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

   1 /*
   2  *  Copyright (C) 1994-1998   Linus Torvalds & authors (see below)
   3  *  Copyright (C) 2005, 2007  Bartlomiej Zolnierkiewicz
   4  */
   5
   6 /*
   7  *  Mostly written by Mark Lord <mlord@pobox.com>
   8  *                and Gadi Oxman <gadio@netvision.net.il>
   9  *                and Andre Hedrick <andre@linux-ide.org>
  10  *
  11  *  See linux/MAINTAINERS for address of current maintainer.
  12  *
  13  * This is the IDE probe module, as evolved from hd.c and ide.c.
  14  *
  15  * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  16  *       by Andrea Arcangeli
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/types.h>
  21 #include <linux/string.h>
  22 #include <linux/kernel.h>
  23 #include <linux/timer.h>
  24 #include <linux/mm.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/major.h>
  27 #include <linux/errno.h>
  28 #include <linux/genhd.h>
  29 #include <linux/slab.h>
  30 #include <linux/delay.h>
  31 #include <linux/ide.h>
  32 #include <linux/spinlock.h>
  33 #include <linux/kmod.h>
  34 #include <linux/pci.h>
  35 #include <linux/scatterlist.h>
  36
  37 #include <asm/byteorder.h>
  38 #include <asm/irq.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/io.h>
  41
  42 /**
  43  *      generic_id              -       add a generic drive id
  44  *      @drive: drive to make an ID block for
  45  *
  46  *      Add a fake id field to the drive we are passed. This allows
  47  *      use to skip a ton of NULL checks (which people always miss)
  48  *      and make drive properties unconditional outside of this file
  49  */
  50
  51 static void generic_id(ide_drive_t *drive)
  52 {
  53         u16 *id = drive->id;
  54
  55         id[ATA_ID_CUR_CYLS]     = id[ATA_ID_CYLS]       = drive->cyl;
  56         id[ATA_ID_CUR_HEADS]    = id[ATA_ID_HEADS]      = drive->head;
  57         id[ATA_ID_CUR_SECTORS]  = id[ATA_ID_SECTORS]    = drive->sect;
  58 }
  59
  60 static void ide_disk_init_chs(ide_drive_t *drive)
  61 {
  62         u16 *id = drive->id;
  63
  64         /* Extract geometry if we did not already have one for the drive */
  65         if (!drive->cyl || !drive->head || !drive->sect) {
  66                 drive->cyl  = drive->bios_cyl  = id[ATA_ID_CYLS];
  67                 drive->head = drive->bios_head = id[ATA_ID_HEADS];
  68                 drive->sect = drive->bios_sect = id[ATA_ID_SECTORS];
  69         }
  70
  71         /* Handle logical geometry translation by the drive */
  72         if (ata_id_current_chs_valid(id)) {
  73                 drive->cyl  = id[ATA_ID_CUR_CYLS];
  74                 drive->head = id[ATA_ID_CUR_HEADS];
  75                 drive->sect = id[ATA_ID_CUR_SECTORS];
  76         }
  77
  78         /* Use physical geometry if what we have still makes no sense */
  79         if (drive->head > 16 && id[ATA_ID_HEADS] && id[ATA_ID_HEADS] <= 16) {
  80                 drive->cyl  = id[ATA_ID_CYLS];
  81                 drive->head = id[ATA_ID_HEADS];
  82                 drive->sect = id[ATA_ID_SECTORS];
  83         }
  84 }
  85
  86 static void ide_disk_init_mult_count(ide_drive_t *drive)
  87 {
  88         u16 *id = drive->id;
  89         u8 max_multsect = id[ATA_ID_MAX_MULTSECT] & 0xff;
  90
  91         if (max_multsect) {
  92                 if ((max_multsect / 2) > 1)
  93                         id[ATA_ID_MULTSECT] = max_multsect | 0x100;
  94                 else
  95                         id[ATA_ID_MULTSECT] &= ~0x1ff;
  96
  97                 drive->mult_req = id[ATA_ID_MULTSECT] & 0xff;
  98
  99                 if (drive->mult_req)
 100                         drive->special.b.set_multmode = 1;
 101         }
 102 }
 103
 104 static void ide_classify_ata_dev(ide_drive_t *drive)
 105 {
 106         u16 *id = drive->id;
 107         char *m = (char *)&id[ATA_ID_PROD];
 108         int is_cfa = ata_id_is_cfa(id);
 109
 110         /* CF devices are *not* removable in Linux definition of the term */
 111         if (is_cfa == 0 && (id[ATA_ID_CONFIG] & (1 << 7)))
 112                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 113
 114         drive->media = ide_disk;
 115
 116         if (!ata_id_has_unload(drive->id))
 117                 drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
 118
 119         printk(KERN_INFO "%s: %s, %s DISK drive\n", drive->name, m,
 120                 is_cfa ? "CFA" : "ATA");
 121 }
 122
 123 static void ide_classify_atapi_dev(ide_drive_t *drive)
 124 {
 125         u16 *id = drive->id;
 126         char *m = (char *)&id[ATA_ID_PROD];
 127         u8 type = (id[ATA_ID_CONFIG] >> 8) & 0x1f;
 128
 129         printk(KERN_INFO "%s: %s, ATAPI ", drive->name, m);
 130         switch (type) {
 131         case ide_floppy:
 132                 if (!strstr(m, "CD-ROM")) {
 133                         if (!strstr(m, "oppy") &&
 134                             !strstr(m, "poyp") &&
 135                             !strstr(m, "ZIP"))
 136                                 printk(KERN_CONT "cdrom or floppy?, assuming ");
 137                         if (drive->media != ide_cdrom) {
 138                                 printk(KERN_CONT "FLOPPY");
 139                                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 140                                 break;
 141                         }
 142                 }
 143                 /* Early cdrom models used zero */
 144                 type = ide_cdrom;
 145         case ide_cdrom:
 146                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 147 #ifdef CONFIG_PPC
 148                 /* kludge for Apple PowerBook internal zip */
 149                 if (!strstr(m, "CD-ROM") && strstr(m, "ZIP")) {
 150                         printk(KERN_CONT "FLOPPY");
 151                         type = ide_floppy;
 152                         break;
 153                 }
 154 #endif
 155                 printk(KERN_CONT "CD/DVD-ROM");
 156                 break;
 157         case ide_tape:
 158                 printk(KERN_CONT "TAPE");
 159                 break;
 160         case ide_optical:
 161                 printk(KERN_CONT "OPTICAL");
 162                 drive->dev_flags |= IDE_DFLAG_REMOVABLE;
 163                 break;
 164         default:
 165                 printk(KERN_CONT "UNKNOWN (type %d)", type);
 166                 break;
 167         }
 168
 169         printk(KERN_CONT " drive\n");
 170         drive->media = type;
 171         /* an ATAPI device ignores DRDY */
 172         drive->ready_stat = 0;
 173         if (ata_id_cdb_intr(id))
 174                 drive->atapi_flags |= IDE_AFLAG_DRQ_INTERRUPT;
 175         drive->dev_flags |= IDE_DFLAG_DOORLOCKING;
 176         /* we don't do head unloading on ATAPI devices */
 177         drive->dev_flags |= IDE_DFLAG_NO_UNLOAD;
 178 }
 179
 180 /**
 181  *      do_identify     -       identify a drive
 182  *      @drive: drive to identify
 183  *      @cmd: command used
 184  *
 185  *      Called when we have issued a drive identify command to
 186  *      read and parse the results. This function is run with
 187  *      interrupts disabled.
