if_ep.c revision 51630
1/* 2 * Copyright (c) 1994 Herb Peyerl <hpeyerl@novatel.ca> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Herb Peyerl. 16 * 4. The name of Herb Peyerl may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * if_ep.c,v 1.19 1995/01/24 20:53:45 davidg Exp 31 */ 32 33/* 34 * Modified from the FreeBSD 1.1.5.1 version by: 35 * Andres Vega Garcia 36 * INRIA - Sophia Antipolis, France 37 * avega@sophia.inria.fr 38 */ 39 40/* 41 * $FreeBSD: head/sys/dev/ep/if_ep.c 51630 1999-09-24 16:27:32Z obrien $ 42 * 43 * Promiscuous mode added and interrupt logic slightly changed 44 * to reduce the number of adapter failures. Transceiver select 45 * logic changed to use value from EEPROM. Autoconfiguration 46 * features added. 47 * Done by: 48 * Serge Babkin 49 * Chelindbank (Chelyabinsk, Russia) 50 * babkin@hq.icb.chel.su 51 */ 52 53/* 54 * Pccard support for 3C589 by: 55 * HAMADA Naoki 56 * nao@tom-yam.or.jp 57 */ 58 59#include "ep.h" 60#if NEP > 0 61 62#include "bpf.h" 63#include "opt_inet.h" 64#include "opt_ipx.h" 65 66#include <sys/param.h> 67#if defined(__FreeBSD__) 68#include <sys/kernel.h> 69#include <sys/systm.h> 70#endif 71#include <sys/malloc.h> 72#include <sys/mbuf.h> 73#include <sys/socket.h> 74#include <sys/sockio.h> 75#if defined(__NetBSD__) 76#include <sys/select.h> 77#endif 78 79#include <net/ethernet.h> 80#include <net/if.h> 81 82#include <netinet/in.h> 83#include <netinet/if_ether.h> 84 85#if NBPF > 0 86#include <net/bpf.h> 87#endif 88 89#if defined(__FreeBSD__) 90#include <machine/clock.h> 91#endif 92 93#include <i386/isa/isa_device.h> 94#include <i386/isa/if_epreg.h> 95#include <i386/isa/elink.h> 96 97/* DELAY_MULTIPLE: How much to boost "base" delays, except 98 * for the inter-bit delays in get_eeprom_data. A cyrix Media GX needed this. 99 */ 100#define DELAY_MULTIPLE 10 101#define BIT_DELAY_MULTIPLE 10 102 103/* Exported variables */ 104u_long ep_unit; 105int ep_boards; 106struct ep_board ep_board[EP_MAX_BOARDS + 1]; 107 108static int eeprom_rdy __P((struct ep_softc *sc)); 109 110static int ep_isa_probe __P((struct isa_device *)); 111static struct ep_board * ep_look_for_board_at __P((struct isa_device *is)); 112static int ep_isa_attach __P((struct isa_device *)); 113static int epioctl __P((struct ifnet * ifp, u_long, caddr_t)); 114 115static void epinit __P((void *)); 116static ointhand2_t epintr; 117static void epread __P((struct ep_softc *)); 118void epreset __P((int)); 119static void epstart __P((struct ifnet *)); 120static void epstop __P((struct ep_softc *)); 121static void epwatchdog __P((struct ifnet *)); 122 123#if 0 124static int send_ID_sequence __P((int)); 125#endif 126static int get_eeprom_data __P((int, int)); 127 128static struct ep_softc* ep_softc[NEP]; 129static int ep_current_tag = EP_LAST_TAG + 1; 130static char *ep_conn_type[] = {"UTP", "AUI", "???", "BNC"}; 131 132#define ep_ftst(f) (sc->stat&(f)) 133#define ep_fset(f) (sc->stat|=(f)) 134#define ep_frst(f) (sc->stat&=~(f)) 135 136struct isa_driver epdriver = { 137 ep_isa_probe, 138 ep_isa_attach, 139 "ep", 140 0 141}; 142 143#include "card.h" 144 145#if NCARD > 0 146#include <sys/select.h> 147#include <sys/module.h> 148#include <pccard/cardinfo.h> 149#include <pccard/slot.h> 150 151/* 152 * PC-Card (PCMCIA) specific code. 153 */ 154static int ep_pccard_init __P((struct pccard_devinfo *)); 155static int ep_pccard_attach __P((struct pccard_devinfo *)); 156static void ep_unload __P((struct pccard_devinfo *)); 157static int card_intr __P((struct pccard_devinfo *)); 158static int ep_pccard_identify (struct ep_board *epb, int unit); 159 160PCCARD_MODULE(ep, ep_pccard_init, ep_unload, card_intr, 0, net_imask); 161 162/* 163 * Initialize the device - called from Slot manager. 164 */ 165static int 166ep_pccard_init(devi) 167 struct pccard_devinfo *devi; 168{ 169 struct isa_device *is = &devi->isahd; 170 struct ep_softc *sc = ep_softc[is->id_unit]; 171 struct ep_board *epb; 172 int i; 173 174 epb = &ep_board[is->id_unit]; 175 176 if (sc == 0) { 177 if ((sc = ep_alloc(is->id_unit, epb)) == 0) { 178 return (ENXIO); 179 } 180 ep_unit++; 181 } 182 183 /* get_e() requires these. */ 184 sc->ep_io_addr = is->id_iobase; 185 sc->unit = is->id_unit; 186 epb->epb_addr = is->id_iobase; 187 epb->epb_used = 1; 188 189 /* 190 * XXX - Certain (newer?) 