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/config.h>
  14 #include <linux/types.h>
  15 #include <linux/errno.h>
  16 #include <linux/kernel.h>
  17 #include <linux/delay.h>
  18 #include <linux/sched.h>
  19 #include <linux/timer.h>
  20 #include <linux/hdreg.h>
  21 #include <linux/stddef.h>
  22 #include <linux/init.h>
  23 #include <linux/ide.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 #define MB_IGNORE_SIGNALS
  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 semaphore                lock;
  82 #ifdef CONFIG_BLK_DEV_IDE
  83         void __iomem                    *cd_base;
  84         int                             cd_index;
  85         int                             cd_irq;
  86         int                             cd_retry;
  87 #endif
  88 };
  89
  90 #define MAX_BAYS        2
  91
  92 static struct media_bay_info media_bays[MAX_BAYS];
  93 int media_bay_count = 0;
  94
  95 #ifdef CONFIG_BLK_DEV_IDE
  96 /* check the busy bit in the media-bay ide interface
  97    (assumes the media-bay contains an ide device) */
  98 #define MB_IDE_READY(i) ((readb(media_bays[i].cd_base + 0x70) & 0x80) == 0)
  99 #endif
 100
 101 /*
 102  * Wait that number of ms between each step in normal polling mode
 103  */
 104 #define MB_POLL_DELAY   25
 105
 106 /*
 107  * Consider the media-bay ID value stable if it is the same for
 108  * this number of milliseconds
 109  */
 110 #define MB_STABLE_DELAY 100
 111
 112 /* Wait after powering up the media bay this delay in ms
 113  * timeout bumped for some powerbooks
 114  */
 115 #define MB_POWER_DELAY  200
 116
 117 /*
 118  * Hold the media-bay reset signal true for this many ticks
 119  * after a device is inserted before releasing it.
 120  */
 121 #define MB_RESET_DELAY  50
 122
 123 /*
 124  * Wait this long after the reset signal is released and before doing
 125  * further operations. After this delay, the IDE reset signal is released
 126  * too for an IDE device
 127  */
 128 #define MB_SETUP_DELAY  100
 129
 130 /*
 131  * Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted
 132  * (or until the device is ready) before waiting for busy bit to disappear
 133  */
 134 #define MB_IDE_WAIT     1000
 135
 136 /*
 137  * Timeout waiting for busy bit of an IDE device to go down
 138  */
 139 #define MB_IDE_TIMEOUT  5000
 140
 141 /*
 142  * Max retries of the full power up/down sequence for an IDE device
 143  */
 144 #define MAX_CD_RETRIES  3
 145
 146 /*
 147  * States of a media bay
 148  */
 149 enum {
 150         mb_empty = 0,           /* Idle */
 151         mb_powering_up,         /* power bit set, waiting MB_POWER_DELAY */
 152         mb_enabling_bay,        /* enable bits set, waiting MB_RESET_DELAY */
 153         mb_resetting,           /* reset bit unset, waiting MB_SETUP_DELAY */
 154         mb_ide_resetting,       /* IDE reset bit unser, waiting MB_IDE_WAIT */
 155         mb_ide_waiting,         /* Waiting for BUSY bit to go away until MB_IDE_TIMEOUT */
 156         mb_up,                  /* Media bay full */
 157         mb_powering_down        /* Powering down (avoid too fast down/up) */
 158 };
 159
 160 #define MB_POWER_SOUND          0x08
 161 #define MB_POWER_FLOPPY         0x04
 162 #define MB_POWER_ATA            0x02
 163 #define MB_POWER_PCI            0x01
 164 #define MB_POWER_OFF            0x00
 165
 166 /*
 167  * Functions for polling content of media bay
 168  */
 169
 170 static u8
 171 ohare_mb_content(struct media_bay_info *bay)
 172 {
 173         return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
 174 }
 175
 176 static u8
 177 heathrow_mb_content(struct media_bay_info *bay)
 178 {
 179         return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
 180 }
 181
 182 static u8
 183 keylargo_mb_content(struct media_bay_info *bay)
 184 {
 185         int new_gpio;
 186
 187         new_gpio = MB_IN8(bay, KL_GPIO_MEDIABAY_IRQ) & KEYLARGO_GPIO_INPUT_DATA;
 188         if (new_gpio) {
 189                 bay->cached_gpio = new_gpio;
 190                 return MB_NO;
 191         } else if (bay->cached_gpio != new_gpio) {
 192                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
 193                 (void)MB_IN32(bay, KEYLARGO_MBCR);
 194                 udelay(5);
 195                 MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
 196                 (void)MB_IN32(bay, KEYLARGO_MBCR);
 197                 udelay(5);
 198                 bay->cached_gpio = new_gpio;
 199         }
 200         return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7;
 201 }
 202
 203 /*
 204  * Functions for powering up/down the bay, puts the bay device
 205  * into reset state as well
 206  */
 207
 208 static void
 209 ohare_mb_power(struct media_bay_info* bay, int on_off)
 210 {
 211         if (on_off) {
 212                 /* Power up device, assert it's reset line */
 213                 MB_BIC(bay, OHARE_FCR, OH_BAY_RESET_N);
 214                 MB_BIC(bay, OHARE_FCR, OH_BAY_POWER_N);
