path: root/sys/dev/pci/if_al.c

/*	$OpenBSD: if_al.c,v 1.4 1999/12/08 00:38:07 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_al.c,v 1.14 1999/09/25 17:29:01 wpaul Exp $
 */

/*
 * ADMtek AL981 Comet and AN985 Centaur fast ethernet PCI NIC driver.
 * Datasheets for the AL981 are available from http://www.admtek.com.tw.
 *
 * Written by Bill Paul <wpaul@ee.columbia.edu>
 * Electrical Engineering Department
 * Columbia University, New York City
 */

/*
 * The ADMtek AL981 Comet is still another DEC 21x4x clone. It's
 * a reasonably close copy of the tulip, except for the receiver filter
 * programming. Where the DEC chip has a special setup frame that
 * needs to be downloaded into the transmit DMA engine, the ADMtek chip
 * has physical address and multicast address registers.
 *
 * The AN985 is an update to the AL981 which is mostly the same, except
 * for the following things:
 * - The AN985 uses a 99C66 EEPROM which requires a slightly different
 *   bit sequence to initiate a read.
 * - The AN985 uses a serial MII interface instead of providing direct
 *   access to the PHY registers (it uses an internal PHY though).
 * Although the datasheet for the AN985 is not yet available, you can
 * use an AL981 datasheet as a reference for most of the chip functions,
 * except for the MII interface which matches the DEC 21x4x specification
 * (bits 16, 17, 18 and 19 in the serial I/O register control the MII).
 */

#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>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>

#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>

/* Enable workaround for small transmitter bug. */
#define AL_TX_STALL_WAR

#define AL_USEIOSPACE

#include <dev/pci/if_alreg.h>

int al_probe		__P((struct device *, void *, void *));
void al_attach		__P((struct device *, struct device *, void *));
int al_intr		__P((void *));
void al_shutdown	__P((void *));
int al_newbuf		__P((struct al_softc *, struct al_desc *,
				struct mbuf *));
int al_encap		__P((struct al_softc *, struct mbuf *, u_int32_t *));
void al_rxeof		__P((struct al_softc *));
void al_txeof		__P((struct al_softc *));
void al_tick		__P((void *));
void al_start		__P((struct ifnet *));
int al_ioctl		__P((struct ifnet *, u_long, caddr_t));
void al_init		__P((void *));
void al_stop		__P((struct al_softc *));
void al_watchdog	__P((struct ifnet *));
int al_ifmedia_upd	__P((struct ifnet *));
void al_ifmedia_sts	__P((struct ifnet *, struct ifmediareq *));

void al_delay		__P((struct al_softc *));
void al_eeprom_idle	__P((struct al_softc *));
void al_eeprom_putbyte	__P((struct al_softc *, int));
void al_eeprom_getword	__P((struct al_softc *, int, u_int16_t *));
void al_read_eeprom	__P((struct al_softc *, caddr_t, int, int, int));

void al_mii_writebit	__P((struct al_softc *, int));
int al_mii_readbit	__P((struct al_softc *));
void al_mii_sync	__P((struct al_softc *));
void al_mii_send	__P((struct al_softc *, u_int32_t, int));
int al_mii_readreg	__P((struct al_softc *, struct al_mii_frame *));
int al_mii_writereg	__P((struct al_softc *, struct al_mii_frame *));

int al_miibus_readreg	__P((struct device *, int, int));
void al_miibus_writereg	__P((struct device *, int, int, int));
void al_miibus_statchg	__P((struct device *));

u_int32_t al_calchash	__P((caddr_t));
void al_setmulti	__P((struct al_softc *));
void al_reset		__P((struct al_softc *));
int al_list_rx_init	__P((struct al_softc *));
int al_list_tx_init	__P((struct al_softc *));

#define AL_SETBIT(sc, reg, x)				\
	CSR_WRITE_4(sc, reg,				\
		CSR_READ_4(sc, reg) | x)

#define AL_CLRBIT(sc, reg, x)				\
	CSR_WRITE_4(sc, reg,				\
		CSR_READ_4(sc, reg) & ~x)

#define SIO_SET(x)					\
	CSR_WRITE_4(sc, AL_SIO,				\
		CSR_READ_4(sc, AL_SIO) | x)

#define SIO_CLR(x)					\
	CSR_WRITE_4(sc, AL_SIO,				\
		CSR_READ_4(sc, AL_SIO) & ~x)

void al_delay(sc)
	struct al_softc		*sc;
{
	int			idx;

	for (idx = (300 / 33) + 1; idx > 0; idx--)
		CSR_READ_4(sc, AL_BUSCTL);
}

void al_eeprom_idle(sc)
	struct al_softc		*sc;
{
	register int		i;

	CSR_WRITE_4(sc, AL_SIO, AL_SIO_EESEL);
	al_delay(sc);
	AL_SETBIT(sc, AL_SIO,  AL_SIO_ROMCTL_READ);
	al_delay(sc);
	AL_SETBIT(sc, AL_SIO, AL_SIO_EE_CS);
	al_delay(sc);
	AL_SETBIT(sc, AL_SIO, AL_SIO_EE_CLK);
	al_delay(sc);

	for (i = 0; i < 25; i++) {
		AL_CLRBIT(sc, AL_SIO, AL_SIO_EE_CLK);
		al_delay(sc);
		AL_SETBIT(sc, AL_SIO, AL_SIO_EE_CLK);
		al_delay(sc);
	}

