drivers/net/phy/bcm7xxx.c - kernel/msm-4.19 - Gitiles

 /*
  * Broadcom BCM7xxx internal transceivers support.
  *
  * Copyright (C) 2014, Broadcom Corporation
  *
  * 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/phy.h>
 #include <linux/delay.h>
 #include <linux/bitops.h>
 #include <linux/brcmphy.h>
 #include <linux/mdio.h>

 /* Broadcom BCM7xxx internal PHY registers */
 #define MII_BCM7XXX_CHANNEL_WIDTH	0x2000

 /* 40nm only register definitions */
 #define MII_BCM7XXX_100TX_AUX_CTL	0x10
 #define MII_BCM7XXX_100TX_FALSE_CAR	0x13
 #define MII_BCM7XXX_100TX_DISC		0x14
 #define MII_BCM7XXX_AUX_MODE		0x1d
 #define  MII_BCM7XX_64CLK_MDIO		BIT(12)
 #define MII_BCM7XXX_CORE_BASE1E		0x1e
 #define MII_BCM7XXX_TEST		0x1f
 #define  MII_BCM7XXX_SHD_MODE_2		BIT(2)

 /* 28nm only register definitions */
 #define MISC_ADDR(base, channel)	base, channel

 #define DSP_TAP10			MISC_ADDR(0x0a, 0)
 #define PLL_PLLCTRL_1			MISC_ADDR(0x32, 1)
 #define PLL_PLLCTRL_2			MISC_ADDR(0x32, 2)
 #define PLL_PLLCTRL_4			MISC_ADDR(0x33, 0)

 #define AFE_RXCONFIG_0			MISC_ADDR(0x38, 0)
 #define AFE_RXCONFIG_1			MISC_ADDR(0x38, 1)
 #define AFE_RX_LP_COUNTER		MISC_ADDR(0x38, 3)
 #define AFE_TX_CONFIG			MISC_ADDR(0x39, 0)
 #define AFE_HPF_TRIM_OTHERS		MISC_ADDR(0x3a, 0)

 #define CORE_EXPB0			0xb0

 static int bcm7445_config_init(struct phy_device *phydev)
 {
 	int ret;
 	const struct bcm7445_regs {
 		int reg;
 		u16 value;
 	} bcm7445_regs_cfg[] = {
 		/* increases ADC latency by 24ns */
 		{ MII_BCM54XX_EXP_SEL, 0x0038 },
 		{ MII_BCM54XX_EXP_DATA, 0xAB95 },
 		/* increases internal 1V LDO voltage by 5% */
 		{ MII_BCM54XX_EXP_SEL, 0x2038 },
 		{ MII_BCM54XX_EXP_DATA, 0xBB22 },
 		/* reduce RX low pass filter corner frequency */
 		{ MII_BCM54XX_EXP_SEL, 0x6038 },
 		{ MII_BCM54XX_EXP_DATA, 0xFFC5 },
 		/* reduce RX high pass filter corner frequency */
 		{ MII_BCM54XX_EXP_SEL, 0x003a },
 		{ MII_BCM54XX_EXP_DATA, 0x2002 },
 	};
 	unsigned int i;

 	for (i = 0; i < ARRAY_SIZE(bcm7445_regs_cfg); i++) {
 		ret = phy_write(phydev,
 				bcm7445_regs_cfg[i].reg,
 				bcm7445_regs_cfg[i].value);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 static void phy_write_exp(struct phy_device *phydev,
 					u16 reg, u16 value)
 {
 	phy_write(phydev, MII_BCM54XX_EXP_SEL, MII_BCM54XX_EXP_SEL_ER | reg);
 	phy_write(phydev, MII_BCM54XX_EXP_DATA, value);
 }

 static void phy_write_misc(struct phy_device *phydev,
 					u16 reg, u16 chl, u16 value)
 {
 	int tmp;

 	phy_write(phydev, MII_BCM54XX_AUX_CTL, MII_BCM54XX_AUXCTL_SHDWSEL_MISC);

