1 /* linux/arch/arm/plat-s3c/pm.c
3 * Copyright 2008 Openmoko, Inc.
4 * Copyright 2004-2008 Simtec Electronics
5 * Ben Dooks <ben@simtec.co.uk>
6 * http://armlinux.simtec.co.uk/
8 * S3C common power management (suspend to ram) support.
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
15 #include <linux/init.h>
16 #include <linux/suspend.h>
17 #include <linux/errno.h>
18 #include <linux/delay.h>
20 #include <linux/serial_s3c.h>
23 #include <asm/cacheflush.h>
24 #include <asm/suspend.h>
26 #ifdef CONFIG_SAMSUNG_ATAGS
28 #ifndef CONFIG_ARCH_EXYNOS
29 #include <mach/regs-clock.h>
30 #include <mach/regs-irq.h>
32 #include <mach/irqs.h>
38 #include <mach/pm-core.h>
40 /* for external use */
42 unsigned long s3c_pm_flags
;
44 /* The IRQ ext-int code goes here, it is too small to currently bother
45 * with its own file. */
47 unsigned long s3c_irqwake_intmask
= 0xffffffffL
;
48 unsigned long s3c_irqwake_eintmask
= 0xffffffffL
;
50 int s3c_irqext_wake(struct irq_data
*data
, unsigned int state
)
52 unsigned long bit
= 1L << IRQ_EINT_BIT(data
->irq
);
54 if (!(s3c_irqwake_eintallow
& bit
))
57 printk(KERN_INFO
"wake %s for irq %d\n",
58 state
? "enabled" : "disabled", data
->irq
);
61 s3c_irqwake_eintmask
|= bit
;
63 s3c_irqwake_eintmask
&= ~bit
;
68 void (*pm_cpu_prep
)(void);
69 int (*pm_cpu_sleep
)(unsigned long);
71 #define any_allowed(mask, allow) (((mask) & (allow)) != (allow))
75 * central control for sleep/resume process
78 static int s3c_pm_enter(suspend_state_t state
)
81 /* ensure the debug is initialised (if enabled) */
85 S3C_PMDBG("%s(%d)\n", __func__
, state
);
87 if (pm_cpu_prep
== NULL
|| pm_cpu_sleep
== NULL
) {
88 printk(KERN_ERR
"%s: error: no cpu sleep function\n", __func__
);
92 /* check if we have anything to wake-up with... bad things seem
93 * to happen if you suspend with no wakeup (system will often
94 * require a full power-cycle)
97 if (!of_have_populated_dt() &&
98 !any_allowed(s3c_irqwake_intmask
, s3c_irqwake_intallow
) &&
99 !any_allowed(s3c_irqwake_eintmask
, s3c_irqwake_eintallow
)) {
100 printk(KERN_ERR
"%s: No wake-up sources!\n", __func__
);
101 printk(KERN_ERR
"%s: Aborting sleep\n", __func__
);
105 /* save all necessary core registers not covered by the drivers */
107 if (!of_have_populated_dt()) {
108 samsung_pm_save_gpios();
109 samsung_pm_saved_gpios();
115 /* set the irq configuration for wake */
117 s3c_pm_configure_extint();
119 S3C_PMDBG("sleep: irq wakeup masks: %08lx,%08lx\n",
120 s3c_irqwake_intmask
, s3c_irqwake_eintmask
);
122 s3c_pm_arch_prepare_irqs();
124 /* call cpu specific preparation */
128 /* flush cache back to ram */
132 s3c_pm_check_store();
134 /* send the cpu to sleep... */
136 s3c_pm_arch_stop_clocks();
138 /* this will also act as our return point from when
139 * we resume as it saves its own register state and restores it
140 * during the resume. */
142 ret
= cpu_suspend(0, pm_cpu_sleep
);
146 /* restore the system state */
148 s3c_pm_restore_core();
149 s3c_pm_restore_uarts();
151 if (!of_have_populated_dt()) {
152 samsung_pm_restore_gpios();
153 s3c_pm_restored_gpios();
158 /* check what irq (if any) restored the system */
160 s3c_pm_arch_show_resume_irqs();
162 S3C_PMDBG("%s: post sleep, preparing to return\n", __func__
);
164 /* LEDs should now be 1110 */
165 s3c_pm_debug_smdkled(1 << 1, 0);
167 s3c_pm_check_restore();
169 /* ok, let's return from sleep */
171 S3C_PMDBG("S3C PM Resume (post-restore)\n");
175 static int s3c_pm_prepare(void)
177 /* prepare check area if configured */
179 s3c_pm_check_prepare();
183 static void s3c_pm_finish(void)
185 s3c_pm_check_cleanup();
188 static const struct platform_suspend_ops s3c_pm_ops
= {
189 .enter
= s3c_pm_enter
,
190 .prepare
= s3c_pm_prepare
,
191 .finish
= s3c_pm_finish
,
192 .valid
= suspend_valid_only_mem
,
197 * Attach the power management functions. This should be called
198 * from the board specific initialisation if the board supports
202 int __init
s3c_pm_init(void)
204 printk("S3C Power Management, Copyright 2004 Simtec Electronics\n");
206 suspend_set_ops(&s3c_pm_ops
);