smc90cx6.c revision 108470
1/* $NetBSD: smc90cx6.c,v 1.38 2001/07/07 15:57:53 thorpej Exp $ */ 2/* $FreeBSD: head/sys/dev/cm/smc90cx6.c 108470 2002-12-30 21:18:15Z schweikh $ */ 3 4/*- 5 * Copyright (c) 1994, 1995, 1998 The NetBSD Foundation, Inc. 6 * All rights reserved. 7 * 8 * This code is derived from software contributed to The NetBSD Foundation 9 * by Ignatios Souvatzis. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40/* 41 * Chip core driver for the SMC90c26 / SMC90c56 (and SMC90c66 in '56 42 * compatibility mode) boards 43 */ 44 45/* #define CMSOFTCOPY */ 46#define CMRETRANSMIT /**/ 47#undef CM_DEBUG 48 49#include <sys/param.h> 50#include <sys/systm.h> 51#include <sys/sockio.h> 52#include <sys/mbuf.h> 53#include <sys/module.h> 54#include <sys/kernel.h> 55#include <sys/socket.h> 56#include <sys/syslog.h> 57#include <sys/bus.h> 58 59#include <machine/bus.h> 60#include <sys/rman.h> 61#include <machine/resource.h> 62 63#if __FreeBSD_version < 500000 64#include <machine/clock.h> 65#endif 66 67#include <net/if.h> 68#include <net/if_dl.h> 69#include <net/if_types.h> 70#include <net/if_arc.h> 71#include <net/bpf.h> 72 73#if 0 74#if NBPFILTER > 0 75#include <net/bpfdesc.h> 76#endif 77#endif 78 79#include <dev/cm/smc90cx6reg.h> 80#include <dev/cm/smc90cx6var.h> 81 82MODULE_DEPEND(if_cm, arcnet, 1, 1, 1); 83 84/* these should be elsewhere */ 85 86#define ARC_MIN_LEN 1 87#define ARC_MIN_FORBID_LEN 254 88#define ARC_MAX_FORBID_LEN 256 89#define ARC_MAX_LEN 508 90#define ARC_ADDR_LEN 1 91 92/* for watchdog timer. This should be more than enough. */ 93#define ARCTIMEOUT (5*IFNET_SLOWHZ) 94 95/* short notation */ 96 97#define GETREG(off) \ 98 bus_space_read_1(rman_get_bustag((sc)->port_res), \ 99 rman_get_bushandle((sc)->port_res), \ 100 (off)) 101#define PUTREG(off, value) \ 102 bus_space_write_1(rman_get_bustag((sc)->port_res), \ 103 rman_get_bushandle((sc)->port_res), \ 104 (off), (value)) 105#define GETMEM(off) \ 106 bus_space_read_1(rman_get_bustag((sc)->mem_res), \ 107 rman_get_bushandle((sc)->mem_res), \ 108 (off)) 109#define PUTMEM(off, value) \ 110 bus_space_write_1(rman_get_bustag((sc)->mem_res), \ 111 rman_get_bushandle((sc)->mem_res), \ 112 (off), (value)) 113 114devclass_t cm_devclass; 115 116/* 117 * This currently uses 2 bufs for tx, 2 for rx 118 * 119 * New rx protocol: 120 * 121 * rx has a fillcount variable. If fillcount > (NRXBUF-1), 122 * rx can be switched off from rx hard int. 123 * Else rx is restarted on the other receiver. 124 * rx soft int counts down. if it is == (NRXBUF-1), it restarts 125 * the receiver. 126 * To ensure packet ordering (we need that for 1201 later), we have a counter 127 * which is incremented modulo 256 on each receive and a per buffer 128 * variable, which is set to the counter on filling. The soft int can 129 * compare both values to determine the older packet. 130 * 131 * Transmit direction: 132 * 133 * cm_start checks tx_fillcount 134 * case 2: return 135 * 136 * else fill tx_act ^ 1 && inc tx_fillcount 137 * 138 * check tx_fillcount again. 