Move the ste driver from sys/pci to sys/dev/ste.

1 files changed, 1752 insertions, 0 deletions

diff --git a/sys/dev/ste/if_ste.c b/sys/dev/ste/if_ste.c
new file mode 100644
index 0000000..0e06d7b
--- /dev/null
+++ b/sys/dev/ste/if_ste.c
@@ -0,0 +1,1752 @@
+/*-
+ * 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#ifdef HAVE_KERNEL_OPTION_HEADERS
+#include "opt_device_polling.h"
+#endif
+
+#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/module.h>
+#include <sys/socket.h>
+#include <sys/sysctl.h>
+
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <net/ethernet.h>
+#include <net/if_dl.h>
+#include <net/if_media.h>
+#include <net/if_types.h>
+#include <net/if_vlan_var.h>
+
+#include <net/bpf.h>
+
+#include <vm/vm.h>              /* for vtophys */
+#include <vm/pmap.h>            /* for vtophys */
+#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 <dev/pci/pcireg.h>
+#include <dev/pci/pcivar.h>
+
+/* "device miibus" required.  See GENERIC if you get errors here. */
+#include "miibus_if.h"
+
+#define STE_USEIOSPACE
+
+#include <dev/ste/if_stereg.h>
+
+MODULE_DEPEND(ste, pci, 1, 1, 1);
+MODULE_DEPEND(ste, ether, 1, 1, 1);
+MODULE_DEPEND(ste, miibus, 1, 1, 1);
+
+/*
+ * Various supported device vendors/types and their names.
+ */
+static struct ste_type ste_devs[] = {
+	{ ST_VENDORID, ST_DEVICEID_ST201_1, "Sundance ST201 10/100BaseTX" },
+	{ ST_VENDORID, ST_DEVICEID_ST201_2, "Sundance ST201 10/100BaseTX" },
+	{ DL_VENDORID, DL_DEVICEID_DL10050, "D-Link DL10050 10/100BaseTX" },
+	{ 0, 0, NULL }
+};
+
+static int ste_probe(device_t);
+static int ste_attach(device_t);
+static int ste_detach(device_t);
+static void ste_init(void *);
+static void ste_init_locked(struct ste_softc *);
+static void ste_intr(void *);
+static void ste_rxeoc(struct ste_softc *);
+static void ste_rxeof(struct ste_softc *);
+static void ste_txeoc(struct ste_softc *);
+static void ste_txeof(struct ste_softc *);
+static void ste_stats_update(void *);
+static void ste_stop(struct ste_softc *);
+static void ste_reset(struct ste_softc *);
+static int ste_ioctl(struct ifnet *, u_long, caddr_t);
+static int ste_encap(struct ste_softc *, struct ste_chain *, struct mbuf *);
+static void ste_start(struct ifnet *);
+static void ste_start_locked(struct ifnet *);
+static void ste_watchdog(struct ifnet *);
+static int ste_shutdown(device_t);
+static int ste_newbuf(struct ste_softc *, struct ste_chain_onefrag *,
+		struct mbuf *);
+static int ste_ifmedia_upd(struct ifnet *);
+static void ste_ifmedia_upd_locked(struct ifnet *);
+static void ste_ifmedia_sts(struct ifnet *, struct ifmediareq *);
+
+static void ste_mii_sync(struct ste_softc *);
+static void ste_mii_send(struct ste_softc *, u_int32_t, int);
+static int ste_mii_readreg(struct ste_softc *, struct ste_mii_frame *);
+static int ste_mii_writereg(struct ste_softc *, struct ste_mii_frame *);
+static int ste_miibus_readreg(device_t, int, int);
+static int ste_miibus_writereg(device_t, int, int, int);
+static void ste_miibus_statchg(device_t);
+
+static int ste_eeprom_wait(struct ste_softc *);
+static int ste_read_eeprom(struct ste_softc *, caddr_t, int, int, int);
+static void ste_wait(struct ste_softc *);
+static void ste_setmulti(struct ste_softc *);
+static int ste_init_rx_list(struct ste_softc *);
+static void ste_init_tx_list(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);
+
