elink.c revision 1.4 
1/*	$NetBSD: elink.c,v 1.4 1995/01/03 05:04:04 hpeyerl Exp $	*/
2
3/*
4 * Copyright (c) 1994 Charles Hannum.  All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 *    must display the following acknowledgement:
16 *	This product includes software developed by Charles Hannum.
17 * 4. The name of the author may not be used to endorse or promote products
18 *    derived from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * Common code for dealing with 3COM ethernet cards.
34 */
35
36#include <sys/types.h>
37#include <machine/pio.h>
38#include <i386/isa/elink.h>
39
40/*
41 * Issue a `global reset' to all cards.  We have to be careful to do this only
42 * once during autoconfig, to prevent resetting boards that have already been
43 * configured.
44 */
45void
46elink_reset()
47{
48	static int x = 0;
49
50	if (x == 0) {
51		x = 1;
52		outb(ELINK_ID_PORT, ELINK_RESET);
53	}
54}
55
56/*
57 * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
58 * bits are shifted in.  Different board types use different polynomials.
59 */
60void
61elink_idseq(p)
62	register u_char p;
63{
64	register int i;
65	register u_char c;
66
67	outb(ELINK_ID_PORT, 0x0);
68	outb(ELINK_ID_PORT, 0x0);
69
70	c = 0xff;
71	for (i = 255; i; i--) {
72		outb(ELINK_ID_PORT, c);
73		if (c & 0x80) {
74			c <<= 1;
75			c ^= p;
76		} else
77			c <<= 1;
78	}
79}
80