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