linux/drivers/ide/ide-probe.c
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   1/*
   2 *  linux/drivers/ide/ide-probe.c       Version 1.11    Mar 05, 2003
   3 *
   4 *  Copyright (C) 1994-1998  Linus Torvalds & authors (see below)
   5 */
   6
   7/*
   8 *  Mostly written by Mark Lord <mlord@pobox.com>
   9 *                and Gadi Oxman <gadio@netvision.net.il>
  10 *                and Andre Hedrick <andre@linux-ide.org>
  11 *
  12 *  See linux/MAINTAINERS for address of current maintainer.
  13 *
  14 * This is the IDE probe module, as evolved from hd.c and ide.c.
  15 *
  16 * -- increase WAIT_PIDENTIFY to avoid CD-ROM locking at boot
  17 *       by Andrea Arcangeli
  18 */
  19
  20#include <linux/module.h>
  21#include <linux/types.h>
  22#include <linux/string.h>
  23#include <linux/kernel.h>
  24#include <linux/timer.h>
  25#include <linux/mm.h>
  26#include <linux/interrupt.h>
  27#include <linux/major.h>
  28#include <linux/errno.h>
  29#include <linux/genhd.h>
  30#include <linux/slab.h>
  31#include <linux/delay.h>
  32#include <linux/ide.h>
  33#include <linux/spinlock.h>
  34#include <linux/kmod.h>
  35#include <linux/pci.h>
  36#include <linux/scatterlist.h>
  37
  38#include <asm/byteorder.h>
  39#include <asm/irq.h>
  40#include <asm/uaccess.h>
  41#include <asm/io.h>
  42
  43/**
  44 *      generic_id              -       add a generic drive id
  45 *      @drive: drive to make an ID block for
  46 *      
  47 *      Add a fake id field to the drive we are passed. This allows
  48 *      use to skip a ton of NULL checks (which people always miss) 
  49 *      and make drive properties unconditional outside of this file
  50 */
  51 
  52static void generic_id(ide_drive_t *drive)
  53{
  54        drive->id->cyls = drive->cyl;
  55        drive->id->heads = drive->head;
  56        drive->id->sectors = drive->sect;
  57        drive->id->cur_cyls = drive->cyl;
  58        drive->id->cur_heads = drive->head;
  59        drive->id->cur_sectors = drive->sect;
  60}
  61
  62static void ide_disk_init_chs(ide_drive_t *drive)
  63{
  64        struct hd_driveid *id = drive->id;
  65
  66        /* Extract geometry if we did not already have one for the drive */
  67        if (!drive->cyl || !drive->head || !drive->sect) {
  68                drive->cyl  = drive->bios_cyl  = id->cyls;
  69                drive->head = drive->bios_head = id->heads;
  70                drive->sect = drive->bios_sect = id->sectors;
  71        }
  72
  73        /* Handle logical geometry translation by the drive */
  74        if ((id->field_valid & 1) && id->cur_cyls &&
  75            id->cur_heads && (id->cur_heads <= 16) && id->cur_sectors) {
  76                drive->cyl  = id->cur_cyls;
  77                drive->head = id->cur_heads;
  78                drive->sect = id->cur_sectors;
  79        }
  80
  81        /* Use physical geometry if what we have still makes no sense */
  82        if (drive->head > 16 && id->heads && id->heads <= 16) {
  83                drive->cyl  = id->cyls;
  84                drive->head = id->heads;
  85                drive->sect = id->sectors;
  86        }
  87}
  88
  89static void ide_disk_init_mult_count(ide_drive_t *drive)
  90{
  91        struct hd_driveid *id = drive->id;
  92
  93        drive->mult_count = 0;
  94        if (id->max_multsect) {
  95#ifdef CONFIG_IDEDISK_MULTI_MODE
  96                id->multsect = ((id->max_multsect/2) > 1) ? id->max_multsect : 0;
  97                id->multsect_valid = id->multsect ? 1 : 0;
  98                drive->mult_req = id->multsect_valid ? id->max_multsect : INITIAL_MULT_COUNT;
  99                drive->special.b.set_multmode = drive->mult_req ? 1 : 0;
 100#else   /* original, pre IDE-NFG, per request of AC */
 101                drive->mult_req = INITIAL_MULT_COUNT;
 102                if (drive->mult_req > id->max_multsect)
 103                        drive->mult_req = id->max_multsect;
 104                if (drive->mult_req || ((id->multsect_valid & 1) && id->multsect))
 105                        drive->special.b.set_multmode = 1;
 106#endif
 107        }
 108}
 109
 110/**
 111 *      do_identify     -       identify a drive
 112 *      @drive: drive to identify 
 113 *      @cmd: command used
 114 *
 115 *      Called when we have issued a drive identify command to
 116 *      read and parse the results. This function is run with
 117 *      interrupts disabled. 
 118 */
 119 
 120static inline void do_identify (ide_drive_t *drive, u8 cmd)
 121{
 122        ide_hwif_t *hwif = HWIF(drive);
 123        int bswap = 1;
 124        struct hd_driveid *id;
 125
 126        id = drive->id;
 127        /* read 512 bytes of id info */
 128        hwif->ata_input_data(drive, id, SECTOR_WORDS);
 129
 130        drive->id_read = 1;
 131        local_irq_enable();
 132        ide_fix_driveid(id);
 133
 134#if defined (CONFIG_SCSI_EATA_PIO) || defined (CONFIG_SCSI_EATA)
 135        /*
 136         * EATA SCSI controllers do a hardware ATA emulation:
 137         * Ignore them if there is a driver for them available.
 138         */
 139        if ((id->model[0] == 'P' && id->model[1] == 'M') ||
 140            (id->model[0] == 'S' && id->model[1] == 'K')) {
 141                printk("%s: EATA SCSI HBA %.10s\n", drive->name, id->model);
 142                goto err_misc;
 143        }
 144#endif /* CONFIG_SCSI_EATA || CONFIG_SCSI_EATA_PIO */
 145
 146        /*
 147         *  WIN_IDENTIFY returns little-endian info,
 148         *  WIN_PIDENTIFY *usually* returns little-endian info.
