From 9647dc3c07039c49b9bcf5932050467ca451ceef Mon Sep 17 00:00:00 2001 From: Clifford Wolf Date: Wed, 4 May 2016 22:48:02 +0200 Subject: Added tristate buffer support to iopadmap --- passes/techmap/iopadmap.cc | 165 +++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 161 insertions(+), 4 deletions(-) (limited to 'passes') diff --git a/passes/techmap/iopadmap.cc b/passes/techmap/iopadmap.cc index a26891363..4acbf7c0d 100644 --- a/passes/techmap/iopadmap.cc +++ b/passes/techmap/iopadmap.cc @@ -17,9 +17,8 @@ * */ -#include "kernel/register.h" -#include "kernel/rtlil.h" -#include "kernel/log.h" +#include "kernel/yosys.h" +#include "kernel/sigtools.h" USING_YOSYS_NAMESPACE PRIVATE_NAMESPACE_BEGIN @@ -48,12 +47,23 @@ struct IopadmapPass : public Pass { log(" Map module input ports to the given cell type with the\n"); log(" given output port name. if a 2nd portname is given, the\n"); log(" signal is passed through the pad call, using the 2nd\n"); - log(" portname as input.\n"); + log(" portname as the port facing the module port.\n"); log("\n"); log(" -outpad [:]\n"); log(" -inoutpad [:]\n"); log(" Similar to -inpad, but for output and inout ports.\n"); log("\n"); + log(" -toutpad :[:]\n"); + log(" Merges $_TBUF_ cells into the output pad cell. This takes precedence\n"); + log(" over the other -outpad cell. The first portname is the enable input\n"); + log(" of the tristate driver.\n"); + log("\n"); + log(" -tinoutpad ::[:]\n"); + log(" Merges $_TBUF_ cells into the inout pad cell. This takes precedence\n"); + log(" over the other -inoutpad cell. The first portname is the enable input\n"); + log(" of the tristate driver and the 2nd portname is the internal output\n"); + log(" buffering the external signal.\n"); + log("\n"); log(" -widthparam \n"); log(" Use the specified parameter name to set the port width.\n"); log("\n"); @@ -65,6 +75,8 @@ struct IopadmapPass : public Pass { log(" are wider. (the default behavior is to create word-wide\n"); log(" buffers using -widthparam to set the word size on the cell.)\n"); log("\n"); + log("Tristate PADS (-toutpad, -tinoutpad) always operate in -bits mode.\n"); + log("\n"); } virtual void execute(std::vector args, RTLIL::Design *design) { @@ -73,6 +85,8 @@ struct IopadmapPass : public Pass { std::string inpad_celltype, inpad_portname, inpad_portname2; std::string outpad_celltype, outpad_portname, outpad_portname2; std::string inoutpad_celltype, inoutpad_portname, inoutpad_portname2; + std::string toutpad_celltype, toutpad_portname, toutpad_portname2, toutpad_portname3; + std::string tinoutpad_celltype, tinoutpad_portname, tinoutpad_portname2, tinoutpad_portname3, tinoutpad_portname4; std::string widthparam, nameparam; bool flag_bits = false; @@ -98,6 +112,21 @@ struct IopadmapPass : public Pass { split_portname_pair(inoutpad_portname, inoutpad_portname2); continue; } + if (arg == "-toutpad" && argidx+2 < args.size()) { + toutpad_celltype = args[++argidx]; + toutpad_portname = args[++argidx]; + split_portname_pair(toutpad_portname, toutpad_portname2); + split_portname_pair(toutpad_portname2, toutpad_portname3); + continue; + } + if (arg == "-tinoutpad" && argidx+2 < args.size()) { + tinoutpad_celltype = args[++argidx]; + tinoutpad_portname = args[++argidx]; + split_portname_pair(tinoutpad_portname, tinoutpad_portname2); + split_portname_pair(tinoutpad_portname2, tinoutpad_portname3); + split_portname_pair(tinoutpad_portname3, tinoutpad_portname4); + continue; + } if (arg == "-widthparam" && argidx+1 < args.size()) { widthparam = args[++argidx]; continue; @@ -116,12 +145,132 @@ struct IopadmapPass : public Pass { for (auto module : design->selected_modules()) { + dict> skip_wires; + + if (!toutpad_celltype.empty() || !tinoutpad_celltype.empty()) + { + SigMap