1 /* if_css.c 6.2 84/08/29 */ 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 #include "../machine/pte.h" 30 31 #include "param.h" 32 #include "systm.h" 33 #include "mbuf.h" 34 #include "buf.h" 35 #include "protosw.h" 36 #include "socket.h" 37 #include "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 "if_cssreg.h" 45 #include "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 #ifdef lint 95 br = 0; cvec = br; br = cvec; 96 cssrint(0); cssxint(0); 97 #endif 98 99 100 addr->css_icsr = CSS_CLR; 101 addr->css_ocsr = CSS_CLR; 102 DELAY(50000); 103 addr->css_icsr = 0; 104 addr->css_ocsr = 0; 105 DELAY(50000); 106 107 addr->css_oba = 0; 108 addr->css_owc = -1; 109 addr->css_ocsr = CSS_IE | CSS_GO; /* enable interrupts */ 110 DELAY(50000); 111 addr->css_ocsr = 0; 112 113 return (1); 114 } 115 116 /* 117 * Call the IMP module to allow it to set up its internal 118 * state, then tie the two modules together by setting up 119 * the back pointers to common data structures. 120 */ 121 cssattach(ui) 122 struct uba_device *ui; 123 { 124 register struct css_softc *sc = &css_softc[ui->ui_unit]; 125 register struct impcb *ip; 126 struct ifimpcb { 127 struct ifnet ifimp_if; 128 struct impcb ifimp_impcb; 129 } *ifimp; 130 131 if ((ifimp = (struct ifimpcb *)impattach(ui, cssreset)) == 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 if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0 || 155 ui->ui_ubanum != uban) 156 return; 157 printf(" css%d", unit); 158 sc = &css_softc[unit]; 159 /* must go through IMP to allow it to set state */ 160 (*sc->css_if->if_init)(unit); 161 } 162 163 /* 164 * Initialize interface: clear recorded pending operations, 165 * and retrieve, and reinitialize UNIBUS resources. 166 */ 167 cssinit(unit) 168 int unit; 169 { 170 register struct css_softc *sc; 171 register struct uba_device *ui; 172 register struct cssdevice *addr; 173 int x, info; 174 175 if (unit >= NCSS || (ui = cssinfo[unit]) == 0 || ui->ui_alive == 0) { 176 printf("css%d: not alive\n", unit); 177 return(0); 178 } 179 sc = &css_softc[unit]; 180 181 /* 182 * Header length is 0 to if_ubainit since we have to pass 183 * the IMP leader up to the protocol interpretaion 184 * routines. If we had the deader length as 185 * sizeof(struct imp_leader), then the if_ routines 186 * would assume we handle it on input and output. 187 */ 188 189 if (if_ubainit(&sc->css_ifuba, ui->ui_ubanum, 0,(int)btoc(IMPMTU)) == 0) { 190 printf("css%d: can't initialize\n", unit); 191 ui->ui_alive = 0; 192 return(0); 193 } 194 addr = (struct cssdevice *)ui->ui_addr; 195 196 /* reset the imp interface. */ 197 x = spl5(); 198 addr->css_icsr = CSS_CLR; 199 addr->css_ocsr = CSS_CLR; 200 DELAY(100); 201 addr->css_icsr = 0; 202 addr->css_ocsr = 0; 203 addr->css_icsr = IN_HRDY; /* close the relay */ 204 DELAY(5000); 205 splx(x); 206 207 /* 208 * This may hang if the imp isn't really there. 209 * Will test and verify safe operation. 210 */ 211 212 x = 500; 213 while (x-- > 0) { 214 if ((addr->css_icsr & (IN_HRDY|IN_IMPNR)) == IN_HRDY) 215 break; 216 addr->css_icsr = IN_HRDY; /* close the relay */ 217 DELAY(5000); 218 } 219 220 if (x <= 0) { 221 printf("css%d: imp doesn't respond, icsr=%b\n", unit, 222 CSS_INBITS, addr->css_icsr); 223 goto down; 224 } 225 226 /* 227 * Put up a read. We can't restart any outstanding writes 228 * until we're back in synch with the IMP (i.e. we've flushed 229 * the NOOPs it throws at us). 230 * Note: IMPMTU includes the leader. 231 */ 232 233 x = spl5(); 234 info = sc->css_ifuba.ifu_r.ifrw_info; 235 addr->css_iba = (u_short)info; 236 addr->css_iwc = -(IMPMTU >> 1); 237 addr->css_icsr = 238 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO; 239 splx(x); 240 return(1); 241 242 down: 243 ui->ui_alive = 0; 244 return(0); 245 } 246 247 /* 248 * Start output on an interface. 