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