/* * Driver for the media bay on the PowerBook 3400 and 2400. * * Copyright (C) 1998 Paul Mackerras. * * Various evolutions by Benjamin Herrenschmidt & Henry Worth * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/types.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/delay.h> #include <linux/sched.h> #include <linux/timer.h> #include <linux/stddef.h> #include <linux/init.h> #include <linux/kthread.h> #include <linux/mutex.h> #include <asm/prom.h> #include <asm/pgtable.h> #include <asm/io.h> #include <asm/machdep.h> #include <asm/pmac_feature.h> #include <asm/mediabay.h> #include <asm/sections.h> #include <asm/ohare.h> #include <asm/heathrow.h> #include <asm/keylargo.h> #include <linux/adb.h> #include <linux/pmu.h> #define MB_DEBUG #ifdef MB_DEBUG #define MBDBG(fmt, arg...) printk(KERN_INFO fmt , ## arg) #else #define MBDBG(fmt, arg...) do { } while (0) #endif #define MB_FCR32(bay, r) ((bay)->base + ((r) >> 2)) #define MB_FCR8(bay, r) (((volatile u8 __iomem *)((bay)->base)) + (r)) #define MB_IN32(bay,r) (in_le32(MB_FCR32(bay,r))) #define MB_OUT32(bay,r,v) (out_le32(MB_FCR32(bay,r), (v))) #define MB_BIS(bay,r,v) (MB_OUT32((bay), (r), MB_IN32((bay), r) | (v))) #define MB_BIC(bay,r,v) (MB_OUT32((bay), (r), MB_IN32((bay), r) & ~(v))) #define MB_IN8(bay,r) (in_8(MB_FCR8(bay,r))) #define MB_OUT8(bay,r,v) (out_8(MB_FCR8(bay,r), (v))) struct media_bay_info; struct mb_ops { char* name; void (*init)(struct media_bay_info *bay); u8 (*content)(struct media_bay_info *bay); void (*power)(struct media_bay_info *bay, int on_off); int (*setup_bus)(struct media_bay_info *bay, u8 device_id); void (*un_reset)(struct media_bay_info *bay); void (*un_reset_ide)(struct media_bay_info *bay); }; struct media_bay_info { u32 __iomem *base; int content_id; int state; int last_value; int value_count; int timer; struct macio_dev *mdev; struct mb_ops* ops; int index; int cached_gpio; int sleeping; struct mutex lock; #ifdef CONFIG_BLK_DEV_IDE_PMAC ide_hwif_t *cd_port; void __iomem *cd_base; int cd_irq; int cd_retry; #endif #if defined(CONFIG_BLK_DEV_IDE_PMAC) int cd_index; #endif }; #define MAX_BAYS 2 static struct media_bay_info media_bays[MAX_BAYS]; int media_bay_count = 0; #ifdef CONFIG_BLK_DEV_IDE_PMAC /* check the busy bit in the media-bay ide interface (assumes the media-bay contains an ide device) */ #define MB_IDE_READY(i) ((readb(media_bays[i].cd_base + 0x70) & 0x80) == 0) #endif /* * Wait that number of ms between each step in normal polling mode */ #define MB_POLL_DELAY 25 /* * Consider the media-bay ID value stable if it is the same for * this number of milliseconds */ #define MB_STABLE_DELAY 100 /* Wait after powering up the media bay this delay in ms * timeout bumped for some powerbooks */ #define MB_POWER_DELAY 200 /* * Hold the media-bay reset signal true for this many ticks * after a device is inserted before releasing it. */ #define MB_RESET_DELAY 50 /* * Wait this long after the reset signal is released and before doing * further operations. After this delay, the IDE reset signal is released * too for an IDE device */ #define MB_SETUP_DELAY 100 /* * Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted * (or until the device is ready) before waiting for busy bit to disappear */ #define MB_IDE_WAIT 1000 /* * Timeout waiting for busy bit of an IDE device to go down */ #define MB_IDE_TIMEOUT 5000 /* * Max retries of the full power up/down sequence for an IDE device */ #define MAX_CD_RETRIES 3 /* * States of a media bay */ enum { mb_empty = 0, /* Idle */ mb_powering_up, /* power bit set, waiting MB_POWER_DELAY */ mb_enabling_bay, /* enable bits set, waiting MB_RESET_DELAY */ mb_resetting, /* reset bit unset, waiting MB_SETUP_DELAY */ mb_ide_resetting, /* IDE reset bit unser, waiting MB_IDE_WAIT */ mb_ide_waiting, /* Waiting for BUSY bit to go away until MB_IDE_TIMEOUT */ mb_up, /* Media bay full */ mb_powering_down /* Powering down (avoid too fast down/up) */ }; #define MB_POWER_SOUND 