[dragonfly.git] / sys / dev / netif / txp / if_txp.c

/*      $OpenBSD: if_txp.c,v 1.48 2001/06/27 06:34:50 kjc Exp $ */
/*      $FreeBSD: src/sys/dev/txp/if_txp.c,v 1.4.2.4 2001/12/14 19:50:43 jlemon Exp $ */

/*
 * Copyright (c) 2001
 *      Jason L. Wright <jason@thought.net>, Theo de Raadt, and
 *      Aaron Campbell <aaron@monkey.org>.  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 Jason L. Wright,
 *      Theo de Raadt and Aaron Campbell.
 * 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 THE AUTHORS ``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.
 */

/*
 * Driver for 3c990 (Typhoon) Ethernet ASIC
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/serialize.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <sys/thread2.h>
#include <sys/interrupt.h>

#include <net/if.h>
#include <net/ifq_var.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/vlan/if_vlan_var.h>
#include <net/vlan/if_vlan_ether.h>

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

#include <net/if_media.h>

#include <net/bpf.h>

#include <vm/vm.h>              /* for vtophys */
#include <vm/pmap.h>            /* for vtophys */

#include "../mii_layer/mii.h"
#include "../mii_layer/miivar.h"

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

#define TXP_USEIOSPACE
#define __STRICT_ALIGNMENT

#include "if_txpreg.h"
#include "3c990img.h"

/*
 * Various supported device vendors/types and their names.
 */
static struct txp_type txp_devs[] = {
        { PCI_VENDOR_3COM, PCI_PRODUCT_3COM_3CR990TX95,
            "3Com 3cR990-TX-95 Etherlink with 3XP Processor" },
        { PCI_VENDOR_3COM, PCI_PRODUCT_3COM_3CR990TX97,
            "3Com 3cR990-TX-97 Etherlink with 3XP Processor" },
        { PCI_VENDOR_3COM, PCI_PRODUCT_3COM_3C990B,
            "3Com 3cR990B-TXM Etherlink with 3XP Processor" },
        { PCI_VENDOR_3COM, PCI_PRODUCT_3COM_3CR990SVR95,
            "3Com 3cR990-SRV-95 Etherlink Server with 3XP Processor" },
        { PCI_VENDOR_3COM, PCI_PRODUCT_3COM_3CR990SVR97,
            "3Com 3cR990-SRV-97 Etherlink Server with 3XP Processor" },
        { PCI_VENDOR_3COM, PCI_PRODUCT_3COM_3C990BSVR,
            "3Com 3cR990B-SRV Etherlink Server with 3XP Processor" },
        { 0, 0, NULL }
};

static int txp_probe    (device_t);
static int txp_attach   (device_t);
static int txp_detach   (device_t);
static void txp_intr    (void *);
static void txp_tick    (void *);
static int txp_shutdown (device_t);
static int txp_ioctl    (struct ifnet *, u_long, caddr_t, struct ucred *);
static void txp_start   (struct ifnet *, struct ifaltq_subque *);
static void txp_stop    (struct txp_softc *);
static void txp_init    (void *);
static void txp_watchdog        (struct ifnet *);

static void txp_release_resources (device_t);
static int txp_chip_init (struct txp_softc *);
static int txp_reset_adapter (struct txp_softc *);
static int txp_download_fw (struct txp_softc *);
static int txp_download_fw_wait (struct txp_softc *);
static int txp_download_fw_section (struct txp_softc *,
    struct txp_fw_section_header *, int);
static int txp_alloc_rings (struct txp_softc *);
static int txp_rxring_fill (struct txp_softc *);
static void txp_rxring_empty (struct txp_softc *);
static void txp_set_filter (struct txp_softc *);

static int txp_cmd_desc_numfree (struct txp_softc *);
static int txp_command (struct txp_softc *, u_int16_t, u_int16_t, u_int32_t,
    u_int32_t, u_int16_t *, u_int32_t *, u_int32_t *, int);
static int txp_command2 (struct txp_softc *, u_int16_t, u_int16_t,
    u_int32_t, u_int32_t, struct txp_ext_desc *, u_int8_t,
    struct txp_rsp_desc **, int);
static int txp_response (struct txp_softc *, u_int32_t, u_int16_t, u_int16_t,
    struct txp_rsp_desc **);
static void txp_rsp_fixup (struct txp_softc *, struct txp_rsp_desc *,
    struct txp_rsp_desc *);
static void txp_capabilities (struct txp_softc *);

static void txp_ifmedia_sts (struct ifnet *, struct ifmediareq *);
static int txp_ifmedia_upd (struct ifnet *);
#ifdef TXP_DEBUG
static void txp_show_descriptor (void *);
#endif
static void txp_tx_reclaim (struct txp_softc *, struct txp_tx_ring *);
static void txp_rxbuf_reclaim (struct txp_softc *);
static void txp_rx_reclaim (struct txp_softc *, struct txp_rx_ring *);

#ifdef TXP_USEIOSPACE
#define TXP_RES                 SYS_RES_IOPORT
#define TXP_RID                 TXP_PCI_LOIO
#else
#define TXP_RES                 SYS_RES_MEMORY
#define TXP_RID                 TXP_PCI_LOMEM
#endif

static device_method_t txp_methods[] = {
        /* Device interface */
        DEVMETHOD(device_probe,         txp_probe),
        DEVMETHOD(device_attach,        txp_attach),
        DEVMETHOD(device_detach,        txp_detach),
        DEVMETHOD(device_shutdown,      txp_shutdown),
        { 0, 0 }
};

static driver_t txp_driver = {
        "txp",
        txp_methods,
        sizeof(struct txp_softc)
};

static devclass_t txp_devclass;

DECLARE_DUMMY_MODULE(if_txp);
DRIVER_MODULE(if_txp, pci, txp_driver, txp_devclass, NULL, NULL);

static int
txp_probe(device_t dev)
{
        struct txp_type *t;
        uint16_t vid, did;

        vid = pci_get_vendor(dev);
        did = pci_get_device(dev);

        for (t = txp_devs; t->txp_name != NULL; ++t) {
                if ((vid == t->txp_vid) && (did == t->txp_did)) {
                        device_set_desc(dev, t->txp_name);
                        return(0);
                }
        }

        return(ENXIO);
}

static int
txp_attach(device_t dev)
{
        struct txp_softc *sc;
        struct ifnet *ifp;
        uint16_t p1;
        uint32_t p2;
        uint8_t enaddr[ETHER_ADDR_LEN];
        int error = 0, rid;

        sc = device_get_softc(dev);
        callout_init(&sc->txp_stat_timer);

        ifp = &sc->sc_arpcom.ac_if;
        if_initname(ifp, device_get_name(dev), device_get_unit(dev));

        pci_enable_busmaster(dev);

        rid = TXP_RID;
        sc->sc_res = bus_alloc_resource_any(dev, TXP_RES, &rid, RF_ACTIVE);

        if (sc->sc_res == NULL) {
                device_printf(dev, "couldn't map ports/memory\n");
                return(ENXIO);
        }

        sc->sc_bt = rman_get_bustag(sc->sc_res);
        sc->sc_bh = rman_get_bushandle(sc->sc_res);

        /* Allocate interrupt */
        rid = 0;
        sc->sc_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
            RF_SHAREABLE | RF_ACTIVE);

        if (sc->sc_irq == NULL) {
                device_printf(dev, "couldn't map interrupt\n");
                error = ENXIO;
                goto fail;
        }

        if (txp_chip_init(sc)) {
                error = ENXIO;
                goto fail;
        }

        sc->sc_fwbuf = contigmalloc(32768, M_DEVBUF,
            M_WAITOK, 0, 0xffffffff, PAGE_SIZE, 0);
        error = txp_download_fw(sc);
        contigfree(sc->sc_fwbuf, 32768, M_DEVBUF);
        sc->sc_fwbuf = NULL;

        if (error)
                goto fail;

        sc->sc_ldata = contigmalloc(sizeof(struct txp_ldata), M_DEVBUF,
            M_WAITOK | M_ZERO, 0, 0xffffffff, PAGE_SIZE, 0);

        if (txp_alloc_rings(sc)) {
                error = ENXIO;
                goto fail;
        }

        if (txp_command(sc, TXP_CMD_MAX_PKT_SIZE_WRITE, TXP_MAX_PKTLEN, 0, 0,
            NULL, NULL, NULL, 1)) {
                error = ENXIO;
                goto fail;
        }

        if (txp_command(sc, TXP_CMD_STATION_ADDRESS_READ, 0, 0, 0,
            &p1, &p2, NULL, 1)) {
                error = ENXIO;
                goto fail;
        }

