357 lines
11 KiB
Python
357 lines
11 KiB
Python
"""
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Copyright (c) 2020 Alex Forencich
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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"""
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import logging
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from collections import deque
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import cocotb
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from cocotb.triggers import RisingEdge, FallingEdge, Timer, First, Event
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from cocotb.utils import get_sim_time, get_sim_steps
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from .version import __version__
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from .gmii import GmiiFrame
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from .constants import EthPre
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class RgmiiSource:
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def __init__(self, data, ctrl, clock, reset=None, enable=None, mii_select=None, *args, **kwargs):
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self.log = logging.getLogger(f"cocotb.{data._path}")
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self.data = data
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self.ctrl = ctrl
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self.clock = clock
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self.reset = reset
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self.enable = enable
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self.mii_select = mii_select
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self.log.info("RGMII source")
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self.log.info("cocotbext-eth version %s", __version__)
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self.log.info("Copyright (c) 2020 Alex Forencich")
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self.log.info("https://github.com/alexforencich/cocotbext-eth")
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super().__init__(*args, **kwargs)
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self.active = False
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self.queue = deque()
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self.ifg = 12
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self.mii_mode = False
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self.queue_occupancy_bytes = 0
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self.queue_occupancy_frames = 0
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self.width = 8
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self.byte_width = 1
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self.reset = reset
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assert len(self.data) == 4
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self.data.setimmediatevalue(0)
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assert len(self.ctrl) == 1
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self.ctrl.setimmediatevalue(0)
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cocotb.fork(self._run())
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async def send(self, frame):
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self.send_nowait(frame)
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def send_nowait(self, frame):
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frame = GmiiFrame(frame)
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self.queue_occupancy_bytes += len(frame)
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self.queue_occupancy_frames += 1
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self.queue.append(frame)
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def count(self):
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return len(self.queue)
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def empty(self):
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return not self.queue
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def idle(self):
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return self.empty() and not self.active
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async def wait(self):
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while not self.idle():
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await RisingEdge(self.clock)
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async def _run(self):
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frame = None
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ifg_cnt = 0
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self.active = False
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d = 0
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er = 0
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en = 0
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while True:
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await RisingEdge(self.clock)
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if self.reset is not None and self.reset.value:
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frame = None
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ifg_cnt = 0
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self.active = False
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self.data <= 0
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self.ctrl <= 0
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continue
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if not self.mii_mode:
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# send high nibble after rising edge, leading in to falling edge
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self.data <= d >> 4
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self.ctrl <= en ^ er
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if self.enable is None or self.enable.value:
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if ifg_cnt > 0:
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# in IFG
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ifg_cnt -= 1
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elif frame is None and self.queue:
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# send frame
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frame = self.queue.popleft()
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self.queue_occupancy_bytes -= len(frame)
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self.queue_occupancy_frames -= 1
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self.log.info("TX frame: %s", frame)
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frame.normalize()
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if self.mii_select is not None:
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self.mii_mode = bool(self.mii_select.value.integer)
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if self.mii_mode:
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mii_data = []
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mii_error = []
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for b, e in zip(frame.data, frame.error):
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mii_data.append(b & 0x0F)
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mii_data.append(b >> 4)
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mii_error.append(e)
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mii_error.append(e)
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frame.data = mii_data
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frame.error = mii_error
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self.active = True
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if frame is not None:
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d = frame.data.pop(0)
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er = frame.error.pop(0)
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en = 1
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if not frame.data:
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ifg_cnt = max(self.ifg, 1)
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frame = None
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else:
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d = 0
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er = 0
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en = 0
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self.active = False
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await FallingEdge(self.clock)
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# send low nibble after falling edge, leading in to rising edge
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self.data <= d & 0x0F
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self.ctrl <= en
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class RgmiiSink:
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def __init__(self, data, ctrl, clock, reset=None, enable=None, mii_select=None, *args, **kwargs):
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self.log = logging.getLogger(f"cocotb.{data._path}")
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self.data = data
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self.ctrl = ctrl
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self.clock = clock
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self.reset = reset
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self.enable = enable
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self.mii_select = mii_select
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self.log.info("RGMII sink")
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self.log.info("cocotbext-eth version %s", __version__)
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self.log.info("Copyright (c) 2020 Alex Forencich")
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self.log.info("https://github.com/alexforencich/cocotbext-eth")
