DEC/Intel 21143 and "tulip" clone Ethernet driver. Intended to replace the

individual ax, al, pn, and mx drivers. It also supports the Davicom DM9100
and DM9102 chipsets (dm) which we previously did not have. From FreeBSD.

4 files changed, 3557 insertions, 2 deletions

diff --git a/sys/arch/i386/conf/GENERIC b/sys/arch/i386/conf/GENERIC
index 5b00547f8b0..8e055a853ae 100644
--- a/sys/arch/i386/conf/GENERIC
+++ b/sys/arch/i386/conf/GENERIC
@@ -1,4 +1,4 @@
-#	$OpenBSD: GENERIC,v 1.146 1999/12/07 01:45:29 aaron Exp $
+#	$OpenBSD: GENERIC,v 1.147 1999/12/08 22:35:35 aaron Exp $
 #	$NetBSD: GENERIC,v 1.48 1996/05/20 18:17:23 mrg Exp $
 #
 #	GENERIC -- everything that's currently supported
@@ -252,6 +252,7 @@ al*	at pci?	dev ? function ?		# ADMtek AL981/AN985 ethernet
 sf*	at pci? dev ? function ?		# Adaptec AIC-6915 ethernet
 sis*	at pci? dev ? function ?		# SiS 900/7016 ethernet
 ste*	at pci? dev ? function ?		# Sundance ST201 ethernet
+#dc*	at pci? dev ? function ?		# 21143, "tulip" clone ethernet
 skc*	at pci? dev ? function ?		# SysKonnect GEnesis 984x
 sk*	at skc?					#  each port of above
 
diff --git a/sys/dev/pci/files.pci b/sys/dev/pci/files.pci
index 4aa89553954..a6d67f3ed3c 100644
--- a/sys/dev/pci/files.pci
+++ b/sys/dev/pci/files.pci
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.pci,v 1.58 1999/12/07 01:45:29 aaron Exp $
+#	$OpenBSD: files.pci,v 1.59 1999/12/08 22:35:34 aaron Exp $
 #	$NetBSD: files.pci,v 1.20 1996/09/24 17:47:15 christos Exp $
 #
 # Config file and device description for machine-independent PCI code.
@@ -213,6 +213,11 @@ device	ste: ether, ifnet, mii, ifmedia
 attach	ste at pci
 file	dev/pci/if_ste.c		ste
 
+# DEC/Intel 21143 and "tulip" clone ethernet
+#device	dc: ether, ifnet, mii, ifmedia
+#attach	dc at pci
+#file	dev/pci/if_dc.c			dc
+
 # Industrial Computer Source WDT-50x
 device	wdt: pcibus
 attach	wdt at pci
diff --git a/sys/dev/pci/if_dc.c b/sys/dev/pci/if_dc.c
new file mode 100644
index 00000000000..d2f26f85ce5
--- /dev/null
+++ b/sys/dev/pci/if_dc.c
@@ -0,0 +1,2638 @@
+/*
+ * Copyright (c) 1997, 1998, 1999
+ *	Bill Paul <wpaul@ee.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.
+ *
+ * $FreeBSD: src/sys/pci/if_dc.c,v 1.2 1999/12/07 19:18:41 wpaul Exp $
+ */
+
+/*
+ * DEC "tulip" clone ethernet driver. Supports the DEC/Intel 21143
+ * series chips and several workalikes including the following:
+ *
+ * Macronix 98713/98715/98725 PMAC (www.macronix.com)
+ * Macronix/Lite-On 82c115 PNIC II (www.macronix.com)
+ * Lite-On 82c168/82c169 PNIC (www.litecom.com)
+ * ASIX Electronics AX88140A (www.asix.com.tw)
+ * ASIX Electronics AX88141 (www.asix.com.tw)
+ * ADMtek AL981 (www.admtek.com.tw)
+ * ADMtek AN985 (www.admtek.com.tw)
+ * Davicom DM9100, DM9102 (www.davicom8.com)
+ *
+ * Datasheets for the 21143 are available at developer.intel.com.
+ * Datasheets for the clone parts can be found at their respective sites.
+ * (Except for the PNIC; see www.freebsd.org/~wpaul/PNIC/pnic.ps.gz.)
+ * The PNIC II is essentially a Macronix 98715A chip; the only difference
+ * worth noting is that its multicast hash table is only 128 bits wide
+ * instead of 512.
+ *
+ * Written by Bill Paul <wpaul@ee.columbia.edu>
+ * Electrical Engineering Department
+ * Columbia University, New York City
+ */
+
+/*
+ * The Intel 21143 is the successor to the DEC 21140. It is basically
+ * the same as the 21140 but with a few new features. The 21143 supports
+ * three kinds of media attachments:
+ *
+ * o MII port, for 10Mbps and 100Mbps support and NWAY
+ *   autonegotiation provided by an external PHY.
+ * o SYM port, for symbol mode 100Mbps support.
+ * o 10baseT port.
+ * o AUI/BNC port.
+ *
+ * The 100Mbps SYM port and 10baseT port can be used together in
+ * combination with the internal NWAY support to create a 10/100
+ * autosensing configuration.
+ *
+ * Knowing which media is available on a given card is tough: you're
+ * supposed to go slogging through the EEPROM looking for media
+ * description structures. Unfortunately, some card vendors that use
+ * the 21143 don't obey the DEC SROM spec correctly, which means that
+ * what you find in the EEPROM may not agree with reality. Fortunately,
+ * the 21143 provides us a way to get around this issue: lurking in
+ * PCI configuration space is the Configuration Wake-Up Command Register.
+ * This register is loaded with a value from the EEPROM when wake on LAN
+ * mode is enabled; this value tells us quite clearly what kind of media
+ * is attached to the NIC. The main purpose of this register is to tell
+ * the NIC what media to scan when in wake on LAN mode, however by
+ * forcibly enabling wake on LAN mode, we can use to learn what kind of
+ * media a given NIC has available and adapt ourselves accordingly.
+ *
+ * Of course, if the media description blocks in the EEPROM are bogus.
+ * what are the odds that the CWUC aren't bogus as well, right? Well,
+ * the CWUC value is more likely to be correct since wake on LAN mode
+ * won't work correctly without it, and wake on LAN is a big selling
+ * point these days. It's also harder to screw up a single byte than
+ * a whole media descriptor block.
+ *
+ * Note that not all tulip workalikes are handled in this driver: we only
+ * deal with those which are relatively well behaved. The Winbond is
+ * handled separately due to its different register offsets and the
+ * special handling needed for its various bugs. The PNIC is handled
+ * here, but I'm not thrilled about it.
+ *
+ * All of the workalike chips use some form of MII transceiver support
+ * with the exception of the Macronix chips, which also have a SYM port.
+ * The ASIX AX88140A is also documented to have a SYM port, but all
+ * the cards I've seen use an MII transceiver, probably because the
+ * AX88140A doesn't support internal NWAY.
+ */
+
+#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 <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 <net/if_media.h>
+
+#if NBPFILTER > 0
+#include <net/bpf.h>
+#endif
+
+#include <vm/vm.h>              /* for vtophys */
+#include <vm/pmap.h>            /* for vtophys */
+
+#include <sys/device.h>
+
+#include <dev/mii/mii.h>
+#include <dev/mii/miivar.h>
+
+#include <dev/pci/pcireg.h>
+#include <dev/pci/pcivar.h>
+#include <dev/pci/pcidevs.h>
+
+#define DC_USEIOSPACE
+
+#include <dev/pci/if_dcreg.h>
+
+/*
+ * Various supported device vendors/types and their names.
+ */
+struct dc_type dc_devs[] = {
+	{ DC_VENDORID_DEC, DC_DEVICEID_21143,
+		"Intel 21143 10/100BaseTX" },
+	{ DC_VENDORID_DAVICOM, DC_DEVICEID_DM9100,
+		"Davicom DM9100 10/100BaseTX" },
+	{ DC_VENDORID_DAVICOM, DC_DEVICEID_DM9102,
+		"Davicom DM9102 10/100BaseTX" },
+	{ DC_VENDORID_ADMTEK, DC_DEVICEID_AL981,
+		"ADMtek AL981 10/100BaseTX" },
+	{ DC_VENDORID_ADMTEK, DC_DEVICEID_AN985,
+		"ADMtek AN985 10/100BaseTX" },
+	{ DC_VENDORID_ASIX, DC_DEVICEID_AX88140A,
+		"ASIX AX88140A 10/100BaseTX" },
+	{ DC_VENDORID_ASIX, DC_DEVICEID_AX88140A,
+		"ASIX AX88141 10/100BaseTX" },
+	{ DC_VENDORID_MX, DC_DEVICEID_98713,
+		"Macronix 98713 10/100BaseTX" },
+	{ DC_VENDORID_MX, DC_DEVICEID_98713,
+		"Macronix 98713A 10/100BaseTX" },
+	{ DC_VENDORID_CP, DC_DEVICEID_98713_CP,
+		"Compex RL100-TX 10/100BaseTX" },
+	{ DC_VENDORID_CP, DC_DEVICEID_98713_CP,
+		"Compex RL100-TX 10/100BaseTX" },
+	{ DC_VENDORID_MX, DC_DEVICEID_987x5,
+		"Macronix 98715/98715A 10/100BaseTX" },
+	{ DC_VENDORID_MX, DC_DEVICEID_987x5,
+		"Macronix 98725 10/100BaseTX" },
+	{ DC_VENDORID_LO, DC_DEVICEID_82C115,
+		"LC82C115 PNIC II 10/100BaseTX" },
+	{ DC_VENDORID_LO, DC_DEVICEID_82C168,
+		"82c168 PNIC 10/100BaseTX" },
+	{ DC_VENDORID_LO, DC_DEVICEID_82C168,
+		"82c169 PNIC 10/100BaseTX" },
+	{ 0, 0, NULL }
+};
+
+int dc_probe		__P((struct device *, void *, void *));
+void dc_attach		__P((struct device *, struct device *, void *));
+int dc_intr		__P((void *));
+void dc_shutdown	__P((void *));
+void dc_acpi		__P((struct device *, void *));
+struct dc_type *dc_devtype	__P((void *));
+int dc_newbuf		__P((struct dc_softc *, int, struct mbuf *));
+int dc_encap		__P((struct dc_softc *, struct mbuf *, u_int32_t *));
+void dc_pnic_rx_bug_war	__P((struct dc_softc *, int));
+void dc_rxeof		__P((struct dc_softc *));
+void dc_txeof		__P((struct dc_softc *));
+void dc_tick		__P((void *));
+void dc_start		__P((struct ifnet *));
+int dc_ioctl		__P((struct ifnet *, u_long, caddr_t));
+void dc_init		__P((void *));
+void dc_stop		__P((struct dc_softc *));
+void dc_watchdog		__P((struct ifnet *));
+int dc_ifmedia_upd	__P((struct ifnet *));
+void dc_ifmedia_sts	__P((struct ifnet *, struct ifmediareq *));
+
+void dc_delay		__P((struct dc_softc *));
+void dc_eeprom_idle	__P((struct dc_softc *));
+void dc_eeprom_putbyte	__P((struct dc_softc *, int));
+void dc_eeprom_getword	__P((struct dc_softc *, int, u_int16_t *));
+void dc_eeprom_getword_pnic	__P((struct dc_softc *, int, u_int16_t *));
+void dc_read_eeprom	__P((struct dc_softc *, caddr_t, int, int, int));
+
+void dc_mii_writebit	__P((struct dc_softc *, int));
+int dc_mii_readbit	__P((struct dc_softc *));
+void dc_mii_sync	__P((struct dc_softc *));
+void dc_mii_send	__P((struct dc_softc *, u_int32_t, int));
+int dc_mii_readreg	__P((struct dc_softc *, struct dc_mii_frame *));
+int dc_mii_writereg	__P((struct dc_softc *, struct dc_mii_frame *));
+int dc_miibus_readreg	__P((struct device *, int, int));
+void dc_miibus_writereg	__P((struct device *, int, int, int));
+void dc_miibus_statchg	__P((struct device *));
+
+void dc_setcfg		__P((struct dc_softc *, int));
+u_int32_t dc_crc_le	__P((struct dc_softc *, caddr_t));
+u_int32_t dc_crc_be	__P((caddr_t));
+void dc_setfilt_21143	__P((struct dc_softc *));
+void dc_setfilt_asix	__P((struct dc_softc *));
+void dc_setfilt_admtek	__P((struct dc_softc *));
+
+void dc_setfilt		__P((struct dc_softc *));
+
+void dc_reset		__P((struct dc_softc *));
+int dc_list_rx_init	__P((struct dc_softc *));
+int dc_list_tx_init	__P((struct dc_softc *));
+
+#define DC_SETBIT(sc, reg, x)				\
+	CSR_WRITE_4(sc, reg, CSR_READ_4(sc, reg) | (x))
+
+#define DC_CLRBIT(sc, reg, x)				\
+	CSR_WRITE_4(sc, reg, CSR_READ_4(sc, reg) & ~(x))
+
+#define SIO_SET(x)	DC_SETBIT(sc, DC_SIO, (x))
+#define SIO_CLR(x)	DC_CLRBIT(sc, DC_SIO, (x))
+
+void dc_delay(sc)
+	struct dc_softc		*sc;
+{
+	int			idx;
+
+	for (idx = (300 / 33) + 1; idx > 0; idx--)
+		CSR_READ_4(sc, DC_BUSCTL);
+}
+
+void dc_eeprom_idle(sc)
+	struct dc_softc		*sc;
+{
+	register int		i;
+
+	CSR_WRITE_4(sc, DC_SIO, DC_SIO_EESEL);
+	dc_delay(sc);
+	DC_SETBIT(sc, DC_SIO, DC_SIO_ROMCTL_READ);
+	dc_delay(sc);
+	DC_CLRBIT(sc, DC_SIO, DC_SIO_EE_CLK);
+	dc_delay(sc);
+	DC_SETBIT(sc, DC_SIO, DC_SIO_EE_CS);
+	dc_delay(sc);
+
+	for (i = 0; i < 25; i++) {
+		DC_CLRBIT(sc, DC_SIO, DC_SIO_EE_CLK);
+		dc_delay(sc);
+		DC_SETBIT(sc, DC_SIO, DC_SIO_EE_CLK);
+		dc_delay(sc);
+	}
+
+	DC_CLRBIT(sc, DC_SIO, DC_SIO_EE_CLK);
+	dc_delay(sc);
+	DC_CLRBIT(sc, DC_SIO, DC_SIO_EE_CS);
+	dc_delay(sc);
+	CSR_WRITE_4(sc, DC_SIO, 0x00000000);
+
+	return;
+}
+
+/*
+ * Send a read command and address to the EEPROM, check for ACK.
+ */
+void dc_eeprom_putbyte(sc, addr)
+	struct dc_softc		*sc;
+	int			addr;
+{
+	register int		d, i;
+
+	/*
+	 * The AN985 has a 93C66 EEPROM on it instead of
+	 * a 93C46. It uses a different bit sequence for
+	 * specifying the "read" opcode.
+	 */
+	if (DC_IS_CENTAUR(sc))
+		d = addr | (DC_EECMD_READ << 2);
+	else
+		d = addr | DC_EECMD_READ;
+
+	/*
+	 * Feed in each bit and strobe the clock.
+	 */
+	for (i = 0x400; i; i >>= 1) {
+		if (d & i) {
+			SIO_SET(DC_SIO_EE_DATAIN);
+		} else {
+			SIO_CLR(DC_SIO_EE_DATAIN);
+		}
+		dc_delay(sc);
+		SIO_SET(DC_SIO_EE_CLK);
+		dc_delay(sc);
+		SIO_CLR(DC_SIO_EE_CLK);
+		dc_delay(sc);
+	}
+
+	return;
+}
+
+/*
+ * Read a word of data stored in the EEPROM at address 'addr.'
+ * The PNIC 82c168/82c169 has its own non-standard way to read
+ * the EEPROM.
+ */
+void dc_eeprom_getword_pnic(sc, addr, dest)
+	struct dc_softc		*sc;
+	int			addr;
+	u_int16_t		*dest;
+{
+	register int		i;
+	u_int32_t		r;
+
+	CSR_WRITE_4(sc, DC_PN_SIOCTL, DC_PN_EEOPCODE_READ|addr);
+
+	for (i = 0; i < DC_TIMEOUT; i++) {
+		DELAY(1);
+		r = CSR_READ_4(sc, DC_SIO);
+		if (!(r & DC_PN_SIOCTL_BUSY)) {
+			*dest = (u_int16_t)(r & 0xFFFF);
+			return;
+		}
+	}
+
+	return;
+}
+
+/*
+ * Read a word of data stored in the EEPROM at address 'addr.'
+ */
+void dc_eeprom_getword(sc, addr, dest)
+	struct dc_softc		*sc;
+	int			addr;
+	u_int16_t		*dest;
+{
+	register int		i;
+	u_int16_t		word = 0;
+
+	/* Force EEPROM to idle state. */
+	dc_eeprom_idle(sc);
+
+	/* Enter EEPROM access mode. */
+	CSR_WRITE_4(sc, DC_SIO, DC_SIO_EESEL);
+	dc_delay(sc);
+	DC_SETBIT(sc, DC_SIO,  DC_SIO_ROMCTL_READ);
+	dc_delay(sc);
+	DC_CLRBIT(sc, DC_SIO, DC_SIO_EE_CLK);
+	dc_delay(sc);
+	DC_SETBIT(sc, DC_SIO, DC_SIO_EE_CS);
+	dc_delay(sc);
+
+	/*
+	 * Send address of word we want to read.
+	 */
+	dc_eeprom_putbyte(sc, addr);
+
+	/*
+	 * Start reading bits from EEPROM.
