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_ifp; 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; 133 134 ifp = sc->ic_ifp = if_alloc(IFT_PARA); 135 if (ifp == NULL) { 136 return (ENOSPC); 137 } 138 139 sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */ 140 141 ifp->if_softc = sc; 142 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 143 ifp->if_mtu = ICMTU; 144 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST | 145 IFF_NEEDSGIANT; 146 ifp->if_ioctl = icioctl; 147 ifp->if_output = icoutput; 148 ifp->if_hdrlen = 0; 149 ifp->if_addrlen = 0; 150 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 151 152 if_attach(ifp); 153 154 bpfattach(ifp, DLT_NULL, ICHDRLEN); 155 156 return (0); 157 } 158 159 /* 160 * iciotcl() 161 */ 162 static int 163 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 164 { 165 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit); 166 device_t parent = device_get_parent(icdev); 167 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 168 169 struct ifaddr *ifa = (struct ifaddr *)data; 170 struct ifreq *ifr = (struct ifreq *)data; 171 172 u_char *iptr, *optr; 173 int error; 174 175 switch (cmd) { 176 177 case SIOCSIFDSTADDR: 178 case SIOCAIFADDR: 179 case SIOCSIFADDR: 180 if (ifa->ifa_addr->sa_family != AF_INET) 181 return EAFNOSUPPORT; 182 ifp->if_flags |= IFF_UP; 183 /* FALLTHROUGH */ 184 case SIOCSIFFLAGS: 185 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 186 187 /* XXX disable PCF */ 188 ifp->if_flags &= ~IFF_RUNNING; 189 190 /* IFF_UP is not set, try to release the bus anyway */ 191 iicbus_release_bus(parent, icdev); 192 break; 193 } 194 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 195 196 if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR))) 197 return (error); 198 199 sc->ic_obuf = malloc(sc->ic_ifp->if_mtu + ICHDRLEN, 200 M_DEVBUF, M_WAITOK); 201 if (!sc->ic_obuf) { 202 iicbus_release_bus(parent, icdev); 203 return ENOBUFS; 204 } 205 206 sc->ic_ifbuf = malloc(sc->ic_ifp->if_mtu + ICHDRLEN, 207 M_DEVBUF, M_WAITOK); 208 if (!sc->ic_ifbuf) { 209 iicbus_release_bus(parent, icdev); 210 return ENOBUFS; 211 } 212 213 iicbus_reset(parent, IIC_FASTEST, 0, NULL); 214 215 ifp->if_flags |= IFF_RUNNING; 216 } 217 break; 218 219 case SIOCSIFMTU: 220 /* save previous buffers */ 221 iptr = sc->ic_ifbuf; 222 optr = sc->ic_obuf; 223 224 /* allocate input buffer */ 225 sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT); 226 if (!sc->ic_ifbuf) { 227 228 sc->ic_ifbuf = iptr; 229 sc->ic_obuf = optr; 230 231 return ENOBUFS; 232 } 233 234 /* allocate output buffer */ 235 sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT); 236 if (!sc->ic_obuf) { 237 238 free(sc->ic_ifbuf,M_DEVBUF); 239 240 sc->ic_ifbuf = iptr; 241 sc->ic_obuf = optr; 242 243 return ENOBUFS; 244 } 245 246 if (iptr) 247 free(iptr,M_DEVBUF); 248 249 if (optr) 250 free(optr,M_DEVBUF); 251 252 sc->ic_ifp->if_mtu = ifr->ifr_mtu; 253 break; 254 255 case SIOCGIFMTU: 256 ifr->ifr_mtu = sc->ic_ifp->if_mtu; 257 break; 258 259 case SIOCADDMULTI: 260 case SIOCDELMULTI: 261 if (ifr == 0) { 262 return EAFNOSUPPORT; /* XXX */ 263 } 264 switch (ifr->ifr_addr.sa_family) { 265 266 case AF_INET: 267 break; 268 269 default: 270 return EAFNOSUPPORT; 271 } 272 break; 