[PATCH 3/5] net: add Hisilicon Network Subsystem MDIO support

[Kenneth Lee]

The MDIO support for Hisilicon Network Subsystem. It is used in Hislicon
P660 and Hi1610 SoC to control the external PHY

Signed-off-by: Yisen Zhuang <Yisen.Zhuang@xxxxxxxxxx>
Signed-off-by: Kenneth Lee <liguozhu@xxxxxxxxxx>
---
 drivers/net/ethernet/hisilicon/hns/hns_mdio_main.c | 597 +++++++++++++++++++++
 1 file changed, 597 insertions(+)
 create mode 100644 drivers/net/ethernet/hisilicon/hns/hns_mdio_main.c

diff --git a/drivers/net/ethernet/hisilicon/hns/hns_mdio_main.c b/drivers/net/ethernet/hisilicon/hns/hns_mdio_main.c
new file mode 100644
index 0000000..7113fa8
--- /dev/null
+++ b/drivers/net/ethernet/hisilicon/hns/hns_mdio_main.c
@@ -0,0 +1,597 @@
+/*
+ * Copyright (c) 2014-2015 Hisilicon Limited.
+ *
+ * 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.
+ */
+
+#include <linux/errno.h>
+#include <linux/etherdevice.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/netdevice.h>
+#include <linux/of_address.h>
+#include <linux/of.h>
+#include <linux/of_mdio.h>
+#include <linux/of_platform.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock_types.h>
+
+#define MDIO_DRV_NAME "hi-mdio"
+#define MDIO_BUS_NAME "Hisilicon MII Bus"
+#define MDIO_DRV_VERSION "1.1.0"
+#define MDIO_COPYRIGHT "Copyright(c) 2015 Huawei Corporation."
+#define MDIO_DRV_STRING MDIO_BUS_NAME
+#define MDIO_DEFAULT_DEVICE_DESCR MDIO_BUS_NAME
+
+#define MDIO_CTL_DEV_ADDR(x)	(x & 0x1f)
+#define MDIO_CTL_PORT_ADDR(x)	((x & 0x1f) << 5)
+
+#define MDIO_BASE_ADDR			0x403C0000
+#define MDIO_REG_ADDR_LEN		0x1000
+#define MDIO_PHY_GRP_LEN		0x100
+#define MDIO_REG_LEN			0x10
+#define MDIO_PHY_ADDR_NUM		5
+#define MDIO_MAX_PHY_ADDR		0x1F
+#define MDIO_MAX_PHY_REG_ADDR		0xFFFF
+
+#define MDIO_TIMEOUT			1000000
+
+struct hns_mdio_device {
+	struct device *dev;
+	void *vbase;		/* mdio reg base address */
+	u8 phy_class[PHY_MAX_ADDR];
+	u8 index;
+	u8 chip_id;
+	u8 gidx;		/* global index */
+};
+
+#define MDIO_COMMAND_REG		0x0
+#define MDIO_ADDR_REG			0x4
+#define MDIO_WDATA_REG			0x8
+#define MDIO_RDATA_REG			0xc
+#define MDIO_STA_REG			0x10
+
+#define MDIO_CMD_DEVAD_M	0x1f
+#define MDIO_CMD_DEVAD_S	0
+#define MDIO_CMD_PRTAD_M	0x1f
+#define MDIO_CMD_PRTAD_S	5
+#define MDIO_CMD_OP_M		0x3
+#define MDIO_CMD_OP_S		10
+#define MDIO_CMD_ST_M		0x3
+#define MDIO_CMD_ST_S		12
+#define MDIO_CMD_START_B	14
+
+#define MDIO_ADDR_DATA_M	0xffff
+#define MDIO_ADDR_DATA_S	0
+
+#define MDIO_WDATA_DATA_M	0xffff
+#define MDIO_WDATA_DATA_S	0
+
+#define MDIO_RDATA_DATA_M	0xffff
+#define MDIO_RDATA_DATA_S	0
+
+#define MDIO_STATE_STA_B	0
+
+enum mdio_st_clause {
+	MDIO_ST_CLAUSE_45 = 0,
+	MDIO_ST_CLAUSE_22
+};
+
+enum mdio_c22_op_seq {
+	MDIO_C22_WRITE = 1,
+	MDIO_C22_READ = 2
+};
+
