/*      $OpenBSD: be.c,v 1.45 2024/05/13 01:15:53 jsg Exp $     */
/*      $NetBSD: be.c,v 1.26 2001/03/20 15:39:20 pk Exp $       */

/*-
 * Copyright (c) 1999 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Paul Kranenburg.
 *
 * 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.
 */

/*
 * Copyright (c) 1998 Theo de Raadt and Jason L. Wright.
 * All rights reserved.
 *
 * 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 AUTHORS ``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 AUTHORS 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 "bpfilter.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/timeout.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/device.h>
#include <sys/malloc.h>

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

#include <netinet/in.h>
#include <netinet/if_ether.h>

#if NBPFILTER > 0
#include <net/bpf.h>
#endif

#include <machine/bus.h>
#include <machine/intr.h>
#include <machine/autoconf.h>

#include <dev/sbus/sbusvar.h>

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

#include <dev/sbus/qecreg.h>
#include <dev/sbus/qecvar.h>
#include <dev/sbus/bereg.h>

struct be_softc {
        struct  device  sc_dev;
        bus_space_tag_t sc_bustag;      /* bus & dma tags */
        bus_dma_tag_t   sc_dmatag;
        bus_dmamap_t    sc_dmamap;
        struct  arpcom sc_arpcom;
        /*struct        ifmedia sc_ifmedia;     -* interface media */
        struct mii_data sc_mii;         /* MII media control */
#define sc_media        sc_mii.mii_media/* shorthand */
        int             sc_phys[2];     /* MII instance -> phy */

        struct timeout sc_tick_ch;

        /*
         * Some `mii_softc' items we need to emulate MII operation
         * for our internal transceiver.
         */
        int             sc_mii_inst;    /* instance of internal phy */
        uint64_t        sc_mii_active;  /* currently active medium */
        int             sc_mii_ticks;   /* tick counter */
        int             sc_mii_flags;   /* phy status flags */
#define MIIF_HAVELINK   0x04000000
        int             sc_intphy_curspeed;     /* Established link speed */

        struct  qec_softc *sc_qec;      /* QEC parent */

        bus_space_handle_t      sc_qr;  /* QEC registers */
        bus_space_handle_t      sc_br;  /* BE registers */
        bus_space_handle_t      sc_cr;  /* channel registers */
        bus_space_handle_t      sc_tr;  /* transceiver registers */

        u_int   sc_rev;

        int     sc_channel;             /* channel number */
        int     sc_burst;

        struct  qec_ring        sc_rb;  /* Packet Ring Buffer */
};

int     bematch(struct device *, void *, void *);
void    beattach(struct device *, struct device *, void *);

void    beinit(struct be_softc *);
void    bestart(struct ifnet *);
void    bestop(struct be_softc *);
void    bewatchdog(struct ifnet *);
int     beioctl(struct ifnet *, u_long, caddr_t);
void    bereset(struct be_softc *);

int     beintr(void *);
int     berint(struct be_softc *);
int     betint(struct be_softc *);
int     beqint(struct be_softc *, u_int32_t);
int     beeint(struct be_softc *, u_int32_t);

static void     be_read(struct be_softc *, int, int);
static int      be_put(struct be_softc *, int, struct mbuf *);
static struct mbuf *be_get(struct be_softc *, int, int);

void    be_pal_gate(struct be_softc *, int);

/* ifmedia callbacks */
void    be_ifmedia_sts(struct ifnet *, struct ifmediareq *);
int     be_ifmedia_upd(struct ifnet *);

void    be_mcreset(struct be_softc *);

/* MII methods & callbacks */
static int      be_mii_readreg(struct device *, int, int);
static void     be_mii_writereg(struct device *, int, int, int);
static void     be_mii_statchg(struct device *);

/* MII helpers */
static void     be_mii_sync(struct be_softc *);
static void     be_mii_sendbits(struct be_softc *, int, u_int32_t, int);
static int      be_mii_reset(struct be_softc *, int);
static int      be_tcvr_read_bit(struct be_softc *, int);
static void     be_tcvr_write_bit(struct be_softc *, int, int);

void    be_tick(void *);
void    be_intphy_status(struct be_softc *);
int     be_intphy_service(struct be_softc *, struct mii_data *, int);


const struct cfattach be_ca = {
        sizeof(struct be_softc), bematch, beattach
};

struct cfdriver be_cd = {
        NULL, "be", DV_IFNET
};

int
bematch(struct device *parent, void *vcf, void *aux)
{
        struct cfdata *cf = vcf;
        struct sbus_attach_args *sa = aux;

        return (strcmp(cf->cf_driver->cd_name, sa->sa_name) == 0);
}

void
beattach(struct device *parent, struct device *self, void *aux)
{
        struct sbus_attach_args *sa = aux;
        struct qec_softc *qec = (struct qec_softc *)parent;
        struct be_softc *sc = (struct be_softc *)self;
        struct ifnet *ifp = &sc->sc_arpcom.ac_if;
        struct mii_data *mii = &sc->sc_mii;
        struct mii_softc *child;
        int node = sa->sa_node;
        bus_dma_tag_t dmatag = sa->sa_dmatag;
        bus_dma_segment_t seg;
        bus_size_t size;
        uint64_t instance;
        int rseg, error;
        u_int32_t v;
        extern void myetheraddr(u_char *);

        /* Pass on the bus tags */
        sc->sc_bustag = sa->sa_bustag;
        sc->sc_dmatag = sa->sa_dmatag;

        if (sa->sa_nreg < 3) {
                printf("%s: only %d register sets\n",
                    self->dv_xname, sa->sa_nreg);
                return;
        }

        if (sbus_bus_map(sa->sa_bustag, sa->sa_reg[0].sbr_slot,
            (bus_addr_t)sa->sa_reg[0].sbr_offset,
            (bus_size_t)sa->sa_reg[0].sbr_size, 0, 0, &sc->sc_cr) != 0) {
                printf("beattach: cannot map registers\n");
                return;
        }

        if (sbus_bus_map(sa->sa_bustag, sa->sa_reg[1].sbr_slot,
            (bus_addr_t)sa->sa_reg[1].sbr_offset,
            (bus_size_t)sa->sa_reg[1].sbr_size, 0, 0, &sc->sc_br) != 0) {
                printf("beattach: cannot map registers\n");
                return;
        }

        if (sbus_bus_map(sa->sa_bustag, sa->sa_reg[2].sbr_slot,
            (bus_addr_t)sa->sa_reg[2].sbr_offset,
            (bus_size_t)sa->sa_reg[2].sbr_size, 0, 0, &sc->sc_tr) != 0) {
                printf("beattach: cannot map registers\n");
                return;
        }

        sc->sc_qec = qec;
        sc->sc_qr = qec->sc_regs;

        sc->sc_rev = getpropint(node, "board-version", -1);
        printf(" rev %x", sc->sc_rev);

        bestop(sc);

        sc->sc_channel = getpropint(node, "channel#", -1);
        if (sc->sc_channel == -1)
                sc->sc_channel = 0;

        sc->sc_burst = getpropint(node, "burst-sizes", -1);
        if (sc->sc_burst == -1)
                sc->sc_burst = qec->sc_burst;

