[Skiboot] [PATCH] Add NX P7+ support

[Benjamin Herrenschmidt]

On Mon, 2015-03-16 at 14:03 -0400, Dan Streetman wrote:
> 
> Well the kernel driver doesn't care at all about P7/P8 except for the
> xscom r/w, since the xscom addrs are different between P7/P8.  As I
> haven't actually added any error recovery (via xscoms) to the kernel
> driver yet, I could remove the xscom stuff from the first kernel patch
> set.  However, if the kernel driver is who eventually monitors and
> handles NX errors, I don't see any way around r/w directly from the NX
> xscoms.  The P7/P8 differences should be able to be abstracted in the
> nx-842-xscom.h header though, and I don't think the actual driver will
> need to know the P num.

I don't want linux to know about SCOMS, instead, create OPAL calls, for
example OPAL_GET_NX_STATUS or whatever makes sense for you.

In any case, a XSCOM is a roundtrip to OPAL so the above won't be
slower.

Cheers,
Ben.