case where an hwif is on a
 849  * dual interface that requires serialization (eg. cmd640) and another
 850  * hwif using one of the same irqs is initialized beforehand.
 851  *
 852  * This routine detects and reports such situations, but does not fix them.
 853  */
 854 static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 855 {
 856         ide_hwif_t *m = *match;
 857
 858         if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 859                 if (!new->hwgroup)
 860                         return;
 861                 printk("%s: potential irq problem with %s and %s\n",
 862                         hwif->name, new->name, m->name);
 863         }
 864         if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 865                 *match = new;
 866 }
 867 #endif /* MAX_HWIFS > 1 */
 868
 869 /*
 870  * init request queue
 871  */
 872 static int ide_init_queue(ide_drive_t *drive)
 873 {
 874         struct request_queue *q;
 875         ide_hwif_t *hwif = HWIF(drive);
 876         int max_sectors = 256;
 877         int max_sg_entries = PRD_ENTRIES;
 878
 879         /*
 880          *      Our default set up assumes the normal IDE case,
 881          *      that is 64K segmenting, standard PRD setup
 882          *      and LBA28. Some drivers then impose their own
 883          *      limits and LBA48 we could raise it but as yet
 884          *      do not.
 885          */
 886
 887         q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 888         if (!q)
 889                 return 1;
 890
 891         q->queuedata = drive;
 892         blk_queue_segment_boundary(q, 0xffff);
 893
 894         if (hwif->rqsize < max_sectors)
 895                 max_sectors = hwif->rqsize;
 896         blk_queue_max_sectors(q, max_sectors);
 897
 898 #ifdef CONFIG_PCI
 899         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 900          * creates segments that don't completely match our boundary
 901          * requirements and thus need to be broken up again. Because it
 902          * doesn't align properly either, we may actually have to break up
 903          * to more segments than what was we got in the first place, a max
 904          * worst case is twice as many.
 905          * This will be fixed once we teach pci_map_sg() about our boundary
 906          * requirements, hopefully soon. *FIXME*
 907          */
 908         if (!PCI_DMA_BUS_IS_PHYS)
 909                 max_sg_entries >>= 1;
 910 #endif /* CONFIG_PCI */
 911
 912         blk_queue_max_hw_segments(q, max_sg_entries);
 913         blk_queue_max_phys_segments(q, max_sg_entries);
 914
 915         /* assign drive queue */
 916         drive->queue = q;
 917
 918         /* needs drive->queue to be set */
 919         ide_toggle_bounce(drive, 1);
 920
 921         return 0;
 922 }
 923
 924 static void ide_add_drive_to_hwgroup(ide_drive_t *drive)
 925 {
 926         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
 927
 928         spin_lock_irq(&ide_lock);
 929         if (!hwgroup->drive) {
 930                 /* first drive for hwgroup. */
 931                 drive->next = drive;
 932                 hwgroup->drive = drive;
 933                 hwgroup->hwif = HWIF(hwgroup->drive);
 934         } else {
 935                 drive->next = hwgroup->drive->next;
 936                 hwgroup->drive->next = drive;
 937         }
 938         spin_unlock_irq(&ide_lock);
 939 }
 940
 941 /*
 942  * For any present drive:
 943  * - allocate the block device queue
 944  * - link drive into the hwgroup
 945  */
 946 static void ide_port_setup_devices(ide_hwif_t *hwif)
 947 {
 948         int i;
 949
 950         for (i = 0; i < MAX_DRIVES; i++) {
 951                 ide_drive_t *drive = &hwif->drives[i];
 952
 953                 if (!drive->present)
 954                         continue;
 955
 956                 if (ide_init_queue(drive)) {
 957                         printk(KERN_ERR "ide: failed to init %s\n",
 958                                         drive->name);
 959                         continue;
 960                 }
 961
 962                 ide_add_drive_to_hwgroup(drive);
 963         }
 964 }
 965
 966 /*
 967  * This routine sets up the irq for an ide interface, and creates a new
 968  * hwgroup for the irq/hwif if none was previously assigned.
