for i, source in enumerate(sources):
cases[i] = Record.connect(self.sink, source)
self.comb += Case(self.sel, cases)
+
+# TODO: clean up code below
+# XXX
+
+from copy import copy
+from migen.util.misc import xdir
+
+def pack_layout(l, n):
+ return [("chunk"+str(i), l) for i in range(n)]
+
+def get_endpoints(obj, filt=_Endpoint):
+ if hasattr(obj, "get_endpoints") and callable(obj.get_endpoints):
+ return obj.get_endpoints(filt)
+ r = dict()
+ for k, v in xdir(obj, True):
+ if isinstance(v, filt):
+ r[k] = v
+ return r
+
+def get_single_ep(obj, filt):
+ eps = get_endpoints(obj, filt)
+ if len(eps) != 1:
+ raise ValueError("More than one endpoint")
+ return list(eps.items())[0]
+
+
+class BinaryActor(Module):
+ def __init__(self, *args, **kwargs):
+ self.busy = Signal()
+ sink = get_single_ep(self, Sink)[1]
+ source = get_single_ep(self, Source)[1]
+ self.build_binary_control(sink, source, *args, **kwargs)
+
+ def build_binary_control(self, sink, source):
+ raise NotImplementedError("Binary actor classes must overload build_binary_control_fragment")
+
+
+class CombinatorialActor(BinaryActor):
+ def build_binary_control(self, sink, source):
+ self.comb += [
+ source.stb.eq(sink.stb),
+ sink.ack.eq(source.ack),
+ self.busy.eq(0)
+ ]
+ if sink.description.packetized:
+ self.comb += [
+ source.sop.eq(sink.sop),
+ source.eop.eq(sink.eop)
+ ]
+
+
+class Unpack(Module):
+ def __init__(self, n, layout_to, reverse=False):
+ self.source = source = Source(layout_to)
+ description_from = copy(source.description)
+ description_from.payload_layout = pack_layout(description_from.payload_layout, n)
+ self.sink = sink = Sink(description_from)
+
+ self.busy = Signal()
+
+ ###
+
+ mux = Signal(max=n)
+ first = Signal()
+ last = Signal()
+ self.comb += [
+ first.eq(mux == 0),
+ last.eq(mux == (n-1)),
+ source.stb.eq(sink.stb),
+ sink.ack.eq(last & source.ack)
+ ]
+ self.sync += [
+ If(source.stb & source.ack,
+ If(last,
+ mux.eq(0)
+ ).Else(
+ mux.eq(mux + 1)
+ )
+ )
+ ]
+ cases = {}
+ for i in range(n):
+ chunk = n-i-1 if reverse else i
+ cases[i] = [source.payload.raw_bits().eq(getattr(sink.payload, "chunk"+str(chunk)).raw_bits())]
+ self.comb += Case(mux, cases).makedefault()
+
+ if description_from.packetized:
+ self.comb += [
+ source.sop.eq(sink.sop & first),
+ source.eop.eq(sink.eop & last)
+ ]
+
+
+class Pack(Module):
+ def __init__(self, layout_from, n, reverse=False):
+ self.sink = sink = Sink(layout_from)
+ description_to = copy(sink.description)
+ description_to.payload_layout = pack_layout(description_to.payload_layout, n)
+ self.source = source = Source(description_to)
+ self.busy = Signal()
+
+ ###
+
+ demux = Signal(max=n)
+
+ load_part = Signal()
+ strobe_all = Signal()
+ cases = {}
+ for i in range(n):
+ chunk = n-i-1 if reverse else i
+ cases[i] = [getattr(source.payload, "chunk"+str(chunk)).raw_bits().eq(sink.payload.raw_bits())]
+ self.comb += [
+ self.busy.eq(strobe_all),
+ sink.ack.eq(~strobe_all | source.ack),
+ source.stb.eq(strobe_all),
+ load_part.eq(sink.stb & sink.ack)
+ ]
+
+ if description_to.packetized:
+ demux_last = ((demux == (n - 1)) | sink.eop)
+ else:
+ demux_last = (demux == (n - 1))
+
+ self.sync += [