	AL_CLRBIT(sc, AL_SIO, AL_SIO_EE_CLK);
	al_delay(sc);
	AL_CLRBIT(sc, AL_SIO, AL_SIO_EE_CS);
	al_delay(sc);
	CSR_WRITE_4(sc, AL_SIO, 0x00000000);

	return;
}

/*
 * Send a read command and address to the EEPROM, check for ACK.
 */
void al_eeprom_putbyte(sc, addr)
	struct al_softc		*sc;
	int			addr;
{
	register int		d, i;

	/*
	 * The AN985 has a 99C66 EEPROM on it instead of
	 * a 99C64. It uses a different bit sequence for
	 * specifying the "read" opcode.
	 */
	if (sc->al_did == PCI_PRODUCT_ADMTEK_AN985)
		d = addr | (AL_EECMD_READ << 2);
	else
		d = addr | AL_EECMD_READ;

	/*
	 * Feed in each bit and stobe the clock.
	 */
	for (i = 0x400; i; i >>= 1) {
		if (d & i) {
			SIO_SET(AL_SIO_EE_DATAIN);
		} else {
			SIO_CLR(AL_SIO_EE_DATAIN);
		}
		al_delay(sc);
		SIO_SET(AL_SIO_EE_CLK);
		al_delay(sc);
		SIO_CLR(AL_SIO_EE_CLK);
		al_delay(sc);
	}

	return;
}

/*
 * Read a word of data stored in the EEPROM at address 'addr.'
 */
void al_eeprom_getword(sc, addr, dest)
	struct al_softc		*sc;
	int			addr;
	u_int16_t		*dest;
{
	register int		i;
	u_int16_t		word = 0;

	/* Force EEPROM to idle state. */
	al_eeprom_idle(sc);

	/* Enter EEPROM access mode. */
	CSR_WRITE_4(sc, AL_SIO, AL_SIO_EESEL);
	al_delay(sc);
	AL_SETBIT(sc, AL_SIO,  AL_SIO_ROMCTL_READ);
	al_delay(sc);
	AL_SETBIT(sc, AL_SIO, AL_SIO_EE_CS);
	al_delay(sc);
	AL_CLRBIT(sc, AL_SIO, AL_SIO_EE_CLK);
	al_delay(sc);

	/*
	 * Send address of word we want to read.
	 */
	al_eeprom_putbyte(sc, addr);

	/*
	 * Start reading bits from EEPROM.
	 */
	for (i = 0x8000; i; i >>= 1) {
		SIO_SET(AL_SIO_EE_CLK);
		al_delay(sc);
		if (CSR_READ_4(sc, AL_SIO) & AL_SIO_EE_DATAOUT)
			word |= i;
		al_delay(sc);
		SIO_CLR(AL_SIO_EE_CLK);
		al_delay(sc);
	}

	/* Turn off EEPROM access mode. */
	al_eeprom_idle(sc);

	*dest = word;

	return;
}

/*
 * Read a sequence of words from the EEPROM.
 */
void al_read_eeprom(sc, dest, off, cnt, swap)
	struct al_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++) {
		al_eeprom_getword(sc, off + i, &word);
		ptr = (u_int16_t *)(dest + (i * 2));
		if (swap)
			*ptr = ntohs(word);
		else
			*ptr = word;
	}

	return;
}

/*
 * Write a bit to the MII bus.
 */
void al_mii_writebit(sc, bit)
	struct al_softc		*sc;
	int			bit;
{
	if (bit)
		CSR_WRITE_4(sc, AL_SIO, AL_SIO_ROMCTL_WRITE|AL_SIO_MII_DATAOUT);
	else
		CSR_WRITE_4(sc, AL_SIO, AL_SIO_ROMCTL_WRITE);

	AL_SETBIT(sc, AL_SIO, AL_SIO_MII_CLK);
	AL_CLRBIT(sc, AL_SIO, AL_SIO_MII_CLK);

	return;
}

/*
 * Read a bit from the MII bus.
 */
int al_mii_readbit(sc)
	struct al_softc		*sc;
{
	CSR_WRITE_4(sc, AL_SIO, AL_SIO_ROMCTL_READ|AL_SIO_MII_DIR);
	CSR_READ_4(sc, AL_SIO);
	AL_SETBIT(sc, AL_SIO, AL_SIO_MII_CLK);
	AL_CLRBIT(sc, AL_SIO, AL_SIO_MII_CLK);
	if (CSR_READ_4(sc, AL_SIO) & AL_SIO_MII_DATAIN)
		return(1);

	return(0);
}

/*
 * Sync the PHYs by setting data bit and strobing the clock 32 times.
 */
void al_mii_sync(sc)
	struct al_softc		*sc;
{
	register int		i;

	CSR_WRITE_4(sc, AL_SIO, AL_SIO_ROMCTL_WRITE);

	for (i = 0; i < 32; i++)
		al_mii_writebit(sc, 1);

	return;
}

/*
 * Clock a series of bits through the MII.
 */
void al_mii_send(sc, bits, cnt)
	struct al_softc		*sc;
	u_int32_t		bits;
	int			cnt;
{
	int			i;

	for (i = (0x1 << (cnt - 1)); i; i >>= 1)
		al_mii_writebit(sc, bits & i);
}

/*
 * Read an PHY register through the MII.
 */
int al_mii_readreg(sc, frame)
	struct al_softc		*sc;
	struct al_mii_frame	*frame;
	
