drivers/net/phy/phy-c45.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Clause 45 PHY support
  */
 #include <linux/ethtool.h>
 #include <linux/export.h>
 #include <linux/mdio.h>
 #include <linux/mii.h>
 #include <linux/phy.h>

 /**
  * genphy_c45_pma_can_sleep - checks if the PMA have sleep support
  * @phydev: target phy_device struct
  */
 static bool genphy_c45_pma_can_sleep(struct phy_device *phydev)
 {
 	int stat1;

 	stat1 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_STAT1);
 	if (stat1 < 0)
 		return false;

 	return !!(stat1 & MDIO_STAT1_LPOWERABLE);
 }

 /**
  * genphy_c45_pma_resume - wakes up the PMA module
  * @phydev: target phy_device struct
  */
 int genphy_c45_pma_resume(struct phy_device *phydev)
 {
 	if (!genphy_c45_pma_can_sleep(phydev))
 		return -EOPNOTSUPP;

 	return phy_clear_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1,
 				  MDIO_CTRL1_LPOWER);
 }
 EXPORT_SYMBOL_GPL(genphy_c45_pma_resume);

 /**
  * genphy_c45_pma_suspend - suspends the PMA module
  * @phydev: target phy_device struct
  */
 int genphy_c45_pma_suspend(struct phy_device *phydev)
 {
 	if (!genphy_c45_pma_can_sleep(phydev))
 		return -EOPNOTSUPP;

 	return phy_set_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1,
 				MDIO_CTRL1_LPOWER);
 }
 EXPORT_SYMBOL_GPL(genphy_c45_pma_suspend);

 /**
  * genphy_c45_pma_setup_forced - configures a forced speed
  * @phydev: target phy_device struct
  */
 int genphy_c45_pma_setup_forced(struct phy_device *phydev)
 {
 	int ctrl1, ctrl2, ret;

 	/* Half duplex is not supported */
 	if (phydev->duplex != DUPLEX_FULL)
 		return -EINVAL;

 	ctrl1 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
 	if (ctrl1 < 0)
 		return ctrl1;

 	ctrl2 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL2);
 	if (ctrl2 < 0)
 		return ctrl2;

 	ctrl1 &= ~MDIO_CTRL1_SPEEDSEL;
 	/*
 	 * PMA/PMD type selection is 1.7.5:0 not 1.7.3:0.  See 45.2.1.6.1
 	 * in 802.3-2012 and 802.3-2015.
 	 */
 	ctrl2 &= ~(MDIO_PMA_CTRL2_TYPE | 0x30);

 	switch (phydev->speed) {
 	case SPEED_10:
 		ctrl2 |= MDIO_PMA_CTRL2_10BT;
 		break;
 	case SPEED_100:
 		ctrl1 |= MDIO_PMA_CTRL1_SPEED100;
 		ctrl2 |= MDIO_PMA_CTRL2_100BTX;
 		break;
 	case SPEED_1000:
 		ctrl1 |= MDIO_PMA_CTRL1_SPEED1000;
 		/* Assume 1000base-T */
 		ctrl2 |= MDIO_PMA_CTRL2_1000BT;
 		break;
 	case SPEED_2500:
 		ctrl1 |= MDIO_CTRL1_SPEED2_5G;
 		/* Assume 2.5Gbase-T */
 		ctrl2 |= MDIO_PMA_CTRL2_2_5GBT;
 		break;
 	case SPEED_5000:
 		ctrl1 |= MDIO_CTRL1_SPEED5G;
 		/* Assume 5Gbase-T */
 		ctrl2 |= MDIO_PMA_CTRL2_5GBT;
 		break;
 	case SPEED_10000:
 		ctrl1 |= MDIO_CTRL1_SPEED10G;
 		/* Assume 10Gbase-T */
 		ctrl2 |= MDIO_PMA_CTRL2_10GBT;
 		break;
 	default:
 		return -EINVAL;
 	}

 	ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1, ctrl1);
 	if (ret < 0)
 		return ret;

 	ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL2, ctrl2);
 	if (ret < 0)
 		return ret;

 	return genphy_c45_an_disable_aneg(phydev);
 }
 EXPORT_SYMBOL_GPL(genphy_c45_pma_setup_forced);

 /**
  * genphy_c45_an_config_aneg - configure advertisement registers
  * @phydev: target phy_device struct
  *
  * Configure advertisement registers based on modes set in phydev->advertising
  *
  * Returns negative errno code on failure, 0 if advertisement didn't change,
  * or 1 if advertised modes changed.
  */
 int genphy_c45_an_config_aneg(struct phy_device *phydev)
 {
 	int changed, ret;
 	u32 adv;

 	linkmode_and(phydev->advertising, phydev->advertising,
 		     phydev->supported);

 	changed = genphy_config_eee_advert(phydev);

 	adv = linkmode_adv_to_mii_adv_t(phydev->advertising);

 	ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_ADVERTISE,
 				     ADVERTISE_ALL | ADVERTISE_100BASE4 |
 				     ADVERTISE_PAUSE_CAP | ADVERTISE_PAUSE_ASYM,
 				     adv);
 	if (ret < 0)
 		return ret;
 	if (ret > 0)
 		changed = 1;

 	adv = linkmode_adv_to_mii_10gbt_adv_t(phydev->advertising);

