/*      $OpenBSD: if_aue.c,v 1.113 2024/05/23 03:21:08 jsg Exp $ */
/*      $NetBSD: if_aue.c,v 1.82 2003/03/05 17:37:36 shiba Exp $        */
/*
 * Copyright (c) 1997, 1998, 1999, 2000
 *      Bill Paul <wpaul@ee.columbia.edu>.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Bill Paul.
 * 4. Neither the name of the author nor the names of any co-contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR THE VOICES IN HIS HEAD
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD: src/sys/dev/usb/if_aue.c,v 1.11 2000/01/14 01:36:14 wpaul Exp $
 */

/*
 * ADMtek AN986 Pegasus and AN8511 Pegasus II USB to ethernet driver.
 * Datasheet is available from http://www.admtek.com.tw.
 *
 * Written by Bill Paul <wpaul@ee.columbia.edu>
 * Electrical Engineering Department
 * Columbia University, New York City
 */

/*
 * The Pegasus chip uses four USB "endpoints" to provide 10/100 ethernet
 * support: the control endpoint for reading/writing registers, burst
 * read endpoint for packet reception, burst write for packet transmission
 * and one for "interrupts." The chip uses the same RX filter scheme
 * as the other ADMtek ethernet parts: one perfect filter entry for the
 * the station address and a 64-bit multicast hash table. The chip supports
 * both MII and HomePNA attachments.
 *
 * Since the maximum data transfer speed of USB is supposed to be 12Mbps,
 * you're never really going to get 100Mbps speeds from this device. I
 * think the idea is to allow the device to connect to 10 or 100Mbps
 * networks, not necessarily to provide 100Mbps performance. Also, since
 * the controller uses an external PHY chip, it's possible that board
 * designers might simply choose a 10Mbps PHY.
 *
 * Registers are accessed using usbd_do_request(). Packet transfers are
 * done using usbd_transfer() and friends.
 */

/*
 * Ported to NetBSD and somewhat rewritten by Lennart Augustsson.
 */

/*
 * TODO:
 * better error messages from rxstat
 * split out if_auevar.h
 * add thread to avoid register reads from interrupt context
 * more error checks
 * investigate short rx problem
 * proper cleanup on errors
 */

#include "bpfilter.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/rwlock.h>
#include <sys/mbuf.h>

#include <sys/device.h>

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

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

#include <netinet/in.h>
#include <netinet/if_ether.h>

#include <dev/mii/miivar.h>

#include <dev/usb/usb.h>
#include <dev/usb/usbdi.h>
#include <dev/usb/usbdi_util.h>
#include <dev/usb/usbdevs.h>

#include <dev/usb/if_auereg.h>

#ifdef AUE_DEBUG
#define DPRINTF(x)      do { if (auedebug) printf x; } while (0)
#define DPRINTFN(n,x)   do { if (auedebug >= (n)) printf x; } while (0)
int     auedebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

/*
 * Various supported device vendors/products.
 */
struct aue_type {
        struct usb_devno        aue_dev;
        u_int16_t               aue_flags;
#define LSYS    0x0001          /* use Linksys reset */
#define PNA     0x0002          /* has Home PNA */
#define PII     0x0004          /* Pegasus II chip */
};

