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/hdreg.h>
  20 #include <linux/stddef.h>
  21 #include <linux/init.h>
  22 #include <linux/ide.h>
  23 #include <linux/kthread.h>
  24 #include <asm/prom.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/io.h>
  27 #include <asm/machdep.h>
  28 #include <asm/pmac_feature.h>
  29 #include <asm/mediabay.h>
  30 #include <asm/sections.h>
  31 #include <asm/ohare.h>
  32 #include <asm/heathrow.h>
  33 #include <asm/keylargo.h>
  34 #include <linux/adb.h>
  35 #include <linux/pmu.h>
  36
  37
  38 #define MB_DEBUG
  39
  40 #ifdef MB_DEBUG
  41 #define MBDBG(fmt, arg...)      printk(KERN_INFO fmt , ## arg)
  42 #else
  43 #define MBDBG(fmt, arg...)      do { } while (0)
  44 #endif
  45
  46 #define MB_FCR32(bay, r)        ((bay)->base + ((r) >> 2))
  47 #define MB_FCR8(bay, r)         (((volatile u8 __iomem *)((bay)->base)) + (r))
  48
  49 #define MB_IN32(bay,r)          (in_le32(MB_FCR32(bay,r)))
  50 #define MB_OUT32(bay,r,v)       (out_le32(MB_FCR32(bay,r), (v)))
  51 #define MB_BIS(bay,r,v)         (MB_OUT32((bay), (r), MB_IN32((bay), r) | (v)))
  52 #define MB_BIC(bay,r,v)         (MB_OUT32((bay), (r), MB_IN32((bay), r) & ~(v)))
  53 #define MB_IN8(bay,r)           (in_8(MB_FCR8(bay,r)))
  54 #define MB_OUT8(bay,r,v)        (out_8(MB_FCR8(bay,r), (v)))
  55
  56 struct media_bay_info;
  57
  58 struct mb_ops {
  59         char*   name;
  60         void    (*init)(struct media_bay_info *bay);
  61         u8      (*content)(struct media_bay_info *bay);
  62         void    (*power)(struct media_bay_info *bay, int on_off);
  63         int     (*setup_bus)(struct media_bay_info *bay, u8 device_id);
  64         void    (*un_reset)(struct media_bay_info *bay);
  65         void    (*un_reset_ide)(struct media_bay_info *bay);
  66 };
  67
  68 struct media_bay_info {
  69         u32 __iomem                     *base;
  70         int                             content_id;
  71         int                             state;
  72         int                             last_value;
  73         int                             value_count;
  74         int                             timer;
  75         struct macio_dev                *mdev;
  76         struct mb_ops*                  ops;
  77         int                             index;
  78         int                             cached_gpio;
  79         int                             sleeping;
  80         struct semaphore                lock;
  81 #ifdef CONFIG_BLK_DEV_IDE_PMAC
  82         ide_hwif_t                      *cd_port;
  83         void __iomem                    *cd_base;
  84         int                             cd_irq;
  85         int                             cd_retry;
  86 #endif
  87 #if defined(CONFIG_BLK_DEV_IDE_PMAC) || defined(CONFIG_MAC_FLOPPY)
  88         int                             cd_index;
  89 #endif
  90 };
  91
  92 #define MAX_BAYS        2
  93
  94 static struct media_bay_info media_bays[MAX_BAYS];
  95 int media_bay_count = 0;
  96
  97 #ifdef CONFIG_BLK_DEV_IDE_PMAC
  98 /* check the busy bit in the media-bay ide interface
  99    (assumes the media-bay contains an ide device) */
 100 #define MB_IDE_READY(i) ((readb(media_bays[i].cd_base + 0x70) & 0x80) == 0)
 101 #endif
 102
 103 /*
 104  * Wait that number of ms between each step in normal polling mode
 105  */
 106 #define MB_POLL_DELAY   25
 107
 108 /*
 109  * Consider the media-bay ID value stable if it is the same for
 110  * this number of milliseconds
 111  */
 112 #define MB_STABLE_DELAY 100
 113
 114 /* Wait after powering up the media bay this delay in ms
 115  * timeout bumped for some powerbooks
 116  */
 117 #define MB_POWER_DELAY  200
 118
 119 /*
 120  * Hold the media-bay reset signal true for this many ticks
 121  * after a device is inserted before releasing it.