3Com cards need epb->cmd_off == 2. Sadly, 191 * you need to have a correct cmd_off in order to identify the card. 192 * So we have to hit it with both and cross our virtual fingers. There's 193 * got to be a better way to do this. jyoung@accessus.net 09/11/1999 194 */ 195 196 epb->cmd_off = 0; 197 epb->prod_id = get_e(sc, EEPROM_PROD_ID); 198 if (!ep_pccard_identify(epb, is->id_unit)) { 199 if (bootverbose) printf("ep%d: Pass 1 of 2 detection failed (nonfatal)\n", is->id_unit); 200 epb->cmd_off = 2; 201 epb->prod_id = get_e(sc, EEPROM_PROD_ID); 202 if (!ep_pccard_identify(epb, is->id_unit)) { 203 if (bootverbose) printf("ep%d: Pass 2 of 2 detection failed (fatal!)\n", is->id_unit); 204 printf("ep%d: Unit failed to come ready or product ID unknown! (id 0x%x)\n", is->id_unit, epb->prod_id); 205 return (ENXIO); 206 } 207 } 208 209 epb->res_cfg = get_e(sc, EEPROM_RESOURCE_CFG); 210 for (i = 0; i < 3; i++) 211 sc->epb->eth_addr[i] = get_e(sc, EEPROM_NODE_ADDR_0 + i); 212 213 if (ep_pccard_attach(devi) == 0) 214 return (ENXIO); 215 216 sc->arpcom.ac_if.if_snd.ifq_maxlen = ifqmaxlen; 217 return (0); 218} 219 220static int 221ep_pccard_identify(epb, unit) 222 struct ep_board *epb; 223 int unit; 224{ 225 /* Determine device type and associated MII capabilities */ 226 switch (epb->prod_id) { 227 case 0x6055: /* 3C556 */ 228 if (bootverbose) printf("ep%d: 3Com 3C556\n", unit); 229 epb->mii_trans = 1; 230 return (1); 231 break; /* NOTREACHED */ 232 case 0x4057: /* 3C574 */ 233 if (bootverbose) printf("ep%d: 3Com 3C574\n", unit); 234 epb->mii_trans = 1; 235 return (1); 236 break; /* NOTREACHED */ 237 case 0x4b57: /* 3C574B */ 238 if (bootverbose) printf("ep%d: 3Com 3C574B, Megahertz 3CCFE574BT or Fast Etherlink 3C574-TX\n", unit); 239 epb->mii_trans = 1; 240 return (1); 241 break; /* NOTREACHED */ 242 case 0x9058: /* 3C589 */ 243 if (bootverbose) printf("ep%d: 3Com Etherlink III 3C589[B/C/D]\n", unit); 244 epb->mii_trans = 0; 245 return (1); 246 break; /* NOTREACHED */ 247 } 248 return (0); 249} 250 251static int 252ep_pccard_attach(devi) 253 struct pccard_devinfo *devi; 254{ 255 struct isa_device *is = &devi->isahd; 256 struct ep_softc *sc = ep_softc[is->id_unit]; 257 u_short config; 258 259 sc->ep_connectors = 0; 260 config = inw(IS_BASE + EP_W0_CONFIG_CTRL); 261 if (config & IS_BNC) { 262 sc->ep_connectors |= BNC; 263 } 264 if (config & IS_UTP) { 265 sc->ep_connectors |= UTP; 266 } 267 if (!(sc->ep_connectors & 7)) 268 /* (Apparently) non-fatal */ 269 if(bootverbose) printf("ep%d: No connectors or MII.\n", is->id_unit); 270 271 sc->ep_connector = inw(BASE + EP_W0_ADDRESS_CFG) >> ACF_CONNECTOR_BITS; 272 273 /* ROM size = 0, ROM base = 0 */ 274 /* For now, ignore AUTO SELECT feature of 3C589B and later. */ 275 outw(BASE + EP_W0_ADDRESS_CFG, get_e(sc, EEPROM_ADDR_CFG) & 0xc000); 276 277 /* Fake IRQ must be 3 */ 278 outw(BASE + EP_W0_RESOURCE_CFG, (sc->epb->res_cfg & 0x0fff) | 0x3000); 279 280 outw(BASE + EP_W0_PRODUCT_ID, sc->epb->prod_id); 281 282 if (sc->epb->mii_trans) { 283 /* 284 * turn on the MII transciever 285 */ 286 GO_WINDOW(3); 287 outw(BASE + EP_W3_OPTIONS, 0x8040); 288 DELAY(1000); 289 outw(BASE + EP_W3_OPTIONS, 0xc040); 290 outw(BASE + EP_COMMAND, RX_RESET); 291 outw(BASE + EP_COMMAND, TX_RESET); 292 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 293 DELAY(1000); 294 outw(BASE + EP_W3_OPTIONS, 0x8040); 295 } 296 297 ep_attach(sc); 298 299 return 1; 300} 301 302static void 303ep_unload(devi) 304 struct pccard_devinfo *devi; 305{ 306 struct ep_softc *sc = ep_softc[devi->isahd.id_unit]; 307 308 if (sc->gone) { 309 printf("ep%d: already unloaded\n", devi->isahd.id_unit); 310 return; 311 } 312 sc->arpcom.ac_if.if_flags &= ~IFF_RUNNING; 313 sc->gone = 1; 314 printf("ep%d: unload\n", devi->isahd.id_unit); 315} 316 317/* 318 * card_intr - Shared interrupt called from 319 * front end of PC-Card handler. 320 */ 321static int 322card_intr(devi) 323 struct pccard_devinfo *devi; 324{ 325 epintr(devi->isahd.id_unit); 326 return(1); 327} 328#endif /* NCARD > 0 */ 329 330static int 331eeprom_rdy(sc) 332 struct ep_softc *sc; 333{ 334 int i; 335 336 for (i = 0; is_eeprom_busy(BASE) && i < MAX_EEPROMBUSY; i++) 337 continue; 338 if (i >= MAX_EEPROMBUSY) { 339 printf("ep%d: eeprom failed to come ready.