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 const struct starfive_dwmac_data *data; 31 }; 32 33 static int starfive_dwmac_set_mode(struct plat_stmmacenet_data *plat_dat) 34 { 35 struct starfive_dwmac *dwmac = plat_dat->bsp_priv; 36 struct regmap *regmap; 37 unsigned int args[2]; 38 unsigned int mode; 39 int err; 40 41 switch (plat_dat->mac_interface) { 42 case PHY_INTERFACE_MODE_RMII: 43 mode = STARFIVE_DWMAC_PHY_INFT_RMII; 44 break; 45 46 case PHY_INTERFACE_MODE_RGMII: 47 case PHY_INTERFACE_MODE_RGMII_ID: 48 case PHY_INTERFACE_MODE_RGMII_RXID: 49 case PHY_INTERFACE_MODE_RGMII_TXID: 50 mode = STARFIVE_DWMAC_PHY_INFT_RGMII; 51 break; 52 53 default: 54 dev_err(dwmac->dev, "unsupported interface %d\n", 55 plat_dat->mac_interface); 56 return -EINVAL; 57 } 58 59 regmap = syscon_regmap_lookup_by_phandle_args(dwmac->dev->of_node, 60 "starfive,syscon", 61 2, args); 62 if (IS_ERR(regmap)) 63 return dev_err_probe(dwmac->dev, PTR_ERR(regmap), "getting the regmap failed\n"); 64 65 /* args[0]:offset args[1]: shift */ 66 err = regmap_update_bits(regmap, args[0], 67 STARFIVE_DWMAC_PHY_INFT_FIELD << args[1], 68 mode << args[1]); 69 if (err) 70 return dev_err_probe(dwmac->dev, err, "error setting phy mode\n"); 71 72 if (dwmac->data) { 73 err = regmap_write(regmap, JH7100_SYSMAIN_REGISTER49_DLYCHAIN, 74 dwmac->data->gtxclk_dlychain); 75 if (err) 76 return dev_err_probe(dwmac->dev, err, 77 "error selecting gtxclk delay chain\n"); 78 } 79 80 return 0; 81 } 82 83 static int starfive_dwmac_probe(struct platform_device *pdev) 84 { 85 struct plat_stmmacenet_data *plat_dat; 86 struct stmmac_resources stmmac_res; 87 struct starfive_dwmac *dwmac; 88 struct clk *clk_gtx; 89 int err; 90 91 err = stmmac_get_platform_resources(pdev, &stmmac_res); 92 if (err) 93 return dev_err_probe(&pdev->dev, err, 94 "failed to get resources\n"); 95 96 plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac); 97 if (IS_ERR(plat_dat)) 98 return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat), 99 "dt configuration failed\n"); 100 101 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL); 102 if (!dwmac) 103 return -ENOMEM; 104 105 dwmac->data = device_get_match_data(&pdev->dev); 106 107 plat_dat->clk_tx_i = devm_clk_get_enabled(&pdev->dev, "tx"); 108 if (IS_ERR(plat_dat->clk_tx_i)) 109 return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat->clk_tx_i), 110 "error getting tx clock\n"); 111 112 clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx"); 113 if (IS_ERR(clk_gtx)) 114 return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx), 115 "error getting gtx clock\n"); 116 117 /* Generally, the rgmii_tx clock is provided by the internal clock, 118 * which needs to match the corresponding clock frequency according 119 * to different speeds. If the rgmii_tx clock is provided by the 120 * external rgmii_rxin, there is no need to configure the clock 121 * internally, because rgmii_rxin will be adaptively adjusted. 122 */ 123 if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk")) 124 plat_dat->set_clk_tx_rate = stmmac_set_clk_tx_rate; 125 126 dwmac->dev = &pdev->dev; 127 plat_dat->flags |= STMMAC_FLAG_EN_TX_LPI_CLK_PHY_CAP; 128 plat_dat->bsp_priv = dwmac; 129 plat_dat->dma_cfg->dche = true; 130 131 err = starfive_dwmac_set_mode(plat_dat); 132 if (err) 133 return err; 134 135 return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); 136 } 137 138 static const struct starfive_dwmac_data jh7100_data = { 139 .gtxclk_dlychain = 4, 140 }; 141 142 static const struct of_device_id starfive_dwmac_match[] = { 143 { .compatible = "starfive,jh7100-dwmac", .data = &jh7100_data }, 144 { .compatible = "starfive,jh7110-dwmac" }, 145 { /* sentinel */ } 146 }; 147 MODULE_DEVICE_TABLE(of, starfive_dwmac_match); 148 149 static struct platform_driver starfive_dwmac_driver = { 150 .probe = starfive_dwmac_probe, 151 .remove = stmmac_pltfr_remove, 152 .driver = { 153 .name = "starfive-dwmac", 154 .pm = &stmmac_pltfr_pm_ops, 155 .of_match_table = starfive_dwmac_match, 156 }, 157 }; 158 module_platform_driver(starfive_dwmac_driver); 159 160 MODULE_LICENSE("GPL"); 161 MODULE_DESCRIPTION("StarFive DWMAC platform driver"); 162 MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>"); 163 MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>"); 164