[PATCH 0/4 for-4.5] xen: arm: xgene bug fixes + support for McDivitt

[Ian Campbell <Ian.Campbell@citrix.com>]

These patches:

      * fix up an off by one bug in the xgene mapping of additional PCI
        bus resources, which would cause an additional extra page to be
        mapped
      * correct the size of the mapped regions to match the docs
      * adds support for the other 4 PCI buses on the chip, which
        enables mcdivitt and presumably most other Xgene based platforms
        which uses PCI buses other than pcie0.
      * adds earlyprintk for the mcdivitt platform

McDivitt is the X-Gene based HP Moonshot cartridge (McDivitt is the code
name, I think the product is called m400, not quite sure).

Other than the bug fixes I'd like to see the mcdivitt support
(specifically the "other 4 PCI buses" one) in 4.5 because Moonshot is an
interesting and exciting platform for arm64. It is also being used for
ongoing work on Xen on ARM on Openstack in Linaro. The earlyprintk patch
is totally harmless unless it's explicitly enabled at compile time, IMHO
if we are taking the rest we may as well throw it in...

The risk here is that we break the existing support for the Mustang
platform, which would be the most likely failure case for the second
patch. I've tested these on a Mustang, including firing up a PCI NIC
device. The new mappings are a superset of the existing ones so the
potential for breakage should be quite small.

I've also successfully tested on a McDivitt.

Ian.