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/dev/isa/elink.c

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    1 /*      $NetBSD: elink.c,v 1.14 2001/11/13 08:01:12 lukem Exp $ */
    2 
    3 /*-
    4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Jason R. Thorpe and Charles M. Hannum.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *        This product includes software developed by the NetBSD
   21  *        Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 /*
   40  * Common code for dealing with 3COM ethernet cards.
   41  */
   42 
   43 #include <sys/cdefs.h>
   44 __KERNEL_RCSID(0, "$NetBSD: elink.c,v 1.14 2001/11/13 08:01:12 lukem Exp $");
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/malloc.h>
   49 #include <sys/queue.h>
   50 
   51 #include <machine/bus.h>
   52 
   53 #include <dev/isa/elink.h>
   54 
   55 /*
   56  * This list keeps track of which ISAs have gotten an elink_reset().
   57  */
   58 struct elink_done_reset {
   59         LIST_ENTRY(elink_done_reset)    er_link;
   60         int                             er_bus;
   61 };
   62 static LIST_HEAD(, elink_done_reset) elink_all_resets;
   63 static int elink_all_resets_initialized;
   64 
   65 /*
   66  * Issue a `global reset' to all cards, and reset the ID state machines.  We
   67  * have to be careful to do the global reset only once during autoconfig, to
   68  * prevent resetting boards that have already been configured.
   69  *
   70  * The "bus" argument here is the unit number of the ISA bus, e.g. ""
   71  * if the bus is "isa0".
   72  *
   73  * NOTE: the caller MUST provide an access handle for ELINK_ID_PORT!
   74  */
   75 void
   76 elink_reset(iot, ioh, bus)
   77         bus_space_tag_t iot;
   78         bus_space_handle_t ioh;
   79         int bus;
   80 {
   81         struct elink_done_reset *er;
   82 
   83         if (elink_all_resets_initialized == 0) {
   84                 LIST_INIT(&elink_all_resets);
   85                 elink_all_resets_initialized = 1;
   86         }
   87 
   88         /*
   89          * Reset these cards if we haven't done so already.
   90          */
   91         for (er = elink_all_resets.lh_first; er != NULL;
   92             er = er->er_link.le_next)
   93                 if (er->er_bus == bus)
   94                         goto out;
   95 
   96         /* Mark this bus so we don't do it again. */
   97         er = (struct elink_done_reset *)malloc(sizeof(struct elink_done_reset),
   98             M_DEVBUF, M_NOWAIT);
   99         if (er == NULL)
  100                 panic("elink_reset: can't allocate state storage");
  101 
  102         er->er_bus = bus;
  103         LIST_INSERT_HEAD(&elink_all_resets, er, er_link);
  104 
  105         /* Haven't reset the cards on this bus, yet. */
  106         bus_space_write_1(iot, ioh, 0, ELINK_RESET);
  107 
  108  out:
  109         bus_space_write_1(iot, ioh, 0, 0x00);
  110         bus_space_write_1(iot, ioh, 0, 0x00);
  111 }
  112 
  113 /*
  114  * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
  115  * bits are shifted in.  Different board types use different polynomials.
  116  *
  117  * NOTE: the caller MUST provide an access handle for ELINK_ID_PORT!
  118  */
  119 void
  120 elink_idseq(iot, ioh, p)
  121         bus_space_tag_t iot;
  122         bus_space_handle_t ioh;
  123         u_char p;
  124 {
  125         int i;
  126         u_char c;
  127 
  128         c = 0xff;
  129         for (i = 255; i; i--) {
  130                 bus_space_write_1(iot, ioh, 0, c);
  131                 if (c & 0x80) {
  132                         c <<= 1;
  133                         c ^= p;
  134                 } else
  135                         c <<= 1;
  136         }
  137 }

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