anyone used i2c-algo-8260 for the MPC8272 family?

anyone used i2c-algo-8260 for the MPC8272 family?

[Ron Kellam]

Hi all,

I'm trying to get i2c-algo-8260 and i2c-pm826 working on an MPC8247.
It doesn't... It just hangs the kernel.

There are some subtle differences b/t the 8260 family and 8272 family.
The 8272 family only has 8KB DPRAM (c.f. 16KB), so I believe the
definition of PROFF_I2C in include/linux/cpm_8260.h should be
different.  I've changed it from:

	#define PROFF_I2C	((16 * 1024) - 64)
to 
	#define PROFF_I2C	((8 * 1024) - 64)

but still get no I2C activity, and a kernel hang.

Anyone have this working, or any thoughts to contribute?

Regards,
Ron Kellam.

anyone used i2c-algo-8260 for the MPC8272 family?

[Ron Kellam]

I'm posting this just to capture the solution.  An actual patch may
follow sometime down the track.

By looking over some code I got from Dave Bruce (thanks Dave!), I
tried replacing the use of __pa() with iopa().  With just this change,
the driver now "works for me".

I'm not sure of the details of the difference.  Anyone care to
elaborate?

By the way, as stated in another thread, I'm working with a
denx-2.4.25 kernel.

Regards,
Ron Kellam.

anyone used i2c-algo-8260 for the MPC8272 family?

[Heiko Schocher]

Hi Ron,

> There are some subtle differences b/t the 8260 family and 8272 family.
> The 8272 family only has 8KB DPRAM (c.f. 16KB), so I believe the
> definition of PROFF_I2C in include/linux/cpm_8260.h should be
> different.  I've changed it from:
> 
> 	#define PROFF_I2C	((16 * 1024) - 64)
> to 
> 	#define PROFF_I2C	((8 * 1024) - 64)
> 
> but still get no I2C activity, and a kernel hang.

I think your change above is right for a MPC8247.

> Anyone have this working, or any thoughts to contribute?

Look at my Patch, which I just posted at linuxppc-dev, which 
(I hope) will help you (!! it is for a MPC8260 based Board):

http://ozlabs.org/pipermail/linuxppc-dev/2005-November/020492.html

or have a look at the Git repository at Denx:

http://source.denx.net/git/linux-2.6-denx.git

where you can find the complete PM82x port for the 2.6.14 Kernel.

Best regards,
Heiko