+	 */
+	for (i = 0x8000; i; i >>= 1) {
+		SIO_SET(DC_SIO_EE_CLK);
+		dc_delay(sc);
+		if (CSR_READ_4(sc, DC_SIO) & DC_SIO_EE_DATAOUT)
+			word |= i;
+		dc_delay(sc);
+		SIO_CLR(DC_SIO_EE_CLK);
+		dc_delay(sc);
+	}
+
+	/* Turn off EEPROM access mode. */
+	dc_eeprom_idle(sc);
+
+	*dest = word;
+
+	return;
+}
+
+/*
+ * Read a sequence of words from the EEPROM.
+ */
+void dc_read_eeprom(sc, dest, off, cnt, swap)
+	struct dc_softc		*sc;
+	caddr_t			dest;
+	int			off;
+	int			cnt;
+	int			swap;
+{
+	int			i;
+	u_int16_t		word = 0, *ptr;
+
+	for (i = 0; i < cnt; i++) {
+		if (DC_IS_PNIC(sc))
+			dc_eeprom_getword_pnic(sc, off + i, &word);
+		else
+			dc_eeprom_getword(sc, off + i, &word);
+		ptr = (u_int16_t *)(dest + (i * 2));
+		if (swap)
+			*ptr = ntohs(word);
+		else
+			*ptr = word;
+	}
+
+	return;
+}
+
+/*
+ * The following two routines are taken from the Macronix 98713
+ * Application Notes pp.19-21.
+ */
+/*
+ * Write a bit to the MII bus.
+ */
+void dc_mii_writebit(sc, bit)
+	struct dc_softc		*sc;
+	int			bit;
+{
+	if (bit)
+		CSR_WRITE_4(sc, DC_SIO,
+		    DC_SIO_ROMCTL_WRITE|DC_SIO_MII_DATAOUT);
+	else
+		CSR_WRITE_4(sc, DC_SIO, DC_SIO_ROMCTL_WRITE);
+
+	DC_SETBIT(sc, DC_SIO, DC_SIO_MII_CLK);
+	DC_CLRBIT(sc, DC_SIO, DC_SIO_MII_CLK);
+
+	return;
+}
+
+/*
+ * Read a bit from the MII bus.
+ */
+int dc_mii_readbit(sc)
+	struct dc_softc		*sc;
+{
+	CSR_WRITE_4(sc, DC_SIO, DC_SIO_ROMCTL_READ|DC_SIO_MII_DIR);
+	CSR_READ_4(sc, DC_SIO);
+	DC_SETBIT(sc, DC_SIO, DC_SIO_MII_CLK);
+	DC_CLRBIT(sc, DC_SIO, DC_SIO_MII_CLK);
+	if (CSR_READ_4(sc, DC_SIO) & DC_SIO_MII_DATAIN)
+		return(1);
+
+	return(0);
+}
+
+/*
+ * Sync the PHYs by setting data bit and strobing the clock 32 times.
+ */
+void dc_mii_sync(sc)
+	struct dc_softc		*sc;
+{
+	register int		i;
+
+	CSR_WRITE_4(sc, DC_SIO, DC_SIO_ROMCTL_WRITE);
+
+	for (i = 0; i < 32; i++)
+		dc_mii_writebit(sc, 1);
+
+	return;
+}
+
+/*
+ * Clock a series of bits through the MII.
+ */
+void dc_mii_send(sc, bits, cnt)
+	struct dc_softc		*sc;
+	u_int32_t		bits;
+	int			cnt;
+{
+	int			i;
+
+	for (i = (0x1 << (cnt - 1)); i; i >>= 1)
+		dc_mii_writebit(sc, bits & i);
+}
+
+/*
+ * Read an PHY register through the MII.
+ */
+int dc_mii_readreg(sc, frame)
+	struct dc_softc		*sc;
+	struct dc_mii_frame	*frame;
+	
+{
+	int			i, ack, s;
+
+	s = splimp();
+
+	/*
+	 * Set up frame for RX.
+	 */
+	frame->mii_stdelim = DC_MII_STARTDELIM;
+	frame->mii_opcode = DC_MII_READOP;
+	frame->mii_turnaround = 0;
+	frame->mii_data = 0;
+	
+	/*
+	 * Sync the PHYs.
+	 */
+	dc_mii_sync(sc);
+
+	/*
+	 * Send command/address info.
+	 */
+	dc_mii_send(sc, frame->mii_stdelim, 2);
+	dc_mii_send(sc, frame->mii_opcode, 2);
+	dc_mii_send(sc, frame->mii_phyaddr, 5);
+	dc_mii_send(sc, frame->mii_regaddr, 5);
+
+#ifdef notdef
+	/* Idle bit */
+	dc_mii_writebit(sc, 1);
+	dc_mii_writebit(sc, 0);
+#endif
+
+	/* Check for ack */
+	ack = dc_mii_readbit(sc);
+
+	/*
+	 * 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++) {
+			dc_mii_readbit(sc);
+		}
+		goto fail;
+	}
+
+	for (i = 0x8000; i; i >>= 1) {
+		if (!ack) {
+			if (dc_mii_readbit(sc))
+				frame->mii_data |= i;
+		}
+	}
+
+fail:
+
+	dc_mii_writebit(sc, 0);
+	dc_mii_writebit(sc, 0);
+
+	splx(s);
+
+	if (ack)
+		return(1);
+	return(0);
+}
+
+/*
+ * Write to a PHY register through the MII.
+ */
+int dc_mii_writereg(sc, frame)
+	struct dc_softc		*sc;
+	struct dc_mii_frame	*frame;
+	
+{
+	int			s;
+
+	s = splimp();
+	/*
+	 * Set up frame for TX.
+	 */
+
+	frame->mii_stdelim = DC_MII_STARTDELIM;
+	frame->mii_opcode = DC_MII_WRITEOP;
+	frame->mii_turnaround = DC_MII_TURNAROUND;
+
+	/*
+	 * Sync the PHYs.
+	 */	
+	dc_mii_sync(sc);
+
+	dc_mii_send(sc, frame->mii_stdelim, 2);
+	dc_mii_send(sc, frame->mii_opcode, 2);
+	dc_mii_send(sc, frame->mii_phyaddr, 5);
+	dc_mii_send(sc, frame->mii_regaddr, 5);
+	dc_mii_send(sc, frame->mii_turnaround, 2);
+	dc_mii_send(sc, frame->mii_data, 16);
+
+	/* Idle bit. */
+	dc_mii_writebit(sc, 0);
+	dc_mii_writebit(sc, 0);
+
+	splx(s);
+
+	return(0);
+}
+
+int dc_miibus_readreg(self, phy, reg)
+	struct device		*self;
+	int			phy, reg;
+{
+	struct dc_mii_frame	frame;
+	struct dc_softc		*sc = (struct dc_softc *)self;
+	int			i, rval, phy_reg;
+
+	bzero((char *)&frame, sizeof(frame));
+
+	/*
+	 * Note: both the AL981 and AN985 have internal PHYs,
+	 * however the AL981 provides direct access to the PHY
+	 * registers while the AN985 uses a serial MII interface.
+	 * The AN985's MII interface is also buggy in that you
+	 * can read from any MII address (0 to 31), but only address 1
+	 * behaves normally. To deal with both cases, we pretend
+	 * that the PHY is at MII address 1.
+	 */
+	if (DC_IS_ADMTEK(sc) && phy != DC_ADMTEK_PHYADDR)
+		return(0);
+
+	if (sc->dc_pmode == DC_PMODE_SYM) {
+		if (phy == (MII_NPHY - 1)) {
+			switch(reg) {
+			case MII_BMSR:
+			/*
+			 * Fake something to make the probe
+			 * code think there's a PHY here.
+			 */
+				return(BMSR_MEDIAMASK);
+				break;
+			case MII_PHYIDR1:
+				if (DC_IS_PNIC(sc))
+					return(DC_VENDORID_LO);
+				return(DC_VENDORID_DEC);
+				break;
+			case MII_PHYIDR2:
+				if (DC_IS_PNIC(sc))
+					return(DC_DEVICEID_82C168);
+				return(DC_DEVICEID_21143);
+				break;
+			default:
+				return(0);
+				break;
+			}
+		} else
+			return(0);
+	}
+
+	if (DC_IS_PNIC(sc)) {
+		CSR_WRITE_4(sc, DC_PN_MII, DC_PN_MIIOPCODE_READ |
+		    (phy << 23) | (reg << 18));
+		for (i = 0; i < DC_TIMEOUT; i++) {
+			DELAY(1);
+			rval = CSR_READ_4(sc, DC_PN_MII);
+			if (!(rval & DC_PN_MII_BUSY)) {
+				rval &= 0xFFFF;
+				return(rval == 0xFFFF ? 0 : rval);
+			}
+		}
+		return(0);
+	}
+
+	if (DC_IS_COMET(sc)) {
+		switch(reg) {
+		case MII_BMCR:
+			phy_reg = DC_AL_BMCR;
+			break;
+		case MII_BMSR:
+			phy_reg = DC_AL_BMSR;
+			break;
+		case MII_PHYIDR1:
+			phy_reg = DC_AL_VENID;
+			break;
+		case MII_PHYIDR2:
+			phy_reg = DC_AL_DEVID;
+			break;
+		case MII_ANAR:
+			phy_reg = DC_AL_ANAR;
+			break;
+		case MII_ANLPAR:
+			phy_reg = DC_AL_LPAR;
+			break;
+		case MII_ANER:
+			phy_reg = DC_AL_ANER;
+			break;
+		default:
+			printf("dc%d: phy_read: bad phy register %x\n",
+			    sc->dc_unit, reg);
+			return(0);
+			break;
+		}
+
+		rval = CSR_READ_4(sc, phy_reg) & 0x0000FFFF;
+
+		if (rval == 0xFFFF)
+			return(0);
+		return(rval);
+	}
+
+	frame.mii_phyaddr = phy;
+	frame.mii_regaddr = reg;
+	DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_PORTSEL);
+	dc_mii_readreg(sc, &frame);
+	DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_PORTSEL);
+
+	return(frame.mii_data);
+}
+
+void dc_miibus_writereg(self, phy, reg, data)
+	struct device		*self;
+	int			phy, reg, data;
+{
+	struct dc_softc		*sc = (struct dc_softc *)self;
+	struct dc_mii_frame	frame;
+	int			i, phy_reg;
+
+	bzero((char *)&frame, sizeof(frame));
+
+	if (DC_IS_ADMTEK(sc) && phy != DC_ADMTEK_PHYADDR)
+		return;
+
+	if (DC_IS_PNIC(sc)) {
+		CSR_WRITE_4(sc, DC_PN_MII, DC_PN_MIIOPCODE_WRITE |
+		    (phy << 23) | (reg << 10) | data);
+		for (i = 0; i < DC_TIMEOUT; i++) {
+			if (!(CSR_READ_4(sc, DC_PN_MII) & DC_PN_MII_BUSY))
+				break;
+		}
+		return;
+	}
+
+	if (DC_IS_COMET(sc)) {
+		switch(reg) {
+		case MII_BMCR:
+			phy_reg = DC_AL_BMCR;
+			break;
+		case MII_BMSR:
+			phy_reg = DC_AL_BMSR;
+			break;
+		case MII_PHYIDR1:
+			phy_reg = DC_AL_VENID;
+			break;
+		case MII_PHYIDR2:
+			phy_reg = DC_AL_DEVID;
+			break;
+		case MII_ANAR:
+			phy_reg = DC_AL_ANAR;
+			break;
+		case MII_ANLPAR:
+			phy_reg = DC_AL_LPAR;
+			break;
+		case MII_ANER:
+			phy_reg = DC_AL_ANER;
+			break;
+		default:
+			printf("dc%d: phy_write: bad phy register %x\n",
+			    sc->dc_unit, reg);
+			return;
+			break;
+		}
+
+		CSR_WRITE_4(sc, phy_reg, data);
+		return;
+	}
+
+	frame.mii_phyaddr = phy;
+	frame.mii_regaddr = reg;
+	frame.mii_data = data;
+
+	DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_PORTSEL);
+	dc_mii_writereg(sc, &frame);
+	DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_PORTSEL);
+
+	return;
+}
+
+void dc_miibus_statchg(self)
+	struct device		*self;
+{
+	struct dc_softc		*sc = (struct dc_softc *)self;
+	struct mii_data		*mii;
+
+	if (DC_IS_ADMTEK(sc))
+		return;
+	mii = &sc->sc_mii;
+	dc_setcfg(sc, mii->mii_media_active);
+	sc->dc_if_media = mii->mii_media_active;
+
+	return;
+}
+
+#define DC_POLY		0xEDB88320
+#define DC_BITS		9
+#define DC_BITS_PNIC_II	7
+
+u_int32_t dc_crc_le(sc, addr)
+	struct dc_softc		*sc;
+	caddr_t			addr;
+{
+	u_int32_t		idx, bit, data, crc;
+
+	/* Compute CRC for the address value. */
+	crc = 0xFFFFFFFF; /* initial value */
+
+	for (idx = 0; idx < 6; idx++) {
+		for (data = *addr++, bit = 0; bit < 8; bit++, data >>= 1)
+			crc = (crc >> 1) ^ (((crc ^ data) & 1) ? DC_POLY : 0);
+	}
+
+	/* The hash table on the PNIC II is only 128 bits wide. */
+	if (DC_IS_PNICII(sc))
+		return (crc & ((1 << DC_BITS_PNIC_II) - 1));
+
+	return (crc & ((1 << DC_BITS) - 1));
+}
+
+/*
+ * Calculate CRC of a multicast group address, return the lower 6 bits.
+ */
+u_int32_t dc_crc_be(addr)
+	caddr_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 >> 26) & 0x0000003F);
+}
+
+/*
+ * 21143-style RX filter setup routine. Filter programming is done by
+ * downloading a special setup frame into the TX engine. 21143, Macronix,
+ * PNIC, PNIC II and Davicom chips are programmed this way.
+ *
+ * We always program the chip using 'hash perfect' mode, i.e. one perfect
+ * address (our node address) and a 512-bit hash filter for multicast
+ * frames. We also sneak the broadcast address into the hash filter since
+ * we need that too.
+ */
+void dc_setfilt_21143(sc)
+	struct dc_softc		*sc;
+{
+	struct dc_desc		*sframe;
+	u_int32_t		h, *sp;
+	struct arpcom		*ac = &sc->arpcom;
+	struct ether_multi	*enm;
+	struct ether_multistep	step;
+	struct ifnet		*ifp;
+	int			i;
+
+	ifp = &sc->arpcom.ac_if;
+
+	i = sc->dc_cdata.dc_tx_prod;
+	DC_INC(sc->dc_cdata.dc_tx_prod, DC_TX_LIST_CNT);
+	sc->dc_cdata.dc_tx_cnt++;
+	sframe = &sc->dc_ldata->dc_tx_list[i];
+	sp = (u_int32_t *)&sc->dc_cdata.dc_sbuf;
+	bzero((char *)sp, DC_SFRAME_LEN);
+
+	sframe->dc_data = vtophys(&sc->dc_cdata.dc_sbuf);
+	sframe->dc_ctl = DC_SFRAME_LEN | DC_TXCTL_SETUP | DC_TXCTL_TLINK |
+	    DC_FILTER_HASHPERF | DC_TXCTL_FINT;
+
+	sc->dc_cdata.dc_tx_chain[i] = (struct mbuf *)&sc->dc_cdata.dc_sbuf;
+
+	/* If we want promiscuous mode, set the allframes bit. */
+	if (ifp->if_flags & IFF_PROMISC)
+		DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_RX_PROMISC);
+	else
+		DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_RX_PROMISC);
+
+	if (ifp->if_flags & IFF_ALLMULTI)
+		DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_RX_ALLMULTI);
+	else
+		DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_RX_ALLMULTI);
+
+	ETHER_FIRST_MULTI(step, ac, enm);
+	while (enm != NULL) {
+		h = dc_crc_le(sc, enm->enm_addrlo);
+		sp[h >> 4] |= 1 << (h & 0xF);
+		ETHER_NEXT_MULTI(step, enm);
+	}
+
+	if (ifp->if_flags & IFF_BROADCAST) {
+		h = dc_crc_le(sc, (caddr_t)&etherbroadcastaddr);
+		sp[h >> 4] |= 1 << (h & 0xF);
+	}
+
+	/* Set our MAC address */
+	sp[39] = ((u_int16_t *)sc->arpcom.ac_enaddr)[0];
+	sp[40] = ((u_int16_t *)sc->arpcom.ac_enaddr)[1];
+	sp[41] = ((u_int16_t *)sc->arpcom.ac_enaddr)[2];
+
+	sframe->dc_status = DC_TXSTAT_OWN;
+	CSR_WRITE_4(sc, DC_TXSTART, 0xFFFFFFFF);
+
+	/*
+	 * The PNIC takes an exceedingly long time to process its
+	 * setup frame; wait 10ms after posting the setup frame
+	 * before proceeding, just so it has time to swallow its
+	 * medicine.
+	 */
+	DELAY(10000);
+
+	ifp->if_timer = 5;
+
+	return;
+}
+
+void dc_setfilt_admtek(sc)
+	struct dc_softc		*sc;
+{
+	struct ifnet		*ifp;
+	struct arpcom		*ac = &sc->arpcom;
+	struct ether_multi	*enm;
+	struct ether_multistep	step;
+	int			h = 0;
+	u_int32_t		hashes[2] = { 0, 0 };
+
+	ifp = &sc->arpcom.ac_if;
+
+	/* Init our MAC address */
+	CSR_WRITE_4(sc, DC_AL_PAR0, *(u_int32_t *)(&sc->arpcom.ac_enaddr[0]));
+	CSR_WRITE_4(sc, DC_AL_PAR1, *(u_int32_t *)(&sc->arpcom.ac_enaddr[4]));
+
+	/* If we want promiscuous mode, set the allframes bit. */
+	if (ifp->if_flags & IFF_PROMISC)
+		DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_RX_PROMISC);
+	else
+		DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_RX_PROMISC);
+
+	if (ifp->if_flags & IFF_ALLMULTI)
+		DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_RX_ALLMULTI);
+	else
+		DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_RX_ALLMULTI);
+
+	/* first, zot all the existing hash bits */
+	CSR_WRITE_4(sc, DC_AL_MAR0, 0);
+	CSR_WRITE_4(sc, DC_AL_MAR1, 0);
+
+	/*
+	 * If we're already in promisc or allmulti mode, we
+	 * don't have to bother programming the multicast filter.
