if_ep.c revision 37101 
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 *  $Id: if_ep.c,v 1.75 1998/06/07 17:10:28 dfr Exp $
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 "bpfilter.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/if.h>
80
81#ifdef INET
82#include <netinet/in.h>
83#include <netinet/if_ether.h>
84#endif
85
86#ifdef IPX
87#include <netipx/ipx.h>
88#include <netipx/ipx_if.h>
89#endif
90
91#ifdef NS
92#include <netns/ns.h>
93#include <netns/ns_if.h>
94#endif
95
96#if NBPFILTER > 0
97#include <net/bpf.h>
98#endif
99
100#if defined(__FreeBSD__)
101#include <machine/clock.h>
102#endif
103
104#include <i386/isa/isa_device.h>
105#include <i386/isa/if_epreg.h>
106#include <i386/isa/elink.h>
107
108/* Exported variables */
109u_long	ep_unit;
110int	ep_boards;
111struct	ep_board ep_board[EP_MAX_BOARDS + 1];
112
113static	int eeprom_rdy __P((struct ep_softc *sc));
114
115static	int ep_isa_probe __P((struct isa_device *));
116static struct ep_board * ep_look_for_board_at __P((struct isa_device *is));
117static	int ep_isa_attach __P((struct isa_device *));
118static	int epioctl __P((struct ifnet * ifp, u_long, caddr_t));
119
120static	void epinit __P((struct ep_softc *));
121static	void epread __P((struct ep_softc *));
122void	epreset __P((int));
123static	void epstart __P((struct ifnet *));
124static	void epstop __P((struct ep_softc *));
125static	void epwatchdog __P((struct ifnet *));
126
127#if 0
128static	int send_ID_sequence __P((int));
129#endif
130static	int get_eeprom_data __P((int, int));
131
132static	struct ep_softc* ep_softc[NEP];
133static	int ep_current_tag = EP_LAST_TAG + 1;
134static	char *ep_conn_type[] = {"UTP", "AUI", "???", "BNC"};
135
136#define ep_ftst(f) (sc->stat&(f))
137#define ep_fset(f) (sc->stat|=(f))
138#define ep_frst(f) (sc->stat&=~(f))
139
140struct isa_driver epdriver = {
141    ep_isa_probe,
142    ep_isa_attach,
143    "ep",
144    0
145};
146
147#include "card.h"
148
149#if NCARD > 0
150#include <sys/select.h>
151#include <pccard/cardinfo.h>
152#include <pccard/slot.h>
153
154/*
155 * PC-Card (PCMCIA) specific code.
156 */
157static int ep_pccard_init __P((struct pccard_devinfo *));
158static int ep_pccard_attach  __P((struct pccard_devinfo *));
159static void ep_unload __P((struct pccard_devinfo *));
160static int card_intr __P((struct pccard_devinfo *));
161
162static struct pccard_device ep_info = {
163    "ep",
164    ep_pccard_init,
165    ep_unload,
166    card_intr,
167    0,                      /* Attributes - presently unused */
168    &net_imask
169};
170
171DATA_SET(pccarddrv_set, ep_info);
172
173/*
174 * Initialize the device - called from Slot manager.
175 */
176static int
177ep_pccard_init(devi)
178    struct pccard_devinfo *devi;
179{
180    struct isa_device *is = &devi->isahd;
181    struct ep_softc *sc = ep_softc[is->id_unit];
182    struct ep_board *epb;
183    int i;
184
185    epb = &ep_board[is->id_unit];
186
187    if (sc == 0) {
188	if ((sc = ep_alloc(is->id_unit, epb)) == 0) {
189	    return (ENXIO);
190	}
191	ep_unit++;
192    }
193
194    /* get_e() requires these. */
195    sc->ep_io_addr = is->id_iobase;
196    sc->unit = is->id_unit;
197
198    epb->epb_addr = is->id_iobase;
199    epb->epb_used = 1;
200    epb->prod_id = get_e(sc, EEPROM_PROD_ID);
201
202    /* 3C589's product id? */
203    if (epb->prod_id != 0x9058) {
204	printf("ep%d: failed to come ready.\n", is->id_unit);
205	return (ENXIO);
206    }
207
208    epb->res_cfg = get_e(sc, EEPROM_RESOURCE_CFG);
209    for (i = 0; i < 3; i++)
210	sc->epb->eth_addr[i] = get_e(sc, EEPROM_NODE_ADDR_0 + i);
211
212    if (ep_pccard_attach(devi) == 0)
213	return (ENXIO);
214
215    sc->arpcom.ac_if.if_snd.ifq_maxlen = ifqmaxlen;
216    return (0);
217}
218
219static int
220ep_pccard_attach(devi)
221    struct pccard_devinfo *devi;
222{
223    struct isa_device *is = &devi->isahd;
224    struct ep_softc *sc = ep_softc[is->id_unit];
225    u_short config;
226
227    sc->ep_connectors = 0;
228    config = inw(IS_BASE + EP_W0_CONFIG_CTRL);
229    if (config & IS_BNC) {
230	sc->ep_connectors |= BNC;
231    }
232    if (config & IS_UTP) {
233	sc->ep_connectors |= UTP;
234    }
235    if (!(sc->ep_connectors & 7))
236	printf("no connectors!");
237    sc->ep_connector = inw(BASE + EP_W0_ADDRESS_CFG) >> ACF_CONNECTOR_BITS;
238
239    /* ROM size = 0, ROM base = 0 */
240    /* For now, ignore AUTO SELECT feature of 3C589B and later. */
241    outw(BASE + EP_W0_ADDRESS_CFG, get_e(sc, EEPROM_ADDR_CFG) & 0xc000);
242
243    /* Fake IRQ must be 3 */
244    outw(BASE + EP_W0_RESOURCE_CFG, (sc->epb->res_cfg & 0x0fff) | 0x3000);
245
246    outw(BASE + EP_W0_PRODUCT_ID, sc->epb->prod_id);
247
248    ep_attach(sc);
249
250    return 1;
251}
252
253static void
254ep_unload(devi)
255    struct pccard_devinfo *devi;
256{
257    struct ep_softc *sc = ep_softc[devi->isahd.id_unit];
258
259    if (sc->gone) {
260        printf("ep%d: already unloaded\n", devi->isahd.id_unit);
261	return;
262    }
263    sc->arpcom.ac_if.if_flags &= ~IFF_RUNNING;
264    sc->gone = 1;
265    printf("ep%d: unload\n", devi->isahd.id_unit);
266}
267
268/*
269 * card_intr - Shared interrupt called from
270 * front end of PC-Card handler.
