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Commit 5643aebb authored by Rajendra Nayak's avatar Rajendra Nayak Committed by Tony Lindgren
Browse files

omap4: suspend: Add basic system suspend support 



This patch adds support for basic suspend doing a CPUx wfi
for OMAP4. All powerdomains are for now are kept programmed
in ON state.

Signed-off-by: default avatarRajendra Nayak <rnayak@ti.com>
Signed-off-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: default avatarTony Lindgren <tony@atomide.com>
parent 00034509

arch/arm/mach-omap2/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ ifeq ($(CONFIG_PM),y) 
obj-$(CONFIG_ARCH_OMAP2)		+= pm24xx.o

obj-$(CONFIG_ARCH_OMAP2)		+= sleep24xx.o

obj-$(CONFIG_ARCH_OMAP3)		+= pm34xx.o sleep34xx.o cpuidle34xx.o

obj-$(CONFIG_ARCH_OMAP4)		+= pm44xx.o

obj-$(CONFIG_PM_DEBUG)			+= pm-debug.o



AFLAGS_sleep24xx.o			:=-Wa,-march=armv6

arch/arm/mach-omap2/pm44xx.c

0 → 100644
+135 −0
Original line number Diff line number Diff line 
/*

 * OMAP4 Power Management Routines

 *

 * Copyright (C) 2010 Texas Instruments, Inc.

 * Rajendra Nayak <rnayak@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 <plat/powerdomain.h>

#include <mach/omap4-common.h>



struct power_state {

	struct powerdomain *pwrdm;

	u32 next_state;

#ifdef CONFIG_SUSPEND

	u32 saved_state;

#endif

	struct list_head node;

};



static LIST_HEAD(pwrst_list);



#ifdef CONFIG_SUSPEND

static int omap4_pm_prepare(void)

{

	disable_hlt();

	return 0;

}



static int omap4_pm_suspend(void)

{

	do_wfi();

	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 void omap4_pm_finish(void)

{

	enable_hlt();

	return;

}



static int omap4_pm_begin(suspend_state_t state)

{

	return 0;

}



static void omap4_pm_end(void)

{

	return;

}



static struct platform_suspend_ops omap_pm_ops = {

	.begin		= omap4_pm_begin,

	.end		= omap4_pm_end,

	.prepare	= omap4_pm_prepare,

	.enter		= omap4_pm_enter,

	.finish		= omap4_pm_finish,

	.valid		= suspend_valid_only_mem,

};

#endif /* CONFIG_SUSPEND */



static int __init pwrdms_setup(struct powerdomain *pwrdm, void *unused)

{

	struct power_state *pwrst;



	if (!pwrdm->pwrsts)

		return 0;



	pwrst = kmalloc(sizeof(struct power_state), GFP_ATOMIC);

	if (!pwrst)

		return -ENOMEM;

	pwrst->pwrdm = pwrdm;

	pwrst->next_state = PWRDM_POWER_ON;

	list_add(&pwrst->node, &pwrst_list);



	return pwrdm_set_next_pwrst(pwrst->pwrdm, pwrst->next_state);

}



/**

 * 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;



	if (!cpu_is_omap44xx())

		return -ENODEV;



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



#ifdef CONFIG_PM

	ret = pwrdm_for_each(pwrdms_setup, NULL);

	if (ret) {

		pr_err("Failed to setup powerdomains\n");

		goto err2;

	}

#endif



#ifdef CONFIG_SUSPEND

	suspend_set_ops(&omap_pm_ops);

#endif /* CONFIG_SUSPEND */



err2:

	return ret;

}

late_initcall(omap4_pm_init);