2 * Copyright (c) 1998, 2001 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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
34 #include <sys/param.h>
35 #include <sys/systm.h>
37 #include <sys/socket.h>
38 #include <sys/filio.h>
39 #include <sys/sockio.h>
40 #include <sys/kernel.h>
42 #include <sys/module.h>
43 #include <sys/mutex.h>
46 #include <sys/malloc.h>
49 #include <net/if_types.h>
50 #include <net/netisr.h>
52 #include <net/route.h>
53 #include <netinet/in.h>
54 #include <netinet/in_systm.h>
55 #include <netinet/in_var.h>
56 #include <netinet/ip.h>
57 #include <netinet/if_ether.h>
61 #include <dev/iicbus/iiconf.h>
62 #include <dev/iicbus/iicbus.h>
64 #include "iicbus_if.h"
66 #define PCF_MASTER_ADDRESS 0xaa
68 #define ICHDRLEN sizeof(u_int32_t)
69 #define ICMTU 1500 /* default mtu */
75 u_char ic_addr; /* peer I2C address */
90 #define IC_SENDING 0x0001
91 #define IC_OBUF_BUSY 0x0002
92 #define IC_IFBUF_BUSY 0x0004
93 #define IC_BUFFERS_BUSY (IC_OBUF_BUSY | IC_IFBUF_BUSY)
94 #define IC_BUFFER_WAITER 0x0004
96 static devclass_t ic_devclass;
98 static int icprobe(device_t);
99 static int icattach(device_t);
101 static int icioctl(struct ifnet *, u_long, caddr_t);
102 static int icoutput(struct ifnet *, struct mbuf *, const struct sockaddr *,
105 static int icintr(device_t, int, char *);
107 static device_method_t ic_methods[] = {
108 /* device interface */
109 DEVMETHOD(device_probe, icprobe),
110 DEVMETHOD(device_attach, icattach),
112 /* iicbus interface */
113 DEVMETHOD(iicbus_intr, icintr),
118 static driver_t ic_driver = {
121 sizeof(struct ic_softc),
125 ic_alloc_buffers(struct ic_softc *sc, int mtu)
129 obuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK);
130 ifbuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK);
132 mtx_lock(&sc->ic_lock);
133 while (sc->ic_flags & IC_BUFFERS_BUSY) {
134 sc->ic_flags |= IC_BUFFER_WAITER;
135 mtx_sleep(sc, &sc->ic_lock, 0, "icalloc", 0);
136 sc->ic_flags &= ~IC_BUFFER_WAITER;
139 free(sc->ic_obuf, M_DEVBUF);
140 free(sc->ic_ifbuf, M_DEVBUF);
142 sc->ic_ifbuf = ifbuf;
143 sc->ic_ifp->if_mtu = mtu;
144 mtx_unlock(&sc->ic_lock);
151 icprobe(device_t dev)
153 return (BUS_PROBE_NOWILDCARD);
160 icattach(device_t dev)
162 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
165 ifp = sc->ic_ifp = if_alloc(IFT_PARA);
169 mtx_init(&sc->ic_lock, device_get_nameunit(dev), MTX_NETWORK_LOCK,
171 sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */
175 if_initname(ifp, device_get_name(dev), device_get_unit(dev));
176 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
177 ifp->if_ioctl = icioctl;
178 ifp->if_output = icoutput;
181 ifp->if_snd.ifq_maxlen = ifqmaxlen;
183 ic_alloc_buffers(sc, ICMTU);
187 bpfattach(ifp, DLT_NULL, ICHDRLEN);
196 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
198 struct ic_softc *sc = ifp->if_softc;
199 device_t icdev = sc->ic_dev;
200 device_t parent = device_get_parent(icdev);
201 struct ifaddr *ifa = (struct ifaddr *)data;
202 struct ifreq *ifr = (struct ifreq *)data;
210 if (ifa->ifa_addr->sa_family != AF_INET)
211 return (EAFNOSUPPORT);
212 mtx_lock(&sc->ic_lock);
213 ifp->if_flags |= IFF_UP;
216 mtx_lock(&sc->ic_lock);
218 if ((!(ifp->if_flags & IFF_UP)) &&
