more field logic

peakrdl/regblock/field_logic/hw_set_clr.py

@@ -0,0 +1,76 @@
+from typing import TYPE_CHECKING, List
+
+from .bases import NextStateConditional
+
+if TYPE_CHECKING:
+    from systemrdl.node import FieldNode
+
+
+class HWSet(NextStateConditional):
+    comment = "HW Set"
+    def is_match(self, field: 'FieldNode') -> bool:
+        return bool(field.get_property('hwset'))
+
+    def get_predicate(self, field: 'FieldNode') -> str:
+        prop = field.get_property('hwset')
+        if isinstance(prop, bool):
+            identifier = self.exp.hwif.get_implied_prop_input_identifier(field, "hwset")
+        else:
+            # signal or field
+            identifier = self.exp.dereferencer.get_value(prop)
+        return identifier
+
+    def get_assignments(self, field: 'FieldNode') -> List[str]:
+        field_path = self.get_field_path(field)
+
+        hwmask = field.get_property('hwmask')
+        hwenable = field.get_property('hwenable')
+        R = f"field_storage.{field_path}"
+        if hwmask is not None:
+            M = self.exp.dereferencer.get_value(hwmask)
+            next_val = f"{R} | ~{M}"
+        elif hwenable is not None:
+            E = self.exp.dereferencer.get_value(hwenable)
+            next_val = f"{R} | {E}"
+        else:
+            next_val = "'1"
+
+        return [
+            f"field_combo.{field_path}.next = {next_val};",
+            f"field_combo.{field_path}.load_next = '1;",
+        ]
+
+
+class HWClear(NextStateConditional):
+    comment = "HW Clear"
+    def is_match(self, field: 'FieldNode') -> bool:
+        return bool(field.get_property('hwclr'))
+
+    def get_predicate(self, field: 'FieldNode') -> str:
+        prop = field.get_property('hwclr')
+        if isinstance(prop, bool):
+            identifier = self.exp.hwif.get_implied_prop_input_identifier(field, "hwclr")
+        else:
+            # signal or field
+            identifier = self.exp.dereferencer.get_value(prop)
+        return identifier
+
+    def get_assignments(self, field: 'FieldNode') -> List[str]:
+        field_path = self.get_field_path(field)
+
+        hwmask = field.get_property('hwmask')
+        hwenable = field.get_property('hwenable')
+        R = f"field_storage.{field_path}"
+        if hwmask is not None:
+            M = self.exp.dereferencer.get_value(hwmask)
+            next_val = f"{R} & {M}"
+        elif hwenable is not None:
+            E = self.exp.dereferencer.get_value(hwenable)
+            next_val = f"{R} & ~{E}"
+        else:
+            next_val = "'0"
+
+        return [
+            f"field_combo.{field_path}.next = {next_val};",
+            f"field_combo.{field_path}.load_next = '1;",
+        ]