/* * Cronyx-Sigma adapter driver for FreeBSD. * Supports PPP/HDLC and Cisco/HDLC protocol in synchronous mode, * and asyncronous channels with full modem control. * Keepalive protocol implemented in both Cisco and PPP modes. * * Copyright (C) 1994 Cronyx Ltd. * Author: Serge Vakulenko, * * This software is distributed with NO WARRANTIES, not even the implied * warranties for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * * Authors grant any other persons or organisations permission to use * or modify this software as long as this message is kept with the software, * all derivative works or modified versions. * * Version 1.9, Wed Oct 4 18:58:15 MSK 1995 */ #undef DEBUG #include "cx.h" #include "bpfilter.h" #include "opt_devfs.h" #include "sppp.h" #if NSPPP <= 0 #error The device 'cx' requires sppp. #endif #include #include #include #include #include #include #include #include #include #if NBPFILTER > 0 #include #endif #include #ifdef DEVFS extern struct cdevsw cx_cdevsw; #include #endif /*DEVFS*/ #define watchdog_func_t void(*)(struct ifnet *) #define start_func_t void(*)(struct ifnet*) #include #include #include /* XXX exported. */ void cxswitch (cx_chan_t *c, cx_soft_opt_t new); static int cxprobe __P((struct isa_device *id)); static int cxattach __P((struct isa_device *id)); static void cxput __P((cx_chan_t *c, char b)); static void cxsend __P((cx_chan_t *c)); static void cxrinth __P((cx_chan_t *c)); static ointhand2_t cxintr; static int cxtinth __P((cx_chan_t *c)); #ifdef DEBUG # define print(s) printf s #else # define print(s) {/*void*/} #endif #define TXTIMEOUT 10 /* transmit timeout in seconds */ #define DMABUFSZ (6*256) /* buffer size */ #define PPP_HEADER_LEN 4 /* size of PPP header */ /* * Under BSDI it's possible to use general p2p protocol scheme, * as well as our own one. Switching is done via IFF_ALTPHYS flag. * Our ifnet pointer holds the buffer large enough to contain * any of sppp and p2p structures. */ #define IFSTRUCTSZ (sizeof (struct sppp)) #define IFNETSZ (sizeof (struct ifnet)) static int cxsioctl (struct ifnet *ifp, u_long cmd, caddr_t data); static void cxstart (struct ifnet *ifp); static void cxwatchdog (struct ifnet *ifp); static void cxinput (cx_chan_t *c, void *buf, unsigned len); extern int cxrinta (cx_chan_t *c); extern void cxtinta (cx_chan_t *c); extern void cxmint (cx_chan_t *c); extern timeout_t cxtimeout; static void cxdown (cx_chan_t *c); static void cxup (cx_chan_t *c); cx_board_t cxboard [NCX]; /* adapter state structures */ cx_chan_t *cxchan [NCX*NCHAN]; /* unit to channel struct pointer */ static unsigned short irq_valid_values [] = { 3, 5, 7, 10, 11, 12, 15, 0 }; static unsigned short drq_valid_values [] = { 5, 6, 7, 0 }; static unsigned short port_valid_values [] = { 0x240, 0x260, 0x280, 0x300, 0x320, 0x380, 0x3a0, 0, }; /* * Check that the value is contained in the list of correct values. */ static int valid (unsigned short value, unsigned short *list) { while (*list) if (value == *list++) return (1); return (0); } /* * Print the mbuf chain, for debug purposes only. */ static void printmbuf (struct mbuf *m) { printf ("mbuf:"); for (; m; m=m->m_next) { if (m->m_flags & M_PKTHDR) printf (" HDR %d:", m->m_pkthdr.len); if (m->m_flags & M_EXT) printf (" EXT:"); printf (" %d", m->m_len); } printf ("\n"); } /* * Make an mbuf from data. */ static struct mbuf *makembuf (void *buf, unsigned len) { struct mbuf *m, *o, *p; MGETHDR (m, M_DONTWAIT, MT_DATA); if (! m) return (0); if (len >= MINCLSIZE) MCLGET (m, M_DONTWAIT); m->m_pkthdr.len = len; m->m_len = 0; p = m; while (len) { unsigned n = M_TRAILINGSPACE (p); if (n > len) n = len; if (! n) { /* Allocate new mbuf. */ o = p; MGET (p, M_DONTWAIT, MT_DATA); if (! p) { m_freem (m); return (0); } if (len >= MINCLSIZE) MCLGET (p, M_DONTWAIT); p->m_len = 0; o->m_next = p; n = M_TRAILINGSPACE (p); if (n > len) n = len; } bcopy (buf, mtod (p, caddr_t) + p->m_len, n); p->m_len += n; buf = (char *)buf + n; len -= n; } return (m); } /* * Test the presence of the adapter on the given i/o port. */ static int cxprobe (struct isa_device *id) { int unit = id->id_unit; int iobase = id->id_iobase; int irq = id->id_irq; int drq = id->id_drq; int irqnum; irqnum = ffs (irq) - 1; print (("cx%d: probe iobase=0x%x irq=%d drq=%d\n", unit, iobase, irqnum, drq)); if (! valid (irqnum, irq_valid_values)) { printf ("cx%d: Incorrect IRQ: %d\n", unit, irqnum); return (0); } if (! valid (iobase, port_valid_values)) { printf ("cx%d: Incorrect port address: 0x%x\n", unit, iobase); return (0); } if (! valid (drq, drq_valid_values)) { printf ("cx%d: Incorrect DMA channel: %d\n", unit, drq); return (0); } if (! cx_probe_board (iobase)) return (0); return (1); } /* * The adapter is present, initialize the driver structures. */ #ifdef DEVFS static void *cx_devfs_token; #endif static int cxattach (struct isa_device *id) { int unit = id->id_unit; int iobase = id->id_iobase; int irq = id->id_irq; int drq = id->id_drq; cx_board_t *b = cxboard + unit; int i; struct sppp *sp; id->id_ointr = cxintr; /* Initialize the board structure. */ cx_init (b, unit, iobase, ffs(irq)-1, drq); for (i=0; ichan + i; int u = b->num*NCHAN + i; cxchan[u] = c; if (c->type == T_NONE) continue; /* Allocate the buffer memory. */ c->arbuf = malloc (DMABUFSZ, M_DEVBUF, M_NOWAIT); c->brbuf = malloc (DMABUFSZ, M_DEVBUF, M_NOWAIT); c->atbuf = malloc (DMABUFSZ, M_DEVBUF, M_NOWAIT); c->btbuf = malloc (DMABUFSZ, M_DEVBUF, M_NOWAIT); /* All buffers should be located in lower 16M of memory! */ if (!c->arbuf || !c->brbuf || !c->atbuf || !c->btbuf) { printf ("cx%d.%d: No memory for channel buffers\n", c->board->num, c->num); c->type = T_NONE; } switch (c->type) { case T_SYNC_RS232: case T_SYNC_V35: case T_SYNC_RS449: case T_UNIV_RS232: case T_UNIV_RS449: case T_UNIV_V35: c->ifp = malloc (IFSTRUCTSZ, M_DEVBUF, M_NOWAIT); if (! c->ifp) { printf ("cx%d.%d: No memory for ifnet buffer\n", c->board->num, c->num); c->type = T_NONE; continue; } bzero (c->ifp, IFSTRUCTSZ); c->master = c->ifp; c->ifp->if_softc = c; c->ifp->if_unit = u; c->ifp->if_name = "cx"; c->ifp->if_mtu = PP_MTU; c->ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; c->ifp->if_ioctl = cxsioctl; c->ifp->if_start = (start_func_t) cxstart; c->ifp->if_watchdog = (watchdog_func_t) cxwatchdog; /* Init routine is never called by upper level? */ sppp_attach (c->ifp); if_attach (c->ifp); /* * Shortcut the sppp tls/tlf actions to up/down * events since our lower layer is always ready. */ sp = (struct sppp*) c->ifp; sp->pp_tls = sp->pp_up; sp->pp_tlf = sp->pp_down; #if NBPFILTER > 0 /* If BPF is in the kernel, call the attach for it. */ bpfattach (c->ifp, DLT_PPP, PPP_HEADER_LEN); #endif } } /* Reset the adapter. */ cx_setup_board (b); /* Activate the timeout routine. */ if (unit == 0) timeout (cxtimeout, 0, hz*5); printf ("cx%d: \n", unit, b->name); #ifdef DEVFS cx_devfs_token = devfs_add_devswf(&cx_cdevsw, 0, DV_CHR, 0, 0, 0600, "cx"); #endif return (1); } struct isa_driver cxdriver = { cxprobe, cxattach, "cx" }; /* * Process an ioctl request. */ static int cxsioctl (struct ifnet *ifp, u_long cmd, caddr_t data) { cx_chan_t *q, *c = ifp->if_softc; int error, s, was_up, should_be_up; /* * No socket ioctls while the channel is in async mode. */ if (c->type==T_NONE || c->mode==M_ASYNC) return (EINVAL); /* * Socket ioctls on slave subchannels are not allowed. */ if (c->master != c->ifp) return (EBUSY); was_up = (ifp->if_flags & IFF_RUNNING) != 0; error = sppp_ioctl (ifp, cmd, data); if (error) return (error); print (("cxioctl (%d.%d, ", c->board->num, c->num)); switch (cmd) { default: print (("0x%x)\n", cmd)); return (0); case SIOCADDMULTI: print (("SIOCADDMULTI)\n")); return (0); case SIOCDELMULTI: print (("SIOCDELMULTI)\n")); return (0); case SIOCSIFFLAGS: print (("SIOCSIFFLAGS)\n")); break; case SIOCSIFADDR: print (("SIOCSIFADDR)\n")); break; } /* We get here only in case of SIFFLAGS or SIFADDR. */ s = splimp (); should_be_up = (ifp->if_flags & IFF_RUNNING) != 0; if (!was_up && should_be_up) { /* Interface goes up -- start it. */ cxup (c); /* Start all slave subchannels. */ for (q=c->slaveq; q; q=q->slaveq) cxup (q); cxstart (c->ifp); } else if (was_up && !should_be_up) { /* Interface is going down -- stop it. */ cxdown (c); /* Stop all slave subchannels. */ for (q=c->slaveq; q; q=q->slaveq) cxdown (q); /* Flush the interface output queue */ if (! c->sopt.ext) sppp_flush (c->ifp); } splx (s); return (0); } /* * Stop the interface. Called on splimp(). */ static void cxdown (cx_chan_t *c) { unsigned short port = c->chip->port; print (("cx%d.%d: cxdown\n", c->board->num, c->num)); /* The interface is down, stop it */ c->ifp->if_flags &= ~IFF_OACTIVE; /* Reset the channel (for sync modes only) */ outb (CAR(port), c->num & 3); outb (STCR(port), STC_ABORTTX | STC_SNDSPC); cx_setup_chan (c); } /* * Start the interface. Called on splimp(). */ static void cxup (cx_chan_t *c) { unsigned short port = c->chip->port; /* The interface is up, start it */ print (("cx%d.%d: cxup\n", c->board->num, c->num)); /* Initialize channel, enable receiver and transmitter */ cx_cmd (port, CCR_INITCH | CCR_ENRX | CCR_ENTX); /* Repeat the command, to avoid the rev.H bug */ cx_cmd (port, CCR_INITCH | CCR_ENRX | CCR_ENTX); /* Start receiver */ outw (ARBCNT(port), DMABUFSZ); outb (ARBSTS(port), BSTS_OWN24); outw (BRBCNT(port), DMABUFSZ); outb (BRBSTS(port), BSTS_OWN24); /* Raise DTR and RTS */ cx_chan_dtr (c, 1); cx_chan_rts (c, 1); /* Enable interrupts */ outb (IER(port), IER_RXD | IER_TXD); } /* * Fill transmitter buffer with data. */ static void cxput (cx_chan_t *c, char b) { struct mbuf *m; unsigned char *buf; unsigned short port = c->chip->port, len, cnt_port, sts_port; /* Choose the buffer. */ if (b == 'A') { buf = c->atbuf; cnt_port = ATBCNT(port); sts_port = ATBSTS(port); } else { buf = c->btbuf; cnt_port = BTBCNT(port); sts_port = BTBSTS(port); } /* Is it busy? */ if (inb (sts_port) & BSTS_OWN24) { if (c->ifp->if_flags & IFF_DEBUG) print (("cx%d.