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be atomic.

For SSB it's not always 100% atomic, but we're always safe
due to some assumptions being made. But this is an SSB implementation
detail that is different from AXI. So don't look too closely
at the SSB implementation of the I/O functions. You certainly want
to implement them slightly differently in AXI. SSB currently doesn't
make use of the additional sliding windows, because they are not
available in the majority of SSB devices.

The AXI bus subsystem will manage the sliding windows and the driver
doesn't know about the details.

-- 
Greetings Michael.