linux/drivers/ide/ide-probe.c
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   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 
  51static 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
  60static 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
  86static 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
 104static 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
 123static 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
 191static 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
 250int 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_IDX)
 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
 330int 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
 350static 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
 380static 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
 473static 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
 536static 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
 543static 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, 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, hwif->name);
 563        if (IS_ERR(hwif->portdev)) {
 564                ret = PTR_ERR(hwif->portdev);
 565                device_unregister(&hwif->gendev);
 566        }
 567out:
 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
 597static 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        }
 632out:
 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
 649void 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
 676EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 677
 678static 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
 721static 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/*
 745 * init request queue
 746 */
 747static int ide_init_queue(ide_drive_t *drive)
 748{
 749        struct request_queue *q;
 750        ide_hwif_t *hwif = drive->hwif;
 751        int max_sectors = 256;
 752        int max_sg_entries = PRD_ENTRIES;
 753
 754        /*
 755         *      Our default set up assumes the normal IDE case,
 756         *      that is 64K segmenting, standard PRD setup
 757         *      and LBA28. Some drivers then impose their own
 758         *      limits and LBA48 we could raise it but as yet
 759         *      do not.
 760         */
 761
 762        q = blk_init_queue_node(do_ide_request, NULL, hwif_to_node(hwif));
 763        if (!q)
 764                return 1;
 765
 766        q->queuedata = drive;
 767        blk_queue_segment_boundary(q, 0xffff);
 768
 769        if (hwif->rqsize < max_sectors)
 770                max_sectors = hwif->rqsize;
 771        blk_queue_max_hw_sectors(q, max_sectors);
 772
 773#ifdef CONFIG_PCI
 774        /* When we have an IOMMU, we may have a problem where pci_map_sg()
 775         * creates segments that don't completely match our boundary
 776         * requirements and thus need to be broken up again. Because it
 777         * doesn't align properly either, we may actually have to break up
 778         * to more segments than what was we got in the first place, a max
 779         * worst case is twice as many.
 780         * This will be fixed once we teach pci_map_sg() about our boundary
 781         * requirements, hopefully soon. *FIXME*
 782         */
 783        if (!PCI_DMA_BUS_IS_PHYS)
 784                max_sg_entries >>= 1;
 785#endif /* CONFIG_PCI */
 786
 787        blk_queue_max_segments(q, max_sg_entries);
 788
 789        /* assign drive queue */
 790        drive->queue = q;
 791
 792        /* needs drive->queue to be set */
 793        ide_toggle_bounce(drive, 1);
 794
 795        return 0;
 796}
 797
 798static DEFINE_MUTEX(ide_cfg_mtx);
 799
 800/*
 801 * For any present drive:
 802 * - allocate the block device queue
 803 */
 804static int ide_port_setup_devices(ide_hwif_t *hwif)
 805{
 806        ide_drive_t *drive;
 807        int i, j = 0;
 808
 809        mutex_lock(&ide_cfg_mtx);
 810        ide_port_for_each_present_dev(i, drive, hwif) {
 811                if (ide_init_queue(drive)) {
 812                        printk(KERN_ERR "ide: failed to init %s\n",
 813                                        drive->name);
 814                        drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 815                        continue;
 816                }
 817
 818                j++;
 819        }
 820        mutex_unlock(&ide_cfg_mtx);
 821
 822        return j;
 823}
 824
 825static void ide_host_enable_irqs(struct ide_host *host)
 826{
 827        ide_hwif_t *hwif;
 828        int i;
 829
 830        ide_host_for_each_port(i, hwif, host) {
 831                if (hwif == NULL)
 832                        continue;
 833
 834                /* clear any pending IRQs */
 835                hwif->tp_ops->read_status(hwif);
 836
 837                /* unmask IRQs */
 838                if (hwif->io_ports.ctl_addr)
 839                        hwif->tp_ops->write_devctl(hwif, ATA_DEVCTL_OBS);
 840        }
 841}
 842
 843/*
 844 * This routine sets up the IRQ for an IDE interface.
