FreeBSD/Linux Kernel Cross Reference
sys/dev/xe/if_xe.c

     /*-
      * Copyright (c) 1998, 1999, 2003  Scott Mitchell
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    /*
     * Portions of this software were derived from Werner Koch's xirc2ps driver
     * for Linux under the terms of the following license (from v1.30 of the
     * xirc2ps driver):
     *
     * Copyright (c) 1997 by Werner Koch (dd9jn)
     *
     * 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, and the entire permission notice in its entirety,
     *    including the disclaimer of warranties.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. 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 ``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.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/5.2/sys/dev/xe/if_xe.c 122625 2003-11-13 20:55:53Z obrien $");
    
    /*              
     * FreeBSD device driver for Xircom CreditCard PCMCIA Ethernet adapters.  The
     * following cards are currently known to work with the driver:
     *   Xircom CreditCard 10/100 (CE3)
     *   Xircom CreditCard Ethernet + Modem 28 (CEM28)
     *   Xircom CreditCard Ethernet 10/100 + Modem 56 (CEM56)
     *   Xircom RealPort Ethernet 10
     *   Xircom RealPort Ethernet 10/100
     *   Xircom RealPort Ethernet 10/100 + Modem 56 (REM56, REM56G)
     *   Intel EtherExpress Pro/100 PC Card Mobile Adapter 16 (Pro/100 M16A)
     *   Compaq Netelligent 10/100 PC Card (CPQ-10/100)
     *
     * Some other cards *should* work, but support for them is either broken or in 
     * an unknown state at the moment.  I'm always interested in hearing from
     * people who own any of these cards:
     *   Xircom CreditCard 10Base-T (PS-CE2-10)
     *   Xircom CreditCard Ethernet + ModemII (CEM2)
     *   Xircom CEM28 and CEM33 Ethernet/Modem cards (may be variants of CEM2?)
     *
     * Thanks to all who assisted with the development and testing of the driver,
     * especially: Werner Koch, Duke Kamstra, Duncan Barclay, Jason George, Dru
     * Nelson, Mike Kephart, Bill Rainey and Douglas Rand.  Apologies if I've left
     * out anyone who deserves a mention here.
     *
     * Special thanks to Ade Lovett for both hosting the mailing list and doing
     * the CEM56/REM56 support code; and the FreeBSD UK Users' Group for hosting
     * the web pages.
     *
     * Author email: <scott@uk.freebsd.org>
     * Driver web page: http://ukug.uk.freebsd.org/~scott/xe_drv/
     */
    
    
    #include <sys/param.h>
    #include <sys/cdefs.h>
    #include <sys/errno.h>
    #include <sys/kernel.h>
    #include <sys/mbuf.h>
   #include <sys/socket.h>
   #include <sys/sockio.h>
   #include <sys/systm.h>
   #include <sys/uio.h>
   #include <sys/sysctl.h>
   
   #include <sys/module.h>
   #include <sys/bus.h>
   
   #include <machine/bus.h>
   #include <machine/resource.h>
   #include <sys/rman.h>
    
   #include <net/ethernet.h>
   #include <net/if.h>
   #include <net/if_arp.h>
   #include <net/if_dl.h>
   #include <net/if_media.h>
   #include <net/if_mib.h>
   #include <net/bpf.h>
   
   #include <dev/xe/if_xereg.h>
   #include <dev/xe/if_xevar.h>
   
   /*
    * MII command structure
    */
   struct xe_mii_frame {
     u_int8_t  mii_stdelim;
     u_int8_t  mii_opcode;
     u_int8_t  mii_phyaddr;
     u_int8_t  mii_regaddr;
     u_int8_t  mii_turnaround;
     u_int16_t mii_data;
   };
   
   /*
    * Media autonegotiation progress constants
    */
   #define XE_AUTONEG_NONE         0       /* No autonegotiation in progress */
   #define XE_AUTONEG_WAITING      1       /* Waiting for transmitter to go idle */
   #define XE_AUTONEG_STARTED      2       /* Waiting for autonegotiation to complete */
   #define XE_AUTONEG_100TX        3       /* Trying to force 100baseTX link */
   #define XE_AUTONEG_FAIL         4       /* Autonegotiation failed */
   
   /*
    * Multicast hashing CRC constants
    */
   #define XE_CRC_POLY  0x04c11db6
   
   /*
    * Prototypes start here
    */
   static void      xe_init                (void *xscp);
   static void      xe_start               (struct ifnet *ifp);
   static int       xe_ioctl               (struct ifnet *ifp, u_long command, caddr_t data);
   static void      xe_watchdog            (struct ifnet *ifp);
   static int       xe_media_change        (struct ifnet *ifp);
   static void      xe_media_status        (struct ifnet *ifp, struct ifmediareq *mrp);
   static timeout_t xe_setmedia;
   static void      xe_reset               (struct xe_softc *scp);
   static void      xe_stop                (struct xe_softc *scp);
   static void      xe_enable_intr         (struct xe_softc *scp);
   static void      xe_disable_intr        (struct xe_softc *scp);
   static void      xe_set_multicast       (struct xe_softc *scp);
   static void      xe_set_addr            (struct xe_softc *scp, u_int8_t* addr, unsigned idx);
   static void      xe_mchash              (struct xe_softc *scp, caddr_t addr);
   static int       xe_pio_write_packet    (struct xe_softc *scp, struct mbuf *mbp);
   
   /*
    * MII functions
    */
   static void      xe_mii_sync            (struct xe_softc *scp);
   static int       xe_mii_init            (struct xe_softc *scp);
   static void      xe_mii_send            (struct xe_softc *scp, u_int32_t bits, int cnt);
   static int       xe_mii_readreg         (struct xe_softc *scp, struct xe_mii_frame *frame);
   static int       xe_mii_writereg        (struct xe_softc *scp, struct xe_mii_frame *frame);
   static u_int16_t xe_phy_readreg         (struct xe_softc *scp, u_int16_t reg);
   static void      xe_phy_writereg        (struct xe_softc *scp, u_int16_t reg, u_int16_t data);
   
   /*
    * Debugging functions
    */
   static void      xe_mii_dump            (struct xe_softc *scp);
   #if 0
   static void      xe_reg_dump            (struct xe_softc *scp);
   #endif
   
   /*
    * Debug logging levels - set with hw.xe.debug sysctl
    * 0 = None
    * 1 = More hardware details, probe/attach progress
    * 2 = Most function calls, ioctls and media selection progress
    * 3 = Everything - interrupts, packets in/out and multicast address setup
    */
   #define XE_DEBUG
   #ifdef XE_DEBUG
   
   /* sysctl vars */
   SYSCTL_NODE(_hw, OID_AUTO, xe, CTLFLAG_RD, 0, "if_xe parameters");
   
   int xe_debug = 0;
   SYSCTL_INT(_hw_xe, OID_AUTO, debug, CTLFLAG_RW,
                      &xe_debug, 0, "if_xe debug level");
   
   #define DEVPRINTF(level, arg) if (xe_debug >= (level)) device_printf arg
   #define DPRINTF(level, arg) if (xe_debug >= (level)) printf arg
   #define XE_MII_DUMP(scp) if (xe_debug >= 3) xe_mii_dump(scp)
   #if 0
   #define XE_REG_DUMP(scp) if (xe_debug >= 3) xe_reg_dump(scp)
   #endif
   #else
   #define DEVPRINTF(level, arg)
   #define DPRINTF(level, arg)
   #define XE_MII_DUMP(scp)
   #if 0
   #define XE_REG_DUMP(scp)
   #endif
   #endif
   
   
   /*
    * Attach a device.
    */
   int
   xe_attach (device_t dev)
   {
     struct xe_softc *scp = device_get_softc(dev);
   
     DEVPRINTF(2, (dev, "attach\n"));
   
     /* Initialise stuff... */
     scp->dev = dev;
     scp->ifp = &scp->arpcom.ac_if;
     scp->ifm = &scp->ifmedia;
     scp->autoneg_status = XE_AUTONEG_NONE;
   
     /* Initialise the ifnet structure */
     scp->ifp->if_softc = scp;
     if_initname(scp->ifp, device_get_name(dev), device_get_unit(dev));
     scp->ifp->if_timer = 0;
     scp->ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
     scp->ifp->if_linkmib = &scp->mibdata;
     scp->ifp->if_linkmiblen = sizeof scp->mibdata;
     scp->ifp->if_output = ether_output;
     scp->ifp->if_start = xe_start;
     scp->ifp->if_ioctl = xe_ioctl;
     scp->ifp->if_watchdog = xe_watchdog;
     scp->ifp->if_init = xe_init;
     scp->ifp->if_baudrate = 100000000;
     scp->ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
   
     /* Initialise the ifmedia structure */
     ifmedia_init(scp->ifm, 0, xe_media_change, xe_media_status);
     callout_handle_init(&scp->chand);
   
