The Design and Implementation of the FreeBSD Operating System, Second Edition
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sys/dev/ic/am7990.c

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    1 /*      $OpenBSD: am7990.c,v 1.43 2008/11/28 02:44:17 brad Exp $        */
    2 /*      $NetBSD: am7990.c,v 1.22 1996/10/13 01:37:19 christos Exp $     */
    3 
    4 /*-
    5  * Copyright (c) 1995 Charles M. Hannum.  All rights reserved.
    6  * Copyright (c) 1992, 1993
    7  *      The Regents of the University of California.  All rights reserved.
    8  *
    9  * This code is derived from software contributed to Berkeley by
   10  * Ralph Campbell and Rick Macklem.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)if_le.c     8.2 (Berkeley) 11/16/93
   37  */
   38 
   39 #include "bpfilter.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/systm.h>
   43 #include <sys/mbuf.h> 
   44 #include <sys/syslog.h>
   45 #include <sys/socket.h>
   46 #include <sys/device.h>
   47 #include <sys/malloc.h>
   48 #include <sys/ioctl.h>
   49 #include <sys/errno.h>
   50 
   51 #include <net/if.h>
   52 #include <net/if_media.h>
   53 
   54 #ifdef INET
   55 #include <netinet/in.h>
   56 #include <netinet/if_ether.h>
   57 #include <netinet/in_systm.h>
   58 #include <netinet/in_var.h>
   59 #include <netinet/ip.h>
   60 #endif
   61 
   62 #if NBPFILTER > 0
   63 #include <net/bpf.h>
   64 #endif
   65 
   66 #include <dev/ic/am7990reg.h>
   67 #include <dev/ic/am7990var.h>
   68 
   69 #ifdef LEDEBUG
   70 void am7990_recv_print(struct am7990_softc *, int);
   71 void am7990_xmit_print(struct am7990_softc *, int);
   72 #endif
   73 
   74 integrate void am7990_rint(struct am7990_softc *);
   75 integrate void am7990_tint(struct am7990_softc *);
   76 
   77 integrate int am7990_put(struct am7990_softc *, int, struct mbuf *);
   78 integrate struct mbuf *am7990_get(struct am7990_softc *, int, int);
   79 integrate void am7990_read(struct am7990_softc *, int, int); 
   80 
   81 hide void am7990_shutdown(void *);
   82 
   83 #define ifp     (&sc->sc_arpcom.ac_if)
   84 
   85 #if 0   /* XXX what do we do about this?!  --thorpej */
   86 static inline u_int16_t ether_cmp(void *, void *);
   87 
   88 /*
   89  * Compare two Ether/802 addresses for equality, inlined and
   90  * unrolled for speed.  I'd love to have an inline assembler
   91  * version of this...   XXX: Who wanted that? mycroft?
   92  * I wrote one, but the following is just as efficient.
   93  * This expands to 10 short m68k instructions! -gwr
   94  * Note: use this like bcmp()
   95  */
   96 static inline u_short
   97 ether_cmp(one, two)
   98         void *one, *two;
   99 {
  100         register u_int16_t *a = (u_short *) one;
  101         register u_int16_t *b = (u_short *) two;
  102         register u_int16_t diff;
  103 
  104         diff  = *a++ - *b++;
  105         diff |= *a++ - *b++;
  106         diff |= *a++ - *b++;
  107 
  108         return (diff);
  109 }
  110 
  111 #define ETHER_CMP       ether_cmp
  112 #endif /* XXX */
  113 
  114 #ifndef ETHER_CMP
  115 #define ETHER_CMP(a, b) bcmp((a), (b), ETHER_ADDR_LEN)
  116 #endif
  117 
  118 /*
  119  * am7990 configuration driver.  Attachments are provided by
  120  * machine-dependent driver front-ends.
  121  */
  122 struct cfdriver le_cd = {
  123         NULL, "le", DV_IFNET
  124 };
  125 
  126 void
  127 am7990_config(sc)
  128         struct am7990_softc *sc;
  129 {
  130         int mem;
  131 
  132         /* Make sure the chip is stopped. */
  133         am7990_stop(sc);
  134 
  135         /* Initialize ifnet structure. */
  136         bcopy(sc->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);
  137         ifp->if_softc = sc;
  138         ifp->if_start = am7990_start;
  139         ifp->if_ioctl = am7990_ioctl;
  140         ifp->if_watchdog = am7990_watchdog;
  141         ifp->if_flags =
  142             IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST;
  143 #ifdef LANCE_REVC_BUG
  144         ifp->if_flags &= ~IFF_MULTICAST;
  145 #endif
  146         ifp->if_baudrate = IF_Mbps(10);
  147         IFQ_SET_READY(&ifp->if_snd);
  148 
  149         ifp->if_capabilities = IFCAP_VLAN_MTU;
  150 
  151         /* Attach the interface. */
  152         if_attach(ifp);
  153         ether_ifattach(ifp);
  154 
  155         if (sc->sc_memsize > 262144)
  156                 sc->sc_memsize = 262144;
  157 
  158         switch (sc->sc_memsize) {
  159         case 8192:
  160                 sc->sc_nrbuf = 4;
  161                 sc->sc_ntbuf = 1;
  162                 break;
  163         case 16384:
  164                 sc->sc_nrbuf = 8;
  165                 sc->sc_ntbuf = 2;
  166                 break;
  167         case 32768:
  168                 sc->sc_nrbuf = 16;
  169                 sc->sc_ntbuf = 4;
  170                 break;
  171         case 65536:
  172                 sc->sc_nrbuf = 32;
  173                 sc->sc_ntbuf = 8;
  174                 break;
  175         case 131072:
  176                 sc->sc_nrbuf = 64;
  177                 sc->sc_ntbuf = 16;
  178                 break;
  179         case 262144:
  180                 sc->sc_nrbuf = 128;
  181                 sc->sc_ntbuf = 32;
  182                 break;
  183         default:
  184                 panic("am7990_config: weird memory size %lu", sc->sc_memsize);
  185         }
  186 
  187         printf(": address %s\n", ether_sprintf(sc->sc_arpcom.ac_enaddr));
  188         printf("%s: %d receive buffers, %d transmit buffers\n",
  189             sc->sc_dev.dv_xname, sc->sc_nrbuf, sc->sc_ntbuf);
  190 
  191         sc->sc_sh = shutdownhook_establish(am7990_shutdown, sc);
  192         if (sc->sc_sh == NULL)
  193                 panic("am7990_config: can't establish shutdownhook");
  194 
  195         mem = 0;
  196         sc->sc_initaddr = mem;
  197         mem += sizeof(struct leinit);
  198         sc->sc_rmdaddr = mem;
  199         mem += sizeof(struct lermd) * sc->sc_nrbuf;
  200         sc->sc_tmdaddr = mem;
  201         mem += sizeof(struct letmd) * sc->sc_ntbuf;
  202         sc->sc_rbufaddr = mem;
  203         mem += ETHER_MAX_DIX_LEN * sc->sc_nrbuf;
  204         sc->sc_tbufaddr = mem;
  205         mem += ETHER_MAX_DIX_LEN * sc->sc_ntbuf;
  206 #ifdef notyet
  207         if (mem > ...)
