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Annotation of 43BSD/sys/vaxif/if_acc.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)if_acc.c    7.1 (Berkeley) 6/5/86
        !             7:  */
        !             8: 
        !             9: #include "acc.h"
        !            10: #if NACC > 0
        !            11: 
        !            12: /*
        !            13:  * ACC LH/DH ARPAnet IMP interface driver.
        !            14:  */
        !            15: #include "../machine/pte.h"
        !            16: 
        !            17: #include "param.h"
        !            18: #include "systm.h"
        !            19: #include "mbuf.h"
        !            20: #include "buf.h"
        !            21: #include "protosw.h"
        !            22: #include "socket.h"
        !            23: #include "vmmac.h"
        !            24: 
        !            25: #include "../net/if.h"
        !            26: #include "../netimp/if_imp.h"
        !            27: 
        !            28: #include "../vax/cpu.h"
        !            29: #include "../vax/mtpr.h"
        !            30: #include "if_accreg.h"
        !            31: #include "if_uba.h"
        !            32: #include "../vaxuba/ubareg.h"
        !            33: #include "../vaxuba/ubavar.h"
        !            34: 
        !            35: int     accprobe(), accattach(), accrint(), accxint();
        !            36: struct  uba_device *accinfo[NACC];
        !            37: u_short accstd[] = { 0 };
        !            38: struct  uba_driver accdriver =
        !            39:        { accprobe, 0, accattach, 0, accstd, "acc", accinfo };
        !            40: #define        ACCUNIT(x)      minor(x)
        !            41: 
        !            42: int    accinit(), accstart(), accreset();
        !            43: 
        !            44: /*
        !            45:  * "Lower half" of IMP interface driver.
        !            46:  *
        !            47:  * Each IMP interface is handled by a common module which handles
        !            48:  * the IMP-host protocol and a hardware driver which manages the
        !            49:  * hardware specific details of talking with the IMP.
        !            50:  *
        !            51:  * The hardware portion of the IMP driver handles DMA and related
        !            52:  * management of UNIBUS resources.  The IMP protocol module interprets
        !            53:  * contents of these messages and "controls" the actions of the
        !            54:  * hardware module during IMP resets, but not, for instance, during
        !            55:  * UNIBUS resets.
        !            56:  *
        !            57:  * The two modules are coupled at "attach time", and ever after,
        !            58:  * through the imp interface structure.  Higher level protocols,
        !            59:  * e.g. IP, interact with the IMP driver, rather than the ACC.
        !            60:  */
        !            61: struct acc_softc {
        !            62:        struct  ifnet *acc_if;          /* pointer to IMP's ifnet struct */
        !            63:        struct  impcb *acc_ic;          /* data structure shared with IMP */
        !            64:        struct  ifuba acc_ifuba;        /* UNIBUS resources */
        !            65:        struct  mbuf *acc_iq;           /* input reassembly queue */
        !            66:        short   acc_olen;               /* size of last message sent */
        !            67:        char    acc_flush;              /* flush remainder of message */
        !            68: } acc_softc[NACC];
        !            69: 
        !            70: /*
        !            71:  * Reset the IMP and cause a transmitter interrupt by
        !            72:  * performing a null DMA.
        !            73:  */
        !            74: accprobe(reg)
        !            75:        caddr_t reg;
        !            76: {
        !            77:        register int br, cvec;          /* r11, r10 value-result */
        !            78:        register struct accdevice *addr = (struct accdevice *)reg;
        !            79: 
        !            80: #ifdef lint
        !            81:        br = 0; cvec = br; br = cvec;
        !            82:        accrint(0); accxint(0);
        !            83: #endif
        !            84:        addr->icsr = ACC_RESET; DELAY(5000);
        !            85:        addr->ocsr = ACC_RESET; DELAY(5000);
        !            86:        addr->ocsr = OUT_BBACK; DELAY(5000);
        !            87:        addr->owc = 0;
        !            88:        addr->ocsr = ACC_IE | ACC_GO; DELAY(5000);
        !            89:        addr->ocsr = 0;
        !            90:        if (cvec && cvec != 0x200)      /* transmit -> receive */
        !            91:                cvec -= 4;
        !            92:        return (1);
        !            93: }
        !            94: 
        !            95: /*
        !            96:  * Call the IMP module to allow it to set up its internal
        !            97:  * state, then tie the two modules together by setting up
        !            98:  * the back pointers to common data structures.
