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if_de.c

/*    $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: src/sys/pci/if_de.c,v 1.162.2.6 2005/11/28 19:43:57 jhb Exp $");

#define     TULIP_HDR_DATA

#include "opt_ddb.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/endian.h>
#include <sys/ktr.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/eventhandler.h>
#include <machine/bus.h>
#include <machine/bus_dma.h>
#include <machine/resource.h>
#include <sys/bus.h>
#include <sys/rman.h>

#include <net/if.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/if_media.h>
#include <net/if_types.h>
#include <net/if_dl.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 <dev/pci/pcivar.h>
#include <dev/pci/pcireg.h>
#include <pci/dc21040reg.h>

#ifdef DDB
#include <ddb/ddb.h>
#endif

/*
 * Intel CPUs should use I/O mapped access.
 */
#if defined(__i386__)
#define     TULIP_IOMAPPED
#endif

#if 0
/* This enables KTR traces at KTR_DEV. */
#define     KTR_TULIP   KTR_DEV
#else
#define     KTR_TULIP   0
#endif

#if 0
/*
 * This turns on all sort of debugging stuff and make the
 * driver much larger.
 */
#define TULIP_DEBUG
#endif

#if 0
#define     TULIP_PERFSTATS
#endif

#define     TULIP_HZ    10

#include <pci/if_devar.h>

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

/*
 * 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_addr_filter(tulip_softc_t * const sc);
static int  tulip_ifmedia_change(struct ifnet * const ifp);
static void tulip_ifmedia_status(struct ifnet * const ifp,
                struct ifmediareq *req);
static void tulip_init(void *);
static void tulip_init_locked(tulip_softc_t * const sc);
static void tulip_intr_shared(void *arg);
static void tulip_intr_normal(void *arg);
static void tulip_mii_autonegotiate(tulip_softc_t * const sc,
                const unsigned phyaddr);
static int  tulip_mii_map_abilities(tulip_softc_t * const sc,
                unsigned abilities);
static tulip_media_t
            tulip_mii_phy_readspecific(tulip_softc_t * const sc);
static unsigned   tulip_mii_readreg(tulip_softc_t * const sc, unsigned devaddr,
                unsigned regno);
static void tulip_mii_writereg(tulip_softc_t * const sc, unsigned devaddr,
                unsigned regno, unsigned data);
static void tulip_reset(tulip_softc_t * const sc);
static void tulip_rx_intr(tulip_softc_t * const sc);
static int  tulip_srom_decode(tulip_softc_t * const sc);
static void tulip_start(struct ifnet *ifp);
static void tulip_start_locked(tulip_softc_t * const sc);
static struct mbuf *
            tulip_txput(tulip_softc_t * const sc, struct mbuf *m);
static void tulip_txput_setup(tulip_softc_t * const sc);
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_dma_map_addr(void *arg, bus_dma_segment_t *segs, int nseg, int error)
{
    u_int32_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;
    desc->d_length1 = TULIP_RX_BUFLEN;
#ifdef not_needed
    /* These should already always be zero. */
    desc->d_addr2 = 0;
    desc->d_length2 = 0;
#endif
}

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 * const sc = arg;

    TULIP_PERFSTART(timeout)
    TULIP_LOCK_ASSERT(sc);

    sc->tulip_flags &= ~TULIP_TIMEOUTPENDING;
    sc->tulip_probe_timeout -= 1000 / TULIP_HZ;
    (sc->tulip_boardsw->bd_media_poll)(sc, TULIP_MEDIAPOLL_TIMER);

    TULIP_PERFEND(timeout);
}

static void
tulip_timeout(tulip_softc_t * const sc)
{
    TULIP_LOCK_ASSERT(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 * const 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.
     */
    TULIP_LOCK_ASSERT(sc);
    MGETHDR(m, M_DONTWAIT, MT_DATA);
    if (m == NULL)
      return 0;
    /*
     * Construct a LLC TEST message which will point to ourselves.
     */
    bcopy(IFP2ENADDR(sc->tulip_ifp), mtod(m, struct ether_header *)->ether_dhost, 6);
    bcopy(IFP2ENADDR(sc->tulip_ifp), mtod(m, struct ether_header *)->ether_shost, 6);
    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 * const sc, tulip_media_t media)
{
    const tulip_media_info_t *mi = sc->tulip_mediums[media];

    TULIP_LOCK_ASSERT(sc);
    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 * const sc, tulip_media_t media)
{
    TULIP_LOCK_ASSERT(sc);
    if ((sc->tulip_flags & TULIP_LINKUP) == 0)
      sc->tulip_flags |= TULIP_PRINTLINKUP;
    sc->tulip_flags |= TULIP_LINKUP;
    sc->tulip_ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
#if 0 /* XXX how does with work with ifmedia? */
    if ((sc->tulip_flags & TULIP_DIDNWAY) == 0) {
      if (sc->tulip_ifp->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) {
#ifdef TULIP_DEBUG
      sc->tulip_dbg.dbg_last_media = sc->tulip_media;
#endif
      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_locked(sc);
}

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

    TULIP_LOCK_ASSERT(sc);
    if ((sc->tulip_flags & TULIP_LINKUP) == 0)
      return;
    if (sc->tulip_flags & TULIP_PRINTMEDIA) {
      if_printf(ifp, "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(ifp, "link up\n");
      sc->tulip_flags &= ~TULIP_PRINTLINKUP;
    }
}

#if defined(TULIP_DO_GPR_SENSE)
static tulip_media_t
tulip_21140_gpr_media_sense(tulip_softc_t * const sc)
{
    struct ifnet *ifp sc->tulip_ifp;
    tulip_media_t maybe_media = TULIP_MEDIA_UNKNOWN;
    tulip_media_t last_media = TULIP_MEDIA_UNKNOWN;
    tulip_media_t media;

    TULIP_LOCK_ASSERT(sc);

    /*
     * If one of the media blocks contained a default media flag,
     * use that.
     */
    for (media = TULIP_MEDIA_UNKNOWN; media < TULIP_MEDIA_MAX; media++) {
      const tulip_media_info_t *mi;
      /*
       * Media is not supported (or is full-duplex).
       */
      if ((mi = sc->tulip_mediums[media]) == NULL || TULIP_IS_MEDIA_FD(media))
          continue;
      if (mi->mi_type != TULIP_MEDIAINFO_GPR)
          continue;

      /*
       * Remember the media is this is the "default" media.
       */
      if (mi->mi_default && maybe_media == TULIP_MEDIA_UNKNOWN)
          maybe_media = media;

      /*
       * No activity mask?  Can't see if it is active if there's no mask.
       */
      if (mi->mi_actmask == 0)
          continue;

      /*
       * Does the activity data match?
       */
      if ((TULIP_CSR_READ(sc, csr_gp) & mi->mi_actmask) != mi->mi_actdata)
          continue;

#if defined(TULIP_DEBUG)
      if_printf(ifp, "gpr_media_sense: %s: 0x%02x & 0x%02x == 0x%02x\n",
             tulip_mediums[media],
             TULIP_CSR_READ(sc, csr_gp) & 0xFF,
             mi->mi_actmask, mi->mi_actdata);
#endif
      /*
       * It does!  If this is the first media we detected, then 
       * remember this media.  If isn't the first, then there were
       * multiple matches which we equate to no match (since we don't
       * which to select (if any).
       */
      if (last_media == TULIP_MEDIA_UNKNOWN) {
          last_media = media;
      } else if (last_media != media) {
          last_media = TULIP_MEDIA_UNKNOWN;
      }
    }
    return (last_media != TULIP_MEDIA_UNKNOWN) ? last_media : maybe_media;
}
#endif /* TULIP_DO_GPR_SENSE */

