// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2010 Google, Inc.
 *
 * Author:
 *      Colin Cross <ccross@google.com>
 *      Based on arch/arm/plat-omap/cpu-omap.c, (C) 2005 Nokia Corporation
 */

#include <linux/bits.h>
#include <linux/cpu.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_opp.h>
#include <linux/types.h>

#include <soc/tegra/common.h>
#include <soc/tegra/fuse.h>

static bool cpu0_node_has_opp_v2_prop(void)
{
        struct device_node *np = of_cpu_device_node_get(0);
        bool ret = false;

        if (of_property_present(np, "operating-points-v2"))
                ret = true;

        of_node_put(np);
        return ret;
}

static void tegra20_cpufreq_put_supported_hw(void *opp_token)
{
        dev_pm_opp_put_supported_hw((unsigned long) opp_token);
}

static void tegra20_cpufreq_dt_unregister(void *cpufreq_dt)
{
        platform_device_unregister(cpufreq_dt);
}

static int tegra20_cpufreq_probe(struct platform_device *pdev)
{
        struct platform_device *cpufreq_dt;
        struct device *cpu_dev;
        u32 versions[2];
        int err;

        if (!cpu0_node_has_opp_v2_prop()) {
                dev_err(&pdev->dev, "operating points not found\n");
                dev_err(&pdev->dev, "please update your device tree\n");
                return -ENODEV;
        }

        if (of_machine_is_compatible("nvidia,tegra20")) {
                versions[0] = BIT(tegra_sku_info.cpu_process_id);
                versions[1] = BIT(tegra_sku_info.soc_speedo_id);
        } else {
                versions[0] = BIT(tegra_sku_info.cpu_process_id);
                versions[1] = BIT(tegra_sku_info.cpu_speedo_id);
        }

        dev_info(&pdev->dev, "hardware version 0x%x 0x%x\n",
                 versions[0], versions[1]);

        cpu_dev = get_cpu_device(0);
        if (WARN_ON(!cpu_dev))
                return -ENODEV;

        err = dev_pm_opp_set_supported_hw(cpu_dev, versions, 2);
        if (err < 0) {
                dev_err(&pdev->dev, "failed to set supported hw: %d\n", err);
                return err;
        }

        err = devm_add_action_or_reset(&pdev->dev,
                                       tegra20_cpufreq_put_supported_hw,
                                       (void *)((unsigned long) err));
        if (err)
                return err;

        cpufreq_dt = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
        err = PTR_ERR_OR_ZERO(cpufreq_dt);
        if (err) {
                dev_err(&pdev->dev,
                        "failed to create cpufreq-dt device: %d\n", err);
                return err;
        }

        err = devm_add_action_or_reset(&pdev->dev,
                                       tegra20_cpufreq_dt_unregister,
                                       cpufreq_dt);
        if (err)
                return err;

        return 0;
}

static struct platform_driver tegra20_cpufreq_driver = {
        .probe          = tegra20_cpufreq_probe,
        .driver         = {
                .name   = "tegra20-cpufreq",
        },
};
module_platform_driver(tegra20_cpufreq_driver);

MODULE_ALIAS("platform:tegra20-cpufreq");
MODULE_AUTHOR("Colin Cross <ccross@android.com>");
MODULE_DESCRIPTION("NVIDIA Tegra20 cpufreq driver");
MODULE_LICENSE("GPL");