 122  */
 123 #define MB_RESET_DELAY  50
 124
 125 /*
 126  * Wait this long after the reset signal is released and before doing
 127  * further operations. After this delay, the IDE reset signal is released
 128  * too for an IDE device
 129  */
 130 #define MB_SETUP_DELAY  100
 131
 132 /*
 133  * Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted
 134  * (or until the device is ready) before waiting for busy bit to disappear
 135  */
 136 #define MB_IDE_WAIT     1000
 137
 138 /*
 139  * Timeout waiting for busy bit of an IDE device to go down
 140  */
 141 #define MB_IDE_TIMEOUT  5000
 142
 143 /*
 144  * Max retries of the full power up/down sequence for an IDE device
 145  */
 146 #define MAX_CD_RETRIES  3
 147
 148 /*
 149  * States of a media bay
 150  */
 151 enum {
 152         mb_empty = 0,           /* Idle */
 153         mb_powering_up,         /* power bit set, waiting MB_POWER_DELAY */
 154         mb_enabling_bay,        /* enable bits set, waiting MB_RESET_DELAY */
 155         mb_resetting,           /* reset bit unset, waiting MB_SETUP_DELAY */
 156         mb_ide_resetting,       /* IDE reset bit unser, waiting MB_IDE_WAIT */
 157         mb_ide_waiting,         /* Waiting for BUSY bit to go away until MB_IDE_TIMEOUT */
 158         mb_up,                  /* Media bay full */
 159         mb_powering_down        /* Powering down (avoid too fast down/up) */
 160 };
 161
 162 #define MB_POWER_SOUND          0x08
 163 #define MB_POWER_FLOPPY         0x04
 164 #define MB_POWER_ATA            0x02
 165 #define MB_POWER_PCI            0x01
 166 #define MB_POWER_OFF            0x00
 167
 168 /*
 169  * Functions for polling content of media bay
 170  */
 171
 172 static u8
 173 ohare_mb_content(struct media_bay_info *bay)
 174 {
 175         return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
 176 }
 177
 178 static u8
 179 heathrow_mb_content(struct media_bay_info *bay)
 180 {
 181         return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
 182 }
 183
 184 static u8
 185 keylargo_mb_content(struct media_bay_info *bay)
 186 {
 187         int new_gpio;
 188
 189         new_gpio = MB_IN8(bay, KL_GPIO_MEDIABAY_IRQ) & KEYLARGO_GPIO_INPUT_DATA;
 190         if (new_gpio) {
 191                 bay->cached_gpio = new_gpio;
 192                 return MB_NO;
 193         } else if (bay->cached_gpio != new_gpio) {
 194                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
 195                 (void)MB_IN32(bay, KEYLARGO_MBCR);
 196                 udelay(5);
 197                 MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
 198                 (void)MB_IN32(bay, KEYLARGO_MBCR);
 199                 udelay(5);
 200                 bay->cached_gpio = new_gpio;
 201         }
 202         return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7;
 203 }
 204
 205 /*
 206  * Functions for powering up/down the bay, puts the bay device
 207  * into reset state as well
 208  */
 209
 210 static void
 211 ohare_mb_power(struct media_bay_info* bay, int on_off)
 212 {
 213         if (on_off) {
 214                 /* Power up device, assert it's reset line */
 215                 MB_BIC(bay, OHARE_FCR, OH_BAY_RESET_N);
 216                 MB_BIC(bay, OHARE_FCR, OH_BAY_POWER_N);
 217         } else {
 218                 /* Disable all devices */
 219                 MB_BIC(bay, OHARE_FCR, OH_BAY_DEV_MASK);
 220                 MB_BIC(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
 221                 /* Cut power from bay, release reset line */
 222                 MB_BIS(bay, OHARE_FCR, OH_BAY_POWER_N);
 223                 MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
 224                 MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
 225         }
 226         MB_BIC(bay, OHARE_MBCR, 0x00000F00);
 227 }
 228
 229 static void
 230 heathrow_mb_power(struct media_bay_info* bay, int on_off)
 231 {
 232         if (on_off) {
 233                 /* Power up device, assert it's reset line */
 234                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 235                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
 236         } else {
 237                 /* Disable all devices */
 238                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_DEV_MASK);
 239                 MB_BIC(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
 240                 /* Cut power from bay, release reset line */
 241                 MB_BIS(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
 242                 MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 243                 MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 244         }
 245         MB_BIC(bay, HEATHROW_MBCR, 0x00000F00);
 246 }
 247
 248 static void
 249 keylargo_mb_power(struct media_bay_info* bay, int on_off)
 250 {
 251         if (on_off) {
 252                 /* Power up device, assert it's reset line */
 253                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 254                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
 255         } else {
 256                 /* Disable all devices */
 257                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_MASK);