 188  */
 189
 190 static void do_identify(ide_drive_t *drive, u8 cmd)
 191 {
 192         ide_hwif_t *hwif = drive->hwif;
 193         u16 *id = drive->id;
 194         char *m = (char *)&id[ATA_ID_PROD];
 195         unsigned long flags;
 196         int bswap = 1;
 197
 198         /* local CPU only; some systems need this */
 199         local_irq_save(flags);
 200         /* read 512 bytes of id info */
 201         hwif->tp_ops->input_data(drive, NULL, id, SECTOR_SIZE);
 202         local_irq_restore(flags);
 203
 204         drive->dev_flags |= IDE_DFLAG_ID_READ;
 205 #ifdef DEBUG
 206         printk(KERN_INFO "%s: dumping identify data\n", drive->name);
 207         ide_dump_identify((u8 *)id);
 208 #endif
 209         ide_fix_driveid(id);
 210
 211         /*
 212          *  ATA_CMD_ID_ATA returns little-endian info,
 213          *  ATA_CMD_ID_ATAPI *usually* returns little-endian info.
 214          */
 215         if (cmd == ATA_CMD_ID_ATAPI) {
 216                 if ((m[0] == 'N' && m[1] == 'E') ||  /* NEC */
 217                     (m[0] == 'F' && m[1] == 'X') ||  /* Mitsumi */
 218                     (m[0] == 'P' && m[1] == 'i'))    /* Pioneer */
 219                         /* Vertos drives may still be weird */
 220                         bswap ^= 1;
 221         }
 222
 223         ide_fixstring(m, ATA_ID_PROD_LEN, bswap);
 224         ide_fixstring((char *)&id[ATA_ID_FW_REV], ATA_ID_FW_REV_LEN, bswap);
 225         ide_fixstring((char *)&id[ATA_ID_SERNO], ATA_ID_SERNO_LEN, bswap);
 226
 227         /* we depend on this a lot! */
 228         m[ATA_ID_PROD_LEN - 1] = '\0';
 229
 230         if (strstr(m, "E X A B Y T E N E S T"))
 231                 goto err_misc;
 232
 233         drive->dev_flags |= IDE_DFLAG_PRESENT;
 234         drive->dev_flags &= ~IDE_DFLAG_DEAD;
 235
 236         /*
 237          * Check for an ATAPI device
 238          */
 239         if (cmd == ATA_CMD_ID_ATAPI)
 240                 ide_classify_atapi_dev(drive);
 241         else
 242         /*
 243          * Not an ATAPI device: looks like a "regular" hard disk
 244          */
 245                 ide_classify_ata_dev(drive);
 246         return;
 247 err_misc:
 248         kfree(id);
 249         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 250 }
 251
 252 /**
 253  *      actual_try_to_identify  -       send ata/atapi identify
 254  *      @drive: drive to identify
 255  *      @cmd: command to use
 256  *
 257  *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 258  *      and waits for a response.  It also monitors irqs while this is
 259  *      happening, in hope of automatically determining which one is
 260  *      being used by the interface.
 261  *
 262  *      Returns:        0  device was identified
 263  *                      1  device timed-out (no response to identify request)
 264  *                      2  device aborted the command (refused to identify itself)
 265  */
 266
 267 static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 268 {
 269         ide_hwif_t *hwif = drive->hwif;
 270         struct ide_io_ports *io_ports = &hwif->io_ports;
 271         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 272         int use_altstatus = 0, rc;
 273         unsigned long timeout;
 274         u8 s = 0, a = 0;
 275
 276         /* take a deep breath */
 277         msleep(50);
 278
 279         if (io_ports->ctl_addr &&
 280             (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
 281                 a = tp_ops->read_altstatus(hwif);
 282                 s = tp_ops->read_status(hwif);
 283                 if ((a ^ s) & ~ATA_IDX)
 284                         /* ancient Seagate drives, broken interfaces */
 285                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 286                                          "instead of ALTSTATUS(0x%02x)\n",
 287                                          drive->name, s, a);
 288                 else
 289                         /* use non-intrusive polling */
 290                         use_altstatus = 1;
 291         }
 292
 293         /* set features register for atapi
 294          * identify command to be sure of reply
 295          */
 296         if (cmd == ATA_CMD_ID_ATAPI) {
 297                 ide_task_t task;
 298
 299                 memset(&task, 0, sizeof(task));
 300                 /* disable DMA & overlap */
 301                 task.tf_flags = IDE_TFLAG_OUT_FEATURE;
 302
 303                 tp_ops->tf_load(drive, &task);
 304         }
 305
 306         /* ask drive for ID */
 307         tp_ops->exec_command(hwif, cmd);
 308
 309         timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 310
 311         if (ide_busy_sleep(hwif, timeout, use_altstatus))
 312                 return 1;
 313
 314         /* wait for IRQ and ATA_DRQ */
 315         msleep(50);
 316         s = tp_ops->read_status(hwif);
 317
 318         if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
 319                 /* drive returned ID */
 320                 do_identify(drive, cmd);
 321                 /* drive responded with ID */
 322                 rc = 0;
 323                 /* clear drive IRQ */
 324                 (void)tp_ops->read_status(hwif);
 325         } else {
 326                 /* drive refused ID */
 327                 rc = 2;
 328         }
 329         return rc;
 330 }
 331
 332 /**
 333  *      try_to_identify -       try to identify a drive
 334  *      @drive: drive to probe
 335  *      @cmd: command to use
 336  *
 337  *      Issue the identify command and then do IRQ probing to
 338  *      complete the identification when needed by finding the
 339  *      IRQ the drive is attached to
 340  */
 341
 342 static int try_to_identify (ide_drive_t *drive, u8 cmd)
 343 {
 344         ide_hwif_t *hwif = drive->hwif;
 345         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 346         int retval;
 347         int autoprobe = 0;
 348         unsigned long cookie = 0;
 349
 350         /*
 351          * Disable device irq unless we need to
 352          * probe for it. Otherwise we'll get spurious
 353          * interrupts during the identify-phase that
 354          * the irq handler isn't expecting.
 355          */
 356         if (hwif->io_ports.ctl_addr) {
 357                 if (!hwif->irq) {
 358                         autoprobe = 1;
 359                         cookie = probe_irq_on();
 360                 }
 361                 tp_ops->set_irq(hwif, autoprobe);
 362         }
 363
 364         retval = actual_try_to_identify(drive, cmd);
 365
 366         if (autoprobe) {
 367                 int irq;
 368
 369                 tp_ops->set_irq(hwif, 0);
 370                 /* clear drive IRQ */
 371                 (void)tp_ops->read_status(hwif);
 372                 udelay(5);
 373                 irq = probe_irq_off(cookie);
 374                 if (!hwif->irq) {
 375                         if (irq > 0) {
 376                                 hwif->irq = irq;
 377                         } else {
 378                                 /* Mmmm.. multiple IRQs..
