drivers/macintosh/mediabay.c

   1 /*
   2  * Driver for the media bay on the PowerBook 3400 and 2400.
   3  *
   4  * Copyright (C) 1998 Paul Mackerras.
   5  *
   6  * Various evolutions by Benjamin Herrenschmidt & Henry Worth
   7  *
   8  *  This program is free software; you can redistribute it and/or
   9  *  modify it under the terms of the GNU General Public License
  10  *  as published by the Free Software Foundation; either version
  11  *  2 of the License, or (at your option) any later version.
  12  */
  13 #include <linux/types.h>
  14 #include <linux/errno.h>
  15 #include <linux/kernel.h>
  16 #include <linux/delay.h>
  17 #include <linux/sched.h>
  18 #include <linux/timer.h>
  19 #include <linux/stddef.h>
  20 #include <linux/init.h>
  21 #include <linux/kthread.h>
  22 #include <linux/mutex.h>
  23 #include <asm/prom.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/io.h>
  26 #include <asm/machdep.h>
  27 #include <asm/pmac_feature.h>
  28 #include <asm/mediabay.h>
  29 #include <asm/sections.h>
  30 #include <asm/ohare.h>
  31 #include <asm/heathrow.h>
  32 #include <asm/keylargo.h>
  33 #include <linux/adb.h>
  34 #include <linux/pmu.h>
  35
  36 #define MB_FCR32(bay, r)        ((bay)->base + ((r) >> 2))
  37 #define MB_FCR8(bay, r)         (((volatile u8 __iomem *)((bay)->base)) + (r))
  38
  39 #define MB_IN32(bay,r)          (in_le32(MB_FCR32(bay,r)))
  40 #define MB_OUT32(bay,r,v)       (out_le32(MB_FCR32(bay,r), (v)))
  41 #define MB_BIS(bay,r,v)         (MB_OUT32((bay), (r), MB_IN32((bay), r) | (v)))
  42 #define MB_BIC(bay,r,v)         (MB_OUT32((bay), (r), MB_IN32((bay), r) & ~(v)))
  43 #define MB_IN8(bay,r)           (in_8(MB_FCR8(bay,r)))
  44 #define MB_OUT8(bay,r,v)        (out_8(MB_FCR8(bay,r), (v)))
  45
  46 struct media_bay_info;
  47
  48 struct mb_ops {
  49         char*   name;
  50         void    (*init)(struct media_bay_info *bay);
  51         u8      (*content)(struct media_bay_info *bay);
  52         void    (*power)(struct media_bay_info *bay, int on_off);
  53         int     (*setup_bus)(struct media_bay_info *bay, u8 device_id);
  54         void    (*un_reset)(struct media_bay_info *bay);
  55         void    (*un_reset_ide)(struct media_bay_info *bay);
  56 };
  57
  58 struct media_bay_info {
  59         u32 __iomem                     *base;
  60         int                             content_id;
  61         int                             state;
  62         int                             last_value;
  63         int                             value_count;
  64         int                             timer;
  65         struct macio_dev                *mdev;
  66         struct mb_ops*                  ops;
  67         int                             index;
  68         int                             cached_gpio;
  69         int                             sleeping;
  70         int                             user_lock;
  71         struct mutex                    lock;
  72 };
  73
  74 #define MAX_BAYS        2
  75
  76 static struct media_bay_info media_bays[MAX_BAYS];
  77 static int media_bay_count = 0;
  78
  79 /*
  80  * Wait that number of ms between each step in normal polling mode
  81  */
  82 #define MB_POLL_DELAY   25
  83
  84 /*
  85  * Consider the media-bay ID value stable if it is the same for
  86  * this number of milliseconds
  87  */
  88 #define MB_STABLE_DELAY 100
  89
  90 /* Wait after powering up the media bay this delay in ms
  91  * timeout bumped for some powerbooks
  92  */
  93 #define MB_POWER_DELAY  200
  94
  95 /*
  96  * Hold the media-bay reset signal true for this many ticks
  97  * after a device is inserted before releasing it.