const struct aue_type aue_devs[] = {
 {{ USB_VENDOR_3COM,            USB_PRODUCT_3COM_3C460B},         PII },
 {{ USB_VENDOR_ABOCOM,          USB_PRODUCT_ABOCOM_XX1},          PNA|PII },
 {{ USB_VENDOR_ABOCOM,          USB_PRODUCT_ABOCOM_XX2},          PII },
 {{ USB_VENDOR_ABOCOM,          USB_PRODUCT_ABOCOM_UFE1000},      LSYS },
 {{ USB_VENDOR_ABOCOM,          USB_PRODUCT_ABOCOM_XX4},          PNA },
 {{ USB_VENDOR_ABOCOM,          USB_PRODUCT_ABOCOM_XX5},          PNA },
 {{ USB_VENDOR_ABOCOM,          USB_PRODUCT_ABOCOM_XX6},          PII },
 {{ USB_VENDOR_ABOCOM,          USB_PRODUCT_ABOCOM_XX7},          PII },
 {{ USB_VENDOR_ABOCOM,          USB_PRODUCT_ABOCOM_XX8},          PII },
 {{ USB_VENDOR_ABOCOM,          USB_PRODUCT_ABOCOM_XX9},          PNA },
 {{ USB_VENDOR_ABOCOM,          USB_PRODUCT_ABOCOM_XX10},         0 },
 {{ USB_VENDOR_ABOCOM,          USB_PRODUCT_ABOCOM_DSB650TX_PNA}, 0 },
 {{ USB_VENDOR_ACCTON,          USB_PRODUCT_ACCTON_USB320_EC},    0 },
 {{ USB_VENDOR_ACCTON,          USB_PRODUCT_ACCTON_SS1001},       PII },
 {{ USB_VENDOR_ADMTEK,          USB_PRODUCT_ADMTEK_PEGASUS},      PNA },
 {{ USB_VENDOR_ADMTEK,          USB_PRODUCT_ADMTEK_PEGASUSII},    PII },
 {{ USB_VENDOR_ADMTEK,          USB_PRODUCT_ADMTEK_PEGASUSII_2},  PII },
 {{ USB_VENDOR_ADMTEK,          USB_PRODUCT_ADMTEK_PEGASUSII_3},  PII },
 {{ USB_VENDOR_ADMTEK,          USB_PRODUCT_ADMTEK_PEGASUSII_4},  PII },
 {{ USB_VENDOR_AEI,             USB_PRODUCT_AEI_FASTETHERNET},    PII },
 {{ USB_VENDOR_ALLIEDTELESYN,   USB_PRODUCT_ALLIEDTELESYN_ATUSB100}, PII },
 {{ USB_VENDOR_ATEN,            USB_PRODUCT_ATEN_UC110T},         PII },
 {{ USB_VENDOR_BELKIN,          USB_PRODUCT_BELKIN_F5D5050},      PII },
 {{ USB_VENDOR_BILLIONTON,      USB_PRODUCT_BILLIONTON_USB100},   0 },
 {{ USB_VENDOR_BILLIONTON,      USB_PRODUCT_BILLIONTON_USBLP100}, PNA },
 {{ USB_VENDOR_BILLIONTON,      USB_PRODUCT_BILLIONTON_USBEL100}, 0 },
 {{ USB_VENDOR_BILLIONTON,      USB_PRODUCT_BILLIONTON_USBE100},  PII },
 {{ USB_VENDOR_COREGA,          USB_PRODUCT_COREGA_FETHER_USB_TX}, 0 },
 {{ USB_VENDOR_COREGA,          USB_PRODUCT_COREGA_FETHER_USB_TXS},PII },
 {{ USB_VENDOR_DLINK,           USB_PRODUCT_DLINK_DSB650TX4},     LSYS|PII },
 {{ USB_VENDOR_DLINK,           USB_PRODUCT_DLINK_DSB650TX1},     LSYS },
 {{ USB_VENDOR_DLINK,           USB_PRODUCT_DLINK_DSB650TX},      LSYS },
 {{ USB_VENDOR_DLINK,           USB_PRODUCT_DLINK_DSB650TX_PNA},  PNA },
 {{ USB_VENDOR_DLINK,           USB_PRODUCT_DLINK_DSB650TX3},     LSYS|PII },
 {{ USB_VENDOR_DLINK,           USB_PRODUCT_DLINK_DSB650TX2},     LSYS|PII },
 {{ USB_VENDOR_DLINK,           USB_PRODUCT_DLINK_DSB650},        0 },
 {{ USB_VENDOR_ELCON,           USB_PRODUCT_ELCON_PLAN},          PNA|PII },
 {{ USB_VENDOR_ELECOM,          USB_PRODUCT_ELECOM_LDUSB20},      PII },
 {{ USB_VENDOR_ELECOM,          USB_PRODUCT_ELECOM_LDUSBTX0},     0 },
 {{ USB_VENDOR_ELECOM,          USB_PRODUCT_ELECOM_LDUSBTX1},     LSYS },
 {{ USB_VENDOR_ELECOM,          USB_PRODUCT_ELECOM_LDUSBTX2},     0 },
 {{ USB_VENDOR_ELECOM,          USB_PRODUCT_ELECOM_LDUSBTX3},     LSYS },
 {{ USB_VENDOR_ELECOM,          USB_PRODUCT_ELECOM_LDUSBLTX},     PII },
 {{ USB_VENDOR_ELSA,            USB_PRODUCT_ELSA_USB2ETHERNET},   0 },
 {{ USB_VENDOR_GIGABYTE,        USB_PRODUCT_GIGABYTE_GNBR402W},   0 },
 {{ USB_VENDOR_HAWKING,         USB_PRODUCT_HAWKING_UF100},       PII },
 {{ USB_VENDOR_HP,              USB_PRODUCT_HP_HN210E},           PII },
 {{ USB_VENDOR_IODATA,          USB_PRODUCT_IODATA_USBETTX},      0 },
 {{ USB_VENDOR_IODATA,          USB_PRODUCT_IODATA_USBETTXS},     PII },
 {{ USB_VENDOR_IODATA,          USB_PRODUCT_IODATA_ETXUS2},       PII },
 {{ USB_VENDOR_KINGSTON,        USB_PRODUCT_KINGSTON_KNU101TX},   0 },
 {{ USB_VENDOR_LINKSYS,         USB_PRODUCT_LINKSYS_USB10TX1},    LSYS|PII },
 {{ USB_VENDOR_LINKSYS,         USB_PRODUCT_LINKSYS_USB10T},      LSYS },
 {{ USB_VENDOR_LINKSYS,         USB_PRODUCT_LINKSYS_USB100TX},    LSYS },
 {{ USB_VENDOR_LINKSYS,         USB_PRODUCT_LINKSYS_USB100H1},    LSYS|PNA },
 {{ USB_VENDOR_LINKSYS,         USB_PRODUCT_LINKSYS_USB10TA},     LSYS },
 {{ USB_VENDOR_LINKSYS,         USB_PRODUCT_LINKSYS_USB10TX2},    LSYS|PII },
 {{ USB_VENDOR_MICROSOFT,       USB_PRODUCT_MICROSOFT_MN110},     PII },
 {{ USB_VENDOR_MELCO,           USB_PRODUCT_MELCO_LUATX1},        0 },
 {{ USB_VENDOR_MELCO,           USB_PRODUCT_MELCO_LUATX5},        0 },
 {{ USB_VENDOR_MELCO,           USB_PRODUCT_MELCO_LUA2TX5},       PII },
 {{ USB_VENDOR_MOBILITY,        USB_PRODUCT_MOBILITY_EASIDOCK},   0 },
 {{ USB_VENDOR_NETGEAR,         USB_PRODUCT_NETGEAR_FA101},       PII },
 {{ USB_VENDOR_OCT,             USB_PRODUCT_OCT_USBTOETHER},      PII },
 {{ USB_VENDOR_SIEMENS,         USB_PRODUCT_SIEMENS_SPEEDSTREAM}, PII },
 {{ USB_VENDOR_SMARTBRIDGES,    USB_PRODUCT_SMARTBRIDGES_SMARTNIC},PII },
 {{ USB_VENDOR_SMC,             USB_PRODUCT_SMC_2202USB},         0 },
 {{ USB_VENDOR_SMC,             USB_PRODUCT_SMC_2206USB},         PII },
 {{ USB_VENDOR_SOHOWARE,        USB_PRODUCT_SOHOWARE_NUB100},     0 },
 {{ USB_VENDOR_SOHOWARE,        USB_PRODUCT_SOHOWARE_NUB110},     PII },
 {{ USB_VENDOR_LOGITEC,         USB_PRODUCT_LOGITEC_LANTX},       PII },
};
#define aue_lookup(v, p) ((struct aue_type *)usb_lookup(aue_devs, v, p))

int aue_match(struct device *, void *, void *);
void aue_attach(struct device *, struct device *, void *);
int aue_detach(struct device *, int);

struct cfdriver aue_cd = {
        NULL, "aue", DV_IFNET
};

const struct cfattach aue_ca = {
        sizeof(struct aue_softc), aue_match, aue_attach, aue_detach
};

void aue_reset_pegasus_II(struct aue_softc *sc);
int aue_tx_list_init(struct aue_softc *);
int aue_rx_list_init(struct aue_softc *);
int aue_newbuf(struct aue_softc *, struct aue_chain *, struct mbuf *);
int aue_send(struct aue_softc *, struct mbuf *, int);
void aue_intr(struct usbd_xfer *, void *, usbd_status);
void aue_rxeof(struct usbd_xfer *, void *, usbd_status);
void aue_txeof(struct usbd_xfer *, void *, usbd_status);
void aue_tick(void *);
void aue_tick_task(void *);
void aue_start(struct ifnet *);
int aue_ioctl(struct ifnet *, u_long, caddr_t);
void aue_init(void *);
void aue_stop(struct aue_softc *);
void aue_watchdog(struct ifnet *);
int aue_openpipes(struct aue_softc *);
int aue_ifmedia_upd(struct ifnet *);
void aue_ifmedia_sts(struct ifnet *, struct ifmediareq *);

int aue_eeprom_getword(struct aue_softc *, int);
void aue_read_mac(struct aue_softc *, u_char *);
int aue_miibus_readreg(struct device *, int, int);
void aue_miibus_writereg(struct device *, int, int, int);
void aue_miibus_statchg(struct device *);

void aue_lock_mii(struct aue_softc *);
void aue_unlock_mii(struct aue_softc *);

void aue_iff(struct aue_softc *);
u_int32_t aue_crc(caddr_t);
void aue_reset(struct aue_softc *);

int aue_csr_read_1(struct aue_softc *, int);
int aue_csr_write_1(struct aue_softc *, int, int);
int aue_csr_read_2(struct aue_softc *, int);
int aue_csr_write_2(struct aue_softc *, int, int);

#define AUE_SETBIT(sc, reg, x)                          \
        aue_csr_write_1(sc, reg, aue_csr_read_1(sc, reg) | (x))

