[PATCH 0/4] 83xx Power Management

@@ -64,6 +64,27 @@ phys_addr_t get_immrbase(void)
 
 EXPORT_SYMBOL(get_immrbase);
 
+u32 fsl_get_sys_freq(void)
+{
+	struct device_node *soc = of_find_node_by_type(NULL, "soc");
+	const u32 *freq;
+	u32 ret = 0;
+
+	if (!soc)
+		goto err;
+
+	freq = of_get_property(soc, "bus-frequency", NULL);
+	if (!freq)
+		goto err;
+
+	ret = *freq;
+
+err:
+	of_node_put(soc);
+	return ret;
+}
+EXPORT_SYMBOL(fsl_get_sys_freq);
+
 #if defined(CONFIG_CPM2) || defined(CONFIG_8xx)
 
 static u32 brgfreq = -1;

@@ -356,9 +377,9 @@ arch_initcall(fsl_i2c_of_init);
 static int __init mpc83xx_wdt_init(void)
 {
 	struct resource r;
-	struct device_node *soc, *np;
+	struct device_node *np;
 	struct platform_device *dev;
-	const unsigned int *freq;
+	u32 freq = fsl_get_sys_freq();
 	int ret;
 
 	np = of_find_compatible_node(NULL, "watchdog", "mpc83xx_wdt");

@@ -368,19 +389,6 @@ static int __init mpc83xx_wdt_init(void)
 		goto nodev;
 	}
 
-	soc = of_find_node_by_type(NULL, "soc");
-
-	if (!soc) {
-		ret = -ENODEV;
-		goto nosoc;
-	}
-
-	freq = of_get_property(soc, "bus-frequency", NULL);
-	if (!freq) {
-		ret = -ENODEV;
-		goto err;
-	}
-
 	memset(&r, 0, sizeof(r));
 
 	ret = of_address_to_resource(np, 0, &r);

@@ -393,20 +401,16 @@ static int __init mpc83xx_wdt_init(void)
 		goto err;
 	}
 
-	ret = platform_device_add_data(dev, freq, sizeof(int));
+	ret = platform_device_add_data(dev, &freq, sizeof(int));
 	if (ret)
 		goto unreg;
 
-	of_node_put(soc);
 	of_node_put(np);
-
 	return 0;
 
 unreg:
 	platform_device_unregister(dev);
 err:
-	of_node_put(soc);
-nosoc:
 	of_node_put(np);
 nodev:
 	return ret;

@@ -7,6 +7,7 @@
 extern phys_addr_t get_immrbase(void);
 extern u32 get_brgfreq(void);
 extern u32 get_baudrate(void);
+extern u32 fsl_get_sys_freq(void);
 
 #endif
 #endif

@@ -81,3 +81,12 @@ config PPC_83xx_PM
 	default y
 	depends on PPC_83xx && PM
 	select PPC32_SUSPEND
+
+config MPC83xx_GTM
+	tristate "83xx General-Purpose Timers for PM wakeup"
+	help
+	  This enables a driver for the GTM4 timer, to be used
+	  as a wakeup source for suspend-to-RAM.  To arm the
+	  timer, write the number of seconds until expiration
+	  to the "timeout" file in the device's sysfs directory.
+	  To disarm, write 0 to the "timeout" file.

@@ -4,6 +4,7 @@
 obj-y				:= misc.o usb.o
 obj-$(CONFIG_PCI)		+= pci.o
 obj-$(CONFIG_PM)		+= pm.o sleep.o
+obj-$(CONFIG_MPC83xx_GTM)	+= timer.o
 obj-$(CONFIG_MPC8313_RDB)	+= mpc8313_rdb.o
 obj-$(CONFIG_MPC832x_RDB)	+= mpc832x_rdb.o
 obj-$(CONFIG_MPC834x_MDS)	+= mpc834x_mds.o

