src/kernel/linux/v4.19/drivers/net/phy/microchip.c - T800 - Gitiles

 /*
  * Copyright (C) 2015 Microchip Technology
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mii.h>
 #include <linux/ethtool.h>
 #include <linux/phy.h>
 #include <linux/microchipphy.h>
 #include <linux/delay.h>
 #include <linux/of.h>
 #include <dt-bindings/net/microchip-lan78xx.h>

 #define DRIVER_AUTHOR	"WOOJUNG HUH <woojung.huh@microchip.com>"
 #define DRIVER_DESC	"Microchip LAN88XX PHY driver"

 struct lan88xx_priv {
 	int	chip_id;
 	int	chip_rev;
 	__u32	wolopts;
 };

 static int lan88xx_read_page(struct phy_device *phydev)
 {
 	return __phy_read(phydev, LAN88XX_EXT_PAGE_ACCESS);
 }

 static int lan88xx_write_page(struct phy_device *phydev, int page)
 {
 	return __phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, page);
 }

 static int lan88xx_phy_config_intr(struct phy_device *phydev)
 {
 	int rc;

 	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
 		/* unmask all source and clear them before enable */
 		rc = phy_write(phydev, LAN88XX_INT_MASK, 0x7FFF);
 		rc = phy_read(phydev, LAN88XX_INT_STS);
 		rc = phy_write(phydev, LAN88XX_INT_MASK,
 			       LAN88XX_INT_MASK_MDINTPIN_EN_ |
 			       LAN88XX_INT_MASK_LINK_CHANGE_);
 	} else {
 		rc = phy_write(phydev, LAN88XX_INT_MASK, 0);
 	}

 	return rc < 0 ? rc : 0;
 }

 static int lan88xx_phy_ack_interrupt(struct phy_device *phydev)
 {
 	int rc = phy_read(phydev, LAN88XX_INT_STS);

 	return rc < 0 ? rc : 0;
 }

 static int lan88xx_suspend(struct phy_device *phydev)
 {
 	struct lan88xx_priv *priv = phydev->priv;

 	/* do not power down PHY when WOL is enabled */
 	if (!priv->wolopts)
 		genphy_suspend(phydev);

 	return 0;
 }

 static int lan88xx_TR_reg_set(struct phy_device *phydev, u16 regaddr,
 			      u32 data)
 {
 	int val, save_page, ret = 0;
 	u16 buf;

 	/* Save current page */
 	save_page = phy_save_page(phydev);
 	if (save_page < 0) {
 		pr_warn("Failed to get current page\n");
 		goto err;
 	}

 	/* Switch to TR page */
 	lan88xx_write_page(phydev, LAN88XX_EXT_PAGE_ACCESS_TR);

 	ret = __phy_write(phydev, LAN88XX_EXT_PAGE_TR_LOW_DATA,
 			  (data & 0xFFFF));
 	if (ret < 0) {
 		pr_warn("Failed to write TR low data\n");
 		goto err;
 	}

 	ret = __phy_write(phydev, LAN88XX_EXT_PAGE_TR_HIGH_DATA,
 			  (data & 0x00FF0000) >> 16);
 	if (ret < 0) {
 		pr_warn("Failed to write TR high data\n");
 		goto err;
 	}

 	/* Config control bits [15:13] of register */
 	buf = (regaddr & ~(0x3 << 13));/* Clr [14:13] to write data in reg */
 	buf |= 0x8000; /* Set [15] to Packet transmit */

 	ret = __phy_write(phydev, LAN88XX_EXT_PAGE_TR_CR, buf);
 	if (ret < 0) {
 		pr_warn("Failed to write data in reg\n");
 		goto err;
 	}

 	usleep_range(1000, 2000);/* Wait for Data to be written */
 	val = __phy_read(phydev, LAN88XX_EXT_PAGE_TR_CR);
 	if (!(val & 0x8000))
 		pr_warn("TR Register[0x%X] configuration failed\n", regaddr);
 err:
 	return phy_restore_page(phydev, save_page, ret);
 }

 static void lan88xx_config_TR_regs(struct phy_device *phydev)
 {
 	int err;

