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Abhilash Kesavan6436b6a2010-10-20 19:43:35 +09001/* 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
24extern void s3c2412_sleep_enter(void);
25
26static 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
39static 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
50static 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
58static int s3c2416_pm_suspend(struct sys_device *dev, pm_message_t state)
59{
60 return 0;
61}
62
63static 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
73static struct sysdev_driver s3c2416_pm_driver = {
74 .add = s3c2416_pm_add,
75 .suspend = s3c2416_pm_suspend,
76 .resume = s3c2416_pm_resume,
77};
78
79static __init int s3c2416_pm_init(void)
80{
81 return sysdev_driver_register(&s3c2416_sysclass, &s3c2416_pm_driver);
82}
83
84arch_initcall(s3c2416_pm_init);