From c8e6603d0c8d0fb39bcb63d01df80494607b5ba3 Mon Sep 17 00:00:00 2001 From: Sascha Hauer Date: Tue, 13 Mar 2018 13:04:37 +0100 Subject: dma: Add prototypes for dma mapping functions Right now we only have the dma_sync_single_* functions, but no functions for actually mapping a pointer. The mapping functions become necessary when casting a pointer to unsigned long to get a dma address is not enough. (I'm not even going so far that we'll add IOMMU support, but on some architectures we need a place where we can check if a pointer is DMA mappable at all) Signed-off-by: Sascha Hauer --- include/dma.h | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'include/dma.h') diff --git a/include/dma.h b/include/dma.h index 29d94c0a52..5fdcb1733c 100644 --- a/include/dma.h +++ b/include/dma.h @@ -30,6 +30,18 @@ static inline void dma_free(void *mem) } #endif +dma_addr_t dma_map_single(struct device_d *dev, void *ptr, size_t size, + enum dma_data_direction dir); +void dma_unmap_single(struct device_d *dev, dma_addr_t addr, size_t size, + enum dma_data_direction dir); + +#define DMA_ERROR_CODE (~(dma_addr_t)0) + +static inline int dma_mapping_error(struct device_d *dev, dma_addr_t dma_addr) +{ + return dma_addr == DMA_ERROR_CODE; +} + /* streaming DMA - implement the below calls to support HAS_DMA */ void dma_sync_single_for_cpu(dma_addr_t address, size_t size, enum dma_data_direction dir); -- cgit v1.2.3