1 /* if_acc.c 4.16 82/06/14 */ 2 3 #include "acc.h" 4 #ifdef NACC > 0 5 6 /* 7 * ACC LH/DH ARPAnet IMP interface driver. 8 */ 9 10 #include "../h/param.h" 11 #include "../h/systm.h" 12 #include "../h/mbuf.h" 13 #include "../h/pte.h" 14 #include "../h/buf.h" 15 #include "../h/protosw.h" 16 #include "../h/socket.h" 17 #include "../h/ubareg.h" 18 #include "../h/ubavar.h" 19 #include "../h/cpu.h" 20 #include "../h/mtpr.h" 21 #include "../h/vmmac.h" 22 #include "../net/in.h" 23 #include "../net/in_systm.h" 24 #include "../net/if.h" 25 #include "../net/if_acc.h" 26 #include "../net/if_imp.h" 27 #include "../net/if_uba.h" 28 29 int accprobe(), accattach(), accrint(), accxint(); 30 struct uba_device *accinfo[NACC]; 31 u_short accstd[] = { 0 }; 32 struct uba_driver accdriver = 33 { accprobe, 0, accattach, 0, accstd, "acc", accinfo }; 34 #define ACCUNIT(x) minor(x) 35 36 int accinit(), accstart(), accreset(); 37 38 /* 39 * "Lower half" of IMP interface driver. 40 * 41 * Each IMP interface is handled by a common module which handles 42 * the IMP-host protocol and a hardware driver which manages the 43 * hardware specific details of talking with the IMP. 44 * 45 * The hardware portion of the IMP driver handles DMA and related 46 * management of UNIBUS resources. The IMP protocol module interprets 47 * contents of these messages and "controls" the actions of the 48 * hardware module during IMP resets, but not, for instance, during 49 * UNIBUS resets. 50 * 51 * The two modules are coupled at "attach time", and ever after, 52 * through the imp interface structure. Higher level protocols, 53 * e.g. IP, interact with the IMP driver, rather than the ACC. 54 */ 55 struct acc_softc { 56 struct ifnet *acc_if; /* pointer to IMP's ifnet struct */ 57 struct impcb *acc_ic; /* data structure shared with IMP */ 58 struct ifuba acc_ifuba; /* UNIBUS resources */ 59 struct mbuf *acc_iq; /* input reassembly queue */ 60 short acc_olen; /* size of last message sent */ 61 char acc_flush; /* flush remainder of message */ 62 } acc_softc[NACC]; 63 64 #define NACCDEBUG 10000 65 char accdebug[NACCDEBUG]; 66 int accdebugx; 67 68 /* 69 * Reset the IMP and cause a transmitter interrupt by 70 * performing a null DMA. 71 */ 72 accprobe(reg) 73 caddr_t reg; 74 { 75 register int br, cvec; /* r11, r10 value-result */ 76 register struct accdevice *addr = (struct accdevice *)reg; 77 78 COUNT(ACCPROBE); 79 #ifdef lint 80 br = 0; cvec = br; br = cvec; 81 accrint(0); accxint(0); 82 #endif 83 addr->icsr = ACC_RESET; DELAY(5000); 84 addr->ocsr = ACC_RESET; DELAY(5000); 85 addr->ocsr = OUT_BBACK; DELAY(5000); 86 addr->owc = 0; 87 addr->ocsr = ACC_IE | ACC_GO; DELAY(5000); 88 addr->icsr = ACC_RESET; DELAY(5000); 89 addr->ocsr = ACC_RESET; DELAY(5000); 90 if (cvec && cvec != 0x200) /* transmit -> receive */ 91 cvec -= 4; 92 #ifdef ECHACK 93 br = 0x16; 94 #endif 95 return (1); 96 } 97 98 /* 99 * Call the IMP module to allow it to set up its internal 100 * state, then tie the two modules together by setting up 101 * the back pointers to common data structures. 102 */ 103 accattach(ui) 104 struct uba_device *ui; 105 { 106 register struct acc_softc *sc = &acc_softc[ui->ui_unit]; 107 register struct impcb *ip; 108 struct ifimpcb { 109 struct ifnet ifimp_if; 110 struct impcb ifimp_impcb; 111 } *ifimp; 112 113 COUNT(ACCATTACH); 114 if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0) 115 panic("accattach"); 116 sc->acc_if = &ifimp->ifimp_if; 117 ip = &ifimp->ifimp_impcb; 118 sc->acc_ic = ip; 119 ip->ic_init = accinit; 120 ip->ic_start = accstart; 121 sc->acc_ifuba.ifu_flags = UBA_CANTWAIT; 122 #ifdef notdef 123 sc->acc_ifuba.ifu_flags |= UBA_NEEDBDP; 124 #endif 125 } 126 127 /* 128 * Reset interface after UNIBUS reset. 129 * If interface is on specified uba, reset its state. 