+	 */
+	if (ifp->if_flags & (IFF_PROMISC|IFF_ALLMULTI))
+		return;
+
+	/* now program new ones */
+	ETHER_FIRST_MULTI(step, ac, enm);
+	while (enm != NULL) {
+		h = dc_crc_be(enm->enm_addrlo);
+		if (h < 32)
+			hashes[0] |= (1 << h);
+		else
+			hashes[1] |= (1 << (h - 32));
+		ETHER_NEXT_MULTI(step, enm);
+	}
+
+	CSR_WRITE_4(sc, DC_AL_MAR0, hashes[0]);
+	CSR_WRITE_4(sc, DC_AL_MAR1, hashes[1]);
+
+	return;
+}
+
+void dc_setfilt_asix(sc)
+	struct dc_softc		*sc;
+{
+	struct ifnet		*ifp;
+	struct arpcom		*ac = &sc->arpcom;
+	struct ether_multi	*enm;
+	struct ether_multistep	step;
+	int			h = 0;
+	u_int32_t		hashes[2] = { 0, 0 };
+
+	ifp = &sc->arpcom.ac_if;
+
+        /* Init our MAC address */
+        CSR_WRITE_4(sc, DC_AX_FILTIDX, DC_AX_FILTIDX_PAR0);
+        CSR_WRITE_4(sc, DC_AX_FILTDATA,
+	    *(u_int32_t *)(&sc->arpcom.ac_enaddr[0]));
+        CSR_WRITE_4(sc, DC_AX_FILTIDX, DC_AX_FILTIDX_PAR1);
+        CSR_WRITE_4(sc, DC_AX_FILTDATA,
+	    *(u_int32_t *)(&sc->arpcom.ac_enaddr[4]));
+
+	/* If we want promiscuous mode, set the allframes bit. */
+	if (ifp->if_flags & IFF_PROMISC)
+		DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_RX_PROMISC);
+	else
+		DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_RX_PROMISC);
+
+	if (ifp->if_flags & IFF_ALLMULTI)
+		DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_RX_ALLMULTI);
+	else
+		DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_RX_ALLMULTI);
+
+	/*
+	 * The ASIX chip has a special bit to enable reception
+	 * of broadcast frames.
+	 */
+	if (ifp->if_flags & IFF_BROADCAST)
+		DC_SETBIT(sc, DC_NETCFG, DC_AX_NETCFG_RX_BROAD);
+	else
+		DC_CLRBIT(sc, DC_NETCFG, DC_AX_NETCFG_RX_BROAD);
+
+	/* first, zot all the existing hash bits */
+	CSR_WRITE_4(sc, DC_AX_FILTIDX, DC_AX_FILTIDX_MAR0);
+	CSR_WRITE_4(sc, DC_AX_FILTDATA, 0);
+	CSR_WRITE_4(sc, DC_AX_FILTIDX, DC_AX_FILTIDX_MAR1);
+	CSR_WRITE_4(sc, DC_AX_FILTDATA, 0);
+
+	/*
+	 * If we're already in promisc or allmulti mode, we
+	 * don't have to bother programming the multicast filter.
+	 */
+	if (ifp->if_flags & (IFF_PROMISC|IFF_ALLMULTI))
+		return;
+
+	/* now program new ones */
+	ETHER_FIRST_MULTI(step, ac, enm);
+	while (enm != NULL) {
+		h = dc_crc_be(enm->enm_addrlo);
+		if (h < 32)
+			hashes[0] |= (1 << h);
+		else
+			hashes[1] |= (1 << (h - 32));
+		ETHER_NEXT_MULTI(step, enm);
+	}
+
+	CSR_WRITE_4(sc, DC_AX_FILTIDX, DC_AX_FILTIDX_MAR0);
+	CSR_WRITE_4(sc, DC_AX_FILTDATA, hashes[0]);
+	CSR_WRITE_4(sc, DC_AX_FILTIDX, DC_AX_FILTIDX_MAR1);
+	CSR_WRITE_4(sc, DC_AX_FILTDATA, hashes[1]);
+
+	return;
+}
+
+void dc_setfilt(sc)
+	struct dc_softc		*sc;
+{
+	if (DC_IS_INTEL(sc) || DC_IS_MACRONIX(sc) || DC_IS_PNIC(sc) ||
+	    DC_IS_PNICII(sc) || DC_IS_DAVICOM(sc))
+		dc_setfilt_21143(sc);
+
+	if (DC_IS_ASIX(sc))
+		dc_setfilt_asix(sc);
+
+	if (DC_IS_ADMTEK(sc))
+		dc_setfilt_admtek(sc);
+
+	return;
+}
+
+/*
+ * In order to fiddle with the
+ * 'full-duplex' and '100Mbps' bits in the netconfig register, we
+ * first have to put the transmit and/or receive logic in the idle state.
+ */
+void dc_setcfg(sc, media)
+	struct dc_softc		*sc;
+	int			media;
+{
+	int			i, restart = 0;
+	u_int32_t		isr;
+
+	if (IFM_SUBTYPE(media) == IFM_NONE)
+		return;
+
+	if (CSR_READ_4(sc, DC_NETCFG) & (DC_NETCFG_TX_ON|DC_NETCFG_RX_ON)) {
+		restart = 1;
+		DC_CLRBIT(sc, DC_NETCFG, (DC_NETCFG_TX_ON|DC_NETCFG_RX_ON));
+
+		for (i = 0; i < DC_TIMEOUT; i++) {
+			DELAY(10);
+			isr = CSR_READ_4(sc, DC_ISR);
+			if (isr & DC_ISR_TX_IDLE ||
+			    (isr & DC_ISR_RX_STATE) == DC_RXSTATE_STOPPED)
+				break;
+		}
+
+		if (i == DC_TIMEOUT)
+			printf("dc%d: failed to force tx and "
+				"rx to idle state\n", sc->dc_unit);
+
+	}
+
+	if (IFM_SUBTYPE(media) == IFM_100_TX) {
+		DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_SPEEDSEL);
+		DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_HEARTBEAT);
+		if (sc->dc_pmode == DC_PMODE_MII) {
+			DC_SETBIT(sc, DC_WATCHDOG, DC_WDOG_JABBERDIS);
+			DC_CLRBIT(sc, DC_NETCFG, (DC_NETCFG_PCS|
+			    DC_NETCFG_PORTSEL|DC_NETCFG_SCRAMBLER));
+			if (sc->dc_type == DC_TYPE_98713)
+				DC_SETBIT(sc, DC_NETCFG, (DC_NETCFG_PCS|
+				    DC_NETCFG_SCRAMBLER));
+			DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_PORTSEL);
+			DC_CLRBIT(sc, DC_10BTCTRL, 0xFFFF);
+		} else {
+			if (DC_IS_PNIC(sc)) {
+				DC_PN_GPIO_SETBIT(sc, DC_PN_GPIO_SPEEDSEL);
+				DC_PN_GPIO_SETBIT(sc, DC_PN_GPIO_100TX_LOOP);
+				DC_SETBIT(sc, DC_PN_NWAY, DC_PN_NWAY_SPEEDSEL);
+			}
+			DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_PORTSEL|
+			    DC_NETCFG_PCS|DC_NETCFG_SCRAMBLER);
+		}
+	}
+
+	if (IFM_SUBTYPE(media) == IFM_10_T) {
+		DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_SPEEDSEL);
+		DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_HEARTBEAT);
+		if (sc->dc_pmode == DC_PMODE_MII) {
+			DC_SETBIT(sc, DC_WATCHDOG, DC_WDOG_JABBERDIS);
+			DC_CLRBIT(sc, DC_NETCFG, (DC_NETCFG_PCS|
+			    DC_NETCFG_PORTSEL|DC_NETCFG_SCRAMBLER));
+			if (sc->dc_type == DC_TYPE_98713)
+				DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_PCS);
+			DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_PORTSEL);
+			DC_CLRBIT(sc, DC_10BTCTRL, 0xFFFF);
+		} else {
+			if (DC_IS_PNIC(sc)) {
+				DC_PN_GPIO_CLRBIT(sc, DC_PN_GPIO_SPEEDSEL);
+				DC_PN_GPIO_SETBIT(sc, DC_PN_GPIO_100TX_LOOP);
+				DC_CLRBIT(sc, DC_PN_NWAY, DC_PN_NWAY_SPEEDSEL);
+			}
+			DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_PORTSEL);
+			DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_SCRAMBLER);
+			DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_PCS);
+		}
+	}
+
+	if ((media & IFM_GMASK) == IFM_FDX) {
+		DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_FULLDUPLEX);
+		if (sc->dc_pmode == DC_PMODE_SYM && DC_IS_PNIC(sc))
+			DC_SETBIT(sc, DC_PN_NWAY, DC_PN_NWAY_DUPLEX);
+	} else {
+		DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_FULLDUPLEX);
+		if (sc->dc_pmode == DC_PMODE_SYM && DC_IS_PNIC(sc))
+			DC_CLRBIT(sc, DC_PN_NWAY, DC_PN_NWAY_DUPLEX);
+	}
+
+	if (restart)
+		DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_TX_ON|DC_NETCFG_RX_ON);
+
+	return;
+}
+
+void dc_reset(sc)
+	struct dc_softc		*sc;
+{
+	register int		i;
+
+	DC_SETBIT(sc, DC_BUSCTL, DC_BUSCTL_RESET);
+
+	for (i = 0; i < DC_TIMEOUT; i++) {
+		DELAY(10);
+		if (!(CSR_READ_4(sc, DC_BUSCTL) & DC_BUSCTL_RESET))
+			break;
+	}
+
+	if (DC_IS_ASIX(sc) || DC_IS_ADMTEK(sc)) {
+		DELAY(10000);
+		DC_CLRBIT(sc, DC_BUSCTL, DC_BUSCTL_RESET);
+		i = 0;
+	}
+
+	if (i == DC_TIMEOUT)
+		printf("dc%d: reset never completed!\n", sc->dc_unit);
+
+	/* Wait a little while for the chip to get its brains in order. */
+	DELAY(1000);
+
+	CSR_WRITE_4(sc, DC_IMR, 0x00000000);
+	CSR_WRITE_4(sc, DC_BUSCTL, 0x00000000);
+	CSR_WRITE_4(sc, DC_NETCFG, 0x00000000);
+
+        return;
+}
+
+struct dc_type *dc_devtype(aux)
+	void			*aux;
+{
+	struct pci_attach_args	*pa = (struct pci_attach_args *)aux;
+	struct dc_type		*t;
+	pci_chipset_tag_t	pc = pa->pa_pc;
+	u_int32_t		rev;
+
+	t = dc_devs;
+
+	while(t->dc_name != NULL) {
+		if ((PCI_VENDOR(pa->pa_id) == t->dc_vid) &&
+		    (PCI_PRODUCT(pa->pa_id) == t->dc_did)) {
+			/* Check the PCI revision */
+			rev = pci_conf_read(pc, pa->pa_tag, DC_PCI_CFRV) & 0xFF;
+			if (t->dc_did == DC_DEVICEID_98713 &&
+			    rev >= DC_REVISION_98713A)
+				t++;
+			if (t->dc_did == DC_DEVICEID_98713_CP &&
+			    rev >= DC_REVISION_98713A)
+				t++;
+			if (t->dc_did == DC_DEVICEID_987x5 &&
+			    rev >= DC_REVISION_98725)
+				t++;
+			if (t->dc_did == DC_DEVICEID_AX88140A &&
+			    rev >= DC_REVISION_88141)
+				t++;
+			if (t->dc_did == DC_DEVICEID_82C168 &&
+			    rev >= DC_REVISION_82C169)
+				t++;
+			return(t);
+		}
+		t++;
+	}
+
+	return(NULL);
+}
+
+/*
+ * Probe for a 21143 or clone chip. Check the PCI vendor and device
+ * IDs against our list and return a device name if we find a match.
+ * We do a little bit of extra work to identify the exact type of
+ * chip. The MX98713 and MX98713A have the same PCI vendor/device ID,
+ * but different revision IDs. The same is true for 98715/98715A
+ * chips and the 98725, as well as the ASIX and ADMtek chips. In some
+ * cases, the exact chip revision affects driver behavior.
+ */
+int dc_probe(parent, match, aux)
+	struct device		*parent;
+	void			*match, *aux;
+{
+	struct dc_type		*t;
+
+	t = dc_devtype(aux);
+
+	if (t != NULL)
+		return(1);
+
+	return(0);
+}
+
+void dc_acpi(self, aux)
+	struct device		*self;
+	void			*aux;
+{
+	struct dc_softc		*sc = (struct dc_softc *)self;
+	struct pci_attach_args	*pa = (struct pci_attach_args *)aux;
+	pci_chipset_tag_t	pc = pa->pa_pc;
+	u_int32_t		r, cptr;
+	int			unit;
+
+	unit = sc->dc_unit;
+
+	/* Find the location of the capabilities block */
+	cptr = pci_conf_read(pc, pa->pa_tag, DC_PCI_CCAP) & 0xFF;
+
+	r = pci_conf_read(pc, pa->pa_tag, cptr) & 0xFF;
+	if (r == 0x01) {
+
+		r = pci_conf_read(pc, pa->pa_tag, cptr + 4);
+		if (r & DC_PSTATE_D3) {
+			u_int32_t		iobase, membase, irq;
+
+			/* Save important PCI config data. */
+			iobase = pci_conf_read(pc, pa->pa_tag, DC_PCI_CFBIO);
+			membase = pci_conf_read(pc, pa->pa_tag, DC_PCI_CFBMA);
+			irq = pci_conf_read(pc, pa->pa_tag, DC_PCI_CFIT);
+
+			/* Reset the power state. */
+			printf("dc%d: chip is in D%d power mode "
+			    "-- setting to D0\n", unit, r & DC_PSTATE_D3);
+			r &= 0xFFFFFFFC;
+			pci_conf_write(pc, pa->pa_tag, cptr + 4, r);
+
+			/* Restore PCI config data. */
+			pci_conf_write(pc, pa->pa_tag, DC_PCI_CFBIO, iobase);
+			pci_conf_write(pc, pa->pa_tag, DC_PCI_CFBMA, membase);
+			pci_conf_write(pc, pa->pa_tag, DC_PCI_CFIT, irq);
+		}
+	}
+	return;
+}
+
+/*
+ * Attach the interface. Allocate softc structures, do ifmedia
+ * setup and ethernet/BPF attach.
+ */
+void dc_attach(parent, self, aux)
+	struct device		*parent, *self;
+	void			*aux;
+{
+	int			s;
+	const char		*intrstr = NULL;
+	u_int32_t		command;
+	struct dc_softc		*sc = (struct dc_softc *)self;
+	struct pci_attach_args	*pa = aux;
+	pci_chipset_tag_t	pc = pa->pa_pc;
+	pci_intr_handle_t	ih;
+	struct ifnet		*ifp;
+	bus_addr_t		iobase;
+	bus_size_t		iosize;
+	u_int32_t		revision;
+	int			mac_offset;
+
+	s = splimp();
+	sc->dc_unit = sc->sc_dev.dv_unit;
+
+	/*
+	 * Handle power management nonsense.
+	 */
+	dc_acpi(self, aux);
+
+	/*
+	 * Map control/status registers.
