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Annotation of 43BSD/sys/vaxif/if_css.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)if_css.c    7.1 (Berkeley) 6/5/86
        !             7:  */
        !             8: 
        !             9: #include "css.h"
        !            10: #if NCSS > 0
        !            11: 
        !            12: /*
        !            13:  * DEC/CSS IMP11-A ARPAnet IMP interface driver.
        !            14:  * Since "imp11a" is such a mouthful, it is called
        !            15:  * "css" after the LH/DH being called "acc".
        !            16:  *
        !            17:  * Configuration notes:
        !            18:  *
        !            19:  * As delivered from DEC/CSS, it
        !            20:  * is addressed and vectored as two DR11-B's.  This makes
        !            21:  * Autoconfig almost IMPOSSIBLE.  To make it work, the
        !            22:  * interrupt vectors must be restrapped to make the vectors
        !            23:  * consecutive.  The 020 hole between the CSR addresses is
        !            24:  * tolerated, althought that could be cleaned-up also.
        !            25:  *
        !            26:  * Additionally, the TRANSMIT side of the IMP11-A has the
        !            27:  * lower address of the two subunits, so the vector ordering
        !            28:  * in the CONFIG file is reversed from most other devices.
        !            29:  * It should be:
        !            30:  *
        !            31:  * device css0 ....  cssxint cssrint
        !            32:  *
        !            33:  * If you get it wrong, it will still autoconfig, but will just
        !            34:  * sit there with RECEIVE IDLE indicated on the front panel.
        !            35:  */
        !            36: #include "../machine/pte.h"
        !            37: 
        !            38: #include "param.h"
        !            39: #include "systm.h"
        !            40: #include "mbuf.h"
        !            41: #include "buf.h"
        !            42: #include "protosw.h"
        !            43: #include "socket.h"
        !            44: #include "vmmac.h"
        !            45: 
        !            46: #include "../net/if.h"
        !            47: #include "../netimp/if_imp.h"
        !            48: 
        !            49: #include "../vax/cpu.h"
        !            50: #include "../vax/mtpr.h"
        !            51: #include "if_cssreg.h"
        !            52: #include "if_uba.h"
        !            53: #include "../vaxuba/ubareg.h"
        !            54: #include "../vaxuba/ubavar.h"
        !            55: 
        !            56: int     cssprobe(), cssattach(), cssrint(), cssxint();
        !            57: struct  uba_device *cssinfo[NCSS];
        !            58: u_short cssstd[] = { 0 };
        !            59: struct  uba_driver cssdriver =
        !            60:         { cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo };
        !            61: #define CSSUNIT(x)      minor(x)
        !            62: 
        !            63: int     cssinit(), cssstart(), cssreset();
        !            64: 
        !            65: /*
        !            66:  * "Lower half" of IMP interface driver.
        !            67:  *
        !            68:  * Each IMP interface is handled by a common module which handles
        !            69:  * the IMP-host protocol and a hardware driver which manages the
        !            70:  * hardware specific details of talking with the IMP.
        !            71:  *
        !            72:  * The hardware portion of the IMP driver handles DMA and related
        !            73:  * management of UNIBUS resources.  The IMP protocol module interprets
        !            74:  * contents of these messages and "controls" the actions of the
        !            75:  * hardware module during IMP resets, but not, for instance, during
        !            76:  * UNIBUS resets.
        !            77:  *
        !            78:  * The two modules are coupled at "attach time", and ever after,
        !            79:  * through the imp interface structure.  Higher level protocols,
        !            80:  * e.g. IP, interact with the IMP driver, rather than the CSS.
        !            81:  */
        !            82: struct  css_softc {
        !            83:         struct  ifnet *css_if;          /* pointer to IMP's ifnet struct */
        !            84:         struct  impcb *css_ic;          /* data structure shared with IMP */
        !            85:         struct  ifuba css_ifuba;        /* UNIBUS resources */
        !            86:         struct  mbuf *css_iq;           /* input reassembly queue */
        !            87:         short   css_olen;               /* size of last message sent */
        !            88:         char    css_flush;              /* flush remainder of message */
        !            89: } css_softc[NCSS];
        !            90: 
        !            91: /*
        !            92:  * Reset the IMP and cause a transmitter interrupt by
        !            93:  * performing a null DMA.
