drivers/net/sfc/mdio_10g.c - linux/kernel/git/mellanox/linux - Git at Google

 /****************************************************************************
  * Driver for Solarflare Solarstorm network controllers and boards
  * Copyright 2006-2008 Solarflare Communications Inc.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 as published
  * by the Free Software Foundation, incorporated herein by reference.
  */
 /*
  * Useful functions for working with MDIO clause 45 PHYs
  */
 #include <linux/types.h>
 #include <linux/ethtool.h>
 #include <linux/delay.h>
 #include "net_driver.h"
 #include "mdio_10g.h"
 #include "boards.h"

 int mdio_clause45_reset_mmd(struct efx_nic *port, int mmd,
 			    int spins, int spintime)
 {
 	u32 ctrl;
 	int phy_id = port->mii.phy_id;

 	/* Catch callers passing values in the wrong units (or just silly) */
 	EFX_BUG_ON_PARANOID(spins * spintime >= 5000);

 	mdio_clause45_write(port, phy_id, mmd, MDIO_MMDREG_CTRL1,
 			    (1 << MDIO_MMDREG_CTRL1_RESET_LBN));
 	/* Wait for the reset bit to clear. */
 	do {
 		msleep(spintime);
 		ctrl = mdio_clause45_read(port, phy_id, mmd, MDIO_MMDREG_CTRL1);
 		spins--;

 	} while (spins && (ctrl & (1 << MDIO_MMDREG_CTRL1_RESET_LBN)));

 	return spins ? spins : -ETIMEDOUT;
 }

 static int mdio_clause45_check_mmd(struct efx_nic *efx, int mmd,
 				   int fault_fatal)
 {
 	int status;
 	int phy_id = efx->mii.phy_id;

 	if (LOOPBACK_INTERNAL(efx))
 		return 0;

 	/* Read MMD STATUS2 to check it is responding. */
 	status = mdio_clause45_read(efx, phy_id, mmd, MDIO_MMDREG_STAT2);
 	if (((status >> MDIO_MMDREG_STAT2_PRESENT_LBN) &
 	     ((1 << MDIO_MMDREG_STAT2_PRESENT_WIDTH) - 1)) !=
 	    MDIO_MMDREG_STAT2_PRESENT_VAL) {
 		EFX_ERR(efx, "PHY MMD %d not responding.\n", mmd);
 		return -EIO;
 	}

 	/* Read MMD STATUS 1 to check for fault. */
 	status = mdio_clause45_read(efx, phy_id, mmd, MDIO_MMDREG_STAT1);
 	if ((status & (1 << MDIO_MMDREG_STAT1_FAULT_LBN)) != 0) {
 		if (fault_fatal) {
 			EFX_ERR(efx, "PHY MMD %d reporting fatal"
 				" fault: status %x\n", mmd, status);
 			return -EIO;
 		} else {
 			EFX_LOG(efx, "PHY MMD %d reporting status"
 				" %x (expected)\n", mmd, status);
 		}
 	}
 	return 0;
 }

 /* This ought to be ridiculous overkill. We expect it to fail rarely */
 #define MDIO45_RESET_TIME	1000 /* ms */
 #define MDIO45_RESET_ITERS	100

 int mdio_clause45_wait_reset_mmds(struct efx_nic *efx,
 				  unsigned int mmd_mask)
 {
 	const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
 	int tries = MDIO45_RESET_ITERS;
 	int rc = 0;
 	int in_reset;

 	while (tries) {
 		int mask = mmd_mask;
 		int mmd = 0;
 		int stat;
 		in_reset = 0;
 		while (mask) {
 			if (mask & 1) {
 				stat = mdio_clause45_read(efx,
 							  efx->mii.phy_id,
 							  mmd,
 							  MDIO_MMDREG_CTRL1);
 				if (stat < 0) {
 					EFX_ERR(efx, "failed to read status of"
 						" MMD %d\n", mmd);
 					return -EIO;
 				}
 				if (stat & (1 << MDIO_MMDREG_CTRL1_RESET_LBN))
 					in_reset |= (1 << mmd);
 			}
 			mask = mask >> 1;
 			mmd++;
 		}
 		if (!in_reset)
 			break;
 		tries--;
 		msleep(spintime);
 	}
 	if (in_reset != 0) {
 		EFX_ERR(efx, "not all MMDs came out of reset in time."
 			" MMDs still in reset: %x\n", in_reset);
 		rc = -ETIMEDOUT;
 	}
 	return rc;
 }

 int mdio_clause45_check_mmds(struct efx_nic *efx,
 			     unsigned int mmd_mask, unsigned int fatal_mask)
 {
 	int devices, mmd = 0;
 	int probe_mmd;