        /* Clamp at parent's burst sizes */
        sc->sc_burst &= qec->sc_burst;

        /* Establish interrupt handler */
        if (sa->sa_nintr == 0 || bus_intr_establish(sa->sa_bustag, sa->sa_pri,
            IPL_NET, 0, beintr, sc, self->dv_xname) == NULL) {
                printf(": no interrupt established\n");
                return;
        }

        myetheraddr(sc->sc_arpcom.ac_enaddr);
        printf(" address %s\n", ether_sprintf(sc->sc_arpcom.ac_enaddr));

        /*
         * Allocate descriptor ring and buffers.
         */

        /* for now, allocate as many bufs as there are ring descriptors */
        sc->sc_rb.rb_ntbuf = QEC_XD_RING_MAXSIZE;
        sc->sc_rb.rb_nrbuf = QEC_XD_RING_MAXSIZE;

        size =  QEC_XD_RING_MAXSIZE * sizeof(struct qec_xd) +
                QEC_XD_RING_MAXSIZE * sizeof(struct qec_xd) +
                sc->sc_rb.rb_ntbuf * BE_PKT_BUF_SZ +
                sc->sc_rb.rb_nrbuf * BE_PKT_BUF_SZ;

        /* Get a DMA handle */
        if ((error = bus_dmamap_create(dmatag, size, 1, size, 0,
            BUS_DMA_NOWAIT, &sc->sc_dmamap)) != 0) {
                printf("%s: DMA map create error %d\n", self->dv_xname, error);
                return;
        }

        /* Allocate DMA buffer */
        if ((error = bus_dmamem_alloc(sa->sa_dmatag, size, 0, 0,
            &seg, 1, &rseg, BUS_DMA_NOWAIT)) != 0) {
                printf("%s: DMA buffer alloc error %d\n",
                        self->dv_xname, error);
                return;
        }

        /* Map DMA memory in CPU addressable space */
        if ((error = bus_dmamem_map(sa->sa_dmatag, &seg, rseg, size,
            &sc->sc_rb.rb_membase, BUS_DMA_NOWAIT|BUS_DMA_COHERENT)) != 0) {
                printf("%s: DMA buffer map error %d\n",
                        self->dv_xname, error);
                bus_dmamem_free(sa->sa_dmatag, &seg, rseg);
                return;
        }

        /* Load the buffer */
        if ((error = bus_dmamap_load(dmatag, sc->sc_dmamap,
            sc->sc_rb.rb_membase, size, NULL, BUS_DMA_NOWAIT)) != 0) {
                printf("%s: DMA buffer map load error %d\n",
                    self->dv_xname, error);
                bus_dmamem_unmap(dmatag, sc->sc_rb.rb_membase, size);
                bus_dmamem_free(dmatag, &seg, rseg);
                return;
        }
        sc->sc_rb.rb_dmabase = sc->sc_dmamap->dm_segs[0].ds_addr;

        /*
         * Initialize our media structures and MII info.
         */
        mii->mii_ifp = ifp;
        mii->mii_readreg = be_mii_readreg;
        mii->mii_writereg = be_mii_writereg;
        mii->mii_statchg = be_mii_statchg;

        ifmedia_init(&mii->mii_media, 0, be_ifmedia_upd, be_ifmedia_sts);

        timeout_set(&sc->sc_tick_ch, be_tick, sc);

        /*
         * Initialize transceiver and determine which PHY connection to use.
         */
        be_mii_sync(sc);
        v = bus_space_read_4(sc->sc_bustag, sc->sc_tr, BE_TRI_MGMTPAL);

        instance = 0;

        if ((v & MGMT_PAL_EXT_MDIO) != 0) {

                mii_attach(&sc->sc_dev, mii, 0xffffffff, BE_PHY_EXTERNAL,
                    MII_OFFSET_ANY, 0);

                child = LIST_FIRST(&mii->mii_phys);
                if (child == NULL) {
                        /* No PHY attached */
                        ifmedia_add(&sc->sc_media,
                            IFM_MAKEWORD(IFM_ETHER,IFM_NONE,0,instance),
                            0, NULL);
                        ifmedia_set(&sc->sc_media,
                            IFM_MAKEWORD(IFM_ETHER,IFM_NONE,0,instance));
                } else {
                        /*
                         * Note: we support just one PHY on the external
                         * MII connector.
                         */
#ifdef DIAGNOSTIC
                        if (LIST_NEXT(child, mii_list) != NULL) {
                                printf("%s: spurious MII device %s attached\n",
                                    sc->sc_dev.dv_xname,
                                    child->mii_dev.dv_xname);
                        }
#endif
                        if (child->mii_phy != BE_PHY_EXTERNAL ||
                            child->mii_inst > 0) {
                                printf("%s: cannot accommodate MII device %s"
                                    " at phy %d, instance %lld\n",
                                    sc->sc_dev.dv_xname,
                                    child->mii_dev.dv_xname,
                                    child->mii_phy, child->mii_inst);
                        } else {
                                sc->sc_phys[instance] = child->mii_phy;
                        }

                        /*
                         * XXX - we can really do the following ONLY if the
                         * phy indeed has the auto negotiation capability!!
                         */
                        ifmedia_set(&sc->sc_media,
                            IFM_MAKEWORD(IFM_ETHER,IFM_AUTO,0,instance));

                        /* Mark our current media setting */
                        be_pal_gate(sc, BE_PHY_EXTERNAL);
                        instance++;
                }

        }

        if ((v & MGMT_PAL_INT_MDIO) != 0) {
                /*
                 * The be internal phy looks vaguely like MII hardware,
                 * but not enough to be able to use the MII device
                 * layer. Hence, we have to take care of media selection
                 * ourselves.
                 */

                sc->sc_mii_inst = instance;
                sc->sc_phys[instance] = BE_PHY_INTERNAL;

