2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1994,1995 Stefan Esser, Wolfgang StanglMeier
5 * Copyright (c) 2000 Michael Smith <msmith@freebsd.org>
6 * Copyright (c) 2000 BSDi
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
36 #include <sys/param.h>
37 #include <sys/kernel.h>
38 #include <sys/malloc.h>
39 #include <sys/module.h>
40 #include <sys/systm.h>
43 #include <dev/pci/pcivar.h>
44 #include <dev/pci/pcireg.h>
49 * These routines are invoked during the probe phase for devices which
50 * typically don't have specific device drivers, but which require
54 static int fixup_pci_probe(device_t dev);
55 static void fixwsc_natoma(device_t dev);
56 static void fixc1_nforce2(device_t dev);
58 static device_method_t fixup_pci_methods[] = {
59 /* Device interface */
60 DEVMETHOD(device_probe, fixup_pci_probe),
61 DEVMETHOD(device_attach, bus_generic_attach),
65 static driver_t fixup_pci_driver = {
71 static devclass_t fixup_pci_devclass;
73 DRIVER_MODULE(fixup_pci, pci, fixup_pci_driver, fixup_pci_devclass, 0, 0);
76 fixup_pci_probe(device_t dev)
78 switch (pci_get_devid(dev)) {
79 case 0x12378086: /* Intel 82440FX (Natoma) */
82 case 0x01e010de: /* nVidia nForce2 */
90 fixwsc_natoma(device_t dev)
94 pmccfg = pci_read_config(dev, 0x50, 2);
96 if (pmccfg & 0x8000) {
97 device_printf(dev, "correcting Natoma config for SMP\n");
99 pci_write_config(dev, 0x50, pmccfg, 2);
102 if ((pmccfg & 0x8000) == 0) {
103 device_printf(dev, "correcting Natoma config for non-SMP\n");
105 pci_write_config(dev, 0x50, pmccfg, 2);
111 * Set the SYSTEM_IDLE_TIMEOUT to 80 ns on nForce2 systems to work
112 * around a hang that is triggered when the CPU generates a very fast
113 * CONNECT/HALT cycle sequence. Specifically, the hang can result in
114 * the lapic timer being stopped.
116 * This requires changing the value for config register at offset 0x6c
117 * for the Host-PCI bridge at bus/dev/function 0/0/0:
119 * Chip Current Value New Value
120 * ---- ---------- ----------
121 * C17 0x1F0FFF01 0x1F01FF01
122 * C18D 0x9F0FFF01 0x9F01FF01
124 * We do this by always clearing the bits in 0x000e0000.
126 * See also: http://lkml.org/lkml/2004/5/3/157
129 fixc1_nforce2(device_t dev)
133 if (pci_get_bus(dev) == 0 && pci_get_slot(dev) == 0 &&
134 pci_get_function(dev) == 0) {
135 val = pci_read_config(dev, 0x6c, 4);
136 if (val & 0x000e0000) {
138 "correcting nForce2 C1 CPU disconnect hangs\n");
140 pci_write_config(dev, 0x6c, val, 4);