linux/drivers/macintosh/mediabay.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Driver for the media bay on the PowerBook 3400 and 2400.
   4 *
   5 * Copyright (C) 1998 Paul Mackerras.
   6 *
   7 * Various evolutions by Benjamin Herrenschmidt & Henry Worth
   8 */
   9#include <linux/types.h>
  10#include <linux/errno.h>
  11#include <linux/kernel.h>
  12#include <linux/delay.h>
  13#include <linux/sched.h>
  14#include <linux/timer.h>
  15#include <linux/stddef.h>
  16#include <linux/init.h>
  17#include <linux/kthread.h>
  18#include <linux/mutex.h>
  19#include <linux/pgtable.h>
  20#include <asm/prom.h>
  21#include <asm/io.h>
  22#include <asm/machdep.h>
  23#include <asm/pmac_feature.h>
  24#include <asm/mediabay.h>
  25#include <asm/sections.h>
  26#include <asm/ohare.h>
  27#include <asm/heathrow.h>
  28#include <asm/keylargo.h>
  29#include <linux/adb.h>
  30#include <linux/pmu.h>
  31
  32#define MB_FCR32(bay, r)        ((bay)->base + ((r) >> 2))
  33#define MB_FCR8(bay, r)         (((volatile u8 __iomem *)((bay)->base)) + (r))
  34
  35#define MB_IN32(bay,r)          (in_le32(MB_FCR32(bay,r)))
  36#define MB_OUT32(bay,r,v)       (out_le32(MB_FCR32(bay,r), (v)))
  37#define MB_BIS(bay,r,v)         (MB_OUT32((bay), (r), MB_IN32((bay), r) | (v)))
  38#define MB_BIC(bay,r,v)         (MB_OUT32((bay), (r), MB_IN32((bay), r) & ~(v)))
  39#define MB_IN8(bay,r)           (in_8(MB_FCR8(bay,r)))
  40#define MB_OUT8(bay,r,v)        (out_8(MB_FCR8(bay,r), (v)))
  41
  42struct media_bay_info;
  43
  44struct mb_ops {
  45        char*   name;
  46        void    (*init)(struct media_bay_info *bay);
  47        u8      (*content)(struct media_bay_info *bay);
  48        void    (*power)(struct media_bay_info *bay, int on_off);
  49        int     (*setup_bus)(struct media_bay_info *bay, u8 device_id);
  50        void    (*un_reset)(struct media_bay_info *bay);
  51        void    (*un_reset_ide)(struct media_bay_info *bay);
  52};
  53
  54struct media_bay_info {
  55        u32 __iomem                     *base;
  56        int                             content_id;
  57        int                             state;
  58        int                             last_value;
  59        int                             value_count;
  60        int                             timer;
  61        struct macio_dev                *mdev;
  62        const struct mb_ops*            ops;
  63        int                             index;
  64        int                             cached_gpio;
  65        int                             sleeping;
  66        int                             user_lock;
  67        struct mutex                    lock;
  68};
  69
  70#define MAX_BAYS        2
  71
  72static struct media_bay_info media_bays[MAX_BAYS];
  73static int media_bay_count = 0;
  74
  75/*
  76 * Wait that number of ms between each step in normal polling mode
  77 */
  78#define MB_POLL_DELAY   25
  79
  80/*
  81 * Consider the media-bay ID value stable if it is the same for
  82 * this number of milliseconds
  83 */
  84#define MB_STABLE_DELAY 100
  85
  86/* Wait after powering up the media bay this delay in ms
  87 * timeout bumped for some powerbooks
  88 */
  89#define MB_POWER_DELAY  200
  90
  91/*
  92 * Hold the media-bay reset signal true for this many ticks
  93 * after a device is inserted before releasing it.