  208                 panic(...);
  209 #endif
  210 }
  211 
  212 void
  213 am7990_reset(sc)
  214         struct am7990_softc *sc;
  215 {
  216         int s;
  217 
  218         s = splnet();
  219         am7990_init(sc);
  220         splx(s);
  221 }
  222 
  223 /*
  224  * Set up the initialization block and the descriptor rings.
  225  */
  226 void
  227 am7990_meminit(sc)
  228         register struct am7990_softc *sc;
  229 {
  230         u_long a;
  231         int bix;
  232         struct leinit init;
  233         struct lermd rmd;
  234         struct letmd tmd;
  235 
  236 #if NBPFILTER > 0
  237         if (ifp->if_flags & IFF_PROMISC)
  238                 init.init_mode = LE_MODE_NORMAL | LE_MODE_PROM;
  239         else
  240 #endif
  241                 init.init_mode = LE_MODE_NORMAL;
  242         init.init_padr[0] =
  243             (sc->sc_arpcom.ac_enaddr[1] << 8) | sc->sc_arpcom.ac_enaddr[0];
  244         init.init_padr[1] =
  245             (sc->sc_arpcom.ac_enaddr[3] << 8) | sc->sc_arpcom.ac_enaddr[2];
  246         init.init_padr[2] =
  247             (sc->sc_arpcom.ac_enaddr[5] << 8) | sc->sc_arpcom.ac_enaddr[4];
  248         am7990_setladrf(&sc->sc_arpcom, init.init_ladrf);
  249 
  250         sc->sc_last_rd = 0;
  251         sc->sc_first_td = sc->sc_last_td = sc->sc_no_td = 0;
  252 
  253         a = sc->sc_addr + LE_RMDADDR(sc, 0);
  254         init.init_rdra = a;
  255         init.init_rlen = (a >> 16) | ((ffs(sc->sc_nrbuf) - 1) << 13);
  256 
  257         a = sc->sc_addr + LE_TMDADDR(sc, 0);
  258         init.init_tdra = a;
  259         init.init_tlen = (a >> 16) | ((ffs(sc->sc_ntbuf) - 1) << 13);
  260 
  261         (*sc->sc_copytodesc)(sc, &init, LE_INITADDR(sc), sizeof(init));
  262 
  263         /*
  264          * Set up receive ring descriptors.
  265          */
  266         for (bix = 0; bix < sc->sc_nrbuf; bix++) {
  267                 a = sc->sc_addr + LE_RBUFADDR(sc, bix);
  268                 rmd.rmd0 = a;
  269                 rmd.rmd1_hadr = a >> 16;
  270                 rmd.rmd1_bits = LE_R1_OWN;
  271                 rmd.rmd2 = -ETHER_MAX_DIX_LEN | LE_XMD2_ONES;
  272                 rmd.rmd3 = 0;
  273                 (*sc->sc_copytodesc)(sc, &rmd, LE_RMDADDR(sc, bix),
  274                     sizeof(rmd));
  275         }
  276 
  277         /*
  278          * Set up transmit ring descriptors.
  279          */
  280         for (bix = 0; bix < sc->sc_ntbuf; bix++) {
  281                 a = sc->sc_addr + LE_TBUFADDR(sc, bix);
  282                 tmd.tmd0 = a;
  283                 tmd.tmd1_hadr = a >> 16;
  284                 tmd.tmd1_bits = 0;
  285                 tmd.tmd2 = 0 | LE_XMD2_ONES;
  286                 tmd.tmd3 = 0;
  287                 (*sc->sc_copytodesc)(sc, &tmd, LE_TMDADDR(sc, bix),
  288                     sizeof(tmd));
  289         }
  290 }
  291 
  292 void
  293 am7990_stop(sc)
  294         struct am7990_softc *sc;
  295 {
  296 
  297         (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP);
  298 }
  299 
  300 /*
  301  * Initialization of interface; set up initialization block
  302  * and transmit/receive descriptor rings.