249 */ 250 cssstart(dev) 251 dev_t dev; 252 { 253 int unit = CSSUNIT(dev), info; 254 struct uba_device *ui = cssinfo[unit]; 255 register struct css_softc *sc = &css_softc[unit]; 256 register struct cssdevice *addr; 257 struct mbuf *m; 258 u_short cmd; 259 260 if (sc->css_ic->ic_oactive) 261 goto restart; 262 263 /* 264 * Not already active, deqeue a request and 265 * map it onto the UNIBUS. If no more 266 * requeusts, just return. 267 */ 268 IF_DEQUEUE(&sc->css_if->if_snd, m); 269 if (m == 0) { 270 sc->css_ic->ic_oactive = 0; 271 return; 272 } 273 sc->css_olen = if_wubaput(&sc->css_ifuba, m); 274 275 restart: 276 /* 277 * Have request mapped to UNIBUS for transmission. 278 * Purge any stale data from the BDP, and start the output. 279 */ 280 if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP) 281 UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_w.ifrw_bdp); 282 addr = (struct cssdevice *)ui->ui_addr; 283 info = sc->css_ifuba.ifu_w.ifrw_info; 284 addr->css_oba = (u_short)info; 285 addr->css_owc = -((sc->css_olen + 1) >> 1); 286 cmd = CSS_IE | OUT_ENLB | ((info & 0x30000) >> 12) | CSS_GO; 287 addr->css_ocsr = cmd; 288 sc->css_ic->ic_oactive = 1; 289 } 290 291 /* 292 * Output interrupt handler. 293 */ 294 cssxint(unit) 295 { 296 register struct uba_device *ui = cssinfo[unit]; 297 register struct css_softc *sc = &css_softc[unit]; 298 register struct cssdevice *addr; 299 300 addr = (struct cssdevice *)ui->ui_addr; 301 if (sc->css_ic->ic_oactive == 0) { 302 printf("css%d: stray output interrupt csr=%b\n", 303 unit, addr->css_ocsr, CSS_OUTBITS); 304 return; 305 } 306 sc->css_if->if_opackets++; 307 sc->css_ic->ic_oactive = 0; 308 if (addr->css_ocsr & CSS_ERR){ 309 sc->css_if->if_oerrors++; 310 printf("css%d: output error, ocsr=%b icsr=%b\n", unit, 311 addr->css_ocsr, CSS_OUTBITS, 312 addr->css_icsr, CSS_INBITS); 313 } 314 if (sc->css_ifuba.ifu_xtofree) { 315 m_freem(sc->css_ifuba.ifu_xtofree); 316 sc->css_ifuba.ifu_xtofree = 0; 317 } 318 if (sc->css_if->if_snd.ifq_head) 319 cssstart(unit); 320 } 321 322 /* 323 * Input interrupt handler 324 */ 325 cssrint(unit) 326 { 327 register struct css_softc *sc = &css_softc[unit]; 328 register struct cssdevice *addr; 329 struct mbuf *m; 330 int len, info; 331 332 sc->css_if->if_ipackets++; 333 334 /* 335 * Purge BDP; flush message if error indicated. 336 */ 337 338 addr = (struct cssdevice *)cssinfo[unit]->ui_addr; 339 if (sc->css_ifuba.ifu_flags & UBA_NEEDBDP) 340 UBAPURGE(sc->css_ifuba.ifu_uba, sc->css_ifuba.ifu_r.ifrw_bdp); 341 if (addr->css_icsr & CSS_ERR) { 342 printf("css%d: recv error, csr=%b\n", unit, 343 addr->css_icsr, CSS_INBITS); 344 sc->css_if->if_ierrors++; 345 sc->css_flush = 1; 346 } 347 348 if (sc->css_flush) { 349 if (addr->css_icsr & IN_EOM) 350 sc->css_flush = 0; 351 goto setup; 352 } 353 354 len = IMPMTU + (addr->css_iwc << 1); 355 if (len < 0 || len > IMPMTU) { 356 printf("css%d: bad length=%d\n", len); 357 sc->css_if->if_ierrors++; 358 goto setup; 359 } 360 361 /* 362 * The last parameter is always 0 since using 363 * trailers on the ARPAnet is insane. 364 */ 365 m = if_rubaget(&sc->css_ifuba, len, 0); 366 if (m == 0) 367 goto setup; 368 if ((addr->css_icsr & IN_EOM) == 0) { 369 if (sc->css_iq) 370 m_cat(sc->css_iq, m); 371 else 372 sc->css_iq = m; 373 goto setup; 374 } 375 if (sc->css_iq) { 376 m_cat(sc->css_iq, m); 377 m = sc->css_iq; 378 sc->css_iq = 0; 379 } 380 impinput(unit, m); 381 382 setup: 383 /* 384 * Setup for next message. 385 */ 386 info = sc->css_ifuba.ifu_r.ifrw_info; 387 addr->css_iba = (u_short)info; 388 addr->css_iwc = - (IMPMTU >> 1); 389 addr->css_icsr = 390 IN_HRDY | CSS_IE | IN_WEN | ((info & 0x30000) >> 12) | CSS_GO; 391 } 392