 	/* Historically we have probed the PHYXS to find out what devices are
 	 * present,but that doesn't work so well if the PHYXS isn't expected
 	 * to exist, if so just find the first item in the list supplied. */
 	probe_mmd = (mmd_mask & MDIO_MMDREG_DEVS0_PHYXS) ? MDIO_MMD_PHYXS :
 	    __ffs(mmd_mask);
 	devices = mdio_clause45_read(efx, efx->mii.phy_id,
 				     probe_mmd, MDIO_MMDREG_DEVS0);

 	/* Check all the expected MMDs are present */
 	if (devices < 0) {
 		EFX_ERR(efx, "failed to read devices present\n");
 		return -EIO;
 	}
 	if ((devices & mmd_mask) != mmd_mask) {
 		EFX_ERR(efx, "required MMDs not present: got %x, "
 			"wanted %x\n", devices, mmd_mask);
 		return -ENODEV;
 	}
 	EFX_TRACE(efx, "Devices present: %x\n", devices);

 	/* Check all required MMDs are responding and happy. */
 	while (mmd_mask) {
 		if (mmd_mask & 1) {
 			int fault_fatal = fatal_mask & 1;
 			if (mdio_clause45_check_mmd(efx, mmd, fault_fatal))
 				return -EIO;
 		}
 		mmd_mask = mmd_mask >> 1;
 		fatal_mask = fatal_mask >> 1;
 		mmd++;
 	}

 	return 0;
 }

 int mdio_clause45_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
 {
 	int phy_id = efx->mii.phy_id;
 	int status;
 	int ok = 1;
 	int mmd = 0;
 	int good;

 	/* If the port is in loopback, then we should only consider a subset
 	 * of mmd's */
 	if (LOOPBACK_INTERNAL(efx))
 		return 1;
 	else if (efx->loopback_mode == LOOPBACK_NETWORK)
 		return 0;
 	else if (efx->loopback_mode == LOOPBACK_PHYXS)
 		mmd_mask &= ~(MDIO_MMDREG_DEVS0_PHYXS |
 			      MDIO_MMDREG_DEVS0_PCS |
 			      MDIO_MMDREG_DEVS0_PMAPMD);
 	else if (efx->loopback_mode == LOOPBACK_PCS)
 		mmd_mask &= ~(MDIO_MMDREG_DEVS0_PCS |
 			      MDIO_MMDREG_DEVS0_PMAPMD);
 	else if (efx->loopback_mode == LOOPBACK_PMAPMD)
 		mmd_mask &= ~MDIO_MMDREG_DEVS0_PMAPMD;

 	while (mmd_mask) {
 		if (mmd_mask & 1) {
 			/* Double reads because link state is latched, and a
 			 * read moves the current state into the register */
 			status = mdio_clause45_read(efx, phy_id,
 						    mmd, MDIO_MMDREG_STAT1);
 			status = mdio_clause45_read(efx, phy_id,
 						    mmd, MDIO_MMDREG_STAT1);

 			good = status & (1 << MDIO_MMDREG_STAT1_LINK_LBN);
 			ok = ok && good;
 		}
 		mmd_mask = (mmd_mask >> 1);
 		mmd++;
 	}
 	return ok;
 }

 void mdio_clause45_transmit_disable(struct efx_nic *efx)
 {
 	int phy_id = efx->mii.phy_id;
 	int ctrl1, ctrl2;

 	ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PMAPMD,
 					   MDIO_MMDREG_TXDIS);
 	if (efx->tx_disabled)
 		ctrl2 |= (1 << MDIO_MMDREG_TXDIS_GLOBAL_LBN);
 	else
 		ctrl1 &= ~(1 << MDIO_MMDREG_TXDIS_GLOBAL_LBN);
 	if (ctrl1 != ctrl2)
 		mdio_clause45_write(efx, phy_id, MDIO_MMD_PMAPMD,
 				    MDIO_MMDREG_TXDIS, ctrl2);
 }

 void mdio_clause45_phy_reconfigure(struct efx_nic *efx)
 {
 	int phy_id = efx->mii.phy_id;
 	int ctrl1, ctrl2;

