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asm-generic: io: implement relaxed accessor macros as conditional wrappers
{read,write}{b,w,l,q}_relaxed are implemented by some architectures in order to permit memory-mapped I/O accesses with weaker barrier semantics than the non-relaxed variants. This patch adds wrappers to asm-generic so that drivers can rely on the relaxed accessors being available, even if they don't always provide weaker ordering guarantees. Since some architectures both include asm-generic/io.h and define some relaxed accessors, the definitions here are conditional for the time being. Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Will Deacon <will.deacon@arm.com>
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@ -53,18 +53,27 @@ static inline u32 __raw_readl(const volatile void __iomem *addr)
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#endif
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#define readb __raw_readb
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#ifndef readb_relaxed
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#define readb_relaxed readb
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#endif
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#define readw readw
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static inline u16 readw(const volatile void __iomem *addr)
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{
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return __le16_to_cpu(__raw_readw(addr));
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}
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#ifndef readw_relaxed
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#define readw_relaxed readw
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#endif
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#define readl readl
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static inline u32 readl(const volatile void __iomem *addr)
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{
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return __le32_to_cpu(__raw_readl(addr));
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}
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#ifndef readl_relaxed
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#define readl_relaxed readl
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#endif
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#ifndef __raw_writeb
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static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
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@ -88,8 +97,19 @@ static inline void __raw_writel(u32 b, volatile void __iomem *addr)
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#endif
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#define writeb __raw_writeb
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#ifndef writeb_relaxed
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#define writeb_relaxed writeb
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#endif
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#define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
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#ifndef writew_relaxed
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#define writew_relaxed writew
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#endif
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#define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
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#ifndef writel_relaxed
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#define writel_relaxed writel
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#endif
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#ifdef CONFIG_64BIT
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#ifndef __raw_readq
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@ -104,6 +124,9 @@ static inline u64 readq(const volatile void __iomem *addr)
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{
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return __le64_to_cpu(__raw_readq(addr));
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}
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#ifndef readq_relaxed
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#define readq_relaxed readq
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#endif
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#ifndef __raw_writeq
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static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
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@ -113,6 +136,9 @@ static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
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#endif
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#define writeq(b, addr) __raw_writeq(__cpu_to_le64(b), addr)
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#ifndef writeq_relaxed
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#define writeq_relaxed writeq
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#endif
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#endif /* CONFIG_64BIT */
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#ifndef PCI_IOBASE
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