                /* Use `ifm_data' to store BMCR bits */
                ifmedia_add(&sc->sc_media,
                    IFM_MAKEWORD(IFM_ETHER,IFM_10_T,0,instance), 0, NULL);
                ifmedia_add(&sc->sc_media,
                    IFM_MAKEWORD(IFM_ETHER,IFM_100_TX,0,instance),
                    BMCR_S100, NULL);
                ifmedia_add(&sc->sc_media,
                    IFM_MAKEWORD(IFM_ETHER,IFM_AUTO,0,instance), 0, NULL);

                printf("on-board transceiver at %s: 10baseT, 100baseTX, auto\n",
                    self->dv_xname);

                be_mii_reset(sc, BE_PHY_INTERNAL);
                /* Only set default medium here if there's no external PHY */
                if (instance == 0) {
                        be_pal_gate(sc, BE_PHY_INTERNAL);
                        ifmedia_set(&sc->sc_media,
                            IFM_MAKEWORD(IFM_ETHER,IFM_AUTO,0,instance));
                } else
                        be_mii_writereg((void *)sc,
                            BE_PHY_INTERNAL, MII_BMCR, BMCR_ISO);
        }

        bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);
        ifp->if_softc = sc;
        ifp->if_start = bestart;
        ifp->if_ioctl = beioctl;
        ifp->if_watchdog = bewatchdog;
        ifp->if_flags =
            IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;

        /* Attach the interface. */
        if_attach(ifp);
        ether_ifattach(ifp);
}


/*
 * Routine to copy from mbuf chain to transmit buffer in
 * network buffer memory.
 */
static __inline__ int
be_put(struct be_softc *sc, int idx, struct mbuf *m)
{
        struct mbuf *n;
        int len, tlen = 0, boff = 0;
        caddr_t bp;

        bp = sc->sc_rb.rb_txbuf + (idx % sc->sc_rb.rb_ntbuf) * BE_PKT_BUF_SZ;

        for (; m; m = n) {
                len = m->m_len;
                if (len == 0) {
                        n = m_free(m);
                        continue;
                }
                bcopy(mtod(m, caddr_t), bp+boff, len);
                boff += len;
                tlen += len;
                n = m_free(m);
        }
        return (tlen);
}

/*
 * Pull data off an interface.
 * Len is the length of data, with local net header stripped.
 * We copy the data into mbufs.  When full cluster sized units are present,
 * we copy into clusters.
 */
static __inline__ struct mbuf *
be_get(struct be_softc *sc, int idx, int totlen)
{
        struct mbuf *m;
        struct mbuf *top, **mp;
        int len, pad, boff = 0;
        caddr_t bp;

        bp = sc->sc_rb.rb_rxbuf + (idx % sc->sc_rb.rb_nrbuf) * BE_PKT_BUF_SZ;

        MGETHDR(m, M_DONTWAIT, MT_DATA);
        if (m == NULL)
                return (NULL);
        m->m_pkthdr.len = totlen;

        pad = ALIGN(sizeof(struct ether_header)) - sizeof(struct ether_header);
        m->m_data += pad;
        len = MHLEN - pad;
        top = NULL;
        mp = &top;

        while (totlen > 0) {
                if (top) {
                        MGET(m, M_DONTWAIT, MT_DATA);
                        if (m == NULL) {
                                m_freem(top);
                                return (NULL);
                        }
                        len = MLEN;
                }
                if (top && totlen >= MINCLSIZE) {
                        MCLGET(m, M_DONTWAIT);
                        if (m->m_flags & M_EXT)
                                len = MCLBYTES;
                }
                m->m_len = len = min(totlen, len);
                bcopy(bp + boff, mtod(m, caddr_t), len);
                boff += len;
                totlen -= len;
                *mp = m;
                mp = &m->m_next;
        }

        return (top);
}

/*
 * Pass a packet to the higher levels.
 */
static __inline__ void
be_read(struct be_softc *sc, int idx, int len)
{
        struct ifnet *ifp = &sc->sc_arpcom.ac_if;
        struct mbuf_list ml = MBUF_LIST_INITIALIZER();
        struct mbuf *m;

        if (len <= sizeof(struct ether_header) ||
            len > ETHERMTU + sizeof(struct ether_header)) {

                printf("%s: invalid packet size %d; dropping\n",
                    ifp->if_xname, len);

                ifp->if_ierrors++;
                return;
        }

        /*
         * Pull packet off interface.
         */
        m = be_get(sc, idx, len);
        if (m == NULL) {
                ifp->if_ierrors++;
                return;
        }

        ml_enqueue(&ml, m);
        if_input(ifp, &ml);
}

/*
 * Start output on interface.
 * We make two assumptions here:
 *  1) that the current priority is set to splnet _before_ this code
 *     is called *and* is returned to the appropriate priority after
 *     return
 *  2) that the IFF_OACTIVE flag is checked before this code is called
 *     (i.e. that the output part of the interface is idle)
 */
void
bestart(struct ifnet *ifp)
{
        struct be_softc *sc = (struct be_softc *)ifp->if_softc;
        struct qec_xd *txd = sc->sc_rb.rb_txd;
        struct mbuf *m;
        unsigned int bix, len;
        unsigned int ntbuf = sc->sc_rb.rb_ntbuf;

        if (!(ifp->if_flags & IFF_RUNNING) || ifq_is_oactive(&ifp->if_snd))
                return;

        bix = sc->sc_rb.rb_tdhead;

        for (;;) {
                m = ifq_dequeue(&ifp->if_snd);
                if (m == NULL)
                        break;

#if NBPFILTER > 0
                /*
                 * If BPF is listening on this interface, let it see the
                 * packet before we commit it to the wire.
                 */
                if (ifp->if_bpf)
                        bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT);
#endif

                /*
                 * Copy the mbuf chain into the transmit buffer.
                 */
                len = be_put(sc, bix, m);

                /*
                 * Initialize transmit registers and start transmission
                 */
                txd[bix].xd_flags = QEC_XD_OWN | QEC_XD_SOP | QEC_XD_EOP |
                                    (len & QEC_XD_LENGTH);
                bus_space_write_4(sc->sc_bustag, sc->sc_cr, BE_CRI_CTRL,
                                  BE_CR_CTRL_TWAKEUP);

                if (++bix == QEC_XD_RING_MAXSIZE)
                        bix = 0;

                if (++sc->sc_rb.rb_td_nbusy == ntbuf) {
                        ifq_set_oactive(&ifp->if_snd);
                        break;
                }
        }

        sc->sc_rb.rb_tdhead = bix;
}

void
bestop(struct be_softc *sc)
{
        int n;
        bus_space_tag_t t = sc->sc_bustag;
        bus_space_handle_t br = sc->sc_br;

        timeout_del(&sc->sc_tick_ch);

        /* Down the MII. */
        mii_down(&sc->sc_mii);
        (void)be_intphy_service(sc, &sc->sc_mii, MII_DOWN);

        /* Stop the transmitter */
        bus_space_write_4(t, br, BE_BRI_TXCFG, 0);
        for (n = 32; n > 0; n--) {
                if (bus_space_read_4(t, br, BE_BRI_TXCFG) == 0)
                        break;
                DELAY(20);
        }