#define AUE_CLRBIT(sc, reg, x)                          \
        aue_csr_write_1(sc, reg, aue_csr_read_1(sc, reg) & ~(x))

int
aue_csr_read_1(struct aue_softc *sc, int reg)
{
        usb_device_request_t    req;
        usbd_status             err;
        uByte                   val = 0;

        if (usbd_is_dying(sc->aue_udev))
                return (0);

        req.bmRequestType = UT_READ_VENDOR_DEVICE;
        req.bRequest = AUE_UR_READREG;
        USETW(req.wValue, 0);
        USETW(req.wIndex, reg);
        USETW(req.wLength, 1);

        err = usbd_do_request(sc->aue_udev, &req, &val);

        if (err) {
                DPRINTF(("%s: aue_csr_read_1: reg=0x%x err=%s\n",
                         sc->aue_dev.dv_xname, reg, usbd_errstr(err)));
                return (0);
        }

        return (val);
}

int
aue_csr_read_2(struct aue_softc *sc, int reg)
{
        usb_device_request_t    req;
        usbd_status             err;
        uWord                   val;

        if (usbd_is_dying(sc->aue_udev))
                return (0);

        req.bmRequestType = UT_READ_VENDOR_DEVICE;
        req.bRequest = AUE_UR_READREG;
        USETW(req.wValue, 0);
        USETW(req.wIndex, reg);
        USETW(req.wLength, 2);

        err = usbd_do_request(sc->aue_udev, &req, &val);

        if (err) {
                DPRINTF(("%s: aue_csr_read_2: reg=0x%x err=%s\n",
                         sc->aue_dev.dv_xname, reg, usbd_errstr(err)));
                return (0);
        }

        return (UGETW(val));
}

int
aue_csr_write_1(struct aue_softc *sc, int reg, int aval)
{
        usb_device_request_t    req;
        usbd_status             err;
        uByte                   val;

        if (usbd_is_dying(sc->aue_udev))
                return (0);

        val = aval;
        req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
        req.bRequest = AUE_UR_WRITEREG;
        USETW(req.wValue, val);
        USETW(req.wIndex, reg);
        USETW(req.wLength, 1);

        err = usbd_do_request(sc->aue_udev, &req, &val);

        if (err) {
                DPRINTF(("%s: aue_csr_write_1: reg=0x%x err=%s\n",
                         sc->aue_dev.dv_xname, reg, usbd_errstr(err)));
                return (-1);
        }

        return (0);
}

int
aue_csr_write_2(struct aue_softc *sc, int reg, int aval)
{
        usb_device_request_t    req;
        usbd_status             err;
        uWord                   val;

        if (usbd_is_dying(sc->aue_udev))
                return (0);

        USETW(val, aval);
        req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
        req.bRequest = AUE_UR_WRITEREG;
        USETW(req.wValue, aval);
        USETW(req.wIndex, reg);
        USETW(req.wLength, 2);

        err = usbd_do_request(sc->aue_udev, &req, &val);

        if (err) {
                DPRINTF(("%s: aue_csr_write_2: reg=0x%x err=%s\n",
                         sc->aue_dev.dv_xname, reg, usbd_errstr(err)));
                return (-1);
        }

        return (0);
}

/*
 * Read a word of data stored in the EEPROM at address 'addr.'
 */
int
aue_eeprom_getword(struct aue_softc *sc, int addr)
{
        int             i;

        aue_csr_write_1(sc, AUE_EE_REG, addr);
        aue_csr_write_1(sc, AUE_EE_CTL, AUE_EECTL_READ);

        for (i = 0; i < AUE_TIMEOUT; i++) {
                if (aue_csr_read_1(sc, AUE_EE_CTL) & AUE_EECTL_DONE)
                        break;
        }

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

        return (aue_csr_read_2(sc, AUE_EE_DATA));
}

/*
 * Read the MAC from the EEPROM.  It's at offset 0.
 */
void
aue_read_mac(struct aue_softc *sc, u_char *dest)
{
        int                     i;
        int                     off = 0;
        int                     word;

        DPRINTFN(5,("%s: %s: enter\n", sc->aue_dev.dv_xname, __func__));

        for (i = 0; i < 3; i++) {
                word = aue_eeprom_getword(sc, off + i);
                dest[2 * i] = (u_char)word;
                dest[2 * i + 1] = (u_char)(word >> 8);
        }
}

/* Get exclusive access to the MII registers */
void
aue_lock_mii(struct aue_softc *sc)
{
        sc->aue_refcnt++;
        rw_enter_write(&sc->aue_mii_lock);
}

void
aue_unlock_mii(struct aue_softc *sc)
{
        rw_exit_write(&sc->aue_mii_lock);
        if (--sc->aue_refcnt < 0)
                usb_detach_wakeup(&sc->aue_dev);
}

int
aue_miibus_readreg(struct device *dev, int phy, int reg)
{
        struct aue_softc        *sc = (void *)dev;
        int                     i;
        u_int16_t               val;

        if (usbd_is_dying(sc->aue_udev)) {
#ifdef DIAGNOSTIC
                printf("%s: dying\n", sc->aue_dev.dv_xname);
#endif
                return 0;
        }

#if 0
        /*
         * The Am79C901 HomePNA PHY actually contains
         * two transceivers: a 1Mbps HomePNA PHY and a
         * 10Mbps full/half duplex ethernet PHY with
         * NWAY autoneg. However in the ADMtek adapter,
         * only the 1Mbps PHY is actually connected to
         * anything, so we ignore the 10Mbps one. It
         * happens to be configured for MII address 3,
         * so we filter that out.
         */
        if (sc->aue_vendor == USB_VENDOR_ADMTEK &&
            sc->aue_product == USB_PRODUCT_ADMTEK_PEGASUS) {
                if (phy == 3)
                        return (0);
        }
#endif

        aue_lock_mii(sc);
        aue_csr_write_1(sc, AUE_PHY_ADDR, phy);
        aue_csr_write_1(sc, AUE_PHY_CTL, reg | AUE_PHYCTL_READ);

        for (i = 0; i < AUE_TIMEOUT; i++) {
                if (aue_csr_read_1(sc, AUE_PHY_CTL) & AUE_PHYCTL_DONE)
                        break;
        }

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

        val = aue_csr_read_2(sc, AUE_PHY_DATA);

        DPRINTFN(11,("%s: %s: phy=%d reg=%d => 0x%04x\n",
                     sc->aue_dev.dv_xname, __func__, phy, reg, val));

        aue_unlock_mii(sc);
        return (val);
}

void
aue_miibus_writereg(struct device *dev, int phy, int reg, int data)
{
        struct aue_softc        *sc = (void *)dev;
        int                     i;

#if 0
        if (sc->aue_vendor == USB_VENDOR_ADMTEK &&
            sc->aue_product == USB_PRODUCT_ADMTEK_PEGASUS) {
                if (phy == 3)
                        return;
        }
#endif

