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
  37 #define MB_DEBUG
  38
  39 #ifdef MB_DEBUG
  40 #define MBDBG(fmt, arg...)      printk(KERN_INFO fmt , ## arg)
  41 #else
  42 #define MBDBG(fmt, arg...)      do { } while (0)
  43 #endif
  44
  45 #define MB_FCR32(bay, r)        ((bay)->base + ((r) >> 2))
  46 #define MB_FCR8(bay, r)         (((volatile u8 __iomem *)((bay)->base)) + (r))
  47
  48 #define MB_IN32(bay,r)          (in_le32(MB_FCR32(bay,r)))
  49 #define MB_OUT32(bay,r,v)       (out_le32(MB_FCR32(bay,r), (v)))
  50 #define MB_BIS(bay,r,v)         (MB_OUT32((bay), (r), MB_IN32((bay), r) | (v)))
  51 #define MB_BIC(bay,r,v)         (MB_OUT32((bay), (r), MB_IN32((bay), r) & ~(v)))
  52 #define MB_IN8(bay,r)           (in_8(MB_FCR8(bay,r)))
  53 #define MB_OUT8(bay,r,v)        (out_8(MB_FCR8(bay,r), (v)))
  54
  55 struct media_bay_info;
  56
  57 struct mb_ops {
  58         char*   name;
  59         void    (*init)(struct media_bay_info *bay);
  60         u8      (*content)(struct media_bay_info *bay);
  61         void    (*power)(struct media_bay_info *bay, int on_off);
  62         int     (*setup_bus)(struct media_bay_info *bay, u8 device_id);
  63         void    (*un_reset)(struct media_bay_info *bay);
  64         void    (*un_reset_ide)(struct media_bay_info *bay);
  65 };
  66
  67 struct media_bay_info {
  68         u32 __iomem                     *base;
  69         int                             content_id;
  70         int                             state;
  71         int                             last_value;
  72         int                             value_count;
  73         int                             timer;
  74         struct macio_dev                *mdev;
  75         struct mb_ops*                  ops;
  76         int                             index;
  77         int                             cached_gpio;
  78         int                             sleeping;
  79         struct mutex                    lock;
  80 #ifdef CONFIG_BLK_DEV_IDE_PMAC
  81         ide_hwif_t                      *cd_port;
  82         void __iomem                    *cd_base;
  83         int                             cd_irq;
  84         int                             cd_retry;
  85 #endif
  86 #if defined(CONFIG_BLK_DEV_IDE_PMAC)
  87         int                             cd_index;
  88 #endif
  89 };
  90
  91 #define MAX_BAYS        2
  92
  93 static struct media_bay_info media_bays[MAX_BAYS];
  94 int media_bay_count = 0;
  95
  96 #ifdef CONFIG_BLK_DEV_IDE_PMAC
  97 /* check the busy bit in the media-bay ide interface
  98    (assumes the media-bay contains an ide device) */
  99 #define MB_IDE_READY(i) ((readb(media_bays[i].cd_base + 0x70) & 0x80) == 0)
 100 #endif
 101
 102 /*
 103  * Wait that number of ms between each step in normal polling mode
 104  */
 105 #define MB_POLL_DELAY   25
 106
 107 /*
 108  * Consider the media-bay ID value stable if it is the same for
 109  * this number of milliseconds
 110  */
 111 #define MB_STABLE_DELAY 100
 112
 113 /* Wait after powering up the media bay this delay in ms
 114  * timeout bumped for some powerbooks
 115  */
 116 #define MB_POWER_DELAY  200
 117
 118 /*
 119  * Hold the media-bay reset signal true for this many ticks
 120  * after a device is inserted before releasing it.