 	/* Handle (with debouncing) PMA/PMD loopback */
 	ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PMAPMD,
 					   MDIO_MMDREG_CTRL1);

 	if (efx->loopback_mode == LOOPBACK_PMAPMD)
 		ctrl2 |= (1 << MDIO_PMAPMD_CTRL1_LBACK_LBN);
 	else
 		ctrl2 &= ~(1 << MDIO_PMAPMD_CTRL1_LBACK_LBN);

 	if (ctrl1 != ctrl2)
 		mdio_clause45_write(efx, phy_id, MDIO_MMD_PMAPMD,
 				    MDIO_MMDREG_CTRL1, ctrl2);

 	/* Handle (with debouncing) PCS loopback */
 	ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PCS,
 					   MDIO_MMDREG_CTRL1);
 	if (efx->loopback_mode == LOOPBACK_PCS)
 		ctrl2 |= (1 << MDIO_MMDREG_CTRL1_LBACK_LBN);
 	else
 		ctrl2 &= ~(1 << MDIO_MMDREG_CTRL1_LBACK_LBN);

 	if (ctrl1 != ctrl2)
 		mdio_clause45_write(efx, phy_id, MDIO_MMD_PCS,
 				    MDIO_MMDREG_CTRL1, ctrl2);

 	/* Handle (with debouncing) PHYXS network loopback */
 	ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PHYXS,
 					   MDIO_MMDREG_CTRL1);
 	if (efx->loopback_mode == LOOPBACK_NETWORK)
 		ctrl2 |= (1 << MDIO_MMDREG_CTRL1_LBACK_LBN);
 	else
 		ctrl2 &= ~(1 << MDIO_MMDREG_CTRL1_LBACK_LBN);

 	if (ctrl1 != ctrl2)
 		mdio_clause45_write(efx, phy_id, MDIO_MMD_PHYXS,
 				    MDIO_MMDREG_CTRL1, ctrl2);
 }

 /**
  * mdio_clause45_get_settings - Read (some of) the PHY settings over MDIO.
  * @efx:		Efx NIC
  * @ecmd: 		Buffer for settings
  *
  * On return the 'port', 'speed', 'supported' and 'advertising' fields of
  * ecmd have been filled out based on the PMA type.
  */
 void mdio_clause45_get_settings(struct efx_nic *efx,
 				struct ethtool_cmd *ecmd)
 {
 	int pma_type;

 	/* If no PMA is present we are presumably talking something XAUI-ish
 	 * like CX4. Which we report as FIBRE (see below) */
 	if ((efx->phy_op->mmds & DEV_PRESENT_BIT(MDIO_MMD_PMAPMD)) == 0) {
 		ecmd->speed = SPEED_10000;
 		ecmd->port = PORT_FIBRE;
 		ecmd->supported = SUPPORTED_FIBRE;
 		ecmd->advertising = ADVERTISED_FIBRE;
 		return;
 	}

 	pma_type = mdio_clause45_read(efx, efx->mii.phy_id,
 				      MDIO_MMD_PMAPMD, MDIO_MMDREG_CTRL2);
 	pma_type &= MDIO_PMAPMD_CTRL2_TYPE_MASK;

