FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/elink.c
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 * $FreeBSD: releng/5.1/sys/i386/isa/elink.c 112789 2003-03-29 13:18:20Z mdodd $
30 */
31
32 /*
33 * Common code for dealing with 3COM ethernet cards.
34 */
35
36 #include <sys/param.h>
37 #include <sys/systm.h>
38 #include <sys/kernel.h>
39 #include <sys/module.h>
40
41 #include <machine/cpufunc.h>
42
43 #include <i386/isa/elink.h>
44
45 /*
46 * Issue a `global reset' to all cards. We have to be careful to do this only
47 * once during autoconfig, to prevent resetting boards that have already been
48 * configured.
49 */
50 void
51 elink_reset()
52 {
53 static int x = 0;
54
55 if (x == 0) {
56 x = 1;
57 outb(ELINK_ID_PORT, ELINK_RESET);
58 }
59 outb(ELINK_ID_PORT, 0);
60 outb(ELINK_ID_PORT, 0);
61
62 return;
63 }
64
65 /*
66 * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
67 * bits are shifted in. Different board types use different polynomials.
68 */
69 void
70 elink_idseq(u_char p)
71 {
72 register int i;
73 register u_char c;
74
75 c = 0xff;
76 for (i = 255; i; i--) {
77 outb(ELINK_ID_PORT, c);
78 if (c & 0x80) {
79 c <<= 1;
80 c ^= p;
81 } else
82 c <<= 1;
83 }
84 }
85
86 static moduledata_t elink_mod = {
87 "elink",/* module name */
88 NULL, /* event handler */
89 0 /* extra data */
90 };
91
92 DECLARE_MODULE(elink, elink_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
93 MODULE_VERSION(elink, 1);
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