PCI_IO_LIMIT_UPPER16
pci_write_config_word(dev, PCI_IO_LIMIT_UPPER16,
pci_bus_write_config_word(ibmphp_pci_bus, devfn, PCI_IO_LIMIT_UPPER16, 0x0000);
pci_bus_read_config_word(ibmphp_pci_bus, devfn, PCI_IO_LIMIT_UPPER16, &upper_io_end);
pci_read_config_word(dev, PCI_IO_LIMIT_UPPER16, &io_limit_hi);