This commit adds device driver support for the Sundance Technologies ST201

PCI fast ethernet controller. Currently, the only card I know that uses
this chip is the D-Link DFE-550TX. (Don't ask me where to buy these: the
only cards I have are samples sent to me by D-Link.)

This driver is the first to make use of the miibus code once I'm sure
it all works together nicely, I'll start converting the other drivers.

The Sundance chip is a clone of the 3Com 3c90x Etherlink XL design
only with its own register layout. Support is provided for ifmedia,
hardware multicast filtering, bridging and promiscuous mode.

1 files changed, 1644 insertions, 0 deletions

diff --git a/sys/pci/if_ste.c b/sys/pci/if_ste.c
new file mode 100644
index 0000000..112dbf4
--- /dev/null
+++ b/sys/pci/if_ste.c
@@ -0,0 +1,1644 @@
+/*
+ * Copyright (c) 1997, 1998, 1999
+ *	Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Bill Paul.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *	$Id: if_ste.c,v 1.6 1999/08/20 15:20:08 wpaul Exp $
+ */
+
+
+#include "bpf.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sockio.h>
+#include <sys/mbuf.h>
+#include <sys/malloc.h>
+#include <sys/kernel.h>
+#include <sys/socket.h>
+
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <net/ethernet.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+
+#if NBPF > 0
+#include <net/bpf.h>
+#endif
+
+#include "opt_bdg.h"
+#ifdef BRIDGE
+#include <net/bridge.h>
+#endif
+
+#include <vm/vm.h>              /* for vtophys */
+#include <vm/pmap.h>            /* for vtophys */
+#include <machine/clock.h>      /* for DELAY */
+#include <machine/bus_memio.h>
+#include <machine/bus_pio.h>
+#include <machine/bus.h>
+#include <machine/resource.h>
+#include <sys/bus.h>
+#include <sys/rman.h>
+
+#include <dev/mii/mii.h>
+#include <dev/mii/miivar.h>
+
+#include <pci/pcireg.h>
+#include <pci/pcivar.h>
+
+#include "miibus_if.h"
+
+#define STE_USEIOSPACE
+
+#include <pci/if_stereg.h>
+
+#if !defined(lint)
+static const char rcsid[] =
+	"$Id: if_ste.c,v 1.6 1999/08/20 15:20:08 wpaul Exp $";
+#endif
+
+/*
+ * Various supported device vendors/types and their names.
+ */
+static struct ste_type ste_devs[] = {
+	{ ST_VENDORID, ST_DEVICEID_ST201, "Sundance ST201 10/100BaseTX" },
+	{ DL_VENDORID, DL_DEVICEID_550TX, "D-Link DFE-550TX 10/100BaseTX" },
+	{ 0, 0, NULL }
+};
+
+static int ste_probe		__P((device_t));
+static int ste_attach		__P((device_t));
+static int ste_detach		__P((device_t));
+static void ste_init		__P((void *));
+static void ste_intr		__P((void *));
+static void ste_rxeof		__P((struct ste_softc *));
+static void ste_txeoc		__P((struct ste_softc *));
+static void ste_txeof		__P((struct ste_softc *));
+static void ste_stats_update	__P((void *));
+static void ste_stop		__P((struct ste_softc *));
+static void ste_reset		__P((struct ste_softc *));
+static int ste_ioctl		__P((struct ifnet *, u_long, caddr_t));
+static int ste_encap		__P((struct ste_softc *, struct ste_chain *,
+					struct mbuf *));
+static void ste_start		__P((struct ifnet *));
+static void ste_watchdog	__P((struct ifnet *));
+static void ste_shutdown	__P((device_t));
+static int ste_newbuf		__P((struct ste_softc *,
+					struct ste_chain_onefrag *,
+					struct mbuf *));
+static int ste_ifmedia_upd	__P((struct ifnet *));
+static void ste_ifmedia_sts	__P((struct ifnet *, struct ifmediareq *));
+
+static void ste_mii_sync	__P((struct ste_softc *));
+static void ste_mii_send	__P((struct ste_softc *, u_int32_t, int));
+static int ste_mii_readreg	__P((struct ste_softc *,
+					struct ste_mii_frame *));
+static int ste_mii_writereg	__P((struct ste_softc *,
+					struct ste_mii_frame *));
+static int ste_miibus_readreg	__P((device_t, int, int));
+static int ste_miibus_writereg	__P((device_t, int, int, int));
+static void ste_miibus_statchg	__P((device_t));
+
+static int ste_eeprom_wait	__P((struct ste_softc *));
+static int ste_read_eeprom	__P((struct ste_softc *, caddr_t, int,
+							int, int));
+static void ste_wait		__P((struct ste_softc *));
+static u_int8_t ste_calchash	__P((caddr_t));
+static void ste_setmulti	__P((struct ste_softc *));
+static int ste_init_rx_list	__P((struct ste_softc *));
+static void ste_init_tx_list	__P((struct ste_softc *));
+
+#ifdef STE_USEIOSPACE
+#define STE_RES			SYS_RES_IOPORT
+#define STE_RID			STE_PCI_LOIO
+#else
+#define STE_RES			SYS_RES_MEMORY
+#define STE_RID			STE_PCI_LOMEM
+#endif
+
+static device_method_t ste_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		ste_probe),
+	DEVMETHOD(device_attach,	ste_attach),
+	DEVMETHOD(device_detach,	ste_detach),
+	DEVMETHOD(device_shutdown,	ste_shutdown),
+
+	/* bus interface */
+	DEVMETHOD(bus_print_child,	bus_generic_print_child),
+	DEVMETHOD(bus_driver_added,	bus_generic_driver_added),
+
+	/* MII interface */
+	DEVMETHOD(miibus_readreg,	ste_miibus_readreg),
+	DEVMETHOD(miibus_writereg,	ste_miibus_writereg),
+	DEVMETHOD(miibus_statchg,	ste_miibus_statchg),
+
+	{ 0, 0 }
+};
+
+static driver_t ste_driver = {
+	"ste",
+	ste_methods,
+	sizeof(struct ste_softc)
+};
+
+static devclass_t ste_devclass;
+
+DRIVER_MODULE(ste, pci, ste_driver, ste_devclass, 0, 0);
+DRIVER_MODULE(miibus, ste, miibus_driver, miibus_devclass, 0, 0);
+
+#define STE_SETBIT4(sc, reg, x)				\
+	CSR_WRITE_4(sc, reg, CSR_READ_4(sc, reg) | x)
+
+#define STE_CLRBIT4(sc, reg, x)				\
+	CSR_WRITE_4(sc, reg, CSR_READ_4(sc, reg) & ~x)
+
+#define STE_SETBIT2(sc, reg, x)				\
+	CSR_WRITE_2(sc, reg, CSR_READ_2(sc, reg) | x)
+
+#define STE_CLRBIT2(sc, reg, x)				\
+	CSR_WRITE_2(sc, reg, CSR_READ_2(sc, reg) & ~x)
+
+#define STE_SETBIT1(sc, reg, x)				\
+	CSR_WRITE_1(sc, reg, CSR_READ_1(sc, reg) | x)
+
+#define STE_CLRBIT1(sc, reg, x)				\
+	CSR_WRITE_1(sc, reg, CSR_READ_1(sc, reg) & ~x)
+
+
+#define MII_SET(x)		STE_SETBIT1(sc, STE_PHYCTL, x)
+#define MII_CLR(x)		STE_CLRBIT1(sc, STE_PHYCTL, x) 
+
+/*
+ * Sync the PHYs by setting data bit and strobing the clock 32 times.
