powerpc: Add ioremap_wc
Add ioremap_wc so drivers can request write combining on kernel
mappings.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/mm/pgtable_32.c b/arch/powerpc/mm/pgtable_32.c
index 8dc41c0..fca98f8 100644
--- a/arch/powerpc/mm/pgtable_32.c
+++ b/arch/powerpc/mm/pgtable_32.c
@@ -133,6 +133,14 @@
EXPORT_SYMBOL(ioremap);
void __iomem *
+ioremap_wc(phys_addr_t addr, unsigned long size)
+{
+ return __ioremap_caller(addr, size, _PAGE_NO_CACHE,
+ __builtin_return_address(0));
+}
+EXPORT_SYMBOL(ioremap_wc);
+
+void __iomem *
ioremap_flags(phys_addr_t addr, unsigned long size, unsigned long flags)
{
/* writeable implies dirty for kernel addresses */
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 88927a0..1146fc6 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -255,6 +255,16 @@
return __ioremap_caller(addr, size, flags, caller);
}
+void __iomem * ioremap_wc(phys_addr_t addr, unsigned long size)
+{
+ unsigned long flags = _PAGE_NO_CACHE;
+ void *caller = __builtin_return_address(0);
+
+ if (ppc_md.ioremap)
+ return ppc_md.ioremap(addr, size, flags, caller);
+ return __ioremap_caller(addr, size, flags, caller);
+}
+
void __iomem * ioremap_flags(phys_addr_t addr, unsigned long size,
unsigned long flags)
{
@@ -311,6 +321,7 @@
}
EXPORT_SYMBOL(ioremap);
+EXPORT_SYMBOL(ioremap_wc);
EXPORT_SYMBOL(ioremap_flags);
EXPORT_SYMBOL(__ioremap);
EXPORT_SYMBOL(__ioremap_at);