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

/* $NetBSD: if_bce.c,v 1.1 2003/09/27 13:13:28 mrg Exp $	 */

/*
 * Copyright (c) 2003 Clifford Wright. 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. 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.
 */

/*
 * Broadcom BCM440x 10/100 ethernet (broadcom.com)
 * SiliconBackplane is technology from Sonics, Inc.(sonicsinc.com)
 *
 * Cliff Wright cliff (at) snipe444.org
 */

#include "bpfilter.h"
#include "vlan.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/socket.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/if_ether.h>

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

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

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

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

#include <dev/pci/if_bcereg.h>

#include <uvm/uvm_extern.h>

static int      bce_probe(struct device *, struct cfdata *, void *);
static void     bce_attach(struct device *, struct device *, void *);
static int      bce_ioctl(struct ifnet *, u_long, caddr_t);
static void bce_start __P((struct ifnet *));
static void bce_watchdog __P((struct ifnet *));
static int      bce_intr(void *);
static void bce_rxintr __P((struct bce_softc *));
static void bce_txintr __P((struct bce_softc *));
static int bce_init __P((struct ifnet *));
static void     bce_add_mac
                __P((struct bce_softc *, unsigned char *, unsigned long));
static int bce_add_rxbuf __P((struct bce_softc *, int));
static void bce_rxdrain __P((struct bce_softc *));
static void bce_stop __P((struct ifnet *, int));
static void bce_reset __P((struct bce_softc *));
static void bce_set_filter __P((struct ifnet *));
static int bce_mii_read __P((struct device *, int, int));
static void bce_mii_write __P((struct device *, int, int, int));
static void bce_statchg __P((struct device *));
static int bce_mediachange __P((struct ifnet *));
static void bce_mediastatus __P((struct ifnet *, struct ifmediareq *));
static void bce_tick __P((void *));

#define BCE_DEBUG
#ifdef BCE_DEBUG
#define DPRINTF(x)	if (bcedebug) printf x
#define DPRINTFN(n,x)	if (bcedebug >= (n)) printf x
int             bcedebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

/* for ring descriptors */
#define BCE_RXBUF_LEN	(MCLBYTES - 4)
#define BCE_INIT_RXDESC(sc, x)						\
do {									\
	struct bce_dma_slot *__bced = &sc->bce_rx_ring[x];		\
									\
	*mtod(sc->bce_cdata.bce_rx_chain[x], long *) = 0;		\
	__bced->addr =							\
	    htole32(sc->bce_cdata.bce_rx_map[x]->dm_segs[0].ds_addr	\
	    + 0x40000000);						\
	if (x != (BCE_NRXDESC - 1))					\
		__bced->ctrl = htole32(BCE_RXBUF_LEN);			\
	else								\
		__bced->ctrl = htole32(BCE_RXBUF_LEN | CTRL_EOT);	\
	bus_dmamap_sync(sc->bce_dmatag, sc->bce_ring_map,		\
	    sizeof(struct bce_dma_slot) * x,				\
	    sizeof(struct bce_dma_slot),				\
	    BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);			\
} while(0)

#ifdef OLDNETBSD
struct cfattach bce_ca = {
	sizeof(struct bce_softc), bce_probe, bce_attach
};
#else
CFATTACH_DECL(bce, sizeof(struct bce_softc),
	      bce_probe, bce_attach, NULL, NULL);
#endif

static const struct bce_product {
	pci_vendor_id_t bp_vendor;
	pci_product_id_t bp_product;
	const char     *bp_name;
} bce_products[] = {
	{
		PCI_VENDOR_BROADCOM,
		PCI_PRODUCT_BROADCOM_BCM4401,
		"Broadcom BCM4401 10/100 Ethernet"
	},
	{
		0,
		0,
		NULL
	},
};

static const struct bce_product *
bce_lookup(const struct pci_attach_args * pa)
{
	const struct bce_product *bp;

	for (bp = bce_products; bp->bp_name != NULL; bp++) {
		if (PCI_VENDOR(pa->pa_id) == bp->bp_vendor &&
		    PCI_PRODUCT(pa->pa_id) == bp->bp_product)
			return (bp);
	}

	return (NULL);
}

/*
 * Probe for a Broadcom chip. Check the PCI vendor and device IDs
 * against drivers product list, and return its name if a match is found.
 */
int
bce_probe(parent, match, aux)
	struct device  *parent;
	struct cfdata  *match;
	void           *aux;
{
	struct pci_attach_args *pa = (struct pci_attach_args *) aux;

	if (bce_lookup(pa) != NULL)
		return (1);

	return (0);
}

void
bce_attach(parent, self, aux)
	struct device  *parent, *self;
	void           *aux;
{
	struct bce_softc *sc = (struct bce_softc *) self;
	struct pci_attach_args *pa = aux;
	const struct bce_product *bp;
	pci_chipset_tag_t pc = pa->pa_pc;
	pci_intr_handle_t ih;
	const char     *intrstr = NULL;
	caddr_t         kva;
	bus_dma_segment_t seg;
	int             rseg;
	u_int32_t       command;
	struct ifnet   *ifp;
	pcireg_t        memtype;
	bus_addr_t      memaddr;
	bus_size_t      memsize;
	int             pmreg;
	pcireg_t        pmode;
	int             error;
	int             i;

	bp = bce_lookup(pa);
	KASSERT(bp != NULL);

	sc->bce_pa = *pa;
	sc->bce_dmatag = pa->pa_dmat;

	printf(": %s\n", bp->bp_name);
	/*
	 * following is for new aprint_naive(": Ethernet controller\n");
	 * aprint_normal(": %s\n", bp->bp_name);
	 */