 149         */
 150        if (cmd == WIN_PIDENTIFY) {
 151                if ((id->model[0] == 'N' && id->model[1] == 'E') /* NEC */
 152                 || (id->model[0] == 'F' && id->model[1] == 'X') /* Mitsumi */
 153                 || (id->model[0] == 'P' && id->model[1] == 'i'))/* Pioneer */
 154                        /* Vertos drives may still be weird */
 155                        bswap ^= 1;     
 156        }
 157        ide_fixstring(id->model,     sizeof(id->model),     bswap);
 158        ide_fixstring(id->fw_rev,    sizeof(id->fw_rev),    bswap);
 159        ide_fixstring(id->serial_no, sizeof(id->serial_no), bswap);
 160
 161        /* we depend on this a lot! */
 162        id->model[sizeof(id->model)-1] = '\0';
 163
 164        if (strstr(id->model, "E X A B Y T E N E S T"))
 165                goto err_misc;
 166
 167        printk("%s: %s, ", drive->name, id->model);
 168        drive->present = 1;
 169        drive->dead = 0;
 170
 171        /*
 172         * Check for an ATAPI device
 173         */
 174        if (cmd == WIN_PIDENTIFY) {
 175                u8 type = (id->config >> 8) & 0x1f;
 176                printk("ATAPI ");
 177                switch (type) {
 178                        case ide_floppy:
 179                                if (!strstr(id->model, "CD-ROM")) {
 180                                        if (!strstr(id->model, "oppy") &&
 181                                            !strstr(id->model, "poyp") &&
 182                                            !strstr(id->model, "ZIP"))
 183                                                printk("cdrom or floppy?, assuming ");
 184                                        if (drive->media != ide_cdrom) {
 185                                                printk ("FLOPPY");
 186                                                drive->removable = 1;
 187                                                break;
 188                                        }
 189                                }
 190                                /* Early cdrom models used zero */
 191                                type = ide_cdrom;
 192                        case ide_cdrom:
 193                                drive->removable = 1;
 194#ifdef CONFIG_PPC
 195                                /* kludge for Apple PowerBook internal zip */
 196                                if (!strstr(id->model, "CD-ROM") &&
 197                                    strstr(id->model, "ZIP")) {
 198                                        printk ("FLOPPY");
 199                                        type = ide_floppy;
 200                                        break;
 201                                }
 202#endif
 203                                printk ("CD/DVD-ROM");
 204                                break;
 205                        case ide_tape:
 206                                printk ("TAPE");
 207                                break;
 208                        case ide_optical:
 209                                printk ("OPTICAL");
 210                                drive->removable = 1;
 211                                break;
 212                        default:
 213                                printk("UNKNOWN (type %d)", type);
 214                                break;
 215                }
 216                printk (" drive\n");
 217                drive->media = type;
 218                /* an ATAPI device ignores DRDY */
 219                drive->ready_stat = 0;
 220                return;
 221        }
 222
 223        /*
 224         * Not an ATAPI device: looks like a "regular" hard disk
 225         */
 226
 227        /*
 228         * 0x848a = CompactFlash device
 229         * These are *not* removable in Linux definition of the term
 230         */
 231
 232        if ((id->config != 0x848a) && (id->config & (1<<7)))
 233                drive->removable = 1;
 234
 235        drive->media = ide_disk;
 236        printk("%s DISK drive\n", (id->config == 0x848a) ? "CFA" : "ATA" );
 237        QUIRK_LIST(drive);
 238        return;
 239
 240err_misc:
 241        kfree(id);
 242        drive->present = 0;
 243        return;
 244}
 245
 246/**
 247 *      actual_try_to_identify  -       send ata/atapi identify
 248 *      @drive: drive to identify
 249 *      @cmd: command to use
 250 *
 251 *      try_to_identify() sends an ATA(PI) IDENTIFY request to a drive
 252 *      and waits for a response.  It also monitors irqs while this is
 253 *      happening, in hope of automatically determining which one is
 254 *      being used by the interface.
 255 *
 256 *      Returns:        0  device was identified
 257 *                      1  device timed-out (no response to identify request)
 258 *                      2  device aborted the command (refused to identify itself)
 259 */
 260
 261static int actual_try_to_identify (ide_drive_t *drive, u8 cmd)
 262{
 263        ide_hwif_t *hwif = HWIF(drive);
 264        int rc;
 265        unsigned long hd_status;
 266        unsigned long timeout;
 267        u8 s = 0, a = 0;
 268
 269        /* take a deep breath */
 270        msleep(50);
 271
 272        if (IDE_CONTROL_REG) {
 273                a = hwif->INB(IDE_ALTSTATUS_REG);
 274                s = hwif->INB(IDE_STATUS_REG);
 275                if ((a ^ s) & ~INDEX_STAT) {
 276                        printk(KERN_INFO "%s: probing with STATUS(0x%02x) instead of "
 277                                "ALTSTATUS(0x%02x)\n", drive->name, s, a);
 278                        /* ancient Seagate drives, broken interfaces */
 279                        hd_status = IDE_STATUS_REG;
 280                } else {
 281                        /* use non-intrusive polling */
 282                        hd_status = IDE_ALTSTATUS_REG;
 283                }
 284        } else
 285                hd_status = IDE_STATUS_REG;
 286
 287        /* set features register for atapi
 288         * identify command to be sure of reply
 289         */
 290        if ((cmd == WIN_PIDENTIFY))
 291                /* disable dma & overlap */
 292                hwif->OUTB(0, IDE_FEATURE_REG);
 293
 294        /* ask drive for ID */
 295        hwif->OUTB(cmd, IDE_COMMAND_REG);
 296
 297        timeout = ((cmd == WIN_IDENTIFY) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 298        timeout += jiffies;
 299        do {
 300                if (time_after(jiffies, timeout)) {
 301                        /* drive timed-out */
 302                        return 1;
 303                }
 304                /* give drive a breather */
 305                msleep(50);
 306        } while ((hwif->INB(hd_status)) & BUSY_STAT);
 307
 308        /* wait for IRQ and DRQ_STAT */
 309        msleep(50);
 310        if (OK_STAT((hwif->INB(IDE_STATUS_REG)), DRQ_STAT, BAD_R_STAT)) {
 311                unsigned long flags;
 312
 313                /* local CPU only; some systems need this */
 314                local_irq_save(flags);
 315                /* drive returned ID */
 316                do_identify(drive, cmd);
 317                /* drive responded with ID */
 318                rc = 0;
 319                /* clear drive IRQ */
 320                (void) hwif->INB(IDE_STATUS_REG);
 321                local_irq_restore(flags);
 322        } else {
 323                /* drive refused ID */
 324                rc = 2;
 325        }
 326        return rc;
 327}
 328
 329/**
 330 *      try_to_identify -       try to identify a drive
 331 *      @drive: drive to probe
 332 *      @cmd: command to use
 333 *
 334 *      Issue the identify command and then do IRQ probing to
 335 *      complete the identification when needed by finding the
 336 *      IRQ the drive is attached to
 337 */
 338 
 339static int try_to_identify (ide_drive_t *drive, u8 cmd)
 340{
 341        ide_hwif_t *hwif = HWIF(drive);
 342        int retval;
 343        int autoprobe = 0;
 344        unsigned long cookie = 0;
 345
 346        /*
 347         * Disable device irq unless we need to
 348         * probe for it. Otherwise we'll get spurious
 349         * interrupts during the identify-phase that
 350         * the irq handler isn't expecting.