        !            99:  */
        !           100: accattach(ui)
        !           101:        struct uba_device *ui;
        !           102: {
        !           103:        register struct acc_softc *sc = &acc_softc[ui->ui_unit];
        !           104:        register struct impcb *ip;
        !           105:        struct ifimpcb {
        !           106:                struct  ifnet ifimp_if;
        !           107:                struct  impcb ifimp_impcb;
        !           108:        } *ifimp;
        !           109: 
        !           110:        if ((ifimp = (struct ifimpcb *)impattach(ui, accreset)) == 0)
        !           111:                return;
        !           112:        sc->acc_if = &ifimp->ifimp_if;
        !           113:        ip = &ifimp->ifimp_impcb;
        !           114:        sc->acc_ic = ip;
        !           115:        ip->ic_init = accinit;
        !           116:        ip->ic_start = accstart;
        !           117:        sc->acc_ifuba.ifu_flags = UBA_CANTWAIT;
        !           118: #ifdef notdef
        !           119:        sc->acc_ifuba.ifu_flags |= UBA_NEEDBDP;
        !           120: #endif
        !           121: }
        !           122: 
        !           123: /*
        !           124:  * Reset interface after UNIBUS reset.
        !           125:  * If interface is on specified uba, reset its state.
        !           126:  */
        !           127: accreset(unit, uban)
        !           128:        int unit, uban;
        !           129: {
        !           130:        register struct uba_device *ui;
        !           131:        struct acc_softc *sc;
        !           132: 
        !           133:        if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           134:            ui->ui_ubanum != uban)
        !           135:                return;
        !           136:        printf(" acc%d", unit);
        !           137:        sc = &acc_softc[unit];
        !           138:        sc->acc_if->if_flags &= ~IFF_RUNNING;
        !           139:        /* must go through IMP to allow it to set state */
        !           140:        (*sc->acc_if->if_init)(unit);
        !           141: }
        !           142: 
        !           143: /*
        !           144:  * Initialize interface: clear recorded pending operations,
        !           145:  * and retrieve, and initialize UNIBUS resources.  Note
        !           146:  * return value is used by IMP init routine to mark IMP
        !           147:  * unavailable for outgoing traffic.
        !           148:  */
        !           149: accinit(unit)
        !           150:        int unit;
        !           151: {      
        !           152:        register struct acc_softc *sc;
        !           153:        register struct uba_device *ui;
        !           154:        register struct accdevice *addr;
        !           155:        int info;
        !           156: 
        !           157:        if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) {
        !           158:                printf("acc%d: not alive\n", unit);
        !           159:                return (0);
        !           160:        }
        !           161:        sc = &acc_softc[unit];
        !           162:        /*
        !           163:         * Header length is 0 since we have to passs
        !           164:         * the IMP leader up to the protocol interpretation
        !           165:         * routines.  If we had the header length as
        !           166:         * sizeof(struct imp_leader), then the if_ routines
        !           167:         * would asssume we handle it on input and output.
        !           168:         */
        !           169:        if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0,
        !           170:             (int)btoc(IMPMTU+2)) == 0) {
        !           171:                printf("acc%d: can't initialize\n", unit);
        !           172:                ui->ui_alive = 0;
        !           173:                sc->acc_if->if_flags &= ~(IFF_UP | IFF_RUNNING);
        !           174:                return (0);
        !           175:        }
        !           176:        sc->acc_if->if_flags |= IFF_RUNNING;
        !           177:        addr = (struct accdevice *)ui->ui_addr;
        !           178: 
        !           179:        /*
        !           180:         * Reset the imp interface;
        !           181:         * the delays are pure guesswork.
