drivers/net/phy/bcm84881.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 // Broadcom BCM84881 NBASE-T PHY driver, as found on a SFP+ module.
 // Copyright (C) 2019 Russell King, Deep Blue Solutions Ltd.
 //
 // Like the Marvell 88x3310, the Broadcom 84881 changes its host-side
 // interface according to the operating speed between 10GBASE-R,
 // 2500BASE-X and SGMII (but unlike the 88x3310, without the control
 // word).
 //
 // This driver only supports those aspects of the PHY that I'm able to
 // observe and test with the SFP+ module, which is an incomplete subset
 // of what this PHY is able to support. For example, I only assume it
 // supports a single lane Serdes connection, but it may be that the PHY
 // is able to support more than that.
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/phy.h>

 enum {
 	MDIO_AN_C22 = 0xffe0,
 };

 static int bcm84881_wait_init(struct phy_device *phydev)
 {
 	int val;

 	return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1,
 					 val, !(val & MDIO_CTRL1_RESET),
 					 100000, 2000000, false);
 }

 static void bcm84881_fill_possible_interfaces(struct phy_device *phydev)
 {
 	unsigned long *possible = phydev->possible_interfaces;

 	__set_bit(PHY_INTERFACE_MODE_SGMII, possible);
 	__set_bit(PHY_INTERFACE_MODE_2500BASEX, possible);
 	__set_bit(PHY_INTERFACE_MODE_10GBASER, possible);
 }

 static int bcm84881_config_init(struct phy_device *phydev)
 {
 	bcm84881_fill_possible_interfaces(phydev);

 	switch (phydev->interface) {
 	case PHY_INTERFACE_MODE_SGMII:
 	case PHY_INTERFACE_MODE_2500BASEX:
 	case PHY_INTERFACE_MODE_10GBASER:
 		break;
 	default:
 		return -ENODEV;
 	}

 	return 0;
 }

 static int bcm84881_probe(struct phy_device *phydev)
 {
 	/* This driver requires PMAPMD and AN blocks */
 	const u32 mmd_mask = MDIO_DEVS_PMAPMD | MDIO_DEVS_AN;

 	if (!phydev->is_c45 ||
 	    (phydev->c45_ids.devices_in_package & mmd_mask) != mmd_mask)
 		return -ENODEV;

 	return 0;
 }

 static int bcm84881_get_features(struct phy_device *phydev)
 {
 	int ret;

 	ret = genphy_c45_pma_read_abilities(phydev);
 	if (ret)
 		return ret;

 	/* Although the PHY sets bit 1.11.8, it does not support 10M modes */
 	linkmode_clear_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
 			   phydev->supported);
 	linkmode_clear_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
 			   phydev->supported);

 	return 0;
 }

 static int bcm84881_config_aneg(struct phy_device *phydev)
 {
 	bool changed = false;
 	u32 adv;
 	int ret;

 	/* Wait for the PHY to finish initialising, otherwise our
 	 * advertisement may be overwritten.
 	 */
 	ret = bcm84881_wait_init(phydev);
 	if (ret)
 		return ret;

 	/* We don't support manual MDI control */
 	phydev->mdix_ctrl = ETH_TP_MDI_AUTO;

 	/* disabled autoneg doesn't seem to work with this PHY */
 	if (phydev->autoneg == AUTONEG_DISABLE)
 		return -EINVAL;

 	ret = genphy_c45_an_config_aneg(phydev);
 	if (ret < 0)
 		return ret;
 	if (ret > 0)
 		changed = true;

 	adv = linkmode_adv_to_mii_ctrl1000_t(phydev->advertising);
 	ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN,
 				     MDIO_AN_C22 + MII_CTRL1000,
 				     ADVERTISE_1000FULL | ADVERTISE_1000HALF,
 				     adv);
 	if (ret < 0)
 		return ret;
 	if (ret > 0)
 		changed = true;

 	return genphy_c45_check_and_restart_aneg(phydev, changed);
 }

 static int bcm84881_aneg_done(struct phy_device *phydev)
 {
 	int bmsr, val;

