The axi_dmac core generates requests which are both AXI3 and AXI4
compliant. This means it is possible to connect it to both a AXI3 or AXI4
slave port without needing a AXI protocol converter. Unfortunately it is
not possible to declare a port as both AXI3 and AXI4 compliant, so the core
has the C_DMA_AXI_PROTCOL_SRC and C_DMA_AXI_PROTOCOL_DEST parameters, which
allow to configure the protocol type of the corresponding AXI master
interface. Currently the default is always AXI4.
But when being used on ZYNQ it is most likely that the AXI master interface
of the DMAC core ends up being connected to the AXI3, so change the default
to AXI3 if the core is instantiated in a ZYNQ design.
The default can still be overwritten by explicitly setting the
configuration property.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Add support for querying the clock domains of the clock pins for the
axi_dmac controller. This allows the core to automatically figure out
whether its different parts run in different clock domains or not and setup
the configuration parameters accordingly.
Being able to auto-detect those configuration parameters makes the core
easier to use and also avoids accidental misconfiguration.
It is still possible to automatically overwrite the configuration
parameters by hand if necessary.
Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Lars-Peter Clausen