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csr/fields: add access parameter

This commit is contained in:
Florent Kermarrec 2019-09-14 21:57:23 +02:00
parent 23b01f8f02
commit 4e84729cf9
1 changed files with 12 additions and 4 deletions
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16
litex/soc/interconnect/csr.py
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@ -123,24 +123,32 @@ class _CompoundCSR(_CSRBase, Module):
class CSRField(Signal): class CSRField(Signal):
def __init__(self, name, size=1, offset=None, reset=0, description=None, pulse=False, values=None): def __init__(self, name, size=1, offset=None, reset=0, description=None, pulse=False, access=None, values=None):
assert name == name.lower() assert name == name.lower()
assert access in [None, "write-only", "read-only", "read-write"]
self.name = name self.name = name
self.size = size self.size = size
self.offset = offset self.offset = offset
self.reset_value = reset self.reset_value = reset
self.description = description self.description = description
self.access = access
self.pulse = pulse self.pulse = pulse
self.values = values self.values = values
Signal.__init__(self, size, name=name, reset=reset) Signal.__init__(self, size, name=name, reset=reset)
class CSRFieldCompound: class CSRFieldCompound:
def __init__(self, fields): def __init__(self, fields, access):
self.check_names(fields) self.check_names(fields)
self.check_ordering_overlap(fields) self.check_ordering_overlap(fields)
self.fields = fields self.fields = fields
for field in fields: for field in fields:
if field.access is None:
field.access = access
elif access == "read-only":
assert field.access == "read-only"
elif access == "read-write":
assert field.access in ["read-write", "write-only"]
setattr(self, field.name, field) setattr(self, field.name, field)
@staticmethod @staticmethod
@ -210,7 +218,7 @@ class CSRStatus(_CompoundCSR):
def __init__(self, size=1, reset=0, fields=[], name=None, description=None): def __init__(self, size=1, reset=0, fields=[], name=None, description=None):
if fields != []: if fields != []:
self.fields = CSRFieldCompound(fields) self.fields = CSRFieldCompound(fields, "read-only")
size = self.fields.get_size() size = self.fields.get_size()
reset = self.fields.get_reset() reset = self.fields.get_reset()
_CompoundCSR.__init__(self, size, name) _CompoundCSR.__init__(self, size, name)
@ -287,7 +295,7 @@ class CSRStorage(_CompoundCSR):
def __init__(self, size=1, reset=0, fields=[], atomic_write=False, write_from_dev=False, alignment_bits=0, name=None, description=None): def __init__(self, size=1, reset=0, fields=[], atomic_write=False, write_from_dev=False, alignment_bits=0, name=None, description=None):
if fields != []: if fields != []:
self.fields = CSRFieldCompound(fields) self.fields = CSRFieldCompound(fields, "read-write")
size = self.fields.get_size() size = self.fields.get_size()
reset = self.fields.get_reset() reset = self.fields.get_reset()
_CompoundCSR.__init__(self, size, name) _CompoundCSR.__init__(self, size, name)