Commit | Line | Data |
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dfa4698c AK |
1 | /* Various workarounds for chipset bugs. |
2 | This code runs very early and can't use the regular PCI subsystem | |
3 | The entries are keyed to PCI bridges which usually identify chipsets | |
4 | uniquely. | |
5 | This is only for whole classes of chipsets with specific problems which | |
6 | need early invasive action (e.g. before the timers are initialized). | |
7 | Most PCI device specific workarounds can be done later and should be | |
8 | in standard PCI quirks | |
9 | Mainboard specific bugs should be handled by DMI entries. | |
10 | CPU specific bugs in setup.c */ | |
11 | ||
12 | #include <linux/pci.h> | |
13 | #include <linux/acpi.h> | |
14 | #include <linux/pci_ids.h> | |
15 | #include <asm/pci-direct.h> | |
16 | #include <asm/proto.h> | |
f2cf8e08 | 17 | #include <asm/iommu.h> |
dfa4698c AK |
18 | #include <asm/dma.h> |
19 | ||
43999d9e | 20 | static void __init via_bugs(void) |
dfa4698c AK |
21 | { |
22 | #ifdef CONFIG_IOMMU | |
23 | if ((end_pfn > MAX_DMA32_PFN || force_iommu) && | |
24 | !iommu_aperture_allowed) { | |
25 | printk(KERN_INFO | |
26 | "Looks like a VIA chipset. Disabling IOMMU. Override with iommu=allowed\n"); | |
27 | iommu_aperture_disabled = 1; | |
28 | } | |
29 | #endif | |
30 | } | |
31 | ||
32 | #ifdef CONFIG_ACPI | |
33 | ||
15a58ed1 | 34 | static int __init nvidia_hpet_check(struct acpi_table_header *header) |
dfa4698c | 35 | { |
dfa4698c AK |
36 | return 0; |
37 | } | |
38 | #endif | |
39 | ||
43999d9e | 40 | static void __init nvidia_bugs(void) |
dfa4698c AK |
41 | { |
42 | #ifdef CONFIG_ACPI | |
43 | /* | |
44 | * All timer overrides on Nvidia are | |
45 | * wrong unless HPET is enabled. | |
fa18f477 AK |
46 | * Unfortunately that's not true on many Asus boards. |
47 | * We don't know yet how to detect this automatically, but | |
48 | * at least allow a command line override. | |
dfa4698c | 49 | */ |
fa18f477 AK |
50 | if (acpi_use_timer_override) |
51 | return; | |
52 | ||
fe699336 | 53 | if (acpi_table_parse(ACPI_SIG_HPET, nvidia_hpet_check)) { |
dfa4698c AK |
54 | acpi_skip_timer_override = 1; |
55 | printk(KERN_INFO "Nvidia board " | |
56 | "detected. Ignoring ACPI " | |
57 | "timer override.\n"); | |
fa18f477 AK |
58 | printk(KERN_INFO "If you got timer trouble " |
59 | "try acpi_use_timer_override\n"); | |
dfa4698c AK |
60 | } |
61 | #endif | |
62 | /* RED-PEN skip them on mptables too? */ | |
63 | ||
64 | } | |
65 | ||
43999d9e | 66 | static void __init ati_bugs(void) |
dfa4698c | 67 | { |
fea5f1e1 LT |
68 | if (timer_over_8254 == 1) { |
69 | timer_over_8254 = 0; | |
70 | printk(KERN_INFO | |
71 | "ATI board detected. Disabling timer routing over 8254.\n"); | |
72 | } | |
dfa4698c AK |
73 | } |
74 | ||
75 | struct chipset { | |
76 | u16 vendor; | |
77 | void (*f)(void); | |
78 | }; | |
79 | ||
c993c735 | 80 | static struct chipset early_qrk[] __initdata = { |
dfa4698c AK |
81 | { PCI_VENDOR_ID_NVIDIA, nvidia_bugs }, |
82 | { PCI_VENDOR_ID_VIA, via_bugs }, | |
83 | { PCI_VENDOR_ID_ATI, ati_bugs }, | |
84 | {} | |
85 | }; | |
86 | ||
87 | void __init early_quirks(void) | |
88 | { | |
89 | int num, slot, func; | |
0637a70a AK |
90 | |
91 | if (!early_pci_allowed()) | |
92 | return; | |
93 | ||
dfa4698c AK |
94 | /* Poor man's PCI discovery */ |
95 | for (num = 0; num < 32; num++) { | |
96 | for (slot = 0; slot < 32; slot++) { | |
97 | for (func = 0; func < 8; func++) { | |
98 | u32 class; | |
99 | u32 vendor; | |
100 | u8 type; | |
101 | int i; | |
102 | class = read_pci_config(num,slot,func, | |
103 | PCI_CLASS_REVISION); | |
104 | if (class == 0xffffffff) | |
105 | break; | |
106 | ||
107 | if ((class >> 16) != PCI_CLASS_BRIDGE_PCI) | |
108 | continue; | |
109 | ||
110 | vendor = read_pci_config(num, slot, func, | |
111 | PCI_VENDOR_ID); | |
112 | vendor &= 0xffff; | |
113 | ||
114 | for (i = 0; early_qrk[i].f; i++) | |
115 | if (early_qrk[i].vendor == vendor) { | |
116 | early_qrk[i].f(); | |
117 | return; | |
118 | } | |
119 | ||
120 | type = read_pci_config_byte(num, slot, func, | |
121 | PCI_HEADER_TYPE); | |
122 | if (!(type & 0x80)) | |
123 | break; | |
124 | } | |
125 | } | |
126 | } | |
127 | } |