/*      $NetBSD: mii_physubr.c,v 1.5 1999/08/03 19:41:49 drochner Exp $ */

/*-
 * Copyright (c) 1998, 1999, 2000, 2001 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
 * NASA Ames Research Center.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

/*
 * Subroutines common to all PHYs.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/errno.h>
#include <sys/module.h>
#include <sys/bus.h>

#include <net/if.h>
#include <net/if_media.h>

#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>

#include "miibus_if.h"

/*
 *
 * An array of structures to map MII media types to BMCR/ANAR settings.
 */
enum { 
        MII_MEDIA_NONE = 0,
        MII_MEDIA_10_T,
        MII_MEDIA_10_T_FDX,
        MII_MEDIA_100_T4,
        MII_MEDIA_100_TX,
        MII_MEDIA_100_TX_FDX,
        MII_MEDIA_1000_X,
        MII_MEDIA_1000_X_FDX,
        MII_MEDIA_1000_T,
        MII_MEDIA_1000_T_FDX,
        MII_NMEDIA,
};

static const struct mii_media {
        u_int   mm_bmcr;                /* BMCR settings for this media */
        u_int   mm_anar;                /* ANAR settings for this media */
        u_int   mm_gtcr;                /* 100base-T2 or 1000base-T CR */
} mii_media_table[MII_NMEDIA] = {
        /* None */
        { BMCR_ISO,             ANAR_CSMA,
          0, },

        /* 10baseT */
        { BMCR_S10,             ANAR_CSMA|ANAR_10,
          0, },

        /* 10baseT-FDX */
        { BMCR_S10|BMCR_FDX,    ANAR_CSMA|ANAR_10_FD,
          0, },

        /* 100baseT4 */
        { BMCR_S100,            ANAR_CSMA|ANAR_T4,
          0, },

        /* 100baseTX */
        { BMCR_S100,            ANAR_CSMA|ANAR_TX,
          0, },

        /* 100baseTX-FDX */
        { BMCR_S100|BMCR_FDX,   ANAR_CSMA|ANAR_TX_FD,
          0, },

        /* 1000baseX */
        { BMCR_S1000,           ANAR_CSMA,
          0, },

        /* 1000baseX-FDX */
        { BMCR_S1000|BMCR_FDX,  ANAR_CSMA,
          0, },

        /* 1000baseT */
        { BMCR_S1000,           ANAR_CSMA,
          GTCR_ADV_1000THDX },

        /* 1000baseT-FDX */
        { BMCR_S1000,           ANAR_CSMA,
          GTCR_ADV_1000TFDX },
};

void
mii_phy_setmedia(struct mii_softc *sc)
{
        struct mii_data *mii = sc->mii_pdata;
        struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
        int bmcr, anar, gtcr;
        int index = -1;

        switch (IFM_SUBTYPE(ife->ifm_media)) {
        case IFM_AUTO:
                /*
                 * Force renegotiation if MIIF_DOPAUSE or MIIF_FORCEANEG.
                 * The former is necessary as we might switch from flow-
                 * control advertisement being off to on or vice versa.
                 */
                if ((PHY_READ(sc, MII_BMCR) & BMCR_AUTOEN) == 0 ||
                    (sc->mii_flags & (MIIF_DOPAUSE | MIIF_FORCEANEG)) != 0)
                        (void)mii_phy_auto(sc);
                return;

        case IFM_NONE:
                index = MII_MEDIA_NONE;
                break;

        case IFM_HPNA_1:
                index = MII_MEDIA_10_T;
                break;

        case IFM_10_T:
                switch (IFM_OPTIONS(ife->ifm_media)) {
                case 0:
                        index = MII_MEDIA_10_T;
                        break;
                case IFM_FDX:
                case (IFM_FDX | IFM_FLOW):
                        index = MII_MEDIA_10_T_FDX;
                        break;
                }
                break;

        case IFM_100_TX:
        case IFM_100_FX:
                switch (IFM_OPTIONS(ife->ifm_media)) {
                case 0:
                        index = MII_MEDIA_100_TX;
                        break;
                case IFM_FDX:
                case (IFM_FDX | IFM_FLOW):
                        index = MII_MEDIA_100_TX_FDX;
                        break;
                }
                break;