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

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


    /*
     * 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 defined(TULIP_DEBUG)
            loudprintf("%s(phy%d): autonegotiation changed: 0x%04x -> 0x%04x\n",
                     ifp->if_xname, sc->tulip_phyaddr,
                     sc->tulip_abilities, abilities);
#endif
            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;
#if defined(TULIP_DEBUG)
      if (sc->tulip_probe_timeout <= 0)
          if_printf(ifp, "sia status = 0x%08x\n",
                TULIP_CSR_READ(sc, csr_sia_status));
#endif
    } 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(ifp, "link down: cable problem?\n");
    }
#if defined(TULIP_DEBUG)
    sc->tulip_dbg.dbg_link_downed++;
#endif
    return TULIP_LINK_DOWN;
}

static void
tulip_media_poll(tulip_softc_t * const sc, tulip_mediapoll_event_t event)
{
    struct ifnet *ifp = sc->tulip_ifp;

    TULIP_LOCK_ASSERT(sc);
#if defined(TULIP_DEBUG)
    sc->tulip_dbg.dbg_events[event]++;
#endif
    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)) {
#if defined(TULIP_DEBUG)
            sc->tulip_dbg.dbg_link_failures++;
#endif
            sc->tulip_media = TULIP_MEDIA_UNKNOWN;
            if (sc->tulip_ifp->if_flags & IFF_UP)
                tulip_reset(sc);    /* restart probe */
          }
          return;
      }
#if defined(TULIP_DEBUG)
      sc->tulip_dbg.dbg_link_pollintrs++;
#endif
    }

    if (event == TULIP_MEDIAPOLL_START) {
      sc->tulip_ifp->if_drv_flags |= IFF_DRV_OACTIVE;
      if (sc->tulip_probe_state != TULIP_PROBE_INACTIVE)
          return;
      sc->tulip_probe_mediamask = 0;
      sc->tulip_probe_passes = 0;
#if defined(TULIP_DEBUG)
      sc->tulip_dbg.dbg_media_probes++;
#endif
      /*
       * 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;
#if defined(TULIP_DEBUG)
      } else {
          sc->tulip_dbg.dbg_txprobes_ok[sc->tulip_probe_media]++;
#endif
      }
      tulip_linkup(sc, sc->tulip_probe_media);
      tulip_timeout(sc);
      return;
    }

    if (sc->tulip_probe_state == TULIP_PROBE_GPRTEST) {
#if defined(TULIP_DO_GPR_SENSE)
      /*
       * Check for media via the general purpose register.
       *
       * Try to sense the media via the GPR.  If the same value
       * occurs 3 times in a row then just use that.
       */
      if (sc->tulip_probe_timeout > 0) {
          tulip_media_t new_probe_media = tulip_21140_gpr_media_sense(sc);
#if defined(TULIP_DEBUG)
          if_printf(ifp, "media_poll: gpr sensing = %s\n",
               tulip_mediums[new_probe_media]);
#endif
          if (new_probe_media != TULIP_MEDIA_UNKNOWN) {
            if (new_probe_media == sc->tulip_probe_media) {
                if (--sc->tulip_probe_count == 0)
                  tulip_linkup(sc, sc->tulip_probe_media);
            } else {
                sc->tulip_probe_count = 10;
            }
          }
          sc->tulip_probe_media = new_probe_media;
          tulip_timeout(sc);
          return;
      }
#endif /* TULIP_DO_GPR_SENSE */
      /*
       * 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) || defined(TULIP_DEBUG)
            panic("tulip_media_poll: botch at line %d\n", __LINE__);
#endif
            break;
          }
      }
    }

    if (event == TULIP_MEDIAPOLL_TXPROBE_FAILED) {
#if defined(TULIP_DEBUG)
      sc->tulip_dbg.dbg_txprobes_failed[sc->tulip_probe_media]++;
#endif
      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) {
#if defined(TULIP_DEBUG)
      if (sc->tulip_probe_media == TULIP_MEDIA_UNKNOWN) {
          if_printf(ifp, "poll media unknown!\n");
          sc->tulip_probe_media = TULIP_MEDIA_MAX;
      }
#endif
      /*
       * 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(ifp, "autosense failed: cable problem?\n");
                if ((sc->tulip_ifp->if_flags & IFF_UP) == 0) {
                  sc->tulip_ifp->if_drv_flags &= ~IFF_DRV_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));

#if defined(TULIP_DEBUG)
      if_printf(ifp, "%s: probing %s\n",
             event == TULIP_MEDIAPOLL_TXPROBE_FAILED ? "txprobe failed" : "timeout",
             tulip_mediums[sc->tulip_probe_media]);
#endif
      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 * const sc)
{
    TULIP_LOCK_ASSERT(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 * const sc, tulip_media_t media)
{
    TULIP_LOCK_ASSERT(sc);
    sc->tulip_cmdmode |= TULIP_CMD_CAPTREFFCT|TULIP_CMD_THRSHLD160
      |TULIP_CMD_BACKOFFCTR;
    sc->tulip_ifp->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 * const sc)
{
    TULIP_LOCK_ASSERT(sc);
    tulip_21040_mediainfo_init(sc, TULIP_MEDIA_UNKNOWN);
    return;
}

static void
tulip_21040_10baset_only_media_probe(tulip_softc_t * const sc)
{
    TULIP_LOCK_ASSERT(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 * const sc)
{
    TULIP_LOCK_ASSERT(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 * const sc)
{
    TULIP_LOCK_ASSERT(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 * const sc)
{
    TULIP_LOCK_ASSERT(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 * const sc)
{
    tulip_media_info_t * const mi = sc->tulip_mediainfo;

    TULIP_LOCK_ASSERT(sc);
#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 * const sc)
{
    TULIP_LOCK_ASSERT(sc);
    sc->tulip_ifp->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 * const sc,
    const tulip_mediapoll_event_t event)
{
    u_int32_t sia_status;

    TULIP_LOCK_ASSERT(sc);
#if defined(TULIP_DEBUG)
    sc->tulip_dbg.dbg_events[event]++;
#endif

    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) {
      sc->tulip_ifp->if_drv_flags |= IFF_DRV_OACTIVE;
      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) {
#if defined(TULIP_DEBUG)
      sc->tulip_dbg.dbg_txprobes_ok[sc->tulip_probe_media]++;
#endif
      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->tulip_ifp,
                "autosense failed: cable problem?\n");
            if ((sc->tulip_ifp->if_flags & IFF_UP) == 0) {
                sc->tulip_ifp->if_drv_flags &= ~IFF_DRV_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 */
      },
#if defined(TULIP_DEBUG)
      "NS DP83840",
#endif
    },
    { 0x0281F400, 0,          /* 00-A0-7D */
      {
      { 0x12, 0x0010, 0x0000 },     /* 10T */
      { },                    /* 100TX */
      { 0x12, 0x0010, 0x0010 },     /* 100T4 */
      { 0x12, 0x0008, 0x0008 },     /* FULL_DUPLEX */
      },
#if defined(TULIP_DEBUG)
      "Seeq 80C240"
#endif
    },
#if 0
    { 0x0015F420, 0,    /* 00-A0-7D */
      {
      { 0x12, 0x0010, 0x0000 },     /* 10T */
      { },                    /* 100TX */
      { 0x12, 0x0010, 0x0010 },     /* 100T4 */
      { 0x12, 0x0008, 0x0008 },     /* FULL_DUPLEX */
      },
#if defined(TULIP_DEBUG)
      "Broadcom BCM5000"
#endif
    },
#endif
    { 0x0281F400, 0,          /* 00-A0-BE */
      {
      { 0x11, 0x8000, 0x0000 },     /* 10T */
      { 0x11, 0x8000, 0x8000 },     /* 100TX */
      { },                    /* 100T4 */
      { 0x11, 0x4000, 0x4000 },     /* FULL_DUPLEX */
      },
#if defined(TULIP_DEBUG)
      "ICS 1890"
#endif 
    },
    { 0 }
};

static tulip_media_t
tulip_mii_phy_readspecific(tulip_softc_t * const 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
    };

