axi_dmac: List valid store-and-forward memory sizes

For correct operation the store-and-forward memory size must be a
power-of-two in the range of 2 to 32.

This is simple enough so we can list all values and let the IP Integrator
and QSYS perform proper validation of the parameter.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>

library/axi_dmac/axi_dmac_hw.tcl

@@ -69,6 +69,7 @@ set_parameter_property DMA_LENGTH_WIDTH GROUP $group
 add_parameter FIFO_SIZE INTEGER 4
 set_parameter_property FIFO_SIZE DISPLAY_NAME "FIFO Size (In Bursts)"
 set_parameter_property FIFO_SIZE HDL_PARAMETER true
+set_parameter_property FIFO_SIZE ALLOWED_RANGES {2 4 8 16 32}
 set_parameter_property FIFO_SIZE GROUP $group
 
 add_parameter MAX_BYTES_PER_BURST INTEGER 128

library/axi_dmac/axi_dmac_ip.tcl

@@ -190,6 +190,12 @@ foreach intf [ipx::get_bus_interfaces m_*_axi -of_objects $cc] {
 	set_property "VALUE" "0" $para
 }
 
+set_property -dict [list \
+	"value_validation_type" "list" \
+	"value_validation_list" "2 4 8 16 32" \
+ ] \
+ [ipx::get_user_parameters FIFO_SIZE -of_objects $cc]
+
 set_property -dict [list \
 	"value_validation_type" "range_long" \
 	"value_validation_range_minimum" "8" \
@@ -311,6 +317,7 @@ set_property -dict [list \
 set p [ipgui::get_guiparamspec -name "FIFO_SIZE" -component $cc]
 ipgui::move_param -component $cc -order 2 $p -parent $general_group
 set_property -dict [list \
+	"widget" "comboBox" \
 	"display_name" "FIFO Size (In Bursts)" \
 ] $p