sys/dev/iicbus/if_ic.c

   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/module.h>
  42 #include <sys/bus.h>
  43 #include <sys/time.h>
  44 #include <sys/malloc.h>
  45
  46 #include <net/if.h>
  47 #include <net/if_types.h>
  48 #include <net/netisr.h>
  49
  50 #include <sys/mbuf.h>
  51 #include <sys/socket.h>
  52 #include <net/netisr.h>
  53 #include <net/route.h>
  54 #include <netinet/in.h>
  55 #include <netinet/in_systm.h>
  56 #include <netinet/in_var.h>
  57 #include <netinet/ip.h>
  58 #include <netinet/if_ether.h>
  59
  60 #include <net/bpf.h>
  61
  62 #include <dev/iicbus/iiconf.h>
  63 #include <dev/iicbus/iicbus.h>
  64
  65 #include "iicbus_if.h"
  66
  67 #define PCF_MASTER_ADDRESS 0xaa
  68
  69 #define ICHDRLEN        sizeof(u_int32_t)
  70 #define ICMTU           1500            /* default mtu */
  71
  72 struct ic_softc {
  73         struct ifnet *ic_ifp;
  74
  75         u_char ic_addr;                 /* peer I2C address */
  76
  77         int ic_sending;
  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
  88 static devclass_t ic_devclass;
  89
  90 static int icprobe(device_t);
  91 static int icattach(device_t);
  92
  93 static int icioctl(struct ifnet *, u_long, caddr_t);
  94 static int icoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
  95                 struct rtentry *);
  96
  97 static void icintr(device_t, int, char *);
  98
  99 static device_method_t ic_methods[] = {
 100         /* device interface */
 101         DEVMETHOD(device_probe,         icprobe),
 102         DEVMETHOD(device_attach,        icattach),
 103
 104         /* iicbus interface */
 105         DEVMETHOD(iicbus_intr,          icintr),
 106
 107         { 0, 0 }
 108 };
 109
 110 static driver_t ic_driver = {
 111         "ic",
 112         ic_methods,
 113         sizeof(struct ic_softc),
 114 };
 115
 116 /*
 117  * icprobe()
 118  */
 119 static int
 120 icprobe(device_t dev)
 121 {
 122         return (0);
 123 }
 124
 125 /*
 126  * icattach()
 127  */
 128 static int
 129 icattach(device_t dev)
 130 {
 131         struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
 132         struct ifnet *ifp;
 133
 134         ifp = sc->ic_ifp = if_alloc(IFT_PARA);
 135         if (ifp == NULL) {
 136                 return (ENOSPC);
 137         }
 138
 139         sc->ic_addr = PCF_MASTER_ADDRESS;       /* XXX only PCF masters */
 140
 141         ifp->if_softc = sc;
 142         if_initname(ifp, device_get_name(dev), device_get_unit(dev));
 143         ifp->if_mtu = ICMTU;
 144         ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST |
 145             IFF_NEEDSGIANT;
 146         ifp->if_ioctl = icioctl;
 147         ifp->if_output = icoutput;
 148         ifp->if_hdrlen = 0;
 149         ifp->if_addrlen = 0;
 150         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 151
 152         if_attach(ifp);
 153
 154         bpfattach(ifp, DLT_NULL, ICHDRLEN);
 155
 156         return (0);
 157 }
 158
 159 /*
 160  * iciotcl()
 161  */
 162 static int
 163 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 164 {
 165     device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
 166     device_t parent = device_get_parent(icdev);
 167     struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
 168
 169     struct ifaddr *ifa = (struct ifaddr *)data;
 170     struct ifreq *ifr = (struct ifreq *)data;
 171
 172     u_char *iptr, *optr;
 173     int error;
 174
 175     switch (cmd) {
 176
 177     case SIOCSIFDSTADDR:
 178     case SIOCAIFADDR:
 179     case SIOCSIFADDR:
 180         if (ifa->ifa_addr->sa_family != AF_INET)
 181             return EAFNOSUPPORT;
 182         ifp->if_flags |= IFF_UP;
 183         /* FALLTHROUGH */
 184     case SIOCSIFFLAGS:
 185         if ((!(ifp->if_flags & IFF_UP)) &&
