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