text: /*	$NetBSD: if_udav.c,v 1.2 2003/09/04 15:17:38 tsutsui 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 1.2 2003/09/04 15:17:38 tsutsui Exp $");
  
  #include "opt_inet.h"
  #include "opt_ns.h"
  #include "bpfilter.h"
  #include "rnd.h"
  
  #include <sys/param.h>
  #include <sys/systm.h>
  #include <sys/lock.h>
  #include <sys/mbuf.h>
  #include <sys/kernel.h>
  #include <sys/socket.h>
  
  #include <sys/device.h>
  #if NRND > 0
  #include <sys/rnd.h>
  #endif
  
  #include <net/if.h>
  #include <net/if_arp.h>
  #include <net/if_dl.h>
  #include <net/if_media.h>
  
  #if NBPFILTER > 0
  #include <net/bpf.h>
  #endif
  #define	BPF_MTAP(ifp, m)	bpf_mtap((ifp)->if_bpf, (m))
  
  #include <net/if_ether.h>
  #ifdef INET
  #include <netinet/in.h>
  #include <netinet/if_inarp.h>
  #endif
  #ifdef NS
  #include <netns/ns.h>
  #include <netns/ns_if.h>
  #endif
  
  #include <dev/mii/mii.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>
  
  
  /* Function declarations */
  USB_DECLARE_DRIVER(udav);
  
  Static int udav_openpipes(struct udav_softc *);
  Static int udav_rx_list_init(struct udav_softc *);
  Static int udav_tx_list_init(struct udav_softc *);
  Static int udav_newbuf(struct udav_softc *, struct udav_chain *, struct mbuf *);
  Static void udav_start(struct ifnet *);
  Static int udav_send(struct udav_softc *, struct mbuf *, int);
  Static void udav_txeof(usbd_xfer_handle, usbd_private_handle, usbd_status);
  Static void udav_rxeof(usbd_xfer_handle, usbd_private_handle, usbd_status);
  Static void udav_tick(void *);
  Static void udav_tick_task(void *);
  Static int udav_ioctl(struct ifnet *, u_long, caddr_t);
  Static void udav_stop_task(struct udav_softc *);
  Static void udav_stop(struct ifnet *, int);
  Static void udav_watchdog(struct ifnet *);
  Static int udav_ifmedia_change(struct ifnet *);
  Static void udav_ifmedia_status(struct ifnet *, struct ifmediareq *);
  Static void udav_lock_mii(struct udav_softc *);
  Static void udav_unlock_mii(struct udav_softc *);
  Static int udav_miibus_readreg(device_ptr_t, int, int);
  Static void udav_miibus_writereg(device_ptr_t, int, int, int);
  Static void udav_miibus_statchg(device_ptr_t);
  Static int udav_init(struct ifnet *);
  Static void udav_setmulti(struct udav_softc *);
  Static void udav_reset(struct udav_softc *);
  
  Static int udav_csr_read(struct udav_softc *, int, void *, int);
  Static int udav_csr_write(struct udav_softc *, int, void *, int);
  Static int udav_csr_read1(struct udav_softc *, int);
  Static int udav_csr_write1(struct udav_softc *, int, unsigned char);
  
  #if 0
  Static int udav_mem_read(struct udav_softc *, int, void *, int);
  Static int udav_mem_write(struct udav_softc *, int, void *, int);
  Static int udav_mem_write1(struct udav_softc *, int, unsigned char);
  #endif
  
  /* Macros */
  #ifdef UDAV_DEBUG
  #define DPRINTF(x)	if (udavdebug) logprintf x
  #define DPRINTFN(n,x)	if (udavdebug >= (n)) logprintf x
  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
  } udav_devs [] = {
  	/* Corega USB-TXC */
  	{{ USB_VENDOR_COREGA, USB_PRODUCT_COREGA_FETHER_USB_TXC }, 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) ((struct udav_type *)usb_lookup(udav_devs, v, p))
  
