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Annotation of 42BSD/sys/vaxif/if_css.c, revision 1.1

1.1     ! root        1: /*      if_css.c     6.1     83/07/29     */
        !             2: 
        !             3: #include "css.h"
        !             4: 
        !             5: /*
        !             6:  * DEC/CSS IMP11-A ARPAnet IMP interface driver.
        !             7:  * Since "imp11a" is such a mouthful, it is called
        !             8:  * "css" after the LH/DH being called "acc".
        !             9:  *
        !            10:  * Configuration notes:
        !            11:  *
        !            12:  * As delivered from DEC/CSS, it
        !            13:  * is addressed and vectored as two DR11-B's.  This makes
        !            14:  * Autoconfig almost IMPOSSIBLE.  To make it work, the
        !            15:  * interrupt vectors must be restrapped to make the vectors
        !            16:  * consecutive.  The 020 hole between the CSR addresses is
        !            17:  * tolerated, althought that could be cleaned-up also.
        !            18:  *
        !            19:  * Additionally, the TRANSMIT side of the IMP11-A has the
        !            20:  * lower address of the two subunits, so the vector ordering
        !            21:  * in the CONFIG file is reversed from most other devices.
        !            22:  * It should be:
        !            23:  *
        !            24:  * device css0 ....  cssxint cssrint
        !            25:  *
        !            26:  * If you get it wrong, it will still autoconfig, but will just
        !            27:  * sit there with RECIEVE IDLE indicated on the front panel.
        !            28:  */
        !            29: #include "../machine/pte.h"
        !            30: 
        !            31: #include "../h/param.h"
        !            32: #include "../h/systm.h"
        !            33: #include "../h/mbuf.h"
        !            34: #include "../h/buf.h"
        !            35: #include "../h/protosw.h"
        !            36: #include "../h/socket.h"
        !            37: #include "../h/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 "../vaxif/if_cssreg.h"
        !            45: #include "../vaxif/if_uba.h"
        !            46: #include "../vaxuba/ubareg.h"
        !            47: #include "../vaxuba/ubavar.h"
        !            48: 
        !            49: int     cssprobe(), cssattach(), cssrint(), cssxint();
        !            50: struct  uba_device *cssinfo[NCSS];
        !            51: u_short cssstd[] = { 0 };
        !            52: struct  uba_driver cssdriver =
        !            53:         { cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo };
        !            54: #define CSSUNIT(x)      minor(x)
        !            55: 
        !            56: int     cssinit(), cssstart(), cssreset();
        !            57: 
        !            58: /*
        !            59:  * "Lower half" of IMP interface driver.
        !            60:  *
        !            61:  * Each IMP interface is handled by a common module which handles
        !            62:  * the IMP-host protocol and a hardware driver which manages the
        !            63:  * hardware specific details of talking with the IMP.
        !            64:  *
        !            65:  * The hardware portion of the IMP driver handles DMA and related
        !            66:  * management of UNIBUS resources.  The IMP protocol module interprets
        !            67:  * contents of these messages and "controls" the actions of the
        !            68:  * hardware module during IMP resets, but not, for instance, during
        !            69:  * UNIBUS resets.
        !            70:  *
        !            71:  * The two modules are coupled at "attach time", and ever after,
        !            72:  * through the imp interface structure.  Higher level protocols,
        !            73:  * e.g. IP, interact with the IMP driver, rather than the CSS.
        !            74:  */
        !            75: struct  css_softc {
        !            76:         struct  ifnet *css_if;          /* pointer to IMP's ifnet struct */
        !            77:         struct  impcb *css_ic;          /* data structure shared with IMP */
        !            78:         struct  ifuba css_ifuba;        /* UNIBUS resources */
        !            79:         struct  mbuf *css_iq;           /* input reassembly queue */
        !            80:         short   css_olen;               /* size of last message sent */
        !            81:         char    css_flush;              /* flush remainder of message */
        !            82: } css_softc[NCSS];
        !            83: 
        !            84: /*
        !            85:  * Reset the IMP and cause a transmitter interrupt by
        !            86:  * performing a null DMA.
