NetBSD/sys/dev/qbus/if_de.c

/*	$NetBSD: if_de.c,v 1.9 2001/04/26 19:36:07 ragge Exp $	*/

/*
 * Copyright (c) 1982, 1986, 1989 Regents of the University of California.
 * Copyright (c) 2000 Ludd, University of Lule}, Sweden.
 * 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 the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *	@(#)if_de.c	7.12 (Berkeley) 12/16/90
 */

/*
 * DEC DEUNA interface
 *
 *	Lou Salkind
 *	New York University
 *
 *	Rewritten by Ragge 30 April 2000 to match new world.
 *
 * TODO:
 *	timeout routine (get statistics)
 */

#include "opt_inet.h"
#include "bpfilter.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/buf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/errno.h>
#include <sys/syslog.h>
#include <sys/device.h>

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

#ifdef INET
#include <netinet/in.h>
#include <netinet/if_inarp.h>
#endif

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

#include <machine/bus.h>

#include <dev/qbus/ubavar.h>
#include <dev/qbus/if_dereg.h>

#include "ioconf.h"

/*
 * Be careful with transmit/receive buffers, each entry steals 4 map
 * registers, and there is only 496 on one unibus...
 */
#define NRCV	10	/* number of receive buffers (must be > 1) */
#define NXMT	10	/* number of transmit buffers */

/*
 * Structure containing the elements that must be in DMA-safe memory.
 */
struct	de_cdata {
	/* the following structures are always mapped in */
	struct	de_pcbb dc_pcbb;	/* port control block */
	struct	de_ring dc_xrent[NXMT]; /* transmit ring entrys */
	struct	de_ring dc_rrent[NRCV]; /* receive ring entrys */
	struct	de_udbbuf dc_udbbuf;	/* UNIBUS data buffer */
	/* end mapped area */
};

/*
 * Ethernet software status per interface.
 *
 * Each interface is referenced by a network interface structure,
 * ds_if, which the routing code uses to locate the interface.
 * This structure contains the output queue for the interface, its address, ...
 * We also have, for each interface, a UBA interface structure, which
 * contains information about the UNIBUS resources held by the interface:
 * map registers, buffered data paths, etc.  Information is cached in this
 * structure for use by the if_uba.c routines in running the interface
 * efficiently.
 */
struct	de_softc {
	struct	device sc_dev;		/* Configuration common part */
	struct	evcnt sc_intrcnt;	/* Interrupt counting */
	struct	ethercom sc_ec;		/* Ethernet common part */
#define sc_if	sc_ec.ec_if		/* network-visible interface */
	bus_space_tag_t sc_iot;
	bus_addr_t sc_ioh;
	bus_dma_tag_t sc_dmat;
	struct ubinfo sc_ui;
	struct de_cdata *sc_dedata;	/* Control structure */
	struct de_cdata *sc_pdedata;	/* Bus-mapped control structure */
	bus_dmamap_t sc_rcvmap[NRCV];	/* unibus receive maps */
	struct mbuf *sc_rxmbuf[NRCV];
	bus_dmamap_t sc_xmtmap[NXMT];
	struct mbuf *sc_txmbuf[NXMT];
	char sc_xbuf[NXMT][ETHER_MAX_LEN];
	int	sc_xindex;		/* UNA index into transmit chain */
	int	sc_rindex;		/* UNA index into receive chain */
	int	sc_xfree;		/* index for next transmit buffer */
	int	sc_nxmit;		/* # of transmits in progress */
	void *sc_sh;			/* shutdownhook cookie */
};

static	int dematch(struct device *, struct cfdata *, void *);
static	void deattach(struct device *, struct device *, void *);
static	void dewait(struct de_softc *, char *);
static	void deinit(struct de_softc *);
static	int deioctl(struct ifnet *, u_long, caddr_t);
static	void dereset(struct device *);
static	void destart(struct ifnet *);
static	void derecv(struct de_softc *);
static	void deintr(void *);
static	int de_add_rxbuf(struct de_softc *, int);
static	void deshutdown(void *);

struct	cfattach de_ca = {
	sizeof(struct de_softc), dematch, deattach
};