 969  *
 970  * Much of the code is for correctly detecting/handling irq sharing
 971  * and irq serialization situations.  This is somewhat complex because
 972  * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 973  */
 974 static int init_irq (ide_hwif_t *hwif)
 975 {
 976         unsigned int index;
 977         ide_hwgroup_t *hwgroup;
 978         ide_hwif_t *match = NULL;
 979
 980
 981         BUG_ON(in_interrupt());
 982         BUG_ON(irqs_disabled());
 983         BUG_ON(hwif == NULL);
 984
 985         mutex_lock(&ide_cfg_mtx);
 986         hwif->hwgroup = NULL;
 987 #if MAX_HWIFS > 1
 988         /*
 989          * Group up with any other hwifs that share our irq(s).
 990          */
 991         for (index = 0; index < MAX_HWIFS; index++) {
 992                 ide_hwif_t *h = &ide_hwifs[index];
 993                 if (h->hwgroup) {  /* scan only initialized hwif's */
 994                         if (hwif->irq == h->irq) {
 995                                 hwif->sharing_irq = h->sharing_irq = 1;
 996                                 if (hwif->chipset != ide_pci ||
 997                                     h->chipset != ide_pci) {
 998                                         save_match(hwif, h, &match);
 999                                 }
1000                         }
1001                         if (hwif->serialized) {
1002                                 if (hwif->mate && hwif->mate->irq == h->irq)
1003                                         save_match(hwif, h, &match);
1004                         }
1005                         if (h->serialized) {
1006                                 if (h->mate && hwif->irq == h->mate->irq)
1007                                         save_match(hwif, h, &match);
1008                         }
1009                 }
1010         }
1011 #endif /* MAX_HWIFS > 1 */
1012         /*
1013          * If we are still without a hwgroup, then form a new one
1014          */
1015         if (match) {
1016                 hwgroup = match->hwgroup;
1017                 hwif->hwgroup = hwgroup;
1018                 /*
1019                  * Link us into the hwgroup.
1020                  * This must be done early, do ensure that unexpected_intr
1021                  * can find the hwif and prevent irq storms.
1022                  * No drives are attached to the new hwif, choose_drive
1023                  * can't do anything stupid (yet).
1024                  * Add ourself as the 2nd entry to the hwgroup->hwif
1025                  * linked list, the first entry is the hwif that owns
1026                  * hwgroup->handler - do not change that.
1027                  */
1028                 spin_lock_irq(&ide_lock);
1029                 hwif->next = hwgroup->hwif->next;
1030                 hwgroup->hwif->next = hwif;
1031                 BUG_ON(hwif->next == hwif);
1032                 spin_unlock_irq(&ide_lock);
1033         } else {
1034                 hwgroup = kmalloc_node(sizeof(*hwgroup), GFP_KERNEL|__GFP_ZERO,
1035                                        hwif_to_node(hwif));
1036                 if (hwgroup == NULL)
1037                         goto out_up;
1038
1039                 hwif->hwgroup = hwgroup;
1040                 hwgroup->hwif = hwif->next = hwif;
1041
1042                 init_timer(&hwgroup->timer);
1043                 hwgroup->timer.function = &ide_timer_expiry;
1044                 hwgroup->timer.data = (unsigned long) hwgroup;
1045         }
1046
1047         /*
1048          * Allocate the irq, if not already obtained for another hwif
1049          */
1050         if (!match || match->irq != hwif->irq) {
1051                 int sa = 0;
1052 #if defined(__mc68000__)
1053                 sa = IRQF_SHARED;
1054 #endif /* __mc68000__ */
1055
1056                 if (IDE_CHIPSET_IS_PCI(hwif->chipset))
1057                         sa = IRQF_SHARED;
1058
1059                 if (hwif->io_ports[IDE_CONTROL_OFFSET])
1060                         /* clear nIEN */
1061                         hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1062
1063                 if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1064                         goto out_unlink;
1065         }
1066
1067         if (!hwif->rqsize) {
1068                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1069                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1070                         hwif->rqsize = 256;
1071                 else
1072                         hwif->rqsize = 65536;
1073         }
1074
1075 #if !defined(__mc68000__)
1076         printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1077                 hwif->io_ports[IDE_DATA_OFFSET],
1078                 hwif->io_ports[IDE_DATA_OFFSET]+7,
1079                 hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1080 #else
1081         printk("%s at 0x%08lx on irq %d", hwif->name,
1082                 hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1083 #endif /* __mc68000__ */
1084         if (match)
1085                 printk(" (%sed with %s)",
1086                         hwif->sharing_irq ? "shar" : "serializ", match->name);
1087         printk("\n");
1088
1089         ide_port_setup_devices(hwif);
1090
1091         mutex_unlock(&ide_cfg_mtx);
1092         return 0;
1093 out_unlink:
