Change in coreboot[master]: sc7280: Add PCIe host controller driver

[Shelley Chen (Code Review)]

Attention is currently required from: Ravi kumar, Furquan Shaikh, Paul Menzel, Ravi Kumar Bokka, Julius Werner, Prasad Malisetty, mturney mturney.
Shelley Chen has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/53902 )

Change subject: sc7280: Add PCIe host controller driver
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Patch Set 66:

(2 comments)

Patchset:

PS66: 
I don't see any changes to src/soc/qualcomm/sc7280/Kconfig, as mentioned in: https://review.coreboot.org/c/coreboot/+/58668/4/src/soc/qualcomm/sc7280/Kco...

You need to add PCI (because you are using PCI support) and you need to set NO_ECAM_MMCONF_SUPPORT because you are not using ECAM.  Once you set those Kconfigs, you'll start to see compilation errors due to pci_map_bus not being defined.  This should be your atu mapping function that you defined in pcie_host.c.

File src/soc/qualcomm/sc7280/pcie_host.c:

https://review.coreboot.org/c/coreboot/+/53902/comment/9d4d3c3a_f803c708 
PS66, Line 367: qcom_dw_pcie_prog_outbound_atu
This is the main address mapping function, correct?  Then this needs to be renamed pci_map_bus (or create a wrapper around this), as that needs to be defined if you are not using the ECAM method.  The function prototype is defined in pci_mmio_cfg.h:

volatile union pci_bank *pci_map_bus(pci_devfn_t dev);