]>
Commit | Line | Data |
---|---|---|
6b5c76b8 EO |
1 | /* |
2 | * Exceptions for specific devices. Usually work-arounds for fatal design flaws. | |
3 | * Derived from fixup.c of i386 tree. | |
4 | */ | |
5 | ||
6 | #include <linux/pci.h> | |
7 | #include <linux/init.h> | |
058a2e1b | 8 | #include <linux/vgaarb.h> |
20cde694 | 9 | #include <linux/screen_info.h> |
6b5c76b8 EO |
10 | |
11 | #include <asm/machvec.h> | |
12 | ||
13 | /* | |
14 | * Fixup to mark boot BIOS video selected by BIOS before it changes | |
15 | * | |
16 | * From information provided by "Jon Smirl" <jonsmirl@gmail.com> | |
17 | * | |
18 | * The standard boot ROM sequence for an x86 machine uses the BIOS | |
19 | * to select an initial video card for boot display. This boot video | |
0c0e0736 | 20 | * card will have its BIOS copied to 0xC0000 in system RAM. |
6b5c76b8 EO |
21 | * IORESOURCE_ROM_SHADOW is used to associate the boot video |
22 | * card with this copy. On laptops this copy has to be used since | |
23 | * the main ROM may be compressed or combined with another image. | |
058a2e1b SE |
24 | * See pci_map_rom() for use of this flag. Before marking the device |
25 | * with IORESOURCE_ROM_SHADOW check if a vga_default_device is already set | |
0c0e0736 BH |
26 | * by either arch code or vga-arbitration; if so only apply the fixup to this |
27 | * already-determined primary video card. | |
6b5c76b8 EO |
28 | */ |
29 | ||
5b5e76e9 | 30 | static void pci_fixup_video(struct pci_dev *pdev) |
6b5c76b8 EO |
31 | { |
32 | struct pci_dev *bridge; | |
33 | struct pci_bus *bus; | |
34 | u16 config; | |
0c0e0736 | 35 | struct resource *res; |
6b5c76b8 | 36 | |
f9445a38 FW |
37 | if ((strcmp(ia64_platform_name, "dig") != 0) |
38 | && (strcmp(ia64_platform_name, "hpzx1") != 0)) | |
6b5c76b8 EO |
39 | return; |
40 | /* Maybe, this machine supports legacy memory map. */ | |
41 | ||
6b5c76b8 EO |
42 | /* Is VGA routed to us? */ |
43 | bus = pdev->bus; | |
44 | while (bus) { | |
45 | bridge = bus->self; | |
46 | ||
47 | /* | |
48 | * From information provided by | |
49 | * "David Miller" <davem@davemloft.net> | |
50 | * The bridge control register is valid for PCI header | |
51 | * type BRIDGE, or CARDBUS. Host to PCI controllers use | |
52 | * PCI header type NORMAL. | |
53 | */ | |
11a3bd09 | 54 | if (bridge && (pci_is_bridge(bridge))) { |
6b5c76b8 EO |
55 | pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, |
56 | &config); | |
57 | if (!(config & PCI_BRIDGE_CTL_VGA)) | |
58 | return; | |
59 | } | |
60 | bus = bus->parent; | |
61 | } | |
058a2e1b SE |
62 | if (!vga_default_device() || pdev == vga_default_device()) { |
63 | pci_read_config_word(pdev, PCI_COMMAND, &config); | |
64 | if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) { | |
0c0e0736 BH |
65 | res = &pdev->resource[PCI_ROM_RESOURCE]; |
66 | ||
67 | pci_disable_rom(pdev); | |
68 | if (res->parent) | |
69 | release_resource(res); | |
70 | ||
71 | res->start = 0xC0000; | |
72 | res->end = res->start + 0x20000 - 1; | |
73 | res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW | | |
74 | IORESOURCE_PCI_FIXED; | |
75 | dev_info(&pdev->dev, "Video device with shadowed ROM at %pR\n", | |
76 | res); | |
058a2e1b | 77 | } |
6b5c76b8 EO |
78 | } |
79 | } | |
058a2e1b SE |
80 | DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID, |
81 | PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_video); |