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 1.3 2003/08/07 21:17:02 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 if (IF_QFULL(&ipintrq)) { 312 IF_DROP(&ipintrq); 313 break; 314 } 315 316 len -= ICHDRLEN; 317 sc->ic_if.if_ipackets ++; 318 sc->ic_if.if_ibytes += len; 319 320 if (sc->ic_if.if_bpf) 321 bpf_tap(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN); 322 323 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0); 324 325 if (top) { 326 IF_ENQUEUE(&ipintrq, top); 327 schednetisr(NETISR_IP); 328 } 329 break; 330 331 err: 332 printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs); 333 334 sc->ic_iferrs = 0; /* reset error count */ 335 sc->ic_if.if_ierrors ++; 336 337 break; 338 339 case INTR_RECEIVE: 340 if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) { 341 sc->ic_iferrs ++; 342 343 } else { 344 *sc->ic_cp++ = *ptr; 345 sc->ic_xfercnt ++; 346 } 347 break; 348 349 case INTR_NOACK: /* xfer terminated by master */ 350 break; 351 352 case INTR_TRANSMIT: 353 *ptr = 0xff; /* XXX */ 354 break; 355 356 case INTR_ERROR: 357 sc->ic_iferrs ++; 358 break; 359 360 default: 361 panic("%s: unknown event (%d)!", __FUNCTION__, event); 362 } 363 364 splx(s); 365 return; 366 } 367 368 /* 369 * icoutput() 370 */ 371 static int 372 icoutput(struct ifnet *ifp, struct mbuf *m, 373 struct sockaddr *dst, struct rtentry *rt) 374 { 375 device_t icdev = devclass_get_device(ic_devclass, ifp->if_unit); 376 device_t parent = device_get_parent(icdev); 377 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 378 379 int s, len, sent; 380 struct mbuf *mm; 381 u_char *cp; 382 u_int hdr = dst->sa_family; 383 384 ifp->if_flags |= IFF_RUNNING; 385 386 s = splhigh(); 387 388 /* already sending? */ 389 if (sc->ic_sending) { 390 ifp->if_oerrors ++; 391 goto error; 392 } 393 394 /* insert header */ 395 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); 396 397 cp = sc->ic_obuf + ICHDRLEN; 398 len = 0; 399 mm = m; 400 do { 401 if (len + mm->m_len > sc->ic_if.if_mtu) { 402 /* packet to large */ 403 ifp->if_oerrors ++; 404 goto error; 405 } 406 407 bcopy(mtod(mm,char *), cp, mm->m_len); 408 cp += mm->m_len; 409 len += mm->m_len; 410 411 } while ((mm = mm->m_next)); 412 413 if (ifp->if_bpf) { 414 struct mbuf m0, *n = m; 415 416 /* 417 * We need to prepend the address family as 418 * a four byte field. Cons up a dummy header 419 * to pacify bpf. This is safe because bpf 420 * will only read from the mbuf (i.e., it won't 421 * try to free it or keep a pointer a to it). 422 */ 423 m0.m_next = m; 424 m0.m_len = sizeof(u_int); 425 m0.m_data = (char *)&hdr; 426 n = &m0; 427 428 bpf_mtap(ifp, n); 429 } 430 431 sc->ic_sending = 1; 432 433 m_freem(m); 434 splx(s); 435 436 /* send the packet */ 437 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 438 len + ICHDRLEN, &sent)) 439 440 ifp->if_oerrors ++; 441 else { 442 ifp->if_opackets ++; 443 ifp->if_obytes += len; 444 } 445 446 sc->ic_sending = 0; 447 448 return (0); 449 450 error: 451 m_freem(m); 452 splx(s); 453 454 return(0); 455 } 456 457 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0); 458