drivers/net/mii.c



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/*

	mii.c: MII interface library

	Maintained by Jeff Garzik <jgarzik@pobox.com>
	Copyright 2001,2002 Jeff Garzik

	Various code came from myson803.c and other files by
	Donald Becker.  Copyright:

		Written 1998-2002 by Donald Becker.

		This software may be used and distributed according
		to the terms of the GNU General Public License (GPL),
		incorporated herein by reference.  Drivers based on
		or derived from this code fall under the GPL and must
		retain the authorship, copyright and license notice.
		This file is not a complete program and may only be
		used when the entire operating system is licensed
		under the GPL.

		The author may be reached as becker@scyld.com, or C/O
		Scyld Computing Corporation
		410 Severn Ave., Suite 210
		Annapolis MD 21403


 */

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

/**
 * mii_ethtool_gset - get settings that are specified in @ecmd
 * @mii: MII interface
 * @ecmd: requested ethtool_cmd
 *
 * Returns 0 for success, negative on error.
 */
int mii_ethtool_gset(struct mii_if_info *mii, struct ethtool_cmd *ecmd)
{
	struct net_device *dev = mii->dev;
	u32 advert, bmcr, lpa, nego;
	u32 advert2 = 0, bmcr2 = 0, lpa2 = 0;

	ecmd->supported =
	    (SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full |
	     SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full |
	     SUPPORTED_Autoneg | SUPPORTED_TP | SUPPORTED_MII);
	if (mii->supports_gmii)
		ecmd->supported |= SUPPORTED_1000baseT_Half |
			SUPPORTED_1000baseT_Full;

	/* only supports twisted-pair */
	ecmd->port = PORT_MII;

	/* only supports internal transceiver */
	ecmd->transceiver = XCVR_INTERNAL;

	/* this isn't fully supported at higher layers */
	ecmd->phy_address = mii->phy_id;

	ecmd->advertising = ADVERTISED_TP | ADVERTISED_MII;
	advert = mii->mdio_read(dev, mii->phy_id, MII_ADVERTISE);
	if (mii->supports_gmii)
		advert2 = mii->mdio_read(dev, mii->phy_id, MII_CTRL1000);

	if (advert & ADVERTISE_10HALF)
		ecmd->advertising |= ADVERTISED_10baseT_Half;
	if (advert & ADVERTISE_10FULL)
		ecmd->advertising |= ADVERTISED_10baseT_Full;
	if (advert & ADVERTISE_100HALF)
		ecmd->advertising |= ADVERTISED_100baseT_Half;
	if (advert & ADVERTISE_100FULL)
		ecmd->advertising |= ADVERTISED_100baseT_Full;
	if (advert2 & ADVERTISE_1000HALF)
		ecmd->advertising |= ADVERTISED_1000baseT_Half;
	if (advert2 & ADVERTISE_1000FULL)
		ecmd->advertising |= ADVERTISED_1000baseT_Full;

	bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR);
	lpa = mii->mdio_read(dev, mii->phy_id, MII_LPA);
	if (mii->supports_gmii) {
		bmcr2 = mii->mdio_read(dev, mii->phy_id, MII_CTRL1000);
		lpa2 = mii->mdio_read(dev, mii->phy_id, MII_STAT1000);
	}
	if (bmcr & BMCR_ANENABLE) {
		ecmd->advertising |= ADVERTISED_Autoneg;
		ecmd->autoneg = AUTONEG_ENABLE;

		nego = mii_nway_result(advert & lpa);
		if ((bmcr2 & (ADVERTISE_1000HALF | ADVERTISE_1000FULL)) &
		    (lpa2 >> 2))
			ecmd->speed = SPEED_1000;
		else if (nego == LPA_100FULL || nego == LPA_100HALF)
			ecmd->speed = SPEED_100;
		else
			ecmd->speed = SPEED_10;
		if ((lpa2 & LPA_1000FULL) || nego == LPA_100FULL ||
		    nego == LPA_10FULL) {
			ecmd->duplex = DUPLEX_FULL;
			mii->full_duplex = 1;
		} else {
			ecmd->duplex = DUPLEX_HALF;
			mii->full_duplex = 0;
		}
	} else {
		ecmd->autoneg = AUTONEG_DISABLE;

		ecmd->speed = ((bmcr & BMCR_SPEED1000 &&
				(bmcr & BMCR_SPEED100) == 0) ? SPEED_1000 :
			       (bmcr & BMCR_SPEED100) ? SPEED_100 : SPEED_10);
		ecmd->duplex = (bmcr & BMCR_FULLDPLX) ? DUPLEX_FULL : DUPLEX_HALF;
	}

	/* ignore maxtxpkt, maxrxpkt for now */

	return 0;
}

/**
 * mii_ethtool_sset - set settings that are specified in @ecmd
 * @mii: MII interface
 * @ecmd: requested ethtool_cmd
 *
 * Returns 0 for success, negative on error.
 */
int mii_ethtool_sset(struct mii_if_info *mii, struct ethtool_cmd *ecmd)
{
	struct net_device *dev = mii->dev;

	if (ecmd->speed != SPEED_10 &&
	    ecmd->speed != SPEED_100 &&
	    ecmd->speed != SPEED_1000)
		return -EINVAL;
	if (ecmd->duplex != DUPLEX_HALF && ecmd->duplex != DUPLEX_FULL)
		return -EINVAL;
	if (ecmd->port != PORT_MII)
		return -EINVAL;
	if (ecmd->transceiver != XCVR_INTERNAL)
		return -EINVAL;
	if (ecmd->phy_address != mii->phy_id)
		return -EINVAL;
	if (ecmd->autoneg != AUTONEG_DISABLE && ecmd->autoneg != AUTONEG_ENABLE)
		return -EINVAL;
	if ((ecmd->speed == SPEED_1000) && (!mii->supports_gmii))
		return -EINVAL;

