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 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 /* 31 * I2C bus IP driver 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/mbuf.h> 37 #include <sys/socket.h> 38 #include <sys/filio.h> 39 #include <sys/sockio.h> 40 #include <sys/kernel.h> 41 #include <sys/module.h> 42 #include <sys/bus.h> 43 #include <sys/time.h> 44 #include <sys/malloc.h> 45 46 #include <net/if.h> 47 #include <net/if_types.h> 48 #include <net/netisr.h> 49 50 #include <sys/mbuf.h> 51 #include <sys/socket.h> 52 #include <net/netisr.h> 53 #include <net/route.h> 54 #include <netinet/in.h> 55 #include <netinet/in_systm.h> 56 #include <netinet/in_var.h> 57 #include <netinet/ip.h> 58 #include <netinet/if_ether.h> 59 60 #include <net/bpf.h> 61 62 #include <dev/iicbus/iiconf.h> 63 #include <dev/iicbus/iicbus.h> 64 65 #include "iicbus_if.h" 66 67 #define PCF_MASTER_ADDRESS 0xaa 68 69 #define ICHDRLEN sizeof(u_int32_t) 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 = PCF_MASTER_ADDRESS; /* XXX only PCF masters */ 135 136 ifp->if_softc = sc; 137 if_initname(ifp, device_get_name(dev), 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_dunit); 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 netisr_dispatch(NETISR_IP, top); 319 break; 320 321 err: 322 printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs); 323 324 sc->ic_iferrs = 0; /* reset error count */ 325 sc->ic_if.if_ierrors ++; 326 327 break; 328 329 case INTR_RECEIVE: 330 if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) { 331 sc->ic_iferrs ++; 332 333 } else { 334 *sc->ic_cp++ = *ptr; 335 sc->ic_xfercnt ++; 336 } 337 break; 338 339 case INTR_NOACK: /* xfer terminated by master */ 340 break; 341 342 case INTR_TRANSMIT: 343 *ptr = 0xff; /* XXX */ 344 break; 345 346 case INTR_ERROR: 347 sc->ic_iferrs ++; 348 break; 349 350 default: 351 panic("%s: unknown event (%d)!", __func__, event); 352 } 353 354 splx(s); 355 return; 356 } 357 358 /* 359 * icoutput() 360 */ 361 static int 362 icoutput(struct ifnet *ifp, struct mbuf *m, 363 struct sockaddr *dst, struct rtentry *rt) 364 { 365 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit); 366 device_t parent = device_get_parent(icdev); 367 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 368 369 int s, len, sent; 370 struct mbuf *mm; 371 u_char *cp; 372 u_int32_t hdr = dst->sa_family; 373 374 ifp->if_flags |= IFF_RUNNING; 375 376 s = splhigh(); 377 378 /* already sending? */ 379 if (sc->ic_sending) { 380 ifp->if_oerrors ++; 381 goto error; 382 } 383 384 /* insert header */ 385 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); 386 387 cp = sc->ic_obuf + ICHDRLEN; 388 len = 0; 389 mm = m; 390 do { 391 if (len + mm->m_len > sc->ic_if.if_mtu) { 392 /* packet to large */ 393 ifp->if_oerrors ++; 394 goto error; 395 } 396 397 bcopy(mtod(mm,char *), cp, mm->m_len); 398 cp += mm->m_len; 399 len += mm->m_len; 400 401 } while ((mm = mm->m_next)); 402 403 BPF_MTAP2(ifp, &hdr, sizeof(hdr), m); 404 405 sc->ic_sending = 1; 406 407 m_freem(m); 408 splx(s); 409 410 /* send the packet */ 411 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 412 len + ICHDRLEN, &sent)) 413 414 ifp->if_oerrors ++; 415 else { 416 ifp->if_opackets ++; 417 ifp->if_obytes += len; 418 } 419 420 sc->ic_sending = 0; 421 422 return (0); 423 424 error: 425 m_freem(m); 426 splx(s); 427 428 return(0); 429 } 430 431 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0); 432 MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 433 MODULE_VERSION(ic, 1); 434