/*      $NetBSD: if_udav.c,v 1.99 2022/08/20 14:09:20 riastradh 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.
 *
 * 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.davicom.com.tw/big5/download/Data%20Sheet/DM9601-DS-F01-062202s.pdf
 */

/*
 * TODO:
 *      Interrupt Endpoint support
 *      External PHYs
 *      powerhook() support?
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_udav.c,v 1.99 2022/08/20 14:09:20 riastradh Exp $");

#ifdef _KERNEL_OPT
#include "opt_usb.h"
#endif

#include <sys/param.h>

#include <dev/usb/usbnet.h>
#include <dev/usb/if_udavreg.h>

/* Function declarations */
static int      udav_match(device_t, cfdata_t, void *);
static void     udav_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(udav, sizeof(struct usbnet), udav_match, udav_attach,
    usbnet_detach, usbnet_activate);

static void udav_chip_init(struct usbnet *);

static unsigned udav_uno_tx_prepare(struct usbnet *, struct mbuf *,
                                    struct usbnet_chain *);
static void udav_uno_rx_loop(struct usbnet *, struct usbnet_chain *, uint32_t);
static void udav_uno_stop(struct ifnet *, int);
static void udav_uno_mcast(struct ifnet *);
static int udav_uno_mii_read_reg(struct usbnet *, int, int, uint16_t *);
static int udav_uno_mii_write_reg(struct usbnet *, int, int, uint16_t);
static void udav_uno_mii_statchg(struct ifnet *);
static int udav_uno_init(struct ifnet *);
static void udav_reset(struct usbnet *);

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

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

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

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

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

static const struct udav_type {
        struct usb_devno udav_dev;
        uint16_t udav_flags;
#define UDAV_EXT_PHY    0x0001
#define UDAV_NO_PHY     0x0002
} udav_devs [] = {
        /* Corega USB-TXC */
        {{ USB_VENDOR_COREGA, USB_PRODUCT_COREGA_FETHER_USB_TXC }, 0},
        /* ShanTou ST268 USB NIC */
        {{ USB_VENDOR_SHANTOU, USB_PRODUCT_SHANTOU_ST268_USB_NIC }, 0},
        /* ShanTou ADM8515 */
        {{ USB_VENDOR_SHANTOU, USB_PRODUCT_SHANTOU_ADM8515 }, 0},
        /* SUNRISING SR9600 */
        {{ USB_VENDOR_SUNRISING, USB_PRODUCT_SUNRISING_SR9600 }, 0 },
        /* SUNRISING QF9700 */
        {{ USB_VENDOR_SUNRISING, USB_PRODUCT_SUNRISING_QF9700 }, UDAV_NO_PHY },
        /* QUAN DM9601 */
        {{USB_VENDOR_QUAN, USB_PRODUCT_QUAN_DM9601 }, 0},
#if 0
        /* DAVICOM DM9601 Generic? */
        /*  XXX: The following ids was obtained from the data sheet. */
        {{ 0x0a46, 0x9601 }, 0},
#endif
};
#define udav_lookup(v, p) ((const struct udav_type *)usb_lookup(udav_devs, v, p))

static const struct usbnet_ops udav_ops = {
        .uno_stop = udav_uno_stop,
        .uno_mcast = udav_uno_mcast,
        .uno_read_reg = udav_uno_mii_read_reg,
        .uno_write_reg = udav_uno_mii_write_reg,
        .uno_statchg = udav_uno_mii_statchg,
        .uno_tx_prepare = udav_uno_tx_prepare,
        .uno_rx_loop = udav_uno_rx_loop,
        .uno_init = udav_uno_init,
};

/* Probe */
static int
udav_match(device_t parent, cfdata_t match, void *aux)
{
        struct usb_attach_arg *uaa = aux;

        return udav_lookup(uaa->uaa_vendor, uaa->uaa_product) != NULL ?
                UMATCH_VENDOR_PRODUCT : UMATCH_NONE;
}

/* Attach */
static void
udav_attach(device_t parent, device_t self, void *aux)
{
        USBNET_MII_DECL_DEFAULT(unm);
        struct usbnet_mii *unmp;
        struct usbnet * const un = device_private(self);
        struct usb_attach_arg *uaa = aux;
        struct usbd_device *dev = uaa->uaa_device;
        struct usbd_interface *iface;
        usbd_status err;
        usb_interface_descriptor_t *id;
        usb_endpoint_descriptor_t *ed;
        char *devinfop;
        int i;

        aprint_naive("\n");
        aprint_normal("\n");
        devinfop = usbd_devinfo_alloc(dev, 0);
        aprint_normal_dev(self, "%s\n", devinfop);
        usbd_devinfo_free(devinfop);

        un->un_dev = self;
        un->un_udev = dev;
        un->un_sc = un;
        un->un_ops = &udav_ops;
        un->un_rx_xfer_flags = USBD_SHORT_XFER_OK;
        un->un_tx_xfer_flags = USBD_FORCE_SHORT_XFER;
        un->un_rx_list_cnt = UDAV_RX_LIST_CNT;
        un->un_tx_list_cnt = UDAV_TX_LIST_CNT;
        un->un_rx_bufsz = UDAV_BUFSZ;
        un->un_tx_bufsz = UDAV_BUFSZ;

