Fwd: DesignWare DMA Controller on at91sam9263

[Valentin Sitdikov]

---------- Forwarded message ----------
From: Valentin Sitdikov <v.sitdikov at gmail.com>
Date: Wed, Jan 13, 2010 at 3:08 PM
Subject: DesignWare DMA Controller on at91sam9263
To: haavard.skinnemoen at atmel.com
Cc: linux-arm-kernel at lists.arm.linux.org.uk


Hello Haavard.

Could you please comment something on my problem?

Currently i am working on getting at91sam9263 dmac working under demaenige
framework.
So I have investigating that it is a kind of copy Synopsys DesignWare DMA
Controller
which is used in AVR32.
But there is at least one difference:
AVR32 BLOCK_TS is 11 bit wide but at91sam9263 BLOCK_TS is 5 bit size
So your driver is working on at91sam9263 taking in to account this
difference.

As you can imagine to have such a small dma transaction is not quite
convenient.
May be you can recommend something to overcome 5 bit restriction?

There is also bit field in config register which is called MAX_ABRST the
meaning of
which is not quite clear. It is 10 bits long,
So why it 10 bits long if BLOCK_TS only 5 bits long?
What real meaning has it ?

Thanks in advance.
Valentin.
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