139 * case 2: set IFF_OACTIVE to stop arc_output from filling us. 140 * case 1: start tx 141 * 142 * tint clears IFF_OCATIVE, decrements and checks tx_fillcount 143 * case 1: start tx on tx_act ^ 1, softcall cm_start 144 * case 0: softcall cm_start 145 * 146 * #define fill(i) get mbuf && copy mbuf to chip(i) 147 */ 148 149void cm_init(void *); 150void cm_reset(struct cm_softc *); 151void cm_start(struct ifnet *); 152int cm_ioctl(struct ifnet *, unsigned long, caddr_t); 153void cm_watchdog(struct ifnet *); 154void cm_srint(void *vsc); 155static void cm_tint(struct cm_softc *, int); 156void cm_reconwatch(void *); 157 158int 159cm_probe(dev) 160 device_t dev; 161{ 162 int error; 163 struct cm_softc *sc = device_get_softc(dev); 164 165 error = cm_alloc_port(dev, 0, CM_IO_PORTS); 166 if (error) 167 return error; 168 169 if (GETREG(CMSTAT) == 0xff) 170 return ENXIO; 171 172 error = cm_alloc_memory(dev, 0, 0x800); 173 if (error) 174 return error; 175 176 return 0; 177} 178 179/* 180 * Allocate a port resource with the given resource id. 181 */ 182int 183cm_alloc_port(dev, rid, size) 184 device_t dev; 185 int rid; 186 int size; 187{ 188 struct cm_softc *sc = device_get_softc(dev); 189 struct resource *res; 190 191 res = bus_alloc_resource(dev, SYS_RES_IOPORT, &rid, 192 0ul, ~0ul, size, RF_ACTIVE); 193 if (res) { 194 sc->port_rid = rid; 195 sc->port_res = res; 196 sc->port_used = size; 197 return (0); 198 } else { 199 return (ENOENT); 200 } 201} 202 203/* 204 * Allocate a memory resource with the given resource id. 205 */ 206int 207cm_alloc_memory(dev, rid, size) 208 device_t dev; 209 int rid; 210 int size; 211{ 212 struct cm_softc *sc = device_get_softc(dev); 213 struct resource *res; 214 215 res = bus_alloc_resource(dev, SYS_RES_MEMORY, &rid, 216 0ul, ~0ul, size, RF_ACTIVE); 217 if (res) { 218 sc->mem_rid = rid; 219 sc->mem_res = res; 220 sc->mem_used = size; 221 return (0); 222 } else { 223 return (ENOENT); 224 } 225} 226 227/* 228 * Allocate an irq resource with the given resource id. 229 */ 230int 231cm_alloc_irq(dev, rid) 232 device_t dev; 233 int rid; 234{ 235 struct cm_softc *sc = device_get_softc(dev); 236 struct resource *res; 237 238 res = bus_alloc_resource(dev, SYS_RES_IRQ, &rid, 239 0ul, ~0ul, 1, RF_ACTIVE); 240 if (res) { 241 sc->irq_rid = rid; 242 sc->irq_res = res; 243 return (0); 244 } else { 245 return (ENOENT); 246 } 247} 248 249/* 250 * Release all resources 251 */ 252void 253cm_release_resources(dev) 254 device_t dev; 255{ 256 struct cm_softc *sc = device_get_softc(dev); 257 258 if (sc->port_res) { 259 bus_deactivate_resource(dev, SYS_RES_IOPORT, 260 sc->port_rid, sc->port_res); 261 bus_release_resource(dev, SYS_RES_IOPORT, 262 sc->port_rid, sc->port_res); 263 sc->port_res = 0; 264 } 265 if (sc->mem_res) { 266 bus_deactivate_resource(dev, SYS_RES_MEMORY, 267 sc->mem_rid, sc->mem_res); 268 bus_release_resource(dev, SYS_RES_MEMORY, 269 sc->mem_rid, sc->mem_res); 270 sc->mem_res = 0; 271 } 272 if (sc->irq_res) { 273 bus_deactivate_resource(dev, SYS_RES_IRQ, 274 sc->irq_rid, sc->irq_res); 275 bus_release_resource(dev, SYS_RES_IRQ, 276 sc->irq_rid, sc->irq_res); 277 sc->irq_res = 0; 278 } 279} 280 281int 282cm_attach(sc, unit) 283 struct cm_softc *sc; 284 int unit; 285{ 286 struct ifnet *ifp = &sc->sc_arccom.ac_if; 287 int s; 288 u_int8_t linkaddress; 289 290 s = splhigh(); 291 292 /* 293 * read the arcnet address from the board 294 */ 295 296 GETREG(CMRESET); 297 do { 298 DELAY(200); 299 } while (!