  303  */
  304 void
  305 am7990_init(sc)
  306         register struct am7990_softc *sc;
  307 {
  308         register int timo;
  309         u_long a;
  310 
  311         (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_STOP);
  312         DELAY(100);
  313 
  314         /* Newer LANCE chips have a reset register */
  315         if (sc->sc_hwreset)
  316                 (*sc->sc_hwreset)(sc);
  317 
  318         /* Set the correct byte swapping mode, etc. */
  319         (*sc->sc_wrcsr)(sc, LE_CSR3, sc->sc_conf3);
  320 
  321         /* Set up LANCE init block. */
  322         am7990_meminit(sc);
  323 
  324         /* Give LANCE the physical address of its init block. */
  325         a = sc->sc_addr + LE_INITADDR(sc);
  326         (*sc->sc_wrcsr)(sc, LE_CSR1, a);
  327         (*sc->sc_wrcsr)(sc, LE_CSR2, a >> 16);
  328 
  329         /* Try to initialize the LANCE. */
  330         DELAY(100);
  331         (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INIT);
  332 
  333         /* Wait for initialization to finish. */
  334         for (timo = 100000; timo; timo--)
  335                 if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON)
  336                         break;
  337 
  338         if ((*sc->sc_rdcsr)(sc, LE_CSR0) & LE_C0_IDON) {
  339                 /* Start the LANCE. */
  340                 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA | LE_C0_STRT |
  341                     LE_C0_IDON);
  342                 ifp->if_flags |= IFF_RUNNING;
  343                 ifp->if_flags &= ~IFF_OACTIVE;
  344                 ifp->if_timer = 0;
  345                 am7990_start(ifp);
  346         } else
  347                 printf("%s: controller failed to initialize\n", sc->sc_dev.dv_xname);
  348         if (sc->sc_hwinit)
  349                 (*sc->sc_hwinit)(sc);
  350 }
  351 
  352 /*
  353  * Routine to copy from mbuf chain to transmit buffer in
  354  * network buffer memory.
  355  */
  356 integrate int
  357 am7990_put(sc, boff, m)
  358         struct am7990_softc *sc;
  359         int boff;
  360         register struct mbuf *m;
  361 {
  362         register struct mbuf *n;
  363         register int len, tlen = 0;
  364 
  365         for (; m; m = n) {
  366                 len = m->m_len;
  367                 if (len == 0) {
  368                         MFREE(m, n);
  369                         continue;
  370                 }
  371                 (*sc->sc_copytobuf)(sc, mtod(m, caddr_t), boff, len);
  372                 boff += len;
  373                 tlen += len;
  374                 MFREE(m, n);
  375         }
  376         if (tlen < LEMINSIZE) {
  377                 (*sc->sc_zerobuf)(sc, boff, LEMINSIZE - tlen);
  378                 tlen = LEMINSIZE;
  379         }
  380         return (tlen);
  381 }
  382 
  383 /*
  384  * Pull data off an interface.
  385  * Len is length of data, with local net header stripped.
  386  * We copy the data into mbufs.  When full cluster sized units are present
  387  * we copy into clusters.
  388  */
  389 integrate struct mbuf *
  390 am7990_get(sc, boff, totlen)
  391         struct am7990_softc *sc;
  392         int boff, totlen;
  393 {
  394         register struct mbuf *m;
  395         struct mbuf *top, **mp;
  396         int len, pad;
  397 
  398         MGETHDR(m, M_DONTWAIT, MT_DATA);
  399         if (m == 0)
  400                 return (0);
  401         m->m_pkthdr.rcvif = ifp;
  402         m->m_pkthdr.len = totlen;
  403         pad = ALIGN(sizeof(struct ether_header)) - sizeof(struct ether_header);
  404         m->m_data += pad;
  405         len = MHLEN - pad;
  406         top = 0;
  407         mp = &top;
  408 
  409         while (totlen > 0) {
  410                 if (top) {
  411                         MGET(m, M_DONTWAIT, MT_DATA);
  412                         if (m == 0) {
  413                                 m_freem(top);
  414                                 return 0;
  415                         }
  416                         len = MLEN;
  417                 }
  418                 if (totlen >= MINCLSIZE) {
  419                         MCLGET(m, M_DONTWAIT);
  420                         if (m->m_flags & M_EXT) {
  421                                 len = MCLBYTES;
  422                                 if (!top) {
  423                                         m->m_data += pad;
  424                                         len -= pad;
  425                                 }
  426                         }
  427                 }
  428                 m->m_len = len = min(totlen, len);
  429                 (*sc->sc_copyfrombuf)(sc, mtod(m, caddr_t), boff, len);
  430                 boff += len;
  431                 totlen -= len;
  432                 *mp = m;
  433                 mp = &m->m_next;
  434         }
  435 
  436         return (top);
  437 }
  438 
  439 /*
  440  * Pass a packet to the higher levels.
  441  */
  442 integrate void
  443 am7990_read(sc, boff, len)
  444         register struct am7990_softc *sc;
  445         int boff, len;
  446 {
  447         struct mbuf *m;
  448 #ifdef LANCE_REVC_BUG
  449         struct ether_header *eh;
  450 #endif
  451 
  452         if (len <= sizeof(struct ether_header) ||
  453             len > ETHERMTU + ETHER_VLAN_ENCAP_LEN + sizeof(struct ether_header)) {
  454 #ifdef LEDEBUG
  455                 printf("%s: invalid packet size %d; dropping\n",
  456                     sc->sc_dev.dv_xname, len);
  457 #endif
  458                 ifp->if_ierrors++;
  459                 return;
  460         }
  461 
  462         /* Pull packet off interface. */
  463         m = am7990_get(sc, boff, len);
  464         if (m == 0) {
  465                 ifp->if_ierrors++;
  466                 return;
  467         }
  468 
  469         ifp->if_ipackets++;
  470 
  471 #if NBPFILTER > 0
  472         /*
  473          * Check if there's a BPF listener on this interface.
  474          * If so, hand off the raw packet to BPF.
  475          */
  476         if (ifp->if_bpf)
  477                 bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_IN);
  478 #endif
  479 
  480 #ifdef LANCE_REVC_BUG
  481         /*
  482          * The old LANCE (Rev. C) chips have a bug which causes
  483          * garbage to be inserted in front of the received packet.
  484          * The work-around is to ignore packets with an invalid
  485          * destination address (garbage will usually not match).
  486          * Of course, this precludes multicast support...
