205 строки
4.3 KiB
C
205 строки
4.3 KiB
C
/* linux/arch/arm/plat-s3c/pm.c
|
|
*
|
|
* Copyright 2008 Openmoko, Inc.
|
|
* Copyright 2004-2008 Simtec Electronics
|
|
* Ben Dooks <ben@simtec.co.uk>
|
|
* http://armlinux.simtec.co.uk/
|
|
*
|
|
* S3C common power management (suspend to ram) support.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/suspend.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/of.h>
|
|
#include <linux/serial_s3c.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/suspend.h>
|
|
|
|
#include <mach/map.h>
|
|
#include <mach/regs-clock.h>
|
|
#include <mach/regs-irq.h>
|
|
#include <mach/irqs.h>
|
|
|
|
#include <asm/irq.h>
|
|
|
|
#include <plat/pm.h>
|
|
#include <mach/pm-core.h>
|
|
|
|
/* for external use */
|
|
|
|
unsigned long s3c_pm_flags;
|
|
|
|
/* The IRQ ext-int code goes here, it is too small to currently bother
|
|
* with its own file. */
|
|
|
|
unsigned long s3c_irqwake_intmask = 0xffffffffL;
|
|
unsigned long s3c_irqwake_eintmask = 0xffffffffL;
|
|
|
|
int s3c_irqext_wake(struct irq_data *data, unsigned int state)
|
|
{
|
|
unsigned long bit = 1L << IRQ_EINT_BIT(data->irq);
|
|
|
|
if (!(s3c_irqwake_eintallow & bit))
|
|
return -ENOENT;
|
|
|
|
printk(KERN_INFO "wake %s for irq %d\n",
|
|
state ? "enabled" : "disabled", data->irq);
|
|
|
|
if (!state)
|
|
s3c_irqwake_eintmask |= bit;
|
|
else
|
|
s3c_irqwake_eintmask &= ~bit;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void (*pm_cpu_prep)(void);
|
|
int (*pm_cpu_sleep)(unsigned long);
|
|
|
|
#define any_allowed(mask, allow) (((mask) & (allow)) != (allow))
|
|
|
|
/* s3c_pm_enter
|
|
*
|
|
* central control for sleep/resume process
|
|
*/
|
|
|
|
static int s3c_pm_enter(suspend_state_t state)
|
|
{
|
|
int ret;
|
|
/* ensure the debug is initialised (if enabled) */
|
|
|
|
s3c_pm_debug_init();
|
|
|
|
S3C_PMDBG("%s(%d)\n", __func__, state);
|
|
|
|
if (pm_cpu_prep == NULL || pm_cpu_sleep == NULL) {
|
|
printk(KERN_ERR "%s: error: no cpu sleep function\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* check if we have anything to wake-up with... bad things seem
|
|
* to happen if you suspend with no wakeup (system will often
|
|
* require a full power-cycle)
|
|
*/
|
|
|
|
if (!of_have_populated_dt() &&
|
|
!any_allowed(s3c_irqwake_intmask, s3c_irqwake_intallow) &&
|
|
!any_allowed(s3c_irqwake_eintmask, s3c_irqwake_eintallow)) {
|
|
printk(KERN_ERR "%s: No wake-up sources!\n", __func__);
|
|
printk(KERN_ERR "%s: Aborting sleep\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* save all necessary core registers not covered by the drivers */
|
|
|
|
if (!of_have_populated_dt()) {
|
|
samsung_pm_save_gpios();
|
|
samsung_pm_saved_gpios();
|
|
}
|
|
|
|
s3c_pm_save_uarts();
|
|
s3c_pm_save_core();
|
|
|
|
/* set the irq configuration for wake */
|
|
|
|
s3c_pm_configure_extint();
|
|
|
|
S3C_PMDBG("sleep: irq wakeup masks: %08lx,%08lx\n",
|
|
s3c_irqwake_intmask, s3c_irqwake_eintmask);
|
|
|
|
s3c_pm_arch_prepare_irqs();
|
|
|
|
/* call cpu specific preparation */
|
|
|
|
pm_cpu_prep();
|
|
|
|
/* flush cache back to ram */
|
|
|
|
flush_cache_all();
|
|
|
|
s3c_pm_check_store();
|
|
|
|
/* send the cpu to sleep... */
|
|
|
|
s3c_pm_arch_stop_clocks();
|
|
|
|
/* this will also act as our return point from when
|
|
* we resume as it saves its own register state and restores it
|
|
* during the resume. */
|
|
|
|
ret = cpu_suspend(0, pm_cpu_sleep);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/* restore the system state */
|
|
|
|
s3c_pm_restore_core();
|
|
s3c_pm_restore_uarts();
|
|
|
|
if (!of_have_populated_dt()) {
|
|
samsung_pm_restore_gpios();
|
|
s3c_pm_restored_gpios();
|
|
}
|
|
|
|
s3c_pm_debug_init();
|
|
|
|
/* check what irq (if any) restored the system */
|
|
|
|
s3c_pm_arch_show_resume_irqs();
|
|
|
|
S3C_PMDBG("%s: post sleep, preparing to return\n", __func__);
|
|
|
|
/* LEDs should now be 1110 */
|
|
s3c_pm_debug_smdkled(1 << 1, 0);
|
|
|
|
s3c_pm_check_restore();
|
|
|
|
/* ok, let's return from sleep */
|
|
|
|
S3C_PMDBG("S3C PM Resume (post-restore)\n");
|
|
return 0;
|
|
}
|
|
|
|
static int s3c_pm_prepare(void)
|
|
{
|
|
/* prepare check area if configured */
|
|
|
|
s3c_pm_check_prepare();
|
|
return 0;
|
|
}
|
|
|
|
static void s3c_pm_finish(void)
|
|
{
|
|
s3c_pm_check_cleanup();
|
|
}
|
|
|
|
static const struct platform_suspend_ops s3c_pm_ops = {
|
|
.enter = s3c_pm_enter,
|
|
.prepare = s3c_pm_prepare,
|
|
.finish = s3c_pm_finish,
|
|
.valid = suspend_valid_only_mem,
|
|
};
|
|
|
|
/* s3c_pm_init
|
|
*
|
|
* Attach the power management functions. This should be called
|
|
* from the board specific initialisation if the board supports
|
|
* it.
|
|
*/
|
|
|
|
int __init s3c_pm_init(void)
|
|
{
|
|
printk("S3C Power Management, Copyright 2004 Simtec Electronics\n");
|
|
|
|
suspend_set_ops(&s3c_pm_ops);
|
|
return 0;
|
|
}
|