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

     /*-
      * Copyright (c) 1998, 1999 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.
     *
     *      $Id: if_xe.c,v 1.20 1999/06/13 19:17:40 scott Exp $
     * $FreeBSD: releng/5.1/sys/dev/xe/if_xe.c 111119 2003-02-19 05:47:46Z imp $
     */
    
    /*
     * XXX TODO XXX
     *
     * I've pushed this fairly far, but there are some things that need to be
     * done here.  I'm documenting them here in case I get destracted. -- imp
     *
     * xe_cem56fix -- need to figure out how to map the extra stuff.
     */
    
    /*
     * 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.
     */
    
    /*              
     * 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.
     *
    * Contact points:
    *
    * Driver web page: http://ukug.uk.freebsd.org/~scott/xe_drv/
    *
    * Mailing list: http://www.lovett.com/lists/freebsd-xircom/
    * or send "subscribe freebsd-xircom" to <majordomo@lovett.com>
    *
    * Author email: <scott@uk.freebsd.org>
    */
   
   
   #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/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 */
   
   
   /*
    * 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_hard_reset          (struct xe_softc *scp);
   static void      xe_soft_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_setmulti            (struct xe_softc *scp);
   static void      xe_setaddrs            (struct xe_softc *scp);
   static int       xe_pio_write_packet    (struct xe_softc *scp, struct mbuf *mbp);
   static u_int32_t xe_compute_crc         (u_int8_t *data, int len) __unused;
   static int       xe_compute_hashbit     (u_int32_t crc) __unused;
   
   /*
    * 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);
   
   /*
    * Debug functions -- uncomment for VERY verbose dignostic information.
    * Set to 1 for less verbose information
    */
   /* #define XE_DEBUG 2 */
   #ifdef XE_DEBUG
   #define XE_REG_DUMP(scp)                xe_reg_dump((scp))
   #define XE_MII_DUMP(scp)                xe_mii_dump((scp))
   static void      xe_reg_dump            (struct xe_softc *scp);
   static void      xe_mii_dump            (struct xe_softc *scp);
   #else
   #define XE_REG_DUMP(scp)
   #define XE_MII_DUMP(scp)
   #endif
   
   /*
    * Attach a device.
    */
   int
   xe_attach (device_t dev)
   {
     struct xe_softc *scp = device_get_softc(dev);
   
   #ifdef XE_DEBUG
     device_printf(dev, "attach\n");
   #endif
   
     /* Fill in some private data */
     scp->ifp = &scp->arpcom.ac_if;
     scp->ifm = &scp->ifmedia;
     scp->autoneg_status = 0;
   
     /* Hopefully safe to read this here */
     XE_SELECT_PAGE(4);
     scp->version = XE_INB(XE_BOV);
   
     scp->dev = dev;
     /* Initialise the ifnet structure */
     if (!scp->ifp->if_name) {
       scp->ifp->if_softc = scp;
       scp->ifp->if_name = "xe";
       scp->ifp->if_unit = 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_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);
   
     /*
      * Fill in supported media types.  Some cards _do_ support full duplex
      * operation, but this driver doesn't, yet.  Therefore we leave those modes
      * out of the list.  We support some form of autoselection in all cases.
      */
     if (scp->mohawk) {
       ifmedia_add(scp->ifm, IFM_ETHER|IFM_100_TX, 0, NULL);
       ifmedia_add(scp->ifm, IFM_ETHER|IFM_10_T, 0, NULL);
     }
     else {
       ifmedia_add(scp->ifm, IFM_ETHER|IFM_10_T, 0, NULL);
       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);
   
     /* Print some useful information */
     device_printf(dev, "%s %s, bonding version %#x%s%s\n",
            scp->vendor,
            scp->card_type,
            scp->version,
            scp->mohawk ? ", 100Mbps capable" : "",
            scp->modem ?  ", with modem"      : "");
     if (scp->mohawk) {
       XE_SELECT_PAGE(0x10);
       device_printf(dev, "DingoID = %#x, RevisionID = %#x, VendorID = %#x\n",
              XE_INW(XE_DINGOID),
              XE_INW(XE_RevID),
              XE_INW(XE_VendorID));
     }
     if (scp->ce2) {
       XE_SELECT_PAGE(0x45);
       device_printf(dev, "CE2 version = %#x\n", XE_INB(XE_REV));
     }
   