#define DE_WCSR(csr, val) \
	bus_space_write_2(sc->sc_iot, sc->sc_ioh, csr, val)
#define DE_WLOW(val) \
	bus_space_write_1(sc->sc_iot, sc->sc_ioh, DE_PCSR0, val)
#define DE_WHIGH(val) \
	bus_space_write_1(sc->sc_iot, sc->sc_ioh, DE_PCSR0 + 1, val)
#define DE_RCSR(csr) \
	bus_space_read_2(sc->sc_iot, sc->sc_ioh, csr)

#define LOWORD(x)	((int)(x) & 0xffff)
#define HIWORD(x)	(((int)(x) >> 16) & 0x3)
/*
 * Interface exists: make available by filling in network interface
 * record.  System will initialize the interface when it is ready
 * to accept packets.  We get the ethernet address here.
 */
void
deattach(struct device *parent, struct device *self, void *aux)
{
	struct uba_attach_args *ua = aux;
	struct de_softc *sc = (struct de_softc *)self;
	struct ifnet *ifp = &sc->sc_if;
	u_int8_t myaddr[ETHER_ADDR_LEN];
	int csr1, error, i;
	char *c;

	sc->sc_iot = ua->ua_iot;
	sc->sc_ioh = ua->ua_ioh;
	sc->sc_dmat = ua->ua_dmat;

	/*
	 * What kind of a board is this?
	 * The error bits 4-6 in pcsr1 are a device id as long as
	 * the high byte is zero.
	 */
	csr1 = DE_RCSR(DE_PCSR1);
	if (csr1 & 0xff60)
		c = "broken";
	else if (csr1 & 0x10)
		c = "delua";
	else
		c = "deuna";

	/*
	 * Reset the board and temporarily map
	 * the pcbb buffer onto the Unibus.
	 */
	DE_WCSR(DE_PCSR0, 0);		/* reset INTE */
	DELAY(100);
	DE_WCSR(DE_PCSR0, PCSR0_RSET);
	dewait(sc, "reset");

	sc->sc_ui.ui_size = sizeof(struct de_cdata);
	if ((error = ubmemalloc((struct uba_softc *)parent, &sc->sc_ui, 0))) {
		printf(": unable to ubmemalloc(), error = %d\n", error);
		return;
	}
	sc->sc_pdedata = (struct de_cdata *)sc->sc_ui.ui_baddr;
	sc->sc_dedata = (struct de_cdata *)sc->sc_ui.ui_vaddr;

	/*
	 * Create receive buffer DMA maps.
	 */
	for (i = 0; i < NRCV; i++) {
		if ((error = bus_dmamap_create(sc->sc_dmat, MCLBYTES, 1,
		    MCLBYTES, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
		    &sc->sc_rcvmap[i]))) {
			printf(": unable to create rx DMA map %d, error = %d\n",
			    i, error);
			goto fail_5;
		}
	}

	/*
	 * Pre-allocate the receive buffers.
	 */
	for (i = 0; i < NRCV; i++) {
		if ((error = de_add_rxbuf(sc, i)) != 0) {
			printf(": unable to allocate or map rx buffer %d\n,"
			    " error = %d\n", i, error);
			goto fail_6;
		}
	}

	/*
	 * Pre-allocate the transmit buffers.
	 */
	for (i = 0; i < NXMT; i++) {
		if ((error = bus_dmamap_create(sc->sc_dmat, MCLBYTES, 1,
		    MCLBYTES, 0, BUS_DMA_NOWAIT|BUS_DMA_ALLOCNOW,
		    &sc->sc_xmtmap[i]))) {
			printf(": unable to create tx DMA map %d, error = %d\n",
			    i, error);
			goto fail_7;
		}
	}

