[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>

2 files changed, 43 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index fe7d1255e11e..74a8fd450f67 100644
--- a/arch/powerpc/kernel/pci-common.c
+++ b/arch/powerpc/kernel/pci-common.c
@@ -101,6 +101,29 @@ void pcibios_free_controller(struct pci_controller *phb)
                 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.
  */
diff --git a/include/asm-powerpc/pci-bridge.h b/include/asm-powerpc/pci-bridge.h
index d53e0eb1de16..e909769b6410 100644
--- a/include/asm-powerpc/pci-bridge.h
+++ b/include/asm-powerpc/pci-bridge.h
@@ -71,6 +71,14 @@ static inline struct pci_controller *pci_bus_to_host(struct pci_bus *bus)
         return bus->sysdata;
 }
 
+static inline int isa_vaddr_is_ioport(void __iomem *address)
+{
+        /* No specific ISA handling on ppc32 at this stage, it
+         * all goes through PCI
+         */
+        return 0;
+}
+
 /* These are used for config access before all the PCI probing
    has been done. */
 int early_read_config_byte(struct pci_controller *hose, int bus, int dev_fn,
@@ -241,6 +249,13 @@ extern void pcibios_free_controller(struct pci_controller *phb);
 
 extern void isa_bridge_find_early(struct pci_controller *hose);
 
+static inline int isa_vaddr_is_ioport(void __iomem *address)
+{
+        /* Check if address hits the reserved legacy IO range */
+        unsigned long ea = (unsigned long)address;
+        return ea >= ISA_IO_BASE && ea < ISA_IO_END;
+}
+
 extern int pcibios_unmap_io_space(struct pci_bus *bus);
 extern int pcibios_map_io_space(struct pci_bus *bus);
 
@@ -271,11 +286,16 @@ extern struct pci_controller *
 pcibios_alloc_controller(struct device_node *dev);
 #ifdef CONFIG_PCI
 extern unsigned long pci_address_to_pio(phys_addr_t address);
+extern int pcibios_vaddr_is_ioport(void __iomem *address);
 #else
 static inline unsigned long pci_address_to_pio(phys_addr_t address)
 {
         return (unsigned long)-1;
 }
+static inline int pcibios_vaddr_is_ioport(void __iomem *address)
+{
+        return 0;
+}
 #endif