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net: add Hisilicon Network Subsystem MDIO support

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The MDIO support for Hisilicon Network Subsystem. It is used in Hislicon
hip04, hip05 and Hi1610 SoC to control the external PHY

Signed-off-by: huangdaode <huangdaode@hisilicon.com>
Signed-off-by: Yisen Zhuang <Yisen.Zhuang@huawei.com>
Signed-off-by: Kenneth Lee <liguozhu@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
huangdaode 2015-09-17 14:51:47 +08:00 committed by David S. Miller
parent fc7e37c6b2
commit 5b904d3940
4 changed files with 531 additions and 187 deletions
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10
drivers/net/ethernet/hisilicon/Kconfig
View File

@ -5,7 +5,7 @@
config NET_VENDOR_HISILICON
bool "Hisilicon devices"
default y
depends on ARM
depends on ARM || ARM64
---help---
If you have a network (Ethernet) card belonging to this class, say Y.
@ -27,8 +27,16 @@ config HIP04_ETH
select PHYLIB
select MARVELL_PHY
select MFD_SYSCON
select HNS_MDIO
---help---
If you wish to compile a kernel for a hardware with hisilicon p04 SoC and
want to use the internal ethernet then you should answer Y to this.
config HNS_MDIO
tristate "Hisilicon HNS MDIO device Support"
select MDIO
---help---
This selects the HNS MDIO support. It is needed by HNS_DSAF to access
the PHY
endif # NET_VENDOR_HISILICON

3
drivers/net/ethernet/hisilicon/Makefile
View File

@ -3,4 +3,5 @@
#
obj-$(CONFIG_HIX5HD2_GMAC) += hix5hd2_gmac.o
obj-$(CONFIG_HIP04_ETH) += hip04_mdio.o hip04_eth.o
obj-$(CONFIG_HIP04_ETH) += hip04_eth.o
obj-$(CONFIG_HNS_MDIO) += hns_mdio.o