\n", sc->unit); 340 return (0); 341 } 342 return (1); 343} 344 345static struct ep_board * 346ep_look_for_board_at(is) 347 struct isa_device *is; 348{ 349 int data, i, j, id_port = ELINK_ID_PORT; 350 int count = 0; 351 352 if (ep_current_tag == (EP_LAST_TAG + 1)) { 353 /* Come here just one time */ 354 355 ep_current_tag--; 356 357 /* Look for the ISA boards. Init and leave them actived */ 358 outb(id_port, 0); 359 outb(id_port, 0); 360 361 elink_idseq(0xCF); 362 363 elink_reset(); 364 DELAY(DELAY_MULTIPLE * 10000); 365 for (i = 0; i < EP_MAX_BOARDS; i++) { 366 outb(id_port, 0); 367 outb(id_port, 0); 368 elink_idseq(0xCF); 369 370 data = get_eeprom_data(id_port, EEPROM_MFG_ID); 371 if (data != MFG_ID) 372 break; 373 374 /* resolve contention using the Ethernet address */ 375 376 for (j = 0; j < 3; j++) 377 get_eeprom_data(id_port, j); 378 379 /* and save this address for later use */ 380 381 for (j = 0; j < 3; j++) 382 ep_board[ep_boards].eth_addr[j] = get_eeprom_data(id_port, j); 383 384 ep_board[ep_boards].res_cfg = 385 get_eeprom_data(id_port, EEPROM_RESOURCE_CFG); 386 387 ep_board[ep_boards].prod_id = 388 get_eeprom_data(id_port, EEPROM_PROD_ID); 389 390 ep_board[ep_boards].epb_used = 0; 391#ifdef PC98 392 ep_board[ep_boards].epb_addr = 393 (get_eeprom_data(id_port, EEPROM_ADDR_CFG) & 0x1f) * 0x100 + 0x40d0; 394#else 395 ep_board[ep_boards].epb_addr = 396 (get_eeprom_data(id_port, EEPROM_ADDR_CFG) & 0x1f) * 0x10 + 0x200; 397 398 if (ep_board[ep_boards].epb_addr > 0x3E0) 399 /* Board in EISA configuration mode */ 400 continue; 401#endif /* PC98 */ 402 403 outb(id_port, ep_current_tag); /* tags board */ 404 outb(id_port, ACTIVATE_ADAPTER_TO_CONFIG); 405 ep_boards++; 406 count++; 407 ep_current_tag--; 408 } 409 410 ep_board[ep_boards].epb_addr = 0; 411 if (count) { 412 printf("%d 3C5x9 board(s) on ISA found at", count); 413 for (j = 0; ep_board[j].epb_addr; j++) 414 if (ep_board[j].epb_addr <= 0x3E0) 415 printf(" 0x%x", ep_board[j].epb_addr); 416 printf("\n"); 417 } 418 } 419 420 /* we have two cases: 421 * 422 * 1. Device was configured with 'port ?' 423 * In this case we search for the first unused card in list 424 * 425 * 2. Device was configured with 'port xxx' 426 * In this case we search for the unused card with that address 427 * 428 */ 429 430 if (IS_BASE == -1) { /* port? */ 431 for (i = 0; ep_board[i].epb_addr && ep_board[i].epb_used; i++) 432 ; 433 if (ep_board[i].epb_addr == 0) 434 return 0; 435 436 IS_BASE = ep_board[i].epb_addr; 437 ep_board[i].epb_used = 1; 438 439 return &ep_board[i]; 440 } else { 441 for (i = 0; 442 ep_board[i].epb_addr && ep_board[i].epb_addr != IS_BASE; 443 i++) 444 ; 445 446 if (ep_board[i].epb_used || ep_board[i].epb_addr != IS_BASE) 447 return 0; 448 449 if (inw(IS_BASE + EP_W0_EEPROM_COMMAND) & EEPROM_TST_MODE) { 450 printf("ep%d: 3c5x9 at 0x%x in PnP mode. Disable PnP mode!\n", 451 is->id_unit, IS_BASE); 452 } 453 ep_board[i].epb_used = 1; 454 455 return &ep_board[i]; 456 } 457} 458 459/* 460 * get_e: gets a 16 bits word from the EEPROM. we must have set the window 461 * before 462 */ 463u_int16_t 464get_e(sc, offset) 465 struct ep_softc *sc; 466 int offset; 467{ 468 if (!eeprom_rdy(sc)) 469 return (0xffff); 470 outw(BASE + EP_W0_EEPROM_COMMAND, (EEPROM_CMD_RD << sc->epb->cmd_off) | offset); 471 if (!eeprom_rdy(sc)) 472 return (0xffff); 473 return (inw(BASE + EP_W0_EEPROM_DATA)); 474} 475 476struct ep_softc * 477ep_alloc(unit, epb) 478 int unit; 479 struct ep_board *epb; 480{ 481 struct ep_softc *sc; 482 483 if (unit >= NEP) { 484 printf("ep: unit number (%d) too high\n", unit); 485 return NULL; 486 } 487 488 /* 489 * Allocate a storage area for us 490 */ 491 if (ep_softc[unit]) { 492 printf("ep%d: unit number already allocated to another " 493 "adaptor\n", unit); 494 return NULL; 495 } 496 497 sc = malloc(sizeof(struct ep_softc), M_DEVBUF, M_NOWAIT); 498 if (!sc) { 499 printf("ep%d: cannot malloc!