271 */
272static int
273card_intr(devi)
274    struct pccard_devinfo *devi;
275{
276    epintr(devi->isahd.id_unit);
277    return(1);
278}
279#endif /* NCARD > 0 */
280
281static int
282eeprom_rdy(sc)
283    struct ep_softc *sc;
284{
285    int i;
286
287    for (i = 0; is_eeprom_busy(BASE) && i < MAX_EEPROMBUSY; i++)
288	continue;
289    if (i >= MAX_EEPROMBUSY) {
290	printf("ep%d: eeprom failed to come ready.\n", sc->unit);
291	return (0);
292    }
293    return (1);
294}
295
296static struct ep_board *
297ep_look_for_board_at(is)
298    struct isa_device *is;
299{
300    int data, i, j, id_port = ELINK_ID_PORT;
301    int count = 0;
302
303    if (ep_current_tag == (EP_LAST_TAG + 1)) {
304	/* Come here just one time */
305
306	ep_current_tag--;
307
308        /* Look for the ISA boards. Init and leave them actived */
309	outb(id_port, 0);
310	outb(id_port, 0);
311
312	elink_idseq(0xCF);
313
314	elink_reset();
315	DELAY(10000);
316	for (i = 0; i < EP_MAX_BOARDS; i++) {
317	    outb(id_port, 0);
318	    outb(id_port, 0);
319	    elink_idseq(0xCF);
320
321	    data = get_eeprom_data(id_port, EEPROM_MFG_ID);
322	    if (data != MFG_ID)
323		break;
324
325	    /* resolve contention using the Ethernet address */
326
327	    for (j = 0; j < 3; j++)
328		 get_eeprom_data(id_port, j);
329
330	    /* and save this address for later use */
331
332	    for (j = 0; j < 3; j++)
333		 ep_board[ep_boards].eth_addr[j] = get_eeprom_data(id_port, j);
334
335	    ep_board[ep_boards].res_cfg =
336		get_eeprom_data(id_port, EEPROM_RESOURCE_CFG);
337
338	    ep_board[ep_boards].prod_id =
339		get_eeprom_data(id_port, EEPROM_PROD_ID);
340
341	    ep_board[ep_boards].epb_used = 0;
342#ifdef PC98
343	    ep_board[ep_boards].epb_addr =
344			(get_eeprom_data(id_port, EEPROM_ADDR_CFG) & 0x1f) * 0x100 + 0x40d0;
345#else
346	    ep_board[ep_boards].epb_addr =
347			(get_eeprom_data(id_port, EEPROM_ADDR_CFG) & 0x1f) * 0x10 + 0x200;
348
349	    if (ep_board[ep_boards].epb_addr > 0x3E0)
350		/* Board in EISA configuration mode */
351		continue;
352#endif /* PC98 */
353
354	    outb(id_port, ep_current_tag);	/* tags board */
355	    outb(id_port, ACTIVATE_ADAPTER_TO_CONFIG);
356	    ep_boards++;
357	    count++;
358	    ep_current_tag--;
359	}
360
361	ep_board[ep_boards].epb_addr = 0;
362	if (count) {
363	    printf("%d 3C5x9 board(s) on ISA found at", count);
364	    for (j = 0; ep_board[j].epb_addr; j++)
365		if (ep_board[j].epb_addr <= 0x3E0)
366		    printf(" 0x%x", ep_board[j].epb_addr);
367	    printf("\n");
368	}
369    }
370
371    /* we have two cases:
372     *
373     *  1. Device was configured with 'port ?'