{
	int			i, ack, s;

	s = splimp();

	/*
	 * Set up frame for RX.
	 */
	frame->mii_stdelim = AL_MII_STARTDELIM;
	frame->mii_opcode = AL_MII_READOP;
	frame->mii_turnaround = 0;
	frame->mii_data = 0;
	
	/*
	 * Sync the PHYs.
	 */
	al_mii_sync(sc);

	/*
	 * Send command/address info.
	 */
	al_mii_send(sc, frame->mii_stdelim, 2);
	al_mii_send(sc, frame->mii_opcode, 2);
	al_mii_send(sc, frame->mii_phyaddr, 5);
	al_mii_send(sc, frame->mii_regaddr, 5);

#ifdef notdef
	/* Idle bit */
	al_mii_writebit(sc, 1);
	al_mii_writebit(sc, 0);
#endif

	/* Check for ack */
	ack = al_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++) {
			al_mii_readbit(sc);
		}
		goto fail;
	}

	for (i = 0x8000; i; i >>= 1) {
		if (!ack) {
			if (al_mii_readbit(sc))
				frame->mii_data |= i;
		}
	}

fail:

	al_mii_writebit(sc, 0);
	al_mii_writebit(sc, 0);

	splx(s);

	if (ack)
		return(1);
	return(0);
}

/*
 * Write to a PHY register through the MII.
 */
int al_mii_writereg(sc, frame)
	struct al_softc		*sc;
	struct al_mii_frame	*frame;
	
{
	int			s;

	s = splimp();
	/*
	 * Set up frame for TX.
	 */

	frame->mii_stdelim = AL_MII_STARTDELIM;
	frame->mii_opcode = AL_MII_WRITEOP;
	frame->mii_turnaround = AL_MII_TURNAROUND;

	/*
	 * Sync the PHYs.
	 */	
	al_mii_sync(sc);

	al_mii_send(sc, frame->mii_stdelim, 2);
	al_mii_send(sc, frame->mii_opcode, 2);
	al_mii_send(sc, frame->mii_phyaddr, 5);
	al_mii_send(sc, frame->mii_regaddr, 5);
	al_mii_send(sc, frame->mii_turnaround, 2);
	al_mii_send(sc, frame->mii_data, 16);

	/* Idle bit. */
	al_mii_writebit(sc, 0);
	al_mii_writebit(sc, 0);

	splx(s);

	return(0);
}

int al_miibus_readreg(self, phy, reg)
	struct device		*self;
	int			phy, reg;
{
	struct al_mii_frame	frame;
	u_int16_t		rval = 0;
	u_int16_t		phy_reg = 0;
	struct al_softc		*sc = (struct al_softc *)self;

	/*
	 * 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 (phy != 1)
		return(0);

	if (sc->al_did == PCI_PRODUCT_ADMTEK_AN985) {
		bzero((char *)&frame, sizeof(frame));

		frame.mii_phyaddr = phy;
		frame.mii_regaddr = reg;
		al_mii_readreg(sc, &frame);

		return(frame.mii_data);
	}

	switch(reg) {
	case MII_BMCR:
		phy_reg = AL_BMCR;
		break;
	case MII_BMSR:
		phy_reg = AL_BMSR;
		break;
	case MII_PHYIDR1:
		phy_reg = AL_VENID;
		break;
	case MII_PHYIDR2:
		phy_reg = AL_DEVID;
		break;
	case MII_ANAR:
		phy_reg = AL_ANAR;
		break;
	case MII_ANLPAR:
		phy_reg = AL_LPAR;
		break;
	case MII_ANER:
		phy_reg = AL_ANER;
		break;
	default:
		printf("al%d: read: bad phy register %x\n",
		    sc->al_unit, reg);
		return(0);
		break;
	}

	rval = CSR_READ_4(sc, phy_reg) & 0x0000FFFF;

	if (rval == 0xFFFF)
		return(0);

	return(rval);
}

void al_miibus_writereg(self, phy, reg, data)
	struct device		*self;
	int			phy, reg, data;
{
	struct al_mii_frame	frame;
	struct al_softc		*sc = (struct al_softc *)self;
	u_int16_t		phy_reg = 0;

	if (phy != 1)
		return;

	if (sc->al_did == PCI_PRODUCT_ADMTEK_AN985) {
		bzero((char *)&frame, sizeof(frame));

		frame.mii_phyaddr = phy;
		frame.mii_regaddr = reg;
		frame.mii_data = data;

		al_mii_writereg(sc, &frame);
		return;
	}

	switch(reg) {
	case MII_BMCR:
		phy_reg = AL_BMCR;
		break;
	case MII_BMSR:
		phy_reg = AL_BMSR;
		break;
	case MII_PHYIDR1:
		phy_reg = AL_VENID;
		break;
	case MII_PHYIDR2:
		phy_reg = AL_DEVID;
		break;
	case MII_ANAR:
		phy_reg = AL_ANAR;
		break;
	case MII_ANLPAR:
		phy_reg = AL_LPAR;
		break;
	case MII_ANER:
		phy_reg = AL_ANER;
		break;
	default:
		printf("al%d: phy_write: bad phy register %x\n",
		    sc->al_unit, reg);
		return;
		break;
	}

