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 <linux/mutex.h>
  25 #include <asm/prom.h>
  26 #include <asm/pgtable.h>
  27 #include <asm/io.h>
  28 #include <asm/machdep.h>
  29 #include <asm/pmac_feature.h>
  30 #include <asm/mediabay.h>
  31 #include <asm/sections.h>
  32 #include <asm/ohare.h>
  33 #include <asm/heathrow.h>
  34 #include <asm/keylargo.h>
  35 #include <linux/adb.h>
  36 #include <linux/pmu.h>
  37
  38
  39 #define MB_DEBUG
  40
  41 #ifdef MB_DEBUG
  42 #define MBDBG(fmt, arg...)      printk(KERN_INFO fmt , ## arg)
  43 #else
  44 #define MBDBG(fmt, arg...)      do { } while (0)
  45 #endif
  46
  47 #define MB_FCR32(bay, r)        ((bay)->base + ((r) >> 2))
  48 #define MB_FCR8(bay, r)         (((volatile u8 __iomem *)((bay)->base)) + (r))
  49
  50 #define MB_IN32(bay,r)          (in_le32(MB_FCR32(bay,r)))
  51 #define MB_OUT32(bay,r,v)       (out_le32(MB_FCR32(bay,r), (v)))
  52 #define MB_BIS(bay,r,v)         (MB_OUT32((bay), (r), MB_IN32((bay), r) | (v)))
  53 #define MB_BIC(bay,r,v)         (MB_OUT32((bay), (r), MB_IN32((bay), r) & ~(v)))
  54 #define MB_IN8(bay,r)           (in_8(MB_FCR8(bay,r)))
  55 #define MB_OUT8(bay,r,v)        (out_8(MB_FCR8(bay,r), (v)))
  56
  57 struct media_bay_info;
  58
  59 struct mb_ops {
  60         char*   name;
  61         void    (*init)(struct media_bay_info *bay);
  62         u8      (*content)(struct media_bay_info *bay);
  63         void    (*power)(struct media_bay_info *bay, int on_off);
  64         int     (*setup_bus)(struct media_bay_info *bay, u8 device_id);
  65         void    (*un_reset)(struct media_bay_info *bay);
  66         void    (*un_reset_ide)(struct media_bay_info *bay);
  67 };
  68
  69 struct media_bay_info {
  70         u32 __iomem                     *base;
  71         int                             content_id;
  72         int                             state;
  73         int                             last_value;
  74         int                             value_count;
  75         int                             timer;
  76         struct macio_dev                *mdev;
  77         struct mb_ops*                  ops;
  78         int                             index;
  79         int                             cached_gpio;
  80         int                             sleeping;
  81         struct mutex                    lock;
  82 #ifdef CONFIG_BLK_DEV_IDE_PMAC
  83         ide_hwif_t                      *cd_port;
  84         void __iomem                    *cd_base;
  85         int                             cd_irq;
  86         int                             cd_retry;
  87 #endif
  88 #if defined(CONFIG_BLK_DEV_IDE_PMAC)
  89         int                             cd_index;
  90 #endif
  91 };
  92
  93 #define MAX_BAYS        2
  94
  95 static struct media_bay_info media_bays[MAX_BAYS];
  96 int media_bay_count = 0;
  97
  98 #ifdef CONFIG_BLK_DEV_IDE_PMAC
  99 /* check the busy bit in the media-bay ide interface
 100    (assumes the media-bay contains an ide device) */
 101 #define MB_IDE_READY(i) ((readb(media_bays[i].cd_base + 0x70) & 0x80) == 0)
 102 #endif
 103
 104 /*
 105  * Wait that number of ms between each step in normal polling mode
 106  */
 107 #define MB_POLL_DELAY   25
 108
 109 /*
 110  * Consider the media-bay ID value stable if it is the same for
 111  * this number of milliseconds
 112  */
 113 #define MB_STABLE_DELAY 100
 114
 115 /* Wait after powering up the media bay this delay in ms
 116  * timeout bumped for some powerbooks
 117  */
 118 #define MB_POWER_DELAY  200
 119
 120 /*
 121  * Hold the media-bay reset signal true for this many ticks
 122  * after a device is inserted before releasing it.