    TULIP_LOCK_ASSERT(sc);

    /*
     * 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 * const 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 * const 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 * const 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 * const 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 unsigned
tulip_mii_get_phyaddr(tulip_softc_t * const sc, unsigned offset)
{
    unsigned phyaddr;

    TULIP_LOCK_ASSERT(sc);
    for (phyaddr = 1; phyaddr < 32; phyaddr++) {
      unsigned 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) {
      unsigned 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 * const sc, unsigned abilities)
{
    TULIP_LOCK_ASSERT(sc);
    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 * const sc, const unsigned phyaddr)
{
    struct ifnet *ifp = sc->tulip_ifp;

    TULIP_LOCK_ASSERT(sc);
    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;
      }
        /* FALLTHROUGH */
        case TULIP_PROBE_PHYRESET: {
          u_int32_t status;
          u_int32_t data = tulip_mii_readreg(sc, phyaddr, PHYREG_CONTROL);
          if (data & PHYCTL_RESET) {
            if (sc->tulip_probe_timeout > 0) {
                tulip_timeout(sc);
                return;
            }
            printf("%s(phy%d): error: reset of PHY never completed!\n",
                     ifp->if_xname, phyaddr);
            sc->tulip_flags &= ~TULIP_TXPROBE_ACTIVE;
            sc->tulip_probe_state = TULIP_PROBE_FAILED;
            sc->tulip_ifp->if_flags &= ~IFF_UP;
            sc->tulip_ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
            return;
          }
          status = tulip_mii_readreg(sc, phyaddr, PHYREG_STATUS);
          if ((status & PHYSTS_CAN_AUTONEG) == 0) {
#if defined(TULIP_DEBUG)
            loudprintf("%s(phy%d): autonegotiation disabled\n",
                     ifp->if_xname, phyaddr);
#endif
            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);
#if defined(TULIP_DEBUG)
          if ((data & PHYCTL_AUTONEG_ENABLE) == 0)
            loudprintf("%s(phy%d): oops: enable autonegotiation failed: 0x%04x\n",
                     ifp->if_xname, phyaddr, data);
          else
            loudprintf("%s(phy%d): autonegotiation restarted: 0x%04x\n",
                     ifp->if_xname, phyaddr, data);
          sc->tulip_dbg.dbg_nway_starts++;
#endif
          sc->tulip_probe_state = TULIP_PROBE_PHYAUTONEG;
          sc->tulip_probe_timeout = 3000;
      }
        /* FALLTHROUGH */
        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;
            }
#if defined(TULIP_DEBUG)
            loudprintf("%s(phy%d): autonegotiation timeout: sts=0x%04x, ctl=0x%04x\n",
                     ifp->if_xname, phyaddr, status,
                     tulip_mii_readreg(sc, phyaddr, PHYREG_CONTROL));
#endif
            sc->tulip_flags &= ~TULIP_DIDNWAY;
            sc->tulip_probe_state = TULIP_PROBE_MEDIATEST;
            return;
          }
          data = tulip_mii_readreg(sc, phyaddr, PHYREG_AUTONEG_ABILITIES);
#if defined(TULIP_DEBUG)
          loudprintf("%s(phy%d): autonegotiation complete: 0x%04x\n",
                   ifp->if_xname, phyaddr, data);
#endif
          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\n", __LINE__);
#endif
          break;
      }
    }
#if defined(TULIP_DEBUG)
    loudprintf("%s(phy%d): autonegotiation failure: state = %d\n",
             ifp->if_xname, phyaddr, sc->tulip_probe_state);
          sc->tulip_dbg.dbg_nway_failures++;
#endif
}

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

    TULIP_LOCK_ASSERT(sc);
    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) {
#if defined(TULIP_DEBUG)
      if (media < TULIP_MEDIA_MAX && sc->tulip_mediums[media] != NULL) {
#endif
          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);
          }
#if defined(TULIP_DEBUG)
      } else {
          if_printf(sc->tulip_ifp, "preset: bad media %d!\n", media);
      }
#endif
    }
    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->tulip_ifp->if_baudrate = 10000000;
          sc->tulip_flags |= TULIP_SQETEST;
          break;
      }
      case TULIP_MEDIA_10BASET_FD: {
          sc->tulip_cmdmode |= TULIP_CMD_FULLDUPLEX|TULIP_CMD_TXTHRSHLDCTL;
          sc->tulip_ifp->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->tulip_ifp->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->tulip_ifp->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 * const sc, tulip_mediapoll_event_t event)
{
#if defined(TULIP_DEBUG)
    sc->tulip_dbg.dbg_events[event]++;
#endif
#if defined(DIAGNOSTIC)
    if_printf(sc->tulip_ifp, "botch(media_poll) at line %d\n", __LINE__);
#endif
}

__inline static void
tulip_21140_mediainit(tulip_softc_t * const sc, tulip_media_info_t * const mip,
    tulip_media_t const media, unsigned gpdata, unsigned cmdmode)
{
    TULIP_LOCK_ASSERT(sc);
    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 * const sc)
{
    tulip_media_info_t *mip = sc->tulip_mediainfo;

    TULIP_LOCK_ASSERT(sc);
    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 * const sc)
{
    tulip_media_info_t *mip = sc->tulip_mediainfo;
    unsigned gpdata;

    TULIP_LOCK_ASSERT(sc);
    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 * const sc)
{
    tulip_media_info_t *mip = sc->tulip_mediainfo;
    int idx, cnt = 0;

    TULIP_LOCK_ASSERT(sc);
    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 * const sc)
{
    tulip_media_info_t *mip = sc->tulip_mediainfo;
    u_int32_t cmdmode = TULIP_CSR_READ(sc, csr_command);

    TULIP_LOCK_ASSERT(sc);
    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 * const sc)
{
    tulip_media_info_t *mip = sc->tulip_mediainfo;
    int cnt10 = 0, cnt100 = 0, idx;

    TULIP_LOCK_ASSERT(sc);
    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--) {
      u_int32_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 * const sc)
{
    TULIP_LOCK_ASSERT(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 * const sc)
{
    unsigned 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 * const sc)
{   
    unsigned idx; 
    const unsigned bitwidth = SROM_BITWIDTH;
    const unsigned cmdmask = (SROMCMD_RD << bitwidth);
    const unsigned msb = 1 << (bitwidth + 3 - 1);
    unsigned lastidx = (1 << bitwidth) - 1;

    tulip_srom_idle(sc);

    for (idx = 0; idx <= lastidx; idx++) {
        unsigned 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) {
            const unsigned 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 * const sc, unsigned data, unsigned bits)
{
    unsigned msb = 1 << (bits - 1);
    unsigned csr = TULIP_CSR_READ(sc, csr_srom_mii) & (MII_RD|MII_DOUT|MII_CLK);
    unsigned lastbit = (csr & MII_DOUT) ? msb : 0;

    TULIP_LOCK_ASSERT(sc);
    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 * const sc, unsigned cmd)
{
    unsigned csr = TULIP_CSR_READ(sc, csr_srom_mii) & (MII_RD|MII_DOUT|MII_CLK);

    TULIP_LOCK_ASSERT(sc);
    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 unsigned
tulip_mii_readbits(tulip_softc_t * const sc)
{
    unsigned data;
    unsigned csr = TULIP_CSR_READ(sc, csr_srom_mii) & (MII_RD|MII_DOUT|MII_CLK);
    int idx;