+SYSCTL_NODE(_hw, OID_AUTO, ste, CTLFLAG_RD, 0, "if_ste parameters");
+
+static int ste_rxsyncs;
+SYSCTL_INT(_hw_ste, OID_AUTO, rxsyncs, CTLFLAG_RW, &ste_rxsyncs, 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;
+
+	/*
+	 * 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);
+	ack = CSR_READ_2(sc, STE_PHYCTL) & STE_PHYCTL_MDATA;
+	MII_SET(STE_PHYCTL_MCLK);
+	DELAY(1);
+
+	/*
+	 * 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);
+
+	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;
+	
+{
+
+	/*
+	 * 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);
+
+	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);
+
+	if ( sc->ste_one_phy && phy != 0 )
+		return (0);
+
+	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;
+
+	sc = ifp->if_softc;
+	STE_LOCK(sc);
+	ste_ifmedia_upd_locked(ifp);
+	STE_UNLOCK(sc);
+
+	return(0);	
+}
+
+static void
+ste_ifmedia_upd_locked(ifp)
+	struct ifnet		*ifp;
+{
+	struct ste_softc	*sc;
+	struct mii_data		*mii;
+
+	sc = ifp->if_softc;
+	STE_LOCK_ASSERT(sc);
+	mii = device_get_softc(sc->ste_miibus);
+	sc->ste_link = 0;
+	if (mii->mii_instance) {
+		struct mii_softc	*miisc;
+		LIST_FOREACH(miisc, &mii->mii_phys, mii_list)
+			mii_phy_reset(miisc);
+	}
+	mii_mediachg(mii);
+}
+
+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);
+
+	STE_LOCK(sc);
+	mii_pollstat(mii);
+	ifmr->ifm_active = mii->mii_media_active;
+	ifmr->ifm_status = mii->mii_media_status;
+	STE_UNLOCK(sc);
+
+	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)
+		device_printf(sc->ste_dev, "command never completed!\n");
+
+	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) {
+		device_printf(sc->ste_dev, "eeprom failed to come ready\n");
+		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 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->ste_ifp;
+	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_2(sc, STE_MAR0, 0);
+	CSR_WRITE_2(sc, STE_MAR1, 0);
+	CSR_WRITE_2(sc, STE_MAR2, 0);
+	CSR_WRITE_2(sc, STE_MAR3, 0);
+
+	/* now program new ones */
+	IF_ADDR_LOCK(ifp);
+	TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
+		if (ifma->ifma_addr->sa_family != AF_LINK)
+			continue;
+		h = ether_crc32_be(LLADDR((struct sockaddr_dl *)
+		    ifma->ifma_addr), ETHER_ADDR_LEN) & 0x3F;
+		if (h < 32)
+			hashes[0] |= (1 << h);
+		else
+			hashes[1] |= (1 << (h - 32));
+	}
+	IF_ADDR_UNLOCK(ifp);
+
+	CSR_WRITE_2(sc, STE_MAR0, hashes[0] & 0xFFFF);
+	CSR_WRITE_2(sc, STE_MAR1, (hashes[0] >> 16) & 0xFFFF);
+	CSR_WRITE_2(sc, STE_MAR2, hashes[1] & 0xFFFF);
+	CSR_WRITE_2(sc, STE_MAR3, (hashes[1] >> 16) & 0xFFFF);
+	STE_CLRBIT1(sc, STE_RX_MODE, STE_RXMODE_ALLMULTI);
+	STE_SETBIT1(sc, STE_RX_MODE, STE_RXMODE_MULTIHASH);
+
+	return;
+}
+
+#ifdef DEVICE_POLLING
+static poll_handler_t ste_poll, ste_poll_locked;
+
+static void
+ste_poll(struct ifnet *ifp, enum poll_cmd cmd, int count)
+{
+	struct ste_softc *sc = ifp->if_softc;
+
+	STE_LOCK(sc);
+	if (ifp->if_drv_flags & IFF_DRV_RUNNING)
+		ste_poll_locked(ifp, cmd, count);
+	STE_UNLOCK(sc);
+}
+
+static void
+ste_poll_locked(struct ifnet *ifp, enum poll_cmd cmd, int count)
+{
+	struct ste_softc *sc = ifp->if_softc;
+
+	STE_LOCK_ASSERT(sc);
+
+	sc->rxcycles = count;
+	if (cmd == POLL_AND_CHECK_STATUS)
+		ste_rxeoc(sc);
+	ste_rxeof(sc);
+	ste_txeof(sc);
+	if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
+		ste_start_locked(ifp);
+
+	if (cmd == POLL_AND_CHECK_STATUS) {
