lib/libarch/alpha/alpha_pci_conf.c

   1 /*      $NetBSD: alpha_pci_conf.c,v 1.2 2001/07/17 17:46:42 thorpej Exp $       */
   2
   3 /*-
   4  * Copyright (c) 2000 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.
   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  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * Support for accessing PCI configuration space.  This is currently
  34  * used to provide such support for XFree86.  In a perfect world, this
  35  * would go away in favor of a real bus space mapping framework.
  36  */
  37
  38 #include <sys/param.h>
  39
  40 #include <machine/sysarch.h>
  41
  42 uint32_t
  43 alpha_pci_conf_read(u_int bus, u_int device, u_int func, u_int reg)
  44 {
  45         struct alpha_pci_conf_readwrite_args args;
  46
  47         args.write = 0;
  48         args.bus = bus;
  49         args.device = device;
  50         args.function = func;
  51         args.reg = reg;
  52
  53         if (sysarch(ALPHA_PCI_CONF_READWRITE, &args) == -1)
  54                 return (0xffffffffU);
  55
  56         return (args.val);
  57 }
  58
  59 void
  60 alpha_pci_conf_write(u_int bus, u_int device, u_int func, u_int reg,
  61     uint32_t val)
  62 {
  63         struct alpha_pci_conf_readwrite_args args;
  64
  65         args.write = 1;
  66         args.bus = bus;
  67         args.device = device;
  68         args.function = func;
  69         args.reg = reg;
  70         args.val = val;
  71
  72         (void) sysarch(ALPHA_PCI_CONF_READWRITE, &args);
  73 }