@@ -0,0 +1,299 @@
+/*
+ * MPC83xx Global Timer4 support
+ *
+ * This driver is currently specific to timer 4 in 16-bit mode,
+ * as that is all that can be used as a wakeup source for deep sleep
+ * on the MPC8313.
+ *
+ * Copyright (c) 2007 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/interrupt.h>
+#include <linux/sysfs.h>
+
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/of_platform.h>
+
+#include <sysdev/fsl_soc.h>
+
+#define MDR_ICLK_DIV16	0x0004
+
+struct gtm_regs {
+	u8    cfr1; /* Timer1/2 Configuration  */
+	#define CFR1_PCAS 0x80 /* Pair Cascade mode  */
+	#define CFR1_BCM  0x40  /* Backward compatible mode  */
+	#define CFR1_STP2 0x20 /* Stop timer  */
+	#define CFR1_RST2 0x10 /* Reset timer  */
+	#define CFR1_GM2  0x08 /* Gate mode for pin 2  */
+	#define CFR1_GM1  0x04 /* Gate mode for pin 1  */
+	#define CFR1_STP1 0x02 /* Stop timer  */
+	#define CFR1_RST1 0x01 /* Reset timer  */
+	#define CFR1_RES ~(CFR1_PCAS | CFR1_STP2 | CFR1_RST2 | CFR1_GM2 |\
+		CFR1_GM1 | CFR1_STP1 | CFR1_RST1)
+
+	u8    res0[3];
+	u8    cfr2; /* Timer3/4 Configuration  */
+	#define CFR2_PCAS 0x80 /* Pair Cascade mode  */
+	#define CFR2_SCAS 0x40 /* Super Cascade mode  */
+	#define CFR2_STP4 0x20 /* Stop timer  */
+	#define CFR2_RST4 0x10 /* Reset timer  */
+	#define CFR2_GM4  0x08 /* Gate mode for pin 4  */
+	#define CFR2_GM3  0x04 /* Gate mode for pin 3  */
+	#define CFR2_STP3 0x02 /* Stop timer  */
+	#define CFR2_RST3 0x01 /* Reset timer  */
+
+	u8    res1[11];
+	u16   mdr1; /* Timer1 Mode Register  */
+	#define MDR_SPS  0xff00 /* Secondary Prescaler value (256) */
+	#define MDR_CE   0x00c0 /* Capture edge and enable interrupt  */
+	#define MDR_OM   0x0020 /* Output mode  */
+	#define MDR_ORI  0x0010 /* Output reference interrupt enable  */
+	#define MDR_FRR  0x0008 /* Free run/restart  */
+	#define MDR_ICLK 0x0006 /* Input clock source for the timer */
+	#define MDR_GE   0x0001 /* Gate enable  */
+
+	u16   mdr2; /* Timer2 Mode Register  */
+	u16   rfr1; /* Timer1 Reference Register  */
+	u16   rfr2; /* Timer2 Reference Register  */
+	u16   cpr1; /* Timer1 Capture Register  */
+	u16   cpr2; /* Timer2 Capture Register  */
+	u16   cnr1; /* Timer1 Counter Register  */
+	u16   cnr2; /* Timer2 Counter Register  */
+	u16   mdr3; /* Timer3 Mode Register  */
+	u16   mdr4; /* Timer4 Mode Register  */
+	u16   rfr3; /* Timer3 Reference Register  */
+	u16   rfr4; /* Timer4 Reference Register  */
+	u16   cpr3; /* Timer3 Capture Register  */
+	u16   cpr4; /* Timer4 Capture Register  */
+	u16   cnr3; /* Timer3 Counter Register  */
+	u16   cnr4; /* Timer4 Counter Register  */
+	u16   evr1; /* Timer1 Event Register  */
+	u16   evr2; /* Timer2 Event Register  */
+	u16   evr3; /* Timer3 Event Register  */
+	u16   evr4; /* Timer4 Event Register  */
+	#define GTEVR_REF 0x0002 /* Output reference event  */
+	#define GTEVR_CAP 0x0001 /* Counter Capture event   */
+	#define GTEVR_RES ~(EVR_CAP|EVR_REF)
+
+	u16   psr1; /* Timer1 Prescaler Register  */
+	u16   psr2; /* Timer2 Prescaler Register  */
+	u16   psr3; /* Timer3 Prescaler Register  */
+	u16   psr4; /* Timer4 Prescaler Register  */
+	#define GTPSR_PPS  0x00FF /* Primary Prescaler Bits (256). */
+	#define GTPSR_RES  ~(GTPSR_PPS)
+};
+
+struct gtm_priv {
+	struct gtm_regs __iomem *regs;
+	int irq;
+	int ticks_per_sec;
+	spinlock_t lock;
+};
+
+static irqreturn_t fsl_gtm_isr(int irq, void *dev_id)
+{
+	struct gtm_priv *priv = dev_id;
+	unsigned long flags;
+	u16 event;
+
+	spin_lock_irqsave(&priv->lock, flags);
+
+	event = in_be16(&priv->regs->evr4);
+	out_be16(&priv->regs->evr4, event);
+
+	if (event & GTEVR_REF)
+		out_8(&priv->regs->cfr2, CFR2_STP4);
+
+	spin_unlock_irqrestore(&priv->lock, flags);
+	return event ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static ssize_t gtm_timeout_store(struct device *dev,
+                                 struct device_attribute *attr,
+                                 const char *buf, size_t count)
+{
+	struct gtm_priv *priv = dev_get_drvdata(dev);
+	unsigned long interval = simple_strtoul(buf, NULL, 0);
+
+	if (interval > 0xffff) {
+		dev_dbg(dev, "gtm: interval %lu (in ns) too long\n", interval);