    TULIP_LOCK_ASSERT(sc);
    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 unsigned
tulip_mii_readreg(tulip_softc_t * const sc, unsigned devaddr, unsigned regno)
{
    unsigned csr = TULIP_CSR_READ(sc, csr_srom_mii) & (MII_RD|MII_DOUT|MII_CLK);
    unsigned data;

    TULIP_LOCK_ASSERT(sc);
    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);
#if defined(TULIP_DEBUG)
    sc->tulip_dbg.dbg_phyregs[regno][0] = data;
    sc->tulip_dbg.dbg_phyregs[regno][1]++;
#endif
    return data;
}

static void
tulip_mii_writereg(tulip_softc_t * const sc, unsigned devaddr, unsigned regno,
    unsigned data)
{
    unsigned csr = TULIP_CSR_READ(sc, csr_srom_mii) & (MII_RD|MII_DOUT|MII_CLK);

    TULIP_LOCK_ASSERT(sc);
    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);
#if defined(TULIP_DEBUG)
    sc->tulip_dbg.dbg_phyregs[regno][2] = data;
    sc->tulip_dbg.dbg_phyregs[regno][3]++;
#endif
}

#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 * const sc)
{
    TULIP_LOCK_ASSERT(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)
{
    unsigned id = 0;

    TULIP_LOCK_ASSERT(sc);
    strcpy(sc->tulip_boardid, "ZNYX ZX3XX ");
    if (sc->tulip_chipid == TULIP_21140 || sc->tulip_chipid == TULIP_21140A) {
      unsigned 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->tulip_enaddr[3] & ~3) == 0xF0 && (sc->tulip_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->tulip_enaddr[3] & ~3) == 0xF4 && (sc->tulip_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->tulip_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)
{
    u_int32_t id1, id2, ei;
    int auibnc = 0, utp = 0;
    char *cp;

    TULIP_LOCK_ASSERT(sc);
    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)
{
    TULIP_LOCK_ASSERT(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 (*(u_int32_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)
{
    TULIP_LOCK_ASSERT(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)
{
    TULIP_LOCK_ASSERT(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->tulip_ifp, "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 * const sc)
{
    TULIP_LOCK_ASSERT(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) {
          printf("\nCannot find master device for %s interrupts",
               sc->tulip_ifp->if_xname);
      }
    } else {
      strcat(sc->tulip_boardid, "unknown ");
    }
    /*      sc->tulip_boardsw = &tulip_21140_eb_boardsw; */
    return;
}

static int
tulip_srom_decode(tulip_softc_t * const sc)
{
    unsigned 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 u_int8_t *dp;
    u_int32_t leaf_offset, blocks, data;

    TULIP_LOCK_ASSERT(sc);
    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->tulip_enaddr, 6);
    /*
     * 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->tulip_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 u_int8_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 unsigned 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) {
#if defined(TULIP_DEBUG)
                  if_printf(sc->tulip_ifp, "can't find phy %d\n",
                      phyno);
#endif
                  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 unsigned phyno = *dp++;
                const u_int8_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) {
#if defined(TULIP_DEBUG)
                  if_printf(sc->tulip_ifp, "can't find phy %d\n",
                         phyno);
#endif
                  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 * const sc)
{
    unsigned cksum, rom_cksum, idx;
    u_int32_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->tulip_enaddr, 6);
      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->tulip_enaddr, sc->tulip_enaddr, 6);
                sc->tulip_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->tulip_enaddr, 6);

    cksum = *(u_int16_t *) &sc->tulip_enaddr[0];
    cksum *= 2;
    if (cksum > 65535) cksum -= 65535;
    cksum += *(u_int16_t *) &sc->tulip_enaddr[2];
    if (cksum > 65535) cksum -= 65535;
    cksum *= 2;
    if (cksum > 65535) cksum -= 65535;
    cksum += *(u_int16_t *) &sc->tulip_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->tulip_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;

    TULIP_LOCK_ASSERT(sc);
    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 * const ifp)
{
    tulip_softc_t * const sc = (tulip_softc_t *)ifp->if_softc;

    TULIP_LOCK(sc);
    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);
            TULIP_UNLOCK(sc);
            return 0;
          }
      }
    }
    sc->tulip_flags &= ~(TULIP_TXPROBE_ACTIVE|TULIP_WANTRXACT);
    tulip_reset(sc);
    tulip_init_locked(sc);
    TULIP_UNLOCK(sc);
    return 0;
}

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

    TULIP_LOCK(sc);
    if (sc->tulip_media == TULIP_MEDIA_UNKNOWN) {
      TULIP_UNLOCK(sc);
      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];
    TULIP_UNLOCK(sc);
}

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

    TULIP_LOCK_ASSERT(sc);
    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->tulip_ifp->if_flags & IFF_ALLMULTI)
      sc->tulip_flags |= TULIP_ALLMULTI ;
#endif

    multicnt = 0;
    ifp = sc->tulip_ifp;      
    IF_ADDR_LOCK(ifp);
    TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {

          if (ifma->ifma_addr->sa_family == AF_LINK)
            multicnt++;
    }

    if (multicnt > 14) {
      u_int32_t *sp = sc->tulip_setupdata;
      unsigned 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(IFP2ENADDR(ifp));
            sp[hash >> 4] |= htole32(1 << (hash & 0xF));
          } else {
            sp[39] = TULIP_SP_MAC(((u_int16_t *)IFP2ENADDR(ifp))[0]); 
            sp[40] = TULIP_SP_MAC(((u_int16_t *)IFP2ENADDR(ifp))[1]); 
            sp[41] = TULIP_SP_MAC(((u_int16_t *)IFP2ENADDR(ifp))[2]);
          }
      }
    }
    if ((sc->tulip_flags & (TULIP_WANTHASHPERFECT|TULIP_WANTHASHONLY)) == 0) {
      u_int32_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 *)IFP2ENADDR(ifp))[0]); 
          *sp++ = TULIP_SP_MAC(((u_int16_t *)IFP2ENADDR(ifp))[1]); 
          *sp++ = TULIP_SP_MAC(((u_int16_t *)IFP2ENADDR(ifp))[2]);
      }
    }
    IF_ADDR_UNLOCK(ifp);
}

static void
tulip_reset(tulip_softc_t * const sc)
{
    tulip_ringinfo_t *ri;
    tulip_descinfo_t *di;
    struct mbuf *m;
    u_int32_t inreset = (sc->tulip_flags & TULIP_INRESET);

    TULIP_LOCK_ASSERT(sc);

    CTR1(KTR_TULIP, "tulip_reset: inreset %d", 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);
      sc->tulip_ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
    }

    TULIP_CSR_WRITE(sc, csr_txlist, sc->tulip_txinfo.ri_dma_addr);
    TULIP_CSR_WRITE(sc, csr_rxlist, sc->tulip_rxinfo.ri_dma_addr);
    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;
    /*
     * Free all the mbufs that were on the transmit ring.
     */
    CTR0(KTR_TULIP, "tulip_reset: drain 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.
     */
    CTR0(KTR_TULIP, "tulip_reset: drain receive ring");
    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);
#if defined(TULIP_DEBUG)
    if ((sc->tulip_flags & TULIP_NEEDRESET) == TULIP_NEEDRESET)
      if_printf(sc->tulip_ifp,
          "tulip_reset: additional reset needed?!?\n");
#endif
    if (bootverbose)
          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(void *arg)
{
    tulip_softc_t *sc = (tulip_softc_t *)arg;

