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 sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */ 139 140 ifp->if_softc = sc; 141 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 142 ifp->if_mtu = ICMTU; 143 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST | 144 IFF_NEEDSGIANT; 145 ifp->if_ioctl = icioctl; 146 ifp->if_output = icoutput; 147 ifp->if_hdrlen = 0; 148 ifp->if_addrlen = 0; 149 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 150 151 if_attach(ifp); 152 153 bpfattach(ifp, DLT_NULL, ICHDRLEN); 154 155 return (0); 156 } 157 158 /* 159 * iciotcl() 160 */ 161 static int 162 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 163 { 164 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit); 165 device_t parent = device_get_parent(icdev); 166 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 167 168 struct ifaddr *ifa = (struct ifaddr *)data; 169 struct ifreq *ifr = (struct ifreq *)data; 170 171 u_char *iptr, *optr; 172 int error; 173 174 switch (cmd) { 175 176 case SIOCSIFDSTADDR: 177 case SIOCAIFADDR: 178 case SIOCSIFADDR: 179 if (ifa->ifa_addr->sa_family != AF_INET) 180 return (EAFNOSUPPORT); 181 ifp->if_flags |= IFF_UP; 182 /* FALLTHROUGH */ 183 case SIOCSIFFLAGS: 184 if ((!(ifp->if_flags & IFF_UP)) && 185 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 186 187 /* XXX disable PCF */ 188 ifp->if_drv_flags &= ~IFF_DRV_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)) && 195 (!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 196 if ((error = iicbus_request_bus(parent, icdev, 197 IIC_WAIT | IIC_INTR))) 198 return (error); 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 sc->ic_ifbuf = malloc(sc->ic_ifp->if_mtu + ICHDRLEN, 206 M_DEVBUF, M_WAITOK); 207 if (!sc->ic_ifbuf) { 208 iicbus_release_bus(parent, icdev); 209 return (ENOBUFS); 210 } 211 iicbus_reset(parent, IIC_FASTEST, 0, NULL); 212 ifp->if_drv_flags |= IFF_DRV_RUNNING; 213 } 214 break; 215 216 case SIOCSIFMTU: 217 /* save previous buffers */ 218 iptr = sc->ic_ifbuf; 219 optr = sc->ic_obuf; 220 221 /* allocate input buffer */ 222 sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT); 223 if (!sc->ic_ifbuf) { 224 sc->ic_ifbuf = iptr; 225 sc->ic_obuf = optr; 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 free(sc->ic_ifbuf,M_DEVBUF); 233 sc->ic_ifbuf = iptr; 234 sc->ic_obuf = optr; 235 return (ENOBUFS); 236 } 237 238 if (iptr) 239 free(iptr,M_DEVBUF); 240 if (optr) 241 free(optr,M_DEVBUF); 242 sc->ic_ifp->if_mtu = ifr->ifr_mtu; 243 break; 244 245 case SIOCGIFMTU: 246 ifr->ifr_mtu = sc->ic_ifp->if_mtu; 247 break; 248 249 case SIOCADDMULTI: 250 case SIOCDELMULTI: 251 if (ifr == 0) 252 return (EAFNOSUPPORT); /* XXX */ 253 switch (ifr->ifr_addr.sa_family) { 254 case AF_INET: 255 break; 256 default: 257 return (EAFNOSUPPORT); 258 } 259 break; 260 default: 261 return (EINVAL); 262 } 263 return (0); 264 } 265 266 /* 267 * icintr() 268 */ 269 static void 270 icintr(device_t dev, int event, char *ptr) 271 { 272 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 273 int unit = device_get_unit(dev); 274 int s, len; 275 struct mbuf *top; 276 277 s = splhigh(); 278 279 switch (event) { 280 281 case INTR_GENERAL: 282 case INTR_START: 283 sc->ic_cp = sc->ic_ifbuf; 284 sc->ic_xfercnt = 0; 285 break; 286 287 case INTR_STOP: 288 289 /* if any error occured during transfert, 290 * drop the packet */ 291 if (sc->ic_iferrs) 292 goto err; 293 if ((len = sc->ic_xfercnt) == 0) 294 break; /* ignore */ 295 if (len <= ICHDRLEN) 296 goto err; 297 len -= ICHDRLEN; 298 sc->ic_ifp->if_ipackets++; 299 sc->ic_ifp->if_ibytes += len; 300 BPF_TAP(sc->ic_ifp, sc->ic_ifbuf, len + ICHDRLEN); 301 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, sc->ic_ifp, 0); 302 if (top) 303 netisr_dispatch(NETISR_IP, top); 304 break; 305 err: 306 printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs); 307 sc->ic_iferrs = 0; /* reset error count */ 308 sc->ic_ifp->if_ierrors++; 309 break; 310 311 case INTR_RECEIVE: 312 if (sc->ic_xfercnt >= sc->ic_ifp->if_mtu+ICHDRLEN) { 313 sc->ic_iferrs++; 314 } else { 315 *sc->ic_cp++ = *ptr; 316 sc->ic_xfercnt++; 317 } 318 break; 319 320 case INTR_NOACK: /* xfer terminated by master */ 321 break; 322 323 case INTR_TRANSMIT: 324 *ptr = 0xff; /* XXX */ 325 break; 326 327 case INTR_ERROR: 328 sc->ic_iferrs++; 329 break; 330 331 default: 332 panic("%s: unknown event (%d)!", __func__, event); 333 } 334 335 splx(s); 336 return; 337 } 338 339 /* 340 * icoutput() 341 */ 342 static int 343 icoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 344 struct rtentry *rt) 345 { 346 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit); 347 device_t parent = device_get_parent(icdev); 348 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 349 350 int s, len, sent; 351 struct mbuf *mm; 352 u_char *cp; 353 u_int32_t hdr; 354 355 /* BPF writes need to be handled specially. */ 356 if (dst->sa_family == AF_UNSPEC) 357 bcopy(dst->sa_data, &hdr, sizeof(hdr)); 358 else 359 hdr = dst->sa_family; 360 361 ifp->if_drv_flags |= IFF_DRV_RUNNING; 362 363 s = splhigh(); 364 365 /* already sending? */ 366 if (sc->ic_sending) { 367 ifp->if_oerrors++; 368 goto error; 369 } 370 371 /* insert header */ 372 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); 373 374 cp = sc->ic_obuf + ICHDRLEN; 375 len = 0; 376 mm = m; 377 do { 378 if (len + mm->m_len > sc->ic_ifp->if_mtu) { 379 /* packet to large */ 380 ifp->if_oerrors++; 381 goto error; 382 } 383 384 bcopy(mtod(mm,char *), cp, mm->m_len); 385 cp += mm->m_len; 386 len += mm->m_len; 387 388 } while ((mm = mm->m_next)); 389 390 BPF_MTAP2(ifp, &hdr, sizeof(hdr), m); 391 392 sc->ic_sending = 1; 393 394 m_freem(m); 395 splx(s); 396 397 /* send the packet */ 398 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 399 len + ICHDRLEN, &sent)) 400 401 ifp->if_oerrors++; 402 else { 403 ifp->if_opackets++; 404 ifp->if_obytes += len; 405 } 406 407 sc->ic_sending = 0; 408 409 return (0); 410 411 error: 412 m_freem(m); 413 splx(s); 414 415 return(0); 416 } 417 418 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0); 419 MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 420 MODULE_VERSION(ic, 1); 421