[PATCH 2.6.18] IA64: Add pci_fixup_video into IA64 kernel for embedded VGA

[<eiichiro.oiwa.nm@hitachi.com>]

To be compatible with Xorg's handling of PCI, we need pci_fixup_video on IA64
platform like x86 platform. There are also machines, which have VGA embedded
into main board, among IA64 platform. Embedded VGA generally don't have PCI ROM,
and there are VGA ROM image in System BIOS. Therefore, these machines need
pci_fixup_video for the sysfs rom. pci_fixup_video already exists in x86 Linux
kernel. However since this function doesn't exist in IA64 kernel, we could not
run X server on IA64 box has embedded-VGA.

I tested pci_fixup_video on IA64 box has embedded-VGA. I confirmed we can read
VGA BIOS from the sysfs rom regardless of embedded-VGA.

Signed-off-by: Eiichiro Oiwa <eiichiro.oiwa.nm@hitachi.com>
---

diff -dupNr linux-2.6.18.orig/arch/ia64/pci/Makefile linux-2.6.18/arch/ia64/pci/Makefile
--- linux-2.6.18.orig/arch/ia64/pci/Makefile	2006-09-20 12:42:06.000000000 +0900
+++ linux-2.6.18/arch/ia64/pci/Makefile	2006-09-25 18:36:50.000000000 +0900
@@ -1,4 +1,4 @@
 #
 # Makefile for the ia64-specific parts of the pci bus
 #
-obj-y		:= pci.o
+obj-y		:= pci.o fixup.o
diff -dupNr linux-2.6.18.orig/arch/ia64/pci/fixup.c linux-2.6.18/arch/ia64/pci/fixup.c
--- linux-2.6.18.orig/arch/ia64/pci/fixup.c	1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6.18/arch/ia64/pci/fixup.c	2006-09-25 18:35:12.000000000 +0900
@@ -0,0 +1,56 @@
+/*
+ * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
+ *
+ * Derived from fixup.c of i386 tree.
+ */
+
+#include <linux/delay.h>
+#include <linux/dmi.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+
+
+/*
+ * 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);

-
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