o new driver for the 3c900, 3c905, 3c905b ported from FreeBSD

o removed if_ep devices in favor of if_xl driver

1 files changed, 3035 insertions, 0 deletions

diff --git a/sys/dev/pci/if_xl.c b/sys/dev/pci/if_xl.c
new file mode 100644
index 00000000000..95ac8c901e6
--- /dev/null
+++ b/sys/dev/pci/if_xl.c
@@ -0,0 +1,3035 @@
+/*	$OpenBSD: if_xl.c,v 1.1 1998/09/02 03:01:05 jason Exp $	*/
+
+/*
+ * Copyright (c) 1997, 1998
+ *	Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Bill Paul.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *	$Id: if_xl.c,v 1.1 1998/09/02 03:01:05 jason Exp $
+ */
+
+/*
+ * 3Com 3c90x Etherlink XL PCI NIC driver
+ *
+ * Supports the 3Com "boomerang" and "cyclone" PCI
+ * bus-master chips (3c90x cards and embedded controllers) including
+ * the following:
+ *
+ * 3Com 3c900-TPO	10Mbps/RJ-45
+ * 3Com 3c900-COMBO	10Mbps/RJ-45,AUI,BNC
+ * 3Com 3c905-TX	10/100Mbps/RJ-45
+ * 3Com 3c905-T4	10/100Mbps/RJ-45
+ * 3Com 3c905B-TX	10/100Mbps/RJ-45
+ * 3Com 3c905B-FL/FX	10/100Mbps/Fiber-optic
+ * Dell Optiplex GX1 on-board 3c905B 10/100Mbps/RJ-45
+ * Dell Precision on-board 3c905B 10/100Mbps/RJ-45
+ * Dell Latitude laptop docking station embedded 3c905-TX
+ *
+ * Written by Bill Paul <wpaul@ctr.columbia.edu>
+ * Electrical Engineering Department
+ * Columbia University, New York City
+ */
+
+/*
+ * The 3c90x series chips use a bus-master DMA interface for transfering
+ * packets to and from the controller chip. Some of the "vortex" cards
+ * (3c59x) also supported a bus master mode, however for those chips
+ * you could only DMA packets to/from a contiguous memory buffer. For
+ * transmission this would mean copying the contents of the queued mbuf
+ * chain into a an mbuf cluster and then DMAing the cluster. This extra
+ * copy would sort of defeat the purpose of the bus master support for
+ * any packet that doesn't fit into a single mbuf.
+ *
+ * By contrast, the 3c90x cards support a fragment-based bus master
+ * mode where mbuf chains can be encapsulated using TX descriptors.
+ * This is similar to other PCI chips such as the Texas Instruments
+ * ThunderLAN and the Intel 82557/82558.
+ *
+ * The "vortex" driver (if_vx.c) happens to work for the "boomerang"
+ * bus master chips because they maintain the old PIO interface for
+ * backwards compatibility, but starting with the 3c905B and the
+ * "cyclone" chips, the compatibility interface has been dropped.
+ * Since using bus master DMA is a big win, we use this driver to
+ * support the PCI "boomerang" chips even though they work with the
+ * "vortex" driver in order to obtain better performance.
+ *
+ * This driver is in the /sys/pci directory because it only supports
+ * PCI-based NICs.
+ */
+
+#include "bpfilter.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 */
+#if defined(__FreeBSD__)
+#include <machine/clock.h>
+#elif defined(__bsdi__) || defined(__NetBSD__) || defined(__OpenBSD__)
+#include <sys/device.h>
+#endif
+
+#if defined(__FreeBSD__)
+
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <net/ethernet.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+
+#elif defined(__OpenBSD__)
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_types.h>
+
+#ifdef INET
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/in_var.h>
+#include <netinet/ip.h>
+#include <netinet/if_ether.h>
+#endif
+
+#include <dev/pci/pcireg.h>
+#include <dev/pci/pcivar.h>
+#include <dev/pci/pcidevs.h>
+
+#endif
+
+#if NBPFILTER > 0
+#include <net/bpf.h>
+#endif
+
+#include <vm/vm.h>              /* for vtophys */
+#include <vm/pmap.h>            /* for vtophys */
+
+#ifdef __FreeBSD__
+#include <pci/pcireg.h>
+#include <pci/pcivar.h>
+#endif
+
+
+/*
+ * The following #define causes the code to use PIO to access the
+ * chip's registers instead of memory mapped mode. The reason PIO mode
+ * is on by default is that the Etherlink XL manual seems to indicate
+ * that only the newer revision chips (3c905B) support both PIO and
+ * memory mapped access. Since we want to be compatible with the older
+ * bus master chips, we use PIO here. If you comment this out, the
+ * driver will use memory mapped I/O, which may be faster but which
+ * might not work on some devices.
+ */
+#define XL_USEIOSPACE
+
+#if defined(__FreeBSD__)
+#include <pci/if_xlreg.h>
+#elif defined(__OpenBSD__)
+#include <dev/pci/if_xlreg.h>
+#endif
+
+#if !defined(lint) && !defined(__OpenBSD__)
+static char rcsid[] =
+	"$Id: if_xl.c,v 1.1 1998/09/02 03:01:05 jason Exp $";
+#endif
+
+#ifdef __FreeBSD__
+/*
+ * Various supported device vendors/types and their names.
+ */
+static struct xl_type xl_devs[] = {
+	{ TC_VENDORID, TC_DEVICEID_BOOMERANG_10BT,
+		"3Com 3c900 Etherlink XL 10BaseT" },
+	{ TC_VENDORID, TC_DEVICEID_BOOMERANG_10BT_COMBO,
+		"3Com 3c900 Etherlink XL 10BaseT Combo" },
+	{ TC_VENDORID, TC_DEVICEID_BOOMERANG_10_100BT,
+		"3Com 3c905 Fast Etherlink XL 10/100BaseTX" },
+	{ TC_VENDORID, TC_DEVICEID_BOOMERANG_100BT4,
+		"3Com 3c905 Fast Etherlink XL 10/100BaseT4" },
+	{ TC_VENDORID, TC_DEVICEID_CYCLONE_10BT,
+		"3Com 3c905B Etherlink XL 10BaseT" },
+	{ TC_VENDORID, TC_DEVICEID_CYCLONE_10BT_COMBO,
+		"3Com 3c905B Etherlink XL 10BaseT Combo" },
+	{ TC_VENDORID, TC_DEVICEID_CYCLONE_10_100BT,
+		"3Com 3c905B Fast Etherlink XL 10/100BaseTX" },
+	{ TC_VENDORID, TC_DEVICEID_CYCLONE_10_100BT4,
+		"3Com 3c905B Fast Etherlink XL 10/100BaseT4" },
+	{ 0, 0, NULL }
+};
+
+/*
+ * Various supported PHY vendors/types and their names. Note that
+ * this driver will work with pretty much any MII-compliant PHY,
+ * so failure to positively identify the chip is not a fatal error.
+ */
+
+static struct xl_type xl_phys[] = {
+	{ TI_PHY_VENDORID, TI_PHY_10BT, "<TI ThunderLAN 10BT (internal)>" },
+	{ TI_PHY_VENDORID, TI_PHY_100VGPMI, "<TI TNETE211 100VG Any-LAN>" },
+	{ NS_PHY_VENDORID, NS_PHY_83840A, "<National Semiconductor DP83840A>"},
+	{ LEVEL1_PHY_VENDORID, LEVEL1_PHY_LXT970, "<Level 1 LXT970>" }, 
+	{ INTEL_PHY_VENDORID, INTEL_PHY_82555, "<Intel 82555>" },
+	{ SEEQ_PHY_VENDORID, SEEQ_PHY_80220, "<SEEQ 80220>" },
+	{ 0, 0, "<MII-compliant physical interface>" }
+};
+#endif
+
+#if defined(__FreeBSD__)
+static unsigned long xl_count = 0;
+static char *xl_probe		__P((pcici_t, pcidi_t));
+static void xl_attach		__P((pcici_t, int));
+static int xl_ifmedia_upd	__P((struct ifnet *));
+static void xl_ifmedia_sts	__P((struct ifnet *, struct ifmediareq *));
+static void xl_setmode_mii	__P((struct xl_softc *, int));
+static void xl_getmode_mii	__P((struct xl_softc *));
+static void xl_setmode		__P((struct xl_softc *, int));
+static void xl_intr		__P((void *));
+static void xl_shutdown		__P((int, void *));
+#elif defined(__OpenBSD__)
+static int xl_probe	__P((struct device *, void *, void *));
+static void xl_attach	__P((struct device *, struct device *, void *));
+static int xl_intr		__P((void *));
+static void xl_shutdown		__P((void *));
+#endif
+
+static int xl_newbuf		__P((struct xl_softc *,
+						struct xl_chain_onefrag *));
+static void xl_stats_update	__P((void *));
+static int xl_encap		__P((struct xl_softc *, struct xl_chain *,
+						struct mbuf * ));
+
+static void xl_rxeof		__P((struct xl_softc *));
+static void xl_txeof		__P((struct xl_softc *));
+static void xl_txeoc		__P((struct xl_softc *));
+static void xl_start		__P((struct ifnet *));
+static int xl_ioctl		__P((struct ifnet *, u_long, caddr_t));
+static void xl_init		__P((void *));
+static void xl_stop		__P((struct xl_softc *));
+static void xl_watchdog		__P((struct ifnet *));
+static u_int8_t xl_calchash	__P((u_int8_t *));
+static void xl_mediacheck	__P((struct xl_softc *));
+static void xl_autoneg_mii	__P((struct xl_softc *, int, int));
+static void xl_autoneg_xmit	__P((struct xl_softc *));
+
+static int xl_eeprom_wait	__P((struct xl_softc *));
+static int xl_read_eeprom	__P((struct xl_softc *, caddr_t, int,
+							int, int));
+static void xl_mii_sync		__P((struct xl_softc *));
+static void xl_mii_send		__P((struct xl_softc *, u_int32_t, int));
+static int xl_mii_readreg	__P((struct xl_softc *, struct xl_mii_frame *));
+static int xl_mii_writereg	__P((struct xl_softc *, struct xl_mii_frame *));
+static u_int16_t xl_phy_readreg	__P((struct xl_softc *, int));
+static void xl_phy_writereg	__P((struct xl_softc *, u_int16_t, u_int16_t));
+
+static void xl_setmulti		__P((struct xl_softc *));
+static void xl_setmulti_hash	__P((struct xl_softc *));
+static void xl_reset		__P((struct xl_softc *));
+static int xl_list_rx_init	__P((struct xl_softc *));
+static int xl_list_tx_init	__P((struct xl_softc *));
+static void xl_wait		__P((struct xl_softc *));
+#ifdef notdef
+static void xl_testpacket	__P((struct xl_softc *));
+#endif
+
+/*
+ * Murphy's law says that it's possible the chip can wedge and
+ * the 'command in progress' bit may never clear. Hence, we wait
+ * only a finite amount of time to avoid getting caught in an
+ * infinite loop. Normally this delay routine would be a macro,
+ * but it isn't called during normal operation so we can afford
+ * to make it a function.
+ */
+static void xl_wait(sc)
+	struct xl_softc		*sc;
+{
+	register int		i;
+
+	for (i = 0; i < XL_TIMEOUT; i++) {
+		DELAY(10);
+		if (!(CSR_READ_2(sc, XL_STATUS) & XL_STAT_CMDBUSY))
+			break;
+	}
+	if (i == XL_TIMEOUT)
+		printf("xl%d: command never completed!\n", sc->xl_unit);
+
+	return;
+}
+
+/*
+ * MII access routines are provided for adapters with external
+ * PHYs (3c905-TX, 3c905-T4, 3c905B-T4) and those with built-in
+ * autoneg logic that's faked up to look like a PHY (3c905B-TX).
+ * Note: if you don't perform the MDIO operations just right,
+ * it's possible to end up with code that works correctly with
+ * some chips/CPUs/processor speeds/bus speeds/etc but not
+ * with others.
+ */
+#define MII_SET(x)					\
+	CSR_WRITE_2(sc, XL_W4_PHY_MGMT,			\
+		CSR_READ_2(sc, XL_W4_PHY_MGMT) | x)
+
+#define MII_CLR(x)					\
+	CSR_WRITE_2(sc, XL_W4_PHY_MGMT,			\
+		CSR_READ_2(sc, XL_W4_PHY_MGMT) & ~x)
+
+/*
+ * Sync the PHYs by setting data bit and strobing the clock 32 times.
+ */
+static void xl_mii_sync(sc)
+	struct xl_softc		*sc;
+{
+	register int		i;
+
+	XL_SEL_WIN(4);
+	MII_SET(XL_MII_DIR|XL_MII_DATA);
+
+	for (i = 0; i < 32; i++) {
+		MII_SET(XL_MII_CLK);
+		DELAY(1);
+		MII_CLR(XL_MII_CLK);
+		DELAY(1);
+	}
+
+	return;
+}
+
+/*
+ * Clock a series of bits through the MII.
+ */
+static void xl_mii_send(sc, bits, cnt)
+	struct xl_softc		*sc;
+	u_int32_t		bits;
+	int			cnt;
+{
+	int			i;
+
+	XL_SEL_WIN(4);
+	MII_CLR(XL_MII_CLK);
+
+	for (i = (0x1 << (cnt - 1)); i; i >>= 1) {
+                if (bits & i) {
+			MII_SET(XL_MII_DATA);
+                } else {
+			MII_CLR(XL_MII_DATA);
+                }
+		DELAY(1);
+		MII_CLR(XL_MII_CLK);
+		DELAY(1);
+		MII_SET(XL_MII_CLK);
+	}
+}
+
+/*
+ * Read an PHY register through the MII.
+ */
+static int xl_mii_readreg(sc, frame)
+	struct xl_softc		*sc;
+	struct xl_mii_frame	*frame;
+	
+{
+	int			i, ack, s;
+
+	s = splimp();
+
+	/*
+	 * Set up frame for RX.
+	 */
+	frame->mii_stdelim = XL_MII_STARTDELIM;
+	frame->mii_opcode = XL_MII_READOP;
+	frame->mii_turnaround = 0;
+	frame->mii_data = 0;
+	
+	/*
+	 * Select register window 4.