130 */ 131 accreset(unit, uban) 132 int unit, uban; 133 { 134 register struct uba_device *ui; 135 struct acc_softc *sc; 136 137 COUNT(ACCRESET); 138 if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 || 139 ui->ui_ubanum != uban) 140 return; 141 printf(" acc%d", unit); 142 sc = &acc_softc[unit]; 143 /* must go through IMP to allow it to set state */ 144 (*sc->acc_if->if_init)(unit); 145 } 146 147 /* 148 * Initialize interface: clear recorded pending operations, 149 * and retrieve, and initialize UNIBUS resources. Note 150 * return value is used by IMP init routine to mark IMP 151 * unavailable for outgoing traffic. 152 */ 153 accinit(unit) 154 int unit; 155 { 156 register struct acc_softc *sc; 157 register struct uba_device *ui; 158 register struct accdevice *addr; 159 int info, i; 160 161 COUNT(ACCINIT); 162 if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) { 163 printf("acc%d: not alive\n", unit); 164 return (0); 165 } 166 sc = &acc_softc[unit]; 167 /* 168 * Header length is 0 since we have to passs 169 * the IMP leader up to the protocol interpretation 170 * routines. If we had the header length as 171 * sizeof(struct imp_leader), then the if_ routines 172 * would asssume we handle it on input and output. 173 */ 174 if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0, 175 (int)btoc(IMPMTU)) == 0) { 176 printf("acc%d: can't initialize\n", unit); 177 ui->ui_alive = 0; 178 return (0); 179 } 180 addr = (struct accdevice *)ui->ui_addr; 181 182 /* 183 * Reset the imp interface; 184 * the delays are pure guesswork. 185 */ 186 addr->ocsr = ACC_RESET; DELAY(5000); 187 addr->ocsr = OUT_BBACK; DELAY(5000); /* reset host master ready */ 188 addr->ocsr = 0; 189 if (accinputreset(addr, unit) == 0) { 190 ui->ui_alive = 0; 191 return (0); 192 } 193 194 /* 195 * Put up a read. We can't restart any outstanding writes 196 * until we're back in synch with the IMP (i.e. we've flushed 197 * the NOOPs it throws at us). 198 * Note: IMPMTU includes the leader. 199 */ 200 acctrace("init", addr->icsr); 201 info = sc->acc_ifuba.ifu_r.ifrw_info; 202 addr->iba = (u_short)info; 203 addr->iwc = -(IMPMTU >> 1); 204 #ifdef LOOPBACK 205 addr->ocsr |= OUT_BBACK; 206 #endif 207 addr->icsr = 208 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 209 return (1); 210 } 211 212 accinputreset(addr, unit) 213 register struct accdevice *addr; 214 register int unit; 215 { 216 register int i; 217 218 addr->icsr = ACC_RESET; DELAY(5000); 219 addr->icsr = IN_MRDY | IN_WEN; /* close the relay */ 220 DELAY(10000); 221 /* YECH!!! */ 222 for (i = 0; i < 500; i++) { 223 if ((addr->icsr & IN_HRDY) || 224 (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0) 225 return (1); 226 addr->icsr = IN_MRDY | IN_WEN; DELAY(10000); 227 /* keep turning IN_RMR off */ 228 } 229 printf("acc%d: imp doesn't respond, icsr=%b\n", unit, 230 addr->icsr, ACC_INBITS); 231 return (0); 232 } 233 234 /* 235 * Start output on an interface. 236 */ 237 accstart(dev) 238 dev_t dev; 239 { 240 int unit = ACCUNIT(dev), info; 241 register struct acc_softc *sc = &acc_softc[unit]; 242 register struct accdevice *addr; 243 struct mbuf *m; 244 u_short cmd; 245 246 COUNT(ACCSTART); 247 acctrace("start", sc->acc_ic->ic_oactive); 248 if (sc->acc_ic->ic_oactive) 249 goto restart; 250 251 /* 252 * Not already active, deqeue a request and 253 * map it onto the UNIBUS. If no more 254 * requeusts, just return. 255 */ 256 IF_DEQUEUE(&sc->acc_if->if_snd, m); 257 if (m == 0) { 258 acctrace("q empty", 0); 259 sc->acc_ic->ic_oactive = 0; 260 return; 261 } 262 sc->acc_olen = if_wubaput(&sc->acc_ifuba, m); 263 264 restart: 265 /* 266 * Have request mapped to UNIBUS for 267 * transmission; start the output. 