117 lines
3.8 KiB
C++
117 lines
3.8 KiB
C++
/*
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* nextpnr -- Next Generation Place and Route
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*
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* Copyright (C) 2018-19 David Shah <david@symbioticeda.com>
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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 <algorithm>
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#include <iterator>
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#include <unordered_set>
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#include "cells.h"
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#include "design_utils.h"
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#include "log.h"
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#include "util.h"
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NEXTPNR_NAMESPACE_BEGIN
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// Merge a net into a constant net
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static void set_net_constant(const Context *ctx, NetInfo *orig, NetInfo *constnet, bool constval)
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{
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(void) constval;
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orig->driver.cell = nullptr;
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for (auto user : orig->users) {
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if (user.cell != nullptr) {
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CellInfo *uc = user.cell;
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if (ctx->verbose)
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log_info("%s user %s\n", orig->name.c_str(ctx), uc->name.c_str(ctx));
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uc->ports[user.port].net = constnet;
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constnet->users.push_back(user);
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}
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}
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orig->users.clear();
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}
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// Pack constants (based on simple implementation in generic).
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// VCC/GND cells provided by nextpnr automatically.
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static void pack_constants(Context *ctx)
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{
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log_info("Packing constants..\n");
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std::unique_ptr<CellInfo> const_cell = create_machxo2_cell(ctx, id_FACADE_SLICE, "$PACKER_CONST");
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const_cell->params[id_LUT0_INITVAL] = Property(0, 16);
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const_cell->params[id_LUT1_INITVAL] = Property(0xFFFF, 16);
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std::unique_ptr<NetInfo> gnd_net = std::unique_ptr<NetInfo>(new NetInfo);
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gnd_net->name = ctx->id("$PACKER_GND_NET");
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gnd_net->driver.cell = const_cell.get();
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gnd_net->driver.port = id_F0;
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const_cell->ports.at(id_F0).net = gnd_net.get();
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std::unique_ptr<NetInfo> vcc_net = std::unique_ptr<NetInfo>(new NetInfo);
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vcc_net->name = ctx->id("$PACKER_VCC_NET");
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vcc_net->driver.cell = const_cell.get();
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vcc_net->driver.port = id_F1;
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const_cell->ports.at(id_F1).net = vcc_net.get();
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std::vector<IdString> dead_nets;
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for (auto net : sorted(ctx->nets)) {
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NetInfo *ni = net.second;
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if (ni->driver.cell != nullptr && ni->driver.cell->type == ctx->id("GND")) {
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IdString drv_cell = ni->driver.cell->name;
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set_net_constant(ctx, ni, gnd_net.get(), false);
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dead_nets.push_back(net.first);
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ctx->cells.erase(drv_cell);
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} else if (ni->driver.cell != nullptr && ni->driver.cell->type == ctx->id("VCC")) {
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IdString drv_cell = ni->driver.cell->name;
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set_net_constant(ctx, ni, vcc_net.get(), true);
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dead_nets.push_back(net.first);
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ctx->cells.erase(drv_cell);
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}
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}
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ctx->cells[const_cell->name] = std::move(const_cell);
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ctx->nets[gnd_net->name] = std::move(gnd_net);
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ctx->nets[vcc_net->name] = std::move(vcc_net);
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for (auto dn : dead_nets) {
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ctx->nets.erase(dn);
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}
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}
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// Main pack function
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bool Arch::pack()
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{
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Context *ctx = getCtx();
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log_info("Packing implementation goes here..");
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try {
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log_break();
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pack_constants(ctx);
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ctx->settings[ctx->id("pack")] = 1;
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ctx->assignArchInfo();
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log_info("Checksum: 0x%08x\n", ctx->checksum());
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return true;
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} catch (log_execution_error_exception) {
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return false;
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}
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}
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NEXTPNR_NAMESPACE_END
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