On my 10th wedding anniversary I am celebrating by

committing this driver for technology from back when I got married :-)
It is for DEC EtherWorks cards, and comes from NetBSD.  I have done severe
KNF, and fixed the driver to work with PIO-only cards. Enjoy!

1 files changed, 1111 insertions, 0 deletions

diff --git a/sys/dev/ic/lemac.c b/sys/dev/ic/lemac.c
new file mode 100644
index 00000000000..e31b3476adb
--- /dev/null
+++ b/sys/dev/ic/lemac.c
@@ -0,0 +1,1111 @@
+/* $OpenBSD: lemac.c,v 1.1 2001/07/13 17:26:44 niklas Exp $ */
+/* $NetBSD: lemac.c,v 1.20 2001/06/13 10:46:02 wiz Exp $ */
+
+/*-
+ * Copyright (c) 1994, 1995, 1997 Matt Thomas <matt@3am-software.com>
+ * 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. 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.
+ */
+
+/*
+ * DEC EtherWORKS 3 Ethernet Controllers
+ *
+ * Written by Matt Thomas
+ * BPF support code stolen directly from if_ec.c
+ *
+ *   This driver supports the LEMAC DE203/204/205 cards.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/mbuf.h>
+#include <sys/protosw.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <sys/errno.h>
+#include <sys/malloc.h>
+#include <sys/device.h>
+
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/if_dl.h>
+#include <net/route.h>
+#include <net/if_media.h>
+
+#ifdef INET
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/in_var.h>
+#include <netinet/ip.h>
+#include <netinet/if_ether.h>
+#endif
+
+#ifdef NS
+#include <netns/ns.h>
+#include <netns/ns_if.h>
+#endif
+
+#include <machine/bus.h>
+
+#include <dev/ic/lemacreg.h>
+#include <dev/ic/lemacvar.h>
+
+#if 0
+#include <uvm/uvm_extern.h>
+#endif
+
+#include "bpfilter.h"
+#if NBPFILTER > 0
+#include <net/bpf.h>
+#endif
+
+int	lemac_ifioctl(struct ifnet *, u_long, caddr_t);
+int	lemac_ifmedia_change(struct ifnet *const);
+void	lemac_ifmedia_status(struct ifnet *const, struct ifmediareq *);
+void	lemac_ifstart(struct ifnet *);
+void	lemac_init(struct lemac_softc *);
+void	lemac_init_adapmem(struct lemac_softc *);
+void	lemac_input(struct lemac_softc *, bus_addr_t, size_t);
+void	lemac_multicast_filter(struct lemac_softc *);
+void	lemac_multicast_op(u_int16_t *, const u_char *, int);
+int	lemac_read_eeprom(struct lemac_softc *);
+int	lemac_read_macaddr(unsigned char *, const bus_space_tag_t,
+    const bus_space_handle_t, const bus_addr_t, int);
+void	lemac_reset(struct lemac_softc *);
+void	lemac_rne_intr(struct lemac_softc *);
+void	lemac_rxd_intr(struct lemac_softc *, unsigned);
+void	lemac_tne_intr(struct lemac_softc *);
+void	lemac_txd_intr(struct lemac_softc *, unsigned);
+
+struct cfdriver lc_cd = {
+	NULL, "lc", DV_IFNET
+};
+
+static const u_int16_t lemac_allmulti_mctbl[16] = {
+	0xFFFFU, 0xFFFFU, 0xFFFFU, 0xFFFFU,
+	0xFFFFU, 0xFFFFU, 0xFFFFU, 0xFFFFU,
+	0xFFFFU, 0xFFFFU, 0xFFFFU, 0xFFFFU,
+	0xFFFFU, 0xFFFFU, 0xFFFFU, 0xFFFFU,
+};
+
+/*
+ * Some tuning/monitoring variables.
+ */
+unsigned lemac_txmax = 16;
+
+void
+lemac_rxd_intr(struct lemac_softc *sc, unsigned cs_value)
+{
+	/*
+	 * Handle CS_RXD (Receiver disabled) here.
+	 *
+	 * Check Free Memory Queue Count. If not equal to zero
+	 * then just turn Receiver back on. If it is equal to
+	 * zero then check to see if transmitter is disabled.
+	 * Process transmit TXD loop once more.  If all else
+	 * fails then do software init (0xC0 to EEPROM Init)
+	 * and rebuild Free Memory Queue.
+	 */
+
+	sc->sc_cntrs.cntr_rxd_intrs++;
+
+	/*
+	 *  Re-enable Receiver.
+	 */
+
+	cs_value &= ~LEMAC_CS_RXD;
+	LEMAC_OUTB(sc, LEMAC_REG_CS, cs_value);
+
+	if (LEMAC_INB(sc, LEMAC_REG_FMC) > 0)
+		return;
+
+	if (cs_value & LEMAC_CS_TXD)
+		lemac_txd_intr(sc, cs_value);
+
+	if ((LEMAC_INB(sc, LEMAC_REG_CS) & LEMAC_CS_RXD) == 0)
+		return;
+
+	printf("%s: fatal RXD error, attempting recovery\n",
+	    sc->sc_if.if_xname);
+
+	lemac_reset(sc);
+	if (sc->sc_if.if_flags & IFF_UP) {
+		lemac_init(sc);
+		return;
+	}
+
+	/*
+	 *  Error during initializion.  Mark card as disabled.
