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/*
* Copyright (C) 2009-2010 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 <linux/io.h>
#include <mach/hardware.h>
#include "crm_regs.h"
/*!
* @defgroup MSL_MX25 i.MX25 Machine Specific Layer (MSL)
*/
/*!
* @file mach-mx25/pm.c
* @brief This file contains suspend operations
*
* @ingroup MSL_MX25
*/
static unsigned int cgcr0, cgcr1, cgcr2;
static int mx25_suspend_enter(suspend_state_t state)
{
unsigned int reg;
switch (state) {
case PM_SUSPEND_MEM:
mxc_cpu_lp_set(STOP_POWER_OFF);
break;
case PM_SUSPEND_STANDBY:
mxc_cpu_lp_set(WAIT_UNCLOCKED_POWER_OFF);
break;
default:
return -EINVAL;
}
/* Executing CP15 (Wait-for-Interrupt) Instruction */
cpu_do_idle();
reg = (__raw_readl(MXC_CCM_CGCR0) & ~MXC_CCM_CGCR0_STOP_MODE_MASK) |
cgcr0;
__raw_writel(reg, MXC_CCM_CGCR0);
reg = (__raw_readl(MXC_CCM_CGCR1) & ~MXC_CCM_CGCR1_STOP_MODE_MASK) |
cgcr1;
__raw_writel(reg, MXC_CCM_CGCR1);
reg = (__raw_readl(MXC_CCM_CGCR2) & ~MXC_CCM_CGCR2_STOP_MODE_MASK) |
cgcr2;
__raw_writel(reg, MXC_CCM_CGCR2);
return 0;
}
/*
* Called after processes are frozen, but before we shut down devices.
*/
static int mx25_suspend_prepare(void)
{
cgcr0 = __raw_readl(MXC_CCM_CGCR0) & MXC_CCM_CGCR0_STOP_MODE_MASK;
cgcr1 = __raw_readl(MXC_CCM_CGCR1) & MXC_CCM_CGCR1_STOP_MODE_MASK;
cgcr2 = __raw_readl(MXC_CCM_CGCR2) & MXC_CCM_CGCR2_STOP_MODE_MASK;
return 0;
}
/*
* Called after devices are re-setup, but before processes are thawed.
*/
static void mx25_suspend_finish(void)
{
}
static int mx25_pm_valid(suspend_state_t state)
{
return state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX;
}
struct platform_suspend_ops mx25_suspend_ops = {
.valid = mx25_pm_valid,
.prepare = mx25_suspend_prepare,
.enter = mx25_suspend_enter,
.finish = mx25_suspend_finish,
};
static int __init mx25_pm_init(void)
{
pr_info("Static Power Management for Freescale i.MX25\n");
suspend_set_ops(&mx25_suspend_ops);
return 0;
}
late_initcall(mx25_pm_init);
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