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Annotation of 43BSDReno/sys/vaxif/if_css.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_css.c    7.8 (Berkeley) 6/28/90
        !            21:  */
        !            22: 
        !            23: #include "css.h"
        !            24: #if NCSS > 0
        !            25: 
        !            26: /*
        !            27:  * DEC/CSS IMP11-A ARPAnet IMP interface driver.
        !            28:  * Since "imp11a" is such a mouthful, it is called
        !            29:  * "css" after the LH/DH being called "acc".
        !            30:  *
        !            31:  * Configuration notes:
        !            32:  *
        !            33:  * As delivered from DEC/CSS, it
        !            34:  * is addressed and vectored as two DR11-B's.  This makes
        !            35:  * Autoconfig almost IMPOSSIBLE.  To make it work, the
        !            36:  * interrupt vectors must be restrapped to make the vectors
        !            37:  * consecutive.  The 020 hole between the CSR addresses is
        !            38:  * tolerated, althought that could be cleaned-up also.
        !            39:  *
        !            40:  * Additionally, the TRANSMIT side of the IMP11-A has the
        !            41:  * lower address of the two subunits, so the vector ordering
        !            42:  * in the CONFIG file is reversed from most other devices.
        !            43:  * It should be:
        !            44:  *
        !            45:  * device css0 ....  cssxint cssrint
        !            46:  *
        !            47:  * If you get it wrong, it will still autoconfig, but will just
        !            48:  * sit there with RECEIVE IDLE indicated on the front panel.
        !            49:  */
        !            50: #include "param.h"
        !            51: #include "systm.h"
        !            52: #include "mbuf.h"
        !            53: #include "buf.h"
        !            54: #include "protosw.h"
        !            55: #include "socket.h"
        !            56: #include "vmmac.h"
        !            57: 
        !            58: #include "machine/pte.h"
        !            59: 
        !            60: #include "../net/if.h"
        !            61: #include "../netimp/if_imp.h"
        !            62: 
        !            63: #include "../vax/cpu.h"
        !            64: #include "../vax/mtpr.h"
        !            65: #include "if_cssreg.h"
        !            66: #include "if_uba.h"
        !            67: #include "../vaxuba/ubareg.h"
        !            68: #include "../vaxuba/ubavar.h"
        !            69: 
        !            70: int     cssprobe(), cssattach(), cssrint(), cssxint();
        !            71: struct  uba_device *cssinfo[NCSS];
        !            72: u_short cssstd[] = { 0 };
        !            73: struct  uba_driver cssdriver =
        !            74:         { cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo };
        !            75: 
        !            76: int     cssinit(), cssoutput(), cssdown(), cssreset();
        !            77: 
        !            78: /*
        !            79:  * "Lower half" of IMP interface driver.
        !            80:  *
        !            81:  * Each IMP interface is handled by a common module which handles
        !            82:  * the IMP-host protocol and a hardware driver which manages the
        !            83:  * hardware specific details of talking with the IMP.
        !            84:  *
        !            85:  * The hardware portion of the IMP driver handles DMA and related
        !            86:  * management of UNIBUS resources.  The IMP protocol module interprets
        !            87:  * contents of these messages and "controls" the actions of the
        !            88:  * hardware module during IMP resets, but not, for instance, during
        !            89:  * UNIBUS resets.
        !            90:  *
        !            91:  * The two modules are coupled at "attach time", and ever after,
        !            92:  * through the imp interface structure.  Higher level protocols,
        !            93:  * e.g. IP, interact with the IMP driver, rather than the CSS.
        !            94:  */
        !            95: struct  css_softc {
        !            96:        struct  imp_softc *css_imp;     /* pointer to IMP's imp_softc struct */
        !            97:        struct  ifuba css_ifuba;        /* UNIBUS resources */
        !            98:        struct  mbuf *css_iq;           /* input reassembly queue */
        !            99:        short   css_olen;               /* size of last message sent */
        !           100:        char    css_flush;              /* flush remainder of message */
        !           101: } css_softc[NCSS];
        !           102: 
        !           103: /*
        !           104:  * Reset the IMP and cause a transmitter interrupt by
        !           105:  * performing a null DMA.
