758 lines
19 KiB
C
Executable file
758 lines
19 KiB
C
Executable file
/*
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* Driver for the media bay on the PowerBook 3400 and 2400.
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*
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* Copyright (C) 1998 Paul Mackerras.
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*
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* Various evolutions by Benjamin Herrenschmidt & Henry Worth
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/stddef.h>
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#include <linux/init.h>
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#include <linux/kthread.h>
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#include <linux/mutex.h>
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#include <asm/prom.h>
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#include <asm/pgtable.h>
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#include <asm/io.h>
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#include <asm/machdep.h>
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#include <asm/pmac_feature.h>
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#include <asm/mediabay.h>
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#include <asm/sections.h>
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#include <asm/ohare.h>
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#include <asm/heathrow.h>
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#include <asm/keylargo.h>
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#include <linux/adb.h>
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#include <linux/pmu.h>
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#define MB_FCR32(bay, r) ((bay)->base + ((r) >> 2))
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#define MB_FCR8(bay, r) (((volatile u8 __iomem *)((bay)->base)) + (r))
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#define MB_IN32(bay,r) (in_le32(MB_FCR32(bay,r)))
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#define MB_OUT32(bay,r,v) (out_le32(MB_FCR32(bay,r), (v)))
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#define MB_BIS(bay,r,v) (MB_OUT32((bay), (r), MB_IN32((bay), r) | (v)))
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#define MB_BIC(bay,r,v) (MB_OUT32((bay), (r), MB_IN32((bay), r) & ~(v)))
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#define MB_IN8(bay,r) (in_8(MB_FCR8(bay,r)))
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#define MB_OUT8(bay,r,v) (out_8(MB_FCR8(bay,r), (v)))
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struct media_bay_info;
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struct mb_ops {
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char* name;
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void (*init)(struct media_bay_info *bay);
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u8 (*content)(struct media_bay_info *bay);
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void (*power)(struct media_bay_info *bay, int on_off);
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int (*setup_bus)(struct media_bay_info *bay, u8 device_id);
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void (*un_reset)(struct media_bay_info *bay);
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void (*un_reset_ide)(struct media_bay_info *bay);
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};
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struct media_bay_info {
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u32 __iomem *base;
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int content_id;
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int state;
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int last_value;
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int value_count;
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int timer;
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struct macio_dev *mdev;
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const struct mb_ops* ops;
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int index;
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int cached_gpio;
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int sleeping;
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int user_lock;
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struct mutex lock;
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};
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#define MAX_BAYS 2
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static struct media_bay_info media_bays[MAX_BAYS];
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static int media_bay_count = 0;
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/*
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* Wait that number of ms between each step in normal polling mode
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*/
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#define MB_POLL_DELAY 25
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/*
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* Consider the media-bay ID value stable if it is the same for
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* this number of milliseconds
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*/
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#define MB_STABLE_DELAY 100
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/* Wait after powering up the media bay this delay in ms
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* timeout bumped for some powerbooks
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*/
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#define MB_POWER_DELAY 200
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/*
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* Hold the media-bay reset signal true for this many ticks
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* after a device is inserted before releasing it.