 379                                  * don't know which was ours
 380                                  */
 381                                 printk(KERN_ERR "%s: IRQ probe failed (0x%lx)\n",
 382                                         drive->name, cookie);
 383                         }
 384                 }
 385         }
 386         return retval;
 387 }
 388
 389 int ide_busy_sleep(ide_hwif_t *hwif, unsigned long timeout, int altstatus)
 390 {
 391         u8 stat;
 392
 393         timeout += jiffies;
 394
 395         do {
 396                 msleep(50);     /* give drive a breather */
 397                 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
 398                                  : hwif->tp_ops->read_status(hwif);
 399                 if ((stat & ATA_BUSY) == 0)
 400                         return 0;
 401         } while (time_before(jiffies, timeout));
 402
 403         return 1;       /* drive timed-out */
 404 }
 405
 406 static u8 ide_read_device(ide_drive_t *drive)
 407 {
 408         ide_task_t task;
 409
 410         memset(&task, 0, sizeof(task));
 411         task.tf_flags = IDE_TFLAG_IN_DEVICE;
 412
 413         drive->hwif->tp_ops->tf_read(drive, &task);
 414
 415         return task.tf.device;
 416 }
 417
 418 /**
 419  *      do_probe                -       probe an IDE device
 420  *      @drive: drive to probe
 421  *      @cmd: command to use
 422  *
 423  *      do_probe() has the difficult job of finding a drive if it exists,
 424  *      without getting hung up if it doesn't exist, without trampling on
 425  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 426  *
 427  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 428  *      but does not respond right away, the probe will "hang in there"
 429  *      for the maximum wait time (about 30 seconds), otherwise it will
 430  *      exit much more quickly.
 431  *
 432  * Returns:     0  device was identified
 433  *              1  device timed-out (no response to identify request)
 434  *              2  device aborted the command (refused to identify itself)
 435  *              3  bad status from device (possible for ATAPI drives)
 436  *              4  probe was not attempted because failure was obvious
 437  */
 438
 439 static int do_probe (ide_drive_t *drive, u8 cmd)
 440 {
 441         ide_hwif_t *hwif = drive->hwif;
 442         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 443         int rc;
 444         u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
 445
 446         /* avoid waiting for inappropriate probes */
 447         if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
 448                 return 4;
 449
 450 #ifdef DEBUG
 451         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 452                 drive->name, present, drive->media,
 453                 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
 454 #endif
 455
 456         /* needed for some systems
 457          * (e.g. crw9624 as drive0 with disk as slave)
 458          */
 459         msleep(50);
 460         SELECT_DRIVE(drive);
 461         msleep(50);
 462
 463         if (ide_read_device(drive) != drive->select && present == 0) {
 464                 if (drive->dn & 1) {
 465                         /* exit with drive0 selected */
 466                         SELECT_DRIVE(hwif->devices[0]);
 467                         /* allow ATA_BUSY to assert & clear */
 468                         msleep(50);
 469                 }
 470                 /* no i/f present: mmm.. this should be a 4 -ml */
 471                 return 3;
 472         }
 473
 474         stat = tp_ops->read_status(hwif);
 475
 476         if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
 477             present || cmd == ATA_CMD_ID_ATAPI) {
 478                 /* send cmd and wait */
 479                 if ((rc = try_to_identify(drive, cmd))) {
 480                         /* failed: try again */
 481                         rc = try_to_identify(drive,cmd);
 482                 }
 483
 484                 stat = tp_ops->read_status(hwif);
 485
 486                 if (stat == (ATA_BUSY | ATA_DRDY))
 487                         return 4;
 488
 489                 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
 490                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 491                                         "resetting drive\n", drive->name, stat);
 492                         msleep(50);
 493                         SELECT_DRIVE(drive);
 494                         msleep(50);
 495                         tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 496                         (void)ide_busy_sleep(hwif, WAIT_WORSTCASE, 0);
 497                         rc = try_to_identify(drive, cmd);
 498                 }
 499
 500                 /* ensure drive IRQ is clear */
 501                 stat = tp_ops->read_status(hwif);
 502
 503                 if (rc == 1)
 504                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 505                                         drive->name, stat);
 506         } else {
 507                 /* not present or maybe ATAPI */
 508                 rc = 3;
 509         }
 510         if (drive->dn & 1) {
 511                 /* exit with drive0 selected */
 512                 SELECT_DRIVE(hwif->devices[0]);
 513                 msleep(50);
 514                 /* ensure drive irq is clear */
 515                 (void)tp_ops->read_status(hwif);
 516         }
 517         return rc;
 518 }
 519
 520 /*
 521  *
 522  */
 523 static void enable_nest (ide_drive_t *drive)
 524 {
 525         ide_hwif_t *hwif = drive->hwif;
 526         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 527         u8 stat;
 528
 529         printk(KERN_INFO "%s: enabling %s -- ",
 530                 hwif->name, (char *)&drive->id[ATA_ID_PROD]);
 531
 532         SELECT_DRIVE(drive);
 533         msleep(50);
 534         tp_ops->exec_command(hwif, ATA_EXABYTE_ENABLE_NEST);
 535
 536         if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 0)) {
 537                 printk(KERN_CONT "failed (timeout)\n");
 538                 return;
 539         }
 540
 541         msleep(50);
 542
 543         stat = tp_ops->read_status(hwif);
 544
 545         if (!OK_STAT(stat, 0, BAD_STAT))
 546                 printk(KERN_CONT "failed (status = 0x%02x)\n", stat);
 547         else
 548                 printk(KERN_CONT "success\n");
 549 }
 550
 551 /**
 552  *      probe_for_drives        -       upper level drive probe
 553  *      @drive: drive to probe for
 554  *
 555  *      probe_for_drive() tests for existence of a given drive using do_probe()
 556  *      and presents things to the user as needed.
 557  *
 558  *      Returns:        0  no device was found
 559  *                      1  device was found
 560  *                         (note: IDE_DFLAG_PRESENT might still be not set)
 561  */
 562
 563 static u8 probe_for_drive(ide_drive_t *drive)
 564 {
 565         char *m;
 566
 567         /*
 568          *      In order to keep things simple we have an id
 569          *      block for all drives at all times. If the device
 570          *      is pre ATA or refuses ATA/ATAPI identify we
 571          *      will add faked data to this.
