drivers/net/phy/smsc.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0+
 /*
  * drivers/net/phy/smsc.c
  *
  * Driver for SMSC PHYs
  *
  * Author: Herbert Valerio Riedel
  *
  * Copyright (c) 2006 Herbert Valerio Riedel <hvr@gnu.org>
  *
  * Support added for SMSC LAN8187 and LAN8700 by steve.glendinning@shawell.net
  *
  */

 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/mii.h>
 #include <linux/ethtool.h>
 #include <linux/of.h>
 #include <linux/phy.h>
 #include <linux/netdevice.h>
 #include <linux/smscphy.h>

 struct smsc_hw_stat {
 	const char *string;
 	u8 reg;
 	u8 bits;
 };

 static struct smsc_hw_stat smsc_hw_stats[] = {
 	{ "phy_symbol_errors", 26, 16},
 };

 struct smsc_phy_priv {
 	bool energy_enable;
 };

 static int smsc_phy_config_intr(struct phy_device *phydev)
 {
 	int rc = phy_write (phydev, MII_LAN83C185_IM,
 			((PHY_INTERRUPT_ENABLED == phydev->interrupts)
 			? MII_LAN83C185_ISF_INT_PHYLIB_EVENTS
 			: 0));

 	return rc < 0 ? rc : 0;
 }

 static int smsc_phy_ack_interrupt(struct phy_device *phydev)
 {
 	int rc = phy_read (phydev, MII_LAN83C185_ISF);

 	return rc < 0 ? rc : 0;
 }

 static int smsc_phy_config_init(struct phy_device *phydev)
 {
 	struct smsc_phy_priv *priv = phydev->priv;

 	int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);

 	if (rc < 0)
 		return rc;

 	if (priv->energy_enable) {
 		/* Enable energy detect mode for this SMSC Transceivers */
 		rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
 			       rc | MII_LAN83C185_EDPWRDOWN);
 		if (rc < 0)
 			return rc;
 	}

 	return smsc_phy_ack_interrupt(phydev);
 }

 static int smsc_phy_reset(struct phy_device *phydev)
 {
 	int rc = phy_read(phydev, MII_LAN83C185_SPECIAL_MODES);
 	if (rc < 0)
 		return rc;

 	/* If the SMSC PHY is in power down mode, then set it
 	 * in all capable mode before using it.
 	 */
 	if ((rc & MII_LAN83C185_MODE_MASK) == MII_LAN83C185_MODE_POWERDOWN) {
 		/* set "all capable" mode */
 		rc |= MII_LAN83C185_MODE_ALL;
 		phy_write(phydev, MII_LAN83C185_SPECIAL_MODES, rc);
 	}

 	/* reset the phy */
 	return genphy_soft_reset(phydev);
 }

 static int lan911x_config_init(struct phy_device *phydev)
 {
 	return smsc_phy_ack_interrupt(phydev);
 }

 /*
  * The LAN87xx suffers from rare absence of the ENERGYON-bit when Ethernet cable
  * plugs in while LAN87xx is in Energy Detect Power-Down mode. This leads to
  * unstable detection of plugging in Ethernet cable.
  * This workaround disables Energy Detect Power-Down mode and waiting for
  * response on link pulses to detect presence of plugged Ethernet cable.
  * The Energy Detect Power-Down mode is enabled again in the end of procedure to
  * save approximately 220 mW of power if cable is unplugged.
  */
 static int lan87xx_read_status(struct phy_device *phydev)
 {
 	struct smsc_phy_priv *priv = phydev->priv;

 	int err = genphy_read_status(phydev);

 	if (!phydev->link && priv->energy_enable) {
 		int i;

 		/* Disable EDPD to wake up PHY */
 		int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
 		if (rc < 0)
 			return rc;

 		rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
 			       rc & ~MII_LAN83C185_EDPWRDOWN);
 		if (rc < 0)
 			return rc;

 		/* Wait max 640 ms to detect energy */
 		for (i = 0; i < 64; i++) {
 			/* Sleep to allow link test pulses to be sent */
 			msleep(10);
 			rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
 			if (rc < 0)
 				return rc;
 			if (rc & MII_LAN83C185_ENERGYON)
 				break;
 		}

