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yosys/techlibs/nexus/synth_nexus.cc

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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2020 gatecat <gatecat@ds0.me>
*
* 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 SynthNexusPass : public ScriptPass
{
SynthNexusPass() : ScriptPass("synth_nexus", "synthesis for Lattice Nexus FPGAs") { }
void on_register() override
{
RTLIL::constpad["synth_nexus.abc9.W"] = "300";
}
void help() override
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" synth_nexus [options]\n");
log("\n");
log("This command runs synthesis for Lattice Nexus FPGAs.\n");
log("\n");
log(" -top <module>\n");
log(" use the specified module as top module\n");
log("\n");
log(" -family <device>\n");
log(" run synthesis for the specified Nexus device\n");
log(" supported values: lifcl, lfd2nx\n");
log("\n");
log(" -json <file>\n");
log(" write the design to the specified JSON file. writing of an output file\n");
log(" is omitted if this parameter is not specified.\n");
log("\n");
log(" -vm <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(" -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(" -dff\n");
log(" run 'abc'/'abc9' with -dff option\n");
log("\n");
log(" -retime\n");
log(" run 'abc' with '-dff -D 1' options\n");
log("\n");
log(" -noccu2\n");
log(" do not use CCU2 cells in output netlist\n");
log("\n");
log(" -nodffe\n");
log(" do not use flipflops with CE in output netlist\n");
log("\n");
log(" -nolram\n");
log(" do not use large RAM cells in output netlist\n");
log(" note that large RAM must be explicitly requested with a (* lram *)\n");
log(" attribute on the memory.\n");
log("\n");
log(" -nobram\n");
log(" do not use block RAM cells in output netlist\n");
log("\n");
log(" -nolutram\n");
log(" do not use LUT RAM cells in output netlist\n");
log("\n");
log(" -nowidelut\n");
log(" do not use PFU muxes to implement LUTs larger than LUT4s\n");
log("\n");
log(" -noiopad\n");
log(" do not insert IO buffers\n");
log("\n");
log(" -nodsp\n");
log(" do not infer DSP multipliers\n");
log("\n");
log(" -abc9\n");
log(" use new ABC9 flow (EXPERIMENTAL)\n");
log("\n");
log("The following commands are executed by this synthesis command:\n");
help_script();
log("\n");
}
string top_opt, json_file, vm_file, family;
bool noccu2, nodffe, nolram, nobram, nolutram, nowidelut, noiopad, nodsp, flatten, dff, retime, abc9;
void clear_flags() override
{
top_opt = "-auto-top";
family = "lifcl";
json_file = "";
vm_file = "";
noccu2 = false;
nodffe = false;
nolram = false;
nobram = false;
nolutram = false;
nowidelut = false;
noiopad = false;
nodsp = false;
flatten = true;
dff = false;
retime = 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] == "-top" && argidx+1 < args.size()) {
top_opt = "-top " + args[++argidx];
continue;
}
if (args[argidx] == "-json" && argidx+1 < args.size()) {
json_file = args[++argidx];
continue;
}
if (args[argidx] == "-vm" && argidx+1 < args.size()) {
vm_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] == "-family") && argidx+1 < args.size()) {
family = args[++argidx];
continue;
}
if (args[argidx] == "-flatten") {
flatten = true;
continue;
}
if (args[argidx] == "-noflatten") {
flatten = false;
continue;
}
if (args[argidx] == "-dff") {
dff = true;
continue;
}
if (args[argidx] == "-nodsp") {
nodsp = true;
continue;
}
if (args[argidx] == "-retime") {
retime = true;
continue;
}
if (args[argidx] == "-noccu2") {
noccu2 = true;
continue;
}
if (args[argidx] == "-nodffe") {
nodffe = true;
continue;
}
if (args[argidx] == "-nolram") {
nolram = true;
continue;
}
if (args[argidx] == "-nobram") {
nobram = true;
continue;
}
if (args[argidx] == "-nolutram") {
nolutram = true;
continue;
}
if (args[argidx] == "-nowidelut") {
nowidelut = true;
continue;
}
if (args[argidx] == "-noiopad") {
noiopad = true;
continue;
}
if (args[argidx] == "-abc9") {
abc9 = 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 (abc9 && retime)
log_cmd_error("-retime option not currently compatible with -abc9!\n");
log_header(design, "Executing SYNTH_NEXUS pass.\n");
log_push();
run_script(design, run_from, run_to);
log_pop();
}
struct DSPRule {
int a_maxwidth;
int b_maxwidth;
int a_minwidth;
int b_minwidth;
std::string prim;
};
const std::vector<DSPRule> dsp_rules = {
{36, 36, 22, 22, "$__NX_MUL36X36"},
{36, 18, 22, 10, "$__NX_MUL36X18"},
{18, 18, 10, 4, "$__NX_MUL18X18"},
{18, 18, 4, 10, "$__NX_MUL18X18"},
{ 9, 9, 4, 4, "$__NX_MUL9X9"},
