The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/i386/isa/elink.c

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

Cache object: e48601d2a6077f834f390653d0ddb4fe


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