xref: /freebsd/sys/dev/pci/fixup_pci.c (revision 8847579c57d6aff2b3371c707dce7a2cee8389aa)
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("$FreeBSD$");
33 
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
37 #include <sys/module.h>
38 #include <sys/systm.h>
39 #include <sys/bus.h>
40 
41 #include <dev/pci/pcivar.h>
42 #include <dev/pci/pcireg.h>
43 
44 /*
45  * Chipset fixups.
46  *
47  * These routines are invoked during the probe phase for devices which
48  * typically don't have specific device drivers, but which require
49  * some cleaning up.
50  */
51 
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);
55 
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),
60     { 0, 0 }
61 };
62 
63 static driver_t fixup_pci_driver = {
64     "fixup_pci",
65     fixup_pci_methods,
66     0,
67 };
68 
69 static devclass_t fixup_pci_devclass;
70 
71 DRIVER_MODULE(fixup_pci, pci, fixup_pci_driver, fixup_pci_devclass, 0, 0);
72 
73 static int
74 fixup_pci_probe(device_t dev)
75 {
76     switch (pci_get_devid(dev)) {
77     case 0x12378086:		/* Intel 82440FX (Natoma) */
78 	fixwsc_natoma(dev);
79 	break;
80     case 0x01e010de:		/* nVidia nForce2 */
81 	fixc1_nforce2(dev);
82 	break;
83     }
84     return(ENXIO);
85 }
86 
87 static void
88 fixwsc_natoma(device_t dev)
89 {
90     int		pmccfg;
91 
92     pmccfg = pci_read_config(dev, 0x50, 2);
93 #if defined(SMP)
94     if (pmccfg & 0x8000) {
95 	printf("Correcting Natoma config for SMP\n");
96 	pmccfg &= ~0x8000;
97 	pci_write_config(dev, 0x50, pmccfg, 2);
98     }
99 #else
100     if ((pmccfg & 0x8000) == 0) {
101 	printf("Correcting Natoma config for non-SMP\n");
102 	pmccfg |= 0x8000;
103 	pci_write_config(dev, 0x50, pmccfg, 2);
104     }
105 #endif
106 }
107 
108 /*
109  * Set the SYSTEM_IDLE_TIMEOUT to 80 ns on nForce2 systems to work
110  * around a hang that is triggered when the CPU generates a very fast
111  * CONNECT/HALT cycle sequence.  Specifically, the hang can result in
112  * the lapic timer being stopped.
113  *
114  * This requires changing the value for config register at offset 0x6c
115  * for the Host-PCI bridge at bus/dev/function 0/0/0:
116  *
117  * Chip	Current Value	New Value
118  * ----	----------	----------
119  * C17	0x1F0FFF01	0x1F01FF01
120  * C18D	0x9F0FFF01	0x9F01FF01
121  *
122  * We do this by always clearing the bits in 0x000e0000.
123  *
124  * See also: http://lkml.org/lkml/2004/5/3/157
125  */
126 static void
127 fixc1_nforce2(device_t dev)
128 {
129 	uint32_t val;
130 
131 	if (pci_get_bus(dev) == 0 && pci_get_slot(dev) == 0 &&
132 	    pci_get_function(dev) == 0) {
133 		val = pci_read_config(dev, 0x6c, 4);
134 		if (val & 0x000e0000) {
135 			printf("Correcting nForce2 C1 CPU disconnect hangs\n");
136 			val &= ~0x000e0000;
137 			pci_write_config(dev, 0x6c, val, 4);
138 		}
139 	}
140 }
141