1 /* if_acc.c 4.18 82/06/15 */ 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 /* 65 * Reset the IMP and cause a transmitter interrupt by 66 * performing a null DMA. 67 */ 68 accprobe(reg) 69 caddr_t reg; 70 { 71 register int br, cvec; /* r11, r10 value-result */ 72 register struct accdevice *addr = (struct accdevice *)reg; 73 74 COUNT(ACCPROBE); 75 #ifdef lint 76 br = 0; cvec = br; br = cvec; 77 accrint(0); accxint(0); 78 #endif 79 addr->icsr = ACC_RESET; DELAY(5000); 80 addr->ocsr = ACC_RESET; DELAY(5000); 81 addr->ocsr = OUT_BBACK; DELAY(5000); 82 addr->owc = 0; 83 addr->ocsr = ACC_IE | ACC_GO; DELAY(5000); 84 addr->ocsr = 0; 85 if (cvec && cvec != 0x200) /* transmit -> receive */ 86 cvec -= 4; 87 #ifdef ECHACK 88 br = 0x16; 89 #endif 90 return (1); 91 } 92 93 /* 94 * Call the IMP module to allow it to set up its internal 95 * state, then tie the two modules together by setting up 96 * the back pointers to common data structures. 97 */ 98 accattach(ui) 99 struct uba_device *ui; 100 { 101 register struct acc_softc *sc = &acc_softc[ui->ui_unit]; 102 register struct impcb *ip; 103 struct ifimpcb { 104 struct ifnet ifimp_if; 105 struct impcb ifimp_impcb; 106 } *ifimp; 107 108 COUNT(ACCATTACH); 109 if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0) 110 panic("accattach"); 111 sc->acc_if = &ifimp->ifimp_if; 112 ip = &ifimp->ifimp_impcb; 113 sc->acc_ic = ip; 114 ip->ic_init = accinit; 115 ip->ic_start = accstart; 116 sc->acc_ifuba.ifu_flags = UBA_CANTWAIT; 117 #ifdef notdef 118 sc->acc_ifuba.ifu_flags |= UBA_NEEDBDP; 119 #endif 120 } 121 122 /* 123 * Reset interface after UNIBUS reset. 124 * If interface is on specified uba, reset its state. 125 */ 126 accreset(unit, uban) 127 int unit, uban; 128 { 129 register struct uba_device *ui; 130 struct acc_softc *sc; 131 132 COUNT(ACCRESET); 133 if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 || 134 ui->ui_ubanum != uban) 135 return; 136 printf(" acc%d", unit); 137 sc = &acc_softc[unit]; 138 /* must go through IMP to allow it to set state */ 139 (*sc->acc_if->if_init)(unit); 140 } 141 142 /* 143 * Initialize interface: clear recorded pending operations, 144 * and retrieve, and initialize UNIBUS resources. Note 145 * return value is used by IMP init routine to mark IMP 146 * unavailable for outgoing traffic. 147 */ 148 accinit(unit) 149 int unit; 150 { 151 register struct acc_softc *sc; 152 register struct uba_device *ui; 153 register struct accdevice *addr; 154 int info, i; 155 156 COUNT(ACCINIT); 157 if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) { 158 printf("acc%d: not alive\n", unit); 159 return (0); 160 } 161 sc = &acc_softc[unit]; 162 /* 163 * Header length is 0 since we have to passs 164 * the IMP leader up to the protocol interpretation 165 * routines. If we had the header length as 166 * sizeof(struct imp_leader), then the if_ routines 167 * would asssume we handle it on input and output. 168 */ 169 if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0, 170 (int)btoc(IMPMTU)) == 0) { 171 printf("acc%d: can't initialize\n", unit); 172 ui->ui_alive = 0; 173 return (0); 174 } 175 addr = (struct accdevice *)ui->ui_addr; 176 177 /* 178 * Reset the imp interface; 179 * the delays are pure guesswork. 180 */ 181 addr->ocsr = ACC_RESET; DELAY(5000); 182 addr->ocsr = OUT_BBACK; DELAY(5000); /* reset host master ready */ 183 addr->ocsr = 0; 184 if (accinputreset(addr, unit) == 0) { 185 ui->ui_alive = 0; 186 return (0); 187 } 188 189 /* 190 * Put up a read. We can't restart any outstanding writes 191 * until we're back in synch with the IMP (i.e. we've flushed 192 * the NOOPs it throws at us). 193 * Note: IMPMTU includes the leader. 