Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 851 insertions, 0 deletions

diff --git a/drivers/macintosh/mediabay.c b/drivers/macintosh/mediabay.c
new file mode 100644
index 000000000000..b8b5a2f1485a
--- /dev/null
+++ b/drivers/macintosh/mediabay.c
@@ -0,0 +1,851 @@
+/*
+ * 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/config.h>
+#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/hdreg.h>
+#include <linux/stddef.h>
+#include <linux/init.h>
+#include <linux/ide.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
+#define MB_IGNORE_SIGNALS
+
+#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 semaphore		lock;
+#ifdef CONFIG_BLK_DEV_IDE
+	void __iomem			*cd_base;
+	int 				cd_index;
+	int				cd_irq;
+	int				cd_retry;
+#endif
+};
+
+#define MAX_BAYS	2
+
+static struct media_bay_info media_bays[MAX_BAYS];
+int media_bay_count = 0;
+
+#ifdef CONFIG_BLK_DEV_IDE
+/* 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 __pmac
+ohare_mb_content(struct media_bay_info *bay)
+{
+	return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
+}
+
+static u8 __pmac
+heathrow_mb_content(struct media_bay_info *bay)
+{
+	return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
+}
+
+static u8 __pmac
+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 __pmac
+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 __pmac
+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 __pmac
+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 __pmac
+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 __pmac
+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 __pmac
+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 __pmac
+ohare_mb_un_reset(struct media_bay_info* bay)
+{
+	MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
+}
+
+static void __pmac keylargo_mb_init(struct media_bay_info *bay)
+{
+	MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
+}
+
+static void __pmac heathrow_mb_un_reset(struct media_bay_info* bay)
+{
+	MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
+}
+
+static void __pmac keylargo_mb_un_reset(struct media_bay_info* bay)
+{
+	MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
+}
+
+static void __pmac ohare_mb_un_reset_ide(struct media_bay_info* bay)
+{
+	MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
+}
+
+static void __pmac heathrow_mb_un_reset_ide(struct media_bay_info* bay)
+{
+	MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
+}
+
+static void __pmac keylargo_mb_un_reset_ide(struct media_bay_info* bay)
+{
+	MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
+}
+
+static inline void __pmac 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 __pmac 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
+					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;
+	}
+}
+
+int __pmac check_media_bay(struct device_node *which_bay, int what)
+{
+#ifdef CONFIG_BLK_DEV_IDE
+	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;
+		}
+#endif /* CONFIG_BLK_DEV_IDE */
+	return -ENODEV;
+}
+EXPORT_SYMBOL(check_media_bay);
+
+int __pmac check_media_bay_by_base(unsigned long base, int what)
+{
+#ifdef CONFIG_BLK_DEV_IDE
+	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;
+		} 
+#endif
+	
+	return -ENODEV;
+}
+
+int __pmac media_bay_set_ide_infos(struct device_node* which_bay, unsigned long base,
+	int irq, int index)
+{
+#ifdef CONFIG_BLK_DEV_IDE
+	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;
+			
+			down(&bay->lock);
+
+ 			bay->cd_base	= (void __iomem *) base;
+			bay->cd_irq	= irq;
+
+			if ((MB_CD != bay->content_id) || bay->state != mb_up) {
+				up(&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;
+					up(&bay->lock);
+					return 0;
+				}
+				mdelay(1);
+			} while(--timeout);
+			printk(KERN_DEBUG "Timeount waiting IDE in bay %d\n", i);
+			up(&bay->lock);