(GETREG(CMSTAT) & CM_POR)); 300 301 linkaddress = GETMEM(CMMACOFF); 302 303 /* clear the int mask... */ 304 305 sc->sc_intmask = 0; 306 PUTREG(CMSTAT, 0); 307 308 PUTREG(CMCMD, CM_CONF(CONF_LONG)); 309 PUTREG(CMCMD, CM_CLR(CLR_POR|CLR_RECONFIG)); 310 sc->sc_recontime = sc->sc_reconcount = 0; 311 312 /* and reenable kernel int level */ 313 splx(s); 314 315 /* 316 * set interface to stopped condition (reset) 317 */ 318 cm_stop(sc); 319 320 if (!ifp->if_name) { 321 ifp->if_softc = sc; 322 ifp->if_unit = unit; 323 ifp->if_name = "cm"; 324 ifp->if_output = arc_output; 325 ifp->if_start = cm_start; 326 ifp->if_ioctl = cm_ioctl; 327 ifp->if_watchdog = cm_watchdog; 328 ifp->if_init = cm_init; 329 /* XXX IFQ_SET_READY(&ifp->if_snd); */ 330 ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; 331 ifp->if_timer = 0; 332 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX; 333 334 arc_ifattach(ifp, linkaddress); 335 336#ifdef CMSOFTCOPY 337 sc->sc_rxcookie = softintr_establish(IPL_SOFTNET, cm_srint, sc); 338 sc->sc_txcookie = softintr_establish(IPL_SOFTNET, 339 (void (*)(void *))cm_start, ifp); 340#endif 341 342#if __FreeBSD_version < 500000 343 callout_init(&sc->sc_recon_ch); 344#else 345 callout_init(&sc->sc_recon_ch, 0); 346#endif 347 } 348 349 if_printf(ifp, "link addr 0x%02x(%d)\n", linkaddress, linkaddress); 350 return 0; 351} 352 353/* 354 * Initialize device 355 * 356 */ 357void 358cm_init(xsc) 359 void *xsc; 360{ 361 struct cm_softc *sc = (struct cm_softc *)xsc; 362 struct ifnet *ifp; 363 int s; 364 365 ifp = &sc->sc_arccom.ac_if; 366 367 if ((ifp->if_flags & IFF_RUNNING) == 0) { 368 s = splimp(); 369 ifp->if_flags |= IFF_RUNNING; 370 cm_reset(sc); 371 cm_start(ifp); 372 splx(s); 373 } 374} 375 376/* 377 * Reset the interface... 378 * 379 * this assumes that it is called inside a critical section... 380 * 381 */ 382void 383cm_reset(sc) 384 struct cm_softc *sc; 385{ 386 struct ifnet *ifp; 387 int linkaddress; 388 389 ifp = &sc->sc_arccom.ac_if; 390 391#ifdef CM_DEBUG 392 if_printf(ifp, "reset\n"); 393#endif 394 /* stop and restart hardware */ 395 396 GETREG(CMRESET); 397 do { 398 DELAY(200); 399 } while (!(GETREG(CMSTAT) & CM_POR)); 400 401 linkaddress = GETMEM(CMMACOFF); 402 403#if defined(CM_DEBUG) && (CM_DEBUG > 2) 404 if_printf(ifp, "reset: card reset, link addr = 0x%02x (%d)\n", 405 linkaddress, linkaddress); 406#endif 407 408 /* tell the routing level about the (possibly changed) link address */ 409 arc_storelladdr(ifp, linkaddress); 410 arc_frag_init(ifp); 411 412 /* POR is NMI, but we need it below: */ 413 sc->sc_intmask = CM_RECON|CM_POR; 414 PUTREG(CMSTAT, sc->sc_intmask); 415 PUTREG(CMCMD, CM_CONF(CONF_LONG)); 