drivers/macintosh/mediabay.c - kernel/msm-4.9 - Gitiles

 /*
  * 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);
	/*
	* 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);