  
  /* Probe */
  USB_MATCH(udav)
  {
  	USB_MATCH_START(udav, uaa);
  
  	if (uaa->iface != NULL)
  		return (UMATCH_NONE);
  
  	return (udav_lookup(uaa->vendor, uaa->product) != NULL ?
  		UMATCH_VENDOR_PRODUCT : UMATCH_NONE);
  }
  
  /* Attach */
  USB_ATTACH(udav)
  {
  	USB_ATTACH_START(udav, sc, uaa);
  	usbd_device_handle dev = uaa->device;
  	usbd_interface_handle iface;
  	usbd_status err;
  	usb_interface_descriptor_t *id;
  	usb_endpoint_descriptor_t *ed;
  	char devinfo[1024];
  	char *devname = USBDEVNAME(sc->sc_dev);
  	struct ifnet *ifp;
  	struct mii_data *mii;
  	u_char eaddr[ETHER_ADDR_LEN];
  	int i, s;
  
  	usbd_devinfo(dev, 0, devinfo);
  	USB_ATTACH_SETUP;
  	printf("%s: %s\n", devname, devinfo);
  
  	/* Move the device into the configured state. */
  	err = usbd_set_config_no(dev, UDAV_CONFIG_NO, 1);
  	if (err) {
  		printf("%s: setting config no failed\n", devname);
  		goto bad;
  	}
  
  	usb_init_task(&sc->sc_tick_task, udav_tick_task, sc);
  	lockinit(&sc->sc_mii_lock, PZERO, "udavmii", 0, 0);
  	usb_init_task(&sc->sc_stop_task, (void (*)(void *)) udav_stop_task, sc);
  
  	/* get control interface */
  	err = usbd_device2interface_handle(dev, UDAV_IFACE_INDEX, &iface);
  	if (err) {
  		printf("%s: failed to get interface, err=%s\n", devname,
  		       usbd_errstr(err));
  		goto bad;
  	}
  
  	sc->sc_udev = dev;
  	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("%s: couldn't get endpoint %d\n", devname, i);
  			goto bad;
  		}
  		if ((ed->bmAttributes & UE_XFERTYPE) == UE_BULK &&
  		    UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN)
  			sc->sc_bulkin_no = ed->bEndpointAddress; /* RX */
  		else if ((ed->bmAttributes & UE_XFERTYPE) == UE_BULK &&
  			 UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT)
  			sc->sc_bulkout_no = ed->bEndpointAddress; /* TX */
  		else if ((ed->bmAttributes & UE_XFERTYPE) == 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("%s: missing endpoint\n", devname);
  		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("%s: read MAC address failed\n", devname);
  		splx(s);
  		goto bad;
  	}
  
  	/* Print Ethernet Address */
  	printf("%s: Ethernet address %s\n", devname, ether_sprintf(eaddr));
  
  	/* initialize interface infomation */
  	ifp = GET_IFP(sc);
  	ifp->if_softc = sc;
  	ifp->if_mtu = ETHERMTU;
  	strncpy(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;
  	ifp->if_init = udav_init;
  	ifp->if_stop = udav_stop;
  
  	IFQ_SET_READY(&ifp->if_snd);
  
  	/*
  	 * 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);
  	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, eaddr);
  
  #if NRND > 0
  	rnd_attach_source(&sc->rnd_source, devname, RND_TYPE_NET, 0);
  #endif
  
  	usb_callout_init(sc->sc_stat_ch);
  	sc->sc_attached = 1;
  	splx(s);
  
  	usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, dev, USBDEV(sc->sc_dev));
  
  	USB_ATTACH_SUCCESS_RETURN;
  
   bad:
  	sc->sc_dying = 1;
  	USB_ATTACH_ERROR_RETURN;
  }
  
  /* detach */
  USB_DETACH(udav)
  {
  	USB_DETACH_START(udav, sc);
  	struct ifnet *ifp = GET_IFP(sc);
  	int s;
  
  	DPRINTF(("%s: %s: enter\n", USBDEVNAME(sc->sc_dev), __func__));
  
  	/* Detached before attached finished */
  	if (!sc->sc_attached)
  		return (0);
  
  	usb_uncallout(sc->sc_stat_ch, udav_tick, sc);
  
