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axi_dmac: Add identification register 

Add a register to the AXI DMAC register map which functions has a
identification register. The register contains the unique value of "DMAC"
(0x444d4143) and allows software to identify whether the peripheral mapped
at a certain address is an axi_dmac peripheral.

This is useful for detecting cases where the specified address contains an
error or is incorrect.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
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Lars-Peter Clausen 2017-01-28 19:23:43 +01:00
parent 48ad24cdbe
commit 3dd736fe8c
1 changed files with 1 additions and 0 deletions
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library/axi_dmac/axi_dmac.v
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@ -420,6 +420,7 @@ begin
12'h000: up_rdata <= PCORE_VERSION;
12'h001: up_rdata <= ID;
12'h002: up_rdata <= up_scratch;
12'h003: up_rdata <= 32'h444d4143; // "DMAC"
12'h020: up_rdata <= up_irq_mask;
12'h021: up_rdata <= up_irq_pending;
12'h022: up_rdata <= up_irq_source;