 		/* Re-enable EDPD */
 		rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
 		if (rc < 0)
 			return rc;

 		rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
 			       rc | MII_LAN83C185_EDPWRDOWN);
 		if (rc < 0)
 			return rc;
 	}

 	return err;
 }

 static int smsc_get_sset_count(struct phy_device *phydev)
 {
 	return ARRAY_SIZE(smsc_hw_stats);
 }

 static void smsc_get_strings(struct phy_device *phydev, u8 *data)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++) {
 		strncpy(data + i * ETH_GSTRING_LEN,
 		       smsc_hw_stats[i].string, ETH_GSTRING_LEN);
 	}
 }

 static u64 smsc_get_stat(struct phy_device *phydev, int i)
 {
 	struct smsc_hw_stat stat = smsc_hw_stats[i];
 	int val;
 	u64 ret;

 	val = phy_read(phydev, stat.reg);
 	if (val < 0)
 		ret = U64_MAX;
 	else
 		ret = val;

 	return ret;
 }

 static void smsc_get_stats(struct phy_device *phydev,
 			   struct ethtool_stats *stats, u64 *data)
 {
 	int i;

 	for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++)
 		data[i] = smsc_get_stat(phydev, i);
 }

 static int smsc_phy_probe(struct phy_device *phydev)
 {
 	struct device *dev = &phydev->mdio.dev;
 	struct device_node *of_node = dev->of_node;
 	struct smsc_phy_priv *priv;

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

 	priv->energy_enable = true;

 	if (of_property_read_bool(of_node, "smsc,disable-energy-detect"))
 		priv->energy_enable = false;

 	phydev->priv = priv;

 	return 0;
 }

 static struct phy_driver smsc_phy_driver[] = {
 {
 	.phy_id		= 0x0007c0a0, /* OUI=0x00800f, Model#=0x0a */
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "SMSC LAN83C185",

 	/* PHY_BASIC_FEATURES */

 	.probe		= smsc_phy_probe,

 	/* basic functions */
 	.config_init	= smsc_phy_config_init,
 	.soft_reset	= smsc_phy_reset,

 	/* IRQ related */
 	.ack_interrupt	= smsc_phy_ack_interrupt,
 	.config_intr	= smsc_phy_config_intr,

 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 }, {
 	.phy_id		= 0x0007c0b0, /* OUI=0x00800f, Model#=0x0b */
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "SMSC LAN8187",

 	/* PHY_BASIC_FEATURES */

 	.probe		= smsc_phy_probe,

 	/* basic functions */
 	.config_init	= smsc_phy_config_init,
 	.soft_reset	= smsc_phy_reset,

 	/* IRQ related */
 	.ack_interrupt	= smsc_phy_ack_interrupt,
 	.config_intr	= smsc_phy_config_intr,

 	/* Statistics */
 	.get_sset_count = smsc_get_sset_count,
 	.get_strings	= smsc_get_strings,
 	.get_stats	= smsc_get_stats,

 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 }, {
 	.phy_id		= 0x0007c0c0, /* OUI=0x00800f, Model#=0x0c */
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "SMSC LAN8700",

 	/* PHY_BASIC_FEATURES */

 	.probe		= smsc_phy_probe,

 	/* basic functions */
 	.read_status	= lan87xx_read_status,
 	.config_init	= smsc_phy_config_init,
 	.soft_reset	= smsc_phy_reset,

 	/* IRQ related */
 	.ack_interrupt	= smsc_phy_ack_interrupt,
 	.config_intr	= smsc_phy_config_intr,

 	/* Statistics */
 	.get_sset_count = smsc_get_sset_count,
 	.get_strings	= smsc_get_strings,
 	.get_stats	= smsc_get_stats,

 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 }, {
 	.phy_id		= 0x0007c0d0, /* OUI=0x00800f, Model#=0x0d */
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "SMSC LAN911x Internal PHY",

 	/* PHY_BASIC_FEATURES */

 	.probe		= smsc_phy_probe,

 	/* basic functions */
 	.config_init	= lan911x_config_init,

 	/* IRQ related */
 	.ack_interrupt	= smsc_phy_ack_interrupt,
 	.config_intr	= smsc_phy_config_intr,

 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 }, {
 	.phy_id		= 0x0007c0f0, /* OUI=0x00800f, Model#=0x0f */
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "SMSC LAN8710/LAN8720",

 	/* PHY_BASIC_FEATURES */
 	.flags		= PHY_RST_AFTER_CLK_EN,

 	.probe		= smsc_phy_probe,

 	/* basic functions */
 	.read_status	= lan87xx_read_status,
 	.config_init	= smsc_phy_config_init,
 	.soft_reset	= smsc_phy_reset,

