1 /* Xilinx GMII2RGMII Converter driver 2 * 3 * Copyright (C) 2016 Xilinx, Inc. 4 * Copyright (C) 2016 Andrew Lunn <andrew@lunn.ch> 5 * 6 * Author: Andrew Lunn <andrew@lunn.ch> 7 * Author: Kedareswara rao Appana <appanad@xilinx.com> 8 * 9 * Description: 10 * This driver is developed for Xilinx GMII2RGMII Converter 11 * 12 * This program is free software: you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation, either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 */ 22 #include <linux/module.h> 23 #include <linux/kernel.h> 24 #include <linux/mii.h> 25 #include <linux/mdio.h> 26 #include <linux/phy.h> 27 #include <linux/of_mdio.h> 28 29 #define XILINX_GMII2RGMII_REG 0x10 30 #define XILINX_GMII2RGMII_SPEED_MASK (BMCR_SPEED1000 | BMCR_SPEED100) 31 32 struct gmii2rgmii { 33 struct phy_device *phy_dev; 34 struct phy_driver *phy_drv; 35 struct phy_driver conv_phy_drv; 36 struct mdio_device *mdio; 37 }; 38 39 static int xgmiitorgmii_read_status(struct phy_device *phydev) 40 { 41 struct gmii2rgmii *priv = phydev->priv; 42 struct mii_bus *bus = priv->mdio->bus; 43 int addr = priv->mdio->addr; 44 u16 val = 0; 45 int err; 46 47 err = priv->phy_drv->read_status(phydev); 48 if (err < 0) 49 return err; 50 51 val = mdiobus_read(bus, addr, XILINX_GMII2RGMII_REG); 52 val &= ~XILINX_GMII2RGMII_SPEED_MASK; 53 54 if (phydev->speed == SPEED_1000) 55 val |= BMCR_SPEED1000; 56 else if (phydev->speed == SPEED_100) 57 val |= BMCR_SPEED100; 58 else 59 val |= BMCR_SPEED10; 60 61 mdiobus_write(bus, addr, XILINX_GMII2RGMII_REG, val); 62 63 return 0; 64 } 65 66 static int xgmiitorgmii_probe(struct mdio_device *mdiodev) 67 { 68 struct device *dev = &mdiodev->dev; 69 struct device_node *np = dev->of_node, *phy_node; 70 struct gmii2rgmii *priv; 71 72 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 73 if (!priv) 74 return -ENOMEM; 75 76 phy_node = of_parse_phandle(np, "phy-handle", 0); 77 if (!phy_node) { 78 dev_err(dev, "Couldn't parse phy-handle\n"); 79 return -ENODEV; 80 } 81 82 priv->phy_dev = of_phy_find_device(phy_node); 83 of_node_put(phy_node); 84 if (!priv->phy_dev) { 85 dev_info(dev, "Couldn't find phydev\n"); 86 return -EPROBE_DEFER; 87 } 88 89 if (!priv->phy_dev->drv) { 90 dev_info(dev, "Attached phy not ready\n"); 91 return -EPROBE_DEFER; 92 } 93 94 priv->mdio = mdiodev; 95 priv->phy_drv = priv->phy_dev->drv; 96 memcpy(&priv->conv_phy_drv, priv->phy_dev->drv, 97 sizeof(struct phy_driver)); 98 priv->conv_phy_drv.read_status = xgmiitorgmii_read_status; 99 priv->phy_dev->priv = priv; 100 priv->phy_dev->drv = &priv->conv_phy_drv; 101 102 return 0; 103 } 104 105 static const struct of_device_id xgmiitorgmii_of_match[] = { 106 { .compatible = "xlnx,gmii-to-rgmii-1.0" }, 107 {}, 108 }; 109 MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match); 110 111 static struct mdio_driver xgmiitorgmii_driver = { 112 .probe = xgmiitorgmii_probe, 113 .mdiodrv.driver = { 114 .name = "xgmiitorgmii", 115 .of_match_table = xgmiitorgmii_of_match, 116 }, 117 }; 118 119 mdio_module_driver(xgmiitorgmii_driver); 120 121 MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver"); 122 MODULE_LICENSE("GPL"); 123