 351         */
 352        if (IDE_CONTROL_REG) {
 353                u8 ctl = drive->ctl | 2;
 354                if (!hwif->irq) {
 355                        autoprobe = 1;
 356                        cookie = probe_irq_on();
 357                        /* enable device irq */
 358                        ctl &= ~2;
 359                }
 360                hwif->OUTB(ctl, IDE_CONTROL_REG);
 361        }
 362
 363        retval = actual_try_to_identify(drive, cmd);
 364
 365        if (autoprobe) {
 366                int irq;
 367                /* mask device irq */
 368                hwif->OUTB(drive->ctl|2, IDE_CONTROL_REG);
 369                /* clear drive IRQ */
 370                (void) hwif->INB(IDE_STATUS_REG);
 371                udelay(5);
 372                irq = probe_irq_off(cookie);
 373                if (!hwif->irq) {
 374                        if (irq > 0) {
 375                                hwif->irq = irq;
 376                        } else {
 377                                /* Mmmm.. multiple IRQs..
 378                                 * don't know which was ours
 379                                 */
 380                                printk("%s: IRQ probe failed (0x%lx)\n",
 381                                        drive->name, cookie);
 382                        }
 383                }
 384        }
 385        return retval;
 386}
 387
 388
 389/**
 390 *      do_probe                -       probe an IDE device
 391 *      @drive: drive to probe
 392 *      @cmd: command to use
 393 *
 394 *      do_probe() has the difficult job of finding a drive if it exists,
 395 *      without getting hung up if it doesn't exist, without trampling on
 396 *      ethernet cards, and without leaving any IRQs dangling to haunt us later.
 397 *
 398 *      If a drive is "known" to exist (from CMOS or kernel parameters),
 399 *      but does not respond right away, the probe will "hang in there"
 400 *      for the maximum wait time (about 30 seconds), otherwise it will
 401 *      exit much more quickly.
 402 *
 403 * Returns:     0  device was identified
 404 *              1  device timed-out (no response to identify request)
 405 *              2  device aborted the command (refused to identify itself)
 406 *              3  bad status from device (possible for ATAPI drives)
 407 *              4  probe was not attempted because failure was obvious
 408 */
 409
 410static int do_probe (ide_drive_t *drive, u8 cmd)
 411{
 412        int rc;
 413        ide_hwif_t *hwif = HWIF(drive);
 414
 415        if (drive->present) {
 416                /* avoid waiting for inappropriate probes */
 417                if ((drive->media != ide_disk) && (cmd == WIN_IDENTIFY))
 418                        return 4;
 419        }
 420#ifdef DEBUG
 421        printk("probing for %s: present=%d, media=%d, probetype=%s\n",
 422                drive->name, drive->present, drive->media,
 423                (cmd == WIN_IDENTIFY) ? "ATA" : "ATAPI");
 424#endif
 425
 426        /* needed for some systems
 427         * (e.g. crw9624 as drive0 with disk as slave)
 428         */
 429        msleep(50);
 430        SELECT_DRIVE(drive);
 431        msleep(50);
 432        if (hwif->INB(IDE_SELECT_REG) != drive->select.all && !drive->present) {
 433                if (drive->select.b.unit != 0) {
 434                        /* exit with drive0 selected */
 435                        SELECT_DRIVE(&hwif->drives[0]);
 436                        /* allow BUSY_STAT to assert & clear */
 437                        msleep(50);
 438                }
 439                /* no i/f present: mmm.. this should be a 4 -ml */
 440                return 3;
 441        }
 442
 443        if (OK_STAT((hwif->INB(IDE_STATUS_REG)), READY_STAT, BUSY_STAT) ||
 444            drive->present || cmd == WIN_PIDENTIFY) {
 445                /* send cmd and wait */
 446                if ((rc = try_to_identify(drive, cmd))) {
 447                        /* failed: try again */
 448                        rc = try_to_identify(drive,cmd);
 449                }
 450                if (hwif->INB(IDE_STATUS_REG) == (BUSY_STAT|READY_STAT))
 451                        return 4;
 452
 453                if ((rc == 1 && cmd == WIN_PIDENTIFY) &&
 454                        ((drive->autotune == IDE_TUNE_DEFAULT) ||
 455                        (drive->autotune == IDE_TUNE_AUTO))) {
 456                        unsigned long timeout;
 457                        printk("%s: no response (status = 0x%02x), "
 458                                "resetting drive\n", drive->name,
 459                                hwif->INB(IDE_STATUS_REG));
 460                        msleep(50);
 461                        hwif->OUTB(drive->select.all, IDE_SELECT_REG);
 462                        msleep(50);
 463                        hwif->OUTB(WIN_SRST, IDE_COMMAND_REG);
 464                        timeout = jiffies;
 465                        while (((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT) &&
 466                               time_before(jiffies, timeout + WAIT_WORSTCASE))
 467                                msleep(50);
 468                        rc = try_to_identify(drive, cmd);
 469                }
 470                if (rc == 1)
 471                        printk("%s: no response (status = 0x%02x)\n",
 472                                drive->name, hwif->INB(IDE_STATUS_REG));
 473                /* ensure drive irq is clear */
 474                (void) hwif->INB(IDE_STATUS_REG);
 475        } else {
 476                /* not present or maybe ATAPI */
 477                rc = 3;
 478        }
 479        if (drive->select.b.unit != 0) {
 480                /* exit with drive0 selected */
 481                SELECT_DRIVE(&hwif->drives[0]);
 482                msleep(50);
 483                /* ensure drive irq is clear */
 484                (void) hwif->INB(IDE_STATUS_REG);
 485        }
 486        return rc;
 487}
 488
 489/*
 490 *
 491 */
 492static void enable_nest (ide_drive_t *drive)
 493{
 494        ide_hwif_t *hwif = HWIF(drive);
 495        unsigned long timeout;
 496
 497        printk("%s: enabling %s -- ", hwif->name, drive->id->model);
 498        SELECT_DRIVE(drive);
 499        msleep(50);
 500        hwif->OUTB(EXABYTE_ENABLE_NEST, IDE_COMMAND_REG);
 501        timeout = jiffies + WAIT_WORSTCASE;
 502        do {
 503                if (time_after(jiffies, timeout)) {
 504                        printk("failed (timeout)\n");
 505                        return;
 506                }
 507                msleep(50);
 508        } while ((hwif->INB(IDE_STATUS_REG)) & BUSY_STAT);
 509
 510        msleep(50);
 511
 512        if (!OK_STAT((hwif->INB(IDE_STATUS_REG)), 0, BAD_STAT)) {
 513                printk("failed (status = 0x%02x)\n", hwif->INB(IDE_STATUS_REG));
 514        } else {
 515                printk("success\n");
 516        }
 517
 518        /* if !(success||timed-out) */
 519        if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 520                /* look for ATAPI device */
 521                (void) do_probe(drive, WIN_PIDENTIFY);
 522        }
 523}
 524
 525/**
 526 *      probe_for_drives        -       upper level drive probe
 527 *      @drive: drive to probe for
 528 *
 529 *      probe_for_drive() tests for existence of a given drive using do_probe()
 530 *      and presents things to the user as needed.