  	/* 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(USBDEV(sc->sc_dev));
  	}
  	if (ifp->if_flags & IFF_RUNNING)
  		udav_stop(GET_IFP(sc), 1);
  
  #if NRND > 0
  	rnd_detach_source(&sc->rnd_source);
  #endif
  	mii_detach(&sc->sc_mii, MII_PHY_ANY, MII_OFFSET_ANY);
  	ifmedia_delete_instance(&sc->sc_mii.mii_media, IFM_INST_ANY);
  	ether_ifdetach(ifp);
  	if_detach(ifp);
  
  #ifdef DIAGNOSTIC
  	if (sc->sc_pipe_tx != NULL)
  		printf("%s: detach has active tx endpoint.\n",
  		       USBDEVNAME(sc->sc_dev));
  	if (sc->sc_pipe_rx != NULL)
  		printf("%s: detach has active rx endpoint.\n",
  		       USBDEVNAME(sc->sc_dev));
  	if (sc->sc_pipe_intr != NULL)
  		printf("%s: detach has active intr endpoint.\n",
  		       USBDEVNAME(sc->sc_dev));
  #endif
  	sc->sc_attached = 0;
  
  	splx(s);
  
  	usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->sc_udev,
  			   USBDEV(sc->sc_dev));
  
  	return (0);
  }
  
  #if 0
  /* read memory */
  Static 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", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		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(USBDEV(sc->sc_dev));
  	if (err) {
  		DPRINTF(("%s: %s: read failed. off=%04x, err=%d\n",
  			 USBDEVNAME(sc->sc_dev), __func__, offset, err));
  	}
  
  	return (err);
  }
  
  /* write memory */
  Static 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", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		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(USBDEV(sc->sc_dev));
  	if (err) {
  		DPRINTF(("%s: %s: write failed. off=%04x, err=%d\n",
  			 USBDEVNAME(sc->sc_dev), __func__, offset, err));
  	}
  
  	return (err);
  }
  
  /* write memory */
  Static 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", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		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(USBDEV(sc->sc_dev));
  	if (err) {
  		DPRINTF(("%s: %s: write failed. off=%04x, err=%d\n",
  			 USBDEVNAME(sc->sc_dev), __func__, offset, err));
  	}
  
  	return (err);
  }
  #endif
  
  /* read register(s) */
  Static 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", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		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(USBDEV(sc->sc_dev));
  	if (err) {
  		DPRINTF(("%s: %s: read failed. off=%04x, err=%d\n",
  			 USBDEVNAME(sc->sc_dev), __func__, offset, err));
  	}
  
  	return (err);
  }
  
  /* write register(s) */
  Static 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", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		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(USBDEV(sc->sc_dev));
  	if (err) {
  		DPRINTF(("%s: %s: write failed. off=%04x, err=%d\n",
  			 USBDEVNAME(sc->sc_dev), __func__, offset, err));
  	}
  
  	return (err);
  }
  
  Static 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", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		return (0);
  
  	return (udav_csr_read(sc, offset, &val, 1) ? 0 : val);
  }
  
  /* write a register */
  Static 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", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		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(USBDEV(sc->sc_dev));
  	if (err) {
  		DPRINTF(("%s: %s: write failed. off=%04x, err=%d\n",
  			 USBDEVNAME(sc->sc_dev), __func__, offset, err));
  	}
  
  	return (err);
  }
  
  Static 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", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		return (EIO);
  
  	s = splnet();
  
  	/* Cancel pending I/O and free all TX/RX buffers */
  	udav_stop(ifp, 1);
  
  	eaddr = LLADDR(ifp->if_sadl);
  	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);
  
  	/* If we want promiscuous mode, accept all physical frames. */
  	if (ifp->if_flags & IFF_PROMISC)
  		UDAV_SETBIT(sc, UDAV_RCR, UDAV_RCR_ALL|UDAV_RCR_PRMSC);
  	else
  		UDAV_CLRBIT(sc, UDAV_RCR, UDAV_RCR_ALL|UDAV_RCR_PRMSC);
  