 845 */
 846static int init_irq (ide_hwif_t *hwif)
 847{
 848        struct ide_io_ports *io_ports = &hwif->io_ports;
 849        struct ide_host *host = hwif->host;
 850        irq_handler_t irq_handler = host->irq_handler;
 851        int sa = host->irq_flags;
 852
 853        if (irq_handler == NULL)
 854                irq_handler = ide_intr;
 855
 856        if (request_irq(hwif->irq, irq_handler, sa, hwif->name, hwif))
 857                goto out_up;
 858
 859#if !defined(__mc68000__)
 860        printk(KERN_INFO "%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
 861                io_ports->data_addr, io_ports->status_addr,
 862                io_ports->ctl_addr, hwif->irq);
 863#else
 864        printk(KERN_INFO "%s at 0x%08lx on irq %d", hwif->name,
 865                io_ports->data_addr, hwif->irq);
 866#endif /* __mc68000__ */
 867        if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
 868                printk(KERN_CONT " (serialized)");
 869        printk(KERN_CONT "\n");
 870
 871        return 0;
 872out_up:
 873        return 1;
 874}
 875
 876static int ata_lock(dev_t dev, void *data)
 877{
 878        /* FIXME: we want to pin hwif down */
 879        return 0;
 880}
 881
 882static struct kobject *ata_probe(dev_t dev, int *part, void *data)
 883{
 884        ide_hwif_t *hwif = data;
 885        int unit = *part >> PARTN_BITS;
 886        ide_drive_t *drive = hwif->devices[unit];
 887
 888        if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
 889                return NULL;
 890
 891        if (drive->media == ide_disk)
 892                request_module("ide-disk");
 893        if (drive->media == ide_cdrom || drive->media == ide_optical)
 894                request_module("ide-cd");
 895        if (drive->media == ide_tape)
 896                request_module("ide-tape");
 897        if (drive->media == ide_floppy)
 898                request_module("ide-floppy");
 899
 900        return NULL;
 901}
 902
 903static struct kobject *exact_match(dev_t dev, int *part, void *data)
 904{
 905        struct gendisk *p = data;
 906        *part &= (1 << PARTN_BITS) - 1;
 907        return &disk_to_dev(p)->kobj;
 908}
 909
 910static int exact_lock(dev_t dev, void *data)
 911{
 912        struct gendisk *p = data;
 913
 914        if (!get_disk(p))
 915                return -1;
 916        return 0;
 917}
 918
 919void ide_register_region(struct gendisk *disk)
 920{
 921        blk_register_region(MKDEV(disk->major, disk->first_minor),
 922                            disk->minors, NULL, exact_match, exact_lock, disk);
 923}
 924
 925EXPORT_SYMBOL_GPL(ide_register_region);
 926
 927void ide_unregister_region(struct gendisk *disk)
 928{
 929        blk_unregister_region(MKDEV(disk->major, disk->first_minor),
 930                              disk->minors);
 931}
 932
 933EXPORT_SYMBOL_GPL(ide_unregister_region);
 934
 935void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
 936{
 937        ide_hwif_t *hwif = drive->hwif;
 938        unsigned int unit = drive->dn & 1;
 939
 940        disk->major = hwif->major;
 941        disk->first_minor = unit << PARTN_BITS;
 942        sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
 943        disk->queue = drive->queue;
 944}
 945
 946EXPORT_SYMBOL_GPL(ide_init_disk);
 947
 948static void drive_release_dev (struct device *dev)
 949{
 950        ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
 951
 952        ide_proc_unregister_device(drive);
 953
 954        blk_cleanup_queue(drive->queue);
 955        drive->queue = NULL;
 956
 957        drive->dev_flags &= ~IDE_DFLAG_PRESENT;
 958
 959        complete(&drive->gendev_rel_comp);
 960}
 961
 962static int hwif_init(ide_hwif_t *hwif)
 963{
 964        if (!hwif->irq) {
 965                printk(KERN_ERR "%s: disabled, no IRQ\n", hwif->name);
 966                return 0;
 967        }
 968
 969        if (register_blkdev(hwif->major, hwif->name))
 970                return 0;
 971
 972        if (!hwif->sg_max_nents)
 973                hwif->sg_max_nents = PRD_ENTRIES;
 974
 975        hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
 976                                 GFP_KERNEL);
 977        if (!hwif->sg_table) {
