FreeBSD/Linux Kernel Cross Reference
sys/pci/if_tl.c

     /*
      * Copyright (c) 1997, 1998
      *      Bill Paul <wpaul@ctr.columbia.edu>.  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.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Bill Paul.
     * 4. Neither the name of the author nor the names of any co-contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul OR THE VOICES IN HIS HEAD
     * 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: src/sys/pci/if_tl.c,v 1.16.2.10 1999/09/05 08:21:10 peter Exp $
     */
    
    /*
     * Texas Instruments ThunderLAN driver for FreeBSD 2.2.6 and 3.x.
     * Supports many Compaq PCI NICs based on the ThunderLAN ethernet controller,
     * the National Semiconductor DP83840A physical interface and the
     * Microchip Technology 24Cxx series serial EEPROM.
     *
     * Written using the following four documents:
     *
     * Texas Instruments ThunderLAN Programmer's Guide (www.ti.com)
     * National Semiconductor DP83840A data sheet (www.national.com)
     * Microchip Technology 24C02C data sheet (www.microchip.com)
     * Micro Linear ML6692 100BaseTX only PHY data sheet (www.microlinear.com)
     * 
     * Written by Bill Paul <wpaul@ctr.columbia.edu>
     * Electrical Engineering Department
     * Columbia University, New York City
     */
    
    /*
     * Some notes about the ThunderLAN:
     *
     * The ThunderLAN controller is a single chip containing PCI controller
     * logic, approximately 3K of on-board SRAM, a LAN controller, and media
     * independent interface (MII) bus. The MII allows the ThunderLAN chip to
     * control up to 32 different physical interfaces (PHYs). The ThunderLAN
     * also has a built-in 10baseT PHY, allowing a single ThunderLAN controller
     * to act as a complete ethernet interface.
     *
     * Other PHYs may be attached to the ThunderLAN; the Compaq 10/100 cards
     * use a National Semiconductor DP83840A PHY that supports 10 or 100Mb/sec
     * in full or half duplex. Some of the Compaq Deskpro machines use a
     * Level 1 LXT970 PHY with the same capabilities. Certain Olicom adapters
     * use a Micro Linear ML6692 100BaseTX only PHY, which can be used in
     * concert with the ThunderLAN's internal PHY to provide full 10/100
     * support. This is cheaper than using a standalone external PHY for both
     * 10/100 modes and letting the ThunderLAN's internal PHY go to waste.
     * A serial EEPROM is also attached to the ThunderLAN chip to provide
     * power-up default register settings and for storing the adapter's
     * station address. Although not supported by this driver, the ThunderLAN
     * chip can also be connected to token ring PHYs.
     *
     * The ThunderLAN has a set of registers which can be used to issue
     * commands, acknowledge interrupts, and to manipulate other internal
     * registers on its DIO bus. The primary registers can be accessed
     * using either programmed I/O (inb/outb) or via PCI memory mapping,
     * depending on how the card is configured during the PCI probing
     * phase. It is even possible to have both PIO and memory mapped
     * access turned on at the same time.
     * 
     * Frame reception and transmission with the ThunderLAN chip is done
     * using frame 'lists.' A list structure looks more or less like this:
     *
     * struct tl_frag {
     *      u_int32_t               fragment_address;
     *      u_int32_t               fragment_size;
     * };
     * struct tl_list {
     *      u_int32_t               forward_pointer;
     *      u_int16_t               cstat;
     *      u_int16_t               frame_size;
     *      struct tl_frag          fragments[10];
     * };
     *
     * The forward pointer in the list header can be either a 0 or the address
     * of another list, which allows several lists to be linked together. Each
    * list contains up to 10 fragment descriptors. This means the chip allows
    * ethernet frames to be broken up into up to 10 chunks for transfer to
    * and from the SRAM. Note that the forward pointer and fragment buffer
    * addresses are physical memory addresses, not virtual. Note also that
    * a single ethernet frame can not span lists: if the host wants to
    * transmit a frame and the frame data is split up over more than 10
    * buffers, the frame has to collapsed before it can be transmitted.
    *
    * To receive frames, the driver sets up a number of lists and populates
    * the fragment descriptors, then it sends an RX GO command to the chip.
    * When a frame is received, the chip will DMA it into the memory regions
    * specified by the fragment descriptors and then trigger an RX 'end of
    * frame interrupt' when done. The driver may choose to use only one
    * fragment per list; this may result is slighltly less efficient use
    * of memory in exchange for improving performance.
    *
    * To transmit frames, the driver again sets up lists and fragment
    * descriptors, only this time the buffers contain frame data that
    * is to be DMA'ed into the chip instead of out of it. Once the chip
    * has transfered the data into its on-board SRAM, it will trigger a
    * TX 'end of frame' interrupt. It will also generate an 'end of channel'
    * interrupt when it reaches the end of the list.
    */
   
   /*
    * Some notes about this driver:
    *
    * The ThunderLAN chip provides a couple of different ways to organize
    * reception, transmission and interrupt handling. The simplest approach
    * is to use one list each for transmission and reception. In this mode,
    * the ThunderLAN will generate two interrupts for every received frame
    * (one RX EOF and one RX EOC) and two for each transmitted frame (one
    * TX EOF and one TX EOC). This may make the driver simpler but it hurts
    * performance to have to handle so many interrupts.
    *
    * Initially I wanted to create a circular list of receive buffers so
    * that the ThunderLAN chip would think there was an infinitely long
    * receive channel and never deliver an RXEOC interrupt. However this
    * doesn't work correctly under heavy load: while the manual says the
    * chip will trigger an RXEOF interrupt each time a frame is copied into
    * memory, you can't count on the chip waiting around for you to acknowledge
    * the interrupt before it starts trying to DMA the next frame. The result
    * is that the chip might traverse the entire circular list and then wrap
    * around before you have a chance to do anything about it. Consequently,
    * the receive list is terminated (with a 0 in the forward pointer in the
    * last element). Each time an RXEOF interrupt arrives, the used list
    * is shifted to the end of the list. This gives the appearance of an
    * infinitely large RX chain so long as the driver doesn't fall behind
    * the chip and allow all of the lists to be filled up.
    *
    * If all the lists are filled, the adapter will deliver an RX 'end of
    * channel' interrupt when it hits the 0 forward pointer at the end of
    * the chain. The RXEOC handler then cleans out the RX chain and resets
    * the list head pointer in the ch_parm register and restarts the receiver.
    *
    * For frame transmission, it is possible to program the ThunderLAN's
    * transmit interrupt threshold so that the chip can acknowledge multiple
    * lists with only a single TX EOF interrupt. This allows the driver to
    * queue several frames in one shot, and only have to handle a total
    * two interrupts (one TX EOF and one TX EOC) no matter how many frames
    * are transmitted. Frame transmission is done directly out of the
    * mbufs passed to the tl_start() routine via the interface send queue.
    * The driver simply sets up the fragment descriptors in the transmit
    * lists to point to the mbuf data regions and sends a TX GO command.
    *
    * Note that since the RX and TX lists themselves are always used
    * only by the driver, the are malloc()ed once at driver initialization
    * time and never free()ed.
    *
    * Also, in order to remain as platform independent as possible, this
    * driver uses memory mapped register access to manipulate the card
    * as opposed to programmed I/O. This avoids the use of the inb/outb
    * (and related) instructions which are specific to the i386 platform.
    *
    * Using these techniques, this driver achieves very high performance
    * by minimizing the amount of interrupts generated during large
    * transfers and by completely avoiding buffer copies. Frame transfer
    * to and from the ThunderLAN chip is performed entirely by the chip
    * itself thereby reducing the load on the host CPU.
    */
   
   #include "bpfilter.h"
   
   #include <sys/param.h>
   #include <sys/systm.h>
   #include <sys/sockio.h>
   #include <sys/mbuf.h>
   #include <sys/malloc.h>
   #include <sys/kernel.h>
   #include <sys/socket.h>
   #include <sys/syslog.h>
   
   #include <net/if.h>
   #include <net/if_arp.h>
   #include <net/ethernet.h>
   #include <net/if_dl.h>
   #include <net/if_mib.h>
   #include <net/if_media.h>
   #include <net/if_types.h>
   
   #ifdef INET
   #include <netinet/in.h>
   #include <netinet/in_systm.h>
   #include <netinet/in_var.h>
   #include <netinet/ip.h>
   #include <netinet/if_ether.h>
   #endif
   
   #ifdef IPX
   #include <netipx/ipx.h>
   #include <netipx/ipx_if.h>
   #endif
   
   #ifdef NS
   #include <netns/ns.h>
   #include <netns/ns_if.h>
   #endif
   
   #if NBPFILTER > 0
   #include <net/bpf.h>
   #include <net/bpfdesc.h>
   #endif
   
   #include <vm/vm.h>              /* for vtophys */
   #include <vm/vm_param.h>        /* for vtophys */
   #include <vm/pmap.h>            /* for vtophys */
   #include <machine/clock.h>      /* for DELAY */
   
   #include <pci/pcireg.h>
   #include <pci/pcivar.h>
   
   /*
    * Default to using PIO register access mode to pacify certain
    * laptop docking stations with built-in ThunderLAN chips that
    * don't seem to handle memory mapped mode properly.
    */
   #define TL_USEIOSPACE
   
   /* #define TL_BACKGROUND_AUTONEG */
   
   #include <pci/if_tlreg.h>
   
   #if !defined(lint)
   static const char rcsid[] =
     "$FreeBSD: src/sys/pci/if_tl.c,v 1.16.2.10 1999/09/05 08:21:10 peter Exp $";
   #endif
   
   #ifdef TL_DEBUG
   #define EV_TXEOC 2
   #define EV_TXEOF 3
   #define EV_RXEOC 4
   #define EV_RXEOF 5
   #define EV_START_TX 6
   #define EV_START_Q 7
   #define EV_SETMODE 8
   #define EV_AUTONEG_XMIT 9
   #define EV_AUTONEG_FIN 10
   #define EV_START_TX_REAL 11
   #define EV_WATCHDOG 12
   #define EV_INIT 13
   
   static void evset(sc, e)
           struct tl_softc         *sc;
           int                     e;
   {
           int                     i;
   
           for (i = 19; i > 0; i--)
                   sc->tl_event[i] = sc->tl_event[i - 1];
           sc->tl_event[0] = e;
   
           return;
   }
   
   static void evshow(sc)
           struct tl_softc         *sc;
   {
           int                     i;
   
           printf("tl%d: events: ", sc->tl_unit);
           for (i = 0; i < 20; i++)
                   printf(" %d", sc->tl_event[i]);
           printf("\n");
   
           return;
   }
   #endif
   
   /*
    * Various supported device vendors/types and their names.
    */
   
   static struct tl_type tl_devs[] = {
           { TI_VENDORID,  TI_DEVICEID_THUNDERLAN,
                   "Texas Instruments ThunderLAN" },
           { COMPAQ_VENDORID, COMPAQ_DEVICEID_NETEL_10,
                   "Compaq Netelligent 10" },
           { COMPAQ_VENDORID, COMPAQ_DEVICEID_NETEL_10_100,
                   "Compaq Netelligent 10/100" },
           { COMPAQ_VENDORID, COMPAQ_DEVICEID_NETEL_10_100_PROLIANT,
                   "Compaq Netelligent 10/100 Proliant" },
           { COMPAQ_VENDORID, COMPAQ_DEVICEID_NETEL_10_100_DUAL,
                   "Compaq Netelligent 10/100 Dual Port" },
           { COMPAQ_VENDORID, COMPAQ_DEVICEID_NETFLEX_3P_INTEGRATED,
                   "Compaq NetFlex-3/P Integrated" },
           { COMPAQ_VENDORID, COMPAQ_DEVICEID_NETFLEX_3P,
                   "Compaq NetFlex-3/P" },
           { COMPAQ_VENDORID, COMPAQ_DEVICEID_NETFLEX_3P_BNC,
                   "Compaq NetFlex 3/P w/ BNC" },
           { COMPAQ_VENDORID, COMPAQ_DEVICEID_NETEL_10_100_EMBEDDED,
                   "Compaq Netelligent 10/100 TX Embedded UTP" },
           { COMPAQ_VENDORID, COMPAQ_DEVICEID_NETEL_10_T2_UTP_COAX,
                   "Compaq Netelligent 10 T/2 PCI UTP/Coax" },
           { COMPAQ_VENDORID, COMPAQ_DEVICEID_NETEL_10_100_TX_UTP,
                   "Compaq Netelligent 10/100 TX UTP" },
           { OLICOM_VENDORID, OLICOM_DEVICEID_OC2183,
                   "Olicom OC-2183/2185" },
           { OLICOM_VENDORID, OLICOM_DEVICEID_OC2325,
                   "Olicom OC-2325" },
           { OLICOM_VENDORID, OLICOM_DEVICEID_OC2326,
                   "Olicom OC-2326 10/100 TX UTP" },
           { 0, 0, NULL }
   };
   