 215         } else {
 216                 /* Disable all devices */
 217                 MB_BIC(bay, OHARE_FCR, OH_BAY_DEV_MASK);
 218                 MB_BIC(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
 219                 /* Cut power from bay, release reset line */
 220                 MB_BIS(bay, OHARE_FCR, OH_BAY_POWER_N);
 221                 MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
 222                 MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
 223         }
 224         MB_BIC(bay, OHARE_MBCR, 0x00000F00);
 225 }
 226
 227 static void
 228 heathrow_mb_power(struct media_bay_info* bay, int on_off)
 229 {
 230         if (on_off) {
 231                 /* Power up device, assert it's reset line */
 232                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 233                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
 234         } else {
 235                 /* Disable all devices */
 236                 MB_BIC(bay, HEATHROW_FCR, HRW_BAY_DEV_MASK);
 237                 MB_BIC(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
 238                 /* Cut power from bay, release reset line */
 239                 MB_BIS(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
 240                 MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 241                 MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 242         }
 243         MB_BIC(bay, HEATHROW_MBCR, 0x00000F00);
 244 }
 245
 246 static void
 247 keylargo_mb_power(struct media_bay_info* bay, int on_off)
 248 {
 249         if (on_off) {
 250                 /* Power up device, assert it's reset line */
 251                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 252                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
 253         } else {
 254                 /* Disable all devices */
 255                 MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_MASK);
 256                 MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
 257                 /* Cut power from bay, release reset line */
 258                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
 259                 MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 260                 MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 261         }
 262         MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
 263 }
 264
 265 /*
 266  * Functions for configuring the media bay for a given type of device,
 267  * enable the related busses
 268  */
 269
 270 static int
 271 ohare_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 272 {
 273         switch(device_id) {
 274                 case MB_FD:
 275                 case MB_FD1:
 276                         MB_BIS(bay, OHARE_FCR, OH_BAY_FLOPPY_ENABLE);
 277                         MB_BIS(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
 278                         return 0;
 279                 case MB_CD:
 280                         MB_BIC(bay, OHARE_FCR, OH_IDE1_RESET_N);
 281                         MB_BIS(bay, OHARE_FCR, OH_BAY_IDE_ENABLE);
 282                         return 0;
 283                 case MB_PCI:
 284                         MB_BIS(bay, OHARE_FCR, OH_BAY_PCI_ENABLE);
 285                         return 0;
 286         }
 287         return -ENODEV;
 288 }
 289
 290 static int
 291 heathrow_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 292 {
 293         switch(device_id) {
 294                 case MB_FD:
 295                 case MB_FD1:
 296                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_FLOPPY_ENABLE);
 297                         MB_BIS(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
 298                         return 0;
 299                 case MB_CD:
 300                         MB_BIC(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 301                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_IDE_ENABLE);
 302                         return 0;
 303                 case MB_PCI:
 304                         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_PCI_ENABLE);
 305                         return 0;
 306         }
 307         return -ENODEV;
 308 }
 309
 310 static int
 311 keylargo_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
 312 {
 313         switch(device_id) {
 314                 case MB_CD:
 315                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_IDE_ENABLE);
 316                         MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 317                         MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
 318                         return 0;
 319                 case MB_PCI:
 320                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_PCI_ENABLE);
 321                         return 0;
 322                 case MB_SOUND:
 323                         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_SOUND_ENABLE);
 324                         return 0;
