From d0030c324811e0439a15ef31ca630a56ec067bad Mon Sep 17 00:00:00 2001
From: Ian Moffett <ian@osmora.org>
Date: Mon, 5 Aug 2024 20:37:01 -0400
Subject: soc: bus: Add initial DMA controller hdl sources
Signed-off-by: Ian Moffett <ian@osmora.org>
---
sv/soc/bus/dmactl.sv | 158 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 158 insertions(+)
create mode 100644 sv/soc/bus/dmactl.sv
diff --git a/sv/soc/bus/dmactl.sv b/sv/soc/bus/dmactl.sv
new file mode 100644
index 0000000..8de9c41
--- /dev/null
+++ b/sv/soc/bus/dmactl.sv
@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2024 Athena Systems LLC and Ian Marco Moffett
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the copyright holder nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Description: Generic DMA Controller
+ * Author: Ian Moffett
+ */
+
+module dmactl #(
+ /* MMIO bases for DMA channels */
+ parameter C0_MMIO_BASE = 48'h1000140,
+ parameter C1_MMIO_BASE = 48'h1000153,
+ parameter C2_MMIO_BASE = 48'h1000153,
+ parameter C3_MMIO_BASE = 48'h1000166
+ ) (
+ input wire clk,
+
+ /* MMIO interface */
+ input logic [47:0] mmio_addr,
+ input logic [63:0] mmio_wdata,
+ output logic [63:0] mmio_rdata,
+ input wire mmio_re,
+ input wire mmio_we
+ );
+
+ /* Channel 0 register set */
+ reg [63:0] c0_src;
+ reg [63:0] c0_dest;
+ reg [15:0] c0_size;
+ reg [7:0] c0_ctl;
+
+ /* Channel 1 register set */
+ reg [63:0] c1_src;
+ reg [63:0] c1_dest;
+ reg [15:0] c1_size;
+ reg [7:0] c1_ctl;
+
+ /* Channel 2 register set */
+ reg [63:0] c2_src;
+ reg [63:0] c2_dest;
+ reg [15:0] c2_size;
+ reg [7:0] c2_ctl;
+
+ /* Channel 3 register set */
+ reg [63:0] c3_src;
+ reg [63:0] c3_dest;
+ reg [15:0] c3_size;
+ reg [7:0] c3_ctl;
+
+ initial begin
+ c0_src = 64'b0;
+ c0_dest = 64'b0;
+ c0_size = 16'b0;
+ c0_ctl = 8'b0;
+
+ c1_src = 64'b0;
+ c1_dest = 64'b0;
+ c1_size = 16'b0;
+ c1_ctl = 8'b0;
+
+ c2_src = 64'b0;
+ c2_dest = 64'b0;
+ c2_size = 16'b0;
+ c2_ctl = 8'b0;
+
+ c3_src = 64'b0;
+ c3_dest = 64'b0;
+ c3_size = 16'b0;
+ c3_ctl = 8'b0;
+
+ mmio_rdata = 64'b0;
+ end
+
+ always @(posedge clk) begin
+ /* Handle MMIO reads */
+ if (mmio_re) begin
+ case (mmio_addr)
+ /* Channel 0 */
+ C0_MMIO_BASE: mmio_rdata <= c0_src;
+ C0_MMIO_BASE + 8: mmio_rdata <= c0_dest;
+ C0_MMIO_BASE + 16: mmio_rdata <= { 48'b0, c0_size[15:0] };
+ C0_MMIO_BASE + 24: mmio_rdata <= { 56'b0, c0_ctl[7:0] };
+
+ /* Channel 1 */
+ C1_MMIO_BASE: mmio_rdata <= c1_src;
+ C1_MMIO_BASE + 8: mmio_rdata <= c1_dest;
+ C1_MMIO_BASE + 16: mmio_rdata <= { 48'b0, c1_size[15:0] };
+ C1_MMIO_BASE + 24: mmio_rdata <= { 56'b0, c1_ctl[7:0] };
+
+ /* Channel 2 */
+ C2_MMIO_BASE: mmio_rdata <= c2_src;
+ C2_MMIO_BASE + 8: mmio_rdata <= c2_dest;
+ C2_MMIO_BASE + 16: mmio_rdata <= { 48'b0, c2_size[15:0] };
+ C2_MMIO_BASE + 24: mmio_rdata <= { 56'b0, c2_ctl[7:0] };
+
+ /* Channel 3 */
+ C3_MMIO_BASE: mmio_rdata <= c3_src;
+ C3_MMIO_BASE + 8: mmio_rdata <= c3_dest;
+ C3_MMIO_BASE + 16: mmio_rdata <= { 48'b0, c3_size[15:0] };
+ C3_MMIO_BASE + 24: mmio_rdata <= { 56'b0, c3_ctl[7:0] };
+ endcase
+ end
+
+ /* Handle MMIO writes */
+ if (mmio_we) begin
+ case (mmio_addr)
+ /* Channel 0 */
+ C0_MMIO_BASE: c0_src <= mmio_wdata;
+ C0_MMIO_BASE + 8: c0_dest <= mmio_wdata;
+ C0_MMIO_BASE + 16: c0_size <= mmio_wdata[15:0];
+ C0_MMIO_BASE + 24: c0_ctl <= mmio_wdata[7:0];
+
+ /* Channel 1 */
+ C1_MMIO_BASE: c1_src <= mmio_wdata;
+ C1_MMIO_BASE + 8: c1_dest <= mmio_wdata;
+ C1_MMIO_BASE + 16: c1_size <= mmio_wdata[15:0];
+ C1_MMIO_BASE + 24: c1_ctl <= mmio_wdata[7:0];
+
+ /* Channel 2 */
+ C2_MMIO_BASE: c2_src <= mmio_wdata;
+ C2_MMIO_BASE + 8: c2_dest <= mmio_wdata;
+ C2_MMIO_BASE + 16: c2_size <= mmio_wdata[15:0];
+ C2_MMIO_BASE + 24: c2_ctl <= mmio_wdata[7:0];
+
+ /* Channel 3 */
+ C3_MMIO_BASE + 8: c3_dest <= mmio_wdata;
+ C3_MMIO_BASE + 16: c3_size <= mmio_wdata[15:0];
+ C3_MMIO_BASE + 24: c3_ctl <= mmio_wdata[7:0];
+ endcase
+ end
+ end
+endmodule
--
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