        !            87:  */
        !            88: cssprobe(reg)
        !            89:         caddr_t reg;
        !            90: {
        !            91:         register int br, cvec;          /* r11, r10 value-result */
        !            92:         register struct cssdevice *addr = (struct cssdevice *)reg;
        !            93: 
        !            94: #ifdef lint
        !            95:         br = 0; cvec = br; br = cvec;
        !            96:         cssrint(0); cssxint(0);
        !            97: #endif
        !            98: 
        !            99: 
        !           100:         addr->css_icsr = CSS_CLR;
        !           101:         addr->css_ocsr = CSS_CLR;
        !           102:         DELAY(50000);
        !           103:        addr->css_icsr = 0;
        !           104:        addr->css_ocsr = 0;
        !           105:         DELAY(50000);
        !           106: 
        !           107:        addr->css_oba = 0;
        !           108:        addr->css_owc = -1;
        !           109:         addr->css_ocsr = CSS_IE | CSS_GO;      /* enable interrupts */
        !           110:         DELAY(50000);
        !           111:         addr->css_ocsr = 0;
        !           112: 
        !           113:         return (1);
        !           114: }
        !           115: 
        !           116: /*
        !           117:  * Call the IMP module to allow it to set up its internal
        !           118:  * state, then tie the two modules together by setting up
        !           119:  * the back pointers to common data structures.
        !           120:  */
        !           121: cssattach(ui)
        !           122:         struct uba_device *ui;
        !           123: {
        !           124:         register struct css_softc *sc = &css_softc[ui->ui_unit];
        !           125:         register struct impcb *ip;
        !           126:         struct ifimpcb {
        !           127:                 struct  ifnet ifimp_if;
        !           128:                 struct  impcb ifimp_impcb;
        !           129:         } *ifimp;
        !           130: 
        !           131:         if ((ifimp = (struct ifimpcb *)impattach(ui, cssreset)) == 0)
        !           132:                 panic("cssattach");             /* XXX */
        !           133:         sc->css_if = &ifimp->ifimp_if;
        !           134:         ip = &ifimp->ifimp_impcb;
        !           135:         sc->css_ic = ip;
        !           136:         ip->ic_init = cssinit;
        !           137:         ip->ic_start = cssstart;
        !           138:        sc->css_ifuba.ifu_flags = UBA_CANTWAIT | UBA_NEED16;
        !           139: #ifdef notdef
        !           140:        sc->css_ifuba.ifu_flags =| UBA_NEEDBDP;
        !           141: #endif
        !           142: }
        !           143: 
        !           144: /*
        !           145:  * Reset interface after UNIBUS reset.
        !           146:  * If interface is on specified uba, reset its state.
        !           147:  */
        !           148: cssreset(unit, uban)
        !           149:         int unit, uban;
        !           150: {
        !           151:         register struct uba_device *ui;
        !           152:         struct css_softc *sc;
        !           153: 
        !           154:         if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0 ||
        !           155:             ui->ui_ubanum != uban)
        !           156:                 return;
        !           157:         printf(" css%d", unit);
        !           158:         sc = &css_softc[unit];
        !           159:         /* must go through IMP to allow it to set state */
        !           160:         (*sc->css_if->if_init)(unit);
        !           161: }
        !           162: 
        !           163: /*
        !           164:  * Initialize interface: clear recorded pending operations,
        !           165:  * and retrieve, and reinitialize UNIBUS resources.
        !           166:  */
        !           167: cssinit(unit)
        !           168:         int unit;
        !           169: {       
        !           170:         register struct css_softc *sc;
        !           171:         register struct uba_device *ui;
        !           172:         register struct cssdevice *addr;
        !           173:         int x, info;
        !           174: 
        !           175:        if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0) {
        !           176:                printf("css%d: not alive\n", unit);
        !           177:                return(0);
        !           178:        }
        !           179:        sc = &css_softc[unit];
        !           180: 
        !           181:        /*
        !           182:         * Header length is 0 to if_ubainit since we have to pass
        !           183:         * the IMP leader up to the protocol interpretaion
        !           184:         * routines.  If we had the deader length as
        !           185:         * sizeof(struct imp_leader), then the if_ routines
        !           186:         * would assume we handle it on input and output.