+	 */
+	command = pci_conf_read(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
+	command |= PCI_COMMAND_IO_ENABLE | PCI_COMMAND_MEM_ENABLE |
+	    PCI_COMMAND_MASTER_ENABLE;
+	pci_conf_write(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG, command);
+	command = pci_conf_read(pc, pa->pa_tag, PCI_COMMAND_STATUS_REG);
+
+#ifdef DC_USEIOSPACE
+	if (!(command & PCI_COMMAND_IO_ENABLE)) {
+		printf(": failed to enable I/O ports\n");
+		goto fail;
+	}
+	if (pci_io_find(pc, pa->pa_tag, DC_PCI_CFBIO, &iobase, &iosize)) {
+		printf(": can't find I/O space\n");
+		goto fail;
+	}
+	if (bus_space_map(pa->pa_iot, iobase, iosize, 0, &sc->dc_bhandle)) {
+		printf(": can't map I/O space\n");
+		goto fail;
+	}
+	sc->dc_btag = pa->pa_iot;
+#else
+	if (!(command & PCI_COMMAND_MEM_ENABLE)) {
+		printf(": failed to enable memory mapping\n");
+		goto fail;
+	}
+	if (pci_mem_find(pc, pa->pa_tag, DC_PCI_CFBMA, &iobase, &iosize, NULL)){
+		printf(": can't find mem space\n");
+		goto fail;
+	}
+	if (bus_space_map(pa->pa_memt, iobase, iosize, 0, &sc->dc_bhandle)) {
+		printf(": can't map mem space\n");
+		goto fail;
+	}
+	sc->dc_btag = pa->pa_memt;
+#endif
+
+	/* Allocate interrupt */
+	if (pci_intr_map(pc, pa->pa_intrtag, pa->pa_intrpin, pa->pa_intrline,
+	    &ih)) {
+		printf(": couldn't map interrupt\n");
+		goto fail;
+	}
+	intrstr = pci_intr_string(pc, ih);
+	sc->sc_ih = pci_intr_establish(pc, ih, IPL_NET, dc_intr, sc,
+	    self->dv_xname);
+	if (sc->sc_ih == NULL) {
+		printf(": couldn't establish interrupt");
+		if (intrstr != NULL)
+			printf(" at %s", intrstr);
+		printf("\n");
+		goto fail;
+	}
+	printf(": %s", intrstr);
+
+	/* Need this info to decide on a chip type. */
+	sc->dc_info = dc_devtype(aux);
+	revision = pci_conf_read(pc, pa->pa_tag, DC_PCI_CFRV) & 0x000000FF;
+
+	switch(sc->dc_info->dc_did) {
+	case DC_DEVICEID_21143:
+		sc->dc_type = DC_TYPE_21143;
+		sc->dc_flags |= DC_TX_POLL|DC_TX_USE_TX_INTR;
+		sc->dc_flags |= DC_REDUCED_MII_POLL;
+		break;
+	case DC_DEVICEID_DM9100:
+	case DC_DEVICEID_DM9102:
+		sc->dc_type = DC_TYPE_DM9102;
+		sc->dc_flags |= DC_TX_USE_TX_INTR;
+		sc->dc_flags |= DC_REDUCED_MII_POLL;
+		sc->dc_pmode = DC_PMODE_MII;
+		break;
+	case DC_DEVICEID_AL981:
+		sc->dc_type = DC_TYPE_AL981;
+		sc->dc_flags |= DC_TX_USE_TX_INTR;
+		sc->dc_flags |= DC_TX_ADMTEK_WAR;
+		sc->dc_pmode = DC_PMODE_MII;
+		break;
+	case DC_DEVICEID_AN985:
+		sc->dc_type = DC_TYPE_AN985;
+		sc->dc_flags |= DC_TX_USE_TX_INTR;
+		sc->dc_flags |= DC_TX_ADMTEK_WAR;
+		sc->dc_pmode = DC_PMODE_MII;
+		break;
+	case DC_DEVICEID_98713:
+	case DC_DEVICEID_98713_CP:
+		if (revision < DC_REVISION_98713A) {
+			sc->dc_type = DC_TYPE_98713;
+			sc->dc_flags |= DC_REDUCED_MII_POLL;
+		}
+		if (revision >= DC_REVISION_98713A)
+			sc->dc_type = DC_TYPE_98713A;
+		sc->dc_flags |= DC_TX_POLL|DC_TX_USE_TX_INTR;
+		break;
+	case DC_DEVICEID_987x5:
+		sc->dc_type = DC_TYPE_987x5;
+		sc->dc_flags |= DC_TX_POLL|DC_TX_USE_TX_INTR;
+		break;
+	case DC_DEVICEID_82C115:
+		sc->dc_type = DC_TYPE_PNICII;
+		sc->dc_flags |= DC_TX_POLL|DC_TX_USE_TX_INTR;
+		break;
+	case DC_DEVICEID_82C168:
+		sc->dc_type = DC_TYPE_PNIC;
+		sc->dc_flags |= DC_TX_STORENFWD|DC_TX_USE_TX_INTR;
+		sc->dc_flags |= DC_PNIC_RX_BUG_WAR;
+		sc->dc_pnic_rx_buf = malloc(DC_RXLEN * 5, M_DEVBUF, M_NOWAIT);
+		if (revision < DC_REVISION_82C169)
+			sc->dc_pmode = DC_PMODE_SYM;
+		break;
+	case DC_DEVICEID_AX88140A:
+		sc->dc_type = DC_TYPE_ASIX;
+		sc->dc_flags |= DC_TX_USE_TX_INTR|DC_TX_INTR_FIRSTFRAG;
+		sc->dc_flags |= DC_REDUCED_MII_POLL;
+		sc->dc_pmode = DC_PMODE_MII;
+		break;
+	default:
+		printf("%d: unknown device: %x\n", sc->dc_unit,
+		    sc->dc_info->dc_did);
+		break;
+	}
+
+	/* Save the cache line size. */
+	sc->dc_cachesize = pci_conf_read(pc, pa->pa_tag, DC_PCI_CFLT) & 0xFF;
+
+	/* Reset the adapter. */
+	dc_reset(sc);
+
+	/* Take 21143 out of snooze mode */
+	if (DC_IS_INTEL(sc)) {
+		command = pci_conf_read(pc, pa->pa_tag, DC_PCI_CFDD);
+		command &= ~(DC_CFDD_SNOOZE_MODE|DC_CFDD_SLEEP_MODE);
+		pci_conf_write(pc, pa->pa_tag, DC_PCI_CFDD, command);
+	}
+
+	/*
+	 * Try to learn something about the supported media.
+	 * We know that ASIX and ADMtek and Davicom devices
+	 * will *always* be using MII media, so that's a no-brainer.
+	 * The tricky ones are the Macronix/PNIC II and the
+	 * Intel 21143.
+	 */
+	if (DC_IS_INTEL(sc)) {
+		u_int32_t		media, cwuc;
+		cwuc = pci_conf_read(pc, pa->pa_tag, DC_PCI_CWUC);
+		cwuc |= DC_CWUC_FORCE_WUL;
+		pci_conf_write(pc, pa->pa_tag, DC_PCI_CWUC, cwuc);
+		DELAY(10000);
+		media = pci_conf_read(pc, pa->pa_tag, DC_PCI_CWUC);
+		cwuc &= ~DC_CWUC_FORCE_WUL;
+		pci_conf_write(pc, pa->pa_tag, DC_PCI_CWUC, cwuc);
+		DELAY(10000);
+		if (media & DC_CWUC_MII_ABILITY)
+			sc->dc_pmode = DC_PMODE_MII;
+		if (media & DC_CWUC_SYM_ABILITY)
+			sc->dc_pmode = DC_PMODE_SYM;
+		/*
+		 * If none of the bits are set, then this NIC
+		 * isn't meant to support 'wake up LAN' mode.
+		 * This is usually only the case on multiport
+		 * cards, and these cards almost always have
+		 * MII transceivers.
+		 */
+		if (media == 0)
+			sc->dc_pmode = DC_PMODE_MII;
+	} else if (DC_IS_MACRONIX(sc) || DC_IS_PNICII(sc)) {
+		if (sc->dc_type == DC_TYPE_98713)
+			sc->dc_pmode = DC_PMODE_MII;
+		else
+			sc->dc_pmode = DC_PMODE_SYM;
+	} else if (!sc->dc_pmode)
+		sc->dc_pmode = DC_PMODE_MII;
+
+	/*
+	 * Get station address from the EEPROM.
+	 */
+	switch(sc->dc_type) {
+	case DC_TYPE_98713:
+	case DC_TYPE_98713A:
+	case DC_TYPE_987x5:
+	case DC_TYPE_PNICII:
+		dc_read_eeprom(sc, (caddr_t)&mac_offset,
+		    (DC_EE_NODEADDR_OFFSET / 2), 1, 0);
+		dc_read_eeprom(sc, (caddr_t)&sc->arpcom.ac_enaddr,
+		    (mac_offset / 2), 3, 0);
+		break;
+	case DC_TYPE_PNIC:
+		dc_read_eeprom(sc, (caddr_t)&sc->arpcom.ac_enaddr, 0, 3, 1);
+		break;
+	case DC_TYPE_DM9102:
+	case DC_TYPE_21143:
+	case DC_TYPE_ASIX:
+		dc_read_eeprom(sc, (caddr_t)&sc->arpcom.ac_enaddr,	
+		    DC_EE_NODEADDR, 3, 0);
+		break;
+	case DC_TYPE_AL981:
+	case DC_TYPE_AN985:
+		dc_read_eeprom(sc, (caddr_t)&sc->arpcom.ac_enaddr,
+		    DC_AL_EE_NODEADDR, 3, 0);
+		break;
+	default:
+		dc_read_eeprom(sc, (caddr_t)&sc->arpcom.ac_enaddr,
+		    DC_EE_NODEADDR, 3, 0);
+		break;
+	}
+
+	/*
+	 * A 21143 or clone chip was detected. Inform the world.
+	 */
+	printf(" address %s\n", ether_sprintf(sc->arpcom.ac_enaddr));
+
+	sc->dc_ldata_ptr = malloc(sizeof(struct dc_list_data), M_DEVBUF,
+				M_NOWAIT);
+	if (sc->dc_ldata_ptr == NULL) {
+		printf("%s: no memory for list buffers!\n", sc->dc_unit);
+		goto fail;
+	}
+
+	sc->dc_ldata = (struct dc_list_data *)sc->dc_ldata_ptr;
+	bzero(sc->dc_ldata, sizeof(struct dc_list_data));
+
+	ifp = &sc->arpcom.ac_if;
+	ifp->if_softc = sc;
+	ifp->if_mtu = ETHERMTU;
+	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
+	ifp->if_ioctl = dc_ioctl;
+	ifp->if_output = ether_output;
+	ifp->if_start = dc_start;
+	ifp->if_watchdog = dc_watchdog;
+	ifp->if_baudrate = 10000000;
+	ifp->if_snd.ifq_maxlen = DC_TX_LIST_CNT - 1;
+	bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);
+
+	sc->sc_mii.mii_ifp = ifp;
+	sc->sc_mii.mii_readreg = dc_miibus_readreg;
+	sc->sc_mii.mii_writereg = dc_miibus_writereg;
+	sc->sc_mii.mii_statchg = dc_miibus_statchg;
+	ifmedia_init(&sc->sc_mii.mii_media, 0, dc_ifmedia_upd, dc_ifmedia_sts);
+	mii_phy_probe(self, &sc->sc_mii, 0xffffffff);
+	if (LIST_FIRST(&sc->sc_mii.mii_phys) == NULL) {
+		ifmedia_add(&sc->sc_mii.mii_media, IFM_ETHER|IFM_NONE, 0, NULL);
+		ifmedia_set(&sc->sc_mii.mii_media, IFM_ETHER|IFM_NONE);
+	} else
+		ifmedia_set(&sc->sc_mii.mii_media, IFM_ETHER|IFM_AUTO);
+
+	/* if (error && DC_IS_INTEL(sc)) {
+		sc->dc_pmode = DC_PMODE_SYM;
+		mii_phy_probe(dev, &sc->dc_miibus,
+		    dc_ifmedia_upd, dc_ifmedia_sts);
+		error = 0;
+	}
+
+	if (error) {
+		printf("dc%d: MII without any PHY!\n", sc->dc_unit);
+		bus_teardown_intr(dev, sc->dc_irq, sc->dc_intrhand);
+		bus_release_resource(dev, SYS_RES_IRQ, 0, sc->dc_irq);
+		bus_release_resource(dev, DC_RES, DC_RID, sc->dc_res);
+		error = ENXIO;
+		goto fail;
+	} */
+
+	/*
+	 * Call MI attach routines.
+	 */
+	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(dc_shutdown, sc);
+
+fail:
+	splx(s);
+	return;
+}
+
+/*
+ * Initialize the transmit descriptors.
+ */
+int dc_list_tx_init(sc)
+	struct dc_softc		*sc;
+{
+	struct dc_chain_data	*cd;
+	struct dc_list_data	*ld;
+	int			i;
+
+	cd = &sc->dc_cdata;
+	ld = sc->dc_ldata;
+	for (i = 0; i < DC_TX_LIST_CNT; i++) {
+		if (i == (DC_TX_LIST_CNT - 1)) {
+			ld->dc_tx_list[i].dc_next =
+			    vtophys(&ld->dc_tx_list[0]);
+		} else {
+			ld->dc_tx_list[i].dc_next =
+			    vtophys(&ld->dc_tx_list[i + 1]);
+		}
+		cd->dc_tx_chain[i] = NULL;
+		ld->dc_tx_list[i].dc_data = 0;
+		ld->dc_tx_list[i].dc_ctl = 0;
+	}
+
+	cd->dc_tx_prod = cd->dc_tx_cons = cd->dc_tx_cnt = 0;
+
+	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.
+ */
+int dc_list_rx_init(sc)
+	struct dc_softc		*sc;
+{
+	struct dc_chain_data	*cd;
+	struct dc_list_data	*ld;
+	int			i;
+
+	cd = &sc->dc_cdata;
+	ld = sc->dc_ldata;
+
+	for (i = 0; i < DC_RX_LIST_CNT; i++) {
+		if (dc_newbuf(sc, i, NULL) == ENOBUFS)
+			return(ENOBUFS);
+		if (i == (DC_RX_LIST_CNT - 1)) {
+			ld->dc_rx_list[i].dc_next =
+			    vtophys(&ld->dc_rx_list[0]);
+		} else {
+			ld->dc_rx_list[i].dc_next =
+			    vtophys(&ld->dc_rx_list[i + 1]);
+		}
+	}
+
+	cd->dc_rx_prod = 0;
+
+	return(0);
+}
+
+/*
+ * Initialize an RX descriptor and attach an MBUF cluster.
+ */
+int dc_newbuf(sc, i, m)
+	struct dc_softc		*sc;
+	int			i;
+	struct mbuf		*m;
+{
+	struct mbuf		*m_new = NULL;
+	struct dc_desc		*c;
+
+	c = &sc->dc_ldata->dc_rx_list[i];
+
+	if (m == NULL) {
+		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		if (m_new == NULL) {
+			printf("dc%d: no memory for rx list "
+			    "-- packet dropped!\n", sc->dc_unit);
+			return(ENOBUFS);
+		}
+
+		MCLGET(m_new, M_DONTWAIT);
+		if (!(m_new->m_flags & M_EXT)) {
+			printf("dc%d: no memory for rx list "
+			    "-- packet dropped!\n", sc->dc_unit);
+			m_freem(m_new);
+			return(ENOBUFS);
+		}
+		m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
+	} else {
+		m_new = m;
+		m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
+		m_new->m_data = m_new->m_ext.ext_buf;
+	}
+
+	m_adj(m_new, sizeof(u_int64_t));
+
+	/*
+	 * If this is a PNIC chip, zero the buffer. This is part
+	 * of the workaround for the receive bug in the 82c168 and
+	 * 82c169 chips.
+	 */
+	if (sc->dc_flags & DC_PNIC_RX_BUG_WAR)
+		bzero((char *)mtod(m_new, char *), m_new->m_len);
+
+	sc->dc_cdata.dc_rx_chain[i] = m_new;
+	c->dc_data = vtophys(mtod(m_new, caddr_t));
+	c->dc_ctl = DC_RXCTL_RLINK | DC_RXLEN;
+	c->dc_status = DC_RXSTAT_OWN;
+
+	return(0);
+}
+
+/*
+ * Grrrrr.
+ * The PNIC chip has a terrible bug in it that manifests itself during
+ * periods of heavy activity. The exact mode of failure if difficult to
+ * pinpoint: sometimes it only happens in promiscuous mode, sometimes it
+ * will happen on slow machines. The bug is that sometimes instead of
+ * uploading one complete frame during reception, it uploads what looks
+ * like the entire contents of its FIFO memory. The frame we want is at
+ * the end of the whole mess, but we never know exactly how much data has
+ * been uploaded, so salvaging the frame is hard.
+ *
+ * There is only one way to do it reliably, and it's disgusting.
+ * Here's what we know:
+ *
+ * - We know there will always be somewhere between one and three extra
+ *   descriptors uploaded.
+ *
+ * - We know the desired received frame will always be at the end of the
+ *   total data upload.
+ *
+ * - We know the size of the desired received frame because it will be
+ *   provided in the length field of the status word in the last descriptor.
+ *
+ * Here's what we do:
+ *
+ * - When we allocate buffers for the receive ring, we bzero() them.
+ *   This means that we know that the buffer contents should be all
+ *   zeros, except for data uploaded by the chip.
+ *
+ * - We also force the PNIC chip to upload frames that include the
+ *   ethernet CRC at the end.
+ *
+ * - We gather all of the bogus frame data into a single buffer.
+ *
+ * - We then position a pointer at the end of this buffer and scan
+ *   backwards until we encounter the first non-zero byte of data.
+ *   This is the end of the received frame. We know we will encounter
+ *   some data at the end of the frame because the CRC will always be
+ *   there, so even if the sender transmits a packet of all zeros,
+ *   we won't be fooled.
+ *
+ * - We know the size of the actual received frame, so we subtract
+ *   that value from the current pointer location. This brings us
+ *   to the start of the actual received packet.
+ *
+ * - We copy this into an mbuf and pass it on, along with the actual
+ *   frame length.
+ *
+ * The performance hit is tremendous, but it beats dropping frames all
+ * the time.
+ */
+
+#define DC_WHOLEFRAME	(DC_RXSTAT_FIRSTFRAG|DC_RXSTAT_LASTFRAG)
+void dc_pnic_rx_bug_war(sc, idx)
+	struct dc_softc		*sc;
+	int			idx;
+{
+	struct dc_desc		*cur_rx;
+	struct dc_desc		*c = NULL;
+	struct mbuf		*m = NULL;
+	unsigned char		*ptr;
+	int			i, total_len;
+	u_int32_t		rxstat = 0;
+
+	i = sc->dc_pnic_rx_bug_save;
+	cur_rx = &sc->dc_ldata->dc_rx_list[idx];
+	ptr = sc->dc_pnic_rx_buf;
+	bzero(ptr, sizeof(DC_RXLEN * 5));
+
+	/* Copy all the bytes from the bogus buffers. */
+	while (1) {
+		c = &sc->dc_ldata->dc_rx_list[i];
+		rxstat = c->dc_status;
+		m = sc->dc_cdata.dc_rx_chain[i];
+		bcopy(mtod(m, char *), ptr, DC_RXLEN);
+		ptr += DC_RXLEN;
+		/* If this is the last buffer, break out. */
+		if (i == idx || rxstat & DC_RXSTAT_LASTFRAG)
+			break;
+		dc_newbuf(sc, i, m);
+		DC_INC(i, DC_RX_LIST_CNT);
+	}
+
+	/* Find the length of the actual receive frame. */
+	total_len = DC_RXBYTES(rxstat);
+
+	/* Scan backwards until we hit a non-zero byte. */
+	while(*ptr == 0x00)
+		ptr--;
+
+	/* Round off. */
+	if ((unsigned long)(ptr) & 0x3)
+		ptr -= 1;
+
+	/* Now find the start of the frame. */
+	ptr -= total_len;
+	if (ptr < sc->dc_pnic_rx_buf)
+		ptr = sc->dc_pnic_rx_buf;
+
+	/*
+	 * Now copy the salvaged frame to the last mbuf and fake up
+	 * the status word to make it look like a successful
+ 	 * frame reception.