   /*
    * Various supported PHY vendors/types and their names. Note that
    * this driver will work with pretty much any MII-compliant PHY,
    * so failure to positively identify the chip is not a fatal error.
    */
   
   static struct tl_type tl_phys[] = {
           { TI_PHY_VENDORID, TI_PHY_10BT, "<TI ThunderLAN 10BT (internal)>" },
           { TI_PHY_VENDORID, TI_PHY_100VGPMI, "<TI TNETE211 100VG Any-LAN>" },
           { NS_PHY_VENDORID, NS_PHY_83840A, "<National Semiconductor DP83840A>"},
           { LEVEL1_PHY_VENDORID, LEVEL1_PHY_LXT970, "<Level 1 LXT970>" }, 
           { INTEL_PHY_VENDORID, INTEL_PHY_82555, "<Intel 82555>" },
           { SEEQ_PHY_VENDORID, SEEQ_PHY_80220, "<SEEQ 80220>" },
           { 0, 0, "<MII-compliant physical interface>" }
   };
   
   static unsigned long            tl_count;
   
   static char *tl_probe           __P((pcici_t, pcidi_t));
   static void tl_attach           __P((pcici_t, int));
   static int tl_attach_phy        __P((struct tl_softc *));
   static int tl_intvec_rxeoc      __P((void *, u_int32_t));
   static int tl_intvec_txeoc      __P((void *, u_int32_t));
   static int tl_intvec_txeof      __P((void *, u_int32_t));
   static int tl_intvec_rxeof      __P((void *, u_int32_t));
   static int tl_intvec_adchk      __P((void *, u_int32_t));
   static int tl_intvec_netsts     __P((void *, u_int32_t));
   
   static int tl_newbuf            __P((struct tl_softc *,
                                           struct tl_chain_onefrag *));
   static void tl_stats_update     __P((void *));
   static int tl_encap             __P((struct tl_softc *, struct tl_chain *,
                                                   struct mbuf *));
   
   static void tl_intr             __P((void *));
   static void tl_start            __P((struct ifnet *));
   static int tl_ioctl             __P((struct ifnet *, int, caddr_t));
   static void tl_init             __P((void *));
   static void tl_stop             __P((struct tl_softc *));
   static void tl_watchdog         __P((struct ifnet *));
   static void tl_shutdown         __P((int, void *));
   static int tl_ifmedia_upd       __P((struct ifnet *));
   static void tl_ifmedia_sts      __P((struct ifnet *, struct ifmediareq *));
   
   static u_int8_t tl_eeprom_putbyte       __P((struct tl_softc *, int));
   static u_int8_t tl_eeprom_getbyte       __P((struct tl_softc *,
                                                   int, u_int8_t *));
   static int tl_read_eeprom       __P((struct tl_softc *, caddr_t, int, int));
   
   static void tl_mii_sync         __P((struct tl_softc *));
   static void tl_mii_send         __P((struct tl_softc *, u_int32_t, int));
   static int tl_mii_readreg       __P((struct tl_softc *, struct tl_mii_frame *));
   static int tl_mii_writereg      __P((struct tl_softc *, struct tl_mii_frame *));
   static u_int16_t tl_phy_readreg __P((struct tl_softc *, int));
   static void tl_phy_writereg     __P((struct tl_softc *, int, int));
   
   static void tl_autoneg          __P((struct tl_softc *, int, int));
   static void tl_setmode          __P((struct tl_softc *, int));
   static int tl_calchash          __P((caddr_t));
   static void tl_setmulti         __P((struct tl_softc *));
   static void tl_setfilt          __P((struct tl_softc *, caddr_t, int));
   static void tl_softreset        __P((struct tl_softc *, int));
   static void tl_hardreset        __P((struct tl_softc *));
   static int tl_list_rx_init      __P((struct tl_softc *));
   static int tl_list_tx_init      __P((struct tl_softc *));
   
   static u_int8_t tl_dio_read8    __P((struct tl_softc *, int));
   static u_int16_t tl_dio_read16  __P((struct tl_softc *, int));
   static u_int32_t tl_dio_read32  __P((struct tl_softc *, int));
   static void tl_dio_write8       __P((struct tl_softc *, int, int));
   static void tl_dio_write16      __P((struct tl_softc *, int, int));
   static void tl_dio_write32      __P((struct tl_softc *, int, int));
   static void tl_dio_setbit       __P((struct tl_softc *, int, int));
   static void tl_dio_clrbit       __P((struct tl_softc *, int, int));
   static void tl_dio_setbit16     __P((struct tl_softc *, int, int));
   static void tl_dio_clrbit16     __P((struct tl_softc *, int, int));
   
   static u_int8_t tl_dio_read8(sc, reg)
           struct tl_softc         *sc;
           int                     reg;
   {
           CSR_WRITE_2(sc, TL_DIO_ADDR, reg);
           return(CSR_READ_1(sc, TL_DIO_DATA + (reg & 3)));
   }
   
   static u_int16_t tl_dio_read16(sc, reg)
           struct tl_softc         *sc;
           int                     reg;
   {
           CSR_WRITE_2(sc, TL_DIO_ADDR, reg);
           return(CSR_READ_2(sc, TL_DIO_DATA + (reg & 3)));
   }
   
   static u_int32_t tl_dio_read32(sc, reg)
           struct tl_softc         *sc;
           int                     reg;
   {
           CSR_WRITE_2(sc, TL_DIO_ADDR, reg);
           return(CSR_READ_4(sc, TL_DIO_DATA + (reg & 3)));
   }
   
   static void tl_dio_write8(sc, reg, val)
           struct tl_softc         *sc;
           int                     reg;
           int                     val;
   {
           CSR_WRITE_2(sc, TL_DIO_ADDR, reg);
           CSR_WRITE_1(sc, TL_DIO_DATA + (reg & 3), val);
           return;
   }
   
   static void tl_dio_write16(sc, reg, val)
           struct tl_softc         *sc;
           int                     reg;
           int                     val;
   {
           CSR_WRITE_2(sc, TL_DIO_ADDR, reg);
           CSR_WRITE_2(sc, TL_DIO_DATA + (reg & 3), val);
           return;
   }
   
   static void tl_dio_write32(sc, reg, val)
           struct tl_softc         *sc;
           int                     reg;
           int                     val;
   {
           CSR_WRITE_2(sc, TL_DIO_ADDR, reg);
           CSR_WRITE_4(sc, TL_DIO_DATA + (reg & 3), val);
           return;
   }
   
   static void tl_dio_setbit(sc, reg, bit)
           struct tl_softc         *sc;
           int                     reg;
           int                     bit;
   {
           u_int8_t                        f;
   
           CSR_WRITE_2(sc, TL_DIO_ADDR, reg);
           f = CSR_READ_1(sc, TL_DIO_DATA + (reg & 3));
           f |= bit;
           CSR_WRITE_1(sc, TL_DIO_DATA + (reg & 3), f);
   
           return;
   }
   
   static void tl_dio_clrbit(sc, reg, bit)
           struct tl_softc         *sc;
           int                     reg;
           int                     bit;
   {
           u_int8_t                        f;
   
           CSR_WRITE_2(sc, TL_DIO_ADDR, reg);
           f = CSR_READ_1(sc, TL_DIO_DATA + (reg & 3));
           f &= ~bit;
           CSR_WRITE_1(sc, TL_DIO_DATA + (reg & 3), f);
   
           return;
   }
   
   static void tl_dio_setbit16(sc, reg, bit)
           struct tl_softc         *sc;
           int                     reg;
           int                     bit;
   {
           u_int16_t                       f;
   
           CSR_WRITE_2(sc, TL_DIO_ADDR, reg);
           f = CSR_READ_2(sc, TL_DIO_DATA + (reg & 3));
           f |= bit;
           CSR_WRITE_2(sc, TL_DIO_DATA + (reg & 3), f);
   
           return;
   }
   
   static void tl_dio_clrbit16(sc, reg, bit)
           struct tl_softc         *sc;
           int                     reg;
           int                     bit;
   {
           u_int16_t                       f;
   
           CSR_WRITE_2(sc, TL_DIO_ADDR, reg);
           f = CSR_READ_2(sc, TL_DIO_DATA + (reg & 3));
           f &= ~bit;
           CSR_WRITE_2(sc, TL_DIO_DATA + (reg & 3), f);
   
           return;
   }
   
   /*
    * Send an instruction or address to the EEPROM, check for ACK.
    */
   static u_int8_t tl_eeprom_putbyte(sc, byte)
           struct tl_softc         *sc;
           int                     byte;
   {
           register int            i, ack = 0;
   
           /*
            * Make sure we're in TX mode.
            */
           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_ETXEN);
   
           /*
            * Feed in each bit and stobe the clock.
            */
           for (i = 0x80; i; i >>= 1) {
                   if (byte & i) {
                           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_EDATA);
                   } else {
                           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_EDATA);
                   }
                   DELAY(1);
                   tl_dio_setbit(sc, TL_NETSIO, TL_SIO_ECLOK);
                   DELAY(1);
                   tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_ECLOK);
           }
   
           /*
            * Turn off TX mode.
            */
           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_ETXEN);
   
           /*
            * Check for ack.
            */
           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_ECLOK);
           ack = tl_dio_read8(sc, TL_NETSIO) & TL_SIO_EDATA;
           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_ECLOK);
   
           return(ack);
   }
   
   /*
    * Read a byte of data stored in the EEPROM at address 'addr.'
    */
   static u_int8_t tl_eeprom_getbyte(sc, addr, dest)
           struct tl_softc         *sc;
           int                     addr;
           u_int8_t                *dest;
   {
           register int            i;
           u_int8_t                byte = 0;
   
           tl_dio_write8(sc, TL_NETSIO, 0);
   
           EEPROM_START;
   
           /*
            * Send write control code to EEPROM.
            */
           if (tl_eeprom_putbyte(sc, EEPROM_CTL_WRITE)) {
                   printf("tl%d: failed to send write command, status: %x\n",
                                   sc->tl_unit, tl_dio_read8(sc, TL_NETSIO));
                   return(1);
           }
   
           /*
            * Send address of byte we want to read.
            */
           if (tl_eeprom_putbyte(sc, addr)) {
                   printf("tl%d: failed to send address, status: %x\n",
                                   sc->tl_unit, tl_dio_read8(sc, TL_NETSIO));
                   return(1);
           }
   
           EEPROM_STOP;
           EEPROM_START;
           /*
            * Send read control code to EEPROM.
            */
           if (tl_eeprom_putbyte(sc, EEPROM_CTL_READ)) {
                   printf("tl%d: failed to send write command, status: %x\n",
                                   sc->tl_unit, tl_dio_read8(sc, TL_NETSIO));
                   return(1);
           }
   
           /*
            * Start reading bits from EEPROM.
            */
           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_ETXEN);
           for (i = 0x80; i; i >>= 1) {
                   tl_dio_setbit(sc, TL_NETSIO, TL_SIO_ECLOK);
                   DELAY(1);
                   if (tl_dio_read8(sc, TL_NETSIO) & TL_SIO_EDATA)
                           byte |= i;
                   tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_ECLOK);
                   DELAY(1);
           }
   
           EEPROM_STOP;
   
           /*
            * No ACK generated for read, so just return byte.
            */
   
           *dest = byte;
   
           return(0);
   }
   
   /*
    * Read a sequence of bytes from the EEPROM.
    */
   static int tl_read_eeprom(sc, dest, off, cnt)
           struct tl_softc         *sc;
           caddr_t                 dest;
           int                     off;
           int                     cnt;
   {
           int                     err = 0, i;
           u_int8_t                byte = 0;
   
           for (i = 0; i < cnt; i++) {
                   err = tl_eeprom_getbyte(sc, off + i, &byte);
                   if (err)
                           break;
                   *(dest + i) = byte;
           }
   
           return(err ? 1 : 0);
   }
   
   static void tl_mii_sync(sc)
           struct tl_softc         *sc;
   {
           register int            i;
   
           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MTXEN);
   
           for (i = 0; i < 32; i++) {
                   tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MCLK);
                   tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MCLK);
           }
   
           return;
   }
   
   static void tl_mii_send(sc, bits, cnt)
           struct tl_softc         *sc;
           u_int32_t               bits;
           int                     cnt;
   {
           int                     i;
   
           for (i = (0x1 << (cnt - 1)); i; i >>= 1) {
                   tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MCLK);
                   if (bits & i) {
                           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MDATA);
                   } else {
                           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MDATA);
                   }
                   tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MCLK);
           }
   }
   
   static int tl_mii_readreg(sc, frame)
           struct tl_softc         *sc;
           struct tl_mii_frame     *frame;
           
   {
           int                     i, ack, s;
           int                     minten = 0;
   
           s = splimp();
   
           tl_mii_sync(sc);
   
           /*
            * Set up frame for RX.
            */
           frame->mii_stdelim = TL_MII_STARTDELIM;
           frame->mii_opcode = TL_MII_READOP;
           frame->mii_turnaround = 0;
           frame->mii_data = 0;
           