        /* Move the device into the configured state. */
        err = usbd_set_config_no(dev, UDAV_CONFIG_NO, 1); /* idx 0 */
        if (err) {
                aprint_error_dev(self, "failed to set configuration"
                    ", err=%s\n", usbd_errstr(err));
                return;
        }

        /* get control interface */
        err = usbd_device2interface_handle(dev, UDAV_IFACE_INDEX, &iface);
        if (err) {
                aprint_error_dev(self, "failed to get interface, err=%s\n",
                       usbd_errstr(err));
                return;
        }

        un->un_iface = iface;
        un->un_flags = udav_lookup(uaa->uaa_vendor,
            uaa->uaa_product)->udav_flags;

        /* get interface descriptor */
        id = usbd_get_interface_descriptor(un->un_iface);

        /* find endpoints */
        un->un_ed[USBNET_ENDPT_RX] = un->un_ed[USBNET_ENDPT_TX] =
            un->un_ed[USBNET_ENDPT_INTR] = -1;
        for (i = 0; i < id->bNumEndpoints; i++) {
                ed = usbd_interface2endpoint_descriptor(un->un_iface, i);
                if (ed == NULL) {
                        aprint_error_dev(self, "couldn't get endpoint %d\n", i);
                        return;
                }
                if ((ed->bmAttributes & UE_XFERTYPE) == UE_BULK &&
                    UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN)
                        un->un_ed[USBNET_ENDPT_RX] = ed->bEndpointAddress;
                else if ((ed->bmAttributes & UE_XFERTYPE) == UE_BULK &&
                         UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT)
                        un->un_ed[USBNET_ENDPT_TX] = ed->bEndpointAddress;
                else if ((ed->bmAttributes & UE_XFERTYPE) == UE_INTERRUPT &&
                         UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN)
                        un->un_ed[USBNET_ENDPT_INTR] = ed->bEndpointAddress;
        }

        if (un->un_ed[USBNET_ENDPT_RX] == 0 ||
            un->un_ed[USBNET_ENDPT_TX] == 0 ||
            un->un_ed[USBNET_ENDPT_INTR] == 0) {
                aprint_error_dev(self, "missing endpoint\n");
                return;
        }

        /* Not supported yet. */
        un->un_ed[USBNET_ENDPT_INTR] = 0;

        usbnet_attach(un);

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

        /* Get Ethernet Address */
        err = udav_csr_read(un, UDAV_PAR, un->un_eaddr, ETHER_ADDR_LEN);
        if (err) {
                aprint_error_dev(self, "read MAC address failed\n");
                return;
        }

        if (ISSET(un->un_flags, UDAV_NO_PHY))
                unmp = NULL;
        else
                unmp = &unm;

        /* initialize interface information */
        usbnet_attach_ifp(un, IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST,
            0, unmp);

        return;
}

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

        DPRINTFN(0x200,
                ("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        if (usbnet_isdying(un))
                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);

        err = usbd_do_request(un->un_udev, &req, buf);
        if (err) {
                DPRINTF(("%s: %s: read failed. off=%04x, err=%d\n",
                         device_xname(un->un_dev), __func__, offset, err));
        }

        return err;
}

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

        DPRINTFN(0x200,
                ("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        if (usbnet_isdying(un))
                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);

        err = usbd_do_request(un->un_udev, &req, buf);
        if (err) {
                DPRINTF(("%s: %s: write failed. off=%04x, err=%d\n",
                         device_xname(un->un_dev), __func__, offset, err));
        }

        return err;
}

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

        DPRINTFN(0x200,
                ("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        if (usbnet_isdying(un))
                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);

        err = usbd_do_request(un->un_udev, &req, NULL);
        if (err) {
                DPRINTF(("%s: %s: write failed. off=%04x, err=%d\n",
                         device_xname(un->un_dev), __func__, offset, err));
        }

        return err;
}
#endif

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

        if (usbnet_isdying(un))
                return USBD_IOERROR;

        DPRINTFN(0x200,
                ("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        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);

        err = usbd_do_request(un->un_udev, &req, buf);
        if (err) {
                DPRINTF(("%s: %s: read failed. off=%04x, err=%d\n",
                         device_xname(un->un_dev), __func__, offset, err));
                memset(buf, 0, len);
        }

        return err;
}

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

        if (usbnet_isdying(un))
                return USBD_IOERROR;