 572          *
 573          *      Also note that 0 everywhere means "can't do X"
 574          */
 575
 576         drive->dev_flags &= ~IDE_DFLAG_ID_READ;
 577
 578         drive->id = kzalloc(SECTOR_SIZE, GFP_KERNEL);
 579         if (drive->id == NULL) {
 580                 printk(KERN_ERR "ide: out of memory for id data.\n");
 581                 return 0;
 582         }
 583
 584         m = (char *)&drive->id[ATA_ID_PROD];
 585         strcpy(m, "UNKNOWN");
 586
 587         /* skip probing? */
 588         if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
 589 retry:
 590                 /* if !(success||timed-out) */
 591                 if (do_probe(drive, ATA_CMD_ID_ATA) >= 2)
 592                         /* look for ATAPI device */
 593                         (void)do_probe(drive, ATA_CMD_ID_ATAPI);
 594
 595                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 596                         /* drive not found */
 597                         return 0;
 598
 599                 if (strstr(m, "E X A B Y T E N E S T")) {
 600                         enable_nest(drive);
 601                         goto retry;
 602                 }
 603
 604                 /* identification failed? */
 605                 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 606                         if (drive->media == ide_disk) {
 607                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 608                                         drive->name, drive->cyl,
 609                                         drive->head, drive->sect);
 610                         } else if (drive->media == ide_cdrom) {
 611                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 612                         } else {
 613                                 /* nuke it */
 614                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 615                                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 616                         }
 617                 }
 618                 /* drive was found */
 619         }
 620
 621         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 622                 return 0;
 623
 624         /* The drive wasn't being helpful. Add generic info only */
 625         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 626                 generic_id(drive);
 627                 return 1;
 628         }
 629
 630         if (drive->media == ide_disk) {
 631                 ide_disk_init_chs(drive);
 632                 ide_disk_init_mult_count(drive);
 633         }
 634
 635         return !!(drive->dev_flags & IDE_DFLAG_PRESENT);
 636 }
 637
 638 static void hwif_release_dev(struct device *dev)
 639 {
 640         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 641
 642         complete(&hwif->gendev_rel_comp);
 643 }
 644
 645 static int ide_register_port(ide_hwif_t *hwif)
 646 {
 647         int ret;
 648
 649         /* register with global device tree */
 650         dev_set_name(&hwif->gendev, hwif->name);
 651         hwif->gendev.driver_data = hwif;
 652         if (hwif->gendev.parent == NULL)
 653                 hwif->gendev.parent = hwif->dev;
 654         hwif->gendev.release = hwif_release_dev;
 655
 656         ret = device_register(&hwif->gendev);
 657         if (ret < 0) {
 658                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 659                         __func__, ret);
 660                 goto out;
 661         }
 662
 663         hwif->portdev = device_create(ide_port_class, &hwif->gendev,
 664                                       MKDEV(0, 0), hwif, hwif->name);
 665         if (IS_ERR(hwif->portdev)) {
 666                 ret = PTR_ERR(hwif->portdev);
 667                 device_unregister(&hwif->gendev);
 668         }
 669 out:
 670         return ret;
 671 }
 672
 673 /**
 674  *      ide_port_wait_ready     -       wait for port to become ready
 675  *      @hwif: IDE port
 676  *
 677  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 678  *      platforms.  Typical cases are:
 679  *
 680  *      - The firmware hard reset the disk before booting the kernel,
 681  *        the drive is still doing it's poweron-reset sequence, that
 682  *        can take up to 30 seconds.
 683  *
 684  *      - The firmware does nothing (or no firmware), the device is
 685  *        still in POST state (same as above actually).
 686  *
 687  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 688  *        their reset sequence even when they are non-selected slave
 689  *        devices, thus preventing discovery of the main HD.
 690  *
 691  *      Doing this wait-for-non-busy should not harm any existing
 692  *      configuration and fix some issues like the above.
 693  *
 694  *      BenH.
 695  *
 696  *      Returns 0 on success, error code (< 0) otherwise.
 697  */
 698
 699 static int ide_port_wait_ready(ide_hwif_t *hwif)
 700 {
 701         ide_drive_t *drive;
 702         int i, rc;
 703
 704         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 705
 706         /* Let HW settle down a bit from whatever init state we
 707          * come from */
 708         mdelay(2);
 709
 710         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 711          * I know of at least one disk who takes 31 seconds, I use 35
 712          * here to be safe
 713          */
 714         rc = ide_wait_not_busy(hwif, 35000);
 715         if (rc)
 716                 return rc;
 717
 718         /* Now make sure both master & slave are ready */
 719         ide_port_for_each_dev(i, drive, hwif) {
 720                 /* Ignore disks that we will not probe for later. */
 721                 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
 722                     (drive->dev_flags & IDE_DFLAG_PRESENT)) {
 723                         SELECT_DRIVE(drive);
 724                         hwif->tp_ops->set_irq(hwif, 1);
 725                         mdelay(2);
 726                         rc = ide_wait_not_busy(hwif, 35000);
 727                         if (rc)
 728                                 goto out;
 729                 } else
 730                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 731                                           drive->name);
 732         }
 733 out:
 734         /* Exit function with master reselected (let's be sane) */
 735         if (i)
 736                 SELECT_DRIVE(hwif->devices[0]);
 737
 738         return rc;
 739 }
 740
 741 /**
 742  *      ide_undecoded_slave     -       look for bad CF adapters
 743  *      @dev1: slave device
 744  *
 745  *      Analyse the drives on the interface and attempt to decide if we
 746  *      have the same drive viewed twice. This occurs with crap CF adapters
 747  *      and PCMCIA sometimes.
 748  */
 749
 750 void ide_undecoded_slave(ide_drive_t *dev1)
 751 {
 752         ide_drive_t *dev0 = dev1->hwif->devices[0];
 753
 754         if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
 755                 return;
 756
 757         /* If the models don't match they are not the same product */
 758         if (strcmp((char *)&dev0->id[ATA_ID_PROD],
 759                    (char *)&dev1->id[ATA_ID_PROD]))
 760                 return;
 761
 762         /* Serial numbers do not match */
 763         if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
 764                     (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
 765                 return;
 766
 767         /* No serial number, thankfully very rare for CF */
 768         if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
 769                 return;
 770
 771         /* Appears to be an IDE flash adapter with decode bugs */
 772         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 773
 774         dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
 775 }
 776
 777 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 778
 779 static int ide_probe_port(ide_hwif_t *hwif)
 780 {
 781         ide_drive_t *drive;
 782         unsigned long flags;
 783         unsigned int irqd;
 784         int i, rc = -ENODEV;
 785
 786         BUG_ON(hwif->present);
 787
 788         if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
 789             (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE))
 790                 return -EACCES;
 791
 792         /*
 793          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 794          * we'll install our IRQ driver much later...
 795          */
 796         irqd = hwif->irq;
 797         if (irqd)
 798                 disable_irq(hwif->irq);
 799
 800         local_save_flags(flags);
 801         local_irq_enable_in_hardirq();
 802
 803         if (ide_port_wait_ready(hwif) == -EBUSY)
 804                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 805
 806         /*
 807          * Second drive should only exist if first drive was found,
 808          * but a lot of cdrom drives are configured as single slaves.