+		u_int16_t status;
+
+		status = CSR_READ_2(sc, STE_ISR_ACK);
+
+		if (status & STE_ISR_TX_DONE)
+			ste_txeoc(sc);
+
+		if (status & STE_ISR_STATS_OFLOW) {
+			callout_stop(&sc->ste_stat_callout);
+			ste_stats_update(sc);
+		}
+
+		if (status & STE_ISR_LINKEVENT)
+			mii_pollstat(device_get_softc(sc->ste_miibus));
+
+		if (status & STE_ISR_HOSTERR) {
+			ste_reset(sc);
+			ste_init_locked(sc);
+		}
+	}
+}
+#endif /* DEVICE_POLLING */
+
+static void
+ste_intr(xsc)
+	void			*xsc;
+{
+	struct ste_softc	*sc;
+	struct ifnet		*ifp;
+	u_int16_t		status;
+
+	sc = xsc;
+	STE_LOCK(sc);
+	ifp = sc->ste_ifp;
+
+#ifdef DEVICE_POLLING
+	if (ifp->if_capenable & IFCAP_POLLING) {
+		STE_UNLOCK(sc);
+		return;
+	}
+#endif
+
+	/* See if this is really our interrupt. */
+	if (!(CSR_READ_2(sc, STE_ISR) & STE_ISR_INTLATCH)) {
+		STE_UNLOCK(sc);
+		return;
+	}
+
+	for (;;) {
+		status = CSR_READ_2(sc, STE_ISR_ACK);
+
+		if (!(status & STE_INTRS))
+			break;
+
+		if (status & STE_ISR_RX_DMADONE) {
+			ste_rxeoc(sc);
+			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) {
+			callout_stop(&sc->ste_stat_callout);
+			ste_stats_update(sc);
+		}
+
+		if (status & STE_ISR_LINKEVENT)
+			mii_pollstat(device_get_softc(sc->ste_miibus));
+
+
+		if (status & STE_ISR_HOSTERR) {
+			ste_reset(sc);
+			ste_init_locked(sc);
+		}
+	}
+
+	/* Re-enable interrupts */
+	CSR_WRITE_2(sc, STE_IMR, STE_INTRS);
+
+	if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
+		ste_start_locked(ifp);
+
+	STE_UNLOCK(sc);
+
+	return;
+}
+
+static void
+ste_rxeoc(struct ste_softc *sc)
+{
+	struct ste_chain_onefrag *cur_rx;
+
+	STE_LOCK_ASSERT(sc);
+
+	if (sc->ste_cdata.ste_rx_head->ste_ptr->ste_status == 0) {
+		cur_rx = sc->ste_cdata.ste_rx_head;
+		do {
+			cur_rx = cur_rx->ste_next;
+			/* If the ring is empty, just return. */
+			if (cur_rx == sc->ste_cdata.ste_rx_head)
+				return;
+		} while (cur_rx->ste_ptr->ste_status == 0);
+		if (sc->ste_cdata.ste_rx_head->ste_ptr->ste_status == 0) {
+			/* We've fallen behind the chip: catch it. */
+			sc->ste_cdata.ste_rx_head = cur_rx;
+			++ste_rxsyncs;
+		}
+	}
+}
+
+/*
+ * 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 mbuf		*m;
+        struct ifnet		*ifp;
+	struct ste_chain_onefrag	*cur_rx;
+	int			total_len = 0, count=0;
+	u_int32_t		rxstat;
+
+	STE_LOCK_ASSERT(sc);
+
+	ifp = sc->ste_ifp;
+
+	while((rxstat = sc->ste_cdata.ste_rx_head->ste_ptr->ste_status)
+	      & STE_RXSTAT_DMADONE) {
+#ifdef DEVICE_POLLING
+		if (ifp->if_capenable & IFCAP_POLLING) {
+			if (sc->rxcycles <= 0)
+				break;
+			sc->rxcycles--;
+		}
+#endif
+		if ((STE_RX_LIST_CNT - count) < 3) {
+			break;
+		}
+
+		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)) {
+			device_printf(sc->ste_dev,
+			    "bad receive status -- packet dropped\n");
+			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;
+		}
+
+		m->m_pkthdr.rcvif = ifp;
+		m->m_pkthdr.len = m->m_len = total_len;
+
+		ifp->if_ipackets++;
+		STE_UNLOCK(sc);
+		(*ifp->if_input)(ifp, m);
+		STE_LOCK(sc);
+
+		cur_rx->ste_ptr->ste_status = 0;
+		count++;
+	}
+
+	return;
+}
+
+static void
+ste_txeoc(sc)
+	struct ste_softc	*sc;
+{
+	u_int8_t		txstat;
+	struct ifnet		*ifp;
+
+	ifp = sc->ste_ifp;
+
+	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++;
+			device_printf(sc->ste_dev,
+			    "transmission error: %x\n", txstat);
+
+			ste_reset(sc);
+			ste_init_locked(sc);
