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/*
* 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 const 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);
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