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
29static 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
53		    &&((bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE)
54		       ||(bridge->hdr_type == PCI_HEADER_TYPE_CARDBUS))) {
55			pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
56						&config);
57			if (!(config & PCI_BRIDGE_CTL_VGA))
58				return;
59		}
60		bus = bus->parent;
61	}
62	if (!vga_default_device() || pdev == vga_default_device()) {
63		pci_read_config_word(pdev, PCI_COMMAND, &config);
64		if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {
65			pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;
66			dev_printk(KERN_DEBUG, &pdev->dev, "Boot video device\n");
67			vga_set_default_device(pdev);
68		}
69	}
70}
71DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID, PCI_ANY_ID,
72				PCI_CLASS_DISPLAY_VGA, 8, pci_fixup_video);