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- /*
- * dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer
- *
- * Copyright (C) 2013 Chen-Yu Tsai
- *
- * Chen-Yu Tsai <wens@csie.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- */
- #include <linux/stmmac.h>
- #include <linux/clk.h>
- #include <linux/module.h>
- #include <linux/phy.h>
- #include <linux/platform_device.h>
- #include <linux/of_net.h>
- #include <linux/regulator/consumer.h>
- #include "stmmac_platform.h"
- struct sunxi_priv_data {
- int interface;
- int clk_enabled;
- struct clk *tx_clk;
- struct regulator *regulator;
- };
- #define SUN7I_GMAC_GMII_RGMII_RATE 125000000
- #define SUN7I_GMAC_MII_RATE 25000000
- static int sun7i_gmac_init(struct platform_device *pdev, void *priv)
- {
- struct sunxi_priv_data *gmac = priv;
- int ret;
- if (gmac->regulator) {
- ret = regulator_enable(gmac->regulator);
- if (ret)
- return ret;
- }
- /* Set GMAC interface port mode
- *
- * The GMAC TX clock lines are configured by setting the clock
- * rate, which then uses the auto-reparenting feature of the
- * clock driver, and enabling/disabling the clock.
- */
- if (gmac->interface == PHY_INTERFACE_MODE_RGMII) {
- clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
- clk_prepare_enable(gmac->tx_clk);
- gmac->clk_enabled = 1;
- } else {
- clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
- clk_prepare(gmac->tx_clk);
- }
- return 0;
- }
- static void sun7i_gmac_exit(struct platform_device *pdev, void *priv)
- {
- struct sunxi_priv_data *gmac = priv;
- if (gmac->clk_enabled) {
- clk_disable(gmac->tx_clk);
- gmac->clk_enabled = 0;
- }
- clk_unprepare(gmac->tx_clk);
- if (gmac->regulator)
- regulator_disable(gmac->regulator);
- }
- static void sun7i_fix_speed(void *priv, unsigned int speed)
- {
- struct sunxi_priv_data *gmac = priv;
- /* only GMII mode requires us to reconfigure the clock lines */
- if (gmac->interface != PHY_INTERFACE_MODE_GMII)
- return;
- if (gmac->clk_enabled) {
- clk_disable(gmac->tx_clk);
- gmac->clk_enabled = 0;
- }
- clk_unprepare(gmac->tx_clk);
- if (speed == 1000) {
- clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
- clk_prepare_enable(gmac->tx_clk);
- gmac->clk_enabled = 1;
- } else {
- clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
- clk_prepare(gmac->tx_clk);
- }
- }
- static int sun7i_gmac_probe(struct platform_device *pdev)
- {
- struct plat_stmmacenet_data *plat_dat;
- struct stmmac_resources stmmac_res;
- struct sunxi_priv_data *gmac;
- struct device *dev = &pdev->dev;
- int ret;
- ret = stmmac_get_platform_resources(pdev, &stmmac_res);
- if (ret)
- return ret;
- plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac);
- if (IS_ERR(plat_dat))
- return PTR_ERR(plat_dat);
- gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
- if (!gmac) {
- ret = -ENOMEM;
- goto err_remove_config_dt;
- }
- gmac->interface = of_get_phy_mode(dev->of_node);
- gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx");
- if (IS_ERR(gmac->tx_clk)) {
- dev_err(dev, "could not get tx clock\n");
- ret = PTR_ERR(gmac->tx_clk);
- goto err_remove_config_dt;
- }
- /* Optional regulator for PHY */
- gmac->regulator = devm_regulator_get_optional(dev, "phy");
- if (IS_ERR(gmac->regulator)) {
- if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER) {
- ret = -EPROBE_DEFER;
- goto err_remove_config_dt;
- }
- dev_info(dev, "no regulator found\n");
- gmac->regulator = NULL;
- }
- /* platform data specifying hardware features and callbacks.
- * hardware features were copied from Allwinner drivers. */
- plat_dat->tx_coe = 1;
- plat_dat->has_gmac = true;
- plat_dat->bsp_priv = gmac;
- plat_dat->init = sun7i_gmac_init;
- plat_dat->exit = sun7i_gmac_exit;
- plat_dat->fix_mac_speed = sun7i_fix_speed;
- ret = sun7i_gmac_init(pdev, plat_dat->bsp_priv);
- if (ret)
- goto err_remove_config_dt;
- ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
- if (ret)
- goto err_gmac_exit;
- return 0;
- err_gmac_exit:
- sun7i_gmac_exit(pdev, plat_dat->bsp_priv);
- err_remove_config_dt:
- stmmac_remove_config_dt(pdev, plat_dat);
- return ret;
- }
- static const struct of_device_id sun7i_dwmac_match[] = {
- { .compatible = "allwinner,sun7i-a20-gmac" },
- { }
- };
- MODULE_DEVICE_TABLE(of, sun7i_dwmac_match);
- static struct platform_driver sun7i_dwmac_driver = {
- .probe = sun7i_gmac_probe,
- .remove = stmmac_pltfr_remove,
- .driver = {
- .name = "sun7i-dwmac",
- .pm = &stmmac_pltfr_pm_ops,
- .of_match_table = sun7i_dwmac_match,
- },
- };
- module_platform_driver(sun7i_dwmac_driver);
- MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
- MODULE_DESCRIPTION("Allwinner sunxi DWMAC specific glue layer");
- MODULE_LICENSE("GPL");
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