if_dmc.c revision 1.21
1 /* $NetBSD: if_dmc.c,v 1.21 2012/10/27 17:18:37 chs Exp $ */ 2 /* 3 * Copyright (c) 1982, 1986 Regents of the University of California. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)if_dmc.c 7.10 (Berkeley) 12/16/90 31 */ 32 33 /* 34 * DMC11 device driver, internet version 35 * 36 * Bill Nesheim 37 * Cornell University 38 * 39 * Lou Salkind 40 * New York University 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: if_dmc.c,v 1.21 2012/10/27 17:18:37 chs Exp $"); 45 46 #undef DMCDEBUG /* for base table dump on fatal error */ 47 48 #include "opt_inet.h" 49 50 #include <sys/param.h> 51 #include <sys/systm.h> 52 #include <sys/mbuf.h> 53 #include <sys/ioctl.h> 54 #include <sys/socket.h> 55 #include <sys/syslog.h> 56 #include <sys/device.h> 57 58 #include <net/if.h> 59 #include <net/netisr.h> 60 61 #ifdef INET 62 #include <netinet/in.h> 63 #include <netinet/in_var.h> 64 #endif 65 66 #include <sys/bus.h> 67 68 #include <dev/qbus/ubareg.h> 69 #include <dev/qbus/ubavar.h> 70 #include <dev/qbus/if_uba.h> 71 72 #include <dev/qbus/if_dmcreg.h> 73 74 75 /* 76 * output timeout value, sec.; should depend on line speed. 77 */ 78 static int dmc_timeout = 20; 79 80 #define NRCV 7 81 #define NXMT 3 82 #define NCMDS (NRCV+NXMT+4) /* size of command queue */ 83 84 #define DMC_WBYTE(csr, val) \ 85 bus_space_write_1(sc->sc_iot, sc->sc_ioh, csr, val) 86 #define DMC_WWORD(csr, val) \ 87 bus_space_write_2(sc->sc_iot, sc->sc_ioh, csr, val) 88 #define DMC_RBYTE(csr) \ 89 bus_space_read_1(sc->sc_iot, sc->sc_ioh, csr) 90 #define DMC_RWORD(csr) \ 91 bus_space_read_2(sc->sc_iot, sc->sc_ioh, csr) 92 93 94 #ifdef DMCDEBUG 95 #define printd if(dmcdebug)printf 96 int dmcdebug = 0; 97 #endif 98 99 /* error reporting intervals */ 100 #define DMC_RPNBFS 50 101 #define DMC_RPDSC 1 102 #define DMC_RPTMO 10 103 #define DMC_RPDCK 10 104 105 struct dmc_command { 106 char qp_cmd; /* command */ 107 short qp_ubaddr; /* buffer address */ 108 short qp_cc; /* character count || XMEM */ 109 struct dmc_command *qp_next; /* next command on queue */ 110 }; 111 112 struct dmcbufs { 113 int ubinfo; /* from uballoc */ 114 short cc; /* buffer size */ 115 short flags; /* access control */ 116 }; 117 #define DBUF_OURS 0 /* buffer is available */ 118 #define DBUF_DMCS 1 /* buffer claimed by somebody */ 119 #define DBUF_XMIT 4 /* transmit buffer */ 120 #define DBUF_RCV 8 /* receive buffer */ 121 122 123 /* 124 * DMC software status per interface. 125 * 126 * Each interface is referenced by a network interface structure, 127 * sc_if, which the routing code uses to locate the interface. 128 * This structure contains the output queue for the interface, its address, ... 129 * We also have, for each interface, a set of 7 UBA interface structures 130 * for each, which 131 * contain information about the UNIBUS resources held by the interface: 132 * map registers, buffered data paths, etc. Information is cached in this 133 * structure for use by the if_uba.c routines in running the interface 134 * efficiently. 