  487          */
  488         eh = mtod(m, struct ether_header *);
  489         if (ETHER_CMP(eh->ether_dhost, sc->sc_arpcom.ac_enaddr) &&
  490             ETHER_CMP(eh->ether_dhost, etherbroadcastaddr)) {
  491                 m_freem(m);
  492                 return;
  493         }
  494 #endif
  495 
  496         /* Pass the packet up. */
  497         ether_input_mbuf(ifp, m);
  498 }
  499 
  500 integrate void
  501 am7990_rint(sc)
  502         struct am7990_softc *sc;
  503 {
  504         register int bix;
  505         int rp;
  506         struct lermd rmd;
  507 
  508         bix = sc->sc_last_rd;
  509 
  510         /* Process all buffers with valid data. */
  511         for (;;) {
  512                 rp = LE_RMDADDR(sc, bix);
  513                 (*sc->sc_copyfromdesc)(sc, &rmd, rp, sizeof(rmd));
  514 
  515                 if (rmd.rmd1_bits & LE_R1_OWN)
  516                         break;
  517 
  518                 if (rmd.rmd1_bits & LE_R1_ERR) {
  519                         if (rmd.rmd1_bits & LE_R1_ENP) {
  520 #ifdef LEDEBUG
  521                                 if ((rmd.rmd1_bits & LE_R1_OFLO) == 0) {
  522                                         if (rmd.rmd1_bits & LE_R1_FRAM)
  523                                                 printf("%s: framing error\n",
  524                                                     sc->sc_dev.dv_xname);
  525                                         if (rmd.rmd1_bits & LE_R1_CRC)
  526                                                 printf("%s: crc mismatch\n",
  527                                                     sc->sc_dev.dv_xname);
  528                                 }
  529 #endif
  530                         } else {
  531                                 if (rmd.rmd1_bits & LE_R1_OFLO)
  532                                         printf("%s: overflow\n",
  533                                             sc->sc_dev.dv_xname);
  534                         }
  535                         if (rmd.rmd1_bits & LE_R1_BUFF)
  536                                 printf("%s: receive buffer error\n",
  537                                     sc->sc_dev.dv_xname);
  538                         ifp->if_ierrors++;
  539                 } else if ((rmd.rmd1_bits & (LE_R1_STP | LE_R1_ENP)) !=
  540                     (LE_R1_STP | LE_R1_ENP)) {
  541                         printf("%s: dropping chained buffer\n",
  542                             sc->sc_dev.dv_xname);
  543                         ifp->if_ierrors++;
  544                 } else {
  545 #ifdef LEDEBUG1
  546                         if (sc->sc_debug)
  547                                 am7990_recv_print(sc, sc->sc_last_rd);
  548 #endif
  549                         am7990_read(sc, LE_RBUFADDR(sc, bix),
  550                             (int)rmd.rmd3 - 4);
  551                 }
  552 
  553                 rmd.rmd1_bits = LE_R1_OWN;
  554                 rmd.rmd2 = -ETHER_MAX_DIX_LEN | LE_XMD2_ONES;
  555                 rmd.rmd3 = 0;
  556                 (*sc->sc_copytodesc)(sc, &rmd, rp, sizeof(rmd));
  557 
  558 #ifdef LEDEBUG1
  559                 if (sc->sc_debug)
  560                         printf("sc->sc_last_rd = %x, rmd: "
  561                                "ladr %04x, hadr %02x, flags %02x, "
  562                                "bcnt %04x, mcnt %04x\n",
  563                                 sc->sc_last_rd,
  564                                 rmd.rmd0, rmd.rmd1_hadr, rmd.rmd1_bits,
  565                                 rmd.rmd2, rmd.rmd3);
  566 #endif
  567 
  568                 if (++bix == sc->sc_nrbuf)
  569                         bix = 0;
  570         }
  571 
  572         sc->sc_last_rd = bix;
  573 }
  574 
  575 integrate void
  576 am7990_tint(sc)
  577         register struct am7990_softc *sc;
  578 {
  579         register int bix;
  580         struct letmd tmd;
  581 
  582         bix = sc->sc_first_td;
  583 
  584         for (;;) {
  585                 if (sc->sc_no_td <= 0)
  586                         break;
  587 
  588                 (*sc->sc_copyfromdesc)(sc, &tmd, LE_TMDADDR(sc, bix),
  589                     sizeof(tmd));
  590 
  591 #ifdef LEDEBUG
  592                 if (sc->sc_debug)
  593                         printf("trans tmd: "
  594                             "ladr %04x, hadr %02x, flags %02x, "
  595                             "bcnt %04x, mcnt %04x\n",
  596                             tmd.tmd0, tmd.tmd1_hadr, tmd.tmd1_bits,
  597                             tmd.tmd2, tmd.tmd3);
  598 #endif
  599 
  600                 if (tmd.tmd1_bits & LE_T1_OWN)
  601                         break;
  602 
  603                 ifp->if_flags &= ~IFF_OACTIVE;
  604 
  605                 if (tmd.tmd1_bits & LE_T1_ERR) {
  606                         if (tmd.tmd3 & LE_T3_BUFF)
  607                                 printf("%s: transmit buffer error\n",
  608                                     sc->sc_dev.dv_xname);
  609                         else if (tmd.tmd3 & LE_T3_UFLO)
  610                                 printf("%s: underflow\n", sc->sc_dev.dv_xname);
  611                         if (tmd.tmd3 & (LE_T3_BUFF | LE_T3_UFLO)) {
  612                                 am7990_reset(sc);
  613                                 return;
  614                         }
  615                         if (tmd.tmd3 & LE_T3_LCAR) {
  616                                 if (sc->sc_nocarrier)
  617                                         (*sc->sc_nocarrier)(sc);
  618                         }
  619                         if (tmd.tmd3 & LE_T3_LCOL)
  620                                 ifp->if_collisions++;
  621                         if (tmd.tmd3 & LE_T3_RTRY) {
  622                                 printf("%s: excessive collisions, tdr %d\n",
  623                                     sc->sc_dev.dv_xname,
  624                                     tmd.tmd3 & LE_T3_TDR_MASK);
  625                                 ifp->if_collisions += 16;
  626                         }
  627                         ifp->if_oerrors++;
  628                 } else {
  629                         if (tmd.tmd1_bits & LE_T1_ONE)
  630                                 ifp->if_collisions++;
  631                         else if (tmd.tmd1_bits & LE_T1_MORE)
  632                                 /* Real number is unknown. */
  633                                 ifp->if_collisions += 2;
  634                         ifp->if_opackets++;
  635                 }
  636 
  637                 if (++bix == sc->sc_ntbuf)
  638                         bix = 0;
  639 
  640                 --sc->sc_no_td;
  641         }
  642 
  643         sc->sc_first_td = bix;
  644 
  645         am7990_start(ifp);
  646 
  647         if (sc->sc_no_td == 0)
  648                 ifp->if_timer = 0;
  649 }
  650 
  651 /*
  652  * Controller interrupt.
