No empty .Rs/.Re

[netbsd-mini2440.git] / sys / dev / usb / if_axe.c

/*      $NetBSD: if_axe.c,v 1.29 2009/09/23 19:07:19 plunky Exp $       */

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

/*
 * ASIX Electronics AX88172 USB 2.0 ethernet driver. Used in the
 * LinkSys USB200M and various other adapters.
 *
 * Manuals available from:
 * http://www.asix.com.tw/datasheet/mac/Ax88172.PDF
 * (also http://people.freebsd.org/~wpaul/ASIX/Ax88172.PDF)
 * Note: you need the manual for the AX88170 chip (USB 1.x ethernet
 * controller) to find the definitions for the RX control register.
 * http://www.asix.com.tw/datasheet/mac/Ax88170.PDF
 *
 * Written by Bill Paul <wpaul@windriver.com>
 * Senior Engineer
 * Wind River Systems
 */

/*
 * The AX88172 provides USB ethernet supports at 10 and 100Mbps.
 * It uses an external PHY (reference designs use a RealTek chip),
 * and has a 64-bit multicast hash filter. There is some information
 * missing from the manual which one needs to know in order to make
 * the chip function:
 *
 * - You must set bit 7 in the RX control register, otherwise the
 *   chip won't receive any packets.
 * - You must initialize all 3 IPG registers, or you won't be able
 *   to send any packets.
 *
 * Note that this device appears to only support loading the station
 * address via autload from the EEPROM (i.e. there's no way to manaully
 * set it).
 *
 * (Adam Weinberger wanted me to name this driver if_gir.c.)
 */

/*
 * Ported to OpenBSD 3/28/2004 by Greg Taleck <taleck@oz.net>
 * with bits and pieces from the aue and url drivers.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: if_axe.c,v 1.29 2009/09/23 19:07:19 plunky Exp $");

#if defined(__NetBSD__)
#include "opt_inet.h"
#include "rnd.h"
#endif

#include "bpfilter.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/mutex.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#if defined(__OpenBSD__)
#include <sys/proc.h>
#endif
#include <sys/socket.h>

#include <sys/device.h>
#if NRND > 0
#include <sys/rnd.h>
#endif

#include <net/if.h>
#if defined(__NetBSD__)
#include <net/if_arp.h>
#endif
#include <net/if_dl.h>
#include <net/if_media.h>

#define BPF_MTAP(ifp, m) bpf_mtap((ifp)->if_bpf, (m))

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

#if defined(__NetBSD__)
#include <net/if_ether.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/if_inarp.h>
#endif
#endif /* defined(__NetBSD__) */

#if defined(__OpenBSD__)
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>
#endif
#endif /* defined(__OpenBSD__) */


#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_axereg.h>

#ifdef AXE_DEBUG
#define DPRINTF(x)      do { if (axedebug) logprintf x; } while (0)
#define DPRINTFN(n,x)   do { if (axedebug >= (n)) logprintf x; } while (0)
int     axedebug = 0;
#else
#define DPRINTF(x)
#define DPRINTFN(n,x)
#endif

/*
 * Various supported device vendors/products.
 */
Static const struct axe_type axe_devs[] = {
        { { USB_VENDOR_ASIX,            USB_PRODUCT_ASIX_AX88172}, 0 },
        { { USB_VENDOR_COREGA,          USB_PRODUCT_COREGA_FETHER_USB2_TX }, 0},
        { { USB_VENDOR_DLINK,           USB_PRODUCT_DLINK_DUBE100}, 0 },
        { { USB_VENDOR_LINKSYS2,        USB_PRODUCT_LINKSYS2_USB200M}, 0 },
        { { USB_VENDOR_MELCO,           USB_PRODUCT_MELCO_LUAU2KTX}, 0 },
        { { USB_VENDOR_NETGEAR,         USB_PRODUCT_NETGEAR_FA120}, 0 },
        { { USB_VENDOR_SITECOM,         USB_PRODUCT_SITECOM_LN029}, 0 },
        { { USB_VENDOR_SYSTEMTALKS,     USB_PRODUCT_SYSTEMTALKS_SGCX2UL}, 0 },
};
#define axe_lookup(v, p) ((const struct axe_type *)usb_lookup(axe_devs, v, p))

int axe_match(device_t, cfdata_t, void *);
void axe_attach(device_t, device_t, void *);
int axe_detach(device_t, int);
int axe_activate(device_t, enum devact);
extern struct cfdriver axe_cd;
CFATTACH_DECL_NEW(axe, sizeof(struct axe_softc), axe_match, axe_attach,
    axe_detach, axe_activate);