     /* Add supported media types */
     if (scp->mohawk) {
       ifmedia_add(scp->ifm, IFM_ETHER|IFM_100_TX, 0, NULL);
       ifmedia_add(scp->ifm, IFM_ETHER|IFM_10_T|IFM_FDX, 0, NULL);
       ifmedia_add(scp->ifm, IFM_ETHER|IFM_10_T|IFM_HDX, 0, NULL);
     }
     ifmedia_add(scp->ifm, IFM_ETHER|IFM_10_T, 0, NULL);
     if (scp->ce2)
       ifmedia_add(scp->ifm, IFM_ETHER|IFM_10_2, 0, NULL);
     ifmedia_add(scp->ifm, IFM_ETHER|IFM_AUTO, 0, NULL);
   
     /* Default is to autoselect best supported media type */
     ifmedia_set(scp->ifm, IFM_ETHER|IFM_AUTO);
   
     /* Get the hardware into a known state */
     xe_reset(scp);
   
     /* Get hardware version numbers */
     XE_SELECT_PAGE(4);
     scp->version = XE_INB(XE_BOV);
     if (scp->mohawk)
       scp->srev = (XE_INB(XE_BOV) & 0x70) >> 4;
     else
       scp->srev = (XE_INB(XE_BOV) & 0x30) >> 4;
   
     /* Print some useful information */
     device_printf(dev, "%s %s, version 0x%02x/0x%02x%s%s\n",
            scp->vendor,
            scp->card_type,
            scp->version,
            scp->srev,
            scp->mohawk ? ", 100Mbps capable" : "",
            scp->modem ?  ", with modem"      : "");
     if (scp->mohawk) {
       XE_SELECT_PAGE(0x10);
       DEVPRINTF(1, (dev, "DingoID=0x%04x, RevisionID=0x%04x, VendorID=0x%04x\n",
              XE_INW(XE_DINGOID),
              XE_INW(XE_RevID),
              XE_INW(XE_VendorID)));
     }
     if (scp->ce2) {
       XE_SELECT_PAGE(0x45);
       DEVPRINTF(1, (dev, "CE2 version = 0x%#02x\n", XE_INB(XE_REV)));
     }
     device_printf(dev, "Ethernet address %6D\n", scp->arpcom.ac_enaddr, ":");
   
     /* Attach the interface */
     ether_ifattach(scp->ifp, scp->arpcom.ac_enaddr);
   
     /* Done */
     return 0;
   }
   
   
   /*
    * Complete hardware intitialisation and enable output.  Exits without doing
    * anything if there's no address assigned to the card, or if media selection
    * is in progress (the latter implies we've already run this function).
    */
   static void
   xe_init(void *xscp) {
     struct xe_softc *scp = xscp;
     unsigned i;
     int s;
   
     if (TAILQ_EMPTY(&scp->ifp->if_addrhead)) return;
   
     if (scp->autoneg_status != XE_AUTONEG_NONE) return;
   
     DEVPRINTF(2, (scp->dev, "init\n"));
   
     s = splimp();
   
     /* Reset transmitter flags */
     scp->tx_queued = 0;
     scp->tx_tpr = 0;
     scp->tx_timeouts = 0;
     scp->tx_thres = 64;
     scp->tx_min = ETHER_MIN_LEN - ETHER_CRC_LEN;
     scp->ifp->if_timer = 0;
   
     /* Soft reset the card */
     XE_SELECT_PAGE(0);
     XE_OUTB(XE_CR, XE_CR_SOFT_RESET);
     DELAY(40000);
     XE_OUTB(XE_CR, 0);
     DELAY(40000);
   
     if (scp->mohawk) {
       /*
        * set GP1 and GP2 as outputs (bits 2 & 3)
        * set GP1 low to power on the ML6692 (bit 0)
        * set GP2 high to power on the 10Mhz chip (bit 1)
        */
       XE_SELECT_PAGE(4);
       XE_OUTB(XE_GPR0, XE_GPR0_GP2_SELECT|XE_GPR0_GP1_SELECT|XE_GPR0_GP2_OUT);
     }
   
     /* Shut off interrupts */
     xe_disable_intr(scp);
   
     /* Wait for everything to wake up */
     DELAY(500000);
   
     /* Check for PHY */
     if (scp->mohawk)
       scp->phy_ok = xe_mii_init(scp);
   
     /* Disable 'source insertion' (not sure what that means) */
     XE_SELECT_PAGE(0x42);
     XE_OUTB(XE_SWC0, XE_SWC0_NO_SRC_INSERT);
   
     /* Set 8K/24K Tx/Rx buffer split */
     if (scp->srev != 1) {
       XE_SELECT_PAGE(2);
       XE_OUTW(XE_RBS, 0x2000);
     }
   
     /* Enable early transmit mode on Mohawk/Dingo */
     if (scp->mohawk) {
       XE_SELECT_PAGE(0x03);
       XE_OUTW(XE_TPT, scp->tx_thres);
       XE_SELECT_PAGE(0x01);
       XE_OUTB(XE_ECR, XE_INB(XE_ECR) | XE_ECR_EARLY_TX);
     }
   
     /* Put MAC address in first 'individual address' register */
     XE_SELECT_PAGE(0x50);
     for (i = 0; i < 6; i++)
       XE_OUTB(0x08 + i, scp->arpcom.ac_enaddr[scp->mohawk ? 5 - i : i]);
   
     /* Set up multicast addresses */
     xe_set_multicast(scp);
   
     /* Fix the receive data offset -- reset can leave it off-by-one */
     XE_SELECT_PAGE(0);
     XE_OUTW(XE_DO, 0x2000);
   
     /* Set interrupt masks */
     XE_SELECT_PAGE(1);
     XE_OUTB(XE_IMR0, XE_IMR0_TX_PACKET | XE_IMR0_MAC_INTR | XE_IMR0_RX_PACKET);
   
     /* Set MAC interrupt masks */
     XE_SELECT_PAGE(0x40);
     XE_OUTB(XE_RX0Msk,
             ~(XE_RX0M_RX_OVERRUN | XE_RX0M_CRC_ERROR
               | XE_RX0M_ALIGN_ERROR | XE_RX0M_LONG_PACKET));
     XE_OUTB(XE_TX0Msk,
             ~(XE_TX0M_SQE_FAIL | XE_TX0M_LATE_COLLISION | XE_TX0M_TX_UNDERRUN
               | XE_TX0M_16_COLLISIONS | XE_TX0M_NO_CARRIER));
   
     /* Clear MAC status registers */
     XE_SELECT_PAGE(0x40);
     XE_OUTB(XE_RST0, 0x00);
     XE_OUTB(XE_TXST0, 0x00);
   
     /* Enable receiver and put MAC online */
     XE_SELECT_PAGE(0x40);
     XE_OUTB(XE_CMD0, XE_CMD0_RX_ENABLE|XE_CMD0_ONLINE);
   
     /* Set up IMR, enable interrupts */
     xe_enable_intr(scp);
   
     /* Start media selection */
     xe_setmedia(scp);
   
     /* Enable output */
     scp->ifp->if_flags |= IFF_RUNNING;
     scp->ifp->if_flags &= ~IFF_OACTIVE;
   
     (void)splx(s);
   }
   
   
   /*
    * Start output on interface.  Should be called at splimp() priority.  Check
    * that the output is idle (ie, IFF_OACTIVE is not set) before calling this
    * function.  If media selection is in progress we set IFF_OACTIVE ourselves
    * and return immediately.
    */
   static void
   xe_start(struct ifnet *ifp) {
     struct xe_softc *scp = ifp->if_softc;
     struct mbuf *mbp;
   
     if (scp->autoneg_status != XE_AUTONEG_NONE) {
       ifp->if_flags |= IFF_OACTIVE;
       return;
     }
   
     DEVPRINTF(3, (scp->dev, "start\n"));
   
     /*
      * Loop while there are packets to be sent, and space to send them.
      */
     while (1) {
       /* Suck a packet off the send queue */
       IF_DEQUEUE(&ifp->if_snd, mbp);
   
       if (mbp == NULL) {
         /*
          * We are using the !OACTIVE flag to indicate to the outside world that
          * we can accept an additional packet rather than that the transmitter
          * is _actually_ active. Indeed, the transmitter may be active, but if
          * we haven't filled all the buffers with data then we still want to
          * accept more.
          */
         ifp->if_flags &= ~IFF_OACTIVE;
         return;
       }
   
       if (xe_pio_write_packet(scp, mbp) != 0) {
         /* Push the packet back onto the queue */
         IF_PREPEND(&ifp->if_snd, mbp);
         ifp->if_flags |= IFF_OACTIVE;
         return;
       }
   
       /* Tap off here if there is a bpf listener */
       BPF_MTAP(ifp, mbp);
   
