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frontend/son: Insert generic IO buffers for top level IO

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Signed-off-by: David Shah <davey1576@gmail.com>
This commit is contained in:
David Shah 2018-06-13 10:21:31 +02:00
parent a34c790b6a
commit ddf549b117
1 changed files with 30 additions and 4 deletions
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34
frontend/json/jsonparse.cc
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@ -622,7 +622,7 @@ void json_import_cell(Design *design, string modname, JsonNode *cell_node,
pr.cell = cell;
pr.port = name;
if (net != nullptr) {
if (type == PORT_IN) {
if (type == PORT_IN || type == PORT_INOUT) {
net->users.push_back(pr);
} else if (type == PORT_OUT) {
assert(net->driver.cell == nullptr);
@ -637,7 +637,7 @@ void json_import_cell(Design *design, string modname, JsonNode *cell_node,
}
static void insert_iobuf(Design *design, NetInfo *net, PortType type,
string name)
const string &name)
{
// Instantiate a architecture-independent IO buffer connected to a given
// net, of a given type, and named after the IO port.
@ -650,6 +650,7 @@ static void insert_iobuf(Design *design, NetInfo *net, PortType type,
std::copy(net->attrs.begin(), net->attrs.end(),
std::inserter(iobuf->attrs, iobuf->attrs.begin()));
if (type == PORT_IN) {
log_info("processing input port %s\n", name.c_str());
iobuf->type = "$nextpnr_ibuf";
iobuf->ports["O"] = PortInfo{"O", net, PORT_OUT};
@ -657,14 +658,16 @@ static void insert_iobuf(Design *design, NetInfo *net, PortType type,
net->driver.port = "O";
net->driver.cell = iobuf;
} else if (type == PORT_OUT) {
iobuf->type == "$nextpnr_obuf";
log_info("processing output port %s\n", name.c_str());
iobuf->type = "$nextpnr_obuf";
iobuf->ports["I"] = PortInfo{"I", net, PORT_IN};
PortRef ref;
ref.cell = iobuf;
ref.port = "I";
net->users.push_back(ref);
} else if (type == PORT_INOUT) {
iobuf->type == "$nextpnr_iobuf";
log_info("processing inout port %s\n", name.c_str());
iobuf->type = "$nextpnr_iobuf";
iobuf->ports["I"] = PortInfo{"I", nullptr, PORT_IN};
if (net->driver.cell != NULL) {
// Split the input and output nets for bidir ports
@ -690,6 +693,14 @@ static void insert_iobuf(Design *design, NetInfo *net, PortType type,
design->cells[iobuf->name] = iobuf;
}
void json_import_toplevel_port(Design *design, const string &modname, const string& portname, JsonNode *node) {
JsonNode *dir_node = node->data_dict.at("direction");
JsonNode *nets_node = node->data_dict.at("bits");
json_import_ports(design, modname, "Top Level IO", portname, dir_node, nets_node, [design](PortType type, const std::string &name, NetInfo *net){
insert_iobuf(design, net, type, name);
});
}
void json_import(Design *design, string modname, JsonNode *node)
{
if (is_blackbox(node))
@ -715,6 +726,21 @@ void json_import(Design *design, string modname, JsonNode *node)
}
}
if (node->data_dict.count("ports")) {
JsonNode *ports_parent = node->data_dict.at("ports");
// N.B. ports must be imported after cells for tristate behaviour
// to be correct
// Loop through all ports
for (int portid = 0; portid < GetSize(ports_parent->data_dict_keys);
portid++) {
JsonNode *here, *param_node;
here = ports_parent->data_dict.at(
ports_parent->data_dict_keys[portid]);
json_import_toplevel_port(design, modname, ports_parent->data_dict_keys[portid], here);
}
}
check_all_nets_driven(design);
}