+	 */
+	printf("%s: recovery failed -- board disabled\n", sc->sc_if.if_xname);
+}
+
+void
+lemac_tne_intr(struct lemac_softc *sc)
+{
+	unsigned txcount = LEMAC_INB(sc, LEMAC_REG_TDC);
+
+	sc->sc_cntrs.cntr_tne_intrs++;
+	while (txcount-- > 0) {
+		unsigned txsts = LEMAC_INB(sc, LEMAC_REG_TDQ);
+		sc->sc_if.if_opackets++;		/* another one done */
+		if ((txsts & (LEMAC_TDQ_LCL|LEMAC_TDQ_NCL))
+		    || (txsts & LEMAC_TDQ_COL) == LEMAC_TDQ_EXCCOL) {
+			if (txsts & LEMAC_TDQ_NCL)
+				sc->sc_flags &= ~LEMAC_LINKUP;
+			sc->sc_if.if_oerrors++;
+		} else {
+			sc->sc_flags |= LEMAC_LINKUP;
+			if ((txsts & LEMAC_TDQ_COL) != LEMAC_TDQ_NOCOL)
+				sc->sc_if.if_collisions++;
+		}
+	}
+	sc->sc_if.if_flags &= ~IFF_OACTIVE;
+	lemac_ifstart(&sc->sc_if);
+}
+
+void
+lemac_txd_intr(struct lemac_softc *sc, unsigned cs_value)
+{
+	/*
+	 * Read transmit status, remove transmit buffer from
+	 * transmit queue and place on free memory queue,
+	 * then reset transmitter.
+	 * Increment appropriate counters.
+	 */
+
+	sc->sc_cntrs.cntr_txd_intrs++;
+	if (sc->sc_txctl & LEMAC_TX_STP) {
+		sc->sc_if.if_oerrors++;
+		/* return page to free queue */
+		LEMAC_OUTB(sc, LEMAC_REG_FMQ, LEMAC_INB(sc, LEMAC_REG_TDQ));
+	}
+
+	/* Turn back on transmitter if disabled */
+	LEMAC_OUTB(sc, LEMAC_REG_CS, cs_value & ~LEMAC_CS_TXD);
+	sc->sc_if.if_flags &= ~IFF_OACTIVE;
+}
+
+int
+lemac_read_eeprom(struct lemac_softc *sc)
+{
+	int	word_off, cksum;
+
+	u_char *ep;
+
+	cksum = 0;
+	ep = sc->sc_eeprom;
+	for (word_off = 0; word_off < LEMAC_EEP_SIZE / 2; word_off++) {
+		LEMAC_OUTB(sc, LEMAC_REG_PI1, word_off);
+		LEMAC_OUTB(sc, LEMAC_REG_IOP, LEMAC_IOP_EEREAD);
+
+		DELAY(LEMAC_EEP_DELAY);
+
+		*ep = LEMAC_INB(sc, LEMAC_REG_EE1);
+		cksum += *ep++;
+		*ep = LEMAC_INB(sc, LEMAC_REG_EE2);
+		cksum += *ep++;
+	}
+
+	/*
+	 *  Set up Transmit Control Byte for use later during transmit.
+	 */
+
+	sc->sc_txctl |= LEMAC_TX_FLAGS;
+
+	if ((sc->sc_eeprom[LEMAC_EEP_SWFLAGS] & LEMAC_EEP_SW_SQE) == 0)
+		sc->sc_txctl &= ~LEMAC_TX_SQE;
+
+	if (sc->sc_eeprom[LEMAC_EEP_SWFLAGS] & LEMAC_EEP_SW_LAB)
+		sc->sc_txctl |= LEMAC_TX_LAB;
+
+	bcopy(&sc->sc_eeprom[LEMAC_EEP_PRDNM], sc->sc_prodname,
+	    LEMAC_EEP_PRDNMSZ);
+	sc->sc_prodname[LEMAC_EEP_PRDNMSZ] = '\0';
+
+	return (cksum % 256);
+}
+
+void
+lemac_init_adapmem(struct lemac_softc *sc)
+{
+	int pg, conf;
+
+	conf = LEMAC_INB(sc, LEMAC_REG_CNF);
+
+	if ((sc->sc_eeprom[LEMAC_EEP_SETUP] & LEMAC_EEP_ST_DRAM) == 0) {
+		sc->sc_lastpage = 63;
+		conf &= ~LEMAC_CNF_DRAM;
+	} else {
+		sc->sc_lastpage = 127;
+		conf |= LEMAC_CNF_DRAM;
+	}
+
+	LEMAC_OUTB(sc, LEMAC_REG_CNF, conf);
+
+	for (pg = 1; pg <= sc->sc_lastpage; pg++)
