1 /* if_acc.c 4.33 83/01/03 */ 2 3 #include "acc.h" 4 #ifdef NACC > 0 5 6 /* 7 * ACC LH/DH ARPAnet IMP interface driver. 8 */ 9 #include "../machine/pte.h" 10 11 #include "../h/param.h" 12 #include "../h/systm.h" 13 #include "../h/mbuf.h" 14 #include "../h/buf.h" 15 #include "../h/protosw.h" 16 #include "../h/socket.h" 17 #include "../h/vmmac.h" 18 19 #include "../net/if.h" 20 #include "../netimp/if_imp.h" 21 22 #include "../vax/cpu.h" 23 #include "../vax/mtpr.h" 24 #include "../vaxif/if_accreg.h" 25 #include "../vaxif/if_uba.h" 26 #include "../vaxuba/ubareg.h" 27 #include "../vaxuba/ubavar.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 #ifdef lint 75 br = 0; cvec = br; br = cvec; 76 accrint(0); accxint(0); 77 #endif 78 addr->icsr = ACC_RESET; DELAY(5000); 79 addr->ocsr = ACC_RESET; DELAY(5000); 80 addr->ocsr = OUT_BBACK; DELAY(5000); 81 addr->owc = 0; 82 addr->ocsr = ACC_IE | ACC_GO; DELAY(5000); 83 addr->ocsr = 0; 84 if (cvec && cvec != 0x200) /* transmit -> receive */ 85 cvec -= 4; 86 return (1); 87 } 88 89 /* 90 * Call the IMP module to allow it to set up its internal 91 * state, then tie the two modules together by setting up 92 * the back pointers to common data structures. 93 */ 94 accattach(ui) 95 struct uba_device *ui; 96 { 97 register struct acc_softc *sc = &acc_softc[ui->ui_unit]; 98 register struct impcb *ip; 99 struct ifimpcb { 100 struct ifnet ifimp_if; 101 struct impcb ifimp_impcb; 102 } *ifimp; 103 104 if ((ifimp = (struct ifimpcb *)impattach(ui, accreset)) == 0) 105 panic("accattach"); 106 sc->acc_if = &ifimp->ifimp_if; 107 ip = &ifimp->ifimp_impcb; 108 sc->acc_ic = ip; 109 ip->ic_init = accinit; 110 ip->ic_start = accstart; 111 sc->acc_ifuba.ifu_flags = UBA_CANTWAIT; 112 #ifdef notdef 113 sc->acc_ifuba.ifu_flags |= UBA_NEEDBDP; 114 #endif 115 } 116 117 /* 118 * Reset interface after UNIBUS reset. 119 * If interface is on specified uba, reset its state. 120 */ 121 accreset(unit, uban) 122 int unit, uban; 123 { 124 register struct uba_device *ui; 125 struct acc_softc *sc; 126 127 if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 || 128 ui->ui_ubanum != uban) 129 return; 130 printf(" acc%d", unit); 131 sc = &acc_softc[unit]; 132 /* must go through IMP to allow it to set state */ 133 (*sc->acc_if->if_init)(unit); 134 } 135 136 /* 137 * Initialize interface: clear recorded pending operations, 138 * and retrieve, and initialize UNIBUS resources. Note 139 * return value is used by IMP init routine to mark IMP 140 * unavailable for outgoing traffic. 141 */ 142 accinit(unit) 143 int unit; 144 { 145 register struct acc_softc *sc; 146 register struct uba_device *ui; 147 register struct accdevice *addr; 148 int info; 149 150 if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) { 151 printf("acc%d: not alive\n", unit); 152 return (0); 153 } 154 sc = &acc_softc[unit]; 155 /* 156 * Header length is 0 since we have to passs 157 * the IMP leader up to the protocol interpretation 158 * routines. If we had the header length as 159 * sizeof(struct imp_leader), then the if_ routines 160 * would asssume we handle it on input and output. 161 */ 162 if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0, 163 (int)btoc(IMPMTU)) == 0) { 164 printf("acc%d: can't initialize\n", unit); 165 ui->ui_alive = 0; 166 return (0); 167 } 168 addr = (struct accdevice *)ui->ui_addr; 169 170 /* 171 * Reset the imp interface; 172 * the delays are pure guesswork. 173 */ 174 addr->ocsr = ACC_RESET; DELAY(5000); 175 addr->ocsr = OUT_BBACK; DELAY(5000); /* reset host master ready */ 176 addr->ocsr = 0; 177 if (accinputreset(addr, unit) == 0) { 178 ui->ui_alive = 0; 179 return (0); 180 } 181 182 /* 183 * Put up a read. We can't restart any outstanding writes 184 * until we're back in synch with the IMP (i.e. we've flushed 185 * the NOOPs it throws at us). 186 * Note: IMPMTU includes the leader. 