456 lines
9.0 KiB
C
456 lines
9.0 KiB
C
/*-
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* Copyright (c) 1998 Nicolas Souchu
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* I2C bus IP driver
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*/
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#ifdef _KERNEL
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/filio.h>
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#include <sys/sockio.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/time.h>
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#include <sys/malloc.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/netisr.h>
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#endif
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <net/netisr.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/if_ether.h>
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#include <net/bpf.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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#include "iicbus_if.h"
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#define ICHDRLEN sizeof(u_int)
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#define ICMTU 1500 /* default mtu */
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struct ic_softc {
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struct ifnet ic_if;
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u_char ic_addr; /* peer I2C address */
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int ic_sending;
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char *ic_obuf;
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char *ic_ifbuf;
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char *ic_cp;
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int ic_xfercnt;
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int ic_iferrs;
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};
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static devclass_t ic_devclass;
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static int icprobe(device_t);
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static int icattach(device_t);
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static int icioctl(struct ifnet *, u_long, caddr_t);
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static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
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struct rtentry *);
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static void icintr(device_t, int, char *);
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static device_method_t ic_methods[] = {
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/* device interface */
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DEVMETHOD(device_probe, icprobe),
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DEVMETHOD(device_attach, icattach),
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/* iicbus interface */
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DEVMETHOD(iicbus_intr, icintr),
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{ 0, 0 }
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};
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static driver_t ic_driver = {
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"ic",
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ic_methods,
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sizeof(struct ic_softc),
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};
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/*
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* icprobe()
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*/
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static int
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icprobe(device_t dev)
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{
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return (0);
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}
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/*
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* icattach()
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*/
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static int
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icattach(device_t dev)
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{
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struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
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struct ifnet *ifp = &sc->ic_if;
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sc->ic_addr = iicbus_get_addr(dev);
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ifp->if_softc = sc;
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ifp->if_name = "ic";
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ifp->if_unit = device_get_unit(dev);
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ifp->if_mtu = ICMTU;
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ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
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ifp->if_ioctl = icioctl;
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ifp->if_output = icoutput;
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ifp->if_type = IFT_PARA;
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ifp->if_hdrlen = 0;
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ifp->if_addrlen = 0;
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ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
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if_attach(ifp);
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bpfattach(ifp, DLT_NULL, ICHDRLEN);
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return (0);
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}
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/*
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* iciotcl()
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*/
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static int
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icioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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device_t icdev = devclass_get_device(ic_devclass, ifp->if_unit);
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device_t parent = device_get_parent(icdev);
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struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
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struct ifaddr *ifa = (struct ifaddr *)data;
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struct ifreq *ifr = (struct ifreq *)data;
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u_char *iptr, *optr;
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int error;
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switch (cmd) {
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case SIOCSIFDSTADDR:
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case SIOCAIFADDR:
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case SIOCSIFADDR:
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if (ifa->ifa_addr->sa_family != AF_INET)
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return EAFNOSUPPORT;
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ifp->if_flags |= IFF_UP;
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/* FALLTHROUGH */
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case SIOCSIFFLAGS:
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if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
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/* XXX disable PCF */
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ifp->if_flags &= ~IFF_RUNNING;
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/* IFF_UP is not set, try to release the bus anyway */
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iicbus_release_bus(parent, icdev);
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break;
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}
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if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
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if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR)))
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return (error);
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sc->ic_obuf = malloc(sc->ic_if.if_mtu + ICHDRLEN,
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M_DEVBUF, M_WAITOK);
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if (!sc->ic_obuf) {
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iicbus_release_bus(parent, icdev);
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return ENOBUFS;
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}
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sc->ic_ifbuf = malloc(sc->ic_if.if_mtu + ICHDRLEN,
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M_DEVBUF, M_WAITOK);
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if (!sc->ic_ifbuf) {
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iicbus_release_bus(parent, icdev);
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return ENOBUFS;
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}
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iicbus_reset(parent, IIC_FASTEST, 0, NULL);
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ifp->if_flags |= IFF_RUNNING;
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}
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break;
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case SIOCSIFMTU:
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/* save previous buffers */
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iptr = sc->ic_ifbuf;
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optr = sc->ic_obuf;
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/* allocate input buffer */
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sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT);
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if (!sc->ic_ifbuf) {
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sc->ic_ifbuf = iptr;
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sc->ic_obuf = optr;
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return ENOBUFS;
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}
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/* allocate output buffer */
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sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT);
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if (!sc->ic_obuf) {
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free(sc->ic_ifbuf,M_DEVBUF);
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sc->ic_ifbuf = iptr;
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sc->ic_obuf = optr;
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return ENOBUFS;
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}
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if (iptr)
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free(iptr,M_DEVBUF);
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if (optr)
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free(optr,M_DEVBUF);
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sc->ic_if.if_mtu = ifr->ifr_mtu;
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break;
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case SIOCGIFMTU:
