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 clk_prepare(gmac->tx_clk); 63 } 64 65 return 0; 66 } 67 68 static void sun7i_gmac_exit(struct platform_device *pdev, void *priv) 69 { 70 struct sunxi_priv_data *gmac = priv; 71 72 if (gmac->clk_enabled) { 73 clk_disable(gmac->tx_clk); 74 gmac->clk_enabled = 0; 75 } 76 clk_unprepare(gmac->tx_clk); 77 78 if (gmac->regulator) 79 regulator_disable(gmac->regulator); 80 } 81 82 static void sun7i_fix_speed(void *priv, unsigned int speed) 83 { 84 struct sunxi_priv_data *gmac = priv; 85 86 /* only GMII mode requires us to reconfigure the clock lines */ 87 if (gmac->interface != PHY_INTERFACE_MODE_GMII) 88 return; 89 90 if (gmac->clk_enabled) { 91 clk_disable(gmac->tx_clk); 92 gmac->clk_enabled = 0; 93 } 94 clk_unprepare(gmac->tx_clk); 95 96 if (speed == 1000) { 97 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE); 98 clk_prepare_enable(gmac->tx_clk); 99 gmac->clk_enabled = 1; 100 } else { 101 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE); 102 clk_prepare(gmac->tx_clk); 103 } 104 } 105 106 static int sun7i_gmac_probe(struct platform_device *pdev) 107 { 108 struct plat_stmmacenet_data *plat_dat; 109 struct stmmac_resources stmmac_res; 110 struct sunxi_priv_data *gmac; 111 struct device *dev = &pdev->dev; 112 int ret; 113 114 ret = stmmac_get_platform_resources(pdev, &stmmac_res); 115 if (ret) 116 return ret; 117 118 plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac); 119 if (IS_ERR(plat_dat)) 120 return PTR_ERR(plat_dat); 121 122 gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL); 123 if (!gmac) 124 return -ENOMEM; 125 126 gmac->interface = of_get_phy_mode(dev->of_node); 127 128 gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx"); 129 if (IS_ERR(gmac->tx_clk)) { 130 dev_err(dev, "could not get tx clock\n"); 131 return PTR_ERR(gmac->tx_clk); 132 } 133 134 /* Optional regulator for PHY */ 135 gmac->regulator = devm_regulator_get_optional(dev, "phy"); 136 if (IS_ERR(gmac->regulator)) { 137 if (PTR_ERR(gmac->regulator) == -EPROBE_DEFER) 138 return -EPROBE_DEFER; 139 dev_info(dev, "no regulator found\n"); 140 gmac->regulator = NULL; 141 } 142 143 /* platform data specifying hardware features and callbacks. 144 * hardware features were copied from Allwinner drivers. */ 145 plat_dat->tx_coe = 1; 146 plat_dat->has_gmac = true; 147 plat_dat->bsp_priv = gmac; 148 plat_dat->init = sun7i_gmac_init; 149 plat_dat->exit = sun7i_gmac_exit; 150 plat_dat->fix_mac_speed = sun7i_fix_speed; 151 152 ret = sun7i_gmac_init(pdev, plat_dat->bsp_priv); 153 if (ret) 154 return ret; 155 156 return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); 157 } 158 159 static const struct of_device_id sun7i_dwmac_match[] = { 160 { .compatible = "allwinner,sun7i-a20-gmac" }, 161 { } 162 }; 163 MODULE_DEVICE_TABLE(of, sun7i_dwmac_match); 164 165 static struct platform_driver sun7i_dwmac_driver = { 166 .probe = sun7i_gmac_probe, 167 .remove = stmmac_pltfr_remove, 168 .driver = { 169 .name = "sun7i-dwmac", 170 .pm = &stmmac_pltfr_pm_ops, 171 .of_match_table = sun7i_dwmac_match, 172 }, 173 }; 174 module_platform_driver(sun7i_dwmac_driver); 175 176 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>"); 177 MODULE_DESCRIPTION("Allwinner sunxi DWMAC specific glue layer"); 178 MODULE_LICENSE("GPL"); 179