	/*
	 * Map control/status registers.
	 */
	command = pci_conf_read(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
	command |= PCI_COMMAND_MEM_ENABLE | PCI_COMMAND_MASTER_ENABLE;
	pci_conf_write(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG, command);
	command = pci_conf_read(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);

	if (!(command & PCI_COMMAND_MEM_ENABLE)) {
		printf("%s: failed to enable memory mapping!\n",
		/*
		 * following line for new aprint_error("%s: failed to enable
		 * memory mapping!\n",
		 */
		       sc->bce_dev.dv_xname);
		return;
	}
	memtype = pci_mapreg_type(pa->pa_pc, pa->pa_tag, BCE_PCI_BAR0);
	switch (memtype) {
	case PCI_MAPREG_TYPE_MEM | PCI_MAPREG_MEM_TYPE_32BIT:
	case PCI_MAPREG_TYPE_MEM | PCI_MAPREG_MEM_TYPE_64BIT:
		if (pci_mapreg_map(pa, BCE_PCI_BAR0,
				memtype, 0, &sc->bce_btag, &sc->bce_bhandle,
				   &memaddr, &memsize) == 0)
			break;
	default:
		printf("%s: unable to find mem space\n",
		/*
		 * following for new aprint_error("%s: unable to find mem
		 * space\n",
		 */
		       sc->bce_dev.dv_xname);
		return;
	}

	/* Get it out of power save mode if needed. */
	if (pci_get_capability(pc, pa->pa_tag, PCI_CAP_PWRMGMT, &pmreg, 0)) {
		pmode = pci_conf_read(pc, pa->pa_tag, pmreg + 4) & 0x3;
		if (pmode == 3) {
			/*
			 * The card has lost all configuration data in
			 * this state, so punt.
			 */
			printf("%s: unable to wake up from power state D3\n",
			       sc->bce_dev.dv_xname);
			return;
		}
		if (pmode != 0) {
			printf("%s: waking up from power state D%d\n",
			       sc->bce_dev.dv_xname, pmode);
			pci_conf_write(pc, pa->pa_tag, pmreg + 4, 0);
		}
	}
	if (pci_intr_map(pa, &ih)) {
		printf("%s: couldn't map interrupt\n",
		/*
		 * following for new aprint_error("%s: couldn't map
		 * interrupt\n",
		 */
		       sc->bce_dev.dv_xname);
		return;
	}
	intrstr = pci_intr_string(pc, ih);

	sc->bce_intrhand = pci_intr_establish(pc, ih, IPL_NET, bce_intr, sc);

	if (sc->bce_intrhand == NULL) {
		printf("%s: couldn't establish interrupt",
		/*
		 * following for new aprint_error("%s: couldn't establish
		 * interrupt",
		 */
		       sc->bce_dev.dv_xname);
		if (intrstr != NULL)
			printf(" at %s", intrstr);
		/*
		 * following for new aprint_normal(" at %s", intrstr);
		 */
		printf("\n");
		/*
		 * following for new aprint_normal("\n");
		 */
		return;
	}
	printf("%s: interrupting at %s\n",
	/*
	 * following for new aprint_normal("%s: interrupting at %s\n",
	 */
	       sc->bce_dev.dv_xname, intrstr);

	/* reset the chip */
	bce_reset(sc);

	/*
	 * Allocate DMA-safe memory for ring descriptors.
	 * The receive, and transmit rings can not share the same
	 * 4k space, however both are allocated at once here.
	 */
	if ((error = bus_dmamem_alloc(sc->bce_dmatag,
				    2 * PAGE_SIZE, PAGE_SIZE, 2 * PAGE_SIZE,
				      &seg, 1, &rseg, BUS_DMA_NOWAIT))) {
		printf("%s: unable to alloc space for ring descriptors, "
		       "error = %d\n", sc->bce_dev.dv_xname, error);
		return;
	}
	/* map ring space to kernel */
	if ((error = bus_dmamem_map(sc->bce_dmatag, &seg, rseg,
				    2 * PAGE_SIZE, &kva, BUS_DMA_NOWAIT))) {
		printf("%s: unable to map DMA buffers, error = %d\n",
		       sc->bce_dev.dv_xname, error);
		bus_dmamem_free(sc->bce_dmatag, &seg, rseg);
		return;
	}
	/* create a dma map for the ring */
	if ((error = bus_dmamap_create(sc->bce_dmatag,
			 2 * PAGE_SIZE, 1, 2 * PAGE_SIZE, 0, BUS_DMA_NOWAIT,
				       &sc->bce_ring_map))) {
		printf("%s: unable to create ring DMA map, error = %d\n",
		       sc->bce_dev.dv_xname, error);
		bus_dmamem_unmap(sc->bce_dmatag, kva, 2 * PAGE_SIZE);
		bus_dmamem_free(sc->bce_dmatag, &seg, rseg);
		return;
	}
	/* connect the ring space to the dma map */
	if (bus_dmamap_load(sc->bce_dmatag, sc->bce_ring_map, kva,
			    2 * PAGE_SIZE, NULL, BUS_DMA_NOWAIT)) {
		bus_dmamap_destroy(sc->bce_dmatag, sc->bce_ring_map);
		bus_dmamem_unmap(sc->bce_dmatag, kva, 2 * PAGE_SIZE);
		bus_dmamem_free(sc->bce_dmatag, &seg, rseg);
		return;
	}
	/* save the ring space in softc */
	sc->bce_rx_ring = (struct bce_dma_slot *) kva;
	sc->bce_tx_ring = (struct bce_dma_slot *) (kva + PAGE_SIZE);

	/* Create the transmit buffer DMA maps. */
	for (i = 0; i < BCE_NTXDESC; i++) {
		if ((error = bus_dmamap_create(sc->bce_dmatag, MCLBYTES,
					       BCE_NTXFRAGS, MCLBYTES, 0, 0, &sc->bce_cdata.bce_tx_map[i])) != 0) {
			printf("%s: unable to create tx DMA map, error = %d\n",
			       sc->bce_dev.dv_xname, error);
		}
		sc->bce_cdata.bce_tx_chain[i] = NULL;
	}

