The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/if_cx.c

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    1 /*
    2  * Cronyx-Sigma adapter driver for FreeBSD.
    3  * Supports PPP/HDLC and Cisco/HDLC protocol in synchronous mode,
    4  * and asyncronous channels with full modem control.
    5  * Keepalive protocol implemented in both Cisco and PPP modes.
    6  *
    7  * Copyright (C) 1994 Cronyx Ltd.
    8  * Author: Serge Vakulenko, <vak@zebub.msk.su>
    9  *
   10  * This software is distributed with NO WARRANTIES, not even the implied
   11  * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   12  *
   13  * Authors grant any other persons or organisations permission to use
   14  * or modify this software as long as this message is kept with the software,
   15  * all derivative works or modified versions.
   16  *
   17  * Version 1.9, Wed Oct  4 18:58:15 MSK 1995
   18  *
   19  * $FreeBSD: releng/5.1/sys/i386/isa/if_cx.c 111119 2003-02-19 05:47:46Z imp $
   20  *
   21  */
   22 #undef DEBUG
   23 
   24 #include "cx.h"
   25 
   26 #include <sys/param.h>
   27 #include <sys/systm.h>
   28 #include <sys/kernel.h>
   29 #include <sys/malloc.h>
   30 #include <sys/mbuf.h>
   31 #include <sys/sockio.h>
   32 #include <sys/socket.h>
   33 #include <sys/conf.h>
   34 #include <sys/bus.h>
   35 
   36 #include <net/if.h>
   37 
   38 #include <net/bpf.h>
   39 
   40 #include <i386/isa/isa_device.h>
   41 
   42 #ifndef COMPAT_OLDISA
   43 #error "The cx device requires the old isa compatibility shims"
   44 #endif
   45 
   46 #define watchdog_func_t void(*)(struct ifnet *)
   47 #define start_func_t    void(*)(struct ifnet*)
   48 
   49 #include <net/if_sppp.h>
   50 #include <machine/cronyx.h>
   51 #include <i386/isa/cxreg.h>
   52 
   53 /* XXX exported. */
   54 void cxswitch (cx_chan_t *c, cx_soft_opt_t new);
   55 
   56 static int cxprobe(struct isa_device *id);
   57 static int cxattach(struct isa_device *id);
   58 static void cxput(cx_chan_t *c, char b);
   59 static void cxsend(cx_chan_t *c);
   60 static void cxrinth(cx_chan_t *c);
   61 static ointhand2_t cxintr;
   62 static int cxtinth(cx_chan_t *c);
   63 
   64 #ifdef DEBUG
   65 #   define print(s)     printf s
   66 #else
   67 #   define print(s)     {/*void*/}
   68 #endif
   69 
   70 #define TXTIMEOUT       10              /* transmit timeout in seconds */
   71 #define DMABUFSZ        (6*256)         /* buffer size */
   72 #define PPP_HEADER_LEN  4               /* size of PPP header */
   73 
   74 /*
   75  * Under BSDI it's possible to use general p2p protocol scheme,
   76  * as well as our own one.  Switching is done via IFF_ALTPHYS flag.
   77  * Our ifnet pointer holds the buffer large enough to contain
   78  * any of sppp and p2p structures.
   79  */
   80 #define IFSTRUCTSZ   (sizeof (struct sppp))
   81 #define IFNETSZ         (sizeof (struct ifnet))
   82 
   83 static int cxsioctl (struct ifnet *ifp, u_long cmd, caddr_t data);
   84 static void cxstart (struct ifnet *ifp);
   85 static void cxwatchdog (struct ifnet *ifp);
   86 static void cxinput (cx_chan_t *c, void *buf, unsigned len);
   87 extern int cxrinta (cx_chan_t *c);
   88 extern void cxtinta (cx_chan_t *c);
   89 extern void cxmint (cx_chan_t *c);
   90 extern timeout_t cxtimeout;
   91 static void cxdown (cx_chan_t *c);
   92 static void cxup (cx_chan_t *c);
   93 
   94 cx_board_t cxboard [NCX];           /* adapter state structures */
   95 cx_chan_t *cxchan [NCX*NCHAN];      /* unit to channel struct pointer */
   96 
   97 extern struct cdevsw cx_cdevsw;
   98 
   99 static unsigned short irq_valid_values [] = { 3, 5, 7, 10, 11, 12, 15, 0 };
  100 static unsigned short drq_valid_values [] = { 5, 6, 7, 0 };
  101 static unsigned short port_valid_values [] = {
  102         0x240, 0x260, 0x280, 0x300, 0x320, 0x380, 0x3a0, 0,
  103 };
  104 
  105 /*
  106  * Check that the value is contained in the list of correct values.