	/*
	 * Tell the DEUNA about our PCB
	 */
	DE_WCSR(DE_PCSR2, LOWORD(sc->sc_pdedata));
	DE_WCSR(DE_PCSR3, HIWORD(sc->sc_pdedata));
	DE_WLOW(CMD_GETPCBB);
	dewait(sc, "pcbb");

	sc->sc_dedata->dc_pcbb.pcbb0 = FC_RDPHYAD;
	DE_WLOW(CMD_GETCMD);
	dewait(sc, "read addr ");

	bcopy((caddr_t)&sc->sc_dedata->dc_pcbb.pcbb2, myaddr, sizeof (myaddr));
	printf("\n%s: %s, hardware address %s\n", sc->sc_dev.dv_xname, c,
		ether_sprintf(myaddr));

	uba_intr_establish(ua->ua_icookie, ua->ua_cvec, deintr, sc, 
	    &sc->sc_intrcnt);
	uba_reset_establish(dereset, &sc->sc_dev);
	evcnt_attach_dynamic(&sc->sc_intrcnt, EVCNT_TYPE_INTR, ua->ua_evcnt,
	    sc->sc_dev.dv_xname, "intr");

	strcpy(ifp->if_xname, sc->sc_dev.dv_xname);
	ifp->if_softc = sc;
	ifp->if_flags = IFF_BROADCAST|IFF_SIMPLEX|IFF_MULTICAST|IFF_ALLMULTI;
	ifp->if_ioctl = deioctl;
	ifp->if_start = destart;
	IFQ_SET_READY(&ifp->if_snd);

	if_attach(ifp);
	ether_ifattach(ifp, myaddr);

	sc->sc_sh = shutdownhook_establish(deshutdown, sc);
	return;

	/*
	 * Free any resources we've allocated during the failed attach
	 * attempt.  Do this in reverse order and fall through.
	 */
fail_7:
	for (i = 0; i < NXMT; i++)
		if (sc->sc_xmtmap[i] != NULL)
			bus_dmamap_destroy(sc->sc_dmat, sc->sc_xmtmap[i]);
fail_6:
	for (i = 0; i < NRCV; i++) {
		if (sc->sc_rxmbuf[i] != NULL) {
			bus_dmamap_unload(sc->sc_dmat, sc->sc_rcvmap[i]);
			m_freem(sc->sc_rxmbuf[i]);
		}
	}
fail_5:
	for (i = 0; i < NRCV; i++) {
		if (sc->sc_rcvmap[i] != NULL)
			bus_dmamap_destroy(sc->sc_dmat, sc->sc_rcvmap[i]);
	}
}

/*
 * Reset of interface after UNIBUS reset.
 */
void
dereset(struct device *dev)
{
	struct de_softc *sc = (void *)dev;

	sc->sc_if.if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
	sc->sc_pdedata = NULL;	/* All mappings lost */
	DE_WCSR(DE_PCSR0, PCSR0_RSET);
	dewait(sc, "reset");
	deinit(sc);
}

/*
 * Initialization of interface; clear recorded pending
 * operations, and reinitialize UNIBUS usage.
 */
void
deinit(struct de_softc *sc)
{
	struct de_cdata *dc, *pdc;
	int s, i;

	if (sc->sc_if.if_flags & IFF_RUNNING)
		return;
	/*
	 * Tell the DEUNA about our PCB
	 */
	DE_WCSR(DE_PCSR2, LOWORD(sc->sc_pdedata));
	DE_WCSR(DE_PCSR3, HIWORD(sc->sc_pdedata));
	DE_WLOW(0);		/* reset INTE */
	DELAY(500);
	DE_WLOW(CMD_GETPCBB);
	dewait(sc, "pcbb");

	dc = sc->sc_dedata;
	pdc = sc->sc_pdedata;
	/* set the transmit and receive ring header addresses */
	dc->dc_pcbb.pcbb0 = FC_WTRING;
	dc->dc_pcbb.pcbb2 = LOWORD(&pdc->dc_udbbuf);
	dc->dc_pcbb.pcbb4 = HIWORD(&pdc->dc_udbbuf);

	dc->dc_udbbuf.b_tdrbl = LOWORD(&pdc->dc_xrent[0]);
	dc->dc_udbbuf.b_tdrbh = HIWORD(&pdc->dc_xrent[0]);
	dc->dc_udbbuf.b_telen = sizeof (struct de_ring) / sizeof(u_int16_t);
	dc->dc_udbbuf.b_trlen = NXMT;
	dc->dc_udbbuf.b_rdrbl = LOWORD(&pdc->dc_rrent[0]);
	dc->dc_udbbuf.b_rdrbh = HIWORD(&pdc->dc_rrent[0]);
	dc->dc_udbbuf.b_relen = sizeof (struct de_ring) / sizeof(u_int16_t);
	dc->dc_udbbuf.b_rrlen = NRCV;

