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

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986, 1988 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  *
        !            17:  *     @(#)if_acc.c    7.5 (Berkeley) 6/29/88
        !            18:  */
        !            19: 
        !            20: #include "acc.h"
        !            21: #if NACC > 0
        !            22: 
        !            23: /*
        !            24:  * ACC LH/DH ARPAnet IMP interface driver.
        !            25:  */
        !            26: #include "../machine/pte.h"
        !            27: 
        !            28: #include "param.h"
        !            29: #include "systm.h"
        !            30: #include "mbuf.h"
        !            31: #include "buf.h"
        !            32: #include "protosw.h"
        !            33: #include "socket.h"
        !            34: #include "vmmac.h"
        !            35: 
        !            36: #include "../net/if.h"
        !            37: #include "../netimp/if_imp.h"
        !            38: 
        !            39: #include "../vax/cpu.h"
        !            40: #include "../vax/mtpr.h"
        !            41: #include "if_accreg.h"
        !            42: #include "if_uba.h"
        !            43: #include "../vaxuba/ubareg.h"
        !            44: #include "../vaxuba/ubavar.h"
        !            45: 
        !            46: int     accprobe(), accattach(), accrint(), accxint();
        !            47: struct  uba_device *accinfo[NACC];
        !            48: u_short accstd[] = { 0 };
        !            49: struct  uba_driver accdriver =
        !            50:        { accprobe, 0, accattach, 0, accstd, "acc", accinfo };
        !            51: 
        !            52: int    accinit(), accoutput(), accdown(), accreset();
        !            53: 
        !            54: /*
        !            55:  * "Lower half" of IMP interface driver.
        !            56:  *
        !            57:  * Each IMP interface is handled by a common module which handles
        !            58:  * the IMP-host protocol and a hardware driver which manages the
        !            59:  * hardware specific details of talking with the IMP.
        !            60:  *
        !            61:  * The hardware portion of the IMP driver handles DMA and related
        !            62:  * management of UNIBUS resources.  The IMP protocol module interprets
        !            63:  * contents of these messages and "controls" the actions of the
        !            64:  * hardware module during IMP resets, but not, for instance, during
        !            65:  * UNIBUS resets.
        !            66:  *
        !            67:  * The two modules are coupled at "attach time", and ever after,
        !            68:  * through the imp interface structure.  Higher level protocols,
        !            69:  * e.g. IP, interact with the IMP driver, rather than the ACC.
        !            70:  */
        !            71: struct acc_softc {
        !            72:        struct  imp_softc *acc_imp;     /* data structure shared with IMP */
        !            73:        struct  ifuba acc_ifuba;        /* UNIBUS resources */
        !            74:        struct  mbuf *acc_iq;           /* input reassembly queue */
        !            75:        short   acc_olen;               /* size of last message sent */
        !            76:        char    acc_flush;              /* flush remainder of message */
        !            77: } acc_softc[NACC];
        !            78: 
        !            79: /*
        !            80:  * Reset the IMP and cause a transmitter interrupt by
        !            81:  * performing a null DMA.
        !            82:  */
        !            83: accprobe(reg)
        !            84:        caddr_t reg;
        !            85: {
        !            86:        register int br, cvec;          /* r11, r10 value-result */
        !            87:        register struct accdevice *addr = (struct accdevice *)reg;
        !            88: 
        !            89: #ifdef lint
        !            90:        br = 0; cvec = br; br = cvec;
        !            91:        accrint(0); accxint(0);
        !            92: #endif
        !            93:        addr->icsr = ACC_RESET; DELAY(5000);
        !            94:        addr->ocsr = ACC_RESET; DELAY(5000);
        !            95:        addr->ocsr = OUT_BBACK; DELAY(5000);
        !            96:        addr->owc = 0;
        !            97:        addr->ocsr = ACC_IE | ACC_GO; DELAY(5000);
        !            98:        addr->ocsr = 0;
        !            99:        if (cvec && cvec != 0x200)      /* transmit -> receive */
        !           100:                cvec -= 4;
        !           101:        return (1);
        !           102: }
        !           103: 
        !           104: /*
        !           105:  * Call the IMP module to allow it to set up its internal
        !           106:  * state, then tie the two modules together by setting up
        !           107:  * the back pointers to common data structures.
