/*      $OpenBSD: if_udav.c,v 1.86 2024/05/23 03:21:09 jsg Exp $ */
/*      $NetBSD: if_udav.c,v 1.3 2004/04/23 17:25:25 itojun Exp $       */
/*      $nabe: if_udav.c,v 1.3 2003/08/21 16:57:19 nabe Exp $   */
/*
 * Copyright (c) 2003
 *     Shingo WATANABE <nabe@nabechan.org>.  All rights reserved.
 * Copyright (c) 2014
 *     Takayoshi SASANO <uaa@uaa.org.uk> (RD9700 support)
 *
 * 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. 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 AUTHOR 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 THE AUTHOR OR CONTRIBUTORS 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.
 *
 */

/*
 * DM9601(DAVICOM USB to Ethernet MAC Controller with Integrated 10/100 PHY)
 * The spec can be found at the following url.
 *  http://www.meworks.net/userfile/24247/DM9601-DS-P03-102908.pdf
 */

/*
 * TODO:
 *      Interrupt Endpoint support
 *      External PHYs
 */

#include "bpfilter.h"

#include <sys/param.h>
#include <sys/systm.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_udavreg.h>

int udav_match(struct device *, void *, void *);
void udav_attach(struct device *, struct device *, void *);
int udav_detach(struct device *, int);

struct cfdriver udav_cd = {
        NULL, "udav", DV_IFNET
};

const struct cfattach udav_ca = {
        sizeof(struct udav_softc), udav_match, udav_attach, udav_detach
};

int udav_openpipes(struct udav_softc *);
int udav_rx_list_init(struct udav_softc *);
int udav_tx_list_init(struct udav_softc *);
int udav_newbuf(struct udav_softc *, struct udav_chain *, struct mbuf *);
void udav_start(struct ifnet *);
int udav_send(struct udav_softc *, struct mbuf *, int);
void udav_txeof(struct usbd_xfer *, void *, usbd_status);
void udav_rxeof(struct usbd_xfer *, void *, usbd_status);
void udav_tick(void *);
void udav_tick_task(void *);
int udav_ioctl(struct ifnet *, u_long, caddr_t);
void udav_stop_task(struct udav_softc *);
void udav_stop(struct ifnet *, int);
void udav_watchdog(struct ifnet *);
int udav_ifmedia_change(struct ifnet *);
void udav_ifmedia_status(struct ifnet *, struct ifmediareq *);
void udav_lock_mii(struct udav_softc *);
void udav_unlock_mii(struct udav_softc *);
int udav_miibus_readreg(struct device *, int, int);
void udav_miibus_writereg(struct device *, int, int, int);
void udav_miibus_statchg(struct device *);
int udav_init(struct ifnet *);
void udav_iff(struct udav_softc *);
void udav_reset(struct udav_softc *);

int udav_csr_read(struct udav_softc *, int, void *, int);
int udav_csr_write(struct udav_softc *, int, void *, int);
int udav_csr_read1(struct udav_softc *, int);
int udav_csr_write1(struct udav_softc *, int, unsigned char);

#if 0
int udav_mem_read(struct udav_softc *, int, void *, int);
int udav_mem_write(struct udav_softc *, int, void *, int);
int udav_mem_write1(struct udav_softc *, int, unsigned char);
#endif

/* Macros */
#ifdef UDAV_DEBUG
#define DPRINTF(x)      do { if (udavdebug) printf x; } while(0)
#define DPRINTFN(n,x)   do { if (udavdebug >= (n)) printf x; } while(0)
int udavdebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

#define UDAV_SETBIT(sc, reg, x) \
        udav_csr_write1(sc, reg, udav_csr_read1(sc, reg) | (x))

#define UDAV_CLRBIT(sc, reg, x) \
        udav_csr_write1(sc, reg, udav_csr_read1(sc, reg) & ~(x))

static const struct udav_type {
        struct usb_devno udav_dev;
        u_int16_t udav_flags;
#define UDAV_EXT_PHY    0x0001
#define UDAV_RD9700     0x0002
} udav_devs [] = {
        {{ USB_VENDOR_COREGA, USB_PRODUCT_COREGA_FETHER_USB_TXC }, 0 },
        {{ USB_VENDOR_DAVICOM, USB_PRODUCT_DAVICOM_DM9601 }, 0 },
        {{ USB_VENDOR_DAVICOM, USB_PRODUCT_DAVICOM_WK668 }, 0 },
        {{ USB_VENDOR_SHANTOU, USB_PRODUCT_SHANTOU_DM9601 }, 0 },
        {{ USB_VENDOR_SHANTOU, USB_PRODUCT_SHANTOU_ST268 }, 0 },
        {{ USB_VENDOR_SHANTOU, USB_PRODUCT_SHANTOU_ZT6688 }, 0 },
        {{ USB_VENDOR_SHANTOU, USB_PRODUCT_SHANTOU_ADM8515 }, 0 },
        {{ USB_VENDOR_UNKNOWN4, USB_PRODUCT_UNKNOWN4_DM9601 }, 0 },
        {{ USB_VENDOR_UNKNOWN6, USB_PRODUCT_UNKNOWN6_DM9601 }, 0 },
        {{ USB_VENDOR_UNKNOWN4, USB_PRODUCT_UNKNOWN4_RD9700 }, UDAV_RD9700 },
};
#define udav_lookup(v, p) ((struct udav_type *)usb_lookup(udav_devs, v, p))