 	ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_CTRL,
 				     MDIO_AN_10GBT_CTRL_ADV10G |
 				     MDIO_AN_10GBT_CTRL_ADV5G |
 				     MDIO_AN_10GBT_CTRL_ADV2_5G, adv);
 	if (ret < 0)
 		return ret;
 	if (ret > 0)
 		changed = 1;

 	return changed;
 }
 EXPORT_SYMBOL_GPL(genphy_c45_an_config_aneg);

 /**
  * genphy_c45_an_disable_aneg - disable auto-negotiation
  * @phydev: target phy_device struct
  *
  * Disable auto-negotiation in the Clause 45 PHY. The link parameters
  * are controlled through the PMA/PMD MMD registers.
  *
  * Returns zero on success, negative errno code on failure.
  */
 int genphy_c45_an_disable_aneg(struct phy_device *phydev)
 {

 	return phy_clear_bits_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1,
 				  MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART);
 }
 EXPORT_SYMBOL_GPL(genphy_c45_an_disable_aneg);

 /**
  * genphy_c45_restart_aneg - Enable and restart auto-negotiation
  * @phydev: target phy_device struct
  *
  * This assumes that the auto-negotiation MMD is present.
  *
  * Enable and restart auto-negotiation.
  */
 int genphy_c45_restart_aneg(struct phy_device *phydev)
 {
 	return phy_set_bits_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1,
 				MDIO_AN_CTRL1_ENABLE | MDIO_AN_CTRL1_RESTART);
 }
 EXPORT_SYMBOL_GPL(genphy_c45_restart_aneg);

 /**
  * genphy_c45_check_and_restart_aneg - Enable and restart auto-negotiation
  * @phydev: target phy_device struct
  * @restart: whether aneg restart is requested
  *
  * This assumes that the auto-negotiation MMD is present.
  *
  * Check, and restart auto-negotiation if needed.
  */
 int genphy_c45_check_and_restart_aneg(struct phy_device *phydev, bool restart)
 {
 	int ret;

 	if (!restart) {
 		/* Configure and restart aneg if it wasn't set before */
 		ret = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
 		if (ret < 0)
 			return ret;

 		if (!(ret & MDIO_AN_CTRL1_ENABLE))
 			restart = true;
 	}

 	if (restart)
 		return genphy_c45_restart_aneg(phydev);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(genphy_c45_check_and_restart_aneg);

 /**
  * genphy_c45_aneg_done - return auto-negotiation complete status
  * @phydev: target phy_device struct
  *
  * This assumes that the auto-negotiation MMD is present.
  *
  * Reads the status register from the auto-negotiation MMD, returning:
  * - positive if auto-negotiation is complete
  * - negative errno code on error
  * - zero otherwise
  */
 int genphy_c45_aneg_done(struct phy_device *phydev)
 {
 	int val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);

 	return val < 0 ? val : val & MDIO_AN_STAT1_COMPLETE ? 1 : 0;
 }
 EXPORT_SYMBOL_GPL(genphy_c45_aneg_done);

 /**
  * genphy_c45_read_link - read the overall link status from the MMDs
  * @phydev: target phy_device struct
  *
  * Read the link status from the specified MMDs, and if they all indicate
  * that the link is up, set phydev->link to 1.  If an error is encountered,
  * a negative errno will be returned, otherwise zero.
  */
 int genphy_c45_read_link(struct phy_device *phydev)
 {
 	u32 mmd_mask = MDIO_DEVS_PMAPMD;
 	int val, devad;
 	bool link = true;

 	if (phydev->c45_ids.mmds_present & MDIO_DEVS_AN) {
 		val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
 		if (val < 0)
 			return val;

 		/* Autoneg is being started, therefore disregard current
 		 * link status and report link as down.
 		 */
 		if (val & MDIO_AN_CTRL1_RESTART) {
 			phydev->link = 0;
 			return 0;
 		}
 	}

 	while (mmd_mask && link) {
 		devad = __ffs(mmd_mask);
 		mmd_mask &= ~BIT(devad);

 		/* The link state is latched low so that momentary link
 		 * drops can be detected. Do not double-read the status
 		 * in polling mode to detect such short link drops except
 		 * the link was already down.
 		 */
 		if (!phy_polling_mode(phydev) || !phydev->link) {
 			val = phy_read_mmd(phydev, devad, MDIO_STAT1);
 			if (val < 0)
 				return val;
 			else if (val & MDIO_STAT1_LSTATUS)
 				continue;
 		}

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

 		if (!(val & MDIO_STAT1_LSTATUS))
 			link = false;
 	}

 	phydev->link = link;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(genphy_c45_read_link);

 /**
  * genphy_c45_read_lpa - read the link partner advertisement and pause
  * @phydev: target phy_device struct
  *
  * Read the Clause 45 defined base (7.19) and 10G (7.33) status registers,
  * filling in the link partner advertisement, pause and asym_pause members
  * in @phydev.  This assumes that the auto-negotiation MMD is present, and
  * the backplane bit (7.48.0) is clear.  Clause 45 PHY drivers are expected
  * to fill in the remainder of the link partner advert from vendor registers.
  */
 int genphy_c45_read_lpa(struct phy_device *phydev)
 {
 	int val;