        !            94:  */
        !            95: cssprobe(reg)
        !            96:         caddr_t reg;
        !            97: {
        !            98:         register int br, cvec;          /* r11, r10 value-result */
        !            99:         register struct cssdevice *addr = (struct cssdevice *)reg;
        !           100: 
        !           101: #ifdef lint
        !           102:         br = 0; cvec = br; br = cvec;
        !           103:         cssrint(0); cssxint(0);
        !           104: #endif
        !           105: 
        !           106: 
        !           107:         addr->css_icsr = CSS_CLR;
        !           108:         addr->css_ocsr = CSS_CLR;
        !           109:         DELAY(50000);
        !           110:        addr->css_icsr = 0;
        !           111:        addr->css_ocsr = 0;
        !           112:         DELAY(50000);
        !           113: 
        !           114:        addr->css_oba = 0;
        !           115:        addr->css_owc = -1;
        !           116:         addr->css_ocsr = CSS_IE | CSS_GO;      /* enable interrupts */
        !           117:         DELAY(50000);
        !           118:         addr->css_ocsr = 0;
        !           119: 
        !           120:         return (1);
        !           121: }
        !           122: 
        !           123: /*
        !           124:  * Call the IMP module to allow it to set up its internal
        !           125:  * state, then tie the two modules together by setting up
        !           126:  * the back pointers to common data structures.
        !           127:  */
        !           128: cssattach(ui)
        !           129:         struct uba_device *ui;
        !           130: {
        !           131:         register struct css_softc *sc = &css_softc[ui->ui_unit];
        !           132:         register struct impcb *ip;
        !           133:         struct ifimpcb {
        !           134:                 struct  ifnet ifimp_if;
        !           135:                 struct  impcb ifimp_impcb;
        !           136:         } *ifimp;
        !           137: 
        !           138:         if ((ifimp = (struct ifimpcb *)impattach(ui, cssreset)) == 0)
        !           139:                 return;
        !           140:         sc->css_if = &ifimp->ifimp_if;
        !           141:         ip = &ifimp->ifimp_impcb;
        !           142:         sc->css_ic = ip;
        !           143:         ip->ic_init = cssinit;
        !           144:         ip->ic_start = cssstart;
        !           145:        sc->css_ifuba.ifu_flags = UBA_CANTWAIT | UBA_NEED16;
        !           146: #ifdef notdef
        !           147:        sc->css_ifuba.ifu_flags =| UBA_NEEDBDP;
        !           148: #endif
        !           149: }
        !           150: 
        !           151: /*
        !           152:  * Reset interface after UNIBUS reset.
        !           153:  * If interface is on specified uba, reset its state.
        !           154:  */
        !           155: cssreset(unit, uban)
        !           156:         int unit, uban;
        !           157: {
        !           158:         register struct uba_device *ui;
        !           159:         struct css_softc *sc;
        !           160: 
        !           161:         if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           162:             ui->ui_ubanum != uban)
        !           163:                 return;
        !           164:         printf(" css%d", unit);
        !           165:         sc = &css_softc[unit];
        !           166:        sc->css_if->if_flags &= ~IFF_RUNNING;
        !           167:         /* must go through IMP to allow it to set state */
        !           168:         (*sc->css_if->if_init)(unit);
        !           169: }
        !           170: 
        !           171: /*
        !           172:  * Initialize interface: clear recorded pending operations,
        !           173:  * and retrieve, and reinitialize UNIBUS resources.
        !           174:  */
        !           175: cssinit(unit)
        !           176:         int unit;
        !           177: {       
        !           178:         register struct css_softc *sc;
        !           179:         register struct uba_device *ui;
        !           180:         register struct cssdevice *addr;
        !           181:         int x, info;
        !           182: 
        !           183:        if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0) {
        !           184:                printf("css%d: not alive\n", unit);
        !           185:                return(0);
        !           186:        }
        !           187:        sc = &css_softc[unit];
        !           188: 
        !           189:        /*
        !           190:         * Header length is 0 to if_ubainit since we have to pass
        !           191:         * the IMP leader up to the protocol interpretaion
        !           192:         * routines.  If we had the deader length as
        !           193:         * sizeof(struct imp_leader), then the if_ routines
        !           194:         * would assume we handle it on input and output.