Static int axe_tx_list_init(struct axe_softc *);
Static int axe_rx_list_init(struct axe_softc *);
Static int axe_newbuf(struct axe_softc *, struct axe_chain *, struct mbuf *);
Static int axe_encap(struct axe_softc *, struct mbuf *, int);
Static void axe_rxeof(usbd_xfer_handle, usbd_private_handle, usbd_status);
Static void axe_txeof(usbd_xfer_handle, usbd_private_handle, usbd_status);
Static void axe_tick(void *);
Static void axe_tick_task(void *);
#if 0
Static void axe_rxstart(struct ifnet *);
#endif
Static void axe_start(struct ifnet *);
Static int axe_ioctl(struct ifnet *, u_long, void *);
Static void axe_init(void *);
Static void axe_stop(struct axe_softc *);
Static void axe_watchdog(struct ifnet *);
Static int axe_miibus_readreg(device_t, int, int);
Static void axe_miibus_writereg(device_t, int, int, int);
Static void axe_miibus_statchg(device_t);
Static int axe_cmd(struct axe_softc *, int, int, int, void *);
Static void axe_reset(struct axe_softc *sc);

Static void axe_setmulti(struct axe_softc *);
Static void axe_lock_mii(struct axe_softc *sc);
Static void axe_unlock_mii(struct axe_softc *sc);

/* Get exclusive access to the MII registers */
Static void
axe_lock_mii(struct axe_softc *sc)
{
        sc->axe_refcnt++;
        mutex_enter(&sc->axe_mii_lock);
}

Static void
axe_unlock_mii(struct axe_softc *sc)
{
        mutex_exit(&sc->axe_mii_lock);
        if (--sc->axe_refcnt < 0)
                usb_detach_wakeup((sc->axe_dev));
}

Static int
axe_cmd(struct axe_softc *sc, int cmd, int index, int val, void *buf)
{
        usb_device_request_t    req;
        usbd_status             err;

        KASSERT(mutex_owned(&sc->axe_mii_lock));

        if (sc->axe_dying)
                return(0);

        if (AXE_CMD_DIR(cmd))
                req.bmRequestType = UT_WRITE_VENDOR_DEVICE;
        else
                req.bmRequestType = UT_READ_VENDOR_DEVICE;
        req.bRequest = AXE_CMD_CMD(cmd);
        USETW(req.wValue, val);
        USETW(req.wIndex, index);
        USETW(req.wLength, AXE_CMD_LEN(cmd));

        err = usbd_do_request(sc->axe_udev, &req, buf);

        if (err)
                return(-1);

        return(0);
}

Static int
axe_miibus_readreg(device_t dev, int phy, int reg)
{
        struct axe_softc *sc = device_private(dev);
        usbd_status             err;
        u_int16_t               val;

        if (sc->axe_dying) {
                DPRINTF(("axe: dying\n"));
                return(0);
        }

#ifdef notdef
        /*
         * The chip tells us the MII address of any supported
         * PHYs attached to the chip, so only read from those.
         */

        if (sc->axe_phyaddrs[0] != AXE_NOPHY && phy != sc->axe_phyaddrs[0])
                return (0);

        if (sc->axe_phyaddrs[1] != AXE_NOPHY && phy != sc->axe_phyaddrs[1])
                return (0);
#endif
        if (sc->axe_phyaddrs[0] != 0xFF && sc->axe_phyaddrs[0] != phy)
                return (0);

        val = 0;

        axe_lock_mii(sc);
        axe_cmd(sc, AXE_CMD_MII_OPMODE_SW, 0, 0, NULL);
        err = axe_cmd(sc, AXE_CMD_MII_READ_REG, reg, phy, (void *)&val);
        axe_cmd(sc, AXE_CMD_MII_OPMODE_HW, 0, 0, NULL);
        axe_unlock_mii(sc);

        if (err) {
                aprint_error_dev(sc->axe_dev, "read PHY failed\n");
                return(-1);
        }

        if (val)
                sc->axe_phyaddrs[0] = phy;

        return (le16toh(val));
}

Static void
axe_miibus_writereg(device_t dev, int phy, int reg, int aval)
{
        struct axe_softc *sc = device_private(dev);
        usbd_status             err;
        u_int16_t               val;

        if (sc->axe_dying)
                return;

        val = htole16(aval);
        axe_lock_mii(sc);
        axe_cmd(sc, AXE_CMD_MII_OPMODE_SW, 0, 0, NULL);
        err = axe_cmd(sc, AXE_CMD_MII_WRITE_REG, reg, phy, (void *)&val);
        axe_cmd(sc, AXE_CMD_MII_OPMODE_HW, 0, 0, NULL);
        axe_unlock_mii(sc);

        if (err) {
                aprint_error_dev(sc->axe_dev, "write PHY failed\n");
                return;
        }
}

Static void
axe_miibus_statchg(device_t dev)
{
        struct axe_softc *sc = device_private(dev);
        struct mii_data         *mii = GET_MII(sc);
        int val, err;

        if ((mii->mii_media_active & IFM_GMASK) == IFM_FDX)
                val = AXE_MEDIA_FULL_DUPLEX;
        else
                val = 0;
        DPRINTF(("axe_miibus_statchg: val=0x%x\n", val));
        axe_lock_mii(sc);
        err = axe_cmd(sc, AXE_CMD_WRITE_MEDIA, 0, val, NULL);
        axe_unlock_mii(sc);
        if (err) {
                aprint_error_dev(sc->axe_dev, "media change failed\n");
                return;
        }
}