+		LEMAC_OUTB(sc, LEMAC_REG_FMQ, pg);
+}
+
+void
+lemac_input(struct lemac_softc *sc, bus_addr_t offset, size_t length)
+{
+	struct ether_header eh;
+	struct mbuf *m;
+
+	if (length - sizeof(eh) > ETHERMTU ||
+	    length - sizeof(eh) < ETHERMIN) {
+		sc->sc_if.if_ierrors++;
+		return;
+	}
+	if (LEMAC_USE_PIO_MODE(sc)) {
+		LEMAC_INSB(sc, LEMAC_REG_DAT, sizeof(eh), (void *)&eh);
+	} else {
+		LEMAC_GETBUF16(sc, offset, sizeof(eh) / 2, (void *)&eh);
+	}
+
+	MGETHDR(m, M_DONTWAIT, MT_DATA);
+	if (m == NULL) {
+		sc->sc_if.if_ierrors++;
+		return;
+	}
+	if (length + 2 > MHLEN) {
+		MCLGET(m, M_DONTWAIT);
+		if ((m->m_flags & M_EXT) == 0) {
+			m_free(m);
+			sc->sc_if.if_ierrors++;
+			return;
+		}
+	}
+	m->m_data += 2;
+	bcopy((caddr_t)&eh, m->m_data, sizeof(eh));
+	if (LEMAC_USE_PIO_MODE(sc)) {
+		LEMAC_INSB(sc, LEMAC_REG_DAT, length - sizeof(eh),
+		    mtod(m, caddr_t) + sizeof(eh));
+	} else {
+		LEMAC_GETBUF16(sc, offset + sizeof(eh),
+		    (length - sizeof(eh)) / 2,
+		    (void *)(mtod(m, caddr_t) + sizeof(eh)));
+		if (length & 1)
+			m->m_data[length - 1] = LEMAC_GET8(sc,
+			    offset + length - 1);
+	}
+#if NBPFILTER > 0
+	if (sc->sc_if.if_bpf != NULL) {
+		m->m_pkthdr.len = m->m_len = length;
+		bpf_mtap(sc->sc_if.if_bpf, m);
+	}
+
+	/*
+	 * If this is single cast but not to us
+	 * drop it!
+	 */
+	if ((eh.ether_dhost[0] & 1) == 0 &&
+	    !LEMAC_ADDREQUAL(eh.ether_dhost, sc->sc_arpcom.ac_enaddr)) {
+		m_freem(m);
+		return;
+	}
+#endif
+	m->m_pkthdr.len = m->m_len = length;
+	m->m_pkthdr.rcvif = &sc->sc_if;
+	ether_input_mbuf(&sc->sc_if, m);
+}
+
+void
+lemac_rne_intr(struct lemac_softc *sc)
+{
+	int rxcount;
+
+	sc->sc_cntrs.cntr_rne_intrs++;
+	rxcount = LEMAC_INB(sc, LEMAC_REG_RQC);
+	while (rxcount--) {
+		unsigned rxpg = LEMAC_INB(sc, LEMAC_REG_RQ);
+		u_int32_t rxlen;
+
+		sc->sc_if.if_ipackets++;
+		if (LEMAC_USE_PIO_MODE(sc)) {
+			LEMAC_OUTB(sc, LEMAC_REG_IOP, rxpg);
+			LEMAC_OUTB(sc, LEMAC_REG_PI1, 0);
+			LEMAC_OUTB(sc, LEMAC_REG_PI2, 0);
+			LEMAC_INSB(sc, LEMAC_REG_DAT, sizeof(rxlen),
+			    (void *)&rxlen);
+		} else {
+			LEMAC_OUTB(sc, LEMAC_REG_MPN, rxpg);
+			rxlen = LEMAC_GET32(sc, 0);
+		}
+		if (rxlen & LEMAC_RX_OK) {
+			sc->sc_flags |= LEMAC_LINKUP;
+			/*
+			 * Get receive length - subtract out checksum.
+			 */
+			rxlen = ((rxlen >> 8) & 0x7FF) - 4;
+			lemac_input(sc, sizeof(rxlen), rxlen);
+		} else {
+			sc->sc_if.if_ierrors++;
+		}
+		/* Return this page to Free Memory Queue */
+		LEMAC_OUTB(sc, LEMAC_REG_FMQ, rxpg);
+	}  /* end while (recv_count--) */
+
+	return;
+}
+
+/*
+ *  This is the standard method of reading the DEC Address ROMS.
+ *  I don't understand it but it does work.