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

 	if (!(val & MDIO_AN_STAT1_COMPLETE)) {
 		linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 				   phydev->lp_advertising);
 		mii_10gbt_stat_mod_linkmode_lpa_t(phydev->lp_advertising, 0);
 		mii_adv_mod_linkmode_adv_t(phydev->lp_advertising, 0);
 		phydev->pause = 0;
 		phydev->asym_pause = 0;

 		return 0;
 	}

 	linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->lp_advertising,
 			 val & MDIO_AN_STAT1_LPABLE);

 	/* Read the link partner's base page advertisement */
 	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_LPA);
 	if (val < 0)
 		return val;

 	mii_adv_mod_linkmode_adv_t(phydev->lp_advertising, val);
 	phydev->pause = val & LPA_PAUSE_CAP ? 1 : 0;
 	phydev->asym_pause = val & LPA_PAUSE_ASYM ? 1 : 0;

 	/* Read the link partner's 10G advertisement */
 	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_STAT);
 	if (val < 0)
 		return val;

 	mii_10gbt_stat_mod_linkmode_lpa_t(phydev->lp_advertising, val);

 	return 0;
 }
 EXPORT_SYMBOL_GPL(genphy_c45_read_lpa);

 /**
  * genphy_c45_read_pma - read link speed etc from PMA
  * @phydev: target phy_device struct
  */
 int genphy_c45_read_pma(struct phy_device *phydev)
 {
 	int val;

 	linkmode_zero(phydev->lp_advertising);

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

 	switch (val & MDIO_CTRL1_SPEEDSEL) {
 	case 0:
 		phydev->speed = SPEED_10;
 		break;
 	case MDIO_PMA_CTRL1_SPEED100:
 		phydev->speed = SPEED_100;
 		break;
 	case MDIO_PMA_CTRL1_SPEED1000:
 		phydev->speed = SPEED_1000;
 		break;
 	case MDIO_CTRL1_SPEED2_5G:
 		phydev->speed = SPEED_2500;
 		break;
 	case MDIO_CTRL1_SPEED5G:
 		phydev->speed = SPEED_5000;
 		break;
 	case MDIO_CTRL1_SPEED10G:
 		phydev->speed = SPEED_10000;
 		break;
 	default:
 		phydev->speed = SPEED_UNKNOWN;
 		break;
 	}

 	phydev->duplex = DUPLEX_FULL;

 	return 0;
 }
 EXPORT_SYMBOL_GPL(genphy_c45_read_pma);

 /**
  * genphy_c45_read_mdix - read mdix status from PMA
  * @phydev: target phy_device struct
  */
 int genphy_c45_read_mdix(struct phy_device *phydev)
 {
 	int val;

 	if (phydev->speed == SPEED_10000) {
 		val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD,
 				   MDIO_PMA_10GBT_SWAPPOL);
 		if (val < 0)
 			return val;

 		switch (val) {
 		case MDIO_PMA_10GBT_SWAPPOL_ABNX | MDIO_PMA_10GBT_SWAPPOL_CDNX:
 			phydev->mdix = ETH_TP_MDI;
 			break;

 		case 0:
 			phydev->mdix = ETH_TP_MDI_X;
 			break;

 		default:
 			phydev->mdix = ETH_TP_MDI_INVALID;
 			break;
 		}
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(genphy_c45_read_mdix);

 /**
  * genphy_c45_pma_read_abilities - read supported link modes from PMA
  * @phydev: target phy_device struct
  *
  * Read the supported link modes from the PMA Status 2 (1.8) register. If bit
  * 1.8.9 is set, the list of supported modes is build using the values in the
  * PMA Extended Abilities (1.11) register, indicating 1000BASET an 10G related
  * modes. If bit 1.11.14 is set, then the list is also extended with the modes
  * in the 2.5G/5G PMA Extended register (1.21), indicating if 2.5GBASET and
  * 5GBASET are supported.
  */
 int genphy_c45_pma_read_abilities(struct phy_device *phydev)
 {
 	int val;

 	linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported);
 	if (phydev->c45_ids.mmds_present & MDIO_DEVS_AN) {
 		val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
 		if (val < 0)
 			return val;

 		if (val & MDIO_AN_STAT1_ABLE)
 			linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
 					 phydev->supported);
 	}

 	val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_STAT2);
 	if (val < 0)
 		return val;

 	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseSR_Full_BIT,
 			 phydev->supported,
 			 val & MDIO_PMA_STAT2_10GBSR);

 	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseLR_Full_BIT,
 			 phydev->supported,
 			 val & MDIO_PMA_STAT2_10GBLR);

