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/device.h>
20 #include <linux/syscore_ops.h>
21 #include <linux/platform_device.h>
22 #include <linux/io.h>
23
24 #include <asm/cacheflush.h>
25 #include <asm/irq.h>
26
27 #include <mach/hardware.h>
28 #include <mach/regs-gpio.h>
29
30 #include <plat/cpu.h>
31 #include <plat/pm.h>
32 #include <plat/wakeup-mask.h>
33
34 #include "regs-dsc.h"
35 #include "s3c2412-power.h"
36
37 extern void s3c2412_sleep_enter(void);
38
s3c2412_cpu_suspend(unsigned long arg)39 static int s3c2412_cpu_suspend(unsigned long arg)
40 {
41 unsigned long tmp;
42
43 /* set our standby method to sleep */
44
45 tmp = __raw_readl(S3C2412_PWRCFG);
46 tmp |= S3C2412_PWRCFG_STANDBYWFI_SLEEP;
47 __raw_writel(tmp, S3C2412_PWRCFG);
48
49 s3c2412_sleep_enter();
50
51 pr_info("Failed to suspend the system\n");
52 return 1; /* Aborting suspend */
53 }
54
55 /* mapping of interrupts to parts of the wakeup mask */
56 static struct samsung_wakeup_mask wake_irqs[] = {
57 { .irq = IRQ_RTC, .bit = S3C2412_PWRCFG_RTC_MASKIRQ, },
58 };
59
s3c2412_pm_prepare(void)60 static void s3c2412_pm_prepare(void)
61 {
62 samsung_sync_wakemask(S3C2412_PWRCFG,
63 wake_irqs, ARRAY_SIZE(wake_irqs));
64 }
65
s3c2412_pm_add(struct device * dev,struct subsys_interface * sif)66 static int s3c2412_pm_add(struct device *dev, struct subsys_interface *sif)
67 {
68 pm_cpu_prep = s3c2412_pm_prepare;
69 pm_cpu_sleep = s3c2412_cpu_suspend;
70
71 return 0;
72 }
73
74 static struct sleep_save s3c2412_sleep[] = {
75 SAVE_ITEM(S3C2412_DSC0),
76 SAVE_ITEM(S3C2412_DSC1),
77 SAVE_ITEM(S3C2413_GPJDAT),
78 SAVE_ITEM(S3C2413_GPJCON),
79 SAVE_ITEM(S3C2413_GPJUP),
80
81 /* save the PWRCFG to get back to original sleep method */
82
83 SAVE_ITEM(S3C2412_PWRCFG),
84
85 /* save the sleep configuration anyway, just in case these
86 * get damaged during wakeup */
87
88 SAVE_ITEM(S3C2412_GPBSLPCON),
89 SAVE_ITEM(S3C2412_GPCSLPCON),
90 SAVE_ITEM(S3C2412_GPDSLPCON),
91 SAVE_ITEM(S3C2412_GPFSLPCON),
92 SAVE_ITEM(S3C2412_GPGSLPCON),
93 SAVE_ITEM(S3C2412_GPHSLPCON),
94 SAVE_ITEM(S3C2413_GPJSLPCON),
95 };
96
97 static struct subsys_interface s3c2412_pm_interface = {
98 .name = "s3c2412_pm",
99 .subsys = &s3c2412_subsys,
100 .add_dev = s3c2412_pm_add,
101 };
102
s3c2412_pm_init(void)103 static __init int s3c2412_pm_init(void)
104 {
105 return subsys_interface_register(&s3c2412_pm_interface);
106 }
107
108 arch_initcall(s3c2412_pm_init);
109
s3c2412_pm_suspend(void)110 static int s3c2412_pm_suspend(void)
111 {
112 s3c_pm_do_save(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
113 return 0;
114 }
115
s3c2412_pm_resume(void)116 static void s3c2412_pm_resume(void)
117 {
118 unsigned long tmp;
119
120 tmp = __raw_readl(S3C2412_PWRCFG);
121 tmp &= ~S3C2412_PWRCFG_STANDBYWFI_MASK;
122 tmp |= S3C2412_PWRCFG_STANDBYWFI_IDLE;
123 __raw_writel(tmp, S3C2412_PWRCFG);
124
125 s3c_pm_do_restore(s3c2412_sleep, ARRAY_SIZE(s3c2412_sleep));
126 }
127
128 struct syscore_ops s3c2412_pm_syscore_ops = {
129 .suspend = s3c2412_pm_suspend,
130 .resume = s3c2412_pm_resume,
131 };
132