1 /*- 2 * Copyright (c) 1998, 2001 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 * $FreeBSD$ 27 */ 28 29 /* 30 * I2C bus IP driver 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/mbuf.h> 36 #include <sys/socket.h> 37 #include <sys/filio.h> 38 #include <sys/sockio.h> 39 #include <sys/kernel.h> 40 #include <sys/module.h> 41 #include <sys/bus.h> 42 #include <sys/time.h> 43 #include <sys/malloc.h> 44 45 #include <net/if.h> 46 #include <net/if_types.h> 47 #include <net/netisr.h> 48 49 #include <sys/mbuf.h> 50 #include <sys/socket.h> 51 #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> 58 59 #include <net/bpf.h> 60 61 #include <dev/iicbus/iiconf.h> 62 #include <dev/iicbus/iicbus.h> 63 64 #include "iicbus_if.h" 65 66 #define PCF_MASTER_ADDRESS 0xaa 67 68 #define ICHDRLEN sizeof(u_int) 69 #define ICMTU 1500 /* default mtu */ 70 71 struct ic_softc { 72 struct ifnet ic_if; 73 74 u_char ic_addr; /* peer I2C address */ 75 76 int ic_sending; 77 78 char *ic_obuf; 79 char *ic_ifbuf; 80 char *ic_cp; 81 82 int ic_xfercnt; 83 84 int ic_iferrs; 85 }; 86 87 static devclass_t ic_devclass; 88 89 static int icprobe(device_t); 90 static int icattach(device_t); 91 92 static int icioctl(struct ifnet *, u_long, caddr_t); 93 static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 94 struct rtentry *); 95 96 static void icintr(device_t, int, char *); 97 98 static device_method_t ic_methods[] = { 99 /* device interface */ 100 DEVMETHOD(device_probe, icprobe), 101 DEVMETHOD(device_attach, icattach), 102 103 /* iicbus interface */ 104 DEVMETHOD(iicbus_intr, icintr), 105 106 { 0, 0 } 107 }; 108 109 static driver_t ic_driver = { 110 "ic", 111 ic_methods, 112 sizeof(struct ic_softc), 113 }; 114 115 /* 116 * icprobe() 117 */ 118 static int 119 icprobe(device_t dev) 120 { 121 return (0); 122 } 123 124 /* 125 * icattach() 126 */ 127 static int 128 icattach(device_t dev) 129 { 130 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 131 struct ifnet *ifp = &sc->ic_if; 132 133 sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */ 134 135 ifp->if_softc = sc; 136 ifp->if_name = "ic"; 137 ifp->if_unit = device_get_unit(dev); 138 ifp->if_mtu = ICMTU; 139 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 140 ifp->if_ioctl = icioctl; 141 ifp->if_output = icoutput; 142 ifp->if_type = IFT_PARA; 143 ifp->if_hdrlen = 0; 144 ifp->if_addrlen = 0; 145 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 146 147 if_attach(ifp); 148 149 bpfattach(ifp, DLT_NULL, ICHDRLEN); 150 151 return (0); 152 } 153 154 /* 155 * iciotcl() 156 */ 157 static int 158 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 159 { 160 device_t icdev = devclass_get_device(ic_devclass, ifp->if_unit); 161 device_t parent = device_get_parent(icdev); 162 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 163 164 struct ifaddr *ifa = (struct ifaddr *)data; 165 struct ifreq *ifr = (struct ifreq *)data; 166 167 u_char *iptr, *optr; 168 int error; 169 170 switch (cmd) { 171 172 case SIOCSIFDSTADDR: 173 case SIOCAIFADDR: 174 case SIOCSIFADDR: 175 if (ifa->ifa_addr->sa_family != AF_INET) 176 return EAFNOSUPPORT; 177 ifp->if_flags |= IFF_UP; 178 /* FALLTHROUGH */ 179 case SIOCSIFFLAGS: 180 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 181 182 /* XXX disable PCF */ 183 ifp->if_flags &= ~IFF_RUNNING; 184 185 /* IFF_UP is not set, try to release the bus anyway */ 186 iicbus_release_bus(parent, icdev); 187 break; 188 } 189 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 190 191 if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR))) 192 return (error); 193 194 sc->ic_obuf = malloc(sc->ic_if.if_mtu + ICHDRLEN, 195 M_DEVBUF, M_WAITOK); 196 if (!sc->ic_obuf) { 197 iicbus_release_bus(parent, icdev); 198 return ENOBUFS; 199 } 200 201 sc->ic_ifbuf = malloc(sc->ic_if.if_mtu + ICHDRLEN, 202 M_DEVBUF, M_WAITOK); 203 if (!sc->ic_ifbuf) { 204 iicbus_release_bus(parent, icdev); 205 return ENOBUFS; 206 } 207 208 iicbus_reset(parent, IIC_FASTEST, 0, NULL); 209 210 ifp->if_flags |= IFF_RUNNING; 211 } 212 break; 213 214 case SIOCSIFMTU: 215 /* save previous buffers */ 216 iptr = sc->ic_ifbuf; 217 optr = sc->ic_obuf; 218 219 /* allocate input buffer */ 220 sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT); 221 if (!sc->ic_ifbuf) { 222 223 sc->ic_ifbuf = iptr; 224 sc->ic_obuf = optr; 225 226 return ENOBUFS; 227 } 228 229 /* allocate