        DPRINTFN(11,("%s: %s: phy=%d reg=%d data=0x%04x\n",
                     sc->aue_dev.dv_xname, __func__, phy, reg, data));

        aue_lock_mii(sc);
        aue_csr_write_2(sc, AUE_PHY_DATA, data);
        aue_csr_write_1(sc, AUE_PHY_ADDR, phy);
        aue_csr_write_1(sc, AUE_PHY_CTL, reg | AUE_PHYCTL_WRITE);

        for (i = 0; i < AUE_TIMEOUT; i++) {
                if (aue_csr_read_1(sc, AUE_PHY_CTL) & AUE_PHYCTL_DONE)
                        break;
        }

        if (i == AUE_TIMEOUT) {
                printf("%s: MII write timed out\n",
                    sc->aue_dev.dv_xname);
        }
        aue_unlock_mii(sc);
}

void
aue_miibus_statchg(struct device *dev)
{
        struct aue_softc        *sc = (void *)dev;
        struct mii_data         *mii = GET_MII(sc);

        DPRINTFN(5,("%s: %s: enter\n", sc->aue_dev.dv_xname, __func__));

        aue_lock_mii(sc);
        AUE_CLRBIT(sc, AUE_CTL0, AUE_CTL0_RX_ENB | AUE_CTL0_TX_ENB);

        if (IFM_SUBTYPE(mii->mii_media_active) == IFM_100_TX) {
                AUE_SETBIT(sc, AUE_CTL1, AUE_CTL1_SPEEDSEL);
        } else {
                AUE_CLRBIT(sc, AUE_CTL1, AUE_CTL1_SPEEDSEL);
        }

        if ((mii->mii_media_active & IFM_GMASK) == IFM_FDX)
                AUE_SETBIT(sc, AUE_CTL1, AUE_CTL1_DUPLEX);
        else
                AUE_CLRBIT(sc, AUE_CTL1, AUE_CTL1_DUPLEX);

        AUE_SETBIT(sc, AUE_CTL0, AUE_CTL0_RX_ENB | AUE_CTL0_TX_ENB);
        aue_unlock_mii(sc);

        /*
         * Set the LED modes on the LinkSys adapter.
         * This turns on the 'dual link LED' bin in the auxmode
         * register of the Broadcom PHY.
         */
        if (!usbd_is_dying(sc->aue_udev) && (sc->aue_flags & LSYS)) {
                u_int16_t auxmode;
                auxmode = aue_miibus_readreg(dev, 0, 0x1b);
                aue_miibus_writereg(dev, 0, 0x1b, auxmode | 0x04);
        }
        DPRINTFN(5,("%s: %s: exit\n", sc->aue_dev.dv_xname, __func__));
}

#define AUE_POLY        0xEDB88320
#define AUE_BITS        6

u_int32_t
aue_crc(caddr_t addr)
{
        u_int32_t               idx, bit, data, crc;

        /* Compute CRC for the address value. */
        crc = 0xFFFFFFFF; /* initial value */

        for (idx = 0; idx < 6; idx++) {
                for (data = *addr++, bit = 0; bit < 8; bit++, data >>= 1)
                        crc = (crc >> 1) ^ (((crc ^ data) & 1) ? AUE_POLY : 0);
        }

        return (crc & ((1 << AUE_BITS) - 1));
}

void
aue_iff(struct aue_softc *sc)
{
        struct ifnet            *ifp = GET_IFP(sc);
        struct arpcom           *ac = &sc->arpcom;
        struct ether_multi      *enm;
        struct ether_multistep  step;
        u_int32_t               h = 0, i;

        DPRINTFN(5,("%s: %s: enter\n", sc->aue_dev.dv_xname, __func__));

        AUE_CLRBIT(sc, AUE_CTL0, AUE_CTL0_ALLMULTI);
        AUE_CLRBIT(sc, AUE_CTL2, AUE_CTL2_RX_PROMISC);
        ifp->if_flags &= ~IFF_ALLMULTI;

        if (ifp->if_flags & IFF_PROMISC || ac->ac_multirangecnt > 0) {
                ifp->if_flags |= IFF_ALLMULTI;
                AUE_SETBIT(sc, AUE_CTL0, AUE_CTL0_ALLMULTI);
                if (ifp->if_flags & IFF_PROMISC)
                        AUE_SETBIT(sc, AUE_CTL2, AUE_CTL2_RX_PROMISC);
        } else {
                /* first, zot all the existing hash bits */
                for (i = 0; i < 8; i++)
                        aue_csr_write_1(sc, AUE_MAR0 + i, 0);

                /* now program new ones */
                ETHER_FIRST_MULTI(step, ac, enm);
                while (enm != NULL) {
                        h = aue_crc(enm->enm_addrlo);

                        AUE_SETBIT(sc, AUE_MAR + (h >> 3), 1 << (h & 0x7));

                        ETHER_NEXT_MULTI(step, enm);
                }
        }
}

void
aue_reset_pegasus_II(struct aue_softc *sc)
{
        /* Magic constants taken from Linux driver. */
        aue_csr_write_1(sc, AUE_REG_1D, 0);
        aue_csr_write_1(sc, AUE_REG_7B, 2);
#if 0
        if ((sc->aue_flags & HAS_HOME_PNA) && mii_mode)
                aue_csr_write_1(sc, AUE_REG_81, 6);
        else
#endif
                aue_csr_write_1(sc, AUE_REG_81, 2);
}

void
aue_reset(struct aue_softc *sc)
{
        int             i;

        DPRINTFN(2,("%s: %s: enter\n", sc->aue_dev.dv_xname, __func__));

        AUE_SETBIT(sc, AUE_CTL1, AUE_CTL1_RESETMAC);

        for (i = 0; i < AUE_TIMEOUT; i++) {
                if (!(aue_csr_read_1(sc, AUE_CTL1) & AUE_CTL1_RESETMAC))
                        break;
        }

        if (i == AUE_TIMEOUT)
                printf("%s: reset failed\n", sc->aue_dev.dv_xname);

#if 0
        /* XXX what is mii_mode supposed to be */
        if (sc->aue_mii_mode && (sc->aue_flags & PNA))
                aue_csr_write_1(sc, AUE_GPIO1, 0x34);
        else
                aue_csr_write_1(sc, AUE_GPIO1, 0x26);
#endif

        /*
         * The PHY(s) attached to the Pegasus chip may be held
         * in reset until we flip on the GPIO outputs. Make sure
         * to set the GPIO pins high so that the PHY(s) will
         * be enabled.
         *
         * Note: We force all of the GPIO pins low first, *then*
         * enable the ones we want.
         */
        if (sc->aue_flags & LSYS) {
                /* Grrr. LinkSys has to be different from everyone else. */
                aue_csr_write_1(sc, AUE_GPIO0,
                    AUE_GPIO_SEL0 | AUE_GPIO_SEL1);
        } else {
                aue_csr_write_1(sc, AUE_GPIO0,
                    AUE_GPIO_OUT0 | AUE_GPIO_SEL0);
        }
        aue_csr_write_1(sc, AUE_GPIO0,
            AUE_GPIO_OUT0 | AUE_GPIO_SEL0 | AUE_GPIO_SEL1);

        if (sc->aue_flags & PII)
                aue_reset_pegasus_II(sc);

        /* Wait a little while for the chip to get its brains in order. */
        delay(10000);           /* XXX */
}