+ */
+int
+lemac_read_macaddr(unsigned char *hwaddr, const bus_space_tag_t iot,
+    const bus_space_handle_t ioh, const bus_addr_t ioreg, int skippat)
+{
+	int cksum, rom_cksum;
+	unsigned char addrbuf[6];
+    
+	if (!skippat) {
+		int idx, idx2, found, octet;
+		static u_char testpat[] = {
+			0xFF, 0, 0x55, 0xAA, 0xFF, 0, 0x55, 0xAA
+		};
+		idx2 = found = 0;
+    
+		for (idx = 0; idx < 32; idx++) {
+			octet = bus_space_read_1(iot, ioh, ioreg);
+	    
+			if (octet == testpat[idx2]) {
+				if (++idx2 == sizeof(testpat)) {
+					++found;
+					break;
+				}
+			} else {
+				idx2 = 0;
+			}
+		}
+
+		if (!found)
+			return (-1);
+	}
+
+	if (hwaddr == NULL)
+		hwaddr = addrbuf;
+
+	cksum = 0;
+	hwaddr[0] = bus_space_read_1(iot, ioh, ioreg);
+	hwaddr[1] = bus_space_read_1(iot, ioh, ioreg);
+
+	/* hardware adddress can't be multicast */
+	if (hwaddr[0] & 1)
+		return (-1);
+
+	cksum = *(u_short *)&hwaddr[0];
+
+	hwaddr[2] = bus_space_read_1(iot, ioh, ioreg);
+	hwaddr[3] = bus_space_read_1(iot, ioh, ioreg);
+	cksum *= 2;
+	if (cksum > 65535)
+		cksum -= 65535;
+	cksum += *(u_short *)&hwaddr[2];
+	if (cksum > 65535)
+		cksum -= 65535;
+
+	hwaddr[4] = bus_space_read_1(iot, ioh, ioreg);
+	hwaddr[5] = bus_space_read_1(iot, ioh, ioreg);
+	cksum *= 2;
+	if (cksum > 65535)
+		cksum -= 65535;
+	cksum += *(u_short *)&hwaddr[4];
+	if (cksum >= 65535)
+		cksum -= 65535;
+
+	/* 00-00-00 is an illegal OUI */
+	if (hwaddr[0] == 0 && hwaddr[1] == 0 && hwaddr[2] == 0)
+		return (-1);
+
+	rom_cksum = bus_space_read_1(iot, ioh, ioreg);
+	rom_cksum |= bus_space_read_1(iot, ioh, ioreg) << 8;
+	
+	if (cksum != rom_cksum)
+		return (-1);
+	return (0);
+}
+
+#if 0
+void
+lemac_multicast_op(u_int16_t *mctbl, const u_char *mca, int enable)
+{
+	u_int idx, bit, crc;
+
+	crc = ether_crc32_le(mca, ETHER_ADDR_LEN);
+
+	/*
+	 * The following two lines convert the N bit index into a
+	 * longword index and a longword mask.
+	 */
+#if LEMAC_MCTBL_BITS < 0
+	crc >>= (32 + LEMAC_MCTBL_BITS);
+	crc &= (1 << -LEMAC_MCTBL_BITS) - 1;
+#else
+	crc &= (1 << LEMAC_MCTBL_BITS) - 1;
+#endif
+	bit = 1 << (crc & 0x0F);
+	idx = crc >> 4;
+
+	/*
+	 * Set or clear hash filter bit in our table.
+	 */
+	if (enable) {
+		mctbl[idx] |= bit;		/* Set Bit */
+	} else {
+		mctbl[idx] &= ~bit;		/* Clear Bit */
+	}
+}
+#endif
+
+void
+lemac_multicast_filter(struct lemac_softc *sc)
+{
+#if 0
+	struct ether_multistep step;
+	struct ether_multi *enm;
+#endif
+
+	bzero(sc->sc_mctbl, LEMAC_MCTBL_BITS / 8);
+
+#if 0
+	lemac_multicast_op(sc->sc_mctbl, etherbroadcastaddr, 1);
+
+	ETHER_FIRST_MULTI(step, &sc->sc_ec, enm);
+	while (enm != NULL) {
+		if (!LEMAC_ADDREQUAL(enm->enm_addrlo, enm->enm_addrhi)) {
+			sc->sc_flags |= LEMAC_ALLMULTI;
+			sc->sc_if.if_flags |= IFF_ALLMULTI;
+			return;
+		}
+		lemac_multicast_op(sc->sc_mctbl, enm->enm_addrlo, TRUE);
+		ETHER_NEXT_MULTI(step, enm);
+	}
+#endif
+	sc->sc_flags &= ~LEMAC_ALLMULTI;
+	sc->sc_if.if_flags &= ~IFF_ALLMULTI;
+}
+
+/* 
+ * Do a hard reset of the board;
+ */
+void
+lemac_reset(struct lemac_softc *const sc)
+{
+	unsigned data;
+
+	/*
+	 * Initialize board..
+	 */
+	sc->sc_flags &= ~LEMAC_LINKUP;
+	sc->sc_if.if_flags &= ~IFF_OACTIVE;
+	LEMAC_INTR_DISABLE(sc);
+
+	LEMAC_OUTB(sc, LEMAC_REG_IOP, LEMAC_IOP_EEINIT);
+	DELAY(LEMAC_EEP_DELAY);
+
+	/*
+	 * Read EEPROM information.  NOTE - the placement of this function
+	 * is important because functions hereafter may rely on information
+	 * read from the EEPROM.
+	 */
+	if ((data = lemac_read_eeprom(sc)) != LEMAC_EEP_CKSUM) { 
+		printf("%s: reset: EEPROM checksum failed (0x%x)\n",
+		    sc->sc_if.if_xname, data);
+		return;
+	}
+
+	/*
+	 * Update the control register to reflect the media choice
+	 */
+	data = LEMAC_INB(sc, LEMAC_REG_CTL);
+	if ((data & (LEMAC_CTL_APD|LEMAC_CTL_PSL)) != sc->sc_ctlmode) {
+		data &= ~(LEMAC_CTL_APD|LEMAC_CTL_PSL);
+		data |= sc->sc_ctlmode;
+		LEMAC_OUTB(sc, LEMAC_REG_CTL, data);
+	}
+
+	/*
+	 *  Force to 2K mode if not already configured.