     /* Print MAC address */
     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;
   }
   
   
   /*
    * Initialize device.  Completes the reset procedure on the card and starts
    * output.  If there's an autonegotiation in progress we DON'T do anything;
    * the media selection code will call us again when it's done.
    */
   static void
   xe_init(void *xscp) {
     struct xe_softc *scp = xscp;
     int s;
   
   #ifdef XE_DEBUG
     device_printf(scp->dev, "init\n");
   #endif
   
     if (TAILQ_EMPTY(&scp->ifp->if_addrhead)) return;
   
     /* Reset transmitter flags */
     scp->tx_queued = 0;
     scp->tx_tpr = 0;
     scp->tx_collisions = 0;
     scp->ifp->if_timer = 0;
   
     s = splimp();
   
     XE_SELECT_PAGE(0x42);
     XE_OUTB(XE_SWC0, 0x20);       /* Disable source insertion (WTF is that?) */
   
     /*
      * Set the 'local memory dividing line' -- splits the 32K card memory into
      * 8K for transmit buffers and 24K for receive.  This is done automatically
      * on newer revision cards.
      */
     if (scp->srev != 1) {
       XE_SELECT_PAGE(2);
       XE_OUTW(XE_RBS, 0x2000);
     }
   
     /* Set up multicast addresses */
     xe_setmulti(scp);
   
     /* Fix the data offset register -- reset leaves it off-by-one */
     XE_SELECT_PAGE(0);
     XE_OUTW(XE_DO, 0x2000);
   
     /*
      * Set MAC interrupt masks and clear status regs.  The bit names are direct
      * from the Linux code; I have no idea what most of them do.
      */
     XE_SELECT_PAGE(0x40);         /* Bit 7..0 */
     XE_OUTB(XE_RX0Msk, 0xff);     /* ROK, RAB, rsv, RO,  CRC, AE,  PTL, MP  */
     XE_OUTB(XE_TX0Msk, 0xff);     /* TOK, TAB, SQE, LL,  TU,  JAB, EXC, CRS */
     XE_OUTB(XE_TX0Msk+1, 0xb0);   /* rsv, rsv, PTD, EXT, rsv, rsv, rsv, rsv */
     XE_OUTB(XE_RST0, 0x00);       /* ROK, RAB, REN, RO,  CRC, AE,  PTL, MP  */
     XE_OUTB(XE_TXST0, 0x00);      /* TOK, TAB, SQE, LL,  TU,  JAB, EXC, CRS */
     XE_OUTB(XE_TXST1, 0x00);      /* TEN, rsv, PTD, EXT, retry_counter:4    */
   
     /*
      * Check for an in-progress autonegotiation.  If one is active, just set
      * IFF_RUNNING and return.  The media selection code will call us again when 
      * it's done.
      */
     if (scp->autoneg_status) {
       scp->ifp->if_flags |= IFF_RUNNING;
     }
     else {
       /* Enable receiver, 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);
   
       /* Attempt to start output */
       scp->ifp->if_flags |= IFF_RUNNING;
       scp->ifp->if_flags &= ~IFF_OACTIVE;
       xe_start(scp->ifp);
     }
   
     (void)splx(s);
   }
   
   
   /*
    * Start output on interface.  We make two assumptions here:
    *  1) that the current priority is set to splimp _before_ this code
    *     is called *and* is returned to the appropriate priority after
    *     return
    *  2) that the IFF_OACTIVE flag is checked before this code is called
    *     (i.e. that the output part of the interface is idle)
    */
   static void
   xe_start(struct ifnet *ifp) {
     struct xe_softc *scp = ifp->if_softc;
     struct mbuf *mbp;
   
     /*
      * Loop while there are packets to be sent, and space to send them.
      */
     while (1) {
       IF_DEQUEUE(&ifp->if_snd, mbp);      /* Suck a packet off the send queue */
   
       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) {
         IF_PREPEND(&ifp->if_snd, mbp);    /* Push the packet back onto the queue */
         ifp->if_flags |= IFF_OACTIVE;
         return;
       }
   
