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dmaengine: xilinx_dma: Introduce helper macro for preparing dma address 

This patch introduces the xilinx_prep_dma_addr_t macro which prepares
dma_addr_t from hardware buffer descriptor LSB and MSB fields. It will
be used in simple dma 64-bit programming sequence.

Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Reviewed-by: Appana Durga Kedareswara Rao <appana.durga.rao@xilinx.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Radhey Shyam Pandey 2018-09-29 11:17:59 -06:00 committed by Vinod Koul
parent 91b438286e
commit 4e47d24a90
1 changed files with 2 additions and 0 deletions
drivers/dma/xilinx
xilinx_dma.c

2
drivers/dma/xilinx/xilinx_dma.c
View File

@ -190,6 +190,8 @@
/* AXI CDMA Specific Masks */ /* AXI CDMA Specific Masks */
#define XILINX_CDMA_CR_SGMODE BIT(3) #define XILINX_CDMA_CR_SGMODE BIT(3)
#define xilinx_prep_dma_addr_t(addr) \
((dma_addr_t)((u64)addr##_##msb << 32 | (addr)))
/** /**
* struct xilinx_vdma_desc_hw - Hardware Descriptor * struct xilinx_vdma_desc_hw - Hardware Descriptor
* @next_desc: Next Descriptor Pointer @0x00 * @next_desc: Next Descriptor Pointer @0x00