374     *      In this case we search for the first unused card in list
375     *
376     *  2. Device was configured with 'port xxx'
377     *      In this case we search for the unused card with that address
378     *
379     */
380
381    if (IS_BASE == -1) { /* port? */
382	for (i = 0; ep_board[i].epb_addr && ep_board[i].epb_used; i++)
383	    ;
384	if (ep_board[i].epb_addr == 0)
385	    return 0;
386
387	IS_BASE = ep_board[i].epb_addr;
388	ep_board[i].epb_used = 1;
389
390	return &ep_board[i];
391    } else {
392	for (i = 0;
393	     ep_board[i].epb_addr && ep_board[i].epb_addr != IS_BASE;
394	     i++)
395	    ;
396
397	if (ep_board[i].epb_used || ep_board[i].epb_addr != IS_BASE)
398	    return 0;
399
400	if (inw(IS_BASE + EP_W0_EEPROM_COMMAND) & EEPROM_TST_MODE) {
401	    printf("ep%d: 3c5x9 at 0x%x in PnP mode. Disable PnP mode!\n",
402		   is->id_unit, IS_BASE);
403	}
404	ep_board[i].epb_used = 1;
405
406	return &ep_board[i];
407    }
408}
409
410/*
411 * get_e: gets a 16 bits word from the EEPROM. we must have set the window
412 * before
413 */
414u_int16_t
415get_e(sc, offset)
416    struct ep_softc *sc;
417    int offset;
418{
419    if (!eeprom_rdy(sc))
420	return (0xffff);
421    outw(BASE + EP_W0_EEPROM_COMMAND, EEPROM_CMD_RD | offset);
422    if (!eeprom_rdy(sc))
423	return (0xffff);
424    return (inw(BASE + EP_W0_EEPROM_DATA));
425}
426
427struct ep_softc *
428ep_alloc(unit, epb)
429    int	unit;
430    struct	ep_board *epb;
431{
432    struct	ep_softc *sc;
433
434    if (unit >= NEP) {
435	printf("ep: unit number (%d) too high\n", unit);
436	return NULL;
437    }
438
439    /*
440     * Allocate a storage area for us
441     */
442    if (ep_softc[unit]) {
443	printf("ep%d: unit number already allocated to another "
444	       "adaptor\n", unit);
445	return NULL;
446    }
447
448    sc = malloc(sizeof(struct ep_softc), M_DEVBUF, M_NOWAIT);
449    if (!sc) {
450	printf("ep%d: cannot malloc!\n", unit);
451	return NULL;
452    }
453    bzero(sc, sizeof(struct ep_softc));
454    ep_softc[unit] = sc;
455    sc->unit = unit;
456    sc->ep_io_addr = epb->epb_addr;
457    sc->epb = epb;
458
459    return(sc);
460}
461
462void
463ep_free(sc)
464    struct ep_softc *sc;
465{
466    ep_softc[sc->unit] = NULL;
467    free(sc, M_DEVBUF);
468    return;
469}
470
471int
472ep_isa_probe(is)
473    struct isa_device *is;
474{
475    struct ep_softc *sc;
476    struct ep_board *epb;
477    u_short k;
478
479    if ((epb = ep_look_for_board_at(is)) == 0)
480	return (0);
481
482    /*
483     * Allocate a storage area for us
484     */
485    sc = ep_alloc(ep_unit, epb);
486    if (!sc)
487	return (0);
488
489    is->id_unit = ep_unit++;
490
491    /*
492     * The iobase was found and MFG_ID was 0x6d50. PROD_ID should be
493     * 0x9[0-f]50	(IBM-PC)
494     * 0x9[0-f]5[0-f]	(PC-98)
495     */
496    GO_WINDOW(0);
497    k = sc->epb->prod_id;
498#ifdef PC98
499    if ((k & 0xf0f0) != (PROD_ID & 0xf0f0)) {
500#else
501    if ((k & 0xf0ff) != (PROD_ID & 0xf0ff)) {
502#endif
503	printf("ep_isa_probe: ignoring model %04x\n", k);
504	ep_free(sc);
505	return (0);
506    }
507
508    k = sc->epb->res_cfg;
509
510    k >>= 12;
511
512    /* Now we have two cases again:
513     *
514     *  1. Device was configured with 'irq?'
515     *      In this case we use irq read from the board
516     *
517     *  2. Device was configured with 'irq xxx'
518     *      In this case we set up the board to use specified interrupt
519     *
520     */
521
522    if (is->id_irq == 0) { /* irq? */
523	is->id_irq = 1 << ((k == 2) ? 9 : k);
524    }
525
526    sc->stat = 0;	/* 16 bit access */
527
528    /* By now, the adapter is already activated */
529
530    return (EP_IOSIZE);		/* 16 bytes of I/O space used. */
531}
532
533static int
534ep_isa_attach(is)
535    struct isa_device *is;
536{
537    struct ep_softc *sc = ep_softc[is->id_unit];
538    u_short config;
539    int irq;
540
541    sc->ep_connectors = 0;
542    config = inw(IS_BASE + EP_W0_CONFIG_CTRL);
543    if (config & IS_AUI) {
544	sc->ep_connectors |= AUI;
545    }
546    if (config & IS_BNC) {
547	sc->ep_connectors |= BNC;
548    }
549    if (config & IS_UTP) {
550	sc->ep_connectors |= UTP;
551    }
552    if (!(sc->ep_connectors & 7))
553	printf("no connectors!");
554    sc->ep_connector = inw(BASE + EP_W0_ADDRESS_CFG) >> ACF_CONNECTOR_BITS;
555    /*
556     * Write IRQ value to board
557     */
558
559    irq = ffs(is->id_irq) - 1;
560    if (irq == -1) {
561	printf(" invalid irq... cannot attach\n");
562	return 0;
563    }
564
565    GO_WINDOW(0);
566    SET_IRQ(BASE, irq);
567
568    ep_attach(sc);
569    return 1;
570}
571
572int
573ep_attach(sc)
574    struct ep_softc *sc;
575{
576    struct ifnet *ifp = &sc->arpcom.ac_if;
577    u_short *p;
578    int i;
579    int attached;
580
581    sc->gone = 0;
582    attached = (ifp->if_softc != 0);
583
584    printf("ep%d: ", sc->unit);
585    /*
586     * Current media type
587     */
588    if (sc->ep_connectors & AUI) {
589	printf("aui");
590	if (sc->ep_connectors & ~AUI)
591		printf("/");
592    }
593    if (sc->ep_connectors & UTP) {
594	printf("utp");
595	if (sc->ep_connectors & BNC)
596		printf("/");
597    }
598    if (sc->ep_connectors & BNC) {
599	printf("bnc");
600    }
601
602    printf("[*%s*]", ep_conn_type[sc->ep_connector]);
603
604    /*
605     * Setup the station address
606     */
607    p = (u_short *) & sc->arpcom.ac_enaddr;
608    GO_WINDOW(2);
609    for (i = 0; i < 3; i++) {
610	p[i] = htons(sc->epb->eth_addr[i]);
611	outw(BASE + EP_W2_ADDR_0 + (i * 2), ntohs(p[i]));
612    }
613    printf(" address %6D\n", sc->arpcom.ac_enaddr, ":");
614
615    ifp->if_softc = sc;
616    ifp->if_unit = sc->unit;
617    ifp->if_name = "ep";
618    ifp->if_mtu = ETHERMTU;
619    ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST;
620    ifp->if_output = ether_output;
621    ifp->if_start = epstart;
622    ifp->if_ioctl = epioctl;
623    ifp->if_watchdog = epwatchdog;
624
625    if (!attached) {
626	if_attach(ifp);
627	ether_ifattach(ifp);
628    }
629
630#ifdef EP_LOCAL_STATS
631    sc->rx_no_first = sc->rx_no_mbuf =
632	sc->rx_bpf_disc = sc->rx_overrunf = sc->rx_overrunl =
633	sc->tx_underrun = 0;
634#endif
635    ep_fset(F_RX_FIRST);
636    sc->top = sc->mcur = 0;
637
638#if NBPFILTER > 0
639    if (!attached) {
640	bpfattach(ifp, DLT_EN10MB, sizeof(struct ether_header));
641    }
642#endif
643    return 0;
644}
645
646
647/*
648 * The order in here seems important. Otherwise we may not receive
649 * interrupts. ?!
