arch/arm/mach-omap2/pm44xx.c - kernel/windcharger - Git at Google

 /*
  * OMAP4 Power Management Routines
  *
  * Copyright (C) 2010-2011 Texas Instruments, Inc.
  * Rajendra Nayak <rnayak@ti.com>
  * Santosh Shilimkar <santosh.shilimkar@ti.com>
  *
  * 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/pm.h>
 #include <linux/suspend.h>
 #include <linux/module.h>
 #include <linux/list.h>
 #include <linux/err.h>
 #include <linux/slab.h>

 #include "common.h"
 #include "clockdomain.h"
 #include "powerdomain.h"
 #include "pm.h"

 struct power_state {
 	struct powerdomain *pwrdm;
 	u32 next_state;
 #ifdef CONFIG_SUSPEND
 	u32 saved_state;
 	u32 saved_logic_state;
 #endif
 	struct list_head node;
 };

 static LIST_HEAD(pwrst_list);

 #ifdef CONFIG_SUSPEND
 static int omap4_pm_suspend(void)
 {
 	struct power_state *pwrst;
 	int state, ret = 0;
 	u32 cpu_id = smp_processor_id();

 	/* Save current powerdomain state */
 	list_for_each_entry(pwrst, &pwrst_list, node) {
 		pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
 		pwrst->saved_logic_state = pwrdm_read_logic_retst(pwrst->pwrdm);
 	}

 	/* Set targeted power domain states by suspend */
 	list_for_each_entry(pwrst, &pwrst_list, node) {
 		omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
 		pwrdm_set_logic_retst(pwrst->pwrdm, PWRDM_POWER_OFF);
 	}

 	/*
 	 * For MPUSS to hit power domain retention(CSWR or OSWR),
 	 * CPU0 and CPU1 power domains need to be in OFF or DORMANT state,
 	 * since CPU power domain CSWR is not supported by hardware
 	 * Only master CPU follows suspend path. All other CPUs follow
 	 * CPU hotplug path in system wide suspend. On OMAP4, CPU power
 	 * domain CSWR is not supported by hardware.
 	 * More details can be found in OMAP4430 TRM section 4.3.4.2.
 	 */
 	omap4_enter_lowpower(cpu_id, PWRDM_POWER_OFF);

 	/* Restore next powerdomain state */
 	list_for_each_entry(pwrst, &pwrst_list, node) {
 		state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
 		if (state > pwrst->next_state) {
 			pr_info("Powerdomain (%s) didn't enter "
 			       "target state %d\n",
 			       pwrst->pwrdm->name, pwrst->next_state);
 			ret = -1;
 		}
 		omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
 		pwrdm_set_logic_retst(pwrst->pwrdm, pwrst->saved_logic_state);
 	}
 	if (ret)
 		pr_crit("Could not enter target state in pm_suspend\n");
 	else
 		pr_info("Successfully put all powerdomains to target state\n");

 	return 0;
 }

 static int omap4_pm_enter(suspend_state_t suspend_state)
 {
 	int ret = 0;

 	switch (suspend_state) {
 	case PM_SUSPEND_STANDBY:
 	case PM_SUSPEND_MEM:
 		ret = omap4_pm_suspend();
 		break;
 	default:
 		ret = -EINVAL;
 	}

 	return ret;
 }

 static int omap4_pm_begin(suspend_state_t state)
 {
 	disable_hlt();
 	return 0;
 }

 static void omap4_pm_end(void)
 {
 	enable_hlt();
 	return;
 }

 static const struct platform_suspend_ops omap_pm_ops = {
 	.begin		= omap4_pm_begin,
 	.end		= omap4_pm_end,
 	.enter		= omap4_pm_enter,
 	.valid		= suspend_valid_only_mem,
 };
 #endif /* CONFIG_SUSPEND */

 /*
  * Enable hardware supervised mode for all clockdomains if it's
  * supported. Initiate sleep transition for other clockdomains, if
  * they are not used
  */
 static int __init clkdms_setup(struct clockdomain *clkdm, void *unused)
 {
 	if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
 		clkdm_allow_idle(clkdm);
 	else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
 			atomic_read(&clkdm->usecount) == 0)
 		clkdm_sleep(clkdm);
 	return 0;
 }


 static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)
 {
 	struct power_state *pwrst;

 	if (!pwrdm->pwrsts)
 		return 0;

 	/*
 	 * Skip CPU0 and CPU1 power domains. CPU1 is programmed
 	 * through hotplug path and CPU0 explicitly programmed
 	 * further down in the code path
 	 */
 	if (!strncmp(pwrdm->name, "cpu", 3))
 		return 0;