	/* Create the receive buffer DMA maps. */
	for (i = 0; i < BCE_NRXDESC; i++) {
		if ((error = bus_dmamap_create(sc->bce_dmatag, MCLBYTES, 1,
		      MCLBYTES, 0, 0, &sc->bce_cdata.bce_rx_map[i])) != 0) {
			printf("%s: unable to create rx DMA map, error = %d\n",
			       sc->bce_dev.dv_xname, error);
		}
		sc->bce_cdata.bce_rx_chain[i] = NULL;
	}

	/* Set up ifnet structure */
	ifp = &sc->ethercom.ec_if;
	strcpy(ifp->if_xname, sc->bce_dev.dv_xname);
	ifp->if_softc = sc;
	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
	ifp->if_ioctl = bce_ioctl;
	ifp->if_start = bce_start;
	ifp->if_watchdog = bce_watchdog;
	ifp->if_init = bce_init;
	ifp->if_stop = bce_stop;
	IFQ_SET_READY(&ifp->if_snd);

	/* Initialize our media structures and probe the MII. */

	sc->bce_mii.mii_ifp = ifp;
	sc->bce_mii.mii_readreg = bce_mii_read;
	sc->bce_mii.mii_writereg = bce_mii_write;
	sc->bce_mii.mii_statchg = bce_statchg;
	ifmedia_init(&sc->bce_mii.mii_media, 0, bce_mediachange,
		     bce_mediastatus);
	mii_attach(&sc->bce_dev, &sc->bce_mii, 0xffffffff, MII_PHY_ANY,
		   MII_OFFSET_ANY, 0);
	if (LIST_FIRST(&sc->bce_mii.mii_phys) == NULL) {
		ifmedia_add(&sc->bce_mii.mii_media, IFM_ETHER | IFM_NONE, 0, NULL);
		ifmedia_set(&sc->bce_mii.mii_media, IFM_ETHER | IFM_NONE);
	} else
		ifmedia_set(&sc->bce_mii.mii_media, IFM_ETHER | IFM_AUTO);
	/* get the phy */
	sc->bce_phy =
		bus_space_read_1(sc->bce_btag, sc->bce_bhandle, 4096 + 90) & 0x1f;
	/*
	 * Enable activity led.
	 * XXX This should be in a phy driver, but not currently.
	 */
	bce_mii_write((struct device *) sc, 1, 26,
		      bce_mii_read((struct device *) sc, 1, 26) & 0x7fff);
	/* enable traffic meter led mode */
	bce_mii_write((struct device *) sc, 1, 26,
		      bce_mii_read((struct device *) sc, 1, 27) | (1 << 6));


	/* Attach the interface */
	if_attach(ifp);
	sc->enaddr[0] =
		bus_space_read_1(sc->bce_btag, sc->bce_bhandle, 4096 + 79);
	sc->enaddr[1] =
		bus_space_read_1(sc->bce_btag, sc->bce_bhandle, 4096 + 78);
	sc->enaddr[2] =
		bus_space_read_1(sc->bce_btag, sc->bce_bhandle, 4096 + 81);
	sc->enaddr[3] =
		bus_space_read_1(sc->bce_btag, sc->bce_bhandle, 4096 + 80);
	sc->enaddr[4] =
		bus_space_read_1(sc->bce_btag, sc->bce_bhandle, 4096 + 83);
	sc->enaddr[5] =
		bus_space_read_1(sc->bce_btag, sc->bce_bhandle, 4096 + 82);
	printf("%s: Ethernet address %s\n", sc->bce_dev.dv_xname,
	       ether_sprintf(sc->enaddr));
	ether_ifattach(ifp, sc->enaddr);
	callout_init(&sc->bce_timeout);
}

/* handle media, and ethernet requests */
static int
bce_ioctl(ifp, cmd, data)
	struct ifnet   *ifp;
	u_long          cmd;
	caddr_t         data;
{
	struct bce_softc *sc = ifp->if_softc;
	struct ifreq   *ifr = (struct ifreq *) data;
	int             s, error;

	s = splnet();
	switch (cmd) {
	case SIOCSIFMEDIA:
	case SIOCGIFMEDIA:
		error = ifmedia_ioctl(ifp, ifr, &sc->bce_mii.mii_media, cmd);
		break;
	default:
		error = ether_ioctl(ifp, cmd, data);
		if (error == ENETRESET) {
			/* change multicast list */
			error = 0;
		}
		break;
	}

	/* Try to get more packets going. */
	bce_start(ifp);

	splx(s);
	return error;
}

/* Start packet transmission on the interface. */
static void
bce_start(ifp)
	struct ifnet   *ifp;
{
	struct bce_softc *sc = ifp->if_softc;
	struct mbuf    *m0;
	bus_dmamap_t    dmamap;
	int             txstart;
	int             txsfree;
	int             newpkts = 0;
	int             error;

	/*
         * do not start another if currently transmitting, and more
         * descriptors(tx slots) are needed for next packet.
         */
	if ((ifp->if_flags & (IFF_RUNNING | IFF_OACTIVE)) != IFF_RUNNING)
		return;

	/* determine number of descriptors available */
	if (sc->bce_txsnext >= sc->bce_txin)
		txsfree = BCE_NTXDESC - 1 + sc->bce_txin - sc->bce_txsnext;
	else
		txsfree = sc->bce_txin - sc->bce_txsnext - 1;

	/*
         * Loop through the send queue, setting up transmit descriptors
         * until we drain the queue, or use up all available transmit
         * descriptors.
         */
	while (txsfree > 0) {
		int             seg;

		/* Grab a packet off the queue. */
		IFQ_POLL(&ifp->if_snd, m0);
		if (m0 == NULL)
			break;

		/* get the transmit slot dma map */
		dmamap = sc->bce_cdata.bce_tx_map[sc->bce_txsnext];

