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

/*	$OpenBSD: if_bge.c,v 1.151 2006/06/02 05:58:24 beck Exp $	*/

/*
 * Copyright (c) 2001 Wind River Systems
 * Copyright (c) 1997, 1998, 1999, 2001
 *	Bill Paul <wpaul@windriver.com>.  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: if_bge.c,v 1.25 2002/11/14 23:54:49 sam Exp $
 */

/*
 * Broadcom BCM570x family gigabit ethernet driver for FreeBSD.
 *
 * Written by Bill Paul <wpaul@windriver.com>
 * Senior Engineer, Wind River Systems
 */

/*
 * The Broadcom BCM5700 is based on technology originally developed by
 * Alteon Networks as part of the Tigon I and Tigon II gigabit ethernet
 * MAC chips. The BCM5700, sometimes refered to as the Tigon III, has
 * two on-board MIPS R4000 CPUs and can have as much as 16MB of external
 * SSRAM. The BCM5700 supports TCP, UDP and IP checksum offload, Jumbo
 * frames, highly configurable RX filtering, and 16 RX and TX queues
 * (which, along with RX filter rules, can be used for QOS applications).
 * Other features, such as TCP segmentation, may be available as part
 * of value-added firmware updates. Unlike the Tigon I and Tigon II,
 * firmware images can be stored in hardware and need not be compiled
 * into the driver.
 *
 * The BCM5700 supports the PCI v2.2 and PCI-X v1.0 standards, and will
 * function in a 32-bit/64-bit 33/66MHz bus, or a 64-bit/133MHz bus.
 *
 * The BCM5701 is a single-chip solution incorporating both the BCM5700
 * MAC and a BCM5401 10/100/1000 PHY. Unlike the BCM5700, the BCM5701
 * does not support external SSRAM.
 *
 * Broadcom also produces a variation of the BCM5700 under the "Altima"
 * brand name, which is functionally similar but lacks PCI-X support.
 *
 * Without external SSRAM, you can only have at most 4 TX rings,
 * and the use of the mini RX ring is disabled. This seems to imply
 * that these features are simply not available on the BCM5701. As a
 * result, this driver does not implement any support for the mini RX
 * ring.
 */

#include "bpfilter.h"
#include "vlan.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/device.h>
#include <sys/socket.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>

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

#if NVLAN > 0
#include <net/if_types.h>
#include <net/if_vlan_var.h>
#endif

#if NBPFILTER > 0
#include <net/bpf.h>
#endif

#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <dev/pci/pcidevs.h>

#include <dev/mii/mii.h>
#include <dev/mii/miivar.h>
#include <dev/mii/miidevs.h>
#include <dev/mii/brgphyreg.h>

#include <dev/pci/if_bgereg.h>

const struct bge_revision * bge_lookup_rev(u_int32_t);
int bge_probe(struct device *, void *, void *);
void bge_attach(struct device *, struct device *, void *);

struct cfattach bge_ca = {
	sizeof(struct bge_softc), bge_probe, bge_attach
};

struct cfdriver bge_cd = {
	0, "bge", DV_IFNET
};

void bge_txeof(struct bge_softc *);
void bge_rxeof(struct bge_softc *);

void bge_tick(void *);
void bge_stats_update(struct bge_softc *);
void bge_stats_update_regs(struct bge_softc *);
int bge_encap(struct bge_softc *, struct mbuf *, u_int32_t *);
int bge_compact_dma_runt(struct mbuf *pkt);

int bge_intr(void *);
void bge_start(struct ifnet *);
int bge_ioctl(struct ifnet *, u_long, caddr_t);
void bge_init(void *);
void bge_power(int, void *);
void bge_stop_block(struct bge_softc *, bus_size_t, u_int32_t);
void bge_stop(struct bge_softc *);
void bge_watchdog(struct ifnet *);
void bge_shutdown(void *);
int bge_ifmedia_upd(struct ifnet *);
void bge_ifmedia_sts(struct ifnet *, struct ifmediareq *);

u_int8_t bge_eeprom_getbyte(struct bge_softc *, int, u_int8_t *);
int bge_read_eeprom(struct bge_softc *, caddr_t, int, int);

void bge_setmulti(struct bge_softc *);

int bge_alloc_jumbo_mem(struct bge_softc *);
void *bge_jalloc(struct bge_softc *);
void bge_jfree(caddr_t, u_int, void *);
int bge_newbuf_std(struct bge_softc *, int, struct mbuf *, bus_dmamap_t);
int bge_newbuf_jumbo(struct bge_softc *, int, struct mbuf *);
int bge_init_rx_ring_std(struct bge_softc *);
void bge_free_rx_ring_std(struct bge_softc *);
int bge_init_rx_ring_jumbo(struct bge_softc *);
void bge_free_rx_ring_jumbo(struct bge_softc *);
void bge_free_tx_ring(struct bge_softc *);
int bge_init_tx_ring(struct bge_softc *);

int bge_chipinit(struct bge_softc *);
int bge_blockinit(struct bge_softc *);

u_int32_t bge_readmem_ind(struct bge_softc *, int);
void bge_writemem_ind(struct bge_softc *, int, int);
void bge_writereg_ind(struct bge_softc *, int, int);

int bge_miibus_readreg(struct device *, int, int);
void bge_miibus_writereg(struct device *, int, int, int);
void bge_miibus_statchg(struct device *);

void bge_reset(struct bge_softc *);
void bge_link_upd(struct bge_softc *);

#define BGE_DEBUG
#ifdef BGE_DEBUG
#define DPRINTF(x)	if (bgedebug) printf x
#define DPRINTFN(n,x)	if (bgedebug >= (n)) printf x
int	bgedebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

/*
 * Various supported device vendors/types and their names. Note: the
 * spec seems to indicate that the hardware still has Alteon's vendor
 * ID burned into it, though it will always be overridden by the vendor
 * ID in the EEPROM. Just to be safe, we cover all possibilities.
 */
const struct pci_matchid bge_devices[] = {
	{ PCI_VENDOR_ALTEON, PCI_PRODUCT_ALTEON_BCM5700 },
	{ PCI_VENDOR_ALTEON, PCI_PRODUCT_ALTEON_BCM5701 },

	{ PCI_VENDOR_ALTIMA, PCI_PRODUCT_ALTIMA_AC1000 },
	{ PCI_VENDOR_ALTIMA, PCI_PRODUCT_ALTIMA_AC1001 },
	{ PCI_VENDOR_ALTIMA, PCI_PRODUCT_ALTIMA_AC9100 },

	{ PCI_VENDOR_APPLE, PCI_PRODUCT_APPLE_BCM5701 },

	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5700 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5701 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5702 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5702_ALT },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5702X },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5703 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5703_ALT },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5703X },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5704C },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5704S },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5704S_ALT },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5705 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5705F },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5705K },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5705M },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5705M_ALT },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5714 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5714S },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5715 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5715S },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5720 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5721 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5750 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5750M },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5751 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5751F },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5751M },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5752 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5752M },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5753 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5753F },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5753M },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5780 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5780S },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5781 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5782 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5788 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5789 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5901 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5901A2 },
	{ PCI_VENDOR_BROADCOM, PCI_PRODUCT_BROADCOM_BCM5903M },

	{ PCI_VENDOR_SCHNEIDERKOCH, PCI_PRODUCT_SCHNEIDERKOCH_SK9D21 },

	{ PCI_VENDOR_3COM, PCI_PRODUCT_3COM_3C996 },
};

#define BGE_IS_5705_OR_BEYOND(sc)  \
	(BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5705    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5750    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5714_A0 || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5780    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5714    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5752)

#define BGE_IS_575X_PLUS(sc)  \
	(BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5750    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5714_A0 || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5780    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5714    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5752)

#define BGE_IS_5714_FAMILY(sc)  \
	(BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5714_A0 || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5780    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5714)

#define BGE_IS_JUMBO_CAPABLE(sc)  \
	(BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5700    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5701    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5703    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5714_A0 || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5780    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5714    || \
	 BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5704)


static const struct bge_revision {
	u_int32_t		br_chipid;
	const char		*br_name;
} bge_revisions[] = {
	{ BGE_CHIPID_BCM5700_A0,
	  "BCM5700 A0" },

	{ BGE_CHIPID_BCM5700_A1,
	  "BCM5700 A1" },

	{ BGE_CHIPID_BCM5700_B0,
	  "BCM5700 B0" },

	{ BGE_CHIPID_BCM5700_B1,
	  "BCM5700 B1" },

	{ BGE_CHIPID_BCM5700_B2,
	  "BCM5700 B2" },

	{ BGE_CHIPID_BCM5700_B3,
	  "BCM5700 B3" },

	/* This is treated like a BCM5700 Bx */
	{ BGE_CHIPID_BCM5700_ALTIMA,
	  "BCM5700 Altima" },

	{ BGE_CHIPID_BCM5700_C0,
	  "BCM5700 C0" },

	{ BGE_CHIPID_BCM5701_A0,
	  "BCM5701 A0" },

	{ BGE_CHIPID_BCM5701_B0,
	  "BCM5701 B0" },

	{ BGE_CHIPID_BCM5701_B2,
	  "BCM5701 B2" },

	{ BGE_CHIPID_BCM5701_B5,
	  "BCM5701 B5" },

	{ BGE_CHIPID_BCM5703_A0,
	  "BCM5703 A0" },

	{ BGE_CHIPID_BCM5703_A1,
	  "BCM5703 A1" },

	{ BGE_CHIPID_BCM5703_A2,
	  "BCM5703 A2" },

	{ BGE_CHIPID_BCM5703_A3,
	  "BCM5703 A3" },

	{ BGE_CHIPID_BCM5704_A0,
	  "BCM5704 A0" },

	{ BGE_CHIPID_BCM5704_A1,
	  "BCM5704 A1" },

	{ BGE_CHIPID_BCM5704_A2,
	  "BCM5704 A2" },

	{ BGE_CHIPID_BCM5704_A3,
	  "BCM5704 A3" },

	{ BGE_CHIPID_BCM5704_B0,
	  "BCM5704 B0" },

	{ BGE_CHIPID_BCM5705_A0,
	  "BCM5705 A0" },

	{ BGE_CHIPID_BCM5705_A1,
	  "BCM5705 A1" },

	{ BGE_CHIPID_BCM5705_A2,
	  "BCM5705 A2" },

	{ BGE_CHIPID_BCM5705_A3,
	  "BCM5705 A3" },

	{ BGE_CHIPID_BCM5750_A0,
	  "BCM5750 A0" },

	{ BGE_CHIPID_BCM5750_A1,
	  "BCM5750 A1" },

	{ BGE_CHIPID_BCM5750_A3,
	  "BCM5750 A3" },

	{ BGE_CHIPID_BCM5750_B0,
	  "BCM5750 B0" },

	{ BGE_CHIPID_BCM5750_B1,
	  "BCM5750 B1" },

	{ BGE_CHIPID_BCM5750_C0,
	  "BCM5750 C0" },

	{ BGE_CHIPID_BCM5750_C1,
	  "BCM5750 C1" },

	{ BGE_CHIPID_BCM5714_A0,
	  "BCM5714 A0" },

	{ BGE_CHIPID_BCM5752_A0,
	  "BCM5752 A0" },

	{ BGE_CHIPID_BCM5752_A1,
	  "BCM5752 A1" },

	{ BGE_CHIPID_BCM5752_A2,
	  "BCM5752 A2" },

	{ BGE_CHIPID_BCM5714_B0,
	  "BCM5714 B0" },

	{ BGE_CHIPID_BCM5714_B3,
	  "BCM5714 B3" },

	{ BGE_CHIPID_BCM5715_A0,
	  "BCM5715 A0" },

	{ BGE_CHIPID_BCM5715_A1,
	  "BCM5715 A1" },

	{ 0,
	  NULL }
};

/*
 * Some defaults for major revisions, so that newer steppings
 * that we don't know about have a shot at working.
 */
static const struct bge_revision bge_majorrevs[] = {
	{ BGE_ASICREV_BCM5700,
	  "unknown BCM5700" },

	{ BGE_ASICREV_BCM5701,
	  "unknown BCM5701" },

	{ BGE_ASICREV_BCM5703,
	  "unknown BCM5703" },

	{ BGE_ASICREV_BCM5704,
	  "unknown BCM5704" },

	{ BGE_ASICREV_BCM5705,
	  "unknown BCM5705" },

	{ BGE_ASICREV_BCM5750,
	  "unknown BCM5750" },

	{ BGE_ASICREV_BCM5714_A0,
	  "unknown BCM5714" },

	{ BGE_ASICREV_BCM5752,
	  "unknown BCM5752" },

	{ BGE_ASICREV_BCM5780,
	  "unknown BCM5780" },

	{ BGE_ASICREV_BCM5714,
	  "unknown BCM5714" },

	{ 0,
	  NULL }
};

u_int32_t
bge_readmem_ind(struct bge_softc *sc, int off)
{
	struct pci_attach_args	*pa = &(sc->bge_pa);

	pci_conf_write(pa->pa_pc, pa->pa_tag, BGE_PCI_MEMWIN_BASEADDR, off);
	return (pci_conf_read(pa->pa_pc, pa->pa_tag, BGE_PCI_MEMWIN_DATA));
}

void
bge_writemem_ind(struct bge_softc *sc, int off, int val)
{
	struct pci_attach_args	*pa = &(sc->bge_pa);

	pci_conf_write(pa->pa_pc, pa->pa_tag, BGE_PCI_MEMWIN_BASEADDR, off);
	pci_conf_write(pa->pa_pc, pa->pa_tag, BGE_PCI_MEMWIN_DATA, val);
}

void
bge_writereg_ind(struct bge_softc *sc, int off, int val)
{
	struct pci_attach_args	*pa = &(sc->bge_pa);

	pci_conf_write(pa->pa_pc, pa->pa_tag, BGE_PCI_REG_BASEADDR, off);
	pci_conf_write(pa->pa_pc, pa->pa_tag, BGE_PCI_REG_DATA, val);
}

/*
 * Read a byte of data stored in the EEPROM at address 'addr.' The
 * BCM570x supports both the traditional bitbang interface and an
 * auto access interface for reading the EEPROM. We use the auto
 * access method.
 */
u_int8_t
bge_eeprom_getbyte(struct bge_softc *sc, int addr, u_int8_t *dest)
{
	int i;
	u_int32_t byte = 0;

	/*
	 * Enable use of auto EEPROM access so we can avoid
	 * having to use the bitbang method.
	 */
	BGE_SETBIT(sc, BGE_MISC_LOCAL_CTL, BGE_MLC_AUTO_EEPROM);

	/* Reset the EEPROM, load the clock period. */
	CSR_WRITE_4(sc, BGE_EE_ADDR,
	    BGE_EEADDR_RESET|BGE_EEHALFCLK(BGE_HALFCLK_384SCL));
	DELAY(20);

	/* Issue the read EEPROM command. */
	CSR_WRITE_4(sc, BGE_EE_ADDR, BGE_EE_READCMD | addr);

	/* Wait for completion */
	for(i = 0; i < BGE_TIMEOUT * 10; i++) {
		DELAY(10);
		if (CSR_READ_4(sc, BGE_EE_ADDR) & BGE_EEADDR_DONE)
			break;
	}

	if (i == BGE_TIMEOUT * 10) {
		printf("%s: eeprom read timed out\n", sc->bge_dev.dv_xname);
		return (1);
	}

	/* Get result. */
	byte = CSR_READ_4(sc, BGE_EE_DATA);

	*dest = (byte >> ((addr % 4) * 8)) & 0xFF;

	return (0);
}

/*
 * Read a sequence of bytes from the EEPROM.
 */
int
bge_read_eeprom(struct bge_softc *sc, caddr_t dest, int off, int cnt)
{
	int err = 0, i;
	u_int8_t byte = 0;

	for (i = 0; i < cnt; i++) {
		err = bge_eeprom_getbyte(sc, off + i, &byte);
		if (err)
			break;
		*(dest + i) = byte;
	}

	return (err ? 1 : 0);
}

int
bge_miibus_readreg(struct device *dev, int phy, int reg)
{
	struct bge_softc *sc = (struct bge_softc *)dev;
	u_int32_t val, autopoll;
	int i;

	/*
	 * Broadcom's own driver always assumes the internal
	 * PHY is at GMII address 1. On some chips, the PHY responds
	 * to accesses at all addresses, which could cause us to
	 * bogusly attach the PHY 32 times at probe type. Always
	 * restricting the lookup to address 1 is simpler than
	 * trying to figure out which chips revisions should be
	 * special-cased.
	 */
	if (phy != 1)
		return (0);

