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 #include <linux/vgaarb.h> 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. 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. 27 */ 28 29 static void pci_fixup_video(struct pci_dev *pdev) 30 { 31 struct pci_dev *bridge; 32 struct pci_bus *bus; 33 u16 config; 34 35 if ((strcmp(ia64_platform_name, "dig") != 0) 36 && (strcmp(ia64_platform_name, "hpzx1") != 0)) 37 return; 38 /* Maybe, this machine supports legacy memory map. */ 39 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 */ 52 if (bridge && (pci_is_bridge(bridge))) { 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 } 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 } 67 } 68 } 69 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID, 70 PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_video); 71