+	 */
+	dc_newbuf(sc, i, m);
+	bcopy(ptr, mtod(m, char *), total_len);	
+	cur_rx->dc_status = rxstat | DC_RXSTAT_FIRSTFRAG;
+
+	return;
+}
+
+/*
+ * A frame has been uploaded: pass the resulting mbuf chain up to
+ * the higher level protocols.
+ */
+void dc_rxeof(sc)
+	struct dc_softc		*sc;
+{
+        struct ether_header	*eh;
+        struct mbuf		*m;
+        struct ifnet		*ifp;
+	struct dc_desc		*cur_rx;
+	int			i, total_len = 0;
+	u_int32_t		rxstat;
+
+	ifp = &sc->arpcom.ac_if;
+	i = sc->dc_cdata.dc_rx_prod;
+
+	while(!(sc->dc_ldata->dc_rx_list[i].dc_status & DC_RXSTAT_OWN)) {
+		struct mbuf		*m0 = NULL;
+
+		cur_rx = &sc->dc_ldata->dc_rx_list[i];
+		rxstat = cur_rx->dc_status;
+		m = sc->dc_cdata.dc_rx_chain[i];
+		total_len = DC_RXBYTES(rxstat);
+
+		if (sc->dc_flags & DC_PNIC_RX_BUG_WAR) {
+			if ((rxstat & DC_WHOLEFRAME) != DC_WHOLEFRAME) {
+				if (rxstat & DC_RXSTAT_FIRSTFRAG)
+					sc->dc_pnic_rx_bug_save = i;
+				if ((rxstat & DC_RXSTAT_LASTFRAG) == 0) {
+					DC_INC(i, DC_RX_LIST_CNT);
+					continue;
+				}
+				dc_pnic_rx_bug_war(sc, i);
+				rxstat = cur_rx->dc_status;
+				total_len = DC_RXBYTES(rxstat);
+			}
+		}
+
+		sc->dc_cdata.dc_rx_chain[i] = NULL;
+
+		/*
+		 * 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 & DC_RXSTAT_RXERR) {
+			ifp->if_ierrors++;
+			if (rxstat & DC_RXSTAT_COLLSEEN)
+				ifp->if_collisions++;
+			dc_newbuf(sc, i, m);
+			if (rxstat & DC_RXSTAT_CRCERR) {
+				DC_INC(i, DC_RX_LIST_CNT);
+				continue;
+			} else {
+				dc_init(sc);
+				return;
+			}
+		}
+
+		/* No errors; receive the packet. */	
+		total_len -= ETHER_CRC_LEN;
+
+		m0 = m_devget(mtod(m, char *) - ETHER_ALIGN,
+		    total_len + ETHER_ALIGN, 0, ifp, NULL);
+		dc_newbuf(sc, i, m);
+		DC_INC(i, DC_RX_LIST_CNT);
+		if (m0 == NULL) {
+			ifp->if_ierrors++;
+			continue;
+		}
+		m_adj(m0, ETHER_ALIGN);
+		m = m0;
+
+		ifp->if_ipackets++;
+		eh = mtod(m, struct ether_header *);
+
+#if NBPFILTER > 0
+		if (ifp->if_bpf)
+			bpf_mtap(ifp->if_bpf, m);
+#endif
+
+		/* Remove header from mbuf and pass it on. */
+		m_adj(m, sizeof(struct ether_header));
+		ether_input(ifp, eh, m);
+	}
+
+	sc->dc_cdata.dc_rx_prod = i;
+
+	return;
+}
+
+/*
+ * A frame was downloaded to the chip. It's safe for us to clean up
+ * the list buffers.
+ */
+
+void dc_txeof(sc)
+	struct dc_softc		*sc;
+{
+	struct dc_desc		*cur_tx = NULL;
+	struct ifnet		*ifp;
+	int			idx;
+
+	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 transmitted.
+	 */
+	idx = sc->dc_cdata.dc_tx_cons;
+	while(idx != sc->dc_cdata.dc_tx_prod) {
+		u_int32_t		txstat;
+
+		cur_tx = &sc->dc_ldata->dc_tx_list[idx];
+		txstat = cur_tx->dc_status;
+
+		if (txstat & DC_TXSTAT_OWN)
+			break;
+
+		if (!(cur_tx->dc_ctl & DC_TXCTL_LASTFRAG) ||
+		    cur_tx->dc_ctl & DC_TXCTL_SETUP) {
+			sc->dc_cdata.dc_tx_cnt--;
+			if (cur_tx->dc_ctl & DC_TXCTL_SETUP) {
+				/*
+				 * Yes, the PNIC is so brain damaged
+				 * that it will sometimes generate a TX
+				 * underrun error while DMAing the RX
+				 * filter setup frame. If we detect this,
+				 * we have to send the setup frame again,
+				 * or else the filter won't be programmed
+				 * correctly.
+				 */
+				if (DC_IS_PNIC(sc)) {
+					if (txstat & DC_TXSTAT_ERRSUM)
+						dc_setfilt(sc);
+				}
+				sc->dc_cdata.dc_tx_chain[idx] = NULL;
+			}
+			DC_INC(idx, DC_TX_LIST_CNT);
+			continue;
+		}
+
+		if (/*sc->dc_type == DC_TYPE_21143 &&*/
+		    sc->dc_pmode == DC_PMODE_MII &&
+		    ((txstat & 0xFFFF) & ~(DC_TXSTAT_ERRSUM|
+		    DC_TXSTAT_NOCARRIER|DC_TXSTAT_CARRLOST)))
+			txstat &= ~DC_TXSTAT_ERRSUM;
+
+		if (txstat & DC_TXSTAT_ERRSUM) {
+			ifp->if_oerrors++;
+			if (txstat & DC_TXSTAT_EXCESSCOLL)
+				ifp->if_collisions++;
+			if (txstat & DC_TXSTAT_LATECOLL)
+				ifp->if_collisions++;
+			if (!(txstat & DC_TXSTAT_UNDERRUN)) {
+				dc_init(sc);
+				return;
+			}
+		}
+
+		ifp->if_collisions += (txstat & DC_TXSTAT_COLLCNT) >> 3;
+
+		ifp->if_opackets++;
+		if (sc->dc_cdata.dc_tx_chain[idx] != NULL) {
+			m_freem(sc->dc_cdata.dc_tx_chain[idx]);
+			sc->dc_cdata.dc_tx_chain[idx] = NULL;
+		}
+
+		sc->dc_cdata.dc_tx_cnt--;
+		DC_INC(idx, DC_TX_LIST_CNT);
+	}
+
+	sc->dc_cdata.dc_tx_cons = idx;
+	if (cur_tx != NULL)
+		ifp->if_flags &= ~IFF_OACTIVE;
+
+	return;
+}
+
+void dc_tick(xsc)
+	void			*xsc;
+{
+	struct dc_softc		*sc = (struct dc_softc *)xsc;
+	struct mii_data		*mii;
+	struct ifnet		*ifp;
+	int			s;
+	u_int32_t		r;
+
+	s = splimp();
+
+	ifp = &sc->arpcom.ac_if;
+	mii = &sc->sc_mii;
+
+	if (sc->dc_flags & DC_REDUCED_MII_POLL) {
+		r = CSR_READ_4(sc, DC_ISR);
+		if (DC_IS_INTEL(sc)) {
+			if (r & DC_ISR_LINKFAIL) 
+				sc->dc_link = 0;
+			if (sc->dc_link == 0)
+				mii_tick(mii);
+		} else {
+			if ((r & DC_ISR_RX_STATE) == DC_RXSTATE_WAIT &&
+			    sc->dc_cdata.dc_tx_prod == 0)
+				mii_tick(mii);
+		}
+	} else
+		mii_tick(mii);
+
+	/*
+	 * When the init routine completes, we expect to be able to send
+	 * packets right away, and in fact the network code will send a
+	 * gratuitous ARP the moment the init routine marks the interface
+	 * as running. However, even though the MAC may have been initialized,
+	 * there may be a delay of a few seconds before the PHY completes
+	 * autonegotiation and the link is brought up. Any transmissions
+	 * made during that delay will be lost. Dealing with this is tricky:
+	 * we can't just pause in the init routine while waiting for the
+	 * PHY to come ready since that would bring the whole system to
+	 * a screeching halt for several seconds.
+	 *
+	 * What we do here is prevent the TX start routine from sending
+	 * any packets until a link has been established. After the
+	 * interface has been initialized, the tick routine will poll
+	 * the state of the PHY until the IFM_ACTIVE flag is set. Until
+	 * that time, packets will stay in the send queue, and once the
+	 * link comes up, they will be flushed out to the wire.
+	 */
+	if (!sc->dc_link) {
+		mii_pollstat(mii);
+		if (mii->mii_media_status & IFM_ACTIVE &&
+		    IFM_SUBTYPE(mii->mii_media_active) != IFM_NONE) {
+			sc->dc_link++;
+			if (ifp->if_snd.ifq_head != NULL)
+				dc_start(ifp);
+		}
+	}
+
+	timeout(dc_tick, sc, hz);
+
+	splx(s);
+
+	return;
+}
+
+int dc_intr(arg)
+	void			*arg;
+{
+	struct dc_softc		*sc;
+	struct ifnet		*ifp;
+	u_int32_t		status;
+	int			claimed = 0;
+
+	sc = arg;
+	ifp = &sc->arpcom.ac_if;
+
+	/* Supress unwanted interrupts */
+	if (!(ifp->if_flags & IFF_UP)) {
+		if (CSR_READ_4(sc, DC_ISR) & DC_INTRS)
+			dc_stop(sc);
+		return claimed;
+	}
+
+	claimed = 1;
+
+	/* Disable interrupts. */
+	CSR_WRITE_4(sc, DC_IMR, 0x00000000);
+
+	while((status = CSR_READ_4(sc, DC_ISR)) & DC_INTRS) {
+
+		CSR_WRITE_4(sc, DC_ISR, status);
+
+		if (status & DC_ISR_RX_OK)
+			dc_rxeof(sc);
+
+		if (status & (DC_ISR_TX_OK|DC_ISR_TX_NOBUF))
+			dc_txeof(sc);
+
+		if (status & DC_ISR_TX_IDLE) {
+			dc_txeof(sc);
+			if (sc->dc_cdata.dc_tx_cnt) {
+				DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_TX_ON);
+				CSR_WRITE_4(sc, DC_TXSTART, 0xFFFFFFFF);
+			}
+		}
+
+		if (status & DC_ISR_TX_UNDERRUN) {
+			u_int32_t		cfg;
+
+			printf("dc%d: TX underrun -- ", sc->dc_unit);
+			if (DC_IS_DAVICOM(sc) || DC_IS_INTEL(sc))
+				dc_init(sc);
+			cfg = CSR_READ_4(sc, DC_NETCFG);
+			cfg &= ~DC_NETCFG_TX_THRESH;
+			if (sc->dc_txthresh == DC_TXTHRESH_160BYTES) {
+				printf("using store and forward mode\n");
+				DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_STORENFWD);
+			} else {
+				sc->dc_txthresh += 0x4000;
+				printf("increasing TX threshold\n");
+				CSR_WRITE_4(sc, DC_NETCFG, cfg);
+				DC_SETBIT(sc, DC_NETCFG, sc->dc_txthresh);
+				DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_STORENFWD);
+			}
+		}
+
+		if ((status & DC_ISR_RX_WATDOGTIMEO)
+		    || (status & DC_ISR_RX_NOBUF))
+			dc_rxeof(sc);
+
+		if (status & DC_ISR_BUS_ERR) {
+			dc_reset(sc);
+			dc_init(sc);
+		}
+	}
+
+	/* Re-enable interrupts. */
+	CSR_WRITE_4(sc, DC_IMR, DC_INTRS);
+
+	if (ifp->if_snd.ifq_head != NULL)
+		dc_start(ifp);
+
+	return claimed;
+}
+
+/*
+ * Encapsulate an mbuf chain in a descriptor by coupling the mbuf data
+ * pointers to the fragment pointers.
+ */
+int dc_encap(sc, m_head, txidx)
+	struct dc_softc		*sc;
+	struct mbuf		*m_head;
+	u_int32_t		*txidx;
+{
+	struct dc_desc		*f = NULL;
+	struct mbuf		*m;
+	int			frag, cur, cnt = 0;
+
+	/*
+ 	 * 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;
+	cur = frag = *txidx;
+
+	for (m = m_head; m != NULL; m = m->m_next) {
+		if (m->m_len != 0) {
+			if (sc->dc_flags & DC_TX_ADMTEK_WAR) {
+				if (*txidx != sc->dc_cdata.dc_tx_prod &&
+				    frag == (DC_TX_LIST_CNT - 1))
+					return(ENOBUFS);
+			}
+			if ((DC_TX_LIST_CNT -
+			    (sc->dc_cdata.dc_tx_cnt + cnt)) < 5)
+				return(ENOBUFS);
+
+			f = &sc->dc_ldata->dc_tx_list[frag];
+			f->dc_ctl = DC_TXCTL_TLINK | m->m_len;
+			if (cnt == 0) {
+				f->dc_status = 0;
+				f->dc_ctl |= DC_TXCTL_FIRSTFRAG;
+			} else
+				f->dc_status = DC_TXSTAT_OWN;
+			f->dc_data = vtophys(mtod(m, vm_offset_t));
+			cur = frag;
+			DC_INC(frag, DC_TX_LIST_CNT);
+			cnt++;
+		}
+	}
+
+	if (m != NULL)
+		return(ENOBUFS);
+
+	sc->dc_cdata.dc_tx_cnt += cnt;
+	sc->dc_cdata.dc_tx_chain[cur] = m_head;
+	sc->dc_ldata->dc_tx_list[cur].dc_ctl |= DC_TXCTL_LASTFRAG;
+	if (sc->dc_flags & DC_TX_INTR_FIRSTFRAG)
+		sc->dc_ldata->dc_tx_list[*txidx].dc_ctl |= DC_TXCTL_FINT;
+	if (sc->dc_flags & DC_TX_USE_TX_INTR && sc->dc_cdata.dc_tx_cnt > 64)
+		sc->dc_ldata->dc_tx_list[cur].dc_ctl |= DC_TXCTL_FINT;
+	sc->dc_ldata->dc_tx_list[*txidx].dc_status = DC_TXSTAT_OWN;
+	*txidx = frag;
+
+	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.
+ */
+
+void dc_start(ifp)
+	struct ifnet		*ifp;
+{
+	struct dc_softc		*sc;
+	struct mbuf		*m_head = NULL;
+	int			idx;
+
+	sc = ifp->if_softc;
+
+	if (!sc->dc_link)
+		return;
+
+	if (ifp->if_flags & IFF_OACTIVE)
+		return;
+
+	idx = sc->dc_cdata.dc_tx_prod;
+
+	while(sc->dc_cdata.dc_tx_chain[idx] == NULL) {
+		IF_DEQUEUE(&ifp->if_snd, m_head);
+		if (m_head == NULL)
+			break;
+
+		if (dc_encap(sc, m_head, &idx)) {
+			IF_PREPEND(&ifp->if_snd, m_head);
+			ifp->if_flags |= IFF_OACTIVE;
+			break;
+		}
+
+		/*
+		 * If there's a BPF listener, bounce a copy of this frame
+		 * to him.
+		 */
+#if NBPFILTER > 0
+		if (ifp->if_bpf)
+			bpf_mtap(ifp->if_bpf, m_head);
+#endif
+	}
+
+	/* Transmit */
+	sc->dc_cdata.dc_tx_prod = idx;
+	if (!(sc->dc_flags & DC_TX_POLL))
+		CSR_WRITE_4(sc, DC_TXSTART, 0xFFFFFFFF);
+
+	/*
+	 * Set a timeout in case the chip goes out to lunch.
+	 */
+	ifp->if_timer = 5;
+
+	return;
+}
+
+void dc_init(xsc)
+	void			*xsc;
+{
+	struct dc_softc		*sc = xsc;
+	struct ifnet		*ifp = &sc->arpcom.ac_if;
+	struct mii_data		*mii;
+	int			s;
+
+	s = splimp();
+
+	mii = &sc->sc_mii;
+
+	/*
+	 * Cancel pending I/O and free all RX/TX buffers.
+	 */
+	dc_stop(sc);
+	dc_reset(sc);
+
+	/*
+	 * Set cache alignment and burst length.
+	 */
+	if (DC_IS_ASIX(sc))
+		CSR_WRITE_4(sc, DC_BUSCTL, 0);
+	else
+		CSR_WRITE_4(sc, DC_BUSCTL, DC_BUSCTL_MRME|DC_BUSCTL_MRLE);
+	if (DC_IS_DAVICOM(sc) || DC_IS_INTEL(sc)) {
+		DC_SETBIT(sc, DC_BUSCTL, DC_BURSTLEN_USECA);
+	} else {
+		DC_SETBIT(sc, DC_BUSCTL, DC_BURSTLEN_16LONG);
+	}
+	if (sc->dc_flags & DC_TX_POLL)
+		DC_SETBIT(sc, DC_BUSCTL, DC_TXPOLL_1);
+	switch(sc->dc_cachesize) {
+	case 32:
+		DC_SETBIT(sc, DC_BUSCTL, DC_CACHEALIGN_32LONG);
+		break;
+	case 16:
+		DC_SETBIT(sc, DC_BUSCTL, DC_CACHEALIGN_16LONG);
+		break; 
+	case 8:
+		DC_SETBIT(sc, DC_BUSCTL, DC_CACHEALIGN_8LONG);
+		break;  
+	case 0:
+	default:
+		DC_SETBIT(sc, DC_BUSCTL, DC_CACHEALIGN_NONE);
+		break;
+	}
+
+	if (sc->dc_flags & DC_TX_STORENFWD)
+		DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_STORENFWD);
+	else {
+		if (sc->dc_txthresh == DC_TXTHRESH_160BYTES) {
+			DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_STORENFWD);
+		} else {
+			DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_STORENFWD);
+			DC_SETBIT(sc, DC_NETCFG, sc->dc_txthresh);
+		}
+	}
+
+	DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_NO_RXCRC);
+	DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_TX_BACKOFF);
+
+	if (DC_IS_MACRONIX(sc) || DC_IS_PNICII(sc)) {
+		/*
+		 * The app notes for the 98713 and 98715A say that
+		 * in order to have the chips operate properly, a magic
+		 * number must be written to CSR16. Macronix does not
+		 * document the meaning of these bits so there's no way
+		 * to know exactly what they do. The 98713 has a magic
+		 * number all its own; the rest all use a different one.