output buffer */ 230 sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT); 231 if (!sc->ic_obuf) { 232 233 free(sc->ic_ifbuf,M_DEVBUF); 234 235 sc->ic_ifbuf = iptr; 236 sc->ic_obuf = optr; 237 238 return ENOBUFS; 239 } 240 241 if (iptr) 242 free(iptr,M_DEVBUF); 243 244 if (optr) 245 free(optr,M_DEVBUF); 246 247 sc->ic_if.if_mtu = ifr->ifr_mtu; 248 break; 249 250 case SIOCGIFMTU: 251 ifr->ifr_mtu = sc->ic_if.if_mtu; 252 break; 253 254 case SIOCADDMULTI: 255 case SIOCDELMULTI: 256 if (ifr == 0) { 257 return EAFNOSUPPORT; /* XXX */ 258 } 259 switch (ifr->ifr_addr.sa_family) { 260 261 case AF_INET: 262 break; 263 264 default: 265 return EAFNOSUPPORT; 266 } 267 break; 268 269 default: 270 return EINVAL; 271 } 272 return 0; 273 } 274 275 /* 276 * icintr() 277 */ 278 static void 279 icintr (device_t dev, int event, char *ptr) 280 { 281 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 282 int unit = device_get_unit(dev); 283 int s, len; 284 struct mbuf *top; 285 286 s = splhigh(); 287 288 switch (event) { 289 290 case INTR_GENERAL: 291 case INTR_START: 292 sc->ic_cp = sc->ic_ifbuf; 293 sc->ic_xfercnt = 0; 294 break; 295 296 case INTR_STOP: 297 298 /* if any error occured during transfert, 299 * drop the packet */ 300 if (sc->ic_iferrs) 301 goto err; 302 303 if ((len = sc->ic_xfercnt) == 0) 304 break; /* ignore */ 305 306 if (len <= ICHDRLEN) 307 goto err; 308 309 len -= ICHDRLEN; 310 sc->ic_if.if_ipackets ++; 311 sc->ic_if.if_ibytes += len; 312 313 BPF_TAP(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN); 314 315 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0); 316 317 if (top) { 318 if (IF_HANDOFF(&ipintrq, top, NULL)) 319 schednetisr(NETISR_IP); 320 } 321 break; 322 323 err: 324 printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs); 325 326 sc->ic_iferrs = 0; /* reset error count */ 327 sc->ic_if.if_ierrors ++; 328 329 break; 330 331 case INTR_RECEIVE: 332 if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) { 333 sc->ic_iferrs ++; 334 335 } else { 336 *sc->ic_cp++ = *ptr; 337 sc->ic_xfercnt ++; 338 } 339 break; 340 341 case INTR_NOACK: /* xfer terminated by master */ 342 break; 343 344 case INTR_TRANSMIT: 345 *ptr = 0xff; /* XXX */ 346 break; 347 348 case INTR_ERROR: 349 sc->ic_iferrs ++; 350 break; 351 352 default: 353 panic("%s: unknown event (%d)!", __func__, event); 354 } 355 356 splx(s); 357 return; 358 } 359 360 /* 361 * icoutput() 362 */ 363 static int 364 icoutput(struct ifnet *ifp, struct mbuf *m, 365 struct sockaddr *dst, struct rtentry *rt) 366 { 367 device_t icdev = devclass_get_device(ic_devclass, ifp->if_unit); 368 device_t parent = device_get_parent(icdev); 369 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 370 371 int s, len, sent; 372 struct mbuf *mm; 373 u_char *cp; 374 u_int hdr = dst->sa_family; 375 376 ifp->if_flags |= IFF_RUNNING; 377 378 s = splhigh(); 379 380 /* already sending? */ 381 if (sc->ic_sending) { 382 ifp->if_oerrors ++; 383 goto error; 384 } 385 386 /* insert header */ 387 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); 388 389 cp = sc->ic_obuf + ICHDRLEN; 390 len = 0; 391 mm = m; 392 do { 393 if (len + mm->m_len > sc->ic_if.if_mtu) { 394 /* packet to large */ 395 ifp->if_oerrors ++; 396 goto error; 397 } 398 399 bcopy(mtod(mm,char *), cp, mm->m_len); 400 cp += mm->m_len; 401 len += mm->m_len; 402 403 } while ((mm = mm->m_next)); 404 405 if (ifp->if_bpf) { 406 struct mbuf m0, *n = m; 407 408 /* 409 * We need to prepend the address family as 410 * a four byte field. Cons up a dummy header 411 * to pacify bpf. This is safe because bpf 412 * will only read from the mbuf (i.e., it won't 413 * try to free it or keep a pointer a to it). 414 */ 415 m0.m_next = m; 416 m0.m_len = sizeof(u_int); 417 m0.m_data = (char *)&hdr; 418 n = &m0; 419 420 BPF_MTAP(ifp, n); 421 } 422 423 sc->ic_sending = 1; 424 425 m_freem(m); 426 splx(s); 427 428 /* send the packet */ 429 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 430 len + ICHDRLEN, &sent)) 431 432 ifp->if_oerrors ++; 433 else { 434 ifp->if_opackets ++; 435 ifp->if_obytes += len; 436 } 437 438 sc->ic_sending = 0; 439 440 return (0); 441 442 error: 443 m_freem(m); 444 splx(s); 445 446 return(0); 447 } 448 449 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0); 450 MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 451 MODULE_VERSION(ic, 1); 452