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