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ARM: optimize memset_io()/memcpy_fromio()/memcpy_toio()

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If we are building for a LE platform, and we haven't overriden the
MMIO ops, then we can optimize the mem*io operations using the
standard string functions.

Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2015-05-07 14:22:40 +01:00
parent 7d485f647c
commit 7ddfe625cb
1 changed files with 25 additions and 0 deletions
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25
arch/arm/include/asm/io.h
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@ -23,6 +23,7 @@
#ifdef __KERNEL__
#include <linux/string.h>
#include <linux/types.h>
#include <linux/blk_types.h>
#include <asm/byteorder.h>
@ -316,9 +317,33 @@ extern void _memset_io(volatile void __iomem *, int, size_t);
#define writesw(p,d,l) __raw_writesw(p,d,l)
#define writesl(p,d,l) __raw_writesl(p,d,l)
#ifndef __ARMBE__
static inline void memset_io(volatile void __iomem *dst, unsigned c,
size_t count)
{
memset((void __force *)dst, c, count);
}
#define memset_io(dst,c,count) memset_io(dst,c,count)
static inline void memcpy_fromio(void *to, const volatile void __iomem *from,
size_t count)
{
memcpy(to, (const void __force *)from, count);
}
#define memcpy_fromio(to,from,count) memcpy_fromio(to,from,count)
static inline void memcpy_toio(volatile void __iomem *to, const void *from,
size_t count)
{
memcpy((void __force *)to, from, count);
}
#define memcpy_toio(to,from,count) memcpy_toio(to,from,count)
#else
#define memset_io(c,v,l) _memset_io(c,(v),(l))
#define memcpy_fromio(a,c,l) _memcpy_fromio((a),c,(l))
#define memcpy_toio(c,a,l) _memcpy_toio(c,(a),(l))
#endif
#endif /* readl */