        !           108:  */
        !           109: accattach(ui)
        !           110:        register struct uba_device *ui;
        !           111: {
        !           112:        register struct acc_softc *sc = &acc_softc[ui->ui_unit];
        !           113:        register struct impcb *ip;
        !           114: 
        !           115:        if ((sc->acc_imp = impattach(ui->ui_driver->ud_dname, ui->ui_unit,
        !           116:            accreset)) == 0)
        !           117:                return;
        !           118:        ip = &sc->acc_imp->imp_cb;
        !           119:        ip->ic_init = accinit;
        !           120:        ip->ic_output = accoutput;
        !           121:        ip->ic_down = accdown;
        !           122:        sc->acc_ifuba.ifu_flags = UBA_CANTWAIT;
        !           123: #ifdef notdef
        !           124:        sc->acc_ifuba.ifu_flags |= UBA_NEEDBDP;
        !           125: #endif
        !           126: }
        !           127: 
        !           128: /*
        !           129:  * Reset interface after UNIBUS reset.
        !           130:  * If interface is on specified uba, reset its state.
        !           131:  */
        !           132: accreset(unit, uban)
        !           133:        int unit, uban;
        !           134: {
        !           135:        register struct uba_device *ui;
        !           136:        struct acc_softc *sc;
        !           137: 
        !           138:        if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           139:            ui->ui_ubanum != uban)
        !           140:                return;
        !           141:        printf(" acc%d", unit);
        !           142:        sc = &acc_softc[unit];
        !           143:        sc->acc_imp->imp_if.if_flags &= ~IFF_RUNNING;
        !           144:        accoflush(unit);
        !           145:        /* must go through IMP to allow it to set state */
        !           146:        (*sc->acc_imp->imp_if.if_init)(sc->acc_imp->imp_if.if_unit);
        !           147: }
        !           148: 
        !           149: /*
        !           150:  * Initialize interface: clear recorded pending operations,
        !           151:  * and retrieve, and initialize UNIBUS resources.  Note
        !           152:  * return value is used by IMP init routine to mark IMP
        !           153:  * unavailable for outgoing traffic.
        !           154:  */
        !           155: accinit(unit)
        !           156:        int unit;
        !           157: {      
        !           158:        register struct acc_softc *sc;
        !           159:        register struct uba_device *ui;
        !           160:        register struct accdevice *addr;
        !           161:        int info;
        !           162: 
        !           163:        if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) {
        !           164:                printf("acc%d: not alive\n", unit);
        !           165:                return (0);
        !           166:        }
        !           167:        sc = &acc_softc[unit];
        !           168:        /*
        !           169:         * Header length is 0 since we have to passs
        !           170:         * the IMP leader up to the protocol interpretation
        !           171:         * routines.  If we had the header length as
        !           172:         * sizeof(struct imp_leader), then the if_ routines
        !           173:         * would asssume we handle it on input and output.
        !           174:         */
        !           175:        if ((sc->acc_imp->imp_if.if_flags & IFF_RUNNING) == 0 &&
        !           176:            if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0,
        !           177:             (int)btoc(IMP_RCVBUF)) == 0) {
        !           178:                printf("acc%d: can't initialize\n", unit);
        !           179:                sc->acc_imp->imp_if.if_flags &= ~(IFF_UP | IFF_RUNNING);
        !           180:                return (0);
        !           181:        }
        !           182:        sc->acc_imp->imp_if.if_flags |= IFF_RUNNING;
        !           183:        addr = (struct accdevice *)ui->ui_addr;
        !           184: 
        !           185:        /*
        !           186:         * Reset the imp interface;
        !           187:         * the delays are pure guesswork.
        !           188:         */
        !           189:         addr->ocsr = ACC_RESET; DELAY(5000);
        !           190:        addr->ocsr = OUT_BBACK; DELAY(5000);    /* reset host master ready */
        !           191:        addr->ocsr = 0;
        !           192:        if (accinputreset(addr, unit) == 0) {
        !           193:                ui->ui_alive = 0;
        !           194:                return (0);
        !           195:        }
        !           196: 
        !           197:        /*
        !           198:         * Put up a read.  We can't restart any outstanding writes
        !           199:         * until we're back in synch with the IMP (i.e. we've flushed
        !           200:         * the NOOPs it throws at us).
