/*      $NetBSD: if_de.c,v 1.86 1999/06/01 19:17:59 thorpej Exp $       */
/*-
 * Copyright (c) 1994-1997 Matt Thomas (matt@3am-software.com)
 * 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. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
 *
 * Id: if_de.c,v 1.94 1997/07/03 16:55:07 thomas Exp
 */

/*
 * DEC 21040 PCI Ethernet Controller
 *
 * Written by Matt Thomas
 * BPF support code stolen directly from if_ec.c
 *
 *   This driver supports the DEC DE435 or any other PCI
 *   board which support 21040, 21041, or 21140 (mostly).
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: head/sys/dev/de/if_de.c 271849 2014-09-19 03:51:26Z glebius $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/endian.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/eventhandler.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/interrupt.h>

#include "opt_inet.h"

#include <net/if.h>
#include <net/if_media.h>
#include <net/if_dl.h>
#include <net/ifq_var.h>
#include <net/bpf.h>

#ifdef INET
#include <netinet/in.h>
#include <netinet/if_ether.h>
#endif

#include <vm/vm.h>

#include <net/if_var.h>
#include <vm/pmap.h>
#include <bus/pci/pcivar.h>
#include <bus/pci/pcireg.h>
#include <dev/netif/de/dc21040reg.h>

/*
 * Intel CPUs should use I/O mapped access.
 */
#if defined(__x86_64__)
#define TULIP_IOMAPPED
#endif

#define TULIP_HZ        10

#include "if_devar.h"

#define SYNC_NONE       0
#define SYNC_RX         1
#define SYNC_TX         2

static tulip_softc_t *tulips[TULIP_MAX_DEVICES];

/*
 * This module supports
 *      the DEC 21040 PCI Ethernet Controller.
 *      the DEC 21041 PCI Ethernet Controller.
 *      the DEC 21140 PCI Fast Ethernet Controller.
 */
static void     tulip_mii_autonegotiate(tulip_softc_t *, u_int);
static void     tulip_intr_shared(void *);
static void     tulip_intr_normal(void *);
static void     tulip_init(tulip_softc_t *);
static void     tulip_reset(tulip_softc_t *);
static void     tulip_ifstart(struct ifnet *, struct ifaltq_subque *);
static struct mbuf *tulip_txput(tulip_softc_t *, struct mbuf *);
static void     tulip_txput_setup(tulip_softc_t *);
static void     tulip_rx_intr(tulip_softc_t *);
static void     tulip_addr_filter(tulip_softc_t *);
static u_int    tulip_mii_readreg(tulip_softc_t *, u_int, u_int);
static void     tulip_mii_writereg(tulip_softc_t *, u_int, u_int, u_int);
static int      tulip_mii_map_abilities(tulip_softc_t * const sc, unsigned abilities);
static tulip_media_t tulip_mii_phy_readspecific(tulip_softc_t *);
static int      tulip_srom_decode(tulip_softc_t *);
static int      tulip_ifmedia_change(struct ifnet *);
static void     tulip_ifmedia_status(struct ifnet *, struct ifmediareq *);
static struct mbuf *tulip_dequeue_mbuf(tulip_ringinfo_t *ri, tulip_descinfo_t *di,
                    int sync);
static void     tulip_dma_map_addr(void *, bus_dma_segment_t *, int, int);
static void     tulip_dma_map_rxbuf(void *, bus_dma_segment_t *, int,
                    bus_size_t, int);
static void     tulip_ifinit(void *);

static void
tulip_dma_map_addr(void *arg, bus_dma_segment_t *segs, int nseg, int error)
{
    bus_addr_t *paddr;

    if (error)
        return;

    paddr = arg;
    *paddr = segs->ds_addr;
}

static void
tulip_dma_map_rxbuf(void *arg, bus_dma_segment_t *segs, int nseg,
    bus_size_t mapsize, int error)
{
    tulip_desc_t *desc;

    if (error)
        return;

    desc = arg;
    KASSERT(nseg == 1, ("too many DMA segments"));
    KASSERT(segs[0].ds_len >= TULIP_RX_BUFLEN, ("receive buffer too small"));

    desc->d_addr1 = segs[0].ds_addr & 0xffffffff;
    desc->d_length1 = TULIP_RX_BUFLEN;
#ifdef not_needed
    /* These should already always be zero. */
    desc->d_addr2 = 0;
    desc->d_length2 = 0;
#endif
}

static struct mbuf *
tulip_dequeue_mbuf(tulip_ringinfo_t *ri, tulip_descinfo_t *di, int sync)
{
    struct mbuf *m;

    m = di->di_mbuf;
    if (m != NULL) {
        switch (sync) {
        case SYNC_NONE:
            break;
        case SYNC_RX:
            TULIP_RXMAP_POSTSYNC(ri, di);
            break;
        case SYNC_TX:
            TULIP_TXMAP_POSTSYNC(ri, di);
            break;
        default:
            panic("bad sync flag: %d", sync);
        }
        bus_dmamap_unload(ri->ri_data_tag, *di->di_map);
        di->di_mbuf = NULL;
    }
    return (m);
}

static void
tulip_timeout_callback(void *arg)
{
    tulip_softc_t *sc = arg;

    lwkt_serialize_enter(sc->arpcom.ac_if.if_serializer);
    sc->tulip_flags &= ~TULIP_TIMEOUTPENDING;
    sc->tulip_probe_timeout -= 1000 / TULIP_HZ;
    (sc->tulip_boardsw->bd_media_poll)(sc, TULIP_MEDIAPOLL_TIMER);
    lwkt_serialize_exit(sc->arpcom.ac_if.if_serializer);
}

static void
tulip_timeout(tulip_softc_t *sc)
{
    if (sc->tulip_flags & TULIP_TIMEOUTPENDING)
        return;
    sc->tulip_flags |= TULIP_TIMEOUTPENDING;
    callout_reset(&sc->tulip_callout, (hz + TULIP_HZ / 2) / TULIP_HZ,
        tulip_timeout_callback, sc);
}

static int
tulip_txprobe(tulip_softc_t *sc)
{
    struct mbuf *m;

    /*
     * Before we are sure this is the right media we need
     * to send a small packet to make sure there's carrier.
     * Strangely, BNC and AUI will "see" receive data if
     * either is connected so the transmit is the only way
     * to verify the connectivity.
     */
    MGETHDR(m, M_NOWAIT, MT_DATA);
    if (m == NULL)
        return 0;
    /*
     * Construct a LLC TEST message which will point to ourselves.
     */
    bcopy(sc->arpcom.ac_enaddr, mtod(m, struct ether_header *)->ether_dhost,
        ETHER_ADDR_LEN);
    bcopy(sc->arpcom.ac_enaddr, mtod(m, struct ether_header *)->ether_shost,
        ETHER_ADDR_LEN);
    mtod(m, struct ether_header *)->ether_type = htons(3);
    mtod(m, unsigned char *)[14] = 0;
    mtod(m, unsigned char *)[15] = 0;
    mtod(m, unsigned char *)[16] = 0xE3;        /* LLC Class1 TEST (no poll) */
    m->m_len = m->m_pkthdr.len = sizeof(struct ether_header) + 3;
    /*
     * send it!
     */
    sc->tulip_cmdmode |= TULIP_CMD_TXRUN;
    sc->tulip_intrmask |= TULIP_STS_TXINTR;
    sc->tulip_flags |= TULIP_TXPROBE_ACTIVE;
    TULIP_CSR_WRITE(sc, csr_command, sc->tulip_cmdmode);
    TULIP_CSR_WRITE(sc, csr_intr, sc->tulip_intrmask);
    if ((m = tulip_txput(sc, m)) != NULL)
        m_freem(m);
    sc->tulip_probe.probe_txprobes++;
    return 1;
}

static void
tulip_media_set(tulip_softc_t *sc, tulip_media_t media)
{
    const tulip_media_info_t *mi = sc->tulip_mediums[media];

    if (mi == NULL)
        return;

    /*
     * If we are switching media, make sure we don't think there's
     * any stale RX activity
     */
    sc->tulip_flags &= ~TULIP_RXACT;
    if (mi->mi_type == TULIP_MEDIAINFO_SIA) {
        TULIP_CSR_WRITE(sc, csr_sia_connectivity, TULIP_SIACONN_RESET);
        TULIP_CSR_WRITE(sc, csr_sia_tx_rx,        mi->mi_sia_tx_rx);
        if (sc->tulip_features & TULIP_HAVE_SIAGP) {
            TULIP_CSR_WRITE(sc, csr_sia_general,  mi->mi_sia_gp_control|mi->mi_sia_general);
            DELAY(50);
            TULIP_CSR_WRITE(sc, csr_sia_general,  mi->mi_sia_gp_data|mi->mi_sia_general);
        } else {
            TULIP_CSR_WRITE(sc, csr_sia_general,  mi->mi_sia_general);
        }
        TULIP_CSR_WRITE(sc, csr_sia_connectivity, mi->mi_sia_connectivity);
    } else if (mi->mi_type == TULIP_MEDIAINFO_GPR) {
#define TULIP_GPR_CMDBITS       (TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION|TULIP_CMD_SCRAMBLER|TULIP_CMD_TXTHRSHLDCTL)
        /*
         * If the cmdmode bits don't match the currently operating mode,
         * set the cmdmode appropriately and reset the chip.
         */
        if (((mi->mi_cmdmode ^ TULIP_CSR_READ(sc, csr_command)) & TULIP_GPR_CMDBITS) != 0) {
            sc->tulip_cmdmode &= ~TULIP_GPR_CMDBITS;
            sc->tulip_cmdmode |= mi->mi_cmdmode;
            tulip_reset(sc);
        }
        TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_PINSET|sc->tulip_gpinit);
        DELAY(10);
        TULIP_CSR_WRITE(sc, csr_gp, (u_int8_t) mi->mi_gpdata);
    } else if (mi->mi_type == TULIP_MEDIAINFO_SYM) {
        /*
         * If the cmdmode bits don't match the currently operating mode,
         * set the cmdmode appropriately and reset the chip.
         */
        if (((mi->mi_cmdmode ^ TULIP_CSR_READ(sc, csr_command)) & TULIP_GPR_CMDBITS) != 0) {
            sc->tulip_cmdmode &= ~TULIP_GPR_CMDBITS;
            sc->tulip_cmdmode |= mi->mi_cmdmode;
            tulip_reset(sc);
        }
        TULIP_CSR_WRITE(sc, csr_sia_general, mi->mi_gpcontrol);
        TULIP_CSR_WRITE(sc, csr_sia_general, mi->mi_gpdata);
    } else if (mi->mi_type == TULIP_MEDIAINFO_MII
               && sc->tulip_probe_state != TULIP_PROBE_INACTIVE) {
        int idx;
        if (sc->tulip_features & TULIP_HAVE_SIAGP) {
            const u_int8_t *dp;
            dp = &sc->tulip_rombuf[mi->mi_reset_offset];
            for (idx = 0; idx < mi->mi_reset_length; idx++, dp += 2) {
                DELAY(10);
                TULIP_CSR_WRITE(sc, csr_sia_general, (dp[0] + 256 * dp[1]) << 16);
            }
            sc->tulip_phyaddr = mi->mi_phyaddr;
            dp = &sc->tulip_rombuf[mi->mi_gpr_offset];
            for (idx = 0; idx < mi->mi_gpr_length; idx++, dp += 2) {
                DELAY(10);
                TULIP_CSR_WRITE(sc, csr_sia_general, (dp[0] + 256 * dp[1]) << 16);
            }
        } else {
            for (idx = 0; idx < mi->mi_reset_length; idx++) {
                DELAY(10);
                TULIP_CSR_WRITE(sc, csr_gp, sc->tulip_rombuf[mi->mi_reset_offset + idx]);
            }
            sc->tulip_phyaddr = mi->mi_phyaddr;
            for (idx = 0; idx < mi->mi_gpr_length; idx++) {
                DELAY(10);
                TULIP_CSR_WRITE(sc, csr_gp, sc->tulip_rombuf[mi->mi_gpr_offset + idx]);
            }
        }
        if (sc->tulip_flags & TULIP_TRYNWAY) {
            tulip_mii_autonegotiate(sc, sc->tulip_phyaddr);
        } else if ((sc->tulip_flags & TULIP_DIDNWAY) == 0) {
            u_int32_t data = tulip_mii_readreg(sc, sc->tulip_phyaddr, PHYREG_CONTROL);
            data &= ~(PHYCTL_SELECT_100MB|PHYCTL_FULL_DUPLEX|PHYCTL_AUTONEG_ENABLE);
            sc->tulip_flags &= ~TULIP_DIDNWAY;
            if (TULIP_IS_MEDIA_FD(media))
                data |= PHYCTL_FULL_DUPLEX;
            if (TULIP_IS_MEDIA_100MB(media))
                data |= PHYCTL_SELECT_100MB;
            tulip_mii_writereg(sc, sc->tulip_phyaddr, PHYREG_CONTROL, data);
        }
    }
}

static void
tulip_linkup(tulip_softc_t *sc, tulip_media_t media)
{
    if ((sc->tulip_flags & TULIP_LINKUP) == 0)
        sc->tulip_flags |= TULIP_PRINTLINKUP;
    sc->tulip_flags |= TULIP_LINKUP;
    ifq_clr_oactive(&sc->arpcom.ac_if.if_snd);
#if 0 /* XXX how does with work with ifmedia? */
    if ((sc->tulip_flags & TULIP_DIDNWAY) == 0) {
        if (sc->arpcom.ac_if.if_flags & IFF_FULLDUPLEX) {
            if (TULIP_CAN_MEDIA_FD(media)
                    && sc->tulip_mediums[TULIP_FD_MEDIA_OF(media)] != NULL)
                media = TULIP_FD_MEDIA_OF(media);
        } else {
            if (TULIP_IS_MEDIA_FD(media)
                    && sc->tulip_mediums[TULIP_HD_MEDIA_OF(media)] != NULL)
                media = TULIP_HD_MEDIA_OF(media);
        }
    }
#endif
    if (sc->tulip_media != media) {
        sc->tulip_media = media;
        sc->tulip_flags |= TULIP_PRINTMEDIA;
        if (TULIP_IS_MEDIA_FD(sc->tulip_media)) {
            sc->tulip_cmdmode |= TULIP_CMD_FULLDUPLEX;
        } else if (sc->tulip_chipid != TULIP_21041 || (sc->tulip_flags & TULIP_DIDNWAY) == 0) {
            sc->tulip_cmdmode &= ~TULIP_CMD_FULLDUPLEX;
        }
    }
    /*
     * We could set probe_timeout to 0 but setting to 3000 puts this
     * in one central place and the only matters is tulip_link is
     * followed by a tulip_timeout.  Therefore setting it should not
     * result in aberrant behavour.
     */
    sc->tulip_probe_timeout = 3000;
    sc->tulip_probe_state = TULIP_PROBE_INACTIVE;
    sc->tulip_flags &= ~(TULIP_TXPROBE_ACTIVE|TULIP_TRYNWAY);
    if (sc->tulip_flags & TULIP_INRESET) {
        tulip_media_set(sc, sc->tulip_media);
    } else if (sc->tulip_probe_media != sc->tulip_media) {
        /*
         * No reason to change media if we have the right media.
         */
        tulip_reset(sc);
    }
    tulip_init(sc);
}

static void
tulip_media_print(tulip_softc_t *sc)
{
    if ((sc->tulip_flags & TULIP_LINKUP) == 0)
        return;
    if (sc->tulip_flags & TULIP_PRINTMEDIA) {
        if_printf(&sc->arpcom.ac_if, "enabling %s port\n",
            tulip_mediums[sc->tulip_media]);
        sc->tulip_flags &= ~(TULIP_PRINTMEDIA|TULIP_PRINTLINKUP);
    } else if (sc->tulip_flags & TULIP_PRINTLINKUP) {
        if_printf(&sc->arpcom.ac_if, "link up\n");
        sc->tulip_flags &= ~TULIP_PRINTLINKUP;
    }
}

static tulip_link_status_t
tulip_media_link_monitor(tulip_softc_t *sc)
{
    const tulip_media_info_t *mi = sc->tulip_mediums[sc->tulip_media];
    tulip_link_status_t linkup = TULIP_LINK_DOWN;

    if (mi == NULL) {
#if defined(DIAGNOSTIC)
        panic("tulip_media_link_monitor: %s: botch at line %d\n",
              tulip_mediums[sc->tulip_media],__LINE__);
#endif
        return TULIP_LINK_UNKNOWN;
    }


    /*
     * Have we seen some packets?  If so, the link must be good.
     */
    if ((sc->tulip_flags & (TULIP_RXACT|TULIP_LINKUP)) == (TULIP_RXACT|TULIP_LINKUP)) {
        sc->tulip_flags &= ~TULIP_RXACT;
        sc->tulip_probe_timeout = 3000;
        return TULIP_LINK_UP;
    }

    sc->tulip_flags &= ~TULIP_RXACT;
    if (mi->mi_type == TULIP_MEDIAINFO_MII) {
        u_int32_t status;
        /*
         * Read the PHY status register.
         */
        status = tulip_mii_readreg(sc, sc->tulip_phyaddr, PHYREG_STATUS);
        if (status & PHYSTS_AUTONEG_DONE) {
            /*
             * If the PHY has completed autonegotiation, see the if the
             * remote systems abilities have changed.  If so, upgrade or
             * downgrade as appropriate.
             */
            u_int32_t abilities = tulip_mii_readreg(sc, sc->tulip_phyaddr, PHYREG_AUTONEG_ABILITIES);
            abilities = (abilities << 6) & status;
            if (abilities != sc->tulip_abilities) {
                if (tulip_mii_map_abilities(sc, abilities)) {
                    tulip_linkup(sc, sc->tulip_probe_media);
                    return TULIP_LINK_UP;
                }
                /*
                 * if we had selected media because of autonegotiation,
                 * we need to probe for the new media.
                 */
                sc->tulip_probe_state = TULIP_PROBE_INACTIVE;
                if (sc->tulip_flags & TULIP_DIDNWAY)
                    return TULIP_LINK_DOWN;
            }
        }
        /*
         * The link is now up.  If was down, say its back up.
         */
        if ((status & (PHYSTS_LINK_UP|PHYSTS_REMOTE_FAULT)) == PHYSTS_LINK_UP)
            linkup = TULIP_LINK_UP;
    } else if (mi->mi_type == TULIP_MEDIAINFO_GPR) {
        /*
         * No activity sensor?  Assume all's well.
         */
        if (mi->mi_actmask == 0)
            return TULIP_LINK_UNKNOWN;
        /*
         * Does the activity data match?
         */
        if ((TULIP_CSR_READ(sc, csr_gp) & mi->mi_actmask) == mi->mi_actdata)
            linkup = TULIP_LINK_UP;
    } else if (mi->mi_type == TULIP_MEDIAINFO_SIA) {
        /*
         * Assume non TP ok for now.
         */
        if (!TULIP_IS_MEDIA_TP(sc->tulip_media))
            return TULIP_LINK_UNKNOWN;
        if ((TULIP_CSR_READ(sc, csr_sia_status) & TULIP_SIASTS_LINKFAIL) == 0)
            linkup = TULIP_LINK_UP;
    } else if (mi->mi_type == TULIP_MEDIAINFO_SYM) {
        return TULIP_LINK_UNKNOWN;
    }
    /*
     * We will wait for 3 seconds until the link goes into suspect mode.
     */
    if (sc->tulip_flags & TULIP_LINKUP) {
        if (linkup == TULIP_LINK_UP)
            sc->tulip_probe_timeout = 3000;
        if (sc->tulip_probe_timeout > 0)
            return TULIP_LINK_UP;

        sc->tulip_flags &= ~TULIP_LINKUP;
        if_printf(&sc->arpcom.ac_if, "link down: cable problem?\n");
    }
    return TULIP_LINK_DOWN;
}

static void
tulip_media_poll(tulip_softc_t *sc, tulip_mediapoll_event_t event)
{
    if (sc->tulip_probe_state == TULIP_PROBE_INACTIVE
            && event == TULIP_MEDIAPOLL_TIMER) {
        switch (tulip_media_link_monitor(sc)) {
            case TULIP_LINK_DOWN: {
                /*
                 * Link Monitor failed.  Probe for new media.
                 */
                event = TULIP_MEDIAPOLL_LINKFAIL;
                break;
            }
            case TULIP_LINK_UP: {
                /*
                 * Check again soon.
                 */
                tulip_timeout(sc);
                return;
            }
            case TULIP_LINK_UNKNOWN: {
                /*
                 * We can't tell so don't bother.
                 */
                return;
            }
        }
    }

    if (event == TULIP_MEDIAPOLL_LINKFAIL) {
        if (sc->tulip_probe_state == TULIP_PROBE_INACTIVE) {
            if (TULIP_DO_AUTOSENSE(sc)) {
                sc->tulip_media = TULIP_MEDIA_UNKNOWN;
                if (sc->arpcom.ac_if.if_flags & IFF_UP)
                    tulip_reset(sc);    /* restart probe */
            }
            return;
        }
    }

    if (event == TULIP_MEDIAPOLL_START) {
        ifq_set_oactive(&sc->arpcom.ac_if.if_snd);
        if (sc->tulip_probe_state != TULIP_PROBE_INACTIVE)
            return;
        sc->tulip_probe_mediamask = 0;
        sc->tulip_probe_passes = 0;
        /*
         * If the SROM contained an explicit media to use, use it.
         */
        sc->tulip_cmdmode &= ~(TULIP_CMD_RXRUN|TULIP_CMD_FULLDUPLEX);
        sc->tulip_flags |= TULIP_TRYNWAY|TULIP_PROBE1STPASS;
        sc->tulip_flags &= ~(TULIP_DIDNWAY|TULIP_PRINTMEDIA|TULIP_PRINTLINKUP);
        /*
         * connidx is defaulted to a media_unknown type.
         */
        sc->tulip_probe_media = tulip_srom_conninfo[sc->tulip_connidx].sc_media;
        if (sc->tulip_probe_media != TULIP_MEDIA_UNKNOWN) {
            tulip_linkup(sc, sc->tulip_probe_media);
            tulip_timeout(sc);
            return;
        }

        if (sc->tulip_features & TULIP_HAVE_GPR) {
            sc->tulip_probe_state = TULIP_PROBE_GPRTEST;
            sc->tulip_probe_timeout = 2000;
        } else {
            sc->tulip_probe_media = TULIP_MEDIA_MAX;
            sc->tulip_probe_timeout = 0;
            sc->tulip_probe_state = TULIP_PROBE_MEDIATEST;
        }
    }

    /*
     * Ignore txprobe failures or spurious callbacks.
     */
    if (event == TULIP_MEDIAPOLL_TXPROBE_FAILED
            && sc->tulip_probe_state != TULIP_PROBE_MEDIATEST) {
        sc->tulip_flags &= ~TULIP_TXPROBE_ACTIVE;
        return;
    }