 	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseER_Full_BIT,
 			 phydev->supported,
 			 val & MDIO_PMA_STAT2_10GBER);

 	if (val & MDIO_PMA_STAT2_EXTABLE) {
 		val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_EXTABLE);
 		if (val < 0)
 			return val;

 		linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseLRM_Full_BIT,
 				 phydev->supported,
 				 val & MDIO_PMA_EXTABLE_10GBLRM);
 		linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
 				 phydev->supported,
 				 val & MDIO_PMA_EXTABLE_10GBT);
 		linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
 				 phydev->supported,
 				 val & MDIO_PMA_EXTABLE_10GBKX4);
 		linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
 				 phydev->supported,
 				 val & MDIO_PMA_EXTABLE_10GBKR);
 		linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
 				 phydev->supported,
 				 val & MDIO_PMA_EXTABLE_1000BT);
 		linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
 				 phydev->supported,
 				 val & MDIO_PMA_EXTABLE_1000BKX);

 		linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
 				 phydev->supported,
 				 val & MDIO_PMA_EXTABLE_100BTX);
 		linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
 				 phydev->supported,
 				 val & MDIO_PMA_EXTABLE_100BTX);

 		linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
 				 phydev->supported,
 				 val & MDIO_PMA_EXTABLE_10BT);
 		linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
 				 phydev->supported,
 				 val & MDIO_PMA_EXTABLE_10BT);

 		if (val & MDIO_PMA_EXTABLE_NBT) {
 			val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD,
 					   MDIO_PMA_NG_EXTABLE);
 			if (val < 0)
 				return val;

 			linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
 					 phydev->supported,
 					 val & MDIO_PMA_NG_EXTABLE_2_5GBT);

 			linkmode_mod_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
 					 phydev->supported,
 					 val & MDIO_PMA_NG_EXTABLE_5GBT);
 		}
 	}

 	return 0;
 }
 EXPORT_SYMBOL_GPL(genphy_c45_pma_read_abilities);

 /**
  * genphy_c45_read_status - read PHY status
  * @phydev: target phy_device struct
  *
  * Reads status from PHY and sets phy_device members accordingly.
  */
 int genphy_c45_read_status(struct phy_device *phydev)
 {
 	int ret;

 	ret = genphy_c45_read_link(phydev);
 	if (ret)
 		return ret;

 	phydev->speed = SPEED_UNKNOWN;
 	phydev->duplex = DUPLEX_UNKNOWN;
 	phydev->pause = 0;
 	phydev->asym_pause = 0;

 	if (phydev->autoneg == AUTONEG_ENABLE) {
 		ret = genphy_c45_read_lpa(phydev);
 		if (ret)
 			return ret;

 		phy_resolve_aneg_linkmode(phydev);
 	} else {
 		ret = genphy_c45_read_pma(phydev);
 	}

 	return ret;
 }
 EXPORT_SYMBOL_GPL(genphy_c45_read_status);

 /**
  * genphy_c45_config_aneg - restart auto-negotiation or forced setup
  * @phydev: target phy_device struct
  *
  * Description: If auto-negotiation is enabled, we configure the
  *   advertising, and then restart auto-negotiation.  If it is not
  *   enabled, then we force a configuration.
  */
 int genphy_c45_config_aneg(struct phy_device *phydev)
 {
 	bool changed = false;
 	int ret;

 	if (phydev->autoneg == AUTONEG_DISABLE)
 		return genphy_c45_pma_setup_forced(phydev);

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

 	return genphy_c45_check_and_restart_aneg(phydev, changed);
 }
 EXPORT_SYMBOL_GPL(genphy_c45_config_aneg);

 /* The gen10g_* functions are the old Clause 45 stub */

 int gen10g_config_aneg(struct phy_device *phydev)
 {
 	return 0;
 }
 EXPORT_SYMBOL_GPL(gen10g_config_aneg);

 int genphy_c45_loopback(struct phy_device *phydev, bool enable)
 {
 	return phy_modify_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
 			      MDIO_PCS_CTRL1_LOOPBACK,
 			      enable ? MDIO_PCS_CTRL1_LOOPBACK : 0);
 }
 EXPORT_SYMBOL_GPL(genphy_c45_loopback);

 /**
  * genphy_c45_fast_retrain - configure fast retrain registers
  * @phydev: target phy_device struct
  * @enable: enable fast retrain or not
  *
  * Description: If fast-retrain is enabled, we configure PHY as
  *   advertising fast retrain capable and THP Bypass Request, then
  *   enable fast retrain. If it is not enabled, we configure fast
  *   retrain disabled.
  */
 int genphy_c45_fast_retrain(struct phy_device *phydev, bool enable)
 {
 	int ret;

 	if (!enable)
 		return phy_clear_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_10GBR_FSRT_CSR,
 				MDIO_PMA_10GBR_FSRT_ENABLE);

 	if (linkmode_test_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, phydev->supported)) {
 		ret = phy_set_bits_mmd(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_CTRL,
 				MDIO_AN_10GBT_CTRL_ADVFSRT2_5G);
 		if (ret)
 			return ret;

 		ret = phy_set_bits_mmd(phydev, MDIO_MMD_AN, MDIO_AN_CTRL2,
 				MDIO_AN_THP_BP2_5GT);
 		if (ret)
 			return ret;
 	}

 	return phy_set_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_10GBR_FSRT_CSR,
 			MDIO_PMA_10GBR_FSRT_ENABLE);
 }
 EXPORT_SYMBOL_GPL(genphy_c45_fast_retrain);

 struct phy_driver genphy_c45_driver = {
 	.phy_id         = 0xffffffff,
 	.phy_id_mask    = 0xffffffff,
 	.name           = "Generic Clause 45 PHY",
 	.read_status    = genphy_c45_read_status,
 };
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Clause 45 PHY support
	*/
	#include <linux/ethtool.h>
	#include <linux/export.h>
	#include <linux/mdio.h>
	#include <linux/mii.h>
	#include <linux/phy.h>

