xref: /src/sys/dev/pci/if_tl.c

/*	$NetBSD: if_tl.c,v 1.16 1998/08/13 02:10:54 eeh Exp $	*/

/*
 * Copyright (c) 1997 Manuel Bouyer.  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 Manuel Bouyer.
 * 4. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * Texas Instruments ThunderLAN ethernet controller
 * ThunderLAN Programmer's Guide (TI Literature Number SPWU013A)
 * available from www.ti.com
 */

#undef TLDEBUG
#define TL_PRIV_STATS
#undef TLDEBUG_RX
#undef TLDEBUG_TX
#undef TLDEBUG_ADDR

#include "opt_inet.h"
#include "opt_ns.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/proc.h>	/* only for declaration of wakeup() used by vm.h */
#include <sys/device.h>

#include <net/if.h>
#if defined(SIOCSIFMEDIA)
#include <net/if_media.h>
#endif
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/netisr.h>

#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#include <net/bpfdesc.h>
#endif

#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#endif

#ifdef NS
#include <netns/ns.h>
#include <netns/ns_if.h>
#endif

#include <vm/vm.h>
#include <vm/vm_param.h>
#include <vm/vm_kern.h>

#if defined(__NetBSD__)
#include <net/if_ether.h>
#if defined(INET)
#include <netinet/if_inarp.h>
#endif

#include <machine/bus.h>
#include <machine/intr.h>

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>

#include <dev/i2c/i2c_bus.h>
#include <dev/i2c/i2c_eeprom.h>

#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>

#include <dev/mii/tlphyvar.h>

#include <dev/pci/if_tlregs.h>
#include <dev/pci/if_tlvar.h>
#endif /* __NetBSD__ */

#if defined(__NetBSD__) && defined(__alpha__)
/* XXX XXX NEED REAL DMA MAPPING SUPPORT XXX XXX */
#undef vtophys
#define	vtophys(va)	alpha_XXX_dmamap((vm_offset_t)(va))
#endif

/* number of transmit/receive buffers */
#ifndef TL_NBUF
#define TL_NBUF 10
#endif

/* number of seconds the link can be idle */
#ifndef TL_IDLETIME
#define TL_IDLETIME 10
#endif

static int tl_pci_match __P((struct device *, struct cfdata *, void *));
static void tl_pci_attach __P((struct device *, struct device *, void *));
static int tl_intr __P((void *));

static int tl_ifioctl __P((struct ifnet *, ioctl_cmd_t, caddr_t));
static int tl_mediachange __P((struct ifnet *));
static void tl_mediastatus __P((struct ifnet *, struct ifmediareq *));
static void tl_ifwatchdog __P((struct ifnet *));
static void tl_shutdown __P((void*));

static void tl_ifstart __P((struct ifnet *));
static void tl_reset __P((tl_softc_t*));
static int  tl_init __P((tl_softc_t*));
static void tl_restart __P((void  *));
static int  tl_add_RxBuff __P((struct Rx_list*, struct mbuf*));
static void tl_read_stats __P((tl_softc_t*));
static void tl_ticks __P((void*));
static int tl_multicast_hash __P((u_int8_t*));
static void tl_addr_filter __P((tl_softc_t*));

static u_int32_t tl_intreg_read __P((tl_softc_t*, u_int32_t));
static void tl_intreg_write __P((tl_softc_t*, u_int32_t, u_int32_t));
static u_int8_t tl_intreg_read_byte __P((tl_softc_t*, u_int32_t));
static void tl_intreg_write_byte __P((tl_softc_t*, u_int32_t, u_int8_t));

void	tl_mii_sync __P((struct tl_softc *));
void	tl_mii_sendbits __P((struct tl_softc *, u_int32_t, int));


#if defined(TLDEBUG_RX)
static void ether_printheader __P((struct ether_header*));
#endif

int tl_mii_read __P((struct device *, int, int));
void tl_mii_write __P((struct device *, int, int, int));

void tl_statchg __P((struct device *));

void tl_i2c_set __P((void*, u_int8_t));
void tl_i2c_clr __P((void*, u_int8_t));
int tl_i2c_read __P((void*, u_int8_t));

static __inline void netsio_clr __P((tl_softc_t*, u_int8_t));
static __inline void netsio_set __P((tl_softc_t*, u_int8_t));
static __inline u_int8_t netsio_read __P((tl_softc_t*, u_int8_t));
static __inline void netsio_clr(sc, bits)
	tl_softc_t* sc;
	u_int8_t bits;
{
	tl_intreg_write_byte(sc, TL_INT_NET + TL_INT_NetSio,
		tl_intreg_read_byte(sc, TL_INT_NET + TL_INT_NetSio) & (~bits));
}
static __inline void netsio_set(sc, bits)
	tl_softc_t* sc;
	u_int8_t bits;
{
	tl_intreg_write_byte(sc, TL_INT_NET + TL_INT_NetSio,
		tl_intreg_read_byte(sc, TL_INT_NET + TL_INT_NetSio) | bits);
}
static __inline u_int8_t netsio_read(sc, bits)
	tl_softc_t* sc;
	u_int8_t bits;
{
	return (tl_intreg_read_byte(sc, TL_INT_NET + TL_INT_NetSio) & bits);
}

struct cfattach tl_ca = {
	sizeof(tl_softc_t), tl_pci_match, tl_pci_attach
};

const struct tl_product_desc tl_compaq_products[] = {
	{ PCI_PRODUCT_COMPAQ_N100TX, TLPHY_MEDIA_NO_10_T,
	  0, "Compaq Netelligent 10/100 TX" },
	{ PCI_PRODUCT_COMPAQ_N10T, TLPHY_MEDIA_10_5,
	  0, "Compaq Netelligent 10 T" },
	{ PCI_PRODUCT_COMPAQ_IntNF3P, TLPHY_MEDIA_10_2,
	  0, "Compaq Integrated NetFlex 3/P" },
	{ PCI_PRODUCT_COMPAQ_IntPL100TX, TLPHY_MEDIA_10_2|TLPHY_MEDIA_NO_10_T,
	  0, "Compaq ProLiant Integrated Netelligent 10/100 TX" },
	{ PCI_PRODUCT_COMPAQ_DPNet100TX, TLPHY_MEDIA_10_5|TLPHY_MEDIA_NO_10_T,
	  0, "Compaq Dual Port Netelligent 10/100 TX" },
	{ PCI_PRODUCT_COMPAQ_DP4000, TLPHY_MEDIA_10_5,
	  0, "Compaq Deskpro 4000 5233MMX" },
	{ PCI_PRODUCT_COMPAQ_NF3P_BNC, TLPHY_MEDIA_10_2,
	  0, "Compaq NetFlex 3/P w/ BNC" },
	{ PCI_PRODUCT_COMPAQ_NF3P, TLPHY_MEDIA_10_5,
	  0, "Compaq NetFlex 3/P" },
	{ 0, 0, NULL },
};

const struct tl_product_desc tl_ti_products[] = {
	/*
	 * Built-in Ethernet on the TI TravelMate 5000
	 * docking station; better product description?
	 * XXX Seems to have broken memory-mapped access.
	 */
	{ PCI_PRODUCT_TI_TLAN, 0,
	  TPF_BROKEN_MEM, "Texas Instruments ThunderLAN" },
	{ 0, 0, NULL },
};