    /*
     * If we really transmitted a packet, then that's the media we'll use.
     */
    if (event == TULIP_MEDIAPOLL_TXPROBE_OK || event == TULIP_MEDIAPOLL_LINKPASS) {
        if (event == TULIP_MEDIAPOLL_LINKPASS) {
            /* XXX Check media status just to be sure */
            sc->tulip_probe_media = TULIP_MEDIA_10BASET;
        }
        tulip_linkup(sc, sc->tulip_probe_media);
        tulip_timeout(sc);
        return;
    }

    if (sc->tulip_probe_state == TULIP_PROBE_GPRTEST) {
        /*
         * Brute force.  We cycle through each of the media types
         * and try to transmit a packet.
         */
        sc->tulip_probe_state = TULIP_PROBE_MEDIATEST;
        sc->tulip_probe_media = TULIP_MEDIA_MAX;
        sc->tulip_probe_timeout = 0;
        tulip_timeout(sc);
        return;
    }

    if (sc->tulip_probe_state != TULIP_PROBE_MEDIATEST
           && (sc->tulip_features & TULIP_HAVE_MII)) {
        tulip_media_t old_media = sc->tulip_probe_media;
        tulip_mii_autonegotiate(sc, sc->tulip_phyaddr);
        switch (sc->tulip_probe_state) {
            case TULIP_PROBE_FAILED:
            case TULIP_PROBE_MEDIATEST: {
                /*
                 * Try the next media.
                 */
                sc->tulip_probe_mediamask |= sc->tulip_mediums[sc->tulip_probe_media]->mi_mediamask;
                sc->tulip_probe_timeout = 0;
#ifdef notyet
                if (sc->tulip_probe_state == TULIP_PROBE_FAILED)
                    break;
                if (sc->tulip_probe_media != tulip_mii_phy_readspecific(sc))
                    break;
                sc->tulip_probe_timeout = TULIP_IS_MEDIA_TP(sc->tulip_probe_media) ? 2500 : 300;
#endif
                break;
            }
            case TULIP_PROBE_PHYAUTONEG: {
                return;
            }
            case TULIP_PROBE_INACTIVE: {
                /*
                 * Only probe if we autonegotiated a media that hasn't failed.
                 */
                sc->tulip_probe_timeout = 0;
                if (sc->tulip_probe_mediamask & TULIP_BIT(sc->tulip_probe_media)) {
                    sc->tulip_probe_media = old_media;
                    break;
                }
                tulip_linkup(sc, sc->tulip_probe_media);
                tulip_timeout(sc);
                return;
            }
            default: {
#if defined(DIAGNOSTIC)
                panic("tulip_media_poll: botch at line %d", __LINE__);
#endif
                break;
            }
        }
    }

    if (event == TULIP_MEDIAPOLL_TXPROBE_FAILED) {
        sc->tulip_flags &= ~TULIP_TXPROBE_ACTIVE;
        return;
    }

    /*
     * switch to another media if we tried this one enough.
     */
    if (/* event == TULIP_MEDIAPOLL_TXPROBE_FAILED || */ sc->tulip_probe_timeout <= 0) {
        /*
         * Find the next media type to check for.  Full Duplex
         * types are not allowed.
         */
        do {
            sc->tulip_probe_media -= 1;
            if (sc->tulip_probe_media == TULIP_MEDIA_UNKNOWN) {
                if (++sc->tulip_probe_passes == 3) {
                    if_printf(&sc->arpcom.ac_if,
                        "autosense failed: cable problem?\n");
                    if ((sc->arpcom.ac_if.if_flags & IFF_UP) == 0) {
                        sc->arpcom.ac_if.if_flags &= ~IFF_RUNNING;
                        sc->tulip_probe_state = TULIP_PROBE_INACTIVE;
                        return;
                    }
                }
                sc->tulip_flags ^= TULIP_TRYNWAY;       /* XXX */
                sc->tulip_probe_mediamask = 0;
                sc->tulip_probe_media = TULIP_MEDIA_MAX - 1;
            }
        } while (sc->tulip_mediums[sc->tulip_probe_media] == NULL
                 || (sc->tulip_probe_mediamask & TULIP_BIT(sc->tulip_probe_media))
                 || TULIP_IS_MEDIA_FD(sc->tulip_probe_media));

        sc->tulip_probe_timeout = TULIP_IS_MEDIA_TP(sc->tulip_probe_media) ? 2500 : 1000;
        sc->tulip_probe_state = TULIP_PROBE_MEDIATEST;
        sc->tulip_probe.probe_txprobes = 0;
        tulip_reset(sc);
        tulip_media_set(sc, sc->tulip_probe_media);
        sc->tulip_flags &= ~TULIP_TXPROBE_ACTIVE;
    }
    tulip_timeout(sc);

    /*
     * If this is hanging off a phy, we know are doing NWAY and we have
     * forced the phy to a specific speed.  Wait for link up before
     * before sending a packet.
     */
    switch (sc->tulip_mediums[sc->tulip_probe_media]->mi_type) {
        case TULIP_MEDIAINFO_MII: {
            if (sc->tulip_probe_media != tulip_mii_phy_readspecific(sc))
                return;
            break;
        }
        case TULIP_MEDIAINFO_SIA: {
            if (TULIP_IS_MEDIA_TP(sc->tulip_probe_media)) {
                if (TULIP_CSR_READ(sc, csr_sia_status) & TULIP_SIASTS_LINKFAIL)
                    return;
                tulip_linkup(sc, sc->tulip_probe_media);
#ifdef notyet
                if (sc->tulip_features & TULIP_HAVE_MII)
                    tulip_timeout(sc);
#endif
                return;
            }
            break;
        }
        case TULIP_MEDIAINFO_RESET:
        case TULIP_MEDIAINFO_SYM:
        case TULIP_MEDIAINFO_NONE:
        case TULIP_MEDIAINFO_GPR: {
            break;
        }
    }
    /*
     * Try to send a packet.
     */
    tulip_txprobe(sc);
}

static void
tulip_media_select(tulip_softc_t *sc)
{
    if (sc->tulip_features & TULIP_HAVE_GPR) {
        TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_PINSET|sc->tulip_gpinit);
        DELAY(10);
        TULIP_CSR_WRITE(sc, csr_gp, sc->tulip_gpdata);
    }
    /*
     * If this board has no media, just return
     */
    if (sc->tulip_features & TULIP_HAVE_NOMEDIA)
        return;

    if (sc->tulip_media == TULIP_MEDIA_UNKNOWN) {
        TULIP_CSR_WRITE(sc, csr_intr, sc->tulip_intrmask);
        (*sc->tulip_boardsw->bd_media_poll)(sc, TULIP_MEDIAPOLL_START);
    } else {
        tulip_media_set(sc, sc->tulip_media);
    }
}

static void
tulip_21040_mediainfo_init(tulip_softc_t *sc, tulip_media_t media)
{
    sc->tulip_cmdmode |= TULIP_CMD_CAPTREFFCT|TULIP_CMD_THRSHLD160
        |TULIP_CMD_BACKOFFCTR;
    sc->arpcom.ac_if.if_baudrate = 10000000;

    if (media == TULIP_MEDIA_10BASET || media == TULIP_MEDIA_UNKNOWN) {
        TULIP_MEDIAINFO_SIA_INIT(sc, &sc->tulip_mediainfo[0], 21040, 10BASET);
        TULIP_MEDIAINFO_SIA_INIT(sc, &sc->tulip_mediainfo[1], 21040, 10BASET_FD);
        sc->tulip_intrmask |= TULIP_STS_LINKPASS|TULIP_STS_LINKFAIL;
    }

    if (media == TULIP_MEDIA_AUIBNC || media == TULIP_MEDIA_UNKNOWN) {
        TULIP_MEDIAINFO_SIA_INIT(sc, &sc->tulip_mediainfo[2], 21040, AUIBNC);
    }

    if (media == TULIP_MEDIA_UNKNOWN) {
        TULIP_MEDIAINFO_SIA_INIT(sc, &sc->tulip_mediainfo[3], 21040, EXTSIA);
    }
}

static void
tulip_21040_media_probe(tulip_softc_t *sc)
{
    tulip_21040_mediainfo_init(sc, TULIP_MEDIA_UNKNOWN);
}

static void
tulip_21040_10baset_only_media_probe(tulip_softc_t *sc)
{
    tulip_21040_mediainfo_init(sc, TULIP_MEDIA_10BASET);
    tulip_media_set(sc, TULIP_MEDIA_10BASET);
    sc->tulip_media = TULIP_MEDIA_10BASET;
}

static void
tulip_21040_10baset_only_media_select(tulip_softc_t *sc)
{
    sc->tulip_flags |= TULIP_LINKUP;
    if (sc->tulip_media == TULIP_MEDIA_10BASET_FD) {
        sc->tulip_cmdmode |= TULIP_CMD_FULLDUPLEX;
        sc->tulip_flags &= ~TULIP_SQETEST;
    } else {
        sc->tulip_cmdmode &= ~TULIP_CMD_FULLDUPLEX;
        sc->tulip_flags |= TULIP_SQETEST;
    }
    tulip_media_set(sc, sc->tulip_media);
}

static void
tulip_21040_auibnc_only_media_probe(tulip_softc_t *sc)
{
    tulip_21040_mediainfo_init(sc, TULIP_MEDIA_AUIBNC);
    sc->tulip_flags |= TULIP_SQETEST|TULIP_LINKUP;
    tulip_media_set(sc, TULIP_MEDIA_AUIBNC);
    sc->tulip_media = TULIP_MEDIA_AUIBNC;
}

static void
tulip_21040_auibnc_only_media_select(tulip_softc_t *sc)
{
    tulip_media_set(sc, TULIP_MEDIA_AUIBNC);
    sc->tulip_cmdmode &= ~TULIP_CMD_FULLDUPLEX;
}

static const tulip_boardsw_t tulip_21040_boardsw = {
    TULIP_21040_GENERIC,
    tulip_21040_media_probe,
    tulip_media_select,
    tulip_media_poll,
};

static const tulip_boardsw_t tulip_21040_10baset_only_boardsw = {
    TULIP_21040_GENERIC,
    tulip_21040_10baset_only_media_probe,
    tulip_21040_10baset_only_media_select,
    NULL,
};

static const tulip_boardsw_t tulip_21040_auibnc_only_boardsw = {
    TULIP_21040_GENERIC,
    tulip_21040_auibnc_only_media_probe,
    tulip_21040_auibnc_only_media_select,
    NULL,
};

static void
tulip_21041_mediainfo_init(tulip_softc_t *sc)
{
    tulip_media_info_t *mi = sc->tulip_mediainfo;

#ifdef notyet
    if (sc->tulip_revinfo >= 0x20) {
        TULIP_MEDIAINFO_SIA_INIT(sc, &mi[0], 21041P2, 10BASET);
        TULIP_MEDIAINFO_SIA_INIT(sc, &mi[1], 21041P2, 10BASET_FD);
        TULIP_MEDIAINFO_SIA_INIT(sc, &mi[0], 21041P2, AUI);
        TULIP_MEDIAINFO_SIA_INIT(sc, &mi[1], 21041P2, BNC);
        return;
    }
#endif
    TULIP_MEDIAINFO_SIA_INIT(sc, &mi[0], 21041, 10BASET);
    TULIP_MEDIAINFO_SIA_INIT(sc, &mi[1], 21041, 10BASET_FD);
    TULIP_MEDIAINFO_SIA_INIT(sc, &mi[2], 21041, AUI);
    TULIP_MEDIAINFO_SIA_INIT(sc, &mi[3], 21041, BNC);
}

static void
tulip_21041_media_probe(tulip_softc_t *sc)
{
    sc->arpcom.ac_if.if_baudrate = 10000000;
    sc->tulip_cmdmode |= TULIP_CMD_CAPTREFFCT|TULIP_CMD_ENHCAPTEFFCT
        |TULIP_CMD_THRSHLD160|TULIP_CMD_BACKOFFCTR;
    sc->tulip_intrmask |= TULIP_STS_LINKPASS|TULIP_STS_LINKFAIL;
    tulip_21041_mediainfo_init(sc);
}

static void
tulip_21041_media_poll(tulip_softc_t *sc, tulip_mediapoll_event_t event)
{
    uint32_t sia_status;

    if (event == TULIP_MEDIAPOLL_LINKFAIL) {
        if (sc->tulip_probe_state != TULIP_PROBE_INACTIVE
                || !TULIP_DO_AUTOSENSE(sc))
            return;
        sc->tulip_media = TULIP_MEDIA_UNKNOWN;
        tulip_reset(sc);        /* start probe */
        return;
    }

    /*
     * If we've been been asked to start a poll or link change interrupt
     * restart the probe (and reset the tulip to a known state).
     */
    if (event == TULIP_MEDIAPOLL_START) {
        ifq_set_oactive(&sc->arpcom.ac_if.if_snd);
        sc->tulip_cmdmode &= ~(TULIP_CMD_FULLDUPLEX|TULIP_CMD_RXRUN);
#ifdef notyet
        if (sc->tulip_revinfo >= 0x20) {
            sc->tulip_cmdmode |= TULIP_CMD_FULLDUPLEX;
            sc->tulip_flags |= TULIP_DIDNWAY;
        }
#endif
        TULIP_CSR_WRITE(sc, csr_command, sc->tulip_cmdmode);
        sc->tulip_probe_state = TULIP_PROBE_MEDIATEST;
        sc->tulip_probe_media = TULIP_MEDIA_10BASET;
        sc->tulip_probe_timeout = TULIP_21041_PROBE_10BASET_TIMEOUT;
        tulip_media_set(sc, TULIP_MEDIA_10BASET);
        tulip_timeout(sc);
        return;
    }

    if (sc->tulip_probe_state == TULIP_PROBE_INACTIVE)
        return;

    if (event == TULIP_MEDIAPOLL_TXPROBE_OK) {
        tulip_linkup(sc, sc->tulip_probe_media);
        return;
    }

    sia_status = TULIP_CSR_READ(sc, csr_sia_status);
    TULIP_CSR_WRITE(sc, csr_sia_status, sia_status);
    if ((sia_status & TULIP_SIASTS_LINKFAIL) == 0) {
        if (sc->tulip_revinfo >= 0x20) {
            if (sia_status & (PHYSTS_10BASET_FD << (16 - 6)))
                sc->tulip_probe_media = TULIP_MEDIA_10BASET_FD;
        }
        /*
         * If the link has passed LinkPass, 10baseT is the
         * proper media to use.
         */
        tulip_linkup(sc, sc->tulip_probe_media);
        return;
    }

    /*
     * wait for up to 2.4 seconds for the link to reach pass state.
     * Only then start scanning the other media for activity.
     * choose media with receive activity over those without.
     */
    if (sc->tulip_probe_media == TULIP_MEDIA_10BASET) {
        if (event != TULIP_MEDIAPOLL_TIMER)
            return;
        if (sc->tulip_probe_timeout > 0
                && (sia_status & TULIP_SIASTS_OTHERRXACTIVITY) == 0) {
            tulip_timeout(sc);
            return;
        }
        sc->tulip_probe_timeout = TULIP_21041_PROBE_AUIBNC_TIMEOUT;
        sc->tulip_flags |= TULIP_WANTRXACT;
        if (sia_status & TULIP_SIASTS_OTHERRXACTIVITY) {
            sc->tulip_probe_media = TULIP_MEDIA_BNC;
        } else {
            sc->tulip_probe_media = TULIP_MEDIA_AUI;
        }
        tulip_media_set(sc, sc->tulip_probe_media);
        tulip_timeout(sc);
        return;
    }

    /*
     * If we failed, clear the txprobe active flag.
     */
    if (event == TULIP_MEDIAPOLL_TXPROBE_FAILED)
        sc->tulip_flags &= ~TULIP_TXPROBE_ACTIVE;


    if (event == TULIP_MEDIAPOLL_TIMER) {
        /*
         * If we've received something, then that's our link!
         */
        if (sc->tulip_flags & TULIP_RXACT) {
            tulip_linkup(sc, sc->tulip_probe_media);
            return;
        }
        /*
         * if no txprobe active  
         */
        if ((sc->tulip_flags & TULIP_TXPROBE_ACTIVE) == 0
                && ((sc->tulip_flags & TULIP_WANTRXACT) == 0
                    || (sia_status & TULIP_SIASTS_RXACTIVITY))) {
            sc->tulip_probe_timeout = TULIP_21041_PROBE_AUIBNC_TIMEOUT;
            tulip_txprobe(sc);
            tulip_timeout(sc);
            return;
        }
        /*
         * Take 2 passes through before deciding to not
         * wait for receive activity.  Then take another
         * two passes before spitting out a warning.
         */
        if (sc->tulip_probe_timeout <= 0) {
            if (sc->tulip_flags & TULIP_WANTRXACT) {
                sc->tulip_flags &= ~TULIP_WANTRXACT;
                sc->tulip_probe_timeout = TULIP_21041_PROBE_AUIBNC_TIMEOUT;
            } else {
                if_printf(&sc->arpcom.ac_if,
                    "autosense failed: cable problem?\n");
                if ((sc->arpcom.ac_if.if_flags & IFF_UP) == 0) {
                    sc->arpcom.ac_if.if_flags &= ~IFF_RUNNING;
                    sc->tulip_probe_state = TULIP_PROBE_INACTIVE;
                    return;
                }
            }
        }
    }
    
    /*
     * Since this media failed to probe, try the other one.
     */
    sc->tulip_probe_timeout = TULIP_21041_PROBE_AUIBNC_TIMEOUT;
    if (sc->tulip_probe_media == TULIP_MEDIA_AUI) {
        sc->tulip_probe_media = TULIP_MEDIA_BNC;
    } else {
        sc->tulip_probe_media = TULIP_MEDIA_AUI;
    }
    tulip_media_set(sc, sc->tulip_probe_media);
    sc->tulip_flags &= ~TULIP_TXPROBE_ACTIVE;
    tulip_timeout(sc);
}

static const tulip_boardsw_t tulip_21041_boardsw = {
    TULIP_21041_GENERIC,
    tulip_21041_media_probe,
    tulip_media_select,
    tulip_21041_media_poll
};

static const tulip_phy_attr_t tulip_mii_phy_attrlist[] = {
    { 0x20005c00, 0,            /* 08-00-17 */
      {
        { 0x19, 0x0040, 0x0040 },       /* 10TX */
        { 0x19, 0x0040, 0x0000 },       /* 100TX */
      },
    },
    { 0x0281F400, 0,            /* 00-A0-7D */
      {
        { 0x12, 0x0010, 0x0000 },       /* 10T */
        { },                            /* 100TX */
        { 0x12, 0x0010, 0x0010 },       /* 100T4 */
        { 0x12, 0x0008, 0x0008 },       /* FULL_DUPLEX */
      },
    },
#if 0
    { 0x0015F420, 0,    /* 00-A0-7D */
      {
        { 0x12, 0x0010, 0x0000 },       /* 10T */
        { },                            /* 100TX */
        { 0x12, 0x0010, 0x0010 },       /* 100T4 */
        { 0x12, 0x0008, 0x0008 },       /* FULL_DUPLEX */
      },
    },
#endif
    { 0x0281F400, 0,            /* 00-A0-BE */
      {
        { 0x11, 0x8000, 0x0000 },       /* 10T */
        { 0x11, 0x8000, 0x8000 },       /* 100TX */
        { },                            /* 100T4 */
        { 0x11, 0x4000, 0x4000 },       /* FULL_DUPLEX */
      },
    },
    { 0 }
};

static tulip_media_t
tulip_mii_phy_readspecific(tulip_softc_t *sc)
{
    const tulip_phy_attr_t *attr;
    u_int16_t data;
    u_int32_t id;
    unsigned idx = 0;
    static const tulip_media_t table[] = {
        TULIP_MEDIA_UNKNOWN,
        TULIP_MEDIA_10BASET,
        TULIP_MEDIA_100BASETX,
        TULIP_MEDIA_100BASET4,
        TULIP_MEDIA_UNKNOWN,
        TULIP_MEDIA_10BASET_FD,
        TULIP_MEDIA_100BASETX_FD,
        TULIP_MEDIA_UNKNOWN
    };

    /*
     * Don't read phy specific registers if link is not up.
     */
    data = tulip_mii_readreg(sc, sc->tulip_phyaddr, PHYREG_STATUS);
    if ((data & (PHYSTS_LINK_UP|PHYSTS_EXTENDED_REGS)) != (PHYSTS_LINK_UP|PHYSTS_EXTENDED_REGS))
        return TULIP_MEDIA_UNKNOWN;

    id = (tulip_mii_readreg(sc, sc->tulip_phyaddr, PHYREG_IDLOW) << 16) |
        tulip_mii_readreg(sc, sc->tulip_phyaddr, PHYREG_IDHIGH);
    for (attr = tulip_mii_phy_attrlist;; attr++) {
        if (attr->attr_id == 0)
            return TULIP_MEDIA_UNKNOWN;
        if ((id & ~0x0F) == attr->attr_id)
            break;
    }

    if (attr->attr_modes[PHY_MODE_100TX].pm_regno) {
        const tulip_phy_modedata_t *pm = &attr->attr_modes[PHY_MODE_100TX];
        data = tulip_mii_readreg(sc, sc->tulip_phyaddr, pm->pm_regno);
        if ((data & pm->pm_mask) == pm->pm_value)
            idx = 2;
    }
    if (idx == 0 && attr->attr_modes[PHY_MODE_100T4].pm_regno) {
        const tulip_phy_modedata_t *pm = &attr->attr_modes[PHY_MODE_100T4];
        data = tulip_mii_readreg(sc, sc->tulip_phyaddr, pm->pm_regno);
        if ((data & pm->pm_mask) == pm->pm_value)
            idx = 3;
    }
    if (idx == 0 && attr->attr_modes[PHY_MODE_10T].pm_regno) {
        const tulip_phy_modedata_t *pm = &attr->attr_modes[PHY_MODE_10T];
        data = tulip_mii_readreg(sc, sc->tulip_phyaddr, pm->pm_regno);
        if ((data & pm->pm_mask) == pm->pm_value)
            idx = 1;
    } 
    if (idx != 0 && attr->attr_modes[PHY_MODE_FULLDUPLEX].pm_regno) {
        const tulip_phy_modedata_t *pm = &attr->attr_modes[PHY_MODE_FULLDUPLEX];
        data = tulip_mii_readreg(sc, sc->tulip_phyaddr, pm->pm_regno);
        idx += ((data & pm->pm_mask) == pm->pm_value ? 4 : 0);
    }
    return table[idx];
}

static u_int
tulip_mii_get_phyaddr(tulip_softc_t *sc, u_int offset)
{
    u_int phyaddr;

    for (phyaddr = 1; phyaddr < 32; phyaddr++) {
        u_int status = tulip_mii_readreg(sc, phyaddr, PHYREG_STATUS);
        if (status == 0 || status == 0xFFFF || status < PHYSTS_10BASET)
            continue;
        if (offset == 0)
            return phyaddr;
        offset--;
    }
    if (offset == 0) {
        u_int status = tulip_mii_readreg(sc, 0, PHYREG_STATUS);
        if (status == 0 || status == 0xFFFF || status < PHYSTS_10BASET)
            return TULIP_MII_NOPHY;
        return 0;
    }
    return TULIP_MII_NOPHY;
}

