[PATCH 24/32] pci: PCIe driver for Marvell Armada 370/XP systems

[Mitch Bradley]

On 3/11/2013 8:23 AM, Jason Gunthorpe wrote:
>> (b) The discovery/enumeration code needs to access config space via
>> pci_ops.  The root complex driver implements pci_ops based on a trivial
>> parsing of ranges (omitting irrelevant details):
>>
>> pci_op_read(devfn, pos) {
>>    loop_over_ranges_entries {
>>       if (to_devfn(ranges_entry.child) == devfn) {
>>          return mmio_read(ranges_entry.parent + pos);
>                             ^^^^^^^^^^^^^^^^^^^
> 
> This has to be converted through all enclosing node's ranges prior to
> being used as a CPU address - the OF core has all the code to do this,
> but a new entry point would be needed for this specific application...

Agreed.  But I was considering that detail to be outside the scope of
this discussion because the same thing must happen for any physical
address at this level of the tree.

> 
> Cheers,
> Jason
>