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/phy.h> 22 #include <linux/of_net.h> 23 #include <linux/regulator/consumer.h> 24 25 #include "stmmac_platform.h" 26 27 struct sunxi_priv_data { 28 int interface; 29 int clk_enabled; 30 struct clk *tx_clk; 31 struct regulator *regulator; 32 }; 33 34 static void *sun7i_gmac_setup(struct platform_device *pdev) 35 { 36 struct sunxi_priv_data *gmac; 37 struct device *dev = &pdev->dev; 38 39 gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL); 40 if (!gmac) 41 return ERR_PTR(-ENOMEM); 42 43 gmac->interface = of_get_phy_mode(dev->of_node); 44 45 gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx"); 46 if (IS_ERR(gmac->tx_clk)) { 47 dev_err(dev, "could not get tx clock\n"); 48 return gmac->tx_clk; 49 } 50 51 /* Optional regulator for PHY */ 52 gmac->regulator = devm_regulator_get_optional(dev, "phy"); 53 if (IS_ERR(gmac->regulator)) { 54 if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER) 55 return ERR_PTR(-EPROBE_DEFER); 56 dev_info(dev, "no regulator found\n"); 57 gmac->regulator = NULL; 58 } 59 60 return gmac; 61 } 62 63 #define SUN7I_GMAC_GMII_RGMII_RATE 125000000 64 #define SUN7I_GMAC_MII_RATE 25000000 65 66 static int sun7i_gmac_init(struct platform_device *pdev, void *priv) 67 { 68 struct sunxi_priv_data *gmac = priv; 69 int ret; 70 71 if (gmac->regulator) { 72 ret = regulator_enable(gmac->regulator); 73 if (ret) 74 return ret; 75 } 76 77 /* Set GMAC interface port mode 78 * 79 * The GMAC TX clock lines are configured by setting the clock 80 * rate, which then uses the auto-reparenting feature of the 81 * clock driver, and enabling/disabling the clock. 82 */ 83 if (gmac->interface == PHY_INTERFACE_MODE_RGMII) { 84 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE); 85 clk_prepare_enable(gmac->tx_clk); 86 gmac->clk_enabled = 1; 87 } else { 88 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE); 89 clk_prepare(gmac->tx_clk); 90 } 91 92 return 0; 93 } 94 95 static void sun7i_gmac_exit(struct platform_device *pdev, void *priv) 96 { 97 struct sunxi_priv_data *gmac = priv; 98 99 if (gmac->clk_enabled) { 100 clk_disable(gmac->tx_clk); 101 gmac->clk_enabled = 0; 102 } 103 clk_unprepare(gmac->tx_clk); 104 105 if (gmac->regulator) 106 regulator_disable(gmac->regulator); 107 } 108 109 static void sun7i_fix_speed(void *priv, unsigned int speed) 110 { 111 struct sunxi_priv_data *gmac = priv; 112 113 /* only GMII mode requires us to reconfigure the clock lines */ 114 if (gmac->interface != PHY_INTERFACE_MODE_GMII) 115 return; 116 117 if (gmac->clk_enabled) { 118 clk_disable(gmac->tx_clk); 119 gmac->clk_enabled = 0; 120 } 121 clk_unprepare(gmac->tx_clk); 122 123 if (speed == 1000) { 124 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE); 125 clk_prepare_enable(gmac->tx_clk); 126 gmac->clk_enabled = 1; 127 } else { 128 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE); 129 clk_prepare(gmac->tx_clk); 130 } 131 } 132 133 /* of_data specifying hardware features and callbacks. 134 * hardware features were copied from Allwinner drivers. */ 135 const struct stmmac_of_data sun7i_gmac_data = { 136 .has_gmac = 1, 137 .tx_coe = 1, 138 .fix_mac_speed = sun7i_fix_speed, 139 .setup = sun7i_gmac_setup, 140 .init = sun7i_gmac_init, 141 .exit = sun7i_gmac_exit, 142 }; 143