		/*
		 * Load the DMA map.  If this fails, the packet either
		 * didn't fit in the alloted number of segments, or we
		 * were short on resources. If the packet will not fit,
		 * it will be dropped. If short on resources, it will
		 * be tried again later.
		 */
		error = bus_dmamap_load_mbuf(sc->bce_dmatag, dmamap, m0,
					     BUS_DMA_WRITE | BUS_DMA_NOWAIT);
		if (error == EFBIG) {
			printf("%s: Tx packet consumes too many "
			"DMA segments, dropping...\n", sc->bce_dev.dv_xname);
			IFQ_DEQUEUE(&ifp->if_snd, m0);
			m_freem(m0);
			ifp->if_oerrors++;
			continue;
		} else if (error) {
			/* short on resources, come back later */
			printf("%s: unable to load Tx buffer, "
			       "error = %d\n", sc->bce_dev.dv_xname, error);
			break;
		}
		/* If not enough descriptors available, try again later */
		if (dmamap->dm_nsegs > txsfree) {
			ifp->if_flags |= IFF_OACTIVE;
			bus_dmamap_unload(sc->bce_dmatag, dmamap);
			break;
		}
		/* WE ARE NOW COMMITTED TO TRANSMITTING THE PACKET. */

		/* So take it off the queue */
		IFQ_DEQUEUE(&ifp->if_snd, m0);

		/* save the pointer so it can be freed later */
		sc->bce_cdata.bce_tx_chain[sc->bce_txsnext] = m0;

		/* Sync the data DMA map. */
		bus_dmamap_sync(sc->bce_dmatag, dmamap, 0, dmamap->dm_mapsize,
				BUS_DMASYNC_PREWRITE);

		/* Initialize the transmit descriptor(s). */
		txstart = sc->bce_txsnext;
		for (seg = 0; seg < dmamap->dm_nsegs; seg++) {
			unsigned long   ctrl;

			ctrl = dmamap->dm_segs[seg].ds_len & CTRL_BC_MASK;
			if (seg == 0)
				ctrl |= CTRL_SOF;
			if (seg == dmamap->dm_nsegs - 1)
				ctrl |= CTRL_EOF;
			if (sc->bce_txsnext == BCE_NTXDESC - 1)
				ctrl |= CTRL_EOT;
			ctrl |= CTRL_IOC;
			sc->bce_tx_ring[sc->bce_txsnext].ctrl = ctrl;
			sc->bce_tx_ring[sc->bce_txsnext].addr =
				dmamap->dm_segs[seg].ds_addr + 0x40000000;
			if (sc->bce_txsnext + 1 > BCE_NTXDESC - 1)
				sc->bce_txsnext = 0;
			else
				sc->bce_txsnext++;
			txsfree--;
		}
		/* sync descriptors being used */
		bus_dmamap_sync(sc->bce_dmatag, sc->bce_ring_map,
			  sizeof(struct bce_dma_slot) * txstart + PAGE_SIZE,
			     sizeof(struct bce_dma_slot) * dmamap->dm_nsegs,
				BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);

		/* Give the packet to the chip. */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_DPTR,
			     sc->bce_txsnext * sizeof(struct bce_dma_slot));

		newpkts++;

#if NBPFILTER > 0
		/* Pass the packet to any BPF listeners. */
		if (ifp->if_bpf)
			bpf_mtap(ifp->if_bpf, m0);
#endif				/* NBPFILTER > 0 */
	}
	if (txsfree == 0) {
		/* No more slots left; notify upper layer. */
		ifp->if_flags |= IFF_OACTIVE;
	}
	if (newpkts) {
		/* Set a watchdog timer in case the chip flakes out. */
		ifp->if_timer = 5;
	}
}

/* Watchdog timer handler. */
static void
bce_watchdog(ifp)
	struct ifnet   *ifp;
{
	struct bce_softc *sc = ifp->if_softc;

	printf("%s: device timeout\n", sc->bce_dev.dv_xname);
	ifp->if_oerrors++;

	(void) bce_init(ifp);

	/* Try to get more packets going. */
	bce_start(ifp);
}

int
bce_intr(xsc)
	void           *xsc;
{
	struct bce_softc *sc;
	struct ifnet   *ifp;
	unsigned long   intstatus;
	unsigned long   intmask;
	int             wantinit;
	int             handled = 0;

	sc = xsc;
	ifp = &sc->ethercom.ec_if;


	for (wantinit = 0; wantinit == 0;) {
		intstatus =
			bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_INT_STS);
		intmask = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_INT_MASK);

		/* ignore if not ours, or unsolicited interrupts */
		intstatus &= intmask;
		if (intstatus == 0)
			break;

		handled = 1;

		/* Ack interrupt */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_INT_STS,
				  intstatus);

		/* Receive interrupts. */
		if (intstatus & I_RI) {
			bce_rxintr(sc);
		}
		/* Transmit interrupts. */
		if (intstatus & I_XI) {
			bce_txintr(sc);
		}
		/* Error interrupts */
		if (intstatus & ~(I_RI | I_XI)) {
			if (intstatus & I_XU)
				printf("%s: transmit fifo underflow\n", sc->bce_dev.dv_xname);
			if (intstatus & I_RO) {
				printf("%s: receive fifo overflow\n", sc->bce_dev.dv_xname);
				ifp->if_ierrors++;
			}
			if (intstatus & I_RU)
				printf("%s: receive descriptor underflow\n",
				       sc->bce_dev.dv_xname);
			if (intstatus & I_DE)
				printf("%s: descriptor protocol error\n",
				       sc->bce_dev.dv_xname);
			if (intstatus & I_PD)
				printf("%s: data error\n", sc->bce_dev.dv_xname);
			if (intstatus & I_PC)
				printf("%s: descriptor error\n", sc->bce_dev.dv_xname);
			if (intstatus & I_TO)
				printf("%s: general purpose timeout\n", sc->bce_dev.dv_xname);
			wantinit = 1;
		}
	}

	if (handled) {
		if (wantinit)
			bce_init(ifp);
		/* Try to get more packets going. */
		bce_start(ifp);
	}
	return (handled);
}

