1 /* if_css.c 4.2 82/10/09 */ 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/ubareg.h" 38 #include "../h/ubavar.h" 39 #include "../h/cpu.h" 40 #include "../h/mtpr.h" 41 #include "../h/vmmac.h" 42 #include "../vaxif/if_css.h" 43 #include "../net/if.h" 44 #include "../netimp/if_imp.h" 45 #include "../vaxif/if_uba.h" 46 47 int cssprobe(), cssattach(), cssrint(), cssxint(); 48 struct uba_device *cssinfo[NCSS]; 49 u_short cssstd[] = { 0 }; 50 struct uba_driver cssdriver = 51 { cssprobe, 0, cssattach, 0, cssstd, "css", cssinfo }; 52 #define CSSUNIT(x) minor(x) 53 54 int cssinit(), cssstart(), cssreset(); 55 56 /* 57 * "Lower half" of IMP interface driver. 58 * 59 * Each IMP interface is handled by a common module which handles 60 * the IMP-host protocol and a hardware driver which manages the 61 * hardware specific details of talking with the IMP. 62 * 63 * The hardware portion of the IMP driver handles DMA and related 64 * management of UNIBUS resources. The IMP protocol module interprets 65 * contents of these messages and "controls" the actions of the 66 * hardware module during IMP resets, but not, for instance, during 67 * UNIBUS resets. 68 * 69 * The two modules are coupled at "attach time", and ever after, 70 * through the imp interface structure. Higher level protocols, 71 * e.g. IP, interact with the IMP driver, rather than the CSS. 72 */ 73 struct css_softc { 74 struct ifnet *css_if; /* pointer to IMP's ifnet struct */ 75 struct impcb *css_ic; /* data structure shared with IMP */ 76 struct ifuba css_ifuba; /* UNIBUS resources */ 77 struct mbuf *css_iq; /* input reassembly queue */ 78 short css_olen; /* size of last message sent */ 79 char css_flush; /* flush remainder of message */ 80 } css_softc[NCSS]; 81 82 /* 83 * Reset the IMP and cause a transmitter interrupt by 84 * performing a null DMA. 85 */ 86 cssprobe(reg) 87 caddr_t reg; 88 { 89 register int br, cvec; /* r11, r10 value-result */ 90 register struct cssdevice *addr = (struct cssdevice *)reg; 91 92 COUNT(CSSPROBE); 93 #ifdef lint 94 br = 0; cvec = br; br = cvec; 95 cssrint(0); cssxint(0); 96 #endif 97 98 99 addr->css_icsr = CSS_CLR; 100 addr->css_ocsr = CSS_CLR; 101 DELAY(50000); 102 addr->css_icsr = 0; 103 addr->css_ocsr = 0; 104 DELAY(50000); 105 106 addr->css_oba = 0; 107 addr->css_owc = -1; 108 addr->css_ocsr = CSS_IE | CSS_GO; /* enable interrupts */ 109 DELAY(50000); 110 addr->css_ocsr = 0; 111 112 return (1); 113 } 114 115 /* 116 * Call the IMP module to allow it to set up its internal 117 * state, then tie the two modules together by setting up 118 * the back pointers to common data structures. 119 */ 120 cssattach(ui) 121 struct uba_device *ui; 122 { 123 register struct css_softc *sc = &css_softc[ui->ui_unit]; 124 register struct impcb *ip; 125 struct ifimpcb { 126 struct ifnet ifimp_if; 127 struct impcb ifimp_impcb; 128 } *ifimp; 129 130 COUNT(CSSATTACH); 131 if ((ifimp = (struct ifimpcb *)impattach(ui)) == 0) 132 panic("cssattach"); /* XXX */ 133 sc->css_if = &ifimp->ifimp_if; 134 ip = &ifimp->ifimp_impcb; 135 sc->css_ic = ip; 136 ip->ic_init = cssinit; 137 ip->ic_start = cssstart; 138 sc->css_ifuba.ifu_flags = UBA_CANTWAIT | UBA_NEED16; 139 #ifdef notdef 140 sc->css_ifuba.ifu_flags =| UBA_NEEDBDP; 141 #endif 142 } 143 144 /* 145 * Reset interface after UNIBUS reset. 