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blackfin: limit the max memory dma peripheral transfer size to 4 bytes. 

Othersize, the bf609 memory dma halts after being enabled.

Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
This commit is contained in:
Sonic Zhang 2012-12-11 16:51:23 +08:00
parent 1cd9158eb4
commit c4239b5341
1 changed files with 6 additions and 3 deletions
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9
arch/blackfin/lib/string.c
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@ -128,10 +128,12 @@ static void dma_calc_size(unsigned long ldst, unsigned long lsrc, size_t count,
unsigned long limit;
#ifdef MSIZE
limit = 6;
/* The max memory DMA memory transfer size is 32 bytes. */
limit = 5;
*dshift = MSIZE_P;
#else
limit = 3;
/* The max memory DMA memory transfer size is 4 bytes. */
limit = 2;
*dshift = WDSIZE_P;
#endif
@ -170,7 +172,8 @@ void dma_memcpy_nocache(void *dst, const void *src, size_t count)
mod = 1 << bpos;
#ifdef PSIZE
dsize |= min(3, bpos) << PSIZE_P;
/* The max memory DMA peripheral transfer size is 4 bytes. */
dsize |= min(2, bpos) << PSIZE_P;
#endif
/* Copy sram functions from sdram to sram */