           /*
            * Turn off MII interrupt by forcing MINTEN low.
            */
           minten = tl_dio_read8(sc, TL_NETSIO) & TL_SIO_MINTEN;
           if (minten) {
                   tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MINTEN);
           }
   
           /*
            * Turn on data xmit.
            */
           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MTXEN);
   
           /*
            * Send command/address info.
            */
           tl_mii_send(sc, frame->mii_stdelim, 2);
           tl_mii_send(sc, frame->mii_opcode, 2);
           tl_mii_send(sc, frame->mii_phyaddr, 5);
           tl_mii_send(sc, frame->mii_regaddr, 5);
   
           /*
            * Turn off xmit.
            */
           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MTXEN);
   
           /* Idle bit */
           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MCLK);
           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MCLK);
   
           /* Check for ack */
           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MCLK);
           ack = tl_dio_read8(sc, TL_NETSIO) & TL_SIO_MDATA;
   
           /* Complete the cycle */
           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MCLK);
   
           /*
            * Now try reading data bits. If the ack failed, we still
            * need to clock through 16 cycles to keep the PHYs in sync.
            */
           if (ack) {
                   for(i = 0; i < 16; i++) {
                           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MCLK);
                           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MCLK);
                   }
                   goto fail;
           }
   
           for (i = 0x8000; i; i >>= 1) {
                   tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MCLK);
                   if (!ack) {
                           if (tl_dio_read8(sc, TL_NETSIO) & TL_SIO_MDATA)
                                   frame->mii_data |= i;
                   }
                   tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MCLK);
           }
   
   fail:
   
           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MCLK);
           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MCLK);
   
           /* Reenable interrupts */
           if (minten) {
                   tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MINTEN);
           }
   
           splx(s);
   
           if (ack)
                   return(1);
           return(0);
   }
   
   static int tl_mii_writereg(sc, frame)
           struct tl_softc         *sc;
           struct tl_mii_frame     *frame;
           
   {
           int                     s;
           int                     minten;
   
           tl_mii_sync(sc);
   
           s = splimp();
           /*
            * Set up frame for TX.
            */
   
           frame->mii_stdelim = TL_MII_STARTDELIM;
           frame->mii_opcode = TL_MII_WRITEOP;
           frame->mii_turnaround = TL_MII_TURNAROUND;
           
           /*
            * Turn off MII interrupt by forcing MINTEN low.
            */
           minten = tl_dio_read8(sc, TL_NETSIO) & TL_SIO_MINTEN;
           if (minten) {
                   tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MINTEN);
           }
   
           /*
            * Turn on data output.
            */
           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MTXEN);
   
           tl_mii_send(sc, frame->mii_stdelim, 2);
           tl_mii_send(sc, frame->mii_opcode, 2);
           tl_mii_send(sc, frame->mii_phyaddr, 5);
           tl_mii_send(sc, frame->mii_regaddr, 5);
           tl_mii_send(sc, frame->mii_turnaround, 2);
           tl_mii_send(sc, frame->mii_data, 16);
   
           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MCLK);
           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MCLK);
   
           /*
            * Turn off xmit.
            */
           tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MTXEN);
   
           /* Reenable interrupts */
           if (minten)
                   tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MINTEN);
   
           splx(s);
   
           return(0);
   }
   
   static u_int16_t tl_phy_readreg(sc, reg)
           struct tl_softc         *sc;
           int                     reg;
   {
           struct tl_mii_frame     frame;
   
           bzero((char *)&frame, sizeof(frame));
   
           frame.mii_phyaddr = sc->tl_phy_addr;
           frame.mii_regaddr = reg;
           tl_mii_readreg(sc, &frame);
   
           /* Reenable MII interrupts, just in case. */
           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MINTEN);
   
           return(frame.mii_data);
   }
   
   static void tl_phy_writereg(sc, reg, data)
           struct tl_softc         *sc;
           int                     reg;
           int                     data;
   {
           struct tl_mii_frame     frame;
   
           bzero((char *)&frame, sizeof(frame));
   
           frame.mii_phyaddr = sc->tl_phy_addr;
           frame.mii_regaddr = reg;
           frame.mii_data = data;
   
           tl_mii_writereg(sc, &frame);
   
           /* Reenable MII interrupts, just in case. */
           tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MINTEN);
   
           return;
   }
   
   /*
    * Initiate autonegotiation with a link partner.
    *
    * Note that the Texas Instruments ThunderLAN programmer's guide
    * fails to mention one very important point about autonegotiation.
    * Autonegotiation is done largely by the PHY, independent of the
    * ThunderLAN chip itself: the PHY sets the flags in the BMCR
    * register to indicate what modes were selected and if link status
    * is good. In fact, the PHY does pretty much all of the work itself,
    * except for one small detail.
    *
    * The PHY may negotiate a full-duplex of half-duplex link, and set
    * the PHY_BMCR_DUPLEX bit accordingly, but the ThunderLAN's 'NetCommand'
    * register _also_ has a half-duplex/full-duplex bit, and you MUST ALSO
    * SET THIS BIT MANUALLY TO CORRESPOND TO THE MODE SELECTED FOR THE PHY!
    * In other words, both the ThunderLAN chip and the PHY have to be
    * programmed for full-duplex mode in order for full-duplex to actually
    * work. So in order for autonegotiation to really work right, we have
    * to wait for the link to come up, check the BMCR register, then set
    * the ThunderLAN for full or half-duplex as needed.
    *
    * I struggled for two days to figure this out, so I'm making a point
    * of drawing attention to this fact. I think it's very strange that
    * the ThunderLAN doesn't automagically track the duplex state of the
    * PHY, but there you have it.
    *
    * Also when, using a National Semiconductor DP83840A PHY, we have to
    * allow a full three seconds for autonegotiation to complete. So what
    * we do is flip the autonegotiation restart bit, then set a timeout
    * to wake us up in three seconds to check the link state.
    *
    * Note that there are some versions of the Olicom 2326 that use a
    * Micro Linear ML6692 100BaseTX PHY. This particular PHY is designed
    * to provide 100BaseTX support only, but can be used with a controller
    * that supports an internal 10Mbps PHY to provide a complete
    * 10/100Mbps solution. However, the ML6692 does not have vendor and
    * device ID registers, and hence always shows up with a vendor/device
    * ID of 0.
    *
    * We detect this configuration by checking the phy vendor ID in the
    * softc structure. If it's a zero, and we're negotiating a high-speed
    * mode, then we turn off the internal PHY. If it's a zero and we've
    * negotiated a high-speed mode, we turn on the internal PHY. Note
    * that to make things even more fun, we have to make extra sure that
    * the loopback bit in the internal PHY's control register is turned
    * off.
    */
   static void tl_autoneg(sc, flag, verbose)
           struct tl_softc         *sc;
           int                     flag;
           int                     verbose;
   {
           u_int16_t               phy_sts = 0, media = 0, advert, ability;
           struct ifnet            *ifp;
           struct ifmedia          *ifm;
   
           ifm = &sc->ifmedia;
           ifp = &sc->arpcom.ac_if;
   
           /*
            * First, see if autoneg is supported. If not, there's
            * no point in continuing.
            */
           phy_sts = tl_phy_readreg(sc, PHY_BMSR);
           if (!(phy_sts & PHY_BMSR_CANAUTONEG)) {
                   if (verbose)
                           printf("tl%d: autonegotiation not supported\n",
                                                           sc->tl_unit);
                   return;
           }
   
           switch (flag) {
           case TL_FLAG_FORCEDELAY:
                   /*
                    * XXX Never use this option anywhere but in the probe
                    * routine: making the kernel stop dead in its tracks
                    * for three whole seconds after we've gone multi-user
                    * is really bad manners.
                    */
                   tl_phy_writereg(sc, PHY_BMCR, PHY_BMCR_RESET);
                   DELAY(500);
                   phy_sts = tl_phy_readreg(sc, PHY_BMCR);
                   phy_sts |= PHY_BMCR_AUTONEGENBL|PHY_BMCR_AUTONEGRSTR;
                   tl_phy_writereg(sc, PHY_BMCR, phy_sts);
                   DELAY(5000000);
                   break;
           case TL_FLAG_SCHEDDELAY:
   #ifdef TL_DEBUG
                   evset(sc, EV_AUTONEG_XMIT);
   #endif
                   /*
                    * Wait for the transmitter to go idle before starting
                    * an autoneg session, otherwise tl_start() may clobber
                    * our timeout, and we don't want to allow transmission
                    * during an autoneg session since that can screw it up.
                    */
                   if (!sc->tl_txeoc) {
                           sc->tl_want_auto = 1;
                           return;
                   }
                   tl_phy_writereg(sc, PHY_BMCR, PHY_BMCR_RESET);
                   DELAY(500);
                   phy_sts = tl_phy_readreg(sc, PHY_BMCR);
                   phy_sts |= PHY_BMCR_AUTONEGENBL|PHY_BMCR_AUTONEGRSTR;
                   tl_phy_writereg(sc, PHY_BMCR, phy_sts);
                   ifp->if_timer = 5;
                   sc->tl_autoneg = 1;
                   sc->tl_want_auto = 0;
                   return;
           case TL_FLAG_DELAYTIMEO:
   #ifdef TL_DEBUG
                   evset(sc, EV_AUTONEG_FIN);
   #endif
                   ifp->if_timer = 0;
                   sc->tl_autoneg = 0;
                   break;
           default:
                   printf("tl%d: invalid autoneg flag: %d\n", sc->tl_unit, flag);
                   return;
           }
   
           /*
            * Read the BMSR register twice: the LINKSTAT bit is a
            * latching bit.
            */
           tl_phy_readreg(sc, PHY_BMSR);
           phy_sts = tl_phy_readreg(sc, PHY_BMSR);
           if (phy_sts & PHY_BMSR_AUTONEGCOMP) {
                  if (verbose)
                          printf("tl%d: autoneg complete, ", sc->tl_unit);
                  phy_sts = tl_phy_readreg(sc, PHY_BMSR);
          } else {
                  if (verbose)
                          printf("tl%d: autoneg not complete, ", sc->tl_unit);
          }
  
          /* Link is good. Report modes and set duplex mode. */
          if (phy_sts & PHY_BMSR_LINKSTAT) {
                  if (verbose)
                          printf("link status good ");
  
                  advert = tl_phy_readreg(sc, TL_PHY_ANAR);
                  ability = tl_phy_readreg(sc, TL_PHY_LPAR);
                  media = tl_phy_readreg(sc, PHY_BMCR);
  
                  /*
                   * Be sure to turn off the ISOLATE and
                   * LOOPBACK bits in the control register,
                   * otherwise we may not be able to communicate.
                   */
                  media &= ~(PHY_BMCR_LOOPBK|PHY_BMCR_ISOLATE);
                  /* Set the DUPLEX bit in the NetCmd register accordingly. */
                  if (advert & PHY_ANAR_100BT4 && ability & PHY_ANAR_100BT4) {
                          ifm->ifm_media = IFM_ETHER|IFM_100_T4;
                          media |= PHY_BMCR_SPEEDSEL;
                          media &= ~PHY_BMCR_DUPLEX;
                          if (verbose)
                                  printf("(100baseT4)\n");
                  } else if (advert & PHY_ANAR_100BTXFULL &&
                          ability & PHY_ANAR_100BTXFULL) {
                          ifm->ifm_media = IFM_ETHER|IFM_100_TX|IFM_FDX;
                          media |= PHY_BMCR_SPEEDSEL;
                          media |= PHY_BMCR_DUPLEX;
                          if (verbose)
                                  printf("(full-duplex, 100Mbps)\n");
                  } else if (advert & PHY_ANAR_100BTXHALF &&
                          ability & PHY_ANAR_100BTXHALF) {
                          ifm->ifm_media = IFM_ETHER|IFM_100_TX|IFM_HDX;
                          media |= PHY_BMCR_SPEEDSEL;
                          media &= ~PHY_BMCR_DUPLEX;
                          if (verbose)
                                  printf("(half-duplex, 100Mbps)\n");
                  } else if (advert & PHY_ANAR_10BTFULL &&
                          ability & PHY_ANAR_10BTFULL) {
                          ifm->ifm_media = IFM_ETHER|IFM_10_T|IFM_FDX;
                          media &= ~PHY_BMCR_SPEEDSEL;
                          media |= PHY_BMCR_DUPLEX;
                          if (verbose)
                                  printf("(full-duplex, 10Mbps)\n");
                  } else {
                          ifm->ifm_media = IFM_ETHER|IFM_10_T|IFM_HDX;
                          media &= ~PHY_BMCR_SPEEDSEL;
                          media &= ~PHY_BMCR_DUPLEX;
                          if (verbose)
                                  printf("(half-duplex, 10Mbps)\n");
                  }
  
                  if (media & PHY_BMCR_DUPLEX)
                          tl_dio_setbit(sc, TL_NETCMD, TL_CMD_DUPLEX);
                  else
                          tl_dio_clrbit(sc, TL_NETCMD, TL_CMD_DUPLEX);
  
                  media &= ~PHY_BMCR_AUTONEGENBL;
                  tl_phy_writereg(sc, PHY_BMCR, media);
          } else {
                  if (verbose)
                          printf("no carrier\n");
          }
  
          tl_init(sc);
  
          if (sc->tl_tx_pend) {
                  sc->tl_autoneg = 0;
                  sc->tl_tx_pend = 0;
                  tl_start(ifp);
          }
  
          return;
  }
  
  /*
   * Set speed and duplex mode. Also program autoneg advertisements
   * accordingly.
   */
  static void tl_setmode(sc, media)
          struct tl_softc         *sc;
          int                     media;
  {
          u_int16_t               bmcr;
  
          bmcr = tl_phy_readreg(sc, PHY_BMCR);
  
          bmcr &= ~(PHY_BMCR_SPEEDSEL|PHY_BMCR_DUPLEX|PHY_BMCR_AUTONEGENBL|
                    PHY_BMCR_LOOPBK|PHY_BMCR_ISOLATE);
  
          if (IFM_SUBTYPE(media) == IFM_LOOP)
                  bmcr |= PHY_BMCR_LOOPBK;
  
          if (IFM_SUBTYPE(media) == IFM_AUTO)
                  bmcr |= PHY_BMCR_AUTONEGENBL;
  