 	tmp = phy_read(phydev, MII_BCM54XX_AUX_CTL);
 	tmp |= MII_BCM54XX_AUXCTL_ACTL_SMDSP_ENA;
 	phy_write(phydev, MII_BCM54XX_AUX_CTL, tmp);

 	tmp = (chl * MII_BCM7XXX_CHANNEL_WIDTH) | reg;
 	phy_write(phydev, MII_BCM54XX_EXP_SEL, tmp);

 	phy_write(phydev, MII_BCM54XX_EXP_DATA, value);
 }

 static int bcm7xxx_28nm_afe_config_init(struct phy_device *phydev)
 {
 	/* Increase VCO range to prevent unlocking problem of PLL at low
 	 * temp
 	 */
 	phy_write_misc(phydev, PLL_PLLCTRL_1, 0x0048);

 	/* Change Ki to 011 */
 	phy_write_misc(phydev, PLL_PLLCTRL_2, 0x021b);

 	/* Disable loading of TVCO buffer to bandgap, set bandgap trim
 	 * to 111
 	 */
 	phy_write_misc(phydev, PLL_PLLCTRL_4, 0x0e20);

 	/* Adjust bias current trim by -3 */
 	phy_write_misc(phydev, DSP_TAP10, 0x690b);

 	/* Switch to CORE_BASE1E */
 	phy_write(phydev, MII_BCM7XXX_CORE_BASE1E, 0xd);

 	/* Reset R_CAL/RC_CAL Engine */
 	phy_write_exp(phydev, CORE_EXPB0, 0x0010);

 	/* Disable Reset R_CAL/RC_CAL Engine */
 	phy_write_exp(phydev, CORE_EXPB0, 0x0000);

 	/* write AFE_RXCONFIG_0 */
 	phy_write_misc(phydev, AFE_RXCONFIG_0, 0xeb19);

 	/* write AFE_RXCONFIG_1 */
 	phy_write_misc(phydev, AFE_RXCONFIG_1, 0x9a3f);

 	/* write AFE_RX_LP_COUNTER */
 	phy_write_misc(phydev, AFE_RX_LP_COUNTER, 0x7fc0);

 	/* write AFE_HPF_TRIM_OTHERS */
 	phy_write_misc(phydev, AFE_HPF_TRIM_OTHERS, 0x000b);

 	/* write AFTE_TX_CONFIG */
 	phy_write_misc(phydev, AFE_TX_CONFIG, 0x0800);

 	return 0;
 }

 static int bcm7xxx_apd_enable(struct phy_device *phydev)
 {
 	int val;

 	/* Enable powering down of the DLL during auto-power down */
 	val = bcm54xx_shadow_read(phydev, BCM54XX_SHD_SCR3);
 	if (val < 0)
 		return val;

 	val |= BCM54XX_SHD_SCR3_DLLAPD_DIS;
 	bcm54xx_shadow_write(phydev, BCM54XX_SHD_SCR3, val);

 	/* Enable auto-power down */
 	val = bcm54xx_shadow_read(phydev, BCM54XX_SHD_APD);
 	if (val < 0)
 		return val;

 	val |= BCM54XX_SHD_APD_EN;
 	return bcm54xx_shadow_write(phydev, BCM54XX_SHD_APD, val);
 }

 static int bcm7xxx_eee_enable(struct phy_device *phydev)
 {
 	int val;

 	val = phy_read_mmd_indirect(phydev, BRCM_CL45VEN_EEE_CONTROL,
 				    MDIO_MMD_AN, phydev->addr);
 	if (val < 0)
 		return val;

 	/* Enable general EEE feature at the PHY level */
 	val |= LPI_FEATURE_EN | LPI_FEATURE_EN_DIG1000X;

 	phy_write_mmd_indirect(phydev, BRCM_CL45VEN_EEE_CONTROL,
 			       MDIO_MMD_AN, phydev->addr, val);

