/*- * Copyright (c) 1990, 1991 William F. Jolitz. * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. * * %sccs.include.redist.c% * * @(#)if_ne.c 8.1 (Berkeley) 06/11/93 */ /* * NE2000 Ethernet driver * * Parts inspired from Tim Tucker's if_wd driver for the wd8003, * insight on the ne2000 gained from Robert Clements PC/FTP driver. */ #include "ne.h" #if NNE > 0 #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #include #include #include #endif #ifdef NS #include #include #endif #include #include #include int neprobe(), neattach(), neintr(); int nestart(),neinit(), ether_output(), neioctl(); struct isa_driver nedriver = { neprobe, neattach, "ne", }; struct mbuf *neget(); #define ETHER_MIN_LEN 64 #define ETHER_MAX_LEN 1536 /* * Ethernet software status per interface. * * Each interface is referenced by a network interface structure, * ns_if, which the routing code uses to locate the interface. * This structure contains the output queue for the interface, its address, ... */ struct ne_softc { struct arpcom ns_ac; /* Ethernet common part */ #define ns_if ns_ac.ac_if /* network-visible interface */ #define ns_addr ns_ac.ac_enaddr /* hardware Ethernet address */ int ns_flags; #define DSF_LOCK 1 /* block re-entering enstart */ int ns_oactive ; int ns_mask ; int ns_ba; /* byte addr in buffer ram of inc pkt */ int ns_cur; /* current page being filled */ struct prhdr ns_ph; /* hardware header of incoming packet*/ struct ether_header ns_eh; /* header of incoming packet */ u_char ns_pb[2048 /*ETHERMTU+sizeof(long)*/]; } ne_softc[NNE] ; #define ENBUFSIZE (sizeof(struct ether_header) + ETHERMTU + 2 + ETHER_MIN_LEN) int nec; u_short boarddata[16]; neprobe(dvp) struct isa_device *dvp; { int val,i,s; register struct ne_softc *ns = &ne_softc[0]; #ifdef lint neintr(0); #endif nec = dvp->id_iobase; s = splimp(); /* Reset the bastard */ val = inb(nec+ne_reset); DELAY(2000000); outb(nec+ne_reset,val); outb(nec+ds_cmd, DSCM_STOP|DSCM_NODMA); i = 1000000; while ((inb(nec+ds0_isr)&DSIS_RESET) == 0 && i-- > 0); if (i < 0) return (0); outb(nec+ds0_isr, 0xff); /* Word Transfers, Burst Mode Select, Fifo at 8 bytes */ outb(nec+ds0_dcr, DSDC_WTS|DSDC_BMS|DSDC_FT1); outb(nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_STOP); DELAY(10000); /* Check cmd reg and fail if not right */ if ((i=inb(nec+ds_cmd)) != (DSCM_NODMA|DSCM_PG0|DSCM_STOP)) return(0); outb(nec+ds0_tcr, 0); outb(nec+ds0_rcr, DSRC_MON); outb(nec+ds0_pstart, RBUF/DS_PGSIZE); outb(nec+ds0_pstop, RBUFEND/DS_PGSIZE); outb(nec+ds0_bnry, RBUFEND/DS_PGSIZE); outb(nec+ds0_imr, 0); outb(nec+ds0_isr, 0); outb(nec+ds_cmd, DSCM_NODMA|DSCM_PG1|DSCM_STOP); outb(nec+ds1_curr, RBUF/DS_PGSIZE); outb(nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_STOP); #ifdef NEDEBUG #define PAT(n) (0xa55a + 37*(n)) #define RCON 37 { int i, rom, pat; rom=1; printf("ne ram "); for (i = 0; i < 0xfff0; i+=4) { pat = PAT(i); neput(&pat,i,4); nefetch(&pat,i,4); if (pat == PAT(i)) { if (rom) { rom=0; printf(" %x", i); } } else { if (!rom) { rom=1; printf("..