	DE_WLOW(CMD_GETCMD);
	dewait(sc, "wtring");

	sc->sc_dedata->dc_pcbb.pcbb0 = FC_WTMODE;
	sc->sc_dedata->dc_pcbb.pcbb2 = MOD_TPAD|MOD_HDX|MOD_DRDC|MOD_ENAL;
	DE_WLOW(CMD_GETCMD);
	dewait(sc, "wtmode");

	/* set up the receive and transmit ring entries */
	for (i = 0; i < NXMT; i++)
		dc->dc_xrent[i].r_flags = 0;

	for (i = 0; i < NRCV; i++)
		dc->dc_rrent[i].r_flags = RFLG_OWN;

	/* start up the board (rah rah) */
	s = splnet();
	sc->sc_rindex = sc->sc_xindex = sc->sc_xfree = sc->sc_nxmit = 0;
	sc->sc_if.if_flags |= IFF_RUNNING;
	DE_WLOW(PCSR0_INTE);			/* avoid interlock */
	destart(&sc->sc_if);		/* queue output packets */
	DE_WLOW(CMD_START|PCSR0_INTE);
	splx(s);
}

/*
 * Setup output on interface.
 * Get another datagram to send off of the interface queue,
 * and map it to the interface before starting the output.
 * Must be called from ipl >= our interrupt level.
 */
void
destart(struct ifnet *ifp)
{
	struct de_softc *sc = ifp->if_softc;
	struct de_cdata *dc;
	struct de_ring *rp, *rp2;
	struct mbuf *m;
	int nxmit, buffer, freeb, freeb2;

	/*
	 * the following test is necessary, since
	 * the code is not reentrant and we have
	 * multiple transmission buffers.
	 */
	if (sc->sc_if.if_flags & IFF_OACTIVE)
		return;
	dc = sc->sc_dedata;
	for (nxmit = sc->sc_nxmit; nxmit < NXMT; nxmit++) {
		IFQ_DEQUEUE(&ifp->if_snd, m);
		if (m == 0)
			break;
		freeb = sc->sc_xfree;
		rp = &dc->dc_xrent[freeb];
		if (rp->r_flags & XFLG_OWN)
			panic("deuna xmit in progress");

		/*
		 * One or two mbufs: DMA out of those mbufs.
		 * Three or more: copy to the preallocated buffer space.
		 * XXX - should use bus_dmamap_load_mbuf().
		 */
		rp->r_tdrerr = 0;
		if (m->m_next == NULL) {
			bus_dmamap_load(sc->sc_dmat, sc->sc_xmtmap[freeb],
			    mtod(m, void *), m->m_len, 0, 0);
			buffer = sc->sc_xmtmap[freeb]->dm_segs[0].ds_addr;
			rp->r_slen = m->m_pkthdr.len;
			rp->r_segbl = LOWORD(buffer);
			rp->r_segbh = HIWORD(buffer);
			rp->r_flags = XFLG_STP|XFLG_ENP|XFLG_OWN;
		} else if (m->m_next->m_next == NULL) {
			if (nxmit+1 == NXMT) {
				IF_PREPEND(&ifp->if_snd, m);
				goto out;
			}
			freeb2 = (freeb+1 == NXMT ? 0 : freeb+1);
			rp2 = &dc->dc_xrent[freeb2];
			bus_dmamap_load(sc->sc_dmat, sc->sc_xmtmap[freeb],
			    mtod(m, void *), m->m_len, 0, 0);
			buffer = sc->sc_xmtmap[freeb]->dm_segs[0].ds_addr;
			rp->r_slen = m->m_len;
			rp->r_segbl = LOWORD(buffer);
			rp->r_segbh = HIWORD(buffer);
			bus_dmamap_load(sc->sc_dmat, sc->sc_xmtmap[freeb2],
			    mtod(m->m_next, void *), m->m_next->m_len, 0, 0);
			buffer = sc->sc_xmtmap[freeb2]->dm_segs[0].ds_addr;
			rp2->r_slen = m->m_next->m_len;
			rp2->r_segbl = LOWORD(buffer);
			rp2->r_segbh = HIWORD(buffer);
			rp2->r_flags = XFLG_ENP|XFLG_OWN;
			rp->r_flags = XFLG_STP|XFLG_OWN;
			nxmit++;
			sc->sc_xfree = freeb2;