	/* Reading with autopolling on may trigger PCI errors */
	autopoll = CSR_READ_4(sc, BGE_MI_MODE);
	if (autopoll & BGE_MIMODE_AUTOPOLL) {
		BGE_CLRBIT(sc, BGE_MI_MODE, BGE_MIMODE_AUTOPOLL);
		DELAY(40);
	}

	CSR_WRITE_4(sc, BGE_MI_COMM, BGE_MICMD_READ|BGE_MICOMM_BUSY|
	    BGE_MIPHY(phy)|BGE_MIREG(reg));

	for (i = 0; i < 200; i++) {
		delay(1);
		val = CSR_READ_4(sc, BGE_MI_COMM);
		if (!(val & BGE_MICOMM_BUSY))
			break;
		delay(10);
	}

	if (i == 200) {
		printf("%s: PHY read timed out\n", sc->bge_dev.dv_xname);
		val = 0;
		goto done;
	}

	val = CSR_READ_4(sc, BGE_MI_COMM);

done:
	if (autopoll & BGE_MIMODE_AUTOPOLL) {
		BGE_SETBIT(sc, BGE_MI_MODE, BGE_MIMODE_AUTOPOLL);
		DELAY(40);
	}

	if (val & BGE_MICOMM_READFAIL)
		return (0);

	return (val & 0xFFFF);
}

void
bge_miibus_writereg(struct device *dev, int phy, int reg, int val)
{
	struct bge_softc *sc = (struct bge_softc *)dev;
	u_int32_t autopoll;
	int i;

	/* Reading with autopolling on may trigger PCI errors */
	autopoll = CSR_READ_4(sc, BGE_MI_MODE);
	if (autopoll & BGE_MIMODE_AUTOPOLL) {
		DELAY(40);
		BGE_CLRBIT(sc, BGE_MI_MODE, BGE_MIMODE_AUTOPOLL);
		DELAY(10); /* 40 usec is supposed to be adequate */
	}

	CSR_WRITE_4(sc, BGE_MI_COMM, BGE_MICMD_WRITE|BGE_MICOMM_BUSY|
	    BGE_MIPHY(phy)|BGE_MIREG(reg)|val);

	for (i = 0; i < 200; i++) {
		delay(1);
		if (!(CSR_READ_4(sc, BGE_MI_COMM) & BGE_MICOMM_BUSY))
			break;
		delay(10);
	}

	if (autopoll & BGE_MIMODE_AUTOPOLL) {
		BGE_SETBIT(sc, BGE_MI_MODE, BGE_MIMODE_AUTOPOLL);
		DELAY(40);
	}

	if (i == 200) {
		printf("%s: PHY read timed out\n", sc->bge_dev.dv_xname);
	}
}

void
bge_miibus_statchg(struct device *dev)
{
	struct bge_softc *sc = (struct bge_softc *)dev;
	struct mii_data *mii = &sc->bge_mii;

	BGE_CLRBIT(sc, BGE_MAC_MODE, BGE_MACMODE_PORTMODE);
	if (IFM_SUBTYPE(mii->mii_media_active) == IFM_1000_T)
		BGE_SETBIT(sc, BGE_MAC_MODE, BGE_PORTMODE_GMII);
	else
		BGE_SETBIT(sc, BGE_MAC_MODE, BGE_PORTMODE_MII);

	if ((mii->mii_media_active & IFM_GMASK) == IFM_FDX)
		BGE_CLRBIT(sc, BGE_MAC_MODE, BGE_MACMODE_HALF_DUPLEX);
	else
		BGE_SETBIT(sc, BGE_MAC_MODE, BGE_MACMODE_HALF_DUPLEX);
}

/*
 * Memory management for Jumbo frames.
 */

int
bge_alloc_jumbo_mem(struct bge_softc *sc)
{
	caddr_t			ptr, kva;
	bus_dma_segment_t	seg;
	int		i, rseg, state, error;
	struct bge_jpool_entry   *entry;

	state = error = 0;

	/* Grab a big chunk o' storage. */
	if (bus_dmamem_alloc(sc->bge_dmatag, BGE_JMEM, PAGE_SIZE, 0,
			     &seg, 1, &rseg, BUS_DMA_NOWAIT)) {
		printf("%s: can't alloc rx buffers\n", sc->bge_dev.dv_xname);
		return (ENOBUFS);
	}

	state = 1;
	if (bus_dmamem_map(sc->bge_dmatag, &seg, rseg, BGE_JMEM, &kva,
			   BUS_DMA_NOWAIT)) {
		printf("%s: can't map dma buffers (%d bytes)\n",
		    sc->bge_dev.dv_xname, BGE_JMEM);
		error = ENOBUFS;
		goto out;
	}

	state = 2;
	if (bus_dmamap_create(sc->bge_dmatag, BGE_JMEM, 1, BGE_JMEM, 0,
	    BUS_DMA_NOWAIT, &sc->bge_cdata.bge_rx_jumbo_map)) {
		printf("%s: can't create dma map\n", sc->bge_dev.dv_xname);
		error = ENOBUFS;
		goto out;
	}

	state = 3;
	if (bus_dmamap_load(sc->bge_dmatag, sc->bge_cdata.bge_rx_jumbo_map,
			    kva, BGE_JMEM, NULL, BUS_DMA_NOWAIT)) {
		printf("%s: can't load dma map\n", sc->bge_dev.dv_xname);
		error = ENOBUFS;
		goto out;
	}

	state = 4;
	sc->bge_cdata.bge_jumbo_buf = (caddr_t)kva;
	DPRINTFN(1,("bge_jumbo_buf = 0x%08X\n", sc->bge_cdata.bge_jumbo_buf));

	SLIST_INIT(&sc->bge_jfree_listhead);
	SLIST_INIT(&sc->bge_jinuse_listhead);

	/*
	 * Now divide it up into 9K pieces and save the addresses
	 * in an array.
	 */
	ptr = sc->bge_cdata.bge_jumbo_buf;
	for (i = 0; i < BGE_JSLOTS; i++) {
		sc->bge_cdata.bge_jslots[i] = ptr;
		ptr += BGE_JLEN;
		entry = malloc(sizeof(struct bge_jpool_entry),
		    M_DEVBUF, M_NOWAIT);
		if (entry == NULL) {
			printf("%s: no memory for jumbo buffer queue!\n",
			    sc->bge_dev.dv_xname);
			error = ENOBUFS;
			goto out;
		}
		entry->slot = i;
		SLIST_INSERT_HEAD(&sc->bge_jfree_listhead,
				 entry, jpool_entries);
	}
out:
	if (error != 0) {
		switch (state) {
		case 4:
			bus_dmamap_unload(sc->bge_dmatag,
			    sc->bge_cdata.bge_rx_jumbo_map);
		case 3:
			bus_dmamap_destroy(sc->bge_dmatag,
			    sc->bge_cdata.bge_rx_jumbo_map);
		case 2:
			bus_dmamem_unmap(sc->bge_dmatag, kva, BGE_JMEM);
		case 1:
			bus_dmamem_free(sc->bge_dmatag, &seg, rseg);
			break;
		default:
			break;
		}
	}

	return (error);
}

/*
 * Allocate a Jumbo buffer.
 */
void *
bge_jalloc(struct bge_softc *sc)
{
	struct bge_jpool_entry   *entry;

	entry = SLIST_FIRST(&sc->bge_jfree_listhead);

	if (entry == NULL)
		return (NULL);

	SLIST_REMOVE_HEAD(&sc->bge_jfree_listhead, jpool_entries);
	SLIST_INSERT_HEAD(&sc->bge_jinuse_listhead, entry, jpool_entries);
	return (sc->bge_cdata.bge_jslots[entry->slot]);
}

/*
 * Release a Jumbo buffer.
 */
void
bge_jfree(caddr_t buf, u_int size, void *arg)
{
	struct bge_jpool_entry *entry;
	struct bge_softc *sc;
	int i;

	/* Extract the softc struct pointer. */
	sc = (struct bge_softc *)arg;

	if (sc == NULL)
		panic("bge_jfree: can't find softc pointer!");

	/* calculate the slot this buffer belongs to */

	i = ((vaddr_t)buf
	     - (vaddr_t)sc->bge_cdata.bge_jumbo_buf) / BGE_JLEN;

	if ((i < 0) || (i >= BGE_JSLOTS))
		panic("bge_jfree: asked to free buffer that we don't manage!");

	entry = SLIST_FIRST(&sc->bge_jinuse_listhead);
	if (entry == NULL)
		panic("bge_jfree: buffer not in use!");
	entry->slot = i;
	SLIST_REMOVE_HEAD(&sc->bge_jinuse_listhead, jpool_entries);
	SLIST_INSERT_HEAD(&sc->bge_jfree_listhead, entry, jpool_entries);
}


/*
 * Intialize a standard receive ring descriptor.
 */
int
bge_newbuf_std(struct bge_softc *sc, int i, struct mbuf *m,
    bus_dmamap_t dmamap)
{
	struct mbuf		*m_new = NULL;
	struct bge_rx_bd	*r;
	int			error;

	if (dmamap == NULL) {
		error = bus_dmamap_create(sc->bge_dmatag, MCLBYTES, 1,
		    MCLBYTES, 0, BUS_DMA_NOWAIT, &dmamap);
		if (error != 0)
			return (error);
	}

	sc->bge_cdata.bge_rx_std_map[i] = dmamap;

	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 {
		/*
		 * We're re-using a previously allocated mbuf;
		 * be sure to re-init pointers and lengths to
		 * default values.
		 */
		m_new = m;
		m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
		m_new->m_data = m_new->m_ext.ext_buf;
	}

	if (!sc->bge_rx_alignment_bug)
	    m_adj(m_new, ETHER_ALIGN);

	error = bus_dmamap_load_mbuf(sc->bge_dmatag, dmamap, m_new,
	    BUS_DMA_READ|BUS_DMA_NOWAIT);
	if (error) {
		if (m == NULL) {
			m_freem(m_new);
			sc->bge_cdata.bge_rx_std_chain[i] = NULL;
		}
		return (ENOMEM);

	}

	sc->bge_cdata.bge_rx_std_chain[i] = m_new;
	r = &sc->bge_rdata->bge_rx_std_ring[i];
	BGE_HOSTADDR(r->bge_addr, dmamap->dm_segs[0].ds_addr);
	r->bge_flags = BGE_RXBDFLAG_END;
	r->bge_len = m_new->m_len;
	r->bge_idx = i;

	bus_dmamap_sync(sc->bge_dmatag, sc->bge_ring_map,
	    offsetof(struct bge_ring_data, bge_rx_std_ring) +
		i * sizeof (struct bge_rx_bd),
	    sizeof (struct bge_rx_bd),
	    BUS_DMASYNC_PREWRITE|BUS_DMASYNC_PREREAD);

	return (0);
}

/*
 * Initialize a Jumbo receive ring descriptor. This allocates
 * a Jumbo buffer from the pool managed internally by the driver.
 */
int
bge_newbuf_jumbo(struct bge_softc *sc, int i, struct mbuf *m)
{
	struct mbuf *m_new = NULL;
	struct bge_rx_bd *r;

	if (m == NULL) {
		caddr_t			buf = NULL;

		/* Allocate the mbuf. */
		MGETHDR(m_new, M_DONTWAIT, MT_DATA);
		if (m_new == NULL)
			return (ENOBUFS);

		/* Allocate the Jumbo buffer */
		buf = bge_jalloc(sc);
		if (buf == NULL) {
			m_freem(m_new);
			return (ENOBUFS);
		}

		/* Attach the buffer to the mbuf. */
		m_new->m_len = m_new->m_pkthdr.len = BGE_JUMBO_FRAMELEN;
		MEXTADD(m_new, buf, BGE_JUMBO_FRAMELEN, 0, bge_jfree, sc);
	} else {
		/*
		 * We're re-using a previously allocated mbuf;
		 * be sure to re-init pointers and lengths to
		 * default values.
		 */
		m_new = m;
		m_new->m_data = m_new->m_ext.ext_buf;
		m_new->m_ext.ext_size = BGE_JUMBO_FRAMELEN;
	}

	if (!sc->bge_rx_alignment_bug)
		m_adj(m_new, ETHER_ALIGN);
	/* Set up the descriptor. */
	r = &sc->bge_rdata->bge_rx_jumbo_ring[i];
	sc->bge_cdata.bge_rx_jumbo_chain[i] = m_new;
	BGE_HOSTADDR(r->bge_addr, BGE_JUMBO_DMA_ADDR(sc, m_new));
	r->bge_flags = BGE_RXBDFLAG_END|BGE_RXBDFLAG_JUMBO_RING;
	r->bge_len = m_new->m_len;
	r->bge_idx = i;

	bus_dmamap_sync(sc->bge_dmatag, sc->bge_ring_map,
	    offsetof(struct bge_ring_data, bge_rx_jumbo_ring) +
		i * sizeof (struct bge_rx_bd),
	    sizeof (struct bge_rx_bd),
	    BUS_DMASYNC_PREWRITE|BUS_DMASYNC_PREREAD);

	return (0);
}

/*
 * The standard receive ring has 512 entries in it. At 2K per mbuf cluster,
 * that's 1MB or memory, which is a lot. For now, we fill only the first
 * 256 ring entries and hope that our CPU is fast enough to keep up with
 * the NIC.
 */
int
bge_init_rx_ring_std(struct bge_softc *sc)
{
	int i;

	if (sc->bge_flags & BGE_RXRING_VALID)
		return (0);

	for (i = 0; i < BGE_SSLOTS; i++) {
		if (bge_newbuf_std(sc, i, NULL, 0) == ENOBUFS)
			return (ENOBUFS);
	}

	sc->bge_std = i - 1;
	CSR_WRITE_4(sc, BGE_MBX_RX_STD_PROD_LO, sc->bge_std);

	sc->bge_flags |= BGE_RXRING_VALID;

	return (0);
}

void
bge_free_rx_ring_std(struct bge_softc *sc)
{
	int i;

	if (!(sc->bge_flags & BGE_RXRING_VALID))
		return;

	for (i = 0; i < BGE_STD_RX_RING_CNT; i++) {
		if (sc->bge_cdata.bge_rx_std_chain[i] != NULL) {
			m_freem(sc->bge_cdata.bge_rx_std_chain[i]);
			sc->bge_cdata.bge_rx_std_chain[i] = NULL;
			bus_dmamap_destroy(sc->bge_dmatag,
			    sc->bge_cdata.bge_rx_std_map[i]);
		}
		bzero((char *)&sc->bge_rdata->bge_rx_std_ring[i],
		    sizeof(struct bge_rx_bd));
	}

	sc->bge_flags &= ~BGE_RXRING_VALID;
}

int
bge_init_rx_ring_jumbo(struct bge_softc *sc)
{
	int i;
	volatile struct bge_rcb *rcb;

	if (sc->bge_flags & BGE_JUMBO_RXRING_VALID)
		return (0);

	for (i = 0; i < BGE_JUMBO_RX_RING_CNT; i++) {
		if (bge_newbuf_jumbo(sc, i, NULL) == ENOBUFS)
			return (ENOBUFS);
	};

	sc->bge_jumbo = i - 1;
	sc->bge_flags |= BGE_JUMBO_RXRING_VALID;

	rcb = &sc->bge_rdata->bge_info.bge_jumbo_rx_rcb;
	rcb->bge_maxlen_flags = BGE_RCB_MAXLEN_FLAGS(0, 0);
	CSR_WRITE_4(sc, BGE_RX_JUMBO_RCB_MAXLEN_FLAGS, rcb->bge_maxlen_flags);

	CSR_WRITE_4(sc, BGE_MBX_RX_JUMBO_PROD_LO, sc->bge_jumbo);

	return (0);
}

void
bge_free_rx_ring_jumbo(struct bge_softc *sc)
{
	int i;

	if (!(sc->bge_flags & BGE_JUMBO_RXRING_VALID))
		return;

	for (i = 0; i < BGE_JUMBO_RX_RING_CNT; i++) {
		if (sc->bge_cdata.bge_rx_jumbo_chain[i] != NULL) {
			m_freem(sc->bge_cdata.bge_rx_jumbo_chain[i]);
			sc->bge_cdata.bge_rx_jumbo_chain[i] = NULL;
		}
		bzero((char *)&sc->bge_rdata->bge_rx_jumbo_ring[i],
		    sizeof(struct bge_rx_bd));
	}

	sc->bge_flags &= ~BGE_JUMBO_RXRING_VALID;
}

void
bge_free_tx_ring(struct bge_softc *sc)
{
	int i;
	struct txdmamap_pool_entry *dma;

	if (!(sc->bge_flags & BGE_TXRING_VALID))
		return;

	for (i = 0; i < BGE_TX_RING_CNT; i++) {
		if (sc->bge_cdata.bge_tx_chain[i] != NULL) {
			m_freem(sc->bge_cdata.bge_tx_chain[i]);
			sc->bge_cdata.bge_tx_chain[i] = NULL;
			SLIST_INSERT_HEAD(&sc->txdma_list, sc->txdma[i],
					    link);
			sc->txdma[i] = 0;
		}
		bzero((char *)&sc->bge_rdata->bge_tx_ring[i],
		    sizeof(struct bge_tx_bd));
	}

	while ((dma = SLIST_FIRST(&sc->txdma_list))) {
		SLIST_REMOVE_HEAD(&sc->txdma_list, link);
		bus_dmamap_destroy(sc->bge_dmatag, dma->dmamap);
		free(dma, M_DEVBUF);
	}

	sc->bge_flags &= ~BGE_TXRING_VALID;
}

int
bge_init_tx_ring(struct bge_softc *sc)
{
	int i;
	bus_dmamap_t dmamap;
	struct txdmamap_pool_entry *dma;

	if (sc->bge_flags & BGE_TXRING_VALID)
		return (0);

	sc->bge_txcnt = 0;
	sc->bge_tx_saved_considx = 0;