185
drivers/net/ethernet/hisilicon/hip04_mdio.c
View File

@ -1,185 +0,0 @@
/* Copyright (c) 2014 Linaro Ltd.
* Copyright (c) 2014 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/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/of_mdio.h>
#include <linux/delay.h>
#define MDIO_CMD_REG 0x0
#define MDIO_ADDR_REG 0x4
#define MDIO_WDATA_REG 0x8
#define MDIO_RDATA_REG 0xc
#define MDIO_STA_REG 0x10
#define MDIO_START BIT(14)
#define MDIO_R_VALID BIT(1)
#define MDIO_READ (BIT(12) | BIT(11) | MDIO_START)
#define MDIO_WRITE (BIT(12) | BIT(10) | MDIO_START)
struct hip04_mdio_priv {
void __iomem *base;
};
#define WAIT_TIMEOUT 10
static int hip04_mdio_wait_ready(struct mii_bus *bus)
{
struct hip04_mdio_priv *priv = bus->priv;
int i;
for (i = 0; readl_relaxed(priv->base + MDIO_CMD_REG) & MDIO_START; i++) {
if (i == WAIT_TIMEOUT)
return -ETIMEDOUT;
msleep(20);
}
return 0;
}
static int hip04_mdio_read(struct mii_bus *bus, int mii_id, int regnum)
{
struct hip04_mdio_priv *priv = bus->priv;
u32 val;
int ret;
ret = hip04_mdio_wait_ready(bus);
if (ret < 0)
goto out;
val = regnum | (mii_id << 5) | MDIO_READ;
writel_relaxed(val, priv->base + MDIO_CMD_REG);
ret = hip04_mdio_wait_ready(bus);
if (ret < 0)
goto out;
val = readl_relaxed(priv->base + MDIO_STA_REG);
if (val & MDIO_R_VALID) {
dev_err(bus->parent, "SMI bus read not valid\n");
ret = -ENODEV;
goto out;
}
val = readl_relaxed(priv->base + MDIO_RDATA_REG);
ret = val & 0xFFFF;
out:
return ret;
}
static int hip04_mdio_write(struct mii_bus *bus, int mii_id,
int regnum, u16 value)
{
struct hip04_mdio_priv *priv = bus->priv;
u32 val;
int ret;
ret = hip04_mdio_wait_ready(bus);
if (ret < 0)
goto out;
writel_relaxed(value, priv->base + MDIO_WDATA_REG);
val = regnum | (mii_id << 5) | MDIO_WRITE;
writel_relaxed(val, priv->base + MDIO_CMD_REG);
out:
return ret;
}
static int hip04_mdio_reset(struct mii_bus *bus)
{
int temp, i;
for (i = 0; i < PHY_MAX_ADDR; i++) {
hip04_mdio_write(bus, i, 22, 0);
temp = hip04_mdio_read(bus, i, MII_BMCR);
if (temp < 0)
continue;
temp |= BMCR_RESET;
if (hip04_mdio_write(bus, i, MII_BMCR, temp) < 0)
continue;
}
mdelay(500);
return 0;
}
static int hip04_mdio_probe(struct platform_device *pdev)
{
struct resource *r;
struct mii_bus *bus;
struct hip04_mdio_priv *priv;
int ret;
bus = mdiobus_alloc_size(sizeof(struct hip04_mdio_priv));
if (!bus) {
dev_err(&pdev->dev, "Cannot allocate MDIO bus\n");
return -ENOMEM;
}
bus->name = "hip04_mdio_bus";
bus->read = hip04_mdio_read;
bus->write = hip04_mdio_write;
bus->reset = hip04_mdio_reset;
snprintf(bus->id, MII_BUS_ID_SIZE, "%s-mii", dev_name(&pdev->dev));
bus->parent = &pdev->dev;
priv = bus->priv;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->base = devm_ioremap_resource(&pdev->dev, r);
if (IS_ERR(priv->base)) {
ret = PTR_ERR(priv->base);
goto out_mdio;
}
ret = of_mdiobus_register(bus, pdev->dev.of_node);
if (ret < 0) {
dev_err(&pdev->dev, "Cannot register MDIO bus (%d)\n", ret);
goto out_mdio;
}
platform_set_drvdata(pdev, bus);
return 0;
out_mdio:
mdiobus_free(bus);
return ret;
}
static int hip04_mdio_remove(struct platform_device *pdev)
{
struct mii_bus *bus = platform_get_drvdata(pdev);
mdiobus_unregister(bus);
mdiobus_free(bus);
return 0;
}
static const struct of_device_id hip04_mdio_match[] = {
{ .compatible = "hisilicon,hip04-mdio" },
{ }
};
MODULE_DEVICE_TABLE(of, hip04_mdio_match);
static struct platform_driver hip04_mdio_driver = {
.probe = hip04_mdio_probe,
.remove = hip04_mdio_remove,
.driver = {
.name = "hip04-mdio",
.of_match_table = hip04_mdio_match,
},
};
module_platform_driver(hip04_mdio_driver);
MODULE_DESCRIPTION("HISILICON P04 MDIO interface driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:hip04-mdio");