 	/* Advertise supported modes */
 	val = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
 				    MDIO_MMD_AN, phydev->addr);

 	val |= (MDIO_AN_EEE_ADV_100TX | MDIO_AN_EEE_ADV_1000T);
 	phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
 			       MDIO_MMD_AN, phydev->addr, val);

 	return 0;
 }

 static int bcm7xxx_28nm_config_init(struct phy_device *phydev)
 {
 	u8 rev = PHY_BRCM_7XXX_REV(phydev->dev_flags);
 	u8 patch = PHY_BRCM_7XXX_PATCH(phydev->dev_flags);
 	int ret = 0;

 	dev_info(&phydev->dev, "PHY revision: 0x%02x, patch: %d\n", rev, patch);

 	switch (rev) {
 	case 0xa0:
 	case 0xb0:
 		ret = bcm7445_config_init(phydev);
 		break;
 	default:
 		ret = bcm7xxx_28nm_afe_config_init(phydev);
 		break;
 	}

 	if (ret)
 		return ret;

 	ret = bcm7xxx_eee_enable(phydev);
 	if (ret)
 		return ret;

 	return bcm7xxx_apd_enable(phydev);
 }

 static int bcm7xxx_28nm_resume(struct phy_device *phydev)
 {
 	int ret;

 	/* Re-apply workarounds coming out suspend/resume */
 	ret = bcm7xxx_28nm_config_init(phydev);
 	if (ret)
 		return ret;

 	/* 28nm Gigabit PHYs come out of reset without any half-duplex
 	 * or "hub" compliant advertised mode, fix that. This does not
 	 * cause any problems with the PHY library since genphy_config_aneg()
 	 * gracefully handles auto-negotiated and forced modes.
 	 */
 	return genphy_config_aneg(phydev);
 }

 static int phy_set_clr_bits(struct phy_device *dev, int location,
 					int set_mask, int clr_mask)
 {
 	int v, ret;

 	v = phy_read(dev, location);
 	if (v < 0)
 		return v;

 	v &= ~clr_mask;
 	v |= set_mask;

 	ret = phy_write(dev, location, v);
 	if (ret < 0)
 		return ret;

 	return v;
 }

 static int bcm7xxx_config_init(struct phy_device *phydev)
 {
 	int ret;

 	/* Enable 64 clock MDIO */
 	phy_write(phydev, MII_BCM7XXX_AUX_MODE, MII_BCM7XX_64CLK_MDIO);
 	phy_read(phydev, MII_BCM7XXX_AUX_MODE);

 	/* Workaround only required for 100Mbits/sec capable PHYs */
 	if (phydev->supported & PHY_GBIT_FEATURES)
 		return 0;

 	/* set shadow mode 2 */
 	ret = phy_set_clr_bits(phydev, MII_BCM7XXX_TEST,
 			MII_BCM7XXX_SHD_MODE_2, MII_BCM7XXX_SHD_MODE_2);
 	if (ret < 0)
 		return ret;

 	/* set iddq_clkbias */
 	phy_write(phydev, MII_BCM7XXX_100TX_DISC, 0x0F00);
 	udelay(10);

 	/* reset iddq_clkbias */
 	phy_write(phydev, MII_BCM7XXX_100TX_DISC, 0x0C00);

 	phy_write(phydev, MII_BCM7XXX_100TX_FALSE_CAR, 0x7555);

 	/* reset shadow mode 2 */
 	ret = phy_set_clr_bits(phydev, MII_BCM7XXX_TEST, MII_BCM7XXX_SHD_MODE_2, 0);
 	if (ret < 0)
 		return ret;

 	return 0;
 }

 /* Workaround for putting the PHY in IDDQ mode, required
  * for all BCM7XXX 40nm and 65nm PHYs
  */
 static int bcm7xxx_suspend(struct phy_device *phydev)
 {
 	int ret;
 	const struct bcm7xxx_regs {
 		int reg;
 		u16 value;
 	} bcm7xxx_suspend_cfg[] = {
 		{ MII_BCM7XXX_TEST, 0x008b },
 		{ MII_BCM7XXX_100TX_AUX_CTL, 0x01c0 },
 		{ MII_BCM7XXX_100TX_DISC, 0x7000 },
 		{ MII_BCM7XXX_TEST, 0x000f },
 		{ MII_BCM7XXX_100TX_AUX_CTL, 0x20d0 },
 		{ MII_BCM7XXX_TEST, 0x000b },
 	};
 	unsigned int i;

 	for (i = 0; i < ARRAY_SIZE(bcm7xxx_suspend_cfg); i++) {
 		ret = phy_write(phydev,
 				bcm7xxx_suspend_cfg[i].reg,
 				bcm7xxx_suspend_cfg[i].value);
 		if (ret)
 			return ret;
 	}

 	return 0;
 }

 static int bcm7xxx_dummy_config_init(struct phy_device *phydev)
 {
 	return 0;
 }

