79 lines
2.6 KiB
C
79 lines
2.6 KiB
C
/* $NetBSD: elink.c,v 1.6 1995/01/07 21:37:54 mycroft Exp $ */
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/*
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* Copyright (c) 1994, 1995 Charles Hannum. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Charles Hannum.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Common code for dealing with 3COM ethernet cards.
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*/
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#include <sys/types.h>
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#include <machine/pio.h>
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#include <i386/isa/elink.h>
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/*
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* Issue a `global reset' to all cards, and reset the ID state machines. We
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* have to be careful to do the global reset only once during autoconfig, to
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* prevent resetting boards that have already been configured.
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*/
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void
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elink_reset()
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{
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static int x = 0;
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if (x == 0) {
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x = 1;
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outb(ELINK_ID_PORT, ELINK_RESET);
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}
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outb(ELINK_ID_PORT, 0x00);
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outb(ELINK_ID_PORT, 0x00);
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}
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/*
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* The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
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* bits are shifted in. Different board types use different polynomials.
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*/
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void
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elink_idseq(p)
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register u_char p;
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{
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register int i;
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register u_char c;
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c = 0xff;
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for (i = 255; i; i--) {
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outb(ELINK_ID_PORT, c);
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if (c & 0x80) {
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c <<= 1;
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c ^= p;
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} else
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c <<= 1;
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}
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}
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