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 */ 28 29 /* 30 * I2C bus IP driver 31 */ 32 33 #ifdef _KERNEL 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/proc.h> 37 #include <sys/mbuf.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> 43 #include <sys/bus.h> 44 #include <sys/time.h> 45 #include <sys/malloc.h> 46 47 #include <net/if.h> 48 #include <net/if_types.h> 49 #include <net/netisr.h> 50 51 #endif 52 #include <sys/mbuf.h> 53 #include <sys/socket.h> 54 #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> 61 62 #include <net/bpf.h> 63 64 #include <dev/iicbus/iiconf.h> 65 #include <dev/iicbus/iicbus.h> 66 67 #include "iicbus_if.h" 68 69 #define ICHDRLEN sizeof(u_int) 70 #define ICMTU 1500 /* default mtu */ 71 72 struct ic_softc { 73 struct ifnet ic_if; 74 75 u_char ic_addr; /* peer I2C address */ 76 77 int ic_sending; 78 79 char *ic_obuf; 80 char *ic_ifbuf; 81 char *ic_cp; 82 83 int ic_xfercnt; 84 85 int ic_iferrs; 86 }; 87 88 static devclass_t ic_devclass; 89 90 static int icprobe(device_t); 91 static int icattach(device_t); 92 93 static int icioctl(struct ifnet *, u_long, caddr_t); 94 static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 95 struct rtentry *); 96 97 static void icintr(device_t, int, char *); 98 99 static device_method_t ic_methods[] = { 100 /* device interface */ 101 DEVMETHOD(device_probe, icprobe), 102 DEVMETHOD(device_attach, icattach), 103 104 /* iicbus interface */ 105 DEVMETHOD(iicbus_intr, icintr), 106 107 { 0, 0 } 108 }; 109 110 static driver_t ic_driver = { 111 "ic", 112 ic_methods, 113 sizeof(struct ic_softc), 114 }; 115 116 /* 117 * icprobe() 118 */ 119 static int 120 icprobe(device_t dev) 121 { 122 return (0); 123 } 124 125 /* 126 * icattach() 127 */ 128 static int 129 icattach(device_t dev) 130 { 131 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 132 struct ifnet *ifp = &sc->ic_if; 133 134 sc->ic_addr = iicbus_get_addr(dev); 135 136 ifp->if_softc = sc; 137 ifp->if_name = "ic"; 138 ifp->if_unit = device_get_unit(dev); 139 ifp->if_mtu = ICMTU; 140 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 141 ifp->if_ioctl = icioctl; 142 ifp->if_output = icoutput; 143 ifp->if_type = IFT_PARA; 144 ifp->if_hdrlen = 0; 145 ifp->if_addrlen = 0; 146 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 147 148 if_attach(ifp); 149 150 bpfattach(ifp, DLT_NULL, ICHDRLEN); 151 152 return (0); 153 } 154 155 /* 156 * iciotcl() 157 */ 158 static int 159 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 160 { 161 device_t icdev = devclass_get_device(ic_devclass, ifp->if_unit); 162 device_t parent = device_get_parent(icdev); 163 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 164 165 struct ifaddr *ifa = (struct ifaddr *)data; 166 struct ifreq *ifr = (struct ifreq *)data; 167 168 u_char *iptr, *optr; 169 int error; 170 171 switch (cmd) { 172 173 case SIOCSIFDSTADDR: 174 case SIOCAIFADDR: 175 case SIOCSIFADDR: 176 if (ifa->ifa_addr->sa_family != AF_INET) 177 return EAFNOSUPPORT; 178 ifp->if_flags |= IFF_UP; 179 /* FALLTHROUGH */ 180 case SIOCSIFFLAGS: 181 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 182 183 /* XXX disable PCF */ 184 ifp->if_flags &= ~IFF_RUNNING; 185 186 /* IFF_UP is not set, try to release the bus anyway */ 187 iicbus_release_bus(parent, icdev); 188 break; 189 } 190 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 191 192 if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR))) 193 return (error); 194 195 sc->ic_obuf = malloc(sc->ic_if.if_mtu + ICHDRLEN, 196 M_DEVBUF, M_WAITOK); 197 if (!sc->ic_obuf) { 198 iicbus_release_bus(parent, icdev); 199 return ENOBUFS; 200 } 201 202 sc->ic_ifbuf = malloc(sc->ic_if.if_mtu + ICHDRLEN, 203 M_DEVBUF, M_WAITOK); 204 if (!sc->ic_ifbuf) { 205 iicbus_release_bus(parent, icdev); 206 return ENOBUFS; 207 } 208 209 iicbus_reset(parent, IIC_FASTEST, 0, NULL); 210 211 ifp->if_flags |= IFF_RUNNING; 212 } 213 break; 214 215 case SIOCSIFMTU: 216 /* save previous buffers */ 217 iptr = sc->ic_ifbuf; 218 optr = sc->ic_obuf; 219 220 /* allocate input buffer */ 221 sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT); 222 if (!sc->ic_ifbuf) { 223 224 sc->ic_ifbuf = iptr; 225 sc->ic_obuf = optr; 226 227 return ENOBUFS; 228 } 229 230 /* allocate output buffer */ 231 sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT); 