1 /* if_acc.c 4.4 82/02/16 */ 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 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 COUNT(ACCATTACH); 106 if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0) 107 panic("accattach"); 108 sc->acc_if = &ifimp->ifimp_if; 109 ip = &ifimp->ifimp_impcb; 110 sc->acc_ic = ip; 111 ip->ic_init = accinit; 112 ip->ic_start = accstart; 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 COUNT(ACCRESET); 129 if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0 || 130 ui->ui_ubanum != uban) 131 return; 132 printf(" acc%d", unit); 133 sc = &acc_softc[unit]; 134 /* must go through IMP to allow it to set state */ 135 (*sc->acc_if->if_init)(unit); 136 } 137 138 /* 139 * Initialize interface: clear recorded pending operations, 140 * and retrieve, and initialize UNIBUS resources. Note 141 * return value is used by IMP init routine to mark IMP 142 * unavailable for outgoing traffic. 143 */ 144 accinit(unit) 145 int unit; 146 { 147 register struct acc_softc *sc; 148 register struct uba_device *ui; 149 register struct accdevice *addr; 150 int x, info; 151 152 COUNT(ACCINIT); 153 if (unit >= NACC || (ui = accinfo[unit]) == 0 || ui->ui_alive == 0) { 154 printf("acc%d: not alive\n", unit); 155 return (0); 156 } 157 sc = &acc_softc[unit]; 158 /* 159 * Header length is 0 since we have to passs 160 * the IMP leader up to the protocol interpretation 161 * routines. If we had the header length as 162 * sizeof(struct imp_leader), then the if_ routines 163 * would asssume we handle it on input and output. 164 */ 165 if (if_ubainit(&sc->acc_ifuba, ui->ui_ubanum, 0, btoc(IMP_MTU)) == 0) { 166 printf("acc%d: can't initialize\n", unit); 167 goto down; 168 } 169 addr = (struct accdevice *)ui->ui_addr; 170 171 /* 172 * Reset the imp interface; 173 * the delays are pure guesswork. 174 */ 175 x = spl5(); 176 addr->icsr = ACC_RESET; DELAY(5000); 177 addr->ocsr = ACC_RESET; DELAY(5000); 178 addr->ocsr = OUT_BBACK; DELAY(1000); /* reset host master ready */ 179 addr->ocsr = 0; 180 splx(x); 181 addr->icsr = IN_MRDY; /* close the relay */ 182 183 /* YECH!!! */ 184 x = 500; 185 while (x-- > 0) { 186 if ((addr->icsr & IN_HRDY) || 187 (addr->icsr & (IN_RMR | IN_IMPBSY) == 0)) 188 break; 189 addr->icsr = IN_MRDY; DELAY(5000); /* keep turning IN_RMR off */ 190 } 191 if (x <= 0) { 192 printf("acc%d: imp doesn't respond, icsr=%b\n", unit, 193 addr->icsr, ACC_INBITS); 194 goto down; 195 } 196 197 /* 198 * Put up a read. We can't restart any outstanding writes 199 * until we're back in synch with the IMP (i.e. we've flushed 200 * the NOOPs it throws at us). 201 * Note: IMP_MTU includes the leader. 202 */ 203 x = spl5(); 204 info = sc->acc_ifuba.ifu_r.ifrw_info; 205 addr->iba = (u_short)info; 206 addr->iwc = -(IMP_MTU >> 1); 207 #ifdef LOOPBACK 208 addr->ocsr |= OUT_BBACK; 209 #endif 210 addr->icsr = 211 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 212 splx(x); 213 return (1); 214 down: 215 ui->ui_alive = 0; 216 return (0); 217 } 218 219 /* 220 * Start output on an interface. 221 */ 222 accstart(dev) 223 dev_t dev; 224 { 225 int unit = ACCUNIT(dev), info; 226 struct uba_device *ui = accinfo[unit]; 227 register struct acc_softc *sc = &acc_softc[unit]; 228 register struct accdevice *addr; 229 struct mbuf *m; 230 struct imp_leader *ip; 231 u_short cmd; 232 233 COUNT(ACCSTART); 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 *)ui->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 { 273 register struct uba_device *ui = accinfo[unit]; 274 register struct acc_softc *sc = &acc_softc[unit]; 275 register struct accdevice *addr; 276 277 COUNT(ACCXINT); 278 if (sc->acc_ic->ic_oactive == 0) { 279 printf("acc%d: stray xmit interrupt\n", unit); 280 return; 281 } 282 addr = (struct accdevice *)ui->ui_addr; 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, csr=%b\n", unit, 287 addr->ocsr, ACC_OUTBITS); 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 { 303 register struct acc_softc *sc = &acc_softc[unit]; 304 register struct accdevice *addr; 305 register struct ifqueue *inq; 306 struct mbuf *m; 307 int len, info; 308 309 COUNT(ACCRINT); 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 addr = (struct accdevice *)accinfo[unit]->ui_addr; 318 if (addr->icsr & ACC_ERR) { 319 printf("acc%d: input error, csr=%b\n", unit, 320 addr->icsr, ACC_INBITS); 321 sc->acc_if->if_ierrors++; 322 sc->acc_flush = 1; 323 } 324 325 if (sc->acc_flush) { 326 if (addr->icsr & IN_EOM) 327 sc->acc_flush = 0; 328 goto setup; 329 } 330 len = IMP_MTU + (addr->iwc << 1); 331 if (len < 0 || len > IMP_MTU) { 332 printf("acc%d: bad length=%d\n", len); 333 sc->acc_if->if_ierrors++; 334 goto setup; 335 } 336 337 /* 338 * The last parameter is always 0 since using 339 * trailers on the ARPAnet is insane. 340 */ 341 m = if_rubaget(&sc->acc_ifuba, len, 0); 342 if (m == 0) 343 goto setup; 344 if ((addr->icsr & IN_EOM) == 0) { 345 if (sc->acc_iq) 346 m_cat(sc->acc_iq, m); 347 else 348 sc->acc_iq = m; 349 goto setup; 350 } 351 /* adjust message length for padding. */ 352 #ifdef notdef 353 m->m_len -= 2; 354 #endif 355 if (sc->acc_iq) { 356 m_cat(sc->acc_iq, m); 357 m = sc->acc_iq; 358 sc->acc_iq = 0; 359 } 360 impinput(unit, m); 361 362 setup: 363 /* 364 * Setup for next message. 365 */ 366 info = sc->acc_ifuba.ifu_r.ifrw_info; 367 addr->iba = (u_short)info; 368 addr->iwc = -(IMP_MTU >> 1); 369 addr->icsr = 370 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 371 } 372 #endif 373