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Annotation of 43BSDReno/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 is only permitted until one year after the first shipment
        !             6:  * of 4.4BSD by the Regents.  Otherwise, redistribution and use in source and
        !             7:  * binary forms are permitted provided that: (1) source distributions retain
        !             8:  * this entire copyright notice and comment, and (2) distributions including
        !             9:  * binaries display the following acknowledgement:  This product includes
        !            10:  * software developed by the University of California, Berkeley and its
        !            11:  * contributors'' in the documentation or other materials provided with the
        !            12:  * distribution and in all advertising materials mentioning features or use
        !            13:  * of this software.  Neither the name of the University nor the names of
        !            14:  * its contributors may be used to endorse or promote products derived from
        !            15:  * this software without specific prior written permission.
        !            16:  * THIS SOFTWARE IS PROVIDED AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            17:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            18:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            19:  *
        !            20:  *     @(#)if_acc.c    7.7 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: #include "acc.h"
        !            24: #if NACC > 0
        !            25: 
        !            26: /*
        !            27:  * ACC LH/DH ARPAnet IMP interface driver.
        !            28:  */
        !            29: #include "machine/pte.h"
        !            30: 
        !            31: #include "param.h"
        !            32: #include "systm.h"
        !            33: #include "mbuf.h"
        !            34: #include "buf.h"
        !            35: #include "protosw.h"
        !            36: #include "socket.h"
        !            37: #include "vmmac.h"
        !            38: 
        !            39: #include "../net/if.h"
        !            40: #include "../netimp/if_imp.h"
        !            41: 
        !            42: #include "../vax/cpu.h"
        !            43: #include "../vax/mtpr.h"
        !            44: #include "if_accreg.h"
        !            45: #include "if_uba.h"
        !            46: #include "../vaxuba/ubareg.h"
        !            47: #include "../vaxuba/ubavar.h"
        !            48: 
        !            49: int     accprobe(), accattach(), accrint(), accxint();
        !            50: struct  uba_device *accinfo[NACC];
        !            51: u_short accstd[] = { 0 };
        !            52: struct  uba_driver accdriver =
        !            53:        { accprobe, 0, accattach, 0, accstd, "acc", accinfo };
        !            54: 
        !            55: int    accinit(), accoutput(), accdown(), accreset();
        !            56: 
        !            57: /*
        !            58:  * "Lower half" of IMP interface driver.
        !            59:  *
        !            60:  * Each IMP interface is handled by a common module which handles
        !            61:  * the IMP-host protocol and a hardware driver which manages the
        !            62:  * hardware specific details of talking with the IMP.
        !            63:  *
        !            64:  * The hardware portion of the IMP driver handles DMA and related
        !            65:  * management of UNIBUS resources.  The IMP protocol module interprets
        !            66:  * contents of these messages and "controls" the actions of the
        !            67:  * hardware module during IMP resets, but not, for instance, during
        !            68:  * UNIBUS resets.
        !            69:  *
        !            70:  * The two modules are coupled at "attach time", and ever after,
        !            71:  * through the imp interface structure.  Higher level protocols,
        !            72:  * e.g. IP, interact with the IMP driver, rather than the ACC.
        !            73:  */
        !            74: struct acc_softc {
        !            75:        struct  imp_softc *acc_imp;     /* data structure shared with IMP */
        !            76:        struct  ifuba acc_ifuba;        /* UNIBUS resources */
        !            77:        struct  mbuf *acc_iq;           /* input reassembly queue */
        !            78:        short   acc_olen;               /* size of last message sent */
        !            79:        char    acc_flush;              /* flush remainder of message */
        !            80: } acc_softc[NACC];
        !            81: 
        !            82: /*
        !            83:  * Reset the IMP and cause a transmitter interrupt by
        !            84:  * performing a null DMA.
        !            85:  */
        !            86: accprobe(reg)
        !            87:        caddr_t reg;
        !            88: {
        !            89:        register int br, cvec;          /* r11, r10 value-result */
        !            90:        register struct accdevice *addr = (struct accdevice *)reg;
        !            91: 
        !            92: #ifdef lint
        !            93:        br = 0; cvec = br; br = cvec;
        !            94:        accrint(0); accxint(0);
        !            95: #endif
        !            96:        addr->icsr = ACC_RESET; DELAY(5000);
        !            97:        addr->ocsr = ACC_RESET; DELAY(5000);
        !            98:        addr->ocsr = OUT_BBACK; DELAY(5000);
        !            99:        addr->owc = 0;
        !           100:        addr->ocsr = ACC_IE | ACC_GO; DELAY(5000);
        !           101:        addr->ocsr = 0;
        !           102:        if (cvec && cvec != 0x200)      /* transmit -> receive */
        !           103:                cvec -= 4;
        !           104:        return (1);
        !           105: }
        !           106: 
        !           107: /*
        !           108:  * Call the IMP module to allow it to set up its internal
        !           109:  * state, then tie the two modules together by setting up
        !           110:  * the back pointers to common data structures.