	/**
	* genphy_c45_pma_can_sleep - checks if the PMA have sleep support
	* @phydev: target phy_device struct
	*/
	static bool genphy_c45_pma_can_sleep(struct phy_device *phydev)
	{
	int stat1;

	stat1 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_STAT1);
	if (stat1 < 0)
	return false;

	return !!(stat1 & MDIO_STAT1_LPOWERABLE);
	}

	/**
	* genphy_c45_pma_resume - wakes up the PMA module
	* @phydev: target phy_device struct
	*/
	int genphy_c45_pma_resume(struct phy_device *phydev)
	{
	if (!genphy_c45_pma_can_sleep(phydev))
	return -EOPNOTSUPP;

	return phy_clear_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1,
	MDIO_CTRL1_LPOWER);
	}
	EXPORT_SYMBOL_GPL(genphy_c45_pma_resume);

	/**
	* genphy_c45_pma_suspend - suspends the PMA module
	* @phydev: target phy_device struct
	*/
	int genphy_c45_pma_suspend(struct phy_device *phydev)
	{
	if (!genphy_c45_pma_can_sleep(phydev))
	return -EOPNOTSUPP;

	return phy_set_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1,
	MDIO_CTRL1_LPOWER);
	}
	EXPORT_SYMBOL_GPL(genphy_c45_pma_suspend);

	/**
	* genphy_c45_pma_setup_forced - configures a forced speed
	* @phydev: target phy_device struct
	*/
	int genphy_c45_pma_setup_forced(struct phy_device *phydev)
	{
	int ctrl1, ctrl2, ret;

	/* Half duplex is not supported */
	if (phydev->duplex != DUPLEX_FULL)
	return -EINVAL;

	ctrl1 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1);
	if (ctrl1 < 0)
	return ctrl1;

	ctrl2 = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL2);
	if (ctrl2 < 0)
	return ctrl2;

	ctrl1 &= ~MDIO_CTRL1_SPEEDSEL;
	/*
	* PMA/PMD type selection is 1.7.5:0 not 1.7.3:0. See 45.2.1.6.1
	* in 802.3-2012 and 802.3-2015.
	*/
	ctrl2 &= ~(MDIO_PMA_CTRL2_TYPE \| 0x30);

	switch (phydev->speed) {
	case SPEED_10:
	ctrl2 \|= MDIO_PMA_CTRL2_10BT;
	break;
	case SPEED_100:
	ctrl1 \|= MDIO_PMA_CTRL1_SPEED100;
	ctrl2 \|= MDIO_PMA_CTRL2_100BTX;
	break;
	case SPEED_1000:
	ctrl1 \|= MDIO_PMA_CTRL1_SPEED1000;
	/* Assume 1000base-T */
	ctrl2 \|= MDIO_PMA_CTRL2_1000BT;
	break;
	case SPEED_2500:
	ctrl1 \|= MDIO_CTRL1_SPEED2_5G;
	/* Assume 2.5Gbase-T */
	ctrl2 \|= MDIO_PMA_CTRL2_2_5GBT;
	break;
	case SPEED_5000:
	ctrl1 \|= MDIO_CTRL1_SPEED5G;
	/* Assume 5Gbase-T */
	ctrl2 \|= MDIO_PMA_CTRL2_5GBT;
	break;
	case SPEED_10000:
	ctrl1 \|= MDIO_CTRL1_SPEED10G;
	/* Assume 10Gbase-T */
	ctrl2 \|= MDIO_PMA_CTRL2_10GBT;
	break;
	default:
	return -EINVAL;
	}

	ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL1, ctrl1);
	if (ret < 0)
	return ret;

	ret = phy_write_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_CTRL2, ctrl2);
	if (ret < 0)
	return ret;

	return genphy_c45_an_disable_aneg(phydev);
	}
	EXPORT_SYMBOL_GPL(genphy_c45_pma_setup_forced);

	/**
	* genphy_c45_an_config_aneg - configure advertisement registers
	* @phydev: target phy_device struct
	*
	* Configure advertisement registers based on modes set in phydev->advertising
	*
	* Returns negative errno code on failure, 0 if advertisement didn't change,
	* or 1 if advertised modes changed.
	*/
	int genphy_c45_an_config_aneg(struct phy_device *phydev)
	{
	int changed, ret;
	u32 adv;

	linkmode_and(phydev->advertising, phydev->advertising,
	phydev->supported);

	changed = genphy_config_eee_advert(phydev);

	adv = linkmode_adv_to_mii_adv_t(phydev->advertising);

	ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_ADVERTISE,
	ADVERTISE_ALL \| ADVERTISE_100BASE4 \|
	ADVERTISE_PAUSE_CAP \| ADVERTISE_PAUSE_ASYM,
	adv);
	if (ret < 0)
	return ret;
	if (ret > 0)
	changed = 1;

	adv = linkmode_adv_to_mii_10gbt_adv_t(phydev->advertising);

	ret = phy_modify_mmd_changed(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_CTRL,
	MDIO_AN_10GBT_CTRL_ADV10G \|
	MDIO_AN_10GBT_CTRL_ADV5G \|
	MDIO_AN_10GBT_CTRL_ADV2_5G, adv);
	if (ret < 0)
	return ret;
	if (ret > 0)
	changed = 1;

	return changed;
	}
	EXPORT_SYMBOL_GPL(genphy_c45_an_config_aneg);

	/**
	* genphy_c45_an_disable_aneg - disable auto-negotiation
	* @phydev: target phy_device struct
	*
	* Disable auto-negotiation in the Clause 45 PHY. The link parameters
	* are controlled through the PMA/PMD MMD registers.
	*
	* Returns zero on success, negative errno code on failure.
	*/
	int genphy_c45_an_disable_aneg(struct phy_device *phydev)
	{

	return phy_clear_bits_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1,
	MDIO_AN_CTRL1_ENABLE \| MDIO_AN_CTRL1_RESTART);
	}
	EXPORT_SYMBOL_GPL(genphy_c45_an_disable_aneg);

	/**
	* genphy_c45_restart_aneg - Enable and restart auto-negotiation
	* @phydev: target phy_device struct
	*
	* This assumes that the auto-negotiation MMD is present.
	*
	* Enable and restart auto-negotiation.
	*/
	int genphy_c45_restart_aneg(struct phy_device *phydev)
	{
	return phy_set_bits_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1,
	MDIO_AN_CTRL1_ENABLE \| MDIO_AN_CTRL1_RESTART);
	}
	EXPORT_SYMBOL_GPL(genphy_c45_restart_aneg);

	/**
	* genphy_c45_check_and_restart_aneg - Enable and restart auto-negotiation
	* @phydev: target phy_device struct
	* @restart: whether aneg restart is requested
	*
	* This assumes that the auto-negotiation MMD is present.
	*
	* Check, and restart auto-negotiation if needed.
	*/
	int genphy_c45_check_and_restart_aneg(struct phy_device *phydev, bool restart)
	{
	int ret;

	if (!restart) {
	/* Configure and restart aneg if it wasn't set before */
	ret = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
	if (ret < 0)
	return ret;

	if (!(ret & MDIO_AN_CTRL1_ENABLE))
	restart = true;
	}

	if (restart)
	return genphy_c45_restart_aneg(phydev);

	return 0;
	}
	EXPORT_SYMBOL_GPL(genphy_c45_check_and_restart_aneg);

	/**
	* genphy_c45_aneg_done - return auto-negotiation complete status
	* @phydev: target phy_device struct
	*
	* This assumes that the auto-negotiation MMD is present.
	*
	* Reads the status register from the auto-negotiation MMD, returning:
	* - positive if auto-negotiation is complete
	* - negative errno code on error
	* - zero otherwise
	*/
	int genphy_c45_aneg_done(struct phy_device *phydev)
	{
	int val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);

	return val < 0 ? val : val & MDIO_AN_STAT1_COMPLETE ? 1 : 0;
	}
	EXPORT_SYMBOL_GPL(genphy_c45_aneg_done);

	/**
	* genphy_c45_read_link - read the overall link status from the MMDs
	* @phydev: target phy_device struct
	*
	* Read the link status from the specified MMDs, and if they all indicate
	* that the link is up, set phydev->link to 1. If an error is encountered,
	* a negative errno will be returned, otherwise zero.
	*/
	int genphy_c45_read_link(struct phy_device *phydev)
	{
	u32 mmd_mask = MDIO_DEVS_PMAPMD;
	int val, devad;
	bool link = true;

	if (phydev->c45_ids.mmds_present & MDIO_DEVS_AN) {
	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_CTRL1);
	if (val < 0)
	return val;

	/* Autoneg is being started, therefore disregard current
	* link status and report link as down.
	*/
	if (val & MDIO_AN_CTRL1_RESTART) {
	phydev->link = 0;
	return 0;
	}
	}

	while (mmd_mask && link) {
	devad = __ffs(mmd_mask);
	mmd_mask &= ~BIT(devad);

	/* The link state is latched low so that momentary link
	* drops can be detected. Do not double-read the status
	* in polling mode to detect such short link drops except
	* the link was already down.
	*/
	if (!phy_polling_mode(phydev) \|\| !phydev->link) {
	val = phy_read_mmd(phydev, devad, MDIO_STAT1);
	if (val < 0)
	return val;
	else if (val & MDIO_STAT1_LSTATUS)
	continue;
	}

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

	if (!(val & MDIO_STAT1_LSTATUS))
	link = false;
	}

	phydev->link = link;

	return 0;
	}
	EXPORT_SYMBOL_GPL(genphy_c45_read_link);

	/**
	* genphy_c45_read_lpa - read the link partner advertisement and pause
	* @phydev: target phy_device struct
	*
	* Read the Clause 45 defined base (7.19) and 10G (7.33) status registers,
	* filling in the link partner advertisement, pause and asym_pause members
	* in @phydev. This assumes that the auto-negotiation MMD is present, and
	* the backplane bit (7.48.0) is clear. Clause 45 PHY drivers are expected
	* to fill in the remainder of the link partner advert from vendor registers.
	*/
	int genphy_c45_read_lpa(struct phy_device *phydev)
	{
	int val;

