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Annotation of 43BSDTahoe/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 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_css.c    7.6 (Berkeley) 6/29/88
        !            18:  */
        !            19: 
        !            20: #include "css.h"
        !            21: #if NCSS > 0
        !            22: 
        !            23: /*
        !            24:  * DEC/CSS IMP11-A ARPAnet IMP interface driver.
        !            25:  * Since "imp11a" is such a mouthful, it is called
        !            26:  * "css" after the LH/DH being called "acc".
        !            27:  *
        !            28:  * Configuration notes:
        !            29:  *
        !            30:  * As delivered from DEC/CSS, it
        !            31:  * is addressed and vectored as two DR11-B's.  This makes
        !            32:  * Autoconfig almost IMPOSSIBLE.  To make it work, the
        !            33:  * interrupt vectors must be restrapped to make the vectors
        !            34:  * consecutive.  The 020 hole between the CSR addresses is
        !            35:  * tolerated, althought that could be cleaned-up also.
        !            36:  *
        !            37:  * Additionally, the TRANSMIT side of the IMP11-A has the
        !            38:  * lower address of the two subunits, so the vector ordering
        !            39:  * in the CONFIG file is reversed from most other devices.
        !            40:  * It should be:
        !            41:  *
        !            42:  * device css0 ....  cssxint cssrint
        !            43:  *
        !            44:  * If you get it wrong, it will still autoconfig, but will just
        !            45:  * sit there with RECEIVE IDLE indicated on the front panel.
        !            46:  */
        !            47: #include "param.h"
        !            48: #include "systm.h"
        !            49: #include "mbuf.h"
        !            50: #include "buf.h"
        !            51: #include "protosw.h"
        !            52: #include "socket.h"
        !            53: #include "vmmac.h"
        !            54: 
        !            55: #include "../machine/pte.h"
        !            56: 
        !            57: #include "../net/if.h"
        !            58: #include "../netimp/if_imp.h"
        !            59: 
        !            60: #include "../vax/cpu.h"
        !            61: #include "../vax/mtpr.h"
        !            62: #include "if_cssreg.h"
        !            63: #include "if_uba.h"
        !            64: #include "../vaxuba/ubareg.h"
        !            65: #include "../vaxuba/ubavar.h"
        !            66: 
        !            67: int     cssprobe(), cssattach(), cssrint(), cssxint();
        !            68: struct  uba_device *cssinfo[NCSS];
        !            69: u_short cssstd[] = { 0 };
        !            70: struct  uba_driver cssdriver =
        !            71:         { cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo };
        !            72: 
        !            73: int     cssinit(), cssoutput(), cssdown(), cssreset();
        !            74: 
        !            75: /*
        !            76:  * "Lower half" of IMP interface driver.
        !            77:  *
        !            78:  * Each IMP interface is handled by a common module which handles
        !            79:  * the IMP-host protocol and a hardware driver which manages the
        !            80:  * hardware specific details of talking with the IMP.
        !            81:  *
        !            82:  * The hardware portion of the IMP driver handles DMA and related
        !            83:  * management of UNIBUS resources.  The IMP protocol module interprets
        !            84:  * contents of these messages and "controls" the actions of the
        !            85:  * hardware module during IMP resets, but not, for instance, during
        !            86:  * UNIBUS resets.
        !            87:  *
        !            88:  * The two modules are coupled at "attach time", and ever after,
        !            89:  * through the imp interface structure.  Higher level protocols,
        !            90:  * e.g. IP, interact with the IMP driver, rather than the CSS.
        !            91:  */
        !            92: struct  css_softc {
        !            93:        struct  imp_softc *css_imp;     /* pointer to IMP's imp_softc struct */
        !            94:        struct  ifuba css_ifuba;        /* UNIBUS resources */
        !            95:        struct  mbuf *css_iq;           /* input reassembly queue */
        !            96:        short   css_olen;               /* size of last message sent */
        !            97:        char    css_flush;              /* flush remainder of message */
        !            98: } css_softc[NCSS];
        !            99: 
        !           100: /*
        !           101:  * Reset the IMP and cause a transmitter interrupt by
        !           102:  * performing a null DMA.
