RFC: usb: musb: Adding CPPI4.1 DMA driver under drivers/dma

[Gupta, Ajay Kumar]

Hi,

CPPI4.1 (Communication Port Programming Interface) is a TI specific DMA
controller used in multiple TI platform such as AM33x, DA8x, AM35x, TI81x.
The DMA engine is mainly used by musb controller on above platform.

Earlier version of the driver was submitted by Sergei Shtylyov at [1] but
was not merged due to disagreement on the location of driver in kernel.
Refer the discussions at [1] for more details.

[1] http://marc.info/?l=linux-usb&m=125087318308323

The new implementation of the CPPI4.1 DMA slave driver will be in the
drivers/dma folder, complying to dmaengine framework.
It would involve changes in existing musb driver also for which current
plan is to maintain the compatibility of non-CPPI4.1 DMA in musb driver. 

The task is planned to be spitted into below subtasks.

(1) Post RFC on the API details, changes envisaged in musb driver and other
challenges

(2) Implement and post RFC for the CPPI4.1 DMA driver and changes needed in
musb driver.

Let me know if you have any thoughts/comments on this.

Regards,
Ajay

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