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elink.c revision 1.6 
      1 /*	$NetBSD: elink.c,v 1.6 1995/01/07 21:37:54 mycroft Exp $	*/
      2 
      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 
     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, and reset the ID state machines.  We
     42  * have to be careful to do the global reset only once during autoconfig, to
     43  * prevent resetting boards that have already been 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 	outb(ELINK_ID_PORT, 0x00);
     55 	outb(ELINK_ID_PORT, 0x00);
     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  */
     62 void
     63 elink_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