        DPRINTFN(0x200,
                ("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        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);

        err = usbd_do_request(un->un_udev, &req, buf);
        if (err) {
                DPRINTF(("%s: %s: write failed. off=%04x, err=%d\n",
                         device_xname(un->un_dev), __func__, offset, err));
        }

        return err;
}

static int
udav_csr_read1(struct usbnet *un, int offset)
{
        uint8_t val = 0;

        DPRINTFN(0x200,
                ("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        if (usbnet_isdying(un))
                return 0;

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

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

        if (usbnet_isdying(un))
                return USBD_IOERROR;

        DPRINTFN(0x200,
                ("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        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);

        err = usbd_do_request(un->un_udev, &req, NULL);
        if (err) {
                DPRINTF(("%s: %s: write failed. off=%04x, err=%d\n",
                         device_xname(un->un_dev), __func__, offset, err));
        }

        return err;
}

static int
udav_uno_init(struct ifnet *ifp)
{
        struct usbnet * const un = ifp->if_softc;
        struct mii_data * const mii = usbnet_mii(un);
        uint8_t eaddr[ETHER_ADDR_LEN];
        int rc = 0;

        DPRINTF(("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        memcpy(eaddr, CLLADDR(ifp->if_sadl), sizeof(eaddr));
        udav_csr_write(un, UDAV_PAR, eaddr, ETHER_ADDR_LEN);

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

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

        /* If we want promiscuous mode, accept all physical frames. */
        if (usbnet_ispromisc(un))
                UDAV_SETBIT(un, UDAV_RCR, UDAV_RCR_ALL | UDAV_RCR_PRMSC);
        else
                UDAV_CLRBIT(un, UDAV_RCR, UDAV_RCR_ALL | UDAV_RCR_PRMSC);

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

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

        if (mii && (rc = mii_mediachg(mii)) == ENXIO)
                rc = 0;

        if (rc != 0) {
                return rc;
        }

        if (usbnet_isdying(un))
                return EIO;

        return 0;
}

static void
udav_reset(struct usbnet *un)
{

        if (usbnet_isdying(un))
                return;

        DPRINTF(("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        udav_chip_init(un);
}

static void
udav_chip_init(struct usbnet *un)
{

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

        UDAV_SETBIT(un, UDAV_NCR, UDAV_NCR_RST);

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

#define UDAV_BITS       6

#define UDAV_CALCHASH(addr) \
        (ether_crc32_le((addr), ETHER_ADDR_LEN) & ((1 << UDAV_BITS) - 1))

static void
udav_uno_mcast(struct ifnet *ifp)
{
        struct usbnet * const un = ifp->if_softc;
        struct ethercom *ec = usbnet_ec(un);
        struct ether_multi *enm;
        struct ether_multistep step;
        uint8_t hashes[8];
        int h = 0;

        DPRINTF(("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        if (usbnet_isdying(un))
                return;

        if (ISSET(un->un_flags, UDAV_NO_PHY)) {
                UDAV_SETBIT(un, UDAV_RCR, UDAV_RCR_ALL);
                UDAV_SETBIT(un, UDAV_RCR, UDAV_RCR_PRMSC);
                return;
        }

        if (usbnet_ispromisc(un)) {
                ETHER_LOCK(ec);
                ec->ec_flags |= ETHER_F_ALLMULTI;
                ETHER_UNLOCK(ec);
                UDAV_SETBIT(un, UDAV_RCR, UDAV_RCR_ALL | UDAV_RCR_PRMSC);
                return;
        }

        /* first, zot all the existing hash bits */
        memset(hashes, 0x00, sizeof(hashes));
        hashes[7] |= 0x80;      /* broadcast address */
        udav_csr_write(un, UDAV_MAR, hashes, sizeof(hashes));

        /* now program new ones */
        ETHER_LOCK(ec);
        ETHER_FIRST_MULTI(step, ec, enm);
        while (enm != NULL) {
                if (memcmp(enm->enm_addrlo, enm->enm_addrhi,
                    ETHER_ADDR_LEN) != 0) {
                        ec->ec_flags |= ETHER_F_ALLMULTI;
                        ETHER_UNLOCK(ec);
                        UDAV_SETBIT(un, UDAV_RCR, UDAV_RCR_ALL);
                        UDAV_CLRBIT(un, UDAV_RCR, UDAV_RCR_PRMSC);
                        return;
                }

                h = UDAV_CALCHASH(enm->enm_addrlo);
                hashes[h>>3] |= 1 << (h & 0x7);
                ETHER_NEXT_MULTI(step, enm);
        }
        ec->ec_flags &= ~ETHER_F_ALLMULTI;
        ETHER_UNLOCK(ec);

        /* disable all multicast */
        UDAV_CLRBIT(un, UDAV_RCR, UDAV_RCR_ALL);