struct tl_vendor_desc {
	u_int32_t tv_vendor;
	const struct tl_product_desc *tv_products;
};

const struct tl_vendor_desc tl_vendors[] = {
	{ PCI_VENDOR_COMPAQ, tl_compaq_products },
	{ PCI_VENDOR_TI, tl_ti_products },
	{ 0, NULL },
};

const struct tl_product_desc *tl_lookup_product __P((u_int32_t));

const struct tl_product_desc *
tl_lookup_product(id)
	u_int32_t id;
{
	const struct tl_product_desc *tp;
	const struct tl_vendor_desc *tv;

	for (tv = tl_vendors; tv->tv_products != NULL; tv++)
		if (PCI_VENDOR(id) == tv->tv_vendor)
			break;

	if ((tp = tv->tv_products) == NULL)
		return (NULL);

	for (; tp->tp_desc != NULL; tp++)
		if (PCI_PRODUCT(id) == tp->tp_product)
			break;

	if (tp->tp_desc == NULL)
		return (NULL);

	return (tp);
}

static char *nullbuf = NULL;

static int
tl_pci_match(parent, match, aux)
	struct device *parent;
	struct cfdata *match;
	void *aux;
{
	struct pci_attach_args *pa = (struct pci_attach_args *) aux;

	if (tl_lookup_product(pa->pa_id) != NULL)
		return (1);

	return (0);
}

static void
tl_pci_attach(parent, self, aux)
	struct device * parent;
	struct device * self;
	void * aux;
{
	tl_softc_t *sc = (tl_softc_t *)self;
	struct pci_attach_args * const pa = (struct pci_attach_args *) aux;
	const struct tl_product_desc *tp;
	struct ifnet * const ifp = &sc->tl_if;
	bus_space_tag_t iot, memt;
	bus_space_handle_t ioh, memh;
	pci_intr_handle_t intrhandle;
	const char *intrstr;
	int i, tmp, ioh_valid, memh_valid;
	pcireg_t csr;

	printf("\n");

	tp = tl_lookup_product(pa->pa_id);
	if (tp == NULL)
		panic("tl_pci_attach: impossible");
	sc->tl_product = tp;

	/* Map the card space. */
	ioh_valid = (pci_mapreg_map(pa, PCI_CBIO, PCI_MAPREG_TYPE_IO, 0,
	    &iot, &ioh, NULL, NULL) == 0);
	memh_valid = (pci_mapreg_map(pa, PCI_CBMA,
	    PCI_MAPREG_TYPE_MEM | PCI_MAPREG_MEM_TYPE_32BIT,
	    0, &memt, &memh, NULL, NULL) == 0);

	if (memh_valid && (tp->tp_flags & TPF_BROKEN_MEM) == 0) {
		sc->tl_bustag = memt;
		sc->tl_bushandle = memh;
	} else if (ioh_valid) {
		sc->tl_bustag = iot;
		sc->tl_bushandle = ioh;
	} else {
		printf("%s: unable to map device registers\n",
		    sc->sc_dev.dv_xname);
		return;
	}

	/* Enable the device. */
	csr = pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
	pci_conf_write(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG,
	    csr | PCI_COMMAND_MASTER_ENABLE);

	printf("%s: %s\n", sc->sc_dev.dv_xname, tp->tp_desc);

	tl_reset(sc);

	/* fill in the i2c struct */
	sc->i2cbus.adapter_softc = sc;
	sc->i2cbus.set_bit = tl_i2c_set;
	sc->i2cbus.clr_bit = tl_i2c_clr;
	sc->i2cbus.read_bit = tl_i2c_read;

#ifdef TLDEBUG
	printf("default values of INTreg: 0x%x\n",
		tl_intreg_read(sc, TL_INT_Defaults));
#endif

	/* read mac addr */
	for (i=0; i<ETHER_ADDR_LEN; i++) {
		tmp = i2c_eeprom_read(&sc->i2cbus, 0x83 + i);
		if (tmp < 0) {
			printf("%s: error reading Ethernet adress\n",
			    sc->sc_dev.dv_xname);
			return;
		} else {
			sc->tl_enaddr[i] = tmp;
		}
	}
	printf("%s: Ethernet address %s\n", sc->sc_dev.dv_xname,
		ether_sprintf(sc->tl_enaddr));

	/* Map and establish interrupts */
	if (pci_intr_map(pa->pa_pc, pa->pa_intrtag, pa->pa_intrpin,
		pa->pa_intrline, &intrhandle)) {
		printf("%s: couldn't map interrupt\n", sc->sc_dev.dv_xname);
		return;
	}
	intrstr = pci_intr_string(pa->pa_pc, intrhandle);
	sc->tl_ih = pci_intr_establish(pa->pa_pc, intrhandle, IPL_NET,
		tl_intr, sc);
	if (sc->tl_ih == NULL) {
		printf("%s: couldn't establish interrupt",
		    sc->sc_dev.dv_xname);
		if (intrstr != NULL)
			printf(" at %s", intrstr);
		printf("\n");
		return;
	}
	printf("%s: interrupting at %s\n", sc->sc_dev.dv_xname, intrstr);

	/*
	 * Add shutdown hook so that DMA is disabled prior to reboot. Not
	 * doing do could allow DMA to corrupt kernel memory during the
	 * reboot before the driver initializes.
	 */
	(void) shutdownhook_establish(tl_shutdown, sc);

	/*
	 * Initialize our media structures and probe the MII.
	 *
	 * Note that we don't care about the media instance.  We
	 * are expecting to have multiple PHYs on the 10/100 cards,
	 * and on those cards we exclude the internal PHY from providing
	 * 10baseT.  By ignoring the instance, it allows us to not have
	 * to specify it on the command line when switching media.
	 */
	sc->tl_mii.mii_ifp = ifp;
	sc->tl_mii.mii_readreg = tl_mii_read;
	sc->tl_mii.mii_writereg = tl_mii_write;
	sc->tl_mii.mii_statchg = tl_statchg;
	ifmedia_init(&sc->tl_mii.mii_media, IFM_IMASK, tl_mediachange,
	    tl_mediastatus);
	mii_phy_probe(self, &sc->tl_mii, 0xffffffff);
#ifdef notyet	/* XXX XXX XXX */
	if (LIST_FIRST(&sc->tl_mii.mii_phys) == NULL) {
		ifmedia_add(&sc->tl_mii.mii_media, IFM_ETHER|IFM_NONE, 0, NULL);
		ifmedia_set(&sc->tl_mii.mii_media, IFM_ETHER|IFM_NONE);
	} else
		ifmedia_set(&sc->tl_mii.mii_media, IFM_ETHER|IFM_AUTO);
#else
	ifmedia_set(&sc->tl_mii.mii_media, IFM_ETHER|IFM_NONE);
#endif

	bcopy(sc->sc_dev.dv_xname, sc->tl_if.if_xname, IFNAMSIZ);
	sc->tl_if.if_softc = sc;
	ifp->if_flags = IFF_BROADCAST|IFF_SIMPLEX|IFF_NOTRAILERS|IFF_MULTICAST;
	ifp->if_ioctl = tl_ifioctl;
	ifp->if_start = tl_ifstart;
	ifp->if_watchdog = tl_ifwatchdog;
	ifp->if_timer = 0;
	if_attach(ifp);
	ether_ifattach(&(sc)->tl_if, (sc)->tl_enaddr);
#if NBPFILTER > 0
	bpfattach(&sc->tl_bpf, &sc->tl_if, DLT_EN10MB,
		sizeof(struct ether_header));
#endif
}

static void
tl_reset(sc)
	tl_softc_t *sc;
{
	int i;