\n", unit); 500 return NULL; 501 } 502 bzero(sc, sizeof(struct ep_softc)); 503 ep_softc[unit] = sc; 504 sc->unit = unit; 505 sc->ep_io_addr = epb->epb_addr; 506 sc->epb = epb; 507 508 return(sc); 509} 510 511void 512ep_free(sc) 513 struct ep_softc *sc; 514{ 515 ep_softc[sc->unit] = NULL; 516 free(sc, M_DEVBUF); 517 return; 518} 519 520int 521ep_isa_probe(is) 522 struct isa_device *is; 523{ 524 struct ep_softc *sc; 525 struct ep_board *epb; 526 u_short k; 527 528 if ((epb = ep_look_for_board_at(is)) == 0) 529 return (0); 530 531 /* 532 * Allocate a storage area for us 533 */ 534 sc = ep_alloc(ep_unit, epb); 535 if (!sc) 536 return (0); 537 538 is->id_unit = ep_unit++; 539 540 /* 541 * The iobase was found and MFG_ID was 0x6d50. PROD_ID should be 542 * 0x9[0-f]50 (IBM-PC) 543 * 0x9[0-f]5[0-f] (PC-98) 544 */ 545 GO_WINDOW(0); 546 k = sc->epb->prod_id; 547#ifdef PC98 548 if ((k & 0xf0f0) != (PROD_ID & 0xf0f0)) { 549#else 550 if ((k & 0xf0ff) != (PROD_ID & 0xf0ff)) { 551#endif 552 printf("ep_isa_probe: ignoring model %04x\n", k); 553 ep_free(sc); 554 return (0); 555 } 556 557 k = sc->epb->res_cfg; 558 559 k >>= 12; 560 561 /* Now we have two cases again: 562 * 563 * 1. Device was configured with 'irq?' 564 * In this case we use irq read from the board 565 * 566 * 2. Device was configured with 'irq xxx' 567 * In this case we set up the board to use specified interrupt 568 * 569 */ 570 571 if (is->id_irq == 0) { /* irq? */ 572 is->id_irq = 1 << ((k == 2) ? 9 : k); 573 } 574 575 sc->stat = 0; /* 16 bit access */ 576 577 /* By now, the adapter is already activated */ 578 579 return (EP_IOSIZE); /* 16 bytes of I/O space used. */ 580} 581 582static int 583ep_isa_attach(is) 584 struct isa_device *is; 585{ 586 struct ep_softc *sc = ep_softc[is->id_unit]; 587 u_short config; 588 int irq; 589 590 is->id_ointr = epintr; 591 sc->ep_connectors = 0; 592 config = inw(IS_BASE + EP_W0_CONFIG_CTRL); 593 if (config & IS_AUI) { 594 sc->ep_connectors |= AUI; 595 } 596 if (config & IS_BNC) { 597 sc->ep_connectors |= BNC; 598 } 599 if (config & IS_UTP) { 600 sc->ep_connectors |= UTP; 601 } 602 if (!(sc->ep_connectors & 7)) 603 printf("no connectors!"); 604 sc->ep_connector = inw(BASE + EP_W0_ADDRESS_CFG) >> ACF_CONNECTOR_BITS; 605 /* 606 * Write IRQ value to board 607 */ 608 609 irq = ffs(is->id_irq) - 1; 610 if (irq == -1) { 611 printf(" invalid irq... cannot attach\n"); 612 return 0; 613 } 614 615 GO_WINDOW(0); 616 SET_IRQ(BASE, irq); 617 618 ep_attach(sc); 619 return 1; 620} 621 622int 623ep_attach(sc) 624 struct ep_softc *sc; 625{ 626 struct ifnet *ifp = &sc->arpcom.ac_if; 627 u_short *p; 628 int i; 629 int attached; 630 631 sc->gone = 0; 632 attached = (ifp->if_softc != 0); 633 634 printf("ep%d: ", sc->unit); 635 /* 636 * Current media type 637 */ 638 if (sc->ep_connectors & AUI) { 639 printf("aui"); 640 if (sc->ep_connectors & ~AUI) 641 printf("/"); 642 } 643 if (sc->ep_connectors & UTP) { 644 printf("utp"); 645 if (sc->ep_connectors & BNC) 646 printf("/"); 647 } 648 if (sc->ep_connectors & BNC) { 649 printf("bnc"); 650 } 651 652 printf("[*%s*]", ep_conn_type[sc->ep_connector]); 653 654 /* 655 * Setup the station address 656 */ 657 p = (u_short *) & sc->arpcom.ac_enaddr; 658 GO_WINDOW(2); 659 for (i = 0; i < 3; i++) { 660 p[i] = htons(sc->epb->eth_addr[i]); 661 outw(BASE + EP_W2_ADDR_0 + (i * 2), ntohs(p[i])); 662 } 663 printf(" address %6D\n", sc->arpcom.ac_enaddr, ":"); 664 665 ifp->if_softc = sc; 666 ifp->if_unit = sc->unit; 667 ifp->if_name = "ep"; 668 ifp->if_mtu = ETHERMTU; 669 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 670 ifp->if_output = ether_output; 671 ifp->if_start = epstart; 672 ifp->if_ioctl = epioctl; 673 ifp->if_watchdog = epwatchdog; 674 ifp->if_init = epinit; 675 676 if (!attached) { 677 if_attach(ifp); 678 ether_ifattach(ifp); 679 } 680 681#ifdef EP_LOCAL_STATS 682 sc->rx_no_first = sc->rx_no_mbuf = 683 sc->rx_bpf_disc = sc->rx_overrunf = sc->rx_overrunl = 684 sc->tx_underrun = 0; 685#endif 686 ep_fset(F_RX_FIRST); 687 sc->top = sc->mcur = 0; 688 689#if NBPF > 0 690 if (!attached) { 691 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 692 } 693#endif 694 return 0; 695} 696 697 698/* 699 * The order in here seems important. Otherwise we may not receive 700 * interrupts. ?! 701 */ 702static void 703epinit(xsc) 704 void *xsc; 705{ 706 struct ep_softc *sc = xsc; 707 register struct ifnet *ifp = &sc->arpcom.ac_if; 708 int s, i, j; 709 710 if (sc->gone) 711 return; 712 713 /* 714 if (ifp->if_addrlist == (struct ifaddr *) 0) 715 return; 716 */ 717 718 s = splimp(); 719 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 720 721 GO_WINDOW(0); 722 outw(BASE + EP_COMMAND, STOP_TRANSCEIVER); 723 GO_WINDOW(4); 724 outw(BASE + EP_W4_MEDIA_TYPE, DISABLE_UTP); 725 GO_WINDOW(0); 726 727 /* Disable the card */ 728 outw(BASE + EP_W0_CONFIG_CTRL, 0); 729 730 /* Enable the card */ 731 outw(BASE + EP_W0_CONFIG_CTRL, ENABLE_DRQ_IRQ); 732 733 GO_WINDOW(2); 