 186           (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 187
 188             /* XXX disable PCF */
 189             ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 190
 191             /* IFF_UP is not set, try to release the bus anyway */
 192             iicbus_release_bus(parent, icdev);
 193             break;
 194         }
 195         if (((ifp->if_flags & IFF_UP)) &&
 196           (!(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 197
 198             if ((error = iicbus_request_bus(parent, icdev, IIC_WAIT|IIC_INTR)))
 199                 return (error);
 200
 201             sc->ic_obuf = malloc(sc->ic_ifp->if_mtu + ICHDRLEN,
 202                                   M_DEVBUF, M_WAITOK);
 203             if (!sc->ic_obuf) {
 204                 iicbus_release_bus(parent, icdev);
 205                 return ENOBUFS;
 206             }
 207
 208             sc->ic_ifbuf = malloc(sc->ic_ifp->if_mtu + ICHDRLEN,
 209                                   M_DEVBUF, M_WAITOK);
 210             if (!sc->ic_ifbuf) {
 211                 iicbus_release_bus(parent, icdev);
 212                 return ENOBUFS;
 213             }
 214
 215             iicbus_reset(parent, IIC_FASTEST, 0, NULL);
 216
 217             ifp->if_drv_flags |= IFF_DRV_RUNNING;
 218         }
 219         break;
 220
 221     case SIOCSIFMTU:
 222         /* save previous buffers */
 223         iptr = sc->ic_ifbuf;
 224         optr = sc->ic_obuf;
 225
 226         /* allocate input buffer */
 227         sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT);
 228         if (!sc->ic_ifbuf) {
 229
 230             sc->ic_ifbuf = iptr;
 231             sc->ic_obuf = optr;
 232
 233             return ENOBUFS;
 234         }
 235
 236         /* allocate output buffer */
 237         sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT);
 238         if (!sc->ic_obuf) {
 239
 240             free(sc->ic_ifbuf,M_DEVBUF);
 241
 242             sc->ic_ifbuf = iptr;
 243             sc->ic_obuf = optr;
 244
 245             return ENOBUFS;
 246         }
 247
 248         if (iptr)
 249             free(iptr,M_DEVBUF);
 250
 251         if (optr)
 252             free(optr,M_DEVBUF);
 253
 254         sc->ic_ifp->if_mtu = ifr->ifr_mtu;
 255         break;
 256
 257     case SIOCGIFMTU:
 258         ifr->ifr_mtu = sc->ic_ifp->if_mtu;
 259         break;
 260
 261     case SIOCADDMULTI:
 262     case SIOCDELMULTI:
 263         if (ifr == 0) {
 264             return EAFNOSUPPORT;                /* XXX */
 265         }
 266         switch (ifr->ifr_addr.sa_family) {
 267
 268         case AF_INET:
 269             break;
 270
 271         default:
 272             return EAFNOSUPPORT;
 273         }
 274         break;
 275
 276     default:
 277         return EINVAL;
 278     }
 279     return 0;
 280 }
 281
 282 /*
 283  * icintr()
 284  */
 285 static void
 286 icintr (device_t dev, int event, char *ptr)
 287 {
 288         struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
 289         int unit = device_get_unit(dev);
 290         int s, len;
 291         struct mbuf *top;
 292
 293         s = splhigh();
 294
 295         switch (event) {
 296
 297         case INTR_GENERAL:
 298         case INTR_START:
 299                 sc->ic_cp = sc->ic_ifbuf;
 300                 sc->ic_xfercnt = 0;
 301                 break;
 302
 303         case INTR_STOP:
 304
 305           /* if any error occured during transfert,
 306            * drop the packet */
 307           if (sc->ic_iferrs)
 308             goto err;
 309
 310           if ((len = sc->ic_xfercnt) == 0)
 311                 break;                                  /* ignore */
 312
 313           if (len <= ICHDRLEN)
 314             goto err;
 315
 316           len -= ICHDRLEN;
 317           sc->ic_ifp->if_ipackets ++;