        !           103:  */
        !           104: cssprobe(reg)
        !           105:         caddr_t reg;
        !           106: {
        !           107:         register int br, cvec;          /* r11, r10 value-result */
        !           108:         register struct cssdevice *addr = (struct cssdevice *)reg;
        !           109: 
        !           110: #ifdef lint
        !           111:         br = 0; cvec = br; br = cvec;
        !           112:         cssrint(0); cssxint(0);
        !           113: #endif
        !           114: 
        !           115:         addr->css_icsr = CSS_CLR;
        !           116:         addr->css_ocsr = CSS_CLR;
        !           117:         DELAY(50000);
        !           118:        addr->css_icsr = 0;
        !           119:        addr->css_ocsr = 0;
        !           120:         DELAY(50000);
        !           121: 
        !           122:        addr->css_oba = 0;
        !           123:        addr->css_owc = -1;
        !           124:         addr->css_ocsr = CSS_IE | CSS_GO;      /* enable interrupts */
        !           125:         DELAY(50000);
        !           126:         addr->css_ocsr = 0;
        !           127: 
        !           128:         return (1);
        !           129: }
        !           130: 
        !           131: /*
        !           132:  * Call the IMP module to allow it to set up its internal
        !           133:  * state, then tie the two modules together by setting up
        !           134:  * the back pointers to common data structures.
        !           135:  */
        !           136: cssattach(ui)
        !           137:         register struct uba_device *ui;
        !           138: {
        !           139:         register struct css_softc *sc = &css_softc[ui->ui_unit];
        !           140:         register struct impcb *ip;
        !           141: 
        !           142:         if ((sc->css_imp = impattach(ui->ui_driver->ud_dname, ui->ui_unit,
        !           143:            cssreset)) == 0)
        !           144:                 return;
        !           145:        ip = &sc->css_imp->imp_cb;
        !           146:         ip->ic_init = cssinit;
        !           147:         ip->ic_output = cssoutput;
        !           148:         ip->ic_down = cssdown;
        !           149:        sc->css_ifuba.ifu_flags = UBA_CANTWAIT | UBA_NEED16;
        !           150: #ifdef notdef
        !           151:        sc->css_ifuba.ifu_flags |= UBA_NEEDBDP;
        !           152: #endif
        !           153: }
        !           154: 
        !           155: /*
        !           156:  * Reset interface after UNIBUS reset.
        !           157:  * If interface is on specified uba, reset its state.
        !           158:  */
        !           159: cssreset(unit, uban)
        !           160:         int unit, uban;
        !           161: {
        !           162:         register struct uba_device *ui;
        !           163:         register struct css_softc *sc;
        !           164: 
        !           165:         if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           166:             ui->ui_ubanum != uban)
        !           167:                 return;
        !           168:         printf(" css%d", unit);
        !           169:         sc = &css_softc[unit];
        !           170:        sc->css_imp->imp_if.if_flags &= ~IFF_RUNNING;
        !           171:        cssoflush(unit);
        !           172:         /* must go through IMP to allow it to set state */
        !           173:         (*sc->css_imp->imp_if.if_init)(sc->css_imp->imp_if.if_unit);
        !           174: }
        !           175: 
        !           176: /*
        !           177:  * Initialize interface: clear recorded pending operations,
        !           178:  * and retrieve, and reinitialize UNIBUS resources.
        !           179:  */
        !           180: cssinit(unit)
        !           181:         int unit;
        !           182: {       
        !           183:         register struct css_softc *sc;
        !           184:         register struct uba_device *ui;
        !           185:         register struct cssdevice *addr;
        !           186:         int x, info;
        !           187: 
        !           188:        if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0) {
        !           189:                printf("css%d: not alive\n", unit);
        !           190:                return(0);
        !           191:        }
        !           192:        sc = &css_softc[unit];
        !           193: 
        !           194:        /*
        !           195:         * Header length is 0 to if_ubainit since we have to pass
        !           196:         * the IMP leader up to the protocol interpretaion
        !           197:         * routines.  If we had the deader length as
        !           198:         * sizeof(struct imp_leader), then the if_ routines
        !           199:         * would assume we handle it on input and output.
        !           200:         */
        !           201:        
        !           202:         if ((sc->css_imp->imp_if.if_flags & IFF_RUNNING) == 0 &&
        !           203:            if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,
        !           204:            (int)btoc(IMP_RCVBUF)) == 0) {
        !           205:                 printf("css%d: can't initialize\n", unit);
        !           206:                ui->ui_alive = 0;
        !           207:                sc->css_imp->imp_if.if_flags &= ~(IFF_UP | IFF_RUNNING);
        !           208:                return(0);
        !           209:         }
        !           210:        sc->css_imp->imp_if.if_flags |= IFF_RUNNING;
        !           211:         addr = (struct cssdevice *)ui->ui_addr;
        !           212: 
        !           213:         /* reset the imp interface. */
        !           214:         x = spl5();
        !           215:         addr->css_icsr = CSS_CLR;
        !           216:         addr->css_ocsr = CSS_CLR;
        !           217:        DELAY(100);
        !           218:        addr->css_icsr = 0;
        !           219:        addr->css_ocsr = 0;
        !           220:         addr->css_icsr = IN_HRDY;       /* close the relay */
        !           221:        DELAY(5000);
        !           222:         splx(x);
        !           223: 
        !           224:         /*
        !           225:         * This may hang if the imp isn't really there.
