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alpha: io: implement relaxed accessor macros for writes

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write{b,w,l,q}_relaxed are implemented by some architectures in order to
permit memory-mapped I/O writes with weaker barrier semantics than the
non-relaxed variants.

This patch implements these write macros for Alpha, in the same vein as
the relaxed read macros, which are already implemented.

Acked-by: Richard Henderson <[email protected]>
Cc: Ivan Kokshaysky <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Matt Turner <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Will Deacon 2014-07-24 17:53:54 -07:00 • committed by Linus Torvalds
commit 9e36c63395
1 changed files with 8 additions and 4 deletions
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12
arch/alpha/include/asm/io.h
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@ -500,10 +500,14 @@ extern inline void writeq(u64 b, volatile void __iomem *addr)
#define outb_p outb
#define outw_p outw
#define outl_p outl
#define readb_relaxed(addr) __raw_readb(addr)
#define readw_relaxed(addr) __raw_readw(addr)
#define readl_relaxed(addr) __raw_readl(addr)
#define readq_relaxed(addr) __raw_readq(addr)
#define readb_relaxed(addr) __raw_readb(addr)
#define readw_relaxed(addr) __raw_readw(addr)
#define readl_relaxed(addr) __raw_readl(addr)
#define readq_relaxed(addr) __raw_readq(addr)
#define writeb_relaxed(b, addr) __raw_writeb(b, addr)
#define writew_relaxed(b, addr) __raw_writew(b, addr)
#define writel_relaxed(b, addr) __raw_writel(b, addr)
#define writeq_relaxed(b, addr) __raw_writeq(b, addr)
#define mmiowb()