          /*
           * The ThunderLAN's internal PHY has an AUI transceiver
           * that can be selected. This is usually attached to a
           * 10base2/BNC port. In order to activate this port, we
           * have to set the AUISEL bit in the internal PHY's
           * special control register.
           */
          if (IFM_SUBTYPE(media) == IFM_10_5) {
                  u_int16_t               addr, ctl;
                  addr = sc->tl_phy_addr;
                  sc->tl_phy_addr = TL_PHYADDR_MAX;
                  ctl = tl_phy_readreg(sc, TL_PHY_CTL);
                  ctl |= PHY_CTL_AUISEL;
                  tl_phy_writereg(sc, TL_PHY_CTL, ctl);
                  tl_phy_writereg(sc, PHY_BMCR, bmcr);
                  sc->tl_phy_addr = addr;
                  bmcr |= PHY_BMCR_ISOLATE;
          } else {
                  u_int16_t               addr, ctl;
                  addr = sc->tl_phy_addr;
                  sc->tl_phy_addr = TL_PHYADDR_MAX;
                  ctl = tl_phy_readreg(sc, TL_PHY_CTL);
                  ctl &= ~PHY_CTL_AUISEL;
                  tl_phy_writereg(sc, TL_PHY_CTL, ctl);
                  tl_phy_writereg(sc, PHY_BMCR, PHY_BMCR_ISOLATE);
                  sc->tl_phy_addr = addr;
                  bmcr &= ~PHY_BMCR_ISOLATE;
          }
  
          if (IFM_SUBTYPE(media) == IFM_100_TX) {
                  bmcr |= PHY_BMCR_SPEEDSEL;
                  if ((media & IFM_GMASK) == IFM_FDX) {
                          bmcr |= PHY_BMCR_DUPLEX;
                          tl_dio_setbit(sc, TL_NETCMD, TL_CMD_DUPLEX);
                  } else {
                          bmcr &= ~PHY_BMCR_DUPLEX;
                          tl_dio_clrbit(sc, TL_NETCMD, TL_CMD_DUPLEX);
                  }
          }
  
          if (IFM_SUBTYPE(media) == IFM_10_T) {
                  bmcr &= ~PHY_BMCR_SPEEDSEL;
                  if ((media & IFM_GMASK) == IFM_FDX) {
                          bmcr |= PHY_BMCR_DUPLEX;
                          tl_dio_setbit(sc, TL_NETCMD, TL_CMD_DUPLEX);
                  } else {
                          bmcr &= ~PHY_BMCR_DUPLEX;
                          tl_dio_clrbit(sc, TL_NETCMD, TL_CMD_DUPLEX);
                  }
          }
  
          tl_phy_writereg(sc, PHY_BMCR, bmcr);
  
          tl_init(sc);
  
          return;
  }
  
  /*
   * Calculate the hash of a MAC address for programming the multicast hash
   * table.  This hash is simply the address split into 6-bit chunks
   * XOR'd, e.g.
   * byte: 000000|00 1111|1111 22|222222|333333|33 4444|4444 55|555555
   * bit:  765432|10 7654|3210 76|543210|765432|10 7654|3210 76|543210
   * Bytes 0-2 and 3-5 are symmetrical, so are folded together.  Then
   * the folded 24-bit value is split into 6-bit portions and XOR'd.
   */
  static int tl_calchash(addr)
          caddr_t                 addr;
  {
          int                     t;
  
          t = (addr[0] ^ addr[3]) << 16 | (addr[1] ^ addr[4]) << 8 |
                  (addr[2] ^ addr[5]);
          return ((t >> 18) ^ (t >> 12) ^ (t >> 6) ^ t) & 0x3f;
  }
  
  /*
   * The ThunderLAN has a perfect MAC address filter in addition to
   * the multicast hash filter. The perfect filter can be programmed
   * with up to four MAC addresses. The first one is always used to
   * hold the station address, which leaves us free to use the other
   * three for multicast addresses.
   */
  static void tl_setfilt(sc, addr, slot)
          struct tl_softc         *sc;
          caddr_t                 addr;
          int                     slot;
  {
          int                     i;
          u_int16_t               regaddr;
  
          regaddr = TL_AREG0_B5 + (slot * ETHER_ADDR_LEN);
  
          for (i = 0; i < ETHER_ADDR_LEN; i++)
                  tl_dio_write8(sc, regaddr + i, *(addr + i));
  
          return;
  }
  
  static void tl_setmulti(sc)
          struct tl_softc         *sc;
  {
          struct ifnet            *ifp;
          u_int32_t               hashes[2] = { 0, 0 };
          int                     h, i;
          struct ether_multi      *enm;
          struct ether_multistep  step;
          u_int8_t                dummy[] = { 0, 0, 0, 0, 0, 0 };
  
          ifp = &sc->arpcom.ac_if;
  
          /* First, zot all the existing filters. */
          for (i = 1; i < 4; i++)
                  tl_setfilt(sc, (caddr_t)&dummy, i);
          tl_dio_write32(sc, TL_HASH1, 0);
          tl_dio_write32(sc, TL_HASH2, 0);
  
          /* Now program new ones. */
          if (ifp->if_flags & IFF_ALLMULTI) {
                  hashes[0] = 0xFFFFFFFF;
                  hashes[1] = 0xFFFFFFFF;
          } else {
                  i = 1;
                  ETHER_FIRST_MULTI(step, &sc->arpcom, enm);
                  while(enm != NULL) {
                          if (bcmp(enm->enm_addrlo, enm->enm_addrhi,
                                                  ETHER_ADDR_LEN)) {
                                  hashes[0] = 0xFFFFFFFF;
                                  hashes[1] = 0xFFFFFFFF;
                                  break;
                          } else {
                                  /*
                                   * Program the first three multicast groups
                                   * into the perfect filter. For all others,
                                   * use the hash table.
                                   */
                                  if (i < 4) {
                                          tl_setfilt(sc, enm->enm_addrlo, i);
                                          i++;
                                          ETHER_NEXT_MULTI(step, enm);
                                          continue;
                                  }
  
                                  h = tl_calchash(enm->enm_addrlo);
                                  if (h < 32)
                                          hashes[0] |= (1 << h);
                                  else
                                          hashes[1] |= (1 << (h - 32));
                          }
                          ETHER_NEXT_MULTI(step, enm);
                  }
          }
  
          tl_dio_write32(sc, TL_HASH1, hashes[0]);
          tl_dio_write32(sc, TL_HASH2, hashes[1]);
  
          return;
  }
  
  /*
   * This routine is recommended by the ThunderLAN manual to insure that
   * the internal PHY is powered up correctly. It also recommends a one
   * second pause at the end to 'wait for the clocks to start' but in my
   * experience this isn't necessary.
   */
  static void tl_hardreset(sc)
          struct tl_softc         *sc;
  {
          int                     i;
          u_int16_t               old_addr, flags;
  
          old_addr = sc->tl_phy_addr;
  
          for (i = 0; i < TL_PHYADDR_MAX + 1; i++) {
                  sc->tl_phy_addr = i;
                  tl_mii_sync(sc);
          }
  
          flags = PHY_BMCR_LOOPBK|PHY_BMCR_ISOLATE|PHY_BMCR_PWRDOWN;
  
          for (i = 0; i < TL_PHYADDR_MAX + 1; i++) {
                  sc->tl_phy_addr = i;
                  tl_phy_writereg(sc, PHY_BMCR, flags);
          }
  
          sc->tl_phy_addr = TL_PHYADDR_MAX;
          tl_phy_writereg(sc, PHY_BMCR, PHY_BMCR_ISOLATE);
  
          DELAY(50000);
  
          tl_phy_writereg(sc, PHY_BMCR, PHY_BMCR_LOOPBK|PHY_BMCR_ISOLATE);
  
          tl_mii_sync(sc);
  
          while(tl_phy_readreg(sc, PHY_BMCR) & PHY_BMCR_RESET);
  
          sc->tl_phy_addr = old_addr;
  
          return;
  }
  
  static void tl_softreset(sc, internal)
          struct tl_softc         *sc;
          int                     internal;
  {
          u_int32_t               cmd, dummy, i;
  
          /* Assert the adapter reset bit. */
          CMD_SET(sc, TL_CMD_ADRST);
          /* Turn off interrupts */
          CMD_SET(sc, TL_CMD_INTSOFF);
  
          /* First, clear the stats registers. */
          for (i = 0; i < 5; i++)
                  dummy = tl_dio_read32(sc, TL_TXGOODFRAMES);
  
          /* Clear Areg and Hash registers */
          for (i = 0; i < 8; i++)
                  tl_dio_write32(sc, TL_AREG0_B5, 0x00000000);
  
          /*
           * Set up Netconfig register. Enable one channel and
           * one fragment mode.
           */
          tl_dio_setbit16(sc, TL_NETCONFIG, TL_CFG_ONECHAN|TL_CFG_ONEFRAG);
          if (internal) {
                  tl_dio_setbit16(sc, TL_NETCONFIG, TL_CFG_PHYEN);
          } else {
                  tl_dio_clrbit16(sc, TL_NETCONFIG, TL_CFG_PHYEN);
          }
  
          /* Set PCI burst size */
          tl_dio_write8(sc, TL_BSIZEREG, 0x33);
  
          /*
           * Load adapter irq pacing timer and tx threshold.
           * We make the transmit threshold 1 initially but we may
           * change that later.
           */
          cmd = CSR_READ_4(sc, TL_HOSTCMD);
          cmd |= TL_CMD_NES;
          cmd &= ~(TL_CMD_RT|TL_CMD_EOC|TL_CMD_ACK_MASK|TL_CMD_CHSEL_MASK);
          CMD_PUT(sc, cmd | (TL_CMD_LDTHR | TX_THR));
          CMD_PUT(sc, cmd | (TL_CMD_LDTMR | 0x00000003));
  
          /* Unreset the MII */
          tl_dio_setbit(sc, TL_NETSIO, TL_SIO_NMRST);
  
          /* Clear status register */
          tl_dio_setbit16(sc, TL_NETSTS, TL_STS_MIRQ);
          tl_dio_setbit16(sc, TL_NETSTS, TL_STS_HBEAT);
          tl_dio_setbit16(sc, TL_NETSTS, TL_STS_TXSTOP);
          tl_dio_setbit16(sc, TL_NETSTS, TL_STS_RXSTOP);
  
          /* Enable network status interrupts for everything. */
          tl_dio_setbit(sc, TL_NETMASK, TL_MASK_MASK7|TL_MASK_MASK6|
                          TL_MASK_MASK5|TL_MASK_MASK4);
  
          /* Take the adapter out of reset */
          tl_dio_setbit(sc, TL_NETCMD, TL_CMD_NRESET|TL_CMD_NWRAP);
  
          /* Wait for things to settle down a little. */
          DELAY(500);
  
          return;
  }
  
  /*
   * Probe for a ThunderLAN chip. Check the PCI vendor and device IDs
   * against our list and return its name if we find a match.
   */
  static char *
  tl_probe(config_id, device_id)
          pcici_t                 config_id;
          pcidi_t                 device_id;
  {
          struct tl_type          *t;
  
          t = tl_devs;
  
          while(t->tl_name != NULL) {
                  if ((device_id & 0xFFFF) == t->tl_vid &&
                      ((device_id >> 16) & 0xFFFF) == t->tl_did)
                          return(t->tl_name);
                  t++;
          }
  
          return(NULL);
  }
  
  /*
   * Do the interface setup and attach for a PHY on a particular
   * ThunderLAN chip. Also also set up interrupt vectors.
   */ 
  static int tl_attach_phy(sc)
          struct tl_softc         *sc;
  {
          int                     phy_ctl;
          struct tl_type          *p = tl_phys;
          int                     media = IFM_ETHER|IFM_100_TX|IFM_FDX;
          struct ifnet            *ifp;
  
          ifp = &sc->arpcom.ac_if;
  
          sc->tl_phy_did = tl_phy_readreg(sc, TL_PHY_DEVID);
          sc->tl_phy_vid = tl_phy_readreg(sc, TL_PHY_VENID);
          sc->tl_phy_sts = tl_phy_readreg(sc, TL_PHY_GENSTS);
          phy_ctl = tl_phy_readreg(sc, TL_PHY_GENCTL);
  