		} else {
			m_copydata(m, 0, m->m_pkthdr.len,
			    &sc->sc_xbuf[freeb][0]);

			bus_dmamap_load(sc->sc_dmat, sc->sc_xmtmap[freeb],
			    &sc->sc_xbuf[freeb][0], m->m_pkthdr.len, 0, 0);
			buffer = sc->sc_xmtmap[freeb]->dm_segs[0].ds_addr;
			rp->r_segbl = LOWORD(buffer);
			rp->r_segbh = HIWORD(buffer);
			rp->r_slen = m->m_pkthdr.len;
			rp->r_flags = XFLG_STP|XFLG_ENP|XFLG_OWN;
		}

		sc->sc_txmbuf[sc->sc_xfree] = m;

#if NBPFILTER > 0
		if (ifp->if_bpf)
			bpf_mtap(ifp->if_bpf, m);
#endif

		sc->sc_xfree++;
		if (sc->sc_xfree == NXMT)
			sc->sc_xfree = 0;
	}
out:	if (sc->sc_nxmit != nxmit) {
		sc->sc_nxmit = nxmit;
		if (ifp->if_flags & IFF_RUNNING)
			DE_WLOW(PCSR0_INTE|CMD_PDMD);
	}
}

/*
 * Command done interrupt.
 */
void
deintr(void *arg)
{
	struct de_cdata *dc;
	struct de_softc *sc = arg;
	struct de_ring *rp;
	short csr0;

	/* save flags right away - clear out interrupt bits */
	csr0 = DE_RCSR(DE_PCSR0);
	DE_WHIGH(csr0 >> 8);


	sc->sc_if.if_flags |= IFF_OACTIVE;	/* prevent entering destart */
	/*
	 * if receive, put receive buffer on mbuf
	 * and hang the request again
	 */
	derecv(sc);

	/*
	 * Poll transmit ring and check status.
	 * Be careful about loopback requests.
	 * Then free buffer space and check for
	 * more transmit requests.
	 */
	dc = sc->sc_dedata;
	for ( ; sc->sc_nxmit > 0; sc->sc_nxmit--) {
		rp = &dc->dc_xrent[sc->sc_xindex];
		if (rp->r_flags & XFLG_OWN)
			break;
		bus_dmamap_unload(sc->sc_dmat, sc->sc_xmtmap[sc->sc_xindex]);
		if (sc->sc_txmbuf[sc->sc_xindex]) {
			m_freem(sc->sc_txmbuf[sc->sc_xindex]);
			sc->sc_txmbuf[sc->sc_xindex] = NULL;
		}
		sc->sc_if.if_opackets++;
		/* check for unusual conditions */
		if (rp->r_flags & (XFLG_ERRS|XFLG_MTCH|XFLG_ONE|XFLG_MORE)) {
			if (rp->r_flags & XFLG_ERRS) {
				/* output error */
				sc->sc_if.if_oerrors++;
			} else if (rp->r_flags & XFLG_ONE) {
				/* one collision */
				sc->sc_if.if_collisions++;
			} else if (rp->r_flags & XFLG_MORE) {
				/* more than one collision */
				sc->sc_if.if_collisions += 2;	/* guess */
			}
		}
		/* check if next transmit buffer also finished */
		sc->sc_xindex++;
		if (sc->sc_xindex == NXMT)
			sc->sc_xindex = 0;
	}
	sc->sc_if.if_flags &= ~IFF_OACTIVE;
	destart(&sc->sc_if);

	if (csr0 & PCSR0_RCBI) {
		DE_WLOW(PCSR0_INTE|CMD_PDMD);
	}
}

/*
 * Ethernet interface receiver interface.
 * If input error just drop packet.
 * Otherwise purge input buffered data path and examine 
 * packet to determine type.  If can't determine length
 * from type, then have to drop packet.	 Othewise decapsulate
 * packet based on type and pass to type specific higher-level
 * input routine.
 */
void
derecv(struct de_softc *sc)
{
	struct ifnet *ifp = &sc->sc_if;
	struct de_ring *rp;
	struct de_cdata *dc;
	struct mbuf *m;
	int len;