%d: tbuf %c already busy, bsts=%b\n", c->board->num, c->num, b, inb (sts_port), BSTS_BITS)); goto ret; } /* Get the packet to send. */ m = sppp_dequeue (c->master); if (! m) return; len = m->m_pkthdr.len; /* Count the transmitted bytes to the subchannel, not the master. */ c->master->if_obytes -= len + 3; c->ifp->if_obytes += len + 3; c->stat->obytes += len + 3; if (len >= DMABUFSZ) { printf ("cx%d.%d: too long packet: %d bytes: ", c->board->num, c->num, len); printmbuf (m); m_freem (m); return; } m_copydata (m, 0, len, buf); #if NBPFILTER > 0 if (c->ifp->if_bpf) bpf_mtap (c->ifp, m); #endif m_freem (m); /* Start transmitter. */ outw (cnt_port, len); outb (sts_port, BSTS_EOFR | BSTS_INTR | BSTS_OWN24); if (c->ifp->if_flags & IFF_DEBUG) print (("cx%d.%d: enqueue %d bytes to %c\n", c->board->num, c->num, len, buf==c->atbuf ? 'A' : 'B')); ret: c->ifp->if_flags |= IFF_OACTIVE; } /* * Start output on the (slave) interface. Get another datagram to send * off of the interface queue, and copy it to the interface * before starting the output. */ static void cxsend (cx_chan_t *c) { unsigned short port = c->chip->port; if (c->ifp->if_flags & IFF_DEBUG) print (("cx%d.%d: cxsend\n", c->board->num, c->num)); /* No output if the interface is down. */ if (! (c->ifp->if_flags & IFF_RUNNING)) return; /* Set the current channel number. */ outb (CAR(port), c->num & 3); /* Determine the buffer order. */ if (inb (DMABSTS(port)) & DMABSTS_NTBUF) { cxput (c, 'B'); cxput (c, 'A'); } else { cxput (c, 'A'); cxput (c, 'B'); } /* Set up transmit timeout. */ if (c->master->if_flags & IFF_OACTIVE) c->master->if_timer = TXTIMEOUT; /* * Enable TXMPTY interrupt, * to catch the case when the second buffer is empty. */ if ((inb (ATBSTS(port)) & BSTS_OWN24) && (inb (BTBSTS(port)) & BSTS_OWN24)) { outb (IER(port), IER_RXD | IER_TXD | IER_TXMPTY); } else outb (IER(port), IER_RXD | IER_TXD); } /* * Start output on the (master) interface and all slave interfaces. * Always called on splimp(). */ static void cxstart (struct ifnet *ifp) { cx_chan_t *q, *c = ifp->if_softc; if (c->ifp->if_flags & IFF_DEBUG) print (("cx%d.%d: cxstart\n", c->board->num, c->num)); /* Start the master subchannel. */ cxsend (c); /* Start all slave subchannels. */ if (c->slaveq && ! sppp_isempty (c->master)) for (q=c->slaveq; q; q=q->slaveq) if ((q->ifp->if_flags & IFF_RUNNING) && ! (q->ifp->if_flags & IFF_OACTIVE)) cxsend (q); } /* * Handle transmit timeouts. * Recover after lost transmit interrupts. * Always called on splimp(). */ static void cxwatchdog (struct ifnet *ifp) { cx_chan_t *q, *c = ifp->if_softc; if (! (ifp->if_flags & IFF_RUNNING)) return; if (ifp->if_flags & IFF_DEBUG) printf ("cx%d.