       /* Tap off here if there is a bpf listener */
       BPF_MTAP(ifp, mbp);
   
       ifp->if_timer = 5;                  /* In case we don't hear from the card again */
       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:
       /*
        * 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_hard_reset(scp);
           xe_setmedia(scp);
           xe_init(scp);
         }
       }
       else {
         if (ifp->if_flags & IFF_RUNNING)
           xe_stop(scp);
       }
   
      case SIOCADDMULTI:
      case SIOCDELMULTI:
       /*
        * Multicast list has (maybe) changed; set the hardware filter
        * accordingly.  This also serves to deal with promiscuous mode if we have 
        * a BPF listener active.
        */
       xe_setmulti(scp);
       error = 0;
       break;
   
      case SIOCSIFMEDIA:
      case SIOCGIFMEDIA:
       /*
        * Someone wants to get/set media options.
        */
       error = ifmedia_ioctl(ifp, (struct ifreq *)data, &scp->ifmedia, command);
       break;
   
      default:
       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;
     int result;
     u_int16_t rx_bytes, rxs, txs;
     u_int8_t psr, isr, esr, rsr;
   
     ifp = &scp->arpcom.ac_if;
     rx_bytes = 0;                 /* Bytes received on this interrupt */
     result = 0;                   /* Set true if the interrupt is for us */
   
     if (scp->mohawk) {
       XE_OUTB(XE_CR, 0);          /* Disable interrupts */
     }
   
     psr = XE_INB(XE_PR);          /* Stash the current register page */
   
     /*
      * Read ISR to see what caused this interrupt.  Note that this clears the
      * ISR on CE2 type cards.
      */
     if ((isr = XE_INB(XE_ISR)) && isr != 0xff) {
   
       result = 1;                 /* This device did generate an int */
       esr = XE_INB(XE_ESR);       /* Read the other status registers */
       XE_SELECT_PAGE(0x40);
       rxs = XE_INB(XE_RST0);
       XE_OUTB(XE_RST0, ~rxs & 0xff);
       txs = XE_INB(XE_TXST0);
       txs |= XE_INB(XE_TXST1) << 8;
       XE_OUTB(XE_TXST0, 0);
       XE_OUTB(XE_TXST1, 0);
       XE_SELECT_PAGE(0);
   
   #if XE_DEBUG > 2
       printf("xe%d: ISR=%#2.2x ESR=%#2.2x RST=%#2.2x TXST=%#4.4x\n", unit, isr, esr, rxs, txs);
   #endif
   
       /*
        * Handle transmit interrupts
        */
       if (isr & XE_ISR_TX_PACKET) {
         u_int8_t new_tpr, sent;
         
         if ((new_tpr = XE_INB(XE_TPR)) < scp->tx_tpr)     /* Update packet count */
           sent = (0xff - scp->tx_tpr) + new_tpr;          /* TPR rolled over */
         else
           sent = new_tpr - scp->tx_tpr;
   
         if (sent > 0) {                           /* Packets sent since last interrupt */
           scp->tx_tpr = new_tpr;
           scp->tx_queued -= sent;
           ifp->if_opackets += sent;
           ifp->if_collisions += scp->tx_collisions;
   