        /* write hash value to the register */
        udav_csr_write(un, UDAV_MAR, hashes, sizeof(hashes));
}

static unsigned
udav_uno_tx_prepare(struct usbnet *un, struct mbuf *m, struct usbnet_chain *c)
{
        int total_len;
        uint8_t *buf = c->unc_buf;

        DPRINTF(("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        if ((unsigned)m->m_pkthdr.len > un->un_tx_bufsz - 2)
                return 0;

        /* Copy the mbuf data into a contiguous buffer */
        m_copydata(m, 0, m->m_pkthdr.len, buf + 2);
        total_len = m->m_pkthdr.len;
        if (total_len < UDAV_MIN_FRAME_LEN) {
                memset(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 */
        buf[0] = (uint8_t)total_len;
        buf[1] = (uint8_t)(total_len >> 8);
        total_len += 2;

        DPRINTF(("%s: %s: send %d bytes\n", device_xname(un->un_dev),
            __func__, total_len));

        return total_len;
}

static void
udav_uno_rx_loop(struct usbnet *un, struct usbnet_chain *c, uint32_t total_len)
{
        struct ifnet *ifp = usbnet_ifp(un);
        uint8_t *buf = c->unc_buf;
        uint16_t pkt_len;
        uint8_t pktstat;

        DPRINTF(("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        /* first byte in received data */
        pktstat = *buf;
        total_len -= sizeof(pktstat);
        buf += sizeof(pktstat);

        DPRINTF(("%s: RX Status: 0x%02x\n", device_xname(un->un_dev), pktstat));

        pkt_len = UGETW(buf);
        total_len -= sizeof(pkt_len);
        buf += sizeof(pkt_len);

        DPRINTF(("%s: RX Length: 0x%02x\n", device_xname(un->un_dev), pkt_len));

        if (pktstat & UDAV_RSR_LCS) {
                if_statinc(ifp, if_collisions);
                return;
        }

        if (pkt_len < sizeof(struct ether_header) ||
            pkt_len > total_len ||
            (pktstat & UDAV_RSR_ERR)) {
                if_statinc(ifp, if_ierrors);
                return;
        }

        pkt_len -= ETHER_CRC_LEN;

        DPRINTF(("%s: Rx deliver: 0x%02x\n", device_xname(un->un_dev), pkt_len));

        usbnet_enqueue(un, buf, pkt_len, 0, 0, 0);
}

/* Stop the adapter and free any mbufs allocated to the RX and TX lists. */
static void
udav_uno_stop(struct ifnet *ifp, int disable)
{
        struct usbnet * const un = ifp->if_softc;

        DPRINTF(("%s: %s: enter\n", device_xname(un->un_dev), __func__));

        udav_reset(un);
}

static int
udav_uno_mii_read_reg(struct usbnet *un, int phy, int reg, uint16_t *val)
{
        uint8_t data[2];

        DPRINTFN(0xff, ("%s: %s: enter, phy=%d reg=0x%04x\n",
                 device_xname(un->un_dev), __func__, phy, reg));

        if (usbnet_isdying(un)) {
#ifdef DIAGNOSTIC
                printf("%s: %s: dying\n", device_xname(un->un_dev),
                       __func__);
#endif
                *val = 0;
                return EINVAL;
        }

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

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

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

        /* XXX: should be wait? */

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

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

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

        DPRINTFN(0xff, ("%s: %s: phy=%d reg=0x%04x => 0x%04hx\n",
                device_xname(un->un_dev), __func__, phy, reg, *val));

        return 0;
}

static int
udav_uno_mii_write_reg(struct usbnet *un, int phy, int reg, uint16_t val)
{
        uint8_t data[2];

        DPRINTFN(0xff, ("%s: %s: enter, phy=%d reg=0x%04x val=0x%04hx\n",
                 device_xname(un->un_dev), __func__, phy, reg, val));

        if (usbnet_isdying(un)) {
#ifdef DIAGNOSTIC
                printf("%s: %s: dying\n", device_xname(un->un_dev),
                       __func__);
#endif
                return EIO;
        }

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

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

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

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

        /* XXX: should be wait? */

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

        return 0;
}

static void
udav_uno_mii_statchg(struct ifnet *ifp)
{
        struct usbnet * const un = ifp->if_softc;
        struct mii_data * const mii = usbnet_mii(un);

        DPRINTF(("%s: %s: enter\n", ifp->if_xname, __func__));

        if (usbnet_isdying(un))
                return;

        if ((mii->mii_media_status & IFM_ACTIVE) &&
            IFM_SUBTYPE(mii->mii_media_active) != IFM_NONE) {
                DPRINTF(("%s: %s: got link\n",
                         device_xname(un->un_dev), __func__));
                usbnet_set_link(un, true);
        }
}

#ifdef _MODULE
#include "ioconf.c"
#endif

USBNET_MODULE(udav)