+		return -EINVAL;
+	}
+
+	interval *= priv->ticks_per_sec;
+
+	if (interval > 0xffff) {
+		dev_dbg(dev, "gtm: interval %lu (in ticks) too long\n",
+		        interval);
+		return -EINVAL;
+	}
+
+	spin_lock_irq(&priv->lock);
+
+	/* reset timer 4 */
+	out_8(&priv->regs->cfr2, CFR2_STP3 | CFR2_STP4);
+
+	if (interval != 0) {
+		out_8(&priv->regs->cfr2, CFR2_GM4 | CFR2_RST4 | CFR2_STP4);
+		/* clear events */
+		out_be16(&priv->regs->evr4, GTEVR_REF | GTEVR_CAP);
+		/* maximum primary prescale (256) */
+		out_be16(&priv->regs->psr4, GTPSR_PPS);
+		/* clear current counter */
+		out_be16(&priv->regs->cnr4, 0x0);
+		/* set count limit */
+		out_be16(&priv->regs->rfr4, interval);
+		out_be16(&priv->regs->mdr4, MDR_SPS | MDR_ORI | MDR_FRR |
+		                            MDR_ICLK_DIV16);
+		/* start timer */
+		out_8(&priv->regs->cfr2, CFR2_GM4 | CFR2_STP3 | CFR2_RST4);
+	}
+
+	spin_unlock_irq(&priv->lock);
+	return count;
+}
+
+static ssize_t gtm_timeout_show(struct device *dev,
+                                struct device_attribute *attr,
+                                char *buf)
+{
+	struct gtm_priv *priv = dev_get_drvdata(dev);
+	int timeout = 0;
+
+	spin_lock_irq(&priv->lock);
+
+	if (!(in_8(&priv->regs->cfr2) & CFR2_STP4)) {
+		timeout = in_be16(&priv->regs->rfr4) -
+		          in_be16(&priv->regs->cnr4);
+		timeout += priv->ticks_per_sec - 1;
+		timeout /= priv->ticks_per_sec;
+	}
+
+	spin_unlock_irq(&priv->lock);
+	return sprintf(buf, "%u\n", timeout);
+}
+
+static DEVICE_ATTR(timeout, 0660, gtm_timeout_show, gtm_timeout_store);
+
+static int __devinit gtm_probe(struct of_device *dev,
+                               const struct of_device_id *match)
+{
+	struct device_node *np = dev->node;
+	struct resource res;
+	int ret = 0;
+	u32 busfreq = fsl_get_sys_freq();
+	struct gtm_priv *priv;
+
+	if (busfreq == 0) {
+		printk(KERN_ERR "gtm: No bus frequency in device tree.\n");
+		return -ENODEV;
+	}
+
+	priv = kmalloc(sizeof(struct gtm_priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	spin_lock_init(&priv->lock);
+	dev_set_drvdata(&dev->dev, priv);
+
+	ret = of_address_to_resource(np, 0, &res);
+	if (ret)
+		goto out;
+
+	priv->irq = irq_of_parse_and_map(np, 0);
+	if (priv->irq == NO_IRQ) {
+		printk(KERN_ERR "mpc83xx-gtm exists in device tree "
+		                "without an IRQ.\n");
+		ret = -ENODEV;
+		goto out;
+	}
+
+	ret = request_irq(priv->irq, fsl_gtm_isr, 0, "gtm timer", priv);
+	if (ret)
+		goto out;
+
+	priv->regs = ioremap(res.start, sizeof(struct gtm_regs));
+	if (!priv->regs) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	/* Disable the unused clocks to save power. */
+	out_8(&priv->regs->cfr1, CFR1_STP1 | CFR1_STP2);
+	out_8(&priv->regs->cfr2, CFR2_STP3 | CFR2_STP4);
+
+	/*
+	 * Maximum prescaling is used (input clock/16, 256 primary prescaler,
+	 * 256 secondary prescaler) to maximize the timer's range.  With a
+	 * bus clock of 133MHz, this yields a maximum interval of 516
+	 * seconds while retaining subsecond precision.  Since only
+	 * timer 4 is supported for wakeup on the 8313, and timer 4
+	 * is the LSB when chained, we can't use chaining to increase
+	 * the range.
+	 */
+	priv->ticks_per_sec = busfreq / (16*256*256);
+
+	ret = device_create_file(&dev->dev, &dev_attr_timeout);
+	if (ret)
+		goto out;
+
+	return 0;
+
+out:
+	kfree(priv);
+	return ret;
+}
+
+static int __devexit gtm_remove(struct of_device *dev)
+{
+	struct gtm_priv *priv = dev_get_drvdata(&dev->dev);
+
+	device_remove_file(&dev->dev, &dev_attr_timeout);
+	free_irq(priv->irq, priv);
+	iounmap(priv->regs);
+
+	dev_set_drvdata(&dev->dev, NULL);
+	kfree(priv);
+	return 0;
+}
+
+static struct of_device_id gtm_match[] = {
+	{
+		.compatible = "fsl,mpc83xx-gtm",
+	},
+	{},
+};
+
+static struct of_platform_driver gtm_driver = {
+	.name = "mpc83xx-gtm-timer",
+	.match_table = gtm_match,
+	.probe = gtm_probe,
+	.remove = __devexit_p(gtm_remove)
+};
+
+static int __init gtm_init(void)
+{
+	return of_register_platform_driver(&gtm_driver);
+}
+
+static void __exit gtm_exit(void)
+{
+	of_unregister_platform_driver(&gtm_driver);
+}
+
+module_init(gtm_init);
+module_exit(gtm_exit);