232 if (!sc->ic_obuf) { 233 234 free(sc->ic_ifbuf,M_DEVBUF); 235 236 sc->ic_ifbuf = iptr; 237 sc->ic_obuf = optr; 238 239 return ENOBUFS; 240 } 241 242 if (iptr) 243 free(iptr,M_DEVBUF); 244 245 if (optr) 246 free(optr,M_DEVBUF); 247 248 sc->ic_if.if_mtu = ifr->ifr_mtu; 249 break; 250 251 case SIOCGIFMTU: 252 ifr->ifr_mtu = sc->ic_if.if_mtu; 253 break; 254 255 case SIOCADDMULTI: 256 case SIOCDELMULTI: 257 if (ifr == 0) { 258 return EAFNOSUPPORT; /* XXX */ 259 } 260 switch (ifr->ifr_addr.sa_family) { 261 262 case AF_INET: 263 break; 264 265 default: 266 return EAFNOSUPPORT; 267 } 268 break; 269 270 default: 271 return EINVAL; 272 } 273 return 0; 274 } 275 276 /* 277 * icintr() 278 */ 279 static void 280 icintr (device_t dev, int event, char *ptr) 281 { 282 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 283 int unit = device_get_unit(dev); 284 int s, len; 285 struct mbuf *top; 286 287 s = splhigh(); 288 289 switch (event) { 290 291 case INTR_GENERAL: 292 case INTR_START: 293 sc->ic_cp = sc->ic_ifbuf; 294 sc->ic_xfercnt = 0; 295 break; 296 297 case INTR_STOP: 298 299 /* if any error occured during transfert, 300 * drop the packet */ 301 if (sc->ic_iferrs) 302 goto err; 303 304 if ((len = sc->ic_xfercnt) == 0) 305 break; /* ignore */ 306 307 if (len <= ICHDRLEN) 308 goto err; 309 310 if (IF_QFULL(&ipintrq)) { 311 IF_DROP(&ipintrq); 312 break; 313 } 314 315 len -= ICHDRLEN; 316 sc->ic_if.if_ipackets ++; 317 sc->ic_if.if_ibytes += len; 318 319 if (sc->ic_if.if_bpf) 320 bpf_tap(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN); 321 322 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0); 323 324 if (top) { 325 IF_ENQUEUE(&ipintrq, top); 326 schednetisr(NETISR_IP); 327 } 328 break; 329 330 err: 331 printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs); 332 333 sc->ic_iferrs = 0; /* reset error count */ 334 sc->ic_if.if_ierrors ++; 335 336 break; 337 338 case INTR_RECEIVE: 339 if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) { 340 sc->ic_iferrs ++; 341 342 } else { 343 *sc->ic_cp++ = *ptr; 344 sc->ic_xfercnt ++; 345 } 346 break; 347 348 case INTR_NOACK: /* xfer terminated by master */ 349 break; 350 351 case INTR_TRANSMIT: 352 *ptr = 0xff; /* XXX */ 353 break; 354 355 case INTR_ERROR: 356 sc->ic_iferrs ++; 357 break; 358 359 default: 360 panic("%s: unknown event (%d)!", __FUNCTION__, event); 361 } 362 363 splx(s); 364 return; 365 } 366 367 /* 368 * icoutput() 369 */ 370 static int 371 icoutput(struct ifnet *ifp, struct mbuf *m, 372 struct sockaddr *dst, struct rtentry *rt) 373 { 374 device_t icdev = devclass_get_device(ic_devclass, ifp->if_unit); 375 device_t parent = device_get_parent(icdev); 376 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 377 378 int s, len, sent; 379 struct mbuf *mm; 380 u_char *cp; 381 u_int hdr = dst->sa_family; 382 383 ifp->if_flags |= IFF_RUNNING; 384 385 s = splhigh(); 386 387 /* already sending? */ 388 if (sc->ic_sending) { 389 ifp->if_oerrors ++; 390 goto error; 391 } 392 393 /* insert header */ 394 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); 395 396 cp = sc->ic_obuf + ICHDRLEN; 397 len = 0; 398 mm = m; 399 do { 400 if (len + mm->m_len > sc->ic_if.if_mtu) { 401 /* packet to large */ 402 ifp->if_oerrors ++; 403 goto error; 404 } 405 406 bcopy(mtod(mm,char *), cp, mm->m_len); 407 cp += mm->m_len; 408 len += mm->m_len; 409 410 } while ((mm = mm->m_next)); 411 412 if (ifp->if_bpf) { 413 struct mbuf m0, *n = m; 414 415 /* 416 * We need to prepend the address family as 417 * a four byte field. Cons up a dummy header 418 * to pacify bpf. This is safe because bpf 419 * will only read from the mbuf (i.e., it won't 420 * try to free it or keep a pointer a to it). 421 */ 422 m0.m_next = m; 423 m0.m_len = sizeof(u_int); 424 m0.m_data = (char *)&hdr; 425 n = &m0; 426 427 bpf_mtap(ifp, n); 428 } 429 430 sc->ic_sending = 1; 431 432 m_freem(m); 433 splx(s); 434 435 /* send the packet */ 436 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 437 len + ICHDRLEN, &sent)) 438 439 ifp->if_oerrors ++; 440 else { 441 ifp->if_opackets ++; 442 ifp->if_obytes += len; 443 } 444 445 sc->ic_sending = 0; 446 447 return (0); 448 449 error: 450 m_freem(m); 451 splx(s); 452 453 return(0); 454 } 455 456 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0); 457