187 */ 188 info = sc->acc_ifuba.ifu_r.ifrw_info; 189 addr->iba = (u_short)info; 190 addr->iwc = -(IMPMTU >> 1); 191 #ifdef LOOPBACK 192 addr->ocsr |= OUT_BBACK; 193 #endif 194 addr->icsr = 195 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 196 return (1); 197 } 198 199 accinputreset(addr, unit) 200 register struct accdevice *addr; 201 register int unit; 202 { 203 register int i; 204 205 addr->icsr = ACC_RESET; DELAY(5000); 206 addr->icsr = IN_MRDY | IN_WEN; /* close the relay */ 207 DELAY(10000); 208 /* YECH!!! */ 209 for (i = 0; i < 500; i++) { 210 if ((addr->icsr & IN_HRDY) || 211 (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0) 212 return (1); 213 addr->icsr = IN_MRDY | IN_WEN; DELAY(10000); 214 /* keep turning IN_RMR off */ 215 } 216 printf("acc%d: imp doesn't respond, icsr=%b\n", unit, 217 addr->icsr, ACC_INBITS); 218 return (0); 219 } 220 221 /* 222 * Start output on an interface. 223 */ 224 accstart(dev) 225 dev_t dev; 226 { 227 int unit = ACCUNIT(dev), info; 228 register struct acc_softc *sc = &acc_softc[unit]; 229 register struct accdevice *addr; 230 struct mbuf *m; 231 u_short cmd; 232 233 if (sc->acc_ic->ic_oactive) 234 goto restart; 235 236 /* 237 * Not already active, deqeue a request and 238 * map it onto the UNIBUS. If no more 239 * requeusts, just return. 240 */ 241 IF_DEQUEUE(&sc->acc_if->if_snd, m); 242 if (m == 0) { 243 sc->acc_ic->ic_oactive = 0; 244 return; 245 } 246 sc->acc_olen = if_wubaput(&sc->acc_ifuba, m); 247 248 restart: 249 /* 250 * Have request mapped to UNIBUS for 251 * transmission; start the output. 252 */ 253 if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP) 254 UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp); 255 addr = (struct accdevice *)accinfo[unit]->ui_addr; 256 info = sc->acc_ifuba.ifu_w.ifrw_info; 257 addr->oba = (u_short)info; 258 addr->owc = -((sc->acc_olen + 1) >> 1); 259 cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO; 260 #ifdef LOOPBACK 261 cmd |= OUT_BBACK; 262 #endif 263 addr->ocsr = cmd; 264 sc->acc_ic->ic_oactive = 1; 265 } 266 267 /* 268 * Output interrupt handler. 269 */ 270 accxint(unit) 271 int unit; 272 { 273 register struct acc_softc *sc = &acc_softc[unit]; 274 register struct accdevice *addr; 275 276 addr = (struct accdevice *)accinfo[unit]->ui_addr; 277 if (sc->acc_ic->ic_oactive == 0) { 278 printf("acc%d: stray xmit interrupt, csr=%b\n", unit, 279 addr->ocsr, ACC_OUTBITS); 280 return; 281 } 282 sc->acc_if->if_opackets++; 283 sc->acc_ic->ic_oactive = 0; 284 if (addr->ocsr & ACC_ERR) { 285 printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit, 286 addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS); 287 sc->acc_if->if_oerrors++; 288 } 289 if (sc->acc_ifuba.ifu_xtofree) { 290 m_freem(sc->acc_ifuba.ifu_xtofree); 291 sc->acc_ifuba.ifu_xtofree = 0; 292 } 293 if (sc->acc_if->if_snd.ifq_head) 294 accstart(unit); 295 } 296 297 /* 298 * Input interrupt handler 299 */ 300 accrint(unit) 301 int unit; 302 { 303 register struct acc_softc *sc = &acc_softc[unit]; 304 register struct accdevice *addr; 305 struct mbuf *m; 306 int len, info; 307 308 addr = (struct accdevice *)accinfo[unit]->ui_addr; 309 sc->acc_if->if_ipackets++; 310 311 /* 312 * Purge BDP; flush message if error indicated. 313 */ 314 if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP) 315 UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp); 316 if (addr->icsr & ACC_ERR) { 317 printf("acc%d: input error, csr=%b\n", unit, 318 addr->icsr, ACC_INBITS); 319 sc->acc_if->if_ierrors++; 320 sc->acc_flush = 1; 321 } 322 323 if (sc->acc_flush) { 324 if (addr->icsr & IN_EOM) 325 sc->acc_flush = 0; 326 goto setup; 327 } 328 len = IMPMTU + (addr->iwc << 1); 329 if (len < 0 || len > IMPMTU) { 330 printf("acc%d: bad length=%d\n", len); 331 sc->acc_if->if_ierrors++; 332 goto setup; 333 } 334 335 /* 336 * The last parameter is always 0 since using 337 * trailers on the ARPAnet is insane. 338 */ 339 m = if_rubaget(&sc->acc_ifuba, len, 0); 340 if (m == 0) 341 goto setup; 342 if ((addr->icsr & IN_EOM) == 0) { 343 if (sc->acc_iq) 344 m_cat(sc->acc_iq, m); 345 else 346 sc->acc_iq = m; 347 goto setup; 348 } 349 if (sc->acc_iq) { 350 m_cat(sc->acc_iq, m); 351 m = sc->acc_iq; 352 sc->acc_iq = 0; 353 } 354 impinput(unit, m); 355 356 setup: 357 /* 358 * Setup for next message. 359 */ 360 info = sc->acc_ifuba.ifu_r.ifrw_info; 361 addr->iba = (u_short)info; 362 addr->iwc = -(IMPMTU >> 1); 363 addr->icsr = 364 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 365 } 366 #endif 367