+		 */
+		DC_CLRBIT(sc, DC_MX_MAGICPACKET, 0xFFFF0000);
+		if (sc->dc_type == DC_TYPE_98713)
+			DC_SETBIT(sc, DC_MX_MAGICPACKET, DC_MX_MAGIC_98713);
+		else
+			DC_SETBIT(sc, DC_MX_MAGICPACKET, DC_MX_MAGIC_98715);
+	}
+
+	DC_CLRBIT(sc, DC_NETCFG, DC_NETCFG_TX_THRESH);
+	DC_SETBIT(sc, DC_NETCFG, DC_TXTHRESH_72BYTES);
+
+	/* Init circular RX list. */
+	if (dc_list_rx_init(sc) == ENOBUFS) {
+		printf("dc%d: initialization failed: no "
+		    "memory for rx buffers\n", sc->dc_unit);
+		dc_stop(sc);
+		(void)splx(s);
+		return;
+	}
+
+	/*
+	 * Init tx descriptors.
+	 */
+	dc_list_tx_init(sc);
+
+	/*
+	 * Load the address of the RX list.
+	 */
+	CSR_WRITE_4(sc, DC_RXADDR, vtophys(&sc->dc_ldata->dc_rx_list[0]));
+	CSR_WRITE_4(sc, DC_TXADDR, vtophys(&sc->dc_ldata->dc_tx_list[0]));
+
+	/*
+	 * Enable interrupts.
+	 */
+	CSR_WRITE_4(sc, DC_IMR, DC_INTRS);
+	CSR_WRITE_4(sc, DC_ISR, 0xFFFFFFFF);
+
+	/* Enable transmitter. */
+	DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_TX_ON);
+
+	/*
+	 * Load the RX/multicast filter. We do this sort of late
+	 * because the filter programming scheme on the 21143 and
+	 * some clones requires DMAing a setup frame via the TX
+	 * engine, and we need the transmitter enabled for that.
+	 */
+	dc_setfilt(sc);
+
+	/* Enable receiver. */
+	DC_SETBIT(sc, DC_NETCFG, DC_NETCFG_RX_ON);
+	CSR_WRITE_4(sc, DC_RXSTART, 0xFFFFFFFF);
+
+	mii_mediachg(mii);
+	dc_setcfg(sc, sc->dc_if_media);
+
+	ifp->if_flags |= IFF_RUNNING;
+	ifp->if_flags &= ~IFF_OACTIVE;
+
+	(void)splx(s);
+
+	timeout(dc_tick, sc, hz);
+
+	return;
+}
+
+/*
+ * Set media options.
+ */
+int dc_ifmedia_upd(ifp)
+	struct ifnet		*ifp;
+{
+	struct dc_softc		*sc;
+	struct mii_data		*mii;
+
+	sc = ifp->if_softc;
+	mii = &sc->sc_mii;
+	mii_mediachg(mii);
+	sc->dc_link = 0;
+
+	return(0);
+}
+
+/*
+ * Report current media status.
+ */
+void dc_ifmedia_sts(ifp, ifmr)
+	struct ifnet		*ifp;
+	struct ifmediareq	*ifmr;
+{
+	struct dc_softc		*sc;
+	struct mii_data		*mii;
+
+	sc = ifp->if_softc;
+	mii = &sc->sc_mii;
+	mii_pollstat(mii);
+	ifmr->ifm_active = mii->mii_media_active;
+	ifmr->ifm_status = mii->mii_media_status;
+
+	return;
+}
+
+int dc_ioctl(ifp, command, data)
+	struct ifnet		*ifp;
+	u_long			command;
+	caddr_t			data;
+{
+	struct dc_softc		*sc = ifp->if_softc;
+	struct ifreq		*ifr = (struct ifreq *) data;
+	struct ifaddr		*ifa = (struct ifaddr *)data;
+	struct mii_data		*mii;
+	int			s, error = 0;
+
+	s = splimp();
+
+	if ((error = ether_ioctl(ifp, &sc->arpcom, command, data)) > 0) {
+		splx(s);
+		return error;
+	}
+
+	switch(command) {
+	case SIOCSIFADDR:
+		ifp->if_flags |= IFF_UP;
+		switch (ifa->ifa_addr->sa_family) {
+		case AF_INET:
+			dc_init(sc);
+			arp_ifinit(&sc->arpcom, ifa);
+			break;
+		default:
+			dc_init(sc);
+			break;
+		}
+		break;
+	case SIOCSIFFLAGS:
+		if (ifp->if_flags & IFF_UP) {
+			if (ifp->if_flags & IFF_RUNNING &&
+			    ifp->if_flags & IFF_PROMISC &&
+			    !(sc->dc_if_flags & IFF_PROMISC)) {
+				dc_setfilt(sc);
+			} else if (ifp->if_flags & IFF_RUNNING &&
+			    !(ifp->if_flags & IFF_PROMISC) &&
+			    sc->dc_if_flags & IFF_PROMISC) {
+				dc_setfilt(sc);
+			} else if (!(ifp->if_flags & IFF_RUNNING)) {
+				sc->dc_txthresh = 0;
+				dc_init(sc);
+			}
+		} else {
+			if (ifp->if_flags & IFF_RUNNING)
+				dc_stop(sc);
+		}
+		sc->dc_if_flags = ifp->if_flags;
+		error = 0;
+		break;
+	case SIOCADDMULTI:
+	case SIOCDELMULTI:
+		dc_setfilt(sc);
+		error = 0;
+		break;
+	case SIOCGIFMEDIA:
+	case SIOCSIFMEDIA:
+		mii = &sc->sc_mii;
+		error = ifmedia_ioctl(ifp, ifr, &mii->mii_media, command);
+		break;
+	default:
+		error = EINVAL;
+		break;
+	}
+
+	(void)splx(s);
+
+	return(error);
+}
+
+void dc_watchdog(ifp)
+	struct ifnet		*ifp;
+{
+	struct dc_softc		*sc;
+
+	sc = ifp->if_softc;
+
+	ifp->if_oerrors++;
+	printf("dc%d: watchdog timeout\n", sc->dc_unit);
+
+	dc_stop(sc);
+	dc_reset(sc);
+	dc_init(sc);
+
+	if (ifp->if_snd.ifq_head != NULL)
+		dc_start(ifp);
+
+	return;
+}
+
+/*
+ * Stop the adapter and free any mbufs allocated to the
+ * RX and TX lists.
+ */
+void dc_stop(sc)
+	struct dc_softc		*sc;
+{
+	register int		i;
+	struct ifnet		*ifp;
+
+	ifp = &sc->arpcom.ac_if;
+	ifp->if_timer = 0;
+
+	untimeout(dc_tick, sc);
+
+	DC_CLRBIT(sc, DC_NETCFG, (DC_NETCFG_RX_ON|DC_NETCFG_TX_ON));
+	CSR_WRITE_4(sc, DC_IMR, 0x00000000);
+	CSR_WRITE_4(sc, DC_TXADDR, 0x00000000);
+	CSR_WRITE_4(sc, DC_RXADDR, 0x00000000);
+	sc->dc_link = 0;
+
+	/*
+	 * Free data in the RX lists.
+	 */
+	for (i = 0; i < DC_RX_LIST_CNT; i++) {
+		if (sc->dc_cdata.dc_rx_chain[i] != NULL) {
+			m_freem(sc->dc_cdata.dc_rx_chain[i]);
+			sc->dc_cdata.dc_rx_chain[i] = NULL;
+		}
+	}
+	bzero((char *)&sc->dc_ldata->dc_rx_list,
+		sizeof(sc->dc_ldata->dc_rx_list));
+
+	/*
+	 * Free the TX list buffers.
+	 */
+	for (i = 0; i < DC_TX_LIST_CNT; i++) {
+		if (sc->dc_cdata.dc_tx_chain[i] != NULL) {
+			if (sc->dc_ldata->dc_tx_list[i].dc_ctl &
+			    DC_TXCTL_SETUP) {
+				sc->dc_cdata.dc_tx_chain[i] = NULL;
+				continue;
+			}
+			m_freem(sc->dc_cdata.dc_tx_chain[i]);
+			sc->dc_cdata.dc_tx_chain[i] = NULL;
+		}
+	}
+
+	bzero((char *)&sc->dc_ldata->dc_tx_list,
+		sizeof(sc->dc_ldata->dc_tx_list));
+
+	ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
+
+	return;
+}
+
+/*
+ * Stop all chip I/O so that the kernel's probe routines don't
+ * get confused by errant DMAs when rebooting.
+ */
+void dc_shutdown(v)
+	void			*v;
+{
+	struct dc_softc		*sc = (struct dc_softc *)v;
+
+	dc_stop(sc);
+}
+
+struct cfattach dc_ca = {
+	sizeof(struct dc_softc), dc_probe, dc_attach
+};
+
+struct cfdriver dc_cd = {
+	0, "dc", DV_IFNET
+};
+
diff --git a/sys/dev/pci/if_dcreg.h b/sys/dev/pci/if_dcreg.h
new file mode 100644
index 00000000000..e5886512d50
--- /dev/null
+++ b/sys/dev/pci/if_dcreg.h
@@ -0,0 +1,911 @@
+/*	$OpenBSD: if_dcreg.h,v 1.1 1999/12/08 22:35:33 aaron Exp $ */
+/*
+ * Copyright (c) 1997, 1998, 1999
+ *	Bill Paul <wpaul@ee.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.
+ *
+ * $FreeBSD: src/sys/pci/if_dcreg.h,v 1.1 1999/12/04 17:41:07 wpaul Exp $
+ */
+
+/*
+ * 21143 and clone common register definitions.
+ */
+
+#define DC_BUSCTL		0x00	/* bus control */
+#define DC_TXSTART		0x08	/* tx start demand */
+#define DC_RXSTART		0x10	/* rx start demand */
+#define DC_RXADDR		0x18	/* rx descriptor list start addr */
+#define DC_TXADDR		0x20	/* tx descriptor list start addr */
+#define DC_ISR			0x28	/* interrupt status register */
+#define DC_NETCFG		0x30	/* network config register */
+#define DC_IMR			0x38	/* interrupt mask */
+#define DC_FRAMESDISCARDED	0x40	/* # of discarded frames */
+#define DC_SIO			0x48	/* MII and ROM/EEPROM access */
+#define DC_ROM			0x50	/* ROM programming address */
+#define DC_TIMER		0x58	/* general timer */
+#define DC_10BTSTAT		0x60	/* SIA status */
+#define DC_SIARESET		0x68	/* SIA connectivity */
+#define DC_10BTCTRL		0x70	/* SIA transmit and receive */
+#define DC_WATCHDOG		0x78	/* SIA and general purpose port */
+
+/*
+ * There are two general 'types' of MX chips that we need to be
+ * concerned with. One is the original 98713, which has its internal
+ * NWAY support controlled via the MDIO bits in the serial I/O
+ * register. The other is everything else (from the 98713A on up),
+ * which has its internal NWAY controlled via CSR13, CSR14 and CSR15,
+ * just like the 21143. This type setting also governs which of the
+ * 'magic' numbers we write to CSR16. The PNIC II falls into the
+ * 98713A/98715/98715A/98725 category.
+ */
+#define DC_TYPE_98713		0x1
+#define DC_TYPE_98713A		0x2
+#define DC_TYPE_987x5		0x3
+
+/* Other type of supported chips. */
+#define DC_TYPE_21143		0x4	/* Intel 21143 */
+#define DC_TYPE_ASIX		0x5	/* ASIX AX88140A/AX88141 */
+#define DC_TYPE_AL981		0x6	/* ADMtek AL981 Comet */
+#define DC_TYPE_AN985		0x7	/* ADMtek AN985 Centaur */
+#define DC_TYPE_DM9102		0x8	/* Davicom DM9102 */
+#define DC_TYPE_PNICII		0x9	/* 82c115 PNIC II */
+#define DC_TYPE_PNIC		0xA	/* 82c168/82c169 PNIC I */
+
+#define DC_IS_MACRONIX(x)			\
+	(x->dc_type == DC_TYPE_98713 ||		\
+	 x->dc_type == DC_TYPE_98713A ||	\
+	 x->dc_type == DC_TYPE_987x5)
+
+#define DC_IS_ADMTEK(x)				\
+	(x->dc_type == DC_TYPE_AL981 ||		\
+	 x->dc_type == DC_TYPE_AN985)
+
+#define DC_IS_INTEL(x)		(x->dc_type == DC_TYPE_21143)
+#define DC_IS_ASIX(x)		(x->dc_type == DC_TYPE_ASIX)
+#define DC_IS_COMET(x)		(x->dc_type == DC_TYPE_AL981)
+#define DC_IS_CENTAUR(x)	(x->dc_type == DC_TYPE_AN985)
+#define DC_IS_DAVICOM(x)	(x->dc_type == DC_TYPE_DM9102)
+#define DC_IS_PNICII(x)		(x->dc_type == DC_TYPE_PNICII)
+#define DC_IS_PNIC(x)		(x->dc_type == DC_TYPE_PNIC)
+
+/* MII/symbol mode port types */
+#define DC_PMODE_MII		0x1
+#define DC_PMODE_SYM		0x2
+
+/*
+ * Bus control bits.
+ */
+#define DC_BUSCTL_RESET		0x00000001
+#define DC_BUSCTL_ARBITRATION	0x00000002
+#define DC_BUSCTL_SKIPLEN	0x0000007C
+#define DC_BUSCTL_BUF_BIGENDIAN	0x00000080
+#define DC_BUSCTL_BURSTLEN	0x00003F00
+#define DC_BUSCTL_CACHEALIGN	0x0000C000
+#define DC_BUSCTL_TXPOLL	0x000E0000
+#define DC_BUSCTL_DBO		0x00100000
+#define DC_BUSCTL_MRME		0x00200000
+#define DC_BUSCTL_MRLE		0x00800000
+#define DC_BUSCTL_MWIE		0x01000000
+#define DC_BUSCTL_ONNOW_ENB	0x04000000
+
+#define DC_SKIPLEN_1LONG	0x00000004
+#define DC_SKIPLEN_2LONG	0x00000008
+#define DC_SKIPLEN_3LONG	0x00000010
+#define DC_SKIPLEN_4LONG	0x00000020
+#define DC_SKIPLEN_5LONG	0x00000040
+
+#define DC_CACHEALIGN_NONE	0x00000000
+#define DC_CACHEALIGN_8LONG	0x00004000
+#define DC_CACHEALIGN_16LONG	0x00008000
+#define DC_CACHEALIGN_32LONG	0x0000C000
+
+#define DC_BURSTLEN_USECA	0x00000000
+#define DC_BURSTLEN_1LONG	0x00000100
+#define DC_BURSTLEN_2LONG	0x00000200
+#define DC_BURSTLEN_4LONG	0x00000400
+#define DC_BURSTLEN_8LONG	0x00000800
+#define DC_BURSTLEN_16LONG	0x00001000
+#define DC_BURSTLEN_32LONG	0x00002000
+
+#define DC_TXPOLL_OFF		0x00000000
+#define DC_TXPOLL_1		0x00020000
+#define DC_TXPOLL_2		0x00040000
+#define DC_TXPOLL_3		0x00060000
+#define DC_TXPOLL_4		0x00080000
+#define DC_TXPOLL_5		0x000A0000
+#define DC_TXPOLL_6		0x000C0000
+#define DC_TXPOLL_7		0x000E0000
+
+/*
+ * Interrupt status bits.
+ */
+#define DC_ISR_TX_OK		0x00000001
+#define DC_ISR_TX_IDLE		0x00000002
+#define DC_ISR_TX_NOBUF		0x00000004
+#define DC_ISR_TX_JABBERTIMEO	0x00000008
+#define DC_ISR_LINKGOOD		0x00000010
+#define DC_ISR_TX_UNDERRUN	0x00000020
+#define DC_ISR_RX_OK		0x00000040
+#define DC_ISR_RX_NOBUF		0x00000080
+#define DC_ISR_RX_READ		0x00000100
+#define DC_ISR_RX_WATDOGTIMEO	0x00000200
+#define DC_ISR_TX_EARLY		0x00000400
+#define DC_ISR_TIMER_EXPIRED	0x00000800
+#define DC_ISR_LINKFAIL		0x00001000
+#define DC_ISR_BUS_ERR		0x00002000
+#define DC_ISR_RX_EARLY		0x00004000
+#define DC_ISR_ABNORMAL		0x00008000
+#define DC_ISR_NORMAL		0x00010000
+#define DC_ISR_RX_STATE		0x000E0000
+#define DC_ISR_TX_STATE		0x00700000
+#define DC_ISR_BUSERRTYPE	0x03800000
+#define DC_ISR_100MBPSLINK	0x08000000
+#define DC_ISR_MAGICKPACK	0x10000000
+
+#define DC_RXSTATE_STOPPED	0x00000000	/* 000 - Stopped */
+#define DC_RXSTATE_FETCH	0x00020000	/* 001 - Fetching descriptor */
+#define DC_RXSTATE_ENDCHECK	0x00040000	/* 010 - check for rx end */
+#define DC_RXSTATE_WAIT		0x00060000	/* 011 - waiting for packet */
+#define DC_RXSTATE_SUSPEND	0x00080000	/* 100 - suspend rx */
+#define DC_RXSTATE_CLOSE	0x000A0000	/* 101 - close tx desc */
+#define DC_RXSTATE_FLUSH	0x000C0000	/* 110 - flush from FIFO */
+#define DC_RXSTATE_DEQUEUE	0x000E0000	/* 111 - dequeue from FIFO */
+
+#define DC_TXSTATE_RESET	0x00000000	/* 000 - reset */
+#define DC_TXSTATE_FETCH	0x00100000	/* 001 - fetching descriptor */
+#define DC_TXSTATE_WAITEND	0x00200000	/* 010 - wait for tx end */
+#define DC_TXSTATE_READING	0x00300000	/* 011 - read and enqueue */
+#define DC_TXSTATE_RSVD		0x00400000	/* 100 - reserved */
+#define DC_TXSTATE_SETUP	0x00500000	/* 101 - setup packet */
+#define DC_TXSTATE_SUSPEND	0x00600000	/* 110 - suspend tx */
+#define DC_TXSTATE_CLOSE	0x00700000	/* 111 - close tx desc */
+
+/*
+ * Network config bits.