 123  */
 124 #define MB_RESET_DELAY  50
 125
 126 /*
 127  * Wait this long after the reset signal is released and before doing
 128  * further operations. After this delay, the IDE reset signal is released
 129  * too for an IDE device
 130  */
 131 #define MB_SETUP_DELAY  100
 132
 133 /*
 134  * Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted
 135  * (or until the device is ready) before waiting for busy bit to disappear
 136  */
 137 #define MB_IDE_WAIT     1000
 138
 139 /*
 140  * Timeout waiting for busy bit of an IDE device to go down
 141  */
 142 #define MB_IDE_TIMEOUT  5000
 143
 144 /*
 145  * Max retries of the full power up/down sequence for an IDE device
 146  */
 147 #define MAX_CD_RETRIES  3
 148
 149 /*
 150  * States of a media bay
 151  */
 152 enum {
 153         mb_empty = 0,           /* Idle */
 154         mb_powering_up,         /* power bit set, waiting MB_POWER_DELAY */
 155         mb_enabling_bay,        /* enable bits set, waiting MB_RESET_DELAY */
 156         mb_resetting,           /* reset bit unset, waiting MB_SETUP_DELAY */
 157         mb_ide_resetting,       /* IDE reset bit unser, waiting MB_IDE_WAIT */
 158         mb_ide_waiting,         /* Waiting for BUSY bit to go away until MB_IDE_TIMEOUT */
 159         mb_up,                  /* Media bay full */
 160         mb_powering_down        /* Powering down (avoid too fast down/up) */
 161 };
 162
 163 #define MB_POWER_SOUND          0x08
 164 #define MB_POWER_FLOPPY         0x04
 165 #define MB_POWER_ATA            0x02
 166 #define MB_POWER_PCI            0x01
 167 #define MB_POWER_OFF            0x00
 168
 169 /*
 170  * Functions for polling content of media bay
 171  */
 172
 173 static u8
 174 ohare_mb_content(struct media_bay_info *bay)
 175 {
 176         return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
 177 }
 178
 179 static u8
 180 heathrow_mb_content(struct media_bay_info *bay)
 181 {
 182         return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
 183 }
 184
 185 static u8
 186 keylargo_mb_content(struct media_bay_info *bay)
 187 {
 188         int new_gpio;
 189
 190         new_gpio = MB_IN8(bay, KL_GPIO_MEDIABAY_IRQ) & KEYLARGO_GPIO_INPUT_DATA;
 191         if (new_gpio) {
 192                 bay->cached_gpio = new_gpio;
 193                 return MB_NO;
 194         } else if (bay->cached_gpio != new_gpio) {
 195                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
 196                 (void)MB_IN32(bay, KEYLARGO_MBCR);
 197                 udelay(5);
 198                 MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
 199                 (void)MB_IN32(bay, KEYLARGO_MBCR);
 200                 udelay(5);
 201                 bay->cached_gpio = new_gpio;
 202         }
 203         return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7;
 204 }
 205
 206 /*
 207  * Functions for powering up/down the bay, puts the bay device
 208  * into reset state as well
 209  */
 210
 211 static void
 212 ohare_mb_power(struct media_bay_info* bay, int on_off)
 213 {
 214         if (on_off) {
 215                 /* Power up device, assert it's reset line */
 216                 MB_BIC(bay, OHARE_FCR, OH_BAY_RESET_N);
 217                 MB_BIC(bay, OHARE_FCR, OH_BAY_POWER_N);
 218         } else {
 219                 /* Disable all devices */
 220                 MB_BIC(bay, OHARE_FCR, OH_BAY_DEV_MASK);
 221                 MB_BIC(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
 222                 /* Cut power from bay, release reset line */
 223                 MB_BIS(bay, OHARE_FCR, OH_BAY_POWER_N);
 224                 MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
 225                 MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
 226         }
 227         MB_BIC(bay, OHARE_MBCR, 0x00000F00);
 228 }
 229
 230 static void
 231 heathrow_mb_power(struct media_bay_info* bay, int on_off)
 232 {
 233         if (on_off) {
 234                 /* Power up device, assert it's reset line */
 235                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 236                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
 237         } else {
 238                 /* Disable all devices */
 239                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_DEV_MASK);
 240                 MB_BIC(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
 241                 /* Cut power from bay, release reset line */
 242                 MB_BIS(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
 243                 MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 244                 MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 245         }
 246         MB_BIC(bay, HEATHROW_MBCR, 0x00000F00);
 247 }
 248
 249 static void
 250 keylargo_mb_power(struct media_bay_info* bay, int on_off)
 251 {
 252         if (on_off) {
 253                 /* Power up device, assert it's reset line */
 254                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 255                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
 256         } else {
 257                 /* Disable all devices */
 258                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_MASK);
