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 <linux/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_flags |= IDE_SFLAG_SET_MULTMODE;
 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  *      @id: buffer for IDENTIFY data
 185  *
 186  *      Called when we have issued a drive identify command to
 187  *      read and parse the results. This function is run with
 188  *      interrupts disabled.
 189  */
 190
 191 static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id)
 192 {
 193         ide_hwif_t *hwif = drive->hwif;
 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                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 232         else
 233                 drive->dev_flags |= IDE_DFLAG_PRESENT;
 234 }
 235
 236 /**
 237  *      ide_dev_read_id -       send ATA/ATAPI IDENTIFY command
 238  *      @drive: drive to identify
 239  *      @cmd: command to use
 240  *      @id: buffer for IDENTIFY data
 241  *      @irq_ctx: flag set when called from the IRQ context
 242  *
 243  *      Sends an ATA(PI) IDENTIFY request to a drive and waits for a response.
 244  *
 245  *      Returns:        0  device was identified
 246  *                      1  device timed-out (no response to identify request)
 247  *                      2  device aborted the command (refused to identify itself)
 248  */
 249
 250 int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id, int irq_ctx)
 251 {
 252         ide_hwif_t *hwif = drive->hwif;
 253         struct ide_io_ports *io_ports = &hwif->io_ports;
 254         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 255         int use_altstatus = 0, rc;
 256         unsigned long timeout;
 257         u8 s = 0, a = 0;
 258
 259         /*
 260          * Disable device IRQ.  Otherwise we'll get spurious interrupts
 261          * during the identify phase that the IRQ handler isn't expecting.
 262          */
 263         if (io_ports->ctl_addr)
 264                 tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
 265
 266         /* take a deep breath */
 267         if (irq_ctx)
 268                 mdelay(50);
 269         else
 270                 msleep(50);
 271
 272         if (io_ports->ctl_addr &&
 273             (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
 274                 a = tp_ops->read_altstatus(hwif);
 275                 s = tp_ops->read_status(hwif);
 276                 if ((a ^ s) & ~ATA_SENSE)
 277                         /* ancient Seagate drives, broken interfaces */
 278                         printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
 279                                          "instead of ALTSTATUS(0x%02x)\n",
 280                                          drive->name, s, a);
 281                 else
 282                         /* use non-intrusive polling */
 283                         use_altstatus = 1;
 284         }
 285
 286         /* set features register for atapi
 287          * identify command to be sure of reply
 288          */
 289         if (cmd == ATA_CMD_ID_ATAPI) {
 290                 struct ide_taskfile tf;
 291
 292                 memset(&tf, 0, sizeof(tf));
 293                 /* disable DMA & overlap */
 294                 tp_ops->tf_load(drive, &tf, IDE_VALID_FEATURE);
 295         }
 296
 297         /* ask drive for ID */
 298         tp_ops->exec_command(hwif, cmd);
 299
 300         timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 301
 302         /* wait for IRQ and ATA_DRQ */
 303         if (irq_ctx) {
 304                 rc = __ide_wait_stat(drive, ATA_DRQ, BAD_R_STAT, timeout, &s);
 305                 if (rc)
 306                         return 1;
 307         } else {
 308                 rc = ide_busy_sleep(drive, timeout, use_altstatus);
 309                 if (rc)
 310                         return 1;
 311
 312                 msleep(50);
 313                 s = tp_ops->read_status(hwif);
 314         }
 315
 316         if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
 317                 /* drive returned ID */
 318                 do_identify(drive, cmd, id);
 319                 /* drive responded with ID */
 320                 rc = 0;
 321                 /* clear drive IRQ */
 322                 (void)tp_ops->read_status(hwif);
 323         } else {
 324                 /* drive refused ID */
 325                 rc = 2;
 326         }
 327         return rc;
 328 }
 329
 330 int ide_busy_sleep(ide_drive_t *drive, unsigned long timeout, int altstatus)
 331 {
 332         ide_hwif_t *hwif = drive->hwif;
 333         u8 stat;
 334
 335         timeout += jiffies;
 336
 337         do {
 338                 msleep(50);     /* give drive a breather */
 339                 stat = altstatus ? hwif->tp_ops->read_altstatus(hwif)
 340                                  : hwif->tp_ops->read_status(hwif);
 341                 if ((stat & ATA_BUSY) == 0)
 342                         return 0;
 343         } while (time_before(jiffies, timeout));
 344
 345         printk(KERN_ERR "%s: timeout in %s\n", drive->name, __func__);
 346
 347         return 1;       /* drive timed-out */
 348 }
 349
 350 static u8 ide_read_device(ide_drive_t *drive)
 351 {
 352         struct ide_taskfile tf;
 353
 354         drive->hwif->tp_ops->tf_read(drive, &tf, IDE_VALID_DEVICE);
 355
 356         return tf.device;
 357 }
 358
 359 /**
 360  *      do_probe                -       probe an IDE device
 361  *      @drive: drive to probe
 362  *      @cmd: command to use
 363  *
 364  *      do_probe() has the difficult job of finding a drive if it exists,
 365  *      without getting hung up if it doesn't exist, without trampling on
 366  *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 367  *
 368  *      If a drive is "known" to exist (from CMOS or kernel parameters),
 369  *      but does not respond right away, the probe will "hang in there"
 370  *      for the maximum wait time (about 30 seconds), otherwise it will
 371  *      exit much more quickly.