        /* Stop the receiver */
        bus_space_write_4(t, br, BE_BRI_RXCFG, 0);
        for (n = 32; n > 0; n--) {
                if (bus_space_read_4(t, br, BE_BRI_RXCFG) == 0)
                        break;
                DELAY(20);
        }
}

/*
 * Reset interface.
 */
void
bereset(struct be_softc *sc)
{
        int s;

        s = splnet();
        bestop(sc);
        if ((sc->sc_arpcom.ac_if.if_flags & IFF_UP) != 0)
                beinit(sc);
        splx(s);
}

void
bewatchdog(struct ifnet *ifp)
{
        struct be_softc *sc = ifp->if_softc;

        log(LOG_ERR, "%s: device timeout\n", sc->sc_dev.dv_xname);
        ++sc->sc_arpcom.ac_if.if_oerrors;
        bereset(sc);
}

int
beintr(void *v)
{
        struct be_softc *sc = (struct be_softc *)v;
        bus_space_tag_t t = sc->sc_bustag;
        u_int32_t whyq, whyb, whyc;
        int r = 0;

        /* Read QEC status, channel status and BE status */
        whyq = bus_space_read_4(t, sc->sc_qr, QEC_QRI_STAT);
        whyc = bus_space_read_4(t, sc->sc_cr, BE_CRI_STAT);
        whyb = bus_space_read_4(t, sc->sc_br, BE_BRI_STAT);

        if (whyq & QEC_STAT_BM)
                r |= beeint(sc, whyb);

        if (whyq & QEC_STAT_ER)
                r |= beqint(sc, whyc);

        if (whyq & QEC_STAT_TX && whyc & BE_CR_STAT_TXIRQ)
                r |= betint(sc);

        if (whyq & QEC_STAT_RX && whyc & BE_CR_STAT_RXIRQ)
                r |= berint(sc);

        return (r);
}

/*
 * QEC Interrupt.
 */
int
beqint(struct be_softc *sc, u_int32_t why)
{
        int r = 0, rst = 0;

        if (why & BE_CR_STAT_TXIRQ)
                r |= 1;
        if (why & BE_CR_STAT_RXIRQ)
                r |= 1;

        if (why & BE_CR_STAT_BERROR) {
                r |= 1;
                rst = 1;
                printf("%s: bigmac error\n", sc->sc_dev.dv_xname);
        }

        if (why & BE_CR_STAT_TXDERR) {
                r |= 1;
                rst = 1;
                printf("%s: bogus tx descriptor\n", sc->sc_dev.dv_xname);
        }

        if (why & (BE_CR_STAT_TXLERR | BE_CR_STAT_TXPERR | BE_CR_STAT_TXSERR)) {
                r |= 1;
                rst = 1;
                printf("%s: tx dma error ( ", sc->sc_dev.dv_xname);
                if (why & BE_CR_STAT_TXLERR)
                        printf("Late ");
                if (why & BE_CR_STAT_TXPERR)
                        printf("Parity ");
                if (why & BE_CR_STAT_TXSERR)
                        printf("Generic ");
                printf(")\n");
        }

        if (why & BE_CR_STAT_RXDROP) {
                r |= 1;
                rst = 1;
                printf("%s: out of rx descriptors\n", sc->sc_dev.dv_xname);
        }

        if (why & BE_CR_STAT_RXSMALL) {
                r |= 1;
                rst = 1;
                printf("%s: rx descriptor too small\n", sc->sc_dev.dv_xname);
        }

        if (why & (BE_CR_STAT_RXLERR | BE_CR_STAT_RXPERR | BE_CR_STAT_RXSERR)) {
                r |= 1;
                rst = 1;
                printf("%s: rx dma error ( ", sc->sc_dev.dv_xname);
                if (why & BE_CR_STAT_RXLERR)
                        printf("Late ");
                if (why & BE_CR_STAT_RXPERR)
                        printf("Parity ");
                if (why & BE_CR_STAT_RXSERR)
                        printf("Generic ");
                printf(")\n");
        }

        if (!r) {
                rst = 1;
                printf("%s: unexpected error interrupt %08x\n",
                        sc->sc_dev.dv_xname, why);
        }

        if (rst) {
                printf("%s: resetting\n", sc->sc_dev.dv_xname);
                bereset(sc);
        }

        return (r);
}

/*
 * Error interrupt.
 */
int
beeint(struct be_softc *sc, u_int32_t why)
{
        int r = 0, rst = 0;

        if (why & BE_BR_STAT_RFIFOVF) {
                r |= 1;
                rst = 1;
                printf("%s: receive fifo overrun\n", sc->sc_dev.dv_xname);
        }
        if (why & BE_BR_STAT_TFIFO_UND) {
                r |= 1;
                rst = 1;
                printf("%s: transmit fifo underrun\n", sc->sc_dev.dv_xname);
        }
        if (why & BE_BR_STAT_MAXPKTERR) {
                r |= 1;
                rst = 1;
                printf("%s: max packet size error\n", sc->sc_dev.dv_xname);
        }

        if (!r) {
                rst = 1;
                printf("%s: unexpected error interrupt %08x\n",
                        sc->sc_dev.dv_xname, why);
        }

        if (rst) {
                printf("%s: resetting\n", sc->sc_dev.dv_xname);
                bereset(sc);
        }

        return (r);
}

/*
 * Transmit interrupt.
 */
int
betint(struct be_softc *sc)
{
        struct ifnet *ifp = &sc->sc_arpcom.ac_if;
        bus_space_tag_t t = sc->sc_bustag;
        bus_space_handle_t br = sc->sc_br;
        unsigned int bix, txflags;

        /*
         * Unload collision counters
         */
        ifp->if_collisions +=
                bus_space_read_4(t, br, BE_BRI_NCCNT) +
                bus_space_read_4(t, br, BE_BRI_FCCNT) +
                bus_space_read_4(t, br, BE_BRI_EXCNT) +
                bus_space_read_4(t, br, BE_BRI_LTCNT);

        /*
         * the clear the hardware counters
         */
        bus_space_write_4(t, br, BE_BRI_NCCNT, 0);
        bus_space_write_4(t, br, BE_BRI_FCCNT, 0);
        bus_space_write_4(t, br, BE_BRI_EXCNT, 0);
        bus_space_write_4(t, br, BE_BRI_LTCNT, 0);

        bix = sc->sc_rb.rb_tdtail;

        for (;;) {
                if (sc->sc_rb.rb_td_nbusy <= 0)
                        break;

                txflags = sc->sc_rb.rb_txd[bix].xd_flags;

                if (txflags & QEC_XD_OWN)
                        break;

                ifq_clr_oactive(&ifp->if_snd);

                if (++bix == QEC_XD_RING_MAXSIZE)
                        bix = 0;