        case IFM_100_T4:
                index = MII_MEDIA_100_T4;
                break;

        case IFM_1000_SX:
                switch (IFM_OPTIONS(ife->ifm_media)) {
                case 0:
                        index = MII_MEDIA_1000_X;
                        break;
                case IFM_FDX:
                case (IFM_FDX | IFM_FLOW):
                        index = MII_MEDIA_1000_X_FDX;
                        break;
                }
                break;

        case IFM_1000_T:
                switch (IFM_OPTIONS(ife->ifm_media)) {
                case 0:
                case IFM_ETH_MASTER:
                        index = MII_MEDIA_1000_T;
                        break;
                case IFM_FDX:
                case (IFM_FDX | IFM_ETH_MASTER):
                case (IFM_FDX | IFM_FLOW):
                case (IFM_FDX | IFM_FLOW | IFM_ETH_MASTER):
                        index = MII_MEDIA_1000_T_FDX;
                        break;
                }
                break;
        }

        KASSERT(index != -1, ("%s: failed to map media word %d",
            __func__, ife->ifm_media));

        anar = mii_media_table[index].mm_anar;
        bmcr = mii_media_table[index].mm_bmcr;
        gtcr = mii_media_table[index].mm_gtcr;

        if (IFM_SUBTYPE(ife->ifm_media) == IFM_1000_T) {
                gtcr |= GTCR_MAN_MS;
                if ((ife->ifm_media & IFM_ETH_MASTER) != 0)
                        gtcr |= GTCR_ADV_MS;
        }

        if ((ife->ifm_media & IFM_FDX) != 0 &&
            ((ife->ifm_media & IFM_FLOW) != 0 ||
            (sc->mii_flags & MIIF_FORCEPAUSE) != 0)) {
                if ((sc->mii_flags & MIIF_IS_1000X) != 0)
                        anar |= ANAR_X_PAUSE_TOWARDS;
                else {
                        anar |= ANAR_FC;
                        /* XXX Only 1000BASE-T has PAUSE_ASYM? */
                        if ((sc->mii_flags & MIIF_HAVE_GTCR) != 0 &&
                            (sc->mii_extcapabilities &
                            (EXTSR_1000THDX | EXTSR_1000TFDX)) != 0)
                                anar |= ANAR_X_PAUSE_ASYM;
                }
        }

        PHY_WRITE(sc, MII_ANAR, anar);
        PHY_WRITE(sc, MII_BMCR, bmcr);
        if ((sc->mii_flags & MIIF_HAVE_GTCR) != 0)
                PHY_WRITE(sc, MII_100T2CR, gtcr);
}

int
mii_phy_auto(struct mii_softc *sc)
{
        struct ifmedia_entry *ife = sc->mii_pdata->mii_media.ifm_cur;
        int anar, gtcr;

        /*
         * Check for 1000BASE-X.  Autonegotiation is a bit
         * different on such devices.
         */
        if ((sc->mii_flags & MIIF_IS_1000X) != 0) {
                anar = 0;
                if ((sc->mii_extcapabilities & EXTSR_1000XFDX) != 0)
                        anar |= ANAR_X_FD;
                if ((sc->mii_extcapabilities & EXTSR_1000XHDX) != 0)
                        anar |= ANAR_X_HD;

