From c388cebf7f530129d91a2a99936116a258c168d1 Mon Sep 17 00:00:00 2001
From: gatecat <gatecat@ds0.me>
Date: Thu, 25 Mar 2021 16:39:24 +0000
Subject: nexus: Add support for get_pins PDC command
Signed-off-by: gatecat <gatecat@ds0.me>
---
nexus/pdc.cc | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 56 insertions(+), 7 deletions(-)
diff --git a/nexus/pdc.cc b/nexus/pdc.cc
index 4aef354c..1ffe0a64 100644
--- a/nexus/pdc.cc
+++ b/nexus/pdc.cc
@@ -32,32 +32,55 @@ struct TCLEntity
ENTITY_CELL,
ENTITY_PORT,
ENTITY_NET,
+ ENTITY_PIN,
} type;
IdString name;
+ IdString pin; // for cell pins only
TCLEntity(EntityType type, IdString name) : type(type), name(name) {}
+ TCLEntity(EntityType type, IdString name, IdString pin) : type(type), name(name), pin(pin) {}
const std::string &to_string(Context *ctx) { return name.str(ctx); }
- CellInfo *get_cell(Context *ctx)
+ CellInfo *get_cell(Context *ctx) const
{
if (type != ENTITY_CELL)
return nullptr;
return ctx->cells.at(name).get();
}
- PortInfo *get_port(Context *ctx)
+ PortInfo *get_port(Context *ctx) const
{
if (type != ENTITY_PORT)
return nullptr;
return &ctx->ports.at(name);
}
- NetInfo *get_net(Context *ctx)
+ NetInfo *get_net(Context *ctx) const
{
- if (type != ENTITY_NET)
+ if (type == ENTITY_PIN) {
+ CellInfo *cell = nullptr;
+ if (ctx->cells.count(name)) {
+ cell = ctx->cells.at(name).get();
+ } else {
+ const std::string &n = name.str(ctx);
+ auto pos = n.rfind('.');
+ if (pos == std::string::npos)
+ return nullptr;
+ // remove one hierarchy layer due to Radiant weirdness around PLLs etc
+ IdString stripped_name = ctx->id(n.substr(0, pos));
+ if (!ctx->cells.count(stripped_name))
+ return nullptr;
+ cell = ctx->cells.at(stripped_name).get();
+ }
+ if (!cell->ports.count(pin))
+ return nullptr;
+ return cell->ports.at(pin).net;
+ } else if (type == ENTITY_NET) {
+ return ctx->nets.at(name).get();
+ } else {
return nullptr;
- return ctx->nets.at(name).get();
+ }
}
};
@@ -201,6 +224,8 @@ struct PDCParser
return cmd_get_cells(arguments);
else if (cmd == "get_nets")
return cmd_get_nets(arguments);
+ else if (cmd == "get_pins")
+ return cmd_get_pins(arguments);
else if (cmd == "create_clock")
return cmd_create_clock(arguments);
else if (cmd == "ldc_set_location")
@@ -286,6 +311,28 @@ struct PDCParser
return cells;
}
+ TCLValue cmd_get_pins(const std::vector<TCLValue> &arguments)
+ {
+ std::vector<TCLEntity> pins;
+ for (int i = 1; i < int(arguments.size()); i++) {
+ auto &arg = arguments.at(i);
+ if (!arg.is_string)
+ log_error("get_pins expected string arguments (line %d)\n", lineno);
+ std::string s = arg.str;
+ if (s.at(0) == '-')
+ log_error("unsupported argument '%s' to get_pins (line %d)\n", s.c_str(), lineno);
+ auto pos = s.rfind('/');
+ if (pos == std::string::npos)
+ log_error("expected / in cell pin name '%s' (line %d)\n", s.c_str(), lineno);
+ pins.emplace_back(TCLEntity::ENTITY_PIN, ctx->id(s.substr(0, pos)), ctx->id(s.substr(pos + 1)));
+ if (pins.back().get_net(ctx) == nullptr) {
+ log_warning("cell pin '%s' not found\n", s.c_str());
+ pins.pop_back();
+ }
+ }
+ return pins;
+ }
+
TCLValue cmd_create_clock(const std::vector<TCLValue> &arguments)
{
float period = 10;
@@ -311,12 +358,14 @@ struct PDCParser
} else {
for (const auto &ety : arg.list) {
NetInfo *net = nullptr;
- if (ety.type == TCLEntity::ENTITY_NET)
+ if (ety.type == TCLEntity::ENTITY_PIN)
+ net = ety.get_net(ctx);
+ else if (ety.type == TCLEntity::ENTITY_NET)
net = ctx->nets.at(ety.name).get();
else if (ety.type == TCLEntity::ENTITY_PORT)
net = ctx->ports.at(ety.name).net;
else
- log_error("create_clock applies only to cells or IO ports (line %d)\n", lineno);
+ log_error("create_clock applies only to cells, cell pins, or IO ports (line %d)\n", lineno);
ctx->addClock(net->name, 1000.0f / period);
}
}
--
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