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ARM: 6271/1: Introduce *_relaxed() I/O accessors

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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>
This commit is contained in:
Catalin Marinas 2010-07-28 22:00:54 +01:00 committed by Russell King
parent 661f10f6b6
commit e936771a76
1 changed files with 17 additions and 12 deletions
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29
arch/arm/include/asm/io.h
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@ -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)