    TULIP_LOCK(sc);
    tulip_init_locked(sc);
    TULIP_UNLOCK(sc);
}

static void
tulip_init_locked(tulip_softc_t * const sc)
{
    CTR0(KTR_TULIP, "tulip_init_locked");
    if (sc->tulip_ifp->if_flags & IFF_UP) {
      if ((sc->tulip_ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
          /* initialize the media */
          CTR0(KTR_TULIP, "tulip_init_locked: up but not running, reset chip");
          tulip_reset(sc);
      }
      sc->tulip_ifp->if_drv_flags |= IFF_DRV_RUNNING;
      if (sc->tulip_ifp->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 {
          sc->tulip_ifp->if_drv_flags |= IFF_DRV_OACTIVE;
          sc->tulip_cmdmode &= ~TULIP_CMD_RXRUN;
          sc->tulip_intrmask &= ~TULIP_STS_RXSTOPPED;
      }
      CTR2(KTR_TULIP, "tulip_init_locked: intr mask %08x  cmdmode %08x",
          sc->tulip_intrmask, sc->tulip_cmdmode);
      TULIP_CSR_WRITE(sc, csr_intr, sc->tulip_intrmask);
      TULIP_CSR_WRITE(sc, csr_command, sc->tulip_cmdmode);
      CTR1(KTR_TULIP, "tulip_init_locked: status %08x\n",
          TULIP_CSR_READ(sc, csr_status));
      if ((sc->tulip_flags & (TULIP_WANTSETUP|TULIP_TXPROBE_ACTIVE)) == TULIP_WANTSETUP)
          tulip_txput_setup(sc);
    } else {
      CTR0(KTR_TULIP, "tulip_init_locked: not up, reset chip");
      sc->tulip_ifp->if_drv_flags &= ~IFF_DRV_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 * const sc)
{
    TULIP_PERFSTART(rxintr)
    tulip_ringinfo_t * const ri = &sc->tulip_rxinfo;
    struct ifnet * const ifp = sc->tulip_ifp;
    int fillok = 1;
#if defined(TULIP_DEBUG)
    int cnt = 0;
#endif

    TULIP_LOCK_ASSERT(sc);
    CTR0(KTR_TULIP, "tulip_rx_intr: start");
    for (;;) {
      TULIP_PERFSTART(rxget)
      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 defined(TULIP_DEBUG)
      if (cnt == ri->ri_max)
          break;
#endif
      /*
       * 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);
          CTR2(KTR_TULIP,
            "tulip_rx_intr: single packet mbuf %p from descriptor %td", ms,
            eop - ri->ri_first);
          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) {
#if defined(TULIP_DEBUG)
                sc->tulip_dbg.dbg_rxintrs++;
                sc->tulip_dbg.dbg_rxpktsperintr[cnt]++;
#endif
                TULIP_PERFEND(rxget);
                TULIP_PERFEND(rxintr);
                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);
          CTR2(KTR_TULIP,
            "tulip_rx_intr: start packet mbuf %p from descriptor %td", ms,
            dip - ri->ri_first);
          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;
            CTR2(KTR_TULIP,
                "tulip_rx_intr: cont packet mbuf %p from descriptor %td",
                me, dip - ri->ri_first);
          }
          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;
          CTR1(KTR_TULIP, "tulip_rx_intr: good packet; length %d",
            total_len);
      } else {
          CTR1(KTR_TULIP, "tulip_rx_intr: bad packet; status %08x",
            DESC_STATUS(eop));
          ifp->if_ierrors++;
          if (DESC_STATUS(eop) & (TULIP_DSTS_RxBADLENGTH|TULIP_DSTS_RxOVERFLOW|TULIP_DSTS_RxWATCHDOG)) {
            sc->tulip_dot3stats.dot3StatsInternalMacReceiveErrors++;
          } else {
#if defined(TULIP_VERBOSE)
            const char *error = NULL;
#endif
            if (DESC_STATUS(eop) & TULIP_DSTS_RxTOOLONG) {
                sc->tulip_dot3stats.dot3StatsFrameTooLongs++;
#if defined(TULIP_VERBOSE)
                error = "frame too long";
#endif
            }
            if (DESC_STATUS(eop) & TULIP_DSTS_RxBADCRC) {
                if (DESC_STATUS(eop) & TULIP_DSTS_RxDRBBLBIT) {
                  sc->tulip_dot3stats.dot3StatsAlignmentErrors++;
#if defined(TULIP_VERBOSE)
                  error = "alignment error";
#endif
                } else {
                  sc->tulip_dot3stats.dot3StatsFCSErrors++;
#if defined(TULIP_VERBOSE)
                  error = "bad crc";
#endif
                }
            }
#if defined(TULIP_VERBOSE)
            if (error != NULL && (sc->tulip_flags & TULIP_NOMESSAGES) == 0) {
                if_printf(sc->tulip_ifp, "receive: %6D: %s\n",
                     mtod(ms, u_char *) + 6, ":",
                     error);
                sc->tulip_flags |= TULIP_NOMESSAGES;
            }
#endif
          }

      }
#if defined(TULIP_DEBUG)
      cnt++;
#endif
      ifp->if_ipackets++;
      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"));
#if defined(TULIP_COPY_RXDATA)
          /*
           * Copy the data into a new mbuf that is properly aligned.  If
           * we fail to allocate a new mbuf, then drop the packet.  We will
           * reuse the same rx buffer ('ms') below for another packet
           * regardless.
           */
          m0 = m_devget(mtod(ms, caddr_t), total_len, ETHER_ALIGN, ifp, NULL);
          if (m0 == NULL) {
            ifp->if_ierrors++;
            goto skip_input;
          }
#else
          /*
           * 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;
          ms = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
#endif
          TULIP_UNLOCK(sc);
          CTR1(KTR_TULIP, "tulip_rx_intr: passing %p to upper layer", m0);
          (*ifp->if_input)(ifp, m0);
          TULIP_LOCK(sc);
      } 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_DONTWAIT, MT_DATA, M_PKTHDR);

#if defined(TULIP_COPY_RXDATA)
    skip_input:
#endif
      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;
#if defined(TULIP_DEBUG)
          sc->tulip_dbg.dbg_rxlowbufs++;
#endif
          TULIP_PERFEND(rxget);
          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 = MCLBYTES;
          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) {
            if_printf(sc->tulip_ifp,
                "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;
          CTR2(KTR_TULIP, "tulip_rx_intr: enqueued mbuf %p to descriptor %td",
            ms, nextout - ri->ri_first);
          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;
      TULIP_PERFEND(rxget);
    }

#if defined(TULIP_DEBUG)
    sc->tulip_dbg.dbg_rxintrs++;
    sc->tulip_dbg.dbg_rxpktsperintr[cnt]++;
#endif
    TULIP_PERFEND(rxintr);
}

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

    CTR0(KTR_TULIP, "tulip_tx_intr: start");
    TULIP_LOCK_ASSERT(sc);
    while (ri->ri_free < ri->ri_max) {
      u_int32_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) {
            CTR2(KTR_TULIP,
                "tulip_tx_intr: setup packet from descriptor %td: %08x",
                ri->ri_nextin - ri->ri_first, DESC_STATUS(ri->ri_nextin));
            /*
             * 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;
                CTR2(KTR_TULIP,
                  "tulip_tx_intr: intr mask %08x  cmdmode %08x",
                  sc->tulip_intrmask, sc->tulip_cmdmode);
                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 u_int32_t d_status = DESC_STATUS(ri->ri_nextin);

            m = tulip_dequeue_mbuf(ri, ri->ri_nextin, SYNC_TX);
            CTR2(KTR_TULIP,
                "tulip_tx_intr: data packet %p from descriptor %td", m,
                ri->ri_nextin - ri->ri_first);
            if (m != NULL) {
                m_freem(m);
#if defined(TULIP_DEBUG)
            } else {
                if_printf(sc->tulip_ifp,
                    "tx_intr: failed to dequeue mbuf?!?\n");
#endif
            }
            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)) {
#if defined(TULIP_DEBUG)
                  if (d_status & TULIP_DSTS_TxNOCARR)
                      sc->tulip_dbg.dbg_txprobe_nocarr++;
                  if (d_status & TULIP_DSTS_TxEXCCOLL)
                      sc->tulip_dbg.dbg_txprobe_exccoll++;
#endif
                  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) {
                  CTR1(KTR_TULIP, "tulip_tx_intr: output error: %08x",
                      d_status);
                  sc->tulip_ifp->if_oerrors++;
                  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;

