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Author SHA1 Message Date
Benjamin Herrenschmidt bd42580a42 pp_fifo: Fix full fifo losing all data on simultaneous push & pop 
The pp_fifo decides whether top = bottom means empty or full based
on whether the previous operation was a push or a pop.

If the fifo performs both in one cycle, it sets the previous op to
pop. That means that a full fifo being added a character and removed
one at the same time becomes empty.

Instead, just leave the previous op alone. If the fifo was empty, it
remains so, if it was full ditto.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Anton Blanchard 7aaed5abd5 fifo: Reformat 
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
Anton Blanchard ad6c6790f9 fifo: Remove shared variable 
The shared variable used for FIFO memory is not VHDL 2008 compliant.
I can't see why it needs to be a shared variable since reads and writes
update top and bottom synchronously, meaning they don't need same cycle
access to the FIFO memory.

Signed-off-by: Anton Blanchard <anton@linux.ibm.com>
Anton Blanchard 5a29cb4699 Initial import of microwatt 
Signed-off-by: Anton Blanchard <anton@linux.ibm.com>