+enum mdio_c45_op_seq {
+	MDIO_C45_WRITE_ADDR = 0,
+	MDIO_C45_WRITE_DATA,
+	MDIO_C45_READ_INCREMENT,
+	MDIO_C45_READ
+};
+
+static inline void mdio_write_reg(void *base, u32 reg, u32 value)
+{
+	u8 __iomem *reg_addr = ACCESS_ONCE(base);
+
+	writel(value, reg_addr + reg);
+}
+
+#define MDIO_WRITE_REG(a, reg, value) \
+	mdio_write_reg((a)->vbase, (reg), (value))
+
+static inline u32 mdio_read_reg(void *base, u32 reg)
+{
+	u8 __iomem *reg_addr = ACCESS_ONCE(base);
+
+	return readl(reg_addr + reg);
+}
+
+#define MDIO_READ_REG(a, reg) \
+	mdio_read_reg((a)->vbase, (reg))
+
+#define mdio_set_field(origin, mask, shift, val) \
+	do { \
+		(origin) &= (~((mask) << (shift))); \
+		(origin) |= (((val) & (mask)) << (shift)); \
+	} while (0)
+
+#define mdio_get_field(origin, mask, shift) (((origin) >> (shift)) & (mask))
+
+static void mdio_set_reg_field(void *base, u32 reg, u32 mask, u32 shift,
+			       u32 val)
+{
+	u32 origin = mdio_read_reg(base, reg);
+
+	mdio_set_field(origin, mask, shift, val);
+	mdio_write_reg(base, reg, origin);
+}
+
+#define MDIO_SET_REG_FIELD(dev, reg, mask, shift, val) \
+	mdio_set_reg_field((dev)->vbase, (reg), (mask), (shift), (val))
+
+static u32 mdio_get_reg_field(void *base, u32 reg, u32 mask, u32 shift)
+{
+	u32 origin;
+
+	origin = mdio_read_reg(base, reg);
+	return mdio_get_field(origin, mask, shift);
+}
+
+#define MDIO_GET_REG_FIELD(dev, reg, mask, shift) \
+		mdio_get_reg_field((dev)->vbase, (reg), (mask), (shift))
+
+#define MDIO_SET_REG_BIT(dev, reg, bit, val) \
+		mdio_set_reg_field((dev)->vbase, (reg), 0x1ull, (bit), (val))
+
+#define MDIO_GET_REG_BIT(dev, reg, bit) \
+		mdio_get_reg_field((dev)->vbase, (reg), 0x1ull, (bit))
+
+/**
+ *hns_mdio_read_hw - read phy regs
+ *@mdio_dev: mdio device
+ *@phy_addr:phy addr
+ *@is_c45:
+ *@page:
+ *@reg: reg
+ *@data:regs data
+ *return status
+ */
+static int hns_mdio_read_hw(struct hns_mdio_device *mdio_dev, u8 phy_addr,
+			    u8 is_c45, u8 page, u16 reg, u16 *data)
+{
+	u32 cmd_reg_value;
+	u32 sta_reg_value;
+	u32 time_cnt;
+
+	if (phy_addr > MDIO_MAX_PHY_ADDR) {
+		dev_err(mdio_dev->dev, "Wrong phy address: phy_addr(%x)\n",
+			phy_addr);
+		return -EINVAL;
+	}
+
+	dev_dbg(mdio_dev->dev, "mdio(%d) base is %p\n",
+		mdio_dev->gidx, mdio_dev->vbase);
+	dev_dbg(mdio_dev->dev,
+		"phy_addr=%d, is_c45=%d, devad=%d, regnum=%#x!\n",
+		phy_addr, is_c45, page, reg);
+
+	/* Step 1; waiting for MDIO_COMMAND_REG 's mdio_start==0,	*/
+	/*	after that can do read or write*/
+	for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) {
+		cmd_reg_value = MDIO_GET_REG_BIT(mdio_dev,
+						 MDIO_COMMAND_REG,
+						 MDIO_CMD_START_B);
+		if (!cmd_reg_value)
+			break;
+	}
+	if (cmd_reg_value) {
+		dev_err(mdio_dev->dev, "MDIO is busy!\n");
+		return -EBUSY;
+	}
+