       /* In case we don't hear from the card again... */
       ifp->if_timer = 5;
       scp->tx_queued++;
   
       m_freem(mbp);
     }
   }
   
   
   /*
    * Process an ioctl request.  Adapted from the ed driver.
    */
   static int
   xe_ioctl (register struct ifnet *ifp, u_long command, caddr_t data) {
     struct xe_softc *scp;
     int s, error;
   
     scp = ifp->if_softc;
     error = 0;
   
     s = splimp();
   
     switch (command) {
   
     case SIOCSIFFLAGS:
       DEVPRINTF(2, (scp->dev, "ioctl: SIOCSIFFLAGS: 0x%04x\n", ifp->if_flags));
       /*
        * If the interface is marked up and stopped, then start it.  If it is
        * marked down and running, then stop it.
        */
       if (ifp->if_flags & IFF_UP) {
         if (!(ifp->if_flags & IFF_RUNNING)) {
           xe_reset(scp);
           xe_init(scp);
         }
       }
       else {
         if (ifp->if_flags & IFF_RUNNING)
           xe_stop(scp);
       }
       /* FALL THROUGH  (handle changes to PROMISC/ALLMULTI flags) */
   
     case SIOCADDMULTI:
     case SIOCDELMULTI:
       DEVPRINTF(2, (scp->dev, "ioctl: SIOC{ADD,DEL}MULTI\n"));
       /*
        * Multicast list has (maybe) changed; set the hardware filters
        * accordingly.
        */
       xe_set_multicast(scp);
       error = 0;
       break;
   
     case SIOCSIFMEDIA:
     case SIOCGIFMEDIA:
       DEVPRINTF(3, (scp->dev, "ioctl: bounce to ifmedia_ioctl\n"));
       /*
        * Someone wants to get/set media options.
        */
       error = ifmedia_ioctl(ifp, (struct ifreq *)data, &scp->ifmedia, command);
       break;
   
     default:
       DEVPRINTF(3, (scp->dev, "ioctl: bounce to ether_ioctl\n"));
       error = ether_ioctl(ifp, command, data);
     }
   
     (void)splx(s);
   
     return error;
   }
   
   
   /*
    * Card interrupt handler.
    *
    * This function is probably more complicated than it needs to be, as it
    * attempts to deal with the case where multiple packets get sent between
    * interrupts.  This is especially annoying when working out the collision
    * stats.  Not sure whether this case ever really happens or not (maybe on a
    * slow/heavily loaded machine?) so it's probably best to leave this like it
    * is.
    *
    * Note that the crappy PIO used to get packets on and off the card means that 
    * you will spend a lot of time in this routine -- I can get my P150 to spend
    * 90% of its time servicing interrupts if I really hammer the network.  Could 
    * fix this, but then you'd start dropping/losing packets.  The moral of this
    * story?  If you want good network performance _and_ some cycles left over to 
    * get your work done, don't buy a Xircom card.  Or convince them to tell me
    * how to do memory-mapped I/O :)
    */
   static void
   xe_intr(void *xscp) 
   {
     struct xe_softc *scp = (struct xe_softc *) xscp;
     struct ifnet *ifp;
     u_int8_t psr, isr, esr, rsr, rst0, txst0, txst1, coll;
   
     ifp = &scp->arpcom.ac_if;
   
     /* Disable interrupts */
     if (scp->mohawk)
       XE_OUTB(XE_CR, 0);
   
     /* Cache current register page */
     psr = XE_INB(XE_PR);
   
     /* Read ISR to see what caused this interrupt */
     while ((isr = XE_INB(XE_ISR)) != 0) {
   
       /* 0xff might mean the card is no longer around */
       if (isr == 0xff) {
         DEVPRINTF(3, (scp->dev, "intr: interrupt received for missing card?\n"));
         break;
       }
   
       /* Read other status registers */
       XE_SELECT_PAGE(0x40);
       rst0 = XE_INB(XE_RST0);
       XE_OUTB(XE_RST0, 0);
       txst0 = XE_INB(XE_TXST0);
       txst1 = XE_INB(XE_TXST1);
       coll = txst1 & XE_TXST1_RETRY_COUNT;
       XE_OUTB(XE_TXST0, 0);
       XE_OUTB(XE_TXST1, 0);
       XE_SELECT_PAGE(0);
   
       DEVPRINTF(3, (scp->dev, "intr: ISR=0x%02x, RST=0x%02x, TXT=0x%02x%02x, COLL=0x%01x\n", isr, rst0, txst1, txst0, coll));
   
       if (isr & XE_ISR_TX_PACKET) {
         u_int8_t tpr, sent;
   
         /* Update packet count, accounting for rollover */
         tpr = XE_INB(XE_TPR);
         sent = -scp->tx_tpr + tpr;
   
         /* Update statistics if we actually sent anything */
         if (sent > 0) {
           scp->tx_tpr = tpr;
           scp->tx_queued -= sent;
           ifp->if_opackets += sent;
           ifp->if_collisions += coll;
   
           /*
            * According to the Xircom manual, Dingo will sometimes manage to
            * transmit a packet with triggering an interrupt.  If this happens,
            * we have sent > 1 and the collision count only reflects collisions
            * on the last packet sent (the one that triggered the interrupt).
            * Collision stats might therefore be a bit low, but there doesn't
            * seem to be anything we can do about that.
            */
   
           switch (coll) {
           case 0:
             break;
           case 1:
             scp->mibdata.dot3StatsSingleCollisionFrames++;
             scp->mibdata.dot3StatsCollFrequencies[0]++;
             break;
           default:
             scp->mibdata.dot3StatsMultipleCollisionFrames++;
             scp->mibdata.dot3StatsCollFrequencies[coll-1]++;
           }
         }
         ifp->if_timer = 0;
         ifp->if_flags &= ~IFF_OACTIVE;
       }
   
       /* Handle most MAC interrupts */
       if (isr & XE_ISR_MAC_INTR) {
   
   #if 0
         /* Carrier sense lost -- only in 10Mbit HDX mode */
         if (txst0 & XE_TXST0_NO_CARRIER || !(txst1 & XE_TXST1_LINK_STATUS)) {
           /* XXX - Need to update media status here */
           device_printf(scp->dev, "no carrier\n");
           ifp->if_oerrors++;
           scp->mibdata.dot3StatsCarrierSenseErrors++;
         }
   #endif
         /* Excessive collisions -- try sending again */
         if (txst0 & XE_TXST0_16_COLLISIONS) {
           ifp->if_collisions += 16;
           ifp->if_oerrors++;
           scp->mibdata.dot3StatsExcessiveCollisions++;
           scp->mibdata.dot3StatsMultipleCollisionFrames++;
           scp->mibdata.dot3StatsCollFrequencies[15]++;
           XE_OUTB(XE_CR, XE_CR_RESTART_TX);
         }
         /* Transmit underrun -- increase early transmit threshold */
         if (txst0 & XE_TXST0_TX_UNDERRUN && scp->mohawk) {
           DEVPRINTF(1, (scp->dev, "transmit underrun"));
           if (scp->tx_thres < ETHER_MAX_LEN) {
             if ((scp->tx_thres += 64) > ETHER_MAX_LEN)
               scp->tx_thres = ETHER_MAX_LEN;
             DPRINTF(1, (": increasing transmit threshold to %u", scp->tx_thres));
             XE_SELECT_PAGE(0x3);
             XE_OUTW(XE_TPT, scp->tx_thres);
             XE_SELECT_PAGE(0x0);
           }
           DPRINTF(1, ("\n"));
           ifp->if_oerrors++;
           scp->mibdata.dot3StatsInternalMacTransmitErrors++;
         }
         /* Late collision -- just complain about it */
         if (txst0 & XE_TXST0_LATE_COLLISION) {
           device_printf(scp->dev, "late collision\n");
           ifp->if_oerrors++;
           scp->mibdata.dot3StatsLateCollisions++;
         }
         /* SQE test failure -- just complain about it */
         if (txst0 & XE_TXST0_SQE_FAIL) {
           device_printf(scp->dev, "SQE test failure\n");
           ifp->if_oerrors++;
           scp->mibdata.dot3StatsSQETestErrors++;
         }
         /* Packet too long -- what happens to these */
         if (rst0 & XE_RST0_LONG_PACKET) {
           device_printf(scp->dev, "received giant packet\n");
           ifp->if_ierrors++;
           scp->mibdata.dot3StatsFrameTooLongs++;
         }
         /* CRC error -- packet dropped */
         if (rst0 & XE_RST0_CRC_ERROR) {
           device_printf(scp->dev, "CRC error\n");
           ifp->if_ierrors++;
           scp->mibdata.dot3StatsFCSErrors++;
         }
       }
   
       /* Handle received packet(s) */
       while ((esr = XE_INB(XE_ESR)) & XE_ESR_FULL_PACKET_RX) {
         rsr = XE_INB(XE_RSR);
   
       DEVPRINTF(3, (scp->dev, "intr: ESR=0x%02x, RSR=0x%02x\n", esr, rsr));
   
         /* Make sure packet is a good one */
         if (rsr & XE_RSR_RX_OK) {
           struct ether_header *ehp;
           struct mbuf *mbp;
           u_int16_t len;
   
           len = XE_INW(XE_RBC) - ETHER_CRC_LEN;
   
       DEVPRINTF(3, (scp->dev, "intr: receive length = %d\n", len));
   
           if (len == 0) {
             ifp->if_iqdrops++;
             continue;
           }
   