	dc = sc->sc_dedata;
	rp = &dc->dc_rrent[sc->sc_rindex];
	while ((rp->r_flags & RFLG_OWN) == 0) {
		sc->sc_if.if_ipackets++;
		len = (rp->r_lenerr&RERR_MLEN) - ETHER_CRC_LEN;
		/* check for errors */
		if ((rp->r_flags & (RFLG_ERRS|RFLG_FRAM|RFLG_OFLO|RFLG_CRC)) ||
		    (rp->r_lenerr & (RERR_BUFL|RERR_UBTO))) {
			sc->sc_if.if_ierrors++;
			goto next;
		}
		m = sc->sc_rxmbuf[sc->sc_rindex];
#if NBPFILTER > 0
		if (ifp->if_bpf)
			bpf_mtap(ifp->if_bpf, m);
#endif

		if (de_add_rxbuf(sc, sc->sc_rindex) == 0) {
			m->m_pkthdr.rcvif = ifp;
			m->m_pkthdr.len = m->m_len = len;
			(*ifp->if_input)(ifp, m);
		} else
			sc->sc_if.if_ierrors++;

		/* hang the receive buffer again */
next:		rp->r_lenerr = 0;
		rp->r_flags = RFLG_OWN;

		/* check next receive buffer */
		sc->sc_rindex++;
		if (sc->sc_rindex == NRCV)
			sc->sc_rindex = 0;
		rp = &dc->dc_rrent[sc->sc_rindex];
	}
}

/*
 * Add a receive buffer to the indicated descriptor.
 */
int
de_add_rxbuf(sc, i) 
	struct de_softc *sc;
	int i;
{
	struct mbuf *m;
	struct de_ring *rp;
	vaddr_t addr;
	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->sc_rxmbuf[i] != NULL)
		bus_dmamap_unload(sc->sc_dmat, sc->sc_rcvmap[i]);

	error = bus_dmamap_load(sc->sc_dmat, sc->sc_rcvmap[i],
	    m->m_ext.ext_buf, m->m_ext.ext_size, NULL, BUS_DMA_NOWAIT);
	if (error)
		panic("%s: can't load rx DMA map %d, error = %d\n",
		    sc->sc_dev.dv_xname, i, error);
	sc->sc_rxmbuf[i] = m;

	bus_dmamap_sync(sc->sc_dmat, sc->sc_rcvmap[i], 0,
	    sc->sc_rcvmap[i]->dm_mapsize, BUS_DMASYNC_PREREAD);

	/*
	 * We know that the mbuf cluster is page aligned. Also, be sure
	 * that the IP header will be longword aligned.
	 */
	m->m_data += 2;
	addr = sc->sc_rcvmap[i]->dm_segs[0].ds_addr + 2;
	rp = &sc->sc_dedata->dc_rrent[i];
	rp->r_lenerr = 0;
	rp->r_segbl = LOWORD(addr);
	rp->r_segbh = HIWORD(addr);
	rp->r_slen = m->m_ext.ext_size - 2;
	rp->r_flags = RFLG_OWN;

	return (0);
}


/*
 * Process an ioctl request.
 */
int
deioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
	struct ifaddr *ifa = (struct ifaddr *)data;
	struct ifreq *ifr = (struct ifreq *)data;
	struct de_softc *sc = ifp->if_softc;
	int s = splnet(), error = 0;

	switch (cmd) {

	case SIOCSIFADDR:
		ifp->if_flags |= IFF_UP;
		switch (ifa->ifa_addr->sa_family) {
#ifdef INET
		case AF_INET:
			deinit(sc);
			arp_ifinit(ifp, ifa);
			break;
#endif
		}
		break;

