mirror of
https://github.com/YosysHQ/yosys
synced 2025-10-31 03:32:29 +00:00
135 lines
4.1 KiB
C++
135 lines
4.1 KiB
C++
/*
|
|
* yosys -- Yosys Open SYnthesis Suite
|
|
*
|
|
* Copyright (C) 2012 Claire Xenia Wolf <claire@yosyshq.com>
|
|
* Copyright (C) 2019 gatecat <gatecat@ds0.me>
|
|
*
|
|
* 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 "kernel/yosys.h"
|
|
#include "kernel/sigtools.h"
|
|
|
|
USING_YOSYS_NAMESPACE
|
|
PRIVATE_NAMESPACE_BEGIN
|
|
|
|
struct LatticeGsrPass : public Pass {
|
|
LatticeGsrPass() : Pass("lattice_gsr", "Lattice: handle GSR") { }
|
|
void help() override
|
|
{
|
|
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
|
|
log("\n");
|
|
log(" lattice_gsr [options] [selection]\n");
|
|
log("\n");
|
|
log("Trim active low async resets connected to GSR and resolve GSR parameter,\n");
|
|
log("if a GSR or SGSR primitive is used in the design.\n");
|
|
log("\n");
|
|
log("If any cell has the GSR parameter set to \"AUTO\", this will be resolved\n");
|
|
log("to \"ENABLED\" if a GSR primitive is present and the (* nogsr *) attribute\n");
|
|
log("is not set, otherwise it will be resolved to \"DISABLED\".\n");
|
|
log("\n");
|
|
}
|
|
void execute(std::vector<std::string> args, RTLIL::Design *design) override
|
|
{
|
|
log_header(design, "Executing LATTICE_GSR pass (implement FF init values).\n");
|
|
|
|
size_t argidx;
|
|
for (argidx = 1; argidx < args.size(); argidx++)
|
|
{
|
|
// if (args[argidx] == "-singleton") {
|
|
// singleton_mode = true;
|
|
// continue;
|
|
// }
|
|
break;
|
|
}
|
|
extra_args(args, argidx, design);
|
|
|
|
for (auto module : design->selected_modules())
|
|
{
|
|
log("Handling GSR in %s.\n", log_id(module));
|
|
|
|
SigMap sigmap(module);
|
|
|
|
SigBit gsr;
|
|
bool found_gsr = false;
|
|
|
|
for (auto cell : module->selected_cells())
|
|
{
|
|
if (cell->type != ID(GSR) && cell->type != ID(SGSR))
|
|
continue;
|
|
if (found_gsr)
|
|
log_error("Found more than one GSR or SGSR cell in module %s.\n", log_id(module));
|
|
found_gsr = true;
|
|
SigSpec sig_gsr = cell->getPort(ID(GSR));
|
|
if (GetSize(sig_gsr) < 1)
|
|
log_error("GSR cell %s has disconnected GSR input.\n", log_id(cell));
|
|
gsr = sigmap(sig_gsr[0]);
|
|
}
|
|
|
|
// Resolve GSR parameter
|
|
|
|
for (auto cell : module->selected_cells())
|
|
{
|
|
if (!cell->hasParam(ID(GSR)) || cell->getParam(ID(GSR)).decode_string() != "AUTO")
|
|
continue;
|
|
|
|
bool gsren = found_gsr;
|
|
if (cell->get_bool_attribute(ID(nogsr)))
|
|
gsren = false;
|
|
cell->setParam(ID(GSR), gsren ? Const("ENABLED") : Const("DISABLED"));
|
|
|
|
}
|
|
|
|
if (!found_gsr)
|
|
continue;
|
|
|
|
// For finding active low FF inputs
|
|
pool<SigBit> inverted_gsr;
|
|
|
|
log_debug("GSR net in module %s is %s.\n", log_id(module), log_signal(gsr));
|
|
for (auto cell : module->selected_cells())
|
|
{
|
|
if (cell->type != ID($_NOT_))
|
|
continue;
|
|
SigSpec sig_a = cell->getPort(ID::A), sig_y = cell->getPort(ID::Y);
|
|
if (GetSize(sig_a) < 1 || GetSize(sig_y) < 1)
|
|
continue;
|
|
SigBit a = sigmap(sig_a[0]);
|
|
if (a == gsr)
|
|
inverted_gsr.insert(sigmap(sig_y[0]));
|
|
}
|
|
|
|
for (auto cell : module->selected_cells())
|
|
{
|
|
if (cell->type != ID(TRELLIS_FF))
|
|
continue;
|
|
if (cell->getParam(ID(GSR)).decode_string() != "ENABLED")
|
|
continue;
|
|
if (cell->getParam(ID(SRMODE)).decode_string() != "ASYNC")
|
|
continue;
|
|
SigSpec sig_lsr = cell->getPort(ID(LSR));
|
|
if (GetSize(sig_lsr) < 1)
|
|
continue;
|
|
SigBit lsr = sigmap(sig_lsr[0]);
|
|
if (!inverted_gsr.count(lsr))
|
|
continue;
|
|
cell->setParam(ID(SRMODE), Const("LSR_OVER_CE"));
|
|
cell->unsetPort(ID(LSR));
|
|
}
|
|
|
|
}
|
|
}
|
|
} LatticeGsrPass;
|
|
|
|
PRIVATE_NAMESPACE_END
|