 372  *
 373  * Returns:     0  device was identified
 374  *              1  device timed-out (no response to identify request)
 375  *              2  device aborted the command (refused to identify itself)
 376  *              3  bad status from device (possible for ATAPI drives)
 377  *              4  probe was not attempted because failure was obvious
 378  */
 379
 380 static int do_probe (ide_drive_t *drive, u8 cmd)
 381 {
 382         ide_hwif_t *hwif = drive->hwif;
 383         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 384         u16 *id = drive->id;
 385         int rc;
 386         u8 present = !!(drive->dev_flags & IDE_DFLAG_PRESENT), stat;
 387
 388         /* avoid waiting for inappropriate probes */
 389         if (present && drive->media != ide_disk && cmd == ATA_CMD_ID_ATA)
 390                 return 4;
 391
 392 #ifdef DEBUG
 393         printk(KERN_INFO "probing for %s: present=%d, media=%d, probetype=%s\n",
 394                 drive->name, present, drive->media,
 395                 (cmd == ATA_CMD_ID_ATA) ? "ATA" : "ATAPI");
 396 #endif
 397
 398         /* needed for some systems
 399          * (e.g. crw9624 as drive0 with disk as slave)
 400          */
 401         msleep(50);
 402         tp_ops->dev_select(drive);
 403         msleep(50);
 404
 405         if (ide_read_device(drive) != drive->select && present == 0) {
 406                 if (drive->dn & 1) {
 407                         /* exit with drive0 selected */
 408                         tp_ops->dev_select(hwif->devices[0]);
 409                         /* allow ATA_BUSY to assert & clear */
 410                         msleep(50);
 411                 }
 412                 /* no i/f present: mmm.. this should be a 4 -ml */
 413                 return 3;
 414         }
 415
 416         stat = tp_ops->read_status(hwif);
 417
 418         if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
 419             present || cmd == ATA_CMD_ID_ATAPI) {
 420                 rc = ide_dev_read_id(drive, cmd, id, 0);
 421                 if (rc)
 422                         /* failed: try again */
 423                         rc = ide_dev_read_id(drive, cmd, id, 0);
 424
 425                 stat = tp_ops->read_status(hwif);
 426
 427                 if (stat == (ATA_BUSY | ATA_DRDY))
 428                         return 4;
 429
 430                 if (rc == 1 && cmd == ATA_CMD_ID_ATAPI) {
 431                         printk(KERN_ERR "%s: no response (status = 0x%02x), "
 432                                         "resetting drive\n", drive->name, stat);
 433                         msleep(50);
 434                         tp_ops->dev_select(drive);
 435                         msleep(50);
 436                         tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 437                         (void)ide_busy_sleep(drive, WAIT_WORSTCASE, 0);
 438                         rc = ide_dev_read_id(drive, cmd, id, 0);
 439                 }
 440
 441                 /* ensure drive IRQ is clear */
 442                 stat = tp_ops->read_status(hwif);
 443
 444                 if (rc == 1)
 445                         printk(KERN_ERR "%s: no response (status = 0x%02x)\n",
 446                                         drive->name, stat);
 447         } else {
 448                 /* not present or maybe ATAPI */
 449                 rc = 3;
 450         }
 451         if (drive->dn & 1) {
 452                 /* exit with drive0 selected */
 453                 tp_ops->dev_select(hwif->devices[0]);
 454                 msleep(50);
 455                 /* ensure drive irq is clear */
 456                 (void)tp_ops->read_status(hwif);
 457         }
 458         return rc;
 459 }
 460
 461 /**
 462  *      probe_for_drives        -       upper level drive probe
 463  *      @drive: drive to probe for
 464  *
 465  *      probe_for_drive() tests for existence of a given drive using do_probe()
 466  *      and presents things to the user as needed.
 467  *
 468  *      Returns:        0  no device was found
 469  *                      1  device was found
 470  *                         (note: IDE_DFLAG_PRESENT might still be not set)
 471  */
 472
 473 static u8 probe_for_drive(ide_drive_t *drive)
 474 {
 475         char *m;
 476         int rc;
 477         u8 cmd;
 478
 479         drive->dev_flags &= ~IDE_DFLAG_ID_READ;
 480
 481         m = (char *)&drive->id[ATA_ID_PROD];
 482         strcpy(m, "UNKNOWN");
 483
 484         /* skip probing? */
 485         if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0) {
 486                 /* if !(success||timed-out) */
 487                 cmd = ATA_CMD_ID_ATA;
 488                 rc = do_probe(drive, cmd);
 489                 if (rc >= 2) {
 490                         /* look for ATAPI device */
 491                         cmd = ATA_CMD_ID_ATAPI;
 492                         rc = do_probe(drive, cmd);
 493                 }
 494
 495                 if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 496                         return 0;
 497
 498                 /* identification failed? */
 499                 if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 500                         if (drive->media == ide_disk) {
 501                                 printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 502                                         drive->name, drive->cyl,
 503                                         drive->head, drive->sect);
 504                         } else if (drive->media == ide_cdrom) {
 505                                 printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 506                         } else {
 507                                 /* nuke it */
 508                                 printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 509                                 drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 510                         }
 511                 } else {
 512                         if (cmd == ATA_CMD_ID_ATAPI)
 513                                 ide_classify_atapi_dev(drive);
 514                         else
 515                                 ide_classify_ata_dev(drive);
 516                 }
 517         }
 518
 519         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 520                 return 0;
 521
 522         /* The drive wasn't being helpful. Add generic info only */
 523         if ((drive->dev_flags & IDE_DFLAG_ID_READ) == 0) {
 524                 generic_id(drive);
 525                 return 1;
 526         }
 527
 528         if (drive->media == ide_disk) {
 529                 ide_disk_init_chs(drive);
 530                 ide_disk_init_mult_count(drive);
 531         }
 532
 533         return 1;
 534 }
 535
 536 static void hwif_release_dev(struct device *dev)
 537 {
 538         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 539
 540         complete(&hwif->gendev_rel_comp);
 541 }
 542
 543 static int ide_register_port(ide_hwif_t *hwif)
 544 {
 545         int ret;
 546
 547         /* register with global device tree */
 548         dev_set_name(&hwif->gendev, "%s", hwif->name);
 549         dev_set_drvdata(&hwif->gendev, hwif);
 550         if (hwif->gendev.parent == NULL)
 551                 hwif->gendev.parent = hwif->dev;
 552         hwif->gendev.release = hwif_release_dev;
 553
 554         ret = device_register(&hwif->gendev);
 555         if (ret < 0) {
 556                 printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 557                         __func__, ret);
 558                 goto out;
 559         }
 560
 561         hwif->portdev = device_create(ide_port_class, &hwif->gendev,
 562                                       MKDEV(0, 0), hwif, "%s", hwif->name);
 563         if (IS_ERR(hwif->portdev)) {
 564                 ret = PTR_ERR(hwif->portdev);
 565                 device_unregister(&hwif->gendev);
 566         }
 567 out:
 568         return ret;
 569 }
 570
 571 /**
 572  *      ide_port_wait_ready     -       wait for port to become ready
 573  *      @hwif: IDE port
 574  *
 575  *      This is needed on some PPCs and a bunch of BIOS-less embedded
 576  *      platforms.  Typical cases are:
 577  *
 578  *      - The firmware hard reset the disk before booting the kernel,
 579  *        the drive is still doing it's poweron-reset sequence, that
 580  *        can take up to 30 seconds.
