173 lines
3.7 KiB
C
173 lines
3.7 KiB
C
/* linux/arch/arm/mach-s5pv210/pm.c
|
|
*
|
|
* Copyright (c) 2010-2014 Samsung Electronics Co., Ltd.
|
|
* http://www.samsung.com
|
|
*
|
|
* S5PV210 - Power Management support
|
|
*
|
|
* Based on arch/arm/mach-s3c2410/pm.c
|
|
* Copyright (c) 2006 Simtec Electronics
|
|
* Ben Dooks <ben@simtec.co.uk>
|
|
*
|
|
* 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/syscore_ops.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/suspend.h>
|
|
|
|
#include <plat/pm-common.h>
|
|
|
|
#include "common.h"
|
|
#include "regs-clock.h"
|
|
|
|
static struct sleep_save s5pv210_core_save[] = {
|
|
/* Clock ETC */
|
|
SAVE_ITEM(S5P_MDNIE_SEL),
|
|
};
|
|
|
|
/*
|
|
* VIC wake-up support (TODO)
|
|
*/
|
|
static u32 s5pv210_irqwake_intmask = 0xffffffff;
|
|
|
|
/*
|
|
* Suspend helpers.
|
|
*/
|
|
static int s5pv210_cpu_suspend(unsigned long arg)
|
|
{
|
|
unsigned long tmp;
|
|
|
|
/* issue the standby signal into the pm unit. Note, we
|
|
* issue a write-buffer drain just in case */
|
|
|
|
tmp = 0;
|
|
|
|
asm("b 1f\n\t"
|
|
".align 5\n\t"
|
|
"1:\n\t"
|
|
"mcr p15, 0, %0, c7, c10, 5\n\t"
|
|
"mcr p15, 0, %0, c7, c10, 4\n\t"
|
|
"wfi" : : "r" (tmp));
|
|
|
|
pr_info("Failed to suspend the system\n");
|
|
return 1; /* Aborting suspend */
|
|
}
|
|
|
|
static void s5pv210_pm_prepare(void)
|
|
{
|
|
unsigned int tmp;
|
|
|
|
/* Set wake-up mask registers */
|
|
__raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
|
|
__raw_writel(s5pv210_irqwake_intmask, S5P_WAKEUP_MASK);
|
|
|
|
/* ensure at least INFORM0 has the resume address */
|
|
__raw_writel(__pa_symbol(s5pv210_cpu_resume), S5P_INFORM0);
|
|
|
|
tmp = __raw_readl(S5P_SLEEP_CFG);
|
|
tmp &= ~(S5P_SLEEP_CFG_OSC_EN | S5P_SLEEP_CFG_USBOSC_EN);
|
|
__raw_writel(tmp, S5P_SLEEP_CFG);
|
|
|
|
/* WFI for SLEEP mode configuration by SYSCON */
|
|
tmp = __raw_readl(S5P_PWR_CFG);
|
|
tmp &= S5P_CFG_WFI_CLEAN;
|
|
tmp |= S5P_CFG_WFI_SLEEP;
|
|
__raw_writel(tmp, S5P_PWR_CFG);
|
|
|
|
/* SYSCON interrupt handling disable */
|
|
tmp = __raw_readl(S5P_OTHERS);
|
|
tmp |= S5P_OTHER_SYSC_INTOFF;
|
|
__raw_writel(tmp, S5P_OTHERS);
|
|
|
|
s3c_pm_do_save(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
|
|
}
|
|
|
|
/*
|
|
* Suspend operations.
|
|
*/
|
|
static int s5pv210_suspend_enter(suspend_state_t state)
|
|
{
|
|
int ret;
|
|
|
|
s3c_pm_debug_init();
|
|
|
|
S3C_PMDBG("%s: suspending the system...\n", __func__);
|
|
|
|
S3C_PMDBG("%s: wakeup masks: %08x,%08x\n", __func__,
|
|
s5pv210_irqwake_intmask, exynos_get_eint_wake_mask());
|
|
|
|
if (s5pv210_irqwake_intmask == -1U
|
|
&& exynos_get_eint_wake_mask() == -1U) {
|
|
pr_err("%s: No wake-up sources!\n", __func__);
|
|
pr_err("%s: Aborting sleep\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
s3c_pm_save_uarts();
|
|
s5pv210_pm_prepare();
|
|
flush_cache_all();
|
|
s3c_pm_check_store();
|
|
|
|
ret = cpu_suspend(0, s5pv210_cpu_suspend);
|
|
if (ret)
|
|
return ret;
|
|
|
|
s3c_pm_restore_uarts();
|
|
|
|
S3C_PMDBG("%s: wakeup stat: %08x\n", __func__,
|
|
__raw_readl(S5P_WAKEUP_STAT));
|
|
|
|
s3c_pm_check_restore();
|
|
|
|
S3C_PMDBG("%s: resuming the system...\n", __func__);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int s5pv210_suspend_prepare(void)
|
|
{
|
|
s3c_pm_check_prepare();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void s5pv210_suspend_finish(void)
|
|
{
|
|
s3c_pm_check_cleanup();
|
|
}
|
|
|
|
static const struct platform_suspend_ops s5pv210_suspend_ops = {
|
|
.enter = s5pv210_suspend_enter,
|
|
.prepare = s5pv210_suspend_prepare,
|
|
.finish = s5pv210_suspend_finish,
|
|
.valid = suspend_valid_only_mem,
|
|
};
|
|
|
|
/*
|
|
* Syscore operations used to delay restore of certain registers.
|
|
*/
|
|
static void s5pv210_pm_resume(void)
|
|
{
|
|
s3c_pm_do_restore_core(s5pv210_core_save, ARRAY_SIZE(s5pv210_core_save));
|
|
}
|
|
|
|
static struct syscore_ops s5pv210_pm_syscore_ops = {
|
|
.resume = s5pv210_pm_resume,
|
|
};
|
|
|
|
/*
|
|
* Initialization entry point.
|
|
*/
|
|
void __init s5pv210_pm_init(void)
|
|
{
|
|
register_syscore_ops(&s5pv210_pm_syscore_ops);
|
|
suspend_set_ops(&s5pv210_suspend_ops);
|
|
}
|