+	 */
+
+	data = LEMAC_INB(sc, LEMAC_REG_MBR);
+	if (LEMAC_IS_2K_MODE(data)) {
+		sc->sc_flags |= LEMAC_2K_MODE;
+	} else if (LEMAC_IS_64K_MODE(data)) {
+		data = (((data * 2) & 0xF) << 4);
+		sc->sc_flags |= LEMAC_WAS_64K_MODE;
+		LEMAC_OUTB(sc, LEMAC_REG_MBR, data);
+	} else if (LEMAC_IS_32K_MODE(data)) {
+		data = ((data & 0xF) << 4);
+		sc->sc_flags |= LEMAC_WAS_32K_MODE;
+		LEMAC_OUTB(sc, LEMAC_REG_MBR, data);
+	} else {
+		sc->sc_flags |= LEMAC_PIO_MODE;
+		/* PIO mode */
+	}
+
+	/*
+	 *  Initialize Free Memory Queue, Init mcast table with broadcast.
+	 */
+
+	lemac_init_adapmem(sc);
+	sc->sc_flags |= LEMAC_ALIVE;
+}
+
+void
+lemac_init(struct lemac_softc *const sc)
+{
+	if ((sc->sc_flags & LEMAC_ALIVE) == 0)
+		return;
+
+	/*
+	 * If the interface has the up flag
+	 */
+	if (sc->sc_if.if_flags & IFF_UP) {
+		int saved_cs = LEMAC_INB(sc, LEMAC_REG_CS);
+		LEMAC_OUTB(sc, LEMAC_REG_CS,
+		    saved_cs | (LEMAC_CS_TXD | LEMAC_CS_RXD));
+		LEMAC_OUTB(sc, LEMAC_REG_PA0, sc->sc_arpcom.ac_enaddr[0]);
+		LEMAC_OUTB(sc, LEMAC_REG_PA1, sc->sc_arpcom.ac_enaddr[1]);
+		LEMAC_OUTB(sc, LEMAC_REG_PA2, sc->sc_arpcom.ac_enaddr[2]);
+		LEMAC_OUTB(sc, LEMAC_REG_PA3, sc->sc_arpcom.ac_enaddr[3]);
+		LEMAC_OUTB(sc, LEMAC_REG_PA4, sc->sc_arpcom.ac_enaddr[4]);
+		LEMAC_OUTB(sc, LEMAC_REG_PA5, sc->sc_arpcom.ac_enaddr[5]);
+
+		LEMAC_OUTB(sc, LEMAC_REG_IC,
+		    LEMAC_INB(sc, LEMAC_REG_IC) | LEMAC_IC_IE);
+
+		if (sc->sc_if.if_flags & IFF_PROMISC) {
+			LEMAC_OUTB(sc, LEMAC_REG_CS,
+			    LEMAC_CS_MCE | LEMAC_CS_PME);
+		} else {
+			LEMAC_INTR_DISABLE(sc);
+			lemac_multicast_filter(sc);
+			if (sc->sc_flags & LEMAC_ALLMULTI)
+				bcopy(lemac_allmulti_mctbl, sc->sc_mctbl,
+				    sizeof(sc->sc_mctbl));
+			if (LEMAC_USE_PIO_MODE(sc)) {
+				LEMAC_OUTB(sc, LEMAC_REG_IOP, 0);
+				LEMAC_OUTB(sc, LEMAC_REG_PI1,
+				    LEMAC_MCTBL_OFF & 0xFF);
+				LEMAC_OUTB(sc, LEMAC_REG_PI2,
+				    LEMAC_MCTBL_OFF >> 8);
+				LEMAC_OUTSB(sc, LEMAC_REG_DAT,
+				    sizeof(sc->sc_mctbl),
+				    (void *)sc->sc_mctbl);
+			} else {
+				LEMAC_OUTB(sc, LEMAC_REG_MPN, 0);
+				LEMAC_PUTBUF8(sc, LEMAC_MCTBL_OFF,
+				    sizeof(sc->sc_mctbl),
+				    (void *)sc->sc_mctbl);
+			}
+
+			LEMAC_OUTB(sc, LEMAC_REG_CS, LEMAC_CS_MCE);
+		}
+
+		LEMAC_OUTB(sc, LEMAC_REG_CTL,
+		    LEMAC_INB(sc, LEMAC_REG_CTL) ^ LEMAC_CTL_LED);
+
+		LEMAC_INTR_ENABLE(sc);
+		sc->sc_if.if_flags |= IFF_RUNNING;
+		lemac_ifstart(&sc->sc_if);
+	} else {
+		LEMAC_OUTB(sc, LEMAC_REG_CS, LEMAC_CS_RXD|LEMAC_CS_TXD);
+
+		LEMAC_INTR_DISABLE(sc);
+		sc->sc_if.if_flags &= ~IFF_RUNNING;
+	}
+}
+
+void 
+lemac_ifstart(struct ifnet *ifp)
+{
+	struct lemac_softc *const sc = LEMAC_IFP_TO_SOFTC(ifp);
+
+	if ((ifp->if_flags & IFF_RUNNING) == 0)
+		return;
+
+	LEMAC_INTR_DISABLE(sc);
+
+	for (;;) {
+		struct mbuf *m;
+		struct mbuf *m0;
+		int tx_pg;
+
+		IFQ_POLL(&ifp->if_snd, m);
+		if (m == NULL)
+			break;
+
+		if ((sc->sc_csr.csr_tqc = LEMAC_INB(sc, LEMAC_REG_TQC)) >=
+		    lemac_txmax) {
+			sc->sc_cntrs.cntr_txfull++;
+			ifp->if_flags |= IFF_OACTIVE;
+			break;
+		}
+
+		/*
+		 * get free memory page
+		 */
+		tx_pg = sc->sc_csr.csr_fmq = LEMAC_INB(sc, LEMAC_REG_FMQ);
+
+		/*
+		 * Check for good transmit page.
