sys/dev/netif/ic/if_ic.c

   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  * $DragonFly: src/sys/dev/netif/ic/if_ic.c,v 1.12 2005/02/18 23:19:08 joerg Exp $
  28  */
  29
  30 /*
  31  * I2C bus IP driver
  32  */
  33
  34 #ifdef _KERNEL
  35 #include <sys/param.h>
  36 #include <sys/systm.h>
  37 #include <sys/proc.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/module.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/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 ICHDRLEN        sizeof(uint32_t)
  72 #define ICMTU           1500            /* default mtu */
  73
  74 struct ic_softc {
  75         struct ifnet ic_if;
  76
  77         u_char ic_addr;                 /* peer I2C address */
  78
  79         int ic_sending;
  80
  81         char *ic_obuf;
  82         char *ic_ifbuf;
  83         char *ic_cp;
  84
  85         int ic_xfercnt;
  86
  87         int ic_iferrs;
  88 };
  89
  90 static devclass_t ic_devclass;
  91
  92 static int icprobe(device_t);
  93 static int icattach(device_t);
  94
  95 static int icioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
  96 static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
  97                 struct rtentry *);
  98
  99 static void icintr(device_t, int, char *);
 100
 101 static device_method_t ic_methods[] = {
 102         /* device interface */
 103         DEVMETHOD(device_probe,         icprobe),
 104         DEVMETHOD(device_attach,        icattach),
 105
 106         /* iicbus interface */
 107         DEVMETHOD(iicbus_intr,          icintr),
 108
 109         { 0, 0 }
 110 };
 111
 112 static driver_t ic_driver = {
 113         "ic",
 114         ic_methods,
 115         sizeof(struct ic_softc),
 116 };
 117
 118 /*
 119  * icprobe()
 120  */
 121 static int
 122 icprobe(device_t dev)
 123 {
 124         return (0);
 125 }
 126
 127 /*
 128  * icattach()
 129  */
 130 static int
 131 icattach(device_t dev)
 132 {
 133         struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
 134         struct ifnet *ifp = &sc->ic_if;
 135
 136         sc->ic_addr = iicbus_get_addr(dev);
 137
 138         ifp->if_softc = sc;
 139         if_initname(ifp, "ic", device_get_unit(dev));
 140         ifp->if_mtu = ICMTU;
 141         ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
 142         ifp->if_ioctl = icioctl;
 143         ifp->if_output = icoutput;
 144         ifp->if_type = IFT_PARA;
 145         ifp->if_hdrlen = 0;
 146         ifp->if_addrlen = 0;
 147         ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN);
 148
 149         if_attach(ifp);
 150
 151         bpfattach(ifp, DLT_NULL, ICHDRLEN);
 152
 153         return (0);
 154 }
 155
 156 /*
 157  * iciotcl()
 158  */
 159 static int
 160 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 161 {
 162     device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
 163     device_t parent = device_get_parent(icdev);
 164     struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
 165
 166     struct ifaddr *ifa = (struct ifaddr *)data;
 167     struct ifreq *ifr = (struct ifreq *)data;
 168
 169     u_char *iptr, *optr;
 170     int error;
 171
 172     switch (cmd) {
 173
 174     case SIOCSIFDSTADDR:
 175     case SIOCAIFADDR:
 176     case SIOCSIFADDR:
 177         if (ifa->ifa_addr->sa_family != AF_INET)
 178             return EAFNOSUPPORT;
 179         ifp->if_flags |= IFF_UP;
 180         /* FALLTHROUGH */
 181     case SIOCSIFFLAGS:
 182         if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
 183
 184             /* XXX disable PCF */
 185             ifp->if_flags &= ~IFF_RUNNING;
 186
 187             /* IFF_UP is not set, try to release the bus anyway */
 188             iicbus_release_bus(parent, icdev);
 189             break;
 190         }
 191         if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
 192
 193             if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR)))
 194                 return (error);
 195
 196             sc->ic_obuf = malloc(sc->ic_if.if_mtu + ICHDRLEN,
 197                                   M_DEVBUF, M_WAITOK);
 198             if (!sc->ic_obuf) {
 199                 iicbus_release_bus(parent, icdev);
 200                 return ENOBUFS;
 201             }
 202
 203             sc->ic_ifbuf = malloc(sc->ic_if.if_mtu + ICHDRLEN,
 204                                   M_DEVBUF, M_WAITOK);
 205             if (!sc->ic_ifbuf) {
 206                 iicbus_release_bus(parent, icdev);
 207                 return ENOBUFS;
 208             }
 209
 210             iicbus_reset(parent, IIC_FASTEST, 0, NULL);
 211
 212             ifp->if_flags |= IFF_RUNNING;
 213         }
 214         break;
 215
 216     case SIOCSIFMTU:
 217         /* save previous buffers */
 218         iptr = sc->ic_ifbuf;
 219         optr = sc->ic_obuf;
 220
 221         /* allocate input buffer */
 222         sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK);
 223         if (!sc->ic_ifbuf) {
 224
 225             sc->ic_ifbuf = iptr;
 226             sc->ic_obuf = optr;
 227
 228             return ENOBUFS;
 229         }
 230
 231         /* allocate output buffer */