650 */
651static void
652epinit(sc)
653    struct ep_softc *sc;
654{
655    register struct ifnet *ifp = &sc->arpcom.ac_if;
656    int s, i, j;
657
658    if (sc->gone)
659	return;
660
661	/*
662    if (ifp->if_addrlist == (struct ifaddr *) 0)
663	return;
664	*/
665
666    s = splimp();
667    while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS);
668
669    GO_WINDOW(0);
670    outw(BASE + EP_COMMAND, STOP_TRANSCEIVER);
671    GO_WINDOW(4);
672    outw(BASE + EP_W4_MEDIA_TYPE, DISABLE_UTP);
673    GO_WINDOW(0);
674
675    /* Disable the card */
676    outw(BASE + EP_W0_CONFIG_CTRL, 0);
677
678    /* Enable the card */
679    outw(BASE + EP_W0_CONFIG_CTRL, ENABLE_DRQ_IRQ);
680
681    GO_WINDOW(2);
682
683    /* Reload the ether_addr. */
684    for (i = 0; i < 6; i++)
685	outb(BASE + EP_W2_ADDR_0 + i, sc->arpcom.ac_enaddr[i]);
686
687    outw(BASE + EP_COMMAND, RX_RESET);
688    outw(BASE + EP_COMMAND, TX_RESET);
689    while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS);
690
691    /* Window 1 is operating window */
692    GO_WINDOW(1);
693    for (i = 0; i < 31; i++)
694	inb(BASE + EP_W1_TX_STATUS);
695
696    /* get rid of stray intr's */
697    outw(BASE + EP_COMMAND, ACK_INTR | 0xff);
698
699    outw(BASE + EP_COMMAND, SET_RD_0_MASK | S_5_INTS);
700
701    outw(BASE + EP_COMMAND, SET_INTR_MASK | S_5_INTS);
702
703    if (ifp->if_flags & IFF_PROMISC)
704	outw(BASE + EP_COMMAND, SET_RX_FILTER | FIL_INDIVIDUAL |
705	 FIL_GROUP | FIL_BRDCST | FIL_ALL);
706    else
707	outw(BASE + EP_COMMAND, SET_RX_FILTER | FIL_INDIVIDUAL |
708	 FIL_GROUP | FIL_BRDCST);
709
710     /*
711      * S.B.
712      *
713      * Now behavior was slightly changed:
714      *
715      * if any of flags link[0-2] is used and its connector is
716      * physically present the following connectors are used:
717      *
718      *   link0 - AUI * highest precedence
719      *   link1 - BNC
720      *   link2 - UTP * lowest precedence
721      *
722      * If none of them is specified then
723      * connector specified in the EEPROM is used
724      * (if present on card or AUI if not).
725      *
726      */
727
728    /* Set the xcvr. */
729    if (ifp->if_flags & IFF_LINK0 && sc->ep_connectors & AUI) {
730	i = ACF_CONNECTOR_AUI;
731    } else if (ifp->if_flags & IFF_LINK1 && sc->ep_connectors & BNC) {
732	i = ACF_CONNECTOR_BNC;
733    } else if (ifp->if_flags & IFF_LINK2 && sc->ep_connectors & UTP) {
734	i = ACF_CONNECTOR_UTP;
735    } else {
736	i = sc->ep_connector;
737    }
738    GO_WINDOW(0);
739    j = inw(BASE + EP_W0_ADDRESS_CFG) & 0x3fff;
740    outw(BASE + EP_W0_ADDRESS_CFG, j | (i << ACF_CONNECTOR_BITS));
741
742    switch(i) {
743      case ACF_CONNECTOR_UTP:
744	if (sc->ep_connectors & UTP) {
745	    GO_WINDOW(4);
746	    outw(BASE + EP_W4_MEDIA_TYPE, ENABLE_UTP);
747	}
748	break;
749      case ACF_CONNECTOR_BNC:
750	if (sc->ep_connectors & BNC) {
751	    outw(BASE + EP_COMMAND, START_TRANSCEIVER);
752	    DELAY(1000);
753	}
754	break;
755      case ACF_CONNECTOR_AUI:
756	/* nothing to do */
757	break;
758      default:
759	printf("ep%d: strange connector type in EEPROM: assuming AUI\n",
760	       sc->unit);
761	break;
762    }
763
764    outw(BASE + EP_COMMAND, RX_ENABLE);
765    outw(BASE + EP_COMMAND, TX_ENABLE);
766
767    ifp->if_flags |= IFF_RUNNING;
768    ifp->if_flags &= ~IFF_OACTIVE;	/* just in case */
769
770#ifdef EP_LOCAL_STATS
771    sc->rx_no_first = sc->rx_no_mbuf =
772	sc->rx_bpf_disc = sc->rx_overrunf = sc->rx_overrunl =
773	sc->tx_underrun = 0;
774#endif
775    ep_fset(F_RX_FIRST);
776    if (sc->top) {
777	m_freem(sc->top);
778	sc->top = sc->mcur = 0;
779    }
780    outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_INIT_EARLY_THRESH);
781    outw(BASE + EP_COMMAND, SET_TX_START_THRESH | 16);
782
783    /*
784     * Store up a bunch of mbuf's for use later. (MAX_MBS). First we free up
785     * any that we had in case we're being called from intr or somewhere
786     * else.