           /*
            * Allocate mbuf to hold received packet.  If the mbuf header isn't
            * big enough, we attach an mbuf cluster to hold the packet.  Note the
            * +=2 to align the packet data on a 32-bit boundary, and the +3 to
            * allow for the possibility of reading one more byte than the actual
            * packet length (we always read 16-bit words).
            * XXX - Surely there's a better way to do this alignment?
            */
           MGETHDR(mbp, M_DONTWAIT, MT_DATA);
           if (mbp == NULL) {
             ifp->if_iqdrops++;
             continue;
           }
   
           if (len + 3 > MHLEN) {
             MCLGET(mbp, M_DONTWAIT);
             if ((mbp->m_flags & M_EXT) == 0) {
               m_freem(mbp);
               ifp->if_iqdrops++;
               continue;
             }
           }
   
           mbp->m_data += 2;
           ehp = mtod(mbp, struct ether_header *);
   
           /*
            * Now get the packet in PIO mode, including the Ethernet header but
            * omitting the trailing CRC.
            */
   
           /*
            * Work around a bug in CE2 cards.  There seems to be a problem with
            * duplicated and extraneous bytes in the receive buffer, but without
            * any real documentation for the CE2 it's hard to tell for sure.
            * XXX - Needs testing on CE2 hardware
            */
           if (scp->srev == 0) {
             u_short rhs;
   
             XE_SELECT_PAGE(5);
             rhs = XE_INW(XE_RHSA);
             XE_SELECT_PAGE(0);
   
             rhs += 3;                      /* Skip control info */
   
             if (rhs >= 0x8000)
               rhs = 0;
   
             if (rhs + len > 0x8000) {
               int i;
   
               for (i = 0; i < len; i++, rhs++) {
                 ((char *)ehp)[i] = XE_INB(XE_EDP);
                 if (rhs == 0x8000) {
                   rhs = 0;
                   i--;
                 }
               }
             }
             else
               bus_space_read_multi_2(scp->bst, scp->bsh, XE_EDP, 
                                      (u_int16_t *) ehp, (len + 1) >> 1);
           }
           else
             bus_space_read_multi_2(scp->bst, scp->bsh, XE_EDP, 
                                    (u_int16_t *) ehp, (len + 1) >> 1);
   
           /* Deliver packet to upper layers */
           mbp->m_pkthdr.rcvif = ifp;
           mbp->m_pkthdr.len = mbp->m_len = len;
           (*ifp->if_input)(ifp, mbp);
           ifp->if_ipackets++;
         }
   
         /* Packet alignment error -- drop packet */
         else if (rsr & XE_RSR_ALIGN_ERROR) {
           device_printf(scp->dev, "alignment error\n");
           scp->mibdata.dot3StatsAlignmentErrors++;
           ifp->if_ierrors++;
         }
   
         /* Skip to next packet, if there is one */
         XE_OUTW(XE_DO, 0x8000);
       }
   
       /* Clear receiver overruns now we have some free buffer space */
       if (rst0 & XE_RST0_RX_OVERRUN) {
         DEVPRINTF(1, (scp->dev, "receive overrun\n"));
         ifp->if_ierrors++;
         scp->mibdata.dot3StatsInternalMacReceiveErrors++;
         XE_OUTB(XE_CR, XE_CR_CLEAR_OVERRUN);
       }
     }
   
     /* Restore saved page */
     XE_SELECT_PAGE(psr);
   
     /* Re-enable interrupts */
     XE_OUTB(XE_CR, XE_CR_ENABLE_INTR);
   
     return;
   }
   
   
   /*
    * Device timeout/watchdog routine.  Called automatically if we queue a packet 
    * for transmission but don't get an interrupt within a specified timeout
    * (usually 5 seconds).  When this happens we assume the worst and reset the
    * card.
    */
   static void
   xe_watchdog(struct ifnet *ifp) {
     struct xe_softc *scp = ifp->if_softc;
   
     device_printf(scp->dev, "watchdog timeout: resetting card\n");
     scp->tx_timeouts++;
     ifp->if_oerrors += scp->tx_queued;
     xe_stop(scp);
     xe_reset(scp);
     xe_init(scp);
   }
   
   
   /*
    * Change media selection.
    */
   static int
   xe_media_change(struct ifnet *ifp) {
     struct xe_softc *scp = ifp->if_softc;
   
     DEVPRINTF(2, (scp->dev, "media_change\n"));
   
     if (IFM_TYPE(scp->ifm->ifm_media) != IFM_ETHER)
       return(EINVAL);
   
     /*
      * Some card/media combos aren't always possible -- filter those out here.
      */
     if ((IFM_SUBTYPE(scp->ifm->ifm_media) == IFM_AUTO ||
          IFM_SUBTYPE(scp->ifm->ifm_media) == IFM_100_TX) && !scp->phy_ok)
       return (EINVAL);
   
     xe_setmedia(scp);
   
     return 0;
   }
   
   
   /*
    * Return current media selection.
    */
   static void
   xe_media_status(struct ifnet *ifp, struct ifmediareq *mrp) {
     struct xe_softc *scp = ifp->if_softc;
   
     DEVPRINTF(3, (scp->dev, "media_status\n"));
   
     /* XXX - This is clearly wrong.  Will fix once I have CE2 working */
     mrp->ifm_status = IFM_AVALID | IFM_ACTIVE;
     mrp->ifm_active = ((struct xe_softc *)ifp->if_softc)->media;
   
     return;
   }
   
   
   /*
    * Select active media.
    */
   static void xe_setmedia(void *xscp) {
     struct xe_softc *scp = xscp;
     u_int16_t bmcr, bmsr, anar, lpar;
   
     DEVPRINTF(2, (scp->dev, "setmedia\n"));
   
     /* Cancel any pending timeout */
     untimeout(xe_setmedia, scp, scp->chand);
     xe_disable_intr(scp);
   
     /* Select media */
     scp->media = IFM_ETHER;
     switch (IFM_SUBTYPE(scp->ifm->ifm_media)) {
   
      case IFM_AUTO:       /* Autoselect media */
       scp->media = IFM_ETHER|IFM_AUTO;
   
       /*
        * Autoselection is really awful.  It goes something like this:
        *
        * Wait until the transmitter goes idle (2sec timeout).
        * Reset card
        *   IF a 100Mbit PHY exists
        *     Start NWAY autonegotiation (3.5sec timeout)
        *     IF that succeeds
        *       Select 100baseTX or 10baseT, whichever was detected
        *     ELSE
        *       Reset card
        *       IF a 100Mbit PHY exists
        *         Try to force a 100baseTX link (3sec timeout)
        *         IF that succeeds
        *           Select 100baseTX
        *         ELSE
        *           Disable the PHY
        *         ENDIF
        *       ENDIF
        *     ENDIF
        *   ENDIF
        * IF nothing selected so far
        *   IF a 100Mbit PHY exists
        *     Select 10baseT
        *   ELSE
        *     Select 10baseT or 10base2, whichever is connected
        *   ENDIF
        * ENDIF
        */
       switch (scp->autoneg_status) {
   
       case XE_AUTONEG_NONE:
         DEVPRINTF(2, (scp->dev, "Waiting for idle transmitter\n"));
         scp->arpcom.ac_if.if_flags |= IFF_OACTIVE;
         scp->autoneg_status = XE_AUTONEG_WAITING;
         /* FALL THROUGH */
   
       case XE_AUTONEG_WAITING:
         if (scp->tx_queued != 0) {
           scp->chand = timeout(xe_setmedia, scp, hz/2);
           return;
         }
         if (scp->phy_ok) {
           DEVPRINTF(2, (scp->dev, "Starting autonegotiation\n"));
           bmcr = xe_phy_readreg(scp, PHY_BMCR);
           bmcr &= ~(PHY_BMCR_AUTONEGENBL);
           xe_phy_writereg(scp, PHY_BMCR, bmcr);
           anar = xe_phy_readreg(scp, PHY_ANAR);
           anar &= ~(PHY_ANAR_100BT4|PHY_ANAR_100BTXFULL|PHY_ANAR_10BTFULL);
           anar |= PHY_ANAR_100BTXHALF|PHY_ANAR_10BTHALF;
           xe_phy_writereg(scp, PHY_ANAR, anar);
           bmcr |= PHY_BMCR_AUTONEGENBL|PHY_BMCR_AUTONEGRSTR;
           xe_phy_writereg(scp, PHY_BMCR, bmcr);
           scp->autoneg_status = XE_AUTONEG_STARTED;
           scp->chand = timeout(xe_setmedia, scp, hz * 7/2);
           return;
         }
         else {
           scp->autoneg_status = XE_AUTONEG_FAIL;
         }
         break;
   
