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

Defined functions

cssattach defined in line 128; used 2 times
cssinit defined in line 175; used 2 times
cssprobe defined in line 95; used 2 times
cssreset defined in line 155; used 2 times
cssrint defined in line 335; used 2 times
cssstart defined in line 260; used 3 times
cssxint defined in line 304; used 2 times

Defined variables

css_softc defined in line 89; used 6 times
cssdriver defined in line 59; never used
cssinfo defined in line 57; used 6 times
cssstd defined in line 58; used 1 times
  • in line 60

Defined struct's

css_softc defined in line 82; used 12 times
ifimpcb defined in line 133; used 2 times
  • in line 138(2)

Defined macros

CSSUNIT defined in line 61; used 1 times
Last modified: 1986-06-06
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