+			return -ENODEV;
+		}
+	}
+#endif /* CONFIG_BLK_DEV_IDE */
+	
+	return -ENODEV;
+}
+
+static void __pmac 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
+		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 */
+	    	break;
+	    
+#ifdef CONFIG_BLK_DEV_IDE
+	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) {
+				hw_regs_t hw;
+
+				printk("mediabay %d, registering IDE...\n", i);
+				pmu_suspend();
+				ide_init_hwif_ports(&hw, (unsigned long) bay->cd_base, (unsigned long) 0, NULL);
+				hw.irq = bay->cd_irq;
+				hw.chipset = ide_pmac;
+				bay->cd_index = ide_register_hw(&hw, NULL);
+				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 */
+
+	case mb_powering_down:
+	    	bay->state = mb_empty;
+#ifdef CONFIG_BLK_DEV_IDE
+    	        if (bay->cd_index >= 0) {
+			printk(KERN_DEBUG "Unregistering mb %d ide, index:%d\n", i,
+			       bay->cd_index);
+			ide_unregister(bay->cd_index);
+			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 */    
+		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 __pmac media_bay_task(void *x)
+{
+	int	i;
+
+	strcpy(current->comm, "media-bay");
+#ifdef MB_IGNORE_SIGNALS
+	sigfillset(&current->blocked);
+#endif
+
+	for (;;) {
+		for (i = 0; i < media_bay_count; ++i) {
+			down(&media_bays[i].lock);
+			if (!media_bays[i].sleeping)
+				media_bay_step(i);
+			up(&media_bays[i].lock);
+		}
+
+		msleep_interruptible(MB_POLL_DELAY);
+		if (signal_pending(current))
+			return 0;
+	}
+}
+
+static int __devinit media_bay_attach(struct macio_dev *mdev, const struct of_match *match)
+{
+	struct media_bay_info* bay;
+	u32 __iomem *regbase;
+	struct device_node *ofnode;
+	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, we get the parent address for now (hrm...)
+         */
+	regbase = (u32 __iomem *)
+		ioremap(ofnode->parent->addrs[0].address, 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;
+	init_MUTEX(&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)
+		kernel_thread(media_bay_task, NULL, CLONE_KERNEL);
+
+	return 0;
+
+}
+
+static int __pmac media_bay_suspend(struct macio_dev *mdev, u32 state)
+{
+	struct media_bay_info	*bay = macio_get_drvdata(mdev);
+
+	if (state != mdev->ofdev.dev.power.power_state && state == PM_SUSPEND_MEM) {
+		down(&bay->lock);
+		bay->sleeping = 1;
+		set_mb_power(bay, 0);
+		up(&bay->lock);
+		msleep(MB_POLL_DELAY);
+		mdev->ofdev.dev.power.power_state = state;
+	}
+	return 0;
+}
+
+static int __pmac media_bay_resume(struct macio_dev *mdev)
+{
+	struct media_bay_info	*bay = macio_get_drvdata(mdev);
+
+	if (mdev->ofdev.dev.power.power_state != 0) {
+		mdev->ofdev.dev.power.power_state = 0;
+
+	       	/* 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 */
+		down(&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);
+			up(&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
+	       	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;
+		up(&bay->lock);
+	}
+	return 0;
+}
+
+
+/* Definitions of "ops" structures.
+ */
+static struct mb_ops ohare_mb_ops __pmacdata = {
+	.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 __pmacdata = {
+	.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 __pmacdata = {
+	.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_match media_bay_match[] =
+{
+	{
+	.name		= "media-bay",
+	.type		= OF_ANY_MATCH,
+	.compatible	= "keylargo-media-bay",
+	.data		= &keylargo_mb_ops,
+	},
+	{
+	.name		= "media-bay",
+	.type		= OF_ANY_MATCH,
+	.compatible	= "heathrow-media-bay",
+	.data		= &heathrow_mb_ops,
+	},
+	{
+	.name		= "media-bay",
+	.type		= OF_ANY_MATCH,
+	.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
+		media_bays[i].cd_index		= -1;
+#endif
+	}
+	if (_machine != _MACH_Pmac)
+		return -ENODEV;
+
+	macio_register_driver(&media_bay_driver);	
+
+	return 0;
+}
+
+device_initcall(media_bay_init);