        !           201:         * Note: IMP_RCVBUF includes the leader.
        !           202:         */
        !           203:        info = sc->acc_ifuba.ifu_r.ifrw_info;
        !           204:        addr->iba = (u_short)info;
        !           205:        addr->iwc = -((IMP_RCVBUF) >> 1);
        !           206: #ifdef LOOPBACK
        !           207:        addr->ocsr |= OUT_BBACK;
        !           208: #endif
        !           209:        addr->icsr = 
        !           210:                IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
        !           211:        return (1);
        !           212: }
        !           213: 
        !           214: accinputreset(addr, unit)
        !           215:        register struct accdevice *addr;
        !           216:        register int unit;
        !           217: {
        !           218:        register int i;
        !           219: 
        !           220:        addr->icsr = ACC_RESET; DELAY(5000);
        !           221:        addr->icsr = IN_MRDY | IN_WEN;          /* close the relay */
        !           222:        DELAY(10000);
        !           223:        /* YECH!!! */
        !           224:        for (i = 0; i < 500; i++) {
        !           225:                if ((addr->icsr & IN_HRDY) ||
        !           226:                    (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0)
        !           227:                        return (1);
        !           228:                addr->icsr = IN_MRDY | IN_WEN; DELAY(10000);
        !           229:                /* keep turning IN_RMR off */
        !           230:        }
        !           231:        printf("acc%d: imp doesn't respond, icsr=%b\n", unit,
        !           232:                addr->icsr, ACC_INBITS);
        !           233:        return (0);
        !           234: }
        !           235: 
        !           236: /*
        !           237:  * Drop the host ready line to mark host down.
        !           238:  */
        !           239: accdown(unit)
        !           240:        int unit;
        !           241: {
        !           242:        register struct accdevice *addr;
        !           243: 
        !           244:        addr = (struct accdevice *)(accinfo[unit]->ui_addr);
        !           245:         addr->ocsr = ACC_RESET;
        !           246:        DELAY(5000);
        !           247:        addr->ocsr = OUT_BBACK;         /* reset host master ready */
        !           248:        accoflush(unit);
        !           249:        return (1);
        !           250: }
        !           251: 
        !           252: accoflush(unit)
        !           253:        int unit;
        !           254: {
        !           255:        register struct acc_softc *sc = &acc_softc[unit];
        !           256: 
        !           257:        sc->acc_imp->imp_cb.ic_oactive = 0;
        !           258:        if (sc->acc_ifuba.ifu_xtofree) {
        !           259:                m_freem(sc->acc_ifuba.ifu_xtofree);
        !           260:                sc->acc_ifuba.ifu_xtofree = 0;
        !           261:        }
        !           262: }
        !           263: 
        !           264: /*
        !           265:  * Start output on an interface.
        !           266:  */
        !           267: accoutput(unit, m)
        !           268:        int unit;
        !           269:        struct mbuf *m;
        !           270: {
        !           271:        int info;
        !           272:        register struct acc_softc *sc = &acc_softc[unit];
        !           273:        register struct accdevice *addr;
        !           274:        u_short cmd;
        !           275: 
        !           276:        sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);
        !           277:        /*
        !           278:         * Have request mapped to UNIBUS for
        !           279:         * transmission; start the output.
        !           280:         */
        !           281:        if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
        !           282:                UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
        !           283:        addr = (struct accdevice *)accinfo[unit]->ui_addr;
        !           284:        info = sc->acc_ifuba.ifu_w.ifrw_info;
        !           285:        addr->oba = (u_short)info;
        !           286:        addr->owc = -((sc->acc_olen + 1) >> 1);
        !           287:        cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO;
        !           288: #ifdef LOOPBACK
        !           289:        cmd |= OUT_BBACK;
        !           290: #endif
        !           291:        addr->ocsr = cmd;
        !           292:        sc->acc_imp->imp_cb.ic_oactive = 1;
        !           293: }
        !           294: 
        !           295: /*
        !           296:  * Output interrupt handler.
