140 lines
5.2 KiB
C++
140 lines
5.2 KiB
C++
/*
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* nextpnr -- Next Generation Place and Route
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*
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* Copyright (C) 2019 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 "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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void add_port(const Context *ctx, CellInfo *cell, std::string name, PortType dir)
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{
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IdString id = ctx->id(name);
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NPNR_ASSERT(cell->ports.count(id) == 0);
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cell->ports[id] = PortInfo{id, nullptr, dir};
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}
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std::unique_ptr<CellInfo> create_generic_cell(Context *ctx, IdString type, std::string name)
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{
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static int auto_idx = 0;
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std::unique_ptr<CellInfo> new_cell = std::unique_ptr<CellInfo>(new CellInfo());
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if (name.empty()) {
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new_cell->name = ctx->id("$nextpnr_" + type.str(ctx) + "_" + std::to_string(auto_idx++));
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} else {
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new_cell->name = ctx->id(name);
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}
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new_cell->type = type;
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if (type == ctx->id("GENERIC_SLICE")) {
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new_cell->params[ctx->id("K")] = std::to_string(ctx->args.K);
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new_cell->params[ctx->id("INIT")] = "0";
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new_cell->params[ctx->id("FF_USED")] = "0";
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for (int i = 0; i < ctx->args.K; i++)
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add_port(ctx, new_cell.get(), "I[" + std::to_string(i) + "]", PORT_IN);
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add_port(ctx, new_cell.get(), "CLK", PORT_IN);
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add_port(ctx, new_cell.get(), "Q", PORT_OUT);
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} else if (type == ctx->id("GENERIC_IOB")) {
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new_cell->params[ctx->id("INPUT_USED")] = "0";
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new_cell->params[ctx->id("OUTPUT_USED")] = "0";
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new_cell->params[ctx->id("ENABLE_USED")] = "0";
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add_port(ctx, new_cell.get(), "PAD", PORT_INOUT);
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add_port(ctx, new_cell.get(), "I", PORT_IN);
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add_port(ctx, new_cell.get(), "EN", PORT_IN);
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add_port(ctx, new_cell.get(), "O", PORT_OUT);
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} else {
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log_error("unable to create generic cell of type %s", type.c_str(ctx));
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}
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return new_cell;
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}
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void lut_to_lc(const Context *ctx, CellInfo *lut, CellInfo *lc, bool no_dff)
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{
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lc->params[ctx->id("INIT")] = lut->params[ctx->id("INIT")];
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int lut_k = int_or_default(lut->params, ctx->id("K"), 4);
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NPNR_ASSERT(lut_k <= ctx->args.K);
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for (int i = 0; i < lut_k; i++) {
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IdString port = ctx->id("I[" + std::to_string(i) + "]");
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replace_port(lut, port, lc, port);
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}
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if (no_dff) {
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replace_port(lut, ctx->id("Q"), lc, ctx->id("Q"));
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lc->params[ctx->id("FF_USED")] = "0";
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}
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}
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void dff_to_lc(const Context *ctx, CellInfo *dff, CellInfo *lc, bool pass_thru_lut)
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{
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lc->params[ctx->id("FF_USED")] = "1";
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replace_port(dff, ctx->id("CLK"), lc, ctx->id("CLK"));
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if (pass_thru_lut) {
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lc->params[ctx->id("INIT")] = "2";
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replace_port(dff, ctx->id("D"), lc, ctx->id("I[0]"));
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}
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replace_port(dff, ctx->id("Q"), lc, ctx->id("Q"));
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}
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void nxio_to_iob(Context *ctx, CellInfo *nxio, CellInfo *iob, std::unordered_set<IdString> &todelete_cells)
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{
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if (nxio->type == ctx->id("$nextpnr_ibuf")) {
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iob->params[ctx->id("INPUT_USED")] = "1";
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replace_port(nxio, ctx->id("O"), iob, ctx->id("O"));
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} else if (nxio->type == ctx->id("$nextpnr_obuf")) {
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iob->params[ctx->id("OUTPUT_USED")] = "1";
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replace_port(nxio, ctx->id("I"), iob, ctx->id("I"));
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} else if (nxio->type == ctx->id("$nextpnr_iobuf")) {
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// N.B. tristate will be dealt with below
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iob->params[ctx->id("INPUT_USED")] = "1";
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iob->params[ctx->id("OUTPUT_USED")] = "1";
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replace_port(nxio, ctx->id("I"), iob, ctx->id("I"));
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replace_port(nxio, ctx->id("O"), iob, ctx->id("O"));
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} else {
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NPNR_ASSERT(false);
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}
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NetInfo *donet = iob->ports.at(ctx->id("I")).net;
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CellInfo *tbuf = net_driven_by(
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ctx, donet, [](const Context *ctx, const CellInfo *cell) { return cell->type == ctx->id("$_TBUF_"); },
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ctx->id("Y"));
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if (tbuf) {
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iob->params[ctx->id("ENABLE_USED")] = "1";
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replace_port(tbuf, ctx->id("A"), iob, ctx->id("I"));
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replace_port(tbuf, ctx->id("E"), iob, ctx->id("EN"));
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if (donet->users.size() > 1) {
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for (auto user : donet->users)
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log_info(" remaining tristate user: %s.%s\n", user.cell->name.c_str(ctx), user.port.c_str(ctx));
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log_error("unsupported tristate IO pattern for IO buffer '%s', "
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"instantiate GENERIC_IOB manually to ensure correct behaviour\n",
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nxio->name.c_str(ctx));
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}
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ctx->nets.erase(donet->name);
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todelete_cells.insert(tbuf->name);
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}
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}
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NEXTPNR_NAMESPACE_END
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