 	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
 	if (val < 0)
 		return val;

 	bmsr = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_C22 + MII_BMSR);
 	if (bmsr < 0)
 		return val;

 	return !!(val & MDIO_AN_STAT1_COMPLETE) &&
 	       !!(bmsr & BMSR_ANEGCOMPLETE);
 }

 static int bcm84881_read_status(struct phy_device *phydev)
 {
 	unsigned int mode;
 	int bmsr, val;

 	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
 	if (val < 0)
 		return val;

 	if (val & MDIO_AN_CTRL1_RESTART) {
 		phydev->link = 0;
 		return 0;
 	}

 	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
 	if (val < 0)
 		return val;

 	bmsr = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_C22 + MII_BMSR);
 	if (bmsr < 0)
 		return val;

 	phydev->autoneg_complete = !!(val & MDIO_AN_STAT1_COMPLETE) &&
 				   !!(bmsr & BMSR_ANEGCOMPLETE);
 	phydev->link = !!(val & MDIO_STAT1_LSTATUS) &&
 		       !!(bmsr & BMSR_LSTATUS);
 	if (phydev->autoneg == AUTONEG_ENABLE && !phydev->autoneg_complete)
 		phydev->link = false;

 	linkmode_zero(phydev->lp_advertising);
 	phydev->speed = SPEED_UNKNOWN;
 	phydev->duplex = DUPLEX_UNKNOWN;
 	phydev->pause = 0;
 	phydev->asym_pause = 0;
 	phydev->mdix = 0;

 	if (!phydev->link)
 		return 0;

 	if (phydev->autoneg_complete) {
 		val = genphy_c45_read_lpa(phydev);
 		if (val < 0)
 			return val;

 		val = phy_read_mmd(phydev, MDIO_MMD_AN,
 				   MDIO_AN_C22 + MII_STAT1000);
 		if (val < 0)
 			return val;

 		mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, val);

 		if (phydev->autoneg == AUTONEG_ENABLE)
 			phy_resolve_aneg_linkmode(phydev);
 	}

 	if (phydev->autoneg == AUTONEG_DISABLE) {
 		/* disabled autoneg doesn't seem to work, so force the link
 		 * down.
 		 */
 		phydev->link = 0;
 		return 0;
 	}

 	/* Set the host link mode - we set the phy interface mode and
 	 * the speed according to this register so that downshift works.
 	 * We leave the duplex setting as per the resolution from the
 	 * above.
 	 */
 	val = phy_read_mmd(phydev, MDIO_MMD_VEND1, 0x4011);
 	mode = (val & 0x1e) >> 1;
 	if (mode == 1 || mode == 2)
 		phydev->interface = PHY_INTERFACE_MODE_SGMII;
 	else if (mode == 3)
 		phydev->interface = PHY_INTERFACE_MODE_10GBASER;
 	else if (mode == 4)
 		phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
 	switch (mode & 7) {
 	case 1:
 		phydev->speed = SPEED_100;
 		break;
 	case 2:
 		phydev->speed = SPEED_1000;
 		break;
 	case 3:
 		phydev->speed = SPEED_10000;
 		break;
 	case 4:
 		phydev->speed = SPEED_2500;
 		break;
 	case 5:
 		phydev->speed = SPEED_5000;
 		break;
 	}

 	return genphy_c45_read_mdix(phydev);
 }

 static struct phy_driver bcm84881_drivers[] = {
 	{
 		.phy_id		= 0xae025150,
 		.phy_id_mask	= 0xfffffff0,
 		.name		= "Broadcom BCM84881",
 		.config_init	= bcm84881_config_init,
 		.probe		= bcm84881_probe,
 		.get_features	= bcm84881_get_features,
 		.config_aneg	= bcm84881_config_aneg,
 		.aneg_done	= bcm84881_aneg_done,
 		.read_status	= bcm84881_read_status,
 	},
 };

 module_phy_driver(bcm84881_drivers);