@@ -75,3 +75,9 @@ config PPC_MPC836x
 	select PPC_UDBG_16550
 	select PPC_INDIRECT_PCI
 	default y if MPC836x_MDS
+
+config PPC_83xx_PM
+	bool
+	default y
+	depends on PPC_83xx && PM
+	select PPC32_SUSPEND

@@ -3,6 +3,7 @@
 #
 obj-y				:= misc.o usb.o
 obj-$(CONFIG_PCI)		+= pci.o
+obj-$(CONFIG_PM)		+= pm.o sleep.o
 obj-$(CONFIG_MPC8313_RDB)	+= mpc8313_rdb.o
 obj-$(CONFIG_MPC832x_RDB)	+= mpc832x_rdb.o
 obj-$(CONFIG_MPC834x_MDS)	+= mpc834x_mds.o

@@ -0,0 +1,431 @@
+/*
+ * MPC83xx Power Management support
+ *
+ * Author: Scott Wood <scottwood@freescale.com>
+ *
+ * Copyright (c) 2006-2007 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/pm.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+#include <linux/interrupt.h>
+#include <linux/wait.h>
+#include <linux/kthread.h>
+#include <linux/freezer.h>
+#include <linux/fsl_devices.h>
+
+#include <asm/prom.h>
+#include <asm/reg.h>
+#include <asm/io.h>
+#include <asm/time.h>
+#include <asm/of_platform.h>
+#include <asm/mpc6xx.h>
+
+#include <sysdev/fsl_soc.h>
+
+#define PMCCR1_NEXT_STATE       0x0C /* Next state for power management */
+#define PMCCR1_NEXT_STATE_SHIFT 2
+#define PMCCR1_CURR_STATE       0x03 /* Current state for power management*/
+#define IMMR_RCW_OFFSET         0x900
+#define RCW_PCI_HOST            0x80000000
+
+void mpc83xx_enter_deep_sleep(phys_addr_t immrbase);
+
+struct mpc83xx_pmc {
+	u32 config;
+#define PMCCR_DLPEN 2 /* DDR SDRAM low power enable */
+#define PMCCR_SLPEN 1 /* System low power enable */
+
+	u32 event;
+	u32 mask;
+/* All but PMCI are deep-sleep only */
+#define PMCER_GPIO   0x100
+#define PMCER_PCI    0x080
+#define PMCER_USB    0x040
+#define PMCER_ETSEC1 0x020
+#define PMCER_ETSEC2 0x010
+#define PMCER_TIMER  0x008
+#define PMCER_INT1   0x004
+#define PMCER_INT2   0x002
+#define PMCER_PMCI   0x001
+#define PMCER_ALL    0x1FF
+
+	/* deep-sleep only */
+	u32 config1;
+#define PMCCR1_USE_STATE  0x80000000
+#define PMCCR1_PME_EN     0x00000080
+#define PMCCR1_ASSERT_PME 0x00000040
+#define PMCCR1_POWER_OFF  0x00000020
+
+	/* deep-sleep only */
+	u32 config2;
+};
+
+struct mpc83xx_rcw {
+	u32 rcwlr;
+	u32 rcwhr;
+};
+
+struct mpc83xx_clock {
+	u32 spmr;
+	u32 occr;
+	u32 sccr;
+};
+
+struct pmc_type {
+	int has_deep_sleep;
+};
+
+static struct of_device *pmc_dev;
+static int has_deep_sleep, deep_sleeping;
+static int pmc_irq;
+static struct mpc83xx_pmc __iomem *pmc_regs;
+static struct mpc83xx_clock __iomem *clock_regs;
+static int is_pci_agent, wake_from_pci;
+static phys_addr_t immrbase;
+static int pci_pm_state;
+static DECLARE_WAIT_QUEUE_HEAD(agent_wq);
+
+static u32 saved_sccr;
+static DEFINE_SPINLOCK(device_sleep_lock);
+
+void fsl_sleep_device(struct fsl_sleep_platform_data *data)
+{
+	if (clock_regs && data->sccr_mask) {
+		unsigned long flags;
+		u32 sccr;
+
+		spin_lock_irqsave(&device_sleep_lock, flags);
+		sccr = in_be32(&clock_regs->sccr);
+
+		saved_sccr &= ~data->sccr_mask;
+		saved_sccr |= sccr & data->sccr_mask;
+
+		out_be32(&clock_regs->sccr, sccr & ~data->sccr_mask);
+		spin_unlock_irqrestore(&device_sleep_lock, flags);
+	}
+}
+EXPORT_SYMBOL(fsl_sleep_device);
+
+void fsl_wake_device(struct fsl_sleep_platform_data *data)
+{
