if_ec.c revision 1.34.4.1
1 /* $NetBSD: if_ec.c,v 1.34.4.1 2020/02/29 20:18:31 ad Exp $ */ 2 3 /* 4 * Copyright (c) 2001 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Matthew Fredette. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * 3Com 3C400 device driver 34 */ 35 36 #include <sys/cdefs.h> 37 __KERNEL_RCSID(0, "$NetBSD: if_ec.c,v 1.34.4.1 2020/02/29 20:18:31 ad Exp $"); 38 39 #include "opt_inet.h" 40 #include "opt_ns.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/errno.h> 45 #include <sys/ioctl.h> 46 #include <sys/mbuf.h> 47 #include <sys/socket.h> 48 #include <sys/syslog.h> 49 #include <sys/device.h> 50 #include <sys/endian.h> 51 #include <sys/rndsource.h> 52 53 #include <net/if.h> 54 #include <net/if_dl.h> 55 #include <net/if_types.h> 56 #include <net/if_ether.h> 57 #include <net/if_media.h> 58 #include <net/bpf.h> 59 60 #ifdef INET 61 #include <netinet/in.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/in_var.h> 64 #include <netinet/ip.h> 65 #include <netinet/if_inarp.h> 66 #endif 67 68 #include <machine/cpu.h> 69 #include <machine/autoconf.h> 70 #include <machine/idprom.h> 71 #include <machine/bus.h> 72 #include <machine/intr.h> 73 74 #include <sun2/dev/if_ecreg.h> 75 76 /* 77 * Interface softc. 78 */ 79 struct ec_softc { 80 device_t sc_dev; 81 void *sc_ih; 82 83 struct ethercom sc_ethercom; /* ethernet common */ 84 struct ifmedia sc_media; /* our supported media */ 85 86 bus_space_tag_t sc_iot; /* bus space tag */ 87 bus_space_handle_t sc_ioh; /* bus space handle */ 88 89 u_char sc_jammed; /* nonzero if the net is jammed */ 90 u_char sc_colliding; /* nonzero if the net is colliding */ 91 uint32_t sc_backoff_seed; /* seed for the backoff PRNG */ 92 93 krndsource_t rnd_source; 94 }; 95 96 /* Macros to read and write the CSR. */ 97 #define ECREG_CSR_RD bus_space_read_2(sc->sc_iot, sc->sc_ioh, ECREG_CSR) 98 #define ECREG_CSR_WR(val) bus_space_write_2(sc->sc_iot, sc->sc_ioh, ECREG_CSR, val) 99 100 /* After this many collisions, the packet is dropped. */ 101 #define EC_COLLISIONS_JAMMED 16 102 103 /* 104 * Various constants used in the backoff pseudorandom 105 * number generator. 106 */ 107 #define EC_BACKOFF_PRNG_COLL_MAX 10 108 #define EC_BACKOFF_PRNG_MUL 1103515245 109 #define EC_BACKOFF_PRNG_ADD 12345 110 #define EC_BACKOFF_PRNG_MASK 0x7fffffff 111 112 /* 113 * Prototypes 114 */ 115 int ec_intr(void *); 116 void ec_reset(struct ifnet *); 117 int ec_init(struct ifnet *); 118 int ec_ioctl(struct ifnet *, u_long, void *); 119 void ec_watchdog(struct ifnet *); 120 void ec_start(struct ifnet *); 121 122 void ec_recv(struct ec_softc *, int); 123 void ec_coll(struct ec_softc *); 124 void ec_copyin(struct ec_softc *, void *, int, size_t); 125 void ec_copyout(struct ec_softc *, const void *, int, size_t); 126 127 int ec_mediachange(struct ifnet *); 128 void ec_mediastatus(struct ifnet *, struct ifmediareq *); 129 130 int ec_match(device_t, cfdata_t, void *); 131 void ec_attach(device_t, device_t, void *); 132 133 CFATTACH_DECL_NEW(ec, sizeof(struct ec_softc), 134 ec_match, ec_attach, NULL, NULL); 135 136 /* 137 * Copy board memory to kernel. 