/* Receive interrupt handler */
void
bce_rxintr(sc)
	struct bce_softc *sc;
{
	struct ifnet   *ifp = &sc->ethercom.ec_if;
	struct rx_pph  *pph;
	struct mbuf    *m;
	int             curr;
	int             len;
	int             i;

	/* get pointer to active receive slot */
	curr = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_RXSTATUS)
		& RS_CD_MASK;
	curr = curr / sizeof(struct bce_dma_slot);
	if (curr >= BCE_NRXDESC)
		curr = BCE_NRXDESC - 1;

	/* process packets up to but not current packet being worked on */
	for (i = sc->bce_rxin; i != curr; i + 1 > BCE_NRXDESC - 1 ? i = 0 : i++) {

		/* complete any post dma memory ops on packet */
		bus_dmamap_sync(sc->bce_dmatag, sc->bce_cdata.bce_rx_map[i], 0,
				sc->bce_cdata.bce_rx_map[i]->dm_mapsize, BUS_DMASYNC_POSTREAD);

		/*
		 * If the packet had an error, simply recycle the buffer,
		 * resetting the len, and flags.
		 */
		pph = mtod(sc->bce_cdata.bce_rx_chain[i], struct rx_pph *);
		if (pph->flags & (RXF_NO | RXF_RXER | RXF_CRC | RXF_OV)) {
			ifp->if_ierrors++;
			pph->len = 0;
			pph->flags = 0;
			continue;
		}
		/* receive the packet */
		len = pph->len;
		if (len == 0)
			continue;	/* no packet if empty */
		pph->len = 0;
		pph->flags = 0;
		/* bump past pre header to packet */
		sc->bce_cdata.bce_rx_chain[i]->m_data += 30;

		/*
		 * If the packet is small enough to fit in a
		 * single header mbuf, allocate one and copy
		 * the data into it.  This greatly reduces
		 * memory consumption when receiving lots
		 * of small packets.
		 *
		 * Otherwise, add a new buffer to the receive
		 * chain.  If this fails, drop the packet and
		 * recycle the old buffer.
		 */
		if (len <= (MHLEN - 2)) {
			MGETHDR(m, M_DONTWAIT, MT_DATA);
			if (m == NULL)
				goto dropit;
			m->m_data += 2;
			memcpy(mtod(m, caddr_t),
			 mtod(sc->bce_cdata.bce_rx_chain[i], caddr_t), len);
			sc->bce_cdata.bce_rx_chain[i]->m_data -= 30;
		} else {
			m = sc->bce_cdata.bce_rx_chain[i];
			if (bce_add_rxbuf(sc, i) != 0) {
		dropit:
				ifp->if_ierrors++;
				/* continue to use old buffer */
				sc->bce_cdata.bce_rx_chain[i]->m_data -= 30;
				bus_dmamap_sync(sc->bce_dmatag,
					     sc->bce_cdata.bce_rx_map[i], 0,
				    sc->bce_cdata.bce_rx_map[i]->dm_mapsize,
						BUS_DMASYNC_PREREAD);
				continue;
			}
		}

		m->m_flags |= M_HASFCS;
		m->m_pkthdr.rcvif = ifp;
		m->m_pkthdr.len = m->m_len = len;
		ifp->if_ipackets++;

#if NBPFILTER > 0
		/*
		 * Pass this up to any BPF listeners, but only
		 * pass it up the stack if it's for us.
		 */
		if (ifp->if_bpf)
			bpf_mtap(ifp->if_bpf, m);
#endif				/* NBPFILTER > 0 */

		/* Pass it on. */
		(*ifp->if_input) (ifp, m);

		/* re-check current in case it changed */
		curr =
			(bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_RXSTATUS) &
			 RS_CD_MASK) / sizeof(struct bce_dma_slot);
		if (curr >= BCE_NRXDESC)
			curr = BCE_NRXDESC - 1;
	}
	sc->bce_rxin = curr;
}

/* Transmit interrupt handler */
void
bce_txintr(sc)
	struct bce_softc *sc;
{
	struct ifnet   *ifp = &sc->ethercom.ec_if;
	int             curr;
	int             i;

	ifp->if_flags &= ~IFF_OACTIVE;

	/*
         * Go through the Tx list and free mbufs for those
         * frames which have been transmitted.
         */
	curr = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_TXSTATUS) &
		RS_CD_MASK;
	curr = curr / sizeof(struct bce_dma_slot);
	if (curr >= BCE_NTXDESC)
		curr = BCE_NTXDESC - 1;
	for (i = sc->bce_txin; i != curr; i + 1 > BCE_NTXDESC - 1 ? i = 0 : i++) {

		/* do any post dma memory ops on transmit data */
		if (sc->bce_cdata.bce_tx_chain[i] == NULL)
			continue;
		bus_dmamap_sync(sc->bce_dmatag, sc->bce_cdata.bce_tx_map[i], 0,
				sc->bce_cdata.bce_tx_map[i]->dm_mapsize, BUS_DMASYNC_POSTWRITE);
		bus_dmamap_unload(sc->bce_dmatag,
				  sc->bce_cdata.bce_tx_map[i]);
		m_freem(sc->bce_cdata.bce_tx_chain[i]);
		sc->bce_cdata.bce_tx_chain[i] = NULL;
		ifp->if_opackets++;
	}
	sc->bce_txin = curr;

	/*
	 * If there are no more pending transmissions, cancel the watchdog
	 * timer
	 */
	if (sc->bce_txsnext == sc->bce_txin)
		ifp->if_timer = 0;
}

/* initialize the interface */
static int
bce_init(ifp)
	struct ifnet   *ifp;
{
	struct bce_softc *sc = ifp->if_softc;
	unsigned long   reg_win;
	int             error;
	int             i;

	/* Cancel any pending I/O. */
	bce_stop(ifp, 0);

	/* enable pci inerrupts, bursts, and prefetch */

	/* remap the pci registers to the Sonics config registers */

	/* save the current map, so it can be restored */
	reg_win =
		pci_conf_read(sc->bce_pa.pa_pc, sc->bce_pa.pa_tag, BCE_REG_WIN);
	/* set register window to Sonics registers */
	pci_conf_write(sc->bce_pa.pa_pc, sc->bce_pa.pa_tag, BCE_REG_WIN,
		       BCE_SONICS_WIN);

