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1// SPDX-License-Identifier: GPL-2.0+2/*3 * StarFive DWMAC platform driver4 *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 0x119#define STARFIVE_DWMAC_PHY_INFT_RMII 0x420#define STARFIVE_DWMAC_PHY_INFT_FIELD 0x7U21 22#define JH7100_SYSMAIN_REGISTER49_DLYCHAIN 0xc823 24struct starfive_dwmac_data {25 unsigned int gtxclk_dlychain;26};27 28struct starfive_dwmac {29 struct device *dev;30 struct clk *clk_tx;31 const struct starfive_dwmac_data *data;32};33 34static void starfive_dwmac_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)35{36 struct starfive_dwmac *dwmac = priv;37 unsigned long rate;38 int err;39 40 rate = clk_get_rate(dwmac->clk_tx);41 42 switch (speed) {43 case SPEED_1000:44 rate = 125000000;45 break;46 case SPEED_100:47 rate = 25000000;48 break;49 case SPEED_10:50 rate = 2500000;51 break;52 default:53 dev_err(dwmac->dev, "invalid speed %u\n", speed);54 break;55 }56 57 err = clk_set_rate(dwmac->clk_tx, rate);58 if (err)59 dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);60}61 62static int starfive_dwmac_set_mode(struct plat_stmmacenet_data *plat_dat)63{64 struct starfive_dwmac *dwmac = plat_dat->bsp_priv;65 struct regmap *regmap;66 unsigned int args[2];67 unsigned int mode;68 int err;69 70 switch (plat_dat->mac_interface) {71 case PHY_INTERFACE_MODE_RMII:72 mode = STARFIVE_DWMAC_PHY_INFT_RMII;73 break;74 75 case PHY_INTERFACE_MODE_RGMII:76 case PHY_INTERFACE_MODE_RGMII_ID:77 case PHY_INTERFACE_MODE_RGMII_RXID:78 case PHY_INTERFACE_MODE_RGMII_TXID:79 mode = STARFIVE_DWMAC_PHY_INFT_RGMII;80 break;81 82 default:83 dev_err(dwmac->dev, "unsupported interface %d\n",84 plat_dat->mac_interface);85 return -EINVAL;86 }87 88 regmap = syscon_regmap_lookup_by_phandle_args(dwmac->dev->of_node,89 "starfive,syscon",90 2, args);91 if (IS_ERR(regmap))92 return dev_err_probe(dwmac->dev, PTR_ERR(regmap), "getting the regmap failed\n");93 94 /* args[0]:offset args[1]: shift */95 err = regmap_update_bits(regmap, args[0],96 STARFIVE_DWMAC_PHY_INFT_FIELD << args[1],97 mode << args[1]);98 if (err)99 return dev_err_probe(dwmac->dev, err, "error setting phy mode\n");100 101 if (dwmac->data) {102 err = regmap_write(regmap, JH7100_SYSMAIN_REGISTER49_DLYCHAIN,103 dwmac->data->gtxclk_dlychain);104 if (err)105 return dev_err_probe(dwmac->dev, err,106 "error selecting gtxclk delay chain\n");107 }108 109 return 0;110}111 112static int starfive_dwmac_probe(struct platform_device *pdev)113{114 struct plat_stmmacenet_data *plat_dat;115 struct stmmac_resources stmmac_res;116 struct starfive_dwmac *dwmac;117 struct clk *clk_gtx;118 int err;119 120 err = stmmac_get_platform_resources(pdev, &stmmac_res);121 if (err)122 return dev_err_probe(&pdev->dev, err,123 "failed to get resources\n");124 125 plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);126 if (IS_ERR(plat_dat))127 return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat),128 "dt configuration failed\n");129 130 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);131 if (!dwmac)132 return -ENOMEM;133 134 dwmac->data = device_get_match_data(&pdev->dev);135 136 dwmac->clk_tx = devm_clk_get_enabled(&pdev->dev, "tx");137 if (IS_ERR(dwmac->clk_tx))138 return dev_err_probe(&pdev->dev, PTR_ERR(dwmac->clk_tx),139 "error getting tx clock\n");140 141 clk_gtx = devm_clk_get_enabled(&pdev->dev, "gtx");142 if (IS_ERR(clk_gtx))143 return dev_err_probe(&pdev->dev, PTR_ERR(clk_gtx),144 "error getting gtx clock\n");145 146 /* Generally, the rgmii_tx clock is provided by the internal clock,147 * which needs to match the corresponding clock frequency according148 * to different speeds. If the rgmii_tx clock is provided by the149 * external rgmii_rxin, there is no need to configure the clock150 * internally, because rgmii_rxin will be adaptively adjusted.151 */152 if (!device_property_read_bool(&pdev->dev, "starfive,tx-use-rgmii-clk"))153 plat_dat->fix_mac_speed = starfive_dwmac_fix_mac_speed;154 155 dwmac->dev = &pdev->dev;156 plat_dat->bsp_priv = dwmac;157 plat_dat->dma_cfg->dche = true;158 159 err = starfive_dwmac_set_mode(plat_dat);160 if (err)161 return err;162 163 return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);164}165 166static const struct starfive_dwmac_data jh7100_data = {167 .gtxclk_dlychain = 4,168};169 170static const struct of_device_id starfive_dwmac_match[] = {171 { .compatible = "starfive,jh7100-dwmac", .data = &jh7100_data },172 { .compatible = "starfive,jh7110-dwmac" },173 { /* sentinel */ }174};175MODULE_DEVICE_TABLE(of, starfive_dwmac_match);176 177static struct platform_driver starfive_dwmac_driver = {178 .probe = starfive_dwmac_probe,179 .remove_new = stmmac_pltfr_remove,180 .driver = {181 .name = "starfive-dwmac",182 .pm = &stmmac_pltfr_pm_ops,183 .of_match_table = starfive_dwmac_match,184 },185};186module_platform_driver(starfive_dwmac_driver);187 188MODULE_LICENSE("GPL");189MODULE_DESCRIPTION("StarFive DWMAC platform driver");190MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>");191MODULE_AUTHOR("Samin Guo <samin.guo@starfivetech.com>");192