 121  */
 122 #define MB_RESET_DELAY  50
 123
 124 /*
 125  * Wait this long after the reset signal is released and before doing
 126  * further operations. After this delay, the IDE reset signal is released
 127  * too for an IDE device
 128  */
 129 #define MB_SETUP_DELAY  100
 130
 131 /*
 132  * Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted
 133  * (or until the device is ready) before waiting for busy bit to disappear
 134  */
 135 #define MB_IDE_WAIT     1000
 136
 137 /*
 138  * Timeout waiting for busy bit of an IDE device to go down
 139  */
 140 #define MB_IDE_TIMEOUT  5000
 141
 142 /*
 143  * Max retries of the full power up/down sequence for an IDE device
 144  */
 145 #define MAX_CD_RETRIES  3
 146
 147 /*
 148  * States of a media bay
 149  */
 150 enum {
 151         mb_empty = 0,           /* Idle */
 152         mb_powering_up,         /* power bit set, waiting MB_POWER_DELAY */
 153         mb_enabling_bay,        /* enable bits set, waiting MB_RESET_DELAY */
 154         mb_resetting,           /* reset bit unset, waiting MB_SETUP_DELAY */
 155         mb_ide_resetting,       /* IDE reset bit unser, waiting MB_IDE_WAIT */
 156         mb_ide_waiting,         /* Waiting for BUSY bit to go away until MB_IDE_TIMEOUT */
 157         mb_up,                  /* Media bay full */
 158         mb_powering_down        /* Powering down (avoid too fast down/up) */
 159 };
 160
 161 #define MB_POWER_SOUND          0x08
 162 #define MB_POWER_FLOPPY         0x04
 163 #define MB_POWER_ATA            0x02
 164 #define MB_POWER_PCI            0x01
 165 #define MB_POWER_OFF            0x00
 166
 167 /*
 168  * Functions for polling content of media bay
 169  */
 170
 171 static u8
 172 ohare_mb_content(struct media_bay_info *bay)
 173 {
 174         return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
 175 }
 176
 177 static u8
 178 heathrow_mb_content(struct media_bay_info *bay)
 179 {
 180         return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
 181 }
 182
 183 static u8
 184 keylargo_mb_content(struct media_bay_info *bay)
 185 {
 186         int new_gpio;
 187
 188         new_gpio = MB_IN8(bay, KL_GPIO_MEDIABAY_IRQ) & KEYLARGO_GPIO_INPUT_DATA;
 189         if (new_gpio) {
 190                 bay->cached_gpio = new_gpio;
 191                 return MB_NO;
 192         } else if (bay->cached_gpio != new_gpio) {
 193                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
 194                 (void)MB_IN32(bay, KEYLARGO_MBCR);
 195                 udelay(5);
 196                 MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
 197                 (void)MB_IN32(bay, KEYLARGO_MBCR);
 198                 udelay(5);
 199                 bay->cached_gpio = new_gpio;
 200         }
 201         return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7;
 202 }
 203
 204 /*
 205  * Functions for powering up/down the bay, puts the bay device
 206  * into reset state as well
 207  */
 208
 209 static void
 210 ohare_mb_power(struct media_bay_info* bay, int on_off)
 211 {
 212         if (on_off) {
 213                 /* Power up device, assert it's reset line */
 214                 MB_BIC(bay, OHARE_FCR, OH_BAY_RESET_N);
 215                 MB_BIC(bay, OHARE_FCR, OH_BAY_POWER_N);
 216         } else {
 217                 /* Disable all devices */
 218                 MB_BIC(bay, OHARE_FCR, OH_BAY_DEV_MASK);
 219                 MB_BIC(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
 220                 /* Cut power from bay, release reset line */
 221                 MB_BIS(bay, OHARE_FCR, OH_BAY_POWER_N);
 222                 MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
 223                 MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
 224         }
 225         MB_BIC(bay, OHARE_MBCR, 0x00000F00);
 226 }
 227
 228 static void
 229 heathrow_mb_power(struct media_bay_info* bay, int on_off)
 230 {
 231         if (on_off) {
 232                 /* Power up device, assert it's reset line */
 233                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 234                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
 235         } else {
 236                 /* Disable all devices */
 237                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_DEV_MASK);
 238                 MB_BIC(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
 239                 /* Cut power from bay, release reset line */
 240                 MB_BIS(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
 241                 MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 242                 MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 243         }
 244         MB_BIC(bay, HEATHROW_MBCR, 0x00000F00);
 245 }
 246
 247 static void
 248 keylargo_mb_power(struct media_bay_info* bay, int on_off)
 249 {
 250         if (on_off) {
 251                 /* Power up device, assert it's reset line */
 252                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 253                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
 254         } else {
 255                 /* Disable all devices */
 256                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_MASK);
 257                 MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
 258                 /* Cut power from bay, release reset line */
 259                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
 260                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 261                 MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 262         }
 263         MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
 264 }
 265
 266 /*
 267  * Functions for configuring the media bay for a given type of device,
 268  * enable the related busses
 269  */
 270
 271 static int
 272 ohare_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 273 {
 274         switch(device_id) {
 275                 case MB_FD:
 276                 case MB_FD1:
 277                         MB_BIS(bay, OHARE_FCR, OH_BAY_FLOPPY_ENABLE);
 278                         MB_BIS(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
 279                         return 0;
 280                 case MB_CD:
 281                         MB_BIC(bay, OHARE_FCR, OH_IDE1_RESET_N);
 282                         MB_BIS(bay, OHARE_FCR, OH_BAY_IDE_ENABLE);
 283                         return 0;
 284                 case MB_PCI:
 285                         MB_BIS(bay, OHARE_FCR, OH_BAY_PCI_ENABLE);
 286                         return 0;