        !           182:         */
        !           183:         addr->ocsr = ACC_RESET; DELAY(5000);
        !           184:        addr->ocsr = OUT_BBACK; DELAY(5000);    /* reset host master ready */
        !           185:        addr->ocsr = 0;
        !           186:        if (accinputreset(addr, unit) == 0) {
        !           187:                ui->ui_alive = 0;
        !           188:                return (0);
        !           189:        }
        !           190: 
        !           191:        /*
        !           192:         * Put up a read.  We can't restart any outstanding writes
        !           193:         * until we're back in synch with the IMP (i.e. we've flushed
        !           194:         * the NOOPs it throws at us).
        !           195:         * Note: IMPMTU includes the leader.
        !           196:         */
        !           197:        info = sc->acc_ifuba.ifu_r.ifrw_info;
        !           198:        addr->iba = (u_short)info;
        !           199:        addr->iwc = -((IMPMTU + 2) >> 1);
        !           200: #ifdef LOOPBACK
        !           201:        addr->ocsr |= OUT_BBACK;
        !           202: #endif
        !           203:        addr->icsr = 
        !           204:                IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
        !           205:        return (1);
        !           206: }
        !           207: 
        !           208: accinputreset(addr, unit)
        !           209:        register struct accdevice *addr;
        !           210:        register int unit;
        !           211: {
        !           212:        register int i;
        !           213: 
        !           214:        addr->icsr = ACC_RESET; DELAY(5000);
        !           215:        addr->icsr = IN_MRDY | IN_WEN;          /* close the relay */
        !           216:        DELAY(10000);
        !           217:        /* YECH!!! */
        !           218:        for (i = 0; i < 500; i++) {
        !           219:                if ((addr->icsr & IN_HRDY) ||
        !           220:                    (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0)
        !           221:                        return (1);
        !           222:                addr->icsr = IN_MRDY | IN_WEN; DELAY(10000);
        !           223:                /* keep turning IN_RMR off */
        !           224:        }
        !           225:        printf("acc%d: imp doesn't respond, icsr=%b\n", unit,
        !           226:                addr->icsr, ACC_INBITS);
        !           227:        return (0);
        !           228: }
        !           229: 
        !           230: /*
        !           231:  * Start output on an interface.
        !           232:  */
        !           233: accstart(dev)
        !           234:        dev_t dev;
        !           235: {
        !           236:        int unit = ACCUNIT(dev), info;
        !           237:        register struct acc_softc *sc = &acc_softc[unit];
        !           238:        register struct accdevice *addr;
        !           239:        struct mbuf *m;
        !           240:        u_short cmd;
        !           241: 
        !           242:        if (sc->acc_ic->ic_oactive)
        !           243:                goto restart;
        !           244:        
        !           245:        /*
        !           246:         * Not already active, deqeue a request and
        !           247:         * map it onto the UNIBUS.  If no more
        !           248:         * requeusts, just return.
        !           249:         */
        !           250:        IF_DEQUEUE(&sc->acc_if->if_snd, m);
        !           251:        if (m == 0) {
        !           252:                sc->acc_ic->ic_oactive = 0;
        !           253:                return;
        !           254:        }
        !           255:        sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);
        !           256: 
        !           257: restart:
        !           258:        /*
        !           259:         * Have request mapped to UNIBUS for
        !           260:         * transmission; start the output.
        !           261:         */
        !           262:        if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
        !           263:                UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
        !           264:        addr = (struct accdevice *)accinfo[unit]->ui_addr;
        !           265:        info = sc->acc_ifuba.ifu_w.ifrw_info;
        !           266:        addr->oba = (u_short)info;
        !           267:        addr->owc = -((sc->acc_olen + 1) >> 1);
        !           268:        cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO;
        !           269: #ifdef LOOPBACK
        !           270:        cmd |= OUT_BBACK;
        !           271: #endif
        !           272:        addr->ocsr = cmd;
        !           273:        sc->acc_ic->ic_oactive = 1;
        !           274: }
        !           275: 
        !           276: /*
        !           277:  * Output interrupt handler.