           /*
            * Collision stats are a PITA.  If multiples frames have been sent, we 
            * distribute any outstanding collision count equally amongst them.
            * However, if we're missing interrupts we're quite likely to also
            * miss some collisions; thus the total count will be off anyway.
            * Likewise, if we miss a frame dropped due to excessive collisions
            * any outstanding collisions count will be held against the next
            * frame to be successfully sent.  Hopefully it averages out in the
            * end!
            * XXX - This will screw up if tx_collisions/sent > 14. FIX IT!
            */
           switch (scp->tx_collisions) {
            case 0:
             break;
            case 1:
             scp->mibdata.dot3StatsSingleCollisionFrames++;
             scp->mibdata.dot3StatsCollFrequencies[0]++;
             break;
            default:
             if (sent == 1) {
               scp->mibdata.dot3StatsMultipleCollisionFrames++;
               scp->mibdata.dot3StatsCollFrequencies[scp->tx_collisions-1]++;
             }
             else {                /* Distribute across multiple frames */
               scp->mibdata.dot3StatsMultipleCollisionFrames += sent;
               scp->mibdata.
                 dot3StatsCollFrequencies[scp->tx_collisions/sent] += sent - scp->tx_collisions%sent;
               scp->mibdata.
                 dot3StatsCollFrequencies[scp->tx_collisions/sent + 1] += scp->tx_collisions%sent;
             }
           }
           scp->tx_collisions = 0;
         }
         ifp->if_timer = 0;
         ifp->if_flags &= ~IFF_OACTIVE;
       }
       if (txs & 0x0002) {         /* Excessive collisions (packet dropped) */
         ifp->if_collisions += 16;
         ifp->if_oerrors++;
         scp->tx_collisions = 0;
         scp->mibdata.dot3StatsExcessiveCollisions++;
         scp->mibdata.dot3StatsMultipleCollisionFrames++;
         scp->mibdata.dot3StatsCollFrequencies[15]++;
         XE_OUTB(XE_CR, XE_CR_RESTART_TX);
       }
       if (txs & 0x0040)           /* Transmit aborted -- probably collisions */
         scp->tx_collisions++;
   
   
       /*
        * Handle receive interrupts 
        */
       while ((esr = XE_INB(XE_ESR)) & XE_ESR_FULL_PACKET_RX) {
   
         if ((rsr = XE_INB(XE_RSR)) & XE_RSR_RX_OK) {
           struct ether_header *ehp;
           struct mbuf *mbp;
           u_int16_t len;
   
           len = XE_INW(XE_RBC);
   
           if (len == 0)
             continue;
   
   #if 0
           /*
            * Limit the amount of time we spend in this loop, dropping packets if 
            * necessary.  The Linux code does this with considerably more
            * finesse, adjusting the threshold dynamically.
            */
           if ((rx_bytes += len) > 22000) {
             ifp->if_iqdrops++;
             scp->mibData.dot3StatsMissedFrames++;
             XE_OUTW(XE_DO, 0x8000);
             continue;
           }
   #endif
   
           if (len & 0x01)
             len++;
   
           MGETHDR(mbp, M_DONTWAIT, MT_DATA);      /* Allocate a header mbuf */
           if (mbp != NULL) {
             mbp->m_pkthdr.rcvif = ifp;
             mbp->m_pkthdr.len = mbp->m_len = len;
   
             /*
              * If the mbuf header isn't big enough for the packet, attach an
              * mbuf cluster to hold it.  The +2 is to allow for the nasty little 
              * alignment hack below.
              */
             if (len + 2 > MHLEN) {
               MCLGET(mbp, M_DONTWAIT);
               if ((mbp->m_flags & M_EXT) == 0) {
                 m_freem(mbp);
                 mbp = NULL;
               }
             }
           }
   
           if (mbp != NULL) {
             /*
              * The Ethernet header is 14 bytes long; thus the actual packet data 
              * won't be 32-bit aligned when it's dumped into the mbuf.  We
              * offset everything by 2 bytes to fix this.  Apparently the
              * alignment is important for NFS, damn its eyes.
              */
             mbp->m_data += 2;
             ehp = mtod(mbp, struct ether_header *);
   
             /*
              * Now get the packet, including the Ethernet header and trailer (?)
              * We use programmed I/O, because we don't know how to do shared
              * memory with these cards.  So yes, it's real slow, and heavy on
              * the interrupts (CPU on my P150 maxed out at ~950KBps incoming).
              */
             if (scp->srev == 0) {         /* Workaround a bug in old cards */
               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;
   
                 /*
                  * XXX - This i-- seems very wrong, but it's what the Linux guys 
                  * XXX - do.  Need someone with an old CE2 to test this for me.
                  * XXX - 99/3/28: Changed the first i-- to an i++, maybe that'll
                  * XXX - fix it?  It seems as though the previous version would
                  * XXX - have caused an infinite loop (what, another one?).
                  */
                 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);
             }
             else
               bus_space_read_multi_2(scp->bst, scp->bsh, XE_EDP, 
                (u_int16_t *) ehp, len >> 1);
   
