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/of_address.h>
11#include <linux/kernel.h>
12#include <linux/suspend.h>
13#include <linux/io.h>
14
15#include "common.h"
16#include "hardware.h"
17
18static int mx27_suspend_enter(suspend_state_t state)
19{
20	void __iomem *ccm_base;
21	struct device_node *np;
22	u32 cscr;
23
24	np = of_find_compatible_node(NULL, NULL, "fsl,imx27-ccm");
25	ccm_base = of_iomap(np, 0);
26	BUG_ON(!ccm_base);
27
28	switch (state) {
29	case PM_SUSPEND_MEM:
30		/* Clear MPEN and SPEN to disable MPLL/SPLL */
31		cscr = imx_readl(ccm_base);
32		cscr &= 0xFFFFFFFC;
33		imx_writel(cscr, ccm_base);
34		/* Executes WFI */
35		cpu_do_idle();
36		break;
37
38	default:
39		return -EINVAL;
40	}
41	return 0;
42}
43
44static const struct platform_suspend_ops mx27_suspend_ops = {
45	.enter = mx27_suspend_enter,
46	.valid = suspend_valid_only_mem,
47};
48
49void __init imx27_pm_init(void)
50{
51	suspend_set_ops(&mx27_suspend_ops);
52}
53