	/* ignore supported, maxtxpkt, maxrxpkt */

	if (ecmd->autoneg == AUTONEG_ENABLE) {
		u32 bmcr, advert, tmp;
		u32 advert2 = 0, tmp2 = 0;

		if ((ecmd->advertising & (ADVERTISED_10baseT_Half |
					  ADVERTISED_10baseT_Full |
					  ADVERTISED_100baseT_Half |
					  ADVERTISED_100baseT_Full |
					  ADVERTISED_1000baseT_Half |
					  ADVERTISED_1000baseT_Full)) == 0)
			return -EINVAL;

		/* advertise only what has been requested */
		advert = mii->mdio_read(dev, mii->phy_id, MII_ADVERTISE);
		tmp = advert & ~(ADVERTISE_ALL | ADVERTISE_100BASE4);
		if (mii->supports_gmii) {
			advert2 = mii->mdio_read(dev, mii->phy_id, MII_CTRL1000);
			tmp2 = advert2 & ~(ADVERTISE_1000HALF | ADVERTISE_1000FULL);
		}
		if (ecmd->advertising & ADVERTISED_10baseT_Half)
			tmp |= ADVERTISE_10HALF;
		if (ecmd->advertising & ADVERTISED_10baseT_Full)
			tmp |= ADVERTISE_10FULL;
		if (ecmd->advertising & ADVERTISED_100baseT_Half)
			tmp |= ADVERTISE_100HALF;
		if (ecmd->advertising & ADVERTISED_100baseT_Full)
			tmp |= ADVERTISE_100FULL;
		if (mii->supports_gmii) {
			if (ecmd->advertising & ADVERTISED_1000baseT_Half)
				tmp2 |= ADVERTISE_1000HALF;
			if (ecmd->advertising & ADVERTISED_1000baseT_Full)
				tmp2 |= ADVERTISE_1000FULL;
		}
		if (advert != tmp) {
			mii->mdio_write(dev, mii->phy_id, MII_ADVERTISE, tmp);
			mii->advertising = tmp;
		}
		if ((mii->supports_gmii) && (advert2 != tmp2))
			mii->mdio_write(dev, mii->phy_id, MII_CTRL1000, tmp2);

		/* turn on autonegotiation, and force a renegotiate */
		bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR);
		bmcr |= (BMCR_ANENABLE | BMCR_ANRESTART);
		mii->mdio_write(dev, mii->phy_id, MII_BMCR, bmcr);

		mii->force_media = 0;
	} else {
		u32 bmcr, tmp;

		/* turn off auto negotiation, set speed and duplexity */
		bmcr = mii->mdio_read(dev, mii->phy_id, MII_BMCR);
		tmp = bmcr & ~(BMCR_ANENABLE | BMCR_SPEED100 |
			       BMCR_SPEED1000 | BMCR_FULLDPLX);
		if (ecmd->speed == SPEED_1000)
			tmp |= BMCR_SPEED1000;
		else if (ecmd->speed == SPEED_100)
			tmp |= BMCR_SPEED100;
		if (ecmd->duplex == DUPLEX_FULL) {
			tmp |= BMCR_FULLDPLX;
			mii->full_duplex = 1;
		} else
			mii->full_duplex = 0;
		if (bmcr != tmp)
			mii->mdio_write(dev, mii->phy_id, MII_BMCR, tmp);

		mii->force_media = 1;
	}
	return 0;
}

/**
 * mii_check_gmii_support - check if the MII supports Gb interfaces
 * @mii: the MII interface
 */
int mii_check_gmii_support(struct mii_if_info *mii)
{
	int reg;

	reg = mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR);
	if (reg & BMSR_ESTATEN) {
		reg = mii->mdio_read(mii->dev, mii->phy_id, MII_ESTATUS);
		if (reg & (ESTATUS_1000_TFULL | ESTATUS_1000_THALF))
			return 1;
	}

	return 0;
}

/**
 * mii_link_ok - is link status up/ok
 * @mii: the MII interface
 *
 * Returns 1 if the MII reports link status up/ok, 0 otherwise.
 */
int mii_link_ok (struct mii_if_info *mii)
{
	/* first, a dummy read, needed to latch some MII phys */
	mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR);
	if (mii->mdio_read(mii->dev, mii->phy_id, MII_BMSR) & BMSR_LSTATUS)
		return 1;
	return 0;
}

/**
 * mii_nway_restart - restart NWay (autonegotiation) for this interface
 * @mii: the MII interface
 *
 * Returns 0 on success, negative on error.
 */
int mii_nway_restart (struct mii_if_info *mii)
{
	int bmcr;
	int r = -EINVAL;

	/* if autoneg is off, it's an error */
	bmcr = mii->mdio_read(mii->dev, mii->phy_id, MII_BMCR);

	if (bmcr & BMCR_ANENABLE) {
		bmcr |= BMCR_ANRESTART;
		mii->mdio_write(mii->dev