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>
8 #include <linux/vgaarb.h>
9 #include <linux/screen_info.h>
11 #include <asm/machvec.h>
14 * Fixup to mark boot BIOS video selected by BIOS before it changes
16 * From information provided by "Jon Smirl" <jonsmirl@gmail.com>
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.
30 static void pci_fixup_video(struct pci_dev
*pdev
)
32 struct pci_dev
*bridge
;
36 if ((strcmp(ia64_platform_name
, "dig") != 0)
37 && (strcmp(ia64_platform_name
, "hpzx1") != 0))
39 /* Maybe, this machine supports legacy memory map. */
41 if (!vga_default_device()) {
42 resource_size_t start
, end
;
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
))
50 start
= pci_resource_start(pdev
, i
);
51 end
= pci_resource_end(pdev
, i
);
56 if (screen_info
.lfb_base
>= start
&&
57 (screen_info
.lfb_base
+ screen_info
.lfb_size
) < end
)
58 vga_set_default_device(pdev
);
62 /* Is VGA routed to us? */
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.
74 if (bridge
&& (pci_is_bridge(bridge
))) {
75 pci_read_config_word(bridge
, PCI_BRIDGE_CONTROL
,
77 if (!(config
& PCI_BRIDGE_CTL_VGA
))
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
);
91 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_ANY_ID
, PCI_ANY_ID
,
92 PCI_CLASS_DISPLAY_VGA
, 8, pci_fixup_video
);
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