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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-07-29 11:38:05 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-07-29 14:04:37 +0100 |
| commit | b92b3612134faff171981fad4f0adb33f485e02e (patch) | |
| tree | 90e686709e31ab7523e4ce730b2c85a930384cf7 /arch | |
| parent | 79f64dbf68c8a9779a7e9a25e0a9f0217a25b57a (diff) | |
| download | linux-b92b3612134faff171981fad4f0adb33f485e02e.tar.bz2 | |
ARM: Add barriers to io{read,write}{8,16,32} accessors as well
The ioread/iowrite accessors also need barriers as they're used in
place of readl/writel et.al. in portable drivers. Create __iormb()
and __iowmb() which are conditionally defined to be barriers dependent
on ARM_DMA_MEM_BUFFERABLE, and always use these macros in the accessors.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/include/asm/io.h | 38 |
1 files changed, 18 insertions, 20 deletions
diff --git a/arch/arm/include/asm/io.h b/arch/arm/include/asm/io.h index 3c91e7c80c29..1261b1f928d9 100644 --- a/arch/arm/include/asm/io.h +++ b/arch/arm/include/asm/io.h @@ -193,23 +193,21 @@ extern void _memset_io(volatile void __iomem *, int, size_t); cpu_to_le32(v),__mem_pci(c))) #ifdef CONFIG_ARM_DMA_MEM_BUFFERABLE -#define readb(c) ({ u8 __v = readb_relaxed(c); rmb(); __v; }) -#define readw(c) ({ u16 __v = readw_relaxed(c); rmb(); __v; }) -#define readl(c) ({ u32 __v = readl_relaxed(c); rmb(); __v; }) - -#define writeb(v,c) ({ wmb(); writeb_relaxed(v,c); }) -#define writew(v,c) ({ wmb(); writew_relaxed(v,c); }) -#define writel(v,c) ({ wmb(); writel_relaxed(v,c); }) +#define __iormb() rmb() +#define __iowmb() wmb() #else -#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 __iormb() do { } while (0) +#define __iowmb() do { } while (0) #endif +#define readb(c) ({ u8 __v = readb_relaxed(c); __iormb(); __v; }) +#define readw(c) ({ u16 __v = readw_relaxed(c); __iormb(); __v; }) +#define readl(c) ({ u32 __v = readl_relaxed(c); __iormb(); __v; }) + +#define writeb(v,c) ({ __iowmb(); writeb_relaxed(v,c); }) +#define writew(v,c) ({ __iowmb(); writew_relaxed(v,c); }) +#define writel(v,c) ({ __iowmb(); 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) @@ -260,13 +258,13 @@ extern void _memset_io(volatile void __iomem *, int, size_t); * io{read,write}{8,16,32} macros */ #ifndef ioread8 -#define ioread8(p) ({ unsigned int __v = __raw_readb(p); __v; }) -#define ioread16(p) ({ unsigned int __v = le16_to_cpu((__force __le16)__raw_readw(p)); __v; }) -#define ioread32(p) ({ unsigned int __v = le32_to_cpu((__force __le32)__raw_readl(p)); __v; }) +#define ioread8(p) ({ unsigned int __v = __raw_readb(p); __iormb(); __v; }) +#define ioread16(p) ({ unsigned int __v = le16_to_cpu((__force __le16)__raw_readw(p)); __iormb(); __v; }) +#define ioread32(p) ({ unsigned int __v = le32_to_cpu((__force __le32)__raw_readl(p)); __iormb(); __v; }) -#define iowrite8(v,p) __raw_writeb(v, p) -#define iowrite16(v,p) __raw_writew((__force __u16)cpu_to_le16(v), p) -#define iowrite32(v,p) __raw_writel((__force __u32)cpu_to_le32(v), p) +#define iowrite8(v,p) ({ __iowmb(); (void)__raw_writeb(v, p); }) +#define iowrite16(v,p) ({ __iowmb(); (void)__raw_writew((__force __u16)cpu_to_le16(v), p); }) +#define iowrite32(v,p) ({ __iowmb(); (void)__raw_writel((__force __u32)cpu_to_le32(v), p); }) #define ioread8_rep(p,d,c) __raw_readsb(p,d,c) #define ioread16_rep(p,d,c) __raw_readsw(p,d,c) |