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

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