268 */ 269 if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP) 270 UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp); 271 addr = (struct accdevice *)accinfo[unit]->ui_addr; 272 info = sc->acc_ifuba.ifu_w.ifrw_info; 273 addr->oba = (u_short)info; 274 addr->owc = -((sc->acc_olen + 1) >> 1); 275 cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO; 276 #ifdef LOOPBACK 277 cmd |= OUT_BBACK; 278 #endif 279 addr->ocsr = cmd; 280 sc->acc_ic->ic_oactive = 1; 281 } 282 283 /* 284 * Output interrupt handler. 285 */ 286 accxint(unit) 287 { 288 register struct acc_softc *sc = &acc_softc[unit]; 289 register struct accdevice *addr; 290 291 COUNT(ACCXINT); 292 acctrace("xint", sc->acc_ic->ic_oactive); 293 addr = (struct accdevice *)accinfo[unit]->ui_addr; 294 if (sc->acc_ic->ic_oactive == 0) { 295 printf("acc%d: stray xmit interrupt, csr=%b\n", unit, 296 addr->ocsr, ACC_OUTBITS); 297 addr->ocsr = ACC_RESET; 298 return; 299 } 300 acctrace("ocsr", addr->ocsr); 301 sc->acc_if->if_opackets++; 302 sc->acc_ic->ic_oactive = 0; 303 if (addr->ocsr & (ACC_ERR|OUT_TMR)) { 304 printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit, 305 addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS); 306 sc->acc_if->if_oerrors++; 307 } 308 if (sc->acc_ifuba.ifu_xtofree) { 309 m_freem(sc->acc_ifuba.ifu_xtofree); 310 sc->acc_ifuba.ifu_xtofree = 0; 311 } 312 if (sc->acc_if->if_snd.ifq_head) 313 accstart(unit); 314 } 315 316 /* 317 * Input interrupt handler 318 */ 319 accrint(unit) 320 { 321 register struct acc_softc *sc = &acc_softc[unit]; 322 register struct accdevice *addr; 323 struct mbuf *m; 324 int len, info; 325 326 COUNT(ACCRINT); 327 addr = (struct accdevice *)accinfo[unit]->ui_addr; 328 if ((addr->icsr & ACC_RDY) == 0) { 329 printf("acc%d: stray input interrupt\n", unit); 330 accinputreset(addr, unit); 331 goto setup; 332 } 333 sc->acc_if->if_ipackets++; 334 335 /* 336 * Purge BDP; flush message if error indicated. 337 */ 338 if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP) 339 UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp); 340 acctrace("rint", addr->icsr); 341 if (addr->icsr & (ACC_ERR|IN_RMR)) { 342 printf("acc%d: input error, icsr=%b, ocsr=%b\n", unit, 343 addr->icsr, ACC_INBITS, addr->ocsr, ACC_OUTBITS); 344 sc->acc_if->if_ierrors++; 345 if (addr->icsr & IN_RMR) 346 accinputreset(addr, unit); 347 sc->acc_flush = 1; 348 } 349 350 acctrace("flush", sc->acc_flush); 351 if (sc->acc_flush) { 352 if (addr->icsr & IN_EOM) 353 sc->acc_flush = 0; 354 goto setup; 355 } 356 len = IMPMTU + (addr->iwc << 1); 357 acctrace("length", len); 358 if (len < 0 || len > IMPMTU) { 359 printf("acc%d: bad length=%d\n", len); 360 sc->acc_if->if_ierrors++; 361 goto setup; 362 } 363 364 /* 365 * The last parameter is always 0 since using 366 * trailers on the ARPAnet is insane. 367 */ 368 m = if_rubaget(&sc->acc_ifuba, len, 0); 369 if (m == 0) 370 goto setup; 371 if ((addr->icsr & IN_EOM) == 0) { 372 if (sc->acc_iq) 373 m_cat(sc->acc_iq, m); 374 else 375 sc->acc_iq = m; 376 goto setup; 377 } 378 if (sc->acc_iq) { 379 m_cat(sc->acc_iq, m); 380 m = sc->acc_iq; 381 sc->acc_iq = 0; 382 } 383 acctrace("impinput", 0); 384 impinput(unit, m); 385 386 setup: 387 /* 388 * Setup for next message. 389 */ 390 info = sc->acc_ifuba.ifu_r.ifrw_info; 391 addr->iba = (u_short)info; 392 addr->iwc = -(IMPMTU >> 1); 393 addr->icsr = 394 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 395 } 396 397 int accprintf = 0; 398 399 acctrace(cmd, value) 400 char *cmd; 401 int value; 402 { 403 register int i; 404 register char *p = (char *)&value; 405 406 if (accprintf) 407 printf("%s: %x", cmd, value); 408 do { 409 if (accdebugx >= NACCDEBUG) 410 accdebugx = 0; 411 accdebug[accdebugx++] = *cmd; 412 } while (*cmd++); 413 for (i = 0; i < sizeof (int); i++) { 414 if (accdebugx >= NACCDEBUG) 415 accdebugx = 0; 416 accdebug[accdebugx++] = *p++; 417 } 418 } 419 #endif 420