// SPDX-License-Identifier: GPL-2.0-only
/*
 * Amlogic Meson6 and Meson8 DWMAC glue layer
 *
 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com>
 */

#include <linux/device.h>
#include <linux/ethtool.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/stmmac.h>

#include "stmmac_platform.h"

#define ETHMAC_SPEED_100        BIT(1)

struct meson_dwmac {
        struct device   *dev;
        void __iomem    *reg;
};

static int meson6_dwmac_set_clk_tx_rate(void *bsp_priv, struct clk *clk_tx_i,
                                        phy_interface_t interface, int speed)
{
        struct meson_dwmac *dwmac = bsp_priv;
        unsigned int val;

        val = readl(dwmac->reg);

        switch (speed) {
        case SPEED_10:
                val &= ~ETHMAC_SPEED_100;
                break;
        case SPEED_100:
                val |= ETHMAC_SPEED_100;
                break;
        }

        writel(val, dwmac->reg);

        return 0;
}

static int meson6_dwmac_probe(struct platform_device *pdev)
{
        struct plat_stmmacenet_data *plat_dat;
        struct stmmac_resources stmmac_res;
        struct meson_dwmac *dwmac;
        int ret;

        ret = stmmac_get_platform_resources(pdev, &stmmac_res);
        if (ret)
                return ret;

        plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);
        if (IS_ERR(plat_dat))
                return PTR_ERR(plat_dat);

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

        dwmac->reg = devm_platform_ioremap_resource(pdev, 1);
        if (IS_ERR(dwmac->reg))
                return PTR_ERR(dwmac->reg);

        plat_dat->bsp_priv = dwmac;
        plat_dat->set_clk_tx_rate = meson6_dwmac_set_clk_tx_rate;

        return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
}

static const struct of_device_id meson6_dwmac_match[] = {
        { .compatible = "amlogic,meson6-dwmac" },
        { }
};
MODULE_DEVICE_TABLE(of, meson6_dwmac_match);

static struct platform_driver meson6_dwmac_driver = {
        .probe  = meson6_dwmac_probe,
        .remove = stmmac_pltfr_remove,
        .driver = {
                .name           = "meson6-dwmac",
                .pm             = &stmmac_pltfr_pm_ops,
                .of_match_table = meson6_dwmac_match,
        },
};
module_platform_driver(meson6_dwmac_driver);

MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>");
MODULE_DESCRIPTION("Amlogic Meson6 and Meson8 DWMAC glue layer");
MODULE_LICENSE("GPL v2");