135 */ 136 struct dmc_softc { 137 device_t sc_dev; /* Configuration common part */ 138 struct ifnet sc_if; /* network-visible interface */ 139 short sc_oused; /* output buffers currently in use */ 140 short sc_iused; /* input buffers given to DMC */ 141 short sc_flag; /* flags */ 142 struct ubinfo sc_ui; /* UBA mapping info for base table */ 143 int sc_errors[4]; /* non-fatal error counters */ 144 bus_space_tag_t sc_iot; 145 bus_addr_t sc_ioh; 146 bus_dma_tag_t sc_dmat; 147 struct evcnt sc_rintrcnt; /* Interrupt counting */ 148 struct evcnt sc_tintrcnt; /* Interrupt counting */ 149 #define sc_datck sc_errors[0] 150 #define sc_timeo sc_errors[1] 151 #define sc_nobuf sc_errors[2] 152 #define sc_disc sc_errors[3] 153 struct dmcbufs sc_rbufs[NRCV]; /* receive buffer info */ 154 struct dmcbufs sc_xbufs[NXMT]; /* transmit buffer info */ 155 struct ifubinfo sc_ifuba; /* UNIBUS resources */ 156 struct ifrw sc_ifr[NRCV]; /* UNIBUS receive buffer maps */ 157 struct ifxmt sc_ifw[NXMT]; /* UNIBUS receive buffer maps */ 158 /* command queue stuff */ 159 struct dmc_command sc_cmdbuf[NCMDS]; 160 struct dmc_command *sc_qhead; /* head of command queue */ 161 struct dmc_command *sc_qtail; /* tail of command queue */ 162 struct dmc_command *sc_qactive; /* command in progress */ 163 struct dmc_command *sc_qfreeh; /* head of list of free cmd buffers */ 164 struct dmc_command *sc_qfreet; /* tail of list of free cmd buffers */ 165 /* end command queue stuff */ 166 struct dmc_base { 167 short d_base[128]; /* DMC base table */ 168 } dmc_base; 169 }; 170 171 static int dmcmatch(device_t, cfdata_t, void *); 172 static void dmcattach(device_t, device_t, void *); 173 static int dmcinit(struct ifnet *); 174 static void dmcrint(void *); 175 static void dmcxint(void *); 176 static void dmcdown(struct dmc_softc *sc); 177 static void dmcrestart(struct dmc_softc *); 178 static void dmcload(struct dmc_softc *, int, u_short, u_short); 179 static void dmcstart(struct ifnet *); 180 static void dmctimeout(struct ifnet *); 181 static int dmcioctl(struct ifnet *, u_long, void *); 182 static int dmcoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 183 struct rtentry *); 184 static void dmcreset(device_t); 185 186 CFATTACH_DECL_NEW(dmc, sizeof(struct dmc_softc), 187 dmcmatch, dmcattach, NULL, NULL); 188 189 /* flags */ 190 #define DMC_RUNNING 0x01 /* device initialized */ 191 #define DMC_BMAPPED 0x02 /* base table mapped */ 192 #define DMC_RESTART 0x04 /* software restart in progress */ 193 #define DMC_ONLINE 0x08 /* device running (had a RDYO) */ 194 195 196 /* queue manipulation macros */ 197 #define QUEUE_AT_HEAD(qp, head, tail) \ 198 (qp)->qp_next = (head); \ 199 (head) = (qp); \ 200 if ((tail) == (struct dmc_command *) 0) \ 201 (tail) = (head) 202 203 #define QUEUE_AT_TAIL(qp, head, tail) \ 204 if ((tail)) \ 205 (tail)->qp_next = (qp); \ 206 else \ 207 (head) = (qp); \ 208 (qp)->qp_next = (struct dmc_command *) 0; \ 209 (tail) = (qp) 210 211 #define DEQUEUE(head, tail) \ 212 (head) = (head)->qp_next;\ 213 if ((head) == (struct dmc_command *) 0)\ 214 (tail) = (head) 215 216 int 217 dmcmatch(device_t parent, cfdata_t cf, void *aux) 218 { 219 struct uba_attach_args *ua = aux; 220 struct dmc_softc ssc; 221 struct dmc_softc *sc = &ssc; 222 int i; 223 224 sc->sc_iot = ua->ua_iot; 225 sc->sc_ioh = ua->ua_ioh; 226 227 DMC_WBYTE(DMC_BSEL1, DMC_MCLR); 228 for (i = 100000; i && (DMC_RBYTE(DMC_BSEL1) & DMC_RUN) == 0; i--) 229 ; 230 if ((DMC_RBYTE(DMC_BSEL1) & DMC_RUN) == 0) { 231 printf("dmcprobe: can't start device\n" ); 232 return (0); 233 } 234 DMC_WBYTE(DMC_BSEL0, DMC_RQI|DMC_IEI); 235 /* let's be paranoid */ 236 DMC_WBYTE(DMC_BSEL0, DMC_RBYTE(DMC_BSEL0) | DMC_RQI|DMC_IEI); 237 DELAY(1000000); 238 DMC_WBYTE(DMC_BSEL1, DMC_MCLR); 239 for (i = 100000; i && (DMC_RBYTE(DMC_BSEL1) & DMC_RUN) == 0; i--) 240 ; 241 return (1); 242 } 243 244 /* 245 * Interface exists: make available by filling in network interface 246 * record. System will initialize the interface when it is ready 247 * to accept packets. 248 */ 249 void 250 dmcattach(device_t parent, device_t self, void *aux) 251 { 252 struct uba_attach_args *ua = aux; 253 struct dmc_softc *sc = device_private(self); 254 255 sc->sc_dev = self; 256 sc->sc_iot = ua->ua_iot; 257 sc->sc_ioh = ua->ua_ioh; 258 sc->sc_dmat = ua->ua_dmat; 259 260 strlcpy(sc->sc_if.if_xname, device_xname(sc->sc_dev), IFNAMSIZ); 261 sc->sc_if.if_mtu = DMCMTU; 262 sc->sc_if.if_init = dmcinit; 263 sc->sc_if.if_output = dmcoutput; 264 sc->sc_if.if_ioctl = dmcioctl; 265 sc->sc_if.if_watchdog = dmctimeout; 266 sc->sc_if.if_flags = IFF_POINTOPOINT; 267 sc->sc_if.if_softc = sc; 268 IFQ_SET_READY(&sc->sc_if.if_snd); 269 270 uba_intr_establish(ua->ua_icookie, ua->ua_cvec, dmcrint, sc, 271 &sc->sc_rintrcnt); 272 uba_intr_establish(ua->ua_icookie, ua->ua_cvec+4, dmcxint, sc, 273 &sc->sc_tintrcnt); 274 uba_reset_establish(dmcreset, sc->sc_dev); 275 evcnt_attach_dynamic(&sc->sc_rintrcnt, EVCNT_TYPE_INTR, ua->ua_evcnt, 276 device_xname(sc->sc_dev), "intr"); 277 evcnt_attach_dynamic(&sc->sc_tintrcnt, EVCNT_TYPE_INTR, ua->ua_evcnt, 278 device_xname(sc->sc_dev), "intr"); 279 280 if_attach(&sc->sc_if); 281 } 282 283 /* 284 * Reset of interface after UNIBUS reset. 285 * If interface is on specified UBA, reset its state. 286 */ 287 void 288 dmcreset(device_t dev) 289 { 290 struct dmc_softc *sc = device_private(dev); 291 292 sc->sc_flag = 0; 293 sc->sc_if.if_flags &= ~IFF_RUNNING; 294 dmcinit(&sc->sc_if); 295 } 296 297 /* 298 * Initialization of interface; reinitialize UNIBUS usage. 299 */ 300 int 301 dmcinit(struct ifnet *ifp) 302 { 303 struct dmc_softc *sc = ifp->if_softc; 304 struct ifrw *ifrw; 305 struct ifxmt *ifxp; 306 struct dmcbufs *rp; 307 struct dmc_command *qp; 308 struct ifaddr *ifa; 309 cfdata_t ui = device_cfdata(sc->sc_dev); 310 int base; 311 int s; 312 313 /* 314 * Check to see that an address has been set 315 * (both local and destination for an address family). 316 */ 317 IFADDR_FOREACH(ifa, ifp) 318 if (ifa->ifa_addr->sa_family && ifa->ifa_dstaddr->sa_family) 319 break; 320 if (ifa == (struct ifaddr *) 0) 321 return 0; 322 323 if ((DMC_RBYTE(DMC_BSEL1) & DMC_RUN) == 0) { 324 printf("dmcinit: DMC not running\n"); 325 ifp->if_flags &= ~IFF_UP; 326 return 0; 327 } 328 /* map base table */ 329 if ((sc->sc_flag & DMC_BMAPPED) == 0) { 330 sc->sc_ui.ui_size = sizeof(struct dmc_base); 331 sc->sc_ui.ui_vaddr = (void *)&sc->dmc_base; 332 uballoc(device_private(device_parent(sc->sc_dev)), &sc->sc_ui, 0); 333 sc->sc_flag |= DMC_BMAPPED; 334 } 335 /* initialize UNIBUS resources */ 336 sc->sc_iused = sc->sc_oused = 0; 337 if ((ifp->if_flags & IFF_RUNNING) == 0) { 338 if (if_ubaminit(&sc->sc_ifuba, 339 device_private(device_parent(sc->sc_dev)), 340 sizeof(struct dmc_header) + DMCMTU, 341 sc->sc_ifr, NRCV, sc->sc_ifw, NXMT) == 0) { 342 aprint_error_dev(sc->sc_dev, "can't allocate uba resources\n"); 343 ifp->if_flags &= ~IFF_UP; 344 return 0; 345 } 346 ifp->if_flags |= IFF_RUNNING; 347 } 348 sc->sc_flag &= ~DMC_ONLINE; 349 sc->sc_flag |= DMC_RUNNING; 350 /* 351 * Limit packets enqueued until we see if we're on the air. 352 */ 353 ifp->if_snd.ifq_maxlen = 3; 354 355 /* initialize buffer pool */ 356 /* receives */ 357 ifrw = &sc->sc_ifr[0]; 358 for (rp = &sc->sc_rbufs[0]; rp < &sc->sc_rbufs[NRCV]; rp++) { 359 rp->ubinfo = ifrw->ifrw_info; 360 rp->cc = DMCMTU + sizeof (struct dmc_header); 361 rp->flags = DBUF_OURS|DBUF_RCV; 362 ifrw++; 363 } 364 /* transmits */ 365 ifxp = &sc->sc_ifw[0]; 366 for (rp = &sc->sc_xbufs[0]; rp < &sc->sc_xbufs[NXMT]; rp++) { 367 rp->ubinfo = ifxp->ifw_info; 368 rp->cc = 0; 369 rp->flags = DBUF_OURS|DBUF_XMIT; 370 ifxp++; 371 } 372 373 /* set up command queues */ 374 sc->sc_qfreeh = sc->sc_qfreet 375 = sc->sc_qhead = sc->sc_qtail = sc->sc_qactive = 376 (struct dmc_command *)0; 377 /* set up free command buffer list */ 378 for (qp = &sc->sc_cmdbuf[0]; qp < &sc->sc_cmdbuf[NCMDS]; qp++) { 379 QUEUE_AT_HEAD(qp, sc->sc_qfreeh, sc->sc_qfreet); 380 } 381 382 /* base in */ 383 base = sc->sc_ui.ui_baddr; 384 dmcload(sc, DMC_BASEI, (u_short)base, (base>>2) & DMC_XMEM); 385 /* specify half duplex operation, flags tell if primary */ 386 /* or secondary station */ 387 if (ui->cf_flags == 0) 388 /* use DDCMP mode in full duplex */ 389 dmcload(sc, DMC_CNTLI, 0, 0); 390 else if (ui->cf_flags == 1) 391 /* use MAINTENENCE mode */ 392 dmcload(sc, DMC_CNTLI, 0, DMC_MAINT ); 393 else if (ui->cf_flags == 2) 394 /* use DDCMP half duplex as primary station */ 395 dmcload(sc, DMC_CNTLI, 0, DMC_HDPLX); 396 else if (ui->cf_flags == 3) 397 /* use DDCMP half duplex as secondary station */ 398 dmcload(sc, DMC_CNTLI, 0, DMC_HDPLX | DMC_SEC); 399 400 /* enable operation done interrupts */ 401 while ((DMC_RBYTE(DMC_BSEL2) & DMC_IEO) == 0) 402 DMC_WBYTE(DMC_BSEL2, DMC_RBYTE(DMC_BSEL2) | DMC_IEO); 403 s = splnet(); 404 /* queue first NRCV buffers for DMC to fill */ 405 for (rp = &sc->sc_rbufs[0]; rp < &sc->sc_rbufs[NRCV]; rp++) { 406 rp->flags |= DBUF_DMCS; 407 dmcload(sc, DMC_READ, rp->ubinfo, 408 (((rp->ubinfo>>2)&DMC_XMEM) | rp->cc)); 409 sc->sc_iused++; 410 } 411 splx(s); 412 return 0; 413 } 414 415 /* 416 * Start output on interface. Get another datagram 417 * to send from the interface queue and map it to 418 * the interface before starting output. 419 * 420 * Must be called at spl 5 421 */ 422 void 423 dmcstart(struct ifnet *ifp) 424 { 425 struct dmc_softc *sc = ifp->if_softc; 426 struct mbuf *m; 427 struct dmcbufs *rp; 428 int n; 429 430 /* 431 * Dequeue up to NXMT requests and map them to the UNIBUS. 432 * If no more requests, or no dmc buffers available, just return. 