416 417#ifdef CM_DEBUG 418 if_printf(ifp, "reset: chip configured, status=0x%02x\n", 419 GETREG(CMSTAT)); 420#endif 421 PUTREG(CMCMD, CM_CLR(CLR_POR|CLR_RECONFIG)); 422 423#ifdef CM_DEBUG 424 if_printf(ifp, "reset: bits cleared, status=0x%02x\n", 425 GETREG(CMSTAT)); 426#endif 427 428 sc->sc_reconcount_excessive = ARC_EXCESSIVE_RECONS; 429 430 /* start receiver */ 431 432 sc->sc_intmask |= CM_RI; 433 sc->sc_rx_fillcount = 0; 434 sc->sc_rx_act = 2; 435 436 PUTREG(CMCMD, CM_RXBC(2)); 437 PUTREG(CMSTAT, sc->sc_intmask); 438 439#ifdef CM_DEBUG 440 if_printf(ifp, "reset: started receiver, status=0x%02x\n", 441 GETREG(CMSTAT)); 442#endif 443 444 /* and init transmitter status */ 445 sc->sc_tx_act = 0; 446 sc->sc_tx_fillcount = 0; 447 448 ifp->if_flags |= IFF_RUNNING; 449 ifp->if_flags &= ~IFF_OACTIVE; 450 451 cm_start(ifp); 452} 453 454/* 455 * Take interface offline 456 */ 457void 458cm_stop(sc) 459 struct cm_softc *sc; 460{ 461 /* Stop the interrupts */ 462 PUTREG(CMSTAT, 0); 463 464 /* Stop the interface */ 465 GETREG(CMRESET); 466 467 /* Stop watchdog timer */ 468 sc->sc_arccom.ac_if.if_timer = 0; 469} 470 471/* 472 * Start output on interface. Get another datagram to send 473 * off the interface queue, and copy it to the 474 * interface becore starting the output 475 * 476 * this assumes that it is called inside a critical section... 477 * XXX hm... does it still? 478 * 479 */ 480void 481cm_start(ifp) 482 struct ifnet *ifp; 483{ 484 struct cm_softc *sc = ifp->if_softc; 485 struct mbuf *m,*mp; 486 487 int cm_ram_ptr; 488 int len, tlen, offset, s, buffer; 489#ifdef CMTIMINGS 490 u_long copystart, lencopy, perbyte; 491#endif 492 493#if defined(CM_DEBUG) && (CM_DEBUG > 3) 494 if_printf(ifp, "start(%p)\n", ifp); 495#endif 496 497 if ((ifp->if_flags & IFF_RUNNING) == 0) 498 return; 499 500 s = splimp(); 501 502 if (sc->sc_tx_fillcount >= 2) { 503 splx(s); 504 return; 505 } 506 507 m = arc_frag_next(ifp); 508 buffer = sc->sc_tx_act ^ 1; 509 510 splx(s); 511 512 if (m == 0) 513 return; 514 515 /* 516 * If bpf is listening on this interface, let it 517 * see the packet before we commit it to the wire 518 * 519 * (can't give the copy in A2060 card RAM to bpf, because 520 * that RAM is just accessed as on every other byte) 521 */ 522 BPF_MTAP(ifp, m); 523 524#ifdef CM_DEBUG 525 if (m->m_len < ARC_HDRLEN) 526 m = m_pullup(m, ARC_HDRLEN);/* gcc does structure padding */ 527 if_printf(ifp, "start: filling %d from %d to %d type %d\n", 528 buffer, mtod(m, u_char *)[0], 529 mtod(m, u_char *)[1], mtod(m, u_char *)[2]); 530#else 531 if (m->m_len < 2) 532 m = m_pullup(m, 2); 533#endif 534 cm_ram_ptr = buffer*512; 535 536 if (m == 0) 537 return; 538 539 /* write the addresses to RAM and throw them away */ 540 541 /* 542 * Hardware does this: Yet Another Microsecond Saved. 