                  CTR2(KTR_TULIP,
                "tulip_tx_intr: output ok, collisions %d, status %08x",
                      collisions, d_status);
                  sc->tulip_ifp->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)
          sc->tulip_ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
    }
    /*
     * 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;
    sc->tulip_ifp->if_opackets += xmits;
    TULIP_PERFEND(txintr);
    return descs;
}

static void
tulip_print_abnormal_interrupt(tulip_softc_t * const sc, u_int32_t csr)
{
    const char * const *msgp = tulip_status_bits;
    const char *sep;
    u_int32_t mask;
    const char thrsh[] = "72|128\0\0\0" "96|256\0\0\0" "128|512\0\0" "160|1024";

    TULIP_LOCK_ASSERT(sc);
    csr &= (1 << (sizeof(tulip_status_bits)/sizeof(tulip_status_bits[0]))) - 1;
    if_printf(sc->tulip_ifp, "abnormal interrupt:");
    for (sep = " ", mask = 1; mask <= csr; mask <<= 1, msgp++) {
      if ((csr & mask) && *msgp != NULL) {
          printf("%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) {
                printf(" (switching to store-and-forward mode)");
            } else {
                printf(" (raising TX threshold to %s)",
                     &thrsh[9 * ((sc->tulip_cmdmode & TULIP_CMD_THRESHOLDCTL) >> 14)]);
            }
          }
          sep = ", ";
      }
    }
    printf("\n");
}

static void
tulip_intr_handler(tulip_softc_t * const sc)
{
    TULIP_PERFSTART(intr)
    u_int32_t csr;

    CTR0(KTR_TULIP, "tulip_intr_handler invoked");
    TULIP_LOCK_ASSERT(sc);
    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->tulip_ifp, "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 defined(TULIP_DEBUG)
          sc->tulip_dbg.dbg_link_intrs++;
#endif
          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)
            tulip_start_locked(sc);
      }
    }
    if (sc->tulip_flags & TULIP_NEEDRESET) {
      tulip_reset(sc);
      tulip_init_locked(sc);
    }
    TULIP_PERFEND(intr);
}

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

    for (; sc != NULL; sc = sc->tulip_slaves) {
      TULIP_LOCK(sc);
#if defined(TULIP_DEBUG)
      sc->tulip_dbg.dbg_intrs++;
#endif
      tulip_intr_handler(sc);
      TULIP_UNLOCK(sc);
    }
}

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

    TULIP_LOCK(sc);
#if defined(TULIP_DEBUG)
    sc->tulip_dbg.dbg_intrs++;
#endif
    tulip_intr_handler(sc);
    TULIP_UNLOCK(sc);
}

static struct mbuf *
tulip_txput(tulip_softc_t * const sc, struct mbuf *m)
{
    TULIP_PERFSTART(txput)
    tulip_ringinfo_t * const ri = &sc->tulip_txinfo;
    tulip_descinfo_t *eop, *nextout;
    int segcnt, free;
    u_int32_t d_status;
    bus_dma_segment_t segs[TULIP_MAX_TXSEG];
    bus_dmamap_t *map;
    int error, nsegs;
    struct mbuf *m0;

    TULIP_LOCK_ASSERT(sc);
#if defined(TULIP_DEBUG)
    if ((sc->tulip_cmdmode & TULIP_CMD_TXRUN) == 0) {
      if_printf(sc->tulip_ifp, "txput%s: tx not running\n",
             (sc->tulip_flags & TULIP_TXPROBE_ACTIVE) ? "(probe)" : "");
      sc->tulip_flags |= TULIP_WANTTXSTART;
      sc->tulip_dbg.dbg_txput_finishes[0]++;
      goto finish;
    }
#endif

    /*
     * 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.
     */
#if defined(KTR) && KTR_TULIP
    segcnt = 1;
    m0 = m;
    while (m0->m_next != NULL) {
          segcnt++;
          m0 = m0->m_next;
    }
#endif
    CTR2(KTR_TULIP, "tulip_txput: sending packet %p (%d chunks)", m, segcnt);
    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) {
#if defined(TULIP_DEBUG)
      sc->tulip_dbg.dbg_no_txmaps++;
#endif
      free += tulip_tx_intr(sc);
    }
    if (free == 0) {
      sc->tulip_flags |= TULIP_WANTTXSTART;
#if defined(TULIP_DEBUG)
      sc->tulip_dbg.dbg_txput_finishes[1]++;
#endif
      goto finish;
    }
    error = bus_dmamap_load_mbuf_sg(ri->ri_data_tag, *eop->di_map, m, segs,
      &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_DONTWAIT);
          if (m0 == NULL) {
            sc->tulip_flags |= TULIP_WANTTXSTART;
#if defined(TULIP_DEBUG)
            sc->tulip_dbg.dbg_txput_finishes[2]++;
#endif
            goto finish;
          }
          m = m0;
          error = bus_dmamap_load_mbuf_sg(ri->ri_data_tag, *eop->di_map, m,
            segs, &nsegs, BUS_DMA_NOWAIT);
      }
      if (error != 0) {
          if_printf(sc->tulip_ifp,
              "unable to load tx map, error = %d\n", error);
#if defined(TULIP_DEBUG)
          sc->tulip_dbg.dbg_txput_finishes[3]++;
#endif
          goto finish;
      }
    }
    CTR1(KTR_TULIP, "tulip_txput: nsegs %d", nsegs);

    /*
     * 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;
#if defined(TULIP_DEBUG)
      sc->tulip_dbg.dbg_txput_finishes[4]++;
#endif
      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;
      eop->di_desc->d_length1 = segs[segcnt].ds_len;
      eop->di_desc->d_addr2   = segs[segcnt+1].ds_addr;
      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;
      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.
     */
    BPF_MTAP(sc->tulip_ifp, m);

    /*
     * The descriptors have been filled in.  Now get ready
     * to transmit.
     */
    CTR3(KTR_TULIP, "tulip_txput: enqueued mbuf %p to descriptors %td - %td",
      m, ri->ri_nextout - ri->ri_first, eop - ri->ri_first);
    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.
     */
    nextout->di_desc->d_status = 0;
    TULIP_TXDESC_PRESYNC(ri);

    /*
     * Mark the last and first segments, indicate we want a transmit
     * complete interrupt, and tell it to transmit!
     */
    eop->di_desc->d_flag |= 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.
     */
    ri->ri_nextout->di_desc->d_flag |= TULIP_DFLAG_TxFIRSTSEG;
    TULIP_TXDESC_PRESYNC(ri);
    ri->ri_nextout->di_desc->d_status = TULIP_DSTS_OWNER;
    TULIP_TXDESC_PRESYNC(ri);

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

    TULIP_PERFEND(txput);

    if (sc->tulip_flags & TULIP_TXPROBE_ACTIVE) {
      TULIP_CSR_WRITE(sc, csr_txpoll, 1);
      sc->tulip_ifp->if_drv_flags |= IFF_DRV_OACTIVE;
      TULIP_PERFEND(txput);
      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 defined(TULIP_DEBUG)
    sc->tulip_dbg.dbg_txput_finishes[5]++;
#endif

