1 /* if_css.c 4.4 82/10/23 */ 2 3 #include "css.h" 4 5 /* 6 * DEC/CSS IMP11-A ARPAnet IMP interface driver. 7 * Since "imp11a" is such a mouthful, it is called 8 * "css" after the LH/DH being called "acc". 9 * 10 * Configuration notes: 11 * 12 * As delivered from DEC/CSS, it 13 * is addressed and vectored as two DR11-B's. This makes 14 * Autoconfig almost IMPOSSIBLE. To make it work, the 15 * interrupt vectors must be restrapped to make the vectors 16 * consecutive. The 020 hole between the CSR addresses is 17 * tolerated, althought that could be cleaned-up also. 18 * 19 * Additionally, the TRANSMIT side of the IMP11-A has the 20 * lower address of the two subunits, so the vector ordering 21 * in the CONFIG file is reversed from most other devices. 22 * It should be: 23 * 24 * device css0 .... cssxint cssrint 25 * 26 * If you get it wrong, it will still autoconfig, but will just 27 * sit there with RECIEVE IDLE indicated on the front panel. 28 */ 29 30 #include "../h/param.h" 31 #include "../h/systm.h" 32 #include "../h/mbuf.h" 33 #include "../h/pte.h" 34 #include "../h/buf.h" 35 #include "../h/protosw.h" 36 #include "../h/socket.h" 37 #include "../h/vmmac.h" 38 39 #include "../net/if.h" 40 #include "../netimp/if_imp.h" 41 42 #include "../vax/cpu.h" 43 #include "../vax/mtpr.h" 44 #include "../vaxif/if_css.h" 45 #include "../vaxif/if_uba.h" 46 #include "../vaxuba/ubareg.h" 47 #include "../vaxuba/ubavar.h" 48 49 int cssprobe(), cssattach(), cssrint(), cssxint(); 50 struct uba_device *cssinfo[NCSS]; 51 u_short cssstd[] = { 0 }; 52 struct uba_driver cssdriver = 53 { cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo }; 54 #define CSSUNIT(x) minor(x) 55 56 int cssinit(), cssstart(), cssreset(); 57 58 /* 59 * "Lower half" of IMP interface driver. 60 * 61 * Each IMP interface is handled by a common module which handles 62 * the IMP-host protocol and a hardware driver which manages the 63 * hardware specific details of talking with the IMP. 64 * 65 * The hardware portion of the IMP driver handles DMA and related 66 * management of UNIBUS resources. The IMP protocol module interprets 67 * contents of these messages and "controls" the actions of the 68 * hardware module during IMP resets, but not, for instance, during 69 * UNIBUS resets. 70 * 71 * The two modules are coupled at "attach time", and ever after, 72 * through the imp interface structure. Higher level protocols, 73 * e.g. IP, interact with the IMP driver, rather than the CSS. 74 */ 75 struct css_softc { 76 struct ifnet *css_if; /* pointer to IMP's ifnet struct */ 77 struct impcb *css_ic; /* data structure shared with IMP */ 78 struct ifuba css_ifuba; /* UNIBUS resources */ 79 struct mbuf *css_iq; /* input reassembly queue */ 80 short css_olen; /* size of last message sent */ 81 char css_flush; /* flush remainder of message */ 82 } css_softc[NCSS]; 83 84 /* 85 * Reset the IMP and cause a transmitter interrupt by 86 * performing a null DMA. 87 */ 88 cssprobe(reg) 89 caddr_t reg; 90 { 91 register int br, cvec; /* r11, r10 value-result */ 92 register struct cssdevice *addr = (struct cssdevice *)reg; 93 94 COUNT(CSSPROBE); 95 #ifdef lint 96 br = 0; cvec = br; br = cvec; 97 cssrint(0); cssxint(0); 98 #endif 99 100 101 addr->css_icsr = CSS_CLR; 102 addr->css_ocsr = CSS_CLR; 103 DELAY(50000); 104 addr->css_icsr = 0; 105 addr->css_ocsr = 0; 106 DELAY(50000); 107 108 addr->css_oba = 0; 109 addr->css_owc = -1; 110 addr->css_ocsr = CSS_IE | CSS_GO; /* enable interrupts */ 111 DELAY(50000); 112 addr->css_ocsr = 0; 113 114 return (1); 115 } 116 117 /* 118 * Call the IMP module to allow it to set up its internal 119 * state, then tie the two modules together by setting up 120 * the back pointers to common data structures. 