  653  */
  654 int
  655 am7990_intr(arg)
  656         register void *arg;
  657 {
  658         register struct am7990_softc *sc = arg;
  659         register u_int16_t isr;
  660 
  661         isr = (*sc->sc_rdcsr)(sc, LE_CSR0);
  662 #ifdef LEDEBUG
  663         if (sc->sc_debug){
  664                 printf("%s: am7990_intr entering with isr=%04x\n",
  665                     sc->sc_dev.dv_xname, isr);
  666                 printf(" isr: 0x%b\n", isr, LE_C0_BITS);
  667         }
  668 #endif
  669         if ((isr & LE_C0_INTR) == 0)
  670                 return (0);
  671 
  672         /*
  673          * After receiving an interrupt, we need to toggle the interrupt
  674          * enable bit in order to keep receiving them (some chips works
  675          * without this, some do not)
  676          */
  677         (*sc->sc_wrcsr)(sc, LE_CSR0, isr & ~LE_C0_INEA);
  678         (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA);
  679 
  680         if (isr & LE_C0_ERR) {
  681                 if (isr & LE_C0_BABL) {
  682 #ifdef LEDEBUG
  683                         printf("%s: babble\n", sc->sc_dev.dv_xname);
  684 #endif
  685                         ifp->if_oerrors++;
  686                 }
  687 #if 0
  688                 if (isr & LE_C0_CERR) {
  689                         printf("%s: collision error\n", sc->sc_dev.dv_xname);
  690                         ifp->if_collisions++;
  691                 }
  692 #endif
  693                 if (isr & LE_C0_MISS) {
  694 #ifdef LEDEBUG
  695                         printf("%s: missed packet\n", sc->sc_dev.dv_xname);
  696 #endif
  697                         ifp->if_ierrors++;
  698                 }
  699                 if (isr & LE_C0_MERR) {
  700                         printf("%s: memory error\n", sc->sc_dev.dv_xname);
  701                         am7990_reset(sc);
  702                         return (1);
  703                 }
  704         }
  705 
  706         if ((isr & LE_C0_RXON) == 0) {
  707                 printf("%s: receiver disabled\n", sc->sc_dev.dv_xname);
  708                 ifp->if_ierrors++;
  709                 am7990_reset(sc);
  710                 return (1);
  711         }
  712         if ((isr & LE_C0_TXON) == 0) {
  713                 printf("%s: transmitter disabled\n", sc->sc_dev.dv_xname);
  714                 ifp->if_oerrors++;
  715                 am7990_reset(sc);
  716                 return (1);
  717         }
  718 
  719         if (isr & LE_C0_RINT)
  720                 am7990_rint(sc);
  721         if (isr & LE_C0_TINT)
  722                 am7990_tint(sc);
  723 
  724         return (1);
  725 }
  726 
  727 #undef  ifp
  728 
  729 void
  730 am7990_watchdog(ifp)
  731         struct ifnet *ifp;
  732 {
  733         struct am7990_softc *sc = ifp->if_softc;
  734 
  735         log(LOG_ERR, "%s: device timeout\n", sc->sc_dev.dv_xname);
  736         ++ifp->if_oerrors;
  737 
  738         am7990_reset(sc);
  739 }
  740 
  741 /*
  742  * Setup output on interface.
  743  * Get another datagram to send off of the interface queue, and map it to the
  744  * interface before starting the output.
  745  * Called only at splnet or interrupt level.
  746  */
  747 void
  748 am7990_start(ifp)
  749         register struct ifnet *ifp;
  750 {
  751         register struct am7990_softc *sc = ifp->if_softc;
  752         register int bix;
  753         register struct mbuf *m;
  754         struct letmd tmd;
  755         int rp;
  756         int len;
  757 
  758         if ((ifp->if_flags & (IFF_RUNNING | IFF_OACTIVE)) != IFF_RUNNING)
  759                 return;
  760 
  761         bix = sc->sc_last_td;
  762 
  763         for (;;) {
  764                 rp = LE_TMDADDR(sc, bix);
  765                 (*sc->sc_copyfromdesc)(sc, &tmd, rp, sizeof(tmd));
  766 
  767                 if (tmd.tmd1_bits & LE_T1_OWN) {
  768                         ifp->if_flags |= IFF_OACTIVE;
  769                         printf("missing buffer, no_td = %d, last_td = %d\n",
  770                             sc->sc_no_td, sc->sc_last_td);
  771                 }
  772 
  773                 IFQ_DEQUEUE(&ifp->if_snd, m);
  774                 if (m == 0)
  775                         break;
  776 
  777 #if NBPFILTER > 0
  778                 /*
  779                  * If BPF is listening on this interface, let it see the packet
  780                  * before we commit it to the wire.
  781                  */
  782                 if (ifp->if_bpf)
  783                         bpf_mtap(ifp->if_bpf, m, BPF_DIRECTION_OUT);
  784 #endif
  785 
  786                 /*
  787                  * Copy the mbuf chain into the transmit buffer.
