1 /*- 2 * Copyright (c) 1998 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 * $FreeBSD: src/sys/dev/iicbus/if_ic.c,v 1.8 1999/12/29 04:35:39 peter Exp $ 27 */ 28 29 /* 30 * I2C bus IP driver 31 */ 32 33 #include <sys/param.h> 34 #include <sys/systm.h> 35 #include <sys/proc.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 #include <sys/thread2.h> 46 47 #include <net/if.h> 48 #include <net/ifq_var.h> 49 #include <net/if_types.h> 50 #include <net/netisr.h> 51 52 #include <net/route.h> 53 #include <netinet/in.h> 54 #include <netinet/in_systm.h> 55 #include <netinet/in_var.h> 56 #include <netinet/ip.h> 57 #include <netinet/if_ether.h> 58 59 #include <net/bpf.h> 60 61 #include <bus/iicbus/iiconf.h> 62 #include <bus/iicbus/iicbus.h> 63 64 #include "iicbus_if.h" 65 66 #define PCF_MASTER_ADDRESS 0xaa 67 68 #define ICHDRLEN sizeof(uint32_t) 69 #define ICMTU 1500 /* default mtu */ 70 71 struct ic_softc { 72 struct ifnet ic_if; 73 74 u_char ic_addr; /* peer I2C address */ 75 76 int ic_sending; 77 78 char *ic_obuf; 79 char *ic_ifbuf; 80 char *ic_cp; 81 82 int ic_xfercnt; 83 84 int ic_iferrs; 85 }; 86 87 static devclass_t ic_devclass; 88 89 static int icprobe(device_t); 90 static int icattach(device_t); 91 92 static int icioctl(struct ifnet *, u_long, caddr_t, struct ucred *); 93 static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 94 struct rtentry *); 95 96 static void icintr(device_t, int, char *); 97 98 static device_method_t ic_methods[] = { 99 /* device interface */ 100 DEVMETHOD(device_probe, icprobe), 101 DEVMETHOD(device_attach, icattach), 102 103 /* iicbus interface */ 104 DEVMETHOD(iicbus_intr, icintr), 105 106 DEVMETHOD_END 107 }; 108 109 static driver_t ic_driver = { 110 "ic", 111 ic_methods, 112 sizeof(struct ic_softc), 113 }; 114 115 /* 116 * icprobe() 117 */ 118 static int 119 icprobe(device_t dev) 120 { 121 return (0); 122 } 123 124 /* 125 * icattach() 126 */ 127 static int 128 icattach(device_t dev) 129 { 130 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 131 struct ifnet *ifp = &sc->ic_if; 132 133 sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */ 134 135 ifp->if_softc = sc; 136 if_initname(ifp, "ic", device_get_unit(dev)); 137 ifp->if_mtu = ICMTU; 138 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 139 ifp->if_ioctl = icioctl; 140 ifp->if_output = icoutput; 141 ifp->if_type = IFT_PARA; 142 ifp->if_hdrlen = 0; 143 ifp->if_addrlen = 0; 144 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN); 145 146 if_attach(ifp, NULL); 147 148 bpfattach(ifp, DLT_NULL, ICHDRLEN); 149 150 return (0); 151 } 152 153 /* 154 * iciotcl() 155 */ 156 static int 157 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr) 158 { 159 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit); 160 device_t parent = device_get_parent(icdev); 161 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 162 163 struct ifaddr *ifa = (struct ifaddr *)data; 164 struct ifreq *ifr = (struct ifreq *)data; 165 166 u_char *iptr, *optr; 167 int error; 168 169 switch (cmd) { 170 171 case SIOCSIFDSTADDR: 172 case SIOCAIFADDR: 173 case SIOCSIFADDR: 174 if (ifa->ifa_addr->sa_family != AF_INET) 175 return EAFNOSUPPORT; 176 ifp->if_flags |= IFF_UP; 177 /* FALLTHROUGH */ 178 case SIOCSIFFLAGS: 179 if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) { 180 181 /* XXX disable PCF */ 182 ifp->if_flags &= ~IFF_RUNNING; 183 184 /* IFF_UP is not set, try to release the bus anyway */ 185 iicbus_release_bus(parent, icdev); 186 break; 187 } 188 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 189 190 if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR))) 191 return (error); 192 193 sc->ic_obuf = kmalloc(sc->ic_if.if_mtu + ICHDRLEN, 194 M_DEVBUF, M_WAITOK); 195 196 sc->ic_ifbuf = kmalloc(sc->ic_if.if_mtu + ICHDRLEN, 197 M_DEVBUF, M_WAITOK); 198 199 iicbus_reset(parent, IIC_FASTEST, 0, NULL); 200 201 ifp->if_flags |= IFF_RUNNING; 202 } 203 break; 204 205 case SIOCSIFMTU: 206 /* save previous buffers */ 207 iptr = sc->ic_ifbuf; 208 optr = sc->ic_obuf; 209 210 /* allocate input buffer */ 211 sc->ic_ifbuf = kmalloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK); 212 213 /* allocate output buffer */ 214 sc->ic_obuf = kmalloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK); 215 216 if (iptr) 217 kfree(iptr,M_DEVBUF); 218 219 if (optr) 220 kfree(optr,M_DEVBUF); 221 222 sc->ic_if.if_mtu = ifr->ifr_mtu; 223 break; 224 225 case SIOCGIFMTU: 226 ifr->ifr_mtu = sc->ic_if.if_mtu; 227 break; 228 229 case SIOCADDMULTI: 230 case SIOCDELMULTI: 231 if (ifr == NULL) { 232 return EAFNOSUPPORT; /* XXX */ 233 } 234 switch (ifr->ifr_addr.sa_family) { 235 236 case AF_INET: 237 break; 238 239 default: 240 return EAFNOSUPPORT; 241 } 242 break; 243 244 default: 245 return EINVAL; 246 } 247 return 0; 248 } 249 250 /* 251 * icintr() 252 */ 253 static void 254 icintr (device_t dev, int event, char *ptr) 255 { 256 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 257 int unit = device_get_unit(dev); 258 int len; 259 struct mbuf *top; 260 261 crit_enter(); 262 263 switch (event) { 264 265 case INTR_GENERAL: 266 case INTR_START: 267 sc->ic_cp = sc->ic_ifbuf; 268 sc->ic_xfercnt = 0; 269 break; 270 271 case INTR_STOP: 272 273 /* if any error occured during transfert, 274 * drop the packet */ 275 if (sc->ic_iferrs) 276 goto err; 277 278 if ((len = sc->ic_xfercnt) == 0) 279 break; /* ignore */ 280 281 if (len <= ICHDRLEN) 282 goto err; 283 284 len -= ICHDRLEN; 285 IFNET_STAT_INC(&sc->ic_if, ipackets, 1); 286 IFNET_STAT_INC(&sc->ic_if, ibytes, len); 287 288 BPF_TAP(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN); 289 290 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if); 291 292 if (top) 293 netisr_queue(NETISR_IP, top); 294 break; 295 296 err: 297 kprintf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs); 298 299 sc->ic_iferrs = 0; /* reset error count */ 300 IFNET_STAT_INC(&sc->ic_if, ierrors, 1); 301 302 break; 303 304 case INTR_RECEIVE: 305 if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) { 306 sc->ic_iferrs ++; 307 308 } else { 309 *sc->ic_cp++ = *ptr; 310 sc->ic_xfercnt ++; 311 } 312 break; 313 314 case INTR_NOACK: /* xfer terminated by master */ 315 break; 316 317 case INTR_TRANSMIT: 318 *ptr = 0xff; /* XXX */ 319 break; 320 321 case INTR_ERROR: 322 sc->ic_iferrs ++; 323 break; 324 325 default: 326 panic("%s: unknown event (%d)!", __func__, event); 327 } 328 329 crit_exit(); 330 } 331 332 /* 333 * icoutput() 334 */ 335 static int 336 icoutput(struct ifnet *ifp, struct mbuf *m, 337 struct sockaddr *dst, struct rtentry *rt) 338 { 339 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit); 340 device_t parent = device_get_parent(icdev); 341 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 342 int len, sent; 343 struct mbuf *mm; 344 u_char *cp; 345 uint32_t hdr = dst->sa_family; 346 347 ifp->if_flags |= IFF_RUNNING; 348 349 crit_enter(); 350 351 /* already sending? */ 352 if (sc->ic_sending) { 353 IFNET_STAT_INC(ifp, oerrors, 1); 354 goto error; 355 } 356 357 /* insert header */ 358 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); 359 360 cp = sc->ic_obuf + ICHDRLEN; 361 len = 0; 362 mm = m; 363 do { 364 if (len + mm->m_len > sc->ic_if.if_mtu) { 365 /* packet to large */ 366 IFNET_STAT_INC(ifp, oerrors, 1); 367 goto error; 368 } 369 370 bcopy(mtod(mm,char *), cp, mm->m_len); 371 cp += mm->m_len; 372 len += mm->m_len; 373 374 } while ((mm = mm->m_next)); 375 376 if (ifp->if_bpf) { 377 bpf_gettoken(); 378 if (ifp->if_bpf) 379 bpf_ptap(ifp->if_bpf, m, &hdr, ICHDRLEN); 380 bpf_reltoken(); 381 } 382 383 sc->ic_sending = 1; 384 385 m_freem(m); 386 387 crit_exit(); 388 389 /* send the packet */ 390 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 391 len + ICHDRLEN, &sent)) 392 393 IFNET_STAT_INC(ifp, oerrors, 1); 394 else { 395 IFNET_STAT_INC(ifp, opackets, 1); 396 IFNET_STAT_INC(ifp, obytes, len); 397 } 398 399 sc->ic_sending = 0; 400 401 return (0); 402 403 error: 404 m_freem(m); 405 crit_exit(); 406 407 return(0); 408 } 409 410 DRIVER_MODULE(if_ic, iicbus, ic_driver, ic_devclass, NULL, NULL); 411 MODULE_DEPEND(if_ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 412 MODULE_VERSION(if_ic, 1); 413