 	/* IRQ related */
 	.ack_interrupt	= smsc_phy_ack_interrupt,
 	.config_intr	= smsc_phy_config_intr,

 	/* Statistics */
 	.get_sset_count = smsc_get_sset_count,
 	.get_strings	= smsc_get_strings,
 	.get_stats	= smsc_get_stats,

 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 }, {
 	.phy_id		= 0x0007c110,
 	.phy_id_mask	= 0xfffffff0,
 	.name		= "SMSC LAN8740",

 	/* PHY_BASIC_FEATURES */

 	.probe		= smsc_phy_probe,

 	/* basic functions */
 	.read_status	= lan87xx_read_status,
 	.config_init	= smsc_phy_config_init,
 	.soft_reset	= smsc_phy_reset,

 	/* IRQ related */
 	.ack_interrupt	= smsc_phy_ack_interrupt,
 	.config_intr	= smsc_phy_config_intr,

 	/* Statistics */
 	.get_sset_count = smsc_get_sset_count,
 	.get_strings	= smsc_get_strings,
 	.get_stats	= smsc_get_stats,

 	.suspend	= genphy_suspend,
 	.resume		= genphy_resume,
 } };

 module_phy_driver(smsc_phy_driver);

 MODULE_DESCRIPTION("SMSC PHY driver");
 MODULE_AUTHOR("Herbert Valerio Riedel");
 MODULE_LICENSE("GPL");

 static struct mdio_device_id __maybe_unused smsc_tbl[] = {
 	{ 0x0007c0a0, 0xfffffff0 },
 	{ 0x0007c0b0, 0xfffffff0 },
 	{ 0x0007c0c0, 0xfffffff0 },
 	{ 0x0007c0d0, 0xfffffff0 },
 	{ 0x0007c0f0, 0xfffffff0 },
 	{ 0x0007c110, 0xfffffff0 },
 	{ }
 };

 MODULE_DEVICE_TABLE(mdio, smsc_tbl);
	// SPDX-License-Identifier: GPL-2.0+
	/*
	* drivers/net/phy/smsc.c
	*
	* Driver for SMSC PHYs
	*
	* Author: Herbert Valerio Riedel
	*
	* Copyright (c) 2006 Herbert Valerio Riedel <hvr@gnu.org>
	*
	* Support added for SMSC LAN8187 and LAN8700 by steve.glendinning@shawell.net
	*
	*/

	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/mii.h>
	#include <linux/ethtool.h>
	#include <linux/of.h>
	#include <linux/phy.h>
	#include <linux/netdevice.h>
	#include <linux/smscphy.h>

	struct smsc_hw_stat {
	const char *string;
	u8 reg;
	u8 bits;
	};

	static struct smsc_hw_stat smsc_hw_stats[] = {
	{ "phy_symbol_errors", 26, 16},
	};

	struct smsc_phy_priv {
	bool energy_enable;
	};

	static int smsc_phy_config_intr(struct phy_device *phydev)
	{
	int rc = phy_write (phydev, MII_LAN83C185_IM,
	((PHY_INTERRUPT_ENABLED == phydev->interrupts)
	? MII_LAN83C185_ISF_INT_PHYLIB_EVENTS
	: 0));

	return rc < 0 ? rc : 0;
	}

	static int smsc_phy_ack_interrupt(struct phy_device *phydev)
	{
	int rc = phy_read (phydev, MII_LAN83C185_ISF);

	return rc < 0 ? rc : 0;
	}

	static int smsc_phy_config_init(struct phy_device *phydev)
	{
	struct smsc_phy_priv *priv = phydev->priv;

	int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);

	if (rc < 0)
	return rc;

	if (priv->energy_enable) {
	/* Enable energy detect mode for this SMSC Transceivers */
	rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
	rc \| MII_LAN83C185_EDPWRDOWN);
	if (rc < 0)
	return rc;
	}

	return smsc_phy_ack_interrupt(phydev);
	}

	static int smsc_phy_reset(struct phy_device *phydev)
	{
	int rc = phy_read(phydev, MII_LAN83C185_SPECIAL_MODES);
	if (rc < 0)
	return rc;