        txp_set_filter(sc);

        enaddr[0] = ((uint8_t *)&p1)[1];
        enaddr[1] = ((uint8_t *)&p1)[0];
        enaddr[2] = ((uint8_t *)&p2)[3];
        enaddr[3] = ((uint8_t *)&p2)[2];
        enaddr[4] = ((uint8_t *)&p2)[1];
        enaddr[5] = ((uint8_t *)&p2)[0];

        ifmedia_init(&sc->sc_ifmedia, 0, txp_ifmedia_upd, txp_ifmedia_sts);
        ifmedia_add(&sc->sc_ifmedia, IFM_ETHER|IFM_10_T, 0, NULL);
        ifmedia_add(&sc->sc_ifmedia, IFM_ETHER|IFM_10_T|IFM_HDX, 0, NULL);
        ifmedia_add(&sc->sc_ifmedia, IFM_ETHER|IFM_10_T|IFM_FDX, 0, NULL);
        ifmedia_add(&sc->sc_ifmedia, IFM_ETHER|IFM_100_TX, 0, NULL);
        ifmedia_add(&sc->sc_ifmedia, IFM_ETHER|IFM_100_TX|IFM_HDX, 0, NULL);
        ifmedia_add(&sc->sc_ifmedia, IFM_ETHER|IFM_100_TX|IFM_FDX, 0, NULL);
        ifmedia_add(&sc->sc_ifmedia, IFM_ETHER|IFM_AUTO, 0, NULL);

        sc->sc_xcvr = TXP_XCVR_AUTO;
        txp_command(sc, TXP_CMD_XCVR_SELECT, TXP_XCVR_AUTO, 0, 0,
            NULL, NULL, NULL, 0);
        ifmedia_set(&sc->sc_ifmedia, IFM_ETHER|IFM_AUTO);

        ifp->if_softc = sc;
        ifp->if_mtu = ETHERMTU;
        ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
        ifp->if_ioctl = txp_ioctl;
        ifp->if_start = txp_start;
        ifp->if_watchdog = txp_watchdog;
        ifp->if_init = txp_init;
        ifp->if_baudrate = 100000000;
        ifq_set_maxlen(&ifp->if_snd, TX_ENTRIES);
        ifq_set_ready(&ifp->if_snd);
        ifp->if_hwassist = 0;
        txp_capabilities(sc);

        ether_ifattach(ifp, enaddr, NULL);

        error = bus_setup_intr(dev, sc->sc_irq, INTR_MPSAFE,
                               txp_intr, sc, &sc->sc_intrhand, 
                               ifp->if_serializer);
        if (error) {
                device_printf(dev, "couldn't set up irq\n");
                ether_ifdetach(ifp);
                goto fail;
        }

        ifq_set_cpuid(&ifp->if_snd, rman_get_cpuid(sc->sc_irq));

        return(0);

fail:
        txp_release_resources(dev);
        return(error);
}

static int
txp_detach(device_t dev)
{
        struct txp_softc *sc = device_get_softc(dev);
        struct ifnet *ifp = &sc->sc_arpcom.ac_if;
        int i;

        lwkt_serialize_enter(ifp->if_serializer);

        txp_stop(sc);
        txp_shutdown(dev);
        bus_teardown_intr(dev, sc->sc_irq, sc->sc_intrhand);

        lwkt_serialize_exit(ifp->if_serializer);

        ifmedia_removeall(&sc->sc_ifmedia);
        ether_ifdetach(ifp);

        for (i = 0; i < RXBUF_ENTRIES; i++)
                kfree(sc->sc_rxbufs[i].rb_sd, M_DEVBUF);

        txp_release_resources(dev);

        return(0);
}

static void
txp_release_resources(device_t dev)
{
        struct txp_softc *sc;

        sc = device_get_softc(dev);

        if (sc->sc_irq != NULL)
                bus_release_resource(dev, SYS_RES_IRQ, 0, sc->sc_irq);

        if (sc->sc_res != NULL)
                bus_release_resource(dev, TXP_RES, TXP_RID, sc->sc_res);

        if (sc->sc_ldata != NULL)
                contigfree(sc->sc_ldata, sizeof(struct txp_ldata), M_DEVBUF);

        return;
}

static int
txp_chip_init(struct txp_softc *sc)
{
        /* disable interrupts */
        WRITE_REG(sc, TXP_IER, 0);
        WRITE_REG(sc, TXP_IMR,
            TXP_INT_SELF | TXP_INT_PCI_TABORT | TXP_INT_PCI_MABORT |
            TXP_INT_DMA3 | TXP_INT_DMA2 | TXP_INT_DMA1 | TXP_INT_DMA0 |
            TXP_INT_LATCH);

        /* ack all interrupts */
        WRITE_REG(sc, TXP_ISR, TXP_INT_RESERVED | TXP_INT_LATCH |
            TXP_INT_A2H_7 | TXP_INT_A2H_6 | TXP_INT_A2H_5 | TXP_INT_A2H_4 |
            TXP_INT_SELF | TXP_INT_PCI_TABORT | TXP_INT_PCI_MABORT |
            TXP_INT_DMA3 | TXP_INT_DMA2 | TXP_INT_DMA1 | TXP_INT_DMA0 |
            TXP_INT_A2H_3 | TXP_INT_A2H_2 | TXP_INT_A2H_1 | TXP_INT_A2H_0);

        if (txp_reset_adapter(sc))
                return (-1);

        /* disable interrupts */
        WRITE_REG(sc, TXP_IER, 0);
        WRITE_REG(sc, TXP_IMR,
            TXP_INT_SELF | TXP_INT_PCI_TABORT | TXP_INT_PCI_MABORT |
            TXP_INT_DMA3 | TXP_INT_DMA2 | TXP_INT_DMA1 | TXP_INT_DMA0 |
            TXP_INT_LATCH);

        /* ack all interrupts */
        WRITE_REG(sc, TXP_ISR, TXP_INT_RESERVED | TXP_INT_LATCH |
            TXP_INT_A2H_7 | TXP_INT_A2H_6 | TXP_INT_A2H_5 | TXP_INT_A2H_4 |
            TXP_INT_SELF | TXP_INT_PCI_TABORT | TXP_INT_PCI_MABORT |
            TXP_INT_DMA3 | TXP_INT_DMA2 | TXP_INT_DMA1 | TXP_INT_DMA0 |
            TXP_INT_A2H_3 | TXP_INT_A2H_2 | TXP_INT_A2H_1 | TXP_INT_A2H_0);

        return (0);
}

static int
txp_reset_adapter(struct txp_softc *sc)
{
        u_int32_t r;
        int i;

        WRITE_REG(sc, TXP_SRR, TXP_SRR_ALL);
        DELAY(1000);
        WRITE_REG(sc, TXP_SRR, 0);

        /* Should wait max 6 seconds */
        for (i = 0; i < 6000; i++) {
                r = READ_REG(sc, TXP_A2H_0);
                if (r == STAT_WAITING_FOR_HOST_REQUEST)
                        break;
                DELAY(1000);
        }

        if (r != STAT_WAITING_FOR_HOST_REQUEST) {
                if_printf(&sc->sc_arpcom.ac_if, "reset hung\n");
                return (-1);
        }

        return (0);
}

static int
txp_download_fw(struct txp_softc *sc)
{
        struct txp_fw_file_header *fileheader;
        struct txp_fw_section_header *secthead;
        int sect;
        u_int32_t r, i, ier, imr;

        ier = READ_REG(sc, TXP_IER);
        WRITE_REG(sc, TXP_IER, ier | TXP_INT_A2H_0);

        imr = READ_REG(sc, TXP_IMR);
        WRITE_REG(sc, TXP_IMR, imr | TXP_INT_A2H_0);

        for (i = 0; i < 10000; i++) {
                r = READ_REG(sc, TXP_A2H_0);
                if (r == STAT_WAITING_FOR_HOST_REQUEST)
                        break;
                DELAY(50);
        }
        if (r != STAT_WAITING_FOR_HOST_REQUEST) {
                if_printf(&sc->sc_arpcom.ac_if,
                          "not waiting for host request\n");
                return (-1);
        }

        /* Ack the status */
        WRITE_REG(sc, TXP_ISR, TXP_INT_A2H_0);

        fileheader = (struct txp_fw_file_header *)tc990image;
        if (bcmp("TYPHOON", fileheader->magicid, sizeof(fileheader->magicid))) {
                if_printf(&sc->sc_arpcom.ac_if, "fw invalid magic\n");
                return (-1);
        }

