1/* $NetBSD: pci_bus.c,v 1.2 2003/03/08 09:53:45 lukem Exp $ */
2
3/*
4 * Copyright 2001 Wasabi Systems, Inc.
5 * All rights reserved.
6 *
7 * Written by Jason R. Thorpe for Wasabi Systems, Inc.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. All advertising materials mentioning features or use of this software
18 * must display the following acknowledgement:
19 * This product includes software developed for the NetBSD Project by
20 * Wasabi Systems, Inc.
21 * 4. The name of Wasabi Systems, Inc. may not be used to endorse
22 * or promote products derived from this software without specific prior
23 * written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
27 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
28 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
29 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
30 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
31 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
32 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
33 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
35 * POSSIBILITY OF SUCH DAMAGE.
36 */
37
38/*
39 * Interface to PCI config space registers for a PCI domain.
40 */
41
42#include <sys/cdefs.h>
43__RCSID("$NetBSD: pci_bus.c,v 1.2 2003/03/08 09:53:45 lukem Exp $");
44
45#include <sys/types.h>
46#include <sys/ioctl.h>
47
48#include <pci.h>
49
50#include <dev/pci/pciio.h>
51
52/*
53 * pcibus_conf_read:
54 *
55 * Read a config word for a given bus/device/function.
56 */
57int
58pcibus_conf_read(int fd, u_int bus, u_int device, u_int func, u_int reg,
59 uint32_t *valp)
60{
61 struct pciio_bdf_cfgreg bdfr;
62 int rv;
63
64 bdfr.bus = bus;
65 bdfr.device = device;
66 bdfr.function = func;
67 bdfr.cfgreg.reg = reg;
68
69 rv = ioctl(fd, PCI_IOC_BDF_CFGREAD, &bdfr);
70 if (rv == -1) {
71 /* errno already set. */
72 return (-1);
73 }
74
75 *valp = bdfr.cfgreg.val;
76 return (0);
77}
78
79/*
80 * pcibus_conf_write:
81 *
82 * Write a config word for a given bus/device/function.
83 */
84int
85pcibus_conf_write(int fd, u_int bus, u_int device, u_int func, u_int reg,
86 uint32_t val)
87{
88 struct pciio_bdf_cfgreg bdfr;
89
90 bdfr.bus = bus;
91 bdfr.device = device;
92 bdfr.function = func;
93 bdfr.cfgreg.reg = reg;
94 bdfr.cfgreg.val = val;
95
96 return (ioctl(fd, PCI_IOC_BDF_CFGWRITE, &bdfr));
97}
98