        !           111:  */
        !           112: accattach(ui)
        !           113:        register struct uba_device *ui;
        !           114: {
        !           115:        register struct acc_softc *sc = &acc_softc[ui->ui_unit];
        !           116:        register struct impcb *ip;
        !           117: 
        !           118:        if ((sc->acc_imp = impattach(ui->ui_driver->ud_dname, ui->ui_unit,
        !           119:            accreset)) == 0)
        !           120:                return;
        !           121:        ip = &sc->acc_imp->imp_cb;
        !           122:        ip->ic_init = accinit;
        !           123:        ip->ic_output = accoutput;
        !           124:        ip->ic_down = accdown;
        !           125:        sc->acc_ifuba.ifu_flags = UBA_CANTWAIT;
        !           126: #ifdef notdef
        !           127:        sc->acc_ifuba.ifu_flags |= UBA_NEEDBDP;
        !           128: #endif
        !           129: }
        !           130: 
        !           131: /*
        !           132:  * Reset interface after UNIBUS reset.
        !           133:  * If interface is on specified uba, reset its state.
        !           134:  */
        !           135: accreset(unit, uban)
        !           136:        int unit, uban;
        !           137: {
        !           138:        register struct uba_device *ui;
        !           139:        struct acc_softc *sc;
        !           140: 
        !           141:        if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           142:            ui->ui_ubanum != uban)
        !           143:                return;
        !           144:        printf(" acc%d", unit);
        !           145:        sc = &acc_softc[unit];
        !           146:        sc->acc_imp->imp_if.if_flags &= ~IFF_RUNNING;
        !           147:        accoflush(unit);
        !           148:        /* must go through IMP to allow it to set state */
        !           149:        (*sc->acc_imp->imp_if.if_init)(sc->acc_imp->imp_if.if_unit);
        !           150: }
        !           151: 
        !           152: /*
        !           153:  * Initialize interface: clear recorded pending operations,
        !           154:  * and retrieve, and initialize UNIBUS resources.  Note
        !           155:  * return value is used by IMP init routine to mark IMP
        !           156:  * unavailable for outgoing traffic.
        !           157:  */
        !           158: accinit(unit)
        !           159:        int unit;
        !           160: {      
        !           161:        register struct acc_softc *sc;
        !           162:        register struct uba_device *ui;
        !           163:        register struct accdevice *addr;
        !           164:        int info;
        !           165: 
        !           166:        if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) {
        !           167:                printf("acc%d: not alive\n", unit);
        !           168:                return (0);
        !           169:        }
        !           170:        sc = &acc_softc[unit];
        !           171:        /*
        !           172:         * Header length is 0 since we have to passs
        !           173:         * the IMP leader up to the protocol interpretation
        !           174:         * routines.  If we had the header length as
        !           175:         * sizeof(struct imp_leader), then the if_ routines
        !           176:         * would asssume we handle it on input and output.
        !           177:         */
        !           178:        if ((sc->acc_imp->imp_if.if_flags & IFF_RUNNING) == 0 &&
        !           179:            if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0,
        !           180:             (int)btoc(IMP_RCVBUF)) == 0) {
        !           181:                printf("acc%d: can't initialize\n", unit);
        !           182:                sc->acc_imp->imp_if.if_flags &= ~(IFF_UP | IFF_RUNNING);
        !           183:                return (0);
        !           184:        }
        !           185:        sc->acc_imp->imp_if.if_flags |= IFF_RUNNING;
        !           186:        addr = (struct accdevice *)ui->ui_addr;
        !           187: 
        !           188:        /*
        !           189:         * Reset the imp interface;
        !           190:         * the delays are pure guesswork.