             /* Deliver packet to upper layers */
             if (mbp != NULL) {
               mbp->m_flags |= M_HASFCS;           /* FCS is included in our
                                                    * packet */
               mbp->m_pkthdr.len = mbp->m_len = len;
               (*ifp->if_input)(ifp, mbp);         /* Send the packet on its way */
               ifp->if_ipackets++;                 /* Success! */
             }
             XE_OUTW(XE_DO, 0x8000);               /* skip_rx_packet command */
           }
         }
         else if (rsr & XE_RSR_LONG_PACKET) {      /* Packet length >1518 bytes */
           scp->mibdata.dot3StatsFrameTooLongs++;
           ifp->if_ierrors++;
         }
         else if (rsr & XE_RSR_CRC_ERROR) {        /* Bad checksum on packet */
           scp->mibdata.dot3StatsFCSErrors++;
           ifp->if_ierrors++;
         }
         else if (rsr & XE_RSR_ALIGN_ERROR) {      /* Packet alignment error */
           scp->mibdata.dot3StatsAlignmentErrors++;
           ifp->if_ierrors++;
         }
       }
       if (rxs & 0x10) {                           /* Receiver overrun */
         scp->mibdata.dot3StatsInternalMacReceiveErrors++;
         ifp->if_ierrors++;
         XE_OUTB(XE_CR, XE_CR_CLEAR_OVERRUN);
       }
     }
   
     XE_SELECT_PAGE(psr);                          /* Restore saved page */
     XE_OUTB(XE_CR, XE_CR_ENABLE_INTR);            /* Re-enable interrupts */
   
     /* Could force an int here, instead of dropping packets? */
     /* XE_OUTB(XE_CR, XE_CR_ENABLE_INTR|XE_CE_FORCE_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_hard_reset(scp);
     xe_setmedia(scp);
     xe_init(scp);
   }
   
   
   /*
    * Change media selection.
    */
   static int
   xe_media_change(struct ifnet *ifp) {
     struct xe_softc *scp = ifp->if_softc;
   
   #ifdef XE_DEBUG
     if_printf(ifp, "media_change\n");
   #endif
   
     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) {
   
   #ifdef XE_DEBUG
     if_printf(ifp, "media_status\n");
   #endif
   
     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;
   
   #ifdef XE_DEBUG
     device_printf(scp->dev, "setmedia\n");
   #endif
   
     /* 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:
   #if XE_DEBUG > 1
         device_printf(scp->dev, "Waiting for idle transmitter\n");
   #endif
         scp->arpcom.ac_if.if_flags |= IFF_OACTIVE;
         scp->autoneg_status = XE_AUTONEG_WAITING;
         scp->chand = timeout(xe_setmedia, scp, hz * 2);
         return;
   
        case XE_AUTONEG_WAITING:
         xe_soft_reset(scp);
         if (scp->phy_ok) {
   #if XE_DEBUG > 1
           device_printf(scp->dev, "Starting autonegotiation\n");
   #endif
           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)) {
   #if XE_DEBUG > 1
           device_printf(scp->dev, "Autonegotiation complete!\n");
   #endif
           /*
            * 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 {
   #if XE_DEBUG > 1
           device_printf(scp->dev, "Autonegotiation failed; trying 100baseTX\n");
   #endif
           XE_MII_DUMP(scp);
           xe_soft_reset(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) {
   #if XE_DEBUG > 1
           device_printf(scp->dev, "Got 100baseTX link!\n");
   #endif
           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 {
   #if XE_DEBUG > 1
           device_printf(scp->dev, "Autonegotiation failed; disabling PHY\n");
   #endif
           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) {
  #if XE_DEBUG > 1
        device_printf(scp->dev, "Selecting 10baseX\n");
  #endif
        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 */
      xe_soft_reset(scp);
      if (scp->phy_ok) {
  #if XE_DEBUG > 1
        device_printf(scp->dev, "Selecting 100baseTX\n");
  #endif
        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 */
      xe_soft_reset(scp);
  #if XE_DEBUG > 1
      device_printf(scp->dev, "Selecting 10baseT\n");
  #endif
      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:
      xe_soft_reset(scp);
  #if XE_DEBUG > 1
      device_printf(scp->dev, "Selecting 10base2\n");
  #endif
      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. 
     */
  #if XE_DEBUG > 1
    device_printf(scp->dev, "Setting LEDs\n");
  #endif
    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? */
    scp->ifp->if_flags &= ~IFF_OACTIVE;
    xe_init(scp);
  }
  