+	 */
+
+	XL_SEL_WIN(4);
+
+	CSR_WRITE_2(sc, XL_W4_PHY_MGMT, 0);
+	/*
+ 	 * Turn on data xmit.
+	 */
+	MII_SET(XL_MII_DIR);
+
+	xl_mii_sync(sc);
+
+	/*
+	 * Send command/address info.
+	 */
+	xl_mii_send(sc, frame->mii_stdelim, 2);
+	xl_mii_send(sc, frame->mii_opcode, 2);
+	xl_mii_send(sc, frame->mii_phyaddr, 5);
+	xl_mii_send(sc, frame->mii_regaddr, 5);
+
+	/* Idle bit */
+	MII_CLR((XL_MII_CLK|XL_MII_DATA));
+	DELAY(1);
+	MII_SET(XL_MII_CLK);
+	DELAY(1);
+
+	/* Turn off xmit. */
+	MII_CLR(XL_MII_DIR);
+
+	/* Check for ack */
+	MII_CLR(XL_MII_CLK);
+	DELAY(1);
+	MII_SET(XL_MII_CLK);
+	DELAY(1);
+	ack = CSR_READ_2(sc, XL_W4_PHY_MGMT) & XL_MII_DATA;
+
+	/*
+	 * Now try reading data bits. If the ack failed, we still
+	 * need to clock through 16 cycles to keep the PHY(s) in sync.
+	 */
+	if (ack) {
+		for(i = 0; i < 16; i++) {
+			MII_CLR(XL_MII_CLK);
+			DELAY(1);
+			MII_SET(XL_MII_CLK);
+			DELAY(1);
+		}
+		goto fail;
+	}
+
+	for (i = 0x8000; i; i >>= 1) {
+		MII_CLR(XL_MII_CLK);
+		DELAY(1);
+		if (!ack) {
+			if (CSR_READ_2(sc, XL_W4_PHY_MGMT) & XL_MII_DATA)
+				frame->mii_data |= i;
+			DELAY(1);
+		}
+		MII_SET(XL_MII_CLK);
+		DELAY(1);
+	}
+
+fail:
+
+	MII_CLR(XL_MII_CLK);
+	DELAY(1);
+	MII_SET(XL_MII_CLK);
+	DELAY(1);
+
+	splx(s);
+
+	if (ack)
+		return(1);
+	return(0);
+}
+
+/*
+ * Write to a PHY register through the MII.
+ */
+static int xl_mii_writereg(sc, frame)
+	struct xl_softc		*sc;
+	struct xl_mii_frame	*frame;
+	
+{
+	int			s;
+
+
+
+	s = splimp();
+	/*
+	 * Set up frame for TX.
+	 */
+
+	frame->mii_stdelim = XL_MII_STARTDELIM;
+	frame->mii_opcode = XL_MII_WRITEOP;
+	frame->mii_turnaround = XL_MII_TURNAROUND;
+	
+	/*
+	 * Select the window 4.
+	 */
+	XL_SEL_WIN(4);
+
+	/*
+ 	 * Turn on data output.
+	 */
+	MII_SET(XL_MII_DIR);
+
+	xl_mii_sync(sc);
+
+	xl_mii_send(sc, frame->mii_stdelim, 2);
+	xl_mii_send(sc, frame->mii_opcode, 2);
+	xl_mii_send(sc, frame->mii_phyaddr, 5);
+	xl_mii_send(sc, frame->mii_regaddr, 5);
+	xl_mii_send(sc, frame->mii_turnaround, 2);
+	xl_mii_send(sc, frame->mii_data, 16);
+
+	/* Idle bit. */
+	MII_SET(XL_MII_CLK);
+	DELAY(1);
+	MII_CLR(XL_MII_CLK);
+	DELAY(1);
+
+	/*
+	 * Turn off xmit.
+	 */
+	MII_CLR(XL_MII_DIR);
+
+	splx(s);
+
+	return(0);
+}
+
+static u_int16_t xl_phy_readreg(sc, reg)
+	struct xl_softc		*sc;
+	int			reg;
+{
+	struct xl_mii_frame	frame;
+
+	bzero((char *)&frame, sizeof(frame));
+
+	frame.mii_phyaddr = sc->xl_phy_addr;
+	frame.mii_regaddr = reg;
+	xl_mii_readreg(sc, &frame);
+
+	return(frame.mii_data);
+}
+
+static void xl_phy_writereg(sc, reg, data)
+	struct xl_softc		*sc;
+	u_int16_t		reg;
+	u_int16_t		data;
+{
+	struct xl_mii_frame	frame;
+
+	bzero((char *)&frame, sizeof(frame));
+
+	frame.mii_phyaddr = sc->xl_phy_addr;
+	frame.mii_regaddr = reg;
+	frame.mii_data = data;
+
+	xl_mii_writereg(sc, &frame);
+
+	return;
+}
+
+/*
+ * The EEPROM is slow: give it time to come ready after issuing
+ * it a command.
+ */
+static int xl_eeprom_wait(sc)
+	struct xl_softc		*sc;
+{
+	int			i;
+
+	for (i = 0; i < 100; i++) {
+		if (CSR_READ_2(sc, XL_W0_EE_CMD) & XL_EE_BUSY)
+			DELAY(162);
+		else
+			break;
+	}
+
+	if (i == 100) {
+		printf("xl%d: eeprom failed to come ready\n", sc->xl_unit);
+		return(1);
+	}
+
+	return(0);
+}
+
+/*
+ * Read a sequence of words from the EEPROM. Note that ethernet address
+ * data is stored in the EEPROM in network byte order.
+ */
+static int xl_read_eeprom(sc, dest, off, cnt, swap)
+	struct xl_softc		*sc;
+	caddr_t			dest;
+	int			off;
+	int			cnt;
+	int			swap;
+{
+	int			err = 0, i;
+	u_int16_t		word = 0, *ptr;
+
+	XL_SEL_WIN(0);
+
+	if (xl_eeprom_wait(sc))
+		return(1);
+
+	for (i = 0; i < cnt; i++) {
+		CSR_WRITE_2(sc, XL_W0_EE_CMD, XL_EE_READ | (off + i));
+		err = xl_eeprom_wait(sc);
+		if (err)
+			break;
+		word = CSR_READ_2(sc, XL_W0_EE_DATA);
+		ptr = (u_int16_t *)(dest + (i * 2));
+		if (swap)
+			*ptr = ntohs(word);
+		else
+			*ptr = word;	
+	}
+
+	return(err ? 1 : 0);
+}
+
+/*
+ * This routine is taken from the 3Com Etherlink XL manual,
+ * page 10-7. It calculates a CRC of the supplied multicast
+ * group address and returns the lower 8 bits, which are used
+ * as the multicast filter position.
+ * Note: the 3c905B currently only supports a 64-bit hash table,
+ * which means we really only need 6 bits, but the manual indicates
+ * that future chip revisions will have a 256-bit hash table,
+ * hence the routine is set up to calculate 8 bits of position
+ * info in case we need it some day.
+ * Note II, The Sequel: _CURRENT_ versions of the 3c905B have a
+ * 256 bit hash table. This means we have to use all 8 bits regardless.
+ * On older cards, the upper 2 bits will be ignored. Grrrr....
+ */
+static u_int8_t xl_calchash(addr)
+	u_int8_t		*addr;
+{
+	u_int32_t		crc, carry;
+	int			i, j;
+	u_int8_t		c;
+
+	/* Compute CRC for the address value. */
+	crc = 0xFFFFFFFF; /* initial value */
+
+	for (i = 0; i < 6; i++) {
+		c = *(addr + i);
+		for (j = 0; j < 8; j++) {
+			carry = ((crc & 0x80000000) ? 1 : 0) ^ (c & 0x01);
+			crc <<= 1;
+			c >>= 1;
+			if (carry)
+				crc = (crc ^ 0x04c11db6) | carry;
+		}
+	}
+
+	/* return the filter bit position */
+	return(crc & 0x000000FF);
+}
+
+/*
+ * NICs older than the 3c905B have only one multicast option, which
+ * is to enable reception of all multicast frames.
+ */
+static void xl_setmulti(sc)
+	struct xl_softc		*sc;
+{
+	struct ifnet		*ifp;
+#ifdef __FreeBSD__
+	struct ifmultiaddr	*ifma;
+#else
+	struct arpcom *ac = &sc->arpcom;
+	struct ether_multi *enm;
+	struct ether_multistep step;
+#endif
+	u_int8_t		rxfilt;
+	int			mcnt = 0;
+
+	ifp = &sc->arpcom.ac_if;
+
+	XL_SEL_WIN(5);
+	rxfilt = CSR_READ_1(sc, XL_W5_RX_FILTER);
+
+	if (ifp->if_flags & IFF_ALLMULTI) {
+		rxfilt |= XL_RXFILTER_ALLMULTI;
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_SET_FILT|rxfilt);
+		return;
+	}
+
+#ifdef __FreeBSD__
+	for (ifma = ifp->if_multiaddrs.lh_first; ifma != NULL;
+				ifma = ifma->ifma_link.le_next)
+		mcnt++;
+#else
+	ETHER_FIRST_MULTI(step, ac, enm);
+	while (enm != NULL) {
+		mcnt++;
+		ETHER_NEXT_MULTI(step, enm);
+	}
+#endif
+
+	if (mcnt)
+		rxfilt |= XL_RXFILTER_ALLMULTI;
+	else
+		rxfilt &= ~XL_RXFILTER_ALLMULTI;
+
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_SET_FILT|rxfilt);
+
+	return;
+}
+
+/*
+ * 3c905B adapters have a hash filter that we can program.
+ */
+static void xl_setmulti_hash(sc)
+	struct xl_softc		*sc;
+{
+	struct ifnet		*ifp;
+	int			h = 0, i;
+#ifdef __FreeBSD__
+	struct ifmultiaddr	*ifma;
+#else
+	struct arpcom *ac = &sc->arpcom;
+	struct ether_multi *enm;
+	struct ether_multistep step;
+#endif
+	u_int8_t		rxfilt;
+	int			mcnt = 0;
+
+	ifp = &sc->arpcom.ac_if;
+
+	XL_SEL_WIN(5);
+	rxfilt = CSR_READ_1(sc, XL_W5_RX_FILTER);
+
+	if (ifp->if_flags & IFF_ALLMULTI) {
+		rxfilt |= XL_RXFILTER_ALLMULTI;
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_SET_FILT|rxfilt);
+		return;
+	} else
+		rxfilt &= ~XL_RXFILTER_ALLMULTI;
+
+
+	/* first, zot all the existing hash bits */
+	for (i = 0; i < XL_HASHFILT_SIZE; i++)
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_SET_HASH|i);
+
+	/* now program new ones */
+#ifdef __FreeBSD__
+	for (ifma = ifp->if_multiaddrs.lh_first; ifma != NULL;
+				ifma = ifma->ifma_link.le_next) {
+		if (ifma->ifma_addr->sa_family != AF_LINK)
+			continue;
+		h = xl_calchash(LLADDR((struct sockaddr_dl *)ifma->ifma_addr));
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_SET_HASH|XL_HASH_SET|h);
+		mcnt++;
+	}
+#else
+	ETHER_FIRST_MULTI(step, ac, enm);
+	while (enm != NULL) {
+		h = xl_calchash(enm->enm_addrlo);
+		mcnt++;
+		ETHER_NEXT_MULTI(step, enm);
+	}
+#endif
+
+	if (mcnt)
+		rxfilt |= XL_RXFILTER_MULTIHASH;
+	else
+		rxfilt &= ~XL_RXFILTER_MULTIHASH;
+
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_SET_FILT|rxfilt);
+
+	return;
+}
+
+#ifdef notdef
+static void xl_testpacket(sc)
+	struct xl_softc		*sc;
+{
+	struct mbuf		*m;
+	struct ifnet		*ifp;
+
+	ifp = &sc->arpcom.ac_if;
+
+	MGETHDR(m, M_DONTWAIT, MT_DATA);
+
+	if (m == NULL)
+		return;
+
+	bcopy(&sc->arpcom.ac_enaddr,
+		mtod(m, struct ether_header *)->ether_dhost, ETHER_ADDR_LEN);
+	bcopy(&sc->arpcom.ac_enaddr,
+		mtod(m, struct ether_header *)->ether_shost, ETHER_ADDR_LEN);
+	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;
+	m->m_len = m->m_pkthdr.len = sizeof(struct ether_header) + 3;
+	IF_ENQUEUE(&ifp->if_snd, m);
+	xl_start(ifp);
+
+	return;
+}
+#endif
+
+/*
+ * Initiate an autonegotiation session.
+ */
+static void xl_autoneg_xmit(sc)
+	struct xl_softc		*sc;
+{
+	u_int16_t		phy_sts;
+
+	xl_phy_writereg(sc, PHY_BMCR, PHY_BMCR_RESET);
+	DELAY(500);
+	while(xl_phy_readreg(sc, XL_PHY_GENCTL)
+			& PHY_BMCR_RESET);
+
+	phy_sts = xl_phy_readreg(sc, PHY_BMCR);
+	phy_sts |= PHY_BMCR_AUTONEGENBL|PHY_BMCR_AUTONEGRSTR;
+	xl_phy_writereg(sc, PHY_BMCR, phy_sts);
+
+	return;
+}
+
+/*
+ * Invoke autonegotiation on a PHY. Also used with the 3Com internal
+ * autoneg logic which is mapped onto the MII.
+ */
+static void xl_autoneg_mii(sc, flag, verbose)
+	struct xl_softc		*sc;
+	int			flag;
+	int			verbose;
+{
+	u_int16_t		phy_sts = 0, media, advert, ability;
+	struct ifnet		*ifp;
+#ifndef __OpenBSD__
+	struct ifmedia		*ifm;
+
+	ifm = &sc->ifmedia;
+#endif
+	ifp = &sc->arpcom.ac_if;
+
+	/*
+	 * The 100baseT4 PHY on the 3c905-T4 has the 'autoneg supported'
+	 * bit cleared in the status register, but has the 'autoneg enabled'
+	 * bit set in the control register. This is a contradiction, and
+	 * I'm not sure how to handle it. If you want to force an attempt
+	 * to autoneg for 100baseT4 PHYs, #define FORCE_AUTONEG_TFOUR
+	 * and see what happens.
+	 */
+#ifndef FORCE_AUTONEG_TFOUR
+	/*
+	 * First, see if autoneg is supported. If not, there's
+	 * no point in continuing.