/*
 * Probe for a Pegasus chip.
 */
int
aue_match(struct device *parent, void *match, void *aux)
{
        struct usb_attach_arg   *uaa = aux;

        if (uaa->iface == NULL || uaa->configno != 1)
                return (UMATCH_NONE);

        return (aue_lookup(uaa->vendor, uaa->product) != NULL ?
                UMATCH_VENDOR_PRODUCT_CONF_IFACE : UMATCH_NONE);
}

/*
 * Attach the interface. Allocate softc structures, do ifmedia
 * setup and ethernet/BPF attach.
 */
void
aue_attach(struct device *parent, struct device *self, void *aux)
{
        struct aue_softc        *sc = (struct aue_softc *)self;
        struct usb_attach_arg   *uaa = aux;
        int                     s;
        u_char                  eaddr[ETHER_ADDR_LEN];
        struct ifnet            *ifp;
        struct mii_data         *mii;
        struct usbd_device      *dev = uaa->device;
        struct usbd_interface   *iface = uaa->iface;
        usb_interface_descriptor_t      *id;
        usb_endpoint_descriptor_t       *ed;
        int                     i;

        DPRINTFN(5,(" : aue_attach: sc=%p", sc));

        sc->aue_udev = dev;

        usb_init_task(&sc->aue_tick_task, aue_tick_task, sc,
            USB_TASK_TYPE_GENERIC);
        usb_init_task(&sc->aue_stop_task, (void (*)(void *))aue_stop, sc,
            USB_TASK_TYPE_GENERIC);
        rw_init(&sc->aue_mii_lock, "auemii");

        sc->aue_flags = aue_lookup(uaa->vendor, uaa->product)->aue_flags;

        sc->aue_iface = iface;
        sc->aue_product = uaa->product;
        sc->aue_vendor = uaa->vendor;

        id = usbd_get_interface_descriptor(iface);

        /* Find endpoints. */
        for (i = 0; i < id->bNumEndpoints; i++) {
                ed = usbd_interface2endpoint_descriptor(iface, i);
                if (ed == NULL) {
                        printf("%s: couldn't get endpoint descriptor %d\n",
                            sc->aue_dev.dv_xname, i);
                        return;
                }
                if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
                    UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
                        sc->aue_ed[AUE_ENDPT_RX] = ed->bEndpointAddress;
                } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
                           UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
                        sc->aue_ed[AUE_ENDPT_TX] = ed->bEndpointAddress;
                } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
                           UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT) {
                        sc->aue_ed[AUE_ENDPT_INTR] = ed->bEndpointAddress;
                }
        }

        if (sc->aue_ed[AUE_ENDPT_RX] == 0 || sc->aue_ed[AUE_ENDPT_TX] == 0 ||
            sc->aue_ed[AUE_ENDPT_INTR] == 0) {
                printf("%s: missing endpoint\n", sc->aue_dev.dv_xname);
                return;
        }


        s = splnet();

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

        /*
         * Get station address from the EEPROM.
         */
        aue_read_mac(sc, eaddr);

        /*
         * A Pegasus chip was detected. Inform the world.
         */
        ifp = GET_IFP(sc);
        printf("%s: address %s\n", sc->aue_dev.dv_xname,
            ether_sprintf(eaddr));

        bcopy(eaddr, (char *)&sc->arpcom.ac_enaddr, ETHER_ADDR_LEN);

        /* Initialize interface info.*/
        ifp->if_softc = sc;
        ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
        ifp->if_ioctl = aue_ioctl;
        ifp->if_start = aue_start;
        ifp->if_watchdog = aue_watchdog;
        strlcpy(ifp->if_xname, sc->aue_dev.dv_xname, IFNAMSIZ);

        ifp->if_capabilities = IFCAP_VLAN_MTU;

        /* Initialize MII/media info. */
        mii = &sc->aue_mii;
        mii->mii_ifp = ifp;
        mii->mii_readreg = aue_miibus_readreg;
        mii->mii_writereg = aue_miibus_writereg;
        mii->mii_statchg = aue_miibus_statchg;
        mii->mii_flags = MIIF_AUTOTSLEEP;
        ifmedia_init(&mii->mii_media, 0, aue_ifmedia_upd, aue_ifmedia_sts);
        mii_attach(self, mii, 0xffffffff, MII_PHY_ANY, MII_OFFSET_ANY, 0);
        if (LIST_FIRST(&mii->mii_phys) == NULL) {
                ifmedia_add(&mii->mii_media, IFM_ETHER | IFM_NONE, 0, NULL);
                ifmedia_set(&mii->mii_media, IFM_ETHER | IFM_NONE);
        } else
                ifmedia_set(&mii->mii_media, IFM_ETHER | IFM_AUTO);

        /* Attach the interface. */
        if_attach(ifp);
        ether_ifattach(ifp);

        timeout_set(&sc->aue_stat_ch, aue_tick, sc);

        splx(s);
}

int
aue_detach(struct device *self, int flags)
{
        struct aue_softc        *sc = (struct aue_softc *)self;
        struct ifnet            *ifp = GET_IFP(sc);
        int                     s;

        DPRINTFN(2,("%s: %s: enter\n", sc->aue_dev.dv_xname, __func__));

        if (timeout_initialized(&sc->aue_stat_ch))
                timeout_del(&sc->aue_stat_ch);

        /*
         * Remove any pending tasks.  They cannot be executing because they run
         * in the same thread as detach.
         */
        usb_rem_task(sc->aue_udev, &sc->aue_tick_task);
        usb_rem_task(sc->aue_udev, &sc->aue_stop_task);

        s = splusb();

        if (ifp->if_flags & IFF_RUNNING)
                aue_stop(sc);

        mii_detach(&sc->aue_mii, MII_PHY_ANY, MII_OFFSET_ANY);
        ifmedia_delete_instance(&sc->aue_mii.mii_media, IFM_INST_ANY);
        if (ifp->if_softc != NULL) {
                ether_ifdetach(ifp);
                if_detach(ifp);
        }

#ifdef DIAGNOSTIC
        if (sc->aue_ep[AUE_ENDPT_TX] != NULL ||
            sc->aue_ep[AUE_ENDPT_RX] != NULL ||
            sc->aue_ep[AUE_ENDPT_INTR] != NULL)
                printf("%s: detach has active endpoints\n",
                       sc->aue_dev.dv_xname);
#endif

        if (--sc->aue_refcnt >= 0) {
                /* Wait for processes to go away. */
                usb_detach_wait(&sc->aue_dev);
        }
        splx(s);

        return (0);
}

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

        DPRINTFN(10,("%s: %s: enter\n", sc->aue_dev.dv_xname,__func__));

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

                MCLGET(m_new, M_DONTWAIT);
                if (!(m_new->m_flags & M_EXT)) {
                        printf("%s: no memory for rx list "
                            "-- packet dropped!\n", sc->aue_dev.dv_xname);
                        m_freem(m_new);
                        return (ENOBUFS);
                }
                m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
        } else {
                m_new = m;
                m_new->m_len = m_new->m_pkthdr.len = MCLBYTES;
                m_new->m_data = m_new->m_ext.ext_buf;
        }

        m_adj(m_new, ETHER_ALIGN);
        c->aue_mbuf = m_new;

        return (0);
}

int
aue_rx_list_init(struct aue_softc *sc)
{
        struct aue_cdata        *cd;
        struct aue_chain        *c;
        int                     i;