 325         }
 326         return -ENODEV;
 327 }
 328
 329 /*
 330  * Functions for tweaking resets
 331  */
 332
 333 static void
 334 ohare_mb_un_reset(struct media_bay_info* bay)
 335 {
 336         MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
 337 }
 338
 339 static void keylargo_mb_init(struct media_bay_info *bay)
 340 {
 341         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
 342 }
 343
 344 static void heathrow_mb_un_reset(struct media_bay_info* bay)
 345 {
 346         MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
 347 }
 348
 349 static void keylargo_mb_un_reset(struct media_bay_info* bay)
 350 {
 351         MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
 352 }
 353
 354 static void ohare_mb_un_reset_ide(struct media_bay_info* bay)
 355 {
 356         MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
 357 }
 358
 359 static void heathrow_mb_un_reset_ide(struct media_bay_info* bay)
 360 {
 361         MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
 362 }
 363
 364 static void keylargo_mb_un_reset_ide(struct media_bay_info* bay)
 365 {
 366         MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
 367 }
 368
 369 static inline void set_mb_power(struct media_bay_info* bay, int onoff)
 370 {
 371         /* Power up up and assert the bay reset line */
 372         if (onoff) {
 373                 bay->ops->power(bay, 1);
 374                 bay->state = mb_powering_up;
 375                 MBDBG("mediabay%d: powering up\n", bay->index);
 376         } else {
 377                 /* Make sure everything is powered down & disabled */
 378                 bay->ops->power(bay, 0);
 379                 bay->state = mb_powering_down;
 380                 MBDBG("mediabay%d: powering down\n", bay->index);
 381         }
 382         bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
 383 }
 384
 385 static void poll_media_bay(struct media_bay_info* bay)
 386 {
 387         int id = bay->ops->content(bay);
 388
 389         if (id == bay->last_value) {
 390                 if (id != bay->content_id) {
 391                         bay->value_count += msecs_to_jiffies(MB_POLL_DELAY);
 392                         if (bay->value_count >= msecs_to_jiffies(MB_STABLE_DELAY)) {
 393                                 /* If the device type changes without going thru
 394                                  * "MB_NO", we force a pass by "MB_NO" to make sure
 395                                  * things are properly reset
 396                                  */
 397                                 if ((id != MB_NO) && (bay->content_id != MB_NO)) {
 398                                         id = MB_NO;
 399                                         MBDBG("mediabay%d: forcing MB_NO\n", bay->index);
 400                                 }
 401                                 MBDBG("mediabay%d: switching to %d\n", bay->index, id);
 402                                 set_mb_power(bay, id != MB_NO);
 403                                 bay->content_id = id;
 404                                 if (id == MB_NO) {
 405 #ifdef CONFIG_BLK_DEV_IDE
 406                                         bay->cd_retry = 0;
 407 #endif
 408                                         printk(KERN_INFO "media bay %d is empty\n", bay->index);
 409                                 }
 410                         }
 411                 }
 412         } else {
 413                 bay->last_value = id;
 414                 bay->value_count = 0;
 415         }
 416 }
 417
 418 int check_media_bay(struct device_node *which_bay, int what)
 419 {
 420 #ifdef CONFIG_BLK_DEV_IDE
 421         int     i;
 422
 423         for (i=0; i<media_bay_count; i++)
 424                 if (media_bays[i].mdev && which_bay == media_bays[i].mdev->ofdev.node) {
 425                         if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up)
 426                                 return 0;
 427                         media_bays[i].cd_index = -1;
 428                         return -EINVAL;
 429                 }
 430 #endif /* CONFIG_BLK_DEV_IDE */
 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 #ifdef CONFIG_BLK_DEV_IDE
 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 #endif
 448
 449         return -ENODEV;
 450 }
 451
 452 int media_bay_set_ide_infos(struct device_node* which_bay, unsigned long base,
 453         int irq, int index)
 454 {
 455 #ifdef CONFIG_BLK_DEV_IDE
 456         int     i;
 457
 458         for (i=0; i<media_bay_count; i++) {
 459                 struct media_bay_info* bay = &media_bays[i];
 460
 461                 if (bay->mdev && which_bay == bay->mdev->ofdev.node) {
 462                         int timeout = 5000;
 463
 464                         down(&bay->lock);
 465
 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                                 up(&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                                         up(&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                         up(&bay->lock);
