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/*
* i.MX27 Power Management Routines
*
* Based on Freescale's BSP
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License.
*/
#include <linux/kernel.h>
#include <linux/suspend.h>
#include <linux/io.h>
#include <mach/system.h>
#include <mach/mx27.h>
static int mx27_suspend_enter(suspend_state_t state)
{
u32 cscr;
switch (state) {
case PM_SUSPEND_MEM:
/* Clear MPEN and SPEN to disable MPLL/SPLL */
cscr = __raw_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
cscr &= 0xFFFFFFFC;
__raw_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
/* Executes WFI */
arch_idle();
break;
default:
return -EINVAL;
}
return 0;
}
static const struct platform_suspend_ops mx27_suspend_ops = {
.enter = mx27_suspend_enter,
.valid = suspend_valid_only_mem,
};
static int __init mx27_pm_init(void)
{
if (!cpu_is_mx27())
return 0;
suspend_set_ops(&mx27_suspend_ops);
return 0;
}
device_initcall(mx27_pm_init);
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