 258                 MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
 259                 /* Cut power from bay, release reset line */
 260                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
 261                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 262                 MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 263         }
 264         MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
 265 }
 266
 267 /*
 268  * Functions for configuring the media bay for a given type of device,
 269  * enable the related busses
 270  */
 271
 272 static int
 273 ohare_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 274 {
 275         switch(device_id) {
 276                 case MB_FD:
 277                 case MB_FD1:
 278                         MB_BIS(bay, OHARE_FCR, OH_BAY_FLOPPY_ENABLE);
 279                         MB_BIS(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
 280                         return 0;
 281                 case MB_CD:
 282                         MB_BIC(bay, OHARE_FCR, OH_IDE1_RESET_N);
 283                         MB_BIS(bay, OHARE_FCR, OH_BAY_IDE_ENABLE);
 284                         return 0;
 285                 case MB_PCI:
 286                         MB_BIS(bay, OHARE_FCR, OH_BAY_PCI_ENABLE);
 287                         return 0;
 288         }
 289         return -ENODEV;
 290 }
 291
 292 static int
 293 heathrow_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 294 {
 295         switch(device_id) {
 296                 case MB_FD:
 297                 case MB_FD1:
 298                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_FLOPPY_ENABLE);
 299                         MB_BIS(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
 300                         return 0;
 301                 case MB_CD:
 302                         MB_BIC(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 303                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_IDE_ENABLE);
 304                         return 0;
 305                 case MB_PCI:
 306                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_PCI_ENABLE);
 307                         return 0;
 308         }
 309         return -ENODEV;
 310 }
 311
 312 static int
 313 keylargo_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 314 {
 315         switch(device_id) {
 316                 case MB_CD:
 317                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_IDE_ENABLE);
 318                         MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 319                         MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
 320                         return 0;
 321                 case MB_PCI:
 322                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_PCI_ENABLE);
 323                         return 0;
 324                 case MB_SOUND:
 325                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_SOUND_ENABLE);
 326                         return 0;
 327         }
 328         return -ENODEV;
 329 }
 330
 331 /*
 332  * Functions for tweaking resets
 333  */
 334
 335 static void
 336 ohare_mb_un_reset(struct media_bay_info* bay)
 337 {
 338         MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
 339 }
 340
 341 static void keylargo_mb_init(struct media_bay_info *bay)
 342 {
 343         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
 344 }
 345
 346 static void heathrow_mb_un_reset(struct media_bay_info* bay)
 347 {
 348         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 349 }
 350
 351 static void keylargo_mb_un_reset(struct media_bay_info* bay)
 352 {
 353         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 354 }
 355
 356 static void ohare_mb_un_reset_ide(struct media_bay_info* bay)
 357 {
 358         MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
 359 }
 360
 361 static void heathrow_mb_un_reset_ide(struct media_bay_info* bay)
 362 {
 363         MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 364 }
 365
 366 static void keylargo_mb_un_reset_ide(struct media_bay_info* bay)
 367 {
 368         MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 369 }
 370
 371 static inline void set_mb_power(struct media_bay_info* bay, int onoff)
 372 {
 373         /* Power up up and assert the bay reset line */
 374         if (onoff) {
 375                 bay->ops->power(bay, 1);
 376                 bay->state = mb_powering_up;
 377                 MBDBG("mediabay%d: powering up\n", bay->index);
 378         } else {
 379                 /* Make sure everything is powered down & disabled */
 380                 bay->ops->power(bay, 0);
 381                 bay->state = mb_powering_down;
 382                 MBDBG("mediabay%d: powering down\n", bay->index);
 383         }
 384         bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
 385 }
 386
 387 static void poll_media_bay(struct media_bay_info* bay)
 388 {
 389         int id = bay->ops->content(bay);
 390
 391         if (id == bay->last_value) {
 392                 if (id != bay->content_id) {
 393                         bay->value_count += msecs_to_jiffies(MB_POLL_DELAY);
