yosys/techlibs/intel/synth_intel.cc

/*
 *  yosys -- Yosys Open SYnthesis Suite
 *
 *  Copyright (C) 2012  Claire Xenia Wolf <claire@yosyshq.com>
 *  Copyright (C) 2024  Richard Herveille <richard.herveille@roalogic.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/celltypes.h"
#include "kernel/log.h"
#include "kernel/register.h"
#include "kernel/rtlil.h"

USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN

struct SynthIntelPass : public ScriptPass {
	SynthIntelPass() : ScriptPass("synth_intel", "synthesis for Intel (Altera) FPGAs.") { experimental(); }

	void help() override
	{
		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
		log("\n");
		log("    synth_intel [options]\n");
		log("\n");
		log("This command runs synthesis for Intel FPGAs.\n");
		log("\n");
		log("    -family <max10 | cyclone10lp | cycloneiv | cycloneive>\n");
		log("        generate the synthesis netlist for the specified family.\n");
		log("        MAX10 is the default target if no family argument specified.\n");
		log("        For Cyclone IV GX devices, use cycloneiv argument; for Cyclone IV E, use\n");
		log("        cycloneive. For Cyclone V and Cyclone 10 GX, use the synth_intel_alm\n");
		log("        backend instead.\n");
		log("\n");
		log("    -top <module>\n");
		log("        use the specified module as top module (default='top')\n");
		log("\n");
		log("    -vqm <file>\n");
		log("        write the design to the specified Verilog Quartus Mapping File. Writing\n");
		log("        of an output file is omitted if this parameter is not specified.\n");
		log("        Note that this backend has not been tested and is likely incompatible\n");
		log("        with recent versions of Quartus.\n");
		log("\n");
		log("    -vpr <file>\n");
		log("        write BLIF files for VPR flow experiments. The synthesized BLIF output\n");
		log("        file is not compatible with the Quartus flow. Writing of an\n");
		log("        output file is omitted if this parameter is not specified.\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("    -dff\n");
		log("        pass DFFs to ABC to perform sequential logic optimisations\n");
		log("        (EXPERIMENTAL)\n");
		log("\n");
		log("    -iopads\n");
		log("        use IO pad cells in output netlist\n");
		log("\n");
		log("    -nobram\n");
		log("        do not use block RAM cells in output netlist\n");
		log("\n");
		log("    -nodsp\n");
		log("        do not map multipliers to MUL18/MUL9 cells\n");
		log("\n");
		log("    -noflatten\n");
		log("        do not flatten design before synthesis\n");
		log("\n");
		log("    -retime\n");
		log("        run 'abc' with '-dff -D 1' options\n");
		log("\n");
		log("The following commands are executed by this synthesis command:\n");
		help_script();
		log("\n");
	}

	string top_opt, family_opt, vout_file, blif_file;
	bool retime, flatten, nobram, dff, nodsp, iopads;

	void clear_flags() override
	{
		top_opt = "-auto-top";
		family_opt = "max10";
		vout_file = "";
		blif_file = "";
		retime = false;
		flatten = true;
		nobram = false;
		dff = false;
		nodsp = false;
		iopads = false;
	}

	void execute(std::vector<std::string> args, RTLIL::Design *design) override
	{
		string run_from, run_to;
		clear_flags();

		size_t argidx;
		for (argidx = 1; argidx < args.size(); argidx++) {
			if (args[argidx] == "-family" && argidx + 1 < args.size()) {
				family_opt = args[++argidx];
				continue;
			}
			if (args[argidx] == "-top" && argidx + 1 < args.size()) {
				top_opt = "-top " + args[++argidx];
				continue;
			}
			if (args[argidx] == "-vqm" && argidx + 1 < args.size()) {
				vout_file = args[++argidx];
				log_warning("The Quartus backend has not been tested recently and is likely incompatible with modern versions of Quartus.\n");
				continue;
			}
			if (args[argidx] == "-vpr" && argidx + 1 < args.size()) {
				blif_file = 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] == "-iopads") {
				iopads = true;
				continue;
			}
			if (args[argidx] == "-dff") {
				dff = true;
				continue;
			}
			if (args[argidx] == "-nodsp") {
				nodsp = true;
				continue;
			}
			if (args[argidx] == "-nobram") {
				nobram = true;
				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 command only operates on fully selected designs!\n");

		if (family_opt == "cyclonev")
			log_cmd_error("Cyclone V synthesis has been moved to synth_intel_alm.\n");

		if (family_opt != "max10" &&
		    family_opt != "cycloneiv" &&
		    family_opt != "cycloneive" &&
		    family_opt != "cyclone10lp")
			log_cmd_error("Invalid or no family specified: '%s'\n", family_opt);

		log_header(design, "Executing SYNTH_INTEL pass.\n");
		log_push();

		run_script(design, run_from, run_to);

		log_pop();
	}

	void script() override
	{
		if (check_label("begin")) {
			if (check_label("family"))
				run(stringf("read_verilog -sv -lib +/intel/%s/cells_sim.v", family_opt));