  94 */
  95#define MB_RESET_DELAY  50
  96
  97/*
  98 * Wait this long after the reset signal is released and before doing
  99 * further operations. After this delay, the IDE reset signal is released
 100 * too for an IDE device
 101 */
 102#define MB_SETUP_DELAY  100
 103
 104/*
 105 * Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted
 106 * (or until the device is ready) before calling into the driver
 107 */
 108#define MB_IDE_WAIT     1000
 109
 110/*
 111 * States of a media bay
 112 */
 113enum {
 114        mb_empty = 0,           /* Idle */
 115        mb_powering_up,         /* power bit set, waiting MB_POWER_DELAY */
 116        mb_enabling_bay,        /* enable bits set, waiting MB_RESET_DELAY */
 117        mb_resetting,           /* reset bit unset, waiting MB_SETUP_DELAY */
 118        mb_ide_resetting,       /* IDE reset bit unser, waiting MB_IDE_WAIT */
 119        mb_up,                  /* Media bay full */
 120        mb_powering_down        /* Powering down (avoid too fast down/up) */
 121};
 122
 123#define MB_POWER_SOUND          0x08
 124#define MB_POWER_FLOPPY         0x04
 125#define MB_POWER_ATA            0x02
 126#define MB_POWER_PCI            0x01
 127#define MB_POWER_OFF            0x00
 128
 129/*
 130 * Functions for polling content of media bay
 131 */
 132 
 133static u8
 134ohare_mb_content(struct media_bay_info *bay)
 135{
 136        return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
 137}
 138
 139static u8
 140heathrow_mb_content(struct media_bay_info *bay)
 141{
 142        return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
 143}
 144
 145static u8
 146keylargo_mb_content(struct media_bay_info *bay)
 147{
 148        int new_gpio;
 149
 150        new_gpio = MB_IN8(bay, KL_GPIO_MEDIABAY_IRQ) & KEYLARGO_GPIO_INPUT_DATA;
 151        if (new_gpio) {
 152                bay->cached_gpio = new_gpio;
 153                return MB_NO;
 154        } else if (bay->cached_gpio != new_gpio) {
 155                MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
 156                (void)MB_IN32(bay, KEYLARGO_MBCR);
 157                udelay(5);
 158                MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
 159                (void)MB_IN32(bay, KEYLARGO_MBCR);
 160                udelay(5);
 161                bay->cached_gpio = new_gpio;
 162        }
 163        return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7;
 164}
 165
 166/*
 167 * Functions for powering up/down the bay, puts the bay device
 168 * into reset state as well
 169 */
 170
 171static void
 172ohare_mb_power(struct media_bay_info* bay, int on_off)
 173{
 174        if (on_off) {
 175                /* Power up device, assert it's reset line */
 176                MB_BIC(bay, OHARE_FCR, OH_BAY_RESET_N);
 177                MB_BIC(bay, OHARE_FCR, OH_BAY_POWER_N);
 178        } else {
 179                /* Disable all devices */
 180                MB_BIC(bay, OHARE_FCR, OH_BAY_DEV_MASK);
 181                MB_BIC(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
 182                /* Cut power from bay, release reset line */
 183                MB_BIS(bay, OHARE_FCR, OH_BAY_POWER_N);
 184                MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
 185                MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
 186        }
 187        MB_BIC(bay, OHARE_MBCR, 0x00000F00);
 188}
 189
 190static void
 191heathrow_mb_power(struct media_bay_info* bay, int on_off)
 192{
 193        if (on_off) {
 194                /* Power up device, assert it's reset line */
 195                MB_BIC(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 196                MB_BIC(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
 197        } else {
 198                /* Disable all devices */
 199                MB_BIC(bay, HEATHROW_FCR, HRW_BAY_DEV_MASK);
 200                MB_BIC(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
 201                /* Cut power from bay, release reset line */
 202                MB_BIS(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
 203                MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 204                MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 205        }
 206        MB_BIC(bay, HEATHROW_MBCR, 0x00000F00);
 207}
 208
 209static void
 210keylargo_mb_power(struct media_bay_info* bay, int on_off)
 211{
 212        if (on_off) {
 213                /* Power up device, assert it's reset line */
 214                MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 215                MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
 216        } else {
 217                /* Disable all devices */
 218                MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_MASK);
 219                MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
 220                /* Cut power from bay, release reset line */
 221                MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
 222                MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 223                MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 224        }
 225        MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
 226}
 227
 228/*
 229 * Functions for configuring the media bay for a given type of device,
 230 * enable the related busses
 231 */
 232
 233static int
 234ohare_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 235{
 236        switch(device_id) {
 237                case MB_FD:
 238                case MB_FD1:
 239                        MB_BIS(bay, OHARE_FCR, OH_BAY_FLOPPY_ENABLE);