 531 *
 532 *      Returns:        0  no device was found
 533 *                      1  device was found (note: drive->present might
 534 *                         still be 0)
 535 */
 536 
 537static inline u8 probe_for_drive (ide_drive_t *drive)
 538{
 539        /*
 540         *      In order to keep things simple we have an id
 541         *      block for all drives at all times. If the device
 542         *      is pre ATA or refuses ATA/ATAPI identify we
 543         *      will add faked data to this.
 544         *
 545         *      Also note that 0 everywhere means "can't do X"
 546         */
 547 
 548        drive->id = kzalloc(SECTOR_WORDS *4, GFP_KERNEL);
 549        drive->id_read = 0;
 550        if(drive->id == NULL)
 551        {
 552                printk(KERN_ERR "ide: out of memory for id data.\n");
 553                return 0;
 554        }
 555        strcpy(drive->id->model, "UNKNOWN");
 556        
 557        /* skip probing? */
 558        if (!drive->noprobe)
 559        {
 560                /* if !(success||timed-out) */
 561                if (do_probe(drive, WIN_IDENTIFY) >= 2) {
 562                        /* look for ATAPI device */
 563                        (void) do_probe(drive, WIN_PIDENTIFY);
 564                }
 565                if (!drive->present)
 566                        /* drive not found */
 567                        return 0;
 568                if (strstr(drive->id->model, "E X A B Y T E N E S T"))
 569                        enable_nest(drive);
 570        
 571                /* identification failed? */
 572                if (!drive->id_read) {
 573                        if (drive->media == ide_disk) {
 574                                printk(KERN_INFO "%s: non-IDE drive, CHS=%d/%d/%d\n",
 575                                        drive->name, drive->cyl,
 576                                        drive->head, drive->sect);
 577                        } else if (drive->media == ide_cdrom) {
 578                                printk(KERN_INFO "%s: ATAPI cdrom (?)\n", drive->name);
 579                        } else {
 580                                /* nuke it */
 581                                printk(KERN_WARNING "%s: Unknown device on bus refused identification. Ignoring.\n", drive->name);
 582                                drive->present = 0;
 583                        }
 584                }
 585                /* drive was found */
 586        }
 587        if(!drive->present)
 588                return 0;
 589        /* The drive wasn't being helpful. Add generic info only */
 590        if (drive->id_read == 0) {
 591                generic_id(drive);
 592                return 1;
 593        }
 594
 595        if (drive->media == ide_disk) {
 596                ide_disk_init_chs(drive);
 597                ide_disk_init_mult_count(drive);
 598        }
 599
 600        return drive->present;
 601}
 602
 603static void hwif_release_dev (struct device *dev)
 604{
 605        ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 606
 607        complete(&hwif->gendev_rel_comp);
 608}
 609
 610static void hwif_register (ide_hwif_t *hwif)
 611{
 612        int ret;
 613
 614        /* register with global device tree */
 615        strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 616        hwif->gendev.driver_data = hwif;
 617        if (hwif->gendev.parent == NULL) {
 618                if (hwif->pci_dev)
 619                        hwif->gendev.parent = &hwif->pci_dev->dev;
 620                else
 621                        /* Would like to do = &device_legacy */
 622                        hwif->gendev.parent = NULL;
 623        }
 624        hwif->gendev.release = hwif_release_dev;
 625        ret = device_register(&hwif->gendev);
 626        if (ret < 0)
 627                printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
 628                        __FUNCTION__, ret);
 629}
 630
 631static int wait_hwif_ready(ide_hwif_t *hwif)
 632{
 633        int unit, rc;
 634
 635        printk(KERN_DEBUG "Probing IDE interface %s...\n", hwif->name);
 636
 637        /* Let HW settle down a bit from whatever init state we
 638         * come from */
 639        mdelay(2);
 640
 641        /* Wait for BSY bit to go away, spec timeout is 30 seconds,
 642         * I know of at least one disk who takes 31 seconds, I use 35
 643         * here to be safe
 644         */
 645        rc = ide_wait_not_busy(hwif, 35000);
 646        if (rc)
 647                return rc;
 648
 649        /* Now make sure both master & slave are ready */
 650        for (unit = 0; unit < MAX_DRIVES; unit++) {
 651                ide_drive_t *drive = &hwif->drives[unit];
 652
 653                /* Ignore disks that we will not probe for later. */
 654                if (!drive->noprobe || drive->present) {
 655                        SELECT_DRIVE(drive);
 656                        if (IDE_CONTROL_REG)
 657                                hwif->OUTB(drive->ctl, IDE_CONTROL_REG);
 658                        mdelay(2);
 659                        rc = ide_wait_not_busy(hwif, 35000);
 660                        if (rc)
 661                                goto out;
 662                } else
 663                        printk(KERN_DEBUG "%s: ide_wait_not_busy() skipped\n",
 664                                          drive->name);
 665        }
 666out:
 667        /* Exit function with master reselected (let's be sane) */
 668        if (unit)
 669                SELECT_DRIVE(&hwif->drives[0]);
 670
 671        return rc;
 672}
 673
 674/**
 675 *      ide_undecoded_slave     -       look for bad CF adapters
 676 *      @hwif: interface
 677 *
 678 *      Analyse the drives on the interface and attempt to decide if we
 679 *      have the same drive viewed twice. This occurs with crap CF adapters
 680 *      and PCMCIA sometimes.
 681 */
 682
 683void ide_undecoded_slave(ide_hwif_t *hwif)
 684{
 685        ide_drive_t *drive0 = &hwif->drives[0];
 686        ide_drive_t *drive1 = &hwif->drives[1];
 687
 688        if (drive0->present == 0 || drive1->present == 0)
 689                return;
 690
 691        /* If the models don't match they are not the same product */
 692        if (strcmp(drive0->id->model, drive1->id->model))
 693                return;
 694
 695        /* Serial numbers do not match */
 696        if (strncmp(drive0->id->serial_no, drive1->id->serial_no, 20))
 697                return;
 698
 699        /* No serial number, thankfully very rare for CF */
 700        if (drive0->id->serial_no[0] == 0)
 701                return;
 702
 703        /* Appears to be an IDE flash adapter with decode bugs */
 704        printk(KERN_WARNING "ide-probe: ignoring undecoded slave\n");
 705
 706        drive1->present = 0;
 707}
 708
 709EXPORT_SYMBOL_GPL(ide_undecoded_slave);
 710
 711/*
 712 * This routine only knows how to look for drive units 0 and 1
 713 * on an interface, so any setting of MAX_DRIVES > 2 won't work here.