 #define BCM7XXX_28NM_GPHY(_oui, _name)					\
 {									\
 	.phy_id		= (_oui),					\
 	.phy_id_mask	= 0xfffffff0,					\
 	.name		= _name,					\
 	.features	= PHY_GBIT_FEATURES |				\
 			  SUPPORTED_Pause | SUPPORTED_Asym_Pause,	\
 	.flags		= PHY_IS_INTERNAL,				\
 	.config_init	= bcm7xxx_28nm_afe_config_init,			\
 	.config_aneg	= genphy_config_aneg,				\
 	.read_status	= genphy_read_status,				\
 	.resume		= bcm7xxx_28nm_resume,				\
 	.driver		= { .owner = THIS_MODULE },			\
 }

 static struct phy_driver bcm7xxx_driver[] = {
 	BCM7XXX_28NM_GPHY(PHY_ID_BCM7250, "Broadcom BCM7250"),
 	BCM7XXX_28NM_GPHY(PHY_ID_BCM7364, "Broadcom BCM7364"),
 	BCM7XXX_28NM_GPHY(PHY_ID_BCM7366, "Broadcom BCM7366"),
 	BCM7XXX_28NM_GPHY(PHY_ID_BCM7439, "Broadcom BCM7439"),
 	BCM7XXX_28NM_GPHY(PHY_ID_BCM7445, "Broadcom BCM7445"),
 {
 	.phy_id		= PHY_BCM_OUI_4,
 	.phy_id_mask	= 0xffff0000,
 	.name		= "Broadcom BCM7XXX 40nm",
 	.features	= PHY_GBIT_FEATURES |
 			  SUPPORTED_Pause | SUPPORTED_Asym_Pause,
 	.flags		= PHY_IS_INTERNAL,
 	.config_init	= bcm7xxx_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.suspend	= bcm7xxx_suspend,
 	.resume		= bcm7xxx_config_init,
 	.driver		= { .owner = THIS_MODULE },
 }, {
 	.phy_id		= PHY_BCM_OUI_5,
 	.phy_id_mask	= 0xffffff00,
 	.name		= "Broadcom BCM7XXX 65nm",
 	.features	= PHY_BASIC_FEATURES |
 			  SUPPORTED_Pause | SUPPORTED_Asym_Pause,
 	.flags		= PHY_IS_INTERNAL,
 	.config_init	= bcm7xxx_dummy_config_init,
 	.config_aneg	= genphy_config_aneg,
 	.read_status	= genphy_read_status,
 	.suspend	= bcm7xxx_suspend,
 	.resume		= bcm7xxx_config_init,
 	.driver		= { .owner = THIS_MODULE },
 } };

 static struct mdio_device_id __maybe_unused bcm7xxx_tbl[] = {
 	{ PHY_ID_BCM7250, 0xfffffff0, },
 	{ PHY_ID_BCM7364, 0xfffffff0, },
 	{ PHY_ID_BCM7366, 0xfffffff0, },
 	{ PHY_ID_BCM7439, 0xfffffff0, },
 	{ PHY_ID_BCM7445, 0xfffffff0, },
 	{ PHY_BCM_OUI_4, 0xffff0000 },
 	{ PHY_BCM_OUI_5, 0xffffff00 },
 	{ }
 };

 static int __init bcm7xxx_phy_init(void)
 {
 	return phy_drivers_register(bcm7xxx_driver,
 			ARRAY_SIZE(bcm7xxx_driver));
 }

 static void __exit bcm7xxx_phy_exit(void)
 {
 	phy_drivers_unregister(bcm7xxx_driver,
 			ARRAY_SIZE(bcm7xxx_driver));
 }

 module_init(bcm7xxx_phy_init);
 module_exit(bcm7xxx_phy_exit);