787     */
788
789    GO_WINDOW(1);
790    epstart(ifp);
791
792    splx(s);
793}
794
795static const char padmap[] = {0, 3, 2, 1};
796
797static void
798epstart(ifp)
799    struct ifnet *ifp;
800{
801    register struct ep_softc *sc = ifp->if_softc;
802    register u_int len;
803    register struct mbuf *m;
804    struct mbuf *top;
805    int s, pad;
806
807    if (sc->gone) {
808	return;
809    }
810
811    s = splimp();
812    while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS);
813    if (ifp->if_flags & IFF_OACTIVE) {
814	splx(s);
815	return;
816    }
817startagain:
818    /* Sneak a peek at the next packet */
819    m = ifp->if_snd.ifq_head;
820    if (m == 0) {
821	splx(s);
822	return;
823    }
824    for (len = 0, top = m; m; m = m->m_next)
825	len += m->m_len;
826
827    pad = padmap[len & 3];
828
829    /*
830     * The 3c509 automatically pads short packets to minimum ethernet length,
831     * but we drop packets that are too large. Perhaps we should truncate
832     * them instead?
833     */
834    if (len + pad > ETHER_MAX_LEN) {
835	/* packet is obviously too large: toss it */
836	++ifp->if_oerrors;
837	IF_DEQUEUE(&ifp->if_snd, m);
838	m_freem(m);
839	goto readcheck;
840    }
841    if (inw(BASE + EP_W1_FREE_TX) < len + pad + 4) {
842	/* no room in FIFO */
843	outw(BASE + EP_COMMAND, SET_TX_AVAIL_THRESH | (len + pad + 4));
844	/* make sure */
845	if (inw(BASE + EP_W1_FREE_TX) < len + pad + 4) {
846	    ifp->if_flags |= IFF_OACTIVE;
847	    splx(s);
848	    return;
849	}
850    }
851    IF_DEQUEUE(&ifp->if_snd, m);
852
853    outw(BASE + EP_W1_TX_PIO_WR_1, len);
854    outw(BASE + EP_W1_TX_PIO_WR_1, 0x0);	/* Second dword meaningless */
855
856    for (top = m; m != 0; m = m->m_next)
857	if (ep_ftst(F_ACCESS_32_BITS)) {
858	    outsl(BASE + EP_W1_TX_PIO_WR_1, mtod(m, caddr_t),
859		  m->m_len / 4);
860	    if (m->m_len & 3)
861		outsb(BASE + EP_W1_TX_PIO_WR_1,
862		      mtod(m, caddr_t) + (m->m_len & (~3)),
863		      m->m_len & 3);
864	} else {
865	    outsw(BASE + EP_W1_TX_PIO_WR_1, mtod(m, caddr_t), m->m_len / 2);
866	    if (m->m_len & 1)
867		outb(BASE + EP_W1_TX_PIO_WR_1,
868		     *(mtod(m, caddr_t) + m->m_len - 1));
869	}
870
871    while (pad--)
872	outb(BASE + EP_W1_TX_PIO_WR_1, 0);	/* Padding */
873
874#if NBPFILTER > 0
875    if (ifp->if_bpf) {
876	bpf_mtap(ifp, top);
877    }
878#endif
879
880    ifp->if_timer = 2;
881    ifp->if_opackets++;
882    m_freem(top);
883
884    /*
885     * Is another packet coming in? We don't want to overflow the tiny RX
886     * fifo.
887     */
888readcheck:
889    if (inw(BASE + EP_W1_RX_STATUS) & RX_BYTES_MASK) {
890	/*
891	 * we check if we have packets left, in that case we prepare to come
892	 * back later
893	 */
894	if (ifp->if_snd.ifq_head) {
895	    outw(BASE + EP_COMMAND, SET_TX_AVAIL_THRESH | 8);
896	}
897	splx(s);
898	return;
899    }
900    goto startagain;
901}
902
903void
904epintr(unit)
905    int unit;
906{
907    register struct ep_softc *sc = ep_softc[unit];
908
909    if (sc->gone) {
910	return;
911    }
912
913    ep_intr(sc);
914}
915
916void
917ep_intr(arg)
918    void *arg;
919{
920    struct ep_softc *sc;
921    register int status;
922    struct ifnet *ifp;
923    int x;
924
925    x = splbio();
926
927    sc = (struct ep_softc *)arg;
928
929    ifp = &sc->arpcom.ac_if;
930
931    outw(BASE + EP_COMMAND, SET_INTR_MASK); /* disable all Ints */
932
933rescan:
934
935    while ((status = inw(BASE + EP_STATUS)) & S_5_INTS) {
936
937	/* first acknowledge all interrupt sources */
938	outw(BASE + EP_COMMAND, ACK_INTR | (status & S_MASK));
939
940	if (status & (S_RX_COMPLETE | S_RX_EARLY)) {
941	    epread(sc);
942	    continue;
943	}
944	if (status & S_TX_AVAIL) {
945	    /* we need ACK */
946	    ifp->if_timer = 0;
947	    ifp->if_flags &= ~IFF_OACTIVE;
948	    GO_WINDOW(1);
949	    inw(BASE + EP_W1_FREE_TX);
950	    epstart(ifp);
951	}
952	if (status & S_CARD_FAILURE) {
953	    ifp->if_timer = 0;
954#ifdef EP_LOCAL_STATS
955	    printf("\nep%d:\n\tStatus: %x\n", sc->unit, status);
956	    GO_WINDOW(4);
957	    printf("\tFIFO Diagnostic: %x\n", inw(BASE + EP_W4_FIFO_DIAG));
958	    printf("\tStat: %x\n", sc->stat);
959	    printf("\tIpackets=%d, Opackets=%d\n",
960		ifp->if_ipackets, ifp->if_opackets);
961	    printf("\tNOF=%d, NOMB=%d, BPFD=%d, RXOF=%d, RXOL=%d, TXU=%d\n",
962		   sc->rx_no_first, sc->rx_no_mbuf, sc->rx_bpf_disc, sc->rx_overrunf,
963		   sc->rx_overrunl, sc->tx_underrun);
964#else
965
966#ifdef DIAGNOSTIC
967	    printf("ep%d: Status: %x (input buffer overflow)\n", sc->unit, status);
968#else
969	    ++ifp->if_ierrors;
970#endif
971
972#endif
973	    epinit(sc);
974	    splx(x);
975	    return;
976	}
977	if (status & S_TX_COMPLETE) {
978	    ifp->if_timer = 0;
979	    /* we  need ACK. we do it at the end */
980	    /*
981	     * We need to read TX_STATUS until we get a 0 status in order to
982	     * turn off the interrupt flag.