        !           297:  */
        !           298: accxint(unit)
        !           299:        int unit;
        !           300: {
        !           301:        register struct acc_softc *sc = &acc_softc[unit];
        !           302:        register struct accdevice *addr;
        !           303: 
        !           304:        addr = (struct accdevice *)accinfo[unit]->ui_addr;
        !           305:        if (sc->acc_imp->imp_cb.ic_oactive == 0) {
        !           306:                printf("acc%d: stray xmit interrupt, csr=%b\n", unit,
        !           307:                        addr->ocsr, ACC_OUTBITS);
        !           308:                return;
        !           309:        }
        !           310:        sc->acc_imp->imp_if.if_opackets++;
        !           311:        sc->acc_imp->imp_cb.ic_oactive = 0;
        !           312:        if (addr->ocsr & ACC_ERR) {
        !           313:                printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit,
        !           314:                        addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS);
        !           315:                sc->acc_imp->imp_if.if_oerrors++;
        !           316:        }
        !           317:        if (sc->acc_ifuba.ifu_xtofree) {
        !           318:                m_freem(sc->acc_ifuba.ifu_xtofree);
        !           319:                sc->acc_ifuba.ifu_xtofree = 0;
        !           320:        }
        !           321:        impstart(sc->acc_imp);
        !           322: }
        !           323: 
        !           324: /*
        !           325:  * Input interrupt handler
        !           326:  */
        !           327: accrint(unit)
        !           328:        int unit;
        !           329: {
        !           330:        register struct acc_softc *sc = &acc_softc[unit];
        !           331:        register struct accdevice *addr;
        !           332:        struct mbuf *m;
        !           333:        int len, info;
        !           334: 
        !           335:        addr = (struct accdevice *)accinfo[unit]->ui_addr;
        !           336:        sc->acc_imp->imp_if.if_ipackets++;
        !           337: 
        !           338:        /*
        !           339:         * Purge BDP; flush message if error indicated.
        !           340:         */
        !           341:        if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
        !           342:                UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
        !           343:        if (addr->icsr & ACC_ERR) {
        !           344:                printf("acc%d: input error, csr=%b\n", unit,
        !           345:                    addr->icsr, ACC_INBITS);
        !           346:                sc->acc_imp->imp_if.if_ierrors++;
        !           347:                sc->acc_flush = 1;
        !           348:        }
        !           349: 
        !           350:        if (sc->acc_flush) {
        !           351:                if (addr->icsr & IN_EOM)
        !           352:                        sc->acc_flush = 0;
        !           353:                goto setup;
        !           354:        }
        !           355:        len = IMP_RCVBUF + (addr->iwc << 1);
        !           356:        if (len < 0 || len > IMP_RCVBUF) {
        !           357:                printf("acc%d: bad length=%d\n", unit, len);
        !           358:                sc->acc_imp->imp_if.if_ierrors++;
        !           359:                goto setup;
        !           360:        }
        !           361: 
        !           362:        /*
        !           363:         * The offset parameter is always 0 since using
        !           364:         * trailers on the ARPAnet is insane.
        !           365:         */
        !           366:        m = if_rubaget(&sc->acc_ifuba, len, 0, &sc->acc_imp->imp_if);
        !           367:        if (m == 0)
        !           368:                goto setup;
        !           369:        if ((addr->icsr & IN_EOM) == 0) {
        !           370:                if (sc->acc_iq)
        !           371:                        m_cat(sc->acc_iq, m);
        !           372:                else
        !           373:                        sc->acc_iq = m;
        !           374:                goto setup;
        !           375:        }
        !           376:        if (sc->acc_iq) {
        !           377:                m_cat(sc->acc_iq, m);
        !           378:                m = sc->acc_iq;
        !           379:                sc->acc_iq = 0;
        !           380:        }
        !           381:        impinput(unit, m);
        !           382: 
        !           383: setup:
        !           384:        /*
        !           385:         * Setup for next message.
        !           386:         */
        !           387:        info = sc->acc_ifuba.ifu_r.ifrw_info;
        !           388:        addr->iba = (u_short)info;
        !           389:        addr->iwc = -((IMP_RCVBUF)>> 1);
        !           390:        addr->icsr =
        !           391:                IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
        !           392: }
        !           393: #endif

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