	/* Initialize transmit producer index for host-memory send ring. */
	sc->bge_tx_prodidx = 0;
	CSR_WRITE_4(sc, BGE_MBX_TX_HOST_PROD0_LO, sc->bge_tx_prodidx);
	if (BGE_CHIPREV(sc->bge_chipid) == BGE_CHIPREV_5700_BX)
		CSR_WRITE_4(sc, BGE_MBX_TX_HOST_PROD0_LO, sc->bge_tx_prodidx);

	/* NIC-memory send ring not used; initialize to zero. */
	CSR_WRITE_4(sc, BGE_MBX_TX_NIC_PROD0_LO, 0);
	if (BGE_CHIPREV(sc->bge_chipid) == BGE_CHIPREV_5700_BX)
		CSR_WRITE_4(sc, BGE_MBX_TX_NIC_PROD0_LO, 0);

	SLIST_INIT(&sc->txdma_list);
	for (i = 0; i < BGE_TX_RING_CNT; i++) {
		if (bus_dmamap_create(sc->bge_dmatag, BGE_JLEN,
		    BGE_NTXSEG, BGE_JLEN, 0, BUS_DMA_NOWAIT,
		    &dmamap))
			return (ENOBUFS);
		if (dmamap == NULL)
			panic("dmamap NULL in bge_init_tx_ring");
		dma = malloc(sizeof(*dma), M_DEVBUF, M_NOWAIT);
		if (dma == NULL) {
			printf("%s: can't alloc txdmamap_pool_entry\n",
			    sc->bge_dev.dv_xname);
			bus_dmamap_destroy(sc->bge_dmatag, dmamap);
			return (ENOMEM);
		}
		dma->dmamap = dmamap;
		SLIST_INSERT_HEAD(&sc->txdma_list, dma, link);
	}

	sc->bge_flags |= BGE_TXRING_VALID;

	return (0);
}

void
bge_setmulti(struct bge_softc *sc)
{
	struct arpcom		*ac = &sc->arpcom;
	struct ifnet		*ifp = &ac->ac_if;
	struct ether_multi	*enm;
	struct ether_multistep  step;
	u_int32_t		hashes[4] = { 0, 0, 0, 0 };
	u_int32_t		h;
	int			i;

	/* First, zot all the existing filters. */
	for (i = 0; i < 4; i++)
		CSR_WRITE_4(sc, BGE_MAR0 + (i * 4), 0);

	/* Now program new ones. */
	if (ifp->if_flags & IFF_ALLMULTI || ifp->if_flags & IFF_PROMISC) {
allmulti:
		for (i = 0; i < 4; i++)
			CSR_WRITE_4(sc, BGE_MAR0 + (i * 4), 0xFFFFFFFF);
		return;
	}

	ETHER_FIRST_MULTI(step, ac, enm);
	while (enm != NULL) {
		if (bcmp(enm->enm_addrlo, enm->enm_addrhi, ETHER_ADDR_LEN)) {
			ifp->if_flags |= IFF_ALLMULTI;
			goto allmulti;
		}
		h = ether_crc32_le(enm->enm_addrlo, ETHER_ADDR_LEN) & 0x7F;
		hashes[(h & 0x60) >> 5] |= 1 << (h & 0x1F);
		ETHER_NEXT_MULTI(step, enm);
	}

	for (i = 0; i < 4; i++)
		CSR_WRITE_4(sc, BGE_MAR0 + (i * 4), hashes[i]);
}

/*
 * Do endian, PCI and DMA initialization. Also check the on-board ROM
 * self-test results.
 */
int
bge_chipinit(struct bge_softc *sc)
{
	struct pci_attach_args	*pa = &(sc->bge_pa);
	u_int32_t dma_rw_ctl;
	int i;

	/* Set endianness before we access any non-PCI registers. */
	pci_conf_write(pa->pa_pc, pa->pa_tag, BGE_PCI_MISC_CTL,
	    BGE_INIT);

	/*
	 * Check the 'ROM failed' bit on the RX CPU to see if
	 * self-tests passed.
	 */
	if (CSR_READ_4(sc, BGE_RXCPU_MODE) & BGE_RXCPUMODE_ROMFAIL) {
		printf("%s: RX CPU self-diagnostics failed!\n",
		    sc->bge_dev.dv_xname);
		return (ENODEV);
	}

	/* Clear the MAC control register */
	CSR_WRITE_4(sc, BGE_MAC_MODE, 0);

	/*
	 * Clear the MAC statistics block in the NIC's
	 * internal memory.
	 */
	for (i = BGE_STATS_BLOCK;
	    i < BGE_STATS_BLOCK_END + 1; i += sizeof(u_int32_t))
		BGE_MEMWIN_WRITE(pa->pa_pc, pa->pa_tag, i, 0);

	for (i = BGE_STATUS_BLOCK;
	    i < BGE_STATUS_BLOCK_END + 1; i += sizeof(u_int32_t))
		BGE_MEMWIN_WRITE(pa->pa_pc, pa->pa_tag, i, 0);

	/* Set up the PCI DMA control register. */
	if (sc->bge_pcie) {
		/* PCI Express bus */
		u_int32_t device_ctl;

		/* alternative from Linux driver */
#define DMA_CTRL_WRITE_PCIE_H20MARK_128		0x00180000
#define DMA_CTRL_WRITE_PCIE_H20MARK_256		0x00380000

		dma_rw_ctl = 0x76000000; /* XXX XXX XXX */;
		device_ctl = pci_conf_read(pa->pa_pc, pa->pa_tag,
					   BGE_PCI_CONF_DEV_CTRL);

		if ((device_ctl & 0x00e0) && 0) {
			/*
			 * This clause is exactly what the Broadcom-supplied
			 * Linux does; but given overall register programming
			 * by bge(4), this larger DMA-write watermark
			 * value causes BCM5721 chips to totally wedge.
			 */
			dma_rw_ctl |= BGE_PCIDMA_RWCTL_PCIE_WRITE_WATRMARK_256;
		} else {
			dma_rw_ctl |= BGE_PCIDMA_RWCTL_PCIE_WRITE_WATRMARK_128;
		}
	} else if (sc->bge_pcix) {
		/* PCI-X bus */
		if (BGE_IS_5714_FAMILY(sc)) {
			dma_rw_ctl = BGE_PCI_READ_CMD|BGE_PCI_WRITE_CMD;
			dma_rw_ctl &= ~BGE_PCIDMARWCTL_ONEDMA_ATONCE; /* XXX */
			/* XXX magic values, Broadcom-supplied Linux driver */
			if (BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5780)
				dma_rw_ctl |= (1 << 20) | (1 << 18) |
				    BGE_PCIDMARWCTL_ONEDMA_ATONCE;
			else
				dma_rw_ctl |= (1<<20) | (1<<18) | (1 << 15);
		} else if (BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5704)
			/*
			 * The 5704 uses a different encoding of read/write
			 * watermarks.
			 */
			dma_rw_ctl = BGE_PCI_READ_CMD|BGE_PCI_WRITE_CMD |
			    (0x7 << BGE_PCIDMARWCTL_RD_WAT_SHIFT) |
			    (0x3 << BGE_PCIDMARWCTL_WR_WAT_SHIFT);
		else
			dma_rw_ctl = BGE_PCI_READ_CMD|BGE_PCI_WRITE_CMD |
			    (0x3 << BGE_PCIDMARWCTL_RD_WAT_SHIFT) |
			    (0x3 << BGE_PCIDMARWCTL_WR_WAT_SHIFT) |
			    (0x0F);

		/*
		 * 5703 and 5704 need ONEDMA_AT_ONCE as a workaround
		 * for hardware bugs.
		 */
		if (BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5703 ||
		    BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5704) {
			u_int32_t tmp;

			tmp = CSR_READ_4(sc, BGE_PCI_CLKCTL) & 0x1f;
			if (tmp == 0x6 || tmp == 0x7)
				dma_rw_ctl |= BGE_PCIDMARWCTL_ONEDMA_ATONCE;
		}
 	} else {
		/* Conventional PCI bus */
		dma_rw_ctl = BGE_PCI_READ_CMD | BGE_PCI_WRITE_CMD |
		    (0x7 << BGE_PCIDMARWCTL_RD_WAT_SHIFT) |
		    (0x7 << BGE_PCIDMARWCTL_WR_WAT_SHIFT) |
		    (0x0f);
	}
 
	if (BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5703 ||
	    BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5704 ||
	    BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5705)
		dma_rw_ctl &= ~BGE_PCIDMARWCTL_MINDMA;

	pci_conf_write(pa->pa_pc, pa->pa_tag, BGE_PCI_DMA_RW_CTL, dma_rw_ctl);

	/*
	 * Set up general mode register.
	 */
#ifndef BGE_CHECKSUM
	CSR_WRITE_4(sc, BGE_MODE_CTL, BGE_DMA_SWAP_OPTIONS|
		    BGE_MODECTL_MAC_ATTN_INTR|BGE_MODECTL_HOST_SEND_BDS|
		    BGE_MODECTL_TX_NO_PHDR_CSUM|BGE_MODECTL_RX_NO_PHDR_CSUM);
#else
	CSR_WRITE_4(sc, BGE_MODE_CTL, BGE_DMA_SWAP_OPTIONS|
		    BGE_MODECTL_MAC_ATTN_INTR|BGE_MODECTL_HOST_SEND_BDS);
#endif

	/*
	 * Disable memory write invalidate.  Apparently it is not supported
	 * properly by these devices.
	 */
	PCI_CLRBIT(pa->pa_pc, pa->pa_tag, PCI_COMMAND_STATUS_REG,
	    PCI_COMMAND_INVALIDATE_ENABLE);

#ifdef __brokenalpha__
	/*
	 * Must insure that we do not cross an 8K (bytes) boundary
	 * for DMA reads.  Our highest limit is 1K bytes.  This is a
	 * restriction on some ALPHA platforms with early revision
	 * 21174 PCI chipsets, such as the AlphaPC 164lx
	 */
	PCI_SETBIT(pa->pa_pc, pa->pa_tag, BGE_PCI_DMA_RW_CTL,
	    BGE_PCI_READ_BNDRY_1024);
#endif

	/* Set the timer prescaler (always 66MHz) */
	CSR_WRITE_4(sc, BGE_MISC_CFG, 65 << 1/*BGE_32BITTIME_66MHZ*/);

	return (0);
}

int
bge_blockinit(struct bge_softc *sc)
{
	volatile struct bge_rcb		*rcb;
	vaddr_t			rcb_addr;
	int			i;
	bge_hostaddr		taddr;

	/*
	 * Initialize the memory window pointer register so that
	 * we can access the first 32K of internal NIC RAM. This will
	 * allow us to set up the TX send ring RCBs and the RX return
	 * ring RCBs, plus other things which live in NIC memory.
	 */
	CSR_WRITE_4(sc, BGE_PCI_MEMWIN_BASEADDR, 0);

	/* Configure mbuf memory pool */
	if (!(BGE_IS_5705_OR_BEYOND(sc))) {
		if (sc->bge_extram)
			CSR_WRITE_4(sc, BGE_BMAN_MBUFPOOL_BASEADDR,
			    BGE_EXT_SSRAM);
		else
			CSR_WRITE_4(sc, BGE_BMAN_MBUFPOOL_BASEADDR,
			    BGE_BUFFPOOL_1);

		if (BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5704)
			CSR_WRITE_4(sc, BGE_BMAN_MBUFPOOL_LEN, 0x10000);
		else
			CSR_WRITE_4(sc, BGE_BMAN_MBUFPOOL_LEN, 0x18000);

		/* Configure DMA resource pool */
		CSR_WRITE_4(sc, BGE_BMAN_DMA_DESCPOOL_BASEADDR,
		    BGE_DMA_DESCRIPTORS);
		CSR_WRITE_4(sc, BGE_BMAN_DMA_DESCPOOL_LEN, 0x2000);
	}

	/* Configure mbuf pool watermarks */
	/* new Broadcom docs strongly recommend these: */
	if (!(BGE_IS_5705_OR_BEYOND(sc))) {
		CSR_WRITE_4(sc, BGE_BMAN_MBUFPOOL_READDMA_LOWAT, 0x50);
		CSR_WRITE_4(sc, BGE_BMAN_MBUFPOOL_MACRX_LOWAT, 0x20);
		CSR_WRITE_4(sc, BGE_BMAN_MBUFPOOL_HIWAT, 0x60);
	} else {
		CSR_WRITE_4(sc, BGE_BMAN_MBUFPOOL_READDMA_LOWAT, 0x0);
		CSR_WRITE_4(sc, BGE_BMAN_MBUFPOOL_MACRX_LOWAT, 0x10);
		CSR_WRITE_4(sc, BGE_BMAN_MBUFPOOL_HIWAT, 0x60);
	}

	/* Configure DMA resource watermarks */
	CSR_WRITE_4(sc, BGE_BMAN_DMA_DESCPOOL_LOWAT, 5);
	CSR_WRITE_4(sc, BGE_BMAN_DMA_DESCPOOL_HIWAT, 10);

	/* Enable buffer manager */
	CSR_WRITE_4(sc, BGE_BMAN_MODE,
	    BGE_BMANMODE_ENABLE|BGE_BMANMODE_LOMBUF_ATTN);

	/* Poll for buffer manager start indication */
	for (i = 0; i < 2000; i++) {
		if (CSR_READ_4(sc, BGE_BMAN_MODE) & BGE_BMANMODE_ENABLE)
			break;
		DELAY(10);
	}

	if (i == 2000) {
		printf("%s: buffer manager failed to start\n",
		    sc->bge_dev.dv_xname);
		return (ENXIO);
	}

	/* Enable flow-through queues */
	CSR_WRITE_4(sc, BGE_FTQ_RESET, 0xFFFFFFFF);
	CSR_WRITE_4(sc, BGE_FTQ_RESET, 0);

	/* Wait until queue initialization is complete */
	for (i = 0; i < 2000; i++) {
		if (CSR_READ_4(sc, BGE_FTQ_RESET) == 0)
			break;
		DELAY(10);
	}

	if (i == 2000) {
		printf("%s: flow-through queue init failed\n",
		    sc->bge_dev.dv_xname);
		return (ENXIO);
	}

	/* Initialize the standard RX ring control block */
	rcb = &sc->bge_rdata->bge_info.bge_std_rx_rcb;
	BGE_HOSTADDR(rcb->bge_hostaddr, BGE_RING_DMA_ADDR(sc, bge_rx_std_ring));
	if (BGE_IS_5705_OR_BEYOND(sc))
		rcb->bge_maxlen_flags = BGE_RCB_MAXLEN_FLAGS(512, 0);
	else
		rcb->bge_maxlen_flags =
		    BGE_RCB_MAXLEN_FLAGS(ETHER_MAX_DIX_LEN, 0);
	if (sc->bge_extram)
		rcb->bge_nicaddr = BGE_EXT_STD_RX_RINGS;
	else
		rcb->bge_nicaddr = BGE_STD_RX_RINGS;
	CSR_WRITE_4(sc, BGE_RX_STD_RCB_HADDR_HI, rcb->bge_hostaddr.bge_addr_hi);
	CSR_WRITE_4(sc, BGE_RX_STD_RCB_HADDR_LO, rcb->bge_hostaddr.bge_addr_lo);
	CSR_WRITE_4(sc, BGE_RX_STD_RCB_MAXLEN_FLAGS, rcb->bge_maxlen_flags);
	CSR_WRITE_4(sc, BGE_RX_STD_RCB_NICADDR, rcb->bge_nicaddr);