/* Probe */
int
udav_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 (udav_lookup(uaa->vendor, uaa->product) != NULL ?
                UMATCH_VENDOR_PRODUCT_CONF_IFACE : UMATCH_NONE);
}

/* Attach */
void
udav_attach(struct device *parent, struct device *self, void *aux)
{
        struct udav_softc *sc = (struct udav_softc *)self;
        struct usb_attach_arg *uaa = aux;
        struct usbd_device *dev = uaa->device;
        struct usbd_interface *iface = uaa->iface;
        usbd_status err;
        usb_interface_descriptor_t *id;
        usb_endpoint_descriptor_t *ed;
        char *devname = sc->sc_dev.dv_xname;
        struct ifnet *ifp;
        struct mii_data *mii;
        u_char eaddr[ETHER_ADDR_LEN];
        int i, s;

        printf("%s: ", devname);

        sc->sc_udev = dev;

        usb_init_task(&sc->sc_tick_task, udav_tick_task, sc,
            USB_TASK_TYPE_GENERIC);
        rw_init(&sc->sc_mii_lock, "udavmii");
        usb_init_task(&sc->sc_stop_task, (void (*)(void *)) udav_stop_task, sc,
            USB_TASK_TYPE_GENERIC);

        sc->sc_ctl_iface = iface;
        sc->sc_flags = udav_lookup(uaa->vendor, uaa->product)->udav_flags;

        /* get interface descriptor */
        id = usbd_get_interface_descriptor(sc->sc_ctl_iface);

        /* find endpoints */
        sc->sc_bulkin_no = sc->sc_bulkout_no = sc->sc_intrin_no = -1;
        for (i = 0; i < id->bNumEndpoints; i++) {
                ed = usbd_interface2endpoint_descriptor(sc->sc_ctl_iface, i);
                if (ed == NULL) {
                        printf("couldn't get endpoint %d\n", i);
                        goto bad;
                }
                if (UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK &&
                    UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN)
                        sc->sc_bulkin_no = ed->bEndpointAddress; /* RX */
                else if (UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK &&
                         UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT)
                        sc->sc_bulkout_no = ed->bEndpointAddress; /* TX */
                else if (UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT &&
                         UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN)
                        sc->sc_intrin_no = ed->bEndpointAddress; /* Status */
        }

        if (sc->sc_bulkin_no == -1 || sc->sc_bulkout_no == -1 ||
            sc->sc_intrin_no == -1) {
                printf("missing endpoint\n");
                goto bad;
        }

        s = splnet();

        /* reset the adapter */
        udav_reset(sc);

        /* Get Ethernet Address */
        err = udav_csr_read(sc, UDAV_PAR, (void *)eaddr, ETHER_ADDR_LEN);
        if (err) {
                printf("read MAC address failed\n");
                splx(s);
                goto bad;
        }

        /* Print Ethernet Address */
        printf("address %s\n", ether_sprintf(eaddr));

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

        /* initialize interface information */
        ifp = GET_IFP(sc);
        ifp->if_softc = sc;
        strlcpy(ifp->if_xname, devname, IFNAMSIZ);
        ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
        ifp->if_start = udav_start;
        ifp->if_ioctl = udav_ioctl;
        ifp->if_watchdog = udav_watchdog;

        /*
         * Do ifmedia setup.
         */
        mii = &sc->sc_mii;
        mii->mii_ifp = ifp;
        mii->mii_readreg = udav_miibus_readreg;
        mii->mii_writereg = udav_miibus_writereg;
        mii->mii_statchg = udav_miibus_statchg;
        mii->mii_flags = MIIF_AUTOTSLEEP;
        ifmedia_init(&mii->mii_media, 0,
                     udav_ifmedia_change, udav_ifmedia_status);
        if (sc->sc_flags & UDAV_RD9700) {
                /* no MII-PHY */
                ifmedia_add(&mii->mii_media, IFM_ETHER | IFM_NONE, 0, NULL);
                ifmedia_set(&mii->mii_media, IFM_ETHER | IFM_NONE);
        } else {
                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->sc_stat_ch, udav_tick, sc);

        splx(s);

        return;

 bad:
        usbd_deactivate(sc->sc_udev);
}

/* detach */
int
udav_detach(struct device *self, int flags)
{
        struct udav_softc *sc = (struct udav_softc *)self;
        struct ifnet *ifp = GET_IFP(sc);
        int s;

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));


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

        /* Remove any pending tasks */
        usb_rem_task(sc->sc_udev, &sc->sc_tick_task);
        usb_rem_task(sc->sc_udev, &sc->sc_stop_task);

        s = splusb();

        if (--sc->sc_refcnt >= 0) {
                /* Wait for processes to go away */
                usb_detach_wait(&sc->sc_dev);
        }
        if (ifp->if_flags & IFF_RUNNING)
                udav_stop(GET_IFP(sc), 1);

        if (!(sc->sc_flags & UDAV_RD9700))
                mii_detach(&sc->sc_mii, MII_PHY_ANY, MII_OFFSET_ANY);
        ifmedia_delete_instance(&sc->sc_mii.mii_media, IFM_INST_ANY);
        if (ifp->if_softc != NULL) {
                ether_ifdetach(ifp);
                if_detach(ifp);
        }