Static void
axe_setmulti(struct axe_softc *sc)
{
        struct ifnet            *ifp;
        struct ether_multi *enm;
        struct ether_multistep step;
        u_int32_t               h = 0;
        u_int16_t               rxmode;
        u_int8_t                hashtbl[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };

        if (sc->axe_dying)
                return;

        ifp = GET_IFP(sc);

        axe_lock_mii(sc);
        axe_cmd(sc, AXE_CMD_RXCTL_READ, 0, 0, (void *)&rxmode);
        rxmode = le16toh(rxmode);

        if (ifp->if_flags & IFF_ALLMULTI || ifp->if_flags & IFF_PROMISC) {
        allmulti:
                rxmode |= AXE_RXCMD_ALLMULTI;
                axe_cmd(sc, AXE_CMD_RXCTL_WRITE, 0, rxmode, NULL);
                return;
        } else
                rxmode &= ~AXE_RXCMD_ALLMULTI;

        /* now program new ones */
#if defined(__NetBSD__)
        ETHER_FIRST_MULTI(step, &sc->axe_ec, enm);
#else
        ETHER_FIRST_MULTI(step, &sc->arpcom, enm);
#endif
        while (enm != NULL) {
                if (memcmp(enm->enm_addrlo, enm->enm_addrhi,
                           ETHER_ADDR_LEN) != 0)
                        goto allmulti;

                h = ether_crc32_be(enm->enm_addrlo, ETHER_ADDR_LEN) >> 26;
                hashtbl[h / 8] |= 1 << (h % 8);
                ETHER_NEXT_MULTI(step, enm);
        }

        ifp->if_flags &= ~IFF_ALLMULTI;
        axe_cmd(sc, AXE_CMD_WRITE_MCAST, 0, 0, (void *)&hashtbl);
        axe_cmd(sc, AXE_CMD_RXCTL_WRITE, 0, rxmode, NULL);
        axe_unlock_mii(sc);
        return;
}

Static void
axe_reset(struct axe_softc *sc)
{
        if (sc->axe_dying)
                return;
        /* XXX What to reset? */

        /* Wait a little while for the chip to get its brains in order. */
        DELAY(1000);
        return;
}

/*
 * Probe for a AX88172 chip.
 */
int
axe_match(device_t parent, cfdata_t match, void *aux)
{
        struct usb_attach_arg *uaa = aux;

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

/*
 * Attach the interface. Allocate softc structures, do ifmedia
 * setup and ethernet/BPF attach.
 */
void
axe_attach(device_t parent, device_t self, void *aux)
{
        struct axe_softc *sc = device_private(self);
        struct usb_attach_arg *uaa = aux;
        usbd_device_handle dev = uaa->device;
        usbd_status err;
        usb_interface_descriptor_t *id;
        usb_endpoint_descriptor_t *ed;
        struct mii_data *mii;
        u_char eaddr[ETHER_ADDR_LEN];
        char *devinfop;
        const char *devname = device_xname(self);
        struct ifnet *ifp;
        int i, s;

        sc->axe_dev = self;

        aprint_naive("\n");
        aprint_normal("\n");

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

        err = usbd_set_config_no(dev, AXE_CONFIG_NO, 1);
        if (err) {
                aprint_error_dev(self, "getting interface handle failed\n");
                return;
        }

        usb_init_task(&sc->axe_tick_task, axe_tick_task, sc);
        mutex_init(&sc->axe_mii_lock, MUTEX_DEFAULT, IPL_NONE);
        usb_init_task(&sc->axe_stop_task, (void (*)(void *))axe_stop, sc);

        err = usbd_device2interface_handle(dev, AXE_IFACE_IDX, &sc->axe_iface);
        if (err) {
                aprint_error_dev(self, "getting interface handle failed\n");
                return;
        }

        sc->axe_udev = dev;
        sc->axe_product = uaa->product;
        sc->axe_vendor = uaa->vendor;

        id = usbd_get_interface_descriptor(sc->axe_iface);

        /* Find endpoints. */
        for (i = 0; i < id->bNumEndpoints; i++) {
                ed = usbd_interface2endpoint_descriptor(sc->axe_iface, i);
                if (!ed) {
                        aprint_error_dev(self, "couldn't get ep %d\n", i);
                        return;
                }
                if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
                    UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
                        sc->axe_ed[AXE_ENDPT_RX] = ed->bEndpointAddress;
                } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_OUT &&
                           UE_GET_XFERTYPE(ed->bmAttributes) == UE_BULK) {
                        sc->axe_ed[AXE_ENDPT_TX] = ed->bEndpointAddress;
                } else if (UE_GET_DIR(ed->bEndpointAddress) == UE_DIR_IN &&
                           UE_GET_XFERTYPE(ed->bmAttributes) == UE_INTERRUPT) {
                        sc->axe_ed[AXE_ENDPT_INTR] = ed->bEndpointAddress;
                }
        }

        s = splnet();

        /*
         * Get station address.
         */
        axe_lock_mii(sc);
        axe_cmd(sc, AXE_CMD_READ_NODEID, 0, 0, &eaddr);