 	switch (pma_type) {
 		/* We represent CX4 as fibre in the absence of anything
 		   better. */
 	case MDIO_PMAPMD_CTRL2_10G_CX4:
 		ecmd->speed = SPEED_10000;
 		ecmd->port = PORT_FIBRE;
 		ecmd->supported = SUPPORTED_FIBRE;
 		ecmd->advertising = ADVERTISED_FIBRE;
 		break;
 		/* 10G Base-T */
 	case MDIO_PMAPMD_CTRL2_10G_BT:
 		ecmd->speed = SPEED_10000;
 		ecmd->port = PORT_TP;
 		ecmd->supported = SUPPORTED_TP | SUPPORTED_10000baseT_Full;
 		ecmd->advertising = (ADVERTISED_FIBRE
 				     | ADVERTISED_10000baseT_Full);
 		break;
 	case MDIO_PMAPMD_CTRL2_1G_BT:
 		ecmd->speed = SPEED_1000;
 		ecmd->port = PORT_TP;
 		ecmd->supported = SUPPORTED_TP | SUPPORTED_1000baseT_Full;
 		ecmd->advertising = (ADVERTISED_FIBRE
 				     | ADVERTISED_1000baseT_Full);
 		break;
 	case MDIO_PMAPMD_CTRL2_100_BT:
 		ecmd->speed = SPEED_100;
 		ecmd->port = PORT_TP;
 		ecmd->supported = SUPPORTED_TP | SUPPORTED_100baseT_Full;
 		ecmd->advertising = (ADVERTISED_FIBRE
 				     | ADVERTISED_100baseT_Full);
 		break;
 	case MDIO_PMAPMD_CTRL2_10_BT:
 		ecmd->speed = SPEED_10;
 		ecmd->port = PORT_TP;
 		ecmd->supported = SUPPORTED_TP | SUPPORTED_10baseT_Full;
 		ecmd->advertising = ADVERTISED_FIBRE | ADVERTISED_10baseT_Full;
 		break;
 	/* All the other defined modes are flavours of
 	 * 10G optical */
 	default:
 		ecmd->speed = SPEED_10000;
 		ecmd->port = PORT_FIBRE;
 		ecmd->supported = SUPPORTED_FIBRE;
 		ecmd->advertising = ADVERTISED_FIBRE;
 		break;
 	}
 }

 /**
  * mdio_clause45_set_settings - Set (some of) the PHY settings over MDIO.
  * @efx:		Efx NIC
  * @ecmd: 		New settings
  *
  * Currently this just enforces that we are _not_ changing the
  * 'port', 'speed', 'supported' or 'advertising' settings as these
  * cannot be changed on any currently supported PHY.
  */
 int mdio_clause45_set_settings(struct efx_nic *efx,
 			       struct ethtool_cmd *ecmd)
 {
 	struct ethtool_cmd tmpcmd;
 	mdio_clause45_get_settings(efx, &tmpcmd);
 	/* None of the current PHYs support more than one mode
 	 * of operation (and only 10GBT ever will), so keep things
 	 * simple for now */
 	if ((ecmd->speed == tmpcmd.speed) && (ecmd->port == tmpcmd.port) &&
 	    (ecmd->supported == tmpcmd.supported) &&
 	    (ecmd->advertising == tmpcmd.advertising))
 		return 0;
 	return -EOPNOTSUPP;
 }
	/****************************************************************************
	* Driver for Solarflare Solarstorm network controllers and boards
	* Copyright 2006-2008 Solarflare Communications Inc.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 as published
	* by the Free Software Foundation, incorporated herein by reference.
	*/
	/*
	* Useful functions for working with MDIO clause 45 PHYs
	*/
	#include <linux/types.h>
	#include <linux/ethtool.h>
	#include <linux/delay.h>
	#include "net_driver.h"
	#include "mdio_10g.h"
	#include "boards.h"

	int mdio_clause45_reset_mmd(struct efx_nic *port, int mmd,
	int spins, int spintime)
	{
	u32 ctrl;
	int phy_id = port->mii.phy_id;

	/* Catch callers passing values in the wrong units (or just silly) */
	EFX_BUG_ON_PARANOID(spins * spintime >= 5000);

	mdio_clause45_write(port, phy_id, mmd, MDIO_MMDREG_CTRL1,
	(1 << MDIO_MMDREG_CTRL1_RESET_LBN));
	/* Wait for the reset bit to clear. */
	do {
	msleep(spintime);
	ctrl = mdio_clause45_read(port, phy_id, mmd, MDIO_MMDREG_CTRL1);
	spins--;

	} while (spins && (ctrl & (1 << MDIO_MMDREG_CTRL1_RESET_LBN)));

	return spins ? spins : -ETIMEDOUT;
	}

	static int mdio_clause45_check_mmd(struct efx_nic *efx, int mmd,
	int fault_fatal)
	{
	int status;
	int phy_id = efx->mii.phy_id;

	if (LOOPBACK_INTERNAL(efx))
	return 0;

