// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2012 Calxeda, Inc.
 *
 * Based on arch/arm/plat-mxc/cpuidle.c: #v3.7
 * Copyright 2012 Freescale Semiconductor, Inc.
 * Copyright 2012 Linaro Ltd.
 *
 * Maintainer: Rob Herring <rob.herring@calxeda.com>
 */

#include <linux/cpuidle.h>
#include <linux/cpu_pm.h>
#include <linux/init.h>
#include <linux/mm.h>
#include <linux/platform_device.h>
#include <linux/psci.h>

#include <asm/cpuidle.h>
#include <asm/suspend.h>

#include <uapi/linux/psci.h>

#define CALXEDA_IDLE_PARAM \
        ((0 << PSCI_0_2_POWER_STATE_ID_SHIFT) | \
         (0 << PSCI_0_2_POWER_STATE_AFFL_SHIFT) | \
         (PSCI_POWER_STATE_TYPE_POWER_DOWN << PSCI_0_2_POWER_STATE_TYPE_SHIFT))

static int calxeda_idle_finish(unsigned long val)
{
        return psci_ops.cpu_suspend(CALXEDA_IDLE_PARAM, __pa(cpu_resume));
}

static int calxeda_pwrdown_idle(struct cpuidle_device *dev,
                                struct cpuidle_driver *drv,
                                int index)
{
        cpu_pm_enter();
        cpu_suspend(0, calxeda_idle_finish);
        cpu_pm_exit();

        return index;
}

static struct cpuidle_driver calxeda_idle_driver = {
        .name = "calxeda_idle",
        .states = {
                ARM_CPUIDLE_WFI_STATE,
                {
                        .name = "PG",
                        .desc = "Power Gate",
                        .exit_latency = 30,
                        .power_usage = 50,
                        .target_residency = 200,
                        .enter = calxeda_pwrdown_idle,
                },
        },
        .state_count = 2,
};

static int calxeda_cpuidle_probe(struct platform_device *pdev)
{
        return cpuidle_register(&calxeda_idle_driver, NULL);
}

static struct platform_driver calxeda_cpuidle_plat_driver = {
        .driver = {
                .name = "cpuidle-calxeda",
        },
        .probe = calxeda_cpuidle_probe,
};
builtin_platform_driver(calxeda_cpuidle_plat_driver);