 287         }
 288         return -ENODEV;
 289 }
 290
 291 static int
 292 heathrow_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 293 {
 294         switch(device_id) {
 295                 case MB_FD:
 296                 case MB_FD1:
 297                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_FLOPPY_ENABLE);
 298                         MB_BIS(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
 299                         return 0;
 300                 case MB_CD:
 301                         MB_BIC(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 302                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_IDE_ENABLE);
 303                         return 0;
 304                 case MB_PCI:
 305                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_PCI_ENABLE);
 306                         return 0;
 307         }
 308         return -ENODEV;
 309 }
 310
 311 static int
 312 keylargo_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 313 {
 314         switch(device_id) {
 315                 case MB_CD:
 316                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_IDE_ENABLE);
 317                         MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 318                         MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
 319                         return 0;
 320                 case MB_PCI:
 321                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_PCI_ENABLE);
 322                         return 0;
 323                 case MB_SOUND:
 324                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_SOUND_ENABLE);
 325                         return 0;
 326         }
 327         return -ENODEV;
 328 }
 329
 330 /*
 331  * Functions for tweaking resets
 332  */
 333
 334 static void
 335 ohare_mb_un_reset(struct media_bay_info* bay)
 336 {
 337         MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
 338 }
 339
 340 static void keylargo_mb_init(struct media_bay_info *bay)
 341 {
 342         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
 343 }
 344
 345 static void heathrow_mb_un_reset(struct media_bay_info* bay)
 346 {
 347         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 348 }
 349
 350 static void keylargo_mb_un_reset(struct media_bay_info* bay)
 351 {
 352         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 353 }
 354
 355 static void ohare_mb_un_reset_ide(struct media_bay_info* bay)
 356 {
 357         MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
 358 }
 359
 360 static void heathrow_mb_un_reset_ide(struct media_bay_info* bay)
 361 {
 362         MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 363 }
 364
 365 static void keylargo_mb_un_reset_ide(struct media_bay_info* bay)
 366 {
 367         MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 368 }
 369
 370 static inline void set_mb_power(struct media_bay_info* bay, int onoff)
 371 {
 372         /* Power up up and assert the bay reset line */
 373         if (onoff) {
 374                 bay->ops->power(bay, 1);
 375                 bay->state = mb_powering_up;
 376                 MBDBG("mediabay%d: powering up\n", bay->index);
 377         } else {
 378                 /* Make sure everything is powered down & disabled */
 379                 bay->ops->power(bay, 0);
 380                 bay->state = mb_powering_down;
 381                 MBDBG("mediabay%d: powering down\n", bay->index);
 382         }
 383         bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
 384 }
 385
 386 static void poll_media_bay(struct media_bay_info* bay)
 387 {
 388         int id = bay->ops->content(bay);
 389
 390         if (id == bay->last_value) {
 391                 if (id != bay->content_id) {
 392                         bay->value_count += msecs_to_jiffies(MB_POLL_DELAY);
 393                         if (bay->value_count >= msecs_to_jiffies(MB_STABLE_DELAY)) {
 394                                 /* If the device type changes without going thru
 395                                  * "MB_NO", we force a pass by "MB_NO" to make sure
 396                                  * things are properly reset
 397                                  */
 398                                 if ((id != MB_NO) && (bay->content_id != MB_NO)) {
 399                                         id = MB_NO;
 400                                         MBDBG("mediabay%d: forcing MB_NO\n", bay->index);
 401                                 }
 402                                 MBDBG("mediabay%d: switching to %d\n", bay->index, id);
 403                                 set_mb_power(bay, id != MB_NO);
 404                                 bay->content_id = id;
 405                                 if (id == MB_NO) {
 406 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 407                                         bay->cd_retry = 0;
 408 #endif
 409                                         printk(KERN_INFO "media bay %d is empty\n", bay->index);
 410                                 }
 411                         }
 412                 }
 413         } else {
 414                 bay->last_value = id;
 415                 bay->value_count = 0;
 416         }
 417 }
 418
 419 #ifdef CONFIG_BLK_DEV_IDE_PMAC
 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 int check_media_bay_by_base(unsigned long base, int what)
 436 {
 437         int     i;
 438
 439         for (i=0; i<media_bay_count; i++)
 440                 if (media_bays[i].mdev && base == (unsigned long) media_bays[i].cd_base) {
 441                         if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up)
 442                                 return 0;
 443                         media_bays[i].cd_index = -1;
 444                         return -EINVAL;
 445                 }
 446
 447         return -ENODEV;
 448 }
 449 EXPORT_SYMBOL_GPL(check_media_bay_by_base);
 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                         mutex_lock(&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                                 mutex_unlock(&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                                         mutex_unlock(&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                         mutex_unlock(&bay->lock);
 483                         return -ENODEV;
 484                 }
 485         }
 486
 487         return -ENODEV;
 488 }
 489 EXPORT_SYMBOL_GPL(media_bay_set_ide_infos);
 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);