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yosys/passes/pmgen/xilinx_srl.cc

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/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
* (C) 2019 Eddie Hung <eddie@fpgeh.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 "kernel/yosys.h"
#include "kernel/sigtools.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
// for peepopt_pm
bool did_something;
#include "passes/pmgen/xilinx_srl_pm.h"
#include "passes/pmgen/peepopt_pm.h"
void run_fixed(xilinx_srl_pm &pm)
{
auto &st = pm.st_fixed;
auto &ud = pm.ud_fixed;
auto param_def = [&ud](Cell *cell, IdString param) {
auto def = ud.default_params.at(std::make_pair(cell->type,param));
return cell->parameters.at(param, def);
};
log("Found fixed chain of length %d (%s):\n", GetSize(ud.longest_chain), log_id(st.first->type));
auto first_cell = ud.longest_chain.back();
SigSpec initval;
for (auto cell : ud.longest_chain) {
log_debug(" %s\n", log_id(cell));
if (cell->type.in(ID($_DFF_N_), ID($_DFF_P_), ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_))) {
SigBit Q = cell->getPort(ID(Q));
log_assert(Q.wire);
auto it = Q.wire->attributes.find(ID(init));
if (it != Q.wire->attributes.end()) {
auto &i = it->second[Q.offset];
initval.append(i);
i = State::Sx;
}
else
initval.append(State::Sx);
}
else if (cell->type.in(ID(FDRE), ID(FDRE_1)))
initval.append(param_def(cell, ID(INIT)));
else
log_abort();
if (cell != first_cell)
pm.autoremove(cell);
}
auto last_cell = ud.longest_chain.front();
Cell *c = pm.module->addCell(NEW_ID, ID($__XILINX_SHREG_));
pm.module->swap_names(c, first_cell);
if (first_cell->type.in(ID($_DFF_N_), ID($_DFF_P_), ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_), ID(FDRE), ID(FDRE_1))) {
c->setParam(ID(DEPTH), GetSize(ud.longest_chain));
c->setParam(ID(INIT), initval.as_const());
if (first_cell->type.in(ID($_DFF_P_), ID($_DFFE_PN_), ID($_DFFE_PP_)))
c->setParam(ID(CLKPOL), 1);
else if (first_cell->type.in(ID($_DFF_N_), ID($DFFE_NN_), ID($_DFFE_NP_), ID(FDRE_1)))
c->setParam(ID(CLKPOL), 0);
else if (first_cell->type.in(ID(FDRE)))
c->setParam(ID(CLKPOL), param_def(first_cell, ID(IS_C_INVERTED)).as_bool() ? 0 : 1);
else
log_abort();
if (first_cell->type.in(ID($_DFFE_NP_), ID($_DFFE_PP_)))
c->setParam(ID(ENPOL), 1);
else if (first_cell->type.in(ID($_DFFE_NN_), ID($_DFFE_PN_)))
c->setParam(ID(ENPOL), 0);
else
c->setParam(ID(ENPOL), 2);
c->setPort(ID(C), first_cell->getPort(ID(C)));
c->setPort(ID(D), first_cell->getPort(ID(D)));
c->setPort(ID(Q), last_cell->getPort(ID(Q)));
c->setPort(ID(L), GetSize(ud.longest_chain)-1);
if (first_cell->type.in(ID($_DFF_N_), ID($_DFF_P_)))
c->setPort(ID(E), State::S1);
else if (first_cell->type.in(ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_)))
c->setPort(ID(E), first_cell->getPort(ID(E)));
else if (first_cell->type.in(ID(FDRE), ID(FDRE_1)))
c->setPort(ID(E), first_cell->getPort(ID(CE)));
else
log_abort();
}
else
log_abort();
log(" -> %s (%s)\n", log_id(c), log_id(c->type));
}
void run_variable(xilinx_srl_pm &pm)
{
auto &st = pm.st_variable;
auto &ud = pm.ud_variable;
log("Found variable chain of length %d (%s):\n", GetSize(ud.chain), log_id(st.first->type));
auto first_cell = ud.chain.back().first;
auto first_slice = ud.chain.back().second;
SigSpec initval;
for (const auto &i : ud.chain) {
auto cell = i.first;
auto slice = i.second;
log_debug(" %s\n", log_id(cell));
if (cell->type.in(ID($_DFF_N_), ID($_DFF_P_), ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_), ID($dff), ID($dffe))) {
SigBit Q = cell->getPort(ID(Q))[slice];
log_assert(Q.wire);
auto it = Q.wire->attributes.find(ID(init));
if (it != Q.wire->attributes.end()) {
auto &i = it->second[Q.offset];
initval.append(i);
i = State::Sx;
}
else
initval.append(State::Sx);
}
else
log_abort();
if (cell != first_cell)
cell->connections_.at(ID(Q))[slice] = pm.module->addWire(NEW_ID);
}
pm.autoremove(st.shiftx);
Cell *c = pm.module->addCell(NEW_ID, ID($__XILINX_SHREG_));
pm.module->swap_names(c, first_cell);
