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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); |
85 |
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