	CSR_WRITE_4(sc, phy_reg, data);

	return;
}

void al_miibus_statchg(self)
	struct device		*self;
{
	return;
}

/*
 * Calculate CRC of a multicast group address, return the lower 6 bits.
 */
u_int32_t al_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 >> 26) & 0x0000003F);
}

void al_setmulti(sc)
	struct al_softc		*sc;
{
	struct ifnet		*ifp;
	int			h = 0;
	u_int32_t		hashes[2] = { 0, 0 };
	struct arpcom		*ac = &sc->arpcom;
	struct ether_multi	*enm;
	struct ether_multistep	step;
	u_int32_t		rxfilt;

	ifp = &sc->arpcom.ac_if;

	rxfilt = CSR_READ_4(sc, AL_NETCFG);

	if (ifp->if_flags & IFF_ALLMULTI || ifp->if_flags & IFF_PROMISC) {
		rxfilt |= AL_NETCFG_RX_ALLMULTI;
		CSR_WRITE_4(sc, AL_NETCFG, rxfilt);
		return;
	} else
		rxfilt &= ~AL_NETCFG_RX_ALLMULTI;

	/* first, zot all the existing hash bits */
	CSR_WRITE_4(sc, AL_MAR0, 0);
	CSR_WRITE_4(sc, AL_MAR1, 0);

	/* now program new ones */
	ETHER_FIRST_MULTI(step, ac, enm);
	while (enm != NULL) {
		h = al_calchash(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, AL_MAR0, hashes[0]);
	CSR_WRITE_4(sc, AL_MAR1, hashes[1]);
	CSR_WRITE_4(sc, AL_NETCFG, rxfilt);

	return;
}

void al_reset(sc)
	struct al_softc		*sc;
{
	register int		i;

	AL_SETBIT(sc, AL_BUSCTL, AL_BUSCTL_RESET);

	for (i = 0; i < AL_TIMEOUT; i++) {
		DELAY(10);
		if (!(CSR_READ_4(sc, AL_BUSCTL) & AL_BUSCTL_RESET))
			break;
	}
#ifdef notdef
	if (i == AL_TIMEOUT)
		printf("al%d: reset never completed!\n", sc->al_unit);
#endif
	CSR_WRITE_4(sc, AL_BUSCTL, AL_BUSCTL_ARBITRATION);

	/* Wait a little while for the chip to get its brains in order. */
	DELAY(1000);
        return;
}

/*
 * Probe for an ADMtek chip. Check the PCI vendor and device
 * IDs against our list and return a device name if we find a match.
 */
int al_probe(parent, match, aux)
	struct device		*parent;
	void			*match;
	void			*aux;
{
	struct pci_attach_args	*pa = (struct pci_attach_args *)aux;

	if (PCI_VENDOR(pa->pa_id) != PCI_VENDOR_ADMTEK)
		return (0);

	switch (PCI_PRODUCT(pa->pa_id)) {
	case PCI_PRODUCT_ADMTEK_AL981:
	case PCI_PRODUCT_ADMTEK_AN985:
		return (1);
	}

	return (0);
}

/*
 * Attach the interface. Allocate softc structures, do ifmedia
 * setup and ethernet/BPF attach.
 */
void
al_attach(parent, self, aux)
	struct device		*parent, *self;
	void			*aux;
{
	int			s, i;
#ifndef AL_USEIOSPACE
	vm_offset_t		pbase, vbase;
#endif
	const char		*intrstr = NULL;
	u_int32_t		command;
	struct al_softc		*sc = (struct al_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;
	unsigned int		round;
	caddr_t			roundptr;

	s = splimp();
	sc->al_unit = sc->sc_dev.dv_unit;
	sc->al_did = pa->pa_id;

	/*
	 * Handle power management nonsense.
	 */

	command = pci_conf_read(pc, pa->pa_tag, AL_PCI_CAPID) & 0x000000FF;
	if (command == 0x01) {

		command = pci_conf_read(pc, pa->pa_tag, AL_PCI_PWRMGMTCTRL);
		if (command & AL_PSTATE_MASK) {
			u_int32_t		iobase, membase, irq;

			/* Save important PCI config data. */
			iobase = pci_conf_read(pc, pa->pa_tag, AL_PCI_LOIO);
			membase = pci_conf_read(pc, pa->pa_tag, AL_PCI_LOMEM);
			irq = pci_conf_read(pc, pa->pa_tag, AL_PCI_INTLINE);

			/* Reset the power state. */
			printf("al%d: chip is in D%d power mode "
			"-- setting to D0\n", sc->al_unit, command & AL_PSTATE_MASK);
			command &= 0xFFFFFFFC;
			pci_conf_write(pc, pa->pa_tag, AL_PCI_PWRMGMTCTRL, command);

			/* Restore PCI config data. */
			pci_conf_write(pc, pa->pa_tag, AL_PCI_LOIO, iobase);
			pci_conf_write(pc, pa->pa_tag, AL_PCI_LOMEM, membase);
			pci_conf_write(pc, pa->pa_tag, AL_PCI_INTLINE, irq);
		}
	}

