1 /* linux/arch/arm/mach-s3c2412/pm.c
2 *
3 * Copyright (c) 2006 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * http://armlinux.simtec.co.uk/.
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/kernel.h>
14 #include <linux/types.h>
15 #include <linux/interrupt.h>
16 #include <linux/list.h>
17 #include <linux/timer.h>
18 #include <linux/init.h>
19 #include <linux/sysdev.h>
20 #include <linux/platform_device.h>
21 #include <linux/io.h>
22
23 #include <mach/hardware.h>
24 #include <asm/cacheflush.h>
25 #include <asm/irq.h>
26
27 #include <mach/regs-power.h>
28 #include <mach/regs-gpioj.h>
29 #include <mach/regs-gpio.h>
30 #include <mach/regs-dsc.h>
31
32 #include <plat/cpu.h>
33 #include <plat/pm.h>
34
35 #include <plat/s3c2412.h>
36
37 extern void s3c2412_sleep_enter(void);
38
39 static void s3c2412_cpu_suspend(void)
40 {
41 unsigned long tmp;
42
43 flush_cache_all();
44
45 /* set our standby method to sleep */
46
47 tmp = __raw_readl(S3C2412_PWRCFG);
48 tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
49 __raw_writel(tmp, S3C2412_PWRCFG);
50
51 s3c2412_sleep_enter();
52 }
53
54 static void s3c2412_pm_prepare(void)
55 {
56 }
57
58 static int s3c2412_pm_add(struct sys_device *sysdev)
59 {
60 pm_cpu_prep = s3c2412_pm_prepare;
61 pm_cpu_sleep = s3c2412_cpu_suspend;
62
63 return 0;
64 }
65
66 static struct sleep_save s3c2412_sleep[] = {
67 SAVE_ITEM(S3C2412_DSC0),
68 SAVE_ITEM(S3C2412_DSC1),
69 SAVE_ITEM(S3C2413_GPJDAT),
70 SAVE_ITEM(S3C2413_GPJCON),
71 SAVE_ITEM(S3C2413_GPJUP),
72
73 /* save the PWRCFG to get back to original sleep method */
74
75 SAVE_ITEM(S3C2412_PWRCFG),
76
77 /* save the sleep configuration anyway, just in case these
78 * get damaged during wakeup */
79
80 SAVE_ITEM(S3C2412_GPBSLPCON),
81 SAVE_ITEM(S3C2412_GPCSLPCON),
82 SAVE_ITEM(S3C2412_GPDSLPCON),
83 SAVE_ITEM(S3C2412_GPFSLPCON),
84 SAVE_ITEM(S3C2412_GPGSLPCON),
85 SAVE_ITEM(S3C2412_GPHSLPCON),
86 SAVE_ITEM(S3C2413_GPJSLPCON),
87 };
88
89 static int s3c2412_pm_suspend(struct sys_device *dev, pm_message_t state)
90 {
91 s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
92 return 0;
93 }
94
95 static int s3c2412_pm_resume(struct sys_device *dev)
96 {
97 unsigned long tmp;
98
99 tmp = __raw_readl(S3C2412_PWRCFG);
100 tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
101 tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
102 __raw_writel(tmp, S3C2412_PWRCFG);
103
104 s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
105 return 0;
106 }
107
108 static struct sysdev_driver s3c2412_pm_driver = {
109 .add = s3c2412_pm_add,
110 .suspend = s3c2412_pm_suspend,
111 .resume = s3c2412_pm_resume,
112 };
113
114 static __init int s3c2412_pm_init(void)
115 {
116 return sysdev_driver_register(&s3c2412_sysclass, &s3c2412_pm_driver);
117 }
118
119 arch_initcall(s3c2412_pm_init);
120
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