+ */
+static void ste_mii_sync(sc)
+	struct ste_softc		*sc;
+{
+	register int		i;
+
+	MII_SET(STE_PHYCTL_MDIR|STE_PHYCTL_MDATA);
+
+	for (i = 0; i < 32; i++) {
+		MII_SET(STE_PHYCTL_MCLK);
+		DELAY(1);
+		MII_CLR(STE_PHYCTL_MCLK);
+		DELAY(1);
+	}
+
+	return;
+}
+
+/*
+ * Clock a series of bits through the MII.
+ */
+static void ste_mii_send(sc, bits, cnt)
+	struct ste_softc		*sc;
+	u_int32_t		bits;
+	int			cnt;
+{
+	int			i;
+
+	MII_CLR(STE_PHYCTL_MCLK);
+
+	for (i = (0x1 << (cnt - 1)); i; i >>= 1) {
+                if (bits & i) {
+			MII_SET(STE_PHYCTL_MDATA);
+                } else {
+			MII_CLR(STE_PHYCTL_MDATA);
+                }
+		DELAY(1);
+		MII_CLR(STE_PHYCTL_MCLK);
+		DELAY(1);
+		MII_SET(STE_PHYCTL_MCLK);
+	}
+}
+
+/*
+ * Read an PHY register through the MII.
+ */
+static int ste_mii_readreg(sc, frame)
+	struct ste_softc		*sc;
+	struct ste_mii_frame	*frame;
+	
+{
+	int			i, ack, s;
+
+	s = splimp();
+
+	/*
+	 * Set up frame for RX.
+	 */
+	frame->mii_stdelim = STE_MII_STARTDELIM;
+	frame->mii_opcode = STE_MII_READOP;
+	frame->mii_turnaround = 0;
+	frame->mii_data = 0;
+	
+	CSR_WRITE_2(sc, STE_PHYCTL, 0);
+	/*
+ 	 * Turn on data xmit.
+	 */
+	MII_SET(STE_PHYCTL_MDIR);
+
+	ste_mii_sync(sc);
+
+	/*
+	 * Send command/address info.
+	 */
+	ste_mii_send(sc, frame->mii_stdelim, 2);
+	ste_mii_send(sc, frame->mii_opcode, 2);
+	ste_mii_send(sc, frame->mii_phyaddr, 5);
+	ste_mii_send(sc, frame->mii_regaddr, 5);
+
+	/* Turn off xmit. */
+	MII_CLR(STE_PHYCTL_MDIR);
+
+	/* Idle bit */
+	MII_CLR((STE_PHYCTL_MCLK|STE_PHYCTL_MDATA));
+	DELAY(1);
+	MII_SET(STE_PHYCTL_MCLK);
+	DELAY(1);
+
+	/* Check for ack */
+	MII_CLR(STE_PHYCTL_MCLK);
+	DELAY(1);
+	MII_SET(STE_PHYCTL_MCLK);
+	DELAY(1);
+	ack = CSR_READ_2(sc, STE_PHYCTL) & STE_PHYCTL_MDATA;
+
+	/*
+	 * Now try reading data bits. If the ack failed, we still
+	 * need to clock through 16 cycles to keep the PHY(s) in sync.
+	 */
+	if (ack) {
+		for(i = 0; i < 16; i++) {
+			MII_CLR(STE_PHYCTL_MCLK);
+			DELAY(1);
+			MII_SET(STE_PHYCTL_MCLK);
+			DELAY(1);
+		}
+		goto fail;
+	}
+
+	for (i = 0x8000; i; i >>= 1) {
+		MII_CLR(STE_PHYCTL_MCLK);
+		DELAY(1);
+		if (!ack) {
+			if (CSR_READ_2(sc, STE_PHYCTL) & STE_PHYCTL_MDATA)
+				frame->mii_data |= i;
+			DELAY(1);
+		}
+		MII_SET(STE_PHYCTL_MCLK);
+		DELAY(1);
+	}
+
+fail:
+
+	MII_CLR(STE_PHYCTL_MCLK);
+	DELAY(1);
+	MII_SET(STE_PHYCTL_MCLK);
+	DELAY(1);
+
+	splx(s);
+
+	if (ack)
+		return(1);
+	return(0);
+}
+
+/*
+ * Write to a PHY register through the MII.
+ */
+static int ste_mii_writereg(sc, frame)
+	struct ste_softc		*sc;
+	struct ste_mii_frame	*frame;
+	
+{
+	int			s;
+
+	s = splimp();
+	/*
+	 * Set up frame for TX.
+	 */
+
+	frame->mii_stdelim = STE_MII_STARTDELIM;
+	frame->mii_opcode = STE_MII_WRITEOP;
+	frame->mii_turnaround = STE_MII_TURNAROUND;
+	
+	/*
+ 	 * Turn on data output.
+	 */
+	MII_SET(STE_PHYCTL_MDIR);
+
+	ste_mii_sync(sc);
+
+	ste_mii_send(sc, frame->mii_stdelim, 2);
+	ste_mii_send(sc, frame->mii_opcode, 2);
+	ste_mii_send(sc, frame->mii_phyaddr, 5);
+	ste_mii_send(sc, frame->mii_regaddr, 5);
+	ste_mii_send(sc, frame->mii_turnaround, 2);
+	ste_mii_send(sc, frame->mii_data, 16);
+
+	/* Idle bit. */
+	MII_SET(STE_PHYCTL_MCLK);
+	DELAY(1);
+	MII_CLR(STE_PHYCTL_MCLK);
+	DELAY(1);
+
+	/*
+	 * Turn off xmit.