+ */
+#define DC_NETCFG_RX_HASHPERF	0x00000001
+#define DC_NETCFG_RX_ON		0x00000002
+#define DC_NETCFG_RX_HASHONLY	0x00000004
+#define DC_NETCFG_RX_BADFRAMES	0x00000008
+#define DC_NETCFG_RX_INVFILT	0x00000010
+#define DC_NETCFG_BACKOFFCNT	0x00000020
+#define DC_NETCFG_RX_PROMISC	0x00000040
+#define DC_NETCFG_RX_ALLMULTI	0x00000080
+#define DC_NETCFG_FULLDUPLEX	0x00000200
+#define DC_NETCFG_LOOPBACK	0x00000C00
+#define DC_NETCFG_FORCECOLL	0x00001000
+#define DC_NETCFG_TX_ON		0x00002000
+#define DC_NETCFG_TX_THRESH	0x0000C000
+#define DC_NETCFG_TX_BACKOFF	0x00020000
+#define DC_NETCFG_PORTSEL	0x00040000	/* 0 == 10, 1 == 100 */
+#define DC_NETCFG_HEARTBEAT	0x00080000
+#define DC_NETCFG_STORENFWD	0x00200000
+#define DC_NETCFG_SPEEDSEL	0x00400000	/* 1 == 10, 0 == 100 */
+#define DC_NETCFG_PCS		0x00800000
+#define DC_NETCFG_SCRAMBLER	0x01000000
+#define DC_NETCFG_NO_RXCRC	0x02000000
+#define DC_NETCFG_RX_ALL	0x40000000
+#define DC_NETCFG_CAPEFFECT	0x80000000
+
+#define DC_OPMODE_NORM		0x00000000
+#define DC_OPMODE_INTLOOP	0x00000400
+#define DC_OPMODE_EXTLOOP	0x00000800
+
+#define DC_TXTHRESH_72BYTES	0x00000000
+#define DC_TXTHRESH_96BYTES	0x00004000
+#define DC_TXTHRESH_128BYTES	0x00008000
+#define DC_TXTHRESH_160BYTES	0x0000C000
+
+
+/*
+ * Interrupt mask bits.
+ */
+#define DC_IMR_TX_OK		0x00000001
+#define DC_IMR_TX_IDLE		0x00000002
+#define DC_IMR_TX_NOBUF		0x00000004
+#define DC_IMR_TX_JABBERTIMEO	0x00000008
+#define DC_IMR_LINKGOOD		0x00000010
+#define DC_IMR_TX_UNDERRUN	0x00000020
+#define DC_IMR_RX_OK		0x00000040
+#define DC_IMR_RX_NOBUF		0x00000080
+#define DC_IMR_RX_READ		0x00000100
+#define DC_IMR_RX_WATDOGTIMEO	0x00000200
+#define DC_IMR_TX_EARLY		0x00000400
+#define DC_IMR_TIMER_EXPIRED	0x00000800
+#define DC_IMR_LINKFAIL		0x00001000
+#define DC_IMR_BUS_ERR		0x00002000
+#define DC_IMR_RX_EARLY		0x00004000
+#define DC_IMR_ABNORMAL		0x00008000
+#define DC_IMR_NORMAL		0x00010000
+#define DC_IMR_100MBPSLINK	0x08000000
+#define DC_IMR_MAGICKPACK	0x10000000
+
+#define DC_INTRS	\
+	(DC_IMR_RX_OK|DC_IMR_TX_OK|DC_IMR_RX_NOBUF|DC_IMR_RX_WATDOGTIMEO|\
+	DC_IMR_TX_NOBUF|DC_IMR_TX_UNDERRUN|DC_IMR_BUS_ERR|		\
+	DC_IMR_ABNORMAL|DC_IMR_NORMAL/*|DC_IMR_TX_EARLY*/)
+/*
+ * Serial I/O (EEPROM/ROM) bits.
+ */
+#define DC_SIO_EE_CS		0x00000001	/* EEPROM chip select */
+#define DC_SIO_EE_CLK		0x00000002	/* EEPROM clock */
+#define DC_SIO_EE_DATAIN	0x00000004	/* EEPROM data output */
+#define DC_SIO_EE_DATAOUT	0x00000008	/* EEPROM data input */
+#define DC_SIO_ROMDATA4		0x00000010
+#define DC_SIO_ROMDATA5		0x00000020
+#define DC_SIO_ROMDATA6		0x00000040
+#define DC_SIO_ROMDATA7		0x00000080
+#define DC_SIO_EESEL		0x00000800
+#define DC_SIO_ROMSEL		0x00001000
+#define DC_SIO_ROMCTL_WRITE	0x00002000
+#define DC_SIO_ROMCTL_READ	0x00004000
+#define DC_SIO_MII_CLK		0x00010000	/* MDIO clock */
+#define DC_SIO_MII_DATAOUT	0x00020000	/* MDIO data out */
+#define DC_SIO_MII_DIR		0x00040000	/* MDIO dir */
+#define DC_SIO_MII_DATAIN	0x00080000	/* MDIO data in */
+
+#define DC_EECMD_WRITE		0x140
+#define DC_EECMD_READ		0x180
+#define DC_EECMD_ERASE		0x1c0
+
+#define DC_EE_NODEADDR_OFFSET	0x70
+#define DC_EE_NODEADDR		10
+
+/*
+ * General purpose timer register
+ */
+#define DC_TIMER_VALUE		0x0000FFFF
+#define DC_TIMER_CONTINUOUS	0x00010000
+
+/*
+ * 10baseT status register
+ */
+#define DC_TSTAT_MIIACT		0x00000001 /* MII port activity */
+#define DC_TSTAT_LS100		0x00000002 /* link status of 100baseTX */
+#define DC_TSTAT_LS10		0x00000004 /* link status of 10baseT */
+#define DC_TSTAT_AUTOPOLARITY	0x00000008
+#define DC_TSTAT_AUIACT		0x00000100 /* AUI activity */
+#define DC_TSTAT_10BTACT	0x00000200 /* 10baseT activity */
+#define DC_TSTAT_NSN		0x00000400 /* non-stable FLPs detected */
+#define DC_TSTAT_REMFAULT	0x00000800
+#define DC_TSTAT_ANEGSTAT	0x00007000
+#define DC_TSTAT_LP_CAN_NWAY	0x00008000 /* link partner supports NWAY */
+#define DC_TSTAT_LPCODEWORD	0xFFFF0000 /* link partner's code word */
+
+#define DC_ASTAT_DISABLE	0x00000000
+#define DC_ASTAT_TXDISABLE	0x00001000
+#define DC_ASTAT_ABDETECT	0x00002000
+#define DC_ASTAT_ACKDETECT	0x00003000
+#define DC_ASTAT_CMPACKDETECT	0x00004000
+#define DC_ASTAT_AUTONEGCMP	0x00005000
+#define DC_ASTAT_LINKCHECK	0x00006000
+
+/*
+ * PHY reset register
+ */
+#define DC_SIA_RESET		0x00000001
+#define DC_SIA_AUI		0x00000008 /* AUI or 10baseT */
+
+/*
+ * 10baseT control register
+ */
+#define DC_TCTL_ENCODER_ENB	0x00000001
+#define DC_TCTL_LOOPBACK	0x00000002
+#define DC_TCTL_DRIVER_ENB	0x00000004
+#define DC_TCTL_LNKPULSE_ENB	0x00000008
+#define DC_TCTL_HALFDUPLEX	0x00000040
+#define DC_TCTL_AUTONEGENBL	0x00000080
+#define DC_TCTL_RX_SQUELCH	0x00000100
+#define DC_TCTL_COLL_SQUELCH	0x00000200
+#define DC_TCTL_COLL_DETECT	0x00000400
+#define DC_TCTL_SQE_ENB		0x00000800
+#define DC_TCTL_LINKTEST	0x00001000
+#define DC_TCTL_AUTOPOLARITY	0x00002000
+#define DC_TCTL_SET_POL_PLUS	0x00004000
+#define DC_TCTL_AUTOSENSE	0x00008000	/* 10bt/AUI autosense */
+#define DC_TCTL_100BTXHALF	0x00010000
+#define DC_TCTL_100BTXFULL	0x00020000
+#define DC_TCTL_100BT4		0x00040000
+
+/*
+ * Watchdog timer register
+ */
+#define DC_WDOG_JABBERDIS	0x00000001
+#define DC_WDOG_HOSTUNJAB	0x00000002
+#define DC_WDOG_JABBERCLK	0x00000004
+#define DC_WDOG_RXWDOGDIS	0x00000010
+#define DC_WDOG_RXWDOGCLK	0x00000020
+#define DC_WDOG_MUSTBEZERO	0x00000100
+
+/*
+ * Size of a setup frame.
+ */
+#define DC_SFRAME_LEN		192
+
+/*
+ * 21x4x TX/RX list structure.
+ */
+
+struct dc_desc {
+	u_int32_t		dc_status;
+	u_int32_t		dc_ctl;
+	u_int32_t		dc_ptr1;
+	u_int32_t		dc_ptr2;
+};
+
+#define dc_data		dc_ptr1
+#define dc_next		dc_ptr2
+
+#define DC_RXSTAT_FIFOOFLOW	0x00000001
+#define DC_RXSTAT_CRCERR	0x00000002
+#define DC_RXSTAT_DRIBBLE	0x00000004
+#define DC_RXSTAT_WATCHDOG	0x00000010
+#define DC_RXSTAT_FRAMETYPE	0x00000020	/* 0 == IEEE 802.3 */
+#define DC_RXSTAT_COLLSEEN	0x00000040
+#define DC_RXSTAT_GIANT		0x00000080
+#define DC_RXSTAT_LASTFRAG	0x00000100
+#define DC_RXSTAT_FIRSTFRAG	0x00000200
+#define DC_RXSTAT_MULTICAST	0x00000400
+#define DC_RXSTAT_RUNT		0x00000800
+#define DC_RXSTAT_RXTYPE	0x00003000
+#define DC_RXSTAT_RXERR		0x00008000
+#define DC_RXSTAT_RXLEN		0x3FFF0000
+#define DC_RXSTAT_OWN		0x80000000
+
+#define DC_RXBYTES(x)		((x & DC_RXSTAT_RXLEN) >> 16)
+#define DC_RXSTAT (DC_RXSTAT_FIRSTFRAG|DC_RXSTAT_LASTFRAG|DC_RXSTAT_OWN)
+
+#define DC_RXCTL_BUFLEN1	0x00000FFF
+#define DC_RXCTL_BUFLEN2	0x00FFF000
+#define DC_RXCTL_RLINK		0x01000000
+#define DC_RXCTL_RLAST		0x02000000
+
+#define DC_TXSTAT_DEFER		0x00000001
+#define DC_TXSTAT_UNDERRUN	0x00000002
+#define DC_TXSTAT_LINKFAIL	0x00000003
+#define DC_TXSTAT_COLLCNT	0x00000078
+#define DC_TXSTAT_SQE		0x00000080
+#define DC_TXSTAT_EXCESSCOLL	0x00000100
+#define DC_TXSTAT_LATECOLL	0x00000200
+#define DC_TXSTAT_NOCARRIER	0x00000400
+#define DC_TXSTAT_CARRLOST	0x00000800
+#define DC_TXSTAT_JABTIMEO	0x00004000
+#define DC_TXSTAT_ERRSUM	0x00008000
+#define DC_TXSTAT_OWN		0x80000000
+
+#define DC_TXCTL_BUFLEN1	0x000007FF
+#define DC_TXCTL_BUFLEN2	0x003FF800
+#define DC_TXCTL_FILTTYPE0	0x00400000
+#define DC_TXCTL_PAD		0x00800000
+#define DC_TXCTL_TLINK		0x01000000
+#define DC_TXCTL_TLAST		0x02000000
+#define DC_TXCTL_NOCRC		0x04000000
+#define DC_TXCTL_SETUP		0x08000000
+#define DC_TXCTL_FILTTYPE1	0x10000000
+#define DC_TXCTL_FIRSTFRAG	0x20000000
+#define DC_TXCTL_LASTFRAG	0x40000000
+#define DC_TXCTL_FINT		0x80000000
+
+#define DC_FILTER_PERFECT	0x00000000
+#define DC_FILTER_HASHPERF	0x00400000
+#define DC_FILTER_INVERSE	0x10000000
+#define DC_FILTER_HASHONLY	0x10400000
+
+#define DC_MAXFRAGS		16
+#define DC_RX_LIST_CNT		64
+#define DC_TX_LIST_CNT		256
+#define DC_MIN_FRAMELEN		60
+#define DC_RXLEN		1536
+
+#define DC_INC(x, y)	(x) = (x + 1) % y
+
+struct dc_list_data {
+	struct dc_desc		dc_rx_list[DC_RX_LIST_CNT];
+	struct dc_desc		dc_tx_list[DC_TX_LIST_CNT];
+};
+
+struct dc_chain_data {
+	struct mbuf		*dc_rx_chain[DC_RX_LIST_CNT];
+	struct mbuf		*dc_tx_chain[DC_TX_LIST_CNT];
+	u_int32_t		dc_sbuf[DC_SFRAME_LEN/sizeof(u_int32_t)];
+	u_int8_t		dc_pad[DC_MIN_FRAMELEN];
+	int			dc_tx_prod;
+	int			dc_tx_cons;
+	int			dc_tx_cnt;
+	int			dc_rx_prod;
+};
+
+struct dc_type {
+	u_int16_t		dc_vid;
+	u_int16_t		dc_did;
+	char			*dc_name;
+};
+
+struct dc_mii_frame {
+	u_int8_t		mii_stdelim;
+	u_int8_t		mii_opcode;
+	u_int8_t		mii_phyaddr;
+	u_int8_t		mii_regaddr;
+	u_int8_t		mii_turnaround;
+	u_int16_t		mii_data;
+};
+
+/*
+ * MII constants
+ */
+#define DC_MII_STARTDELIM	0x01
+#define DC_MII_READOP		0x02
+#define DC_MII_WRITEOP		0x01
+#define DC_MII_TURNAROUND	0x02
+
+
+/*
+ * Registers specific to clone devices.
+ * This mainly relates to RX filter programming: not all 21x4x clones
+ * use the standard DEC filter programming mechanism.
+ */
+
+/*
+ * ADMtek specific registers and constants for the AL981 and AN985.
+ * The AN985 doesn't use the magic PHY registers.
+ */
+#define DC_AL_PAR0		0xA4	/* station address */
+#define DC_AL_PAR1		0xA8	/* station address */
+#define DC_AL_MAR0		0xAC	/* multicast hash filter */
+#define DC_AL_MAR1		0xB0	/* multicast hash filter */
+#define DC_AL_BMCR		0xB4	/* built in PHY control */
+#define DC_AL_BMSR		0xB8	/* built in PHY status */
+#define DC_AL_VENID		0xBC	/* built in PHY ID0 */
+#define DC_AL_DEVID		0xC0	/* built in PHY ID1 */
+#define DC_AL_ANAR		0xC4	/* built in PHY autoneg advert */
+#define DC_AL_LPAR		0xC8	/* bnilt in PHY link part. ability */
+#define DC_AL_ANER		0xCC	/* built in PHY autoneg expansion */
+
+#define DC_ADMTEK_PHYADDR	0x1
+#define DC_AL_EE_NODEADDR	4
+/* End of ADMtek specific registers */
+
+/*
+ * ASIX specific registers.
+ */
+#define DC_AX_FILTIDX		0x68    /* RX filter index */
+#define DC_AX_FILTDATA		0x70    /* RX filter data */
+
+/*
+ * Special ASIX-specific bits in the ASIX NETCFG register (CSR6).
+ */
+#define DC_AX_NETCFG_RX_BROAD	0x00000100 
+
+/*
+ * RX Filter Index Register values
+ */
+#define DC_AX_FILTIDX_PAR0	0x00000000
+#define DC_AX_FILTIDX_PAR1	0x00000001
+#define DC_AX_FILTIDX_MAR0	0x00000002
+#define DC_AX_FILTIDX_MAR1	0x00000003
+/* End of ASIX specific registers */
+
+/*
+ * Macronix specific registers. The Macronix chips have a special
+ * register for reading the NWAY status, which we don't use, plus
+ * a magic packet register, which we need to tweak a bit per the
+ * Macronix application notes.
+ */
+#define DC_MX_MAGICPACKET	0x80
+#define DC_MX_NWAYSTAT		0xA0
+
+/*
+ * Magic packet register
+ */
+#define DC_MX_MPACK_DISABLE	0x00400000
+
+/*
+ * NWAY status register.