 MODULE_DEVICE_TABLE(mdio, bcm7xxx_tbl);

 MODULE_DESCRIPTION("Broadcom BCM7xxx internal PHY driver");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Broadcom Corporation");
	/*
	* Broadcom BCM7xxx internal transceivers support.
	*
	* Copyright (C) 2014, Broadcom Corporation
	*
	* 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/phy.h>
	#include <linux/delay.h>
	#include <linux/bitops.h>
	#include <linux/brcmphy.h>
	#include <linux/mdio.h>

	/* Broadcom BCM7xxx internal PHY registers */
	#define MII_BCM7XXX_CHANNEL_WIDTH 0x2000

	/* 40nm only register definitions */
	#define MII_BCM7XXX_100TX_AUX_CTL 0x10
	#define MII_BCM7XXX_100TX_FALSE_CAR 0x13
	#define MII_BCM7XXX_100TX_DISC 0x14
	#define MII_BCM7XXX_AUX_MODE 0x1d
	#define MII_BCM7XX_64CLK_MDIO BIT(12)
	#define MII_BCM7XXX_CORE_BASE1E 0x1e
	#define MII_BCM7XXX_TEST 0x1f
	#define MII_BCM7XXX_SHD_MODE_2 BIT(2)

	/* 28nm only register definitions */
	#define MISC_ADDR(base, channel) base, channel

	#define DSP_TAP10 MISC_ADDR(0x0a, 0)
	#define PLL_PLLCTRL_1 MISC_ADDR(0x32, 1)
	#define PLL_PLLCTRL_2 MISC_ADDR(0x32, 2)
	#define PLL_PLLCTRL_4 MISC_ADDR(0x33, 0)

	#define AFE_RXCONFIG_0 MISC_ADDR(0x38, 0)
	#define AFE_RXCONFIG_1 MISC_ADDR(0x38, 1)
	#define AFE_RX_LP_COUNTER MISC_ADDR(0x38, 3)
	#define AFE_TX_CONFIG MISC_ADDR(0x39, 0)
	#define AFE_HPF_TRIM_OTHERS MISC_ADDR(0x3a, 0)

	#define CORE_EXPB0 0xb0

	static int bcm7445_config_init(struct phy_device *phydev)
	{
	int ret;
	const struct bcm7445_regs {
	int reg;
	u16 value;
	} bcm7445_regs_cfg[] = {
	/* increases ADC latency by 24ns */
	{ MII_BCM54XX_EXP_SEL, 0x0038 },
	{ MII_BCM54XX_EXP_DATA, 0xAB95 },
	/* increases internal 1V LDO voltage by 5% */
	{ MII_BCM54XX_EXP_SEL, 0x2038 },
	{ MII_BCM54XX_EXP_DATA, 0xBB22 },
	/* reduce RX low pass filter corner frequency */
	{ MII_BCM54XX_EXP_SEL, 0x6038 },
	{ MII_BCM54XX_EXP_DATA, 0xFFC5 },
	/* reduce RX high pass filter corner frequency */
	{ MII_BCM54XX_EXP_SEL, 0x003a },
	{ MII_BCM54XX_EXP_DATA, 0x2002 },
	};
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(bcm7445_regs_cfg); i++) {
	ret = phy_write(phydev,
	bcm7445_regs_cfg[i].reg,
	bcm7445_regs_cfg[i].value);
	if (ret)
	return ret;
	}

	return 0;
	}

	static void phy_write_exp(struct phy_device *phydev,
	u16 reg, u16 value)
	{
	phy_write(phydev, MII_BCM54XX_EXP_SEL, MII_BCM54XX_EXP_SEL_ER \| reg);
	phy_write(phydev, MII_BCM54XX_EXP_DATA, value);
	}

	static void phy_write_misc(struct phy_device *phydev,
	u16 reg, u16 chl, u16 value)
	{
	int tmp;

	phy_write(phydev, MII_BCM54XX_AUX_CTL, MII_BCM54XX_AUXCTL_SHDWSEL_MISC);