%d: device timeout\n", c->board->num, c->num); cxdown (c); for (q=c->slaveq; q; q=q->slaveq) cxdown (q); cxup (c); for (q=c->slaveq; q; q=q->slaveq) cxup (q); cxstart (ifp); } /* * Handle receive interrupts, including receive errors and * receive timeout interrupt. */ static void cxrinth (cx_chan_t *c) { unsigned short port = c->chip->port; unsigned short len, risr = inw (RISR(port)); /* Receive errors. */ if (risr & (RIS_BUSERR | RIS_OVERRUN | RISH_CRCERR | RISH_RXABORT)) { if (c->ifp->if_flags & IFF_DEBUG) printf ("cx%d.%d: receive error, risr=%b\n", c->board->num, c->num, risr, RISH_BITS); ++c->ifp->if_ierrors; ++c->stat->ierrs; if (risr & RIS_OVERRUN) ++c->ifp->if_collisions; } else if (risr & RIS_EOBUF) { if (c->ifp->if_flags & IFF_DEBUG) print (("cx%d.%d: hdlc receive interrupt, risr=%b, arbsts=%b, brbsts=%b\n", c->board->num, c->num, risr, RISH_BITS, inb (ARBSTS(port)), BSTS_BITS, inb (BRBSTS(port)), BSTS_BITS)); ++c->stat->ipkts; /* Handle received data. */ len = (risr & RIS_BB) ? inw(BRBCNT(port)) : inw(ARBCNT(port)); c->stat->ibytes += len; if (len > DMABUFSZ) { /* Fatal error: actual DMA transfer size * exceeds our buffer size. It could be caused * by incorrectly programmed DMA register or * hardware fault. Possibly, should panic here. */ printf ("cx%d.%d: panic! DMA buffer overflow: %d bytes\n", c->board->num, c->num, len); ++c->ifp->if_ierrors; } else if (! (risr & RIS_EOFR)) { /* The received frame does not fit in the DMA buffer. * It could be caused by serial lie noise, * or if the peer has too big MTU. */ if (c->ifp->if_flags & IFF_DEBUG) printf ("cx%d.%d: received frame length exceeds MTU, risr=%b\n", c->board->num, c->num, risr, RISH_BITS); ++c->ifp->if_ierrors; } else { /* Valid frame received. */ if (c->ifp->if_flags & IFF_DEBUG) print (("cx%d.%d: hdlc received %d bytes\n", c->board->num, c->num, len)); cxinput (c, (risr & RIS_BB) ? c->brbuf : c->arbuf, len); ++c->ifp->if_ipackets; } } else if (c->ifp->if_flags & IFF_DEBUG) { print (("cx%d.%d: unknown hdlc receive interrupt, risr=%b\n", c->board->num, c->num, risr, RISH_BITS)); ++c->stat->ierrs; } /* Restart receiver. */ if (! (inb (ARBSTS(port)) & BSTS_OWN24)) { outw (ARBCNT(port), DMABUFSZ); outb (ARBSTS(port), BSTS_OWN24); } if (! (inb (BRBSTS(port)) & BSTS_OWN24)) { outw (BRBCNT(port), DMABUFSZ); outb (BRBSTS(port), BSTS_OWN24); } } /* * Handle transmit interrupt. */ static int cxtinth (cx_chan_t *c) { unsigned short port = c->chip->port; unsigned char tisr = inb (TISR(port)); unsigned char teoir = 0; c->ifp->if_flags &= ~IFF_OACTIVE; if (c->ifp == c->master) c->ifp->if_timer = 0; if (tisr & (TIS_BUSERR | TIS_UNDERRUN)) { /* if (c->ifp->if_flags & IFF_DEBUG) */ print (("cx%d.%d: transmit error, tisr=%b, atbsts=%b, btbsts=%b\n", c->board->num, c->num, tisr, TIS_BITS, inb (ATBSTS(port)), BSTS_BITS, inb (BTBSTS(port)), BSTS_BITS)); ++c->ifp->if_oerrors; ++c->stat->oerrs; /* Terminate the failed buffer. */ /* teoir = TEOI_TERMBUFF; */ } else if (c->ifp->if_flags & IFF_DEBUG) print (("cx%d.