#ifdef DIAGNOSTIC
        if (sc->sc_pipe_tx != NULL)
                printf("%s: detach has active tx endpoint.\n",
                       sc->sc_dev.dv_xname);
        if (sc->sc_pipe_rx != NULL)
                printf("%s: detach has active rx endpoint.\n",
                       sc->sc_dev.dv_xname);
        if (sc->sc_pipe_intr != NULL)
                printf("%s: detach has active intr endpoint.\n",
                       sc->sc_dev.dv_xname);
#endif
        splx(s);

        return (0);
}

#if 0
/* read memory */
int
udav_mem_read(struct udav_softc *sc, int offset, void *buf, int len)
{
        usb_device_request_t req;
        usbd_status err;

        if (sc == NULL)
                return (0);

        DPRINTFN(0x200,
                ("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        offset &= 0xffff;
        len &= 0xff;

        req.bmRequestType = UT_READ_VENDOR_DEVICE;
        req.bRequest = UDAV_REQ_MEM_READ;
        USETW(req.wValue, 0x0000);
        USETW(req.wIndex, offset);
        USETW(req.wLength, len);

        sc->sc_refcnt++;
        err = usbd_do_request(sc->sc_udev, &req, buf);
        if (--sc->sc_refcnt < 0)
                usb_detach_wakeup(&sc->sc_dev);
        if (err) {
                DPRINTF(("%s: %s: read failed. off=%04x, err=%d\n",
                         sc->sc_dev.dv_xname, __func__, offset, err));
        }

        return (err);
}

/* write memory */
int
udav_mem_write(struct udav_softc *sc, int offset, void *buf, int len)
{
        usb_device_request_t req;
        usbd_status err;

        if (sc == NULL)
                return (0);

        DPRINTFN(0x200,
                ("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        offset &= 0xffff;
        len &= 0xff;

        req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
        req.bRequest = UDAV_REQ_MEM_WRITE;
        USETW(req.wValue, 0x0000);
        USETW(req.wIndex, offset);
        USETW(req.wLength, len);

        sc->sc_refcnt++;
        err = usbd_do_request(sc->sc_udev, &req, buf);
        if (--sc->sc_refcnt < 0)
                usb_detach_wakeup(&sc->sc_dev);
        if (err) {
                DPRINTF(("%s: %s: write failed. off=%04x, err=%d\n",
                         sc->sc_dev.dv_xname, __func__, offset, err));
        }

        return (err);
}

/* write memory */
int
udav_mem_write1(struct udav_softc *sc, int offset, unsigned char ch)
{
        usb_device_request_t req;
        usbd_status err;

        if (sc == NULL)
                return (0);

        DPRINTFN(0x200,
                ("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        offset &= 0xffff;

        req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
        req.bRequest = UDAV_REQ_MEM_WRITE1;
        USETW(req.wValue, ch);
        USETW(req.wIndex, offset);
        USETW(req.wLength, 0x0000);

        sc->sc_refcnt++;
        err = usbd_do_request(sc->sc_udev, &req, NULL);
        if (--sc->sc_refcnt < 0)
                usb_detach_wakeup(&sc->sc_dev);
        if (err) {
                DPRINTF(("%s: %s: write failed. off=%04x, err=%d\n",
                         sc->sc_dev.dv_xname, __func__, offset, err));
        }

        return (err);
}
#endif

/* read register(s) */
int
udav_csr_read(struct udav_softc *sc, int offset, void *buf, int len)
{
        usb_device_request_t req;
        usbd_status err;

        if (sc == NULL)
                return (0);

        DPRINTFN(0x200,
                ("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        offset &= 0xff;
        len &= 0xff;

        req.bmRequestType = UT_READ_VENDOR_DEVICE;
        req.bRequest = UDAV_REQ_REG_READ;
        USETW(req.wValue, 0x0000);
        USETW(req.wIndex, offset);
        USETW(req.wLength, len);

        sc->sc_refcnt++;
        err = usbd_do_request(sc->sc_udev, &req, buf);
        if (--sc->sc_refcnt < 0)
                usb_detach_wakeup(&sc->sc_dev);
        if (err) {
                DPRINTF(("%s: %s: read failed. off=%04x, err=%d\n",
                         sc->sc_dev.dv_xname, __func__, offset, err));
        }

        return (err);
}

/* write register(s) */
int
udav_csr_write(struct udav_softc *sc, int offset, void *buf, int len)
{
        usb_device_request_t req;
        usbd_status err;

        if (sc == NULL)
                return (0);

        DPRINTFN(0x200,
                ("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        offset &= 0xff;
        len &= 0xff;

        req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
        req.bRequest = UDAV_REQ_REG_WRITE;
        USETW(req.wValue, 0x0000);
        USETW(req.wIndex, offset);
        USETW(req.wLength, len);

        sc->sc_refcnt++;
        err = usbd_do_request(sc->sc_udev, &req, buf);
        if (--sc->sc_refcnt < 0)
                usb_detach_wakeup(&sc->sc_dev);
        if (err) {
                DPRINTF(("%s: %s: write failed. off=%04x, err=%d\n",
                         sc->sc_dev.dv_xname, __func__, offset, err));
        }

        return (err);
}

int
udav_csr_read1(struct udav_softc *sc, int offset)
{
        u_int8_t val = 0;
        
        if (sc == NULL)
                return (0);

