sys/dev/netif/el/if_el.c

   1 /* Copyright (c) 1994, Matthew E. Kimmel.  Permission is hereby granted
   2  * to use, copy, modify and distribute this software provided that both
   3  * the copyright notice and this permission notice appear in all copies
   4  * of the software, derivative works or modified versions, and any
   5  * portions thereof.
   6  *
   7  * Questions, comments, bug reports and fixes to kimmel@cs.umass.edu.
   8  *
   9  * $FreeBSD: src/sys/i386/isa/if_el.c,v 1.47.2.2 2000/07/17 21:24:30 archie Exp $
  10  * $DragonFly: src/sys/dev/netif/el/if_el.c,v 1.14 2005/05/27 15:36:09 joerg Exp $
  11  */
  12 /* Except of course for the portions of code lifted from other FreeBSD
  13  * drivers (mainly elread, elget and el_ioctl)
  14  */
  15 /* 3COM Etherlink 3C501 device driver for FreeBSD */
  16 /* Yeah, I know these cards suck, but you can also get them for free
  17  * really easily...
  18  */
  19 /* Bugs/possible improvements:
  20  *      - Does not currently support DMA
  21  *      - Does not currently support multicasts
  22  */
  23 #include "use_el.h"
  24 #include "opt_inet.h"
  25 #include "opt_ipx.h"
  26
  27 #include <sys/param.h>
  28 #include <sys/systm.h>
  29 #include <sys/sockio.h>
  30 #include <sys/mbuf.h>
  31 #include <sys/socket.h>
  32 #include <sys/syslog.h>
  33 #include <sys/linker_set.h>
  34 #include <sys/module.h>
  35
  36 #include <net/ethernet.h>
  37 #include <net/if.h>
  38 #include <net/ifq_var.h>
  39
  40 #include <netinet/in.h>
  41 #include <netinet/if_ether.h>
  42
  43 #include <net/bpf.h>
  44
  45 #include <machine/clock.h>
  46
  47 #include <bus/isa/i386/isa_device.h>
  48 #include "if_elreg.h"
  49
  50 DECLARE_DUMMY_MODULE(if_el);
  51
  52 /* For debugging convenience */
  53 #ifdef EL_DEBUG
  54 #define dprintf(x) printf x
  55 #else
  56 #define dprintf(x)
  57 #endif
  58
  59 /* el_softc: per line info and status */
  60 static struct el_softc {
  61         struct arpcom arpcom;   /* Ethernet common */
  62         u_short el_base;        /* Base I/O addr */
  63         char el_pktbuf[EL_BUFSIZ];      /* Frame buffer */
  64 } el_softc[NEL];
  65
  66 /* Prototypes */
  67 static int el_attach(struct isa_device *);
  68 static void el_init(void *);
  69 static int el_ioctl(struct ifnet *, u_long, caddr_t, struct ucred *);
  70 static int el_probe(struct isa_device *);
  71 static void el_start(struct ifnet *);
  72 static void el_reset(void *);
  73 static void el_watchdog(struct ifnet *);
  74
  75 static void el_stop(void *);
  76 static int el_xmit(struct el_softc *,int);
  77 static ointhand2_t elintr;
  78 static __inline void elread(struct el_softc *,caddr_t,int);
  79 static struct mbuf *elget(caddr_t,int,struct ifnet *);
  80 static __inline void el_hardreset(void *);
  81
  82 /* isa_driver structure for autoconf */
  83 struct isa_driver eldriver = {
  84         el_probe, el_attach, "el"
  85 };
  86
  87 /* Probe routine.  See if the card is there and at the right place. */
  88 static int
  89 el_probe(struct isa_device *idev)
  90 {
  91         struct el_softc *sc;
  92         u_short base; /* Just for convenience */
  93         u_char station_addr[ETHER_ADDR_LEN];
  94         int i;
  95
  96         /* Grab some info for our structure */
  97         sc = &el_softc[idev->id_unit];
  98         sc->el_base = idev->id_iobase;
  99         base = sc->el_base;
 100
 101         /* First check the base */
 102         if((base < 0x280) || (base > 0x3f0)) {
 103                 printf("el%d: ioaddr must be between 0x280 and 0x3f0\n",
 104                         idev->id_unit);
 105                 return(0);
 106         }
 107
 108         /* Now attempt to grab the station address from the PROM
 109          * and see if it contains the 3com vendor code.