734 735 /* Reload the ether_addr. */ 736 for (i = 0; i < 6; i++) 737 outb(BASE + EP_W2_ADDR_0 + i, sc->arpcom.ac_enaddr[i]); 738 739 outw(BASE + EP_COMMAND, RX_RESET); 740 outw(BASE + EP_COMMAND, TX_RESET); 741 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 742 743 /* Window 1 is operating window */ 744 GO_WINDOW(1); 745 for (i = 0; i < 31; i++) 746 inb(BASE + EP_W1_TX_STATUS); 747 748 /* get rid of stray intr's */ 749 outw(BASE + EP_COMMAND, ACK_INTR | 0xff); 750 751 outw(BASE + EP_COMMAND, SET_RD_0_MASK | S_5_INTS); 752 753 outw(BASE + EP_COMMAND, SET_INTR_MASK | S_5_INTS); 754 755 if (ifp->if_flags & IFF_PROMISC) 756 outw(BASE + EP_COMMAND, SET_RX_FILTER | FIL_INDIVIDUAL | 757 FIL_GROUP | FIL_BRDCST | FIL_ALL); 758 else 759 outw(BASE + EP_COMMAND, SET_RX_FILTER | FIL_INDIVIDUAL | 760 FIL_GROUP | FIL_BRDCST); 761 762 /* 763 * S.B. 764 * 765 * Now behavior was slightly changed: 766 * 767 * if any of flags link[0-2] is used and its connector is 768 * physically present the following connectors are used: 769 * 770 * link0 - AUI * highest precedence 771 * link1 - BNC 772 * link2 - UTP * lowest precedence 773 * 774 * If none of them is specified then 775 * connector specified in the EEPROM is used 776 * (if present on card or AUI if not). 777 * 778 */ 779 780 /* Set the xcvr. */ 781 if (ifp->if_flags & IFF_LINK0 && sc->ep_connectors & AUI) { 782 i = ACF_CONNECTOR_AUI; 783 } else if (ifp->if_flags & IFF_LINK1 && sc->ep_connectors & BNC) { 784 i = ACF_CONNECTOR_BNC; 785 } else if (ifp->if_flags & IFF_LINK2 && sc->ep_connectors & UTP) { 786 i = ACF_CONNECTOR_UTP; 787 } else { 788 i = sc->ep_connector; 789 } 790 GO_WINDOW(0); 791 j = inw(BASE + EP_W0_ADDRESS_CFG) & 0x3fff; 792 outw(BASE + EP_W0_ADDRESS_CFG, j | (i << ACF_CONNECTOR_BITS)); 793 794 switch(i) { 795 case ACF_CONNECTOR_UTP: 796 if (sc->ep_connectors & UTP) { 797 GO_WINDOW(4); 798 outw(BASE + EP_W4_MEDIA_TYPE, ENABLE_UTP); 799 } 800 break; 801 case ACF_CONNECTOR_BNC: 802 if (sc->ep_connectors & BNC) { 803 outw(BASE + EP_COMMAND, START_TRANSCEIVER); 804 DELAY(DELAY_MULTIPLE * 1000); 805 } 806 break; 807 case ACF_CONNECTOR_AUI: 808 /* nothing to do */ 809 break; 810 default: 811 printf("ep%d: strange connector type in EEPROM: assuming AUI\n", 812 sc->unit); 813 break; 814 } 815 816 outw(BASE + EP_COMMAND, RX_ENABLE); 817 outw(BASE + EP_COMMAND, TX_ENABLE); 818 819 ifp->if_flags |= IFF_RUNNING; 820 ifp->if_flags &= ~IFF_OACTIVE; /* just in case */ 821 822#ifdef EP_LOCAL_STATS 823 sc->rx_no_first = sc->rx_no_mbuf = 824 sc->rx_bpf_disc = sc->rx_overrunf = sc->rx_overrunl = 825 sc->tx_underrun = 0; 826#endif 827 ep_fset(F_RX_FIRST); 828 if (sc->top) { 829 m_freem(sc->top); 830 sc->top = sc->mcur = 0; 831 } 832 outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_INIT_EARLY_THRESH); 833 outw(BASE + EP_COMMAND, SET_TX_START_THRESH | 16); 834 835 /* 836 * Store up a bunch of mbuf's for use later. (MAX_MBS). First we free up 837 * any that we had in case we're being called from intr or somewhere 838 * else. 839 */ 840 841 GO_WINDOW(1); 842 epstart(ifp); 843 844 splx(s); 845} 846 847static const char padmap[] = {0, 3, 2, 1}; 848 849static void 850epstart(ifp) 851 struct ifnet *ifp; 852{ 853 register struct ep_softc *sc = ifp->if_softc; 854 register u_int len; 855 register struct mbuf *m; 856 struct mbuf *top; 857 int s, pad; 858 859 if (sc->gone) { 860 return; 861 } 862 863 s = splimp(); 864 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 865 if (ifp->if_flags & IFF_OACTIVE) { 866 splx(s); 867 return; 868 } 869startagain: 870 /* Sneak a peek at the next packet */ 871 m = ifp->if_snd.ifq_head; 872 if (m == 0) { 873 splx(s); 874 return; 875 } 876 for (len = 0, top = m; m; m = m->m_next) 877 len += m->m_len; 878 879 pad = padmap[len & 3]; 880 881 /* 882 * The 3c509 automatically pads short packets to minimum ethernet length, 883 * but we drop packets that are too large. Perhaps we should truncate 884 * them instead? 