  107  */
  108 static int valid (unsigned short value, unsigned short *list)
  109 {
  110         while (*list)
  111                 if (value == *list++)
  112                         return (1);
  113         return (0);
  114 }
  115 
  116 /*
  117  * Print the mbuf chain, for debug purposes only.
  118  */
  119 static void printmbuf (struct mbuf *m)
  120 {
  121         printf ("mbuf:");
  122         for (; m; m=m->m_next) {
  123                 if (m->m_flags & M_PKTHDR)
  124                         printf (" HDR %d:", m->m_pkthdr.len);
  125                 if (m->m_flags & M_EXT)
  126                         printf (" EXT:");
  127                 printf (" %d", m->m_len);
  128         }
  129         printf ("\n");
  130 }
  131 
  132 /*
  133  * Make an mbuf from data.
  134  */
  135 static struct mbuf *makembuf (void *buf, unsigned len)
  136 {
  137         struct mbuf *m, *o, *p;
  138 
  139         MGETHDR (m, M_DONTWAIT, MT_DATA);
  140         if (! m)
  141                 return (0);
  142         if (len >= MINCLSIZE)
  143                 MCLGET (m, M_DONTWAIT);
  144         m->m_pkthdr.len = len;
  145         m->m_len = 0;
  146 
  147         p = m;
  148         while (len) {
  149                 unsigned n = M_TRAILINGSPACE (p);
  150                 if (n > len)
  151                         n = len;
  152 
  153                 if (! n) {
  154                         /* Allocate new mbuf. */
  155                         o = p;
  156                         MGET (p, M_DONTWAIT, MT_DATA);
  157                         if (! p) {
  158                                 m_freem (m);
  159                                 return (0);
  160                         }
  161                         if (len >= MINCLSIZE)
  162                                 MCLGET (p, M_DONTWAIT);
  163                         p->m_len = 0;
  164                         o->m_next = p;
  165 
  166                         n = M_TRAILINGSPACE (p);
  167                         if (n > len)
  168                                 n = len;
  169                 }
  170 
  171                 bcopy (buf, mtod (p, caddr_t) + p->m_len, n);
  172 
  173                 p->m_len += n;
  174                 buf = (char *)buf + n;
  175                 len -= n;
  176         }
  177         return (m);
  178 }
  179 
  180 /*
  181  * Test the presence of the adapter on the given i/o port.
  182  */
  183 static int
  184 cxprobe (struct isa_device *id)
  185 {
  186         int unit = id->id_unit;
  187         int iobase = id->id_iobase;
  188         int irq = id->id_irq;
  189         int drq = id->id_drq;
  190         int irqnum;
  191         irqnum = ffs (irq) - 1;
  192 
  193         print (("cx%d: probe iobase=0x%x irq=%d drq=%d\n",
  194                 unit, iobase, irqnum, drq));
  195         if (! valid (irqnum, irq_valid_values)) {
  196                 printf ("cx%d: Incorrect IRQ: %d\n", unit, irqnum);
  197                 return (0);
  198         }
  199         if (! valid (iobase, port_valid_values)) {
  200                 printf ("cx%d: Incorrect port address: 0x%x\n", unit, iobase);
  201                 return (0);
  202         }
  203         if (! valid (drq, drq_valid_values)) {
  204                 printf ("cx%d: Incorrect DMA channel: %d\n", unit, drq);
  205                 return (0);
  206         }
  207         if (! cx_probe_board (iobase))
  208                 return (0);
  209 
  210         return (1);
  211 }
  212 
  213 /*
  214  * The adapter is present, initialize the driver structures.