        !           278:  */
        !           279: accxint(unit)
        !           280:        int unit;
        !           281: {
        !           282:        register struct acc_softc *sc = &acc_softc[unit];
        !           283:        register struct accdevice *addr;
        !           284: 
        !           285:        addr = (struct accdevice *)accinfo[unit]->ui_addr;
        !           286:        if (sc->acc_ic->ic_oactive == 0) {
        !           287:                printf("acc%d: stray xmit interrupt, csr=%b\n", unit,
        !           288:                        addr->ocsr, ACC_OUTBITS);
        !           289:                return;
        !           290:        }
        !           291:        sc->acc_if->if_opackets++;
        !           292:        sc->acc_ic->ic_oactive = 0;
        !           293:        if (addr->ocsr & ACC_ERR) {
        !           294:                printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit,
        !           295:                        addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS);
        !           296:                sc->acc_if->if_oerrors++;
        !           297:        }
        !           298:        if (sc->acc_ifuba.ifu_xtofree) {
        !           299:                m_freem(sc->acc_ifuba.ifu_xtofree);
        !           300:                sc->acc_ifuba.ifu_xtofree = 0;
        !           301:        }
        !           302:        if (sc->acc_if->if_snd.ifq_head)
        !           303:                accstart(unit);
        !           304: }
        !           305: 
        !           306: /*
        !           307:  * Input interrupt handler
        !           308:  */
        !           309: accrint(unit)
        !           310:        int unit;
        !           311: {
        !           312:        register struct acc_softc *sc = &acc_softc[unit];
        !           313:        register struct accdevice *addr;
        !           314:        struct mbuf *m;
        !           315:        int len, info;
        !           316: 
        !           317:        addr = (struct accdevice *)accinfo[unit]->ui_addr;
        !           318:        sc->acc_if->if_ipackets++;
        !           319: 
        !           320:        /*
        !           321:         * Purge BDP; flush message if error indicated.
        !           322:         */
        !           323:        if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
        !           324:                UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
        !           325:        if (addr->icsr & ACC_ERR) {
        !           326:                printf("acc%d: input error, csr=%b\n", unit,
        !           327:                    addr->icsr, ACC_INBITS);
        !           328:                sc->acc_if->if_ierrors++;
        !           329:                sc->acc_flush = 1;
        !           330:        }
        !           331: 
        !           332:        if (sc->acc_flush) {
        !           333:                if (addr->icsr & IN_EOM)
        !           334:                        sc->acc_flush = 0;
        !           335:                goto setup;
        !           336:        }
        !           337:        len = IMPMTU+2 + (addr->iwc << 1);
        !           338:        if (len < 0 || len > IMPMTU+2) {
        !           339:                printf("acc%d: bad length=%d\n", unit, len);
        !           340:                sc->acc_if->if_ierrors++;
        !           341:                goto setup;
        !           342:        }
        !           343: 
        !           344:        /*
        !           345:         * The offset parameter is always 0 since using
        !           346:         * trailers on the ARPAnet is insane.
        !           347:         */
        !           348:        m = if_rubaget(&sc->acc_ifuba, len, 0, sc->acc_if);
        !           349:        if (m == 0)
        !           350:                goto setup;
        !           351:        if ((addr->icsr & IN_EOM) == 0) {
        !           352:                if (sc->acc_iq)
        !           353:                        m_cat(sc->acc_iq, m);
        !           354:                else
        !           355:                        sc->acc_iq = m;
        !           356:                goto setup;
        !           357:        }
        !           358:        if (sc->acc_iq) {
        !           359:                m_cat(sc->acc_iq, m);
        !           360:                m = sc->acc_iq;
        !           361:                sc->acc_iq = 0;
        !           362:        }
        !           363:        impinput(unit, m);
        !           364: 
        !           365: setup:
        !           366:        /*
        !           367:         * Setup for next message.
        !           368:         */
        !           369:        info = sc->acc_ifuba.ifu_r.ifrw_info;
        !           370:        addr->iba = (u_short)info;
        !           371:        addr->iwc = -((IMPMTU + 2)>> 1);
        !           372:        addr->icsr =
        !           373:                IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
        !           374: }
        !           375: #endif

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