        !           191:         */
        !           192:         addr->ocsr = ACC_RESET; DELAY(5000);
        !           193:        addr->ocsr = OUT_BBACK; DELAY(5000);    /* reset host master ready */
        !           194:        addr->ocsr = 0;
        !           195:        if (accinputreset(addr, unit) == 0) {
        !           196:                ui->ui_alive = 0;
        !           197:                return (0);
        !           198:        }
        !           199: 
        !           200:        /*
        !           201:         * Put up a read.  We can't restart any outstanding writes
        !           202:         * until we're back in synch with the IMP (i.e. we've flushed
        !           203:         * the NOOPs it throws at us).
        !           204:         * Note: IMP_RCVBUF includes the leader.
        !           205:         */
        !           206:        info = sc->acc_ifuba.ifu_r.ifrw_info;
        !           207:        addr->iba = (u_short)info;
        !           208:        addr->iwc = -((IMP_RCVBUF) >> 1);
        !           209: #ifdef LOOPBACK
        !           210:        addr->ocsr |= OUT_BBACK;
        !           211: #endif
        !           212:        addr->icsr = 
        !           213:                IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
        !           214:        return (1);
        !           215: }
        !           216: 
        !           217: accinputreset(addr, unit)
        !           218:        register struct accdevice *addr;
        !           219:        register int unit;
        !           220: {
        !           221:        register int i;
        !           222: 
        !           223:        addr->icsr = ACC_RESET; DELAY(5000);
        !           224:        addr->icsr = IN_MRDY | IN_WEN;          /* close the relay */
        !           225:        DELAY(10000);
        !           226:        /* YECH!!! */
        !           227:        for (i = 0; i < 500; i++) {
        !           228:                if ((addr->icsr & IN_HRDY) ||
        !           229:                    (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0)
        !           230:                        return (1);
        !           231:                addr->icsr = IN_MRDY | IN_WEN; DELAY(10000);
        !           232:                /* keep turning IN_RMR off */
        !           233:        }
        !           234:        printf("acc%d: imp doesn't respond, icsr=%b\n", unit,
        !           235:                addr->icsr, ACC_INBITS);
        !           236:        return (0);
        !           237: }
        !           238: 
        !           239: /*
        !           240:  * Drop the host ready line to mark host down.
        !           241:  */
        !           242: accdown(unit)
        !           243:        int unit;
        !           244: {
        !           245:        register struct accdevice *addr;
        !           246: 
        !           247:        addr = (struct accdevice *)(accinfo[unit]->ui_addr);
        !           248:         addr->ocsr = ACC_RESET;
        !           249:        DELAY(5000);
        !           250:        addr->ocsr = OUT_BBACK;         /* reset host master ready */
        !           251:        accoflush(unit);
        !           252:        return (1);
        !           253: }
        !           254: 
        !           255: accoflush(unit)
        !           256:        int unit;
        !           257: {
        !           258:        register struct acc_softc *sc = &acc_softc[unit];
        !           259: 
        !           260:        sc->acc_imp->imp_cb.ic_oactive = 0;
        !           261:        if (sc->acc_ifuba.ifu_xtofree) {
        !           262:                m_freem(sc->acc_ifuba.ifu_xtofree);
        !           263:                sc->acc_ifuba.ifu_xtofree = 0;
        !           264:        }
        !           265: }
        !           266: 
        !           267: /*
        !           268:  * Start output on an interface.
        !           269:  */
        !           270: accoutput(unit, m)
        !           271:        int unit;
        !           272:        struct mbuf *m;
        !           273: {
        !           274:        int info;
        !           275:        register struct acc_softc *sc = &acc_softc[unit];
        !           276:        register struct accdevice *addr;
        !           277:        u_short cmd;
        !           278: 
        !           279:        sc->acc_olen = if_wubaput(&sc->acc_ifuba, m);
        !           280:        /*
        !           281:         * Have request mapped to UNIBUS for
        !           282:         * transmission; start the output.
        !           283:         */
        !           284:        if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
        !           285:                UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp);
        !           286:        addr = (struct accdevice *)accinfo[unit]->ui_addr;
        !           287:        info = sc->acc_ifuba.ifu_w.ifrw_info;
        !           288:        addr->oba = (u_short)info;
        !           289:        addr->owc = -((sc->acc_olen + 1) >> 1);
        !           290:        cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO;
        !           291: #ifdef LOOPBACK
        !           292:        cmd |= OUT_BBACK;
        !           293: #endif
        !           294:        addr->ocsr = cmd;
        !           295:        sc->acc_imp->imp_cb.ic_oactive = 1;
        !           296: }
        !           297: 
        !           298: /*
        !           299:  * Output interrupt handler.