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*/
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#define MB_RESET_DELAY 50
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/*
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* Wait this long after the reset signal is released and before doing
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* further operations. After this delay, the IDE reset signal is released
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* too for an IDE device
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*/
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#define MB_SETUP_DELAY 100
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/*
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* Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted
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* (or until the device is ready) before calling into the driver
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*/
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#define MB_IDE_WAIT 1000
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/*
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* States of a media bay
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*/
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enum {
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mb_empty = 0, /* Idle */
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mb_powering_up, /* power bit set, waiting MB_POWER_DELAY */
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mb_enabling_bay, /* enable bits set, waiting MB_RESET_DELAY */
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mb_resetting, /* reset bit unset, waiting MB_SETUP_DELAY */
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mb_ide_resetting, /* IDE reset bit unser, waiting MB_IDE_WAIT */
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mb_up, /* Media bay full */
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mb_powering_down /* Powering down (avoid too fast down/up) */
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};
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#define MB_POWER_SOUND 0x08
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#define MB_POWER_FLOPPY 0x04
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#define MB_POWER_ATA 0x02
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#define MB_POWER_PCI 0x01
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#define MB_POWER_OFF 0x00
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/*
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* Functions for polling content of media bay
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*/
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static u8
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ohare_mb_content(struct media_bay_info *bay)
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{
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return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
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}
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static u8
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heathrow_mb_content(struct media_bay_info *bay)
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{
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return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
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}
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static u8
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keylargo_mb_content(struct media_bay_info *bay)
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{
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int new_gpio;
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new_gpio = MB_IN8(bay, KL_GPIO_MEDIABAY_IRQ) & KEYLARGO_GPIO_INPUT_DATA;
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if (new_gpio) {
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bay->cached_gpio = new_gpio;
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return MB_NO;
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} else if (bay->cached_gpio != new_gpio) {
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MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
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(void)MB_IN32(bay, KEYLARGO_MBCR);
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udelay(5);
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MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
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(void)MB_IN32(bay, KEYLARGO_MBCR);
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udelay(5);
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bay->cached_gpio = new_gpio;
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}
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return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7;
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}
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/*
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* Functions for powering up/down the bay, puts the bay device
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* into reset state as well
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*/
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static void
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ohare_mb_power(struct media_bay_info* bay, int on_off)
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{
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if (on_off) {
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/* Power up device, assert it's reset line */
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MB_BIC(bay, OHARE_FCR, OH_BAY_RESET_N);
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MB_BIC(bay, OHARE_FCR, OH_BAY_POWER_N);
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} else {
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/* Disable all devices */
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MB_BIC(bay, OHARE_FCR, OH_BAY_DEV_MASK);
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MB_BIC(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
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/* Cut power from bay, release reset line */
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MB_BIS(bay, OHARE_FCR, OH_BAY_POWER_N);
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MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
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MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
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}
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MB_BIC(bay, OHARE_MBCR, 0x00000F00);
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}
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static void
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heathrow_mb_power(struct media_bay_info* bay, int on_off)
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{
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if (on_off) {
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/* Power up device, assert it's reset line */
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MB_BIC(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
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MB_BIC(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
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} else {
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/* Disable all devices */
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MB_BIC(bay, HEATHROW_FCR, HRW_BAY_DEV_MASK);
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MB_BIC(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
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/* Cut power from bay, release reset line */
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MB_BIS(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
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MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
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MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
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}
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MB_BIC(bay, HEATHROW_MBCR, 0x00000F00);
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}
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static void
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keylargo_mb_power(struct media_bay_info* bay, int on_off)
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{
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if (on_off) {
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/* Power up device, assert it's reset line */
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MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
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MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
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} else {
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/* Disable all devices */
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MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_MASK);
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MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
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/* Cut power from bay, release reset line */
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MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
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MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
