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