mirror of
https://github.com/AsahiLinux/m1n1
synced 2024-12-22 03:33:05 +00:00
27e1499c72
Add utility accessor to the host kernel's regmaps -- allowing one to use m1n1 RegMaps with the internal regmap structures of the host kernel, poking behind the back of in-development kernel drivers. Signed-off-by: Martin Povišer <povik@protonmail.com>
84 lines
2.6 KiB
Python
84 lines
2.6 KiB
Python
# SPDX-License-Identifier: MIT
|
|
from pathlib import Path
|
|
import os
|
|
|
|
class KernelRegmapAccessor:
|
|
def __init__(self, name):
|
|
self.path = self._find_path(name)
|
|
self.read_ranges()
|
|
self.read_linelen()
|
|
|
|
@classmethod
|
|
def _find_path(cls, name):
|
|
basedir = Path("/sys/kernel/debug/regmap")
|
|
|
|
if (path := Path(name)).exists():
|
|
return path
|
|
elif (path := basedir.joinpath(name)).exists():
|
|
return path
|
|
elif name in (available := cls._list_regmaps(basedir)):
|
|
return available[name]
|
|
else:
|
|
raise ValueError(f"kernel regmap not found: {name}")
|
|
|
|
@classmethod
|
|
def _list_regmaps(cls, basedir):
|
|
return {
|
|
p.joinpath("name").open("rb").read().strip().decode(): p
|
|
for p in basedir.iterdir() if p.is_dir()
|
|
}
|
|
|
|
def open_node(self, name, mode="rb", **kwargs):
|
|
return self.path.joinpath(name).open(mode, **kwargs)
|
|
|
|
def read_ranges(self):
|
|
with self.open_node("range") as f:
|
|
self.ranges = [
|
|
range(int(a, 16), int(b, 16) + 1)
|
|
for a, b in (l.strip().split(b"-") for l in f)
|
|
]
|
|
|
|
def read_linelen(self):
|
|
with self.open_node("registers", buffering=0) as f:
|
|
l = f.read(64).split(b"\n")[0]
|
|
valstr = l.split(b":")[1].strip()
|
|
self.linelen = len(l) + 1
|
|
self.working_width = len(valstr) * 4
|
|
|
|
def _find_off(self, reg):
|
|
off = 0
|
|
for r in self.ranges:
|
|
if reg >= r.stop:
|
|
off += r.stop - r.start
|
|
else:
|
|
off += reg - r.start
|
|
break
|
|
if reg not in r:
|
|
raise ValueError(f"register {reg:04x} out of range")
|
|
return off * self.linelen
|
|
|
|
def read(self, reg, width=None):
|
|
assert width == self.working_width
|
|
with self.open_node("registers", buffering=0) as f:
|
|
f.seek(self._find_off(reg))
|
|
l = f.read(self.linelen)
|
|
regstr, valstr = l.split(b":")
|
|
assert int(regstr, 16) == reg
|
|
return int(valstr, 16)
|
|
|
|
def write(self, reg, val, width=None):
|
|
assert width == self.working_width
|
|
with self.open_node("registers", mode="wb") as f:
|
|
f.write(f"{reg:x} {val:x}".encode())
|
|
|
|
def require_debugfs():
|
|
if os.path.ismount("/sys/kernel/debug"):
|
|
return
|
|
os.system("mount -t debugfs none /sys/kernel/debug")
|
|
|
|
if __name__ == "__main__":
|
|
require_debugfs()
|
|
from m1n1.hw.codecs import TAS5770Regs
|
|
tas = TAS5770Regs(KernelRegmapAccessor("tas2770"), 0)
|
|
import code
|
|
code.interact(local=locals())
|