xref: /dragonfly/sys/dev/netif/ic/if_ic.c (revision af79c6e5) 
1 /*-
2  * Copyright (c) 1998 Nicolas Souchu
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
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.
13  *
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
24  * SUCH DAMAGE.
25  *
26  * $FreeBSD: src/sys/dev/iicbus/if_ic.c,v 1.8 1999/12/29 04:35:39 peter Exp $
27  * $DragonFly: src/sys/dev/netif/ic/if_ic.c,v 1.5 2003/11/20 22:07:28 dillon Exp $
28  */
29 
30 /*
31  * I2C bus IP driver
32  */
33 
34 #ifdef _KERNEL
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/proc.h>
38 #include <sys/mbuf.h>
39 #include <sys/socket.h>
40 #include <sys/filio.h>
41 #include <sys/sockio.h>
42 #include <sys/kernel.h>
43 #include <sys/module.h>
44 #include <sys/bus.h>
45 #include <sys/time.h>
46 #include <sys/malloc.h>
47 
48 #include <net/if.h>
49 #include <net/if_types.h>
50 #include <net/netisr.h>
51 
52 #endif
53 #include <sys/mbuf.h>
54 #include <sys/socket.h>
55 #include <net/netisr.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>
62 
63 #include <net/bpf.h>
64 
65 #include <bus/iicbus/iiconf.h>
66 #include <bus/iicbus/iicbus.h>
67 
68 #include "iicbus_if.h"
69 
70 #define ICHDRLEN	sizeof(u_int)
71 #define ICMTU		1500		/* default mtu */
72 
73 struct ic_softc {
74 	struct ifnet ic_if;
75 
76 	u_char ic_addr;			/* peer I2C address */
77 
78 	int ic_sending;
79 
80 	char *ic_obuf;
81 	char *ic_ifbuf;
82 	char *ic_cp;
83 
84 	int ic_xfercnt;
85 
86 	int ic_iferrs;
87 };
88 
89 static devclass_t ic_devclass;
90 
91 static int icprobe(device_t);
92 static int icattach(device_t);
93 
94 static int icioctl(struct ifnet *, u_long, caddr_t);
95 static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
96 		struct rtentry *);
97 
98 static void icintr(device_t, int, char *);
99 
100 static device_method_t ic_methods[] = {
101 	/* device interface */
102 	DEVMETHOD(device_probe,		icprobe),
103 	DEVMETHOD(device_attach,	icattach),
104 
105 	/* iicbus interface */
106 	DEVMETHOD(iicbus_intr,		icintr),
107 
108 	{ 0, 0 }
109 };
110 
111 static driver_t ic_driver = {
112 	"ic",
113 	ic_methods,
114 	sizeof(struct ic_softc),
115 };
116 
117 /*
118  * icprobe()
119  */
120 static int
121 icprobe(device_t dev)
122 {
123 	return (0);
124 }
125 
126 /*
127  * icattach()
128  */
129 static int
130 icattach(device_t dev)
131 {
132 	struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
133 	struct ifnet *ifp = &sc->ic_if;
134 
135 	sc->ic_addr = iicbus_get_addr(dev);
136 
137 	ifp->if_softc = sc;
138 	ifp->if_name = "ic";
139 	ifp->if_unit = device_get_unit(dev);
140 	ifp->if_mtu = ICMTU;
141 	ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
142 	ifp->if_ioctl = icioctl;
143 	ifp->if_output = icoutput;
144 	ifp->if_type = IFT_PARA;
145 	ifp->if_hdrlen = 0;
146 	ifp->if_addrlen = 0;
147 	ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
148 
149 	if_attach(ifp);
150 
151 	bpfattach(ifp, DLT_NULL, ICHDRLEN);
152 
153 	return (0);
154 }
155 
156 /*
157  * iciotcl()
158  */
159 static int
160 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
161 {
162     device_t icdev = devclass_get_device(ic_devclass, ifp->if_unit);
163     device_t parent = device_get_parent(icdev);