146 * If interface is on specified uba, reset its state. 147 */ 148 cssreset(unit, uban) 149 int unit, uban; 150 { 151 register struct uba_device *ui; 152 struct css_softc *sc; 153 154 COUNT(CSSCLR); 155 if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0 || 156 ui->ui_ubanum != uban) 157 return; 158 printf(" css%d", unit); 159 sc = &css_softc[unit]; 160 /* must go through IMP to allow it to set state */ 161 (*sc->css_if->if_init)(unit); 162 } 163 164 /* 165 * Initialize interface: clear recorded pending operations, 166 * and retrieve, and reinitialize UNIBUS resources. 167 */ 168 cssinit(unit) 169 int unit; 170 { 171 register struct css_softc *sc; 172 register struct uba_device *ui; 173 register struct cssdevice *addr; 174 int x, info; 175 176 COUNT(CSSINIT); 177 if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0) { 178 printf("css%d: not alive\n", unit); 179 return(0); 180 } 181 sc = &css_softc[unit]; 182 183 /* 184 * Header length is 0 to if_ubainit since we have to pass 185 * the IMP leader up to the protocol interpretaion 186 * routines. If we had the deader length as 187 * sizeof(struct imp_leader), then the if_ routines 188 * would assume we handle it on input and output. 189 */ 190 191 if (if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,(int)btoc(IMPMTU)) == 0) { 192 printf("css%d: can't initialize\n", unit); 193 ui->ui_alive = 0; 194 return(0); 195 } 196 addr = (struct cssdevice *)ui->ui_addr; 197 198 /* reset the imp interface. */ 199 x = spl5(); 200 addr->css_icsr = CSS_CLR; 201 addr->css_ocsr = CSS_CLR; 202 DELAY(100); 203 addr->css_icsr = 0; 204 addr->css_ocsr = 0; 205 addr->css_icsr = IN_HRDY; /* close the relay */ 206 DELAY(5000); 207 splx(x); 208 209 /* 210 * This may hang if the imp isn't really there. 211 * Will test and verify safe operation. 212 */ 213 214 x = 500; 215 while (x-- > 0) { 216 if ((addr->css_icsr & (IN_HRDY|IN_IMPNR)) == IN_HRDY) 217 break; 218 addr->css_icsr = IN_HRDY; /* close the relay */ 219 DELAY(5000); 220 } 221 222 if (x <= 0) { 223 printf("css%d: imp doesn't respond, icsr=%b\n", unit, 224 CSS_INBITS, addr->css_icsr); 225 goto down; 226 } 227 228 /* 229 * Put up a read. We can't restart any outstanding writes 230 * until we're back in synch with the IMP (i.e. we've flushed 231 * the NOOPs it throws at us). 232 * Note: IMPMTU includes the leader. 233 */ 234 235 x = spl5(); 236 info = sc->css_ifuba.ifu_r.ifrw_info; 237 addr->css_iba = (u_short)info; 238 addr->css_iwc = -(IMPMTU >> 1); 239 addr->css_icsr = 240 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO; 241 splx(x); 242 return(1); 243 244 down: 245 ui->ui_alive = 0; 246 return(0); 247 } 248 249 /* 250 * Start output on an interface. 251 */ 252 cssstart(dev) 253 dev_t dev; 254 { 255 int unit = CSSUNIT(dev), info; 256 struct uba_device *ui = cssinfo[unit]; 257 register struct css_softc *sc = &css_softc[unit]; 258 register struct cssdevice *addr; 259 struct mbuf *m; 260 u_short cmd; 261 262 COUNT(CSSSTART); 263 if (sc->css_ic->ic_oactive) 264 goto restart; 265 266 /* 267 * Not already active, deqeue a request and 268 * map it onto the UNIBUS. If no more 269 * requeusts, just return. 