 978                printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
 979                goto out;
 980        }
 981
 982        sg_init_table(hwif->sg_table, hwif->sg_max_nents);
 983        
 984        if (init_irq(hwif)) {
 985                printk(KERN_ERR "%s: disabled, unable to get IRQ %d\n",
 986                        hwif->name, hwif->irq);
 987                goto out;
 988        }
 989
 990        blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
 991                            THIS_MODULE, ata_probe, ata_lock, hwif);
 992        return 1;
 993
 994out:
 995        unregister_blkdev(hwif->major, hwif->name);
 996        return 0;
 997}
 998
 999static void hwif_register_devices(ide_hwif_t *hwif)
1000{
1001        ide_drive_t *drive;
1002        unsigned int i;
1003
1004        ide_port_for_each_present_dev(i, drive, hwif) {
1005                struct device *dev = &drive->gendev;
1006                int ret;
1007
1008                dev_set_name(dev, "%u.%u", hwif->index, i);
1009                dev_set_drvdata(dev, drive);
1010                dev->parent = &hwif->gendev;
1011                dev->bus = &ide_bus_type;
1012                dev->release = drive_release_dev;
1013
1014                ret = device_register(dev);
1015                if (ret < 0)
1016                        printk(KERN_WARNING "IDE: %s: device_register error: "
1017                                            "%d\n", __func__, ret);
1018        }
1019}
1020
1021static void ide_port_init_devices(ide_hwif_t *hwif)
1022{
1023        const struct ide_port_ops *port_ops = hwif->port_ops;
1024        ide_drive_t *drive;
1025        int i;
1026
1027        ide_port_for_each_dev(i, drive, hwif) {
1028                drive->dn = i + hwif->channel * 2;
1029
1030                if (hwif->host_flags & IDE_HFLAG_IO_32BIT)
1031                        drive->io_32bit = 1;
1032                if (hwif->host_flags & IDE_HFLAG_NO_IO_32BIT)
1033                        drive->dev_flags |= IDE_DFLAG_NO_IO_32BIT;
1034                if (hwif->host_flags & IDE_HFLAG_UNMASK_IRQS)
1035                        drive->dev_flags |= IDE_DFLAG_UNMASK;
1036                if (hwif->host_flags & IDE_HFLAG_NO_UNMASK_IRQS)
1037                        drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
1038
1039                drive->pio_mode = XFER_PIO_0;
1040
1041                if (port_ops && port_ops->init_dev)
1042                        port_ops->init_dev(drive);
1043        }
1044}
1045
1046static void ide_init_port(ide_hwif_t *hwif, unsigned int port,
1047                          const struct ide_port_info *d)
1048{
1049        hwif->channel = port;
1050
1051        hwif->chipset = d->chipset ? d->chipset : ide_pci;
1052
1053        if (d->init_iops)
1054                d->init_iops(hwif);
1055
1056        /* ->host_flags may be set by ->init_iops (or even earlier...) */
1057        hwif->host_flags |= d->host_flags;
1058        hwif->pio_mask = d->pio_mask;
1059
1060        if (d->tp_ops)
1061                hwif->tp_ops = d->tp_ops;
1062
1063        /* ->set_pio_mode for DTC2278 is currently limited to port 0 */
1064        if ((hwif->host_flags & IDE_HFLAG_DTC2278) == 0 || hwif->channel == 0)
1065                hwif->port_ops = d->port_ops;
1066
1067        hwif->swdma_mask = d->swdma_mask;
1068        hwif->mwdma_mask = d->mwdma_mask;
1069        hwif->ultra_mask = d->udma_mask;
1070
1071        if ((d->host_flags & IDE_HFLAG_NO_DMA) == 0) {
1072                int rc;
1073
1074                hwif->dma_ops = d->dma_ops;
1075
1076                if (d->init_dma)
1077                        rc = d->init_dma(hwif, d);
1078                else
1079                        rc = ide_hwif_setup_dma(hwif, d);
1080
1081                if (rc < 0) {
1082                        printk(KERN_INFO "%s: DMA disabled\n", hwif->name);
1083
1084                        hwif->dma_ops = NULL;
1085                        hwif->dma_base = 0;
1086                        hwif->swdma_mask = 0;
1087                        hwif->mwdma_mask = 0;
1088                        hwif->ultra_mask = 0;
1089                }
1090        }
1091
1092        if ((d->host_flags & IDE_HFLAG_SERIALIZE) ||