433 */ 434 n = 0; 435 for (rp = &sc->sc_xbufs[0]; rp < &sc->sc_xbufs[NXMT]; rp++ ) { 436 /* find an available buffer */ 437 if ((rp->flags & DBUF_DMCS) == 0) { 438 IFQ_DEQUEUE(&sc->sc_if.if_snd, m); 439 if (m == 0) 440 return; 441 /* mark it dmcs */ 442 rp->flags |= (DBUF_DMCS); 443 /* 444 * Have request mapped to UNIBUS for transmission 445 * and start the output. 446 */ 447 rp->cc = if_ubaput(&sc->sc_ifuba, &sc->sc_ifw[n], m); 448 rp->cc &= DMC_CCOUNT; 449 if (++sc->sc_oused == 1) 450 sc->sc_if.if_timer = dmc_timeout; 451 dmcload(sc, DMC_WRITE, rp->ubinfo, 452 rp->cc | ((rp->ubinfo>>2)&DMC_XMEM)); 453 } 454 n++; 455 } 456 } 457 458 /* 459 * Utility routine to load the DMC device registers. 460 */ 461 void 462 dmcload(struct dmc_softc *sc, int type, u_short w0, u_short w1) 463 { 464 struct dmc_command *qp; 465 int sps; 466 467 sps = splnet(); 468 469 /* grab a command buffer from the free list */ 470 if ((qp = sc->sc_qfreeh) == (struct dmc_command *)0) 471 panic("dmc command queue overflow"); 472 DEQUEUE(sc->sc_qfreeh, sc->sc_qfreet); 473 474 /* fill in requested info */ 475 qp->qp_cmd = (type | DMC_RQI); 476 qp->qp_ubaddr = w0; 477 qp->qp_cc = w1; 478 479 if (sc->sc_qactive) { /* command in progress */ 480 if (type == DMC_READ) { 481 QUEUE_AT_HEAD(qp, sc->sc_qhead, sc->sc_qtail); 482 } else { 483 QUEUE_AT_TAIL(qp, sc->sc_qhead, sc->sc_qtail); 484 } 485 } else { /* command port free */ 486 sc->sc_qactive = qp; 487 DMC_WBYTE(DMC_BSEL0, qp->qp_cmd); 488 dmcrint(sc); 489 } 490 splx(sps); 491 } 492 493 /* 494 * DMC interface receiver interrupt. 495 * Ready to accept another command, 496 * pull one off the command queue. 497 */ 498 void 499 dmcrint(void *arg) 500 { 501 struct dmc_softc *sc = arg; 502 struct dmc_command *qp; 503 int n; 504 505 if ((qp = sc->sc_qactive) == (struct dmc_command *) 0) { 506 printf("%s: dmcrint no command\n", device_xname(sc->sc_dev)); 507 return; 508 } 509 while (DMC_RBYTE(DMC_BSEL0) & DMC_RDYI) { 510 DMC_WWORD(DMC_SEL4, qp->qp_ubaddr); 511 DMC_WWORD(DMC_SEL6, qp->qp_cc); 512 DMC_WBYTE(DMC_BSEL0, DMC_RBYTE(DMC_BSEL0) & ~(DMC_IEI|DMC_RQI)); 513 /* free command buffer */ 514 QUEUE_AT_HEAD(qp, sc->sc_qfreeh, sc->sc_qfreet); 515 while (DMC_RBYTE(DMC_BSEL0) & DMC_RDYI) { 516 /* 517 * Can't check for RDYO here 'cause 518 * this routine isn't reentrant! 519 */ 520 DELAY(5); 521 } 522 /* move on to next command */ 523 if ((sc->sc_qactive = sc->sc_qhead) == (struct dmc_command *)0) 524 break; /* all done */ 525 /* more commands to do, start the next one */ 526 qp = sc->sc_qactive; 527 DEQUEUE(sc->sc_qhead, sc->sc_qtail); 528 DMC_WBYTE(DMC_BSEL0, qp->qp_cmd); 529 n = RDYSCAN; 530 while (n-- > 0) 531 if ((DMC_RBYTE(DMC_BSEL0) & DMC_RDYI) || 532 (DMC_RBYTE(DMC_BSEL2) & DMC_RDYO)) 533 break; 534 } 535 if (sc->sc_qactive) { 536 DMC_WBYTE(DMC_BSEL0, DMC_RBYTE(DMC_BSEL0) & (DMC_IEI|DMC_RQI)); 537 /* VMS does it twice !*$%@# */ 538 DMC_WBYTE(DMC_BSEL0, DMC_RBYTE(DMC_BSEL0) & (DMC_IEI|DMC_RQI)); 539 } 540 541 } 542 543 /* 544 * DMC interface transmitter interrupt. 545 * A transfer may have completed, check for errors. 546 * If it was a read, notify appropriate protocol. 547 * If it was a write, pull the next one off the queue. 