sigmap(module); + dict>> tbuf_bits; + + for (auto cell : module->cells()) + if (cell->type == "$_TBUF_") { + SigBit bit = sigmap(cell->getPort("\\Y").as_bit()); + tbuf_bits[bit].first = cell->name; + } + + for (auto cell : module->cells()) + for (auto port : cell->connections()) + for (auto bit : sigmap(port.second)) + if (tbuf_bits.count(bit)) + tbuf_bits.at(bit).second.insert(cell->name); + + for (auto wire : module->selected_wires()) + { + if (!wire->port_output) + continue; + + for (int i = 0; i < GetSize(wire); i++) + { + SigBit wire_bit(wire, i); + SigBit mapped_wire_bit = sigmap(wire_bit); + + if (tbuf_bits.count(mapped_wire_bit) == 0) + continue; + + auto &tbuf_cache = tbuf_bits.at(mapped_wire_bit); + Cell *tbuf_cell = module->cell(tbuf_cache.first); + + if (tbuf_cell == nullptr) + continue; + + SigBit en_sig = tbuf_cell->getPort("\\E").as_bit(); + SigBit data_sig = tbuf_cell->getPort("\\A").as_bit(); + + if (wire->port_input && !tinoutpad_celltype.empty()) + { + log("Mapping port %s.%s[%d] using %s.\n", log_id(module), log_id(wire), i, tinoutpad_celltype.c_str()); + + Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(tinoutpad_celltype)); + Wire *owire = module->addWire(NEW_ID); + + cell->setPort(RTLIL::escape_id(tinoutpad_portname), en_sig); + cell->setPort(RTLIL::escape_id(tinoutpad_portname2), owire); + cell->setPort(RTLIL::escape_id(tinoutpad_portname3), data_sig); + cell->setPort(RTLIL::escape_id(tinoutpad_portname4), wire_bit); + cell->attributes["\\keep"] = RTLIL::Const(1); + + for (auto cn : tbuf_cache.second) { + auto c = module->cell(cn); + if (c == nullptr) + continue; + for (auto port : c->connections()) { + SigSpec sig = port.second; + bool newsig = false; + for (auto &bit : sig) + if (sigmap(bit) == mapped_wire_bit) { + bit = owire; + newsig = true; + } + if (newsig) + c->setPort(port.first, sig); + } + } + + + module->remove(tbuf_cell); + skip_wires[wire->name].insert(i); + continue; + } + + if (!wire->port_input && !toutpad_celltype.empty()) + { + log("Mapping port %s.%s[%d] using %s.\n", log_id(module), log_id(wire), i, toutpad_celltype.c_str()); + + Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(toutpad_celltype)); + + cell->setPort(RTLIL::escape_id(toutpad_portname), en_sig); + cell->setPort(RTLIL::escape_id(toutpad_portname2), data_sig); + cell->setPort(RTLIL::escape_id(toutpad_portname3), wire_bit); + cell->attributes["\\keep"] = RTLIL::Const(1); + + for (auto cn : tbuf_cache.second) { + auto c = module->cell(cn); + if (c == nullptr) + continue; + for (auto port : c->connections()) { + SigSpec sig = port.second; + bool newsig = false; + for (auto &bit : sig) + if (sigmap(bit) == mapped_wire_bit) { + bit = data_sig; + newsig = true; + } + if (newsig) + c->setPort(port.first, sig); + } + } + + module->remove(tbuf_cell); + skip_wires[wire->name].insert(i); + continue; + } + } + } + } + for (auto wire : module->selected_wires()) { if (!wire->port_id) continue; std::string celltype, portname, portname2; + pool skip_bit_indices; + + if (skip_wires.count(wire->name)) { + if (!flag_bits) + continue; + skip_bit_indices = skip_wires.at(wire->name); + } if (wire->port_input && !wire->port_output) { if (inpad_celltype.empty()) { @@ -170,6 +319,14 @@ struct IopadmapPass : public Pass { { for (int i = 0; i < wire->width; i++) { + if (skip_bit_indices.count(i)) { + if (wire->port_output) + module->connect(SigSpec(new_wire, i), SigSpec(wire, i)); + else + module->connect(SigSpec(wire, i), SigSpec(new_wire, i)); + continue; + } + RTLIL::Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(celltype)); cell->setPort(RTLIL::escape_id(portname), RTLIL::SigSpec(wire, i)); if (!portname2.empty()) -- cgit v1.2.3