1094         ide_remove_port_from_hwgroup(hwif);
1095 out_up:
1096         mutex_unlock(&ide_cfg_mtx);
1097         return 1;
1098 }
1099
1100 static int ata_lock(dev_t dev, void *data)
1101 {
1102         /* FIXME: we want to pin hwif down */
1103         return 0;
1104 }
1105
1106 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1107 {
1108         ide_hwif_t *hwif = data;
1109         int unit = *part >> PARTN_BITS;
1110         ide_drive_t *drive = &hwif->drives[unit];
1111         if (!drive->present)
1112                 return NULL;
1113
1114         if (drive->media == ide_disk)
1115                 request_module("ide-disk");
1116         if (drive->scsi)
1117                 request_module("ide-scsi");
1118         if (drive->media == ide_cdrom || drive->media == ide_optical)
1119                 request_module("ide-cd");
1120         if (drive->media == ide_tape)
1121                 request_module("ide-tape");
1122         if (drive->media == ide_floppy)
1123                 request_module("ide-floppy");
1124
1125         return NULL;
1126 }
1127
1128 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1129 {
1130         struct gendisk *p = data;
1131         *part &= (1 << PARTN_BITS) - 1;
1132         return &p->dev.kobj;
1133 }
1134
1135 static int exact_lock(dev_t dev, void *data)
1136 {
1137         struct gendisk *p = data;
1138
1139         if (!get_disk(p))
1140                 return -1;
1141         return 0;
1142 }
1143
1144 void ide_register_region(struct gendisk *disk)
1145 {
1146         blk_register_region(MKDEV(disk->major, disk->first_minor),
1147                             disk->minors, NULL, exact_match, exact_lock, disk);
1148 }
1149
1150 EXPORT_SYMBOL_GPL(ide_register_region);
1151
1152 void ide_unregister_region(struct gendisk *disk)
1153 {
1154         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1155                               disk->minors);
1156 }
1157
1158 EXPORT_SYMBOL_GPL(ide_unregister_region);
1159
1160 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1161 {
1162         ide_hwif_t *hwif = drive->hwif;
1163         unsigned int unit = (drive->select.all >> 4) & 1;
1164
1165         disk->major = hwif->major;
1166         disk->first_minor = unit << PARTN_BITS;
1167         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1168         disk->queue = drive->queue;
1169 }
1170
1171 EXPORT_SYMBOL_GPL(ide_init_disk);
1172
1173 static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1174 {
1175         ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1176
1177         if (drive == drive->next) {
1178                 /* special case: last drive from hwgroup. */
1179                 BUG_ON(hwgroup->drive != drive);
1180                 hwgroup->drive = NULL;
1181         } else {
1182                 ide_drive_t *walk;
1183
1184                 walk = hwgroup->drive;
1185                 while (walk->next != drive)
1186                         walk = walk->next;
1187                 walk->next = drive->next;
1188                 if (hwgroup->drive == drive) {
1189                         hwgroup->drive = drive->next;
1190                         hwgroup->hwif = hwgroup->drive->hwif;
1191                 }
1192         }
1193         BUG_ON(hwgroup->drive == drive);
1194 }
1195
1196 static void drive_release_dev (struct device *dev)
1197 {
1198         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1199
1200         spin_lock_irq(&ide_lock);
1201         ide_remove_drive_from_hwgroup(drive);
1202         kfree(drive->id);
1203         drive->id = NULL;
1204         drive->present = 0;
1205         /* Messed up locking ... */
1206         spin_unlock_irq(&ide_lock);
1207         blk_cleanup_queue(drive->queue);
1208         spin_lock_irq(&ide_lock);
1209         drive->queue = NULL;
1210         spin_unlock_irq(&ide_lock);
1211
1212         complete(&drive->gendev_rel_comp);
1213 }
1214
1215 static int hwif_init(ide_hwif_t *hwif)
1216 {
1217         int old_irq;
1218
1219         if (!hwif->irq) {
1220                 if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1221                 {
1222                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1223                         return 0;
1224                 }
1225         }
1226 #ifdef CONFIG_BLK_DEV_HD
1227         if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1228                 printk("%s: CANNOT SHARE IRQ WITH OLD "
1229                         "HARDDISK DRIVER (hd.c)\n", hwif->name);
1230                 return 0;
1231         }
1232 #endif /* CONFIG_BLK_DEV_HD */
1233
1234         if (register_blkdev(hwif->major, hwif->name))
1235                 return 0;
1236
1237         if (!hwif->sg_max_nents)
1238                 hwif->sg_max_nents = PRD_ENTRIES;
1239
1240         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1241                                  GFP_KERNEL);
1242         if (!hwif->sg_table) {
1243                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1244                 goto out;
1245         }
1246
1247         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1248
1249         if (init_irq(hwif) == 0)
1250                 goto done;
1251
1252         old_irq = hwif->irq;
1253         /*
1254          *      It failed to initialise. Find the default IRQ for
1255          *      this port and try that.
