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authorRobin Murphy <robin.murphy@arm.com>2016-04-26 11:38:20 +0100
committerWill Deacon <will.deacon@arm.com>2016-05-03 18:23:02 +0100
commite511267bc25e18926826e7cccdf7872bcbb4776a (patch)
treeae8d3be2bee8b89cfaa309a88ebd229f76b5f95c /include/asm-generic/io.h
parentf0cfffc48cac516e37711786227f6808491913a5 (diff)
io-64-nonatomic: Add relaxed accessor variants
Whilst commit 9439eb3ab9d1 ("asm-generic: io: implement relaxed accessor macros as conditional wrappers") makes the *_relaxed forms of I/O accessors universally available to drivers, in cases where writeq() is implemented via the io-64-nonatomic helpers, writeq_relaxed() will end up falling back to writel() regardless of whether writel_relaxed() is available (identically for s/write/read/). Add corresponding relaxed forms of the nonatomic helpers to delegate to the equivalent 32-bit accessors as appropriate. We also need to fix io.h to avoid defining default relaxed variants if the basic accessors themselves don't exist. CC: Christoph Hellwig <hch@lst.de> CC: Darren Hart <dvhart@linux.intel.com> CC: Hitoshi Mitake <mitake.hitoshi@lab.ntt.co.jp> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'include/asm-generic/io.h')
-rw-r--r--include/asm-generic/io.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index eed3bbe88c8a..002b81f6f2bc 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -191,7 +191,7 @@ static inline void writeq(u64 value, volatile void __iomem *addr)
#define readl_relaxed readl
#endif
-#ifndef readq_relaxed
+#if defined(readq) && !defined(readq_relaxed)
#define readq_relaxed readq
#endif
@@ -207,7 +207,7 @@ static inline void writeq(u64 value, volatile void __iomem *addr)
#define writel_relaxed writel
#endif
-#ifndef writeq_relaxed
+#if defined(writeq) && !defined(writeq_relaxed)
#define writeq_relaxed writeq
#endif