230 lines
9.4 KiB
Python
230 lines
9.4 KiB
Python
from typing import TYPE_CHECKING
|
|
|
|
from systemrdl.rdltypes import PropertyReference, PrecedenceType
|
|
|
|
from .bases import AssignmentPrecedence, NextStateConditional
|
|
from . import sw_onread
|
|
from . import sw_onwrite
|
|
from . import hw_write
|
|
from . import hw_set_clr
|
|
|
|
from ..utils import get_indexed_path
|
|
|
|
from .generators import CombinationalStructGenerator, FieldStorageStructGenerator, FieldLogicGenerator
|
|
|
|
if TYPE_CHECKING:
|
|
from typing import Dict, List
|
|
from systemrdl.node import AddrmapNode, FieldNode
|
|
from ..exporter import RegblockExporter
|
|
|
|
class FieldLogic:
|
|
def __init__(self, exp:'RegblockExporter'):
|
|
self.exp = exp
|
|
|
|
self._hw_conditionals = {} # type: Dict[int, List[NextStateConditional]]
|
|
self._sw_conditionals = {} # type: Dict[int, List[NextStateConditional]]
|
|
|
|
self.init_conditionals()
|
|
|
|
@property
|
|
def top_node(self) -> 'AddrmapNode':
|
|
return self.exp.top_node
|
|
|
|
def get_storage_struct(self) -> str:
|
|
struct_gen = FieldStorageStructGenerator()
|
|
s = struct_gen.get_struct(self.top_node, "field_storage_t")
|
|
|
|
# Only declare the storage struct if it exists
|
|
if s is None:
|
|
return ""
|
|
|
|
return s + "\nfield_storage_t field_storage;"
|
|
|
|
def get_combo_struct(self) -> str:
|
|
struct_gen = CombinationalStructGenerator(self)
|
|
s = struct_gen.get_struct(self.top_node, "field_combo_t")
|
|
|
|
# Only declare the storage struct if it exists
|
|
if s is None:
|
|
return ""
|
|
|
|
return s + "\nfield_combo_t field_combo;"
|
|
|
|
def get_implementation(self) -> str:
|
|
gen = FieldLogicGenerator(self)
|
|
s = gen.get_content(self.top_node)
|
|
if s is None:
|
|
return ""
|
|
return s
|
|
|
|
#---------------------------------------------------------------------------
|
|
# Field utility functions
|
|
#---------------------------------------------------------------------------
|
|
def get_storage_identifier(self, node: 'FieldNode') -> str:
|
|
"""
|
|
Returns the Verilog string that represents the storage register element
|
|
for the referenced field
|
|
"""
|
|
assert node.implements_storage
|
|
path = get_indexed_path(self.top_node, node)
|
|
return f"field_storage.{path}"
|
|
|
|
def get_field_next_identifier(self, node: 'FieldNode') -> str:
|
|
"""
|
|
Returns a Verilog string that represents the field's next-state.
|
|
This is specifically for use in Field->next property references.
|
|
"""
|
|
assert node.implements_storage
|
|
path = get_indexed_path(self.top_node, node)
|
|
return f"field_combo.{path}.next"
|
|
|
|
def get_counter_incr_identifier(self, field: 'FieldNode') -> str:
|
|
"""
|
|
Return the Veriog string that represents the field's inferred incr/decr strobe signal.
|
|
prop_ref will be either an incr or decr property reference, and it is already known that
|
|
the incr/decr properties are not explicitly set by the user and are therefore inferred.
|
|
"""
|
|
# TODO: Implement this
|
|
raise NotImplementedError
|
|
|
|
def get_counter_decr_identifier(self, field: 'FieldNode') -> str:
|
|
"""
|
|
Return the Veriog string that represents the field's inferred incr/decr strobe signal.
|
|
prop_ref will be either an incr or decr property reference, and it is already known that
|
|
the incr/decr properties are not explicitly set by the user and are therefore inferred.
|
|
"""
|
|
# TODO: Implement this
|
|
raise NotImplementedError
|
|
|
|
def get_swacc_identifier(self, field: 'FieldNode') -> str:
|
|
"""
|
|
Asserted when field is software accessed (read)
|
|
"""
|
|
strb = self.exp.dereferencer.get_access_strobe(field)
|
|
return f"{strb} && !decoded_req_is_wr"
|
|
|
|
def get_swmod_identifier(self, field: 'FieldNode') -> str:
|
|
"""
|
|
Asserted when field is modified by software (written or read with a
|
|
set or clear side effect).
|
|
"""
|
|
w_modifiable = field.is_sw_writable
|
|
r_modifiable = (field.get_property("onread") is not None)
|
|
strb = self.exp.dereferencer.get_access_strobe(field)
|
|
|
|
if w_modifiable and not r_modifiable:
|
|
# assert swmod only on sw write
|
|
return f"{strb} && decoded_req_is_wr"
|
|
|
|
if w_modifiable and r_modifiable:
|
|
# assert swmod on all sw actions
|
|
return strb
|
|
|
|
if not w_modifiable and r_modifiable:
|
|
# assert swmod only on sw read
|
|
return f"{strb} && !decoded_req_is_wr"
|
|
|
|
# Not sw modifiable
|
|
return "1'b0"
|
|
|
|
|
|
#---------------------------------------------------------------------------
|
|
# Field Logic Conditionals
|
|
#---------------------------------------------------------------------------
|
|
def add_hw_conditional(self, conditional: NextStateConditional, precedence: AssignmentPrecedence) -> None:
|
|
"""
|
|
Register a NextStateConditional action for hardware-triggered field updates.