885 */ 886 if (len + pad > ETHER_MAX_LEN) { 887 /* packet is obviously too large: toss it */ 888 ++ifp->if_oerrors; 889 IF_DEQUEUE(&ifp->if_snd, m); 890 m_freem(m); 891 goto readcheck; 892 } 893 if (inw(BASE + EP_W1_FREE_TX) < len + pad + 4) { 894 /* no room in FIFO */ 895 outw(BASE + EP_COMMAND, SET_TX_AVAIL_THRESH | (len + pad + 4)); 896 /* make sure */ 897 if (inw(BASE + EP_W1_FREE_TX) < len + pad + 4) { 898 ifp->if_flags |= IFF_OACTIVE; 899 splx(s); 900 return; 901 } 902 } 903 IF_DEQUEUE(&ifp->if_snd, m); 904 905 outw(BASE + EP_W1_TX_PIO_WR_1, len); 906 outw(BASE + EP_W1_TX_PIO_WR_1, 0x0); /* Second dword meaningless */ 907 908 for (top = m; m != 0; m = m->m_next) 909 if (ep_ftst(F_ACCESS_32_BITS)) { 910 outsl(BASE + EP_W1_TX_PIO_WR_1, mtod(m, caddr_t), 911 m->m_len / 4); 912 if (m->m_len & 3) 913 outsb(BASE + EP_W1_TX_PIO_WR_1, 914 mtod(m, caddr_t) + (m->m_len & (~3)), 915 m->m_len & 3); 916 } else { 917 outsw(BASE + EP_W1_TX_PIO_WR_1, mtod(m, caddr_t), m->m_len / 2); 918 if (m->m_len & 1) 919 outb(BASE + EP_W1_TX_PIO_WR_1, 920 *(mtod(m, caddr_t) + m->m_len - 1)); 921 } 922 923 while (pad--) 924 outb(BASE + EP_W1_TX_PIO_WR_1, 0); /* Padding */ 925 926#if NBPF > 0 927 if (ifp->if_bpf) { 928 bpf_mtap(ifp, top); 929 } 930#endif 931 932 ifp->if_timer = 2; 933 ifp->if_opackets++; 934 m_freem(top); 935 936 /* 937 * Is another packet coming in? We don't want to overflow the tiny RX 938 * fifo. 939 */ 940readcheck: 941 if (inw(BASE + EP_W1_RX_STATUS) & RX_BYTES_MASK) { 942 /* 943 * we check if we have packets left, in that case we prepare to come 944 * back later 945 */ 946 if (ifp->if_snd.ifq_head) { 947 outw(BASE + EP_COMMAND, SET_TX_AVAIL_THRESH | 8); 948 } 949 splx(s); 950 return; 951 } 952 goto startagain; 953} 954 955static void 956epintr(unit) 957 int unit; 958{ 959 register struct ep_softc *sc = ep_softc[unit]; 960 961 if (sc->gone) { 962 return; 963 } 964 965 ep_intr(sc); 966} 967 968void 969ep_intr(arg) 970 void *arg; 971{ 972 struct ep_softc *sc; 973 register int status; 974 struct ifnet *ifp; 975 int x; 976 977 x = splbio(); 978 979 sc = (struct ep_softc *)arg; 980 981 ifp = &sc->arpcom.ac_if; 982 983 outw(BASE + EP_COMMAND, SET_INTR_MASK); /* disable all Ints */ 984 985rescan: 986 987 while ((status = inw(BASE + EP_STATUS)) & S_5_INTS) { 988 989 /* first acknowledge all interrupt sources */ 990 outw(BASE + EP_COMMAND, ACK_INTR | (status & S_MASK)); 991 992 if (status & (S_RX_COMPLETE | S_RX_EARLY)) { 993 epread(sc); 994 continue; 995 } 996 if (status & S_TX_AVAIL) { 997 /* we need ACK */ 998 ifp->if_timer = 0; 999 ifp->if_flags &= ~IFF_OACTIVE; 1000 GO_WINDOW(1); 1001 inw(BASE + EP_W1_FREE_TX); 1002 epstart(ifp); 1003 } 1004 if (status & S_CARD_FAILURE) { 1005 ifp->if_timer = 0; 1006#ifdef EP_LOCAL_STATS 1007 printf("\nep%d:\n\tStatus: %x\n", sc->unit, status); 1008 GO_WINDOW(4); 1009 printf("\tFIFO Diagnostic: %x\n", inw(BASE + EP_W4_FIFO_DIAG)); 1010 printf("\tStat: %x\n", sc->stat); 1011 printf("\tIpackets=%d, Opackets=%d\n", 1012 ifp->if_ipackets, ifp->if_opackets); 1013 printf("\tNOF=%d, NOMB=%d, BPFD=%d, RXOF=%d, RXOL=%d, TXU=%d\n", 1014 sc->rx_no_first, sc->rx_no_mbuf, sc->rx_bpf_disc, sc->rx_overrunf, 1015 sc->rx_overrunl, sc->tx_underrun); 1016#else 1017 1018#ifdef DIAGNOSTIC 1019 printf("ep%d: Status: %x (input buffer overflow)\n", sc->unit, status); 1020#else 1021 ++ifp->if_ierrors; 1022#endif 1023 1024#endif 1025 epinit(sc); 1026 splx(x); 1027 return; 1028 } 1029 if (status & S_TX_COMPLETE) { 1030 ifp->if_timer = 0; 1031 /* we need ACK. we do it at the end */ 1032 /* 1033 * We need to read TX_STATUS until we get a 0 status in order to 1034 * turn off the interrupt flag. 1035 */ 1036 while ((status = inb(BASE + EP_W1_TX_STATUS)) & TXS_COMPLETE) { 1037 if (status & TXS_SUCCES_INTR_REQ); 1038 else if (status & (TXS_UNDERRUN | TXS_JABBER | TXS_MAX_COLLISION)) { 1039 outw(BASE + EP_COMMAND, TX_RESET); 1040 if (status & TXS_UNDERRUN) { 1041#ifdef EP_LOCAL_STATS 1042 sc->tx_underrun++; 1043#endif 1044 } else { 1045 if (status & TXS_JABBER); 1046 else /* TXS_MAX_COLLISION - we shouldn't get here */ 1047 ++ifp->if_collisions; 1048 } 1049 ++ifp->if_oerrors; 1050 outw(BASE + EP_COMMAND, TX_ENABLE); 1051 /* 1052 * To have a tx_avail_int but giving the chance to the 1053 * Reception 1054 */ 1055 if (ifp->if_snd.ifq_head) { 1056 outw(BASE + EP_COMMAND, SET_TX_AVAIL_THRESH | 8); 1057 } 1058 } 1059 outb(BASE + EP_W1_TX_STATUS, 0x0); /* pops up the next 1060 * status */ 1061 } /* while */ 1062 ifp->if_flags &= ~IFF_OACTIVE; 1063 GO_WINDOW(1); 1064 inw(BASE + EP_W1_FREE_TX); 1065 epstart(ifp); 1066 } /* end TX_COMPLETE */ 1067 } 1068 1069 outw(BASE + EP_COMMAND, C_INTR_LATCH); /* ACK int Latch */ 1070 1071 if ((status = inw(BASE + EP_STATUS)) & S_5_INTS) 1072 goto