+	if (!is_c45) {
+		cmd_reg_value = MDIO_ST_CLAUSE_22 << MDIO_CMD_ST_S;
+		cmd_reg_value |= MDIO_C22_READ << MDIO_CMD_OP_S;
+		cmd_reg_value |=
+			(phy_addr & MDIO_CMD_PRTAD_M) << MDIO_CMD_PRTAD_S;
+		cmd_reg_value |= (reg & MDIO_CMD_DEVAD_M) << MDIO_CMD_DEVAD_S;
+		cmd_reg_value |= 1 << MDIO_CMD_START_B;
+
+		MDIO_WRITE_REG(mdio_dev, MDIO_COMMAND_REG, cmd_reg_value);
+	} else {
+		MDIO_SET_REG_FIELD(mdio_dev, MDIO_ADDR_REG, MDIO_ADDR_DATA_M,
+				   MDIO_ADDR_DATA_S, reg);
+
+		/* Step 2; config the cmd-reg to write addr*/
+		cmd_reg_value = MDIO_ST_CLAUSE_45 << MDIO_CMD_ST_S;
+		cmd_reg_value |= MDIO_C45_WRITE_ADDR << MDIO_CMD_OP_S;
+
+		/* mdio_st==2'b00: is configing port addr*/
+		cmd_reg_value |=
+			(phy_addr & MDIO_CMD_PRTAD_M) << MDIO_CMD_PRTAD_S;
+
+		/* mdio_st == 2'b00: is configing dev_addr*/
+		cmd_reg_value |= (page & MDIO_CMD_DEVAD_M) << MDIO_CMD_DEVAD_S;
+		cmd_reg_value |= 1 << MDIO_CMD_START_B;
+		MDIO_WRITE_REG(mdio_dev, MDIO_COMMAND_REG, cmd_reg_value);
+
+		/* Step 3; waiting for MDIO_COMMAND_REG 's mdio_start==0,*/
+		/*check for read or write opt is finished */
+		for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) {
+			cmd_reg_value = MDIO_GET_REG_BIT(mdio_dev,
+							 MDIO_COMMAND_REG,
+							 MDIO_CMD_START_B);
+			if (!cmd_reg_value)
+				break;
+		}
+		if (cmd_reg_value) {
+			dev_err(mdio_dev->dev, "MDIO is busy\n");
+			return -EBUSY;
+		}
+
+		/* Step 4; config cmd-reg, send read opt */
+		cmd_reg_value = MDIO_ST_CLAUSE_45 << MDIO_CMD_ST_S;
+		cmd_reg_value |= MDIO_C45_READ << MDIO_CMD_OP_S;
+
+		/* mdio_st==2'b00: is configing port addr*/
+		cmd_reg_value |=
+			(phy_addr & MDIO_CMD_PRTAD_M) << MDIO_CMD_PRTAD_S;
+
+		/* mdio_st == 2'b00: is configing dev_addr*/
+		cmd_reg_value |= (page & MDIO_CMD_DEVAD_M) << MDIO_CMD_DEVAD_S;
+		cmd_reg_value |= 1 << MDIO_CMD_START_B;
+		MDIO_WRITE_REG(mdio_dev, MDIO_COMMAND_REG, cmd_reg_value);
+	}
+
+	/* Step 5; waiting for MDIO_COMMAND_REG 's mdio_start==0,*/
+	/* check for read or write opt is finished */
+	for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) {
+		cmd_reg_value = MDIO_GET_REG_BIT(mdio_dev,
+						 MDIO_COMMAND_REG,
+						 MDIO_CMD_START_B);
+		if (!cmd_reg_value)
+			break;
+	}
+	if (cmd_reg_value) {
+		dev_err(mdio_dev->dev, "MDIO is busy\n");
+		return -EBUSY;
+	}
+
+	sta_reg_value = MDIO_GET_REG_BIT(mdio_dev,
+					 MDIO_STA_REG, MDIO_STATE_STA_B);
+	if (sta_reg_value) {
+		dev_err(mdio_dev->dev, "MDIO Read failed!\n");
+		return -EBUSY;
+	}
+
+	/* Step 6; get out data*/
+	*data = (u16)MDIO_GET_REG_FIELD(mdio_dev, MDIO_RDATA_REG,
+					MDIO_RDATA_DATA_M, MDIO_RDATA_DATA_S);
+
+	return 0;
+}
+
+/**
+ *hns_mdio_write_hw - write phy regs
+ *@mdio_dev: mdio device
+ *@phy_addr: phy addr
+ *@is_c45: 0 means the clause 22, none 0 means clause 45
