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elink.c revision 1.2 
      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 1.2 1994/02/16 19:28:19 mycroft Exp $
     30  */
     31 
     32 /*
     33  * Common code for dealing with 3COM ethernet cards.
     34  */
     35 
     36 #include <sys/types.h>
     37 #include <machine/pio.h>
     38 #include <i386/isa/elink.h>
     39 
     40 /*
     41  * Issue a `global reset' to all cards.  We have to be careful to do this only
     42  * once during autoconfig, to prevent resetting boards that have already been
     43  * configured.
     44  */
     45 void
     46 elink_reset()
     47 {
     48 	static int x = 0;
     49 
     50 	if (x == 0) {
     51 		x = 1;
     52 		outb(ELINK_ID_PORT, ELINK_RESET);
     53 	}
     54 }
     55 
     56 /*
     57  * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
     58  * bits are shifted in.  Different board types use different polynomials.
     59  */
     60 void
     61 elink_idseq(p)
     62 	register u_char p;
     63 {
     64 	register int i;
     65 	register u_char c;
     66 
     67 	c = 0xff;
     68 	for (i = 255; i; i--) {
     69 		outb(ELINK_ID_PORT, c);
     70 		if (c & 0x80) {
     71 			c <<= 1;
     72 			c ^= p;
     73 		} else
     74 			c <<= 1;
     75 	}
     76 }
     77