* Clarification regarding DMA in s3c2440.
@ 2011-04-26 16:16 mindentropy
2011-04-27 15:41 ` Vasily Khoruzhick
0 siblings, 1 reply; 3+ messages in thread
From: mindentropy @ 2011-04-26 16:16 UTC (permalink / raw)
To: linux-arm-kernel
Hi All,
I am having some trouble understanding the datasheet of s3c2440 CPU in
the DMA part.(I am trying to understand the dma controller code).
In chapter 8 second page under the heading DMA request sources the
number of sources should be 7 and not 4. In the s3c2410 the sources
are 5 but they have given it as 4. I would be really grateful if
somebody can please verify it and let me know where I am going wrong.
Link location : http://www.friendlyarm.net/dl.php?file=S3C2440.pdf
Thanks in advance.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Clarification regarding DMA in s3c2440.
2011-04-26 16:16 Clarification regarding DMA in s3c2440 mindentropy
@ 2011-04-27 15:41 ` Vasily Khoruzhick
2011-04-27 18:07 ` mindentropy
0 siblings, 1 reply; 3+ messages in thread
From: Vasily Khoruzhick @ 2011-04-27 15:41 UTC (permalink / raw)
To: linux-arm-kernel
On Tuesday 26 April 2011 19:16:19 mindentropy wrote:
> Hi All,
>
> I am having some trouble understanding the datasheet of s3c2440 CPU in
> the DMA part.(I am trying to understand the dma controller code).
>
> In chapter 8 second page under the heading DMA request sources the
> number of sources should be 7 and not 4.
True
> In the s3c2410 the sources
> are 5 but they have given it as 4.
s3c2440 has 18 dma sources, but not every channel is valid for some source,
check arch/arm/mach-s3c2440/dma.c, struct s3c24xx_dma_map - it follows table
8-1 in mentioned datasheet.
Regards
Vasily
^ permalink raw reply [flat|nested] 3+ messages in thread
* Clarification regarding DMA in s3c2440.
2011-04-27 15:41 ` Vasily Khoruzhick
@ 2011-04-27 18:07 ` mindentropy
0 siblings, 0 replies; 3+ messages in thread
From: mindentropy @ 2011-04-27 18:07 UTC (permalink / raw)
To: linux-arm-kernel
On Wednesday 27 Apr 2011 9:11:19 pm Vasily Khoruzhick wrote:
> On Tuesday 26 April 2011 19:16:19 mindentropy wrote:
> > Hi All,
> >
> > I am having some trouble understanding the datasheet of s3c2440 CPU in
> >
> > the DMA part.(I am trying to understand the dma controller code).
> >
> > In chapter 8 second page under the heading DMA request sources the
> > number of sources should be 7 and not 4.
>
> True
>
> > In the s3c2410 the sources
> > are 5 but they have given it as 4.
>
> s3c2440 has 18 dma sources, but not every channel is valid for some source,
> check arch/arm/mach-s3c2440/dma.c, struct s3c24xx_dma_map - it follows
> table 8-1 in mentioned datasheet.
>
> Regards
> Vasily
Thanks for the reply. I am following the source. Much clearer there :)
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2011-04-26 16:16 Clarification regarding DMA in s3c2440 mindentropy
2011-04-27 15:41 ` Vasily Khoruzhick
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