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
_______________________________
R&D Imaging Devices
Anagramm GmbH
Rupert-Mayer-Str. 45/1
81379 Muenchen
Germany

http://www.anagramm.de
Phone: +49-89-741518-50
Fax: +49-89-741518-19


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@freescale.com] 
Sent: Wednesday, August 03, 2005 11:24 AM
To: Bizhan Gholikhamseh (bgholikh)
Cc: linuxppc-embedded@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:

quoted

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

quoted

address space.
For reason that is beyond the discussion here, the DMA request line on

quoted

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>

_______________________________________________
Linuxppc-embedded mailing list
Linuxppc-embedded@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-embedded