 	/* Get access to Channel 0x1, Node 0xF , Register 0x01.
 	 * Write 24-bit value 0x12B00A to register. Setting MrvlTrFix1000Kf,
 	 * MrvlTrFix1000Kp, MasterEnableTR bits.
 	 */
 	err = lan88xx_TR_reg_set(phydev, 0x0F82, 0x12B00A);
 	if (err < 0)
 		pr_warn("Failed to Set Register[0x0F82]\n");

 	/* Get access to Channel b'10, Node b'1101, Register 0x06.
 	 * Write 24-bit value 0xD2C46F to register. Setting SSTrKf1000Slv,
 	 * SSTrKp1000Mas bits.
 	 */
 	err = lan88xx_TR_reg_set(phydev, 0x168C, 0xD2C46F);
 	if (err < 0)
 		pr_warn("Failed to Set Register[0x168C]\n");

 	/* Get access to Channel b'10, Node b'1111, Register 0x11.
 	 * Write 24-bit value 0x620 to register. Setting rem_upd_done_thresh
 	 * bits
 	 */
 	err = lan88xx_TR_reg_set(phydev, 0x17A2, 0x620);
 	if (err < 0)
 		pr_warn("Failed to Set Register[0x17A2]\n");

 	/* Get access to Channel b'10, Node b'1101, Register 0x10.
 	 * Write 24-bit value 0xEEFFDD to register. Setting
 	 * eee_TrKp1Long_1000, eee_TrKp2Long_1000, eee_TrKp3Long_1000,
 	 * eee_TrKp1Short_1000,eee_TrKp2Short_1000, eee_TrKp3Short_1000 bits.
 	 */
 	err = lan88xx_TR_reg_set(phydev, 0x16A0, 0xEEFFDD);
 	if (err < 0)
 		pr_warn("Failed to Set Register[0x16A0]\n");

 	/* Get access to Channel b'10, Node b'1101, Register 0x13.
 	 * Write 24-bit value 0x071448 to register. Setting
 	 * slv_lpi_tr_tmr_val1, slv_lpi_tr_tmr_val2 bits.
 	 */
 	err = lan88xx_TR_reg_set(phydev, 0x16A6, 0x071448);
 	if (err < 0)
 		pr_warn("Failed to Set Register[0x16A6]\n");

 	/* Get access to Channel b'10, Node b'1101, Register 0x12.
 	 * Write 24-bit value 0x13132F to register. Setting
 	 * slv_sigdet_timer_val1, slv_sigdet_timer_val2 bits.
 	 */
 	err = lan88xx_TR_reg_set(phydev, 0x16A4, 0x13132F);
 	if (err < 0)
 		pr_warn("Failed to Set Register[0x16A4]\n");

 	/* Get access to Channel b'10, Node b'1101, Register 0x14.
 	 * Write 24-bit value 0x0 to register. Setting eee_3level_delay,
 	 * eee_TrKf_freeze_delay bits.
 	 */
 	err = lan88xx_TR_reg_set(phydev, 0x16A8, 0x0);
 	if (err < 0)
 		pr_warn("Failed to Set Register[0x16A8]\n");

 	/* Get access to Channel b'01, Node b'1111, Register 0x34.
 	 * Write 24-bit value 0x91B06C to register. Setting
 	 * FastMseSearchThreshLong1000, FastMseSearchThreshShort1000,
 	 * FastMseSearchUpdGain1000 bits.
 	 */
 	err = lan88xx_TR_reg_set(phydev, 0x0FE8, 0x91B06C);
 	if (err < 0)
 		pr_warn("Failed to Set Register[0x0FE8]\n");

