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