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

	if (!(val & MDIO_AN_STAT1_COMPLETE)) {
	linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
	phydev->lp_advertising);
	mii_10gbt_stat_mod_linkmode_lpa_t(phydev->lp_advertising, 0);
	mii_adv_mod_linkmode_adv_t(phydev->lp_advertising, 0);
	phydev->pause = 0;
	phydev->asym_pause = 0;

	return 0;
	}

	linkmode_mod_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->lp_advertising,
	val & MDIO_AN_STAT1_LPABLE);

	/* Read the link partner's base page advertisement */
	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_LPA);
	if (val < 0)
	return val;

	mii_adv_mod_linkmode_adv_t(phydev->lp_advertising, val);
	phydev->pause = val & LPA_PAUSE_CAP ? 1 : 0;
	phydev->asym_pause = val & LPA_PAUSE_ASYM ? 1 : 0;

	/* Read the link partner's 10G advertisement */
	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_STAT);
	if (val < 0)
	return val;

	mii_10gbt_stat_mod_linkmode_lpa_t(phydev->lp_advertising, val);

	return 0;
	}
	EXPORT_SYMBOL_GPL(genphy_c45_read_lpa);

	/**
	* genphy_c45_read_pma - read link speed etc from PMA
	* @phydev: target phy_device struct
	*/
	int genphy_c45_read_pma(struct phy_device *phydev)
	{
	int val;

	linkmode_zero(phydev->lp_advertising);

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

	switch (val & MDIO_CTRL1_SPEEDSEL) {
	case 0:
	phydev->speed = SPEED_10;
	break;
	case MDIO_PMA_CTRL1_SPEED100:
	phydev->speed = SPEED_100;
	break;
	case MDIO_PMA_CTRL1_SPEED1000:
	phydev->speed = SPEED_1000;
	break;
	case MDIO_CTRL1_SPEED2_5G:
	phydev->speed = SPEED_2500;
	break;
	case MDIO_CTRL1_SPEED5G:
	phydev->speed = SPEED_5000;
	break;
	case MDIO_CTRL1_SPEED10G:
	phydev->speed = SPEED_10000;
	break;
	default:
	phydev->speed = SPEED_UNKNOWN;
	break;
	}

	phydev->duplex = DUPLEX_FULL;

	return 0;
	}
	EXPORT_SYMBOL_GPL(genphy_c45_read_pma);

	/**
	* genphy_c45_read_mdix - read mdix status from PMA
	* @phydev: target phy_device struct
	*/
	int genphy_c45_read_mdix(struct phy_device *phydev)
	{
	int val;

	if (phydev->speed == SPEED_10000) {
	val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD,
	MDIO_PMA_10GBT_SWAPPOL);
	if (val < 0)
	return val;

	switch (val) {
	case MDIO_PMA_10GBT_SWAPPOL_ABNX \| MDIO_PMA_10GBT_SWAPPOL_CDNX:
	phydev->mdix = ETH_TP_MDI;
	break;

	case 0:
	phydev->mdix = ETH_TP_MDI_X;
	break;

	default:
	phydev->mdix = ETH_TP_MDI_INVALID;
	break;
	}
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(genphy_c45_read_mdix);

	/**
	* genphy_c45_pma_read_abilities - read supported link modes from PMA
	* @phydev: target phy_device struct
	*
	* Read the supported link modes from the PMA Status 2 (1.8) register. If bit
	* 1.8.9 is set, the list of supported modes is build using the values in the
	* PMA Extended Abilities (1.11) register, indicating 1000BASET an 10G related
	* modes. If bit 1.11.14 is set, then the list is also extended with the modes
	* in the 2.5G/5G PMA Extended register (1.21), indicating if 2.5GBASET and
	* 5GBASET are supported.
	*/
	int genphy_c45_pma_read_abilities(struct phy_device *phydev)
	{
	int val;

	linkmode_clear_bit(ETHTOOL_LINK_MODE_Autoneg_BIT, phydev->supported);
	if (phydev->c45_ids.mmds_present & MDIO_DEVS_AN) {
	val = phy_read_mmd(phydev, MDIO_MMD_AN, MDIO_STAT1);
	if (val < 0)
	return val;

	if (val & MDIO_AN_STAT1_ABLE)
	linkmode_set_bit(ETHTOOL_LINK_MODE_Autoneg_BIT,
	phydev->supported);
	}

	val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_STAT2);
	if (val < 0)
	return val;

	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseSR_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_STAT2_10GBSR);

	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseLR_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_STAT2_10GBLR);

	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseER_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_STAT2_10GBER);

	if (val & MDIO_PMA_STAT2_EXTABLE) {
	val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_EXTABLE);
	if (val < 0)
	return val;