	/*
	 * Initialize the Jumbo RX ring control block
	 * We set the 'ring disabled' bit in the flags
	 * field until we're actually ready to start
	 * using this ring (i.e. once we set the MTU
	 * high enough to require it).
	 */
	if (BGE_IS_JUMBO_CAPABLE(sc)) {
		rcb = &sc->bge_rdata->bge_info.bge_jumbo_rx_rcb;
		BGE_HOSTADDR(rcb->bge_hostaddr,
		    BGE_RING_DMA_ADDR(sc, bge_rx_jumbo_ring));
		rcb->bge_maxlen_flags =
		    BGE_RCB_MAXLEN_FLAGS(BGE_JUMBO_FRAMELEN,
		        BGE_RCB_FLAG_RING_DISABLED);
		if (sc->bge_extram)
			rcb->bge_nicaddr = BGE_EXT_JUMBO_RX_RINGS;
		else
			rcb->bge_nicaddr = BGE_JUMBO_RX_RINGS;

		CSR_WRITE_4(sc, BGE_RX_JUMBO_RCB_HADDR_HI,
		    rcb->bge_hostaddr.bge_addr_hi);
		CSR_WRITE_4(sc, BGE_RX_JUMBO_RCB_HADDR_LO,
		    rcb->bge_hostaddr.bge_addr_lo);
		CSR_WRITE_4(sc, BGE_RX_JUMBO_RCB_MAXLEN_FLAGS,
		    rcb->bge_maxlen_flags);
		CSR_WRITE_4(sc, BGE_RX_JUMBO_RCB_NICADDR,
		    rcb->bge_nicaddr);

		/* Set up dummy disabled mini ring RCB */
		rcb = &sc->bge_rdata->bge_info.bge_mini_rx_rcb;
		rcb->bge_maxlen_flags =
		    BGE_RCB_MAXLEN_FLAGS(0, BGE_RCB_FLAG_RING_DISABLED);
		CSR_WRITE_4(sc, BGE_RX_MINI_RCB_MAXLEN_FLAGS,
		    rcb->bge_maxlen_flags);

		bus_dmamap_sync(sc->bge_dmatag, sc->bge_ring_map,
		    offsetof(struct bge_ring_data, bge_info),
		    sizeof (struct bge_gib),
		    BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
	}

	/*
	 * Set the BD ring replentish thresholds. The recommended
	 * values are 1/8th the number of descriptors allocated to
	 * each ring.
	 */
	CSR_WRITE_4(sc, BGE_RBDI_STD_REPL_THRESH, BGE_STD_RX_RING_CNT/8);
	CSR_WRITE_4(sc, BGE_RBDI_JUMBO_REPL_THRESH, BGE_JUMBO_RX_RING_CNT/8);

	/*
	 * Disable all unused send rings by setting the 'ring disabled'
	 * bit in the flags field of all the TX send ring control blocks.
	 * These are located in NIC memory.
	 */
	rcb_addr = BGE_MEMWIN_START + BGE_SEND_RING_RCB;
	for (i = 0; i < BGE_TX_RINGS_EXTSSRAM_MAX; i++) {
		RCB_WRITE_4(sc, rcb_addr, bge_maxlen_flags,
		    BGE_RCB_MAXLEN_FLAGS(0, BGE_RCB_FLAG_RING_DISABLED));
		RCB_WRITE_4(sc, rcb_addr, bge_nicaddr, 0);
		rcb_addr += sizeof(struct bge_rcb);
	}

	/* Configure TX RCB 0 (we use only the first ring) */
	rcb_addr = BGE_MEMWIN_START + BGE_SEND_RING_RCB;
	BGE_HOSTADDR(taddr, BGE_RING_DMA_ADDR(sc, bge_tx_ring));
	RCB_WRITE_4(sc, rcb_addr, bge_hostaddr.bge_addr_hi, taddr.bge_addr_hi);
	RCB_WRITE_4(sc, rcb_addr, bge_hostaddr.bge_addr_lo, taddr.bge_addr_lo);
	RCB_WRITE_4(sc, rcb_addr, bge_nicaddr,
		    BGE_NIC_TXRING_ADDR(0, BGE_TX_RING_CNT));
	if (!(BGE_IS_5705_OR_BEYOND(sc)))
		RCB_WRITE_4(sc, rcb_addr, bge_maxlen_flags,
		    BGE_RCB_MAXLEN_FLAGS(BGE_TX_RING_CNT, 0));

	/* Disable all unused RX return rings */
	rcb_addr = BGE_MEMWIN_START + BGE_RX_RETURN_RING_RCB;
	for (i = 0; i < BGE_RX_RINGS_MAX; i++) {
		RCB_WRITE_4(sc, rcb_addr, bge_hostaddr.bge_addr_hi, 0);
		RCB_WRITE_4(sc, rcb_addr, bge_hostaddr.bge_addr_lo, 0);
		RCB_WRITE_4(sc, rcb_addr, bge_maxlen_flags,
		    BGE_RCB_MAXLEN_FLAGS(sc->bge_return_ring_cnt,
			BGE_RCB_FLAG_RING_DISABLED));
		RCB_WRITE_4(sc, rcb_addr, bge_nicaddr, 0);
		CSR_WRITE_4(sc, BGE_MBX_RX_CONS0_LO +
		    (i * (sizeof(u_int64_t))), 0);
		rcb_addr += sizeof(struct bge_rcb);
	}

	/* Initialize RX ring indexes */
	CSR_WRITE_4(sc, BGE_MBX_RX_STD_PROD_LO, 0);
	CSR_WRITE_4(sc, BGE_MBX_RX_JUMBO_PROD_LO, 0);
	CSR_WRITE_4(sc, BGE_MBX_RX_MINI_PROD_LO, 0);

	/*
	 * Set up RX return ring 0
	 * Note that the NIC address for RX return rings is 0x00000000.
	 * The return rings live entirely within the host, so the
	 * nicaddr field in the RCB isn't used.
	 */
	rcb_addr = BGE_MEMWIN_START + BGE_RX_RETURN_RING_RCB;
	BGE_HOSTADDR(taddr, BGE_RING_DMA_ADDR(sc, bge_rx_return_ring));
	RCB_WRITE_4(sc, rcb_addr, bge_hostaddr.bge_addr_hi, taddr.bge_addr_hi);
	RCB_WRITE_4(sc, rcb_addr, bge_hostaddr.bge_addr_lo, taddr.bge_addr_lo);
	RCB_WRITE_4(sc, rcb_addr, bge_nicaddr, 0x00000000);
	RCB_WRITE_4(sc, rcb_addr, bge_maxlen_flags,
	    BGE_RCB_MAXLEN_FLAGS(sc->bge_return_ring_cnt, 0));

	/* Set random backoff seed for TX */
	CSR_WRITE_4(sc, BGE_TX_RANDOM_BACKOFF,
	    sc->arpcom.ac_enaddr[0] + sc->arpcom.ac_enaddr[1] +
	    sc->arpcom.ac_enaddr[2] + sc->arpcom.ac_enaddr[3] +
	    sc->arpcom.ac_enaddr[4] + sc->arpcom.ac_enaddr[5] +
	    BGE_TX_BACKOFF_SEED_MASK);

	/* Set inter-packet gap */
	CSR_WRITE_4(sc, BGE_TX_LENGTHS, 0x2620);

	/*
	 * Specify which ring to use for packets that don't match
	 * any RX rules.
	 */
	CSR_WRITE_4(sc, BGE_RX_RULES_CFG, 0x08);

	/*
	 * Configure number of RX lists. One interrupt distribution
	 * list, sixteen active lists, one bad frames class.
	 */
	CSR_WRITE_4(sc, BGE_RXLP_CFG, 0x181);

	/* Inialize RX list placement stats mask. */
	CSR_WRITE_4(sc, BGE_RXLP_STATS_ENABLE_MASK, 0x007FFFFF);
	CSR_WRITE_4(sc, BGE_RXLP_STATS_CTL, 0x1);

	/* Disable host coalescing until we get it set up */
	CSR_WRITE_4(sc, BGE_HCC_MODE, 0x00000000);

	/* Poll to make sure it's shut down. */
	for (i = 0; i < 2000; i++) {
		if (!(CSR_READ_4(sc, BGE_HCC_MODE) & BGE_HCCMODE_ENABLE))
			break;
		DELAY(10);
	}

	if (i == 2000) {
		printf("%s: host coalescing engine failed to idle\n",
		    sc->bge_dev.dv_xname);
		return (ENXIO);
	}

	/* Set up host coalescing defaults */
	CSR_WRITE_4(sc, BGE_HCC_RX_COAL_TICKS, sc->bge_rx_coal_ticks);
	CSR_WRITE_4(sc, BGE_HCC_TX_COAL_TICKS, sc->bge_tx_coal_ticks);
	CSR_WRITE_4(sc, BGE_HCC_RX_MAX_COAL_BDS, sc->bge_rx_max_coal_bds);
	CSR_WRITE_4(sc, BGE_HCC_TX_MAX_COAL_BDS, sc->bge_tx_max_coal_bds);
	if (!(BGE_IS_5705_OR_BEYOND(sc))) {
		CSR_WRITE_4(sc, BGE_HCC_RX_COAL_TICKS_INT, 0);
		CSR_WRITE_4(sc, BGE_HCC_TX_COAL_TICKS_INT, 0);
	}
	CSR_WRITE_4(sc, BGE_HCC_RX_MAX_COAL_BDS_INT, 0);
	CSR_WRITE_4(sc, BGE_HCC_TX_MAX_COAL_BDS_INT, 0);

	/* Set up address of statistics block */
	if (!(BGE_IS_5705_OR_BEYOND(sc))) {
		CSR_WRITE_4(sc, BGE_HCC_STATS_ADDR_HI, 0);
		CSR_WRITE_4(sc, BGE_HCC_STATS_ADDR_LO,
			    BGE_RING_DMA_ADDR(sc, bge_info.bge_stats));

		CSR_WRITE_4(sc, BGE_HCC_STATS_BASEADDR, BGE_STATS_BLOCK);
		CSR_WRITE_4(sc, BGE_HCC_STATUSBLK_BASEADDR, BGE_STATUS_BLOCK);
		CSR_WRITE_4(sc, BGE_HCC_STATS_TICKS, sc->bge_stat_ticks);
	}

	/* Set up address of status block */
	BGE_HOSTADDR(taddr, BGE_RING_DMA_ADDR(sc, bge_status_block));
	CSR_WRITE_4(sc, BGE_HCC_STATUSBLK_ADDR_HI, taddr.bge_addr_hi);
	CSR_WRITE_4(sc, BGE_HCC_STATUSBLK_ADDR_LO, taddr.bge_addr_lo);

	sc->bge_rdata->bge_status_block.bge_idx[0].bge_rx_prod_idx = 0;
	sc->bge_rdata->bge_status_block.bge_idx[0].bge_tx_cons_idx = 0;

	/* Turn on host coalescing state machine */
	CSR_WRITE_4(sc, BGE_HCC_MODE, BGE_HCCMODE_ENABLE);

	/* Turn on RX BD completion state machine and enable attentions */
	CSR_WRITE_4(sc, BGE_RBDC_MODE,
	    BGE_RBDCMODE_ENABLE|BGE_RBDCMODE_ATTN);

	/* Turn on RX list placement state machine */
	CSR_WRITE_4(sc, BGE_RXLP_MODE, BGE_RXLPMODE_ENABLE);

	/* Turn on RX list selector state machine. */
	if (!(BGE_IS_5705_OR_BEYOND(sc)))
		CSR_WRITE_4(sc, BGE_RXLS_MODE, BGE_RXLSMODE_ENABLE);

	/* Turn on DMA, clear stats */
	CSR_WRITE_4(sc, BGE_MAC_MODE, BGE_MACMODE_TXDMA_ENB|
	    BGE_MACMODE_RXDMA_ENB|BGE_MACMODE_RX_STATS_CLEAR|
	    BGE_MACMODE_TX_STATS_CLEAR|BGE_MACMODE_RX_STATS_ENB|
	    BGE_MACMODE_TX_STATS_ENB|BGE_MACMODE_FRMHDR_DMA_ENB|
	    (sc->bge_tbi ? BGE_PORTMODE_TBI : BGE_PORTMODE_MII));

	/* Set misc. local control, enable interrupts on attentions */
	CSR_WRITE_4(sc, BGE_MISC_LOCAL_CTL, BGE_MLC_INTR_ONATTN);

#ifdef notdef
	/* Assert GPIO pins for PHY reset */
	BGE_SETBIT(sc, BGE_MISC_LOCAL_CTL, BGE_MLC_MISCIO_OUT0|
	    BGE_MLC_MISCIO_OUT1|BGE_MLC_MISCIO_OUT2);
	BGE_SETBIT(sc, BGE_MISC_LOCAL_CTL, BGE_MLC_MISCIO_OUTEN0|
	    BGE_MLC_MISCIO_OUTEN1|BGE_MLC_MISCIO_OUTEN2);
#endif

	/* Turn on DMA completion state machine */
	if (!(BGE_IS_5705_OR_BEYOND(sc)))
		CSR_WRITE_4(sc, BGE_DMAC_MODE, BGE_DMACMODE_ENABLE);

	/* Turn on write DMA state machine */
	CSR_WRITE_4(sc, BGE_WDMA_MODE,
	    BGE_WDMAMODE_ENABLE|BGE_WDMAMODE_ALL_ATTNS);

	/* Turn on read DMA state machine */
	{
		uint32_t dma_read_modebits;

		dma_read_modebits =
		  BGE_RDMAMODE_ENABLE | BGE_RDMAMODE_ALL_ATTNS;

		if (sc->bge_pcie && 0)
			dma_read_modebits |= BGE_RDMA_MODE_FIFO_LONG_BURST;

		CSR_WRITE_4(sc, BGE_RDMA_MODE, dma_read_modebits);
	}

	/* Turn on RX data completion state machine */
	CSR_WRITE_4(sc, BGE_RDC_MODE, BGE_RDCMODE_ENABLE);

	/* Turn on RX BD initiator state machine */
	CSR_WRITE_4(sc, BGE_RBDI_MODE, BGE_RBDIMODE_ENABLE);

	/* Turn on RX data and RX BD initiator state machine */
	CSR_WRITE_4(sc, BGE_RDBDI_MODE, BGE_RDBDIMODE_ENABLE);

	/* Turn on Mbuf cluster free state machine */
	if (!(BGE_IS_5705_OR_BEYOND(sc)))
		CSR_WRITE_4(sc, BGE_MBCF_MODE, BGE_MBCFMODE_ENABLE);

	/* Turn on send BD completion state machine */
	CSR_WRITE_4(sc, BGE_SBDC_MODE, BGE_SBDCMODE_ENABLE);

	/* Turn on send data completion state machine */
	CSR_WRITE_4(sc, BGE_SDC_MODE, BGE_SDCMODE_ENABLE);

	/* Turn on send data initiator state machine */
	CSR_WRITE_4(sc, BGE_SDI_MODE, BGE_SDIMODE_ENABLE);

	/* Turn on send BD initiator state machine */
	CSR_WRITE_4(sc, BGE_SBDI_MODE, BGE_SBDIMODE_ENABLE);

	/* Turn on send BD selector state machine */
	CSR_WRITE_4(sc, BGE_SRS_MODE, BGE_SRSMODE_ENABLE);

	CSR_WRITE_4(sc, BGE_SDI_STATS_ENABLE_MASK, 0x007FFFFF);
	CSR_WRITE_4(sc, BGE_SDI_STATS_CTL,
	    BGE_SDISTATSCTL_ENABLE|BGE_SDISTATSCTL_FASTER);

	/* ack/clear link change events */
	CSR_WRITE_4(sc, BGE_MAC_STS, BGE_MACSTAT_SYNC_CHANGED|
	    BGE_MACSTAT_CFG_CHANGED|BGE_MACSTAT_MI_COMPLETE|
	    BGE_MACSTAT_LINK_CHANGED);

	/* Enable PHY auto polling (for MII/GMII only) */
	if (sc->bge_tbi) {
		CSR_WRITE_4(sc, BGE_MI_STS, BGE_MISTS_LINK);
 	} else {
		BGE_SETBIT(sc, BGE_MI_MODE, BGE_MIMODE_AUTOPOLL|10<<16);
		if (BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5700 &&
		    sc->bge_chipid != BGE_CHIPID_BCM5700_B1)
			CSR_WRITE_4(sc, BGE_MAC_EVT_ENB,
			    BGE_EVTENB_MI_INTERRUPT);
	}

	/*
	 * Clear any pending link state attention.
	 * Otherwise some link state change events may be lost until attention
	 * is cleared by bge_intr() -> bge_link_upd() sequence.
	 * It's not necessary on newer BCM chips - perhaps enabling link
	 * state change attentions implies clearing pending attention.
	 */
	CSR_WRITE_4(sc, BGE_MAC_STS, BGE_MACSTAT_SYNC_CHANGED|
	    BGE_MACSTAT_CFG_CHANGED|BGE_MACSTAT_MI_COMPLETE|
	    BGE_MACSTAT_LINK_CHANGED);