        !           106:  */
        !           107: cssprobe(reg)
        !           108:         caddr_t reg;
        !           109: {
        !           110:         register int br, cvec;          /* r11, r10 value-result */
        !           111:         register struct cssdevice *addr = (struct cssdevice *)reg;
        !           112: 
        !           113: #ifdef lint
        !           114:         br = 0; cvec = br; br = cvec;
        !           115:         cssrint(0); cssxint(0);
        !           116: #endif
        !           117: 
        !           118:         addr->css_icsr = CSS_CLR;
        !           119:         addr->css_ocsr = CSS_CLR;
        !           120:         DELAY(50000);
        !           121:        addr->css_icsr = 0;
        !           122:        addr->css_ocsr = 0;
        !           123:         DELAY(50000);
        !           124: 
        !           125:        addr->css_oba = 0;
        !           126:        addr->css_owc = -1;
        !           127:         addr->css_ocsr = CSS_IE | CSS_GO;      /* enable interrupts */
        !           128:         DELAY(50000);
        !           129:         addr->css_ocsr = 0;
        !           130: 
        !           131:         return (1);
        !           132: }
        !           133: 
        !           134: /*
        !           135:  * Call the IMP module to allow it to set up its internal
        !           136:  * state, then tie the two modules together by setting up
        !           137:  * the back pointers to common data structures.
        !           138:  */
        !           139: cssattach(ui)
        !           140:         register struct uba_device *ui;
        !           141: {
        !           142:         register struct css_softc *sc = &css_softc[ui->ui_unit];
        !           143:         register struct impcb *ip;
        !           144: 
        !           145:         if ((sc->css_imp = impattach(ui->ui_driver->ud_dname, ui->ui_unit,
        !           146:            cssreset)) == 0)
        !           147:                 return;
        !           148:        ip = &sc->css_imp->imp_cb;
        !           149:         ip->ic_init = cssinit;
        !           150:         ip->ic_output = cssoutput;
        !           151:         ip->ic_down = cssdown;
        !           152:        sc->css_ifuba.ifu_flags = UBA_CANTWAIT | UBA_NEED16;
        !           153: #ifdef notdef
        !           154:        sc->css_ifuba.ifu_flags |= UBA_NEEDBDP;
        !           155: #endif
        !           156: }
        !           157: 
        !           158: /*
        !           159:  * Reset interface after UNIBUS reset.
        !           160:  * If interface is on specified uba, reset its state.
        !           161:  */
        !           162: cssreset(unit, uban)
        !           163:         int unit, uban;
        !           164: {
        !           165:         register struct uba_device *ui;
        !           166:         register struct css_softc *sc;
        !           167: 
        !           168:         if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           169:             ui->ui_ubanum != uban)
        !           170:                 return;
        !           171:         printf(" css%d", unit);
        !           172:         sc = &css_softc[unit];
        !           173:        sc->css_imp->imp_if.if_flags &= ~IFF_RUNNING;
        !           174:        cssoflush(unit);
        !           175:         /* must go through IMP to allow it to set state */
        !           176:         (*sc->css_imp->imp_if.if_init)(sc->css_imp->imp_if.if_unit);
        !           177: }
        !           178: 
        !           179: /*
        !           180:  * Initialize interface: clear recorded pending operations,
        !           181:  * and retrieve, and reinitialize UNIBUS resources.
        !           182:  */
        !           183: cssinit(unit)
        !           184:         int unit;
        !           185: {       
        !           186:         register struct css_softc *sc;
        !           187:         register struct uba_device *ui;
        !           188:         register struct cssdevice *addr;
        !           189:         int x, info;
        !           190: 
        !           191:        if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0) {
        !           192:                printf("css%d: not alive\n", unit);
        !           193:                return(0);
        !           194:        }
        !           195:        sc = &css_softc[unit];
        !           196: 
        !           197:        /*
        !           198:         * Header length is 0 to if_ubainit since we have to pass
        !           199:         * the IMP leader up to the protocol interpretaion
        !           200:         * routines.  If we had the deader length as
        !           201:         * sizeof(struct imp_leader), then the if_ routines
        !           202:         * would assume we handle it on input and output.
        !           203:         */
        !           204:        
        !           205:         if ((sc->css_imp->imp_if.if_flags & IFF_RUNNING) == 0 &&
        !           206:            if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,
        !           207:            (int)btoc(IMP_RCVBUF)) == 0) {
        !           208:                 printf("css%d: can't initialize\n", unit);
        !           209:                ui->ui_alive = 0;
        !           210:                sc->css_imp->imp_if.if_flags &= ~(IFF_UP | IFF_RUNNING);
        !           211:                return(0);
        !           212:         }
        !           213:        sc->css_imp->imp_if.if_flags |= IFF_RUNNING;
        !           214:         addr = (struct cssdevice *)ui->ui_addr;
        !           215: 
        !           216:         /* reset the imp interface. */
        !           217:         x = spl5();
        !           218:         addr->css_icsr = CSS_CLR;
        !           219:         addr->css_ocsr = CSS_CLR;
        !           220:        DELAY(100);
        !           221:        addr->css_icsr = 0;
        !           222:        addr->css_ocsr = 0;
        !           223:         addr->css_icsr = IN_HRDY;       /* close the relay */
        !           224:        DELAY(5000);
        !           225:         splx(x);
        !           226: 
        !           227:         /*
        !           228:         * This may hang if the imp isn't really there.