			// Misc and common cells
			run("read_verilog -sv -lib +/intel/common/m9k_bb.v");
			run("read_verilog -sv -lib +/intel/common/altpll_bb.v");
			run(stringf("hierarchy -check %s", help_mode ? "-top <top>" : top_opt));
		}

		if (check_label("coarse")) {
			run("proc");
			if (flatten || help_mode)
				run("flatten", "(skip if -noflatten)");
                        run("tribuf -logic");
			run("deminout");
			run("opt_expr");
			run("opt_clean");
			run("check");
			run("opt -nodffe -nosdff");
			run("fsm");
			run("opt");
			run("wreduce");
			run("peepopt");
			run("opt_clean");
			run("techmap -map +/cmp2lut.v -D LUT_WIDTH=4");
			run("opt_expr");
			run("opt_clean");

			if (help_mode) {
				run("techmap -map +mul2dsp.v [...]", "(unless -nodsp)");
			} else if (!nodsp) {
				run("techmap -map +/mul2dsp.v -D DSP_A_MAXWIDTH=18 -D DSP_B_MAXWIDTH=18  -D DSP_A_MINWIDTH=10 -D DSP_B_MINWIDTH=4 -D DSP_NAME=$__MUL18X18");
					run("chtype -set $mul t:$__soft_mul");
					run("techmap -map +/mul2dsp.v -D DSP_A_MAXWIDTH=18 -D DSP_B_MAXWIDTH=18  -D DSP_A_MINWIDTH=4 -D DSP_B_MINWIDTH=10 -D DSP_NAME=$__MUL18X18");
					run("chtype -set $mul t:$__soft_mul");
					run("techmap -map +/mul2dsp.v -D DSP_A_MAXWIDTH=9 -D DSP_B_MAXWIDTH=9  -D DSP_A_MINWIDTH=4 -D DSP_B_MINWIDTH=4 -D DSP_NAME=$__MUL9X9");
					run("chtype -set $mul t:$__soft_mul");
				run("alumacc");
				run(stringf("techmap -map +/intel/%s/dsp_map.v", family_opt));
			} else {
				run("alumacc");
			}
			run("opt");
			run("memory -nomap");
			run("opt_clean");
		}

		if (!nobram && check_label("map_bram", "(skip if -nobram)")) {
				if (family_opt == "cycloneiv" ||
				    family_opt == "cycloneive" ||
				    family_opt == "max10" ||
				    help_mode) {
				run("memory_bram -rules +/intel/common/brams_m9k.txt", "(if applicable for family)");
				run("techmap -map +/intel/common/brams_map_m9k.v", "(if applicable for family)");
			} else {
				log_warning("BRAM mapping is not currently supported for %s.\n", family_opt);
			}
		}

		if (check_label("map_ffram")) {
			run("opt -fast -mux_undef -undriven -fine -full");
			run("memory_map");
			run("opt -undriven -fine");
			run("techmap -map +/techmap.v");
			run("opt -full");
			run("clean -purge");
			run("setundef -undriven -zero");
			if (retime || help_mode)
				run("abc -markgroups -dff -D 1", "(only if -retime)");
		}

		if (check_label("map_ffs")) {
			run("dfflegalize -cell $_DFFE_PN0P_ 01");
			run("techmap -map +/intel/common/ff_map.v");
		}

		if (check_label("map_luts")) {
			run("abc9 -lut 4 -W 300" + string(dff ? " -dff" : ""));
			run("clean");
			run("opt -fast");
			run("autoname");
			run("clean");
		}

		if (check_label("map_cells")) {
			if (iopads || help_mode)
				run("iopadmap -bits -outpad $__outpad I:O -inpad $__inpad O:I", "(if -iopads)");
			run(stringf("techmap -map +/intel/%s/cells_map.v", family_opt));
			run("clean -purge");
		}

		if (check_label("check")) {
			run("hierarchy -check");
			run("stat");
			run("check -noinit");
			run("blackbox =A:whitebox");
		}

		if (check_label("vqm")) {
			if (!vout_file.empty() || help_mode)
				run(stringf("write_verilog -attr2comment -defparam -nohex -decimal -renameprefix syn_ %s",
					    help_mode ? "<file-name>" : vout_file.c_str()));
		}

		if (check_label("vpr")) {
			if (!blif_file.empty() || help_mode) {
				run(stringf("opt_clean -purge"));
				run(stringf("write_blif %s", help_mode ? "<file-name>" : blif_file));
			}
		}
	}
} SynthIntelPass;

PRIVATE_NAMESPACE_END