        DPRINTFN(0x200,
                ("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

        return (udav_csr_read(sc, offset, &val, 1) ? 0 : val);
}

/* write a register */
int
udav_csr_write1(struct udav_softc *sc, int offset, unsigned char ch)
{
        usb_device_request_t req;
        usbd_status err;

        if (sc == NULL)
                return (0);

        DPRINTFN(0x200,
                ("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        offset &= 0xff;

        req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
        req.bRequest = UDAV_REQ_REG_WRITE1;
        USETW(req.wValue, ch);
        USETW(req.wIndex, offset);
        USETW(req.wLength, 0x0000);

        sc->sc_refcnt++;
        err = usbd_do_request(sc->sc_udev, &req, NULL);
        if (--sc->sc_refcnt < 0)
                usb_detach_wakeup(&sc->sc_dev);
        if (err) {
                DPRINTF(("%s: %s: write failed. off=%04x, err=%d\n",
                         sc->sc_dev.dv_xname, __func__, offset, err));
        }

        return (err);
}

int
udav_init(struct ifnet *ifp)
{
        struct udav_softc *sc = ifp->if_softc;
        struct mii_data *mii = GET_MII(sc);
        u_char *eaddr;
        int s;

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

        s = splnet();

        /* Cancel pending I/O and free all TX/RX buffers */
        udav_stop(ifp, 1);

        eaddr = sc->sc_ac.ac_enaddr;
        udav_csr_write(sc, UDAV_PAR, eaddr, ETHER_ADDR_LEN);

        /* Initialize network control register */
        /*  Disable loopback  */
        UDAV_CLRBIT(sc, UDAV_NCR, UDAV_NCR_LBK0 | UDAV_NCR_LBK1);

        /* Initialize RX control register */
        UDAV_SETBIT(sc, UDAV_RCR, UDAV_RCR_DIS_LONG | UDAV_RCR_DIS_CRC);

        /* Initialize transmit ring */
        if (udav_tx_list_init(sc) == ENOBUFS) {
                printf("%s: tx list init failed\n", sc->sc_dev.dv_xname);
                splx(s);
                return (EIO);
        }

        /* Initialize receive ring */
        if (udav_rx_list_init(sc) == ENOBUFS) {
                printf("%s: rx list init failed\n", sc->sc_dev.dv_xname);
                splx(s);
                return (EIO);
        }

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

        /* Enable RX */
        UDAV_SETBIT(sc, UDAV_RCR, UDAV_RCR_RXEN);

        /* clear POWER_DOWN state of internal PHY */
        UDAV_SETBIT(sc, UDAV_GPCR, UDAV_GPCR_GEP_CNTL0);
        UDAV_CLRBIT(sc, UDAV_GPR, UDAV_GPR_GEPIO0);

        if (!(sc->sc_flags & UDAV_RD9700))
                mii_mediachg(mii);

        if (sc->sc_pipe_tx == NULL || sc->sc_pipe_rx == NULL) {
                if (udav_openpipes(sc)) {
                        splx(s);
                        return (EIO);
                }
        }

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

        splx(s);

        timeout_add_sec(&sc->sc_stat_ch, 1);

        return (0);
}

void
udav_reset(struct udav_softc *sc)
{
        int i;

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        /* Select PHY */
#if 1
        /*
         * XXX: force select internal phy.
         *      external phy routines are not tested.
         */
        UDAV_CLRBIT(sc, UDAV_NCR, UDAV_NCR_EXT_PHY);
#else
        if (sc->sc_flags & UDAV_EXT_PHY) {
                UDAV_SETBIT(sc, UDAV_NCR, UDAV_NCR_EXT_PHY);
        } else {
                UDAV_CLRBIT(sc, UDAV_NCR, UDAV_NCR_EXT_PHY);
        }
#endif

        UDAV_SETBIT(sc, UDAV_NCR, UDAV_NCR_RST);

        for (i = 0; i < UDAV_TX_TIMEOUT; i++) {
                if (!(udav_csr_read1(sc, UDAV_NCR) & UDAV_NCR_RST))
                        break;
                delay(10);      /* XXX */
        }
        delay(10000);           /* XXX */
}

#define UDAV_BITS       6

void
udav_iff(struct udav_softc *sc)
{
        struct ifnet *ifp = GET_IFP(sc);
        struct arpcom *ac = &sc->sc_ac;
        struct ether_multi *enm;
        struct ether_multistep step;
        u_int8_t hashes[8];
        int h = 0;

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        UDAV_CLRBIT(sc, UDAV_RCR, UDAV_RCR_ALL | UDAV_RCR_PRMSC);
        memset(hashes, 0x00, sizeof(hashes));
        ifp->if_flags &= ~IFF_ALLMULTI;

        if (ifp->if_flags & IFF_PROMISC || ac->ac_multirangecnt > 0) {
                ifp->if_flags |= IFF_ALLMULTI;
                UDAV_SETBIT(sc, UDAV_RCR, UDAV_RCR_ALL);
                if (ifp->if_flags & IFF_PROMISC)
                        UDAV_SETBIT(sc, UDAV_RCR, UDAV_RCR_PRMSC);
        } else {
                hashes[7] |= 0x80;      /* broadcast address */