        /* Tell boot firmware to get ready for image */
        WRITE_REG(sc, TXP_H2A_1, fileheader->addr);
        WRITE_REG(sc, TXP_H2A_0, TXP_BOOTCMD_RUNTIME_IMAGE);

        if (txp_download_fw_wait(sc)) {
                if_printf(&sc->sc_arpcom.ac_if, "fw wait failed, initial\n");
                return (-1);
        }

        secthead = (struct txp_fw_section_header *)(((u_int8_t *)tc990image) +
            sizeof(struct txp_fw_file_header));

        for (sect = 0; sect < fileheader->nsections; sect++) {
                if (txp_download_fw_section(sc, secthead, sect))
                        return (-1);
                secthead = (struct txp_fw_section_header *)
                    (((u_int8_t *)secthead) + secthead->nbytes +
                    sizeof(*secthead));
        }

        WRITE_REG(sc, TXP_H2A_0, TXP_BOOTCMD_DOWNLOAD_COMPLETE);

        for (i = 0; i < 10000; i++) {
                r = READ_REG(sc, TXP_A2H_0);
                if (r == STAT_WAITING_FOR_BOOT)
                        break;
                DELAY(50);
        }
        if (r != STAT_WAITING_FOR_BOOT) {
                if_printf(&sc->sc_arpcom.ac_if, "not waiting for boot\n");
                return (-1);
        }

        WRITE_REG(sc, TXP_IER, ier);
        WRITE_REG(sc, TXP_IMR, imr);

        return (0);
}

static int
txp_download_fw_wait(struct txp_softc *sc)
{
        u_int32_t i, r;

        for (i = 0; i < 10000; i++) {
                r = READ_REG(sc, TXP_ISR);
                if (r & TXP_INT_A2H_0)
                        break;
                DELAY(50);
        }

        if (!(r & TXP_INT_A2H_0)) {
                if_printf(&sc->sc_arpcom.ac_if, "fw wait failed comm0\n");
                return (-1);
        }

        WRITE_REG(sc, TXP_ISR, TXP_INT_A2H_0);

        r = READ_REG(sc, TXP_A2H_0);
        if (r != STAT_WAITING_FOR_SEGMENT) {
                if_printf(&sc->sc_arpcom.ac_if, "fw not waiting for segment\n");
                return (-1);
        }
        return (0);
}

static int
txp_download_fw_section(struct txp_softc *sc,
                        struct txp_fw_section_header *sect, int sectnum)
{
        vm_offset_t dma;
        int rseg, err = 0;
        struct mbuf m;
        u_int16_t csum;

        /* Skip zero length sections */
        if (sect->nbytes == 0)
                return (0);

        /* Make sure we aren't past the end of the image */
        rseg = ((u_int8_t *)sect) - ((u_int8_t *)tc990image);
        if (rseg >= sizeof(tc990image)) {
                if_printf(&sc->sc_arpcom.ac_if, "fw invalid section address, "
                    "section %d\n", sectnum);
                return (-1);
        }

        /* Make sure this section doesn't go past the end */
        rseg += sect->nbytes;
        if (rseg >= sizeof(tc990image)) {
                if_printf(&sc->sc_arpcom.ac_if, "fw truncated section %d\n",
                    sectnum);
                return (-1);
        }

        bcopy(((u_int8_t *)sect) + sizeof(*sect), sc->sc_fwbuf, sect->nbytes);
        dma = vtophys(sc->sc_fwbuf);

        /*
         * dummy up mbuf and verify section checksum
         */
        m.m_type = MT_DATA;
        m.m_next = m.m_nextpkt = NULL;
        m.m_len = sect->nbytes;
        m.m_data = sc->sc_fwbuf;
        m.m_flags = 0;
        csum = in_cksum(&m, sect->nbytes);
        if (csum != sect->cksum) {
                if_printf(&sc->sc_arpcom.ac_if, "fw section %d, bad "
                    "cksum (expected 0x%x got 0x%x)\n",
                    sectnum, sect->cksum, csum);
                err = -1;
                goto bail;
        }

        WRITE_REG(sc, TXP_H2A_1, sect->nbytes);
        WRITE_REG(sc, TXP_H2A_2, sect->cksum);
        WRITE_REG(sc, TXP_H2A_3, sect->addr);
        WRITE_REG(sc, TXP_H2A_4, 0);
        WRITE_REG(sc, TXP_H2A_5, dma & 0xffffffff);
        WRITE_REG(sc, TXP_H2A_0, TXP_BOOTCMD_SEGMENT_AVAILABLE);

        if (txp_download_fw_wait(sc)) {
                if_printf(&sc->sc_arpcom.ac_if, "fw wait failed, "
                    "section %d\n", sectnum);
                err = -1;
        }

bail:
        return (err);
}

static void 
txp_intr(void *vsc)
{
        struct txp_softc *sc = vsc;
        struct txp_hostvar *hv = sc->sc_hostvar;
        u_int32_t isr;

        /* mask all interrupts */
        WRITE_REG(sc, TXP_IMR, TXP_INT_RESERVED | TXP_INT_SELF |
            TXP_INT_A2H_7 | TXP_INT_A2H_6 | TXP_INT_A2H_5 | TXP_INT_A2H_4 |
            TXP_INT_A2H_2 | TXP_INT_A2H_1 | TXP_INT_A2H_0 |
            TXP_INT_DMA3 | TXP_INT_DMA2 | TXP_INT_DMA1 | TXP_INT_DMA0 |
            TXP_INT_PCI_TABORT | TXP_INT_PCI_MABORT |  TXP_INT_LATCH);

        isr = READ_REG(sc, TXP_ISR);
        while (isr) {
                WRITE_REG(sc, TXP_ISR, isr);

                if ((*sc->sc_rxhir.r_roff) != (*sc->sc_rxhir.r_woff))
                        txp_rx_reclaim(sc, &sc->sc_rxhir);
                if ((*sc->sc_rxlor.r_roff) != (*sc->sc_rxlor.r_woff))
                        txp_rx_reclaim(sc, &sc->sc_rxlor);

                if (hv->hv_rx_buf_write_idx == hv->hv_rx_buf_read_idx)
                        txp_rxbuf_reclaim(sc);

                if (sc->sc_txhir.r_cnt && (sc->sc_txhir.r_cons !=
                    TXP_OFFSET2IDX(*(sc->sc_txhir.r_off))))
                        txp_tx_reclaim(sc, &sc->sc_txhir);

                if (sc->sc_txlor.r_cnt && (sc->sc_txlor.r_cons !=
                    TXP_OFFSET2IDX(*(sc->sc_txlor.r_off))))
                        txp_tx_reclaim(sc, &sc->sc_txlor);

                isr = READ_REG(sc, TXP_ISR);
        }

        /* unmask all interrupts */
        WRITE_REG(sc, TXP_IMR, TXP_INT_A2H_3);

        if_devstart(&sc->sc_arpcom.ac_if);
}

static void
txp_rx_reclaim(struct txp_softc *sc, struct txp_rx_ring *r)
{
        struct ifnet *ifp = &sc->sc_arpcom.ac_if;
        struct txp_rx_desc *rxd;
        struct mbuf *m;
        struct txp_swdesc *sd = NULL;
        u_int32_t roff, woff;

        roff = *r->r_roff;
        woff = *r->r_woff;
        rxd = r->r_desc + (roff / sizeof(struct txp_rx_desc));

        while (roff != woff) {

                if (rxd->rx_flags & RX_FLAGS_ERROR) {
                        if_printf(ifp, "error 0x%x\n", rxd->rx_stat);
                        IFNET_STAT_INC(ifp, ierrors, 1);
                        goto next;
                }

                /* retrieve stashed pointer */
                sd = rxd->rx_sd;

                m = sd->sd_mbuf;
                sd->sd_mbuf = NULL;

                m->m_pkthdr.len = m->m_len = rxd->rx_len;

#ifdef __STRICT_ALIGNMENT
                {
                        /*
                         * XXX Nice chip, except it won't accept "off by 2"
                         * buffers, so we're force to copy.  Supposedly
                         * this will be fixed in a newer firmware rev
                         * and this will be temporary.
                         */
                        struct mbuf *mnew;