270 */ 271 IF_DEQUEUE(&sc->css_if->if_snd, m); 272 if (m == 0) { 273 sc->css_ic->ic_oactive = 0; 274 return; 275 } 276 sc->css_olen = if_wubaput(&sc->css_ifuba, m); 277 278 restart: 279 /* 280 * Have request mapped to UNIBUS for transmission. 281 * Purge any stale data from the BDP, and start the output. 282 */ 283 if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP) 284 UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp); 285 addr = (struct cssdevice *)ui->ui_addr; 286 info = sc->css_ifuba.ifu_w.ifrw_info; 287 addr->css_oba = (u_short)info; 288 addr->css_owc = -((sc->css_olen + 1) >> 1); 289 cmd = CSS_IE | OUT_ENLB | ((info & 0x30000) >> 12) | CSS_GO; 290 addr->css_ocsr = cmd; 291 sc->css_ic->ic_oactive = 1; 292 } 293 294 /* 295 * Output interrupt handler. 296 */ 297 cssxint(unit) 298 { 299 register struct uba_device *ui = cssinfo[unit]; 300 register struct css_softc *sc = &css_softc[unit]; 301 register struct cssdevice *addr; 302 303 COUNT(CSSXINT); 304 addr = (struct cssdevice *)ui->ui_addr; 305 if (sc->css_ic->ic_oactive == 0) { 306 printf("css%d: stray output interrupt csr=%b\n", 307 unit, addr->css_ocsr, CSS_OUTBITS); 308 return; 309 } 310 sc->css_if->if_opackets++; 311 sc->css_ic->ic_oactive = 0; 312 if (addr->css_ocsr & CSS_ERR){ 313 sc->css_if->if_oerrors++; 314 printf("css%d: output error, ocsr=%b icsr=%b\n", unit, 315 addr->css_ocsr, CSS_OUTBITS, 316 addr->css_icsr, CSS_INBITS); 317 } 318 if (sc->css_ifuba.ifu_xtofree) { 319 m_freem(sc->css_ifuba.ifu_xtofree); 320 sc->css_ifuba.ifu_xtofree = 0; 321 } 322 if (sc->css_if->if_snd.ifq_head) 323 cssstart(unit); 324 } 325 326 /* 327 * Input interrupt handler 328 */ 329 cssrint(unit) 330 { 331 register struct css_softc *sc = &css_softc[unit]; 332 register struct cssdevice *addr; 333 register struct ifqueue *inq; 334 struct mbuf *m; 335 int len, info; 336 337 COUNT(CSSRINT); 338 sc->css_if->if_ipackets++; 339 340 /* 341 * Purge BDP; flush message if error indicated. 342 */ 343 344 addr = (struct cssdevice *)cssinfo[unit]->ui_addr; 345 if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP) 346 UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp); 347 if (addr->css_icsr & CSS_ERR) { 348 printf("css%d: recv error, csr=%b\n", unit, 349 addr->css_icsr, CSS_INBITS); 350 sc->css_if->if_ierrors++; 351 sc->css_flush = 1; 352 } 353 354 if (sc->css_flush) { 355 if (addr->css_icsr & IN_EOM) 356 sc->css_flush = 0; 357 goto setup; 358 } 359 360 len = IMPMTU + (addr->css_iwc << 1); 361 if (len < 0 || len > IMPMTU) { 362 printf("css%d: bad length=%d\n", len); 363 sc->css_if->if_ierrors++; 364 goto setup; 365 } 366 367 /* 368 * The last parameter is always 0 since using 369 * trailers on the ARPAnet is insane. 370 */ 371 m = if_rubaget(&sc->css_ifuba, len, 0); 372 if (m == 0) 373 goto setup; 374 if ((addr->css_icsr & IN_EOM) == 0) { 375 if (sc->css_iq) 376 m_cat(sc->css_iq, m); 377 else 378 sc->css_iq = m; 379 goto setup; 380 } 381 if (sc->css_iq) { 382 m_cat(sc->css_iq, m); 383 m = sc->css_iq; 384 sc->css_iq = 0; 385 } 386 impinput(unit, m); 387 388 setup: 389 /* 390 * Setup for next message. 391 */ 392 info = sc->css_ifuba.ifu_r.ifrw_info; 393 addr->css_iba = (u_short)info; 394 addr->css_iwc = - (IMPMTU >> 1); 395 addr->css_icsr = 396 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO; 397 } 398