1 /* 2 * dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer 3 * 4 * Copyright (C) 2013 Chen-Yu Tsai 5 * 6 * Chen-Yu Tsai <wens@csie.org> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 */ 18 19 #include <linux/stmmac.h> 20 #include <linux/clk.h> 21 #include <linux/module.h> 22 #include <linux/phy.h> 23 #include <linux/platform_device.h> 24 #include <linux/of_net.h> 25 #include <linux/regulator/consumer.h> 26 27 #include "stmmac_platform.h" 28 29 struct sunxi_priv_data { 30 int interface; 31 int clk_enabled; 32 struct clk *tx_clk; 33 struct regulator *regulator; 34 }; 35 36 #define SUN7I_GMAC_GMII_RGMII_RATE 125000000 37 #define SUN7I_GMAC_MII_RATE 25000000 38 39 static int sun7i_gmac_init(struct platform_device *pdev, void *priv) 40 { 41 struct sunxi_priv_data *gmac = priv; 42 int ret; 43 44 if (gmac->regulator) { 45 ret = regulator_enable(gmac->regulator); 46 if (ret) 47 return ret; 48 } 49 50 /* Set GMAC interface port mode 51 * 52 * The GMAC TX clock lines are configured by setting the clock 53 * rate, which then uses the auto-reparenting feature of the 54 * clock driver, and enabling/disabling the clock. 55 */ 56 if (gmac->interface == PHY_INTERFACE_MODE_RGMII) { 57 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE); 58 clk_prepare_enable(gmac->tx_clk); 59 gmac->clk_enabled = 1; 60 } else { 61 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE); 62 ret = clk_prepare(gmac->tx_clk); 63 if (ret) 64 return ret; 65 } 66 67 return 0; 68 } 69 70 static void sun7i_gmac_exit(struct platform_device *pdev, void *priv) 71 { 72 struct sunxi_priv_data *gmac = priv; 73 74 if (gmac->clk_enabled) { 75 clk_disable(gmac->tx_clk); 76 gmac->clk_enabled = 0; 77 } 78 clk_unprepare(gmac->tx_clk); 79 80 if (gmac->regulator) 81 regulator_disable(gmac->regulator); 82 } 83 84 static void sun7i_fix_speed(void *priv, unsigned int speed) 85 { 86 struct sunxi_priv_data *gmac = priv; 87 88 /* only GMII mode requires us to reconfigure the clock lines */ 89 if (gmac->interface != PHY_INTERFACE_MODE_GMII) 90 return; 91 92 if (gmac->clk_enabled) { 93 clk_disable(gmac->tx_clk); 94 gmac->clk_enabled = 0; 95 } 96 clk_unprepare(gmac->tx_clk); 97 98 if (speed == 1000) { 99 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE); 100 clk_prepare_enable(gmac->tx_clk); 101 gmac->clk_enabled = 1; 102 } else { 103 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE); 104 clk_prepare(gmac->tx_clk); 105 } 106 } 107 108 static int sun7i_gmac_probe(struct platform_device *pdev) 109 { 110 struct plat_stmmacenet_data *plat_dat; 111 struct stmmac_resources stmmac_res; 112 struct sunxi_priv_data *gmac; 113 struct device *dev = &pdev->dev; 114 int ret; 115 116 ret = stmmac_get_platform_resources(pdev, &stmmac_res); 117 if (ret) 118 return ret; 119 120 plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac); 121 if (IS_ERR(plat_dat)) 122 return PTR_ERR(plat_dat); 123 124 gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL); 125 if (!gmac) { 126 ret = -ENOMEM; 127 goto err_remove_config_dt; 128 } 129 130 gmac->interface = of_get_phy_mode(dev->of_node); 131 132 gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx"); 133 if (IS_ERR(gmac->tx_clk)) { 134 dev_err(dev, "could not get tx clock\n"); 135 ret = PTR_ERR(gmac->tx_clk); 136 goto err_remove_config_dt; 137 } 138 139 /* Optional regulator for PHY */ 140 gmac->regulator = devm_regulator_get_optional(dev, "phy"); 141 if (IS_ERR(gmac->regulator)) { 142 if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER) { 143 ret = -EPROBE_DEFER; 144 goto err_remove_config_dt; 145 } 146 dev_info(dev, "no regulator found\n"); 147 gmac->regulator = NULL; 148 } 149 150 /* platform data specifying hardware features and callbacks. 151 * hardware features were copied from Allwinner drivers. */ 152 plat_dat->tx_coe = 1; 153 plat_dat->has_gmac = true; 154 plat_dat->bsp_priv = gmac; 155 plat_dat->init = sun7i_gmac_init; 156 plat_dat->exit = sun7i_gmac_exit; 157 plat_dat->fix_mac_speed = sun7i_fix_speed; 158 159 ret = sun7i_gmac_init(pdev, plat_dat->bsp_priv); 160 if (ret) 161 goto err_remove_config_dt; 162 163 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); 164 if (ret) 165 goto err_gmac_exit; 166 167 return 0; 168 169 err_gmac_exit: 170 sun7i_gmac_exit(pdev, plat_dat->bsp_priv); 171 err_remove_config_dt: 172 stmmac_remove_config_dt(pdev, plat_dat); 173 174 return ret; 175 } 176 177 static const struct of_device_id sun7i_dwmac_match[] = { 178 { .compatible = "allwinner,sun7i-a20-gmac" }, 179 { } 180 }; 181 MODULE_DEVICE_TABLE(of, sun7i_dwmac_match); 182 183 static struct platform_driver sun7i_dwmac_driver = { 184 .probe = sun7i_gmac_probe, 185 .remove = stmmac_pltfr_remove, 186 .driver = { 187 .name = "sun7i-dwmac", 188 .pm = &stmmac_pltfr_pm_ops, 189 .of_match_table = sun7i_dwmac_match, 190 }, 191 }; 192 module_platform_driver(sun7i_dwmac_driver); 193 194 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>"); 195 MODULE_DESCRIPTION("Allwinner sunxi DWMAC specific glue layer"); 196 MODULE_LICENSE("GPL"); 197