%x ", i); } } pat=0; neput(&pat,i,4); } printf("\n"); } #endif /* Extract board address */ nefetch ((caddr_t)boarddata, 0, sizeof(boarddata)); for(i=0; i < 6; i++) ns->ns_addr[i] = boarddata[i]; splx(s); return (1); } /* * Fetch from onboard ROM/RAM */ nefetch (up, ad, len) caddr_t up; { u_char cmd; cmd = inb(nec+ds_cmd); outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_START); /* Setup remote dma */ outb (nec+ds0_isr, DSIS_RDC); outb (nec+ds0_rbcr0, len); outb (nec+ds0_rbcr1, len>>8); outb (nec+ds0_rsar0, ad); outb (nec+ds0_rsar1, ad>>8); /* Execute & extract from card */ outb (nec+ds_cmd, DSCM_RREAD|DSCM_PG0|DSCM_START); insw (nec+ne_data, up, len/2); /* Wait till done, then shutdown feature */ while ((inb (nec+ds0_isr) & DSIS_RDC) == 0) ; outb (nec+ds0_isr, DSIS_RDC); outb (nec+ds_cmd, cmd); } /* * Put to onboard RAM */ neput (up, ad, len) caddr_t up; { u_char cmd; cmd = inb(nec+ds_cmd); outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_START); /* Setup for remote dma */ outb (nec+ds0_isr, DSIS_RDC); if(len&1) len++; /* roundup to words */ outb (nec+ds0_rbcr0, len); outb (nec+ds0_rbcr1, len>>8); outb (nec+ds0_rsar0, ad); outb (nec+ds0_rsar1, ad>>8); /* Execute & stuff to card */ outb (nec+ds_cmd, DSCM_RWRITE|DSCM_PG0|DSCM_START); outsw (nec+ne_data, up, len/2); /* Wait till done, then shutdown feature */ while ((inb (nec+ds0_isr) & DSIS_RDC) == 0) ; outb (nec+ds0_isr, DSIS_RDC); outb (nec+ds_cmd, cmd); } /* * Reset of interface. */ nereset(unit, uban) int unit, uban; { if (unit >= NNE) return; printf("ne%d: reset\n", unit); ne_softc[unit].ns_flags &= ~DSF_LOCK; neinit(unit); } /* * Interface exists: make available by filling in network interface * record. System will initialize the interface when it is ready * to accept packets. We get the ethernet address here. */ neattach(dvp) struct isa_device *dvp; { int unit = dvp->id_unit; register struct ne_softc *ns = &ne_softc[unit]; register struct ifnet *ifp = &ns->ns_if; ifp->if_unit = unit; ifp->if_name = nedriver.name ; ifp->if_mtu = ETHERMTU; printf (" ethernet address %s", ether_sprintf(ns->ns_addr)) ; ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS; ifp->if_init = neinit; ifp->if_output = ether_output; ifp->if_start = nestart; ifp->if_ioctl = neioctl; ifp->if_reset = nereset; ifp->if_watchdog = 0; if_attach(ifp); } /* * Initialization of interface; set up initialization block * and transmit/receive descriptor rings. */ neinit(unit) int unit; { register struct ne_softc *ns = &ne_softc[unit]; struct ifnet *ifp = &ns->ns_if; int s; register i; char *cp; if (ifp->if_addrlist == (struct ifaddr *)0) return; if (ifp->if_flags & IFF_RUNNING) return; s = splimp(); /* set physical address on ethernet */ outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG1|DSCM_STOP); for (i=0 ; i < 6 ; i++) outb(nec+ds1_par0+i,ns->ns_addr[i]); /* clr logical address hash filter for now */ for (i=0 ; i < 8 ; i++) outb(nec+ds1_mar0+i,0xff); /* init regs */ outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_STOP); outb (nec+ds0_rbcr0, 0); outb (nec+ds0_rbcr1, 0); outb (nec+ds0_imr, 0); outb (nec+ds0_isr, 0xff); /* Word Transfers, Burst Mode Select, Fifo at 8 bytes */ outb(nec+ds0_dcr, DSDC_WTS|DSDC_BMS|DSDC_FT1); outb(nec+ds0_tcr, 0); outb (nec+ds0_rcr, DSRC_MON); outb (nec+ds0_tpsr, 0); outb(nec+ds0_pstart, RBUF/DS_PGSIZE); outb(nec+ds0_pstop, RBUFEND/DS_PGSIZE); outb(nec+ds0_bnry, RBUF/DS_PGSIZE); outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG1|DSCM_STOP); outb(nec+ds1_curr, RBUF/DS_PGSIZE); ns->ns_cur = RBUF/DS_PGSIZE; outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_START); outb (nec+ds0_rcr, DSRC_AB); outb(nec+ds0_dcr, DSDC_WTS|DSDC_BMS|DSDC_FT1); outb (nec+ds0_imr, 0xff); ns->ns_if.if_flags |= IFF_RUNNING; ns->ns_oactive = 0; ns->ns_mask = ~0; nestart(ifp); splx(s); } /* * Setup output on interface. * Get another datagram to send off of the interface queue, * and map it to the interface before starting the output. * called only at splimp or interrupt level. */ nestart(ifp) struct ifnet *ifp; { register struct ne_softc *ns = &ne_softc[ifp->if_unit]; struct mbuf *m0, *m; int buffer; int len = 0, i, total,t; /* * The DS8390 has only one transmit buffer, if it is busy we * must wait until the transmit interrupt completes. */ outb(nec+ds_cmd,DSCM_NODMA|DSCM_START); if (ns->ns_flags & DSF_LOCK) return; if (inb(nec+ds_cmd) & DSCM_TRANS) return; if ((ns->ns_if.if_flags & IFF_RUNNING) == 0) return; IF_DEQUEUE(&ns->ns_if.if_snd, m); if (m == 0) return; /* * Copy the mbuf chain into the transmit buffer */ ns->ns_flags |= DSF_LOCK; /* prevent entering nestart */ buffer = TBUF; len = i = 0; t = 0; for (m0 = m; m != 0; m = m->m_next) t += m->m_len; m = m0; total = t; for (m0 = m; m != 0; ) { if (m->m_len&1 && t > m->m_len) { neput(mtod(m, caddr_t), buffer, m->m_len - 1); t -= m->m_len - 1; buffer += m->m_len - 1; m->m_data += m->m_len - 1; m->m_len = 1; m = m_pullup(m, 2); } else { neput(mtod(m, caddr_t), buffer, m->m_len); buffer += m->m_len; t -= m->m_len; MFREE(m, m0); m = m0; } } /* * Init transmit length registers, and set transmit start flag. */ len = total; if (len < ETHER_MIN_LEN) len = ETHER_MIN_LEN; outb(nec+ds0_tbcr0,len&0xff); outb(nec+ds0_tbcr1,(len>>8)&0xff); outb(nec+ds0_tpsr, TBUF/DS_PGSIZE); outb(nec+ds_cmd, DSCM_TRANS|DSCM_NODMA|DSCM_START); } /* buffer successor/predecessor in ring? */ #define succ(n) (((n)+1 >= RBUFEND/DS_PGSIZE) ? RBUF/DS_PGSIZE : (n)+1) #define pred(n) (((n)-1 < RBUF/DS_PGSIZE) ? RBUFEND/DS_PGSIZE-1 : (n)-1) /* * Controller interrupt. */ neintr(unit) { register struct ne_softc *ns = &ne_softc[unit]; u_char cmd,isr; /* Save cmd, clear interrupt */ cmd = inb (nec+ds_cmd); loop: isr = inb (nec+ds0_isr); outb(nec+ds_cmd,DSCM_NODMA|DSCM_START); outb(nec+ds0_isr, isr); /* Receiver error */ if (isr & DSIS_RXE) { /* need to read these registers to clear status */ (void) inb(nec+ ds0_rsr); (void) inb(nec+ 0xD); (void) inb(nec + 0xE); (void) inb(nec + 0xF); ns->ns_if.if_ierrors++; } /* We received something; rummage thru tiny ring buffer */ if (isr & (DSIS_RX|DSIS_RXE|DSIS_ROVRN)) { u_char pend,lastfree; outb(nec+ds_cmd, DSCM_START|DSCM_NODMA|DSCM_PG1); pend = inb(nec+ds1_curr); outb(nec+ds_cmd, DSCM_START|DSCM_NODMA|DSCM_PG0); lastfree = inb(nec+ds0_bnry); /* Have we wrapped? */ if (lastfree >= RBUFEND/DS_PGSIZE) lastfree = RBUF/DS_PGSIZE; if (pend < lastfree && ns->ns_cur < pend) lastfree = ns->ns_cur; else if (ns->ns_cur > lastfree) lastfree = ns->ns_cur; /* Something in the buffer? */ while (pend != lastfree) { u_char nxt; /* Extract header from microcephalic board */ nefetch(&ns->ns_ph,lastfree*DS_PGSIZE, sizeof(ns->ns_ph)); ns->ns_ba = lastfree*DS_PGSIZE+sizeof(ns->ns_ph); /* Incipient paranoia */ if (ns->ns_ph.pr_status == DSRS_RPC || /* for dequna's */ ns->ns_ph.pr_status == 0x21) nerecv (ns); #ifdef NEDEBUG else { printf("cur %x pnd %x lfr %x ", ns->ns_cur, pend, lastfree); printf("nxt %x len %x ", ns->ns_ph.pr_nxtpg, (ns->ns_ph.pr_sz1<<8)+ ns->ns_ph.pr_sz0); printf("Bogus Sts %x\n", ns->ns_ph.pr_status); } #endif