if_ic.c revision 111888
1249261Sdim/*- 2249261Sdim * Copyright (c) 1998, 2001 Nicolas Souchu 3249261Sdim * All rights reserved. 4249261Sdim * 5249261Sdim * Redistribution and use in source and binary forms, with or without 6249261Sdim * modification, are permitted provided that the following conditions 7249261Sdim * are met: 8249261Sdim * 1. Redistributions of source code must retain the above copyright 9249261Sdim * notice, this list of conditions and the following disclaimer. 10249261Sdim * 2. Redistributions in binary form must reproduce the above copyright 11249261Sdim * notice, this list of conditions and the following disclaimer in the 12249261Sdim * documentation and/or other materials provided with the distribution. 13249261Sdim * 14249261Sdim * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15249261Sdim * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16249261Sdim * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17249261Sdim * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18249261Sdim * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19249261Sdim * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20249261Sdim * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21249261Sdim * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22249261Sdim * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23249261Sdim * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24249261Sdim * SUCH DAMAGE. 25249261Sdim * 26249261Sdim * $FreeBSD: head/sys/dev/iicbus/if_ic.c 111888 2003-03-04 23:19:55Z jlemon $ 27249261Sdim */ 28249261Sdim 29249261Sdim/* 30249261Sdim * I2C bus IP driver 31249261Sdim */ 32249261Sdim 33249261Sdim#include <sys/param.h> 34249261Sdim#include <sys/systm.h> 35249261Sdim#include <sys/mbuf.h> 36249261Sdim#include <sys/socket.h> 37249261Sdim#include <sys/filio.h> 38249261Sdim#include <sys/sockio.h> 39249261Sdim#include <sys/kernel.h> 40249261Sdim#include <sys/module.h> 41249261Sdim#include <sys/bus.h> 42249261Sdim#include <sys/time.h> 43249261Sdim#include <sys/malloc.h> 44249261Sdim 45249261Sdim#include <net/if.h> 46249261Sdim#include <net/if_types.h> 47249261Sdim#include <net/netisr.h> 48249261Sdim 49249261Sdim#include <sys/mbuf.h> 50249261Sdim#include <sys/socket.h> 51249261Sdim#include <net/netisr.h> 52249261Sdim#include <net/route.h> 53249261Sdim#include <netinet/in.h> 54249261Sdim#include <netinet/in_systm.h> 55249261Sdim#include <netinet/in_var.h> 56249261Sdim#include <netinet/ip.h> 57249261Sdim#include <netinet/if_ether.h> 58249261Sdim 59249261Sdim#include <net/bpf.h> 60249261Sdim 61249261Sdim#include <dev/iicbus/iiconf.h> 62249261Sdim#include <dev/iicbus/iicbus.h> 63249261Sdim 64249261Sdim#include "iicbus_if.h" 65249261Sdim 66249261Sdim#define PCF_MASTER_ADDRESS 0xaa 67249261Sdim 68249261Sdim#define ICHDRLEN sizeof(u_int) 69249261Sdim#define ICMTU 1500 /* default mtu */ 70249261Sdim 71249261Sdimstruct ic_softc { 72249261Sdim struct ifnet ic_if; 73249261Sdim 74249261Sdim u_char ic_addr; /* peer I2C address */ 75249261Sdim 76249261Sdim int ic_sending; 77249261Sdim 78249261Sdim char *ic_obuf; 79249261Sdim char *ic_ifbuf; 80249261Sdim char *ic_cp; 81249261Sdim 82249261Sdim int ic_xfercnt; 83249261Sdim 84249261Sdim int ic_iferrs; 85249261Sdim}; 86249261Sdim 87249261Sdimstatic devclass_t ic_devclass; 88249261Sdim 89249261Sdimstatic int icprobe(device_t); 90249261Sdimstatic int icattach(device_t); 91249261Sdim 92249261Sdimstatic int icioctl(struct ifnet *, u_long, caddr_t); 93249261Sdimstatic int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 94249261Sdim struct rtentry *); 95249261Sdim 96249261Sdimstatic void icintr(device_t, int, char *); 97249261Sdim 98249261Sdimstatic device_method_t ic_methods[] = { 99249261Sdim /* device interface */ 100249261Sdim DEVMETHOD(device_probe, icprobe), 101249261Sdim DEVMETHOD(device_attach, icattach), 102249261Sdim 103249261Sdim /* iicbus interface */ 104249261Sdim DEVMETHOD(iicbus_intr, icintr), 105249261Sdim 106249261Sdim { 0, 0 } 107249261Sdim}; 108249261Sdim 109249261Sdimstatic driver_t ic_driver = { 110249261Sdim "ic", 111249261Sdim ic_methods, 112249261Sdim sizeof(struct ic_softc), 113249261Sdim}; 114249261Sdim 115249261Sdim/* 116249261Sdim * icprobe() 117249261Sdim */ 118249261Sdimstatic int 119249261Sdimicprobe(device_t dev) 120249261Sdim{ 121249261Sdim return (0); 122249261Sdim} 123249261Sdim 124249261Sdim/* 125249261Sdim * icattach() 126249261Sdim */ 127249261Sdimstatic int 128249261Sdimicattach(device_t dev) 129249261Sdim{ 130249261Sdim struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 131249261Sdim struct ifnet *ifp = &sc->ic_if; 132249261Sdim 133249261Sdim sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */ 134249261Sdim 135249261Sdim ifp->if_softc = sc; 136249261Sdim ifp->if_name = "ic"; 137249261Sdim ifp->if_unit = device_get_unit(dev); 138249261Sdim ifp->if_mtu = ICMTU; 139249261Sdim ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 140249261Sdim ifp->if_ioctl = icioctl; 141249261Sdim ifp->if_output = icoutput; 142249261Sdim ifp->if_type = IFT_PARA; 143249261Sdim ifp->if_hdrlen = 0; 144249261Sdim ifp->if_addrlen = 0; 145249261Sdim ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 146249261Sdim 147249261Sdim if_attach(ifp); 148249261Sdim 149249261Sdim bpfattach(ifp, DLT_NULL, ICHDRLEN); 150249261Sdim 151249261Sdim return (0); 152249261Sdim} 153249261Sdim 154249261Sdim/* 155249261Sdim * iciotcl() 156249261Sdim */ 157249261Sdimstatic int 158249261Sdimicioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 159249261Sdim{ 160249261Sdim device_t icdev = devclass_get_device(ic_devclass, ifp->if_unit); 161249261Sdim device_t parent = device_get_parent(icdev); 162249261Sdim struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 163249261Sdim 164249261Sdim struct ifaddr *ifa = (struct ifaddr *)data; 165249261Sdim struct ifreq *ifr = (struct ifreq *)data; 166249261Sdim 167249261Sdim u_char *iptr, *optr; 168249261Sdim int error; 169249261Sdim 170249261Sdim switch (cmd) { 171249261Sdim 172249261Sdim case SIOCSIFDSTADDR: 173249261Sdim case SIOCAIFADDR: 174249261Sdim case SIOCSIFADDR: 175249261Sdim if (ifa->ifa_addr->sa_family != AF_INET) 176249261Sdim return EAFNOSUPPORT; 177249261Sdim ifp->if_flags |= IFF_UP; 178249261Sdim /* FALLTHROUGH */ 179249261Sdim case SIOCSIFFLAGS: 180249261Sdim if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 181249261Sdim 182249261Sdim /* XXX disable PCF */ 183249261Sdim ifp->if_flags &= ~IFF_RUNNING; 184249261Sdim 185249261Sdim /* IFF_UP is not set, try to release the bus anyway */ 186249261Sdim iicbus_release_bus(parent, icdev); 187249261Sdim break; 188249261Sdim } 189249261Sdim if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 190249261Sdim 191249261Sdim if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR))) 192249261Sdim return (error); 193249261Sdim 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 */ 278static void 279icintr (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 */ 361static int 362icoutput(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_unit); 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_int 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 if (ifp->if_bpf) { 404 struct mbuf m0, *n = m; 405 406 /* 407 * We need to prepend the address family as 408 * a four byte field. Cons up a dummy header 409 * to pacify bpf. This is safe because bpf 410 * will only read from the mbuf (i.e., it won't 411 * try to free it or keep a pointer a to it). 412 */ 413 m0.m_next = m; 414 m0.m_len = sizeof(u_int); 415 m0.m_data = (char *)&hdr; 416 n = &m0; 417 418 BPF_MTAP(ifp, n); 419 } 420 421 sc->ic_sending = 1; 422 423 m_freem(m); 424 splx(s); 425 426 /* send the packet */ 427 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 428 len + ICHDRLEN, &sent)) 429 430 ifp->if_oerrors ++; 431 else { 432 ifp->if_opackets ++; 433 ifp->if_obytes += len; 434 } 435 436 sc->ic_sending = 0; 437 438 return (0); 439 440error: 441 m_freem(m); 442 splx(s); 443 444 return(0); 445} 446 447DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0); 448MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 449MODULE_VERSION(ic, 1); 450