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MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
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}
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MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
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}
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/*
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* Functions for configuring the media bay for a given type of device,
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* enable the related busses
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*/
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static int
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ohare_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
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{
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switch(device_id) {
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case MB_FD:
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case MB_FD1:
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MB_BIS(bay, OHARE_FCR, OH_BAY_FLOPPY_ENABLE);
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MB_BIS(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
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return 0;
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case MB_CD:
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MB_BIC(bay, OHARE_FCR, OH_IDE1_RESET_N);
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MB_BIS(bay, OHARE_FCR, OH_BAY_IDE_ENABLE);
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return 0;
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case MB_PCI:
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MB_BIS(bay, OHARE_FCR, OH_BAY_PCI_ENABLE);
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return 0;
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}
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return -ENODEV;
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}
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static int
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heathrow_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
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{
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switch(device_id) {
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case MB_FD:
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case MB_FD1:
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MB_BIS(bay, HEATHROW_FCR, HRW_BAY_FLOPPY_ENABLE);
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MB_BIS(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
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return 0;
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case MB_CD:
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MB_BIC(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
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MB_BIS(bay, HEATHROW_FCR, HRW_BAY_IDE_ENABLE);
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return 0;
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case MB_PCI:
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MB_BIS(bay, HEATHROW_FCR, HRW_BAY_PCI_ENABLE);
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return 0;
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}
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return -ENODEV;
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}
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static int
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keylargo_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
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{
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switch(device_id) {
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case MB_CD:
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MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_IDE_ENABLE);
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MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
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MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
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return 0;
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case MB_PCI:
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MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_PCI_ENABLE);
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return 0;
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case MB_SOUND:
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MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_SOUND_ENABLE);
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return 0;
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}
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return -ENODEV;
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}
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/*
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* Functions for tweaking resets
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*/
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static void
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ohare_mb_un_reset(struct media_bay_info* bay)
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{
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MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
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}
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static void keylargo_mb_init(struct media_bay_info *bay)
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{
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MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
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}
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static void heathrow_mb_un_reset(struct media_bay_info* bay)
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{
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MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
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}
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static void keylargo_mb_un_reset(struct media_bay_info* bay)
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{
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MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
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}
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static void ohare_mb_un_reset_ide(struct media_bay_info* bay)
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{
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MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
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}
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static void heathrow_mb_un_reset_ide(struct media_bay_info* bay)
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{
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MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
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}
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static void keylargo_mb_un_reset_ide(struct media_bay_info* bay)
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{
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MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
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}
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static inline void set_mb_power(struct media_bay_info* bay, int onoff)
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{
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/* Power up up and assert the bay reset line */
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if (onoff) {
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bay->ops->power(bay, 1);
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bay->state = mb_powering_up;
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pr_debug("mediabay%d: powering up\n", bay->index);
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} else {
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/* Make sure everything is powered down & disabled */
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bay->ops->power(bay, 0);
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bay->state = mb_powering_down;
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pr_debug("mediabay%d: powering down\n", bay->index);
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}
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bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
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}
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static void poll_media_bay(struct media_bay_info* bay)
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{
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int id = bay->ops->content(bay);
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static char *mb_content_types[] = {
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"a floppy drive",
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"a floppy drive",
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"an unsupported audio device",
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"an ATA device",
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"an unsupported PCI device",
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"an unknown device",
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};
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if (id != bay->last_value) {
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bay->last_value = id;
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bay->value_count = 0;