1093            ((d->host_flags & IDE_HFLAG_SERIALIZE_DMA) && hwif->dma_base))
1094                hwif->host->host_flags |= IDE_HFLAG_SERIALIZE;
1095
1096        if (d->max_sectors)
1097                hwif->rqsize = d->max_sectors;
1098        else {
1099                if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
1100                    (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
1101                        hwif->rqsize = 256;
1102                else
1103                        hwif->rqsize = 65536;
1104        }
1105
1106        /* call chipset specific routine for each enabled port */
1107        if (d->init_hwif)
1108                d->init_hwif(hwif);
1109}
1110
1111static void ide_port_cable_detect(ide_hwif_t *hwif)
1112{
1113        const struct ide_port_ops *port_ops = hwif->port_ops;
1114
1115        if (port_ops && port_ops->cable_detect && (hwif->ultra_mask & 0x78)) {
1116                if (hwif->cbl != ATA_CBL_PATA40_SHORT)
1117                        hwif->cbl = port_ops->cable_detect(hwif);
1118        }
1119}
1120
1121static const u8 ide_hwif_to_major[] =
1122        { IDE0_MAJOR, IDE1_MAJOR, IDE2_MAJOR, IDE3_MAJOR, IDE4_MAJOR,
1123          IDE5_MAJOR, IDE6_MAJOR, IDE7_MAJOR, IDE8_MAJOR, IDE9_MAJOR };
1124
1125static void ide_port_init_devices_data(ide_hwif_t *hwif)
1126{
1127        ide_drive_t *drive;
1128        int i;
1129
1130        ide_port_for_each_dev(i, drive, hwif) {
1131                u8 j = (hwif->index * MAX_DRIVES) + i;
1132                u16 *saved_id = drive->id;
1133
1134                memset(drive, 0, sizeof(*drive));
1135                memset(saved_id, 0, SECTOR_SIZE);
1136                drive->id = saved_id;
1137
1138                drive->media                    = ide_disk;
1139                drive->select                   = (i << 4) | ATA_DEVICE_OBS;
1140                drive->hwif                     = hwif;
1141                drive->ready_stat               = ATA_DRDY;
1142                drive->bad_wstat                = BAD_W_STAT;
1143                drive->special_flags            = IDE_SFLAG_RECALIBRATE |
1144                                                  IDE_SFLAG_SET_GEOMETRY;
1145                drive->name[0]                  = 'h';
1146                drive->name[1]                  = 'd';
1147                drive->name[2]                  = 'a' + j;
1148                drive->max_failures             = IDE_DEFAULT_MAX_FAILURES;
1149
1150                INIT_LIST_HEAD(&drive->list);
1151                init_completion(&drive->gendev_rel_comp);
1152        }
1153}
1154
1155static void ide_init_port_data(ide_hwif_t *hwif, unsigned int index)
1156{
1157        /* fill in any non-zero initial values */
1158        hwif->index     = index;
1159        hwif->major     = ide_hwif_to_major[index];
1160
1161        hwif->name[0]   = 'i';
1162        hwif->name[1]   = 'd';
1163        hwif->name[2]   = 'e';
1164        hwif->name[3]   = '0' + index;
1165
1166        spin_lock_init(&hwif->lock);
1167
1168        init_timer(&hwif->timer);
1169        hwif->timer.function = &ide_timer_expiry;
1170        hwif->timer.data = (unsigned long)hwif;
1171
1172        init_completion(&hwif->gendev_rel_comp);
1173
1174        hwif->tp_ops = &default_tp_ops;
1175
1176        ide_port_init_devices_data(hwif);
1177}
1178
1179static void ide_init_port_hw(ide_hwif_t *hwif, struct ide_hw *hw)
1180{
1181        memcpy(&hwif->io_ports, &hw->io_ports, sizeof(hwif->io_ports));
1182        hwif->irq = hw->irq;
1183        hwif->dev = hw->dev;
1184        hwif->gendev.parent = hw->parent ? hw->parent : hw->dev;
1185        hwif->config_data = hw->config;
1186}
1187
1188static unsigned int ide_indexes;
1189
1190/**
1191 *      ide_find_port_slot      -       find free port slot
1192 *      @d: IDE port info
1193 *
1194 *      Return the new port slot index or -ENOENT if we are out of free slots.
1195 */
1196
1197static int ide_find_port_slot(const struct ide_port_info *d)
1198{
1199        int idx = -ENOENT;
1200        u8 bootable = (d && (d->host_flags & IDE_HFLAG_NON_BOOTABLE)) ? 0 : 1;
1201        u8 i = (d && (d->host_flags & IDE_HFLAG_QD_2ND_PORT)) ? 1 : 0;
1202
1203        /*
1204         * Claim an unassigned slot.