+		 */
+		if (tx_pg == 0 || tx_pg > sc->sc_lastpage) {
+			sc->sc_cntrs.cntr_txnospc++;
+			ifp->if_flags |= IFF_OACTIVE;
+			break;
+		}
+
+		IFQ_DEQUEUE(&ifp->if_snd, m);
+
+		/*
+		 * The first four bytes of each transmit buffer are for
+		 * control information.  The first byte is the control
+		 * byte, then the length (why not word aligned?), then
+		 * the offset to the buffer.
+		 */
+
+		if (LEMAC_USE_PIO_MODE(sc)) {
+			/* Shift 2K window. */
+			LEMAC_OUTB(sc, LEMAC_REG_IOP, tx_pg);
+			LEMAC_OUTB(sc, LEMAC_REG_PI1, 0);
+			LEMAC_OUTB(sc, LEMAC_REG_PI2, 0);
+			LEMAC_OUTB(sc, LEMAC_REG_DAT, sc->sc_txctl);
+			LEMAC_OUTB(sc, LEMAC_REG_DAT,
+			    (m->m_pkthdr.len >> 0) & 0xFF);
+			LEMAC_OUTB(sc, LEMAC_REG_DAT,
+			    (m->m_pkthdr.len >> 8) & 0xFF);
+			LEMAC_OUTB(sc, LEMAC_REG_DAT, LEMAC_TX_HDRSZ);
+			for (m0 = m; m0 != NULL; m0 = m0->m_next)
+				LEMAC_OUTSB(sc, LEMAC_REG_DAT,
+				    m0->m_len, m0->m_data);
+		} else {
+			bus_size_t txoff = /* (mtod(m, u_int32_t) &
+			    (sizeof(u_int32_t) - 1)) + */ LEMAC_TX_HDRSZ;
+			/* Shift 2K window. */
+			LEMAC_OUTB(sc, LEMAC_REG_MPN, tx_pg);
+			LEMAC_PUT8(sc, 0, sc->sc_txctl);
+			LEMAC_PUT8(sc, 1, (m->m_pkthdr.len >> 0) & 0xFF);
+			LEMAC_PUT8(sc, 2, (m->m_pkthdr.len >> 8) & 0xFF);
+			LEMAC_PUT8(sc, 3, txoff);
+
+			/*
+			 * Copy the packet to the board
+			 */
+			for (m0 = m; m0 != NULL; m0 = m0->m_next) {
+#if 0
+				LEMAC_PUTBUF8(sc, txoff, m0->m_len,
+				    m0->m_data);
+				txoff += m0->m_len;
+#else
+				const u_int8_t *cp = m0->m_data;
+				int len = m0->m_len;
+#if 0
+				if ((txoff & 3) == (((long)cp) & 3) &&
+				    len >= 4) {
+					if (txoff & 3) {
+						int alen = (~txoff & 3);
+						LEMAC_PUTBUF8(sc, txoff, alen,
+						    cp);
+						cp += alen;
+						txoff += alen;
+						len -= alen;
+					}
+					if (len >= 4) {
+						LEMAC_PUTBUF32(sc, txoff,
+						    len / 4, cp);
+						cp += len & ~3;
+						txoff += len & ~3;
+						len &= 3;
+					}
+				}
+#endif
+				if ((txoff & 1) == (((long)cp) & 1) &&
+				    len >= 2) {
+					if (txoff & 1) {
+						int alen = (~txoff & 1);
+						LEMAC_PUTBUF8(sc, txoff, alen,
+						    cp);
+						cp += alen;
+						txoff += alen;
+						len -= alen;
+					}
+					if (len >= 2) {
+						LEMAC_PUTBUF16(sc, txoff,
+						    len / 2, (void *)cp);
+						cp += len & ~1;
+						txoff += len & ~1;
+						len &= 1;
+					}
+				}
+				if (len > 0) {
+					LEMAC_PUTBUF8(sc, txoff, len, cp);
+					txoff += len;
+				}
+#endif
+			}
+		}
+
+		/* tell chip to transmit this packet */
+		LEMAC_OUTB(sc, LEMAC_REG_TQ, tx_pg);
+#if NBPFILTER > 0
+		if (sc->sc_if.if_bpf != NULL)
+			bpf_mtap(sc->sc_if.if_bpf, m);
+#endif
+		m_freem(m);			/* free the mbuf */
+	}
+	LEMAC_INTR_ENABLE(sc);
+}
+
+int
+lemac_ifioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
+{
+	struct lemac_softc *const sc = LEMAC_IFP_TO_SOFTC(ifp);
+	int s;
+	int error = 0;
+	struct ifaddr *ifa = (struct ifaddr *)data;
+	struct ifreq *ifr = (struct ifreq *)data;
+
+	s = splnet();
+
+	if ((error = ether_ioctl(ifp, &sc->sc_arpcom, cmd, data)) > 0) {
+		splx(s);
+		return (error);
+	}
+
+	switch (cmd) {
+	case SIOCSIFADDR:
+		ifp->if_flags |= IFF_UP;
+		lemac_init(sc);
+		switch (ifa->ifa_addr->sa_family) {
+#ifdef INET
+		case AF_INET:
+			arp_ifinit(&sc->sc_arpcom, ifa);
+			break;
+#endif /* INET */
+
+#ifdef NS
+		/* This magic copied from if_is.c; I don't use XNS,
+		 * so I have no way of telling if this actually
+		 * works or not.