        /*
         * Load IPG values and PHY indexes.
         */
        axe_cmd(sc, AXE_CMD_READ_IPG012, 0, 0, (void *)&sc->axe_ipgs);
        axe_cmd(sc, AXE_CMD_READ_PHYID, 0, 0, (void *)&sc->axe_phyaddrs);
        axe_unlock_mii(sc);

        /*
         * Work around broken adapters that appear to lie about
         * their PHY addresses.
         */
        sc->axe_phyaddrs[0] = sc->axe_phyaddrs[1] = 0xFF;

        /*
         * An ASIX chip was detected. Inform the world.
         */
        aprint_normal_dev(self, "Ethernet address %s\n",
            ether_sprintf(eaddr));

        /* Initialize interface info.*/
        ifp = GET_IFP(sc);
        ifp->if_softc = sc;
        strncpy(ifp->if_xname, devname, IFNAMSIZ);
        ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
        ifp->if_ioctl = axe_ioctl;
        ifp->if_start = axe_start;

        ifp->if_watchdog = axe_watchdog;

/*      ifp->if_baudrate = 10000000; */
/*      ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;*/

        IFQ_SET_READY(&ifp->if_snd);

        /* Initialize MII/media info. */
        mii = &sc->axe_mii;
        mii->mii_ifp = ifp;
        mii->mii_readreg = axe_miibus_readreg;
        mii->mii_writereg = axe_miibus_writereg;
        mii->mii_statchg = axe_miibus_statchg;
        mii->mii_flags = MIIF_AUTOTSLEEP;

        sc->axe_ec.ec_mii = mii;
        ifmedia_init(&mii->mii_media, 0, ether_mediachange, ether_mediastatus);
        mii_attach(self, mii, 0xffffffff, MII_PHY_ANY, MII_OFFSET_ANY, 0);

        if (LIST_EMPTY(&mii->mii_phys)) {
                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, device_xname(sc->axe_dev),
            RND_TYPE_NET, 0);
#endif

        callout_init(&(sc->axe_stat_ch), 0);

        sc->axe_attached = 1;
        splx(s);

        usbd_add_drv_event(USB_EVENT_DRIVER_ATTACH, sc->axe_udev, sc->axe_dev);

        return;
}

int
axe_detach(device_t self, int flags)
{
        struct axe_softc *sc = device_private(self);
        int                     s;
        struct ifnet            *ifp = GET_IFP(sc);

        DPRINTFN(2,("%s: %s: enter\n", USBDEVNAME(sc->axe_dev), __func__));

        /* Detached before attached finished, so just bail out. */
        if (!sc->axe_attached)
                return (0);

        callout_stop(&(sc->axe_stat_ch));

        sc->axe_dying = 1;

        ether_ifdetach(ifp);

        if (sc->axe_ep[AXE_ENDPT_TX] != NULL)
                usbd_abort_pipe(sc->axe_ep[AXE_ENDPT_TX]);
        if (sc->axe_ep[AXE_ENDPT_RX] != NULL)
                usbd_abort_pipe(sc->axe_ep[AXE_ENDPT_RX]);
        if (sc->axe_ep[AXE_ENDPT_INTR] != NULL)
                usbd_abort_pipe(sc->axe_ep[AXE_ENDPT_INTR]);

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

        s = splusb();

        if (--sc->axe_refcnt >= 0) {
                /* Wait for processes to go away */
                usb_detach_wait((sc->axe_dev));
        }

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

#if defined(__NetBSD__)
#if NRND > 0
        rnd_detach_source(&sc->rnd_source);
#endif
#endif /* __NetBSD__ */
        mii_detach(&sc->axe_mii, MII_PHY_ANY, MII_OFFSET_ANY);
        ifmedia_delete_instance(&sc->axe_mii.mii_media, IFM_INST_ANY);
        ether_ifdetach(ifp);
        if_detach(ifp);

#ifdef DIAGNOSTIC
        if (sc->axe_ep[AXE_ENDPT_TX] != NULL ||
            sc->axe_ep[AXE_ENDPT_RX] != NULL ||
            sc->axe_ep[AXE_ENDPT_INTR] != NULL)
                aprint_debug_dev(self, "detach has active endpoints\n");
#endif

        sc->axe_attached = 0;

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

        usbd_add_drv_event(USB_EVENT_DRIVER_DETACH, sc->axe_udev, sc->axe_dev);

        return (0);
}

int
axe_activate(device_t self, enum devact act)
{
        struct axe_softc *sc = device_private(self);

        DPRINTFN(2,("%s: %s: enter\n", USBDEVNAME(sc->axe_dev), __func__));

        switch (act) {
        case DVACT_DEACTIVATE:
                if_deactivate(&sc->axe_ec.ec_if);
                sc->axe_dying = 1;
                return 0;
        default:
                return EOPNOTSUPP;
        }
}

/*
 * Initialize an RX descriptor and attach an MBUF cluster.
 */
Static int
axe_newbuf(struct axe_softc *sc, struct axe_chain *c, struct mbuf *m)
{
        struct mbuf             *m_new = NULL;