543 * (btw, timing code says usually 2 microseconds) 544 * PUTMEM(cm_ram_ptr + 0, mtod(m, u_char *)[0]); 545 */ 546 547 PUTMEM(cm_ram_ptr + 1, mtod(m, u_char *)[1]); 548 m_adj(m, 2); 549 550 /* get total length left at this point */ 551 tlen = m->m_pkthdr.len; 552 if (tlen < ARC_MIN_FORBID_LEN) { 553 offset = 256 - tlen; 554 PUTMEM(cm_ram_ptr + 2, offset); 555 } else { 556 PUTMEM(cm_ram_ptr + 2, 0); 557 if (tlen <= ARC_MAX_FORBID_LEN) 558 offset = 255; /* !!! */ 559 else { 560 if (tlen > ARC_MAX_LEN) 561 tlen = ARC_MAX_LEN; 562 offset = 512 - tlen; 563 } 564 PUTMEM(cm_ram_ptr + 3, offset); 565 566 } 567 cm_ram_ptr += offset; 568 569 /* lets loop through the mbuf chain */ 570 571 for (mp = m; mp; mp = mp->m_next) { 572 if ((len = mp->m_len)) { /* YAMS */ 573 bus_space_write_region_1( 574 rman_get_bustag(sc->mem_res), 575 rman_get_bushandle(sc->mem_res), 576 cm_ram_ptr, mtod(mp, caddr_t), len); 577 578 cm_ram_ptr += len; 579 } 580 } 581 582 sc->sc_broadcast[buffer] = (m->m_flags & M_BCAST) != 0; 583 sc->sc_retransmits[buffer] = (m->m_flags & M_BCAST) ? 1 : 5; 584 585 /* actually transmit the packet */ 586 s = splimp(); 587 588 if (++sc->sc_tx_fillcount > 1) { 589 /* 590 * We are filled up to the rim. No more bufs for the moment, 591 * please. 592 */ 593 ifp->if_flags |= IFF_OACTIVE; 594 } else { 595#ifdef CM_DEBUG 596 if_printf(ifp, "start: starting transmitter on buffer %d\n", 597 buffer); 598#endif 599 /* Transmitter was off, start it */ 600 sc->sc_tx_act = buffer; 601 602 /* 603 * We still can accept another buf, so don't: 604 * ifp->if_flags |= IFF_OACTIVE; 605 */ 606 sc->sc_intmask |= CM_TA; 607 PUTREG(CMCMD, CM_TX(buffer)); 608 PUTREG(CMSTAT, sc->sc_intmask); 609 610 sc->sc_arccom.ac_if.if_timer = ARCTIMEOUT; 611 } 612 splx(s); 613 m_freem(m); 614 615 /* 616 * After 10 times reading the docs, I realized 617 * that in the case the receiver NAKs the buffer request, 618 * the hardware retries till shutdown. 619 * This is integrated now in the code above. 620 */ 621 622 return; 623} 624 625/* 626 * Arcnet interface receiver soft interrupt: 627 * get the stuff out of any filled buffer we find. 628 */ 629void 630cm_srint(vsc) 631 void *vsc; 632{ 633 struct cm_softc *sc = (struct cm_softc *)vsc; 634 int buffer, len, offset, s, type; 635 int cm_ram_ptr; 636 struct mbuf *m; 637 struct arc_header *ah; 638 struct ifnet *ifp; 639 640 ifp = &sc->sc_arccom.ac_if; 641 642 s = splimp(); 643 buffer = sc->sc_rx_act ^ 1; 644 splx(s); 645 646 /* Allocate header mbuf */ 647 MGETHDR(m, M_DONTWAIT, MT_DATA); 648 649 if (m == 0) { 650 /* 651 * in case s.th. goes wrong with mem, drop it 652 * to make sure the receiver can be started again 653 * count it as input error (we dont have any other 654 * detectable) 655 */ 656 ifp->if_ierrors++; 657 goto cleanup; 658 } 659 660 m->m_pkthdr.rcvif = ifp; 661 662 /* 663 * Align so that IP packet will be longword aligned. Here we 664 * assume that m_data of new packet is longword aligned. 665 * When implementing PHDS, we might have to change it to 2, 666 * (2*sizeof(ulong) - CM_HDRNEWLEN)), packet type dependent. 