 /* FIXME: module auto-loading for Clause 45 PHYs seems non-functional */
 static struct mdio_device_id __maybe_unused bcm84881_tbl[] = {
 	{ 0xae025150, 0xfffffff0 },
 	{ },
 };
 MODULE_AUTHOR("Russell King");
 MODULE_DESCRIPTION("Broadcom BCM84881 PHY driver");
 MODULE_DEVICE_TABLE(mdio, bcm84881_tbl);
 MODULE_LICENSE("GPL");
	// SPDX-License-Identifier: GPL-2.0
	// Broadcom BCM84881 NBASE-T PHY driver, as found on a SFP+ module.
	// Copyright (C) 2019 Russell King, Deep Blue Solutions Ltd.
	//
	// Like the Marvell 88x3310, the Broadcom 84881 changes its host-side
	// interface according to the operating speed between 10GBASE-R,
	// 2500BASE-X and SGMII (but unlike the 88x3310, without the control
	// word).
	//
	// This driver only supports those aspects of the PHY that I'm able to
	// observe and test with the SFP+ module, which is an incomplete subset
	// of what this PHY is able to support. For example, I only assume it
	// supports a single lane Serdes connection, but it may be that the PHY
	// is able to support more than that.
	#include <linux/delay.h>
	#include <linux/module.h>
	#include <linux/phy.h>

	enum {
	MDIO_AN_C22 = 0xffe0,
	};

	static int bcm84881_wait_init(struct phy_device *phydev)
	{
	int val;

	return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1,
	val, !(val & MDIO_CTRL1_RESET),
	100000, 2000000, false);
	}

	static void bcm84881_fill_possible_interfaces(struct phy_device *phydev)
	{
	unsigned long *possible = phydev->possible_interfaces;

	__set_bit(PHY_INTERFACE_MODE_SGMII, possible);
	__set_bit(PHY_INTERFACE_MODE_2500BASEX, possible);
	__set_bit(PHY_INTERFACE_MODE_10GBASER, possible);
	}

	static int bcm84881_config_init(struct phy_device *phydev)
	{
	bcm84881_fill_possible_interfaces(phydev);

	switch (phydev->interface) {
	case PHY_INTERFACE_MODE_SGMII:
	case PHY_INTERFACE_MODE_2500BASEX:
	case PHY_INTERFACE_MODE_10GBASER:
	break;
	default:
	return -ENODEV;
	}

	return 0;
	}

	static int bcm84881_probe(struct phy_device *phydev)
	{
	/* This driver requires PMAPMD and AN blocks */
	const u32 mmd_mask = MDIO_DEVS_PMAPMD \| MDIO_DEVS_AN;

	if (!phydev->is_c45 \|\|
	(phydev->c45_ids.devices_in_package & mmd_mask) != mmd_mask)
	return -ENODEV;

	return 0;
	}

	static int bcm84881_get_features(struct phy_device *phydev)
	{
	int ret;

	ret = genphy_c45_pma_read_abilities(phydev);
	if (ret)
	return ret;

	/* Although the PHY sets bit 1.11.8, it does not support 10M modes */
	linkmode_clear_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
	phydev->supported);
	linkmode_clear_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
	phydev->supported);

	return 0;
	}

	static int bcm84881_config_aneg(struct phy_device *phydev)
	{
	bool changed = false;
	u32 adv;
	int ret;

	/* Wait for the PHY to finish initialising, otherwise our
	* advertisement may be overwritten.
	*/
	ret = bcm84881_wait_init(phydev);
	if (ret)
	return ret;

	/* We don't support manual MDI control */
	phydev->mdix_ctrl = ETH_TP_MDI_AUTO;

	/* disabled autoneg doesn't seem to work with this PHY */
	if (phydev->autoneg == AUTONEG_DISABLE)
	return -EINVAL;

	ret = genphy_c45_an_config_aneg(phydev);
	if (ret < 0)
	return ret;
	if (ret > 0)
	changed = true;

	adv = linkmode_adv_to_mii_ctrl1000_t(phydev->advertising);
	ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN,
	MDIO_AN_C22 + MII_CTRL1000,
	ADVERTISE_1000FULL \| ADVERTISE_1000HALF,
	adv);
	if (ret < 0)
	return ret;
	if (ret > 0)
	changed = true;

	return genphy_c45_check_and_restart_aneg(phydev, changed);
	}

	static int bcm84881_aneg_done(struct phy_device *phydev)
	{
	int bmsr, val;