 318           sc->ic_ifp->if_ibytes += len;
 319
 320           BPF_TAP(sc->ic_ifp, sc->ic_ifbuf, len + ICHDRLEN);
 321
 322           top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, sc->ic_ifp, 0);
 323
 324           if (top)
 325             netisr_dispatch(NETISR_IP, top);
 326           break;
 327
 328         err:
 329           printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs);
 330
 331           sc->ic_iferrs = 0;                    /* reset error count */
 332           sc->ic_ifp->if_ierrors ++;
 333
 334           break;
 335
 336         case INTR_RECEIVE:
 337                 if (sc->ic_xfercnt >= sc->ic_ifp->if_mtu+ICHDRLEN) {
 338                         sc->ic_iferrs ++;
 339
 340                 } else {
 341                         *sc->ic_cp++ = *ptr;
 342                         sc->ic_xfercnt ++;
 343                 }
 344                 break;
 345
 346         case INTR_NOACK:                        /* xfer terminated by master */
 347                 break;
 348
 349         case INTR_TRANSMIT:
 350                 *ptr = 0xff;                                    /* XXX */
 351                 break;
 352
 353         case INTR_ERROR:
 354                 sc->ic_iferrs ++;
 355                 break;
 356
 357         default:
 358                 panic("%s: unknown event (%d)!", __func__, event);
 359         }
 360
 361         splx(s);
 362         return;
 363 }
 364
 365 /*
 366  * icoutput()
 367  */
 368 static int
 369 icoutput(struct ifnet *ifp, struct mbuf *m,
 370         struct sockaddr *dst, struct rtentry *rt)
 371 {
 372         device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
 373         device_t parent = device_get_parent(icdev);
 374         struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
 375
 376         int s, len, sent;
 377         struct mbuf *mm;
 378         u_char *cp;
 379         u_int32_t hdr;
 380
 381         /* BPF writes need to be handled specially. */
 382         if (dst->sa_family == AF_UNSPEC)
 383                 bcopy(dst->sa_data, &hdr, sizeof(hdr));
 384         else
 385                 hdr = dst->sa_family;
 386
 387         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 388
 389         s = splhigh();
 390
 391         /* already sending? */
 392         if (sc->ic_sending) {
 393                 ifp->if_oerrors ++;
 394                 goto error;
 395         }
 396
 397         /* insert header */
 398         bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN);
 399
 400         cp = sc->ic_obuf + ICHDRLEN;
 401         len = 0;
 402         mm = m;
 403         do {
 404                 if (len + mm->m_len > sc->ic_ifp->if_mtu) {
 405                         /* packet to large */
 406                         ifp->if_oerrors ++;
 407                         goto error;
 408                 }
 409
 410                 bcopy(mtod(mm,char *), cp, mm->m_len);
 411                 cp += mm->m_len;
 412                 len += mm->m_len;
 413
 414         } while ((mm = mm->m_next));
 415
 416         BPF_MTAP2(ifp, &hdr, sizeof(hdr), m);
 417
 418         sc->ic_sending = 1;
 419
 420         m_freem(m);
 421         splx(s);
 422
 423         /* send the packet */
 424         if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf,
 425                                 len + ICHDRLEN, &sent))
 426
 427                 ifp->if_oerrors ++;
 428         else {
 429                 ifp->if_opackets ++;
 430                 ifp->if_obytes += len;
 431         }
 432
 433         sc->ic_sending = 0;
 434
 435         return (0);
 436
 437 error:
 438         m_freem(m);
 439         splx(s);
 440
 441         return(0);
 442 }
 443
 444 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0);
 445 MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
 446 MODULE_VERSION(ic, 1);