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alpha_pci_conf.c revision 1.2 
      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  * 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  * Support for accessing PCI configuration space.  This is currently
     41  * used to provide such support for XFree86.  In a perfect world, this
     42  * would go away in favor of a real bus space mapping framework.
     43  */
     44 
     45 #include <sys/param.h>
     46 
     47 #include <machine/sysarch.h>
     48 
     49 uint32_t
     50 alpha_pci_conf_read(u_int bus, u_int device, u_int func, u_int reg)
     51 {
     52 	struct alpha_pci_conf_readwrite_args args;
     53 
     54 	args.write = 0;
     55 	args.bus = bus;
     56 	args.device = device;
     57 	args.function = func;
     58 	args.reg = reg;
     59 
     60 	if (sysarch(ALPHA_PCI_CONF_READWRITE, &args) == -1)
     61 		return (0xffffffffU);
     62 
     63 	return (args.val);
     64 }
     65 
     66 void
     67 alpha_pci_conf_write(u_int bus, u_int device, u_int func, u_int reg,
     68     uint32_t val)
     69 {
     70 	struct alpha_pci_conf_readwrite_args args;
     71 
     72 	args.write = 1;
     73 	args.bus = bus;
     74 	args.device = device;
     75 	args.function = func;
     76 	args.reg = reg;
     77 	args.val = val;
     78 
     79 	(void) sysarch(ALPHA_PCI_CONF_READWRITE, &args);
     80 }
     81