Submitted by: nsouch

Philips I2C bus generic support other new bus architecture.

1 files changed, 468 insertions, 0 deletions

diff --git a/sys/dev/iicbus/if_ic.c b/sys/dev/iicbus/if_ic.c
new file mode 100644
index 0000000..52626e0
--- /dev/null
+++ b/sys/dev/iicbus/if_ic.c
@@ -0,0 +1,468 @@
+/*-
+ * 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 1.1.1.11 1998/08/13 17:10:42 son 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);
+
+	    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;
+	int i;
+	
+	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);