 	/*
 	 * FIXME: Remove this check when core retention is supported
 	 * Only MPUSS power domain is added in the list.
 	 */
 	if (strcmp(pwrdm->name, "mpu_pwrdm"))
 		return 0;

 	pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
 	if (!pwrst)
 		return -ENOMEM;

 	pwrst->pwrdm = pwrdm;
 	pwrst->next_state = PWRDM_POWER_RET;
 	list_add(&pwrst->node, &pwrst_list);

 	return omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
 }

 /**
  * omap_default_idle - OMAP4 default ilde routine.'
  *
  * Implements OMAP4 memory, IO ordering requirements which can't be addressed
  * with default arch_idle() hook. Used by all CPUs with !CONFIG_CPUIDLE and
  * by secondary CPU with CONFIG_CPUIDLE.
  */
 static void omap_default_idle(void)
 {
 	local_irq_disable();
 	local_fiq_disable();

 	omap_do_wfi();

 	local_fiq_enable();
 	local_irq_enable();
 }

 /**
  * omap4_pm_init - Init routine for OMAP4 PM
  *
  * Initializes all powerdomain and clockdomain target states
  * and all PRCM settings.
  */
 static int __init omap4_pm_init(void)
 {
 	int ret;
 	struct clockdomain *emif_clkdm, *mpuss_clkdm, *l3_1_clkdm;
 	struct clockdomain *ducati_clkdm, *l3_2_clkdm, *l4_per_clkdm;

 	if (!cpu_is_omap44xx())
 		return -ENODEV;

 	if (omap_rev() == OMAP4430_REV_ES1_0) {
 		WARN(1, "Power Management not supported on OMAP4430 ES1.0\n");
 		return -ENODEV;
 	}

 	pr_err("Power Management for TI OMAP4.\n");

 	ret = pwrdm_for_each(pwrdms_setup, NULL);
 	if (ret) {
 		pr_err("Failed to setup powerdomains\n");
 		goto err2;
 	}

 	/*
 	 * The dynamic dependency between MPUSS -> MEMIF and
 	 * MPUSS -> L4_PER/L3_* and DUCATI -> L3_* doesn't work as
 	 * expected. The hardware recommendation is to enable static
 	 * dependencies for these to avoid system lock ups or random crashes.
 	 */
 	mpuss_clkdm = clkdm_lookup("mpuss_clkdm");
 	emif_clkdm = clkdm_lookup("l3_emif_clkdm");
 	l3_1_clkdm = clkdm_lookup("l3_1_clkdm");
 	l3_2_clkdm = clkdm_lookup("l3_2_clkdm");
 	l4_per_clkdm = clkdm_lookup("l4_per_clkdm");
 	ducati_clkdm = clkdm_lookup("ducati_clkdm");
 	if ((!mpuss_clkdm) || (!emif_clkdm) || (!l3_1_clkdm) ||
 		(!l3_2_clkdm) || (!ducati_clkdm) || (!l4_per_clkdm))
 		goto err2;

 	ret = clkdm_add_wkdep(mpuss_clkdm, emif_clkdm);
 	ret |= clkdm_add_wkdep(mpuss_clkdm, l3_1_clkdm);
 	ret |= clkdm_add_wkdep(mpuss_clkdm, l3_2_clkdm);
 	ret |= clkdm_add_wkdep(mpuss_clkdm, l4_per_clkdm);
 	ret |= clkdm_add_wkdep(ducati_clkdm, l3_1_clkdm);
 	ret |= clkdm_add_wkdep(ducati_clkdm, l3_2_clkdm);
 	if (ret) {
 		pr_err("Failed to add MPUSS -> L3/EMIF/L4PER, DUCATI -> L3 "
 				"wakeup dependency\n");
 		goto err2;
 	}

 	ret = omap4_mpuss_init();
 	if (ret) {
 		pr_err("Failed to initialise OMAP4 MPUSS\n");
 		goto err2;
 	}

 	(void) clkdm_for_each(clkdms_setup, NULL);

 #ifdef CONFIG_SUSPEND
 	suspend_set_ops(&omap_pm_ops);
 #endif /* CONFIG_SUSPEND */

