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 int addr; 37 }; 38 39 static int xgmiitorgmii_read_status(struct phy_device *phydev) 40 { 41 struct gmii2rgmii *priv = phydev->priv; 42 u16 val = 0; 43 44 priv->phy_drv->read_status(phydev); 45 46 val = mdiobus_read(phydev->mdio.bus, priv->addr, XILINX_GMII2RGMII_REG); 47 val &= ~XILINX_GMII2RGMII_SPEED_MASK; 48 49 if (phydev->speed == SPEED_1000) 50 val |= BMCR_SPEED1000; 51 else if (phydev->speed == SPEED_100) 52 val |= BMCR_SPEED100; 53 else 54 val |= BMCR_SPEED10; 55 56 mdiobus_write(phydev->mdio.bus, priv->addr, XILINX_GMII2RGMII_REG, val); 57 58 return 0; 59 } 60 61 static int xgmiitorgmii_probe(struct mdio_device *mdiodev) 62 { 63 struct device *dev = &mdiodev->dev; 64 struct device_node *np = dev->of_node, *phy_node; 65 struct gmii2rgmii *priv; 66 67 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); 68 if (!priv) 69 return -ENOMEM; 70 71 phy_node = of_parse_phandle(np, "phy-handle", 0); 72 if (!phy_node) { 73 dev_err(dev, "Couldn't parse phy-handle\n"); 74 return -ENODEV; 75 } 76 77 priv->phy_dev = of_phy_find_device(phy_node); 78 of_node_put(phy_node); 79 if (!priv->phy_dev) { 80 dev_info(dev, "Couldn't find phydev\n"); 81 return -EPROBE_DEFER; 82 } 83 84 priv->addr = mdiodev->addr; 85 priv->phy_drv = priv->phy_dev->drv; 86 memcpy(&priv->conv_phy_drv, priv->phy_dev->drv, 87 sizeof(struct phy_driver)); 88 priv->conv_phy_drv.read_status = xgmiitorgmii_read_status; 89 priv->phy_dev->priv = priv; 90 priv->phy_dev->drv = &priv->conv_phy_drv; 91 92 return 0; 93 } 94 95 static const struct of_device_id xgmiitorgmii_of_match[] = { 96 { .compatible = "xlnx,gmii-to-rgmii-1.0" }, 97 {}, 98 }; 99 MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match); 100 101 static struct mdio_driver xgmiitorgmii_driver = { 102 .probe = xgmiitorgmii_probe, 103 .mdiodrv.driver = { 104 .name = "xgmiitorgmii", 105 .of_match_table = xgmiitorgmii_of_match, 106 }, 107 }; 108 109 mdio_module_driver(xgmiitorgmii_driver); 110 111 MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver"); 112 MODULE_LICENSE("GPL"); 113