	/* read stats */
	if (sc->tl_if.if_flags & IFF_RUNNING) {
		untimeout(tl_ticks, sc);
		tl_read_stats(sc);
	}
	/* Reset adapter */
	TL_HR_WRITE(sc, TL_HOST_CMD,
		TL_HR_READ(sc, TL_HOST_CMD) | HOST_CMD_Ad_Rst);
	DELAY(100000);
	/* Disable interrupts */
	TL_HR_WRITE(sc, TL_HOST_CMD, HOST_CMD_IntOff);
	/* setup aregs & hash */
	for (i = TL_INT_Areg0; i <= TL_INT_HASH2; i = i + 4)
		tl_intreg_write(sc, i, 0);
#ifdef TLDEBUG_ADDR
	printf("Areg & hash registers: \n");
	for (i = TL_INT_Areg0; i <= TL_INT_HASH2; i = i + 4)
		printf("    reg %x: %x\n", i, tl_intreg_read(sc, i));
#endif
	/* Setup NetConfig */
	tl_intreg_write(sc, TL_INT_NetConfig,
		TL_NETCONFIG_1F | TL_NETCONFIG_1chn | TL_NETCONFIG_PHY_EN);
	/* Bsize: accept default */
	/* TX commit in Acommit: accept default */
	/* Load Ld_tmr and Ld_thr */
	/* Ld_tmr = 3 */
	TL_HR_WRITE(sc, TL_HOST_CMD, 0x3 | HOST_CMD_LdTmr);
	/* Ld_thr = 0 */
	TL_HR_WRITE(sc, TL_HOST_CMD, 0x0 | HOST_CMD_LdThr);
	/* Unreset MII */
	netsio_set(sc, TL_NETSIO_NMRST);
	DELAY(100000);
	sc->tl_mii.mii_media_status &= ~IFM_ACTIVE;
	sc->tl_flags = 0;
	sc->opkt = 0;
	sc->stats_exesscoll = 0;
}

static void tl_shutdown(v)
	void *v;
{
	tl_softc_t *sc = v;
	struct Tx_list *Tx;
	int i;

	if ((sc->tl_if.if_flags & IFF_RUNNING) == 0)
		return;
	/* disable interrupts */
	TL_HR_WRITE(sc, TL_HOST_CMD,
		HOST_CMD_IntOff);
	/* stop TX and RX channels */
	TL_HR_WRITE(sc, TL_HOST_CMD,
		HOST_CMD_STOP | HOST_CMD_RT | HOST_CMD_Nes);
	TL_HR_WRITE(sc, TL_HOST_CMD, HOST_CMD_STOP);
	DELAY(100000);

	/* stop statistics reading loop, read stats */
	untimeout(tl_ticks, sc);
	tl_read_stats(sc);

	/* deallocate memory allocations */
	for (i=0; i< TL_NBUF; i++) {
		if (sc->Rx_list[i].m)
			m_freem(sc->Rx_list[i].m);
			sc->Rx_list[i].m = NULL;
	}
	free(sc->Rx_list, M_DEVBUF);
	sc->Rx_list = NULL;
	while ((Tx = sc->active_Tx) != NULL) {
		Tx->hw_list.stat = 0;
		m_freem(Tx->m);
		sc->active_Tx = Tx->next;
		Tx->next = sc->Free_Tx;
		sc->Free_Tx = Tx;
	}
	sc->last_Tx = NULL;
	free(sc->Tx_list, M_DEVBUF);
	sc->Tx_list = NULL;
	sc->tl_if.if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
	sc->tl_mii.mii_media_status &= ~IFM_ACTIVE;
	sc->tl_flags = 0;
}

static void tl_restart(v)
	void *v;
{
	tl_init(v);
}

static int tl_init(sc)
	tl_softc_t *sc;
{
	struct ifnet *ifp = &sc->tl_if;
	int i, s;

	s = splnet();
	/* cancel any pending IO */
	tl_shutdown(sc);
	tl_reset(sc);
	if ((sc->tl_if.if_flags & IFF_UP) == 0) {
		splx(s);
		return 0;
	}
	/* Set various register to reasonable value */
	/* setup NetCmd in promisc mode if needed */
	i = (ifp->if_flags & IFF_PROMISC) ? TL_NETCOMMAND_CAF : 0;
	tl_intreg_write_byte(sc, TL_INT_NET + TL_INT_NetCmd,
		TL_NETCOMMAND_NRESET | TL_NETCOMMAND_NWRAP | i);
	/* Max receive size : MCLBYTES */
	tl_intreg_write_byte(sc, TL_INT_MISC + TL_MISC_MaxRxL, MCLBYTES & 0xff);
	tl_intreg_write_byte(sc, TL_INT_MISC + TL_MISC_MaxRxH,
		(MCLBYTES >> 8) & 0xff);

	/* init MAC addr */
	for (i = 0; i < ETHER_ADDR_LEN; i++)
		tl_intreg_write_byte(sc, TL_INT_Areg0 + i , sc->tl_enaddr[i]);
	/* add multicast filters */
	tl_addr_filter(sc);
#ifdef TLDEBUG_ADDR
	printf("Wrote Mac addr, Areg & hash registers are now: \n");
	for (i = TL_INT_Areg0; i <= TL_INT_HASH2; i = i + 4)
		printf("    reg %x: %x\n", i, tl_intreg_read(sc, i));
#endif

	/* Pre-allocate receivers mbuf, make the lists */
	sc->Rx_list = malloc(sizeof(struct Rx_list) * TL_NBUF, M_DEVBUF, M_NOWAIT);
	sc->Tx_list = malloc(sizeof(struct Tx_list) * TL_NBUF, M_DEVBUF, M_NOWAIT);
	if (sc->Rx_list == NULL || sc->Tx_list == NULL) {
		printf("%s: out of memory for lists\n", sc->sc_dev.dv_xname);
		sc->tl_if.if_flags &= ~IFF_UP;
		splx(s);
		return ENOMEM;
	}
	for (i=0; i< TL_NBUF; i++) {
		if(tl_add_RxBuff(&sc->Rx_list[i], NULL) == 0) {
			printf("%s: out of mbuf for receive list\n", sc->sc_dev.dv_xname);
			sc->tl_if.if_flags &= ~IFF_UP;
			splx(s);
			return ENOMEM;
		}
		if (i > 0) { /* chain the list */
			sc->Rx_list[i-1].next = &sc->Rx_list[i];
			sc->Rx_list[i-1].hw_list.fwd = vtophys(&sc->Rx_list[i].hw_list);
#ifdef DIAGNOSTIC
			if (sc->Rx_list[i-1].hw_list.fwd & 0x7)
				printf("%s: physical addr 0x%x of list not properly aligned\n",
					sc->sc_dev.dv_xname, sc->Rx_list[i-1].hw_list.fwd);
#endif
			sc->Tx_list[i-1].next = &sc->Tx_list[i];
		}
	}
	sc->Rx_list[TL_NBUF-1].next = NULL;
	sc->Rx_list[TL_NBUF-1].hw_list.fwd = 0;
	sc->Tx_list[TL_NBUF-1].next = NULL;

	sc->active_Rx = &sc->Rx_list[0];
	sc->last_Rx   = &sc->Rx_list[TL_NBUF-1];
	sc->active_Tx = sc->last_Tx = NULL;
	sc->Free_Tx   = &sc->Tx_list[0];

	if (nullbuf == NULL)
		nullbuf = malloc(ETHER_MIN_TX, M_DEVBUF, M_NOWAIT);
	if (nullbuf == NULL) {
		printf("%s: can't allocate space for pad buffer\n",
			sc->sc_dev.dv_xname);
		sc->tl_if.if_flags &= ~IFF_UP;
		splx(s);
		return ENOMEM;
	}
	bzero(nullbuf, ETHER_MIN_TX);