        !           229:         * Will test and verify safe operation.
        !           230:         */
        !           231: 
        !           232:        x = 500;
        !           233:        while (x-- > 0) {
        !           234:                if ((addr->css_icsr & (IN_HRDY|IN_IMPNR)) == IN_HRDY) 
        !           235:                        break;
        !           236:                 addr->css_icsr = IN_HRDY;      /* close the relay */
        !           237:                 DELAY(5000);
        !           238:         }
        !           239: 
        !           240:        if (x <= 0) {
        !           241:                printf("css%d: imp doesn't respond, icsr=%b\n", unit,
        !           242:                        CSS_INBITS, addr->css_icsr);
        !           243:                goto down;
        !           244:        }
        !           245: 
        !           246:         /*
        !           247:          * Put up a read.  We can't restart any outstanding writes
        !           248:          * until we're back in synch with the IMP (i.e. we've flushed
        !           249:          * the NOOPs it throws at us).
        !           250:         * Note: IMP_RCVBUF includes the leader.
        !           251:          */
        !           252: 
        !           253:         x = spl5();
        !           254:         info = sc->css_ifuba.ifu_r.ifrw_info;
        !           255:         addr->css_iba = (u_short)info;
        !           256:         addr->css_iwc = -(IMP_RCVBUF >> 1);
        !           257:         addr->css_icsr = 
        !           258:                 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
        !           259:         splx(x);
        !           260:        return(1);
        !           261: 
        !           262: down:
        !           263:        ui->ui_alive = 0;
        !           264:        return(0);
        !           265: }
        !           266: 
        !           267: /*
        !           268:  * Drop the host ready line to mark host down.
        !           269:  * UNTESTED.
        !           270:  */
        !           271: cssdown(unit)
        !           272:        int unit;
        !           273: {
        !           274:         register struct cssdevice *addr;
        !           275: 
        !           276:        addr = (struct cssdevice *)(cssinfo[unit]->ui_addr);
        !           277:         /* reset the imp interface. */
        !           278:         addr->css_icsr = CSS_CLR;
        !           279:         addr->css_ocsr = CSS_CLR;
        !           280:        DELAY(100);
        !           281:        addr->css_icsr = 0;
        !           282:        addr->css_ocsr = 0;
        !           283:        cssoflush(unit);
        !           284:        return (1);
        !           285: }
        !           286: 
        !           287: cssoflush(unit)
        !           288:        int unit;
        !           289: {
        !           290:        register struct css_softc *sc = &css_softc[unit];
        !           291: 
        !           292:        sc->css_imp->imp_cb.ic_oactive = 0;
        !           293:        if (sc->css_ifuba.ifu_xtofree) {
        !           294:                m_freem(sc->css_ifuba.ifu_xtofree);
        !           295:                sc->css_ifuba.ifu_xtofree = 0;
        !           296:        }
        !           297: }
        !           298: 
        !           299: /*
        !           300:  * Start output on an interface.
        !           301:  */
        !           302: cssoutput(unit, m)
        !           303:         int unit;
        !           304:         struct mbuf *m;
        !           305: {
        !           306:         int info;
        !           307:         struct uba_device *ui = cssinfo[unit];
        !           308:         register struct css_softc *sc = &css_softc[unit];
        !           309:         register struct cssdevice *addr;
        !           310: 
        !           311:         sc->css_olen = if_wubaput(&sc->css_ifuba, m);
        !           312:         /*
        !           313:          * Have request mapped to UNIBUS for transmission.
        !           314:          * Purge any stale data from the BDP, and start the output.
        !           315:          */
        !           316:        if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
        !           317:                UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp);
        !           318:         addr = (struct cssdevice *)ui->ui_addr;
        !           319:         info = sc->css_ifuba.ifu_w.ifrw_info;
        !           320:         addr->css_oba = (u_short)info;
        !           321:         addr->css_owc = -((sc->css_olen + 1) >> 1);
        !           322:         addr->css_ocsr =
        !           323:            (u_short)(CSS_IE | OUT_ENLB | ((info & 0x30000) >> 12) | CSS_GO);
        !           324:         sc->css_imp->imp_cb.ic_oactive = 1;
        !           325: }
        !           326: 
        !           327: /*
        !           328:  * Output interrupt handler.