	tmp = phy_read(phydev, MII_BCM54XX_AUX_CTL);
	tmp \|= MII_BCM54XX_AUXCTL_ACTL_SMDSP_ENA;
	phy_write(phydev, MII_BCM54XX_AUX_CTL, tmp);

	tmp = (chl * MII_BCM7XXX_CHANNEL_WIDTH) \| reg;
	phy_write(phydev, MII_BCM54XX_EXP_SEL, tmp);

	phy_write(phydev, MII_BCM54XX_EXP_DATA, value);
	}

	static int bcm7xxx_28nm_afe_config_init(struct phy_device *phydev)
	{
	/* Increase VCO range to prevent unlocking problem of PLL at low
	* temp
	*/
	phy_write_misc(phydev, PLL_PLLCTRL_1, 0x0048);

	/* Change Ki to 011 */
	phy_write_misc(phydev, PLL_PLLCTRL_2, 0x021b);

	/* Disable loading of TVCO buffer to bandgap, set bandgap trim
	* to 111
	*/
	phy_write_misc(phydev, PLL_PLLCTRL_4, 0x0e20);

	/* Adjust bias current trim by -3 */
	phy_write_misc(phydev, DSP_TAP10, 0x690b);

	/* Switch to CORE_BASE1E */
	phy_write(phydev, MII_BCM7XXX_CORE_BASE1E, 0xd);

	/* Reset R_CAL/RC_CAL Engine */
	phy_write_exp(phydev, CORE_EXPB0, 0x0010);

	/* Disable Reset R_CAL/RC_CAL Engine */
	phy_write_exp(phydev, CORE_EXPB0, 0x0000);

	/* write AFE_RXCONFIG_0 */
	phy_write_misc(phydev, AFE_RXCONFIG_0, 0xeb19);

	/* write AFE_RXCONFIG_1 */
	phy_write_misc(phydev, AFE_RXCONFIG_1, 0x9a3f);

	/* write AFE_RX_LP_COUNTER */
	phy_write_misc(phydev, AFE_RX_LP_COUNTER, 0x7fc0);

	/* write AFE_HPF_TRIM_OTHERS */
	phy_write_misc(phydev, AFE_HPF_TRIM_OTHERS, 0x000b);

	/* write AFTE_TX_CONFIG */
	phy_write_misc(phydev, AFE_TX_CONFIG, 0x0800);

	return 0;
	}

	static int bcm7xxx_apd_enable(struct phy_device *phydev)
	{
	int val;

	/* Enable powering down of the DLL during auto-power down */
	val = bcm54xx_shadow_read(phydev, BCM54XX_SHD_SCR3);
	if (val < 0)
	return val;

	val \|= BCM54XX_SHD_SCR3_DLLAPD_DIS;
	bcm54xx_shadow_write(phydev, BCM54XX_SHD_SCR3, val);

	/* Enable auto-power down */
	val = bcm54xx_shadow_read(phydev, BCM54XX_SHD_APD);
	if (val < 0)
	return val;

	val \|= BCM54XX_SHD_APD_EN;
	return bcm54xx_shadow_write(phydev, BCM54XX_SHD_APD, val);
	}

	static int bcm7xxx_eee_enable(struct phy_device *phydev)
	{
	int val;

	val = phy_read_mmd_indirect(phydev, BRCM_CL45VEN_EEE_CONTROL,
	MDIO_MMD_AN, phydev->addr);
	if (val < 0)
	return val;

	/* Enable general EEE feature at the PHY level */
	val \|= LPI_FEATURE_EN \| LPI_FEATURE_EN_DIG1000X;

	phy_write_mmd_indirect(phydev, BRCM_CL45VEN_EEE_CONTROL,
	MDIO_MMD_AN, phydev->addr, val);