	/* set media */
	mii_mediachg(&sc->tl_mii);

	/* start ticks calls */
	timeout(tl_ticks, sc, hz);
	/* write adress of Rx list and enable interrupts */
	TL_HR_WRITE(sc, TL_HOST_CH_PARM, vtophys(&sc->Rx_list[0].hw_list));
	TL_HR_WRITE(sc, TL_HOST_CMD,
		HOST_CMD_GO | HOST_CMD_RT | HOST_CMD_Nes | HOST_CMD_IntOn);
	sc->tl_if.if_flags |= IFF_RUNNING;
	sc->tl_if.if_flags &= ~IFF_OACTIVE;
	return 0;
}


static u_int32_t
tl_intreg_read(sc, reg)
	tl_softc_t *sc;
	u_int32_t reg;
{
	TL_HR_WRITE(sc, TL_HOST_INTR_DIOADR, reg & TL_HOST_DIOADR_MASK);
	return TL_HR_READ(sc, TL_HOST_DIO_DATA);
}

static u_int8_t
tl_intreg_read_byte(sc, reg)
	tl_softc_t *sc;
	u_int32_t reg;
{
	TL_HR_WRITE(sc, TL_HOST_INTR_DIOADR,
		(reg & (~0x07)) & TL_HOST_DIOADR_MASK);
	return TL_HR_READ_BYTE(sc, TL_HOST_DIO_DATA + (reg & 0x07));
}

static void
tl_intreg_write(sc, reg, val)
	tl_softc_t *sc;
	u_int32_t reg;
	u_int32_t val;
{
	TL_HR_WRITE(sc, TL_HOST_INTR_DIOADR, reg & TL_HOST_DIOADR_MASK);
	TL_HR_WRITE(sc, TL_HOST_DIO_DATA, val);
}

static void
tl_intreg_write_byte(sc, reg, val)
	tl_softc_t *sc;
	u_int32_t reg;
	u_int8_t val;
{
	TL_HR_WRITE(sc, TL_HOST_INTR_DIOADR,
		(reg & (~0x03)) & TL_HOST_DIOADR_MASK);
	TL_HR_WRITE_BYTE(sc, TL_HOST_DIO_DATA + (reg & 0x03), val);
}

void
tl_mii_sync(sc)
	struct tl_softc *sc;
{
	int i;

	netsio_clr(sc, TL_NETSIO_MTXEN);
	for (i = 0; i < 32; i++) {
		netsio_clr(sc, TL_NETSIO_MCLK);
		netsio_set(sc, TL_NETSIO_MCLK);
	}
}

void
tl_mii_sendbits(sc, data, nbits)
	struct tl_softc *sc;
	u_int32_t data;
	int nbits;
{
	int i;

	netsio_set(sc, TL_NETSIO_MTXEN);
	for (i = 1 << (nbits - 1); i; i = i >>  1) {
		netsio_clr(sc, TL_NETSIO_MCLK);
		netsio_read(sc, TL_NETSIO_MCLK);
		if (data & i)
			netsio_set(sc, TL_NETSIO_MDATA);
		else
			netsio_clr(sc, TL_NETSIO_MDATA);
		netsio_set(sc, TL_NETSIO_MCLK);
		netsio_read(sc, TL_NETSIO_MCLK);
	}
}

int
tl_mii_read(self, phy, reg)
	struct device *self;
	int phy, reg;
{
	struct tl_softc *sc = (struct tl_softc *)self;
	int val = 0, i, err;

	/*
	 * Read the PHY register by manually driving the MII control lines.
	 */

	tl_mii_sync(sc);
	tl_mii_sendbits(sc, MII_COMMAND_START, 2);
	tl_mii_sendbits(sc, MII_COMMAND_READ, 2);
	tl_mii_sendbits(sc, phy, 5);
	tl_mii_sendbits(sc, reg, 5);

	netsio_clr(sc, TL_NETSIO_MTXEN);
	netsio_clr(sc, TL_NETSIO_MCLK);
	netsio_set(sc, TL_NETSIO_MCLK);
	netsio_clr(sc, TL_NETSIO_MCLK);

	err = netsio_read(sc, TL_NETSIO_MDATA);
	netsio_set(sc, TL_NETSIO_MCLK);

	/* Even if an error occurs, must still clock out the cycle. */
	for (i = 0; i < 16; i++) {
		val <<= 1;
		netsio_clr(sc, TL_NETSIO_MCLK);
		if (err == 0 && netsio_read(sc, TL_NETSIO_MDATA))
			val |= 1;
		netsio_set(sc, TL_NETSIO_MCLK);
	}
	netsio_clr(sc, TL_NETSIO_MCLK);
	netsio_set(sc, TL_NETSIO_MCLK);

	return (err ? 0 : val);
}

void
tl_mii_write(self, phy, reg, val)
	struct device *self;
	int phy, reg, val;
{
	struct tl_softc *sc = (struct tl_softc *)self;

	/*
	 * Write the PHY register by manually driving the MII control lines.
	 */

	tl_mii_sync(sc);
	tl_mii_sendbits(sc, MII_COMMAND_START, 2);
	tl_mii_sendbits(sc, MII_COMMAND_WRITE, 2);
	tl_mii_sendbits(sc, phy, 5);
	tl_mii_sendbits(sc, reg, 5);
	tl_mii_sendbits(sc, MII_COMMAND_ACK, 2);
	tl_mii_sendbits(sc, val, 16);

	netsio_clr(sc, TL_NETSIO_MCLK);
	netsio_set(sc, TL_NETSIO_MCLK);
}

void
tl_statchg(self)
	struct device *self;
{
	tl_softc_t *sc = (struct tl_softc *)self;
	u_int32_t reg;

#ifdef TLDEBUG
	printf("tl_statchg, media %x\n", sc->tl_ifmedia.ifm_media);
#endif

	/*
	 * We must keep the ThunderLAN and the PHY in sync as
	 * to the status of full-duplex!
	 */
	reg = tl_intreg_read_byte(sc, TL_INT_NET + TL_INT_NetCmd);
	if (sc->tl_mii.mii_media_active & IFM_FDX)
		reg |= TL_NETCOMMAND_DUPLEX;
	else
		reg &= ~TL_NETCOMMAND_DUPLEX;
	tl_intreg_write_byte(sc, TL_INT_NET + TL_INT_NetCmd, reg);

