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