  215  */
  216 
  217 static int
  218 cxattach (struct isa_device *id)
  219 {
  220         int unit = id->id_unit;
  221         int iobase = id->id_iobase;
  222         int irq = id->id_irq;
  223         int drq = id->id_drq;
  224         cx_board_t *b = cxboard + unit;
  225         int i;
  226         struct sppp *sp;
  227 
  228         id->id_ointr = cxintr;
  229 
  230         /* Initialize the board structure. */
  231         cx_init (b, unit, iobase, ffs(irq)-1, drq);
  232 
  233         for (i=0; i<NCHAN; ++i) {
  234                 cx_chan_t *c = b->chan + i;
  235                 int u = b->num*NCHAN + i;
  236                 cxchan[u] = c;
  237 
  238                 if (c->type == T_NONE)
  239                         continue;
  240 
  241                 /* Allocate the buffer memory. */
  242                 c->arbuf = malloc (DMABUFSZ, M_DEVBUF, M_NOWAIT);
  243                 c->brbuf = malloc (DMABUFSZ, M_DEVBUF, M_NOWAIT);
  244                 c->atbuf = malloc (DMABUFSZ, M_DEVBUF, M_NOWAIT);
  245                 c->btbuf = malloc (DMABUFSZ, M_DEVBUF, M_NOWAIT);
  246 
  247                 /* All buffers should be located in lower 16M of memory! */
  248                 if (!c->arbuf || !c->brbuf || !c->atbuf || !c->btbuf) {
  249                         printf ("cx%d.%d: No memory for channel buffers\n",
  250                                 c->board->num, c->num);
  251                         c->type = T_NONE;
  252                 }
  253 
  254                 switch (c->type) {
  255                 case T_SYNC_RS232:
  256                 case T_SYNC_V35:
  257                 case T_SYNC_RS449:
  258                 case T_UNIV_RS232:
  259                 case T_UNIV_RS449:
  260                 case T_UNIV_V35:
  261                         c->ifp = malloc (IFSTRUCTSZ, M_DEVBUF, M_NOWAIT);
  262                         if (! c->ifp) {
  263                                 printf ("cx%d.%d: No memory for ifnet buffer\n",
  264                                         c->board->num, c->num);
  265                                 c->type = T_NONE;
  266                                 continue;
  267                         }
  268                         bzero (c->ifp, IFSTRUCTSZ);
  269                         c->master = c->ifp;
  270                         c->ifp->if_softc = c;
  271                         c->ifp->if_unit = u;
  272                         c->ifp->if_name = "cx";
  273                         c->ifp->if_mtu = PP_MTU;
  274                         c->ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
  275                         c->ifp->if_ioctl = cxsioctl;
  276                         c->ifp->if_start = (start_func_t) cxstart;
  277                         c->ifp->if_watchdog = (watchdog_func_t) cxwatchdog;
  278                         /* Init routine is never called by upper level? */
  279                         sppp_attach (c->ifp);
  280                         if_attach (c->ifp);
  281                         sp = (struct sppp*) c->ifp;
  282                         /* If BPF is in the kernel, call the attach for it. */
  283                         bpfattach (c->ifp, DLT_PPP, PPP_HEADER_LEN);
  284                 }
  285         }
  286 
  287         /* Reset the adapter. */
  288         cx_setup_board (b);
  289 
  290         /* Activate the timeout routine. */
  291         if (unit == 0)
  292                 timeout (cxtimeout, 0, hz*5);
  293 
  294         printf ("cx%d: <Cronyx-%s>\n", unit, b->name);
  295         make_dev(&cx_cdevsw, unit, UID_ROOT, GID_WHEEL, 0600, "cx%d", unit);
  296         return (1);
  297 }
  298 
  299 struct isa_driver cxdriver = {
  300         INTR_TYPE_NET,
  301         cxprobe,
  302         cxattach,
  303         "cx"
  304 };
  305 COMPAT_ISA_DRIVER(cx, cxdriver);
  306 
  307 /*
  308  * Process an ioctl request.
  309  */
  310 static int
  311 cxsioctl (struct ifnet *ifp, u_long cmd, caddr_t data)
  312 {
  313         cx_chan_t *q, *c = ifp->if_softc;
  314         int error, s, was_up, should_be_up;
  315 
  316         /*
  317          * No socket ioctls while the channel is in async mode.
  318          */
  319         if (c->type==T_NONE || c->mode==M_ASYNC)
  320                 return (EINVAL);
  321 
  322         /*
  323          * Socket ioctls on slave subchannels are not allowed.