        !           300:  */
        !           301: accxint(unit)
        !           302:        int unit;
        !           303: {
        !           304:        register struct acc_softc *sc = &acc_softc[unit];
        !           305:        register struct accdevice *addr;
        !           306: 
        !           307:        addr = (struct accdevice *)accinfo[unit]->ui_addr;
        !           308:        if (sc->acc_imp->imp_cb.ic_oactive == 0) {
        !           309:                printf("acc%d: stray xmit interrupt, csr=%b\n", unit,
        !           310:                        addr->ocsr, ACC_OUTBITS);
        !           311:                return;
        !           312:        }
        !           313:        sc->acc_imp->imp_if.if_opackets++;
        !           314:        sc->acc_imp->imp_cb.ic_oactive = 0;
        !           315:        if (addr->ocsr & ACC_ERR) {
        !           316:                printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit,
        !           317:                        addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS);
        !           318:                sc->acc_imp->imp_if.if_oerrors++;
        !           319:        }
        !           320:        if (sc->acc_ifuba.ifu_xtofree) {
        !           321:                m_freem(sc->acc_ifuba.ifu_xtofree);
        !           322:                sc->acc_ifuba.ifu_xtofree = 0;
        !           323:        }
        !           324:        impstart(sc->acc_imp);
        !           325: }
        !           326: 
        !           327: /*
        !           328:  * Input interrupt handler
        !           329:  */
        !           330: accrint(unit)
        !           331:        int unit;
        !           332: {
        !           333:        register struct acc_softc *sc = &acc_softc[unit];
        !           334:        register struct accdevice *addr;
        !           335:        struct mbuf *m;
        !           336:        int len, info;
        !           337: 
        !           338:        addr = (struct accdevice *)accinfo[unit]->ui_addr;
        !           339:        sc->acc_imp->imp_if.if_ipackets++;
        !           340: 
        !           341:        /*
        !           342:         * Purge BDP; flush message if error indicated.
        !           343:         */
        !           344:        if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP)
        !           345:                UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp);
        !           346:        if (addr->icsr & ACC_ERR) {
        !           347:                printf("acc%d: input error, csr=%b\n", unit,
        !           348:                    addr->icsr, ACC_INBITS);
        !           349:                sc->acc_imp->imp_if.if_ierrors++;
        !           350:                sc->acc_flush = 1;
        !           351:        }
        !           352: 
        !           353:        if (sc->acc_flush) {
        !           354:                if (addr->icsr & IN_EOM)
        !           355:                        sc->acc_flush = 0;
        !           356:                goto setup;
        !           357:        }
        !           358:        len = IMP_RCVBUF + (addr->iwc << 1);
        !           359:        if (len < 0 || len > IMP_RCVBUF) {
        !           360:                printf("acc%d: bad length=%d\n", unit, len);
        !           361:                sc->acc_imp->imp_if.if_ierrors++;
        !           362:                goto setup;
        !           363:        }
        !           364: 
        !           365:        /*
        !           366:         * The offset parameter is always 0 since using
        !           367:         * trailers on the ARPAnet is insane.
        !           368:         */
        !           369:        m = if_rubaget(&sc->acc_ifuba, len, 0, &sc->acc_imp->imp_if);
        !           370:        if (m == 0)
        !           371:                goto setup;
        !           372:        if ((addr->icsr & IN_EOM) == 0) {
        !           373:                if (sc->acc_iq)
        !           374:                        m_cat(sc->acc_iq, m);
        !           375:                else
        !           376:                        sc->acc_iq = m;
        !           377:                goto setup;
        !           378:        }
        !           379:        if (sc->acc_iq) {
        !           380:                m_cat(sc->acc_iq, m);
        !           381:                m = sc->acc_iq;
        !           382:                sc->acc_iq = 0;
        !           383:        }
        !           384:        impinput(unit, m);
        !           385: 
        !           386: setup:
        !           387:        /*
        !           388:         * Setup for next message.
        !           389:         */
        !           390:        info = sc->acc_ifuba.ifu_r.ifrw_info;
        !           391:        addr->iba = (u_short)info;
        !           392:        addr->iwc = -((IMP_RCVBUF)>> 1);
        !           393:        addr->icsr =
        !           394:                IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO;
        !           395: }
        !           396: #endif

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