+	 */
+	MII_CLR(STE_PHYCTL_MDIR);
+
+	splx(s);
+
+	return(0);
+}
+
+static int ste_miibus_readreg(dev, phy, reg)
+	device_t		dev;
+	int			phy, reg;
+{
+	struct ste_softc	*sc;
+	struct ste_mii_frame	frame;
+
+	sc = device_get_softc(dev);
+
+	bzero((char *)&frame, sizeof(frame));
+
+	frame.mii_phyaddr = phy;
+	frame.mii_regaddr = reg;
+	ste_mii_readreg(sc, &frame);
+
+	return(frame.mii_data);
+}
+
+static int ste_miibus_writereg(dev, phy, reg, data)
+	device_t		dev;
+	int			phy, reg, data;
+{
+	struct ste_softc	*sc;
+	struct ste_mii_frame	frame;
+
+	sc = device_get_softc(dev);
+	bzero((char *)&frame, sizeof(frame));
+
+	frame.mii_phyaddr = phy;
+	frame.mii_regaddr = reg;
+	frame.mii_data = data;
+
+	ste_mii_writereg(sc, &frame);
+
+	return(0);
+}
+
+static void ste_miibus_statchg(dev)
+	device_t		dev;
+{
+	struct ste_softc	*sc;
+	struct mii_data		*mii;
+
+	sc = device_get_softc(dev);
+	mii = device_get_softc(sc->ste_miibus);
+
+	if ((mii->mii_media_active & IFM_GMASK) == IFM_FDX) {
+		STE_SETBIT2(sc, STE_MACCTL0, STE_MACCTL0_FULLDUPLEX);
+	} else {
+		STE_CLRBIT2(sc, STE_MACCTL0, STE_MACCTL0_FULLDUPLEX);
+	}
+
+	return;
+}
+ 
+static int ste_ifmedia_upd(ifp)
+	struct ifnet		*ifp;
+{
+	struct ste_softc	*sc;
+	struct mii_data		*mii;
+
+	sc = ifp->if_softc;
+	mii = device_get_softc(sc->ste_miibus);
+	mii_mediachg(mii);
+
+	return(0);
+}
+
+static void ste_ifmedia_sts(ifp, ifmr)
+	struct ifnet		*ifp;
+	struct ifmediareq	*ifmr;
+{
+	struct ste_softc	*sc;
+	struct mii_data		*mii;
+
+	sc = ifp->if_softc;
+	mii = device_get_softc(sc->ste_miibus);
+
+	mii_pollstat(mii);
+	ifmr->ifm_active = mii->mii_media_active;
+	ifmr->ifm_status = mii->mii_media_status;
+
+	return;
+}
+
+static void ste_wait(sc)
+	struct ste_softc		*sc;
+{
+	register int		i;
+
+	for (i = 0; i < STE_TIMEOUT; i++) {
+		if (!(CSR_READ_4(sc, STE_DMACTL) & STE_DMACTL_DMA_HALTINPROG))
+			break;
+	}
+
+	if (i == STE_TIMEOUT)
+		printf("ste%d: command never completed!\n", sc->ste_unit);
+
+	return;
+}
+
+/*
+ * The EEPROM is slow: give it time to come ready after issuing
+ * it a command.
+ */
+static int ste_eeprom_wait(sc)
+	struct ste_softc		*sc;
+{
+	int			i;
+
+	DELAY(1000);
+
+	for (i = 0; i < 100; i++) {
+		if (CSR_READ_2(sc, STE_EEPROM_CTL) & STE_EECTL_BUSY)
+			DELAY(1000);
+		else
+			break;
+	}
+
+	if (i == 100) {
+		printf("ste%d: eeprom failed to come ready\n", sc->ste_unit);
+		return(1);
+	}
+
+	return(0);
+}
+
+/*
+ * Read a sequence of words from the EEPROM. Note that ethernet address
+ * data is stored in the EEPROM in network byte order.
+ */
+static int ste_read_eeprom(sc, dest, off, cnt, swap)
+	struct ste_softc		*sc;
+	caddr_t			dest;
+	int			off;
+	int			cnt;
+	int			swap;
+{
+	int			err = 0, i;
+	u_int16_t		word = 0, *ptr;
+
+	if (ste_eeprom_wait(sc))
+		return(1);
+
+	for (i = 0; i < cnt; i++) {
+		CSR_WRITE_2(sc, STE_EEPROM_CTL, STE_EEOPCODE_READ | (off + i));
+		err = ste_eeprom_wait(sc);
+		if (err)
+			break;
+		word = CSR_READ_2(sc, STE_EEPROM_DATA);
+		ptr = (u_int16_t *)(dest + (i * 2));
+		if (swap)
+			*ptr = ntohs(word);
+		else
+			*ptr = word;	
+	}
+
+	return(err ? 1 : 0);
+}
+
+static u_int8_t ste_calchash(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 & 0x0000003F);
+}
+
+static void ste_setmulti(sc)
+	struct ste_softc	*sc;
+{
+	struct ifnet		*ifp;
+	int			h = 0;
+	u_int32_t		hashes[2] = { 0, 0 };
+	struct ifmultiaddr	*ifma;
+
+	ifp = &sc->arpcom.ac_if;
+	if (ifp->if_flags & IFF_ALLMULTI || ifp->if_flags & IFF_PROMISC) {
+		STE_SETBIT1(sc, STE_RX_MODE, STE_RXMODE_ALLMULTI);
+		STE_CLRBIT1(sc, STE_RX_MODE, STE_RXMODE_MULTIHASH);
+		return;
+	}
+
+	/* first, zot all the existing hash bits */
+	CSR_WRITE_4(sc, STE_MAR0, 0);
+	CSR_WRITE_4(sc, STE_MAR1, 0);
+
+	/* now program new ones */
+	for (ifma = ifp->if_multiaddrs.lh_first; ifma != NULL;
+	    ifma = ifma->ifma_link.le_next) {
+		if (ifma->ifma_addr->sa_family != AF_LINK)
+			continue;
+		h = ste_calchash(LLADDR((struct sockaddr_dl *)ifma->ifma_addr));
+		if (h < 32)
+			hashes[0] |= (1 << h);
+		else
+			hashes[1] |= (1 << (h - 32));
+	}
+
+	CSR_WRITE_4(sc, STE_MAR0, hashes[0]);
+	CSR_WRITE_4(sc, STE_MAR1, hashes[1]);
+	STE_CLRBIT1(sc, STE_RX_MODE, STE_RXMODE_ALLMULTI);
+	STE_SETBIT1(sc, STE_RX_MODE, STE_RXMODE_MULTIHASH);
+
+	return;
+}
+
+static void ste_intr(xsc)
+	void			*xsc;
+{
+	struct ste_softc	*sc;
+	struct ifnet		*ifp;
+	u_int16_t		status;
+
+	sc = xsc;
+	ifp = &sc->arpcom.ac_if;
+
+	/* See if this is really our interrupt. */
+	if (!(CSR_READ_2(sc, STE_ISR) & STE_ISR_INTLATCH))
+		return;
+
+	for (;;) {
+		status = CSR_READ_2(sc, STE_ISR_ACK);
+
+		if (!(status & STE_INTRS))
+			break;
+
+		if (status & STE_ISR_RX_DMADONE)
+			ste_rxeof(sc);
+
+		if (status & STE_ISR_TX_DMADONE)
+			ste_txeof(sc);
+
+		if (status & STE_ISR_TX_DONE)
+			ste_txeoc(sc);
+
+		if (status & STE_ISR_STATS_OFLOW) {
+			untimeout(ste_stats_update, sc, sc->ste_stat_ch);
+			ste_stats_update(sc);
+		}
+
+		if (status & STE_ISR_HOSTERR) {
+			ste_reset(sc);
+			ste_init(sc);
+		}
+	}
+
+	/* Re-enable interrupts */
+	CSR_WRITE_2(sc, STE_IMR, STE_INTRS);
+
+	if (ifp->if_snd.ifq_head != NULL)
+		ste_start(ifp);
+
+	return;
+}
+
+/*
+ * A frame has been uploaded: pass the resulting mbuf chain up to
+ * the higher level protocols.
+ */
+static void ste_rxeof(sc)
+	struct ste_softc		*sc;
+{
+        struct ether_header	*eh;
+        struct mbuf		*m;
+        struct ifnet		*ifp;
+	struct ste_chain_onefrag	*cur_rx;
+	int			total_len = 0;
+	u_int32_t		rxstat;
+
+	ifp = &sc->arpcom.ac_if;
+
+again:
+
+	while((rxstat = sc->ste_cdata.ste_rx_head->ste_ptr->ste_status)) {
+		cur_rx = sc->ste_cdata.ste_rx_head;
+		sc->ste_cdata.ste_rx_head = cur_rx->ste_next;
+
+		/*
+		 * 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 & STE_RXSTAT_FRAME_ERR) {
+			ifp->if_ierrors++;
+			cur_rx->ste_ptr->ste_status = 0;
+			continue;
+		}
+
+		/*
+		 * If there error bit was not set, the upload complete
+		 * bit should be set which means we have a valid packet.
