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authorDavid Woodhouse <dwmw2@infradead.org>2006-12-01 09:56:43 +0000
committerDavid Woodhouse <dwmw2@infradead.org>2006-12-01 09:56:43 +0000
commitbd3c97a7c718bfb9f1e4f31c16c383a5c6f815eb (patch)
tree3f56594e813c6f35cbacbdb3e137ba5bfd0b3069 /arch/ia64/pci
parent6c33cafc794d07c9254c160789120a0e98c088c9 (diff)
parent0215ffb08ce99e2bb59eca114a99499a4d06e704 (diff)
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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'arch/ia64/pci')
-rw-r--r--arch/ia64/pci/Makefile2
-rw-r--r--arch/ia64/pci/fixup.c69
2 files changed, 70 insertions, 1 deletions
diff --git a/arch/ia64/pci/Makefile b/arch/ia64/pci/Makefile
index e66889e..fb14dc5 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 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);