1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * dwmac-sunxi.c - Allwinner sunxi DWMAC specific glue layer 4 * 5 * Copyright (C) 2013 Chen-Yu Tsai 6 * 7 * Chen-Yu Tsai <wens@csie.org> 8 */ 9 10 #include <linux/stmmac.h> 11 #include <linux/clk.h> 12 #include <linux/module.h> 13 #include <linux/phy.h> 14 #include <linux/platform_device.h> 15 #include <linux/of_net.h> 16 #include <linux/regulator/consumer.h> 17 18 #include "stmmac_platform.h" 19 20 struct sunxi_priv_data { 21 phy_interface_t interface; 22 int clk_enabled; 23 struct clk *tx_clk; 24 struct regulator *regulator; 25 }; 26 27 #define SUN7I_GMAC_GMII_RGMII_RATE 125000000 28 #define SUN7I_GMAC_MII_RATE 25000000 29 30 static int sun7i_gmac_init(struct platform_device *pdev, void *priv) 31 { 32 struct sunxi_priv_data *gmac = priv; 33 int ret = 0; 34 35 if (gmac->regulator) { 36 ret = regulator_enable(gmac->regulator); 37 if (ret) 38 return ret; 39 } 40 41 /* Set GMAC interface port mode 42 * 43 * The GMAC TX clock lines are configured by setting the clock 44 * rate, which then uses the auto-reparenting feature of the 45 * clock driver, and enabling/disabling the clock. 46 */ 47 if (phy_interface_mode_is_rgmii(gmac->interface)) { 48 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE); 49 clk_prepare_enable(gmac->tx_clk); 50 gmac->clk_enabled = 1; 51 } else { 52 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE); 53 ret = clk_prepare(gmac->tx_clk); 54 if (ret && gmac->regulator) 55 regulator_disable(gmac->regulator); 56 } 57 58 return ret; 59 } 60 61 static void sun7i_gmac_exit(struct platform_device *pdev, void *priv) 62 { 63 struct sunxi_priv_data *gmac = priv; 64 65 if (gmac->clk_enabled) { 66 clk_disable(gmac->tx_clk); 67 gmac->clk_enabled = 0; 68 } 69 clk_unprepare(gmac->tx_clk); 70 71 if (gmac->regulator) 72 regulator_disable(gmac->regulator); 73 } 74 75 static void sun7i_fix_speed(void *priv, unsigned int speed) 76 { 77 struct sunxi_priv_data *gmac = priv; 78 79 /* only GMII mode requires us to reconfigure the clock lines */ 80 if (gmac->interface != PHY_INTERFACE_MODE_GMII) 81 return; 82 83 if (gmac->clk_enabled) { 84 clk_disable(gmac->tx_clk); 85 gmac->clk_enabled = 0; 86 } 87 clk_unprepare(gmac->tx_clk); 88 89 if (speed == 1000) { 90 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_GMII_RGMII_RATE); 91 clk_prepare_enable(gmac->tx_clk); 92 gmac->clk_enabled = 1; 93 } else { 94 clk_set_rate(gmac->tx_clk, SUN7I_GMAC_MII_RATE); 95 clk_prepare(gmac->tx_clk); 96 } 97 } 98 99 static int sun7i_gmac_probe(struct platform_device *pdev) 100 { 101 struct plat_stmmacenet_data *plat_dat; 102 struct stmmac_resources stmmac_res; 103 struct sunxi_priv_data *gmac; 104 struct device *dev = &pdev->dev; 105 int ret; 106 107 ret = stmmac_get_platform_resources(pdev, &stmmac_res); 108 if (ret) 109 return ret; 110 111 plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac); 112 if (IS_ERR(plat_dat)) 113 return PTR_ERR(plat_dat); 114 115 gmac = devm_kzalloc(dev, sizeof(*gmac), GFP_KERNEL); 116 if (!gmac) { 117 ret = -ENOMEM; 118 goto err_remove_config_dt; 119 } 120 121 ret = of_get_phy_mode(dev->of_node, &gmac->interface); 122 if (ret && ret != -ENODEV) { 123 dev_err(dev, "Can't get phy-mode\n"); 124 goto err_remove_config_dt; 125 } 126 127 gmac->tx_clk = devm_clk_get(dev, "allwinner_gmac_tx"); 128 if (IS_ERR(gmac->tx_clk)) { 129 dev_err(dev, "could not get tx clock\n"); 130 ret = PTR_ERR(gmac->tx_clk); 131 goto err_remove_config_dt; 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 ret = -EPROBE_DEFER; 139 goto err_remove_config_dt; 140 } 141 dev_info(dev, "no regulator found\n"); 142 gmac->regulator = NULL; 143 } 144 145 /* platform data specifying hardware features and callbacks. 146 * hardware features were copied from Allwinner drivers. */ 147 plat_dat->tx_coe = 1; 148 plat_dat->has_gmac = true; 149 plat_dat->bsp_priv = gmac; 150 plat_dat->init = sun7i_gmac_init; 151 plat_dat->exit = sun7i_gmac_exit; 152 plat_dat->fix_mac_speed = sun7i_fix_speed; 153 plat_dat->tx_fifo_size = 4096; 154 plat_dat->rx_fifo_size = 16384; 155 156 ret = sun7i_gmac_init(pdev, plat_dat->bsp_priv); 157 if (ret) 158 goto err_remove_config_dt; 159 160 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); 161 if (ret) 162 goto err_gmac_exit; 163 164 return 0; 165 166 err_gmac_exit: 167 sun7i_gmac_exit(pdev, plat_dat->bsp_priv); 168 err_remove_config_dt: 169 stmmac_remove_config_dt(pdev, plat_dat); 170 171 return ret; 172 } 173 174 static const struct of_device_id sun7i_dwmac_match[] = { 175 { .compatible = "allwinner,sun7i-a20-gmac" }, 176 { } 177 }; 178 MODULE_DEVICE_TABLE(of, sun7i_dwmac_match); 179 180 static struct platform_driver sun7i_dwmac_driver = { 181 .probe = sun7i_gmac_probe, 182 .remove = stmmac_pltfr_remove, 183 .driver = { 184 .name = "sun7i-dwmac", 185 .pm = &stmmac_pltfr_pm_ops, 186 .of_match_table = sun7i_dwmac_match, 187 }, 188 }; 189 module_platform_driver(sun7i_dwmac_driver); 190 191 MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>"); 192 MODULE_DESCRIPTION("Allwinner sunxi DWMAC specific glue layer"); 193 MODULE_LICENSE("GPL"); 194