[PATCH 2/8] dmaengine: Add flow controller information to dma_slave_config
From: Viresh Kumar <hidden>
Date: 2012-01-16 09:51:32
Also in:
lkml
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
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 <redacted> --- include/linux/dmaengine.h | 5 +++++ 1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 5532bb8..dd1915f 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h@@ -25,6 +25,7 @@ #include <linux/uio.h> #include <linux/scatterlist.h> #include <linux/bitmap.h> +#include <linux/types.h> #include <asm/page.h> /**
@@ -330,6 +331,9 @@ 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 for ccfg register. 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.
@@ -356,6 +360,7 @@ 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)
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1.7.8.110.g4cb5d