                /* now program new ones */
                ETHER_FIRST_MULTI(step, ac, enm);
                while (enm != NULL) {
                        h = ether_crc32_le(enm->enm_addrlo, ETHER_ADDR_LEN) &
                            ((1 << UDAV_BITS) - 1);

                        hashes[h>>3] |= 1 << (h & 0x7);

                        ETHER_NEXT_MULTI(step, enm);
                }
        }

        udav_csr_write(sc, UDAV_MAR, hashes, sizeof(hashes));
}

int
udav_openpipes(struct udav_softc *sc)
{
        struct udav_chain *c;
        usbd_status err;
        int i;
        int error = 0;

        if (usbd_is_dying(sc->sc_udev))
                return (EIO);

        sc->sc_refcnt++;

        /* Open RX pipe */
        err = usbd_open_pipe(sc->sc_ctl_iface, sc->sc_bulkin_no,
                             USBD_EXCLUSIVE_USE, &sc->sc_pipe_rx);
        if (err) {
                printf("%s: open rx pipe failed: %s\n",
                       sc->sc_dev.dv_xname, usbd_errstr(err));
                error = EIO;
                goto done;
        }

        /* Open TX pipe */
        err = usbd_open_pipe(sc->sc_ctl_iface, sc->sc_bulkout_no,
                             USBD_EXCLUSIVE_USE, &sc->sc_pipe_tx);
        if (err) {
                printf("%s: open tx pipe failed: %s\n",
                       sc->sc_dev.dv_xname, usbd_errstr(err));
                error = EIO;
                goto done;
        }

#if 0
        /* XXX: interrupt endpoint is not yet supported */
        /* Open Interrupt pipe */
        err = usbd_open_pipe_intr(sc->sc_ctl_iface, sc->sc_intrin_no,
                                  0, &sc->sc_pipe_intr, sc,
                                  &sc->sc_cdata.udav_ibuf, UDAV_INTR_PKGLEN,
                                  udav_intr, UDAV_INTR_INTERVAL);
        if (err) {
                printf("%s: open intr pipe failed: %s\n",
                       sc->sc_dev.dv_xname, usbd_errstr(err));
                error = EIO;
                goto done;
        }
#endif


        /* Start up the receive pipe. */
        for (i = 0; i < UDAV_RX_LIST_CNT; i++) {
                c = &sc->sc_cdata.udav_rx_chain[i];
                usbd_setup_xfer(c->udav_xfer, sc->sc_pipe_rx,
                                c, c->udav_buf, UDAV_BUFSZ,
                                USBD_SHORT_XFER_OK | USBD_NO_COPY,
                                USBD_NO_TIMEOUT, udav_rxeof);
                (void)usbd_transfer(c->udav_xfer);
                DPRINTF(("%s: %s: start read\n", sc->sc_dev.dv_xname,
                         __func__));
        }

 done:
        if (--sc->sc_refcnt < 0)
                usb_detach_wakeup(&sc->sc_dev);

        return (error);
}

int
udav_newbuf(struct udav_softc *sc, struct udav_chain *c, struct mbuf *m)
{
        struct mbuf *m_new = NULL;

        DPRINTF(("%s: %s: enter\n", sc->sc_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->sc_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->sc_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->udav_mbuf = m_new;

        return (0);
}


int
udav_rx_list_init(struct udav_softc *sc)
{
        struct udav_cdata *cd;
        struct udav_chain *c;
        int i;

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

        cd = &sc->sc_cdata;
        for (i = 0; i < UDAV_RX_LIST_CNT; i++) {
                c = &cd->udav_rx_chain[i];
                c->udav_sc = sc;
                c->udav_idx = i;
                if (udav_newbuf(sc, c, NULL) == ENOBUFS)
                        return (ENOBUFS);
                if (c->udav_xfer == NULL) {
                        c->udav_xfer = usbd_alloc_xfer(sc->sc_udev);
                        if (c->udav_xfer == NULL)
                                return (ENOBUFS);
                        c->udav_buf = usbd_alloc_buffer(c->udav_xfer, UDAV_BUFSZ);
                        if (c->udav_buf == NULL) {
                                usbd_free_xfer(c->udav_xfer);
                                return (ENOBUFS);
                        }
                }
        }

        return (0);
}

int
udav_tx_list_init(struct udav_softc *sc)
{
        struct udav_cdata *cd;
        struct udav_chain *c;
        int i;

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

        cd = &sc->sc_cdata;
        for (i = 0; i < UDAV_TX_LIST_CNT; i++) {
                c = &cd->udav_tx_chain[i];
                c->udav_sc = sc;
                c->udav_idx = i;
                c->udav_mbuf = NULL;
                if (c->udav_xfer == NULL) {
                        c->udav_xfer = usbd_alloc_xfer(sc->sc_udev);
                        if (c->udav_xfer == NULL)
                                return (ENOBUFS);
                        c->udav_buf = usbd_alloc_buffer(c->udav_xfer, UDAV_BUFSZ);
                        if (c->udav_buf == NULL) {
                                usbd_free_xfer(c->udav_xfer);
                                return (ENOBUFS);
                        }
                }
        }

        return (0);
}

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

        DPRINTF(("%s: %s: enter, link=%d\n", sc->sc_dev.dv_xname,
                 __func__, sc->sc_link));