+		 * If not, something truly strange has happened.
+		 */
+		if (!(rxstat & STE_RXSTAT_DMADONE)) {
+			printf("ste%d: bad receive status -- packet dropped",
+							sc->ste_unit);
+			ifp->if_ierrors++;
+			cur_rx->ste_ptr->ste_status = 0;
+			continue;
+		}
+
+		/* No errors; receive the packet. */	
+		m = cur_rx->ste_mbuf;
+		total_len = cur_rx->ste_ptr->ste_status & STE_RXSTAT_FRAMELEN;
+
+		/*
+		 * Try to conjure up a new mbuf cluster. If that
+		 * fails, it means we have an out of memory condition and
+		 * should leave the buffer in place and continue. This will
+		 * result in a lost packet, but there's little else we
+		 * can do in this situation.
+		 */
+		if (ste_newbuf(sc, cur_rx, NULL) == ENOBUFS) {
+			ifp->if_ierrors++;
+			cur_rx->ste_ptr->ste_status = 0;
+			continue;
+		}
+
+		ifp->if_ipackets++;
+		eh = mtod(m, struct ether_header *);
+		m->m_pkthdr.rcvif = ifp;
+		m->m_pkthdr.len = m->m_len = total_len;
+
+#if NBPF > 0
+		/* Handle BPF listeners. Let the BPF user see the packet. */
+		if (ifp->if_bpf)
+			bpf_mtap(ifp, m);
+#endif
+
+#ifdef BRIDGE
+		if (do_bridge) {
+			struct ifnet *bdg_ifp ;
+			bdg_ifp = bridge_in(m);
+			if (bdg_ifp != BDG_LOCAL && bdg_ifp != BDG_DROP)
+				bdg_forward(&m, bdg_ifp);
+			if (((bdg_ifp != BDG_LOCAL) && (bdg_ifp != BDG_BCAST) &&
+			    (bdg_ifp != BDG_MCAST)) || bdg_ifp == BDG_DROP) {
+				m_freem(m);
+				continue;
+			}
+		}
+#endif
+
+#if NBPF > 0
+		/*
+		 * Don't pass packet up to the ether_input() layer unless it's
+		 * a broadcast packet, multicast packet, matches our ethernet
+		 * address or the interface is in promiscuous mode.
+		 */
+		if (ifp->if_bpf) {
+			if (ifp->if_flags & IFF_PROMISC &&
+			    (bcmp(eh->ether_dhost, sc->arpcom.ac_enaddr,
+			    ETHER_ADDR_LEN) && (eh->ether_dhost[0] & 1) == 0)){
+				m_freem(m);
+				continue;
+			}
+		}
+#endif
+
+		/* Remove header from mbuf and pass it on. */
+		m_adj(m, sizeof(struct ether_header));
+		ether_input(ifp, eh, m);
+	}
+
+	/*
+	 * Handle the 'end of channel' condition. When the upload
+	 * engine hits the end of the RX ring, it will stall. This
+	 * is our cue to flush the RX ring, reload the uplist pointer
+	 * register and unstall the engine.
+	 * XXX This is actually a little goofy. With the ThunderLAN
+	 * chip, you get an interrupt when the receiver hits the end
+	 * of the receive ring, which tells you exactly when you
+	 * you need to reload the ring pointer. Here we have to
+	 * fake it. I'm mad at myself for not being clever enough
+	 * to avoid the use of a goto here.
+	 */
+	if (CSR_READ_4(sc, STE_RX_DMALIST_PTR) == 0 ||
+		CSR_READ_4(sc, STE_DMACTL) & STE_DMACTL_RXDMA_STOPPED) {
+		STE_SETBIT4(sc, STE_DMACTL, STE_DMACTL_RXDMA_STALL);
+		ste_wait(sc);
+		CSR_WRITE_4(sc, STE_RX_DMALIST_PTR,
+			vtophys(&sc->ste_ldata->ste_rx_list[0]));
+		sc->ste_cdata.ste_rx_head = &sc->ste_cdata.ste_rx_chain[0];
+		STE_SETBIT4(sc, STE_DMACTL, STE_DMACTL_RXDMA_UNSTALL);
+		goto again;
+	}
+
+	return;
+}
+
+static void ste_txeoc(sc)
+	struct ste_softc	*sc;
+{
+	u_int8_t		txstat;
+	struct ifnet		*ifp;
+
+	ifp = &sc->arpcom.ac_if;
+
+	while ((txstat = CSR_READ_1(sc, STE_TX_STATUS)) &
+	    STE_TXSTATUS_TXDONE) {
+		if (txstat & STE_TXSTATUS_UNDERRUN ||
+		    txstat & STE_TXSTATUS_EXCESSCOLLS ||
+		    txstat & STE_TXSTATUS_RECLAIMERR) {
+			ifp->if_oerrors++;
+			printf("ste%d: transmission error: %x\n",
+			    sc->ste_unit, txstat);
+			STE_SETBIT4(sc, STE_ASICCTL, STE_ASICCTL_TX_RESET);
+
+			if (sc->ste_cdata.ste_tx_head != NULL)
+				CSR_WRITE_4(sc, STE_TX_DMALIST_PTR,
+				    vtophys(sc->ste_cdata.ste_tx_head->ste_ptr));
+			if (txstat & STE_TXSTATUS_UNDERRUN &&
+			    sc->ste_tx_thresh < STE_PACKET_SIZE) {
+				sc->ste_tx_thresh += STE_MIN_FRAMELEN;
+				printf("ste%d: tx underrun, increasing tx"
+				    " start threshold to %d bytes\n",
+				    sc->ste_unit, sc->ste_tx_thresh);
+			}
+			CSR_WRITE_2(sc, STE_TX_STARTTHRESH, sc->ste_tx_thresh);
+			CSR_WRITE_2(sc, STE_TX_RECLAIM_THRESH,
+			    (STE_PACKET_SIZE >> 4));
+		}
+		STE_SETBIT2(sc, STE_MACCTL1, STE_MACCTL1_TX_ENABLE);
+		if (CSR_READ_4(sc, STE_TX_DMALIST_PTR))
+			CSR_WRITE_4(sc, STE_DMACTL, STE_DMACTL_TXDMA_UNSTALL);
+		CSR_WRITE_2(sc, STE_TX_STATUS, txstat);
+	}
+
+	return;
+}
+
+static void ste_txeof(sc)
+	struct ste_softc	*sc;
+{
+	struct ste_chain	*cur_tx;
+	struct ifnet		*ifp;
+
+	ifp = &sc->arpcom.ac_if;
+
+	/* Clear the timeout timer. */
+	ifp->if_timer = 0;
+
+	while(sc->ste_cdata.ste_tx_head != NULL) {
+		cur_tx = sc->ste_cdata.ste_tx_head;
+		if (!(cur_tx->ste_ptr->ste_ctl & STE_TXCTL_DMADONE))
+			break;
+		sc->ste_cdata.ste_tx_head = cur_tx->ste_next;
