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      1 /*	$NetBSD: alpha_pci_conf.c,v 1.3 2008/04/28 20:22:55 martin 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 }
     74