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_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);