if_ep.c revision 51646
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 51646 1999-09-25 12:06:01Z phk $ 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 "opt_inet.h" 63#include "opt_ipx.h" 64 65#include <sys/param.h> 66#if defined(__FreeBSD__) 67#include <sys/kernel.h> 68#include <sys/systm.h> 69#endif 70#include <sys/malloc.h> 71#include <sys/mbuf.h> 72#include <sys/socket.h> 73#include <sys/sockio.h> 74#if defined(__NetBSD__) 75#include <sys/select.h> 76#endif 77 78#include <net/ethernet.h> 79#include <net/if.h> 80 81#include <netinet/in.h> 82#include <netinet/if_ether.h> 83 84#include <net/bpf.h> 85 86#if defined(__FreeBSD__) 87#include <machine/clock.h> 88#endif 89 90#include <i386/isa/isa_device.h> 91#include <i386/isa/if_epreg.h> 92#include <i386/isa/elink.h> 93 94/* DELAY_MULTIPLE: How much to boost "base" delays, except 95 * for the inter-bit delays in get_eeprom_data. A cyrix Media GX needed this. 96 */ 97#define DELAY_MULTIPLE 10 98#define BIT_DELAY_MULTIPLE 10 99 100/* Exported variables */ 101u_long ep_unit; 102int ep_boards; 103struct ep_board ep_board[EP_MAX_BOARDS + 1]; 104 105static int eeprom_rdy __P((struct ep_softc *sc)); 106 107static int ep_isa_probe __P((struct isa_device *)); 108static struct ep_board * ep_look_for_board_at __P((struct isa_device *is)); 109static int ep_isa_attach __P((struct isa_device *)); 110static int epioctl __P((struct ifnet * ifp, u_long, caddr_t)); 111 112static void epinit __P((void *)); 113static ointhand2_t epintr; 114static void epread __P((struct ep_softc *)); 115void epreset __P((int)); 116static void epstart __P((struct ifnet *)); 117static void epstop __P((struct ep_softc *)); 118static void epwatchdog __P((struct ifnet *)); 119 120#if 0 121static int send_ID_sequence __P((int)); 122#endif 123static int get_eeprom_data __P((int, int)); 124 125static struct ep_softc* ep_softc[NEP]; 126static int ep_current_tag = EP_LAST_TAG + 1; 127static char *ep_conn_type[] = {"UTP", "AUI", "???", "BNC"}; 128 129#define ep_ftst(f) (sc->stat&(f)) 130#define ep_fset(f) (sc->stat|=(f)) 131#define ep_frst(f) (sc->stat&=~(f)) 132 133struct isa_driver epdriver = { 134 ep_isa_probe, 135 ep_isa_attach, 136 "ep", 137 0 138}; 139 140#include "card.h" 141 142#if NCARD > 0 143#include <sys/select.h> 144#include <sys/module.h> 145#include <pccard/cardinfo.h> 146#include <pccard/slot.h> 147 148/* 149 * PC-Card (PCMCIA) specific code. 150 */ 151static int ep_pccard_init __P((struct pccard_devinfo *)); 152static int ep_pccard_attach __P((struct pccard_devinfo *)); 153static void ep_unload __P((struct pccard_devinfo *)); 154static int card_intr __P((struct pccard_devinfo *)); 155static int ep_pccard_identify (struct ep_board *epb, int unit); 156 157PCCARD_MODULE(ep, ep_pccard_init, ep_unload, card_intr, 0, net_imask); 158 159/* 160 * Initialize the device - called from Slot manager. 161 */ 162static int 163ep_pccard_init(devi) 164 struct pccard_devinfo *devi; 165{ 166 struct isa_device *is = &devi->isahd; 167 struct ep_softc *sc = ep_softc[is->id_unit]; 168 struct ep_board *epb; 169 int i; 170 171 epb = &ep_board[is->id_unit]; 172 173 if (sc == 0) { 174 if ((sc = ep_alloc(is->id_unit, epb)) == 0) { 175 return (ENXIO); 176 } 177 ep_unit++; 178 } 179 180 /* get_e() requires these. */ 181 sc->ep_io_addr = is->id_iobase; 182 sc->unit = is->id_unit; 183 epb->epb_addr = is->id_iobase; 184 epb->epb_used = 1; 185 186 /* 187 * XXX - Certain (newer?) 3Com cards need epb->cmd_off == 2. Sadly, 188 * you need to have a correct cmd_off in order to identify the card. 189 * So we have to hit it with both and cross our virtual fingers. There's 190 * got to be a better way to do this. jyoung@accessus.net 09/11/1999 191 */ 192 193 epb->cmd_off = 0; 194 epb->prod_id = get_e(sc, EEPROM_PROD_ID); 195 if (!ep_pccard_identify(epb, is->id_unit)) { 196 if (bootverbose) printf("ep%d: Pass 1 of 2 detection failed (nonfatal)\n", is->id_unit); 197 epb->cmd_off = 2; 198 epb->prod_id = get_e(sc, EEPROM_PROD_ID); 199 if (!ep_pccard_identify(epb, is->id_unit)) { 200 if (bootverbose) printf("ep%d: Pass 2 of 2 detection failed (fatal!)