0x08 #define MB_POWER_FLOPPY 0x04 #define MB_POWER_ATA 0x02 #define MB_POWER_PCI 0x01 #define MB_POWER_OFF 0x00 /* * Functions for polling content of media bay */ static u8 ohare_mb_content(struct media_bay_info *bay) { return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7; } static u8 heathrow_mb_content(struct media_bay_info *bay) { return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7; } static u8 keylargo_mb_content(struct media_bay_info *bay) { int new_gpio; new_gpio = MB_IN8(bay, KL_GPIO_MEDIABAY_IRQ) & KEYLARGO_GPIO_INPUT_DATA; if (new_gpio) { bay->cached_gpio = new_gpio; return MB_NO; } else if (bay->cached_gpio != new_gpio) { MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE); (void)MB_IN32(bay, KEYLARGO_MBCR); udelay(5); MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F); (void)MB_IN32(bay, KEYLARGO_MBCR); udelay(5); bay->cached_gpio = new_gpio; } return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7; } /* * Functions for powering up/down the bay, puts the bay device * into reset state as well */ static void ohare_mb_power(struct media_bay_info* bay, int on_off) { if (on_off) { /* Power up device, assert it's reset line */ MB_BIC(bay, OHARE_FCR, OH_BAY_RESET_N); MB_BIC(bay, OHARE_FCR, OH_BAY_POWER_N); } else { /* Disable all devices */ MB_BIC(bay, OHARE_FCR, OH_BAY_DEV_MASK); MB_BIC(bay, OHARE_FCR, OH_FLOPPY_ENABLE); /* Cut power from bay, release reset line */ MB_BIS(bay, OHARE_FCR, OH_BAY_POWER_N); MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N); MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N); } MB_BIC(bay, OHARE_MBCR, 0x00000F00); } static void heathrow_mb_power(struct media_bay_info* bay, int on_off) { if (on_off) { /* Power up device, assert it's reset line */ MB_BIC(bay, HEATHROW_FCR, HRW_BAY_RESET_N); MB_BIC(bay, HEATHROW_FCR, HRW_BAY_POWER_N); } else { /* Disable all devices */ MB_BIC(bay, HEATHROW_FCR, HRW_BAY_DEV_MASK); MB_BIC(bay, HEATHROW_FCR, HRW_SWIM_ENABLE); /* Cut power from bay, release reset line */ MB_BIS(bay, HEATHROW_FCR, HRW_BAY_POWER_N); MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N); MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N); } MB_BIC(bay, HEATHROW_MBCR, 0x00000F00); } static void keylargo_mb_power(struct media_bay_info* bay, int on_off) { if (on_off) { /* Power up device, assert it's reset line */ MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET); MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER); } else { /* Disable all devices */ MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_MASK); MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE); /* Cut power from bay, release reset line */ MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER); MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET); MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N); } MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F); } /* * Functions for configuring the media bay for a given type of device, * enable the related busses */ static int ohare_mb_setup_bus(struct media_bay_info* bay, u8 device_id) { switch(device_id) { case MB_FD: case MB_FD1: MB_BIS(bay, OHARE_FCR, OH_BAY_FLOPPY_ENABLE); MB_BIS(bay, OHARE_FCR, OH_FLOPPY_ENABLE); return 0; case MB_CD: MB_BIC(bay, OHARE_FCR, OH_IDE1_RESET_N); MB_BIS(bay, OHARE_FCR, OH_BAY_IDE_ENABLE); return 0; case MB_PCI: MB_BIS(bay, OHARE_FCR, OH_BAY_PCI_ENABLE); return 0; } return -ENODEV; } static int heathrow_mb_setup_bus(struct media_bay_info* bay, u8 device_id) { switch(device_id) { case MB_FD: case MB_FD1: MB_BIS(bay, HEATHROW_FCR, HRW_BAY_FLOPPY_ENABLE); MB_BIS(bay, HEATHROW_FCR, HRW_SWIM_ENABLE); return 0; case MB_CD: MB_BIC(bay, HEATHROW_FCR, HRW_IDE1_RESET_N); MB_BIS(bay, HEATHROW_FCR, HRW_BAY_IDE_ENABLE); return 0; case MB_PCI: MB_BIS(bay, HEATHROW_FCR, HRW_BAY_PCI_ENABLE); return 0; } return -ENODEV; } static int keylargo_mb_setup_bus(struct media_bay_info* bay, u8 device_id) { switch(device_id) { case