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/platform_device.h> 11 #include <linux/property.h> 12 #include <linux/stmmac.h> 13 14 #include "dwmac4.h" 15 #include "stmmac.h" 16 #include "stmmac_platform.h" 17 18 struct intel_dwmac { 19 struct device *dev; 20 struct clk *tx_clk; 21 const struct intel_dwmac_data *data; 22 }; 23 24 struct intel_dwmac_data { 25 void (*fix_mac_speed)(void *priv, unsigned int speed, unsigned int mode); 26 unsigned long ptp_ref_clk_rate; 27 unsigned long tx_clk_rate; 28 bool tx_clk_en; 29 }; 30 31 static void kmb_eth_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode) 32 { 33 struct intel_dwmac *dwmac = priv; 34 unsigned long rate; 35 int ret; 36 37 rate = clk_get_rate(dwmac->tx_clk); 38 39 switch (speed) { 40 case SPEED_1000: 41 rate = 125000000; 42 break; 43 44 case SPEED_100: 45 rate = 25000000; 46 break; 47 48 case SPEED_10: 49 rate = 2500000; 50 break; 51 52 default: 53 dev_err(dwmac->dev, "Invalid speed\n"); 54 break; 55 } 56 57 ret = clk_set_rate(dwmac->tx_clk, rate); 58 if (ret) 59 dev_err(dwmac->dev, "Failed to configure tx clock rate\n"); 60 } 61 62 static const struct intel_dwmac_data kmb_data = { 63 .fix_mac_speed = kmb_eth_fix_mac_speed, 64 .ptp_ref_clk_rate = 200000000, 65 .tx_clk_rate = 125000000, 66 .tx_clk_en = true, 67 }; 68 69 static const struct of_device_id intel_eth_plat_match[] = { 70 { .compatible = "intel,keembay-dwmac", .data = &kmb_data }, 71 { } 72 }; 73 MODULE_DEVICE_TABLE(of, intel_eth_plat_match); 74 75 static int intel_eth_plat_probe(struct platform_device *pdev) 76 { 77 struct plat_stmmacenet_data *plat_dat; 78 struct stmmac_resources stmmac_res; 79 struct intel_dwmac *dwmac; 80 unsigned long rate; 81 int ret; 82 83 ret = stmmac_get_platform_resources(pdev, &stmmac_res); 84 if (ret) 85 return ret; 86 87 plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac); 88 if (IS_ERR(plat_dat)) { 89 dev_err(&pdev->dev, "dt configuration failed\n"); 90 return PTR_ERR(plat_dat); 91 } 92 93 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL); 94 if (!dwmac) 95 return -ENOMEM; 96 97 dwmac->dev = &pdev->dev; 98 dwmac->tx_clk = NULL; 99 100 /* 101 * This cannot return NULL at this point because the driver’s 102 * compatibility with the device has already been validated in 103 * platform_match(). 104 */ 105 dwmac->data = device_get_match_data(&pdev->dev); 106 if (dwmac->data->fix_mac_speed) 107 plat_dat->fix_mac_speed = dwmac->data->fix_mac_speed; 108 109 /* Enable TX clock */ 110 if (dwmac->data->tx_clk_en) { 111 dwmac->tx_clk = devm_clk_get(&pdev->dev, "tx_clk"); 112 if (IS_ERR(dwmac->tx_clk)) 113 return PTR_ERR(dwmac->tx_clk); 114 115 ret = clk_prepare_enable(dwmac->tx_clk); 116 if (ret) { 117 dev_err(&pdev->dev, 118 "Failed to enable tx_clk\n"); 119 return ret; 120 } 121 122 /* Check and configure TX clock rate */ 123 rate = clk_get_rate(dwmac->tx_clk); 124 if (dwmac->data->tx_clk_rate && 125 rate != dwmac->data->tx_clk_rate) { 126 rate = dwmac->data->tx_clk_rate; 127 ret = clk_set_rate(dwmac->tx_clk, rate); 128 if (ret) { 129 dev_err(&pdev->dev, 130 "Failed to set tx_clk\n"); 131 goto err_tx_clk_disable; 132 } 133 } 134 135 /* Check and configure PTP ref clock rate */ 136 rate = clk_get_rate(plat_dat->clk_ptp_ref); 137 if (dwmac->data->ptp_ref_clk_rate && 138 rate != dwmac->data->ptp_ref_clk_rate) { 139 rate = dwmac->data->ptp_ref_clk_rate; 140 ret = clk_set_rate(plat_dat->clk_ptp_ref, rate); 141 if (ret) { 142 dev_err(&pdev->dev, 143 "Failed to set clk_ptp_ref\n"); 144 goto err_tx_clk_disable; 145 } 146 } 147 } 148 149 plat_dat->bsp_priv = dwmac; 150 plat_dat->eee_usecs_rate = plat_dat->clk_ptp_rate; 151 152 if (plat_dat->eee_usecs_rate > 0) { 153 u32 tx_lpi_usec; 154 155 tx_lpi_usec = (plat_dat->eee_usecs_rate / 1000000) - 1; 156 writel(tx_lpi_usec, stmmac_res.addr + GMAC_1US_TIC_COUNTER); 157 } 158 159 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); 160 if (ret) 161 goto err_tx_clk_disable; 162 163 return 0; 164 165 err_tx_clk_disable: 166 if (dwmac->data->tx_clk_en) 167 clk_disable_unprepare(dwmac->tx_clk); 168 return ret; 169 } 170 171 static void intel_eth_plat_remove(struct platform_device *pdev) 172 { 173 struct intel_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev); 174 175 stmmac_pltfr_remove(pdev); 176 if (dwmac->data->tx_clk_en) 177 clk_disable_unprepare(dwmac->tx_clk); 178 } 179 180 static struct platform_driver intel_eth_plat_driver = { 181 .probe = intel_eth_plat_probe, 182 .remove = intel_eth_plat_remove, 183 .driver = { 184 .name = "intel-eth-plat", 185 .pm = &stmmac_pltfr_pm_ops, 186 .of_match_table = intel_eth_plat_match, 187 }, 188 }; 189 module_platform_driver(intel_eth_plat_driver); 190 191 MODULE_LICENSE("GPL v2"); 192 MODULE_DESCRIPTION("Intel DWMAC platform driver"); 193