548 */ 549 void 550 dmcxint(void *a) 551 { 552 struct dmc_softc *sc = a; 553 554 struct ifnet *ifp; 555 struct mbuf *m; 556 struct ifqueue *inq; 557 int arg, pkaddr, cmd, len, s; 558 struct ifrw *ifrw; 559 struct dmcbufs *rp; 560 struct ifxmt *ifxp; 561 struct dmc_header *dh; 562 char buf[64]; 563 564 ifp = &sc->sc_if; 565 566 while (DMC_RBYTE(DMC_BSEL2) & DMC_RDYO) { 567 568 cmd = DMC_RBYTE(DMC_BSEL2) & 0xff; 569 arg = DMC_RWORD(DMC_SEL6) & 0xffff; 570 /* reconstruct UNIBUS address of buffer returned to us */ 571 pkaddr = ((arg&DMC_XMEM)<<2) | (DMC_RWORD(DMC_SEL4) & 0xffff); 572 /* release port */ 573 DMC_WBYTE(DMC_BSEL2, DMC_RBYTE(DMC_BSEL2) & ~DMC_RDYO); 574 switch (cmd & 07) { 575 576 case DMC_OUR: 577 /* 578 * A read has completed. 579 * Pass packet to type specific 580 * higher-level input routine. 581 */ 582 ifp->if_ipackets++; 583 /* find location in dmcuba struct */ 584 ifrw= &sc->sc_ifr[0]; 585 for (rp = &sc->sc_rbufs[0]; rp < &sc->sc_rbufs[NRCV]; rp++) { 586 if(rp->ubinfo == pkaddr) 587 break; 588 ifrw++; 589 } 590 if (rp >= &sc->sc_rbufs[NRCV]) 591 panic("dmc rcv"); 592 if ((rp->flags & DBUF_DMCS) == 0) 593 aprint_error_dev(sc->sc_dev, "done unalloc rbuf\n"); 594 595 len = (arg & DMC_CCOUNT) - sizeof (struct dmc_header); 596 if (len < 0 || len > DMCMTU) { 597 ifp->if_ierrors++; 598 #ifdef DMCDEBUG 599 printd("%s: bad rcv pkt addr 0x%x len 0x%x\n", 600 device_xname(sc->sc_dev), pkaddr, len); 601 #endif 602 goto setup; 603 } 604 /* 605 * Deal with trailer protocol: if type is trailer 606 * get true type from first 16-bit word past data. 607 * Remember that type was trailer by setting off. 608 */ 609 dh = (struct dmc_header *)ifrw->ifrw_addr; 610 dh->dmc_type = ntohs((u_short)dh->dmc_type); 611 if (len == 0) 612 goto setup; 613 614 /* 615 * Pull packet off interface. Off is nonzero if 616 * packet has trailing header; dmc_get will then 617 * force this header information to be at the front, 618 * but we still have to drop the type and length 619 * which are at the front of any trailer data. 620 */ 621 m = if_ubaget(&sc->sc_ifuba, ifrw, ifp, len); 622 if (m == 0) 623 goto setup; 624 /* Shave off dmc_header */ 625 m_adj(m, sizeof(struct dmc_header)); 626 switch (dh->dmc_type) { 627 628 #ifdef INET 629 case DMC_IPTYPE: 630 schednetisr(NETISR_IP); 631 inq = &ipintrq; 632 break; 633 #endif 634 default: 635 m_freem(m); 636 goto setup; 637 } 638 639 s = splnet(); 640 if (IF_QFULL(inq)) { 641 IF_DROP(inq); 642 m_freem(m); 643 } else 644 IF_ENQUEUE(inq, m); 645 splx(s); 646 647 setup: 648 /* is this needed? */ 649 rp->ubinfo = ifrw->ifrw_info; 650 651 dmcload(sc, DMC_READ, rp->ubinfo, 652 ((rp->ubinfo >> 2) & DMC_XMEM) | rp->cc); 653 break; 654 655 case DMC_OUX: 656 /* 657 * A write has completed, start another 658 * transfer if there is more data to send. 659 */ 660 ifp->if_opackets++; 661 /* find associated dmcbuf structure */ 662 ifxp = &sc->sc_ifw[0]; 663 for (rp = &sc->sc_xbufs[0]; rp < &sc->sc_xbufs[NXMT]; rp++) { 664 if(rp->ubinfo == pkaddr) 665 break; 666 ifxp++; 667 } 668 if (rp >= &sc->sc_xbufs[NXMT]) { 669 aprint_error_dev(sc->sc_dev, "bad packet address 0x%x\n", 670 pkaddr); 671 break; 672 } 673 if ((rp->flags & DBUF_DMCS) == 0) 674 aprint_error_dev(sc->sc_dev, "unallocated packet 0x%x\n", 675 pkaddr); 676 /* mark buffer free */ 677 if_ubaend(&sc->sc_ifuba, ifxp); 678 rp->flags &= ~DBUF_DMCS; 679 if (--sc->sc_oused == 0) 680 sc->sc_if.if_timer = 0; 681 else 682 sc->sc_if.if_timer = dmc_timeout; 683 if ((sc->sc_flag & DMC_ONLINE) == 0) { 684 extern int ifqmaxlen; 685 686 /* 687 * We're on the air. 688 * Open the queue to the usual value. 