	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
	if (val < 0)
	return val;

	bmsr = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_C22 + MII_BMSR);
	if (bmsr < 0)
	return val;

	return !!(val & MDIO_AN_STAT1_COMPLETE) &&
	!!(bmsr & BMSR_ANEGCOMPLETE);
	}

	static int bcm84881_read_status(struct phy_device *phydev)
	{
	unsigned int mode;
	int bmsr, val;

	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
	if (val < 0)
	return val;

	if (val & MDIO_AN_CTRL1_RESTART) {
	phydev->link = 0;
	return 0;
	}

	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
	if (val < 0)
	return val;

	bmsr = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_C22 + MII_BMSR);
	if (bmsr < 0)
	return val;

	phydev->autoneg_complete = !!(val & MDIO_AN_STAT1_COMPLETE) &&
	!!(bmsr & BMSR_ANEGCOMPLETE);
	phydev->link = !!(val & MDIO_STAT1_LSTATUS) &&
	!!(bmsr & BMSR_LSTATUS);
	if (phydev->autoneg == AUTONEG_ENABLE && !phydev->autoneg_complete)
	phydev->link = false;

	linkmode_zero(phydev->lp_advertising);
	phydev->speed = SPEED_UNKNOWN;
	phydev->duplex = DUPLEX_UNKNOWN;
	phydev->pause = 0;
	phydev->asym_pause = 0;
	phydev->mdix = 0;

	if (!phydev->link)
	return 0;

	if (phydev->autoneg_complete) {
	val = genphy_c45_read_lpa(phydev);
	if (val < 0)
	return val;

	val = phy_read_mmd(phydev, MDIO_MMD_AN,
	MDIO_AN_C22 + MII_STAT1000);
	if (val < 0)
	return val;

	mii_stat1000_mod_linkmode_lpa_t(phydev->lp_advertising, val);

	if (phydev->autoneg == AUTONEG_ENABLE)
	phy_resolve_aneg_linkmode(phydev);
	}

	if (phydev->autoneg == AUTONEG_DISABLE) {
	/* disabled autoneg doesn't seem to work, so force the link
	* down.
	*/
	phydev->link = 0;
	return 0;
	}

	/* Set the host link mode - we set the phy interface mode and
	* the speed according to this register so that downshift works.
	* We leave the duplex setting as per the resolution from the
	* above.
	*/
	val = phy_read_mmd(phydev, MDIO_MMD_VEND1, 0x4011);
	mode = (val & 0x1e) >> 1;
	if (mode == 1 \|\| mode == 2)
	phydev->interface = PHY_INTERFACE_MODE_SGMII;
	else if (mode == 3)
	phydev->interface = PHY_INTERFACE_MODE_10GBASER;
	else if (mode == 4)
	phydev->interface = PHY_INTERFACE_MODE_2500BASEX;
	switch (mode & 7) {
	case 1:
	phydev->speed = SPEED_100;
	break;
	case 2:
	phydev->speed = SPEED_1000;
	break;
	case 3:
	phydev->speed = SPEED_10000;
	break;
	case 4:
	phydev->speed = SPEED_2500;
	break;
	case 5:
	phydev->speed = SPEED_5000;
	break;
	}

	return genphy_c45_read_mdix(phydev);
	}

	static struct phy_driver bcm84881_drivers[] = {
	{
	.phy_id = 0xae025150,
	.phy_id_mask = 0xfffffff0,
	.name = "Broadcom BCM84881",
	.config_init = bcm84881_config_init,
	.probe = bcm84881_probe,
	.get_features = bcm84881_get_features,
	.config_aneg = bcm84881_config_aneg,
	.aneg_done = bcm84881_aneg_done,
	.read_status = bcm84881_read_status,
	},
	};

	module_phy_driver(bcm84881_drivers);

	/* FIXME: module auto-loading for Clause 45 PHYs seems non-functional */
	static struct mdio_device_id __maybe_unused bcm84881_tbl[] = {
	{ 0xae025150, 0xfffffff0 },
	{ },
	};
	MODULE_AUTHOR("Russell King");
	MODULE_DESCRIPTION("Broadcom BCM84881 PHY driver");
	MODULE_DEVICE_TABLE(mdio, bcm84881_tbl);
	MODULE_LICENSE("GPL");