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)) && 186 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 187 188 /* XXX disable PCF */ 189 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 190 191 /* IFF_UP is not set, try to release the bus anyway */ 192 iicbus_release_bus(parent, icdev); 193 break; 194 } 195 if (((ifp->if_flags & IFF_UP)) && 196 (!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 197 198 if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR))) 199 return (error); 200 201 sc->ic_obuf = malloc(sc->ic_ifp->if_mtu + ICHDRLEN, 202 M_DEVBUF, M_WAITOK); 203 if (!sc->ic_obuf) { 204 iicbus_release_bus(parent, icdev); 205 return ENOBUFS; 206 } 207 208 sc->ic_ifbuf = malloc(sc->ic_ifp->if_mtu + ICHDRLEN, 209 M_DEVBUF, M_WAITOK); 210 if (!sc->ic_ifbuf) { 211 iicbus_release_bus(parent, icdev); 212 return ENOBUFS; 213 } 214 215 iicbus_reset(parent, IIC_FASTEST, 0, NULL); 216 217 ifp->if_drv_flags |= IFF_DRV_RUNNING; 218 } 219 break; 220 221 case SIOCSIFMTU: 222 /* save previous buffers */ 223 iptr = sc->ic_ifbuf; 224 optr = sc->ic_obuf; 225 226 /* allocate input buffer */ 227 sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT); 228 if (!sc->ic_ifbuf) { 229 230 sc->ic_ifbuf = iptr; 231 sc->ic_obuf = optr; 232 233 return ENOBUFS; 234 } 235 236 /* allocate output buffer */ 237 sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT); 238 if (!sc->ic_obuf) { 239 240 free(sc->ic_ifbuf,M_DEVBUF); 241 242 sc->ic_ifbuf = iptr; 243 sc->ic_obuf = optr; 244 245 return ENOBUFS; 246 } 247 248 if (iptr) 249 free(iptr,M_DEVBUF); 250 251 if (optr) 252 free(optr,M_DEVBUF); 253 254 sc->ic_ifp->if_mtu = ifr->ifr_mtu; 255 break; 256 257 case SIOCGIFMTU: 258 ifr->ifr_mtu = sc->ic_ifp->if_mtu; 259 break; 260 261 case SIOCADDMULTI: 262 case SIOCDELMULTI: 263 if (ifr == 0) { 264 return EAFNOSUPPORT; /* XXX */ 265 } 266 switch (ifr->ifr_addr.sa_family) { 267 268 case AF_INET: 269 break; 270 271 default: 272 return EAFNOSUPPORT; 273 } 274 break; 275 276 default: 277 return EINVAL; 278 } 279 return 0; 280 } 281 282 /* 283 * icintr() 284 */ 285 static void 286 icintr (device_t dev, int event, char *ptr) 287 { 288 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 289 int unit = device_get_unit(dev); 290 int s, len; 291 struct mbuf *top; 292 293 s = splhigh(); 294 295 switch (event) { 296 297 case INTR_GENERAL: 298 case INTR_START: 299 sc->ic_cp = sc->ic_ifbuf; 300 sc->ic_xfercnt = 0; 301 break; 302 303 case INTR_STOP: 304 305 /* if any error occured during transfert, 306 * drop the packet */ 307 if (sc->ic_iferrs) 308 goto err; 309 310 if ((len = sc->ic_xfercnt) == 0) 311 break; /* ignore */ 312 313 if (len <= ICHDRLEN) 314 goto err; 315 316 len -= ICHDRLEN; 317 sc->ic_ifp->if_ipackets ++; 318 sc->ic_ifp->if_ibytes += len; 319 320 BPF_TAP(sc->ic_ifp, sc->ic_ifbuf, len + ICHDRLEN); 321 322 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, sc->ic_ifp, 0); 323 324 if (top) 325 netisr_dispatch(NETISR_IP, top); 326 break; 327 328 err: 329 printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs); 330 331 sc->ic_iferrs = 0; /* reset error count */ 332 sc->ic_ifp->if_ierrors ++; 333 334 break; 335 336 case INTR_RECEIVE: 337 if (sc->ic_xfercnt >= sc->ic_ifp->if_mtu+ICHDRLEN) { 338 sc->ic_iferrs ++; 339 340 } else { 341 *sc->ic_cp++ = *ptr; 342 sc->ic_xfercnt ++; 343 } 344 break; 345 346 case INTR_NOACK: /* xfer terminated by master */ 347 break; 348 349 case INTR_TRANSMIT: 350 *ptr = 0xff; /* XXX */ 351 break; 352 353 case INTR_ERROR: 354 sc->ic_iferrs ++; 355 break; 356 357 default: 358 panic("%s: unknown event (%d)!", __func__, event); 359 } 360 361 splx(s); 362 return; 363 } 364 365 /* 366 * icoutput() 367 */ 368 static int 369 icoutput(struct ifnet *ifp, struct mbuf *m, 370 struct sockaddr *dst, struct rtentry *rt) 371 { 372 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit); 373 device_t parent = device_get_parent(icdev); 374 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 375 376 int s, len, sent; 377 struct mbuf *mm; 378 u_char *cp; 379 u_int32_t hdr; 380 381 /* BPF writes need to be handled specially. */ 382 if (dst->sa_family == AF_UNSPEC) 383 bcopy(dst->sa_data, &hdr, sizeof(hdr)); 384 else 385 hdr = dst->sa_family; 386 387 ifp->if_drv_flags |= IFF_DRV_RUNNING; 388 389 s = splhigh(); 390 391 /* already sending? */ 392 if (sc->ic_sending) { 393 ifp->if_oerrors ++; 394 goto error; 395 } 396 397 /* insert header */ 398 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); 399 400 cp = sc->ic_obuf + ICHDRLEN; 401 len = 0; 402 mm = m; 403 do { 404 if (len + mm->m_len > sc->ic_ifp->if_mtu) { 405 /* packet to large */ 406 ifp->if_oerrors ++; 407 goto error; 408 } 409 410 bcopy(mtod(mm,char *), cp, mm->m_len); 411 cp += mm->m_len; 412 len += mm->m_len; 413 414 } while ((mm = mm->m_next)); 415 416 BPF_MTAP2(ifp, &hdr, sizeof(hdr), m); 417 418 sc->ic_sending = 1; 419 420 m_freem(m); 421 splx(s); 422 423 /* send the packet */ 424 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 425 len + ICHDRLEN, &sent)) 426 427 ifp->if_oerrors ++; 428 else { 429 ifp->if_opackets ++; 430 ifp->if_obytes += len; 431 } 432 433 sc->ic_sending = 0; 434 435 return (0); 436 437 error: 438 m_freem(m); 439 splx(s); 440 441 return(0); 442 } 443 444 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0); 445 MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 446 MODULE_VERSION(ic, 1); 447