 110          */
 111         dprintf(("Probing 3c501 at 0x%x...\n",base));
 112
 113         /* Reset the board */
 114         dprintf(("Resetting board...\n"));
 115         outb(base+EL_AC,EL_AC_RESET);
 116         DELAY(5);
 117         outb(base+EL_AC,0);
 118         dprintf(("Reading station address...\n"));
 119         /* Now read the address */
 120         for(i=0;i<ETHER_ADDR_LEN;i++) {
 121                 outb(base+EL_GPBL,i);
 122                 station_addr[i] = inb(base+EL_EAW);
 123         }
 124         dprintf(("Address is %6D\n",station_addr, ":"));
 125
 126         /* If the vendor code is ok, return a 1.  We'll assume that
 127          * whoever configured this system is right about the IRQ.
 128          */
 129         if((station_addr[0] != 0x02) || (station_addr[1] != 0x60)
 130            || (station_addr[2] != 0x8c)) {
 131                 dprintf(("Bad vendor code.\n"));
 132                 return(0);
 133         } else {
 134                 dprintf(("Vendor code ok.\n"));
 135                 /* Copy the station address into the arpcom structure */
 136                 bcopy(station_addr,sc->arpcom.ac_enaddr,ETHER_ADDR_LEN);
 137                 return(1);
 138         }
 139 }
 140
 141 /* Do a hardware reset of the 3c501.  Do not call until after el_probe()! */
 142 static __inline void
 143 el_hardreset(xsc)
 144         void *xsc;
 145 {
 146         struct el_softc *sc = xsc;
 147         int base;
 148         int j;
 149
 150         base = sc->el_base;
 151
 152         /* First reset the board */
 153         outb(base+EL_AC,EL_AC_RESET);
 154         DELAY(5);
 155         outb(base+EL_AC,0);
 156
 157         /* Then give it back its ethernet address.  Thanks to the mach
 158          * source code for this undocumented goodie...
 159          */
 160         for(j=0;j<ETHER_ADDR_LEN;j++)
 161                 outb(base+j,sc->arpcom.ac_enaddr[j]);
 162 }
 163
 164 /* Attach the interface to the kernel data structures.  By the time
 165  * this is called, we know that the card exists at the given I/O address.
 166  * We still assume that the IRQ given is correct.
 167  */
 168 static int
 169 el_attach(struct isa_device *idev)
 170 {
 171         struct el_softc *sc;
 172         struct ifnet *ifp;
 173         u_short base;
 174
 175         dprintf(("Attaching el%d...\n",idev->id_unit));
 176
 177         /* Get things pointing to the right places. */
 178         idev->id_ointr = elintr;
 179         sc = &el_softc[idev->id_unit];
 180         ifp = &sc->arpcom.ac_if;
 181         base = sc->el_base;
 182
 183         /* Now reset the board */
 184         dprintf(("Resetting board...\n"));
 185         el_hardreset(sc);
 186
 187         /* Initialize ifnet structure */
 188         ifp->if_softc = sc;
 189         if_initname(ifp, "el", idev->id_unit);
 190         ifp->if_mtu = ETHERMTU;
 191         ifp->if_start = el_start;
 192         ifp->if_ioctl = el_ioctl;
 193         ifp->if_watchdog = el_watchdog;
 194         ifp->if_init = el_init;
 195         ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX);
 196         ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN);
 197         ifq_set_ready(&ifp->if_snd);