          /*
           * PHY revision numbers tend to vary a bit. Our algorithm here
           * is to check everything but the 8 least significant bits.
           */
          while(p->tl_vid) {
                  if (sc->tl_phy_vid  == p->tl_vid &&
                          (sc->tl_phy_did | 0x000F) == p->tl_did) {
                          sc->tl_pinfo = p;
                          break;
                  }
                  p++;
          }
          if (sc->tl_pinfo == NULL) {
                  sc->tl_pinfo = &tl_phys[PHY_UNKNOWN];
          }
  
          if (sc->tl_phy_sts & PHY_BMSR_100BT4 ||
                  sc->tl_phy_sts & PHY_BMSR_100BTXFULL ||
                  sc->tl_phy_sts & PHY_BMSR_100BTXHALF)
                  ifp->if_baudrate = 100000000;
          else
                  ifp->if_baudrate = 10000000;
  
          if (bootverbose) {
                  printf("tl%d: phy at mii address %d\n", sc->tl_unit,
                                                          sc->tl_phy_addr);
  
                  printf("tl%d: %s ", sc->tl_unit, sc->tl_pinfo->tl_name);
          }
  
          if (sc->tl_phy_sts & PHY_BMSR_100BT4 ||
                  sc->tl_phy_sts & PHY_BMSR_100BTXHALF ||
                  sc->tl_phy_sts & PHY_BMSR_100BTXHALF)
                  if (bootverbose)
                          printf("10/100Mbps ");
          else {
                  media &= ~IFM_100_TX;
                  media |= IFM_10_T;
                  if (bootverbose)
                          printf("10Mbps ");
          }
  
          if (sc->tl_phy_sts & PHY_BMSR_100BTXFULL ||
                  sc->tl_phy_sts & PHY_BMSR_10BTFULL)
                  if (bootverbose)
                          printf("full duplex ");
          else {
                  if (bootverbose)
                          printf("half duplex ");
                  media &= ~IFM_FDX;
          }
  
          if (sc->tl_phy_sts & PHY_BMSR_CANAUTONEG) {
                  media = IFM_ETHER|IFM_AUTO;
                  if (bootverbose)
                          printf("autonegotiating\n");
          } else
                  if (bootverbose)
                          printf("\n");
  
          /* If this isn't a known PHY, print the PHY indentifier info. */
          if (sc->tl_pinfo->tl_vid == 0 && bootverbose)
                  printf("tl%d: vendor id: %04x product id: %04x\n",
                          sc->tl_unit, sc->tl_phy_vid, sc->tl_phy_did);
  
          /* Set up ifmedia data and callbacks. */
          ifmedia_init(&sc->ifmedia, 0, tl_ifmedia_upd, tl_ifmedia_sts);
  
          /*
           * All ThunderLANs support at least 10baseT half duplex.
           * They also support AUI selection if used in 10Mb/s modes.
           */
          ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_10_T|IFM_HDX, 0, NULL);
          ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_10_T, 0, NULL);
          ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_10_5, 0, NULL);
  
          /* Some ThunderLAN PHYs support autonegotiation. */
          if (sc->tl_phy_sts & PHY_BMSR_CANAUTONEG)
                  ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_AUTO, 0, NULL);
  
          /* Some support 10baseT full duplex. */
          if (sc->tl_phy_sts & PHY_BMSR_10BTFULL)
                  ifmedia_add(&sc->ifmedia,
                          IFM_ETHER|IFM_10_T|IFM_FDX, 0, NULL);
  
          /* Some support 100BaseTX half duplex. */
          if (sc->tl_phy_sts & PHY_BMSR_100BTXHALF)
                  ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_100_TX, 0, NULL);
          if (sc->tl_phy_sts & PHY_BMSR_100BTXHALF)
                  ifmedia_add(&sc->ifmedia,
                          IFM_ETHER|IFM_100_TX|IFM_HDX, 0, NULL);
  
          /* Some support 100BaseTX full duplex. */
          if (sc->tl_phy_sts & PHY_BMSR_100BTXFULL)
                  ifmedia_add(&sc->ifmedia,
                          IFM_ETHER|IFM_100_TX|IFM_FDX, 0, NULL);
  
          /* Some also support 100BaseT4. */
          if (sc->tl_phy_sts & PHY_BMSR_100BT4)
                  ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_100_T4, 0, NULL);
  
          /* Set default media. */
          ifmedia_set(&sc->ifmedia, media);
  
          /*
           * Kick off an autonegotiation session if this PHY supports it.
           * This is necessary to make sure the chip's duplex mode matches
           * the PHY's duplex mode. It may not: once enabled, the PHY may
           * autonegotiate full-duplex mode with its link partner, but the
           * ThunderLAN chip defaults to half-duplex and stays there unless
           * told otherwise.
           */
          if (sc->tl_phy_sts & PHY_BMSR_CANAUTONEG) {
                  tl_init(sc);
  #ifdef TL_BACKGROUND_AUTONEG
                  tl_autoneg(sc, TL_FLAG_SCHEDDELAY, 1);
  #else
                  tl_autoneg(sc, TL_FLAG_FORCEDELAY, 1);
  #endif
          }
  
          return(0);
  }
  
  static void
  tl_attach(config_id, unit)
          pcici_t                 config_id;
          int                     unit;
  {
          int                     s, i, phys = 0;
  #ifndef TL_USEIOSPACE
          vm_offset_t             pbase, vbase;
  #endif
          u_int32_t               command;
          u_int16_t               did, vid;
          struct tl_type          *t;
          struct ifnet            *ifp;
          struct tl_softc         *sc;
          unsigned int            round;
          caddr_t                 roundptr;
  
          s = splimp();
  
          vid = pci_conf_read(config_id, PCI_ID_REG) & 0xFFFF;
          did = (pci_conf_read(config_id, PCI_ID_REG) >> 16) & 0xFFFF;
  
          t = tl_devs;
          while(t->tl_name != NULL) {
                  if (vid == t->tl_vid && did == t->tl_did)
                          break;
                  t++;
          }
  
          if (t->tl_name == NULL) {
                  printf("tl%d: unknown device!?\n", unit);
                  goto fail;
          }
  
          /* First, allocate memory for the softc struct. */
          sc = malloc(sizeof(struct tl_softc), M_DEVBUF, M_NOWAIT);
          if (sc == NULL) {
                  printf("tl%d: no memory for softc struct!\n", unit);
                  goto fail;
          }
  
          bzero(sc, sizeof(struct tl_softc));
  
          /*
           * Map control/status registers.
           */
          command = pci_conf_read(config_id, PCI_COMMAND_STATUS_REG);
          command |= (PCI_COMMAND_IO_ENABLE|PCI_COMMAND_MEM_ENABLE|
                          PCI_COMMAND_MASTER_ENABLE);
          pci_conf_write(config_id, PCI_COMMAND_STATUS_REG, command);
          command = pci_conf_read(config_id, PCI_COMMAND_STATUS_REG);
  
  #ifdef TL_USEIOSPACE
          if (!(command & PCI_COMMAND_IO_ENABLE)) {
                  printf("tl%d: failed to enable I/O ports!\n", unit);
                  free(sc, M_DEVBUF);
                  goto fail;
          }
  
          sc->iobase = pci_conf_read(config_id, TL_PCI_LOIO) & 0xFFFFFFFC;
  #else
          if (!(command & PCI_COMMAND_MEM_ENABLE)) {
                  printf("tl%d: failed to enable memory mapping!\n", unit);
                  goto fail;
          }
  
          if (!pci_map_mem(config_id, TL_PCI_LOMEM, &vbase, &pbase)) {
                  printf ("tl%d: couldn't map memory\n", unit);
                  goto fail;
          }
  
          sc->csr = (volatile caddr_t)vbase;
  #endif
  
  #ifdef notdef
          /*
           * The ThunderLAN manual suggests jacking the PCI latency
           * timer all the way up to its maximum value. I'm not sure
           * if this is really necessary, but what the manual wants,
           * the manual gets.
           */
          command = pci_conf_read(config_id, TL_PCI_LATENCY_TIMER);
          command |= 0x0000FF00;
          pci_conf_write(config_id, TL_PCI_LATENCY_TIMER, command);
  #endif
  
          /* Allocate interrupt */
          if (!pci_map_int(config_id, tl_intr, sc, &net_imask)) {
                  printf("tl%d: couldn't map interrupt\n", unit);
                  goto fail;
          }
  
          /*
           * Now allocate memory for the TX and RX lists. Note that
           * we actually allocate 8 bytes more than we really need:
           * this is because we need to adjust the final address to
           * be aligned on a quadword (64-bit) boundary in order to
           * make the chip happy. If the list structures aren't properly
           * aligned, DMA fails and the chip generates an adapter check
           * interrupt and has to be reset. If you set up the softc struct
           * just right you can sort of obtain proper alignment 'by chance.'
           * But I don't want to depend on this, so instead the alignment
           * is forced here.
           */
          sc->tl_ldata_ptr = malloc(sizeof(struct tl_list_data) + 8,
                                  M_DEVBUF, M_NOWAIT);
  
          if (sc->tl_ldata_ptr == NULL) {
                  free(sc, M_DEVBUF);
                  printf("tl%d: no memory for list buffers!\n", unit);
                  goto fail;
          }
  
          /*
           * Convoluted but satisfies my ANSI sensibilities. GCC lets
           * you do casts on the LHS of an assignment, but ANSI doesn't
           * allow that.
           */
          sc->tl_ldata = (struct tl_list_data *)sc->tl_ldata_ptr;
          round = (unsigned int)sc->tl_ldata_ptr & 0xF;
          roundptr = sc->tl_ldata_ptr;
          for (i = 0; i < 8; i++) {
                  if (round % 8) {
                          round++;
                          roundptr++;
                  } else
                          break;
          }
          sc->tl_ldata = (struct tl_list_data *)roundptr;
  
          bzero(sc->tl_ldata, sizeof(struct tl_list_data));
  
          sc->tl_unit = unit;
          sc->tl_dinfo = t;
          if (t->tl_vid == COMPAQ_VENDORID || t->tl_vid == TI_VENDORID)
                  sc->tl_eeaddr = TL_EEPROM_EADDR;
          if (t->tl_vid == OLICOM_VENDORID)
                  sc->tl_eeaddr = TL_EEPROM_EADDR_OC;
  
          /* Reset the adapter. */
          tl_softreset(sc, 1);
          tl_hardreset(sc);
          tl_softreset(sc, 1);
  
          /*
           * Get station address from the EEPROM.
           */
          if (tl_read_eeprom(sc, (caddr_t)&sc->arpcom.ac_enaddr,
                                  sc->tl_eeaddr, ETHER_ADDR_LEN)) {
                  printf("tl%d: failed to read station address\n", unit);
                  goto fail;
          }
  
          /*
           * XXX Olicom, in its desire to be different from the
           * rest of the world, has done strange things with the
           * encoding of the station address in the EEPROM. First
           * of all, they store the address at offset 0xF8 rather
           * than at 0x83 like the ThunderLAN manual suggests.
           * Second, they store the address in three 16-bit words in
           * network byte order, as opposed to storing it sequentially
           * like all the other ThunderLAN cards. In order to get
           * the station address in a form that matches what the Olicom
           * diagnostic utility specifies, we have to byte-swap each
           * word. To make things even more confusing, neither 00:00:28
           * nor 00:00:24 appear in the IEEE OUI database.
           */
          if (sc->tl_dinfo->tl_vid == OLICOM_VENDORID) {
                  for (i = 0; i < ETHER_ADDR_LEN; i += 2) {
                          u_int16_t               *p;
                          p = (u_int16_t *)&sc->arpcom.ac_enaddr[i];
                          *p = ntohs(*p);
                  }
          }
  
          /*
           * A ThunderLAN chip was detected. Inform the world.
           */
          printf("tl%d: Ethernet address: %6D\n", unit,
                                  sc->arpcom.ac_enaddr, ":");
  
          ifp = &sc->arpcom.ac_if;
          ifp->if_softc = sc;
          ifp->if_unit = sc->tl_unit;
          ifp->if_name = "tl";
          ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
          ifp->if_ioctl = tl_ioctl;
          ifp->if_output = ether_output;
          ifp->if_start = tl_start;
          ifp->if_watchdog = tl_watchdog;
          ifp->if_init = tl_init;
          ifp->if_mtu = ETHERMTU;
  
          /* Reset the adapter again. */
          tl_softreset(sc, 1);
          tl_hardreset(sc);
          tl_softreset(sc, 1);
  
