MPC8541E DMA transfer

[Kumar Gala]

All 85xx processors to date have the same 4 channel DMA engine.

- kumar

On Aug 4, 2005, at 11:52 AM, Bizhan Gholikhamseh \(((bgholikh\))) wrote:

> Hi Clemens,
> Thanks for the code, the processor I am using is MPC8541E which I
> believe have the same DMA engine as mpc8540. I will try it and will  
> let
> you know how it worked.
>
> Thanks,
> Bizhan
>
> -----Original Message-----
> From: Clemens Koller [mailto:clemens.koller at anagramm.de]
> Sent: Thursday, August 04, 2005 5:13 AM
> To: Bizhan Gholikhamseh (bgholikh)
> Cc: linuxppc-embedded at ozlabs.org
> Subject: Re: MPC8541E DMA transfer
>
> Hello, Bizhan!
> and all the other mpc85xx DMA fans.
>
> I am working on the mpc85xx dma stuff (based on Jason's work) on the
> lastest 2.6.x kernels. My cpu is a mpc8540.
> That's all work in progress, so have a look at the code.
>
> Attached you will find some of my test code (a separate kernal module)
> which should compile fine for 2.6 now. Make a symlink ~/linux to the
> latest 2.6 kernel or change the makefile. There is also the latest
> immap_85xx.h (almost complete) included. Some old code is commented
> out...
>
> Not all code is enabled in the module yet, and the dma_test routine
> copys data from physical memory you might not have in your hardware.
> Please change that according to your setup.
>
> Feedback is welcome!
>
> Enjoy!
>
> Clemens Koller
> _______________________________
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> 81379 Muenchen
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>
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>
>
> Bizhan Gholikhamseh (bgholikh) wrote:
>
>> Is there any support in Linux 2.6.X for using this controller, if so,
>> are you aware of any test driver I can take a look at?
>>
>> Thanks,
>> Bizhan
>>
>> Many thanks in
>>
>> -----Original Message-----
>> From: Kumar Gala [mailto:kumar.gala at freescale.com]
>> Sent: Wednesday, August 03, 2005 11:24 AM
>> To: Bizhan Gholikhamseh (bgholikh)
>> Cc: linuxppc-embedded at ozlabs.org
>> Subject: Re: MPC8541E DMA transfer
>>
>> I dont see any reason you couldn't use the internal DMA engine on the
>> MPC8541E to do what you need.  You will just need to schedule the  
>> work
>>
>
>
>> every 10ms.
>>
>> - kumar
>>
>> On Aug 3, 2005, at 10:04 AM, Bizhan Gholikhamseh \(((bgholikh\)))
>>
> wrote:
>
>>
>>
>>
>>> Hi all,
>>> I am developing a linux driver (2.6.10) for Freescale MPC8541E
>>> (customized board) to read and write 8 buffers (each buffer is 960
>>> bytes
>>> long) every 10 ms to/from a custom made PCI card with on board DSP
>>> Chip.
>>> The chip's internal and external memories are memory mapped to  
>>> the CPU
>>>
>>
>>
>>
>>> address space.
>>> For reason that is beyond the discussion here, the DMA request  
>>> line on
>>>
>>
>>
>>
>>> the PCI card is not connected although the PCI card has DMA
>>> capabilities.
>>> So what are my options?
>>> Could I still do DMA transfer from the Host to the device?
>>>
>>> Many thanks in advance,
>>> Bizhan
>>>
>>> <ATT293768.txt>
>>>
>>>
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