 394                         if (bay->value_count >= msecs_to_jiffies(MB_STABLE_DELAY)) {
 395                                 /* If the device type changes without going thru
 396                                  * "MB_NO", we force a pass by "MB_NO" to make sure
 397                                  * things are properly reset
 398                                  */
 399                                 if ((id != MB_NO) && (bay->content_id != MB_NO)) {
 400                                         id = MB_NO;
 401                                         MBDBG("mediabay%d: forcing MB_NO\n", bay->index);
 402                                 }
 403                                 MBDBG("mediabay%d: switching to %d\n", bay->index, id);
 404                                 set_mb_power(bay, id != MB_NO);
 405                                 bay->content_id = id;
 406                                 if (id == MB_NO) {
 407 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 408                                         bay->cd_retry = 0;
 409 #endif
 410                                         printk(KERN_INFO "media bay %d is empty\n", bay->index);
 411                                 }
 412                         }
 413                 }
 414         } else {
 415                 bay->last_value = id;
 416                 bay->value_count = 0;
 417         }
 418 }
 419
 420 int check_media_bay(struct device_node *which_bay, int what)
 421 {
 422         int     i;
 423
 424         for (i=0; i<media_bay_count; i++)
 425                 if (media_bays[i].mdev && which_bay == media_bays[i].mdev->ofdev.node) {
 426                         if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up)
 427                                 return 0;
 428                         media_bays[i].cd_index = -1;
 429                         return -EINVAL;
 430                 }
 431         return -ENODEV;
 432 }
 433 EXPORT_SYMBOL(check_media_bay);
 434
 435 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 436 int check_media_bay_by_base(unsigned long base, int what)
 437 {
 438         int     i;
 439
 440         for (i=0; i<media_bay_count; i++)
 441                 if (media_bays[i].mdev && base == (unsigned long) media_bays[i].cd_base) {
 442                         if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up)
 443                                 return 0;
 444                         media_bays[i].cd_index = -1;
 445                         return -EINVAL;
 446                 }
 447
 448         return -ENODEV;
 449 }
 450
 451 int media_bay_set_ide_infos(struct device_node* which_bay, unsigned long base,
 452                             int irq, ide_hwif_t *hwif)
 453 {
 454         int     i;
 455
 456         for (i=0; i<media_bay_count; i++) {
 457                 struct media_bay_info* bay = &media_bays[i];
 458
 459                 if (bay->mdev && which_bay == bay->mdev->ofdev.node) {
 460                         int timeout = 5000, index = hwif->index;
 461
 462                         down(&bay->lock);
 463
 464                         bay->cd_port    = hwif;
 465                         bay->cd_base    = (void __iomem *) base;
 466                         bay->cd_irq     = irq;
 467
 468                         if ((MB_CD != bay->content_id) || bay->state != mb_up) {
 469                                 up(&bay->lock);
 470                                 return 0;
 471                         }
 472                         printk(KERN_DEBUG "Registered ide%d for media bay %d\n", index, i);
 473                         do {
 474                                 if (MB_IDE_READY(i)) {
 475                                         bay->cd_index   = index;
 476                                         up(&bay->lock);
 477                                         return 0;
 478                                 }
 479                                 mdelay(1);
 480                         } while(--timeout);
 481                         printk(KERN_DEBUG "Timeount waiting IDE in bay %d\n", i);
 482                         up(&bay->lock);
 483                         return -ENODEV;
 484                 }
 485         }
 486
 487         return -ENODEV;
 488 }
 489 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 490
 491 static void media_bay_step(int i)
 492 {
 493         struct media_bay_info* bay = &media_bays[i];
 494
 495         /* We don't poll when powering down */
 496         if (bay->state != mb_powering_down)
 497             poll_media_bay(bay);
 498
 499         /* If timer expired or polling IDE busy, run state machine */
 500         if ((bay->state != mb_ide_waiting) && (bay->timer != 0)) {
 501                 bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
 502                 if (bay->timer > 0)
 503                         return;
 504                 bay->timer = 0;
 505         }
 506
 507         switch(bay->state) {
 508         case mb_powering_up:
 509                 if (bay->ops->setup_bus(bay, bay->last_value) < 0) {
 510                         MBDBG("mediabay%d: device not supported (kind:%d)\n", i, bay->content_id);
 511                         set_mb_power(bay, 0);
 512                         break;
