drivers/net/ethernet/hisilicon/hns_mdio.c - pub/scm/linux/kernel/git/ash/linux - Git at Google

 /*
  * 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/mfd/syscon.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/regmap.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 */
 	struct regmap *subctrl_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;

 	regmap_write(mdio_dev->subctrl_vbase, cfg_reg, set_val);

 	for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) {
 		regmap_read(mdio_dev->subctrl_vbase, st_reg, &reg_value);
 		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->subctrl_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;
 	}

 	mdio_dev->subctrl_vbase =
 		syscon_node_to_regmap(of_parse_phandle(np, "subctrl-vbase", 0));
 	if (IS_ERR(mdio_dev->subctrl_vbase)) {
 		dev_warn(&pdev->dev, "no syscon hisilicon,peri-c-subctrl\n");
 		mdio_dev->subctrl_vbase = NULL;
 	}
 	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);
	/*
	* 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/mfd/syscon.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/regmap.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 */
	struct regmap *subctrl_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;

	regmap_write(mdio_dev->subctrl_vbase, cfg_reg, set_val);

	for (time_cnt = MDIO_TIMEOUT; time_cnt; time_cnt--) {
	regmap_read(mdio_dev->subctrl_vbase, st_reg, &reg_value);
	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->subctrl_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;
	}

	mdio_dev->subctrl_vbase =
	syscon_node_to_regmap(of_parse_phandle(np, "subctrl-vbase", 0));
	if (IS_ERR(mdio_dev->subctrl_vbase)) {
	dev_warn(&pdev->dev, "no syscon hisilicon,peri-c-subctrl\n");
	mdio_dev->subctrl_vbase = NULL;
	}
	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);