  98  */
  99 #define MB_RESET_DELAY  50
 100
 101 /*
 102  * Wait this long after the reset signal is released and before doing
 103  * further operations. After this delay, the IDE reset signal is released
 104  * too for an IDE device
 105  */
 106 #define MB_SETUP_DELAY  100
 107
 108 /*
 109  * Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted
 110  * (or until the device is ready) before calling into the driver
 111  */
 112 #define MB_IDE_WAIT     1000
 113
 114 /*
 115  * States of a media bay
 116  */
 117 enum {
 118         mb_empty = 0,           /* Idle */
 119         mb_powering_up,         /* power bit set, waiting MB_POWER_DELAY */
 120         mb_enabling_bay,        /* enable bits set, waiting MB_RESET_DELAY */
 121         mb_resetting,           /* reset bit unset, waiting MB_SETUP_DELAY */
 122         mb_ide_resetting,       /* IDE reset bit unser, waiting MB_IDE_WAIT */
 123         mb_up,                  /* Media bay full */
 124         mb_powering_down        /* Powering down (avoid too fast down/up) */
 125 };
 126
 127 #define MB_POWER_SOUND          0x08
 128 #define MB_POWER_FLOPPY         0x04
 129 #define MB_POWER_ATA            0x02
 130 #define MB_POWER_PCI            0x01
 131 #define MB_POWER_OFF            0x00
 132
 133 /*
 134  * Functions for polling content of media bay
 135  */
 136
 137 static u8
 138 ohare_mb_content(struct media_bay_info *bay)
 139 {
 140         return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
 141 }
 142
 143 static u8
 144 heathrow_mb_content(struct media_bay_info *bay)
 145 {
 146         return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
 147 }
 148
 149 static u8
 150 keylargo_mb_content(struct media_bay_info *bay)
 151 {
 152         int new_gpio;
 153
 154         new_gpio = MB_IN8(bay, KL_GPIO_MEDIABAY_IRQ) & KEYLARGO_GPIO_INPUT_DATA;
 155         if (new_gpio) {
 156                 bay->cached_gpio = new_gpio;
 157                 return MB_NO;
 158         } else if (bay->cached_gpio != new_gpio) {
 159                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
 160                 (void)MB_IN32(bay, KEYLARGO_MBCR);
 161                 udelay(5);
 162                 MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
 163                 (void)MB_IN32(bay, KEYLARGO_MBCR);
 164                 udelay(5);
 165                 bay->cached_gpio = new_gpio;
 166         }
 167         return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7;
 168 }
 169
 170 /*
 171  * Functions for powering up/down the bay, puts the bay device
 172  * into reset state as well
 173  */
 174
 175 static void
 176 ohare_mb_power(struct media_bay_info* bay, int on_off)
 177 {
 178         if (on_off) {
 179                 /* Power up device, assert it's reset line */
 180                 MB_BIC(bay, OHARE_FCR, OH_BAY_RESET_N);
 181                 MB_BIC(bay, OHARE_FCR, OH_BAY_POWER_N);
 182         } else {
 183                 /* Disable all devices */
 184                 MB_BIC(bay, OHARE_FCR, OH_BAY_DEV_MASK);
 185                 MB_BIC(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
 186                 /* Cut power from bay, release reset line */
 187                 MB_BIS(bay, OHARE_FCR, OH_BAY_POWER_N);
 188                 MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
 189                 MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
 190         }
 191         MB_BIC(bay, OHARE_MBCR, 0x00000F00);
 192 }
 193
 194 static void
 195 heathrow_mb_power(struct media_bay_info* bay, int on_off)
 196 {
 197         if (on_off) {
 198                 /* Power up device, assert it's reset line */
 199                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 200                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
 201         } else {
 202                 /* Disable all devices */
 203                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_DEV_MASK);
 204                 MB_BIC(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
 205                 /* Cut power from bay, release reset line */
 206                 MB_BIS(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
 207                 MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 208                 MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 209         }