  324          */
  325         if (c->master != c->ifp)
  326                 return (EBUSY);
  327 
  328         was_up = (ifp->if_flags & IFF_RUNNING) != 0;
  329         error = sppp_ioctl (ifp, cmd, data);
  330         if (error)
  331                 return (error);
  332 
  333         print (("cxioctl (%d.%d, ", c->board->num, c->num));
  334         switch (cmd) {
  335         default:
  336                 print (("0x%x)\n", cmd));
  337                 return (0);
  338         case SIOCADDMULTI:
  339                 print (("SIOCADDMULTI)\n"));
  340                 return (0);
  341         case SIOCDELMULTI:
  342                 print (("SIOCDELMULTI)\n"));
  343                 return (0);
  344         case SIOCSIFFLAGS:
  345                 print (("SIOCSIFFLAGS)\n"));
  346                 break;
  347         case SIOCSIFADDR:
  348                 print (("SIOCSIFADDR)\n"));
  349                 break;
  350         }
  351 
  352         /* We get here only in case of SIFFLAGS or SIFADDR. */
  353         s = splimp ();
  354         should_be_up = (ifp->if_flags & IFF_RUNNING) != 0;
  355         if (!was_up && should_be_up) {
  356                 /* Interface goes up -- start it. */
  357                 cxup (c);
  358 
  359                 /* Start all slave subchannels. */
  360                 for (q=c->slaveq; q; q=q->slaveq)
  361                         cxup (q);
  362 
  363                 cxstart (c->ifp);
  364         } else if (was_up && !should_be_up) {
  365                 /* Interface is going down -- stop it. */
  366                 cxdown (c);
  367 
  368                 /* Stop all slave subchannels. */
  369                 for (q=c->slaveq; q; q=q->slaveq)
  370                         cxdown (q);
  371 
  372                 /* Flush the interface output queue */
  373                 if (! c->sopt.ext)
  374                         sppp_flush (c->ifp);
  375         }
  376         splx (s);
  377         return (0);
  378 }
  379 
  380 /*
  381  * Stop the interface.  Called on splimp().
  382  */
  383 static void
  384 cxdown (cx_chan_t *c)
  385 {
  386         unsigned short port = c->chip->port;
  387 
  388         print (("cx%d.%d: cxdown\n", c->board->num, c->num));
  389 
  390         /* The interface is down, stop it */
  391         c->ifp->if_flags &= ~IFF_OACTIVE;
  392 
  393         /* Reset the channel (for sync modes only) */
  394                 outb (CAR(port), c->num & 3);
  395                 outb (STCR(port), STC_ABORTTX | STC_SNDSPC);
  396 
  397         cx_setup_chan (c);
  398 }
  399 
  400 /*
  401  * Start the interface.  Called on splimp().
  402  */
  403 static void
  404 cxup (cx_chan_t *c)
  405 {
  406         unsigned short port = c->chip->port;
  407 
  408                 /* The interface is up, start it */
  409                 print (("cx%d.%d: cxup\n", c->board->num, c->num));
  410 
  411                 /* Initialize channel, enable receiver and transmitter */
  412                 cx_cmd (port, CCR_INITCH | CCR_ENRX | CCR_ENTX);
  413                 /* Repeat the command, to avoid the rev.H bug */
  414                 cx_cmd (port, CCR_INITCH | CCR_ENRX | CCR_ENTX);
  415 
  416                 /* Start receiver */
  417                 outw (ARBCNT(port), DMABUFSZ);
  418                 outb (ARBSTS(port), BSTS_OWN24);
  419                 outw (BRBCNT(port), DMABUFSZ);
  420                 outb (BRBSTS(port), BSTS_OWN24);
  421 
  422                 /* Raise DTR and RTS */
  423                 cx_chan_dtr (c, 1);
  424                 cx_chan_rts (c, 1);
  425 
  426                 /* Enable interrupts */
  427                 outb (IER(port), IER_RXD | IER_TXD);
  428 }
  429 
  430 /*
  431  * Fill transmitter buffer with data.
