112 lines
3.9 KiB
C++
112 lines
3.9 KiB
C++
/*
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* nextpnr -- Next Generation Place and Route
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*
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* Copyright (C) 2018 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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static bool is_nextpnr_iob(Context *ctx, CellInfo *cell)
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{
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return cell->type == ctx->id("$nextpnr_ibuf") || cell->type == ctx->id("$nextpnr_obuf") ||
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cell->type == ctx->id("$nextpnr_iobuf");
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}
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class Ecp5Packer
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{
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public:
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Ecp5Packer(Context *ctx) : ctx(ctx){};
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private:
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// Simple "packer" to remove nextpnr IOBUFs, this assumes IOBUFs are manually instantiated
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void pack_io(Context *ctx)
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{
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std::unordered_set<IdString> packed_cells;
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std::vector<std::unique_ptr<CellInfo>> new_cells;
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log_info("Packing IOs..\n");
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for (auto cell : sorted(ctx->cells)) {
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CellInfo *ci = cell.second;
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if (is_nextpnr_iob(ctx, ci)) {
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CellInfo *trio = nullptr;
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if (ci->type == ctx->id("$nextpnr_ibuf") || ci->type == ctx->id("$nextpnr_iobuf")) {
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trio = net_only_drives(ctx, ci->ports.at(ctx->id("O")).net, is_trellis_io, ctx->id("B"), true, ci);
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} else if (ci->type == ctx->id("$nextpnr_obuf")) {
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trio = net_only_drives(ctx, ci->ports.at(ctx->id("I")).net, is_trellis_io, ctx->id("B"), true, ci);
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}
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if (trio != nullptr) {
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// Trivial case, TRELLIS_IO used. Just destroy the net and the
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// iobuf
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log_info("%s feeds TRELLIS_IO %s, removing %s %s.\n", ci->name.c_str(ctx), trio->name.c_str(ctx),
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ci->type.c_str(ctx), ci->name.c_str(ctx));
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NetInfo *net = trio->ports.at(ctx->id("B")).net;
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if (net != nullptr) {
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ctx->nets.erase(net->name);
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trio->ports.at(ctx->id("B")).net = nullptr;
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}
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if (ci->type == ctx->id("$nextpnr_iobuf")) {
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NetInfo *net2 = ci->ports.at(ctx->id("I")).net;
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if (net2 != nullptr) {
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ctx->nets.erase(net2->name);
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}
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}
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} else {
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log_error("TRELLIS_IO required on all top level IOs...\n");
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}
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packed_cells.insert(ci->name);
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std::copy(ci->attrs.begin(), ci->attrs.end(), std::inserter(trio->attrs, trio->attrs.begin()));
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}
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}
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for (auto pcell : packed_cells) {
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ctx->cells.erase(pcell);
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}
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for (auto &ncell : new_cells) {
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ctx->cells[ncell->name] = std::move(ncell);
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}
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}
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public:
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void pack() { pack_io(ctx); }
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private:
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Context *ctx;
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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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try {
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log_break();
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Ecp5Packer(ctx).pack();
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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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