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         sc->ic_addr = PCF_MASTER_ADDRESS;       /* XXX only PCF masters */
 139
 140         ifp->if_softc = sc;
 141         if_initname(ifp, device_get_name(dev), device_get_unit(dev));
 142         ifp->if_mtu = ICMTU;
 143         ifp->if_flags = IFF_SIMPLEX | IFF_POINTOPOINT | IFF_MULTICAST |
 144             IFF_NEEDSGIANT;
 145         ifp->if_ioctl = icioctl;
 146         ifp->if_output = icoutput;
 147         ifp->if_hdrlen = 0;
 148         ifp->if_addrlen = 0;
 149         ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
 150
 151         if_attach(ifp);
 152
 153         bpfattach(ifp, DLT_NULL, ICHDRLEN);
 154
 155         return (0);
 156 }
 157
 158 /*
 159  * iciotcl()
 160  */
 161 static int
 162 icioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
 163 {
 164         device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
 165         device_t parent = device_get_parent(icdev);
 166         struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
 167
 168         struct ifaddr *ifa = (struct ifaddr *)data;
 169         struct ifreq *ifr = (struct ifreq *)data;
 170
 171         u_char *iptr, *optr;
 172         int error;
 173
 174         switch (cmd) {
 175
 176         case SIOCSIFDSTADDR:
 177         case SIOCAIFADDR:
 178         case SIOCSIFADDR:
 179                 if (ifa->ifa_addr->sa_family != AF_INET)
 180                         return (EAFNOSUPPORT);
 181                 ifp->if_flags |= IFF_UP;
 182                 /* FALLTHROUGH */
 183         case SIOCSIFFLAGS:
 184                 if ((!(ifp->if_flags & IFF_UP)) &&
 185                     (ifp->if_drv_flags & IFF_DRV_RUNNING)) {
 186
 187                         /* XXX disable PCF */
 188                         ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
 189
 190                         /* IFF_UP is not set, try to release the bus anyway */
 191                         iicbus_release_bus(parent, icdev);
 192                         break;
 193                 }
 194                 if (((ifp->if_flags & IFF_UP)) &&
 195                     (!(ifp->if_drv_flags & IFF_DRV_RUNNING))) {
 196                         if ((error = iicbus_request_bus(parent, icdev,
 197                             IIC_WAIT | IIC_INTR)))
 198                                 return (error);
 199                         sc->ic_obuf = malloc(sc->ic_ifp->if_mtu + ICHDRLEN,
 200                             M_DEVBUF, M_WAITOK);
 201                         if (!sc->ic_obuf) {
 202                                 iicbus_release_bus(parent, icdev);
 203                                 return (ENOBUFS);
 204                         }
 205                         sc->ic_ifbuf = malloc(sc->ic_ifp->if_mtu + ICHDRLEN,
 206                             M_DEVBUF, M_WAITOK);
 207                         if (!sc->ic_ifbuf) {
 208                                 iicbus_release_bus(parent, icdev);
 209                                 return (ENOBUFS);
 210                         }
 211                         iicbus_reset(parent, IIC_FASTEST, 0, NULL);
 212                         ifp->if_drv_flags |= IFF_DRV_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_NOWAIT);
 223                 if (!sc->ic_ifbuf) {
 224                         sc->ic_ifbuf = iptr;
 225                         sc->ic_obuf = optr;
 226                         return (ENOBUFS);
 227                 }
 228
 229                 /* allocate output buffer */
 230                 sc->ic_ifbuf = malloc(ifr->ifr_mtu+ICHDRLEN, M_DEVBUF, M_NOWAIT);
 231                 if (!sc->ic_obuf) {
 232                         free(sc->ic_ifbuf,M_DEVBUF);
 233                         sc->ic_ifbuf = iptr;
 234                         sc->ic_obuf = optr;
 235                         return (ENOBUFS);
 236                 }
 237
 238                 if (iptr)
 239                         free(iptr,M_DEVBUF);
 240                 if (optr)
 241                         free(optr,M_DEVBUF);
 242                 sc->ic_ifp->if_mtu = ifr->ifr_mtu;
 243                 break;
 244
 245         case SIOCGIFMTU:
 246                 ifr->ifr_mtu = sc->ic_ifp->if_mtu;
 247                 break;
 248
 249         case SIOCADDMULTI:
 250         case SIOCDELMULTI:
 251                 if (ifr == 0)
 252                         return (EAFNOSUPPORT);          /* XXX */
 253                 switch (ifr->ifr_addr.sa_family) {
 254                 case AF_INET:
 255                         break;
 256                 default:
 257                         return (EAFNOSUPPORT);
 258                 }
 259                 break;
 260         default:
 261                 return (EINVAL);
 262         }
 263         return (0);
 264 }
 265
 266 /*
 267  * icintr()
 268  */
 269 static void