	/* XXX Update ifp->if_baudrate */
}

void tl_i2c_set(v, bit)
	void *v;
	u_int8_t bit;
{
	tl_softc_t *sc = v;

	switch (bit) {
	case I2C_DATA:
		netsio_set(sc, TL_NETSIO_EDATA);
		break;
	case I2C_CLOCK:
		netsio_set(sc, TL_NETSIO_ECLOCK);
		break;
	case I2C_TXEN:
		netsio_set(sc, TL_NETSIO_ETXEN);
		break;
	default:
		printf("tl_i2c_set: unknown bit %d\n", bit);
	}
	return;
}

void tl_i2c_clr(v, bit)
	void *v;
	u_int8_t bit;
{
	tl_softc_t *sc = v;

	switch (bit) {
	case I2C_DATA:
		netsio_clr(sc, TL_NETSIO_EDATA);
		break;
	case I2C_CLOCK:
		netsio_clr(sc, TL_NETSIO_ECLOCK);
		break;
	case I2C_TXEN:
		netsio_clr(sc, TL_NETSIO_ETXEN);
		break;
	default:
		printf("tl_i2c_clr: unknown bit %d\n", bit);
	}
	return;
}

int tl_i2c_read(v, bit)
	void *v;
	u_int8_t bit;
{
	tl_softc_t *sc = v;

	switch (bit) {
	case I2C_DATA:
		return netsio_read(sc, TL_NETSIO_EDATA);
		break;
	case I2C_CLOCK:
		return netsio_read(sc, TL_NETSIO_ECLOCK);
		break;
	case I2C_TXEN:
		return netsio_read(sc, TL_NETSIO_ETXEN);
		break;
	default:
		printf("tl_i2c_read: unknown bit %d\n", bit);
		return -1;
	}
}

static int
tl_intr(v)
	void *v;
{
	tl_softc_t *sc = v;
	struct ifnet *ifp = &sc->tl_if;
	struct Rx_list *Rx;
	struct Tx_list *Tx;
	struct mbuf *m;
	u_int32_t int_type, int_reg;
	int ack = 0;
	int size;

	int_reg = TL_HR_READ(sc, TL_HOST_INTR_DIOADR);
	int_type = int_reg  & TL_INTR_MASK;
	if (int_type == 0)
		return 0;
#if defined(TLDEBUG_RX) || defined(TLDEBUG_TX)
	printf("%s: interrupt type %x, intr_reg %x\n", sc->sc_dev.dv_xname,
		int_type, int_reg);
#endif
	/* disable interrupts */
	TL_HR_WRITE(sc, TL_HOST_CMD, HOST_CMD_IntOff);
	switch(int_type & TL_INTR_MASK) {
	case TL_INTR_RxEOF:
		while(sc->active_Rx->hw_list.stat & TL_RX_CSTAT_CPLT) {
			/* dequeue and requeue at end of list */
			ack++;
			Rx = sc->active_Rx;
			sc->active_Rx = Rx->next;
			m = Rx->m;
			size = Rx->hw_list.stat >> 16;
#ifdef TLDEBUG_RX
			printf("tl_intr: RX list complete, Rx %p, size=%d\n", Rx, size);
#endif
			if (tl_add_RxBuff(Rx, m ) == 0) {
				/* No new mbuf, reuse the same. This means that this packet
					is lost */
				m = NULL;
#ifdef TL_PRIV_STATS
				sc->ierr_nomem++;
#endif
#ifdef TLDEBUG
				printf("%s: out of mbuf, lost input packet\n",
					sc->sc_dev.dv_xname);
#endif
			}
			Rx->next = NULL;
			Rx->hw_list.fwd = 0;
			sc->last_Rx->hw_list.fwd = vtophys(&Rx->hw_list);
#ifdef DIAGNOSTIC
			if (sc->last_Rx->hw_list.fwd & 0x7)
				printf("%s: physical addr 0x%x of list not properly aligned\n",
					sc->sc_dev.dv_xname, sc->last_Rx->hw_list.fwd);
#endif
			sc->last_Rx->next = Rx;
			sc->last_Rx = Rx;

			/* deliver packet */
			if (m) {
				struct ether_header *eh;
				if (size < sizeof(struct ether_header)) {
					m_freem(m);
					continue;
				}
				m->m_pkthdr.rcvif = ifp;
				m->m_pkthdr.len = m->m_len =
					size - sizeof(struct ether_header);
				eh = mtod(m, struct ether_header *);
#ifdef TLDEBUG_RX
				printf("tl_intr: Rx packet:\n");
				ether_printheader(eh);
#endif
#if NBPFILTER > 0
				if (ifp->if_bpf) {
					bpf_tap(ifp->if_bpf,
						mtod(m, caddr_t),
						size);
					/*
				 	* Only pass this packet up
				 	* if it is for us.
				 	*/
					if ((ifp->if_flags & IFF_PROMISC) &&
						(eh->ether_dhost[0] & 1) == 0 && /* !mcast and !bcast */
						bcmp(eh->ether_dhost, LLADDR(ifp->if_sadl),
							sizeof(eh->ether_dhost)) != 0) {
						m_freem(m);
						continue;
					}
				}
#endif /* NBPFILTER > 0 */
				m->m_data += sizeof(struct ether_header);
				ether_input(ifp, eh, m);
			}
		}
#ifdef TLDEBUG_RX
		printf("TL_INTR_RxEOF: ack %d\n", ack);
#else
		if (ack == 0) {
			printf("%s: EOF intr without anything to read !\n",
				sc->sc_dev.dv_xname);
			tl_reset(sc);
			/* shedule reinit of the board */
			timeout(tl_restart, sc, 1);
			return(1);
		}
#endif
		break;
	case TL_INTR_RxEOC:
		ack++;
#ifdef TLDEBUG_RX
		printf("TL_INTR_RxEOC: ack %d\n", ack);
#endif
#ifdef DIAGNOSTIC
		if (sc->active_Rx->hw_list.stat & TL_RX_CSTAT_CPLT) {
			printf("%s: Rx EOC interrupt and active Rx list not cleared\n",
				sc->sc_dev.dv_xname);
			return 0;
		} else
#endif
		{
		/* write adress of Rx list and send Rx GO command, ack interrupt
		 and enable interrupts in one command */
		TL_HR_WRITE(sc, TL_HOST_CH_PARM,
			vtophys(&sc->active_Rx->hw_list));
		TL_HR_WRITE(sc, TL_HOST_CMD,
			HOST_CMD_GO | HOST_CMD_RT | HOST_CMD_Nes | ack | int_type |
			HOST_CMD_ACK | HOST_CMD_IntOn);
		return 1;
		}
	case TL_INTR_TxEOF:
	case TL_INTR_TxEOC:
		while ((Tx = sc->active_Tx) != NULL) {
			if((Tx->hw_list.stat & TL_TX_CSTAT_CPLT) == 0)
				break;
			ack++;
#ifdef TLDEBUG_TX
			printf("TL_INTR_TxEOC: list 0x%xp done\n", vtophys(&Tx->hw_list));
#endif
			Tx->hw_list.stat = 0;
			m_freem(Tx->m);
			Tx->m = NULL;
			sc->active_Tx = Tx->next;
			if (sc->active_Tx == NULL)
				sc->last_Tx = NULL;
			Tx->next = sc->Free_Tx;
			sc->Free_Tx = Tx;
		}
		/* if this was an EOC, ACK immediatly */
		if (int_type == TL_INTR_TxEOC) {
#ifdef TLDEBUG_TX
			printf("TL_INTR_TxEOC: ack %d (will be set to 1)\n", ack);
#endif
			TL_HR_WRITE(sc, TL_HOST_CMD, 1 | int_type | HOST_CMD_ACK |
				HOST_CMD_IntOn);
			if ( sc->active_Tx != NULL) { /* needs a Tx go command */
				TL_HR_WRITE(sc, TL_HOST_CH_PARM,
					vtophys(&sc->active_Tx->hw_list));
				TL_HR_WRITE(sc, TL_HOST_CMD, HOST_CMD_GO);
			}
			sc->tl_if.if_timer = 0;
			if (sc->tl_if.if_snd.ifq_head != NULL)
				tl_ifstart(&sc->tl_if);
			return 1;
		}
#ifdef TLDEBUG
		else {
			printf("TL_INTR_TxEOF: ack %d\n", ack);
		}
#endif
		sc->tl_if.if_timer = 0;
		if (sc->tl_if.if_snd.ifq_head != NULL)
			tl_ifstart(&sc->tl_if);
		break;
	case TL_INTR_Stat:
		ack++;
#ifdef TLDEBUG
		printf("TL_INTR_Stat: ack %d\n", ack);
#endif
		tl_read_stats(sc);
		break;
	case TL_INTR_Adc:
		if (int_reg & TL_INTVec_MASK) {
			/* adapter check conditions */
			printf("%s: check condition, intvect=0x%x, ch_param=0x%x\n",
				sc->sc_dev.dv_xname, int_reg & TL_INTVec_MASK,
				TL_HR_READ(sc, TL_HOST_CH_PARM));
			tl_reset(sc);
			/* shedule reinit of the board */
			timeout(tl_restart, sc, 1);
			return(1);
		} else {
			u_int8_t netstat;
			/* Network status */
			netstat = tl_intreg_read_byte(sc, TL_INT_NET+TL_INT_NetSts);
			printf("%s: network status, NetSts=%x\n",
				sc->sc_dev.dv_xname, netstat);
			/* Ack interrupts */
			tl_intreg_write_byte(sc, TL_INT_NET+TL_INT_NetSts, netstat);
			ack++;
		}
		break;
	default:
		printf("%s: unhandled interrupt code %x!\n",
			sc->sc_dev.dv_xname, int_type);
		ack++;
	}