 809          */
 810         ide_port_for_each_dev(i, drive, hwif) {
 811                 (void) probe_for_drive(drive);
 812                 if (drive->dev_flags & IDE_DFLAG_PRESENT)
 813                         rc = 0;
 814         }
 815
 816         local_irq_restore(flags);
 817
 818         /*
 819          * Use cached IRQ number. It might be (and is...) changed by probe
 820          * code above
 821          */
 822         if (irqd)
 823                 enable_irq(irqd);
 824
 825         return rc;
 826 }
 827
 828 static void ide_port_tune_devices(ide_hwif_t *hwif)
 829 {
 830         const struct ide_port_ops *port_ops = hwif->port_ops;
 831         ide_drive_t *drive;
 832         int i;
 833
 834         ide_port_for_each_dev(i, drive, hwif) {
 835                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 836                         if (port_ops && port_ops->quirkproc)
 837                                 port_ops->quirkproc(drive);
 838                 }
 839         }
 840
 841         ide_port_for_each_dev(i, drive, hwif) {
 842                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
 843                         ide_set_max_pio(drive);
 844
 845                         drive->dev_flags |= IDE_DFLAG_NICE1;
 846
 847                         if (hwif->dma_ops)
 848                                 ide_set_dma(drive);
 849                 }
 850         }
 851
 852         ide_port_for_each_dev(i, drive, hwif) {
 853                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
 854                         drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
 855                 else
 856                         drive->dev_flags &= ~IDE_DFLAG_NO_IO_32BIT;
 857         }
 858 }
 859
 860 /*
 861  * init request queue
 862  */
 863 static int ide_init_queue(ide_drive_t *drive)
 864 {
 865         struct request_queue *q;
 866         ide_hwif_t *hwif = drive->hwif;
 867         int max_sectors = 256;
 868         int max_sg_entries = PRD_ENTRIES;
 869
 870         /*
 871          *      Our default set up assumes the normal IDE case,
 872          *      that is 64K segmenting, standard PRD setup
 873          *      and LBA28. Some drivers then impose their own
 874          *      limits and LBA48 we could raise it but as yet
 875          *      do not.
 876          */
 877
 878         q = blk_init_queue_node(do_ide_request, NULL, hwif_to_node(hwif));
 879         if (!q)
 880                 return 1;
 881
 882         q->queuedata = drive;
 883         blk_queue_segment_boundary(q, 0xffff);
 884
 885         if (hwif->rqsize < max_sectors)
 886                 max_sectors = hwif->rqsize;
 887         blk_queue_max_sectors(q, max_sectors);
 888
 889 #ifdef CONFIG_PCI
 890         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 891          * creates segments that don't completely match our boundary
 892          * requirements and thus need to be broken up again. Because it
 893          * doesn't align properly either, we may actually have to break up
 894          * to more segments than what was we got in the first place, a max
 895          * worst case is twice as many.
 896          * This will be fixed once we teach pci_map_sg() about our boundary
 897          * requirements, hopefully soon. *FIXME*
 898          */
 899         if (!PCI_DMA_BUS_IS_PHYS)
 900                 max_sg_entries >>= 1;
 901 #endif /* CONFIG_PCI */
 902
 903         blk_queue_max_hw_segments(q, max_sg_entries);
 904         blk_queue_max_phys_segments(q, max_sg_entries);
 905
 906         /* assign drive queue */
 907         drive->queue = q;
 908
 909         /* needs drive->queue to be set */
 910         ide_toggle_bounce(drive, 1);
 911
 912         return 0;
 913 }
 914
 915 static DEFINE_MUTEX(ide_cfg_mtx);
 916
 917 /*
 918  * For any present drive:
 919  * - allocate the block device queue
 920  */
 921 static int ide_port_setup_devices(ide_hwif_t *hwif)
 922 {
 923         ide_drive_t *drive;
 924         int i, j = 0;
 925
 926         mutex_lock(&ide_cfg_mtx);
 927         ide_port_for_each_dev(i, drive, hwif) {
 928                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 929                         continue;
 930
 931                 if (ide_init_queue(drive)) {
 932                         printk(KERN_ERR "ide: failed to init %s\n",
 933                                         drive->name);
 934                         kfree(drive->id);
 935                         drive->id = NULL;
 936                         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 937                         continue;
 938                 }
 939
 940                 j++;
 941         }
 942         mutex_unlock(&ide_cfg_mtx);
 943
 944         return j;
 945 }
 946
 947 /*
 948  * This routine sets up the IRQ for an IDE interface.
 949  */
 950 static int init_irq (ide_hwif_t *hwif)
 951 {
 952         struct ide_io_ports *io_ports = &hwif->io_ports;
 953         int sa = 0;
 954
 955         mutex_lock(&ide_cfg_mtx);
 956         spin_lock_init(&hwif->lock);
 957
 958         init_timer(&hwif->timer);
 959         hwif->timer.function = &ide_timer_expiry;
 960         hwif->timer.data = (unsigned long)hwif;
 961
 962 #if defined(__mc68000__)
 963         sa = IRQF_SHARED;
 964 #endif /* __mc68000__ */
 965
 966         if (hwif->chipset == ide_pci)
 967                 sa = IRQF_SHARED;
 968
 969         if (io_ports->ctl_addr)
 970                 hwif->tp_ops->set_irq(hwif, 1);
 971
 972         if (request_irq(hwif->irq, &ide_intr, sa, hwif->name, hwif))
 973                 goto out_up;
 974
 975         if (!hwif->rqsize) {
 976                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
 977                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
 978                         hwif->rqsize = 256;
 979                 else
 980                         hwif->rqsize = 65536;
 981         }
 982
 983 #if !defined(__mc68000__)
 984         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
 985                 io_ports->data_addr, io_ports->status_addr,
 986                 io_ports->ctl_addr, hwif->irq);
 987 #else
 988         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
 989                 io_ports->data_addr, hwif->irq);
 990 #endif /* __mc68000__ */
 991         if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
 992                 printk(KERN_CONT " (serialized)");
 993         printk(KERN_CONT "\n");
 994
 995         mutex_unlock(&ide_cfg_mtx);
 996         return 0;
 997 out_up:
 998         mutex_unlock(&ide_cfg_mtx);
 999         return 1;
1000 }
1001
1002 static int ata_lock(dev_t dev, void *data)
1003 {
1004         /* FIXME: we want to pin hwif down */
1005         return 0;
1006 }
1007
1008 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1009 {
1010         ide_hwif_t *hwif = data;
1011         int unit = *part >> PARTN_BITS;
1012         ide_drive_t *drive = hwif->devices[unit];
1013
1014         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1015                 return NULL;
1016
1017         if (drive->media == ide_disk)
1018                 request_module("ide-disk");
1019         if (drive->media == ide_cdrom || drive->media == ide_optical)
1020                 request_module("ide-cd");
1021         if (drive->media == ide_tape)
1022                 request_module("ide-tape");
1023         if (drive->media == ide_floppy)
1024                 request_module("ide-floppy");
1025
1026         return NULL;
1027 }
1028
1029 static struct kobject *exact_match(dev_t dev, int *part, void *data)
1030 {
1031         struct gendisk *p = data;
1032         *part &= (1 << PARTN_BITS) - 1;
1033         return &disk_to_dev(p)->kobj;
1034 }
1035
