Add first draft of eASIC back-end

2 files changed, 191 insertions, 0 deletions

diff --git a/techlibs/easic/Makefile.inc b/techlibs/easic/Makefile.inc
new file mode 100644
index 000000000..fb05a8a88
--- /dev/null
+++ b/techlibs/easic/Makefile.inc
@@ -0,0 +1,3 @@
+
+OBJS += techlibs/easic/synth_easic.o
+
diff --git a/techlibs/easic/synth_easic.cc b/techlibs/easic/synth_easic.cc
new file mode 100644
index 000000000..e17138f3a
--- /dev/null
+++ b/techlibs/easic/synth_easic.cc
@@ -0,0 +1,188 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
+ *
+ *  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/register.h"
+#include "kernel/celltypes.h"
+#include "kernel/rtlil.h"
+#include "kernel/log.h"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+struct SynthEasicPass : public ScriptPass
+{
+	SynthEasicPass() : ScriptPass("synth_easic", "synthesis for eASIC platform") { }
+
+	virtual void help() YS_OVERRIDE
+	{
+		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+		log("\n");
+		log("    synth_easic [options]\n");
+		log("\n");
+		log("This command runs synthesis for eASIC platform.\n");
+		log("\n");
+		log("    -top <module>\n");
+		log("        use the specified module as top module\n");
+		log("\n");
+		log("    -vlog <file>\n");
+		log("        write the design to the specified structural Verilog file. writing of\n");
+		log("        an output file is omitted if this parameter is not specified.\n");
+		log("\n");
+		log("    -etools <path>\n");
+		log("        set path to the eTools installation. (default=/opt/eTools)\n");
+		log("\n");
+		log("    -run <from_label>:<to_label>\n");
+		log("        only run the commands between the labels (see below). an empty\n");
+		log("        from label is synonymous to 'begin', and empty to label is\n");
+		log("        synonymous to the end of the command list.\n");
+		log("\n");
+		log("    -noflatten\n");
+		log("        do not flatten design before synthesis\n");
+		log("\n");
+		log("    -retime\n");
+		log("        run 'abc' with -dff option\n");
+		log("\n");
+		log("\n");
+		log("The following commands are executed by this synthesis command:\n");
+		help_script();
+		log("\n");
+	}
+
+	string top_opt, vlog_file, etools_path;
+	bool flatten, retime;
+
+	virtual void clear_flags() YS_OVERRIDE
+	{
+		top_opt = "-auto-top";
+		vlog_file = "";
+		etools_path = "/opt/eTools";
+		flatten = true;
+		retime = false;
+	}
+
+	virtual void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
+	{
+		string run_from, run_to;
+		clear_flags();
+
+		size_t argidx;
+		for (argidx = 1; argidx < args.size(); argidx++)
+		{
+			if (args[argidx] == "-top" && argidx+1 < args.size()) {
+				top_opt = "-top " + args[++argidx];
+				continue;
+			}
+			if (args[argidx] == "-vlog" && argidx+1 < args.size()) {
+				vlog_file = args[++argidx];
+				continue;
+			}
+			if (args[argidx] == "-etools" && argidx+1 < args.size()) {
+				etools_path = args[++argidx];
+				continue;
+			}
+			if (args[argidx] == "-run" && argidx+1 < args.size()) {
+				size_t pos = args[argidx+1].find(':');
+				if (pos == std::string::npos)
+					break;
+				run_from = args[++argidx].substr(0, pos);
+				run_to = args[argidx].substr(pos+1);
+				continue;
+			}
+			if (args[argidx] == "-noflatten") {
+				flatten = false;
+				continue;
+			}
+			if (args[argidx] == "-retime") {
+				retime = true;
+				continue;
+			}
+			break;
+		}
+		extra_args(args, argidx, design);
+
+		if (!design->full_selection())
+			log_cmd_error("This comannd only operates on fully selected designs!\n");
+
+		log_header(design, "Executing SYNTH_EASIC pass.\n");
+		log_push();
+
+		run_script(design, run_from, run_to);
+
+		log_pop();
+	}
+
+	virtual void script() YS_OVERRIDE
+	{
+		string phys_clk_lib = stringf("%s/data_ruby28/design_libs/logical/timing/gp/n3x_phys_clk_0v893ff125c.lib", etools_path.c_str());
+		string logic_lut_lib = stringf("%s/data_ruby28/design_libs/logical/timing/gp/n3x_logic_lut_0v893ff125c.lib", etools_path.c_str());
+
+		if (check_label("begin"))
+		{
+			run(stringf("read_liberty -lib %s", help_mode ? "<etools_phys_clk_lib>" : phys_clk_lib.c_str()));
+			run(stringf("read_liberty -lib %s", help_mode ? "<etools_logic_lut_lib>" : logic_lut_lib.c_str()));
+			run(stringf("hierarchy -check %s", help_mode ? "-top <top>" : top_opt.c_str()));
+		}
+
+		if (flatten && check_label("flatten", "(unless -noflatten)"))
+		{
+			run("proc");
+			run("flatten");
+		}
+
+		if (check_label("coarse"))
+		{
+			run("synth -run coarse");
+		}
+
+		if (check_label("fine"))
+		{
+			run("opt -fast -mux_undef -undriven -fine");
+			run("memory_map");
+			run("opt -undriven -fine");
+			run("techmap");
+			run("opt -fast");
+			if (retime || help_mode) {
+				run("abc -dff", " (only if -retime)");
+				run("opt_clean", "(only if -retime)");
+			}
+		}
+
+		if (check_label("map"))
+		{
+			run(stringf("dfflibmap -liberty %s", help_mode ? "<etools_phys_clk_lib>" : phys_clk_lib.c_str()));
+			run(stringf("abc -liberty %s", help_mode ? "<etools_logic_lut_lib>" : logic_lut_lib.c_str()));
+			run("opt_clean");
+		}
+
+		if (check_label("check"))
+		{
+			run("hierarchy -check");
+			run("stat");
+			run("check -noinit");
+		}
+
+		if (check_label("vlog"))
+		{
+			if (!vlog_file.empty() || help_mode)
+				run(stringf("write_verilog -noexpr -attr2comment %s", help_mode ? "<file-name>" : vlog_file.c_str()));
+		}
+	}
+} SynthEasicPass;
+
+PRIVATE_NAMESPACE_END