	if (ack) {
		/* Ack the interrupt and enable interrupts */
		TL_HR_WRITE(sc, TL_HOST_CMD, ack | int_type | HOST_CMD_ACK |
			HOST_CMD_IntOn);
		return 1;
	}
	/* ack = 0 ; interrupt was perhaps not our. Just enable interrupts */
	TL_HR_WRITE(sc, TL_HOST_CMD, HOST_CMD_IntOn);
	return 0;
}

static int
tl_ifioctl(ifp, cmd, data)
    struct ifnet *ifp;
	ioctl_cmd_t cmd;
	caddr_t data;
{
	struct tl_softc *sc = ifp->if_softc;
	struct ifreq *ifr = (struct ifreq *)data;
	int s, error;

	s = splnet();
	switch(cmd) {
	case SIOCSIFADDR: {
		struct ifaddr *ifa = (struct ifaddr *)data;
		sc->tl_if.if_flags |= IFF_UP;
		if ((error = tl_init(sc)) != NULL) {
			sc->tl_if.if_flags &= ~IFF_UP;
			break;
		}
		switch (ifa->ifa_addr->sa_family) {
#ifdef INET
		case AF_INET:
			arp_ifinit(ifp, ifa);
			break;
#endif
#ifdef NS
		case AF_NS: {
			struct ns_addr *ina = &IA_SNS(ifa)->sns_addr;

			if (ns_nullhost(*ina))
				ina->x_host  = *(union ns_host*) LLADDR(ifp->if_sadl);
			else
				bcopy(ina->x_host.c_host, LLADDR(ifp->if_sadl),
					ifp->if_addrlen);
			break;
		}
#endif
		default:
			break;
		}
	break;
	}
	case SIOCSIFFLAGS:
	{
		u_int8_t reg;
		/*
		 * If interface is marked up and not running, then start it.
		 * If it is marked down and running, stop it.
		 */
		if (ifp->if_flags & IFF_UP) {
			if ((ifp->if_flags & IFF_RUNNING) == 0) {
				error = tl_init(sc);
				/* all flags have been handled by init */
				break;
			}
			error = 0;
			reg = tl_intreg_read_byte(sc, TL_INT_NET + TL_INT_NetCmd);
			if (ifp->if_flags & IFF_PROMISC)
				reg |= TL_NETCOMMAND_CAF;
			else
				reg &= ~TL_NETCOMMAND_CAF;
			tl_intreg_write_byte(sc, TL_INT_NET + TL_INT_NetCmd, reg);
#ifdef TL_PRIV_STATS
			if (ifp->if_flags & IFF_LINK0) {
				ifp->if_flags &= ~IFF_LINK0;
				printf("%s errors statistics\n", sc->sc_dev.dv_xname);
				printf("    %4d RX buffer overrun\n",sc->ierr_overr);
				printf("    %4d RX code error\n", sc->ierr_code);
				printf("    %4d RX crc error\n", sc->ierr_crc);
				printf("    %4d RX out of memory\n", sc->ierr_nomem);
				printf("    %4d TX buffer underrun\n", sc->oerr_underr);
				printf("    %4d TX deffered frames\n", sc->oerr_deffered);
				printf("    %4d TX single collisions\n", sc->oerr_coll);
				printf("    %4d TX multi collisions\n", sc->oerr_multicoll);
				printf("    %4d TX exessive collisions\n", sc->oerr_exesscoll);
				printf("    %4d TX late collisions\n", sc->oerr_latecoll);
				printf("    %4d TX carrier loss\n", sc->oerr_carrloss);
				printf("    %4d TX mbuf copy\n", sc->oerr_mcopy);
			}
#endif
		} else {
			if (ifp->if_flags & IFF_RUNNING)
				tl_shutdown(sc);
			error = 0;
		}
		break;
	}
	case SIOCADDMULTI:
	case SIOCDELMULTI:
		/*
		 * Update multicast listeners
		 */
		if (cmd == SIOCADDMULTI)
			error = ether_addmulti(ifr, &sc->tl_ec);
		else
			error = ether_delmulti(ifr, &sc->tl_ec);
		if (error == ENETRESET) {
			tl_addr_filter(sc);
			error = 0;
		}
		break;
	case SIOCSIFMEDIA:
	case SIOCGIFMEDIA:
		error = ifmedia_ioctl(ifp, ifr, &sc->tl_mii.mii_media, cmd);
		break;
	default:
		error = EINVAL;
	}
	splx(s);
	return error;
}

static void
tl_ifstart(ifp)
	struct ifnet *ifp;
{
	tl_softc_t *sc = ifp->if_softc;
	struct mbuf *m, *mb_head;
	struct Tx_list *Tx;
	int segment, size;

