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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 | // SPDX-License-Identifier: GPL-2.0+ /* * StarFive DWMAC platform driver * * Copyright (C) 2021 Emil Renner Berthing <kernel@esmil.dk> * Copyright (C) 2022 StarFive Technology Co., Ltd. * */ #include <linux/mfd/syscon.h> #include <linux/of_device.h> #include <linux/regmap.h> #include "stmmac_platform.h" #define STARFIVE_DWMAC_PHY_INFT_RGMII 0x1 #define STARFIVE_DWMAC_PHY_INFT_RMII 0x4 #define STARFIVE_DWMAC_PHY_INFT_FIELD 0x7U struct starfive_dwmac { struct device *dev; struct clk *clk_tx; }; static void starfive_dwmac_fix_mac_speed(void *priv, unsigned int speed) { struct starfive_dwmac *dwmac = priv; unsigned long rate; int err; rate = clk_get_rate(dwmac->clk_tx); switch (speed) { case SPEED_1000: rate = 125000000; break; case SPEED_100: rate = 25000000; break; case SPEED_10: rate = 2500000; break; default: dev_err(dwmac->dev, "invalid speed %u\n", speed); break; } err = clk_set_rate(dwmac->clk_tx, rate); if (err) dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate); } static int starfive_dwmac_set_mode(struct plat_stmmacenet_data *plat_dat) { struct starfive_dwmac *dwmac = plat_dat->bsp_priv; struct regmap *regmap; unsigned int args[2]; unsigned int mode; int err; switch (plat_dat->interface) { case PHY_INTERFACE_MODE_RMII: mode = STARFIVE_DWMAC_PHY_INFT_RMII; break; case PHY_INTERFACE_MODE_RGMII: case PHY_INTERFACE_MODE_RGMII_ID: mode = STARFIVE_DWMAC_PHY_INFT_RGMII; break; default: dev_err(dwmac->dev, "unsupported interface %d\n", plat_dat->interface); return -EINVAL; } regmap = syscon_regmap_lookup_by_phandle_args(dwmac->dev->of_node, "starfive,syscon", 2, args); if (IS_ERR(regmap)) return dev_err_probe(dwmac->dev, PTR_ERR(regmap), "getting the regmap failed\n"); /* args[0]:offset args[1]: shift */ err = regmap_update_bits(regmap, args[0], STARFIVE_DWMAC_PHY_INFT_FIELD << args[1], mode << args[1]); if (err) return dev_err_probe(dwmac->dev, err, "error setting phy mode\n"); return 0; } static int starfive_dwmac_probe(struct platform_device *pdev) { struct plat_stmmacenet_data *plat_dat; struct stmmac_resources stmmac_res; struct starfive_dwmac *dwmac; struct clk *clk_gtx; int err; err = stmmac_get_platform_resources(pdev, &stmmac_res); if (err) return dev_err_probe(&pdev->dev, err, "failed to get resources\n"); plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac); if (IS_ERR(plat_dat)) return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat), "dt configuration failed\n"); dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL); if (!dwmac) return -ENOMEM; dwmac->clk_tx = devm_clk_get_enabled(&pdev->dev, "tx"); if (IS_ERR(dwmac->clk_tx)) return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_tx), "error getting tx clock\n"); clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx"); if (IS_ERR(clk_gtx)) return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx), "error getting gtx clock\n"); /* Generally, the rgmii_tx clock is provided by the internal clock, * which needs to match the corresponding clock frequency according * to different speeds. If the rgmii_tx clock is provided by the * external rgmii_rxin, there is no need to configure the clock * internally, because rgmii_rxin will be adaptively adjusted. */ if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk")) plat_dat->fix_mac_speed = starfive_dwmac_fix_mac_speed; dwmac->dev = &pdev->dev; plat_dat->bsp_priv = dwmac; plat_dat->dma_cfg->dche = true; err = starfive_dwmac_set_mode(plat_dat); if (err) return err; err = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); if (err) { stmmac_remove_config_dt(pdev, plat_dat); return err; } return 0; } static const struct of_device_id starfive_dwmac_match[] = { { .compatible = "starfive,jh7110-dwmac" }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, starfive_dwmac_match); static struct platform_driver starfive_dwmac_driver = { .probe = starfive_dwmac_probe, .remove = stmmac_pltfr_remove, .driver = { .name = "starfive-dwmac", .pm = &stmmac_pltfr_pm_ops, .of_match_table = starfive_dwmac_match, }, }; module_platform_driver(starfive_dwmac_driver); MODULE_LICENSE("GPL"); MODULE_DESCRIPTION("StarFive DWMAC platform driver"); MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>"); MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>"); |