Re: CPM2 USB host driver

[Vitaly Bordug <vitb@kernel.crashing.org>]

On Fri, 30 Nov 2007 13:30:18 +0100
Laurent Pinchart wrote:

> 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 ?
>

Dunno. It was about 3 years ago so the chance is small. 


-- 
Sincerely, Vitaly