1 /* if_acc.c 4.15 82/04/20 */ 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 #ifdef notdef 117 sc->acc_ifuba.ifu_flags = UBA_NEEDBDP | UBA_CANTWAIT; 118 #endif 119 } 120 121 /* 122 * Reset interface after UNIBUS reset. 123 * If interface is on specified uba, reset its state. 124 */ 125 accreset(unit, uban) 126 int unit, uban; 127 { 128 register struct uba_device *ui; 129 struct acc_softc *sc; 130 131 COUNT(ACCRESET); 132 if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 || 133 ui->ui_ubanum != uban) 134 return; 135 printf(" acc%d", unit); 136 sc = &acc_softc[unit]; 137 /* must go through IMP to allow it to set state */ 138 (*sc->acc_if->if_init)(unit); 139 } 140 141 /* 142 * Initialize interface: clear recorded pending operations, 143 * and retrieve, and initialize UNIBUS resources. Note 144 * return value is used by IMP init routine to mark IMP 145 * unavailable for outgoing traffic. 146 */ 147 accinit(unit) 148 int unit; 149 { 150 register struct acc_softc *sc; 151 register struct uba_device *ui; 152 register struct accdevice *addr; 153 int info, i; 154 155 COUNT(ACCINIT); 156 if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) { 157 printf("acc%d: not alive\n", unit); 158 return (0); 159 } 160 sc = &acc_softc[unit]; 161 /* 162 * Header length is 0 since we have to passs 163 * the IMP leader up to the protocol interpretation 164 * routines. If we had the header length as 165 * sizeof(struct imp_leader), then the if_ routines 166 * would asssume we handle it on input and output. 167 */ 168 if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0, 169 (int)btoc(IMPMTU)) == 0) { 170 printf("acc%d: can't initialize\n", unit); 171 goto down; 172 } 173 addr = (struct accdevice *)ui->ui_addr; 174 175 /* 176 * Reset the imp interface; 177 * the delays are pure guesswork. 178 */ 179 addr->icsr = ACC_RESET; DELAY(5000); 180 addr->ocsr = ACC_RESET; DELAY(5000); 181 addr->ocsr = OUT_BBACK; DELAY(5000); /* reset host master ready */ 182 addr->ocsr = 0; 183 addr->icsr = IN_MRDY | IN_WEN; /* close the relay */ 184 DELAY(10000); 185 /* YECH!!! */ 186 for (i = 0; i < 500; i++) { 187 if ((addr->icsr & IN_HRDY) || 188 (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0) 189 goto ok; 190 addr->icsr = IN_MRDY | IN_WEN; DELAY(10000); 191 /* keep turning IN_RMR off */ 192 } 193 printf("acc%d: imp doesn't respond, icsr=%b\n", unit, 194 addr->icsr, ACC_INBITS); 195 down: 196 ui->ui_alive = 0; 197 return (0); 198 199 ok: 200 /* 201 * Put up a read. We can't restart any outstanding writes 202 * until we're back in synch with the IMP (i.e. we've flushed 203 * the NOOPs it throws at us). 204 * Note: IMPMTU includes the leader. 205 */ 206 info = sc->acc_ifuba.ifu_r.ifrw_info; 207 addr->iba = (u_short)info; 208 addr->iwc = -(IMPMTU >> 1); 209 #ifdef LOOPBACK 210 addr->ocsr |= OUT_BBACK; 211 #endif 212 addr->icsr = 213 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 214 return (1); 215 } 216 217 /* 218 * Start output on an interface. 219 */ 220 accstart(dev) 221 dev_t dev; 222 { 223 int unit = ACCUNIT(dev), info; 224 register struct acc_softc *sc = &acc_softc[unit]; 225 register struct accdevice *addr; 226 struct mbuf *m; 227 u_short cmd; 228 229 COUNT(ACCSTART); 230 if (sc->acc_ic->ic_oactive) 231 goto restart; 232 233 /* 234 * Not already active, deqeue a request and 235 * map it onto the UNIBUS. If no more 236 * requeusts, just return. 