1 // SPDX-License-Identifier: GPL-2.0 2 /* Intel DWMAC platform driver 3 * 4 * Copyright(C) 2020 Intel Corporation 5 */ 6 7 #include <linux/ethtool.h> 8 #include <linux/module.h> 9 #include <linux/of.h> 10 #include <linux/of_device.h> 11 #include <linux/platform_device.h> 12 #include <linux/stmmac.h> 13 14 #include "stmmac.h" 15 #include "stmmac_platform.h" 16 17 struct intel_dwmac { 18 struct device *dev; 19 struct clk *tx_clk; 20 const struct intel_dwmac_data *data; 21 }; 22 23 struct intel_dwmac_data { 24 void (*fix_mac_speed)(void *priv, unsigned int speed); 25 unsigned long ptp_ref_clk_rate; 26 unsigned long tx_clk_rate; 27 bool tx_clk_en; 28 }; 29 30 static void kmb_eth_fix_mac_speed(void *priv, unsigned int speed) 31 { 32 struct intel_dwmac *dwmac = priv; 33 unsigned long rate; 34 int ret; 35 36 rate = clk_get_rate(dwmac->tx_clk); 37 38 switch (speed) { 39 case SPEED_1000: 40 rate = 125000000; 41 break; 42 43 case SPEED_100: 44 rate = 25000000; 45 break; 46 47 case SPEED_10: 48 rate = 2500000; 49 break; 50 51 default: 52 dev_err(dwmac->dev, "Invalid speed\n"); 53 break; 54 } 55 56 ret = clk_set_rate(dwmac->tx_clk, rate); 57 if (ret) 58 dev_err(dwmac->dev, "Failed to configure tx clock rate\n"); 59 } 60 61 static const struct intel_dwmac_data kmb_data = { 62 .fix_mac_speed = kmb_eth_fix_mac_speed, 63 .ptp_ref_clk_rate = 200000000, 64 .tx_clk_rate = 125000000, 65 .tx_clk_en = true, 66 }; 67 68 static const struct of_device_id intel_eth_plat_match[] = { 69 { .compatible = "intel,keembay-dwmac", .data = &kmb_data }, 70 { } 71 }; 72 MODULE_DEVICE_TABLE(of, intel_eth_plat_match); 73 74 static int intel_eth_plat_probe(struct platform_device *pdev) 75 { 76 struct net_device *ndev = platform_get_drvdata(pdev); 77 struct stmmac_priv *priv = netdev_priv(ndev); 78 struct plat_stmmacenet_data *plat_dat; 79 struct stmmac_resources stmmac_res; 80 const struct of_device_id *match; 81 struct intel_dwmac *dwmac; 82 unsigned long rate; 83 int ret; 84 85 plat_dat = priv->plat; 86 ret = stmmac_get_platform_resources(pdev, &stmmac_res); 87 if (ret) 88 return ret; 89 90 plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac); 91 if (IS_ERR(plat_dat)) { 92 dev_err(&pdev->dev, "dt configuration failed\n"); 93 return PTR_ERR(plat_dat); 94 } 95 96 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL); 97 if (!dwmac) { 98 ret = -ENOMEM; 99 goto err_remove_config_dt; 100 } 101 102 dwmac->dev = &pdev->dev; 103 dwmac->tx_clk = NULL; 104 105 match = of_match_device(intel_eth_plat_match, &pdev->dev); 106 if (match && match->data) { 107 dwmac->data = (const struct intel_dwmac_data *)match->data; 108 109 if (dwmac->data->fix_mac_speed) 110 plat_dat->fix_mac_speed = dwmac->data->fix_mac_speed; 111 112 /* Enable TX clock */ 113 if (dwmac->data->tx_clk_en) { 114 dwmac->tx_clk = devm_clk_get(&pdev->dev, "tx_clk"); 115 if (IS_ERR(dwmac->tx_clk)) 116 goto err_remove_config_dt; 117 118 clk_prepare_enable(dwmac->tx_clk); 119 120 /* Check and configure TX clock rate */ 121 rate = clk_get_rate(dwmac->tx_clk); 122 if (dwmac->data->tx_clk_rate && 123 rate != dwmac->data->tx_clk_rate) { 124 rate = dwmac->data->tx_clk_rate; 125 ret = clk_set_rate(dwmac->tx_clk, rate); 126 if (ret) { 127 dev_err(&pdev->dev, 128 "Failed to set tx_clk\n"); 129 return ret; 130 } 131 } 132 } 133 134 /* Check and configure PTP ref clock rate */ 135 rate = clk_get_rate(plat_dat->clk_ptp_ref); 136 if (dwmac->data->ptp_ref_clk_rate && 137 rate != dwmac->data->ptp_ref_clk_rate) { 138 rate = dwmac->data->ptp_ref_clk_rate; 139 ret = clk_set_rate(plat_dat->clk_ptp_ref, rate); 140 if (ret) { 141 dev_err(&pdev->dev, 142 "Failed to set clk_ptp_ref\n"); 143 return ret; 144 } 145 } 146 } 147 148 plat_dat->bsp_priv = dwmac; 149 150 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); 151 if (ret) { 152 if (dwmac->tx_clk) 153 clk_disable_unprepare(dwmac->tx_clk); 154 155 goto err_remove_config_dt; 156 } 157 158 return 0; 159 160 err_remove_config_dt: 161 stmmac_remove_config_dt(pdev, plat_dat); 162 163 return ret; 164 } 165 166 static int intel_eth_plat_remove(struct platform_device *pdev) 167 { 168 struct intel_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev); 169 int ret; 170 171 ret = stmmac_pltfr_remove(pdev); 172 173 if (dwmac->tx_clk) 174 clk_disable_unprepare(dwmac->tx_clk); 175 176 return ret; 177 } 178 179 static struct platform_driver intel_eth_plat_driver = { 180 .probe = intel_eth_plat_probe, 181 .remove = intel_eth_plat_remove, 182 .driver = { 183 .name = "intel-eth-plat", 184 .pm = &stmmac_pltfr_pm_ops, 185 .of_match_table = intel_eth_plat_match, 186 }, 187 }; 188 module_platform_driver(intel_eth_plat_driver); 189 190 MODULE_LICENSE("GPL v2"); 191 MODULE_DESCRIPTION("Intel DWMAC platform driver"); 192