};
void script() override
{
if (family != "lifcl" && family != "lfd2nx")
log_cmd_error("Invalid Nexus -family setting: '%s'.\n", family.c_str());
if (check_label("begin"))
{
run("read_verilog -lib -specify +/nexus/cells_sim.v +/nexus/cells_xtra.v");
run(stringf("hierarchy -check %s", help_mode ? "-top <top>" : top_opt.c_str()));
}
if (check_label("coarse"))
{
run("proc");
if (flatten || help_mode)
run("flatten");
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("share");
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)");
run("techmap -map +/nexus/dsp_map.v", "(unless -nodsp)");
} else if (!nodsp) {
for (const auto &rule : dsp_rules) {
run(stringf("techmap -map +/mul2dsp.v -D DSP_A_MAXWIDTH=%d -D DSP_B_MAXWIDTH=%d -D DSP_A_MINWIDTH=%d -D DSP_B_MINWIDTH=%d -D DSP_NAME=%s",
rule.a_maxwidth, rule.b_maxwidth, rule.a_minwidth, rule.b_minwidth, rule.prim.c_str()));
run("chtype -set $mul t:$__soft_mul");
}
run("techmap -map +/nexus/dsp_map.v");
}
run("alumacc");
run("opt");
run("memory -nomap");
run("opt_clean");
}
if (!nolram && check_label("map_lram", "(skip if -nolram)"))
{
run("memory_bram -rules +/nexus/lrams.txt");
run("setundef -zero -params t:$__NX_PDPSC512K");
run("techmap -map +/nexus/lrams_map.v");
}
if (!nobram && check_label("map_bram", "(skip if -nobram)"))
{
run("memory_bram -rules +/nexus/brams.txt");
run("setundef -zero -params t:$__NX_PDP16K");
run("techmap -map +/nexus/brams_map.v");
}
if (!nolutram && check_label("map_lutram", "(skip if -nolutram)"))
{
run("memory_bram -rules +/nexus/lutrams.txt");
run("setundef -zero -params t:$__NEXUS_DPR16X4");
run("techmap -map +/nexus/lutrams_map.v");
}
if (check_label("map_ffram"))
{
run("opt -fast -mux_undef -undriven -fine");
run("memory_map -iattr -attr !ram_block -attr !rom_block -attr logic_block "
"-attr syn_ramstyle=auto -attr syn_ramstyle=registers "
"-attr syn_romstyle=auto -attr syn_romstyle=logic");
run("opt -undriven -fine");
}
if (check_label("map_gates"))
{
if (noccu2)
run("techmap");
else
run("techmap -map +/techmap.v -map +/nexus/arith_map.v");
if (help_mode || !noiopad)
run("iopadmap -bits -outpad OB I:O -inpad IB O:I -toutpad OBZ ~T:I:O -tinoutpad BB ~T:O:I:B A:top", "(skip if '-noiopad')");
run("opt -fast");
if (retime || help_mode)
run("abc -dff -D 1", "(only if -retime)");
}
if (check_label("map_ffs"))
{
run("opt_clean");
std::string dfflegalize_args = " -cell $_DFF_P_ 01 -cell $_DFF_PP?_ r -cell $_SDFF_PP?_ r -cell $_DLATCH_?_ x";
if (help_mode) {
dfflegalize_args += " [-cell $_DFFE_PP_ 01 -cell $_DFFE_PP?P_ r -cell $_SDFFE_PP?P_ r]";
} else if (!nodffe) {
dfflegalize_args += " -cell $_DFFE_PP_ 01 -cell $_DFFE_PP?P_ r -cell $_SDFFE_PP?P_ r";
}
run("dfflegalize" + dfflegalize_args, "($_*DFFE_* only if not -nodffe)");
if ((abc9 && dff) || help_mode)
run("zinit -all w:* t:$_DFF_?_ t:$_DFFE_??_ t:$_SDFF*", "(only if -abc9 and -dff");
run("techmap -D NO_LUT -map +/nexus/cells_map.v");
run("opt_expr -undriven -mux_undef");
run("simplemap");
run("attrmvcp -copy -attr syn_useioff");
run("opt_clean");
}
if (check_label("map_luts"))
{
run("techmap -map +/nexus/latches_map.v");
if (abc9) {
std::string abc9_opts;
if (nowidelut)
abc9_opts += " -maxlut 4";
std::string k = "synth_nexus.abc9.W";
if (active_design && active_design->scratchpad.count(k))
abc9_opts += stringf(" -W %s", active_design->scratchpad_get_string(k).c_str());
else
abc9_opts += stringf(" -W %s", RTLIL::constpad.at(k).c_str());
if (nowidelut)
abc9_opts += " -maxlut 4";
if (dff)
abc9_opts += " -dff";
run("abc9" + abc9_opts);
} else {
std::string abc_args = " -dress";
if (nowidelut)
abc_args += " -lut 4";
else
abc_args += " -lut 4:5";
if (dff)
abc_args += " -dff";
run("abc" + abc_args);
}
run("clean");
}
if (check_label("map_cells"))
{
run("techmap -map +/nexus/cells_map.v");
// This is needed for Radiant, but perhaps not optimal for nextpnr...
run("setundef -zero");
run("hilomap -singleton -hicell VHI Z -locell VLO Z");
run("clean");
}
if (check_label("check"))
{
run("autoname");
run("hierarchy -check");
run("stat");
run("check -noinit");
run("blackbox =A:whitebox");
}
if (check_label("json"))
{
if (!json_file.empty() || help_mode)
run(stringf("write_json %s", help_mode ? "<file-name>" : json_file.c_str()));
}
if (check_label("vm"))
{
if (!vm_file.empty() || help_mode)
run(stringf("write_verilog %s", help_mode ? "<file-name>" : vm_file.c_str()));
}
}
} SynthNexusPass;
PRIVATE_NAMESPACE_END
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