        !           187:         */
        !           188:        
        !           189:         if (if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,(int)btoc(IMPMTU)) == 0) {
        !           190:                 printf("css%d: can't initialize\n", unit);
        !           191:                ui->ui_alive = 0;
        !           192:                return(0);
        !           193:         }
        !           194:         addr = (struct cssdevice *)ui->ui_addr;
        !           195: 
        !           196:         /* reset the imp interface. */
        !           197:         x = spl5();
        !           198:         addr->css_icsr = CSS_CLR;
        !           199:         addr->css_ocsr = CSS_CLR;
        !           200:        DELAY(100);
        !           201:        addr->css_icsr = 0;
        !           202:        addr->css_ocsr = 0;
        !           203:         addr->css_icsr = IN_HRDY;       /* close the relay */
        !           204:        DELAY(5000);
        !           205:         splx(x);
        !           206: 
        !           207:         /*
        !           208:         * This may hang if the imp isn't really there.
        !           209:         * Will test and verify safe operation.
        !           210:         */
        !           211: 
        !           212:        x = 500;
        !           213:        while (x-- > 0) {
        !           214:                if ((addr->css_icsr & (IN_HRDY|IN_IMPNR)) == IN_HRDY) 
        !           215:                        break;
        !           216:                 addr->css_icsr = IN_HRDY;      /* close the relay */
        !           217:                 DELAY(5000);
        !           218:         }
        !           219: 
        !           220:        if (x <= 0) {
        !           221:                printf("css%d: imp doesn't respond, icsr=%b\n", unit,
        !           222:                        CSS_INBITS, addr->css_icsr);
        !           223:                goto down;
        !           224:        }
        !           225: 
        !           226:         /*
        !           227:          * Put up a read.  We can't restart any outstanding writes
        !           228:          * until we're back in synch with the IMP (i.e. we've flushed
        !           229:          * the NOOPs it throws at us).
        !           230:         * Note: IMPMTU includes the leader.
        !           231:          */
        !           232: 
        !           233:         x = spl5();
        !           234:         info = sc->css_ifuba.ifu_r.ifrw_info;
        !           235:         addr->css_iba = (u_short)info;
        !           236:         addr->css_iwc = -(IMPMTU >> 1);
        !           237:         addr->css_icsr = 
        !           238:                 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
        !           239:         splx(x);
        !           240:        return(1);
        !           241: 
        !           242: down:
        !           243:        ui->ui_alive = 0;
        !           244:        return(0);
        !           245: }
        !           246: 
        !           247: /*
        !           248:  * Start output on an interface.
        !           249:  */
        !           250: cssstart(dev)
        !           251:         dev_t dev;
        !           252: {
        !           253:         int unit = CSSUNIT(dev), info;
        !           254:         struct uba_device *ui = cssinfo[unit];
        !           255:         register struct css_softc *sc = &css_softc[unit];
        !           256:         register struct cssdevice *addr;
        !           257:         struct mbuf *m;
        !           258:         u_short cmd;
        !           259: 
        !           260:         if (sc->css_ic->ic_oactive)
        !           261:                 goto restart;
        !           262:         
        !           263:         /*
        !           264:          * Not already active, deqeue a request and
        !           265:          * map it onto the UNIBUS.  If no more
        !           266:          * requeusts, just return.
        !           267:          */
        !           268:         IF_DEQUEUE(&sc->css_if->if_snd, m);
        !           269:         if (m == 0) {
        !           270:                 sc->css_ic->ic_oactive = 0;
        !           271:                 return;
        !           272:         }
        !           273:         sc->css_olen = if_wubaput(&sc->css_ifuba, m);
        !           274: 
        !           275: restart:
        !           276:         /*
        !           277:          * Have request mapped to UNIBUS for transmission.
        !           278:          * Purge any stale data from the BDP, and start the output.
        !           279:          */
        !           280:        if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
        !           281:                UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp);
        !           282:         addr = (struct cssdevice *)ui->ui_addr;
        !           283:         info = sc->css_ifuba.ifu_w.ifrw_info;
        !           284:         addr->css_oba = (u_short)info;
        !           285:         addr->css_owc = -((sc->css_olen + 1) >> 1);
        !           286:         cmd = CSS_IE | OUT_ENLB | ((info & 0x30000) >> 12) | CSS_GO;
        !           287:         addr->css_ocsr = cmd;
        !           288:         sc->css_ic->ic_oactive = 1;
        !           289: }
        !           290: 
        !           291: /*
        !           292:  * Output interrupt handler.