 210         MB_BIC(bay, HEATHROW_MBCR, 0x00000F00);
 211 }
 212
 213 static void
 214 keylargo_mb_power(struct media_bay_info* bay, int on_off)
 215 {
 216         if (on_off) {
 217                 /* Power up device, assert it's reset line */
 218                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 219                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
 220         } else {
 221                 /* Disable all devices */
 222                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_MASK);
 223                 MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
 224                 /* Cut power from bay, release reset line */
 225                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
 226                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 227                 MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 228         }
 229         MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
 230 }
 231
 232 /*
 233  * Functions for configuring the media bay for a given type of device,
 234  * enable the related busses
 235  */
 236
 237 static int
 238 ohare_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 239 {
 240         switch(device_id) {
 241                 case MB_FD:
 242                 case MB_FD1:
 243                         MB_BIS(bay, OHARE_FCR, OH_BAY_FLOPPY_ENABLE);
 244                         MB_BIS(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
 245                         return 0;
 246                 case MB_CD:
 247                         MB_BIC(bay, OHARE_FCR, OH_IDE1_RESET_N);
 248                         MB_BIS(bay, OHARE_FCR, OH_BAY_IDE_ENABLE);
 249                         return 0;
 250                 case MB_PCI:
 251                         MB_BIS(bay, OHARE_FCR, OH_BAY_PCI_ENABLE);
 252                         return 0;
 253         }
 254         return -ENODEV;
 255 }
 256
 257 static int
 258 heathrow_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 259 {
 260         switch(device_id) {
 261                 case MB_FD:
 262                 case MB_FD1:
 263                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_FLOPPY_ENABLE);
 264                         MB_BIS(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
 265                         return 0;
 266                 case MB_CD:
 267                         MB_BIC(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 268                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_IDE_ENABLE);
 269                         return 0;
 270                 case MB_PCI:
 271                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_PCI_ENABLE);
 272                         return 0;
 273         }
 274         return -ENODEV;
 275 }
 276
 277 static int
 278 keylargo_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 279 {
 280         switch(device_id) {
 281                 case MB_CD:
 282                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_IDE_ENABLE);
 283                         MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 284                         MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
 285                         return 0;
 286                 case MB_PCI:
 287                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_PCI_ENABLE);
 288                         return 0;
 289                 case MB_SOUND:
 290                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_SOUND_ENABLE);
 291                         return 0;
 292         }
 293         return -ENODEV;
 294 }
 295
 296 /*
 297  * Functions for tweaking resets
 298  */
 299
 300 static void
 301 ohare_mb_un_reset(struct media_bay_info* bay)
 302 {
 303         MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
 304 }
 305
 306 static void keylargo_mb_init(struct media_bay_info *bay)
 307 {
 308         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
 309 }
 310
 311 static void heathrow_mb_un_reset(struct media_bay_info* bay)
 312 {
 313         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 314 }
 315
 316 static void keylargo_mb_un_reset(struct media_bay_info* bay)
 317 {
 318         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 319 }
