blob: 56d02d064fbf941c3b070cced2bf2f2e88a9056e [file] [log] [blame]
Eric Bénardf42ae0e2010-06-01 21:57:44 +02001/*
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>
Shawn Guo50f2de62012-09-14 14:14:45 +080013
14#include "hardware.h"
Eric Bénardf42ae0e2010-06-01 21:57:44 +020015
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 = __raw_readl(MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
23 cscr &= 0xFFFFFFFC;
24 __raw_writel(cscr, MX27_IO_ADDRESS(MX27_CCM_BASE_ADDR));
25 /* Executes WFI */
Nicolas Pitre4a3ea242011-08-03 11:34:59 -040026 cpu_do_idle();
Eric Bénardf42ae0e2010-06-01 21:57:44 +020027 break;
28
29 default:
30 return -EINVAL;
31 }
32 return 0;
33}
34
Lionel Debroux2f55ac02010-11-16 14:14:02 +010035static const struct platform_suspend_ops mx27_suspend_ops = {
Eric Bénardf42ae0e2010-06-01 21:57:44 +020036 .enter = mx27_suspend_enter,
37 .valid = suspend_valid_only_mem,
38};
39
40static int __init mx27_pm_init(void)
41{
Sascha Hauer76586d32010-11-04 23:09:18 +010042 if (!cpu_is_mx27())
43 return 0;
44
Eric Bénardf42ae0e2010-06-01 21:57:44 +020045 suspend_set_ops(&mx27_suspend_ops);
46 return 0;
47}
48
49device_initcall(mx27_pm_init);