  432  */
  433 static void 
  434 cxput (cx_chan_t *c, char b)
  435 {
  436         struct mbuf *m;
  437         unsigned char *buf;
  438         unsigned short port = c->chip->port, len, cnt_port, sts_port;
  439 
  440         /* Choose the buffer. */
  441         if (b == 'A') {
  442                 buf      = c->atbuf;
  443                 cnt_port = ATBCNT(port);
  444                 sts_port = ATBSTS(port);
  445         } else {
  446                 buf      = c->btbuf;
  447                 cnt_port = BTBCNT(port);
  448                 sts_port = BTBSTS(port);
  449         }
  450 
  451         /* Is it busy? */
  452         if (inb (sts_port) & BSTS_OWN24) {
  453                 if (c->ifp->if_flags & IFF_DEBUG)
  454                         print (("cx%d.%d: tbuf %c already busy, bsts=%b\n",
  455                                 c->board->num, c->num, b,
  456                                 inb (sts_port), BSTS_BITS));
  457                 goto ret;
  458         }
  459 
  460         /* Get the packet to send. */
  461         m = sppp_dequeue (c->master);
  462         if (! m)
  463                 return;
  464         len = m->m_pkthdr.len;
  465 
  466         /* Count the transmitted bytes to the subchannel, not the master. */
  467         c->master->if_obytes -= len + 3;
  468         c->ifp->if_obytes += len + 3;
  469         c->stat->obytes += len + 3;
  470 
  471         if (len >= DMABUFSZ) {
  472                 printf ("cx%d.%d: too long packet: %d bytes: ",
  473                         c->board->num, c->num, len);
  474                 printmbuf (m);
  475                 m_freem (m);
  476                 return;
  477         }
  478         m_copydata (m, 0, len, buf);
  479         BPF_MTAP (c->ifp, m);
  480         m_freem (m);
  481 
  482         /* Start transmitter. */
  483         outw (cnt_port, len);
  484         outb (sts_port, BSTS_EOFR | BSTS_INTR | BSTS_OWN24);
  485 
  486         if (c->ifp->if_flags & IFF_DEBUG)
  487                 print (("cx%d.%d: enqueue %d bytes to %c\n",
  488                         c->board->num, c->num, len, buf==c->atbuf ? 'A' : 'B'));
  489 ret:
  490         c->ifp->if_flags |= IFF_OACTIVE;
  491 }
  492 
  493 /*
  494  * Start output on the (slave) interface.  Get another datagram to send
  495  * off of the interface queue, and copy it to the interface
  496  * before starting the output.
  497  */
  498 static void
  499 cxsend (cx_chan_t *c)
  500 {
  501         unsigned short port = c->chip->port;
  502 
  503         if (c->ifp->if_flags & IFF_DEBUG)
  504                 print (("cx%d.%d: cxsend\n", c->board->num, c->num));
  505 
  506         /* No output if the interface is down. */
  507         if (! (c->ifp->if_flags & IFF_RUNNING))
  508                 return;
  509 
  510         /* Set the current channel number. */
  511         outb (CAR(port), c->num & 3);
  512 
  513         /* Determine the buffer order. */
  514         if (inb (DMABSTS(port)) & DMABSTS_NTBUF) {
  515                 cxput (c, 'B');
  516                 cxput (c, 'A');
  517         } else {
  518                 cxput (c, 'A');
  519                 cxput (c, 'B');
  520         }
  521 
  522         /* Set up transmit timeout. */
  523         if (c->master->if_flags & IFF_OACTIVE)
  524                 c->master->if_timer = TXTIMEOUT;
  525 
  526         /*
  527          * Enable TXMPTY interrupt,
  528          * to catch the case when the second buffer is empty.
  529          */
  530         if ((inb (ATBSTS(port)) & BSTS_OWN24) &&
  531             (inb (BTBSTS(port)) & BSTS_OWN24)) {
  532                 outb (IER(port), IER_RXD | IER_TXD | IER_TXMPTY);
  533         } else
  534                 outb (IER(port), IER_RXD | IER_TXD);
  535 }
  536 
  537 /*
  538  * Start output on the (master) interface and all slave interfaces.
  539  * Always called on splimp().