        DPRINTFN(10,("%s: %s: enter\n", USBDEVNAME(sc->axe_dev),__func__));

        if (m == NULL) {
                MGETHDR(m_new, M_DONTWAIT, MT_DATA);
                if (m_new == NULL) {
                        aprint_error_dev(sc->axe_dev, "no memory for rx list "
                            "-- packet dropped!\n");
                        return (ENOBUFS);
                }

                MCLGET(m_new, M_DONTWAIT);
                if (!(m_new->m_flags & M_EXT)) {
                        aprint_error_dev(sc->axe_dev, "no memory for rx list "
                            "-- packet dropped!\n");
                        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->axe_mbuf = m_new;

        return (0);
}

Static int
axe_rx_list_init(struct axe_softc *sc)
{
        struct axe_cdata *cd;
        struct axe_chain *c;
        int i;

        DPRINTF(("%s: %s: enter\n", USBDEVNAME(sc->axe_dev), __func__));

        cd = &sc->axe_cdata;
        for (i = 0; i < AXE_RX_LIST_CNT; i++) {
                c = &cd->axe_rx_chain[i];
                c->axe_sc = sc;
                c->axe_idx = i;
                if (axe_newbuf(sc, c, NULL) == ENOBUFS)
                        return (ENOBUFS);
                if (c->axe_xfer == NULL) {
                        c->axe_xfer = usbd_alloc_xfer(sc->axe_udev);
                        if (c->axe_xfer == NULL)
                                return (ENOBUFS);
                        c->axe_buf = usbd_alloc_buffer(c->axe_xfer, AXE_BUFSZ);
                        if (c->axe_buf == NULL) {
                                usbd_free_xfer(c->axe_xfer);
                                return (ENOBUFS);
                        }
                }
        }

        return (0);
}

Static int
axe_tx_list_init(struct axe_softc *sc)
{
        struct axe_cdata *cd;
        struct axe_chain *c;
        int i;

        DPRINTF(("%s: %s: enter\n", USBDEVNAME(sc->axe_dev), __func__));

        cd = &sc->axe_cdata;
        for (i = 0; i < AXE_TX_LIST_CNT; i++) {
                c = &cd->axe_tx_chain[i];
                c->axe_sc = sc;
                c->axe_idx = i;
                c->axe_mbuf = NULL;
                if (c->axe_xfer == NULL) {
                        c->axe_xfer = usbd_alloc_xfer(sc->axe_udev);
                        if (c->axe_xfer == NULL)
                                return (ENOBUFS);
                        c->axe_buf = usbd_alloc_buffer(c->axe_xfer, AXE_BUFSZ);
                        if (c->axe_buf == NULL) {
                                usbd_free_xfer(c->axe_xfer);
                                return (ENOBUFS);
                        }
                }
        }

        return (0);
}

#if 0
Static void
axe_rxstart(struct ifnet *ifp)
{
        struct axe_softc        *sc;
        struct axe_chain        *c;

        sc = ifp->if_softc;
        axe_lock_mii(sc);
        c = &sc->axe_cdata.axe_rx_chain[sc->axe_cdata.axe_rx_prod];

        if (axe_newbuf(sc, c, NULL) == ENOBUFS) {
                ifp->if_ierrors++;
                axe_unlock_mii(sc);
                return;
        }

        /* Setup new transfer. */
        usbd_setup_xfer(c->axe_xfer, sc->axe_ep[AXE_ENDPT_RX],
            c, mtod(c->axe_mbuf, char *), AXE_BUFSZ, USBD_SHORT_XFER_OK,
            USBD_NO_TIMEOUT, axe_rxeof);
        usbd_transfer(c->axe_xfer);
        axe_unlock_mii(sc);

        return;
}
#endif

/*
 * A frame has been uploaded: pass the resulting mbuf chain up to
 * the higher level protocols.
 */
Static void
axe_rxeof(usbd_xfer_handle xfer, usbd_private_handle priv, usbd_status status)
{
        struct axe_softc        *sc;
        struct axe_chain        *c;
        struct ifnet            *ifp;
        struct mbuf             *m;
        u_int32_t               total_len;
        int                     s;

        c = priv;
        sc = c->axe_sc;
        ifp = GET_IFP(sc);

        DPRINTFN(10,("%s: %s: enter\n", USBDEVNAME(sc->axe_dev),__func__));

        if (sc->axe_dying)
                return;

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

        if (status != USBD_NORMAL_COMPLETION) {
                if (status == USBD_NOT_STARTED || status == USBD_CANCELLED)
                        return;
                if (usbd_ratecheck(&sc->axe_rx_notice)) {
                        printf("%s: usb errors on rx: %s\n",
                            device_xname(sc->axe_dev), usbd_errstr(status));
                }
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(sc->axe_ep[AXE_ENDPT_RX]);
                goto done;
        }

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

        m = c->axe_mbuf;

        if (total_len <= sizeof(struct ether_header)) {
                ifp->if_ierrors++;
                goto done;
        }

        ifp->if_ipackets++;
        m->m_pkthdr.rcvif = ifp;
        m->m_pkthdr.len = m->m_len = total_len;


        memcpy(mtod(c->axe_mbuf, char *), c->axe_buf, total_len);

        /* No errors; receive the packet. */
        total_len -= ETHER_CRC_LEN + 4;

        s = splnet();

