Commit b5e4efe7 authored by eiichiro.oiwa.nm@hitachi.com's avatar eiichiro.oiwa.nm@hitachi.com Committed by Greg Kroah-Hartman
Browse files

PCI: Turn pci_fixup_video into generic for embedded VGA 



pci_fixup_video turns into generic code because there are many platforms need this fixup
for embedded VGA as well as x86. The Video BIOS integrates into System BIOS on a machine
has embedded VGA although embedded VGA generally don't have PCI ROM. As a result,
embedded VGA need the way that the sysfs rom points to the Video BIOS of System
RAM (0xC0000). PCI-to-PCI Bridge Architecture specification describes the condition whether
or not PCI ROM forwards VGA compatible memory address. fixup_video suits this specification.
Although the Video ROM generally implements in x86 code regardless of platform, some
application such as X Window System can run this code by dosemu86. Therefore,
pci_fixup_video should turn into generic code.


Signed-off-by: default avatarEiichiro Oiwa <eiichiro.oiwa.nm@hitachi.com>
Acked-by: default avatarAlan Cox <alan@redhat.com>
Acked-by: default avatarJesse Barnes <jesse.barnes@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent bacedce3

arch/i386/pci/fixup.c

+0 −45
Original line number Diff line number Diff line
@@ -342,51 +342,6 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_MCH_PB1, pcie_r 
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PC,	pcie_rootport_aspm_quirk );

DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,	PCI_DEVICE_ID_INTEL_MCH_PC1,	pcie_rootport_aspm_quirk );



/*

 * Fixup to mark boot BIOS video selected by BIOS before it changes

 *

 * From information provided by "Jon Smirl" <jonsmirl@gmail.com>

 *

 * The standard boot ROM sequence for an x86 machine uses the BIOS

 * to select an initial video card for boot display. This boot video 

 * card will have it's BIOS copied to C0000 in system RAM. 

 * IORESOURCE_ROM_SHADOW is used to associate the boot video

 * card with this copy. On laptops this copy has to be used since

 * the main ROM may be compressed or combined with another image.

 * See pci_map_rom() for use of this flag. IORESOURCE_ROM_SHADOW

 * is marked here since the boot video device will be the only enabled

 * video device at this point.

 */



static void __devinit pci_fixup_video(struct pci_dev *pdev)

{

	struct pci_dev *bridge;

	struct pci_bus *bus;

	u16 config;



	if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)

		return;



	/* Is VGA routed to us? */

	bus = pdev->bus;

	while (bus) {

		bridge = bus->self;

		if (bridge) {

			pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,

						&config);

			if (!(config & PCI_BRIDGE_CTL_VGA))

				return;

		}

		bus = bus->parent;

	}

	pci_read_config_word(pdev, PCI_COMMAND, &config);

	if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {

		pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;

		printk(KERN_DEBUG "Boot video device is %s\n", pci_name(pdev));

	}

}

DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, pci_fixup_video);



/*

 * Some Toshiba laptops need extra code to enable their TI TSB43AB22/A.

 *

drivers/pci/quirks.c

+45 −0
Original line number Diff line number Diff line
@@ -1619,6 +1619,51 @@ static void __devinit fixup_rev1_53c810(struct pci_dev* dev) 
}

DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NCR, PCI_DEVICE_ID_NCR_53C810, fixup_rev1_53c810);



/*

 * Fixup to mark boot BIOS video selected by BIOS before it changes

 *

 * From information provided by "Jon Smirl" <jonsmirl@gmail.com>

 *

 * The standard boot ROM sequence for an x86 machine uses the BIOS

 * to select an initial video card for boot display. This boot video

 * card will have it's BIOS copied to C0000 in system RAM.

 * IORESOURCE_ROM_SHADOW is used to associate the boot video

 * card with this copy. On laptops this copy has to be used since

 * the main ROM may be compressed or combined with another image.

 * See pci_map_rom() for use of this flag. IORESOURCE_ROM_SHADOW

 * is marked here since the boot video device will be the only enabled

 * video device at this point.

 */



static void __devinit fixup_video(struct pci_dev *pdev)

{

	struct pci_dev *bridge;

	struct pci_bus *bus;

	u16 config;



	if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)

		return;



	/* Is VGA routed to us? */

	bus = pdev->bus;

	while (bus) {

		bridge = bus->self;

		if (bridge) {

			pci_read_config_word(bridge, PCI_BRIDGE_CONTROL,

						&config);

			if (!(config & PCI_BRIDGE_CTL_VGA))

				return;

		}

		bus = bus->parent;

	}

	pci_read_config_word(pdev, PCI_COMMAND, &config);

	if (config & (PCI_COMMAND_IO | PCI_COMMAND_MEMORY)) {

		pdev->resource[PCI_ROM_RESOURCE].flags |= IORESOURCE_ROM_SHADOW;

		printk(KERN_DEBUG "Boot video device is %s\n", pci_name(pdev));

	}

}

DECLARE_PCI_FIXUP_HEADER(PCI_ANY_ID, PCI_ANY_ID, fixup_video);





static void pci_do_fixups(struct pci_dev *dev, struct pci_fixup *f, struct pci_fixup *end)

{

drivers/pci/rom.c

+4 −1
Original line number Diff line number Diff line
@@ -71,7 +71,10 @@ void __iomem *pci_map_rom(struct pci_dev *pdev, size_t *size) 
	void __iomem *image;

	int last_image;



	/* IORESOURCE_ROM_SHADOW only set on x86 */

	/*

	 * IORESOURCE_ROM_SHADOW set if the VGA enable bit of the Bridge Control

	 * register is set for embedded VGA.

	 */

	if (res->flags & IORESOURCE_ROM_SHADOW) {

		/* primary video rom always starts here */

		start = (loff_t)0xC0000;

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