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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Loongson-1 DWMAC glue layer4 *5 * Copyright (C) 2011-2023 Keguang Zhang <keguang.zhang@gmail.com>6 */7 8#include <linux/mfd/syscon.h>9#include <linux/module.h>10#include <linux/of.h>11#include <linux/phy.h>12#include <linux/platform_device.h>13#include <linux/regmap.h>14 15#include "stmmac.h"16#include "stmmac_platform.h"17 18#define LS1B_GMAC0_BASE (0x1fe10000)19#define LS1B_GMAC1_BASE (0x1fe20000)20 21/* Loongson-1 SYSCON Registers */22#define LS1X_SYSCON0 (0x0)23#define LS1X_SYSCON1 (0x4)24 25/* Loongson-1B SYSCON Register Bits */26#define GMAC1_USE_UART1 BIT(4)27#define GMAC1_USE_UART0 BIT(3)28 29#define GMAC1_SHUT BIT(13)30#define GMAC0_SHUT BIT(12)31 32#define GMAC1_USE_TXCLK BIT(3)33#define GMAC0_USE_TXCLK BIT(2)34#define GMAC1_USE_PWM23 BIT(1)35#define GMAC0_USE_PWM01 BIT(0)36 37/* Loongson-1C SYSCON Register Bits */38#define GMAC_SHUT BIT(6)39 40#define PHY_INTF_SELI GENMASK(30, 28)41#define PHY_INTF_MII FIELD_PREP(PHY_INTF_SELI, 0)42#define PHY_INTF_RMII FIELD_PREP(PHY_INTF_SELI, 4)43 44struct ls1x_dwmac {45 struct plat_stmmacenet_data *plat_dat;46 struct regmap *regmap;47};48 49static int ls1b_dwmac_syscon_init(struct platform_device *pdev, void *priv)50{51 struct ls1x_dwmac *dwmac = priv;52 struct plat_stmmacenet_data *plat = dwmac->plat_dat;53 struct regmap *regmap = dwmac->regmap;54 struct resource *res;55 unsigned long reg_base;56 57 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);58 if (!res) {59 dev_err(&pdev->dev, "Could not get IO_MEM resources\n");60 return -EINVAL;61 }62 reg_base = (unsigned long)res->start;63 64 if (reg_base == LS1B_GMAC0_BASE) {65 switch (plat->phy_interface) {66 case PHY_INTERFACE_MODE_RGMII_ID:67 regmap_update_bits(regmap, LS1X_SYSCON0,68 GMAC0_USE_TXCLK | GMAC0_USE_PWM01,69 0);70 break;71 case PHY_INTERFACE_MODE_MII:72 regmap_update_bits(regmap, LS1X_SYSCON0,73 GMAC0_USE_TXCLK | GMAC0_USE_PWM01,74 GMAC0_USE_TXCLK | GMAC0_USE_PWM01);75 break;76 default:77 dev_err(&pdev->dev, "Unsupported PHY mode %u\n",78 plat->phy_interface);79 return -EOPNOTSUPP;80 }81 82 regmap_update_bits(regmap, LS1X_SYSCON0, GMAC0_SHUT, 0);83 } else if (reg_base == LS1B_GMAC1_BASE) {84 regmap_update_bits(regmap, LS1X_SYSCON0,85 GMAC1_USE_UART1 | GMAC1_USE_UART0,86 GMAC1_USE_UART1 | GMAC1_USE_UART0);87 88 switch (plat->phy_interface) {89 case PHY_INTERFACE_MODE_RGMII_ID:90 regmap_update_bits(regmap, LS1X_SYSCON1,91 GMAC1_USE_TXCLK | GMAC1_USE_PWM23,92 0);93 94 break;95 case PHY_INTERFACE_MODE_MII:96 regmap_update_bits(regmap, LS1X_SYSCON1,97 GMAC1_USE_TXCLK | GMAC1_USE_PWM23,98 GMAC1_USE_TXCLK | GMAC1_USE_PWM23);99 break;100 default:101 dev_err(&pdev->dev, "Unsupported PHY mode %u\n",102 plat->phy_interface);103 return -EOPNOTSUPP;104 }105 106 regmap_update_bits(regmap, LS1X_SYSCON1, GMAC1_SHUT, 0);107 } else {108 dev_err(&pdev->dev, "Invalid Ethernet MAC base address %lx",109 reg_base);110 return -EINVAL;111 }112 113 return 0;114}115 116static int ls1c_dwmac_syscon_init(struct platform_device *pdev, void *priv)117{118 struct ls1x_dwmac *dwmac = priv;119 struct plat_stmmacenet_data *plat = dwmac->plat_dat;120 struct regmap *regmap = dwmac->regmap;121 122 switch (plat->phy_interface) {123 case PHY_INTERFACE_MODE_MII:124 regmap_update_bits(regmap, LS1X_SYSCON1, PHY_INTF_SELI,125 PHY_INTF_MII);126 break;127 case PHY_INTERFACE_MODE_RMII:128 regmap_update_bits(regmap, LS1X_SYSCON1, PHY_INTF_SELI,129 PHY_INTF_RMII);130 break;131 default:132 dev_err(&pdev->dev, "Unsupported PHY-mode %u\n",133 plat->phy_interface);134 return -EOPNOTSUPP;135 }136 137 regmap_update_bits(regmap, LS1X_SYSCON0, GMAC0_SHUT, 0);138 139 return 0;140}141 142static int ls1x_dwmac_probe(struct platform_device *pdev)143{144 struct plat_stmmacenet_data *plat_dat;145 struct stmmac_resources stmmac_res;146 struct regmap *regmap;147 struct ls1x_dwmac *dwmac;148 int (*init)(struct platform_device *pdev, void *priv);149 int ret;150 151 ret = stmmac_get_platform_resources(pdev, &stmmac_res);152 if (ret)153 return ret;154 155 /* Probe syscon */156 regmap = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,157 "loongson,ls1-syscon");158 if (IS_ERR(regmap))159 return dev_err_probe(&pdev->dev, PTR_ERR(regmap),160 "Unable to find syscon\n");161 162 init = of_device_get_match_data(&pdev->dev);163 if (!init) {164 dev_err(&pdev->dev, "No of match data provided\n");165 return -EINVAL;166 }167 168 dwmac = devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL);169 if (!dwmac)170 return -ENOMEM;171 172 plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac);173 if (IS_ERR(plat_dat))174 return dev_err_probe(&pdev->dev, PTR_ERR(plat_dat),175 "dt configuration failed\n");176 177 plat_dat->bsp_priv = dwmac;178 plat_dat->init = init;179 dwmac->plat_dat = plat_dat;180 dwmac->regmap = regmap;181 182 return devm_stmmac_pltfr_probe(pdev, plat_dat, &stmmac_res);183}184 185static const struct of_device_id ls1x_dwmac_match[] = {186 {187 .compatible = "loongson,ls1b-gmac",188 .data = &ls1b_dwmac_syscon_init,189 },190 {191 .compatible = "loongson,ls1c-emac",192 .data = &ls1c_dwmac_syscon_init,193 },194 { }195};196MODULE_DEVICE_TABLE(of, ls1x_dwmac_match);197 198static struct platform_driver ls1x_dwmac_driver = {199 .probe = ls1x_dwmac_probe,200 .driver = {201 .name = "loongson1-dwmac",202 .of_match_table = ls1x_dwmac_match,203 },204};205module_platform_driver(ls1x_dwmac_driver);206 207MODULE_AUTHOR("Keguang Zhang <keguang.zhang@gmail.com>");208MODULE_DESCRIPTION("Loongson-1 DWMAC glue layer");209MODULE_LICENSE("GPL");210