        /* XXX ugly */
        if (axe_newbuf(sc, c, NULL) == ENOBUFS) {
                ifp->if_ierrors++;
                goto done1;
        }

#if NBPFILTER > 0
        if (ifp->if_bpf)
                BPF_MTAP(ifp, m);
#endif

        DPRINTFN(10,("%s: %s: deliver %d\n", USBDEVNAME(sc->axe_dev),
                    __func__, m->m_len));
        (*(ifp)->if_input)((ifp), (m));
 done1:
        splx(s);

 done:

        /* Setup new transfer. */
        usbd_setup_xfer(xfer, sc->axe_ep[AXE_ENDPT_RX],
            c, c->axe_buf, AXE_BUFSZ,
            USBD_SHORT_XFER_OK | USBD_NO_COPY,
            USBD_NO_TIMEOUT, axe_rxeof);
        usbd_transfer(xfer);

        DPRINTFN(10,("%s: %s: start rx\n", USBDEVNAME(sc->axe_dev),
                    __func__));
        return;
}

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

Static void
axe_txeof(usbd_xfer_handle xfer, usbd_private_handle priv,
    usbd_status status)
{
        struct axe_softc        *sc;
        struct axe_chain        *c;
        struct ifnet            *ifp;
        int                     s;

        c = priv;
        sc = c->axe_sc;
        ifp = GET_IFP(sc);

        if (sc->axe_dying)
                return;

        s = splnet();

        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", device_xname(sc->axe_dev),
                    usbd_errstr(status));
                if (status == USBD_STALLED)
                        usbd_clear_endpoint_stall_async(sc->axe_ep[AXE_ENDPT_TX]);
                splx(s);
                return;
        }

        ifp->if_timer = 0;
        ifp->if_flags &= ~IFF_OACTIVE;

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

        if (IFQ_IS_EMPTY(&ifp->if_snd) == 0)
                axe_start(ifp);

        ifp->if_opackets++;
        splx(s);
        return;
}

Static void
axe_tick(void *xsc)
{
        struct axe_softc *sc = xsc;

        if (sc == NULL)
                return;

        DPRINTFN(0xff, ("%s: %s: enter\n", USBDEVNAME(sc->axe_dev),
                        __func__));

        if (sc->axe_dying)
                return;

        /* Perform periodic stuff in process context */
        usb_add_task(sc->axe_udev, &sc->axe_tick_task, USB_TASKQ_DRIVER);

}

Static void
axe_tick_task(void *xsc)
{
        int                     s;
        struct axe_softc        *sc;
        struct ifnet            *ifp;
        struct mii_data         *mii;

        sc = xsc;

        if (sc == NULL)
                return;

        if (sc->axe_dying)
                return;

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

        s = splnet();

        mii_tick(mii);

        callout_reset(&(sc->axe_stat_ch), (hz), (axe_tick), (sc));

        splx(s);
}

Static int
axe_encap(struct axe_softc *sc, struct mbuf *m, int idx)
{
        struct axe_chain        *c;
        usbd_status             err;

        c = &sc->axe_cdata.axe_tx_chain[idx];

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

        usbd_setup_xfer(c->axe_xfer, sc->axe_ep[AXE_ENDPT_TX],
            c, c->axe_buf, m->m_pkthdr.len, USBD_FORCE_SHORT_XFER, 10000,
            axe_txeof);

        /* Transmit */
        err = usbd_transfer(c->axe_xfer);
        if (err != USBD_IN_PROGRESS) {
                axe_stop(sc);
                return(EIO);
        }

        sc->axe_cdata.axe_tx_cnt++;

        return(0);
}

Static void
axe_start(struct ifnet *ifp)
{
        struct axe_softc        *sc;
        struct mbuf             *m_head = NULL;

        sc = ifp->if_softc;

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

        IF_DEQUEUE(&ifp->if_snd, m_head);
        if (m_head == NULL) {
                return;
        }

        if (axe_encap(sc, m_head, 0)) {
                IF_PREPEND(&ifp->if_snd, m_head);
                ifp->if_flags |= IFF_OACTIVE;
                return;
        }

        /*
         * If there's a BPF listener, bounce a copy of this frame
         * to him.
         */
#if NBPFILTER > 0
         if (ifp->if_bpf)
                BPF_MTAP(ifp, m_head);
#endif

        ifp->if_flags |= IFF_OACTIVE;

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

        return;
}

Static void
axe_init(void *xsc)
{
        struct axe_softc        *sc = xsc;
        struct ifnet            *ifp = GET_IFP(sc);
        struct axe_chain        *c;
        usbd_status             err;
        int                     rxmode;
        int                     i, s;

        if (ifp->if_flags & IFF_RUNNING)
                return;

        s = splnet();

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

        /* Enable RX logic. */

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

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

        /* Set transmitter IPG values */
        axe_lock_mii(sc);
        axe_cmd(sc, AXE_CMD_WRITE_IPG0, 0, sc->axe_ipgs[0], NULL);
        axe_cmd(sc, AXE_CMD_WRITE_IPG1, 0, sc->axe_ipgs[1], NULL);
        axe_cmd(sc, AXE_CMD_WRITE_IPG2, 0, sc->axe_ipgs[2], NULL);