	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseLRM_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_EXTABLE_10GBLRM);
	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseT_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_EXTABLE_10GBT);
	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseKX4_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_EXTABLE_10GBKX4);
	linkmode_mod_bit(ETHTOOL_LINK_MODE_10000baseKR_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_EXTABLE_10GBKR);
	linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseT_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_EXTABLE_1000BT);
	linkmode_mod_bit(ETHTOOL_LINK_MODE_1000baseKX_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_EXTABLE_1000BKX);

	linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_EXTABLE_100BTX);
	linkmode_mod_bit(ETHTOOL_LINK_MODE_100baseT_Half_BIT,
	phydev->supported,
	val & MDIO_PMA_EXTABLE_100BTX);

	linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_EXTABLE_10BT);
	linkmode_mod_bit(ETHTOOL_LINK_MODE_10baseT_Half_BIT,
	phydev->supported,
	val & MDIO_PMA_EXTABLE_10BT);

	if (val & MDIO_PMA_EXTABLE_NBT) {
	val = phy_read_mmd(phydev, MDIO_MMD_PMAPMD,
	MDIO_PMA_NG_EXTABLE);
	if (val < 0)
	return val;

	linkmode_mod_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_NG_EXTABLE_2_5GBT);

	linkmode_mod_bit(ETHTOOL_LINK_MODE_5000baseT_Full_BIT,
	phydev->supported,
	val & MDIO_PMA_NG_EXTABLE_5GBT);
	}
	}

	return 0;
	}
	EXPORT_SYMBOL_GPL(genphy_c45_pma_read_abilities);

	/**
	* genphy_c45_read_status - read PHY status
	* @phydev: target phy_device struct
	*
	* Reads status from PHY and sets phy_device members accordingly.
	*/
	int genphy_c45_read_status(struct phy_device *phydev)
	{
	int ret;

	ret = genphy_c45_read_link(phydev);
	if (ret)
	return ret;

	phydev->speed = SPEED_UNKNOWN;
	phydev->duplex = DUPLEX_UNKNOWN;
	phydev->pause = 0;
	phydev->asym_pause = 0;

	if (phydev->autoneg == AUTONEG_ENABLE) {
	ret = genphy_c45_read_lpa(phydev);
	if (ret)
	return ret;

	phy_resolve_aneg_linkmode(phydev);
	} else {
	ret = genphy_c45_read_pma(phydev);
	}

	return ret;
	}
	EXPORT_SYMBOL_GPL(genphy_c45_read_status);

	/**
	* genphy_c45_config_aneg - restart auto-negotiation or forced setup
	* @phydev: target phy_device struct
	*
	* Description: If auto-negotiation is enabled, we configure the
	* advertising, and then restart auto-negotiation. If it is not
	* enabled, then we force a configuration.
	*/
	int genphy_c45_config_aneg(struct phy_device *phydev)
	{
	bool changed = false;
	int ret;

	if (phydev->autoneg == AUTONEG_DISABLE)
	return genphy_c45_pma_setup_forced(phydev);

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

	return genphy_c45_check_and_restart_aneg(phydev, changed);
	}
	EXPORT_SYMBOL_GPL(genphy_c45_config_aneg);

	/* The gen10g_* functions are the old Clause 45 stub */

	int gen10g_config_aneg(struct phy_device *phydev)
	{
	return 0;
	}
	EXPORT_SYMBOL_GPL(gen10g_config_aneg);

	int genphy_c45_loopback(struct phy_device *phydev, bool enable)
	{
	return phy_modify_mmd(phydev, MDIO_MMD_PCS, MDIO_CTRL1,
	MDIO_PCS_CTRL1_LOOPBACK,
	enable ? MDIO_PCS_CTRL1_LOOPBACK : 0);
	}
	EXPORT_SYMBOL_GPL(genphy_c45_loopback);

	/**
	* genphy_c45_fast_retrain - configure fast retrain registers
	* @phydev: target phy_device struct
	* @enable: enable fast retrain or not
	*
	* Description: If fast-retrain is enabled, we configure PHY as
	* advertising fast retrain capable and THP Bypass Request, then
	* enable fast retrain. If it is not enabled, we configure fast
	* retrain disabled.
	*/
	int genphy_c45_fast_retrain(struct phy_device *phydev, bool enable)
	{
	int ret;

	if (!enable)
	return phy_clear_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_10GBR_FSRT_CSR,
	MDIO_PMA_10GBR_FSRT_ENABLE);

	if (linkmode_test_bit(ETHTOOL_LINK_MODE_2500baseT_Full_BIT, phydev->supported)) {
	ret = phy_set_bits_mmd(phydev, MDIO_MMD_AN, MDIO_AN_10GBT_CTRL,
	MDIO_AN_10GBT_CTRL_ADVFSRT2_5G);
	if (ret)
	return ret;

	ret = phy_set_bits_mmd(phydev, MDIO_MMD_AN, MDIO_AN_CTRL2,
	MDIO_AN_THP_BP2_5GT);
	if (ret)
	return ret;
	}

	return phy_set_bits_mmd(phydev, MDIO_MMD_PMAPMD, MDIO_PMA_10GBR_FSRT_CSR,
	MDIO_PMA_10GBR_FSRT_ENABLE);
	}
	EXPORT_SYMBOL_GPL(genphy_c45_fast_retrain);

	struct phy_driver genphy_c45_driver = {
	.phy_id = 0xffffffff,
	.phy_id_mask = 0xffffffff,
	.name = "Generic Clause 45 PHY",
	.read_status = genphy_c45_read_status,
	};