  540  */
  541 static void
  542 cxstart (struct ifnet *ifp)
  543 {
  544         cx_chan_t *q, *c = ifp->if_softc;
  545 
  546         if (c->ifp->if_flags & IFF_DEBUG)
  547                 print (("cx%d.%d: cxstart\n", c->board->num, c->num));
  548 
  549         /* Start the master subchannel. */
  550         cxsend (c);
  551 
  552         /* Start all slave subchannels. */
  553         if (c->slaveq && ! sppp_isempty (c->master))
  554                 for (q=c->slaveq; q; q=q->slaveq)
  555                         if ((q->ifp->if_flags & IFF_RUNNING) &&
  556                             ! (q->ifp->if_flags & IFF_OACTIVE))
  557                                 cxsend (q);
  558 }
  559 
  560 /*
  561  * Handle transmit timeouts.
  562  * Recover after lost transmit interrupts.
  563  * Always called on splimp().
  564  */
  565 static void
  566 cxwatchdog (struct ifnet *ifp)
  567 {
  568         cx_chan_t *q, *c = ifp->if_softc;
  569 
  570         if (! (ifp->if_flags & IFF_RUNNING))
  571                 return;
  572         if (ifp->if_flags & IFF_DEBUG)
  573                 printf ("cx%d.%d: device timeout\n", c->board->num, c->num);
  574 
  575         cxdown (c);
  576         for (q=c->slaveq; q; q=q->slaveq)
  577                 cxdown (q);
  578 
  579         cxup (c);
  580         for (q=c->slaveq; q; q=q->slaveq)
  581                 cxup (q);
  582 
  583                 cxstart (ifp);
  584 }
  585 
  586 /*
  587  * Handle receive interrupts, including receive errors and
  588  * receive timeout interrupt.
  589  */
  590 static void 
  591 cxrinth (cx_chan_t *c)
  592 {
  593         unsigned short port = c->chip->port;
  594         unsigned short len, risr = inw (RISR(port));
  595 
  596         /* Receive errors. */
  597         if (risr & (RIS_BUSERR | RIS_OVERRUN | RISH_CRCERR | RISH_RXABORT)) {
  598                 if (c->ifp->if_flags & IFF_DEBUG)
  599                         printf ("cx%d.%d: receive error, risr=%b\n",
  600                                 c->board->num, c->num, risr, RISH_BITS);
  601                 ++c->ifp->if_ierrors;
  602                 ++c->stat->ierrs;
  603                 if (risr & RIS_OVERRUN)
  604                         ++c->ifp->if_collisions;
  605         } else if (risr & RIS_EOBUF) {
  606                 if (c->ifp->if_flags & IFF_DEBUG)
  607                         print (("cx%d.%d: hdlc receive interrupt, risr=%b, arbsts=%b, brbsts=%b\n",
  608                                 c->board->num, c->num, risr, RISH_BITS,
  609                                 inb (ARBSTS(port)), BSTS_BITS,
  610                                 inb (BRBSTS(port)), BSTS_BITS));
  611                 ++c->stat->ipkts;
  612 
  613                 /* Handle received data. */
  614                 len = (risr & RIS_BB) ? inw(BRBCNT(port)) : inw(ARBCNT(port));
  615                 c->stat->ibytes += len;
  616                 if (len > DMABUFSZ) {
  617                         /* Fatal error: actual DMA transfer size
  618                          * exceeds our buffer size.  It could be caused
  619                          * by incorrectly programmed DMA register or
  620                          * hardware fault.  Possibly, should panic here. */
  621                         printf ("cx%d.%d: panic! DMA buffer overflow: %d bytes\n",
  622                                c->board->num, c->num, len);
  623                         ++c->ifp->if_ierrors;
  624                 } else if (! (risr & RIS_EOFR)) {
  625                         /* The received frame does not fit in the DMA buffer.