 513                 }
 514                 bay->timer = msecs_to_jiffies(MB_RESET_DELAY);
 515                 bay->state = mb_enabling_bay;
 516                 MBDBG("mediabay%d: enabling (kind:%d)\n", i, bay->content_id);
 517                 break;
 518         case mb_enabling_bay:
 519                 bay->ops->un_reset(bay);
 520                 bay->timer = msecs_to_jiffies(MB_SETUP_DELAY);
 521                 bay->state = mb_resetting;
 522                 MBDBG("mediabay%d: waiting reset (kind:%d)\n", i, bay->content_id);
 523                 break;
 524         case mb_resetting:
 525                 if (bay->content_id != MB_CD) {
 526                         MBDBG("mediabay%d: bay is up (kind:%d)\n", i, bay->content_id);
 527                         bay->state = mb_up;
 528                         break;
 529                 }
 530 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 531                 MBDBG("mediabay%d: waiting IDE reset (kind:%d)\n", i, bay->content_id);
 532                 bay->ops->un_reset_ide(bay);
 533                 bay->timer = msecs_to_jiffies(MB_IDE_WAIT);
 534                 bay->state = mb_ide_resetting;
 535 #else
 536                 printk(KERN_DEBUG "media-bay %d is ide (not compiled in kernel)\n", i);
 537                 set_mb_power(bay, 0);
 538 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 539                 break;
 540 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 541         case mb_ide_resetting:
 542                 bay->timer = msecs_to_jiffies(MB_IDE_TIMEOUT);
 543                 bay->state = mb_ide_waiting;
 544                 MBDBG("mediabay%d: waiting IDE ready (kind:%d)\n", i, bay->content_id);
 545                 break;
 546         case mb_ide_waiting:
 547                 if (bay->cd_base == NULL) {
 548                         bay->timer = 0;
 549                         bay->state = mb_up;
 550                         MBDBG("mediabay%d: up before IDE init\n", i);
 551                         break;
 552                 } else if (MB_IDE_READY(i)) {
 553                         bay->timer = 0;
 554                         bay->state = mb_up;
 555                         if (bay->cd_index < 0) {
 556                                 printk("mediabay %d, registering IDE...\n", i);
 557                                 pmu_suspend();
 558                                 ide_port_scan(bay->cd_port);
 559                                 bay->cd_index = bay->cd_port->index;
 560                                 pmu_resume();
 561                         }
 562                         if (bay->cd_index == -1) {
 563                                 /* We eventually do a retry */
 564                                 bay->cd_retry++;
 565                                 printk("IDE register error\n");
 566                                 set_mb_power(bay, 0);
 567                         } else {
 568                                 printk(KERN_DEBUG "media-bay %d is ide%d\n", i, bay->cd_index);
 569                                 MBDBG("mediabay %d IDE ready\n", i);
 570                         }
 571                         break;
 572                 } else if (bay->timer > 0)
 573                         bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
 574                 if (bay->timer <= 0) {
 575                         printk("\nIDE Timeout in bay %d !, IDE state is: 0x%02x\n",
 576                                i, readb(bay->cd_base + 0x70));
 577                         MBDBG("mediabay%d: nIDE Timeout !\n", i);
 578                         set_mb_power(bay, 0);
 579                         bay->timer = 0;
 580                 }
 581                 break;
 582 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 583         case mb_powering_down:
 584                 bay->state = mb_empty;
 585 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 586                 if (bay->cd_index >= 0) {
 587                         printk(KERN_DEBUG "Unregistering mb %d ide, index:%d\n", i,
 588                                bay->cd_index);
 589                         ide_port_unregister_devices(bay->cd_port);
 590                         bay->cd_index = -1;
 591                 }
 592                 if (bay->cd_retry) {
 593                         if (bay->cd_retry > MAX_CD_RETRIES) {
 594                                 /* Should add an error sound (sort of beep in dmasound) */
 595                                 printk("\nmedia-bay %d, IDE device badly inserted or unrecognised\n", i);
 596                         } else {
 597                                 /* Force a new power down/up sequence */
 598                                 bay->content_id = MB_NO;
 599                         }
 600                 }
 601 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 602                 MBDBG("mediabay%d: end of power down\n", i);
 603                 break;
 604         }
 605 }
 606
 607 /*
 608  * This procedure runs as a kernel thread to poll the media bay
 609  * once each tick and register and unregister the IDE interface
 610  * with the IDE driver.  It needs to be a thread because
 611  * ide_register can't be called from interrupt context.