static int
tulip_mii_map_abilities(tulip_softc_t *sc, u_int abilities)
{
    sc->tulip_abilities = abilities;
    if (abilities & PHYSTS_100BASETX_FD) {
        sc->tulip_probe_media = TULIP_MEDIA_100BASETX_FD;
    } else if (abilities & PHYSTS_100BASET4) {
        sc->tulip_probe_media = TULIP_MEDIA_100BASET4;
    } else if (abilities & PHYSTS_100BASETX) {
        sc->tulip_probe_media = TULIP_MEDIA_100BASETX;
    } else if (abilities & PHYSTS_10BASET_FD) {
        sc->tulip_probe_media = TULIP_MEDIA_10BASET_FD;
    } else if (abilities & PHYSTS_10BASET) {
        sc->tulip_probe_media = TULIP_MEDIA_10BASET;
    } else {
        sc->tulip_probe_state = TULIP_PROBE_MEDIATEST;
        return 0;
    }
    sc->tulip_probe_state = TULIP_PROBE_INACTIVE;
    return 1;
}

static void
tulip_mii_autonegotiate(tulip_softc_t *sc, u_int phyaddr)
{
    switch (sc->tulip_probe_state) {
        case TULIP_PROBE_MEDIATEST:
        case TULIP_PROBE_INACTIVE: {
            sc->tulip_flags |= TULIP_DIDNWAY;
            tulip_mii_writereg(sc, phyaddr, PHYREG_CONTROL, PHYCTL_RESET);
            sc->tulip_probe_timeout = 3000;
            sc->tulip_intrmask |= TULIP_STS_ABNRMLINTR|TULIP_STS_NORMALINTR;
            sc->tulip_probe_state = TULIP_PROBE_PHYRESET;
            /* FALL THROUGH */
        }
        case TULIP_PROBE_PHYRESET: {
            uint32_t status;
            uint32_t data = tulip_mii_readreg(sc, phyaddr, PHYREG_CONTROL);
            if (data & PHYCTL_RESET) {
                if (sc->tulip_probe_timeout > 0) {
                    tulip_timeout(sc);
                    return;
                }
                if_printf(&sc->arpcom.ac_if,
                    "(phy%d): error: reset of PHY never completed!\n", phyaddr);
                sc->tulip_flags &= ~TULIP_TXPROBE_ACTIVE;
                sc->tulip_probe_state = TULIP_PROBE_FAILED;
                sc->arpcom.ac_if.if_flags &= ~(IFF_UP|IFF_RUNNING);
                return;
            }
            status = tulip_mii_readreg(sc, phyaddr, PHYREG_STATUS);
            if ((status & PHYSTS_CAN_AUTONEG) == 0) {
                sc->tulip_flags &= ~TULIP_DIDNWAY;
                sc->tulip_probe_state = TULIP_PROBE_MEDIATEST;
                return;
            }
            if (tulip_mii_readreg(sc, phyaddr, PHYREG_AUTONEG_ADVERTISEMENT) != ((status >> 6) | 0x01))
                tulip_mii_writereg(sc, phyaddr, PHYREG_AUTONEG_ADVERTISEMENT, (status >> 6) | 0x01);
            tulip_mii_writereg(sc, phyaddr, PHYREG_CONTROL, data|PHYCTL_AUTONEG_RESTART|PHYCTL_AUTONEG_ENABLE);
            data = tulip_mii_readreg(sc, phyaddr, PHYREG_CONTROL);
            sc->tulip_probe_state = TULIP_PROBE_PHYAUTONEG;
            sc->tulip_probe_timeout = 3000;
            /* FALL THROUGH */
        }
        case TULIP_PROBE_PHYAUTONEG: {
            u_int32_t status = tulip_mii_readreg(sc, phyaddr, PHYREG_STATUS);
            u_int32_t data;
            if ((status & PHYSTS_AUTONEG_DONE) == 0) {
                if (sc->tulip_probe_timeout > 0) {
                    tulip_timeout(sc);
                    return;
                }
                sc->tulip_flags &= ~TULIP_DIDNWAY;
                sc->tulip_probe_state = TULIP_PROBE_MEDIATEST;
                return;
            }
            data = tulip_mii_readreg(sc, phyaddr, PHYREG_AUTONEG_ABILITIES);
            data = (data << 6) & status;
            if (!tulip_mii_map_abilities(sc, data))
                sc->tulip_flags &= ~TULIP_DIDNWAY;
            return;
        }
        default: {
#if defined(DIAGNOSTIC)
            panic("tulip_media_poll: botch at line %d", __LINE__);
#endif
            break;
        }
    }
}

static void
tulip_2114x_media_preset(tulip_softc_t *sc)
{
    const tulip_media_info_t *mi = NULL;
    tulip_media_t media;

    if (sc->tulip_probe_state == TULIP_PROBE_INACTIVE)
        media = sc->tulip_media;
    else
        media = sc->tulip_probe_media;
    
    sc->tulip_cmdmode &= ~TULIP_CMD_PORTSELECT;
    sc->tulip_flags &= ~TULIP_SQETEST;
    if (media != TULIP_MEDIA_UNKNOWN && media != TULIP_MEDIA_MAX) {
            mi = sc->tulip_mediums[media];
            if (mi->mi_type == TULIP_MEDIAINFO_MII) {
                sc->tulip_cmdmode |= TULIP_CMD_PORTSELECT;
            } else if (mi->mi_type == TULIP_MEDIAINFO_GPR
                       || mi->mi_type == TULIP_MEDIAINFO_SYM) {
                sc->tulip_cmdmode &= ~TULIP_GPR_CMDBITS;
                sc->tulip_cmdmode |= mi->mi_cmdmode;
            } else if (mi->mi_type == TULIP_MEDIAINFO_SIA) {
                TULIP_CSR_WRITE(sc, csr_sia_connectivity, TULIP_SIACONN_RESET);
            }
    }
    switch (media) {
        case TULIP_MEDIA_BNC:
        case TULIP_MEDIA_AUI:
        case TULIP_MEDIA_10BASET: {
            sc->tulip_cmdmode &= ~TULIP_CMD_FULLDUPLEX;
            sc->tulip_cmdmode |= TULIP_CMD_TXTHRSHLDCTL;
            sc->arpcom.ac_if.if_baudrate = 10000000;
            sc->tulip_flags |= TULIP_SQETEST;
            break;
        }
        case TULIP_MEDIA_10BASET_FD: {
            sc->tulip_cmdmode |= TULIP_CMD_FULLDUPLEX|TULIP_CMD_TXTHRSHLDCTL;
            sc->arpcom.ac_if.if_baudrate = 10000000;
            break;
        }
        case TULIP_MEDIA_100BASEFX:
        case TULIP_MEDIA_100BASET4:
        case TULIP_MEDIA_100BASETX: {
            sc->tulip_cmdmode &= ~(TULIP_CMD_FULLDUPLEX|TULIP_CMD_TXTHRSHLDCTL);
            sc->tulip_cmdmode |= TULIP_CMD_PORTSELECT;
            sc->arpcom.ac_if.if_baudrate = 100000000;
            break;
        }
        case TULIP_MEDIA_100BASEFX_FD:
        case TULIP_MEDIA_100BASETX_FD: {
            sc->tulip_cmdmode |= TULIP_CMD_FULLDUPLEX|TULIP_CMD_PORTSELECT;
            sc->tulip_cmdmode &= ~TULIP_CMD_TXTHRSHLDCTL;
            sc->arpcom.ac_if.if_baudrate = 100000000;
            break;
        }
        default: {
            break;
        }
    }
    TULIP_CSR_WRITE(sc, csr_command, sc->tulip_cmdmode);
}

/*
 ********************************************************************
 *  Start of 21140/21140A support which does not use the MII interface 
 */

static void
tulip_null_media_poll(tulip_softc_t *sc, tulip_mediapoll_event_t event)
{
#if defined(DIAGNOSTIC)
    if_printf(&sc->arpcom.ac_if, "botch(media_poll) at line %d\n", __LINE__);
#endif
}

static void
tulip_21140_mediainit(tulip_softc_t *sc, tulip_media_info_t *mip,
                      tulip_media_t media, u_int gpdata, u_int cmdmode)
{
    sc->tulip_mediums[media] = mip;
    mip->mi_type = TULIP_MEDIAINFO_GPR;
    mip->mi_cmdmode = cmdmode;
    mip->mi_gpdata = gpdata;
}

static void
tulip_21140_evalboard_media_probe(tulip_softc_t *sc)
{
    tulip_media_info_t *mip = sc->tulip_mediainfo;

    sc->tulip_gpinit = TULIP_GP_EB_PINS;
    sc->tulip_gpdata = TULIP_GP_EB_INIT;
    TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_EB_PINS);
    TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_EB_INIT);
    TULIP_CSR_WRITE(sc, csr_command,
        TULIP_CSR_READ(sc, csr_command) | TULIP_CMD_PORTSELECT |
        TULIP_CMD_PCSFUNCTION | TULIP_CMD_SCRAMBLER | TULIP_CMD_MUSTBEONE);
    TULIP_CSR_WRITE(sc, csr_command,
        TULIP_CSR_READ(sc, csr_command) & ~TULIP_CMD_TXTHRSHLDCTL);
    DELAY(1000000);
    if ((TULIP_CSR_READ(sc, csr_gp) & TULIP_GP_EB_OK100) != 0) {
        sc->tulip_media = TULIP_MEDIA_10BASET;
    } else {
        sc->tulip_media = TULIP_MEDIA_100BASETX;
    }
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_10BASET,
                          TULIP_GP_EB_INIT,
                          TULIP_CMD_TXTHRSHLDCTL);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_10BASET_FD,
                          TULIP_GP_EB_INIT,
                          TULIP_CMD_TXTHRSHLDCTL|TULIP_CMD_FULLDUPLEX);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_100BASETX,
                          TULIP_GP_EB_INIT,
                          TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION
                              |TULIP_CMD_SCRAMBLER);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_100BASETX_FD,
                          TULIP_GP_EB_INIT,
                          TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION
                              |TULIP_CMD_SCRAMBLER|TULIP_CMD_FULLDUPLEX);
}

static const tulip_boardsw_t tulip_21140_eb_boardsw = {
    TULIP_21140_DEC_EB,
    tulip_21140_evalboard_media_probe,
    tulip_media_select,
    tulip_null_media_poll,
    tulip_2114x_media_preset,
};

static void
tulip_21140_accton_media_probe(tulip_softc_t *sc)
{
    tulip_media_info_t *mip = sc->tulip_mediainfo;
    u_int gpdata;

    sc->tulip_gpinit = TULIP_GP_EB_PINS;
    sc->tulip_gpdata = TULIP_GP_EB_INIT;
    TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_EB_PINS);
    TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_EB_INIT);
    TULIP_CSR_WRITE(sc, csr_command,
        TULIP_CSR_READ(sc, csr_command) | TULIP_CMD_PORTSELECT |
        TULIP_CMD_PCSFUNCTION | TULIP_CMD_SCRAMBLER | TULIP_CMD_MUSTBEONE);
    TULIP_CSR_WRITE(sc, csr_command,
        TULIP_CSR_READ(sc, csr_command) & ~TULIP_CMD_TXTHRSHLDCTL);
    DELAY(1000000);
    gpdata = TULIP_CSR_READ(sc, csr_gp);
    if ((gpdata & TULIP_GP_EN1207_UTP_INIT) == 0) {
        sc->tulip_media = TULIP_MEDIA_10BASET;
    } else {
        if ((gpdata & TULIP_GP_EN1207_BNC_INIT) == 0) {
                sc->tulip_media = TULIP_MEDIA_BNC;
        } else {
                sc->tulip_media = TULIP_MEDIA_100BASETX;
        }
    }
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_BNC,
                          TULIP_GP_EN1207_BNC_INIT,
                          TULIP_CMD_TXTHRSHLDCTL);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_10BASET,
                          TULIP_GP_EN1207_UTP_INIT,
                          TULIP_CMD_TXTHRSHLDCTL);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_10BASET_FD,
                          TULIP_GP_EN1207_UTP_INIT,
                          TULIP_CMD_TXTHRSHLDCTL|TULIP_CMD_FULLDUPLEX);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_100BASETX,
                          TULIP_GP_EN1207_100_INIT,
                          TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION
                              |TULIP_CMD_SCRAMBLER);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_100BASETX_FD,
                          TULIP_GP_EN1207_100_INIT,
                          TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION
                              |TULIP_CMD_SCRAMBLER|TULIP_CMD_FULLDUPLEX);
}

static const tulip_boardsw_t tulip_21140_accton_boardsw = {
    TULIP_21140_EN1207,
    tulip_21140_accton_media_probe,
    tulip_media_select,
    tulip_null_media_poll,
    tulip_2114x_media_preset,
};

static void
tulip_21140_smc9332_media_probe(tulip_softc_t *sc)
{
    tulip_media_info_t *mip = sc->tulip_mediainfo;
    int idx, cnt = 0;

    TULIP_CSR_WRITE(sc, csr_command, TULIP_CMD_PORTSELECT|TULIP_CMD_MUSTBEONE);
    TULIP_CSR_WRITE(sc, csr_busmode, TULIP_BUSMODE_SWRESET);
    DELAY(10);  /* Wait 10 microseconds (actually 50 PCI cycles but at 
                   33MHz that comes to two microseconds but wait a
                   bit longer anyways) */
    TULIP_CSR_WRITE(sc, csr_command, TULIP_CMD_PORTSELECT |
        TULIP_CMD_PCSFUNCTION | TULIP_CMD_SCRAMBLER | TULIP_CMD_MUSTBEONE);
    sc->tulip_gpinit = TULIP_GP_SMC_9332_PINS;
    sc->tulip_gpdata = TULIP_GP_SMC_9332_INIT;
    TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_SMC_9332_PINS|TULIP_GP_PINSET);
    TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_SMC_9332_INIT);
    DELAY(200000);
    for (idx = 1000; idx > 0; idx--) {
        u_int32_t csr = TULIP_CSR_READ(sc, csr_gp);
        if ((csr & (TULIP_GP_SMC_9332_OK10|TULIP_GP_SMC_9332_OK100)) == (TULIP_GP_SMC_9332_OK10|TULIP_GP_SMC_9332_OK100)) {
            if (++cnt > 100)
                break;
        } else if ((csr & TULIP_GP_SMC_9332_OK10) == 0) {
            break;
        } else {
            cnt = 0;
        }
        DELAY(1000);
    }
    sc->tulip_media = cnt > 100 ? TULIP_MEDIA_100BASETX : TULIP_MEDIA_10BASET;
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_100BASETX,
                          TULIP_GP_SMC_9332_INIT,
                          TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION
                              |TULIP_CMD_SCRAMBLER);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_100BASETX_FD,
                          TULIP_GP_SMC_9332_INIT,
                          TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION
                              |TULIP_CMD_SCRAMBLER|TULIP_CMD_FULLDUPLEX);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_10BASET,
                          TULIP_GP_SMC_9332_INIT,
                          TULIP_CMD_TXTHRSHLDCTL);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_10BASET_FD,
                          TULIP_GP_SMC_9332_INIT,
                          TULIP_CMD_TXTHRSHLDCTL|TULIP_CMD_FULLDUPLEX);
}
 
static const tulip_boardsw_t tulip_21140_smc9332_boardsw = {
    TULIP_21140_SMC_9332,
    tulip_21140_smc9332_media_probe,
    tulip_media_select,
    tulip_null_media_poll,
    tulip_2114x_media_preset,
};

static void
tulip_21140_cogent_em100_media_probe(tulip_softc_t *sc)
{
    tulip_media_info_t *mip = sc->tulip_mediainfo;
    uint32_t cmdmode;

    sc->tulip_gpinit = TULIP_GP_EM100_PINS;
    sc->tulip_gpdata = TULIP_GP_EM100_INIT;
    TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_EM100_PINS);
    TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_EM100_INIT);

    cmdmode = TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION|TULIP_CMD_MUSTBEONE;
    cmdmode &= ~(TULIP_CMD_TXTHRSHLDCTL|TULIP_CMD_SCRAMBLER);
    if (sc->tulip_rombuf[32] == TULIP_COGENT_EM100FX_ID) {
        TULIP_CSR_WRITE(sc, csr_command, cmdmode);
        sc->tulip_media = TULIP_MEDIA_100BASEFX;

        tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_100BASEFX,
                          TULIP_GP_EM100_INIT,
                          TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION);
        tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_100BASEFX_FD,
                          TULIP_GP_EM100_INIT,
                          TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION
                              |TULIP_CMD_FULLDUPLEX);
    } else {
        TULIP_CSR_WRITE(sc, csr_command, cmdmode|TULIP_CMD_SCRAMBLER);
        sc->tulip_media = TULIP_MEDIA_100BASETX;
        tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_100BASETX,
                          TULIP_GP_EM100_INIT,
                          TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION
                              |TULIP_CMD_SCRAMBLER);
        tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_100BASETX_FD,
                          TULIP_GP_EM100_INIT,
                          TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION
                              |TULIP_CMD_SCRAMBLER|TULIP_CMD_FULLDUPLEX);
    }
}

static const tulip_boardsw_t tulip_21140_cogent_em100_boardsw = {
    TULIP_21140_COGENT_EM100,
    tulip_21140_cogent_em100_media_probe,
    tulip_media_select,
    tulip_null_media_poll,
    tulip_2114x_media_preset
};

static void
tulip_21140_znyx_zx34x_media_probe(tulip_softc_t *sc)
{
    tulip_media_info_t *mip = sc->tulip_mediainfo;
    int cnt10 = 0, cnt100 = 0, idx;

    sc->tulip_gpinit = TULIP_GP_ZX34X_PINS;
    sc->tulip_gpdata = TULIP_GP_ZX34X_INIT;
    TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_ZX34X_PINS);
    TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_ZX34X_INIT);
    TULIP_CSR_WRITE(sc, csr_command,
        TULIP_CSR_READ(sc, csr_command) | TULIP_CMD_PORTSELECT |
        TULIP_CMD_PCSFUNCTION | TULIP_CMD_SCRAMBLER | TULIP_CMD_MUSTBEONE);
    TULIP_CSR_WRITE(sc, csr_command,
        TULIP_CSR_READ(sc, csr_command) & ~TULIP_CMD_TXTHRSHLDCTL);

    DELAY(200000);
    for (idx = 1000; idx > 0; idx--) {
        uint32_t csr = TULIP_CSR_READ(sc, csr_gp);
        if ((csr & (TULIP_GP_ZX34X_LNKFAIL|TULIP_GP_ZX34X_SYMDET|TULIP_GP_ZX34X_SIGDET)) == (TULIP_GP_ZX34X_LNKFAIL|TULIP_GP_ZX34X_SYMDET|TULIP_GP_ZX34X_SIGDET)) {
            if (++cnt100 > 100)
                break;
        } else if ((csr & TULIP_GP_ZX34X_LNKFAIL) == 0) {
            if (++cnt10 > 100)
                break;
        } else {
            cnt10 = 0;
            cnt100 = 0;
        }
        DELAY(1000);
    }
    sc->tulip_media = cnt100 > 100 ? TULIP_MEDIA_100BASETX : TULIP_MEDIA_10BASET;
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_10BASET,
                          TULIP_GP_ZX34X_INIT,
                          TULIP_CMD_TXTHRSHLDCTL);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_10BASET_FD,
                          TULIP_GP_ZX34X_INIT,
                          TULIP_CMD_TXTHRSHLDCTL|TULIP_CMD_FULLDUPLEX);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_100BASETX,
                          TULIP_GP_ZX34X_INIT,
                          TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION
                              |TULIP_CMD_SCRAMBLER);
    tulip_21140_mediainit(sc, mip++, TULIP_MEDIA_100BASETX_FD,
                          TULIP_GP_ZX34X_INIT,
                          TULIP_CMD_PORTSELECT|TULIP_CMD_PCSFUNCTION
                              |TULIP_CMD_SCRAMBLER|TULIP_CMD_FULLDUPLEX);
}

static const tulip_boardsw_t tulip_21140_znyx_zx34x_boardsw = {
    TULIP_21140_ZNYX_ZX34X,
    tulip_21140_znyx_zx34x_media_probe,
    tulip_media_select,
    tulip_null_media_poll,
    tulip_2114x_media_preset,
};

static void
tulip_2114x_media_probe(tulip_softc_t *sc)
{
    sc->tulip_cmdmode |= TULIP_CMD_MUSTBEONE | TULIP_CMD_BACKOFFCTR | 
        TULIP_CMD_THRSHLD72;
}

static const tulip_boardsw_t tulip_2114x_isv_boardsw = {
    TULIP_21140_ISV,
    tulip_2114x_media_probe,
    tulip_media_select,
    tulip_media_poll,
    tulip_2114x_media_preset,
};

/*
 * ******** END of chip-specific handlers. ***********
 */

/*
 * Code the read the SROM and MII bit streams (I2C)
 */
#define EMIT    do {                                    \
        TULIP_CSR_WRITE(sc, csr_srom_mii, csr); \
        DELAY(1);                                       \
} while (0)

static void
tulip_srom_idle(tulip_softc_t *sc)
{
    u_int bit, csr;
    
    csr  = SROMSEL ; EMIT;
    csr  = SROMSEL | SROMRD; EMIT;  
    csr ^= SROMCS; EMIT;
    csr ^= SROMCLKON; EMIT;

    /*
     * Write 25 cycles of 0 which will force the SROM to be idle.
     */
    for (bit = 3 + SROM_BITWIDTH + 16; bit > 0; bit--) {
        csr ^= SROMCLKOFF; EMIT;    /* clock low; data not valid */
        csr ^= SROMCLKON; EMIT;     /* clock high; data valid */
    }
    csr ^= SROMCLKOFF; EMIT;
    csr ^= SROMCS; EMIT;
    csr  = 0; EMIT;
}

static void
tulip_srom_read(tulip_softc_t *sc)
{   
    const u_int bitwidth = SROM_BITWIDTH;
    const u_int cmdmask = (SROMCMD_RD << bitwidth);
    const u_int msb = 1 << (bitwidth + 3 - 1);
    u_int idx, lastidx = (1 << bitwidth) - 1;

    tulip_srom_idle(sc);

    for (idx = 0; idx <= lastidx; idx++) {
        u_int lastbit, data, bits, bit, csr;
        csr  = SROMSEL ;                EMIT;
        csr  = SROMSEL | SROMRD;        EMIT;
        csr ^= SROMCSON;                EMIT;
        csr ^=            SROMCLKON;    EMIT;
    
        lastbit = 0;
        for (bits = idx|cmdmask, bit = bitwidth + 3; bit > 0; bit--, bits <<= 1) {
            u_int thisbit = bits & msb;
            csr ^= SROMCLKOFF; EMIT;    /* clock low; data not valid */
            if (thisbit != lastbit) {
                csr ^= SROMDOUT; EMIT;  /* clock low; invert data */
            } else {
                EMIT;
            }
            csr ^= SROMCLKON; EMIT;     /* clock high; data valid */
            lastbit = thisbit;
        }
        csr ^= SROMCLKOFF; EMIT;

        for (data = 0, bits = 0; bits < 16; bits++) {
            data <<= 1;
            csr ^= SROMCLKON; EMIT;     /* clock high; data valid */ 
            data |= TULIP_CSR_READ(sc, csr_srom_mii) & SROMDIN ? 1 : 0;
            csr ^= SROMCLKOFF; EMIT;    /* clock low; data not valid */
        }
        sc->tulip_rombuf[idx*2] = data & 0xFF;
        sc->tulip_rombuf[idx*2+1] = data >> 8;
        csr  = SROMSEL | SROMRD; EMIT;
        csr  = 0; EMIT;
    }
    tulip_srom_idle(sc);
}