nxt = ns->ns_ph.pr_nxtpg ; /* Sanity check */ if ( nxt >= RBUF/DS_PGSIZE && nxt <= RBUFEND/DS_PGSIZE && nxt <= pend) ns->ns_cur = nxt; else ns->ns_cur = nxt = pend; /* Set the boundaries */ lastfree = nxt; outb(nec+ds0_bnry, pred(nxt)); outb(nec+ds_cmd, DSCM_START|DSCM_NODMA|DSCM_PG1); pend = inb(nec+ds1_curr); outb(nec+ds_cmd, DSCM_START|DSCM_NODMA|DSCM_PG0); } outb(nec+ds_cmd, DSCM_START|DSCM_NODMA); } /* Transmit error */ if (isr & DSIS_TXE) { ns->ns_flags &= ~DSF_LOCK; /* Need to read these registers to clear status */ ns->ns_if.if_collisions += inb(nec+ds0_tbcr0); ns->ns_if.if_oerrors++; } /* Packet Transmitted */ if (isr & DSIS_TX) { ns->ns_flags &= ~DSF_LOCK; ++ns->ns_if.if_opackets; ns->ns_if.if_collisions += inb(nec+ds0_tbcr0); } /* Receiver ovverun? */ if (isr & DSIS_ROVRN) { log(LOG_ERR, "ne%d: error: isr %x\n", ns-ne_softc, isr /*, DSIS_BITS*/); outb(nec+ds0_rbcr0, 0); outb(nec+ds0_rbcr1, 0); outb(nec+ds0_tcr, DSTC_LB0); outb(nec+ds0_rcr, DSRC_MON); outb(nec+ds_cmd, DSCM_START|DSCM_NODMA); outb(nec+ds0_rcr, DSRC_AB); outb(nec+ds0_tcr, 0); } /* Any more to send? */ outb (nec+ds_cmd, DSCM_NODMA|DSCM_PG0|DSCM_START); nestart(&ns->ns_if); outb (nec+ds_cmd, cmd); outb (nec+ds0_imr, 0xff); /* Still more to do? */ isr = inb (nec+ds0_isr); if(isr) goto loop; } /* * Ethernet interface receiver interface. * If input error just drop packet. * Otherwise examine packet to determine type. If can't determine length * from type, then have to drop packet. Othewise decapsulate * packet based on type and pass to type specific higher-level * input routine. */ nerecv(ns) register struct ne_softc *ns; { int len,i; ns->ns_if.if_ipackets++; len = ns->ns_ph.pr_sz0 + (ns->ns_ph.pr_sz1<<8); if(len < ETHER_MIN_LEN || len > ETHER_MAX_LEN) return; /* this need not be so torturous - one/two bcopys at most into mbufs */ nefetch(ns->ns_pb, ns->ns_ba, min(len,DS_PGSIZE-sizeof(ns->ns_ph))); if (len > DS_PGSIZE-sizeof(ns->ns_ph)) { int l = len - (DS_PGSIZE-sizeof(ns->ns_ph)), b ; u_char *p = ns->ns_pb + (DS_PGSIZE-sizeof(ns->ns_ph)); if(++ns->ns_cur > 0x7f) ns->ns_cur = 0x46; b = ns->ns_cur*DS_PGSIZE; while (l >= DS_PGSIZE) { nefetch(p, b, DS_PGSIZE); p += DS_PGSIZE; l -= DS_PGSIZE; if(++ns->ns_cur > 0x7f) ns->ns_cur = 0x46; b = ns->ns_cur*DS_PGSIZE; } if (l > 0) nefetch(p, b, l); } /* don't forget checksum! */ len -= sizeof(struct ether_header) + sizeof(long); neread(ns,(caddr_t)(ns->ns_pb), len); } /* * Pass a packet to the higher levels. * We deal with the trailer protocol here. */ neread(ns, buf, len) register struct ne_softc *ns; char *buf; int len; { register struct ether_header *eh; struct mbuf *m; int off, resid; register struct ifqueue *inq; /* * Deal with trailer protocol: if type is trailer type * get true type from first 16-bit word past data. * Remember that type was trailer by setting off. */ eh = (struct ether_header *)buf; eh->ether_type = ntohs((u_short)eh->ether_type); #define nedataaddr(eh, off, type) ((type)(((caddr_t)((eh)+1)+(off)))) if (eh->ether_type >= ETHERTYPE_TRAIL && eh->ether_type < ETHERTYPE_TRAIL+ETHERTYPE_NTRAILER) { off = (eh->ether_type - ETHERTYPE_TRAIL) * 512; if (off >= ETHERMTU) return; /* sanity */ eh->ether_type = ntohs(*nedataaddr(eh, off, u_short *)); resid = ntohs(*(nedataaddr(eh, off+2, u_short *))); if (off + resid > len) return; /* sanity */ len = off + resid; } else