rescan; 1073 1074 /* re-enable Ints */ 1075 outw(BASE + EP_COMMAND, SET_INTR_MASK | S_5_INTS); 1076 1077 splx(x); 1078} 1079 1080static void 1081epread(sc) 1082 register struct ep_softc *sc; 1083{ 1084 struct ether_header *eh; 1085 struct mbuf *top, *mcur, *m; 1086 struct ifnet *ifp; 1087 int lenthisone; 1088 1089 short rx_fifo2, status; 1090 register short rx_fifo; 1091 1092 ifp = &sc->arpcom.ac_if; 1093 status = inw(BASE + EP_W1_RX_STATUS); 1094 1095read_again: 1096 1097 if (status & ERR_RX) { 1098 ++ifp->if_ierrors; 1099 if (status & ERR_RX_OVERRUN) { 1100 /* 1101 * we can think the rx latency is actually greather than we 1102 * expect 1103 */ 1104#ifdef EP_LOCAL_STATS 1105 if (ep_ftst(F_RX_FIRST)) 1106 sc->rx_overrunf++; 1107 else 1108 sc->rx_overrunl++; 1109#endif 1110 } 1111 goto out; 1112 } 1113 rx_fifo = rx_fifo2 = status & RX_BYTES_MASK; 1114 1115 if (ep_ftst(F_RX_FIRST)) { 1116 MGETHDR(m, M_DONTWAIT, MT_DATA); 1117 if (!m) 1118 goto out; 1119 if (rx_fifo >= MINCLSIZE) 1120 MCLGET(m, M_DONTWAIT); 1121 sc->top = sc->mcur = top = m; 1122#define EROUND ((sizeof(struct ether_header) + 3) & ~3) 1123#define EOFF (EROUND - sizeof(struct ether_header)) 1124 top->m_data += EOFF; 1125 1126 /* Read what should be the header. */ 1127 insw(BASE + EP_W1_RX_PIO_RD_1, 1128 mtod(top, caddr_t), sizeof(struct ether_header) / 2); 1129 top->m_len = sizeof(struct ether_header); 1130 rx_fifo -= sizeof(struct ether_header); 1131 sc->cur_len = rx_fifo2; 1132 } else { 1133 /* come here if we didn't have a complete packet last time */ 1134 top = sc->top; 1135 m = sc->mcur; 1136 sc->cur_len += rx_fifo2; 1137 } 1138 1139 /* Reads what is left in the RX FIFO */ 1140 while (rx_fifo > 0) { 1141 lenthisone = min(rx_fifo, M_TRAILINGSPACE(m)); 1142 if (lenthisone == 0) { /* no room in this one */ 1143 mcur = m; 1144 MGET(m, M_DONTWAIT, MT_DATA); 1145 if (!m) 1146 goto out; 1147 if (rx_fifo >= MINCLSIZE) 1148 MCLGET(m, M_DONTWAIT); 1149 m->m_len = 0; 1150 mcur->m_next = m; 1151 lenthisone = min(rx_fifo, M_TRAILINGSPACE(m)); 1152 } 1153 if (ep_ftst(F_ACCESS_32_BITS)) { /* default for EISA configured cards*/ 1154 insl(BASE + EP_W1_RX_PIO_RD_1, mtod(m, caddr_t) + m->m_len, 1155 lenthisone / 4); 1156 m->m_len += (lenthisone & ~3); 1157 if (lenthisone & 3) 1158 insb(BASE + EP_W1_RX_PIO_RD_1, 1159 mtod(m, caddr_t) + m->m_len, 1160 lenthisone & 3); 1161 m->m_len += (lenthisone & 3); 1162 } else { 1163 insw(BASE + EP_W1_RX_PIO_RD_1, mtod(m, caddr_t) + m->m_len, 1164 lenthisone / 2); 1165 m->m_len += lenthisone; 1166 if (lenthisone & 1) 1167 *(mtod(m, caddr_t) + m->m_len - 1) = inb(BASE + EP_W1_RX_PIO_RD_1); 1168 } 1169 rx_fifo -= lenthisone; 1170 } 1171 1172 if (status & ERR_RX_INCOMPLETE) { /* we haven't received the complete 1173 * packet */ 1174 sc->mcur = m; 1175#ifdef EP_LOCAL_STATS 1176 sc->rx_no_first++; /* to know how often we come here */ 1177#endif 1178 ep_frst(F_RX_FIRST); 1179 if (!((status = inw(BASE + EP_W1_RX_STATUS)) & ERR_RX_INCOMPLETE)) { 1180 /* we see if by now, the packet has completly arrived */ 1181 goto read_again; 1182 } 1183 outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_NEXT_EARLY_THRESH); 1184 return; 1185 } 1186 outw(BASE + EP_COMMAND, RX_DISCARD_TOP_PACK); 1187 ++ifp->if_ipackets; 1188 ep_fset(F_RX_FIRST); 1189 top->m_pkthdr.rcvif = &sc->arpcom.ac_if; 1190 top->m_pkthdr.len = sc->cur_len; 1191 1192#if NBPF > 0 1193 if (ifp->if_bpf) { 1194 bpf_mtap(ifp, top); 1195 1196 /* 1197 * Note that the interface cannot be in promiscuous mode if there are 1198 * no BPF listeners. And if we are in promiscuous mode, we have to 1199 * check if this packet is really ours. 1200 */ 1201 eh = mtod(top, struct ether_header *); 1202 if ((ifp->if_flags & IFF_PROMISC) && 1203 (eh->ether_dhost[0] & 1) == 0 && 1204 bcmp(eh->ether_dhost, sc->arpcom.ac_enaddr, 1205 sizeof(eh->ether_dhost)) != 0 && 1206 bcmp(eh->ether_dhost, etherbroadcastaddr, 1207 sizeof(eh->ether_dhost)) != 0) { 1208 if (sc->top) { 1209 m_freem(sc->top); 1210 sc->top = 0; 1211 } 1212 ep_fset(F_RX_FIRST); 1213#ifdef EP_LOCAL_STATS 1214 sc->rx_bpf_disc++; 1215#endif 1216 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 1217 outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_INIT_EARLY_THRESH); 1218 return; 1219 } 1220 } 1221#endif 1222 1223 eh = mtod(top, struct ether_header *); 1224 m_adj(top, sizeof(struct ether_header)); 1225 ether_input(ifp, eh, top); 1226 sc->top = 0; 1227 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 1228 outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_INIT_EARLY_THRESH); 1229 return; 1230 1231out: 1232 outw(BASE + EP_COMMAND, RX_DISCARD_TOP_PACK); 1233 if (sc->top) { 1234 m_freem(sc->top); 1235 sc->top = 0; 1236#ifdef EP_LOCAL_STATS 1237 sc->rx_no_mbuf++; 1238#endif 1239 } 1240 ep_fset(F_RX_FIRST); 1241 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 1242 outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_INIT_EARLY_THRESH); 1243} 1244 1245/* 1246 * Look familiar? 