| /* | |
| * Exceptions for specific devices. Usually work-arounds for fatal design flaws. | |
| * Derived from fixup.c of i386 tree. | |
| */ | |
| #include <linux/pci.h> | |
| #include <linux/init.h> | |
| #include <asm/machvec.h> | |
| /* | |
| * Fixup to mark boot BIOS video selected by BIOS before it changes | |
| * | |
| * From information provided by "Jon Smirl" <[email protected]> | |
| * | |
| * The standard boot ROM sequence for an x86 machine uses the BIOS | |
| * to select an initial video card for boot display. This boot video | |
| * card will have it's BIOS copied to C0000 in system RAM. | |
| * IORESOURCE_ROM_SHADOW is used to associate the boot video | |
| * card with this copy. On laptops this copy has to be used since | |
| * the main ROM may be compressed or combined with another image. | |
| * See pci_map_rom() for use of this flag. IORESOURCE_ROM_SHADOW | |
| * is marked here since the boot video device will be the only enabled | |
| * video device at this point. | |
| */ | |
| static void __devinit pci_fixup_video(struct pci_dev *pdev) | |
| { | |
| struct pci_dev *bridge; | |
| struct pci_bus *bus; | |
| u16 config; | |
| if ((strcmp(platform_name, "dig") != 0) | |
| && (strcmp(platform_name, "hpzx1") != 0)) | |
| return; | |
| /* Maybe, this machine supports legacy memory map. */ | |
| if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA) | |
| return; | |
| /* Is VGA routed to us? */ | |
| bus = pdev->bus; | |
| while (bus) { | |
| bridge = bus->self; | |
| /* | |
| * From information provided by | |
| * "David Miller" <[email protected]> | |
| * The bridge control register is valid for PCI header | |
| * type BRIDGE, or CARDBUS. Host to PCI controllers use | |
| * PCI header type NORMAL. | |
| */ | |
| if (bridge | |
| &&((bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE) | |
| ||(bridge->hdr_type == PCI_HEADER_TYPE_CARDBUS))) { | |
| pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, | |
| &config); | |
| if (!(config & PCI_BRIDGE_CTL_VGA)) | |
| return; | |
| } | |
| bus = bus->parent; | |
| } | |
| pci_read_config_word(pdev, PCI_COMMAND, &config); | |
| if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) { | |
| pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW; | |
| dev_printk(KERN_DEBUG, &pdev->dev, "Boot video device\n"); | |
| } | |
| } | |
| DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_video); |