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/lock.h> 42 #include <sys/module.h> 43 #include <sys/mutex.h> 44 #include <sys/bus.h> 45 #include <sys/time.h> 46 #include <sys/malloc.h> 47 48 #include <net/if.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 <dev/iicbus/iiconf.h> 62 #include <dev/iicbus/iicbus.h> 63 64 #include "iicbus_if.h" 65 66 #define PCF_MASTER_ADDRESS 0xaa 67 68 #define ICHDRLEN sizeof(u_int32_t) 69 #define ICMTU 1500 /* default mtu */ 70 71 struct ic_softc { 72 struct ifnet *ic_ifp; 73 device_t ic_dev; 74 75 u_char ic_addr; /* peer I2C address */ 76 77 int ic_flags; 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 struct mtx ic_lock; 88 }; 89 90 #define IC_SENDING 0x0001 91 #define IC_OBUF_BUSY 0x0002 92 #define IC_IFBUF_BUSY 0x0004 93 #define IC_BUFFERS_BUSY (IC_OBUF_BUSY | IC_IFBUF_BUSY) 94 #define IC_BUFFER_WAITER 0x0004 95 96 static devclass_t ic_devclass; 97 98 static int icprobe(device_t); 99 static int icattach(device_t); 100 101 static int icioctl(struct ifnet *, u_long, caddr_t); 102 static int icoutput(struct ifnet *, struct mbuf *, const struct sockaddr *, 103 struct route *); 104 105 static int icintr(device_t, int, char *); 106 107 static device_method_t ic_methods[] = { 108 /* device interface */ 109 DEVMETHOD(device_probe, icprobe), 110 DEVMETHOD(device_attach, icattach), 111 112 /* iicbus interface */ 113 DEVMETHOD(iicbus_intr, icintr), 114 115 { 0, 0 } 116 }; 117 118 static driver_t ic_driver = { 119 "ic", 120 ic_methods, 121 sizeof(struct ic_softc), 122 }; 123 124 static void 125 ic_alloc_buffers(struct ic_softc *sc, int mtu) 126 { 127 char *obuf, *ifbuf; 128 129 obuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK); 130 ifbuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK); 131 132 mtx_lock(&sc->ic_lock); 133 while (sc->ic_flags & IC_BUFFERS_BUSY) { 134 sc->ic_flags |= IC_BUFFER_WAITER; 135 mtx_sleep(sc, &sc->ic_lock, 0, "icalloc", 0); 136 sc->ic_flags &= ~IC_BUFFER_WAITER; 137 } 138 139 free(sc->ic_obuf, M_DEVBUF); 140 free(sc->ic_ifbuf, M_DEVBUF); 141 sc->ic_obuf = obuf; 142 sc->ic_ifbuf = ifbuf; 143 sc->ic_ifp->if_mtu = mtu; 144 mtx_unlock(&sc->ic_lock); 145 } 146 147 /* 148 * icprobe() 149 */ 150 static int 151 icprobe(device_t dev) 152 { 153 return (BUS_PROBE_NOWILDCARD); 154 } 155 156 /* 157 * icattach() 158 */ 159 static int 160 icattach(device_t dev) 161 { 162 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 163 struct ifnet *ifp; 164 165 ifp = sc->ic_ifp = if_alloc(IFT_PARA); 166 if (ifp == NULL) 167 return (ENOSPC); 168 169 mtx_init(&sc->ic_lock, device_get_nameunit(dev), MTX_NETWORK_LOCK, 170 MTX_DEF); 171 sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */ 172 sc->ic_dev = dev; 173 174 ifp->if_softc = sc; 175 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 176 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 177 ifp->if_ioctl = icioctl; 178 ifp->if_output = icoutput; 