 259                 MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
 260                 /* Cut power from bay, release reset line */
 261                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
 262                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 263                 MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 264         }
 265         MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
 266 }
 267
 268 /*
 269  * Functions for configuring the media bay for a given type of device,
 270  * enable the related busses
 271  */
 272
 273 static int
 274 ohare_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 275 {
 276         switch(device_id) {
 277                 case MB_FD:
 278                 case MB_FD1:
 279                         MB_BIS(bay, OHARE_FCR, OH_BAY_FLOPPY_ENABLE);
 280                         MB_BIS(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
 281                         return 0;
 282                 case MB_CD:
 283                         MB_BIC(bay, OHARE_FCR, OH_IDE1_RESET_N);
 284                         MB_BIS(bay, OHARE_FCR, OH_BAY_IDE_ENABLE);
 285                         return 0;
 286                 case MB_PCI:
 287                         MB_BIS(bay, OHARE_FCR, OH_BAY_PCI_ENABLE);
 288                         return 0;
 289         }
 290         return -ENODEV;
 291 }
 292
 293 static int
 294 heathrow_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 295 {
 296         switch(device_id) {
 297                 case MB_FD:
 298                 case MB_FD1:
 299                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_FLOPPY_ENABLE);
 300                         MB_BIS(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
 301                         return 0;
 302                 case MB_CD:
 303                         MB_BIC(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 304                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_IDE_ENABLE);
 305                         return 0;
 306                 case MB_PCI:
 307                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_PCI_ENABLE);
 308                         return 0;
 309         }
 310         return -ENODEV;
 311 }
 312
 313 static int
 314 keylargo_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 315 {
 316         switch(device_id) {
 317                 case MB_CD:
 318                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_IDE_ENABLE);
 319                         MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 320                         MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
 321                         return 0;
 322                 case MB_PCI:
 323                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_PCI_ENABLE);
 324                         return 0;
 325                 case MB_SOUND:
 326                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_SOUND_ENABLE);
 327                         return 0;
 328         }
 329         return -ENODEV;
 330 }
 331
 332 /*
 333  * Functions for tweaking resets
 334  */
 335
 336 static void
 337 ohare_mb_un_reset(struct media_bay_info* bay)
 338 {
 339         MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
 340 }
 341
 342 static void keylargo_mb_init(struct media_bay_info *bay)
 343 {
 344         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
 345 }
 346
 347 static void heathrow_mb_un_reset(struct media_bay_info* bay)
 348 {
 349         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 350 }
 351
 352 static void keylargo_mb_un_reset(struct media_bay_info* bay)
 353 {
 354         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 355 }
 356
 357 static void ohare_mb_un_reset_ide(struct media_bay_info* bay)
 358 {
 359         MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
 360 }
 361
 362 static void heathrow_mb_un_reset_ide(struct media_bay_info* bay)
 363 {
 364         MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 365 }
 366
 367 static void keylargo_mb_un_reset_ide(struct media_bay_info* bay)
 368 {
 369         MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 370 }
 371
 372 static inline void set_mb_power(struct media_bay_info* bay, int onoff)
 373 {
 374         /* Power up up and assert the bay reset line */
 375         if (onoff) {
 376                 bay->ops->power(bay, 1);
 377                 bay->state = mb_powering_up;
 378                 MBDBG("mediabay%d: powering up\n", bay->index);
 379         } else {
 380                 /* Make sure everything is powered down & disabled */
 381                 bay->ops->power(bay, 0);
 382                 bay->state = mb_powering_down;
 383                 MBDBG("mediabay%d: powering down\n", bay->index);
 384         }
 385         bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
 386 }
 387
 388 static void poll_media_bay(struct media_bay_info* bay)
 389 {
 390         int id = bay->ops->content(bay);
 391
 392         if (id == bay->last_value) {
 393                 if (id != bay->content_id) {
 394                         bay->value_count += msecs_to_jiffies(MB_POLL_DELAY);
 395                         if (bay->value_count >= msecs_to_jiffies(MB_STABLE_DELAY)) {