    /*
     * 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 defined(TULIP_DEBUG)
    sc->tulip_dbg.dbg_txput_finishes[6]++;
#endif
    if (sc->tulip_flags & (TULIP_WANTTXSTART|TULIP_DOINGSETUP)) {
      sc->tulip_ifp->if_drv_flags |= IFF_DRV_OACTIVE;
      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);
    TULIP_PERFEND(txput);
    return m;
}

static void
tulip_txput_setup(tulip_softc_t * const sc)
{
    tulip_ringinfo_t * const ri = &sc->tulip_txinfo;
    tulip_desc_t *nextout;

    TULIP_LOCK_ASSERT(sc);

    /*
     * We will transmit, at most, one setup packet per call to ifstart.
     */

#if defined(TULIP_DEBUG)
    if ((sc->tulip_cmdmode & TULIP_CMD_TXRUN) == 0) {
      if_printf(sc->tulip_ifp, "txput_setup: tx not running\n");
      sc->tulip_flags |= TULIP_WANTTXSTART;
      return;
    }
#endif
    /*
     * 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;
    bus_dmamap_sync(sc->tulip_setup_tag, sc->tulip_setup_map,
      BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
    TULIP_TXDESC_PRESYNC(ri);
    CTR1(KTR_TULIP, "tulip_txput_setup: using descriptor %td",
      ri->ri_nextout - ri->ri_first);

    /*
     * 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.
     */
    ri->ri_nextout->di_desc->d_status = 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)
{
    TULIP_PERFSTART(ifioctl)
    tulip_softc_t * const sc = (tulip_softc_t *)ifp->if_softc;
    struct ifreq *ifr = (struct ifreq *) data;
    int error = 0;

    switch (cmd) {
      case SIOCSIFFLAGS: {
          TULIP_LOCK(sc);
          tulip_addr_filter(sc); /* reinit multicast filter */
          tulip_init_locked(sc);
          TULIP_UNLOCK(sc);
          break;
      }

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

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

    TULIP_PERFEND(ifioctl);
    return error;
}

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

    TULIP_LOCK(sc);
    tulip_start_locked(sc);
    TULIP_UNLOCK(sc);

    TULIP_PERFEND(ifstart);
}

static void
tulip_start_locked(tulip_softc_t * const sc)
{
    struct mbuf *m;

    TULIP_LOCK_ASSERT(sc);

    CTR0(KTR_TULIP, "tulip_start_locked invoked");
    if ((sc->tulip_flags & (TULIP_WANTSETUP|TULIP_TXPROBE_ACTIVE)) == TULIP_WANTSETUP)
      tulip_txput_setup(sc);

    CTR1(KTR_TULIP, "tulip_start_locked: %d tx packets pending",
      sc->tulip_ifp->if_snd.ifq_len);
    while (!IFQ_DRV_IS_EMPTY(&sc->tulip_ifp->if_snd)) {
      IFQ_DRV_DEQUEUE(&sc->tulip_ifp->if_snd, m);
      if(m == NULL)
          break;
      if ((m = tulip_txput(sc, m)) != NULL) {
          IFQ_DRV_PREPEND(&sc->tulip_ifp->if_snd, m);
          break;
      }
    }
}

/*
 * Even though this routine runs at device spl, it does not break
 * our use of splnet (splsoftnet under NetBSD) for the majority
 * of this driver since 
 * if_watcbog is called from if_watchdog which is called from
 * splsoftclock which is below spl[soft]net.
 */
static void
tulip_ifwatchdog(struct ifnet *ifp)
{
    TULIP_PERFSTART(ifwatchdog)
    tulip_softc_t * const sc = (tulip_softc_t *)ifp->if_softc;
#if defined(TULIP_DEBUG)
    u_int32_t rxintrs;
#endif

    TULIP_LOCK(sc);
#if defined(TULIP_DEBUG)
    rxintrs = sc->tulip_dbg.dbg_rxintrs - sc->tulip_dbg.dbg_last_rxintrs;
    if (rxintrs > sc->tulip_dbg.dbg_high_rxintrs_hz)
      sc->tulip_dbg.dbg_high_rxintrs_hz = rxintrs;
    sc->tulip_dbg.dbg_last_rxintrs = sc->tulip_dbg.dbg_rxintrs;
#endif /* TULIP_DEBUG */

    sc->tulip_ifp->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(sc->tulip_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(sc->tulip_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_locked(sc);
    }

    TULIP_PERFEND(ifwatchdog);
    TULIP_PERFMERGE(sc, perf_intr_cycles);
    TULIP_PERFMERGE(sc, perf_ifstart_cycles);
    TULIP_PERFMERGE(sc, perf_ifioctl_cycles);
    TULIP_PERFMERGE(sc, perf_ifwatchdog_cycles);
    TULIP_PERFMERGE(sc, perf_timeout_cycles);
    TULIP_PERFMERGE(sc, perf_ifstart_one_cycles);
    TULIP_PERFMERGE(sc, perf_txput_cycles);
    TULIP_PERFMERGE(sc, perf_txintr_cycles);
    TULIP_PERFMERGE(sc, perf_rxintr_cycles);
    TULIP_PERFMERGE(sc, perf_rxget_cycles);
    TULIP_PERFMERGE(sc, perf_intr);
    TULIP_PERFMERGE(sc, perf_ifstart);
    TULIP_PERFMERGE(sc, perf_ifioctl);
    TULIP_PERFMERGE(sc, perf_ifwatchdog);
    TULIP_PERFMERGE(sc, perf_timeout);
    TULIP_PERFMERGE(sc, perf_ifstart_one);
    TULIP_PERFMERGE(sc, perf_txput);
    TULIP_PERFMERGE(sc, perf_txintr);
    TULIP_PERFMERGE(sc, perf_rxintr);
    TULIP_PERFMERGE(sc, perf_rxget);
    TULIP_UNLOCK(sc);
}

static void
tulip_attach(tulip_softc_t * const sc)
{
    struct ifnet *ifp;

    ifp = sc->tulip_ifp = if_alloc(IFT_ETHER);

    /* XXX: driver name/unit should be set some other way */
    if_initname(ifp, "de", sc->tulip_unit);
    ifp->if_softc = sc;
    ifp->if_flags = IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST;
    ifp->if_ioctl = tulip_ifioctl;
    ifp->if_start = tulip_start;
    ifp->if_watchdog = tulip_ifwatchdog;
    ifp->if_timer = 1;
    ifp->if_init = tulip_init;
    IFQ_SET_MAXLEN(&ifp->if_snd, ifqmaxlen);
    ifp->if_snd.ifq_drv_maxlen = ifqmaxlen;
    IFQ_SET_READY(&ifp->if_snd);
  
    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)" : "");

    TULIP_LOCK(sc);
#if defined(__alpha__)
    /*
     * In case the SRM console told us about a bogus media,
     * we need to check to be safe.
     */
    if (sc->tulip_mediums[sc->tulip_media] == NULL)
      sc->tulip_media = TULIP_MEDIA_UNKNOWN;
#endif

    (*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);

    tulip_reset(sc);
    TULIP_UNLOCK(sc);

    ether_ifattach(sc->tulip_ifp, sc->tulip_enaddr);
}

/* 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;
          }
      }
      free(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_ring_map = NULL;
      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 * const sc, size_t count,
    bus_size_t maxsize, 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(NULL, PAGE_SIZE, 0, BUS_SPACE_MAXADDR_32BIT,
      BUS_SPACE_MAXADDR, NULL, NULL, size, 1, size, 0, NULL, NULL,
      &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(NULL, 4, 0,
      BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
      maxsize, nsegs, TULIP_DATA_PER_DESC, 0, NULL, NULL, &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 = malloc(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 * const 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_setupdata,
          sc->tulip_setup_map);
      sc->tulip_setup_map = NULL;
      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 * const sc)
{
    int error;