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super().__init__(*args, **kwargs)
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self.active = False
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self.queue = deque()
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self.sync = Event()
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self.mii_mode = False
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self.queue_occupancy_bytes = 0
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self.queue_occupancy_frames = 0
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self.width = 8
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self.byte_width = 1
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self.reset = reset
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assert len(self.data) == 4
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assert len(self.ctrl) == 1
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cocotb.fork(self._run())
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async def recv(self, compact=True):
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while self.empty():
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self.sync.clear()
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await self.sync.wait()
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return self.recv_nowait(compact)
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def recv_nowait(self, compact=True):
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if self.queue:
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frame = self.queue.popleft()
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self.queue_occupancy_bytes -= len(frame)
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self.queue_occupancy_frames -= 1
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return frame
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return None
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def count(self):
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return len(self.queue)
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def empty(self):
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return not self.queue
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def idle(self):
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return not self.active
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async def wait(self, timeout=0, timeout_unit=None):
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if not self.empty():
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return
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self.sync.clear()
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if timeout:
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await First(self.sync.wait(), Timer(timeout, timeout_unit))
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else:
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await self.sync.wait()
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async def _run(self):
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frame = None
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self.active = False
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d_val = 0
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dv_val = 0
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er_val = 0
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while True:
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await RisingEdge(self.clock)
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# capture low nibble on rising edge
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d_val = self.data.value.integer
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dv_val = self.ctrl.value.integer
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await FallingEdge(self.clock)
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if self.reset is not None and self.reset.value:
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frame = None
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self.active = False
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continue
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# capture high nibble on falling edge
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d_val |= self.data.value.integer << 4
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er_val = dv_val ^ self.ctrl.value.integer
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if self.enable is None or self.enable.value:
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if frame is None:
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if dv_val:
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# start of frame
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frame = GmiiFrame(bytearray(), [])
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frame.rx_sim_time = get_sim_time()
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else:
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if not dv_val:
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# end of frame
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if self.mii_select is not None:
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self.mii_mode = bool(self.mii_select.value.integer)
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if self.mii_mode:
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odd = True
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sync = False
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b = 0
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be = 0
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data = bytearray()
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error = []
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for n, e in zip(frame.data, frame.error):
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odd = not odd
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b = (n & 0x0F) << 4 | b >> 4
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be |= e
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if not sync and b == EthPre.SFD:
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odd = True
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sync = True
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if odd:
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data.append(b)
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error.append(be)
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be = 0
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frame.data = data
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frame.error = error
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frame.compact()
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self.log.info("RX frame: %s", frame)
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self.queue_occupancy_bytes += len(frame)
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self.queue_occupancy_frames += 1
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self.queue.append(frame)
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self.sync.set()
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frame = None
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if frame is not None:
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frame.data.append(d_val)
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frame.error.append(er_val)
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class RgmiiPhy:
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def __init__(self, txd, tx_ctl, tx_clk, rxd, rx_ctl, rx_clk, reset=None, speed=1000e6, *args, **kwargs):
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self.tx_clk = tx_clk
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self.rx_clk = rx_clk
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self.tx = RgmiiSink(txd, tx_ctl, tx_clk, reset)
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self.rx = RgmiiSource(rxd, rx_ctl, rx_clk, reset)
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self.rx_clk.setimmediatevalue(0)
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self._clock_cr = None
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self.set_speed(speed)
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def set_speed(self, speed):
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if speed in (10e6, 100e6, 1000e6):
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self.speed = speed
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else:
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raise ValueError("Invalid speed selection")
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if self._clock_cr is not None:
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self._clock_cr.kill()
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if self.speed == 1000e6:
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self._clock_cr = cocotb.fork(self._run_clock(8*1e9/self.speed))
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self.tx.mii_mode = False
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self.rx.mii_mode = False
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else:
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self._clock_cr = cocotb.fork(self._run_clock(4*1e9/self.speed))
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self.tx.mii_mode = True
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self.rx.mii_mode = True
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async def _run_clock(self, period):
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half_period = get_sim_steps(period / 2.0, 'ns')
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t = Timer(half_period)
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while True:
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await t
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self.rx_clk <= 1
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await t
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self.rx_clk <= 0
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