 581  *
 582  *      - The firmware does nothing (or no firmware), the device is
 583  *        still in POST state (same as above actually).
 584  *
 585  *      - Some CD/DVD/Writer combo drives tend to drive the bus during
 586  *        their reset sequence even when they are non-selected slave
 587  *        devices, thus preventing discovery of the main HD.
 588  *
 589  *      Doing this wait-for-non-busy should not harm any existing
 590  *      configuration and fix some issues like the above.
 591  *
 592  *      BenH.
 593  *
 594  *      Returns 0 on success, error code (< 0) otherwise.
 595  */
 596
 597 static int ide_port_wait_ready(ide_hwif_t *hwif)
 598 {
 599         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 600         ide_drive_t *drive;
 601         int i, rc;
 602
 603         printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 604
 605         /* Let HW settle down a bit from whatever init state we
 606          * come from */
 607         mdelay(2);
 608
 609         /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 610          * I know of at least one disk who takes 31 seconds, I use 35
 611          * here to be safe
 612          */
 613         rc = ide_wait_not_busy(hwif, 35000);
 614         if (rc)
 615                 return rc;
 616
 617         /* Now make sure both master & slave are ready */
 618         ide_port_for_each_dev(i, drive, hwif) {
 619                 /* Ignore disks that we will not probe for later. */
 620                 if ((drive->dev_flags & IDE_DFLAG_NOPROBE) == 0 ||
 621                     (drive->dev_flags & IDE_DFLAG_PRESENT)) {
 622                         tp_ops->dev_select(drive);
 623                         tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 624                         mdelay(2);
 625                         rc = ide_wait_not_busy(hwif, 35000);
 626                         if (rc)
 627                                 goto out;
 628                 } else
 629                         printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 630                                           drive->name);
 631         }
 632 out:
 633         /* Exit function with master reselected (let's be sane) */
 634         if (i)
 635                 tp_ops->dev_select(hwif->devices[0]);
 636
 637         return rc;
 638 }
 639
 640 /**
 641  *      ide_undecoded_slave     -       look for bad CF adapters
 642  *      @dev1: slave device
 643  *
 644  *      Analyse the drives on the interface and attempt to decide if we
 645  *      have the same drive viewed twice. This occurs with crap CF adapters
 646  *      and PCMCIA sometimes.
 647  */
 648
 649 void ide_undecoded_slave(ide_drive_t *dev1)
 650 {
 651         ide_drive_t *dev0 = dev1->hwif->devices[0];
 652
 653         if ((dev1->dn & 1) == 0 || (dev0->dev_flags & IDE_DFLAG_PRESENT) == 0)
 654                 return;
 655
 656         /* If the models don't match they are not the same product */
 657         if (strcmp((char *)&dev0->id[ATA_ID_PROD],
 658                    (char *)&dev1->id[ATA_ID_PROD]))
 659                 return;
 660
 661         /* Serial numbers do not match */
 662         if (strncmp((char *)&dev0->id[ATA_ID_SERNO],
 663                     (char *)&dev1->id[ATA_ID_SERNO], ATA_ID_SERNO_LEN))
 664                 return;
 665
 666         /* No serial number, thankfully very rare for CF */
 667         if (*(char *)&dev0->id[ATA_ID_SERNO] == 0)
 668                 return;
 669
 670         /* Appears to be an IDE flash adapter with decode bugs */
 671         printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 672
 673         dev1->dev_flags &= ~IDE_DFLAG_PRESENT;
 674 }
 675
 676 EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 677
 678 static int ide_probe_port(ide_hwif_t *hwif)
 679 {
 680         ide_drive_t *drive;
 681         unsigned int irqd;
 682         int i, rc = -ENODEV;
 683
 684         BUG_ON(hwif->present);
 685
 686         if ((hwif->devices[0]->dev_flags & IDE_DFLAG_NOPROBE) &&
 687             (hwif->devices[1]->dev_flags & IDE_DFLAG_NOPROBE))
 688                 return -EACCES;
 689
 690         /*
 691          * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 692          * we'll install our IRQ driver much later...
 693          */
 694         irqd = hwif->irq;
 695         if (irqd)
 696                 disable_irq(hwif->irq);
 697
 698         if (ide_port_wait_ready(hwif) == -EBUSY)
 699                 printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 700
 701         /*
 702          * Second drive should only exist if first drive was found,
 703          * but a lot of cdrom drives are configured as single slaves.
