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/*
* Copyright (C) 2012 Spreadtrum Communications Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/init.h>
#include <linux/suspend.h>
#include <linux/errno.h>
#include <linux/io.h>
extern void sc_pm_init(void);
#include <asm/irqflags.h>
#include <soc/sprd/pm_debug.h>
#include <soc/sprd/globalregs.h>
#if defined(CONFIG_ARCH_SCX35L64)||defined(CONFIG_ARCH_SCX35LT8)
#include <soc/sprd/sprd_persistent_clock.h>
#endif
extern unsigned int sprd_irq_pending(void);
extern int sprd_cpu_deep_sleep(unsigned int cpu);
extern void sc_pm_init(void);
extern void check_ldo(void);
extern void check_pd(void);
#if 0 /*comment for bug 179358 */
/*for battery*/
#define BATTERY_CHECK_INTERVAL 30000
extern int battery_updata(void);
static int __used sprd_check_battery(void)
{
int ret_val = 0;
if (battery_updata()) {
ret_val = 1;
}
return ret_val;
}
#endif
static void sprd_pm_standby(void)
{
cpu_do_idle();
}
static int sprd_pm_deepsleep(suspend_state_t state)
{
int ret_val = 0;
unsigned long flags;
unsigned int cpu = smp_processor_id();
u32 battery_time, cur_time;
battery_time = cur_time = get_sys_cnt();
/* add for debug & statisic*/
clr_sleep_mode();
time_statisic_begin();
/*
* when we get here, only boot cpu still alive
*/
if( cpu ){
__WARN();
goto enter_exit;
}
printk("cpu%d, enter %s\n", cpu, __func__ );
while(1){
local_fiq_disable();
local_irq_save(flags);
WARN_ONCE(!irqs_disabled(), "#####: Interrupts enabled in pm_enter()!\n");
sprd_cpu_deep_sleep(cpu);
if( sprd_irq_pending() ){
irq_wakeup_set();
local_irq_restore(flags);
local_fiq_enable();
break;
}
/*TODO: charging in power down
cur_time = get_sys_cnt();
if ((cur_time - battery_time) > BATTERY_CHECK_INTERVAL) {
battery_time = cur_time;
if (sprd_check_battery()) {
printk("###: battery low!\n");
break;
}
}
*/
}/*end while*/
time_statisic_end();
enter_exit:
return ret_val;
}
static int sprd_pm_enter(suspend_state_t state)
{
int rval = 0;
switch (state) {
case PM_SUSPEND_STANDBY:
sprd_pm_standby( );
break;
case PM_SUSPEND_MEM:
rval = sprd_pm_deepsleep(state);
break;
default:
break;
}
return rval;
}
static int sprd_pm_valid(suspend_state_t state)
{
pr_debug("pm_valid: %d\n", state);
switch (state) {
case PM_SUSPEND_ON:
case PM_SUSPEND_STANDBY:
case PM_SUSPEND_MEM:
return 1;
default:
return 0;
}
}
static int sprd_pm_prepare(void)
{
pr_debug("enter %s\n", __func__);
check_ldo();
check_pd();
return 0;
}
static void sprd_pm_finish(void)
{
pr_debug("enter %s\n", __func__);
print_statisic();
}
static struct platform_suspend_ops sprd_pm_ops = {
.valid = sprd_pm_valid,
.enter = sprd_pm_enter,
.prepare = sprd_pm_prepare,
.prepare_late = NULL,
.finish = sprd_pm_finish,
};
static int __init sprd_pm_init(void)
{
sc_pm_init();
#ifdef CONFIG_SUSPEND
suspend_set_ops(&sprd_pm_ops);
#endif
return 0;
}
subsys_initcall(sprd_pm_init);
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