%d: hdlc transmit interrupt, tisr=%b, atbsts=%b, btbsts=%b\n", c->board->num, c->num, tisr, TIS_BITS, inb (ATBSTS(port)), BSTS_BITS, inb (BTBSTS(port)), BSTS_BITS)); if (tisr & TIS_EOFR) { ++c->ifp->if_opackets; ++c->stat->opkts; } /* Start output on the (sub-) channel. */ cxsend (c); return (teoir); } static void cxintr (int bnum) { cx_board_t *b = cxboard + bnum; while (! (inw (BSR(b->port)) & BSR_NOINTR)) { /* Acknowledge the interrupt to enter the interrupt context. */ /* Read the local interrupt vector register. */ unsigned char livr = inb (IACK(b->port, BRD_INTR_LEVEL)); cx_chan_t *c = b->chan + (livr>>2 & 0xf); unsigned short port = c->chip->port; unsigned short eoiport = REOIR(port); unsigned char eoi = 0; if (c->type == T_NONE) { printf ("cx%d.%d: unexpected interrupt, livr=0x%x\n", c->board->num, c->num, livr); continue; /* incorrect channel number? */ } /* print (("cx%d.%d: interrupt, livr=0x%x\n", c->board->num, c->num, livr)); */ /* Clear RTS to stop receiver data flow while we are busy * processing the interrupt, thus avoiding underruns. */ if (! c->sopt.norts) { outb (MSVR_RTS(port), 0); c->rts = 0; } switch (livr & 3) { case LIV_EXCEP: /* receive exception */ case LIV_RXDATA: /* receive interrupt */ ++c->stat->rintr; switch (c->mode) { case M_ASYNC: eoi = cxrinta (c); break; case M_HDLC: cxrinth (c); break; default:; /* No bisync and X.21 yet */ } break; case LIV_TXDATA: /* transmit interrupt */ ++c->stat->tintr; eoiport = TEOIR(port); switch (c->mode) { case M_ASYNC: cxtinta (c); break; case M_HDLC: eoi = cxtinth (c); break; default:; /* No bisync and X.21 yet */ } break; case LIV_MODEM: /* modem/timer interrupt */ ++c->stat->mintr; eoiport = MEOIR(port); cxmint (c); break; } /* Raise RTS for this channel if and only if * both receive buffers are empty. */ if (! c->sopt.norts && (inb (CSR(port)) & CSRA_RXEN) && (inb (ARBSTS(port)) & BSTS_OWN24) && (inb (BRBSTS(port)) & BSTS_OWN24)) { outb (MSVR_RTS(port), MSV_RTS); c->rts = 1; } /* Exit from interrupt context. */ outb (eoiport, eoi); /* Master channel - start output on all idle subchannels. */ if (c->master == c->ifp && c->slaveq && (livr & 3) == LIV_TXDATA && c->mode == M_HDLC && ! sppp_isempty (c->ifp)) { cx_chan_t *q; for (q=c->slaveq; q; q=q->slaveq) if ((q->ifp->if_flags & IFF_RUNNING) && ! (q->ifp->if_flags & IFF_OACTIVE)) cxsend (q); } } } /* * Process the received packet. */ static void cxinput (cx_chan_t *c, void *buf, unsigned len) { /* Make an mbuf. */ struct mbuf *m = makembuf (buf, len); if (! m) { if (c->ifp->if_flags & IFF_DEBUG) printf ("cx%d.%d: no memory for packet\n", c->board->num, c->num); ++c->ifp->if_iqdrops; return; } m->m_pkthdr.rcvif = c->master; #ifdef DEBUG if (c->ifp->if_flags & IFF_DEBUG) printmbuf (m); #endif #if NBPFILTER > 0 /* * Check if there's a BPF listener on this interface. * If so, hand off the raw packet to bpf. */ if (c->ifp->if_bpf) bpf_tap (c->ifp, buf, len); #endif /* Count the received bytes to the subchannel, not the master. */ c->master->if_ibytes -= len + 3; c->ifp->if_ibytes += len + 3; sppp_input (c->master, m); } void cxswitch (cx_chan_t *c, cx_soft_opt_t new) { new.ext = 0; if (! new.ext) { struct sppp *sp = (struct sppp*) c->ifp; if (new.cisco) sp->pp_flags |= PP_CISCO; else sp->pp_flags &= ~PP_CISCO; if (new.keepalive) sp->pp_flags |= PP_KEEPALIVE; else sp->pp_flags &= ~PP_KEEPALIVE; } c->sopt = new; }