 	/* Get access to Channel b'01, Node b'1111, Register 0x3E.
 	 * Write 24-bit value 0xC0A028 to register. Setting
 	 * FastMseKp2ThreshLong1000, FastMseKp2ThreshShort1000,
 	 * FastMseKp2UpdGain1000, FastMseKp2ExitEn1000 bits.
 	 */
 	err = lan88xx_TR_reg_set(phydev, 0x0FFC, 0xC0A028);
 	if (err < 0)
 		pr_warn("Failed to Set Register[0x0FFC]\n");

 	/* Get access to Channel b'01, Node b'1111, Register 0x35.
 	 * Write 24-bit value 0x041600 to register. Setting
 	 * FastMseSearchPhShNum1000, FastMseSearchClksPerPh1000,
 	 * FastMsePhChangeDelay1000 bits.
 	 */
 	err = lan88xx_TR_reg_set(phydev, 0x0FEA, 0x041600);
 	if (err < 0)
 		pr_warn("Failed to Set Register[0x0FEA]\n");

 	/* Get access to Channel b'10, Node b'1101, Register 0x03.
 	 * Write 24-bit value 0x000004 to register. Setting TrFreeze bits.
 	 */
 	err = lan88xx_TR_reg_set(phydev, 0x1686, 0x000004);
 	if (err < 0)
 		pr_warn("Failed to Set Register[0x1686]\n");
 }

 static int lan88xx_probe(struct phy_device *phydev)
 {
 	struct device *dev = &phydev->mdio.dev;
 	struct lan88xx_priv *priv;
 	u32 led_modes[4];
 	int len;

 	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	priv->wolopts = 0;

 	len = of_property_read_variable_u32_array(dev->of_node,
 						  "microchip,led-modes",
 						  led_modes,
 						  0,
 						  ARRAY_SIZE(led_modes));
 	if (len >= 0) {
 		u32 reg = 0;
 		int i;

 		for (i = 0; i < len; i++) {
 			if (led_modes[i] > 15)
 				return -EINVAL;
 			reg |= led_modes[i] << (i * 4);
 		}
 		for (; i < ARRAY_SIZE(led_modes); i++)
 			reg |= LAN78XX_FORCE_LED_OFF << (i * 4);
 		(void)phy_write(phydev, LAN78XX_PHY_LED_MODE_SELECT, reg);
 	} else if (len == -EOVERFLOW) {
 		return -EINVAL;
 	}

 	/* these values can be used to identify internal PHY */
 	priv->chip_id = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_ID);
 	priv->chip_rev = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_REV);

 	phydev->priv = priv;

 	return 0;
 }

 static void lan88xx_remove(struct phy_device *phydev)
 {
 	struct device *dev = &phydev->mdio.dev;
 	struct lan88xx_priv *priv = phydev->priv;

 	if (priv)
 		devm_kfree(dev, priv);
 }

 static int lan88xx_set_wol(struct phy_device *phydev,
 			   struct ethtool_wolinfo *wol)
 {
 	struct lan88xx_priv *priv = phydev->priv;

 	priv->wolopts = wol->wolopts;

 	return 0;
 }

 static void lan88xx_set_mdix(struct phy_device *phydev)
 {
 	int buf;
 	int val;

 	switch (phydev->mdix_ctrl) {
 	case ETH_TP_MDI:
 		val = LAN88XX_EXT_MODE_CTRL_MDI_;
 		break;
 	case ETH_TP_MDI_X:
 		val = LAN88XX_EXT_MODE_CTRL_MDI_X_;
 		break;
 	case ETH_TP_MDI_AUTO:
 		val = LAN88XX_EXT_MODE_CTRL_AUTO_MDIX_;
 		break;
 	default:
 		return;
 	}

 	phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, LAN88XX_EXT_PAGE_SPACE_1);
 	buf = phy_read(phydev, LAN88XX_EXT_MODE_CTRL);
 	buf &= ~LAN88XX_EXT_MODE_CTRL_MDIX_MASK_;
 	buf |= val;
 	phy_write(phydev, LAN88XX_EXT_MODE_CTRL, buf);
 	phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, LAN88XX_EXT_PAGE_SPACE_0);
 }