  	/* Initialize transmit ring */
  	if (udav_tx_list_init(sc) == ENOBUFS) {
  		printf("%s: tx list init failed\n", USBDEVNAME(sc->sc_dev));
  		splx(s);
  		return (EIO);
  	}
  
  	/* Initialize receive ring */
  	if (udav_rx_list_init(sc) == ENOBUFS) {
  		printf("%s: rx list init failed\n", USBDEVNAME(sc->sc_dev));
  		splx(s);
  		return (EIO);
  	}
  
  	/* Load the multicast filter */
  	udav_setmulti(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);
  
  	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;
  	ifp->if_flags &= ~IFF_OACTIVE;
  
  	splx(s);
  
  	usb_callout(sc->sc_stat_ch, hz, udav_tick, sc);
  
  	return (0);
  }
  
  Static void
  udav_reset(struct udav_softc *sc)
  {
  	int i;
  
  	DPRINTF(("%s: %s: enter\n", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		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 */
  }
  
  int
  udav_activate(device_ptr_t self, enum devact act)
  {
  	struct udav_softc *sc = (struct udav_softc *)self;
  
  	DPRINTF(("%s: %s: enter, act=%d\n", USBDEVNAME(sc->sc_dev),
  		 __func__, act));
  	switch (act) {
  	case DVACT_ACTIVATE:
  		return (EOPNOTSUPP);
  		break;
  
  	case DVACT_DEACTIVATE:
  		if_deactivate(&sc->sc_ec.ec_if);
  		sc->sc_dying = 1;
  		break;
  	}
  	return (0);
  }
  
  #define UDAV_BITS	6
  
  #define UDAV_CALCHASH(addr) \
  	(ether_crc32_le((addr), ETHER_ADDR_LEN) & ((1 << UDAV_BITS) - 1))
  
  Static void
  udav_setmulti(struct udav_softc *sc)
  {
  	struct ifnet *ifp;
  	struct ether_multi *enm;
  	struct ether_multistep step;
  	u_int8_t hashes[8];
  	int h = 0;
  
  	DPRINTF(("%s: %s: enter\n", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		return;
  
  	ifp = GET_IFP(sc);
  
  	if (ifp->if_flags & IFF_PROMISC) {
  		UDAV_SETBIT(sc, UDAV_RCR, UDAV_RCR_ALL|UDAV_RCR_PRMSC);
  		return;
  	} else if (ifp->if_flags & IFF_ALLMULTI) {
  	allmulti:
  		ifp->if_flags |= IFF_ALLMULTI;
  		UDAV_SETBIT(sc, UDAV_RCR, UDAV_RCR_ALL);
  		UDAV_CLRBIT(sc, UDAV_RCR, UDAV_RCR_PRMSC);
  		return;
  	}
  
  	/* first, zot all the existing hash bits */
  	memset(hashes, 0x00, sizeof(hashes));
  	hashes[7] |= 0x80;	/* broadcast address */
  	udav_csr_write(sc, UDAV_MAR, hashes, sizeof(hashes));
  
  	/* now program new ones */
  	ETHER_FIRST_MULTI(step, &sc->sc_ec, enm);
  	while (enm != NULL) {
  		if (memcmp(enm->enm_addrlo, enm->enm_addrhi,
  			   ETHER_ADDR_LEN) != 0)
  			goto allmulti;
  
  		h = UDAV_CALCHASH(enm->enm_addrlo);
  		hashes[h>>3] |= 1 << (h & 0x7);
  		ETHER_NEXT_MULTI(step, enm);
  	}
  
  	/* disable all multicast */
  	ifp->if_flags &= ~IFF_ALLMULTI;
  	UDAV_CLRBIT(sc, UDAV_RCR, UDAV_RCR_ALL);
  
  	/* write hash value to the register */
  	udav_csr_write(sc, UDAV_MAR, hashes, sizeof(hashes));
  }
  