  626                          * It could be caused by serial lie noise,
  627                          * or if the peer has too big MTU. */
  628                         if (c->ifp->if_flags & IFF_DEBUG)
  629                                 printf ("cx%d.%d: received frame length exceeds MTU, risr=%b\n",
  630                                         c->board->num, c->num, risr, RISH_BITS);
  631                         ++c->ifp->if_ierrors;
  632                 } else {
  633                         /* Valid frame received. */
  634                         if (c->ifp->if_flags & IFF_DEBUG)
  635                                 print (("cx%d.%d: hdlc received %d bytes\n",
  636                                 c->board->num, c->num, len));
  637                         cxinput (c, (risr & RIS_BB) ? c->brbuf : c->arbuf, len);
  638                         ++c->ifp->if_ipackets;
  639                 }
  640         } else if (c->ifp->if_flags & IFF_DEBUG) {
  641                 print (("cx%d.%d: unknown hdlc receive interrupt, risr=%b\n",
  642                         c->board->num, c->num, risr, RISH_BITS));
  643                 ++c->stat->ierrs;
  644         }
  645 
  646         /* Restart receiver. */
  647         if (! (inb (ARBSTS(port)) & BSTS_OWN24)) {
  648                 outw (ARBCNT(port), DMABUFSZ);
  649                 outb (ARBSTS(port), BSTS_OWN24);
  650         }
  651         if (! (inb (BRBSTS(port)) & BSTS_OWN24)) {
  652                 outw (BRBCNT(port), DMABUFSZ);
  653                 outb (BRBSTS(port), BSTS_OWN24);
  654         }
  655 }
  656 
  657 /*
  658  * Handle transmit interrupt.
  659  */
  660 static int
  661 cxtinth (cx_chan_t *c)
  662 {
  663         unsigned short port = c->chip->port;
  664         unsigned char tisr = inb (TISR(port));
  665         unsigned char teoir = 0;
  666 
  667         c->ifp->if_flags &= ~IFF_OACTIVE;
  668         if (c->ifp == c->master)
  669                 c->ifp->if_timer = 0;
  670 
  671         if (tisr & (TIS_BUSERR | TIS_UNDERRUN)) {
  672                 /* if (c->ifp->if_flags & IFF_DEBUG) */
  673                         print (("cx%d.%d: transmit error, tisr=%b, atbsts=%b, btbsts=%b\n",
  674                                 c->board->num, c->num, tisr, TIS_BITS,
  675                                 inb (ATBSTS(port)), BSTS_BITS,
  676                                 inb (BTBSTS(port)), BSTS_BITS));
  677                 ++c->ifp->if_oerrors;
  678                 ++c->stat->oerrs;
  679 
  680                 /* Terminate the failed buffer. */
  681                 /* teoir = TEOI_TERMBUFF; */
  682         } else if (c->ifp->if_flags & IFF_DEBUG)
  683                 print (("cx%d.%d: hdlc transmit interrupt, tisr=%b, atbsts=%b, btbsts=%b\n",
  684                         c->board->num, c->num, tisr, TIS_BITS,
  685                         inb (ATBSTS(port)), BSTS_BITS,
  686                         inb (BTBSTS(port)), BSTS_BITS));
  687 
  688         if (tisr & TIS_EOFR) {
  689                 ++c->ifp->if_opackets;
  690                 ++c->stat->opkts;
  691         }
  692 
  693         /* Start output on the (sub-) channel. */
  694         cxsend (c);
  695 
  696         return (teoir);
  697 }
  698 
  699 static void
  700 cxintr (int bnum)
  701 {
  702         cx_board_t *b = cxboard + bnum;
  703         while (! (inw (BSR(b->port)) & BSR_NOINTR)) {
  704                 /* Acknowledge the interrupt to enter the interrupt context. */
  705                 /* Read the local interrupt vector register. */
  706                 unsigned char livr = inb (IACK(b->port, BRD_INTR_LEVEL));
  707                 cx_chan_t *c = b->chan + (livr>>2 & 0xf);
  708                 unsigned short port = c->chip->port;
  709                 unsigned short eoiport = REOIR(port);
  710                 unsigned char eoi = 0;
  711 
  712                 if (c->type == T_NONE) {
  713                         printf ("cx%d.%d: unexpected interrupt, livr=0x%x\n",
  714                                 c->board->num, c->num, livr);
  715                         continue;       /* incorrect channel number? */
  716                 }
  717                 /* print (("cx%d.%d: interrupt, livr=0x%x\n",
  718                         c->board->num, c->num, livr)); */
  719 
  720                 /* Clear RTS to stop receiver data flow while we are busy
  721                  * processing the interrupt, thus avoiding underruns. */
  722                 if (! c->sopt.norts) {