667 */ 668 669 cm_ram_ptr = buffer*512; 670 offset = GETMEM(cm_ram_ptr + 2); 671 if (offset) 672 len = 256 - offset; 673 else { 674 offset = GETMEM(cm_ram_ptr + 3); 675 len = 512 - offset; 676 } 677 678 /* 679 * first +2 bytes for align fixup below 680 * second +2 bytes are for src/dst addresses 681 */ 682 if ((len + 2 + 2) > MHLEN) { 683 /* attach an mbuf cluster */ 684 MCLGET(m, M_DONTWAIT); 685 686 /* Insist on getting a cluster */ 687 if ((m->m_flags & M_EXT) == 0) { 688 ifp->if_ierrors++; 689 goto cleanup; 690 } 691 } 692 693 if (m == 0) { 694 ifp->if_ierrors++; 695 goto cleanup; 696 } 697 698 type = GETMEM(cm_ram_ptr + offset); 699 m->m_data += 1 + arc_isphds(type); 700 /* mbuf filled with ARCnet addresses */ 701 m->m_pkthdr.len = m->m_len = len + 2; 702 703 ah = mtod(m, struct arc_header *); 704 ah->arc_shost = GETMEM(cm_ram_ptr + 0); 705 ah->arc_dhost = GETMEM(cm_ram_ptr + 1); 706 707 bus_space_read_region_1( 708 rman_get_bustag(sc->mem_res), rman_get_bushandle(sc->mem_res), 709 cm_ram_ptr + offset, mtod(m, u_char *) + 2, len); 710 711 arc_input(ifp, m); 712 713 m = NULL; 714 ifp->if_ipackets++; 715 716cleanup: 717 718 if (m != NULL) 719 m_freem(m); 720 721 /* mark buffer as invalid by source id 0 */ 722 PUTMEM(buffer << 9, 0); 723 s = splimp(); 724 725 if (--sc->sc_rx_fillcount == 2 - 1) { 726 727 /* was off, restart it on buffer just emptied */ 728 sc->sc_rx_act = buffer; 729 sc->sc_intmask |= CM_RI; 730 731 /* this also clears the RI flag interupt: */ 732 PUTREG(CMCMD, CM_RXBC(buffer)); 733 PUTREG(CMSTAT, sc->sc_intmask); 734 735#ifdef CM_DEBUG 736 if_printf(ifp, "srint: restarted rx on buf %d\n", buffer); 737#endif 738 } 739 splx(s); 740} 741 742__inline static void 743cm_tint(sc, isr) 744 struct cm_softc *sc; 745 int isr; 746{ 747 struct ifnet *ifp; 748 749 int buffer; 750#ifdef CMTIMINGS 751 int clknow; 752#endif 753 754 ifp = &(sc->sc_arccom.ac_if); 755 buffer = sc->sc_tx_act; 756 757 /* 758 * retransmit code: 759 * Normal situtations first for fast path: 760 * If acknowledgement received ok or broadcast, we're ok. 761 * else if 762 */ 763 764 if (isr & CM_TMA || sc->sc_broadcast[buffer]) 765 sc->sc_arccom.ac_if.if_opackets++; 766#ifdef CMRETRANSMIT 767 else if (ifp->if_flags & IFF_LINK2 && ifp->if_timer > 0 768 && --sc->sc_retransmits[buffer] > 0) { 769 /* retransmit same buffer */ 770 PUTREG(CMCMD, CM_TX(buffer)); 771 return; 772 } 773#endif 774 else 775 ifp->if_oerrors++; 776 777 778 /* We know we can accept another buffer at this point. */ 779 ifp->if_flags &= ~IFF_OACTIVE; 780 781 if (--sc->sc_tx_fillcount > 0) { 782 783 /* 784 * start tx on other buffer. 785 * This also clears the int flag 786 */ 787 buffer ^= 1; 788 sc->sc_tx_act = buffer; 789 790 /* 791 * already given: 792 * sc->sc_intmask |= CM_TA; 793 * PUTREG(CMSTAT, sc->sc_intmask); 794 */ 795 PUTREG(CMCMD, CM_TX(buffer)); 796 /* init watchdog timer */ 797 ifp->if_timer = ARCTIMEOUT; 798 799#if defined(CM_DEBUG) && (CM_DEBUG > 1) 800 if_printf(ifp, 801 "tint: starting tx on buffer %d, status 0x%02x\n", 802 buffer, GETREG(CMSTAT)); 803#endif 804 } else { 805 /* have to disable TX interrupt */ 806 sc->sc_intmask &= ~CM_TA; 807 PUTREG(CMSTAT, sc->sc_intmask); 808 /* ... and watchdog timer */ 809 ifp->if_timer = 0; 810 811#ifdef CM_DEBUG 812 