237 */ 238 IF_DEQUEUE(&sc->acc_if->if_snd, m); 239 if (m == 0) { 240 sc->acc_ic->ic_oactive = 0; 241 return; 242 } 243 sc->acc_olen = if_wubaput(&sc->acc_ifuba, m); 244 245 restart: 246 /* 247 * Have request mapped to UNIBUS for 248 * transmission; start the output. 249 */ 250 if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP) 251 UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_w.ifrw_bdp); 252 addr = (struct accdevice *)accinfo[unit]->ui_addr; 253 info = sc->acc_ifuba.ifu_w.ifrw_info; 254 addr->oba = (u_short)info; 255 addr->owc = -((sc->acc_olen + 1) >> 1); 256 cmd = ACC_IE | OUT_ENLB | ((info & 0x30000) >> 12) | ACC_GO; 257 #ifdef LOOPBACK 258 cmd |= OUT_BBACK; 259 #endif 260 addr->ocsr = cmd; 261 sc->acc_ic->ic_oactive = 1; 262 } 263 264 /* 265 * Output interrupt handler. 266 */ 267 accxint(unit) 268 { 269 register struct acc_softc *sc = &acc_softc[unit]; 270 register struct accdevice *addr; 271 272 COUNT(ACCXINT); 273 if (sc->acc_ic->ic_oactive == 0) { 274 printf("acc%d: stray xmit interrupt\n", unit); 275 return; 276 } 277 addr = (struct accdevice *)accinfo[unit]->ui_addr; 278 sc->acc_if->if_opackets++; 279 sc->acc_ic->ic_oactive = 0; 280 if (addr->ocsr & ACC_ERR) { 281 printf("acc%d: output error, csr=%b\n", unit, 282 addr->ocsr, ACC_OUTBITS); 283 sc->acc_if->if_oerrors++; 284 } 285 if (sc->acc_ifuba.ifu_xtofree) { 286 m_freem(sc->acc_ifuba.ifu_xtofree); 287 sc->acc_ifuba.ifu_xtofree = 0; 288 } 289 if (sc->acc_if->if_snd.ifq_head) 290 accstart(unit); 291 } 292 293 /* 294 * Input interrupt handler 295 */ 296 accrint(unit) 297 { 298 register struct acc_softc *sc = &acc_softc[unit]; 299 register struct accdevice *addr; 300 struct mbuf *m; 301 int len, info; 302 303 COUNT(ACCRINT); 304 sc->acc_if->if_ipackets++; 305 306 /* 307 * Purge BDP; flush message if error indicated. 308 */ 309 if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP) 310 UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp); 311 addr = (struct accdevice *)accinfo[unit]->ui_addr; 312 if (addr->icsr & ACC_ERR) { 313 printf("acc%d: input error, csr=%b\n", unit, 314 addr->icsr, ACC_INBITS); 315 sc->acc_if->if_ierrors++; 316 sc->acc_flush = 1; 317 } 318 319 if (sc->acc_flush) { 320 if (addr->icsr & IN_EOM) 321 sc->acc_flush = 0; 322 goto setup; 323 } 324 len = IMPMTU + (addr->iwc << 1); 325 if (len < 0 || len > IMPMTU) { 326 printf("acc%d: bad length=%d\n", len); 327 sc->acc_if->if_ierrors++; 328 goto setup; 329 } 330 331 /* 332 * The last parameter is always 0 since using 333 * trailers on the ARPAnet is insane. 334 */ 335 m = if_rubaget(&sc->acc_ifuba, len, 0); 336 if (m == 0) 337 goto setup; 338 if ((addr->icsr & IN_EOM) == 0) { 339 if (sc->acc_iq) 340 m_cat(sc->acc_iq, m); 341 else 342 sc->acc_iq = m; 343 goto setup; 344 } 345 if (sc->acc_iq) { 346 m_cat(sc->acc_iq, m); 347 m = sc->acc_iq; 348 sc->acc_iq = 0; 349 } 350 impinput(unit, m); 351 352 setup: 353 /* 354 * Setup for next message. 355 */ 356 info = sc->acc_ifuba.ifu_r.ifrw_info; 357 addr->iba = (u_short)info; 358 addr->iwc = -(IMPMTU >> 1); 359 addr->icsr = 360 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 361 } 362 #endif 363