	/* If the SMSC PHY is in power down mode, then set it
	* in all capable mode before using it.
	*/
	if ((rc & MII_LAN83C185_MODE_MASK) == MII_LAN83C185_MODE_POWERDOWN) {
	/* set "all capable" mode */
	rc \|= MII_LAN83C185_MODE_ALL;
	phy_write(phydev, MII_LAN83C185_SPECIAL_MODES, rc);
	}

	/* reset the phy */
	return genphy_soft_reset(phydev);
	}

	static int lan911x_config_init(struct phy_device *phydev)
	{
	return smsc_phy_ack_interrupt(phydev);
	}

	/*
	* The LAN87xx suffers from rare absence of the ENERGYON-bit when Ethernet cable
	* plugs in while LAN87xx is in Energy Detect Power-Down mode. This leads to
	* unstable detection of plugging in Ethernet cable.
	* This workaround disables Energy Detect Power-Down mode and waiting for
	* response on link pulses to detect presence of plugged Ethernet cable.
	* The Energy Detect Power-Down mode is enabled again in the end of procedure to
	* save approximately 220 mW of power if cable is unplugged.
	*/
	static int lan87xx_read_status(struct phy_device *phydev)
	{
	struct smsc_phy_priv *priv = phydev->priv;

	int err = genphy_read_status(phydev);

	if (!phydev->link && priv->energy_enable) {
	int i;

	/* Disable EDPD to wake up PHY */
	int rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
	if (rc < 0)
	return rc;

	rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
	rc & ~MII_LAN83C185_EDPWRDOWN);
	if (rc < 0)
	return rc;

	/* Wait max 640 ms to detect energy */
	for (i = 0; i < 64; i++) {
	/* Sleep to allow link test pulses to be sent */
	msleep(10);
	rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
	if (rc < 0)
	return rc;
	if (rc & MII_LAN83C185_ENERGYON)
	break;
	}

	/* Re-enable EDPD */
	rc = phy_read(phydev, MII_LAN83C185_CTRL_STATUS);
	if (rc < 0)
	return rc;

	rc = phy_write(phydev, MII_LAN83C185_CTRL_STATUS,
	rc \| MII_LAN83C185_EDPWRDOWN);
	if (rc < 0)
	return rc;
	}

	return err;
	}

	static int smsc_get_sset_count(struct phy_device *phydev)
	{
	return ARRAY_SIZE(smsc_hw_stats);
	}

	static void smsc_get_strings(struct phy_device phydev, u8 data)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++) {
	strncpy(data + i * ETH_GSTRING_LEN,
	smsc_hw_stats[i].string, ETH_GSTRING_LEN);
	}
	}

	static u64 smsc_get_stat(struct phy_device *phydev, int i)
	{
	struct smsc_hw_stat stat = smsc_hw_stats[i];
	int val;
	u64 ret;

	val = phy_read(phydev, stat.reg);
	if (val < 0)
	ret = U64_MAX;
	else
	ret = val;

	return ret;
	}

	static void smsc_get_stats(struct phy_device *phydev,
	struct ethtool_stats stats, u64 data)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(smsc_hw_stats); i++)
	data[i] = smsc_get_stat(phydev, i);
	}

	static int smsc_phy_probe(struct phy_device *phydev)
	{
	struct device *dev = &phydev->mdio.dev;
	struct device_node *of_node = dev->of_node;
	struct smsc_phy_priv *priv;

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

	priv->energy_enable = true;

	if (of_property_read_bool(of_node, "smsc,disable-energy-detect"))
	priv->energy_enable = false;

	phydev->priv = priv;

	return 0;
	}

	static struct phy_driver smsc_phy_driver[] = {
	{
	.phy_id = 0x0007c0a0, /* OUI=0x00800f, Model#=0x0a */
	.phy_id_mask = 0xfffffff0,
	.name = "SMSC LAN83C185",

	/* PHY_BASIC_FEATURES */

	.probe = smsc_phy_probe,

	/* basic functions */
	.config_init = smsc_phy_config_init,
	.soft_reset = smsc_phy_reset,

	/* IRQ related */
	.ack_interrupt = smsc_phy_ack_interrupt,
	.config_intr = smsc_phy_config_intr,

	.suspend = genphy_suspend,
	.resume = genphy_resume,
	}, {
	.phy_id = 0x0007c0b0, /* OUI=0x00800f, Model#=0x0b */
	.phy_id_mask = 0xfffffff0,
	.name = "SMSC LAN8187",