#define MII_EMIT    do {                                \
        TULIP_CSR_WRITE(sc, csr_srom_mii, csr);         \
        DELAY(1);                                       \
} while (0)

static void
tulip_mii_writebits(tulip_softc_t *sc, u_int data, u_int bits)
{
    u_int csr, msb, lastbit;

    msb = 1 << (bits - 1);
    csr = TULIP_CSR_READ(sc, csr_srom_mii) & (MII_RD|MII_DOUT|MII_CLK);
    lastbit = (csr & MII_DOUT) ? msb : 0;
    csr |= MII_WR; MII_EMIT;            /* clock low; assert write */

    for (; bits > 0; bits--, data <<= 1) {
        const unsigned thisbit = data & msb;
        if (thisbit != lastbit) {
            csr ^= MII_DOUT; MII_EMIT;  /* clock low; invert data */
        }
        csr ^= MII_CLKON; MII_EMIT;     /* clock high; data valid */
        lastbit = thisbit;
        csr ^= MII_CLKOFF; MII_EMIT;    /* clock low; data not valid */
    }
}

static void
tulip_mii_turnaround(tulip_softc_t *sc, u_int cmd)
{
    u_int csr;

    csr = TULIP_CSR_READ(sc, csr_srom_mii) & (MII_RD|MII_DOUT|MII_CLK);

    if (cmd == MII_WRCMD) {
        csr |= MII_DOUT; MII_EMIT;      /* clock low; change data */
        csr ^= MII_CLKON; MII_EMIT;     /* clock high; data valid */
        csr ^= MII_CLKOFF; MII_EMIT;    /* clock low; data not valid */
        csr ^= MII_DOUT; MII_EMIT;      /* clock low; change data */
    } else {
        csr |= MII_RD; MII_EMIT;        /* clock low; switch to read */
    }
    csr ^= MII_CLKON; MII_EMIT;         /* clock high; data valid */
    csr ^= MII_CLKOFF; MII_EMIT;        /* clock low; data not valid */
}

static u_int
tulip_mii_readbits(tulip_softc_t *sc)
{
    u_int csr, data, idx;

    csr = TULIP_CSR_READ(sc, csr_srom_mii) & (MII_RD|MII_DOUT|MII_CLK);

    for (idx = 0, data = 0; idx < 16; idx++) {
        data <<= 1;     /* this is NOOP on the first pass through */
        csr ^= MII_CLKON; MII_EMIT;     /* clock high; data valid */
        if (TULIP_CSR_READ(sc, csr_srom_mii) & MII_DIN)
            data |= 1;
        csr ^= MII_CLKOFF; MII_EMIT;    /* clock low; data not valid */
    }
    csr ^= MII_RD; MII_EMIT;            /* clock low; turn off read */

    return data;
}

static u_int
tulip_mii_readreg(tulip_softc_t *sc, u_int devaddr, u_int regno)
{
    u_int csr;
    u_int data;

    csr = TULIP_CSR_READ(sc, csr_srom_mii) & (MII_RD|MII_DOUT|MII_CLK);
    csr &= ~(MII_RD|MII_CLK); MII_EMIT;
    tulip_mii_writebits(sc, MII_PREAMBLE, 32);
    tulip_mii_writebits(sc, MII_RDCMD, 8);
    tulip_mii_writebits(sc, devaddr, 5);
    tulip_mii_writebits(sc, regno, 5);
    tulip_mii_turnaround(sc, MII_RDCMD);

    data = tulip_mii_readbits(sc);
    return data;
}

static void
tulip_mii_writereg(tulip_softc_t *sc, u_int devaddr, u_int regno, u_int data)
{
    u_int csr;

    csr = TULIP_CSR_READ(sc, csr_srom_mii) & (MII_RD|MII_DOUT|MII_CLK);
    csr &= ~(MII_RD|MII_CLK); MII_EMIT;
    tulip_mii_writebits(sc, MII_PREAMBLE, 32);
    tulip_mii_writebits(sc, MII_WRCMD, 8);
    tulip_mii_writebits(sc, devaddr, 5);
    tulip_mii_writebits(sc, regno, 5);
    tulip_mii_turnaround(sc, MII_WRCMD);
    tulip_mii_writebits(sc, data, 16);
}

#define tulip_mchash(mca)       (ether_crc32_le(mca, 6) & 0x1FF)
#define tulip_srom_crcok(databuf)       ( \
    ((ether_crc32_le(databuf, 126) & 0xFFFFU) ^ 0xFFFFU) == \
     ((databuf)[126] | ((databuf)[127] << 8)))

static void
tulip_identify_dec_nic(tulip_softc_t *sc)
{
    strcpy(sc->tulip_boardid, "DEC ");
#define D0      4
    if (sc->tulip_chipid <= TULIP_21040)
        return;
    if (bcmp(sc->tulip_rombuf + 29, "DE500", 5) == 0
        || bcmp(sc->tulip_rombuf + 29, "DE450", 5) == 0) {
        bcopy(sc->tulip_rombuf + 29, &sc->tulip_boardid[D0], 8);
        sc->tulip_boardid[D0+8] = ' ';
    }
#undef D0
}

static void
tulip_identify_znyx_nic(tulip_softc_t * const sc)
{
    u_int id = 0;
    strcpy(sc->tulip_boardid, "ZNYX ZX3XX ");
    if (sc->tulip_chipid == TULIP_21140 || sc->tulip_chipid == TULIP_21140A) {
        u_int znyx_ptr;
        sc->tulip_boardid[8] = '4';
        znyx_ptr = sc->tulip_rombuf[124] + 256 * sc->tulip_rombuf[125];
        if (znyx_ptr < 26 || znyx_ptr > 116) {
            sc->tulip_boardsw = &tulip_21140_znyx_zx34x_boardsw;
            return;
        }
        /* ZX344 = 0010 .. 0013FF
         */
        if (sc->tulip_rombuf[znyx_ptr] == 0x4A
                && sc->tulip_rombuf[znyx_ptr + 1] == 0x52
                && sc->tulip_rombuf[znyx_ptr + 2] == 0x01) {
            id = sc->tulip_rombuf[znyx_ptr + 5] + 256 * sc->tulip_rombuf[znyx_ptr + 4];
            if ((id >> 8) == (TULIP_ZNYX_ID_ZX342 >> 8)) {
                sc->tulip_boardid[9] = '2';
                if (id == TULIP_ZNYX_ID_ZX342B) {
                    sc->tulip_boardid[10] = 'B';
                    sc->tulip_boardid[11] = ' ';
                }
                sc->tulip_boardsw = &tulip_21140_znyx_zx34x_boardsw;
            } else if (id == TULIP_ZNYX_ID_ZX344) {
                sc->tulip_boardid[10] = '4';
                sc->tulip_boardsw = &tulip_21140_znyx_zx34x_boardsw;
            } else if (id == TULIP_ZNYX_ID_ZX345) {
                sc->tulip_boardid[9] = (sc->tulip_rombuf[19] > 1) ? '8' : '5';
            } else if (id == TULIP_ZNYX_ID_ZX346) {
                sc->tulip_boardid[9] = '6';
            } else if (id == TULIP_ZNYX_ID_ZX351) {
                sc->tulip_boardid[8] = '5';
                sc->tulip_boardid[9] = '1';
            }
        }
        if (id == 0) {
            /*
             * Assume it's a ZX342...
             */
            sc->tulip_boardsw = &tulip_21140_znyx_zx34x_boardsw;
        }
        return;
    }
    sc->tulip_boardid[8] = '1';
    if (sc->tulip_chipid == TULIP_21041) {
        sc->tulip_boardid[10] = '1';
        return;
    }
    if (sc->tulip_rombuf[32] == 0x4A && sc->tulip_rombuf[33] == 0x52) {
        id = sc->tulip_rombuf[37] + 256 * sc->tulip_rombuf[36];
        if (id == TULIP_ZNYX_ID_ZX312T) {
            sc->tulip_boardid[9] = '2';
            sc->tulip_boardid[10] = 'T';
            sc->tulip_boardid[11] = ' ';
            sc->tulip_boardsw = &tulip_21040_10baset_only_boardsw;
        } else if (id == TULIP_ZNYX_ID_ZX314_INTA) {
            sc->tulip_boardid[9] = '4';
            sc->tulip_boardsw = &tulip_21040_10baset_only_boardsw;
            sc->tulip_features |= TULIP_HAVE_SHAREDINTR|TULIP_HAVE_BASEROM;
        } else if (id == TULIP_ZNYX_ID_ZX314) {
            sc->tulip_boardid[9] = '4';
            sc->tulip_boardsw = &tulip_21040_10baset_only_boardsw;
            sc->tulip_features |= TULIP_HAVE_BASEROM;
        } else if (id == TULIP_ZNYX_ID_ZX315_INTA) {
            sc->tulip_boardid[9] = '5';
            sc->tulip_features |= TULIP_HAVE_SHAREDINTR|TULIP_HAVE_BASEROM;
        } else if (id == TULIP_ZNYX_ID_ZX315) {
            sc->tulip_boardid[9] = '5';
            sc->tulip_features |= TULIP_HAVE_BASEROM;
        } else {
            id = 0;
        }
    }               
    if (id == 0) {
        if ((sc->arpcom.ac_enaddr[3] & ~3) == 0xF0 && (sc->arpcom.ac_enaddr[5] & 2) == 0) {
            sc->tulip_boardid[9] = '4';
            sc->tulip_boardsw = &tulip_21040_10baset_only_boardsw;
            sc->tulip_features |= TULIP_HAVE_SHAREDINTR|TULIP_HAVE_BASEROM;
        } else if ((sc->arpcom.ac_enaddr[3] & ~3) == 0xF4 && (sc->arpcom.ac_enaddr[5] & 1) == 0) {
            sc->tulip_boardid[9] = '5';
            sc->tulip_boardsw = &tulip_21040_boardsw;
            sc->tulip_features |= TULIP_HAVE_SHAREDINTR|TULIP_HAVE_BASEROM;
        } else if ((sc->arpcom.ac_enaddr[3] & ~3) == 0xEC) {
            sc->tulip_boardid[9] = '2';
            sc->tulip_boardsw = &tulip_21040_boardsw;
        }
    }
}

static void
tulip_identify_smc_nic(tulip_softc_t * const sc)
{
    uint32_t id1, id2, ei;
    int auibnc = 0, utp = 0;
    char *cp;

    strcpy(sc->tulip_boardid, "SMC ");
    if (sc->tulip_chipid == TULIP_21041)
        return;
    if (sc->tulip_chipid != TULIP_21040) {
        if (sc->tulip_boardsw != &tulip_2114x_isv_boardsw) {
            strcpy(&sc->tulip_boardid[4], "9332DST ");
            sc->tulip_boardsw = &tulip_21140_smc9332_boardsw;
        } else if (sc->tulip_features & (TULIP_HAVE_BASEROM|TULIP_HAVE_SLAVEDROM)) {
            strcpy(&sc->tulip_boardid[4], "9334BDT ");
        } else {
            strcpy(&sc->tulip_boardid[4], "9332BDT ");
        }
        return;
    }
    id1 = sc->tulip_rombuf[0x60] | (sc->tulip_rombuf[0x61] << 8);
    id2 = sc->tulip_rombuf[0x62] | (sc->tulip_rombuf[0x63] << 8);
    ei  = sc->tulip_rombuf[0x66] | (sc->tulip_rombuf[0x67] << 8);

    strcpy(&sc->tulip_boardid[4], "8432");
    cp = &sc->tulip_boardid[8];
    if ((id1 & 1) == 0)
        *cp++ = 'B', auibnc = 1;
    if ((id1 & 0xFF) > 0x32)
        *cp++ = 'T', utp = 1;
    if ((id1 & 0x4000) == 0)
        *cp++ = 'A', auibnc = 1;
    if (id2 == 0x15) {
        sc->tulip_boardid[7] = '4';
        *cp++ = '-';
        *cp++ = 'C';
        *cp++ = 'H';
        *cp++ = (ei ? '2' : '1');
    }
    *cp++ = ' ';
    *cp = '\0';
    if (utp && !auibnc)
        sc->tulip_boardsw = &tulip_21040_10baset_only_boardsw;
    else if (!utp && auibnc)
        sc->tulip_boardsw = &tulip_21040_auibnc_only_boardsw;
}

static void
tulip_identify_cogent_nic(tulip_softc_t * const sc)
{
    strcpy(sc->tulip_boardid, "Cogent ");
    if (sc->tulip_chipid == TULIP_21140 || sc->tulip_chipid == TULIP_21140A) {
        if (sc->tulip_rombuf[32] == TULIP_COGENT_EM100TX_ID) {
            strcat(sc->tulip_boardid, "EM100TX ");
            sc->tulip_boardsw = &tulip_21140_cogent_em100_boardsw;
#if defined(TULIP_COGENT_EM110TX_ID)
        } else if (sc->tulip_rombuf[32] == TULIP_COGENT_EM110TX_ID) {
            strcat(sc->tulip_boardid, "EM110TX ");
            sc->tulip_boardsw = &tulip_21140_cogent_em100_boardsw;
#endif
        } else if (sc->tulip_rombuf[32] == TULIP_COGENT_EM100FX_ID) {
            strcat(sc->tulip_boardid, "EM100FX ");
            sc->tulip_boardsw = &tulip_21140_cogent_em100_boardsw;
        }
        /*
         * Magic number (0x24001109U) is the SubVendor (0x2400) and
         * SubDevId (0x1109) for the ANA6944TX (EM440TX).
         */
        if (*(uint32_t *) sc->tulip_rombuf == 0x24001109U
                && (sc->tulip_features & TULIP_HAVE_BASEROM)) {
            /*
             * Cogent (Adaptec) is still mapping all INTs to INTA of
             * first 21140.  Dumb!  Dumb!
             */
            strcat(sc->tulip_boardid, "EM440TX ");
            sc->tulip_features |= TULIP_HAVE_SHAREDINTR;
        }
    } else if (sc->tulip_chipid == TULIP_21040) {
        sc->tulip_features |= TULIP_HAVE_SHAREDINTR|TULIP_HAVE_BASEROM;
    }
}

static void
tulip_identify_accton_nic(tulip_softc_t * const sc)
{
    strcpy(sc->tulip_boardid, "ACCTON ");
    switch (sc->tulip_chipid) {
        case TULIP_21140A:
            strcat(sc->tulip_boardid, "EN1207 ");
            if (sc->tulip_boardsw != &tulip_2114x_isv_boardsw)
                sc->tulip_boardsw = &tulip_21140_accton_boardsw;
            break;
        case TULIP_21140:
            strcat(sc->tulip_boardid, "EN1207TX ");
            if (sc->tulip_boardsw != &tulip_2114x_isv_boardsw)
                sc->tulip_boardsw = &tulip_21140_eb_boardsw;
            break;
        case TULIP_21040:
            strcat(sc->tulip_boardid, "EN1203 ");
            sc->tulip_boardsw = &tulip_21040_boardsw;
            break;
        case TULIP_21041:
            strcat(sc->tulip_boardid, "EN1203 ");
            sc->tulip_boardsw = &tulip_21041_boardsw;
            break;
        default:
            sc->tulip_boardsw = &tulip_2114x_isv_boardsw;
            break;
    }
}

static void
tulip_identify_asante_nic(tulip_softc_t * const sc)
{
    strcpy(sc->tulip_boardid, "Asante ");
    if ((sc->tulip_chipid == TULIP_21140 || sc->tulip_chipid == TULIP_21140A)
            && sc->tulip_boardsw != &tulip_2114x_isv_boardsw) {
        tulip_media_info_t *mi = sc->tulip_mediainfo;
        int idx;
        /*
         * The Asante Fast Ethernet doesn't always ship with a valid
         * new format SROM.  So if isn't in the new format, we cheat
         * set it up as if we had.
         */

        sc->tulip_gpinit = TULIP_GP_ASANTE_PINS;
        sc->tulip_gpdata = 0;

        TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_ASANTE_PINS|TULIP_GP_PINSET);
        TULIP_CSR_WRITE(sc, csr_gp, TULIP_GP_ASANTE_PHYRESET);
        DELAY(100);
        TULIP_CSR_WRITE(sc, csr_gp, 0);

        mi->mi_type = TULIP_MEDIAINFO_MII;
        mi->mi_gpr_length = 0;
        mi->mi_gpr_offset = 0;
        mi->mi_reset_length = 0;
        mi->mi_reset_offset = 0;

        mi->mi_phyaddr = TULIP_MII_NOPHY;
        for (idx = 20; idx > 0 && mi->mi_phyaddr == TULIP_MII_NOPHY; idx--) {
            DELAY(10000);
            mi->mi_phyaddr = tulip_mii_get_phyaddr(sc, 0);
        }
        if (mi->mi_phyaddr == TULIP_MII_NOPHY) {
            if_printf(&sc->arpcom.ac_if, "can't find phy 0\n");
            return;
        }

        sc->tulip_features |= TULIP_HAVE_MII;
        mi->mi_capabilities  = PHYSTS_10BASET|PHYSTS_10BASET_FD|PHYSTS_100BASETX|PHYSTS_100BASETX_FD;
        mi->mi_advertisement = PHYSTS_10BASET|PHYSTS_10BASET_FD|PHYSTS_100BASETX|PHYSTS_100BASETX_FD;
        mi->mi_full_duplex   = PHYSTS_10BASET_FD|PHYSTS_100BASETX_FD;
        mi->mi_tx_threshold  = PHYSTS_10BASET|PHYSTS_10BASET_FD;
        TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 100BASETX_FD);
        TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 100BASETX);
        TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 100BASET4);
        TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 10BASET_FD);
        TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 10BASET);
        mi->mi_phyid = (tulip_mii_readreg(sc, mi->mi_phyaddr, PHYREG_IDLOW) << 16) |
            tulip_mii_readreg(sc, mi->mi_phyaddr, PHYREG_IDHIGH);

        sc->tulip_boardsw = &tulip_2114x_isv_boardsw;
    }
}

static void
tulip_identify_compex_nic(tulip_softc_t *sc)
{
    strcpy(sc->tulip_boardid, "COMPEX ");
    if (sc->tulip_chipid == TULIP_21140A) {
        int root_unit;
        tulip_softc_t *root_sc = NULL;

        strcat(sc->tulip_boardid, "400TX/PCI ");
        /*
         * All 4 chips on these boards share an interrupt.  This code
         * copied from tulip_read_macaddr.
         */
        sc->tulip_features |= TULIP_HAVE_SHAREDINTR;
        for (root_unit = sc->tulip_unit - 1; root_unit >= 0; root_unit--) {
            root_sc = tulips[root_unit];
            if (root_sc == NULL
                || !(root_sc->tulip_features & TULIP_HAVE_SLAVEDINTR))
                break;
            root_sc = NULL;
        }
        if (root_sc != NULL
            && root_sc->tulip_chipid == sc->tulip_chipid
            && root_sc->tulip_pci_busno == sc->tulip_pci_busno) {
            sc->tulip_features |= TULIP_HAVE_SLAVEDINTR;
            sc->tulip_slaves = root_sc->tulip_slaves;
            root_sc->tulip_slaves = sc;
        } else if(sc->tulip_features & TULIP_HAVE_SLAVEDINTR) {
            if_printf(&sc->arpcom.ac_if, "can't find master device for interrupts");
        }
    } else {
        strcat(sc->tulip_boardid, "unknown ");
    }
    /*      sc->tulip_boardsw = &tulip_21140_eb_boardsw; */
    return;
}

static int
tulip_srom_decode(tulip_softc_t *sc)
{
    u_int idx1, idx2, idx3;

    const tulip_srom_header_t *shp = (const tulip_srom_header_t *) &sc->tulip_rombuf[0];
    const tulip_srom_adapter_info_t *saip = (const tulip_srom_adapter_info_t *) (shp + 1);
    tulip_srom_media_t srom_media;
    tulip_media_info_t *mi = sc->tulip_mediainfo;
    const uint8_t *dp;
    uint32_t leaf_offset, blocks, data;

    for (idx1 = 0; idx1 < shp->sh_adapter_count; idx1++, saip++) {
        if (shp->sh_adapter_count == 1)
            break;
        if (saip->sai_device == sc->tulip_pci_devno)
            break;
    }
    /*
     * Didn't find the right media block for this card.
     */
    if (idx1 == shp->sh_adapter_count)
        return 0;

    /*
     * Save the hardware address.
     */
    bcopy(shp->sh_ieee802_address, sc->arpcom.ac_enaddr, ETHER_ADDR_LEN);
    /*
     * If this is a multiple port card, add the adapter index to the last
     * byte of the hardware address.  (if it isn't multiport, adding 0
     * won't hurt.
     */
    sc->arpcom.ac_enaddr[5] += idx1;

    leaf_offset = saip->sai_leaf_offset_lowbyte
        + saip->sai_leaf_offset_highbyte * 256;
    dp = sc->tulip_rombuf + leaf_offset;
        
    sc->tulip_conntype = (tulip_srom_connection_t) (dp[0] + dp[1] * 256); dp += 2;

    for (idx2 = 0;; idx2++) {
        if (tulip_srom_conninfo[idx2].sc_type == sc->tulip_conntype
                || tulip_srom_conninfo[idx2].sc_type == TULIP_SROM_CONNTYPE_NOT_USED)
            break;
    }
    sc->tulip_connidx = idx2;

    if (sc->tulip_chipid == TULIP_21041) {
        blocks = *dp++;
        for (idx2 = 0; idx2 < blocks; idx2++) {
            tulip_media_t media;
            data = *dp++;
            srom_media = (tulip_srom_media_t) (data & 0x3F);
            for (idx3 = 0; tulip_srom_mediums[idx3].sm_type != TULIP_MEDIA_UNKNOWN; idx3++) {
                if (tulip_srom_mediums[idx3].sm_srom_type == srom_media)
                    break;
            }
            media = tulip_srom_mediums[idx3].sm_type;
            if (media != TULIP_MEDIA_UNKNOWN) {
                if (data & TULIP_SROM_21041_EXTENDED) {
                    mi->mi_type = TULIP_MEDIAINFO_SIA;
                    sc->tulip_mediums[media] = mi;
                    mi->mi_sia_connectivity = dp[0] + dp[1] * 256;
                    mi->mi_sia_tx_rx        = dp[2] + dp[3] * 256;
                    mi->mi_sia_general      = dp[4] + dp[5] * 256;
                    mi++;
                } else {
                    switch (media) {
                        case TULIP_MEDIA_BNC: {
                            TULIP_MEDIAINFO_SIA_INIT(sc, mi, 21041, BNC);
                            mi++;
                            break;
                        }
                        case TULIP_MEDIA_AUI: {
                            TULIP_MEDIAINFO_SIA_INIT(sc, mi, 21041, AUI);
                            mi++;
                            break;
                        }
                        case TULIP_MEDIA_10BASET: {
                            TULIP_MEDIAINFO_SIA_INIT(sc, mi, 21041, 10BASET);
                            mi++;
                            break;
                        }
                        case TULIP_MEDIA_10BASET_FD: {
                            TULIP_MEDIAINFO_SIA_INIT(sc, mi, 21041, 10BASET_FD);
                            mi++;
                            break;
                        }
                        default: {
                            break;
                        }
                    }
                }
            }
            if (data & TULIP_SROM_21041_EXTENDED)       
                dp += 6;
        }
#ifdef notdef
        if (blocks == 0) {
            TULIP_MEDIAINFO_SIA_INIT(sc, mi, 21041, BNC); mi++;
            TULIP_MEDIAINFO_SIA_INIT(sc, mi, 21041, AUI); mi++;
            TULIP_MEDIAINFO_SIA_INIT(sc, mi, 21041, 10BASET); mi++;
            TULIP_MEDIAINFO_SIA_INIT(sc, mi, 21041, 10BASET_FD); mi++;
        }
#endif
    } else {
        unsigned length, type;
        tulip_media_t gp_media = TULIP_MEDIA_UNKNOWN;
        if (sc->tulip_features & TULIP_HAVE_GPR)
            sc->tulip_gpinit = *dp++;
        blocks = *dp++;
        for (idx2 = 0; idx2 < blocks; idx2++) {
            const uint8_t *ep;
            if ((*dp & 0x80) == 0) {
                length = 4;
                type = 0;
            } else {
                length = (*dp++ & 0x7f) - 1;
                type = *dp++ & 0x3f;
            }
            ep = dp + length;
            switch (type & 0x3f) {
                case 0: {       /* 21140[A] GPR block */
                    tulip_media_t media;
                    srom_media = (tulip_srom_media_t)(dp[0] & 0x3f);
                    for (idx3 = 0; tulip_srom_mediums[idx3].sm_type != TULIP_MEDIA_UNKNOWN; idx3++) {
                        if (tulip_srom_mediums[idx3].sm_srom_type == srom_media)
                            break;
                    }
                    media = tulip_srom_mediums[idx3].sm_type;
                    if (media == TULIP_MEDIA_UNKNOWN)
                        break;
                    mi->mi_type = TULIP_MEDIAINFO_GPR;
                    sc->tulip_mediums[media] = mi;
                    mi->mi_gpdata = dp[1];
                    if (media > gp_media && !TULIP_IS_MEDIA_FD(media)) {
                        sc->tulip_gpdata = mi->mi_gpdata;
                        gp_media = media;
                    }
                    data = dp[2] + dp[3] * 256;
                    mi->mi_cmdmode = TULIP_SROM_2114X_CMDBITS(data);
                    if (data & TULIP_SROM_2114X_NOINDICATOR) {
                        mi->mi_actmask = 0;
                    } else {
#if 0
                        mi->mi_default = (data & TULIP_SROM_2114X_DEFAULT) != 0;
#endif
                        mi->mi_actmask = TULIP_SROM_2114X_BITPOS(data);
                        mi->mi_actdata = (data & TULIP_SROM_2114X_POLARITY) ? 0 : mi->mi_actmask;
                    }
                    mi++;
                    break;
                }
                case 1: {       /* 21140[A] MII block */
                    const u_int phyno = *dp++;
                    mi->mi_type = TULIP_MEDIAINFO_MII;
                    mi->mi_gpr_length = *dp++;
                    mi->mi_gpr_offset = dp - sc->tulip_rombuf;
                    dp += mi->mi_gpr_length;
                    mi->mi_reset_length = *dp++;
                    mi->mi_reset_offset = dp - sc->tulip_rombuf;
                    dp += mi->mi_reset_length;