 484                         return -ENODEV;
 485                 }
 486         }
 487 #endif /* CONFIG_BLK_DEV_IDE */
 488
 489         return -ENODEV;
 490 }
 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
 526         case mb_resetting:
 527                 if (bay->content_id != MB_CD) {
 528                         MBDBG("mediabay%d: bay is up (kind:%d)\n", i, bay->content_id);
 529                         bay->state = mb_up;
 530                         break;
 531                 }
 532 #ifdef CONFIG_BLK_DEV_IDE
 533                 MBDBG("mediabay%d: waiting IDE reset (kind:%d)\n", i, bay->content_id);
 534                 bay->ops->un_reset_ide(bay);
 535                 bay->timer = msecs_to_jiffies(MB_IDE_WAIT);
 536                 bay->state = mb_ide_resetting;
 537 #else
 538                 printk(KERN_DEBUG "media-bay %d is ide (not compiled in kernel)\n", i);
 539                 set_mb_power(bay, 0);
 540 #endif /* CONFIG_BLK_DEV_IDE */
 541                 break;
 542
 543 #ifdef CONFIG_BLK_DEV_IDE
 544         case mb_ide_resetting:
 545                 bay->timer = msecs_to_jiffies(MB_IDE_TIMEOUT);
 546                 bay->state = mb_ide_waiting;
 547                 MBDBG("mediabay%d: waiting IDE ready (kind:%d)\n", i, bay->content_id);
 548                 break;
 549
 550         case mb_ide_waiting:
 551                 if (bay->cd_base == NULL) {
 552                         bay->timer = 0;
 553                         bay->state = mb_up;
 554                         MBDBG("mediabay%d: up before IDE init\n", i);
 555                         break;
 556                 } else if (MB_IDE_READY(i)) {
 557                         bay->timer = 0;
 558                         bay->state = mb_up;
 559                         if (bay->cd_index < 0) {
 560                                 hw_regs_t hw;
 561
 562                                 printk("mediabay %d, registering IDE...\n", i);
 563                                 pmu_suspend();
 564                                 ide_init_hwif_ports(&hw, (unsigned long) bay->cd_base, (unsigned long) 0, NULL);
 565                                 hw.irq = bay->cd_irq;
 566                                 hw.chipset = ide_pmac;
 567                                 bay->cd_index = ide_register_hw(&hw, NULL);
 568                                 pmu_resume();
 569                         }
 570                         if (bay->cd_index == -1) {
 571                                 /* We eventually do a retry */
 572                                 bay->cd_retry++;
 573                                 printk("IDE register error\n");
 574                                 set_mb_power(bay, 0);
 575                         } else {
 576                                 printk(KERN_DEBUG "media-bay %d is ide%d\n", i, bay->cd_index);
 577                                 MBDBG("mediabay %d IDE ready\n", i);
 578                         }
 579                         break;
 580                 } else if (bay->timer > 0)
 581                         bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
 582                 if (bay->timer <= 0) {
 583                         printk("\nIDE Timeout in bay %d !, IDE state is: 0x%02x\n",
 584                                i, readb(bay->cd_base + 0x70));
 585                         MBDBG("mediabay%d: nIDE Timeout !\n", i);
 586                         set_mb_power(bay, 0);
 587                         bay->timer = 0;
 588                 }
 589                 break;
 590 #endif /* CONFIG_BLK_DEV_IDE */
 591
 592         case mb_powering_down:
 593                 bay->state = mb_empty;
 594 #ifdef CONFIG_BLK_DEV_IDE
 595                 if (bay->cd_index >= 0) {
 596                         printk(KERN_DEBUG "Unregistering mb %d ide, index:%d\n", i,
 597                                bay->cd_index);
 598                         ide_unregister(bay->cd_index);
 599                         bay->cd_index = -1;
 600                 }
 601                 if (bay->cd_retry) {
 602                         if (bay->cd_retry > MAX_CD_RETRIES) {
 603                                 /* Should add an error sound (sort of beep in dmasound) */
 604                                 printk("\nmedia-bay %d, IDE device badly inserted or unrecognised\n", i);
 605                         } else {
 606                                 /* Force a new power down/up sequence */
 607                                 bay->content_id = MB_NO;
 608                         }
 609                 }
 610 #endif /* CONFIG_BLK_DEV_IDE */
 611                 MBDBG("mediabay%d: end of power down\n", i);
 612                 break;
 613         }
 614 }
 615
 616 /*
 617  * This procedure runs as a kernel thread to poll the media bay
 618  * once each tick and register and unregister the IDE interface
 619  * with the IDE driver.  It needs to be a thread because
 620  * ide_register can't be called from interrupt context.
