coolrunner2: Initial techmapping for $sop

1 files changed, 111 insertions, 0 deletions

diff --git a/techlibs/coolrunner2/coolrunner2_sop.cpp b/techlibs/coolrunner2/coolrunner2_sop.cpp
new file mode 100644
index 000000000..36bd77ad6
--- /dev/null
+++ b/techlibs/coolrunner2/coolrunner2_sop.cpp
@@ -0,0 +1,111 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2017 Robert Ou <rqou@robertou.com>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "kernel/yosys.h"
+#include "kernel/sigtools.h"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+struct Coolrunner2SopPass : public Pass {
+	Coolrunner2SopPass() : Pass("coolrunner2_sop", "break $sop cells into ANDTERM/ORTERM cells") { }
+	virtual void help()
+	{
+		log("\n");
+		log("    coolrunner2_sop [options] [selection]\n");
+		log("\n");
+		log("Break $sop cells into ANDTERM/ORTERM cells.\n");
+		log("\n");
+	}
+	virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
+	{
+		log_header(design, "Executing COOLRUNNER2_SOP pass (break $sop cells into ANDTERM/ORTERM cells).\n");
+		extra_args(args, 1, design);
+
+		for (auto module : design->selected_modules())
+		{
+			SigMap sigmap(module);
+			for (auto cell : module->selected_cells())
+			{
+				if (cell->type == "$sop")
+				{
+					// Read the inputs/outputs/parameters of the $sop cell
+					auto sop_inputs = sigmap(cell->getPort("\\A"));
+					auto sop_output = sigmap(cell->getPort("\\Y"))[0];
+					auto sop_depth = cell->getParam("\\DEPTH").as_int();
+					auto sop_width = cell->getParam("\\WIDTH").as_int();
+					auto sop_table = cell->getParam("\\TABLE");
+
+					// Construct AND cells
+					pool<SigBit> intermed_wires;
+					for (int i = 0; i < sop_depth; i++) {
+						// Wire for the output
+						auto and_out = module->addWire(NEW_ID);
+						intermed_wires.insert(and_out);
+
+						// Signals for the inputs
+						pool<SigBit> and_in_true;
+						pool<SigBit> and_in_comp;
+						for (int j = 0; j < sop_width; j++)
+						{
+							if (sop_table[2 * (i * sop_width + j) + 0])
+							{
+								and_in_comp.insert(sop_inputs[j]);
+							}
+							if (sop_table[2 * (i * sop_width + j) + 1])
+							{
+								and_in_true.insert(sop_inputs[j]);
+							}
+						}
+
+						// Construct the cell
+						auto and_cell = module->addCell(NEW_ID, "\\ANDTERM");
+						and_cell->setParam("\\TRUE_INP", GetSize(and_in_true));
+						and_cell->setParam("\\COMP_INP", GetSize(and_in_comp));
+						and_cell->setPort("\\OUT", and_out);
+						and_cell->setPort("\\IN", and_in_true);
+						and_cell->setPort("\\IN_B", and_in_comp);
+					}
+
+					// If there is only one term, don't construct an OR cell
+					if (sop_depth == 1)
+					{
+						yosys_xtrace = 1;
+						module->connect(sop_output, *intermed_wires.begin());
+						log("one\n");
+					}
+					else
+					{
+						log("more\n");
+						// Construct the cell
+						auto or_cell = module->addCell(NEW_ID, "\\ORTERM");
+						or_cell->setParam("\\WIDTH", sop_depth);
+						or_cell->setPort("\\IN", intermed_wires);
+						or_cell->setPort("\\OUT", sop_output);
+					}
+
+					// Finally, remove the $sop cell
+					module->remove(cell);
+				}
+			}
+		}
+	}
+} Coolrunner2SopPass;
+
+PRIVATE_NAMESPACE_END