	/* Read MMD STATUS2 to check it is responding. */
	status = mdio_clause45_read(efx, phy_id, mmd, MDIO_MMDREG_STAT2);
	if (((status >> MDIO_MMDREG_STAT2_PRESENT_LBN) &
	((1 << MDIO_MMDREG_STAT2_PRESENT_WIDTH) - 1)) !=
	MDIO_MMDREG_STAT2_PRESENT_VAL) {
	EFX_ERR(efx, "PHY MMD %d not responding.\n", mmd);
	return -EIO;
	}

	/* Read MMD STATUS 1 to check for fault. */
	status = mdio_clause45_read(efx, phy_id, mmd, MDIO_MMDREG_STAT1);
	if ((status & (1 << MDIO_MMDREG_STAT1_FAULT_LBN)) != 0) {
	if (fault_fatal) {
	EFX_ERR(efx, "PHY MMD %d reporting fatal"
	" fault: status %x\n", mmd, status);
	return -EIO;
	} else {
	EFX_LOG(efx, "PHY MMD %d reporting status"
	" %x (expected)\n", mmd, status);
	}
	}
	return 0;
	}

	/* This ought to be ridiculous overkill. We expect it to fail rarely */
	#define MDIO45_RESET_TIME 1000 /* ms */
	#define MDIO45_RESET_ITERS 100

	int mdio_clause45_wait_reset_mmds(struct efx_nic *efx,
	unsigned int mmd_mask)
	{
	const int spintime = MDIO45_RESET_TIME / MDIO45_RESET_ITERS;
	int tries = MDIO45_RESET_ITERS;
	int rc = 0;
	int in_reset;

	while (tries) {
	int mask = mmd_mask;
	int mmd = 0;
	int stat;
	in_reset = 0;
	while (mask) {
	if (mask & 1) {
	stat = mdio_clause45_read(efx,
	efx->mii.phy_id,
	mmd,
	MDIO_MMDREG_CTRL1);
	if (stat < 0) {
	EFX_ERR(efx, "failed to read status of"
	" MMD %d\n", mmd);
	return -EIO;
	}
	if (stat & (1 << MDIO_MMDREG_CTRL1_RESET_LBN))
	in_reset \|= (1 << mmd);
	}
	mask = mask >> 1;
	mmd++;
	}
	if (!in_reset)
	break;
	tries--;
	msleep(spintime);
	}
	if (in_reset != 0) {
	EFX_ERR(efx, "not all MMDs came out of reset in time."
	" MMDs still in reset: %x\n", in_reset);
	rc = -ETIMEDOUT;
	}
	return rc;
	}

	int mdio_clause45_check_mmds(struct efx_nic *efx,
	unsigned int mmd_mask, unsigned int fatal_mask)
	{
	int devices, mmd = 0;
	int probe_mmd;

	/* Historically we have probed the PHYXS to find out what devices are
	* present,but that doesn't work so well if the PHYXS isn't expected
	* to exist, if so just find the first item in the list supplied. */
	probe_mmd = (mmd_mask & MDIO_MMDREG_DEVS0_PHYXS) ? MDIO_MMD_PHYXS :
	__ffs(mmd_mask);
	devices = mdio_clause45_read(efx, efx->mii.phy_id,
	probe_mmd, MDIO_MMDREG_DEVS0);

	/* Check all the expected MMDs are present */
	if (devices < 0) {
	EFX_ERR(efx, "failed to read devices present\n");
	return -EIO;
	}
	if ((devices & mmd_mask) != mmd_mask) {
	EFX_ERR(efx, "required MMDs not present: got %x, "
	"wanted %x\n", devices, mmd_mask);
	return -ENODEV;
	}
	EFX_TRACE(efx, "Devices present: %x\n", devices);

	/* Check all required MMDs are responding and happy. */
	while (mmd_mask) {
	if (mmd_mask & 1) {
	int fault_fatal = fatal_mask & 1;
	if (mdio_clause45_check_mmd(efx, mmd, fault_fatal))
	return -EIO;
	}
	mmd_mask = mmd_mask >> 1;
	fatal_mask = fatal_mask >> 1;
	mmd++;
	}

	return 0;
	}

	int mdio_clause45_links_ok(struct efx_nic *efx, unsigned int mmd_mask)
	{
	int phy_id = efx->mii.phy_id;
	int status;
	int ok = 1;
	int mmd = 0;
	int good;