 714 */
 715static void probe_hwif(ide_hwif_t *hwif)
 716{
 717        unsigned long flags;
 718        unsigned int irqd;
 719        int unit;
 720
 721        if (hwif->noprobe)
 722                return;
 723
 724        if ((hwif->chipset != ide_4drives || !hwif->mate || !hwif->mate->present) &&
 725            (ide_hwif_request_regions(hwif))) {
 726                u16 msgout = 0;
 727                for (unit = 0; unit < MAX_DRIVES; ++unit) {
 728                        ide_drive_t *drive = &hwif->drives[unit];
 729                        if (drive->present) {
 730                                drive->present = 0;
 731                                printk(KERN_ERR "%s: ERROR, PORTS ALREADY IN USE\n",
 732                                        drive->name);
 733                                msgout = 1;
 734                        }
 735                }
 736                if (!msgout)
 737                        printk(KERN_ERR "%s: ports already in use, skipping probe\n",
 738                                hwif->name);
 739                return; 
 740        }
 741
 742        /*
 743         * We must always disable IRQ, as probe_for_drive will assert IRQ, but
 744         * we'll install our IRQ driver much later...
 745         */
 746        irqd = hwif->irq;
 747        if (irqd)
 748                disable_irq(hwif->irq);
 749
 750        local_irq_set(flags);
 751
 752        /* This is needed on some PPCs and a bunch of BIOS-less embedded
 753         * platforms. Typical cases are:
 754         * 
 755         *  - The firmware hard reset the disk before booting the kernel,
 756         *    the drive is still doing it's poweron-reset sequence, that
 757         *    can take up to 30 seconds
 758         *  - The firmware does nothing (or no firmware), the device is
 759         *    still in POST state (same as above actually).
 760         *  - Some CD/DVD/Writer combo drives tend to drive the bus during
 761         *    their reset sequence even when they are non-selected slave
 762         *    devices, thus preventing discovery of the main HD
 763         *    
 764         *  Doing this wait-for-busy should not harm any existing configuration
 765         *  (at least things won't be worse than what current code does, that
 766         *  is blindly go & talk to the drive) and fix some issues like the
 767         *  above.
 768         *  
 769         *  BenH.
 770         */
 771        if (wait_hwif_ready(hwif) == -EBUSY)
 772                printk(KERN_DEBUG "%s: Wait for ready failed before probe !\n", hwif->name);
 773
 774        /*
 775         * Need to probe slave device first to make it release PDIAG-.
 776         */
 777        for (unit = MAX_DRIVES - 1; unit >= 0; unit--) {
 778                ide_drive_t *drive = &hwif->drives[unit];
 779                drive->dn = (hwif->channel ? 2 : 0) + unit;
 780                (void) probe_for_drive(drive);
 781                if (drive->present && !hwif->present) {
 782                        hwif->present = 1;
 783                        if (hwif->chipset != ide_4drives ||
 784                            !hwif->mate || 
 785                            !hwif->mate->present) {
 786                                hwif_register(hwif);
 787                        }
 788                }
 789        }
 790        if (hwif->io_ports[IDE_CONTROL_OFFSET] && hwif->reset) {
 791                unsigned long timeout = jiffies + WAIT_WORSTCASE;
 792                u8 stat;
 793
 794                printk(KERN_WARNING "%s: reset\n", hwif->name);
 795                hwif->OUTB(12, hwif->io_ports[IDE_CONTROL_OFFSET]);
 796                udelay(10);
 797                hwif->OUTB(8, hwif->io_ports[IDE_CONTROL_OFFSET]);
 798                do {
 799                        msleep(50);
 800                        stat = hwif->INB(hwif->io_ports[IDE_STATUS_OFFSET]);
 801                } while ((stat & BUSY_STAT) && time_after(timeout, jiffies));
 802
 803        }
 804        local_irq_restore(flags);
 805        /*
 806         * Use cached IRQ number. It might be (and is...) changed by probe
 807         * code above
 808         */
 809        if (irqd)
 810                enable_irq(irqd);
 811
 812        if (!hwif->present) {
 813                ide_hwif_release_regions(hwif);
 814                return;
 815        }
 816
 817        if (hwif->fixup)
 818                hwif->fixup(hwif);
 819
 820        for (unit = 0; unit < MAX_DRIVES; ++unit) {
 821                ide_drive_t *drive = &hwif->drives[unit];
 822
 823                if (drive->present) {
 824                        if (drive->autotune == IDE_TUNE_AUTO)
 825                                ide_set_max_pio(drive);
 826
 827                        if (drive->autotune != IDE_TUNE_DEFAULT &&
 828                            drive->autotune != IDE_TUNE_AUTO)
 829                                continue;
 830
 831                        drive->nice1 = 1;
 832
 833                        if (hwif->ide_dma_on) {
 834                                /*
 835                                 * Force DMAing for the beginning of the check.
 836                                 * Some chipsets appear to do interesting
 837                                 * things, if not checked and cleared.
 838                                 *   PARANOIA!!!
 839                                 */
 840                                hwif->dma_off_quietly(drive);
 841                                ide_set_dma(drive);
 842                        }
 843                }
 844        }
 845
 846        for (unit = 0; unit < MAX_DRIVES; ++unit) {
 847                ide_drive_t *drive = &hwif->drives[unit];
 848
 849                if (hwif->no_io_32bit)
 850                        drive->no_io_32bit = 1;
 851                else
 852                        drive->no_io_32bit = drive->id->dword_io ? 1 : 0;
 853        }
 854}
 855
 856static int hwif_init(ide_hwif_t *hwif);
 857static void hwif_register_devices(ide_hwif_t *hwif);
 858
 859static int probe_hwif_init(ide_hwif_t *hwif)
 860{
 861        probe_hwif(hwif);
 862
 863        if (!hwif_init(hwif)) {
 864                printk(KERN_INFO "%s: failed to initialize IDE interface\n",
 865                                 hwif->name);
 866                return -1;
 867        }
 868
 869        if (hwif->present)
 870                hwif_register_devices(hwif);
 871
 872        return 0;
 873}
 874
 875#if MAX_HWIFS > 1
 876/*
 877 * save_match() is used to simplify logic in init_irq() below.
 878 *
 879 * A loophole here is that we may not know about a particular
 880 * hwif's irq until after that hwif is actually probed/initialized..
 881 * This could be a problem for the case where an hwif is on a
 882 * dual interface that requires serialization (eg. cmd640) and another
 883 * hwif using one of the same irqs is initialized beforehand.
 884 *
 885 * This routine detects and reports such situations, but does not fix them.