 static int lan88xx_config_init(struct phy_device *phydev)
 {
 	int val;

 	genphy_config_init(phydev);
 	/*Zerodetect delay enable */
 	val = phy_read_mmd(phydev, MDIO_MMD_PCS,
 			   PHY_ARDENNES_MMD_DEV_3_PHY_CFG);
 	val |= PHY_ARDENNES_MMD_DEV_3_PHY_CFG_ZD_DLY_EN_;

 	phy_write_mmd(phydev, MDIO_MMD_PCS, PHY_ARDENNES_MMD_DEV_3_PHY_CFG,
 		      val);

 	/* Config DSP registers */
 	lan88xx_config_TR_regs(phydev);

 	return 0;
 }

 static int lan88xx_config_aneg(struct phy_device *phydev)
 {
 	lan88xx_set_mdix(phydev);

 	return genphy_config_aneg(phydev);
 }

 static struct phy_driver microchip_phy_driver[] = {
 {
 	.phy_id		= 0x0007c130,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "Microchip LAN88xx",

 	.features	= PHY_GBIT_FEATURES,
 	.flags		= PHY_HAS_INTERRUPT,

 	.probe		= lan88xx_probe,
 	.remove		= lan88xx_remove,

 	.config_init	= lan88xx_config_init,
 	.config_aneg	= lan88xx_config_aneg,

 	.ack_interrupt	= lan88xx_phy_ack_interrupt,
 	.config_intr	= lan88xx_phy_config_intr,

 	.suspend	= lan88xx_suspend,
 	.resume		= genphy_resume,
 	.set_wol	= lan88xx_set_wol,
 	.read_page	= lan88xx_read_page,
 	.write_page	= lan88xx_write_page,
 } };

 module_phy_driver(microchip_phy_driver);

 static struct mdio_device_id __maybe_unused microchip_tbl[] = {
 	{ 0x0007c130, 0xfffffff0 },
 	{ }
 };

 MODULE_DEVICE_TABLE(mdio, microchip_tbl);

 MODULE_AUTHOR(DRIVER_AUTHOR);
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");
	/*
	* Copyright (C) 2015 Microchip Technology
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, see <http://www.gnu.org/licenses/>.
	*/
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/mii.h>
	#include <linux/ethtool.h>
	#include <linux/phy.h>
	#include <linux/microchipphy.h>
	#include <linux/delay.h>
	#include <linux/of.h>
	#include <dt-bindings/net/microchip-lan78xx.h>

	#define DRIVER_AUTHOR "WOOJUNG HUH <woojung.huh@microchip.com>"
	#define DRIVER_DESC "Microchip LAN88XX PHY driver"

	struct lan88xx_priv {
	int chip_id;
	int chip_rev;
	__u32 wolopts;
	};

	static int lan88xx_read_page(struct phy_device *phydev)
	{
	return __phy_read(phydev, LAN88XX_EXT_PAGE_ACCESS);
	}

	static int lan88xx_write_page(struct phy_device *phydev, int page)
	{
	return __phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, page);
	}

	static int lan88xx_phy_config_intr(struct phy_device *phydev)
	{
	int rc;

	if (phydev->interrupts == PHY_INTERRUPT_ENABLED) {
	/* unmask all source and clear them before enable */
	rc = phy_write(phydev, LAN88XX_INT_MASK, 0x7FFF);
	rc = phy_read(phydev, LAN88XX_INT_STS);
	rc = phy_write(phydev, LAN88XX_INT_MASK,
	LAN88XX_INT_MASK_MDINTPIN_EN_ \|
	LAN88XX_INT_MASK_LINK_CHANGE_);
	} else {
	rc = phy_write(phydev, LAN88XX_INT_MASK, 0);
	}

	return rc < 0 ? rc : 0;
	}

	static int lan88xx_phy_ack_interrupt(struct phy_device *phydev)
	{
	int rc = phy_read(phydev, LAN88XX_INT_STS);

	return rc < 0 ? rc : 0;
	}

	static int lan88xx_suspend(struct phy_device *phydev)
	{
	struct lan88xx_priv *priv = phydev->priv;