	/*
	 * 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 AL_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, AL_PCI_LOIO, &iobase, &iosize)) {
		printf(": can't find I/O space\n");
		goto fail;
	}
	if (bus_space_map(pa->pa_iot, iobase, iosize, 0, &sc->al_bhandle)) {
		printf(": can't map I/O space\n");
		goto fail;
	}
	sc->al_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, AL_PCI_LOMEM, &iobase, &iosize, NULL)){		printf(": can't find mem space\n");
		goto fail;
	}
	if (bus_space_map(pa->pa_memt, iobase, iosize, 0, &sc->al_bhandle)) {
		printf(": can't map mem space\n");
		goto fail;
	}
	sc->al_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, al_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);

	/* Save cache line size. */
	sc->al_cachesize = pci_conf_read(pc, pa->pa_tag, AL_PCI_CACHELEN)&0xFF;

	/* Reset the adapter. */
	al_reset(sc);

	/*
	 * Get station address from the EEPROM.
	 */
	al_read_eeprom(sc, (caddr_t)&sc->arpcom.ac_enaddr, AL_EE_NODEADDR,3,0);
	printf(" address %s\n", ether_sprintf(sc->arpcom.ac_enaddr));

	sc->al_ldata_ptr = malloc(sizeof(struct al_list_data) + 8,
				M_DEVBUF, M_NOWAIT);
	if (sc->al_ldata_ptr == NULL) {
		printf("%s: no memory for list buffers!\n", sc->al_unit);
		goto fail;
	}

	sc->al_ldata = (struct al_list_data *)sc->al_ldata_ptr;
	round = (unsigned long)sc->al_ldata_ptr & 0xF;
	roundptr = sc->al_ldata_ptr;
	for (i = 0; i < 8; i++) {
		if (round % 8) {
			round++;
			roundptr++;
		} else
			break;
	}
	sc->al_ldata = (struct al_list_data *)roundptr;
	bzero(sc->al_ldata, sizeof(struct al_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 = al_ioctl;
	ifp->if_output = ether_output;
	ifp->if_start = al_start;
	ifp->if_watchdog = al_watchdog;
	ifp->if_baudrate = 10000000;
	ifp->if_snd.ifq_maxlen = AL_TX_LIST_CNT - 1;
	bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);

	/*
	 * Initialize our media structures and probe the MII.
	 */
	sc->sc_mii.mii_ifp = ifp;
	sc->sc_mii.mii_readreg = al_miibus_readreg;
	sc->sc_mii.mii_writereg = al_miibus_writereg;
	sc->sc_mii.mii_statchg = al_miibus_statchg;
	ifmedia_init(&sc->sc_mii.mii_media, 0, al_ifmedia_upd, al_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);

	/*
	 * 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(al_shutdown, sc);

fail:
	splx(s);
	return;
}

/*
 * Initialize the transmit descriptors.
 */
int al_list_tx_init(sc)
	struct al_softc		*sc;
{
	struct al_chain_data	*cd;
	struct al_list_data	*ld;
	int			i;

	cd = &sc->al_cdata;
	ld = sc->al_ldata;
	for (i = 0; i < AL_TX_LIST_CNT; i++) {
		if (i == (AL_TX_LIST_CNT - 1)) {
			ld->al_tx_list[i].al_nextdesc =
			    &ld->al_tx_list[0];
			ld->al_tx_list[i].al_next =
			    vtophys(&ld->al_tx_list[0]);
		} else {
			ld->al_tx_list[i].al_nextdesc =
			    &ld->al_tx_list[i + 1];
			ld->al_tx_list[i].al_next =
			    vtophys(&ld->al_tx_list[i + 1]);
		}
		ld->al_tx_list[i].al_mbuf = NULL;
		ld->al_tx_list[i].al_data = 0;
		ld->al_tx_list[i].al_ctl = 0;
	}

	cd->al_tx_prod = cd->al_tx_cons = cd->al_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 al_list_rx_init(sc)
	struct al_softc		*sc;
{
	struct al_chain_data	*cd;
	struct al_list_data	*ld;
	int			i;

	cd = &sc->al_cdata;
	ld = sc->al_ldata;

	for (i = 0; i < AL_RX_LIST_CNT; i++) {
		if (al_newbuf(sc, &ld->al_rx_list[i], NULL) == ENOBUFS)
			return(ENOBUFS);
		if (i == (AL_RX_LIST_CNT - 1)) {
			ld->al_rx_list[i].al_nextdesc =
			    &ld->al_rx_list[0];
			ld->al_rx_list[i].al_next =
			    vtophys(&ld->al_rx_list[0]);
		} else {
			ld->al_rx_list[i].al_nextdesc =
			    &ld->al_rx_list[i + 1];
			ld->al_rx_list[i].al_next =
			    vtophys(&ld->al_rx_list[i + 1]);
		}
	}

	cd->al_rx_prod = 0;

	return(0);
}

/*
 * Initialize an RX descriptor and attach an MBUF cluster.
 */
int al_newbuf(sc, c, m)
	struct al_softc		*sc;
	struct al_desc		*c;
	struct mbuf		*m;
{
	struct mbuf		*m_new = NULL;

	if (m == NULL) {
		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
		if (m_new == NULL) {
			printf("al%d: no memory for rx list "
			    "-- packet dropped!\n", sc->al_unit);
			return(ENOBUFS);
		}