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return;
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}
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if (id == bay->content_id)
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return;
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bay->value_count += msecs_to_jiffies(MB_POLL_DELAY);
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if (bay->value_count >= msecs_to_jiffies(MB_STABLE_DELAY)) {
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/* If the device type changes without going thru
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* "MB_NO", we force a pass by "MB_NO" to make sure
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* things are properly reset
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*/
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if ((id != MB_NO) && (bay->content_id != MB_NO)) {
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id = MB_NO;
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pr_debug("mediabay%d: forcing MB_NO\n", bay->index);
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}
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pr_debug("mediabay%d: switching to %d\n", bay->index, id);
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set_mb_power(bay, id != MB_NO);
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bay->content_id = id;
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if (id >= MB_NO || id < 0)
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printk(KERN_INFO "mediabay%d: Bay is now empty\n", bay->index);
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else
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printk(KERN_INFO "mediabay%d: Bay contains %s\n",
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bay->index, mb_content_types[id]);
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}
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}
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int check_media_bay(struct macio_dev *baydev)
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{
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struct media_bay_info* bay;
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int id;
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if (baydev == NULL)
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return MB_NO;
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/* This returns an instant snapshot, not locking, sine
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* we may be called with the bay lock held. The resulting
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* fuzzyness of the result if called at the wrong time is
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* not actually a huge deal
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*/
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bay = macio_get_drvdata(baydev);
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if (bay == NULL)
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return MB_NO;
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id = bay->content_id;
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if (bay->state != mb_up)
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return MB_NO;
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if (id == MB_FD1)
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return MB_FD;
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return id;
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}
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EXPORT_SYMBOL_GPL(check_media_bay);
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void lock_media_bay(struct macio_dev *baydev)
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{
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struct media_bay_info* bay;
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if (baydev == NULL)
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return;
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bay = macio_get_drvdata(baydev);
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if (bay == NULL)
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return;
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mutex_lock(&bay->lock);
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bay->user_lock = 1;
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}
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EXPORT_SYMBOL_GPL(lock_media_bay);
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void unlock_media_bay(struct macio_dev *baydev)
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{
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struct media_bay_info* bay;
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if (baydev == NULL)
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return;
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bay = macio_get_drvdata(baydev);
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if (bay == NULL)
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return;
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if (bay->user_lock) {
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bay->user_lock = 0;
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mutex_unlock(&bay->lock);
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}
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}
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EXPORT_SYMBOL_GPL(unlock_media_bay);
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static int mb_broadcast_hotplug(struct device *dev, void *data)
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{
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struct media_bay_info* bay = data;
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struct macio_dev *mdev;
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struct macio_driver *drv;
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int state;
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if (dev->bus != &macio_bus_type)
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return 0;
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state = bay->state == mb_up ? bay->content_id : MB_NO;
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if (state == MB_FD1)
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state = MB_FD;
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mdev = to_macio_device(dev);
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drv = to_macio_driver(dev->driver);
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if (dev->driver && drv->mediabay_event)
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drv->mediabay_event(mdev, state);
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return 0;
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}
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static void media_bay_step(int i)
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{
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struct media_bay_info* bay = &media_bays[i];
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/* We don't poll when powering down */
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if (bay->state != mb_powering_down)
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poll_media_bay(bay);
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/* If timer expired run state machine */
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if (bay->timer != 0) {
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bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
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if (bay->timer > 0)
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return;
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bay->timer = 0;
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}
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switch(bay->state) {
|
|
case mb_powering_up:
|
|
if (bay->ops->setup_bus(bay, bay->last_value) < 0) {
|
|
pr_debug("mediabay%d: device not supported (kind:%d)\n",
|
|
i, bay->content_id);
|
|
set_mb_power(bay, 0);
|
|
break;
|
|
}
|
|
bay->timer = msecs_to_jiffies(MB_RESET_DELAY);
|
|
bay->state = mb_enabling_bay;
|
|
pr_debug("mediabay%d: enabling (kind:%d)\n", i, bay->content_id);
|
|
break;
|
|
case mb_enabling_bay:
|
|
bay->ops->un_reset(bay);
|
|
bay->timer = msecs_to_jiffies(MB_SETUP_DELAY);
|
|
bay->state = mb_resetting;
|
|
pr_debug("mediabay%d: releasing bay reset (kind:%d)\n",
|
|
i, bay->content_id);
|
|
break;
|
|
case mb_resetting:
|
|
if (bay->content_id != MB_CD) {
|
|
pr_debug("mediabay%d: bay is up (kind:%d)\n", i,
|
|
bay->content_id);
|
|
bay->state = mb_up;
|
|
device_for_each_child(&bay->mdev->ofdev.dev,
|
|
bay, mb_broadcast_hotplug);
|
|
break;
|
|
}
|
|
pr_debug("mediabay%d: releasing ATA reset (kind:%d)\n",
|
|
i, bay->content_id);
|
|
bay->ops->un_reset_ide(bay);
|
|
bay->timer = msecs_to_jiffies(MB_IDE_WAIT);
|
|
bay->state = mb_ide_resetting;
|
|
break;
|
|
|
|
case mb_ide_resetting:
|
|
pr_debug("mediabay%d: bay is up (kind:%d)\n", i, bay->content_id);
|
|
bay->state = mb_up;
|
|
device_for_each_child(&bay->mdev->ofdev.dev,
|
|
bay, mb_broadcast_hotplug);
|
|
break;
|
|
|
|
case mb_powering_down:
|
|
bay->state = mb_empty;
|
|
device_for_each_child(&bay->mdev->ofdev.dev,
|
|
bay, mb_broadcast_hotplug);
|
|
pr_debug("mediabay%d: end of power down\n", i);
|
|
break;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This procedure runs as a kernel thread to poll the media bay
|
|
* once each tick and register and unregister the IDE interface
|
|
* with the IDE driver. It needs to be a thread because
|
|
* ide_register can't be called from interrupt context.