 704          */
 705         ide_port_for_each_dev(i, drive, hwif) {
 706                 (void) probe_for_drive(drive);
 707                 if (drive->dev_flags & IDE_DFLAG_PRESENT)
 708                         rc = 0;
 709         }
 710
 711         /*
 712          * Use cached IRQ number. It might be (and is...) changed by probe
 713          * code above
 714          */
 715         if (irqd)
 716                 enable_irq(irqd);
 717
 718         return rc;
 719 }
 720
 721 static void ide_port_tune_devices(ide_hwif_t *hwif)
 722 {
 723         const struct ide_port_ops *port_ops = hwif->port_ops;
 724         ide_drive_t *drive;
 725         int i;
 726
 727         ide_port_for_each_present_dev(i, drive, hwif) {
 728                 ide_check_nien_quirk_list(drive);
 729
 730                 if (port_ops && port_ops->quirkproc)
 731                         port_ops->quirkproc(drive);
 732         }
 733
 734         ide_port_for_each_present_dev(i, drive, hwif) {
 735                 ide_set_max_pio(drive);
 736
 737                 drive->dev_flags |= IDE_DFLAG_NICE1;
 738
 739                 if (hwif->dma_ops)
 740                         ide_set_dma(drive);
 741         }
 742 }
 743
 744 static void ide_initialize_rq(struct request *rq)
 745 {
 746         struct ide_request *req = blk_mq_rq_to_pdu(rq);
 747
 748         scsi_req_init(&req->sreq);
 749         req->sreq.sense = req->sense;
 750 }
 751
 752 /*
 753  * init request queue
 754  */
 755 static int ide_init_queue(ide_drive_t *drive)
 756 {
 757         struct request_queue *q;
 758         ide_hwif_t *hwif = drive->hwif;
 759         int max_sectors = 256;
 760         int max_sg_entries = PRD_ENTRIES;
 761
 762         /*
 763          *      Our default set up assumes the normal IDE case,
 764          *      that is 64K segmenting, standard PRD setup
 765          *      and LBA28. Some drivers then impose their own
 766          *      limits and LBA48 we could raise it but as yet
 767          *      do not.
 768          */
 769         q = blk_alloc_queue_node(GFP_KERNEL, hwif_to_node(hwif));
 770         if (!q)
 771                 return 1;
 772
 773         q->request_fn = do_ide_request;
 774         q->initialize_rq_fn = ide_initialize_rq;
 775         q->cmd_size = sizeof(struct ide_request);
 776         queue_flag_set_unlocked(QUEUE_FLAG_SCSI_PASSTHROUGH, q);
 777         if (blk_init_allocated_queue(q) < 0) {
 778                 blk_cleanup_queue(q);
 779                 return 1;
 780         }
 781
 782         q->queuedata = drive;
 783         blk_queue_segment_boundary(q, 0xffff);
 784
 785         if (hwif->rqsize < max_sectors)
 786                 max_sectors = hwif->rqsize;
 787         blk_queue_max_hw_sectors(q, max_sectors);
 788
 789 #ifdef CONFIG_PCI
 790         /* When we have an IOMMU, we may have a problem where pci_map_sg()
 791          * creates segments that don't completely match our boundary
 792          * requirements and thus need to be broken up again. Because it
 793          * doesn't align properly either, we may actually have to break up
 794          * to more segments than what was we got in the first place, a max
 795          * worst case is twice as many.
 796          * This will be fixed once we teach pci_map_sg() about our boundary
 797          * requirements, hopefully soon. *FIXME*
 798          */
 799         if (!PCI_DMA_BUS_IS_PHYS)
 800                 max_sg_entries >>= 1;
 801 #endif /* CONFIG_PCI */
 802
 803         blk_queue_max_segments(q, max_sg_entries);
 804
 805         /* assign drive queue */
 806         drive->queue = q;
 807
 808         /* needs drive->queue to be set */
 809         ide_toggle_bounce(drive, 1);
 810
 811         return 0;
 812 }
 813
 814 static DEFINE_MUTEX(ide_cfg_mtx);
 815
 816 /*
 817  * For any present drive:
 818  * - allocate the block device queue
 819  */
 820 static int ide_port_setup_devices(ide_hwif_t *hwif)
 821 {
 822         ide_drive_t *drive;
 823         int i, j = 0;
 824
 825         mutex_lock(&ide_cfg_mtx);
 826         ide_port_for_each_present_dev(i, drive, hwif) {
 827                 if (ide_init_queue(drive)) {
 828                         printk(KERN_ERR "ide: failed to init %s\n",
 829                                         drive->name);
 830                         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 831                         continue;
 832                 }
 833
 834                 j++;
 835         }
 836         mutex_unlock(&ide_cfg_mtx);
 837
 838         return j;
 839 }
 840
 841 static void ide_host_enable_irqs(struct ide_host *host)
 842 {
 843         ide_hwif_t *hwif;
 844         int i;
 845
 846         ide_host_for_each_port(i, hwif, host) {
 847                 if (hwif == NULL)
 848                         continue;
 849
 850                 /* clear any pending IRQs */
 851                 hwif->tp_ops->read_status(hwif);
 852
 853                 /* unmask IRQs */
 854                 if (hwif->io_ports.ctl_addr)
 855                         hwif->tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 856         }
 857 }
 858
 859 /*
 860  * This routine sets up the IRQ for an IDE interface.
