1 /* if_acc.c 4.9 82/03/13 */ 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, 166 (int)btoc(IMP_MTU)) == 0) { 167 printf("acc%d: can't initialize\n", unit); 168 goto down; 169 } 170 addr = (struct accdevice *)ui->ui_addr; 171 172 /* 173 * Reset the imp interface; 174 * the delays are pure guesswork. 175 */ 176 x = spl5(); 177 addr->icsr = ACC_RESET; DELAY(5000); 178 addr->ocsr = ACC_RESET; DELAY(5000); 179 addr->ocsr = OUT_BBACK; DELAY(1000); /* reset host master ready */ 180 addr->ocsr = 0; 181 splx(x); 182 addr->icsr = IN_MRDY | IN_WEN; /* close the relay */ 183 DELAY(5000); 184 /* YECH!!! */ 185 x = 500; 186 while (x-- > 0) { 187 if ((addr->icsr & IN_HRDY) || 188 (addr->icsr & (IN_RMR | IN_IMPBSY)) == 0) 189 break; 190 addr->icsr = IN_MRDY | IN_WEN; 191 DELAY(5000); /* keep turning IN_RMR off */ 192 } 193 if (x <= 0) { 194 printf("acc%d: imp doesn't respond, icsr=%b\n", unit, 195 addr->icsr, ACC_INBITS); 196 goto down; 197 } 198 199 /* 200 * Put up a read. We can't restart any outstanding writes 201 * until we're back in synch with the IMP (i.e. we've flushed 202 * the NOOPs it throws at us). 203 * Note: IMP_MTU includes the leader. 204 */ 205 x = spl5(); 206 info = sc->acc_ifuba.ifu_r.ifrw_info; 207 addr->iba = (u_short)info; 208 addr->iwc = -(IMP_MTU >> 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 splx(x); 215 return (1); 216 down: 217 ui->ui_alive = 0; 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 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 *)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 { 273 register struct acc_softc *sc = &acc_softc[unit]; 274 register struct accdevice *addr; 275 276 COUNT(ACCXINT); 277 if (sc->acc_ic->ic_oactive == 0) { 278 printf("acc%d: stray xmit interrupt\n", unit); 279 return; 280 } 281 addr = (struct accdevice *)accinfo[unit]->ui_addr; 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, csr=%b\n", unit, 286 addr->ocsr, ACC_OUTBITS); 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 { 302 register struct acc_softc *sc = &acc_softc[unit]; 303 register struct accdevice *addr; 304 struct mbuf *m; 305 int len, info; 306 307 COUNT(ACCRINT); 308 sc->acc_if->if_ipackets++; 309 310 /* 311 * Purge BDP; flush message if error indicated. 312 */ 313 if (sc->acc_ifuba.ifu_flags & UBA_NEEDBDP) 314 UBAPURGE(sc->acc_ifuba.ifu_uba, sc->acc_ifuba.ifu_r.ifrw_bdp); 315 addr = (struct accdevice *)accinfo[unit]->ui_addr; 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 = IMP_MTU + (addr->iwc << 1); 329 if (len < 0 || len > IMP_MTU) { 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 = -(IMP_MTU >> 1); 363 addr->icsr = 364 IN_MRDY | ACC_IE | IN_WEN | ((info & 0x30000) >> 12) | ACC_GO; 365 } 366 #endif 367