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 1.17 2006/12/23 00:26:20 swildner 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 #include <sys/thread2.h>
  48
  49 #include <net/if.h>
  50 #include <net/ifq_var.h>
  51 #include <net/if_types.h>
  52 #include <net/netisr.h>
  53
  54 #endif
  55 #include <sys/mbuf.h>
  56 #include <sys/socket.h>
  57 #include <net/netisr.h>
  58 #include <net/route.h>
  59 #include <netinet/in.h>
  60 #include <netinet/in_systm.h>
  61 #include <netinet/in_var.h>
  62 #include <netinet/ip.h>
  63 #include <netinet/if_ether.h>
  64
  65 #include <net/bpf.h>
  66
  67 #include <bus/iicbus/iiconf.h>
  68 #include <bus/iicbus/iicbus.h>
  69
  70 #include "iicbus_if.h"
  71
  72 #define ICHDRLEN        sizeof(uint32_t)
  73 #define ICMTU           1500            /* default mtu */
  74
  75 struct ic_softc {
  76         struct ifnet ic_if;
  77
  78         u_char ic_addr;                 /* peer I2C address */
  79
  80         int ic_sending;
  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
  91 static devclass_t ic_devclass;
  92
  93 static int icprobe(device_t);
  94 static int icattach(device_t);
  95
  96 static int icioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
  97 static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
  98                 struct rtentry *);
  99
 100 static void icintr(device_t, int, char *);
 101
 102 static device_method_t ic_methods[] = {
 103         /* device interface */
 104         DEVMETHOD(device_probe,         icprobe),
 105         DEVMETHOD(device_attach,        icattach),
 106
 107         /* iicbus interface */
 108         DEVMETHOD(iicbus_intr,          icintr),
 109
 110         { 0, 0 }
 111 };
 112
 113 static driver_t ic_driver = {
 114         "ic",
 115         ic_methods,
 116         sizeof(struct ic_softc),
 117 };
 118
 119 /*
 120  * icprobe()
 121  */
 122 static int
 123 icprobe(device_t dev)
 124 {
 125         return (0);
 126 }
 127
 128 /*
 129  * icattach()
 130  */
 131 static int
 132 icattach(device_t dev)
 133 {
 134         struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
 135         struct ifnet *ifp = &sc->ic_if;
 136
 137         sc->ic_addr = iicbus_get_addr(dev);
 138
 139         ifp->if_softc = sc;
 140         if_initname(ifp, "ic", device_get_unit(dev));
 141         ifp->if_mtu = ICMTU;
 142         ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST;
 143         ifp->if_ioctl = icioctl;
 144         ifp->if_output = icoutput;
 145         ifp->if_type = IFT_PARA;
 146         ifp->if_hdrlen = 0;
 147         ifp->if_addrlen = 0;
 148         ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN);
 149
 150         if_attach(ifp, NULL);
 151
 152         bpfattach(ifp, DLT_NULL, ICHDRLEN);
 153
 154         return (0);
 155 }
 156
 157 /*
 158  * iciotcl()
 159  */
 160 static int
 161 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
 162 {
 163     device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
 164     device_t parent = device_get_parent(icdev);
 165     struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
 166
 167     struct ifaddr *ifa = (struct ifaddr *)data;
 168     struct ifreq *ifr = (struct ifreq *)data;
 169
 170     u_char *iptr, *optr;
 171     int error;
 172
 173     switch (cmd) {
 174
 175     case SIOCSIFDSTADDR:
 176     case SIOCAIFADDR:
 177     case SIOCSIFADDR:
 178         if (ifa->ifa_addr->sa_family != AF_INET)
 179             return EAFNOSUPPORT;
 180         ifp->if_flags |= IFF_UP;
 181         /* FALLTHROUGH */
 182     case SIOCSIFFLAGS:
 183         if ((!(ifp->if_flags & IFF_UP)) && (ifp->if_flags & IFF_RUNNING)) {
 184
 185             /* XXX disable PCF */
 186             ifp->if_flags &= ~IFF_RUNNING;
 187
 188             /* IFF_UP is not set, try to release the bus anyway */
 189             iicbus_release_bus(parent, icdev);
 190             break;
 191         }
 192         if (((ifp->if_flags & IFF_UP)) && (!(ifp->if_flags & IFF_RUNNING))) {
 193
 194             if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR)))
 195                 return (error);
 196
 197             sc->ic_obuf = kmalloc(sc->ic_if.if_mtu + ICHDRLEN,
 198                                   M_DEVBUF, M_WAITOK);
 199             if (!sc->ic_obuf) {
 200                 iicbus_release_bus(parent, icdev);
 201                 return ENOBUFS;
 202             }
 203
 204             sc->ic_ifbuf = kmalloc(sc->ic_if.if_mtu + ICHDRLEN,
 205                                   M_DEVBUF, M_WAITOK);
 206             if (!sc->ic_ifbuf) {
 207                 iicbus_release_bus(parent, icdev);
 208                 return ENOBUFS;
 209             }
 210
 211             iicbus_reset(parent, IIC_FASTEST, 0, NULL);
 212
 213             ifp->if_flags |= IFF_RUNNING;
 214         }
 215         break;
 216
 217     case SIOCSIFMTU:
 218         /* save previous buffers */
 219         iptr = sc->ic_ifbuf;
 220         optr = sc->ic_obuf;
 221
 222         /* allocate input buffer */
 223         sc->ic_ifbuf = kmalloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK);