 320
 321 static void ohare_mb_un_reset_ide(struct media_bay_info* bay)
 322 {
 323         MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
 324 }
 325
 326 static void heathrow_mb_un_reset_ide(struct media_bay_info* bay)
 327 {
 328         MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 329 }
 330
 331 static void keylargo_mb_un_reset_ide(struct media_bay_info* bay)
 332 {
 333         MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 334 }
 335
 336 static inline void set_mb_power(struct media_bay_info* bay, int onoff)
 337 {
 338         /* Power up up and assert the bay reset line */
 339         if (onoff) {
 340                 bay->ops->power(bay, 1);
 341                 bay->state = mb_powering_up;
 342                 pr_debug("mediabay%d: powering up\n", bay->index);
 343         } else {
 344                 /* Make sure everything is powered down & disabled */
 345                 bay->ops->power(bay, 0);
 346                 bay->state = mb_powering_down;
 347                 pr_debug("mediabay%d: powering down\n", bay->index);
 348         }
 349         bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
 350 }
 351
 352 static void poll_media_bay(struct media_bay_info* bay)
 353 {
 354         int id = bay->ops->content(bay);
 355
 356         static char *mb_content_types[] = {
 357                 "a floppy drive",
 358                 "a floppy drive",
 359                 "an unsuported audio device",
 360                 "an ATA device",
 361                 "an unsupported PCI device",
 362                 "an unknown device",
 363         };
 364
 365         if (id != bay->last_value) {
 366                 bay->last_value = id;
 367                 bay->value_count = 0;
 368                 return;
 369         }
 370         if (id == bay->content_id)
 371                 return;
 372
 373         bay->value_count += msecs_to_jiffies(MB_POLL_DELAY);
 374         if (bay->value_count >= msecs_to_jiffies(MB_STABLE_DELAY)) {
 375                 /* If the device type changes without going thru
 376                  * "MB_NO", we force a pass by "MB_NO" to make sure
 377                  * things are properly reset
 378                  */
 379                 if ((id != MB_NO) && (bay->content_id != MB_NO)) {
 380                         id = MB_NO;
 381                         pr_debug("mediabay%d: forcing MB_NO\n", bay->index);
 382                 }
 383                 pr_debug("mediabay%d: switching to %d\n", bay->index, id);
 384                 set_mb_power(bay, id != MB_NO);
 385                 bay->content_id = id;
 386                 if (id >= MB_NO || id < 0)
 387                         printk(KERN_INFO "mediabay%d: Bay is now empty\n", bay->index);
 388                 else
 389                         printk(KERN_INFO "mediabay%d: Bay contains %s\n",
 390                                bay->index, mb_content_types[id]);
 391         }
 392 }
 393
 394 int check_media_bay(struct macio_dev *baydev)
 395 {
 396         struct media_bay_info* bay;
 397         int id;
 398
 399         if (baydev == NULL)
 400                 return MB_NO;
 401
 402         /* This returns an instant snapshot, not locking, sine
 403          * we may be called with the bay lock held. The resulting
 404          * fuzzyness of the result if called at the wrong time is
 405          * not actually a huge deal
 406          */
 407         bay = macio_get_drvdata(baydev);
 408         if (bay == NULL)
 409                 return MB_NO;
 410         id = bay->content_id;
 411         if (bay->state != mb_up)
 412                 return MB_NO;
 413         if (id == MB_FD1)
 414                 return MB_FD;
 415         return id;
 416 }
 417 EXPORT_SYMBOL_GPL(check_media_bay);
 418
 419 void lock_media_bay(struct macio_dev *baydev)
 420 {
 421         struct media_bay_info* bay;
 422
 423         if (baydev == NULL)
 424                 return;
 425         bay = macio_get_drvdata(baydev);
 426         if (bay == NULL)
 427                 return;
 428         mutex_lock(&bay->lock);
 429         bay->user_lock = 1;
 430 }
 431 EXPORT_SYMBOL_GPL(lock_media_bay);
 432
 433 void unlock_media_bay(struct macio_dev *baydev)
 434 {
 435         struct media_bay_info* bay;
 436