+
+		m_freem(cur_tx->ste_mbuf);
+		cur_tx->ste_mbuf = NULL;
+		ifp->if_opackets++;
+
+		cur_tx->ste_next = sc->ste_cdata.ste_tx_free;
+		sc->ste_cdata.ste_tx_free = cur_tx;
+	}
+
+	if (sc->ste_cdata.ste_tx_head == NULL) {
+		ifp->if_flags &= ~IFF_OACTIVE;
+		sc->ste_cdata.ste_tx_tail = NULL;
+	} else {
+		if (CSR_READ_4(sc, STE_DMACTL) & STE_DMACTL_TXDMA_STOPPED ||
+		    !CSR_READ_4(sc, STE_TX_DMALIST_PTR)) {
+			CSR_WRITE_4(sc, STE_TX_DMALIST_PTR,
+			    vtophys(sc->ste_cdata.ste_tx_head->ste_ptr));
+			CSR_WRITE_4(sc, STE_DMACTL, STE_DMACTL_TXDMA_UNSTALL);
+		}
+	}
+
+	return;
+}
+
+static void ste_stats_update(xsc)
+	void			*xsc;
+{
+	struct ste_softc	*sc;
+	struct ste_stats	stats;
+	struct ifnet		*ifp;
+	struct mii_data		*mii;
+	int			i, s;
+	u_int8_t		*p;
+
+	s = splimp();
+
+	sc = xsc;
+	ifp = &sc->arpcom.ac_if;
+	mii = device_get_softc(sc->ste_miibus);
+
+	p = (u_int8_t *)&stats;
+
+	for (i = 0; i < sizeof(stats); i++) {
+		*p = CSR_READ_1(sc, STE_STATS + i);
+		p++;
+	}
+
+	ifp->if_collisions += stats.ste_single_colls +
+	    stats.ste_multi_colls + stats.ste_late_colls;
+
+	mii_tick(mii);
+
+	sc->ste_stat_ch = timeout(ste_stats_update, sc, hz);
+	splx(s);
+
+	return;
+}
+
+
+/*
+ * Probe for a Sundance ST201 chip. Check the PCI vendor and device
+ * IDs against our list and return a device name if we find a match.
+ */
+static int ste_probe(dev)
+	device_t		dev;
+{
+	struct ste_type		*t;
+
+	t = ste_devs;
+
+	while(t->ste_name != NULL) {
+		if ((pci_get_vendor(dev) == t->ste_vid) &&
+		    (pci_get_device(dev) == t->ste_did)) {
+			device_set_desc(dev, t->ste_name);
+			return(0);
+		}
+		t++;
+	}
+
+	return(ENXIO);
+}
+
+/*
+ * Attach the interface. Allocate softc structures, do ifmedia
+ * setup and ethernet/BPF attach.
+ */
+static int ste_attach(dev)
+	device_t		dev;
+{
+	int			s;
+	u_int32_t		command;
+	struct ste_softc	*sc;
+	struct ifnet		*ifp;
+	int			unit, error = 0, rid;
+
+	s = splimp();
+
+	sc = device_get_softc(dev);
+	unit = device_get_unit(dev);
+	bzero(sc, sizeof(struct ste_softc));
+
+	/*
+	 * Handle power management nonsense.
+	 */
+	command = pci_read_config(dev, STE_PCI_CAPID, 4) & 0x000000FF;
+	if (command == 0x01) {
+
+		command = pci_read_config(dev, STE_PCI_PWRMGMTCTRL, 4);
+		if (command & STE_PSTATE_MASK) {
+			u_int32_t		iobase, membase, irq;
+
+			/* Save important PCI config data. */
+			iobase = pci_read_config(dev, STE_PCI_LOIO, 4);
+			membase = pci_read_config(dev, STE_PCI_LOMEM, 4);
+			irq = pci_read_config(dev, STE_PCI_INTLINE, 4);
+
+			/* Reset the power state. */
+			printf("ste%d: chip is in D%d power mode "
+			"-- setting to D0\n", unit, command & STE_PSTATE_MASK);
+			command &= 0xFFFFFFFC;
+			pci_write_config(dev, STE_PCI_PWRMGMTCTRL, command, 4);
+
+			/* Restore PCI config data. */
+			pci_write_config(dev, STE_PCI_LOIO, iobase, 4);
+			pci_write_config(dev, STE_PCI_LOMEM, membase, 4);
+			pci_write_config(dev, STE_PCI_INTLINE, irq, 4);
+		}
+	}
+
+	/*
+	 * Map control/status registers.
+	 */
+	command = pci_read_config(dev, PCI_COMMAND_STATUS_REG, 4);
+	command |= (PCIM_CMD_PORTEN|PCIM_CMD_MEMEN|PCIM_CMD_BUSMASTEREN);
+	pci_write_config(dev, PCI_COMMAND_STATUS_REG, command, 4);
+	command = pci_read_config(dev, PCI_COMMAND_STATUS_REG, 4);
+
+#ifdef STE_USEIOSPACE
+	if (!(command & PCIM_CMD_PORTEN)) {
+		printf("ste%d: failed to enable I/O ports!\n", unit);
+		error = ENXIO;
+		goto fail;
+	}
+#else
+	if (!(command & PCIM_CMD_MEMEN)) {
+		printf("ste%d: failed to enable memory mapping!\n", unit);
+		error = ENXIO;
+		goto fail;
+	}
+#endif
+
+	rid = STE_RID;
+	sc->ste_res = bus_alloc_resource(dev, STE_RES, &rid,
+	    0, ~0, 1, RF_ACTIVE);
+
+	if (sc->ste_res == NULL) {
+		printf ("ste%d: couldn't map ports/memory\n", unit);
+		error = ENXIO;
+		goto fail;
+	}
+
+	sc->ste_btag = rman_get_bustag(sc->ste_res);
+	sc->ste_bhandle = rman_get_bushandle(sc->ste_res);
+
+	rid = 0;
+	sc->ste_irq = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 0, ~0, 1,
+	    RF_SHAREABLE | RF_ACTIVE);
+
+	if (sc->ste_irq == NULL) {
+		printf("ste%d: couldn't map interrupt\n", unit);
+		bus_release_resource(dev, STE_RES, STE_RID, sc->ste_res);
+		error = ENXIO;
+		goto fail;
+	}
+
+	error = bus_setup_intr(dev, sc->ste_irq, INTR_TYPE_NET,
+	    ste_intr, sc, &sc->ste_intrhand);
+
+	if (error) {
+		bus_release_resource(dev, SYS_RES_IRQ, 0, sc->ste_irq);
+		bus_release_resource(dev, STE_RES, STE_RID, sc->ste_res);
+		printf("ste%d: couldn't set up irq\n", unit);
+		goto fail;
+	}
+
+	callout_handle_init(&sc->ste_stat_ch);
+
+	/* Reset the adapter. */
+	ste_reset(sc);
+
+	/*
+	 * Get station address from the EEPROM.