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

        if (!sc->sc_link)
                return;

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

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

        if (udav_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 (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;
}

int
udav_send(struct udav_softc *sc, struct mbuf *m, int idx)
{
        int total_len;
        struct udav_chain *c;
        usbd_status err;

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname,__func__));

        c = &sc->sc_cdata.udav_tx_chain[idx];

        /* Copy the mbuf data into a contiguous buffer */
        /*  first 2 bytes are packet length */
        m_copydata(m, 0, m->m_pkthdr.len, c->udav_buf + 2);
        c->udav_mbuf = m;
        total_len = m->m_pkthdr.len;
        if (total_len < UDAV_MIN_FRAME_LEN) {
                memset(c->udav_buf + 2 + total_len, 0,
                    UDAV_MIN_FRAME_LEN - total_len);
                total_len = UDAV_MIN_FRAME_LEN;
        }

        /* Frame length is specified in the first 2bytes of the buffer */
        c->udav_buf[0] = (u_int8_t)total_len;
        c->udav_buf[1] = (u_int8_t)(total_len >> 8);
        total_len += 2;

        usbd_setup_xfer(c->udav_xfer, sc->sc_pipe_tx, c, c->udav_buf, total_len,
                        USBD_FORCE_SHORT_XFER | USBD_NO_COPY,
                        UDAV_TX_TIMEOUT, udav_txeof);

        /* Transmit */
        sc->sc_refcnt++;
        err = usbd_transfer(c->udav_xfer);
        if (--sc->sc_refcnt < 0)
                usb_detach_wakeup(&sc->sc_dev);
        if (err != USBD_IN_PROGRESS) {
                printf("%s: udav_send error=%s\n", sc->sc_dev.dv_xname,
                       usbd_errstr(err));
                /* Stop the interface */
                usb_add_task(sc->sc_udev, &sc->sc_stop_task);
                return (EIO);
        }

        DPRINTF(("%s: %s: send %d bytes\n", sc->sc_dev.dv_xname,
                 __func__, total_len));

        sc->sc_cdata.udav_tx_cnt++;

        return (0);
}

void
udav_txeof(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
        struct udav_chain *c = priv;
        struct udav_softc *sc = c->udav_sc;
        struct ifnet *ifp = GET_IFP(sc);
        int s;

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

        s = splnet();

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

        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->sc_dev.dv_xname,
                       usbd_errstr(status));
                if (status == USBD_STALLED) {
                        sc->sc_refcnt++;
                        usbd_clear_endpoint_stall_async(sc->sc_pipe_tx);
                        if (--sc->sc_refcnt < 0)
                                usb_detach_wakeup(&sc->sc_dev);
                }
                splx(s);
                return;
        }

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

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

        splx(s);
}

void
udav_rxeof(struct usbd_xfer *xfer, void *priv, usbd_status status)
{
        struct udav_chain *c = priv;
        struct udav_softc *sc = c->udav_sc;
        struct ifnet *ifp = GET_IFP(sc);
        struct udav_rx_hdr *h;
        struct mbuf_list ml = MBUF_LIST_INITIALIZER();
        struct mbuf *m;
        u_int32_t total_len;
        int s;

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname,__func__));

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

        if (status != USBD_NORMAL_COMPLETION) {
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED)
                        return;
                sc->sc_rx_errs++;
                if (usbd_ratecheck(&sc->sc_rx_notice)) {
                        printf("%s: %u usb errors on rx: %s\n",
                               sc->sc_dev.dv_xname, sc->sc_rx_errs,
                               usbd_errstr(status));
                        sc->sc_rx_errs = 0;
                }
                if (status == USBD_STALLED) {
                        sc->sc_refcnt++;
                        usbd_clear_endpoint_stall_async(sc->sc_pipe_rx);
                        if (--sc->sc_refcnt < 0)
                                usb_detach_wakeup(&sc->sc_dev);
                }
                goto done;
        }

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

        if (total_len < UDAV_RX_HDRLEN) {
                ifp->if_ierrors++;
                goto done;
        }
        
        h = (struct udav_rx_hdr *)c->udav_buf;
        total_len = UGETW(h->length) - ETHER_CRC_LEN;
        
        DPRINTF(("%s: RX Status: 0x%02x\n", sc->sc_dev.dv_xname, h->pktstat));

        if (h->pktstat & UDAV_RSR_LCS) {
                ifp->if_collisions++;
                goto done;
        }

        /* RX status may still be correct but total_len is bogus */
        if (total_len < sizeof(struct ether_header) ||
            h->pktstat & UDAV_RSR_ERR ||
            total_len > UDAV_BUFSZ ) {
                ifp->if_ierrors++;
                goto done;
        }

        /* copy data to mbuf */
        m = c->udav_mbuf;
        memcpy(mtod(m, char *), c->udav_buf + UDAV_RX_HDRLEN, total_len);

        m->m_pkthdr.len = m->m_len = total_len;
        ml_enqueue(&ml, m);

        if (udav_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->sc_pipe_rx, c, c->udav_buf, UDAV_BUFSZ,
                        USBD_SHORT_XFER_OK | USBD_NO_COPY,
                        USBD_NO_TIMEOUT, udav_rxeof);
        sc->sc_refcnt++;
        usbd_transfer(xfer);
        if (--sc->sc_refcnt < 0)
                usb_detach_wakeup(&sc->sc_dev);

