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80 lines
2.4 KiB
80 lines
2.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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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 <linux/vgaarb.h> |
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#include <linux/screen_info.h> |
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#include <asm/uv/uv.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" <[email protected]> |
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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 its BIOS copied to 0xC0000 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. Before marking the device |
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* with IORESOURCE_ROM_SHADOW check if a vga_default_device is already set |
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* by either arch code or vga-arbitration; if so only apply the fixup to this |
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* already-determined primary video card. |
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*/ |
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static void 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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struct resource *res; |
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if (is_uv_system()) |
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return; |
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/* Maybe, this machine supports legacy memory map. */ |
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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" <[email protected]> |
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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 && (pci_is_bridge(bridge))) { |
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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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if (!vga_default_device() || pdev == vga_default_device()) { |
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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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res = &pdev->resource[PCI_ROM_RESOURCE]; |
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pci_disable_rom(pdev); |
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if (res->parent) |
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release_resource(res); |
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res->start = 0xC0000; |
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res->end = res->start + 0x20000 - 1; |
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res->flags = IORESOURCE_MEM | IORESOURCE_ROM_SHADOW | |
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IORESOURCE_PCI_FIXED; |
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dev_info(&pdev->dev, "Video device with shadowed ROM at %pR\n", |
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res); |
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} |
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} |
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} |
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DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID, |
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PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_video);
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