138 */ 139 void 140 ec_copyin(struct ec_softc *sc, void *p, int offset, size_t size) 141 { 142 143 bus_space_copyin(sc->sc_iot, sc->sc_ioh, offset, p, size); 144 } 145 146 /* 147 * Copy from kernel space to board memory. 148 */ 149 void 150 ec_copyout(struct ec_softc *sc, const void *p, int offset, size_t size) 151 { 152 153 bus_space_copyout(sc->sc_iot, sc->sc_ioh, offset, p, size); 154 } 155 156 int 157 ec_match(device_t parent, cfdata_t cf, void *aux) 158 { 159 struct mbmem_attach_args *mbma = aux; 160 bus_space_handle_t bh; 161 bool matched; 162 163 /* No default Multibus address. */ 164 if (mbma->mbma_paddr == -1) 165 return 0; 166 167 /* Make sure there is something there... */ 168 if (bus_space_map(mbma->mbma_bustag, mbma->mbma_paddr, ECREG_BANK_SZ, 169 0, &bh)) 170 return 0; 171 matched = (bus_space_peek_2(mbma->mbma_bustag, bh, 0, NULL) == 0); 172 bus_space_unmap(mbma->mbma_bustag, bh, ECREG_BANK_SZ); 173 if (!matched) 174 return 0; 175 176 /* Default interrupt priority. */ 177 if (mbma->mbma_pri == -1) 178 mbma->mbma_pri = 3; 179 180 return 1; 181 } 182 183 void 184 ec_attach(device_t parent, device_t self, void *aux) 185 { 186 struct ec_softc *sc = device_private(self); 187 struct mbmem_attach_args *mbma = aux; 188 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 189 uint8_t myaddr[ETHER_ADDR_LEN]; 190 191 sc->sc_dev = self; 192 193 aprint_normal("\n"); 194 195 /* Map in the board control regs. */ 196 sc->sc_iot = mbma->mbma_bustag; 197 if (bus_space_map(mbma->mbma_bustag, mbma->mbma_paddr, ECREG_BANK_SZ, 198 0, &sc->sc_ioh)) 199 panic("%s: can't map regs", __func__); 200 201 /* Reset the board. */ 202 ECREG_CSR_WR(EC_CSR_RESET); 203 delay(160); 204 205 /* 206 * Copy out the board ROM Ethernet address, 207 * and use the non-vendor-ID part to seed 208 * our backoff pseudorandom number generator. 209 */ 210 bus_space_read_region_1(sc->sc_iot, sc->sc_ioh, 211 ECREG_AROM, myaddr, ETHER_ADDR_LEN); 212 sc->sc_backoff_seed = 213 (myaddr[3] << 16) | (myaddr[4] << 8) | (myaddr[5]) | 1; 214 215 /* Initialize ifnet structure. */ 216 strcpy(ifp->if_xname, device_xname(self)); 217 ifp->if_softc = sc; 218 ifp->if_start = ec_start; 219 ifp->if_ioctl = ec_ioctl; 220 ifp->if_init = ec_init; 221 ifp->if_watchdog = ec_watchdog; 222 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX; 