520
drivers/net/ethernet/hisilicon/hns_mdio.c Normal file
View File

@ -0,0 +1,520 @@
/*
* 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-HNS_MDIO"
#define MDIO_BUS_NAME "Hisilicon MII Bus"
#define MDIO_DRV_VERSION "1.3.0"
#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_TIMEOUT 1000000
struct hns_mdio_device {
void *vbase; /* mdio reg base address */
void *sys_vbase;
};
/* mdio reg */
#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
/* cfg phy bit map */
#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
};
/* peri subctrl reg */
#define MDIO_SC_CLK_EN 0x338
#define MDIO_SC_CLK_DIS 0x33C
#define MDIO_SC_RESET_REQ 0xA38
#define MDIO_SC_RESET_DREQ 0xA3C
#define MDIO_SC_CTRL 0x2010
#define MDIO_SC_CLK_ST 0x531C
#define MDIO_SC_RESET_ST 0x5A1C
static void mdio_write_reg(void *base, u32 reg, u32 value)
{
u8 __iomem *reg_addr = (u8 __iomem *)base;
writel_relaxed(value, reg_addr + reg);
}
#define MDIO_WRITE_REG(a, reg, value) \
mdio_write_reg((a)->vbase, (reg), (value))
static u32 mdio_read_reg(void *base, u32 reg)
{
u8 __iomem *reg_addr = (u8 __iomem *)base;
return readl_relaxed(reg_addr + 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_GET_REG_BIT(dev, reg, bit) \
mdio_get_reg_field((dev)->vbase, (reg), 0x1ull, (bit))
#define MDIO_CHECK_SET_ST 1
#define MDIO_CHECK_CLR_ST 0
static int mdio_sc_cfg_reg_write(struct hns_mdio_device *mdio_dev,
u32 cfg_reg, u32 set_val,
u32 st_reg, u32 st_msk, u8 check_st)
{
u32 time_cnt;
u32 reg_value;
mdio_write_reg((void *)mdio_dev->sys_vbase, cfg_reg, set_val);
for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) {
reg_value = mdio_read_reg((void *)mdio_dev->sys_vbase, st_reg);
reg_value &= st_msk;
if ((!!check_st) == (!!reg_value))
break;
}
if ((!!check_st) != (!!reg_value))
return -EBUSY;
return 0;
}
static int hns_mdio_wait_ready(struct mii_bus *bus)
{
struct hns_mdio_device *mdio_dev = bus->priv;
int i;
u32 cmd_reg_value = 1;
/* waitting for MDIO_COMMAND_REG 's mdio_start==0 */
/* after that can do read or write*/
for (i = 0; cmd_reg_value; i++) {
cmd_reg_value = MDIO_GET_REG_BIT(mdio_dev,
MDIO_COMMAND_REG,
MDIO_CMD_START_B);
if (i == MDIO_TIMEOUT)
return -ETIMEDOUT;
}
return 0;
}
static void hns_mdio_cmd_write(struct hns_mdio_device *mdio_dev,
u8 is_c45, u8 op, u8 phy_id, u16 cmd)
{
u32 cmd_reg_value;
u8 st = is_c45 ? MDIO_ST_CLAUSE_45 : MDIO_ST_CLAUSE_22;
cmd_reg_value = st << MDIO_CMD_ST_S;
cmd_reg_value |= op << MDIO_CMD_OP_S;
cmd_reg_value |=
(phy_id & MDIO_CMD_PRTAD_M) << MDIO_CMD_PRTAD_S;
cmd_reg_value |= (cmd & 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);
}
/**
* 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 data)
{
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);
u16 reg = (u16)(regnum & 0xffff);
u8 op;
u16 cmd_reg_cfg;
dev_dbg(&bus->dev, "mdio write %s,base is %p\n",
bus->id, mdio_dev->vbase);
dev_dbg(&bus->dev, "phy id=%d, is_c45=%d, devad=%d, reg=%#x, write data=%d\n",
phy_id, is_c45, devad, reg, data);
/* wait for ready */
ret = hns_mdio_wait_ready(bus);
if (ret) {
dev_err(&bus->dev, "MDIO bus is busy\n");
return ret;
}
if (!is_c45) {
cmd_reg_cfg = reg;
op = MDIO_C22_WRITE;
} else {
/* 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);
hns_mdio_cmd_write(mdio_dev, is_c45,
MDIO_C45_WRITE_ADDR, phy_id, devad);
/* check for read or write opt is finished */
ret = hns_mdio_wait_ready(bus);
if (ret) {