\n", is->id_unit); 201 printf("ep%d: Unit failed to come ready or product ID unknown! (id 0x%x)\n", is->id_unit, epb->prod_id); 202 return (ENXIO); 203 } 204 } 205 206 epb->res_cfg = get_e(sc, EEPROM_RESOURCE_CFG); 207 for (i = 0; i < 3; i++) 208 sc->epb->eth_addr[i] = get_e(sc, EEPROM_NODE_ADDR_0 + i); 209 210 if (ep_pccard_attach(devi) == 0) 211 return (ENXIO); 212 213 sc->arpcom.ac_if.if_snd.ifq_maxlen = ifqmaxlen; 214 return (0); 215} 216 217static int 218ep_pccard_identify(epb, unit) 219 struct ep_board *epb; 220 int unit; 221{ 222 /* Determine device type and associated MII capabilities */ 223 switch (epb->prod_id) { 224 case 0x6055: /* 3C556 */ 225 if (bootverbose) printf("ep%d: 3Com 3C556\n", unit); 226 epb->mii_trans = 1; 227 return (1); 228 break; /* NOTREACHED */ 229 case 0x4057: /* 3C574 */ 230 if (bootverbose) printf("ep%d: 3Com 3C574\n", unit); 231 epb->mii_trans = 1; 232 return (1); 233 break; /* NOTREACHED */ 234 case 0x4b57: /* 3C574B */ 235 if (bootverbose) printf("ep%d: 3Com 3C574B, Megahertz 3CCFE574BT or Fast Etherlink 3C574-TX\n", unit); 236 epb->mii_trans = 1; 237 return (1); 238 break; /* NOTREACHED */ 239 case 0x9058: /* 3C589 */ 240 if (bootverbose) printf("ep%d: 3Com Etherlink III 3C589[B/C/D]\n", unit); 241 epb->mii_trans = 0; 242 return (1); 243 break; /* NOTREACHED */ 244 } 245 return (0); 246} 247 248static int 249ep_pccard_attach(devi) 250 struct pccard_devinfo *devi; 251{ 252 struct isa_device *is = &devi->isahd; 253 struct ep_softc *sc = ep_softc[is->id_unit]; 254 u_short config; 255 256 sc->ep_connectors = 0; 257 config = inw(IS_BASE + EP_W0_CONFIG_CTRL); 258 if (config & IS_BNC) { 259 sc->ep_connectors |= BNC; 260 } 261 if (config & IS_UTP) { 262 sc->ep_connectors |= UTP; 263 } 264 if (!(sc->ep_connectors & 7)) 265 /* (Apparently) non-fatal */ 266 if(bootverbose) printf("ep%d: No connectors or MII.\n", is->id_unit); 267 268 sc->ep_connector = inw(BASE + EP_W0_ADDRESS_CFG) >> ACF_CONNECTOR_BITS; 269 270 /* ROM size = 0, ROM base = 0 */ 271 /* For now, ignore AUTO SELECT feature of 3C589B and later. */ 272 outw(BASE + EP_W0_ADDRESS_CFG, get_e(sc, EEPROM_ADDR_CFG) & 0xc000); 273 274 /* Fake IRQ must be 3 */ 275 outw(BASE + EP_W0_RESOURCE_CFG, (sc->epb->res_cfg & 0x0fff) | 0x3000); 276 277 outw(BASE + EP_W0_PRODUCT_ID, sc->epb->prod_id); 278 279 if (sc->epb->mii_trans) { 280 /* 281 * turn on the MII transciever 282 */ 283 GO_WINDOW(3); 284 outw(BASE + EP_W3_OPTIONS, 0x8040); 285 DELAY(1000); 286 outw(BASE + EP_W3_OPTIONS, 0xc040); 287 outw(BASE + EP_COMMAND, RX_RESET); 288 outw(BASE + EP_COMMAND, TX_RESET); 289 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 290 DELAY(1000); 291 outw(BASE + EP_W3_OPTIONS, 0x8040); 292 } 293 294 ep_attach(sc); 295 296 return 1; 297} 298 299static void 300ep_unload(devi) 301 struct pccard_devinfo *devi; 302{ 303 struct ep_softc *sc = ep_softc[devi->isahd.id_unit]; 304 305 if (sc->gone) { 306 printf("ep%d: already unloaded\n", devi->isahd.id_unit); 307 return; 308 } 309 sc->arpcom.ac_if.if_flags &= ~IFF_RUNNING; 310 sc->gone = 1; 311 printf("ep%d: unload\n", devi->isahd.id_unit); 312} 313 314/* 315 * card_intr - Shared interrupt called from 316 * front end of PC-Card handler. 317 */ 318static int 319card_intr(devi) 320 struct pccard_devinfo *devi; 321{ 322 epintr(devi->isahd.id_unit); 323 return(1); 324} 325#endif /* NCARD > 0 */ 326 327static int 328eeprom_rdy(sc) 329 struct ep_softc *sc; 330{ 331 int i; 332 333 for (i = 0; is_eeprom_busy(BASE) && i < MAX_EEPROMBUSY; i++) 334 continue; 335 if (i >= MAX_EEPROMBUSY) { 336 printf("ep%d: eeprom failed to come ready.\n", sc->unit); 337 return (0); 338 } 339 return (1); 340} 341 342static struct ep_board * 343ep_look_for_board_at(is) 344 struct isa_device *is; 345{ 346 int data, i, j, id_port = ELINK_ID_PORT; 347 int count = 0; 348 349 if (ep_current_tag == (EP_LAST_TAG + 1)) { 350 /* Come here just one time */ 351 352 ep_current_tag--; 353 354 /* Look for the ISA boards. Init and leave them actived */ 355 outb(id_port, 0); 356 outb(id_port, 0); 357 358 elink_idseq(0xCF); 359 360 elink_reset(); 361 DELAY(DELAY_MULTIPLE * 10000); 362 for (i = 0; i < EP_MAX_BOARDS; i++) { 363 outb(id_port, 0); 364 outb(id_port, 0); 365 elink_idseq(0xCF); 366 367 data = get_eeprom_data(id_port, EEPROM_MFG_ID); 368 if (data != MFG_ID) 369 break; 370 371 /* resolve contention using the Ethernet