        /* Enable receiver, set RX mode */
        rxmode = AXE_RXCMD_UNICAST|AXE_RXCMD_MULTICAST|AXE_RXCMD_ENABLE;

        /* If we want promiscuous mode, set the allframes bit. */
        if (ifp->if_flags & IFF_PROMISC)
                rxmode |= AXE_RXCMD_PROMISC;

        if (ifp->if_flags & IFF_BROADCAST)
                rxmode |= AXE_RXCMD_BROADCAST;

        axe_cmd(sc, AXE_CMD_RXCTL_WRITE, 0, rxmode, NULL);
        axe_unlock_mii(sc);

        /* Load the multicast filter. */
        axe_setmulti(sc);

        /* Open RX and TX pipes. */
        err = usbd_open_pipe(sc->axe_iface, sc->axe_ed[AXE_ENDPT_RX],
            USBD_EXCLUSIVE_USE, &sc->axe_ep[AXE_ENDPT_RX]);
        if (err) {
                printf("%s: open rx pipe failed: %s\n",
                    device_xname(sc->axe_dev), usbd_errstr(err));
                splx(s);
                return;
        }

        err = usbd_open_pipe(sc->axe_iface, sc->axe_ed[AXE_ENDPT_TX],
            USBD_EXCLUSIVE_USE, &sc->axe_ep[AXE_ENDPT_TX]);
        if (err) {
                printf("%s: open tx pipe failed: %s\n",
                    device_xname(sc->axe_dev), usbd_errstr(err));
                splx(s);
                return;
        }

        /* Start up the receive pipe. */
        for (i = 0; i < AXE_RX_LIST_CNT; i++) {
                c = &sc->axe_cdata.axe_rx_chain[i];
                usbd_setup_xfer(c->axe_xfer, sc->axe_ep[AXE_ENDPT_RX],
                    c, mtod(c->axe_mbuf, char *), AXE_BUFSZ,
                    USBD_SHORT_XFER_OK, USBD_NO_TIMEOUT, axe_rxeof);
                usbd_transfer(c->axe_xfer);
        }

        ifp->if_flags |= IFF_RUNNING;
        ifp->if_flags &= ~IFF_OACTIVE;

        splx(s);

        callout_init(&(sc->axe_stat_ch), 0);
        callout_reset(&(sc->axe_stat_ch), (hz), (axe_tick), (sc));
        return;
}

Static int
axe_ioctl(struct ifnet *ifp, u_long cmd, void *data)
{
        struct axe_softc        *sc = ifp->if_softc;
        struct ifreq            *ifr = (struct ifreq *)data;
        struct ifaddr           *ifa = (struct ifaddr *)data;
        u_int16_t               rxmode;
        int                     error = 0;

        switch(cmd) {
        case SIOCINITIFADDR:
                ifp->if_flags |= IFF_UP;
                axe_init(sc);

                switch (ifa->ifa_addr->sa_family) {
#ifdef INET
                case AF_INET:
#if defined(__NetBSD__)
                        arp_ifinit(ifp, ifa);
#else
                        arp_ifinit(&sc->arpcom, ifa);
#endif
                        break;
#endif /* INET */
                }
                break;

        case SIOCSIFMTU:
                if (ifr->ifr_mtu < ETHERMIN || ifr->ifr_mtu > ETHERMTU)
                        error = EINVAL;
                else if ((error = ifioctl_common(ifp, cmd, data)) == ENETRESET)
                        error = 0;
                break;

        case SIOCSIFFLAGS:
                if ((error = ifioctl_common(ifp, cmd, data)) != 0)
                        break;
                if (ifp->if_flags & IFF_UP) {
                        if (ifp->if_flags & IFF_RUNNING &&
                            ifp->if_flags & IFF_PROMISC &&
                            !(sc->axe_if_flags & IFF_PROMISC)) {

                                axe_lock_mii(sc);
                                axe_cmd(sc, AXE_CMD_RXCTL_READ,
                                        0, 0, (void *)&rxmode);
                                rxmode = le16toh(rxmode) | AXE_RXCMD_PROMISC;
                                axe_cmd(sc, AXE_CMD_RXCTL_WRITE,
                                        0, rxmode, NULL);
                                axe_unlock_mii(sc);

