/* * 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_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; const struct mb_ops* ops; int index; int cached_gpio; int sleeping; int user_lock; struct mutex lock; }; #define MAX_BAYS 2 static struct media_bay_info media_bays[MAX_BAYS]; static int media_bay_count = 0; /* * 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 calling into the driver */ #define MB_IDE_WAIT 1000 /* * 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_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; pr_debug("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; pr_debug("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); static char *mb_content_types[] = { "a floppy drive", "a floppy drive", "an unsupported audio device", "an ATA device", "an unsupported PCI device", "an unknown device", }; if (id != bay->last_value) { bay->last_value = id; bay->value_count = 0; return; } if (id == bay->content_id) return; 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; pr_debug("mediabay%d: forcing MB_NO\n", bay->index); } pr_debug("mediabay%d: switching to %d\n", bay->index, id); set_mb_power(bay, id != MB_NO); bay->content_id = id; if (id >= MB_NO || id < 0) printk(KERN_INFO "mediabay%d: Bay is now empty\n", bay->index); else printk(KERN_INFO "mediabay%d: Bay contains %s\n", bay->index, mb_content_types[id]); } } int check_media_bay(struct macio_dev *baydev) { struct media_bay_info* bay; int id; if (baydev == NULL) return MB_NO; /* This returns an instant snapshot, not locking, sine * we may be called with the bay lock held. The resulting * fuzzyness of the result if called at the wrong time is * not actually a huge deal */ bay = macio_get_drvdata(baydev); if (bay == NULL) return MB_NO; id = bay->content_id; if (bay->state != mb_up) return MB_NO; if (id == MB_FD1) return MB_FD; return id; } EXPORT_SYMBOL_GPL(check_media_bay); void lock_media_bay(struct macio_dev *baydev) { struct media_bay_info* bay; if (baydev == NULL) return; bay = macio_get_drvdata(baydev); if (bay == NULL) return; mutex_lock(&bay->lock); bay->user_lock = 1; } EXPORT_SYMBOL_GPL(lock_media_bay); void unlock_media_bay(struct macio_dev *baydev) { struct media_bay_info* bay; if (baydev == NULL) return; bay = macio_get_drvdata(baydev); if (bay == NULL) return; if (bay->user_lock) { bay->user_lock = 0; mutex_unlock(&bay->lock); } } EXPORT_SYMBOL_GPL(unlock_media_bay); static int mb_broadcast_hotplug(struct device *dev, void *data) { struct media_bay_info* bay = data; struct macio_dev *mdev; struct macio_driver *drv; int state; if (dev->bus != &macio_bus_type) return 0; state = bay->state == mb_up ? bay->content_id : MB_NO; if (state == MB_FD1) state = MB_FD; mdev = to_macio_device(dev); drv = to_macio_driver(dev->driver); if (dev->driver && drv->mediabay_event) drv->mediabay_event(mdev, state); return 0; } 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 run state machine */ if (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) { 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);