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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/of_address.h>
#include <linux/kernel.h>
#include <linux/suspend.h>
#include <linux/io.h>
#include "hardware.h"
static int mx27_suspend_enter(suspend_state_t state)
{
void __iomem *ccm_base;
struct device_node *np;
u32 cscr;
np = of_find_compatible_node(NULL, NULL, "fsl,imx27-ccm");
ccm_base = of_iomap(np, 0);
BUG_ON(!ccm_base);
switch (state) {
case PM_SUSPEND_MEM:
/* Clear MPEN and SPEN to disable MPLL/SPLL */
cscr = imx_readl(ccm_base);
cscr &= 0xFFFFFFFC;
imx_writel(cscr, ccm_base);
/* 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);
}
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