	/* enable SB to PCI interrupt */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_SBINTVEC,
	     bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_SBINTVEC) |
			  SBIV_ENET0);

	/* enable prefetch and bursts for sonics-to-pci translation 2 */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_SPCI_TR2,
	     bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_SPCI_TR2) |
			  SBTOPCI_PREF | SBTOPCI_BURST);

	/* restore to ethernet register space */
	pci_conf_write(sc->bce_pa.pa_pc, sc->bce_pa.pa_tag, BCE_REG_WIN,
		       reg_win);

	/* Reset the chip to a known state. */
	bce_reset(sc);

	/* Initialize transmit descriptors */
	memset(sc->bce_tx_ring, 0, BCE_NTXDESC * sizeof(struct bce_dma_slot));
	sc->bce_txsnext = 0;
	sc->bce_txin = 0;

	/* enable crc32 generation */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_MACCTL,
			  bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_MACCTL) | BCE_EMC_CG);

	/* setup DMA interrupt control */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DMAI_CTL, 1 << 24);

	/* setup packet filter */
	bce_set_filter(ifp);

	/* set max frame length, account for possible vlan tag */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_RX_MAX,
			  ETHER_MAX_LEN + 32);
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_TX_MAX,
			  ETHER_MAX_LEN + 32);

	/* set tx watermark */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_TX_WATER, 56);

	/* enable transmit */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_TXCTL, XC_XE);
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_TXADDR,
			  htole32(sc->bce_ring_map->dm_segs[0].ds_addr + PAGE_SIZE + 0x40000000));

	/*
         * Give the receive ring to the chip, and
         * start the receive DMA engine.
         */
	sc->bce_rxin = 0;

	/* clear the rx descriptor ring */
	memset(sc->bce_rx_ring, 0, BCE_NRXDESC * sizeof(struct bce_dma_slot));
	/* enable receive */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_RXCTL,
			  30 << 1 | 1);
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_RXADDR,
		htole32(sc->bce_ring_map->dm_segs[0].ds_addr + 0x40000000));

	/* Initalize receive descriptors */
	for (i = 0; i < BCE_NRXDESC; i++) {
		if (sc->bce_cdata.bce_rx_chain[i] == NULL) {
			if ((error = bce_add_rxbuf(sc, i)) != 0) {
				printf("%s: unable to allocate or map rx(%d) mbuf, error = %d\n"
				       ,sc->bce_dev.dv_xname, i, error);
				bce_rxdrain(sc);
				return (error);
			}
		} else
			BCE_INIT_RXDESC(sc, i);
	}

	/* Enable interrupts */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_INT_MASK,
	      I_XI | I_RI | I_XU | I_RO | I_RU | I_DE | I_PD | I_PC | I_TO);

	/* start the receive dma */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_RXDPTR,
			  BCE_NRXDESC * sizeof(struct bce_dma_slot));

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

	/* turn on the ethernet mac */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_ENET_CTL,
			  bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_ENET_CTL) | EC_EE);

	/* start timer */
	callout_reset(&sc->bce_timeout, hz, bce_tick, sc);

	/* mark as running, and no outputs active */
	ifp->if_flags |= IFF_RUNNING;
	ifp->if_flags &= ~IFF_OACTIVE;

	return 0;
}

/* add a mac address to packet filter */
void
bce_add_mac(sc, mac, idx)
	struct bce_softc *sc;
	unsigned char  *mac;
	unsigned long   idx;
{
	int             i;
	unsigned long   rval;

	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_FILT_LOW,
			mac[2] << 24 | mac[3] << 16 | mac[4] << 8 | mac[5]);
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_FILT_HI,
			  mac[0] << 8 | mac[1] | 0x10000);
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_FILT_CTL,
			  idx << 16 | 8);
	/* wait for write to complete */
	for (i = 0; i < 100; i++) {
		rval = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_FILT_CTL);
		if (!(rval & 0x80000000))
			break;
		delay(10);
	}
	if (i == 100) {
		printf("%s: timed out writting pkt filter ctl\n", sc->bce_dev.dv_xname);
	}
}

/* Add a receive buffer to the indiciated descriptor. */
static int
bce_add_rxbuf(sc, idx)
	struct bce_softc *sc;
	int             idx;
{
	struct mbuf    *m;
	int             error;

	MGETHDR(m, M_DONTWAIT, MT_DATA);
	if (m == NULL)
		return (ENOBUFS);

	MCLGET(m, M_DONTWAIT);
	if ((m->m_flags & M_EXT) == 0) {
		m_freem(m);
		return (ENOBUFS);
	}
	if (sc->bce_cdata.bce_rx_chain[idx] != NULL)
		bus_dmamap_unload(sc->bce_dmatag, sc->bce_cdata.bce_rx_map[idx]);

	sc->bce_cdata.bce_rx_chain[idx] = m;

	error = bus_dmamap_load(sc->bce_dmatag, sc->bce_cdata.bce_rx_map[idx],
				m->m_ext.ext_buf, m->m_ext.ext_size, NULL, BUS_DMA_READ | BUS_DMA_NOWAIT);
	if (error)
		return (error);

	bus_dmamap_sync(sc->bce_dmatag, sc->bce_cdata.bce_rx_map[idx], 0,
	    sc->bce_cdata.bce_rx_map[idx]->dm_mapsize, BUS_DMASYNC_PREREAD);

	BCE_INIT_RXDESC(sc, idx);

	return (0);

}

/* Drain the receive queue. */
static void
bce_rxdrain(sc)
	struct bce_softc *sc;
{
	int             i;

	for (i = 0; i < BCE_NRXDESC; i++) {
		if (sc->bce_cdata.bce_rx_chain[i] != NULL) {
			bus_dmamap_unload(sc->bce_dmatag, sc->bce_cdata.bce_rx_map[i]);
			m_freem(sc->bce_cdata.bce_rx_chain[i]);
			sc->bce_cdata.bce_rx_chain[i] = NULL;
		}
	}
}

