2
* Exceptions for specific devices. Usually work-arounds for fatal design flaws.
3
* Derived from fixup.c of i386 tree.
7
#include <linux/init.h>
9
#include <asm/machvec.h>
12
* Fixup to mark boot BIOS video selected by BIOS before it changes
14
* From information provided by "Jon Smirl" <jonsmirl@gmail.com>
16
* The standard boot ROM sequence for an x86 machine uses the BIOS
17
* to select an initial video card for boot display. This boot video
18
* card will have it's BIOS copied to C0000 in system RAM.
19
* IORESOURCE_ROM_SHADOW is used to associate the boot video
20
* card with this copy. On laptops this copy has to be used since
21
* the main ROM may be compressed or combined with another image.
22
* See pci_map_rom() for use of this flag. IORESOURCE_ROM_SHADOW
23
* is marked here since the boot video device will be the only enabled
24
* video device at this point.
27
static void __devinit pci_fixup_video(struct pci_dev *pdev)
29
struct pci_dev *bridge;
33
if ((strcmp(platform_name, "dig") != 0)
34
&& (strcmp(platform_name, "hpzx1") != 0))
36
/* Maybe, this machine supports legacy memory map. */
38
if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
41
/* Is VGA routed to us? */
47
* From information provided by
48
* "David Miller" <davem@davemloft.net>
49
* The bridge control register is valid for PCI header
50
* type BRIDGE, or CARDBUS. Host to PCI controllers use
51
* PCI header type NORMAL.
54
&&((bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE)
55
||(bridge->hdr_type == PCI_HEADER_TYPE_CARDBUS))) {
56
pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,
58
if (!(config & PCI_BRIDGE_CTL_VGA))
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");
69
DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_video);