linux/arch/arm/mach-exynos/pm.c

/*
 * 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 <plat/cpu.h>
#include <plat/pm.h>
#include <plat/pll.h>
#include <plat/regs-srom.h>

#include <mach/map.h>
#include <mach/pm-core.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),
};


/* 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;

	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(s3c_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,
};

void __init exynos_pm_init(void)
{
	u32 tmp;

	pm_cpu_prep = exynos_pm_prepare;
	pm_cpu_sleep = exynos_cpu_suspend;

	s3c_pm_init();

	/* 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);
}