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(drive, cmd, 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                         hwif->OUTB(drive->select.all, io_ports->device_addr);
 482                         msleep(50);
 483                         hwif->OUTBSYNC(drive, 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(drive, 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         get_device(&hwif->gendev);
 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->OUTB(0x08, 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 #ifndef ide_default_irq
1224 #define ide_default_irq(irq) 0
1225 #endif
1226
1227 static int hwif_init(ide_hwif_t *hwif)
1228 {
1229         int old_irq;
1230
1231         if (!hwif->irq) {
1232                 hwif->irq = ide_default_irq(hwif->io_ports.data_addr);
1233                 if (!hwif->irq) {
1234                         printk("%s: DISABLED, NO IRQ\n", hwif->name);
1235                         return 0;
1236                 }
1237         }
1238
1239         if (register_blkdev(hwif->major, hwif->name))
1240                 return 0;
1241
1242         if (!hwif->sg_max_nents)
1243                 hwif->sg_max_nents = PRD_ENTRIES;
1244
1245         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1246                                  GFP_KERNEL);
1247         if (!hwif->sg_table) {
1248                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1249                 goto out;
1250         }
1251
1252         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1253
1254         if (init_irq(hwif) == 0)
1255                 goto done;
1256
1257         old_irq = hwif->irq;
1258         /*
1259          *      It failed to initialise. Find the default IRQ for
1260          *      this port and try that.
1261          */
1262         hwif->irq = ide_default_irq(hwif->io_ports.data_addr);
1263         if (!hwif->irq) {
1264                 printk("%s: Disabled unable to get IRQ %d.\n",
1265                         hwif->name, old_irq);
1266                 goto out;
1267         }
1268         if (init_irq(hwif)) {
1269                 printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1270                         hwif->name, old_irq, hwif->irq);
1271                 goto out;
1272         }
1273         printk("%s: probed IRQ %d failed, using default.\n",
1274                 hwif->name, hwif->irq);
1275
1276 done:
1277         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1278                             THIS_MODULE, ata_probe, ata_lock, hwif);
1279         return 1;
1280
1281 out:
1282         unregister_blkdev(hwif->major, hwif->name);
1283         return 0;
1284 }
1285
1286 static void hwif_register_devices(ide_hwif_t *hwif)
1287 {
1288         unsigned int i;
1289
1290         for (i = 0; i < MAX_DRIVES; i++) {
1291                 ide_drive_t *drive = &hwif->drives[i];
1292                 struct device *dev = &drive->gendev;
1293                 int ret;
1294
1295                 if (!drive->present)
1296                         continue;
1297
1298                 ide_add_generic_settings(drive);
1299
1300                 snprintf(dev->bus_id, BUS_ID_SIZE, "%u.%u", hwif->index, i);
1301                 dev->parent = &hwif->gendev;
1302                 dev->bus = &ide_bus_type;
1303                 dev->driver_data = drive;
1304                 dev->release = drive_release_dev;
1305
1306                 ret = device_register(dev);
1307                 if (ret < 0)
1308                         printk(KERN_WARNING "IDE: %s: device_register error: "
1309                                             "%d\n", __func__, ret);
1310         }
1311 }
1312
1313 static void ide_port_init_devices(ide_hwif_t *hwif)
1314 {
1315         const struct ide_port_ops *port_ops = hwif->port_ops;
1316         int i;
1317
1318         for (i = 0; i < MAX_DRIVES; i++) {
1319                 ide_drive_t *drive = &hwif->drives[i];
1320
1321                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1322                         drive->io_32bit = 1;
1323                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1324                         drive->unmask = 1;
1325                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1326                         drive->no_unmask = 1;
1327         }
1328
1329         if (port_ops && port_ops->port_init_devs)
1330                 port_ops->port_init_devs(hwif);
1331 }
1332
1333 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1334                           const struct ide_port_info *d)
1335 {
1336         hwif->channel = port;
1337
1338         if (d->chipset)
1339                 hwif->chipset = d->chipset;
1340
1341         if (d->init_iops)
1342                 d->init_iops(hwif);
1343
1344         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1345             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1346                 hwif->irq = port ? 15 : 14;
1347
1348         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1349         hwif->host_flags |= d->host_flags;
1350         hwif->pio_mask = d->pio_mask;
1351
