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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 David Shah <david@symbioticeda.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include "cells.h"
#include "design_utils.h"
#include "log.h"
#include "nextpnr.h"
#include "timing.h"
#include "util.h"
NEXTPNR_NAMESPACE_BEGIN
inline NetInfo *port_or_nullptr(const CellInfo *cell, IdString name)
{
auto found = cell->ports.find(name);
if (found == cell->ports.end())
return nullptr;
return found->second.net;
}
bool Arch::slicesCompatible(const std::vector<const CellInfo *> &cells) const
{
// TODO: allow different LSR/CLK and MUX/SRMODE settings once
// routing details are worked out
IdString clk_sig, lsr_sig;
IdString CLKMUX, LSRMUX, SRMODE;
bool first = true;
for (auto cell : cells) {
if (cell->sliceInfo.using_dff) {
if (first) {
clk_sig = cell->sliceInfo.clk_sig;
lsr_sig = cell->sliceInfo.lsr_sig;
CLKMUX = cell->sliceInfo.clkmux;
LSRMUX = cell->sliceInfo.lsrmux;
SRMODE = cell->sliceInfo.srmode;
} else {
if (cell->sliceInfo.clk_sig != clk_sig)
return false;
if (cell->sliceInfo.lsr_sig != lsr_sig)
return false;
if (cell->sliceInfo.clkmux != CLKMUX)
return false;
if (cell->sliceInfo.lsrmux != LSRMUX)
return false;
if (cell->sliceInfo.srmode != SRMODE)
return false;
}
first = false;
}
}
return true;
}
bool Arch::isBelLocationValid(BelId bel) const
{
if (getBelType(bel) == id_TRELLIS_SLICE) {
std::vector<const CellInfo *> bel_cells;
Loc bel_loc = getBelLocation(bel);
for (auto bel_other : getBelsByTile(bel_loc.x, bel_loc.y)) {
CellInfo *cell_other = getBoundBelCell(bel_other);
if (cell_other != nullptr) {
bel_cells.push_back(cell_other);
}
}
if (getBoundBelCell(bel) != nullptr && getBoundBelCell(bel)->sliceInfo.has_l6mux && ((bel_loc.z % 2) == 1))
return false;
return slicesCompatible(bel_cells);
} else {
CellInfo *cell = getBoundBelCell(bel);
if (cell == nullptr)
return true;
else
return isValidBelForCell(cell, bel);
}
}
bool Arch::isValidBelForCell(CellInfo *cell, BelId bel) const
{
if (cell->type == id_TRELLIS_SLICE) {
NPNR_ASSERT(getBelType(bel) == id_TRELLIS_SLICE);
std::vector<const CellInfo *> bel_cells;
Loc bel_loc = getBelLocation(bel);
if (cell->sliceInfo.has_l6mux && ((bel_loc.z % 2) == 1))
return false;
for (auto bel_other : getBelsByTile(bel_loc.x, bel_loc.y)) {
CellInfo *cell_other = getBoundBelCell(bel_other);
if (cell_other != nullptr && bel_other != bel) {
bel_cells.push_back(cell_other);
}
}
bel_cells.push_back(cell);
return slicesCompatible(bel_cells);
} else if (cell->type == id_DCUA || cell->type == id_EXTREFB || cell->type == id_PCSCLKDIV) {
return args.type != ArchArgs::LFE5U_25F && args.type != ArchArgs::LFE5U_45F && args.type != ArchArgs::LFE5U_85F;
} else {
// other checks
return true;
}
}
void Arch::permute_luts()
{
NetCriticalityMap nc;
get_criticalities(getCtx(), &nc);
std::unordered_map<PortInfo *, size_t> port_to_user;
for (auto net : sorted(nets)) {
NetInfo *ni = net.second;
for (size_t i = 0; i < ni->users.size(); i++) {
auto &usr = ni->users.at(i);
port_to_user[&(usr.cell->ports.at(usr.port))] = i;
}
}
auto proc_lut = [&](CellInfo *ci, int lut) {
std::vector<IdString> port_names;
for (int i = 0; i < 4; i++)
port_names.push_back(id(std::string("ABCD").substr(i, 1) + std::to_string(lut)));
std::vector<std::pair<float, int>> inputs;
std::vector<NetInfo *> orig_nets;
for (int i = 0; i < 4; i++) {
auto &port = ci->ports.at(port_names.at(i));
float crit = 0;
if (port.net != nullptr && nc.count(port.net->name)) {
auto &n = nc.at(port.net->name);
size_t usr = port_to_user.at(&port);
if (usr < n.criticality.size())
crit = n.criticality.at(usr);
}
orig_nets.push_back(port.net);
inputs.emplace_back(crit, i);
}
// Least critical first (A input is slowest)
std::sort(inputs.begin(), inputs.end());
for (int i = 0; i < 4; i++) {
IdString p = port_names.at(i);
// log_info("%s %s %f\n", p.c_str(ctx), port_names.at(inputs.at(i).second).c_str(ctx), inputs.at(i).first);
disconnect_port(getCtx(), ci, p);
ci->ports.at(p).net = nullptr;
if (orig_nets.at(inputs.at(i).second) != nullptr) {
connect_port(getCtx(), orig_nets.at(inputs.at(i).second), ci, p);
ci->params[id(p.str(this) + "MUX")] = p.str(this);
} else {
ci->params[id(p.str(this) + "MUX")] = "1";
}
}
// Rewrite function
int old_init = int_or_default(ci->params, id("LUT" + std::to_string(lut) + "_INITVAL"), 0);
int new_init = 0;
for (int i = 0; i < 16; i++) {
int old_index = 0;
for (int k = 0; k < 4; k++) {
if (i & (1 << k))
old_index |= (1 << inputs.at(k).second);
}
if (old_init & (1 << old_index))
new_init |= (1 << i);
}
ci->params[id("LUT" + std::to_string(lut) + "_INITVAL")] = std::to_string(new_init);
};
for (auto cell : sorted(cells)) {
CellInfo *ci = cell.second;
if (ci->type == id_TRELLIS_SLICE && str_or_default(ci->params, id("MODE"), "LOGIC") == "LOGIC") {
proc_lut(ci, 0);
proc_lut(ci, 1);
}
}
}
NEXTPNR_NAMESPACE_END
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