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ifr->ifr_mtu = sc->ic_if.if_mtu;
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break;
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case SIOCADDMULTI:
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case SIOCDELMULTI:
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if (ifr == 0) {
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return EAFNOSUPPORT; /* XXX */
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}
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switch (ifr->ifr_addr.sa_family) {
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case AF_INET:
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break;
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default:
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return EAFNOSUPPORT;
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}
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break;
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default:
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return EINVAL;
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}
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return 0;
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}
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/*
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* icintr()
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*/
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static void
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icintr (device_t dev, int event, char *ptr)
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{
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struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
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int unit = device_get_unit(dev);
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int s, len;
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struct mbuf *top;
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s = splhigh();
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switch (event) {
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case INTR_GENERAL:
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case INTR_START:
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sc->ic_cp = sc->ic_ifbuf;
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sc->ic_xfercnt = 0;
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break;
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case INTR_STOP:
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/* if any error occured during transfert,
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* drop the packet */
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if (sc->ic_iferrs)
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goto err;
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if ((len = sc->ic_xfercnt) == 0)
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break; /* ignore */
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if (len <= ICHDRLEN)
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goto err;
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if (IF_QFULL(&ipintrq)) {
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IF_DROP(&ipintrq);
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break;
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}
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len -= ICHDRLEN;
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sc->ic_if.if_ipackets ++;
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sc->ic_if.if_ibytes += len;
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if (sc->ic_if.if_bpf)
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bpf_tap(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN);
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top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0);
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if (top) {
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IF_ENQUEUE(&ipintrq, top);
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schednetisr(NETISR_IP);
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}
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break;
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err:
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printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs);
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sc->ic_iferrs = 0; /* reset error count */
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sc->ic_if.if_ierrors ++;
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break;
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case INTR_RECEIVE:
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if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) {
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sc->ic_iferrs ++;
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} else {
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*sc->ic_cp++ = *ptr;
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sc->ic_xfercnt ++;
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}
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break;
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case INTR_NOACK: /* xfer terminated by master */
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break;
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case INTR_TRANSMIT:
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*ptr = 0xff; /* XXX */
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break;
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case INTR_ERROR:
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sc->ic_iferrs ++;
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break;
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default:
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panic("%s: unknown event (%d)!", __FUNCTION__, event);
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}
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splx(s);
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return;
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}
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/*
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* icoutput()
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*/
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static int
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icoutput(struct ifnet *ifp, struct mbuf *m,
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struct sockaddr *dst, struct rtentry *rt)
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{
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device_t icdev = devclass_get_device(ic_devclass, ifp->if_unit);
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device_t parent = device_get_parent(icdev);
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struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
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int s, len, sent;
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struct mbuf *mm;
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u_char *cp;
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u_int hdr = dst->sa_family;
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ifp->if_flags |= IFF_RUNNING;
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s = splhigh();
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/* already sending? */
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if (sc->ic_sending) {
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ifp->if_oerrors ++;
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goto error;
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}
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/* insert header */
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bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN);
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cp = sc->ic_obuf + ICHDRLEN;
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len = 0;
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mm = m;
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do {
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if (len + mm->m_len > sc->ic_if.if_mtu) {
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/* packet to large */
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ifp->if_oerrors ++;
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goto error;
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}
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bcopy(mtod(mm,char *), cp, mm->m_len);
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cp += mm->m_len;
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len += mm->m_len;
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} while ((mm = mm->m_next));
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if (ifp->if_bpf) {
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struct mbuf m0, *n = m;
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/*
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* We need to prepend the address family as
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* a four byte field. Cons up a dummy header
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* to pacify bpf. This is safe because bpf
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* will only read from the mbuf (i.e., it won't
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* try to free it or keep a pointer a to it).
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*/
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m0.m_next = m;
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m0.m_len = sizeof(u_int);
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m0.m_data = (char *)&hdr;
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n = &m0;
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bpf_mtap(ifp, n);
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}
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sc->ic_sending = 1;
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m_freem(m);
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splx(s);
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/* send the packet */
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if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf,
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len + ICHDRLEN, &sent))
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ifp->if_oerrors ++;
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else {
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ifp->if_opackets ++;
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ifp->if_obytes += len;
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}
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sc->ic_sending = 0;
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return (0);
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error:
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m_freem(m);
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splx(s);
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return(0);
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}
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DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0);
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