 612  */
 613 static int media_bay_task(void *x)
 614 {
 615         int     i;
 616
 617         while (!kthread_should_stop()) {
 618                 for (i = 0; i < media_bay_count; ++i) {
 619                         down(&media_bays[i].lock);
 620                         if (!media_bays[i].sleeping)
 621                                 media_bay_step(i);
 622                         up(&media_bays[i].lock);
 623                 }
 624
 625                 msleep_interruptible(MB_POLL_DELAY);
 626         }
 627         return 0;
 628 }
 629
 630 static int __devinit media_bay_attach(struct macio_dev *mdev, const struct of_device_id *match)
 631 {
 632         struct media_bay_info* bay;
 633         u32 __iomem *regbase;
 634         struct device_node *ofnode;
 635         unsigned long base;
 636         int i;
 637
 638         ofnode = mdev->ofdev.node;
 639
 640         if (macio_resource_count(mdev) < 1)
 641                 return -ENODEV;
 642         if (macio_request_resources(mdev, "media-bay"))
 643                 return -EBUSY;
 644         /* Media bay registers are located at the beginning of the
 645          * mac-io chip, for now, we trick and align down the first
 646          * resource passed in
 647          */
 648         base = macio_resource_start(mdev, 0) & 0xffff0000u;
 649         regbase = (u32 __iomem *)ioremap(base, 0x100);
 650         if (regbase == NULL) {
 651                 macio_release_resources(mdev);
 652                 return -ENOMEM;
 653         }
 654
 655         i = media_bay_count++;
 656         bay = &media_bays[i];
 657         bay->mdev = mdev;
 658         bay->base = regbase;
 659         bay->index = i;
 660         bay->ops = match->data;
 661         bay->sleeping = 0;
 662         init_MUTEX(&bay->lock);
 663
 664         /* Init HW probing */
 665         if (bay->ops->init)
 666                 bay->ops->init(bay);
 667
 668         printk(KERN_INFO "mediabay%d: Registered %s media-bay\n", i, bay->ops->name);
 669
 670         /* Force an immediate detect */
 671         set_mb_power(bay, 0);
 672         msleep(MB_POWER_DELAY);
 673         bay->content_id = MB_NO;
 674         bay->last_value = bay->ops->content(bay);
 675         bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
 676         bay->state = mb_empty;
 677         do {
 678                 msleep(MB_POLL_DELAY);
 679                 media_bay_step(i);
 680         } while((bay->state != mb_empty) &&
 681                 (bay->state != mb_up));
 682
 683         /* Mark us ready by filling our mdev data */
 684         macio_set_drvdata(mdev, bay);
 685
 686         /* Startup kernel thread */
 687         if (i == 0)
 688                 kthread_run(media_bay_task, NULL, "media-bay");
 689
 690         return 0;
 691
 692 }
 693
 694 static int media_bay_suspend(struct macio_dev *mdev, pm_message_t state)
 695 {
 696         struct media_bay_info   *bay = macio_get_drvdata(mdev);
 697
 698         if (state.event != mdev->ofdev.dev.power.power_state.event
 699             && (state.event & PM_EVENT_SLEEP)) {
 700                 down(&bay->lock);
 701                 bay->sleeping = 1;
 702                 set_mb_power(bay, 0);
 703                 up(&bay->lock);
 704                 msleep(MB_POLL_DELAY);
 705                 mdev->ofdev.dev.power.power_state = state;
 706         }
 707         return 0;
 708 }
 709
 710 static int media_bay_resume(struct macio_dev *mdev)
 711 {
 712         struct media_bay_info   *bay = macio_get_drvdata(mdev);
 713
 714         if (mdev->ofdev.dev.power.power_state.event != PM_EVENT_ON) {
 715                 mdev->ofdev.dev.power.power_state = PMSG_ON;
 716
 717                 /* We re-enable the bay using it's previous content
 718                    only if it did not change. Note those bozo timings,
 719                    they seem to help the 3400 get it right.