address */ 372 373 for (j = 0; j < 3; j++) 374 get_eeprom_data(id_port, j); 375 376 /* and save this address for later use */ 377 378 for (j = 0; j < 3; j++) 379 ep_board[ep_boards].eth_addr[j] = get_eeprom_data(id_port, j); 380 381 ep_board[ep_boards].res_cfg = 382 get_eeprom_data(id_port, EEPROM_RESOURCE_CFG); 383 384 ep_board[ep_boards].prod_id = 385 get_eeprom_data(id_port, EEPROM_PROD_ID); 386 387 ep_board[ep_boards].epb_used = 0; 388#ifdef PC98 389 ep_board[ep_boards].epb_addr = 390 (get_eeprom_data(id_port, EEPROM_ADDR_CFG) & 0x1f) * 0x100 + 0x40d0; 391#else 392 ep_board[ep_boards].epb_addr = 393 (get_eeprom_data(id_port, EEPROM_ADDR_CFG) & 0x1f) * 0x10 + 0x200; 394 395 if (ep_board[ep_boards].epb_addr > 0x3E0) 396 /* Board in EISA configuration mode */ 397 continue; 398#endif /* PC98 */ 399 400 outb(id_port, ep_current_tag); /* tags board */ 401 outb(id_port, ACTIVATE_ADAPTER_TO_CONFIG); 402 ep_boards++; 403 count++; 404 ep_current_tag--; 405 } 406 407 ep_board[ep_boards].epb_addr = 0; 408 if (count) { 409 printf("%d 3C5x9 board(s) on ISA found at", count); 410 for (j = 0; ep_board[j].epb_addr; j++) 411 if (ep_board[j].epb_addr <= 0x3E0) 412 printf(" 0x%x", ep_board[j].epb_addr); 413 printf("\n"); 414 } 415 } 416 417 /* we have two cases: 418 * 419 * 1. Device was configured with 'port ?' 420 * In this case we search for the first unused card in list 421 * 422 * 2. Device was configured with 'port xxx' 423 * In this case we search for the unused card with that address 424 * 425 */ 426 427 if (IS_BASE == -1) { /* port? */ 428 for (i = 0; ep_board[i].epb_addr && ep_board[i].epb_used; i++) 429 ; 430 if (ep_board[i].epb_addr == 0) 431 return 0; 432 433 IS_BASE = ep_board[i].epb_addr; 434 ep_board[i].epb_used = 1; 435 436 return &ep_board[i]; 437 } else { 438 for (i = 0; 439 ep_board[i].epb_addr && ep_board[i].epb_addr != IS_BASE; 440 i++) 441 ; 442 443 if (ep_board[i].epb_used || ep_board[i].epb_addr != IS_BASE) 444 return 0; 445 446 if (inw(IS_BASE + EP_W0_EEPROM_COMMAND) & EEPROM_TST_MODE) { 447 printf("ep%d: 3c5x9 at 0x%x in PnP mode. Disable PnP mode!\n", 448 is->id_unit, IS_BASE); 449 } 450 ep_board[i].epb_used = 1; 451 452 return &ep_board[i]; 453 } 454} 455 456/* 457 * get_e: gets a 16 bits word from the EEPROM. we must have set the window 458 * before 459 */ 460u_int16_t 461get_e(sc, offset) 462 struct ep_softc *sc; 463 int offset; 464{ 465 if (!eeprom_rdy(sc)) 466 return (0xffff); 467 outw(BASE + EP_W0_EEPROM_COMMAND, (EEPROM_CMD_RD << sc->epb->cmd_off) | offset); 468 if (!eeprom_rdy(sc)) 469 return (0xffff); 470 return (inw(BASE + EP_W0_EEPROM_DATA)); 471} 472 473struct ep_softc * 474ep_alloc(unit, epb) 475 int unit; 476 struct ep_board *epb; 477{ 478 struct ep_softc *sc; 479 480 if (unit >= NEP) { 481 printf("ep: unit number (%d) too high\n", unit); 482 return NULL; 483 } 484 485 /* 486 * Allocate a storage area for us 487 */ 488 if (ep_softc[unit]) { 489 printf("ep%d: unit number already allocated to another " 490 "adaptor\n", unit); 491 return NULL; 492 } 493 494 sc = malloc(sizeof(struct ep_softc), M_DEVBUF, M_NOWAIT); 495 if (!sc) { 496 printf("ep%d: cannot malloc!\n", unit); 497 return NULL; 498 } 499 bzero(sc, sizeof(struct ep_softc)); 500 ep_softc[unit] = sc; 501 sc->unit = unit; 502 sc->ep_io_addr = epb->epb_addr; 503 sc->epb = epb; 504 505 return(sc); 506} 507 508void 509ep_free(sc) 510 struct ep_softc *sc; 511{ 512 ep_softc[sc->unit] = NULL; 513 free(sc, M_DEVBUF); 514 return; 515} 516 517int 518ep_isa_probe(is) 519 struct isa_device *is; 520{ 521 struct ep_softc *sc; 522 struct ep_board *epb; 523 u_short k; 524 525 if ((epb = ep_look_for_board_at(is)) == 0) 526 return (0); 527 528 /* 529 * Allocate a storage area for us 530 */ 531 sc = ep_alloc(ep_unit, epb); 532 if (!sc) 533 return (0); 534 535 is->id_unit = ep_unit++; 536 537 /* 538 * The iobase was found and MFG_ID was 0x6d50. PROD_ID should be 539 * 0x9[0-f]50 (IBM-PC) 540 * 0x9[0-f]5[0-f] (PC-98) 541 */ 542 GO_WINDOW(0); 543 k = sc->epb->prod_id; 544#ifdef PC98 545 if ((k & 0xf0f0) != (PROD_ID & 0xf0f0)) { 546#else 547 if ((k & 0xf0ff) != (PROD_ID & 0xf0ff)) { 548#endif 549 printf("ep_isa_probe: ignoring model %04x\n", k); 550 ep_free(sc); 551 return (0); 552 } 553 554 k = sc->epb->res_cfg; 555 556 k >>= 12; 557 558 /* Now we have two cases again: 559 * 560 * 1. Device was configured with 'irq?' 561 * In this case we use irq read from the board 562 * 563 * 2. Device was configured with 'irq xxx' 564 * In this case we set up the board to use specified interrupt 565 * 566 */ 567 568 if (is->id_irq == 0) { /* irq? */ 569 is->id_irq = 1 << ((k == 2) ? 