  
  /*
   * Hard reset (power cycle) the card.
   */
  static void
  xe_hard_reset(struct xe_softc *scp) {
    int s;
  
  #ifdef XE_DEBUG
    device_printf(scp->dev, "hard_reset\n");
  #endif
  
    s = splimp();
  
    /*
     * Power cycle the card.
     */
    XE_SELECT_PAGE(4);
    XE_OUTB(XE_GPR1, 0);          /* Power off */
    DELAY(40000);
  
    if (scp->mohawk)
      XE_OUTB(XE_GPR1, 1);        /* And back on again */
    else
      XE_OUTB(XE_GPR1, 5);        /* Also set AIC bit, whatever that is */
    DELAY(40000);
    XE_SELECT_PAGE(0);
  
    (void)splx(s);
  }
  
  
  /*
   * Soft reset the card.  Also makes sure that the ML6692 and 10Mbit controller 
   * are powered up, sets the silicon revision number in softc, disables
   * interrupts and checks for the prescence of a 100Mbit PHY.  This should
   * leave us in a position where we can access the PHY and do media
   * selection. The function imposes a 0.5s delay while the hardware powers up.
   */
  static void
  xe_soft_reset(struct xe_softc *scp) {
    int s;
  
  #ifdef XE_DEBUG
    device_printf(scp->dev, "soft_reset\n");
  #endif
  
    s = splimp();
  
    /*
     * Reset the card, (again).
     */
    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, 0x0e);
    }
  
    /*
     * Wait for everything to wake up.
     */
    DELAY(500000);
  
    /*
     * Get silicon revision number.
     */
    XE_SELECT_PAGE(4);
    if (scp->mohawk)
      scp->srev = (XE_INB(XE_BOV) & 0x70) >> 4;
    else
      scp->srev = (XE_INB(XE_BOV) & 0x30) >> 4;
  #ifdef XE_DEBUG
    device_printf(scp->dev, "silicon revision = %d\n", scp->srev);
  #endif
    
    /*
     * Shut off interrupts.
     */
    xe_disable_intr(scp);
  
    /*
     * Check for PHY.
     */
    if (scp->mohawk) {
      scp->phy_ok = xe_mii_init(scp);
    }
  
    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;
  
  #ifdef XE_DEBUG
    device_printf(scp->dev, "stop\n");
  #endif
  
    s = splimp();
  
    /*
     * Shut off interrupts.
     */
    xe_disable_intr(scp);
  
    /*
     * Power down.
     */
    XE_SELECT_PAGE(4);
    XE_OUTB(XE_GPR1, 0);
    XE_SELECT_PAGE(0);
  
    /*
     * ~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 Ethernet interrupts from the card.
   */
  static void
  xe_enable_intr(struct xe_softc *scp) {
  #ifdef XE_DEBUG
    device_printf(scp->dev, "enable_intr\n");
  #endif
  
    XE_SELECT_PAGE(1);
    XE_OUTB(XE_IMR0, 0xff);               /* Unmask everything */
    XE_OUTB(XE_IMR1, 0x01);               /* Unmask TX underrun detection */
    DELAY(1);
  
    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 all Ethernet interrupts from the card.
   */
  static void
  xe_disable_intr(struct xe_softc *scp) {
  #ifdef XE_DEBUG
    device_printf(scp->dev, "disable_intr\n");
  #endif
  
    XE_SELECT_PAGE(0);
    XE_OUTB(XE_CR, 0);                    /* Disable interrupts */
    if (scp->modem && !scp->dingo) {      /* More magic (does this work?) */
      XE_OUTB(0x10, 0x10);                /* Mask the master int enable bit */
    }
  
    XE_SELECT_PAGE(1);
    XE_OUTB(XE_IMR0, 0);                  /* Forbid all interrupts */
    XE_OUTB(XE_IMR1, 0);
    XE_SELECT_PAGE(0);
  }
  