121 */ 122 cssattach(ui) 123 struct uba_device *ui; 124 { 125 register struct css_softc *sc = &css_softc[ui->ui_unit]; 126 register struct impcb *ip; 127 struct ifimpcb { 128 struct ifnet ifimp_if; 129 struct impcb ifimp_impcb; 130 } *ifimp; 131 132 COUNT(CSSATTACH); 133 if ((ifimp = (struct ifimpcb *)impattach(ui, cssreset)) == 0) 134 panic("cssattach"); /* XXX */ 135 sc->css_if = &ifimp->ifimp_if; 136 ip = &ifimp->ifimp_impcb; 137 sc->css_ic = ip; 138 ip->ic_init = cssinit; 139 ip->ic_start = cssstart; 140 sc->css_ifuba.ifu_flags = UBA_CANTWAIT | UBA_NEED16; 141 #ifdef notdef 142 sc->css_ifuba.ifu_flags =| UBA_NEEDBDP; 143 #endif 144 } 145 146 /* 147 * Reset interface after UNIBUS reset. 148 * If interface is on specified uba, reset its state. 149 */ 150 cssreset(unit, uban) 151 int unit, uban; 152 { 153 register struct uba_device *ui; 154 struct css_softc *sc; 155 156 COUNT(CSSCLR); 157 if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0 || 158 ui->ui_ubanum != uban) 159 return; 160 printf(" css%d", unit); 161 sc = &css_softc[unit]; 162 /* must go through IMP to allow it to set state */ 163 (*sc->css_if->if_init)(unit); 164 } 165 166 /* 167 * Initialize interface: clear recorded pending operations, 168 * and retrieve, and reinitialize UNIBUS resources. 169 */ 170 cssinit(unit) 171 int unit; 172 { 173 register struct css_softc *sc; 174 register struct uba_device *ui; 175 register struct cssdevice *addr; 176 int x, info; 177 178 COUNT(CSSINIT); 179 if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0) { 180 printf("css%d: not alive\n", unit); 181 return(0); 182 } 183 sc = &css_softc[unit]; 184 185 /* 186 * Header length is 0 to if_ubainit since we have to pass 187 * the IMP leader up to the protocol interpretaion 188 * routines. If we had the deader length as 189 * sizeof(struct imp_leader), then the if_ routines 190 * would assume we handle it on input and output. 191 */ 192 193 if (if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,(int)btoc(IMPMTU)) == 0) { 194 printf("css%d: can't initialize\n", unit); 195 ui->ui_alive = 0; 196 return(0); 197 } 198 addr = (struct cssdevice *)ui->ui_addr; 199 200 /* reset the imp interface. */ 201 x = spl5(); 202 addr->css_icsr = CSS_CLR; 203 addr->css_ocsr = CSS_CLR; 204 DELAY(100); 205 addr->css_icsr = 0; 206 addr->css_ocsr = 0; 207 addr->css_icsr = IN_HRDY; /* close the relay */ 208 DELAY(5000); 209 splx(x); 210 211 /* 212 * This may hang if the imp isn't really there. 213 * Will test and verify safe operation. 214 */ 215 216 x = 500; 217 while (x-- > 0) { 218 if ((addr->css_icsr & (IN_HRDY|IN_IMPNR)) == IN_HRDY) 219 break; 220 addr->css_icsr = IN_HRDY; /* close the relay */ 221 DELAY(5000); 222 } 223 224 if (x <= 0) { 225 printf("css%d: imp doesn't respond, icsr=%b\n", unit, 226 CSS_INBITS, addr->css_icsr); 227 goto down; 228 } 229 230 /* 231 * Put up a read. We can't restart any outstanding writes 232 * until we're back in synch with the IMP (i.e. we've flushed 233 * the NOOPs it throws at us). 234 * Note: IMPMTU includes the leader. 235 */ 236 237 x = spl5(); 238 info = sc->css_ifuba.ifu_r.ifrw_info; 239 addr->css_iba = (u_short)info; 240 addr->css_iwc = -(IMPMTU >> 1); 241 addr->css_icsr = 242 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO; 243 splx(x); 244 return(1); 245 246 down: 247 ui->ui_alive = 0; 248 return(0); 249 } 250 251 /* 252 * Start output on an interface. 