                        MGETHDR(mnew, MB_DONTWAIT, MT_DATA);
                        if (mnew == NULL) {
                                m_freem(m);
                                goto next;
                        }
                        if (m->m_len > (MHLEN - 2)) {
                                MCLGET(mnew, MB_DONTWAIT);
                                if (!(mnew->m_flags & M_EXT)) {
                                        m_freem(mnew);
                                        m_freem(m);
                                        goto next;
                                }
                        }
                        mnew->m_pkthdr.rcvif = ifp;
                        m_adj(mnew, 2);
                        mnew->m_pkthdr.len = mnew->m_len = m->m_len;
                        m_copydata(m, 0, m->m_pkthdr.len, mtod(mnew, caddr_t));
                        m_freem(m);
                        m = mnew;
                }
#endif

                if (rxd->rx_stat & RX_STAT_IPCKSUMBAD)
                        m->m_pkthdr.csum_flags |= CSUM_IP_CHECKED;
                else if (rxd->rx_stat & RX_STAT_IPCKSUMGOOD)
                        m->m_pkthdr.csum_flags |=
                            CSUM_IP_CHECKED|CSUM_IP_VALID;

                if ((rxd->rx_stat & RX_STAT_TCPCKSUMGOOD) ||
                    (rxd->rx_stat & RX_STAT_UDPCKSUMGOOD)) {
                        m->m_pkthdr.csum_flags |=
                            CSUM_DATA_VALID|CSUM_PSEUDO_HDR|
                            CSUM_FRAG_NOT_CHECKED;
                        m->m_pkthdr.csum_data = 0xffff;
                }

                if (rxd->rx_stat & RX_STAT_VLAN) {
                        m->m_flags |= M_VLANTAG;
                        m->m_pkthdr.ether_vlantag = htons(rxd->rx_vlan >> 16);
                }
                ifp->if_input(ifp, m);

next:

                roff += sizeof(struct txp_rx_desc);
                if (roff == (RX_ENTRIES * sizeof(struct txp_rx_desc))) {
                        roff = 0;
                        rxd = r->r_desc;
                } else
                        rxd++;
                woff = *r->r_woff;
        }

        *r->r_roff = woff;

        return;
}

static void
txp_rxbuf_reclaim(struct txp_softc *sc)
{
        struct ifnet *ifp = &sc->sc_arpcom.ac_if;
        struct txp_hostvar *hv = sc->sc_hostvar;
        struct txp_rxbuf_desc *rbd;
        struct txp_swdesc *sd;
        u_int32_t i;

        if (!(ifp->if_flags & IFF_RUNNING))
                return;

        i = sc->sc_rxbufprod;
        rbd = sc->sc_rxbufs + i;

        while (1) {
                sd = rbd->rb_sd;
                if (sd->sd_mbuf != NULL)
                        break;

                MGETHDR(sd->sd_mbuf, MB_DONTWAIT, MT_DATA);
                if (sd->sd_mbuf == NULL)
                        goto err_sd;

                MCLGET(sd->sd_mbuf, MB_DONTWAIT);
                if ((sd->sd_mbuf->m_flags & M_EXT) == 0)
                        goto err_mbuf;
                sd->sd_mbuf->m_pkthdr.rcvif = ifp;
                sd->sd_mbuf->m_pkthdr.len = sd->sd_mbuf->m_len = MCLBYTES;

                rbd->rb_paddrlo = vtophys(mtod(sd->sd_mbuf, vm_offset_t))
                    & 0xffffffff;
                rbd->rb_paddrhi = 0;

                hv->hv_rx_buf_write_idx = TXP_IDX2OFFSET(i);

                if (++i == RXBUF_ENTRIES) {
                        i = 0;
                        rbd = sc->sc_rxbufs;
                } else
                        rbd++;
        }

        sc->sc_rxbufprod = i;

        return;

err_mbuf:
        m_freem(sd->sd_mbuf);
err_sd:
        kfree(sd, M_DEVBUF);
}

/*
 * Reclaim mbufs and entries from a transmit ring.
 */
static void
txp_tx_reclaim(struct txp_softc *sc, struct txp_tx_ring *r)
{
        struct ifnet *ifp = &sc->sc_arpcom.ac_if;
        u_int32_t idx = TXP_OFFSET2IDX(*(r->r_off));
        u_int32_t cons = r->r_cons, cnt = r->r_cnt;
        struct txp_tx_desc *txd = r->r_desc + cons;
        struct txp_swdesc *sd = sc->sc_txd + cons;
        struct mbuf *m;

        while (cons != idx) {
                if (cnt == 0)
                        break;

                if ((txd->tx_flags & TX_FLAGS_TYPE_M) ==
                    TX_FLAGS_TYPE_DATA) {
                        m = sd->sd_mbuf;
                        if (m != NULL) {
                                m_freem(m);
                                txd->tx_addrlo = 0;
                                txd->tx_addrhi = 0;
                                IFNET_STAT_INC(ifp, opackets, 1);
                        }
                }
                ifq_clr_oactive(&ifp->if_snd);

                if (++cons == TX_ENTRIES) {
                        txd = r->r_desc;
                        cons = 0;
                        sd = sc->sc_txd;
                } else {
                        txd++;
                        sd++;
                }

                cnt--;
        }

        r->r_cons = cons;
        r->r_cnt = cnt;
        if (cnt == 0)
                ifp->if_timer = 0;
}

static int
txp_shutdown(device_t dev)
{
        struct txp_softc *sc;
        struct ifnet *ifp;

        sc = device_get_softc(dev);
        ifp = &sc->sc_arpcom.ac_if;
        lwkt_serialize_enter(ifp->if_serializer);

        /* mask all interrupts */
        WRITE_REG(sc, TXP_IMR,
            TXP_INT_SELF | TXP_INT_PCI_TABORT | TXP_INT_PCI_MABORT |
            TXP_INT_DMA3 | TXP_INT_DMA2 | TXP_INT_DMA1 | TXP_INT_DMA0 |
            TXP_INT_LATCH);

        txp_command(sc, TXP_CMD_TX_DISABLE, 0, 0, 0, NULL, NULL, NULL, 0);
        txp_command(sc, TXP_CMD_RX_DISABLE, 0, 0, 0, NULL, NULL, NULL, 0);
        txp_command(sc, TXP_CMD_HALT, 0, 0, 0, NULL, NULL, NULL, 0);

        lwkt_serialize_exit(ifp->if_serializer);
        return(0);
}

static int
txp_alloc_rings(struct txp_softc *sc)
{
        struct txp_boot_record *boot;
        struct txp_ldata *ld;
        u_int32_t r;
        int i;

        ld = sc->sc_ldata;
        boot = &ld->txp_boot;

        /* boot record */
        sc->sc_boot = boot;

        /* host variables */
        bzero(&ld->txp_hostvar, sizeof(struct txp_hostvar));
        boot->br_hostvar_lo = vtophys(&ld->txp_hostvar);
        boot->br_hostvar_hi = 0;
        sc->sc_hostvar = (struct txp_hostvar *)&ld->txp_hostvar;

        /* hi priority tx ring */
        boot->br_txhipri_lo = vtophys(&ld->txp_txhiring);
        boot->br_txhipri_hi = 0;
        boot->br_txhipri_siz = TX_ENTRIES * sizeof(struct txp_tx_desc);
        sc->sc_txhir.r_reg = TXP_H2A_1;
        sc->sc_txhir.r_desc = (struct txp_tx_desc *)&ld->txp_txhiring;
        sc->sc_txhir.r_cons = sc->sc_txhir.r_prod = sc->sc_txhir.r_cnt = 0;
        sc->sc_txhir.r_off = &sc->sc_hostvar->hv_tx_hi_desc_read_idx;

        /* lo priority tx ring */
        boot->br_txlopri_lo = vtophys(&ld->txp_txloring);
        boot->br_txlopri_hi = 0;
        boot->br_txlopri_siz = TX_ENTRIES * sizeof(struct txp_tx_desc);
        sc->sc_txlor.r_reg = TXP_H2A_3;
        sc->sc_txlor.r_desc = (struct txp_tx_desc *)&ld->txp_txloring;
        sc->sc_txlor.r_cons = sc->sc_txlor.r_prod = sc->sc_txlor.r_cnt = 0;
        sc->sc_txlor.r_off = &sc->sc_hostvar->hv_tx_lo_desc_read_idx;

        /* high priority rx ring */
        boot->br_rxhipri_lo = vtophys(&ld->txp_rxhiring);
        boot->br_rxhipri_hi = 0;
        boot->br_rxhipri_siz = RX_ENTRIES * sizeof(struct txp_rx_desc);
        sc->sc_rxhir.r_desc = (struct txp_rx_desc *)&ld->txp_rxhiring;
        sc->sc_rxhir.r_roff = &sc->sc_hostvar->hv_rx_hi_read_idx;
        sc->sc_rxhir.r_woff = &sc->sc_hostvar->hv_rx_hi_write_idx;