	/* do not power down PHY when WOL is enabled */
	if (!priv->wolopts)
	genphy_suspend(phydev);

	return 0;
	}

	static int lan88xx_TR_reg_set(struct phy_device *phydev, u16 regaddr,
	u32 data)
	{
	int val, save_page, ret = 0;
	u16 buf;

	/* Save current page */
	save_page = phy_save_page(phydev);
	if (save_page < 0) {
	pr_warn("Failed to get current page\n");
	goto err;
	}

	/* Switch to TR page */
	lan88xx_write_page(phydev, LAN88XX_EXT_PAGE_ACCESS_TR);

	ret = __phy_write(phydev, LAN88XX_EXT_PAGE_TR_LOW_DATA,
	(data & 0xFFFF));
	if (ret < 0) {
	pr_warn("Failed to write TR low data\n");
	goto err;
	}

	ret = __phy_write(phydev, LAN88XX_EXT_PAGE_TR_HIGH_DATA,
	(data & 0x00FF0000) >> 16);
	if (ret < 0) {
	pr_warn("Failed to write TR high data\n");
	goto err;
	}

	/* Config control bits [15:13] of register */
	buf = (regaddr & ~(0x3 << 13));/* Clr [14:13] to write data in reg */
	buf \|= 0x8000; /* Set [15] to Packet transmit */

	ret = __phy_write(phydev, LAN88XX_EXT_PAGE_TR_CR, buf);
	if (ret < 0) {
	pr_warn("Failed to write data in reg\n");
	goto err;
	}

	usleep_range(1000, 2000);/* Wait for Data to be written */
	val = __phy_read(phydev, LAN88XX_EXT_PAGE_TR_CR);
	if (!(val & 0x8000))
	pr_warn("TR Register[0x%X] configuration failed\n", regaddr);
	err:
	return phy_restore_page(phydev, save_page, ret);
	}

	static void lan88xx_config_TR_regs(struct phy_device *phydev)
	{
	int err;

	/* Get access to Channel 0x1, Node 0xF , Register 0x01.
	* Write 24-bit value 0x12B00A to register. Setting MrvlTrFix1000Kf,
	* MrvlTrFix1000Kp, MasterEnableTR bits.
	*/
	err = lan88xx_TR_reg_set(phydev, 0x0F82, 0x12B00A);
	if (err < 0)
	pr_warn("Failed to Set Register[0x0F82]\n");

	/* Get access to Channel b'10, Node b'1101, Register 0x06.
	* Write 24-bit value 0xD2C46F to register. Setting SSTrKf1000Slv,
	* SSTrKp1000Mas bits.
	*/
	err = lan88xx_TR_reg_set(phydev, 0x168C, 0xD2C46F);
	if (err < 0)
	pr_warn("Failed to Set Register[0x168C]\n");

	/* Get access to Channel b'10, Node b'1111, Register 0x11.
	* Write 24-bit value 0x620 to register. Setting rem_upd_done_thresh
	* bits
	*/
	err = lan88xx_TR_reg_set(phydev, 0x17A2, 0x620);
	if (err < 0)
	pr_warn("Failed to Set Register[0x17A2]\n");

	/* Get access to Channel b'10, Node b'1101, Register 0x10.
	* Write 24-bit value 0xEEFFDD to register. Setting
	* eee_TrKp1Long_1000, eee_TrKp2Long_1000, eee_TrKp3Long_1000,
	* eee_TrKp1Short_1000,eee_TrKp2Short_1000, eee_TrKp3Short_1000 bits.
	*/
	err = lan88xx_TR_reg_set(phydev, 0x16A0, 0xEEFFDD);
	if (err < 0)
	pr_warn("Failed to Set Register[0x16A0]\n");