          /*
           * Now attach the ThunderLAN's PHYs. There will always
           * be at least one PHY; if the PHY address is 0x1F, then
           * it's the internal one.
           */
  
          for (i = TL_PHYADDR_MIN; i < TL_PHYADDR_MAX + 1; i++) {
                  sc->tl_phy_addr = i;
                  if (bootverbose)
                          printf("tl%d: looking for phy at addr %x\n", unit, i);
                  tl_phy_writereg(sc, PHY_BMCR, PHY_BMCR_RESET);
                  DELAY(500);
                  while(tl_phy_readreg(sc, PHY_BMCR) & PHY_BMCR_RESET);
                  sc->tl_phy_sts = tl_phy_readreg(sc, PHY_BMSR);
                  if (bootverbose)
                          printf("tl%d: status: %x\n", unit, sc->tl_phy_sts);
                  if (!sc->tl_phy_sts)
                          continue;
                  if (tl_attach_phy(sc)) {
                          printf("tl%d: failed to attach a phy %d\n", unit, i);
                          goto fail;
                  }
                  phys++;
                  if (phys && i != TL_PHYADDR_MAX)
                          break;
          }
  
          if (!phys) {
                  printf("tl%d: no physical interfaces attached!\n", unit);
                  goto fail;
          }
  
          tl_intvec_adchk((void *)sc, 0);
          tl_stop(sc);
  
          /*
           * Attempt to clear any stray interrupts
           * that may be lurking.
           */
          tl_intr((void *)sc);
  
          /*
           * Call MI attach routines.
           */
          if_attach(ifp);
          ether_ifattach(ifp);
  
  #if NBPFILTER > 0
          bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
  #endif
  
          at_shutdown(tl_shutdown, sc, SHUTDOWN_POST_SYNC);
  
  fail:
          splx(s);
          return;
  }
  
  /*
   * Initialize the transmit lists.
   */
  static int tl_list_tx_init(sc)
          struct tl_softc         *sc;
  {
          struct tl_chain_data    *cd;
          struct tl_list_data     *ld;
          int                     i;
  
          cd = &sc->tl_cdata;
          ld = sc->tl_ldata;
          for (i = 0; i < TL_TX_LIST_CNT; i++) {
                  cd->tl_tx_chain[i].tl_ptr = &ld->tl_tx_list[i];
                  if (i == (TL_TX_LIST_CNT - 1))
                          cd->tl_tx_chain[i].tl_next = NULL;
                  else
                          cd->tl_tx_chain[i].tl_next = &cd->tl_tx_chain[i + 1];
          }
  
          cd->tl_tx_free = &cd->tl_tx_chain[0];
          cd->tl_tx_tail = cd->tl_tx_head = NULL;
          sc->tl_txeoc = 1;
  
          return(0);
  }
  
  /*
   * Initialize the RX lists and allocate mbufs for them.
   */
  static int tl_list_rx_init(sc)
          struct tl_softc         *sc;
  {
          struct tl_chain_data    *cd;
          struct tl_list_data     *ld;
          int                     i;
  
          cd = &sc->tl_cdata;
          ld = sc->tl_ldata;
  
          for (i = 0; i < TL_RX_LIST_CNT; i++) {
                  cd->tl_rx_chain[i].tl_ptr =
                          (struct tl_list_onefrag *)&ld->tl_rx_list[i];
                  if (tl_newbuf(sc, &cd->tl_rx_chain[i]) == ENOBUFS)
                          return(ENOBUFS);
                  if (i == (TL_RX_LIST_CNT - 1)) {
                          cd->tl_rx_chain[i].tl_next = NULL;
                          ld->tl_rx_list[i].tlist_fptr = 0;
                  } else {
                          cd->tl_rx_chain[i].tl_next = &cd->tl_rx_chain[i + 1];
                          ld->tl_rx_list[i].tlist_fptr =
                                          vtophys(&ld->tl_rx_list[i + 1]);
                  }
          }
  
          cd->tl_rx_head = &cd->tl_rx_chain[0];
          cd->tl_rx_tail = &cd->tl_rx_chain[TL_RX_LIST_CNT - 1];
  
          return(0);
  }
  
  static int tl_newbuf(sc, c)
          struct tl_softc         *sc;
          struct tl_chain_onefrag *c;
  {
          struct mbuf             *m_new = NULL;
  
          MGETHDR(m_new, M_DONTWAIT, MT_DATA);
          if (m_new == NULL) {
                  printf("tl%d: no memory for rx list -- packet dropped!",
                                  sc->tl_unit);
                  return(ENOBUFS);
          }
  
          MCLGET(m_new, M_DONTWAIT);
          if (!(m_new->m_flags & M_EXT)) {
                  printf("tl%d: no memory for rx list -- packet dropped!",
                                   sc->tl_unit);
                  m_freem(m_new);
                  return(ENOBUFS);
          }
  
          c->tl_mbuf = m_new;
          c->tl_next = NULL;
          c->tl_ptr->tlist_frsize = MCLBYTES;
          c->tl_ptr->tlist_cstat = TL_CSTAT_READY;
          c->tl_ptr->tlist_fptr = 0;
          c->tl_ptr->tl_frag.tlist_dadr = vtophys(mtod(m_new, caddr_t));
          c->tl_ptr->tl_frag.tlist_dcnt = MCLBYTES;
  
          return(0);
  }
  /*
   * Interrupt handler for RX 'end of frame' condition (EOF). This
   * tells us that a full ethernet frame has been captured and we need
   * to handle it.
   *
   * Reception is done using 'lists' which consist of a header and a
   * series of 10 data count/data address pairs that point to buffers.
   * Initially you're supposed to create a list, populate it with pointers
   * to buffers, then load the physical address of the list into the
   * ch_parm register. The adapter is then supposed to DMA the received
   * frame into the buffers for you.
   *
   * To make things as fast as possible, we have the chip DMA directly
   * into mbufs. This saves us from having to do a buffer copy: we can
   * just hand the mbufs directly to ether_input(). Once the frame has
   * been sent on its way, the 'list' structure is assigned a new buffer
   * and moved to the end of the RX chain. As long we we stay ahead of
   * the chip, it will always think it has an endless receive channel.
   *
   * If we happen to fall behind and the chip manages to fill up all of
   * the buffers, it will generate an end of channel interrupt and wait
   * for us to empty the chain and restart the receiver.
   */
  static int tl_intvec_rxeof(xsc, type)
          void                    *xsc;
          u_int32_t               type;
  {
          struct tl_softc         *sc;
          int                     r = 0, total_len = 0;
          struct ether_header     *eh;
          struct mbuf             *m;
          struct ifnet            *ifp;
          struct tl_chain_onefrag *cur_rx;
  
          sc = xsc;
          ifp = &sc->arpcom.ac_if;
  
  #ifdef TL_DEBUG
          evset(sc, EV_RXEOF);
  #endif
  
          while(sc->tl_cdata.tl_rx_head->tl_ptr->tlist_cstat & TL_CSTAT_FRAMECMP){
                  r++;
                  cur_rx = sc->tl_cdata.tl_rx_head;
                  sc->tl_cdata.tl_rx_head = cur_rx->tl_next;
                  m = cur_rx->tl_mbuf;
                  total_len = cur_rx->tl_ptr->tlist_frsize;
  
                  if (tl_newbuf(sc, cur_rx) == ENOBUFS) {
                          ifp->if_ierrors++;
                          cur_rx->tl_ptr->tlist_frsize = MCLBYTES;
                          cur_rx->tl_ptr->tlist_cstat = TL_CSTAT_READY;
                          cur_rx->tl_ptr->tl_frag.tlist_dcnt = MCLBYTES;
                          continue;
                  }
  
                  sc->tl_cdata.tl_rx_tail->tl_ptr->tlist_fptr =
                                                  vtophys(cur_rx->tl_ptr);
                  sc->tl_cdata.tl_rx_tail->tl_next = cur_rx;
                  sc->tl_cdata.tl_rx_tail = cur_rx;
  
                  eh = mtod(m, struct ether_header *);
                  m->m_pkthdr.rcvif = ifp;
  
                  /*
                   * Note: when the ThunderLAN chip is in 'capture all
                   * frames' mode, it will receive its own transmissions.
                   * We drop don't need to process our own transmissions,
                   * so we drop them here and continue.
                   */
                  /*if (ifp->if_flags & IFF_PROMISC && */
                  if (!bcmp(eh->ether_shost, sc->arpcom.ac_enaddr,
                                                          ETHER_ADDR_LEN)) {
                                  m_freem(m);
                                  continue;
                  }
  
  #if NBPFILTER > 0
                  /*
                   * Handle BPF listeners. Let the BPF user see the packet, but
                   * don't pass it up to the ether_input() layer unless it's
                   * a broadcast packet, multicast packet, matches our ethernet
                   * address or the interface is in promiscuous mode. If we don't
                   * want the packet, just forget it. We leave the mbuf in place
                   * since it can be used again later.
                   */
                  if (ifp->if_bpf) {
                          m->m_pkthdr.len = m->m_len = total_len;
                          bpf_mtap(ifp, m);
                          if (ifp->if_flags & IFF_PROMISC &&
                                  (bcmp(eh->ether_dhost, sc->arpcom.ac_enaddr,
                                                  ETHER_ADDR_LEN) &&
                                          (eh->ether_dhost[0] & 1) == 0)) {
                                  m_freem(m);
                                  continue;
                          }
                  }
  #endif
                  /* Remove header from mbuf and pass it on. */
                  m->m_pkthdr.len = m->m_len =
                                  total_len - sizeof(struct ether_header);
                  m->m_data += sizeof(struct ether_header);
                  ether_input(ifp, eh, m);
          }
  
          return(r);
  }
  
  /*
   * The RX-EOC condition hits when the ch_parm address hasn't been
   * initialized or the adapter reached a list with a forward pointer
   * of 0 (which indicates the end of the chain). In our case, this means
   * the card has hit the end of the receive buffer chain and we need to
   * empty out the buffers and shift the pointer back to the beginning again.
   */
  static int tl_intvec_rxeoc(xsc, type)
          void                    *xsc;
          u_int32_t               type;
  {
          struct tl_softc         *sc;
          int                     r;
  
          sc = xsc;
  
  #ifdef TL_DEBUG
          evset(sc, EV_RXEOC);
  #endif
  
          /* Flush out the receive queue and ack RXEOF interrupts. */
          r = tl_intvec_rxeof(xsc, type);
          CMD_PUT(sc, TL_CMD_ACK | r | (type & ~(0x00100000)));
          r = 1;
          CSR_WRITE_4(sc, TL_CH_PARM, vtophys(sc->tl_cdata.tl_rx_head->tl_ptr));
          r |= (TL_CMD_GO|TL_CMD_RT);
          return(r);
  }
  
  static int tl_intvec_txeof(xsc, type)
          void                    *xsc;
          u_int32_t               type;
  {
          struct tl_softc         *sc;
          int                     r = 0;
          struct tl_chain         *cur_tx;
  
          sc = xsc;
  
  #ifdef TL_DEBUG
          evset(sc, EV_TXEOF);
  #endif
  
          /*
           * Go through our tx list and free mbufs for those
           * frames that have been sent.
           */
          while (sc->tl_cdata.tl_tx_head != NULL) {
                  cur_tx = sc->tl_cdata.tl_tx_head;
                  if (!(cur_tx->tl_ptr->tlist_cstat & TL_CSTAT_FRAMECMP))
                          break;
                  sc->tl_cdata.tl_tx_head = cur_tx->tl_next;
  
                  r++;
                  m_freem(cur_tx->tl_mbuf);
                  cur_tx->tl_mbuf = NULL;
  
                  cur_tx->tl_next = sc->tl_cdata.tl_tx_free;
                  sc->tl_cdata.tl_tx_free = cur_tx;
                  if (!cur_tx->tl_ptr->tlist_fptr)
                          break;
          }
  
          return(r);
  }
  
  /*
   * The transmit end of channel interrupt. The adapter triggers this
   * interrupt to tell us it hit the end of the current transmit list.
   *
   * A note about this: it's possible for a condition to arise where
   * tl_start() may try to send frames between TXEOF and TXEOC interrupts.
   * You have to avoid this since the chip expects things to go in a
   * particular order: transmit, acknowledge TXEOF, acknowledge TXEOC.
   * When the TXEOF handler is called, it will free all of the transmitted
   * frames and reset the tx_head pointer to NULL. However, a TXEOC
   * interrupt should be received and acknowledged before any more frames
   * are queued for transmission. If tl_statrt() is called after TXEOF
   * resets the tx_head pointer but _before_ the TXEOC interrupt arrives,
   * it could attempt to issue a transmit command prematurely.
   *
   * To guard against this, tl_start() will only issue transmit commands
   * if the tl_txeoc flag is set, and only the TXEOC interrupt handler
   * can set this flag once tl_start() has cleared it.
   */
  static int tl_intvec_txeoc(xsc, type)
          void                    *xsc;
          u_int32_t               type;
  {
          struct tl_softc         *sc;
          struct ifnet            *ifp;
          u_int32_t               cmd;
  
          sc = xsc;
          ifp = &sc->arpcom.ac_if;
  
