litex/migen/fhdl/structure.py

389 lines
8.6 KiB
Python

import math
import inspect
import re
from collections import defaultdict
from migen.fhdl import tracer
def log2_int(n):
l = 1
r = 0
while l < n:
l *= 2
r += 1
if l == n:
return r
else:
raise ValueError("Not a power of 2")
def bits_for(n):
if isinstance(n, Constant):
return len(n)
else:
if n < 0:
return bits_for(-n) + 1
elif n == 0:
return 1
else:
return int(math.ceil(math.log(n+1, 2)))
class BV:
def __init__(self, width=1, signed=False):
self.width = width
self.signed = signed
def __repr__(self):
r = str(self.width) + "'"
if self.signed:
r += "s"
r += "d"
return r
def __eq__(self, other):
return self.width == other.width and self.signed == other.signed
class Value:
def __invert__(self):
return _Operator("~", [self])
def __add__(self, other):
return _Operator("+", [self, other])
def __radd__(self, other):
return _Operator("+", [other, self])
def __sub__(self, other):
return _Operator("-", [self, other])
def __rsub__(self, other):
return _Operator("-", [other, self])
def __mul__(self, other):
return _Operator("*", [self, other])
def __rmul__(self, other):
return _Operator("*", [other, self])
def __lshift__(self, other):
return _Operator("<<", [self, other])
def __rlshift__(self, other):
return _Operator("<<", [other, self])
def __rshift__(self, other):
return _Operator(">>", [self, other])
def __rrshift__(self, other):
return _Operator(">>", [other, self])
def __and__(self, other):
return _Operator("&", [self, other])
def __rand__(self, other):
return _Operator("&", [other, self])
def __xor__(self, other):
return _Operator("^", [self, other])
def __rxor__(self, other):
return _Operator("^", [other, self])
def __or__(self, other):
return _Operator("|", [self, other])
def __ror__(self, other):
return _Operator("|", [other, self])
def __lt__(self, other):
return _Operator("<", [self, other])
def __le__(self, other):
return _Operator("<=", [self, other])
def __eq__(self, other):
return _Operator("==", [self, other])
def __ne__(self, other):
return _Operator("!=", [self, other])
def __gt__(self, other):
return _Operator(">", [self, other])
def __ge__(self, other):
return _Operator(">=", [self, other])
def __getitem__(self, key):
if isinstance(key, int):
return _Slice(self, key, key+1)
elif isinstance(key, slice):
start = key.start or 0
stop = key.stop or len(self)
if stop > len(self):
stop = len(self)
if key.step != None:
raise KeyError
return _Slice(self, start, stop)
else:
raise KeyError
def eq(self, r):
return _Assign(self, r)
def __hash__(self):
return id(self)
class _Operator(Value):
def __init__(self, op, operands):
self.op = op
self.operands = list(map(_cst, operands))
class _Slice(Value):
def __init__(self, value, start, stop):
self.value = value
self.start = start
self.stop = stop
class Cat(Value):
def __init__(self, *args):
self.l = list(map(_cst, args))
class Replicate(Value):
def __init__(self, v, n):
self.v = _cst(v)
self.n = n
class Constant(Value):
def __init__(self, n, bv=None):
self.bv = bv or BV(bits_for(n), n < 0)
self.n = n
def __len__(self):
return self.bv.width
def __repr__(self):
return str(self.bv) + str(self.n)
def __eq__(self, other):
return self.bv == other.bv and self.n == other.n
def __hash__(self):
return id(self)
def binc(x, signed=False):
return Constant(int(x, 2), BV(len(x), signed))
def _cst(x):
if isinstance(x, int):
return Constant(x)
else:
return x
class Signal(Value):
_counter = 0
def __init__(self, bv=BV(), name=None, variable=False, reset=0, name_override=None):
assert(isinstance(bv, BV))
self.bv = bv
self.variable = variable
self.reset = Constant(reset, bv)
self.name_override = name_override
self.backtrace = tracer.trace_back(name)
self.order = Signal._counter
Signal._counter += 1
def __len__(self):
return self.bv.width
def __repr__(self):
return "<Signal " + (self.backtrace[-1][0] or "anonymous") + " at " + hex(id(self)) + ">"
# statements
class _Assign:
def __init__(self, l, r):
self.l = l
self.r = _cst(r)
class If:
def __init__(self, cond, *t):
self.cond = cond
self.t = list(t)
self.f = []
def Else(self, *f):
_insert_else(self, list(f))