	/* Enable link state change attentions. */
	BGE_SETBIT(sc, BGE_MAC_EVT_ENB, BGE_EVTENB_LINK_CHANGED);

	return (0);
}

const struct bge_revision *
bge_lookup_rev(u_int32_t chipid)
{
	const struct bge_revision *br;

	for (br = bge_revisions; br->br_name != NULL; br++) {
		if (br->br_chipid == chipid)
			return (br);
	}

	for (br = bge_majorrevs; br->br_name != NULL; br++) {
		if (br->br_chipid == BGE_ASICREV(chipid))
			return (br);
	}

	return (NULL);
}

/*
 * Probe for a Broadcom chip. Check the PCI vendor and device IDs
 * against our list and return its name if we find a match. Note
 * that since the Broadcom controller contains VPD support, we
 * can get the device name string from the controller itself instead
 * of the compiled-in string. This is a little slow, but it guarantees
 * we'll always announce the right product name.
 */
int
bge_probe(struct device *parent, void *match, void *aux)
{
	return (pci_matchbyid((struct pci_attach_args *)aux, bge_devices,
	    sizeof(bge_devices)/sizeof(bge_devices[0])));
}

void
bge_attach(struct device *parent, struct device *self, void *aux)
{
	struct bge_softc	*sc = (struct bge_softc *)self;
	struct pci_attach_args	*pa = aux;
	pci_chipset_tag_t	pc = pa->pa_pc;
	const struct bge_revision *br;
	pcireg_t		pm_ctl, memtype;
	pci_intr_handle_t	ih;
	const char		*intrstr = NULL;
	bus_size_t		size;
	bus_dma_segment_t	seg;
	int			rseg;
	u_int32_t		hwcfg = 0;
	u_int32_t		mac_addr = 0;
	struct ifnet		*ifp;
	caddr_t			kva;

	sc->bge_pa = *pa;

	/*
	 * Map control/status registers.
	 */
	DPRINTFN(5, ("Map control/status regs\n"));

	DPRINTFN(5, ("pci_mapreg_map\n"));
	memtype = pci_mapreg_type(pa->pa_pc, pa->pa_tag, BGE_PCI_BAR0);
 	switch (memtype) {
	case PCI_MAPREG_TYPE_MEM | PCI_MAPREG_MEM_TYPE_32BIT:
	case PCI_MAPREG_TYPE_MEM | PCI_MAPREG_MEM_TYPE_64BIT:
		if (pci_mapreg_map(pa, BGE_PCI_BAR0,
		    memtype, 0, &sc->bge_btag, &sc->bge_bhandle,
		    NULL, &size, 0) == 0)
			break;
	default:
		printf(": can't find mem space\n");
		return;
	}

	DPRINTFN(5, ("pci_intr_map\n"));
	if (pci_intr_map(pa, &ih)) {
		printf(": couldn't map interrupt\n");
		goto fail_1;
	}

	DPRINTFN(5, ("pci_intr_string\n"));
	intrstr = pci_intr_string(pc, ih);

	DPRINTFN(5, ("pci_intr_establish\n"));
	sc->bge_intrhand = pci_intr_establish(pc, ih, IPL_NET, bge_intr, sc,
	    sc->bge_dev.dv_xname);
	if (sc->bge_intrhand == NULL) {
		printf(": couldn't establish interrupt");
		if (intrstr != NULL)
			printf(" at %s", intrstr);
		printf("\n");
		goto fail_1;
	}

	/*
	 * Kludge for 5700 Bx bug: a hardware bug (PCIX byte enable?)
	 * can clobber the chip's PCI config-space power control registers,
	 * leaving the card in D3 powersave state.
	 * We do not have memory-mapped registers in this state,
	 * so force device into D0 state before starting initialization.
	 */
	pm_ctl = pci_conf_read(pc, pa->pa_tag, BGE_PCI_PWRMGMT_CMD);
	pm_ctl &= ~(PCI_PWR_D0|PCI_PWR_D1|PCI_PWR_D2|PCI_PWR_D3);
	pm_ctl |= (1 << 8) | PCI_PWR_D0 ; /* D0 state */
	pci_conf_write(pc, pa->pa_tag, BGE_PCI_PWRMGMT_CMD, pm_ctl);
	DELAY(1000);	/* 27 usec is allegedly sufficent */

	/*
	 * Save ASIC rev.
	 */

	sc->bge_chipid =
            pci_conf_read(pc, pa->pa_tag, BGE_PCI_MISC_CTL) &
            BGE_PCIMISCCTL_ASICREV;

	printf(", ");
	br = bge_lookup_rev(sc->bge_chipid);
	if (br == NULL)
		printf("unknown ASIC (0x%04x)", sc->bge_chipid >> 16);
	else
		printf("%s (0x%04x)", br->br_name, sc->bge_chipid >> 16);

	printf(": %s", intrstr);

	/*
	 * PCI Express check.
	 */
	sc->bge_pcie = 0;
	if (pci_get_capability(pa->pa_pc, pa->pa_tag, PCI_CAP_PCIEXPRESS,
	    NULL, NULL) != 0)
		sc->bge_pcie = 1;

	/*
	 * PCI-X check.
	 */
	sc->bge_pcix = 0;
	if ((pci_conf_read(pa->pa_pc, pa->pa_tag, BGE_PCI_PCISTATE) &
	    BGE_PCISTATE_PCI_BUSMODE) == 0)
		sc->bge_pcix = 1;

	/* Try to reset the chip. */
	DPRINTFN(5, ("bge_reset\n"));
	bge_reset(sc);

	if (bge_chipinit(sc)) {
		printf(": chip initialization failed\n");
		goto fail_2;
	}

	/*
	 * Get station address from the EEPROM.
	 */
	mac_addr = bge_readmem_ind(sc, 0x0c14);
	if ((mac_addr >> 16) == 0x484b) {
		sc->arpcom.ac_enaddr[0] = (u_char)(mac_addr >> 8);
		sc->arpcom.ac_enaddr[1] = (u_char)mac_addr;
		mac_addr = bge_readmem_ind(sc, 0x0c18);
		sc->arpcom.ac_enaddr[2] = (u_char)(mac_addr >> 24);
		sc->arpcom.ac_enaddr[3] = (u_char)(mac_addr >> 16);
		sc->arpcom.ac_enaddr[4] = (u_char)(mac_addr >> 8);
		sc->arpcom.ac_enaddr[5] = (u_char)mac_addr;
	} else if (bge_read_eeprom(sc, (caddr_t)&sc->arpcom.ac_enaddr,
	    BGE_EE_MAC_OFFSET + 2, ETHER_ADDR_LEN)) {
		printf(": failed to read station address\n");
		goto fail_2;
	}

	/*
	 * A Broadcom chip was detected. Inform the world.
	 */
	printf(", address %s\n",
	    ether_sprintf(sc->arpcom.ac_enaddr));

	/* Allocate the general information block and ring buffers. */
	sc->bge_dmatag = pa->pa_dmat;
	DPRINTFN(5, ("bus_dmamem_alloc\n"));
	if (bus_dmamem_alloc(sc->bge_dmatag, sizeof(struct bge_ring_data),
			     PAGE_SIZE, 0, &seg, 1, &rseg, BUS_DMA_NOWAIT)) {
		printf(": can't alloc rx buffers\n");
		goto fail_2;
	}
	DPRINTFN(5, ("bus_dmamem_map\n"));
	if (bus_dmamem_map(sc->bge_dmatag, &seg, rseg,
			   sizeof(struct bge_ring_data), &kva,
			   BUS_DMA_NOWAIT)) {
		printf(": can't map dma buffers (%d bytes)\n",
		    sizeof(struct bge_ring_data));
		goto fail_3;
	}
	DPRINTFN(5, ("bus_dmamem_create\n"));
	if (bus_dmamap_create(sc->bge_dmatag, sizeof(struct bge_ring_data), 1,
	    sizeof(struct bge_ring_data), 0,
	    BUS_DMA_NOWAIT, &sc->bge_ring_map)) {
		printf(": can't create dma map\n");
		goto fail_4;
	}
	DPRINTFN(5, ("bus_dmamem_load\n"));
	if (bus_dmamap_load(sc->bge_dmatag, sc->bge_ring_map, kva,
			    sizeof(struct bge_ring_data), NULL,
			    BUS_DMA_NOWAIT)) {
		goto fail_5;
	}

	DPRINTFN(5, ("bzero\n"));
	sc->bge_rdata = (struct bge_ring_data *)kva;

	bzero(sc->bge_rdata, sizeof(struct bge_ring_data));

	/*
	 * Try to allocate memory for Jumbo buffers.
	 */
	if (BGE_IS_JUMBO_CAPABLE(sc)) {
		if (bge_alloc_jumbo_mem(sc)) {
			printf(": jumbo buffer allocation failed\n");
			goto fail_5;
		}
	}

	/* Set default tuneable values. */
	sc->bge_stat_ticks = BGE_TICKS_PER_SEC;
	sc->bge_rx_coal_ticks = 150;
	sc->bge_rx_max_coal_bds = 64;
	sc->bge_tx_coal_ticks = 300;
	sc->bge_tx_max_coal_bds = 400;

	/* 5705 limits RX return ring to 512 entries. */
	if (BGE_IS_5705_OR_BEYOND(sc))
		sc->bge_return_ring_cnt = BGE_RETURN_RING_CNT_5705;
	else
		sc->bge_return_ring_cnt = BGE_RETURN_RING_CNT;

	/* Set up ifnet structure */
	ifp = &sc->arpcom.ac_if;
	ifp->if_softc = sc;
	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
	ifp->if_ioctl = bge_ioctl;
	ifp->if_start = bge_start;
	ifp->if_watchdog = bge_watchdog;
	ifp->if_baudrate = 1000000000;
	IFQ_SET_MAXLEN(&ifp->if_snd, BGE_TX_RING_CNT - 1);
	IFQ_SET_READY(&ifp->if_snd);
	DPRINTFN(5, ("bcopy\n"));
	bcopy(sc->bge_dev.dv_xname, ifp->if_xname, IFNAMSIZ);

	ifp->if_capabilities = IFCAP_VLAN_MTU;

	if (BGE_IS_JUMBO_CAPABLE(sc))
		ifp->if_hardmtu = BGE_JUMBO_MTU;

	/*
	 * Do MII setup.
	 */
	DPRINTFN(5, ("mii setup\n"));
	sc->bge_mii.mii_ifp = ifp;
	sc->bge_mii.mii_readreg = bge_miibus_readreg;
	sc->bge_mii.mii_writereg = bge_miibus_writereg;
	sc->bge_mii.mii_statchg = bge_miibus_statchg;

	/*
	 * Figure out what sort of media we have by checking the hardware
	 * config word in the first 32K of internal NIC memory, or fall back to
	 * examining the EEPROM if necessary.  Note: on some BCM5700 cards,
	 * this value seems to be unset. If that's the case, we have to rely on
	 * identifying the NIC by its PCI subsystem ID, as we do below for the
	 * SysKonnect SK-9D41.
	 */
	if (bge_readmem_ind(sc, BGE_SOFTWARE_GENCOMM_SIG) == BGE_MAGIC_NUMBER)
		hwcfg = bge_readmem_ind(sc, BGE_SOFTWARE_GENCOMM_NICCFG);
	else {
		if (bge_read_eeprom(sc, (caddr_t)&hwcfg, BGE_EE_HWCFG_OFFSET,
		    sizeof(hwcfg))) {
			printf(": failed to read media type\n");
			goto fail_5;
		}
		hwcfg = ntohl(hwcfg);
	}
	
	if ((hwcfg & BGE_HWCFG_MEDIA) == BGE_MEDIA_FIBER)	    
		sc->bge_tbi = 1;

	/* The SysKonnect SK-9D41 is a 1000baseSX card. */
	if ((pci_conf_read(pc, pa->pa_tag, BGE_PCI_SUBSYS) >> 16) ==
	    SK_SUBSYSID_9D41)
		sc->bge_tbi = 1;

	if (sc->bge_tbi) {
		ifmedia_init(&sc->bge_ifmedia, IFM_IMASK, bge_ifmedia_upd,
		    bge_ifmedia_sts);
		ifmedia_add(&sc->bge_ifmedia, IFM_ETHER|IFM_1000_SX, 0, NULL);
		ifmedia_add(&sc->bge_ifmedia, IFM_ETHER|IFM_1000_SX|IFM_FDX,
			    0, NULL);
		ifmedia_add(&sc->bge_ifmedia, IFM_ETHER|IFM_AUTO, 0, NULL);
		ifmedia_set(&sc->bge_ifmedia, IFM_ETHER|IFM_AUTO);
		sc->bge_ifmedia.ifm_media = sc->bge_ifmedia.ifm_cur->ifm_media;
	} else {
		/*
		 * Do transceiver setup.
		 */
		ifmedia_init(&sc->bge_mii.mii_media, 0, bge_ifmedia_upd,
			     bge_ifmedia_sts);
		mii_attach(&sc->bge_dev, &sc->bge_mii, 0xffffffff,
			   MII_PHY_ANY, MII_OFFSET_ANY, 0);
		
		if (LIST_FIRST(&sc->bge_mii.mii_phys) == NULL) {
			printf("%s: no PHY found!\n", sc->bge_dev.dv_xname);
			ifmedia_add(&sc->bge_mii.mii_media,
				    IFM_ETHER|IFM_MANUAL, 0, NULL);
			ifmedia_set(&sc->bge_mii.mii_media,
				    IFM_ETHER|IFM_MANUAL);
		} else
			ifmedia_set(&sc->bge_mii.mii_media,
				    IFM_ETHER|IFM_AUTO);
	}

	/*
	 * When using the BCM5701 in PCI-X mode, data corruption has
	 * been observed in the first few bytes of some received packets.
	 * Aligning the packet buffer in memory eliminates the corruption.
	 * Unfortunately, this misaligns the packet payloads.  On platforms
	 * which do not support unaligned accesses, we will realign the
	 * payloads by copying the received packets.
	 */
	if (BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5701 && sc->bge_pcix)
		sc->bge_rx_alignment_bug = 1;

	/*
	 * Call MI attach routine.
	 */
	if_attach(ifp);
	ether_ifattach(ifp);

	sc->sc_shutdownhook = shutdownhook_establish(bge_shutdown, sc);
	sc->sc_powerhook = powerhook_establish(bge_power, sc);	
	
	timeout_set(&sc->bge_timeout, bge_tick, sc);
	return;

fail_5:
	bus_dmamap_destroy(sc->bge_dmatag, sc->bge_ring_map);

fail_4:
	bus_dmamem_unmap(sc->bge_dmatag, kva,
	    sizeof(struct bge_ring_data));

fail_3:
	bus_dmamem_free(sc->bge_dmatag, &seg, rseg);

fail_2:
	pci_intr_disestablish(pc, sc->bge_intrhand);

fail_1:
	bus_space_unmap(sc->bge_btag, sc->bge_bhandle, size);
}

void
bge_reset(struct bge_softc *sc)
{
	struct pci_attach_args *pa = &sc->bge_pa;
	pcireg_t cachesize, command, pcistate, new_pcistate;
	u_int32_t reset;
	int i, val = 0;

	/* Save some important PCI state. */
	cachesize = pci_conf_read(pa->pa_pc, pa->pa_tag, BGE_PCI_CACHESZ);
	command = pci_conf_read(pa->pa_pc, pa->pa_tag, BGE_PCI_CMD);
	pcistate = pci_conf_read(pa->pa_pc, pa->pa_tag, BGE_PCI_PCISTATE);

	pci_conf_write(pa->pa_pc, pa->pa_tag, BGE_PCI_MISC_CTL,
	    BGE_PCIMISCCTL_INDIRECT_ACCESS|BGE_PCIMISCCTL_MASK_PCI_INTR|
	    BGE_PCIMISCCTL_ENDIAN_WORDSWAP|BGE_PCIMISCCTL_PCISTATE_RW);

	reset = BGE_MISCCFG_RESET_CORE_CLOCKS|(65<<1);

	if (sc->bge_pcie) {
		if (CSR_READ_4(sc, 0x7e2c) == 0x60)	/* PCI-E 1.0 system */
			CSR_WRITE_4(sc, 0x7e2c, 0x20);
		if (sc->bge_chipid != BGE_CHIPID_BCM5750_A0) {
			/* Prevent PCI-E link training during global reset */
			CSR_WRITE_4(sc, BGE_MISC_CFG, (1<<29));
			reset |= (1<<29);
		}
	}

	/* Issue global reset */
	bge_writereg_ind(sc, BGE_MISC_CFG, reset);

	DELAY(1000);

	if (sc->bge_pcie) {
		if (sc->bge_chipid == BGE_CHIPID_BCM5750_A0) {
			pcireg_t v;