        /* low priority rx ring */
        boot->br_rxlopri_lo = vtophys(&ld->txp_rxloring);
        boot->br_rxlopri_hi = 0;
        boot->br_rxlopri_siz = RX_ENTRIES * sizeof(struct txp_rx_desc);
        sc->sc_rxlor.r_desc = (struct txp_rx_desc *)&ld->txp_rxloring;
        sc->sc_rxlor.r_roff = &sc->sc_hostvar->hv_rx_lo_read_idx;
        sc->sc_rxlor.r_woff = &sc->sc_hostvar->hv_rx_lo_write_idx;

        /* command ring */
        bzero(&ld->txp_cmdring, sizeof(struct txp_cmd_desc) * CMD_ENTRIES);
        boot->br_cmd_lo = vtophys(&ld->txp_cmdring);
        boot->br_cmd_hi = 0;
        boot->br_cmd_siz = CMD_ENTRIES * sizeof(struct txp_cmd_desc);
        sc->sc_cmdring.base = (struct txp_cmd_desc *)&ld->txp_cmdring;
        sc->sc_cmdring.size = CMD_ENTRIES * sizeof(struct txp_cmd_desc);
        sc->sc_cmdring.lastwrite = 0;

        /* response ring */
        bzero(&ld->txp_rspring, sizeof(struct txp_rsp_desc) * RSP_ENTRIES);
        boot->br_resp_lo = vtophys(&ld->txp_rspring);
        boot->br_resp_hi = 0;
        boot->br_resp_siz = CMD_ENTRIES * sizeof(struct txp_rsp_desc);
        sc->sc_rspring.base = (struct txp_rsp_desc *)&ld->txp_rspring;
        sc->sc_rspring.size = RSP_ENTRIES * sizeof(struct txp_rsp_desc);
        sc->sc_rspring.lastwrite = 0;

        /* receive buffer ring */
        boot->br_rxbuf_lo = vtophys(&ld->txp_rxbufs);
        boot->br_rxbuf_hi = 0;
        boot->br_rxbuf_siz = RXBUF_ENTRIES * sizeof(struct txp_rxbuf_desc);
        sc->sc_rxbufs = (struct txp_rxbuf_desc *)&ld->txp_rxbufs;

        for (i = 0; i < RXBUF_ENTRIES; i++) {
                struct txp_swdesc *sd;
                if (sc->sc_rxbufs[i].rb_sd != NULL)
                        continue;
                sc->sc_rxbufs[i].rb_sd = kmalloc(sizeof(struct txp_swdesc),
                    M_DEVBUF, M_WAITOK);
                sd = sc->sc_rxbufs[i].rb_sd;
                sd->sd_mbuf = NULL;
        }
        sc->sc_rxbufprod = 0;

        /* zero dma */
        bzero(&ld->txp_zero, sizeof(u_int32_t));
        boot->br_zero_lo = vtophys(&ld->txp_zero);
        boot->br_zero_hi = 0;

        /* See if it's waiting for boot, and try to boot it */
        for (i = 0; i < 10000; i++) {
                r = READ_REG(sc, TXP_A2H_0);
                if (r == STAT_WAITING_FOR_BOOT)
                        break;
                DELAY(50);
        }

        if (r != STAT_WAITING_FOR_BOOT) {
                if_printf(&sc->sc_arpcom.ac_if, "not waiting for boot\n");
                return(ENXIO);
        }

        WRITE_REG(sc, TXP_H2A_2, 0);
        WRITE_REG(sc, TXP_H2A_1, vtophys(sc->sc_boot));
        WRITE_REG(sc, TXP_H2A_0, TXP_BOOTCMD_REGISTER_BOOT_RECORD);

        /* See if it booted */
        for (i = 0; i < 10000; i++) {
                r = READ_REG(sc, TXP_A2H_0);
                if (r == STAT_RUNNING)
                        break;
                DELAY(50);
        }
        if (r != STAT_RUNNING) {
                if_printf(&sc->sc_arpcom.ac_if, "fw not running\n");
                return(ENXIO);
        }

        /* Clear TX and CMD ring write registers */
        WRITE_REG(sc, TXP_H2A_1, TXP_BOOTCMD_NULL);
        WRITE_REG(sc, TXP_H2A_2, TXP_BOOTCMD_NULL);
        WRITE_REG(sc, TXP_H2A_3, TXP_BOOTCMD_NULL);
        WRITE_REG(sc, TXP_H2A_0, TXP_BOOTCMD_NULL);

        return (0);
}

static int
txp_ioctl(struct ifnet *ifp, u_long command, caddr_t data, struct ucred *cr)
{
        struct txp_softc *sc = ifp->if_softc;
        struct ifreq *ifr = (struct ifreq *)data;
        int error = 0;

        switch(command) {
        case SIOCSIFFLAGS:
                if (ifp->if_flags & IFF_UP) {
                        txp_init(sc);
                } else {
                        if (ifp->if_flags & IFF_RUNNING)
                                txp_stop(sc);
                }
                break;
        case SIOCADDMULTI:
        case SIOCDELMULTI:
                /*
                 * Multicast list has changed; set the hardware
                 * filter accordingly.
                 */
                txp_set_filter(sc);
                error = 0;
                break;
        case SIOCGIFMEDIA:
        case SIOCSIFMEDIA:
                error = ifmedia_ioctl(ifp, ifr, &sc->sc_ifmedia, command);
                break;
        default:
                error = ether_ioctl(ifp, command, data);
                break;
        }
        return(error);
}

static int
txp_rxring_fill(struct txp_softc *sc)
{
        int i;
        struct ifnet *ifp;
        struct txp_swdesc *sd;

        ifp = &sc->sc_arpcom.ac_if;

        for (i = 0; i < RXBUF_ENTRIES; i++) {
                sd = sc->sc_rxbufs[i].rb_sd;
                MGETHDR(sd->sd_mbuf, MB_DONTWAIT, MT_DATA);
                if (sd->sd_mbuf == NULL)
                        return(ENOBUFS);

                MCLGET(sd->sd_mbuf, MB_DONTWAIT);
                if ((sd->sd_mbuf->m_flags & M_EXT) == 0) {
                        m_freem(sd->sd_mbuf);
                        return(ENOBUFS);
                }
                sd->sd_mbuf->m_pkthdr.len = sd->sd_mbuf->m_len = MCLBYTES;
                sd->sd_mbuf->m_pkthdr.rcvif = ifp;

                sc->sc_rxbufs[i].rb_paddrlo =
                    vtophys(mtod(sd->sd_mbuf, vm_offset_t));
                sc->sc_rxbufs[i].rb_paddrhi = 0;
        }

        sc->sc_hostvar->hv_rx_buf_write_idx = (RXBUF_ENTRIES - 1) *
            sizeof(struct txp_rxbuf_desc);

        return(0);
}

static void
txp_rxring_empty(struct txp_softc *sc)
{
        int i;
        struct txp_swdesc *sd;

        if (sc->sc_rxbufs == NULL)
                return;

        for (i = 0; i < RXBUF_ENTRIES; i++) {
                if (&sc->sc_rxbufs[i] == NULL)
                        continue;
                sd = sc->sc_rxbufs[i].rb_sd;
                if (sd == NULL)
                        continue;
                if (sd->sd_mbuf != NULL) {
                        m_freem(sd->sd_mbuf);
                        sd->sd_mbuf = NULL;
                }
        }

        return;
}

static void
txp_init(void *xsc)
{
        struct txp_softc *sc;
        struct ifnet *ifp;
        u_int16_t p1;
        u_int32_t p2;

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

        if (ifp->if_flags & IFF_RUNNING)
                return;

        txp_stop(sc);

        txp_command(sc, TXP_CMD_MAX_PKT_SIZE_WRITE, TXP_MAX_PKTLEN, 0, 0,
            NULL, NULL, NULL, 1);

        /* Set station address. */
        ((u_int8_t *)&p1)[1] = sc->sc_arpcom.ac_enaddr[0];
        ((u_int8_t *)&p1)[0] = sc->sc_arpcom.ac_enaddr[1];
        ((u_int8_t *)&p2)[3] = sc->sc_arpcom.ac_enaddr[2];
        ((u_int8_t *)&p2)[2] = sc->sc_arpcom.ac_enaddr[3];
        ((u_int8_t *)&p2)[1] = sc->sc_arpcom.ac_enaddr[4];
        ((u_int8_t *)&p2)[0] = sc->sc_arpcom.ac_enaddr[5];
        txp_command(sc, TXP_CMD_STATION_ADDRESS_WRITE, p1, p2, 0,
            NULL, NULL, NULL, 1);

        txp_set_filter(sc);

        txp_rxring_fill(sc);

        txp_command(sc, TXP_CMD_TX_ENABLE, 0, 0, 0, NULL, NULL, NULL, 1);
        txp_command(sc, TXP_CMD_RX_ENABLE, 0, 0, 0, NULL, NULL, NULL, 1);