 396                                 /* If the device type changes without going thru
 397                                  * "MB_NO", we force a pass by "MB_NO" to make sure
 398                                  * things are properly reset
 399                                  */
 400                                 if ((id != MB_NO) && (bay->content_id != MB_NO)) {
 401                                         id = MB_NO;
 402                                         MBDBG("mediabay%d: forcing MB_NO\n", bay->index);
 403                                 }
 404                                 MBDBG("mediabay%d: switching to %d\n", bay->index, id);
 405                                 set_mb_power(bay, id != MB_NO);
 406                                 bay->content_id = id;
 407                                 if (id == MB_NO) {
 408 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 409                                         bay->cd_retry = 0;
 410 #endif
 411                                         printk(KERN_INFO "media bay %d is empty\n", bay->index);
 412                                 }
 413                         }
 414                 }
 415         } else {
 416                 bay->last_value = id;
 417                 bay->value_count = 0;
 418         }
 419 }
 420
 421 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 422 int check_media_bay(struct device_node *which_bay, int what)
 423 {
 424         int     i;
 425
 426         for (i=0; i<media_bay_count; i++)
 427                 if (media_bays[i].mdev && which_bay == media_bays[i].mdev->ofdev.node) {
 428                         if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up)
 429                                 return 0;
 430                         media_bays[i].cd_index = -1;
 431                         return -EINVAL;
 432                 }
 433         return -ENODEV;
 434 }
 435 EXPORT_SYMBOL(check_media_bay);
 436
 437 int check_media_bay_by_base(unsigned long base, int what)
 438 {
 439         int     i;
 440
 441         for (i=0; i<media_bay_count; i++)
 442                 if (media_bays[i].mdev && base == (unsigned long) media_bays[i].cd_base) {
 443                         if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up)
 444                                 return 0;
 445                         media_bays[i].cd_index = -1;
 446                         return -EINVAL;
 447                 }
 448
 449         return -ENODEV;
 450 }
 451
 452 int media_bay_set_ide_infos(struct device_node* which_bay, unsigned long base,
 453                             int irq, ide_hwif_t *hwif)
 454 {
 455         int     i;
 456
 457         for (i=0; i<media_bay_count; i++) {
 458                 struct media_bay_info* bay = &media_bays[i];
 459
 460                 if (bay->mdev && which_bay == bay->mdev->ofdev.node) {
 461                         int timeout = 5000, index = hwif->index;
 462
 463                         mutex_lock(&bay->lock);
 464
 465                         bay->cd_port    = hwif;
 466                         bay->cd_base    = (void __iomem *) base;
 467                         bay->cd_irq     = irq;
 468
 469                         if ((MB_CD != bay->content_id) || bay->state != mb_up) {
 470                                 mutex_unlock(&bay->lock);
 471                                 return 0;
 472                         }
 473                         printk(KERN_DEBUG "Registered ide%d for media bay %d\n", index, i);
 474                         do {
 475                                 if (MB_IDE_READY(i)) {
 476                                         bay->cd_index   = index;
 477                                         mutex_unlock(&bay->lock);
 478                                         return 0;
 479                                 }
 480                                 mdelay(1);
 481                         } while(--timeout);
 482                         printk(KERN_DEBUG "Timeount waiting IDE in bay %d\n", i);
 483                         mutex_unlock(&bay->lock);
 484                         return -ENODEV;
 485                 }
 486         }
 487
 488         return -ENODEV;
 489 }
 490 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 491
 492 static void media_bay_step(int i)
 493 {
 494         struct media_bay_info* bay = &media_bays[i];
 495
 496         /* We don't poll when powering down */
 497         if (bay->state != mb_powering_down)
 498             poll_media_bay(bay);
 499
 500         /* If timer expired or polling IDE busy, run state machine */
 501         if ((bay->state != mb_ide_waiting) && (bay->timer != 0)) {
 502                 bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
 503                 if (bay->timer > 0)
 504                         return;
 505                 bay->timer = 0;
 506         }
 507
 508         switch(bay->state) {
 509         case mb_powering_up:
 510                 if (bay->ops->setup_bus(bay, bay->last_value) < 0) {
 511                         MBDBG("mediabay%d: device not supported (kind:%d)\n", i, bay->content_id);
 512                         set_mb_power(bay, 0);
 513                         break;
 514                 }