 886 */
 887static void save_match(ide_hwif_t *hwif, ide_hwif_t *new, ide_hwif_t **match)
 888{
 889        ide_hwif_t *m = *match;
 890
 891        if (m && m->hwgroup && m->hwgroup != new->hwgroup) {
 892                if (!new->hwgroup)
 893                        return;
 894                printk("%s: potential irq problem with %s and %s\n",
 895                        hwif->name, new->name, m->name);
 896        }
 897        if (!m || m->irq != hwif->irq) /* don't undo a prior perfect match */
 898                *match = new;
 899}
 900#endif /* MAX_HWIFS > 1 */
 901
 902/*
 903 * init request queue
 904 */
 905static int ide_init_queue(ide_drive_t *drive)
 906{
 907        struct request_queue *q;
 908        ide_hwif_t *hwif = HWIF(drive);
 909        int max_sectors = 256;
 910        int max_sg_entries = PRD_ENTRIES;
 911
 912        /*
 913         *      Our default set up assumes the normal IDE case,
 914         *      that is 64K segmenting, standard PRD setup
 915         *      and LBA28. Some drivers then impose their own
 916         *      limits and LBA48 we could raise it but as yet
 917         *      do not.
 918         */
 919
 920        q = blk_init_queue_node(do_ide_request, &ide_lock, hwif_to_node(hwif));
 921        if (!q)
 922                return 1;
 923
 924        q->queuedata = drive;
 925        blk_queue_segment_boundary(q, 0xffff);
 926
 927        if (!hwif->rqsize) {
 928                if ((hwif->host_flags & IDE_HFLAG_NO_LBA48) ||
 929                    (hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA))
 930                        hwif->rqsize = 256;
 931                else
 932                        hwif->rqsize = 65536;
 933        }
 934        if (hwif->rqsize < max_sectors)
 935                max_sectors = hwif->rqsize;
 936        blk_queue_max_sectors(q, max_sectors);
 937
 938#ifdef CONFIG_PCI
 939        /* When we have an IOMMU, we may have a problem where pci_map_sg()
 940         * creates segments that don't completely match our boundary
 941         * requirements and thus need to be broken up again. Because it
 942         * doesn't align properly either, we may actually have to break up
 943         * to more segments than what was we got in the first place, a max
 944         * worst case is twice as many.
 945         * This will be fixed once we teach pci_map_sg() about our boundary
 946         * requirements, hopefully soon. *FIXME*
 947         */
 948        if (!PCI_DMA_BUS_IS_PHYS)
 949                max_sg_entries >>= 1;
 950#endif /* CONFIG_PCI */
 951
 952        blk_queue_max_hw_segments(q, max_sg_entries);
 953        blk_queue_max_phys_segments(q, max_sg_entries);
 954
 955        /* assign drive queue */
 956        drive->queue = q;
 957
 958        /* needs drive->queue to be set */
 959        ide_toggle_bounce(drive, 1);
 960
 961        return 0;
 962}
 963
 964/*
 965 * This routine sets up the irq for an ide interface, and creates a new
 966 * hwgroup for the irq/hwif if none was previously assigned.
 967 *
 968 * Much of the code is for correctly detecting/handling irq sharing
 969 * and irq serialization situations.  This is somewhat complex because
 970 * it handles static as well as dynamic (PCMCIA) IDE interfaces.
 971 *
 972 * The IRQF_DISABLED in sa_flags means ide_intr() is always entered with
 973 * interrupts completely disabled.  This can be bad for interrupt latency,
 974 * but anything else has led to problems on some machines.  We re-enable
 975 * interrupts as much as we can safely do in most places.
 976 */
 977static int init_irq (ide_hwif_t *hwif)
 978{
 979        unsigned int index;
 980        ide_hwgroup_t *hwgroup;
 981        ide_hwif_t *match = NULL;
 982
 983
 984        BUG_ON(in_interrupt());
 985        BUG_ON(irqs_disabled());        
 986        BUG_ON(hwif == NULL);
 987
 988        mutex_lock(&ide_cfg_mtx);
 989        hwif->hwgroup = NULL;
 990#if MAX_HWIFS > 1
 991        /*
 992         * Group up with any other hwifs that share our irq(s).
 993         */
 994        for (index = 0; index < MAX_HWIFS; index++) {
 995                ide_hwif_t *h = &ide_hwifs[index];
 996                if (h->hwgroup) {  /* scan only initialized hwif's */
 997                        if (hwif->irq == h->irq) {
 998                                hwif->sharing_irq = h->sharing_irq = 1;
 999                                if (hwif->chipset != ide_pci ||
1000                                    h->chipset != ide_pci) {
1001                                        save_match(hwif, h, &match);
1002                                }
1003                        }
1004                        if (hwif->serialized) {
1005                                if (hwif->mate && hwif->mate->irq == h->irq)
1006                                        save_match(hwif, h, &match);
1007                        }
1008                        if (h->serialized) {
1009                                if (h->mate && hwif->irq == h->mate->irq)
1010                                        save_match(hwif, h, &match);
1011                        }
1012                }
1013        }
1014#endif /* MAX_HWIFS > 1 */
1015        /*
1016         * If we are still without a hwgroup, then form a new one
1017         */
1018        if (match) {
1019                hwgroup = match->hwgroup;
1020                hwif->hwgroup = hwgroup;
1021                /*
1022                 * Link us into the hwgroup.
1023                 * This must be done early, do ensure that unexpected_intr
1024                 * can find the hwif and prevent irq storms.
1025                 * No drives are attached to the new hwif, choose_drive
1026                 * can't do anything stupid (yet).
1027                 * Add ourself as the 2nd entry to the hwgroup->hwif
1028                 * linked list, the first entry is the hwif that owns
1029                 * hwgroup->handler - do not change that.