+ *@page: phy page addr
+ *@reg:  phy reg
+ *@data: regs data
+ *return status
+ */
+static int hns_mdio_write_hw(struct hns_mdio_device *mdio_dev, u8 phy_addr,
+			     u8 is_c45, u8 page, u16 reg, u16 data)
+{
+	u32 cmd_reg_value;
+	u32 time_cnt;
+
+	if (phy_addr > MDIO_MAX_PHY_ADDR) {
+		dev_err(mdio_dev->dev, "Wrong phy address: phy_addr(%x)\n",
+			phy_addr);
+		return -EINVAL;
+	}
+
+	dev_dbg(mdio_dev->dev, "mdio(%d) base is %p,write data=%d\n",
+		mdio_dev->gidx, mdio_dev->vbase, data);
+	dev_dbg(mdio_dev->dev, "phy_addr=%d, is_c45=%d, devad=%d, regnum=%#x\n",
+		phy_addr, is_c45, page, reg);
+
+	/* Step 1; waiting for MDIO_COMMAND_REG 's mdio_start==0,*/
+	/*	after that can do read or wtrite*/
+	for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) {
+		cmd_reg_value = MDIO_GET_REG_BIT(mdio_dev,
+						 MDIO_COMMAND_REG,
+						 MDIO_CMD_START_B);
+		if (!cmd_reg_value)
+			break;
+	}
+	if (cmd_reg_value) {
+		dev_err(mdio_dev->dev, "MDIO is busy\n");
+		return -EBUSY;
+	}
+
+	if (!is_c45) {
+		MDIO_SET_REG_FIELD(mdio_dev, MDIO_WDATA_REG, MDIO_WDATA_DATA_M,
+				   MDIO_WDATA_DATA_S, data);
+
+		cmd_reg_value = MDIO_ST_CLAUSE_22 << MDIO_CMD_ST_S;
+		cmd_reg_value |= MDIO_C22_WRITE << MDIO_CMD_OP_S;
+		cmd_reg_value |=
+			(phy_addr & MDIO_CMD_PRTAD_M) << MDIO_CMD_PRTAD_S;
+		cmd_reg_value |= (reg & MDIO_CMD_DEVAD_M) << MDIO_CMD_DEVAD_S;
+		cmd_reg_value |= 1 << MDIO_CMD_START_B;
+
+		MDIO_WRITE_REG(mdio_dev, MDIO_COMMAND_REG, cmd_reg_value);
+	} else {
+		/* Step 2; config the cmd-reg to write addr*/
+		MDIO_SET_REG_FIELD(mdio_dev, MDIO_ADDR_REG, MDIO_ADDR_DATA_M,
+				   MDIO_ADDR_DATA_S, reg);
+
+		cmd_reg_value = MDIO_ST_CLAUSE_45 << MDIO_CMD_ST_S;
+		cmd_reg_value |= MDIO_C45_WRITE_ADDR << MDIO_CMD_OP_S;
+
+		/* mdio_st==2'b00: is configing port addr*/
+		cmd_reg_value |=
+			(phy_addr & MDIO_CMD_PRTAD_M) << MDIO_CMD_PRTAD_S;
+
+		/* mdio_st == 2'b00: is configing dev_addr*/
+		cmd_reg_value |= (page & MDIO_CMD_DEVAD_M) << MDIO_CMD_DEVAD_S;
+		cmd_reg_value |= 1 << MDIO_CMD_START_B;
+		MDIO_WRITE_REG(mdio_dev, MDIO_COMMAND_REG, cmd_reg_value);
+
+		/* Step 3; waiting for MDIO_COMMAND_REG's mdio_start==0,*/
+		/* check for read or write opt is finished */
+		for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) {
+			cmd_reg_value = MDIO_GET_REG_BIT(mdio_dev,
+							 MDIO_COMMAND_REG,
+							 MDIO_CMD_START_B);
+			if (!cmd_reg_value)
+				break;
+		}
+		if (cmd_reg_value) {
+			dev_err(mdio_dev->dev, "MDIO is busy\n");
+			return -EBUSY;
+		}
+
+		/* Step 4; config the data needed writing */
+		MDIO_SET_REG_FIELD(mdio_dev, MDIO_WDATA_REG, MDIO_WDATA_DATA_M,
+				   MDIO_WDATA_DATA_S, data);
+
+		/* Step 5; config the cmd-reg for the write opt*/
+		cmd_reg_value = MDIO_ST_CLAUSE_45 << MDIO_CMD_ST_S;