 515                 bay->timer = msecs_to_jiffies(MB_RESET_DELAY);
 516                 bay->state = mb_enabling_bay;
 517                 MBDBG("mediabay%d: enabling (kind:%d)\n", i, bay->content_id);
 518                 break;
 519         case mb_enabling_bay:
 520                 bay->ops->un_reset(bay);
 521                 bay->timer = msecs_to_jiffies(MB_SETUP_DELAY);
 522                 bay->state = mb_resetting;
 523                 MBDBG("mediabay%d: waiting reset (kind:%d)\n", i, bay->content_id);
 524                 break;
 525         case mb_resetting:
 526                 if (bay->content_id != MB_CD) {
 527                         MBDBG("mediabay%d: bay is up (kind:%d)\n", i, bay->content_id);
 528                         bay->state = mb_up;
 529                         break;
 530                 }
 531 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 532                 MBDBG("mediabay%d: waiting IDE reset (kind:%d)\n", i, bay->content_id);
 533                 bay->ops->un_reset_ide(bay);
 534                 bay->timer = msecs_to_jiffies(MB_IDE_WAIT);
 535                 bay->state = mb_ide_resetting;
 536 #else
 537                 printk(KERN_DEBUG "media-bay %d is ide (not compiled in kernel)\n", i);
 538                 set_mb_power(bay, 0);
 539 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 540                 break;
 541 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 542         case mb_ide_resetting:
 543                 bay->timer = msecs_to_jiffies(MB_IDE_TIMEOUT);
 544                 bay->state = mb_ide_waiting;
 545                 MBDBG("mediabay%d: waiting IDE ready (kind:%d)\n", i, bay->content_id);
 546                 break;
 547         case mb_ide_waiting:
 548                 if (bay->cd_base == NULL) {
 549                         bay->timer = 0;
 550                         bay->state = mb_up;
 551                         MBDBG("mediabay%d: up before IDE init\n", i);
 552                         break;
 553                 } else if (MB_IDE_READY(i)) {
 554                         bay->timer = 0;
 555                         bay->state = mb_up;
 556                         if (bay->cd_index < 0) {
 557                                 printk("mediabay %d, registering IDE...\n", i);
 558                                 pmu_suspend();
 559                                 ide_port_scan(bay->cd_port);
 560                                 if (bay->cd_port->present)
 561                                         bay->cd_index = bay->cd_port->index;
 562                                 pmu_resume();
 563                         }
 564                         if (bay->cd_index == -1) {
 565                                 /* We eventually do a retry */
 566                                 bay->cd_retry++;
 567                                 printk("IDE register error\n");
 568                                 set_mb_power(bay, 0);
 569                         } else {
 570                                 printk(KERN_DEBUG "media-bay %d is ide%d\n", i, bay->cd_index);
 571                                 MBDBG("mediabay %d IDE ready\n", i);
 572                         }
 573                         break;
 574                 } else if (bay->timer > 0)
 575                         bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
 576                 if (bay->timer <= 0) {
 577                         printk("\nIDE Timeout in bay %d !, IDE state is: 0x%02x\n",
 578                                i, readb(bay->cd_base + 0x70));
 579                         MBDBG("mediabay%d: nIDE Timeout !\n", i);
 580                         set_mb_power(bay, 0);
 581                         bay->timer = 0;
 582                 }
 583                 break;
 584 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 585         case mb_powering_down:
 586                 bay->state = mb_empty;
 587 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 588                 if (bay->cd_index >= 0) {
 589                         printk(KERN_DEBUG "Unregistering mb %d ide, index:%d\n", i,
 590                                bay->cd_index);
 591                         ide_port_unregister_devices(bay->cd_port);
 592                         bay->cd_index = -1;
 593                 }
 594                 if (bay->cd_retry) {
 595                         if (bay->cd_retry > MAX_CD_RETRIES) {
 596                                 /* Should add an error sound (sort of beep in dmasound) */
 597                                 printk("\nmedia-bay %d, IDE device badly inserted or unrecognised\n", i);
 598                         } else {
 599                                 /* Force a new power down/up sequence */
 600                                 bay->content_id = MB_NO;
 601                         }
 602                 }
 603 #endif /* CONFIG_BLK_DEV_IDE_PMAC */
 604                 MBDBG("mediabay%d: end of power down\n", i);
 605                 break;
 606         }
 607 }
 608
 609 /*
 610  * This procedure runs as a kernel thread to poll the media bay
 611  * once each tick and register and unregister the IDE interface
 612  * with the IDE driver.  It needs to be a thread because
 613  * ide_register can't be called from interrupt context.
