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399d34ebc2
While CXL Memory Device endpoints locate the CXL MMIO registers in a PCI BAR, CXL root bridges have their MMIO base address described by platform firmware. Refactor the existing register lookup into a generic facility for endpoints and bridges to share. Reviewed-by: Ben Widawsky <ben.widawsky@intel.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Link: https://lore.kernel.org/r/162096972534.1865304.3218686216153688039.stgit@dwillia2-desk3.amr.corp.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com>