Re: CPM2 USB host driver

[Laurent Pinchart <laurentp@cse-semaphore.com>]

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On Friday 30 November 2007 12:16, Vitaly Bordug wrote:
> On Fri, 30 Nov 2007 11:45:49 +0100
>
> Laurent Pinchart wrote:
> > Hi everybody,
> >
> > Linux USB host support for the CPM, CPM2 and CPM2 pro is far from
> > complete. Many people showed interest on this list (and on
> > linuxppc-embedded) in the past, but nobody managed to complete a
> > driver and get it merged.
>
> that is mainly because of its semi-software nature. However, any approach
> would be helpful I beleive.

The CPM/CPM2 USB host controller does indeed put some pressure on the CPU. The 
PowerQuick III family is much better in that respect as its USB host 
controller is EHCI compliant.

We plan to use an external USB host controller when we will redesign the 
hardware. My goal in writting a CPM2 USB host driver is mainly to enable the 
hardware team to perform EMC testing on the USB interface. I don't expect it 
to be shipped to any client, but I'd still like to get it merged (if I 
complete the project) as I don't like throwing away useful code.

> > As I need USB host support on my MPC8248 (CPM2), I decided to scratch
> > the itch and try to get a working driver that could be merged
> > upstream. This mail describes my plans to make sure the code I write
> > will be useful for other people.
> >
> > The driver will be based on the cpm2usb project
> > (http://cpm2usb.sf.net/). As I don't own any CPM1-based platform, I
> > will convert the driver to use the CPM2 transaction-level interface,
> > thus making it incompatible with the CPM1. CPM1 support could be
> > added back later. There is no planned release date, and more urgent
> > projects could put this development on hold.
> >
> > Comments are welcome (and contributions too, especially in the form
> > of a working driver :-)).
>
> I may have some WIP material left, will try to dig it out...

Should I wait ?

Best regards,

-- 
Laurent Pinchart
CSE Semaphore Belgium

Chaussée de Bruxelles, 732A
B-1410 Waterloo
Belgium

T +32 (2) 387 42 59
F +32 (2) 387 42 75

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