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

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Date:	Tue, 31 Jan 2012 09:24:42 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Viresh Kumar <viresh.kumar@...com>
Cc:	dan.j.williams@...el.com, 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,
	pratyush.anand@...com, bhupesh.sharma@...com,
	viresh.linux@...il.com, bhavna.yadav@...com,
	vincenzo.frascino@...com, mirko.gardi@...com
Subject: Re: [PATCH V2 02/12] dmaengine: Add flow controller information to
 dma_slave_config

On Wed, 2012-01-18 at 14:41 +0530, Viresh Kumar wrote:
> 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
ccfg maybe true for your controller, not others...

> + * 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)


-- 
~Vinod

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