+		cmd_reg_value |= MDIO_C45_WRITE_DATA << MDIO_CMD_OP_S;
+
+		/* mdio_st==2'b00: is configing port addr*/
+		cmd_reg_value |=
+			(phy_addr & MDIO_CMD_PRTAD_M) << MDIO_CMD_PRTAD_S;
+
+		/* mdio_st == 2'b00: is configing dev_addr*/
+		cmd_reg_value |= (page & MDIO_CMD_DEVAD_M) << MDIO_CMD_DEVAD_S;
+		cmd_reg_value |= 1 << MDIO_CMD_START_B;
+		MDIO_WRITE_REG(mdio_dev, MDIO_COMMAND_REG, cmd_reg_value);
+	}
+
+	return 0;
+}
+
+/**
+ * hns_mdio_get_chip_id - get parent node's chip-id attribute
+ * @dpev: mdio platform device
+ * return chip id if found the chip-id, or return 0
+ */
+static u32 hns_mdio_get_chip_id(struct platform_device *pdev)
+{
+	struct device_node *np;
+	u32 chip_id;
+	int ret;
+
+	np = of_get_parent(pdev->dev.of_node);
+	if (!np)
+		return 0;
+
+	ret = of_property_read_u32(np, "chip-id", &chip_id);
+	if (ret)
+		return 0;
+
+	return chip_id;
+}
+
+/**
+ * hns_mdio_write - access phy register
+ * @bus: mdio bus
+ * @phy_id: phy id
+ * @regnum: register num
+ * @value: register value
+ *
+ * Return 0 on success, negative on failure
+ */
+static int hns_mdio_write(struct mii_bus *bus,
+			  int phy_id, int regnum, u16 value)
+{
+	int ret;
+	struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
+	u8 devad = ((regnum >> 16) & 0x1f);
+	u8 is_c45 = !!(regnum & MII_ADDR_C45);
+
+	ret = hns_mdio_write_hw(mdio_dev, phy_id, is_c45, devad,
+				(u16)(regnum & 0xffff), value);
+	if (ret) {
+		dev_err(&bus->dev, "write_phy_reg fail, phy_id=%d, devad=%d,regnum=%#x, value=%#x!\n",
+			phy_id, devad, regnum, value);
+
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * hns_mdio_read - access phy register
+ * @bus: mdio bus
+ * @phy_id: phy id
+ * @regnum: register num
+ * @value: register value
+ *
+ * Return phy register value
+ */
+static int hns_mdio_read(struct mii_bus *bus, int phy_id, int regnum)
+{
+	int ret;
+	u16 reg_val = 0;
+	u8 devad = ((regnum >> 16) & 0x1f);
+	u8 is_c45 = !!(regnum & MII_ADDR_C45);
+	struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
+
+	ret = hns_mdio_read_hw(mdio_dev, phy_id, is_c45, devad,
+			       (u16)(regnum & 0xffff), &reg_val);
+	if (ret) {
+		dev_err(&bus->dev, "read_phy_reg fail, mdio_idx=%d, phy_id=%d, devad=%d,regnum=%#x!\n",
+			mdio_dev->gidx,	phy_id, devad, regnum);
+
+		return ret;
+	}
+
+	return reg_val;
+}
+
+/**
+ * hns_mdio_reset - reset mdio bus
+ * @bus: mdio bus
+ *
+ * Return 0 on success, negative on failure
+ */
+static int hns_mdio_reset(struct mii_bus *bus)
+{
+	return 0;
+}
+
+/**
+ * hns_mdio_bus_name - get mdio bus name
+ * @name: mdio bus name
+ * @np: mdio device node pointer
+ */
+static void hns_mdio_bus_name(char *name, struct device_node *np)
+{
+	const u32 *addr;
+	u64 taddr = OF_BAD_ADDR;
+
+	addr = of_get_address(np, 0, NULL, NULL);
