435 lines
9.4 KiB
C
435 lines
9.4 KiB
C
/*-
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* Copyright (c) 1998, 2001 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* I2C bus IP driver
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*/
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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/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.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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#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 PCF_MASTER_ADDRESS 0xaa
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#define ICHDRLEN sizeof(u_int32_t)
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#define ICMTU 1500 /* default mtu */
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struct ic_softc {
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struct ifnet *ic_ifp;
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device_t ic_dev;
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u_char ic_addr; /* peer I2C address */
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int ic_flags;
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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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struct mtx ic_lock;
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};
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#define IC_SENDING 0x0001
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#define IC_OBUF_BUSY 0x0002
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#define IC_IFBUF_BUSY 0x0004
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#define IC_BUFFERS_BUSY (IC_OBUF_BUSY | IC_IFBUF_BUSY)
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#define IC_BUFFER_WAITER 0x0004
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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 *, const struct sockaddr *,
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struct route *);
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static int 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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static void
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ic_alloc_buffers(struct ic_softc *sc, int mtu)
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{
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char *obuf, *ifbuf;
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obuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK);
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ifbuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK);
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mtx_lock(&sc->ic_lock);
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while (sc->ic_flags & IC_BUFFERS_BUSY) {
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sc->ic_flags |= IC_BUFFER_WAITER;
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mtx_sleep(sc, &sc->ic_lock, 0, "icalloc", 0);
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sc->ic_flags &= ~IC_BUFFER_WAITER;
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}
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free(sc->ic_obuf, M_DEVBUF);
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free(sc->ic_ifbuf, M_DEVBUF);
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sc->ic_obuf = obuf;
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sc->ic_ifbuf = ifbuf;
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sc->ic_ifp->if_mtu = mtu;
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mtx_unlock(&sc->ic_lock);
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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 (BUS_PROBE_NOWILDCARD);
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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;
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ifp = sc->ic_ifp = if_alloc(IFT_PARA);
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if (ifp == NULL)
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return (ENOSPC);
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mtx_init(&sc->ic_lock, device_get_nameunit(dev), MTX_NETWORK_LOCK,
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MTX_DEF);
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sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */
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sc->ic_dev = dev;
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ifp->if_softc = sc;
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if_initname(ifp, device_get_name(dev), device_get_unit(dev));
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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_hdrlen = 0;
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ifp->if_addrlen = 0;
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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ic_alloc_buffers(sc, ICMTU);
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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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struct ic_softc *sc = ifp->if_softc;
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device_t icdev = sc->ic_dev;
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device_t parent = device_get_parent(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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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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mtx_lock(&sc->ic_lock);
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ifp->if_flags |= IFF_UP;
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goto locked;
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case SIOCSIFFLAGS:
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mtx_lock(&sc->ic_lock);
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locked:
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if ((!(ifp->if_flags & IFF_UP)) &&
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(ifp->if_drv_flags & IFF_DRV_RUNNING)) {
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/* XXX disable PCF */
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ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
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mtx_unlock(&sc->ic_lock);
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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)) &&
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(!(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
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mtx_unlock(&sc->ic_lock);
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if ((error = iicbus_request_bus(parent, icdev,
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IIC_WAIT | IIC_INTR)))
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return (error);
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mtx_lock(&sc->ic_lock);
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iicbus_reset(parent, IIC_FASTEST, 0, NULL);
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ifp->if_drv_flags |= IFF_DRV_RUNNING;
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}
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mtx_unlock(&sc->ic_lock);
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break;
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case SIOCSIFMTU:
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ic_alloc_buffers(sc, ifr->ifr_mtu);
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break;
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case SIOCGIFMTU:
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mtx_lock(&sc->ic_lock);
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ifr->ifr_mtu = sc->ic_ifp->if_mtu;
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mtx_unlock(&sc->ic_lock);
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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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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 int
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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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struct mbuf *top;
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int len;
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mtx_lock(&sc->ic_lock);
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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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sc->ic_flags |= IC_IFBUF_BUSY;
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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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sc->ic_flags &= ~IC_IFBUF_BUSY;
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if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) ==
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IC_BUFFER_WAITER)
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wakeup(&sc);
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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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len -= ICHDRLEN;
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sc->ic_ifp->if_ipackets++;
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sc->ic_ifp->if_ibytes += len;
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BPF_TAP(sc->ic_ifp, sc->ic_ifbuf, len + ICHDRLEN);
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top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, sc->ic_ifp, 0);
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if (top) {
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mtx_unlock(&sc->ic_lock);
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M_SETFIB(top, sc->ic_ifp->if_fib);
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netisr_dispatch(NETISR_IP, top);
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mtx_lock(&sc->ic_lock);
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}
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break;
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err:
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if_printf(sc->ic_ifp, "errors (%d)!\n", sc->ic_iferrs);
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sc->ic_iferrs = 0; /* reset error count */
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sc->ic_ifp->if_ierrors++;
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break;
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case INTR_RECEIVE:
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if (sc->ic_xfercnt >= sc->ic_ifp->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)!", __func__, event);
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}
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mtx_unlock(&sc->ic_lock);
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return (0);
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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, const struct sockaddr *dst,
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struct route *ro)
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{
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struct ic_softc *sc = ifp->if_softc;
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device_t icdev = sc->ic_dev;
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device_t parent = device_get_parent(icdev);
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int len, sent;
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struct mbuf *mm;
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u_char *cp;
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u_int32_t hdr;
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/* BPF writes need to be handled specially. */
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if (dst->sa_family == AF_UNSPEC)
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bcopy(dst->sa_data, &hdr, sizeof(hdr));
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else
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hdr = dst->sa_family;
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mtx_lock(&sc->ic_lock);
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ifp->if_drv_flags |= IFF_DRV_RUNNING;
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/* already sending? */
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if (sc->ic_flags & 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_ifp->if_mtu) {
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/* packet too 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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BPF_MTAP2(ifp, &hdr, sizeof(hdr), m);
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sc->ic_flags |= (IC_SENDING | IC_OBUF_BUSY);
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m_freem(m);
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mtx_unlock(&sc->ic_lock);
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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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mtx_lock(&sc->ic_lock);
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sc->ic_flags &= ~(IC_SENDING | IC_OBUF_BUSY);
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if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) ==
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IC_BUFFER_WAITER)
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wakeup(&sc);
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mtx_unlock(&sc->ic_lock);
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return (0);
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error:
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m_freem(m);
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mtx_unlock(&sc->ic_lock);
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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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MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
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MODULE_VERSION(ic, 1);
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