+	if (clock_regs && data->sccr_mask) {
+		unsigned long flags;
+		u32 sccr;
+
+		spin_lock_irqsave(&device_sleep_lock, flags);
+
+		sccr = in_be32(&clock_regs->sccr);
+		sccr |= saved_sccr & data->sccr_mask;
+		out_be32(&clock_regs->sccr, sccr);
+
+		spin_unlock_irqrestore(&device_sleep_lock, flags);
+	}
+}
+EXPORT_SYMBOL(fsl_wake_device);
+
+int fsl_deep_sleep(void)
+{
+	return deep_sleeping;
+}
+
+static int mpc83xx_change_state(void)
+{
+	u32 curr_state;
+	u32 reg_cfg1 = in_be32(&pmc_regs->config1);
+
+	if (is_pci_agent) {
+		pci_pm_state = (reg_cfg1 & PMCCR1_NEXT_STATE) >>
+		               PMCCR1_NEXT_STATE_SHIFT;
+		curr_state = reg_cfg1 & PMCCR1_CURR_STATE;
+
+		if (curr_state != pci_pm_state) {
+			reg_cfg1 &= ~PMCCR1_CURR_STATE;
+			reg_cfg1 |= pci_pm_state;
+			out_be32(&pmc_regs->config1, reg_cfg1);
+
+			wake_up(&agent_wq);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static irqreturn_t pmc_irq_handler(int irq, void *dev_id)
+{
+	u32 event = in_be32(&pmc_regs->event);
+	int ret = IRQ_NONE;
+
+	if (mpc83xx_change_state())
+		ret = IRQ_HANDLED;
+
+	if (event) {
+		out_be32(&pmc_regs->event, event);
+		ret = IRQ_HANDLED;
+	}
+
+	return ret;
+}
+
+static int mpc83xx_pm_suspend(void)
+{
+	int ret = -EAGAIN;
+
+	/* Don't go to sleep if there's a race where pci_pm_state changes
+	 * between the agent thread checking it and the PM code disabling
+	 * interrupts.
+	 */
+	if (wake_from_pci) {
+		if (pci_pm_state != (deep_sleeping ? 3 : 2))
+			goto out;
+
+		out_be32(&pmc_regs->config1,
+		         in_be32(&pmc_regs->config1) | PMCCR1_PME_EN);
+	}
+
+	/* Put the system into low-power mode and the RAM
+	 * into self-refresh mode once the core goes to
+	 * sleep.
+	 */
+
+	out_be32(&pmc_regs->config, PMCCR_SLPEN | PMCCR_DLPEN);
+
+	/* If it has deep sleep (i.e. it's an 831x or compatible),
+	 * disable power to the core upon entering sleep mode.  This will
+	 * require going through the boot firmware upon a wakeup event.
+	 */
+
+	if (deep_sleeping) {
+		out_be32(&pmc_regs->mask, PMCER_ALL);
+
+		out_be32(&pmc_regs->config1,
+		         in_be32(&pmc_regs->config1) | PMCCR1_POWER_OFF);
+
+		enable_kernel_fp();
+
+		mpc83xx_enter_deep_sleep(immrbase);
+
+		out_be32(&pmc_regs->config1,
+		         in_be32(&pmc_regs->config1) & ~PMCCR1_POWER_OFF);
+
+		out_be32(&pmc_regs->mask, PMCER_PMCI);
+
+		deep_sleeping = 0;
+	} else {
+		out_be32(&pmc_regs->mask, PMCER_PMCI);
+
+		mpc6xx_enter_sleep();
+	}
+
+	ret = 0;
+
+out:
+	out_be32(&pmc_regs->config1,
+	         in_be32(&pmc_regs->config1) & ~PMCCR1_PME_EN);
+
+	return ret;
+}
+
+static int mpc83xx_pm_valid(suspend_state_t state)
+{
+	return state == PM_SUSPEND_STANDBY || state == PM_SUSPEND_MEM;
+}
+
+static int mpc83xx_pm_prepare(suspend_state_t state)
+{
+	switch (state) {
+		case PM_SUSPEND_STANDBY:
+			deep_sleeping = 0;
+			return 0;
+
+		case PM_SUSPEND_MEM:
+			if (has_deep_sleep)
+				deep_sleeping = 1;
+
+			return 0;
+
+		default:
+			return -EINVAL;
+	}
+}
+
+static int mpc83xx_pm_enter(suspend_state_t state)
+{
+	switch (state) {
+		case PM_SUSPEND_STANDBY:
+		case PM_SUSPEND_MEM:
+			return mpc83xx_pm_suspend();
+
+		default:
+			return -EINVAL;
+	}
+}
+