        WRITE_REG(sc, TXP_IER, TXP_INT_RESERVED | TXP_INT_SELF |
            TXP_INT_A2H_7 | TXP_INT_A2H_6 | TXP_INT_A2H_5 | TXP_INT_A2H_4 |
            TXP_INT_A2H_2 | TXP_INT_A2H_1 | TXP_INT_A2H_0 |
            TXP_INT_DMA3 | TXP_INT_DMA2 | TXP_INT_DMA1 | TXP_INT_DMA0 |
            TXP_INT_PCI_TABORT | TXP_INT_PCI_MABORT |  TXP_INT_LATCH);
        WRITE_REG(sc, TXP_IMR, TXP_INT_A2H_3);

        ifp->if_flags |= IFF_RUNNING;
        ifq_clr_oactive(&ifp->if_snd);
        ifp->if_timer = 0;

        callout_reset(&sc->txp_stat_timer, hz, txp_tick, sc);
}

static void
txp_tick(void *vsc)
{
        struct txp_softc *sc = vsc;
        struct ifnet *ifp = &sc->sc_arpcom.ac_if;
        struct txp_rsp_desc *rsp = NULL;
        struct txp_ext_desc *ext;

        lwkt_serialize_enter(ifp->if_serializer);
        txp_rxbuf_reclaim(sc);

        if (txp_command2(sc, TXP_CMD_READ_STATISTICS, 0, 0, 0, NULL, 0,
            &rsp, 1))
                goto out;
        if (rsp->rsp_numdesc != 6)
                goto out;
        if (txp_command(sc, TXP_CMD_CLEAR_STATISTICS, 0, 0, 0,
            NULL, NULL, NULL, 1))
                goto out;
        ext = (struct txp_ext_desc *)(rsp + 1);

        IFNET_STAT_INC(ifp, ierrors,
            ext[3].ext_2 + ext[3].ext_3 + ext[3].ext_4 +
            ext[4].ext_1 + ext[4].ext_4);
        IFNET_STAT_INC(ifp, oerrors,
            ext[0].ext_1 + ext[1].ext_1 + ext[1].ext_4 + ext[2].ext_1);
        IFNET_STAT_INC(ifp, collisions,
            ext[0].ext_2 + ext[0].ext_3 + ext[1].ext_2 + ext[1].ext_3);
        IFNET_STAT_INC(ifp, opackets, rsp->rsp_par2);
        IFNET_STAT_INC(ifp, ipackets, ext[2].ext_3);

out:
        if (rsp != NULL)
                kfree(rsp, M_DEVBUF);

        callout_reset(&sc->txp_stat_timer, hz, txp_tick, sc);
        lwkt_serialize_exit(ifp->if_serializer);
}

static void
txp_start(struct ifnet *ifp, struct ifaltq_subque *ifsq)
{
        struct txp_softc *sc = ifp->if_softc;
        struct txp_tx_ring *r = &sc->sc_txhir;
        struct txp_tx_desc *txd;
        struct txp_frag_desc *fxd;
        struct mbuf *m, *m0, *m_defragged;
        struct txp_swdesc *sd;
        u_int32_t firstprod, firstcnt, prod, cnt;

        ASSERT_ALTQ_SQ_DEFAULT(ifp, ifsq);

        if ((ifp->if_flags & IFF_RUNNING) == 0 || ifq_is_oactive(&ifp->if_snd))
                return;

        prod = r->r_prod;
        cnt = r->r_cnt;

        while (1) {
                int frag;

                firstprod = prod;
                firstcnt = cnt;

                if ((TX_ENTRIES - cnt) < 4)
                        goto oactive;

                m_defragged = NULL;
                m = ifq_dequeue(&ifp->if_snd, NULL);
                if (m == NULL)
                        break;
again:
                frag = 1;       /* Extra desc */
                for (m0 = m; m0 != NULL; m0 = m0->m_next)
                        ++frag;
                if ((cnt + frag) >= (TX_ENTRIES - 4)) {
                        if (m_defragged != NULL) {
                                /*
                                 * Even after defragmentation, there
                                 * are still too many fragments, so
                                 * drop this packet.
                                 */
                                m_freem(m);
                                goto oactive;
                        }

                        m_defragged = m_defrag(m, MB_DONTWAIT);
                        if (m_defragged == NULL) {
                                m_freem(m);
                                continue;
                        }
                        m = m_defragged;

                        /* Recount # of fragments */
                        goto again;
                }

                sd = sc->sc_txd + prod;
                sd->sd_mbuf = m;

                txd = r->r_desc + prod;
                txd->tx_flags = TX_FLAGS_TYPE_DATA;
                txd->tx_numdesc = 0;
                txd->tx_addrlo = 0;
                txd->tx_addrhi = 0;
                txd->tx_totlen = 0;
                txd->tx_pflags = 0;

                if (++prod == TX_ENTRIES)
                        prod = 0;

                ++cnt;
                KASSERT(cnt < (TX_ENTRIES - 4), ("too many frag"));

                if (m->m_flags & M_VLANTAG) {
                        txd->tx_pflags = TX_PFLAGS_VLAN |
                            (htons(m->m_pkthdr.ether_vlantag) <<
                             TX_PFLAGS_VLANTAG_S);
                }

                if (m->m_pkthdr.csum_flags & CSUM_IP)
                        txd->tx_pflags |= TX_PFLAGS_IPCKSUM;

#if 0
                if (m->m_pkthdr.csum_flags & CSUM_TCP)
                        txd->tx_pflags |= TX_PFLAGS_TCPCKSUM;
                if (m->m_pkthdr.csum_flags & CSUM_UDP)
                        txd->tx_pflags |= TX_PFLAGS_UDPCKSUM;
#endif

                fxd = (struct txp_frag_desc *)(r->r_desc + prod);
                for (m0 = m; m0 != NULL; m0 = m0->m_next) {
                        if (m0->m_len == 0)
                                continue;

                        ++cnt;
                        KASSERT(cnt < (TX_ENTRIES - 4), ("too many frag"));

                        txd->tx_numdesc++;

                        fxd->frag_flags = FRAG_FLAGS_TYPE_FRAG;
                        fxd->frag_rsvd1 = 0;
                        fxd->frag_len = m0->m_len;
                        fxd->frag_addrlo = vtophys(mtod(m0, vm_offset_t));
                        fxd->frag_addrhi = 0;
                        fxd->frag_rsvd2 = 0;

                        if (++prod == TX_ENTRIES) {
                                fxd = (struct txp_frag_desc *)r->r_desc;
                                prod = 0;
                        } else
                                fxd++;
                }

                ifp->if_timer = 5;

                ETHER_BPF_MTAP(ifp, m);
                WRITE_REG(sc, r->r_reg, TXP_IDX2OFFSET(prod));
        }

        r->r_prod = prod;
        r->r_cnt = cnt;
        return;

oactive:
        ifq_set_oactive(&ifp->if_snd);
        r->r_prod = firstprod;
        r->r_cnt = firstcnt;
        return;
}

/*
 * Handle simple commands sent to the typhoon
 */
static int
txp_command(struct txp_softc *sc, u_int16_t id, u_int16_t in1, u_int32_t in2,
            u_int32_t in3, u_int16_t *out1, u_int32_t *out2, u_int32_t *out3,
            int wait)
{
        struct txp_rsp_desc *rsp = NULL;

        if (txp_command2(sc, id, in1, in2, in3, NULL, 0, &rsp, wait))
                return (-1);

        if (!wait)
                return (0);

        if (out1 != NULL)
                *out1 = rsp->rsp_par1;
        if (out2 != NULL)
                *out2 = rsp->rsp_par2;
        if (out3 != NULL)
                *out3 = rsp->rsp_par3;
        kfree(rsp, M_DEVBUF);
        return (0);
}

static int
txp_command2(struct txp_softc *sc, u_int16_t id, u_int16_t in1, u_int32_t in2,
             u_int32_t in3, struct txp_ext_desc *in_extp, u_int8_t in_extn,
             struct txp_rsp_desc **rspp, int wait)
{
        struct txp_hostvar *hv = sc->sc_hostvar;
        struct txp_cmd_desc *cmd;
        struct txp_ext_desc *ext;
        u_int32_t idx, i;
        u_int16_t seq;

