freebsd-skq/sys/dev/iicbus/if_ic.c

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/*-
* Copyright (c) 1998 Nicolas Souchu
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: if_ic.c,v 1.2 1998/10/31 11:31:07 nsouch Exp $
*/
/*
* I2C bus IP driver
*/
#ifdef KERNEL
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/filio.h>
#include <sys/sockio.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/time.h>
#include <sys/malloc.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/netisr.h>
#endif /* KERNEL */
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <net/netisr.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/if_ether.h>
#include "bpfilter.h"
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <dev/iicbus/iiconf.h>
#include <dev/iicbus/iicbus.h>
#include "iicbus_if.h"
#define ICHDRLEN sizeof(u_int)
#define ICMTU 1500 /* default mtu */
struct ic_softc {
struct ifnet ic_if;
u_char ic_addr; /* peer I2C address */
int ic_sending;
char *ic_obuf;
char *ic_ifbuf;
char *ic_cp;
int ic_xfercnt;
int ic_iferrs;
};
static devclass_t ic_devclass;
static int icprobe(device_t);
static int icattach(device_t);
static int icioctl(struct ifnet *, u_long, caddr_t);
static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
static void icintr(device_t, int, char *);
static device_method_t ic_methods[] = {
/* device interface */
DEVMETHOD(device_probe, icprobe),
DEVMETHOD(device_attach, icattach),
/* iicbus interface */
DEVMETHOD(iicbus_intr, icintr),
{ 0, 0 }
};
static driver_t ic_driver = {
"ic",
ic_methods,
DRIVER_TYPE_MISC,
sizeof(struct ic_softc),
};
/*
* icprobe()
*/
static int
icprobe(device_t dev)
{
return (0);
}
/*
* icattach()
*/
static int
icattach(device_t dev)
{
struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
struct ifnet *ifp = &sc->ic_if;
sc->ic_addr = iicbus_get_addr(dev);
ifp->if_softc = sc;
ifp->if_name = "ic";
ifp->if_unit = device_get_unit(dev);
ifp->if_mtu = ICMTU;
ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
ifp->if_ioctl = icioctl;
ifp->if_output = icoutput;
ifp->if_type = IFT_PARA;
ifp->if_hdrlen = 0;
ifp->if_addrlen = 0;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
if_attach(ifp);
#if NBPFILTER > 0
bpfattach(ifp, DLT_NULL, ICHDRLEN);
#endif
return (0);
}
/*
* iciotcl()
*/
static int
icioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
device_t icdev = devclass_get_device(ic_devclass, ifp->if_unit);
device_t parent = device_get_parent(icdev);
struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
struct ifaddr *ifa = (struct ifaddr *)data;
struct ifreq *ifr = (struct ifreq *)data;
u_char *iptr, *optr;
int error;
switch (cmd) {
case SIOCSIFDSTADDR:
case SIOCAIFADDR:
case SIOCSIFADDR:
if (ifa->ifa_addr->sa_family != AF_INET)
return EAFNOSUPPORT;
ifp->if_flags |= IFF_UP;
/* FALLTHROUGH */
case SIOCSIFFLAGS:
if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
/* XXX disable PCF */
ifp->if_flags &= ~IFF_RUNNING;
/* IFF_UP is not set, try to release the bus anyway */
iicbus_release_bus(parent, icdev);
break;
}
if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR)))
return (error);
sc->ic_obuf = malloc(sc->ic_if.if_mtu + ICHDRLEN,
M_DEVBUF, M_WAITOK);
if (!sc->ic_obuf) {
iicbus_release_bus(parent, icdev);
return ENOBUFS;
}
sc->ic_ifbuf = malloc(sc->ic_if.if_mtu + ICHDRLEN,
M_DEVBUF, M_WAITOK);
if (!sc->ic_ifbuf) {
iicbus_release_bus(parent, icdev);
return ENOBUFS;
}
iicbus_reset(parent, IIC_FASTEST, 0, NULL);
ifp->if_flags |= IFF_RUNNING;
}
break;
case SIOCSIFMTU:
/* save previous buffers */
iptr = sc->ic_ifbuf;
optr = sc->ic_obuf;
/* allocate input buffer */
sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT);
