Here's the driver source code:
https://github.com/Xilinx/embeddedsw/tree/master/XilinxProcessorIPLib/drivers/rfdc/src

Here's an example of how this is done with pynq:
https://github.com/MazinLab/MKIDGen3/blob/develop/mkidgen3/drivers/rfdc.py#L106-L267

Here's an example of how this is done with casper:
https://casper-toolflow.readthedocs.io/projects/tutorials/en/latest/tutorials/rfsoc/tut_rfdc.html

Here's the Xilinx petalinux example receipe:
https://github.com/Xilinx/meta-petalinux/blob/master/recipes-bsp/rfdc-examples/rfdc-examples.inc

RFDC Linux driver documentation:
https://xilinx.github.io/embeddedsw.github.io/rfdc/doc/html/api/xrfdc_8h.html

Creating Linux application targeting the RFDC driver in SDK 2018.3
https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/70254659/Creating+Linux+application+targeting+the+RFDC+driver+in+SDK+2018.3