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-rw-r--r--lib_blackfin/string.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/lib_blackfin/string.c b/lib_blackfin/string.c
index 36eecdf..e458718 100644
--- a/lib_blackfin/string.c
+++ b/lib_blackfin/string.c
@@ -136,6 +136,14 @@ int strncmp(const char *cs, const char *ct, size_t count)
*/
void dma_memcpy_nocache(void *dst, const void *src, size_t count)
{
+ /* 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.
+ */
+ bfin_write_MDMA_D0_CONFIG(0);
+ bfin_write_MDMA_S0_CONFIG(0);
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_RUN | DMA_DONE | DMA_ERR);
+
/* Scratchpad cannot be a DMA source or destination */
if (((unsigned long)src >= L1_SRAM_SCRATCH &&
(unsigned long)src < L1_SRAM_SCRATCH_END) ||
@@ -143,10 +151,6 @@ void dma_memcpy_nocache(void *dst, const void *src, size_t count)
(unsigned long)dst < L1_SRAM_SCRATCH_END))
hang();
- bfin_write_MDMA_S0_CONFIG(0);
- bfin_write_MDMA_D0_CONFIG(0);
- bfin_write_MDMA_D0_IRQ_STATUS(DMA_RUN | DMA_DONE | DMA_ERR);
-
/* Copy sram functions from sdram to sram */
/* Setup destination start address */
bfin_write_MDMA_D0_START_ADDR(dst);
@@ -164,14 +168,13 @@ void dma_memcpy_nocache(void *dst, const void *src, size_t count)
/* Enable source DMA */
bfin_write_MDMA_S0_CONFIG(DMAEN);
-
- bfin_write_MDMA_D0_CONFIG(WNR | DMAEN);
+ bfin_write_MDMA_D0_CONFIG(WNR | DMAEN | DI_EN);
SSYNC();
- while (bfin_read_MDMA_D0_IRQ_STATUS() & DMA_RUN)
+ while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE))
continue;
- bfin_write_MDMA_D0_IRQ_STATUS(bfin_read_MDMA_D0_IRQ_STATUS() | DMA_RUN | DMA_DONE | DMA_ERR);
+ bfin_write_MDMA_D0_IRQ_STATUS(DMA_RUN | DMA_DONE | DMA_ERR);
bfin_write_MDMA_D0_CONFIG(0);
bfin_write_MDMA_S0_CONFIG(0);
}