        case XE_AUTONEG_STARTED:
         bmsr = xe_phy_readreg(scp, PHY_BMSR);
         lpar = xe_phy_readreg(scp, PHY_LPAR);
         if (bmsr & (PHY_BMSR_AUTONEGCOMP|PHY_BMSR_LINKSTAT)) {
           DEVPRINTF(2, (scp->dev, "Autonegotiation complete!\n"));
           /*
            * XXX - Shouldn't have to do this, but (on my hub at least) the
            * XXX - transmitter won't work after a successful autoneg.  So we see 
            * XXX - what the negotiation result was and force that mode.  I'm
            * XXX - sure there is an easy fix for this.
            */
           if (lpar & PHY_LPAR_100BTXHALF) {
             xe_phy_writereg(scp, PHY_BMCR, PHY_BMCR_SPEEDSEL);
             XE_MII_DUMP(scp);
             XE_SELECT_PAGE(2);
             XE_OUTB(XE_MSR, XE_INB(XE_MSR) | 0x08);
             scp->media = IFM_ETHER|IFM_100_TX;
             scp->autoneg_status = XE_AUTONEG_NONE;
           }
           else {
             /*
              * XXX - Bit of a hack going on in here.
              * XXX - This is derived from Ken Hughes patch to the Linux driver
              * XXX - to make it work with 10Mbit _autonegotiated_ links on CE3B
             * XXX - cards.  What's a CE3B and how's it differ from a plain CE3?
             * XXX - these are the things we need to find out.
             */
            xe_phy_writereg(scp, PHY_BMCR, 0x0000);
            XE_SELECT_PAGE(2);
            /* BEGIN HACK */
            XE_OUTB(XE_MSR, XE_INB(XE_MSR) | 0x08);
            XE_SELECT_PAGE(0x42);
            XE_OUTB(XE_SWC1, 0x80);
            scp->media = IFM_ETHER|IFM_10_T;
            scp->autoneg_status = XE_AUTONEG_NONE;
            /* END HACK */
            /*XE_OUTB(XE_MSR, XE_INB(XE_MSR) & ~0x08);*/  /* Disable PHY? */
            /*scp->autoneg_status = XE_AUTONEG_FAIL;*/
          }
        }
        else {
          DEVPRINTF(2, (scp->dev, "Autonegotiation failed; trying 100baseTX\n"));
          XE_MII_DUMP(scp);
          if (scp->phy_ok) {
            xe_phy_writereg(scp, PHY_BMCR, PHY_BMCR_SPEEDSEL);
            scp->autoneg_status = XE_AUTONEG_100TX;
            scp->chand = timeout(xe_setmedia, scp, hz * 3);
            return;
          }
          else {
            scp->autoneg_status = XE_AUTONEG_FAIL;
          }
        }
        break;
  
       case XE_AUTONEG_100TX:
        (void)xe_phy_readreg(scp, PHY_BMSR);
        bmsr = xe_phy_readreg(scp, PHY_BMSR);
        if (bmsr & PHY_BMSR_LINKSTAT) {
          DEVPRINTF(2, (scp->dev, "Got 100baseTX link!\n"));
          XE_MII_DUMP(scp);
          XE_SELECT_PAGE(2);
          XE_OUTB(XE_MSR, XE_INB(XE_MSR) | 0x08);
          scp->media = IFM_ETHER|IFM_100_TX;
          scp->autoneg_status = XE_AUTONEG_NONE;
        }
        else {
          DEVPRINTF(2, (scp->dev, "Autonegotiation failed; disabling PHY\n"));
          XE_MII_DUMP(scp);
          xe_phy_writereg(scp, PHY_BMCR, 0x0000);
          XE_SELECT_PAGE(2);
          XE_OUTB(XE_MSR, XE_INB(XE_MSR) & ~0x08);        /* Disable PHY? */
          scp->autoneg_status = XE_AUTONEG_FAIL;
        }
        break;
      }
  
      /*
       * If we got down here _and_ autoneg_status is XE_AUTONEG_FAIL, then
       * either autonegotiation failed, or never got started to begin with.  In
       * either case, select a suitable 10Mbit media and hope it works.  We
       * don't need to reset the card again, since it will have been done
       * already by the big switch above.
       */
      if (scp->autoneg_status == XE_AUTONEG_FAIL) {
        DEVPRINTF(2, (scp->dev, "Selecting 10baseX\n"));
        if (scp->mohawk) {
          XE_SELECT_PAGE(0x42);
          XE_OUTB(XE_SWC1, 0x80);
          scp->media = IFM_ETHER|IFM_10_T;
          scp->autoneg_status = XE_AUTONEG_NONE;
        }
        else {
          XE_SELECT_PAGE(4);
          XE_OUTB(XE_GPR0, 4);
          DELAY(50000);
          XE_SELECT_PAGE(0x42);
          XE_OUTB(XE_SWC1, (XE_INB(XE_ESR) & XE_ESR_MEDIA_SELECT) ? 0x80 : 0xc0);
          scp->media = IFM_ETHER|((XE_INB(XE_ESR) & XE_ESR_MEDIA_SELECT) ? IFM_10_T : IFM_10_2);
          scp->autoneg_status = XE_AUTONEG_NONE;
        }
      }
      break;
  
  
      /*
       * If a specific media has been requested, we just reset the card and
       * select it (one small exception -- if 100baseTX is requested by there is 
       * no PHY, we fall back to 10baseT operation).
       */
     case IFM_100_TX:     /* Force 100baseTX */
      if (scp->phy_ok) {
        DEVPRINTF(2, (scp->dev, "Selecting 100baseTX\n"));
        XE_SELECT_PAGE(0x42);
        XE_OUTB(XE_SWC1, 0);
        xe_phy_writereg(scp, PHY_BMCR, PHY_BMCR_SPEEDSEL);
        XE_SELECT_PAGE(2);
        XE_OUTB(XE_MSR, XE_INB(XE_MSR) | 0x08);
        scp->media |= IFM_100_TX;
        break;
      }
      /* FALLTHROUGH */
  
     case IFM_10_T:       /* Force 10baseT */
      DEVPRINTF(2, (scp->dev, "Selecting 10baseT\n"));
      if (scp->phy_ok) {
        xe_phy_writereg(scp, PHY_BMCR, 0x0000);
        XE_SELECT_PAGE(2);
        XE_OUTB(XE_MSR, XE_INB(XE_MSR) & ~0x08);  /* Disable PHY */
      }
      XE_SELECT_PAGE(0x42);
      XE_OUTB(XE_SWC1, 0x80);
      scp->media |= IFM_10_T;
      break;
  
     case IFM_10_2:
      DEVPRINTF(2, (scp->dev, "Selecting 10base2\n"));
      XE_SELECT_PAGE(0x42);
      XE_OUTB(XE_SWC1, 0xc0);
      scp->media |= IFM_10_2;
      break;
    }
  
  
    /*
     * Finally, the LEDs are set to match whatever media was chosen and the
     * transmitter is unblocked. 
     */
    DEVPRINTF(2, (scp->dev, "Setting LEDs\n"));
    XE_SELECT_PAGE(2);
    switch (IFM_SUBTYPE(scp->media)) {
     case IFM_100_TX:
     case IFM_10_T:
      XE_OUTB(XE_LED, 0x3b);
      if (scp->dingo)
        XE_OUTB(0x0b, 0x04);      /* 100Mbit LED */
      break;
  
     case IFM_10_2:
      XE_OUTB(XE_LED, 0x3a);
      break;
    }
  
    /* Restart output? */
    xe_enable_intr(scp);
    scp->ifp->if_flags &= ~IFF_OACTIVE;
    xe_start(scp->ifp);
  }
  
  
  /*
   * Hard reset (power cycle) the card.
   */
  static void
  xe_reset(struct xe_softc *scp) {
    int s;
  
    DEVPRINTF(2, (scp->dev, "reset\n"));
  
    s = splimp();
  
    /* Power down */
    XE_SELECT_PAGE(4);
    XE_OUTB(XE_GPR1, 0);
    DELAY(40000);
  
    /* Power up again */
    if (scp->mohawk)
      XE_OUTB(XE_GPR1, XE_GPR1_POWER_DOWN);
    else
      XE_OUTB(XE_GPR1, XE_GPR1_POWER_DOWN|XE_GPR1_AIC);
  
    DELAY(40000);
    XE_SELECT_PAGE(0);
  
    (void)splx(s);
  }
  
  
  /*
   * Take interface offline.  This is done by powering down the device, which I
   * assume means just shutting down the transceiver and Ethernet logic.  This
   * requires a _hard_ reset to recover from, as we need to power up again.
   */
  static void
  xe_stop(struct xe_softc *scp) {
    int s;
  
    DEVPRINTF(2, (scp->dev, "stop\n"));
  
    s = splimp();
  
    /*
     * Shut off interrupts.
     */
    xe_disable_intr(scp);
  
    /*
     * Power down.
     */
    XE_SELECT_PAGE(4);
    XE_OUTB(XE_GPR1, 0);
    XE_SELECT_PAGE(0);
    if (scp->mohawk) {
      /*
       * set GP1 and GP2 as outputs (bits 2 & 3)
       * set GP1 high to power on the ML6692 (bit 0)
       * set GP2 low to power on the 10Mhz chip (bit 1)
       */
      XE_SELECT_PAGE(4);
      XE_OUTB(XE_GPR0, XE_GPR0_GP2_SELECT|XE_GPR0_GP1_SELECT|XE_GPR0_GP1_OUT);
    }
  
    /*
     * ~IFF_RUNNING == interface down.
     */
    scp->ifp->if_flags &= ~IFF_RUNNING;
    scp->ifp->if_flags &= ~IFF_OACTIVE;
    scp->ifp->if_timer = 0;
  
    (void)splx(s);
  }
  
  
  /*
   * Enable interrupts from the card.
   */
  static void
  xe_enable_intr(struct xe_softc *scp) {
  