+	 */
+	phy_sts = xl_phy_readreg(sc, PHY_BMSR);
+	if (!(phy_sts & PHY_BMSR_CANAUTONEG)) {
+		if (verbose)
+			printf("xl%d: autonegotiation not supported\n",
+							sc->xl_unit);
+		return;
+	}
+#endif
+
+	switch (flag) {
+	case XL_FLAG_FORCEDELAY:
+		/*
+	 	 * XXX Never use this option anywhere but in the probe
+	 	 * routine: making the kernel stop dead in its tracks
+ 		 * for three whole seconds after we've gone multi-user
+		 * is really bad manners.
+	 	 */
+		xl_autoneg_xmit(sc);
+		DELAY(3000000);
+		break;
+	case XL_FLAG_SCHEDDELAY:
+		/*
+		 * Wait for the transmitter to go idle before starting
+		 * an autoneg session, otherwise xl_start() may clobber
+	 	 * our timeout, and we don't want to allow transmission
+		 * during an autoneg session since that can screw it up.
+	 	 */
+		if (sc->xl_cdata.xl_tx_head != NULL) {
+			sc->xl_want_auto = 1;
+			return;
+		}
+		xl_autoneg_xmit(sc);
+		ifp->if_timer = 5;
+		sc->xl_autoneg = 1;
+		sc->xl_want_auto = 0;
+		return;
+		break;
+	case XL_FLAG_DELAYTIMEO:
+		ifp->if_timer = 0;
+		sc->xl_autoneg = 0;
+		break;
+	default:
+		printf("xl%d: invalid autoneg flag: %d\n", sc->xl_unit, flag);
+		return;
+	}
+
+	if (xl_phy_readreg(sc, PHY_BMSR) & PHY_BMSR_AUTONEGCOMP) {
+		if (verbose)
+			printf("xl%d: autoneg complete, ", sc->xl_unit);
+		phy_sts = xl_phy_readreg(sc, PHY_BMSR);
+	} else {
+		if (verbose)
+			printf("xl%d: autoneg not complete, ", sc->xl_unit);
+	}
+
+	media = xl_phy_readreg(sc, PHY_BMCR);
+
+	/* Link is good. Report modes and set duplex mode. */
+	if (xl_phy_readreg(sc, PHY_BMSR) & PHY_BMSR_LINKSTAT) {
+		if (verbose)
+			printf("link status good ");
+		advert = xl_phy_readreg(sc, XL_PHY_ANAR);
+		ability = xl_phy_readreg(sc, XL_PHY_LPAR);
+
+		if (advert & PHY_ANAR_100BT4 && ability & PHY_ANAR_100BT4) {
+#ifndef __OpenBSD__
+			ifm->ifm_media = IFM_ETHER|IFM_100_T4;
+#endif
+			media |= PHY_BMCR_SPEEDSEL;
+			media &= ~PHY_BMCR_DUPLEX;
+			printf("(100baseT4)\n");
+		} else if (advert & PHY_ANAR_100BTXFULL &&
+			ability & PHY_ANAR_100BTXFULL) {
+#ifndef __OpenBSD__
+			ifm->ifm_media = IFM_ETHER|IFM_100_TX|IFM_FDX;
+#endif
+			media |= PHY_BMCR_SPEEDSEL;
+			media |= PHY_BMCR_DUPLEX;
+			printf("(full-duplex, 100Mbps)\n");
+		} else if (advert & PHY_ANAR_100BTXHALF &&
+			ability & PHY_ANAR_100BTXHALF) {
+#ifndef __OpenBSD__
+			ifm->ifm_media = IFM_ETHER|IFM_100_TX|IFM_HDX;
+#endif
+			media |= PHY_BMCR_SPEEDSEL;
+			media &= ~PHY_BMCR_DUPLEX;
+			printf("(half-duplex, 100Mbps)\n");
+		} else if (advert & PHY_ANAR_10BTFULL &&
+			ability & PHY_ANAR_10BTFULL) {
+#ifndef __OpenBSD__
+			ifm->ifm_media = IFM_ETHER|IFM_10_T|IFM_FDX;
+#endif
+			media &= ~PHY_BMCR_SPEEDSEL;
+			media |= PHY_BMCR_DUPLEX;
+			printf("(full-duplex, 10Mbps)\n");
+		} else if (advert & PHY_ANAR_10BTHALF &&
+			ability & PHY_ANAR_10BTHALF) {
+#ifndef __OpenBSD__
+			ifm->ifm_media = IFM_ETHER|IFM_10_T|IFM_HDX;
+#endif
+			media &= ~PHY_BMCR_SPEEDSEL;
+			media &= ~PHY_BMCR_DUPLEX;
+			printf("(half-duplex, 10Mbps)\n");
+		}
+
+		/* Set ASIC's duplex mode to match the PHY. */
+		XL_SEL_WIN(3);
+		if (media & PHY_BMCR_DUPLEX)
+			CSR_WRITE_1(sc, XL_W3_MAC_CTRL, XL_MACCTRL_DUPLEX);
+		else
+			CSR_WRITE_1(sc, XL_W3_MAC_CTRL,
+				(CSR_READ_1(sc, XL_W3_MAC_CTRL) &
+						~XL_MACCTRL_DUPLEX));
+		xl_phy_writereg(sc, PHY_BMCR, media);
+	} else {
+		if (verbose)
+			printf("no carrier\n");
+	}
+
+	xl_init(sc);
+
+	if (sc->xl_tx_pend) {
+		sc->xl_autoneg = 0;
+		sc->xl_tx_pend = 0;
+		xl_start(ifp);
+	}
+
+	return;
+}
+
+#ifdef __FreeBSD__
+static void xl_getmode_mii(sc)
+	struct xl_softc		*sc;
+{
+	u_int16_t		bmsr;
+	struct ifnet		*ifp;
+
+	ifp = &sc->arpcom.ac_if;
+
+	bmsr = xl_phy_readreg(sc, PHY_BMSR);
+	if (bootverbose)
+		printf("xl%d: PHY status word: %x\n", sc->xl_unit, bmsr);
+
+	/* fallback */
+	sc->ifmedia.ifm_media = IFM_ETHER|IFM_10_T|IFM_HDX;
+
+	if (bmsr & PHY_BMSR_10BTHALF) {
+		if (bootverbose)
+			printf("xl%d: 10Mbps half-duplex mode supported\n",
+								sc->xl_unit);
+		ifmedia_add(&sc->ifmedia,
+			IFM_ETHER|IFM_10_T|IFM_HDX, 0, NULL);
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_10_T, 0, NULL);
+	}
+
+	if (bmsr & PHY_BMSR_10BTFULL) {
+		if (bootverbose)
+			printf("xl%d: 10Mbps full-duplex mode supported\n",
+								sc->xl_unit);
+		ifmedia_add(&sc->ifmedia,
+			IFM_ETHER|IFM_10_T|IFM_FDX, 0, NULL);
+		sc->ifmedia.ifm_media = IFM_ETHER|IFM_10_T|IFM_FDX;
+	}
+
+	if (bmsr & PHY_BMSR_100BTXHALF) {
+		if (bootverbose)
+			printf("xl%d: 100Mbps half-duplex mode supported\n",
+								sc->xl_unit);
+		ifp->if_baudrate = 100000000;
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_100_TX, 0, NULL);
+		ifmedia_add(&sc->ifmedia,
+			IFM_ETHER|IFM_100_TX|IFM_HDX, 0, NULL);
+		sc->ifmedia.ifm_media = IFM_ETHER|IFM_100_TX|IFM_HDX;
+	}
+
+	if (bmsr & PHY_BMSR_100BTXFULL) {
+		if (bootverbose)
+			printf("xl%d: 100Mbps full-duplex mode supported\n",
+								sc->xl_unit);
+		ifp->if_baudrate = 100000000;
+		ifmedia_add(&sc->ifmedia,
+			IFM_ETHER|IFM_100_TX|IFM_FDX, 0, NULL);
+		sc->ifmedia.ifm_media = IFM_ETHER|IFM_100_TX|IFM_FDX;
+	}
+
+	/* Some also support 100BaseT4. */
+	if (bmsr & PHY_BMSR_100BT4) {
+		if (bootverbose)
+			printf("xl%d: 100baseT4 mode supported\n", sc->xl_unit);
+		ifp->if_baudrate = 100000000;
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_100_T4, 0, NULL);
+		sc->ifmedia.ifm_media = IFM_ETHER|IFM_100_T4;
+#ifdef FORCE_AUTONEG_TFOUR
+		if (bootverbose)
+			printf("xl%d: forcing on autoneg support for BT4\n",
+							 sc->xl_unit);
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_AUTO, 0 NULL):
+		sc->ifmedia.ifm_media = IFM_ETHER|IFM_AUTO;
+#endif
+	}
+
+	if (bmsr & PHY_BMSR_CANAUTONEG) {
+		if (bootverbose)
+			printf("xl%d: autoneg supported\n", sc->xl_unit);
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_AUTO, 0, NULL);
+		sc->ifmedia.ifm_media = IFM_ETHER|IFM_AUTO;
+	}
+
+	return;
+}
+
+/*
+ * Set speed and duplex mode.
+ */
+static void xl_setmode_mii(sc, media)
+	struct xl_softc		*sc;
+	int			media;
+{
+	u_int16_t		bmcr;
+	u_int32_t		icfg;
+
+	printf("xl%d: selecting MII, ", sc->xl_unit);
+
+	XL_SEL_WIN(3);
+	icfg = CSR_READ_4(sc, XL_W3_INTERNAL_CFG);
+	icfg &= ~XL_ICFG_CONNECTOR_MASK;
+	if (sc->xl_media & XL_MEDIAOPT_MII || sc->xl_media & XL_MEDIAOPT_BT4)
+		icfg |= (XL_XCVR_MII << XL_ICFG_CONNECTOR_BITS);
+	if (sc->xl_media & XL_MEDIAOPT_BTX) {
+		if (sc->xl_type == XL_TYPE_905B)
+			icfg |= (XL_XCVR_AUTO << XL_ICFG_CONNECTOR_BITS);
+		else
+			icfg |= (XL_XCVR_MII << XL_ICFG_CONNECTOR_BITS);
+	}
+	CSR_WRITE_4(sc, XL_W3_INTERNAL_CFG, icfg);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_COAX_STOP);
+
+	if (IFM_SUBTYPE(media) == IFM_100_FX) {
+		icfg |= (XL_XCVR_100BFX << XL_ICFG_CONNECTOR_BITS);
+		CSR_WRITE_4(sc, XL_W3_INTERNAL_CFG, icfg);
+		return;
+	}
+
+	bmcr = xl_phy_readreg(sc, PHY_BMCR);
+
+	bmcr &= ~(PHY_BMCR_AUTONEGENBL|PHY_BMCR_SPEEDSEL|
+			PHY_BMCR_DUPLEX|PHY_BMCR_LOOPBK);
+
+	if (IFM_SUBTYPE(media) == IFM_100_T4) {
+		printf("100Mbps/T4, half-duplex\n");
+		bmcr |= PHY_BMCR_SPEEDSEL;
+		bmcr &= ~PHY_BMCR_DUPLEX;
+	}
+
+	if (IFM_SUBTYPE(media) == IFM_100_TX) {
+		printf("100Mbps, ");
+		bmcr |= PHY_BMCR_SPEEDSEL;
+	}
+
+	if (IFM_SUBTYPE(media) == IFM_10_T) {
+		printf("10Mbps, ");
+		bmcr &= ~PHY_BMCR_SPEEDSEL;
+	}
+
+	if ((media & IFM_GMASK) == IFM_FDX) {
+		printf("full duplex\n");
+		bmcr |= PHY_BMCR_DUPLEX;
+		XL_SEL_WIN(3);
+		CSR_WRITE_1(sc, XL_W3_MAC_CTRL, XL_MACCTRL_DUPLEX);
+	} else {
+		printf("half duplex\n");
+		bmcr &= ~PHY_BMCR_DUPLEX;
+		XL_SEL_WIN(3);
+		CSR_WRITE_1(sc, XL_W3_MAC_CTRL,
+			(CSR_READ_1(sc, XL_W3_MAC_CTRL) & ~XL_MACCTRL_DUPLEX));
+	}
+
+	xl_phy_writereg(sc, PHY_BMCR, bmcr);
+
+	return;
+}
+
+static void xl_setmode(sc, media)
+	struct xl_softc		*sc;
+	int			media;
+{
+	u_int32_t		icfg;
+	u_int16_t		mediastat;
+
+	printf("xl%d: selecting ", sc->xl_unit);
+
+	XL_SEL_WIN(4);
+	mediastat = CSR_READ_2(sc, XL_W4_MEDIA_STATUS);
+	XL_SEL_WIN(3);
+	icfg = CSR_READ_4(sc, XL_W3_INTERNAL_CFG);
+
+	if (sc->xl_media & XL_MEDIAOPT_BT) {
+		if (IFM_SUBTYPE(media) == IFM_10_T) {
+			printf("10baseT transceiver, ");
+			sc->xl_xcvr = XL_XCVR_10BT;
+			icfg &= ~XL_ICFG_CONNECTOR_MASK;
+			icfg |= (XL_XCVR_10BT << XL_ICFG_CONNECTOR_BITS);
+			mediastat |= XL_MEDIASTAT_LINKBEAT|
+					XL_MEDIASTAT_JABGUARD;
+			mediastat &= ~XL_MEDIASTAT_SQEENB;
+		}
+	}
+
+	if (sc->xl_media & XL_MEDIAOPT_BFX) {
+		if (IFM_SUBTYPE(media) == IFM_100_FX) {
+			printf("100baseFX port, ");
+			sc->xl_xcvr = XL_XCVR_100BFX;
+			icfg &= ~XL_ICFG_CONNECTOR_MASK;
+			icfg |= (XL_XCVR_100BFX << XL_ICFG_CONNECTOR_BITS);
+			mediastat |= XL_MEDIASTAT_LINKBEAT;
+			mediastat &= ~XL_MEDIASTAT_SQEENB;
+		}
+	}
+
+	if (sc->xl_media & XL_MEDIAOPT_AUI) {
+		if (IFM_SUBTYPE(media) == IFM_10_5) {
+			printf("AUI port, ");
+			sc->xl_xcvr = XL_XCVR_AUI;
+			icfg &= ~XL_ICFG_CONNECTOR_MASK;
+			icfg |= (XL_XCVR_AUI << XL_ICFG_CONNECTOR_BITS);
+			mediastat &= ~(XL_MEDIASTAT_LINKBEAT|
+					XL_MEDIASTAT_JABGUARD);
+			mediastat |= ~XL_MEDIASTAT_SQEENB;
+		}
+	}
+
+	if (sc->xl_media & XL_MEDIAOPT_BNC) {
+		if (IFM_SUBTYPE(media) == IFM_10_2) {
+			printf("BNC port, ");
+			sc->xl_xcvr = XL_XCVR_COAX;
+			icfg &= ~XL_ICFG_CONNECTOR_MASK;
+			icfg |= (XL_XCVR_COAX << XL_ICFG_CONNECTOR_BITS);
+			mediastat &= ~(XL_MEDIASTAT_LINKBEAT|
+					XL_MEDIASTAT_JABGUARD|
+					XL_MEDIASTAT_SQEENB);
+		}
+	}
+
+	if ((media & IFM_GMASK) == IFM_FDX ||
+			IFM_SUBTYPE(media) == IFM_100_FX) {
+		printf("full duplex\n");
+		XL_SEL_WIN(3);
+		CSR_WRITE_1(sc, XL_W3_MAC_CTRL, XL_MACCTRL_DUPLEX);
+	} else {
+		printf("half duplex\n");
+		XL_SEL_WIN(3);
+		CSR_WRITE_1(sc, XL_W3_MAC_CTRL,
+			(CSR_READ_1(sc, XL_W3_MAC_CTRL) & ~XL_MACCTRL_DUPLEX));
+	}
+
+	if (IFM_SUBTYPE(media) == IFM_10_2)
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_COAX_START);
+	else
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_COAX_STOP);
+	CSR_WRITE_4(sc, XL_W3_INTERNAL_CFG, icfg);
+	XL_SEL_WIN(4);
+	CSR_WRITE_2(sc, XL_W4_MEDIA_STATUS, mediastat);
+	DELAY(800);
+	XL_SEL_WIN(7);
+
+	return;
+}
+#endif
+
+static void xl_reset(sc)
+	struct xl_softc		*sc;
+{
+	XL_SEL_WIN(0);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RESET);
+	xl_wait(sc);
+
+	/* Wait a little while for the chip to get its brains in order. */
+	DELAY(1000);
+        return;
+}
+
+#if defined(__FreeBSD__)
+/*
+ * Probe for a 3Com Etherlink XL chip. Check the PCI vendor and device
+ * IDs against our list and return a device name if we find a match.