9 : k); 570 } 571 572 sc->stat = 0; /* 16 bit access */ 573 574 /* By now, the adapter is already activated */ 575 576 return (EP_IOSIZE); /* 16 bytes of I/O space used. */ 577} 578 579static int 580ep_isa_attach(is) 581 struct isa_device *is; 582{ 583 struct ep_softc *sc = ep_softc[is->id_unit]; 584 u_short config; 585 int irq; 586 587 is->id_ointr = epintr; 588 sc->ep_connectors = 0; 589 config = inw(IS_BASE + EP_W0_CONFIG_CTRL); 590 if (config & IS_AUI) { 591 sc->ep_connectors |= AUI; 592 } 593 if (config & IS_BNC) { 594 sc->ep_connectors |= BNC; 595 } 596 if (config & IS_UTP) { 597 sc->ep_connectors |= UTP; 598 } 599 if (!(sc->ep_connectors & 7)) 600 printf("no connectors!"); 601 sc->ep_connector = inw(BASE + EP_W0_ADDRESS_CFG) >> ACF_CONNECTOR_BITS; 602 /* 603 * Write IRQ value to board 604 */ 605 606 irq = ffs(is->id_irq) - 1; 607 if (irq == -1) { 608 printf(" invalid irq... cannot attach\n"); 609 return 0; 610 } 611 612 GO_WINDOW(0); 613 SET_IRQ(BASE, irq); 614 615 ep_attach(sc); 616 return 1; 617} 618 619int 620ep_attach(sc) 621 struct ep_softc *sc; 622{ 623 struct ifnet *ifp = &sc->arpcom.ac_if; 624 u_short *p; 625 int i; 626 int attached; 627 628 sc->gone = 0; 629 attached = (ifp->if_softc != 0); 630 631 printf("ep%d: ", sc->unit); 632 /* 633 * Current media type 634 */ 635 if (sc->ep_connectors & AUI) { 636 printf("aui"); 637 if (sc->ep_connectors & ~AUI) 638 printf("/"); 639 } 640 if (sc->ep_connectors & UTP) { 641 printf("utp"); 642 if (sc->ep_connectors & BNC) 643 printf("/"); 644 } 645 if (sc->ep_connectors & BNC) { 646 printf("bnc"); 647 } 648 649 printf("[*%s*]", ep_conn_type[sc->ep_connector]); 650 651 /* 652 * Setup the station address 653 */ 654 p = (u_short *) & sc->arpcom.ac_enaddr; 655 GO_WINDOW(2); 656 for (i = 0; i < 3; i++) { 657 p[i] = htons(sc->epb->eth_addr[i]); 658 outw(BASE + EP_W2_ADDR_0 + (i * 2), ntohs(p[i])); 659 } 660 printf(" address %6D\n", sc->arpcom.ac_enaddr, ":"); 661 662 ifp->if_softc = sc; 663 ifp->if_unit = sc->unit; 664 ifp->if_name = "ep"; 665 ifp->if_mtu = ETHERMTU; 666 ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST; 667 ifp->if_output = ether_output; 668 ifp->if_start = epstart; 669 ifp->if_ioctl = epioctl; 670 ifp->if_watchdog = epwatchdog; 671 ifp->if_init = epinit; 672 673 if (!attached) { 674 if_attach(ifp); 675 ether_ifattach(ifp); 676 } 677 678#ifdef EP_LOCAL_STATS 679 sc->rx_no_first = sc->rx_no_mbuf = 680 sc->rx_bpf_disc = sc->rx_overrunf = sc->rx_overrunl = 681 sc->tx_underrun = 0; 682#endif 683 ep_fset(F_RX_FIRST); 684 sc->top = sc->mcur = 0; 685 686 if (!attached) { 687 bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header)); 688 } 689 return 0; 690} 691 692 693/* 694 * The order in here seems important. Otherwise we may not receive 695 * interrupts. ?! 696 */ 697static void 698epinit(xsc) 699 void *xsc; 700{ 701 struct ep_softc *sc = xsc; 702 register struct ifnet *ifp = &sc->arpcom.ac_if; 703 int s, i, j; 704 705 if (sc->gone) 706 return; 707 708 /* 709 if (ifp->if_addrlist == (struct ifaddr *) 0) 710 return; 711 */ 712 713 s = splimp(); 714 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 715 716 GO_WINDOW(0); 717 outw(BASE + EP_COMMAND, STOP_TRANSCEIVER); 718 GO_WINDOW(4); 719 outw(BASE + EP_W4_MEDIA_TYPE, DISABLE_UTP); 720 GO_WINDOW(0); 721 722 /* Disable the card */ 723 outw(BASE + EP_W0_CONFIG_CTRL, 0); 724 725 /* Enable the card */ 726 outw(BASE + EP_W0_CONFIG_CTRL, ENABLE_DRQ_IRQ); 727 728 GO_WINDOW(2); 729 730 /* Reload the ether_addr. */ 731 for (i = 0; i < 6; i++) 732 outb(BASE + EP_W2_ADDR_0 + i, sc->arpcom.ac_enaddr[i]); 733 734 outw(BASE + EP_COMMAND, RX_RESET); 735 outw(BASE + EP_COMMAND, TX_RESET); 736 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 737 738 /* Window 1 is operating window */ 739 GO_WINDOW(1); 740 for (i = 0; i < 31; i++) 741 inb(BASE + EP_W1_TX_STATUS); 742 743 /* get rid of