+ */
+#define DC_MX_NWAY_10BTHALF	0x08000000
+#define DC_MX_NWAY_10BTFULL	0x10000000
+#define DC_MX_NWAY_100BTHALF	0x20000000
+#define DC_MX_NWAY_100BTFULL	0x40000000
+#define DC_MX_NWAY_100BT4	0x80000000
+
+/*
+ * These are magic values that must be written into CSR16
+ * (DC_MX_MAGICPACKET) in order to put the chip into proper
+ * operating mode. The magic numbers are documented in the
+ * Macronix 98715 application notes.
+ */
+#define DC_MX_MAGIC_98713	0x0F370000
+#define DC_MX_MAGIC_98713A	0x0B3C0000
+#define DC_MX_MAGIC_98715	0x0B3C0000
+#define DC_MX_MAGIC_98725	0x0B3C0000
+/* End of Macronix specific registers */
+
+/*
+ * PNIC 82c168/82c169 specific registers.
+ * The PNIC has its own special NWAY support, which doesn't work,
+ * and shortcut ways of reading the EEPROM and MII bus.
+ */
+#define DC_PN_GPIO		0x60	/* general purpose pins control */
+#define DC_PN_PWRUP_CFG		0x90	/* config register, set by EEPROM */
+#define DC_PN_SIOCTL		0x98	/* serial EEPROM control register */
+#define DC_PN_MII		0xA0	/* MII access register */
+#define DC_PN_NWAY		0xB8	/* Internal NWAY register */
+
+/* Serial I/O EEPROM register */
+#define DC_PN_SIOCTL_DATA	0x0000003F
+#define DC_PN_SIOCTL_OPCODE	0x00000300
+#define DC_PN_SIOCTL_BUSY	0x80000000
+
+#define DC_PN_EEOPCODE_ERASE	0x00000300
+#define DC_PN_EEOPCODE_READ	0x00000600
+#define DC_PN_EEOPCODE_WRITE	0x00000100
+
+/*
+ * The first two general purpose pins control speed selection and
+ * 100Mbps loopback on the 82c168 chip. The control bits should always
+ * be set (to make the data pins outputs) and the speed selction and
+ * loopback bits set accordingly when changing media. Physically, this
+ * will set the state of a relay mounted on the card.
+ */
+#define DC_PN_GPIO_DATA0	0x000000001
+#define DC_PN_GPIO_DATA1	0x000000002
+#define DC_PN_GPIO_DATA2	0x000000004
+#define DC_PN_GPIO_DATA3	0x000000008
+#define DC_PN_GPIO_CTL0		0x000000010
+#define DC_PN_GPIO_CTL1		0x000000020
+#define DC_PN_GPIO_CTL2		0x000000040
+#define DC_PN_GPIO_CTL3		0x000000080
+#define DC_PN_GPIO_SPEEDSEL	DC_PN_GPIO_DATA0/* 1 == 100Mbps, 0 == 10Mbps */
+#define DC_PN_GPIO_100TX_LOOP	DC_PN_GPIO_DATA1/* 1 == normal, 0 == loop */
+#define DC_PN_GPIO_BNC_ENB	DC_PN_GPIO_DATA2
+#define DC_PN_GPIO_100TX_LNK	DC_PN_GPIO_DATA3
+#define DC_PN_GPIO_SETBIT(sc, r)			\
+	DC_SETBIT(sc, DC_PN_GPIO, ((r) | (r << 4)))
+#define DC_PN_GPIO_CLRBIT(sc, r)			\
+	{						\
+		DC_SETBIT(sc, DC_PN_GPIO, ((r) << 4));	\
+		DC_CLRBIT(sc, DC_PN_GPIO, (r));		\
+	}
+	
+/* shortcut MII access register */
+#define DC_PN_MII_DATA		0x0000FFFF
+#define DC_PN_MII_RESERVER	0x00020000
+#define DC_PN_MII_REGADDR	0x007C0000
+#define DC_PN_MII_PHYADDR	0x0F800000
+#define DC_PN_MII_OPCODE	0x30000000
+#define DC_PN_MII_BUSY		0x80000000
+
+#define DC_PN_MIIOPCODE_READ	0x60020000
+#define DC_PN_MIIOPCODE_WRITE	0x50020000
+
+/* Internal NWAY bits */
+#define DC_PN_NWAY_RESET	0x00000001	/* reset */
+#define DC_PN_NWAY_PDOWN	0x00000002	/* power down */
+#define DC_PN_NWAY_BYPASS	0x00000004	/* bypass */
+#define DC_PN_NWAY_AUILOWCUR	0x00000008	/* AUI low current */
+#define DC_PN_NWAY_TPEXTEND	0x00000010	/* low squelch voltage */
+#define DC_PN_NWAY_POLARITY	0x00000020	/* 0 == on, 1 == off */
+#define DC_PN_NWAY_TP		0x00000040	/* 1 == tp, 0 == AUI */
+#define DC_PN_NWAY_AUIVOLT	0x00000080	/* 1 == full, 0 == half */
+#define DC_PN_NWAY_DUPLEX	0x00000100	/* LED, 1 == full, 0 == half */
+#define DC_PN_NWAY_LINKTEST	0x00000200	/* 0 == on, 1 == off */
+#define DC_PN_NWAY_AUTODETECT	0x00000400	/* 1 == off, 0 == on */
+#define DC_PN_NWAY_SPEEDSEL	0x00000800	/* LED, 0 = 10, 1 == 100 */
+#define DC_PN_NWAY_NWAY_ENB	0x00001000	/* 0 == off, 1 == on */
+#define DC_PN_NWAY_CAP10HDX	0x00002000
+#define DC_PN_NWAY_CAP10FDX	0x00004000
+#define DC_PN_NWAY_CAP100FDX	0x00008000
+#define DC_PN_NWAY_CAP100HDX	0x00010000
+#define DC_PN_NWAY_CAP100T4	0x00020000
+#define DC_PN_NWAY_ANEGRESTART	0x02000000	/* resets when aneg done */
+#define DC_PN_NWAY_REMFAULT	0x04000000
+#define DC_PN_NWAY_LPAR10HDX	0x08000000
+#define DC_PN_NWAY_LPAR10FDX	0x10000000
+#define DC_PN_NWAY_LPAR100FDX	0x20000000
+#define DC_PN_NWAY_LPAR100HDX	0x40000000
+#define DC_PN_NWAY_LPAR100T4	0x80000000
+
+/* End of PNIC specific registers */
+
+struct dc_softc {
+	struct device		sc_dev;
+	void			*sc_ih;
+	struct arpcom		arpcom;		/* interface info */
+	mii_data_t		sc_mii;
+	bus_space_handle_t	dc_bhandle;	/* bus space handle */
+	bus_space_tag_t		dc_btag;	/* bus space tag */
+	void			*dc_intrhand;
+	struct resource		*dc_irq;
+	struct resource		*dc_res;
+	struct dc_type		*dc_info;	/* adapter info */
+	u_int8_t		dc_unit;	/* interface number */
+	u_int8_t		dc_type;
+	u_int8_t		dc_pmode;
+	u_int8_t		dc_link;
+	u_int8_t		dc_cachesize;
+	int			dc_pnic_rx_bug_save;
+	unsigned char		*dc_pnic_rx_buf;
+	int			dc_if_flags;
+	int			dc_if_media;
+	u_int32_t		dc_flags;
+	u_int32_t		dc_txthresh;
+	struct dc_list_data	*dc_ldata;
+	caddr_t			dc_ldata_ptr;
+	struct dc_chain_data	dc_cdata;
+};
+
+#define DC_TX_POLL		0x00000001
+#define DC_TX_COALESCE		0x00000002
+#define DC_TX_ADMTEK_WAR	0x00000004
+#define DC_TX_USE_TX_INTR	0x00000008
+#define DC_RX_FILTER_TULIP	0x00000010
+#define DC_TX_INTR_FIRSTFRAG	0x00000020
+#define DC_PNIC_RX_BUG_WAR	0x00000040
+#define DC_TX_FIXED_RING	0x00000080
+#define DC_TX_STORENFWD		0x00000100
+#define DC_REDUCED_MII_POLL	0x00000200
+
+/*
+ * register space access macros
+ */
+#define CSR_WRITE_4(sc, reg, val)	\
+	bus_space_write_4(sc->dc_btag, sc->dc_bhandle, reg, val)
+
+#define CSR_READ_4(sc, reg)		\
+	bus_space_read_4(sc->dc_btag, sc->dc_bhandle, reg)
+
+#define DC_TIMEOUT		1000
+#define ETHER_ALIGN		2
+
+/*
+ * General constants that are fun to know.
+ */
+
+/*
+ * DEC PCI vendor ID
+ */
+#define DC_VENDORID_DEC		0x1011
+
+/*
+ * DEC/Intel 21143 PCI device ID
+ */
+#define DC_DEVICEID_21143	0x0019
+
+/*
+ * Macronix PCI vendor ID
+ */
+#define	DC_VENDORID_MX		0x10D9
+
+/*
+ * Macronix PMAC device IDs.
+ */
+#define DC_DEVICEID_98713	0x0512
+#define DC_DEVICEID_987x5	0x0531
+
+/* Macronix PCI revision codes. */
+#define DC_REVISION_98713	0x00
+#define DC_REVISION_98713A	0x10
+#define DC_REVISION_98715	0x20
+#define DC_REVISION_98725	0x30
+
+/*
+ * Compex PCI vendor ID.
+ */
+#define DC_VENDORID_CP		0x11F6
+
+/*
+ * Compex PMAC PCI device IDs.
+ */
+#define DC_DEVICEID_98713_CP	0x9881
+
+/*
+ * Lite-On PNIC PCI vendor ID
+ */
+#define DC_VENDORID_LO		0x11AD
+
+/*
+ * 82c168/82c169 PNIC device IDs. Both chips have the same device
+ * ID but different revisions. Revision 0x10 is the 82c168, and
+ * 0x20 is the 82c169.
+ */
+#define DC_DEVICEID_82C168	0x0002
+
+#define DC_REVISION_82C168	0x10
+#define DC_REVISION_82C169	0x20
+
+/* 
+ * Lite-On PNIC II device ID. Note: this is actually a Macronix 98715A
+ * with wake on lan/magic packet support.
+ */
+#define DC_DEVICEID_82C115	0xc115
+
+/*
+ * Davicom vendor ID.
+ */
+#define DC_VENDORID_DAVICOM	0x1282
+
+/*
+ * Davicom device IDs.
+ */
+#define DC_DEVICEID_DM9100	0x9100
+#define DC_DEVICEID_DM9102	0x9102
+
+/*
+ * ADMtek vendor ID.
+ */
+#define DC_VENDORID_ADMTEK	0x1317
+
+/*
+ * ADMtek device IDs.
+ */
+#define DC_DEVICEID_AL981	0x0981
+#define DC_DEVICEID_AN985	0x0985
+
+/*
+ * ASIX vendor ID.
+ */
+#define DC_VENDORID_ASIX	0x125B
+
+/*
+ * ASIX device IDs.
+ */
+#define DC_DEVICEID_AX88140A	0x1400
+
+/*
+ * The ASIX AX88140 and ASIX AX88141 have the same vendor and
+ * device IDs but different revision values.
+ */
+#define DC_REVISION_88140	0x00
+#define DC_REVISION_88141	0x10
+
+/*
+ * PCI low memory base and low I/O base register, and
+ * other PCI registers.
+ */
+
+#define DC_PCI_CFID		0x00	/* Id */
+#define DC_PCI_CFCS		0x04	/* Command and status */
+#define DC_PCI_CFRV		0x08	/* Revision */
+#define DC_PCI_CFLT		0x0C	/* Latency timer */
+#define DC_PCI_CFBIO		0x10	/* Base I/O address */
+#define DC_PCI_CFBMA		0x14	/* Base memory address */
+#define DC_PCI_CCIS		0x28	/* Card info struct */
+#define DC_PCI_CSID		0x2C	/* Subsystem ID */
+#define DC_PCI_CBER		0x30	/* Expansion ROM base address */
+#define DC_PCI_CCAP		0x34	/* Caps pointer - PD/TD chip only */
+#define DC_PCI_CFIT		0x3C	/* Interrupt */
+#define DC_PCI_CFDD		0x40	/* Device and driver area */
+#define DC_PCI_CWUA0		0x44	/* Wake-Up LAN addr 0 */
+#define DC_PCI_CWUA1		0x48	/* Wake-Up LAN addr 1 */
+#define DC_PCI_SOP0		0x4C	/* SecureON passwd 0 */
+#define DC_PCI_SOP1		0x50	/* SecureON passwd 1 */
+#define DC_PCI_CWUC		0x54	/* Configuration Wake-Up cmd */
+#define DC_PCI_CCID		0xDC	/* Capability ID - PD/TD only */
+#define DC_PCI_CPMC		0xE0	/* Pwrmgmt ctl & sts - PD/TD only */
+
+/* PCI ID register */
+#define DC_CFID_VENDOR		0x0000FFFF
+#define DC_CFID_DEVICE		0xFFFF0000
+
+/* PCI command/status register */
+#define DC_CFCS_IOSPACE		0x00000001 /* I/O space enable */
+#define DC_CFCS_MEMSPACE	0x00000002 /* memory space enable */
+#define DC_CFCS_BUSMASTER	0x00000004 /* bus master enable */
+#define DC_CFCS_MWI_ENB		0x00000008 /* mem write and inval enable */
+#define DC_CFCS_PARITYERR_ENB	0x00000020 /* parity error enable */
+#define DC_CFCS_SYSERR_ENB	0x00000080 /* system error enable */
+#define DC_CFCS_NEWCAPS		0x00100000 /* new capabilities */
+#define DC_CFCS_FAST_B2B	0x00800000 /* fast back-to-back capable */
+#define DC_CFCS_DATAPARITY	0x01000000 /* Parity error report */
+#define DC_CFCS_DEVSELTIM	0x06000000 /* devsel timing */
+#define DC_CFCS_TGTABRT		0x10000000 /* received target abort */
+#define DC_CFCS_MASTERABRT	0x20000000 /* received master abort */
+#define DC_CFCS_SYSERR		0x40000000 /* asserted system error */
+#define DC_CFCS_PARITYERR	0x80000000 /* asserted parity error */
+
+/* PCI revision register */
+#define DC_CFRV_STEPPING	0x0000000F
+#define DC_CFRV_REVISION	0x000000F0
+#define DC_CFRV_SUBCLASS	0x00FF0000
+#define DC_CFRV_BASECLASS	0xFF000000
+
+#define DC_21143_PB_REV		0x00000030
+#define DC_21143_TB_REV		0x00000030
+#define DC_21143_PC_REV		0x00000030
+#define DC_21143_TC_REV		0x00000030
+#define DC_21143_PD_REV		0x00000041
+#define DC_21143_TD_REV		0x00000041
+
+/* PCI latency timer register */
+#define DC_CFLT_CACHELINESIZE	0x000000FF
+#define DC_CFLT_LATENCYTIMER	0x0000FF00
+
+/* PCI subsystem ID register */
+#define DC_CSID_VENDOR		0x0000FFFF
+#define DC_CSID_DEVICE		0xFFFF0000
+
+/* PCI cababilities pointer */
+#define DC_CCAP_OFFSET		0x000000FF
+
+/* PCI interrupt config register */
+#define DC_CFIT_INTLINE		0x000000FF
+#define DC_CFIT_INTPIN		0x0000FF00
+#define DC_CFIT_MIN_GNT		0x00FF0000
+#define DC_CFIT_MAX_LAT		0xFF000000
+
+/* PCI capability register */
+#define DC_CCID_CAPID		0x000000FF
+#define DC_CCID_NEXTPTR		0x0000FF00
+#define DC_CCID_PM_VERS		0x00070000
+#define DC_CCID_PME_CLK		0x00080000
+#define DC_CCID_DVSPEC_INT	0x00200000
+#define DC_CCID_STATE_D1	0x02000000
+#define DC_CCID_STATE_D2	0x04000000
+#define DC_CCID_PME_D0		0x08000000
+#define DC_CCID_PME_D1		0x10000000
+#define DC_CCID_PME_D2		0x20000000
+#define DC_CCID_PME_D3HOT	0x40000000
+#define DC_CCID_PME_D3COLD	0x80000000
+
+/* PCI power management control/status register */
+#define DC_CPMC_STATE		0x00000003
+#define DC_CPMC_PME_ENB		0x00000100
+#define DC_CPMC_PME_STS		0x00008000
+
+#define DC_PSTATE_D0		0x0
+#define DC_PSTATE_D1		0x1
+#define DC_PSTATE_D2		0x2
+#define DC_PSTATE_D3		0x3
+
+/* Device specific region */
+/* Configuration and driver area */
+#define DC_CFDD_DRVUSE		0x0000FFFF
+#define DC_CFDD_SNOOZE_MODE	0x40000000
+#define DC_CFDD_SLEEP_MODE	0x80000000
+
+/* Configuration wake-up command register */
+#define DC_CWUC_MUST_BE_ZERO	0x00000001
+#define DC_CWUC_SECUREON_ENB	0x00000002
+#define DC_CWUC_FORCE_WUL	0x00000004
+#define DC_CWUC_BNC_ABILITY	0x00000008
+#define DC_CWUC_AUI_ABILITY	0x00000010
+#define DC_CWUC_TP10_ABILITY	0x00000020
+#define DC_CWUC_MII_ABILITY	0x00000040
+#define DC_CWUC_SYM_ABILITY	0x00000080
+#define DC_CWUC_LOCK		0x00000100
+
+#ifdef __alpha__
+#undef vtophys
+#define vtophys(va)		alpha_XXX_dmamap((vm_offset_t)va)
+#endif
+
+#ifndef ETHER_CRC_LEN
+#define ETHER_CRC_LEN	4
+#endif
+