                --sc->sc_rb.rb_td_nbusy;
        }

        sc->sc_rb.rb_tdtail = bix;

        bestart(ifp);

        if (sc->sc_rb.rb_td_nbusy == 0)
                ifp->if_timer = 0;

        return (1);
}

/*
 * Receive interrupt.
 */
int
berint(struct be_softc *sc)
{
        struct qec_xd *xd = sc->sc_rb.rb_rxd;
        unsigned int bix, len;
        unsigned int nrbuf = sc->sc_rb.rb_nrbuf;

        bix = sc->sc_rb.rb_rdtail;

        /*
         * Process all buffers with valid data.
         */
        for (;;) {
                len = xd[bix].xd_flags;
                if (len & QEC_XD_OWN)
                        break;

                len &= QEC_XD_LENGTH;
                be_read(sc, bix, len);

                /* ... */
                xd[(bix+nrbuf) % QEC_XD_RING_MAXSIZE].xd_flags =
                        QEC_XD_OWN | (BE_PKT_BUF_SZ & QEC_XD_LENGTH);

                if (++bix == QEC_XD_RING_MAXSIZE)
                        bix = 0;
        }

        sc->sc_rb.rb_rdtail = bix;

        return (1);
}

int
beioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
        struct be_softc *sc = ifp->if_softc;
        struct ifreq *ifr = (struct ifreq *)data;
        int s, error = 0;

        s = splnet();

        switch (cmd) {
        case SIOCSIFADDR:
                ifp->if_flags |= IFF_UP;
                beinit(sc);
                break;

        case SIOCSIFFLAGS:
                if ((ifp->if_flags & IFF_UP) == 0 &&
                    (ifp->if_flags & IFF_RUNNING) != 0) {
                        /*
                         * If interface is marked down and it is running, then
                         * stop it.
                         */
                        bestop(sc);
                        ifp->if_flags &= ~IFF_RUNNING;
                } else if ((ifp->if_flags & IFF_UP) != 0 &&
                    (ifp->if_flags & IFF_RUNNING) == 0) {
                        /*
                         * If interface is marked up and it is stopped, then
                         * start it.
                         */
                        beinit(sc);
                } else {
                        /*
                         * Reset the interface to pick up changes in any other
                         * flags that affect hardware registers.
                         */
                        bestop(sc);
                        beinit(sc);
                }
#ifdef BEDEBUG
                if (ifp->if_flags & IFF_DEBUG)
                        sc->sc_debug = 1;
                else
                        sc->sc_debug = 0;
#endif
                break;

        case SIOCGIFMEDIA:
        case SIOCSIFMEDIA:
                error = ifmedia_ioctl(ifp, ifr, &sc->sc_media, cmd);
                break;

        default:
                error = ether_ioctl(ifp, &sc->sc_arpcom, cmd, data);
        }

        if (error == ENETRESET) {
                if (ifp->if_flags & IFF_RUNNING)
                        be_mcreset(sc);
                error = 0;
        }

        splx(s);
        return (error);
}


void
beinit(struct be_softc *sc)
{
        struct ifnet *ifp = &sc->sc_arpcom.ac_if;
        bus_space_tag_t t = sc->sc_bustag;
        bus_space_handle_t br = sc->sc_br;
        bus_space_handle_t cr = sc->sc_cr;
        struct qec_softc *qec = sc->sc_qec;
        u_int32_t v;
        u_int32_t qecaddr;
        u_int8_t *ea;
        int s;

        s = splnet();

        qec_meminit(&sc->sc_rb, BE_PKT_BUF_SZ);

        bestop(sc);

        ea = sc->sc_arpcom.ac_enaddr;
        bus_space_write_4(t, br, BE_BRI_MACADDR0, (ea[0] << 8) | ea[1]);
        bus_space_write_4(t, br, BE_BRI_MACADDR1, (ea[2] << 8) | ea[3]);
        bus_space_write_4(t, br, BE_BRI_MACADDR2, (ea[4] << 8) | ea[5]);

        /* Clear hash table */
        bus_space_write_4(t, br, BE_BRI_HASHTAB0, 0);
        bus_space_write_4(t, br, BE_BRI_HASHTAB1, 0);
        bus_space_write_4(t, br, BE_BRI_HASHTAB2, 0);
        bus_space_write_4(t, br, BE_BRI_HASHTAB3, 0);

        /* Re-initialize RX configuration */
        v = BE_BR_RXCFG_FIFO;
        bus_space_write_4(t, br, BE_BRI_RXCFG, v);

        be_mcreset(sc);

        bus_space_write_4(t, br, BE_BRI_RANDSEED, 0xbd);

        bus_space_write_4(t, br, BE_BRI_XIFCFG,
                          BE_BR_XCFG_ODENABLE | BE_BR_XCFG_RESV);

        bus_space_write_4(t, br, BE_BRI_JSIZE, 4);

        /*
         * Turn off counter expiration interrupts as well as
         * 'gotframe' and 'sentframe'
         */
        bus_space_write_4(t, br, BE_BRI_IMASK,
                          BE_BR_IMASK_GOTFRAME  |
                          BE_BR_IMASK_RCNTEXP   |
                          BE_BR_IMASK_ACNTEXP   |
                          BE_BR_IMASK_CCNTEXP   |
                          BE_BR_IMASK_LCNTEXP   |
                          BE_BR_IMASK_CVCNTEXP  |
                          BE_BR_IMASK_SENTFRAME |
                          BE_BR_IMASK_NCNTEXP   |
                          BE_BR_IMASK_ECNTEXP   |
                          BE_BR_IMASK_LCCNTEXP  |
                          BE_BR_IMASK_FCNTEXP   |
                          BE_BR_IMASK_DTIMEXP);

        /* Channel registers: */
        bus_space_write_4(t, cr, BE_CRI_RXDS, (u_int32_t)sc->sc_rb.rb_rxddma);
        bus_space_write_4(t, cr, BE_CRI_TXDS, (u_int32_t)sc->sc_rb.rb_txddma);

        qecaddr = sc->sc_channel * qec->sc_msize;
        bus_space_write_4(t, cr, BE_CRI_RXWBUF, qecaddr);
        bus_space_write_4(t, cr, BE_CRI_RXRBUF, qecaddr);
        bus_space_write_4(t, cr, BE_CRI_TXWBUF, qecaddr + qec->sc_rsize);
        bus_space_write_4(t, cr, BE_CRI_TXRBUF, qecaddr + qec->sc_rsize);

        bus_space_write_4(t, cr, BE_CRI_RIMASK, 0);
        bus_space_write_4(t, cr, BE_CRI_TIMASK, 0);
        bus_space_write_4(t, cr, BE_CRI_QMASK, 0);
        bus_space_write_4(t, cr, BE_CRI_BMASK, 0);
        bus_space_write_4(t, cr, BE_CRI_CCNT, 0);