        DPRINTFN(5,("%s: %s: enter\n", sc->aue_dev.dv_xname, __func__));

        cd = &sc->aue_cdata;
        for (i = 0; i < AUE_RX_LIST_CNT; i++) {
                c = &cd->aue_rx_chain[i];
                c->aue_sc = sc;
                c->aue_idx = i;
                if (aue_newbuf(sc, c, NULL) == ENOBUFS)
                        return (ENOBUFS);
                if (c->aue_xfer == NULL) {
                        c->aue_xfer = usbd_alloc_xfer(sc->aue_udev);
                        if (c->aue_xfer == NULL)
                                return (ENOBUFS);
                        c->aue_buf = usbd_alloc_buffer(c->aue_xfer, AUE_BUFSZ);
                        if (c->aue_buf == NULL)
                                return (ENOBUFS); /* XXX free xfer */
                }
        }

        return (0);
}

int
aue_tx_list_init(struct aue_softc *sc)
{
        struct aue_cdata        *cd;
        struct aue_chain        *c;
        int                     i;

        DPRINTFN(5,("%s: %s: enter\n", sc->aue_dev.dv_xname, __func__));

        cd = &sc->aue_cdata;
        for (i = 0; i < AUE_TX_LIST_CNT; i++) {
                c = &cd->aue_tx_chain[i];
                c->aue_sc = sc;
                c->aue_idx = i;
                c->aue_mbuf = NULL;
                if (c->aue_xfer == NULL) {
                        c->aue_xfer = usbd_alloc_xfer(sc->aue_udev);
                        if (c->aue_xfer == NULL)
                                return (ENOBUFS);
                        c->aue_buf = usbd_alloc_buffer(c->aue_xfer, AUE_BUFSZ);
                        if (c->aue_buf == NULL)
                                return (ENOBUFS);
                }
        }

        return (0);
}

void
aue_intr(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
        struct aue_softc        *sc = priv;
        struct ifnet            *ifp = GET_IFP(sc);
        struct aue_intrpkt      *p = &sc->aue_cdata.aue_ibuf;

        DPRINTFN(15,("%s: %s: enter\n", sc->aue_dev.dv_xname,__func__));

        if (usbd_is_dying(sc->aue_udev))
                return;

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

        if (status != USBD_NORMAL_COMPLETION) {
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) {
                        return;
                }
                sc->aue_intr_errs++;
                if (usbd_ratecheck(&sc->aue_rx_notice)) {
                        printf("%s: %u usb errors on intr: %s\n",
                            sc->aue_dev.dv_xname, sc->aue_intr_errs,
                            usbd_errstr(status));
                        sc->aue_intr_errs = 0;
                }
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(sc->aue_ep[AUE_ENDPT_RX]);
                return;
        }

        if (p->aue_txstat0)
                ifp->if_oerrors++;

        if (p->aue_txstat0 & (AUE_TXSTAT0_LATECOLL | AUE_TXSTAT0_EXCESSCOLL))
                ifp->if_collisions++;
}

/*
 * A frame has been uploaded: pass the resulting mbuf chain up to
 * the higher level protocols.
 */
void
aue_rxeof(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
        struct aue_chain        *c = priv;
        struct aue_softc        *sc = c->aue_sc;
        struct ifnet            *ifp = GET_IFP(sc);
        struct mbuf             *m;
        struct mbuf_list        ml = MBUF_LIST_INITIALIZER();
        u_int32_t               total_len;
        struct aue_rxpkt        r;
        int                     s;

        DPRINTFN(10,("%s: %s: enter\n", sc->aue_dev.dv_xname,__func__));

        if (usbd_is_dying(sc->aue_udev))
                return;

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

        if (status != USBD_NORMAL_COMPLETION) {
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED)
                        return;
                sc->aue_rx_errs++;
                if (usbd_ratecheck(&sc->aue_rx_notice)) {
                        printf("%s: %u usb errors on rx: %s\n",
                            sc->aue_dev.dv_xname, sc->aue_rx_errs,
                            usbd_errstr(status));
                        sc->aue_rx_errs = 0;
                }
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(sc->aue_ep[AUE_ENDPT_RX]);
                goto done;
        }

        usbd_get_xfer_status(xfer, NULL, NULL, &total_len, NULL);

        memcpy(mtod(c->aue_mbuf, char *), c->aue_buf, total_len);

        if (total_len <= 4 + ETHER_CRC_LEN) {
                ifp->if_ierrors++;
                goto done;
        }

        memcpy(&r, c->aue_buf + total_len - 4, sizeof(r));

        /* Turn off all the non-error bits in the rx status word. */
        r.aue_rxstat &= AUE_RXSTAT_MASK;
        if (r.aue_rxstat) {
                ifp->if_ierrors++;
                goto done;
        }

        /* No errors; receive the packet. */
        m = c->aue_mbuf;
        total_len -= ETHER_CRC_LEN + 4;
        m->m_pkthdr.len = m->m_len = total_len;
        ml_enqueue(&ml, m);

        if (aue_newbuf(sc, c, NULL) == ENOBUFS) {
                ifp->if_ierrors++;
                goto done;
        }

        s = splnet();
        if_input(ifp, &ml);
        splx(s);

 done:

        /* Setup new transfer. */
        usbd_setup_xfer(xfer, sc->aue_ep[AUE_ENDPT_RX],
            c, c->aue_buf, AUE_BUFSZ,
            USBD_SHORT_XFER_OK | USBD_NO_COPY,
            USBD_NO_TIMEOUT, aue_rxeof);
        usbd_transfer(xfer);

        DPRINTFN(10,("%s: %s: start rx\n", sc->aue_dev.dv_xname,
                    __func__));
}

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

void
aue_txeof(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
        struct aue_chain        *c = priv;
        struct aue_softc        *sc = c->aue_sc;
        struct ifnet            *ifp = GET_IFP(sc);
        int                     s;

        if (usbd_is_dying(sc->aue_udev))
                return;

        s = splnet();

        DPRINTFN(10,("%s: %s: enter status=%d\n", sc->aue_dev.dv_xname,
                    __func__, status));

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

        if (status != USBD_NORMAL_COMPLETION) {
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED) {
                        splx(s);
                        return;
                }
                ifp->if_oerrors++;
                printf("%s: usb error on tx: %s\n", sc->aue_dev.dv_xname,
                    usbd_errstr(status));
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(sc->aue_ep[AUE_ENDPT_TX]);
                splx(s);
                return;
        }

        m_freem(c->aue_mbuf);
        c->aue_mbuf = NULL;

        if (ifq_empty(&ifp->if_snd) == 0)
                aue_start(ifp);

        splx(s);
}

void
aue_tick(void *xsc)
{
        struct aue_softc        *sc = xsc;

        DPRINTFN(15,("%s: %s: enter\n", sc->aue_dev.dv_xname,__func__));

        if (sc == NULL)
                return;

        if (usbd_is_dying(sc->aue_udev))
                return;