if_printf(ifp, "tint: no more buffers to send, status 0x%02x\n", 813 GETREG(CMSTAT)); 814#endif 815 } 816 817 /* XXXX TODO */ 818#ifdef CMSOFTCOPY 819 /* schedule soft int to fill a new buffer for us */ 820 softintr_schedule(sc->sc_txcookie); 821#else 822 /* call it directly */ 823 cm_start(ifp); 824#endif 825} 826 827/* 828 * Our interrupt routine 829 */ 830void 831cmintr(arg) 832 void *arg; 833{ 834 struct cm_softc *sc = arg; 835 struct ifnet *ifp = &sc->sc_arccom.ac_if; 836 837 u_char isr, maskedisr; 838 int buffer; 839 u_long newsec; 840 841 isr = GETREG(CMSTAT); 842 maskedisr = isr & sc->sc_intmask; 843 if (!maskedisr) 844 return; 845 do { 846 847#if defined(CM_DEBUG) && (CM_DEBUG>1) 848 if_printf(ifp, "intr: status 0x%02x, intmask 0x%02x\n", 849 isr, sc->sc_intmask); 850#endif 851 852 if (maskedisr & CM_POR) { 853 /* 854 * XXX We should never see this. Don't bother to store 855 * the address. 856 * sc->sc_arccom.ac_anaddr = GETMEM(CMMACOFF); 857 */ 858 PUTREG(CMCMD, CM_CLR(CLR_POR)); 859 log(LOG_WARNING, 860 "%s%d: intr: got spurious power on reset int\n", 861 ifp->if_name, ifp->if_unit); 862 } 863 864 if (maskedisr & CM_RECON) { 865 /* 866 * we dont need to: 867 * PUTREG(CMCMD, CM_CONF(CONF_LONG)); 868 */ 869 PUTREG(CMCMD, CM_CLR(CLR_RECONFIG)); 870 sc->sc_arccom.ac_if.if_collisions++; 871 872 /* 873 * If less than 2 seconds per reconfig: 874 * If ARC_EXCESSIVE_RECONFIGS 875 * since last burst, complain and set treshold for 876 * warnings to ARC_EXCESSIVE_RECONS_REWARN. 877 * 878 * This allows for, e.g., new stations on the cable, or 879 * cable switching as long as it is over after 880 * (normally) 16 seconds. 881 * 882 * XXX TODO: check timeout bits in status word and 883 * double time if necessary. 884 */ 885 886 callout_stop(&sc->sc_recon_ch); 887 newsec = time_second; 888 if ((newsec - sc->sc_recontime <= 2) && 889 (++sc->sc_reconcount == ARC_EXCESSIVE_RECONS)) { 890 log(LOG_WARNING, 891 "%s%d: excessive token losses, " 892 "cable problem?\n", 893 ifp->if_name, ifp->if_unit); 894 } 895 sc->sc_recontime = newsec; 896 callout_reset(&sc->sc_recon_ch, 15 * hz, 897 cm_reconwatch, (void *)sc); 898 } 899 900 if (maskedisr & CM_RI) { 901#if defined(CM_DEBUG) && (CM_DEBUG > 1) 902 if_printf(ifp, "intr: hard rint, act %d\n", 903 sc->sc_rx_act); 904#endif 905 906 buffer = sc->sc_rx_act; 907 /* look if buffer is marked invalid: */ 908 if (GETMEM(buffer*512) == 0) { 909 /* 910 * invalid marked buffer (or illegally 911 * configured sender) 912 */ 913 log(LOG_WARNING, 914 "%s%d: spurious RX interupt or sender 0 " 915 " (ignored)\n", ifp->if_name, ifp->if_unit); 916 /* 917 * restart receiver on same buffer. 918 * XXX maybe better reset interface? 