litex/lib/sata/transport/__init__.py

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from lib.sata.common import *
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def _get_item(obj, name, width):
if "_lsb" in name:
item = getattr(obj, name.replace("_lsb", ""))[:width]
elif "_msb" in name:
item = getattr(obj, name.replace("_msb", ""))[width:2*width]
else:
item = getattr(obj, name)
return item
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def _encode_cmd(obj, description, signal):
r = []
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for k, v in sorted(description.items()):
start = v.dword*32 + v.offset
end = start + v.width
item = _get_item(obj, k, v.width)
r.append(signal[start:end].eq(item))
return r
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class SATATransportTX(Module):
def __init__(self, link):
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self.sink = sink = Sink(transport_tx_description(32))
###
cmd_ndwords = max(fis_reg_h2d_cmd_len, fis_data_cmd_len)
encoded_cmd = Signal(cmd_ndwords*32)
counter = Counter(max=cmd_ndwords+1)
self.submodules += counter
cmd_len = Signal(counter.width)
cmd_with_data = Signal()
cmd_send = Signal()
data_send = Signal()
cmd_done = Signal()
def test_type(name):
return sink.type == fis_types[name]
fsm = FSM(reset_state="IDLE")
self.submodules += fsm
fsm.act("IDLE",
counter.reset.eq(1),
If(sink.stb & sink.sop,
If(test_type("REG_H2D"),
NextState("SEND_REG_H2D_CMD")
).Elif(test_type("DATA"),
NextState("SEND_DATA_CMD")
).Else(
sink.ack.eq(1)
)
).Else(
sink.ack.eq(1)
)
)
fsm.act("SEND_REG_H2D_CMD",
_encode_cmd(sink, fis_reg_h2d_layout, encoded_cmd),
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cmd_len.eq(fis_reg_h2d_cmd_len-1),
cmd_send.eq(1),
If(cmd_done,
sink.ack.eq(1),
NextState("IDLE")
)
)
fsm.act("SEND_DATA_CMD",
_encode_cmd(sink, fis_data_layout, encoded_cmd),
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cmd_len.eq(fis_data_cmd_len-1),
cmd_with_data.eq(1),
cmd_send.eq(1),
If(cmd_done,
NextState("SEND_DATA")
)
)
fsm.act("SEND_DATA",
data_send.eq(1),
sink.ack.eq(link.sink.ack),
If(sink.stb & sink.eop & sink.ack,
NextState("IDLE")
)
)
cmd_cases = {}
for i in range(cmd_ndwords):
cmd_cases[i] = [link.sink.d.eq(encoded_cmd[32*i:32*(i+1)])]
self.comb += \
If(cmd_send,
link.sink.stb.eq(sink.stb),
link.sink.sop.eq(counter.value == 0),
link.sink.eop.eq((counter.value == cmd_len) & ~cmd_with_data),
Case(counter.value, cmd_cases),
counter.ce.eq(sink.stb & link.sink.ack),
cmd_done.eq((counter.value == cmd_len) & link.sink.stb & link.sink.ack)
).Elif(data_send,
link.sink.stb.eq(sink.stb),
link.sink.sop.eq(0),
link.sink.eop.eq(sink.eop),
link.sink.d.eq(sink.data),
)
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def _decode_cmd(signal, description, obj):
r = []
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for k, v in sorted(description.items()):
start = v.dword*32+v.offset
end = start+v.width
item = _get_item(obj, k, v.width)
r.append(item.eq(signal[start:end]))
return r
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class SATATransportRX(Module):
def __init__(self, link):
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self.source = source = Source(transport_rx_description(32))
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###
cmd_ndwords = max(fis_reg_d2h_cmd_len, fis_dma_activate_d2h_cmd_len, fis_data_cmd_len)
encoded_cmd = Signal(cmd_ndwords*32)
counter = Counter(max=cmd_ndwords+1)
self.submodules += counter
cmd_len = Signal(counter.width)
cmd_receive = Signal()
data_receive = Signal()
cmd_done = Signal()
data_done = Signal()
def test_type(name):
return link.source.d[:8] == fis_types[name]
fsm = FSM(reset_state="IDLE")
self.submodules += fsm
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data_sop = Signal()
fsm.act("IDLE",
counter.reset.eq(1),
If(link.source.stb & link.source.sop,
If(test_type("REG_D2H"),
NextState("RECEIVE_REG_D2H_CMD")
).Elif(test_type("DMA_ACTIVATE_D2H"),
NextState("RECEIVE_DMA_ACTIVATE_D2H_CMD")
).Elif(test_type("DATA"),
NextState("RECEIVE_DATA_CMD"),
).Else(
link.source.ack.eq(1)
)
).Else(
link.source.ack.eq(1)
)
)
fsm.act("RECEIVE_REG_D2H_CMD",
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cmd_len.eq(fis_reg_d2h_cmd_len-1),
cmd_receive.eq(1),
If(cmd_done,
NextState("PRESENT_REG_D2H_CMD")
)
)
fsm.act("PRESENT_REG_D2H_CMD",
source.stb.eq(1),
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source.sop.eq(1),
source.eop.eq(1),
_decode_cmd(encoded_cmd, fis_reg_d2h_layout, source),
If(source.stb & source.ack,
NextState("IDLE")
)
)
fsm.act("RECEIVE_DMA_ACTIVATE_D2H_CMD",
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cmd_len.eq(fis_dma_activate_d2h_cmd_len-1),
cmd_receive.eq(1),
If(cmd_done,
NextState("PRESENT_DMA_ACTIVATE_D2H_CMD")
)
)
fsm.act("PRESENT_DMA_ACTIVATE_D2H_CMD",
source.stb.eq(1),
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source.sop.eq(1),
source.eop.eq(1),
_decode_cmd(encoded_cmd, fis_dma_activate_d2h_layout, source),
If(source.stb & source.ack,
NextState("IDLE")
)
)
fsm.act("RECEIVE_DATA_CMD",
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cmd_len.eq(fis_data_cmd_len-1),
cmd_receive.eq(1),
If(cmd_done,
NextState("PRESENT_DATA")
)
)
fsm.act("PRESENT_DATA",
data_receive.eq(1),
source.stb.eq(link.source.stb),
_decode_cmd(encoded_cmd, fis_data_layout, source),
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source.sop.eq(data_sop),
source.eop.eq(link.source.eop),
source.data.eq(link.source.d),
If(source.stb & source.eop & source.ack,
NextState("IDLE")
)
)
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self.sync += \
If(fsm.ongoing("RECEIVE_DATA_CMD"),
data_sop.eq(1)
).Elif(fsm.ongoing("PRESENT_DATA"),
If(source.stb & source.ack,
data_sop.eq(0)
)
)
cmd_cases = {}
for i in range(cmd_ndwords):
cmd_cases[i] = [encoded_cmd[32*i:32*(i+1)].eq(link.source.d)]
self.comb += \
If(cmd_receive & link.source.stb,
counter.ce.eq(1)
)
self.sync += \
If(cmd_receive,
Case(counter.value, cmd_cases),
)
self.comb += cmd_done.eq((counter.value == cmd_len) & link.source.ack)
self.comb += link.source.ack.eq(cmd_receive | (data_receive & source.ack))
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class SATATransport(Module):
def __init__(self, link):
self.tx = SATATransportTX(link)
self.rx = SATATransportRX(link)
self.sink, self.source = self.tx.sink, self.rx.source