			DELAY(500000); /* wait for link training to complete */
			v = pci_conf_read(pa->pa_pc, pa->pa_tag, 0xc4);
			pci_conf_write(pa->pa_pc, pa->pa_tag, 0xc4, v | (1<<15));
		}
		/* Set PCI-E max payload size and clear error status. */
		pci_conf_write(pa->pa_pc, pa->pa_tag,
		    BGE_PCI_CONF_DEV_CTRL, 0xf5000);
	}

	/* Reset some of the PCI state that got zapped by reset */
	pci_conf_write(pa->pa_pc, pa->pa_tag, BGE_PCI_MISC_CTL,
	    BGE_PCIMISCCTL_INDIRECT_ACCESS|BGE_PCIMISCCTL_MASK_PCI_INTR|
	    BGE_PCIMISCCTL_ENDIAN_WORDSWAP|BGE_PCIMISCCTL_PCISTATE_RW);
	pci_conf_write(pa->pa_pc, pa->pa_tag, BGE_PCI_CACHESZ, cachesize);
	pci_conf_write(pa->pa_pc, pa->pa_tag, BGE_PCI_CMD, command);
	bge_writereg_ind(sc, BGE_MISC_CFG, (65 << 1));

	/* Enable memory arbiter. */
	if (BGE_IS_5714_FAMILY(sc)) {
		u_int32_t val;

		val = CSR_READ_4(sc, BGE_MARB_MODE);
		CSR_WRITE_4(sc, BGE_MARB_MODE, BGE_MARBMODE_ENABLE | val);
	} else
		CSR_WRITE_4(sc, BGE_MARB_MODE, BGE_MARBMODE_ENABLE);

	/*
	 * Prevent PXE restart: write a magic number to the
	 * general communications memory at 0xB50.
	 */
	bge_writemem_ind(sc, BGE_SOFTWARE_GENCOMM, BGE_MAGIC_NUMBER);

	/*
	 * Poll the value location we just wrote until
	 * we see the 1's complement of the magic number.
	 * This indicates that the firmware initialization
	 * is complete.
	 */
	for (i = 0; i < BGE_TIMEOUT; i++) {
		val = bge_readmem_ind(sc, BGE_SOFTWARE_GENCOMM);
		if (val == ~BGE_MAGIC_NUMBER)
			break;
		DELAY(10);
	}

	if (i >= BGE_TIMEOUT) {
		printf("%s: firmware handshake timed out\n",
		    sc->bge_dev.dv_xname);
		return;
	}

	/*
	 * XXX Wait for the value of the PCISTATE register to
	 * return to its original pre-reset state. This is a
	 * fairly good indicator of reset completion. If we don't
	 * wait for the reset to fully complete, trying to read
	 * from the device's non-PCI registers may yield garbage
	 * results.
	 */
	for (i = 0; i < BGE_TIMEOUT; i++) {
		new_pcistate = pci_conf_read(pa->pa_pc, pa->pa_tag,
		    BGE_PCI_PCISTATE);
		if ((new_pcistate & ~BGE_PCISTATE_RESERVED) ==
		    (pcistate & ~BGE_PCISTATE_RESERVED))
			break;
		DELAY(10);
	}
	if ((new_pcistate & ~BGE_PCISTATE_RESERVED) != 
	    (pcistate & ~BGE_PCISTATE_RESERVED)) {
		DPRINTFN(5, ("%s: pcistate failed to revert\n",
		    sc->bge_dev.dv_xname));
	}

	/* Fix up byte swapping */
	CSR_WRITE_4(sc, BGE_MODE_CTL, BGE_DMA_SWAP_OPTIONS);

	CSR_WRITE_4(sc, BGE_MAC_MODE, 0);

	/*
	 * The 5704 in TBI mode apparently needs some special
	 * adjustment to insure the SERDES drive level is set
	 * to 1.2V.
	 */
	if (sc->bge_tbi && BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5704) {
		u_int32_t serdescfg;

		serdescfg = CSR_READ_4(sc, BGE_SERDES_CFG);
		serdescfg = (serdescfg & ~0xFFF) | 0x880;
		CSR_WRITE_4(sc, BGE_SERDES_CFG, serdescfg);
	}

	if (sc->bge_pcie && sc->bge_chipid != BGE_CHIPID_BCM5750_A0) {
		u_int32_t v;

		/* Enable PCI-E bug fix */
		v = CSR_READ_4(sc, 0x7c00);
		CSR_WRITE_4(sc, 0x7c00, v | (1<<25));
	}
	DELAY(10000);
}

/*
 * Frame reception handling. This is called if there's a frame
 * on the receive return list.
 *
 * Note: we have to be able to handle two possibilities here:
 * 1) the frame is from the Jumbo receive ring
 * 2) the frame is from the standard receive ring
 */

void
bge_rxeof(struct bge_softc *sc)
{
	struct ifnet *ifp;
	int stdcnt = 0, jumbocnt = 0;
	bus_dmamap_t dmamap;
	bus_addr_t offset, toff;
	bus_size_t tlen;
	int tosync;

	/* Nothing to do */
	if (sc->bge_rx_saved_considx ==
	    sc->bge_rdata->bge_status_block.bge_idx[0].bge_rx_prod_idx)
		return;

	ifp = &sc->arpcom.ac_if;

	bus_dmamap_sync(sc->bge_dmatag, sc->bge_ring_map,
	    offsetof(struct bge_ring_data, bge_status_block),
	    sizeof (struct bge_status_block),
	    BUS_DMASYNC_POSTREAD);

	offset = offsetof(struct bge_ring_data, bge_rx_return_ring);
	tosync = sc->bge_rdata->bge_status_block.bge_idx[0].bge_rx_prod_idx -
	    sc->bge_rx_saved_considx;

	toff = offset + (sc->bge_rx_saved_considx * sizeof (struct bge_rx_bd));

	if (tosync < 0) {
		tlen = (sc->bge_return_ring_cnt - sc->bge_rx_saved_considx) *
		    sizeof (struct bge_rx_bd);
		bus_dmamap_sync(sc->bge_dmatag, sc->bge_ring_map,
		    toff, tlen, BUS_DMASYNC_POSTREAD);
		tosync = -tosync;
	}

	bus_dmamap_sync(sc->bge_dmatag, sc->bge_ring_map,
	    offset, tosync * sizeof (struct bge_rx_bd),
	    BUS_DMASYNC_POSTREAD);

	while(sc->bge_rx_saved_considx !=
	    sc->bge_rdata->bge_status_block.bge_idx[0].bge_rx_prod_idx) {
		struct bge_rx_bd	*cur_rx;
		u_int32_t		rxidx;
		struct mbuf		*m = NULL;
#ifdef BGE_CHECKSUM
		int			sumflags = 0;
#endif

		cur_rx = &sc->bge_rdata->
			bge_rx_return_ring[sc->bge_rx_saved_considx];

		rxidx = cur_rx->bge_idx;
		BGE_INC(sc->bge_rx_saved_considx, sc->bge_return_ring_cnt);

		if (cur_rx->bge_flags & BGE_RXBDFLAG_JUMBO_RING) {
			BGE_INC(sc->bge_jumbo, BGE_JUMBO_RX_RING_CNT);
			m = sc->bge_cdata.bge_rx_jumbo_chain[rxidx];
			sc->bge_cdata.bge_rx_jumbo_chain[rxidx] = NULL;
			jumbocnt++;
			if (cur_rx->bge_flags & BGE_RXBDFLAG_ERROR) {
				ifp->if_ierrors++;
				bge_newbuf_jumbo(sc, sc->bge_jumbo, m);
				continue;
			}
			if (bge_newbuf_jumbo(sc, sc->bge_jumbo, NULL)
			    == ENOBUFS) {
				struct mbuf             *m0;
				m0 = m_devget(mtod(m, char *) - ETHER_ALIGN,
				    cur_rx->bge_len - ETHER_CRC_LEN +
				    ETHER_ALIGN, 0, ifp, NULL);
				bge_newbuf_jumbo(sc, sc->bge_jumbo, m);
				if (m0 == NULL) {
					ifp->if_ierrors++;
					continue;
				}
				m_adj(m0, ETHER_ALIGN);
				m = m0;
			}
		} else {
			BGE_INC(sc->bge_std, BGE_STD_RX_RING_CNT);
			m = sc->bge_cdata.bge_rx_std_chain[rxidx];
			sc->bge_cdata.bge_rx_std_chain[rxidx] = NULL;
			stdcnt++;
			dmamap = sc->bge_cdata.bge_rx_std_map[rxidx];
			sc->bge_cdata.bge_rx_std_map[rxidx] = 0;
			bus_dmamap_unload(sc->bge_dmatag, dmamap);
			if (cur_rx->bge_flags & BGE_RXBDFLAG_ERROR) {
				ifp->if_ierrors++;
				bge_newbuf_std(sc, sc->bge_std, m, dmamap);
				continue;
			}
			if (bge_newbuf_std(sc, sc->bge_std,
			    NULL, dmamap) == ENOBUFS) {
				ifp->if_ierrors++;
				bge_newbuf_std(sc, sc->bge_std, m, dmamap);
				continue;
			}
		}

		ifp->if_ipackets++;
#ifdef __STRICT_ALIGNMENT
		/*
		 * The i386 allows unaligned accesses, but for other
		 * platforms we must make sure the payload is aligned.
		 */
		if (sc->bge_rx_alignment_bug) {
			bcopy(m->m_data, m->m_data + ETHER_ALIGN,
			    cur_rx->bge_len);
			m->m_data += ETHER_ALIGN;
		}
#endif
		m->m_pkthdr.len = m->m_len = cur_rx->bge_len - ETHER_CRC_LEN; 
		m->m_pkthdr.rcvif = ifp;

#if NBPFILTER > 0
		/*
		 * Handle BPF listeners. Let the BPF user see the packet.
		 */
		if (ifp->if_bpf)
			bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_IN);
#endif

#ifdef BGE_CHECKSUM
		if ((cur_rx->bge_ip_csum ^ 0xffff) == 0)
			sumflags |= M_IPV4_CSUM_IN_OK;
		else
			sumflags |= M_IPV4_CSUM_IN_BAD;
#if 0
		if (cur_rx->bge_flags & BGE_RXBDFLAG_TCP_UDP_CSUM) {
			m->m_pkthdr.csum_data =
				cur_rx->bge_tcp_udp_csum;
			m->m_pkthdr.csum_flags |= CSUM_DATA_VALID;
		}
#endif
		m->m_pkthdr.csum_flags = sumflags;
		sumflags = 0;
#endif
		ether_input_mbuf(ifp, m);
	}

	CSR_WRITE_4(sc, BGE_MBX_RX_CONS0_LO, sc->bge_rx_saved_considx);
	if (stdcnt)
		CSR_WRITE_4(sc, BGE_MBX_RX_STD_PROD_LO, sc->bge_std);
	if (jumbocnt)
		CSR_WRITE_4(sc, BGE_MBX_RX_JUMBO_PROD_LO, sc->bge_jumbo);
}

void
bge_txeof(struct bge_softc *sc)
{
	struct bge_tx_bd *cur_tx = NULL;
	struct ifnet *ifp;
	struct txdmamap_pool_entry *dma;
	bus_addr_t offset, toff;
	bus_size_t tlen;
	int tosync;
	struct mbuf *m;

	/* Nothing to do */
	if (sc->bge_tx_saved_considx ==
	    sc->bge_rdata->bge_status_block.bge_idx[0].bge_tx_cons_idx)
		return;

	ifp = &sc->arpcom.ac_if;

	bus_dmamap_sync(sc->bge_dmatag, sc->bge_ring_map,
	    offsetof(struct bge_ring_data, bge_status_block),
	    sizeof (struct bge_status_block),
	    BUS_DMASYNC_POSTREAD);

	offset = offsetof(struct bge_ring_data, bge_tx_ring);
	tosync = sc->bge_rdata->bge_status_block.bge_idx[0].bge_tx_cons_idx -
	    sc->bge_tx_saved_considx;

	toff = offset + (sc->bge_tx_saved_considx * sizeof (struct bge_tx_bd));

	if (tosync < 0) {
		tlen = (BGE_TX_RING_CNT - sc->bge_tx_saved_considx) *
		    sizeof (struct bge_tx_bd);
		bus_dmamap_sync(sc->bge_dmatag, sc->bge_ring_map,
		    toff, tlen, BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);
		tosync = -tosync;
	}

	bus_dmamap_sync(sc->bge_dmatag, sc->bge_ring_map,
	    offset, tosync * sizeof (struct bge_tx_bd),
	    BUS_DMASYNC_POSTREAD|BUS_DMASYNC_POSTWRITE);

	/*
	 * Go through our tx ring and free mbufs for those
	 * frames that have been sent.
	 */
	while (sc->bge_tx_saved_considx !=
	    sc->bge_rdata->bge_status_block.bge_idx[0].bge_tx_cons_idx) {
		u_int32_t		idx = 0;

		idx = sc->bge_tx_saved_considx;
		cur_tx = &sc->bge_rdata->bge_tx_ring[idx];
		if (cur_tx->bge_flags & BGE_TXBDFLAG_END)
			ifp->if_opackets++;
		m = sc->bge_cdata.bge_tx_chain[idx];
		if (m != NULL) {
			sc->bge_cdata.bge_tx_chain[idx] = NULL;
			dma = sc->txdma[idx];
			bus_dmamap_sync(sc->bge_dmatag, dma->dmamap, 0,
			    dma->dmamap->dm_mapsize, BUS_DMASYNC_POSTWRITE);
			bus_dmamap_unload(sc->bge_dmatag, dma->dmamap);
			SLIST_INSERT_HEAD(&sc->txdma_list, dma, link);
			sc->txdma[idx] = NULL;

			m_freem(m);
		}
		sc->bge_txcnt--;
		BGE_INC(sc->bge_tx_saved_considx, BGE_TX_RING_CNT);
		ifp->if_timer = 0;
	}

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

int
bge_intr(void *xsc)
{
	struct bge_softc *sc;
	struct ifnet *ifp;
	u_int32_t statusword;

	sc = xsc;
	ifp = &sc->arpcom.ac_if;

	/* It is possible for the interrupt to arrive before
	 * the status block is updated prior to the interrupt.
	 * Reading the PCI State register will confirm whether the
	 * interrupt is ours and will flush the status block.
	 */

	/* read status word from status block */
	statusword = sc->bge_rdata->bge_status_block.bge_status;

	if ((statusword & BGE_STATFLAG_UPDATED) ||
	    (!(CSR_READ_4(sc, BGE_PCI_PCISTATE) & BGE_PCISTATE_INTR_NOT_ACTIVE))) {

		/* Ack interrupt and stop others from occurring. */
		CSR_WRITE_4(sc, BGE_MBX_IRQ0_LO, 1);
			
		/* clear status word */
		sc->bge_rdata->bge_status_block.bge_status = 0;

		if ((BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5700 &&
		    sc->bge_chipid != BGE_CHIPID_BCM5700_B1) ||
		    statusword & BGE_STATFLAG_LINKSTATE_CHANGED ||
		    sc->bge_link_evt)
			bge_link_upd(sc);

		if (ifp->if_flags & IFF_RUNNING) {
			/* Check RX return ring producer/consumer */
			bge_rxeof(sc);

			/* Check TX ring producer/consumer */
			bge_txeof(sc);
		}

		/* Re-enable interrupts. */
		CSR_WRITE_4(sc, BGE_MBX_IRQ0_LO, 0);

		if (ifp->if_flags & IFF_RUNNING && !IFQ_IS_EMPTY(&ifp->if_snd))
			bge_start(ifp);

		return (1);
	} else
		return (0);
}

void
bge_tick(void *xsc)
{
	struct bge_softc *sc = xsc;
	struct mii_data *mii = &sc->bge_mii;
	int s;

	s = splnet();

	if (BGE_IS_5705_OR_BEYOND(sc))
		bge_stats_update_regs(sc);
	else
		bge_stats_update(sc);

	if (!sc->bge_tbi) {
		mii_tick(mii);
	} else {
		/*
		 * Since in TBI mode auto-polling can't be used we should poll
		 * link status manually. Here we register pending link event
		 * and trigger interrupt.
		 */
		sc->bge_link_evt++;
		BGE_SETBIT(sc, BGE_MISC_LOCAL_CTL, BGE_MLC_INTR_SET);
	}

	timeout_add(&sc->bge_timeout, hz);

	splx(s);
}

void
bge_stats_update_regs(struct bge_softc *sc)
{
	struct ifnet *ifp;
	struct bge_mac_stats_regs stats;
	u_int32_t *s;
	u_long cnt;
	int i;

	ifp = &sc->arpcom.ac_if;

	s = (u_int32_t *)&stats;
	for (i = 0; i < sizeof(struct bge_mac_stats_regs); i += 4) {
		*s = CSR_READ_4(sc, BGE_RX_STATS + i);
		s++;
	}

	cnt = stats.dot3StatsSingleCollisionFrames +
	    stats.dot3StatsMultipleCollisionFrames +
	    stats.dot3StatsExcessiveCollisions +
	    stats.dot3StatsLateCollisions;
	ifp->if_collisions += cnt >= sc->bge_tx_collisions ?
	    cnt - sc->bge_tx_collisions : cnt;
	sc->bge_tx_collisions = cnt;
}

void
bge_stats_update(struct bge_softc *sc)
{
	struct ifnet *ifp = &sc->arpcom.ac_if;
	bus_size_t stats = BGE_MEMWIN_START + BGE_STATS_BLOCK;
	u_long cnt;

