diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/dma/ti-edma3.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/dma/ti-edma3.c b/drivers/dma/ti-edma3.c index ec3dc62d2f..53dc4e8ce5 100644 --- a/drivers/dma/ti-edma3.c +++ b/drivers/dma/ti-edma3.c @@ -13,6 +13,7 @@ #include <common.h> #include <dm.h> #include <dma-uclass.h> +#include <linux/dma-mapping.h> #include <asm/omap_common.h> #include <asm/ti-common/ti-edma3.h> @@ -487,8 +488,10 @@ void __edma3_fill(unsigned long edma3_base_addr, unsigned int edma_slot_num, { int xfer_len; int max_xfer = EDMA_FILL_BUFFER_SIZE * 65535; + dma_addr_t source; memset((void *)edma_fill_buffer, val, sizeof(edma_fill_buffer)); + source = dma_map_single(edma_fill_buffer, len, DMA_TO_DEVICE); while (len) { xfer_len = len; @@ -501,6 +504,8 @@ void __edma3_fill(unsigned long edma3_base_addr, unsigned int edma_slot_num, len -= xfer_len; dst += xfer_len; } + + dma_unmap_single(source, len, DMA_FROM_DEVICE); } #ifndef CONFIG_DMA @@ -508,13 +513,27 @@ void __edma3_fill(unsigned long edma3_base_addr, unsigned int edma_slot_num, void edma3_transfer(unsigned long edma3_base_addr, unsigned int edma_slot_num, void *dst, void *src, size_t len) { + /* Clean the areas, so no writeback into the RAM races with DMA */ + dma_addr_t destination = dma_map_single(dst, len, DMA_FROM_DEVICE); + dma_addr_t source = dma_map_single(src, len, DMA_TO_DEVICE); + __edma3_transfer(edma3_base_addr, edma_slot_num, dst, src, len, len); + + /* Clean+Invalidate the areas after, so we can see DMA'd data */ + dma_unmap_single(destination, len, DMA_FROM_DEVICE); + dma_unmap_single(source, len, DMA_TO_DEVICE); } void edma3_fill(unsigned long edma3_base_addr, unsigned int edma_slot_num, void *dst, u8 val, size_t len) { + /* Clean the area, so no writeback into the RAM races with DMA */ + dma_addr_t destination = dma_map_single(dst, len, DMA_FROM_DEVICE); + __edma3_fill(edma3_base_addr, edma_slot_num, dst, val, len); + + /* Clean+Invalidate the area after, so we can see DMA'd data */ + dma_unmap_single(destination, len, DMA_FROM_DEVICE); } #else |