85 lines
2.5 KiB
Python
85 lines
2.5 KiB
Python
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from migen.fhdl.structure import *
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from migen.bank.description import *
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from migen.flow.hooks import DFGHook
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ISD_MAGIC = 0x6ab4
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# TODO: add freeze
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class EndpointReporter:
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def __init__(self, endpoint, nbits):
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self.endpoint = endpoint
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self.reset = Signal()
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self._ack_count = RegisterField("ack_count", nbits, access_bus=READ_ONLY, access_dev=WRITE_ONLY)
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self._nack_count = RegisterField("nack_count", nbits, access_bus=READ_ONLY, access_dev=WRITE_ONLY)
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self._cur_stb = Field("cur_stb", 1, access_bus=READ_ONLY, access_dev=WRITE_ONLY)
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self._cur_ack = Field("cur_ack", 1, access_bus=READ_ONLY, access_dev=WRITE_ONLY)
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self._cur_status = RegisterFields("cur_status", [self._cur_stb, self._cur_ack])
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def get_registers(self):
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return [self._ack_count, self._nack_count, self._cur_status]
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def get_fragment(self):
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stb = Signal()
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ack = Signal()
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ack_count = self._ack_count.field.w
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nack_count = self._nack_count.field.w
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comb = [
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self._cur_stb.w.eq(stb),
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self._cur_ack.w.eq(ack)
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]
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sync = [
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# register monitored signals
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stb.eq(self.endpoint.stb),
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ack.eq(self.endpoint.ack),
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# count operations
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If(self.reset,
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ack_count.eq(0),
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nack_count.eq(0)
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).Else(
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If(stb,
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If(ack,
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ack_count.eq(ack_count + 1)
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).Else(
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nack_count.eq(nack_count + 1)
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)
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)
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)
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]
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return Fragment(comb, sync)
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class DFGReporter(DFGHook):
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def __init__(self, dfg, nbits):
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self._nbits = nbits
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self._r_magic = RegisterField("magic", 16, access_bus=READ_ONLY, access_dev=WRITE_ONLY)
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self._r_neps = RegisterField("neps", 8, access_bus=READ_ONLY, access_dev=WRITE_ONLY)
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self._r_nbits = RegisterField("nbits", 8, access_bus=READ_ONLY, access_dev=WRITE_ONLY)
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self._r_reset = RegisterRaw("reset", 1)
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self.order = []
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super().__init__(dfg, self._create)
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def _create(self, u, ep, v):
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self.order.append((u, ep, v))
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return EndpointReporter(u.actor.endpoints[ep], self._nbits)
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def print_map(self):
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for n, (u, ep, v) in enumerate(self.order):
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print("#" + str(n) + ": " + str(u) + ":" + ep + " -> " + str(v))
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def get_registers(self):
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registers = [self._r_magic, self._r_neps, self._r_nbits, self._r_reset]
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for u, ep, v in self.order:
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registers += self.nodepair_to_ep[(u, v)][ep].get_registers()
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return registers
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def get_fragment(self):
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comb = [
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self._r_magic.field.w.eq(ISD_MAGIC),
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self._r_neps.field.w.eq(len(self.order)),
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self._r_nbits.field.w.eq(self._nbits)
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]
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comb += [h.reset.eq(self._r_reset.re) for h in self.hooks_iter()]
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return Fragment(comb) + super().get_fragment()
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