  
  /*
   * Set up multicast filter and promiscuous mode
   */
  static void
  xe_setmulti(struct xe_softc *scp) {
    struct ifnet *ifp;
    struct ifmultiaddr *maddr;
    int count;
  
    ifp = &scp->arpcom.ac_if;
    maddr = TAILQ_FIRST(&ifp->if_multiaddrs);
  
    /* Get length of multicast list */
    for (count = 0; maddr != NULL; maddr = TAILQ_NEXT(maddr, ifma_link), count++);
  
    if ((ifp->if_flags & IFF_PROMISC) || (ifp->if_flags & IFF_ALLMULTI) || (count > 9)) {
      /*
       * Go into promiscuous mode if either of the PROMISC or ALLMULTI flags are
       * set, or if we have been asked to deal with more than 9 multicast
       * addresses.  To do this: set MPE and PME in SWC1
       */
      XE_SELECT_PAGE(0x42);
      XE_OUTB(XE_SWC1, 0x06);
    }
    else if ((ifp->if_flags & IFF_MULTICAST) && (count > 0)) {
      /*
       * Program the filters for up to 9 addresses
       */
      XE_SELECT_PAGE(0x42);
      XE_OUTB(XE_SWC1, 0x01);
      XE_SELECT_PAGE(0x40);
      XE_OUTB(XE_CMD0, XE_CMD0_OFFLINE);
      /*xe_reg_dump(scp);*/
      xe_setaddrs(scp);
      /*xe_reg_dump(scp);*/
      XE_SELECT_PAGE(0x40);
      XE_OUTB(XE_CMD0, XE_CMD0_RX_ENABLE|XE_CMD0_ONLINE);
    }
    else {
      /*
       * No multicast operation (default)
       */
      XE_SELECT_PAGE(0x42);
      XE_OUTB(XE_SWC1, 0);
    }
    XE_SELECT_PAGE(0);
  }
  
  
  /*
   * Set up all on-chip addresses (for multicast).  AFAICS, there are 10
   * of these things; the first is our MAC address, the other 9 are mcast
   * addresses, padded with the MAC address if there aren't enough.
   * XXX - This doesn't work right, but I'm not sure why yet.  We seem to be
   * XXX - doing much the same as the Linux code, which is weird enough that
   * XXX - it's probably right (despite my earlier comments to the contrary).
   */
  static void
  xe_setaddrs(struct xe_softc *scp) {
    struct ifmultiaddr *maddr;
    u_int8_t *addr;
    u_int8_t page, slot, byte, i;
  
    maddr = TAILQ_FIRST(&scp->arpcom.ac_if.if_multiaddrs);
  
    XE_SELECT_PAGE(page = 0x50);
  
    for (slot = 0, byte = 8; slot < 10; slot++) {
  
      if (slot == 0)
        addr = (u_int8_t *)(&scp->arpcom.ac_enaddr);
      else {
        while (maddr != NULL && maddr->ifma_addr->sa_family != AF_LINK)
          maddr = TAILQ_NEXT(maddr, ifma_link);
        if (maddr != NULL)
          addr = LLADDR((struct sockaddr_dl *)maddr->ifma_addr);
        else
          addr = (u_int8_t *)(&scp->arpcom.ac_enaddr);
      }
  
      for (i = 0; i < 6; i++, byte++) {
  #if XE_DEBUG > 2
        if (i)
          printf(":%x", addr[i]);
        else
          device_printf(scp->dev, "individual addresses %d: %x", slot, addr[0]);
  #endif
  
        if (byte > 15) {
          page++;
          byte = 8;
          XE_SELECT_PAGE(page);
        }
  
        if (scp->mohawk)
          XE_OUTB(byte, addr[5 - i]);
        else
          XE_OUTB(byte, addr[i]);
      }
  #if XE_DEBUG > 2
      printf("\n");
  #endif
    }
  
    XE_SELECT_PAGE(0);
  }
  
  
  /*
   * Write an outgoing packet to the card using programmed I/O.
   */
  static int
  xe_pio_write_packet(struct xe_softc *scp, struct mbuf *mbp) {
    struct mbuf *mbp2;
    u_int16_t len, pad, free, ok;
    u_int8_t *data;
    u_int8_t savebyte[2], wantbyte;
  
