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Added support for bus interfaces to "read_liberty -lib"

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This commit is contained in:
Clifford Wolf 2016-09-18 18:48:59 +02:00
parent 0ead5a9e44
commit 13a03b84d4
1 changed files with 77 additions and 1 deletions
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78
frontends/liberty/liberty.cc
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@ -469,6 +469,46 @@ struct LibertyFrontend : public Frontend {
LibertyParser parser(*f);
int cell_count = 0;
std::map<std::string, std::tuple<int, int, bool>> type_map;
for (auto type_node : parser.ast->children)
{
if (type_node->id != "type" || type_node->args.size() != 1)
continue;
std::string type_name = type_node->args.at(0);
int bit_width = -1, bit_from = -1, bit_to = -1;
bool upto = false;
for (auto child : type_node->children)
{
if (child->id == "base_type" && child->value != "array")
goto next_type;
if (child->id == "data_type" && child->value != "bit")
goto next_type;
if (child->id == "bit_width")
bit_width = atoi(child->value.c_str());
if (child->id == "bit_from")
bit_from = atoi(child->value.c_str());
if (child->id == "bit_to")
bit_to = atoi(child->value.c_str());
if (child->id == "downto" && (child->value == "0" || child->value == "false" || child->value == "FALSE"))
upto = true;
}
if (bit_width != (std::max(bit_from, bit_to) - std::min(bit_from, bit_to) + 1))
log_error("Incompatible array type '%s': bit_width=%d, bit_from=%d, bit_to=%d.\n",
type_name.c_str(), bit_width, bit_from, bit_to);
type_map[type_name] = std::tuple<int, int, bool>(bit_width, std::min(bit_from, bit_to), upto);
next_type:;
}
for (auto cell : parser.ast->children)
{
if (cell->id != "cell" || cell->args.size() != 1)
@ -494,13 +534,14 @@ struct LibertyFrontend : public Frontend {
module->attributes[attr] = 1;
for (auto node : cell->children)
{
if (node->id == "pin" && node->args.size() == 1) {
LibertyAst *dir = node->find("direction");
if (!dir || (dir->value != "input" && dir->value != "output" && dir->value != "inout" && dir->value != "internal"))
{
if (!flag_ignore_miss_dir)
{
log_error("Missing or invalid direction for pin %s of cell %s.\n", node->args.at(0).c_str(), log_id(module->name));
log_error("Missing or invalid direction for pin %s on cell %s.\n", node->args.at(0).c_str(), log_id(module->name));
} else {
log("Ignoring cell %s with missing or invalid direction for pin %s.\n", log_id(module->name), node->args.at(0).c_str());
delete module;
@ -511,6 +552,41 @@ struct LibertyFrontend : public Frontend {
module->addWire(RTLIL::escape_id(node->args.at(0)));
}
if (node->id == "bus" && node->args.size() == 1)
{
if (!flag_lib)
log_error("Error in cell %s: bus interfaces are only supported in -lib mode.\n", log_id(cell_name));
LibertyAst *dir = node->find("direction");
if (!dir || (dir->value != "input" && dir->value != "output" && dir->value != "inout" && dir->value != "internal"))
log_error("Missing or invalid direction for bus %s on cell %s.\n", node->args.at(0).c_str(), log_id(module->name));
if (dir->value == "internal")
continue;
LibertyAst *bus_type_node = node->find("bus_type");
if (!bus_type_node || !type_map.count(bus_type_node->value))
log_error("Unkown or unsupported type for bus interface %s on cell %s.\n",
node->args.at(0).c_str(), log_id(cell_name));
int bus_type_width = std::get<0>(type_map.at(bus_type_node->value));
int bus_type_offset = std::get<1>(type_map.at(bus_type_node->value));
bool bus_type_upto = std::get<2>(type_map.at(bus_type_node->value));
Wire *wire = module->addWire(RTLIL::escape_id(node->args.at(0)), bus_type_width);
wire->start_offset = bus_type_offset;
wire->upto = bus_type_upto;
if (dir->value == "input" || dir->value == "inout")
wire->port_input = true;
if (dir->value == "output" || dir->value == "inout")
wire->port_output = true;
}
}
for (auto node : cell->children)
{
if (!flag_lib) {