txloop:
	/* If we don't have more space ... */
	if (sc->Free_Tx == NULL) {
#ifdef TLDEBUG
		printf("tl_ifstart: No free TX list\n");
#endif
		return;
	}
	/* Grab a paquet for output */
	IF_DEQUEUE(&ifp->if_snd, mb_head);
	if (mb_head == NULL) {
#ifdef TLDEBUG_TX
		printf("tl_ifstart: nothing to send\n");
#endif
		return;
	}
	Tx = sc->Free_Tx;
	sc->Free_Tx = Tx->next;
	/*
	 * Go through each of the mbufs in the chain and initialize
	 * the transmit list descriptors with the physical address
	 * and size of the mbuf.
	 */
tbdinit:
	bzero(Tx, sizeof(struct Tx_list));
	Tx->m = mb_head;
	size = 0;
	for (m = mb_head, segment = 0; m != NULL ; m = m->m_next) {
		if (m->m_len != 0) {
			if (segment == TL_NSEG)
				break;
			size += m->m_len;
			Tx->hw_list.seg[segment].data_addr =
				vtophys(mtod(m, vaddr_t));
			Tx->hw_list.seg[segment].data_count = m->m_len;
			segment++;
		}
	}
	if (m != NULL || (size < ETHER_MIN_TX && segment == TL_NSEG)) {
		/*
		 * We ran out of segments, or we will. We have to recopy this mbuf
		 * chain first.
		 */
		struct mbuf *mn;
#ifdef TLDEBUG_TX
		printf("tl_ifstart: need to copy mbuf\n");
#endif
#ifdef TL_PRIV_STATS
		sc->oerr_mcopy++;
#endif
		MGETHDR(mn, M_DONTWAIT, MT_DATA);
		if (mn == NULL) {
			m_freem(mb_head);
			goto bad;
		}
		if (mb_head->m_pkthdr.len > MHLEN) {
			MCLGET(mn, M_DONTWAIT);
			if ((mn->m_flags & M_EXT) == 0) {
				m_freem(mn);
				m_freem(mb_head);
				goto bad;
			}
		}
		m_copydata(mb_head, 0, mb_head->m_pkthdr.len,
			mtod(mn, caddr_t));
		mn->m_pkthdr.len = mn->m_len = mb_head->m_pkthdr.len;
		m_freem(mb_head);
		mb_head = mn;
		goto tbdinit;
	}
	/* We are at end of mbuf chain. check the size and
	 * see if it needs to be extended
 	 */
	if (size < ETHER_MIN_TX) {
#ifdef DIAGNOSTIC
		if (segment >= TL_NSEG) {
			panic("tl_ifstart: to much segmets (%d)\n", segment);
		}
#endif
		/*
	 	 * add the nullbuf in the seg
	 	 */
		Tx->hw_list.seg[segment].data_count =
			ETHER_MIN_TX - size;
		Tx->hw_list.seg[segment].data_addr =
			vtophys(nullbuf);
		size = ETHER_MIN_TX;
		segment++;
	}
	/* The list is done, finish the list init */
	Tx->hw_list.seg[segment-1].data_count |=
		TL_LAST_SEG;
	Tx->hw_list.stat = (size << 16) | 0x3000;
#ifdef TLDEBUG_TX
	printf("%s: sending, Tx : stat = 0x%x\n", sc->sc_dev.dv_xname,
		Tx->hw_list.stat);
#if 0
	for(segment = 0; segment < TL_NSEG; segment++) {
		printf("    seg %d addr 0x%x len 0x%x\n",
			segment,
			Tx->hw_list.seg[segment].data_addr,
			Tx->hw_list.seg[segment].data_count);
	}
#endif
#endif
	sc->opkt++;
	if (sc->active_Tx == NULL) {
		sc->active_Tx = sc->last_Tx = Tx;
#ifdef TLDEBUG_TX
		printf("%s: Tx GO, addr=0x%x\n", sc->sc_dev.dv_xname,
			vtophys(&Tx->hw_list));
#endif
		TL_HR_WRITE(sc, TL_HOST_CH_PARM, vtophys(&Tx->hw_list));
		TL_HR_WRITE(sc, TL_HOST_CMD, HOST_CMD_GO);
	} else {
#ifdef TLDEBUG_TX
		printf("%s: Tx addr=0x%x queued\n", sc->sc_dev.dv_xname,
			vtophys(&Tx->hw_list));
#endif
		sc->last_Tx->hw_list.fwd = vtophys(&Tx->hw_list);
		sc->last_Tx->next = Tx;
		sc->last_Tx = Tx;
#ifdef DIAGNOSTIC
		if (sc->last_Tx->hw_list.fwd & 0x7)
				printf("%s: physical addr 0x%x of list not properly aligned\n",
					sc->sc_dev.dv_xname, sc->last_Rx->hw_list.fwd);
#endif
	}
#if NBPFILTER > 0
	/* Pass packet to bpf if there is a listener */
	if (ifp->if_bpf)
		bpf_mtap(ifp->if_bpf, mb_head);
#endif
	/* Set a 5 second timer just in case we don't hear from the card again. */
	ifp->if_timer = 5;

	goto txloop;
bad:
#ifdef TLDEBUG
	printf("tl_ifstart: Out of mbuf, Tx pkt lost\n");
#endif
	Tx->next = sc->Free_Tx;
	sc->Free_Tx = Tx;
	return;
}

static void
tl_ifwatchdog(ifp)
	struct ifnet *ifp;
{
	tl_softc_t *sc = ifp->if_softc;

	if ((ifp->if_flags & IFF_RUNNING) == 0)
		return;
	printf("%s: device timeout\n", sc->sc_dev.dv_xname);
	ifp->if_oerrors++;
	tl_init(sc);
}

static int
tl_mediachange(ifp)
	struct ifnet *ifp;
{

	if (ifp->if_flags & IFF_UP)
		tl_init(ifp->if_softc);
	return (0);
}

static void
tl_mediastatus(ifp, ifmr)
	struct ifnet *ifp;
	struct ifmediareq *ifmr;
{
	tl_softc_t *sc = ifp->if_softc;

	mii_pollstat(&sc->tl_mii);
	ifmr->ifm_active = sc->tl_mii.mii_media_active;
	ifmr->ifm_status = sc->tl_mii.mii_media_status;
}

static int tl_add_RxBuff(Rx, oldm)
	struct Rx_list *Rx;
	struct mbuf *oldm;
{
	struct mbuf *m;

	MGETHDR(m, M_DONTWAIT, MT_DATA);
	if (m != NULL) {
		MCLGET(m, M_DONTWAIT);
		if ((m->m_flags & M_EXT) == 0) {
			m_freem(m);
			if (oldm == NULL)
				return 0;
			m = oldm;
			m->m_data = m->m_ext.ext_buf;
		}
	} else {
		if (oldm == NULL)
			return 0;
		m = oldm;
		m->m_data = m->m_ext.ext_buf;
	}
	/*
	 * Move the data pointer up so that the incoming data packet
	 * will be 32-bit aligned.
	 */
	m->m_data += 2;