		MCLGET(m_new, M_DONTWAIT);
		if (!(m_new->m_flags & M_EXT)) {
			printf("al%d: no memory for rx list "
			    "-- packet dropped!\n", sc->al_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));

	c->al_mbuf = m_new;
	c->al_data = vtophys(mtod(m_new, caddr_t));
	c->al_ctl = AL_RXCTL_RLINK | AL_RXLEN;
	c->al_status = AL_RXSTAT_OWN;

	return(0);
}

/*
 * A frame has been uploaded: pass the resulting mbuf chain up to
 * the higher level protocols.
 */
void al_rxeof(sc)
	struct al_softc		*sc;
{
        struct ether_header	*eh;
        struct mbuf		*m;
        struct ifnet		*ifp;
	struct al_desc		*cur_rx;
	int			i, total_len = 0;
	u_int32_t		rxstat;

	ifp = &sc->arpcom.ac_if;

	i = sc->al_cdata.al_rx_prod;

	while(!(sc->al_ldata->al_rx_list[i].al_status & AL_RXSTAT_OWN)) {
		struct mbuf		*m0 = NULL;

		cur_rx = &sc->al_ldata->al_rx_list[i];
		rxstat = cur_rx->al_status;
		m = cur_rx->al_mbuf;
		cur_rx->al_mbuf = NULL;
		total_len = AL_RXBYTES(rxstat);
		AL_INC(i, AL_RX_LIST_CNT);

		/*
		 * 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 & AL_RXSTAT_RXERR) {
			ifp->if_ierrors++;
			if (rxstat & AL_RXSTAT_COLLSEEN)
				ifp->if_collisions++;
			al_newbuf(sc, cur_rx, m);
			al_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);
		al_newbuf(sc, cur_rx, m);
		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->al_cdata.al_rx_prod = i;

	return;
}

/*
 * A frame was downloaded to the chip. It's safe for us to clean up
 * the list buffers.
 */

void al_txeof(sc)
	struct al_softc		*sc;
{
	struct al_desc		*cur_tx = NULL;
	struct ifnet		*ifp;
	u_int32_t		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->al_cdata.al_tx_cons;
	while(idx != sc->al_cdata.al_tx_prod) {
		u_int32_t		txstat;

		cur_tx = &sc->al_ldata->al_tx_list[idx];
		txstat = cur_tx->al_status;

		if (txstat & AL_TXSTAT_OWN)
			break;

		if (!(cur_tx->al_ctl & AL_TXCTL_LASTFRAG)) {
			sc->al_cdata.al_tx_cnt--;
			AL_INC(idx, AL_TX_LIST_CNT);
			continue;
		}

		if (txstat & AL_TXSTAT_ERRSUM) {
			ifp->if_oerrors++;
			if (txstat & AL_TXSTAT_EXCESSCOLL)
				ifp->if_collisions++;
			if (txstat & AL_TXSTAT_LATECOLL)
				ifp->if_collisions++;
			al_init(sc);
			return;
		}

		ifp->if_collisions += (txstat & AL_TXSTAT_COLLCNT) >> 3;

		ifp->if_opackets++;
		if (cur_tx->al_mbuf != NULL) {
			m_freem(cur_tx->al_mbuf);
			cur_tx->al_mbuf = NULL;
		}

		sc->al_cdata.al_tx_cnt--;
		AL_INC(idx, AL_TX_LIST_CNT);
		ifp->if_timer = 0;
	}

	sc->al_cdata.al_tx_cons = idx;

	if (cur_tx != NULL)
		ifp->if_flags &= ~IFF_OACTIVE;

	return;
}

void al_tick(xsc)
	void			*xsc;
{
	struct al_softc		*sc;
	struct mii_data		*mii;
	int			s;

	s = splimp();

	sc = xsc;
	mii = &sc->sc_mii;
	mii_tick(mii);

	timeout(al_tick, sc, hz);

	splx(s);

	return;
};

int al_intr(arg)
	void			*arg;
{
	struct al_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)) {
		al_stop(sc);
		return (claimed);
	}

	/* Disable interrupts. */
	CSR_WRITE_4(sc, AL_IMR, 0x00000000);

	for (;;) {
		status = CSR_READ_4(sc, AL_ISR);
		if (status)
			CSR_WRITE_4(sc, AL_ISR, status);

		if ((status & AL_INTRS) == 0)
			break;

		claimed = 1;

		if ((status & AL_ISR_TX_OK) ||
		    (status & AL_ISR_TX_NOBUF))
			al_txeof(sc);

		if (status & AL_ISR_TX_IDLE) {
			al_txeof(sc);
			if (sc->al_cdata.al_tx_cnt) {
				AL_SETBIT(sc, AL_NETCFG, AL_NETCFG_TX_ON);
				CSR_WRITE_4(sc, AL_TXSTART, 0xFFFFFFFF);
			}
		}

		if (status & AL_ISR_TX_UNDERRUN) {
			u_int32_t		cfg;
			cfg = CSR_READ_4(sc, AL_NETCFG);
			if ((cfg & AL_NETCFG_TX_THRESH) == AL_TXTHRESH_160BYTES)
				AL_SETBIT(sc, AL_NETCFG, AL_NETCFG_STORENFWD);
			else
				CSR_WRITE_4(sc, AL_NETCFG, cfg + 0x4000);
		}

		if (status & AL_ISR_RX_OK)
			al_rxeof(sc);

