[PCI] pci-8: pci_resource_to_bus()

Convert pcibios_fixup_pbus_ranges() into something more generic, namely
pcibios_resource_to_bus() - we are really trying to convert resources
to something to program into bus registers for bridge windows, and in
fact, PCI device BARs.

This is necessary since some architectures, namely Alpha, ARM and PARISC
have an offset between PCI addressing and host-based addressing, so
resources need to be adjusted when read or when written back to the bus.

We provide a generic version in asm-generic/pci.h, which most
architectures use.

This patch finds the following architectures with something to think
consider:

        - ppc, ppc64
                adjusts resources for devices, but not buses.
		This is inconsistent, and leads to improperly
		programmed windows/BARs.

PPC people (Anton) has a replacement PCI resource implementation
which should do the right thing.

1 files changed, 25 insertions, 0 deletions

diff --git a/include/asm-generic/pci.h b/include/asm-generic/pci.h
new file mode 100644
index 000000000000..df757d240e9a
--- /dev/null
+++ b/include/asm-generic/pci.h
@@ -0,0 +1,25 @@
+/*
+ * linux/include/asm-generic/pci.h
+ *
+ *  Copyright (C) 2003 Russell King
+ */
+#ifndef _ASM_GENERIC_PCI_H
+#define _ASM_GENERIC_PCI_H
+
+/**
+ * pcibios_resource_to_bus - convert resource to PCI bus address
+ * @dev: device which owns this resource
+ * @region: converted bus-centric region (start,end)
+ * @res: resource to convert
+ *
+ * Convert a resource to a PCI device bus address or bus window.
+ */
+static inline void
+pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
+			 struct resource *res)
+{
+	region->start = res->start;
+	region->end = res->end;
+}
+
+#endif