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Annotation of 42BSD/sys/vaxif/if_acc.c, revision 1.1

1.1     ! root        1: /*     if_acc.c        6.1     83/07/29        */
        !             2: 
        !             3: #include "acc.h"
        !             4: #ifdef NACC > 0
        !             5: 
        !             6: /*
        !             7:  * ACC LH/DH ARPAnet IMP interface driver.
        !             8:  */
        !             9: #include "../machine/pte.h"
        !            10: 
        !            11: #include "../h/param.h"
        !            12: #include "../h/systm.h"
        !            13: #include "../h/mbuf.h"
        !            14: #include "../h/buf.h"
        !            15: #include "../h/protosw.h"
        !            16: #include "../h/socket.h"
        !            17: #include "../h/vmmac.h"
        !            18: 
        !            19: #include "../net/if.h"
        !            20: #include "../netimp/if_imp.h"
        !            21: 
        !            22: #include "../vax/cpu.h"
        !            23: #include "../vax/mtpr.h"
        !            24: #include "../vaxif/if_accreg.h"
        !            25: #include "../vaxif/if_uba.h"
        !            26: #include "../vaxuba/ubareg.h"
        !            27: #include "../vaxuba/ubavar.h"
        !            28: 
        !            29: int     accprobe(), accattach(), accrint(), accxint();
        !            30: struct  uba_device *accinfo[NACC];
        !            31: u_short accstd[] = { 0 };
        !            32: struct  uba_driver accdriver =
        !            33:        { accprobe, 0, accattach, 0, accstd, "acc", accinfo };
        !            34: #define        ACCUNIT(x)      minor(x)
        !            35: 
        !            36: int    accinit(), accstart(), accreset();
        !            37: 
        !            38: /*
        !            39:  * "Lower half" of IMP interface driver.
        !            40:  *
        !            41:  * Each IMP interface is handled by a common module which handles
        !            42:  * the IMP-host protocol and a hardware driver which manages the
        !            43:  * hardware specific details of talking with the IMP.
        !            44:  *
        !            45:  * The hardware portion of the IMP driver handles DMA and related
        !            46:  * management of UNIBUS resources.  The IMP protocol module interprets
        !            47:  * contents of these messages and "controls" the actions of the
        !            48:  * hardware module during IMP resets, but not, for instance, during
        !            49:  * UNIBUS resets.
        !            50:  *
        !            51:  * The two modules are coupled at "attach time", and ever after,
        !            52:  * through the imp interface structure.  Higher level protocols,
        !            53:  * e.g. IP, interact with the IMP driver, rather than the ACC.
        !            54:  */
        !            55: struct acc_softc {
        !            56:        struct  ifnet *acc_if;          /* pointer to IMP's ifnet struct */
        !            57:        struct  impcb *acc_ic;          /* data structure shared with IMP */
        !            58:        struct  ifuba acc_ifuba;        /* UNIBUS resources */
        !            59:        struct  mbuf *acc_iq;           /* input reassembly queue */
        !            60:        short   acc_olen;               /* size of last message sent */
        !            61:        char    acc_flush;              /* flush remainder of message */
        !            62: } acc_softc[NACC];
        !            63: 
        !            64: /*
        !            65:  * Reset the IMP and cause a transmitter interrupt by
        !            66:  * performing a null DMA.
        !            67:  */
        !            68: accprobe(reg)
        !            69:        caddr_t reg;
        !            70: {
        !            71:        register int br, cvec;          /* r11, r10 value-result */
        !            72:        register struct accdevice *addr = (struct accdevice *)reg;
        !            73: 
        !            74: #ifdef lint
        !            75:        br = 0; cvec = br; br = cvec;
        !            76:        accrint(0); accxint(0);
        !            77: #endif
        !            78:        addr->icsr = ACC_RESET; DELAY(5000);
        !            79:        addr->ocsr = ACC_RESET; DELAY(5000);
        !            80:        addr->ocsr = OUT_BBACK; DELAY(5000);
        !            81:        addr->owc = 0;
        !            82:        addr->ocsr = ACC_IE | ACC_GO; DELAY(5000);
        !            83:        addr->ocsr = 0;
        !            84:        if (cvec && cvec != 0x200)      /* transmit -> receive */
        !            85:                cvec -= 4;
        !            86:        return (1);
        !            87: }
        !            88: 
        !            89: /*
        !            90:  * Call the IMP module to allow it to set up its internal
        !            91:  * state, then tie the two modules together by setting up
        !            92:  * the back pointers to common data structures.
