1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Adaptrum Anarion DWMAC glue layer 4 * 5 * Copyright (C) 2017, Adaptrum, Inc. 6 * (Written by Alexandru Gagniuc <alex.g at adaptrum.com> for Adaptrum, Inc.) 7 */ 8 9 #include <linux/io.h> 10 #include <linux/of.h> 11 #include <linux/of_net.h> 12 #include <linux/stmmac.h> 13 14 #include "stmmac.h" 15 #include "stmmac_platform.h" 16 17 #define GMAC_RESET_CONTROL_REG 0 18 #define GMAC_SW_CONFIG_REG 4 19 #define GMAC_CONFIG_INTF_SEL_MASK (0x7 << 0) 20 #define GMAC_CONFIG_INTF_RGMII (0x1 << 0) 21 22 struct anarion_gmac { 23 void __iomem *ctl_block; 24 uint32_t phy_intf_sel; 25 }; 26 27 static uint32_t gmac_read_reg(struct anarion_gmac *gmac, uint8_t reg) 28 { 29 return readl(gmac->ctl_block + reg); 30 }; 31 32 static void gmac_write_reg(struct anarion_gmac *gmac, uint8_t reg, uint32_t val) 33 { 34 writel(val, gmac->ctl_block + reg); 35 } 36 37 static int anarion_gmac_init(struct platform_device *pdev, void *priv) 38 { 39 uint32_t sw_config; 40 struct anarion_gmac *gmac = priv; 41 42 /* Reset logic, configure interface mode, then release reset. SIMPLE! */ 43 gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 1); 44 45 sw_config = gmac_read_reg(gmac, GMAC_SW_CONFIG_REG); 46 sw_config &= ~GMAC_CONFIG_INTF_SEL_MASK; 47 sw_config |= (gmac->phy_intf_sel & GMAC_CONFIG_INTF_SEL_MASK); 48 gmac_write_reg(gmac, GMAC_SW_CONFIG_REG, sw_config); 49 50 gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 0); 51 52 return 0; 53 } 54 55 static void anarion_gmac_exit(struct platform_device *pdev, void *priv) 56 { 57 struct anarion_gmac *gmac = priv; 58 59 gmac_write_reg(gmac, GMAC_RESET_CONTROL_REG, 1); 60 } 61 62 static struct anarion_gmac *anarion_config_dt(struct platform_device *pdev) 63 { 64 struct anarion_gmac *gmac; 65 phy_interface_t phy_mode; 66 void __iomem *ctl_block; 67 int err; 68 69 ctl_block = devm_platform_ioremap_resource(pdev, 1); 70 if (IS_ERR(ctl_block)) { 71 err = PTR_ERR(ctl_block); 72 dev_err(&pdev->dev, "Cannot get reset region (%d)!\n", err); 73 return ERR_PTR(err); 74 } 75 76 gmac = devm_kzalloc(&pdev->dev, sizeof(*gmac), GFP_KERNEL); 77 if (!gmac) 78 return ERR_PTR(-ENOMEM); 79 80 gmac->ctl_block = ctl_block; 81 82 err = of_get_phy_mode(pdev->dev.of_node, &phy_mode); 83 if (err) 84 return ERR_PTR(err); 85 86 switch (phy_mode) { 87 case PHY_INTERFACE_MODE_RGMII: 88 fallthrough; 89 case PHY_INTERFACE_MODE_RGMII_ID: 90 case PHY_INTERFACE_MODE_RGMII_RXID: 91 case PHY_INTERFACE_MODE_RGMII_TXID: 92 gmac->phy_intf_sel = GMAC_CONFIG_INTF_RGMII; 93 break; 94 default: 95 dev_err(&pdev->dev, "Unsupported phy-mode (%d)\n", 96 phy_mode); 97 return ERR_PTR(-ENOTSUPP); 98 } 99 100 return gmac; 101 } 102 103 static int anarion_dwmac_probe(struct platform_device *pdev) 104 { 105 int ret; 106 struct anarion_gmac *gmac; 107 struct plat_stmmacenet_data *plat_dat; 108 struct stmmac_resources stmmac_res; 109 110 ret = stmmac_get_platform_resources(pdev, &stmmac_res); 111 if (ret) 112 return ret; 113 114 gmac = anarion_config_dt(pdev); 115 if (IS_ERR(gmac)) 116 return PTR_ERR(gmac); 117 118 plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac); 119 if (IS_ERR(plat_dat)) 120 return PTR_ERR(plat_dat); 121 122 plat_dat->init = anarion_gmac_init; 123 plat_dat->exit = anarion_gmac_exit; 124 anarion_gmac_init(pdev, gmac); 125 plat_dat->bsp_priv = gmac; 126 127 return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); 128 } 129 130 static const struct of_device_id anarion_dwmac_match[] = { 131 { .compatible = "adaptrum,anarion-gmac" }, 132 { } 133 }; 134 MODULE_DEVICE_TABLE(of, anarion_dwmac_match); 135 136 static struct platform_driver anarion_dwmac_driver = { 137 .probe = anarion_dwmac_probe, 138 .remove = stmmac_pltfr_remove, 139 .driver = { 140 .name = "anarion-dwmac", 141 .pm = &stmmac_pltfr_pm_ops, 142 .of_match_table = anarion_dwmac_match, 143 }, 144 }; 145 module_platform_driver(anarion_dwmac_driver); 146 147 MODULE_DESCRIPTION("Adaptrum Anarion DWMAC specific glue layer"); 148 MODULE_AUTHOR("Alexandru Gagniuc <mr.nuke.me@gmail.com>"); 149 MODULE_LICENSE("GPL v2"); 150