/* Stop transmission on the interface */
static void
bce_stop(ifp, disable)
	struct ifnet   *ifp;
	int             disable;
{
	struct bce_softc *sc = ifp->if_softc;
	int             i;
	unsigned long   val;

	/* Stop the 1 second timer */
	callout_stop(&sc->bce_timeout);

	/* Down the MII. */
	mii_down(&sc->bce_mii);

	/* Disable interrupts. */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_INT_MASK, 0);
	bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_INT_MASK);

	/* Disable emac */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_ENET_CTL, EC_ED);
	for (i = 0; i < 200; i++) {
		val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_ENET_CTL);
		if (!(val & EC_ED))
			break;
		delay(10);
	}

	/* Stop the DMA */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_RXCTL, 0);
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_TXCTL, 0);
	delay(10);

	/* Release any queued transmit buffers. */
	for (i = 0; i < BCE_NTXDESC; i++) {
		if (sc->bce_cdata.bce_tx_chain[i] != NULL) {
			bus_dmamap_unload(sc->bce_dmatag, sc->bce_cdata.bce_tx_map[i]);
			m_freem(sc->bce_cdata.bce_tx_chain[i]);
			sc->bce_cdata.bce_tx_chain[i] = NULL;
		}
	}

	/* drain receive queue */
	if (disable)
		bce_rxdrain(sc);

	/* Mark the interface down and cancel the watchdog timer. */
	ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
	ifp->if_timer = 0;

}

/* reset the chip */
static void
bce_reset(sc)
	struct bce_softc *sc;
{
	unsigned long   val;
	unsigned long   sbval;
	int             i;

	/* if SB core is up */
	sbval = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATELOW);
	if ((sbval & (SBTML_RESET | SBTML_REJ | SBTML_CLK)) == SBTML_CLK) {
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DMAI_CTL, 0);

		/* disable emac */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_ENET_CTL, EC_ED);
		for (i = 0; i < 200; i++) {
			val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_ENET_CTL);
			if (!(val & EC_ED))
				break;
			delay(10);
		}
		if (i == 200)
			printf("%s: timed out disabling ethernet mac\n",
			       sc->bce_dev.dv_xname);

		/* reset the dma engines */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_TXCTL, 0);
		val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_RXSTATUS);
		/* if error on receive, wait to go idle */
		if (val & 0xf0000) {
			for (i = 0; i < 100; i++) {
				val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle,
						       BCE_DMA_RXSTATUS);
				if (val & 0x2000)
					break;
				delay(10);
			}
			if (i == 100)
				printf("%s: receive dma did not go idle after error\n",
				       sc->bce_dev.dv_xname);
		}
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DMA_RXSTATUS, 0);

		/* reset ethernet mac */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_ENET_CTL, EC_ES);
		for (i = 0; i < 200; i++) {
			val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_ENET_CTL);
			if (!(val & EC_ES))
				break;
			delay(10);
		}
		if (i == 200)
			printf("%s: timed out restting ethernet mac\n",
			       sc->bce_dev.dv_xname);
	} else {
		unsigned long   reg_win;

		/* remap the pci registers to the Sonics config registers */

		/* save the current map, so it can be restored */
		reg_win =
			pci_conf_read(sc->bce_pa.pa_pc, sc->bce_pa.pa_tag, BCE_REG_WIN);
		/* set register window to Sonics registers */
		pci_conf_write(sc->bce_pa.pa_pc, sc->bce_pa.pa_tag, BCE_REG_WIN,
			       BCE_SONICS_WIN);

		/* enable SB to PCI interrupt */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_SBINTVEC,
				  bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_SBINTVEC) |
				  SBIV_ENET0);

		/* enable prefetch and bursts for sonics-to-pci translation 2 */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_SPCI_TR2,
				  bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_SPCI_TR2) |
				  SBTOPCI_PREF | SBTOPCI_BURST);

		/* restore to ethernet register space */
		pci_conf_write(sc->bce_pa.pa_pc, sc->bce_pa.pa_tag, BCE_REG_WIN,
			       reg_win);
	}

	/* disable SB core if not in reset */
	if (!(sbval & SBTML_RESET)) {

		/* set the reject bit */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATELOW,
				  SBTML_REJ | SBTML_CLK);
		for (i = 0; i < 200; i++) {
			val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle,
					       BCE_SBTMSTATELOW);
			if (val & SBTML_REJ)
				break;
			delay(1);
		}
		if (val == 200)
			printf("%s: while restting core, reject did not set\n",
			       sc->bce_dev.dv_xname);
		/* wait until busy is clear */
		for (i = 0; i < 200; i++) {
			val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle,
					       BCE_SBTMSTATEHI);
			if (!(val & 0x4))
				break;
			delay(1);
		}
		if (i == 200)
			printf("%s: while restting core, busy did not clear\n",
			       sc->bce_dev.dv_xname);
		/* set reset and reject while enabling the clocks */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATELOW,
			   SBTML_FGC | SBTML_CLK | SBTML_REJ | SBTML_RESET);
		val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATELOW);
		delay(10);
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATELOW,
				  SBTML_REJ | SBTML_RESET);
		delay(1);
	}
	/* enable clock */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATELOW,
			  SBTML_FGC | SBTML_CLK | SBTML_RESET);
	val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATELOW);
	delay(1);

	/* clear any error bits that may be on */
	val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATEHI);
	if (val & 1)
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATEHI,
				  0);
	val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_SBIMSTATE);
	if (val & 0x60000)
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_SBIMSTATE,
				  val & ~0x60000);

	/* clear reset and allow it to propagate throughout the core */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATELOW,
			  SBTML_FGC | SBTML_CLK);
	val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATELOW);
	delay(1);

