sh: Provide uncached I/O helpers. (b8f7918f) · Commits · 戴 / test

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>

arch/sh/include/asm/io.h

+22 −0

Original line number	Diff line number	Diff line
		@@ -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, \

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