if (!sc->ic_ifbuf) {
sc->ic_ifbuf = iptr;
sc->ic_obuf = optr;
return ENOBUFS;
}
/* allocate output buffer */
sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT);
if (!sc->ic_obuf) {
free(sc->ic_ifbuf,M_DEVBUF);
sc->ic_ifbuf = iptr;
sc->ic_obuf = optr;
return ENOBUFS;
}
if (iptr)
free(iptr,M_DEVBUF);
if (optr)
free(optr,M_DEVBUF);
sc->ic_if.if_mtu = ifr->ifr_mtu;
break;
case SIOCGIFMTU:
ifr->ifr_mtu = sc->ic_if.if_mtu;
break;
case SIOCADDMULTI:
case SIOCDELMULTI:
if (ifr == 0) {
return EAFNOSUPPORT; /* XXX */
}
switch (ifr->ifr_addr.sa_family) {
case AF_INET:
break;
default:
return EAFNOSUPPORT;
}
break;
default:
return EINVAL;
}
return 0;
}
/*
* icintr()
*/
static void
icintr (device_t dev, int event, char *ptr)
{
struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
int unit = device_get_unit(dev);
int s, len;
struct mbuf *top;
s = splhigh();
switch (event) {
case INTR_GENERAL:
case INTR_START:
sc->ic_cp = sc->ic_ifbuf;
sc->ic_xfercnt = 0;
break;
case INTR_STOP:
/* if any error occured during transfert,
* drop the packet */
if (sc->ic_iferrs)
goto err;
if ((len = sc->ic_xfercnt) == 0)
break; /* ignore */
if (len <= ICHDRLEN)
goto err;
if (IF_QFULL(&ipintrq)) {
IF_DROP(&ipintrq);
break;
}
len -= ICHDRLEN;
sc->ic_if.if_ipackets ++;
sc->ic_if.if_ibytes += len;
#if NBPFILTER > 0
if (sc->ic_if.if_bpf)
bpf_tap(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN);
#endif
top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0);
if (top) {
IF_ENQUEUE(&ipintrq, top);
schednetisr(NETISR_IP);
}
break;
err:
printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs);
sc->ic_iferrs = 0; /* reset error count */
sc->ic_if.if_ierrors ++;
break;
case INTR_RECEIVE:
if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) {
sc->ic_iferrs ++;
} else {
*sc->ic_cp++ = *ptr;
sc->ic_xfercnt ++;
}
break;
case INTR_NOACK: /* xfer terminated by master */
break;
case INTR_TRANSMIT:
*ptr = 0xff; /* XXX */
break;
case INTR_ERROR:
sc->ic_iferrs ++;
break;
default:
panic("%s: unknown event (%d)!", __FUNCTION__, event);
}
splx(s);
return;
}
/*
* icoutput()
*/
static int
icoutput(struct ifnet *ifp, struct mbuf *m,
struct sockaddr *dst, struct rtentry *rt)
{
device_t icdev = devclass_get_device(ic_devclass, ifp->if_unit);
device_t parent = device_get_parent(icdev);
struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
int s, len, sent;
struct mbuf *mm;
u_char *cp;
u_int hdr = dst->sa_family;
ifp->if_flags |= IFF_RUNNING;
s = splhigh();
/* already sending? */
if (sc->ic_sending) {
ifp->if_oerrors ++;
goto error;
}
/* insert header */
bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN);
cp = sc->ic_obuf + ICHDRLEN;
len = 0;
mm = m;
do {
if (len + mm->m_len > sc->ic_if.if_mtu) {
/* packet to large */
ifp->if_oerrors ++;
goto error;
}
bcopy(mtod(mm,char *), cp, mm->m_len);
cp += mm->m_len;
len += mm->m_len;
} while ((mm = mm->m_next));
#if NBPFILTER > 0
if (ifp->if_bpf) {
struct mbuf m0, *n = m;
/*
* We need to prepend the address family as
* a four byte field. Cons up a dummy header
* to pacify bpf. This is safe because bpf
* will only read from the mbuf (i.e., it won't
* try to free it or keep a pointer a to it).
*/
m0.m_next = m;
m0.m_len = sizeof(u_int);
m0.m_data = (char *)&hdr;
n = &m0;
bpf_mtap(ifp, n);
}
#endif
sc->ic_sending = 1;
m_freem(m);
splx(s);
/* send the packet */
if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf,
len + ICHDRLEN, &sent))
ifp->if_oerrors ++;
else {
ifp->if_opackets ++;
ifp->if_obytes += len;
}
sc->ic_sending = 0;
return (0);
error:
m_freem(m);
splx(s);
return(0);
}
DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0);