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> | |
8 | ||
9 | #include <asm/machvec.h> | |
10 | ||
11 | /* | |
12 | * Fixup to mark boot BIOS video selected by BIOS before it changes | |
13 | * | |
14 | * From information provided by "Jon Smirl" <jonsmirl@gmail.com> | |
15 | * | |
16 | * The standard boot ROM sequence for an x86 machine uses the BIOS | |
17 | * to select an initial video card for boot display. This boot video | |
18 | * card will have it's BIOS copied to C0000 in system RAM. | |
19 | * IORESOURCE_ROM_SHADOW is used to associate the boot video | |
20 | * card with this copy. On laptops this copy has to be used since | |
21 | * the main ROM may be compressed or combined with another image. | |
22 | * See pci_map_rom() for use of this flag. IORESOURCE_ROM_SHADOW | |
23 | * is marked here since the boot video device will be the only enabled | |
24 | * video device at this point. | |
25 | */ | |
26 | ||
5b5e76e9 | 27 | static void pci_fixup_video(struct pci_dev *pdev) |
6b5c76b8 EO |
28 | { |
29 | struct pci_dev *bridge; | |
30 | struct pci_bus *bus; | |
31 | u16 config; | |
32 | ||
f9445a38 FW |
33 | if ((strcmp(ia64_platform_name, "dig") != 0) |
34 | && (strcmp(ia64_platform_name, "hpzx1") != 0)) | |
6b5c76b8 EO |
35 | return; |
36 | /* Maybe, this machine supports legacy memory map. */ | |
37 | ||
38 | if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA) | |
39 | return; | |
40 | ||
41 | /* Is VGA routed to us? */ | |
42 | bus = pdev->bus; | |
43 | while (bus) { | |
44 | bridge = bus->self; | |
45 | ||
46 | /* | |
47 | * From information provided by | |
48 | * "David Miller" <davem@davemloft.net> | |
49 | * The bridge control register is valid for PCI header | |
50 | * type BRIDGE, or CARDBUS. Host to PCI controllers use | |
51 | * PCI header type NORMAL. | |
52 | */ | |
53 | if (bridge | |
54 | &&((bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE) | |
55 | ||(bridge->hdr_type == PCI_HEADER_TYPE_CARDBUS))) { | |
56 | pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, | |
57 | &config); | |
58 | if (!(config & PCI_BRIDGE_CTL_VGA)) | |
59 | return; | |
60 | } | |
61 | bus = bus->parent; | |
62 | } | |
63 | pci_read_config_word(pdev, PCI_COMMAND, &config); | |
64 | if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) { | |
65 | pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW; | |
1ab40ec8 | 66 | dev_printk(KERN_DEBUG, &pdev->dev, "Boot video device\n"); |
6b5c76b8 EO |
67 | } |
68 | } | |
69 | DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_video); |