// SPDX-License-Identifier: GPL-2.0
//
// Copyright (c) 2011 Wolfson Microelectronics, plc
// Copyright (c) 2011 Samsung Electronics Co., Ltd.
//              http://www.samsung.com

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/cpuidle.h>
#include <linux/io.h>
#include <linux/export.h>
#include <linux/time.h>

#include <asm/cpuidle.h>

#include "cpu.h"
#include "map.h"

#include "regs-sys-s3c64xx.h"
#include "regs-syscon-power-s3c64xx.h"

static __cpuidle int s3c64xx_enter_idle(struct cpuidle_device *dev,
                                        struct cpuidle_driver *drv, int index)
{
        unsigned long tmp;

        /* Setup PWRCFG to enter idle mode */
        tmp = __raw_readl(S3C64XX_PWR_CFG);
        tmp &= ~S3C64XX_PWRCFG_CFG_WFI_MASK;
        tmp |= S3C64XX_PWRCFG_CFG_WFI_IDLE;
        __raw_writel(tmp, S3C64XX_PWR_CFG);

        cpu_do_idle();

        return index;
}

static struct cpuidle_driver s3c64xx_cpuidle_driver = {
        .name   = "s3c64xx_cpuidle",
        .owner  = THIS_MODULE,
        .states = {
                {
                        .enter            = s3c64xx_enter_idle,
                        .exit_latency     = 1,
                        .target_residency = 1,
                        .name             = "IDLE",
                        .desc             = "System active, ARM gated",
                },
        },
        .state_count = 1,
};

static int __init s3c64xx_init_cpuidle(void)
{
        if (soc_is_s3c64xx())
                return cpuidle_register(&s3c64xx_cpuidle_driver, NULL);
        return 0;
}
device_initcall(s3c64xx_init_cpuidle);