1352         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1353         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1354                 hwif->port_ops = d->port_ops;
1355
1356         hwif->swdma_mask = d->swdma_mask;
1357         hwif->mwdma_mask = d->mwdma_mask;
1358         hwif->ultra_mask = d->udma_mask;
1359
1360         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1361                 int rc;
1362
1363                 if (d->init_dma)
1364                         rc = d->init_dma(hwif, d);
1365                 else
1366                         rc = ide_hwif_setup_dma(hwif, d);
1367
1368                 if (rc < 0) {
1369                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1370                         hwif->swdma_mask = 0;
1371                         hwif->mwdma_mask = 0;
1372                         hwif->ultra_mask = 0;
1373                 } else if (d->dma_ops)
1374                         hwif->dma_ops = d->dma_ops;
1375         }
1376
1377         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1378             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base)) {
1379                 if (hwif->mate)
1380                         hwif->mate->serialized = hwif->serialized = 1;
1381         }
1382
1383         if (d->host_flags & IDE_HFLAG_RQSIZE_256)
1384                 hwif->rqsize = 256;
1385
1386         /* call chipset specific routine for each enabled port */
1387         if (d->init_hwif)
1388                 d->init_hwif(hwif);
1389 }
1390
1391 static void ide_port_cable_detect(ide_hwif_t *hwif)
1392 {
1393         const struct ide_port_ops *port_ops = hwif->port_ops;
1394
1395         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1396                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1397                         hwif->cbl = port_ops->cable_detect(hwif);
1398         }
1399 }
1400
1401 static ssize_t store_delete_devices(struct device *portdev,
1402                                     struct device_attribute *attr,
1403                                     const char *buf, size_t n)
1404 {
1405         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1406
1407         if (strncmp(buf, "1", n))
1408                 return -EINVAL;
1409
1410         ide_port_unregister_devices(hwif);
1411
1412         return n;
1413 };
1414
1415 static DEVICE_ATTR(delete_devices, S_IWUSR, NULL, store_delete_devices);
1416
1417 static ssize_t store_scan(struct device *portdev,
1418                           struct device_attribute *attr,
1419                           const char *buf, size_t n)
1420 {
1421         ide_hwif_t *hwif = dev_get_drvdata(portdev);
1422
1423         if (strncmp(buf, "1", n))
1424                 return -EINVAL;
1425
1426         ide_port_unregister_devices(hwif);
1427         ide_port_scan(hwif);
1428
1429         return n;
1430 };
1431
1432 static DEVICE_ATTR(scan, S_IWUSR, NULL, store_scan);
1433
1434 static struct device_attribute *ide_port_attrs[] = {
1435         &dev_attr_delete_devices,
1436         &dev_attr_scan,
1437         NULL
1438 };
1439
1440 static int ide_sysfs_register_port(ide_hwif_t *hwif)
1441 {
1442         int i, rc;
1443
1444         for (i = 0; ide_port_attrs[i]; i++) {
1445                 rc = device_create_file(hwif->portdev, ide_port_attrs[i]);
1446                 if (rc)
1447                         break;
1448         }
1449
1450         return rc;
1451 }
1452
1453 /**
1454  *      ide_find_port_slot      -       find free ide_hwifs[] slot
1455  *      @d: IDE port info
1456  *
1457  *      Return the new hwif.  If we are out of free slots return NULL.
1458  */
1459
1460 ide_hwif_t *ide_find_port_slot(const struct ide_port_info *d)
1461 {
1462         ide_hwif_t *hwif;
1463         int i;
1464         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1465
1466         /*
1467          * Claim an unassigned slot.
1468          *
1469          * Give preference to claiming other slots before claiming ide0/ide1,
1470          * just in case there's another interface yet-to-be-scanned
1471          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1472          *
1473          * Unless there is a bootable card that does not use the standard
1474          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1475          */
1476         if (bootable) {
1477                 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1478
1479                 for (; i < MAX_HWIFS; i++) {
1480                         hwif = &ide_hwifs[i];
1481                         if (hwif->chipset == ide_unknown)
1482                                 return hwif;
1483                 }
1484         } else {
1485                 for (i = 2; i < MAX_HWIFS; i++) {
1486                         hwif = &ide_hwifs[i];
1487                         if (hwif->chipset == ide_unknown)
1488                                 return hwif;
1489                 }
1490                 for (i = 0; i < 2 && i < MAX_HWIFS; i++) {
1491                         hwif = &ide_hwifs[i];
1492                         if (hwif->chipset == ide_unknown)
1493                                 return hwif;
1494                 }
1495         }
1496
1497         return NULL;
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);