fixup_pci.c revision 119418 
1/*-
2 * Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
3 * Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
4 * Copyright (c) 2000 BSDi
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 *    derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: head/sys/dev/pci/fixup_pci.c 119418 2003-08-24 17:55:58Z obrien $");
33
34#include <sys/param.h>
35#include <sys/systm.h>
36#include <sys/malloc.h>
37#include <sys/kernel.h>
38#include <sys/bus.h>
39
40#include <dev/pci/pcivar.h>
41#include <dev/pci/pcireg.h>
42
43/*
44 * Chipset fixups.
45 *
46 * These routines are invoked during the probe phase for devices which
47 * typically don't have specific device drivers, but which require
48 * some cleaning up.
49 */
50
51static int	fixup_pci_probe(device_t dev);
52static void	fixwsc_natoma(device_t dev);
53
54static device_method_t fixup_pci_methods[] = {
55    /* Device interface */
56    DEVMETHOD(device_probe,		fixup_pci_probe),
57    DEVMETHOD(device_attach,		bus_generic_attach),
58    { 0, 0 }
59};
60
61static driver_t fixup_pci_driver = {
62    "fixup_pci",
63    fixup_pci_methods,
64    0,
65};
66
67static devclass_t fixup_pci_devclass;
68
69DRIVER_MODULE(fixup_pci, pci, fixup_pci_driver, fixup_pci_devclass, 0, 0);
70
71static int
72fixup_pci_probe(device_t dev)
73{
74    switch (pci_get_devid(dev)) {
75    case 0x12378086:		/* Intel 82440FX (Natoma) */
76	fixwsc_natoma(dev);
77	break;
78    }
79    return(ENXIO);
80}
81
82static void
83fixwsc_natoma(device_t dev)
84{
85    int		pmccfg;
86
87    pmccfg = pci_read_config(dev, 0x50, 2);
88#if defined(SMP)
89    if (pmccfg & 0x8000) {
90	printf("Correcting Natoma config for SMP\n");
91	pmccfg &= ~0x8000;
92	pci_write_config(dev, 0x50, pmccfg, 2);
93    }
94#else
95    if ((pmccfg & 0x8000) == 0) {
96	printf("Correcting Natoma config for non-SMP\n");
97	pmccfg |= 0x8000;
98	pci_write_config(dev, 0x50, pmccfg, 2);
99    }
100#endif
101}
102