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dmaengine: Add flow controller information to dma_slave_config 

Flow controller is programmable for few controllers and there are few
intelligent peripherals like, Synopsys JPEG controller, that needs to be a flow
controller of DMA transfers on dest side.

For this, currently two drivers, pl08x and dw_dmac, support flow controller to
be passed from platform to these drivers.

Perhaps, this should be a part of struct dma_slave_config. This patch adds
another field device_fc to this structure. User drivers must pass this as true
if they want to be flow controller of certain transfers.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
This commit is contained in:
Viresh Kumar 2012-02-01 16:12:18 +05:30 committed by Vinod Koul
parent 7414a1b8b2
commit dcc043dc0c
1 changed files with 5 additions and 0 deletions
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5
include/linux/dmaengine.h
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@ -25,6 +25,7 @@
#include <linux/uio.h>
#include <linux/scatterlist.h>
#include <linux/bitmap.h>
#include <linux/types.h>
#include <asm/page.h>
/**
@ -331,6 +332,9 @@ 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.
* @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.
*
* This struct is passed in as configuration data to a DMA engine
* in order to set up a certain channel for DMA transport at runtime.
@ -357,6 +361,7 @@ struct dma_slave_config {
enum dma_slave_buswidth dst_addr_width;
u32 src_maxburst;
u32 dst_maxburst;
bool device_fc;
};
static inline const char *dma_chan_name(struct dma_chan *chan)