// SPDX-License-Identifier: GPL-2.0
/*
 * dwc3-of-simple.c - OF glue layer for simple integrations
 *
 * Copyright (c) 2015 Texas Instruments Incorporated - https://www.ti.com
 *
 * Author: Felipe Balbi <balbi@ti.com>
 *
 * This is a combination of the old dwc3-qcom.c by Ivan T. Ivanov
 * <iivanov@mm-sol.com> and the original patch adding support for Xilinx' SoC
 * by Subbaraya Sundeep Bhatta <subbaraya.sundeep.bhatta@xilinx.com>
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>

struct dwc3_of_simple {
        struct device           *dev;
        struct clk_bulk_data    *clks;
        int                     num_clocks;
        struct reset_control    *resets;
        bool                    need_reset;
};

static int dwc3_of_simple_probe(struct platform_device *pdev)
{
        struct dwc3_of_simple   *simple;
        struct device           *dev = &pdev->dev;
        struct device_node      *np = dev->of_node;

        int                     ret;

        simple = devm_kzalloc(dev, sizeof(*simple), GFP_KERNEL);
        if (!simple)
                return -ENOMEM;

        platform_set_drvdata(pdev, simple);
        simple->dev = dev;

        /*
         * Some controllers need to toggle the usb3-otg reset before trying to
         * initialize the PHY, otherwise the PHY times out.
         */
        if (of_device_is_compatible(np, "rockchip,rk3399-dwc3"))
                simple->need_reset = true;

        simple->resets = of_reset_control_array_get_optional_exclusive(np);
        if (IS_ERR(simple->resets)) {
                ret = PTR_ERR(simple->resets);
                dev_err(dev, "failed to get device resets, err=%d\n", ret);
                return ret;
        }

        ret = reset_control_deassert(simple->resets);
        if (ret)
                goto err_resetc_put;

        ret = clk_bulk_get_all(simple->dev, &simple->clks);
        if (ret < 0)
                goto err_resetc_assert;

        simple->num_clocks = ret;
        ret = clk_bulk_prepare_enable(simple->num_clocks, simple->clks);
        if (ret)
                goto err_clk_put_all;

        ret = of_platform_populate(np, NULL, NULL, dev);
        if (ret)
                goto err_clk_disable;

        pm_runtime_set_active(dev);
        pm_runtime_enable(dev);
        pm_runtime_get_sync(dev);

        return 0;

err_clk_disable:
        clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
err_clk_put_all:
        clk_bulk_put_all(simple->num_clocks, simple->clks);

err_resetc_assert:
        reset_control_assert(simple->resets);

err_resetc_put:
        reset_control_put(simple->resets);
        return ret;
}

static void __dwc3_of_simple_teardown(struct dwc3_of_simple *simple)
{
        of_platform_depopulate(simple->dev);

        clk_bulk_disable_unprepare(simple->num_clocks, simple->clks);
        clk_bulk_put_all(simple->num_clocks, simple->clks);
        simple->num_clocks = 0;

        reset_control_assert(simple->resets);

        reset_control_put(simple->resets);

        pm_runtime_disable(simple->dev);
        pm_runtime_put_noidle(simple->dev);
        pm_runtime_set_suspended(simple->dev);
}

static void dwc3_of_simple_remove(struct platform_device *pdev)
{
        struct dwc3_of_simple   *simple = platform_get_drvdata(pdev);

        __dwc3_of_simple_teardown(simple);
}

static void dwc3_of_simple_shutdown(struct platform_device *pdev)
{
        struct dwc3_of_simple   *simple = platform_get_drvdata(pdev);

        __dwc3_of_simple_teardown(simple);
}

static int __maybe_unused dwc3_of_simple_runtime_suspend(struct device *dev)
{
        struct dwc3_of_simple   *simple = dev_get_drvdata(dev);

        clk_bulk_disable(simple->num_clocks, simple->clks);

        return 0;
}

static int __maybe_unused dwc3_of_simple_runtime_resume(struct device *dev)
{
        struct dwc3_of_simple   *simple = dev_get_drvdata(dev);

        return clk_bulk_enable(simple->num_clocks, simple->clks);
}

static int __maybe_unused dwc3_of_simple_suspend(struct device *dev)
{
        struct dwc3_of_simple *simple = dev_get_drvdata(dev);

        if (simple->need_reset)
                reset_control_assert(simple->resets);

        return 0;
}

static int __maybe_unused dwc3_of_simple_resume(struct device *dev)
{
        struct dwc3_of_simple *simple = dev_get_drvdata(dev);

        if (simple->need_reset)
                reset_control_deassert(simple->resets);

        return 0;
}

static const struct dev_pm_ops dwc3_of_simple_dev_pm_ops = {
        SET_SYSTEM_SLEEP_PM_OPS(dwc3_of_simple_suspend, dwc3_of_simple_resume)
        SET_RUNTIME_PM_OPS(dwc3_of_simple_runtime_suspend,
                        dwc3_of_simple_runtime_resume, NULL)
};

static const struct of_device_id of_dwc3_simple_match[] = {
        { .compatible = "rockchip,rk3399-dwc3" },
        { .compatible = "sprd,sc9860-dwc3" },
        { .compatible = "allwinner,sun50i-h6-dwc3" },
        { .compatible = "hisilicon,hi3670-dwc3" },
        { .compatible = "hisilicon,hi3798mv200-dwc3" },
        { .compatible = "intel,keembay-dwc3" },
        { /* Sentinel */ }
};
MODULE_DEVICE_TABLE(of, of_dwc3_simple_match);

static struct platform_driver dwc3_of_simple_driver = {
        .probe          = dwc3_of_simple_probe,
        .remove         = dwc3_of_simple_remove,
        .shutdown       = dwc3_of_simple_shutdown,
        .driver         = {
                .name   = "dwc3-of-simple",
                .of_match_table = of_dwc3_simple_match,
                .pm     = &dwc3_of_simple_dev_pm_ops,
        },
};

module_platform_driver(dwc3_of_simple_driver);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("DesignWare USB3 OF Simple Glue Layer");
MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");