 240                        MB_BIS(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
 241                        return 0;
 242                case MB_CD:
 243                        MB_BIC(bay, OHARE_FCR, OH_IDE1_RESET_N);
 244                        MB_BIS(bay, OHARE_FCR, OH_BAY_IDE_ENABLE);
 245                        return 0;
 246                case MB_PCI:
 247                        MB_BIS(bay, OHARE_FCR, OH_BAY_PCI_ENABLE);
 248                        return 0;
 249        }
 250        return -ENODEV;
 251}
 252
 253static int
 254heathrow_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 255{
 256        switch(device_id) {
 257                case MB_FD:
 258                case MB_FD1:
 259                        MB_BIS(bay, HEATHROW_FCR, HRW_BAY_FLOPPY_ENABLE);
 260                        MB_BIS(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
 261                        return 0;
 262                case MB_CD:
 263                        MB_BIC(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 264                        MB_BIS(bay, HEATHROW_FCR, HRW_BAY_IDE_ENABLE);
 265                        return 0;
 266                case MB_PCI:
 267                        MB_BIS(bay, HEATHROW_FCR, HRW_BAY_PCI_ENABLE);
 268                        return 0;
 269        }
 270        return -ENODEV;
 271}
 272
 273static int
 274keylargo_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 275{
 276        switch(device_id) {
 277                case MB_CD:
 278                        MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_IDE_ENABLE);
 279                        MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 280                        MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
 281                        return 0;
 282                case MB_PCI:
 283                        MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_PCI_ENABLE);
 284                        return 0;
 285                case MB_SOUND:
 286                        MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_SOUND_ENABLE);
 287                        return 0;
 288        }
 289        return -ENODEV;
 290}
 291
 292/*
 293 * Functions for tweaking resets
 294 */
 295
 296static void
 297ohare_mb_un_reset(struct media_bay_info* bay)
 298{
 299        MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
 300}
 301
 302static void keylargo_mb_init(struct media_bay_info *bay)
 303{
 304        MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
 305}
 306
 307static void heathrow_mb_un_reset(struct media_bay_info* bay)
 308{
 309        MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 310}
 311
 312static void keylargo_mb_un_reset(struct media_bay_info* bay)
 313{
 314        MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 315}
 316
 317static void ohare_mb_un_reset_ide(struct media_bay_info* bay)
 318{
 319        MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
 320}
 321
 322static void heathrow_mb_un_reset_ide(struct media_bay_info* bay)
 323{
 324        MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 325}
 326
 327static void keylargo_mb_un_reset_ide(struct media_bay_info* bay)
 328{
 329        MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 330}
 331
 332static inline void set_mb_power(struct media_bay_info* bay, int onoff)
 333{
 334        /* Power up up and assert the bay reset line */
 335        if (onoff) {
 336                bay->ops->power(bay, 1);
 337                bay->state = mb_powering_up;
 338                pr_debug("mediabay%d: powering up\n", bay->index);
 339        } else { 
 340                /* Make sure everything is powered down & disabled */
 341                bay->ops->power(bay, 0);
 342                bay->state = mb_powering_down;
 343                pr_debug("mediabay%d: powering down\n", bay->index);
 344        }
 345        bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
 346}
 347
 348static void poll_media_bay(struct media_bay_info* bay)
 349{
 350        int id = bay->ops->content(bay);
 351
 352        static char *mb_content_types[] = {
 353                "a floppy drive",
 354                "a floppy drive",
 355                "an unsupported audio device",
 356                "an ATA device",
 357                "an unsupported PCI device",
 358                "an unknown device",
 359        };
 360
 361        if (id != bay->last_value) {
 362                bay->last_value = id;
 363                bay->value_count = 0;
 364                return;
 365        }
 366        if (id == bay->content_id)
 367                return;
 368
 369        bay->value_count += msecs_to_jiffies(MB_POLL_DELAY);
 370        if (bay->value_count >= msecs_to_jiffies(MB_STABLE_DELAY)) {
 371                /* If the device type changes without going thru
 372                 * "MB_NO", we force a pass by "MB_NO" to make sure
 373                 * things are properly reset
 374                 */
 375                if ((id != MB_NO) && (bay->content_id != MB_NO)) {
 376                        id = MB_NO;
 377                        pr_debug("mediabay%d: forcing MB_NO\n", bay->index);
 378                }
 379                pr_debug("mediabay%d: switching to %d\n", bay->index, id);
 380                set_mb_power(bay, id != MB_NO);
 381                bay->content_id = id;
 382                if (id >= MB_NO || id < 0)
 383                        printk(KERN_INFO "mediabay%d: Bay is now empty\n", bay->index);
 384                else
 385                        printk(KERN_INFO "mediabay%d: Bay contains %s\n",
