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> |
6b5c76b8 EO |
9 | |
10 | #include <asm/machvec.h> | |
11 | ||
12 | /* | |
13 | * Fixup to mark boot BIOS video selected by BIOS before it changes | |
14 | * | |
15 | * From information provided by "Jon Smirl" <jonsmirl@gmail.com> | |
16 | * | |
17 | * The standard boot ROM sequence for an x86 machine uses the BIOS | |
18 | * to select an initial video card for boot display. This boot video | |
19 | * card will have it's BIOS copied to C0000 in system RAM. | |
20 | * IORESOURCE_ROM_SHADOW is used to associate the boot video | |
21 | * card with this copy. On laptops this copy has to be used since | |
22 | * the main ROM may be compressed or combined with another image. | |
058a2e1b SE |
23 | * See pci_map_rom() for use of this flag. Before marking the device |
24 | * with IORESOURCE_ROM_SHADOW check if a vga_default_device is already set | |
25 | * by either arch cde or vga-arbitration, if so only apply the fixup to this | |
26 | * already determined primary video card. | |
6b5c76b8 EO |
27 | */ |
28 | ||
5b5e76e9 | 29 | static void pci_fixup_video(struct pci_dev *pdev) |
6b5c76b8 EO |
30 | { |
31 | struct pci_dev *bridge; | |
32 | struct pci_bus *bus; | |
33 | u16 config; | |
34 | ||
f9445a38 FW |
35 | if ((strcmp(ia64_platform_name, "dig") != 0) |
36 | && (strcmp(ia64_platform_name, "hpzx1") != 0)) | |
6b5c76b8 EO |
37 | return; |
38 | /* Maybe, this machine supports legacy memory map. */ | |
39 | ||
6b5c76b8 EO |
40 | /* Is VGA routed to us? */ |
41 | bus = pdev->bus; | |
42 | while (bus) { | |
43 | bridge = bus->self; | |
44 | ||
45 | /* | |
46 | * From information provided by | |
47 | * "David Miller" <davem@davemloft.net> | |
48 | * The bridge control register is valid for PCI header | |
49 | * type BRIDGE, or CARDBUS. Host to PCI controllers use | |
50 | * PCI header type NORMAL. | |
51 | */ | |
11a3bd09 | 52 | if (bridge && (pci_is_bridge(bridge))) { |
6b5c76b8 EO |
53 | pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, |
54 | &config); | |
55 | if (!(config & PCI_BRIDGE_CTL_VGA)) | |
56 | return; | |
57 | } | |
58 | bus = bus->parent; | |
59 | } | |
058a2e1b SE |
60 | if (!vga_default_device() || pdev == vga_default_device()) { |
61 | pci_read_config_word(pdev, PCI_COMMAND, &config); | |
62 | if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) { | |
63 | pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW; | |
64 | dev_printk(KERN_DEBUG, &pdev->dev, "Boot video device\n"); | |
65 | vga_set_default_device(pdev); | |
66 | } | |
6b5c76b8 EO |
67 | } |
68 | } | |
058a2e1b SE |
69 | DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID, |
70 | PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_video); |