// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2023 Nuvoton Technology corporation.

#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/usb/chipidea.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/reset-controller.h>
#include <linux/of.h>

#include "ci.h"

struct npcm_udc_data {
        struct platform_device  *ci;
        struct clk              *core_clk;
        struct ci_hdrc_platform_data pdata;
};

static int npcm_udc_notify_event(struct ci_hdrc *ci, unsigned int event)
{
        struct device *dev = ci->dev->parent;

        switch (event) {
        case CI_HDRC_CONTROLLER_RESET_EVENT:
                /* clear all mode bits */
                hw_write(ci, OP_USBMODE, 0xffffffff, 0x0);
                break;
        default:
                dev_dbg(dev, "unknown ci_hdrc event (%d)\n", event);
                break;
        }

        return 0;
}

static int npcm_udc_probe(struct platform_device *pdev)
{
        int ret;
        struct npcm_udc_data *ci;
        struct platform_device *plat_ci;
        struct device *dev = &pdev->dev;

        ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
        if (!ci)
                return -ENOMEM;
        platform_set_drvdata(pdev, ci);

        ci->core_clk = devm_clk_get_optional(dev, NULL);
        if (IS_ERR(ci->core_clk))
                return PTR_ERR(ci->core_clk);

        ret = clk_prepare_enable(ci->core_clk);
        if (ret)
                return dev_err_probe(dev, ret, "failed to enable the clock: %d\n", ret);

        ci->pdata.name = dev_name(dev);
        ci->pdata.capoffset = DEF_CAPOFFSET;
        ci->pdata.flags = CI_HDRC_REQUIRES_ALIGNED_DMA |
                CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS;
        ci->pdata.phy_mode = USBPHY_INTERFACE_MODE_UTMI;
        ci->pdata.notify_event = npcm_udc_notify_event;

        plat_ci = ci_hdrc_add_device(dev, pdev->resource, pdev->num_resources,
                                     &ci->pdata);
        if (IS_ERR(plat_ci)) {
                ret = PTR_ERR(plat_ci);
                dev_err(dev, "failed to register HDRC NPCM device: %d\n", ret);
                goto clk_err;
        }

        pm_runtime_no_callbacks(dev);
        pm_runtime_enable(dev);

        return 0;

clk_err:
        clk_disable_unprepare(ci->core_clk);
        return ret;
}

static void npcm_udc_remove(struct platform_device *pdev)
{
        struct npcm_udc_data *ci = platform_get_drvdata(pdev);

        pm_runtime_disable(&pdev->dev);
        ci_hdrc_remove_device(ci->ci);
        clk_disable_unprepare(ci->core_clk);
}

static const struct of_device_id npcm_udc_dt_match[] = {
        { .compatible = "nuvoton,npcm750-udc", },
        { .compatible = "nuvoton,npcm845-udc", },
        { }
};
MODULE_DEVICE_TABLE(of, npcm_udc_dt_match);

static struct platform_driver npcm_udc_driver = {
        .probe = npcm_udc_probe,
        .remove = npcm_udc_remove,
        .driver = {
                .name = "npcm_udc",
                .of_match_table = npcm_udc_dt_match,
        },
};

module_platform_driver(npcm_udc_driver);

MODULE_DESCRIPTION("NPCM USB device controller driver");
MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
MODULE_LICENSE("GPL v2");