elink.c revision 2837 
1/*
2 * Copyright (c) 1994 Charles Hannum.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 * 3. All advertising materials mentioning features or use of this software
13 *    must display the following acknowledgement:
14 *	This product includes software developed by Charles Hannum.
15 * 4. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 *	$Id: elink.c,v 1.2 1994/09/16 13:33:35 davidg Exp $
30 */
31
32/*
33 * Common code for dealing with 3COM ethernet cards.
34 */
35
36#include <sys/types.h>
37#include <sys/cdefs.h>
38#include <i386/isa/elink.h>
39#include <i386/include/cpufunc.h>
40
41/*
42 * Issue a `global reset' to all cards.  We have to be careful to do this only
43 * once during autoconfig, to prevent resetting boards that have already been
44 * configured.
45 */
46void
47elink_reset()
48{
49	static int x = 0;
50
51	if (x == 0) {
52		x = 1;
53		outb(ELINK_ID_PORT, ELINK_RESET);
54	}
55}
56
57/*
58 * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
59 * bits are shifted in.  Different board types use different polynomials.
60 */
61void
62elink_idseq(p)
63	register u_char p;
64{
65	register int i;
66	register u_char c;
67
68	c = 0xff;
69	for (i = 255; i; i--) {
70		outb(ELINK_ID_PORT, c);
71		if (c & 0x80) {
72			c <<= 1;
73			c ^= p;
74		} else
75			c <<= 1;
76	}
77}
78