1 /* if_acc.c 4.20 82/10/09 */ 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/if.h" 23 #include "../vaxif/if_acc.h" 24 #include "../netimp/if_imp.h" 25 #include "../vaxif/if_uba.h" 26 27 int accprobe(), accattach(), accrint(), accxint(); 28 struct uba_device *accinfo[NACC]; 29 u_short accstd[] = { 0 }; 30 struct uba_driver accdriver = 31 { accprobe, 0, accattach, 0, accstd, "acc", accinfo }; 32 #define ACCUNIT(x) minor(x) 33 34 int accinit(), accstart(), accreset(); 35 36 /* 37 * "Lower half" of IMP interface driver. 38 * 39 * Each IMP interface is handled by a common module which handles 40 * the IMP-host protocol and a hardware driver which manages the 41 * hardware specific details of talking with the IMP. 42 * 43 * The hardware portion of the IMP driver handles DMA and related 44 * management of UNIBUS resources. The IMP protocol module interprets 45 * contents of these messages and "controls" the actions of the 46 * hardware module during IMP resets, but not, for instance, during 47 * UNIBUS resets. 48 * 49 * The two modules are coupled at "attach time", and ever after, 50 * through the imp interface structure. Higher level protocols, 51 * e.g. IP, interact with the IMP driver, rather than the ACC. 52 */ 53 struct acc_softc { 54 struct ifnet *acc_if; /* pointer to IMP's ifnet struct */ 55 struct impcb *acc_ic; /* data structure shared with IMP */ 56 struct ifuba acc_ifuba; /* UNIBUS resources */ 57 struct mbuf *acc_iq; /* input reassembly queue */ 58 short acc_olen; /* size of last message sent */ 59 char acc_flush; /* flush remainder of message */ 60 } acc_softc[NACC]; 61 62 /* 63 * Reset the IMP and cause a transmitter interrupt by 64 * performing a null DMA. 65 */ 66 accprobe(reg) 67 caddr_t reg; 68 { 69 register int br, cvec; /* r11, r10 value-result */ 70 register struct accdevice *addr = (struct accdevice *)reg; 71 72 #ifdef lint 73 br = 0; cvec = br; br = cvec; 74 accrint(0); accxint(0); 75 #endif 76 addr->icsr = ACC_RESET; DELAY(5000); 77 addr->ocsr = ACC_RESET; DELAY(5000); 78 addr->ocsr = OUT_BBACK; DELAY(5000); 79 addr->owc = 0; 80 addr->ocsr = ACC_IE | ACC_GO; DELAY(5000); 81 addr->ocsr = 0; 82 if (cvec && cvec != 0x200) /* transmit -> receive */ 83 cvec -= 4; 84 #ifdef ECHACK 85 br = 0x16; 86 #endif 87 return (1); 88 } 89 90 /* 91 * Call the IMP module to allow it to set up its internal 92 * state, then tie the two modules together by setting up 93 * the back pointers to common data structures. 94 */ 95 accattach(ui) 96 struct uba_device *ui; 97 { 98 register struct acc_softc *sc = &acc_softc[ui->ui_unit]; 99 register struct impcb *ip; 100 struct ifimpcb { 101 struct ifnet ifimp_if; 102 struct impcb ifimp_impcb; 103 } *ifimp; 104 105 if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0) 106 panic("accattach"); 107 sc->acc_if = &ifimp->ifimp_if; 108 ip = &ifimp->ifimp_impcb; 109 sc->acc_ic = ip; 110 ip->ic_init = accinit; 111 ip->ic_start = accstart; 112 sc->acc_ifuba.ifu_flags = UBA_CANTWAIT; 113 #ifdef notdef 114 sc->acc_ifuba.ifu_flags |= UBA_NEEDBDP; 115 #endif 116 } 117 118 /* 119 * Reset interface after UNIBUS reset. 120 * If interface is on specified uba, reset its state. 