Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1526352

[PATCH v2 1/2] dmaengine: dma_slave_config: add support for slave port window

Show all headers | View raw

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>
---
 include/linux/dmaengine.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index cc535a478bae..689d44327ef3 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 the data need to be
+ * written 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;
 };
-- 
2.10.2

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v2 0/2] dmaengine: core/omap-dma: Support for port window Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-11-19 07:10 +0100
  [PATCH v2 1/2] dmaengine: dma_slave_config: add support for slave port window Peter Ujfalusi <peter.ujfalusi@ti.com> - 2016-11-21 05:20 +0100
  Re: [PATCH v2 2/2] dmaengine: omap-dma: Support for slave devices  with data port window Vinod Koul <vinod.koul@intel.com> - 2016-11-25 07:10 +0100

csiph-web