    /* Get total packet length */
    for (len = 0, mbp2 = mbp; mbp2 != NULL; len += mbp2->m_len, mbp2 = mbp2->m_next);
  
    /* Packets < minimum length may need to be padded out */
    pad = 0;
    if (len < ETHER_MIN_LEN - ETHER_CRC_LEN) {
      pad = (ETHER_MIN_LEN - ETHER_CRC_LEN - len + 1) >> 1;
      len = ETHER_MIN_LEN - ETHER_CRC_LEN;
    }
  
    /* Check transmit buffer space */
    XE_SELECT_PAGE(0);
    XE_OUTW(XE_TRS, len+2);
    free = XE_INW(XE_TSO);
    ok = free & 0x8000;
    free &= 0x7fff;
    if (free <= 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;
    }
    if (wantbyte)                 /* Last byte for odd-length packets */
      XE_OUTW(XE_EDP, *(u_short *)savebyte);
  
    /*
     * For CE3 cards, just tell 'em to send -- apparently the card will pad out
     * short packets with random cruft.  Otherwise, write nonsense words to fill 
     * out the packet.  I guess it is then sent automatically (?)
     */
    if (scp->mohawk)
      XE_OUTB(XE_CR, XE_CR_TX_PACKET|XE_CR_ENABLE_INTR);
    else
      while (pad > 0) {
        XE_OUTW(XE_EDP, 0xdead);
        pad--;
      }
  
    return 0;
  }
  
  /*
   * Compute the 32-bit Ethernet CRC for the given buffer.
   */
  static u_int32_t
  xe_compute_crc(u_int8_t *data, int len) {
    u_int32_t crc = 0xffffffff;
    u_int32_t poly = 0x04c11db6;
    u_int8_t current, crc31, bit;
    int i, k;
  
    for (i = 0; i < len; i++) {
      current = data[i];
      for (k = 1; k <= 8; k++) {
        if (crc & 0x80000000) {
          crc31 = 0x01;
        }
        else {
          crc31 = 0;
        }
        bit = crc31 ^ (current & 0x01);
        crc <<= 1;
        current >>= 1;
        if (bit) {
          crc = (crc ^ poly)|1;
        }
      }
    }
    return 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.
   */
  static int
  xe_compute_hashbit(u_int32_t crc) {
    u_int8_t hashbit = 0;
    int i;
  
    for (i = 0; i < 6; i++) {
      hashbit >>= 1;
      if (crc & 0x80000000) {
        hashbit &= 0x80;
      }
      crc <<= 1;
    }
    return (hashbit >> 2);
  }
  
  
  
  /**************************************************************
   *                                                            *
   *                  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) {
  #if XE_DEBUG > 1
      device_printf(scp->dev, "no PHY found, %0x\n", status);
  #endif
      return 0;
    }
    else {
  #if XE_DEBUG > 1
      device_printf(scp->dev, "PHY OK!\n");
  #endif
  
      /* 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;
  }
  
  
  #ifdef XE_DEBUG
  /*
   * 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);
  }
  
  static 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;
  
          if (!sc->dingo) {
                  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 {
                  /*
                   * Find a 16 byte aligned ioport for the card.
                   */
  #if XE_DEBUG > 0
                  device_printf(dev, "Finding an aligned port for RealPort\n");
  #endif /* XE_DEBUG */
                  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);
  #if XE_DEBUG > 2
                  device_printf(dev, "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));
  #endif /* XE_DEBUG */
          }
          if (!sc->port_res) {
  #if XE_DEBUG > 0
                  device_printf(dev, "Cannot allocate ioport\n");
  #endif          
                  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) {
  #if XE_DEBUG > 0
                  device_printf(dev, "Cannot allocate irq\n");
  #endif
                  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);
          
          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->irq_res)
                  bus_release_resource(dev, SYS_RES_IRQ, sc->irq_rid, 
                      sc->irq_res);
          sc->irq_res = 0;
          return;
  }

Cache object: 5ce864eabd6facaa06a8847589ac6a35