2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 1998, 2001 Nicolas Souchu
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/systm.h>
39 #include <sys/socket.h>
40 #include <sys/filio.h>
41 #include <sys/sockio.h>
42 #include <sys/kernel.h>
44 #include <sys/module.h>
45 #include <sys/mutex.h>
48 #include <sys/malloc.h>
51 #include <net/if_var.h>
52 #include <net/if_types.h>
53 #include <net/netisr.h>
55 #include <net/route.h>
56 #include <netinet/in.h>
57 #include <netinet/in_systm.h>
58 #include <netinet/in_var.h>
59 #include <netinet/ip.h>
60 #include <netinet/if_ether.h>
64 #include <dev/iicbus/iiconf.h>
65 #include <dev/iicbus/iicbus.h>
67 #include "iicbus_if.h"
69 #define PCF_MASTER_ADDRESS 0xaa
71 #define ICHDRLEN sizeof(u_int32_t)
72 #define ICMTU 1500 /* default mtu */
78 u_char ic_addr; /* peer I2C address */
93 #define IC_SENDING 0x0001
94 #define IC_OBUF_BUSY 0x0002
95 #define IC_IFBUF_BUSY 0x0004
96 #define IC_BUFFERS_BUSY (IC_OBUF_BUSY | IC_IFBUF_BUSY)
97 #define IC_BUFFER_WAITER 0x0004
99 static devclass_t ic_devclass;
101 static int icprobe(device_t);
102 static int icattach(device_t);
104 static int icioctl(struct ifnet *, u_long, caddr_t);
105 static int icoutput(struct ifnet *, struct mbuf *, const struct sockaddr *,
108 static int icintr(device_t, int, char *);
110 static device_method_t ic_methods[] = {
111 /* device interface */
112 DEVMETHOD(device_probe, icprobe),
113 DEVMETHOD(device_attach, icattach),
115 /* iicbus interface */
116 DEVMETHOD(iicbus_intr, icintr),
121 static driver_t ic_driver = {
124 sizeof(struct ic_softc),
128 ic_alloc_buffers(struct ic_softc *sc, int mtu)
132 obuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK);
133 ifbuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK);
135 mtx_lock(&sc->ic_lock);
136 while (sc->ic_flags & IC_BUFFERS_BUSY) {
137 sc->ic_flags |= IC_BUFFER_WAITER;
138 mtx_sleep(sc, &sc->ic_lock, 0, "icalloc", 0);
139 sc->ic_flags &= ~IC_BUFFER_WAITER;
142 free(sc->ic_obuf, M_DEVBUF);
143 free(sc->ic_ifbuf, M_DEVBUF);
145 sc->ic_ifbuf = ifbuf;
146 sc->ic_ifp->if_mtu = mtu;
147 mtx_unlock(&sc->ic_lock);
154 icprobe(device_t dev)
156 return (BUS_PROBE_NOWILDCARD);
163 icattach(device_t dev)
165 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
168 ifp = sc->ic_ifp = if_alloc(IFT_PARA);
172 mtx_init(&sc->ic_lock, device_get_nameunit(dev), MTX_NETWORK_LOCK,
174 sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */
178 if_initname(ifp, device_get_name(dev), device_get_unit(dev));
179 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
180 ifp->if_ioctl = icioctl;
181 ifp->if_output = icoutput;
184 ifp->if_snd.ifq_maxlen = ifqmaxlen;
186 ic_alloc_buffers(sc, ICMTU);
190 bpfattach(ifp, DLT_NULL, ICHDRLEN);
199 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
201 struct ic_softc *sc = ifp->if_softc;
202 device_t icdev = sc->ic_dev;
203 device_t parent = device_get_parent(icdev);
204 struct ifaddr *ifa = (struct ifaddr *)data;
205 struct ifreq *ifr = (struct ifreq *)data;
212 if (ifa->ifa_addr->sa_family != AF_INET)
213 return (EAFNOSUPPORT);
214 mtx_lock(&sc->ic_lock);
215 ifp->if_flags |= IFF_UP;
218 mtx_lock(&sc->ic_lock);
220 if ((!(ifp->if_flags & IFF_UP)) &&
221 (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
223 /* XXX disable PCF */
224 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
225 mtx_unlock(&sc->ic_lock);