	/* If the port is in loopback, then we should only consider a subset
	* of mmd's */
	if (LOOPBACK_INTERNAL(efx))
	return 1;
	else if (efx->loopback_mode == LOOPBACK_NETWORK)
	return 0;
	else if (efx->loopback_mode == LOOPBACK_PHYXS)
	mmd_mask &= ~(MDIO_MMDREG_DEVS0_PHYXS \|
	MDIO_MMDREG_DEVS0_PCS \|
	MDIO_MMDREG_DEVS0_PMAPMD);
	else if (efx->loopback_mode == LOOPBACK_PCS)
	mmd_mask &= ~(MDIO_MMDREG_DEVS0_PCS \|
	MDIO_MMDREG_DEVS0_PMAPMD);
	else if (efx->loopback_mode == LOOPBACK_PMAPMD)
	mmd_mask &= ~MDIO_MMDREG_DEVS0_PMAPMD;

	while (mmd_mask) {
	if (mmd_mask & 1) {
	/* Double reads because link state is latched, and a
	* read moves the current state into the register */
	status = mdio_clause45_read(efx, phy_id,
	mmd, MDIO_MMDREG_STAT1);
	status = mdio_clause45_read(efx, phy_id,
	mmd, MDIO_MMDREG_STAT1);

	good = status & (1 << MDIO_MMDREG_STAT1_LINK_LBN);
	ok = ok && good;
	}
	mmd_mask = (mmd_mask >> 1);
	mmd++;
	}
	return ok;
	}

	void mdio_clause45_transmit_disable(struct efx_nic *efx)
	{
	int phy_id = efx->mii.phy_id;
	int ctrl1, ctrl2;

	ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PMAPMD,
	MDIO_MMDREG_TXDIS);
	if (efx->tx_disabled)
	ctrl2 \|= (1 << MDIO_MMDREG_TXDIS_GLOBAL_LBN);
	else
	ctrl1 &= ~(1 << MDIO_MMDREG_TXDIS_GLOBAL_LBN);
	if (ctrl1 != ctrl2)
	mdio_clause45_write(efx, phy_id, MDIO_MMD_PMAPMD,
	MDIO_MMDREG_TXDIS, ctrl2);
	}

	void mdio_clause45_phy_reconfigure(struct efx_nic *efx)
	{
	int phy_id = efx->mii.phy_id;
	int ctrl1, ctrl2;

	/* Handle (with debouncing) PMA/PMD loopback */
	ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PMAPMD,
	MDIO_MMDREG_CTRL1);

	if (efx->loopback_mode == LOOPBACK_PMAPMD)
	ctrl2 \|= (1 << MDIO_PMAPMD_CTRL1_LBACK_LBN);
	else
	ctrl2 &= ~(1 << MDIO_PMAPMD_CTRL1_LBACK_LBN);

	if (ctrl1 != ctrl2)
	mdio_clause45_write(efx, phy_id, MDIO_MMD_PMAPMD,
	MDIO_MMDREG_CTRL1, ctrl2);

	/* Handle (with debouncing) PCS loopback */
	ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PCS,
	MDIO_MMDREG_CTRL1);
	if (efx->loopback_mode == LOOPBACK_PCS)
	ctrl2 \|= (1 << MDIO_MMDREG_CTRL1_LBACK_LBN);
	else
	ctrl2 &= ~(1 << MDIO_MMDREG_CTRL1_LBACK_LBN);

	if (ctrl1 != ctrl2)
	mdio_clause45_write(efx, phy_id, MDIO_MMD_PCS,
	MDIO_MMDREG_CTRL1, ctrl2);

	/* Handle (with debouncing) PHYXS network loopback */
	ctrl1 = ctrl2 = mdio_clause45_read(efx, phy_id, MDIO_MMD_PHYXS,
	MDIO_MMDREG_CTRL1);
	if (efx->loopback_mode == LOOPBACK_NETWORK)
	ctrl2 \|= (1 << MDIO_MMDREG_CTRL1_LBACK_LBN);
	else
	ctrl2 &= ~(1 << MDIO_MMDREG_CTRL1_LBACK_LBN);

	if (ctrl1 != ctrl2)
	mdio_clause45_write(efx, phy_id, MDIO_MMD_PHYXS,
	MDIO_MMDREG_CTRL1, ctrl2);
	}