                    /*
                     * Before we probe for a PHY, use the GPR information
                     * to select it.  If we don't, it may be inaccessible.
                     */
                    TULIP_CSR_WRITE(sc, csr_gp, sc->tulip_gpinit|TULIP_GP_PINSET);
                    for (idx3 = 0; idx3 < mi->mi_reset_length; idx3++) {
                        DELAY(10);
                        TULIP_CSR_WRITE(sc, csr_gp, sc->tulip_rombuf[mi->mi_reset_offset + idx3]);
                    }
                    sc->tulip_phyaddr = mi->mi_phyaddr;
                    for (idx3 = 0; idx3 < mi->mi_gpr_length; idx3++) {
                        DELAY(10);
                        TULIP_CSR_WRITE(sc, csr_gp, sc->tulip_rombuf[mi->mi_gpr_offset + idx3]);
                    }

                    /*
                     * At least write something!
                     */
                    if (mi->mi_reset_length == 0 && mi->mi_gpr_length == 0)
                        TULIP_CSR_WRITE(sc, csr_gp, 0);

                    mi->mi_phyaddr = TULIP_MII_NOPHY;
                    for (idx3 = 20; idx3 > 0 && mi->mi_phyaddr == TULIP_MII_NOPHY; idx3--) {
                        DELAY(10000);
                        mi->mi_phyaddr = tulip_mii_get_phyaddr(sc, phyno);
                    }
                    if (mi->mi_phyaddr == TULIP_MII_NOPHY)
                        break;
                    sc->tulip_features |= TULIP_HAVE_MII;
                    mi->mi_capabilities  = dp[0] + dp[1] * 256; dp += 2;
                    mi->mi_advertisement = dp[0] + dp[1] * 256; dp += 2;
                    mi->mi_full_duplex   = dp[0] + dp[1] * 256; dp += 2;
                    mi->mi_tx_threshold  = dp[0] + dp[1] * 256; dp += 2;
                    TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 100BASETX_FD);
                    TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 100BASETX);
                    TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 100BASET4);
                    TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 10BASET_FD);
                    TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 10BASET);
                    mi->mi_phyid = (tulip_mii_readreg(sc, mi->mi_phyaddr, PHYREG_IDLOW) << 16) |
                        tulip_mii_readreg(sc, mi->mi_phyaddr, PHYREG_IDHIGH);
                    mi++;
                    break;
                }
                case 2: {       /* 2114[23] SIA block */
                    tulip_media_t media;
                    srom_media = (tulip_srom_media_t)(dp[0] & 0x3f);
                    for (idx3 = 0; tulip_srom_mediums[idx3].sm_type != TULIP_MEDIA_UNKNOWN; idx3++) {
                        if (tulip_srom_mediums[idx3].sm_srom_type == srom_media)
                            break;
                    }
                    media = tulip_srom_mediums[idx3].sm_type;
                    if (media == TULIP_MEDIA_UNKNOWN)
                        break;
                    mi->mi_type = TULIP_MEDIAINFO_SIA;
                    sc->tulip_mediums[media] = mi;
                    if (dp[0] & 0x40) {
                        mi->mi_sia_connectivity = dp[1] + dp[2] * 256;
                        mi->mi_sia_tx_rx        = dp[3] + dp[4] * 256;
                        mi->mi_sia_general      = dp[5] + dp[6] * 256;
                        dp += 6;
                    } else {
                        switch (media) {
                            case TULIP_MEDIA_BNC: {
                                TULIP_MEDIAINFO_SIA_INIT(sc, mi, 21142, BNC);
                                break;
                            }
                            case TULIP_MEDIA_AUI: {
                                TULIP_MEDIAINFO_SIA_INIT(sc, mi, 21142, AUI);
                                break;
                            }
                            case TULIP_MEDIA_10BASET: {
                                TULIP_MEDIAINFO_SIA_INIT(sc, mi, 21142, 10BASET);
                                sc->tulip_intrmask |= TULIP_STS_LINKPASS|TULIP_STS_LINKFAIL;
                                break;
                            }
                            case TULIP_MEDIA_10BASET_FD: {
                                TULIP_MEDIAINFO_SIA_INIT(sc, mi, 21142, 10BASET_FD);
                                sc->tulip_intrmask |= TULIP_STS_LINKPASS|TULIP_STS_LINKFAIL;
                                break;
                            }
                            default: {
                                goto bad_media;
                            }
                        }
                    }
                    mi->mi_sia_gp_control = (dp[1] + dp[2] * 256) << 16;
                    mi->mi_sia_gp_data    = (dp[3] + dp[4] * 256) << 16;
                    mi++;
                  bad_media:
                    break;
                }
                case 3: {       /* 2114[23] MII PHY block */
                    const u_int phyno = *dp++;
                    const uint8_t *dp0;
                    mi->mi_type = TULIP_MEDIAINFO_MII;
                    mi->mi_gpr_length = *dp++;
                    mi->mi_gpr_offset = dp - sc->tulip_rombuf;
                    dp += 2 * mi->mi_gpr_length;
                    mi->mi_reset_length = *dp++;
                    mi->mi_reset_offset = dp - sc->tulip_rombuf;
                    dp += 2 * mi->mi_reset_length;

                    dp0 = &sc->tulip_rombuf[mi->mi_reset_offset];
                    for (idx3 = 0; idx3 < mi->mi_reset_length; idx3++, dp0 += 2) {
                        DELAY(10);
                        TULIP_CSR_WRITE(sc, csr_sia_general, (dp0[0] + 256 * dp0[1]) << 16);
                    }
                    sc->tulip_phyaddr = mi->mi_phyaddr;
                    dp0 = &sc->tulip_rombuf[mi->mi_gpr_offset];
                    for (idx3 = 0; idx3 < mi->mi_gpr_length; idx3++, dp0 += 2) {
                        DELAY(10);
                        TULIP_CSR_WRITE(sc, csr_sia_general, (dp0[0] + 256 * dp0[1]) << 16);
                    }

                    if (mi->mi_reset_length == 0 && mi->mi_gpr_length == 0)
                        TULIP_CSR_WRITE(sc, csr_sia_general, 0);

                    mi->mi_phyaddr = TULIP_MII_NOPHY;
                    for (idx3 = 20; idx3 > 0 && mi->mi_phyaddr == TULIP_MII_NOPHY; idx3--) {
                        DELAY(10000);
                        mi->mi_phyaddr = tulip_mii_get_phyaddr(sc, phyno);
                    }
                    if (mi->mi_phyaddr == TULIP_MII_NOPHY)
                        break;
                    sc->tulip_features |= TULIP_HAVE_MII;
                    mi->mi_capabilities  = dp[0] + dp[1] * 256; dp += 2;
                    mi->mi_advertisement = dp[0] + dp[1] * 256; dp += 2;
                    mi->mi_full_duplex   = dp[0] + dp[1] * 256; dp += 2;
                    mi->mi_tx_threshold  = dp[0] + dp[1] * 256; dp += 2;
                    mi->mi_mii_interrupt = dp[0] + dp[1] * 256; dp += 2;
                    TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 100BASETX_FD);
                    TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 100BASETX);
                    TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 100BASET4);
                    TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 10BASET_FD);
                    TULIP_MEDIAINFO_ADD_CAPABILITY(sc, mi, 10BASET);
                    mi->mi_phyid = (tulip_mii_readreg(sc, mi->mi_phyaddr, PHYREG_IDLOW) << 16) |
                        tulip_mii_readreg(sc, mi->mi_phyaddr, PHYREG_IDHIGH);
                    mi++;
                    break;
                }
                case 4: {       /* 21143 SYM block */
                    tulip_media_t media;
                    srom_media = (tulip_srom_media_t) dp[0];
                    for (idx3 = 0; tulip_srom_mediums[idx3].sm_type != TULIP_MEDIA_UNKNOWN; idx3++) {
                        if (tulip_srom_mediums[idx3].sm_srom_type == srom_media)
                            break;
                    }
                    media = tulip_srom_mediums[idx3].sm_type;
                    if (media == TULIP_MEDIA_UNKNOWN)
                        break;
                    mi->mi_type = TULIP_MEDIAINFO_SYM;
                    sc->tulip_mediums[media] = mi;
                    mi->mi_gpcontrol = (dp[1] + dp[2] * 256) << 16;
                    mi->mi_gpdata    = (dp[3] + dp[4] * 256) << 16;
                    data = dp[5] + dp[6] * 256;
                    mi->mi_cmdmode = TULIP_SROM_2114X_CMDBITS(data);
                    if (data & TULIP_SROM_2114X_NOINDICATOR) {
                        mi->mi_actmask = 0;
                    } else {
                        mi->mi_default = (data & TULIP_SROM_2114X_DEFAULT) != 0;
                        mi->mi_actmask = TULIP_SROM_2114X_BITPOS(data);
                        mi->mi_actdata = (data & TULIP_SROM_2114X_POLARITY) ? 0 : mi->mi_actmask;
                    }
                    if (TULIP_IS_MEDIA_TP(media))
                        sc->tulip_intrmask |= TULIP_STS_LINKPASS|TULIP_STS_LINKFAIL;
                    mi++;
                    break;
                }
#if 0
                case 5: {       /* 21143 Reset block */
                    mi->mi_type = TULIP_MEDIAINFO_RESET;
                    mi->mi_reset_length = *dp++;
                    mi->mi_reset_offset = dp - sc->tulip_rombuf;
                    dp += 2 * mi->mi_reset_length;
                    mi++;
                    break;
                }
#endif
                default: {
                }
            }
            dp = ep;
        }
    }
    return mi - sc->tulip_mediainfo;
}

static const struct {
    void (*vendor_identify_nic)(tulip_softc_t * const sc);
    unsigned char vendor_oui[3];
} tulip_vendors[] = {
    { tulip_identify_dec_nic,           { 0x08, 0x00, 0x2B } },
    { tulip_identify_dec_nic,           { 0x00, 0x00, 0xF8 } },
    { tulip_identify_smc_nic,           { 0x00, 0x00, 0xC0 } },
    { tulip_identify_smc_nic,           { 0x00, 0xE0, 0x29 } },
    { tulip_identify_znyx_nic,          { 0x00, 0xC0, 0x95 } },
    { tulip_identify_cogent_nic,        { 0x00, 0x00, 0x92 } },
    { tulip_identify_asante_nic,        { 0x00, 0x00, 0x94 } },
    { tulip_identify_cogent_nic,        { 0x00, 0x00, 0xD1 } },
    { tulip_identify_accton_nic,        { 0x00, 0x00, 0xE8 } },
    { tulip_identify_compex_nic,        { 0x00, 0x80, 0x48 } },
    { NULL }
};

/*
 * This deals with the vagaries of the address roms and the
 * brain-deadness that various vendors commit in using them.
 */
static int
tulip_read_macaddr(tulip_softc_t *sc)
{
    u_int cksum, rom_cksum, idx;
    uint32_t csr;
    unsigned char tmpbuf[8];
    static const u_char testpat[] = { 0xFF, 0, 0x55, 0xAA, 0xFF, 0, 0x55, 0xAA };

    sc->tulip_connidx = TULIP_SROM_LASTCONNIDX;

    if (sc->tulip_chipid == TULIP_21040) {
        TULIP_CSR_WRITE(sc, csr_enetrom, 1);
        for (idx = 0; idx < sizeof(sc->tulip_rombuf); idx++) {
            int cnt = 0;
            while (((csr = TULIP_CSR_READ(sc, csr_enetrom)) & 0x80000000L) && cnt < 10000)
                cnt++;
            sc->tulip_rombuf[idx] = csr & 0xFF;
        }
        sc->tulip_boardsw = &tulip_21040_boardsw;
    } else {
        if (sc->tulip_chipid == TULIP_21041) {
            /*
             * Thankfully all 21041's act the same.
             */
            sc->tulip_boardsw = &tulip_21041_boardsw;
        } else {
            /*
             * Assume all 21140 board are compatible with the
             * DEC 10/100 evaluation board.  Not really valid but
             * it's the best we can do until every one switches to
             * the new SROM format.
             */

            sc->tulip_boardsw = &tulip_21140_eb_boardsw;
        }
        tulip_srom_read(sc);
        if (tulip_srom_crcok(sc->tulip_rombuf)) {
            /*
             * SROM CRC is valid therefore it must be in the
             * new format.
             */
            sc->tulip_features |= TULIP_HAVE_ISVSROM|TULIP_HAVE_OKSROM;
        } else if (sc->tulip_rombuf[126] == 0xff && sc->tulip_rombuf[127] == 0xFF) {
            /*
             * No checksum is present.  See if the SROM id checks out;
             * the first 18 bytes should be 0 followed by a 1 followed
             * by the number of adapters (which we don't deal with yet).
             */
            for (idx = 0; idx < 18; idx++) {
                if (sc->tulip_rombuf[idx] != 0)
                    break;
            }
            if (idx == 18 && sc->tulip_rombuf[18] == 1 && sc->tulip_rombuf[19] != 0)
                sc->tulip_features |= TULIP_HAVE_ISVSROM;
        } else if (sc->tulip_chipid >= TULIP_21142) {
            sc->tulip_features |= TULIP_HAVE_ISVSROM;
            sc->tulip_boardsw = &tulip_2114x_isv_boardsw;
        }
        if ((sc->tulip_features & TULIP_HAVE_ISVSROM) && tulip_srom_decode(sc)) {
            if (sc->tulip_chipid != TULIP_21041)
                sc->tulip_boardsw = &tulip_2114x_isv_boardsw;

            /*
             * If the SROM specifies more than one adapter, tag this as a
             * BASE rom.
             */
            if (sc->tulip_rombuf[19] > 1)
                sc->tulip_features |= TULIP_HAVE_BASEROM;
            if (sc->tulip_boardsw == NULL)
                return -6;
            goto check_oui;
        }
    }


    if (bcmp(&sc->tulip_rombuf[0], &sc->tulip_rombuf[16], 8) != 0) {
        /*
         * Some folks don't use the standard ethernet rom format
         * but instead just put the address in the first 6 bytes
         * of the rom and let the rest be all 0xffs.  (Can we say
         * ZNYX?) (well sometimes they put in a checksum so we'll
         * start at 8).
         */
        for (idx = 8; idx < 32; idx++) {
            if (sc->tulip_rombuf[idx] != 0xFF)
                return -4;
        }
        /*
         * Make sure the address is not multicast or locally assigned
         * that the OUI is not 00-00-00.
         */
        if ((sc->tulip_rombuf[0] & 3) != 0)
            return -4;
        if (sc->tulip_rombuf[0] == 0 && sc->tulip_rombuf[1] == 0
                && sc->tulip_rombuf[2] == 0)
            return -4;
        bcopy(sc->tulip_rombuf, sc->arpcom.ac_enaddr, ETHER_ADDR_LEN);
        sc->tulip_features |= TULIP_HAVE_OKROM;
        goto check_oui;
    } else {
        /*
         * A number of makers of multiport boards (ZNYX and Cogent)
         * only put on one address ROM on their 21040 boards.  So
         * if the ROM is all zeros (or all 0xFFs), look at the
         * previous configured boards (as long as they are on the same
         * PCI bus and the bus number is non-zero) until we find the
         * master board with address ROM.  We then use its address ROM
         * as the base for this board.  (we add our relative board
         * to the last byte of its address).
         */
        for (idx = 0; idx < sizeof(sc->tulip_rombuf); idx++) {
            if (sc->tulip_rombuf[idx] != 0 && sc->tulip_rombuf[idx] != 0xFF)
                break;
        }
        if (idx == sizeof(sc->tulip_rombuf)) {
            int root_unit;
            tulip_softc_t *root_sc = NULL;
            for (root_unit = sc->tulip_unit - 1; root_unit >= 0; root_unit--) {
                root_sc = tulips[root_unit];
                if (root_sc == NULL || (root_sc->tulip_features & (TULIP_HAVE_OKROM|TULIP_HAVE_SLAVEDROM)) == TULIP_HAVE_OKROM)
                    break;
                root_sc = NULL;
            }
            if (root_sc != NULL && (root_sc->tulip_features & TULIP_HAVE_BASEROM)
                    && root_sc->tulip_chipid == sc->tulip_chipid
                    && root_sc->tulip_pci_busno == sc->tulip_pci_busno) {
                sc->tulip_features |= TULIP_HAVE_SLAVEDROM;
                sc->tulip_boardsw = root_sc->tulip_boardsw;
                strcpy(sc->tulip_boardid, root_sc->tulip_boardid);
                if (sc->tulip_boardsw->bd_type == TULIP_21140_ISV) {
                    bcopy(root_sc->tulip_rombuf, sc->tulip_rombuf,
                          sizeof(sc->tulip_rombuf));
                    if (!tulip_srom_decode(sc))
                        return -5;
                } else {
                    bcopy(root_sc->arpcom.ac_enaddr, sc->arpcom.ac_enaddr,
                        ETHER_ADDR_LEN);
                    sc->arpcom.ac_enaddr[5] += sc->tulip_unit - root_sc->tulip_unit;
                }
                /*
                 * Now for a truly disgusting kludge: all 4 21040s on
                 * the ZX314 share the same INTA line so the mapping
                 * setup by the BIOS on the PCI bridge is worthless.
                 * Rather than reprogramming the value in the config
                 * register, we will handle this internally.
                 */
                if (root_sc->tulip_features & TULIP_HAVE_SHAREDINTR) {
                    sc->tulip_slaves = root_sc->tulip_slaves;
                    root_sc->tulip_slaves = sc;
                    sc->tulip_features |= TULIP_HAVE_SLAVEDINTR;
                }
                return 0;
            }
        }
    }

    /*
     * This is the standard DEC address ROM test.
     */

    if (bcmp(&sc->tulip_rombuf[24], testpat, 8) != 0)
        return -3;

    tmpbuf[0] = sc->tulip_rombuf[15]; tmpbuf[1] = sc->tulip_rombuf[14];
    tmpbuf[2] = sc->tulip_rombuf[13]; tmpbuf[3] = sc->tulip_rombuf[12];
    tmpbuf[4] = sc->tulip_rombuf[11]; tmpbuf[5] = sc->tulip_rombuf[10];
    tmpbuf[6] = sc->tulip_rombuf[9];  tmpbuf[7] = sc->tulip_rombuf[8];
    if (bcmp(&sc->tulip_rombuf[0], tmpbuf, 8) != 0)
        return -2;

    bcopy(sc->tulip_rombuf, sc->arpcom.ac_enaddr, ETHER_ADDR_LEN);

    cksum = *(u_int16_t *) &sc->arpcom.ac_enaddr[0];
    cksum *= 2;
    if (cksum > 65535) cksum -= 65535;
    cksum += *(u_int16_t *) &sc->arpcom.ac_enaddr[2];
    if (cksum > 65535) cksum -= 65535;
    cksum *= 2;
    if (cksum > 65535) cksum -= 65535;
    cksum += *(u_int16_t *) &sc->arpcom.ac_enaddr[4];
    if (cksum >= 65535) cksum -= 65535;

    rom_cksum = *(u_int16_t *) &sc->tulip_rombuf[6];
        
    if (cksum != rom_cksum)
        return -1;

  check_oui:
    /*
     * Check for various boards based on OUI.  Did I say braindead?
     */
    for (idx = 0; tulip_vendors[idx].vendor_identify_nic != NULL; idx++) {
        if (bcmp(sc->arpcom.ac_enaddr, tulip_vendors[idx].vendor_oui, 3) == 0) {
            (*tulip_vendors[idx].vendor_identify_nic)(sc);
            break;
        }
    }

    sc->tulip_features |= TULIP_HAVE_OKROM;
    return 0;
}

static void
tulip_ifmedia_add(tulip_softc_t * const sc)
{
    tulip_media_t media;
    int medias = 0;

    for (media = TULIP_MEDIA_UNKNOWN; media < TULIP_MEDIA_MAX; media++) {
        if (sc->tulip_mediums[media] != NULL) {
            ifmedia_add(&sc->tulip_ifmedia, tulip_media_to_ifmedia[media],
                        0, 0);
            medias++;
        }
    }
    if (medias == 0) {
        sc->tulip_features |= TULIP_HAVE_NOMEDIA;
        ifmedia_add(&sc->tulip_ifmedia, IFM_ETHER | IFM_NONE, 0, 0);
        ifmedia_set(&sc->tulip_ifmedia, IFM_ETHER | IFM_NONE);
    } else if (sc->tulip_media == TULIP_MEDIA_UNKNOWN) {
        ifmedia_add(&sc->tulip_ifmedia, IFM_ETHER | IFM_AUTO, 0, 0);
        ifmedia_set(&sc->tulip_ifmedia, IFM_ETHER | IFM_AUTO);
    } else {
        ifmedia_set(&sc->tulip_ifmedia, tulip_media_to_ifmedia[sc->tulip_media]);
        sc->tulip_flags |= TULIP_PRINTMEDIA;
        tulip_linkup(sc, sc->tulip_media);
    }
}

static int
tulip_ifmedia_change(struct ifnet *ifp)
{
    tulip_softc_t *sc = (tulip_softc_t *)ifp->if_softc;

    sc->tulip_flags |= TULIP_NEEDRESET;
    sc->tulip_probe_state = TULIP_PROBE_INACTIVE;
    sc->tulip_media = TULIP_MEDIA_UNKNOWN;
    if (IFM_SUBTYPE(sc->tulip_ifmedia.ifm_media) != IFM_AUTO) {
        tulip_media_t media;
        for (media = TULIP_MEDIA_UNKNOWN; media < TULIP_MEDIA_MAX; media++) {
            if (sc->tulip_mediums[media] != NULL
                && sc->tulip_ifmedia.ifm_media == tulip_media_to_ifmedia[media]) {
                sc->tulip_flags |= TULIP_PRINTMEDIA;
                sc->tulip_flags &= ~TULIP_DIDNWAY;
                tulip_linkup(sc, media);
                return 0;
            }
        }
    }
    sc->tulip_flags &= ~(TULIP_TXPROBE_ACTIVE|TULIP_WANTRXACT);
    tulip_reset(sc);
    tulip_init(sc);
    return 0;
}