164     struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
165 
166     struct ifaddr *ifa = (struct ifaddr *)data;
167     struct ifreq *ifr = (struct ifreq *)data;
168 
169     u_char *iptr, *optr;
170     int error;
171 
172     switch (cmd) {
173 
174     case SIOCSIFDSTADDR:
175     case SIOCAIFADDR:
176     case SIOCSIFADDR:
177 	if (ifa->ifa_addr->sa_family != AF_INET)
178 	    return EAFNOSUPPORT;
179 	ifp->if_flags |= IFF_UP;
180 	/* FALLTHROUGH */
181     case SIOCSIFFLAGS:
182 	if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
183 
184 	    /* XXX disable PCF */
185 	    ifp->if_flags &= ~IFF_RUNNING;
186 
187 	    /* IFF_UP is not set, try to release the bus anyway */
188 	    iicbus_release_bus(parent, icdev);
189 	    break;
190 	}
191 	if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
192 
193 	    if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR)))
194 		return (error);
195 
196 	    sc->ic_obuf = malloc(sc->ic_if.if_mtu + ICHDRLEN,
197 				  M_DEVBUF, M_WAITOK);
198 	    if (!sc->ic_obuf) {
199 		iicbus_release_bus(parent, icdev);
200 		return ENOBUFS;
201 	    }
202 
203 	    sc->ic_ifbuf = malloc(sc->ic_if.if_mtu + ICHDRLEN,
204 				  M_DEVBUF, M_WAITOK);
205 	    if (!sc->ic_ifbuf) {
206 		iicbus_release_bus(parent, icdev);
207 		return ENOBUFS;
208 	    }
209 
210 	    iicbus_reset(parent, IIC_FASTEST, 0, NULL);
211 
212 	    ifp->if_flags |= IFF_RUNNING;
213 	}
214 	break;
215 
216     case SIOCSIFMTU:
217 	/* save previous buffers */
218 	iptr = sc->ic_ifbuf;
219 	optr = sc->ic_obuf;
220 
221 	/* allocate input buffer */
222 	sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT);
223 	if (!sc->ic_ifbuf) {
224 
225 	    sc->ic_ifbuf = iptr;
226 	    sc->ic_obuf = optr;
227 
228 	    return ENOBUFS;
229 	}
230 
231 	/* allocate output buffer */
232 	sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT);
233 	if (!sc->ic_obuf) {
234 
235 	    free(sc->ic_ifbuf,M_DEVBUF);
236 
237 	    sc->ic_ifbuf = iptr;
238 	    sc->ic_obuf = optr;
239 
240 	    return ENOBUFS;
241 	}
242 
243 	if (iptr)
244 	    free(iptr,M_DEVBUF);
245 
246 	if (optr)
247 	    free(optr,M_DEVBUF);
248 
249 	sc->ic_if.if_mtu = ifr->ifr_mtu;
250 	break;
251 
252     case SIOCGIFMTU:
253 	ifr->ifr_mtu = sc->ic_if.if_mtu;
254 	break;
255 
256     case SIOCADDMULTI:
257     case SIOCDELMULTI:
258 	if (ifr == 0) {
259 	    return EAFNOSUPPORT;		/* XXX */
260 	}
261 	switch (ifr->ifr_addr.sa_family) {
262 
263 	case AF_INET:
264 	    break;
265 
266 	default:
267 	    return EAFNOSUPPORT;
268 	}
269 	break;
270 
271     default:
272 	return EINVAL;
273     }
274     return 0;
275 }
276 
277 /*
278  * icintr()
279  */
280 static void
281 icintr (device_t dev, int event, char *ptr)
282 {
283 	struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
284 	int unit = device_get_unit(dev);
285 	int s, len;
286 	struct mbuf *top;
287 
288 	s = splhigh();
289 
290 	switch (event) {
291 
292 	case INTR_GENERAL:
293 	case INTR_START:
294 		sc->ic_cp = sc->ic_ifbuf;
295 		sc->ic_xfercnt = 0;
296 		break;
297 
298 	case INTR_STOP:
299 
300 	  /* if any error occured during transfert,
301 	   * drop the packet */
302 	  if (sc->ic_iferrs)
303 	    goto err;
304 
305 	  if ((len = sc->ic_xfercnt) == 0)