                if ((ife->ifm_media & IFM_FLOW) != 0 ||
                    (sc->mii_flags & MIIF_FORCEPAUSE) != 0)
                        anar |= ANAR_X_PAUSE_TOWARDS;
                PHY_WRITE(sc, MII_ANAR, anar);
        } else {
                anar = BMSR_MEDIA_TO_ANAR(sc->mii_capabilities) |
                    ANAR_CSMA;
                if ((ife->ifm_media & IFM_FLOW) != 0 ||
                    (sc->mii_flags & MIIF_FORCEPAUSE) != 0) {
                        if ((sc->mii_capabilities &
                            (BMSR_10TFDX | BMSR_100TXFDX)) != 0)
                                anar |= ANAR_FC;
                        /* XXX Only 1000BASE-T has PAUSE_ASYM? */
                        if (((sc->mii_flags & MIIF_HAVE_GTCR) != 0) &&
                            (sc->mii_extcapabilities &
                            (EXTSR_1000THDX | EXTSR_1000TFDX)) != 0)
                                anar |= ANAR_X_PAUSE_ASYM;
                }
                PHY_WRITE(sc, MII_ANAR, anar);
                if ((sc->mii_flags & MIIF_HAVE_GTCR) != 0) {
                        gtcr = 0;
                        if ((sc->mii_extcapabilities & EXTSR_1000TFDX) != 0)
                                gtcr |= GTCR_ADV_1000TFDX;
                        if ((sc->mii_extcapabilities & EXTSR_1000THDX) != 0)
                                gtcr |= GTCR_ADV_1000THDX;
                        PHY_WRITE(sc, MII_100T2CR, gtcr);
                }
        }
        PHY_WRITE(sc, MII_BMCR, BMCR_AUTOEN | BMCR_STARTNEG);
        return (EJUSTRETURN);
}

int
mii_phy_tick(struct mii_softc *sc)
{
        struct ifmedia_entry *ife = sc->mii_pdata->mii_media.ifm_cur;
        int reg;

        /*
         * If we're not doing autonegotiation, we don't need to do
         * any extra work here.  However, we need to check the link
         * status so we can generate an announcement if the status
         * changes.
         */
        if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO) {
                sc->mii_ticks = 0;      /* reset autonegotiation timer. */
                return (0);
        }

        /* Read the status register twice; BMSR_LINK is latch-low. */
        reg = PHY_READ(sc, MII_BMSR) | PHY_READ(sc, MII_BMSR);
        if ((reg & BMSR_LINK) != 0) {
                sc->mii_ticks = 0;      /* reset autonegotiation timer. */
                /* See above. */
                return (0);
        }

        /* Announce link loss right after it happens */
        if (sc->mii_ticks++ == 0)
                return (0);

        /* XXX: use default value if phy driver did not set mii_anegticks */
        if (sc->mii_anegticks == 0)
                sc->mii_anegticks = MII_ANEGTICKS_GIGE;

        /* Only retry autonegotiation every mii_anegticks ticks. */
        if (sc->mii_ticks <= sc->mii_anegticks)
                return (EJUSTRETURN);

        sc->mii_ticks = 0;
        PHY_RESET(sc);
        mii_phy_auto(sc);
        return (0);
}

void
mii_phy_reset(struct mii_softc *sc)
{
        struct ifmedia_entry *ife = sc->mii_pdata->mii_media.ifm_cur;
        int i, reg;

        if ((sc->mii_flags & MIIF_NOISOLATE) != 0)
                reg = BMCR_RESET;
        else
                reg = BMCR_RESET | BMCR_ISO;
        PHY_WRITE(sc, MII_BMCR, reg);

        /* Wait 100ms for it to complete. */
        for (i = 0; i < 100; i++) {
                reg = PHY_READ(sc, MII_BMCR);
                if ((reg & BMCR_RESET) == 0)
                        break;
                DELAY(1000);
        }

        /* NB: a PHY may default to being powered down and/or isolated. */
        reg &= ~(BMCR_PDOWN | BMCR_ISO);
        if ((sc->mii_flags & MIIF_NOISOLATE) == 0 &&
            ((ife == NULL && sc->mii_inst != 0) ||
            (ife != NULL && IFM_INST(ife->ifm_media) != sc->mii_inst)))
                reg |= BMCR_ISO;
        if (PHY_READ(sc, MII_BMCR) != reg)
                PHY_WRITE(sc, MII_BMCR, reg);
}

void
mii_phy_update(struct mii_softc *sc, int cmd)
{
        struct mii_data *mii = sc->mii_pdata;

        if (sc->mii_media_active != mii->mii_media_active ||
            cmd == MII_MEDIACHG) {
                MIIBUS_STATCHG(sc->mii_dev);
                sc->mii_media_active = mii->mii_media_active;
        }
        if (sc->mii_media_status != mii->mii_media_status) {
                MIIBUS_LINKCHG(sc->mii_dev);
                sc->mii_media_status = mii->mii_media_status;
        }
}