    DEVPRINTF(2, (scp->dev, "enable_intr\n"));
  
    XE_SELECT_PAGE(0);
    XE_OUTB(XE_CR, XE_CR_ENABLE_INTR);    /* Enable interrupts */
    if (scp->modem && !scp->dingo) {      /* This bit is just magic */
      if (!(XE_INB(0x10) & 0x01)) {
        XE_OUTB(0x10, 0x11);              /* Unmask master int enable bit */
      }
    }
  }
  
  
  /*
   * Disable interrupts from the card.
   */
  static void
  xe_disable_intr(struct xe_softc *scp) {
  
    DEVPRINTF(2, (scp->dev, "disable_intr\n"));
  
    XE_SELECT_PAGE(0);
    XE_OUTB(XE_CR, 0);                    /* Disable interrupts */
    if (scp->modem && !scp->dingo) {      /* More magic */
      XE_OUTB(0x10, 0x10);                /* Mask the master int enable bit */
    }
  }
  
  
  /*
   * Set up multicast filter and promiscuous modes.
   */
  static void
  xe_set_multicast(struct xe_softc *scp) {
    struct ifnet *ifp;
    struct ifmultiaddr *maddr;
    unsigned count, i;
  
    DEVPRINTF(2, (scp->dev, "set_multicast\n"));
  
    ifp = &scp->arpcom.ac_if;
    XE_SELECT_PAGE(0x42);
  
    /* Handle PROMISC flag */
    if (ifp->if_flags & IFF_PROMISC) {
      XE_OUTB(XE_SWC1, XE_INB(XE_SWC1) | XE_SWC1_PROMISCUOUS);
      return;
    }
    else
      XE_OUTB(XE_SWC1, XE_INB(XE_SWC1) & ~XE_SWC1_PROMISCUOUS);
  
    /* Handle ALLMULTI flag */
    if (ifp->if_flags & IFF_ALLMULTI) {
      XE_OUTB(XE_SWC1, XE_INB(XE_SWC1) | XE_SWC1_ALLMULTI);
      return;
    }
    else
      XE_OUTB(XE_SWC1, XE_INB(XE_SWC1) & ~XE_SWC1_ALLMULTI);
  
    /* Iterate over multicast address list */
    count = 0;
  #if __FreeBSD_version < 500000
    LIST_FOREACH(maddr, &ifp->if_multiaddrs, ifma_link) {
  #else
    TAILQ_FOREACH(maddr, &ifp->if_multiaddrs, ifma_link) {
  #endif
      if (maddr->ifma_addr->sa_family != AF_LINK)
        continue;
  
      count++;
  
      if (count < 10)
        /* First 9 use Individual Addresses for exact matching */
        xe_set_addr(scp, LLADDR((struct sockaddr_dl *)maddr->ifma_addr), count);
      else
        if (scp->mohawk)
          /* Use hash filter on Mohawk and Dingo */
          xe_mchash(scp, LLADDR((struct sockaddr_dl *)maddr->ifma_addr));
        else
          /* Nowhere else to put them on CE2 */
          break;
    }
  
    DEVPRINTF(2, (scp->dev, "set_multicast: count = %u\n", count));
  
    /* Now do some cleanup and enable multicast handling as needed */
    if (count == 0) {
      /* Disable all multicast handling */
      XE_SELECT_PAGE(0x42);
      XE_OUTB(XE_SWC1, XE_INB(XE_SWC1) & ~(XE_SWC1_IA_ENABLE|XE_SWC1_ALLMULTI));
      if (scp->mohawk) {
        XE_SELECT_PAGE(0x02);
        XE_OUTB(XE_MSR, XE_INB(XE_MSR) & ~XE_MSR_HASH_TABLE);
      }
    }
    else if (count < 10) {
      /* Full in any unused Individual Addresses with our MAC address */
      for (i = count + 1; i < 10; i++)
        xe_set_addr(scp, (u_int8_t *)(&scp->arpcom.ac_enaddr), i);
      /* Enable Individual Address matching only */
      XE_SELECT_PAGE(0x42);
      XE_OUTB(XE_SWC1, (XE_INB(XE_SWC1) & ~XE_SWC1_ALLMULTI) | XE_SWC1_IA_ENABLE);
      if (scp->mohawk) {
        XE_SELECT_PAGE(0x02);
        XE_OUTB(XE_MSR, XE_INB(XE_MSR) & ~XE_MSR_HASH_TABLE);
      }
    }    
    else {
      if (scp->mohawk) {
        /* Check whether hash table is full */
        XE_SELECT_PAGE(0x58);
        for (i = 0x08; i < 0x10; i++)
          if (XE_INB(i) != 0xff)
            break;
        if (i == 0x10) {
          /* Hash table full - enable promiscuous multicast matching */
          XE_SELECT_PAGE(0x42);
          XE_OUTB(XE_SWC1, (XE_INB(XE_SWC1) & ~XE_SWC1_IA_ENABLE) | XE_SWC1_ALLMULTI);
          XE_SELECT_PAGE(0x02);
          XE_OUTB(XE_MSR, XE_INB(XE_MSR) & ~XE_MSR_HASH_TABLE);
        }
        else {
          /* Enable hash table and Individual Address matching */
          XE_SELECT_PAGE(0x42);
          XE_OUTB(XE_SWC1, (XE_INB(XE_SWC1) & ~XE_SWC1_ALLMULTI) | XE_SWC1_IA_ENABLE);
          XE_SELECT_PAGE(0x02);
          XE_OUTB(XE_MSR, XE_INB(XE_MSR) | XE_MSR_HASH_TABLE);
        }
      }
      else {
        /* Enable promiscuous multicast matching */
        XE_SELECT_PAGE(0x42);
        XE_OUTB(XE_SWC1, (XE_INB(XE_SWC1) & ~XE_SWC1_IA_ENABLE) | XE_SWC1_ALLMULTI);
      }
    }
  
    XE_SELECT_PAGE(0);
  }
  
  
  /*
   * Copy the Ethernet multicast address in addr to the on-chip registers for
   * Individual Address idx.  Assumes that addr is really a multicast address
   * and that idx > 0 (slot 0 is always used for the card MAC address).
   */
  static void
  xe_set_addr(struct xe_softc *scp, u_int8_t* addr, unsigned idx) {
    u_int8_t page, reg;
    unsigned i;
  
    /*
     * Individual Addresses are stored in registers 8-F of pages 0x50-0x57.  IA1
     * therefore starts at register 0xE on page 0x50.  The expressions below
     * compute the starting page and register for any IA index > 0.
     */
    --idx;
    page = 0x50 + idx%4 + idx/4*3;
    reg = 0x0e - 2 * (idx%4);
  
    DEVPRINTF(3, (scp->dev, "set_addr: idx = %u, page = 0x%02x, reg = 0x%02x\n",
                  idx+1, page, reg));
  
    /*
     * Copy the IA bytes.  Note that the byte order is reversed for Mohawk and
     * Dingo wrt. CE2 hardware.
     */
    XE_SELECT_PAGE(page);
    for (i = 0; i < 6; i++) {
      if (i > 0) {
        DPRINTF(3, (":%02x", addr[i]));
      }
      else {
        DEVPRINTF(3, (scp->dev, "set_addr: %02x", addr[0]));
      }
      XE_OUTB(reg, addr[scp->mohawk ? 5 - i : i]);
      if (++reg == 0x10) {
        reg = 0x08;
        XE_SELECT_PAGE(++page);
      }
    }
    DPRINTF(3, ("\n"));
  }
  
  
  /*
   * Set the appropriate bit in the multicast hash table for the supplied
   * Ethernet multicast address addr.  Assumes that addr is really a multicast
   * address.
   */
  static void
  xe_mchash(struct xe_softc* scp, caddr_t addr) {
    u_int32_t crc = 0xffffffff;
    int idx, bit;
    u_int8_t carry, byte, data, crc31, hash;
  
    /* Compute CRC of the address -- standard Ethernet CRC function */
    for (data = *addr++, idx = 0; idx < 6; idx++, data >>= 1) {
      for (bit = 1; bit <= 8; bit++) {
        if (crc & 0x80000000)
          crc31 = 0x01;
        else
          crc31 = 0;
        carry = crc31 ^ (data & 0x01);
        crc <<= 1;
        data >>= 1;
          crc = (crc ^ XE_CRC_POLY) | (carry|0x1);
      }
    }
  
    DEVPRINTF(3, (scp->dev, "set_hash: CRC = 0x%08x\n", crc));
  
    /*
     * Convert a CRC into an index into the multicast hash table.  What we do is
     * take the most-significant 6 bits of the CRC, reverse them, and use that as
     * the bit number in the hash table.  Bits 5:3 of the result give the byte
     * within the table (0-7); bits 2:0 give the bit number within that byte (also
     * 0-7), ie. the number of shifts needed to get it into the lsb position.
     */
    for (idx = 0, hash = 0; idx < 6; idx++) {
      hash >>= 1;
      if (crc & 0x80000000) {
        hash |= 0x20;
      }
      crc <<= 1;
    }
  