 861  */
 862 static int init_irq (ide_hwif_t *hwif)
 863 {
 864         struct ide_io_ports *io_ports = &hwif->io_ports;
 865         struct ide_host *host = hwif->host;
 866         irq_handler_t irq_handler = host->irq_handler;
 867         int sa = host->irq_flags;
 868
 869         if (irq_handler == NULL)
 870                 irq_handler = ide_intr;
 871
 872         if (!host->get_lock)
 873                 if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
 874                         goto out_up;
 875
 876 #if !defined(__mc68000__)
 877         printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
 878                 io_ports->data_addr, io_ports->status_addr,
 879                 io_ports->ctl_addr, hwif->irq);
 880 #else
 881         printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
 882                 io_ports->data_addr, hwif->irq);
 883 #endif /* __mc68000__ */
 884         if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
 885                 printk(KERN_CONT " (serialized)");
 886         printk(KERN_CONT "\n");
 887
 888         return 0;
 889 out_up:
 890         return 1;
 891 }
 892
 893 static int ata_lock(dev_t dev, void *data)
 894 {
 895         /* FIXME: we want to pin hwif down */
 896         return 0;
 897 }
 898
 899 static struct kobject *ata_probe(dev_t dev, int *part, void *data)
 900 {
 901         ide_hwif_t *hwif = data;
 902         int unit = *part >> PARTN_BITS;
 903         ide_drive_t *drive = hwif->devices[unit];
 904
 905         if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 906                 return NULL;
 907
 908         if (drive->media == ide_disk)
 909                 request_module("ide-disk");
 910         if (drive->media == ide_cdrom || drive->media == ide_optical)
 911                 request_module("ide-cd");
 912         if (drive->media == ide_tape)
 913                 request_module("ide-tape");
 914         if (drive->media == ide_floppy)
 915                 request_module("ide-floppy");
 916
 917         return NULL;
 918 }
 919
 920 static struct kobject *exact_match(dev_t dev, int *part, void *data)
 921 {
 922         struct gendisk *p = data;
 923         *part &= (1 << PARTN_BITS) - 1;
 924         return &disk_to_dev(p)->kobj;
 925 }
 926
 927 static int exact_lock(dev_t dev, void *data)
 928 {
 929         struct gendisk *p = data;
 930
 931         if (!get_disk(p))
 932                 return -1;
 933         return 0;
 934 }
 935
 936 void ide_register_region(struct gendisk *disk)
 937 {
 938         blk_register_region(MKDEV(disk->major, disk->first_minor),
 939                             disk->minors, NULL, exact_match, exact_lock, disk);
 940 }
 941
 942 EXPORT_SYMBOL_GPL(ide_register_region);
 943
 944 void ide_unregister_region(struct gendisk *disk)
 945 {
 946         blk_unregister_region(MKDEV(disk->major, disk->first_minor),
 947                               disk->minors);
 948 }
 949
 950 EXPORT_SYMBOL_GPL(ide_unregister_region);
 951
 952 void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
 953 {
 954         ide_hwif_t *hwif = drive->hwif;
 955         unsigned int unit = drive->dn & 1;
 956
 957         disk->major = hwif->major;
 958         disk->first_minor = unit << PARTN_BITS;
 959         sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
 960         disk->queue = drive->queue;
 961 }
 962
 963 EXPORT_SYMBOL_GPL(ide_init_disk);
 964
 965 static void drive_release_dev (struct device *dev)
 966 {
 967         ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
 968
 969         ide_proc_unregister_device(drive);
 970
 971         blk_cleanup_queue(drive->queue);
 972         drive->queue = NULL;
 973
 974         drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 975
 976         complete(&drive->gendev_rel_comp);
 977 }
 978
 979 static int hwif_init(ide_hwif_t *hwif)
 980 {
 981         if (!hwif->irq) {
 982                 printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
 983                 return 0;
 984         }
 985
 986         if (register_blkdev(hwif->major, hwif->name))
 987                 return 0;
 988
 989         if (!hwif->sg_max_nents)
 990                 hwif->sg_max_nents = PRD_ENTRIES;
 991
 992         hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
 993                                  GFP_KERNEL);
 994         if (!hwif->sg_table) {
 995                 printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
 996                 goto out;
 997         }
 998
 999         sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1000
1001         if (init_irq(hwif)) {
1002                 printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
1003                         hwif->name, hwif->irq);
1004                 goto out;
1005         }
1006
1007         blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1008                             THIS_MODULE, ata_probe, ata_lock, hwif);
1009         return 1;
1010
1011 out:
1012         unregister_blkdev(hwif->major, hwif->name);
1013         return 0;
1014 }
1015
1016 static void hwif_register_devices(ide_hwif_t *hwif)
1017 {
1018         ide_drive_t *drive;
1019         unsigned int i;
1020
1021         ide_port_for_each_present_dev(i, drive, hwif) {
1022                 struct device *dev = &drive->gendev;
1023                 int ret;
1024
1025                 dev_set_name(dev, "%u.%u", hwif->index, i);
1026                 dev_set_drvdata(dev, drive);
1027                 dev->parent = &hwif->gendev;
1028                 dev->bus = &ide_bus_type;
1029                 dev->release = drive_release_dev;
1030
1031                 ret = device_register(dev);
1032                 if (ret < 0)
1033                         printk(KERN_WARNING "IDE: %s: device_register error: "
1034                                             "%d\n", __func__, ret);
1035         }
1036 }
1037
1038 static void ide_port_init_devices(ide_hwif_t *hwif)
1039 {
1040         const struct ide_port_ops *port_ops = hwif->port_ops;
1041         ide_drive_t *drive;
1042         int i;
1043
1044         ide_port_for_each_dev(i, drive, hwif) {
1045                 drive->dn = i + hwif->channel * 2;
1046
1047                 if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1048                         drive->io_32bit = 1;
1049                 if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
1050                         drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
1051                 if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1052                         drive->dev_flags |= IDE_DFLAG_UNMASK;
1053                 if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1054                         drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1055
1056                 drive->pio_mode = XFER_PIO_0;
1057
1058                 if (port_ops && port_ops->init_dev)
1059                         port_ops->init_dev(drive);
1060         }
1061 }
1062
1063 static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1064                           const struct ide_port_info *d)
1065 {
1066         hwif->channel = port;
1067
1068         hwif->chipset = d->chipset ? d->chipset : ide_pci;
1069
1070         if (d->init_iops)
1071                 d->init_iops(hwif);
1072
1073         /* ->host_flags may be set by ->init_iops (or even earlier...) */
1074         hwif->host_flags |= d->host_flags;
1075         hwif->pio_mask = d->pio_mask;
1076
1077         if (d->tp_ops)
1078                 hwif->tp_ops = d->tp_ops;
1079
