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 * 63 anarion_config_dt(struct platform_device *pdev, 64 struct plat_stmmacenet_data *plat_dat) 65 { 66 struct anarion_gmac *gmac; 67 void __iomem *ctl_block; 68 int err; 69 70 ctl_block = devm_platform_ioremap_resource(pdev, 1); 71 if (IS_ERR(ctl_block)) { 72 err = PTR_ERR(ctl_block); 73 dev_err(&pdev->dev, "Cannot get reset region (%d)!\n", err); 74 return ERR_PTR(err); 75 } 76 77 gmac = devm_kzalloc(&pdev->dev, sizeof(*gmac), GFP_KERNEL); 78 if (!gmac) 79 return ERR_PTR(-ENOMEM); 80 81 gmac->ctl_block = ctl_block; 82 83 switch (plat_dat->phy_interface) { 84 case PHY_INTERFACE_MODE_RGMII: 85 fallthrough; 86 case PHY_INTERFACE_MODE_RGMII_ID: 87 case PHY_INTERFACE_MODE_RGMII_RXID: 88 case PHY_INTERFACE_MODE_RGMII_TXID: 89 gmac->phy_intf_sel = GMAC_CONFIG_INTF_RGMII; 90 break; 91 default: 92 dev_err(&pdev->dev, "Unsupported phy-mode (%d)\n", 93 plat_dat->phy_interface); 94 return ERR_PTR(-ENOTSUPP); 95 } 96 97 return gmac; 98 } 99 100 static int anarion_dwmac_probe(struct platform_device *pdev) 101 { 102 int ret; 103 struct anarion_gmac *gmac; 104 struct plat_stmmacenet_data *plat_dat; 105 struct stmmac_resources stmmac_res; 106 107 ret = stmmac_get_platform_resources(pdev, &stmmac_res); 108 if (ret) 109 return ret; 110 111 plat_dat = devm_stmmac_probe_config_dt(pdev, stmmac_res.mac); 112 if (IS_ERR(plat_dat)) 113 return PTR_ERR(plat_dat); 114 115 gmac = anarion_config_dt(pdev, plat_dat); 116 if (IS_ERR(gmac)) 117 return PTR_ERR(gmac); 118 119 plat_dat->init = anarion_gmac_init; 120 plat_dat->exit = anarion_gmac_exit; 121 anarion_gmac_init(pdev, gmac); 122 plat_dat->bsp_priv = gmac; 123 124 return stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); 125 } 126 127 static const struct of_device_id anarion_dwmac_match[] = { 128 { .compatible = "adaptrum,anarion-gmac" }, 129 { } 130 }; 131 MODULE_DEVICE_TABLE(of, anarion_dwmac_match); 132 133 static struct platform_driver anarion_dwmac_driver = { 134 .probe = anarion_dwmac_probe, 135 .remove = stmmac_pltfr_remove, 136 .driver = { 137 .name = "anarion-dwmac", 138 .pm = &stmmac_pltfr_pm_ops, 139 .of_match_table = anarion_dwmac_match, 140 }, 141 }; 142 module_platform_driver(anarion_dwmac_driver); 143 144 MODULE_DESCRIPTION("Adaptrum Anarion DWMAC specific glue layer"); 145 MODULE_AUTHOR("Alexandru Gagniuc <mr.nuke.me@gmail.com>"); 146 MODULE_LICENSE("GPL v2"); 147