+	 */
+	if (ste_read_eeprom(sc, (caddr_t)&sc->arpcom.ac_enaddr,
+	    STE_EEADDR_NODE0, 3, 0)) {
+		printf("ste%d: failed to read station address\n", unit);
+		free(sc, M_DEVBUF);
+		goto fail;
+	}
+
+	/*
+	 * A Sundance chip was detected. Inform the world.
+	 */
+	printf("ste%d: Ethernet address: %6D\n", unit,
+	    sc->arpcom.ac_enaddr, ":");
+
+	sc->ste_unit = unit;
+
+	/* Allocate the descriptor queues. */
+	sc->ste_ldata = contigmalloc(sizeof(struct ste_list_data), M_DEVBUF,
+	    M_NOWAIT, 0x100000, 0xffffffff, PAGE_SIZE, 0);
+
+	if (sc->ste_ldata == NULL) {
+		free(sc, M_DEVBUF);
+		printf("ste%d: no memory for list buffers!\n", unit);
+		goto fail;
+	}
+
+	bzero(sc->ste_ldata, sizeof(struct ste_list_data));
+
+	/* Do MII setup. */
+	if (mii_phy_probe(dev, &sc->ste_miibus,
+		ste_ifmedia_upd, ste_ifmedia_sts)) {
+		printf("ste%d: MII without any phy!\n", sc->ste_unit);
+		bus_teardown_intr(dev, sc->ste_irq, sc->ste_intrhand);
+		bus_release_resource(dev, SYS_RES_IRQ, 0, sc->ste_irq);
+		bus_release_resource(dev, STE_RES, STE_RID, sc->ste_res);
+		free(sc->ste_ldata, M_DEVBUF);
+		error = ENXIO;
+		goto fail;
+	}
+
+	ifp = &sc->arpcom.ac_if;
+	ifp->if_softc = sc;
+	ifp->if_unit = unit;
+	ifp->if_name = "ste";
+	ifp->if_mtu = ETHERMTU;
+	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
+	ifp->if_ioctl = ste_ioctl;
+	ifp->if_output = ether_output;
+	ifp->if_start = ste_start;
+	ifp->if_watchdog = ste_watchdog;
+	ifp->if_init = ste_init;
+	ifp->if_baudrate = 10000000;
+	ifp->if_snd.ifq_maxlen = STE_TX_LIST_CNT - 1;
+
+	/*
+	 * Call MI attach routines.
+	 */
+
+	if_attach(ifp);
+	ether_ifattach(ifp);
+
+#if NBPF > 0
+	bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
+#endif
+
+fail:
+	splx(s);
+	return(error);
+}
+
+static int ste_detach(dev)
+	device_t		dev;
+{
+	struct ste_softc	*sc;
+	struct ifnet		*ifp;
+	int			s;
+
+	s = splimp();
+
+	sc = device_get_softc(dev);
+	ifp = &sc->arpcom.ac_if;
+
+	ste_stop(sc);
+	if_detach(ifp);
+
+	bus_generic_detach(dev);
+	device_delete_child(dev, sc->ste_miibus);
+
+	bus_teardown_intr(dev, sc->ste_irq, sc->ste_intrhand);
+	bus_release_resource(dev, SYS_RES_IRQ, 0, sc->ste_irq);
+	bus_release_resource(dev, STE_RES, STE_RID, sc->ste_res);
+
+	free(sc->ste_ldata, M_DEVBUF);
+
+	splx(s);
+
+	return(0);
+}
+
+static int ste_newbuf(sc, c, m)
+	struct ste_softc	*sc;
+	struct ste_chain_onefrag	*c;
+	struct mbuf		*m;
+{
+	struct mbuf		*m_new = NULL;
+
+	if (m == NULL) {
+		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		if (m_new == NULL) {
+			printf("ste%d: no memory for rx list -- "
+			    "packet dropped\n", sc->ste_unit);
+			return(ENOBUFS);
+		}
+		MCLGET(m_new, M_DONTWAIT);
+		if (!(m_new->m_flags & M_EXT)) {
+			printf("ste%d: no memory for rx list -- "
+			    "packet dropped\n", sc->ste_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, ETHER_ALIGN);
+
+	c->ste_mbuf = m_new;
+	c->ste_ptr->ste_status = 0;
+	c->ste_ptr->ste_frag.ste_addr = vtophys(mtod(m_new, caddr_t));
+	c->ste_ptr->ste_frag.ste_len = 1536 | STE_FRAG_LAST;
+
+	return(0);
+}
+
+static int ste_init_rx_list(sc)
+	struct ste_softc	*sc;
+{
+	struct ste_chain_data	*cd;
+	struct ste_list_data	*ld;
+	int			i;
+
+	cd = &sc->ste_cdata;
+	ld = sc->ste_ldata;
+
+	for (i = 0; i < STE_RX_LIST_CNT; i++) {
+		cd->ste_rx_chain[i].ste_ptr = &ld->ste_rx_list[i];
+		if (ste_newbuf(sc, &cd->ste_rx_chain[i], NULL) == ENOBUFS)
+			return(ENOBUFS);
+		if (i == (STE_RX_LIST_CNT - 1)) {
+			cd->ste_rx_chain[i].ste_next =
+			    &cd->ste_rx_chain[0];
+			ld->ste_rx_list[i].ste_next =
+			    vtophys(&ld->ste_rx_list[0]);
+		} else {
+			cd->ste_rx_chain[i].ste_next =
+			    &cd->ste_rx_chain[i + 1];
+			ld->ste_rx_list[i].ste_next =
+			    vtophys(&ld->ste_rx_list[i + 1]);
+		}
+
+	}
+
+	cd->ste_rx_head = &cd->ste_rx_chain[0];
+
+	return(0);
+}
+
+static void ste_init_tx_list(sc)
+	struct ste_softc	*sc;
+{
+	struct ste_chain_data	*cd;
+	struct ste_list_data	*ld;
+	int			i;
+
+	cd = &sc->ste_cdata;
+	ld = sc->ste_ldata;
+	for (i = 0; i < STE_TX_LIST_CNT; i++) {
+		cd->ste_tx_chain[i].ste_ptr = &ld->ste_tx_list[i];
+		if (i == (STE_TX_LIST_CNT - 1))
+			cd->ste_tx_chain[i].ste_next = NULL;
+		else
+			cd->ste_tx_chain[i].ste_next =
+			    &cd->ste_tx_chain[i + 1];
+	}
+
+	cd->ste_tx_free = &cd->ste_tx_chain[0];
+	cd->ste_tx_tail = cd->ste_tx_head = NULL;
+
+	return;
+}
+
+static void ste_init(xsc)
+	void			*xsc;
+{
+	struct ste_softc	*sc;
+	int			i, s;
+	struct ifnet		*ifp;
+	struct mii_data		*mii;
+
+	s = splimp();
+
+	sc = xsc;
+	ifp = &sc->arpcom.ac_if;