+
+			if (txstat & STE_TXSTATUS_UNDERRUN &&
+			    sc->ste_tx_thresh < STE_PACKET_SIZE) {
+				sc->ste_tx_thresh += STE_MIN_FRAMELEN;
+				device_printf(sc->ste_dev,
+				    "tx underrun, increasing tx"
+				    " start threshold to %d bytes\n",
+				    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_init_locked(sc);
+		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;
+	int			idx;
+
+	ifp = sc->ste_ifp;
+
+	idx = sc->ste_cdata.ste_tx_cons;
+	while(idx != sc->ste_cdata.ste_tx_prod) {
+		cur_tx = &sc->ste_cdata.ste_tx_chain[idx];
+
+		if (!(cur_tx->ste_ptr->ste_ctl & STE_TXCTL_DMADONE))
+			break;
+
+		m_freem(cur_tx->ste_mbuf);
+		cur_tx->ste_mbuf = NULL;
+		ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
+		ifp->if_opackets++;
+
+		STE_INC(idx, STE_TX_LIST_CNT);
+	}
+
+	sc->ste_cdata.ste_tx_cons = idx;
+	if (idx == sc->ste_cdata.ste_tx_prod)
+		ifp->if_timer = 0;
+}
+
+static void
+ste_stats_update(xsc)
+	void			*xsc;
+{
+	struct ste_softc	*sc;
+	struct ifnet		*ifp;
+	struct mii_data		*mii;
+
+	sc = xsc;
+	STE_LOCK_ASSERT(sc);
+
+	ifp = sc->ste_ifp;
+	mii = device_get_softc(sc->ste_miibus);
+
+	ifp->if_collisions += CSR_READ_1(sc, STE_LATE_COLLS)
+	    + CSR_READ_1(sc, STE_MULTI_COLLS)
+	    + CSR_READ_1(sc, STE_SINGLE_COLLS);
+
+	if (!sc->ste_link) {
+		mii_pollstat(mii);
+		if (mii->mii_media_status & IFM_ACTIVE &&
+		    IFM_SUBTYPE(mii->mii_media_active) != IFM_NONE) {
+			sc->ste_link++;
+			/*
+			* we don't get a call-back on re-init so do it
+			* otherwise we get stuck in the wrong link state
+			*/
+			ste_miibus_statchg(sc->ste_dev);
+			if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
+				ste_start_locked(ifp);
+		}
+	}
+
+	callout_reset(&sc->ste_stat_callout, hz, ste_stats_update, sc);
+
+	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 (BUS_PROBE_DEFAULT);
+		}
+		t++;
+	}
+
+	return(ENXIO);
+}
+
+/*
+ * Attach the interface. Allocate softc structures, do ifmedia
+ * setup and ethernet/BPF attach.
+ */
+static int
+ste_attach(dev)
+	device_t		dev;
+{
+	struct ste_softc	*sc;
+	struct ifnet		*ifp;
+	int			error = 0, rid;
+	u_char			eaddr[6];
+
+	sc = device_get_softc(dev);
+	sc->ste_dev = dev;
+
+	/*
+	 * Only use one PHY since this chip reports multiple
+	 * Note on the DFE-550 the PHY is at 1 on the DFE-580
+	 * it is at 0 & 1.  It is rev 0x12.
+	 */
+	if (pci_get_vendor(dev) == DL_VENDORID &&
+	    pci_get_device(dev) == DL_DEVICEID_DL10050 &&
+	    pci_get_revid(dev) == 0x12 )
+		sc->ste_one_phy = 1;
+
+	mtx_init(&sc->ste_mtx, device_get_nameunit(dev), MTX_NETWORK_LOCK,
+	    MTX_DEF);
+	/*
+	 * Map control/status registers.
+	 */
+	pci_enable_busmaster(dev);
+
+	rid = STE_RID;
+	sc->ste_res = bus_alloc_resource_any(dev, STE_RES, &rid, RF_ACTIVE);
+
+	if (sc->ste_res == NULL) {
+		device_printf(dev, "couldn't map ports/memory\n");
+		error = ENXIO;
+		goto fail;
+	}
+
+	sc->ste_btag = rman_get_bustag(sc->ste_res);
+	sc->ste_bhandle = rman_get_bushandle(sc->ste_res);
+
+	/* Allocate interrupt */
+	rid = 0;
+	sc->ste_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
+	    RF_SHAREABLE | RF_ACTIVE);
+
+	if (sc->ste_irq == NULL) {
+		device_printf(dev, "couldn't map interrupt\n");
+		error = ENXIO;
+		goto fail;
+	}
+
+	callout_init_mtx(&sc->ste_stat_callout, &sc->ste_mtx, 0);
+
+	/* Reset the adapter. */
+	ste_reset(sc);
+
+	/*
+	 * Get station address from the EEPROM.
