litex/migen/fhdl/decorators.py

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from migen.fhdl.structure import *
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from migen.fhdl.tools import insert_reset, rename_clock_domain
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class ModuleDecorator:
def __init__(self, decorated):
object.__setattr__(self, "_md_decorated", decorated)
def __getattr__(self, name):
return getattr(self._md_decorated, name)
def __setattr__(self, name, value):
return setattr(self._md_decorated, name, value)
# overload this in derived classes
def transform_fragment(self, f):
pass
def get_fragment(self):
f = self._md_decorated.get_fragment()
self.transform_fragment(f)
return f
def __dir__(self):
return dir(self._md_decorated)
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class DecorateModule:
def __init__(self, decorator, *dec_args, **dec_kwargs):
self.decorator = decorator
self.dec_args = dec_args
self.dec_kwargs = dec_kwargs
def __call__(self, decorated):
def dfinit(dfself, *args, **kwargs):
self.decorator.__init__(dfself, decorated(*args, **kwargs),
*self.dec_args, **self.dec_kwargs)
typename = self.decorator.__name__ + "(" + decorated.__name__ + ")"
return type(typename, (self.decorator,), dict(__init__=dfinit))
class InsertControl(ModuleDecorator):
def __init__(self, control_name, decorated, clock_domains=None):
ModuleDecorator.__init__(self, decorated)
object.__setattr__(self, "_ic_control_name", control_name)
object.__setattr__(self, "_ic_clock_domains", clock_domains)
if clock_domains is None:
ctl = Signal(name=control_name)
assert(not hasattr(decorated, control_name))
object.__setattr__(self, control_name, ctl)
else:
for cd in clock_domains:
name = control_name + "_" + cd
ctl = Signal(name=name)
assert(not hasattr(decorated, name))
object.__setattr__(self, name, ctl)
def transform_fragment(self, f):
control_name = self._ic_control_name
clock_domains = self._ic_clock_domains
if clock_domains is None:
if len(f.sync) != 1:
raise ValueError("Control signal clock domains must be specified when module has more than one domain")
cdn = list(f.sync.keys())[0]
to_insert = [(getattr(self, control_name), cdn)]
else:
to_insert = [(getattr(self, control_name+"_"+cdn), cdn) for cdn in clock_domains]
self.transform_fragment_insert(f, to_insert)
class InsertCE(InsertControl):
def __init__(self, *args, **kwargs):
InsertControl.__init__(self, "ce", *args, **kwargs)
def transform_fragment_insert(self, f, to_insert):
for ce, cdn in to_insert:
f.sync[cdn] = [If(ce, *f.sync[cdn])]
class InsertReset(InsertControl):
def __init__(self, *args, **kwargs):
InsertControl.__init__(self, "reset", *args, **kwargs)
def transform_fragment_insert(self, f, to_insert):
for reset, cdn in to_insert:
f.sync[cdn] = insert_reset(reset, f.sync[cdn])
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class RenameClockDomains(ModuleDecorator):
def __init__(self, decorated, cd_remapping):
ModuleDecorator.__init__(self, decorated)
if isinstance(cd_remapping, str):
cd_remapping = {"sys": cd_remapping}
object.__setattr__(self, "_rc_cd_remapping", cd_remapping)
def transform_fragment(self, f):
for old, new in self._rc_cd_remapping.items():
rename_clock_domain(f, old, new)