1 /*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1994, 1995 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 * $NetBSD: elink.c,v 1.6 1995/01/07 21:37:54 mycroft Exp $
32 */
33
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36
37 /*
38 * Common code for dealing with 3COM ethernet cards.
39 */
40
41 #include <sys/param.h>
42 #include <sys/systm.h>
43 #include <sys/kernel.h>
44 #include <sys/module.h>
45
46 #include <machine/cpufunc.h>
47
48 #include <dev/ep/elink.h>
49
50 /*
51 * Issue a `global reset' to all cards, and reset the ID state machines. We
52 * have to be careful to do the global reset only once during autoconfig, to
53 * prevent resetting boards that have already been configured.
54 */
55 void
elink_reset()56 elink_reset()
57 {
58 static int x = 0;
59
60 if (x == 0) {
61 x = 1;
62 outb(ELINK_ID_PORT, ELINK_RESET);
63 }
64 outb(ELINK_ID_PORT, 0x00);
65 outb(ELINK_ID_PORT, 0x00);
66
67 return;
68 }
69
70 /*
71 * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
72 * bits are shifted in. Different board types use different polynomials.
73 */
74 void
elink_idseq(u_char p)75 elink_idseq(u_char p)
76 {
77 int i;
78 u_char c;
79
80 c = 0xff;
81 for (i = 255; i; i--) {
82 outb(ELINK_ID_PORT, c);
83 if (c & 0x80) {
84 c <<= 1;
85 c ^= p;
86 } else
87 c <<= 1;
88 }
89 }
90
91 static moduledata_t elink_mod = {
92 "elink",/* module name */
93 NULL, /* event handler */
94 0 /* extra data */
95 };
96
97 DECLARE_MODULE(elink, elink_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
98 MODULE_VERSION(elink, 1);
99