stmicro/stmmac/dwmac-sunxi.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer
0004  *
0005  * Copyright (C) 2013 Chen-Yu Tsai
0006  *
0007  * Chen-Yu Tsai  <wens@csie.org>
0008  */
0009
0010 #include <linux/stmmac.h>
0011 #include <linux/clk.h>
0012 #include <linux/module.h>
0013 #include <linux/phy.h>
0014 #include <linux/platform_device.h>
0015 #include <linux/of_net.h>
0016 #include <linux/regulator/consumer.h>
0017
0018 #include "stmmac_platform.h"
0019
0020 struct sunxi_priv_data {
0021     phy_interface_t interface;
0022     int clk_enabled;
0023     struct clk *tx_clk;
0024     struct regulator *regulator;
0025 };
0026
0027 #define SUN7I_GMAC_GMII_RGMII_RATE  125000000
0028 #define SUN7I_GMAC_MII_RATE     25000000
0029
0030 static int sun7i_gmac_init(struct platform_device *pdev, void *priv)
0031 {
0032     struct sunxi_priv_data *gmac = priv;
0033     int ret = 0;
0034
0035     if (gmac->regulator) {
0036         ret = regulator_enable(gmac->regulator);
0037         if (ret)
0038             return ret;
0039     }
0040
0041     /* Set GMAC interface port mode
0042      *
0043      * The GMAC TX clock lines are configured by setting the clock
0044      * rate, which then uses the auto-reparenting feature of the
0045      * clock driver, and enabling/disabling the clock.
0046      */
0047     if (phy_interface_mode_is_rgmii(gmac->interface)) {
0048         clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
0049         clk_prepare_enable(gmac->tx_clk);
0050         gmac->clk_enabled = 1;
0051     } else {
0052         clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
0053         ret = clk_prepare(gmac->tx_clk);
0054         if (ret && gmac->regulator)
0055             regulator_disable(gmac->regulator);
0056     }
0057
0058     return ret;
0059 }
0060
0061 static void sun7i_gmac_exit(struct platform_device *pdev, void *priv)
0062 {
0063     struct sunxi_priv_data *gmac = priv;
0064
0065     if (gmac->clk_enabled) {
0066         clk_disable(gmac->tx_clk);
0067         gmac->clk_enabled = 0;
0068     }
0069     clk_unprepare(gmac->tx_clk);
0070
0071     if (gmac->regulator)
0072         regulator_disable(gmac->regulator);
0073 }
0074
0075 static void sun7i_fix_speed(void *priv, unsigned int speed)
0076 {
0077     struct sunxi_priv_data *gmac = priv;
0078
0079     /* only GMII mode requires us to reconfigure the clock lines */
0080     if (gmac->interface != PHY_INTERFACE_MODE_GMII)
0081         return;
0082
0083     if (gmac->clk_enabled) {
0084         clk_disable(gmac->tx_clk);
0085         gmac->clk_enabled = 0;
0086     }
0087     clk_unprepare(gmac->tx_clk);
0088
0089     if (speed == 1000) {
0090         clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE);
0091         clk_prepare_enable(gmac->tx_clk);
0092         gmac->clk_enabled = 1;
0093     } else {
0094         clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE);
0095         clk_prepare(gmac->tx_clk);
0096     }
0097 }
0098
0099 static int sun7i_gmac_probe(struct platform_device *pdev)
0100 {
0101     struct plat_stmmacenet_data *plat_dat;
0102     struct stmmac_resources stmmac_res;
0103     struct sunxi_priv_data *gmac;
0104     struct device *dev = &pdev->dev;
0105     int ret;
0106
0107     ret = stmmac_get_platform_resources(pdev, &stmmac_res);
0108     if (ret)
0109         return ret;
0110
0111     plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac);
0112     if (IS_ERR(plat_dat))
0113         return PTR_ERR(plat_dat);
0114
0115     gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL);
0116     if (!gmac) {
0117         ret = -ENOMEM;
0118         goto err_remove_config_dt;
0119     }
0120
0121     ret = of_get_phy_mode(dev->of_node, &gmac->interface);
0122     if (ret && ret != -ENODEV) {
0123         dev_err(dev, "Can't get phy-mode\n");
0124         goto err_remove_config_dt;
0125     }
0126
0127     gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx");
0128     if (IS_ERR(gmac->tx_clk)) {
0129         dev_err(dev, "could not get tx clock\n");
0130         ret = PTR_ERR(gmac->tx_clk);
0131         goto err_remove_config_dt;
0132     }
0133
0134     /* Optional regulator for PHY */
0135     gmac->regulator = devm_regulator_get_optional(dev, "phy");
0136     if (IS_ERR(gmac->regulator)) {
0137         if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER) {
0138             ret = -EPROBE_DEFER;
0139             goto err_remove_config_dt;
0140         }
0141         dev_info(dev, "no regulator found\n");
0142         gmac->regulator = NULL;
0143     }
0144
0145     /* platform data specifying hardware features and callbacks.
0146      * hardware features were copied from Allwinner drivers. */
0147     plat_dat->tx_coe = 1;
0148     plat_dat->has_gmac = true;
0149     plat_dat->bsp_priv = gmac;
0150     plat_dat->init = sun7i_gmac_init;
0151     plat_dat->exit = sun7i_gmac_exit;
0152     plat_dat->fix_mac_speed = sun7i_fix_speed;
0153     plat_dat->tx_fifo_size = 4096;
0154     plat_dat->rx_fifo_size = 16384;
0155
0156     ret = sun7i_gmac_init(pdev, plat_dat->bsp_priv);
0157     if (ret)
0158         goto err_remove_config_dt;
0159
0160     ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
0161     if (ret)
0162         goto err_gmac_exit;
0163
0164     return 0;
0165
0166 err_gmac_exit:
0167     sun7i_gmac_exit(pdev, plat_dat->bsp_priv);
0168 err_remove_config_dt:
0169     stmmac_remove_config_dt(pdev, plat_dat);
0170
0171     return ret;
0172 }
0173
0174 static const struct of_device_id sun7i_dwmac_match[] = {
0175     { .compatible = "allwinner,sun7i-a20-gmac" },
0176     { }
0177 };
0178 MODULE_DEVICE_TABLE(of, sun7i_dwmac_match);
0179
0180 static struct platform_driver sun7i_dwmac_driver = {
0181     .probe  = sun7i_gmac_probe,
0182     .remove = stmmac_pltfr_remove,
0183     .driver = {
0184         .name           = "sun7i-dwmac",
0185         .pm     = &stmmac_pltfr_pm_ops,
0186         .of_match_table = sun7i_dwmac_match,
0187     },
0188 };
0189 module_platform_driver(sun7i_dwmac_driver);
0190
0191 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
0192 MODULE_DESCRIPTION("Allwinner sunxi DWMAC specific glue layer");
0193 MODULE_LICENSE("GPL");