        if (txp_cmd_desc_numfree(sc) < (in_extn + 1)) {
                if_printf(&sc->sc_arpcom.ac_if, "no free cmd descriptors\n");
                return (-1);
        }

        idx = sc->sc_cmdring.lastwrite;
        cmd = (struct txp_cmd_desc *)(((u_int8_t *)sc->sc_cmdring.base) + idx);
        bzero(cmd, sizeof(*cmd));

        cmd->cmd_numdesc = in_extn;
        cmd->cmd_seq = seq = sc->sc_seq++;
        cmd->cmd_id = id;
        cmd->cmd_par1 = in1;
        cmd->cmd_par2 = in2;
        cmd->cmd_par3 = in3;
        cmd->cmd_flags = CMD_FLAGS_TYPE_CMD |
            (wait ? CMD_FLAGS_RESP : 0) | CMD_FLAGS_VALID;

        idx += sizeof(struct txp_cmd_desc);
        if (idx == sc->sc_cmdring.size)
                idx = 0;

        for (i = 0; i < in_extn; i++) {
                ext = (struct txp_ext_desc *)(((u_int8_t *)sc->sc_cmdring.base) + idx);
                bcopy(in_extp, ext, sizeof(struct txp_ext_desc));
                in_extp++;
                idx += sizeof(struct txp_cmd_desc);
                if (idx == sc->sc_cmdring.size)
                        idx = 0;
        }

        sc->sc_cmdring.lastwrite = idx;

        WRITE_REG(sc, TXP_H2A_2, sc->sc_cmdring.lastwrite);

        if (!wait)
                return (0);

        for (i = 0; i < 10000; i++) {
                idx = hv->hv_resp_read_idx;
                if (idx != hv->hv_resp_write_idx) {
                        *rspp = NULL;
                        if (txp_response(sc, idx, id, seq, rspp))
                                return (-1);
                        if (*rspp != NULL)
                                break;
                }
                DELAY(50);
        }
        if (i == 1000 || (*rspp) == NULL) {
                if_printf(&sc->sc_arpcom.ac_if, "0x%x command failed\n", id);
                return (-1);
        }

        return (0);
}

static int
txp_response(struct txp_softc *sc, u_int32_t ridx, u_int16_t id, u_int16_t seq,
             struct txp_rsp_desc **rspp)
{
        struct txp_hostvar *hv = sc->sc_hostvar;
        struct txp_rsp_desc *rsp;

        while (ridx != hv->hv_resp_write_idx) {
                rsp = (struct txp_rsp_desc *)(((u_int8_t *)sc->sc_rspring.base) + ridx);

                if (id == rsp->rsp_id && rsp->rsp_seq == seq) {
                        *rspp = (struct txp_rsp_desc *)kmalloc(
                            sizeof(struct txp_rsp_desc) * (rsp->rsp_numdesc + 1),
                            M_DEVBUF, M_INTWAIT);
                        if ((*rspp) == NULL)
                                return (-1);
                        txp_rsp_fixup(sc, rsp, *rspp);
                        return (0);
                }

                if (rsp->rsp_flags & RSP_FLAGS_ERROR) {
                        if_printf(&sc->sc_arpcom.ac_if, "response error!\n");
                        txp_rsp_fixup(sc, rsp, NULL);
                        ridx = hv->hv_resp_read_idx;
                        continue;
                }

                switch (rsp->rsp_id) {
                case TXP_CMD_CYCLE_STATISTICS:
                case TXP_CMD_MEDIA_STATUS_READ:
                        break;
                case TXP_CMD_HELLO_RESPONSE:
                        if_printf(&sc->sc_arpcom.ac_if, "hello\n");
                        break;
                default:
                        if_printf(&sc->sc_arpcom.ac_if, "unknown id(0x%x)\n",
                            rsp->rsp_id);
                }

                txp_rsp_fixup(sc, rsp, NULL);
                ridx = hv->hv_resp_read_idx;
                hv->hv_resp_read_idx = ridx;
        }

        return (0);
}

static void
txp_rsp_fixup(struct txp_softc *sc, struct txp_rsp_desc *rsp,
              struct txp_rsp_desc *dst)
{
        struct txp_rsp_desc *src = rsp;
        struct txp_hostvar *hv = sc->sc_hostvar;
        u_int32_t i, ridx;

        ridx = hv->hv_resp_read_idx;

        for (i = 0; i < rsp->rsp_numdesc + 1; i++) {
                if (dst != NULL)
                        bcopy(src, dst++, sizeof(struct txp_rsp_desc));
                ridx += sizeof(struct txp_rsp_desc);
                if (ridx == sc->sc_rspring.size) {
                        src = sc->sc_rspring.base;
                        ridx = 0;
                } else
                        src++;
                sc->sc_rspring.lastwrite = hv->hv_resp_read_idx = ridx;
        }
        
        hv->hv_resp_read_idx = ridx;
}

static int
txp_cmd_desc_numfree(struct txp_softc *sc)
{
        struct txp_hostvar *hv = sc->sc_hostvar;
        struct txp_boot_record *br = sc->sc_boot;
        u_int32_t widx, ridx, nfree;

        widx = sc->sc_cmdring.lastwrite;
        ridx = hv->hv_cmd_read_idx;

        if (widx == ridx) {
                /* Ring is completely free */
                nfree = br->br_cmd_siz - sizeof(struct txp_cmd_desc);
        } else {
                if (widx > ridx)
                        nfree = br->br_cmd_siz -
                            (widx - ridx + sizeof(struct txp_cmd_desc));
                else
                        nfree = ridx - widx - sizeof(struct txp_cmd_desc);
        }

        return (nfree / sizeof(struct txp_cmd_desc));
}

static void
txp_stop(struct txp_softc *sc)
{
        struct ifnet *ifp;

        ifp = &sc->sc_arpcom.ac_if;

        ifp->if_flags &= ~IFF_RUNNING;
        ifq_clr_oactive(&ifp->if_snd);

        callout_stop(&sc->txp_stat_timer);

        txp_command(sc, TXP_CMD_TX_DISABLE, 0, 0, 0, NULL, NULL, NULL, 1);
        txp_command(sc, TXP_CMD_RX_DISABLE, 0, 0, 0, NULL, NULL, NULL, 1);

        txp_rxring_empty(sc);

        return;
}

static void
txp_watchdog(struct ifnet *ifp)
{
        return;
}

static int
txp_ifmedia_upd(struct ifnet *ifp)
{
        struct txp_softc *sc = ifp->if_softc;
        struct ifmedia *ifm = &sc->sc_ifmedia;
        u_int16_t new_xcvr;

        if (IFM_TYPE(ifm->ifm_media) != IFM_ETHER)
                return (EINVAL);

        if (IFM_SUBTYPE(ifm->ifm_media) == IFM_10_T) {
                if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX)
                        new_xcvr = TXP_XCVR_10_FDX;
                else
                        new_xcvr = TXP_XCVR_10_HDX;
        } else if (IFM_SUBTYPE(ifm->ifm_media) == IFM_100_TX) {
                if ((ifm->ifm_media & IFM_GMASK) == IFM_FDX)
                        new_xcvr = TXP_XCVR_100_FDX;
                else
                        new_xcvr = TXP_XCVR_100_HDX;
        } else if (IFM_SUBTYPE(ifm->ifm_media) == IFM_AUTO) {
                new_xcvr = TXP_XCVR_AUTO;
        } else
                return (EINVAL);

