131 lines
3.9 KiB
Python
131 lines
3.9 KiB
Python
from typing import TYPE_CHECKING, List
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from systemrdl.rdltypes import OnWriteType
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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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# TODO: implement sw=w1 "write once" fields
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class _OnWrite(NextStateConditional):
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onwritetype = None
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def is_match(self, field: 'FieldNode') -> bool:
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return field.is_sw_writable and field.get_property('onwrite') == self.onwritetype
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def get_predicate(self, field: 'FieldNode') -> str:
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strb = self.exp.dereferencer.get_access_strobe(field)
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if field.get_property('swwe') or field.get_property('swwel'):
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# dereferencer will wrap swwel complement if necessary
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qualifier = self.exp.dereferencer.get_field_propref_value(field, 'swwe')
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return f"{strb} && decoded_req_is_wr && {qualifier}"
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return f"{strb} && decoded_req_is_wr"
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def _wr_data(self, field: 'FieldNode') -> str:
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if field.msb < field.lsb:
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# Field gets bitswapped since it is in [low:high] orientation
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value = f"{{<<{{decoded_wr_data[{field.high}:{field.low}]}}}}"
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else:
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value = f"decoded_wr_data[{field.high}:{field.low}]"
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return value
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class WriteOneSet(_OnWrite):
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comment = "SW write 1 set"
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onwritetype = OnWriteType.woset
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def get_assignments(self, field: 'FieldNode') -> List[str]:
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R = self.exp.field_logic.get_storage_identifier(field)
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return [
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f"next_c = {R} | {self._wr_data(field)};",
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"load_next_c = '1;",
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]
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class WriteOneClear(_OnWrite):
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comment = "SW write 1 clear"
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onwritetype = OnWriteType.woclr
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def get_assignments(self, field: 'FieldNode') -> List[str]:
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R = self.exp.field_logic.get_storage_identifier(field)
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return [
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f"next_c = {R} & ~{self._wr_data(field)};",
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"load_next_c = '1;",
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]
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class WriteOneToggle(_OnWrite):
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comment = "SW write 1 toggle"
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onwritetype = OnWriteType.wot
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def get_assignments(self, field: 'FieldNode') -> List[str]:
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R = self.exp.field_logic.get_storage_identifier(field)
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return [
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f"next_c = {R} ^ {self._wr_data(field)};",
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"load_next_c = '1;",
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]
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class WriteZeroSet(_OnWrite):
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comment = "SW write 0 set"
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onwritetype = OnWriteType.wzs
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def get_assignments(self, field: 'FieldNode') -> List[str]:
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R = self.exp.field_logic.get_storage_identifier(field)
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return [
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f"next_c = {R} | ~{self._wr_data(field)};",
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"load_next_c = '1;",
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]
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class WriteZeroClear(_OnWrite):
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comment = "SW write 0 clear"
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onwritetype = OnWriteType.wzc
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def get_assignments(self, field: 'FieldNode') -> List[str]:
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R = self.exp.field_logic.get_storage_identifier(field)
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return [
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f"next_c = {R} & {self._wr_data(field)};",
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"load_next_c = '1;",
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]
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class WriteZeroToggle(_OnWrite):
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comment = "SW write 0 toggle"
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onwritetype = OnWriteType.wzt
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def get_assignments(self, field: 'FieldNode') -> List[str]:
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R = self.exp.field_logic.get_storage_identifier(field)
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return [
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f"next_c = {R} ^ ~{self._wr_data(field)};",
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"load_next_c = '1;",
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]
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class WriteClear(_OnWrite):
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comment = "SW write clear"
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onwritetype = OnWriteType.wclr
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def get_assignments(self, field: 'FieldNode') -> List[str]:
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return [
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"next_c = '0;",
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"load_next_c = '1;",
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]
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class WriteSet(_OnWrite):
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comment = "SW write set"
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onwritetype = OnWriteType.wset
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def get_assignments(self, field: 'FieldNode') -> List[str]:
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return [
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"next_c = '1;",
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"load_next_c = '1;",
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]
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class Write(_OnWrite):
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comment = "SW write"
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onwritetype = None
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def get_assignments(self, field: 'FieldNode') -> List[str]:
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return [
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f"next_c = {self._wr_data(field)};",
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"load_next_c = '1;",
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]
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