    /* Top 3 bits of hash give register - 8, bottom 3 give bit within register */
    byte = hash >> 3 | 0x08;
    carry = 0x01 << (hash & 0x07);
  
    DEVPRINTF(3, (scp->dev, "set_hash: hash = 0x%02x, byte = 0x%02x, carry = 0x%02x\n", hash, byte, carry));
  
    XE_SELECT_PAGE(0x58);
    XE_OUTB(byte, XE_INB(byte) | carry);
  }
  
  
  /*
   * Write an outgoing packet to the card using programmed I/O.
   */
  static int
  xe_pio_write_packet(struct xe_softc *scp, struct mbuf *mbp) {
    unsigned len, pad;
    unsigned char wantbyte;
    u_int8_t *data;
    u_int8_t savebyte[2];
  
    /* Get total packet length */
    if (mbp->m_flags & M_PKTHDR)
      len = mbp->m_pkthdr.len;
    else {
      struct mbuf* mbp2 = mbp;
      for (len = 0; mbp2 != NULL; len += mbp2->m_len, mbp2 = mbp2->m_next);
    }
  
    DEVPRINTF(3, (scp->dev, "pio_write_packet: len = %u\n", len));
  
    /* Packets < minimum length may need to be padded out */
    pad = 0;
    if (len < scp->tx_min) {
      pad = scp->tx_min - len;
      len = scp->tx_min;
    }
  
    /* Check transmit buffer space */
    XE_SELECT_PAGE(0);
    XE_OUTW(XE_TRS, len+2);       /* Only effective on rev. 1 CE2 cards */
    if ((XE_INW(XE_TSO) & 0x7fff) <= len + 2)
      return 1;
  
    /* Send packet length to card */
    XE_OUTW(XE_EDP, len);
  
    /*
     * Write packet to card using PIO (code stolen from the ed driver)
     */
    wantbyte = 0;
    while (mbp != NULL) {
      len = mbp->m_len;
      if (len > 0) {
        data = mtod(mbp, caddr_t);
        if (wantbyte) {           /* Finish the last word */
          savebyte[1] = *data;
          XE_OUTW(XE_EDP, *(u_short *)savebyte);
          data++;
          len--;
          wantbyte = 0;
        }
        if (len > 1) {            /* Output contiguous words */
          bus_space_write_multi_2(scp->bst, scp->bsh, XE_EDP, (u_int16_t *) data,
                                  len >> 1);
          data += len & ~1;
          len &= 1;
        }
        if (len == 1) {           /* Save last byte, if necessary */
          savebyte[0] = *data;
          wantbyte = 1;
        }
      }
      mbp = mbp->m_next;
    }
  
    /*
     * Send last byte of odd-length packets
     */
    if (wantbyte)
      XE_OUTB(XE_EDP, savebyte[0]);
  
    /*
     * Can just tell CE3 cards to send; short packets will be padded out with
     * random cruft automatically.  For CE2, manually pad the packet with
     * garbage; it will be sent when the required number or bytes have been
     * delivered to the card.
     */
    if (scp->mohawk)
      XE_OUTB(XE_CR, XE_CR_TX_PACKET | XE_CR_RESTART_TX | XE_CR_ENABLE_INTR);
    else if (pad > 0) {
      if (pad & 0x01)
        XE_OUTB(XE_EDP, 0xaa);
      pad >>= 1;
      while (pad > 0) {
        XE_OUTW(XE_EDP, 0xdead);
        pad--;
      }
    }
  
    return 0;
  }
  
  
  
  /**************************************************************
   *                                                            *
   *                  M I I  F U N C T I O N S                  *
   *                                                            *
   **************************************************************/
  
  /*
   * Alternative MII/PHY handling code adapted from the xl driver.  It doesn't
   * seem to work any better than the xirc2_ps stuff, but it's cleaner code.
   * XXX - this stuff shouldn't be here.  It should all be abstracted off to
   * XXX - some kind of common MII-handling code, shared by all drivers.  But
   * XXX - that's a whole other mission.
   */
  #define XE_MII_SET(x)   XE_OUTB(XE_GPR2, (XE_INB(XE_GPR2) | 0x04) | (x))
  #define XE_MII_CLR(x)   XE_OUTB(XE_GPR2, (XE_INB(XE_GPR2) | 0x04) & ~(x))
  
  
  /*
   * Sync the PHYs by setting data bit and strobing the clock 32 times.
   */
  static void
  xe_mii_sync(struct xe_softc *scp) {
    register int i;
  
    XE_SELECT_PAGE(2);
    XE_MII_SET(XE_MII_DIR|XE_MII_WRD);
  
    for (i = 0; i < 32; i++) {
      XE_MII_SET(XE_MII_CLK);
      DELAY(1);
      XE_MII_CLR(XE_MII_CLK);
      DELAY(1);
    }
  }
  
  
  /*
   * Look for a MII-compliant PHY.  If we find one, reset it.
   */
  static int
  xe_mii_init(struct xe_softc *scp) {
    u_int16_t status;
  
    status = xe_phy_readreg(scp, PHY_BMSR);
    if ((status & 0xff00) != 0x7800) {
      DEVPRINTF(2, (scp->dev, "no PHY found, %0x\n", status));
      return 0;
    }
    else {
      DEVPRINTF(2, (scp->dev, "PHY OK!\n"));
  
      /* Reset the PHY */
      xe_phy_writereg(scp, PHY_BMCR, PHY_BMCR_RESET);
      DELAY(500);
      while(xe_phy_readreg(scp, PHY_BMCR) & PHY_BMCR_RESET);
      XE_MII_DUMP(scp);
      return 1;
    }
  }
  
  
  /*
   * Clock a series of bits through the MII.
   */
  static void
  xe_mii_send(struct xe_softc *scp, u_int32_t bits, int cnt) {
    int i;
  
    XE_SELECT_PAGE(2);
    XE_MII_CLR(XE_MII_CLK);
    
    for (i = (0x1 << (cnt - 1)); i; i >>= 1) {
      if (bits & i) {
        XE_MII_SET(XE_MII_WRD);
      } else {
        XE_MII_CLR(XE_MII_WRD);
      }
      DELAY(1);
      XE_MII_CLR(XE_MII_CLK);
      DELAY(1);
      XE_MII_SET(XE_MII_CLK);
    }
  }
  
  
  /*
   * Read an PHY register through the MII.
   */
  static int
  xe_mii_readreg(struct xe_softc *scp, struct xe_mii_frame *frame) {
    int i, ack, s;
  
    s = splimp();
  
    /*
     * Set up frame for RX.
     */
    frame->mii_stdelim = XE_MII_STARTDELIM;
    frame->mii_opcode = XE_MII_READOP;
    frame->mii_turnaround = 0;
    frame->mii_data = 0;
          
    XE_SELECT_PAGE(2);
    XE_OUTB(XE_GPR2, 0);
  
    /*
     * Turn on data xmit.
     */
    XE_MII_SET(XE_MII_DIR);
  
    xe_mii_sync(scp);
  
    /*    
     * Send command/address info.
     */
    xe_mii_send(scp, frame->mii_stdelim, 2);
    xe_mii_send(scp, frame->mii_opcode, 2);
    xe_mii_send(scp, frame->mii_phyaddr, 5);
    xe_mii_send(scp, frame->mii_regaddr, 5);
  
    /* Idle bit */
    XE_MII_CLR((XE_MII_CLK|XE_MII_WRD));
    DELAY(1);
    XE_MII_SET(XE_MII_CLK);
    DELAY(1);
  
    /* Turn off xmit. */
    XE_MII_CLR(XE_MII_DIR);
  
    /* Check for ack */
    XE_MII_CLR(XE_MII_CLK);
    DELAY(1);
    ack = XE_INB(XE_GPR2) & XE_MII_RDD;
    XE_MII_SET(XE_MII_CLK);
    DELAY(1);
  
    /*
     * Now try reading data bits. If the ack failed, we still
     * need to clock through 16 cycles to keep the PHY(s) in sync.
     */
    if (ack) {
      for(i = 0; i < 16; i++) {
        XE_MII_CLR(XE_MII_CLK);
        DELAY(1);
        XE_MII_SET(XE_MII_CLK);
        DELAY(1);
      }
      goto fail;
    }
  
    for (i = 0x8000; i; i >>= 1) {
      XE_MII_CLR(XE_MII_CLK);
      DELAY(1);
      if (!ack) {
        if (XE_INB(XE_GPR2) & XE_MII_RDD)
          frame->mii_data |= i;
        DELAY(1);
      }
      XE_MII_SET(XE_MII_CLK);
      DELAY(1);
    }
  
  fail:
  
    XE_MII_CLR(XE_MII_CLK);
    DELAY(1);
    XE_MII_SET(XE_MII_CLK);
    DELAY(1);
  
    splx(s);
  
    if (ack)
      return(1);
    return(0);
  }
  
  
  /*
   * Write to a PHY register through the MII.
   */
  static int
  xe_mii_writereg(struct xe_softc *scp, struct xe_mii_frame *frame) {
    int s;
  
    s = splimp();
  