1205         *
1206         * Give preference to claiming other slots before claiming ide0/ide1,
1207         * just in case there's another interface yet-to-be-scanned
1208         * which uses ports 0x1f0/0x170 (the ide0/ide1 defaults).
1209         *
1210         * Unless there is a bootable card that does not use the standard
1211         * ports 0x1f0/0x170 (the ide0/ide1 defaults).
1212         */
1213        mutex_lock(&ide_cfg_mtx);
1214        if (bootable) {
1215                if ((ide_indexes | i) != (1 << MAX_HWIFS) - 1)
1216                        idx = ffz(ide_indexes | i);
1217        } else {
1218                if ((ide_indexes | 3) != (1 << MAX_HWIFS) - 1)
1219                        idx = ffz(ide_indexes | 3);
1220                else if ((ide_indexes & 3) != 3)
1221                        idx = ffz(ide_indexes);
1222        }
1223        if (idx >= 0)
1224                ide_indexes |= (1 << idx);
1225        mutex_unlock(&ide_cfg_mtx);
1226
1227        return idx;
1228}
1229
1230static void ide_free_port_slot(int idx)
1231{
1232        mutex_lock(&ide_cfg_mtx);
1233        ide_indexes &= ~(1 << idx);
1234        mutex_unlock(&ide_cfg_mtx);
1235}
1236
1237static void ide_port_free_devices(ide_hwif_t *hwif)
1238{
1239        ide_drive_t *drive;
1240        int i;
1241
1242        ide_port_for_each_dev(i, drive, hwif) {
1243                kfree(drive->id);
1244                kfree(drive);
1245        }
1246}
1247
1248static int ide_port_alloc_devices(ide_hwif_t *hwif, int node)
1249{
1250        int i;
1251
1252        for (i = 0; i < MAX_DRIVES; i++) {
1253                ide_drive_t *drive;
1254
1255                drive = kzalloc_node(sizeof(*drive), GFP_KERNEL, node);
1256                if (drive == NULL)
1257                        goto out_nomem;
1258
1259                /*
1260                 * In order to keep things simple we have an id
1261                 * block for all drives at all times. If the device
1262                 * is pre ATA or refuses ATA/ATAPI identify we
1263                 * will add faked data to this.
1264                 *
1265                 * Also note that 0 everywhere means "can't do X"
1266                 */
1267                drive->id = kzalloc_node(SECTOR_SIZE, GFP_KERNEL, node);
1268                if (drive->id == NULL)
1269                        goto out_nomem;
1270
1271                hwif->devices[i] = drive;
1272        }
1273        return 0;
1274
1275out_nomem:
1276        ide_port_free_devices(hwif);
1277        return -ENOMEM;
1278}
1279
1280struct ide_host *ide_host_alloc(const struct ide_port_info *d,
1281                                struct ide_hw **hws, unsigned int n_ports)
1282{
1283        struct ide_host *host;
1284        struct device *dev = hws[0] ? hws[0]->dev : NULL;
1285        int node = dev ? dev_to_node(dev) : -1;
1286        int i;
1287
1288        host = kzalloc_node(sizeof(*host), GFP_KERNEL, node);
1289        if (host == NULL)
1290                return NULL;
1291
1292        for (i = 0; i < n_ports; i++) {
1293                ide_hwif_t *hwif;
1294                int idx;
1295
1296                if (hws[i] == NULL)
1297                        continue;
1298
1299                hwif = kzalloc_node(sizeof(*hwif), GFP_KERNEL, node);
1300                if (hwif == NULL)
1301                        continue;
1302
1303                if (ide_port_alloc_devices(hwif, node) < 0) {
1304                        kfree(hwif);
1305                        continue;
1306                }
1307
1308                idx = ide_find_port_slot(d);
1309                if (idx < 0) {
1310                        printk(KERN_ERR "%s: no free slot for interface\n",
1311                                        d ? d->name : "ide");
1312                        ide_port_free_devices(hwif);
1313                        kfree(hwif);
1314                        continue;
1315                }
1316
1317                ide_init_port_data(hwif, idx);
1318
1319                hwif->host = host;
1320
1321                host->ports[i] = hwif;
1322                host->n_ports++;
1323        }
1324
1325        if (host->n_ports == 0) {
1326                kfree(host);
1327                return NULL;
1328        }
1329
1330        host->dev[0] = dev;
1331
1332        if (d) {
1333                host->init_chipset = d->init_chipset;
1334                host->get_lock     = d->get_lock;
1335                host->release_lock = d->release_lock;
1336                host->host_flags = d->host_flags;
1337                host->irq_flags = d->irq_flags;
1338        }
1339
1340        return host;
1341}
1342EXPORT_SYMBOL_GPL(ide_host_alloc);
1343
1344static void ide_port_free(ide_hwif_t *hwif)
1345{
1346        ide_port_free_devices(hwif);
1347        ide_free_port_slot(hwif->index);
1348        kfree(hwif);
1349}
1350
1351static void ide_disable_port(ide_hwif_t *hwif)
1352{
1353        struct ide_host *host = hwif->host;
1354        int i;
1355
1356        printk(KERN_INFO "%s: disabling port\n", hwif->name);
