mirror of
https://github.com/AsahiLinux/m1n1
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2b4ed4abbf
Interface (as used by macOS) is simple enough to skip register definitions. Signed-off-by: Janne Grunau <j@jannau.net>
119 lines
3.4 KiB
Python
119 lines
3.4 KiB
Python
# SPDX-License-Identifier: MIT
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from enum import Enum
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from m1n1.trace.i2c import I2CTracer, I2CDevTracer
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class HpmTracer(I2CDevTracer):
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class State(Enum):
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UNKNOWN = 0
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REQUEST = 1
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WRITE = 2
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READ = 3
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def __init__(self, addr=128, name=None, verbose=True):
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print(f"CD3217Tracer.__init__(addr={addr}, name={name}, verbose={verbose})")
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super().__init__(addr, name, verbose)
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self.reset()
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def reset(self):
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self.reg = None
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self.state = CD3217Tracer.State.UNKNOWN
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self.length = None
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self.data = []
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def start(self, addr, read):
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if addr != self.addr:
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return
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if self.state == CD3217Tracer.State.UNKNOWN:
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if read:
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self.state = CD3217Tracer.State.READ
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else:
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self.state = CD3217Tracer.State.REQUEST
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elif self.state == CD3217Tracer.State.REQUEST and read:
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pass
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else:
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self.log(f"unexpected state in start(read={read}): state:{self.state} reg:{self.reg} data:{self.data}")
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def stop(self):
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if self.state == CD3217Tracer.State.REQUEST and len(self.data) == 0:
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return
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msg = f"Txn: {self.addr:02x}."
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if self.state == CD3217Tracer.State.REQUEST:
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msg += f"r [{self.reg:02x}]"
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elif self.state == CD3217Tracer.State.WRITE:
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msg += f"w [{self.reg:02x}]"
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elif self.state == CD3217Tracer.State.READ:
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msg += f"r [xx]"
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else:
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self.log(f"unexpected state in stop(): state:{self.state} reg:{self.reg} data:{self.data}")
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self.reset()
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return
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# only for debugging as some mismatches are expected as
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# cd3217 seems to report the register size and not the number
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# of requested bytes (or I2CDevTracer truncates reads).
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#if self.length is not None and self.length > len(self.data):
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# self.log(f"length {self.length:02x} mismatch received data: {len(self.data):02x}")
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for data in self.data:
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msg += f" {data:02x}"
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self.log(msg)
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self.reset()
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def read(self, data):
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self.data.append(data)
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def write(self, data):
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if self.reg is None:
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self.reg = data
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elif self.length is None:
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self.length = data
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self.state = CD3217Tracer.State.WRITE
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else:
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self.data.append(data)
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class CD3217Tracer(HpmTracer):
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def read(self, data):
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if self.length is None:
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self.length = data - 1
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else:
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self.data.append(data)
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i2c_tracers = {}
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for node in hv.adt["/arm-io"]:
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if not node.name.startswith("i2c"):
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continue
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n = int(node.name[3:])
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bus = I2CTracer(hv, f"/arm-io/{node.name}")
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for mngr_node in node:
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if "compatible" not in mngr_node._properties: # thanks Apple
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continue
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if mngr_node.compatible[0] != "usbc,manager":
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continue
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addr = mngr_node.reg[0] & 0xff
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bus.add_device(addr, HpmTracer(addr=addr, name=mngr_node.name))
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for devnode in mngr_node:
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dcls = {
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"usbc,cd3217": CD3217Tracer,
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}.get(devnode.compatible[0], None)
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if dcls:
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addr = devnode.hpm_iic_addr & 0xff
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bus.add_device(addr, dcls(addr=addr, name=devnode.name))
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if len(bus.state.devices) > 1:
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i2c_tracers[n] = bus
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for bus in i2c_tracers.values():
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bus.start()
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