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 #include <linux/screen_info.h> 10 11 #include <asm/machvec.h> 12 13 /* 14 * Fixup to mark boot BIOS video selected by BIOS before it changes 15 * 16 * From information provided by "Jon Smirl" <jonsmirl@gmail.com> 17 * 18 * The standard boot ROM sequence for an x86 machine uses the BIOS 19 * to select an initial video card for boot display. This boot video 20 * card will have it's BIOS copied to C0000 in system RAM. 21 * IORESOURCE_ROM_SHADOW is used to associate the boot video 22 * card with this copy. On laptops this copy has to be used since 23 * the main ROM may be compressed or combined with another image. 24 * See pci_map_rom() for use of this flag. Before marking the device 25 * with IORESOURCE_ROM_SHADOW check if a vga_default_device is already set 26 * by either arch cde or vga-arbitration, if so only apply the fixup to this 27 * already determined primary video card. 28 */ 29 30 static void pci_fixup_video(struct pci_dev *pdev) 31 { 32 struct pci_dev *bridge; 33 struct pci_bus *bus; 34 u16 config; 35 36 if ((strcmp(ia64_platform_name, "dig") != 0) 37 && (strcmp(ia64_platform_name, "hpzx1") != 0)) 38 return; 39 /* Maybe, this machine supports legacy memory map. */ 40 41 if (!vga_default_device()) { 42 resource_size_t start, end; 43 int i; 44 45 /* Does firmware framebuffer belong to us? */ 46 for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) { 47 if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM)) 48 continue; 49 50 start = pci_resource_start(pdev, i); 51 end = pci_resource_end(pdev, i); 52 53 if (!start || !end) 54 continue; 55 56 if (screen_info.lfb_base >= start && 57 (screen_info.lfb_base + screen_info.lfb_size) < end) 58 vga_set_default_device(pdev); 59 } 60 } 61 62 /* Is VGA routed to us? */ 63 bus = pdev->bus; 64 while (bus) { 65 bridge = bus->self; 66 67 /* 68 * From information provided by 69 * "David Miller" <davem@davemloft.net> 70 * The bridge control register is valid for PCI header 71 * type BRIDGE, or CARDBUS. Host to PCI controllers use 72 * PCI header type NORMAL. 73 */ 74 if (bridge && (pci_is_bridge(bridge))) { 75 pci_read_config_word(bridge, PCI_BRIDGE_CONTROL, 76 &config); 77 if (!(config & PCI_BRIDGE_CTL_VGA)) 78 return; 79 } 80 bus = bus->parent; 81 } 82 if (!vga_default_device() || pdev == vga_default_device()) { 83 pci_read_config_word(pdev, PCI_COMMAND, &config); 84 if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) { 85 pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW; 86 dev_printk(KERN_DEBUG, &pdev->dev, "Boot video device\n"); 87 vga_set_default_device(pdev); 88 } 89 } 90 } 91 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID, 92 PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_video); 93