        !            93:  */
        !            94: accattach(ui)
        !            95:        struct uba_device *ui;
        !            96: {
        !            97:        register struct acc_softc *sc = &acc_softc[ui->ui_unit];
        !            98:        register struct impcb *ip;
        !            99:        struct ifimpcb {
        !           100:                struct  ifnet ifimp_if;
        !           101:                struct  impcb ifimp_impcb;
        !           102:        } *ifimp;
        !           103: 
        !           104:        if ((ifimp = (struct ifimpcb *)impattach(ui, accreset)) == 0)
        !           105:                panic("accattach");
        !           106:        sc->acc_if = &ifimp->ifimp_if;
        !           107:        ip = &ifimp->ifimp_impcb;
        !           108:        sc->acc_ic = ip;
        !           109:        ip->ic_init = accinit;
        !           110:        ip->ic_start = accstart;
        !           111:        sc->acc_ifuba.ifu_flags = UBA_CANTWAIT;
        !           112: #ifdef notdef
        !           113:        sc->acc_ifuba.ifu_flags |= UBA_NEEDBDP;
        !           114: #endif
        !           115: }
        !           116: 
        !           117: /*
        !           118:  * Reset interface after UNIBUS reset.
        !           119:  * If interface is on specified uba, reset its state.
        !           120:  */
        !           121: accreset(unit, uban)
        !           122:        int unit, uban;
        !           123: {
        !           124:        register struct uba_device *ui;
        !           125:        struct acc_softc *sc;
        !           126: 
        !           127:        if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           128:            ui->ui_ubanum != uban)
        !           129:                return;
        !           130:        printf(" acc%d", unit);
        !           131:        sc = &acc_softc[unit];
        !           132:        /* must go through IMP to allow it to set state */
        !           133:        (*sc->acc_if->if_init)(unit);
        !           134: }
        !           135: 
        !           136: /*
        !           137:  * Initialize interface: clear recorded pending operations,
        !           138:  * and retrieve, and initialize UNIBUS resources.  Note
        !           139:  * return value is used by IMP init routine to mark IMP
        !           140:  * unavailable for outgoing traffic.
        !           141:  */
        !           142: accinit(unit)
        !           143:        int unit;
        !           144: {      
        !           145:        register struct acc_softc *sc;
        !           146:        register struct uba_device *ui;
        !           147:        register struct accdevice *addr;
        !           148:        int info;
        !           149: 
        !           150:        if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) {
        !           151:                printf("acc%d: not alive\n", unit);
        !           152:                return (0);
        !           153:        }
        !           154:        sc = &acc_softc[unit];
        !           155:        /*
        !           156:         * Header length is 0 since we have to passs
        !           157:         * the IMP leader up to the protocol interpretation
        !           158:         * routines.  If we had the header length as
        !           159:         * sizeof(struct imp_leader), then the if_ routines
        !           160:         * would asssume we handle it on input and output.
        !           161:         */
        !           162:        if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0,
        !           163:             (int)btoc(IMPMTU)) == 0) {
        !           164:                printf("acc%d: can't initialize\n", unit);
        !           165:                ui->ui_alive = 0;
        !           166:                return (0);
        !           167:        }
        !           168:        addr = (struct accdevice *)ui->ui_addr;
        !           169: 
        !           170:        /*
        !           171:         * Reset the imp interface;
        !           172:         * the delays are pure guesswork.
