This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / arch / ia64 / pci / fixup.c

diff --git a/arch/ia64/pci/fixup.c b/arch/ia64/pci/fixup.c
new file mode 100644 (file)
index 0000000..245dc1f
--- /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);