121 */ 122 accreset(unit, uban) 123 int unit, uban; 124 { 125 register struct uba_device *ui; 126 struct acc_softc *sc; 127 128 if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 || 129 ui->ui_ubanum != uban) 130 return; 131 printf(" acc%d", unit); 132 sc = &acc_softc[unit]; 133 /* must go through IMP to allow it to set state */ 134 (*sc->acc_if->if_init)(unit); 135 } 136 137 /* 138 * Initialize interface: clear recorded pending operations, 139 * and retrieve, and initialize UNIBUS resources. Note 140 * return value is used by IMP init routine to mark IMP 141 * unavailable for outgoing traffic. 142 */ 143 accinit(unit) 144 int unit; 145 { 146 register struct acc_softc *sc; 147 register struct uba_device *ui; 148 register struct accdevice *addr; 149 int info, i; 150 151 if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) { 152 printf("acc%d: not alive\n", unit); 153 return (0); 154 } 155 sc = &acc_softc[unit]; 156 /* 157 * Header length is 0 since we have to passs 158 * the IMP leader up to the protocol interpretation 159 * routines. If we had the header length as 160 * sizeof(struct imp_leader), then the if_ routines 161 * would asssume we handle it on input and output. 162 */ 163 if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0, 164 (int)btoc(IMPMTU)) == 0) { 165 printf("acc%d: can't initialize\n", unit); 166 ui->ui_alive = 0; 167 return (0); 168 } 169 addr = (struct accdevice *)ui->ui_addr; 170 171 /* 172 * Reset the imp interface; 173 * the delays are pure guesswork. 174 */ 175 addr->ocsr = ACC_RESET; DELAY(5000); 176 addr->ocsr = OUT_BBACK; DELAY(5000); /* reset host master ready */ 177 addr->ocsr = 0; 178 if (accinputreset(addr, unit) == 0) { 179 ui->ui_alive = 0; 180 return (0); 181 } 182 183 /* 184 * Put up a read. We can't restart any outstanding writes 185 * until we're back in synch with the IMP (i.e. we've flushed 186 * the NOOPs it throws at us). 187 * Note: IMPMTU includes the leader. 188 */ 189 info = sc->acc_ifuba.ifu_r.ifrw_info; 190 addr->iba = (u_short)info; 191 addr->iwc = -(IMPMTU >> 1); 192 #ifdef LOOPBACK 193 addr->ocsr |= OUT_BBACK; 194 #endif 195 addr->icsr = 196 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 197 return (1); 198 } 199 200 accinputreset(addr, unit) 201 register struct accdevice *addr; 202 register int unit; 203 { 204 register int i; 205 206 addr->icsr = ACC_RESET; DELAY(5000); 207 addr->icsr = IN_MRDY | IN_WEN; /* close the relay */ 208 DELAY(10000); 209 /* YECH!!! */ 210 for (i = 0; i < 500; i++) { 211 if ((addr->icsr & IN_HRDY) || 212 (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0) 213 return (1); 214 addr->icsr = IN_MRDY | IN_WEN; DELAY(10000); 215 /* keep turning IN_RMR off */ 216 } 217 printf("acc%d: imp doesn't respond, icsr=%b\n", unit, 218 addr->icsr, ACC_INBITS); 219 return (0); 220 } 221 222 /* 223 * Start output on an interface. 224 */ 225 accstart(dev) 226 dev_t dev; 227 { 228 int unit = ACCUNIT(dev), info; 229 register struct acc_softc *sc = &acc_softc[unit]; 230 register struct accdevice *addr; 231 struct mbuf *m; 232 u_short cmd; 233 234 if (sc->acc_ic->ic_oactive) 235 goto restart; 236 237 /* 238 * Not already active, deqeue a request and 239 * map it onto the UNIBUS. If no more 240 * requeusts, just return. 