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/* Xilinx GMII2RGMII Converter driver
*
* Copyright (C) 2016 Xilinx, Inc.
* Copyright (C) 2016 Andrew Lunn <andrew@lunn.ch>
*
* Author: Andrew Lunn <andrew@lunn.ch>
* Author: Kedareswara rao Appana <appanad@xilinx.com>
*
* Description:
* This driver is developed for Xilinx GMII2RGMII Converter
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/mii.h>
#include <linux/mdio.h>
#include <linux/phy.h>
#include <linux/of_mdio.h>
#define XILINX_GMII2RGMII_REG 0x10
#define XILINX_GMII2RGMII_SPEED_MASK (BMCR_SPEED1000 | BMCR_SPEED100)
struct gmii2rgmii {
struct phy_device *phy_dev;
struct phy_driver *phy_drv;
struct phy_driver conv_phy_drv;
struct mdio_device *mdio;
};
static int xgmiitorgmii_read_status(struct phy_device *phydev)
{
struct gmii2rgmii *priv = phydev->priv;
struct mii_bus *bus = priv->mdio->bus;
int addr = priv->mdio->addr;
u16 val = 0;
int err;
if (priv->phy_drv->read_status)
err = priv->phy_drv->read_status(phydev);
else
err = genphy_read_status(phydev);
if (err < 0)
return err;
val = mdiobus_read(bus, addr, XILINX_GMII2RGMII_REG);
val &= ~XILINX_GMII2RGMII_SPEED_MASK;
if (phydev->speed == SPEED_1000)
val |= BMCR_SPEED1000;
else if (phydev->speed == SPEED_100)
val |= BMCR_SPEED100;
else
val |= BMCR_SPEED10;
mdiobus_write(bus, addr, XILINX_GMII2RGMII_REG, val);
return 0;
}
static int xgmiitorgmii_probe(struct mdio_device *mdiodev)
{
struct device *dev = &mdiodev->dev;
struct device_node *np = dev->of_node, *phy_node;
struct gmii2rgmii *priv;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
phy_node = of_parse_phandle(np, "phy-handle", 0);
if (!phy_node) {
dev_err(dev, "Couldn't parse phy-handle\n");
return -ENODEV;
}
priv->phy_dev = of_phy_find_device(phy_node);
of_node_put(phy_node);
if (!priv->phy_dev) {
dev_info(dev, "Couldn't find phydev\n");
return -EPROBE_DEFER;
}
if (!priv->phy_dev->drv) {
dev_info(dev, "Attached phy not ready\n");
return -EPROBE_DEFER;
}
priv->mdio = mdiodev;
priv->phy_drv = priv->phy_dev->drv;
memcpy(&priv->conv_phy_drv, priv->phy_dev->drv,
sizeof(struct phy_driver));
priv->conv_phy_drv.read_status = xgmiitorgmii_read_status;
priv->phy_dev->priv = priv;
priv->phy_dev->drv = &priv->conv_phy_drv;
return 0;
}
static const struct of_device_id xgmiitorgmii_of_match[] = {
{ .compatible = "xlnx,gmii-to-rgmii-1.0" },
{},
};
MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match);
static struct mdio_driver xgmiitorgmii_driver = {
.probe = xgmiitorgmii_probe,
.mdiodrv.driver = {
.name = "xgmiitorgmii",
.of_match_table = xgmiitorgmii_of_match,
},
};
mdio_module_driver(xgmiitorgmii_driver);
MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver");
MODULE_LICENSE("GPL");
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