 386                               bay->index, mb_content_types[id]);
 387        }
 388}
 389
 390int check_media_bay(struct macio_dev *baydev)
 391{
 392        struct media_bay_info* bay;
 393        int id;
 394
 395        if (baydev == NULL)
 396                return MB_NO;
 397
 398        /* This returns an instant snapshot, not locking, sine
 399         * we may be called with the bay lock held. The resulting
 400         * fuzzyness of the result if called at the wrong time is
 401         * not actually a huge deal
 402         */
 403        bay = macio_get_drvdata(baydev);
 404        if (bay == NULL)
 405                return MB_NO;
 406        id = bay->content_id;
 407        if (bay->state != mb_up)
 408                return MB_NO;
 409        if (id == MB_FD1)
 410                return MB_FD;
 411        return id;
 412}
 413EXPORT_SYMBOL_GPL(check_media_bay);
 414
 415void lock_media_bay(struct macio_dev *baydev)
 416{
 417        struct media_bay_info* bay;
 418
 419        if (baydev == NULL)
 420                return;
 421        bay = macio_get_drvdata(baydev);
 422        if (bay == NULL)
 423                return;
 424        mutex_lock(&bay->lock);
 425        bay->user_lock = 1;
 426}
 427EXPORT_SYMBOL_GPL(lock_media_bay);
 428
 429void unlock_media_bay(struct macio_dev *baydev)
 430{
 431        struct media_bay_info* bay;
 432
 433        if (baydev == NULL)
 434                return;
 435        bay = macio_get_drvdata(baydev);
 436        if (bay == NULL)
 437                return;
 438        if (bay->user_lock) {
 439                bay->user_lock = 0;
 440                mutex_unlock(&bay->lock);
 441        }
 442}
 443EXPORT_SYMBOL_GPL(unlock_media_bay);
 444
 445static int mb_broadcast_hotplug(struct device *dev, void *data)
 446{
 447        struct media_bay_info* bay = data;
 448        struct macio_dev *mdev;
 449        struct macio_driver *drv;
 450        int state;
 451
 452        if (dev->bus != &macio_bus_type)
 453                return 0;
 454
 455        state = bay->state == mb_up ? bay->content_id : MB_NO;
 456        if (state == MB_FD1)
 457                state = MB_FD;
 458        mdev = to_macio_device(dev);
 459        drv = to_macio_driver(dev->driver);
 460        if (dev->driver && drv->mediabay_event)
 461                drv->mediabay_event(mdev, state);
 462        return 0;
 463}
 464
 465static void media_bay_step(int i)
 466{
 467        struct media_bay_info* bay = &media_bays[i];
 468
 469        /* We don't poll when powering down */
 470        if (bay->state != mb_powering_down)
 471            poll_media_bay(bay);
 472
 473        /* If timer expired run state machine */
 474        if (bay->timer != 0) {
 475                bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
 476                if (bay->timer > 0)
 477                        return;
 478                bay->timer = 0;
 479        }
 480
 481        switch(bay->state) {
 482        case mb_powering_up:
 483                if (bay->ops->setup_bus(bay, bay->last_value) < 0) {
 484                        pr_debug("mediabay%d: device not supported (kind:%d)\n",
 485                                 i, bay->content_id);
 486                        set_mb_power(bay, 0);
 487                        break;
 488                }
 489                bay->timer = msecs_to_jiffies(MB_RESET_DELAY);
 490                bay->state = mb_enabling_bay;
 491                pr_debug("mediabay%d: enabling (kind:%d)\n", i, bay->content_id);
 492                break;
 493        case mb_enabling_bay:
 494                bay->ops->un_reset(bay);
 495                bay->timer = msecs_to_jiffies(MB_SETUP_DELAY);
 496                bay->state = mb_resetting;
 497                pr_debug("mediabay%d: releasing bay reset (kind:%d)\n",
 498                         i, bay->content_id);
 499                break;
 500        case mb_resetting:
 501                if (bay->content_id != MB_CD) {
 502                        pr_debug("mediabay%d: bay is up (kind:%d)\n", i,
 503                                 bay->content_id);
 504                        bay->state = mb_up;
 505                        device_for_each_child(&bay->mdev->ofdev.dev,
 506                                              bay, mb_broadcast_hotplug);
 507                        break;
 508                }
 509                pr_debug("mediabay%d: releasing ATA reset (kind:%d)\n",
 510                         i, bay->content_id);
 511                bay->ops->un_reset_ide(bay);
 512                bay->timer = msecs_to_jiffies(MB_IDE_WAIT);
 513                bay->state = mb_ide_resetting;
 514                break;
 515
 516        case mb_ide_resetting:
 517                pr_debug("mediabay%d: bay is up (kind:%d)\n", i, bay->content_id);
 518                bay->state = mb_up;
 519                device_for_each_child(&bay->mdev->ofdev.dev,
 520                                      bay, mb_broadcast_hotplug);
 521                break;
 522
 523        case mb_powering_down:
 524                bay->state = mb_empty;
 525                device_for_each_child(&bay->mdev->ofdev.dev,
 526                                      bay, mb_broadcast_hotplug);
 527                pr_debug("mediabay%d: end of power down\n", i);
 528                break;
 529        }
 530}
 531
 532/*
 533 * This procedure runs as a kernel thread to poll the media bay
 534 * once each tick and register and unregister the IDE interface
 535 * with the IDE driver.  It needs to be a thread because
 536 * ide_register can't be called from interrupt context.
