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powerpc: tiny memcpy_(to|from)io optimisation
This trivial patch changes memcpy_(to|from)io as to transfer as many 32-bit words as possible in 32-bit accesses (in the current solution, the last 32-bit word was transferred as 4 byte accesses). Signed-off-by: Albrecht Dreß <albrecht.dress@arcor.de> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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1 changed files with 2 additions and 2 deletions
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@ -161,7 +161,7 @@ void _memcpy_fromio(void *dest, const volatile void __iomem *src,
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dest++;
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n--;
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}
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while(n > 4) {
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while(n >= 4) {
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*((u32 *)dest) = *((volatile u32 *)vsrc);
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eieio();
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vsrc += 4;
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@ -190,7 +190,7 @@ void _memcpy_toio(volatile void __iomem *dest, const void *src, unsigned long n)
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vdest++;
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n--;
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}
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while(n > 4) {
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while(n >= 4) {
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*((volatile u32 *)vdest) = *((volatile u32 *)src);
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src += 4;
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vdest += 4;
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