                                axe_setmulti(sc);
                        } else if (ifp->if_flags & IFF_RUNNING &&
                            !(ifp->if_flags & IFF_PROMISC) &&
                            sc->axe_if_flags & IFF_PROMISC) {
                                axe_lock_mii(sc);
                                axe_cmd(sc, AXE_CMD_RXCTL_READ,
                                        0, 0, (void *)&rxmode);
                                rxmode = le16toh(rxmode) & ~AXE_RXCMD_PROMISC;
                                axe_cmd(sc, AXE_CMD_RXCTL_WRITE,
                                        0, rxmode, NULL);
                                axe_unlock_mii(sc);
                                axe_setmulti(sc);
                        } else if (!(ifp->if_flags & IFF_RUNNING))
                                axe_init(sc);
                } else {
                        if (ifp->if_flags & IFF_RUNNING)
                                axe_stop(sc);
                }
                sc->axe_if_flags = ifp->if_flags;
                error = 0;
                break;
        case SIOCADDMULTI:
        case SIOCDELMULTI:
        case SIOCGIFMEDIA:
        case SIOCSIFMEDIA:
                error = ether_ioctl(ifp, cmd, data);
                if (error == ENETRESET) {
                        /*
                         * Multicast list has changed; set the hardware
                         * filter accordingly.
                         */
                        if (ifp->if_flags & IFF_RUNNING)
                                axe_setmulti(sc);
                        error = 0;
                }
                break;
        default:
                error = ether_ioctl(ifp, cmd, data);
                break;
        }

        return(error);
}

/*
 * XXX
 * You can't call axe_txeof since the USB transfer has not
 * completed yet.
 */
Static void
axe_watchdog(struct ifnet *ifp)
{
        struct axe_softc        *sc;
        struct axe_chain        *c;
        usbd_status             stat;
        int                     s;

        sc = ifp->if_softc;

        ifp->if_oerrors++;
        printf("%s: watchdog timeout\n", device_xname(sc->axe_dev));

        s = splusb();
        c = &sc->axe_cdata.axe_tx_chain[0];
        usbd_get_xfer_status(c->axe_xfer, NULL, NULL, NULL, &stat);
        axe_txeof(c->axe_xfer, c, stat);

        if (ifp->if_snd.ifq_head != NULL)
                axe_start(ifp);
        splx(s);
}

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

        axe_reset(sc);

        ifp = GET_IFP(sc);
        ifp->if_timer = 0;

        callout_stop(&(sc->axe_stat_ch));

        /* Stop transfers. */
        if (sc->axe_ep[AXE_ENDPT_RX] != NULL) {
                err = usbd_abort_pipe(sc->axe_ep[AXE_ENDPT_RX]);
                if (err) {
                        printf("%s: abort rx pipe failed: %s\n",
                            device_xname(sc->axe_dev), usbd_errstr(err));
                }
                err = usbd_close_pipe(sc->axe_ep[AXE_ENDPT_RX]);
                if (err) {
                        printf("%s: close rx pipe failed: %s\n",
                            device_xname(sc->axe_dev), usbd_errstr(err));
                }
                sc->axe_ep[AXE_ENDPT_RX] = NULL;
        }

        if (sc->axe_ep[AXE_ENDPT_TX] != NULL) {
                err = usbd_abort_pipe(sc->axe_ep[AXE_ENDPT_TX]);
                if (err) {
                        printf("%s: abort tx pipe failed: %s\n",
                            device_xname(sc->axe_dev), usbd_errstr(err));
                }
                err = usbd_close_pipe(sc->axe_ep[AXE_ENDPT_TX]);
                if (err) {
                        printf("%s: close tx pipe failed: %s\n",
                            device_xname(sc->axe_dev), usbd_errstr(err));
                }
                sc->axe_ep[AXE_ENDPT_TX] = NULL;
        }

        if (sc->axe_ep[AXE_ENDPT_INTR] != NULL) {
                err = usbd_abort_pipe(sc->axe_ep[AXE_ENDPT_INTR]);
                if (err) {
                        printf("%s: abort intr pipe failed: %s\n",
                            device_xname(sc->axe_dev), usbd_errstr(err));
                }
                err = usbd_close_pipe(sc->axe_ep[AXE_ENDPT_INTR]);
                if (err) {
                        printf("%s: close intr pipe failed: %s\n",
                            device_xname(sc->axe_dev), usbd_errstr(err));
                }
                sc->axe_ep[AXE_ENDPT_INTR] = NULL;
        }

        /* Free RX resources. */
        for (i = 0; i < AXE_RX_LIST_CNT; i++) {
                if (sc->axe_cdata.axe_rx_chain[i].axe_mbuf != NULL) {
                        m_freem(sc->axe_cdata.axe_rx_chain[i].axe_mbuf);
                        sc->axe_cdata.axe_rx_chain[i].axe_mbuf = NULL;
                }
                if (sc->axe_cdata.axe_rx_chain[i].axe_xfer != NULL) {
                        usbd_free_xfer(sc->axe_cdata.axe_rx_chain[i].axe_xfer);
                        sc->axe_cdata.axe_rx_chain[i].axe_xfer = NULL;
                }
        }

        /* Free TX resources. */
        for (i = 0; i < AXE_TX_LIST_CNT; i++) {
                if (sc->axe_cdata.axe_tx_chain[i].axe_mbuf != NULL) {
                        m_freem(sc->axe_cdata.axe_tx_chain[i].axe_mbuf);
                        sc->axe_cdata.axe_tx_chain[i].axe_mbuf = NULL;
                }
                if (sc->axe_cdata.axe_tx_chain[i].axe_xfer != NULL) {
                        usbd_free_xfer(sc->axe_cdata.axe_tx_chain[i].axe_xfer);
                        sc->axe_cdata.axe_tx_chain[i].axe_xfer = NULL;
                }
        }

        ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE);
}