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 #ifdef _KERNEL 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/proc.h> 37 #include <sys/mbuf.h> 38 #include <sys/socket.h> 39 #include <sys/filio.h> 40 #include <sys/sockio.h> 41 #include <sys/kernel.h> 42 #include <sys/module.h> 43 #include <sys/bus.h> 44 #include <sys/time.h> 45 #include <sys/malloc.h> 46 #include <sys/thread2.h> 47 48 #include <net/if.h> 49 #include <net/ifq_var.h> 50 #include <net/if_types.h> 51 #include <net/netisr.h> 52 53 #endif 54 #include <sys/mbuf.h> 55 #include <sys/socket.h> 56 #include <net/netisr.h> 57 #include <net/route.h> 58 #include <netinet/in.h> 59 #include <netinet/in_systm.h> 60 #include <netinet/in_var.h> 61 #include <netinet/ip.h> 62 #include <netinet/if_ether.h> 63 64 #include <net/bpf.h> 65 66 #include <bus/iicbus/iiconf.h> 67 #include <bus/iicbus/iicbus.h> 68 69 #include "iicbus_if.h" 70 71 #define PCF_MASTER_ADDRESS 0xaa 72 73 #define ICHDRLEN sizeof(uint32_t) 74 #define ICMTU 1500 /* default mtu */ 75 76 struct ic_softc { 77 struct ifnet ic_if; 78 79 u_char ic_addr; /* peer I2C address */ 80 81 int ic_sending; 82 83 char *ic_obuf; 84 char *ic_ifbuf; 85 char *ic_cp; 86 87 int ic_xfercnt; 88 89 int ic_iferrs; 90 }; 91 92 static devclass_t ic_devclass; 93 94 static int icprobe(device_t); 95 static int icattach(device_t); 96 97 static int icioctl(struct ifnet *, u_long, caddr_t, struct ucred *); 98 static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 99 struct rtentry *); 100 101 static void icintr(device_t, int, char *); 102 103 static device_method_t ic_methods[] = { 104 /* device interface */ 105 DEVMETHOD(device_probe, icprobe), 106 DEVMETHOD(device_attach, icattach), 107 108 /* iicbus interface */ 109 DEVMETHOD(iicbus_intr, icintr), 110 111 DEVMETHOD_END 112 }; 113 114 static driver_t ic_driver = { 115 "ic", 116 ic_methods, 117 sizeof(struct ic_softc), 118 }; 119 120 /* 121 * icprobe() 122 */ 123 static int 124 icprobe(device_t dev) 125 { 126 return (0); 127 } 128 129 /* 130 * icattach() 131 */ 132 static int 133 icattach(device_t dev) 134 { 135 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 136 struct ifnet *ifp = &sc->ic_if; 137 138 sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */ 139 140 ifp->if_softc = sc; 141 if_initname(ifp, "ic", device_get_unit(dev)); 142 ifp->if_mtu = ICMTU; 143 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 144 ifp->if_ioctl = icioctl; 145 ifp->if_output = icoutput; 146 ifp->if_type = IFT_PARA; 147 ifp->if_hdrlen = 0; 148 ifp->if_addrlen = 0; 149 ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN); 150 151 if_attach(ifp, NULL); 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, struct ucred *cr) 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)) && (ifp->if_flags & IFF_RUNNING)) { 185 186 /* XXX disable PCF */ 187 ifp->if_flags &= ~IFF_RUNNING; 188 189 /* IFF_UP is not set, try to release the bus anyway */ 190 iicbus_release_bus(parent, icdev); 191 break; 192 } 193 if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) { 194 195 if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR))) 196 return (error); 197 198 sc->ic_obuf = kmalloc(sc->ic_if.if_mtu + ICHDRLEN, 199 M_DEVBUF, M_WAITOK); 200 201 sc->ic_ifbuf = kmalloc(sc->ic_if.if_mtu + ICHDRLEN, 202 M_DEVBUF, M_WAITOK); 203 204 iicbus_reset(parent, IIC_FASTEST, 0, NULL); 205 206 ifp->if_flags |= IFF_RUNNING; 207 } 208 break; 209 210 case SIOCSIFMTU: 211 /* save previous buffers */ 212 iptr = sc->ic_ifbuf; 213 optr = sc->ic_obuf; 214 215 /* allocate input buffer */ 216 sc->ic_ifbuf = kmalloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK); 217 218 /* allocate output buffer */ 219 sc->ic_obuf = kmalloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK); 220 221 if (iptr) 222 kfree(iptr,M_DEVBUF); 223 224 if (optr) 225 kfree(optr,M_DEVBUF); 