linux/drivers/clk/ingenic/pm.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2019 Paul Cercueil <paul@crapouillou.net>
 */

#include "cgu.h"
#include "pm.h"

#include <linux/io.h>
#include <linux/syscore_ops.h>

#define CGU_REG_LCR		0x04

#define LCR_LOW_POWER_MODE	BIT(0)

static void __iomem * __maybe_unused ingenic_cgu_base;

static int __maybe_unused ingenic_cgu_pm_suspend(void)
{
	u32 val = readl(ingenic_cgu_base + CGU_REG_LCR);

	writel(val | LCR_LOW_POWER_MODE, ingenic_cgu_base + CGU_REG_LCR);

	return 0;
}

static void __maybe_unused ingenic_cgu_pm_resume(void)
{
	u32 val = readl(ingenic_cgu_base + CGU_REG_LCR);

	writel(val & ~LCR_LOW_POWER_MODE, ingenic_cgu_base + CGU_REG_LCR);
}

static struct syscore_ops __maybe_unused ingenic_cgu_pm_ops = {
	.suspend = ingenic_cgu_pm_suspend,
	.resume = ingenic_cgu_pm_resume,
};

void ingenic_cgu_register_syscore_ops(struct ingenic_cgu *cgu)
{
	if (IS_ENABLED(CONFIG_PM_SLEEP)) {
		ingenic_cgu_base = cgu->base;
		register_syscore_ops(&ingenic_cgu_pm_ops);
	}
}