FreeBSD/Linux Kernel Cross Reference
sys/dev/ep/elink.c

     /*-
      * SPDX-License-Identifier: BSD-4-Clause
      *
      * Copyright (c) 1994, 1995 Charles Hannum.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 3. All advertising materials mentioning features or use of this software
     *    must display the following acknowledgement:
     *      This product includes software developed by Charles Hannum.
     * 4. The name of the author may not be used to endorse or promote products
     *    derived from this software without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     *
     * $NetBSD: elink.c,v 1.6 1995/01/07 21:37:54 mycroft Exp $
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/12.0/sys/dev/ep/elink.c 327384 2017-12-30 19:27:22Z cy $");
    
    /*
     * Common code for dealing with 3COM ethernet cards.
     */
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <sys/kernel.h>
    #include <sys/module.h>
    
    #include <machine/cpufunc.h>
    
    #include <dev/ep/elink.h>
    
    /*
     * Issue a `global reset' to all cards, and reset the ID state machines.  We
     * have to be careful to do the global reset only once during autoconfig, to
     * prevent resetting boards that have already been configured.
     */
    void
    elink_reset()
    {
            static int x = 0;
    
            if (x == 0) {
                    x = 1;
                    outb(ELINK_ID_PORT, ELINK_RESET);
            }
            outb(ELINK_ID_PORT, 0x00);
            outb(ELINK_ID_PORT, 0x00);
    
            return;
    }
    
    /*
     * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
     * bits are shifted in.  Different board types use different polynomials.
     */
    void
    elink_idseq(u_char p)
    {
            int i;
            u_char c;
    
            c = 0xff;
            for (i = 255; i; i--) {
                    outb(ELINK_ID_PORT, c);
                    if (c & 0x80) {
                            c <<= 1;
                            c ^= p;
                    } else
                            c <<= 1;
            }
    }
    
    static moduledata_t elink_mod = {
            "elink",/* module name */
            NULL,   /* event handler */
            0       /* extra data */
    };
    
    DECLARE_MODULE(elink, elink_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
    MODULE_VERSION(elink, 1);

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