+	 */
+	if (ste_read_eeprom(sc, eaddr,
+	    STE_EEADDR_NODE0, 3, 0)) {
+		device_printf(dev, "failed to read station address\n");
+		error = ENXIO;;
+		goto fail;
+	}
+
+	/* Allocate the descriptor queues. */
+	sc->ste_ldata = contigmalloc(sizeof(struct ste_list_data), M_DEVBUF,
+	    M_NOWAIT, 0, 0xffffffff, PAGE_SIZE, 0);
+
+	if (sc->ste_ldata == NULL) {
+		device_printf(dev, "no memory for list buffers!\n");
+		error = ENXIO;
+		goto fail;
+	}
+
+	bzero(sc->ste_ldata, sizeof(struct ste_list_data));
+
+	ifp = sc->ste_ifp = if_alloc(IFT_ETHER);
+	if (ifp == NULL) {
+		device_printf(dev, "can not if_alloc()\n");
+		error = ENOSPC;
+		goto fail;
+	}
+
+	/* Do MII setup. */
+	if (mii_phy_probe(dev, &sc->ste_miibus,
+	    ste_ifmedia_upd, ste_ifmedia_sts)) {
+		device_printf(dev, "MII without any phy!\n");
+		error = ENXIO;
+		goto fail;
+	}
+
+	ifp->if_softc = sc;
+	if_initname(ifp, device_get_name(dev), device_get_unit(dev));
+	ifp->if_mtu = ETHERMTU;
+	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
+	ifp->if_ioctl = ste_ioctl;
+	ifp->if_start = ste_start;
+	ifp->if_watchdog = ste_watchdog;
+	ifp->if_init = ste_init;
+	IFQ_SET_MAXLEN(&ifp->if_snd, STE_TX_LIST_CNT - 1);
+	ifp->if_snd.ifq_drv_maxlen = STE_TX_LIST_CNT - 1;
+	IFQ_SET_READY(&ifp->if_snd);
+
+	sc->ste_tx_thresh = STE_TXSTART_THRESH;
+
+	/*
+	 * Call MI attach routine.
+	 */
+	ether_ifattach(ifp, eaddr);
+
+	/*
+	 * Tell the upper layer(s) we support long frames.
+	 */
+	ifp->if_data.ifi_hdrlen = sizeof(struct ether_vlan_header);
+	ifp->if_capabilities |= IFCAP_VLAN_MTU;
+	ifp->if_capenable = ifp->if_capabilities;
+#ifdef DEVICE_POLLING
+	ifp->if_capabilities |= IFCAP_POLLING;
+#endif
+
+	/* Hook interrupt last to avoid having to lock softc */
+	error = bus_setup_intr(dev, sc->ste_irq, INTR_TYPE_NET | INTR_MPSAFE,
+	    NULL, ste_intr, sc, &sc->ste_intrhand);
+
+	if (error) {
+		device_printf(dev, "couldn't set up irq\n");
+		ether_ifdetach(ifp);
+		goto fail;
+	}
+
+fail:
+	if (error)
+		ste_detach(dev);
+
+	return(error);
+}
+
+/*
+ * Shutdown hardware and free up resources. This can be called any
+ * time after the mutex has been initialized. It is called in both
+ * the error case in attach and the normal detach case so it needs
+ * to be careful about only freeing resources that have actually been
+ * allocated.
