// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  CLPS711X CPU idle driver
 *
 *  Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
 */

#include <linux/cpuidle.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/platform_device.h>

#define CLPS711X_CPUIDLE_NAME   "clps711x-cpuidle"

static void __iomem *clps711x_halt;

static int clps711x_cpuidle_halt(struct cpuidle_device *dev,
                                 struct cpuidle_driver *drv, int index)
{
        writel(0xaa, clps711x_halt);

        return index;
}

static struct cpuidle_driver clps711x_idle_driver = {
        .name           = CLPS711X_CPUIDLE_NAME,
        .owner          = THIS_MODULE,
        .states[0]      = {
                .name           = "HALT",
                .desc           = "CLPS711X HALT",
                .enter          = clps711x_cpuidle_halt,
                .exit_latency   = 1,
        },
        .state_count    = 1,
};

static int __init clps711x_cpuidle_probe(struct platform_device *pdev)
{
        clps711x_halt = devm_platform_ioremap_resource(pdev, 0);
        if (IS_ERR(clps711x_halt))
                return PTR_ERR(clps711x_halt);

        return cpuidle_register(&clps711x_idle_driver, NULL);
}

static struct platform_driver clps711x_cpuidle_driver = {
        .driver = {
                .name   = CLPS711X_CPUIDLE_NAME,
        },
};
builtin_platform_driver_probe(clps711x_cpuidle_driver, clps711x_cpuidle_probe);