194 */ 195 info = sc->acc_ifuba.ifu_r.ifrw_info; 196 addr->iba = (u_short)info; 197 addr->iwc = -(IMPMTU >> 1); 198 #ifdef LOOPBACK 199 addr->ocsr |= OUT_BBACK; 200 #endif 201 addr->icsr = 202 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 203 return (1); 204 } 205 206 accinputreset(addr, unit) 207 register struct accdevice *addr; 208 register int unit; 209 { 210 register int i; 211 212 addr->icsr = ACC_RESET; DELAY(5000); 213 addr->icsr = IN_MRDY | IN_WEN; /* close the relay */ 214 DELAY(10000); 215 /* YECH!!! */ 216 for (i = 0; i < 500; i++) { 217 if ((addr->icsr & IN_HRDY) || 218 (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0) 219 return (1); 220 addr->icsr = IN_MRDY | IN_WEN; DELAY(10000); 221 /* keep turning IN_RMR off */ 222 } 223 printf("acc%d: imp doesn't respond, icsr=%b\n", unit, 224 addr->icsr, ACC_INBITS); 225 return (0); 226 } 227 228 /* 229 * Start output on an interface. 230 */ 231 accstart(dev) 232 dev_t dev; 233 { 234 int unit = ACCUNIT(dev), info; 235 register struct acc_softc *sc = &acc_softc[unit]; 236 register struct accdevice *addr; 237 struct mbuf *m; 238 u_short cmd; 239 240 COUNT(ACCSTART); 241 if (sc->acc_ic->ic_oactive) 242 goto restart; 243 244 /* 245 * Not already active, deqeue a request and 246 * map it onto the UNIBUS. If no more 247 * requeusts, just return. 248 */ 249 IF_DEQUEUE(&sc->acc_if->if_snd, m); 250 if (m == 0) { 251 sc->acc_ic->ic_oactive = 0; 252 return; 253 } 254 sc->acc_olen = if_wubaput(&sc->acc_ifuba, m); 255 256 restart: 257 /* 258 * Have request mapped to UNIBUS for 259 * transmission; start the output. 260 */ 261 if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP) 262 UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp); 263 addr = (struct accdevice *)accinfo[unit]->ui_addr; 264 info = sc->acc_ifuba.ifu_w.ifrw_info; 265 addr->oba = (u_short)info; 266 addr->owc = -((sc->acc_olen + 1) >> 1); 267 cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO; 268 #ifdef LOOPBACK 269 cmd |= OUT_BBACK; 270 #endif 271 addr->ocsr = cmd; 272 sc->acc_ic->ic_oactive = 1; 273 } 274 275 /* 276 * Output interrupt handler. 277 */ 278 accxint(unit) 279 { 280 register struct acc_softc *sc = &acc_softc[unit]; 281 register struct accdevice *addr; 282 283 COUNT(ACCXINT); 284 addr = (struct accdevice *)accinfo[unit]->ui_addr; 285 if (sc->acc_ic->ic_oactive == 0) { 286 printf("acc%d: stray xmit interrupt, csr=%b\n", unit, 287 addr->ocsr, ACC_OUTBITS); 288 return; 289 } 290 sc->acc_if->if_opackets++; 291 sc->acc_ic->ic_oactive = 0; 292 if (addr->ocsr & ACC_ERR) { 293 printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit, 294 addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS); 295 sc->acc_if->if_oerrors++; 296 } 297 if (sc->acc_ifuba.ifu_xtofree) { 298 m_freem(sc->acc_ifuba.ifu_xtofree); 299 sc->acc_ifuba.ifu_xtofree = 0; 300 } 301 if (sc->acc_if->if_snd.ifq_head) 302 accstart(unit); 303 } 304 305 /* 306 * Input interrupt handler 307 */ 308 accrint(unit) 309 { 310 register struct acc_softc *sc = &acc_softc[unit]; 311 register struct accdevice *addr; 312 struct mbuf *m; 313 int len, info; 314 315 COUNT(ACCRINT); 316 addr = (struct accdevice *)accinfo[unit]->ui_addr; 317 sc->acc_if->if_ipackets++; 318 319 /* 320 * Purge BDP; flush message if error indicated. 321 */ 322 if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP) 323 UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp); 324 if (addr->icsr & ACC_ERR) { 325 printf("acc%d: input error, csr=%b\n", unit, 326 addr->icsr, ACC_INBITS); 327 sc->acc_if->if_ierrors++; 328 sc->acc_flush = 1; 329 } 330 331 if (sc->acc_flush) { 332 if (addr->icsr & IN_EOM) 333 sc->acc_flush = 0; 334 goto setup; 335 } 336 len = IMPMTU + (addr->iwc << 1); 337 if (len < 0 || len > IMPMTU) { 338 printf("acc%d: bad length=%d\n", len); 339 sc->acc_if->if_ierrors++; 340 goto setup; 341 } 342 343 /* 344 * The last parameter is always 0 since using 345 * trailers on the ARPAnet is insane. 346 */ 347 m = if_rubaget(&sc->acc_ifuba, len, 0); 348 if (m == 0) 349 goto setup; 350 if ((addr->icsr & IN_EOM) == 0) { 351 if (sc->acc_iq) 352 m_cat(sc->acc_iq, m); 353 else 354 sc->acc_iq = m; 355 goto setup; 356 } 357 if (sc->acc_iq) { 358 m_cat(sc->acc_iq, m); 359 m = sc->acc_iq; 360 sc->acc_iq = 0; 361 } 362 impinput(unit, m); 363 364 setup: 365 /* 366 * Setup for next message. 367 */ 368 info = sc->acc_ifuba.ifu_r.ifrw_info; 369 addr->iba = (u_short)info; 370 addr->iwc = -(IMPMTU >> 1); 371 addr->icsr = 372 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 373 } 374 #endif 375