1256          */
1257         if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1258                 printk("%s: Disabled unable to get IRQ %d.\n",
1259                         hwif->name, old_irq);
1260                 goto out;
1261         }
1262         if (init_irq(hwif)) {
1263                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1264                         hwif->name, old_irq, hwif->irq);
1265                 goto out;
1266         }
1267         printk("%s: probed IRQ %d failed, using default.\n",
1268                 hwif->name, hwif->irq);
1269
1270 done:
1271         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1272                             THIS_MODULE, ata_probe, ata_lock, hwif);
1273         return 1;
1274
1275 out:
1276         unregister_blkdev(hwif->major, hwif->name);
1277         return 0;
1278 }
1279
1280 static void hwif_register_devices(ide_hwif_t *hwif)
1281 {
1282         unsigned int i;
1283
1284         for (i = 0; i < MAX_DRIVES; i++) {
1285                 ide_drive_t *drive = &hwif->drives[i];
1286                 struct device *dev = &drive->gendev;
1287                 int ret;
1288
1289                 if (!drive->present)
1290                         continue;
1291
1292                 ide_add_generic_settings(drive);
1293
1294                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1295                 dev->parent = &hwif->gendev;
1296                 dev->bus = &ide_bus_type;
1297                 dev->driver_data = drive;
1298                 dev->release = drive_release_dev;
1299
1300                 ret = device_register(dev);
1301                 if (ret < 0)
1302                         printk(KERN_WARNING "IDE: %s: device_register error: "
1303                                             "%d\n", __func__, ret);
1304         }
1305 }
1306
1307 static void ide_port_init_devices(ide_hwif_t *hwif)
1308 {
1309         int i;
1310
1311         for (i = 0; i < MAX_DRIVES; i++) {
1312                 ide_drive_t *drive = &hwif->drives[i];
1313
1314                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1315                         drive->io_32bit = 1;
1316                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1317                         drive->unmask = 1;
1318                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1319                         drive->no_unmask = 1;
1320                 if ((hwif->host_flags & IDE_HFLAG_NO_AUTOTUNE) == 0)
1321                         drive->autotune = 1;
1322         }
1323
1324         if (hwif->port_init_devs)
1325                 hwif->port_init_devs(hwif);
1326 }
1327
1328 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1329                           const struct ide_port_info *d)
1330 {
1331         if (d->chipset != ide_etrax100)
1332                 hwif->channel = port;
1333
1334         if (d->chipset)
1335                 hwif->chipset = d->chipset;
1336
1337         if (d->init_iops)
1338                 d->init_iops(hwif);
1339
1340         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0)
1341                 ide_hwif_setup_dma(hwif, d);
1342
1343         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1344             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1345                 hwif->irq = port ? 15 : 14;
1346
1347         hwif->host_flags = d->host_flags;
1348         hwif->pio_mask = d->pio_mask;
1349
1350         if ((d->host_flags & IDE_HFLAG_SERIALIZE) && hwif->mate)
1351                 hwif->mate->serialized = hwif->serialized = 1;
1352
1353         hwif->swdma_mask = d->swdma_mask;
1354         hwif->mwdma_mask = d->mwdma_mask;
1355         hwif->ultra_mask = d->udma_mask;
1356
1357         /* reset DMA masks only for SFF-style DMA controllers */
1358         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0 && hwif->dma_base == 0)
1359                 hwif->swdma_mask = hwif->mwdma_mask = hwif->ultra_mask = 0;
1360
1361         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1362                 hwif->rqsize = 256;
1363
1364         /* call chipset specific routine for each enabled port */
1365         if (d->init_hwif)