  788                  */
  789                 len = am7990_put(sc, LE_TBUFADDR(sc, bix), m);
  790 
  791 #ifdef LEDEBUG
  792                 if (len > ETHERMTU + sizeof(struct ether_header))
  793                         printf("packet length %d\n", len);
  794 #endif
  795 
  796                 ifp->if_timer = 5;
  797 
  798                 /*
  799                  * Init transmit registers, and set transmit start flag.
  800                  */
  801                 tmd.tmd1_bits = LE_T1_OWN | LE_T1_STP | LE_T1_ENP;
  802                 tmd.tmd2 = -len | LE_XMD2_ONES;
  803                 tmd.tmd3 = 0;
  804 
  805                 (*sc->sc_copytodesc)(sc, &tmd, rp, sizeof(tmd));
  806 
  807 #ifdef LEDEBUG
  808                 if (sc->sc_debug)
  809                         am7990_xmit_print(sc, sc->sc_last_td);
  810 #endif
  811 
  812                 (*sc->sc_wrcsr)(sc, LE_CSR0, LE_C0_INEA | LE_C0_TDMD);
  813 
  814                 if (++bix == sc->sc_ntbuf)
  815                         bix = 0;
  816 
  817                 if (++sc->sc_no_td == sc->sc_ntbuf) {
  818 #ifdef LEDEBUG
  819                         printf("\nequal!\n");
  820 #endif
  821                         ifp->if_flags |= IFF_OACTIVE;
  822                         break;
  823                 }
  824 
  825         }
  826 
  827         sc->sc_last_td = bix;
  828 }
  829 
  830 /*
  831  * Process an ioctl request.
  832  */
  833 int
  834 am7990_ioctl(ifp, cmd, data)
  835         register struct ifnet *ifp;
  836         u_long cmd;
  837         caddr_t data;
  838 {
  839         register struct am7990_softc *sc = ifp->if_softc;
  840         struct ifaddr *ifa = (struct ifaddr *)data;
  841         struct ifreq *ifr = (struct ifreq *)data;
  842         int s, error = 0;
  843 
  844         s = splnet();
  845 
  846         switch (cmd) {
  847         case SIOCSIFADDR:
  848                 ifp->if_flags |= IFF_UP;
  849 
  850                 switch (ifa->ifa_addr->sa_family) {
  851 #ifdef INET
  852                 case AF_INET:
  853                         am7990_init(sc);
  854                         arp_ifinit(&sc->sc_arpcom, ifa);
  855                         break;
  856 #endif
  857                 default:
  858                         am7990_init(sc);
  859                         break;
  860                 }
  861                 break;
  862 
  863         case SIOCSIFFLAGS:
  864                 if ((ifp->if_flags & IFF_UP) == 0 &&
  865                     (ifp->if_flags & IFF_RUNNING) != 0) {
  866                         /*
  867                          * If interface is marked down and it is running, then
  868                          * stop it.
  869                          */
  870                         am7990_stop(sc);
  871                         ifp->if_flags &= ~IFF_RUNNING;
  872                 } else if ((ifp->if_flags & IFF_UP) != 0 &&
  873                            (ifp->if_flags & IFF_RUNNING) == 0) {
  874                         /*
  875                          * If interface is marked up and it is stopped, then
  876                          * start it.
  877                          */
  878                         am7990_init(sc);
  879                 } else {
  880                         /*
  881                          * Reset the interface to pick up changes in any other
  882                          * flags that affect hardware registers.
  883                          */
  884                         /*am7990_stop(sc);*/
  885                         am7990_init(sc);
  886                 }
  887 #ifdef LEDEBUG
  888                 if (ifp->if_flags & IFF_DEBUG)
  889                         sc->sc_debug = 1;
  890                 else
  891                         sc->sc_debug = 0;
  892 #endif
  893                 break;
  894 
  895         case SIOCGIFMEDIA:
  896         case SIOCSIFMEDIA:
  897                 if (sc->sc_hasifmedia)
  898                         error = ifmedia_ioctl(ifp, ifr, &sc->sc_ifmedia, cmd);
  899                 else
  900                         error = EINVAL;
  901                 break;
  902 
  903         default:
  904                 error = ether_ioctl(ifp, &sc->sc_arpcom, cmd, data);
  905         }
  906 
  907         if (error == ENETRESET) {
  908                 if (ifp->if_flags & IFF_RUNNING)
  909                         am7990_reset(sc);
  910                 error = 0;
  911         }
  912 
  913         splx(s);
  914         return (error);
  915 }
  916 
  917 hide void
  918 am7990_shutdown(arg)
  919         void *arg;
  920 {
  921 
  922         am7990_stop((struct am7990_softc *)arg);
  923 }
  924 
  925 #ifdef LEDEBUG
  926 void
  927 am7990_recv_print(sc, no)
  928         struct am7990_softc *sc;
  929         int no;
  930 {
  931         struct lermd rmd;
  932         u_int16_t len;
  933         struct ether_header eh;
  934 
  935         (*sc->sc_copyfromdesc)(sc, &rmd, LE_RMDADDR(sc, no), sizeof(rmd));
  936         len = rmd.rmd3;
  937         printf("%s: receive buffer %d, len = %d\n", sc->sc_dev.dv_xname, no,
  938             len);
  939         printf("%s: status %04x\n", sc->sc_dev.dv_xname,
  940             (*sc->sc_rdcsr)(sc, LE_CSR0));
  941         printf("%s: ladr %04x, hadr %02x, flags %02x, bcnt %04x, mcnt %04x\n",
  942             sc->sc_dev.dv_xname,
  943             rmd.rmd0, rmd.rmd1_hadr, rmd.rmd1_bits, rmd.rmd2, rmd.rmd3);
  944         if (len >= sizeof(eh)) {
  945                 (*sc->sc_copyfrombuf)(sc, &eh, LE_RBUFADDR(sc, no), sizeof(eh));
  946                 printf("%s: dst %s", sc->sc_dev.dv_xname,
  947                         ether_sprintf(eh.ether_dhost));
  948                 printf(" src %s type %04x\n", ether_sprintf(eh.ether_shost),
  949                         ntohs(eh.ether_type));
  950         }
  951 }
  952 
  953 void
  954 am7990_xmit_print(sc, no)
  955         struct am7990_softc *sc;
  956         int no;
  957 {
  958         struct letmd tmd;
  959         u_int16_t len;
  960         struct ether_header eh;
  961 
  962         (*sc->sc_copyfromdesc)(sc, &tmd, LE_TMDADDR(sc, no), sizeof(tmd));
  963         len = -tmd.tmd2;
  964         printf("%s: transmit buffer %d, len = %d\n", sc->sc_dev.dv_xname, no,
  965             len);
  966         printf("%s: status %04x\n", sc->sc_dev.dv_xname,
  967             (*sc->sc_rdcsr)(sc, LE_CSR0));
  968         printf("%s: ladr %04x, hadr %02x, flags %02x, bcnt %04x, mcnt %04x\n",
  969             sc->sc_dev.dv_xname,
  970             tmd.tmd0, tmd.tmd1_hadr, tmd.tmd1_bits, tmd.tmd2, tmd.tmd3);
  971         if (len >= sizeof(eh)) {
  972                 (*sc->sc_copyfrombuf)(sc, &eh, LE_TBUFADDR(sc, no), sizeof(eh));
  973                 printf("%s: dst %s", sc->sc_dev.dv_xname,
  974                         ether_sprintf(eh.ether_dhost));
  975                 printf(" src %s type %04x\n", ether_sprintf(eh.ether_shost),
  976                     ntohs(eh.ether_type));
  977         }
  978 }
  979 #endif /* LEDEBUG */
  980 
  981 /*
  982  * Set up the logical address filter.
