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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> | |
17 | #include <asm/dma.h> | |
18 | ||
19 | static void via_bugs(void) | |
20 | { | |
21 | #ifdef CONFIG_IOMMU | |
22 | if ((end_pfn > MAX_DMA32_PFN || force_iommu) && | |
23 | !iommu_aperture_allowed) { | |
24 | printk(KERN_INFO | |
25 | "Looks like a VIA chipset. Disabling IOMMU. Override with iommu=allowed\n"); | |
26 | iommu_aperture_disabled = 1; | |
27 | } | |
28 | #endif | |
29 | } | |
30 | ||
31 | #ifdef CONFIG_ACPI | |
32 | ||
33 | static int nvidia_hpet_detected __initdata; | |
34 | ||
35 | static int __init nvidia_hpet_check(unsigned long phys, unsigned long size) | |
36 | { | |
37 | nvidia_hpet_detected = 1; | |
38 | return 0; | |
39 | } | |
40 | #endif | |
41 | ||
42 | static void nvidia_bugs(void) | |
43 | { | |
44 | #ifdef CONFIG_ACPI | |
45 | /* | |
46 | * All timer overrides on Nvidia are | |
47 | * wrong unless HPET is enabled. | |
48 | */ | |
49 | nvidia_hpet_detected = 0; | |
50 | acpi_table_parse(ACPI_HPET, nvidia_hpet_check); | |
51 | if (nvidia_hpet_detected == 0) { | |
52 | acpi_skip_timer_override = 1; | |
53 | printk(KERN_INFO "Nvidia board " | |
54 | "detected. Ignoring ACPI " | |
55 | "timer override.\n"); | |
56 | } | |
57 | #endif | |
58 | /* RED-PEN skip them on mptables too? */ | |
59 | ||
60 | } | |
61 | ||
62 | static void ati_bugs(void) | |
63 | { | |
64 | #if 1 /* for testing */ | |
65 | printk("ATI board detected\n"); | |
66 | #endif | |
67 | /* No bugs right now */ | |
68 | } | |
69 | ||
70 | struct chipset { | |
71 | u16 vendor; | |
72 | void (*f)(void); | |
73 | }; | |
74 | ||
75 | static struct chipset early_qrk[] = { | |
76 | { PCI_VENDOR_ID_NVIDIA, nvidia_bugs }, | |
77 | { PCI_VENDOR_ID_VIA, via_bugs }, | |
78 | { PCI_VENDOR_ID_ATI, ati_bugs }, | |
79 | {} | |
80 | }; | |
81 | ||
82 | void __init early_quirks(void) | |
83 | { | |
84 | int num, slot, func; | |
0637a70a AK |
85 | |
86 | if (!early_pci_allowed()) | |
87 | return; | |
88 | ||
dfa4698c AK |
89 | /* Poor man's PCI discovery */ |
90 | for (num = 0; num < 32; num++) { | |
91 | for (slot = 0; slot < 32; slot++) { | |
92 | for (func = 0; func < 8; func++) { | |
93 | u32 class; | |
94 | u32 vendor; | |
95 | u8 type; | |
96 | int i; | |
97 | class = read_pci_config(num,slot,func, | |
98 | PCI_CLASS_REVISION); | |
99 | if (class == 0xffffffff) | |
100 | break; | |
101 | ||
102 | if ((class >> 16) != PCI_CLASS_BRIDGE_PCI) | |
103 | continue; | |
104 | ||
105 | vendor = read_pci_config(num, slot, func, | |
106 | PCI_VENDOR_ID); | |
107 | vendor &= 0xffff; | |
108 | ||
109 | for (i = 0; early_qrk[i].f; i++) | |
110 | if (early_qrk[i].vendor == vendor) { | |
111 | early_qrk[i].f(); | |
112 | return; | |
113 | } | |
114 | ||
115 | type = read_pci_config_byte(num, slot, func, | |
116 | PCI_HEADER_TYPE); | |
117 | if (!(type & 0x80)) | |
118 | break; | |
119 | } | |
120 | } | |
121 | } | |
122 | } |