 224         if (!sc->ic_ifbuf) {
 225
 226             sc->ic_ifbuf = iptr;
 227             sc->ic_obuf = optr;
 228
 229             return ENOBUFS;
 230         }
 231
 232         /* allocate output buffer */
 233         sc->ic_ifbuf = kmalloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_WAITOK);
 234         if (!sc->ic_obuf) {
 235
 236             kfree(sc->ic_ifbuf,M_DEVBUF);
 237
 238             sc->ic_ifbuf = iptr;
 239             sc->ic_obuf = optr;
 240
 241             return ENOBUFS;
 242         }
 243
 244         if (iptr)
 245             kfree(iptr,M_DEVBUF);
 246
 247         if (optr)
 248             kfree(optr,M_DEVBUF);
 249
 250         sc->ic_if.if_mtu = ifr->ifr_mtu;
 251         break;
 252
 253     case SIOCGIFMTU:
 254         ifr->ifr_mtu = sc->ic_if.if_mtu;
 255         break;
 256
 257     case SIOCADDMULTI:
 258     case SIOCDELMULTI:
 259         if (ifr == 0) {
 260             return EAFNOSUPPORT;                /* XXX */
 261         }
 262         switch (ifr->ifr_addr.sa_family) {
 263
 264         case AF_INET:
 265             break;
 266
 267         default:
 268             return EAFNOSUPPORT;
 269         }
 270         break;
 271
 272     default:
 273         return EINVAL;
 274     }
 275     return 0;
 276 }
 277
 278 /*
 279  * icintr()
 280  */
 281 static void
 282 icintr (device_t dev, int event, char *ptr)
 283 {
 284         struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
 285         int unit = device_get_unit(dev);
 286         int len;
 287         struct mbuf *top;
 288
 289         crit_enter();
 290
 291         switch (event) {
 292
 293         case INTR_GENERAL:
 294         case INTR_START:
 295                 sc->ic_cp = sc->ic_ifbuf;
 296                 sc->ic_xfercnt = 0;
 297                 break;
 298
 299         case INTR_STOP:
 300
 301           /* if any error occured during transfert,
 302            * drop the packet */
 303           if (sc->ic_iferrs)
 304             goto err;
 305
 306           if ((len = sc->ic_xfercnt) == 0)
 307                 break;                                  /* ignore */
 308
 309           if (len <= ICHDRLEN)
 310             goto err;
 311
 312           len -= ICHDRLEN;
 313           sc->ic_if.if_ipackets ++;
 314           sc->ic_if.if_ibytes += len;
 315
 316           BPF_TAP(&sc->ic_if, sc->ic_ifbuf, len + ICHDRLEN);
 317
 318           top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, &sc->ic_if, 0);
 319
 320           if (top)
 321             netisr_dispatch(NETISR_IP, top);
 322           break;
 323
 324         err:
 325           kprintf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs);
 326
 327           sc->ic_iferrs = 0;                    /* reset error count */
 328           sc->ic_if.if_ierrors ++;
 329
 330           break;
 331
 332         case INTR_RECEIVE:
 333                 if (sc->ic_xfercnt >= sc->ic_if.if_mtu+ICHDRLEN) {
 334                         sc->ic_iferrs ++;
 335
 336                 } else {
 337                         *sc->ic_cp++ = *ptr;
 338                         sc->ic_xfercnt ++;
 339                 }
 340                 break;
 341
 342         case INTR_NOACK:                        /* xfer terminated by master */
 343                 break;
 344
 345         case INTR_TRANSMIT:
 346                 *ptr = 0xff;                                    /* XXX */
 347                 break;
 348
 349         case INTR_ERROR:
 350                 sc->ic_iferrs ++;
 351                 break;
 352
 353         default:
 354                 panic("%s: unknown event (%d)!", __func__, event);
 355         }
 356
 357         crit_exit();
 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         int len, sent;
 371         struct mbuf *mm;
 372         u_char *cp;
 373         uint32_t hdr = dst->sa_family;
 374
 375         ifp->if_flags |= IFF_RUNNING;
 376
 377         crit_enter();
 378
 379         /* already sending? */
 380         if (sc->ic_sending) {
 381                 ifp->if_oerrors ++;
 382                 goto error;
 383         }
 384
 385         /* insert header */
 386         bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN);
 387
 388         cp = sc->ic_obuf + ICHDRLEN;
 389         len = 0;
 390         mm = m;
 391         do {
 392                 if (len + mm->m_len > sc->ic_if.if_mtu) {
 393                         /* packet to large */
 394                         ifp->if_oerrors ++;
 395                         goto error;
 396                 }
 397
 398                 bcopy(mtod(mm,char *), cp, mm->m_len);
 399                 cp += mm->m_len;
 400                 len += mm->m_len;
 401
 402         } while ((mm = mm->m_next));
 403
 404         if (ifp->if_bpf)
 405                 bpf_ptap(ifp->if_bpf, m, &hdr, ICHDRLEN);
 406
 407         sc->ic_sending = 1;
 408
 409         m_freem(m);
 410
 411         crit_exit();
 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         crit_exit();
 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