306 		break;					/* ignore */
307 
308 	  if (len <= ICHDRLEN)
309 	    goto err;
310 
311 	  len -= ICHDRLEN;
312 	  sc->ic_if.if_ipackets ++;
313 	  sc->ic_if.if_ibytes += len;
314 
315 	if (sc->ic_if.if_bpf)
316 		bpf_tap(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN);
317 
318 	  top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0);
319 
320 	  if (top)
321 	    netisr_dispatch(NETISR_IP, top);
322 	  break;
323 
324 	err:
325 	  printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs);
326 
327 	  sc->ic_iferrs = 0;			/* reset error count */
328 	  sc->ic_if.if_ierrors ++;
329 
330 	  break;
331 
332 	case INTR_RECEIVE:
333 		if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) {
334 			sc->ic_iferrs ++;
335 
336 		} else {
337 			*sc->ic_cp++ = *ptr;
338 			sc->ic_xfercnt ++;
339 		}
340 		break;
341 
342 	case INTR_NOACK:			/* xfer terminated by master */
343 		break;
344 
345 	case INTR_TRANSMIT:
346 		*ptr = 0xff;					/* XXX */
347 	  	break;
348 
349 	case INTR_ERROR:
350 		sc->ic_iferrs ++;
351 		break;
352 
353 	default:
354 		panic("%s: unknown event (%d)!", __FUNCTION__, event);
355 	}
356 
357 	splx(s);
358 	return;
359 }
360 
361 /*
362  * icoutput()
363  */
364 static int
365 icoutput(struct ifnet *ifp, struct mbuf *m,
366 	struct sockaddr *dst, struct rtentry *rt)
367 {
368 	device_t icdev = devclass_get_device(ic_devclass, ifp->if_unit);
369 	device_t parent = device_get_parent(icdev);
370 	struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
371 
372 	int s, len, sent;
373 	struct mbuf *mm;
374 	u_char *cp;
375 	u_int hdr = dst->sa_family;
376 
377 	ifp->if_flags |= IFF_RUNNING;
378 
379 	s = splhigh();
380 
381 	/* already sending? */
382 	if (sc->ic_sending) {
383 		ifp->if_oerrors ++;
384 		goto error;
385 	}
386 
387 	/* insert header */
388 	bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN);
389 
390 	cp = sc->ic_obuf + ICHDRLEN;
391 	len = 0;
392 	mm = m;
393 	do {
394 		if (len + mm->m_len > sc->ic_if.if_mtu) {
395 			/* packet to large */
396 			ifp->if_oerrors ++;
397 			goto error;
398 		}
399 
400 		bcopy(mtod(mm,char *), cp, mm->m_len);
401 		cp += mm->m_len;
402 		len += mm->m_len;
403 
404 	} while ((mm = mm->m_next));
405 
406 	if (ifp->if_bpf) {
407 		struct mbuf m0, *n = m;
408 
409 		/*
410 		 * We need to prepend the address family as
411 		 * a four byte field.  Cons up a dummy header
412 		 * to pacify bpf.  This is safe because bpf
413 		 * will only read from the mbuf (i.e., it won't
414 		 * try to free it or keep a pointer a to it).
415 		 */
416 		m0.m_next = m;
417 		m0.m_len = sizeof(u_int);
418 		m0.m_data = (char *)&hdr;
419 		n = &m0;
420 
421 		bpf_mtap(ifp, n);
422 	}
423 
424 	sc->ic_sending = 1;
425 
426 	m_freem(m);
427 	splx(s);
428 
429 	/* send the packet */
430 	if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf,
431 				len + ICHDRLEN, &sent))
432 
433 		ifp->if_oerrors ++;
434 	else {
435 		ifp->if_opackets ++;
436 		ifp->if_obytes += len;
437 	}
438 
439 	sc->ic_sending = 0;
440 
441 	return (0);
442 
443 error:
444 	m_freem(m);
445 	splx(s);
446 
447 	return(0);
448 }
449 
450 DECLARE_DUMMY_MODULE(if_ic);
451 DRIVER_MODULE(if_ic, iicbus, ic_driver, ic_devclass, 0, 0);
452 
453