        !           293:  */
        !           294: cssxint(unit)
        !           295: {
        !           296:         register struct uba_device *ui = cssinfo[unit];
        !           297:         register struct css_softc *sc = &css_softc[unit];
        !           298:         register struct cssdevice *addr;
        !           299: 
        !           300:         addr = (struct cssdevice *)ui->ui_addr;
        !           301:         if (sc->css_ic->ic_oactive == 0) {
        !           302:                 printf("css%d: stray output interrupt csr=%b\n",
        !           303:                        unit, addr->css_ocsr, CSS_OUTBITS);
        !           304:                 return;
        !           305:         }
        !           306:         sc->css_if->if_opackets++;
        !           307:         sc->css_ic->ic_oactive = 0;
        !           308:         if (addr->css_ocsr & CSS_ERR){
        !           309:                 sc->css_if->if_oerrors++;
        !           310:                 printf("css%d: output error, ocsr=%b icsr=%b\n", unit,
        !           311:                         addr->css_ocsr, CSS_OUTBITS,
        !           312:                        addr->css_icsr, CSS_INBITS);
        !           313:        }
        !           314:        if (sc->css_ifuba.ifu_xtofree) {
        !           315:                m_freem(sc->css_ifuba.ifu_xtofree);
        !           316:                sc->css_ifuba.ifu_xtofree = 0;
        !           317:        }
        !           318:        if (sc->css_if->if_snd.ifq_head)
        !           319:                cssstart(unit);
        !           320: }
        !           321: 
        !           322: /*
        !           323:  * Input interrupt handler
        !           324:  */
        !           325: cssrint(unit)
        !           326: {
        !           327:         register struct css_softc *sc = &css_softc[unit];
        !           328:         register struct cssdevice *addr;
        !           329:         struct mbuf *m;
        !           330:         int len, info;
        !           331: 
        !           332:         sc->css_if->if_ipackets++;
        !           333: 
        !           334:         /*
        !           335:          * Purge BDP; flush message if error indicated.
        !           336:          */
        !           337: 
        !           338:         addr = (struct cssdevice *)cssinfo[unit]->ui_addr;
        !           339:        if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP)
        !           340:                UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp);
        !           341:         if (addr->css_icsr & CSS_ERR) {
        !           342:                 printf("css%d: recv error, csr=%b\n", unit,
        !           343:                     addr->css_icsr, CSS_INBITS);
        !           344:                 sc->css_if->if_ierrors++;
        !           345:                 sc->css_flush = 1;
        !           346:         }
        !           347: 
        !           348:         if (sc->css_flush) {
        !           349:                 if (addr->css_icsr & IN_EOM)
        !           350:                         sc->css_flush = 0;
        !           351:                 goto setup;
        !           352:         }
        !           353: 
        !           354:         len = IMPMTU + (addr->css_iwc << 1);
        !           355:        if (len < 0 || len > IMPMTU) {
        !           356:                printf("css%d: bad length=%d\n", len);
        !           357:                sc->css_if->if_ierrors++;
        !           358:                goto setup;
        !           359:        }
        !           360: 
        !           361:         /*
        !           362:          * The last parameter is always 0 since using
        !           363:          * trailers on the ARPAnet is insane.
        !           364:          */
        !           365:         m = if_rubaget(&sc->css_ifuba, len, 0);
        !           366:         if (m == 0)
        !           367:                 goto setup;
        !           368:         if ((addr->css_icsr & IN_EOM) == 0) {
        !           369:                if (sc->css_iq)
        !           370:                        m_cat(sc->css_iq, m);
        !           371:                else
        !           372:                        sc->css_iq = m;
        !           373:                goto setup;
        !           374:        }
        !           375:        if (sc->css_iq) {
        !           376:                m_cat(sc->css_iq, m);
        !           377:                m = sc->css_iq;
        !           378:                sc->css_iq = 0;
        !           379:         }
        !           380:         impinput(unit, m);
        !           381: 
        !           382: setup:
        !           383:         /*
        !           384:          * Setup for next message.
        !           385:          */
        !           386:         info = sc->css_ifuba.ifu_r.ifrw_info;
        !           387:         addr->css_iba = (u_short)info;
        !           388:         addr->css_iwc = - (IMPMTU >> 1);
        !           389:         addr->css_icsr =
        !           390:                 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO;
        !           391: }

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