#define READ_STAT(sc, stats, stat) \
	  CSR_READ_4(sc, stats + offsetof(struct bge_stats, stat))

	cnt = READ_STAT(sc, stats,
	    txstats.dot3StatsSingleCollisionFrames.bge_addr_lo);
	cnt += READ_STAT(sc, stats,
	    txstats.dot3StatsMultipleCollisionFrames.bge_addr_lo);
	cnt += READ_STAT(sc, stats,
	    txstats.dot3StatsExcessiveCollisions.bge_addr_lo);
	cnt += READ_STAT(sc, stats,
		txstats.dot3StatsLateCollisions.bge_addr_lo);
	ifp->if_collisions += cnt >= sc->bge_tx_collisions ?
	    cnt - sc->bge_tx_collisions : cnt;
	sc->bge_tx_collisions = cnt;

	cnt = READ_STAT(sc, stats, ifInDiscards.bge_addr_lo);
	ifp->if_ierrors += cnt >= sc->bge_rx_discards ?
	    cnt - sc->bge_rx_discards : cnt;
	sc->bge_rx_discards = cnt;

	cnt = READ_STAT(sc, stats, txstats.ifOutDiscards.bge_addr_lo);
	ifp->if_oerrors += cnt >= sc->bge_tx_discards ?
	    cnt - sc->bge_tx_discards : cnt;
	sc->bge_tx_discards = cnt;

#undef READ_STAT
}

/*
 * Compact outbound packets to avoid bug with DMA segments less than 8 bytes.
 */
int
bge_compact_dma_runt(struct mbuf *pkt)
{
	struct mbuf	*m, *prev;
	int 		totlen, prevlen;

	prev = NULL;
	totlen = 0;
	prevlen = -1;

	for (m = pkt; m != NULL; prev = m,m = m->m_next) {
		int mlen = m->m_len;
		int shortfall = 8 - mlen ;

		totlen += mlen;
		if (mlen == 0)
			continue;
		if (mlen >= 8)
			continue;

		/* If we get here, mbuf data is too small for DMA engine.
		 * Try to fix by shuffling data to prev or next in chain.
		 * If that fails, do a compacting deep-copy of the whole chain.
		 */

		/* Internal frag. If fits in prev, copy it there. */
		if (prev && !M_READONLY(prev) &&
		    M_TRAILINGSPACE(prev) >= m->m_len) {
			bcopy(m->m_data,
			      prev->m_data+prev->m_len,
			      mlen);
			prev->m_len += mlen;
			m->m_len = 0;
			/* XXX stitch chain */
			prev->m_next = m_free(m);
			m = prev;
			continue;
		} else if (m->m_next != NULL && !M_READONLY(m) &&
			   M_TRAILINGSPACE(m) >= shortfall &&
			   m->m_next->m_len >= (8 + shortfall)) {
			/* m is writable and have enough data in next, pull up. */

			bcopy(m->m_next->m_data,
			      m->m_data+m->m_len,
			      shortfall);
			m->m_len += shortfall;
			m->m_next->m_len -= shortfall;
			m->m_next->m_data += shortfall;
		} else if (m->m_next == NULL || 1) {
			/* Got a runt at the very end of the packet.
			 * borrow data from the tail of the preceding mbuf and
			 * update its length in-place. (The original data is still
			 * valid, so we can do this even if prev is not writable.)
			 */

			/* if we'd make prev a runt, just move all of its data. */
#ifdef DEBUG
			KASSERT(prev != NULL /*, ("runt but null PREV")*/);
			KASSERT(prev->m_len >= 8 /*, ("runt prev")*/);
#endif
			if ((prev->m_len - shortfall) < 8)
				shortfall = prev->m_len;

#ifdef notyet	/* just do the safe slow thing for now */
			if (!M_READONLY(m)) {
				if (M_LEADINGSPACE(m) < shorfall) {
					void *m_dat;

					m_dat = (m->m_flags & M_PKTHDR) ?
					    m->m_pktdat : m->dat;
					memmove(m_dat, mtod(m, void*), m->m_len);
					m->m_data = m_dat;
				}
			} else
#endif	/* just do the safe slow thing */
			{
				struct mbuf * n = NULL;
				int newprevlen = prev->m_len - shortfall;

				MGET(n, M_NOWAIT, MT_DATA);
				if (n == NULL)
					return (ENOBUFS);
				KASSERT(m->m_len + shortfall < MLEN
					/*,
					  ("runt %d +prev %d too big\n", m->m_len, shortfall)*/);

				/* first copy the data we're stealing from prev */
				bcopy(prev->m_data + newprevlen, n->m_data, shortfall);

				/* update prev->m_len accordingly */
				prev->m_len -= shortfall;

				/* copy data from runt m */
				bcopy(m->m_data, n->m_data + shortfall, m->m_len);

				/* n holds what we stole from prev, plus m */
				n->m_len = shortfall + m->m_len;

				/* stitch n into chain and free m */
				n->m_next = m->m_next;
				prev->m_next = n;
				/* KASSERT(m->m_next == NULL); */
				m->m_next = NULL;
				m_free(m);
				m = n;	/* for continuing loop */
			}
		}
		prevlen = m->m_len;
	}
	return (0);
}

/*
 * Encapsulate an mbuf chain in the tx ring by coupling the mbuf data
 * pointers to descriptors.
 */
int
bge_encap(struct bge_softc *sc, struct mbuf *m_head, u_int32_t *txidx)
{
	struct bge_tx_bd	*f = NULL;
	u_int32_t		frag, cur, cnt = 0;
	u_int16_t		csum_flags = 0;
	struct txdmamap_pool_entry *dma;
	bus_dmamap_t dmamap;
	int			i = 0;
#if NVLAN > 0
	struct ifvlan		*ifv = NULL;

	if ((m_head->m_flags & (M_PROTO1|M_PKTHDR)) == (M_PROTO1|M_PKTHDR) &&
	    m_head->m_pkthdr.rcvif != NULL)
		ifv = m_head->m_pkthdr.rcvif->if_softc;
#endif

	cur = frag = *txidx;

#ifdef BGE_CHECKSUM
	if (m_head->m_pkthdr.csum_flags) {
		if (m_head->m_pkthdr.csum_flags & M_IPV4_CSUM_OUT)
			csum_flags |= BGE_TXBDFLAG_IP_CSUM;
		if (m_head->m_pkthdr.csum_flags & (M_TCPV4_CSUM_OUT |
					     M_UDPV4_CSUM_OUT))
			csum_flags |= BGE_TXBDFLAG_TCP_UDP_CSUM;
#ifdef fake
		if (m_head->m_flags & M_LASTFRAG)
			csum_flags |= BGE_TXBDFLAG_IP_FRAG_END;
		else if (m_head->m_flags & M_FRAG)
			csum_flags |= BGE_TXBDFLAG_IP_FRAG;
#endif
	}
#endif
	if (!(BGE_CHIPREV(sc->bge_chipid) == BGE_CHIPREV_5700_BX))
		goto doit;
	/*
	 * bcm5700 Revision B silicon cannot handle DMA descriptors with
	 * less than eight bytes.  If we encounter a teeny mbuf
	 * at the end of a chain, we can pad.  Otherwise, copy.
	 */
	if (bge_compact_dma_runt(m_head) != 0)
		return (ENOBUFS);
doit:
	dma = SLIST_FIRST(&sc->txdma_list);
	if (dma == NULL)
		return (ENOBUFS);
	dmamap = dma->dmamap;

	/*
	 * 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.
	 */
	if (bus_dmamap_load_mbuf(sc->bge_dmatag, dmamap, m_head,
	    BUS_DMA_NOWAIT))
		return (ENOBUFS);

	for (i = 0; i < dmamap->dm_nsegs; i++) {
		f = &sc->bge_rdata->bge_tx_ring[frag];
		if (sc->bge_cdata.bge_tx_chain[frag] != NULL)
			break;
		BGE_HOSTADDR(f->bge_addr, dmamap->dm_segs[i].ds_addr);
		f->bge_len = dmamap->dm_segs[i].ds_len;
		f->bge_flags = csum_flags;
#if NVLAN > 0
		if (ifv != NULL) {
			f->bge_flags |= BGE_TXBDFLAG_VLAN_TAG;
			f->bge_vlan_tag = ifv->ifv_tag;
		} else {
			f->bge_vlan_tag = 0;
		}
#endif
		/*
		 * Sanity check: avoid coming within 16 descriptors
		 * of the end of the ring.
		 */
		if ((BGE_TX_RING_CNT - (sc->bge_txcnt + cnt)) < 16)
			return (ENOBUFS);
		cur = frag;
		BGE_INC(frag, BGE_TX_RING_CNT);
		cnt++;
	}

	if (i < dmamap->dm_nsegs)
		return (ENOBUFS);

	bus_dmamap_sync(sc->bge_dmatag, dmamap, 0, dmamap->dm_mapsize,
	    BUS_DMASYNC_PREWRITE);

	if (frag == sc->bge_tx_saved_considx)
		return (ENOBUFS);

	sc->bge_rdata->bge_tx_ring[cur].bge_flags |= BGE_TXBDFLAG_END;
	sc->bge_cdata.bge_tx_chain[cur] = m_head;
	SLIST_REMOVE_HEAD(&sc->txdma_list, link);
	sc->txdma[cur] = dma;
	sc->bge_txcnt += 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 descriptors.
 */
void
bge_start(struct ifnet *ifp)
{
	struct bge_softc *sc;
	struct mbuf *m_head = NULL;
	u_int32_t prodidx;
	int pkts = 0;

	sc = ifp->if_softc;

	if (!sc->bge_link && ifp->if_snd.ifq_len < 10)
		return;

	prodidx = sc->bge_tx_prodidx;

	while (sc->bge_cdata.bge_tx_chain[prodidx] == NULL) {
		IFQ_POLL(&ifp->if_snd, m_head);
		if (m_head == NULL)
			break;

		/*
		 * XXX
		 * safety overkill.  If this is a fragmented packet chain
		 * with delayed TCP/UDP checksums, then only encapsulate
		 * it if we have enough descriptors to handle the entire
		 * chain at once.
		 * (paranoia -- may not actually be needed)
		 */
#ifdef fake
		if (m_head->m_flags & M_FIRSTFRAG &&
		    m_head->m_pkthdr.csum_flags & (CSUM_DELAY_DATA)) {
			if ((BGE_TX_RING_CNT - sc->bge_txcnt) <
			    m_head->m_pkthdr.csum_data + 16) {
				ifp->if_flags |= IFF_OACTIVE;
				break;
			}
		}
#endif

		/*
		 * Pack the data into the transmit ring. If we
		 * don't have room, set the OACTIVE flag and wait
		 * for the NIC to drain the ring.
		 */
		if (bge_encap(sc, m_head, &prodidx)) {
			ifp->if_flags |= IFF_OACTIVE;
			break;
		}

		/* now we are committed to transmit the packet */
		IFQ_DEQUEUE(&ifp->if_snd, m_head);
		pkts++;

#if NBPFILTER > 0
		/*
		 * If there's a BPF listener, bounce a copy of this frame
		 * to him.
		 */
		if (ifp->if_bpf)
			bpf_mtap(ifp->if_bpf, m_head, BPF_DIRECTION_OUT);
#endif
	}
	if (pkts == 0)
		return;

	/* Transmit */
	CSR_WRITE_4(sc, BGE_MBX_TX_HOST_PROD0_LO, prodidx);
	if (BGE_CHIPREV(sc->bge_chipid) == BGE_CHIPREV_5700_BX)
		CSR_WRITE_4(sc, BGE_MBX_TX_HOST_PROD0_LO, prodidx);

	sc->bge_tx_prodidx = prodidx;

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

void
bge_init(void *xsc)
{
	struct bge_softc *sc = xsc;
	struct ifnet *ifp;
	u_int16_t *m;
	int s;

	s = splnet();

	ifp = &sc->arpcom.ac_if;

	/* Cancel pending I/O and flush buffers. */
	bge_stop(sc);
	bge_reset(sc);
	bge_chipinit(sc);

	/*
	 * Init the various state machines, ring
	 * control blocks and firmware.
	 */
	if (bge_blockinit(sc)) {
		printf("%s: initialization failure\n", sc->bge_dev.dv_xname);
		splx(s);
		return;
	}

	ifp = &sc->arpcom.ac_if;

	/* Specify MRU. */
	if (BGE_IS_JUMBO_CAPABLE(sc))
		CSR_WRITE_4(sc, BGE_RX_MTU,
			BGE_JUMBO_FRAMELEN + ETHER_VLAN_ENCAP_LEN);
	else
		CSR_WRITE_4(sc, BGE_RX_MTU,
			ETHER_MAX_LEN + ETHER_VLAN_ENCAP_LEN);

	/* Load our MAC address. */
	m = (u_int16_t *)&sc->arpcom.ac_enaddr[0];
	CSR_WRITE_4(sc, BGE_MAC_ADDR1_LO, htons(m[0]));
	CSR_WRITE_4(sc, BGE_MAC_ADDR1_HI, (htons(m[1]) << 16) | htons(m[2]));

	/* Enable or disable promiscuous mode as needed. */
	if (ifp->if_flags & IFF_PROMISC)
		BGE_SETBIT(sc, BGE_RX_MODE, BGE_RXMODE_RX_PROMISC);
	else
		BGE_CLRBIT(sc, BGE_RX_MODE, BGE_RXMODE_RX_PROMISC);

	/* Disable hardware decapsulation of vlan frames. */
	BGE_SETBIT(sc, BGE_RX_MODE, BGE_RXMODE_RX_KEEP_VLAN_DIAG);

	/* Program multicast filter. */
	bge_setmulti(sc);

	/* Init RX ring. */
	bge_init_rx_ring_std(sc);

	/*
	 * Workaround for a bug in 5705 ASIC rev A0. Poll the NIC's
	 * memory to insure that the chip has in fact read the first
	 * entry of the ring.
	 */
	if (sc->bge_chipid == BGE_CHIPID_BCM5705_A0) {
		u_int32_t		v, i;
		for (i = 0; i < 10; i++) {
			DELAY(20);
			v = bge_readmem_ind(sc, BGE_STD_RX_RINGS + 8);
			if (v == (MCLBYTES - ETHER_ALIGN))
				break;
		}
		if (i == 10)
			printf("%s: 5705 A0 chip failed to load RX ring\n",
			    sc->bge_dev.dv_xname);
	}

	/* Init Jumbo RX ring. */
	if (BGE_IS_JUMBO_CAPABLE(sc))
		bge_init_rx_ring_jumbo(sc);

	/* Init our RX return ring index */
	sc->bge_rx_saved_considx = 0;

	/* Init TX ring. */
	bge_init_tx_ring(sc);

	/* Turn on transmitter */
	BGE_SETBIT(sc, BGE_TX_MODE, BGE_TXMODE_ENABLE);

	/* Turn on receiver */
	BGE_SETBIT(sc, BGE_RX_MODE, BGE_RXMODE_ENABLE);

	CSR_WRITE_4(sc, BGE_MAX_RX_FRAME_LOWAT, 2);

	/* Tell firmware we're alive. */
	BGE_SETBIT(sc, BGE_MODE_CTL, BGE_MODECTL_STACKUP);

	/* Enable host interrupts. */
	BGE_SETBIT(sc, BGE_PCI_MISC_CTL, BGE_PCIMISCCTL_CLEAR_INTA);
	BGE_CLRBIT(sc, BGE_PCI_MISC_CTL, BGE_PCIMISCCTL_MASK_PCI_INTR);
	CSR_WRITE_4(sc, BGE_MBX_IRQ0_LO, 0);

	bge_ifmedia_upd(ifp);

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

	splx(s);

	timeout_add(&sc->bge_timeout, hz);
}

/*
 * Set media options.
 */
int
bge_ifmedia_upd(struct ifnet *ifp)
{
	struct bge_softc *sc = ifp->if_softc;
	struct mii_data *mii = &sc->bge_mii;
	struct ifmedia *ifm = &sc->bge_ifmedia;

