Peter Crosthwaite d0ac820fe4 char/cadence_uart: Fix can_receive logic
The can_receive logic was only taking into account the RxFIFO
occupancy. RxFIFO population is only used for the echo and normal modes
however. Improve the logic to correctly return the true number of
receivable characters based on the current mode:

Normal mode: RxFIFO vacancy.
Remote loopback: TxFIFO vacancy.
Echo mode: The min of the TxFIFO and RxFIFO vacancies.
Local Loopback: Return non-zero (to implement droppage)

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 36a58440c9ca5080151e95765c2c81342de8a8df.1388626249.git.peter.crosthwaite@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
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Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org

- QEMU team
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A fork of QEMU-Nyx which is better suited for my bachelors thesis
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