 	/* Overwrite the default arch_idle() */
 	pm_idle = omap_default_idle;

 	omap4_idle_init();

 err2:
 	return ret;
 }
 late_initcall(omap4_pm_init);
	/*
	* OMAP4 Power Management Routines
	*
	* Copyright (C) 2010-2011 Texas Instruments, Inc.
	* Rajendra Nayak <rnayak@ti.com>
	* Santosh Shilimkar <santosh.shilimkar@ti.com>
	*
	* 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/pm.h>
	#include <linux/suspend.h>
	#include <linux/module.h>
	#include <linux/list.h>
	#include <linux/err.h>
	#include <linux/slab.h>

	#include "common.h"
	#include "clockdomain.h"
	#include "powerdomain.h"
	#include "pm.h"

	struct power_state {
	struct powerdomain *pwrdm;
	u32 next_state;
	#ifdef CONFIG_SUSPEND
	u32 saved_state;
	u32 saved_logic_state;
	#endif
	struct list_head node;
	};

	static LIST_HEAD(pwrst_list);

	#ifdef CONFIG_SUSPEND
	static int omap4_pm_suspend(void)
	{
	struct power_state *pwrst;
	int state, ret = 0;
	u32 cpu_id = smp_processor_id();

	/* Save current powerdomain state */
	list_for_each_entry(pwrst, &pwrst_list, node) {
	pwrst->saved_state = pwrdm_read_next_pwrst(pwrst->pwrdm);
	pwrst->saved_logic_state = pwrdm_read_logic_retst(pwrst->pwrdm);
	}

	/* Set targeted power domain states by suspend */
	list_for_each_entry(pwrst, &pwrst_list, node) {
	omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
	pwrdm_set_logic_retst(pwrst->pwrdm, PWRDM_POWER_OFF);
	}

	/*
	* For MPUSS to hit power domain retention(CSWR or OSWR),
	* CPU0 and CPU1 power domains need to be in OFF or DORMANT state,
	* since CPU power domain CSWR is not supported by hardware
	* Only master CPU follows suspend path. All other CPUs follow
	* CPU hotplug path in system wide suspend. On OMAP4, CPU power
	* domain CSWR is not supported by hardware.
	* More details can be found in OMAP4430 TRM section 4.3.4.2.
	*/
	omap4_enter_lowpower(cpu_id, PWRDM_POWER_OFF);

	/* Restore next powerdomain state */
	list_for_each_entry(pwrst, &pwrst_list, node) {
	state = pwrdm_read_prev_pwrst(pwrst->pwrdm);
	if (state > pwrst->next_state) {
	pr_info("Powerdomain (%s) didn't enter "
	"target state %d\n",
	pwrst->pwrdm->name, pwrst->next_state);
	ret = -1;
	}
	omap_set_pwrdm_state(pwrst->pwrdm, pwrst->saved_state);
	pwrdm_set_logic_retst(pwrst->pwrdm, pwrst->saved_logic_state);
	}
	if (ret)
	pr_crit("Could not enter target state in pm_suspend\n");
	else
	pr_info("Successfully put all powerdomains to target state\n");

	return 0;
	}

	static int omap4_pm_enter(suspend_state_t suspend_state)
	{
	int ret = 0;

	switch (suspend_state) {
	case PM_SUSPEND_STANDBY:
	case PM_SUSPEND_MEM:
	ret = omap4_pm_suspend();
	break;
	default:
	ret = -EINVAL;
	}

	return ret;
	}

	static int omap4_pm_begin(suspend_state_t state)
	{
	disable_hlt();
	return 0;
	}

	static void omap4_pm_end(void)
	{
	enable_hlt();
	return;
	}

	static const struct platform_suspend_ops omap_pm_ops = {
	.begin = omap4_pm_begin,
	.end = omap4_pm_end,
	.enter = omap4_pm_enter,
	.valid = suspend_valid_only_mem,
	};
	#endif /* CONFIG_SUSPEND */

	/*
	* Enable hardware supervised mode for all clockdomains if it's
	* supported. Initiate sleep transition for other clockdomains, if
	* they are not used
	*/
	static int __init clkdms_setup(struct clockdomain clkdm, void unused)
	{
	if (clkdm->flags & CLKDM_CAN_ENABLE_AUTO)
	clkdm_allow_idle(clkdm);
	else if (clkdm->flags & CLKDM_CAN_FORCE_SLEEP &&
	atomic_read(&clkdm->usecount) == 0)
	clkdm_sleep(clkdm);
	return 0;
	}


	static int __init pwrdms_setup(struct powerdomain pwrdm, void unused)
	{
	struct power_state *pwrst;

	if (!pwrdm->pwrsts)
	return 0;