 270 icintr(device_t dev, int event, char *ptr)
 271 {
 272         struct ic_softc *sc = (struct ic_softc *)device_get_softc(dev);
 273         int unit = device_get_unit(dev);
 274         int s, len;
 275         struct mbuf *top;
 276
 277         s = splhigh();
 278
 279         switch (event) {
 280
 281         case INTR_GENERAL:
 282         case INTR_START:
 283                 sc->ic_cp = sc->ic_ifbuf;
 284                 sc->ic_xfercnt = 0;
 285                 break;
 286
 287         case INTR_STOP:
 288
 289                 /* if any error occured during transfert,
 290                  * drop the packet */
 291                 if (sc->ic_iferrs)
 292                         goto err;
 293                 if ((len = sc->ic_xfercnt) == 0)
 294                         break;                                  /* ignore */
 295                 if (len <= ICHDRLEN)
 296                         goto err;
 297                 len -= ICHDRLEN;
 298                 sc->ic_ifp->if_ipackets++;
 299                 sc->ic_ifp->if_ibytes += len;
 300                 BPF_TAP(sc->ic_ifp, sc->ic_ifbuf, len + ICHDRLEN);
 301                 top = m_devget(sc->ic_ifbuf + ICHDRLEN, len, 0, sc->ic_ifp, 0);
 302                 if (top)
 303                         netisr_dispatch(NETISR_IP, top);
 304                 break;
 305         err:
 306                 printf("ic%d: errors (%d)!\n", unit, sc->ic_iferrs);
 307                 sc->ic_iferrs = 0;                      /* reset error count */
 308                 sc->ic_ifp->if_ierrors++;
 309                 break;
 310
 311         case INTR_RECEIVE:
 312                 if (sc->ic_xfercnt >= sc->ic_ifp->if_mtu+ICHDRLEN) {
 313                         sc->ic_iferrs++;
 314                 } else {
 315                         *sc->ic_cp++ = *ptr;
 316                         sc->ic_xfercnt++;
 317                 }
 318                 break;
 319
 320         case INTR_NOACK:                        /* xfer terminated by master */
 321                 break;
 322
 323         case INTR_TRANSMIT:
 324                 *ptr = 0xff;                                    /* XXX */
 325                 break;
 326
 327         case INTR_ERROR:
 328                 sc->ic_iferrs++;
 329                 break;
 330
 331         default:
 332                 panic("%s: unknown event (%d)!", __func__, event);
 333         }
 334
 335         splx(s);
 336         return;
 337 }
 338
 339 /*
 340  * icoutput()
 341  */
 342 static int
 343 icoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
 344     struct rtentry *rt)
 345 {
 346         device_t icdev = devclass_get_device(ic_devclass, ifp->if_dunit);
 347         device_t parent = device_get_parent(icdev);
 348         struct ic_softc *sc = (struct ic_softc *)device_get_softc(icdev);
 349
 350         int s, len, sent;
 351         struct mbuf *mm;
 352         u_char *cp;
 353         u_int32_t hdr;
 354
 355         /* BPF writes need to be handled specially. */
 356         if (dst->sa_family == AF_UNSPEC)
 357                 bcopy(dst->sa_data, &hdr, sizeof(hdr));
 358         else
 359                 hdr = dst->sa_family;
 360
 361         ifp->if_drv_flags |= IFF_DRV_RUNNING;
 362
 363         s = splhigh();
 364
 365         /* already sending? */
 366         if (sc->ic_sending) {
 367                 ifp->if_oerrors++;
 368                 goto error;
 369         }
 370
 371         /* insert header */
 372         bcopy ((char *)&hdr, sc->ic_obuf, ICHDRLEN);
 373
 374         cp = sc->ic_obuf + ICHDRLEN;
 375         len = 0;
 376         mm = m;
 377         do {
 378                 if (len + mm->m_len > sc->ic_ifp->if_mtu) {
 379                         /* packet to large */
 380                         ifp->if_oerrors++;
 381                         goto error;
 382                 }
 383
 384                 bcopy(mtod(mm,char *), cp, mm->m_len);
 385                 cp += mm->m_len;
 386                 len += mm->m_len;
 387
 388         } while ((mm = mm->m_next));
 389
 390         BPF_MTAP2(ifp, &hdr, sizeof(hdr), m);
 391
 392         sc->ic_sending = 1;
 393
 394         m_freem(m);
 395         splx(s);
 396
 397         /* send the packet */
 398         if (iicbus_block_write(parent, sc->ic_addr, sc->ic_obuf,
 399                                 len + ICHDRLEN, &sent))
 400
 401                 ifp->if_oerrors++;
 402         else {
 403                 ifp->if_opackets++;
 404                 ifp->if_obytes += len;
 405         }
 406
 407         sc->ic_sending = 0;
 408
 409         return (0);
 410
 411 error:
 412         m_freem(m);
 413         splx(s);
 414
 415         return(0);
 416 }
 417
 418 DRIVER_MODULE(ic, iicbus, ic_driver, ic_devclass, 0, 0);
 419 MODULE_DEPEND(ic, iicbus, IICBUS_MINVER, IICBUS_PREFVER, IICBUS_MAXVER);
 420 MODULE_VERSION(ic, 1);