 621  */
 622 static int media_bay_task(void *x)
 623 {
 624         int     i;
 625
 626         strcpy(current->comm, "media-bay");
 627 #ifdef MB_IGNORE_SIGNALS
 628         sigfillset(&current->blocked);
 629 #endif
 630
 631         for (;;) {
 632                 for (i = 0; i < media_bay_count; ++i) {
 633                         down(&media_bays[i].lock);
 634                         if (!media_bays[i].sleeping)
 635                                 media_bay_step(i);
 636                         up(&media_bays[i].lock);
 637                 }
 638
 639                 msleep_interruptible(MB_POLL_DELAY);
 640                 if (signal_pending(current))
 641                         return 0;
 642         }
 643 }
 644
 645 static int __devinit media_bay_attach(struct macio_dev *mdev, const struct of_device_id *match)
 646 {
 647         struct media_bay_info* bay;
 648         u32 __iomem *regbase;
 649         struct device_node *ofnode;
 650         unsigned long base;
 651         int i;
 652
 653         ofnode = mdev->ofdev.node;
 654
 655         if (macio_resource_count(mdev) < 1)
 656                 return -ENODEV;
 657         if (macio_request_resources(mdev, "media-bay"))
 658                 return -EBUSY;
 659         /* Media bay registers are located at the beginning of the
 660          * mac-io chip, for now, we trick and align down the first
 661          * resource passed in
 662          */
 663         base = macio_resource_start(mdev, 0) & 0xffff0000u;
 664         regbase = (u32 __iomem *)ioremap(base, 0x100);
 665         if (regbase == NULL) {
 666                 macio_release_resources(mdev);
 667                 return -ENOMEM;
 668         }
 669
 670         i = media_bay_count++;
 671         bay = &media_bays[i];
 672         bay->mdev = mdev;
 673         bay->base = regbase;
 674         bay->index = i;
 675         bay->ops = match->data;
 676         bay->sleeping = 0;
 677         init_MUTEX(&bay->lock);
 678
 679         /* Init HW probing */
 680         if (bay->ops->init)
 681                 bay->ops->init(bay);
 682
 683         printk(KERN_INFO "mediabay%d: Registered %s media-bay\n", i, bay->ops->name);
 684
 685         /* Force an immediate detect */
 686         set_mb_power(bay, 0);
 687         msleep(MB_POWER_DELAY);
 688         bay->content_id = MB_NO;
 689         bay->last_value = bay->ops->content(bay);
 690         bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
 691         bay->state = mb_empty;
 692         do {
 693                 msleep(MB_POLL_DELAY);
 694                 media_bay_step(i);
 695         } while((bay->state != mb_empty) &&
 696                 (bay->state != mb_up));
 697
 698         /* Mark us ready by filling our mdev data */
 699         macio_set_drvdata(mdev, bay);
 700
 701         /* Startup kernel thread */
 702         if (i == 0)
 703                 kernel_thread(media_bay_task, NULL, CLONE_KERNEL);
 704
 705         return 0;
 706
 707 }
 708
 709 static int media_bay_suspend(struct macio_dev *mdev, pm_message_t state)
 710 {
 711         struct media_bay_info   *bay = macio_get_drvdata(mdev);
 712
 713         if (state.event != mdev->ofdev.dev.power.power_state.event && state.event == PM_EVENT_SUSPEND) {
 714                 down(&bay->lock);
 715                 bay->sleeping = 1;
 716                 set_mb_power(bay, 0);
 717                 up(&bay->lock);
 718                 msleep(MB_POLL_DELAY);
 719                 mdev->ofdev.dev.power.power_state = state;
 720         }
 721         return 0;
 722 }
 723
 724 static int media_bay_resume(struct macio_dev *mdev)
 725 {
 726         struct media_bay_info   *bay = macio_get_drvdata(mdev);
 727
 728         if (mdev->ofdev.dev.power.power_state.event != PM_EVENT_ON) {
 729                 mdev->ofdev.dev.power.power_state = PMSG_ON;
 730
 731                 /* We re-enable the bay using it's previous content
 732                    only if it did not change. Note those bozo timings,
 733                    they seem to help the 3400 get it right.