983	     */
984	    while ((status = inb(BASE + EP_W1_TX_STATUS)) & TXS_COMPLETE) {
985		if (status & TXS_SUCCES_INTR_REQ);
986		else if (status & (TXS_UNDERRUN | TXS_JABBER | TXS_MAX_COLLISION)) {
987		    outw(BASE + EP_COMMAND, TX_RESET);
988		    if (status & TXS_UNDERRUN) {
989#ifdef EP_LOCAL_STATS
990			sc->tx_underrun++;
991#endif
992		    } else {
993			if (status & TXS_JABBER);
994			else	/* TXS_MAX_COLLISION - we shouldn't get here */
995			    ++ifp->if_collisions;
996		    }
997		    ++ifp->if_oerrors;
998		    outw(BASE + EP_COMMAND, TX_ENABLE);
999		    /*
1000		     * To have a tx_avail_int but giving the chance to the
1001		     * Reception
1002		     */
1003		    if (ifp->if_snd.ifq_head) {
1004			outw(BASE + EP_COMMAND, SET_TX_AVAIL_THRESH | 8);
1005		    }
1006		}
1007		outb(BASE + EP_W1_TX_STATUS, 0x0);	/* pops up the next
1008							 * status */
1009	    }			/* while */
1010	    ifp->if_flags &= ~IFF_OACTIVE;
1011	    GO_WINDOW(1);
1012	    inw(BASE + EP_W1_FREE_TX);
1013	    epstart(ifp);
1014	}			/* end TX_COMPLETE */
1015    }
1016
1017    outw(BASE + EP_COMMAND, C_INTR_LATCH);	/* ACK int Latch */
1018
1019    if ((status = inw(BASE + EP_STATUS)) & S_5_INTS)
1020	goto rescan;
1021
1022    /* re-enable Ints */
1023    outw(BASE + EP_COMMAND, SET_INTR_MASK | S_5_INTS);
1024
1025    splx(x);
1026}
1027
1028static void
1029epread(sc)
1030    register struct ep_softc *sc;
1031{
1032    struct ether_header *eh;
1033    struct mbuf *top, *mcur, *m;
1034    struct ifnet *ifp;
1035    int lenthisone;
1036
1037    short rx_fifo2, status;
1038    register short rx_fifo;
1039
1040    ifp = &sc->arpcom.ac_if;
1041    status = inw(BASE + EP_W1_RX_STATUS);
1042
1043read_again:
1044
1045    if (status & ERR_RX) {
1046	++ifp->if_ierrors;
1047	if (status & ERR_RX_OVERRUN) {
1048	    /*
1049	     * we can think the rx latency is actually greather than we
1050	     * expect
1051	     */
1052#ifdef EP_LOCAL_STATS
1053	    if (ep_ftst(F_RX_FIRST))
1054		sc->rx_overrunf++;
1055	    else
1056		sc->rx_overrunl++;
1057#endif
1058	}
1059	goto out;
1060    }
1061    rx_fifo = rx_fifo2 = status & RX_BYTES_MASK;
1062
1063    if (ep_ftst(F_RX_FIRST)) {
1064	MGETHDR(m, M_DONTWAIT, MT_DATA);
1065	if (!m)
1066	    goto out;
1067	if (rx_fifo >= MINCLSIZE)
1068	    MCLGET(m, M_DONTWAIT);
1069	sc->top = sc->mcur = top = m;
1070#define EROUND  ((sizeof(struct ether_header) + 3) & ~3)
1071#define EOFF    (EROUND - sizeof(struct ether_header))
1072	top->m_data += EOFF;
1073
1074	/* Read what should be the header. */
1075	insw(BASE + EP_W1_RX_PIO_RD_1,
1076	     mtod(top, caddr_t), sizeof(struct ether_header) / 2);
1077	top->m_len = sizeof(struct ether_header);
1078	rx_fifo -= sizeof(struct ether_header);
1079	sc->cur_len = rx_fifo2;
1080    } else {
1081	/* come here if we didn't have a complete packet last time */
1082	top = sc->top;
1083	m = sc->mcur;
1084	sc->cur_len += rx_fifo2;
1085    }
1086
1087    /* Reads what is left in the RX FIFO */
1088    while (rx_fifo > 0) {
1089	lenthisone = min(rx_fifo, M_TRAILINGSPACE(m));
1090	if (lenthisone == 0) {	/* no room in this one */
1091	    mcur = m;
1092	    MGET(m, M_DONTWAIT, MT_DATA);
1093	    if (!m)
1094		goto out;
1095	    if (rx_fifo >= MINCLSIZE)