+ */
+static int
+ste_detach(dev)
+	device_t		dev;
+{
+	struct ste_softc	*sc;
+	struct ifnet		*ifp;
+
+	sc = device_get_softc(dev);
+	KASSERT(mtx_initialized(&sc->ste_mtx), ("ste mutex not initialized"));
+	ifp = sc->ste_ifp;
+
+#ifdef DEVICE_POLLING
+	if (ifp->if_capenable & IFCAP_POLLING)
+		ether_poll_deregister(ifp);
+#endif
+
+	/* These should only be active if attach succeeded */
+	if (device_is_attached(dev)) {
+		STE_LOCK(sc);
+		ste_stop(sc);
+		STE_UNLOCK(sc);
+		callout_drain(&sc->ste_stat_callout);
+		ether_ifdetach(ifp);
+	}
+	if (sc->ste_miibus)
+		device_delete_child(dev, sc->ste_miibus);
+	bus_generic_detach(dev);
+
+	if (sc->ste_intrhand)
+		bus_teardown_intr(dev, sc->ste_irq, sc->ste_intrhand);
+	if (sc->ste_irq)
+		bus_release_resource(dev, SYS_RES_IRQ, 0, sc->ste_irq);
+	if (sc->ste_res)
+		bus_release_resource(dev, STE_RES, STE_RID, sc->ste_res);
+
+	if (ifp)
+		if_free(ifp);
+
+	if (sc->ste_ldata) {
+		contigfree(sc->ste_ldata, sizeof(struct ste_list_data),
+		    M_DEVBUF);
+	}
+
+	mtx_destroy(&sc->ste_mtx);
+
+	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)
+			return(ENOBUFS);
+		MCLGET(m_new, M_DONTWAIT);
+		if (!(m_new->m_flags & M_EXT)) {
+			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 + ETHER_VLAN_ENCAP_LEN) | 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]);
+		}
+		ld->ste_rx_list[i].ste_status = 0;
+	}
+
+	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];
+		cd->ste_tx_chain[i].ste_ptr->ste_next = 0;
+		cd->ste_tx_chain[i].ste_ptr->ste_ctl  = 0;
+		cd->ste_tx_chain[i].ste_phys = vtophys(&ld->ste_tx_list[i]);
+		if (i == (STE_TX_LIST_CNT - 1))
+			cd->ste_tx_chain[i].ste_next =
+			    &cd->ste_tx_chain[0];
+		else
+			cd->ste_tx_chain[i].ste_next =
+			    &cd->ste_tx_chain[i + 1];
+	}
+
+	cd->ste_tx_prod = 0;
+	cd->ste_tx_cons = 0;
+
+	return;
+}
+
+static void
+ste_init(xsc)
+	void			*xsc;
+{
+	struct ste_softc	*sc;
+
+	sc = xsc;
+	STE_LOCK(sc);
+	ste_init_locked(sc);
+	STE_UNLOCK(sc);
+}
+
+static void
+ste_init_locked(sc)
+	struct ste_softc	*sc;
+{
+	int			i;
+	struct ifnet		*ifp;
+
+	STE_LOCK_ASSERT(sc);
+	ifp = sc->ste_ifp;
+
+	ste_stop(sc);
+
+	/* Init our MAC address */
+	for (i = 0; i < ETHER_ADDR_LEN; i += 2) {
+		CSR_WRITE_2(sc, STE_PAR0 + i,
+		    ((IF_LLADDR(sc->ste_ifp)[i] & 0xff) |
+		     IF_LLADDR(sc->ste_ifp)[i + 1] << 8));
+	}
+
+	/* Init RX list */
+	if (ste_init_rx_list(sc) == ENOBUFS) {
+		device_printf(sc->ste_dev,
+		    "initialization failed: no memory for RX buffers\n");
+		ste_stop(sc);
+		return;
+	}
+
+	/* Set RX polling interval */
+	CSR_WRITE_1(sc, STE_RX_DMAPOLL_PERIOD, 64);
+
+	/* 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. */
+	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);
+
+	/* Set TX polling interval (defer until we TX first packet */
+	CSR_WRITE_1(sc, STE_TX_DMAPOLL_PERIOD, 0);
+
+	/* Load address of the TX list */
+	STE_SETBIT4(sc, STE_DMACTL, STE_DMACTL_TXDMA_STALL);
+	ste_wait(sc);
+	CSR_WRITE_4(sc, STE_TX_DMALIST_PTR, 0);
+	STE_SETBIT4(sc, STE_DMACTL, STE_DMACTL_TXDMA_UNSTALL);
+	STE_SETBIT4(sc, STE_DMACTL, STE_DMACTL_TXDMA_UNSTALL);
+	ste_wait(sc);
+	sc->ste_tx_prev = NULL;
+
+	/* Enable receiver and transmitter */
+	CSR_WRITE_2(sc, STE_MACCTL0, 0);
+	CSR_WRITE_2(sc, STE_MACCTL1, 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);
+
+	CSR_WRITE_2(sc, STE_ISR, 0xFFFF);
+#ifdef DEVICE_POLLING
+	/* Disable interrupts if we are polling. */
+	if (ifp->if_capenable & IFCAP_POLLING)
+		CSR_WRITE_2(sc, STE_IMR, 0);
+	else   
+#endif
+	/* Enable interrupts. */
+	CSR_WRITE_2(sc, STE_IMR, STE_INTRS);
+
+	/* Accept VLAN length packets */
+	CSR_WRITE_2(sc, STE_MAX_FRAMELEN, ETHER_MAX_LEN + ETHER_VLAN_ENCAP_LEN);
+
+	ste_ifmedia_upd_locked(ifp);
+
+	ifp->if_drv_flags |= IFF_DRV_RUNNING;
+	ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
+
+	callout_reset(&sc->ste_stat_callout, hz, ste_stats_update, sc);
+
+	return;
+}
+
+static void
+ste_stop(sc)
+	struct ste_softc	*sc;
+{
+	int			i;
+	struct ifnet		*ifp;
+
+	STE_LOCK_ASSERT(sc);
+	ifp = sc->ste_ifp;
+
+	callout_stop(&sc->ste_stat_callout);
+	ifp->if_drv_flags &= ~(IFF_DRV_RUNNING|IFF_DRV_OACTIVE);
+
+	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);
+	/* 
+	 * Try really hard to stop the RX engine or under heavy RX 
+	 * data chip will write into de-allocated memory.
