1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 1998, 2001 Nicolas Souchu 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 /* 33 * I2C bus IP driver 34 */ 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/mbuf.h> 39 #include <sys/socket.h> 40 #include <sys/filio.h> 41 #include <sys/sockio.h> 42 #include <sys/kernel.h> 43 #include <sys/lock.h> 44 #include <sys/module.h> 45 #include <sys/mutex.h> 46 #include <sys/bus.h> 47 #include <sys/time.h> 48 #include <sys/malloc.h> 49 50 #include <net/if.h> 51 #include <net/if_var.h> 52 #include <net/if_types.h> 53 #include <net/netisr.h> 54 55 #include <net/route.h> 56 #include <netinet/in.h> 57 #include <netinet/in_systm.h> 58 #include <netinet/in_var.h> 59 #include <netinet/ip.h> 60 #include <netinet/if_ether.h> 61 62 #include <net/bpf.h> 63 64 #include <dev/iicbus/iiconf.h> 65 #include <dev/iicbus/iicbus.h> 66 67 #include "iicbus_if.h" 68 69 #define PCF_MASTER_ADDRESS 0xaa 70 71 #define ICHDRLEN sizeof(u_int32_t) 72 #define ICMTU 1500 /* default mtu */ 73 74 struct ic_softc { 75 struct ifnet *ic_ifp; 76 device_t ic_dev; 77 78 u_char ic_addr; /* peer I2C address */ 79 80 int ic_flags; 81 82 char *ic_obuf; 83 char *ic_ifbuf; 84 char *ic_cp; 85 86 int ic_xfercnt; 87 88 int ic_iferrs; 89 90 struct mtx ic_lock; 91 }; 92 93 #define IC_SENDING 0x0001 94 #define IC_OBUF_BUSY 0x0002 95 #define IC_IFBUF_BUSY 0x0004 96 #define IC_BUFFERS_BUSY (IC_OBUF_BUSY | IC_IFBUF_BUSY) 97 #define IC_BUFFER_WAITER 0x0004 98 99 static int icprobe(device_t); 100 static int icattach(device_t); 101 102 static int icioctl(struct ifnet *, u_long, caddr_t); 103 static int icoutput(struct ifnet *, struct mbuf *, const struct sockaddr *, 104 struct route *); 105 106 static int icintr(device_t, int, char *); 107 108 static device_method_t ic_methods[] = { 109 /* device interface */ 110 DEVMETHOD(device_probe, icprobe), 111 DEVMETHOD(device_attach, icattach), 112 113 /* iicbus interface */ 114 DEVMETHOD(iicbus_intr, icintr), 115 116 { 0, 0 } 117 }; 118 119 static driver_t ic_driver = { 120 "ic", 121 ic_methods, 122 sizeof(struct ic_softc), 123 }; 124 125 static void 126 ic_alloc_buffers(struct ic_softc *sc, int mtu) 127 { 128 char *obuf, *ifbuf; 129 130 obuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK); 131 ifbuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK); 132 133 mtx_lock(&sc->ic_lock); 134 while (sc->ic_flags & IC_BUFFERS_BUSY) { 135 sc->ic_flags |= IC_BUFFER_WAITER; 136 mtx_sleep(sc, &sc->ic_lock, 0, "icalloc", 0); 137 sc->ic_flags &= ~IC_BUFFER_WAITER; 138 } 139 140 free(sc->ic_obuf, M_DEVBUF); 141 free(sc->ic_ifbuf, M_DEVBUF); 142 sc->ic_obuf = obuf; 143 sc->ic_ifbuf = ifbuf; 144 sc->ic_ifp->if_mtu = mtu; 145 mtx_unlock(&sc->ic_lock); 146 } 147 148 /* 149 * icprobe() 150 */ 151 static int 152 icprobe(device_t dev) 153 { 154 return (BUS_PROBE_NOWILDCARD); 155 } 156 157 /* 158 * icattach() 159 */ 160 static int 161 icattach(device_t dev) 162 { 163 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 164 struct ifnet *ifp; 165 166 ifp = sc->ic_ifp = if_alloc(IFT_PARA); 167 if (ifp == NULL) 168 return (ENOSPC); 169 170 