227 /* IFF_UP is not set, try to release the bus anyway */
228 iicbus_release_bus(parent, icdev);
231 if (((ifp->if_flags & IFF_UP)) &&
232 (!(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
233 mtx_unlock(&sc->ic_lock);
234 if ((error = iicbus_request_bus(parent, icdev,
235 IIC_WAIT | IIC_INTR)))
237 mtx_lock(&sc->ic_lock);
238 iicbus_reset(parent, IIC_FASTEST, 0, NULL);
239 ifp->if_drv_flags |= IFF_DRV_RUNNING;
241 mtx_unlock(&sc->ic_lock);
245 ic_alloc_buffers(sc, ifr->ifr_mtu);
249 mtx_lock(&sc->ic_lock);
250 ifr->ifr_mtu = sc->ic_ifp->if_mtu;
251 mtx_unlock(&sc->ic_lock);
257 return (EAFNOSUPPORT); /* XXX */
258 switch (ifr->ifr_addr.sa_family) {
262 return (EAFNOSUPPORT);
275 icintr(device_t dev, int event, char *ptr)
277 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
281 mtx_lock(&sc->ic_lock);
287 sc->ic_cp = sc->ic_ifbuf;
289 sc->ic_flags |= IC_IFBUF_BUSY;
294 /* if any error occurred during transfert,
296 sc->ic_flags &= ~IC_IFBUF_BUSY;
297 if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) ==
302 if ((len = sc->ic_xfercnt) == 0)
307 if_inc_counter(sc->ic_ifp, IFCOUNTER_IPACKETS, 1);
308 if_inc_counter(sc->ic_ifp, IFCOUNTER_IBYTES, len);
309 BPF_TAP(sc->ic_ifp, sc->ic_ifbuf, len + ICHDRLEN);
310 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, sc->ic_ifp, 0);
312 mtx_unlock(&sc->ic_lock);
313 M_SETFIB(top, sc->ic_ifp->if_fib);
314 netisr_dispatch(NETISR_IP, top);
315 mtx_lock(&sc->ic_lock);
319 if_printf(sc->ic_ifp, "errors (%d)!\n", sc->ic_iferrs);
320 sc->ic_iferrs = 0; /* reset error count */
321 if_inc_counter(sc->ic_ifp, IFCOUNTER_IERRORS, 1);
325 if (sc->ic_xfercnt >= sc->ic_ifp->if_mtu + ICHDRLEN) {
333 case INTR_NOACK: /* xfer terminated by master */
337 *ptr = 0xff; /* XXX */
345 panic("%s: unknown event (%d)!", __func__, event);
348 mtx_unlock(&sc->ic_lock);
356 icoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
359 struct ic_softc *sc = ifp->if_softc;
360 device_t icdev = sc->ic_dev;
361 device_t parent = device_get_parent(icdev);
367 /* BPF writes need to be handled specially. */
368 if (dst->sa_family == AF_UNSPEC)
369 bcopy(dst->sa_data, &hdr, sizeof(hdr));
371 hdr = dst->sa_family;
373 mtx_lock(&sc->ic_lock);
374 ifp->if_drv_flags |= IFF_DRV_RUNNING;
376 /* already sending? */
377 if (sc->ic_flags & IC_SENDING) {
378 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
383 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN);
385 cp = sc->ic_obuf + ICHDRLEN;
389 if (len + mm->m_len > sc->ic_ifp->if_mtu) {
390 /* packet too large */
391 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
395 bcopy(mtod(mm,char *), cp, mm->m_len);
399 } while ((mm = mm->m_next));
401 BPF_MTAP2(ifp, &hdr, sizeof(hdr), m);
403 sc->ic_flags |= (IC_SENDING | IC_OBUF_BUSY);
406 mtx_unlock(&sc->ic_lock);
408 /* send the packet */
409 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf,
410 len + ICHDRLEN, &sent))
412 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
414 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
415 if_inc_counter(ifp, IFCOUNTER_OBYTES, len);
418 mtx_lock(&sc->ic_lock);
419 sc->ic_flags &= ~(IC_SENDING | IC_OBUF_BUSY);
420 if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) ==
423 mtx_unlock(&sc->ic_lock);
429 mtx_unlock(&sc->ic_lock);
434 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0);
435 MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
436 MODULE_VERSION(ic, 1);