	/* Advertise supported modes */
	val = phy_read_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
	MDIO_MMD_AN, phydev->addr);

	val \|= (MDIO_AN_EEE_ADV_100TX \| MDIO_AN_EEE_ADV_1000T);
	phy_write_mmd_indirect(phydev, MDIO_AN_EEE_ADV,
	MDIO_MMD_AN, phydev->addr, val);

	return 0;
	}

	static int bcm7xxx_28nm_config_init(struct phy_device *phydev)
	{
	u8 rev = PHY_BRCM_7XXX_REV(phydev->dev_flags);
	u8 patch = PHY_BRCM_7XXX_PATCH(phydev->dev_flags);
	int ret = 0;

	dev_info(&phydev->dev, "PHY revision: 0x%02x, patch: %d\n", rev, patch);

	switch (rev) {
	case 0xa0:
	case 0xb0:
	ret = bcm7445_config_init(phydev);
	break;
	default:
	ret = bcm7xxx_28nm_afe_config_init(phydev);
	break;
	}

	if (ret)
	return ret;

	ret = bcm7xxx_eee_enable(phydev);
	if (ret)
	return ret;

	return bcm7xxx_apd_enable(phydev);
	}

	static int bcm7xxx_28nm_resume(struct phy_device *phydev)
	{
	int ret;

	/* Re-apply workarounds coming out suspend/resume */
	ret = bcm7xxx_28nm_config_init(phydev);
	if (ret)
	return ret;

	/* 28nm Gigabit PHYs come out of reset without any half-duplex
	* or "hub" compliant advertised mode, fix that. This does not
	* cause any problems with the PHY library since genphy_config_aneg()
	* gracefully handles auto-negotiated and forced modes.
	*/
	return genphy_config_aneg(phydev);
	}

	static int phy_set_clr_bits(struct phy_device *dev, int location,
	int set_mask, int clr_mask)
	{
	int v, ret;

	v = phy_read(dev, location);
	if (v < 0)
	return v;

	v &= ~clr_mask;
	v \|= set_mask;

	ret = phy_write(dev, location, v);
	if (ret < 0)
	return ret;

	return v;
	}

	static int bcm7xxx_config_init(struct phy_device *phydev)
	{
	int ret;

	/* Enable 64 clock MDIO */
	phy_write(phydev, MII_BCM7XXX_AUX_MODE, MII_BCM7XX_64CLK_MDIO);
	phy_read(phydev, MII_BCM7XXX_AUX_MODE);

	/* Workaround only required for 100Mbits/sec capable PHYs */
	if (phydev->supported & PHY_GBIT_FEATURES)
	return 0;

	/* set shadow mode 2 */
	ret = phy_set_clr_bits(phydev, MII_BCM7XXX_TEST,
	MII_BCM7XXX_SHD_MODE_2, MII_BCM7XXX_SHD_MODE_2);
	if (ret < 0)
	return ret;

	/* set iddq_clkbias */
	phy_write(phydev, MII_BCM7XXX_100TX_DISC, 0x0F00);
	udelay(10);

	/* reset iddq_clkbias */
	phy_write(phydev, MII_BCM7XXX_100TX_DISC, 0x0C00);

	phy_write(phydev, MII_BCM7XXX_100TX_FALSE_CAR, 0x7555);

	/* reset shadow mode 2 */
	ret = phy_set_clr_bits(phydev, MII_BCM7XXX_TEST, MII_BCM7XXX_SHD_MODE_2, 0);
	if (ret < 0)
	return ret;

	return 0;
	}

	/* Workaround for putting the PHY in IDDQ mode, required
	* for all BCM7XXX 40nm and 65nm PHYs
	*/
	static int bcm7xxx_suspend(struct phy_device *phydev)
	{
	int ret;
	const struct bcm7xxx_regs {
	int reg;
	u16 value;
	} bcm7xxx_suspend_cfg[] = {
	{ MII_BCM7XXX_TEST, 0x008b },
	{ MII_BCM7XXX_100TX_AUX_CTL, 0x01c0 },
	{ MII_BCM7XXX_100TX_DISC, 0x7000 },
	{ MII_BCM7XXX_TEST, 0x000f },
	{ MII_BCM7XXX_100TX_AUX_CTL, 0x20d0 },
	{ MII_BCM7XXX_TEST, 0x000b },
	};
	unsigned int i;