 537 */
 538static int media_bay_task(void *x)
 539{
 540        int     i;
 541
 542        while (!kthread_should_stop()) {
 543                for (i = 0; i < media_bay_count; ++i) {
 544                        mutex_lock(&media_bays[i].lock);
 545                        if (!media_bays[i].sleeping)
 546                                media_bay_step(i);
 547                        mutex_unlock(&media_bays[i].lock);
 548                }
 549
 550                msleep_interruptible(MB_POLL_DELAY);
 551        }
 552        return 0;
 553}
 554
 555static int media_bay_attach(struct macio_dev *mdev,
 556                            const struct of_device_id *match)
 557{
 558        struct media_bay_info* bay;
 559        u32 __iomem *regbase;
 560        struct device_node *ofnode;
 561        unsigned long base;
 562        int i;
 563
 564        ofnode = mdev->ofdev.dev.of_node;
 565
 566        if (macio_resource_count(mdev) < 1)
 567                return -ENODEV;
 568        if (macio_request_resources(mdev, "media-bay"))
 569                return -EBUSY;
 570        /* Media bay registers are located at the beginning of the
 571         * mac-io chip, for now, we trick and align down the first
 572         * resource passed in
 573         */
 574        base = macio_resource_start(mdev, 0) & 0xffff0000u;
 575        regbase = (u32 __iomem *)ioremap(base, 0x100);
 576        if (regbase == NULL) {
 577                macio_release_resources(mdev);
 578                return -ENOMEM;
 579        }
 580        
 581        i = media_bay_count++;
 582        bay = &media_bays[i];
 583        bay->mdev = mdev;
 584        bay->base = regbase;
 585        bay->index = i;
 586        bay->ops = match->data;
 587        bay->sleeping = 0;
 588        mutex_init(&bay->lock);
 589
 590        /* Init HW probing */
 591        if (bay->ops->init)
 592                bay->ops->init(bay);
 593
 594        printk(KERN_INFO "mediabay%d: Registered %s media-bay\n", i, bay->ops->name);
 595
 596        /* Force an immediate detect */
 597        set_mb_power(bay, 0);
 598        msleep(MB_POWER_DELAY);
 599        bay->content_id = MB_NO;
 600        bay->last_value = bay->ops->content(bay);
 601        bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
 602        bay->state = mb_empty;
 603
 604        /* Mark us ready by filling our mdev data */
 605        macio_set_drvdata(mdev, bay);
 606
 607        /* Startup kernel thread */
 608        if (i == 0)
 609                kthread_run(media_bay_task, NULL, "media-bay");
 610
 611        return 0;
 612
 613}
 614
 615static int media_bay_suspend(struct macio_dev *mdev, pm_message_t state)
 616{
 617        struct media_bay_info   *bay = macio_get_drvdata(mdev);
 618
 619        if (state.event != mdev->ofdev.dev.power.power_state.event
 620            && (state.event & PM_EVENT_SLEEP)) {
 621                mutex_lock(&bay->lock);
 622                bay->sleeping = 1;
 623                set_mb_power(bay, 0);
 624                mutex_unlock(&bay->lock);
 625                msleep(MB_POLL_DELAY);
 626                mdev->ofdev.dev.power.power_state = state;
 627        }
 628        return 0;
 629}
 630
 631static int media_bay_resume(struct macio_dev *mdev)
 632{
 633        struct media_bay_info   *bay = macio_get_drvdata(mdev);
 634
 635        if (mdev->ofdev.dev.power.power_state.event != PM_EVENT_ON) {
 636                mdev->ofdev.dev.power.power_state = PMSG_ON;
 637
 638                /* We re-enable the bay using it's previous content
 639                   only if it did not change. Note those bozo timings,
 640                   they seem to help the 3400 get it right.