 437         if (baydev == NULL)
 438                 return;
 439         bay = macio_get_drvdata(baydev);
 440         if (bay == NULL)
 441                 return;
 442         if (bay->user_lock) {
 443                 bay->user_lock = 0;
 444                 mutex_unlock(&bay->lock);
 445         }
 446 }
 447 EXPORT_SYMBOL_GPL(unlock_media_bay);
 448
 449 static int mb_broadcast_hotplug(struct device *dev, void *data)
 450 {
 451         struct media_bay_info* bay = data;
 452         struct macio_dev *mdev;
 453         struct macio_driver *drv;
 454         int state;
 455
 456         if (dev->bus != &macio_bus_type)
 457                 return 0;
 458
 459         state = bay->state == mb_up ? bay->content_id : MB_NO;
 460         if (state == MB_FD1)
 461                 state = MB_FD;
 462         mdev = to_macio_device(dev);
 463         drv = to_macio_driver(dev->driver);
 464         if (dev->driver && drv->mediabay_event)
 465                 drv->mediabay_event(mdev, state);
 466         return 0;
 467 }
 468
 469 static void media_bay_step(int i)
 470 {
 471         struct media_bay_info* bay = &media_bays[i];
 472
 473         /* We don't poll when powering down */
 474         if (bay->state != mb_powering_down)
 475             poll_media_bay(bay);
 476
 477         /* If timer expired run state machine */
 478         if (bay->timer != 0) {
 479                 bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
 480                 if (bay->timer > 0)
 481                         return;
 482                 bay->timer = 0;
 483         }
 484
 485         switch(bay->state) {
 486         case mb_powering_up:
 487                 if (bay->ops->setup_bus(bay, bay->last_value) < 0) {
 488                         pr_debug("mediabay%d: device not supported (kind:%d)\n",
 489                                  i, bay->content_id);
 490                         set_mb_power(bay, 0);
 491                         break;
 492                 }
 493                 bay->timer = msecs_to_jiffies(MB_RESET_DELAY);
 494                 bay->state = mb_enabling_bay;
 495                 pr_debug("mediabay%d: enabling (kind:%d)\n", i, bay->content_id);
 496                 break;
 497         case mb_enabling_bay:
 498                 bay->ops->un_reset(bay);
 499                 bay->timer = msecs_to_jiffies(MB_SETUP_DELAY);
 500                 bay->state = mb_resetting;
 501                 pr_debug("mediabay%d: releasing bay reset (kind:%d)\n",
 502                          i, bay->content_id);
 503                 break;
 504         case mb_resetting:
 505                 if (bay->content_id != MB_CD) {
 506                         pr_debug("mediabay%d: bay is up (kind:%d)\n", i,
 507                                  bay->content_id);
 508                         bay->state = mb_up;
 509                         device_for_each_child(&bay->mdev->ofdev.dev,
 510                                               bay, mb_broadcast_hotplug);
 511                         break;
 512                 }
 513                 pr_debug("mediabay%d: releasing ATA reset (kind:%d)\n",
 514                          i, bay->content_id);
 515                 bay->ops->un_reset_ide(bay);
 516                 bay->timer = msecs_to_jiffies(MB_IDE_WAIT);
 517                 bay->state = mb_ide_resetting;
 518                 break;
 519
 520         case mb_ide_resetting:
 521                 pr_debug("mediabay%d: bay is up (kind:%d)\n", i, bay->content_id);
 522                 bay->state = mb_up;
 523                 device_for_each_child(&bay->mdev->ofdev.dev,
 524                                       bay, mb_broadcast_hotplug);
 525                 break;
 526
 527         case mb_powering_down:
 528                 bay->state = mb_empty;
 529                 device_for_each_child(&bay->mdev->ofdev.dev,
 530                                       bay, mb_broadcast_hotplug);
 531                 pr_debug("mediabay%d: end of power down\n", i);
 532                 break;
 533         }
 534 }
 535
 536 /*
 537  * This procedure runs as a kernel thread to poll the media bay
 538  * once each tick and register and unregister the IDE interface
 539  * with the IDE driver.  It needs to be a thread because
 540  * ide_register can't be called from interrupt context.