        DPRINTF(("%s: %s: start rx\n", sc->sc_dev.dv_xname, __func__));
}

int
udav_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
        struct udav_softc *sc = ifp->if_softc;
        struct ifreq *ifr = (struct ifreq *)data;
        int s, error = 0;

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        s = splnet();

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

        case SIOCSIFFLAGS:
                if (ifp->if_flags & IFF_UP) {
                        if (ifp->if_flags & IFF_RUNNING)
                                error = ENETRESET;
                        else
                                udav_init(ifp);
                } else {
                        if (ifp->if_flags & IFF_RUNNING)
                                udav_stop(ifp, 1);
                }
                break;

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

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

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

        splx(s);
        return (error);
}

void
udav_watchdog(struct ifnet *ifp)
{
        struct udav_softc *sc = ifp->if_softc;
        struct udav_chain *c;
        usbd_status stat;
        int s;

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        s = splusb();
        c = &sc->sc_cdata.udav_tx_chain[0];
        usbd_get_xfer_status(c->udav_xfer, NULL, NULL, NULL, &stat);
        udav_txeof(c->udav_xfer, c, stat);

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

void
udav_stop_task(struct udav_softc *sc)
{
        udav_stop(GET_IFP(sc), 1);
}

/* Stop the adapter and free any mbufs allocated to the RX and TX lists. */
void
udav_stop(struct ifnet *ifp, int disable)
{
        struct udav_softc *sc = ifp->if_softc;
        usbd_status err;
        int i;

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        udav_reset(sc);

        timeout_del(&sc->sc_stat_ch);

        /* Stop transfers */
        /* RX endpoint */
        if (sc->sc_pipe_rx != NULL) {
                err = usbd_close_pipe(sc->sc_pipe_rx);
                if (err)
                        printf("%s: close rx pipe failed: %s\n",
                               sc->sc_dev.dv_xname, usbd_errstr(err));
                sc->sc_pipe_rx = NULL;
        }

        /* TX endpoint */
        if (sc->sc_pipe_tx != NULL) {
                err = usbd_close_pipe(sc->sc_pipe_tx);
                if (err)
                        printf("%s: close tx pipe failed: %s\n",
                               sc->sc_dev.dv_xname, usbd_errstr(err));
                sc->sc_pipe_tx = NULL;
        }

#if 0
        /* XXX: Interrupt endpoint is not yet supported!! */
        /* Interrupt endpoint */
        if (sc->sc_pipe_intr != NULL) {
                err = usbd_close_pipe(sc->sc_pipe_intr);
                if (err)
                        printf("%s: close intr pipe failed: %s\n",
                               sc->sc_dev.dv_xname, usbd_errstr(err));
                sc->sc_pipe_intr = NULL;
        }
#endif

        /* Free RX resources. */
        for (i = 0; i < UDAV_RX_LIST_CNT; i++) {
                if (sc->sc_cdata.udav_rx_chain[i].udav_mbuf != NULL) {
                        m_freem(sc->sc_cdata.udav_rx_chain[i].udav_mbuf);
                        sc->sc_cdata.udav_rx_chain[i].udav_mbuf = NULL;
                }
                if (sc->sc_cdata.udav_rx_chain[i].udav_xfer != NULL) {
                        usbd_free_xfer(sc->sc_cdata.udav_rx_chain[i].udav_xfer);
                        sc->sc_cdata.udav_rx_chain[i].udav_xfer = NULL;
                }
        }

        /* Free TX resources. */
        for (i = 0; i < UDAV_TX_LIST_CNT; i++) {
                if (sc->sc_cdata.udav_tx_chain[i].udav_mbuf != NULL) {
                        m_freem(sc->sc_cdata.udav_tx_chain[i].udav_mbuf);
                        sc->sc_cdata.udav_tx_chain[i].udav_mbuf = NULL;
                }
                if (sc->sc_cdata.udav_tx_chain[i].udav_xfer != NULL) {
                        usbd_free_xfer(sc->sc_cdata.udav_tx_chain[i].udav_xfer);
                        sc->sc_cdata.udav_tx_chain[i].udav_xfer = NULL;
                }
        }

        sc->sc_link = 0;
}

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

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        sc->sc_link = 0;

        if (sc->sc_flags & UDAV_RD9700)
                return (0);

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

        return (mii_mediachg(mii));
}

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

        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));

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

        if ((ifp->if_flags & IFF_RUNNING) == 0) {
                ifmr->ifm_active = IFM_ETHER | IFM_NONE;
                ifmr->ifm_status = 0;
                return;
        }

        if (sc->sc_flags & UDAV_RD9700) {
                ifmr->ifm_active = IFM_ETHER | IFM_10_T;
                ifmr->ifm_status = IFM_AVALID;
                if (sc->sc_link) ifmr->ifm_status |= IFM_ACTIVE;
                return;
        }

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

void
udav_tick(void *xsc)
{
        struct udav_softc *sc = xsc;

        if (sc == NULL)
                return;

        DPRINTFN(0xff, ("%s: %s: enter\n", sc->sc_dev.dv_xname,
                        __func__));