 641                 */
 642                /* Force MB power to 0 */
 643                mutex_lock(&bay->lock);
 644                set_mb_power(bay, 0);
 645                msleep(MB_POWER_DELAY);
 646                if (bay->ops->content(bay) != bay->content_id) {
 647                        printk("mediabay%d: Content changed during sleep...\n", bay->index);
 648                        mutex_unlock(&bay->lock);
 649                        return 0;
 650                }
 651                set_mb_power(bay, 1);
 652                bay->last_value = bay->content_id;
 653                bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
 654                bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
 655                do {
 656                        msleep(MB_POLL_DELAY);
 657                        media_bay_step(bay->index);
 658                } while((bay->state != mb_empty) &&
 659                        (bay->state != mb_up));
 660                bay->sleeping = 0;
 661                mutex_unlock(&bay->lock);
 662        }
 663        return 0;
 664}
 665
 666
 667/* Definitions of "ops" structures.
 668 */
 669static const struct mb_ops ohare_mb_ops = {
 670        .name           = "Ohare",
 671        .content        = ohare_mb_content,
 672        .power          = ohare_mb_power,
 673        .setup_bus      = ohare_mb_setup_bus,
 674        .un_reset       = ohare_mb_un_reset,
 675        .un_reset_ide   = ohare_mb_un_reset_ide,
 676};
 677
 678static const struct mb_ops heathrow_mb_ops = {
 679        .name           = "Heathrow",
 680        .content        = heathrow_mb_content,
 681        .power          = heathrow_mb_power,
 682        .setup_bus      = heathrow_mb_setup_bus,
 683        .un_reset       = heathrow_mb_un_reset,
 684        .un_reset_ide   = heathrow_mb_un_reset_ide,
 685};
 686
 687static const struct mb_ops keylargo_mb_ops = {
 688        .name           = "KeyLargo",
 689        .init           = keylargo_mb_init,
 690        .content        = keylargo_mb_content,
 691        .power          = keylargo_mb_power,
 692        .setup_bus      = keylargo_mb_setup_bus,
 693        .un_reset       = keylargo_mb_un_reset,
 694        .un_reset_ide   = keylargo_mb_un_reset_ide,
 695};
 696
 697/*
 698 * It seems that the bit for the media-bay interrupt in the IRQ_LEVEL
 699 * register is always set when there is something in the media bay.
 700 * This causes problems for the interrupt code if we attach an interrupt
 701 * handler to the media-bay interrupt, because it tends to go into
 702 * an infinite loop calling the media bay interrupt handler.
 703 * Therefore we do it all by polling the media bay once each tick.
 704 */
 705
 706static struct of_device_id media_bay_match[] =
 707{
 708        {
 709        .name           = "media-bay",
 710        .compatible     = "keylargo-media-bay",
 711        .data           = &keylargo_mb_ops,
 712        },
 713        {
 714        .name           = "media-bay",
 715        .compatible     = "heathrow-media-bay",
 716        .data           = &heathrow_mb_ops,
 717        },
 718        {
 719        .name           = "media-bay",
 720        .compatible     = "ohare-media-bay",
 721        .data           = &ohare_mb_ops,
 722        },
 723        {},
 724};
 725
 726static struct macio_driver media_bay_driver =
 727{
 728        .driver = {
 729                .name           = "media-bay",
 730                .of_match_table = media_bay_match,
 731        },
 732        .probe          = media_bay_attach,
 733        .suspend        = media_bay_suspend,
 734        .resume         = media_bay_resume
 735};
 736
 737static int __init media_bay_init(void)
 738{
 739        int i;
 740
 741        for (i=0; i<MAX_BAYS; i++) {
 742                memset((char *)&media_bays[i], 0, sizeof(struct media_bay_info));
 743                media_bays[i].content_id        = -1;
 744        }
 745        if (!machine_is(powermac))
 746                return 0;
 747
 748        macio_register_driver(&media_bay_driver);       
 749
 750        return 0;
 751}
 752
 753device_initcall(media_bay_init);
 754