+ */
+static char *
+xl_probe(config_id, device_id)
+	pcici_t			config_id;
+	pcidi_t			device_id;
+{
+	struct xl_type		*t;
+
+	t = xl_devs;
+
+	while(t->xl_name != NULL) {
+		if ((device_id & 0xFFFF) == t->xl_vid &&
+		    ((device_id >> 16) & 0xFFFF) == t->xl_did) {
+			return(t->xl_name);
+		}
+		t++;
+	}
+
+	return(NULL);
+}
+#endif
+
+/*
+ * This routine is a kludge to work around possible hardware faults
+ * or manufacturing defects that can cause the media options register
+ * (or reset options register, as it's called for the first generation
+ * 3cx90x adapters) to return an incorrect result. I have encountered
+ * one Dell Latitude laptop docking station with an integrated 3c905-TX
+ * which doesn't have any of the 'mediaopt' bits set. This screws up
+ * the attach routine pretty badly because it doesn't know what media
+ * to look for. If we find ourselves in this predicament, this routine
+ * will try to guess the media options values and warn the user of a
+ * possible manufacturing defect with his adapter/system/whatever.
+ */
+static void xl_mediacheck(sc)
+	struct xl_softc		*sc;
+{
+	u_int16_t		devid;
+
+	/*
+	 * If some of the media options bits are set, assume they are
+	 * correct. If not, try to figure it out down below.
+	 * XXX I should check for 10baseFL, but I don't have an adapter
+	 * to test with.
+	 */
+	if (sc->xl_media & (XL_MEDIAOPT_MASK & ~XL_MEDIAOPT_VCO))
+		return;
+
+	printf("xl%d: WARNING: no media options bits set in "
+		"the media options register!!\n", sc->xl_unit);
+	printf("xl%d: this could be a manufacturing defect in "
+		"your adapter or system\n", sc->xl_unit);
+	printf("xl%d: attempting to guess media type; you "
+		"should probably consult your vendor\n", sc->xl_unit);
+
+	/*
+	 * Read the device ID from the EEPROM.
+	 * This is what's loaded into the PCI device ID register, so it has
+	 * to be correct otherwise we wouldn't have gotten this far.
+	 */
+	xl_read_eeprom(sc, (caddr_t)&devid, XL_EE_PRODID, 1, 0);
+
+	switch(devid) {
+	case TC_DEVICEID_BOOMERANG_10BT:	/* 3c900-TP */
+	case TC_DEVICEID_CYCLONE_10BT:		/* 3c905B-TP */
+		sc->xl_media = XL_MEDIAOPT_BT;
+		printf("xl%d: guessing 10BaseT transceiver\n", sc->xl_unit);
+		break;
+	case TC_DEVICEID_BOOMERANG_10BT_COMBO:	/* 3c900-COMBO */
+	case TC_DEVICEID_CYCLONE_10BT_COMBO:	/* 3c905B-COMBO */
+		sc->xl_media = XL_MEDIAOPT_BT|XL_MEDIAOPT_BNC|XL_MEDIAOPT_AUI;
+		printf("xl%d: guessing COMBO (AUI/BNC/TP)\n", sc->xl_unit);
+		break;
+	case TC_DEVICEID_BOOMERANG_10_100BT:	/* 3c905-TX */
+		sc->xl_media = XL_MEDIAOPT_MII;
+		printf("xl%d: guessing MII\n", sc->xl_unit);
+		break;
+	case TC_DEVICEID_BOOMERANG_100BT4:	/* 3c905-T4 */
+	case TC_DEVICEID_CYCLONE_10_100BT4:	/* 3c905B-T4 */
+		sc->xl_media = XL_MEDIAOPT_BT4;
+		printf("xl%d: guessing 100BaseT4/MII\n", sc->xl_unit);
+		break;
+	case TC_DEVICEID_CYCLONE_10_100BT:	/* 3c905B-TX */
+		sc->xl_media = XL_MEDIAOPT_BTX;
+		printf("xl%d: guessing 10/100 internal\n", sc->xl_unit);
+		break;
+	default:
+		printf("xl%d: unknown device ID: %x -- "
+			"defaulting to 10baseT\n", sc->xl_unit, devid);
+		sc->xl_media = XL_MEDIAOPT_BT;
+		break;
+	}
+
+	return;
+}
+
+#if defined(__FreeBSD__)
+/*
+ * Attach the interface. Allocate softc structures, do ifmedia
+ * setup and ethernet/BPF attach.
+ */
+static void
+xl_attach(config_id, unit)
+	pcici_t			config_id;
+	int			unit;
+{
+	int			s, i;
+#ifndef XL_USEIOSPACE
+	vm_offset_t		pbase, vbase;
+#endif
+	u_char			eaddr[ETHER_ADDR_LEN];
+	u_int32_t		command;
+	struct xl_softc		*sc;
+	struct ifnet		*ifp;
+	int			media = IFM_ETHER|IFM_100_TX|IFM_FDX;
+	unsigned int		round;
+	caddr_t			roundptr;
+	struct xl_type		*p;
+	u_int16_t		phy_vid, phy_did, phy_sts;
+
+	s = splimp();
+
+	sc = malloc(sizeof(struct xl_softc), M_DEVBUF, M_NOWAIT);
+	if (sc == NULL) {
+		printf("xl%d: no memory for softc struct!\n", unit);
+		return;
+	}
+	bzero(sc, sizeof(struct xl_softc));
+
+	/*
+	 * If this is a 3c905B, we have to check one extra thing.
+	 * The 905B supports power management and may be placed in
+	 * a low-power mode (D3 mode), typically by certain operating
+	 * systems which shall not be named. The PCI BIOS is supposed
+	 * to reset the NIC and bring it out of low-power mode, but
+	 * some do not. Consequently, we have to see if this chip
+	 * supports power management, and if so, make sure it's not
+	 * in low-power mode. If power management is available, the
+	 * capid byte will be 0x01.
+	 *
+	 * I _think_ that what actually happens is that the chip
+	 * loses its PCI configuration during the transition from
+	 * D3 back to D0; this means that it should be possible for
+	 * us to save the PCI iobase, membase and IRQ, put the chip
+	 * back in the D0 state, then restore the PCI config ourselves.
+	 */
+
+	command = pci_conf_read(config_id, XL_PCI_CAPID) & 0x000000FF;
+	if (command == 0x01) {
+
+		command = pci_conf_read(config_id, XL_PCI_PWRMGMTCTRL);
+		if (command & XL_PSTATE_MASK) {
+			u_int32_t		iobase, membase, irq;
+
+			/* Save important PCI config data. */
+			iobase = pci_conf_read(config_id, XL_PCI_LOIO);
+			membase = pci_conf_read(config_id, XL_PCI_LOMEM);
+			irq = pci_conf_read(config_id, XL_PCI_INTLINE);
+
+			/* Reset the power state. */
+			printf("xl%d: chip is is in D%d power mode "
+			"-- setting to D0\n", unit, command & XL_PSTATE_MASK);
+			command &= 0xFFFFFFFC;
+			pci_conf_write(config_id, XL_PCI_PWRMGMTCTRL, command);
+
+			/* Restore PCI config data. */
+			pci_conf_write(config_id, XL_PCI_LOIO, iobase);
+			pci_conf_write(config_id, XL_PCI_LOMEM, membase);
+			pci_conf_write(config_id, XL_PCI_INTLINE, irq);
+		}
+	}
+
+	/*
+	 * Map control/status registers.
+	 */
+	command = pci_conf_read(config_id, PCI_COMMAND_STATUS_REG);
+	command |= (PCIM_CMD_PORTEN|PCIM_CMD_MEMEN|PCIM_CMD_BUSMASTEREN);
+	pci_conf_write(config_id, PCI_COMMAND_STATUS_REG, command);
+	command = pci_conf_read(config_id, PCI_COMMAND_STATUS_REG);
+
+#ifdef XL_USEIOSPACE
+	if (!(command & PCIM_CMD_PORTEN)) {
+		printf("xl%d: failed to enable I/O ports!\n", unit);
+		free(sc, M_DEVBUF);
+		goto fail;
+	}
+
+	sc->iobase = pci_conf_read(config_id, XL_PCI_LOIO) & 0xFFFFFFE0;
+#else
+	if (!(command & PCIM_CMD_MEMEN)) {
+		printf("xl%d: failed to enable memory mapping!\n", unit);
+		goto fail;
+	}
+
+	if (!pci_map_mem(config_id, XL_PCI_LOMEM, &vbase, &pbase)) {
+		printf ("xl%d: couldn't map memory\n", unit);
+		goto fail;
+	}
+	sc->csr = (volatile caddr_t)vbase;
+#endif
+
+	/* Allocate interrupt */
+	if (!pci_map_int(config_id, xl_intr, sc, &net_imask)) {
+		printf("xl%d: couldn't map interrupt\n", unit);
+		goto fail;
+	}
+
+	/* Reset the adapter. */
+	xl_reset(sc);
+
+	/*
+	 * Get station address from the EEPROM.
+	 */
+	if (xl_read_eeprom(sc, (caddr_t)&eaddr, XL_EE_OEM_ADR0, 3, 1)) {
+		printf("xl%d: failed to read station address\n", sc->xl_unit);
+		free(sc, M_DEVBUF);
+		goto fail;
+	}
+
+	/*
+	 * A 3Com chip was detected. Inform the world.
+	 */
+	printf("xl%d: Ethernet address: %6D\n", unit, eaddr, ":");
+
+	sc->xl_unit = unit;
+	callout_handle_init(&sc->xl_stat_ch);
+	bcopy(eaddr, (char *)&sc->arpcom.ac_enaddr, ETHER_ADDR_LEN);
+
+	sc->xl_ldata_ptr = malloc(sizeof(struct xl_list_data) + 8,
+				M_DEVBUF, M_NOWAIT);
+	if (sc->xl_ldata_ptr == NULL) {
+		free(sc, M_DEVBUF);
+		printf("xl%d: no memory for list buffers!\n", unit);
+		return;
+	}
+
+	sc->xl_ldata = (struct xl_list_data *)sc->xl_ldata_ptr;
+	round = (unsigned int)sc->xl_ldata_ptr & 0xF;
+	roundptr = sc->xl_ldata_ptr;
+	for (i = 0; i < 8; i++) {
+		if (round % 8) {
+			round++;
+			roundptr++;
+		}
+			break;
+	}
+	sc->xl_ldata = (struct xl_list_data *)roundptr;
+	bzero(sc->xl_ldata, sizeof(struct xl_list_data));
+
+	ifp = &sc->arpcom.ac_if;
+	ifp->if_softc = sc;
+	ifp->if_unit = unit;
+	ifp->if_name = "xl";
+	ifp->if_mtu = ETHERMTU;
+	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
+	ifp->if_ioctl = xl_ioctl;
+	ifp->if_output = ether_output;
+	ifp->if_start = xl_start;
+	ifp->if_watchdog = xl_watchdog;
+	ifp->if_init = xl_init;
+	ifp->if_baudrate = 10000000;
+
+	/*
+	 * Figure out the card type. 3c905B adapters have the
+	 * 'supportsNoTxLength' bit set in the capabilities
+	 * word in the EEPROM.
+	 */
+	xl_read_eeprom(sc, (caddr_t)&sc->xl_caps, XL_EE_CAPS, 1, 0);
+	if (sc->xl_caps & XL_CAPS_NO_TXLENGTH)
+		sc->xl_type = XL_TYPE_905B;
+	else
+		sc->xl_type = XL_TYPE_90X;
+
+	/*
+	 * Now we have to see what sort of media we have.
+	 * This includes probing for an MII interace and a
+	 * possible PHY.
