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#
# Copyright 2017 Ettus Research, National Instruments Company
#
# SPDX-License-Identifier: GPL-3.0
#
"""
Liberio DMA dispatcher table control
"""
from builtins import str
from builtins import object
from .mpmlog import get_logger
from .uio import UIO
class LiberioDispatcherTable(object):
"""
Controls a Liberio DMA dispatcher table.
label -- A label that can be used by udev to find a UIO device
"""
def __init__(self, label):
self.log = get_logger(label)
self._regs = UIO(label=label, read_only=False)
self.poke32 = self._regs.poke32
self.peek32 = self._regs.peek32
def set_route(self, sid, dma_channel):
"""
Sets up routing in the Liberio dispatcher. From sid, only the
destination part is important. After this call, any CHDR packet with the
appropriate destination address will get routed to `dma_channel`.
sid -- Full SID, but only destination part matters.
dma_channel -- The DMA channel to which these packets should get routed.
"""
self.log.debug(
"Routing SID `{sid}' to DMA channel `{chan}'.".format(
sid=str(sid), chan=dma_channel
)
)
def poke_and_trace(addr, data):
" Do a poke32() and log.trace() "
self.log.trace("Writing to address 0x{:04X}: 0x{:04X}".format(
addr, data
))
self.poke32(addr, data)
# Poke reg for destination channel
try:
poke_and_trace(
0 + 4 * sid.dst_ep,
dma_channel,
)
except Exception as ex:
self.log.error(
"Unexpected exception while setting route: %s",
str(ex),
)
raise
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