|
|
Categorizing conditionals correctly by hw/sw ensures that the RDL precedence
|
|
property can be reliably honored.
|
|
|
|
The ``precedence`` argument determines the conditional assignment's priority over
|
|
other assignments of differing precedence.
|
|
|
|
If multiple conditionals of the same precedence are registered, they are
|
|
searched sequentially and only the first to match the given field is used.
|
|
Conditionals are searched in reverse order that they were registered.
|
|
"""
|
|
if precedence not in self._hw_conditionals:
|
|
self._hw_conditionals[precedence] = []
|
|
self._hw_conditionals[precedence].append(conditional)
|
|
|
|
|
|
def add_sw_conditional(self, conditional: NextStateConditional, precedence: AssignmentPrecedence) -> None:
|
|
"""
|
|
Register a NextStateConditional action for software-triggered field updates.
|
|
Categorizing conditionals correctly by hw/sw ensures that the RDL precedence
|
|
property can be reliably honored.
|
|
|
|
The ``precedence`` argument determines the conditional assignment's priority over
|
|
other assignments of differing precedence.
|
|
|
|
If multiple conditionals of the same precedence are registered, they are
|
|
searched sequentially and only the first to match the given field is used.
|
|
Conditionals are searched in reverse order that they were registered.
|
|
"""
|
|
if precedence not in self._sw_conditionals:
|
|
self._sw_conditionals[precedence] = []
|
|
self._sw_conditionals[precedence].append(conditional)
|
|
|
|
|
|
def init_conditionals(self) -> None:
|
|
"""
|
|
Initialize all possible conditionals here.
|
|
|
|
Remember: The order in which conditionals are added matters within the
|
|
same assignment precedence.
|
|
"""
|
|
|
|
# TODO: Add all the other things
|
|
self.add_sw_conditional(sw_onread.ClearOnRead(self.exp), AssignmentPrecedence.SW_ONREAD)
|
|
self.add_sw_conditional(sw_onread.SetOnRead(self.exp), AssignmentPrecedence.SW_ONREAD)
|
|
|
|
self.add_sw_conditional(sw_onwrite.WriteOneSet(self.exp), AssignmentPrecedence.SW_ONWRITE)
|
|
self.add_sw_conditional(sw_onwrite.WriteOneClear(self.exp), AssignmentPrecedence.SW_ONWRITE)
|
|
self.add_sw_conditional(sw_onwrite.WriteOneToggle(self.exp), AssignmentPrecedence.SW_ONWRITE)
|
|
self.add_sw_conditional(sw_onwrite.WriteZeroSet(self.exp), AssignmentPrecedence.SW_ONWRITE)
|
|
self.add_sw_conditional(sw_onwrite.WriteZeroClear(self.exp), AssignmentPrecedence.SW_ONWRITE)
|
|
self.add_sw_conditional(sw_onwrite.WriteZeroToggle(self.exp), AssignmentPrecedence.SW_ONWRITE)
|
|
self.add_sw_conditional(sw_onwrite.WriteClear(self.exp), AssignmentPrecedence.SW_ONWRITE)
|
|
self.add_sw_conditional(sw_onwrite.WriteSet(self.exp), AssignmentPrecedence.SW_ONWRITE)
|
|
self.add_sw_conditional(sw_onwrite.Write(self.exp), AssignmentPrecedence.SW_ONWRITE)
|
|
|
|
self.add_hw_conditional(hw_write.AlwaysWrite(self.exp), AssignmentPrecedence.HW_WRITE)
|
|
self.add_hw_conditional(hw_write.WELWrite(self.exp), AssignmentPrecedence.HW_WRITE)
|
|
self.add_hw_conditional(hw_write.WEWrite(self.exp), AssignmentPrecedence.HW_WRITE)
|
|
|
|
self.add_hw_conditional(hw_set_clr.HWClear(self.exp), AssignmentPrecedence.HWCLR)
|
|
|
|
self.add_hw_conditional(hw_set_clr.HWSet(self.exp), AssignmentPrecedence.HWSET)
|
|
|
|
|
|
def _get_X_conditionals(self, conditionals: 'Dict[int, List[NextStateConditional]]', field: 'FieldNode') -> 'List[NextStateConditional]':
|
|
result = []
|
|
precedences = sorted(conditionals.keys(), reverse=True)
|
|
for precedence in precedences:
|
|
for conditional in conditionals[precedence]:
|
|
if conditional.is_match(field):
|
|
result.append(conditional)
|
|
return result
|
|
|
|
|
|
def get_conditionals(self, field: 'FieldNode') -> 'List[NextStateConditional]':
|
|
"""
|
|
Get a list of NextStateConditional objects that apply to the given field.
|
|
|
|
The returned list is sorted in priority order - the conditional with highest
|
|
precedence is first in the list.
|
|
"""
|
|
sw_precedence = (field.get_property('precedence') == PrecedenceType.sw)
|
|
result = []
|
|
|
|
if sw_precedence:
|
|
result.extend(self._get_X_conditionals(self._sw_conditionals, field))
|
|
|
|
result.extend(self._get_X_conditionals(self._hw_conditionals, field))
|
|
|
|
if not sw_precedence:
|
|
result.extend(self._get_X_conditionals(self._sw_conditionals, field))
|
|
|
|
return result
|