1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * StarFive DWMAC platform driver 4 * 5 * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk> 6 * Copyright (C) 2022 StarFive Technology Co., Ltd. 7 * 8 */ 9 10 #include <linux/mod_devicetable.h> 11 #include <linux/platform_device.h> 12 #include <linux/property.h> 13 #include <linux/mfd/syscon.h> 14 #include <linux/regmap.h> 15 16 #include "stmmac_platform.h" 17 18 #define STARFIVE_DWMAC_PHY_INFT_RGMII 0x1 19 #define STARFIVE_DWMAC_PHY_INFT_RMII 0x4 20 #define STARFIVE_DWMAC_PHY_INFT_FIELD 0x7U 21 22 #define JH7100_SYSMAIN_REGISTER49_DLYCHAIN 0xc8 23 24 struct starfive_dwmac_data { 25 unsigned int gtxclk_dlychain; 26 }; 27 28 struct starfive_dwmac { 29 struct device *dev; 30 struct clk *clk_tx; 31 const struct starfive_dwmac_data *data; 32 }; 33 34 static void starfive_dwmac_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode) 35 { 36 struct starfive_dwmac *dwmac = priv; 37 long rate; 38 int err; 39 40 rate = rgmii_clock(speed); 41 if (rate < 0) { 42 dev_err(dwmac->dev, "invalid speed %u\n", speed); 43 return; 44 } 45 46 err = clk_set_rate(dwmac->clk_tx, rate); 47 if (err) 48 dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate); 49 } 50 51 static int starfive_dwmac_set_mode(struct plat_stmmacenet_data *plat_dat) 52 { 53 struct starfive_dwmac *dwmac = plat_dat->bsp_priv; 54 struct regmap *regmap; 55 unsigned int args[2]; 56 unsigned int mode; 57 int err; 58 59 switch (plat_dat->mac_interface) { 60 case PHY_INTERFACE_MODE_RMII: 61 mode = STARFIVE_DWMAC_PHY_INFT_RMII; 62 break; 63 64 case PHY_INTERFACE_MODE_RGMII: 65 case PHY_INTERFACE_MODE_RGMII_ID: 66 case PHY_INTERFACE_MODE_RGMII_RXID: 67 case PHY_INTERFACE_MODE_RGMII_TXID: 68 mode = STARFIVE_DWMAC_PHY_INFT_RGMII; 69 break; 70 71 default: 72 dev_err(dwmac->dev, "unsupported interface %d\n", 73 plat_dat->mac_interface); 74 return -EINVAL; 75 } 76 77 regmap = syscon_regmap_lookup_by_phandle_args(dwmac->dev->of_node, 78 "starfive,syscon", 79 2, args); 80 if (IS_ERR(regmap)) 81 return dev_err_probe(dwmac->dev, PTR_ERR(regmap), "getting the regmap failed\n"); 82 83 /* args[0]:offset args[1]: shift */ 84 err = regmap_update_bits(regmap, args[0], 85 STARFIVE_DWMAC_PHY_INFT_FIELD << args[1], 86 mode << args[1]); 87 if (err) 88 return dev_err_probe(dwmac->dev, err, "error setting phy mode\n"); 89 90 if (dwmac->data) { 91 err = regmap_write(regmap, JH7100_SYSMAIN_REGISTER49_DLYCHAIN, 92 dwmac->data->gtxclk_dlychain); 93 if (err) 94 return dev_err_probe(dwmac->dev, err, 95 "error selecting gtxclk delay chain\n"); 96 } 97 98 return 0; 99 } 100 101 static int starfive_dwmac_probe(struct platform_device *pdev) 102 { 103 struct plat_stmmacenet_data *plat_dat; 104 struct stmmac_resources stmmac_res; 105 struct starfive_dwmac *dwmac; 106 struct clk *clk_gtx; 107 int err; 108 109 err = stmmac_get_platform_resources(pdev, &stmmac_res); 110 if (err) 111 return dev_err_probe(&pdev->dev, err, 112 "failed to get resources\n"); 113 114 plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac); 115 if (IS_ERR(plat_dat)) 116 return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat), 117 "dt configuration failed\n"); 118 119 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL); 120 if (!dwmac) 121 return -ENOMEM; 122 123 dwmac->data = device_get_match_data(&pdev->dev); 124 125 dwmac->clk_tx = devm_clk_get_enabled(&pdev->dev, "tx"); 126 if (IS_ERR(dwmac->clk_tx)) 127 return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_tx), 128 "error getting tx clock\n"); 129 130 clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx"); 131 if (IS_ERR(clk_gtx)) 132 return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx), 133 "error getting gtx clock\n"); 134 135 /* Generally, the rgmii_tx clock is provided by the internal clock, 136 * which needs to match the corresponding clock frequency according 137 * to different speeds. If the rgmii_tx clock is provided by the 138 * external rgmii_rxin, there is no need to configure the clock 139 * internally, because rgmii_rxin will be adaptively adjusted. 140 */ 141 if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk")) 142 plat_dat->fix_mac_speed = starfive_dwmac_fix_mac_speed; 143 144 dwmac->dev = &pdev->dev; 145 plat_dat->bsp_priv = dwmac; 146 plat_dat->dma_cfg->dche = true; 147 148 err = starfive_dwmac_set_mode(plat_dat); 149 if (err) 150 return err; 151 152 return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); 153 } 154 155 static const struct starfive_dwmac_data jh7100_data = { 156 .gtxclk_dlychain = 4, 157 }; 158 159 static const struct of_device_id starfive_dwmac_match[] = { 160 { .compatible = "starfive,jh7100-dwmac", .data = &jh7100_data }, 161 { .compatible = "starfive,jh7110-dwmac" }, 162 { /* sentinel */ } 163 }; 164 MODULE_DEVICE_TABLE(of, starfive_dwmac_match); 165 166 static struct platform_driver starfive_dwmac_driver = { 167 .probe = starfive_dwmac_probe, 168 .remove = stmmac_pltfr_remove, 169 .driver = { 170 .name = "starfive-dwmac", 171 .pm = &stmmac_pltfr_pm_ops, 172 .of_match_table = starfive_dwmac_match, 173 }, 174 }; 175 module_platform_driver(starfive_dwmac_driver); 176 177 MODULE_LICENSE("GPL"); 178 MODULE_DESCRIPTION("StarFive DWMAC platform driver"); 179 MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>"); 180 MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>"); 181