/*
|
* 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 "hardware.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 = imx_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
|
cscr &= 0xFFFFFFFC;
|
imx_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
|
/* Executes WFI */
|
cpu_do_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,
|
};
|
|
void __init imx27_pm_init(void)
|
{
|
suspend_set_ops(&mx27_suspend_ops);
|
}
|
