1/*
 2 * i.MX27 Power Management Routines
 3 *
 4 * Based on Freescale's BSP
 5 *
 6 * This program is free software; you can redistribute it and/or
 7 * modify it under the terms of the GNU General Public License.
 8 */
 9
10#include <linux/kernel.h>
11#include <linux/suspend.h>
12#include <linux/io.h>
13
14#include "hardware.h"
15
16static int mx27_suspend_enter(suspend_state_t state)
17{
18	u32 cscr;
19	switch (state) {
20	case PM_SUSPEND_MEM:
21		/* Clear MPEN and SPEN to disable MPLL/SPLL */
22		cscr = imx_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
23		cscr &= 0xFFFFFFFC;
24		imx_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
25		/* Executes WFI */
26		cpu_do_idle();
27		break;
28
29	default:
30		return -EINVAL;
31	}
32	return 0;
33}
34
35static const struct platform_suspend_ops mx27_suspend_ops = {
36	.enter = mx27_suspend_enter,
37	.valid = suspend_valid_only_mem,
38};
39
40void __init imx27_pm_init(void)
41{
42	suspend_set_ops(&mx27_suspend_ops);
43}

 1/*
 2 * i.MX27 Power Management Routines
 3 *
 4 * Based on Freescale's BSP
 5 *
 6 * This program is free software; you can redistribute it and/or
 7 * modify it under the terms of the GNU General Public License.
 8 */
 9
10#include <linux/kernel.h>
11#include <linux/suspend.h>
12#include <linux/io.h>
13
14#include "hardware.h"
15
16static int mx27_suspend_enter(suspend_state_t state)
17{
18	u32 cscr;
19	switch (state) {
20	case PM_SUSPEND_MEM:
21		/* Clear MPEN and SPEN to disable MPLL/SPLL */
22		cscr = imx_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
23		cscr &= 0xFFFFFFFC;
24		imx_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
25		/* Executes WFI */
26		cpu_do_idle();
27		break;
28
29	default:
30		return -EINVAL;
31	}
32	return 0;
33}
34
35static const struct platform_suspend_ops mx27_suspend_ops = {
36	.enter = mx27_suspend_enter,
37	.valid = suspend_valid_only_mem,
38};
39
40void __init imx27_pm_init(void)
41{
42	suspend_set_ops(&mx27_suspend_ops);
43}