223 IFQ_SET_READY(&ifp->if_snd); 224 225 /* Initialize ifmedia structures. */ 226 sc->sc_ethercom.ec_ifmedia = &sc->sc_media; 227 ifmedia_init(&sc->sc_media, 0, ec_mediachange, ec_mediastatus); 228 ifmedia_add(&sc->sc_media, IFM_ETHER | IFM_MANUAL, 0, NULL); 229 ifmedia_set(&sc->sc_media, IFM_ETHER | IFM_MANUAL); 230 231 /* Now we can attach the interface. */ 232 if_attach(ifp); 233 if_deferred_start_init(ifp, NULL); 234 idprom_etheraddr(myaddr); 235 ether_ifattach(ifp, myaddr); 236 aprint_normal_dev(self, "address %s\n", ether_sprintf(myaddr)); 237 238 bus_intr_establish(mbma->mbma_bustag, mbma->mbma_pri, IPL_NET, 0, 239 ec_intr, sc); 240 241 rnd_attach_source(&sc->rnd_source, device_xname(self), 242 RND_TYPE_NET, RND_FLAG_DEFAULT); 243 } 244 245 /* 246 * Reset interface. 247 */ 248 void 249 ec_reset(struct ifnet *ifp) 250 { 251 int s; 252 253 s = splnet(); 254 ec_init(ifp); 255 splx(s); 256 } 257 258 259 /* 260 * Initialize interface. 261 */ 262 int 263 ec_init(struct ifnet *ifp) 264 { 265 struct ec_softc *sc = ifp->if_softc; 266 267 /* Reset the board. */ 268 ECREG_CSR_WR(EC_CSR_RESET); 269 delay(160); 270 271 /* Set the Ethernet address. */ 272 bus_space_write_region_1(sc->sc_iot, sc->sc_ioh, 273 ECREG_ARAM, CLLADDR(sc->sc_ethercom.ec_if.if_sadl), ETHER_ADDR_LEN); 274 ECREG_CSR_WR((ECREG_CSR_RD & EC_CSR_INTPA) | EC_CSR_AMSW); 275 ECREG_CSR_WR(ECREG_CSR_RD & 0); 276 277 /* Enable interrupts. */ 278 ECREG_CSR_WR((ECREG_CSR_RD & EC_CSR_INTPA) | 279 EC_CSR_BBSW | EC_CSR_ABSW | EC_CSR_BINT | EC_CSR_AINT | 280 (ifp->if_flags & IFF_PROMISC ? EC_CSR_PROMISC : EC_CSR_PA)); 281 282 /* Set flags appropriately. */ 283 ifp->if_flags |= IFF_RUNNING; 284 ifp->if_flags &= ~IFF_OACTIVE; 285 286 /* Start output. */ 287 ec_start(ifp); 288 289 return 0; 290 } 291 292 /* 293 * Start output on interface. 294 */ 295 void 296 ec_start(struct ifnet *ifp) 297 { 298 struct ec_softc *sc = ifp->if_softc; 299 struct mbuf *m, *m0; 300 int s; 301 u_int count, realcount; 302 bus_size_t off; 303 static uint8_t padding[ETHER_MIN_LEN - ETHER_CRC_LEN] = {0}; 304 305 s = splnet(); 306 307 /* Don't do anything if output is active. */ 308 if ((ifp->if_flags & IFF_OACTIVE) != 0) { 309 splx(s); 310 return; 311 } 312 /* Don't do anything if the output queue is empty. */ 313 IFQ_DEQUEUE(&ifp->if_snd, m0); 314 if (m0 == NULL) { 315 splx(s); 316 return; 317 } 318 319 /* The BPF tap. */ 320 bpf_mtap(ifp, m0, BPF_D_OUT); 321 322 /* Size the packet. */ 323 count = EC_BUF_SZ - m0->m_pkthdr.len; 324 325 /* Copy the packet into the xmit buffer. */ 326 realcount = MIN(count, EC_PKT_MAXTDOFF); 327 bus_space_write_2(sc->sc_iot, sc->sc_ioh, ECREG_TBUF, realcount); 328 for (off = realcount, m = m0; m != 0; off += m->m_len, m = m->m_next) 329 ec_copyout(sc, mtod(m, uint8_t *), ECREG_TBUF + off, m->m_len); 330 m_freem(m0); 331 if (count - realcount) 332 ec_copyout(sc, padding, ECREG_TBUF + off, count - realcount); 333 334 /* Enable the transmitter. */ 335 ECREG_CSR_WR((ECREG_CSR_RD & EC_CSR_PA) | 336 EC_CSR_TBSW | EC_CSR_TINT | EC_CSR_JINT); 337 ifp->if_flags |= IFF_OACTIVE; 338 339 /* Done. */ 340 splx(s); 341 } 342 343 /* 344 * Controller interrupt. 345 */ 346 int 347 ec_intr(void *arg) 348 { 349 struct ec_softc *sc = arg; 350 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 351 int recv_first; 352 int recv_second; 353 int retval; 354 355 retval = 0; 356 357 /* Check for received packet(s). */ 358 recv_first = recv_second = 0; 359 switch (ECREG_CSR_RD & (EC_CSR_BBSW | EC_CSR_ABSW | EC_CSR_RBBA)) { 360 361 case (EC_CSR_BBSW | EC_CSR_ABSW): 362 case (EC_CSR_BBSW | EC_CSR_ABSW | EC_CSR_RBBA): 363 /* Neither buffer is full. Is this a transmit interrupt? 364 * Acknowledge the interrupt ourselves. */ 365 ECREG_CSR_WR(ECREG_CSR_RD & 366 (EC_CSR_TINT | EC_CSR_JINT | EC_CSR_PAMASK)); 367 ECREG_CSR_WR((ECREG_CSR_RD & EC_CSR_INTPA) | 368 EC_CSR_BINT | EC_CSR_AINT); 369 break; 370 371 case EC_CSR_BBSW: 372 case (EC_CSR_BBSW | EC_CSR_RBBA): 373 /* Only the A buffer is full. */ 374 recv_first = EC_CSR_AINT; 375 break; 376 377 case EC_CSR_ABSW: 378 case (EC_CSR_ABSW | EC_CSR_RBBA): 379 /* Only the B buffer is full. */ 380 recv_first = EC_CSR_BINT; 381 break; 382 383 case 0: 384 /* Both the A buffer and the B buffer are full, and the A 385 * buffer is older than the B buffer. */ 386 recv_first = EC_CSR_AINT; 387 recv_second = EC_CSR_BINT; 388 break; 389 390 case EC_CSR_RBBA: 391 /* Both the A buffer and the B buffer are full, and the B 392 * buffer is older than the A buffer. */ 393 recv_first = EC_CSR_BINT; 394 recv_second = EC_CSR_AINT; 395 break; 396 } 397 398 /* Receive packets. */ 399 if (recv_first) { 400 401 /* Acknowledge the interrupt. */ 402 ECREG_CSR_WR(ECREG_CSR_RD & 403 ((EC_CSR_BINT | EC_CSR_AINT | EC_CSR_TINT | EC_CSR_JINT | 404 EC_CSR_PAMASK) ^ (recv_first | recv_second))); 405 406 /* Receive a packet. */ 407 ec_recv(sc, recv_first); 408 409 /* Receive a packet. */ 410 if (recv_second) 411 ec_recv(sc, recv_second); 412 413 retval++; 414 } 415 /* Check for a transmitted packet. */ 416 if (ifp->if_flags & IFF_OACTIVE) { 417 418 /* If we got a collision. */ 419 if (ECREG_CSR_RD & EC_CSR_JAM) { 420 ECREG_CSR_WR(ECREG_CSR_RD & 421 (EC_CSR_BINT | EC_CSR_AINT | EC_CSR_PAMASK)); 422 if_statinc(ifp, if_collisions); 423 retval++; 424 ec_coll(sc); 425 426 } 427 /* If we transmitted a packet. */ 428 else if ((ECREG_CSR_RD & EC_CSR_TBSW) == 0) { 429 ECREG_CSR_WR(ECREG_CSR_RD & 430 (EC_CSR_BINT | EC_CSR_AINT | EC_CSR_PAMASK)); 431 retval++; 432 if_statinc(ifp, if_opackets); 433 sc->sc_jammed = 0; 434 ifp->if_flags &= ~IFF_OACTIVE; 435 if_schedule_deferred_start(ifp); 436 } 437 } else { 438 439 /* Make sure we disable transmitter interrupts. */ 440 ECREG_CSR_WR(ECREG_CSR_RD & 441 (EC_CSR_BINT | EC_CSR_AINT | EC_CSR_PAMASK)); 442 } 443 444 return retval; 445 } 446 447 /* 448 * Read in a packet from the board. 449 */ 450 void 451 ec_recv(struct ec_softc *sc, int intbit) 452 { 453 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 454 struct mbuf *m0, *m, *newm; 455 bus_size_t buf; 456 uint16_t status; 457 uint16_t doff; 458 int length, total_length; 459 460 buf = EC_CSR_INT_BUF(intbit); 461 462 /* Read in the packet status. */ 463 status = bus_space_read_2(sc->sc_iot, sc->sc_ioh, buf); 464 doff = status & EC_PKT_DOFF; 465 466 for (total_length = -1, m0 = NULL;;) { 467 468 /* Check for an error. */ 469 if (status & (EC_PKT_FCSERR | EC_PKT_RGERR | EC_PKT_FRERR) || 470 doff < EC_PKT_MINRDOFF || 471 doff > EC_PKT_MAXRDOFF) { 472 printf("%s: garbled packet, status 0x%04x; dropping\n", 473 device_xname(sc->sc_dev), (unsigned int)status); 474 break; 475 } 476 477 /* Adjust for the header. */ 478 total_length = doff - EC_PKT_RDOFF; 479 buf += EC_PKT_RDOFF; 480 481 /* XXX - sometimes the card reports a large data offset. */ 482 if (total_length > (ETHER_MAX_LEN - ETHER_CRC_LEN)) { 483 #ifdef DEBUG 484 printf("%s: fixing too-large length of %d\n", 485 device_xname(sc->sc_dev), total_length); 486 #endif 487 total_length = (ETHER_MAX_LEN - ETHER_CRC_LEN); 488 } 489 490 MGETHDR(m0, M_DONTWAIT, MT_DATA); 491 if (m0 == NULL) 492 break; 493 m_set_rcvif(m0, ifp); 494 m0->m_pkthdr.len = total_length; 495 length = MHLEN; 496 m = m0; 497 498 while (total_length > 0) { 499 if (total_length >= MINCLSIZE) { 500 MCLGET(m, M_DONTWAIT); 501 if ((m->m_flags & M_EXT) == 0) 502 break; 503 length = MCLBYTES; 504 } 505 m->m_len = length = uimin(total_length, length); 506 ec_copyin(sc, mtod(m, uint8_t *), buf, length); 507 total_length -= length; 508 buf += length; 509 510 if (total_length > 0) { 511 MGET(newm, M_DONTWAIT, MT_DATA); 512 if (newm == NULL) 513 break; 514 length = MLEN; 515 m = m->m_next = newm; 516 } 517 } 518 break; 519 } 520 521 if (total_length == 0) { 522 /* Pass the packet up. */ 523 if_percpuq_enqueue(ifp->if_percpuq, m0); 524 525 } else { 526 /* Something went wrong. */ 527 if (m0 != NULL) 528 m_freem(m0); 529 if_statinc(ifp, if_ierrors); 530 } 531 532 /* Give the receive buffer back to the card. */ 533 buf = EC_CSR_INT_BUF(intbit); 534 bus_space_write_2(sc->sc_iot, sc->sc_ioh, buf, 0); 535 ECREG_CSR_WR((ECREG_CSR_RD & EC_CSR_INTPA) | 536 EC_CSR_INT_BSW(intbit) | intbit); 537 } 