          /* Clear the timeout timer. */
          ifp->if_timer = 0;
  
  #ifdef TL_DEBUG
          evset(sc, EV_TXEOC);
  #endif
  
          if (sc->tl_cdata.tl_tx_head == NULL) {
                  ifp->if_flags &= ~IFF_OACTIVE;
                  sc->tl_cdata.tl_tx_tail = NULL;
                  sc->tl_txeoc = 1;
                  /*
                   * If we just drained the TX queue and
                   * there's an autoneg request waiting, set
                   * it in motion. This will block the transmitter
                   * until the autoneg session completes which will
                   * no doubt piss off any processes waiting to
                   * transmit, but that's the way the ball bounces.
                   */
                  if (sc->tl_want_auto)
                          tl_autoneg(sc, TL_FLAG_SCHEDDELAY, 1);
          } else {
                  sc->tl_txeoc = 0;
                  /* First we have to ack the EOC interrupt. */
                  CMD_PUT(sc, TL_CMD_ACK | 0x00000001 | type);
                  /* Then load the address of the next TX list. */
                  CSR_WRITE_4(sc, TL_CH_PARM,
                                  vtophys(sc->tl_cdata.tl_tx_head->tl_ptr));
                  /* Restart TX channel. */
                  cmd = CSR_READ_4(sc, TL_HOSTCMD);
                  cmd &= ~TL_CMD_RT;
                  cmd |= TL_CMD_GO|TL_CMD_INTSON;
                  CMD_PUT(sc, cmd);
                  return(0);
          }
  
          return(1);
  }
  
  static int tl_intvec_adchk(xsc, type)
          void                    *xsc;
          u_int32_t               type;
  {
          struct tl_softc         *sc;
          u_int16_t               bmcr, ctl;
  
          sc = xsc;
  
          if (type)
                  printf("tl%d: adapter check: %x\n", sc->tl_unit,
                          (unsigned int)CSR_READ_4(sc, TL_CH_PARM));
  #ifdef TL_DEBUG
          evshow(sc);
  #endif
  
          /*
           * Before resetting the adapter, try reading the PHY
           * settings so we can put them back later. This is
           * necessary to keep the chip operating at the same
           * speed and duplex settings after the reset completes.
           */
          bmcr = tl_phy_readreg(sc, PHY_BMCR);
          ctl = tl_phy_readreg(sc, TL_PHY_CTL);
          tl_softreset(sc, 1);
          tl_phy_writereg(sc, PHY_BMCR, bmcr);
          tl_phy_writereg(sc, TL_PHY_CTL, ctl);
          if (bmcr & PHY_BMCR_DUPLEX) {
                  tl_dio_setbit(sc, TL_NETCMD, TL_CMD_DUPLEX);
          } else {
                  tl_dio_clrbit(sc, TL_NETCMD, TL_CMD_DUPLEX);
          }
          tl_stop(sc);
          tl_init(sc);
          CMD_SET(sc, TL_CMD_INTSON);
  
          return(0);
  }
  
  static int tl_intvec_netsts(xsc, type)
          void                    *xsc;
          u_int32_t               type;
  {
          struct tl_softc         *sc;
          u_int16_t               netsts;
  
          sc = xsc;
  
          netsts = tl_dio_read16(sc, TL_NETSTS);
          tl_dio_write16(sc, TL_NETSTS, netsts);
  
          printf("tl%d: network status: %x\n", sc->tl_unit, netsts);
  
          return(1);
  }
  
  static void tl_intr(xsc)
          void                    *xsc;
  {
          struct tl_softc         *sc;
          struct ifnet            *ifp;
          int                     r = 0;
          u_int32_t               type = 0;
          u_int16_t               ints = 0;
          u_int8_t                ivec = 0;
  
          sc = xsc;
  
          /* Disable interrupts */
          ints = CSR_READ_2(sc, TL_HOST_INT);
          CSR_WRITE_2(sc, TL_HOST_INT, ints);
          type = (ints << 16) & 0xFFFF0000;
          ivec = (ints & TL_VEC_MASK) >> 5;
          ints = (ints & TL_INT_MASK) >> 2;
  
          ifp = &sc->arpcom.ac_if;
  
          switch(ints) {
          case (TL_INTR_INVALID):
  #ifdef DIAGNOSTIC
                  printf("tl%d: got an invalid interrupt!\n", sc->tl_unit);
  #endif
                  /* Re-enable interrupts but don't ack this one. */
                  CMD_PUT(sc, type);
                  r = 0;
                  break;
          case (TL_INTR_TXEOF):
                  r = tl_intvec_txeof((void *)sc, type);
                  break;
          case (TL_INTR_TXEOC):
                  r = tl_intvec_txeoc((void *)sc, type);
                  break;
          case (TL_INTR_STATOFLOW):
                  tl_stats_update(sc);
                  r = 1;
                  break;
          case (TL_INTR_RXEOF):
                  r = tl_intvec_rxeof((void *)sc, type);
                  break;
          case (TL_INTR_DUMMY):
                  printf("tl%d: got a dummy interrupt\n", sc->tl_unit);
                  r = 1;
                  break;
          case (TL_INTR_ADCHK):
                  if (ivec)
                          r = tl_intvec_adchk((void *)sc, type);
                  else
                          r = tl_intvec_netsts((void *)sc, type);
                  break;
          case (TL_INTR_RXEOC):
                  r = tl_intvec_rxeoc((void *)sc, type);
                  break;
          default:
                  printf("tl%d: bogus interrupt type\n", ifp->if_unit);
                  break;
          }
  
          /* Re-enable interrupts */
          if (r) {
                  CMD_PUT(sc, TL_CMD_ACK | r | type);
          }
  
          if (ifp->if_snd.ifq_head != NULL)
                  tl_start(ifp);
  
          return;
  }
  
  static void tl_stats_update(xsc)
          void                    *xsc;
  {
          struct tl_softc         *sc;
          struct ifnet            *ifp;
          struct tl_stats         tl_stats;
          u_int32_t               *p;
  
          bzero((char *)&tl_stats, sizeof(struct tl_stats));
  
          sc = xsc;
          ifp = &sc->arpcom.ac_if;
  
          p = (u_int32_t *)&tl_stats;
  
          CSR_WRITE_2(sc, TL_DIO_ADDR, TL_TXGOODFRAMES|TL_DIO_ADDR_INC);
          *p++ = CSR_READ_4(sc, TL_DIO_DATA);
          *p++ = CSR_READ_4(sc, TL_DIO_DATA);
          *p++ = CSR_READ_4(sc, TL_DIO_DATA);
          *p++ = CSR_READ_4(sc, TL_DIO_DATA);
          *p++ = CSR_READ_4(sc, TL_DIO_DATA);
  
          ifp->if_opackets += tl_tx_goodframes(tl_stats);
          ifp->if_collisions += tl_stats.tl_tx_single_collision +
                                  tl_stats.tl_tx_multi_collision;
          ifp->if_ipackets += tl_rx_goodframes(tl_stats);
          ifp->if_ierrors += tl_stats.tl_crc_errors + tl_stats.tl_code_errors +
                              tl_rx_overrun(tl_stats);
          ifp->if_oerrors += tl_tx_underrun(tl_stats);
  
          timeout(tl_stats_update, sc, hz);
  }
  
  /*
   * Encapsulate an mbuf chain in a list by coupling the mbuf data
   * pointers to the fragment pointers.
   */
  static int tl_encap(sc, c, m_head)
          struct tl_softc         *sc;
          struct tl_chain         *c;
          struct mbuf             *m_head;
  {
          int                     frag = 0;
          struct tl_frag          *f = NULL;
          int                     total_len;
          struct mbuf             *m;
  
          /*
           * Start packing the mbufs in this chain into
           * the fragment pointers. Stop when we run out
           * of fragments or hit the end of the mbuf chain.
           */
          m = m_head;
          total_len = 0;
  
          for (m = m_head, frag = 0; m != NULL; m = m->m_next) {
                  if (m->m_len != 0) {
                          if (frag == TL_MAXFRAGS)
                                  break;
                          total_len+= m->m_len;
                          c->tl_ptr->tl_frag[frag].tlist_dadr =
                                  vtophys(mtod(m, vm_offset_t));
                          c->tl_ptr->tl_frag[frag].tlist_dcnt = m->m_len;
                          frag++;
                  }
          }
  
          /*
           * Handle special cases.
           * Special case #1: we used up all 10 fragments, but
           * we have more mbufs left in the chain. Copy the
           * data into an mbuf cluster. Note that we don't
           * bother clearing the values in the other fragment
           * pointers/counters; it wouldn't gain us anything,
           * and would waste cycles.
           */
          if (m != NULL) {
                  struct mbuf             *m_new = NULL;
  
                  MGETHDR(m_new, M_DONTWAIT, MT_DATA);
                  if (m_new == NULL) {
                          printf("tl%d: no memory for tx list", sc->tl_unit);
                          return(1);
                  }
                  if (m_head->m_pkthdr.len > MHLEN) {
                          MCLGET(m_new, M_DONTWAIT);
                          if (!(m_new->m_flags & M_EXT)) {
                                  m_freem(m_new);
                                  printf("tl%d: no memory for tx list",
                                  sc->tl_unit);
                                  return(1);
                          }
                  }
                  m_copydata(m_head, 0, m_head->m_pkthdr.len,     
                                          mtod(m_new, caddr_t));
                  m_new->m_pkthdr.len = m_new->m_len = m_head->m_pkthdr.len;
                  m_freem(m_head);
                  m_head = m_new;
                  f = &c->tl_ptr->tl_frag[0];
                  f->tlist_dadr = vtophys(mtod(m_new, caddr_t));
                  f->tlist_dcnt = total_len = m_new->m_len;
                  frag = 1;
          }
  
          /*
           * Special case #2: the frame is smaller than the minimum
           * frame size. We have to pad it to make the chip happy.
           */
          if (total_len < TL_MIN_FRAMELEN) {
                  if (frag == TL_MAXFRAGS)
                          printf("tl%d: all frags filled but "
                                  "frame still to small!\n", sc->tl_unit);
                  f = &c->tl_ptr->tl_frag[frag];
                  f->tlist_dcnt = TL_MIN_FRAMELEN - total_len;
                  f->tlist_dadr = vtophys(&sc->tl_ldata->tl_pad);
                  total_len += f->tlist_dcnt;
                  frag++;
          }
  
          c->tl_mbuf = m_head;
          c->tl_ptr->tl_frag[frag - 1].tlist_dcnt |= TL_LAST_FRAG;
          c->tl_ptr->tlist_frsize = total_len;
          c->tl_ptr->tlist_cstat = TL_CSTAT_READY;
          c->tl_ptr->tlist_fptr = 0;
  
          return(0);
  }
  
  /*
   * Main transmit routine. To avoid having to do mbuf copies, we put pointers
   * to the mbuf data regions directly in the transmit lists. We also save a
   * copy of the pointers since the transmit list fragment pointers are
   * physical addresses.
   */
  static void tl_start(ifp)
          struct ifnet            *ifp;
  {
          struct tl_softc         *sc;
          struct mbuf             *m_head = NULL;
          u_int32_t               cmd;
          struct tl_chain         *prev = NULL, *cur_tx = NULL, *start_tx;
  
          sc = ifp->if_softc;
  
          if (sc->tl_autoneg) {
                  sc->tl_tx_pend = 1;
                  return;
          }
  
          /*
           * Check for an available queue slot. If there are none,
           * punt.
           */
          if (sc->tl_cdata.tl_tx_free == NULL) {
                  ifp->if_flags |= IFF_OACTIVE;
                  return;
          }
  
          start_tx = sc->tl_cdata.tl_tx_free;
  
          while(sc->tl_cdata.tl_tx_free != NULL) {
                  IF_DEQUEUE(&ifp->if_snd, m_head);
                  if (m_head == NULL)
                          break;
  
                  /* Pick a chain member off the free list. */
                  cur_tx = sc->tl_cdata.tl_tx_free;
                  sc->tl_cdata.tl_tx_free = cur_tx->tl_next;
  
                  cur_tx->tl_next = NULL;
  
                  /* Pack the data into the list. */
                  tl_encap(sc, cur_tx, m_head);
  
                  /* Chain it together */
                  if (prev != NULL) {
                          prev->tl_next = cur_tx;
                          prev->tl_ptr->tlist_fptr = vtophys(cur_tx->tl_ptr);
                  }
                  prev = cur_tx;
  
                  /*
                   * If there's a BPF listener, bounce a copy of this frame
                   * to him.
                   */
  #if NBPFILTER > 0
                  if (ifp->if_bpf)
                          bpf_mtap(ifp, cur_tx->tl_mbuf);
  #endif
          }
  