1247 */ 1248static int 1249epioctl(ifp, cmd, data) 1250 register struct ifnet *ifp; 1251 u_long cmd; 1252 caddr_t data; 1253{ 1254 struct ep_softc *sc = ifp->if_softc; 1255 int s, error = 0; 1256 1257 s = splimp(); 1258 1259 switch (cmd) { 1260 case SIOCSIFADDR: 1261 case SIOCGIFADDR: 1262 case SIOCSIFMTU: 1263 error = ether_ioctl(ifp, cmd, data); 1264 break; 1265 1266 case SIOCSIFFLAGS: 1267 1268 if ((ifp->if_flags & IFF_UP) == 0 && ifp->if_flags & IFF_RUNNING) { 1269 ifp->if_flags &= ~IFF_RUNNING; 1270 epstop(sc); 1271 break; 1272 } else { 1273 /* reinitialize card on any parameter change */ 1274 epinit(sc); 1275 break; 1276 } 1277 1278 /* NOTREACHED */ 1279 break; 1280#ifdef notdef 1281 case SIOCGHWADDR: 1282 bcopy((caddr_t) sc->sc_addr, (caddr_t) & ifr->ifr_data, 1283 sizeof(sc->sc_addr)); 1284 break; 1285#endif 1286 case SIOCADDMULTI: 1287 case SIOCDELMULTI: 1288 /* 1289 * The Etherlink III has no programmable multicast 1290 * filter. We always initialize the card to be 1291 * promiscuous to multicast, since we're always a 1292 * member of the ALL-SYSTEMS group, so there's no 1293 * need to process SIOC*MULTI requests. 1294 */ 1295 error = 0; 1296 break; 1297 default: 1298 error = EINVAL; 1299 } 1300 1301 splx(s); 1302 1303 return (error); 1304} 1305 1306static void 1307epwatchdog(ifp) 1308 struct ifnet *ifp; 1309{ 1310 struct ep_softc *sc = ifp->if_softc; 1311 1312 /* 1313 printf("ep: watchdog\n"); 1314 1315 log(LOG_ERR, "ep%d: watchdog\n", ifp->if_unit); 1316 ifp->if_oerrors++; 1317 */ 1318 1319 if (sc->gone) { 1320 return; 1321 } 1322 1323 ifp->if_flags &= ~IFF_OACTIVE; 1324 epstart(ifp); 1325 ep_intr(ifp->if_softc); 1326} 1327 1328static void 1329epstop(sc) 1330 struct ep_softc *sc; 1331{ 1332 if (sc->gone) { 1333 return; 1334 } 1335 1336 outw(BASE + EP_COMMAND, RX_DISABLE); 1337 outw(BASE + EP_COMMAND, RX_DISCARD_TOP_PACK); 1338 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 1339 outw(BASE + EP_COMMAND, TX_DISABLE); 1340 outw(BASE + EP_COMMAND, STOP_TRANSCEIVER); 1341 outw(BASE + EP_COMMAND, RX_RESET); 1342 outw(BASE + EP_COMMAND, TX_RESET); 1343 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 1344 outw(BASE + EP_COMMAND, C_INTR_LATCH); 1345 outw(BASE + EP_COMMAND, SET_RD_0_MASK); 1346 outw(BASE + EP_COMMAND, SET_INTR_MASK); 1347 outw(BASE + EP_COMMAND, SET_RX_FILTER); 1348} 1349 1350 1351#if 0 1352static int 1353send_ID_sequence(port) 1354 int port; 1355{ 1356 int cx, al; 1357 1358 for (al = 0xff, cx = 0; cx < 255; cx++) { 1359 outb(port, al); 1360 al <<= 1; 1361 if (al & 0x100) 1362 al ^= 0xcf; 1363 } 1364 return (1); 1365} 1366#endif 1367 1368 1369/* 1370 * We get eeprom data from the id_port given an offset into the eeprom. 1371 * Basically; after the ID_sequence is sent to all of the cards; they enter 1372 * the ID_CMD state where they will accept command requests. 0x80-0xbf loads 1373 * the eeprom data. We then read the port 16 times and with every read; the 1374 * cards check for contention (ie: if one card writes a 0 bit and another 1375 * writes a 1 bit then the host sees a 0. At the end of the cycle; each card 1376 * compares the data on the bus; if there is a difference then that card goes 1377 * into ID_WAIT state again). In the meantime; one bit of data is returned in 1378 * the AX register which is conveniently returned to us by inb(). Hence; we 1379 * read 16 times getting one bit of data with each read. 1380 */ 1381 1382static int 1383get_eeprom_data(id_port, offset) 1384 int id_port; 1385 int offset; 1386{ 1387 int i, data = 0; 1388 outb(id_port, 0x80 + offset); 1389 for (i = 0; i < 16; i++) { 1390 DELAY(BIT_DELAY_MULTIPLE * 1000); 1391 data = (data << 1) | (inw(id_port) & 1); 1392 } 1393 return (data); 1394} 1395 1396#endif /* NEP > 0 */ 1397