+	 */
+	ste_reset(sc);
+
+	sc->ste_link = 0;
+
+	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;
+		}
+	}
+
+	bzero(sc->ste_ldata, sizeof(struct ste_list_data));
+
+	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)
+		device_printf(sc->ste_dev, "global reset never completed\n");
+
+	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;
+
+	sc = ifp->if_softc;
+	ifr = (struct ifreq *)data;
+
+	switch(command) {
+	case SIOCSIFFLAGS:
+		STE_LOCK(sc);
+		if (ifp->if_flags & IFF_UP) {
+			if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
+			    ifp->if_flags & IFF_PROMISC &&
+			    !(sc->ste_if_flags & IFF_PROMISC)) {
+				STE_SETBIT1(sc, STE_RX_MODE,
+				    STE_RXMODE_PROMISC);
+			} else if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
+			    !(ifp->if_flags & IFF_PROMISC) &&
+			    sc->ste_if_flags & IFF_PROMISC) {
+				STE_CLRBIT1(sc, STE_RX_MODE,
+				    STE_RXMODE_PROMISC);
+			} 
+			if (ifp->if_drv_flags & IFF_DRV_RUNNING &&
+			    (ifp->if_flags ^ sc->ste_if_flags) & IFF_ALLMULTI)
+				ste_setmulti(sc);
+			if (!(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
+				sc->ste_tx_thresh = STE_TXSTART_THRESH;
+				ste_init_locked(sc);
+			}
+		} else {
+			if (ifp->if_drv_flags & IFF_DRV_RUNNING)
+				ste_stop(sc);
+		}
+		sc->ste_if_flags = ifp->if_flags;
+		STE_UNLOCK(sc);
+		error = 0;
+		break;
+	case SIOCADDMULTI:
+	case SIOCDELMULTI:
+		STE_LOCK(sc);
+		ste_setmulti(sc);
+		STE_UNLOCK(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;
+	case SIOCSIFCAP:
+#ifdef DEVICE_POLLING
+		if (ifr->ifr_reqcap & IFCAP_POLLING &&
+		    !(ifp->if_capenable & IFCAP_POLLING)) {
+			error = ether_poll_register(ste_poll, ifp);
+			if (error)
+				return(error);
+			STE_LOCK(sc);
+			/* Disable interrupts */
+			CSR_WRITE_2(sc, STE_IMR, 0);
+			ifp->if_capenable |= IFCAP_POLLING;
+			STE_UNLOCK(sc);
+			return (error);
+			
+		}
+		if (!(ifr->ifr_reqcap & IFCAP_POLLING) &&
+		    ifp->if_capenable & IFCAP_POLLING) {
+			error = ether_poll_deregister(ifp);
+			/* Enable interrupts. */
+			STE_LOCK(sc);
+			CSR_WRITE_2(sc, STE_IMR, STE_INTRS);
+			ifp->if_capenable &= ~IFCAP_POLLING;
+			STE_UNLOCK(sc);
+			return (error);
+		}
+#endif /* DEVICE_POLLING */
+		break;
+	default:
+		error = ether_ioctl(ifp, command, data);
+		break;
+	}
+
+	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;
+	struct mbuf		*m;
+	struct ste_desc		*d;
+
+	d = c->ste_ptr;
+	d->ste_ctl = 0;
+
+encap_retry:
+	for (m = m_head, frag = 0; m != NULL; m = m->m_next) {
+		if (m->m_len != 0) {
+			if (frag == STE_MAXFRAGS)
+				break;
+			f = &d->ste_frags[frag];
+			f->ste_addr = vtophys(mtod(m, vm_offset_t));
+			f->ste_len = m->m_len;
+			frag++;
+		}
+	}
+
+	if (m != NULL) {
+		struct mbuf *mn;
+
+		/*
+		 * We ran out of segments. We have to recopy this
+		 * mbuf chain first. Bail out if we can't get the
+		 * new buffers.
