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
27extern void s3c2412_sleep_enter(void);
28
29static 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
43static 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(virt_to_phys(s3c_cpu_resume), S3C2412_INFORM1);
52}
53
54static 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
62static struct subsys_interface s3c2416_pm_interface = {
63	.name		= "s3c2416_pm",
64	.subsys		= &s3c2416_subsys,
65	.add_dev	= s3c2416_pm_add,
66};
67
68static __init int s3c2416_pm_init(void)
69{
70	return subsys_interface_register(&s3c2416_pm_interface);
71}
72
73arch_initcall(s3c2416_pm_init);
74#endif
75
76static 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
84struct syscore_ops s3c2416_pm_syscore_ops = {
85	.resume		= s3c2416_pm_resume,
86};
87