[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.
*/
diff --git a/include/asm-powerpc/pci-bridge.h b/include/asm-powerpc/pci-bridge.h
index d53e0eb..e909769 100644
--- a/include/asm-powerpc/pci-bridge.h
+++ b/include/asm-powerpc/pci-bridge.h
@@ -71,6 +71,14 @@
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 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 @@
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
