[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RFC 2/8] xen/arm: implement read[bl] and write[bl]
These are used in common driver code (specifically ns16550) Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx> --- xen/include/asm-arm/io.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) diff --git a/xen/include/asm-arm/io.h b/xen/include/asm-arm/io.h index aea5233..170263f 100644 --- a/xen/include/asm-arm/io.h +++ b/xen/include/asm-arm/io.h @@ -1,6 +1,54 @@ #ifndef _ASM_IO_H #define _ASM_IO_H +static inline void __raw_writeb(u8 val, volatile void __iomem *addr) +{ + asm volatile("strb %1, %0" + : "+Qo" (*(volatile u8 __force *)addr) + : "r" (val)); +} + +static inline void __raw_writel(u32 val, volatile void __iomem *addr) +{ + asm volatile("str %1, %0" + : "+Qo" (*(volatile u32 __force *)addr) + : "r" (val)); +} + +static inline u8 __raw_readb(const volatile void __iomem *addr) +{ + u8 val; + asm volatile("ldrb %1, %0" + : "+Qo" (*(volatile u8 __force *)addr), + "=r" (val)); + return val; +} + +static inline u32 __raw_readl(const volatile void __iomem *addr) +{ + u32 val; + asm volatile("ldr %1, %0" + : "+Qo" (*(volatile u32 __force *)addr), + "=r" (val)); + return val; +} + +#define __iormb() rmb() +#define __iowmb() wmb() + +#define readb_relaxed(c) ({ u8 __r = __raw_readb(c); __r; }) +#define readl_relaxed(c) ({ u32 __r = le32_to_cpu((__force __le32) \ + __raw_readl(c)); __r; }) + +#define writeb_relaxed(v,c) __raw_writeb(v,c) +#define writel_relaxed(v,c) __raw_writel((__force u32) cpu_to_le32(v),c) + +#define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(); __v; }) +#define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(); __v; }) + +#define writeb(v,c) ({ __iowmb(); writeb_relaxed(v,c); }) +#define writel(v,c) ({ __iowmb(); writel_relaxed(v,c); }) + #endif /* * Local variables: -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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