1080         /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1081         if ((hwif->host_flags & IDE_HFLAG_DTC2278) == 0 || hwif->channel == 0)
1082                 hwif->port_ops = d->port_ops;
1083
1084         hwif->swdma_mask = d->swdma_mask;
1085         hwif->mwdma_mask = d->mwdma_mask;
1086         hwif->ultra_mask = d->udma_mask;
1087
1088         if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1089                 int rc;
1090
1091                 hwif->dma_ops = d->dma_ops;
1092
1093                 if (d->init_dma)
1094                         rc = d->init_dma(hwif, d);
1095                 else
1096                         rc = ide_hwif_setup_dma(hwif, d);
1097
1098                 if (rc < 0) {
1099                         printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1100
1101                         hwif->dma_ops = NULL;
1102                         hwif->dma_base = 0;
1103                         hwif->swdma_mask = 0;
1104                         hwif->mwdma_mask = 0;
1105                         hwif->ultra_mask = 0;
1106                 }
1107         }
1108
1109         if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1110             ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
1111                 hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
1112
1113         if (d->max_sectors)
1114                 hwif->rqsize = d->max_sectors;
1115         else {
1116                 if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1117                     (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1118                         hwif->rqsize = 256;
1119                 else
1120                         hwif->rqsize = 65536;
1121         }
1122
1123         /* call chipset specific routine for each enabled port */
1124         if (d->init_hwif)
1125                 d->init_hwif(hwif);
1126 }
1127
1128 static void ide_port_cable_detect(ide_hwif_t *hwif)
1129 {
1130         const struct ide_port_ops *port_ops = hwif->port_ops;
1131
1132         if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1133                 if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1134                         hwif->cbl = port_ops->cable_detect(hwif);
1135         }
1136 }
1137
1138 static const u8 ide_hwif_to_major[] =
1139         { IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
1140           IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
1141
1142 static void ide_port_init_devices_data(ide_hwif_t *hwif)
1143 {
1144         ide_drive_t *drive;
1145         int i;
1146
1147         ide_port_for_each_dev(i, drive, hwif) {
1148                 u8 j = (hwif->index * MAX_DRIVES) + i;
1149                 u16 *saved_id = drive->id;
1150                 struct request *saved_sense_rq = drive->sense_rq;
1151
1152                 memset(drive, 0, sizeof(*drive));
1153                 memset(saved_id, 0, SECTOR_SIZE);
1154                 drive->id = saved_id;
1155                 drive->sense_rq = saved_sense_rq;
1156
1157                 drive->media                    = ide_disk;
1158                 drive->select                   = (i << 4) | ATA_DEVICE_OBS;
1159                 drive->hwif                     = hwif;
1160                 drive->ready_stat               = ATA_DRDY;
1161                 drive->bad_wstat                = BAD_W_STAT;
1162                 drive->special_flags            = IDE_SFLAG_RECALIBRATE |
1163                                                   IDE_SFLAG_SET_GEOMETRY;
1164                 drive->name[0]                  = 'h';
1165                 drive->name[1]                  = 'd';
1166                 drive->name[2]                  = 'a' + j;
1167                 drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
1168
1169                 INIT_LIST_HEAD(&drive->list);
1170                 init_completion(&drive->gendev_rel_comp);
1171         }
1172 }
1173
1174 static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
1175 {
1176         /* fill in any non-zero initial values */
1177         hwif->index     = index;
1178         hwif->major     = ide_hwif_to_major[index];
1179
1180         hwif->name[0]   = 'i';
1181         hwif->name[1]   = 'd';
1182         hwif->name[2]   = 'e';
1183         hwif->name[3]   = '0' + index;
1184
1185         spin_lock_init(&hwif->lock);
1186
1187         setup_timer(&hwif->timer, &ide_timer_expiry, (unsigned long)hwif);
1188
1189         init_completion(&hwif->gendev_rel_comp);
1190
1191         hwif->tp_ops = &default_tp_ops;
1192
1193         ide_port_init_devices_data(hwif);
1194 }
1195
1196 static void ide_init_port_hw(ide_hwif_t *hwif, struct ide_hw *hw)
1197 {
1198         memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
1199         hwif->irq = hw->irq;
1200         hwif->dev = hw->dev;
1201         hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
1202         hwif->config_data = hw->config;
1203 }
1204
1205 static unsigned int ide_indexes;
1206
1207 /**
1208  *      ide_find_port_slot      -       find free port slot
1209  *      @d: IDE port info
1210  *
1211  *      Return the new port slot index or -ENOENT if we are out of free slots.
1212  */
1213
1214 static int ide_find_port_slot(const struct ide_port_info *d)
1215 {
1216         int idx = -ENOENT;
1217         u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1218         u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1219
1220         /*
1221          * Claim an unassigned slot.
1222          *
1223          * Give preference to claiming other slots before claiming ide0/ide1,
1224          * just in case there's another interface yet-to-be-scanned
1225          * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1226          *
1227          * Unless there is a bootable card that does not use the standard
1228          * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1229          */
1230         mutex_lock(&ide_cfg_mtx);
1231         if (bootable) {
1232                 if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1233                         idx = ffz(ide_indexes | i);
1234         } else {
1235                 if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1236                         idx = ffz(ide_indexes | 3);
1237                 else if ((ide_indexes & 3) != 3)
1238                         idx = ffz(ide_indexes);
1239         }
1240         if (idx >= 0)
1241                 ide_indexes |= (1 << idx);
1242         mutex_unlock(&ide_cfg_mtx);
1243
1244         return idx;
1245 }
1246
1247 static void ide_free_port_slot(int idx)
1248 {
1249         mutex_lock(&ide_cfg_mtx);
1250         ide_indexes &= ~(1 << idx);
1251         mutex_unlock(&ide_cfg_mtx);
1252 }
1253
1254 static void ide_port_free_devices(ide_hwif_t *hwif)
1255 {
1256         ide_drive_t *drive;
1257         int i;
1258
1259         ide_port_for_each_dev(i, drive, hwif) {
1260                 kfree(drive->sense_rq);
1261                 kfree(drive->id);
1262                 kfree(drive);
1263         }
1264 }
1265
1266 static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
1267 {
1268         ide_drive_t *drive;
1269         int i;
1270
1271         for (i = 0; i < MAX_DRIVES; i++) {
1272                 drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
1273                 if (drive == NULL)
1274                         goto out_nomem;
1275
1276                 /*
1277                  * In order to keep things simple we have an id
1278                  * block for all drives at all times. If the device
1279                  * is pre ATA or refuses ATA/ATAPI identify we
1280                  * will add faked data to this.