        !           195:         */
        !           196:        
        !           197:         if (if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,(int)btoc(IMPMTU)) == 0) {
        !           198:                 printf("css%d: can't initialize\n", unit);
        !           199:                ui->ui_alive = 0;
        !           200:                sc->css_if->if_flags &= ~(IFF_UP | IFF_RUNNING);
        !           201:                return(0);
        !           202:         }
        !           203:        sc->css_if->if_flags |= IFF_RUNNING;
        !           204:         addr = (struct cssdevice *)ui->ui_addr;
        !           205: 
        !           206:         /* reset the imp interface. */
        !           207:         x = spl5();
        !           208:         addr->css_icsr = CSS_CLR;
        !           209:         addr->css_ocsr = CSS_CLR;
        !           210:        DELAY(100);
        !           211:        addr->css_icsr = 0;
        !           212:        addr->css_ocsr = 0;
        !           213:         addr->css_icsr = IN_HRDY;       /* close the relay */
        !           214:        DELAY(5000);
        !           215:         splx(x);
        !           216: 
        !           217:         /*
        !           218:         * This may hang if the imp isn't really there.
        !           219:         * Will test and verify safe operation.
        !           220:         */
        !           221: 
        !           222:        x = 500;
        !           223:        while (x-- > 0) {
        !           224:                if ((addr->css_icsr & (IN_HRDY|IN_IMPNR)) == IN_HRDY) 
        !           225:                        break;
        !           226:                 addr->css_icsr = IN_HRDY;      /* close the relay */
        !           227:                 DELAY(5000);
        !           228:         }
        !           229: 
        !           230:        if (x <= 0) {
        !           231:                printf("css%d: imp doesn't respond, icsr=%b\n", unit,
        !           232:                        CSS_INBITS, addr->css_icsr);
        !           233:                goto down;
        !           234:        }
        !           235: 
        !           236:         /*
        !           237:          * Put up a read.  We can't restart any outstanding writes
        !           238:          * until we're back in synch with the IMP (i.e. we've flushed
        !           239:          * the NOOPs it throws at us).
        !           240:         * Note: IMPMTU includes the leader.
        !           241:          */
        !           242: 
        !           243:         x = spl5();
        !           244:         info = sc->css_ifuba.ifu_r.ifrw_info;
        !           245:         addr->css_iba = (u_short)info;
        !           246:         addr->css_iwc = -(IMPMTU >> 1);
        !           247:         addr->css_icsr = 
        !           248:                 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
        !           249:         splx(x);
        !           250:        return(1);
        !           251: 
        !           252: down:
        !           253:        ui->ui_alive = 0;
        !           254:        return(0);
        !           255: }
        !           256: 
        !           257: /*
        !           258:  * Start output on an interface.
        !           259:  */
        !           260: cssstart(dev)
        !           261:         dev_t dev;
        !           262: {
        !           263:         int unit = CSSUNIT(dev), info;
        !           264:         struct uba_device *ui = cssinfo[unit];
        !           265:         register struct css_softc *sc = &css_softc[unit];
        !           266:         register struct cssdevice *addr;
        !           267:         struct mbuf *m;
        !           268:         u_short cmd;
        !           269: 
        !           270:         if (sc->css_ic->ic_oactive)
        !           271:                 goto restart;
        !           272:         
        !           273:         /*
        !           274:          * Not already active, deqeue a request and
        !           275:          * map it onto the UNIBUS.  If no more
        !           276:          * requeusts, just return.
        !           277:          */
        !           278:         IF_DEQUEUE(&sc->css_if->if_snd, m);
        !           279:         if (m == 0) {
        !           280:                 sc->css_ic->ic_oactive = 0;
        !           281:                 return;
        !           282:         }
        !           283:         sc->css_olen = if_wubaput(&sc->css_ifuba, m);
        !           284: 
        !           285: restart:
        !           286:         /*
        !           287:          * Have request mapped to UNIBUS for transmission.
        !           288:          * Purge any stale data from the BDP, and start the output.
        !           289:          */
        !           290:        if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
        !           291:                UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp);
        !           292:         addr = (struct cssdevice *)ui->ui_addr;
        !           293:         info = sc->css_ifuba.ifu_w.ifrw_info;
        !           294:         addr->css_oba = (u_short)info;
        !           295:         addr->css_owc = -((sc->css_olen + 1) >> 1);
        !           296:         cmd = CSS_IE | OUT_ENLB | ((info & 0x30000) >> 12) | CSS_GO;
        !           297:         addr->css_ocsr = cmd;
        !           298:         sc->css_ic->ic_oactive = 1;
        !           299: }
        !           300: 
        !           301: /*
        !           302:  * Output interrupt handler.
