2 * Copyright (c) 1998 Nicolas Souchu
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: src/sys/dev/iicbus/if_ic.c,v 1.8 1999/12/29 04:35:39 peter Exp $
34 #include <sys/param.h>
35 #include <sys/systm.h>
38 #include <sys/socket.h>
39 #include <sys/filio.h>
40 #include <sys/sockio.h>
41 #include <sys/kernel.h>
42 #include <sys/module.h>
45 #include <sys/malloc.h>
46 #include <sys/thread2.h>
49 #include <net/ifq_var.h>
50 #include <net/if_types.h>
51 #include <net/netisr.h>
55 #include <sys/socket.h>
56 #include <net/netisr.h>
57 #include <net/route.h>
58 #include <netinet/in.h>
59 #include <netinet/in_systm.h>
60 #include <netinet/in_var.h>
61 #include <netinet/ip.h>
62 #include <netinet/if_ether.h>
66 #include <bus/iicbus/iiconf.h>
67 #include <bus/iicbus/iicbus.h>
69 #include "iicbus_if.h"
71 #define PCF_MASTER_ADDRESS 0xaa
73 #define ICHDRLEN sizeof(uint32_t)
74 #define ICMTU 1500 /* default mtu */
79 u_char ic_addr; /* peer I2C address */
92 static devclass_t ic_devclass;
94 static int icprobe(device_t);
95 static int icattach(device_t);
97 static int icioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
98 static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
101 static void icintr(device_t, int, char *);
103 static device_method_t ic_methods[] = {
104 /* device interface */
105 DEVMETHOD(device_probe, icprobe),
106 DEVMETHOD(device_attach, icattach),
108 /* iicbus interface */
109 DEVMETHOD(iicbus_intr, icintr),
114 static driver_t ic_driver = {
117 sizeof(struct ic_softc),
124 icprobe(device_t dev)
133 icattach(device_t dev)
135 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
136 struct ifnet *ifp = &sc->ic_if;
138 sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */
141 if_initname(ifp, "ic", device_get_unit(dev));
143 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
144 ifp->if_ioctl = icioctl;
145 ifp->if_output = icoutput;
146 ifp->if_type = IFT_PARA;
149 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN);
151 if_attach(ifp, NULL);
153 bpfattach(ifp, DLT_NULL, ICHDRLEN);
162 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
164 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
165 device_t parent = device_get_parent(icdev);
166 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
168 struct ifaddr *ifa = (struct ifaddr *)data;
169 struct ifreq *ifr = (struct ifreq *)data;
179 if (ifa->ifa_addr->sa_family != AF_INET)
181 ifp->if_flags |= IFF_UP;
184 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
186 /* XXX disable PCF */
187 ifp->if_flags &= ~IFF_RUNNING;
189 /* IFF_UP is not set, try to release the bus anyway */
190 iicbus_release_bus(parent, icdev);
193 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
195 if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR)))
198 sc->ic_obuf = kmalloc(sc->ic_if.if_mtu + ICHDRLEN,
201 sc->ic_ifbuf = kmalloc(sc->ic_if.if_mtu + ICHDRLEN,
204 iicbus_reset(parent, IIC_FASTEST, 0, NULL);
206 ifp->if_flags |= IFF_RUNNING;
211 /* save previous buffers */
215 /* allocate input buffer */
216 sc->ic_ifbuf = kmalloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK);
218 /* allocate output buffer */
219 sc->ic_ifbuf = kmalloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK);
222 kfree(iptr,M_DEVBUF);
225 kfree(optr,M_DEVBUF);
227 sc->ic_if.if_mtu = ifr->ifr_mtu;
231 ifr->ifr_mtu = sc->ic_if.if_mtu;
237 return EAFNOSUPPORT; /* XXX */
239 switch (ifr->ifr_addr.sa_family) {
259 icintr (device_t dev, int event, char *ptr)
261 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
262 int unit = device_get_unit(dev);
272 sc->ic_cp = sc->ic_ifbuf;
278 /* if any error occured during transfert,
283 if ((len = sc->ic_xfercnt) == 0)
290 IFNET_STAT_INC(&sc->ic_if, ipackets, 1);
291 IFNET_STAT_INC(&sc->ic_if, ibytes, len);
293 BPF_TAP(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN);
295 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0);
298 netisr_queue(NETISR_IP, top);
302 kprintf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs);
304 sc->ic_iferrs = 0; /* reset error count */
305 IFNET_STAT_INC(&sc->ic_if, ierrors, 1);
310 if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) {
319 case INTR_NOACK: /* xfer terminated by master */
323 *ptr = 0xff; /* XXX */
331 panic("%s: unknown event (%d)!", __func__, event);
341 icoutput(struct ifnet *ifp, struct mbuf *m,
342 struct sockaddr *dst, struct rtentry *rt)
344 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
345 device_t parent = device_get_parent(icdev);
346 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
350 uint32_t hdr = dst->sa_family;
352 ifp->if_flags |= IFF_RUNNING;
356 /* already sending? */
357 if (sc->ic_sending) {
358 IFNET_STAT_INC(ifp, oerrors, 1);
363 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN);
365 cp = sc->ic_obuf + ICHDRLEN;
369 if (len + mm->m_len > sc->ic_if.if_mtu) {
370 /* packet to large */
371 IFNET_STAT_INC(ifp, oerrors, 1);
375 bcopy(mtod(mm,char *), cp, mm->m_len);
379 } while ((mm = mm->m_next));
384 bpf_ptap(ifp->if_bpf, m, &hdr, ICHDRLEN);
394 /* send the packet */
395 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf,
396 len + ICHDRLEN, &sent))
398 IFNET_STAT_INC(ifp, oerrors, 1);
400 IFNET_STAT_INC(ifp, opackets, 1);
401 IFNET_STAT_INC(ifp, obytes, len);
415 DRIVER_MODULE(if_ic, iicbus, ic_driver, ic_devclass, NULL, NULL);
416 MODULE_DEPEND(if_ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
417 MODULE_VERSION(if_ic, 1);