 198
 199         /* Now we can attach the interface */
 200         dprintf(("Attaching interface...\n"));
 201         ether_ifattach(ifp, sc->arpcom.ac_enaddr);
 202
 203         dprintf(("el_attach() finished.\n"));
 204         return(1);
 205 }
 206
 207 /* This routine resets the interface. */
 208 static void
 209 el_reset(xsc)
 210         void *xsc;
 211 {
 212         struct el_softc *sc = xsc;
 213         int s;
 214
 215         dprintf(("elreset()\n"));
 216         s = splimp();
 217         el_stop(sc);
 218         el_init(sc);
 219         splx(s);
 220 }
 221
 222 static void el_stop(xsc)
 223         void *xsc;
 224 {
 225         struct el_softc *sc = xsc;
 226
 227         outb(sc->el_base+EL_AC,0);
 228 }
 229
 230 /* Initialize interface.  */
 231 static void
 232 el_init(xsc)
 233         void *xsc;
 234 {
 235         struct el_softc *sc = xsc;
 236         struct ifnet *ifp;
 237         int s;
 238         u_short base;
 239
 240         /* Set up pointers */
 241         ifp = &sc->arpcom.ac_if;
 242         base = sc->el_base;
 243
 244         /* If address not known, do nothing. */
 245         if(TAILQ_EMPTY(&ifp->if_addrhead)) /* XXX unlikely */
 246                 return;
 247
 248         s = splimp();
 249
 250         /* First, reset the board. */
 251         dprintf(("Resetting board...\n"));
 252         el_hardreset(sc);
 253
 254         /* Configure rx */
 255         dprintf(("Configuring rx...\n"));
 256         if(ifp->if_flags & IFF_PROMISC)
 257                 outb(base+EL_RXC,(EL_RXC_PROMISC|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
 258         else
 259                 outb(base+EL_RXC,(EL_RXC_ABROAD|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
 260         outb(base+EL_RBC,0);
 261
 262         /* Configure TX */
 263         dprintf(("Configuring tx...\n"));
 264         outb(base+EL_TXC,0);
 265
 266         /* Start reception */
 267         dprintf(("Starting reception...\n"));
 268         outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
 269
 270         /* Set flags appropriately */
 271         ifp->if_flags |= IFF_RUNNING;
 272         ifp->if_flags &= ~IFF_OACTIVE;
 273
 274         /* And start output. */
 275         el_start(ifp);
 276
 277         splx(s);
 278 }
 279
 280 /* Start output on interface.  Get datagrams from the queue and output
 281  * them, giving the receiver a chance between datagrams.  Call only
 282  * from splimp or interrupt level!
 283  */
 284 static void
 285 el_start(struct ifnet *ifp)
 286 {
 287         struct el_softc *sc;
 288         u_short base;
 289         struct mbuf *m, *m0;
 290         int s, i, len, retries, done;
 291
 292         /* Get things pointing in the right directions */
 293         sc = ifp->if_softc;
 294         base = sc->el_base;
 295
 296         dprintf(("el_start()...\n"));
 297         s = splimp();
 298
 299         /* Don't do anything if output is active */
 300         if(sc->arpcom.ac_if.if_flags & IFF_OACTIVE)
 301                 return;
 302         sc->arpcom.ac_if.if_flags |= IFF_OACTIVE;
 303
 304         /* The main loop.  They warned me against endless loops, but
 305          * would I listen?  NOOO....