689 */ 690 sc->sc_flag |= DMC_ONLINE; 691 ifp->if_snd.ifq_maxlen = ifqmaxlen; 692 } 693 break; 694 695 case DMC_CNTLO: 696 arg &= DMC_CNTMASK; 697 if (arg & DMC_FATAL) { 698 if (arg != DMC_START) { 699 snprintb(buf, sizeof(buf), CNTLO_BITS, 700 arg); 701 log(LOG_ERR, 702 "%s: fatal error, flags=%s\n", 703 device_xname(sc->sc_dev), buf); 704 } 705 dmcrestart(sc); 706 break; 707 } 708 /* ACCUMULATE STATISTICS */ 709 switch(arg) { 710 case DMC_NOBUFS: 711 ifp->if_ierrors++; 712 if ((sc->sc_nobuf++ % DMC_RPNBFS) == 0) 713 goto report; 714 break; 715 case DMC_DISCONN: 716 if ((sc->sc_disc++ % DMC_RPDSC) == 0) 717 goto report; 718 break; 719 case DMC_TIMEOUT: 720 if ((sc->sc_timeo++ % DMC_RPTMO) == 0) 721 goto report; 722 break; 723 case DMC_DATACK: 724 ifp->if_oerrors++; 725 if ((sc->sc_datck++ % DMC_RPDCK) == 0) 726 goto report; 727 break; 728 default: 729 goto report; 730 } 731 break; 732 report: 733 #ifdef DMCDEBUG 734 snprintb(buf, sizeof(buf), CNTLO_BITS, arg); 735 printd("%s: soft error, flags=%s\n", 736 device_xname(sc->sc_dev), buf); 737 #endif 738 if ((sc->sc_flag & DMC_RESTART) == 0) { 739 /* 740 * kill off the dmc to get things 741 * going again by generating a 742 * procedure error 743 */ 744 sc->sc_flag |= DMC_RESTART; 745 arg = sc->sc_ui.ui_baddr; 746 dmcload(sc, DMC_BASEI, arg, (arg>>2)&DMC_XMEM); 747 } 748 break; 749 750 default: 751 printf("%s: bad control %o\n", 752 device_xname(sc->sc_dev), cmd); 753 break; 754 } 755 } 756 dmcstart(ifp); 757 } 758 759 /* 760 * DMC output routine. 761 * Encapsulate a packet of type family for the dmc. 762 * Use trailer local net encapsulation if enough data in first 763 * packet leaves a multiple of 512 bytes of data in remainder. 764 */ 765 int 766 dmcoutput(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, 767 struct rtentry *rt) 768 { 769 int type, error, s; 770 struct mbuf *m = m0; 771 struct dmc_header *dh; 772 ALTQ_DECL(struct altq_pktattr pktattr;) 773 774 if ((ifp->if_flags & IFF_UP) == 0) { 775 error = ENETDOWN; 776 goto bad; 777 } 778 779 IFQ_CLASSIFY(&ifp->if_snd, m, dst->sa_family, &pktattr); 780 781 switch (dst->sa_family) { 782 #ifdef INET 783 case AF_INET: 784 type = DMC_IPTYPE; 785 break; 786 #endif 787 788 case AF_UNSPEC: 789 dh = (struct dmc_header *)dst->sa_data; 790 type = dh->dmc_type; 791 break; 792 793 default: 794 printf("%s: can't handle af%d\n", ifp->if_xname, 795 dst->sa_family); 796 error = EAFNOSUPPORT; 797 goto bad; 798 } 799 800 /* 801 * Add local network header 802 * (there is space for a uba on a vax to step on) 803 */ 804 M_PREPEND(m, sizeof(struct dmc_header), M_DONTWAIT); 805 if (m == 0) { 806 error = ENOBUFS; 807 goto bad; 808 } 809 dh = mtod(m, struct dmc_header *); 810 dh->dmc_type = htons((u_short)type); 811 812 /* 813 * Queue message on interface, and start output if interface 814 * not yet active. 