  Static int
  udav_openpipes(struct udav_softc *sc)
  {
  	struct udav_chain *c;
  	usbd_status err;
  	int i;
  	int error = 0;
  
  	if (sc->sc_dying)
  		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",
  		       USBDEVNAME(sc->sc_dev), 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",
  		       USBDEVNAME(sc->sc_dev), 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,
  				  USBD_EXCLUSIVE_USE, &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",
  		       USBDEVNAME(sc->sc_dev), 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", USBDEVNAME(sc->sc_dev),
  			 __func__));
  	}
  
   done:
  	if (--sc->sc_refcnt < 0)
  		usb_detach_wakeup(USBDEV(sc->sc_dev));
  
  	return (error);
  }
  
  Static int
  udav_newbuf(struct udav_softc *sc, struct udav_chain *c, struct mbuf *m)
  {
  	struct mbuf *m_new = NULL;
  
  	DPRINTF(("%s: %s: enter\n", USBDEVNAME(sc->sc_dev), __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", USBDEVNAME(sc->sc_dev));
  			return (ENOBUFS);
  		}
  		MCLGET(m_new, M_DONTWAIT);
  		if (!(m_new->m_flags & M_EXT)) {
  			printf("%s: no memory for rx list "
  			       "-- packet dropped!\n", USBDEVNAME(sc->sc_dev));
  			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);
  }
  
  
  Static int
  udav_rx_list_init(struct udav_softc *sc)
  {
  	struct udav_cdata *cd;
  	struct udav_chain *c;
  	int i;
  
  	DPRINTF(("%s: %s: enter\n", USBDEVNAME(sc->sc_dev), __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);
  }
  
  Static int
  udav_tx_list_init(struct udav_softc *sc)
  {
  	struct udav_cdata *cd;
  	struct udav_chain *c;
  	int i;
  
  	DPRINTF(("%s: %s: enter\n", USBDEVNAME(sc->sc_dev), __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);
  }
  
  Static 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", USBDEVNAME(sc->sc_dev),
  		 __func__, sc->sc_link));
  
  	if (sc->sc_dying)
  		return;
  
  	if (!sc->sc_link)
  		return;
  
  	if (ifp->if_flags & IFF_OACTIVE)
  		return;
  
  	IFQ_POLL(&ifp->if_snd, m_head);
  	if (m_head == NULL)
  		return;
  
  	if (udav_send(sc, m_head, 0)) {
  		ifp->if_flags |= IFF_OACTIVE;
  		return;
  	}
  
  	IFQ_DEQUEUE(&ifp->if_snd, m_head);
  
  #if NBPFILTER > 0
  	if (ifp->if_bpf)
  		bpf_mtap(ifp->if_bpf, m_head);
  #endif
  
  	ifp->if_flags |= IFF_OACTIVE;
  
  	/* Set a timeout in case the chip goes out to lunch. */
  	ifp->if_timer = 5;
  }
  
  Static 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", USBDEVNAME(sc->sc_dev),__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(USBDEV(sc->sc_dev));
  	if (err != USBD_IN_PROGRESS) {
  		printf("%s: udav_send error=%s\n", USBDEVNAME(sc->sc_dev),
  		       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", USBDEVNAME(sc->sc_dev),
  		 __func__, total_len));
  
  	sc->sc_cdata.udav_tx_cnt++;
  
  	return (0);
  }
  
  Static void
  udav_txeof(usbd_xfer_handle xfer, usbd_private_handle 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 (sc->sc_dying)
  		return;
  
  	s = splnet();
  
  	DPRINTF(("%s: %s: enter\n", USBDEVNAME(sc->sc_dev), __func__));
  
  	ifp->if_timer = 0;
  	ifp->if_flags &= ~IFF_OACTIVE;
  