1036 static int exact_lock(dev_t dev, void *data)
1037 {
1038         struct gendisk *p = data;
1039
1040         if (!get_disk(p))
1041                 return -1;
1042         return 0;
1043 }
1044
1045 void ide_register_region(struct gendisk *disk)
1046 {
1047         blk_register_region(MKDEV(disk->major, disk->first_minor),
1048                             disk->minors, NULL, exact_match, exact_lock, disk);
1049 }
1050
1051 EXPORT_SYMBOL_GPL(ide_register_region);
1052
1053 void ide_unregister_region(struct gendisk *disk)
1054 {
1055         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1056                               disk->minors);
1057 }
1058
1059 EXPORT_SYMBOL_GPL(ide_unregister_region);
1060
1061 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1062 {
1063         ide_hwif_t *hwif = drive->hwif;
1064         unsigned int unit = drive->dn & 1;
1065
1066         disk->major = hwif->major;
1067         disk->first_minor = unit << PARTN_BITS;
1068         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1069         disk->queue = drive->queue;
1070 }
1071
1072 EXPORT_SYMBOL_GPL(ide_init_disk);
1073
1074 static void drive_release_dev (struct device *dev)
1075 {
1076         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1077         ide_hwif_t *hwif = drive->hwif;
1078
1079         ide_proc_unregister_device(drive);
1080
1081         spin_lock_irq(&hwif->lock);
1082         kfree(drive->id);
1083         drive->id = NULL;
1084         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
1085         /* Messed up locking ... */
1086         spin_unlock_irq(&hwif->lock);
1087         blk_cleanup_queue(drive->queue);
1088         spin_lock_irq(&hwif->lock);
1089         drive->queue = NULL;
1090         spin_unlock_irq(&hwif->lock);
1091
1092         complete(&drive->gendev_rel_comp);
1093 }
1094
1095 static int hwif_init(ide_hwif_t *hwif)
1096 {
1097         int old_irq;
1098
1099         if (!hwif->irq) {
1100                 hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1101                 if (!hwif->irq) {
1102                         printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
1103                         return 0;
1104                 }
1105         }
1106
1107         if (register_blkdev(hwif->major, hwif->name))
1108                 return 0;
1109
1110         if (!hwif->sg_max_nents)
1111                 hwif->sg_max_nents = PRD_ENTRIES;
1112
1113         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1114                                  GFP_KERNEL);
1115         if (!hwif->sg_table) {
1116                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1117                 goto out;
1118         }
1119
1120         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1121
1122         if (init_irq(hwif) == 0)
1123                 goto done;
1124
1125         old_irq = hwif->irq;
1126         /*
1127          *      It failed to initialise. Find the default IRQ for
1128          *      this port and try that.
1129          */
1130         hwif->irq = __ide_default_irq(hwif->io_ports.data_addr);
1131         if (!hwif->irq) {
1132                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1133                         hwif->name, old_irq);
1134                 goto out;
1135         }
1136         if (init_irq(hwif)) {
1137                 printk(KERN_ERR "%s: probed IRQ %d and default IRQ %d failed\n",
1138                         hwif->name, old_irq, hwif->irq);
1139                 goto out;
1140         }
1141         printk(KERN_WARNING "%s: probed IRQ %d failed, using default\n",
1142                 hwif->name, hwif->irq);
1143
1144 done:
1145         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1146                             THIS_MODULE, ata_probe, ata_lock, hwif);
1147         return 1;
1148
1149 out:
1150         unregister_blkdev(hwif->major, hwif->name);
1151         return 0;
1152 }
1153
1154 static void hwif_register_devices(ide_hwif_t *hwif)
1155 {
1156         ide_drive_t *drive;
1157         unsigned int i;
1158
1159         ide_port_for_each_dev(i, drive, hwif) {
1160                 struct device *dev = &drive->gendev;
1161                 int ret;
1162
1163                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
1164                         continue;
1165
1166                 dev_set_name(dev, "%u.%u", hwif->index, i);
1167                 dev->parent = &hwif->gendev;
1168                 dev->bus = &ide_bus_type;
1169                 dev->driver_data = drive;
1170                 dev->release = drive_release_dev;
1171
1172                 ret = device_register(dev);
1173                 if (ret < 0)
1174                         printk(KERN_WARNING "IDE: %s: device_register error: "
1175                                             "%d\n", __func__, ret);
1176         }
1177 }
1178
1179 static void ide_port_init_devices(ide_hwif_t *hwif)
1180 {
1181         const struct ide_port_ops *port_ops = hwif->port_ops;
1182         ide_drive_t *drive;
1183         int i;
1184
1185         ide_port_for_each_dev(i, drive, hwif) {
1186                 drive->dn = i + hwif->channel * 2;
1187
1188                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1189                         drive->io_32bit = 1;
1190                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1191                         drive->dev_flags |= IDE_DFLAG_UNMASK;
1192                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1193                         drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1194
1195                 if (port_ops && port_ops->init_dev)
1196                         port_ops->init_dev(drive);
1197         }
1198 }
1199
1200 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1201                           const struct ide_port_info *d)
1202 {
1203         hwif->channel = port;
1204
1205         if (d->chipset)
1206                 hwif->chipset = d->chipset;
1207
1208         if (d->init_iops)
1209                 d->init_iops(hwif);
1210
1211         if ((!hwif->irq && (d->host_flags & IDE_HFLAG_LEGACY_IRQS)) ||
1212             (d->host_flags & IDE_HFLAG_FORCE_LEGACY_IRQS))
1213                 hwif->irq = port ? 15 : 14;
1214
1215         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1216         hwif->host_flags |= d->host_flags;
1217         hwif->pio_mask = d->pio_mask;
1218
1219         if (d->tp_ops)
1220                 hwif->tp_ops = d->tp_ops;
1221
1222         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1223         if (hwif->chipset != ide_dtc2278 || hwif->channel == 0)
1224                 hwif->port_ops = d->port_ops;
1225
1226         hwif->swdma_mask = d->swdma_mask;
1227         hwif->mwdma_mask = d->mwdma_mask;
1228         hwif->ultra_mask = d->udma_mask;
1229
1230         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1231                 int rc;
1232
1233                 hwif->dma_ops = d->dma_ops;
1234
1235                 if (d->init_dma)
1236                         rc = d->init_dma(hwif, d);
1237                 else
1238                         rc = ide_hwif_setup_dma(hwif, d);
1239
1240                 if (rc < 0) {
1241                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1242
1243                         hwif->dma_ops = NULL;
1244                         hwif->dma_base = 0;
1245                         hwif->swdma_mask = 0;
1246                         hwif->mwdma_mask = 0;
1247                         hwif->ultra_mask = 0;
1248                 }
1249         }
1250
1251         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1252             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
1253                 hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
