[PATCH 01/15] ARM: Add fixed PCI i/o mapping

On Friday 06 July 2012, Rob Herring wrote:

 /*
+ * Setup fixed I/O mapping. Must be called from .map_io function.
+ */
+#ifdef CONFIG_PCI
+extern void pci_map_io_pfn(unsigned long pfn[], int nr, int size);
+#else
+static inline void pci_map_io_pfn(unsigned long pfn[], int nr, int size) {}
+#endif
+static inline void __init pci_map_io_single_pfn(unsigned long pfn)
+{
+       pci_map_io_pfn(&pfn, 1, SZ_1M);
+}
+
+static inline void __init pci_map_io_single(unsigned long paddr)
+{
+       pci_map_io_single_pfn(__phys_to_pfn(paddr));
+}

On powerpc, we have a special flag that gets used to register a "primary"
I/O space, which is the one that holds the port numbers between 0 and 1024
because that is the only place that an ISA add-on card can be used in.

I wonder if we want to support that as well, or if we just assume that
the first one to get registered is the primary bus.

	Arnd