        /* Perform periodic stuff in process context. */
        usb_add_task(sc->aue_udev, &sc->aue_tick_task);
}

void
aue_tick_task(void *xsc)
{
        struct aue_softc        *sc = xsc;
        struct ifnet            *ifp;
        struct mii_data         *mii;
        int                     s;

        DPRINTFN(15,("%s: %s: enter\n", sc->aue_dev.dv_xname,__func__));

        if (usbd_is_dying(sc->aue_udev))
                return;

        ifp = GET_IFP(sc);
        mii = GET_MII(sc);
        if (mii == NULL)
                return;

        s = splnet();

        mii_tick(mii);
        if (!sc->aue_link && mii->mii_media_status & IFM_ACTIVE &&
            IFM_SUBTYPE(mii->mii_media_active) != IFM_NONE) {
                DPRINTFN(2,("%s: %s: got link\n",
                            sc->aue_dev.dv_xname,__func__));
                sc->aue_link++;
                if (ifq_empty(&ifp->if_snd) == 0)
                        aue_start(ifp);
        }

        timeout_add_sec(&sc->aue_stat_ch, 1);

        splx(s);
}

int
aue_send(struct aue_softc *sc, struct mbuf *m, int idx)
{
        int                     total_len;
        struct aue_chain        *c;
        usbd_status             err;

        DPRINTFN(10,("%s: %s: enter\n", sc->aue_dev.dv_xname,__func__));

        c = &sc->aue_cdata.aue_tx_chain[idx];

        /*
         * Copy the mbuf data into a contiguous buffer, leaving two
         * bytes at the beginning to hold the frame length.
         */
        m_copydata(m, 0, m->m_pkthdr.len, c->aue_buf + 2);
        c->aue_mbuf = m;

        /*
         * The ADMtek documentation says that the packet length is
         * supposed to be specified in the first two bytes of the
         * transfer, however it actually seems to ignore this info
         * and base the frame size on the bulk transfer length.
         */
        c->aue_buf[0] = (u_int8_t)m->m_pkthdr.len;
        c->aue_buf[1] = (u_int8_t)(m->m_pkthdr.len >> 8);
        total_len = m->m_pkthdr.len + 2;

        usbd_setup_xfer(c->aue_xfer, sc->aue_ep[AUE_ENDPT_TX],
            c, c->aue_buf, total_len, USBD_FORCE_SHORT_XFER | USBD_NO_COPY,
            AUE_TX_TIMEOUT, aue_txeof);

        /* Transmit */
        err = usbd_transfer(c->aue_xfer);
        if (err != USBD_IN_PROGRESS) {
                printf("%s: aue_send error=%s\n", sc->aue_dev.dv_xname,
                       usbd_errstr(err));
                /* Stop the interface from process context. */
                usb_add_task(sc->aue_udev, &sc->aue_stop_task);
                return (EIO);
        }
        DPRINTFN(5,("%s: %s: send %d bytes\n", sc->aue_dev.dv_xname,
                    __func__, total_len));

        sc->aue_cdata.aue_tx_cnt++;

        return (0);
}

void
aue_start(struct ifnet *ifp)
{
        struct aue_softc        *sc = ifp->if_softc;
        struct mbuf             *m_head = NULL;

        DPRINTFN(5,("%s: %s: enter, link=%d\n", sc->aue_dev.dv_xname,
                    __func__, sc->aue_link));

        if (usbd_is_dying(sc->aue_udev))
                return;

        if (!sc->aue_link)
                return;

        if (ifq_is_oactive(&ifp->if_snd))
                return;

        m_head = ifq_deq_begin(&ifp->if_snd);
        if (m_head == NULL)
                return;

        if (aue_send(sc, m_head, 0)) {
                ifq_deq_rollback(&ifp->if_snd, m_head);
                ifq_set_oactive(&ifp->if_snd);
                return;
        }

        ifq_deq_commit(&ifp->if_snd, m_head);

#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

        ifq_set_oactive(&ifp->if_snd);

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

void
aue_init(void *xsc)
{
        struct aue_softc        *sc = xsc;
        struct ifnet            *ifp = GET_IFP(sc);
        struct mii_data         *mii = GET_MII(sc);
        int                     i, s;
        u_char                  *eaddr;

        DPRINTFN(5,("%s: %s: enter\n", sc->aue_dev.dv_xname, __func__));

        if (usbd_is_dying(sc->aue_udev))
                return;

        s = splnet();

        /*
         * Cancel pending I/O and free all RX/TX buffers.
         */
        aue_reset(sc);

        eaddr = sc->arpcom.ac_enaddr;
        for (i = 0; i < ETHER_ADDR_LEN; i++)
                aue_csr_write_1(sc, AUE_PAR0 + i, eaddr[i]);

        /* Init TX ring. */
        if (aue_tx_list_init(sc) == ENOBUFS) {
                printf("%s: tx list init failed\n", sc->aue_dev.dv_xname);
                splx(s);
                return;
        }

        /* Init RX ring. */
        if (aue_rx_list_init(sc) == ENOBUFS) {
                printf("%s: rx list init failed\n", sc->aue_dev.dv_xname);
                splx(s);
                return;
        }

        /* Program promiscuous mode and multicast filters. */
        aue_iff(sc);

        /* Enable RX and TX */
        AUE_SETBIT(sc, AUE_CTL0,
            AUE_CTL0_RXSTAT_APPEND | AUE_CTL0_RX_ENB | AUE_CTL0_TX_ENB);
        AUE_SETBIT(sc, AUE_CTL2, AUE_CTL2_EP3_CLR);

        mii_mediachg(mii);

        if (sc->aue_ep[AUE_ENDPT_RX] == NULL) {
                if (aue_openpipes(sc)) {
                        splx(s);
                        return;
                }
        }

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

        splx(s);

        timeout_add_sec(&sc->aue_stat_ch, 1);
}

int
aue_openpipes(struct aue_softc *sc)
{
        struct aue_chain        *c;
        usbd_status             err;
        int i;

        /* Open RX and TX pipes. */
        err = usbd_open_pipe(sc->aue_iface, sc->aue_ed[AUE_ENDPT_RX],
            USBD_EXCLUSIVE_USE, &sc->aue_ep[AUE_ENDPT_RX]);
        if (err) {
                printf("%s: open rx pipe failed: %s\n",
                    sc->aue_dev.dv_xname, usbd_errstr(err));
                return (EIO);
        }
        err = usbd_open_pipe(sc->aue_iface, sc->aue_ed[AUE_ENDPT_TX],
            USBD_EXCLUSIVE_USE, &sc->aue_ep[AUE_ENDPT_TX]);
        if (err) {
                printf("%s: open tx pipe failed: %s\n",
                    sc->aue_dev.dv_xname, usbd_errstr(err));
                return (EIO);
        }
        err = usbd_open_pipe_intr(sc->aue_iface, sc->aue_ed[AUE_ENDPT_INTR],
            0, &sc->aue_ep[AUE_ENDPT_INTR], sc,
            &sc->aue_cdata.aue_ibuf, AUE_INTR_PKTLEN, aue_intr,
            AUE_INTR_INTERVAL);
        if (err) {
                printf("%s: open intr pipe failed: %s\n",
                    sc->aue_dev.dv_xname, usbd_errstr(err));
                return (EIO);
        }