+		 */
+		case AF_NS: {
+			struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
+			if (ns_nullhost(*ina)) {
+				ina->x_host =
+				    *(union ns_host *)sc->sc_arpcom.ac_enaddr;
+			} else {
+				bcopy((caddr_t)ina->x_host.c_host,
+				    sc->sc_arpcom.ac_enaddr, ifp->if_addrlen);
+			}
+			break;
+		}
+#endif /* NS */
+
+		default:
+			break;
+		}
+		break;
+
+	case SIOCSIFFLAGS:
+		lemac_init(sc);
+		break;
+
+	case SIOCADDMULTI:
+	case SIOCDELMULTI:
+		/*
+		 * Update multicast listeners
+		 */
+		error = (cmd == SIOCADDMULTI) ?
+		    ether_addmulti(ifr, &sc->sc_arpcom) :
+		    ether_delmulti(ifr, &sc->sc_arpcom);
+
+		if (error == ENETRESET) {
+			/* Reset multicast filtering. */
+			lemac_init(sc);
+			error = 0;
+		}
+		break;
+
+	case SIOCSIFMEDIA:
+	case SIOCGIFMEDIA:
+		error = ifmedia_ioctl(ifp, (struct ifreq *)data,
+		    &sc->sc_ifmedia, cmd);
+		break;
+
+	case SIOCSIFMTU:
+		if (ifr->ifr_mtu > ETHERMTU || ifr->ifr_mtu < ETHERMIN) {
+			error = EINVAL;
+		} else if (ifp->if_mtu != ifr->ifr_mtu) {
+			ifp->if_mtu = ifr->ifr_mtu;
+		}
+		break;
+
+	default:
+		error = EINVAL;
+		break;
+	}
+
+	splx(s);
+	return (error);
+}
+
+int
+lemac_ifmedia_change(struct ifnet *const ifp)
+{
+	struct lemac_softc *const sc = LEMAC_IFP_TO_SOFTC(ifp);
+	unsigned new_ctl;
+
+	switch (IFM_SUBTYPE(sc->sc_ifmedia.ifm_media)) {
+	case IFM_10_T:
+		new_ctl = LEMAC_CTL_APD;
+		break;
+	case IFM_10_2:
+	case IFM_10_5:
+		new_ctl = LEMAC_CTL_APD|LEMAC_CTL_PSL;
+		break;
+	case IFM_AUTO:
+		new_ctl = 0;
+		break;
+	default:
+		return (EINVAL);
+	}
+	if (sc->sc_ctlmode != new_ctl) {
+		sc->sc_ctlmode = new_ctl;
+		lemac_reset(sc);
+		if (sc->sc_if.if_flags & IFF_UP)
+			lemac_init(sc);
+	}
+	return (0);
+}
+
+/*
+ * Media status callback
+ */
+void
+lemac_ifmedia_status(struct ifnet *const ifp, struct ifmediareq *req)
+{
+	struct lemac_softc *sc = LEMAC_IFP_TO_SOFTC(ifp);
+	unsigned data = LEMAC_INB(sc, LEMAC_REG_CNF);
+
+	req->ifm_status = IFM_AVALID;
+	if (sc->sc_flags & LEMAC_LINKUP)
+		req->ifm_status |= IFM_ACTIVE;
+
+	if (sc->sc_ctlmode & LEMAC_CTL_APD) {
+		if (sc->sc_ctlmode & LEMAC_CTL_PSL) {
+			req->ifm_active = IFM_10_5;
+		} else {
+			req->ifm_active = IFM_10_T;
+		}
+	} else {
+		/*
+		 * The link bit of the configuration register reflects the
+		 * current media choice when auto-port is enabled.
+		 */
+		if (data & LEMAC_CNF_NOLINK) {
+			req->ifm_active = IFM_10_5;
+		} else {
+			req->ifm_active = IFM_10_T;
+		}
+	}
+
+	req->ifm_active |= IFM_ETHER;
+}
+
+int
+lemac_port_check(const bus_space_tag_t iot, const bus_space_handle_t ioh)
+{
+	unsigned char hwaddr[6];
+
+	if (lemac_read_macaddr(hwaddr, iot, ioh, LEMAC_REG_APD, 0) == 0)
+		return (1);
+	if (lemac_read_macaddr(hwaddr, iot, ioh, LEMAC_REG_APD, 1) == 0)
+		return (1);
+	return (0);
+}
+
+void
+lemac_info_get(const bus_space_tag_t iot, const bus_space_handle_t ioh,
+    bus_addr_t *maddr_p, bus_size_t *msize_p, int *irq_p)
+{
+	unsigned data;
+
+	*irq_p = LEMAC_DECODEIRQ(bus_space_read_1(iot, ioh, LEMAC_REG_IC) &
+	    LEMAC_IC_IRQMSK);
+
+	data = bus_space_read_1(iot, ioh, LEMAC_REG_MBR);
+	if (LEMAC_IS_2K_MODE(data)) {
+		*maddr_p = data * (2 * 1024) + (512 * 1024);
+		*msize_p =  2 * 1024;
+	} else if (LEMAC_IS_64K_MODE(data)) {
+		*maddr_p = data * 64 * 1024;
+		*msize_p = 64 * 1024;
+	} else if (LEMAC_IS_32K_MODE(data)) {
+		*maddr_p = data * 32 * 1024;
+		*msize_p = 32* 1024;
+	} else {
+		*maddr_p = 0;
+		*msize_p = 0;
+	}
+}
+
+/*
+ * What to do upon receipt of an interrupt.