        !           226:         * Will test and verify safe operation.
        !           227:         */
        !           228: 
        !           229:        x = 500;
        !           230:        while (x-- > 0) {
        !           231:                if ((addr->css_icsr & (IN_HRDY|IN_IMPNR)) == IN_HRDY) 
        !           232:                        break;
        !           233:                 addr->css_icsr = IN_HRDY;      /* close the relay */
        !           234:                 DELAY(5000);
        !           235:         }
        !           236: 
        !           237:        if (x <= 0) {
        !           238:                printf("css%d: imp doesn't respond, icsr=%b\n", unit,
        !           239:                        CSS_INBITS, addr->css_icsr);
        !           240:                goto down;
        !           241:        }
        !           242: 
        !           243:         /*
        !           244:          * Put up a read.  We can't restart any outstanding writes
        !           245:          * until we're back in synch with the IMP (i.e. we've flushed
        !           246:          * the NOOPs it throws at us).
        !           247:         * Note: IMP_RCVBUF includes the leader.
        !           248:          */
        !           249: 
        !           250:         x = spl5();
        !           251:         info = sc->css_ifuba.ifu_r.ifrw_info;
        !           252:         addr->css_iba = (u_short)info;
        !           253:         addr->css_iwc = -(IMP_RCVBUF >> 1);
        !           254:         addr->css_icsr = 
        !           255:                 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
        !           256:         splx(x);
        !           257:        return(1);
        !           258: 
        !           259: down:
        !           260:        ui->ui_alive = 0;
        !           261:        return(0);
        !           262: }
        !           263: 
        !           264: /*
        !           265:  * Drop the host ready line to mark host down.
        !           266:  * UNTESTED.
        !           267:  */
        !           268: cssdown(unit)
        !           269:        int unit;
        !           270: {
        !           271:         register struct cssdevice *addr;
        !           272: 
        !           273:        addr = (struct cssdevice *)(cssinfo[unit]->ui_addr);
        !           274:         /* reset the imp interface. */
        !           275:         addr->css_icsr = CSS_CLR;
        !           276:         addr->css_ocsr = CSS_CLR;
        !           277:        DELAY(100);
        !           278:        addr->css_icsr = 0;
        !           279:        addr->css_ocsr = 0;
        !           280:        cssoflush(unit);
        !           281:        return (1);
        !           282: }
        !           283: 
        !           284: cssoflush(unit)
        !           285:        int unit;
        !           286: {
        !           287:        register struct css_softc *sc = &css_softc[unit];
        !           288: 
        !           289:        sc->css_imp->imp_cb.ic_oactive = 0;
        !           290:        if (sc->css_ifuba.ifu_xtofree) {
        !           291:                m_freem(sc->css_ifuba.ifu_xtofree);
        !           292:                sc->css_ifuba.ifu_xtofree = 0;
        !           293:        }
        !           294: }
        !           295: 
        !           296: /*
        !           297:  * Start output on an interface.
        !           298:  */
        !           299: cssoutput(unit, m)
        !           300:         int unit;
        !           301:         struct mbuf *m;
        !           302: {
        !           303:         int info;
        !           304:         struct uba_device *ui = cssinfo[unit];
        !           305:         register struct css_softc *sc = &css_softc[unit];
        !           306:         register struct cssdevice *addr;
        !           307: 
        !           308:         sc->css_olen = if_wubaput(&sc->css_ifuba, m);
        !           309:         /*
        !           310:          * Have request mapped to UNIBUS for transmission.
        !           311:          * Purge any stale data from the BDP, and start the output.
        !           312:          */
        !           313:        if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
        !           314:                UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp);
        !           315:         addr = (struct cssdevice *)ui->ui_addr;
        !           316:         info = sc->css_ifuba.ifu_w.ifrw_info;
        !           317:         addr->css_oba = (u_short)info;
        !           318:         addr->css_owc = -((sc->css_olen + 1) >> 1);
        !           319:         addr->css_ocsr =
        !           320:            (u_short)(CSS_IE | OUT_ENLB | ((info & 0x30000) >> 12) | CSS_GO);
        !           321:         sc->css_imp->imp_cb.ic_oactive = 1;
        !           322: }
        !           323: 
        !           324: /*
        !           325:  * Output interrupt handler.