+	if (addr)
+		taddr = of_translate_address(np, addr);
+
+	snprintf(name, MII_BUS_ID_SIZE, "%s@%llx", np->name,
+		 (unsigned long long)taddr);
+}
+
+/**
+ * hns_mdio_probe - probe mdio device
+ * @pdev: mdio platform device
+ *
+ * Return 0 on success, negative on failure
+ */
+static int hns_mdio_probe(struct platform_device *pdev)
+{
+	struct device_node *np;
+	struct hns_mdio_device *mdio_dev;
+	struct mii_bus *new_bus;
+	struct resource *res;
+	int ret;
+
+	if (!pdev) {
+		dev_err(NULL, "pdev is NULL!\r\n");
+		return -ENODEV;
+	}
+	np = pdev->dev.of_node;
+	mdio_dev = devm_kzalloc(&pdev->dev, sizeof(*mdio_dev), GFP_KERNEL);
+	if (!mdio_dev)
+		return -ENOMEM;
+
+	new_bus = devm_mdiobus_alloc(&pdev->dev);
+	if (!new_bus) {
+		dev_err(&pdev->dev, "mdiobus_alloc fail!\n");
+		return -ENOMEM;
+	}
+
+	new_bus->name = MDIO_BUS_NAME;
+	new_bus->read = hns_mdio_read;
+	new_bus->write = hns_mdio_write;
+	new_bus->reset = hns_mdio_reset;
+	new_bus->priv = mdio_dev;
+	hns_mdio_bus_name(new_bus->id, np);
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	mdio_dev->vbase = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(mdio_dev->vbase)) {
+		ret = PTR_ERR(mdio_dev->vbase);
+		return -EFAULT;
+	}
+	mdio_dev->index = 0;
+	mdio_dev->chip_id = hns_mdio_get_chip_id(pdev);
+	mdio_dev->gidx = mdio_dev->chip_id;
+	mdio_dev->dev = &pdev->dev;
+
+	new_bus->irq = devm_kcalloc(&pdev->dev, PHY_MAX_ADDR,
+				    sizeof(int), GFP_KERNEL);
+	if (!new_bus->irq)
+		return -ENOMEM;
+
+	new_bus->parent = &pdev->dev;
+	platform_set_drvdata(pdev, new_bus);
+
+	ret = of_mdiobus_register(new_bus, np);
+	if (ret) {
+		dev_err(&pdev->dev, "Cannot register as MDIO bus!\n");
+		platform_set_drvdata(pdev, NULL);
+		return ret;
+	}
+
+	return 0;
+}
+
+/**
+ * hns_mdio_remove - remove mdio device
+ * @pdev: mdio platform device
+ *
+ * Return 0 on success, negative on failure
+ */
+static int hns_mdio_remove(struct platform_device *pdev)
+{
+	struct hns_mdio_device *mdio_dev;
+	struct mii_bus *bus;
+
+	bus = platform_get_drvdata(pdev);
+	mdio_dev = (struct hns_mdio_device *)bus->priv;
+
+	mdiobus_unregister(bus);
+	platform_set_drvdata(pdev, NULL);
+	return 0;
+}
+
+static const struct of_device_id hns_mdio_match[] = {
+	{.compatible = "hisilicon,mdio"},
+	{}
+};
+
+static struct platform_driver hns_mdio_driver = {
+	.probe = hns_mdio_probe,
+	.remove = hns_mdio_remove,
+	.driver = {
+		   .name = MDIO_DRV_NAME,
+		   .of_match_table = hns_mdio_match,
+		   },
+};
+
+module_platform_driver(hns_mdio_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Huawei Tech. Co., Ltd.");
+MODULE_DESCRIPTION("Hisilicon HNS MDIO driver");
+MODULE_ALIAS("platform:" MDIO_DRV_NAME);
-- 
1.9.1

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