/*
 * Initialize generic PHY media based on BMSR, called when a PHY is
 * attached.  We expect to be set up to print a comma-separated list
 * of media names.  Does not print a newline.
 */
void
mii_phy_add_media(struct mii_softc *sc)
{
        struct mii_data *mii = sc->mii_pdata;
        const char *sep = "";
        int fdx = 0;

        if ((sc->mii_capabilities & BMSR_MEDIAMASK) == 0 &&
            (sc->mii_extcapabilities & EXTSR_MEDIAMASK) == 0) {
                printf("no media present");
                return;
        }

        /*
         * Set the autonegotiation timer for 10/100 media.  Gigabit media is
         * handled below.
         */
        sc->mii_anegticks = MII_ANEGTICKS;

#define ADD(m)          ifmedia_add(&mii->mii_media, (m), 0, NULL)
#define PRINT(s)        printf("%s%s", sep, s); sep = ", "

        if ((sc->mii_flags & MIIF_NOISOLATE) == 0) {
                ADD(IFM_MAKEWORD(IFM_ETHER, IFM_NONE, 0, sc->mii_inst));
                PRINT("none");
        }

        /*
         * There are different interpretations for the bits in
         * HomePNA PHYs.  And there is really only one media type
         * that is supported.
         */
        if ((sc->mii_flags & MIIF_IS_HPNA) != 0) {
                if ((sc->mii_capabilities & BMSR_10THDX) != 0) {
                        ADD(IFM_MAKEWORD(IFM_ETHER, IFM_HPNA_1, 0,
                            sc->mii_inst));
                        PRINT("HomePNA1");
                }
                return;
        }

        if ((sc->mii_capabilities & BMSR_10THDX) != 0) {
                ADD(IFM_MAKEWORD(IFM_ETHER, IFM_10_T, 0, sc->mii_inst));
                PRINT("10baseT");
        }
        if ((sc->mii_capabilities & BMSR_10TFDX) != 0) {
                ADD(IFM_MAKEWORD(IFM_ETHER, IFM_10_T, IFM_FDX, sc->mii_inst));
                PRINT("10baseT-FDX");
                if ((sc->mii_flags & MIIF_DOPAUSE) != 0 &&
                    (sc->mii_flags & MIIF_NOMANPAUSE) == 0) {
                        ADD(IFM_MAKEWORD(IFM_ETHER, IFM_10_T,
                            IFM_FDX | IFM_FLOW, sc->mii_inst));
                        PRINT("10baseT-FDX-flow");
                }
                fdx = 1;
        }
        if ((sc->mii_capabilities & BMSR_100TXHDX) != 0) {
                ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, 0, sc->mii_inst));
                PRINT("100baseTX");
        }
        if ((sc->mii_capabilities & BMSR_100TXFDX) != 0) {
                ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX, IFM_FDX, sc->mii_inst));
                PRINT("100baseTX-FDX");
                if ((sc->mii_flags & MIIF_DOPAUSE) != 0 &&
                    (sc->mii_flags & MIIF_NOMANPAUSE) == 0) {
                        ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_TX,
                            IFM_FDX | IFM_FLOW, sc->mii_inst));
                        PRINT("100baseTX-FDX-flow");
                }
                fdx = 1;
        }
        if ((sc->mii_capabilities & BMSR_100T4) != 0) {
                ADD(IFM_MAKEWORD(IFM_ETHER, IFM_100_T4, 0, sc->mii_inst));
                PRINT("100baseT4");
        }

