nexus: Add packing framework
Signed-off-by: David Shah <dave@ds0.me>
This commit is contained in:
David Shah
parent
eb15463406
commit
2c49f812d9
@ -376,14 +376,6 @@ bool Arch::getBudgetOverride(const NetInfo *net_info, const PortRef &sink, delay
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// -----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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bool Arch::pack()
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{
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// FIXME
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getCtx()->attrs[getCtx()->id("step")] = std::string("pack");
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archInfoToAttributes();
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return true;
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}
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bool Arch::place()
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bool Arch::place()
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{
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{
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std::string placer = str_or_default(settings, id("placer"), defaultPlacer);
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std::string placer = str_or_default(settings, id("placer"), defaultPlacer);
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175
nexus/pack.cc
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175
nexus/pack.cc
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@ -0,0 +1,175 @@
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/*
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* nextpnr -- Next Generation Place and Route
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*
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* Copyright (C) 2020 David Shah <dave@ds0.me>
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*
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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*/
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#include "design_utils.h"
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#include "log.h"
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#include "nextpnr.h"
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#include "util.h"
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NEXTPNR_NAMESPACE_BEGIN
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struct NexusPacker
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{
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Context *ctx;
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// Generic cell transformation
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// Given cell name map and port map
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// If port name is not found in port map; it will be copied as-is but stripping []
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struct XFormRule
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{
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IdString new_type;
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std::unordered_map<IdString, IdString> port_xform;
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std::unordered_map<IdString, std::vector<IdString>> port_multixform;
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std::unordered_map<IdString, IdString> param_xform;
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std::vector<std::pair<IdString, std::string>> set_attrs;
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std::vector<std::pair<IdString, Property>> set_params;
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};
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void xform_cell(const std::unordered_map<IdString, XFormRule> &rules, CellInfo *ci)
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{
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auto &rule = rules.at(ci->type);
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ci->type = rule.new_type;
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std::vector<IdString> orig_port_names;
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for (auto &port : ci->ports)
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orig_port_names.push_back(port.first);
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for (auto pname : orig_port_names) {
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if (rule.port_multixform.count(pname)) {
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auto old_port = ci->ports.at(pname);
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disconnect_port(ctx, ci, pname);
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ci->ports.erase(pname);
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for (auto new_name : rule.port_multixform.at(pname)) {
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ci->ports[new_name].name = new_name;
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ci->ports[new_name].type = old_port.type;
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connect_port(ctx, old_port.net, ci, new_name);
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}
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} else {
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IdString new_name;
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if (rule.port_xform.count(pname)) {
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new_name = rule.port_xform.at(pname);
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} else {
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std::string stripped_name;
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for (auto c : pname.str(ctx))
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if (c != '[' && c != ']')
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stripped_name += c;
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new_name = ctx->id(stripped_name);
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}
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if (new_name != pname) {
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rename_port(ctx, ci, pname, new_name);
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}
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}
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}
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std::vector<IdString> xform_params;
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for (auto ¶m : ci->params)
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if (rule.param_xform.count(param.first))
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xform_params.push_back(param.first);
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for (auto param : xform_params)
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ci->params[rule.param_xform.at(param)] = ci->params[param];
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for (auto &attr : rule.set_attrs)
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ci->attrs[attr.first] = attr.second;
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for (auto ¶m : rule.set_params)
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ci->params[param.first] = param.second;
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}
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void generic_xform(const std::unordered_map<IdString, XFormRule> &rules, bool print_summary = false)
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{
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std::map<std::string, int> cell_count;
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std::map<std::string, int> new_types;
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for (auto cell : sorted(ctx->cells)) {
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CellInfo *ci = cell.second;
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if (rules.count(ci->type)) {
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cell_count[ci->type.str(ctx)]++;
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xform_cell(rules, ci);
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new_types[ci->type.str(ctx)]++;
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}
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}
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if (print_summary) {
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for (auto &nt : new_types) {
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log_info(" Created %d %s cells from:\n", nt.second, nt.first.c_str());
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for (auto &cc : cell_count) {
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if (rules.at(ctx->id(cc.first)).new_type != ctx->id(nt.first))
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continue;
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log_info(" %6dx %s\n", cc.second, cc.first.c_str());
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}
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}
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}
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}
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void pack_luts()
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{
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log_info("Packing LUTs...\n");
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std::unordered_map<IdString, XFormRule> lut_rules;
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lut_rules[id_LUT4].new_type = id_OXIDE_COMB;
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lut_rules[id_LUT4].port_xform[id_Z] = id_F;
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generic_xform(lut_rules);
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}
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void pack_ffs()
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{
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log_info("Packing FFs...\n");
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std::unordered_map<IdString, XFormRule> ff_rules;
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for (auto type : {id_FD1P3BX, id_FD1P3DX, id_FD1P3IX, id_FD1P3JX}) {
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ff_rules[type].new_type = id_OXIDE_FF;
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ff_rules[type].port_xform[id_CK] = id_CLK;
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ff_rules[type].port_xform[id_D] = id_M; // will be rerouted to DI later if applicable
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ff_rules[type].port_xform[id_SP] = id_CE;
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ff_rules[type].port_xform[id_Q] = id_Q;
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}
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// Async preload
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ff_rules[id_FD1P3BX].set_params.emplace_back(id_SRMODE, std::string("ASYNC"));
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ff_rules[id_FD1P3BX].set_params.emplace_back(id_REGSET, std::string("SET"));
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ff_rules[id_FD1P3BX].port_xform[id_PD] = id_LSR;
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// Async clear
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ff_rules[id_FD1P3DX].set_params.emplace_back(id_SRMODE, std::string("ASYNC"));
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ff_rules[id_FD1P3DX].set_params.emplace_back(id_REGSET, std::string("RESET"));
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ff_rules[id_FD1P3DX].port_xform[id_CD] = id_LSR;
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// Sync preload
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ff_rules[id_FD1P3JX].set_params.emplace_back(id_SRMODE, std::string("LSR_OVER_CE"));
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ff_rules[id_FD1P3JX].set_params.emplace_back(id_REGSET, std::string("SET"));
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ff_rules[id_FD1P3JX].port_xform[id_PD] = id_LSR;
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// Sync clear
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ff_rules[id_FD1P3IX].set_params.emplace_back(id_SRMODE, std::string("LSR_OVER_CE"));
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ff_rules[id_FD1P3IX].set_params.emplace_back(id_REGSET, std::string("RESET"));
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ff_rules[id_FD1P3IX].port_xform[id_CD] = id_LSR;
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generic_xform(ff_rules, true);
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}
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explicit NexusPacker(Context *ctx) : ctx(ctx) {}
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void operator()()
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{
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pack_ffs();
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pack_luts();
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}
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};
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bool Arch::pack()
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{
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(NexusPacker(getCtx()))();
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attrs[id("step")] = std::string("pack");
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archInfoToAttributes();
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return true;
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}
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NEXTPNR_NAMESPACE_END
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