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/route.h>
57 #include <netinet/in.h>
58 #include <netinet/in_systm.h>
59 #include <netinet/in_var.h>
60 #include <netinet/ip.h>
61 #include <netinet/if_ether.h>
65 #include <bus/iicbus/iiconf.h>
66 #include <bus/iicbus/iicbus.h>
68 #include "iicbus_if.h"
70 #define PCF_MASTER_ADDRESS 0xaa
72 #define ICHDRLEN sizeof(uint32_t)
73 #define ICMTU 1500 /* default mtu */
78 u_char ic_addr; /* peer I2C address */
91 static devclass_t ic_devclass;
93 static int icprobe(device_t);
94 static int icattach(device_t);
96 static int icioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
97 static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
100 static void icintr(device_t, int, char *);
102 static device_method_t ic_methods[] = {
103 /* device interface */
104 DEVMETHOD(device_probe, icprobe),
105 DEVMETHOD(device_attach, icattach),
107 /* iicbus interface */
108 DEVMETHOD(iicbus_intr, icintr),
113 static driver_t ic_driver = {
116 sizeof(struct ic_softc),
123 icprobe(device_t dev)
132 icattach(device_t dev)
134 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
135 struct ifnet *ifp = &sc->ic_if;
137 sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */
140 if_initname(ifp, "ic", device_get_unit(dev));
142 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
143 ifp->if_ioctl = icioctl;
144 ifp->if_output = icoutput;
145 ifp->if_type = IFT_PARA;
148 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN);
150 if_attach(ifp, NULL);
152 bpfattach(ifp, DLT_NULL, ICHDRLEN);
161 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
163 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
164 device_t parent = device_get_parent(icdev);
165 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
167 struct ifaddr *ifa = (struct ifaddr *)data;
168 struct ifreq *ifr = (struct ifreq *)data;
178 if (ifa->ifa_addr->sa_family != AF_INET)
180 ifp->if_flags |= IFF_UP;
183 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
185 /* XXX disable PCF */
186 ifp->if_flags &= ~IFF_RUNNING;
188 /* IFF_UP is not set, try to release the bus anyway */
189 iicbus_release_bus(parent, icdev);
192 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
194 if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR)))
197 sc->ic_obuf = kmalloc(sc->ic_if.if_mtu + ICHDRLEN,
200 sc->ic_ifbuf = kmalloc(sc->ic_if.if_mtu + ICHDRLEN,
203 iicbus_reset(parent, IIC_FASTEST, 0, NULL);
205 ifp->if_flags |= IFF_RUNNING;
210 /* save previous buffers */
214 /* allocate input buffer */
215 sc->ic_ifbuf = kmalloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK);
217 /* allocate output buffer */
218 sc->ic_obuf = kmalloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK);
221 kfree(iptr,M_DEVBUF);
224 kfree(optr,M_DEVBUF);
226 sc->ic_if.if_mtu = ifr->ifr_mtu;
230 ifr->ifr_mtu = sc->ic_if.if_mtu;
236 return EAFNOSUPPORT; /* XXX */
238 switch (ifr->ifr_addr.sa_family) {
258 icintr (device_t dev, int event, char *ptr)
260 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
261 int unit = device_get_unit(dev);
271 sc->ic_cp = sc->ic_ifbuf;
277 /* if any error occured during transfert,
282 if ((len = sc->ic_xfercnt) == 0)
289 IFNET_STAT_INC(&sc->ic_if, ipackets, 1);
290 IFNET_STAT_INC(&sc->ic_if, ibytes, len);
292 BPF_TAP(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN);
294 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0);
297 netisr_queue(NETISR_IP, top);
301 kprintf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs);
303 sc->ic_iferrs = 0; /* reset error count */
304 IFNET_STAT_INC(&sc->ic_if, ierrors, 1);
309 if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) {
318 case INTR_NOACK: /* xfer terminated by master */
322 *ptr = 0xff; /* XXX */
330 panic("%s: unknown event (%d)!", __func__, event);
340 icoutput(struct ifnet *ifp, struct mbuf *m,
341 struct sockaddr *dst, struct rtentry *rt)
343 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
344 device_t parent = device_get_parent(icdev);
345 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
349 uint32_t hdr = dst->sa_family;
351 ifp->if_flags |= IFF_RUNNING;
355 /* already sending? */
356 if (sc->ic_sending) {
357 IFNET_STAT_INC(ifp, oerrors, 1);
362 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN);
364 cp = sc->ic_obuf + ICHDRLEN;
368 if (len + mm->m_len > sc->ic_if.if_mtu) {
369 /* packet to large */
370 IFNET_STAT_INC(ifp, oerrors, 1);
374 bcopy(mtod(mm,char *), cp, mm->m_len);
378 } while ((mm = mm->m_next));
383 bpf_ptap(ifp->if_bpf, m, &hdr, ICHDRLEN);
393 /* send the packet */
394 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf,
395 len + ICHDRLEN, &sent))
397 IFNET_STAT_INC(ifp, oerrors, 1);
399 IFNET_STAT_INC(ifp, opackets, 1);
400 IFNET_STAT_INC(ifp, obytes, len);
414 DRIVER_MODULE(if_ic, iicbus, ic_driver, ic_devclass, NULL, NULL);
415 MODULE_DEPEND(if_ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
416 MODULE_VERSION(if_ic, 1);