diff options
| author | Mike Frysinger <vapier@gentoo.org> | 2008-11-05 12:45:24 -0500 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-02-02 12:24:46 -0500 |
| commit | 961954ea0ec8dc4341034c1a1ff3107ec0527809 (patch) | |
| tree | 1049fc2b76adec6d3f3d8dac8387fada2111127d /lib_blackfin | |
| parent | b93c68648426f906d63b98117496b6415f505f39 (diff) | |
Blackfin: use 8/16/32 bit transfer widths in dma_memcpy()
Rather than using 8bit transfers for everything, use 8/16/32 bit transfers
as usable with the source/destination addresses and the count size.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'lib_blackfin')
| -rw-r--r-- | lib_blackfin/string.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/lib_blackfin/string.c b/lib_blackfin/string.c index e4587184465..12b6d24058c 100644 --- a/lib_blackfin/string.c +++ b/lib_blackfin/string.c @@ -136,6 +136,8 @@ int strncmp(const char *cs, const char *ct, size_t count) */ void dma_memcpy_nocache(void *dst, const void *src, size_t count) { + uint16_t wdsize, mod; + /* Disable DMA in case it's still running (older u-boot's did not * always turn them off). Do it before the if statement below so * we can be cheap and not do a SSYNC() due to the forced abort. @@ -151,24 +153,37 @@ void dma_memcpy_nocache(void *dst, const void *src, size_t count) (unsigned long)dst < L1_SRAM_SCRATCH_END)) hang(); + if (((unsigned long)dst | (unsigned long)src | count) & 0x1) { + wdsize = WDSIZE_8; + mod = 1; + } else if (((unsigned long)dst | (unsigned long)src | count) & 0x2) { + wdsize = WDSIZE_16; + count >>= 1; + mod = 2; + } else { + wdsize = WDSIZE_32; + count >>= 2; + mod = 4; + } + /* Copy sram functions from sdram to sram */ /* Setup destination start address */ bfin_write_MDMA_D0_START_ADDR(dst); /* Setup destination xcount */ bfin_write_MDMA_D0_X_COUNT(count); /* Setup destination xmodify */ - bfin_write_MDMA_D0_X_MODIFY(1); + bfin_write_MDMA_D0_X_MODIFY(mod); /* Setup Source start address */ bfin_write_MDMA_S0_START_ADDR(src); /* Setup Source xcount */ bfin_write_MDMA_S0_X_COUNT(count); /* Setup Source xmodify */ - bfin_write_MDMA_S0_X_MODIFY(1); + bfin_write_MDMA_S0_X_MODIFY(mod); /* Enable source DMA */ - bfin_write_MDMA_S0_CONFIG(DMAEN); - bfin_write_MDMA_D0_CONFIG(WNR | DMAEN | DI_EN); + bfin_write_MDMA_S0_CONFIG(wdsize | DMAEN); + bfin_write_MDMA_D0_CONFIG(wdsize | DMAEN | WNR | DI_EN); SSYNC(); while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE)) |