stray intr's */ 744 outw(BASE + EP_COMMAND, ACK_INTR | 0xff); 745 746 outw(BASE + EP_COMMAND, SET_RD_0_MASK | S_5_INTS); 747 748 outw(BASE + EP_COMMAND, SET_INTR_MASK | S_5_INTS); 749 750 if (ifp->if_flags & IFF_PROMISC) 751 outw(BASE + EP_COMMAND, SET_RX_FILTER | FIL_INDIVIDUAL | 752 FIL_GROUP | FIL_BRDCST | FIL_ALL); 753 else 754 outw(BASE + EP_COMMAND, SET_RX_FILTER | FIL_INDIVIDUAL | 755 FIL_GROUP | FIL_BRDCST); 756 757 /* 758 * S.B. 759 * 760 * Now behavior was slightly changed: 761 * 762 * if any of flags link[0-2] is used and its connector is 763 * physically present the following connectors are used: 764 * 765 * link0 - AUI * highest precedence 766 * link1 - BNC 767 * link2 - UTP * lowest precedence 768 * 769 * If none of them is specified then 770 * connector specified in the EEPROM is used 771 * (if present on card or AUI if not). 772 * 773 */ 774 775 /* Set the xcvr. */ 776 if (ifp->if_flags & IFF_LINK0 && sc->ep_connectors & AUI) { 777 i = ACF_CONNECTOR_AUI; 778 } else if (ifp->if_flags & IFF_LINK1 && sc->ep_connectors & BNC) { 779 i = ACF_CONNECTOR_BNC; 780 } else if (ifp->if_flags & IFF_LINK2 && sc->ep_connectors & UTP) { 781 i = ACF_CONNECTOR_UTP; 782 } else { 783 i = sc->ep_connector; 784 } 785 GO_WINDOW(0); 786 j = inw(BASE + EP_W0_ADDRESS_CFG) & 0x3fff; 787 outw(BASE + EP_W0_ADDRESS_CFG, j | (i << ACF_CONNECTOR_BITS)); 788 789 switch(i) { 790 case ACF_CONNECTOR_UTP: 791 if (sc->ep_connectors & UTP) { 792 GO_WINDOW(4); 793 outw(BASE + EP_W4_MEDIA_TYPE, ENABLE_UTP); 794 } 795 break; 796 case ACF_CONNECTOR_BNC: 797 if (sc->ep_connectors & BNC) { 798 outw(BASE + EP_COMMAND, START_TRANSCEIVER); 799 DELAY(DELAY_MULTIPLE * 1000); 800 } 801 break; 802 case ACF_CONNECTOR_AUI: 803 /* nothing to do */ 804 break; 805 default: 806 printf("ep%d: strange connector type in EEPROM: assuming AUI\n", 807 sc->unit); 808 break; 809 } 810 811 outw(BASE + EP_COMMAND, RX_ENABLE); 812 outw(BASE + EP_COMMAND, TX_ENABLE); 813 814 ifp->if_flags |= IFF_RUNNING; 815 ifp->if_flags &= ~IFF_OACTIVE; /* just in case */ 816 817#ifdef EP_LOCAL_STATS 818 sc->rx_no_first = sc->rx_no_mbuf = 819 sc->rx_bpf_disc = sc->rx_overrunf = sc->rx_overrunl = 820 sc->tx_underrun = 0; 821#endif 822 ep_fset(F_RX_FIRST); 823 if (sc->top) { 824 m_freem(sc->top); 825 sc->top = sc->mcur = 0; 826 } 827 outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_INIT_EARLY_THRESH); 828 outw(BASE + EP_COMMAND, SET_TX_START_THRESH | 16); 829 830 /* 831 * Store up a bunch of mbuf's for use later. (MAX_MBS). First we free up 832 * any that we had in case we're being called from intr or somewhere 833 * else. 834 */ 835 836 GO_WINDOW(1); 837 epstart(ifp); 838 839 splx(s); 840} 841 842static const char padmap[] = {0, 3, 2, 1}; 843 844static void 845epstart(ifp) 846 struct ifnet *ifp; 847{ 848 register struct ep_softc *sc = ifp->if_softc; 849 register u_int len; 850 register struct mbuf *m; 851 struct mbuf *top; 852 int s, pad; 853 854 if (sc->gone) { 855 return; 856 } 857 858 s = splimp(); 859 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 860 if (ifp->if_flags & IFF_OACTIVE) { 861 splx(s); 862 return; 863 } 864startagain: 865 /* Sneak a peek at the next packet */ 866 m = ifp->if_snd.ifq_head; 867 if (m == 0) { 868 splx(s); 869 return; 870 } 871 for (len = 0, top = m; m; m = m->m_next) 872 len += m->m_len; 873 874 pad = padmap[len & 3]; 875 876 /* 877 * The 3c509 automatically pads short packets to minimum ethernet length, 878 * but we drop packets that are too large. Perhaps we should truncate 879 * them instead? 880 */ 881 if (len + pad > ETHER_MAX_LEN) { 882 /* packet is obviously too large: toss it */ 883 ++ifp->if_oerrors; 884 IF_DEQUEUE(&ifp->if_snd, m); 885 m_freem(m); 886 goto readcheck; 887 } 888 if (inw(BASE + EP_W1_FREE_TX) < len + pad + 4) { 889 /* no room in FIFO */ 890 outw(BASE + EP_COMMAND, SET_TX_AVAIL_THRESH | (len + pad + 4)); 891 /* make sure */ 892 if (inw(BASE + EP_W1_FREE_TX) < len + pad + 4) { 893 ifp->if_flags |= IFF_OACTIVE; 894 splx(s); 895 return; 896 } 897 } 898 IF_DEQUEUE(&ifp->if_snd, m); 899 900 outw(BASE + EP_W1_TX_PIO_WR_1, len); 901 outw(BASE + EP_W1_TX_PIO_WR_1, 0x0); /* Second dword meaningless */ 902 903 for (top = m; m != 0; m = m->m_next) 904 if (ep_ftst(F_ACCESS_32_BITS)) { 