  	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", USBDEVNAME(sc->sc_dev),
  		       usbd_errstr(status));
  		if (status == USBD_STALLED) {
  			sc->sc_refcnt++;
  			usbd_clear_endpoint_stall(sc->sc_pipe_tx);
  			if (--sc->sc_refcnt < 0)
  				usb_detach_wakeup(USBDEV(sc->sc_dev));
  		}
  		splx(s);
  		return;
  	}
  
  	ifp->if_opackets++;
  
  	m_freem(c->udav_mbuf);
  	c->udav_mbuf = NULL;
  
  	if (IFQ_IS_EMPTY(&ifp->if_snd) == 0)
  		udav_start(ifp);
  
  	splx(s);
  }
  
  Static void
  udav_rxeof(usbd_xfer_handle xfer, usbd_private_handle priv, usbd_status status)
  {
  	struct udav_chain *c = priv;
  	struct udav_softc *sc = c->udav_sc;
  	struct ifnet *ifp = GET_IFP(sc);
  	struct mbuf *m;
  	u_int32_t total_len;
  	u_int8_t *pktstat;
  	int s;
  
  	DPRINTF(("%s: %s: enter\n", USBDEVNAME(sc->sc_dev),__func__));
  
  	if (sc->sc_dying)
  		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",
  			       USBDEVNAME(sc->sc_dev), sc->sc_rx_errs,
  			       usbd_errstr(status));
  			sc->sc_rx_errs = 0;
  		}
  		if (status == USBD_STALLED) {
  			sc->sc_refcnt++;
  			usbd_clear_endpoint_stall(sc->sc_pipe_rx);
  			if (--sc->sc_refcnt < 0)
  				usb_detach_wakeup(USBDEV(sc->sc_dev));
  		}
  		goto done;
  	}
  
  	usbd_get_xfer_status(xfer, NULL, NULL, &total_len, NULL);
  
  	/* copy data to mbuf */
  	m = c->udav_mbuf;
  	memcpy(mtod(m, char *), c->udav_buf, total_len);
  
  	/* first byte in received data */
  	pktstat = mtod(m, u_int8_t *);
  	m_adj(m, sizeof(u_int8_t));
  	DPRINTF(("%s: RX Status: 0x%02x\n", *pktstat));
  
  	total_len = UGETW(mtod(m, u_int8_t *));
  	m_adj(m, sizeof(u_int16_t));
  
  	if (*pktstat & UDAV_RSR_LCS) {
  		ifp->if_collisions++;
  		goto done;
  	}
  
  	if (total_len < sizeof(struct ether_header) ||
  	    *pktstat & UDAV_RSR_ERR) {
  		ifp->if_ierrors++;
  		goto done;
  	}
  
  	ifp->if_ipackets++;
  	total_len -= ETHER_CRC_LEN;
  
  	m->m_pkthdr.len = m->m_len = total_len;
  	m->m_pkthdr.rcvif = ifp;
  
  	s = splnet();
  
  	if (udav_newbuf(sc, c, NULL) == ENOBUFS) {
  		ifp->if_ierrors++;
  		goto done1;
  	}
  
  #if NBPFILTER > 0
  	if (ifp->if_bpf)
  		BPF_MTAP(ifp, m);
  #endif
  
  	DPRINTF(("%s: %s: deliver %d\n", USBDEVNAME(sc->sc_dev),
  		 __func__, m->m_len));
  	IF_INPUT(ifp, m);
  
   done1:
  	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(USBDEV(sc->sc_dev));
  
  	DPRINTF(("%s: %s: start rx\n", USBDEVNAME(sc->sc_dev), __func__));
  }
  
  #if 0
  Static void udav_intr()
  {
  }
  #endif
  
  Static 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;
  	struct mii_data *mii;
  	int s, error = 0;
  
  	DPRINTF(("%s: %s: enter\n", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		return (EIO);
  
  	s = splnet();
  
  	switch (cmd) {
  	case SIOCGIFMEDIA:
  	case SIOCSIFMEDIA:
  		mii = GET_MII(sc);
  		error = ifmedia_ioctl(ifp, ifr, &mii->mii_media, cmd);
  		break;
  
  	default:
  		error = ether_ioctl(ifp, cmd, data);
  		if (error == ENETRESET) {
  			udav_setmulti(sc);
  			error = 0;
  		}
  		break;
  	}
  
  	splx(s);
  
  	return (error);
  }
  
  Static 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", USBDEVNAME(sc->sc_dev), __func__));
  
  	ifp->if_oerrors++;
  	printf("%s: watchdog timeout\n", USBDEVNAME(sc->sc_dev));
  