1030                 */
1031                spin_lock_irq(&ide_lock);
1032                hwif->next = hwgroup->hwif->next;
1033                hwgroup->hwif->next = hwif;
1034                spin_unlock_irq(&ide_lock);
1035        } else {
1036                hwgroup = kmalloc_node(sizeof(ide_hwgroup_t),
1037                                        GFP_KERNEL | __GFP_ZERO,
1038                                        hwif_to_node(hwif->drives[0].hwif));
1039                if (!hwgroup)
1040                        goto out_up;
1041
1042                hwif->hwgroup = hwgroup;
1043
1044                hwgroup->hwif     = hwif->next = hwif;
1045                hwgroup->rq       = NULL;
1046                hwgroup->handler  = NULL;
1047                hwgroup->drive    = NULL;
1048                hwgroup->busy     = 0;
1049                init_timer(&hwgroup->timer);
1050                hwgroup->timer.function = &ide_timer_expiry;
1051                hwgroup->timer.data = (unsigned long) hwgroup;
1052        }
1053
1054        /*
1055         * Allocate the irq, if not already obtained for another hwif
1056         */
1057        if (!match || match->irq != hwif->irq) {
1058                int sa = IRQF_DISABLED;
1059#if defined(__mc68000__) || defined(CONFIG_APUS)
1060                sa = IRQF_SHARED;
1061#endif /* __mc68000__ || CONFIG_APUS */
1062
1063                if (IDE_CHIPSET_IS_PCI(hwif->chipset)) {
1064                        sa = IRQF_SHARED;
1065#ifndef CONFIG_IDEPCI_SHARE_IRQ
1066                        sa |= IRQF_DISABLED;
1067#endif /* CONFIG_IDEPCI_SHARE_IRQ */
1068                }
1069
1070                if (hwif->io_ports[IDE_CONTROL_OFFSET])
1071                        /* clear nIEN */
1072                        hwif->OUTB(0x08, hwif->io_ports[IDE_CONTROL_OFFSET]);
1073
1074                if (request_irq(hwif->irq,&ide_intr,sa,hwif->name,hwgroup))
1075                        goto out_unlink;
1076        }
1077
1078        /*
1079         * For any present drive:
1080         * - allocate the block device queue
1081         * - link drive into the hwgroup
1082         */
1083        for (index = 0; index < MAX_DRIVES; ++index) {
1084                ide_drive_t *drive = &hwif->drives[index];
1085                if (!drive->present)
1086                        continue;
1087                if (ide_init_queue(drive)) {
1088                        printk(KERN_ERR "ide: failed to init %s\n",drive->name);
1089                        continue;
1090                }
1091                spin_lock_irq(&ide_lock);
1092                if (!hwgroup->drive) {
1093                        /* first drive for hwgroup. */
1094                        drive->next = drive;
1095                        hwgroup->drive = drive;
1096                        hwgroup->hwif = HWIF(hwgroup->drive);
1097                } else {
1098                        drive->next = hwgroup->drive->next;
1099                        hwgroup->drive->next = drive;
1100                }
1101                spin_unlock_irq(&ide_lock);
1102        }
1103
1104#if !defined(__mc68000__) && !defined(CONFIG_APUS)
1105        printk("%s at 0x%03lx-0x%03lx,0x%03lx on irq %d", hwif->name,
1106                hwif->io_ports[IDE_DATA_OFFSET],
1107                hwif->io_ports[IDE_DATA_OFFSET]+7,
1108                hwif->io_ports[IDE_CONTROL_OFFSET], hwif->irq);
1109#else
1110        printk("%s at 0x%08lx on irq %d", hwif->name,
1111                hwif->io_ports[IDE_DATA_OFFSET], hwif->irq);
1112#endif /* __mc68000__ && CONFIG_APUS */
1113        if (match)
1114                printk(" (%sed with %s)",
1115                        hwif->sharing_irq ? "shar" : "serializ", match->name);
1116        printk("\n");
1117        mutex_unlock(&ide_cfg_mtx);
1118        return 0;
1119out_unlink:
1120        spin_lock_irq(&ide_lock);
1121        if (hwif->next == hwif) {
1122                BUG_ON(match);
1123                BUG_ON(hwgroup->hwif != hwif);
1124                kfree(hwgroup);
1125        } else {
1126                ide_hwif_t *g;
1127                g = hwgroup->hwif;
1128                while (g->next != hwif)
1129                        g = g->next;
1130                g->next = hwif->next;
1131                if (hwgroup->hwif == hwif) {
1132                        /* Impossible. */
1133                        printk(KERN_ERR "Duh. Uninitialized hwif listed as active hwif.\n");
1134                        hwgroup->hwif = g;
1135                }
1136                BUG_ON(hwgroup->hwif == hwif);
1137        }
1138        spin_unlock_irq(&ide_lock);
1139out_up:
1140        mutex_unlock(&ide_cfg_mtx);
1141        return 1;
1142}
1143
1144static int ata_lock(dev_t dev, void *data)
1145{
1146        /* FIXME: we want to pin hwif down */
1147        return 0;
1148}
1149
1150static struct kobject *ata_probe(dev_t dev, int *part, void *data)
1151{
1152        ide_hwif_t *hwif = data;
1153        int unit = *part >> PARTN_BITS;
1154        ide_drive_t *drive = &hwif->drives[unit];
1155        if (!drive->present)
1156                return NULL;
1157
1158        if (drive->media == ide_disk)
1159                request_module("ide-disk");
1160        if (drive->scsi)
1161                request_module("ide-scsi");
1162        if (drive->media == ide_cdrom || drive->media == ide_optical)
1163                request_module("ide-cd");
1164        if (drive->media == ide_tape)
1165                request_module("ide-tape");
1166        if (drive->media == ide_floppy)
1167                request_module("ide-floppy");
1168
1169        return NULL;
1170}
1171
1172static struct kobject *exact_match(dev_t dev, int *part, void *data)
1173{
1174        struct gendisk *p = data;
1175        *part &= (1 << PARTN_BITS) - 1;
1176        return &p->kobj;
1177}
1178
1179static int exact_lock(dev_t dev, void *data)
1180{
1181        struct gendisk *p = data;
1182
1183        if (!get_disk(p))
1184                return -1;
1185        return 0;
1186}
1187
1188void ide_register_region(struct gendisk *disk)
1189{
1190        blk_register_region(MKDEV(disk->major, disk->first_minor),
1191                            disk->minors, NULL, exact_match, exact_lock, disk);
1192}
1193
1194EXPORT_SYMBOL_GPL(ide_register_region);
1195
1196void ide_unregister_region(struct gendisk *disk)
1197{
1198        blk_unregister_region(MKDEV(disk->major, disk->first_minor),
1199                              disk->minors);
1200}
1201
1202EXPORT_SYMBOL_GPL(ide_unregister_region);
1203
1204void ide_init_disk(struct gendisk *disk, ide_drive_t *drive)
1205{
1206        ide_hwif_t *hwif = drive->hwif;
1207        unsigned int unit = (drive->select.all >> 4) & 1;
1208
1209        disk->major = hwif->major;
1210        disk->first_minor = unit << PARTN_BITS;
1211        sprintf(disk->disk_name, "hd%c", 'a' + hwif->index * MAX_DRIVES + unit);
1212        disk->queue = drive->queue;
1213}
1214
1215EXPORT_SYMBOL_GPL(ide_init_disk);
1216
1217static void ide_remove_drive_from_hwgroup(ide_drive_t *drive)
1218{
1219        ide_hwgroup_t *hwgroup = drive->hwif->hwgroup;
1220
1221        if (drive == drive->next) {
1222                /* special case: last drive from hwgroup. */
1223                BUG_ON(hwgroup->drive != drive);
1224                hwgroup->drive = NULL;
1225        } else {
1226                ide_drive_t *walk;
1227
1228                walk = hwgroup->drive;
1229                while (walk->next != drive)
1230                        walk = walk->next;
1231                walk->next = drive->next;
1232                if (hwgroup->drive == drive) {
1233                        hwgroup->drive = drive->next;
1234                        hwgroup->hwif = hwgroup->drive->hwif;
1235                }
1236        }
1237        BUG_ON(hwgroup->drive == drive);
1238}
1239
1240static void drive_release_dev (struct device *dev)
1241{
1242        ide_drive_t *drive = container_of(dev, ide_drive_t, gendev);
1243
1244        spin_lock_irq(&ide_lock);
1245        ide_remove_drive_from_hwgroup(drive);
1246        kfree(drive->id);
1247        drive->id = NULL;
1248        drive->present = 0;
1249        /* Messed up locking ... */
1250        spin_unlock_irq(&ide_lock);
1251        blk_cleanup_queue(drive->queue);
1252        spin_lock_irq(&ide_lock);
1253        drive->queue = NULL;
1254        spin_unlock_irq(&ide_lock);
1255
1256        complete(&drive->gendev_rel_comp);
1257}
1258
1259/*
1260 * init_gendisk() (as opposed to ide_geninit) is called for each major device,
1261 * after probing for drives, to allocate partition tables and other data
1262 * structures needed for the routines in genhd.c.  ide_geninit() gets called
1263 * somewhat later, during the partition check.
