1 // SPDX-License-Identifier: GPL-2.0+ 2 /* Xilinx GMII2RGMII Converter driver 3 * 4 * Copyright (C) 2016 Xilinx, Inc. 5 * Copyright (C) 2016 Andrew Lunn <andrew@lunn.ch> 6 * 7 * Author: Andrew Lunn <andrew@lunn.ch> 8 * Author: Kedareswara rao Appana <appanad@xilinx.com> 9 * 10 * Description: 11 * This driver is developed for Xilinx GMII2RGMII Converter 12 */ 13 #include <linux/module.h> 14 #include <linux/kernel.h> 15 #include <linux/mii.h> 16 #include <linux/mdio.h> 17 #include <linux/phy.h> 18 #include <linux/clk.h> 19 #include <linux/of_mdio.h> 20 21 #define XILINX_GMII2RGMII_REG 0x10 22 #define XILINX_GMII2RGMII_SPEED_MASK (BMCR_SPEED1000 | BMCR_SPEED100) 23 24 struct gmii2rgmii { 25 struct phy_device *phy_dev; 26 const struct phy_driver *phy_drv; 27 struct phy_driver conv_phy_drv; 28 struct mdio_device *mdio; 29 }; 30 31 static void xgmiitorgmii_configure(struct gmii2rgmii *priv, int speed) 32 { 33 struct mii_bus *bus = priv->mdio->bus; 34 int addr = priv->mdio->addr; 35 u16 val; 36 37 val = mdiobus_read(bus, addr, XILINX_GMII2RGMII_REG); 38 val &= ~XILINX_GMII2RGMII_SPEED_MASK; 39 40 if (speed == SPEED_1000) 41 val |= BMCR_SPEED1000; 42 else if (speed == SPEED_100) 43 val |= BMCR_SPEED100; 44 else 45 val |= BMCR_SPEED10; 46 47 mdiobus_write(bus, addr, XILINX_GMII2RGMII_REG, val); 48 } 49 50 static int xgmiitorgmii_read_status(struct phy_device *phydev) 51 { 52 struct gmii2rgmii *priv = mdiodev_get_drvdata(&phydev->mdio); 53 int err; 54 55 if (priv->phy_drv->read_status) 56 err = priv->phy_drv->read_status(phydev); 57 else 58 err = genphy_read_status(phydev); 59 if (err < 0) 60 return err; 61 62 xgmiitorgmii_configure(priv, phydev->speed); 63 64 return 0; 65 } 66 67 static int xgmiitorgmii_set_loopback(struct phy_device *phydev, bool enable) 68 { 69 struct gmii2rgmii *priv = mdiodev_get_drvdata(&phydev->mdio); 70 int err; 71 72 if (priv->phy_drv->set_loopback) 73 err = priv->phy_drv->set_loopback(phydev, enable); 74 else 75 err = genphy_loopback(phydev, enable); 76 if (err < 0) 77 return err; 78 79 xgmiitorgmii_configure(priv, phydev->speed); 80 81 return 0; 82 } 83 84 static int xgmiitorgmii_probe(struct mdio_device *mdiodev) 85 { 86 struct device *dev = &mdiodev->dev; 87 struct device_node *np = dev->of_node, *phy_node; 88 struct gmii2rgmii *priv; 89 struct clk *clkin; 90 91 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 92 if (!priv) 93 return -ENOMEM; 94 95 clkin = devm_clk_get_optional_enabled(dev, NULL); 96 if (IS_ERR(clkin)) 97 return dev_err_probe(dev, PTR_ERR(clkin), 98 "Failed to get and enable clock from Device Tree\n"); 99 100 phy_node = of_parse_phandle(np, "phy-handle", 0); 101 if (!phy_node) { 102 dev_err(dev, "Couldn't parse phy-handle\n"); 103 return -ENODEV; 104 } 105 106 priv->phy_dev = of_phy_find_device(phy_node); 107 of_node_put(phy_node); 108 if (!priv->phy_dev) { 109 dev_info(dev, "Couldn't find phydev\n"); 110 return -EPROBE_DEFER; 111 } 112 113 if (!priv->phy_dev->drv) { 114 dev_info(dev, "Attached phy not ready\n"); 115 put_device(&priv->phy_dev->mdio.dev); 116 return -EPROBE_DEFER; 117 } 118 119 priv->mdio = mdiodev; 120 priv->phy_drv = priv->phy_dev->drv; 121 memcpy(&priv->conv_phy_drv, priv->phy_dev->drv, 122 sizeof(struct phy_driver)); 123 priv->conv_phy_drv.read_status = xgmiitorgmii_read_status; 124 priv->conv_phy_drv.set_loopback = xgmiitorgmii_set_loopback; 125 mdiodev_set_drvdata(&priv->phy_dev->mdio, priv); 126 priv->phy_dev->drv = &priv->conv_phy_drv; 127 128 return 0; 129 } 130 131 static const struct of_device_id xgmiitorgmii_of_match[] = { 132 { .compatible = "xlnx,gmii-to-rgmii-1.0" }, 133 {}, 134 }; 135 MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match); 136 137 static struct mdio_driver xgmiitorgmii_driver = { 138 .probe = xgmiitorgmii_probe, 139 .mdiodrv.driver = { 140 .name = "xgmiitorgmii", 141 .of_match_table = xgmiitorgmii_of_match, 142 }, 143 }; 144 145 mdio_module_driver(xgmiitorgmii_driver); 146 147 MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver"); 148 MODULE_LICENSE("GPL"); 149