1254
1255         if (d->max_sectors)
1256                 hwif->rqsize = d->max_sectors;
1257
1258         /* call chipset specific routine for each enabled port */
1259         if (d->init_hwif)
1260                 d->init_hwif(hwif);
1261 }
1262
1263 static void ide_port_cable_detect(ide_hwif_t *hwif)
1264 {
1265         const struct ide_port_ops *port_ops = hwif->port_ops;
1266
1267         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1268                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1269                         hwif->cbl = port_ops->cable_detect(hwif);
1270         }
1271 }
1272
1273 static const u8 ide_hwif_to_major[] =
1274         { IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
1275           IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
1276
1277 static void ide_port_init_devices_data(ide_hwif_t *hwif)
1278 {
1279         ide_drive_t *drive;
1280         int i;
1281
1282         ide_port_for_each_dev(i, drive, hwif) {
1283                 u8 j = (hwif->index * MAX_DRIVES) + i;
1284
1285                 memset(drive, 0, sizeof(*drive));
1286
1287                 drive->media                    = ide_disk;
1288                 drive->select                   = (i << 4) | ATA_DEVICE_OBS;
1289                 drive->hwif                     = hwif;
1290                 drive->ready_stat               = ATA_DRDY;
1291                 drive->bad_wstat                = BAD_W_STAT;
1292                 drive->special.b.recalibrate    = 1;
1293                 drive->special.b.set_geometry   = 1;
1294                 drive->name[0]                  = 'h';
1295                 drive->name[1]                  = 'd';
1296                 drive->name[2]                  = 'a' + j;
1297                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
1298
1299                 INIT_LIST_HEAD(&drive->list);
1300                 init_completion(&drive->gendev_rel_comp);
1301         }
1302 }
1303
1304 static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
1305 {
1306         /* fill in any non-zero initial values */
1307         hwif->index     = index;
1308         hwif->major     = ide_hwif_to_major[index];
1309
1310         hwif->name[0]   = 'i';
1311         hwif->name[1]   = 'd';
1312         hwif->name[2]   = 'e';
1313         hwif->name[3]   = '0' + index;
1314
1315         init_completion(&hwif->gendev_rel_comp);
1316
1317         hwif->tp_ops = &default_tp_ops;
1318
1319         ide_port_init_devices_data(hwif);
1320 }
1321
1322 static void ide_init_port_hw(ide_hwif_t *hwif, hw_regs_t *hw)
1323 {
1324         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
1325         hwif->irq = hw->irq;
1326         hwif->chipset = hw->chipset;
1327         hwif->dev = hw->dev;
1328         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
1329         hwif->ack_intr = hw->ack_intr;
1330         hwif->config_data = hw->config;
1331 }
1332
1333 static unsigned int ide_indexes;
1334
1335 /**
1336  *      ide_find_port_slot      -       find free port slot
1337  *      @d: IDE port info
1338  *
1339  *      Return the new port slot index or -ENOENT if we are out of free slots.
1340  */
1341
1342 static int ide_find_port_slot(const struct ide_port_info *d)
1343 {
1344         int idx = -ENOENT;
1345         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1346         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;;
1347
1348         /*
1349          * Claim an unassigned slot.
1350          *
1351          * Give preference to claiming other slots before claiming ide0/ide1,
1352          * just in case there's another interface yet-to-be-scanned
1353          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1354          *
1355          * Unless there is a bootable card that does not use the standard
1356          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1357          */
1358         mutex_lock(&ide_cfg_mtx);
1359         if (bootable) {
1360                 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1361                         idx = ffz(ide_indexes | i);
1362         } else {
1363                 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1364                         idx = ffz(ide_indexes | 3);
1365                 else if ((ide_indexes & 3) != 3)
1366                         idx = ffz(ide_indexes);
1367         }
1368         if (idx >= 0)
1369                 ide_indexes |= (1 << idx);
1370         mutex_unlock(&ide_cfg_mtx);
1371
1372         return idx;
1373 }
1374
1375 static void ide_free_port_slot(int idx)
1376 {
1377         mutex_lock(&ide_cfg_mtx);
1378         ide_indexes &= ~(1 << idx);
1379         mutex_unlock(&ide_cfg_mtx);
1380 }
1381
1382 static void ide_port_free_devices(ide_hwif_t *hwif)
1383 {
1384         ide_drive_t *drive;
1385         int i;
1386
1387         ide_port_for_each_dev(i, drive, hwif)
1388                 kfree(drive);
1389 }
1390
1391 static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
1392 {
1393         int i;
1394
1395         for (i = 0; i < MAX_DRIVES; i++) {
1396                 ide_drive_t *drive;
1397
1398                 drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
1399                 if (drive == NULL)
1400                         goto out_nomem;
1401
1402                 hwif->devices[i] = drive;
1403         }
1404         return 0;
1405
1406 out_nomem:
1407         ide_port_free_devices(hwif);
1408         return -ENOMEM;
1409 }
1410
1411 struct ide_host *ide_host_alloc(const struct ide_port_info *d, hw_regs_t **hws)
1412 {
1413         struct ide_host *host;
1414         struct device *dev = hws[0] ? hws[0]->dev : NULL;
1415         int node = dev ? dev_to_node(dev) : -1;
1416         int i;
1417
1418         host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
1419         if (host == NULL)
1420                 return NULL;
1421
1422         for (i = 0; i < MAX_HOST_PORTS; i++) {
1423                 ide_hwif_t *hwif;
1424                 int idx;
1425
1426                 if (hws[i] == NULL)
1427                         continue;
1428
1429                 hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
1430                 if (hwif == NULL)
1431                         continue;
1432
1433                 if (ide_port_alloc_devices(hwif, node) < 0) {
1434                         kfree(hwif);
1435                         continue;
1436                 }
1437
1438                 idx = ide_find_port_slot(d);
1439                 if (idx < 0) {
1440                         printk(KERN_ERR "%s: no free slot for interface\n",
1441                                         d ? d->name : "ide");
1442                         kfree(hwif);
1443                         continue;
1444                 }
1445
1446                 ide_init_port_data(hwif, idx);
1447
1448                 hwif->host = host;
1449
1450                 host->ports[i] = hwif;
1451                 host->n_ports++;
1452         }
1453
1454         if (host->n_ports == 0) {
1455                 kfree(host);
1456                 return NULL;
1457         }
1458
1459         host->dev[0] = dev;
1460
1461         if (d) {
1462                 host->init_chipset = d->init_chipset;
1463                 host->host_flags = d->host_flags;
1464         }
1465
1466         return host;
1467 }
1468 EXPORT_SYMBOL_GPL(ide_host_alloc);
1469
1470 static void ide_port_free(ide_hwif_t *hwif)
1471 {
1472         ide_port_free_devices(hwif);
1473         ide_free_port_slot(hwif->index);
1474         kfree(hwif);
1475 }
1476
1477 static void ide_disable_port(ide_hwif_t *hwif)
1478 {
1479         struct ide_host *host = hwif->host;
1480         int i;
1481
1482         printk(KERN_INFO "%s: disabling port\n", hwif->name);
1483