+	 */
+	XL_SEL_WIN(3);
+	sc->xl_media = CSR_READ_2(sc, XL_W3_MEDIA_OPT);
+	if (bootverbose)
+		printf("xl%d: media options word: %x\n", sc->xl_unit,
+							 sc->xl_media);
+
+	xl_mediacheck(sc);
+
+	xl_read_eeprom(sc, (char *)&sc->xl_xcvr, XL_EE_ICFG_0, 2, 0);
+	sc->xl_xcvr &= XL_ICFG_CONNECTOR_MASK;
+	sc->xl_xcvr >>= XL_ICFG_CONNECTOR_BITS;
+	if (sc->xl_media & XL_MEDIAOPT_MII || sc->xl_media & XL_MEDIAOPT_BTX
+			|| sc->xl_media & XL_MEDIAOPT_BT4) {
+		/*
+		 * In theory I shouldn't need this, but... if this
+		 * card supports an MII, either an external one or
+		 * an internal fake one, select it in the internal
+		 * config register before trying to probe it.
+		 */
+		u_int32_t		icfg;
+
+		XL_SEL_WIN(3);
+		icfg = CSR_READ_4(sc, XL_W3_INTERNAL_CFG);
+		icfg &= ~XL_ICFG_CONNECTOR_MASK;
+		if (sc->xl_media & XL_MEDIAOPT_MII ||
+			sc->xl_media & XL_MEDIAOPT_BT4)
+			icfg |= (XL_XCVR_MII << XL_ICFG_CONNECTOR_BITS);
+		if (sc->xl_media & XL_MEDIAOPT_BTX)
+			icfg |= (XL_XCVR_AUTO << XL_ICFG_CONNECTOR_BITS);
+		if (sc->xl_media & XL_MEDIAOPT_BFX)
+			icfg |= (XL_XCVR_100BFX << XL_ICFG_CONNECTOR_BITS);
+		CSR_WRITE_4(sc, XL_W3_INTERNAL_CFG, icfg);
+
+		if (bootverbose)
+			printf("xl%d: probing for a PHY\n", sc->xl_unit);
+		for (i = XL_PHYADDR_MIN; i < XL_PHYADDR_MAX + 1; i++) {
+			if (bootverbose)
+				printf("xl%d: checking address: %d\n",
+							sc->xl_unit, i);
+			sc->xl_phy_addr = i;
+			xl_phy_writereg(sc, XL_PHY_GENCTL, PHY_BMCR_RESET);
+			DELAY(500);
+			while(xl_phy_readreg(sc, XL_PHY_GENCTL)
+					& PHY_BMCR_RESET);
+			if ((phy_sts = xl_phy_readreg(sc, XL_PHY_GENSTS)))
+				break;
+		}
+		if (phy_sts) {
+			phy_vid = xl_phy_readreg(sc, XL_PHY_VENID);
+			phy_did = xl_phy_readreg(sc, XL_PHY_DEVID);
+			if (bootverbose)
+				printf("xl%d: found PHY at address %d, ",
+						sc->xl_unit, sc->xl_phy_addr);
+			if (bootverbose)
+				printf("vendor id: %x device id: %x\n",
+					phy_vid, phy_did);
+			p = xl_phys;
+			while(p->xl_vid) {
+				if (phy_vid == p->xl_vid &&
+					(phy_did | 0x000F) == p->xl_did) {
+					sc->xl_pinfo = p;
+					break;
+				}
+				p++;
+			}
+			if (sc->xl_pinfo == NULL)
+				sc->xl_pinfo = &xl_phys[PHY_UNKNOWN];
+			if (bootverbose)
+				printf("xl%d: PHY type: %s\n",
+					sc->xl_unit, sc->xl_pinfo->xl_name);
+		} else {
+			printf("xl%d: MII without any phy!\n", sc->xl_unit);
+		}
+	}
+
+	/*
+	 * Do ifmedia setup.
+	 */
+	ifmedia_init(&sc->ifmedia, 0, xl_ifmedia_upd, xl_ifmedia_sts);
+
+	if (sc->xl_media & XL_MEDIAOPT_BT) {
+		if (bootverbose)
+			printf("xl%d: found 10baseT\n", sc->xl_unit);
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_10_T, 0, NULL);
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_10_T|IFM_HDX, 0, NULL);
+		if (sc->xl_caps & XL_CAPS_FULL_DUPLEX)
+			ifmedia_add(&sc->ifmedia,
+				IFM_ETHER|IFM_10_T|IFM_FDX, 0, NULL);
+	}
+
+	if (sc->xl_media & XL_MEDIAOPT_AUI) {
+		if (bootverbose)
+			printf("xl%d: found AUI\n", sc->xl_unit);
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_10_5, 0, NULL);
+	}
+
+	if (sc->xl_media & XL_MEDIAOPT_BNC) {
+		if (bootverbose)
+			printf("xl%d: found BNC\n", sc->xl_unit);
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_10_2, 0, NULL);
+	}
+
+	/*
+	 * Technically we could use xl_getmode_mii() to scan the
+	 * modes, but the built-in BTX mode on the 3c905B implies
+	 * 10/100 full/half duplex support anyway, so why not just
+	 * do it and get it over with.
+	 */
+	if (sc->xl_media & XL_MEDIAOPT_BTX) {
+		if (bootverbose)
+			printf("xl%d: found 100baseTX\n", sc->xl_unit);
+		ifp->if_baudrate = 100000000;
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_100_TX, 0, NULL);
+		ifmedia_add(&sc->ifmedia,
+			IFM_ETHER|IFM_100_TX|IFM_HDX, 0, NULL);
+		if (sc->xl_caps & XL_CAPS_FULL_DUPLEX)
+			ifmedia_add(&sc->ifmedia,
+				IFM_ETHER|IFM_100_TX|IFM_FDX, 0, NULL);
+		if (sc->xl_pinfo != NULL)
+			ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_AUTO, 0, NULL);
+	}
+
+	if (sc->xl_media & XL_MEDIAOPT_BFX) {
+		if (bootverbose)
+			printf("xl%d: found 100baseFX\n", sc->xl_unit);
+		ifp->if_baudrate = 100000000;
+		ifmedia_add(&sc->ifmedia, IFM_ETHER|IFM_100_FX, 0, NULL);
+	}
+
+	/*
+	 * If there's an MII, we have to probe its modes
+	 * separately.
+	 */
+	if (sc->xl_media & XL_MEDIAOPT_MII || sc->xl_media & XL_MEDIAOPT_BT4) {
+		if (bootverbose)
+			printf("xl%d: found MII\n", sc->xl_unit);
+		xl_getmode_mii(sc);
+	}
+
+	/* Choose a default media. */
+	switch(sc->xl_xcvr) {
+	case XL_XCVR_10BT:
+		media = IFM_ETHER|IFM_10_T;
+		xl_setmode(sc, media);
+		break;
+	case XL_XCVR_AUI:
+		media = IFM_ETHER|IFM_10_5;
+		xl_setmode(sc, media);
+		break;
+	case XL_XCVR_COAX:
+		media = IFM_ETHER|IFM_10_2;
+		xl_setmode(sc, media);
+		break;
+	case XL_XCVR_AUTO:
+		media = IFM_ETHER|IFM_AUTO;
+		xl_autoneg_mii(sc, XL_FLAG_SCHEDDELAY, 1);
+		break;
+	case XL_XCVR_100BTX:
+	case XL_XCVR_MII:
+		media = sc->ifmedia.ifm_media;
+		xl_autoneg_mii(sc, XL_FLAG_SCHEDDELAY, 1);
+		break;
+	case XL_XCVR_100BFX:
+		media = IFM_ETHER|IFM_100_FX;
+		break;
+	default:
+		printf("xl%d: unknown XCVR type: %d\n", sc->xl_unit,
+							sc->xl_xcvr);
+		break;
+	}
+
+	ifmedia_set(&sc->ifmedia, media);
+
+	/*
+	 * Call MI attach routines.
+	 */
+	if_attach(ifp);
+	ether_ifattach(ifp);
+
+#if NBPFILTER > 0
+	bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
+#endif
+	at_shutdown(xl_shutdown, sc, SHUTDOWN_POST_SYNC);
+
+fail:
+	splx(s);
+	return;
+}
+#endif
+
+/*
+ * Initialize the transmit descriptors.
+ */
+static int xl_list_tx_init(sc)
+	struct xl_softc		*sc;
+{
+	struct xl_chain_data	*cd;
+	struct xl_list_data	*ld;
+	int			i;
+
+	cd = &sc->xl_cdata;
+	ld = sc->xl_ldata;
+	for (i = 0; i < XL_TX_LIST_CNT; i++) {
+		cd->xl_tx_chain[i].xl_ptr = &ld->xl_tx_list[i];
+		if (i == (XL_TX_LIST_CNT - 1))
+			cd->xl_tx_chain[i].xl_next = NULL;
+		else
+			cd->xl_tx_chain[i].xl_next = &cd->xl_tx_chain[i + 1];
+	}
+
+	cd->xl_tx_free = &cd->xl_tx_chain[0];
+	cd->xl_tx_tail = cd->xl_tx_head = NULL;
+
+	return(0);
+}
+
+/*
+ * Initialize the RX descriptors and allocate mbufs for them. Note that
+ * we arrange the descriptors in a closed ring, so that the last descriptor
+ * points back to the first.
+ */
+static int xl_list_rx_init(sc)
+	struct xl_softc		*sc;
+{
+	struct xl_chain_data	*cd;
+	struct xl_list_data	*ld;
+	int			i;
+
+	cd = &sc->xl_cdata;
+	ld = sc->xl_ldata;
+
+	for (i = 0; i < XL_RX_LIST_CNT; i++) {
+		cd->xl_rx_chain[i].xl_ptr =
+			(struct xl_list_onefrag *)&ld->xl_rx_list[i];
+		xl_newbuf(sc, &cd->xl_rx_chain[i]);
+		if (i == (XL_RX_LIST_CNT - 1)) {
+			cd->xl_rx_chain[i].xl_next = &cd->xl_rx_chain[0];
+			ld->xl_rx_list[i].xl_next =
+					vtophys(&ld->xl_rx_list[0]);
+		} else {
+			cd->xl_rx_chain[i].xl_next = &cd->xl_rx_chain[i + 1];
+			ld->xl_rx_list[i].xl_next =
+					vtophys(&ld->xl_rx_list[i + 1]);
+		}
+	}
+
+	cd->xl_rx_head = &cd->xl_rx_chain[0];
+
+	return(0);
+}
+
+/*
+ * Initialize an RX descriptor and attach an MBUF cluster.
+ */
+static int xl_newbuf(sc, c)
+	struct xl_softc		*sc;
+	struct xl_chain_onefrag	*c;
+{
+	struct mbuf		*m_new = NULL;
+
+	MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+	if (m_new == NULL) {
+		printf("xl%d: no memory for rx list",
+				sc->xl_unit);
+		return(ENOBUFS);
+	}
+
+	MCLGET(m_new, M_DONTWAIT);
+	if (!(m_new->m_flags & M_EXT)) {
+		printf("xl%d: no memory for rx list", sc->xl_unit);
+		m_freem(m_new);
+		return(ENOBUFS);
+	}
+
+	c->xl_mbuf = m_new;
+	c->xl_ptr->xl_status = 0;
+	c->xl_ptr->xl_frag.xl_addr = vtophys(mtod(m_new, caddr_t));
+	c->xl_ptr->xl_frag.xl_len = MCLBYTES | XL_LAST_FRAG;
+
+	return(0);
+}
+
+/*
+ * A frame has been uploaded: pass the resulting mbuf chain up to
+ * the higher level protocols.
+ */
+static void xl_rxeof(sc)
+	struct xl_softc		*sc;
+{
+        struct ether_header	*eh;
+        struct mbuf		*m;
+        struct ifnet		*ifp;
+	struct xl_chain_onefrag	*cur_rx;
+	int			total_len = 0;
+	u_int16_t		rxstat;
+
+	ifp = &sc->arpcom.ac_if;
+
+again:
+
+	while((rxstat = sc->xl_cdata.xl_rx_head->xl_ptr->xl_status)) {
+		cur_rx = sc->xl_cdata.xl_rx_head;
+		/*
+		 * If an error occurs, update stats, clear the
+		 * status word and leave the mbuf cluster in place:
+		 * it should simply get re-used next time this descriptor
+	 	 * comes up in the ring.
+		 */
+		if (rxstat & XL_RXSTAT_UP_ERROR) {
+			ifp->if_ierrors++;
+			cur_rx->xl_ptr->xl_status = 0;
+			sc->xl_cdata.xl_rx_head = cur_rx->xl_next;
+			continue;
+		}
+
+		/*
+		 * If there error bit was not set, the upload complete
+		 * bit should be set which means we have a valid packet.
+		 * If not, something truly strange has happened.
+		 */
+		if (!(rxstat & XL_RXSTAT_UP_CMPLT)) {
+			printf("xl%d: bad receive status -- packet dropped",
+							sc->xl_unit);
+			ifp->if_ierrors++;
+			cur_rx->xl_ptr->xl_status = 0;
+			sc->xl_cdata.xl_rx_head = cur_rx->xl_next;
+			continue;
+		}
+
+		/* No errors; receive the packet. */	
+		sc->xl_cdata.xl_rx_head = cur_rx->xl_next;
+		m = cur_rx->xl_mbuf;
+		total_len = cur_rx->xl_ptr->xl_status & XL_RXSTAT_LENMASK;
+		xl_newbuf(sc, cur_rx);
+
+		eh = mtod(m, struct ether_header *);
+		m->m_pkthdr.rcvif = ifp;
+#if NBPFILTER > 0
+		/*
+		 * Handle BPF listeners. Let the BPF user see the packet, but
+		 * don't pass it up to the ether_input() layer unless it's
+		 * a broadcast packet, multicast packet, matches our ethernet
+		 * address or the interface is in promiscuous mode.
