elink.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
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#include <sys/cdefs.h>
33__FBSDID("$FreeBSD: stable/11/sys/i386/isa/elink.c 330897 2018-03-14 03:19:51Z eadler $");
34
35/*
36 * Common code for dealing with 3COM ethernet cards.
37 */
38
39#include <sys/param.h>
40#include <sys/systm.h>
41#include <sys/kernel.h>
42#include <sys/module.h>
43
44#include <machine/cpufunc.h>
45
46#include <i386/isa/elink.h>
47
48/*
49 * Issue a `global reset' to all cards.  We have to be careful to do this only
50 * once during autoconfig, to prevent resetting boards that have already been
51 * configured.
52 */
53void
54elink_reset()
55{
56	static int x = 0;
57
58	if (x == 0) {
59		x = 1;
60		outb(ELINK_ID_PORT, ELINK_RESET);
61	}
62	outb(ELINK_ID_PORT, 0);
63	outb(ELINK_ID_PORT, 0);
64
65	return;
66}
67
68/*
69 * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
70 * bits are shifted in.  Different board types use different polynomials.
71 */
72void
73elink_idseq(u_char p)
74{
75	register int i;
76	register u_char c;
77
78	c = 0xff;
79	for (i = 255; i; i--) {
80		outb(ELINK_ID_PORT, c);
81		if (c & 0x80) {
82			c <<= 1;
83			c ^= p;
84		} else
85			c <<= 1;
86	}
87}
88
89static moduledata_t elink_mod = {
90	"elink",/* module name */
91	NULL,	/* event handler */
92	0	/* extra data */
93};
94
95DECLARE_MODULE(elink, elink_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
96MODULE_VERSION(elink, 1);
97