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1// SPDX-License-Identifier: GPL-2.02/* Intel DWMAC platform driver3 *4 * Copyright(C) 2020 Intel Corporation5 */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 18struct intel_dwmac {19 struct device *dev;20 struct clk *tx_clk;21 const struct intel_dwmac_data *data;22};23 24struct 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 31static void kmb_eth_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode)32{33 struct intel_dwmac *dwmac = priv;34 unsigned long rate;35 int ret;36 37 rate = clk_get_rate(dwmac->tx_clk);38 39 switch (speed) {40 case SPEED_1000:41 rate = 125000000;42 break;43 44 case SPEED_100:45 rate = 25000000;46 break;47 48 case SPEED_10:49 rate = 2500000;50 break;51 52 default:53 dev_err(dwmac->dev, "Invalid speed\n");54 break;55 }56 57 ret = clk_set_rate(dwmac->tx_clk, rate);58 if (ret)59 dev_err(dwmac->dev, "Failed to configure tx clock rate\n");60}61 62static const struct intel_dwmac_data kmb_data = {63 .fix_mac_speed = kmb_eth_fix_mac_speed,64 .ptp_ref_clk_rate = 200000000,65 .tx_clk_rate = 125000000,66 .tx_clk_en = true,67};68 69static const struct of_device_id intel_eth_plat_match[] = {70 { .compatible = "intel,keembay-dwmac", .data = &kmb_data },71 { }72};73MODULE_DEVICE_TABLE(of, intel_eth_plat_match);74 75static int intel_eth_plat_probe(struct platform_device *pdev)76{77 struct plat_stmmacenet_data *plat_dat;78 struct stmmac_resources stmmac_res;79 struct intel_dwmac *dwmac;80 unsigned long rate;81 int ret;82 83 ret = stmmac_get_platform_resources(pdev, &stmmac_res);84 if (ret)85 return ret;86 87 plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);88 if (IS_ERR(plat_dat)) {89 dev_err(&pdev->dev, "dt configuration failed\n");90 return PTR_ERR(plat_dat);91 }92 93 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);94 if (!dwmac)95 return -ENOMEM;96 97 dwmac->dev = &pdev->dev;98 dwmac->tx_clk = NULL;99 100 dwmac->data = device_get_match_data(&pdev->dev);101 if (dwmac->data) {102 if (dwmac->data->fix_mac_speed)103 plat_dat->fix_mac_speed = dwmac->data->fix_mac_speed;104 105 /* Enable TX clock */106 if (dwmac->data->tx_clk_en) {107 dwmac->tx_clk = devm_clk_get(&pdev->dev, "tx_clk");108 if (IS_ERR(dwmac->tx_clk))109 return PTR_ERR(dwmac->tx_clk);110 111 ret = clk_prepare_enable(dwmac->tx_clk);112 if (ret) {113 dev_err(&pdev->dev,114 "Failed to enable tx_clk\n");115 return ret;116 }117 118 /* Check and configure TX clock rate */119 rate = clk_get_rate(dwmac->tx_clk);120 if (dwmac->data->tx_clk_rate &&121 rate != dwmac->data->tx_clk_rate) {122 rate = dwmac->data->tx_clk_rate;123 ret = clk_set_rate(dwmac->tx_clk, rate);124 if (ret) {125 dev_err(&pdev->dev,126 "Failed to set tx_clk\n");127 goto err_tx_clk_disable;128 }129 }130 }131 132 /* Check and configure PTP ref clock rate */133 rate = clk_get_rate(plat_dat->clk_ptp_ref);134 if (dwmac->data->ptp_ref_clk_rate &&135 rate != dwmac->data->ptp_ref_clk_rate) {136 rate = dwmac->data->ptp_ref_clk_rate;137 ret = clk_set_rate(plat_dat->clk_ptp_ref, rate);138 if (ret) {139 dev_err(&pdev->dev,140 "Failed to set clk_ptp_ref\n");141 goto err_tx_clk_disable;142 }143 }144 }145 146 plat_dat->bsp_priv = dwmac;147 plat_dat->eee_usecs_rate = plat_dat->clk_ptp_rate;148 149 if (plat_dat->eee_usecs_rate > 0) {150 u32 tx_lpi_usec;151 152 tx_lpi_usec = (plat_dat->eee_usecs_rate / 1000000) - 1;153 writel(tx_lpi_usec, stmmac_res.addr + GMAC_1US_TIC_COUNTER);154 }155 156 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);157 if (ret)158 goto err_tx_clk_disable;159 160 return 0;161 162err_tx_clk_disable:163 if (dwmac->data->tx_clk_en)164 clk_disable_unprepare(dwmac->tx_clk);165 return ret;166}167 168static void intel_eth_plat_remove(struct platform_device *pdev)169{170 struct intel_dwmac *dwmac = get_stmmac_bsp_priv(&pdev->dev);171 172 stmmac_pltfr_remove(pdev);173 if (dwmac->data->tx_clk_en)174 clk_disable_unprepare(dwmac->tx_clk);175}176 177static struct platform_driver intel_eth_plat_driver = {178 .probe = intel_eth_plat_probe,179 .remove_new = intel_eth_plat_remove,180 .driver = {181 .name = "intel-eth-plat",182 .pm = &stmmac_pltfr_pm_ops,183 .of_match_table = intel_eth_plat_match,184 },185};186module_platform_driver(intel_eth_plat_driver);187 188MODULE_LICENSE("GPL v2");189MODULE_DESCRIPTION("Intel DWMAC platform driver");190