905 outsl(BASE + EP_W1_TX_PIO_WR_1, mtod(m, caddr_t), 906 m->m_len / 4); 907 if (m->m_len & 3) 908 outsb(BASE + EP_W1_TX_PIO_WR_1, 909 mtod(m, caddr_t) + (m->m_len & (~3)), 910 m->m_len & 3); 911 } else { 912 outsw(BASE + EP_W1_TX_PIO_WR_1, mtod(m, caddr_t), m->m_len / 2); 913 if (m->m_len & 1) 914 outb(BASE + EP_W1_TX_PIO_WR_1, 915 *(mtod(m, caddr_t) + m->m_len - 1)); 916 } 917 918 while (pad--) 919 outb(BASE + EP_W1_TX_PIO_WR_1, 0); /* Padding */ 920 921 if (ifp->if_bpf) { 922 bpf_mtap(ifp, top); 923 } 924 925 ifp->if_timer = 2; 926 ifp->if_opackets++; 927 m_freem(top); 928 929 /* 930 * Is another packet coming in? We don't want to overflow the tiny RX 931 * fifo. 932 */ 933readcheck: 934 if (inw(BASE + EP_W1_RX_STATUS) & RX_BYTES_MASK) { 935 /* 936 * we check if we have packets left, in that case we prepare to come 937 * back later 938 */ 939 if (ifp->if_snd.ifq_head) { 940 outw(BASE + EP_COMMAND, SET_TX_AVAIL_THRESH | 8); 941 } 942 splx(s); 943 return; 944 } 945 goto startagain; 946} 947 948static void 949epintr(unit) 950 int unit; 951{ 952 register struct ep_softc *sc = ep_softc[unit]; 953 954 if (sc->gone) { 955 return; 956 } 957 958 ep_intr(sc); 959} 960 961void 962ep_intr(arg) 963 void *arg; 964{ 965 struct ep_softc *sc; 966 register int status; 967 struct ifnet *ifp; 968 int x; 969 970 x = splbio(); 971 972 sc = (struct ep_softc *)arg; 973 974 ifp = &sc->arpcom.ac_if; 975 976 outw(BASE + EP_COMMAND, SET_INTR_MASK); /* disable all Ints */ 977 978rescan: 979 980 while ((status = inw(BASE + EP_STATUS)) & S_5_INTS) { 981 982 /* first acknowledge all interrupt sources */ 983 outw(BASE + EP_COMMAND, ACK_INTR | (status & S_MASK)); 984 985 if (status & (S_RX_COMPLETE | S_RX_EARLY)) { 986 epread(sc); 987 continue; 988 } 989 if (status & S_TX_AVAIL) { 990 /* we need ACK */ 991 ifp->if_timer = 0; 992 ifp->if_flags &= ~IFF_OACTIVE; 993 GO_WINDOW(1); 994 inw(BASE + EP_W1_FREE_TX); 995 epstart(ifp); 996 } 997 if (status & S_CARD_FAILURE) { 998 ifp->if_timer = 0; 999#ifdef EP_LOCAL_STATS 1000 printf("\nep%d:\n\tStatus: %x\n", sc->unit, status); 1001 GO_WINDOW(4); 1002 printf("\tFIFO Diagnostic: %x\n", inw(BASE + EP_W4_FIFO_DIAG)); 1003 printf("\tStat: %x\n", sc->stat); 1004 printf("\tIpackets=%d, Opackets=%d\n", 1005 ifp->if_ipackets, ifp->if_opackets); 1006 printf("\tNOF=%d, NOMB=%d, BPFD=%d, RXOF=%d, RXOL=%d, TXU=%d\n", 1007 sc->rx_no_first, sc->rx_no_mbuf, sc->rx_bpf_disc, sc->rx_overrunf, 1008 sc->rx_overrunl, sc->tx_underrun); 1009#else 1010 1011#ifdef DIAGNOSTIC 1012 printf("ep%d: Status: %x (input buffer overflow)\n", sc->unit, status); 1013#else 1014 ++ifp->if_ierrors; 1015#endif 1016 1017#endif 1018 epinit(sc); 1019 splx(x); 1020 return; 1021 } 1022 if (status & S_TX_COMPLETE) { 1023 ifp->if_timer = 0; 1024 /* we need ACK. we do it at the end */ 1025 /* 1026 * We need to read TX_STATUS until we get a 0 status in order to 1027 * turn off the interrupt flag. 1028 */ 1029 while ((status = inb(BASE + EP_W1_TX_STATUS)) & TXS_COMPLETE) { 1030 if (status & TXS_SUCCES_INTR_REQ); 1031 else if (status & (TXS_UNDERRUN | TXS_JABBER | TXS_MAX_COLLISION)) { 1032 outw(BASE + EP_COMMAND, TX_RESET); 1033 if (status & TXS_UNDERRUN) { 1034#ifdef EP_LOCAL_STATS 1035 sc->tx_underrun++; 1036#endif 1037 } else { 1038 if (status & TXS_JABBER); 1039 else /* TXS_MAX_COLLISION - we shouldn't get here */ 1040 ++ifp->if_collisions; 1041 } 1042 ++ifp->if_oerrors; 1043 outw(BASE + EP_COMMAND, TX_ENABLE); 1044 /* 1045 * To have a tx_avail_int but giving the chance to the 1046 * Reception 1047 */ 1048 if (ifp->if_snd.ifq_head) { 1049 outw(BASE + EP_COMMAND, SET_TX_AVAIL_THRESH | 8); 1050 } 1051 } 1052 outb(BASE + EP_W1_TX_STATUS, 0x0); /* pops up the next 1053 * status */ 1054 } /* while */ 1055 ifp->if_flags &= ~IFF_OACTIVE; 1056 GO_WINDOW(1); 1057 inw(BASE + EP_W1_FREE_TX); 1058 epstart(ifp); 1059 } /* end TX_COMPLETE */ 1060 } 1061 1062 outw(BASE + EP_COMMAND, C_INTR_LATCH); /* ACK int Latch */ 1063 1064 if ((status = inw(BASE + EP_STATUS)) & S_5_INTS) 1065 goto rescan; 1066 1067 /* re-enable Ints */ 1068 outw(BASE + EP_COMMAND, SET_INTR_MASK | S_5_INTS); 1069 1070 splx(x); 1071} 1072 1073static void 1074epread(sc) 1075 register struct ep_softc *sc; 1076{ 1077 struct ether_header *eh; 1078 struct mbuf *top, *mcur, *m; 1079 struct ifnet *ifp; 1080 int lenthisone; 1081 1082 short rx_fifo2, status; 1083 register short rx_fifo; 1084 1085 ifp = &sc->arpcom.ac_if; 1086 status = inw(BASE + EP_W1_RX_STATUS); 1087 1088read_again: 1089 1090 if (status & ERR_RX) { 1091 ++ifp->if_ierrors; 1092 if (status & ERR_RX_OVERRUN) { 1093 /* 1094 * we can think the rx latency is actually greather than we 1095 * expect 1096 */ 1097#ifdef EP_LOCAL_STATS 1098 if (ep_ftst(F_RX_FIRST)) 1099 sc->rx_overrunf++; 1100 else 1101 sc->rx_overrunl++; 1102#endif 1103 } 1104 goto out; 1105 } 1106 rx_fifo = rx_fifo2 = status & RX_BYTES_MASK; 1107 1108 if (ep_ftst(F_RX_FIRST)) { 1109 MGETHDR(m, M_DONTWAIT, MT_DATA); 1110 if (!m) 1111 goto out; 1112 if (rx_fifo >= MINCLSIZE) 1113 MCLGET(m, M_DONTWAIT); 1114 sc->top = sc->mcur = top = m; 1115#define EROUND ((sizeof(struct ether_header) + 3) & ~3) 1116#define EOFF (EROUND - sizeof(struct ether_header)) 1117 top->m_data += EOFF; 1118 1119 /* Read what should be the header. */ 1120 insw(BASE + EP_W1_RX_PIO_RD_1, 1121 mtod(top, caddr_t), sizeof(struct ether_header) / 2); 1122 top->m_len = sizeof(struct ether_header); 1123 rx_fifo -= sizeof(struct ether_header); 1124 sc->cur_len = rx_fifo2; 1125 } else { 1126 /* come here if we didn't have a complete packet last time */ 1127 top = sc->top; 1128 m = sc->mcur; 1129 sc->cur_len += rx_fifo2; 1130 } 1131 1132 /* Reads what is left in the RX FIFO */ 1133 while (rx_fifo > 0) { 1134 lenthisone = min(rx_fifo, M_TRAILINGSPACE(m)); 1135 if (lenthisone == 0) { /* no room in this one */ 1136 mcur = m; 1137 MGET(m, M_DONTWAIT, MT_DATA); 1138 if (!m) 1139 goto out; 1140 if (rx_fifo >= MINCLSIZE) 1141 MCLGET(m, M_DONTWAIT); 1142 m->m_len = 0; 1143 mcur->m_next = m; 1144 lenthisone = min(rx_fifo, M_TRAILINGSPACE(m)); 1145 } 1146 if (ep_ftst(F_ACCESS_32_BITS)) { /* default for EISA configured cards*/ 1147 insl(BASE + EP_W1_RX_PIO_RD_1, mtod(m, caddr_t) + m->m_len, 1148 lenthisone / 4); 1149 m->m_len += (lenthisone & ~3); 1150 if (lenthisone & 3) 1151 insb(BASE + EP_W1_RX_PIO_RD_1, 1152 mtod(m, caddr_t) + m->m_len, 1153 lenthisone & 3); 1154 m->m_len += (lenthisone & 3); 1155 } else { 1156 insw(BASE + EP_W1_RX_PIO_RD_1, mtod(m, caddr_t) + m->m_len, 1157 lenthisone / 2); 1158 m->m_len += lenthisone; 1159 if (lenthisone & 1) 1160 *(mtod(m, caddr_t) + m->m_len - 1) = inb(BASE + EP_W1_RX_PIO_RD_1); 1161 } 1162 rx_fifo -= lenthisone; 1163 } 1164 1165 if (status & ERR_RX_INCOMPLETE) { /* we haven't received the complete 1166 * packet */ 1167 sc->mcur = m; 1168#ifdef EP_LOCAL_STATS 1169 sc->rx_no_first++; /* to know how often we come here */ 1170#endif 1171 ep_frst(F_RX_FIRST); 1172 if (!((status = inw(BASE + EP_W1_RX_STATUS)) & ERR_RX_INCOMPLETE)) { 1173 /* we see if by now, the packet has completly arrived */ 1174 goto read_again; 1175 } 1176 outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_NEXT_EARLY_THRESH); 1177 return; 1178 } 1179 outw(BASE + EP_COMMAND, RX_DISCARD_TOP_PACK); 1180 ++ifp->if_ipackets; 1181 ep_fset(F_RX_FIRST); 1182 top->m_pkthdr.rcvif = &sc->arpcom.ac_if; 1183 top->m_pkthdr.len = sc->cur_len; 1184 1185 if (ifp->if_bpf) { 1186 bpf_mtap(ifp, top); 1187 1188 /* 1189 * Note that the interface cannot be in promiscuous mode if there are 1190 * no BPF listeners. And if we are in promiscuous mode, we have to 1191 * check if this packet is really ours. 1192 */ 1193 eh = mtod(top, struct ether_header *); 1194 if ((ifp->if_flags & IFF_PROMISC) && 1195 (eh->ether_dhost[0] & 1) == 0 && 1196 bcmp(eh->ether_dhost, sc->arpcom.ac_enaddr, 1197 sizeof(eh->ether_dhost)) != 0 && 1198 bcmp(eh->ether_dhost, etherbroadcastaddr, 1199 sizeof(eh->ether_dhost)) != 0) { 1200 if (sc->top) { 1201 m_freem(sc->top); 1202 sc->top = 0; 1203 } 1204 ep_fset(F_RX_FIRST); 1205#ifdef EP_LOCAL_STATS 1206 sc->rx_bpf_disc++; 1207#endif 1208 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 1209 outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_INIT_EARLY_THRESH); 1210 return; 1211 } 1212 } 1213 1214 eh = mtod(top, struct ether_header *); 1215 m_adj(top, sizeof(struct ether_header)); 1216 ether_input(ifp, eh, top); 1217 sc->top = 0; 1218 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 1219 outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_INIT_EARLY_THRESH); 1220 return; 1221 1222out: 1223 outw(BASE + EP_COMMAND, RX_DISCARD_TOP_PACK); 1224 if (sc->top) { 1225 m_freem(sc->top); 1226 sc->top = 0; 1227#ifdef EP_LOCAL_STATS 1228 sc->rx_no_mbuf++; 1229#endif 1230 } 1231 ep_fset(F_RX_FIRST); 1232 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 1233 outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_INIT_EARLY_THRESH); 1234} 1235 1236/* 1237 * Look familiar? 