	/* PHY_BASIC_FEATURES */

	.probe = smsc_phy_probe,

	/* basic functions */
	.config_init = smsc_phy_config_init,
	.soft_reset = smsc_phy_reset,

	/* IRQ related */
	.ack_interrupt = smsc_phy_ack_interrupt,
	.config_intr = smsc_phy_config_intr,

	/* Statistics */
	.get_sset_count = smsc_get_sset_count,
	.get_strings = smsc_get_strings,
	.get_stats = smsc_get_stats,

	.suspend = genphy_suspend,
	.resume = genphy_resume,
	}, {
	.phy_id = 0x0007c0c0, /* OUI=0x00800f, Model#=0x0c */
	.phy_id_mask = 0xfffffff0,
	.name = "SMSC LAN8700",

	/* PHY_BASIC_FEATURES */

	.probe = smsc_phy_probe,

	/* basic functions */
	.read_status = lan87xx_read_status,
	.config_init = smsc_phy_config_init,
	.soft_reset = smsc_phy_reset,

	/* IRQ related */
	.ack_interrupt = smsc_phy_ack_interrupt,
	.config_intr = smsc_phy_config_intr,

	/* Statistics */
	.get_sset_count = smsc_get_sset_count,
	.get_strings = smsc_get_strings,
	.get_stats = smsc_get_stats,

	.suspend = genphy_suspend,
	.resume = genphy_resume,
	}, {
	.phy_id = 0x0007c0d0, /* OUI=0x00800f, Model#=0x0d */
	.phy_id_mask = 0xfffffff0,
	.name = "SMSC LAN911x Internal PHY",

	/* PHY_BASIC_FEATURES */

	.probe = smsc_phy_probe,

	/* basic functions */
	.config_init = lan911x_config_init,

	/* IRQ related */
	.ack_interrupt = smsc_phy_ack_interrupt,
	.config_intr = smsc_phy_config_intr,

	.suspend = genphy_suspend,
	.resume = genphy_resume,
	}, {
	.phy_id = 0x0007c0f0, /* OUI=0x00800f, Model#=0x0f */
	.phy_id_mask = 0xfffffff0,
	.name = "SMSC LAN8710/LAN8720",

	/* PHY_BASIC_FEATURES */
	.flags = PHY_RST_AFTER_CLK_EN,

	.probe = smsc_phy_probe,

	/* basic functions */
	.read_status = lan87xx_read_status,
	.config_init = smsc_phy_config_init,
	.soft_reset = smsc_phy_reset,

	/* IRQ related */
	.ack_interrupt = smsc_phy_ack_interrupt,
	.config_intr = smsc_phy_config_intr,

	/* Statistics */
	.get_sset_count = smsc_get_sset_count,
	.get_strings = smsc_get_strings,
	.get_stats = smsc_get_stats,

	.suspend = genphy_suspend,
	.resume = genphy_resume,
	}, {
	.phy_id = 0x0007c110,
	.phy_id_mask = 0xfffffff0,
	.name = "SMSC LAN8740",

	/* PHY_BASIC_FEATURES */

	.probe = smsc_phy_probe,

	/* basic functions */
	.read_status = lan87xx_read_status,
	.config_init = smsc_phy_config_init,
	.soft_reset = smsc_phy_reset,

	/* IRQ related */
	.ack_interrupt = smsc_phy_ack_interrupt,
	.config_intr = smsc_phy_config_intr,

	/* Statistics */
	.get_sset_count = smsc_get_sset_count,
	.get_strings = smsc_get_strings,
	.get_stats = smsc_get_stats,

	.suspend = genphy_suspend,
	.resume = genphy_resume,
	} };

	module_phy_driver(smsc_phy_driver);

	MODULE_DESCRIPTION("SMSC PHY driver");
	MODULE_AUTHOR("Herbert Valerio Riedel");
	MODULE_LICENSE("GPL");

	static struct mdio_device_id __maybe_unused smsc_tbl[] = {
	{ 0x0007c0a0, 0xfffffff0 },
	{ 0x0007c0b0, 0xfffffff0 },
	{ 0x0007c0c0, 0xfffffff0 },
	{ 0x0007c0d0, 0xfffffff0 },
	{ 0x0007c0f0, 0xfffffff0 },
	{ 0x0007c110, 0xfffffff0 },
	{ }
	};

	MODULE_DEVICE_TABLE(mdio, smsc_tbl);