Change in coreboot[master]: libpayload: Add MMIO support in PCI lib

[Prasad Malisetty (Code Review)]

Attention is currently required from: Shelley Chen, Ravi kumar, Furquan Shaikh, Paul Menzel, Julius Werner, Arthur Heymans, Kyösti Mälkki, mturney mturney.
Prasad Malisetty has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/53903 )

Change subject: libpayload: Add MMIO support in PCI lib
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Patch Set 34:

(1 comment)

File payloads/libpayload/drivers/pci_ops.c:

https://review.coreboot.org/c/coreboot/+/53903/comment/baf44567_f920f256 
PS28, Line 37: u32 devfn = ((dev >> 3) & 0x1f) | (dev & 0x07);
> > Similarly in Coreboot PCIe driver we have read/write_config function in which ATU configuration wi […]

Hi Furquan,

Thanks for the clarification.

Sure, if we can have a infrastructure to map coreboot callbacks from libpayload, it would be easy to implement map_bus function for all available buses instead of specific bus case.

Please let me know once the changes are ready. I will do the same for PCI library case.

I have addressed all existing comments on this change. due to some unplanned activities, couldn't post the changes in time. I will share new version changes in day or 2.

Thanks
-Prasad