+static int agent_thread_fn(void *data)
+{
+	while (1) {
+		wait_event_interruptible(agent_wq, pci_pm_state >= 2);
+		try_to_freeze();
+
+		if (signal_pending(current) || pci_pm_state < 2)
+			continue;
+
+		/* With a preemptible kernel (or SMP), this could race with a
+		 * userspace-driven suspend request.  It's probably best to
+		 * avoid mixing the two with such a configuration (or else fix
+		 * it by adding a mutex to state_store that we can synchronize
+		 * with).
+		 */
+
+		wake_from_pci = 1;
+
+		pm_suspend(pci_pm_state == 3 ? PM_SUSPEND_MEM :
+		                               PM_SUSPEND_STANDBY);
+
+		wake_from_pci = 0;
+	}
+
+	return 0;
+}
+
+void mpc83xx_set_agent(void)
+{
+	out_be32(&pmc_regs->config1, PMCCR1_USE_STATE);
+	out_be32(&pmc_regs->mask, PMCER_PMCI);
+
+	kthread_run(agent_thread_fn, NULL, "PCI power mgt");
+}
+
+static int mpc83xx_is_pci_agent(void)
+{
+	struct mpc83xx_rcw __iomem *rcw_regs;
+	int ret;
+
+	rcw_regs = ioremap(get_immrbase() + IMMR_RCW_OFFSET,
+	                   sizeof(struct mpc83xx_rcw));
+
+	if (!rcw_regs)
+		return -ENOMEM;
+
+	ret = !(in_be32(&rcw_regs->rcwhr) & RCW_PCI_HOST);
+
+	iounmap(rcw_regs);
+	return ret;
+}
+
+static struct pm_ops mpc83xx_pm_ops = {
+	.valid = mpc83xx_pm_valid,
+	.prepare = mpc83xx_pm_prepare,
+	.enter = mpc83xx_pm_enter,
+};
+
+static int pmc_probe(struct of_device *ofdev,
+                     const struct of_device_id *match)
+{
+	struct device_node *np = ofdev->node;
+	struct resource res;
+	struct pmc_type *type = match->data;
+	int ret = 0;
+
+	has_deep_sleep = type->has_deep_sleep;
+	immrbase = get_immrbase();
+	pmc_dev = ofdev;
+
+	is_pci_agent = mpc83xx_is_pci_agent();
+	if (is_pci_agent < 0)
+		return is_pci_agent;
+
+	ret = of_address_to_resource(np, 0, &res);
+	if (ret)
+		return -ENODEV;
+
+	pmc_irq = irq_of_parse_and_map(np, 0);
+	if (pmc_irq != NO_IRQ) {
+		ret = request_irq(pmc_irq, pmc_irq_handler, IRQF_SHARED,
+		                  "pmc", ofdev);
+
+		if (ret)
+			return -EBUSY;
+	}
+
+	pmc_regs = ioremap(res.start, sizeof(struct mpc83xx_pmc));
+
+	if (!pmc_regs) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = of_address_to_resource(np, 1, &res);
+	if (ret) {
+		ret = -ENODEV;
+		goto out_pmc;
+	}
+
+	clock_regs = ioremap(res.start, sizeof(struct mpc83xx_pmc));
+
+	if (!clock_regs) {
+		ret = -ENOMEM;
+		goto out_pmc;
+	}
+
+	if (is_pci_agent)
+		mpc83xx_set_agent();
+
+	pm_set_ops(&mpc83xx_pm_ops);
+	return 0;
+
+out_pmc:
+	iounmap(pmc_regs);
+out:
+	if (pmc_irq != NO_IRQ)
+		free_irq(pmc_irq, ofdev);
+
+	return ret;
+}
+
+static int pmc_remove(struct of_device *ofdev)
+{
+	return -EPERM;
+};
+
+static struct pmc_type pmc_types[] = {
+	{
+		.has_deep_sleep = 1,
+	},
+	{
+		.has_deep_sleep = 0,
+	}
+};
+
+static struct of_device_id pmc_match[] = {
+	{
+		.compatible = "fsl,mpc831x-pmc",
+		.data = &pmc_types[0],
+	},
+	{
+		.compatible = "fsl,mpc83xx-pmc",
+		.data = &pmc_types[1],
+	},
+	{}
+};
+
+static struct of_platform_driver pmc_driver = {
+	.name = "mpc83xx-pmc",
+	.match_table = pmc_match,
+	.probe = pmc_probe,
+	.remove = pmc_remove
+};
+
+static int pmc_init(void)
+{
+	return of_register_platform_driver(&pmc_driver);
+}
+
+module_init(pmc_init);