        !           173:         */
        !           174:         addr->ocsr = ACC_RESET; DELAY(5000);
        !           175:        addr->ocsr = OUT_BBACK; DELAY(5000);    /* reset host master ready */
        !           176:        addr->ocsr = 0;
        !           177:        if (accinputreset(addr, unit) == 0) {
        !           178:                ui->ui_alive = 0;
        !           179:                return (0);
        !           180:        }
        !           181: 
        !           182:        /*
        !           183:         * Put up a read.  We can't restart any outstanding writes
        !           184:         * until we're back in synch with the IMP (i.e. we've flushed
        !           185:         * the NOOPs it throws at us).
        !           186:         * Note: IMPMTU includes the leader.
        !           187:         */
        !           188:        info = sc->acc_ifuba.ifu_r.ifrw_info;
        !           189:        addr->iba = (u_short)info;
        !           190:        addr->iwc = -(IMPMTU >> 1);
        !           191: #ifdef LOOPBACK
        !           192:        addr->ocsr |= OUT_BBACK;
        !           193: #endif
        !           194:        addr->icsr = 
        !           195:                IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
        !           196:        return (1);
        !           197: }
        !           198: 
        !           199: accinputreset(addr, unit)
        !           200:        register struct accdevice *addr;
        !           201:        register int unit;
        !           202: {
        !           203:        register int i;
        !           204: 
        !           205:        addr->icsr = ACC_RESET; DELAY(5000);
        !           206:        addr->icsr = IN_MRDY | IN_WEN;          /* close the relay */
        !           207:        DELAY(10000);
        !           208:        /* YECH!!! */
        !           209:        for (i = 0; i < 500; i++) {
        !           210:                if ((addr->icsr & IN_HRDY) ||
        !           211:                    (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0)
        !           212:                        return (1);
        !           213:                addr->icsr = IN_MRDY | IN_WEN; DELAY(10000);
        !           214:                /* keep turning IN_RMR off */
        !           215:        }
        !           216:        printf("acc%d: imp doesn't respond, icsr=%b\n", unit,
        !           217:                addr->icsr, ACC_INBITS);
        !           218:        return (0);
        !           219: }
        !           220: 
        !           221: /*
        !           222:  * Start output on an interface.
        !           223:  */
        !           224: accstart(dev)
        !           225:        dev_t dev;
        !           226: {
        !           227:        int unit = ACCUNIT(dev), info;
        !           228:        register struct acc_softc *sc = &acc_softc[unit];
        !           229:        register struct accdevice *addr;
        !           230:        struct mbuf *m;
        !           231:        u_short cmd;
        !           232: 
        !           233:        if (sc->acc_ic->ic_oactive)
        !           234:                goto restart;
        !           235:        
        !           236:        /*
        !           237:         * Not already active, deqeue a request and
        !           238:         * map it onto the UNIBUS.  If no more
        !           239:         * requeusts, just return.
        !           240:         */
        !           241:        IF_DEQUEUE(&sc->acc_if->if_snd, m);
        !           242:        if (m == 0) {
        !           243:                sc->acc_ic->ic_oactive = 0;
        !           244:                return;
        !           245:        }
        !           246:        sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);
        !           247: 
        !           248: restart:
        !           249:        /*
        !           250:         * Have request mapped to UNIBUS for
        !           251:         * transmission; start the output.
        !           252:         */
        !           253:        if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
        !           254:                UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
        !           255:        addr = (struct accdevice *)accinfo[unit]->ui_addr;
        !           256:        info = sc->acc_ifuba.ifu_w.ifrw_info;
        !           257:        addr->oba = (u_short)info;
        !           258:        addr->owc = -((sc->acc_olen + 1) >> 1);
        !           259:        cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO;
        !           260: #ifdef LOOPBACK
        !           261:        cmd |= OUT_BBACK;
        !           262: #endif
        !           263:        addr->ocsr = cmd;
        !           264:        sc->acc_ic->ic_oactive = 1;
        !           265: }
        !           266: 
        !           267: /*
        !           268:  * Output interrupt handler.