1281                  *
1282                  * Also note that 0 everywhere means "can't do X"
1283                  */
1284                 drive->id = kzalloc_node(SECTOR_SIZE, GFP_KERNEL, node);
1285                 if (drive->id == NULL)
1286                         goto out_free_drive;
1287
1288                 drive->sense_rq = kmalloc(sizeof(struct request) +
1289                                 sizeof(struct ide_request), GFP_KERNEL);
1290                 if (!drive->sense_rq)
1291                         goto out_free_id;
1292
1293                 hwif->devices[i] = drive;
1294         }
1295         return 0;
1296
1297 out_free_id:
1298         kfree(drive->id);
1299 out_free_drive:
1300         kfree(drive);
1301 out_nomem:
1302         ide_port_free_devices(hwif);
1303         return -ENOMEM;
1304 }
1305
1306 struct ide_host *ide_host_alloc(const struct ide_port_info *d,
1307                                 struct ide_hw **hws, unsigned int n_ports)
1308 {
1309         struct ide_host *host;
1310         struct device *dev = hws[0] ? hws[0]->dev : NULL;
1311         int node = dev ? dev_to_node(dev) : -1;
1312         int i;
1313
1314         host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
1315         if (host == NULL)
1316                 return NULL;
1317
1318         for (i = 0; i < n_ports; i++) {
1319                 ide_hwif_t *hwif;
1320                 int idx;
1321
1322                 if (hws[i] == NULL)
1323                         continue;
1324
1325                 hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
1326                 if (hwif == NULL)
1327                         continue;
1328
1329                 if (ide_port_alloc_devices(hwif, node) < 0) {
1330                         kfree(hwif);
1331                         continue;
1332                 }
1333
1334                 idx = ide_find_port_slot(d);
1335                 if (idx < 0) {
1336                         printk(KERN_ERR "%s: no free slot for interface\n",
1337                                         d ? d->name : "ide");
1338                         ide_port_free_devices(hwif);
1339                         kfree(hwif);
1340                         continue;
1341                 }
1342
1343                 ide_init_port_data(hwif, idx);
1344
1345                 hwif->host = host;
1346
1347                 host->ports[i] = hwif;
1348                 host->n_ports++;
1349         }
1350
1351         if (host->n_ports == 0) {
1352                 kfree(host);
1353                 return NULL;
1354         }
1355
1356         host->dev[0] = dev;
1357
1358         if (d) {
1359                 host->init_chipset = d->init_chipset;
1360                 host->get_lock     = d->get_lock;
1361                 host->release_lock = d->release_lock;
1362                 host->host_flags = d->host_flags;
1363                 host->irq_flags = d->irq_flags;
1364         }
1365
1366         return host;
1367 }
1368 EXPORT_SYMBOL_GPL(ide_host_alloc);
1369
1370 static void ide_port_free(ide_hwif_t *hwif)
1371 {
1372         ide_port_free_devices(hwif);
1373         ide_free_port_slot(hwif->index);
1374         kfree(hwif);
1375 }
1376
1377 static void ide_disable_port(ide_hwif_t *hwif)
1378 {
1379         struct ide_host *host = hwif->host;
1380         int i;
1381
1382         printk(KERN_INFO "%s: disabling port\n", hwif->name);
1383
1384         for (i = 0; i < MAX_HOST_PORTS; i++) {
1385                 if (host->ports[i] == hwif) {
1386                         host->ports[i] = NULL;
1387                         host->n_ports--;
1388                 }
1389         }
1390
1391         ide_port_free(hwif);
1392 }
1393
1394 int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1395                       struct ide_hw **hws)
1396 {
1397         ide_hwif_t *hwif, *mate = NULL;
1398         int i, j = 0;
1399
1400         ide_host_for_each_port(i, hwif, host) {
1401                 if (hwif == NULL) {
1402                         mate = NULL;
1403                         continue;
1404                 }
1405
1406                 ide_init_port_hw(hwif, hws[i]);
1407                 ide_port_apply_params(hwif);
1408
1409                 if ((i & 1) && mate) {
1410                         hwif->mate = mate;
1411                         mate->mate = hwif;
1412                 }
1413
1414                 mate = (i & 1) ? NULL : hwif;
1415
1416                 ide_init_port(hwif, i & 1, d);
1417                 ide_port_cable_detect(hwif);
1418
1419                 hwif->port_flags |= IDE_PFLAG_PROBING;
1420
1421                 ide_port_init_devices(hwif);
1422         }
1423
1424         ide_host_for_each_port(i, hwif, host) {
1425                 if (hwif == NULL)
1426                         continue;
1427
1428                 if (ide_probe_port(hwif) == 0)
1429                         hwif->present = 1;
1430
1431                 hwif->port_flags &= ~IDE_PFLAG_PROBING;
1432
1433                 if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 ||
1434                     hwif->mate == NULL || hwif->mate->present == 0) {
1435                         if (ide_register_port(hwif)) {
1436                                 ide_disable_port(hwif);
1437                                 continue;
1438                         }
1439                 }
1440
1441                 if (hwif->present)
1442                         ide_port_tune_devices(hwif);
1443         }
1444
1445         ide_host_enable_irqs(host);
1446
1447         ide_host_for_each_port(i, hwif, host) {
1448                 if (hwif == NULL)
1449                         continue;
1450
