70 lines
1.5 KiB
Python
70 lines
1.5 KiB
Python
from migen.fhdl.std 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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class EndpointReporter(Module, AutoCSR):
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def __init__(self, endpoint, nbits):
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self.reset = Signal()
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self.freeze = Signal()
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self._ack_count = CSRStatus(nbits)
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self._nack_count = CSRStatus(nbits)
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self._cur_status = CSRStatus(2)
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###
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stb = Signal()
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ack = Signal()
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self.comb += self._cur_status.status.eq(Cat(stb, ack))
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ack_count = Signal(nbits)
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nack_count = Signal(nbits)
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self.sync += [
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# register monitored signals
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stb.eq(endpoint.stb),
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ack.eq(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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If(~self.freeze,
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self._ack_count.status.eq(ack_count),
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self._nack_count.status.eq(nack_count)
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)
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]
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class DFGReporter(DFGHook, AutoCSR):
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def __init__(self, dfg, nbits):
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self._magic = CSRStatus(16)
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self._neps = CSRStatus(8)
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self._nbits = CSRStatus(8)
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self._freeze = CSRStorage()
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self._reset = CSR()
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###
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DFGHook.__init__(self, dfg,
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lambda u, ep, v: EndpointReporter(getattr(u, ep), nbits))
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hooks = list(self.hooks_iter())
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self.comb += [
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self._magic.status.eq(ISD_MAGIC),
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self._neps.status.eq(len(hooks)),
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self._nbits.status.eq(nbits)
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]
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for h in hooks:
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self.comb += [
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h.freeze.eq(self._freeze.storage),
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h.reset.eq(self._reset.re)
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]
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