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Commit 7ddfe625 authored by Russell King's avatar Russell King
Browse files

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



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: default avatarNicolas Pitre <nico@linaro.org>
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent 7d485f64

arch/arm/include/asm/io.h

+25 −0
Original line number Original line Diff line number Diff line
@@ -23,6 +23,7 @@ 




#ifdef __KERNEL__

#ifdef __KERNEL__





#include <linux/string.h>

#include <linux/types.h>

#include <linux/types.h>

#include <linux/blk_types.h>

#include <linux/blk_types.h>

#include <asm/byteorder.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 writesw(p,d,l)		__raw_writesw(p,d,l)

#define writesl(p,d,l)		__raw_writesl(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 memset_io(c,v,l)	_memset_io(c,(v),(l))

#define memcpy_fromio(a,c,l)	_memcpy_fromio((a),c,(l))

#define memcpy_fromio(a,c,l)	_memcpy_fromio((a),c,(l))

#define memcpy_toio(c,a,l)	_memcpy_toio(c,(a),(l))

#define memcpy_toio(c,a,l)	_memcpy_toio(c,(a),(l))

#endif





#endif	/* readl */

#endif	/* readl */