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
18 static 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
44 static const struct platform_suspend_ops mx27_suspend_ops = {
45 .enter = mx27_suspend_enter,
46 .valid = suspend_valid_only_mem,
47 };
48
49 void __init imx27_pm_init(void)
50 {
51 suspend_set_ops(&mx27_suspend_ops);
52 }
53
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