/*
 * DWMAC glue for NXP LPC18xx/LPC43xx Ethernet
 *
 * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
 *
 * This file is licensed under the terms of the GNU General Public
 * License version 2. This program is licensed "as is" without any
 * warranty of any kind, whether express or implied.
 */

#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_net.h>
#include <linux/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/stmmac.h>

#include "stmmac_platform.h"

/* Register defines for CREG syscon */
#define LPC18XX_CREG_CREG6                      0x12c
# define LPC18XX_CREG_CREG6_ETHMODE_MASK        GENMASK(2, 0)

static int lpc18xx_set_phy_intf_sel(void *bsp_priv, u8 phy_intf_sel)
{
        struct regmap *reg = bsp_priv;

        if (phy_intf_sel != PHY_INTF_SEL_GMII_MII &&
            phy_intf_sel != PHY_INTF_SEL_RMII)
                return -EINVAL;

        regmap_update_bits(reg, LPC18XX_CREG_CREG6,
                           LPC18XX_CREG_CREG6_ETHMODE_MASK,
                           FIELD_PREP(LPC18XX_CREG_CREG6_ETHMODE_MASK,
                                      phy_intf_sel));

        return 0;
}

static int lpc18xx_dwmac_probe(struct platform_device *pdev)
{
        struct plat_stmmacenet_data *plat_dat;
        struct stmmac_resources stmmac_res;
        struct regmap *regmap;
        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);

        plat_dat->core_type = DWMAC_CORE_GMAC;

        regmap = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");
        if (IS_ERR(regmap)) {
                dev_err(&pdev->dev, "syscon lookup failed\n");
                return PTR_ERR(regmap);
        }

        plat_dat->bsp_priv = regmap;
        plat_dat->set_phy_intf_sel = lpc18xx_set_phy_intf_sel;

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

static const struct of_device_id lpc18xx_dwmac_match[] = {
        { .compatible = "nxp,lpc1850-dwmac" },
        { }
};
MODULE_DEVICE_TABLE(of, lpc18xx_dwmac_match);

static struct platform_driver lpc18xx_dwmac_driver = {
        .probe  = lpc18xx_dwmac_probe,
        .remove = stmmac_pltfr_remove,
        .driver = {
                .name           = "lpc18xx-dwmac",
                .pm             = &stmmac_pltfr_pm_ops,
                .of_match_table = lpc18xx_dwmac_match,
        },
};
module_platform_driver(lpc18xx_dwmac_driver);

MODULE_AUTHOR("Joachim Eastwood <manabian@gmail.com>");
MODULE_DESCRIPTION("DWMAC glue for LPC18xx/43xx Ethernet");
MODULE_LICENSE("GPL v2");