[POWERPC] Add function to check if address is an IO port
This adds a function that tells you if a given kernel virtual address
is hitting a PCI or ISA IO port permanent mapping or not. This is to
be used in the next patch to fix iomap APIs to properly unmap things.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index fe7d125..74a8fd4 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -101,6 +101,29 @@
kfree(phb);
}
+int pcibios_vaddr_is_ioport(void __iomem *address)
+{
+ int ret = 0;
+ struct pci_controller *hose;
+ unsigned long size;
+
+ spin_lock(&hose_spinlock);
+ list_for_each_entry(hose, &hose_list, list_node) {
+#ifdef CONFIG_PPC64
+ size = hose->pci_io_size;
+#else
+ size = hose->io_resource.end - hose->io_resource.start + 1;
+#endif
+ if (address >= hose->io_base_virt &&
+ address < (hose->io_base_virt + size)) {
+ ret = 1;
+ break;
+ }
+ }
+ spin_unlock(&hose_spinlock);
+ return ret;
+}
+
/*
* Return the domain number for this bus.
*/