919 */ 920 PUTREG(CMCMD, CM_RXBC(buffer)); 921 } else { 922 if (++sc->sc_rx_fillcount > 1) { 923 sc->sc_intmask &= ~CM_RI; 924 PUTREG(CMSTAT, sc->sc_intmask); 925 } else { 926 buffer ^= 1; 927 sc->sc_rx_act = buffer; 928 929 /* 930 * Start receiver on other receive 931 * buffer. This also clears the RI 932 * interupt flag. 933 */ 934 PUTREG(CMCMD, CM_RXBC(buffer)); 935 /* in RX intr, so mask is ok for RX */ 936 937#ifdef CM_DEBUG 938 if_printf(ifp, "strt rx for buf %d, " 939 "stat 0x%02x\n", 940 sc->sc_rx_act, GETREG(CMSTAT)); 941#endif 942 } 943 944#ifdef CMSOFTCOPY 945 /* 946 * this one starts a soft int to copy out 947 * of the hw 948 */ 949 softintr_schedule(sc->sc_rxcookie); 950#else 951 /* this one does the copy here */ 952 cm_srint(sc); 953#endif 954 } 955 } 956 if (maskedisr & CM_TA) { 957 cm_tint(sc, isr); 958 } 959 isr = GETREG(CMSTAT); 960 maskedisr = isr & sc->sc_intmask; 961 } while (maskedisr); 962#if defined(CM_DEBUG) && (CM_DEBUG>1) 963 if_printf(ifp, "intr (exit): status 0x%02x, intmask 0x%02x\n", 964 isr, sc->sc_intmask); 965#endif 966} 967 968void 969cm_reconwatch(arg) 970 void *arg; 971{ 972 struct cm_softc *sc = arg; 973 struct ifnet *ifp = &sc->sc_arccom.ac_if; 974 975 if (sc->sc_reconcount >= ARC_EXCESSIVE_RECONS) { 976 sc->sc_reconcount = 0; 977 log(LOG_WARNING, "%s%d: token valid again.\n", 978 ifp->if_name, ifp->if_unit); 979 } 980 sc->sc_reconcount = 0; 981} 982 983 984/* 985 * Process an ioctl request. 986 * This code needs some work - it looks pretty ugly. 987 */ 988int 989cm_ioctl(ifp, command, data) 990 struct ifnet *ifp; 991 u_long command; 992 caddr_t data; 993{ 994 struct cm_softc *sc; 995 struct ifaddr *ifa; 996 struct ifreq *ifr; 997 int s, error; 998 999 error = 0; 1000 sc = ifp->if_softc; 1001 ifa = (struct ifaddr *)data; 1002 ifr = (struct ifreq *)data; 1003 s = splimp(); 1004 1005#if defined(CM_DEBUG) && (CM_DEBUG > 2) 1006 if_printf(ifp, "ioctl() called, cmd = 0x%lx\n", command); 1007#endif 1008 1009 switch (command) { 1010 case SIOCSIFADDR: 1011 case SIOCADDMULTI: 1012 case SIOCDELMULTI: 1013 case SIOCSIFMTU: 1014 error = arc_ioctl(ifp, command, data); 1015 break; 1016 1017 case SIOCSIFFLAGS: 1018 if ((ifp->if_flags & IFF_UP) == 0 && 1019 (ifp->if_flags & IFF_RUNNING) != 0) { 1020 /* 1021 * If interface is marked down and it is running, 1022 * then stop it. 1023 */ 1024 cm_stop(sc); 1025 ifp->if_flags &= ~IFF_RUNNING; 1026 } else if ((ifp->if_flags & IFF_UP) != 0 && 1027 (ifp->if_flags & IFF_RUNNING) == 0) { 1028 /* 1029 * If interface is marked up and it is stopped, then 1030 * start it. 1031 */ 1032 cm_init(sc); 1033 } 1034 break; 1035 1036 default: 1037 error = EINVAL; 1038 break; 1039 } 1040 1041 splx(s); 1042 return (error); 1043} 1044 1045/* 1046 * watchdog routine for transmitter. 1047 * 1048 * We need this, because else a receiver whose hardware is alive, but whose 1049 * software has not enabled the Receiver, would make our hardware wait forever 1050 * Discovered this after 20 times reading the docs. 1051 * 1052 * Only thing we do is disable transmitter. We'll get a transmit timeout, 1053 * and the int handler will have to decide not to retransmit (in case 1054 * retransmission is implemented). 1055 * 1056 * This one assumes being called inside splimp() 1057 */ 1058 1059void 1060cm_watchdog(ifp) 1061 struct ifnet *ifp; 1062{ 1063 struct cm_softc *sc = ifp->if_softc; 1064 1065 PUTREG(CMCMD, CM_TXDIS); 1066 return; 1067} 1068