PCI: fix pci_fixup_video as it blows up on sparc64

This reverts much of the original pci_fixup_video change and makes it
work for all arches that need it.

fixed, and tested on x86, x86_64 and IA64 dig.

Signed-off-by: Eiichiro Oiwa <eiichiro.oiwa.nm@hitachi.com>
Acked-by: David Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 70 insertions, 1 deletions

diff --git a/arch/ia64/pci/Makefile b/arch/ia64/pci/Makefile
index e66889e6922a..fb14dc520d2d 100644
--- a/arch/ia64/pci/Makefile
+++ b/arch/ia64/pci/Makefile
@@ -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 --git a/arch/ia64/pci/fixup.c b/arch/ia64/pci/fixup.c
new file mode 100644
index 000000000000..245dc1fedc24
--- /dev/null
+++ b/arch/ia64/pci/fixup.c
@@ -0,0 +1,69 @@
+/*
+ * Exceptions for specific devices. Usually work-arounds for fatal design flaws.
+ * Derived from fixup.c of i386 tree.
+ */
+
+#include <linux/pci.h>
+#include <linux/init.h>
+
+#include <asm/machvec.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 ((strcmp(platform_name, "dig") != 0)
+            && (strcmp(platform_name, "hpzx1")  != 0))
+                return;
+        /* Maybe, this machine supports legacy memory map. */
+
+        if ((pdev->class >> 8) != PCI_CLASS_DISPLAY_VGA)
+                return;
+
+        /* Is VGA routed to us? */
+        bus = pdev->bus;
+        while (bus) {
+                bridge = bus->self;
+
+                /*
+                 * From information provided by
+                 * "David Miller" <davem@davemloft.net>
+                 * The bridge control register is valid for PCI header
+                 * type BRIDGE, or CARDBUS. Host to PCI controllers use
+                 * PCI header type NORMAL.
+                 */
+                if (bridge
+                    &&((bridge->hdr_type == PCI_HEADER_TYPE_BRIDGE)
+                       ||(bridge->hdr_type == PCI_HEADER_TYPE_CARDBUS))) {
+                        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);