  983  */
  984 void
  985 am7990_setladrf(ac, af)
  986         struct arpcom *ac;
  987         u_int16_t *af;
  988 {
  989         struct ifnet *ifp = &ac->ac_if;
  990         struct ether_multi *enm;
  991         register u_int32_t crc;
  992         struct ether_multistep step;
  993 
  994         /*
  995          * Set up multicast address filter by passing all multicast addresses
  996          * through a crc generator, and then using the high order 6 bits as an
  997          * index into the 64 bit logical address filter.  The high order bit
  998          * selects the word, while the rest of the bits select the bit within
  999          * the word.
 1000          */
 1001 
 1002         if (ifp->if_flags & IFF_PROMISC)
 1003                 goto allmulti;
 1004 
 1005         af[0] = af[1] = af[2] = af[3] = 0x0000;
 1006         ETHER_FIRST_MULTI(step, ac, enm);
 1007         while (enm != NULL) {
 1008                 if (ETHER_CMP(enm->enm_addrlo, enm->enm_addrhi)) {
 1009                         /*
 1010                          * We must listen to a range of multicast addresses.
 1011                          * For now, just accept all multicasts, rather than
 1012                          * trying to set only those filter bits needed to match
 1013                          * the range.  (At this time, the only use of address
 1014                          * ranges is for IP multicast routing, for which the
 1015                          * range is big enough to require all bits set.)
 1016                          */
 1017                         goto allmulti;
 1018                 }
 1019 
 1020                 crc = ether_crc32_le(enm->enm_addrlo, ETHER_ADDR_LEN) >> 26;
 1021 
 1022                 /* Set the corresponding bit in the filter. */
 1023                 af[crc >> 4] |= 1 << (crc & 0xf);
 1024 
 1025                 ETHER_NEXT_MULTI(step, enm);
 1026         }
 1027         ifp->if_flags &= ~IFF_ALLMULTI;
 1028         return;
 1029 
 1030 allmulti:
 1031         ifp->if_flags |= IFF_ALLMULTI;
 1032         af[0] = af[1] = af[2] = af[3] = 0xffff;
 1033 }
 1034 
 1035 
 1036 /*
 1037  * Routines for accessing the transmit and receive buffers.
 1038  * The various CPU and adapter configurations supported by this
 1039  * driver require three different access methods for buffers
 1040  * and descriptors:
 1041  *      (1) contig (contiguous data; no padding),
 1042  *      (2) gap2 (two bytes of data followed by two bytes of padding),
 1043  *      (3) gap16 (16 bytes of data followed by 16 bytes of padding).
 1044  */
 1045 
 1046 /*
 1047  * contig: contiguous data with no padding.
 1048  *
 1049  * Buffers may have any alignment.
 1050  */
 1051 
 1052 void
 1053 am7990_copytobuf_contig(sc, from, boff, len)
 1054         struct am7990_softc *sc;
 1055         void *from;
 1056         int boff, len;
 1057 {
 1058         volatile caddr_t buf = sc->sc_mem;
 1059 
 1060         /*
 1061          * Just call bcopy() to do the work.
 1062          */
 1063         bcopy(from, buf + boff, len);
 1064 }
 1065 
 1066 void
 1067 am7990_copyfrombuf_contig(sc, to, boff, len)
 1068         struct am7990_softc *sc;
 1069         void *to;
 1070         int boff, len;
 1071 {
 1072         volatile caddr_t buf = sc->sc_mem;
 1073 
 1074         /*
 1075          * Just call bcopy() to do the work.
 1076          */
 1077         bcopy(buf + boff, to, len);
 1078 }
 1079 
 1080 void
 1081 am7990_zerobuf_contig(sc, boff, len)
 1082         struct am7990_softc *sc;
 1083         int boff, len;
 1084 {
 1085         volatile caddr_t buf = sc->sc_mem;
 1086 
 1087         /*
 1088          * Just let bzero() do the work
 1089          */
 1090         bzero(buf + boff, len);
 1091 }
 1092 
 1093 #if 0
 1094 /*
 1095  * Examples only; duplicate these and tweak (if necessary) in
 1096  * machine-specific front-ends.