        !           269:  */
        !           270: accxint(unit)
        !           271:        int unit;
        !           272: {
        !           273:        register struct acc_softc *sc = &acc_softc[unit];
        !           274:        register struct accdevice *addr;
        !           275: 
        !           276:        addr = (struct accdevice *)accinfo[unit]->ui_addr;
        !           277:        if (sc->acc_ic->ic_oactive == 0) {
        !           278:                printf("acc%d: stray xmit interrupt, csr=%b\n", unit,
        !           279:                        addr->ocsr, ACC_OUTBITS);
        !           280:                return;
        !           281:        }
        !           282:        sc->acc_if->if_opackets++;
        !           283:        sc->acc_ic->ic_oactive = 0;
        !           284:        if (addr->ocsr & ACC_ERR) {
        !           285:                printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit,
        !           286:                        addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS);
        !           287:                sc->acc_if->if_oerrors++;
        !           288:        }
        !           289:        if (sc->acc_ifuba.ifu_xtofree) {
        !           290:                m_freem(sc->acc_ifuba.ifu_xtofree);
        !           291:                sc->acc_ifuba.ifu_xtofree = 0;
        !           292:        }
        !           293:        if (sc->acc_if->if_snd.ifq_head)
        !           294:                accstart(unit);
        !           295: }
        !           296: 
        !           297: /*
        !           298:  * Input interrupt handler
        !           299:  */
        !           300: accrint(unit)
        !           301:        int unit;
        !           302: {
        !           303:        register struct acc_softc *sc = &acc_softc[unit];
        !           304:        register struct accdevice *addr;
        !           305:        struct mbuf *m;
        !           306:        int len, info;
        !           307: 
        !           308:        addr = (struct accdevice *)accinfo[unit]->ui_addr;
        !           309:        sc->acc_if->if_ipackets++;
        !           310: 
        !           311:        /*
        !           312:         * Purge BDP; flush message if error indicated.
        !           313:         */
        !           314:        if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
        !           315:                UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
        !           316:        if (addr->icsr & ACC_ERR) {
        !           317:                printf("acc%d: input error, csr=%b\n", unit,
        !           318:                    addr->icsr, ACC_INBITS);
        !           319:                sc->acc_if->if_ierrors++;
        !           320:                sc->acc_flush = 1;
        !           321:        }
        !           322: 
        !           323:        if (sc->acc_flush) {
        !           324:                if (addr->icsr & IN_EOM)
        !           325:                        sc->acc_flush = 0;
        !           326:                goto setup;
        !           327:        }
        !           328:        len = IMPMTU + (addr->iwc << 1);
        !           329:        if (len < 0 || len > IMPMTU) {
        !           330:                printf("acc%d: bad length=%d\n", len);
        !           331:                sc->acc_if->if_ierrors++;
        !           332:                goto setup;
        !           333:        }
        !           334: 
        !           335:        /*
        !           336:         * The last parameter is always 0 since using
        !           337:         * trailers on the ARPAnet is insane.
        !           338:         */
        !           339:        m = if_rubaget(&sc->acc_ifuba, len, 0);
        !           340:        if (m == 0)
        !           341:                goto setup;
        !           342:        if ((addr->icsr & IN_EOM) == 0) {
        !           343:                if (sc->acc_iq)
        !           344:                        m_cat(sc->acc_iq, m);
        !           345:                else
        !           346:                        sc->acc_iq = m;
        !           347:                goto setup;
        !           348:        }
        !           349:        if (sc->acc_iq) {
        !           350:                m_cat(sc->acc_iq, m);
        !           351:                m = sc->acc_iq;
        !           352:                sc->acc_iq = 0;
        !           353:        }
        !           354:        impinput(unit, m);
        !           355: 
        !           356: setup:
        !           357:        /*
        !           358:         * Setup for next message.
        !           359:         */
        !           360:        info = sc->acc_ifuba.ifu_r.ifrw_info;
        !           361:        addr->iba = (u_short)info;
        !           362:        addr->iwc = -(IMPMTU >> 1);
        !           363:        addr->icsr =
        !           364:                IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
        !           365: }
        !           366: #endif

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