@@ -0,0 +1,296 @@
+/*
+ * Enter and leave sleep state on MPC83xx
+ *
+ * Author: Scott Wood <scottwood@freescale.com>
+ *
+ * Copyright (c) 2006 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ */
+
+#include <asm/page.h>
+#include <asm/ppc_asm.h>
+#include <asm/reg.h>
+#include <asm/asm-offsets.h>
+
+#define SS_MEMSAVE	0x00
+#define SS_HID		0x08 /* 3 HIDs */
+#define SS_IABR		0x14 /* 2 IABRs */
+#define SS_IBCR		0x1c
+#define SS_DABR		0x20 /* 2 DABRs */
+#define SS_DBCR		0x28
+#define SS_SR		0x2c /* 16 sgement registers */
+#define STATE_SAVE_SIZE 0x6c
+
+	.section .data
+	.align	5
+
+mpc83xx_sleep_save_area:
+	.space	STATE_SAVE_SIZE
+immrbase:
+	.long	0
+
+	.section .text
+	.align	5
+
+	/* r3 = physical address of IMMR */
+_GLOBAL(mpc83xx_enter_deep_sleep)
+	/* Re-use the state saving/restoring code in
+	 * arch/powerpc/kernel/swsusp_32.S, but have
+	 * it call us instead of swsusp_save.
+	 */
+
+	lis	r4, immrbase@ha
+	stw	r3, immrbase@l(r4)
+
+	lis	r3, mpc83xx_do_enter_deep_sleep@h
+	ori	r3, r3, mpc83xx_do_enter_deep_sleep@l
+	b	do_suspend
+
+mpc83xx_do_enter_deep_sleep:
+	/* The first 2 words of memory are used to communicate with the
+	 * bootloader, to tell it how to resume.
+	 *
+	 * The first word is the magic number 0xf5153ae5, and the second
+	 * is the pointer to mpc83xx_deep_resume.
+	 *
+	 * The original content of these two words is saved in the state
+	 * save area.
+	 */
+
+	lis	r3, mpc83xx_sleep_save_area@h
+	ori	r3, r3, mpc83xx_sleep_save_area@l
+
+	lis	r4, KERNELBASE@h
+	lwz	r5, 0(r4)
+	lwz	r6, 4(r4)
+
+	stw	r5, SS_MEMSAVE+0(r3)
+	stw	r6, SS_MEMSAVE+4(r3)
+
+	mfspr	r5, SPRN_HID0
+	mfspr	r6, SPRN_HID1
+	mfspr	r7, SPRN_HID2
+
+	stw	r5, SS_HID+0(r3)
+	stw	r6, SS_HID+4(r3)
+	stw	r7, SS_HID+8(r3)
+
+	mfspr	r4, SPRN_IABR
+	mfspr	r5, SPRN_IABR2
+	mfspr	r6, SPRN_IBCR
+	mfspr	r7, SPRN_DABR
+	mfspr	r8, SPRN_DABR2
+	mfspr	r9, SPRN_DBCR
+
+	stw	r4, SS_IABR+0(r3)
+	stw	r5, SS_IABR+4(r3)
+	stw	r6, SS_IBCR(r3)
+	stw	r7, SS_DABR+0(r3)
+	stw	r8, SS_DABR+4(r3)
+	stw	r9, SS_DBCR(r3)
+
+	li	r4, 0
+	addi	r6, r3, SS_SR-4
+1:	mfsrin	r5, r4
+	stwu	r5, 4(r6)
+	addis	r4, r4, 0x1000
+	cmpwi	r4, 0
+	bne	1b
+
+
+	bl	__flush_disable_L1
+
+	/* Disable machine checks and critical exceptions */
+	mfmsr	r4
+	rlwinm	r4, r4, 0, ~MSR_CE
+	rlwinm	r4, r4, 0, ~MSR_ME
+	mtmsr	r4
+	isync
+
+	mfspr	r3, SPRN_HID0
+	ori	r3, r3, HID0_ICE
+	ori	r4, r3, HID0_ICFI
+	isync
+	mtspr	SPRN_HID0, r4
+	mtspr	SPRN_HID0, r3
+	isync
+
+#define TMP_VIRT_IMMR		0xf0000000
+#define DEFAULT_IMMR_VALUE	0xff400000
+#define IMMRBAR_BASE		0x0000
+
+	lis	r4, immrbase@ha
+	lwz	r4, immrbase@l(r4)
+
+	/* Use DBAT0 to address the current IMMR space */
+
+	ori	r4, r4, 0x002a
+	mtspr	SPRN_DBAT0L, r4
+	lis	r8, TMP_VIRT_IMMR@h
+	ori	r4, r8, 0x001e	/* 1 MByte accessable from Kernel Space only */
+	mtspr	SPRN_DBAT0U, r4
+	isync
+
+	/* Use DBAT1 to address the original IMMR space */
+
+	lis	r4, DEFAULT_IMMR_VALUE@h
+	ori	r4, r4, 0x002a
+	mtspr	SPRN_DBAT1L, r4
+	lis	r9, (TMP_VIRT_IMMR + 0x01000000)@h
+	ori	r4, r9, 0x001e	/* 1 MByte accessable from Kernel Space only */
+	mtspr	SPRN_DBAT1U, r4
+	isync
+