/*
 * Media status callback
 */
static void
tulip_ifmedia_status(struct ifnet *ifp, struct ifmediareq *req)
{
    tulip_softc_t *sc = (tulip_softc_t *)ifp->if_softc;

    if (sc->tulip_media == TULIP_MEDIA_UNKNOWN)
        return;

    req->ifm_status = IFM_AVALID;
    if (sc->tulip_flags & TULIP_LINKUP)
        req->ifm_status |= IFM_ACTIVE;

    req->ifm_active = tulip_media_to_ifmedia[sc->tulip_media];
}

static void
tulip_addr_filter(tulip_softc_t *sc)
{
    struct ifmultiaddr *ifma;
    struct ifnet *ifp;
    u_char *addrp;
    int multicnt;

    sc->tulip_flags &= ~(TULIP_WANTHASHPERFECT|TULIP_WANTHASHONLY|TULIP_ALLMULTI);
    sc->tulip_flags |= TULIP_WANTSETUP|TULIP_WANTTXSTART;
    sc->tulip_cmdmode &= ~TULIP_CMD_RXRUN;
    sc->tulip_intrmask &= ~TULIP_STS_RXSTOPPED;
#if defined(IFF_ALLMULTI)    
    if (sc->arpcom.ac_if.if_flags & IFF_ALLMULTI)
        sc->tulip_flags |= TULIP_ALLMULTI ;
#endif

    multicnt = 0;
    ifp = &sc->arpcom.ac_if;
    TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
            if (ifma->ifma_addr->sa_family == AF_LINK)
                multicnt++;
    }

    if (multicnt > 14) {
        uint32_t *sp = sc->tulip_setupdata;
        u_int hash;
        /*
         * Some early passes of the 21140 have broken implementations of
         * hash-perfect mode.  When we get too many multicasts for perfect
         * filtering with these chips, we need to switch into hash-only
         * mode (this is better than all-multicast on network with lots
         * of multicast traffic).
         */
        if (sc->tulip_features & TULIP_HAVE_BROKEN_HASH)
            sc->tulip_flags |= TULIP_WANTHASHONLY;
        else
            sc->tulip_flags |= TULIP_WANTHASHPERFECT;
        /*
         * If we have more than 14 multicasts, we have
         * go into hash perfect mode (512 bit multicast
         * hash and one perfect hardware).
         */
        bzero(sc->tulip_setupdata, sizeof(sc->tulip_setupdata));

        TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
                if (ifma->ifma_addr->sa_family != AF_LINK)
                        continue;

                hash = tulip_mchash(LLADDR((struct sockaddr_dl *)ifma->ifma_addr));
                sp[hash >> 4] |= htole32(1 << (hash & 0xF));
        }
        /*
         * No reason to use a hash if we are going to be
         * receiving every multicast.
         */
        if ((sc->tulip_flags & TULIP_ALLMULTI) == 0) {
            hash = tulip_mchash(ifp->if_broadcastaddr);
            sp[hash >> 4] |= htole32(1 << (hash & 0xF));
            if (sc->tulip_flags & TULIP_WANTHASHONLY) {
                hash = tulip_mchash(sc->arpcom.ac_enaddr);
                sp[hash >> 4] |= htole32(1 << (hash & 0xF));
            } else {
                sp[39] = TULIP_SP_MAC(((u_int16_t *)sc->arpcom.ac_enaddr)[0]);
                sp[40] = TULIP_SP_MAC(((u_int16_t *)sc->arpcom.ac_enaddr)[1]);
                sp[41] = TULIP_SP_MAC(((u_int16_t *)sc->arpcom.ac_enaddr)[2]);
            }
        }
    }
    if ((sc->tulip_flags & (TULIP_WANTHASHPERFECT|TULIP_WANTHASHONLY)) == 0) {
        uint32_t *sp = sc->tulip_setupdata;
        int idx = 0;
        if ((sc->tulip_flags & TULIP_ALLMULTI) == 0) {
            /*
             * Else can get perfect filtering for 16 addresses.
             */
            TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
                    if (ifma->ifma_addr->sa_family != AF_LINK)
                            continue;
                    addrp = LLADDR((struct sockaddr_dl *)ifma->ifma_addr);
                    *sp++ = TULIP_SP_MAC(((u_int16_t *)addrp)[0]);
                    *sp++ = TULIP_SP_MAC(((u_int16_t *)addrp)[1]);
                    *sp++ = TULIP_SP_MAC(((u_int16_t *)addrp)[2]);
                    idx++;
            }
            /*
             * Add the broadcast address.
             */
            idx++;
            *sp++ = TULIP_SP_MAC(0xFFFF);
            *sp++ = TULIP_SP_MAC(0xFFFF);
            *sp++ = TULIP_SP_MAC(0xFFFF);
        }
        /*
         * Pad the rest with our hardware address
         */
        for (; idx < 16; idx++) {
            *sp++ = TULIP_SP_MAC(((u_int16_t *)sc->arpcom.ac_enaddr)[0]);
            *sp++ = TULIP_SP_MAC(((u_int16_t *)sc->arpcom.ac_enaddr)[1]);
            *sp++ = TULIP_SP_MAC(((u_int16_t *)sc->arpcom.ac_enaddr)[2]);
        }
    }
#if defined(IFF_ALLMULTI)
    if (sc->tulip_flags & TULIP_ALLMULTI)
        sc->arpcom.ac_if.if_flags |= IFF_ALLMULTI;
#endif
}

static void
tulip_reset(tulip_softc_t *sc)
{
    tulip_ringinfo_t *ri;
    tulip_descinfo_t *di;
    struct mbuf *m;
    uint32_t inreset = (sc->tulip_flags & TULIP_INRESET);

    /*
     * Brilliant.  Simply brilliant.  When switching modes/speeds
     * on a 2114*, you need to set the appriopriate MII/PCS/SCL/PS
     * bits in CSR6 and then do a software reset to get the 21140
     * to properly reset its internal pathways to the right places.
     *   Grrrr.
     */
    if ((sc->tulip_flags & TULIP_DEVICEPROBE) == 0
            && sc->tulip_boardsw->bd_media_preset != NULL)
        (*sc->tulip_boardsw->bd_media_preset)(sc);

    TULIP_CSR_WRITE(sc, csr_busmode, TULIP_BUSMODE_SWRESET);
    DELAY(10);  /* Wait 10 microseconds (actually 50 PCI cycles but at 
                   33MHz that comes to two microseconds but wait a
                   bit longer anyways) */

    if (!inreset) {
        sc->tulip_flags |= TULIP_INRESET;
        sc->tulip_flags &= ~(TULIP_NEEDRESET|TULIP_RXBUFSLOW);
        ifq_clr_oactive(&sc->arpcom.ac_if.if_snd);
    }

    TULIP_CSR_WRITE(sc, csr_txlist, sc->tulip_txinfo.ri_dma_addr & 0xffffffff);
    TULIP_CSR_WRITE(sc, csr_rxlist, sc->tulip_rxinfo.ri_dma_addr & 0xffffffff);
    TULIP_CSR_WRITE(sc, csr_busmode,
                    (1 << (3 /*pci_max_burst_len*/ + 8))
                    |TULIP_BUSMODE_CACHE_ALIGN8
                    |TULIP_BUSMODE_READMULTIPLE
                    |(BYTE_ORDER != LITTLE_ENDIAN ?
                      TULIP_BUSMODE_DESC_BIGENDIAN : 0));

    sc->tulip_txtimer = 0;
    sc->tulip_txq.ifq_maxlen = TULIP_TXDESCS;
    /*
     * Free all the mbufs that were on the transmit ring.
     */
    ri = &sc->tulip_txinfo;
    for (di = ri->ri_first; di < ri->ri_last; di++) {
        m = tulip_dequeue_mbuf(ri, di, SYNC_NONE);
        if (m != NULL)
            m_freem(m);
        di->di_desc->d_status = 0;
    }

    ri->ri_nextin = ri->ri_nextout = ri->ri_first;
    ri->ri_free = ri->ri_max;
    TULIP_TXDESC_PRESYNC(ri);

    /*
     * We need to collect all the mbufs that were on the
     * receive ring before we reinit it either to put
     * them back on or to know if we have to allocate
     * more.
     */
    ri = &sc->tulip_rxinfo;
    ri->ri_nextin = ri->ri_nextout = ri->ri_first;
    ri->ri_free = ri->ri_max;
    for (di = ri->ri_first; di < ri->ri_last; di++) {
        di->di_desc->d_status = 0;
        di->di_desc->d_length1 = 0; di->di_desc->d_addr1 = 0;
        di->di_desc->d_length2 = 0; di->di_desc->d_addr2 = 0;
    }
    TULIP_RXDESC_PRESYNC(ri);
    for (di = ri->ri_first; di < ri->ri_last; di++) {
        m = tulip_dequeue_mbuf(ri, di, SYNC_NONE);
        if (m != NULL)
            m_freem(m);
    }

    /*
     * If tulip_reset is being called recursively, exit quickly knowing
     * that when the outer tulip_reset returns all the right stuff will
     * have happened.
     */
    if (inreset)
        return;

    sc->tulip_intrmask |= TULIP_STS_NORMALINTR|TULIP_STS_RXINTR|TULIP_STS_TXINTR
        |TULIP_STS_ABNRMLINTR|TULIP_STS_SYSERROR|TULIP_STS_TXSTOPPED
        |TULIP_STS_TXUNDERFLOW|TULIP_STS_TXBABBLE
        |TULIP_STS_RXSTOPPED;

    if ((sc->tulip_flags & TULIP_DEVICEPROBE) == 0)
        (*sc->tulip_boardsw->bd_media_select)(sc);
    tulip_media_print(sc);
    if (sc->tulip_features & TULIP_HAVE_DUALSENSE)
        TULIP_CSR_WRITE(sc, csr_sia_status, TULIP_CSR_READ(sc, csr_sia_status));

    sc->tulip_flags &= ~(TULIP_DOINGSETUP|TULIP_WANTSETUP|TULIP_INRESET
                         |TULIP_RXACT);
    tulip_addr_filter(sc);
}

static void
tulip_init(tulip_softc_t * const sc)
{
    if (sc->arpcom.ac_if.if_flags & IFF_UP) {
        if ((sc->arpcom.ac_if.if_flags & IFF_RUNNING) == 0) {
            /* initialize the media */
            tulip_reset(sc);
        }
        sc->arpcom.ac_if.if_flags |= IFF_RUNNING;
        if (sc->arpcom.ac_if.if_flags & IFF_PROMISC) {
            sc->tulip_flags |= TULIP_PROMISC;
            sc->tulip_cmdmode |= TULIP_CMD_PROMISCUOUS;
            sc->tulip_intrmask |= TULIP_STS_TXINTR;
        } else {
            sc->tulip_flags &= ~TULIP_PROMISC;
            sc->tulip_cmdmode &= ~TULIP_CMD_PROMISCUOUS;
            if (sc->tulip_flags & TULIP_ALLMULTI) {
                sc->tulip_cmdmode |= TULIP_CMD_ALLMULTI;
            } else {
                sc->tulip_cmdmode &= ~TULIP_CMD_ALLMULTI;
            }
        }
        sc->tulip_cmdmode |= TULIP_CMD_TXRUN;
        if ((sc->tulip_flags & (TULIP_TXPROBE_ACTIVE|TULIP_WANTSETUP)) == 0) {
            tulip_rx_intr(sc);
            sc->tulip_cmdmode |= TULIP_CMD_RXRUN;
            sc->tulip_intrmask |= TULIP_STS_RXSTOPPED;
        } else {
            ifq_set_oactive(&sc->arpcom.ac_if.if_snd);
            sc->tulip_cmdmode &= ~TULIP_CMD_RXRUN;
            sc->tulip_intrmask &= ~TULIP_STS_RXSTOPPED;
        }
        TULIP_CSR_WRITE(sc, csr_intr, sc->tulip_intrmask);
        TULIP_CSR_WRITE(sc, csr_command, sc->tulip_cmdmode);
        if ((sc->tulip_flags & (TULIP_WANTSETUP|TULIP_TXPROBE_ACTIVE)) == TULIP_WANTSETUP)
            tulip_txput_setup(sc);
    } else {
        sc->arpcom.ac_if.if_flags &= ~IFF_RUNNING;
        tulip_reset(sc);
    }
}

#define DESC_STATUS(di) (((volatile tulip_desc_t *)((di)->di_desc))->d_status)
#define DESC_FLAG(di)   ((di)->di_desc->d_flag)

static void
tulip_rx_intr(tulip_softc_t *sc)
{
    tulip_ringinfo_t *ri = &sc->tulip_rxinfo;
    struct ifnet *ifp = &sc->arpcom.ac_if;
    int fillok = 1;

    for (;;) {
        tulip_descinfo_t *eop = ri->ri_nextin, *dip;
        int total_len = 0, last_offset = 0;
        struct mbuf *ms = NULL, *me = NULL;
        int accept = 0;
        int error;

        if (fillok && (ri->ri_max - ri->ri_free) < TULIP_RXQ_TARGET)
            goto queue_mbuf;

        /*
         * If the TULIP has no descriptors, there can't be any receive
         * descriptors to process.
         */
        if (eop == ri->ri_nextout)
            break;

        /*
         * 90% of the packets will fit in one descriptor.  So we optimize
         * for that case.
         */
        TULIP_RXDESC_POSTSYNC(ri);
        if ((DESC_STATUS(eop) & (TULIP_DSTS_OWNER|TULIP_DSTS_RxFIRSTDESC|TULIP_DSTS_RxLASTDESC)) == (TULIP_DSTS_RxFIRSTDESC|TULIP_DSTS_RxLASTDESC)) {
            ms = tulip_dequeue_mbuf(ri, eop, SYNC_RX);
            me = ms;
            ri->ri_free++;
        } else {
            /*
             * If still owned by the TULIP, don't touch it.
             */
            if (DESC_STATUS(eop) & TULIP_DSTS_OWNER)
                break;

            /*
             * It is possible (though improbable unless MCLBYTES < 1518) for
             * a received packet to cross more than one receive descriptor.
             * We first loop through the descriptor ring making sure we have
             * received a complete packet.  If not, we bail until the next
             * interrupt.
             */
            dip = eop;
            while ((DESC_STATUS(eop) & TULIP_DSTS_RxLASTDESC) == 0) {
                if (++eop == ri->ri_last)
                    eop = ri->ri_first;
                TULIP_RXDESC_POSTSYNC(ri);
                if (eop == ri->ri_nextout || (DESC_STATUS(eop) & TULIP_DSTS_OWNER)) {
                    return;
                }
                total_len++;
            }

            /*
             * Dequeue the first buffer for the start of the packet.  Hopefully
             * this will be the only one we need to dequeue.  However, if the
             * packet consumed multiple descriptors, then we need to dequeue
             * those buffers and chain to the starting mbuf.  All buffers but
             * the last buffer have the same length so we can set that now.
             * (we add to last_offset instead of multiplying since we normally
             * won't go into the loop and thereby saving ourselves from
             * doing a multiplication by 0 in the normal case).
             */
            ms = tulip_dequeue_mbuf(ri, dip, SYNC_RX);
            ri->ri_free++;
            for (me = ms; total_len > 0; total_len--) {
                me->m_len = TULIP_RX_BUFLEN;
                last_offset += TULIP_RX_BUFLEN;
                if (++dip == ri->ri_last)
                    dip = ri->ri_first;
                me->m_next = tulip_dequeue_mbuf(ri, dip, SYNC_RX);
                ri->ri_free++;
                me = me->m_next;
            }
            KASSERT(dip == eop, ("mismatched descinfo structs"));
        }

        /*
         *  Now get the size of received packet (minus the CRC).
         */
        total_len = ((DESC_STATUS(eop) >> 16) & 0x7FFF) - ETHER_CRC_LEN;
        if ((sc->tulip_flags & TULIP_RXIGNORE) == 0
            && ((DESC_STATUS(eop) & TULIP_DSTS_ERRSUM) == 0)) {
            me->m_len = total_len - last_offset;
            sc->tulip_flags |= TULIP_RXACT;
            accept = 1;
        } else {
            IFNET_STAT_INC(ifp, ierrors, 1);
            if (DESC_STATUS(eop) & (TULIP_DSTS_RxBADLENGTH|TULIP_DSTS_RxOVERFLOW|TULIP_DSTS_RxWATCHDOG)) {
                sc->tulip_dot3stats.dot3StatsInternalMacReceiveErrors++;
            } else {
                if (DESC_STATUS(eop) & TULIP_DSTS_RxTOOLONG) {
                    sc->tulip_dot3stats.dot3StatsFrameTooLongs++;
                }
                if (DESC_STATUS(eop) & TULIP_DSTS_RxBADCRC) {
                    if (DESC_STATUS(eop) & TULIP_DSTS_RxDRBBLBIT) {
                        sc->tulip_dot3stats.dot3StatsAlignmentErrors++;
                    } else {
                        sc->tulip_dot3stats.dot3StatsFCSErrors++;
                    }
                }
            }
        }
        IFNET_STAT_INC(ifp, ipackets, 1);
        if (++eop == ri->ri_last)
            eop = ri->ri_first;
        ri->ri_nextin = eop;
      queue_mbuf:
        /*
         * We have received a good packet that needs to be passed up the
         * stack.
         */
        if (accept) {
            struct mbuf *m0;

            KASSERT(ms != NULL, ("no packet to accept"));
            /*
             * Update the header for the mbuf referencing this receive
             * buffer and pass it up the stack.  Allocate a new mbuf cluster
             * to replace the one we just passed up the stack.
             *
             * Note that if this packet crossed multiple descriptors
             * we don't even try to reallocate all the mbufs here.
             * Instead we rely on the test at the beginning of
             * the loop to refill for the extra consumed mbufs.
             */
            ms->m_pkthdr.len = total_len;
            ms->m_pkthdr.rcvif = ifp;
            m0 = ms;
            ifp->if_input(ifp, m0, NULL, -1);
            ms = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
        } else if (ms == NULL) {
            /*
             * If we are priming the TULIP with mbufs, then allocate
             * a new cluster for the next descriptor.
             */
            ms = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
        }
        if (ms == NULL) {
            /*
             * Couldn't allocate a new buffer.  Don't bother 
             * trying to replenish the receive queue.
             */
            fillok = 0;
            sc->tulip_flags |= TULIP_RXBUFSLOW;
            continue;
        }
        /*
         * Now give the buffer(s) to the TULIP and save in our
         * receive queue.
         */
        do {
            tulip_descinfo_t * const nextout = ri->ri_nextout;

            M_ASSERTPKTHDR(ms);
            KASSERT(ms->m_data == ms->m_ext.ext_buf,
                ("rx mbuf data doesn't point to cluster"));
            ms->m_len = ms->m_pkthdr.len = TULIP_RX_BUFLEN;
            error = bus_dmamap_load_mbuf(ri->ri_data_tag, *nextout->di_map, ms,
                tulip_dma_map_rxbuf, nextout->di_desc, BUS_DMA_NOWAIT);
            if (error) {
                device_printf(sc->tulip_dev,
                    "unable to load rx map, error = %d\n", error);
                panic("tulip_rx_intr");         /* XXX */
            }
            nextout->di_desc->d_status = TULIP_DSTS_OWNER;
            KASSERT(nextout->di_mbuf == NULL, ("clobbering earlier rx mbuf"));
            nextout->di_mbuf = ms;
            TULIP_RXDESC_POSTSYNC(ri);
            if (++ri->ri_nextout == ri->ri_last)
                ri->ri_nextout = ri->ri_first;
            ri->ri_free--;
            me = ms->m_next;
            ms->m_next = NULL;
        } while ((ms = me) != NULL);

        if ((ri->ri_max - ri->ri_free) >= TULIP_RXQ_TARGET)
            sc->tulip_flags &= ~TULIP_RXBUFSLOW;
    }
}

static int
tulip_tx_intr(tulip_softc_t *sc)
{
    tulip_ringinfo_t *ri = &sc->tulip_txinfo;
    struct mbuf *m;
    int xmits = 0;
    int descs = 0;

    while (ri->ri_free < ri->ri_max) {
        uint32_t d_flag;

