axi_dmac: Fix tlast generation on AXI stream master

For the AXI stream interface we want to generate TLAST only at the end of
the transfer, rather than at the end of each burst.

Signed-off-by: Lars-Peter Clausen <[email protected]>

library/axi_dmac/data_mover.v

@@ -68,6 +68,8 @@ parameter ID_WIDTH = 3;
 parameter DATA_WIDTH = 64;
 parameter DISABLE_WAIT_FOR_ID = 1;
 parameter BEATS_PER_BURST_WIDTH = 4;
+parameter LAST = 0; /* 0 = last asserted at the end of each burst, 1 = last only asserted at the end of the transfer */
+
 localparam MAX_BEATS_PER_BURST = 2**(BEATS_PER_BURST_WIDTH);
 
 `include "inc_id.h"
@@ -94,7 +96,7 @@ assign last = eot ? last_eot : last_non_eot;
 assign s_axi_ready = m_axi_ready & pending_burst & active;
 assign m_axi_valid = s_axi_valid & pending_burst & active;
 assign m_axi_data = s_axi_data;
-assign m_axi_last = last;
+assign m_axi_last = LAST ? (last_eot & eot) : last;
 
 // If we want to support zero delay between transfers we have to assert
 // req_ready on the same cycle on which the last load happens.

library/axi_dmac/dest_axi_stream.v

@@ -100,7 +100,8 @@ dmac_data_mover # (
 	.ID_WIDTH(ID_WIDTH),
 	.DATA_WIDTH(S_AXIS_DATA_WIDTH),
 	.BEATS_PER_BURST_WIDTH(BEATS_PER_BURST_WIDTH),
-	.DISABLE_WAIT_FOR_ID(0)
+	.DISABLE_WAIT_FOR_ID(0),
+	.LAST(1)
 ) i_data_mover (
 	.clk(s_axis_aclk),
 	.resetn(s_axis_aresetn),