  	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_IS_EMPTY(&ifp->if_snd) == 0)
  		udav_start(ifp);
  	splx(s);
  }
  
  Static 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. */
  Static 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", USBDEVNAME(sc->sc_dev), __func__));
  
  	ifp->if_timer = 0;
  
  	udav_reset(sc);
  
  	usb_uncallout(sc->sc_stat_ch, udav_tick, sc);
  
  	/* Stop transfers */
  	/* RX endpoint */
  	if (sc->sc_pipe_rx != NULL) {
  		err = usbd_abort_pipe(sc->sc_pipe_rx);
  		if (err)
  			printf("%s: abort rx pipe failed: %s\n",
  			       USBDEVNAME(sc->sc_dev), usbd_errstr(err));
  		err = usbd_close_pipe(sc->sc_pipe_rx);
  		if (err)
  			printf("%s: close rx pipe failed: %s\n",
  			       USBDEVNAME(sc->sc_dev), usbd_errstr(err));
  		sc->sc_pipe_rx = NULL;
  	}
  
  	/* TX endpoint */
  	if (sc->sc_pipe_tx != NULL) {
  		err = usbd_abort_pipe(sc->sc_pipe_tx);
  		if (err)
  			printf("%s: abort tx pipe failed: %s\n",
  			       USBDEVNAME(sc->sc_dev), usbd_errstr(err));
  		err = usbd_close_pipe(sc->sc_pipe_tx);
  		if (err)
  			printf("%s: close tx pipe failed: %s\n",
  			       USBDEVNAME(sc->sc_dev), 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_abort_pipe(sc->sc_pipe_intr);
  		if (err)
  			printf("%s: abort intr pipe failed: %s\n",
  			       USBDEVNAME(sc->sc_dev), usbd_errstr(err));
  		err = usbd_close_pipe(sc->sc_pipe_intr);
  		if (err)
  			printf("%s: close intr pipe failed: %s\n",
  			       USBDEVNAME(sc->sc_dev), 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;
  	ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
  }
  
  /* Set media options */
  Static 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", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		return (0);
  
  	sc->sc_link = 0;
  	if (mii->mii_instance) {
  		struct mii_softc *miisc;
  		for (miisc = LIST_FIRST(&mii->mii_phys); miisc != NULL;
  		     miisc = LIST_NEXT(miisc, mii_list))
  			mii_phy_reset(miisc);
  	}
  
  	return (mii_mediachg(mii));
  }
  
  /* Report current media status. */
  Static 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", USBDEVNAME(sc->sc_dev), __func__));
  
  	if (sc->sc_dying)
  		return;
  
  	if ((ifp->if_flags & IFF_RUNNING) == 0) {
  		ifmr->ifm_active = IFM_ETHER | IFM_NONE;
  		ifmr->ifm_status = 0;
  		return;
  	}
  
  	mii_pollstat(mii);
  	ifmr->ifm_active = mii->mii_media_active;
  	ifmr->ifm_status = mii->mii_media_status;
  }
  
  Static void
  udav_tick(void *xsc)
  {
  	struct udav_softc *sc = xsc;
  
  	if (sc == NULL)
  		return;
  
  	DPRINTFN(0xff, ("%s: %s: enter\n", USBDEVNAME(sc->sc_dev),
  			__func__));
  
  	if (sc->sc_dying)
  		return;
  
  	/* Perform periodic stuff in process context */
  	usb_add_task(sc->sc_udev, &sc->sc_tick_task);
  }
  
  Static void
  udav_tick_task(void *xsc)
  {
  	struct udav_softc *sc = xsc;
  	struct ifnet *ifp;
  	struct mii_data *mii;
  	int s;
  
  	if (sc == NULL)
  		return;
  