        TULIP_TXDESC_POSTSYNC(ri);
        if (DESC_STATUS(ri->ri_nextin) & TULIP_DSTS_OWNER)
            break;

        ri->ri_free++;
        descs++;
        d_flag = DESC_FLAG(ri->ri_nextin);
        if (d_flag & TULIP_DFLAG_TxLASTSEG) {
            if (d_flag & TULIP_DFLAG_TxSETUPPKT) {
                /*
                 * We've just finished processing a setup packet.
                 * Mark that we finished it.  If there's not
                 * another pending, startup the TULIP receiver.
                 * Make sure we ack the RXSTOPPED so we won't get
                 * an abormal interrupt indication.
                 */
                bus_dmamap_sync(sc->tulip_setup_tag, sc->tulip_setup_map,
                    BUS_DMASYNC_POSTWRITE);
                sc->tulip_flags &= ~(TULIP_DOINGSETUP|TULIP_HASHONLY);
                if (DESC_FLAG(ri->ri_nextin) & TULIP_DFLAG_TxINVRSFILT)
                    sc->tulip_flags |= TULIP_HASHONLY;
                if ((sc->tulip_flags & (TULIP_WANTSETUP|TULIP_TXPROBE_ACTIVE)) == 0) {
                    tulip_rx_intr(sc);
                    sc->tulip_cmdmode |= TULIP_CMD_RXRUN;
                    sc->tulip_intrmask |= TULIP_STS_RXSTOPPED;
                    TULIP_CSR_WRITE(sc, csr_status, TULIP_STS_RXSTOPPED);
                    TULIP_CSR_WRITE(sc, csr_intr, sc->tulip_intrmask);
                    TULIP_CSR_WRITE(sc, csr_command, sc->tulip_cmdmode);
                }
            } else {
                const uint32_t d_status = DESC_STATUS(ri->ri_nextin);
                m = tulip_dequeue_mbuf(ri, ri->ri_nextin, SYNC_TX);
                if (m != NULL) {
                    m_freem(m);
                }
                if (sc->tulip_flags & TULIP_TXPROBE_ACTIVE) {
                    tulip_mediapoll_event_t event = TULIP_MEDIAPOLL_TXPROBE_OK;
                    if (d_status & (TULIP_DSTS_TxNOCARR|TULIP_DSTS_TxEXCCOLL)) {
                        event = TULIP_MEDIAPOLL_TXPROBE_FAILED;
                    }
                    (*sc->tulip_boardsw->bd_media_poll)(sc, event);
                    /*
                     * Escape from the loop before media poll has reset the TULIP!
                     */
                    break;
                } else {
                    xmits++;
                    if (d_status & TULIP_DSTS_ERRSUM) {
                        IFNET_STAT_INC(&sc->arpcom.ac_if, oerrors, 1);
                        if (d_status & TULIP_DSTS_TxEXCCOLL)
                            sc->tulip_dot3stats.dot3StatsExcessiveCollisions++;
                        if (d_status & TULIP_DSTS_TxLATECOLL)
                            sc->tulip_dot3stats.dot3StatsLateCollisions++;
                        if (d_status & (TULIP_DSTS_TxNOCARR|TULIP_DSTS_TxCARRLOSS))
                            sc->tulip_dot3stats.dot3StatsCarrierSenseErrors++;
                        if (d_status & (TULIP_DSTS_TxUNDERFLOW|TULIP_DSTS_TxBABBLE))
                            sc->tulip_dot3stats.dot3StatsInternalMacTransmitErrors++;
                        if (d_status & TULIP_DSTS_TxUNDERFLOW)
                            sc->tulip_dot3stats.dot3StatsInternalTransmitUnderflows++;
                        if (d_status & TULIP_DSTS_TxBABBLE)
                            sc->tulip_dot3stats.dot3StatsInternalTransmitBabbles++;
                    } else {
                        u_int32_t collisions = 
                            (d_status & TULIP_DSTS_TxCOLLMASK)
                                >> TULIP_DSTS_V_TxCOLLCNT;
                        IFNET_STAT_INC(&sc->arpcom.ac_if, collisions, collisions);
                        if (collisions == 1)
                            sc->tulip_dot3stats.dot3StatsSingleCollisionFrames++;
                        else if (collisions > 1)
                            sc->tulip_dot3stats.dot3StatsMultipleCollisionFrames++;
                        else if (d_status & TULIP_DSTS_TxDEFERRED)
                            sc->tulip_dot3stats.dot3StatsDeferredTransmissions++;
                        /*
                         * SQE is only valid for 10baseT/BNC/AUI when not
                         * running in full-duplex.  In order to speed up the
                         * test, the corresponding bit in tulip_flags needs to
                         * set as well to get us to count SQE Test Errors.
                         */
                        if (d_status & TULIP_DSTS_TxNOHRTBT & sc->tulip_flags)
                            sc->tulip_dot3stats.dot3StatsSQETestErrors++;
                    }
                }
            }
        }

        if (++ri->ri_nextin == ri->ri_last)
            ri->ri_nextin = ri->ri_first;

        if ((sc->tulip_flags & TULIP_TXPROBE_ACTIVE) == 0)
            ifq_clr_oactive(&sc->arpcom.ac_if.if_snd);
    }
    /*
     * If nothing left to transmit, disable the timer.
     * Else if progress, reset the timer back to 2 ticks.
     */
    if (ri->ri_free == ri->ri_max || (sc->tulip_flags & TULIP_TXPROBE_ACTIVE))
        sc->tulip_txtimer = 0;
    else if (xmits > 0)
        sc->tulip_txtimer = TULIP_TXTIMER;
    IFNET_STAT_INC(&sc->arpcom.ac_if, opackets, xmits);
    return descs;
}

static void
tulip_print_abnormal_interrupt(tulip_softc_t *sc, uint32_t csr)
{
    const char * const *msgp = tulip_status_bits;
    const char *sep;
    uint32_t mask;
    const char thrsh[] = "72|128\0\0\0" "96|256\0\0\0" "128|512\0\0" "160|1024";

    csr &= (1 << (NELEM(tulip_status_bits))) - 1;
    if_printf(&sc->arpcom.ac_if, "abnormal interrupt:");
    for (sep = " ", mask = 1; mask <= csr; mask <<= 1, msgp++) {
        if ((csr & mask) && *msgp != NULL) {
            kprintf("%s%s", sep, *msgp);
            if (mask == TULIP_STS_TXUNDERFLOW && (sc->tulip_flags & TULIP_NEWTXTHRESH)) {
                sc->tulip_flags &= ~TULIP_NEWTXTHRESH;
                if (sc->tulip_cmdmode & TULIP_CMD_STOREFWD) {
                    kprintf(" (switching to store-and-forward mode)");
                } else {
                    kprintf(" (raising TX threshold to %s)",
                           &thrsh[9 * ((sc->tulip_cmdmode & TULIP_CMD_THRESHOLDCTL) >> 14)]);
                }
            }
            sep = ", ";
        }
    }
    kprintf("\n");
}

static void
tulip_intr_handler(tulip_softc_t *sc)
{
    uint32_t csr;

    while ((csr = TULIP_CSR_READ(sc, csr_status)) & sc->tulip_intrmask) {
        TULIP_CSR_WRITE(sc, csr_status, csr);

        if (csr & TULIP_STS_SYSERROR) {
            sc->tulip_last_system_error = (csr & TULIP_STS_ERRORMASK) >> TULIP_STS_ERR_SHIFT;
            if (sc->tulip_flags & TULIP_NOMESSAGES) {
                sc->tulip_flags |= TULIP_SYSTEMERROR;
            } else {
                if_printf(&sc->arpcom.ac_if, "system error: %s\n",
                       tulip_system_errors[sc->tulip_last_system_error]);
            }
            sc->tulip_flags |= TULIP_NEEDRESET;
            sc->tulip_system_errors++;
            break;
        }
        if (csr & (TULIP_STS_LINKPASS|TULIP_STS_LINKFAIL) & sc->tulip_intrmask) {
            if (sc->tulip_boardsw->bd_media_poll != NULL) {
                (*sc->tulip_boardsw->bd_media_poll)(sc, csr & TULIP_STS_LINKFAIL
                                                    ? TULIP_MEDIAPOLL_LINKFAIL
                                                    : TULIP_MEDIAPOLL_LINKPASS);
                csr &= ~TULIP_STS_ABNRMLINTR;
            }
            tulip_media_print(sc);
        }
        if (csr & (TULIP_STS_RXINTR|TULIP_STS_RXNOBUF)) {
            u_int32_t misses = TULIP_CSR_READ(sc, csr_missed_frames);
            if (csr & TULIP_STS_RXNOBUF)
                sc->tulip_dot3stats.dot3StatsMissedFrames += misses & 0xFFFF;
            /*
             * Pass 2.[012] of the 21140A-A[CDE] may hang and/or corrupt data
             * on receive overflows.
             */
            if ((misses & 0x0FFE0000) && (sc->tulip_features & TULIP_HAVE_RXBADOVRFLW)) {
                sc->tulip_dot3stats.dot3StatsInternalMacReceiveErrors++;
                /*
                 * Stop the receiver process and spin until it's stopped.
                 * Tell rx_intr to drop the packets it dequeues.
                 */
                TULIP_CSR_WRITE(sc, csr_command, sc->tulip_cmdmode & ~TULIP_CMD_RXRUN);
                while ((TULIP_CSR_READ(sc, csr_status) & TULIP_STS_RXSTOPPED) == 0)
                    ;
                TULIP_CSR_WRITE(sc, csr_status, TULIP_STS_RXSTOPPED);
                sc->tulip_flags |= TULIP_RXIGNORE;
            }
            tulip_rx_intr(sc);
            if (sc->tulip_flags & TULIP_RXIGNORE) {
                /*
                 * Restart the receiver.
                 */
                sc->tulip_flags &= ~TULIP_RXIGNORE;
                TULIP_CSR_WRITE(sc, csr_command, sc->tulip_cmdmode);
            }
        }
        if (csr & TULIP_STS_ABNRMLINTR) {
            u_int32_t tmp = csr & sc->tulip_intrmask
                & ~(TULIP_STS_NORMALINTR|TULIP_STS_ABNRMLINTR);
            if (csr & TULIP_STS_TXUNDERFLOW) {
                if ((sc->tulip_cmdmode & TULIP_CMD_THRESHOLDCTL) != TULIP_CMD_THRSHLD160) {
                    sc->tulip_cmdmode += TULIP_CMD_THRSHLD96;
                    sc->tulip_flags |= TULIP_NEWTXTHRESH;
                } else if (sc->tulip_features & TULIP_HAVE_STOREFWD) {
                    sc->tulip_cmdmode |= TULIP_CMD_STOREFWD;
                    sc->tulip_flags |= TULIP_NEWTXTHRESH;
                }
            }
            if (sc->tulip_flags & TULIP_NOMESSAGES) {
                sc->tulip_statusbits |= tmp;
            } else {
                tulip_print_abnormal_interrupt(sc, tmp);
                sc->tulip_flags |= TULIP_NOMESSAGES;
            }
            TULIP_CSR_WRITE(sc, csr_command, sc->tulip_cmdmode);
        }
        if (sc->tulip_flags & (TULIP_WANTTXSTART|TULIP_TXPROBE_ACTIVE|TULIP_DOINGSETUP|TULIP_PROMISC)) {
            tulip_tx_intr(sc);
            if ((sc->tulip_flags & TULIP_TXPROBE_ACTIVE) == 0)
                if_devstart(&sc->arpcom.ac_if);
        }
    }
    if (sc->tulip_flags & TULIP_NEEDRESET) {
        tulip_reset(sc);
        tulip_init(sc);
    }
}

static void
tulip_intr_shared(void *arg)
{
    tulip_softc_t *sc;

    for (sc = arg; sc != NULL; sc = sc->tulip_slaves)
        tulip_intr_handler(sc);
}

static void
tulip_intr_normal(void *arg)
{
    tulip_softc_t *sc = (tulip_softc_t *)arg;

    tulip_intr_handler(sc);
}

static struct mbuf *
tulip_txput(tulip_softc_t *sc, struct mbuf *m)
{
    tulip_ringinfo_t * const ri = &sc->tulip_txinfo;
    tulip_descinfo_t *eop, *nextout;
    int segcnt, free;
    uint32_t d_status;
    bus_dma_segment_t segs[TULIP_MAX_TXSEG];
    bus_dmamap_t *map;
    int error, nsegs;
    struct mbuf *m0;

    /*
     * Now we try to fill in our transmit descriptors.  This is
     * a bit reminiscent of going on the Ark two by two
     * since each descriptor for the TULIP can describe
     * two buffers.  So we advance through packet filling
     * each of the two entries at a time to to fill each
     * descriptor.  Clear the first and last segment bits
     * in each descriptor (actually just clear everything
     * but the end-of-ring or chain bits) to make sure
     * we don't get messed up by previously sent packets.
     *
     * We may fail to put the entire packet on the ring if
     * there is either not enough ring entries free or if the
     * packet has more than MAX_TXSEG segments.  In the former
     * case we will just wait for the ring to empty.  In the
     * latter case we have to recopy.
     */
    m0 = m;
    d_status = 0;
    eop = nextout = ri->ri_nextout;
    segcnt = 0;
    free = ri->ri_free;

    /*
     * Reclaim some tx descriptors if we are out since we need at least one
     * free descriptor so that we have a dma_map to load the mbuf.
     */
    if (free == 0) {
        free += tulip_tx_intr(sc);
    }
    if (free == 0) {
        sc->tulip_flags |= TULIP_WANTTXSTART;
        goto finish;
    }
    error = bus_dmamap_load_mbuf_segment(ri->ri_data_tag, *eop->di_map, m, segs,
        1, &nsegs, BUS_DMA_NOWAIT);
    if (error != 0) {
        if (error == EFBIG) {
            /*
             * The packet exceeds the number of transmit buffer
             * entries that we can use for one packet, so we have
             * to recopy it into one mbuf and then try again.  If
             * we can't recopy it, try again later.
             */
            m0 = m_defrag(m, M_NOWAIT);
            if (m0 == NULL) {
                sc->tulip_flags |= TULIP_WANTTXSTART;
                goto finish;
            }
            m = m0;
            error = bus_dmamap_load_mbuf_segment(ri->ri_data_tag, *eop->di_map,
                m, segs, 1, &nsegs, BUS_DMA_NOWAIT);
        }
        if (error != 0) {
            device_printf(sc->tulip_dev,
                "unable to load tx map, error = %d\n", error);
            goto finish;
        }
    }
    /*
     * Each descriptor allows for up to 2 fragments since we don't use
     * the descriptor chaining mode in this driver.
     */
    if ((free -= (nsegs + 1) / 2) <= 0
            /*
             * See if there's any unclaimed space in the transmit ring.
             */
            && (free += tulip_tx_intr(sc)) <= 0) {
        /*
         * There's no more room but since nothing
         * has been committed at this point, just
         * show output is active, put back the
         * mbuf and return.
         */
        sc->tulip_flags |= TULIP_WANTTXSTART;
        bus_dmamap_unload(ri->ri_data_tag, *eop->di_map);
        goto finish;
    }
    for (; nsegs - segcnt > 1; segcnt += 2) {
        eop = nextout;
        eop->di_desc->d_flag   &= TULIP_DFLAG_ENDRING|TULIP_DFLAG_CHAIN;
        eop->di_desc->d_status  = d_status;
        eop->di_desc->d_addr1   = segs[segcnt].ds_addr & 0xffffffff;
        eop->di_desc->d_length1 = segs[segcnt].ds_len;
        eop->di_desc->d_addr2   = segs[segcnt+1].ds_addr & 0xffffffff;
        eop->di_desc->d_length2 = segs[segcnt+1].ds_len;
        d_status = TULIP_DSTS_OWNER;
        if (++nextout == ri->ri_last)
            nextout = ri->ri_first;
    }
    if (segcnt < nsegs) {
        eop = nextout;
        eop->di_desc->d_flag   &= TULIP_DFLAG_ENDRING|TULIP_DFLAG_CHAIN;
        eop->di_desc->d_status  = d_status;
        eop->di_desc->d_addr1   = segs[segcnt].ds_addr & 0xffffffff;
        eop->di_desc->d_length1 = segs[segcnt].ds_len;
        eop->di_desc->d_addr2   = 0;
        eop->di_desc->d_length2 = 0;
        if (++nextout == ri->ri_last)
            nextout = ri->ri_first;
    }

    /*
     * tulip_tx_intr() harvests the mbuf from the last descriptor in the
     * frame.  We just used the dmamap in the first descriptor for the
     * load operation however.  Thus, to let the tulip_dequeue_mbuf() call
     * in tulip_tx_intr() unload the correct dmamap, we swap the dmamap
     * pointers in the two descriptors if this is a multiple-descriptor
     * packet.
     */
    if (eop != ri->ri_nextout) {
            map = eop->di_map;
            eop->di_map = ri->ri_nextout->di_map;
            ri->ri_nextout->di_map = map;
    }

    /*
     * bounce a copy to the bpf listener, if any.
     */
    if (!(sc->tulip_flags & TULIP_DEVICEPROBE))
            BPF_MTAP(&sc->arpcom.ac_if, m);

    /*
     * The descriptors have been filled in.  Now get ready
     * to transmit.
     */
    KASSERT(eop->di_mbuf == NULL, ("clobbering earlier tx mbuf"));
    eop->di_mbuf = m;
    TULIP_TXMAP_PRESYNC(ri, ri->ri_nextout);
    m = NULL;

    /*
     * Make sure the next descriptor after this packet is owned
     * by us since it may have been set up above if we ran out
     * of room in the ring.
     */
    DESC_STATUS(nextout) = 0;
    TULIP_TXDESC_PRESYNC(ri);

    /*
     * Mark the last and first segments, indicate we want a transmit
     * complete interrupt, and tell it to transmit!
     */
    DESC_FLAG(eop) |= TULIP_DFLAG_TxLASTSEG|TULIP_DFLAG_TxWANTINTR;

    /*
     * Note that ri->ri_nextout is still the start of the packet
     * and until we set the OWNER bit, we can still back out of
     * everything we have done.
     */
    DESC_FLAG(ri->ri_nextout) |= TULIP_DFLAG_TxFIRSTSEG;
    TULIP_TXDESC_PRESYNC(ri);
    DESC_STATUS(ri->ri_nextout) = TULIP_DSTS_OWNER;
    TULIP_TXDESC_PRESYNC(ri);

    /*
     * This advances the ring for us.
     */
    ri->ri_nextout = nextout;
    ri->ri_free = free;

    if (sc->tulip_flags & TULIP_TXPROBE_ACTIVE) {
        TULIP_CSR_WRITE(sc, csr_txpoll, 1);
        ifq_set_oactive(&sc->arpcom.ac_if.if_snd);
        return NULL;
    }

    /*
     * switch back to the single queueing ifstart.
     */
    sc->tulip_flags &= ~TULIP_WANTTXSTART;
    if (sc->tulip_txtimer == 0)
        sc->tulip_txtimer = TULIP_TXTIMER;

    /*
     * If we want a txstart, there must be not enough space in the
     * transmit ring.  So we want to enable transmit done interrupts
     * so we can immediately reclaim some space.  When the transmit
     * interrupt is posted, the interrupt handler will call tx_intr
     * to reclaim space and then txstart (since WANTTXSTART is set).
     * txstart will move the packet into the transmit ring and clear
     * WANTTXSTART thereby causing TXINTR to be cleared.
     */
  finish:
    if (sc->tulip_flags & (TULIP_WANTTXSTART|TULIP_DOINGSETUP)) {
        ifq_set_oactive(&sc->arpcom.ac_if.if_snd);
        if ((sc->tulip_intrmask & TULIP_STS_TXINTR) == 0) {
            sc->tulip_intrmask |= TULIP_STS_TXINTR;
            TULIP_CSR_WRITE(sc, csr_intr, sc->tulip_intrmask);
        }
    } else if ((sc->tulip_flags & TULIP_PROMISC) == 0) {
        if (sc->tulip_intrmask & TULIP_STS_TXINTR) {
            sc->tulip_intrmask &= ~TULIP_STS_TXINTR;
            TULIP_CSR_WRITE(sc, csr_intr, sc->tulip_intrmask);
        }
    }
    TULIP_CSR_WRITE(sc, csr_txpoll, 1);
    return m;
}

static void
tulip_txput_setup(tulip_softc_t *sc)
{
    tulip_ringinfo_t *ri = &sc->tulip_txinfo;
    tulip_desc_t *nextout;
        
    /*
     * We will transmit, at most, one setup packet per call to ifstart.
     */

    /*
     * Try to reclaim some free descriptors..
     */
    if (ri->ri_free < 2)
        tulip_tx_intr(sc);
    if ((sc->tulip_flags & TULIP_DOINGSETUP) || ri->ri_free == 1) {
        sc->tulip_flags |= TULIP_WANTTXSTART;
        return;
    }
    bcopy(sc->tulip_setupdata, sc->tulip_setupbuf,
          sizeof(sc->tulip_setupdata));
    /*
     * Clear WANTSETUP and set DOINGSETUP.  Since we know that WANTSETUP is
     * set and DOINGSETUP is clear doing an XOR of the two will DTRT.
     */
    sc->tulip_flags ^= TULIP_WANTSETUP|TULIP_DOINGSETUP;
    ri->ri_free--;
    nextout = ri->ri_nextout->di_desc;
    nextout->d_flag &= TULIP_DFLAG_ENDRING|TULIP_DFLAG_CHAIN;
    nextout->d_flag |= TULIP_DFLAG_TxFIRSTSEG|TULIP_DFLAG_TxLASTSEG
        |TULIP_DFLAG_TxSETUPPKT|TULIP_DFLAG_TxWANTINTR;
    if (sc->tulip_flags & TULIP_WANTHASHPERFECT)
        nextout->d_flag |= TULIP_DFLAG_TxHASHFILT;
    else if (sc->tulip_flags & TULIP_WANTHASHONLY)
        nextout->d_flag |= TULIP_DFLAG_TxHASHFILT|TULIP_DFLAG_TxINVRSFILT;

    nextout->d_length2 = 0;
    nextout->d_addr2 = 0;
    nextout->d_length1 = sizeof(sc->tulip_setupdata);
    nextout->d_addr1 = sc->tulip_setup_dma_addr & 0xffffffff;
    bus_dmamap_sync(sc->tulip_setup_tag, sc->tulip_setup_map,
        BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
    TULIP_TXDESC_PRESYNC(ri);

    /*
     * Advance the ring for the next transmit packet.
     */
    if (++ri->ri_nextout == ri->ri_last)
        ri->ri_nextout = ri->ri_first;

    /*
     * Make sure the next descriptor is owned by us since it
     * may have been set up above if we ran out of room in the
     * ring.
     */
    DESC_STATUS(ri->ri_nextout) = 0;
    TULIP_TXDESC_PRESYNC(ri);
    nextout->d_status = TULIP_DSTS_OWNER;
    /*
     * Flush the ownwership of the current descriptor
     */
    TULIP_TXDESC_PRESYNC(ri);
    TULIP_CSR_WRITE(sc, csr_txpoll, 1);
    if ((sc->tulip_intrmask & TULIP_STS_TXINTR) == 0) {
        sc->tulip_intrmask |= TULIP_STS_TXINTR;
        TULIP_CSR_WRITE(sc, csr_intr, sc->tulip_intrmask);
    }
}

static int
tulip_ifioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred * cr)
{
    tulip_softc_t *sc = (tulip_softc_t *)ifp->if_softc;
    struct ifreq *ifr = (struct ifreq *)data;
    int error = 0;

    switch (cmd) {
        case SIOCGIFADDR: {
            bcopy((caddr_t) sc->arpcom.ac_enaddr,
                  (caddr_t) ((struct sockaddr *)&ifr->ifr_data)->sa_data,
                  ETHER_ADDR_LEN);
            break;
        }

        case SIOCSIFFLAGS: {
            tulip_addr_filter(sc); /* reinit multicast filter */
            tulip_init(sc);
            break;
        }

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

        case SIOCADDMULTI:
        case SIOCDELMULTI: {
            /*
             * Update multicast listeners
             */
            tulip_addr_filter(sc);              /* reset multicast filtering */
            tulip_init(sc);
            error = 0;
            break;
        }

        case SIOCSIFMTU:
            /*
             * Set the interface MTU.
             */
            if (ifr->ifr_mtu > ETHERMTU
                ) {
                error = EINVAL;
                break;
            }
            ifp->if_mtu = ifr->ifr_mtu;
            break;

