143 lines
4.9 KiB
C++
143 lines
4.9 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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* Copyright (C) 2020 Pepijn de Vos <pepijn@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 <iostream>
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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, IdString id, PortType dir)
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{
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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 == id_SLICE) {
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new_cell->params[id_INIT] = 0;
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new_cell->params[id_FF_USED] = 0;
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new_cell->params[id_FF_TYPE] = id_DFF.str(ctx);
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IdString names[4] = {id_A, id_B, id_C, id_D};
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for (int i = 0; i < 4; i++) {
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add_port(ctx, new_cell.get(), names[i], PORT_IN);
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}
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add_port(ctx, new_cell.get(), id_CLK, PORT_IN);
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add_port(ctx, new_cell.get(), id_F, PORT_OUT);
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add_port(ctx, new_cell.get(), id_Q, PORT_OUT);
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add_port(ctx, new_cell.get(), id_CE, PORT_IN);
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add_port(ctx, new_cell.get(), id_LSR, PORT_IN);
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} else if (type == id_IOB) {
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new_cell->params[id_INPUT_USED] = 0;
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new_cell->params[id_OUTPUT_USED] = 0;
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new_cell->params[id_ENABLE_USED] = 0;
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add_port(ctx, new_cell.get(), id_PAD, PORT_INOUT);
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add_port(ctx, new_cell.get(), id_I, PORT_IN);
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add_port(ctx, new_cell.get(), id_EN, PORT_IN);
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add_port(ctx, new_cell.get(), id_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[id_INIT] = lut->params[id_INIT];
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IdString sim_names[4] = {id_I0, id_I1, id_I2, id_I3};
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IdString wire_names[4] = {id_A, id_B, id_C, id_D};
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for (int i = 0; i < 4; i++) {
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replace_port(lut, sim_names[i], lc, wire_names[i]);
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}
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if (no_dff) {
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lc->params[id_FF_USED] = 0;
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replace_port(lut, id_F, lc, id_F);
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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[id_FF_USED] = 1;
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lc->params[id_FF_TYPE] = dff->type.str(ctx);
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replace_port(dff, id_CLK, lc, id_CLK);
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replace_port(dff, id_CE, lc, id_CE);
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replace_port(dff, id_SET, lc, id_LSR);
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replace_port(dff, id_RESET, lc, id_LSR);
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replace_port(dff, id_CLEAR, lc, id_LSR);
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replace_port(dff, id_PRESET, lc, id_LSR);
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if (pass_thru_lut) {
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// Fill LUT with alternating 10
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const int init_size = 1 << 4;
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std::string init;
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init.reserve(init_size);
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for (int i = 0; i < init_size; i += 2)
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init.append("10");
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lc->params[id_INIT] = Property::from_string(init);
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replace_port(dff, id_D, lc, id_A);
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}
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replace_port(dff, id_Q, lc, id_Q);
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}
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void gwio_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 == id_IBUF) {
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iob->params[id_INPUT_USED] = 1;
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replace_port(nxio, id_O, iob, id_O);
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} else if (nxio->type == id_OBUF) {
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iob->params[id_OUTPUT_USED] = 1;
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replace_port(nxio, id_I, iob, id_I);
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} else if (nxio->type == id_TBUF) {
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iob->params[id_ENABLE_USED] = 1;
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iob->params[id_OUTPUT_USED] = 1;
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replace_port(nxio, id_I, iob, id_I);
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replace_port(nxio, id_OEN, iob, id_OEN);
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} else if (nxio->type == id_IOBUF) {
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iob->params[id_ENABLE_USED] = 1;
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iob->params[id_INPUT_USED] = 1;
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iob->params[id_OUTPUT_USED] = 1;
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replace_port(nxio, id_I, iob, id_I);
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replace_port(nxio, id_O, iob, id_O);
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replace_port(nxio, id_OEN, iob, id_OEN);
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} else {
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NPNR_ASSERT(false);
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}
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}
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NEXTPNR_NAMESPACE_END
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