78 lines
2.4 KiB
Python
78 lines
2.4 KiB
Python
from typing import TYPE_CHECKING, List
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from .bases import NextStateConditional
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if TYPE_CHECKING:
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from systemrdl.node import FieldNode
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class AlwaysWrite(NextStateConditional):
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"""
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hw writable, without any qualifying we/wel
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"""
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is_unconditional = True
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comment = "HW Write"
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def is_match(self, field: 'FieldNode') -> bool:
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return (
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field.is_hw_writable
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and not field.get_property('we')
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and not field.get_property('wel')
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)
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def get_assignments(self, field: 'FieldNode') -> List[str]:
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hwmask = field.get_property('hwmask')
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hwenable = field.get_property('hwenable')
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I = str(self.exp.hwif.get_input_identifier(field))
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R = self.exp.field_logic.get_storage_identifier(field)
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if hwmask is not None:
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M = self.exp.dereferencer.get_value(hwmask)
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next_val = f"{I} & ~{M} | {R} & {M}"
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elif hwenable is not None:
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E = self.exp.dereferencer.get_value(hwenable)
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next_val = f"{I} & {E} | {R} & ~{E}"
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else:
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next_val = I
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return [
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f"next_c = {next_val};",
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"load_next_c = '1;",
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]
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class WEWrite(AlwaysWrite):
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is_unconditional = False
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comment = "HW Write - we"
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def is_match(self, field: 'FieldNode') -> bool:
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return (
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field.is_hw_writable
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and bool(field.get_property('we'))
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)
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def get_predicate(self, field: 'FieldNode') -> str:
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prop = field.get_property('we')
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if isinstance(prop, bool):
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identifier = self.exp.hwif.get_implied_prop_input_identifier(field, "we")
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else:
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# signal or field
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identifier = str(self.exp.dereferencer.get_value(prop))
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return identifier
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class WELWrite(AlwaysWrite):
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is_unconditional = False
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comment = "HW Write - wel"
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def is_match(self, field: 'FieldNode') -> bool:
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return (
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field.is_hw_writable
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and bool(field.get_property('wel'))
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)
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def get_predicate(self, field: 'FieldNode') -> str:
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prop = field.get_property('wel')
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if isinstance(prop, bool):
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identifier = self.exp.hwif.get_implied_prop_input_identifier(field, "wel")
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else:
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# signal or field
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identifier = str(self.exp.dereferencer.get_value(prop))
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return f"!{identifier}"
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