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authorPaul Mundt <lethal@linux-sh.org>2010-02-18 13:23:30 +0900
committerPaul Mundt <lethal@linux-sh.org>2010-02-18 13:23:30 +0900
commitb8f7918f332873a79e4c820e90e7a245ce4d3042 (patch)
tree646ba9c3abeb7919c0346cfb6c6222e76196204d /arch/sh/include/asm/io.h
parentd53a0d33bc3a50ea0e8dd1680a2e8435770b162a (diff)
downloadlinux-b8f7918f332873a79e4c820e90e7a245ce4d3042.tar.bz2
sh: Provide uncached I/O helpers.
There are lots of registers that can only be updated from the uncached mapping, so we add some helpers for those cases in order to make it easier to ensure that we only make the jump when it's absolutely necessary. Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'arch/sh/include/asm/io.h')
-rw-r--r--arch/sh/include/asm/io.h22
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/sh/include/asm/io.h b/arch/sh/include/asm/io.h
index bd5fafa23eb4..7dab7b23a5ec 100644
--- a/arch/sh/include/asm/io.h
+++ b/arch/sh/include/asm/io.h
@@ -133,6 +133,28 @@ static inline void ctrl_delay(void)
__raw_readw(generic_io_base);
}
+#define __BUILD_UNCACHED_IO(bwlq, type) \
+static inline type read##bwlq##_uncached(unsigned long addr) \
+{ \
+ type ret; \
+ jump_to_uncached(); \
+ ret = __raw_read##bwlq(addr); \
+ back_to_cached(); \
+ return ret; \
+} \
+ \
+static inline void write##bwlq##_uncached(type v, unsigned long addr) \
+{ \
+ jump_to_uncached(); \
+ __raw_write##bwlq(v, addr); \
+ back_to_cached(); \
+}
+
+__BUILD_UNCACHED_IO(b, u8)
+__BUILD_UNCACHED_IO(w, u16)
+__BUILD_UNCACHED_IO(l, u32)
+__BUILD_UNCACHED_IO(q, u64)
+
#define __BUILD_MEMORY_STRING(bwlq, type) \
\
static inline void __raw_writes##bwlq(volatile void __iomem *mem, \