dev_err(&bus->dev, "MDIO bus is busy\n");
return ret;
}
/* config the data needed writing */
cmd_reg_cfg = devad;
op = MDIO_C45_WRITE_ADDR;
}
MDIO_SET_REG_FIELD(mdio_dev, MDIO_WDATA_REG, MDIO_WDATA_DATA_M,
MDIO_WDATA_DATA_S, data);
hns_mdio_cmd_write(mdio_dev, is_c45, op, phy_id, cmd_reg_cfg);
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);
u16 reg = (u16)(regnum & 0xffff);
struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
dev_dbg(&bus->dev, "mdio read %s,base is %p\n",
bus->id, mdio_dev->vbase);
dev_dbg(&bus->dev, "phy id=%d, is_c45=%d, devad=%d, reg=%#x!\n",
phy_id, is_c45, devad, reg);
/* Step 1: wait for ready */
ret = hns_mdio_wait_ready(bus);
if (ret) {
dev_err(&bus->dev, "MDIO bus is busy\n");
return ret;
}
if (!is_c45) {
hns_mdio_cmd_write(mdio_dev, is_c45,
MDIO_C22_READ, phy_id, reg);
} 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*/
hns_mdio_cmd_write(mdio_dev, is_c45,
MDIO_C45_WRITE_ADDR, phy_id, devad);
/* Step 3: check for read or write opt is finished */
ret = hns_mdio_wait_ready(bus);
if (ret) {
dev_err(&bus->dev, "MDIO bus is busy\n");
return ret;
}
hns_mdio_cmd_write(mdio_dev, is_c45,
MDIO_C45_WRITE_ADDR, phy_id, devad);
}
/* Step 5: waitting for MDIO_COMMAND_REG 's mdio_start==0,*/
/* check for read or write opt is finished */
ret = hns_mdio_wait_ready(bus);
if (ret) {
dev_err(&bus->dev, "MDIO bus is busy\n");
return ret;
}
reg_val = MDIO_GET_REG_BIT(mdio_dev, MDIO_STA_REG, MDIO_STATE_STA_B);
if (reg_val) {
dev_err(&bus->dev, " ERROR! MDIO Read failed!\n");
return -EBUSY;
}
/* Step 6; get out data*/
reg_val = (u16)MDIO_GET_REG_FIELD(mdio_dev, MDIO_RDATA_REG,
MDIO_RDATA_DATA_M, MDIO_RDATA_DATA_S);
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)
{
struct hns_mdio_device *mdio_dev = (struct hns_mdio_device *)bus->priv;
int ret;
if (!mdio_dev->sys_vbase) {
dev_err(&bus->dev, "mdio sys ctl reg has not maped\n");
return -ENODEV;
}
/*1. reset req, and read reset st check*/
ret = mdio_sc_cfg_reg_write(mdio_dev, MDIO_SC_RESET_REQ, 0x1,
MDIO_SC_RESET_ST, 0x1,
MDIO_CHECK_SET_ST);
if (ret) {
dev_err(&bus->dev, "MDIO reset fail\n");
return ret;
}
/*2. dis clk, and read clk st check*/
ret = mdio_sc_cfg_reg_write(mdio_dev, MDIO_SC_CLK_DIS,
0x1, MDIO_SC_CLK_ST, 0x1,
MDIO_CHECK_CLR_ST);
if (ret) {
dev_err(&bus->dev, "MDIO dis clk fail\n");
return ret;
}
/*3. reset dreq, and read reset st check*/
ret = mdio_sc_cfg_reg_write(mdio_dev, MDIO_SC_RESET_DREQ, 0x1,
MDIO_SC_RESET_ST, 0x1,
MDIO_CHECK_CLR_ST);
if (ret) {
dev_err(&bus->dev, "MDIO dis clk fail\n");
return ret;
}
/*4. en clk, and read clk st check*/
ret = mdio_sc_cfg_reg_write(mdio_dev, MDIO_SC_CLK_EN,
0x1, MDIO_SC_CLK_ST, 0x1,
MDIO_CHECK_SET_ST);
if (ret)
dev_err(&bus->dev, "MDIO en clk fail\n");
return ret;
}
/**
* 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 ret;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
mdio_dev->sys_vbase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(mdio_dev->sys_vbase)) {
ret = PTR_ERR(mdio_dev->sys_vbase);
return ret;
}
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 mii_bus *bus;
bus = platform_get_drvdata(pdev);
mdiobus_unregister(bus);
platform_set_drvdata(pdev, NULL);
return 0;
}
static const struct of_device_id hns_mdio_match[] = {
{.compatible = "hisilicon,mdio"},
{.compatible = "hisilicon,hns-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);