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/include/asm/io.h b/arch/powerpc/include/asm/io.h
index 2f365f5..662d2ed 100644
--- a/arch/powerpc/include/asm/io.h
+++ b/arch/powerpc/include/asm/io.h
@@ -2,6 +2,8 @@
#define _ASM_POWERPC_IO_H
#ifdef __KERNEL__
+#define ARCH_HAS_IOREMAP_WC
+
/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -628,6 +630,8 @@
*
* * ioremap_nocache is identical to ioremap
*
+ * * ioremap_wc enables write combining
+ *
* * iounmap undoes such a mapping and can be hooked
*
* * __ioremap_at (and the pending __iounmap_at) are low level functions to
@@ -648,6 +652,7 @@
extern void __iomem *ioremap(phys_addr_t address, unsigned long size);
extern void __iomem *ioremap_flags(phys_addr_t address, unsigned long size,
unsigned long flags);
+extern void __iomem *ioremap_wc(phys_addr_t address, unsigned long size);
#define ioremap_nocache(addr, size) ioremap((addr), (size))
#define ioremap_prot(addr, size, prot) ioremap_flags((addr), (size), (prot))