diff options
| author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2016-11-29 16:23:41 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2016-11-30 08:54:04 +0530 |
| commit | 54cd255808761ecfd0e000eb78eb74dde8cd0c96 (patch) | |
| tree | e1d7cb88a895e37b593c4aba2c9791206d81c5e0 /include/linux/dmaengine.h | |
| parent | 0741b819246029a7e53b8edcc5693debd7c00c8f (diff) | |
| download | linux-rt-54cd255808761ecfd0e000eb78eb74dde8cd0c96.tar.gz | |
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>
Diffstat (limited to 'include/linux/dmaengine.h')
| -rw-r--r-- | include/linux/dmaengine.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h index cc535a478bae..feee6ec6a13b 100644 --- a/include/linux/dmaengine.h +++ b/include/linux/dmaengine.h @@ -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; }; |