1451                 if (hwif_init(hwif) == 0) {
1452                         printk(KERN_INFO "%s: failed to initialize IDE "
1453                                          "interface\n", hwif->name);
1454                         device_unregister(hwif->portdev);
1455                         device_unregister(&hwif->gendev);
1456                         ide_disable_port(hwif);
1457                         continue;
1458                 }
1459
1460                 if (hwif->present)
1461                         if (ide_port_setup_devices(hwif) == 0) {
1462                                 hwif->present = 0;
1463                                 continue;
1464                         }
1465
1466                 j++;
1467
1468                 ide_acpi_init_port(hwif);
1469
1470                 if (hwif->present)
1471                         ide_acpi_port_init_devices(hwif);
1472         }
1473
1474         ide_host_for_each_port(i, hwif, host) {
1475                 if (hwif == NULL)
1476                         continue;
1477
1478                 ide_sysfs_register_port(hwif);
1479                 ide_proc_register_port(hwif);
1480
1481                 if (hwif->present) {
1482                         ide_proc_port_register_devices(hwif);
1483                         hwif_register_devices(hwif);
1484                 }
1485         }
1486
1487         return j ? 0 : -1;
1488 }
1489 EXPORT_SYMBOL_GPL(ide_host_register);
1490
1491 int ide_host_add(const struct ide_port_info *d, struct ide_hw **hws,
1492                  unsigned int n_ports, struct ide_host **hostp)
1493 {
1494         struct ide_host *host;
1495         int rc;
1496
1497         host = ide_host_alloc(d, hws, n_ports);
1498         if (host == NULL)
1499                 return -ENOMEM;
1500
1501         rc = ide_host_register(host, d, hws);
1502         if (rc) {
1503                 ide_host_free(host);
1504                 return rc;
1505         }
1506
1507         if (hostp)
1508                 *hostp = host;
1509
1510         return 0;
1511 }
1512 EXPORT_SYMBOL_GPL(ide_host_add);
1513
1514 static void __ide_port_unregister_devices(ide_hwif_t *hwif)
1515 {
1516         ide_drive_t *drive;
1517         int i;
1518
1519         ide_port_for_each_present_dev(i, drive, hwif) {
1520                 device_unregister(&drive->gendev);
1521                 wait_for_completion(&drive->gendev_rel_comp);
1522         }
1523 }
1524
1525 void ide_port_unregister_devices(ide_hwif_t *hwif)
1526 {
1527         mutex_lock(&ide_cfg_mtx);
1528         __ide_port_unregister_devices(hwif);
1529         hwif->present = 0;
1530         ide_port_init_devices_data(hwif);
1531         mutex_unlock(&ide_cfg_mtx);
1532 }
1533 EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
1534
1535 /**
1536  *      ide_unregister          -       free an IDE interface
1537  *      @hwif: IDE interface
1538  *
1539  *      Perform the final unregister of an IDE interface.
1540  *
1541  *      Locking:
1542  *      The caller must not hold the IDE locks.
1543  *
1544  *      It is up to the caller to be sure there is no pending I/O here,
1545  *      and that the interface will not be reopened (present/vanishing
1546  *      locking isn't yet done BTW).
1547  */
1548
1549 static void ide_unregister(ide_hwif_t *hwif)
1550 {
1551         BUG_ON(in_interrupt());
1552         BUG_ON(irqs_disabled());
1553
1554         mutex_lock(&ide_cfg_mtx);
1555
1556         if (hwif->present) {
1557                 __ide_port_unregister_devices(hwif);
1558                 hwif->present = 0;
1559         }
1560
1561         ide_proc_unregister_port(hwif);
1562
1563         if (!hwif->host->get_lock)
1564                 free_irq(hwif->irq, hwif);
1565
1566         device_unregister(hwif->portdev);
1567         device_unregister(&hwif->gendev);
1568         wait_for_completion(&hwif->gendev_rel_comp);
1569
1570         /*
1571          * Remove us from the kernel's knowledge
1572          */
1573         blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
1574         kfree(hwif->sg_table);
1575         unregister_blkdev(hwif->major, hwif->name);
1576
1577         ide_release_dma_engine(hwif);
1578
1579         mutex_unlock(&ide_cfg_mtx);
1580 }
1581
1582 void ide_host_free(struct ide_host *host)
1583 {
1584         ide_hwif_t *hwif;
1585         int i;
1586
1587         ide_host_for_each_port(i, hwif, host) {
1588                 if (hwif)
1589                         ide_port_free(hwif);
1590         }
1591
1592         kfree(host);
1593 }
1594 EXPORT_SYMBOL_GPL(ide_host_free);
1595
1596 void ide_host_remove(struct ide_host *host)
1597 {
1598         ide_hwif_t *hwif;
1599         int i;
1600
1601         ide_host_for_each_port(i, hwif, host) {
1602                 if (hwif)
1603                         ide_unregister(hwif);
1604         }
1605
1606         ide_host_free(host);
1607 }
1608 EXPORT_SYMBOL_GPL(ide_host_remove);
1609
1610 void ide_port_scan(ide_hwif_t *hwif)
1611 {
1612         int rc;
1613
1614         ide_port_apply_params(hwif);
1615         ide_port_cable_detect(hwif);
1616
1617         hwif->port_flags |= IDE_PFLAG_PROBING;
1618
1619         ide_port_init_devices(hwif);
1620
1621         rc = ide_probe_port(hwif);
1622
1623         hwif->port_flags &= ~IDE_PFLAG_PROBING;
1624
1625         if (rc < 0)
1626                 return;
1627
1628         hwif->present = 1;
1629
1630         ide_port_tune_devices(hwif);
1631         ide_port_setup_devices(hwif);
1632         ide_acpi_port_init_devices(hwif);
1633         hwif_register_devices(hwif);
1634         ide_proc_port_register_devices(hwif);
1635 }
1636 EXPORT_SYMBOL_GPL(ide_port_scan);