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dmaengine: dma_slave_config: add support for slave port window 

Some slave devices uses address window instead of single register for read
and/or write of data. With the src/dst_port_window_size the address window
can be specified and the DMAengine driver should use this information to
correctly set up the transfer to loop within the provided window.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Peter Ujfalusi 2016-11-29 16:23:41 +02:00 committed by Vinod Koul
parent 0741b81924
commit 54cd255808
1 changed files with 8 additions and 0 deletions
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8
include/linux/dmaengine.h
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@ -336,6 +336,12 @@ enum dma_slave_buswidth {
* may or may not be applicable on memory sources.
* @dst_maxburst: same as src_maxburst but for destination target
* mutatis mutandis.
* @src_port_window_size: The length of the register area in words the data need
* to be accessed on the device side. It is only used for devices which is using
* an area instead of a single register to receive the data. Typically the DMA
* loops in this area in order to transfer the data.
* @dst_port_window_size: same as src_port_window_size but for the destination
* port.
* @device_fc: Flow Controller Settings. Only valid for slave channels. Fill
* with 'true' if peripheral should be flow controller. Direction will be
* selected at Runtime.
@ -363,6 +369,8 @@ struct dma_slave_config {
enum dma_slave_buswidth dst_addr_width;
u32 src_maxburst;
u32 dst_maxburst;
u32 src_port_window_size;
u32 dst_port_window_size;
bool device_fc;
unsigned int slave_id;
};