	/*
	* Skip CPU0 and CPU1 power domains. CPU1 is programmed
	* through hotplug path and CPU0 explicitly programmed
	* further down in the code path
	*/
	if (!strncmp(pwrdm->name, "cpu", 3))
	return 0;

	/*
	* FIXME: Remove this check when core retention is supported
	* Only MPUSS power domain is added in the list.
	*/
	if (strcmp(pwrdm->name, "mpu_pwrdm"))
	return 0;

	pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);
	if (!pwrst)
	return -ENOMEM;

	pwrst->pwrdm = pwrdm;
	pwrst->next_state = PWRDM_POWER_RET;
	list_add(&pwrst->node, &pwrst_list);

	return omap_set_pwrdm_state(pwrst->pwrdm, pwrst->next_state);
	}

	/**
	* omap_default_idle - OMAP4 default ilde routine.'
	*
	* Implements OMAP4 memory, IO ordering requirements which can't be addressed
	* with default arch_idle() hook. Used by all CPUs with !CONFIG_CPUIDLE and
	* by secondary CPU with CONFIG_CPUIDLE.
	*/
	static void omap_default_idle(void)
	{
	local_irq_disable();
	local_fiq_disable();

	omap_do_wfi();

	local_fiq_enable();
	local_irq_enable();
	}

	/**
	* omap4_pm_init - Init routine for OMAP4 PM
	*
	* Initializes all powerdomain and clockdomain target states
	* and all PRCM settings.
	*/
	static int __init omap4_pm_init(void)
	{
	int ret;
	struct clockdomain emif_clkdm, mpuss_clkdm, *l3_1_clkdm;
	struct clockdomain ducati_clkdm, l3_2_clkdm, *l4_per_clkdm;

	if (!cpu_is_omap44xx())
	return -ENODEV;

	if (omap_rev() == OMAP4430_REV_ES1_0) {
	WARN(1, "Power Management not supported on OMAP4430 ES1.0\n");
	return -ENODEV;
	}

	pr_err("Power Management for TI OMAP4.\n");

	ret = pwrdm_for_each(pwrdms_setup, NULL);
	if (ret) {
	pr_err("Failed to setup powerdomains\n");
	goto err2;
	}

	/*
	* The dynamic dependency between MPUSS -> MEMIF and
	* MPUSS -> L4_PER/L3_* and DUCATI -> L3_* doesn't work as
	* expected. The hardware recommendation is to enable static
	* dependencies for these to avoid system lock ups or random crashes.
	*/
	mpuss_clkdm = clkdm_lookup("mpuss_clkdm");
	emif_clkdm = clkdm_lookup("l3_emif_clkdm");
	l3_1_clkdm = clkdm_lookup("l3_1_clkdm");
	l3_2_clkdm = clkdm_lookup("l3_2_clkdm");
	l4_per_clkdm = clkdm_lookup("l4_per_clkdm");
	ducati_clkdm = clkdm_lookup("ducati_clkdm");
	if ((!mpuss_clkdm) \|\| (!emif_clkdm) \|\| (!l3_1_clkdm) \|\|
	(!l3_2_clkdm) \|\| (!ducati_clkdm) \|\| (!l4_per_clkdm))
	goto err2;

	ret = clkdm_add_wkdep(mpuss_clkdm, emif_clkdm);
	ret \|= clkdm_add_wkdep(mpuss_clkdm, l3_1_clkdm);
	ret \|= clkdm_add_wkdep(mpuss_clkdm, l3_2_clkdm);
	ret \|= clkdm_add_wkdep(mpuss_clkdm, l4_per_clkdm);
	ret \|= clkdm_add_wkdep(ducati_clkdm, l3_1_clkdm);
	ret \|= clkdm_add_wkdep(ducati_clkdm, l3_2_clkdm);
	if (ret) {
	pr_err("Failed to add MPUSS -> L3/EMIF/L4PER, DUCATI -> L3 "
	"wakeup dependency\n");
	goto err2;
	}

	ret = omap4_mpuss_init();
	if (ret) {
	pr_err("Failed to initialise OMAP4 MPUSS\n");
	goto err2;
	}

	(void) clkdm_for_each(clkdms_setup, NULL);

	#ifdef CONFIG_SUSPEND
	suspend_set_ops(&omap_pm_ops);
	#endif /* CONFIG_SUSPEND */

	/* Overwrite the default arch_idle() */
	pm_idle = omap_default_idle;

	omap4_idle_init();

	err2:
	return ret;
	}
	late_initcall(omap4_pm_init);