+		 */
+		mn = m_defrag(m_head, M_DONTWAIT);
+		if (mn == NULL) {
+			m_freem(m_head);
+			return ENOMEM;
+		}
+		m_head = mn;
+		goto encap_retry;
+	}
+
+	c->ste_mbuf = m_head;
+	d->ste_frags[frag - 1].ste_len |= STE_FRAG_LAST;
+	d->ste_ctl = 1;
+
+	return(0);
+}
+
+static void
+ste_start(ifp)
+	struct ifnet		*ifp;
+{
+	struct ste_softc	*sc;
+
+	sc = ifp->if_softc;
+	STE_LOCK(sc);
+	ste_start_locked(ifp);
+	STE_UNLOCK(sc);
+}
+
+static void
+ste_start_locked(ifp)
+	struct ifnet		*ifp;
+{
+	struct ste_softc	*sc;
+	struct mbuf		*m_head = NULL;
+	struct ste_chain	*cur_tx;
+	int			idx;
+
+	sc = ifp->if_softc;
+	STE_LOCK_ASSERT(sc);
+
+	if (!sc->ste_link)
+		return;
+
+	if (ifp->if_drv_flags & IFF_DRV_OACTIVE)
+		return;
+
+	idx = sc->ste_cdata.ste_tx_prod;
+
+	while(sc->ste_cdata.ste_tx_chain[idx].ste_mbuf == NULL) {
+		/*
+		 * We cannot re-use the last (free) descriptor;
+		 * the chip may not have read its ste_next yet.
+		 */
+		if (STE_NEXT(idx, STE_TX_LIST_CNT) ==
+		    sc->ste_cdata.ste_tx_cons) {
+			ifp->if_drv_flags |= IFF_DRV_OACTIVE;
+			break;
+		}
+
+		IFQ_DRV_DEQUEUE(&ifp->if_snd, m_head);
+		if (m_head == NULL)
+			break;
+
+		cur_tx = &sc->ste_cdata.ste_tx_chain[idx];
+
+		if (ste_encap(sc, cur_tx, m_head) != 0)
+			break;
+
+		cur_tx->ste_ptr->ste_next = 0;
+
+		if (sc->ste_tx_prev == NULL) {
+			cur_tx->ste_ptr->ste_ctl = STE_TXCTL_DMAINTR | 1;
+			/* Load address of the TX list */
+			STE_SETBIT4(sc, STE_DMACTL, STE_DMACTL_TXDMA_STALL);
+			ste_wait(sc);
+
+			CSR_WRITE_4(sc, STE_TX_DMALIST_PTR,
+			    vtophys(&sc->ste_ldata->ste_tx_list[0]));
+
+			/* Set TX polling interval to start TX engine */
+			CSR_WRITE_1(sc, STE_TX_DMAPOLL_PERIOD, 64);
+		  
+			STE_SETBIT4(sc, STE_DMACTL, STE_DMACTL_TXDMA_UNSTALL);
+			ste_wait(sc);
+		}else{
+			cur_tx->ste_ptr->ste_ctl = STE_TXCTL_DMAINTR | 1;
+			sc->ste_tx_prev->ste_ptr->ste_next
+				= cur_tx->ste_phys;
+		}
+
+		sc->ste_tx_prev = cur_tx;
+
+		/*
+		 * If there's a BPF listener, bounce a copy of this frame
+		 * to him.
+	 	 */
+		BPF_MTAP(ifp, cur_tx->ste_mbuf);
+
+		STE_INC(idx, STE_TX_LIST_CNT);
+		ifp->if_timer = 5;
+	}
+	sc->ste_cdata.ste_tx_prod = idx;
+
+	return;
+}
+
+static void
+ste_watchdog(ifp)
+	struct ifnet		*ifp;
+{
+	struct ste_softc	*sc;
+
+	sc = ifp->if_softc;
+	STE_LOCK(sc);
+
+	ifp->if_oerrors++;
+	if_printf(ifp, "watchdog timeout\n");
+
+	ste_txeoc(sc);
+	ste_txeof(sc);
+	ste_rxeoc(sc);
+	ste_rxeof(sc);
+	ste_reset(sc);
+	ste_init_locked(sc);
+
+	if (!IFQ_DRV_IS_EMPTY(&ifp->if_snd))
+		ste_start_locked(ifp);
+	STE_UNLOCK(sc);
+
+	return;
+}
+
+static int
+ste_shutdown(dev)
+	device_t		dev;
+{
+	struct ste_softc	*sc;
+
+	sc = device_get_softc(dev);
+
+	STE_LOCK(sc);
+	ste_stop(sc);
+	STE_UNLOCK(sc);
+
+	return (0);
+}