	for (i = 0; i < ARRAY_SIZE(bcm7xxx_suspend_cfg); i++) {
	ret = phy_write(phydev,
	bcm7xxx_suspend_cfg[i].reg,
	bcm7xxx_suspend_cfg[i].value);
	if (ret)
	return ret;
	}

	return 0;
	}

	static int bcm7xxx_dummy_config_init(struct phy_device *phydev)
	{
	return 0;
	}

	#define BCM7XXX_28NM_GPHY(_oui, _name) \
	{ \
	.phy_id = (_oui), \
	.phy_id_mask = 0xfffffff0, \
	.name = _name, \
	.features = PHY_GBIT_FEATURES \| \
	SUPPORTED_Pause \| SUPPORTED_Asym_Pause, \
	.flags = PHY_IS_INTERNAL, \
	.config_init = bcm7xxx_28nm_afe_config_init, \
	.config_aneg = genphy_config_aneg, \
	.read_status = genphy_read_status, \
	.resume = bcm7xxx_28nm_resume, \
	.driver = { .owner = THIS_MODULE }, \
	}

	static struct phy_driver bcm7xxx_driver[] = {
	BCM7XXX_28NM_GPHY(PHY_ID_BCM7250, "Broadcom BCM7250"),
	BCM7XXX_28NM_GPHY(PHY_ID_BCM7364, "Broadcom BCM7364"),
	BCM7XXX_28NM_GPHY(PHY_ID_BCM7366, "Broadcom BCM7366"),
	BCM7XXX_28NM_GPHY(PHY_ID_BCM7439, "Broadcom BCM7439"),
	BCM7XXX_28NM_GPHY(PHY_ID_BCM7445, "Broadcom BCM7445"),
	{
	.phy_id = PHY_BCM_OUI_4,
	.phy_id_mask = 0xffff0000,
	.name = "Broadcom BCM7XXX 40nm",
	.features = PHY_GBIT_FEATURES \|
	SUPPORTED_Pause \| SUPPORTED_Asym_Pause,
	.flags = PHY_IS_INTERNAL,
	.config_init = bcm7xxx_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.suspend = bcm7xxx_suspend,
	.resume = bcm7xxx_config_init,
	.driver = { .owner = THIS_MODULE },
	}, {
	.phy_id = PHY_BCM_OUI_5,
	.phy_id_mask = 0xffffff00,
	.name = "Broadcom BCM7XXX 65nm",
	.features = PHY_BASIC_FEATURES \|
	SUPPORTED_Pause \| SUPPORTED_Asym_Pause,
	.flags = PHY_IS_INTERNAL,
	.config_init = bcm7xxx_dummy_config_init,
	.config_aneg = genphy_config_aneg,
	.read_status = genphy_read_status,
	.suspend = bcm7xxx_suspend,
	.resume = bcm7xxx_config_init,
	.driver = { .owner = THIS_MODULE },
	} };

	static struct mdio_device_id __maybe_unused bcm7xxx_tbl[] = {
	{ PHY_ID_BCM7250, 0xfffffff0, },
	{ PHY_ID_BCM7364, 0xfffffff0, },
	{ PHY_ID_BCM7366, 0xfffffff0, },
	{ PHY_ID_BCM7439, 0xfffffff0, },
	{ PHY_ID_BCM7445, 0xfffffff0, },
	{ PHY_BCM_OUI_4, 0xffff0000 },
	{ PHY_BCM_OUI_5, 0xffffff00 },
	{ }
	};

	static int __init bcm7xxx_phy_init(void)
	{
	return phy_drivers_register(bcm7xxx_driver,
	ARRAY_SIZE(bcm7xxx_driver));
	}

	static void __exit bcm7xxx_phy_exit(void)
	{
	phy_drivers_unregister(bcm7xxx_driver,
	ARRAY_SIZE(bcm7xxx_driver));
	}

	module_init(bcm7xxx_phy_init);
	module_exit(bcm7xxx_phy_exit);

	MODULE_DEVICE_TABLE(mdio, bcm7xxx_tbl);

	MODULE_DESCRIPTION("Broadcom BCM7xxx internal PHY driver");
	MODULE_LICENSE("GPL");
	MODULE_AUTHOR("Broadcom Corporation");