1238 */ 1239static int 1240epioctl(ifp, cmd, data) 1241 register struct ifnet *ifp; 1242 u_long cmd; 1243 caddr_t data; 1244{ 1245 struct ep_softc *sc = ifp->if_softc; 1246 int s, error = 0; 1247 1248 s = splimp(); 1249 1250 switch (cmd) { 1251 case SIOCSIFADDR: 1252 case SIOCGIFADDR: 1253 case SIOCSIFMTU: 1254 error = ether_ioctl(ifp, cmd, data); 1255 break; 1256 1257 case SIOCSIFFLAGS: 1258 1259 if ((ifp->if_flags & IFF_UP) == 0 && ifp->if_flags & IFF_RUNNING) { 1260 ifp->if_flags &= ~IFF_RUNNING; 1261 epstop(sc); 1262 break; 1263 } else { 1264 /* reinitialize card on any parameter change */ 1265 epinit(sc); 1266 break; 1267 } 1268 1269 /* NOTREACHED */ 1270 break; 1271#ifdef notdef 1272 case SIOCGHWADDR: 1273 bcopy((caddr_t) sc->sc_addr, (caddr_t) & ifr->ifr_data, 1274 sizeof(sc->sc_addr)); 1275 break; 1276#endif 1277 case SIOCADDMULTI: 1278 case SIOCDELMULTI: 1279 /* 1280 * The Etherlink III has no programmable multicast 1281 * filter. We always initialize the card to be 1282 * promiscuous to multicast, since we're always a 1283 * member of the ALL-SYSTEMS group, so there's no 1284 * need to process SIOC*MULTI requests. 1285 */ 1286 error = 0; 1287 break; 1288 default: 1289 error = EINVAL; 1290 } 1291 1292 splx(s); 1293 1294 return (error); 1295} 1296 1297static void 1298epwatchdog(ifp) 1299 struct ifnet *ifp; 1300{ 1301 struct ep_softc *sc = ifp->if_softc; 1302 1303 /* 1304 printf("ep: watchdog\n"); 1305 1306 log(LOG_ERR, "ep%d: watchdog\n", ifp->if_unit); 1307 ifp->if_oerrors++; 1308 */ 1309 1310 if (sc->gone) { 1311 return; 1312 } 1313 1314 ifp->if_flags &= ~IFF_OACTIVE; 1315 epstart(ifp); 1316 ep_intr(ifp->if_softc); 1317} 1318 1319static void 1320epstop(sc) 1321 struct ep_softc *sc; 1322{ 1323 if (sc->gone) { 1324 return; 1325 } 1326 1327 outw(BASE + EP_COMMAND, RX_DISABLE); 1328 outw(BASE + EP_COMMAND, RX_DISCARD_TOP_PACK); 1329 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 1330 outw(BASE + EP_COMMAND, TX_DISABLE); 1331 outw(BASE + EP_COMMAND, STOP_TRANSCEIVER); 1332 outw(BASE + EP_COMMAND, RX_RESET); 1333 outw(BASE + EP_COMMAND, TX_RESET); 1334 while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS); 1335 outw(BASE + EP_COMMAND, C_INTR_LATCH); 1336 outw(BASE + EP_COMMAND, SET_RD_0_MASK); 1337 outw(BASE + EP_COMMAND, SET_INTR_MASK); 1338 outw(BASE + EP_COMMAND, SET_RX_FILTER); 1339} 1340 1341 1342#if 0 1343static int 1344send_ID_sequence(port) 1345 int port; 1346{ 1347 int cx, al; 1348 1349 for (al = 0xff, cx = 0; cx < 255; cx++) { 1350 outb(port, al); 1351 al <<= 1; 1352 if (al & 0x100) 1353 al ^= 0xcf; 1354 } 1355 return (1); 1356} 1357#endif 1358 1359 1360/* 1361 * We get eeprom data from the id_port given an offset into the eeprom. 1362 * Basically; after the ID_sequence is sent to all of the cards; they enter 1363 * the ID_CMD state where they will accept command requests. 0x80-0xbf loads 1364 * the eeprom data. We then read the port 16 times and with every read; the 1365 * cards check for contention (ie: if one card writes a 0 bit and another 1366 * writes a 1 bit then the host sees a 0. At the end of the cycle; each card 1367 * compares the data on the bus; if there is a difference then that card goes 1368 * into ID_WAIT state again). In the meantime; one bit of data is returned in 1369 * the AX register which is conveniently returned to us by inb(). Hence; we 1370 * read 16 times getting one bit of data with each read. 1371 */ 1372 1373static int 1374get_eeprom_data(id_port, offset) 1375 int id_port; 1376 int offset; 1377{ 1378 int i, data = 0; 1379 outb(id_port, 0x80 + offset); 1380 for (i = 0; i < 16; i++) { 1381 DELAY(BIT_DELAY_MULTIPLE * 1000); 1382 data = (data << 1) | (inw(id_port) & 1); 1383 } 1384 return (data); 1385} 1386 1387#endif /* NEP > 0 */ 1388