1096		MCLGET(m, M_DONTWAIT);
1097	    m->m_len = 0;
1098	    mcur->m_next = m;
1099	    lenthisone = min(rx_fifo, M_TRAILINGSPACE(m));
1100	}
1101	if (ep_ftst(F_ACCESS_32_BITS)) { /* default for EISA configured cards*/
1102	    insl(BASE + EP_W1_RX_PIO_RD_1, mtod(m, caddr_t) + m->m_len,
1103		 lenthisone / 4);
1104	    m->m_len += (lenthisone & ~3);
1105	    if (lenthisone & 3)
1106		insb(BASE + EP_W1_RX_PIO_RD_1,
1107		     mtod(m, caddr_t) + m->m_len,
1108		     lenthisone & 3);
1109	    m->m_len += (lenthisone & 3);
1110	} else {
1111	    insw(BASE + EP_W1_RX_PIO_RD_1, mtod(m, caddr_t) + m->m_len,
1112		 lenthisone / 2);
1113	    m->m_len += lenthisone;
1114	    if (lenthisone & 1)
1115		*(mtod(m, caddr_t) + m->m_len - 1) = inb(BASE + EP_W1_RX_PIO_RD_1);
1116	}
1117	rx_fifo -= lenthisone;
1118    }
1119
1120    if (status & ERR_RX_INCOMPLETE) {	/* we haven't received the complete
1121					 * packet */
1122	sc->mcur = m;
1123#ifdef EP_LOCAL_STATS
1124	sc->rx_no_first++;	/* to know how often we come here */
1125#endif
1126	ep_frst(F_RX_FIRST);
1127	if (!((status = inw(BASE + EP_W1_RX_STATUS)) & ERR_RX_INCOMPLETE)) {
1128	    /* we see if by now, the packet has completly arrived */
1129	    goto read_again;
1130	}
1131	outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_NEXT_EARLY_THRESH);
1132	return;
1133    }
1134    outw(BASE + EP_COMMAND, RX_DISCARD_TOP_PACK);
1135    ++ifp->if_ipackets;
1136    ep_fset(F_RX_FIRST);
1137    top->m_pkthdr.rcvif = &sc->arpcom.ac_if;
1138    top->m_pkthdr.len = sc->cur_len;
1139
1140#if NBPFILTER > 0
1141    if (ifp->if_bpf) {
1142	bpf_mtap(ifp, top);
1143
1144	/*
1145	 * Note that the interface cannot be in promiscuous mode if there are
1146	 * no BPF listeners.  And if we are in promiscuous mode, we have to
1147	 * check if this packet is really ours.
1148	 */
1149	eh = mtod(top, struct ether_header *);
1150	if ((ifp->if_flags & IFF_PROMISC) &&
1151	    (eh->ether_dhost[0] & 1) == 0 &&
1152	    bcmp(eh->ether_dhost, sc->arpcom.ac_enaddr,
1153		 sizeof(eh->ether_dhost)) != 0 &&
1154	    bcmp(eh->ether_dhost, etherbroadcastaddr,
1155		 sizeof(eh->ether_dhost)) != 0) {
1156	    if (sc->top) {
1157		m_freem(sc->top);
1158		sc->top = 0;
1159	    }
1160	    ep_fset(F_RX_FIRST);
1161#ifdef EP_LOCAL_STATS
1162	    sc->rx_bpf_disc++;
1163#endif
1164	    while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS);
1165	    outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_INIT_EARLY_THRESH);
1166	    return;
1167	}
1168    }
1169#endif
1170
1171    eh = mtod(top, struct ether_header *);
1172    m_adj(top, sizeof(struct ether_header));
1173    ether_input(ifp, eh, top);
1174    sc->top = 0;
1175    while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS);
1176    outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_INIT_EARLY_THRESH);
1177    return;
1178
1179out:
1180    outw(BASE + EP_COMMAND, RX_DISCARD_TOP_PACK);
1181    if (sc->top) {
1182	m_freem(sc->top);
1183	sc->top = 0;
1184#ifdef EP_LOCAL_STATS
1185	sc->rx_no_mbuf++;
1186#endif
1187    }
1188    ep_fset(F_RX_FIRST);
1189    while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS);
1190    outw(BASE + EP_COMMAND, SET_RX_EARLY_THRESH | RX_INIT_EARLY_THRESH);
1191}
1192
1193/*
1194 * Look familiar?
