[topgen] Change Pinmux IDs to Use C Enums
Signed-off-by: Sam Elliott <selliott@lowrisc.org>
diff --git a/util/topgen/c.py b/util/topgen/c.py
index 17ce546..6edb247 100644
--- a/util/topgen/c.py
+++ b/util/topgen/c.py
@@ -137,6 +137,7 @@
self._init_plic_targets()
self._init_plic_mapping()
self._init_alert_mapping()
+ self._init_pinmux_mapping()
def modules(self):
return [(m["name"],
@@ -276,3 +277,82 @@
self.alert_sources = sources
self.alert_alerts = alerts
self.alert_mapping = alert_mapping
+
+ def _init_pinmux_mapping(self):
+ """Generate C enums for addressing pinmux registers and in/out selects.
+
+ Inputs are connected in order: inouts, then inputs
+ Outputs are connected in order: inouts, then outputs
+
+ Inputs:
+ - Peripheral chooses register field (pinmux_peripheral_in)
+ - Insel chooses MIO input (pinmux_insel)
+
+ Outputs:
+ - MIO chooses register field (pinmux_mio_out)
+ - Outsel chooses peripheral output (pinmux_outsel)
+
+ Insel and outsel have some special values which are captured here too.
+ """
+ pinmux_info = self.top["pinmux"]
+
+ # Peripheral Inputs
+ peripheral_in = CEnum(self._top_name +
+ Name(["pinmux", "peripheral", "in"]))
+ for signal in pinmux_info["inouts"] + pinmux_info["inputs"]:
+ if "width" in signal and int(signal["width"]) != 1:
+ for i in range(int(signal["width"])):
+ name = Name.from_snake_case(
+ signal["name"]) + Name([str(i)])
+ peripheral_in.add_constant(name,
+ docstring="{} {}".format(
+ signal["name"], i))
+ else:
+ peripheral_in.add_constant(Name.from_snake_case(
+ signal["name"]),
+ docstring=signal["name"])
+ peripheral_in.add_last_constant("Last valid peripheral input")
+
+ # Pinmux Input Selects
+ insel = CEnum(self._top_name + Name(["pinmux", "insel"]))
+ insel.add_constant(Name(["constant", "zero"]),
+ docstring="Tie constantly to zero")
+ insel.add_constant(Name(["constant", "one"]),
+ docstring="Tie constantly to one")
+ for i in range(int(pinmux_info["num_mio"])):
+ insel.add_constant(Name(["mio", str(i)]),
+ docstring="MIO Pad {}".format(i))
+ insel.add_last_constant("Last valid insel value")
+
+ # MIO Outputs
+ mio_out = CEnum(self._top_name + Name(["pinmux", "mio", "out"]))
+ for i in range(int(pinmux_info["num_mio"])):
+ mio_out.add_constant(Name([str(i)]),
+ docstring="MIO Pad {}".format(i))
+ mio_out.add_last_constant("Last valid mio output")
+
+ # Pinmux Output Selects
+ outsel = CEnum(self._top_name + Name(["pinmux", "outsel"]))
+ outsel.add_constant(Name(["constant", "zero"]),
+ docstring="Tie constantly to zero")
+ outsel.add_constant(Name(["constant", "one"]),
+ docstring="Tie constantly to one")
+ outsel.add_constant(Name(["constant", "high", "z"]),
+ docstring="Tie constantly to high-Z")
+ for signal in pinmux_info["inouts"] + pinmux_info["outputs"]:
+ if "width" in signal and int(signal["width"]) != 1:
+ for i in range(int(signal["width"])):
+ name = Name.from_snake_case(
+ signal["name"]) + Name([str(i)])
+ outsel.add_constant(name,
+ docstring="{} {}".format(
+ signal["name"], i))
+ else:
+ outsel.add_constant(Name.from_snake_case(signal["name"]),
+ docstring=signal["name"])
+ outsel.add_last_constant("Last valid outsel value")
+
+ self.pinmux_peripheral_in = peripheral_in
+ self.pinmux_insel = insel
+ self.pinmux_mio_out = mio_out
+ self.pinmux_outsel = outsel