        !           303:  */
        !           304: cssxint(unit)
        !           305: {
        !           306:         register struct uba_device *ui = cssinfo[unit];
        !           307:         register struct css_softc *sc = &css_softc[unit];
        !           308:         register struct cssdevice *addr;
        !           309: 
        !           310:         addr = (struct cssdevice *)ui->ui_addr;
        !           311:         if (sc->css_ic->ic_oactive == 0) {
        !           312:                 printf("css%d: stray output interrupt csr=%b\n",
        !           313:                        unit, addr->css_ocsr, CSS_OUTBITS);
        !           314:                 return;
        !           315:         }
        !           316:         sc->css_if->if_opackets++;
        !           317:         sc->css_ic->ic_oactive = 0;
        !           318:         if (addr->css_ocsr & CSS_ERR){
        !           319:                 sc->css_if->if_oerrors++;
        !           320:                 printf("css%d: output error, ocsr=%b icsr=%b\n", unit,
        !           321:                         addr->css_ocsr, CSS_OUTBITS,
        !           322:                        addr->css_icsr, CSS_INBITS);
        !           323:        }
        !           324:        if (sc->css_ifuba.ifu_xtofree) {
        !           325:                m_freem(sc->css_ifuba.ifu_xtofree);
        !           326:                sc->css_ifuba.ifu_xtofree = 0;
        !           327:        }
        !           328:        if (sc->css_if->if_snd.ifq_head)
        !           329:                cssstart(unit);
        !           330: }
        !           331: 
        !           332: /*
        !           333:  * Input interrupt handler
        !           334:  */
        !           335: cssrint(unit)
        !           336: {
        !           337:         register struct css_softc *sc = &css_softc[unit];
        !           338:         register struct cssdevice *addr;
        !           339:         struct mbuf *m;
        !           340:         int len, info;
        !           341: 
        !           342:         sc->css_if->if_ipackets++;
        !           343: 
        !           344:         /*
        !           345:          * Purge BDP; flush message if error indicated.
        !           346:          */
        !           347: 
        !           348:         addr = (struct cssdevice *)cssinfo[unit]->ui_addr;
        !           349:        if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
        !           350:                UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp);
        !           351:         if (addr->css_icsr & CSS_ERR) {
        !           352:                 printf("css%d: recv error, csr=%b\n", unit,
        !           353:                     addr->css_icsr, CSS_INBITS);
        !           354:                 sc->css_if->if_ierrors++;
        !           355:                 sc->css_flush = 1;
        !           356:         }
        !           357: 
        !           358:         if (sc->css_flush) {
        !           359:                 if (addr->css_icsr & IN_EOM)
        !           360:                         sc->css_flush = 0;
        !           361:                 goto setup;
        !           362:         }
        !           363: 
        !           364:         len = IMPMTU + (addr->css_iwc << 1);
        !           365:        if (len < 0 || len > IMPMTU) {
        !           366:                printf("css%d: bad length=%d\n", len);
        !           367:                sc->css_if->if_ierrors++;
        !           368:                goto setup;
        !           369:        }
        !           370: 
        !           371:         /*
        !           372:          * The offset parameter is always 0 since using
        !           373:          * trailers on the ARPAnet is insane.
        !           374:          */
        !           375:         m = if_rubaget(&sc->css_ifuba, len, 0, sc->css_if);
        !           376:         if (m == 0)
        !           377:                 goto setup;
        !           378:         if ((addr->css_icsr & IN_EOM) == 0) {
        !           379:                if (sc->css_iq)
        !           380:                        m_cat(sc->css_iq, m);
        !           381:                else
        !           382:                        sc->css_iq = m;
        !           383:                goto setup;
        !           384:        }
        !           385:        if (sc->css_iq) {
        !           386:                m_cat(sc->css_iq, m);
        !           387:                m = sc->css_iq;
        !           388:                sc->css_iq = 0;
        !           389:         }
        !           390:         impinput(unit, m);
        !           391: 
        !           392: setup:
        !           393:         /*
        !           394:          * Setup for next message.
        !           395:          */
        !           396:         info = sc->css_ifuba.ifu_r.ifrw_info;
        !           397:         addr->css_iba = (u_short)info;
        !           398:         addr->css_iwc = - (IMPMTU >> 1);
        !           399:         addr->css_icsr =
        !           400:                 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
        !           401: }
        !           402: #endif

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