2 * Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
3 * Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
4 * Copyright (c) 2000 BSDi
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
30 * $FreeBSD: src/sys/dev/pci/fixup_pci.c,v 1.7.8.1 2009/04/15 03:14:26 kensmith Exp $
33 #include <sys/param.h>
34 #include <sys/kernel.h>
35 #include <sys/malloc.h>
36 #include <sys/module.h>
37 #include <sys/systm.h>
39 #include <sys/types.h>
41 #include <bus/pci/pcivar.h>
42 #include <bus/pci/pcireg.h>
47 * These routines are invoked during the probe phase for devices which
48 * typically don't have specific device drivers, but which require
52 static int fixup_pci_probe(device_t dev
);
53 static void fixwsc_natoma(device_t dev
);
54 static void fixc1_nforce2(device_t dev
);
56 static device_method_t fixup_pci_methods
[] = {
57 /* Device interface */
58 DEVMETHOD(device_probe
, fixup_pci_probe
),
59 DEVMETHOD(device_attach
, bus_generic_attach
),
63 static driver_t fixup_pci_driver
= {
69 static devclass_t fixup_pci_devclass
;
71 DRIVER_MODULE(fixup_pci
, pci
, fixup_pci_driver
, fixup_pci_devclass
, NULL
, NULL
);
74 fixup_pci_probe(device_t dev
)
76 switch (pci_get_devid(dev
)) {
77 case 0x12378086: /* Intel 82440FX (Natoma) */
80 case 0x01e010de: /* nVidia nForce2 */
88 fixwsc_natoma(device_t dev
)
92 pmccfg
= pci_read_config(dev
, 0x50, 2);
93 if (pmccfg
& 0x8000) {
94 kprintf("Correcting Natoma config for SMP\n");
96 pci_write_config(dev
, 0x50, pmccfg
, 2);
101 * Set the SYSTEM_IDLE_TIMEOUT to 80 ns on nForce2 systems to work
102 * around a hang that is triggered when the CPU generates a very fast
103 * CONNECT/HALT cycle sequence. Specifically, the hang can result in
104 * the lapic timer being stopped.
106 * This requires changing the value for config register at offset 0x6c
107 * for the Host-PCI bridge at bus/dev/function 0/0/0:
109 * Chip Current Value New Value
110 * ---- ---------- ----------
111 * C17 0x1F0FFF01 0x1F01FF01
112 * C18D 0x9F0FFF01 0x9F01FF01
114 * We do this by always clearing the bits in 0x000e0000.
116 * See also: http://lkml.org/lkml/2004/5/3/157
119 fixc1_nforce2(device_t dev
)
123 if (pci_get_bus(dev
) == 0 && pci_get_slot(dev
) == 0 &&
124 pci_get_function(dev
) == 0) {
125 val
= pci_read_config(dev
, 0x6c, 4);
126 if (val
& 0x000e0000) {
127 kprintf("Correcting nForce2 C1 CPU disconnect hangs\n");
129 pci_write_config(dev
, 0x6c, val
, 4);