mtx_init(&sc->ic_lock, device_get_nameunit(dev), MTX_NETWORK_LOCK, 171 MTX_DEF); 172 sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */ 173 sc->ic_dev = dev; 174 175 ifp->if_softc = sc; 176 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 177 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 178 ifp->if_ioctl = icioctl; 179 ifp->if_output = icoutput; 180 ifp->if_hdrlen = 0; 181 ifp->if_addrlen = 0; 182 ifp->if_snd.ifq_maxlen = ifqmaxlen; 183 184 ic_alloc_buffers(sc, ICMTU); 185 186 if_attach(ifp); 187 188 bpfattach(ifp, DLT_NULL, ICHDRLEN); 189 190 return (0); 191 } 192 193 /* 194 * iciotcl() 195 */ 196 static int 197 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 198 { 199 struct ic_softc *sc = ifp->if_softc; 200 device_t icdev = sc->ic_dev; 201 device_t parent = device_get_parent(icdev); 202 struct ifaddr *ifa = (struct ifaddr *)data; 203 struct ifreq *ifr = (struct ifreq *)data; 204 int error; 205 206 switch (cmd) { 207 208 case SIOCAIFADDR: 209 case SIOCSIFADDR: 210 if (ifa->ifa_addr->sa_family != AF_INET) 211 return (EAFNOSUPPORT); 212 mtx_lock(&sc->ic_lock); 213 ifp->if_flags |= IFF_UP; 214 goto locked; 215 case SIOCSIFFLAGS: 216 mtx_lock(&sc->ic_lock); 217 locked: 218 if ((!(ifp->if_flags & IFF_UP)) && 219 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 220 221 /* XXX disable PCF */ 222 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 223 mtx_unlock(&sc->ic_lock); 224 225 /* IFF_UP is not set, try to release the bus anyway */ 226 iicbus_release_bus(parent, icdev); 227 break; 228 } 229 if (((ifp->if_flags & IFF_UP)) && 230 (!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 231 mtx_unlock(&sc->ic_lock); 232 if ((error = iicbus_request_bus(parent, icdev, 233 IIC_WAIT | IIC_INTR))) 234 return (error); 235 mtx_lock(&sc->ic_lock); 236 iicbus_reset(parent, IIC_FASTEST, 0, NULL); 237 ifp->if_drv_flags |= IFF_DRV_RUNNING; 238 } 239 mtx_unlock(&sc->ic_lock); 240 break; 241 242 case SIOCSIFMTU: 243 ic_alloc_buffers(sc, ifr->ifr_mtu); 244 break; 245 246 case SIOCGIFMTU: 247 mtx_lock(&sc->ic_lock); 248 ifr->ifr_mtu = sc->ic_ifp->if_mtu; 249 mtx_unlock(&sc->ic_lock); 250 break; 251 252 case SIOCADDMULTI: 253 case SIOCDELMULTI: 254 if (ifr == NULL) 255 return (EAFNOSUPPORT); /* XXX */ 256 switch (ifr->ifr_addr.sa_family) { 257 case AF_INET: 258 break; 259 default: 260 return (EAFNOSUPPORT); 261 } 262 break; 263 default: 264 return (EINVAL); 265 } 266 return (0); 267 } 268 269 /* 270 * icintr() 271 */ 272 static int 273 icintr(device_t dev, int event, char *ptr) 274 { 275 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 276 struct mbuf *top; 277 int len; 278 279 mtx_lock(&sc->ic_lock); 280 281 switch (event) { 282 283 case INTR_GENERAL: 284 case INTR_START: 285 sc->ic_cp = sc->ic_ifbuf; 286 sc->ic_xfercnt = 0; 287 sc->ic_flags |= IC_IFBUF_BUSY; 288 break; 289 290 case INTR_STOP: 291 292 /* if any error occurred during transfert, 293 * drop the packet */ 294 sc->ic_flags &= ~IC_IFBUF_BUSY; 295 if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) == 296 IC_BUFFER_WAITER) 297 wakeup(&sc); 298 if (sc->ic_iferrs) 299 goto err; 300 if ((len = sc->ic_xfercnt) == 0) 301 break; /* ignore */ 302 if (len <= ICHDRLEN) 303 goto err; 304 len -= ICHDRLEN; 305 if_inc_counter(sc->ic_ifp, IFCOUNTER_IPACKETS, 1); 306 if_inc_counter(sc->ic_ifp, IFCOUNTER_IBYTES, len); 307 BPF_TAP(sc->ic_ifp, sc->ic_ifbuf, len + ICHDRLEN); 308 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, sc->ic_ifp, 0); 309 if (top) { 310 struct epoch_tracker et; 311 312 mtx_unlock(&sc->ic_lock); 313 M_SETFIB(top, sc->ic_ifp->if_fib); 314 NET_EPOCH_ENTER(et); 315 netisr_dispatch(NETISR_IP, top); 316 NET_EPOCH_EXIT(et); 317 mtx_lock(&sc->ic_lock); 318 } 319 break; 320 err: 321 if_printf(sc->ic_ifp, "errors (%d)!\n", sc->ic_iferrs); 322 sc->ic_iferrs = 0; /* reset error count */ 323 if_inc_counter(sc->ic_ifp, IFCOUNTER_IERRORS, 1); 324 break; 325 326 case INTR_RECEIVE: 327 if (sc->ic_xfercnt >= sc->ic_ifp->if_mtu + ICHDRLEN) { 328 sc->ic_iferrs++; 329 } else { 330 *sc->ic_cp++ = *ptr; 331 sc->ic_xfercnt++; 332 } 333 break; 334 335 case INTR_NOACK: /* xfer terminated by master */ 336 break; 337 338 case INTR_TRANSMIT: 339 *ptr = 0xff; /* XXX */ 340 break; 341 342 case INTR_ERROR: 343 sc->ic_iferrs++; 344 break; 345 346 default: 347 panic("%s: unknown event (%d)!", __func__, event); 348 } 349 350 mtx_unlock(&sc->ic_lock); 351 return (0); 352 } 353 354 /* 355 * icoutput() 356 */ 357 static int 358 icoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 359 struct route *ro) 360 { 361 struct ic_softc *sc = ifp->if_softc; 362 device_t icdev = sc->ic_dev; 363 device_t parent = device_get_parent(icdev); 364 int len, sent; 365 struct mbuf *mm; 366 u_char *cp; 367 u_int32_t hdr; 368 369 /* BPF writes need to be handled specially. */ 370 if (dst->sa_family == AF_UNSPEC) 371 bcopy(dst->sa_data, &hdr, sizeof(hdr)); 372 else 373 hdr = RO_GET_FAMILY(ro, dst); 374 375 mtx_lock(&sc->ic_lock); 376 ifp->if_drv_flags |= IFF_DRV_RUNNING; 377 378 /* already sending? */ 379 if (sc->ic_flags & IC_SENDING) { 380 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 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_ifp->if_mtu) { 392 /* packet too large */ 393 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 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 BPF_MTAP2(ifp, &hdr, sizeof(hdr), m); 404 405 sc->ic_flags |= (IC_SENDING | IC_OBUF_BUSY); 406 407 m_freem(m); 408 mtx_unlock(&sc->ic_lock); 409 410 /* send the packet */ 411 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 412 len + ICHDRLEN, &sent)) 413 414 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 415 else { 416 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 417 if_inc_counter(ifp, IFCOUNTER_OBYTES, len); 418 } 419 420 mtx_lock(&sc->ic_lock); 421 sc->ic_flags &= ~(IC_SENDING | IC_OBUF_BUSY); 422 if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) == 423 IC_BUFFER_WAITER) 424 wakeup(&sc); 425 mtx_unlock(&sc->ic_lock); 426 427 return (0); 428 429 error: 430 m_freem(m); 431 mtx_unlock(&sc->ic_lock); 432 433 return(0); 434 } 435 436 DRIVER_MODULE(ic, iicbus, ic_driver, 0, 0); 437 MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 438 MODULE_VERSION(ic, 1); 439