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