202 lines
6.4 KiB
Python
202 lines
6.4 KiB
Python
import ast
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from itertools import zip_longest
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from migen.fhdl.std import *
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from migen.flow.actor import Source, Sink
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from migen.flow.transactions import *
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from migen.bus import wishbone
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from migen.bus.transactions import *
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from migen.pytholite.util import *
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from migen.pytholite.expr import ExprCompiler
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class _TokenPullExprCompiler(ExprCompiler):
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def __init__(self, symdict, modelname, ep):
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ExprCompiler.__init__(self, symdict)
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self.modelname = modelname
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self.ep = ep
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def visit_expr_subscript(self, node):
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# check that we are subscripting <modelname>.value
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if not isinstance(node.value, ast.Attribute) \
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or node.value.attr != "value" \
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or not isinstance(node.value.value, ast.Name) \
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or node.value.value.id != self.modelname:
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raise NotImplementedError
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if not isinstance(node.slice, ast.Index):
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raise NotImplementedError
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field = eval_ast(node.slice.value, self.symdict)
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signal = getattr(self.ep.payload, field)
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return signal
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def _gen_df_io(compiler, modelname, to_model, from_model):
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epname = eval_ast(to_model["endpoint"], compiler.symdict)
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values = to_model["value"]
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idle_wait = eval_ast(to_model["idle_wait"], compiler.symdict)
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ep = getattr(compiler.ioo, epname)
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if idle_wait:
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state = [compiler.ioo.busy.eq(0)]
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else:
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state = []
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if isinstance(values, ast.Name) and values.id == "None":
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# token pull from sink
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if not isinstance(ep, Sink):
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raise TypeError("Attempted to pull from source")
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ec = _TokenPullExprCompiler(compiler.symdict, modelname, ep)
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for target_regs, expr in from_model:
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cexpr = ec.visit_expr(expr)
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state += [reg.load(cexpr) for reg in target_regs]
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state += [
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ep.ack.eq(1),
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If(~ep.stb, id_next_state(state))
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]
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return [state], [state]
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else:
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# token push to source
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if not isinstance(ep, Source):
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raise TypeError("Attempted to push to sink")
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if from_model:
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raise TypeError("Attempted to read from pushed token")
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if not isinstance(values, ast.Dict):
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raise NotImplementedError
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for akey, value in zip(values.keys, values.values):
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key = eval_ast(akey, compiler.symdict)
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signal = getattr(ep.payload, key)
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state.append(signal.eq(compiler.ec.visit_expr(value)))
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state += [
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ep.stb.eq(1),
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If(~ep.ack, id_next_state(state))
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]
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return [state], [state]
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class _BusReadExprCompiler(ExprCompiler):
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def __init__(self, symdict, modelname, data_signal):
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ExprCompiler.__init__(self, symdict)
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self.modelname = modelname
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self.data_signal = data_signal
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def visit_expr_attribute(self, node):
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# recognize <modelname>.data as the bus read signal, raise exception otherwise
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if not isinstance(node.value, ast.Name) \
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or node.value.id != self.modelname \
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or node.attr != "data":
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raise NotImplementedError
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return self.data_signal
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def _gen_wishbone_io(compiler, modelname, model, to_model, from_model, bus):
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state = [
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bus.cyc.eq(1),
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bus.stb.eq(1),
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bus.adr.eq(compiler.ec.visit_expr(to_model["address"])),
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]
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if model == TWrite:
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if from_model:
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raise TypeError("Attempted to read from write transaction")
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state += [
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bus.we.eq(1),
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bus.dat_w.eq(compiler.ec.visit_expr(to_model["data"]))
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]
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sel = to_model["sel"]
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if isinstance(sel, ast.Name) and sel.id == "None":
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nbytes = (flen(bus.dat_w) + 7)//8
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state.append(bus.sel.eq(2**nbytes-1))
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else:
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state.append(bus.sel.eq(compiler.ec.visit_expr(sel)))
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else:
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ec = _BusReadExprCompiler(compiler.symdict, modelname, bus.dat_r)
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for target_regs, expr in from_model:
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cexpr = ec.visit_expr(expr)
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state += [reg.load(cexpr) for reg in target_regs]
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state.append(If(~bus.ack, id_next_state(state)))
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return [state], [state]
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def _gen_memory_io(compiler, modelname, model, to_model, from_model, port):
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s1 = [port.adr.eq(compiler.ec.visit_expr(to_model["address"]))]
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if model == TWrite:
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if from_model:
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raise TypeError("Attempted to read from write transaction")
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s1.append(port.dat_w.eq(compiler.ec.visit_expr(to_model["data"])))
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sel = to_model["sel"]
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if isinstance(sel, ast.Name) and sel.id == "None":
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nbytes = (flen(port.dat_w) + 7)//8
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s1.append(port.we.eq(2**nbytes-1))
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else:
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s1.append(port.we.eq(compiler.ec.visit_expr(sel)))
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return [s1], [s1]
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else:
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s2 = []
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s1.append(id_next_state(s2))
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ec = _BusReadExprCompiler(compiler.symdict, modelname, port.dat_r)
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for target_regs, expr in from_model:
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cexpr = ec.visit_expr(expr)
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s2 += [reg.load(cexpr) for reg in target_regs]
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return [s1, s2], [s2]
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def _gen_bus_io(compiler, modelname, model, to_model, from_model):
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busname = eval_ast(to_model["busname"], compiler.symdict)
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if busname is None:
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buses = compiler.ioo.get_buses()
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if len(buses) != 1:
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raise TypeError("Bus name not specified")
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bus = list(buses.values())[0]
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else:
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bus = getattr(compiler.ioo, busname)
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if isinstance(bus, wishbone.Interface):
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return _gen_wishbone_io(compiler, modelname, model, to_model, from_model, bus)
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elif isinstance(bus, Memory):
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port = compiler.ioo.memory_ports[bus]
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return _gen_memory_io(compiler, modelname, model, to_model, from_model, port)
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else:
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raise NotImplementedError("Unsupported bus")
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def _decode_args(desc, args, args_kw):
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d = {}
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argnames = set()
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for param, value in zip_longest(desc, args):
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if param is None:
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raise TypeError("Too many arguments")
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if isinstance(param, tuple):
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name, default = param
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else:
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name, default = param, None
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# build the set of argument names at the same time
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argnames.add(name)
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if value is None:
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if default is None:
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raise TypeError("No default value for parameter " + name)
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else:
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d[name] = default
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else:
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d[name] = value
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for akw in args_kw:
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if akw.arg not in argnames:
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raise TypeError("Parameter " + akw.arg + " does not exist")
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d[akw.arg] = akw.value
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return d
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def gen_io(compiler, modelname, model, to_model, to_model_kw, from_model):
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if model == Token:
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desc = [
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"endpoint",
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("value", ast.Name("None", ast.Load(), lineno=0, col_offset=0)),
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("idle_wait", ast.Name("False", ast.Load(), lineno=0, col_offset=0))
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]
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args = _decode_args(desc, to_model, to_model_kw)
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return _gen_df_io(compiler, modelname, args, from_model)
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elif model == TRead or model == TWrite:
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desc = [
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"address",
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("data", ast.Num(0)),
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("sel", ast.Name("None", ast.Load(), lineno=0, col_offset=0)),
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("busname", ast.Name("None", ast.Load(), lineno=0, col_offset=0))
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]
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args = _decode_args(desc, to_model, to_model_kw)
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return _gen_bus_io(compiler, modelname, model, args, from_model)
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else:
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raise NotImplementedError
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