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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/sysdev.h> | |
14 | #include <linux/io.h> | |
15 | ||
16 | #include <asm/cacheflush.h> | |
17 | ||
18 | #include <mach/regs-power.h> | |
19 | #include <mach/regs-s3c2443-clock.h> | |
20 | ||
21 | #include <plat/cpu.h> | |
22 | #include <plat/pm.h> | |
23 | ||
24 | extern void s3c2412_sleep_enter(void); | |
25 | ||
26 | static void s3c2416_cpu_suspend(void) | |
27 | { | |
28 | flush_cache_all(); | |
29 | ||
30 | /* enable wakeup sources regardless of battery state */ | |
31 | __raw_writel(S3C2443_PWRCFG_SLEEP, S3C2443_PWRCFG); | |
32 | ||
33 | /* set the mode as sleep, 2BED represents "Go to BED" */ | |
34 | __raw_writel(0x2BED, S3C2443_PWRMODE); | |
35 | ||
36 | s3c2412_sleep_enter(); | |
37 | } | |
38 | ||
39 | static void s3c2416_pm_prepare(void) | |
40 | { | |
41 | /* | |
42 | * write the magic value u-boot uses to check for resume into | |
43 | * the INFORM0 register, and ensure INFORM1 is set to the | |
44 | * correct address to resume from. | |
45 | */ | |
46 | __raw_writel(0x2BED, S3C2412_INFORM0); | |
47 | __raw_writel(virt_to_phys(s3c_cpu_resume), S3C2412_INFORM1); | |
48 | } | |
49 | ||
50 | static int s3c2416_pm_add(struct sys_device *sysdev) | |
51 | { | |
52 | pm_cpu_prep = s3c2416_pm_prepare; | |
53 | pm_cpu_sleep = s3c2416_cpu_suspend; | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | static int s3c2416_pm_suspend(struct sys_device *dev, pm_message_t state) | |
59 | { | |
60 | return 0; | |
61 | } | |
62 | ||
63 | static int s3c2416_pm_resume(struct sys_device *dev) | |
64 | { | |
65 | /* unset the return-from-sleep amd inform flags */ | |
66 | __raw_writel(0x0, S3C2443_PWRMODE); | |
67 | __raw_writel(0x0, S3C2412_INFORM0); | |
68 | __raw_writel(0x0, S3C2412_INFORM1); | |
69 | ||
70 | return 0; | |
71 | } | |
72 | ||
73 | static struct sysdev_driver s3c2416_pm_driver = { | |
74 | .add = s3c2416_pm_add, | |
75 | .suspend = s3c2416_pm_suspend, | |
76 | .resume = s3c2416_pm_resume, | |
77 | }; | |
78 | ||
79 | static __init int s3c2416_pm_init(void) | |
80 | { | |
81 | return sysdev_driver_register(&s3c2416_sysclass, &s3c2416_pm_driver); | |
82 | } | |
83 | ||
84 | arch_initcall(s3c2416_pm_init); |