        /* Perform periodic stuff in process context */
        usb_add_task(sc->sc_udev, &sc->sc_tick_task);
}

void
udav_tick_task(void *xsc)
{
        struct udav_softc *sc = xsc;
        struct ifnet *ifp;
        struct mii_data *mii;
        int s, sts;

        if (sc == NULL)
                return;

        DPRINTFN(0xff, ("%s: %s: enter\n", sc->sc_dev.dv_xname,
                        __func__));

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

        ifp = GET_IFP(sc);
        mii = GET_MII(sc);

        if (mii == NULL)
                return;

        s = splnet();

        if (sc->sc_flags & UDAV_RD9700) {
                sts = udav_csr_read1(sc, UDAV_NSR) & UDAV_NSR_LINKST;
                if (!sts)
                        sc->sc_link = 0;
        } else {
                mii_tick(mii);
                sts = (mii->mii_media_status & IFM_ACTIVE &&
                       IFM_SUBTYPE(mii->mii_media_active) != IFM_NONE) ? 1 : 0;
        }

        if (!sc->sc_link && sts) {
                DPRINTF(("%s: %s: got link\n",
                         sc->sc_dev.dv_xname, __func__));
                sc->sc_link++;
                if (ifq_empty(&ifp->if_snd) == 0)
                           udav_start(ifp);
        }

        timeout_add_sec(&sc->sc_stat_ch, 1);

        splx(s);
}

/* Get exclusive access to the MII registers */
void
udav_lock_mii(struct udav_softc *sc)
{
        DPRINTFN(0xff, ("%s: %s: enter\n", sc->sc_dev.dv_xname,
                        __func__));

        sc->sc_refcnt++;
        rw_enter_write(&sc->sc_mii_lock);
}

void
udav_unlock_mii(struct udav_softc *sc)
{
        DPRINTFN(0xff, ("%s: %s: enter\n", sc->sc_dev.dv_xname,
                       __func__));

        rw_exit_write(&sc->sc_mii_lock);
        if (--sc->sc_refcnt < 0)
                usb_detach_wakeup(&sc->sc_dev);
}

int
udav_miibus_readreg(struct device *dev, int phy, int reg)
{
        struct udav_softc *sc;
        u_int8_t val[2];
        u_int16_t data16;

        if (dev == NULL)
                return (0);

        sc = (void *)dev;

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

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

        /* XXX: one PHY only for the internal PHY */
        if (phy != 0) {
                DPRINTFN(0xff, ("%s: %s: phy=%d is not supported\n",
                         sc->sc_dev.dv_xname, __func__, phy));
                return (0);
        }

        udav_lock_mii(sc);

        /* select internal PHY and set PHY register address */
        udav_csr_write1(sc, UDAV_EPAR,
                        UDAV_EPAR_PHY_ADR0 | (reg & UDAV_EPAR_EROA_MASK));

        /* select PHY operation and start read command */
        udav_csr_write1(sc, UDAV_EPCR, UDAV_EPCR_EPOS | UDAV_EPCR_ERPRR);

        /* XXX: should be wait? */

        /* end read command */
        UDAV_CLRBIT(sc, UDAV_EPCR, UDAV_EPCR_ERPRR);

        /* retrieve the result from data registers */
        udav_csr_read(sc, UDAV_EPDRL, val, 2);

        udav_unlock_mii(sc);

        data16 = val[0] | (val[1] << 8);

        DPRINTFN(0xff, ("%s: %s: phy=%d reg=0x%04x => 0x%04x\n",
                 sc->sc_dev.dv_xname, __func__, phy, reg, data16));

        return (data16);
}

void
udav_miibus_writereg(struct device *dev, int phy, int reg, int data)
{
        struct udav_softc *sc;
        u_int8_t val[2];

        if (dev == NULL)
                return;

        sc = (void *)dev;

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

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

        /* XXX: one PHY only for the internal PHY */
        if (phy != 0) {
                DPRINTFN(0xff, ("%s: %s: phy=%d is not supported\n",
                         sc->sc_dev.dv_xname, __func__, phy));
                return;
        }

        udav_lock_mii(sc);

        /* select internal PHY and set PHY register address */
        udav_csr_write1(sc, UDAV_EPAR,
                        UDAV_EPAR_PHY_ADR0 | (reg & UDAV_EPAR_EROA_MASK));

        /* put the value to the data registers */
        val[0] = data & 0xff;
        val[1] = (data >> 8) & 0xff;
        udav_csr_write(sc, UDAV_EPDRL, val, 2);

        /* select PHY operation and start write command */
        udav_csr_write1(sc, UDAV_EPCR, UDAV_EPCR_EPOS | UDAV_EPCR_ERPRW);

        /* XXX: should be wait? */

        /* end write command */
        UDAV_CLRBIT(sc, UDAV_EPCR, UDAV_EPCR_ERPRW);

        udav_unlock_mii(sc);

        return;
}

void
udav_miibus_statchg(struct device *dev)
{
#ifdef UDAV_DEBUG
        struct udav_softc *sc;

        if (dev == NULL)
                return;

        sc = (void *)dev;
        DPRINTF(("%s: %s: enter\n", sc->sc_dev.dv_xname, __func__));
#endif
        /* Nothing to do */
}