1357
1358        for (i = 0; i < MAX_HOST_PORTS; i++) {
1359                if (host->ports[i] == hwif) {
1360                        host->ports[i] = NULL;
1361                        host->n_ports--;
1362                }
1363        }
1364
1365        ide_port_free(hwif);
1366}
1367
1368int ide_host_register(struct ide_host *host, const struct ide_port_info *d,
1369                      struct ide_hw **hws)
1370{
1371        ide_hwif_t *hwif, *mate = NULL;
1372        int i, j = 0;
1373
1374        ide_host_for_each_port(i, hwif, host) {
1375                if (hwif == NULL) {
1376                        mate = NULL;
1377                        continue;
1378                }
1379
1380                ide_init_port_hw(hwif, hws[i]);
1381                ide_port_apply_params(hwif);
1382
1383                if ((i & 1) && mate) {
1384                        hwif->mate = mate;
1385                        mate->mate = hwif;
1386                }
1387
1388                mate = (i & 1) ? NULL : hwif;
1389
1390                ide_init_port(hwif, i & 1, d);
1391                ide_port_cable_detect(hwif);
1392
1393                hwif->port_flags |= IDE_PFLAG_PROBING;
1394
1395                ide_port_init_devices(hwif);
1396        }
1397
1398        ide_host_for_each_port(i, hwif, host) {
1399                if (hwif == NULL)
1400                        continue;
1401
1402                if (ide_probe_port(hwif) == 0)
1403                        hwif->present = 1;
1404
1405                hwif->port_flags &= ~IDE_PFLAG_PROBING;
1406
1407                if ((hwif->host_flags & IDE_HFLAG_4DRIVES) == 0 ||
1408                    hwif->mate == NULL || hwif->mate->present == 0) {
1409                        if (ide_register_port(hwif)) {
1410                                ide_disable_port(hwif);
1411                                continue;
1412                        }
1413                }
1414
1415                if (hwif->present)
1416                        ide_port_tune_devices(hwif);
1417        }
1418
1419        ide_host_enable_irqs(host);
1420
1421        ide_host_for_each_port(i, hwif, host) {
1422                if (hwif == NULL)
1423                        continue;
1424
1425                if (hwif_init(hwif) == 0) {
1426                        printk(KERN_INFO "%s: failed to initialize IDE "
1427                                         "interface\n", hwif->name);
1428                        device_unregister(&hwif->gendev);
1429                        ide_disable_port(hwif);
1430                        continue;
1431                }
1432
1433                if (hwif->present)
1434                        if (ide_port_setup_devices(hwif) == 0) {
1435                                hwif->present = 0;
1436                                continue;
1437                        }
1438
1439                j++;
1440
1441                ide_acpi_init_port(hwif);
1442
1443                if (hwif->present)
1444                        ide_acpi_port_init_devices(hwif);
1445        }
1446
1447        ide_host_for_each_port(i, hwif, host) {
1448                if (hwif == NULL)
1449                        continue;
1450
1451                ide_sysfs_register_port(hwif);
1452                ide_proc_register_port(hwif);
1453
1454                if (hwif->present) {
1455                        ide_proc_port_register_devices(hwif);
1456                        hwif_register_devices(hwif);
1457                }
1458        }
1459
1460        return j ? 0 : -1;
1461}
1462EXPORT_SYMBOL_GPL(ide_host_register);
1463
1464int ide_host_add(const struct ide_port_info *d, struct ide_hw **hws,
1465                 unsigned int n_ports, struct ide_host **hostp)
1466{
1467        struct ide_host *host;
1468        int rc;
1469
1470        host = ide_host_alloc(d, hws, n_ports);
1471        if (host == NULL)
1472                return -ENOMEM;
1473
1474        rc = ide_host_register(host, d, hws);
1475        if (rc) {
1476                ide_host_free(host);
1477                return rc;
1478        }
1479
1480        if (hostp)
1481                *hostp = host;
1482
1483        return 0;
1484}
1485EXPORT_SYMBOL_GPL(ide_host_add);
1486
1487static void __ide_port_unregister_devices(ide_hwif_t *hwif)
1488{
1489        ide_drive_t *drive;
1490        int i;
1491
1492        ide_port_for_each_present_dev(i, drive, hwif) {
1493                device_unregister(&drive->gendev);
1494                wait_for_completion(&drive->gendev_rel_comp);
1495        }
1496}
1497
1498void ide_port_unregister_devices(ide_hwif_t *hwif)
1499{
1500        mutex_lock(&ide_cfg_mtx);
1501        __ide_port_unregister_devices(hwif);
1502        hwif->present = 0;
1503        ide_port_init_devices_data(hwif);
1504        mutex_unlock(&ide_cfg_mtx);
1505}
1506EXPORT_SYMBOL_GPL(ide_port_unregister_devices);
1507
1508/**
1509 *      ide_unregister          -       free an IDE interface
1510 *      @hwif: IDE interface
1511 *
1512 *      Perform the final unregister of an IDE interface.