 541  */
 542 static int media_bay_task(void *x)
 543 {
 544         int     i;
 545
 546         while (!kthread_should_stop()) {
 547                 for (i = 0; i < media_bay_count; ++i) {
 548                         mutex_lock(&media_bays[i].lock);
 549                         if (!media_bays[i].sleeping)
 550                                 media_bay_step(i);
 551                         mutex_unlock(&media_bays[i].lock);
 552                 }
 553
 554                 msleep_interruptible(MB_POLL_DELAY);
 555         }
 556         return 0;
 557 }
 558
 559 static int __devinit media_bay_attach(struct macio_dev *mdev, const struct of_device_id *match)
 560 {
 561         struct media_bay_info* bay;
 562         u32 __iomem *regbase;
 563         struct device_node *ofnode;
 564         unsigned long base;
 565         int i;
 566
 567         ofnode = mdev->ofdev.dev.of_node;
 568
 569         if (macio_resource_count(mdev) < 1)
 570                 return -ENODEV;
 571         if (macio_request_resources(mdev, "media-bay"))
 572                 return -EBUSY;
 573         /* Media bay registers are located at the beginning of the
 574          * mac-io chip, for now, we trick and align down the first
 575          * resource passed in
 576          */
 577         base = macio_resource_start(mdev, 0) & 0xffff0000u;
 578         regbase = (u32 __iomem *)ioremap(base, 0x100);
 579         if (regbase == NULL) {
 580                 macio_release_resources(mdev);
 581                 return -ENOMEM;
 582         }
 583
 584         i = media_bay_count++;
 585         bay = &media_bays[i];
 586         bay->mdev = mdev;
 587         bay->base = regbase;
 588         bay->index = i;
 589         bay->ops = match->data;
 590         bay->sleeping = 0;
 591         mutex_init(&bay->lock);
 592
 593         /* Init HW probing */
 594         if (bay->ops->init)
 595                 bay->ops->init(bay);
 596
 597         printk(KERN_INFO "mediabay%d: Registered %s media-bay\n", i, bay->ops->name);
 598
 599         /* Force an immediate detect */
 600         set_mb_power(bay, 0);
 601         msleep(MB_POWER_DELAY);
 602         bay->content_id = MB_NO;
 603         bay->last_value = bay->ops->content(bay);
 604         bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
 605         bay->state = mb_empty;
 606
 607         /* Mark us ready by filling our mdev data */
 608         macio_set_drvdata(mdev, bay);
 609
 610         /* Startup kernel thread */
 611         if (i == 0)
 612                 kthread_run(media_bay_task, NULL, "media-bay");
 613
 614         return 0;
 615
 616 }
 617
 618 static int media_bay_suspend(struct macio_dev *mdev, pm_message_t state)
 619 {
 620         struct media_bay_info   *bay = macio_get_drvdata(mdev);
 621
 622         if (state.event != mdev->ofdev.dev.power.power_state.event
 623             && (state.event & PM_EVENT_SLEEP)) {
 624                 mutex_lock(&bay->lock);
 625                 bay->sleeping = 1;
 626                 set_mb_power(bay, 0);
 627                 mutex_unlock(&bay->lock);
 628                 msleep(MB_POLL_DELAY);
 629                 mdev->ofdev.dev.power.power_state = state;
 630         }
 631         return 0;
 632 }
 633
 634 static int media_bay_resume(struct macio_dev *mdev)
 635 {
 636         struct media_bay_info   *bay = macio_get_drvdata(mdev);
 637
 638         if (mdev->ofdev.dev.power.power_state.event != PM_EVENT_ON) {
 639                 mdev->ofdev.dev.power.power_state = PMSG_ON;
 640
 641                 /* We re-enable the bay using it's previous content
 642                    only if it did not change. Note those bozo timings,
 643                    they seem to help the 3400 get it right.
