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/*
* Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
*/
/*
* The code contained herein is licensed under the GNU General Public
* License. You may obtain a copy of the GNU General Public License
* Version 2 or later at the following locations:
*
* http://www.opensource.org/licenses/gpl-license.html
* http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/kernel.h>
#include <linux/suspend.h>
#include <mach/hardware.h>
/*!
* @defgroup MSL_MX35 i.MX35 Machine Specific Layer (MSL)
*/
int suspend_ops_started;
int is_suspend_ops_started(void)
{
return suspend_ops_started;
}
/*!
* @file mach-mx35/pm.c
* @brief This file contains suspend operations
*
* @ingroup MSL_MX35
*/
static int mx35_suspend_enter(suspend_state_t state)
{
switch (state) {
case PM_SUSPEND_MEM:
mxc_cpu_lp_set(STOP_POWER_OFF);
break;
case PM_SUSPEND_STANDBY:
mxc_cpu_lp_set(STOP_POWER_ON);
break;
default:
return -EINVAL;
}
/* Executing CP15 (Wait-for-Interrupt) Instruction */
cpu_do_idle();
return 0;
}
/*
* Called after processes are frozen, but before we shut down devices.
*/
static int mx35_suspend_prepare(void)
{
suspend_ops_started = 1;
return 0;
}
/*
* Called after devices are re-setup, but before processes are thawed.
*/
static void mx35_suspend_finish(void)
{
suspend_ops_started = 0;
}
static int mx35_pm_valid(suspend_state_t state)
{
return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
}
struct platform_suspend_ops mx35_suspend_ops = {
.valid = mx35_pm_valid,
.prepare = mx35_suspend_prepare,
.enter = mx35_suspend_enter,
.finish = mx35_suspend_finish,
};
static int __init mx35_pm_init(void)
{
pr_info("Static Power Management for Freescale i.MX35\n");
suspend_set_ops(&mx35_suspend_ops);
return 0;
}
late_initcall(mx35_pm_init);
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