	/* Get access to Channel b'10, Node b'1101, Register 0x13.
	* Write 24-bit value 0x071448 to register. Setting
	* slv_lpi_tr_tmr_val1, slv_lpi_tr_tmr_val2 bits.
	*/
	err = lan88xx_TR_reg_set(phydev, 0x16A6, 0x071448);
	if (err < 0)
	pr_warn("Failed to Set Register[0x16A6]\n");

	/* Get access to Channel b'10, Node b'1101, Register 0x12.
	* Write 24-bit value 0x13132F to register. Setting
	* slv_sigdet_timer_val1, slv_sigdet_timer_val2 bits.
	*/
	err = lan88xx_TR_reg_set(phydev, 0x16A4, 0x13132F);
	if (err < 0)
	pr_warn("Failed to Set Register[0x16A4]\n");

	/* Get access to Channel b'10, Node b'1101, Register 0x14.
	* Write 24-bit value 0x0 to register. Setting eee_3level_delay,
	* eee_TrKf_freeze_delay bits.
	*/
	err = lan88xx_TR_reg_set(phydev, 0x16A8, 0x0);
	if (err < 0)
	pr_warn("Failed to Set Register[0x16A8]\n");

	/* Get access to Channel b'01, Node b'1111, Register 0x34.
	* Write 24-bit value 0x91B06C to register. Setting
	* FastMseSearchThreshLong1000, FastMseSearchThreshShort1000,
	* FastMseSearchUpdGain1000 bits.
	*/
	err = lan88xx_TR_reg_set(phydev, 0x0FE8, 0x91B06C);
	if (err < 0)
	pr_warn("Failed to Set Register[0x0FE8]\n");

	/* Get access to Channel b'01, Node b'1111, Register 0x3E.
	* Write 24-bit value 0xC0A028 to register. Setting
	* FastMseKp2ThreshLong1000, FastMseKp2ThreshShort1000,
	* FastMseKp2UpdGain1000, FastMseKp2ExitEn1000 bits.
	*/
	err = lan88xx_TR_reg_set(phydev, 0x0FFC, 0xC0A028);
	if (err < 0)
	pr_warn("Failed to Set Register[0x0FFC]\n");

	/* Get access to Channel b'01, Node b'1111, Register 0x35.
	* Write 24-bit value 0x041600 to register. Setting
	* FastMseSearchPhShNum1000, FastMseSearchClksPerPh1000,
	* FastMsePhChangeDelay1000 bits.
	*/
	err = lan88xx_TR_reg_set(phydev, 0x0FEA, 0x041600);
	if (err < 0)
	pr_warn("Failed to Set Register[0x0FEA]\n");

	/* Get access to Channel b'10, Node b'1101, Register 0x03.
	* Write 24-bit value 0x000004 to register. Setting TrFreeze bits.
	*/
	err = lan88xx_TR_reg_set(phydev, 0x1686, 0x000004);
	if (err < 0)
	pr_warn("Failed to Set Register[0x1686]\n");
	}

	static int lan88xx_probe(struct phy_device *phydev)
	{
	struct device *dev = &phydev->mdio.dev;
	struct lan88xx_priv *priv;
	u32 led_modes[4];
	int len;

	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	priv->wolopts = 0;

	len = of_property_read_variable_u32_array(dev->of_node,
	"microchip,led-modes",
	led_modes,
	0,
	ARRAY_SIZE(led_modes));
	if (len >= 0) {
	u32 reg = 0;
	int i;

	for (i = 0; i < len; i++) {
	if (led_modes[i] > 15)
	return -EINVAL;
	reg \|= led_modes[i] << (i * 4);
	}
	for (; i < ARRAY_SIZE(led_modes); i++)
	reg \|= LAN78XX_FORCE_LED_OFF << (i * 4);
	(void)phy_write(phydev, LAN78XX_PHY_LED_MODE_SELECT, reg);
	} else if (len == -EOVERFLOW) {
	return -EINVAL;
	}