1484         for (i = 0; i < MAX_HOST_PORTS; i++) {
1485                 if (host->ports[i] == hwif) {
1486                         host->ports[i] = NULL;
1487                         host->n_ports--;
1488                 }
1489         }
1490
1491         ide_port_free(hwif);
1492 }
1493
1494 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1495                       hw_regs_t **hws)
1496 {
1497         ide_hwif_t *hwif, *mate = NULL;
1498         int i, j = 0;
1499
1500         ide_host_for_each_port(i, hwif, host) {
1501                 if (hwif == NULL) {
1502                         mate = NULL;
1503                         continue;
1504                 }
1505
1506                 ide_init_port_hw(hwif, hws[i]);
1507                 ide_port_apply_params(hwif);
1508
1509                 if (d == NULL) {
1510                         mate = NULL;
1511                 } else {
1512                         if ((i & 1) && mate) {
1513                                 hwif->mate = mate;
1514                                 mate->mate = hwif;
1515                         }
1516
1517                         mate = (i & 1) ? NULL : hwif;
1518
1519                         ide_init_port(hwif, i & 1, d);
1520                         ide_port_cable_detect(hwif);
1521                 }
1522
1523                 ide_port_init_devices(hwif);
1524         }
1525
1526         ide_host_for_each_port(i, hwif, host) {
1527                 if (hwif == NULL)
1528                         continue;
1529
1530                 if (ide_probe_port(hwif) == 0)
1531                         hwif->present = 1;
1532
1533                 if (hwif->chipset != ide_4drives || !hwif->mate ||
1534                     !hwif->mate->present) {
1535                         if (ide_register_port(hwif)) {
1536                                 ide_disable_port(hwif);
1537                                 continue;
1538                         }
1539                 }
1540
1541                 if (hwif->present)
1542                         ide_port_tune_devices(hwif);
1543         }
1544
1545         ide_host_for_each_port(i, hwif, host) {
1546                 if (hwif == NULL)
1547                         continue;
1548
1549                 if (hwif_init(hwif) == 0) {
1550                         printk(KERN_INFO "%s: failed to initialize IDE "
1551                                          "interface\n", hwif->name);
1552                         device_unregister(&hwif->gendev);
1553                         ide_disable_port(hwif);
1554                         continue;
1555                 }
1556
1557                 if (hwif->present)
1558                         if (ide_port_setup_devices(hwif) == 0) {
1559                                 hwif->present = 0;
1560                                 continue;
1561                         }
1562
1563                 j++;
1564
1565                 ide_acpi_init(hwif);
1566
1567                 if (hwif->present)
1568                         ide_acpi_port_init_devices(hwif);
1569         }
1570
1571         ide_host_for_each_port(i, hwif, host) {
1572                 if (hwif == NULL)
1573                         continue;
1574
1575                 if (hwif->present)
1576                         hwif_register_devices(hwif);
1577         }
1578
1579         ide_host_for_each_port(i, hwif, host) {
1580                 if (hwif == NULL)
1581                         continue;
1582
1583                 ide_sysfs_register_port(hwif);
1584                 ide_proc_register_port(hwif);
1585
1586                 if (hwif->present)
1587                         ide_proc_port_register_devices(hwif);
1588         }
1589
1590         return j ? 0 : -1;
1591 }
1592 EXPORT_SYMBOL_GPL(ide_host_register);
1593
1594 int ide_host_add(const struct ide_port_info *d, hw_regs_t **hws,
1595                  struct ide_host **hostp)
1596 {
1597         struct ide_host *host;
1598         int rc;
1599
1600         host = ide_host_alloc(d, hws);
1601         if (host == NULL)
1602                 return -ENOMEM;
1603
1604         rc = ide_host_register(host, d, hws);
1605         if (rc) {
1606                 ide_host_free(host);
1607                 return rc;
1608         }
1609
1610         if (hostp)
1611                 *hostp = host;
1612
1613         return 0;
1614 }
1615 EXPORT_SYMBOL_GPL(ide_host_add);
1616
1617 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
1618 {
1619         ide_drive_t *drive;
1620         int i;
1621
1622         ide_port_for_each_dev(i, drive, hwif) {
1623                 if (drive->dev_flags & IDE_DFLAG_PRESENT) {
1624                         device_unregister(&drive->gendev);
1625                         wait_for_completion(&drive->gendev_rel_comp);
1626                 }
1627         }
1628 }
1629
1630 void ide_port_unregister_devices(ide_hwif_t *hwif)
1631 {
1632         mutex_lock(&ide_cfg_mtx);
1633         __ide_port_unregister_devices(hwif);
1634         hwif->present = 0;
1635         ide_port_init_devices_data(hwif);
1636         mutex_unlock(&ide_cfg_mtx);
1637 }
1638 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
1639
1640 /**
1641  *      ide_unregister          -       free an IDE interface
1642  *      @hwif: IDE interface
1643  *
1644  *      Perform the final unregister of an IDE interface.
1645  *
1646  *      Locking:
1647  *      The caller must not hold the IDE locks.
1648  *
1649  *      It is up to the caller to be sure there is no pending I/O here,
1650  *      and that the interface will not be reopened (present/vanishing
1651  *      locking isn't yet done BTW).
1652  */
1653
1654 static void ide_unregister(ide_hwif_t *hwif)
1655 {
1656         BUG_ON(in_interrupt());
1657         BUG_ON(irqs_disabled());
1658
1659         mutex_lock(&ide_cfg_mtx);
1660
1661         if (hwif->present) {
1662                 __ide_port_unregister_devices(hwif);
1663                 hwif->present = 0;
1664         }
1665
1666         ide_proc_unregister_port(hwif);
1667
1668         free_irq(hwif->irq, hwif);
1669
1670         device_unregister(hwif->portdev);
1671         device_unregister(&hwif->gendev);
1672         wait_for_completion(&hwif->gendev_rel_comp);
1673
1674         /*
1675          * Remove us from the kernel's knowledge
1676          */
1677         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
1678         kfree(hwif->sg_table);
1679         unregister_blkdev(hwif->major, hwif->name);
1680
1681         ide_release_dma_engine(hwif);
1682
1683         mutex_unlock(&ide_cfg_mtx);
1684 }
1685
1686 void ide_host_free(struct ide_host *host)
1687 {
1688         ide_hwif_t *hwif;
1689         int i;
1690
1691         ide_host_for_each_port(i, hwif, host) {
1692                 if (hwif)
1693                         ide_port_free(hwif);
1694         }
1695
1696         kfree(host);
1697 }
1698 EXPORT_SYMBOL_GPL(ide_host_free);
1699
1700 void ide_host_remove(struct ide_host *host)
1701 {
1702         ide_hwif_t *hwif;
1703         int i;
1704
1705         ide_host_for_each_port(i, hwif, host) {
1706                 if (hwif)
1707                         ide_unregister(hwif);
1708         }
1709
1710         ide_host_free(host);
1711 }
1712 EXPORT_SYMBOL_GPL(ide_host_remove);
1713
1714 void ide_port_scan(ide_hwif_t *hwif)
1715 {
1716         ide_port_apply_params(hwif);
1717         ide_port_cable_detect(hwif);
1718         ide_port_init_devices(hwif);
1719
1720         if (ide_probe_port(hwif) < 0)
1721                 return;
1722
1723         hwif->present = 1;
1724
1725         ide_port_tune_devices(hwif);
1726         ide_port_setup_devices(hwif);
1727         ide_acpi_port_init_devices(hwif);
1728         hwif_register_devices(hwif);
1729         ide_proc_port_register_devices(hwif);
1730 }
1731 EXPORT_SYMBOL_GPL(ide_port_scan);