        /* Enable transmitter */
        bus_space_write_4(t, br, BE_BRI_TXCFG,
                          BE_BR_TXCFG_FIFO | BE_BR_TXCFG_ENABLE);

        /* Enable receiver */
        v = bus_space_read_4(t, br, BE_BRI_RXCFG);
        v |= BE_BR_RXCFG_FIFO | BE_BR_RXCFG_ENABLE;
        bus_space_write_4(t, br, BE_BRI_RXCFG, v);

        ifp->if_flags |= IFF_RUNNING;
        ifq_clr_oactive(&ifp->if_snd);

        be_ifmedia_upd(ifp);
        timeout_add_sec(&sc->sc_tick_ch, 1);
        splx(s);
}

void
be_mcreset(struct be_softc *sc)
{
        struct arpcom *ac = &sc->sc_arpcom;
        struct ifnet *ifp = &sc->sc_arpcom.ac_if;
        bus_space_tag_t t = sc->sc_bustag;
        bus_space_handle_t br = sc->sc_br;
        u_int32_t crc;
        u_int16_t hash[4];
        u_int8_t octet;
        u_int32_t v;
        int i, j;
        struct ether_multi *enm;
        struct ether_multistep step;

        if (ifp->if_flags & IFF_PROMISC) {
                v = bus_space_read_4(t, br, BE_BRI_RXCFG);
                v |= BE_BR_RXCFG_PMISC;
                bus_space_write_4(t, br, BE_BRI_RXCFG, v);
                return;
        }

        if (ac->ac_multirangecnt > 0)
                ifp->if_flags |= IFF_ALLMULTI;

        if (ifp->if_flags & IFF_ALLMULTI) {
                hash[3] = hash[2] = hash[1] = hash[0] = 0xffff;
                goto chipit;
        }

        hash[3] = hash[2] = hash[1] = hash[0] = 0;

        ETHER_FIRST_MULTI(step, ac, enm);
        while (enm != NULL) {
                crc = 0xffffffff;

                for (i = 0; i < ETHER_ADDR_LEN; i++) {
                        octet = enm->enm_addrlo[i];

                        for (j = 0; j < 8; j++) {
                                if ((crc & 1) ^ (octet & 1)) {
                                        crc >>= 1;
                                        crc ^= MC_POLY_LE;
                                }
                                else
                                        crc >>= 1;
                                octet >>= 1;
                        }
                }

                crc >>= 26;
                hash[crc >> 4] |= 1 << (crc & 0xf);
                ETHER_NEXT_MULTI(step, enm);
        }

        ifp->if_flags &= ~IFF_ALLMULTI;

chipit:
        /* Enable the hash filter */
        bus_space_write_4(t, br, BE_BRI_HASHTAB0, hash[0]);
        bus_space_write_4(t, br, BE_BRI_HASHTAB1, hash[1]);
        bus_space_write_4(t, br, BE_BRI_HASHTAB2, hash[2]);
        bus_space_write_4(t, br, BE_BRI_HASHTAB3, hash[3]);

        v = bus_space_read_4(t, br, BE_BRI_RXCFG);
        v &= ~BE_BR_RXCFG_PMISC;
        v |= BE_BR_RXCFG_HENABLE;
        bus_space_write_4(t, br, BE_BRI_RXCFG, v);
}

/*
 * Set the tcvr to an idle state
 */
void
be_mii_sync(struct be_softc *sc)
{
        bus_space_tag_t t = sc->sc_bustag;
        bus_space_handle_t tr = sc->sc_tr;
        int n = 32;

        while (n--) {
                bus_space_write_4(t, tr, BE_TRI_MGMTPAL,
                    MGMT_PAL_INT_MDIO | MGMT_PAL_EXT_MDIO | MGMT_PAL_OENAB);
                (void)bus_space_read_4(t, tr, BE_TRI_MGMTPAL);
                bus_space_write_4(t, tr, BE_TRI_MGMTPAL,
                    MGMT_PAL_INT_MDIO | MGMT_PAL_EXT_MDIO |
                    MGMT_PAL_OENAB | MGMT_PAL_DCLOCK);
                (void)bus_space_read_4(t, tr, BE_TRI_MGMTPAL);
        }
}

void
be_pal_gate(struct be_softc *sc, int phy)
{
        bus_space_tag_t t = sc->sc_bustag;
        bus_space_handle_t tr = sc->sc_tr;
        u_int32_t v;

        be_mii_sync(sc);

        v = ~(TCVR_PAL_EXTLBACK | TCVR_PAL_MSENSE | TCVR_PAL_LTENABLE);
        if (phy == BE_PHY_INTERNAL)
                v &= ~TCVR_PAL_SERIAL;

        bus_space_write_4(t, tr, BE_TRI_TCVRPAL, v);
        (void)bus_space_read_4(t, tr, BE_TRI_TCVRPAL);
}

static int
be_tcvr_read_bit(struct be_softc *sc, int phy)
{
        bus_space_tag_t t = sc->sc_bustag;
        bus_space_handle_t tr = sc->sc_tr;
        int ret;

        if (phy == BE_PHY_INTERNAL) {
                bus_space_write_4(t, tr, BE_TRI_MGMTPAL, MGMT_PAL_EXT_MDIO);
                (void)bus_space_read_4(t, tr, BE_TRI_MGMTPAL);
                bus_space_write_4(t, tr, BE_TRI_MGMTPAL,
                    MGMT_PAL_EXT_MDIO | MGMT_PAL_DCLOCK);
                (void)bus_space_read_4(t, tr, BE_TRI_MGMTPAL);
                ret = (bus_space_read_4(t, tr, BE_TRI_MGMTPAL) &
                        MGMT_PAL_INT_MDIO) >> MGMT_PAL_INT_MDIO_SHIFT;
        } else {
                bus_space_write_4(t, tr, BE_TRI_MGMTPAL, MGMT_PAL_INT_MDIO);
                (void)bus_space_read_4(t, tr, BE_TRI_MGMTPAL);
                ret = (bus_space_read_4(t, tr, BE_TRI_MGMTPAL) &
                    MGMT_PAL_EXT_MDIO) >> MGMT_PAL_EXT_MDIO_SHIFT;
                bus_space_write_4(t, tr, BE_TRI_MGMTPAL,
                    MGMT_PAL_INT_MDIO | MGMT_PAL_DCLOCK);
                (void)bus_space_read_4(t, tr, BE_TRI_MGMTPAL);
        }