|
|
*/
|
|
static int media_bay_task(void *x)
|
|
{
|
|
int i;
|
|
|
|
while (!kthread_should_stop()) {
|
|
for (i = 0; i < media_bay_count; ++i) {
|
|
mutex_lock(&media_bays[i].lock);
|
|
if (!media_bays[i].sleeping)
|
|
media_bay_step(i);
|
|
mutex_unlock(&media_bays[i].lock);
|
|
}
|
|
|
|
msleep_interruptible(MB_POLL_DELAY);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int media_bay_attach(struct macio_dev *mdev,
|
|
const struct of_device_id *match)
|
|
{
|
|
struct media_bay_info* bay;
|
|
u32 __iomem *regbase;
|
|
struct device_node *ofnode;
|
|
unsigned long base;
|
|
int i;
|
|
|
|
ofnode = mdev->ofdev.dev.of_node;
|
|
|
|
if (macio_resource_count(mdev) < 1)
|
|
return -ENODEV;
|
|
if (macio_request_resources(mdev, "media-bay"))
|
|
return -EBUSY;
|
|
/* Media bay registers are located at the beginning of the
|
|
* mac-io chip, for now, we trick and align down the first
|
|
* resource passed in
|
|
*/
|
|
base = macio_resource_start(mdev, 0) & 0xffff0000u;
|
|
regbase = (u32 __iomem *)ioremap(base, 0x100);
|
|
if (regbase == NULL) {
|
|
macio_release_resources(mdev);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
i = media_bay_count++;
|
|
bay = &media_bays[i];
|
|
bay->mdev = mdev;
|
|
bay->base = regbase;
|
|
bay->index = i;
|
|
bay->ops = match->data;
|
|
bay->sleeping = 0;
|
|
mutex_init(&bay->lock);
|
|
|
|
/* Init HW probing */
|
|
if (bay->ops->init)
|
|
bay->ops->init(bay);
|
|
|
|
printk(KERN_INFO "mediabay%d: Registered %s media-bay\n", i, bay->ops->name);
|
|
|
|
/* Force an immediate detect */
|
|
set_mb_power(bay, 0);
|
|
msleep(MB_POWER_DELAY);
|
|
bay->content_id = MB_NO;
|
|
bay->last_value = bay->ops->content(bay);
|
|
bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
|
|
bay->state = mb_empty;
|
|
|
|
/* Mark us ready by filling our mdev data */
|
|
macio_set_drvdata(mdev, bay);
|
|
|
|
/* Startup kernel thread */
|
|
if (i == 0)
|
|
kthread_run(media_bay_task, NULL, "media-bay");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
static int media_bay_suspend(struct macio_dev *mdev, pm_message_t state)
|
|
{
|
|
struct media_bay_info *bay = macio_get_drvdata(mdev);
|
|
|
|
if (state.event != mdev->ofdev.dev.power.power_state.event
|
|
&& (state.event & PM_EVENT_SLEEP)) {
|
|
mutex_lock(&bay->lock);
|
|
bay->sleeping = 1;
|
|
set_mb_power(bay, 0);
|
|
mutex_unlock(&bay->lock);
|
|
msleep(MB_POLL_DELAY);
|
|
mdev->ofdev.dev.power.power_state = state;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int media_bay_resume(struct macio_dev *mdev)
|
|
{
|
|
struct media_bay_info *bay = macio_get_drvdata(mdev);
|
|
|
|
if (mdev->ofdev.dev.power.power_state.event != PM_EVENT_ON) {
|
|
mdev->ofdev.dev.power.power_state = PMSG_ON;
|
|
|
|
/* We re-enable the bay using it's previous content
|
|
only if it did not change. Note those bozo timings,
|
|
they seem to help the 3400 get it right.