1195 */
1196static int
1197epioctl(ifp, cmd, data)
1198    register struct ifnet *ifp;
1199    u_long cmd;
1200    caddr_t data;
1201{
1202    register struct ifaddr *ifa = (struct ifaddr *) data;
1203    struct ep_softc *sc = ifp->if_softc;
1204    struct ifreq *ifr = (struct ifreq *) data;
1205    int s, error = 0;
1206
1207    s = splimp();
1208
1209    switch (cmd) {
1210      case SIOCSIFADDR:
1211	ifp->if_flags |= IFF_UP;
1212
1213	/* netifs are BUSY when UP */
1214
1215	switch (ifa->ifa_addr->sa_family) {
1216#ifdef INET
1217	  case AF_INET:
1218	    epinit(sc);	/* before arpwhohas */
1219	    arp_ifinit((struct arpcom *)ifp, ifa);
1220	    break;
1221#endif
1222#ifdef IPX
1223	  case AF_IPX:
1224	    {
1225		register struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr);
1226
1227		if (ipx_nullhost(*ina))
1228		    ina->x_host =
1229			*(union ipx_host *) (sc->arpcom.ac_enaddr);
1230		else {
1231		    ifp->if_flags &= ~IFF_RUNNING;
1232		    bcopy((caddr_t) ina->x_host.c_host,
1233			  (caddr_t) sc->arpcom.ac_enaddr,
1234			  sizeof(sc->arpcom.ac_enaddr));
1235		}
1236		epinit(sc);
1237		break;
1238	    }
1239#endif
1240#ifdef NS
1241	  case AF_NS:
1242	    {
1243		register struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr);
1244
1245		if (ns_nullhost(*ina))
1246		    ina->x_host =
1247			*(union ns_host *) (sc->arpcom.ac_enaddr);
1248		else {
1249		    ifp->if_flags &= ~IFF_RUNNING;
1250		    bcopy((caddr_t) ina->x_host.c_host,
1251			  (caddr_t) sc->arpcom.ac_enaddr,
1252			  sizeof(sc->arpcom.ac_enaddr));
1253		}
1254		epinit(sc);
1255		break;
1256	    }
1257#endif
1258	  default:
1259	    epinit(sc);
1260	    break;
1261	}
1262	break;
1263      case SIOCGIFADDR:
1264	{
1265	  struct sockaddr *sa;
1266
1267	  sa = (struct sockaddr *) & ifr->ifr_data;
1268	  bcopy((caddr_t) sc->arpcom.ac_enaddr,
1269		(caddr_t) sa->sa_data, ETHER_ADDR_LEN);
1270	}
1271	break;
1272      case SIOCSIFFLAGS:
1273
1274	if ((ifp->if_flags & IFF_UP) == 0 && ifp->if_flags & IFF_RUNNING) {
1275	    ifp->if_flags &= ~IFF_RUNNING;
1276	    epstop(sc);
1277	    break;
1278	} else {
1279	    /* reinitialize card on any parameter change */
1280	    epinit(sc);
1281	    break;
1282	}
1283
1284	/* NOTREACHED */
1285	break;
1286#ifdef notdef
1287      case SIOCGHWADDR:
1288	bcopy((caddr_t) sc->sc_addr, (caddr_t) & ifr->ifr_data,
1289	      sizeof(sc->sc_addr));
1290	break;
1291#endif
1292	case SIOCSIFMTU:
1293
1294		/*
1295		 * Set the interface MTU.
1296		 */
1297		if (ifr->ifr_mtu > ETHERMTU) {
1298			error = EINVAL;
1299		} else {
1300			ifp->if_mtu = ifr->ifr_mtu;
1301		}
1302		break;
1303	case SIOCADDMULTI:
1304	case SIOCDELMULTI:
1305	    /*
1306	     * The Etherlink III has no programmable multicast
1307	     * filter.  We always initialize the card to be
1308	     * promiscuous to multicast, since we're always a
1309	     * member of the ALL-SYSTEMS group, so there's no
1310	     * need to process SIOC*MULTI requests.
1311	     */
1312	    error = 0;
1313	    break;
1314      default:
1315		error = EINVAL;
1316    }
1317
1318    splx(s);
1319
1320    return (error);
1321}
1322
1323static void
1324epwatchdog(ifp)
1325    struct ifnet *ifp;
1326{
1327    struct ep_softc *sc = ifp->if_softc;
1328
1329    /*
1330    printf("ep: watchdog\n");
1331
1332    log(LOG_ERR, "ep%d: watchdog\n", ifp->if_unit);
1333    ifp->if_oerrors++;
1334    */
1335
1336    if (sc->gone) {
1337	return;
1338    }
1339
1340    ifp->if_flags &= ~IFF_OACTIVE;
1341    epstart(ifp);
1342    ep_intr(ifp->if_softc);
1343}
1344
1345static void
1346epstop(sc)
1347    struct ep_softc *sc;
1348{
1349    if (sc->gone) {
1350	return;
1351    }
1352
1353    outw(BASE + EP_COMMAND, RX_DISABLE);
1354    outw(BASE + EP_COMMAND, RX_DISCARD_TOP_PACK);
1355    while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS);
1356    outw(BASE + EP_COMMAND, TX_DISABLE);
1357    outw(BASE + EP_COMMAND, STOP_TRANSCEIVER);
1358    outw(BASE + EP_COMMAND, RX_RESET);
1359    outw(BASE + EP_COMMAND, TX_RESET);
1360    while (inw(BASE + EP_STATUS) & S_COMMAND_IN_PROGRESS);
1361    outw(BASE + EP_COMMAND, C_INTR_LATCH);
1362    outw(BASE + EP_COMMAND, SET_RD_0_MASK);
1363    outw(BASE + EP_COMMAND, SET_INTR_MASK);
1364    outw(BASE + EP_COMMAND, SET_RX_FILTER);
1365}
1366
1367
1368#if 0
1369static int
1370send_ID_sequence(port)
1371    int port;
1372{
1373    int cx, al;
1374
1375    for (al = 0xff, cx = 0; cx < 255; cx++) {
1376	outb(port, al);
1377	al <<= 1;
1378	if (al & 0x100)
1379	    al ^= 0xcf;
1380    }
1381    return (1);
1382}
1383#endif
1384
1385
1386/*
1387 * We get eeprom data from the id_port given an offset into the eeprom.
1388 * Basically; after the ID_sequence is sent to all of the cards; they enter
1389 * the ID_CMD state where they will accept command requests. 0x80-0xbf loads
1390 * the eeprom data.  We then read the port 16 times and with every read; the
1391 * cards check for contention (ie: if one card writes a 0 bit and another
1392 * writes a 1 bit then the host sees a 0. At the end of the cycle; each card
1393 * compares the data on the bus; if there is a difference then that card goes
1394 * into ID_WAIT state again). In the meantime; one bit of data is returned in
1395 * the AX register which is conveniently returned to us by inb().  Hence; we
1396 * read 16 times getting one bit of data with each read.
1397 */
1398static int
1399get_eeprom_data(id_port, offset)
1400    int id_port;
1401    int offset;
1402{
1403    int i, data = 0;
1404    outb(id_port, 0x80 + offset);
1405    DELAY(1000);
1406    for (i = 0; i < 16; i++)
1407	data = (data << 1) | (inw(id_port) & 1);
1408    return (data);
1409}
1410
1411#endif				/* NEP > 0 */
1412