        return (ret);
}

static void
be_tcvr_write_bit(struct be_softc *sc, int phy, int bit)
{
        bus_space_tag_t t = sc->sc_bustag;
        bus_space_handle_t tr = sc->sc_tr;
        u_int32_t v;

        if (phy == BE_PHY_INTERNAL) {
                v = ((bit & 1) << MGMT_PAL_INT_MDIO_SHIFT) |
                    MGMT_PAL_OENAB | MGMT_PAL_EXT_MDIO;
        } else {
                v = ((bit & 1) << MGMT_PAL_EXT_MDIO_SHIFT)
                    | MGMT_PAL_OENAB | MGMT_PAL_INT_MDIO;
        }
        bus_space_write_4(t, tr, BE_TRI_MGMTPAL, v);
        (void)bus_space_read_4(t, tr, BE_TRI_MGMTPAL);
        bus_space_write_4(t, tr, BE_TRI_MGMTPAL, v | MGMT_PAL_DCLOCK);
        (void)bus_space_read_4(t, tr, BE_TRI_MGMTPAL);
}

static void
be_mii_sendbits(struct be_softc *sc, int phy, u_int32_t data, int nbits)
{
        int i;

        for (i = 1 << (nbits - 1); i != 0; i >>= 1)
                be_tcvr_write_bit(sc, phy, (data & i) != 0);
}

static int
be_mii_readreg(struct device *self, int phy, int reg)
{
        struct be_softc *sc = (struct be_softc *)self;
        int val = 0, i;

        /*
         * Read the PHY register by manually driving the MII control lines.
         */
        be_mii_sync(sc);
        be_mii_sendbits(sc, phy, MII_COMMAND_START, 2);
        be_mii_sendbits(sc, phy, MII_COMMAND_READ, 2);
        be_mii_sendbits(sc, phy, phy, 5);
        be_mii_sendbits(sc, phy, reg, 5);

        (void) be_tcvr_read_bit(sc, phy);
        (void) be_tcvr_read_bit(sc, phy);

        for (i = 15; i >= 0; i--)
                val |= (be_tcvr_read_bit(sc, phy) << i);

        (void) be_tcvr_read_bit(sc, phy);
        (void) be_tcvr_read_bit(sc, phy);
        (void) be_tcvr_read_bit(sc, phy);

        return (val);
}

void
be_mii_writereg(struct device *self, int phy, int reg, int val)
{
        struct be_softc *sc = (struct be_softc *)self;
        int i;

        /*
         * Write the PHY register by manually driving the MII control lines.
         */
        be_mii_sync(sc);
        be_mii_sendbits(sc, phy, MII_COMMAND_START, 2);
        be_mii_sendbits(sc, phy, MII_COMMAND_WRITE, 2);
        be_mii_sendbits(sc, phy, phy, 5);
        be_mii_sendbits(sc, phy, reg, 5);

        be_tcvr_write_bit(sc, phy, 1);
        be_tcvr_write_bit(sc, phy, 0);

        for (i = 15; i >= 0; i--)
                be_tcvr_write_bit(sc, phy, (val >> i) & 1);
}

int
be_mii_reset(struct be_softc *sc, int phy)
{
        int n;

        be_mii_writereg((struct device *)sc, phy, MII_BMCR,
            BMCR_LOOP | BMCR_PDOWN | BMCR_ISO);
        be_mii_writereg((struct device *)sc, phy, MII_BMCR, BMCR_RESET);

        for (n = 16; n >= 0; n--) {
                int bmcr = be_mii_readreg((struct device *)sc, phy, MII_BMCR);
                if ((bmcr & BMCR_RESET) == 0)
                        break;
                DELAY(20);
        }
        if (n == 0) {
                printf("%s: bmcr reset failed\n", sc->sc_dev.dv_xname);
                return (EIO);
        }

        return (0);
}

void
be_tick(void *arg)
{
        struct be_softc *sc = arg;
        int s = splnet();

        mii_tick(&sc->sc_mii);
        (void)be_intphy_service(sc, &sc->sc_mii, MII_TICK);

        timeout_add_sec(&sc->sc_tick_ch, 1);
        splx(s);
}

void
be_mii_statchg(struct device *self)
{
        struct be_softc *sc = (struct be_softc *)self;
        bus_space_tag_t t = sc->sc_bustag;
        bus_space_handle_t br = sc->sc_br;
        u_int64_t instance;
        u_int32_t v;

        instance = IFM_INST(sc->sc_mii.mii_media.ifm_cur->ifm_media);
#ifdef DIAGNOSTIC
        if (instance > 1)
                panic("be_mii_statchg: instance %lld out of range", instance);
#endif

        /* Update duplex mode in TX configuration */
        v = bus_space_read_4(t, br, BE_BRI_TXCFG);
        if ((IFM_OPTIONS(sc->sc_mii.mii_media_active) & IFM_FDX) != 0)
                v |= BE_BR_TXCFG_FULLDPLX;
        else
                v &= ~BE_BR_TXCFG_FULLDPLX;
        bus_space_write_4(t, br, BE_BRI_TXCFG, v);

        /* Change to appropriate gate in transceiver PAL */
        be_pal_gate(sc, sc->sc_phys[instance]);
}

/*
 * Get current media settings.
 */
void
be_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
{
        struct be_softc *sc = ifp->if_softc;

        mii_pollstat(&sc->sc_mii);
        (void)be_intphy_service(sc, &sc->sc_mii, MII_POLLSTAT);

        ifmr->ifm_status = sc->sc_mii.mii_media_status;
        ifmr->ifm_active = sc->sc_mii.mii_media_active;
        return;
}

/*
 * Set media options.
 */
int
be_ifmedia_upd(struct ifnet *ifp)
{
        struct be_softc *sc = ifp->if_softc;
        int error;

        if ((error = mii_mediachg(&sc->sc_mii)) != 0)
                return (error);

        return (be_intphy_service(sc, &sc->sc_mii, MII_MEDIACHG));
}

/*
 * Service routine for our pseudo-MII internal transceiver.
 */
int
be_intphy_service(struct be_softc *sc, struct mii_data *mii, int cmd)
{
        struct ifmedia_entry *ife = mii->mii_media.ifm_cur;
        int bmcr, bmsr;
        int error;

        switch (cmd) {
        case MII_POLLSTAT:
                /*
                 * If we're not polling our PHY instance, just return.
                 */
                if (IFM_INST(ife->ifm_media) != sc->sc_mii_inst)
                        return (0);

                break;

        case MII_MEDIACHG:

