• Ira Snyder's avatar
    misc: Add CARMA DATA-FPGA Access Driver · c186f0e1
    Ira Snyder authored
    This driver allows userspace to access the data processing FPGAs on the
    OVRO CARMA board. It has two modes of operation:
    
    1) random access
    
    This allows users to poke any DATA-FPGA registers by using mmap to map
    the address region directly into their memory map.
    
    2) correlation dumping
    
    When correlating, the DATA-FPGA's have special requirements for getting
    the data out of their memory before the next correlation. This nominally
    happens at 64Hz (every 15.625ms). If the data is not dumped before the
    next correlation, data is lost.
    
    The data dumping driver handles buffering up to 1 second worth of
    correlation data from the FPGAs. This lowers the realtime scheduling
    requirements for the userspace process reading the device.
    Signed-off-by: default avatarIra W. Snyder <iws@ovro.caltech.edu>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    c186f0e1
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