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