                /*
                 * If the media indicates a different PHY instance,
                 * isolate ourselves.
                 */
                if (IFM_INST(ife->ifm_media) != sc->sc_mii_inst) {
                        bmcr = be_mii_readreg((void *)sc,
                            BE_PHY_INTERNAL, MII_BMCR);
                        be_mii_writereg((void *)sc,
                            BE_PHY_INTERNAL, MII_BMCR, bmcr | BMCR_ISO);
                        sc->sc_mii_flags &= ~MIIF_HAVELINK;
                        sc->sc_intphy_curspeed = 0;
                        return (0);
                }


                if ((error = be_mii_reset(sc, BE_PHY_INTERNAL)) != 0)
                        return (error);

                bmcr = be_mii_readreg((void *)sc, BE_PHY_INTERNAL, MII_BMCR);

                /*
                 * Select the new mode and take out of isolation
                 */
                if (IFM_SUBTYPE(ife->ifm_media) == IFM_100_TX)
                        bmcr |= BMCR_S100;
                else if (IFM_SUBTYPE(ife->ifm_media) == IFM_10_T)
                        bmcr &= ~BMCR_S100;
                else if (IFM_SUBTYPE(ife->ifm_media) == IFM_AUTO) {
                        if ((sc->sc_mii_flags & MIIF_HAVELINK) != 0) {
                                bmcr &= ~BMCR_S100;
                                bmcr |= sc->sc_intphy_curspeed;
                        } else {
                                /* Keep isolated until link is up */
                                bmcr |= BMCR_ISO;
                                sc->sc_mii_flags |= MIIF_DOINGAUTO;
                        }
                }

                if ((IFM_OPTIONS(ife->ifm_media) & IFM_FDX) != 0)
                        bmcr |= BMCR_FDX;
                else
                        bmcr &= ~BMCR_FDX;

                be_mii_writereg((void *)sc, BE_PHY_INTERNAL, MII_BMCR, bmcr);
                break;

        case MII_TICK:
                /*
                 * If we're not currently selected, just return.
                 */
                if (IFM_INST(ife->ifm_media) != sc->sc_mii_inst)
                        return (0);

                /* Only used for automatic media selection */
                if (IFM_SUBTYPE(ife->ifm_media) != IFM_AUTO)
                        return (0);

                /* Is the interface even up? */
                if ((mii->mii_ifp->if_flags & IFF_UP) == 0)
                        return (0);

                /*
                 * Check link status; if we don't have a link, try another
                 * speed. We can't detect duplex mode, so half-duplex is
                 * what we have to settle for.
                 */

                /* Read twice in case the register is latched */
                bmsr = be_mii_readreg((void *)sc, BE_PHY_INTERNAL, MII_BMSR) |
                    be_mii_readreg((void *)sc, BE_PHY_INTERNAL, MII_BMSR);

                if ((bmsr & BMSR_LINK) != 0) {
                        /* We have a carrier */
                        bmcr = be_mii_readreg((void *)sc,
                            BE_PHY_INTERNAL, MII_BMCR);

                        if ((sc->sc_mii_flags & MIIF_DOINGAUTO) != 0) {
                                bmcr = be_mii_readreg((void *)sc,
                                    BE_PHY_INTERNAL, MII_BMCR);

                                sc->sc_mii_flags |= MIIF_HAVELINK;
                                sc->sc_intphy_curspeed = (bmcr & BMCR_S100);
                                sc->sc_mii_flags &= ~MIIF_DOINGAUTO;

                                bmcr &= ~BMCR_ISO;
                                be_mii_writereg((void *)sc,
                                    BE_PHY_INTERNAL, MII_BMCR, bmcr);

                                printf("%s: link up at %s Mbps\n",
                                    sc->sc_dev.dv_xname,
                                    (bmcr & BMCR_S100) ? "100" : "10");
                        }
                        sc->sc_mii_ticks = 0;
                        return (0);
                }

                if ((sc->sc_mii_flags & MIIF_DOINGAUTO) == 0) {
                        sc->sc_mii_flags |= MIIF_DOINGAUTO;
                        sc->sc_mii_flags &= ~MIIF_HAVELINK;
                        sc->sc_intphy_curspeed = 0;
                        printf("%s: link down\n", sc->sc_dev.dv_xname);
                }

                /* Only retry autonegotiation every 5 seconds. */
                if (++sc->sc_mii_ticks < 5)
                        return(0);

                sc->sc_mii_ticks = 0;
                bmcr = be_mii_readreg((void *)sc, BE_PHY_INTERNAL, MII_BMCR);
                /* Just flip the fast speed bit */
                bmcr ^= BMCR_S100;
                be_mii_writereg((void *)sc, BE_PHY_INTERNAL, MII_BMCR, bmcr);

                break;

        case MII_DOWN:
                /* Isolate this phy */
                bmcr = be_mii_readreg((void *)sc, BE_PHY_INTERNAL, MII_BMCR);
                be_mii_writereg((void *)sc,
                    BE_PHY_INTERNAL, MII_BMCR, bmcr | BMCR_ISO);
                return (0);
        }

        /* Update the media status. */
        be_intphy_status(sc);

        /* Callback if something changed. */
        if (sc->sc_mii_active != mii->mii_media_active || cmd == MII_MEDIACHG) {
                (*mii->mii_statchg)((struct device *)sc);
                sc->sc_mii_active = mii->mii_media_active;
        }
        return (0);
}

/*
 * Determine status of internal transceiver
 */
void
be_intphy_status(struct be_softc *sc)
{
        struct mii_data *mii = &sc->sc_mii;
        uint64_t media_active, media_status;
        int bmcr, bmsr;

        media_status = IFM_AVALID;
        media_active = 0;

        /*
         * Internal transceiver; do the work here.
         */
        bmcr = be_mii_readreg((struct device *)sc, BE_PHY_INTERNAL, MII_BMCR);

        switch (bmcr & (BMCR_S100 | BMCR_FDX)) {
        case (BMCR_S100 | BMCR_FDX):
                media_active = IFM_ETHER | IFM_100_TX | IFM_FDX;
                break;
        case BMCR_S100:
                media_active = IFM_ETHER | IFM_100_TX | IFM_HDX;
                break;
        case BMCR_FDX:
                media_active = IFM_ETHER | IFM_10_T | IFM_FDX;
                break;
        case 0:
                media_active = IFM_ETHER | IFM_10_T | IFM_HDX;
                break;
        }

        /* Read twice in case the register is latched */
        bmsr = be_mii_readreg((struct device *)sc, BE_PHY_INTERNAL, MII_BMSR)|
               be_mii_readreg((struct device *)sc, BE_PHY_INTERNAL, MII_BMSR);
        if (bmsr & BMSR_LINK)
                media_status |= IFM_ACTIVE;

        mii->mii_media_status = media_status;
        mii->mii_media_active = media_active;
}