	/* (re)init the Rx_list struct */

	Rx->m = m;
	Rx->hw_list.stat = ((MCLBYTES -2) << 16) | 0x3000;
	Rx->hw_list.seg.data_count = (MCLBYTES -2);
	Rx->hw_list.seg.data_addr = vtophys(m->m_data);
	return (m != oldm);
}

static void tl_ticks(v)
	void *v;
{
	tl_softc_t *sc = v;

	tl_read_stats(sc);
	if (sc->opkt > 0) {
		if (sc->oerr_exesscoll > sc->opkt / 100) { /* exess collisions */
			if (sc->tl_flags & TL_IFACT) /* only print once */
						printf("%s: no carrier\n", sc->sc_dev.dv_xname);
					sc->tl_flags &= ~TL_IFACT;
				} else
					sc->tl_flags |= TL_IFACT;
				sc->oerr_exesscoll = sc->opkt = 0;
				sc->tl_lasttx = 0;
			} else {
				sc->tl_lasttx++;
				if (sc->tl_lasttx >= TL_IDLETIME) {
					/*
					 * No TX activity in the last TL_IDLETIME seconds.
					 * sends a LLC Class1 TEST pkt
					 */
					struct mbuf *m;
					int s;
					MGETHDR(m, M_DONTWAIT, MT_DATA);
					if (m != NULL) {
		#ifdef TLDEBUG
						printf("tl_ticks: sending LLC test pkt\n");
		#endif
						bcopy(sc->tl_enaddr,
							mtod(m, struct ether_header *)->ether_dhost, 6);
						bcopy(sc->tl_enaddr,
							mtod(m, struct ether_header *)->ether_shost, 6);
						mtod(m, struct ether_header *)->ether_type = htons(3);
						mtod(m, unsigned char *)[14] = 0;
						mtod(m, unsigned char *)[15] = 0;
						mtod(m, unsigned char *)[16] = 0xE3;
													/* LLC Class1 TEST (no poll) */
						m->m_len = m->m_pkthdr.len = sizeof(struct ether_header) + 3;
						s = splnet();
						IF_PREPEND(&sc->tl_if.if_snd, m);
						tl_ifstart(&sc->tl_if);
						splx(s);
					}
				}
			}

			/* read statistics every seconds */
			timeout(tl_ticks, v, hz);
		}

		static void
		tl_read_stats(sc)
			tl_softc_t *sc;
		{
			u_int32_t reg;
			int ierr_overr;
			int ierr_code;
			int ierr_crc;
			int oerr_underr;
			int oerr_deffered;
			int oerr_coll;
			int oerr_multicoll;
			int oerr_exesscoll;
			int oerr_latecoll;
			int oerr_carrloss;
			struct ifnet *ifp = &sc->tl_if;

			reg =  tl_intreg_read(sc, TL_INT_STATS_TX);
			ifp->if_opackets += reg & 0x00ffffff;
			oerr_underr = reg >> 24;

			reg =  tl_intreg_read(sc, TL_INT_STATS_RX);
			ifp->if_ipackets += reg & 0x00ffffff;
			ierr_overr = reg >> 24;

			reg =  tl_intreg_read(sc, TL_INT_STATS_FERR);
			ierr_crc = (reg & TL_FERR_CRC) >> 16;
			ierr_code = (reg & TL_FERR_CODE) >> 24;
			oerr_deffered = (reg & TL_FERR_DEF);

			reg =  tl_intreg_read(sc, TL_INT_STATS_COLL);
			oerr_multicoll = (reg & TL_COL_MULTI);
			oerr_coll = (reg & TL_COL_SINGLE) >> 16;

			reg =  tl_intreg_read(sc, TL_INT_LERR);
			oerr_exesscoll = (reg & TL_LERR_ECOLL);
			oerr_latecoll = (reg & TL_LERR_LCOLL) >> 8;
			oerr_carrloss = (reg & TL_LERR_CL) >> 16;


			sc->stats_exesscoll += oerr_exesscoll;
			ifp->if_oerrors += oerr_underr + oerr_exesscoll + oerr_latecoll +
				oerr_carrloss;
			ifp->if_collisions += oerr_coll + oerr_multicoll;
			ifp->if_ierrors += ierr_overr + ierr_code + ierr_crc;

			if (ierr_overr)
				printf("%s: receiver ring buffer overrun\n", sc->sc_dev.dv_xname);
			if (oerr_underr)
				printf("%s: transmit buffer underrun\n", sc->sc_dev.dv_xname);
		#ifdef TL_PRIV_STATS
			sc->ierr_overr		+= ierr_overr;
			sc->ierr_code		+= ierr_code;
			sc->ierr_crc		+= ierr_crc;
			sc->oerr_underr		+= oerr_underr;
			sc->oerr_deffered	+= oerr_deffered;
			sc->oerr_coll		+= oerr_coll;
			sc->oerr_multicoll	+= oerr_multicoll;
			sc->oerr_exesscoll	+= oerr_exesscoll;
			sc->oerr_latecoll	+= oerr_latecoll;
			sc->oerr_carrloss	+= oerr_carrloss;
		#endif
		}

		static void tl_addr_filter(sc)
			tl_softc_t *sc;
		{
			struct ether_multistep step;
			struct ether_multi *enm;
			u_int32_t hash[2] = {0, 0};
			int i;

			sc->tl_if.if_flags &= ~IFF_ALLMULTI;
			ETHER_FIRST_MULTI(step, &sc->tl_ec, enm);
			while (enm != NULL) {
		#ifdef TLDEBUG
				printf("tl_addr_filter: addrs %s %s\n", ether_sprintf(enm->enm_addrlo), ether_sprintf(enm->enm_addrhi));
		#endif
				if (memcmp(enm->enm_addrlo, enm->enm_addrhi, 6) == 0) {
					i = tl_multicast_hash(enm->enm_addrlo);
					hash[i/32] |= 1 << (i%32);
				} else {
					hash[0] = hash[1] = 0xffffffff;
					sc->tl_if.if_flags |= IFF_ALLMULTI;
					break;
				}
				ETHER_NEXT_MULTI(step, enm);
			}
		#ifdef TLDEBUG
			printf("tl_addr_filer: hash1 %x has2 %x\n", hash[0], hash[1]);
		#endif
			tl_intreg_write(sc, TL_INT_HASH1, hash[0]);
			tl_intreg_write(sc, TL_INT_HASH2, hash[1]);
		}

		static int tl_multicast_hash(a)
			u_int8_t *a;
		{
			int hash;

		#define DA(addr,bit) (addr[5 - (bit/8)] & (1 << bit%8))
		#define xor8(a,b,c,d,e,f,g,h) (((a != 0) + (b != 0) + (c != 0) + (d != 0) + (e != 0) + (f != 0) + (g != 0) + (h != 0)) & 1)

			hash  = xor8( DA(a,0), DA(a, 6), DA(a,12), DA(a,18), DA(a,24), DA(a,30),
				DA(a,36), DA(a,42));
			hash |= xor8( DA(a,1), DA(a, 7), DA(a,13), DA(a,19), DA(a,25), DA(a,31),
				DA(a,37), DA(a,43)) << 1;
			hash |= xor8( DA(a,2), DA(a, 8), DA(a,14), DA(a,20), DA(a,26), DA(a,32),
				DA(a,38), DA(a,44)) << 2;
			hash |= xor8( DA(a,3), DA(a, 9), DA(a,15), DA(a,21), DA(a,27), DA(a,33),
				DA(a,39), DA(a,45)) << 3;
			hash |= xor8( DA(a,4), DA(a,10), DA(a,16), DA(a,22), DA(a,28), DA(a,34),
				DA(a,40), DA(a,46)) << 4;
			hash |= xor8( DA(a,5), DA(a,11), DA(a,17), DA(a,23), DA(a,29), DA(a,35),
				DA(a,41), DA(a,47)) << 5;

			return hash;
		}

		#if defined(TLDEBUG_RX)
		void ether_printheader(eh)
			struct ether_header *eh;
		{
			u_char *c = (char*)eh;
			int i;
			for (i=0; i<sizeof(struct ether_header); i++)
				printf("%x ", (u_int)c[i]);
			printf("\n");
		}
#endif