        !           326:  */
        !           327: cssxint(unit)
        !           328: {
        !           329:         register struct uba_device *ui = cssinfo[unit];
        !           330:         register struct css_softc *sc = &css_softc[unit];
        !           331:         register struct cssdevice *addr;
        !           332: 
        !           333:         addr = (struct cssdevice *)ui->ui_addr;
        !           334:         if (sc->css_imp->imp_cb.ic_oactive == 0) {
        !           335:                 printf("css%d: stray output interrupt csr=%b\n",
        !           336:                        unit, addr->css_ocsr, CSS_OUTBITS);
        !           337:                 return;
        !           338:         }
        !           339:         sc->css_imp->imp_if.if_opackets++;
        !           340:         sc->css_imp->imp_cb.ic_oactive = 0;
        !           341:         if (addr->css_ocsr & CSS_ERR){
        !           342:                 sc->css_imp->imp_if.if_oerrors++;
        !           343:                 printf("css%d: output error, ocsr=%b icsr=%b\n", unit,
        !           344:                         addr->css_ocsr, CSS_OUTBITS,
        !           345:                        addr->css_icsr, CSS_INBITS);
        !           346:        }
        !           347:        if (sc->css_ifuba.ifu_xtofree) {
        !           348:                m_freem(sc->css_ifuba.ifu_xtofree);
        !           349:                sc->css_ifuba.ifu_xtofree = 0;
        !           350:        }
        !           351:        impstart(sc->css_imp);
        !           352: }
        !           353: 
        !           354: /*
        !           355:  * Input interrupt handler
        !           356:  */
        !           357: cssrint(unit)
        !           358: {
        !           359:         register struct css_softc *sc = &css_softc[unit];
        !           360:         register struct cssdevice *addr;
        !           361:         struct mbuf *m;
        !           362:         int len, info;
        !           363: 
        !           364:         sc->css_imp->imp_if.if_ipackets++;
        !           365: 
        !           366:         /*
        !           367:          * Purge BDP; flush message if error indicated.
        !           368:          */
        !           369: 
        !           370:         addr = (struct cssdevice *)cssinfo[unit]->ui_addr;
        !           371:        if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
        !           372:                UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp);
        !           373:         if (addr->css_icsr & CSS_ERR) {
        !           374:                 printf("css%d: recv error, csr=%b\n", unit,
        !           375:                     addr->css_icsr, CSS_INBITS);
        !           376:                 sc->css_imp->imp_if.if_ierrors++;
        !           377:                 sc->css_flush = 1;
        !           378:         }
        !           379: 
        !           380:         if (sc->css_flush) {
        !           381:                 if (addr->css_icsr & IN_EOM)
        !           382:                         sc->css_flush = 0;
        !           383:                 goto setup;
        !           384:         }
        !           385: 
        !           386:         len = IMP_RCVBUF + (addr->css_iwc << 1);
        !           387:        if (len < 0 || len > IMP_RCVBUF) {
        !           388:                printf("css%d: bad length=%d\n", len);
        !           389:                sc->css_imp->imp_if.if_ierrors++;
        !           390:                goto setup;
        !           391:        }
        !           392: 
        !           393:         /*
        !           394:          * The offset parameter is always 0 since using
        !           395:          * trailers on the ARPAnet is insane.
        !           396:          */
        !           397:         m = if_rubaget(&sc->css_ifuba, len, 0, &sc->css_imp->imp_if);
        !           398:         if (m == 0)
        !           399:                 goto setup;
        !           400:         if ((addr->css_icsr & IN_EOM) == 0) {
        !           401:                if (sc->css_iq)
        !           402:                        m_cat(sc->css_iq, m);
        !           403:                else
        !           404:                        sc->css_iq = m;
        !           405:                goto setup;
        !           406:        }
        !           407:        if (sc->css_iq) {
        !           408:                m_cat(sc->css_iq, m);
        !           409:                m = sc->css_iq;
        !           410:                sc->css_iq = 0;
        !           411:         }
        !           412:         impinput(unit, m);
        !           413: 
        !           414: setup:
        !           415:         /*
        !           416:          * Setup for next message.
        !           417:          */
        !           418:         info = sc->css_ifuba.ifu_r.ifrw_info;
        !           419:         addr->css_iba = (u_short)info;
        !           420:         addr->css_iwc = - (IMP_RCVBUF >> 1);
        !           421:         addr->css_icsr =
        !           422:                 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
        !           423: }
        !           424: #endif

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