+ If(source.ack, strobe_all.eq(0)),
+ If(load_part,
+ Case(demux, cases),
+ If(demux_last,
+ demux.eq(0),
+ strobe_all.eq(1)
+ ).Else(
+ demux.eq(demux + 1)
+ )
+ )
+ ]
+
+ if description_to.packetized:
+ self.sync += [
+ If(source.stb & source.ack,
+ source.sop.eq(sink.sop),
+ source.eop.eq(sink.eop),
+ ).Elif(sink.stb & sink.ack,
+ source.sop.eq(sink.sop | source.sop),
+ source.eop.eq(sink.eop | source.eop)
+ )
+ ]
+
+
+class Chunkerize(CombinatorialActor):
+ def __init__(self, layout_from, layout_to, n, reverse=False):
+ self.sink = Sink(layout_from)
+ if isinstance(layout_to, EndpointDescription):
+ layout_to = copy(layout_to)
+ layout_to.payload_layout = pack_layout(layout_to.payload_layout, n)
+ else:
+ layout_to = pack_layout(layout_to, n)
+ self.source = Source(layout_to)
+ CombinatorialActor.__init__(self)
+
+ ###
+
+ for i in range(n):
+ chunk = n-i-1 if reverse else i
+ for f in self.sink.description.payload_layout:
+ src = getattr(self.sink, f[0])
+ dst = getattr(getattr(self.source, "chunk"+str(chunk)), f[0])
+ self.comb += dst.eq(src[i*len(src)//n:(i+1)*len(src)//n])
+
+
+class Unchunkerize(CombinatorialActor):
+ def __init__(self, layout_from, n, layout_to, reverse=False):
+ if isinstance(layout_from, EndpointDescription):
+ fields = layout_from.payload_layout
+ layout_from = copy(layout_from)
+ layout_from.payload_layout = pack_layout(layout_from.payload_layout, n)
+ else:
+ fields = layout_from
+ layout_from = pack_layout(layout_from, n)
+ self.sink = Sink(layout_from)
+ self.source = Source(layout_to)
+ CombinatorialActor.__init__(self)
+
+ ###
+
+ for i in range(n):
+ chunk = n-i-1 if reverse else i
+ for f in fields:
+ src = getattr(getattr(self.sink, "chunk"+str(chunk)), f[0])
+ dst = getattr(self.source, f[0])
+ self.comb += dst[i*len(dst)//n:(i+1)*len(dst)//n].eq(src)
+
+
+class Converter(Module):
+ def __init__(self, layout_from, layout_to, reverse=False):
+ self.sink = Sink(layout_from)
+ self.source = Source(layout_to)
+ self.busy = Signal()
+
+ ###
+
+ width_from = len(self.sink.payload.raw_bits())
+ width_to = len(self.source.payload.raw_bits())
+
+ # downconverter
+ if width_from > width_to:
+ if width_from % width_to:
+ raise ValueError
+ ratio = width_from//width_to
+ self.submodules.chunkerize = Chunkerize(layout_from, layout_to, ratio, reverse)
+ self.submodules.unpack = Unpack(ratio, layout_to)
+
+ self.comb += [
+ Record.connect(self.sink, self.chunkerize.sink),
+ Record.connect(self.chunkerize.source, self.unpack.sink),
+ Record.connect(self.unpack.source, self.source),
+ self.busy.eq(self.unpack.busy)
+ ]
+ # upconverter
+ elif width_to > width_from:
+ if width_to % width_from:
+ raise ValueError
+ ratio = width_to//width_from
+ self.submodules.pack = Pack(layout_from, ratio)
+ self.submodules.unchunkerize = Unchunkerize(layout_from, ratio, layout_to, reverse)
+
+ self.comb += [
+ Record.connect(self.sink, self.pack.sink),
+ Record.connect(self.pack.source, self.unchunkerize.sink),
+ Record.connect(self.unchunkerize.source, self.source),
+ self.busy.eq(self.pack.busy)
+ ]
+ # direct connection
+ else:
+ self.comb += Record.connect(self.sink, self.source)
+
+# XXX
projects / litex.git / commitdiff