+		 */
+		if (ifp->if_bpf) {
+			m->m_pkthdr.len = m->m_len = total_len;
+#ifdef __FreeBSD__
+			bpf_mtap(ifp, m);
+#else
+			bpf_mtap(ifp->if_bpf, m);
+#endif
+			if (ifp->if_flags & IFF_PROMISC &&
+				(bcmp(eh->ether_dhost, sc->arpcom.ac_enaddr,
+						ETHER_ADDR_LEN) &&
+					(eh->ether_dhost[0] & 1) == 0)) {
+				m_freem(m);
+				continue;
+			}
+		}
+#endif
+		/* Remove header from mbuf and pass it on. */
+		m->m_pkthdr.len = m->m_len =
+				total_len - sizeof(struct ether_header);
+		m->m_data += sizeof(struct ether_header);
+		ether_input(ifp, eh, m);
+	}
+
+	/*
+	 * Handle the 'end of channel' condition. When the upload
+	 * engine hits the end of the RX ring, it will stall. This
+	 * is our cue to flush the RX ring, reload the uplist pointer
+	 * register and unstall the engine.
+	 * XXX This is actually a little goofy. With the ThunderLAN
+	 * chip, you get an interrupt when the receiver hits the end
+	 * of the receive ring, which tells you exactly when you
+	 * you need to reload the ring pointer. Here we have to
+	 * fake it. I'm mad at myself for not being clever enough
+	 * to avoid the use of a goto here.
+	 */
+	if (CSR_READ_4(sc, XL_UPLIST_PTR) == 0 ||
+		CSR_READ_4(sc, XL_UPLIST_STATUS) & XL_PKTSTAT_UP_STALLED) {
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_UP_STALL);
+		xl_wait(sc);
+		CSR_WRITE_4(sc, XL_UPLIST_PTR,
+			vtophys(&sc->xl_ldata->xl_rx_list[0]));
+		sc->xl_cdata.xl_rx_head = &sc->xl_cdata.xl_rx_chain[0];
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_UP_UNSTALL);
+		goto again;
+	}
+
+	return;
+}
+
+/*
+ * A frame was downloaded to the chip. It's safe for us to clean up
+ * the list buffers.
+ */
+static void xl_txeof(sc)
+	struct xl_softc		*sc;
+{
+	struct xl_chain		*cur_tx;
+	struct ifnet		*ifp;
+
+	ifp = &sc->arpcom.ac_if;
+
+	/* Clear the timeout timer. */
+	ifp->if_timer = 0;
+
+	/*
+	 * Go through our tx list and free mbufs for those
+	 * frames that have been uploaded. Note: the 3c905B
+	 * sets a special bit in the status word to let us
+	 * know that a frame has been downloaded, but the
+	 * original 3c900/3c905 adapters don't do that.
+	 * Consequently, we have to use a different test if
+	 * xl_type != XL_TYPE_905B.
+	 */
+	while(sc->xl_cdata.xl_tx_head != NULL) {
+		cur_tx = sc->xl_cdata.xl_tx_head;
+		if ((sc->xl_type == XL_TYPE_905B &&
+		!(cur_tx->xl_ptr->xl_status & XL_TXSTAT_DL_COMPLETE)) ||
+			CSR_READ_4(sc, XL_DOWNLIST_PTR)) {
+			break;
+		}
+		sc->xl_cdata.xl_tx_head = cur_tx->xl_next;
+
+		m_freem(cur_tx->xl_mbuf);
+		cur_tx->xl_mbuf = NULL;
+
+		cur_tx->xl_next = sc->xl_cdata.xl_tx_free;
+		sc->xl_cdata.xl_tx_free = cur_tx;
+		if (!cur_tx->xl_ptr->xl_next);
+			break;
+	}
+
+	if (sc->xl_cdata.xl_tx_head == NULL) {
+		ifp->if_flags &= ~IFF_OACTIVE;
+		sc->xl_cdata.xl_tx_tail = NULL;
+		if (sc->xl_want_auto)
+			xl_autoneg_mii(sc, XL_FLAG_SCHEDDELAY, 1);
+
+	} else {
+		if (CSR_READ_4(sc, XL_DMACTL) & XL_DMACTL_DOWN_STALLED) {
+			CSR_WRITE_4(sc, XL_DOWNLIST_PTR,
+				vtophys(sc->xl_cdata.xl_tx_head->xl_ptr));
+			CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_DOWN_UNSTALL);
+		}
+	}
+
+	return;
+}
+
+/*
+ * TX 'end of channel' interrupt handler. Actually, we should
+ * only get a 'TX complete' interrupt if there's a transmit error,
+ * so this is really TX error handler.
+ */
+static void xl_txeoc(sc)
+	struct xl_softc		*sc;
+{
+	u_int8_t		txstat;
+
+	while((txstat = CSR_READ_1(sc, XL_TX_STATUS))) {
+		if (txstat & XL_TXSTATUS_UNDERRUN ||
+			txstat & XL_TXSTATUS_JABBER ||
+			txstat & XL_TXSTATUS_RECLAIM) {
+			printf("xl%d: transmission error: %x\n",
+						sc->xl_unit, txstat);
+			CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_TX_RESET);
+			xl_wait(sc);
+			CSR_WRITE_4(sc, XL_DOWNLIST_PTR,
+				vtophys(sc->xl_cdata.xl_tx_head->xl_ptr));
+			/*
+			 * Remember to set this for the
+			 * first generation 3c90X chips.
+			 */
+			CSR_WRITE_1(sc, XL_TX_FREETHRESH, XL_PACKET_SIZE >> 8);
+			CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_TX_ENABLE);
+			CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_DOWN_UNSTALL);
+		} else {
+			CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_TX_ENABLE);
+			CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_DOWN_UNSTALL);
+		}
+		/*
+		 * Write an arbitrary byte to the TX_STATUS register
+	 	 * to clear this interrupt/error and advance to the next.
+		 */
+		CSR_WRITE_1(sc, XL_TX_STATUS, 0x01);
+	}
+
+	return;
+}
+
+#ifdef __OpenBSD__
+static int xl_intr(arg)
+	void			*arg;
+#else
+static void xl_intr(arg)
+	void			*arg;
+#endif
+{
+	struct xl_softc		*sc;
+	struct ifnet		*ifp;
+	u_int16_t		status;
+#ifdef __OpenBSD__
+	int claimed = 0;
+#endif
+	sc = arg;
+	ifp = &sc->arpcom.ac_if;
+
+	/* Disable interrupts. */
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_INTR_ENB);
+
+	for (;;) {
+
+		status = CSR_READ_2(sc, XL_STATUS);
+
+		if ((status & XL_INTRS) == 0)
+			break;
+
+#ifdef __OpenBSD__
+		claimed = 1;
+#endif
+
+		if (status & XL_STAT_UP_COMPLETE) {
+			xl_rxeof(sc);
+			CSR_WRITE_2(sc, XL_COMMAND,
+				XL_CMD_INTR_ACK|XL_STAT_UP_COMPLETE);
+		}
+
+		if (status & XL_STAT_DOWN_COMPLETE) {
+			xl_txeof(sc);
+			CSR_WRITE_2(sc, XL_COMMAND,
+				XL_CMD_INTR_ACK|XL_STAT_DOWN_COMPLETE);
+		}
+
+		if (status & XL_STAT_TX_COMPLETE) {
+			ifp->if_oerrors++;
+			xl_txeoc(sc);
+			CSR_WRITE_2(sc, XL_COMMAND,
+				XL_CMD_INTR_ACK|XL_STAT_TX_COMPLETE);
+		}
+
+		if (status & XL_STAT_ADFAIL) {
+			xl_reset(sc);
+			xl_init(sc);
+			CSR_WRITE_2(sc, XL_COMMAND,
+				XL_CMD_INTR_ACK|XL_STAT_ADFAIL);
+		}
+
+		if (status & XL_STAT_STATSOFLOW) {
+			sc->xl_stats_no_timeout = 1;
+			xl_stats_update(sc);
+			sc->xl_stats_no_timeout = 0;
+		}
+
+		CSR_WRITE_2(sc, XL_STATUS, XL_CMD_INTR_ACK|XL_STAT_INTREQ|
+							XL_STAT_INTLATCH);
+	}
+
+	/* Re-enable interrupts. */
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_INTR_ENB|XL_INTRS);
+
+	XL_SEL_WIN(7);
+
+	if (ifp->if_snd.ifq_head != NULL) {
+		xl_start(ifp);
+	}
+
+#ifdef __OpenBSD__
+	return claimed;
+#else
+	return;
+#endif
+}
+
+static void xl_stats_update(xsc)
+	void			*xsc;
+{
+	struct xl_softc		*sc;
+	struct ifnet		*ifp;
+	struct xl_stats		xl_stats;
+	u_int8_t		*p;
+	int			i;
+
+	bzero((char *)&xl_stats, sizeof(struct xl_stats));
+
+	sc = xsc;
+	ifp = &sc->arpcom.ac_if;
+
+	p = (u_int8_t *)&xl_stats;
+
+	/* Read all the stats registers. */
+	XL_SEL_WIN(6);
+
+	for (i = 0; i < 16; i++)
+		*p++ = CSR_READ_1(sc, XL_W6_CARRIER_LOST + i);
+
+	ifp->if_ipackets += xl_rx_goodframes(xl_stats);
+	ifp->if_opackets += xl_tx_goodframes(xl_stats);
+
+	ifp->if_ierrors += xl_stats.xl_rx_overrun;
+
+	ifp->if_collisions += xl_stats.xl_tx_multi_collision +
+				xl_stats.xl_tx_single_collision +
+				xl_stats.xl_tx_late_collision;
+
+	/*
+	 * Boomerang and cyclone chips have an extra stats counter
+	 * in window 4 (BadSSD). We have to read this too in order
+	 * to clear out all the stats registers and avoid a statsoflow
+	 * interrupt.
+	 */
+	XL_SEL_WIN(4);
+	CSR_READ_1(sc, XL_W4_BADSSD);
+
+	XL_SEL_WIN(7);
+
+	if (!sc->xl_stats_no_timeout)
+#ifdef __FreeBSD__
+		sc->xl_stat_ch = timeout(xl_stats_update, sc, hz);
+#else
+		timeout(xl_stats_update, sc, hz);
+#endif
+
+	return;
+}
+
+/*
+ * Encapsulate an mbuf chain in a descriptor by coupling the mbuf data
+ * pointers to the fragment pointers.
+ */
+static int xl_encap(sc, c, m_head)
+	struct xl_softc		*sc;
+	struct xl_chain		*c;
+	struct mbuf		*m_head;
+{
+	int			frag = 0;
+	struct xl_frag		*f = NULL;
+	int			total_len;
+	struct mbuf		*m;
+
+	/*
+ 	 * Start packing the mbufs in this chain into
+	 * the fragment pointers. Stop when we run out
+ 	 * of fragments or hit the end of the mbuf chain.
+	 */
+	m = m_head;
+	total_len = 0;
+
+	for (m = m_head, frag = 0; m != NULL; m = m->m_next) {
+		if (m->m_len != 0) {
+			if (frag == XL_MAXFRAGS)
+				break;
+			total_len+= m->m_len;
+			c->xl_ptr->xl_frag[frag].xl_addr =
+					vtophys(mtod(m, vm_offset_t));
+			c->xl_ptr->xl_frag[frag].xl_len = m->m_len;
+			frag++;
+		}
+	}
+
+	/*
+	 * Handle special case: we used up all 63 fragments,
+	 * but we have more mbufs left in the chain. Copy the
+	 * data into an mbuf cluster. Note that we don't
+	 * bother clearing the values in the other fragment
+	 * pointers/counters; it wouldn't gain us anything,
+	 * and would waste cycles.
+	 */
+	if (m != NULL) {
+		struct mbuf		*m_new = NULL;
+
+		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		if (m_new == NULL) {
+			printf("xl%d: no memory for tx list", sc->xl_unit);
+			return(1);
+		}
+		if (m_head->m_pkthdr.len > MHLEN) {
+			MCLGET(m_new, M_DONTWAIT);
+			if (!(m_new->m_flags & M_EXT)) {
+				m_freem(m_new);
+				printf("xl%d: no memory for tx list",
+						sc->xl_unit);
+				return(1);
+			}
+		}
+		m_copydata(m_head, 0, m_head->m_pkthdr.len,	
+					mtod(m_new, caddr_t));
+		m_new->m_pkthdr.len = m_new->m_len = m_head->m_pkthdr.len;
+		m_freem(m_head);
+		m_head = m_new;
+		f = &c->xl_ptr->xl_frag[0];
+		f->xl_addr = vtophys(mtod(m_new, caddr_t));
+		f->xl_len = total_len = m_new->m_len;
+		frag = 1;
+	}
+
+	c->xl_mbuf = m_head;
+	c->xl_ptr->xl_frag[frag - 1].xl_len |=  XL_LAST_FRAG;
+	c->xl_ptr->xl_status = total_len;
+	c->xl_ptr->xl_next = 0;
+
+	return(0);
+}
+
+/*
+ * Main transmit routine. To avoid having to do mbuf copies, we put pointers
+ * to the mbuf data regions directly in the transmit lists. We also save a
+ * copy of the pointers since the transmit list fragment pointers are
+ * physical addresses.
+ */
+
+static void xl_start(ifp)
+	struct ifnet		*ifp;
+{
+	struct xl_softc		*sc;
+	struct mbuf		*m_head = NULL;
+	struct xl_chain		*prev = NULL, *cur_tx = NULL, *start_tx;
+
+	sc = ifp->if_softc;
+
+	if (sc->xl_autoneg) {
+		sc->xl_tx_pend = 1;
+		return;
+	}
+
+	/*
+	 * Check for an available queue slot. If there are none,
+	 * punt.
+	 */
+	if (sc->xl_cdata.xl_tx_free == NULL) {
+		ifp->if_flags |= IFF_OACTIVE;
+		return;
+	}
+
+	start_tx = sc->xl_cdata.xl_tx_free;
+
+	while(sc->xl_cdata.xl_tx_free != NULL) {
+		IF_DEQUEUE(&ifp->if_snd, m_head);
+		if (m_head == NULL)
+			break;
+
+		/* Pick a descriptor off the free list. */
+		cur_tx = sc->xl_cdata.xl_tx_free;
+		sc->xl_cdata.xl_tx_free = cur_tx->xl_next;
+
+		cur_tx->xl_next = NULL;
+
+		/* Pack the data into the descriptor. */
+		xl_encap(sc, cur_tx, m_head);
+
+		/* Chain it together. */
+		if (prev != NULL) {
+			prev->xl_next = cur_tx;
+			prev->xl_ptr->xl_next = vtophys(cur_tx->xl_ptr);
+		}
+		prev = cur_tx;
+
+#if NBPFILTER > 0
+		/*
+		 * If there's a BPF listener, bounce a copy of this frame
+		 * to him.
