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4 Commits (cb1e3f6d705c6b1808e96ef6e5873c18e9d33a36)

Author SHA1 Message Date
Benjamin Herrenschmidt 5c2fc47e2c xics: Add simple ICS 
Move the external interrupt generation to a separate module
"ICS" (source controller) which a register per source containing
currently only the priority control.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Benjamin Herrenschmidt 0fa14f6dec xics: ICP should be big endian ! 
That's how Linux expects it. This also simplifies the
register access implementation since the bit fields now
align properly regardless of the access size.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Benjamin Herrenschmidt 573b6b4bc4 soc: Rework interconnect 
This changes the SoC interconnect such that the main 64-bit wishbone out
of the processor is first split between only 3 slaves (BRAM, DRAM and a
general "IO" bus) instead of all the slaves in the SoC.

The IO bus leg is then latched and down-converted to 32 bits data width,
before going through a second address decoder for the various IO devices.

This significantly reduces routing and timing pressure on the main bus,
allowing to get rid of frequent timing violations when synthetizing on
small'ish FPGAs such as the Artix-7 35T found on the original Arty board.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Michael Neuling 0076f8bf1d XICS test case 
Checks interrupt masking and priorities.

Adds to `make test_xics` which is run in `make check` also.

Signed-off-by: Michael Neuling <mikey@neuling.org>