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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 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 "kernel/yosys.h"
#include "kernel/sigtools.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
struct ZinitPass : public Pass {
ZinitPass() : Pass("zinit", "add inverters so all FF are zero-initialized") { }
virtual void help()
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" zinit [options] [selection]\n");
log("\n");
log("Add inverters as needed to make all FFs zero-initialized.\n");
log("\n");
log(" -all\n");
log(" also add zero initialization to uninitialized FFs\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
bool all_mode = false;
log_header(design, "Executing ZINIT pass (make all FFs zero-initialized).\n");
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
if (args[argidx] == "-singleton") {
all_mode = true;
continue;
}
break;
}
extra_args(args, argidx, design);
for (auto module : design->selected_modules())
{
SigMap sigmap(module);
dict<SigBit, State> initbits;
pool<SigBit> donebits;
for (auto wire : module->selected_wires())
{
if (wire->attributes.count("\\init") == 0)
continue;
SigSpec wirebits = sigmap(wire);
Const initval = wire->attributes.at("\\init");
wire->attributes.erase("\\init");
for (int i = 0; i < GetSize(wirebits) && i < GetSize(initval); i++)
{
SigBit bit = wirebits[i];
State val = initval[i];
if (val != State::S0 && val != State::S1 && bit.wire != nullptr)
continue;
if (initbits.count(bit)) {
if (initbits.at(bit) != val)
log_error("Conflicting init values for signal %s (%s = %s != %s).\n",
log_signal(bit), log_signal(SigBit(wire, i)),
log_signal(val), log_signal(initbits.at(bit)));
continue;
}
initbits[bit] = val;
}
}
pool<IdString> dff_types = {
"$ff", "$dff", "$dffe", "$dffsr", "$adff",
"$_FF_", "$_DFFE_NN_", "$_DFFE_NP_", "$_DFFE_PN_", "$_DFFE_PP_",
"$_DFFSR_NNN_", "$_DFFSR_NNP_", "$_DFFSR_NPN_", "$_DFFSR_NPP_",
"$_DFFSR_PNN_", "$_DFFSR_PNP_", "$_DFFSR_PPN_", "$_DFFSR_PPP_",
"$_DFF_N_", "$_DFF_NN0_", "$_DFF_NN1_", "$_DFF_NP0_", "$_DFF_NP1_",
"$_DFF_P_", "$_DFF_PN0_", "$_DFF_PN1_", "$_DFF_PP0_", "$_DFF_PP1_"
};
for (auto cell : module->selected_cells())
{
if (!dff_types.count(cell->type))
continue;
SigSpec sig_d = sigmap(cell->getPort("\\D"));
SigSpec sig_q = sigmap(cell->getPort("\\Q"));
if (GetSize(sig_d) < 1 || GetSize(sig_q) < 1)
continue;
Const initval;
for (int i = 0; i < GetSize(sig_q); i++) {
if (initbits.count(sig_q[i])) {
initval.bits.push_back(initbits.at(sig_q[i]));
donebits.insert(sig_q[i]);
} else
initval.bits.push_back(all_mode ? State::S0 : State::Sx);
}
Wire *initwire = module->addWire(NEW_ID, GetSize(initval));
initwire->attributes["\\init"] = initval;
for (int i = 0; i < GetSize(initwire); i++)
if (initval.bits.at(i) == State::S1)
{
sig_d[i] = module->NotGate(NEW_ID, sig_d[i]);
module->addNotGate(NEW_ID, SigSpec(initwire, i), sig_q[i]);
initwire->attributes["\\init"].bits.at(i) = State::S0;
}
else
{
module->connect(sig_q[i], SigSpec(initwire, i));
}
log("FF init value for cell %s (%s): %s = %s\n", log_id(cell), log_id(cell->type),
log_signal(sig_q), log_signal(initval));
cell->setPort("\\D", sig_d);
cell->setPort("\\Q", initwire);
}
for (auto &it : initbits)
if (donebits.count(it.first) == 0)
log_error("Failed to handle init bit %s = %s.\n", log_signal(it.first), log_signal(it.second));
}
}
} ZinitPass;
PRIVATE_NAMESPACE_END
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