		if ((status & AL_ISR_RX_WATDOGTIMEO) ||
		    (status & AL_ISR_RX_IDLE) ||
		    (status & AL_ISR_RX_NOBUF)) {
			al_rxeof(sc);
			al_init(sc);
		}

		if (status & AL_ISR_BUS_ERR) {
			al_reset(sc);
			al_init(sc);
		}
	}

	/* Re-enable interrupts. */
	CSR_WRITE_4(sc, AL_IMR, AL_INTRS);

	if (ifp->if_snd.ifq_head != NULL) {
		al_start(ifp);
	}

	return (claimed);
}

/*
 * Encapsulate an mbuf chain in a descriptor by coupling the mbuf data
 * pointers to the fragment pointers.
 */
int al_encap(sc, m_head, txidx)
	struct al_softc		*sc;
	struct mbuf		*m_head;
	u_int32_t		*txidx;
{
	struct al_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) {
#ifdef AL_TX_STALL_WAR
		/*
		 * Work around some strange behavior in the Comet. For
		 * some reason, the transmitter will sometimes wedge if
		 * we queue up a descriptor chain that wraps from the end
		 * of the transmit list back to the beginning. If we reach
		 * the end of the list and still have more packets to queue,
		 * don't queue them now: end the transmit session here and
		 * then wait until it finishes before sending the other
		 * packets.
		 */
			if (*txidx != sc->al_cdata.al_tx_prod &&
			    frag == (AL_TX_LIST_CNT - 1))
				return(ENOBUFS);
#endif
			if ((AL_TX_LIST_CNT -
			    (sc->al_cdata.al_tx_cnt + cnt)) < 2)
				return(ENOBUFS);
			f = &sc->al_ldata->al_tx_list[frag];
			f->al_ctl = AL_TXCTL_TLINK | m->m_len;
			if (cnt == 0) {
				f->al_status = 0;
				f->al_ctl |= AL_TXCTL_FIRSTFRAG;
			} else
				f->al_status = AL_TXSTAT_OWN;
			f->al_data = vtophys(mtod(m, vm_offset_t));
			cur = frag;
			AL_INC(frag, AL_TX_LIST_CNT);
			cnt++;
		}
	}

	if (m != NULL)
		return(ENOBUFS);

	sc->al_ldata->al_tx_list[cur].al_mbuf = m_head;
	sc->al_ldata->al_tx_list[cur].al_ctl |=
	    AL_TXCTL_LASTFRAG|AL_TXCTL_FINT;
	sc->al_ldata->al_tx_list[*txidx].al_status |= AL_TXSTAT_OWN;
	sc->al_cdata.al_tx_cnt += cnt;
	*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 al_start(ifp)
	struct ifnet		*ifp;
{
	struct al_softc		*sc;
	struct mbuf		*m_head = NULL;
	u_int32_t		idx;

	sc = ifp->if_softc;

	if (ifp->if_flags & IFF_OACTIVE)
		return;

	idx = sc->al_cdata.al_tx_prod;

	while(sc->al_ldata->al_tx_list[idx].al_mbuf == NULL) {
		IF_DEQUEUE(&ifp->if_snd, m_head);
		if (m_head == NULL)
			break;

		if (al_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->al_cdata.al_tx_prod = idx;
	CSR_WRITE_4(sc, AL_TXSTART, 0xFFFFFFFF);

	/*
	 * Set a timeout in case the chip goes out to lunch.
	 */
	ifp->if_timer = 5;

	return;
}

void al_init(xsc)
	void			*xsc;
{
	struct al_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.
	 */
	al_stop(sc);
	al_reset(sc);

	/*
	 * Set cache alignment and burst length.
	 */
	CSR_WRITE_4(sc, AL_BUSCTL, AL_BUSCTL_ARBITRATION);
	AL_SETBIT(sc, AL_BUSCTL, AL_BURSTLEN_16LONG);
	switch(sc->al_cachesize) {
	case 32:
		AL_SETBIT(sc, AL_BUSCTL, AL_CACHEALIGN_32LONG);
		break;
	case 16:
		AL_SETBIT(sc, AL_BUSCTL, AL_CACHEALIGN_16LONG);
		break;
	case 8:
		AL_SETBIT(sc, AL_BUSCTL, AL_CACHEALIGN_8LONG);
		break;
	case 0:
	default:
		AL_SETBIT(sc, AL_BUSCTL, AL_CACHEALIGN_NONE);
		break;
	}

	AL_CLRBIT(sc, AL_NETCFG, AL_NETCFG_HEARTBEAT);
	AL_CLRBIT(sc, AL_NETCFG, AL_NETCFG_STORENFWD);

	AL_CLRBIT(sc, AL_NETCFG, AL_NETCFG_TX_THRESH);

	if (IFM_SUBTYPE(sc->ifmedia.ifm_media) == IFM_10_T)
		AL_SETBIT(sc, AL_NETCFG, AL_TXTHRESH_160BYTES);
	else
		AL_SETBIT(sc, AL_NETCFG, AL_TXTHRESH_72BYTES);

	/* Init our MAC address */
	CSR_WRITE_4(sc, AL_PAR0, *(u_int32_t *)(&sc->arpcom.ac_enaddr[0]));
	CSR_WRITE_4(sc, AL_PAR1, *(u_int32_t *)(&sc->arpcom.ac_enaddr[4]));