|
|
*/
|
|
/* Force MB power to 0 */
|
|
mutex_lock(&bay->lock);
|
|
set_mb_power(bay, 0);
|
|
msleep(MB_POWER_DELAY);
|
|
if (bay->ops->content(bay) != bay->content_id) {
|
|
printk("mediabay%d: Content changed during sleep...\n", bay->index);
|
|
mutex_unlock(&bay->lock);
|
|
return 0;
|
|
}
|
|
set_mb_power(bay, 1);
|
|
bay->last_value = bay->content_id;
|
|
bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
|
|
bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
|
|
do {
|
|
msleep(MB_POLL_DELAY);
|
|
media_bay_step(bay->index);
|
|
} while((bay->state != mb_empty) &&
|
|
(bay->state != mb_up));
|
|
bay->sleeping = 0;
|
|
mutex_unlock(&bay->lock);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Definitions of "ops" structures.
|
|
*/
|
|
static const struct mb_ops ohare_mb_ops = {
|
|
.name = "Ohare",
|
|
.content = ohare_mb_content,
|
|
.power = ohare_mb_power,
|
|
.setup_bus = ohare_mb_setup_bus,
|
|
.un_reset = ohare_mb_un_reset,
|
|
.un_reset_ide = ohare_mb_un_reset_ide,
|
|
};
|
|
|
|
static const struct mb_ops heathrow_mb_ops = {
|
|
.name = "Heathrow",
|
|
.content = heathrow_mb_content,
|
|
.power = heathrow_mb_power,
|
|
.setup_bus = heathrow_mb_setup_bus,
|
|
.un_reset = heathrow_mb_un_reset,
|
|
.un_reset_ide = heathrow_mb_un_reset_ide,
|
|
};
|
|
|
|
static const struct mb_ops keylargo_mb_ops = {
|
|
.name = "KeyLargo",
|
|
.init = keylargo_mb_init,
|
|
.content = keylargo_mb_content,
|
|
.power = keylargo_mb_power,
|
|
.setup_bus = keylargo_mb_setup_bus,
|
|
.un_reset = keylargo_mb_un_reset,
|
|
.un_reset_ide = keylargo_mb_un_reset_ide,
|
|
};
|
|
|
|
/*
|
|
* It seems that the bit for the media-bay interrupt in the IRQ_LEVEL
|
|
* register is always set when there is something in the media bay.
|
|
* This causes problems for the interrupt code if we attach an interrupt
|
|
* handler to the media-bay interrupt, because it tends to go into
|
|
* an infinite loop calling the media bay interrupt handler.
|
|
* Therefore we do it all by polling the media bay once each tick.
|
|
*/
|
|
|
|
static struct of_device_id media_bay_match[] =
|
|
{
|
|
{
|
|
.name = "media-bay",
|
|
.compatible = "keylargo-media-bay",
|
|
.data = &keylargo_mb_ops,
|
|
},
|
|
{
|
|
.name = "media-bay",
|
|
.compatible = "heathrow-media-bay",
|
|
.data = &heathrow_mb_ops,
|
|
},
|
|
{
|
|
.name = "media-bay",
|
|
.compatible = "ohare-media-bay",
|
|
.data = &ohare_mb_ops,
|
|
},
|
|
{},
|
|
};
|
|
|
|
static struct macio_driver media_bay_driver =
|
|
{
|
|
.driver = {
|
|
.name = "media-bay",
|
|
.of_match_table = media_bay_match,
|
|
},
|
|
.probe = media_bay_attach,
|
|
.suspend = media_bay_suspend,
|
|
.resume = media_bay_resume
|
|
};
|
|
|
|
static int __init media_bay_init(void)
|
|
{
|
|
int i;
|
|
|
|
for (i=0; i<MAX_BAYS; i++) {
|
|
memset((char *)&media_bays[i], 0, sizeof(struct media_bay_info));
|
|
media_bays[i].content_id = -1;
|
|
}
|
|
if (!machine_is(powermac))
|
|
return 0;
|
|
|
|
macio_register_driver(&media_bay_driver);
|
|
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(media_bay_init);
|