          /*
           * If there are no packets queued, bail.
           */
          if (cur_tx == NULL)
                  return;
  
          /*
           * That's all we can stands, we can't stands no more.
           * If there are no other transfers pending, then issue the
           * TX GO command to the adapter to start things moving.
           * Otherwise, just leave the data in the queue and let
           * the EOF/EOC interrupt handler send.
           */
          if (sc->tl_cdata.tl_tx_head == NULL) {
                  sc->tl_cdata.tl_tx_head = start_tx;
                  sc->tl_cdata.tl_tx_tail = cur_tx;
  #ifdef TL_DEBUG
                  evset(sc, EV_START_TX);
  #endif
  
                  if (sc->tl_txeoc) {
  #ifdef TL_DEBUG
                          evset(sc, EV_START_TX_REAL);
  #endif
                          sc->tl_txeoc = 0;
                          CSR_WRITE_4(sc, TL_CH_PARM, vtophys(start_tx->tl_ptr));
                          cmd = CSR_READ_4(sc, TL_HOSTCMD);
                          cmd &= ~TL_CMD_RT;
                          cmd |= TL_CMD_GO|TL_CMD_INTSON;
                          CMD_PUT(sc, cmd);
                  }
          } else {
  #ifdef TL_DEBUG
                  evset(sc, EV_START_Q);
  #endif
                  sc->tl_cdata.tl_tx_tail->tl_next = start_tx;
                  sc->tl_cdata.tl_tx_tail = cur_tx;
          }
  
          /*
           * Set a timeout in case the chip goes out to lunch.
           */
          ifp->if_timer = 5;
  
          return;
  }
  
  static void tl_init(xsc)
          void                    *xsc;
  {
          struct tl_softc         *sc = xsc;
          struct ifnet            *ifp = &sc->arpcom.ac_if;
          int                     s;
          u_int16_t               phy_sts;
  
          if (sc->tl_autoneg)
                  return;
  
          s = splimp();
  
          ifp = &sc->arpcom.ac_if;
  
  #ifdef TL_DEBUG
          evset(sc, EV_INIT);
  #endif
  
          /*
           * Cancel pending I/O.
           */
          tl_stop(sc);
  
          /*
           * Set 'capture all frames' bit for promiscuous mode.
           */
          if (ifp->if_flags & IFF_PROMISC)
                  tl_dio_setbit(sc, TL_NETCMD, TL_CMD_CAF);
          else
                  tl_dio_clrbit(sc, TL_NETCMD, TL_CMD_CAF);
  
          /*
           * Set capture broadcast bit to capture broadcast frames.
           */
          if (ifp->if_flags & IFF_BROADCAST)
                  tl_dio_clrbit(sc, TL_NETCMD, TL_CMD_NOBRX);
          else
                  tl_dio_setbit(sc, TL_NETCMD, TL_CMD_NOBRX);
  
          /* Init our MAC address */
          tl_setfilt(sc, (caddr_t)&sc->arpcom.ac_enaddr, 0);
  
          /* Init multicast filter, if needed. */
          tl_setmulti(sc);
  
          /* Init circular RX list. */
          if (tl_list_rx_init(sc) == ENOBUFS) {
                  printf("tl%d: initialization failed: no "
                          "memory for rx buffers\n", sc->tl_unit);
                  tl_stop(sc);
                  return;
          }
  
          /* Init TX pointers. */
          tl_list_tx_init(sc);
  
          /*
           * Enable PHY interrupts.
           */
          phy_sts = tl_phy_readreg(sc, TL_PHY_CTL);
          phy_sts |= PHY_CTL_INTEN;
          tl_phy_writereg(sc, TL_PHY_CTL, phy_sts);
  
          /* Enable MII interrupts. */
          tl_dio_setbit(sc, TL_NETSIO, TL_SIO_MINTEN);
  
          /* Enable PCI interrupts. */
          CMD_SET(sc, TL_CMD_INTSON);
  
          /* Load the address of the rx list */
          CMD_SET(sc, TL_CMD_RT);
          CSR_WRITE_4(sc, TL_CH_PARM, vtophys(&sc->tl_ldata->tl_rx_list[0]));
  
          /*
           * XXX This is a kludge to handle adapters with the Micro Linear
           * ML6692 100BaseTX PHY, which only supports 100Mbps modes and
           * relies on the controller's internal 10Mbps PHY to provide
           * 10Mbps modes. The ML6692 always shows up with a vendor/device ID
           * of 0 (it doesn't actually have vendor/device ID registers)
           * so we use that property to detect it. In theory there ought to
           * be a better way to 'spot the looney' but I can't find one.
           */
          if (!sc->tl_phy_vid) {
                  u_int8_t                        addr = 0;
                  u_int16_t                       bmcr;
  
                  bmcr = tl_phy_readreg(sc, PHY_BMCR);
                  addr = sc->tl_phy_addr;
                  sc->tl_phy_addr = TL_PHYADDR_MAX;
                  tl_phy_writereg(sc, PHY_BMCR, PHY_BMCR_RESET);
                  if (bmcr & PHY_BMCR_SPEEDSEL)
                          tl_phy_writereg(sc, PHY_BMCR, PHY_BMCR_ISOLATE);
                  else
                          tl_phy_writereg(sc, PHY_BMCR, bmcr);
                  sc->tl_phy_addr = addr;
          }
  
          /* Send the RX go command */
          CMD_SET(sc, TL_CMD_GO|TL_CMD_RT);
  
          ifp->if_flags |= IFF_RUNNING;
          ifp->if_flags &= ~IFF_OACTIVE;
  
          (void)splx(s);
  
          /* Start the stats update counter */
          timeout(tl_stats_update, sc, hz);
  
          return;
  }
  
  /*
   * Set media options.
   */
  static int tl_ifmedia_upd(ifp)
          struct ifnet            *ifp;
  {
          struct tl_softc         *sc;
          struct ifmedia          *ifm;
  
          sc = ifp->if_softc;
          ifm = &sc->ifmedia;
  
          if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
                  return(EINVAL);
  
          if (IFM_SUBTYPE(ifm->ifm_media) == IFM_AUTO)
                  tl_autoneg(sc, TL_FLAG_SCHEDDELAY, 1);
          else
                  tl_setmode(sc, ifm->ifm_media);
  
          return(0);
  }
  
  /*
   * Report current media status.
   */
  static void tl_ifmedia_sts(ifp, ifmr)
          struct ifnet            *ifp;
          struct ifmediareq       *ifmr;
  {
          u_int16_t               phy_ctl;
          u_int16_t               phy_sts;
          struct tl_softc         *sc;
  
          sc = ifp->if_softc;
  
          ifmr->ifm_active = IFM_ETHER;
  
          phy_ctl = tl_phy_readreg(sc, PHY_BMCR);
          phy_sts = tl_phy_readreg(sc, TL_PHY_CTL);
  
          if (phy_sts & PHY_CTL_AUISEL)
                  ifmr->ifm_active = IFM_ETHER|IFM_10_5;
  
          if (phy_ctl & PHY_BMCR_LOOPBK)
                  ifmr->ifm_active = IFM_ETHER|IFM_LOOP;
  
          if (phy_ctl & PHY_BMCR_SPEEDSEL)
                  ifmr->ifm_active = IFM_ETHER|IFM_100_TX;
          else
                  ifmr->ifm_active = IFM_ETHER|IFM_10_T;
  
          if (phy_ctl & PHY_BMCR_DUPLEX) {
                  ifmr->ifm_active |= IFM_FDX;
                  ifmr->ifm_active &= ~IFM_HDX;
          } else {
                  ifmr->ifm_active &= ~IFM_FDX;
                  ifmr->ifm_active |= IFM_HDX;
          }
  
          return;
  }
  
  static int tl_ioctl(ifp, command, data)
          struct ifnet            *ifp;
          int                     command;
          caddr_t                 data;
  {
          struct tl_softc         *sc = ifp->if_softc;
          struct ifreq            *ifr = (struct ifreq *) data;
          int                     s, error = 0;
  
          s = splimp();
  
          switch(command) {
          case SIOCSIFADDR:
          case SIOCGIFADDR:
          case SIOCSIFMTU:
                  error = ether_ioctl(ifp, command, data);
                  break;
          case SIOCSIFFLAGS:
                  if (ifp->if_flags & IFF_UP) {
                          tl_init(sc);
                  } else {
                          if (ifp->if_flags & IFF_RUNNING) {
                                  tl_stop(sc);
                          }
                  }
                  error = 0;
                  break;
          case SIOCADDMULTI:
          case SIOCDELMULTI:
                  if (command == SIOCADDMULTI)
                          error = ether_addmulti(ifr, &sc->arpcom);
                  else
                          error = ether_delmulti(ifr, &sc->arpcom);
                  if (error == ENETRESET) {
                          tl_setmulti(sc);
                          error = 0;
                  }
                  break;
          case SIOCSIFMEDIA:
          case SIOCGIFMEDIA:
                  error = ifmedia_ioctl(ifp, ifr, &sc->ifmedia, command);
                  break;
          default:
                  error = EINVAL;
                  break;
          }
  
          (void)splx(s);
  
          return(error);
  }
  
  static void tl_watchdog(ifp)
          struct ifnet            *ifp;
  {
          struct tl_softc         *sc;
          u_int16_t               bmsr;
  
          sc = ifp->if_softc;
  
  #ifdef TL_DEBUG
          evset(sc, EV_WATCHDOG);
  #endif
  
          if (sc->tl_autoneg) {
                  tl_autoneg(sc, TL_FLAG_DELAYTIMEO, 1);
                  return;
          }
  
          /* Check that we're still connected. */
          tl_phy_readreg(sc, PHY_BMSR);
          bmsr = tl_phy_readreg(sc, PHY_BMSR);
          if (!(bmsr & PHY_BMSR_LINKSTAT)) {
                  printf("tl%d: no carrier\n", sc->tl_unit);
                  tl_autoneg(sc, TL_FLAG_SCHEDDELAY, 1);
          } else
                  printf("tl%d: device timeout\n", sc->tl_unit);
  
          ifp->if_oerrors++;
  
          tl_init(sc);
  
          return;
  }
  
  /*
   * Stop the adapter and free any mbufs allocated to the
   * RX and TX lists.
   */
  static void tl_stop(sc)
          struct tl_softc         *sc;
  {
          register int            i;
          struct ifnet            *ifp;
  
          ifp = &sc->arpcom.ac_if;
  
          /* Stop the stats updater. */
          untimeout(tl_stats_update, sc);
  
          /* Stop the transmitter */
          CMD_CLR(sc, TL_CMD_RT);
          CMD_SET(sc, TL_CMD_STOP);
          CSR_WRITE_4(sc, TL_CH_PARM, 0);
  
          /* Stop the receiver */
          CMD_SET(sc, TL_CMD_RT);
          CMD_SET(sc, TL_CMD_STOP);
          CSR_WRITE_4(sc, TL_CH_PARM, 0);
  
          /*
           * Disable host interrupts.
           */
          CMD_SET(sc, TL_CMD_INTSOFF);
  
          /*
           * Disable MII interrupts.
           */
          tl_dio_clrbit(sc, TL_NETSIO, TL_SIO_MINTEN);
  
          /*
           * Clear list pointer.
           */
          CSR_WRITE_4(sc, TL_CH_PARM, 0);
  
          /*
           * Free the RX lists.
           */
          for (i = 0; i < TL_RX_LIST_CNT; i++) {
                  if (sc->tl_cdata.tl_rx_chain[i].tl_mbuf != NULL) {
                          m_freem(sc->tl_cdata.tl_rx_chain[i].tl_mbuf);
                          sc->tl_cdata.tl_rx_chain[i].tl_mbuf = NULL;
                  }
          }
          bzero((char *)&sc->tl_ldata->tl_rx_list,
                  sizeof(sc->tl_ldata->tl_rx_list));
  
          /*
           * Free the TX list buffers.
           */
          for (i = 0; i < TL_TX_LIST_CNT; i++) {
                  if (sc->tl_cdata.tl_tx_chain[i].tl_mbuf != NULL) {
                          m_freem(sc->tl_cdata.tl_tx_chain[i].tl_mbuf);
                          sc->tl_cdata.tl_tx_chain[i].tl_mbuf = NULL;
                  }
          }
          bzero((char *)&sc->tl_ldata->tl_tx_list,
                  sizeof(sc->tl_ldata->tl_tx_list));
  
          ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
  
          return;
  }
  
  /*
   * Stop all chip I/O so that the kernel's probe routines don't
   * get confused by errant DMAs when rebooting.
   */
  static void tl_shutdown(howto, xsc)
          int                     howto;
          void                    *xsc;
  {
          struct tl_softc         *sc;
  
          sc = xsc;
  
          tl_stop(sc);
  
          return;
  }
  
  
  static struct pci_device tl_device = {
          "tl",
          tl_probe,
          tl_attach,
          &tl_count,
          NULL
  };
  DATA_SET(pcidevice_set, tl_device);

Cache object: a9ce47ce342d81fd022c83f44dfc9285