+	mii = device_get_softc(sc->ste_miibus);
+
+	ste_stop(sc);
+
+	/* Init our MAC address */
+	for (i = 0; i < ETHER_ADDR_LEN; i++) {
+		CSR_WRITE_1(sc, STE_PAR0 + i, sc->arpcom.ac_enaddr[i]);
+	}
+
+	/* Init RX list */
+	if (ste_init_rx_list(sc) == ENOBUFS) {
+		printf("ste%d: initialization failed: no "
+		    "memory for RX buffers\n", sc->ste_unit);
+		ste_stop(sc);
+		splx(s);
+		return;
+	}
+
+	/* Init TX descriptors */
+	ste_init_tx_list(sc);
+
+	/* Set the TX freethresh value */
+	CSR_WRITE_1(sc, STE_TX_DMABURST_THRESH, STE_PACKET_SIZE >> 8);
+
+	/* Set the TX start threshold for best performance. */
+	sc->ste_tx_thresh = STE_MIN_FRAMELEN;
+	CSR_WRITE_2(sc, STE_TX_STARTTHRESH, sc->ste_tx_thresh);
+
+	/* Set the TX reclaim threshold. */
+	CSR_WRITE_1(sc, STE_TX_RECLAIM_THRESH, (STE_PACKET_SIZE >> 4));
+
+	/* Set up the RX filter. */
+	CSR_WRITE_1(sc, STE_RX_MODE, STE_RXMODE_UNICAST);
+
+	/* If we want promiscuous mode, set the allframes bit. */
+	if (ifp->if_flags & IFF_PROMISC) {
+		STE_SETBIT1(sc, STE_RX_MODE, STE_RXMODE_PROMISC);
+	} else {
+		STE_CLRBIT1(sc, STE_RX_MODE, STE_RXMODE_PROMISC);
+	}
+
+	/* Set capture broadcast bit to accept broadcast frames. */
+	if (ifp->if_flags & IFF_BROADCAST) {
+		STE_SETBIT1(sc, STE_RX_MODE, STE_RXMODE_BROADCAST);
+	} else {
+		STE_CLRBIT1(sc, STE_RX_MODE, STE_RXMODE_BROADCAST);
+	}
+
+	ste_setmulti(sc);
+
+	/* Load the address of the RX list. */
+	STE_SETBIT4(sc, STE_DMACTL, STE_DMACTL_RXDMA_STALL);
+	ste_wait(sc);
+	CSR_WRITE_4(sc, STE_RX_DMALIST_PTR,
+	    vtophys(&sc->ste_ldata->ste_rx_list[0]));
+	STE_SETBIT4(sc, STE_DMACTL, STE_DMACTL_RXDMA_UNSTALL);
+	STE_SETBIT4(sc, STE_DMACTL, STE_DMACTL_RXDMA_UNSTALL);
+
+	/* Enable receiver and transmitter */
+	CSR_WRITE_2(sc, STE_MACCTL0, 0);
+	STE_SETBIT2(sc, STE_MACCTL1, STE_MACCTL1_TX_ENABLE);
+	STE_SETBIT2(sc, STE_MACCTL1, STE_MACCTL1_RX_ENABLE);
+
+	/* Enable stats counters. */
+	STE_SETBIT2(sc, STE_MACCTL1, STE_MACCTL1_STATS_ENABLE);
+
+	/* Enable interrupts. */
+	CSR_WRITE_2(sc, STE_ISR, 0xFFFF);
+	CSR_WRITE_2(sc, STE_IMR, STE_INTRS);
+
+	mii_mediachg(mii);
+
+	ifp->if_flags |= IFF_RUNNING;
+	ifp->if_flags &= ~IFF_OACTIVE;
+
+	splx(s);
+
+	sc->ste_stat_ch = timeout(ste_stats_update, sc, hz);
+
+	return;
+}
+
+static void ste_stop(sc)
+	struct ste_softc	*sc;
+{
+	int			i;
+	struct ifnet		*ifp;
+
+	ifp = &sc->arpcom.ac_if;
+
+	untimeout(ste_stats_update, sc, sc->ste_stat_ch);
+
+	CSR_WRITE_2(sc, STE_IMR, 0);
+	STE_SETBIT2(sc, STE_MACCTL1, STE_MACCTL1_TX_DISABLE);
+	STE_SETBIT2(sc, STE_MACCTL1, STE_MACCTL1_RX_DISABLE);
+	STE_SETBIT2(sc, STE_MACCTL1, STE_MACCTL1_STATS_DISABLE);
+	STE_SETBIT2(sc, STE_DMACTL, STE_DMACTL_TXDMA_STALL);
+	STE_SETBIT2(sc, STE_DMACTL, STE_DMACTL_RXDMA_STALL);
+	ste_wait(sc);
+
+	for (i = 0; i < STE_RX_LIST_CNT; i++) {
+		if (sc->ste_cdata.ste_rx_chain[i].ste_mbuf != NULL) {
+			m_freem(sc->ste_cdata.ste_rx_chain[i].ste_mbuf);
+			sc->ste_cdata.ste_rx_chain[i].ste_mbuf = NULL;
+		}
+	}
+
+	for (i = 0; i < STE_TX_LIST_CNT; i++) {
+		if (sc->ste_cdata.ste_tx_chain[i].ste_mbuf != NULL) {
+			m_freem(sc->ste_cdata.ste_tx_chain[i].ste_mbuf);
+			sc->ste_cdata.ste_tx_chain[i].ste_mbuf = NULL;
+		}
+	}
+
+	ifp->if_flags &= ~(IFF_RUNNING|IFF_OACTIVE);
+
+	return;
+}
+
+static void ste_reset(sc)
+	struct ste_softc	*sc;
+{
+	int			i;
+
+	STE_SETBIT4(sc, STE_ASICCTL,
+	    STE_ASICCTL_GLOBAL_RESET|STE_ASICCTL_RX_RESET|
+	    STE_ASICCTL_TX_RESET|STE_ASICCTL_DMA_RESET|
+	    STE_ASICCTL_FIFO_RESET|STE_ASICCTL_NETWORK_RESET|
+	    STE_ASICCTL_AUTOINIT_RESET|STE_ASICCTL_HOST_RESET|
+	    STE_ASICCTL_EXTRESET_RESET);
+
+	DELAY(100000);
+
+	for (i = 0; i < STE_TIMEOUT; i++) {
+		if (!(CSR_READ_4(sc, STE_ASICCTL) & STE_ASICCTL_RESET_BUSY))
+			break;
+	}
+
+	if (i == STE_TIMEOUT)
+		printf("ste%d: global reset never completed\n", sc->ste_unit);
+
+#ifdef foo
+	STE_SETBIT4(sc, STE_ASICCTL, STE_ASICCTL_RX_RESET);
+	for (i = 0; i < STE_TIMEOUT; i++) {
+		if (!(CSR_READ_4(sc, STE_ASICCTL) & STE_ASICCTL_RX_RESET))
+			break;
+	}
+
+	if (i == STE_TIMEOUT)
+		printf("ste%d: RX reset never completed\n", sc->ste_unit);
+
+	DELAY(100000);
+
+	STE_SETBIT4(sc, STE_ASICCTL, STE_ASICCTL_TX_RESET);
+	for (i = 0; i < STE_TIMEOUT; i++) {
+		if (!(CSR_READ_4(sc, STE_ASICCTL) & STE_ASICCTL_TX_RESET))
+			break;
+	}
+
+	if (i == STE_TIMEOUT)
+		printf("ste%d: TX reset never completed\n", sc->ste_unit);
+
+	DELAY(100000);
+#endif
+
+	return;
+}
+
+static int ste_ioctl(ifp, command, data)
+	struct ifnet		*ifp;
+	u_long			command;
+	caddr_t			data;
+{
+	struct ste_softc	*sc;
+	struct ifreq		*ifr;