 644                  */
 645                 /* Force MB power to 0 */
 646                 mutex_lock(&bay->lock);
 647                 set_mb_power(bay, 0);
 648                 msleep(MB_POWER_DELAY);
 649                 if (bay->ops->content(bay) != bay->content_id) {
 650                         printk("mediabay%d: Content changed during sleep...\n", bay->index);
 651                         mutex_unlock(&bay->lock);
 652                         return 0;
 653                 }
 654                 set_mb_power(bay, 1);
 655                 bay->last_value = bay->content_id;
 656                 bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
 657                 bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
 658                 do {
 659                         msleep(MB_POLL_DELAY);
 660                         media_bay_step(bay->index);
 661                 } while((bay->state != mb_empty) &&
 662                         (bay->state != mb_up));
 663                 bay->sleeping = 0;
 664                 mutex_unlock(&bay->lock);
 665         }
 666         return 0;
 667 }
 668
 669
 670 /* Definitions of "ops" structures.
 671  */
 672 static struct mb_ops ohare_mb_ops = {
 673         .name           = "Ohare",
 674         .content        = ohare_mb_content,
 675         .power          = ohare_mb_power,
 676         .setup_bus      = ohare_mb_setup_bus,
 677         .un_reset       = ohare_mb_un_reset,
 678         .un_reset_ide   = ohare_mb_un_reset_ide,
 679 };
 680
 681 static struct mb_ops heathrow_mb_ops = {
 682         .name           = "Heathrow",
 683         .content        = heathrow_mb_content,
 684         .power          = heathrow_mb_power,
 685         .setup_bus      = heathrow_mb_setup_bus,
 686         .un_reset       = heathrow_mb_un_reset,
 687         .un_reset_ide   = heathrow_mb_un_reset_ide,
 688 };
 689
 690 static struct mb_ops keylargo_mb_ops = {
 691         .name           = "KeyLargo",
 692         .init           = keylargo_mb_init,
 693         .content        = keylargo_mb_content,
 694         .power          = keylargo_mb_power,
 695         .setup_bus      = keylargo_mb_setup_bus,
 696         .un_reset       = keylargo_mb_un_reset,
 697         .un_reset_ide   = keylargo_mb_un_reset_ide,
 698 };
 699
 700 /*
 701  * It seems that the bit for the media-bay interrupt in the IRQ_LEVEL
 702  * register is always set when there is something in the media bay.
 703  * This causes problems for the interrupt code if we attach an interrupt
 704  * handler to the media-bay interrupt, because it tends to go into
 705  * an infinite loop calling the media bay interrupt handler.
 706  * Therefore we do it all by polling the media bay once each tick.
 707  */
 708
 709 static struct of_device_id media_bay_match[] =
 710 {
 711         {
 712         .name           = "media-bay",
 713         .compatible     = "keylargo-media-bay",
 714         .data           = &keylargo_mb_ops,
 715         },
 716         {
 717         .name           = "media-bay",
 718         .compatible     = "heathrow-media-bay",
 719         .data           = &heathrow_mb_ops,
 720         },
 721         {
 722         .name           = "media-bay",
 723         .compatible     = "ohare-media-bay",
 724         .data           = &ohare_mb_ops,
 725         },
 726         {},
 727 };
 728
 729 static struct macio_driver media_bay_driver =
 730 {
 731         .driver = {
 732                 .name           = "media-bay",
 733                 .of_match_table = media_bay_match,
 734         },
 735         .probe          = media_bay_attach,
 736         .suspend        = media_bay_suspend,
 737         .resume         = media_bay_resume
 738 };
 739
 740 static int __init media_bay_init(void)
 741 {
 742         int i;
 743
 744         for (i=0; i<MAX_BAYS; i++) {
 745                 memset((char *)&media_bays[i], 0, sizeof(struct media_bay_info));
 746                 media_bays[i].content_id        = -1;
 747         }
 748         if (!machine_is(powermac))
 749                 return 0;
 750
 751         macio_register_driver(&media_bay_driver);
 752
 753         return 0;
 754 }
 755
 756 device_initcall(media_bay_init);