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/*
* nextpnr -- Next Generation Place and Route
*
* Copyright (C) 2018 Clifford Wolf <clifford@clifford.at>
*
* 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 "arch_place.h"
NEXTPNR_NAMESPACE_BEGIN
static const NetInfo *
get_net_or_nullptr(const CellInfo *cell, const IdString port)
{
auto found = cell->ports.find(port);
if (found != cell->ports.end())
return found->second.net;
else
return nullptr;
};
static bool logicCellsCompatible(const std::vector<const CellInfo *> &cells)
{
bool dffs_exist = false, dffs_neg = false;
const NetInfo *cen = nullptr, *clk = nullptr, *sr = nullptr;
std::unordered_set<const NetInfo *> locals;
for (auto cell : cells) {
if (std::stoi(cell->params.at("DFF_ENABLE"))) {
if (!dffs_exist) {
dffs_exist = true;
cen = get_net_or_nullptr(cell, "CEN");
clk = get_net_or_nullptr(cell, "CLK");
sr = get_net_or_nullptr(cell, "SR");
locals.insert(cen);
locals.insert(clk);
locals.insert(sr);
if (std::stoi(cell->params.at("NEG_CLK"))) {
dffs_neg = true;
}
} else {
if (cen != get_net_or_nullptr(cell, "CEN"))
return false;
if (clk != get_net_or_nullptr(cell, "CLK"))
return false;
if (sr != get_net_or_nullptr(cell, "CEN"))
return false;
if (dffs_neg != bool(std::stoi(cell->params.at("NEG_CLK"))))
return false;
}
}
locals.insert(get_net_or_nullptr(cell, "I0"));
locals.insert(get_net_or_nullptr(cell, "I1"));
locals.insert(get_net_or_nullptr(cell, "I2"));
locals.insert(get_net_or_nullptr(cell, "I3"));
}
locals.erase(nullptr); // disconnected signals don't use local tracks
return locals.size() <= 32;
}
bool isValidBelForCell(Design *design, CellInfo *cell, BelId bel)
{
const Chip &chip = design->chip;
if (cell->type == "ICESTORM_LC") {
assert(chip.getBelType(bel) == TYPE_ICESTORM_LC);
std::vector<const CellInfo *> cells;
for (auto bel_other : chip.getBelsAtSameTile(bel)) {
IdString cell_other = chip.getBelCell(bel_other, false);
if (cell_other != IdString()) {
const CellInfo *ci_other = design->cells[cell_other];
cells.push_back(ci_other);
}
}
cells.push_back(cell);
return logicCellsCompatible(cells);
} else {
// TODO: IO cell clock checks
return true;
}
}
NEXTPNR_NAMESPACE_END
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