241 */ 242 IF_DEQUEUE(&sc->acc_if->if_snd, m); 243 if (m == 0) { 244 sc->acc_ic->ic_oactive = 0; 245 return; 246 } 247 sc->acc_olen = if_wubaput(&sc->acc_ifuba, m); 248 249 restart: 250 /* 251 * Have request mapped to UNIBUS for 252 * transmission; start the output. 253 */ 254 if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP) 255 UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp); 256 addr = (struct accdevice *)accinfo[unit]->ui_addr; 257 info = sc->acc_ifuba.ifu_w.ifrw_info; 258 addr->oba = (u_short)info; 259 addr->owc = -((sc->acc_olen + 1) >> 1); 260 cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO; 261 #ifdef LOOPBACK 262 cmd |= OUT_BBACK; 263 #endif 264 addr->ocsr = cmd; 265 sc->acc_ic->ic_oactive = 1; 266 } 267 268 /* 269 * Output interrupt handler. 270 */ 271 accxint(unit) 272 int unit; 273 { 274 register struct acc_softc *sc = &acc_softc[unit]; 275 register struct accdevice *addr; 276 277 addr = (struct accdevice *)accinfo[unit]->ui_addr; 278 if (sc->acc_ic->ic_oactive == 0) { 279 printf("acc%d: stray xmit interrupt, csr=%b\n", unit, 280 addr->ocsr, ACC_OUTBITS); 281 return; 282 } 283 sc->acc_if->if_opackets++; 284 sc->acc_ic->ic_oactive = 0; 285 if (addr->ocsr & ACC_ERR) { 286 printf("acc%d: output error, ocsr=%b, icsr=%b\n", unit, 287 addr->ocsr, ACC_OUTBITS, addr->icsr, ACC_INBITS); 288 sc->acc_if->if_oerrors++; 289 } 290 if (sc->acc_ifuba.ifu_xtofree) { 291 m_freem(sc->acc_ifuba.ifu_xtofree); 292 sc->acc_ifuba.ifu_xtofree = 0; 293 } 294 if (sc->acc_if->if_snd.ifq_head) 295 accstart(unit); 296 } 297 298 /* 299 * Input interrupt handler 300 */ 301 accrint(unit) 302 int unit; 303 { 304 register struct acc_softc *sc = &acc_softc[unit]; 305 register struct accdevice *addr; 306 struct mbuf *m; 307 int len, info; 308 309 addr = (struct accdevice *)accinfo[unit]->ui_addr; 310 sc->acc_if->if_ipackets++; 311 312 /* 313 * Purge BDP; flush message if error indicated. 314 */ 315 if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP) 316 UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp); 317 if (addr->icsr & ACC_ERR) { 318 printf("acc%d: input error, csr=%b\n", unit, 319 addr->icsr, ACC_INBITS); 320 sc->acc_if->if_ierrors++; 321 sc->acc_flush = 1; 322 } 323 324 if (sc->acc_flush) { 325 if (addr->icsr & IN_EOM) 326 sc->acc_flush = 0; 327 goto setup; 328 } 329 len = IMPMTU + (addr->iwc << 1); 330 if (len < 0 || len > IMPMTU) { 331 printf("acc%d: bad length=%d\n", len); 332 sc->acc_if->if_ierrors++; 333 goto setup; 334 } 335 336 /* 337 * The last parameter is always 0 since using 338 * trailers on the ARPAnet is insane. 339 */ 340 m = if_rubaget(&sc->acc_ifuba, len, 0); 341 if (m == 0) 342 goto setup; 343 if ((addr->icsr & IN_EOM) == 0) { 344 if (sc->acc_iq) 345 m_cat(sc->acc_iq, m); 346 else 347 sc->acc_iq = m; 348 goto setup; 349 } 350 if (sc->acc_iq) { 351 m_cat(sc->acc_iq, m); 352 m = sc->acc_iq; 353 sc->acc_iq = 0; 354 } 355 impinput(unit, m); 356 357 setup: 358 /* 359 * Setup for next message. 360 */ 361 info = sc->acc_ifuba.ifu_r.ifrw_info; 362 addr->iba = (u_short)info; 363 addr->iwc = -(IMPMTU >> 1); 364 addr->icsr = 365 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 366 } 367 #endif 368