 614  */
 615 static int media_bay_task(void *x)
 616 {
 617         int     i;
 618
 619         while (!kthread_should_stop()) {
 620                 for (i = 0; i < media_bay_count; ++i) {
 621                         mutex_lock(&media_bays[i].lock);
 622                         if (!media_bays[i].sleeping)
 623                                 media_bay_step(i);
 624                         mutex_unlock(&media_bays[i].lock);
 625                 }
 626
 627                 msleep_interruptible(MB_POLL_DELAY);
 628         }
 629         return 0;
 630 }
 631
 632 static int __devinit media_bay_attach(struct macio_dev *mdev, const struct of_device_id *match)
 633 {
 634         struct media_bay_info* bay;
 635         u32 __iomem *regbase;
 636         struct device_node *ofnode;
 637         unsigned long base;
 638         int i;
 639
 640         ofnode = mdev->ofdev.node;
 641
 642         if (macio_resource_count(mdev) < 1)
 643                 return -ENODEV;
 644         if (macio_request_resources(mdev, "media-bay"))
 645                 return -EBUSY;
 646         /* Media bay registers are located at the beginning of the
 647          * mac-io chip, for now, we trick and align down the first
 648          * resource passed in
 649          */
 650         base = macio_resource_start(mdev, 0) & 0xffff0000u;
 651         regbase = (u32 __iomem *)ioremap(base, 0x100);
 652         if (regbase == NULL) {
 653                 macio_release_resources(mdev);
 654                 return -ENOMEM;
 655         }
 656
 657         i = media_bay_count++;
 658         bay = &media_bays[i];
 659         bay->mdev = mdev;
 660         bay->base = regbase;
 661         bay->index = i;
 662         bay->ops = match->data;
 663         bay->sleeping = 0;
 664         mutex_init(&bay->lock);
 665
 666         /* Init HW probing */
 667         if (bay->ops->init)
 668                 bay->ops->init(bay);
 669
 670         printk(KERN_INFO "mediabay%d: Registered %s media-bay\n", i, bay->ops->name);
 671
 672         /* Force an immediate detect */
 673         set_mb_power(bay, 0);
 674         msleep(MB_POWER_DELAY);
 675         bay->content_id = MB_NO;
 676         bay->last_value = bay->ops->content(bay);
 677         bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
 678         bay->state = mb_empty;
 679         do {
 680                 msleep(MB_POLL_DELAY);
 681                 media_bay_step(i);
 682         } while((bay->state != mb_empty) &&
 683                 (bay->state != mb_up));
 684
 685         /* Mark us ready by filling our mdev data */
 686         macio_set_drvdata(mdev, bay);
 687
 688         /* Startup kernel thread */
 689         if (i == 0)
 690                 kthread_run(media_bay_task, NULL, "media-bay");
 691
 692         return 0;
 693
 694 }
 695
 696 static int media_bay_suspend(struct macio_dev *mdev, pm_message_t state)
 697 {
 698         struct media_bay_info   *bay = macio_get_drvdata(mdev);
 699
 700         if (state.event != mdev->ofdev.dev.power.power_state.event
 701             && (state.event & PM_EVENT_SLEEP)) {
 702                 mutex_lock(&bay->lock);
 703                 bay->sleeping = 1;
 704                 set_mb_power(bay, 0);
 705                 mutex_unlock(&bay->lock);
 706                 msleep(MB_POLL_DELAY);
 707                 mdev->ofdev.dev.power.power_state = state;
 708         }
 709         return 0;
 710 }
 711
 712 static int media_bay_resume(struct macio_dev *mdev)
 713 {
 714         struct media_bay_info   *bay = macio_get_drvdata(mdev);
 715
 716         if (mdev->ofdev.dev.power.power_state.event != PM_EVENT_ON) {
 717                 mdev->ofdev.dev.power.power_state = PMSG_ON;
 718
 719                 /* We re-enable the bay using it's previous content
 720                    only if it did not change. Note those bozo timings,
 721                    they seem to help the 3400 get it right.
