Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target...
[sfrench/cifs-2.6.git] / arch / arm / mach-s3c24xx / pm-s3c2416.c
1 /* linux/arch/arm/mach-s3c2416/pm.c
2  *
3  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
4  *              http://www.samsung.com
5  *
6  * S3C2416 - PM support (Based on Ben Dooks' S3C2412 PM support)
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License version 2 as
10  * published by the Free Software Foundation.
11 */
12
13 #include <linux/device.h>
14 #include <linux/syscore_ops.h>
15 #include <linux/io.h>
16
17 #include <asm/cacheflush.h>
18
19 #include <mach/regs-s3c2443-clock.h>
20
21 #include <plat/cpu.h>
22 #include <plat/pm.h>
23
24 #include "s3c2412-power.h"
25
26 #ifdef CONFIG_PM_SLEEP
27 extern void s3c2412_sleep_enter(void);
28
29 static int s3c2416_cpu_suspend(unsigned long arg)
30 {
31         /* enable wakeup sources regardless of battery state */
32         __raw_writel(S3C2443_PWRCFG_SLEEP, S3C2443_PWRCFG);
33
34         /* set the mode as sleep, 2BED represents "Go to BED" */
35         __raw_writel(0x2BED, S3C2443_PWRMODE);
36
37         s3c2412_sleep_enter();
38
39         pr_info("Failed to suspend the system\n");
40         return 1; /* Aborting suspend */
41 }
42
43 static void s3c2416_pm_prepare(void)
44 {
45         /*
46          * write the magic value u-boot uses to check for resume into
47          * the INFORM0 register, and ensure INFORM1 is set to the
48          * correct address to resume from.
49          */
50         __raw_writel(0x2BED, S3C2412_INFORM0);
51         __raw_writel(__pa_symbol(s3c_cpu_resume), S3C2412_INFORM1);
52 }
53
54 static int s3c2416_pm_add(struct device *dev, struct subsys_interface *sif)
55 {
56         pm_cpu_prep = s3c2416_pm_prepare;
57         pm_cpu_sleep = s3c2416_cpu_suspend;
58
59         return 0;
60 }
61
62 static struct subsys_interface s3c2416_pm_interface = {
63         .name           = "s3c2416_pm",
64         .subsys         = &s3c2416_subsys,
65         .add_dev        = s3c2416_pm_add,
66 };
67
68 static __init int s3c2416_pm_init(void)
69 {
70         return subsys_interface_register(&s3c2416_pm_interface);
71 }
72
73 arch_initcall(s3c2416_pm_init);
74 #endif
75
76 static void s3c2416_pm_resume(void)
77 {
78         /* unset the return-from-sleep amd inform flags */
79         __raw_writel(0x0, S3C2443_PWRMODE);
80         __raw_writel(0x0, S3C2412_INFORM0);
81         __raw_writel(0x0, S3C2412_INFORM1);
82 }
83
84 struct syscore_ops s3c2416_pm_syscore_ops = {
85         .resume         = s3c2416_pm_resume,
86 };