1264 */
1265static void init_gendisk (ide_hwif_t *hwif)
1266{
1267        unsigned int unit;
1268
1269        for (unit = 0; unit < MAX_DRIVES; ++unit) {
1270                ide_drive_t * drive = &hwif->drives[unit];
1271                ide_add_generic_settings(drive);
1272                snprintf(drive->gendev.bus_id,BUS_ID_SIZE,"%u.%u",
1273                         hwif->index,unit);
1274                drive->gendev.parent = &hwif->gendev;
1275                drive->gendev.bus = &ide_bus_type;
1276                drive->gendev.driver_data = drive;
1277                drive->gendev.release = drive_release_dev;
1278        }
1279        blk_register_region(MKDEV(hwif->major, 0), MAX_DRIVES << PARTN_BITS,
1280                        THIS_MODULE, ata_probe, ata_lock, hwif);
1281}
1282
1283static int hwif_init(ide_hwif_t *hwif)
1284{
1285        int old_irq;
1286
1287        /* Return success if no device is connected */
1288        if (!hwif->present)
1289                return 1;
1290
1291        if (!hwif->irq) {
1292                if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET])))
1293                {
1294                        printk("%s: DISABLED, NO IRQ\n", hwif->name);
1295                        return (hwif->present = 0);
1296                }
1297        }
1298#ifdef CONFIG_BLK_DEV_HD
1299        if (hwif->irq == HD_IRQ && hwif->io_ports[IDE_DATA_OFFSET] != HD_DATA) {
1300                printk("%s: CANNOT SHARE IRQ WITH OLD "
1301                        "HARDDISK DRIVER (hd.c)\n", hwif->name);
1302                return (hwif->present = 0);
1303        }
1304#endif /* CONFIG_BLK_DEV_HD */
1305
1306        /* we set it back to 1 if all is ok below */    
1307        hwif->present = 0;
1308
1309        if (register_blkdev(hwif->major, hwif->name))
1310                return 0;
1311
1312        if (!hwif->sg_max_nents)
1313                hwif->sg_max_nents = PRD_ENTRIES;
1314
1315        hwif->sg_table = kmalloc(sizeof(struct scatterlist)*hwif->sg_max_nents,
1316                                 GFP_KERNEL);
1317        if (!hwif->sg_table) {
1318                printk(KERN_ERR "%s: unable to allocate SG table.\n", hwif->name);
1319                goto out;
1320        }
1321
1322        sg_init_table(hwif->sg_table, hwif->sg_max_nents);
1323        
1324        if (init_irq(hwif) == 0)
1325                goto done;
1326
1327        old_irq = hwif->irq;
1328        /*
1329         *      It failed to initialise. Find the default IRQ for 
1330         *      this port and try that.
1331         */
1332        if (!(hwif->irq = ide_default_irq(hwif->io_ports[IDE_DATA_OFFSET]))) {
1333                printk("%s: Disabled unable to get IRQ %d.\n",
1334                        hwif->name, old_irq);
1335                goto out;
1336        }
1337        if (init_irq(hwif)) {
1338                printk("%s: probed IRQ %d and default IRQ %d failed.\n",
1339                        hwif->name, old_irq, hwif->irq);
1340                goto out;
1341        }
1342        printk("%s: probed IRQ %d failed, using default.\n",
1343                hwif->name, hwif->irq);
1344
1345done:
1346        init_gendisk(hwif);
1347
1348        ide_acpi_init(hwif);
1349
1350        hwif->present = 1;      /* success */
1351        return 1;
1352
1353out:
1354        unregister_blkdev(hwif->major, hwif->name);
1355        return 0;
1356}
1357
1358static void hwif_register_devices(ide_hwif_t *hwif)
1359{
1360        unsigned int i;
1361
1362        for (i = 0; i < MAX_DRIVES; i++) {
1363                ide_drive_t *drive = &hwif->drives[i];
1364
1365                if (drive->present) {
1366                        int ret = device_register(&drive->gendev);
1367
1368                        if (ret < 0)
1369                                printk(KERN_WARNING "IDE: %s: "
1370                                        "device_register error: %d\n",
1371                                        __FUNCTION__, ret);
1372                }
1373        }
1374}
1375
1376int ideprobe_init (void)
1377{
1378        unsigned int index;
1379        int probe[MAX_HWIFS];
1380
1381        memset(probe, 0, MAX_HWIFS * sizeof(int));
1382        for (index = 0; index < MAX_HWIFS; ++index)
1383                probe[index] = !ide_hwifs[index].present;
1384
1385        for (index = 0; index < MAX_HWIFS; ++index)
1386                if (probe[index])
1387                        probe_hwif(&ide_hwifs[index]);
1388        for (index = 0; index < MAX_HWIFS; ++index)
1389                if (probe[index])
1390                        hwif_init(&ide_hwifs[index]);
1391        for (index = 0; index < MAX_HWIFS; ++index) {
1392                if (probe[index]) {
1393                        ide_hwif_t *hwif = &ide_hwifs[index];
1394                        if (!hwif->present)
1395                                continue;
1396                        if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
1397                                hwif->chipset = ide_generic;
1398                        hwif_register_devices(hwif);
1399                }
1400        }
1401        for (index = 0; index < MAX_HWIFS; ++index)
1402                if (probe[index])
1403                        ide_proc_register_port(&ide_hwifs[index]);
1404        return 0;
1405}
1406
1407EXPORT_SYMBOL_GPL(ideprobe_init);
1408
1409int ide_device_add(u8 idx[4])
1410{
1411        int i, rc = 0;
1412
1413        for (i = 0; i < 4; i++) {
1414                if (idx[i] != 0xff)
1415                        rc |= probe_hwif_init(&ide_hwifs[idx[i]]);
1416        }
1417
1418        for (i = 0; i < 4; i++) {
1419                if (idx[i] != 0xff)
1420                        ide_proc_register_port(&ide_hwifs[idx[i]]);
1421        }
1422
1423        return rc;
1424}
1425
1426EXPORT_SYMBOL_GPL(ide_device_add);
1427
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