linux-kernel - [PATCH V2 02/12] dmaengine: Add flow controller information to dma_slave

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Date:	Wed, 18 Jan 2012 14:41:49 +0530
From:	Viresh Kumar <viresh.kumar@...com>
To:	<vinod.koul@...el.com>, <dan.j.williams@...el.com>
Cc:	<cjb@...top.org>, <rmk+kernel@....linux.org.uk>,
	<linus.walleij@...aro.org>, <ulf.hansson@...ricsson.com>,
	<linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<egtvedt@...fundet.no>, <hskinnemoen@...il.com>,
	<kernel@...gutronix.de>, <perex@...ex.cz>,
	<linux-arm-kernel@...ts.infradead.org>, <armando.visconti@...com>,
	<shiraz.hashim@...com>, <vipin.kumar@...com>,
	<rajeev-dlh.kumar@...com>, <deepak.sikri@...com>,
	<vipulkumar.samar@...com>, <amit.virdi@...com>,
	<viresh.kumar@...com>, <pratyush.anand@...com>,
	<bhupesh.sharma@...com>, <viresh.linux@...il.com>,
	<bhavna.yadav@...com>, <vincenzo.frascino@...com>,
	<mirko.gardi@...com>
Subject: [PATCH V2 02/12] 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@...com>
---
 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)
-- 
1.7.8.110.g4cb5d

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