 722                  */
 723                 /* Force MB power to 0 */
 724                 mutex_lock(&bay->lock);
 725                 set_mb_power(bay, 0);
 726                 msleep(MB_POWER_DELAY);
 727                 if (bay->ops->content(bay) != bay->content_id) {
 728                         printk("mediabay%d: content changed during sleep...\n", bay->index);
 729                         mutex_unlock(&bay->lock);
 730                         return 0;
 731                 }
 732                 set_mb_power(bay, 1);
 733                 bay->last_value = bay->content_id;
 734                 bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
 735                 bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
 736 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 737                 bay->cd_retry = 0;
 738 #endif
 739                 do {
 740                         msleep(MB_POLL_DELAY);
 741                         media_bay_step(bay->index);
 742                 } while((bay->state != mb_empty) &&
 743                         (bay->state != mb_up));
 744                 bay->sleeping = 0;
 745                 mutex_unlock(&bay->lock);
 746         }
 747         return 0;
 748 }
 749
 750
 751 /* Definitions of "ops" structures.
 752  */
 753 static struct mb_ops ohare_mb_ops = {
 754         .name           = "Ohare",
 755         .content        = ohare_mb_content,
 756         .power          = ohare_mb_power,
 757         .setup_bus      = ohare_mb_setup_bus,
 758         .un_reset       = ohare_mb_un_reset,
 759         .un_reset_ide   = ohare_mb_un_reset_ide,
 760 };
 761
 762 static struct mb_ops heathrow_mb_ops = {
 763         .name           = "Heathrow",
 764         .content        = heathrow_mb_content,
 765         .power          = heathrow_mb_power,
 766         .setup_bus      = heathrow_mb_setup_bus,
 767         .un_reset       = heathrow_mb_un_reset,
 768         .un_reset_ide   = heathrow_mb_un_reset_ide,
 769 };
 770
 771 static struct mb_ops keylargo_mb_ops = {
 772         .name           = "KeyLargo",
 773         .init           = keylargo_mb_init,
 774         .content        = keylargo_mb_content,
 775         .power          = keylargo_mb_power,
 776         .setup_bus      = keylargo_mb_setup_bus,
 777         .un_reset       = keylargo_mb_un_reset,
 778         .un_reset_ide   = keylargo_mb_un_reset_ide,
 779 };
 780
 781 /*
 782  * It seems that the bit for the media-bay interrupt in the IRQ_LEVEL
 783  * register is always set when there is something in the media bay.
 784  * This causes problems for the interrupt code if we attach an interrupt
 785  * handler to the media-bay interrupt, because it tends to go into
 786  * an infinite loop calling the media bay interrupt handler.
 787  * Therefore we do it all by polling the media bay once each tick.
 788  */
 789
 790 static struct of_device_id media_bay_match[] =
 791 {
 792         {
 793         .name           = "media-bay",
 794         .compatible     = "keylargo-media-bay",
 795         .data           = &keylargo_mb_ops,
 796         },
 797         {
 798         .name           = "media-bay",
 799         .compatible     = "heathrow-media-bay",
 800         .data           = &heathrow_mb_ops,
 801         },
 802         {
 803         .name           = "media-bay",
 804         .compatible     = "ohare-media-bay",
 805         .data           = &ohare_mb_ops,
 806         },
 807         {},
 808 };
 809
 810 static struct macio_driver media_bay_driver =
 811 {
 812         .name           = "media-bay",
 813         .match_table    = media_bay_match,
 814         .probe          = media_bay_attach,
 815         .suspend        = media_bay_suspend,
 816         .resume         = media_bay_resume
 817 };
 818
 819 static int __init media_bay_init(void)
 820 {
 821         int i;
 822
 823         for (i=0; i<MAX_BAYS; i++) {
 824                 memset((char *)&media_bays[i], 0, sizeof(struct media_bay_info));
 825                 media_bays[i].content_id        = -1;
 826 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 827                 media_bays[i].cd_index          = -1;
 828 #endif
 829         }
 830         if (!machine_is(powermac))
 831                 return 0;
 832
 833         macio_register_driver(&media_bay_driver);
 834
 835         return 0;
 836 }
 837
 838 device_initcall(media_bay_init);