+ */
+int
+lemac_intr(void *arg)
+{
+	struct lemac_softc *const sc = arg;
+	int cs_value;
+
+	LEMAC_INTR_DISABLE(sc);	/* Mask interrupts */
+
+	/*
+	 * Determine cause of interrupt.  Receive events take
+	 * priority over Transmit.
+	 */
+
+	cs_value = LEMAC_INB(sc, LEMAC_REG_CS);
+
+	/*
+	 * Check for Receive Queue not being empty.
+	 * Check for Transmit Done Queue not being empty.
+	 */
+
+	if (cs_value & LEMAC_CS_RNE)
+		lemac_rne_intr(sc);
+	if (cs_value & LEMAC_CS_TNE)
+		lemac_tne_intr(sc);
+
+	/*
+	 * Check for Transmitter Disabled.
+	 * Check for Receiver Disabled.
+	 */
+
+	if (cs_value & LEMAC_CS_TXD)
+		lemac_txd_intr(sc, cs_value);
+	if (cs_value & LEMAC_CS_RXD)
+		lemac_rxd_intr(sc, cs_value);
+
+	/*
+	 * Toggle LED and unmask interrupts.
+	 */
+
+	sc->sc_csr.csr_cs = LEMAC_INB(sc, LEMAC_REG_CS);
+
+	LEMAC_OUTB(sc, LEMAC_REG_CTL,
+	    LEMAC_INB(sc, LEMAC_REG_CTL) ^ LEMAC_CTL_LED);
+	LEMAC_INTR_ENABLE(sc);		/* Unmask interrupts */
+
+#if 0
+	if (cs_value)
+		rnd_add_uint32(&sc->rnd_source, cs_value);
+#endif
+
+	return (1);
+}
+
+void
+lemac_shutdown(void *arg)
+{
+	lemac_reset((struct lemac_softc *)arg);
+}
+
+const char *const lemac_modes[4] = {
+	"PIO mode (internal 2KB window)",
+	"2KB window",
+	"changed 32KB window to 2KB",
+	"changed 64KB window to 2KB",
+};
+
+void
+lemac_ifattach(struct lemac_softc *sc)
+{
+	struct ifnet *const ifp = &sc->sc_if;
+
+	bcopy(sc->sc_dv.dv_xname, ifp->if_xname, IFNAMSIZ);
+
+	lemac_reset(sc);
+
+	lemac_read_macaddr(sc->sc_arpcom.ac_enaddr, sc->sc_iot, sc->sc_ioh,
+	    LEMAC_REG_APD, 0);
+	
+	printf(": %s\n", sc->sc_prodname);
+
+	printf("%s: address %s, %dKB RAM, %s\n", ifp->if_xname,
+	    ether_sprintf(sc->sc_arpcom.ac_enaddr), sc->sc_lastpage * 2 + 2,
+	    lemac_modes[sc->sc_flags & LEMAC_MODE_MASK]);
+
+	ifp->if_softc = (void *)sc;
+	ifp->if_start = lemac_ifstart;
+	ifp->if_ioctl = lemac_ifioctl;
+
+	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX
+#ifdef IFF_NOTRAILERS
+		| IFF_NOTRAILERS
+#endif
+		| IFF_MULTICAST;
+
+	if (sc->sc_flags & LEMAC_ALIVE) {
+		int media;
+
+		IFQ_SET_READY(&ifp->if_snd);
+
+		if_attach(ifp);
+		ether_ifattach(ifp);
+
+#if 0
+		rnd_attach_source(&sc->rnd_source, sc->sc_dv.dv_xname,
+		    RND_TYPE_NET, 0);
+#endif
+
+		ifmedia_init(&sc->sc_ifmedia, 0, lemac_ifmedia_change,
+		    lemac_ifmedia_status);
+		if (sc->sc_prodname[4] == '5')	/* DE205 is UTP/AUI */
+			ifmedia_add(&sc->sc_ifmedia, IFM_ETHER | IFM_AUTO, 0,
+			    0);
+		if (sc->sc_prodname[4] != '3')	/* DE204 & 205 have UTP */
+			ifmedia_add(&sc->sc_ifmedia, IFM_ETHER | IFM_10_T, 0,
+			    0);
+		if (sc->sc_prodname[4] != '4')	/* DE203 & 205 have BNC */
+			ifmedia_add(&sc->sc_ifmedia, IFM_ETHER | IFM_10_5, 0,
+			    0);
+		switch (sc->sc_prodname[4]) {
+		case '3':
+			media = IFM_10_5;
+			break;
+		case '4':
+			media = IFM_10_T;
+			break;
+		default:
+			media = IFM_AUTO;
+			break;
+		}
+		ifmedia_set(&sc->sc_ifmedia, IFM_ETHER | media);
+	} else {
+		printf("%s: disabled due to error\n", ifp->if_xname);
+	}
+}