net: Add support for xilinx gmiitorgmii converter

CHANGE LOG ENTRY NEEDED HERE.

Signed-off-by: Kedareswara rao Appana <appanad@xilinx.com>
Not-Signed-off-by: Andrew Lunn <andrew@lunn.ch>

Documentation/devicetree/bindings/net/xilinx,gmiitorgmii.txt

@@ -0,0 +1 @@
+TODO

drivers/net/phy/Kconfig

@@ -271,6 +271,14 @@ config MDIO_BCM_IPROC
 	  This module provides a driver for the MDIO busses found in the
 	  Broadcom iProc SoC's.
 
+config XILINX_GMII2RGMII
+       tristate "Xilinx GMII2RGMII converter driver"
+       default y
+       ---help---
+         This driver support xilinx GMII to RGMII IP core it provides
+         the Reduced Gigabit Media Independent Interface(RGMII) between
+         Ethernet physical media devices and the Gigabit Ethernet controller.
+
 endif # PHYLIB
 
 config MICREL_KS8995MA

drivers/net/phy/Makefile

@@ -44,3 +44,4 @@ obj-$(CONFIG_MDIO_MOXART)	+= mdio-moxart.o
 obj-$(CONFIG_MDIO_BCM_UNIMAC)	+= mdio-bcm-unimac.o
 obj-$(CONFIG_MICROCHIP_PHY)	+= microchip.o
 obj-$(CONFIG_MDIO_BCM_IPROC)	+= mdio-bcm-iproc.o
+obj-$(CONFIG_XILINX_GMII2RGMII) += xilinx_gmii2rgmii.o

drivers/net/phy/xilinx_gmii2rgmii.c

@@ -0,0 +1,132 @@
+/* Xilinx GMII2RGMII Converter driver
+ *
+ * Copyright (C) 2016 Xilinx, Inc.
+ * Copyright (C) 2016 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/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/kernel.h>
+#include <linux/mdio.h>
+#include <linux/mii.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/of_mdio.h>
+#include <linux/phy.h>
+#include <linux/types.h>
+
+#define XILINX_GMII2RGMII_FULLDPLX	BMCR_FULLDPLX
+#define XILINX_GMII2RGMII_SPEED1000	BMCR_SPEED1000
+#define XILINX_GMII2RGMII_SPEED100	BMCR_SPEED100
+#define XILINX_GMII2RGMII_REG_NUM	0x10
+
+struct gmii2rgmii {
+	struct phy_device *phy_dev;
+	struct phy_driver phy_drv;
+	struct phy_driver *phy_drv_orig;
+};
+
+static int xgmiitorgmii_read_status(struct phy_device *phydev)
+{
+	printk("inside read_status\n");
+	return 0xffff;
+}
+
+static int xgmiitorgmii_config_init(struct phy_device *phydev)
+{
+	printk("Inside gmiitorgmii config_init\n");
+
+	return 0;
+}
+
+struct phy_driver gmiitorgmii_drv = {
+	.name = "xilinx,gmiitorgmii",
+	.features = PHY_GBIT_FEATURES,
+	.config_init = xgmiitorgmii_config_init,
+	.config_aneg = genphy_config_aneg,
+	.read_status = xgmiitorgmii_read_status,
+};
+
+int xgmiitorgmii_probe(struct mdio_device *mdiodev)
+{
+	struct device *dev = &mdiodev->dev;
+	struct device_node *np = dev->of_node, *phy_node;
+	struct gmii2rgmii *priv;
+	int ret = 0;
+
+	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");
+		ret = -ENODEV;
+		goto out;
+	}
+
+	priv->phy_dev = of_phy_find_device(phy_node);
+	if (!priv->phy_dev) {
+		ret = -EPROBE_DEFER;
+		dev_info(dev, "Couldn't find phydev\n");
+		goto out;
+	}
+
+	priv->phy_drv_orig = priv->phy_dev->drv;
+	memcpy(&priv->phy_drv, priv->phy_dev->drv, sizeof(struct phy_driver));
+	priv->phy_drv.read_status = xgmiitorgmii_read_status;
+	priv->phy_drv.config_init = xgmiitorgmii_config_init;
+	priv->phy_dev->drv = &priv->phy_drv;
+
+out:
+	return ret;
+}
+
+static void xgmiitorgmii_remove(struct mdio_device *mdiodev)
+{
+	printk("inside remove\n");
+}
+
+static const struct of_device_id xgmiitorgmii_of_match[] = {
+	{ .compatible = "xilinx,gmiitorgmii" },
+};
+MODULE_DEVICE_TABLE(of, xgmiitorgmii_of_match);
+
+static struct mdio_driver xgmiitorgmii_driver = {
+	.probe	= xgmiitorgmii_probe,
+	.remove = xgmiitorgmii_remove,
+	.mdiodrv.driver = {
+		.name = "xgmiitorgmii",
+		.of_match_table = xgmiitorgmii_of_match,
+	},
+};
+
+static int __init xgmiitorgmii_init(void)
+{
+	return mdio_driver_register(&xgmiitorgmii_driver);
+}
+module_init(xgmiitorgmii_init);
+
+static void __exit xgmiitorgmii_cleanup(void)
+{
+	mdio_driver_unregister(&xgmiitorgmii_driver);
+}
+module_exit(xgmiitorgmii_cleanup);
+
+MODULE_DEVICE_TABLE(mdio, xilinx_tbl);
+MODULE_DESCRIPTION("Xilinx GMII2RGMII converter driver");
+MODULE_LICENSE("GPL");