        /* nothing to do */
        if (sc->sc_xcvr == new_xcvr)
                return (0);

        txp_command(sc, TXP_CMD_XCVR_SELECT, new_xcvr, 0, 0,
            NULL, NULL, NULL, 0);
        sc->sc_xcvr = new_xcvr;

        return (0);
}

static void
txp_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
{
        struct txp_softc *sc = ifp->if_softc;
        struct ifmedia *ifm = &sc->sc_ifmedia;
        u_int16_t bmsr, bmcr, anlpar;

        ifmr->ifm_status = IFM_AVALID;
        ifmr->ifm_active = IFM_ETHER;

        if (txp_command(sc, TXP_CMD_PHY_MGMT_READ, 0, MII_BMSR, 0,
            &bmsr, NULL, NULL, 1))
                goto bail;
        if (txp_command(sc, TXP_CMD_PHY_MGMT_READ, 0, MII_BMSR, 0,
            &bmsr, NULL, NULL, 1))
                goto bail;

        if (txp_command(sc, TXP_CMD_PHY_MGMT_READ, 0, MII_BMCR, 0,
            &bmcr, NULL, NULL, 1))
                goto bail;

        if (txp_command(sc, TXP_CMD_PHY_MGMT_READ, 0, MII_ANLPAR, 0,
            &anlpar, NULL, NULL, 1))
                goto bail;

        if (bmsr & BMSR_LINK)
                ifmr->ifm_status |= IFM_ACTIVE;

        if (bmcr & BMCR_ISO) {
                ifmr->ifm_active |= IFM_NONE;
                ifmr->ifm_status = 0;
                return;
        }

        if (bmcr & BMCR_LOOP)
                ifmr->ifm_active |= IFM_LOOP;

        if (bmcr & BMCR_AUTOEN) {
                if ((bmsr & BMSR_ACOMP) == 0) {
                        ifmr->ifm_active |= IFM_NONE;
                        return;
                }

                if (anlpar & ANLPAR_T4)
                        ifmr->ifm_active |= IFM_100_T4;
                else if (anlpar & ANLPAR_TX_FD)
                        ifmr->ifm_active |= IFM_100_TX|IFM_FDX;
                else if (anlpar & ANLPAR_TX)
                        ifmr->ifm_active |= IFM_100_TX;
                else if (anlpar & ANLPAR_10_FD)
                        ifmr->ifm_active |= IFM_10_T|IFM_FDX;
                else if (anlpar & ANLPAR_10)
                        ifmr->ifm_active |= IFM_10_T;
                else
                        ifmr->ifm_active |= IFM_NONE;
        } else
                ifmr->ifm_active = ifm->ifm_cur->ifm_media;
        return;

bail:
        ifmr->ifm_active |= IFM_NONE;
        ifmr->ifm_status &= ~IFM_AVALID;
}

#ifdef TXP_DEBUG
static void
txp_show_descriptor(void *d)
{
        struct txp_cmd_desc *cmd = d;
        struct txp_rsp_desc *rsp = d;
        struct txp_tx_desc *txd = d;
        struct txp_frag_desc *frgd = d;

        switch (cmd->cmd_flags & CMD_FLAGS_TYPE_M) {
        case CMD_FLAGS_TYPE_CMD:
                /* command descriptor */
                kprintf("[cmd flags 0x%x num %d id %d seq %d par1 0x%x par2 0x%x par3 0x%x]\n",
                    cmd->cmd_flags, cmd->cmd_numdesc, cmd->cmd_id, cmd->cmd_seq,
                    cmd->cmd_par1, cmd->cmd_par2, cmd->cmd_par3);
                break;
        case CMD_FLAGS_TYPE_RESP:
                /* response descriptor */
                kprintf("[rsp flags 0x%x num %d id %d seq %d par1 0x%x par2 0x%x par3 0x%x]\n",
                    rsp->rsp_flags, rsp->rsp_numdesc, rsp->rsp_id, rsp->rsp_seq,
                    rsp->rsp_par1, rsp->rsp_par2, rsp->rsp_par3);
                break;
        case CMD_FLAGS_TYPE_DATA:
                /* data header (assuming tx for now) */
                kprintf("[data flags 0x%x num %d totlen %d addr 0x%x/0x%x pflags 0x%x]",
                    txd->tx_flags, txd->tx_numdesc, txd->tx_totlen,
                    txd->tx_addrlo, txd->tx_addrhi, txd->tx_pflags);
                break;
        case CMD_FLAGS_TYPE_FRAG:
                /* fragment descriptor */
                kprintf("[frag flags 0x%x rsvd1 0x%x len %d addr 0x%x/0x%x rsvd2 0x%x]",
                    frgd->frag_flags, frgd->frag_rsvd1, frgd->frag_len,
                    frgd->frag_addrlo, frgd->frag_addrhi, frgd->frag_rsvd2);
                break;
        default:
                kprintf("[unknown(%x) flags 0x%x num %d id %d seq %d par1 0x%x par2 0x%x par3 0x%x]\n",
                    cmd->cmd_flags & CMD_FLAGS_TYPE_M,
                    cmd->cmd_flags, cmd->cmd_numdesc, cmd->cmd_id, cmd->cmd_seq,
                    cmd->cmd_par1, cmd->cmd_par2, cmd->cmd_par3);
                break;
        }
}
#endif

static void
txp_set_filter(struct txp_softc *sc)
{
        struct ifnet *ifp = &sc->sc_arpcom.ac_if;
        uint16_t filter;
        struct ifmultiaddr *ifma;

        if (ifp->if_flags & IFF_PROMISC) {
                filter = TXP_RXFILT_PROMISC;
                goto setit;
        }

        filter = TXP_RXFILT_DIRECT;

        if (ifp->if_flags & IFF_BROADCAST)
                filter |= TXP_RXFILT_BROADCAST;

        if (ifp->if_flags & IFF_ALLMULTI) {
                filter |= TXP_RXFILT_ALLMULTI;
        } else {
                uint32_t hashbit, hash[2];
                int mcnt = 0;

                hash[0] = hash[1] = 0;

                TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
                        if (ifma->ifma_addr->sa_family != AF_LINK)
                                continue;

                        mcnt++;
                        hashbit = (uint16_t)(ether_crc32_be(
                            LLADDR((struct sockaddr_dl *)ifma->ifma_addr),
                            ETHER_ADDR_LEN) & (64 - 1));
                        hash[hashbit / 32] |= (1 << hashbit % 32);
                }

                if (mcnt > 0) {
                        filter |= TXP_RXFILT_HASHMULTI;
                        txp_command(sc, TXP_CMD_MCAST_HASH_MASK_WRITE,
                            2, hash[0], hash[1], NULL, NULL, NULL, 0);
                }
        }

setit:
        txp_command(sc, TXP_CMD_RX_FILTER_WRITE, filter, 0, 0,
            NULL, NULL, NULL, 1);
}

static void
txp_capabilities(struct txp_softc *sc)
{
        struct ifnet *ifp = &sc->sc_arpcom.ac_if;
        struct txp_rsp_desc *rsp = NULL;
        struct txp_ext_desc *ext;

        if (txp_command2(sc, TXP_CMD_OFFLOAD_READ, 0, 0, 0, NULL, 0, &rsp, 1))
                goto out;

        if (rsp->rsp_numdesc != 1)
                goto out;
        ext = (struct txp_ext_desc *)(rsp + 1);

        sc->sc_tx_capability = ext->ext_1 & OFFLOAD_MASK;
        sc->sc_rx_capability = ext->ext_2 & OFFLOAD_MASK;
        ifp->if_capabilities = 0;

        if (rsp->rsp_par2 & rsp->rsp_par3 & OFFLOAD_VLAN) {
                sc->sc_tx_capability |= OFFLOAD_VLAN;
                sc->sc_rx_capability |= OFFLOAD_VLAN;
                ifp->if_capabilities |= IFCAP_VLAN_HWTAGGING;
        }

#if 0
        /* not ready yet */
        if (rsp->rsp_par2 & rsp->rsp_par3 & OFFLOAD_IPSEC) {
                sc->sc_tx_capability |= OFFLOAD_IPSEC;
                sc->sc_rx_capability |= OFFLOAD_IPSEC;
                ifp->if_capabilities |= IFCAP_IPSEC;
        }
#endif

        if (rsp->rsp_par2 & rsp->rsp_par3 & OFFLOAD_IPCKSUM) {
                sc->sc_tx_capability |= OFFLOAD_IPCKSUM;
                sc->sc_rx_capability |= OFFLOAD_IPCKSUM;
                ifp->if_capabilities |= IFCAP_HWCSUM;
                ifp->if_hwassist |= CSUM_IP;
        }

        if (rsp->rsp_par2 & rsp->rsp_par3 & OFFLOAD_TCPCKSUM) {
#if 0
                sc->sc_tx_capability |= OFFLOAD_TCPCKSUM;
#endif
                sc->sc_rx_capability |= OFFLOAD_TCPCKSUM;
                ifp->if_capabilities |= IFCAP_HWCSUM;
        }

        if (rsp->rsp_par2 & rsp->rsp_par3 & OFFLOAD_UDPCKSUM) {
#if 0
                sc->sc_tx_capability |= OFFLOAD_UDPCKSUM;
#endif
                sc->sc_rx_capability |= OFFLOAD_UDPCKSUM;
                ifp->if_capabilities |= IFCAP_HWCSUM;
        }
        ifp->if_capenable = ifp->if_capabilities;

        if (txp_command(sc, TXP_CMD_OFFLOAD_WRITE, 0,
            sc->sc_tx_capability, sc->sc_rx_capability, NULL, NULL, NULL, 1))
                goto out;

out:
        if (rsp != NULL)
                kfree(rsp, M_DEVBUF);

        return;
}