+	struct mii_data		*mii;
+	int			error = 0, s;
+
+	s = splimp();
+
+	sc = ifp->if_softc;
+	ifr = (struct ifreq *)data;
+
+	switch(command) {
+	case SIOCSIFADDR:
+	case SIOCGIFADDR:
+	case SIOCSIFMTU:
+		error = ether_ioctl(ifp, command, data);
+		break;
+	case SIOCSIFFLAGS:
+		if (ifp->if_flags & IFF_UP) {
+			ste_init(sc);
+		} else {
+			if (ifp->if_flags & IFF_RUNNING)
+				ste_stop(sc);
+		}
+		error = 0;
+		break;
+	case SIOCADDMULTI:
+	case SIOCDELMULTI:
+		ste_setmulti(sc);
+		error = 0;
+		break;
+	case SIOCGIFMEDIA:
+	case SIOCSIFMEDIA:
+		mii = device_get_softc(sc->ste_miibus);
+		error = ifmedia_ioctl(ifp, ifr, &mii->mii_media, command);
+		break;
+	default:
+		error = EINVAL;
+		break;
+	}
+
+	splx(s);
+
+	return(error);
+}
+
+static int ste_encap(sc, c, m_head)
+	struct ste_softc	*sc;
+	struct ste_chain	*c;
+	struct mbuf		*m_head;
+{
+	int			frag = 0;
+	struct ste_frag		*f = NULL;
+	int			total_len;
+	struct mbuf		*m;
+
+	m = m_head;
+	total_len = 0;
+
+	for (m = m_head, frag = 0; m != NULL; m = m->m_next) {
+		if (m->m_len != 0) {
+			if (frag == STE_MAXFRAGS)
+				break;
+			total_len += m->m_len;
+			f = &c->ste_ptr->ste_frags[frag];
+			f->ste_addr = vtophys(mtod(m, vm_offset_t));
+			f->ste_len = m->m_len;
+			frag++;
+		}
+	}
+
+	if (m != NULL) {
+		struct mbuf		*m_new = NULL;
+
+		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
+		if (m_new == NULL) {
+			printf("ste%d: no memory for "
+			   "tx list", sc->ste_unit);
+			return(1);
+		}
+		if (m_head->m_pkthdr.len > MHLEN) {
+			MCLGET(m_new, M_DONTWAIT);
+			if (!(m_new->m_flags & M_EXT)) {
+				m_freem(m_new);
+				printf("ste%d: no memory for "
+			   	    "tx list", sc->ste_unit);
+				return(1);
+			}
+		}
+		m_copydata(m_head, 0, m_head->m_pkthdr.len,
+		    mtod(m_new, caddr_t));
+		m_new->m_pkthdr.len = m_new->m_len = m_head->m_pkthdr.len;
+		m_freem(m_head);
+		m_head = m_new;
+		f = &c->ste_ptr->ste_frags[0];
+		f->ste_addr = vtophys(mtod(m_new, caddr_t));
+		f->ste_len = total_len = m_new->m_len;
+		frag = 1;
+	}
+
+	c->ste_mbuf = m_head;
+	c->ste_ptr->ste_frags[frag - 1].ste_len |= STE_FRAG_LAST;
+	c->ste_ptr->ste_ctl = total_len;
+	c->ste_ptr->ste_next = 0;
+
+	return(0);
+}
+
+static void ste_start(ifp)
+	struct ifnet		*ifp;
+{
+	struct ste_softc	*sc;
+	struct mbuf		*m_head = NULL;
+	struct ste_chain	*prev = NULL, *cur_tx = NULL, *start_tx;
+
+	sc = ifp->if_softc;
+
+	if (sc->ste_cdata.ste_tx_free == NULL) {
+		ifp->if_flags |= IFF_OACTIVE;
+		return;
+	}
+
+	start_tx = sc->ste_cdata.ste_tx_free;
+
+	while(sc->ste_cdata.ste_tx_free != NULL) {
+		IF_DEQUEUE(&ifp->if_snd, m_head);
+		if (m_head == NULL)
+			break;
+
+		cur_tx = sc->ste_cdata.ste_tx_free;
+		sc->ste_cdata.ste_tx_free = cur_tx->ste_next;
+
+		cur_tx->ste_next = NULL;
+
+		ste_encap(sc, cur_tx, m_head);
+
+		if (prev != NULL) {
+			prev->ste_next = cur_tx;
+			prev->ste_ptr->ste_next = vtophys(cur_tx->ste_ptr);
+		}
+		prev = cur_tx;
+
+#if NBPF > 0
+		/*
+		 * If there's a BPF listener, bounce a copt of this frame
+		 * to him.
+	 	 */
+		if (ifp->if_bpf)
+			bpf_mtap(ifp, cur_tx->ste_mbuf);
+#endif
+	}
+
+	if (cur_tx == NULL)
+		return;
+
+	cur_tx->ste_ptr->ste_ctl |= STE_TXCTL_DMAINTR;
+
+	STE_SETBIT4(sc, STE_DMACTL, STE_DMACTL_TXDMA_STALL);
+	ste_wait(sc);
+
+	if (sc->ste_cdata.ste_tx_head != NULL) {
+		sc->ste_cdata.ste_tx_tail->ste_next = start_tx;
+		sc->ste_cdata.ste_tx_tail->ste_ptr->ste_next =
+		    vtophys(start_tx->ste_ptr);
+		sc->ste_cdata.ste_tx_tail->ste_ptr->ste_ctl &=
+		    ~STE_TXCTL_DMAINTR;
+		sc->ste_cdata.ste_tx_tail = cur_tx;
+	} else {
+		sc->ste_cdata.ste_tx_head = start_tx;
+		sc->ste_cdata.ste_tx_tail = cur_tx;
+	}
+
+	if (!CSR_READ_4(sc, STE_TX_DMALIST_PTR))
+		CSR_WRITE_4(sc, STE_TX_DMALIST_PTR,
+		    vtophys(start_tx->ste_ptr));
+	STE_SETBIT4(sc, STE_DMACTL, STE_DMACTL_TXDMA_UNSTALL);
+
+	ifp->if_timer = 5;
+
+	return;
+}
+
+static void ste_watchdog(ifp)
+	struct ifnet		*ifp;
+{
+	struct ste_softc	*sc;
+
+	sc = ifp->if_softc;
+
+	ifp->if_oerrors++;
+	printf("ste%d: watchdog timeout\n", sc->ste_unit);
+
+#ifdef foo
+	if (sc->ste_pinfo != NULL) {
+		if (!(ste_phy_readreg(sc, PHY_BMSR) & PHY_BMSR_LINKSTAT))
+			printf("ste%d: no carrier - transceiver "
+			    "cable problem?\n", sc->ste_unit);
+	}
+#endif
+
+	ste_txeoc(sc);
+	ste_txeof(sc);
+	ste_rxeof(sc);
+	ste_reset(sc);
+	ste_init(sc);
+
+	if (ifp->if_snd.ifq_head != NULL)
+		ste_start(ifp);
+
+	return;
+}
+
+static void ste_shutdown(dev)
+	device_t		dev;
+{
+	struct ste_softc	*sc;
+
+	sc = device_get_softc(dev);
+
+	ste_stop(sc);
+
+	return;
+}