#ifdef SIOCGADDRROM
        case SIOCGADDRROM: {
            error = copyout(sc->tulip_rombuf, ifr->ifr_data, sizeof(sc->tulip_rombuf));
            break;
        }
#endif
#ifdef SIOCGCHIPID
        case SIOCGCHIPID: {
            ifr->ifr_metric = (int) sc->tulip_chipid;
            break;
        }
#endif
        default: {
            error = ether_ioctl(ifp, cmd, data);
            break;
        }
    }
    return error;
}

static void
tulip_ifinit(void *xsc)
{       
    tulip_softc_t *sc = xsc;

    tulip_addr_filter(sc); /* reinit multicast filter */
    tulip_init(sc);
}

static void
tulip_ifstart(struct ifnet *ifp, struct ifaltq_subque *ifsq)
{
    tulip_softc_t *sc = (tulip_softc_t *)ifp->if_softc;

    ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq);
    if (sc->arpcom.ac_if.if_flags & IFF_RUNNING) {

        if ((sc->tulip_flags & (TULIP_WANTSETUP|TULIP_TXPROBE_ACTIVE)) == TULIP_WANTSETUP)
            tulip_txput_setup(sc);

        while (!ifq_is_empty(&sc->arpcom.ac_if.if_snd)) {
            struct mbuf *m;

            m = ifq_dequeue(&sc->arpcom.ac_if.if_snd);
            if (m == NULL)
                break;

            if ((m = tulip_txput(sc, m)) != NULL) {
                ifq_prepend(&sc->arpcom.ac_if.if_snd, m);
                break;
            }
        }
    }
}

static void
tulip_ifwatchdog(struct ifnet *ifp)
{
    tulip_softc_t * const sc = (tulip_softc_t *)ifp->if_softc;

    sc->arpcom.ac_if.if_timer = 1;
    /*
     * These should be rare so do a bulk test up front so we can just skip
     * them if needed.
     */
    if (sc->tulip_flags & (TULIP_SYSTEMERROR|TULIP_RXBUFSLOW|TULIP_NOMESSAGES)) {
        /*
         * If the number of receive buffer is low, try to refill
         */
        if (sc->tulip_flags & TULIP_RXBUFSLOW)
            tulip_rx_intr(sc);

        if (sc->tulip_flags & TULIP_SYSTEMERROR) {
            if_printf(ifp, "%d system errors: last was %s\n",
                sc->tulip_system_errors,
                tulip_system_errors[sc->tulip_last_system_error]);
        }
        if (sc->tulip_statusbits) {
            tulip_print_abnormal_interrupt(sc, sc->tulip_statusbits);
            sc->tulip_statusbits = 0;
        }

        sc->tulip_flags &= ~(TULIP_NOMESSAGES|TULIP_SYSTEMERROR);
    }

    if (sc->tulip_txtimer)
        tulip_tx_intr(sc);
    if (sc->tulip_txtimer && --sc->tulip_txtimer == 0) {
        if_printf(ifp, "transmission timeout\n");
        if (TULIP_DO_AUTOSENSE(sc)) {
            sc->tulip_media = TULIP_MEDIA_UNKNOWN;
            sc->tulip_probe_state = TULIP_PROBE_INACTIVE;
            sc->tulip_flags &= ~(TULIP_WANTRXACT|TULIP_LINKUP);
        }
        tulip_reset(sc);
        tulip_init(sc);
    }
}

static void
tulip_attach(tulip_softc_t *sc)
{
    struct ifnet *ifp = &sc->arpcom.ac_if;

    ifp->if_flags = IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST;
    ifp->if_init = tulip_ifinit;
    ifp->if_ioctl = tulip_ifioctl;
    ifp->if_start = tulip_ifstart;
    ifp->if_watchdog = tulip_ifwatchdog;
    ifp->if_timer = 1;
  
    if_printf(ifp, "%s%s pass %d.%d%s\n",
           sc->tulip_boardid,
           tulip_chipdescs[sc->tulip_chipid],
           (sc->tulip_revinfo & 0xF0) >> 4,
           sc->tulip_revinfo & 0x0F,
           (sc->tulip_features & (TULIP_HAVE_ISVSROM|TULIP_HAVE_OKSROM))
                 == TULIP_HAVE_ISVSROM ? " (invalid EESPROM checksum)" : "");

    (*sc->tulip_boardsw->bd_media_probe)(sc);
    ifmedia_init(&sc->tulip_ifmedia, 0,
                 tulip_ifmedia_change,
                 tulip_ifmedia_status);
    sc->tulip_flags &= ~TULIP_DEVICEPROBE;
    tulip_ifmedia_add(sc);

    ifq_set_maxlen(&ifp->if_snd, ifqmaxlen);
    ether_ifattach(&sc->arpcom.ac_if, sc->arpcom.ac_enaddr, NULL);

    tulip_reset(sc);
}

/* Release memory for a single descriptor ring. */
static void
tulip_busdma_freering(tulip_ringinfo_t *ri)
{
    int i;

    /* Release the DMA maps and tag for data buffers. */
    if (ri->ri_data_maps != NULL) {
        for (i = 0; i < ri->ri_max; i++) {
            if (ri->ri_data_maps[i] != NULL) {
                bus_dmamap_destroy(ri->ri_data_tag, ri->ri_data_maps[i]);
                ri->ri_data_maps[i] = NULL;
            }
        }
        kfree(ri->ri_data_maps, M_DEVBUF);
        ri->ri_data_maps = NULL;
    }
    if (ri->ri_data_tag != NULL) {
        bus_dma_tag_destroy(ri->ri_data_tag);
        ri->ri_data_tag = NULL;
    }

    /* Release the DMA memory and tag for the ring descriptors. */
    if (ri->ri_dma_addr != 0) {
        bus_dmamap_unload(ri->ri_ring_tag, ri->ri_ring_map);
        ri->ri_dma_addr = 0;
    }
    if (ri->ri_descs != NULL) {
        bus_dmamem_free(ri->ri_ring_tag, ri->ri_descs, ri->ri_ring_map);
        ri->ri_descs = NULL;
    }
    if (ri->ri_ring_tag != NULL) {
        bus_dma_tag_destroy(ri->ri_ring_tag);
        ri->ri_ring_tag = NULL;
    }
}

/* Allocate memory for a single descriptor ring. */
static int
tulip_busdma_allocring(device_t dev, tulip_softc_t *sc, size_t count,
    bus_size_t align, int nsegs, tulip_ringinfo_t *ri, const char *name)
{
    size_t size;
    int error, i;

    /* First, setup a tag. */
    ri->ri_max = count;
    size = count * sizeof(tulip_desc_t);
    error = bus_dma_tag_create(bus_get_dma_tag(dev),
        32, 0, BUS_SPACE_MAXADDR_32BIT,
        BUS_SPACE_MAXADDR, size, 1, size, 0, &ri->ri_ring_tag);
    if (error) {
        device_printf(dev, "failed to allocate %s descriptor ring dma tag\n",
            name);
        return (error);
    }

    /* Next, allocate memory for the descriptors. */
    error = bus_dmamem_alloc(ri->ri_ring_tag, (void **)&ri->ri_descs,
        BUS_DMA_NOWAIT | BUS_DMA_ZERO, &ri->ri_ring_map);
    if (error) {
        device_printf(dev, "failed to allocate memory for %s descriptor ring\n",
            name);
        return (error);
    }

    /* Map the descriptors. */
    error = bus_dmamap_load(ri->ri_ring_tag, ri->ri_ring_map, ri->ri_descs,
        size, tulip_dma_map_addr, &ri->ri_dma_addr, BUS_DMA_NOWAIT);
    if (error) {
        device_printf(dev, "failed to get dma address for %s descriptor ring\n",
            name);
        return (error);
    }

    /* Allocate a tag for the data buffers. */
    error = bus_dma_tag_create(bus_get_dma_tag(dev), align, 0,
        BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
        MCLBYTES * nsegs, nsegs, MCLBYTES, 0, &ri->ri_data_tag);
    if (error) {
        device_printf(dev, "failed to allocate %s buffer dma tag\n", name);
        return (error);
    }

    /* Allocate maps for the data buffers. */
    ri->ri_data_maps = kmalloc(sizeof(bus_dmamap_t) * count, M_DEVBUF,
        M_WAITOK | M_ZERO);
    for (i = 0; i < count; i++) {
        error = bus_dmamap_create(ri->ri_data_tag, 0, &ri->ri_data_maps[i]);
        if (error) {
            device_printf(dev, "failed to create map for %s buffer %d\n",
                name, i);
            return (error);
        }
    }

    return (0);
}

/* Release busdma maps, tags, and memory. */
static void
tulip_busdma_cleanup(tulip_softc_t *sc)
{

    /* Release resources for the setup descriptor. */
    if (sc->tulip_setup_dma_addr != 0) {
        bus_dmamap_unload(sc->tulip_setup_tag, sc->tulip_setup_map);
        sc->tulip_setup_dma_addr = 0;
    }
    if (sc->tulip_setupbuf != NULL) {
        bus_dmamem_free(sc->tulip_setup_tag, sc->tulip_setupbuf,
            sc->tulip_setup_map);
        sc->tulip_setupbuf = NULL;
    }
    if (sc->tulip_setup_tag != NULL) {
        bus_dma_tag_destroy(sc->tulip_setup_tag);
        sc->tulip_setup_tag = NULL;
    }

    /* Release the transmit ring. */
    tulip_busdma_freering(&sc->tulip_txinfo);

    /* Release the receive ring. */
    tulip_busdma_freering(&sc->tulip_rxinfo);
}

static int
tulip_busdma_init(device_t dev, tulip_softc_t *sc)
{
    int error;

    /*
     * Allocate space and dmamap for transmit ring.
     */
    error = tulip_busdma_allocring(dev, sc, TULIP_TXDESCS, 1, TULIP_MAX_TXSEG,
        &sc->tulip_txinfo, "transmit");
    if (error)
        return (error);

    /*
     * Allocate space and dmamap for receive ring.  We tell bus_dma that
     * we can map MCLBYTES so that it will accept a full MCLBYTES cluster,
     * but we will only map the first TULIP_RX_BUFLEN bytes.  This is not
     * a waste in practice though as an ethernet frame can easily fit
     * in TULIP_RX_BUFLEN bytes.
     */
    error = tulip_busdma_allocring(dev, sc, TULIP_RXDESCS, 4, 1,
        &sc->tulip_rxinfo, "receive");
    if (error)
        return (error);

    /*
     * Allocate a DMA tag, memory, and map for setup descriptor
     */
    error = bus_dma_tag_create(bus_get_dma_tag(dev), 32, 0,
        BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR,
        sizeof(sc->tulip_setupdata), 1, sizeof(sc->tulip_setupdata), 0,
        &sc->tulip_setup_tag);
    if (error) {
        device_printf(dev, "failed to allocate setup descriptor dma tag\n");
        return (error);
    }
    error = bus_dmamem_alloc(sc->tulip_setup_tag, (void **)&sc->tulip_setupbuf,
        BUS_DMA_NOWAIT | BUS_DMA_ZERO, &sc->tulip_setup_map);
    if (error) {
        device_printf(dev, "failed to allocate memory for setup descriptor\n");
        return (error);
    }
    error = bus_dmamap_load(sc->tulip_setup_tag, sc->tulip_setup_map,
        sc->tulip_setupbuf, sizeof(sc->tulip_setupdata),
        tulip_dma_map_addr, &sc->tulip_setup_dma_addr, BUS_DMA_NOWAIT);
    if (error) {
        device_printf(dev, "failed to get dma address for setup descriptor\n");
        return (error);
    }

    return error;
}

static void
tulip_initcsrs(tulip_softc_t *sc, tulip_csrptr_t csr_base, size_t csr_size)
{
    sc->tulip_csrs.csr_busmode          = csr_base +  0 * csr_size;
    sc->tulip_csrs.csr_txpoll           = csr_base +  1 * csr_size;
    sc->tulip_csrs.csr_rxpoll           = csr_base +  2 * csr_size;
    sc->tulip_csrs.csr_rxlist           = csr_base +  3 * csr_size;
    sc->tulip_csrs.csr_txlist           = csr_base +  4 * csr_size;
    sc->tulip_csrs.csr_status           = csr_base +  5 * csr_size;
    sc->tulip_csrs.csr_command          = csr_base +  6 * csr_size;
    sc->tulip_csrs.csr_intr             = csr_base +  7 * csr_size;
    sc->tulip_csrs.csr_missed_frames    = csr_base +  8 * csr_size;
    sc->tulip_csrs.csr_9                = csr_base +  9 * csr_size;
    sc->tulip_csrs.csr_10               = csr_base + 10 * csr_size;
    sc->tulip_csrs.csr_11               = csr_base + 11 * csr_size;
    sc->tulip_csrs.csr_12               = csr_base + 12 * csr_size;
    sc->tulip_csrs.csr_13               = csr_base + 13 * csr_size;
    sc->tulip_csrs.csr_14               = csr_base + 14 * csr_size;
    sc->tulip_csrs.csr_15               = csr_base + 15 * csr_size;
}

static int
tulip_initring(tulip_ringinfo_t *ri, int ndescs)
{
    int i;

    ri->ri_descinfo = kmalloc(sizeof(tulip_descinfo_t) * ndescs, M_DEVBUF,
        M_WAITOK | M_ZERO);
    for (i = 0; i < ndescs; i++) {
        ri->ri_descinfo[i].di_desc = &ri->ri_descs[i];
        ri->ri_descinfo[i].di_map = &ri->ri_data_maps[i];
    }
    ri->ri_first = ri->ri_descinfo;
    ri->ri_max = ndescs;
    ri->ri_last = ri->ri_first + ri->ri_max;
    bzero(ri->ri_descs, sizeof(tulip_desc_t) * ri->ri_max);
    DESC_FLAG(&ri->ri_last[-1]) = TULIP_DFLAG_ENDRING;
    return (0);
}

/*
 * This is the PCI configuration support.
 */

#define PCI_CBIO        PCIR_BAR(0)     /* Configuration Base IO Address */
#define PCI_CBMA        PCIR_BAR(1)     /* Configuration Base Memory Address */
#define PCI_CFDA        0x40    /* Configuration Driver Area */

static int
tulip_pci_probe(device_t dev)
{
    const char *name = NULL;

    if (pci_get_vendor(dev) != DEC_VENDORID)
        return ENXIO;

    /*
     * Some LanMedia WAN cards use the Tulip chip, but they have
     * their own driver, and we should not recognize them
     */
    if (pci_get_subvendor(dev) == 0x1376)
        return ENXIO;

    switch (pci_get_device(dev)) {
    case CHIPID_21040:
        name = "Digital 21040 Ethernet";
        break;
    case CHIPID_21041:
        name = "Digital 21041 Ethernet";
        break;
    case CHIPID_21140:
        if (pci_get_revid(dev) >= 0x20)
            name = "Digital 21140A Fast Ethernet";
        else
            name = "Digital 21140 Fast Ethernet";
        break;
    case CHIPID_21142:
        if (pci_get_revid(dev) >= 0x20)
            name = "Digital 21143 Fast Ethernet";
        else
            name = "Digital 21142 Fast Ethernet";
        break;
    }
    if (name) {
        device_set_desc(dev, name);
        return -200;
    }
    return ENXIO;
}

static int
tulip_shutdown(device_t dev)
{
    tulip_softc_t *sc = device_get_softc(dev);

    lwkt_serialize_enter(sc->arpcom.ac_if.if_serializer);
    TULIP_CSR_WRITE(sc, csr_busmode, TULIP_BUSMODE_SWRESET);
    DELAY(10);  /* Wait 10 microseconds (actually 50 PCI cycles but at 
                   33MHz that comes to two microseconds but wait a
                   bit longer anyways) */
    lwkt_serialize_exit(sc->arpcom.ac_if.if_serializer);
    return 0;
}

static int
tulip_pci_attach(device_t dev)
{
    tulip_softc_t *sc;
    int retval, idx;
    uint32_t revinfo, cfdainfo;
    u_int csroffset = TULIP_PCI_CSROFFSET;
    u_int csrsize = TULIP_PCI_CSRSIZE;
    tulip_csrptr_t csr_base;
    tulip_chipid_t chipid = TULIP_CHIPID_UNKNOWN;
    struct resource *res;
    int rid, unit;

    unit = device_get_unit(dev);

    if (unit >= TULIP_MAX_DEVICES) {
        device_printf(dev, "not configured; limit of %d reached or exceeded\n",
               TULIP_MAX_DEVICES);
        return ENXIO;
    }

    revinfo  = pci_get_revid(dev);
    cfdainfo = pci_read_config(dev, PCI_CFDA, 4);

    /* turn busmaster on in case BIOS doesn't set it */
    pci_enable_busmaster(dev);

    if (pci_get_vendor(dev) == DEC_VENDORID) {
        if (pci_get_device(dev) == CHIPID_21040)
                chipid = TULIP_21040;
        else if (pci_get_device(dev) == CHIPID_21041)
                chipid = TULIP_21041;
        else if (pci_get_device(dev) == CHIPID_21140)
                chipid = (revinfo >= 0x20) ? TULIP_21140A : TULIP_21140;
        else if (pci_get_device(dev) == CHIPID_21142)
                chipid = (revinfo >= 0x20) ? TULIP_21143 : TULIP_21142;
    }
    if (chipid == TULIP_CHIPID_UNKNOWN)
        return ENXIO;

    if (chipid == TULIP_21040 && revinfo < 0x20) {
        device_printf(dev,
            "not configured; 21040 pass 2.0 required (%d.%d found)\n",
            revinfo >> 4, revinfo & 0x0f);
        return ENXIO;
    } else if (chipid == TULIP_21140 && revinfo < 0x11) {
        device_printf(dev,
            "not configured; 21140 pass 1.1 required (%d.%d found)\n",
            revinfo >> 4, revinfo & 0x0f);
        return ENXIO;
    }

    sc = device_get_softc(dev);
    sc->tulip_dev = dev;
    sc->tulip_pci_busno = pci_get_bus(dev);
    sc->tulip_pci_devno = pci_get_slot(dev);
    sc->tulip_chipid = chipid;
    sc->tulip_flags |= TULIP_DEVICEPROBE;
    if (chipid == TULIP_21140 || chipid == TULIP_21140A)
        sc->tulip_features |= TULIP_HAVE_GPR|TULIP_HAVE_STOREFWD;
    if (chipid == TULIP_21140A && revinfo <= 0x22)
        sc->tulip_features |= TULIP_HAVE_RXBADOVRFLW;
    if (chipid == TULIP_21140)
        sc->tulip_features |= TULIP_HAVE_BROKEN_HASH;
    if (chipid != TULIP_21040 && chipid != TULIP_21140)
        sc->tulip_features |= TULIP_HAVE_POWERMGMT;
    if (chipid == TULIP_21041 || chipid == TULIP_21142 || chipid == TULIP_21143) {
        sc->tulip_features |= TULIP_HAVE_DUALSENSE;
        if (chipid != TULIP_21041 || revinfo >= 0x20)
            sc->tulip_features |= TULIP_HAVE_SIANWAY;
        if (chipid != TULIP_21041)
            sc->tulip_features |= TULIP_HAVE_SIAGP|TULIP_HAVE_RXBADOVRFLW|TULIP_HAVE_STOREFWD;
        if (chipid != TULIP_21041 && revinfo >= 0x20)
            sc->tulip_features |= TULIP_HAVE_SIA100;
    }

    if (sc->tulip_features & TULIP_HAVE_POWERMGMT
            && (cfdainfo & (TULIP_CFDA_SLEEP|TULIP_CFDA_SNOOZE))) {
        cfdainfo &= ~(TULIP_CFDA_SLEEP|TULIP_CFDA_SNOOZE);
        pci_write_config(dev, PCI_CFDA, cfdainfo, 4);
        DELAY(11*1000);
    }
    if_initname(&sc->arpcom.ac_if, device_get_name(dev), unit);
    sc->tulip_unit = unit;
    sc->tulip_revinfo = revinfo;
    sc->arpcom.ac_if.if_softc = sc;
#if defined(TULIP_IOMAPPED)
    rid = PCI_CBIO;
    res = bus_alloc_resource_any(dev, SYS_RES_IOPORT, &rid, RF_ACTIVE);
#else
    rid = PCI_CBMA;
    res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
#endif
    if (!res)
        return ENXIO;
    sc->tulip_csrs_bst = rman_get_bustag(res);
    sc->tulip_csrs_bsh = rman_get_bushandle(res);
    csr_base = 0;

    callout_init(&sc->tulip_callout);
    tulips[unit] = sc;

    tulip_initcsrs(sc, csr_base + csroffset, csrsize);

    if ((retval = tulip_busdma_init(dev, sc)) != 0) {
        device_printf(dev, "error initing bus_dma: %d\n", retval);
        tulip_busdma_cleanup(sc);
        return ENXIO;
    }

    retval = tulip_initring(&sc->tulip_rxinfo, TULIP_RXDESCS);
    if (retval == 0)
        retval = tulip_initring(&sc->tulip_txinfo, TULIP_TXDESCS);
    if (retval) {
        tulip_busdma_cleanup(sc);
        return retval;
    }

    /*
     * Make sure there won't be any interrupts or such...
     */
    TULIP_CSR_WRITE(sc, csr_busmode, TULIP_BUSMODE_SWRESET);
    DELAY(100); /* Wait 10 microseconds (actually 50 PCI cycles but at 
                   33MHz that comes to two microseconds but wait a
                   bit longer anyways) */

    if ((retval = tulip_read_macaddr(sc)) < 0) {
        device_printf(dev, "can't read ENET ROM (why=%d) (", retval);
        for (idx = 0; idx < 32; idx++)
            kprintf("%02x", sc->tulip_rombuf[idx]);
        kprintf("\n");
        device_printf(dev, "%s%s pass %d.%d\n",
               sc->tulip_boardid, tulip_chipdescs[sc->tulip_chipid],
               (sc->tulip_revinfo & 0xF0) >> 4, sc->tulip_revinfo & 0x0F);
        device_printf(dev, "address unknown\n");
    } else {
        void (*intr_rtn)(void *) = tulip_intr_normal;

        if (sc->tulip_features & TULIP_HAVE_SHAREDINTR)
            intr_rtn = tulip_intr_shared;

        tulip_attach(sc);

        /* Setup interrupt last. */
        if ((sc->tulip_features & TULIP_HAVE_SLAVEDINTR) == 0) {
            void *ih;

            rid = 0;
            res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
                                         RF_SHAREABLE | RF_ACTIVE);
            if (res == NULL || bus_setup_intr(dev, res, INTR_MPSAFE,
                                           intr_rtn, sc, &ih,
                                           sc->arpcom.ac_if.if_serializer)) {
                device_printf(dev, "couldn't map interrupt\n");
                ifmedia_removeall(&sc->tulip_ifmedia);
                ether_ifdetach(&sc->arpcom.ac_if);
                tulip_busdma_cleanup(sc);
                return ENXIO;
            }

            ifq_set_cpuid(&sc->arpcom.ac_if.if_snd, rman_get_cpuid(res));
        }
    }
    return 0;
}

static device_method_t tulip_pci_methods[] = {
    /* Device interface */
    DEVMETHOD(device_probe,     tulip_pci_probe),
    DEVMETHOD(device_attach,    tulip_pci_attach),
    DEVMETHOD(device_shutdown,  tulip_shutdown),
    DEVMETHOD_END
};
static driver_t tulip_pci_driver = {
    "de",
    tulip_pci_methods,
    sizeof(tulip_softc_t),
};
static devclass_t tulip_devclass;

DECLARE_DUMMY_MODULE(if_de);
DRIVER_MODULE(if_de, pci, tulip_pci_driver, tulip_devclass, NULL, NULL);