    /*
     * Set up frame for TX.
     */
    frame->mii_stdelim = XE_MII_STARTDELIM;
    frame->mii_opcode = XE_MII_WRITEOP;
    frame->mii_turnaround = XE_MII_TURNAROUND;
          
    XE_SELECT_PAGE(2);
  
    /*            
     * Turn on data output.
     */
    XE_MII_SET(XE_MII_DIR);
  
    xe_mii_sync(scp);
  
    xe_mii_send(scp, frame->mii_stdelim, 2);
    xe_mii_send(scp, frame->mii_opcode, 2);
    xe_mii_send(scp, frame->mii_phyaddr, 5);
    xe_mii_send(scp, frame->mii_regaddr, 5);
    xe_mii_send(scp, frame->mii_turnaround, 2);
    xe_mii_send(scp, frame->mii_data, 16);
  
    /* Idle bit. */
    XE_MII_SET(XE_MII_CLK);
    DELAY(1);
    XE_MII_CLR(XE_MII_CLK);
    DELAY(1);
  
    /*
     * Turn off xmit.
     */
    XE_MII_CLR(XE_MII_DIR);
  
    splx(s);
  
    return(0);
  }
  
  
  /*
   * Read a register from the PHY.
   */
  static u_int16_t
  xe_phy_readreg(struct xe_softc *scp, u_int16_t reg) {
    struct xe_mii_frame frame;
  
    bzero((char *)&frame, sizeof(frame));
  
    frame.mii_phyaddr = 0;
    frame.mii_regaddr = reg;
    xe_mii_readreg(scp, &frame);
  
    return(frame.mii_data);
  }
  
  
  /*
   * Write to a PHY register.
   */
  static void
  xe_phy_writereg(struct xe_softc *scp, u_int16_t reg, u_int16_t data) {
    struct xe_mii_frame frame;
  
    bzero((char *)&frame, sizeof(frame));
  
    frame.mii_phyaddr = 0;
    frame.mii_regaddr = reg;
    frame.mii_data = data;
    xe_mii_writereg(scp, &frame);
  
    return;
  }
  
  
  /*
   * A bit of debugging code.
   */
  static void
  xe_mii_dump(struct xe_softc *scp) {
    int i, s;
  
    s = splimp();
  
    device_printf(scp->dev, "MII registers: ");
    for (i = 0; i < 2; i++) {
      printf(" %d:%04x", i, xe_phy_readreg(scp, i));
    }
    for (i = 4; i < 7; i++) {
      printf(" %d:%04x", i, xe_phy_readreg(scp, i));
    }
    printf("\n");
  
    (void)splx(s);
  }
  
  #if 0
  void
  xe_reg_dump(struct xe_softc *scp) {
    int page, i, s;
  
    s = splimp();
  
    device_printf(scp->dev, "Common registers: ");
    for (i = 0; i < 8; i++) {
      printf(" %2.2x", XE_INB(i));
    }
    printf("\n");
  
    for (page = 0; page <= 8; page++) {
      device_printf(scp->dev, "Register page %2.2x: ", page);
      XE_SELECT_PAGE(page);
      for (i = 8; i < 16; i++) {
        printf(" %2.2x", XE_INB(i));
      }
      printf("\n");
    }
  
    for (page = 0x10; page < 0x5f; page++) {
      if ((page >= 0x11 && page <= 0x3f) ||
          (page == 0x41) ||
          (page >= 0x43 && page <= 0x4f) ||
          (page >= 0x59))
        continue;
      device_printf(scp->dev, "Register page %2.2x: ", page);
      XE_SELECT_PAGE(page);
      for (i = 8; i < 16; i++) {
        printf(" %2.2x", XE_INB(i));
      }
      printf("\n");
    }
  
    (void)splx(s);
  }
  #endif
  
  int
  xe_activate(device_t dev)
  {
          struct xe_softc *sc = device_get_softc(dev);
          int start, err, i;
  
          DEVPRINTF(2, (dev, "activate\n"));
  
          if (!sc->modem) {
                  sc->port_rid = 0;       /* 0 is managed by pccard */
                  sc->port_res = bus_alloc_resource(dev, SYS_RES_IOPORT,
                      &sc->port_rid, 0, ~0, 16, RF_ACTIVE);
          }
          else if (sc->dingo) {
                  /*
                   * Find a 16 byte aligned ioport for the card.
                   */
                  DEVPRINTF(1, (dev, "Finding an aligned port for RealPort\n"));
                  sc->port_rid = 1;       /* 0 is managed by pccard */
                  start = 0x100;
                  do {
                          sc->port_res = bus_alloc_resource(dev,
                              SYS_RES_IOPORT, &sc->port_rid, start, 0x3ff, 16,
                              RF_ACTIVE);
                          if (sc->port_res == 0)
                                  break;          /* we failed */
                          if ((rman_get_start(sc->port_res) & 0xf) == 0)
                                  break;          /* good */
                          bus_release_resource(dev, SYS_RES_IOPORT, sc->port_rid, 
                              sc->port_res);
                          start = (rman_get_start(sc->port_res) + 15) & ~0xf;
                  } while (1);
                  DEVPRINTF(1, (dev, "RealPort port 0x%0lx, size 0x%0lx\n",
                      bus_get_resource_start(dev, SYS_RES_IOPORT, sc->port_rid),
                      bus_get_resource_count(dev, SYS_RES_IOPORT, sc->port_rid)));
          }
          else if (sc->ce2) {
              /*
               * Find contiguous I/O port for the Ethernet function on CEM2 and
               * CEM3 cards.  We allocate window 0 wherever pccard has decided
               * it should be, then find an available window adjacent to it for
               * the second function.  Not sure that both windows are actually
               * needed.
               */
              DEVPRINTF(1, (dev, "Finding I/O port for CEM2/CEM3\n"));
              sc->ce2_port_rid = 0;       /* 0 is managed by pccard */
              sc->ce2_port_res = bus_alloc_resource(dev, SYS_RES_IOPORT,
                                                    &sc->ce2_port_rid, 0, ~0,
                                                    8, RF_ACTIVE);
              if (!sc->ce2_port_res) {
                  DEVPRINTF(1, (dev, "Cannot allocate I/O port for modem\n"));
                  return ENOMEM;
              }
  
              sc->port_rid = 1;
              start = bus_get_resource_start(dev, SYS_RES_IOPORT,
                                             sc->ce2_port_rid);
              for (i = 0; i < 2; i++) {
                  start += (i == 0 ? 8 : -24);
                  sc->port_res = bus_alloc_resource(dev, SYS_RES_IOPORT,
                                                    &sc->port_rid, start,
                                                    start + 18, 18, RF_ACTIVE);
                  if (sc->port_res == 0)
                      continue;   /* Failed, try again if possible */
                  if (bus_get_resource_start(dev, SYS_RES_IOPORT,
                                             sc->port_rid) == start)
                      break;      /* Success! */
  
                  bus_release_resource(dev, SYS_RES_IOPORT, sc->port_rid,
                                       sc->port_res);
                  sc->port_res = 0;
              }
                  DEVPRINTF(1, (dev, "CEM2/CEM3 port 0x%0lx, size 0x%0lx\n",
                      bus_get_resource_start(dev, SYS_RES_IOPORT, sc->port_rid),
                      bus_get_resource_count(dev, SYS_RES_IOPORT, sc->port_rid)));
          }
  
          if (!sc->port_res) {
                  DEVPRINTF(1, (dev, "Cannot allocate ioport\n"));
                  return ENOMEM;
          }
  
          sc->irq_rid = 0;
          sc->irq_res = bus_alloc_resource(dev, SYS_RES_IRQ, &sc->irq_rid, 
              0, ~0, 1, RF_ACTIVE);
          if (!sc->irq_res) {
                  DEVPRINTF(1, (dev, "Cannot allocate irq\n"));
                  xe_deactivate(dev);
                  return ENOMEM;
          }
          if ((err = bus_setup_intr(dev, sc->irq_res, INTR_TYPE_NET, xe_intr, sc,
              &sc->intrhand)) != 0) {
                  xe_deactivate(dev);
                  return err;
          }
  
          sc->bst = rman_get_bustag(sc->port_res);
          sc->bsh = rman_get_bushandle(sc->port_res);
          return (0);
  }
  
  void
  xe_deactivate(device_t dev)
  {
          struct xe_softc *sc = device_get_softc(dev);
          
          DEVPRINTF(2, (dev, "deactivate\n"));
          xe_disable_intr(sc);
  
          if (sc->intrhand)
                  bus_teardown_intr(dev, sc->irq_res, sc->intrhand);
          sc->intrhand = 0;
          if (sc->port_res)
                  bus_release_resource(dev, SYS_RES_IOPORT, sc->port_rid, 
                      sc->port_res);
          sc->port_res = 0;
          if (sc->ce2_port_res)
              bus_release_resource(dev, SYS_RES_IOPORT, sc->ce2_port_rid,
                                   sc->ce2_port_res);
          sc->ce2_port_res = 0;
          if (sc->irq_res)
                  bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid, 
                      sc->irq_res);
          sc->irq_res = 0;
          return;
  }

Cache object: 525958b32d62fa7f8501c0f8187bbcd4