I made an OpenCL-only fglrx package that can run on Ubuntu 16.04, however you will need another GPU to run your desktop. I posted the full solution here:
https://community.amd.com/thread/202821
Basically, this is a OpenCL-only fglrx driver and it does not conflict with other graphics drivers. You can install a low-end GPU for desktop only, and use your FirePro just for compute. In my case I have a HD 6450 for X desktop (using the opensource radeon driver) and a R9 280X for OpenCL, and it works flawlessly.
https://community.amd.com/thread/202821
Basically, this is a OpenCL-only fglrx driver and it does not conflict with other graphics drivers. You can install a low-end GPU for desktop only, and use your FirePro just for compute. In my case I have a HD 6450 for X desktop (using the opensource radeon driver) and a R9 280X for OpenCL, and it works flawlessly.