i.MX27: add suspend to RAM support

obj-$(CONFIG_MACH_MX21) += clock_imx21.o mm-imx21.o

obj-$(CONFIG_MACH_MX27) += cpu_imx27.o

obj-$(CONFIG_MACH_MX27) += cpu_imx27.o pm-imx27.o

obj-$(CONFIG_MACH_MX27) += clock_imx27.o mm-imx27.o

obj-$(CONFIG_MACH_MX21ADS) += mach-mx21ads.o

/*

 * 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 struct platform_suspend_ops mx27_suspend_ops = {

	.enter = mx27_suspend_enter,

	.valid = suspend_valid_only_mem,

};

static int __init mx27_pm_init(void)

{

	suspend_set_ops(&mx27_suspend_ops);

	return 0;

}

device_initcall(mx27_pm_init);