219 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
221 /* XXX disable PCF */
222 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
223 mtx_unlock(&sc->ic_lock);
225 /* IFF_UP is not set, try to release the bus anyway */
226 iicbus_release_bus(parent, icdev);
229 if (((ifp->if_flags & IFF_UP)) &&
230 (!(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
231 mtx_unlock(&sc->ic_lock);
232 if ((error = iicbus_request_bus(parent, icdev,
233 IIC_WAIT | IIC_INTR)))
235 mtx_lock(&sc->ic_lock);
236 iicbus_reset(parent, IIC_FASTEST, 0, NULL);
237 ifp->if_drv_flags |= IFF_DRV_RUNNING;
239 mtx_unlock(&sc->ic_lock);
243 ic_alloc_buffers(sc, ifr->ifr_mtu);
247 mtx_lock(&sc->ic_lock);
248 ifr->ifr_mtu = sc->ic_ifp->if_mtu;
249 mtx_unlock(&sc->ic_lock);
255 return (EAFNOSUPPORT); /* XXX */
256 switch (ifr->ifr_addr.sa_family) {
260 return (EAFNOSUPPORT);
273 icintr(device_t dev, int event, char *ptr)
275 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
279 mtx_lock(&sc->ic_lock);
285 sc->ic_cp = sc->ic_ifbuf;
287 sc->ic_flags |= IC_IFBUF_BUSY;
292 /* if any error occured during transfert,
294 sc->ic_flags &= ~IC_IFBUF_BUSY;
295 if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) ==
300 if ((len = sc->ic_xfercnt) == 0)
305 sc->ic_ifp->if_ipackets++;
306 sc->ic_ifp->if_ibytes += len;
307 BPF_TAP(sc->ic_ifp, sc->ic_ifbuf, len + ICHDRLEN);
308 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, sc->ic_ifp, 0);
310 mtx_unlock(&sc->ic_lock);
311 M_SETFIB(top, sc->ic_ifp->if_fib);
312 netisr_dispatch(NETISR_IP, top);
313 mtx_lock(&sc->ic_lock);
317 if_printf(sc->ic_ifp, "errors (%d)!\n", sc->ic_iferrs);
318 sc->ic_iferrs = 0; /* reset error count */
319 sc->ic_ifp->if_ierrors++;
323 if (sc->ic_xfercnt >= sc->ic_ifp->if_mtu + ICHDRLEN) {
331 case INTR_NOACK: /* xfer terminated by master */
335 *ptr = 0xff; /* XXX */
343 panic("%s: unknown event (%d)!", __func__, event);
346 mtx_unlock(&sc->ic_lock);
354 icoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
357 struct ic_softc *sc = ifp->if_softc;
358 device_t icdev = sc->ic_dev;
359 device_t parent = device_get_parent(icdev);
365 /* BPF writes need to be handled specially. */
366 if (dst->sa_family == AF_UNSPEC)
367 bcopy(dst->sa_data, &hdr, sizeof(hdr));
369 hdr = dst->sa_family;
371 mtx_lock(&sc->ic_lock);
372 ifp->if_drv_flags |= IFF_DRV_RUNNING;
374 /* already sending? */
375 if (sc->ic_flags & IC_SENDING) {
381 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN);
383 cp = sc->ic_obuf + ICHDRLEN;
387 if (len + mm->m_len > sc->ic_ifp->if_mtu) {
388 /* packet too large */
393 bcopy(mtod(mm,char *), cp, mm->m_len);
397 } while ((mm = mm->m_next));
399 BPF_MTAP2(ifp, &hdr, sizeof(hdr), m);
401 sc->ic_flags |= (IC_SENDING | IC_OBUF_BUSY);
404 mtx_unlock(&sc->ic_lock);
406 /* send the packet */
407 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf,
408 len + ICHDRLEN, &sent))
413 ifp->if_obytes += len;
416 mtx_lock(&sc->ic_lock);
417 sc->ic_flags &= ~(IC_SENDING | IC_OBUF_BUSY);
418 if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) ==
421 mtx_unlock(&sc->ic_lock);
427 mtx_unlock(&sc->ic_lock);
432 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0);
433 MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
434 MODULE_VERSION(ic, 1);