elink.c revision 27555
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 1.7 1997/02/22 09:36:07 peter Exp $ 30 */ 31 32/* 33 * Common code for dealing with 3COM ethernet cards. 34 */ 35 36#include <sys/types.h> 37 38#include <machine/cpufunc.h> 39 40#include <i386/isa/elink.h> 41 42/* 43 * Issue a `global reset' to all cards. We have to be careful to do this only 44 * once during autoconfig, to prevent resetting boards that have already been 45 * configured. 46 */ 47void 48elink_reset() 49{ 50 static int x = 0; 51 52 if (x == 0) { 53 x = 1; 54 outb(ELINK_ID_PORT, ELINK_RESET); 55 } 56} 57 58/* 59 * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0 60 * bits are shifted in. Different board types use different polynomials. 61 */ 62void 63elink_idseq(p) 64 register u_char p; 65{ 66 register int i; 67 register u_char c; 68 69 c = 0xff; 70 for (i = 255; i; i--) { 71 outb(ELINK_ID_PORT, c); 72 if (c & 0x80) { 73 c <<= 1; 74 c ^= p; 75 } else 76 c <<= 1; 77 } 78} 79