| Eiichiro Oiwa | 6b5c76b | 2006-10-23 15:14:07 +0900 | [diff] [blame] | 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 | |
| 27 | static void __devinit pci_fixup_video(struct pci_dev *pdev) |
| 28 | { |
| 29 | struct pci_dev *bridge; |
| 30 | struct pci_bus *bus; |
| 31 | u16 config; |
| 32 | |
| 33 | if ((strcmp(platform_name, "dig") != 0) |
| 34 | && (strcmp(platform_name, "hpzx1") != 0)) |
| 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; |
| Bjorn Helgaas | 1ab40ec | 2008-03-04 16:34:57 -0700 | [diff] [blame] | 66 | dev_printk(KERN_DEBUG, &pdev->dev, "Boot video device\n"); |
| Eiichiro Oiwa | 6b5c76b | 2006-10-23 15:14:07 +0900 | [diff] [blame] | 67 | } |
| 68 | } |
| 69 | DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_video); |