  723                         outb (MSVR_RTS(port), 0);
  724                         c->rts = 0;
  725                 }
  726 
  727                 switch (livr & 3) {
  728                 case LIV_EXCEP:         /* receive exception */
  729                 case LIV_RXDATA:        /* receive interrupt */
  730                         ++c->stat->rintr;
  731                         switch (c->mode) {
  732                         case M_ASYNC: eoi = cxrinta (c); break;
  733                         case M_HDLC:  cxrinth (c);       break;
  734                         default:;       /* No bisync and X.21 yet */
  735                         }
  736                         break;
  737                 case LIV_TXDATA:        /* transmit interrupt */
  738                         ++c->stat->tintr;
  739                         eoiport = TEOIR(port);
  740                         switch (c->mode) {
  741                         case M_ASYNC: cxtinta (c);       break;
  742                         case M_HDLC:  eoi = cxtinth (c); break;
  743                         default:;       /* No bisync and X.21 yet */
  744                         }
  745                         break;
  746                 case LIV_MODEM:         /* modem/timer interrupt */
  747                         ++c->stat->mintr;
  748                         eoiport = MEOIR(port);
  749                         cxmint (c);
  750                         break;
  751                 }
  752 
  753                 /* Raise RTS for this channel if and only if
  754                  * both receive buffers are empty. */
  755                 if (! c->sopt.norts && (inb (CSR(port)) & CSRA_RXEN) &&
  756                     (inb (ARBSTS(port)) & BSTS_OWN24) &&
  757                     (inb (BRBSTS(port)) & BSTS_OWN24)) {
  758                         outb (MSVR_RTS(port), MSV_RTS);
  759                         c->rts = 1;
  760                 }
  761 
  762                 /* Exit from interrupt context. */
  763                 outb (eoiport, eoi);
  764 
  765                 /* Master channel - start output on all idle subchannels. */
  766                 if (c->master == c->ifp && c->slaveq &&
  767                     (livr & 3) == LIV_TXDATA && c->mode == M_HDLC &&
  768                     ! sppp_isempty (c->ifp)) {
  769                         cx_chan_t *q;
  770 
  771                         for (q=c->slaveq; q; q=q->slaveq)
  772                                 if ((q->ifp->if_flags & IFF_RUNNING) &&
  773                                     ! (q->ifp->if_flags & IFF_OACTIVE))
  774                                         cxsend (q);
  775                 }
  776         }
  777 }
  778 
  779 /*
  780  * Process the received packet.
  781  */
  782 static void 
  783 cxinput (cx_chan_t *c, void *buf, unsigned len)
  784 {
  785         /* Make an mbuf. */
  786         struct mbuf *m = makembuf (buf, len);
  787         if (! m) {
  788                 if (c->ifp->if_flags & IFF_DEBUG)
  789                         printf ("cx%d.%d: no memory for packet\n",
  790                                 c->board->num, c->num);
  791                 ++c->ifp->if_iqdrops;
  792                 return;
  793         }
  794         m->m_pkthdr.rcvif = c->master;
  795 #ifdef DEBUG
  796         if (c->ifp->if_flags & IFF_DEBUG)
  797         printmbuf (m);
  798 #endif
  799 
  800         /*
  801          * Check if there's a BPF listener on this interface.
  802          * If so, hand off the raw packet to bpf.
  803          */
  804         BPF_TAP (c->ifp, buf, len);
  805 
  806         /* Count the received bytes to the subchannel, not the master. */
  807         c->master->if_ibytes -= len + 3;
  808         c->ifp->if_ibytes += len + 3;
  809 
  810         sppp_input (c->master, m);
  811 }
  812 
  813 void cxswitch (cx_chan_t *c, cx_soft_opt_t new)
  814 {
  815         new.ext = 0;
  816         if (! new.ext) {
  817                 struct sppp *sp = (struct sppp*) c->ifp;
  818 
  819 #if 0 /* Doesn't work this way any more 990402 /phk */
  820                 if (new.cisco)
  821                         sp->pp_flags |= PP_CISCO;
  822                 else
  823                         sp->pp_flags &= ~PP_CISCO;
  824 #endif
  825                 if (new.keepalive)
  826                         sp->pp_flags |= PP_KEEPALIVE;
  827                 else
  828                         sp->pp_flags &= ~PP_KEEPALIVE;
  829         }
  830         c->sopt = new;
  831 }

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