 720                  */
 721                 /* Force MB power to 0 */
 722                 down(&bay->lock);
 723                 set_mb_power(bay, 0);
 724                 msleep(MB_POWER_DELAY);
 725                 if (bay->ops->content(bay) != bay->content_id) {
 726                         printk("mediabay%d: content changed during sleep...\n", bay->index);
 727                         up(&bay->lock);
 728                         return 0;
 729                 }
 730                 set_mb_power(bay, 1);
 731                 bay->last_value = bay->content_id;
 732                 bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
 733                 bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
 734 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 735                 bay->cd_retry = 0;
 736 #endif
 737                 do {
 738                         msleep(MB_POLL_DELAY);
 739                         media_bay_step(bay->index);
 740                 } while((bay->state != mb_empty) &&
 741                         (bay->state != mb_up));
 742                 bay->sleeping = 0;
 743                 up(&bay->lock);
 744         }
 745         return 0;
 746 }
 747
 748
 749 /* Definitions of "ops" structures.
 750  */
 751 static struct mb_ops ohare_mb_ops = {
 752         .name           = "Ohare",
 753         .content        = ohare_mb_content,
 754         .power          = ohare_mb_power,
 755         .setup_bus      = ohare_mb_setup_bus,
 756         .un_reset       = ohare_mb_un_reset,
 757         .un_reset_ide   = ohare_mb_un_reset_ide,
 758 };
 759
 760 static struct mb_ops heathrow_mb_ops = {
 761         .name           = "Heathrow",
 762         .content        = heathrow_mb_content,
 763         .power          = heathrow_mb_power,
 764         .setup_bus      = heathrow_mb_setup_bus,
 765         .un_reset       = heathrow_mb_un_reset,
 766         .un_reset_ide   = heathrow_mb_un_reset_ide,
 767 };
 768
 769 static struct mb_ops keylargo_mb_ops = {
 770         .name           = "KeyLargo",
 771         .init           = keylargo_mb_init,
 772         .content        = keylargo_mb_content,
 773         .power          = keylargo_mb_power,
 774         .setup_bus      = keylargo_mb_setup_bus,
 775         .un_reset       = keylargo_mb_un_reset,
 776         .un_reset_ide   = keylargo_mb_un_reset_ide,
 777 };
 778
 779 /*
 780  * It seems that the bit for the media-bay interrupt in the IRQ_LEVEL
 781  * register is always set when there is something in the media bay.
 782  * This causes problems for the interrupt code if we attach an interrupt
 783  * handler to the media-bay interrupt, because it tends to go into
 784  * an infinite loop calling the media bay interrupt handler.
 785  * Therefore we do it all by polling the media bay once each tick.
 786  */
 787
 788 static struct of_device_id media_bay_match[] =
 789 {
 790         {
 791         .name           = "media-bay",
 792         .compatible     = "keylargo-media-bay",
 793         .data           = &keylargo_mb_ops,
 794         },
 795         {
 796         .name           = "media-bay",
 797         .compatible     = "heathrow-media-bay",
 798         .data           = &heathrow_mb_ops,
 799         },
 800         {
 801         .name           = "media-bay",
 802         .compatible     = "ohare-media-bay",
 803         .data           = &ohare_mb_ops,
 804         },
 805         {},
 806 };
 807
 808 static struct macio_driver media_bay_driver =
 809 {
 810         .name           = "media-bay",
 811         .match_table    = media_bay_match,
 812         .probe          = media_bay_attach,
 813         .suspend        = media_bay_suspend,
 814         .resume         = media_bay_resume
 815 };
 816
 817 static int __init media_bay_init(void)
 818 {
 819         int i;
 820
 821         for (i=0; i<MAX_BAYS; i++) {
 822                 memset((char *)&media_bays[i], 0, sizeof(struct media_bay_info));
 823                 media_bays[i].content_id        = -1;
 824 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 825                 media_bays[i].cd_index          = -1;
 826 #endif
 827         }
 828         if (!machine_is(powermac))
 829                 return 0;
 830
 831         macio_register_driver(&media_bay_driver);
 832
 833         return 0;
 834 }
 835
 836 device_initcall(media_bay_init);