Intel SDK for OpenCL Applications does support Atom Chips, but only for Windows and Android. The Linux is currently not supported.
The SDK for Windows can be downloaded here: https://software.intel.com/en-us/intel-opencl - it includes Android bits as well.
For Linux, you can either try Open Source Beignet driver http://www.freedesktop.org/wiki/Software/Beignet/ or download a CPU Runtime from here https://software.intel.com/en-us/articles/opencl-drivers - I haven't tried these options, so your mileage may vary.
Depends on which OS you are using. Windows and Linux versions don't support GPU (CPU only). Android is CPU for external customers. We have internal version that supports GPU.