815 */ 816 s = splnet(); 817 IFQ_ENQUEUE(&ifp->if_snd, m, &pktattr, error); 818 if (error) { 819 /* mbuf is already freed */ 820 splx(s); 821 return (error); 822 } 823 dmcstart(ifp); 824 splx(s); 825 return (0); 826 827 bad: 828 m_freem(m0); 829 return (error); 830 } 831 832 833 /* 834 * Process an ioctl request. 835 */ 836 /* ARGSUSED */ 837 int 838 dmcioctl(struct ifnet *ifp, u_long cmd, void *data) 839 { 840 int s = splnet(), error = 0; 841 register struct dmc_softc *sc = ifp->if_softc; 842 843 switch (cmd) { 844 845 case SIOCINITIFADDR: 846 ifp->if_flags |= IFF_UP; 847 if ((ifp->if_flags & IFF_RUNNING) == 0) 848 dmcinit(ifp); 849 break; 850 851 case SIOCSIFDSTADDR: 852 if ((ifp->if_flags & IFF_RUNNING) == 0) 853 dmcinit(ifp); 854 break; 855 856 case SIOCSIFFLAGS: 857 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 858 break; 859 if ((ifp->if_flags & IFF_UP) == 0 && 860 sc->sc_flag & DMC_RUNNING) 861 dmcdown(sc); 862 else if (ifp->if_flags & IFF_UP && 863 (sc->sc_flag & DMC_RUNNING) == 0) 864 dmcrestart(sc); 865 break; 866 867 default: 868 error = ifioctl_common(ifp, cmd, data); 869 } 870 splx(s); 871 return (error); 872 } 873 874 /* 875 * Restart after a fatal error. 876 * Clear device and reinitialize. 877 */ 878 void 879 dmcrestart(struct dmc_softc *sc) 880 { 881 int s, i; 882 883 #ifdef DMCDEBUG 884 /* dump base table */ 885 printf("%s base table:\n", device_xname(sc->sc_dev)); 886 for (i = 0; i < sizeof (struct dmc_base); i++) 887 printf("%o\n" ,dmc_base[unit].d_base[i]); 888 #endif 889 890 dmcdown(sc); 891 892 /* 893 * Let the DMR finish the MCLR. At 1 Mbit, it should do so 894 * in about a max of 6.4 milliseconds with diagnostics enabled. 895 */ 896 for (i = 100000; i && (DMC_RBYTE(DMC_BSEL1) & DMC_RUN) == 0; i--) 897 ; 898 /* Did the timer expire or did the DMR finish? */ 899 if ((DMC_RBYTE(DMC_BSEL1) & DMC_RUN) == 0) { 900 log(LOG_ERR, "%s: M820 Test Failed\n", device_xname(sc->sc_dev)); 901 return; 902 } 903 904 /* restart DMC */ 905 dmcinit(&sc->sc_if); 906 sc->sc_flag &= ~DMC_RESTART; 907 s = splnet(); 908 dmcstart(&sc->sc_if); 909 splx(s); 910 sc->sc_if.if_collisions++; /* why not? */ 911 } 912 913 /* 914 * Reset a device and mark down. 915 * Flush output queue and drop queue limit. 916 */ 917 void 918 dmcdown(struct dmc_softc *sc) 919 { 920 struct ifxmt *ifxp; 921 922 DMC_WBYTE(DMC_BSEL1, DMC_MCLR); 923 sc->sc_flag &= ~(DMC_RUNNING | DMC_ONLINE); 924 925 for (ifxp = sc->sc_ifw; ifxp < &sc->sc_ifw[NXMT]; ifxp++) { 926 #ifdef notyet 927 if (ifxp->ifw_xtofree) { 928 (void) m_freem(ifxp->ifw_xtofree); 929 ifxp->ifw_xtofree = 0; 930 } 931 #endif 932 } 933 IF_PURGE(&sc->sc_if.if_snd); 934 } 935 936 /* 937 * Watchdog timeout to see that transmitted packets don't 938 * lose interrupts. The device has to be online (the first 939 * transmission may block until the other side comes up). 940 */ 941 void 942 dmctimeout(struct ifnet *ifp) 943 { 944 struct dmc_softc *sc = ifp->if_softc; 945 char buf1[64], buf2[64]; 946 947 if (sc->sc_flag & DMC_ONLINE) { 948 snprintb(buf1, sizeof(buf1), DMC0BITS, 949 DMC_RBYTE(DMC_BSEL0) & 0xff); 950 snprintb(buf2, sizeof(buf2), DMC2BITS, 951 DMC_RBYTE(DMC_BSEL2) & 0xff); 952 log(LOG_ERR, "%s: output timeout, bsel0=%s bsel2=%s\n", 953 device_xname(sc->sc_dev), buf1, buf2); 954 dmcrestart(sc); 955 } 956 } 957
Indexes created Mon Sep 29 21:09:56 GMT 2025