179 ifp->if_hdrlen = 0; 180 ifp->if_addrlen = 0; 181 ifp->if_snd.ifq_maxlen = ifqmaxlen; 182 183 ic_alloc_buffers(sc, ICMTU); 184 185 if_attach(ifp); 186 187 bpfattach(ifp, DLT_NULL, ICHDRLEN); 188 189 return (0); 190 } 191 192 /* 193 * iciotcl() 194 */ 195 static int 196 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 197 { 198 struct ic_softc *sc = ifp->if_softc; 199 device_t icdev = sc->ic_dev; 200 device_t parent = device_get_parent(icdev); 201 struct ifaddr *ifa = (struct ifaddr *)data; 202 struct ifreq *ifr = (struct ifreq *)data; 203 int error; 204 205 switch (cmd) { 206 207 case SIOCAIFADDR: 208 case SIOCSIFADDR: 209 if (ifa->ifa_addr->sa_family != AF_INET) 210 return (EAFNOSUPPORT); 211 mtx_lock(&sc->ic_lock); 212 ifp->if_flags |= IFF_UP; 213 goto locked; 214 case SIOCSIFFLAGS: 215 mtx_lock(&sc->ic_lock); 216 locked: 217 if ((!(ifp->if_flags & IFF_UP)) && 218 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 219 220 /* XXX disable PCF */ 221 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 222 mtx_unlock(&sc->ic_lock); 223 224 /* IFF_UP is not set, try to release the bus anyway */ 225 iicbus_release_bus(parent, icdev); 226 break; 227 } 228 if (((ifp->if_flags & IFF_UP)) && 229 (!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 230 mtx_unlock(&sc->ic_lock); 231 if ((error = iicbus_request_bus(parent, icdev, 232 IIC_WAIT | IIC_INTR))) 233 return (error); 234 mtx_lock(&sc->ic_lock); 235 iicbus_reset(parent, IIC_FASTEST, 0, NULL); 236 ifp->if_drv_flags |= IFF_DRV_RUNNING; 237 } 238 mtx_unlock(&sc->ic_lock); 239 break; 240 241 case SIOCSIFMTU: 242 ic_alloc_buffers(sc, ifr->ifr_mtu); 243 break; 244 245 case SIOCGIFMTU: 246 mtx_lock(&sc->ic_lock); 247 ifr->ifr_mtu = sc->ic_ifp->if_mtu; 248 mtx_unlock(&sc->ic_lock); 249 break; 250 251 case SIOCADDMULTI: 252 case SIOCDELMULTI: 253 if (ifr == 0) 254 return (EAFNOSUPPORT); /* XXX */ 255 switch (ifr->ifr_addr.sa_family) { 256 case AF_INET: 257 break; 258 default: 259 return (EAFNOSUPPORT); 260 } 261 break; 262 default: 263 return (EINVAL); 264 } 265 return (0); 266 } 267 268 /* 269 * icintr() 270 */ 271 static int 272 icintr(device_t dev, int event, char *ptr) 273 { 274 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 275 struct mbuf *top; 276 int len; 277 278 mtx_lock(&sc->ic_lock); 279 280 switch (event) { 281 282 case INTR_GENERAL: 283 case INTR_START: 284 sc->ic_cp = sc->ic_ifbuf; 285 sc->ic_xfercnt = 0; 286 sc->ic_flags |= IC_IFBUF_BUSY; 287 break; 288 289 case INTR_STOP: 290 291 /* if any error occured during transfert, 292 * drop the packet */ 293 sc->ic_flags &= ~IC_IFBUF_BUSY; 294 if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) == 295 IC_BUFFER_WAITER) 296 wakeup(&sc); 297 if (sc->ic_iferrs) 298 goto err; 299 if ((len = sc->ic_xfercnt) == 0) 300 break; /* ignore */ 301 if (len <= ICHDRLEN) 302 goto err; 303 len -= ICHDRLEN; 304 sc->ic_ifp->if_ipackets++; 305 sc->ic_ifp->if_ibytes += len; 306 BPF_TAP(sc->ic_ifp, sc->ic_ifbuf, len + ICHDRLEN); 307 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, sc->ic_ifp, 0); 308 if (top) { 309 mtx_unlock(&sc->ic_lock); 310 M_SETFIB(top, sc->ic_ifp->if_fib); 311 netisr_dispatch(NETISR_IP, top); 312 mtx_lock(&sc->ic_lock); 313 } 314 break; 315 err: 316 if_printf(sc->ic_ifp, "errors (%d)!