1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Amlogic Meson6 and Meson8 DWMAC glue layer 4 * 5 * Copyright (C) 2014 Beniamino Galvani <b.galvani@gmail.com> 6 */ 7 8 #include <linux/device.h> 9 #include <linux/ethtool.h> 10 #include <linux/io.h> 11 #include <linux/ioport.h> 12 #include <linux/module.h> 13 #include <linux/platform_device.h> 14 #include <linux/stmmac.h> 15 16 #include "stmmac_platform.h" 17 18 #define ETHMAC_SPEED_100 BIT(1) 19 20 struct meson_dwmac { 21 struct device *dev; 22 void __iomem *reg; 23 }; 24 25 static void meson6_dwmac_fix_mac_speed(void *priv, unsigned int speed, unsigned int mode) 26 { 27 struct meson_dwmac *dwmac = priv; 28 unsigned int val; 29 30 val = readl(dwmac->reg); 31 32 switch (speed) { 33 case SPEED_10: 34 val &= ~ETHMAC_SPEED_100; 35 break; 36 case SPEED_100: 37 val |= ETHMAC_SPEED_100; 38 break; 39 } 40 41 writel(val, dwmac->reg); 42 } 43 44 static int meson6_dwmac_probe(struct platform_device *pdev) 45 { 46 struct plat_stmmacenet_data *plat_dat; 47 struct stmmac_resources stmmac_res; 48 struct meson_dwmac *dwmac; 49 int ret; 50 51 ret = stmmac_get_platform_resources(pdev, &stmmac_res); 52 if (ret) 53 return ret; 54 55 plat_dat = stmmac_probe_config_dt(pdev, stmmac_res.mac); 56 if (IS_ERR(plat_dat)) 57 return PTR_ERR(plat_dat); 58 59 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL); 60 if (!dwmac) { 61 ret = -ENOMEM; 62 goto err_remove_config_dt; 63 } 64 65 dwmac->reg = devm_platform_ioremap_resource(pdev, 1); 66 if (IS_ERR(dwmac->reg)) { 67 ret = PTR_ERR(dwmac->reg); 68 goto err_remove_config_dt; 69 } 70 71 plat_dat->bsp_priv = dwmac; 72 plat_dat->fix_mac_speed = meson6_dwmac_fix_mac_speed; 73 74 ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); 75 if (ret) 76 goto err_remove_config_dt; 77 78 return 0; 79 80 err_remove_config_dt: 81 stmmac_remove_config_dt(pdev, plat_dat); 82 83 return ret; 84 } 85 86 static const struct of_device_id meson6_dwmac_match[] = { 87 { .compatible = "amlogic,meson6-dwmac" }, 88 { } 89 }; 90 MODULE_DEVICE_TABLE(of, meson6_dwmac_match); 91 92 static struct platform_driver meson6_dwmac_driver = { 93 .probe = meson6_dwmac_probe, 94 .remove_new = stmmac_pltfr_remove, 95 .driver = { 96 .name = "meson6-dwmac", 97 .pm = &stmmac_pltfr_pm_ops, 98 .of_match_table = meson6_dwmac_match, 99 }, 100 }; 101 module_platform_driver(meson6_dwmac_driver); 102 103 MODULE_AUTHOR("Beniamino Galvani <b.galvani@gmail.com>"); 104 MODULE_DESCRIPTION("Amlogic Meson6 and Meson8 DWMAC glue layer"); 105 MODULE_LICENSE("GPL v2"); 106