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/*
* Copyright (c) 2011-2012 Samsung Electronics Co., Ltd.
* http://www.samsung.com
*
* EXYNOS - 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 <linux/err.h>
#include <linux/clk.h>
#include <asm/cacheflush.h>
#include <asm/hardware/cache-l2x0.h>
#include <asm/smp_scu.h>
#include <asm/suspend.h>
#include <plat/cpu.h>
#include <plat/pm-common.h>
#include <plat/pll.h>
#include <plat/regs-srom.h>
#include <mach/map.h>
#include "common.h"
#include "regs-pmu.h"
static struct sleep_save exynos5_sys_save[] = {
SAVE_ITEM(EXYNOS5_SYS_I2C_CFG),
};
static struct sleep_save exynos_core_save[] = {
/* SROM side */
SAVE_ITEM(S5P_SROM_BW),
SAVE_ITEM(S5P_SROM_BC0),
SAVE_ITEM(S5P_SROM_BC1),
SAVE_ITEM(S5P_SROM_BC2),
SAVE_ITEM(S5P_SROM_BC3),
};
static u32 exynos_irqwake_intmask = 0xffffffff;
/* For Cortex-A9 Diagnostic and Power control register */
static unsigned int save_arm_register[2];
static int exynos_cpu_suspend(unsigned long arg)
{
#ifdef CONFIG_CACHE_L2X0
outer_flush_all();
#endif
if (soc_is_exynos5250())
flush_cache_all();
/* issue the standby signal into the pm unit. */
cpu_do_idle();
pr_info("Failed to suspend the system\n");
return 1; /* Aborting suspend */
}
static void exynos_pm_prepare(void)
{
unsigned int tmp;
/* Set wake-up mask registers */
__raw_writel(exynos_get_eint_wake_mask(), S5P_EINT_WAKEUP_MASK);
__raw_writel(exynos_irqwake_intmask & ~(1 << 31), S5P_WAKEUP_MASK);
s3c_pm_do_save(exynos_core_save, ARRAY_SIZE(exynos_core_save));
if (soc_is_exynos5250()) {
s3c_pm_do_save(exynos5_sys_save, ARRAY_SIZE(exynos5_sys_save));
/* Disable USE_RETENTION of JPEG_MEM_OPTION */
tmp = __raw_readl(EXYNOS5_JPEG_MEM_OPTION);
tmp &= ~EXYNOS5_OPTION_USE_RETENTION;
__raw_writel(tmp, EXYNOS5_JPEG_MEM_OPTION);
}
/* Set value of power down register for sleep mode */
exynos_sys_powerdown_conf(SYS_SLEEP);
__raw_writel(S5P_CHECK_SLEEP, S5P_INFORM1);
/* ensure at least INFORM0 has the resume address */
__raw_writel(virt_to_phys(exynos_cpu_resume), S5P_INFORM0);
}
static int exynos_pm_suspend(void)
{
unsigned long tmp;
/* Setting Central Sequence Register for power down mode */
tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
tmp &= ~S5P_CENTRAL_LOWPWR_CFG;
__raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
/* Setting SEQ_OPTION register */
tmp = (S5P_USE_STANDBY_WFI0 | S5P_USE_STANDBY_WFE0);
__raw_writel(tmp, S5P_CENTRAL_SEQ_OPTION);
if (!soc_is_exynos5250()) {
/* Save Power control register */
asm ("mrc p15, 0, %0, c15, c0, 0"
: "=r" (tmp) : : "cc");
save_arm_register[0] = tmp;
/* Save Diagnostic register */
asm ("mrc p15, 0, %0, c15, c0, 1"
: "=r" (tmp) : : "cc");
save_arm_register[1] = tmp;
}
return 0;
}
static void exynos_pm_resume(void)
{
unsigned long tmp;
/*
* If PMU failed while entering sleep mode, WFI will be
* ignored by PMU and then exiting cpu_do_idle().
* S5P_CENTRAL_LOWPWR_CFG bit will not be set automatically
* in this situation.
*/
tmp = __raw_readl(S5P_CENTRAL_SEQ_CONFIGURATION);
if (!(tmp & S5P_CENTRAL_LOWPWR_CFG)) {
tmp |= S5P_CENTRAL_LOWPWR_CFG;
__raw_writel(tmp, S5P_CENTRAL_SEQ_CONFIGURATION);
/* clear the wakeup state register */
__raw_writel(0x0, S5P_WAKEUP_STAT);
/* No need to perform below restore code */
goto early_wakeup;
}
if (!soc_is_exynos5250()) {
/* Restore Power control register */
tmp = save_arm_register[0];
asm volatile ("mcr p15, 0, %0, c15, c0, 0"
: : "r" (tmp)
: "cc");
/* Restore Diagnostic register */
tmp = save_arm_register[1];
asm volatile ("mcr p15, 0, %0, c15, c0, 1"
: : "r" (tmp)
: "cc");
}
/* For release retention */
__raw_writel((1 << 28), S5P_PAD_RET_MAUDIO_OPTION);
__raw_writel((1 << 28), S5P_PAD_RET_GPIO_OPTION);
__raw_writel((1 << 28), S5P_PAD_RET_UART_OPTION);
__raw_writel((1 << 28), S5P_PAD_RET_MMCA_OPTION);
__raw_writel((1 << 28), S5P_PAD_RET_MMCB_OPTION);
__raw_writel((1 << 28), S5P_PAD_RET_EBIA_OPTION);
__raw_writel((1 << 28), S5P_PAD_RET_EBIB_OPTION);
if (soc_is_exynos5250())
s3c_pm_do_restore(exynos5_sys_save,
ARRAY_SIZE(exynos5_sys_save));
s3c_pm_do_restore_core(exynos_core_save, ARRAY_SIZE(exynos_core_save));
if (IS_ENABLED(CONFIG_SMP) && !soc_is_exynos5250())
scu_enable(S5P_VA_SCU);
early_wakeup:
/* Clear SLEEP mode set in INFORM1 */
__raw_writel(0x0, S5P_INFORM1);
return;
}
static struct syscore_ops exynos_pm_syscore_ops = {
.suspend = exynos_pm_suspend,
.resume = exynos_pm_resume,
};
/*
* Suspend Ops
*/
static int exynos_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__,
exynos_irqwake_intmask, exynos_get_eint_wake_mask());
if (exynos_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();
exynos_pm_prepare();
flush_cache_all();
s3c_pm_check_store();
ret = cpu_suspend(0, exynos_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 exynos_suspend_prepare(void)
{
s3c_pm_check_prepare();
return 0;
}
static void exynos_suspend_finish(void)
{
s3c_pm_check_cleanup();
}
static const struct platform_suspend_ops exynos_suspend_ops = {
.enter = exynos_suspend_enter,
.prepare = exynos_suspend_prepare,
.finish = exynos_suspend_finish,
.valid = suspend_valid_only_mem,
};
void __init exynos_pm_init(void)
{
u32 tmp;
/* All wakeup disable */
tmp = __raw_readl(S5P_WAKEUP_MASK);
tmp |= ((0xFF << 8) | (0x1F << 1));
__raw_writel(tmp, S5P_WAKEUP_MASK);
register_syscore_ops(&exynos_pm_syscore_ops);
suspend_set_ops(&exynos_suspend_ops);
}
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