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
s3c2416_cpu_suspend(unsigned long arg)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
s3c2416_pm_prepare(void)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(virt_to_phys(s3c_cpu_resume), S3C2412_INFORM1);
52 }
53
s3c2416_pm_add(struct device * dev,struct subsys_interface * sif)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
s3c2416_pm_init(void)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
s3c2416_pm_resume(void)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 };
87