	/* Init circular RX list. */
	if (al_list_rx_init(sc) == ENOBUFS) {
		printf("al%d: initialization failed: no "
			"memory for rx buffers\n", sc->al_unit);
		al_stop(sc);
		(void)splx(s);
		return;
	}

	/*
	 * Init tx descriptors.
	 */
	al_list_tx_init(sc);

	 /* If we want promiscuous mode, set the allframes bit. */
	if (ifp->if_flags & IFF_PROMISC) {
		AL_SETBIT(sc, AL_NETCFG, AL_NETCFG_RX_PROMISC);
	} else {
		AL_CLRBIT(sc, AL_NETCFG, AL_NETCFG_RX_PROMISC);
	}

	/*
	 * Load the multicast filter.
	 */
	al_setmulti(sc);

	/*
	 * Load the address of the RX list.
	 */
	CSR_WRITE_4(sc, AL_RXADDR, vtophys(&sc->al_ldata->al_rx_list[0]));
	CSR_WRITE_4(sc, AL_TXADDR, vtophys(&sc->al_ldata->al_tx_list[0]));

	/*
	 * Enable interrupts.
	 */
	CSR_WRITE_4(sc, AL_IMR, AL_INTRS);
	CSR_WRITE_4(sc, AL_ISR, 0xFFFFFFFF);

	/* Enable receiver and transmitter. */
	AL_SETBIT(sc, AL_NETCFG, AL_NETCFG_TX_ON|AL_NETCFG_RX_ON);
	CSR_WRITE_4(sc, AL_RXSTART, 0xFFFFFFFF);

	mii_mediachg(mii);

	ifp->if_flags |= IFF_RUNNING;
	ifp->if_flags &= ~IFF_OACTIVE;

	(void)splx(s);

	timeout(al_tick, sc, hz);

	return;
}

/*
 * Set media options.
 */
int al_ifmedia_upd(ifp)
	struct ifnet		*ifp;
{
	struct al_softc		*sc;

	sc = ifp->if_softc;

	if (ifp->if_flags & IFF_UP)
		al_init(sc);

	return(0);
}

/*
 * Report current media status.
 */
void al_ifmedia_sts(ifp, ifmr)
	struct ifnet		*ifp;
	struct ifmediareq	*ifmr;
{
	struct al_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 al_ioctl(ifp, command, data)
	struct ifnet		*ifp;
	u_long			command;
	caddr_t			data;
{
	struct al_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:
			al_init(sc);
			arp_ifinit(&sc->arpcom, ifa);
			break;	
		default:
			al_init(sc);
			break;
		}
		break;
	case SIOCSIFFLAGS:
		if (ifp->if_flags & IFF_UP) {
			al_init(sc);
		} else {
			if (ifp->if_flags & IFF_RUNNING)
				al_stop(sc);
		}
		error = 0;
		break;
	case SIOCADDMULTI:
	case SIOCDELMULTI:
		al_setmulti(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 al_watchdog(ifp)
	struct ifnet		*ifp;
{
	struct al_softc		*sc;

	sc = ifp->if_softc;

	ifp->if_oerrors++;
	printf("al%d: watchdog timeout\n", sc->al_unit);

	al_stop(sc);
	al_reset(sc);
	al_init(sc);

	if (ifp->if_snd.ifq_head != NULL)
		al_start(ifp);

	return;
}

/*
 * Stop the adapter and free any mbufs allocated to the
 * RX and TX lists.
 */
void al_stop(sc)
	struct al_softc		*sc;
{
	register int		i;
	struct ifnet		*ifp;

	ifp = &sc->arpcom.ac_if;
	ifp->if_timer = 0;

	untimeout(al_tick, sc);
	AL_CLRBIT(sc, AL_NETCFG, (AL_NETCFG_RX_ON|AL_NETCFG_TX_ON));
	CSR_WRITE_4(sc, AL_IMR, 0x00000000);
	CSR_WRITE_4(sc, AL_TXADDR, 0x00000000);
	CSR_WRITE_4(sc, AL_RXADDR, 0x00000000);

	/*
	 * Free data in the RX lists.
	 */
	for (i = 0; i < AL_RX_LIST_CNT; i++) {
		if (sc->al_ldata->al_rx_list[i].al_mbuf != NULL) {
			m_freem(sc->al_ldata->al_rx_list[i].al_mbuf);
			sc->al_ldata->al_rx_list[i].al_mbuf = NULL;
		}
	}
	bzero((char *)&sc->al_ldata->al_rx_list,
		sizeof(sc->al_ldata->al_rx_list));

	/*
	 * Free the TX list buffers.
	 */
	for (i = 0; i < AL_TX_LIST_CNT; i++) {
		if (sc->al_ldata->al_tx_list[i].al_mbuf != NULL) {
			m_freem(sc->al_ldata->al_tx_list[i].al_mbuf);
			sc->al_ldata->al_tx_list[i].al_mbuf = NULL;
		}
	}

	bzero((char *)&sc->al_ldata->al_tx_list,
		sizeof(sc->al_ldata->al_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 al_shutdown(v)
	void			*v;
{
	struct al_softc		*sc = (struct al_softc *)v;

	al_stop(sc);
}

struct cfattach al_ca = {
	sizeof(struct al_softc), al_probe, al_attach
};

struct cfdriver al_cd = {
	0, "al", DV_IFNET
};