MB_CD: MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_IDE_ENABLE); MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N); MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE); return 0; case MB_PCI: MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_PCI_ENABLE); return 0; case MB_SOUND: MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_SOUND_ENABLE); return 0; } return -ENODEV; } /* * Functions for tweaking resets */ static void ohare_mb_un_reset(struct media_bay_info* bay) { MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N); } static void keylargo_mb_init(struct media_bay_info *bay) { MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE); } static void heathrow_mb_un_reset(struct media_bay_info* bay) { MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N); } static void keylargo_mb_un_reset(struct media_bay_info* bay) { MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET); } static void ohare_mb_un_reset_ide(struct media_bay_info* bay) { MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N); } static void heathrow_mb_un_reset_ide(struct media_bay_info* bay) { MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N); } static void keylargo_mb_un_reset_ide(struct media_bay_info* bay) { MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N); } static inline void set_mb_power(struct media_bay_info* bay, int onoff) { /* Power up up and assert the bay reset line */ if (onoff) { bay->ops->power(bay, 1); bay->state = mb_powering_up; MBDBG("mediabay%d: powering up\n", bay->index); } else { /* Make sure everything is powered down & disabled */ bay->ops->power(bay, 0); bay->state = mb_powering_down; MBDBG("mediabay%d: powering down\n", bay->index); } bay->timer = msecs_to_jiffies(MB_POWER_DELAY); } static void poll_media_bay(struct media_bay_info* bay) { int id = bay->ops->content(bay); if (id == bay->last_value) { if (id != bay->content_id) { bay->value_count += msecs_to_jiffies(MB_POLL_DELAY); if (bay->value_count >= msecs_to_jiffies(MB_STABLE_DELAY)) { /* If the device type changes without going thru * "MB_NO", we force a pass by "MB_NO" to make sure * things are properly reset */ if ((id != MB_NO) && (bay->content_id != MB_NO)) { id = MB_NO; MBDBG("mediabay%d: forcing MB_NO\n", bay->index); } MBDBG("mediabay%d: switching to %d\n", bay->index, id); set_mb_power(bay, id != MB_NO); bay->content_id = id; if (id == MB_NO) { #ifdef CONFIG_BLK_DEV_IDE_PMAC bay->cd_retry = 0; #endif printk(KERN_INFO "media bay %d is empty\n", bay->index); } } } } else { bay->last_value = id; bay->value_count = 0; } } #ifdef CONFIG_BLK_DEV_IDE_PMAC int check_media_bay(struct device_node *which_bay, int what) { int i; for (i=0; i<media_bay_count; i++) if (media_bays[i].mdev && which_bay == media_bays[i].mdev->ofdev.node) { if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up) return 0; media_bays[i].cd_index = -1; return -EINVAL; } return -ENODEV; } EXPORT_SYMBOL(check_media_bay); int check_media_bay_by_base(unsigned long base, int what) { int i; for (i=0; i<media_bay_count; i++) if (media_bays[i].mdev && base == (unsigned long) media_bays[i].cd_base) { if ((what == media_bays[i].content_id) && media_bays[i].state == mb_up) return 0; media_bays[i].cd_index = -1; return -EINVAL; } return -ENODEV; } EXPORT_SYMBOL_GPL(check_media_bay_by_base); int media_bay_set_ide_infos(struct device_node* which_bay, unsigned long base, int irq, ide_hwif_t *hwif) { int i; for (i=0; i<media_bay_count; i++) { struct media_bay_info* bay = &media_bays[i]; if (bay->mdev && which_bay == bay->mdev->ofdev.node) { int timeout = 5000, index = hwif->index; mutex_lock(&bay->lock); bay->cd_port = hwif; bay->cd_base = (void __iomem *) base; bay->cd_irq = irq; if ((MB_CD != bay->content_id) || bay->state != mb_up) { mutex_unlock(&bay->lock); return 0; } printk(KERN_DEBUG "Registered ide%d for media bay %d\n", index, i); do { if (MB_IDE_READY(i)) { bay->cd_index = index; mutex_unlock(&bay->lock); return 