 306          */
 307         while(1) {
 308                 /* Dequeue the next datagram */
 309                 m0 = ifq_dequeue(&ifp->if_snd);
 310
 311                 /* If there's nothing to send, return. */
 312                 if(m0 == NULL) {
 313                         sc->arpcom.ac_if.if_flags &= ~IFF_OACTIVE;
 314                         splx(s);
 315                         return;
 316                 }
 317
 318                 /* Disable the receiver */
 319                 outb(base+EL_AC,EL_AC_HOST);
 320                 outb(base+EL_RBC,0);
 321
 322                 /* Copy the datagram to the buffer. */
 323                 len = 0;
 324                 for(m = m0; m != NULL; m = m->m_next) {
 325                         if(m->m_len == 0)
 326                                 continue;
 327                         bcopy(mtod(m,caddr_t),sc->el_pktbuf+len,m->m_len);
 328                         len += m->m_len;
 329                 }
 330                 m_freem(m0);
 331
 332                 len = max(len,ETHER_MIN_LEN);
 333
 334                 BPF_TAP(&sc->arpcom.ac_if, sc->el_pktbuf, len);
 335
 336                 /* Transfer datagram to board */
 337                 dprintf(("el: xfr pkt length=%d...\n",len));
 338                 i = EL_BUFSIZ - len;
 339                 outb(base+EL_GPBL,(i & 0xff));
 340                 outb(base+EL_GPBH,((i>>8)&0xff));
 341                 outsb(base+EL_BUF,sc->el_pktbuf,len);
 342
 343                 /* Now transmit the datagram */
 344                 retries=0;
 345                 done=0;
 346                 while(!done) {
 347                         if(el_xmit(sc,len)) { /* Something went wrong */
 348                                 done = -1;
 349                                 break;
 350                         }
 351                         /* Check out status */
 352                         i = inb(base+EL_TXS);
 353                         dprintf(("tx status=0x%x\n",i));
 354                         if(!(i & EL_TXS_READY)) {
 355                                 dprintf(("el: err txs=%x\n",i));
 356                                 sc->arpcom.ac_if.if_oerrors++;
 357                                 if(i & (EL_TXS_COLL|EL_TXS_COLL16)) {
 358                                         if((!(i & EL_TXC_DCOLL16)) && retries < 15) {
 359                                                 retries++;
 360                                                 outb(base+EL_AC,EL_AC_HOST);
 361                                         }
 362                                 }
 363                                 else
 364                                         done = 1;
 365                         }
 366                         else {
 367                                 sc->arpcom.ac_if.if_opackets++;
 368                                 done = 1;
 369                         }
 370                 }
 371                 if(done == -1)  /* Packet not transmitted */
 372                         continue;
 373
 374                 /* Now give the card a chance to receive.
 375                  * Gotta love 3c501s...
 376                  */
 377                 (void)inb(base+EL_AS);
 378                 outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
 379                 splx(s);
 380                 /* Interrupt here */
 381                 s = splimp();
 382         }
 383 }
 384
 385 /* This function actually attempts to transmit a datagram downloaded
 386  * to the board.  Call at splimp or interrupt, after downloading data!
 387  * Returns 0 on success, non-0 on failure
 388  */
 389 static int
 390 el_xmit(struct el_softc *sc,int len)
 391 {
 392         int gpl;
 393         int i;
 394
 395         gpl = EL_BUFSIZ - len;
 396         dprintf(("el: xmit..."));
 397         outb((sc->el_base)+EL_GPBL,(gpl & 0xff));
 398         outb((sc->el_base)+EL_GPBH,((gpl>>8)&0xff));
 399         outb((sc->el_base)+EL_AC,EL_AC_TXFRX);
 400         i = 20000;
 401         while((inb((sc->el_base)+EL_AS) & EL_AS_TXBUSY) && (i>0))
 402                 i--;
 403         if(i == 0) {
 404                 dprintf(("tx not ready\n"));
 405                 sc->arpcom.ac_if.if_oerrors++;
 406                 return(-1);
 407         }
 408         dprintf(("%d cycles.\n",(20000-i)));
 409         return(0);
 410 }
 411
 412 /* Pass a packet up to the higher levels. */
 413 static __inline void
 414 elread(struct el_softc *sc,caddr_t buf,int len)
 415 {
 416         struct ether_header *eh;
 417         struct mbuf *m;
