int mca_device_transform_ioport (struct mca_device * mca_dev, int port);
MCA Adapter Definition Files (ADF) contain irq, ioport, memory etc. definitions. In systems with more than one bus, these need to be transformed through bus mapping functions to get the real system global quantities.
This function transforms the I/O port number and returns the transformed system global port number.
This transformation can be assumed to be linear for port ranges.