        if ((sc->mii_extcapabilities & EXTSR_MEDIAMASK) != 0) {
                /*
                 * XXX Right now only handle 1000SX and 1000TX.  Need
                 * XXX to handle 1000LX and 1000CX somehow.
                 */
                if ((sc->mii_extcapabilities & EXTSR_1000XHDX) != 0) {
                        sc->mii_anegticks = MII_ANEGTICKS_GIGE;
                        sc->mii_flags |= MIIF_IS_1000X;
                        ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_SX, 0,
                            sc->mii_inst));
                        PRINT("1000baseSX");
                }
                if ((sc->mii_extcapabilities & EXTSR_1000XFDX) != 0) {
                        sc->mii_anegticks = MII_ANEGTICKS_GIGE;
                        sc->mii_flags |= MIIF_IS_1000X;
                        ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_SX, IFM_FDX,
                            sc->mii_inst));
                        PRINT("1000baseSX-FDX");
                        if ((sc->mii_flags & MIIF_DOPAUSE) != 0 &&
                            (sc->mii_flags & MIIF_NOMANPAUSE) == 0) {
                                ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_SX,
                                    IFM_FDX | IFM_FLOW, sc->mii_inst));
                                PRINT("1000baseSX-FDX-flow");
                        }
                        fdx = 1;
                }

                /*
                 * 1000baseT media needs to be able to manipulate
                 * master/slave mode.
                 *
                 * All 1000baseT PHYs have a 1000baseT control register.
                 */
                if ((sc->mii_extcapabilities & EXTSR_1000THDX) != 0) {
                        sc->mii_anegticks = MII_ANEGTICKS_GIGE;
                        sc->mii_flags |= MIIF_HAVE_GTCR;
                        ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_T, 0,
                            sc->mii_inst));
                        PRINT("1000baseT");
                        ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_T,
                            IFM_ETH_MASTER, sc->mii_inst));
                        PRINT("1000baseT-master");
                }
                if ((sc->mii_extcapabilities & EXTSR_1000TFDX) != 0) {
                        sc->mii_anegticks = MII_ANEGTICKS_GIGE;
                        sc->mii_flags |= MIIF_HAVE_GTCR;
                        ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_T, IFM_FDX,
                            sc->mii_inst));
                        PRINT("1000baseT-FDX");
                        ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_T,
                            IFM_FDX | IFM_ETH_MASTER, sc->mii_inst));
                        PRINT("1000baseT-FDX-master");
                        if ((sc->mii_flags & MIIF_DOPAUSE) != 0 &&
                            (sc->mii_flags & MIIF_NOMANPAUSE) == 0) {
                                ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_T,
                                    IFM_FDX | IFM_FLOW, sc->mii_inst));
                                PRINT("1000baseT-FDX-flow");
                                ADD(IFM_MAKEWORD(IFM_ETHER, IFM_1000_T,
                                    IFM_FDX | IFM_FLOW | IFM_ETH_MASTER,
                                    sc->mii_inst));
                                PRINT("1000baseT-FDX-flow-master");
                        }
                        fdx = 1;
                }
        }

        if ((sc->mii_capabilities & BMSR_ANEG) != 0) {
                /* intentionally invalid index */
                ADD(IFM_MAKEWORD(IFM_ETHER, IFM_AUTO, 0, sc->mii_inst));
                PRINT("auto");
                if (fdx != 0 && (sc->mii_flags & MIIF_DOPAUSE) != 0) {
                        ADD(IFM_MAKEWORD(IFM_ETHER, IFM_AUTO, IFM_FLOW,
                            sc->mii_inst));
                        PRINT("auto-flow");
                }
        }
#undef ADD
#undef PRINT
}

int
mii_phy_detach(device_t dev)
{
        struct mii_softc *sc;

        sc = device_get_softc(dev);
        sc->mii_dev = NULL;
        LIST_REMOVE(sc, mii_list);
        return (0);
}

const struct mii_phydesc *
mii_phy_match_gen(const struct mii_attach_args *ma,
  const struct mii_phydesc *mpd, size_t len)
{

        for (; mpd->mpd_name != NULL;
            mpd = (const struct mii_phydesc *)((const char *)mpd + len)) {
                if (MII_OUI(ma->mii_id1, ma->mii_id2) == mpd->mpd_oui &&
                    MII_MODEL(ma->mii_id2) == mpd->mpd_model)
                        return (mpd);
        }
        return (NULL);
}

const struct mii_phydesc *
mii_phy_match(const struct mii_attach_args *ma, const struct mii_phydesc *mpd)
{