        /* Start up the receive pipe. */
        for (i = 0; i < AUE_RX_LIST_CNT; i++) {
                c = &sc->aue_cdata.aue_rx_chain[i];
                usbd_setup_xfer(c->aue_xfer, sc->aue_ep[AUE_ENDPT_RX],
                    c, c->aue_buf, AUE_BUFSZ,
                    USBD_SHORT_XFER_OK | USBD_NO_COPY, USBD_NO_TIMEOUT,
                    aue_rxeof);
                (void)usbd_transfer(c->aue_xfer); /* XXX */
                DPRINTFN(5,("%s: %s: start read\n", sc->aue_dev.dv_xname,
                            __func__));

        }
        return (0);
}

/*
 * Set media options.
 */
int
aue_ifmedia_upd(struct ifnet *ifp)
{
        struct aue_softc        *sc = ifp->if_softc;
        struct mii_data         *mii = GET_MII(sc);

        DPRINTFN(5,("%s: %s: enter\n", sc->aue_dev.dv_xname, __func__));

        if (usbd_is_dying(sc->aue_udev))
                return (0);

        sc->aue_link = 0;
        if (mii->mii_instance) {
                struct mii_softc        *miisc;
                LIST_FOREACH(miisc, &mii->mii_phys, mii_list)
                        mii_phy_reset(miisc);
        }
        mii_mediachg(mii);

        return (0);
}

/*
 * Report current media status.
 */
void
aue_ifmedia_sts(struct ifnet *ifp, struct ifmediareq *ifmr)
{
        struct aue_softc        *sc = ifp->if_softc;
        struct mii_data         *mii = GET_MII(sc);

        DPRINTFN(5,("%s: %s: enter\n", sc->aue_dev.dv_xname, __func__));

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

int
aue_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
{
        struct aue_softc        *sc = ifp->if_softc;
        struct ifreq            *ifr = (struct ifreq *)data;
        int                     s, error = 0;

        if (usbd_is_dying(sc->aue_udev))
                return ENXIO;

        s = splnet();

        switch(command) {
        case SIOCSIFADDR:
                ifp->if_flags |= IFF_UP;
                if (!(ifp->if_flags & IFF_RUNNING))
                        aue_init(sc);
                break;

        case SIOCSIFFLAGS:
                if (ifp->if_flags & IFF_UP) {
                        if (ifp->if_flags & IFF_RUNNING)
                                error = ENETRESET;
                        else
                                aue_init(sc);
                } else {
                        if (ifp->if_flags & IFF_RUNNING)
                                aue_stop(sc);
                }
                break;

        case SIOCGIFMEDIA:
        case SIOCSIFMEDIA:
                error = ifmedia_ioctl(ifp, ifr, &sc->aue_mii.mii_media, command);
                break;

        default:
                error = ether_ioctl(ifp, &sc->arpcom, command, data);
        }

        if (error == ENETRESET) {
                if (ifp->if_flags & IFF_RUNNING)
                        aue_iff(sc);
                error = 0;
        }

        splx(s);
        return (error);
}

void
aue_watchdog(struct ifnet *ifp)
{
        struct aue_softc        *sc = ifp->if_softc;
        struct aue_chain        *c;
        usbd_status             stat;
        int                     s;

        DPRINTFN(5,("%s: %s: enter\n", sc->aue_dev.dv_xname, __func__));

        ifp->if_oerrors++;
        printf("%s: watchdog timeout\n", sc->aue_dev.dv_xname);

        s = splusb();
        c = &sc->aue_cdata.aue_tx_chain[0];
        usbd_get_xfer_status(c->aue_xfer, NULL, NULL, NULL, &stat);
        aue_txeof(c->aue_xfer, c, stat);

        if (ifq_empty(&ifp->if_snd) == 0)
                aue_start(ifp);
        splx(s);
}

/*
 * Stop the adapter and free any mbufs allocated to the
 * RX and TX lists.
 */
void
aue_stop(struct aue_softc *sc)
{
        usbd_status             err;
        struct ifnet            *ifp;
        int                     i;

        DPRINTFN(5,("%s: %s: enter\n", sc->aue_dev.dv_xname, __func__));

        ifp = GET_IFP(sc);
        ifp->if_timer = 0;
        ifp->if_flags &= ~IFF_RUNNING;
        ifq_clr_oactive(&ifp->if_snd);

        aue_csr_write_1(sc, AUE_CTL0, 0);
        aue_csr_write_1(sc, AUE_CTL1, 0);
        aue_reset(sc);
        timeout_del(&sc->aue_stat_ch);

        /* Stop transfers. */
        if (sc->aue_ep[AUE_ENDPT_RX] != NULL) {
                err = usbd_close_pipe(sc->aue_ep[AUE_ENDPT_RX]);
                if (err) {
                        printf("%s: close rx pipe failed: %s\n",
                            sc->aue_dev.dv_xname, usbd_errstr(err));
                }
                sc->aue_ep[AUE_ENDPT_RX] = NULL;
        }

        if (sc->aue_ep[AUE_ENDPT_TX] != NULL) {
                err = usbd_close_pipe(sc->aue_ep[AUE_ENDPT_TX]);
                if (err) {
                        printf("%s: close tx pipe failed: %s\n",
                            sc->aue_dev.dv_xname, usbd_errstr(err));
                }
                sc->aue_ep[AUE_ENDPT_TX] = NULL;
        }

        if (sc->aue_ep[AUE_ENDPT_INTR] != NULL) {
                err = usbd_close_pipe(sc->aue_ep[AUE_ENDPT_INTR]);
                if (err) {
                        printf("%s: close intr pipe failed: %s\n",
                            sc->aue_dev.dv_xname, usbd_errstr(err));
                }
                sc->aue_ep[AUE_ENDPT_INTR] = NULL;
        }

        /* Free RX resources. */
        for (i = 0; i < AUE_RX_LIST_CNT; i++) {
                if (sc->aue_cdata.aue_rx_chain[i].aue_mbuf != NULL) {
                        m_freem(sc->aue_cdata.aue_rx_chain[i].aue_mbuf);
                        sc->aue_cdata.aue_rx_chain[i].aue_mbuf = NULL;
                }
                if (sc->aue_cdata.aue_rx_chain[i].aue_xfer != NULL) {
                        usbd_free_xfer(sc->aue_cdata.aue_rx_chain[i].aue_xfer);
                        sc->aue_cdata.aue_rx_chain[i].aue_xfer = NULL;
                }
        }

        /* Free TX resources. */
        for (i = 0; i < AUE_TX_LIST_CNT; i++) {
                if (sc->aue_cdata.aue_tx_chain[i].aue_mbuf != NULL) {
                        m_freem(sc->aue_cdata.aue_tx_chain[i].aue_mbuf);
                        sc->aue_cdata.aue_tx_chain[i].aue_mbuf = NULL;
                }
                if (sc->aue_cdata.aue_tx_chain[i].aue_xfer != NULL) {
                        usbd_free_xfer(sc->aue_cdata.aue_tx_chain[i].aue_xfer);
                        sc->aue_cdata.aue_tx_chain[i].aue_xfer = NULL;
                }
        }

        sc->aue_link = 0;
}