 232         sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK);
 233         if (!sc->ic_obuf) {
 234
 235             free(sc->ic_ifbuf,M_DEVBUF);
 236
 237             sc->ic_ifbuf = iptr;
 238             sc->ic_obuf = optr;
 239
 240             return ENOBUFS;
 241         }
 242
 243         if (iptr)
 244             free(iptr,M_DEVBUF);
 245
 246         if (optr)
 247             free(optr,M_DEVBUF);
 248
 249         sc->ic_if.if_mtu = ifr->ifr_mtu;
 250         break;
 251
 252     case SIOCGIFMTU:
 253         ifr->ifr_mtu = sc->ic_if.if_mtu;
 254         break;
 255
 256     case SIOCADDMULTI:
 257     case SIOCDELMULTI:
 258         if (ifr == 0) {
 259             return EAFNOSUPPORT;                /* XXX */
 260         }
 261         switch (ifr->ifr_addr.sa_family) {
 262
 263         case AF_INET:
 264             break;
 265
 266         default:
 267             return EAFNOSUPPORT;
 268         }
 269         break;
 270
 271     default:
 272         return EINVAL;
 273     }
 274     return 0;
 275 }
 276
 277 /*
 278  * icintr()
 279  */
 280 static void
 281 icintr (device_t dev, int event, char *ptr)
 282 {
 283         struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
 284         int unit = device_get_unit(dev);
 285         int s, len;
 286         struct mbuf *top;
 287
 288         s = splhigh();
 289
 290         switch (event) {
 291
 292         case INTR_GENERAL:
 293         case INTR_START:
 294                 sc->ic_cp = sc->ic_ifbuf;
 295                 sc->ic_xfercnt = 0;
 296                 break;
 297
 298         case INTR_STOP:
 299
 300           /* if any error occured during transfert,
 301            * drop the packet */
 302           if (sc->ic_iferrs)
 303             goto err;
 304
 305           if ((len = sc->ic_xfercnt) == 0)
 306                 break;                                  /* ignore */
 307
 308           if (len <= ICHDRLEN)
 309             goto err;
 310
 311           len -= ICHDRLEN;
 312           sc->ic_if.if_ipackets ++;
 313           sc->ic_if.if_ibytes += len;
 314
 315           BPF_TAP(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN);
 316
 317           top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0);
 318
 319           if (top)
 320             netisr_dispatch(NETISR_IP, top);
 321           break;
 322
 323         err:
 324           printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs);
 325
 326           sc->ic_iferrs = 0;                    /* reset error count */
 327           sc->ic_if.if_ierrors ++;
 328
 329           break;
 330
 331         case INTR_RECEIVE:
 332                 if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) {
 333                         sc->ic_iferrs ++;
 334
 335                 } else {
 336                         *sc->ic_cp++ = *ptr;
 337                         sc->ic_xfercnt ++;
 338                 }
 339                 break;
 340
 341         case INTR_NOACK:                        /* xfer terminated by master */
 342                 break;
 343
 344         case INTR_TRANSMIT:
 345                 *ptr = 0xff;                                    /* XXX */
 346                 break;
 347
 348         case INTR_ERROR:
 349                 sc->ic_iferrs ++;
 350                 break;
 351
 352         default:
 353                 panic("%s: unknown event (%d)!", __func__, event);
 354         }
 355
 356         splx(s);
 357         return;
 358 }
 359
 360 /*
 361  * icoutput()
 362  */
 363 static int
 364 icoutput(struct ifnet *ifp, struct mbuf *m,
 365         struct sockaddr *dst, struct rtentry *rt)
 366 {
 367         device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
 368         device_t parent = device_get_parent(icdev);
 369         struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
 370
 371         int s, len, sent;
 372         struct mbuf *mm;
 373         u_char *cp;
 374         uint32_t hdr = dst->sa_family;
 375
 376         ifp->if_flags |= IFF_RUNNING;
 377
 378         s = splhigh();
 379
 380         /* already sending? */
 381         if (sc->ic_sending) {
 382                 ifp->if_oerrors ++;
 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_if.if_mtu) {
 394                         /* packet to large */
 395                         ifp->if_oerrors ++;
 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         if (ifp->if_bpf)
 406                 bpf_ptap(ifp->if_bpf, m, &hdr, ICHDRLEN);
 407
 408         sc->ic_sending = 1;
 409
 410         m_freem(m);
 411         splx(s);
 412
 413         /* send the packet */
 414         if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf,
 415                                 len + ICHDRLEN, &sent))
 416
 417                 ifp->if_oerrors ++;
 418         else {
 419                 ifp->if_opackets ++;
 420                 ifp->if_obytes += len;
 421         }
 422
 423         sc->ic_sending = 0;
 424
 425         return (0);
 426
 427 error:
 428         m_freem(m);
 429         splx(s);
 430
 431         return(0);
 432 }
 433
 434 DECLARE_DUMMY_MODULE(if_ic);
 435 DRIVER_MODULE(if_ic, iicbus, ic_driver, ic_devclass, 0, 0);
 436