  	DPRINTFN(0xff, ("%s: %s: enter\n", USBDEVNAME(sc->sc_dev),
  			__func__));
  
  	if (sc->sc_dying)
  		return;
  
  	ifp = GET_IFP(sc);
  	mii = GET_MII(sc);
  
  	if (mii == NULL)
  		return;
  
  	s = splnet();
  
  	mii_tick(mii);
  	if (!sc->sc_link) {
  		mii_pollstat(mii);
  		if (mii->mii_media_status & IFM_ACTIVE &&
  		    IFM_SUBTYPE(mii->mii_media_active) != IFM_NONE) {
  			DPRINTF(("%s: %s: got link\n",
  				 USBDEVNAME(sc->sc_dev), __func__));
  			sc->sc_link++;
  			if (IFQ_IS_EMPTY(&ifp->if_snd) == 0)
  				   udav_start(ifp);
  		}
  	}
  
  	usb_callout(sc->sc_stat_ch, hz, udav_tick, sc);
  
  	splx(s);
  }
  
  /* Get exclusive access to the MII registers */
  Static void
  udav_lock_mii(struct udav_softc *sc)
  {
  	DPRINTFN(0xff, ("%s: %s: enter\n", USBDEVNAME(sc->sc_dev),
  			__func__));
  
  	sc->sc_refcnt++;
  	lockmgr(&sc->sc_mii_lock, LK_EXCLUSIVE, NULL);
  }
  
  Static void
  udav_unlock_mii(struct udav_softc *sc)
  {
  	DPRINTFN(0xff, ("%s: %s: enter\n", USBDEVNAME(sc->sc_dev),
  		       __func__));
  
  	lockmgr(&sc->sc_mii_lock, LK_RELEASE, NULL);
  	if (--sc->sc_refcnt < 0)
  		usb_detach_wakeup(USBDEV(sc->sc_dev));
  }
  
  Static int
  udav_miibus_readreg(device_ptr_t dev, int phy, int reg)
  {
  	struct udav_softc *sc;
  	u_int8_t val[2];
  	u_int16_t data16;
  
  	if (dev == NULL)
  		return (0);
  
  	sc = USBGETSOFTC(dev);
  
  	DPRINTFN(0xff, ("%s: %s: enter, phy=%d reg=0x%04x\n",
  		 USBDEVNAME(sc->sc_dev), __func__, phy, reg));
  
  	if (sc->sc_dying) {
  #ifdef DIAGNOSTIC
  		printf("%s: %s: dying\n", USBDEVNAME(sc->sc_dev),
  		       __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",
  			 USBDEVNAME(sc->sc_dev), __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",
  		 USBDEVNAME(sc->sc_dev), __func__, phy, reg, data16));
  
  	return (data16);
  }
  
  Static void
  udav_miibus_writereg(device_ptr_t dev, int phy, int reg, int data)
  {
  	struct udav_softc *sc;
  	u_int8_t val[2];
  
  	if (dev == NULL)
  		return;
  
  	sc = USBGETSOFTC(dev);
  
  	DPRINTFN(0xff, ("%s: %s: enter, phy=%d reg=0x%04x data=0x%04x\n",
  		 USBDEVNAME(sc->sc_dev), __func__, phy, reg, data));
  
  	if (sc->sc_dying) {
  #ifdef DIAGNOSTIC
  		printf("%s: %s: dying\n", USBDEVNAME(sc->sc_dev),
  		       __func__);
  #endif
  		return;
  	}
  
  	/* XXX: one PHY only for the internal PHY */
  	if (phy != 0) {
  		DPRINTFN(0xff, ("%s: %s: phy=%d is not supported\n",
  			 USBDEVNAME(sc->sc_dev), __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;
  }
  
  Static void
  udav_miibus_statchg(device_ptr_t dev)
  {
  #ifdef UDAV_DEBUG
  	struct udav_softc *sc;
  
  	if (dev == NULL)
  		return;
  
  	sc = USBGETSOFTC(dev);
  	DPRINTF(("%s: %s: enter\n", USBDEVNAME(sc->sc_dev), __func__));
  #endif
  	/* Nothing to do */
  }
  