asmibus: remove port sharing

diff --git a/migen/bus/asmibus.py b/migen/bus/asmibus.py
index 2ddabbe80f8b3ff8a36a08832af32c9bcde7f30f..77b0fc39015b325ad2f283f4791df026600e6dea 100644 (file)
--- a/migen/bus/asmibus.py
+++ b/migen/bus/asmibus.py
@@ -302,83 +302,3 @@ class Target(Module):
                else:
                        s.wr(self.hub.call, 0)
                        self._calling_tag = -1
-
-# Port sharing
-
-class SharedPort:
-       def __init__(self, base_port):
-               if not base_port.finalized:
-                       raise FinalizeError
-               self.finalized = True
-
-               nslots = len(base_port.slots)
-
-               self.hub = base_port.hub
-               self.base = base_port.base
-               # 1 if that slot is assigned to us
-               self.slots = [Signal() for i in range(nslots)]
-               
-               # request issuance
-               self.adr = Signal(self.hub.aw)
-               self.we = Signal()
-               self.stb = Signal()
-               if nslots > 1:
-                       self.tag_issue = Signal(max=nslots)
-               self.ack = Signal()
-               
-               # request completion
-               self.call = Signal()
-               self.tag_call = Signal(self.hub.tagbits)
-               self.dat_r = Signal(self.hub.dw)
-               self.dat_w = Signal(self.hub.dw)
-               self.dat_wm = Signal(self.hub.dw//8)
-
-       def get_call_expression(self, slotn=0):
-               if not self.finalized:
-                       raise FinalizeError
-               return self.call \
-                       & (self.tag_call == (self.base + slotn))
-
-class PortSharer(Module):
-       def __init__(self, base_port, nshares):
-               self.shared_ports = [SharedPort(base_port) for i in range(nshares)]
-
-               ###
-
-               # request issuance
-               self.submodules.rr = roundrobin.RoundRobin(nshares, roundrobin.SP_CE)
-               self.comb += [
-                       self.rr.request.eq(Cat(*[sp.stb for sp in self.shared_ports])),
-                       self.rr.ce.eq(base_port.ack)
-               ]
-               self.comb += [
-                       base_port.adr.eq(Array(sp.adr for sp in self.shared_ports)[self.rr.grant]),
-                       base_port.we.eq(Array(sp.we for sp in self.shared_ports)[self.rr.grant]),
-                       base_port.stb.eq(Array(sp.stb for sp in self.shared_ports)[self.rr.grant]),
-               ]
-               if hasattr(base_port, "tag_issue"):
-                       self.comb += [sp.tag_issue.eq(base_port.tag_issue) for sp in self.shared_ports]
-               self.comb += [sp.ack.eq(base_port.ack & (self.rr.grant == n)) for n, sp in enumerate(self.shared_ports)]
-
-               # request completion
-               self.comb += [sp.call.eq(base_port.call & Array(sp.slots)[base_port.tag_call-base_port.base])
-                       for sp in self.shared_ports]
-               self.comb += [sp.tag_call.eq(base_port.tag_call) for sp in self.shared_ports]
-               self.comb += [sp.dat_r.eq(base_port.dat_r) for sp in self.shared_ports]
-               self.comb += [
-                       base_port.dat_w.eq(optree("|", [sp.dat_w for sp in self.shared_ports])),
-                       base_port.dat_wm.eq(optree("|", [sp.dat_wm for sp in self.shared_ports])),
-               ]
-               
-               # request ownership tracking
-               if hasattr(base_port, "tag_issue"):
-                       for sp in self.shared_ports:
-                               self.sync += If(sp.stb & sp.ack, Array(sp.slots)[sp.tag_issue].eq(1))
-                               for n, slot in enumerate(sp.slots):
-                                       self.sync += If(base_port.call & (base_port.tag_call == (base_port.base + n)), slot.eq(0))
-               else:
-                       for sp in self.shared_ports:
-                               self.sync += [
-                                       If(sp.stb & sp.ack, sp.slots[0].eq(1)),
-                                       If(base_port.call & (base_port.tag_call == base_port.base), sp.slots[0].eq(0))
-                               ]