	/* these values can be used to identify internal PHY */
	priv->chip_id = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_ID);
	priv->chip_rev = phy_read_mmd(phydev, 3, LAN88XX_MMD3_CHIP_REV);

	phydev->priv = priv;

	return 0;
	}

	static void lan88xx_remove(struct phy_device *phydev)
	{
	struct device *dev = &phydev->mdio.dev;
	struct lan88xx_priv *priv = phydev->priv;

	if (priv)
	devm_kfree(dev, priv);
	}

	static int lan88xx_set_wol(struct phy_device *phydev,
	struct ethtool_wolinfo *wol)
	{
	struct lan88xx_priv *priv = phydev->priv;

	priv->wolopts = wol->wolopts;

	return 0;
	}

	static void lan88xx_set_mdix(struct phy_device *phydev)
	{
	int buf;
	int val;

	switch (phydev->mdix_ctrl) {
	case ETH_TP_MDI:
	val = LAN88XX_EXT_MODE_CTRL_MDI_;
	break;
	case ETH_TP_MDI_X:
	val = LAN88XX_EXT_MODE_CTRL_MDI_X_;
	break;
	case ETH_TP_MDI_AUTO:
	val = LAN88XX_EXT_MODE_CTRL_AUTO_MDIX_;
	break;
	default:
	return;
	}

	phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, LAN88XX_EXT_PAGE_SPACE_1);
	buf = phy_read(phydev, LAN88XX_EXT_MODE_CTRL);
	buf &= ~LAN88XX_EXT_MODE_CTRL_MDIX_MASK_;
	buf \|= val;
	phy_write(phydev, LAN88XX_EXT_MODE_CTRL, buf);
	phy_write(phydev, LAN88XX_EXT_PAGE_ACCESS, LAN88XX_EXT_PAGE_SPACE_0);
	}

	static int lan88xx_config_init(struct phy_device *phydev)
	{
	int val;

	genphy_config_init(phydev);
	/Zerodetect delay enable /
	val = phy_read_mmd(phydev, MDIO_MMD_PCS,
	PHY_ARDENNES_MMD_DEV_3_PHY_CFG);
	val \|= PHY_ARDENNES_MMD_DEV_3_PHY_CFG_ZD_DLY_EN_;

	phy_write_mmd(phydev, MDIO_MMD_PCS, PHY_ARDENNES_MMD_DEV_3_PHY_CFG,
	val);

	/* Config DSP registers */
	lan88xx_config_TR_regs(phydev);

	return 0;
	}

	static int lan88xx_config_aneg(struct phy_device *phydev)
	{
	lan88xx_set_mdix(phydev);

	return genphy_config_aneg(phydev);
	}

	static struct phy_driver microchip_phy_driver[] = {
	{
	.phy_id = 0x0007c130,
	.phy_id_mask = 0xfffffff0,
	.name = "Microchip LAN88xx",

	.features = PHY_GBIT_FEATURES,
	.flags = PHY_HAS_INTERRUPT,

	.probe = lan88xx_probe,
	.remove = lan88xx_remove,

	.config_init = lan88xx_config_init,
	.config_aneg = lan88xx_config_aneg,

	.ack_interrupt = lan88xx_phy_ack_interrupt,
	.config_intr = lan88xx_phy_config_intr,

	.suspend = lan88xx_suspend,
	.resume = genphy_resume,
	.set_wol = lan88xx_set_wol,
	.read_page = lan88xx_read_page,
	.write_page = lan88xx_write_page,
	} };

	module_phy_driver(microchip_phy_driver);

	static struct mdio_device_id __maybe_unused microchip_tbl[] = {
	{ 0x0007c130, 0xfffffff0 },
	{ }
	};

	MODULE_DEVICE_TABLE(mdio, microchip_tbl);

	MODULE_AUTHOR(DRIVER_AUTHOR);
	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_LICENSE("GPL");