        return (mii_phy_match_gen(ma, mpd, sizeof(struct mii_phydesc)));
}

int
mii_phy_dev_probe(device_t dev, const struct mii_phydesc *mpd, int mrv)
{

        mpd = mii_phy_match(device_get_ivars(dev), mpd);
        if (mpd != NULL) {
                device_set_desc(dev, mpd->mpd_name);
                return (mrv);
        }
        return (ENXIO);
}

void
mii_phy_dev_attach(device_t dev, u_int flags, const struct mii_phy_funcs *mpf,
    int add_media)
{
        struct mii_softc *sc;
        struct mii_attach_args *ma;
        struct mii_data *mii;

        sc = device_get_softc(dev);
        ma = device_get_ivars(dev);
        sc->mii_dev = device_get_parent(dev);
        mii = ma->mii_data;
        LIST_INSERT_HEAD(&mii->mii_phys, sc, mii_list);

        sc->mii_flags = flags | miibus_get_flags(dev);
        sc->mii_mpd_oui = MII_OUI(ma->mii_id1, ma->mii_id2);
        sc->mii_mpd_model = MII_MODEL(ma->mii_id2);
        sc->mii_mpd_rev = MII_REV(ma->mii_id2);
        sc->mii_capmask = ma->mii_capmask;
        sc->mii_inst = mii->mii_instance++;
        sc->mii_phy = ma->mii_phyno;
        sc->mii_offset = ma->mii_offset;
        sc->mii_funcs = mpf;
        sc->mii_pdata = mii;

        if (bootverbose)
                device_printf(dev, "OUI 0x%06x, model 0x%04x, rev. %d\n",
                    sc->mii_mpd_oui, sc->mii_mpd_model, sc->mii_mpd_rev);

        if (add_media == 0)
                return;

        PHY_RESET(sc);

        sc->mii_capabilities = PHY_READ(sc, MII_BMSR) & sc->mii_capmask;
        if (sc->mii_capabilities & BMSR_EXTSTAT)
                sc->mii_extcapabilities = PHY_READ(sc, MII_EXTSR);
        device_printf(dev, " ");
        mii_phy_add_media(sc);
        printf("\n");

        MIIBUS_MEDIAINIT(sc->mii_dev);
}

/*
 * Return the flow control status flag from MII_ANAR & MII_ANLPAR.
 */
u_int
mii_phy_flowstatus(struct mii_softc *sc)
{
        int anar, anlpar;

        if ((sc->mii_flags & MIIF_DOPAUSE) == 0)
                return (0);

        anar = PHY_READ(sc, MII_ANAR);
        anlpar = PHY_READ(sc, MII_ANLPAR);

        /*
         * Check for 1000BASE-X.  Autonegotiation is a bit
         * different on such devices.
         */
        if ((sc->mii_flags & MIIF_IS_1000X) != 0) {
                anar <<= 3;
                anlpar <<= 3;
        }

        if ((anar & ANAR_PAUSE_SYM) != 0 && (anlpar & ANLPAR_PAUSE_SYM) != 0)
                return (IFM_FLOW | IFM_ETH_TXPAUSE | IFM_ETH_RXPAUSE);

        if ((anar & ANAR_PAUSE_SYM) == 0) {
                if ((anar & ANAR_PAUSE_ASYM) != 0 &&
                    (anlpar & ANLPAR_PAUSE_TOWARDS) != 0)
                        return (IFM_FLOW | IFM_ETH_TXPAUSE);
                else
                        return (0);
        }

        if ((anar & ANAR_PAUSE_ASYM) == 0) {
                if ((anlpar & ANLPAR_PAUSE_SYM) != 0)
                        return (IFM_FLOW | IFM_ETH_TXPAUSE | IFM_ETH_RXPAUSE);
                else
                        return (0);
        }

        switch ((anlpar & ANLPAR_PAUSE_TOWARDS)) {
        case ANLPAR_PAUSE_NONE:
                return (0);
        case ANLPAR_PAUSE_ASYM:
                return (IFM_FLOW | IFM_ETH_RXPAUSE);
        default:
                return (IFM_FLOW | IFM_ETH_RXPAUSE | IFM_ETH_TXPAUSE);
        }
        /* NOTREACHED */
}