 418
 419         eh = (struct ether_header *)buf;
 420
 421         /*
 422          * Put packet into an mbuf chain
 423          */
 424         m = elget(buf,len,&sc->arpcom.ac_if);
 425         if(m == 0)
 426                 return;
 427
 428         ether_input(&sc->arpcom.ac_if,eh,m);
 429 }
 430
 431 /* controller interrupt */
 432 static void
 433 elintr(int unit)
 434 {
 435         struct el_softc *sc;
 436         int base;
 437         int stat, rxstat, len, done;
 438
 439         /* Get things pointing properly */
 440         sc = &el_softc[unit];
 441         base = sc->el_base;
 442
 443         dprintf(("elintr: "));
 444
 445         /* Check board status */
 446         stat = inb(base+EL_AS);
 447         if(stat & EL_AS_RXBUSY) {
 448                 (void)inb(base+EL_RXC);
 449                 outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
 450                 return;
 451         }
 452
 453         done = 0;
 454         while(!done) {
 455                 rxstat = inb(base+EL_RXS);
 456                 if(rxstat & EL_RXS_STALE) {
 457                         (void)inb(base+EL_RXC);
 458                         outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
 459                         return;
 460                 }
 461
 462                 /* If there's an overflow, reinit the board. */
 463                 if(!(rxstat & EL_RXS_NOFLOW)) {
 464                         dprintf(("overflow.\n"));
 465                         el_hardreset(sc);
 466                         /* Put board back into receive mode */
 467                         if(sc->arpcom.ac_if.if_flags & IFF_PROMISC)
 468                                 outb(base+EL_RXC,(EL_RXC_PROMISC|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
 469                         else
 470                                 outb(base+EL_RXC,(EL_RXC_ABROAD|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
 471                         (void)inb(base+EL_AS);
 472                         outb(base+EL_RBC,0);
 473                         (void)inb(base+EL_RXC);
 474                         outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
 475                         return;
 476                 }
 477
 478                 /* Incoming packet */
 479                 len = inb(base+EL_RBL);
 480                 len |= inb(base+EL_RBH) << 8;
 481                 dprintf(("receive len=%d rxstat=%x ",len,rxstat));
 482                 outb(base+EL_AC,EL_AC_HOST);
 483
 484                 /* If packet too short or too long, restore rx mode and return
 485                  */
 486                 if((len <= sizeof(struct ether_header)) || (len > ETHER_MAX_LEN)) {
 487                         if(sc->arpcom.ac_if.if_flags & IFF_PROMISC)
 488                                 outb(base+EL_RXC,(EL_RXC_PROMISC|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
 489                         else
 490                                 outb(base+EL_RXC,(EL_RXC_ABROAD|EL_RXC_AGF|EL_RXC_DSHORT|EL_RXC_DDRIB|EL_RXC_DOFLOW));
 491                         (void)inb(base+EL_AS);
 492                         outb(base+EL_RBC,0);
 493                         (void)inb(base+EL_RXC);
 494                         outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
 495                         return;
 496                 }
 497
 498                 sc->arpcom.ac_if.if_ipackets++;
 499
 500                 /* Copy the data into our buffer */
 501                 outb(base+EL_GPBL,0);
 502                 outb(base+EL_GPBH,0);
 503                 insb(base+EL_BUF,sc->el_pktbuf,len);
 504                 outb(base+EL_RBC,0);
 505                 outb(base+EL_AC,EL_AC_RX);
 506                 dprintf(("%6D-->",sc->el_pktbuf+6,":"));
 507                 dprintf(("%6D\n",sc->el_pktbuf,":"));
 508
 509                 /* Pass data up to upper levels */
 510                 len -= sizeof(struct ether_header);
 511                 elread(sc,(caddr_t)(sc->el_pktbuf),len);
 512
 513                 /* Is there another packet? */
 514                 stat = inb(base+EL_AS);
 515
 516                 /* If so, do it all again (i.e. don't set done to 1) */
 517                 if(!(stat & EL_AS_RXBUSY))
 518                         dprintf(("<rescan> "));
 519                 else
 520                         done = 1;
 521         }
 522
 523         (void)inb(base+EL_RXC);
 524         outb(base+EL_AC,(EL_AC_IRQE|EL_AC_RX));
 525         return;
 526 }
 527
 528 /*
 529  * Pull read data off a interface.