+	/* Use DBAT2 to address the beginning of RAM.  This isn't done
+	 * using the normal virtual mapping, because with page debugging
+	 * enabled it will be read-only. */
+
+	li	r4, 0x002a
+	mtspr	SPRN_DBAT2L, r4
+	lis	r4, KERNELBASE@h
+	ori	r4, r4, 0x001e	/* 1 MByte accessable from Kernel Space only */
+	mtspr	SPRN_DBAT2U, r4
+	isync
+
+	lis	r6, 0xf515
+	ori	r6, r6, 0x3ae5
+
+	lis	r7, mpc83xx_deep_resume@h
+	ori	r7, r7, mpc83xx_deep_resume@l
+	tophys(r7, r7)
+
+	lis	r5, KERNELBASE@h
+	stw	r6, 0(r5)
+	stw	r7, 4(r5)
+
+	/* Reset BARs */
+
+	li	r4, 0
+	stw	r4, 0x0024(r8)
+	stw	r4, 0x002c(r8)
+	stw	r4, 0x0034(r8)
+	stw	r4, 0x003c(r8)
+	stw	r4, 0x0064(r8)
+	stw	r4, 0x006c(r8)
+
+	/* The 8313 has problems with wakeup events that are pending
+	 * during the transition to deep sleep state (such as if the PCI
+	 * host sets the state to D3 and then D0 in rapid succession).
+	 * This check shrinks the race window somewhat.
+	 */
+
+	lwz	r3, 0x0b04(r8)
+	andi.	r3, r3, 1
+	bne-	mpc83xx_deep_resume
+
+	/* Move IMMR back to the default location, following the
+	 * procedure specified in the MPC8313 manual.
+	 */
+	lwz	r4, IMMRBAR_BASE(r8)
+	isync
+	lis	r4, DEFAULT_IMMR_VALUE@h
+	stw	r4, IMMRBAR_BASE(r8)
+	lis	r4, KERNELBASE@h
+	lwz	r4, 0(r4)
+	isync
+	lwz	r4, IMMRBAR_BASE(r9)
+	mr	r8, r9
+	isync
+
+	/* Check the Reset Configuration Word to see whether flash needs
+	 * to be mapped at a low address or a high address.
+	 */
+
+	lwz	r4, 0x0904(r8)
+	andis.	r4, r4, 0x0400
+	li	r4, 0
+	beq	boot_low
+	lis	r4, 0xff80
+boot_low:
+	stw	r4, 0x0020(r8)
+	lis	r7, 0x8000
+	ori	r7, r7, 0x0016
+
+	mfspr	r5, SPRN_HID0
+	rlwinm	r5, r5, 0, ~(HID0_DOZE | HID0_NAP)
+	oris	r5, r5, HID0_SLEEP@h
+	mtspr	SPRN_HID0, r5
+	isync
+
+	mfmsr	r5
+	oris	r5, r5, MSR_POW@h
+
+	/* Enable the flash mapping at the appropriate address.  This
+	 * mapping will override the RAM mapping, so there's no need to
+	 * disable the latter.  This must be done inside the same cache
+	 * line as setting MSR_POW, so that no instruction fetches from
+	 * RAM happen after the flash mapping is turned on.
+	 */
+
+	.align	5
+	stw	r7, 0x0024(r8)
+	sync
+	isync
+	mtmsr	r5
+	isync
+1:	b	1b
+
+mpc83xx_deep_resume:
+	lis	r4, 1f@h
+	ori	r4, r4, 1f@l
+	tophys(r4, r4)
+	mtsrr0	r4
+
+	mfmsr	r4
+	rlwinm	r4, r4, 0, ~(MSR_IR | MSR_DR)
+	mtsrr1	r4
+
+	rfi
+1:	bl	__inval_enable_L1
+
+	lis	r3, mpc83xx_sleep_save_area@h
+	ori	r3, r3, mpc83xx_sleep_save_area@l
+	tophys(r3, r3)
+
+	lwz	r5, SS_MEMSAVE+0(r3)
+	lwz	r6, SS_MEMSAVE+4(r3)
+
+	stw	r5, 0(0)
+	stw	r6, 4(0)
+
+	lwz	r5, SS_HID+0(r3)
+	lwz	r6, SS_HID+4(r3)
+	lwz	r7, SS_HID+8(r3)
+
+	mtspr	SPRN_HID0, r5
+	mtspr	SPRN_HID1, r6
+	mtspr	SPRN_HID2, r7
+
+	lwz	r4, SS_IABR+0(r3)
+	lwz	r5, SS_IABR+4(r3)
+	lwz	r6, SS_IBCR(r3)
+	lwz	r7, SS_DABR+0(r3)
+	lwz	r8, SS_DABR+4(r3)
+	lwz	r9, SS_DBCR(r3)
+
+	mtspr	SPRN_IABR, r4
+	mtspr	SPRN_IABR2, r5
+	mtspr	SPRN_IBCR, r6
+	mtspr	SPRN_DABR, r7
+	mtspr	SPRN_DABR2, r8
+	mtspr	SPRN_DBCR, r9
+
+	li	r4, 0
+	addi	r6, r3, SS_SR-4
+1:	lwzu	r5, 4(r6)
+	mtsrin	r5, r4
+	addis	r4, r4, 0x1000
+	cmpwi	r4, 0
+	bne	1b
+
+	li	r3, 1		/* BAT restore requested */
+	b	do_resume
+