 1097  */
 1098 
 1099 /*
 1100  * gap2: two bytes of data followed by two bytes of pad.
 1101  *
 1102  * Buffers must be 4-byte aligned.  The code doesn't worry about
 1103  * doing an extra byte.
 1104  */
 1105 
 1106 void
 1107 am7990_copytobuf_gap2(sc, fromv, boff, len)
 1108         struct am7990_softc *sc;
 1109         void *fromv;
 1110         int boff;
 1111         register int len;
 1112 {
 1113         volatile caddr_t buf = sc->sc_mem;
 1114         register caddr_t from = fromv;
 1115         register volatile u_int16_t *bptr;
 1116 
 1117         if (boff & 0x1) {
 1118                 /* handle unaligned first byte */
 1119                 bptr = ((volatile u_int16_t *)buf) + (boff - 1);
 1120                 *bptr = (*from++ << 8) | (*bptr & 0xff);
 1121                 bptr += 2;
 1122                 len--;
 1123         } else
 1124                 bptr = ((volatile u_int16_t *)buf) + boff;
 1125         while (len > 1) {
 1126                 *bptr = (from[1] << 8) | (from[0] & 0xff);
 1127                 bptr += 2;
 1128                 from += 2;
 1129                 len -= 2;
 1130         }
 1131         if (len == 1)
 1132                 *bptr = (u_int16_t)*from;
 1133 }
 1134 
 1135 void
 1136 am7990_copyfrombuf_gap2(sc, tov, boff, len)
 1137         struct am7990_softc *sc;
 1138         void *tov;
 1139         int boff, len;
 1140 {
 1141         volatile caddr_t buf = sc->sc_mem;
 1142         register caddr_t to = tov;
 1143         register volatile u_int16_t *bptr;
 1144         register u_int16_t tmp;
 1145 
 1146         if (boff & 0x1) {
 1147                 /* handle unaligned first byte */
 1148                 bptr = ((volatile u_int16_t *)buf) + (boff - 1);
 1149                 *to++ = (*bptr >> 8) & 0xff;
 1150                 bptr += 2;
 1151                 len--;
 1152         } else
 1153                 bptr = ((volatile u_int16_t *)buf) + boff;
 1154         while (len > 1) {
 1155                 tmp = *bptr;
 1156                 *to++ = tmp & 0xff;
 1157                 *to++ = (tmp >> 8) & 0xff;
 1158                 bptr += 2;
 1159                 len -= 2;
 1160         }
 1161         if (len == 1)
 1162                 *to = *bptr & 0xff;
 1163 }
 1164 
 1165 void
 1166 am7990_zerobuf_gap2(sc, boff, len)
 1167         struct am7990_softc *sc;
 1168         int boff, len;
 1169 {
 1170         volatile caddr_t buf = sc->sc_mem;
 1171         register volatile u_int16_t *bptr;
 1172 
 1173         if ((unsigned)boff & 0x1) {
 1174                 bptr = ((volatile u_int16_t *)buf) + (boff - 1);
 1175                 *bptr &= 0xff;
 1176                 bptr += 2;
 1177                 len--;
 1178         } else
 1179                 bptr = ((volatile u_int16_t *)buf) + boff;
 1180         while (len > 0) {
 1181                 *bptr = 0;
 1182                 bptr += 2;
 1183                 len -= 2;
 1184         }
 1185 }
 1186 
 1187 /*
 1188  * gap16: 16 bytes of data followed by 16 bytes of pad.
 1189  *
 1190  * Buffers must be 32-byte aligned.
 1191  */
 1192 
 1193 void
 1194 am7990_copytobuf_gap16(sc, fromv, boff, len)
 1195         struct am7990_softc *sc;
 1196         void *fromv;
 1197         int boff;
 1198         register int len;
 1199 {
 1200         volatile caddr_t buf = sc->sc_mem;
 1201         register caddr_t from = fromv;
 1202         register caddr_t bptr;
 1203         register int xfer;
 1204 
 1205         bptr = buf + ((boff << 1) & ~0x1f);
 1206         boff &= 0xf;
 1207         xfer = min(len, 16 - boff);
 1208         while (len > 0) {
 1209                 bcopy(from, bptr + boff, xfer);
 1210                 from += xfer;
 1211                 bptr += 32;
 1212                 boff = 0;
 1213                 len -= xfer;
 1214                 xfer = min(len, 16);
 1215         }
 1216 }
 1217 
 1218 void
 1219 am7990_copyfrombuf_gap16(sc, tov, boff, len)
 1220         struct am7990_softc *sc;
 1221         void *tov;
 1222         int boff, len;
 1223 {
 1224         volatile caddr_t buf = sc->sc_mem;
 1225         register caddr_t to = tov;
 1226         register caddr_t bptr;
 1227         register int xfer;
 1228 
 1229         bptr = buf + ((boff << 1) & ~0x1f);
 1230         boff &= 0xf;
 1231         xfer = min(len, 16 - boff);
 1232         while (len > 0) {
 1233                 bcopy(bptr + boff, to, xfer);
 1234                 to += xfer;
 1235                 bptr += 32;
 1236                 boff = 0;
 1237                 len -= xfer;
 1238                 xfer = min(len, 16);
 1239         }
 1240 }
 1241 
 1242 void
 1243 am7990_zerobuf_gap16(sc, boff, len)
 1244         struct am7990_softc *sc;
 1245         int boff, len;
 1246 {
 1247         volatile caddr_t buf = sc->sc_mem;
 1248         register caddr_t bptr;
 1249         register int xfer;
 1250 
 1251         bptr = buf + ((boff << 1) & ~0x1f);
 1252         boff &= 0xf;
 1253         xfer = min(len, 16 - boff);
 1254         while (len > 0) {
 1255                 bzero(bptr + boff, xfer);
 1256                 bptr += 32;
 1257                 boff = 0;
 1258                 len -= xfer;
 1259                 xfer = min(len, 16);
 1260         }
 1261 }
 1262 #endif /* Example only */

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