return self
def Elif(self, cond, *t):
_insert_else(self, [If(cond, *t)])
return self
def _insert_else(obj, clause):
o = obj
while o.f:
assert(len(o.f) == 1)
assert(isinstance(o.f[0], If))
o = o.f[0]
o.f = clause
class Default:
pass
class Case:
def __init__(self, test, *cases):
self.test = test
self.cases = [(c[0], list(c[1:])) for c in cases if not isinstance(c[0], Default)]
self.default = None
for c in cases:
if isinstance(c[0], Default):
if self.default is not None:
raise ValueError
self.default = list(c[1:])
if self.default is None:
self.default = []
# arrays
class _ArrayProxy(Value):
def __init__(self, choices, key):
self.choices = choices
self.key = key
def __getattr__(self, attr):
return _ArrayProxy([getattr(choice, attr) for choice in self.choices],
self.key)
def __getitem__(self, key):
return _ArrayProxy([choice.__getitem__(key) for choice in self.choices],
self.key)
class Array(list):
def __getitem__(self, key):
if isinstance(key, Value):
return _ArrayProxy(self, key)
else:
return super().__getitem__(key)
# extras
class Instance:
def __init__(self, of, *items, name=""):
self.of = of
if name:
self.name_override = name
else:
self.name_override = of
self.items = items
class _IO:
def __init__(self, name, expr=BV(1)):
self.name = name
if isinstance(expr, BV):
self.expr = Signal(expr, name)
elif isinstance(expr, int):
self.expr = Constant(expr)
else:
self.expr = expr
class Input(_IO):
pass
class Output(_IO):
pass
class InOut(_IO):
pass
class Parameter:
def __init__(self, name, value):
self.name = name
self.value = value
class _CR:
def __init__(self, name_inst, domain="sys", invert=False):
self.name_inst = name_inst
self.domain = domain
self.invert = invert
class ClockPort(_CR):
pass
class ResetPort(_CR):
pass
def get_io(self, name):
for item in self.items:
if isinstance(item, Instance._IO) and item.name == name:
return item.expr
def __hash__(self):
return id(self)
(READ_FIRST, WRITE_FIRST, NO_CHANGE) = range(3)
class MemoryPort:
def __init__(self, adr, dat_r, we=None, dat_w=None,
async_read=False, re=None, we_granularity=0, mode=WRITE_FIRST,
clock_domain="sys"):
self.adr = adr
self.dat_r = dat_r
self.we = we
self.dat_w = dat_w
self.async_read = async_read
self.re = re
self.we_granularity = we_granularity
self.mode = mode
self.clock_domain = clock_domain
class Memory:
def __init__(self, width, depth, *ports, init=None):
self.width = width
self.depth = depth
self.ports = ports
self.init = init
#
class Fragment:
def __init__(self, comb=None, sync=None, instances=None, memories=None, sim=None):
if comb is None: comb = []
if sync is None: sync = dict()
if instances is None: instances = []
if memories is None: memories = []
if sim is None: sim = []
if isinstance(sync, list):
sync = {"sys": sync}
self.comb = comb
self.sync = sync
self.instances = instances
self.memories = memories
self.sim = sim
def __add__(self, other):
newsync = defaultdict(list)
for k, v in self.sync.items():
newsync[k] = v[:]
for k, v in other.sync.items():
newsync[k].extend(v)
return Fragment(self.comb + other.comb, newsync,
self.instances + other.instances,
self.memories + other.memories,
self.sim + other.sim)
def rename_clock_domain(self, old, new):
self.sync["new"] = self.sync["old"]
del self.sync["old"]
for inst in self.instances:
for cr in filter(lambda x: isinstance(x, Instance._CR), inst.items):
if cr.domain == old:
cr.domain = new
for mem in self.memories:
for port in mem.ports:
if port.clock_domain == old:
port.clock_domain = new
def get_clock_domains(self):
r = set(self.sync.keys())
r |= set(cr.domain
for inst in self.instances
for cr in filter(lambda x: isinstance(x, Instance._CR), inst.items))
r |= set(port.clock_domain
for mem in self.memories
for port in mem.ports)
return r
def call_sim(self, simulator):
for s in self.sim:
if simulator.cycle_counter >= 0 or (hasattr(s, "initialize") and s.initialize):
s(simulator)
class ClockDomain:
def __init__(self, n1, n2=None):
if n2 is None:
n_clk = n1 + "_clk"
n_rst = n1 + "_rst"
else:
n_clk = n1
n_rst = n2
self.clk = Signal(name_override=n_clk)
self.rst = Signal(name_override=n_rst)