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

    /*
     * Allocate a DMA tag, memory, and map for setup descriptor
     */
    error = bus_dma_tag_create(NULL, 4, 0,
      BUS_SPACE_MAXADDR_32BIT, BUS_SPACE_MAXADDR, NULL, NULL,
      sizeof(sc->tulip_setupdata), 1, sizeof(sc->tulip_setupdata), 0,
      NULL, NULL, &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 * const 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(
    device_t dev,
    tulip_softc_t * const sc,
    tulip_ringinfo_t * const ri,
    int ndescs)
{
    int i;

    ri->ri_descinfo = malloc(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);
    ri->ri_last[-1].di_desc->d_flag = 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 BUS_PROBE_LOW_PRIORITY;
    }
    return ENXIO;
}

static int
tulip_shutdown(device_t dev)
{
    tulip_softc_t * const sc = device_get_softc(dev);
    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) */
    return 0;
}

static int
tulip_pci_attach(device_t dev)
{
    tulip_softc_t *sc;
#if defined(__alpha__)
    tulip_media_t media = TULIP_MEDIA_UNKNOWN;
#endif
    int retval, idx;
    u_int32_t revinfo, cfdainfo;
    unsigned csroffset = TULIP_PCI_CSROFFSET;
    unsigned 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_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 defined(__alpha__) 
    /*
     * The Alpha SRM console encodes a console set media in the driver
     * part of the CFDA register.  Note that the Multia presents a
     * problem in that its BNC mode is really EXTSIA.  So in that case
     * force a probe.
     */
    switch ((cfdainfo >> 8) & 0xff) {
      case 1: media = chipid > TULIP_21040 ? TULIP_MEDIA_AUI : TULIP_MEDIA_AUIBNC; break;
      case 2: media = chipid > TULIP_21040 ? TULIP_MEDIA_BNC : TULIP_MEDIA_UNKNOWN; break;
      case 3: media = TULIP_MEDIA_10BASET; break;
      case 4: media = TULIP_MEDIA_10BASET_FD; break;
      case 5: media = TULIP_MEDIA_100BASETX; break;
      case 6: media = TULIP_MEDIA_100BASETX_FD; break;
      default: media = TULIP_MEDIA_UNKNOWN; break;
    }
#endif

    sc->tulip_unit = unit;
    sc->tulip_revinfo = revinfo;
#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;

    mtx_init(TULIP_MUTEX(sc), MTX_NETWORK_LOCK, device_get_nameunit(dev),
      MTX_DEF);
    callout_init_mtx(&sc->tulip_callout, TULIP_MUTEX(sc), 0);
    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);
      mtx_destroy(TULIP_MUTEX(sc));
      return ENXIO;
    }

    retval = tulip_initring(dev, sc, &sc->tulip_rxinfo, TULIP_RXDESCS);
    if (retval == 0)
      retval = tulip_initring(dev, sc, &sc->tulip_txinfo, TULIP_TXDESCS);
    if (retval) {
      tulip_busdma_cleanup(sc);
      mtx_destroy(TULIP_MUTEX(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) */

    TULIP_LOCK(sc);
    retval = tulip_read_macaddr(sc);
    TULIP_UNLOCK(sc);
    if (retval < 0) {
      device_printf(dev, "can't read ENET ROM (why=%d) (", retval);
      for (idx = 0; idx < 32; idx++)
          printf("%02x", sc->tulip_rombuf[idx]);
      printf("\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;

#if defined(__alpha__) 
      sc->tulip_media = media;
#endif
      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 == 0 || bus_setup_intr(dev, res, INTR_TYPE_NET |
                INTR_MPSAFE, intr_rtn, sc, &ih)) {
            device_printf(dev, "couldn't map interrupt\n");
            tulip_busdma_cleanup(sc);
            ether_ifdetach(sc->tulip_ifp);
            if_free(sc->tulip_ifp);
            mtx_destroy(TULIP_MUTEX(sc));
            return ENXIO;
          }
      }

#if defined(__alpha__)
      TULIP_LOCK(sc);
      if (sc->tulip_media != TULIP_MEDIA_UNKNOWN)
            tulip_linkup(sc, media);
      TULIP_UNLOCK(sc);
#endif
    }
    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),
    { 0, 0 }
};

static driver_t tulip_pci_driver = {
    "de",
    tulip_pci_methods,
    sizeof(tulip_softc_t),
};

static devclass_t tulip_devclass;

DRIVER_MODULE(de, pci, tulip_pci_driver, tulip_devclass, 0, 0);

#ifdef DDB
void  tulip_dumpring(int unit, int ring);
void  tulip_dumpdesc(int unit, int ring, int desc);
void  tulip_status(int unit);

void
tulip_dumpring(int unit, int ring)
{
    tulip_softc_t *sc;
    tulip_ringinfo_t *ri;
    tulip_descinfo_t *di;

    if (unit < 0 || unit >= TULIP_MAX_DEVICES) {
      db_printf("invalid unit %d\n", unit);
      return;
    }
    sc = tulips[unit];
    if (sc == NULL) {
      db_printf("unit %d not present\n", unit);
      return;
    }

    switch (ring) {
    case 0:
      db_printf("receive ring:\n");
      ri = &sc->tulip_rxinfo;
      break;
    case 1:
      db_printf("transmit ring:\n");
      ri = &sc->tulip_txinfo;
      break;
    default:
      db_printf("invalid ring %d\n", ring);
      return;
    }

    db_printf(" nextin: %td, nextout: %td, max: %d, free: %d\n",
      ri->ri_nextin - ri->ri_first, ri->ri_nextout - ri->ri_first,
      ri->ri_max, ri->ri_free);
    for (di = ri->ri_first; di != ri->ri_last; di++) {
      if (di->di_mbuf != NULL)
          db_printf(" descriptor %td: mbuf %p\n", di - ri->ri_first,
            di->di_mbuf);
      else if (di->di_desc->d_flag & TULIP_DFLAG_TxSETUPPKT)
          db_printf(" descriptor %td: setup packet\n", di - ri->ri_first);
    }
}

void
tulip_dumpdesc(int unit, int ring, int desc)
{
    tulip_softc_t *sc;
    tulip_ringinfo_t *ri;
    tulip_descinfo_t *di;
    char *s;

    if (unit < 0 || unit >= TULIP_MAX_DEVICES) {
      db_printf("invalid unit %d\n", unit);
      return;
    }
    sc = tulips[unit];
    if (sc == NULL) {
      db_printf("unit %d not present\n", unit);
      return;
    }

    switch (ring) {
    case 0:
      s = "receive";
      ri = &sc->tulip_rxinfo;
      break;
    case 1:
      s = "transmit";
      ri = &sc->tulip_txinfo;
      break;
    default:
      db_printf("invalid ring %d\n", ring);
      return;
    }

    if (desc < 0 || desc >= ri->ri_max) {
      db_printf("invalid descriptor %d\n", desc);
      return;
    }

    db_printf("%s descriptor %d:\n", s, desc);
    di = &ri->ri_first[desc];
    db_printf(" mbuf: %p\n", di->di_mbuf);
    db_printf(" status: %08x  flag: %03x\n", di->di_desc->d_status,
      di->di_desc->d_flag);
    db_printf("  addr1: %08x  len1: %03x\n", di->di_desc->d_addr1,
      di->di_desc->d_length1);
    db_printf("  addr2: %08x  len2: %03x\n", di->di_desc->d_addr2,
      di->di_desc->d_length2);
}
#endif

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