226 227 sc->ic_if.if_mtu = ifr->ifr_mtu; 228 break; 229 230 case SIOCGIFMTU: 231 ifr->ifr_mtu = sc->ic_if.if_mtu; 232 break; 233 234 case SIOCADDMULTI: 235 case SIOCDELMULTI: 236 if (ifr == NULL) { 237 return EAFNOSUPPORT; /* XXX */ 238 } 239 switch (ifr->ifr_addr.sa_family) { 240 241 case AF_INET: 242 break; 243 244 default: 245 return EAFNOSUPPORT; 246 } 247 break; 248 249 default: 250 return EINVAL; 251 } 252 return 0; 253 } 254 255 /* 256 * icintr() 257 */ 258 static void 259 icintr (device_t dev, int event, char *ptr) 260 { 261 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 262 int unit = device_get_unit(dev); 263 int len; 264 struct mbuf *top; 265 266 crit_enter(); 267 268 switch (event) { 269 270 case INTR_GENERAL: 271 case INTR_START: 272 sc->ic_cp = sc->ic_ifbuf; 273 sc->ic_xfercnt = 0; 274 break; 275 276 case INTR_STOP: 277 278 /* if any error occured during transfert, 279 * drop the packet */ 280 if (sc->ic_iferrs) 281 goto err; 282 283 if ((len = sc->ic_xfercnt) == 0) 284 break; /* ignore */ 285 286 if (len <= ICHDRLEN) 287 goto err; 288 289 len -= ICHDRLEN; 290 IFNET_STAT_INC(&sc->ic_if, ipackets, 1); 291 IFNET_STAT_INC(&sc->ic_if, ibytes, len); 292 293 BPF_TAP(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN); 294 295 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0); 296 297 if (top) 298 netisr_queue(NETISR_IP, top); 299 break; 300 301 err: 302 kprintf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs); 303 304 sc->ic_iferrs = 0; /* reset error count */ 305 IFNET_STAT_INC(&sc->ic_if, ierrors, 1); 306 307 break; 308 309 case INTR_RECEIVE: 310 if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) { 311 sc->ic_iferrs ++; 312 313 } else { 314 *sc->ic_cp++ = *ptr; 315 sc->ic_xfercnt ++; 316 } 317 break; 318 319 case INTR_NOACK: /* xfer terminated by master */ 320 break; 321 322 case INTR_TRANSMIT: 323 *ptr = 0xff; /* XXX */ 324 break; 325 326 case INTR_ERROR: 327 sc->ic_iferrs ++; 328 break; 329 330 default: 331 panic("%s: unknown event (%d)!", __func__, event); 332 } 333 334 crit_exit(); 335 } 336 337 /* 338 * icoutput() 339 */ 340 static int 341 icoutput(struct ifnet *ifp, struct mbuf *m, 342 struct sockaddr *dst, struct rtentry *rt) 343 { 344 device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit); 345 device_t parent = device_get_parent(icdev); 346 struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev); 347 int len, sent; 348 struct mbuf *mm; 349 u_char *cp; 350 uint32_t hdr = dst->sa_family; 351 352 ifp->if_flags |= IFF_RUNNING; 353 354 crit_enter(); 355 356 /* already sending? */ 357 if (sc->ic_sending) { 358 IFNET_STAT_INC(ifp, oerrors, 1); 359 goto error; 360 } 361 362 /* insert header */ 363 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); 364 365 cp = sc->ic_obuf + ICHDRLEN; 366 len = 0; 367 mm = m; 368 do { 369 if (len + mm->m_len > sc->ic_if.if_mtu) { 370 /* packet to large */ 371 IFNET_STAT_INC(ifp, oerrors, 1); 372 goto error; 373 } 374 375 bcopy(mtod(mm,char *), cp, mm->m_len); 376 cp += mm->m_len; 377 len += mm->m_len; 378 379 } while ((mm = mm->m_next)); 380 381 if (ifp->if_bpf) { 382 bpf_gettoken(); 383 if (ifp->if_bpf) 384 bpf_ptap(ifp->if_bpf, m, &hdr, ICHDRLEN); 385 bpf_reltoken(); 386 } 387 388 sc->ic_sending = 1; 389 390 m_freem(m); 391 392 crit_exit(); 393 394 /* send the packet */ 395 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 396 len + ICHDRLEN, &sent)) 397 398 IFNET_STAT_INC(ifp, oerrors, 1); 399 else { 400 IFNET_STAT_INC(ifp, opackets, 1); 401 IFNET_STAT_INC(ifp, obytes, len); 402 } 403 404 sc->ic_sending = 0; 405 406 return (0); 407 408 error: 409 m_freem(m); 410 crit_exit(); 411 412 return(0); 413 } 414 415 DRIVER_MODULE(if_ic, iicbus, ic_driver, ic_devclass, NULL, NULL); 416 MODULE_DEPEND(if_ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 417 MODULE_VERSION(if_ic, 1); 418