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 devclass_t ic_devclass; 100 101 static int icprobe(device_t); 102 static int icattach(device_t); 103 104 static int icioctl(struct ifnet *, u_long, caddr_t); 105 static int icoutput(struct ifnet *, struct mbuf *, const struct sockaddr *, 106 struct route *); 107 108 static int icintr(device_t, int, char *); 109 110 static device_method_t ic_methods[] = { 111 /* device interface */ 112 DEVMETHOD(device_probe, icprobe), 113 DEVMETHOD(device_attach, icattach), 114 115 /* iicbus interface */ 116 DEVMETHOD(iicbus_intr, icintr), 117 118 { 0, 0 } 119 }; 120 121 static driver_t ic_driver = { 122 "ic", 123 ic_methods, 124 sizeof(struct ic_softc), 125 }; 126 127 static void 128 ic_alloc_buffers(struct ic_softc *sc, int mtu) 129 { 130 char *obuf, *ifbuf; 131 132 obuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK); 133 ifbuf = malloc(mtu + ICHDRLEN, M_DEVBUF, M_WAITOK); 134 135 mtx_lock(&sc->ic_lock); 136 while (sc->ic_flags & IC_BUFFERS_BUSY) { 137 sc->ic_flags |= IC_BUFFER_WAITER; 138 mtx_sleep(sc, &sc->ic_lock, 0, "icalloc", 0); 139 sc->ic_flags &= ~IC_BUFFER_WAITER; 140 } 141 142 free(sc->ic_obuf, M_DEVBUF); 143 free(sc->ic_ifbuf, M_DEVBUF); 144 sc->ic_obuf = obuf; 145 sc->ic_ifbuf = ifbuf; 146 sc->ic_ifp->if_mtu = mtu; 147 mtx_unlock(&sc->ic_lock); 148 } 149 150 /* 151 * icprobe() 152 */ 153 static int 154 icprobe(device_t dev) 155 { 156 return (BUS_PROBE_NOWILDCARD); 157 } 158 159 /* 160 * icattach() 161 */ 162 static int 163 icattach(device_t dev) 164 { 165 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 166 struct ifnet *ifp; 167 168 ifp = sc->ic_ifp = if_alloc(IFT_PARA); 169 if (ifp == NULL) 170 return (ENOSPC); 171 172 mtx_init(&sc->ic_lock, device_get_nameunit(dev), MTX_NETWORK_LOCK, 173 MTX_DEF); 174 sc->ic_addr = PCF_MASTER_ADDRESS; /* XXX only PCF masters */ 175 sc->ic_dev = dev; 176 177 ifp->if_softc = sc; 178 if_initname(ifp, device_get_name(dev), device_get_unit(dev)); 179 ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST; 180 ifp->if_ioctl = icioctl; 181 ifp->if_output = icoutput; 182 ifp->if_hdrlen = 0; 183 ifp->if_addrlen = 0; 184 ifp->if_snd.ifq_maxlen = ifqmaxlen; 185 186 ic_alloc_buffers(sc, ICMTU); 187 188 if_attach(ifp); 189 190 bpfattach(ifp, DLT_NULL, ICHDRLEN); 191 192 return (0); 193 } 194 195 /* 196 * iciotcl() 197 */ 198 static int 199 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 200 { 201 struct ic_softc *sc = ifp->if_softc; 202 device_t icdev = sc->ic_dev; 203 device_t parent = device_get_parent(icdev); 204 struct ifaddr *ifa = (struct ifaddr *)data; 205 struct ifreq *ifr = (struct ifreq *)data; 206 int error; 207 208 switch (cmd) { 209 210 case SIOCAIFADDR: 211 case SIOCSIFADDR: 212 if (ifa->ifa_addr->sa_family != AF_INET) 213 return (EAFNOSUPPORT); 214 mtx_lock(&sc->ic_lock); 215 ifp->if_flags |= IFF_UP; 216 goto locked; 217 case SIOCSIFFLAGS: 218 mtx_lock(&sc->ic_lock); 219 locked: 220 if ((!(ifp->if_flags & IFF_UP)) && 221 (ifp->if_drv_flags & IFF_DRV_RUNNING)) { 222 223 /* XXX disable PCF */ 224 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; 225 mtx_unlock(&sc->ic_lock); 226 227 /* IFF_UP is not set, try to release the bus anyway */ 228 iicbus_release_bus(parent, icdev); 229 break; 230 } 231 if (((ifp->if_flags & IFF_UP)) && 232 (!(ifp->if_drv_flags & IFF_DRV_RUNNING))) { 233 mtx_unlock(&sc->ic_lock); 234 if ((error = iicbus_request_bus(parent, icdev, 235 IIC_WAIT | IIC_INTR))) 236 return (error); 237 mtx_lock(&sc->ic_lock); 238 iicbus_reset(parent, IIC_FASTEST, 0, NULL); 239 ifp->if_drv_flags |= IFF_DRV_RUNNING; 240 } 241 mtx_unlock(&sc->ic_lock); 242 break; 243 244 case SIOCSIFMTU: 245 ic_alloc_buffers(sc, ifr->ifr_mtu); 246 break; 247 248 case SIOCGIFMTU: 249 mtx_lock(&sc->ic_lock); 250 ifr->ifr_mtu = sc->ic_ifp->if_mtu; 251 mtx_unlock(&sc->ic_lock); 252 break; 253 254 case SIOCADDMULTI: 255 case SIOCDELMULTI: 256 if (ifr == NULL) 257 return (EAFNOSUPPORT); /* XXX */ 258 switch (ifr->ifr_addr.sa_family) { 259 case AF_INET: 260 break; 261 default: 262 return (EAFNOSUPPORT); 263 } 264 break; 265 default: 266 return (EINVAL); 267 } 268 return (0); 269 } 270 271 /* 272 * icintr() 273 */ 274 static int 275 icintr(device_t dev, int event, char *ptr) 276 { 277 struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev); 278 struct mbuf *top; 279 int len; 280 281 mtx_lock(&sc->ic_lock); 282 283 switch (event) { 284 285 case INTR_GENERAL: 286 case INTR_START: 287 sc->ic_cp = sc->ic_ifbuf; 288 sc->ic_xfercnt = 0; 289 sc->ic_flags |= IC_IFBUF_BUSY; 290 break; 291 292 case INTR_STOP: 293 294 /* if any error occurred during transfert, 295 * drop the packet */ 296 sc->ic_flags &= ~IC_IFBUF_BUSY; 297 if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) == 298 IC_BUFFER_WAITER) 299 wakeup(&sc); 300 if (sc->ic_iferrs) 301 goto err; 302 if ((len = sc->ic_xfercnt) == 0) 303 break; /* ignore */ 304 if (len <= ICHDRLEN) 305 goto err; 306 len -= ICHDRLEN; 307 if_inc_counter(sc->ic_ifp, IFCOUNTER_IPACKETS, 1); 308 if_inc_counter(sc->ic_ifp, IFCOUNTER_IBYTES, len); 309 BPF_TAP(sc->ic_ifp, sc->ic_ifbuf, len + ICHDRLEN); 310 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, sc->ic_ifp, 0); 311 if (top) { 312 struct epoch_tracker et; 313 314 mtx_unlock(&sc->ic_lock); 315 M_SETFIB(top, sc->ic_ifp->if_fib); 316 NET_EPOCH_ENTER(et); 317 netisr_dispatch(NETISR_IP, top); 318 NET_EPOCH_EXIT(et); 319 mtx_lock(&sc->ic_lock); 320 } 321 break; 322 err: 323 if_printf(sc->ic_ifp, "errors (%d)!\n", sc->ic_iferrs); 324 sc->ic_iferrs = 0; /* reset error count */ 325 if_inc_counter(sc->ic_ifp, IFCOUNTER_IERRORS, 1); 326 break; 327 328 case INTR_RECEIVE: 329 if (sc->ic_xfercnt >= sc->ic_ifp->if_mtu + ICHDRLEN) { 330 sc->ic_iferrs++; 331 } else { 332 *sc->ic_cp++ = *ptr; 333 sc->ic_xfercnt++; 334 } 335 break; 336 337 case INTR_NOACK: /* xfer terminated by master */ 338 break; 339 340 case INTR_TRANSMIT: 341 *ptr = 0xff; /* XXX */ 342 break; 343 344 case INTR_ERROR: 345 sc->ic_iferrs++; 346 break; 347 348 default: 349 panic("%s: unknown event (%d)!", __func__, event); 350 } 351 352 mtx_unlock(&sc->ic_lock); 353 return (0); 354 } 355 356 /* 357 * icoutput() 358 */ 359 static int 360 icoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, 361 struct route *ro) 362 { 363 struct ic_softc *sc = ifp->if_softc; 364 device_t icdev = sc->ic_dev; 365 device_t parent = device_get_parent(icdev); 366 int len, sent; 367 struct mbuf *mm; 368 u_char *cp; 369 u_int32_t hdr; 370 371 /* BPF writes need to be handled specially. */ 372 if (dst->sa_family == AF_UNSPEC) 373 bcopy(dst->sa_data, &hdr, sizeof(hdr)); 374 else 375 hdr = dst->sa_family; 376 377 mtx_lock(&sc->ic_lock); 378 ifp->if_drv_flags |= IFF_DRV_RUNNING; 379 380 /* already sending? */ 381 if (sc->ic_flags & IC_SENDING) { 382 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 383 goto error; 384 } 385 386 /* insert header */ 387 bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN); 388 389 cp = sc->ic_obuf + ICHDRLEN; 390 len = 0; 391 mm = m; 392 do { 393 if (len + mm->m_len > sc->ic_ifp->if_mtu) { 394 /* packet too large */ 395 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 396 goto error; 397 } 398 399 bcopy(mtod(mm,char *), cp, mm->m_len); 400 cp += mm->m_len; 401 len += mm->m_len; 402 403 } while ((mm = mm->m_next)); 404 405 BPF_MTAP2(ifp, &hdr, sizeof(hdr), m); 406 407 sc->ic_flags |= (IC_SENDING | IC_OBUF_BUSY); 408 409 m_freem(m); 410 mtx_unlock(&sc->ic_lock); 411 412 /* send the packet */ 413 if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf, 414 len + ICHDRLEN, &sent)) 415 416 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); 417 else { 418 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); 419 if_inc_counter(ifp, IFCOUNTER_OBYTES, len); 420 } 421 422 mtx_lock(&sc->ic_lock); 423 sc->ic_flags &= ~(IC_SENDING | IC_OBUF_BUSY); 424 if ((sc->ic_flags & (IC_BUFFERS_BUSY | IC_BUFFER_WAITER)) == 425 IC_BUFFER_WAITER) 426 wakeup(&sc); 427 mtx_unlock(&sc->ic_lock); 428 429 return (0); 430 431 error: 432 m_freem(m); 433 mtx_unlock(&sc->ic_lock); 434 435 return(0); 436 } 437 438 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0); 439 MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER); 440 MODULE_VERSION(ic, 1); 441