1366                 d->init_hwif(hwif);
1367
1368         if (hwif->cable_detect && (hwif->ultra_mask & 0x78)) {
1369                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1370                         hwif->cbl = hwif->cable_detect(hwif);
1371         }
1372 }
1373
1374 int ide_device_add_all(u8 *idx, const struct ide_port_info *d)
1375 {
1376         ide_hwif_t *hwif, *mate = NULL;
1377         int i, rc = 0;
1378
1379         for (i = 0; i < MAX_HWIFS; i++) {
1380                 if (d == NULL || idx[i] == 0xff) {
1381                         mate = NULL;
1382                         continue;
1383                 }
1384
1385                 hwif = &ide_hwifs[idx[i]];
1386
1387                 if (d->chipset != ide_etrax100 && (i & 1) && mate) {
1388                         hwif->mate = mate;
1389                         mate->mate = hwif;
1390                 }
1391
1392                 mate = (i & 1) ? NULL : hwif;
1393
1394                 ide_init_port(hwif, i & 1, d);
1395                 ide_port_init_devices(hwif);
1396         }
1397
1398         for (i = 0; i < MAX_HWIFS; i++) {
1399                 if (idx[i] == 0xff)
1400                         continue;
1401
1402                 hwif = &ide_hwifs[idx[i]];
1403
1404                 if ((hwif->chipset != ide_4drives || !hwif->mate ||
1405                      !hwif->mate->present) && ide_hwif_request_regions(hwif)) {
1406                         printk(KERN_ERR "%s: ports already in use, "
1407                                         "skipping probe\n", hwif->name);
1408                         continue;
1409                 }
1410
1411                 if (ide_probe_port(hwif) < 0) {
1412                         ide_hwif_release_regions(hwif);
1413                         continue;
1414                 }
1415
1416                 hwif->present = 1;
1417
1418                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1419                     !hwif->mate->present)
1420                         ide_register_port(hwif);
1421
1422                 ide_port_tune_devices(hwif);
1423         }
1424
1425         for (i = 0; i < MAX_HWIFS; i++) {
1426                 if (idx[i] == 0xff)
1427                         continue;
1428
1429                 hwif = &ide_hwifs[idx[i]];
1430
1431                 if (!hwif->present)
1432                         continue;
1433
1434                 if (hwif_init(hwif) == 0) {
1435                         printk(KERN_INFO "%s: failed to initialize IDE "
1436                                          "interface\n", hwif->name);
1437                         hwif->present = 0;
1438                         rc = -1;
1439                         continue;
1440                 }
1441
1442                 ide_acpi_init(hwif);
1443                 ide_acpi_port_init_devices(hwif);
1444         }
1445
1446         for (i = 0; i < MAX_HWIFS; i++) {
1447                 if (idx[i] == 0xff)
1448                         continue;
1449
1450                 hwif = &ide_hwifs[idx[i]];
1451
1452                 if (hwif->present) {
1453                         if (hwif->chipset == ide_unknown ||
1454                             hwif->chipset == ide_forced)
1455                                 hwif->chipset = ide_generic;
1456                         hwif_register_devices(hwif);
1457                 }
1458         }
1459
1460         for (i = 0; i < MAX_HWIFS; i++) {
1461                 if (idx[i] == 0xff)
1462                         continue;
1463
1464                 hwif = &ide_hwifs[idx[i]];
1465
1466                 if (hwif->present) {
1467                         ide_proc_register_port(hwif);
1468                         ide_proc_port_register_devices(hwif);
1469                 }
1470         }
1471
1472         return rc;
1473 }
1474 EXPORT_SYMBOL_GPL(ide_device_add_all);
1475
1476 int ide_device_add(u8 idx[4], const struct ide_port_info *d)
1477 {
1478         u8 idx_all[MAX_HWIFS];
1479         int i;
1480
1481         for (i = 0; i < MAX_HWIFS; i++)
1482                 idx_all[i] = (i < 4) ? idx[i] : 0xff;
1483
1484         return ide_device_add_all(idx_all, d);
1485 }
1486 EXPORT_SYMBOL_GPL(ide_device_add);