if (first_cell->type.in(ID($_DFF_N_), ID($_DFF_P_), ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_), ID($dff), ID($dffe))) {
c->setParam(ID(DEPTH), GetSize(ud.chain));
c->setParam(ID(INIT), initval.as_const());
Const clkpol, enpol;
if (first_cell->type.in(ID($_DFF_P_), ID($_DFFE_PN_), ID($_DFFE_PP_)))
clkpol = 1;
else if (first_cell->type.in(ID($_DFF_N_), ID($DFFE_NN_), ID($_DFFE_NP_)))
clkpol = 0;
else if (first_cell->type.in(ID($dff), ID($dffe)))
clkpol = first_cell->getParam(ID(CLK_POLARITY));
else
log_abort();
if (first_cell->type.in(ID($_DFFE_NP_), ID($_DFFE_PP_)))
enpol = 1;
else if (first_cell->type.in(ID($_DFFE_NN_), ID($_DFFE_PN_)))
enpol = 0;
else if (first_cell->type.in(ID($dffe)))
enpol = first_cell->getParam(ID(EN_POLARITY));
else
enpol = 2;
c->setParam(ID(CLKPOL), clkpol);
c->setParam(ID(ENPOL), enpol);
if (first_cell->type.in(ID($_DFF_N_), ID($_DFF_P_), ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_)))
c->setPort(ID(C), first_cell->getPort(ID(C)));
else if (first_cell->type.in(ID($dff), ID($dffe)))
c->setPort(ID(C), first_cell->getPort(ID(CLK)));
else
log_abort();
c->setPort(ID(D), first_cell->getPort(ID(D))[first_slice]);
c->setPort(ID(Q), st.shiftx->getPort(ID(Y)));
c->setPort(ID(L), st.shiftx->getPort(ID(B)));
if (first_cell->type.in(ID($_DFF_N_), ID($_DFF_P_), ID($dff)))
c->setPort(ID(E), State::S1);
else if (first_cell->type.in(ID($_DFFE_NN_), ID($_DFFE_NP_), ID($_DFFE_PN_), ID($_DFFE_PP_)))
c->setPort(ID(E), first_cell->getPort(ID(E)));
else if (first_cell->type.in(ID($dffe)))
c->setPort(ID(E), first_cell->getPort(ID(EN)));
else
log_abort();
}
else
log_abort();
log(" -> %s (%s)\n", log_id(c), log_id(c->type));
}
struct XilinxSrlPass : public Pass {
XilinxSrlPass() : Pass("xilinx_srl", "Xilinx shift register extraction") { }
void help() YS_OVERRIDE
{
// |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
log("\n");
log(" xilinx_srl [options] [selection]\n");
log("\n");
log("This pass converts chains of built-in flops (bit-level: $_DFF_[NP]_, $_DFFE_*\n");
log("and word-level: $dff, $dffe) as well as Xilinx flops (FDRE, FDRE_1) into a\n");
log("$__XILINX_SHREG cell. Chains must be of the same cell type, clock, clock polarity,\n");
log("enable, and enable polarity (where relevant).\n");
log("Flops with resets cannot be mapped to Xilinx devices and will not be inferred.");
log("\n");
log(" -minlen N\n");
log(" min length of shift register (default = 3)\n");
log("\n");
log(" -fixed\n");
log(" infer fixed-length shift registers.\n");
log("\n");
log(" -variable\n");
log(" infer variable-length shift registers (i.e. fixed-length shifts where\n");
log(" each element also fans-out to a $shiftx cell).\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
{
log_header(design, "Executing XILINX_SRL pass (Xilinx shift register extraction).\n");
bool fixed = false;
bool variable = false;
int minlen = 3;
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
if (args[argidx] == "-minlen" && argidx+1 < args.size()) {
minlen = atoi(args[++argidx].c_str());
continue;
}
if (args[argidx] == "-fixed") {
fixed = true;
continue;
}
if (args[argidx] == "-variable") {
variable = true;
continue;
}
break;
}
extra_args(args, argidx, design);
if (!fixed && !variable)
log_cmd_error("'-fixed' and/or '-variable' must be specified.\n");
for (auto module : design->selected_modules()) {
auto pm = xilinx_srl_pm(module, module->selected_cells());
pm.ud_fixed.minlen = minlen;
pm.ud_variable.minlen = minlen;
if (fixed) {
// TODO: How to get these automatically?
pm.ud_fixed.default_params[std::make_pair(ID(FDRE),ID(INIT))] = State::S0;
pm.ud_fixed.default_params[std::make_pair(ID(FDRE),ID(IS_C_INVERTED))] = State::S0;
pm.ud_fixed.default_params[std::make_pair(ID(FDRE),ID(IS_D_INVERTED))] = State::S0;
pm.ud_fixed.default_params[std::make_pair(ID(FDRE),ID(IS_R_INVERTED))] = State::S0;
pm.run_fixed(run_fixed);
}
if (variable)
pm.run_variable(run_variable);
}
}
} XilinxSrlPass;
PRIVATE_NAMESPACE_END
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