	/* If this is a 1000baseX NIC, enable the TBI port. */
	if (sc->bge_tbi) {
		if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
			return (EINVAL);
		switch(IFM_SUBTYPE(ifm->ifm_media)) {
		case IFM_AUTO:
			/*
			 * The BCM5704 ASIC appears to have a special
			 * mechanism for programming the autoneg
			 * advertisement registers in TBI mode.
			 */
			if (BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5704) {
				u_int32_t sgdig;
				CSR_WRITE_4(sc, BGE_TX_TBI_AUTONEG, 0);
				sgdig = CSR_READ_4(sc, BGE_SGDIG_CFG);
				sgdig |= BGE_SGDIGCFG_AUTO|
				    BGE_SGDIGCFG_PAUSE_CAP|
				    BGE_SGDIGCFG_ASYM_PAUSE;
				CSR_WRITE_4(sc, BGE_SGDIG_CFG,
				    sgdig|BGE_SGDIGCFG_SEND);
				DELAY(5);
				CSR_WRITE_4(sc, BGE_SGDIG_CFG, sgdig);
			}
			break;
		case IFM_1000_SX:
			if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX) {
				BGE_CLRBIT(sc, BGE_MAC_MODE,
				    BGE_MACMODE_HALF_DUPLEX);
			} else {
				BGE_SETBIT(sc, BGE_MAC_MODE,
				    BGE_MACMODE_HALF_DUPLEX);
			}
			break;
		default:
			return (EINVAL);
		}
		return (0);
	}

	sc->bge_link_evt++;
	if (mii->mii_instance) {
		struct mii_softc *miisc;
		for (miisc = LIST_FIRST(&mii->mii_phys); miisc != NULL;
		    miisc = LIST_NEXT(miisc, mii_list))
			mii_phy_reset(miisc);
	}
	mii_mediachg(mii);

	return (0);
}

/*
 * Report current media status.
 */
void
bge_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
{
	struct bge_softc *sc = ifp->if_softc;
	struct mii_data *mii = &sc->bge_mii;

	if (sc->bge_tbi) {
		ifmr->ifm_status = IFM_AVALID;
		ifmr->ifm_active = IFM_ETHER;
		if (CSR_READ_4(sc, BGE_MAC_STS) &
		    BGE_MACSTAT_TBI_PCS_SYNCHED) {
			ifmr->ifm_status |= IFM_ACTIVE;
		} else {
			ifmr->ifm_active |= IFM_NONE;
			return;
		}
		ifmr->ifm_active |= IFM_1000_SX;
		if (CSR_READ_4(sc, BGE_MAC_MODE) & BGE_MACMODE_HALF_DUPLEX)
			ifmr->ifm_active |= IFM_HDX;
		else
			ifmr->ifm_active |= IFM_FDX;
		return;
	}

	mii_pollstat(mii);
	ifmr->ifm_active = mii->mii_media_active;
	ifmr->ifm_status = mii->mii_media_status;
}

int
bge_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
	struct bge_softc *sc = ifp->if_softc;
	struct ifreq *ifr = (struct ifreq *) data;
	struct ifaddr *ifa = (struct ifaddr *)data;
	int s, error = 0;
	struct mii_data *mii;

	s = splnet();

	if ((error = ether_ioctl(ifp, &sc->arpcom, command, data)) > 0) {
		splx(s);
		return (error);
	}

	switch(command) {
	case SIOCSIFADDR:
		ifp->if_flags |= IFF_UP;
		if (!(ifp->if_flags & IFF_RUNNING))
			bge_init(sc);
#ifdef INET
		if (ifa->ifa_addr->sa_family == AF_INET)
			arp_ifinit(&sc->arpcom, ifa);
#endif /* INET */
		break;
	case SIOCSIFMTU:
		if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > ifp->if_hardmtu)
			error = EINVAL;
		else if (ifp->if_mtu != ifr->ifr_mtu)
			ifp->if_mtu = ifr->ifr_mtu;
		break;
	case SIOCSIFFLAGS:
		if (ifp->if_flags & IFF_UP) {
			/*
			 * If only the state of the PROMISC flag changed,
			 * then just use the 'set promisc mode' command
			 * instead of reinitializing the entire NIC. Doing
			 * a full re-init means reloading the firmware and
			 * waiting for it to start up, which may take a
			 * second or two.  Similarly for ALLMULTI.
			 */
			if (ifp->if_flags & IFF_RUNNING &&
			    ifp->if_flags & IFF_PROMISC &&
			    !(sc->bge_if_flags & IFF_PROMISC)) {
				BGE_SETBIT(sc, BGE_RX_MODE,
				    BGE_RXMODE_RX_PROMISC);
				bge_setmulti(sc);
			} else if (ifp->if_flags & IFF_RUNNING &&
			    !(ifp->if_flags & IFF_PROMISC) &&
			    sc->bge_if_flags & IFF_PROMISC) {
				BGE_CLRBIT(sc, BGE_RX_MODE,
				    BGE_RXMODE_RX_PROMISC);
				bge_setmulti(sc);
			} else if (ifp->if_flags & IFF_RUNNING &&
			    (ifp->if_flags ^ sc->bge_if_flags) & IFF_ALLMULTI) {
				bge_setmulti(sc);
			} else {
				if (!(ifp->if_flags & IFF_RUNNING))
					bge_init(sc);
			}
		} else {
			if (ifp->if_flags & IFF_RUNNING)
				bge_stop(sc);
		}
		sc->bge_if_flags = ifp->if_flags;
		break;
	case SIOCADDMULTI:
	case SIOCDELMULTI:
		error = (command == SIOCADDMULTI)
			? ether_addmulti(ifr, &sc->arpcom)
			: ether_delmulti(ifr, &sc->arpcom);

		if (error == ENETRESET) {
			if (ifp->if_flags & IFF_RUNNING)
				bge_setmulti(sc);
			error = 0;
		}
		break;
	case SIOCSIFMEDIA:
	case SIOCGIFMEDIA:
		if (sc->bge_tbi) {
			error = ifmedia_ioctl(ifp, ifr, &sc->bge_ifmedia,
			    command);
		} else {
			mii = &sc->bge_mii;
			error = ifmedia_ioctl(ifp, ifr, &mii->mii_media,
			    command);
		}
		break;
	default:
		error = ENOTTY;
		break;
	}

	splx(s);

	return (error);
}

void
bge_watchdog(struct ifnet *ifp)
{
	struct bge_softc *sc;

	sc = ifp->if_softc;

	printf("%s: watchdog timeout -- resetting\n", sc->bge_dev.dv_xname);

	bge_init(sc);

	ifp->if_oerrors++;
}

void
bge_stop_block(struct bge_softc *sc, bus_size_t reg, u_int32_t bit)
{
	int i;

	BGE_CLRBIT(sc, reg, bit);

	for (i = 0; i < BGE_TIMEOUT; i++) {
		if ((CSR_READ_4(sc, reg) & bit) == 0)
			return;
		delay(100);
	}

	DPRINTFN(5, ("%s: block failed to stop: reg 0x%lx, bit 0x%08x\n",
	    sc->bge_dev.dv_xname, (u_long) reg, bit));
}

/*
 * Stop the adapter and free any mbufs allocated to the
 * RX and TX lists.
 */
void
bge_stop(struct bge_softc *sc)
{
	struct ifnet *ifp = &sc->arpcom.ac_if;
	struct ifmedia_entry *ifm;
	struct mii_data *mii;
	int mtmp, itmp;

	timeout_del(&sc->bge_timeout);

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

	/*
	 * Disable all of the receiver blocks
	 */
	bge_stop_block(sc, BGE_RX_MODE, BGE_RXMODE_ENABLE);
	bge_stop_block(sc, BGE_RBDI_MODE, BGE_RBDIMODE_ENABLE);
	bge_stop_block(sc, BGE_RXLP_MODE, BGE_RXLPMODE_ENABLE);
	if (!(BGE_IS_5705_OR_BEYOND(sc)))
		bge_stop_block(sc, BGE_RXLS_MODE, BGE_RXLSMODE_ENABLE);
	bge_stop_block(sc, BGE_RDBDI_MODE, BGE_RBDIMODE_ENABLE);
	bge_stop_block(sc, BGE_RDC_MODE, BGE_RDCMODE_ENABLE);
	bge_stop_block(sc, BGE_RBDC_MODE, BGE_RBDCMODE_ENABLE);

	/*
	 * Disable all of the transmit blocks
	 */
	bge_stop_block(sc, BGE_SRS_MODE, BGE_SRSMODE_ENABLE);
	bge_stop_block(sc, BGE_SBDI_MODE, BGE_SBDIMODE_ENABLE);
	bge_stop_block(sc, BGE_SDI_MODE, BGE_SDIMODE_ENABLE);
	bge_stop_block(sc, BGE_RDMA_MODE, BGE_RDMAMODE_ENABLE);
	bge_stop_block(sc, BGE_SDC_MODE, BGE_SDCMODE_ENABLE);
	if (!(BGE_IS_5705_OR_BEYOND(sc)))
		bge_stop_block(sc, BGE_DMAC_MODE, BGE_DMACMODE_ENABLE);
	bge_stop_block(sc, BGE_SBDC_MODE, BGE_SBDCMODE_ENABLE);

	/*
	 * Shut down all of the memory managers and related
	 * state machines.
	 */
	bge_stop_block(sc, BGE_HCC_MODE, BGE_HCCMODE_ENABLE);
	bge_stop_block(sc, BGE_WDMA_MODE, BGE_WDMAMODE_ENABLE);
	if (!(BGE_IS_5705_OR_BEYOND(sc)))
		bge_stop_block(sc, BGE_MBCF_MODE, BGE_MBCFMODE_ENABLE);

	CSR_WRITE_4(sc, BGE_FTQ_RESET, 0xFFFFFFFF);
	CSR_WRITE_4(sc, BGE_FTQ_RESET, 0);

	if (!(BGE_IS_5705_OR_BEYOND(sc))) {
		bge_stop_block(sc, BGE_BMAN_MODE, BGE_BMANMODE_ENABLE);
		bge_stop_block(sc, BGE_MARB_MODE, BGE_MARBMODE_ENABLE);
	}

	/* Disable host interrupts. */
	BGE_SETBIT(sc, BGE_PCI_MISC_CTL, BGE_PCIMISCCTL_MASK_PCI_INTR);
	CSR_WRITE_4(sc, BGE_MBX_IRQ0_LO, 1);

	/*
	 * Tell firmware we're shutting down.
	 */
	BGE_CLRBIT(sc, BGE_MODE_CTL, BGE_MODECTL_STACKUP);

	/* Free the RX lists. */
	bge_free_rx_ring_std(sc);

	/* Free jumbo RX list. */
	if (BGE_IS_JUMBO_CAPABLE(sc))
		bge_free_rx_ring_jumbo(sc);

	/* Free TX buffers. */
	bge_free_tx_ring(sc);

	/*
	 * Isolate/power down the PHY, but leave the media selection
	 * unchanged so that things will be put back to normal when
	 * we bring the interface back up.
	 */
	if (!sc->bge_tbi) {
		mii = &sc->bge_mii;
		itmp = ifp->if_flags;
		ifp->if_flags |= IFF_UP;
		ifm = mii->mii_media.ifm_cur;
		mtmp = ifm->ifm_media;
		ifm->ifm_media = IFM_ETHER|IFM_NONE;
		mii_mediachg(mii);
		ifm->ifm_media = mtmp;
		ifp->if_flags = itmp;
	}

	sc->bge_tx_saved_considx = BGE_TXCONS_UNSET;

	/*
	 * We can't just call bge_link_upd() cause chip is almost stopped so
	 * bge_link_upd -> bge_tick_locked -> bge_stats_update sequence may
	 * lead to hardware deadlock. So we just clearing MAC's link state
	 * (PHY may still have link UP).
	 */
	sc->bge_link = 0;
}

/*
 * Stop all chip I/O so that the kernel's probe routines don't
 * get confused by errant DMAs when rebooting.
 */
void
bge_shutdown(void *xsc)
{
	struct bge_softc *sc = (struct bge_softc *)xsc;

	bge_stop(sc);
	bge_reset(sc);
}

void
bge_link_upd(struct bge_softc *sc)
{
	struct ifnet *ifp = &sc->arpcom.ac_if;
	struct mii_data *mii = &sc->bge_mii;
	u_int32_t link, status;

	/* Clear 'pending link event' flag */
	sc->bge_link_evt = 0;

	/*
	 * Process link state changes.
	 * Grrr. The link status word in the status block does
	 * not work correctly on the BCM5700 rev AX and BX chips,
	 * according to all available information. Hence, we have
	 * to enable MII interrupts in order to properly obtain
	 * async link changes. Unfortunately, this also means that
	 * we have to read the MAC status register to detect link
	 * changes, thereby adding an additional register access to
	 * the interrupt handler.
	 *
	 * XXX: perhaps link state detection procedure used for
	 * BGE_CHIPID_BCM5700_B1 can be used for other BCM5700 revisions.
	 */

	if (BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5700 &&
	    sc->bge_chipid != BGE_CHIPID_BCM5700_B1) {
		status = CSR_READ_4(sc, BGE_MAC_STS);
		if (status & BGE_MACSTAT_MI_INTERRUPT) {
			timeout_del(&sc->bge_timeout);
			bge_tick(sc);

			if (!sc->bge_link &&
			    mii->mii_media_status & IFM_ACTIVE &&
			    IFM_SUBTYPE(mii->mii_media_active) != IFM_NONE) {
				sc->bge_link++;
			} else if (sc->bge_link &&
			    (!(mii->mii_media_status & IFM_ACTIVE) ||
			    IFM_SUBTYPE(mii->mii_media_active) == IFM_NONE)) {
				sc->bge_link = 0;
			}

			/* Clear the interrupt */
			CSR_WRITE_4(sc, BGE_MAC_EVT_ENB,
			    BGE_EVTENB_MI_INTERRUPT);
			bge_miibus_readreg(&sc->bge_dev, 1, BRGPHY_MII_ISR);
			bge_miibus_writereg(&sc->bge_dev, 1, BRGPHY_MII_IMR,
			    BRGPHY_INTRS);
		}
		return;
	} 

	if (sc->bge_tbi) {
		status = CSR_READ_4(sc, BGE_MAC_STS);
		if (status & BGE_MACSTAT_TBI_PCS_SYNCHED) {
			if (!sc->bge_link) {
				sc->bge_link++;
				if (BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5704)
					BGE_CLRBIT(sc, BGE_MAC_MODE,
					    BGE_MACMODE_TBI_SEND_CFGS);
				CSR_WRITE_4(sc, BGE_MAC_STS, 0xFFFFFFFF);
				ifp->if_link_state = LINK_STATE_UP;
				if_link_state_change(ifp);
			}
		} else if (sc->bge_link) {
			sc->bge_link = 0;
			ifp->if_link_state = LINK_STATE_DOWN;
			if_link_state_change(ifp);
		}
	/* Discard link events for MII/GMII cards if MI auto-polling disabled */
	} else if (CSR_READ_4(sc, BGE_MI_MODE) & BGE_MIMODE_AUTOPOLL) {
		/* 
		 * Some broken BCM chips have BGE_STATFLAG_LINKSTATE_CHANGED bit
		 * in status word always set. Workaround this bug by reading
		 * PHY link status directly.
		 */
		link = (CSR_READ_4(sc, BGE_MI_STS) & BGE_MISTS_LINK) ? 1 : 0;

		if (link != sc->bge_link ||
		    BGE_ASICREV(sc->bge_chipid) == BGE_ASICREV_BCM5700) {
			timeout_del(&sc->bge_timeout);
			bge_tick(sc);

			if (!sc->bge_link &&
			    mii->mii_media_status & IFM_ACTIVE &&
			    IFM_SUBTYPE(mii->mii_media_active) != IFM_NONE)
				sc->bge_link++;
			else if (sc->bge_link &&
			    (!(mii->mii_media_status & IFM_ACTIVE) ||
			    IFM_SUBTYPE(mii->mii_media_active) == IFM_NONE))
				sc->bge_link = 0;
		}
	}

	/* Clear the attention */
	CSR_WRITE_4(sc, BGE_MAC_STS, BGE_MACSTAT_SYNC_CHANGED|
	    BGE_MACSTAT_CFG_CHANGED|BGE_MACSTAT_MI_COMPLETE|
	    BGE_MACSTAT_LINK_CHANGED);
}

void
bge_power(int why, void *xsc)
{
	struct bge_softc *sc = (struct bge_softc *)xsc;
	struct ifnet *ifp;

	if (why == PWR_RESUME) {
		ifp = &sc->arpcom.ac_if;
		if (ifp->if_flags & IFF_UP) {
			bge_init(xsc);
			if (ifp->if_flags & IFF_RUNNING)
				bge_start(ifp);
		}
	}
}