arch/powerpc/platforms/83xx/suspend.c - kernel/prism - Git at Google

 /*
  * MPC83xx suspend 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/suspend.h>
 #include <linux/fsl_devices.h>
 #include <linux/of_platform.h>

 #include <asm/reg.h>
 #include <asm/io.h>
 #include <asm/time.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);

 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_suspend_enter(suspend_state_t state)
 {
 	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);
 	} else {
 		out_be32(&pmc_regs->mask, PMCER_PMCI);

 		mpc6xx_enter_standby();
 	}

 	ret = 0;

 out:
 	out_be32(&pmc_regs->config1,
 	         in_be32(&pmc_regs->config1) & ~PMCCR1_PME_EN);

 	return ret;
 }

 static void mpc83xx_suspend_finish(void)
 {
 	deep_sleeping = 0;
 }

 static int mpc83xx_suspend_valid(suspend_state_t state)
 {
 	return state == PM_SUSPEND_STANDBY || state == PM_SUSPEND_MEM;
 }

 static int mpc83xx_suspend_begin(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 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;
 }

 static 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 platform_suspend_ops mpc83xx_suspend_ops = {
 	.valid = mpc83xx_suspend_valid,
 	.begin = mpc83xx_suspend_begin,
 	.enter = mpc83xx_suspend_enter,
 	.finish = mpc83xx_suspend_finish,
 };

 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;

 	if (!of_device_is_available(np))
 		return -ENODEV;

 	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();

 	suspend_set_ops(&mpc83xx_suspend_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,mpc8313-pmc",
 		.data = &pmc_types[0],
 	},
 	{
 		.compatible = "fsl,mpc8349-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);
	/*
	* MPC83xx suspend 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/suspend.h>
	#include <linux/fsl_devices.h>
	#include <linux/of_platform.h>

	#include <asm/reg.h>
	#include <asm/io.h>
	#include <asm/time.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);

	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_suspend_enter(suspend_state_t state)
	{
	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);
	} else {
	out_be32(&pmc_regs->mask, PMCER_PMCI);

	mpc6xx_enter_standby();
	}

	ret = 0;

	out:
	out_be32(&pmc_regs->config1,
	in_be32(&pmc_regs->config1) & ~PMCCR1_PME_EN);

	return ret;
	}

	static void mpc83xx_suspend_finish(void)
	{
	deep_sleeping = 0;
	}

	static int mpc83xx_suspend_valid(suspend_state_t state)
	{
	return state == PM_SUSPEND_STANDBY \|\| state == PM_SUSPEND_MEM;
	}

	static int mpc83xx_suspend_begin(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 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;
	}

	static 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 platform_suspend_ops mpc83xx_suspend_ops = {
	.valid = mpc83xx_suspend_valid,
	.begin = mpc83xx_suspend_begin,
	.enter = mpc83xx_suspend_enter,
	.finish = mpc83xx_suspend_finish,
	};

	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;

	if (!of_device_is_available(np))
	return -ENODEV;

	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();

	suspend_set_ops(&mpc83xx_suspend_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,mpc8313-pmc",
	.data = &pmc_types[0],
	},
	{
	.compatible = "fsl,mpc8349-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);