	case SIOCSIFFLAGS:
		if ((ifp->if_flags & IFF_UP) == 0 &&
		    (ifp->if_flags & IFF_RUNNING) != 0) {
			/*
			 * If interface is marked down and it is running,
			 * stop it.
			 */
			DE_WLOW(0);
			DELAY(5000);
			DE_WLOW(PCSR0_RSET);
			ifp->if_flags &= ~(IFF_RUNNING|IFF_OACTIVE);
		} else if ((ifp->if_flags & IFF_UP) != 0 &&
			   (ifp->if_flags & IFF_RUNNING) == 0) {
			/*
			 * If interface it marked up and it is stopped, then
			 * start it.
			 */
			deinit(sc);
		} else if ((ifp->if_flags & IFF_UP) != 0) {
			/*
			 * Send a new setup packet to match any new changes.
			 * (Like IFF_PROMISC etc)
			 */
			sc->sc_dedata->dc_pcbb.pcbb0 = FC_WTMODE;
			sc->sc_dedata->dc_pcbb.pcbb2 =
			    MOD_TPAD|MOD_HDX|MOD_DRDC|MOD_ENAL;
			if (ifp->if_flags & IFF_PROMISC)
				sc->sc_dedata->dc_pcbb.pcbb2 |= MOD_PROM;
			DE_WLOW(CMD_GETCMD|PCSR0_INTE);
			dewait(sc, "chgmode");
		}
		break;

	case SIOCADDMULTI:
	case SIOCDELMULTI:
		/*
		 * Update our multicast list.
		 */
		error = (cmd == SIOCADDMULTI) ?
			ether_addmulti(ifr, &sc->sc_ec):
			ether_delmulti(ifr, &sc->sc_ec);

		if (error == ENETRESET) {
			/*
			 * Multicast list has changed; set the hardware filter
			 * accordingly.
			 */
			error = 0;
		}
		break;

	default:
		error = EINVAL;
	}
	splx(s);
	return (error);
}

/*
 * Await completion of the named function
 * and check for errors.
 */
void
dewait(struct de_softc *sc, char *fn)
{
	int csr0;

	while ((DE_RCSR(DE_PCSR0) & PCSR0_INTR) == 0)
		;
	csr0 = DE_RCSR(DE_PCSR0);
	DE_WHIGH(csr0 >> 8);
	if (csr0 & PCSR0_PCEI) {
		char bits[64];
		printf("%s: %s failed, csr0=%s ", sc->sc_dev.dv_xname, fn,
		    bitmask_snprintf(csr0, PCSR0_BITS, bits, sizeof(bits)));
		printf("csr1=%s\n", bitmask_snprintf(DE_RCSR(DE_PCSR1),
		    PCSR1_BITS, bits, sizeof(bits)));
	}
}

int
dematch(struct device *parent, struct cfdata *cf, void *aux)
{
	struct uba_attach_args *ua = aux;
	struct de_softc ssc;
	struct de_softc *sc = &ssc;
	int i;

	sc->sc_iot = ua->ua_iot;
	sc->sc_ioh = ua->ua_ioh;
	/*
	 * Make sure self-test is finished before we screw with the board.
	 * Self-test on a DELUA can take 15 seconds (argh).
	 */
	for (i = 0;
	    (i < 160) &&
	    (DE_RCSR(DE_PCSR0) & PCSR0_FATI) == 0 &&
	    (DE_RCSR(DE_PCSR1) & PCSR1_STMASK) == STAT_RESET;
	    ++i)
		DELAY(50000);
	if (((DE_RCSR(DE_PCSR0) & PCSR0_FATI) != 0) ||
	    (((DE_RCSR(DE_PCSR1) & PCSR1_STMASK) != STAT_READY) &&
	    ((DE_RCSR(DE_PCSR1) & PCSR1_STMASK) != STAT_RUN)))
		return(0);

	DE_WCSR(DE_PCSR0, 0);
	DELAY(5000);
	DE_WCSR(DE_PCSR0, PCSR0_RSET);
	while ((DE_RCSR(DE_PCSR0) & PCSR0_INTR) == 0)
		;
	/* make board interrupt by executing a GETPCBB command */
	DE_WCSR(DE_PCSR0, PCSR0_INTE);
	DE_WCSR(DE_PCSR2, 0);
	DE_WCSR(DE_PCSR3, 0);
	DE_WCSR(DE_PCSR0, PCSR0_INTE|CMD_GETPCBB);
	DELAY(50000);

	return 1;
}

void
deshutdown(void *arg)
{
	struct de_softc *sc = arg;

	DE_WCSR(DE_PCSR0, 0);
	DELAY(1000);
	DE_WCSR(DE_PCSR0, PCSR0_RSET);
	dewait(sc, "shutdown");
}