 530  * Len is length of data, with local net header stripped.
 531  */
 532 static struct mbuf *
 533 elget(buf, totlen, ifp)
 534         caddr_t buf;
 535         int totlen;
 536         struct ifnet *ifp;
 537 {
 538         struct mbuf *top, **mp, *m;
 539         int len;
 540         caddr_t cp;
 541         char *epkt;
 542
 543         buf += sizeof(struct ether_header);
 544         cp = buf;
 545         epkt = cp + totlen;
 546
 547         MGETHDR(m, MB_DONTWAIT, MT_DATA);
 548         if (m == 0)
 549                 return (0);
 550         m->m_pkthdr.rcvif = ifp;
 551         m->m_pkthdr.len = totlen;
 552         m->m_len = MHLEN;
 553         top = 0;
 554         mp = &top;
 555         while (totlen > 0) {
 556                 if (top) {
 557                         MGET(m, MB_DONTWAIT, MT_DATA);
 558                         if (m == 0) {
 559                                 m_freem(top);
 560                                 return (0);
 561                         }
 562                         m->m_len = MLEN;
 563                 }
 564                 len = min(totlen, epkt - cp);
 565                 if (len >= MINCLSIZE) {
 566                         MCLGET(m, MB_DONTWAIT);
 567                         if (m->m_flags & M_EXT)
 568                                 m->m_len = len = min(len, MCLBYTES);
 569                         else
 570                                 len = m->m_len;
 571                 } else {
 572                         /*
 573                          * Place initial small packet/header at end of mbuf.
 574                          */
 575                         if (len < m->m_len) {
 576                                 if (top == 0 && len + max_linkhdr <= m->m_len)
 577                                         m->m_data += max_linkhdr;
 578                                 m->m_len = len;
 579                         } else
 580                                 len = m->m_len;
 581                 }
 582                 bcopy(cp, mtod(m, caddr_t), (unsigned)len);
 583                 cp += len;
 584                 *mp = m;
 585                 mp = &m->m_next;
 586                 totlen -= len;
 587                 if (cp == epkt)
 588                         cp = buf;
 589         }
 590         return (top);
 591 }
 592
 593 /*
 594  * Process an ioctl request. This code needs some work - it looks
 595  *      pretty ugly.
 596  */
 597 static int
 598 el_ioctl(struct ifnet *ifp, u_long command, caddr_t data, struct ucred *cr)
 599 {
 600         int s, error = 0;
 601
 602         s = splimp();
 603
 604         switch (command) {
 605         case SIOCSIFFLAGS:
 606                 /*
 607                  * If interface is marked down and it is running, then stop it
 608                  */
 609                 if (((ifp->if_flags & IFF_UP) == 0) &&
 610                     (ifp->if_flags & IFF_RUNNING)) {
 611                         el_stop(ifp->if_softc);
 612                         ifp->if_flags &= ~IFF_RUNNING;
 613                 } else {
 614                 /*
 615                  * If interface is marked up and it is stopped, then start it
 616                  */
 617                         if ((ifp->if_flags & IFF_UP) &&
 618                             ((ifp->if_flags & IFF_RUNNING) == 0))
 619                                 el_init(ifp->if_softc);
 620                 }
 621                 break;
 622         default:
 623                 error = ether_ioctl(ifp, command, data);
 624                 break;
 625         }
 626         (void) splx(s);
 627         return (error);
 628 }
 629
 630 /* Device timeout routine */
 631 static void
 632 el_watchdog(struct ifnet *ifp)
 633 {
 634         log(LOG_ERR,"%s: device timeout\n", ifp->if_xname);
 635         ifp->if_oerrors++;
 636         el_reset(ifp->if_softc);
 637 }