273 274 default: 275 return EINVAL; 276 } 277 return 0; 278 } 279 280 /* 281 * icintr() 282 */ 283 static void 284 icintr (device_t dev, int event, char *ptr) 285 { 286 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 287 int unit = device_get_unit(dev); 288 int s, len; 289 struct mbuf *top; 290 291 s = splhigh(); 292 293 switch (event) { 294 295 case INTR_GENERAL: 296 case INTR_START: 297 sc->ic_cp = sc->ic_ifbuf; 298 sc->ic_xfercnt = 0; 299 break; 300 301 case INTR_STOP: 302 303 /* if any error occured during transfert, 304 * drop the packet */ 305 if (sc->ic_iferrs) 306 goto err; 307 308 if ((len = sc->ic_xfercnt) == 0) 309 break; /* ignore */ 310 311 if (len <= ICHDRLEN) 312 goto err; 313 314 len -= ICHDRLEN; 315 sc->ic_ifp->if_ipackets ++; 316 sc->ic_ifp->if_ibytes += len; 317 318 BPF_TAP(sc->ic_ifp, sc->ic_ifbuf, len + ICHDRLEN); 319 320 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, sc->ic_ifp, 0); 321 322 if (top) 323 netisr_dispatch(NETISR_IP, top); 324 break; 325 326 err: 327 printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs); 328 329 sc->ic_iferrs = 0; /* reset error count */ 330 sc->ic_ifp->if_ierrors ++; 331 332 break; 333 334 case INTR_RECEIVE: 335 if (sc->ic_xfercnt >= sc->ic_ifp->if_mtu+ICHDRLEN) { 336 sc->ic_iferrs ++; 337 338 } else { 339 *sc->ic_cp++ = *ptr; 340 sc->ic_xfercnt ++; 341 } 342 break; 343 344 case INTR_NOACK: /* xfer terminated by master */ 345 break; 346 347 case INTR_TRANSMIT: 348 *ptr = 0xff; /* XXX */ 349 break; 350 351 case INTR_ERROR: 352 sc->ic_iferrs ++; 353 break; 354 355 default: 356 panic("%s: unknown event (%d)!", __func__, event); 357 } 358 359 splx(s); 360 return; 361 } 362 363 /* 364 * icoutput() 365 */ 366 static int 367 icoutput(struct ifnet *ifp, struct mbuf *m, 368 struct sockaddr *dst, struct rtentry *rt) 369 { 370 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit); 371 device_t parent = device_get_parent(icdev); 372 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 373 374 int s, len, sent; 375 struct mbuf *mm; 376 u_char *cp; 377 u_int32_t hdr = dst->sa_family; 378 379 ifp->if_flags |= IFF_RUNNING; 380 381 s = splhigh(); 382 383 /* already sending? */ 384 if (sc->ic_sending) { 385 ifp->if_oerrors ++; 386 goto error; 387 } 388 389 /* insert header */ 390 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); 391 392 cp = sc->ic_obuf + ICHDRLEN; 393 len = 0; 394 mm = m; 395 do { 396 if (len + mm->m_len > sc->ic_ifp->if_mtu) { 397 /* packet to large */ 398 ifp->if_oerrors ++; 399 goto error; 400 } 401 402 bcopy(mtod(mm,char *), cp, mm->m_len); 403 cp += mm->m_len; 404 len += mm->m_len; 405 406 } while ((mm = mm->m_next)); 407 408 BPF_MTAP2(ifp, &hdr, sizeof(hdr), m); 409 410 sc->ic_sending = 1; 411 412 m_freem(m); 413 splx(s); 414 415 /* send the packet */ 416 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 417 len + ICHDRLEN, &sent)) 418 419 ifp->if_oerrors ++; 420 else { 421 ifp->if_opackets ++; 422 ifp->if_obytes += len; 423 } 424 425 sc->ic_sending = 0; 426 427 return (0); 428 429 error: 430 m_freem(m); 431 splx(s); 432 433 return(0); 434 } 435 436 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0); 437 MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 438 MODULE_VERSION(ic, 1); 439