PCI: iproc: Add PAXC interface support
Traditionally, all iProc PCIe root complexes use PAXB-based wrapper, with an integrated on-chip Serdes to support external endpoint devices. On newer iProc platforms, a PAXC-based wrapper is introduced, for connection with internally emulated PCIe endpoint devices in the ASIC. Add support for PAXC-based iProc PCIe root complex in the iProc PCIe core driver. This change factors out common logic between PAXB and PAXC, and uses tables to store register offsets that are different between PAXB and PAXC. This allows the driver to be scaled to support subsequent PAXC revisions in the future. Signed-off-by: NRay Jui <rjui@broadcom.com> Signed-off-by: NBjorn Helgaas <bhelgaas@google.com> Reviewed-by: NScott Branden <sbranden@broadcom.com>
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