	/* leave clock enabled */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATELOW,
			  SBTML_CLK);
	val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_SBTMSTATELOW);
	delay(1);

	/* initialize MDC preamble, frequency */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_MI_CTL, 0x8d);

	/* enable phy, differs for internal, and external */
	val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_DEVCTL);
	if (!(val & BCE_DC_IP)) {
		/* select external phy */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_ENET_CTL, EC_EP);
	} else if (val & BCE_DC_ER) {	/* internal, clear reset bit if on */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_DEVCTL,
				  val & ~BCE_DC_ER);
		delay(100);
	}
}

/* Set up the receive filter. */
void
bce_set_filter(ifp)
	struct ifnet   *ifp;
{
	struct bce_softc *sc = ifp->if_softc;

	if (ifp->if_flags & IFF_PROMISC) {
		ifp->if_flags |= IFF_ALLMULTI;
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_RX_CTL,
				  bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_RX_CTL) | ERC_PE);
	} else {
		ifp->if_flags &= ~IFF_ALLMULTI;

		/* turn off promiscuous */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_RX_CTL,
		bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_RX_CTL) &
				  ~ERC_PE);

		/* enable/disable broadcast */
		if (ifp->if_flags & IFF_BROADCAST)
			bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_RX_CTL,
					  bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_RX_CTL) &
					  ~ERC_DB);
		else
			bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_RX_CTL,
					  bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_RX_CTL) |
					  ERC_DB);

		/* disable the filter */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_FILT_CTL, 0);

		/* add our own address */
		bce_add_mac(sc, sc->enaddr, 0);

		/* for now accept all multicast */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_RX_CTL,
		bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_RX_CTL) |
				  ERC_AM);
		ifp->if_flags |= IFF_ALLMULTI;

		/* enable the filter */
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_FILT_CTL,
				  bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_FILT_CTL) | 1);
	}
}

/* Read a PHY register on the MII. */
int
bce_mii_read(self, phy, reg)
	struct device  *self;
	int             phy, reg;
{
	struct bce_softc *sc = (struct bce_softc *) self;
	int             i;
	unsigned long   val;

	/* clear mii_int */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_MI_STS, BCE_MIINTR);

	/* Read the PHY register */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_MI_COMM,
			  (MII_COMMAND_READ << 28) | (MII_COMMAND_START << 30) | (MII_COMMAND_ACK << 16)
			  | BCE_MIPHY(phy) | BCE_MIREG(reg));

	for (i = 0; i < BCE_TIMEOUT; i++) {
		val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_MI_STS);
		if (val & BCE_MIINTR)
			break;
		delay(10);
	}
	val = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_MI_COMM);
	if (i == BCE_TIMEOUT) {
		printf("%s: PHY read timed out reading phy %d, reg %d, val = 0x%08lx\n"
		       ,sc->bce_dev.dv_xname, phy, reg, val);
		return (0);
	}
	return (val & BCE_MICOMM_DATA);
}

/* Write a PHY register on the MII */
void
bce_mii_write(self, phy, reg, val)
	struct device  *self;
	int             phy, reg, val;
{
	struct bce_softc *sc = (struct bce_softc *) self;
	int             i;
	unsigned long   rval;

	/* clear mii_int */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_MI_STS, BCE_MIINTR);

	/* Write the PHY register */
	bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_MI_COMM,
			  (MII_COMMAND_WRITE << 28) | (MII_COMMAND_START << 30) | (MII_COMMAND_ACK << 16)
			  | (val & BCE_MICOMM_DATA)
			  | BCE_MIPHY(phy) | BCE_MIREG(reg));

	/* wait for write to complete */
	for (i = 0; i < BCE_TIMEOUT; i++) {
		rval = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_MI_STS);
		if (rval & BCE_MIINTR)
			break;
		delay(10);
	}
	rval = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_MI_COMM);
	if (i == BCE_TIMEOUT) {
		printf("%s: PHY timed out writting phy %d, reg %d, val = 0x%08x\n"
		       ,sc->bce_dev.dv_xname, phy, reg, val);
	}
}

/* sync hardware duplex mode to software state */
void
bce_statchg(self)
	struct device  *self;
{
	struct bce_softc *sc = (struct bce_softc *) self;
	unsigned long   reg;

	/* if needed, change register to match duplex mode */
	reg = bus_space_read_4(sc->bce_btag, sc->bce_bhandle, BCE_TX_CTL);
	if (sc->bce_mii.mii_media_active & IFM_FDX && !(reg & EXC_FD))
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_TX_CTL,
				  reg | EXC_FD);
	else if (!(sc->bce_mii.mii_media_active & IFM_FDX) && reg & EXC_FD)
		bus_space_write_4(sc->bce_btag, sc->bce_bhandle, BCE_TX_CTL,
				  reg & ~EXC_FD);

	/*
         * Enable activity led.
         * XXX This should be in a phy driver, but not currently.
         */
	bce_mii_write((struct device *) sc, 1, 26,
		      bce_mii_read((struct device *) sc, 1, 26) & 0x7fff);
	/* enable traffic meter led mode */
	bce_mii_write((struct device *) sc, 1, 26,
		      bce_mii_read((struct device *) sc, 1, 27) | (1 << 6));
}

/* Set hardware to newly-selected media */
int
bce_mediachange(ifp)
	struct ifnet   *ifp;
{
	struct bce_softc *sc = ifp->if_softc;

	if (ifp->if_flags & IFF_UP)
		mii_mediachg(&sc->bce_mii);
	return (0);
}

/* Get the current interface media status */
static void
bce_mediastatus(ifp, ifmr)
	struct ifnet   *ifp;
	struct ifmediareq *ifmr;
{
	struct bce_softc *sc = ifp->if_softc;

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

/* One second timer, checks link status */
static void
bce_tick(v)
	void           *v;
{
	struct bce_softc *sc = v;

	/* Tick the MII. */
	mii_tick(&sc->bce_mii);

	callout_reset(&sc->bce_timeout, hz, bce_tick, sc);
}