1513 *
1514 *      Locking:
1515 *      The caller must not hold the IDE locks.
1516 *
1517 *      It is up to the caller to be sure there is no pending I/O here,
1518 *      and that the interface will not be reopened (present/vanishing
1519 *      locking isn't yet done BTW).
1520 */
1521
1522static void ide_unregister(ide_hwif_t *hwif)
1523{
1524        BUG_ON(in_interrupt());
1525        BUG_ON(irqs_disabled());
1526
1527        mutex_lock(&ide_cfg_mtx);
1528
1529        if (hwif->present) {
1530                __ide_port_unregister_devices(hwif);
1531                hwif->present = 0;
1532        }
1533
1534        ide_proc_unregister_port(hwif);
1535
1536        free_irq(hwif->irq, hwif);
1537
1538        device_unregister(hwif->portdev);
1539        device_unregister(&hwif->gendev);
1540        wait_for_completion(&hwif->gendev_rel_comp);
1541
1542        /*
1543         * Remove us from the kernel's knowledge
1544         */
1545        blk_unregister_region(MKDEV(hwif->major, 0), MAX_DRIVES<<PARTN_BITS);
1546        kfree(hwif->sg_table);
1547        unregister_blkdev(hwif->major, hwif->name);
1548
1549        ide_release_dma_engine(hwif);
1550
1551        mutex_unlock(&ide_cfg_mtx);
1552}
1553
1554void ide_host_free(struct ide_host *host)
1555{
1556        ide_hwif_t *hwif;
1557        int i;
1558
1559        ide_host_for_each_port(i, hwif, host) {
1560                if (hwif)
1561                        ide_port_free(hwif);
1562        }
1563
1564        kfree(host);
1565}
1566EXPORT_SYMBOL_GPL(ide_host_free);
1567
1568void ide_host_remove(struct ide_host *host)
1569{
1570        ide_hwif_t *hwif;
1571        int i;
1572
1573        ide_host_for_each_port(i, hwif, host) {
1574                if (hwif)
1575                        ide_unregister(hwif);
1576        }
1577
1578        ide_host_free(host);
1579}
1580EXPORT_SYMBOL_GPL(ide_host_remove);
1581
1582void ide_port_scan(ide_hwif_t *hwif)
1583{
1584        int rc;
1585
1586        ide_port_apply_params(hwif);
1587        ide_port_cable_detect(hwif);
1588
1589        hwif->port_flags |= IDE_PFLAG_PROBING;
1590
1591        ide_port_init_devices(hwif);
1592
1593        rc = ide_probe_port(hwif);
1594
1595        hwif->port_flags &= ~IDE_PFLAG_PROBING;
1596
1597        if (rc < 0)
1598                return;
1599
1600        hwif->present = 1;
1601
1602        ide_port_tune_devices(hwif);
1603        ide_port_setup_devices(hwif);
1604        ide_acpi_port_init_devices(hwif);
1605        hwif_register_devices(hwif);
1606        ide_proc_port_register_devices(hwif);
1607}
1608EXPORT_SYMBOL_GPL(ide_port_scan);
1609
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