538 539 int 540 ec_mediachange(struct ifnet *ifp) 541 { 542 543 return 0; 544 } 545 546 void 547 ec_mediastatus(struct ifnet *ifp, struct ifmediareq *ifmr) 548 { 549 550 if ((ifp->if_flags & IFF_UP) == 0) 551 return; 552 553 ifmr->ifm_status = IFM_AVALID | IFM_ACTIVE; 554 } 555 556 /* 557 * Process an ioctl request. This code needs some work - it looks pretty ugly. 558 */ 559 int 560 ec_ioctl(struct ifnet *ifp, u_long cmd, void *data) 561 { 562 struct ifaddr *ifa = (struct ifaddr *)data; 563 int s, error = 0; 564 565 s = splnet(); 566 567 switch (cmd) { 568 569 case SIOCINITIFADDR: 570 ifp->if_flags |= IFF_UP; 571 572 switch (ifa->ifa_addr->sa_family) { 573 #ifdef INET 574 case AF_INET: 575 ec_init(ifp); 576 arp_ifinit(ifp, ifa); 577 break; 578 #endif 579 default: 580 ec_init(ifp); 581 break; 582 } 583 break; 584 585 case SIOCSIFFLAGS: 586 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 587 break; 588 switch (ifp->if_flags & (IFF_UP | IFF_RUNNING)) { 589 case IFF_RUNNING: 590 /* 591 * If interface is marked down and it is running, then 592 * stop it. 593 */ 594 ifp->if_flags &= ~IFF_RUNNING; 595 break; 596 case IFF_UP: 597 /* 598 * If interface is marked up and it is stopped, then 599 * start it. 600 */ 601 ec_init(ifp); 602 break; 603 default: 604 /* 605 * Some other important flag might have changed, so 606 * reset. 607 */ 608 ec_reset(ifp); 609 break; 610 } 611 break; 612 613 default: 614 error = ether_ioctl(ifp, cmd, data); 615 break; 616 } 617 618 splx(s); 619 return error; 620 } 621 622 /* 623 * Collision routine. 624 */ 625 void 626 ec_coll(struct ec_softc *sc) 627 { 628 struct ifnet *ifp = &sc->sc_ethercom.ec_if; 629 u_short jams; 630 631 if ((++sc->sc_colliding) >= EC_COLLISIONS_JAMMED) { 632 if_statinc(ifp, if_oerrors); 633 if (!sc->sc_jammed) 634 printf("%s: ethernet jammed\n", 635 device_xname(sc->sc_dev)); 636 sc->sc_jammed = 1; 637 sc->sc_colliding = 0; 638 ifp->if_flags &= ~IFF_OACTIVE; 639 if_schedule_deferred_start(ifp); 640 } else { 641 jams = MAX(sc->sc_colliding, EC_BACKOFF_PRNG_COLL_MAX); 642 sc->sc_backoff_seed = 643 ((sc->sc_backoff_seed * EC_BACKOFF_PRNG_MUL) + 644 EC_BACKOFF_PRNG_ADD) & EC_BACKOFF_PRNG_MASK; 645 bus_space_write_2(sc->sc_iot, sc->sc_ioh, ECREG_BACKOFF, 646 -(((sc->sc_backoff_seed >> 8) & ~(-1 << jams)) + 1)); 647 ECREG_CSR_WR((ECREG_CSR_RD & EC_CSR_INTPA) | 648 EC_CSR_JAM | EC_CSR_TINT | EC_CSR_JINT); 649 } 650 } 651 652 /* 653 * Device timeout routine. 654 */ 655 void 656 ec_watchdog(struct ifnet *ifp) 657 { 658 struct ec_softc *sc = ifp->if_softc; 659 660 log(LOG_ERR, "%s: device timeout\n", device_xname(sc->sc_dev)); 661 if_statinc(ifp, if_oerrors); 662 663 ec_reset(ifp); 664 } 665
Indexes created Wed Oct 01 13:09:50 GMT 2025