\n", sc->ic_iferrs); 317 sc->ic_iferrs = 0; /* reset error count */ 318 sc->ic_ifp->if_ierrors++; 319 break; 320 321 case INTR_RECEIVE: 322 if (sc->ic_xfercnt >= sc->ic_ifp->if_mtu + ICHDRLEN) { 323 sc->ic_iferrs++; 324 } else { 325 *sc->ic_cp++ = *ptr; 326 sc->ic_xfercnt++; 327 } 328 break; 329 330 case INTR_NOACK: /* xfer terminated by master */ 331 break; 332 333 case INTR_TRANSMIT: 334 *ptr = 0xff; /* XXX */ 335 break; 336 337 case INTR_ERROR: 338 sc->ic_iferrs++; 339 break; 340 341 default: 342 panic("%s: unknown event (%d)!", __func__, event); 343 } 344 345 mtx_unlock(&sc->ic_lock); 346 return (0); 347 } 348 349 /* 350 * icoutput() 351 */ 352 static int 353 icoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 354 struct route *ro) 355 { 356 struct ic_softc *sc = ifp->if_softc; 357 device_t icdev = sc->ic_dev; 358 device_t parent = device_get_parent(icdev); 359 int len, sent; 360 struct mbuf *mm; 361 u_char *cp; 362 u_int32_t hdr; 363 364 /* BPF writes need to be handled specially. */ 365 if (dst->sa_family == AF_UNSPEC) 366 bcopy(dst->sa_data, &hdr, sizeof(hdr)); 367 else 368 hdr = dst->sa_family; 369 370 mtx_lock(&sc->ic_lock); 371 ifp->if_drv_flags |= IFF_DRV_RUNNING; 372 373 /* already sending? */ 374 if (sc->ic_flags & IC_SENDING) { 375 ifp->if_oerrors++; 376 goto error; 377 } 378 379 /* insert header */ 380 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); 381 382 cp = sc->ic_obuf + ICHDRLEN; 383 len = 0; 384 mm = m; 385 do { 386 if (len + mm->m_len > sc->ic_ifp->if_mtu) { 387 /* packet too large */ 388 ifp->if_oerrors++; 389 goto error; 390 } 391 392 bcopy(mtod(mm,char *), cp, mm->m_len); 393 cp += mm->m_len; 394 len += mm->m_len; 395 396 } while ((mm = mm->m_next)); 397 398 BPF_MTAP2(ifp, &hdr, sizeof(hdr), m); 399 400 sc->ic_flags |= (IC_SENDING | IC_OBUF_BUSY); 401 402 m_freem(m); 403 mtx_unlock(&sc->ic_lock); 404 405 /* send the packet */ 406 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 407 len + ICHDRLEN, &sent)) 408 409 ifp->if_oerrors++; 410 else { 411 ifp->if_opackets++; 412 ifp->if_obytes += len; 413 } 414 415 mtx_lock(&sc->ic_lock); 416 sc->ic_flags &= ~(IC_SENDING | IC_OBUF_BUSY); 417 if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) == 418 IC_BUFFER_WAITER) 419 wakeup(&sc); 420 mtx_unlock(&sc->ic_lock); 421 422 return (0); 423 424 error: 425 m_freem(m); 426 mtx_unlock(&sc->ic_lock); 427 428 return(0); 429 } 430 431 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0); 432 MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 433 MODULE_VERSION(ic, 1); 434