253 */ 254 cssstart(dev) 255 dev_t dev; 256 { 257 int unit = CSSUNIT(dev), info; 258 struct uba_device *ui = cssinfo[unit]; 259 register struct css_softc *sc = &css_softc[unit]; 260 register struct cssdevice *addr; 261 struct mbuf *m; 262 u_short cmd; 263 264 COUNT(CSSSTART); 265 if (sc->css_ic->ic_oactive) 266 goto restart; 267 268 /* 269 * Not already active, deqeue a request and 270 * map it onto the UNIBUS. If no more 271 * requeusts, just return. 272 */ 273 IF_DEQUEUE(&sc->css_if->if_snd, m); 274 if (m == 0) { 275 sc->css_ic->ic_oactive = 0; 276 return; 277 } 278 sc->css_olen = if_wubaput(&sc->css_ifuba, m); 279 280 restart: 281 /* 282 * Have request mapped to UNIBUS for transmission. 283 * Purge any stale data from the BDP, and start the output. 284 */ 285 if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP) 286 UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp); 287 addr = (struct cssdevice *)ui->ui_addr; 288 info = sc->css_ifuba.ifu_w.ifrw_info; 289 addr->css_oba = (u_short)info; 290 addr->css_owc = -((sc->css_olen + 1) >> 1); 291 cmd = CSS_IE | OUT_ENLB | ((info & 0x30000) >> 12) | CSS_GO; 292 addr->css_ocsr = cmd; 293 sc->css_ic->ic_oactive = 1; 294 } 295 296 /* 297 * Output interrupt handler. 298 */ 299 cssxint(unit) 300 { 301 register struct uba_device *ui = cssinfo[unit]; 302 register struct css_softc *sc = &css_softc[unit]; 303 register struct cssdevice *addr; 304 305 COUNT(CSSXINT); 306 addr = (struct cssdevice *)ui->ui_addr; 307 if (sc->css_ic->ic_oactive == 0) { 308 printf("css%d: stray output interrupt csr=%b\n", 309 unit, addr->css_ocsr, CSS_OUTBITS); 310 return; 311 } 312 sc->css_if->if_opackets++; 313 sc->css_ic->ic_oactive = 0; 314 if (addr->css_ocsr & CSS_ERR){ 315 sc->css_if->if_oerrors++; 316 printf("css%d: output error, ocsr=%b icsr=%b\n", unit, 317 addr->css_ocsr, CSS_OUTBITS, 318 addr->css_icsr, CSS_INBITS); 319 } 320 if (sc->css_ifuba.ifu_xtofree) { 321 m_freem(sc->css_ifuba.ifu_xtofree); 322 sc->css_ifuba.ifu_xtofree = 0; 323 } 324 if (sc->css_if->if_snd.ifq_head) 325 cssstart(unit); 326 } 327 328 /* 329 * Input interrupt handler 330 */ 331 cssrint(unit) 332 { 333 register struct css_softc *sc = &css_softc[unit]; 334 register struct cssdevice *addr; 335 register struct ifqueue *inq; 336 struct mbuf *m; 337 int len, info; 338 339 COUNT(CSSRINT); 340 sc->css_if->if_ipackets++; 341 342 /* 343 * Purge BDP; flush message if error indicated. 344 */ 345 346 addr = (struct cssdevice *)cssinfo[unit]->ui_addr; 347 if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP) 348 UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp); 349 if (addr->css_icsr & CSS_ERR) { 350 printf("css%d: recv error, csr=%b\n", unit, 351 addr->css_icsr, CSS_INBITS); 352 sc->css_if->if_ierrors++; 353 sc->css_flush = 1; 354 } 355 356 if (sc->css_flush) { 357 if (addr->css_icsr & IN_EOM) 358 sc->css_flush = 0; 359 goto setup; 360 } 361 362 len = IMPMTU + (addr->css_iwc << 1); 363 if (len < 0 || len > IMPMTU) { 364 printf("css%d: bad length=%d\n", len); 365 sc->css_if->if_ierrors++; 366 goto setup; 367 } 368 369 /* 370 * The last parameter is always 0 since using 371 * trailers on the ARPAnet is insane. 372 */ 373 m = if_rubaget(&sc->css_ifuba, len, 0); 374 if (m == 0) 375 goto setup; 376 if ((addr->css_icsr & IN_EOM) == 0) { 377 if (sc->css_iq) 378 m_cat(sc->css_iq, m); 379 else 380 sc->css_iq = m; 381 goto setup; 382 } 383 if (sc->css_iq) { 384 m_cat(sc->css_iq, m); 385 m = sc->css_iq; 386 sc->css_iq = 0; 387 } 388 impinput(unit, m); 389 390 setup: 391 /* 392 * Setup for next message. 393 */ 394 info = sc->css_ifuba.ifu_r.ifrw_info; 395 addr->css_iba = (u_short)info; 396 addr->css_iwc = - (IMPMTU >> 1); 397 addr->css_icsr = 398 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO; 399 } 400