+		 */
+		if (ifp->if_bpf)
+#ifdef __FreeBSD__
+			bpf_mtap(ifp, cur_tx->xl_mbuf);
+#else
+			bpf_mtap(ifp->if_bpf, cur_tx->xl_mbuf);
+#endif
+
+#endif
+	}
+
+	/*
+	 * Place the request for the upload interrupt
+	 * in the last descriptor in the chain. This way, if
+	 * we're chaining several packets at once, we'll only
+	 * get an interupt once for the whole chain rather than
+	 * once for each packet.
+	 */
+	cur_tx->xl_ptr->xl_status |= XL_TXSTAT_DL_INTR;
+
+	/*
+	 * Queue the packets. If the TX channel is clear, update
+	 * the downlist pointer register.
+	 */
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_DOWN_STALL);
+	xl_wait(sc);
+
+	if (CSR_READ_4(sc, XL_DOWNLIST_PTR)) {
+		sc->xl_cdata.xl_tx_tail->xl_next = start_tx;
+		sc->xl_cdata.xl_tx_tail->xl_ptr->xl_next =
+					vtophys(start_tx->xl_ptr);
+		sc->xl_cdata.xl_tx_tail->xl_ptr->xl_status &=
+					~XL_TXSTAT_DL_INTR;
+	} else {
+		sc->xl_cdata.xl_tx_head = start_tx;
+		sc->xl_cdata.xl_tx_tail = cur_tx;
+		CSR_WRITE_4(sc, XL_DOWNLIST_PTR, vtophys(start_tx->xl_ptr));
+	}
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_DOWN_UNSTALL);
+
+	XL_SEL_WIN(7);
+
+	/*
+	 * Set a timeout in case the chip goes out to lunch.
+	 */
+	ifp->if_timer = 5;
+
+	/*
+	 * XXX Under certain conditions, usually on slower machines
+	 * where interrupts may be dropped, it's possible for the
+	 * adapter to chew up all the buffers in the receive ring
+	 * and stall, without us being able to do anything about it.
+	 * To guard against this, we need to make a pass over the
+	 * RX queue to make sure there aren't any packets pending.
+	 * Doing it here means we can flush the receive ring at the
+	 * same time the chip is DMAing the transmit descriptors we
+	 * just gave it.
+ 	 *
+	 * 3Com goes to some lengths to emphasize the Parallel Tasking (tm)
+	 * nature of their chips in all their marketing literature;
+	 * we may as well take advantage of it. :)
+	 */
+	xl_rxeof(sc);
+
+	return;
+}
+
+static void xl_init(xsc)
+	void			*xsc;
+{
+	struct xl_softc		*sc = xsc;
+	struct ifnet		*ifp = &sc->arpcom.ac_if;
+	int			s, i;
+	u_int16_t		rxfilt = 0;
+	u_int16_t		phy_bmcr = 0;
+
+	if (sc->xl_autoneg)
+		return;
+
+	s = splimp();
+
+	/*
+	 * XXX Hack for the 3c905B: the built-in autoneg logic's state
+	 * gets reset by xl_init() when we don't want it to. Try
+	 * to preserve it. (For 3c905 cards with real external PHYs,
+	 * the BMCR register doesn't change, but this doesn't hurt.)
+	 */
+	if (sc->xl_pinfo != NULL)
+		phy_bmcr = xl_phy_readreg(sc, PHY_BMCR);
+
+	/*
+	 * Cancel pending I/O and free all RX/TX buffers.
+	 */
+	xl_stop(sc);
+
+	xl_wait(sc);
+
+	/* Init our MAC address */
+	XL_SEL_WIN(2);
+	for (i = 0; i < ETHER_ADDR_LEN; i++) {
+		CSR_WRITE_1(sc, XL_W2_STATION_ADDR_LO + i,
+				sc->arpcom.ac_enaddr[i]);
+	}
+
+	/* Clear the station mask. */
+	for (i = 0; i < 3; i++)
+		CSR_WRITE_2(sc, XL_W2_STATION_MASK_LO + (i * 2), 0);
+
+	/* Reset TX and RX. */
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_RESET);
+	xl_wait(sc);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_TX_RESET);
+	xl_wait(sc);
+
+	/* Init circular RX list. */
+	if (xl_list_rx_init(sc)) {
+		printf("xl%d: failed to set up rx lists\n", sc->xl_unit);
+		return;
+	}
+
+	/* Init TX descriptors. */
+	xl_list_tx_init(sc);
+
+	/*
+	 * Set the TX freethresh value.
+	 * Note that this has no effect on 3c905B "cyclone"
+	 * cards but is required for 3c900/3c905 "boomerang"
+	 * cards in order to enable the download engine.
+	 */
+	CSR_WRITE_1(sc, XL_TX_FREETHRESH, XL_PACKET_SIZE >> 8);
+
+	/* Set RX filter bits. */
+	XL_SEL_WIN(5);
+	rxfilt = CSR_READ_1(sc, XL_W5_RX_FILTER);
+
+	/* Set the individual bit to receive frames for this host only. */
+	rxfilt |= XL_RXFILTER_INDIVIDUAL;
+
+	/* If we want promiscuous mode, set the allframes bit. */
+	if (ifp->if_flags & IFF_PROMISC) {
+		rxfilt |= XL_RXFILTER_ALLFRAMES;
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_SET_FILT|rxfilt);
+	} else {
+		rxfilt &= ~XL_RXFILTER_ALLFRAMES;
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_SET_FILT|rxfilt);
+	}
+
+	/*
+	 * Set capture broadcast bit to capture broadcast frames.
+	 */
+	if (ifp->if_flags & IFF_BROADCAST) {
+		rxfilt |= XL_RXFILTER_BROADCAST;
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_SET_FILT|rxfilt);
+	} else {
+		rxfilt &= ~XL_RXFILTER_BROADCAST;
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_SET_FILT|rxfilt);
+	}
+
+	/*
+	 * Program the multicast filter, if necessary.
+	 */
+	if (sc->xl_type == XL_TYPE_905B)
+		xl_setmulti_hash(sc);
+	else
+		xl_setmulti(sc);
+
+	/*
+	 * Load the address of the RX list. We have to
+	 * stall the upload engine before we can manipulate
+	 * the uplist pointer register, then unstall it when
+	 * we're finished. We also have to wait for the
+	 * stall command to complete before proceeding.
+	 * Note that we have to do this after any RX resets
+	 * have completed since the uplist register is cleared
+	 * by a reset.
+	 */
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_UP_STALL);
+	xl_wait(sc);
+	CSR_WRITE_4(sc, XL_UPLIST_PTR, vtophys(&sc->xl_ldata->xl_rx_list[0]));
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_UP_UNSTALL);
+
+	/*
+	 * If the coax transceiver is on, make sure to enable
+	 * the DC-DC converter.
+ 	 */
+	XL_SEL_WIN(3);
+	if (sc->xl_xcvr == XL_XCVR_COAX)
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_COAX_START);
+	else
+		CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_COAX_STOP);
+
+	/* Clear out the stats counters. */
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_STATS_DISABLE);
+	sc->xl_stats_no_timeout = 1;
+	xl_stats_update(sc);
+	sc->xl_stats_no_timeout = 0;
+	XL_SEL_WIN(4);
+	CSR_WRITE_2(sc, XL_W4_NET_DIAG, XL_NETDIAG_UPPER_BYTES_ENABLE);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_STATS_ENABLE);
+
+	/*
+	 * Enable interrupts.
+	 */
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_INTR_ACK|0xFF);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_STAT_ENB|XL_INTRS);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_INTR_ENB|XL_INTRS);
+
+	/* Set the RX early threshold */
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_SET_THRESH|(XL_PACKET_SIZE >>2));
+	CSR_WRITE_2(sc, XL_DMACTL, XL_DMACTL_UP_RX_EARLY);
+
+	/* Enable receiver and transmitter. */
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_ENABLE);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_TX_ENABLE);
+
+	/* Restore state of BMCR */
+	if (sc->xl_pinfo != NULL)
+		xl_phy_writereg(sc, PHY_BMCR, phy_bmcr);
+
+	/* Select window 7 for normal operations. */
+	XL_SEL_WIN(7);
+
+	ifp->if_flags |= IFF_RUNNING;
+	ifp->if_flags &= ~IFF_OACTIVE;
+
+	(void)splx(s);
+
+#ifdef __FreeBSD__
+	sc->xl_stat_ch = timeout(xl_stats_update, sc, hz);
+#else
+	timeout(xl_stats_update, sc, hz);
+#endif
+
+	return;
+}
+
+#ifdef __FreeBSD__
+/*
+ * Set media options.
+ */
+static int xl_ifmedia_upd(ifp)
+	struct ifnet		*ifp;
+{
+	struct xl_softc		*sc;
+	struct ifmedia		*ifm;
+
+	sc = ifp->if_softc;
+	ifm = &sc->ifmedia;
+
+	if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
+		return(EINVAL);
+
+	if (sc->xl_media & XL_MEDIAOPT_MII || sc->xl_media & XL_MEDIAOPT_BTX
+		|| sc->xl_media & XL_MEDIAOPT_BT4) {
+		if (IFM_SUBTYPE(ifm->ifm_media) == IFM_AUTO)
+			xl_autoneg_mii(sc, XL_FLAG_SCHEDDELAY, 1);
+		else
+			xl_setmode_mii(sc, ifm->ifm_media);
+	} else {
+		xl_setmode(sc, ifm->ifm_media);
+	}
+
+	return(0);
+}
+
+/*
+ * Report current media status.
+ */
+static void xl_ifmedia_sts(ifp, ifmr)
+	struct ifnet		*ifp;
+	struct ifmediareq	*ifmr;
+{
+	struct xl_softc		*sc;
+	u_int16_t		advert = 0, ability = 0;
+	u_int32_t		icfg;
+
+	sc = ifp->if_softc;
+
+	XL_SEL_WIN(3);
+	icfg = CSR_READ_4(sc, XL_W3_INTERNAL_CFG) & XL_ICFG_CONNECTOR_MASK;
+	icfg >>= XL_ICFG_CONNECTOR_BITS;
+
+	ifmr->ifm_active = IFM_ETHER;
+
+	switch(icfg) {
+	case XL_XCVR_10BT:
+		ifmr->ifm_active = IFM_ETHER|IFM_10_T;
+		if (CSR_READ_1(sc, XL_W3_MAC_CTRL) & XL_MACCTRL_DUPLEX)
+			ifmr->ifm_active |= IFM_FDX;
+		else
+			ifmr->ifm_active |= IFM_HDX;
+		break;
+	case XL_XCVR_AUI:
+		ifmr->ifm_active = IFM_ETHER|IFM_10_5;
+		break;
+	case XL_XCVR_COAX:
+		ifmr->ifm_active = IFM_ETHER|IFM_10_2;
+		break;
+	/*
+	 * XXX MII and BTX/AUTO should be separate cases.
+	 */
+
+	case XL_XCVR_100BTX:
+	case XL_XCVR_AUTO:
+	case XL_XCVR_MII:
+		if (!(xl_phy_readreg(sc, PHY_BMCR) & PHY_BMCR_AUTONEGENBL)) {
+			if (xl_phy_readreg(sc, PHY_BMCR) & PHY_BMCR_SPEEDSEL)
+				ifmr->ifm_active = IFM_ETHER|IFM_100_TX;
+			else
+				ifmr->ifm_active = IFM_ETHER|IFM_10_T;
+			XL_SEL_WIN(3);
+			if (CSR_READ_2(sc, XL_W3_MAC_CTRL) &
+						XL_MACCTRL_DUPLEX)
+				ifmr->ifm_active |= IFM_FDX;
+			else
+				ifmr->ifm_active |= IFM_HDX;
+			break;
+		}
+		ability = xl_phy_readreg(sc, XL_PHY_LPAR);
+		advert = xl_phy_readreg(sc, XL_PHY_ANAR);
+		if (advert & PHY_ANAR_100BT4 &&
+			ability & PHY_ANAR_100BT4) {
+			ifmr->ifm_active = IFM_ETHER|IFM_100_T4;
+		} else if (advert & PHY_ANAR_100BTXFULL &&
+			ability & PHY_ANAR_100BTXFULL) {
+			ifmr->ifm_active = IFM_ETHER|IFM_100_TX|IFM_FDX;
+		} else if (advert & PHY_ANAR_100BTXHALF &&
+			ability & PHY_ANAR_100BTXHALF) {
+			ifmr->ifm_active = IFM_ETHER|IFM_100_TX|IFM_HDX;
+		} else if (advert & PHY_ANAR_10BTFULL &&
+			ability & PHY_ANAR_10BTFULL) {
+			ifmr->ifm_active = IFM_ETHER|IFM_10_T|IFM_FDX;
+		} else if (advert & PHY_ANAR_10BTHALF &&
+			ability & PHY_ANAR_10BTHALF) {
+			ifmr->ifm_active = IFM_ETHER|IFM_10_T|IFM_HDX;
+		}
+		break;
+	case XL_XCVR_100BFX:
+		ifmr->ifm_active = IFM_ETHER|IFM_100_FX;
+		break;
+	default:
+		printf("xl%d: unknown XCVR type: %d\n", sc->xl_unit, icfg);
+		break;
+	}
+
+	return;
+}
+#endif
+
+static int xl_ioctl(ifp, command, data)
+	struct ifnet		*ifp;
+	u_long			command;
+	caddr_t			data;
+{
+	struct xl_softc		*sc = ifp->if_softc;
+#if defined(__FreeBSD__)
+	struct ifreq		*ifr = (struct ifreq *) data;
+#else
+	struct ifaddr *ifa = (struct ifaddr *)data;
+#endif
+	int			s, error = 0;
+
+	s = splimp();
+
+#ifdef __OpenBSD__
+	if ((error = ether_ioctl(ifp, &sc->arpcom, command, data)) > 0) {
+		splx(s);
+		return error;
+	}
+#endif
+
+	switch(command) {
+#ifdef __FreeBSD__
+	case SIOCSIFADDR:
+	case SIOCGIFADDR:
+	case SIOCSIFMTU:
+		error = ether_ioctl(ifp, command, data);
+		break;
+#else
+	case SIOCSIFADDR:
+		ifp->if_flags |= IFF_UP;
+		switch (ifa->ifa_addr->sa_family) {
+#ifdef INET
+		case AF_INET:
+			xl_init(sc);
+			arp_ifinit(&sc->arpcom, ifa);
+			break;
+#endif /* INET */
+		default:
+			xl_init(sc);
+			break;
+		}
+		break;
+#endif
+	case SIOCSIFFLAGS:
+		if (ifp->if_flags & IFF_UP) {
+			xl_init(sc);
+		} else {
+			if (ifp->if_flags & IFF_RUNNING)
+				xl_stop(sc);
+		}
+		error = 0;
+		break;
+	case SIOCADDMULTI:
+	case SIOCDELMULTI:
+		if (sc->xl_type == XL_TYPE_905B)
+			xl_setmulti_hash(sc);
+		else
+			xl_setmulti(sc);
+		error = 0;
+		break;
+#ifdef __FreeBSD__
+	case SIOCGIFMEDIA:
+	case SIOCSIFMEDIA:
+		error = ifmedia_ioctl(ifp, ifr, &sc->ifmedia, command);
+		break;
+#endif
+	default:
+		error = EINVAL;
+		break;
+	}
+
+	(void)splx(s);
+
+	return(error);
+}
+
+static void xl_watchdog(ifp)
+	struct ifnet		*ifp;
+{
+	struct xl_softc		*sc;
+	u_int16_t		status = 0;
+
+	sc = ifp->if_softc;
+
+	if (sc->xl_autoneg) {
+		xl_autoneg_mii(sc, XL_FLAG_DELAYTIMEO, 1);
+		return;
+	}
+
+	ifp->if_oerrors++;
+	XL_SEL_WIN(4);
+	status = CSR_READ_2(sc, XL_W4_MEDIA_STATUS);
+	printf("xl%d: watchdog timeout\n", sc->xl_unit);
+
+	if (status & XL_MEDIASTAT_CARRIER)
+		printf("xl%d: no carrier - transceiver cable problem?\n",
+								sc->xl_unit);
+	xl_txeoc(sc);
+
+	return;
+}
+
+/*
+ * Stop the adapter and free any mbufs allocated to the
+ * RX and TX lists.