        !           329:  */
        !           330: cssxint(unit)
        !           331: {
        !           332:         register struct uba_device *ui = cssinfo[unit];
        !           333:         register struct css_softc *sc = &css_softc[unit];
        !           334:         register struct cssdevice *addr;
        !           335: 
        !           336:         addr = (struct cssdevice *)ui->ui_addr;
        !           337:         if (sc->css_imp->imp_cb.ic_oactive == 0) {
        !           338:                 printf("css%d: stray output interrupt csr=%b\n",
        !           339:                        unit, addr->css_ocsr, CSS_OUTBITS);
        !           340:                 return;
        !           341:         }
        !           342:         sc->css_imp->imp_if.if_opackets++;
        !           343:         sc->css_imp->imp_cb.ic_oactive = 0;
        !           344:         if (addr->css_ocsr & CSS_ERR){
        !           345:                 sc->css_imp->imp_if.if_oerrors++;
        !           346:                 printf("css%d: output error, ocsr=%b icsr=%b\n", unit,
        !           347:                         addr->css_ocsr, CSS_OUTBITS,
        !           348:                        addr->css_icsr, CSS_INBITS);
        !           349:        }
        !           350:        if (sc->css_ifuba.ifu_xtofree) {
        !           351:                m_freem(sc->css_ifuba.ifu_xtofree);
        !           352:                sc->css_ifuba.ifu_xtofree = 0;
        !           353:        }
        !           354:        impstart(sc->css_imp);
        !           355: }
        !           356: 
        !           357: /*
        !           358:  * Input interrupt handler
        !           359:  */
        !           360: cssrint(unit)
        !           361: {
        !           362:         register struct css_softc *sc = &css_softc[unit];
        !           363:         register struct cssdevice *addr;
        !           364:         struct mbuf *m;
        !           365:         int len, info;
        !           366: 
        !           367:         sc->css_imp->imp_if.if_ipackets++;
        !           368: 
        !           369:         /*
        !           370:          * Purge BDP; flush message if error indicated.
        !           371:          */
        !           372: 
        !           373:         addr = (struct cssdevice *)cssinfo[unit]->ui_addr;
        !           374:        if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
        !           375:                UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp);
        !           376:         if (addr->css_icsr & CSS_ERR) {
        !           377:                 printf("css%d: recv error, csr=%b\n", unit,
        !           378:                     addr->css_icsr, CSS_INBITS);
        !           379:                 sc->css_imp->imp_if.if_ierrors++;
        !           380:                 sc->css_flush = 1;
        !           381:         }
        !           382: 
        !           383:         if (sc->css_flush) {
        !           384:                 if (addr->css_icsr & IN_EOM)
        !           385:                         sc->css_flush = 0;
        !           386:                 goto setup;
        !           387:         }
        !           388: 
        !           389:         len = IMP_RCVBUF + (addr->css_iwc << 1);
        !           390:        if (len < 0 || len > IMP_RCVBUF) {
        !           391:                printf("css%d: bad length=%d\n", len);
        !           392:                sc->css_imp->imp_if.if_ierrors++;
        !           393:                goto setup;
        !           394:        }
        !           395: 
        !           396:         /*
        !           397:          * The offset parameter is always 0 since using
        !           398:          * trailers on the ARPAnet is insane.
        !           399:          */
        !           400:         m = if_rubaget(&sc->css_ifuba, len, 0, &sc->css_imp->imp_if);
        !           401:         if (m == 0)
        !           402:                 goto setup;
        !           403:         if ((addr->css_icsr & IN_EOM) == 0) {
        !           404:                if (sc->css_iq)
        !           405:                        m_cat(sc->css_iq, m);
        !           406:                else
        !           407:                        sc->css_iq = m;
        !           408:                goto setup;
        !           409:        }
        !           410:        if (sc->css_iq) {
        !           411:                m_cat(sc->css_iq, m);
        !           412:                m = sc->css_iq;
        !           413:                sc->css_iq = 0;
        !           414:         }
        !           415:         impinput(unit, m);
        !           416: 
        !           417: setup:
        !           418:         /*
        !           419:          * Setup for next message.
        !           420:          */
        !           421:         info = sc->css_ifuba.ifu_r.ifrw_info;
        !           422:         addr->css_iba = (u_short)info;
        !           423:         addr->css_iwc = - (IMP_RCVBUF >> 1);
        !           424:         addr->css_icsr =
        !           425:                 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
        !           426: }
        !           427: #endif

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