off = 0; if (len == 0) return; /* * Pull packet off interface. Off is nonzero if packet * has trailing header; neget will then force this header * information to be at the front, but we still have to drop * the type and length which are at the front of any trailer data. */ m = neget(buf, len, off, &ns->ns_if); if (m == 0) return; ether_input(&ns->ns_if, eh, m); } /* * Supporting routines */ /* * Pull read data off a interface. * Len is length of data, with local net header stripped. * Off is non-zero if a trailer protocol was used, and * gives the offset of the trailer information. * We copy the trailer information and then all the normal * data into mbufs. When full cluster sized units are present * we copy into clusters. */ struct mbuf * neget(buf, totlen, off0, ifp) caddr_t buf; int totlen, off0; struct ifnet *ifp; { struct mbuf *top, **mp, *m, *p; int off = off0, len; register caddr_t cp = buf; char *epkt; buf += sizeof(struct ether_header); cp = buf; epkt = cp + totlen; if (off) { cp += off + 2 * sizeof(u_short); totlen -= 2 * sizeof(u_short); } MGETHDR(m, M_DONTWAIT, MT_DATA); if (m == 0) return (0); m->m_pkthdr.rcvif = ifp; m->m_pkthdr.len = totlen; m->m_len = MHLEN; top = 0; mp = ⊤ while (totlen > 0) { if (top) { MGET(m, M_DONTWAIT, MT_DATA); if (m == 0) { m_freem(top); return (0); } m->m_len = MLEN; } len = min(totlen, epkt - cp); if (len >= MINCLSIZE) { MCLGET(m, M_DONTWAIT); if (m->m_flags & M_EXT) m->m_len = len = min(len, MCLBYTES); else len = m->m_len; } else { /* * Place initial small packet/header at end of mbuf. */ if (len < m->m_len) { if (top == 0 && len + max_linkhdr <= m->m_len) m->m_data += max_linkhdr; m->m_len = len; } else len = m->m_len; } bcopy(cp, mtod(m, caddr_t), (unsigned)len); cp += len; *mp = m; mp = &m->m_next; totlen -= len; if (cp == epkt) cp = buf; } return (top); } /* * Process an ioctl request. */ neioctl(ifp, cmd, data) register struct ifnet *ifp; int cmd; caddr_t data; { register struct ifaddr *ifa = (struct ifaddr *)data; struct ne_softc *ns = &ne_softc[ifp->if_unit]; struct ifreq *ifr = (struct ifreq *)data; int s = splimp(), error = 0; switch (cmd) { case SIOCSIFADDR: ifp->if_flags |= IFF_UP; switch (ifa->ifa_addr->sa_family) { #ifdef INET case AF_INET: neinit(ifp->if_unit); /* before arpwhohas */ ((struct arpcom *)ifp)->ac_ipaddr = IA_SIN(ifa)->sin_addr; arpwhohas((struct arpcom *)ifp, &IA_SIN(ifa)->sin_addr); break; #endif #ifdef NS case AF_NS: { register struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr); if (ns_nullhost(*ina)) ina->x_host = *(union ns_host *)(ns->ns_addr); else { /* * The manual says we can't change the address * while the receiver is armed, * so reset everything */ ifp->if_flags &= ~IFF_RUNNING; bcopy((caddr_t)ina->x_host.c_host, (caddr_t)ns->ns_addr, sizeof(ns->ns_addr)); } neinit(ifp->if_unit); /* does ne_setaddr() */ break; } #endif default: neinit(ifp->if_unit); break; } break; case SIOCSIFFLAGS: if ((ifp->if_flags & IFF_UP) == 0 && ifp->if_flags & IFF_RUNNING) { ifp->if_flags &= ~IFF_RUNNING; outb(nec+ds_cmd,DSCM_STOP|DSCM_NODMA); } else if (ifp->if_flags & IFF_UP && (ifp->if_flags & IFF_RUNNING) == 0) neinit(ifp->if_unit); break; #ifdef notdef case SIOCGHWADDR: bcopy((caddr_t)ns->ns_addr, (caddr_t) &ifr->ifr_data, sizeof(ns->ns_addr)); break; #endif default: error = EINVAL; } splx(s); return (error); } #endif