0; } mdelay(1); } while(--timeout); printk(KERN_DEBUG "Timeount waiting IDE in bay %d\n", i); mutex_unlock(&bay->lock); return -ENODEV; } } return -ENODEV; } EXPORT_SYMBOL_GPL(media_bay_set_ide_infos); #endif /* CONFIG_BLK_DEV_IDE_PMAC */ static void media_bay_step(int i) { struct media_bay_info* bay = &media_bays[i]; /* We don't poll when powering down */ if (bay->state != mb_powering_down) poll_media_bay(bay); /* If timer expired or polling IDE busy, run state machine */ if ((bay->state != mb_ide_waiting) && (bay->timer != 0)) { bay->timer -= msecs_to_jiffies(MB_POLL_DELAY); if (bay->timer > 0) return; bay->timer = 0; } switch(bay->state) { case mb_powering_up: if (bay->ops->setup_bus(bay, bay->last_value) < 0) { MBDBG("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; MBDBG("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; MBDBG("mediabay%d: waiting reset (kind:%d)\n", i, bay->content_id); break; case mb_resetting: if (bay->content_id != MB_CD) { MBDBG("mediabay%d: bay is up (kind:%d)\n", i, bay->content_id); bay->state = mb_up; break; } #ifdef CONFIG_BLK_DEV_IDE_PMAC MBDBG("mediabay%d: waiting IDE 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; #else printk(KERN_DEBUG "media-bay %d is ide (not compiled in kernel)\n", i); set_mb_power(bay, 0); #endif /* CONFIG_BLK_DEV_IDE_PMAC */ break; #ifdef CONFIG_BLK_DEV_IDE_PMAC case mb_ide_resetting: bay->timer = msecs_to_jiffies(MB_IDE_TIMEOUT); bay->state = mb_ide_waiting; MBDBG("mediabay%d: waiting IDE ready (kind:%d)\n", i, bay->content_id); break; case mb_ide_waiting: if (bay->cd_base == NULL) { bay->timer = 0; bay->state = mb_up; MBDBG("mediabay%d: up before IDE init\n", i); break; } else if (MB_IDE_READY(i)) { bay->timer = 0; bay->state = mb_up; if (bay->cd_index < 0) { printk("mediabay %d, registering IDE...\n", i); pmu_suspend(); ide_port_scan(bay->cd_port); if (bay->cd_port->present) bay->cd_index = bay->cd_port->index; pmu_resume(); } if (bay->cd_index == -1) { /* We eventually do a retry */ bay->cd_retry++; printk("IDE register error\n"); set_mb_power(bay, 0); } else { printk(KERN_DEBUG "media-bay %d is ide%d\n", i, bay->cd_index); MBDBG("mediabay %d IDE ready\n", i); } break; } else if (bay->timer > 0) bay->timer -= msecs_to_jiffies(MB_POLL_DELAY); if (bay->timer <= 0) { printk("\nIDE Timeout in bay %d !, IDE state is: 0x%02x\n", i, readb(bay->cd_base + 0x70)); MBDBG("mediabay%d: nIDE Timeout !\n", i); set_mb_power(bay, 0); bay->timer = 0; } break; #endif /* CONFIG_BLK_DEV_IDE_PMAC */ case mb_powering_down: bay->state = mb_empty; #ifdef CONFIG_BLK_DEV_IDE_PMAC if (bay->cd_index >= 0) { printk(KERN_DEBUG "Unregistering mb %d ide, index:%d\n", i, bay->cd_index); ide_port_unregister_devices(bay->cd_port); bay->cd_index = -1; } if (bay->cd_retry) { if (bay->cd_retry > MAX_CD_RETRIES) { /* Should add an error sound (sort of beep in dmasound) */ printk("\nmedia-bay %d, IDE device badly inserted or unrecognised\n", i); } else { /* Force a new power down/up sequence */ bay->content_id = MB_NO; } } #endif /* CONFIG_BLK_DEV_IDE_PMAC */ MBDBG("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 __devinit 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.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; do { msleep(MB_POLL_DELAY); media_bay_step(i); } while((bay->state != mb_empty) && (bay->state != mb_up)); /* 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); #ifdef CONFIG_BLK_DEV_IDE_PMAC bay->cd_retry = 0; #endif 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 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 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 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 = { .name = "media-bay", .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; #ifdef CONFIG_BLK_DEV_IDE_PMAC media_bays[i].cd_index = -1; #endif } if (!machine_is(powermac)) return 0; macio_register_driver(&media_bay_driver); return 0; } device_initcall(media_bay_init);