LXR linux/drivers/net/phy/xilinx

   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
  32struct 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
  39static 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
  61static 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
  95static const struct of_device_id xgmiitorgmii_of_match[] = {
  96        { .compatible = "xlnx,gmii-to-rgmii-1.0" },
  97        {},
  98};
  99MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match);
 100
 101static 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
 109mdio_module_driver(xgmiitorgmii_driver);
 110
 111MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver");
 112MODULE_LICENSE("GPL");
 113