	/**
	* mdio_clause45_get_settings - Read (some of) the PHY settings over MDIO.
	* @efx: Efx NIC
	* @ecmd: Buffer for settings
	*
	* On return the 'port', 'speed', 'supported' and 'advertising' fields of
	* ecmd have been filled out based on the PMA type.
	*/
	void mdio_clause45_get_settings(struct efx_nic *efx,
	struct ethtool_cmd *ecmd)
	{
	int pma_type;

	/* If no PMA is present we are presumably talking something XAUI-ish
	* like CX4. Which we report as FIBRE (see below) */
	if ((efx->phy_op->mmds & DEV_PRESENT_BIT(MDIO_MMD_PMAPMD)) == 0) {
	ecmd->speed = SPEED_10000;
	ecmd->port = PORT_FIBRE;
	ecmd->supported = SUPPORTED_FIBRE;
	ecmd->advertising = ADVERTISED_FIBRE;
	return;
	}

	pma_type = mdio_clause45_read(efx, efx->mii.phy_id,
	MDIO_MMD_PMAPMD, MDIO_MMDREG_CTRL2);
	pma_type &= MDIO_PMAPMD_CTRL2_TYPE_MASK;

	switch (pma_type) {
	/* We represent CX4 as fibre in the absence of anything
	better. */
	case MDIO_PMAPMD_CTRL2_10G_CX4:
	ecmd->speed = SPEED_10000;
	ecmd->port = PORT_FIBRE;
	ecmd->supported = SUPPORTED_FIBRE;
	ecmd->advertising = ADVERTISED_FIBRE;
	break;
	/* 10G Base-T */
	case MDIO_PMAPMD_CTRL2_10G_BT:
	ecmd->speed = SPEED_10000;
	ecmd->port = PORT_TP;
	ecmd->supported = SUPPORTED_TP \| SUPPORTED_10000baseT_Full;
	ecmd->advertising = (ADVERTISED_FIBRE
	\| ADVERTISED_10000baseT_Full);
	break;
	case MDIO_PMAPMD_CTRL2_1G_BT:
	ecmd->speed = SPEED_1000;
	ecmd->port = PORT_TP;
	ecmd->supported = SUPPORTED_TP \| SUPPORTED_1000baseT_Full;
	ecmd->advertising = (ADVERTISED_FIBRE
	\| ADVERTISED_1000baseT_Full);
	break;
	case MDIO_PMAPMD_CTRL2_100_BT:
	ecmd->speed = SPEED_100;
	ecmd->port = PORT_TP;
	ecmd->supported = SUPPORTED_TP \| SUPPORTED_100baseT_Full;
	ecmd->advertising = (ADVERTISED_FIBRE
	\| ADVERTISED_100baseT_Full);
	break;
	case MDIO_PMAPMD_CTRL2_10_BT:
	ecmd->speed = SPEED_10;
	ecmd->port = PORT_TP;
	ecmd->supported = SUPPORTED_TP \| SUPPORTED_10baseT_Full;
	ecmd->advertising = ADVERTISED_FIBRE \| ADVERTISED_10baseT_Full;
	break;
	/* All the other defined modes are flavours of
	* 10G optical */
	default:
	ecmd->speed = SPEED_10000;
	ecmd->port = PORT_FIBRE;
	ecmd->supported = SUPPORTED_FIBRE;
	ecmd->advertising = ADVERTISED_FIBRE;
	break;
	}
	}

	/**
	* mdio_clause45_set_settings - Set (some of) the PHY settings over MDIO.
	* @efx: Efx NIC
	* @ecmd: New settings
	*
	* Currently this just enforces that we are _not_ changing the
	* 'port', 'speed', 'supported' or 'advertising' settings as these
	* cannot be changed on any currently supported PHY.
	*/
	int mdio_clause45_set_settings(struct efx_nic *efx,
	struct ethtool_cmd *ecmd)
	{
	struct ethtool_cmd tmpcmd;
	mdio_clause45_get_settings(efx, &tmpcmd);
	/* None of the current PHYs support more than one mode
	* of operation (and only 10GBT ever will), so keep things
	* simple for now */
	if ((ecmd->speed == tmpcmd.speed) && (ecmd->port == tmpcmd.port) &&
	(ecmd->supported == tmpcmd.supported) &&
	(ecmd->advertising == tmpcmd.advertising))
	return 0;
	return -EOPNOTSUPP;
	}