 734                  */
 735                 /* Force MB power to 0 */
 736                 down(&bay->lock);
 737                 set_mb_power(bay, 0);
 738                 msleep(MB_POWER_DELAY);
 739                 if (bay->ops->content(bay) != bay->content_id) {
 740                         printk("mediabay%d: content changed during sleep...\n", bay->index);
 741                         up(&bay->lock);
 742                         return 0;
 743                 }
 744                 set_mb_power(bay, 1);
 745                 bay->last_value = bay->content_id;
 746                 bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
 747                 bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
 748 #ifdef CONFIG_BLK_DEV_IDE
 749                 bay->cd_retry = 0;
 750 #endif
 751                 do {
 752                         msleep(MB_POLL_DELAY);
 753                         media_bay_step(bay->index);
 754                 } while((bay->state != mb_empty) &&
 755                         (bay->state != mb_up));
 756                 bay->sleeping = 0;
 757                 up(&bay->lock);
 758         }
 759         return 0;
 760 }
 761
 762
 763 /* Definitions of "ops" structures.
 764  */
 765 static struct mb_ops ohare_mb_ops = {
 766         .name           = "Ohare",
 767         .content        = ohare_mb_content,
 768         .power          = ohare_mb_power,
 769         .setup_bus      = ohare_mb_setup_bus,
 770         .un_reset       = ohare_mb_un_reset,
 771         .un_reset_ide   = ohare_mb_un_reset_ide,
 772 };
 773
 774 static struct mb_ops heathrow_mb_ops = {
 775         .name           = "Heathrow",
 776         .content        = heathrow_mb_content,
 777         .power          = heathrow_mb_power,
 778         .setup_bus      = heathrow_mb_setup_bus,
 779         .un_reset       = heathrow_mb_un_reset,
 780         .un_reset_ide   = heathrow_mb_un_reset_ide,
 781 };
 782
 783 static struct mb_ops keylargo_mb_ops = {
 784         .name           = "KeyLargo",
 785         .init           = keylargo_mb_init,
 786         .content        = keylargo_mb_content,
 787         .power          = keylargo_mb_power,
 788         .setup_bus      = keylargo_mb_setup_bus,
 789         .un_reset       = keylargo_mb_un_reset,
 790         .un_reset_ide   = keylargo_mb_un_reset_ide,
 791 };
 792
 793 /*
 794  * It seems that the bit for the media-bay interrupt in the IRQ_LEVEL
 795  * register is always set when there is something in the media bay.
 796  * This causes problems for the interrupt code if we attach an interrupt
 797  * handler to the media-bay interrupt, because it tends to go into
 798  * an infinite loop calling the media bay interrupt handler.
 799  * Therefore we do it all by polling the media bay once each tick.
 800  */
 801
 802 static struct of_device_id media_bay_match[] =
 803 {
 804         {
 805         .name           = "media-bay",
 806         .compatible     = "keylargo-media-bay",
 807         .data           = &keylargo_mb_ops,
 808         },
 809         {
 810         .name           = "media-bay",
 811         .compatible     = "heathrow-media-bay",
 812         .data           = &heathrow_mb_ops,
 813         },
 814         {
 815         .name           = "media-bay",
 816         .compatible     = "ohare-media-bay",
 817         .data           = &ohare_mb_ops,
 818         },
 819         {},
 820 };
 821
 822 static struct macio_driver media_bay_driver =
 823 {
 824         .name           = "media-bay",
 825         .match_table    = media_bay_match,
 826         .probe          = media_bay_attach,
 827         .suspend        = media_bay_suspend,
 828         .resume         = media_bay_resume
 829 };
 830
 831 static int __init media_bay_init(void)
 832 {
 833         int i;
 834
 835         for (i=0; i<MAX_BAYS; i++) {
 836                 memset((char *)&media_bays[i], 0, sizeof(struct media_bay_info));
 837                 media_bays[i].content_id        = -1;
 838 #ifdef CONFIG_BLK_DEV_IDE
 839                 media_bays[i].cd_index          = -1;
 840 #endif
 841         }
 842         if (_machine != _MACH_Pmac)
 843                 return -ENODEV;
 844
 845         macio_register_driver(&media_bay_driver);
 846
 847         return 0;
 848 }
 849
 850 device_initcall(media_bay_init);