+ */
+static void xl_stop(sc)
+	struct xl_softc		*sc;
+{
+	register int		i;
+	struct ifnet		*ifp;
+
+	ifp = &sc->arpcom.ac_if;
+	ifp->if_timer = 0;
+
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_DISABLE);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_STATS_DISABLE);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_INTR_ENB);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_DISCARD);
+	xl_wait(sc);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_TX_DISABLE);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_COAX_STOP);
+	DELAY(800);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_RX_RESET);
+	xl_wait(sc);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_TX_RESET);
+	xl_wait(sc);
+	CSR_WRITE_2(sc, XL_COMMAND, XL_CMD_INTR_ACK|XL_STAT_INTLATCH);
+
+	/* Stop the stats updater. */
+#ifdef __FreeBSD__
+	untimeout(xl_stats_update, sc, sc->xl_stat_ch);
+#else
+	untimeout(xl_stats_update, sc);
+#endif
+
+	/*
+	 * Free data in the RX lists.
+	 */
+	for (i = 0; i < XL_RX_LIST_CNT; i++) {
+		if (sc->xl_cdata.xl_rx_chain[i].xl_mbuf != NULL) {
+			m_freem(sc->xl_cdata.xl_rx_chain[i].xl_mbuf);
+			sc->xl_cdata.xl_rx_chain[i].xl_mbuf = NULL;
+		}
+	}
+	bzero((char *)&sc->xl_ldata->xl_rx_list,
+		sizeof(sc->xl_ldata->xl_rx_list));
+	/*
+	 * Free the TX list buffers.
+	 */
+	for (i = 0; i < XL_TX_LIST_CNT; i++) {
+		if (sc->xl_cdata.xl_tx_chain[i].xl_mbuf != NULL) {
+			m_freem(sc->xl_cdata.xl_tx_chain[i].xl_mbuf);
+			sc->xl_cdata.xl_tx_chain[i].xl_mbuf = NULL;
+		}
+	}
+	bzero((char *)&sc->xl_ldata->xl_tx_list,
+		sizeof(sc->xl_ldata->xl_tx_list));
+
+	ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
+
+	return;
+}
+
+#ifdef __FreeBSD__
+/*
+ * Stop all chip I/O so that the kernel's probe routines don't
+ * get confused by errant DMAs when rebooting.
+ */
+static void xl_shutdown(howto, arg)
+	int			howto;
+	void			*arg;
+{
+	struct xl_softc		*sc = (struct xl_softc *)arg;
+
+	xl_stop(sc);
+
+	return;
+}
+
+static struct pci_device xl_device = {
+	"xl",
+	xl_probe,
+	xl_attach,
+	&xl_count,
+	NULL
+};
+DATA_SET(pcidevice_set, xl_device);
+#endif
+
+#ifdef __OpenBSD__
+static int
+xl_probe(parent, match, aux)
+	struct device *parent;
+	void *match;
+	void *aux;
+{
+	struct pci_attach_args *pa = (struct pci_attach_args *) aux;
+
+	if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_3COM)
+		return (0);
+
+	switch (PCI_PRODUCT(pa->pa_id)) {
+	    case PCI_PRODUCT_3COM_3C900TPO:
+	    case PCI_PRODUCT_3COM_3C900COMBO:
+	    case PCI_PRODUCT_3COM_3C905TX:
+	    case PCI_PRODUCT_3COM_3C905T4:
+	    case PCI_PRODUCT_3COM_3C905BTX:
+	    case PCI_PRODUCT_3COM_3C905BT4:
+		return (1);
+	}
+					
+	return (0);
+}
+
+static void
+xl_attach(parent, self, aux)
+	struct device *parent, *self;
+	void *aux;
+{
+	struct xl_softc *sc = (struct xl_softc *)self;
+	struct pci_attach_args *pa = aux;
+	pci_chipset_tag_t pc = pa->pa_pc;
+	pci_intr_handle_t ih;
+	const char *intrstr = NULL;
+	u_int8_t enaddr[ETHER_ADDR_LEN];
+	struct ifnet *ifp = &sc->arpcom.ac_if;
+	bus_space_tag_t iot = pa->pa_iot;
+	bus_addr_t iobase;
+	bus_size_t iosize;
+	u_int32_t command;
+	u_int16_t phy_sts;
+	caddr_t roundptr;
+	u_int round;
+	int i;
+
+	sc->xl_unit = sc->sc_dev.dv_unit;
+
+	command = pci_conf_read(pa->pa_pc, pa->pa_tag, XL_PCI_CAPID) & 0xff;
+	if (command == 0x01) {
+
+		command = pci_conf_read(pa->pa_pc, pa->pa_tag,
+		    XL_PCI_PWRMGMTCTRL);
+		if (command & XL_PSTATE_MASK) {
+			/* Reset the power state. */
+			printf("%s: chip is is in D%d power mode "
+			    "-- setting to D0\n",
+			    sc->sc_dev.dv_xname, command & XL_PSTATE_MASK);
+			command &= 0xFFFFFFFC;
+			pci_conf_write(pa->pa_pc, pa->pa_tag,
+			    XL_PCI_PWRMGMTCTRL, command);
+		}
+	}
+
+	/*
+	 * Map control/status registers.
+	 */
+	command = pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
+	command |= PCI_COMMAND_IO_ENABLE |
+		   PCI_COMMAND_MEM_ENABLE |
+		   PCI_COMMAND_MASTER_ENABLE;
+	pci_conf_write(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG, command);
+	command = pci_conf_read(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
+
+	if (!(command & PCI_COMMAND_IO_ENABLE)) {
+		printf("%s: failed to enable i/o ports\n",
+		    sc->sc_dev.dv_xname);
+		return;
+	}
+
+	/*
+	 * Map control/status registers.
+	 */
+	if (pci_io_find(pc, pa->pa_tag, XL_PCI_LOIO, &iobase, &iosize)) {
+		printf(": can't find i/o space\n");
+		return;
+	}
+	if (bus_space_map(iot, iobase, iosize, 0, &sc->sc_sh)) {
+		printf(": can't map i/o space\n");
+		return;
+	}
+	sc->sc_st = iot;
+
+	/*
+	 * Allocate our interrupt.
+	 */
+	if (pci_intr_map(pc, pa->pa_intrtag, pa->pa_intrpin,
+	    pa->pa_intrline, &ih)) {
+		printf(": couldn't map interrupt\n");
+		return;
+	}
+
+	intrstr = pci_intr_string(pc, ih);
+	sc->sc_ih = pci_intr_establish(pc, ih, IPL_NET, xl_intr, sc,
+	    self->dv_xname);
+	if (sc->sc_ih == NULL) {
+		printf(": couldn't establish interrupt");
+		if (intrstr != NULL)
+			printf(" at %s", intrstr);
+		printf("\n");
+		return;
+	}
+
+	bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);
+	ifp->if_softc = sc;
+	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
+	ifp->if_ioctl = xl_ioctl;
+	ifp->if_start = xl_start;
+	ifp->if_watchdog = xl_watchdog;
+
+	printf(": %s\n", intrstr);
+
+	if_attach(ifp);
+	ether_ifattach(ifp);
+#if NBPFILTER > 0
+	bpfattach(&sc->arpcom.ac_if.if_bpf, ifp, DLT_EN10MB,
+		sizeof(struct ether_header));
+#endif
+	shutdownhook_establish(xl_shutdown, sc);
+
+	xl_reset(sc);
+
+	if (xl_read_eeprom(sc, (caddr_t)&enaddr, XL_EE_OEM_ADR0, 3, 1)) {
+		printf("%s: failed to read station address\n",
+		    sc->sc_dev.dv_xname);
+		return;
+	}
+	bcopy(enaddr, (char *)&sc->arpcom.ac_enaddr, ETHER_ADDR_LEN);
+
+	printf("%s: address %s\n", sc->sc_dev.dv_xname,
+	    ether_sprintf(sc->arpcom.ac_enaddr));
+
+	sc->xl_ldata_ptr = malloc(sizeof(struct xl_list_data) + 8,
+	    M_DEVBUF, M_NOWAIT);
+	if (sc->xl_ldata_ptr == NULL) {
+		printf("%s: no memory for list buffers\n",sc->sc_dev.dv_xname);
+		return;
+	}
+
+	sc->xl_ldata = (struct xl_list_data *)sc->xl_ldata_ptr;
+	round = (u_int32_t)sc->xl_ldata_ptr & 0xf;
+	roundptr = sc->xl_ldata_ptr;
+	for (i = 0; i < 8; i++) {
+		if (round % 8) {
+			round++;
+			roundptr++;
+		}
+		break;
+	}
+	sc->xl_ldata = (struct xl_list_data *)roundptr;
+	bzero(sc->xl_ldata, sizeof(struct xl_list_data));
+
+	xl_read_eeprom(sc, (caddr_t)&sc->xl_caps, XL_EE_CAPS, 1, 0);
+	if (sc->xl_caps & XL_CAPS_NO_TXLENGTH)
+		sc->xl_type = XL_TYPE_905B;
+	else
+		sc->xl_type = XL_TYPE_90X;
+
+	XL_SEL_WIN(3);
+	sc->xl_media = CSR_READ_2(sc, XL_W3_MEDIA_OPT);
+	xl_mediacheck(sc);
+
+	xl_read_eeprom(sc, (char *)&sc->xl_xcvr, XL_EE_ICFG_0, 2, 0);
+	sc->xl_xcvr &= XL_ICFG_CONNECTOR_MASK;
+	sc->xl_xcvr >>= XL_ICFG_CONNECTOR_BITS;
+	if (sc->xl_media & XL_MEDIAOPT_MII || sc->xl_media & XL_MEDIAOPT_BTX
+			|| sc->xl_media & XL_MEDIAOPT_BT4) {
+		/*
+		 * In theory I shouldn't need this, but... if this
+		 * card supports an MII, either an external one or
+		 * an internal fake one, select it in the internal
+		 * config register before trying to probe it.
+		 */
+		u_int32_t		icfg;
+
+		XL_SEL_WIN(3);
+		icfg = CSR_READ_4(sc, XL_W3_INTERNAL_CFG);
+		icfg &= ~XL_ICFG_CONNECTOR_MASK;
+		if (sc->xl_media & XL_MEDIAOPT_MII ||
+			sc->xl_media & XL_MEDIAOPT_BT4)
+			icfg |= (XL_XCVR_MII << XL_ICFG_CONNECTOR_BITS);
+		if (sc->xl_media & XL_MEDIAOPT_BTX)
+			icfg |= (XL_XCVR_AUTO << XL_ICFG_CONNECTOR_BITS);
+		if (sc->xl_media & XL_MEDIAOPT_BFX)
+			icfg |= (XL_XCVR_100BFX << XL_ICFG_CONNECTOR_BITS);
+		CSR_WRITE_4(sc, XL_W3_INTERNAL_CFG, icfg);
+
+		for (i = XL_PHYADDR_MIN; i < XL_PHYADDR_MAX + 1; i++) {
+			sc->xl_phy_addr = i;
+			xl_phy_writereg(sc, XL_PHY_GENCTL, PHY_BMCR_RESET);
+			DELAY(500);
+			while(xl_phy_readreg(sc, XL_PHY_GENCTL)
+					& PHY_BMCR_RESET);
+			if ((phy_sts = xl_phy_readreg(sc, XL_PHY_GENSTS)))
+				break;
+		}
+		if (!phy_sts) {
+			printf("%s: MII without any phy!\n",
+			    sc->sc_dev.dv_xname);
+		}
+	}
+
+	if (sc->xl_xcvr == XL_XCVR_AUTO || sc->xl_xcvr == XL_XCVR_MII)
+		xl_autoneg_mii(sc, XL_FLAG_SCHEDDELAY, 1);
+}
+
+static void
+xl_shutdown(v)
+	void *v;
+{
+	struct xl_softc	*sc = (struct xl_softc *)v;
+
+	xl_stop(sc);
+}
+
+struct cfattach xl_ca = {
+	sizeof(struct xl_softc), xl_probe, xl_attach,
+};
+      
+struct cfdriver xl_cd = {
+	0, "xl", DV_IFNET
+};
+
+#endif