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| author | Catalin Marinas <catalin.marinas@arm.com> | 2010-07-28 23:00:54 +0200 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-07-29 15:04:36 +0200 |
| commit | e936771a76a7b61ca55a5142a3de835c2e196871 (patch) | |
| tree | 3ec67935283bbd150bbaa2c9847dec525a0eb031 /arch/arm/include/asm/io.h | |
| parent | ARM: 6275/1: ux500: don't use writeb() in uncompress.h (diff) | |
| download | linux-e936771a76a7b61ca55a5142a3de835c2e196871.tar.xz linux-e936771a76a7b61ca55a5142a3de835c2e196871.zip | |
ARM: 6271/1: Introduce *_relaxed() I/O accessors
This patch introduces readl*_relaxed()/write*_relaxed() as the main I/O
accessors (when __mem_pci is defined). The standard read*()/write*()
macros are now based on the relaxed accessors.
This patch is in preparation for a subsequent patch which adds barriers
to the I/O accessors.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/include/asm/io.h')
| -rw-r--r-- | arch/arm/include/asm/io.h | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h index c980156f3263..9db072df2b3d 100644 --- a/arch/arm/include/asm/io.h +++ b/arch/arm/include/asm/io.h @@ -179,25 +179,30 @@ extern void _memset_io(volatile void __iomem *, int, size_t); * IO port primitives for more information. */ #ifdef __mem_pci -#define readb(c) ({ __u8 __v = __raw_readb(__mem_pci(c)); __v; }) -#define readw(c) ({ __u16 __v = le16_to_cpu((__force __le16) \ +#define readb_relaxed(c) ({ u8 __v = __raw_readb(__mem_pci(c)); __v; }) +#define readw_relaxed(c) ({ u16 __v = le16_to_cpu((__force __le16) \ __raw_readw(__mem_pci(c))); __v; }) -#define readl(c) ({ __u32 __v = le32_to_cpu((__force __le32) \ +#define readl_relaxed(c) ({ u32 __v = le32_to_cpu((__force __le32) \ __raw_readl(__mem_pci(c))); __v; }) -#define readb_relaxed(addr) readb(addr) -#define readw_relaxed(addr) readw(addr) -#define readl_relaxed(addr) readl(addr) + +#define writeb_relaxed(v,c) ((void)__raw_writeb(v,__mem_pci(c))) +#define writew_relaxed(v,c) ((void)__raw_writew((__force u16) \ + cpu_to_le16(v),__mem_pci(c))) +#define writel_relaxed(v,c) ((void)__raw_writel((__force u32) \ + cpu_to_le32(v),__mem_pci(c))) + +#define readb(c) readb_relaxed(c) +#define readw(c) readw_relaxed(c) +#define readl(c) readl_relaxed(c) + +#define writeb(v,c) writeb_relaxed(v,c) +#define writew(v,c) writew_relaxed(v,c) +#define writel(v,c) writel_relaxed(v,c) #define readsb(p,d,l) __raw_readsb(__mem_pci(p),d,l) #define readsw(p,d,l) __raw_readsw(__mem_pci(p),d,l) #define readsl(p,d,l) __raw_readsl(__mem_pci(p),d,l) -#define writeb(v,c) __raw_writeb(v,__mem_pci(c)) -#define writew(v,c) __raw_writew((__force __u16) \ - cpu_to_le16(v),__mem_pci(c)) -#define writel(v,c) __raw_writel((__force __u32) \ - cpu_to_le32(v),__mem_pci(c)) - #define writesb(p,d,l) __raw_writesb(__mem_pci(p),d,l) #define writesw(p,d,l) __raw_writesw(__mem_pci(p),d,l) #define writesl(p,d,l) __raw_writesl(__mem_pci(p),d,l) |