128 lines
3.5 KiB
Plaintext
128 lines
3.5 KiB
Plaintext
What: /sys/kernel/debug/dcc/.../ready
|
|
Date: December 2022
|
|
Contact: Souradeep Chowdhury <quic_schowdhu@quicinc.com>
|
|
Description:
|
|
This file is used to check the status of the dcc
|
|
hardware if it's ready to receive user configurations.
|
|
A 'Y' here indicates dcc is ready.
|
|
|
|
What: /sys/kernel/debug/dcc/.../trigger
|
|
Date: December 2022
|
|
Contact: Souradeep Chowdhury <quic_schowdhu@quicinc.com>
|
|
Description:
|
|
This is the debugfs interface for manual software
|
|
triggers. The trigger can be invoked by writing '1'
|
|
to the file.
|
|
|
|
What: /sys/kernel/debug/dcc/.../config_reset
|
|
Date: December 2022
|
|
Contact: Souradeep Chowdhury <quic_schowdhu@quicinc.com>
|
|
Description:
|
|
This file is used to reset the configuration of
|
|
a dcc driver to the default configuration. When '1'
|
|
is written to the file, all the previous addresses
|
|
stored in the driver gets removed and users need to
|
|
reconfigure addresses again.
|
|
|
|
What: /sys/kernel/debug/dcc/.../[list-number]/config
|
|
Date: December 2022
|
|
Contact: Souradeep Chowdhury <quic_schowdhu@quicinc.com>
|
|
Description:
|
|
This stores the addresses of the registers which
|
|
can be read in case of a hardware crash or manual
|
|
software triggers. The input addresses type
|
|
can be one of following dcc instructions: read,
|
|
write, read-write, and loop type. The lists need to
|
|
be configured sequentially and not in a overlapping
|
|
manner; e.g. users can jump to list x only after
|
|
list y is configured and enabled. The input format for
|
|
each type is as follows:
|
|
|
|
i) Read instruction
|
|
|
|
::
|
|
|
|
echo R <addr> <n> <bus> >/sys/kernel/debug/dcc/../[list-number]/config
|
|
|
|
where:
|
|
|
|
<addr>
|
|
The address to be read.
|
|
|
|
<n>
|
|
The addresses word count, starting from address <1>.
|
|
Each word is 32 bits (4 bytes). If omitted, defaulted
|
|
to 1.
|
|
|
|
<bus type>
|
|
The bus type, which can be either 'apb' or 'ahb'.
|
|
The default is 'ahb' if leaved out.
|
|
|
|
ii) Write instruction
|
|
|
|
::
|
|
|
|
echo W <addr> <n> <bus type> > /sys/kernel/debug/dcc/../[list-number]/config
|
|
|
|
where:
|
|
|
|
<addr>
|
|
The address to be written.
|
|
|
|
<n>
|
|
The value to be written at <addr>.
|
|
|
|
<bus type>
|
|
The bus type, which can be either 'apb' or 'ahb'.
|
|
|
|
iii) Read-write instruction
|
|
|
|
::
|
|
|
|
echo RW <addr> <n> <mask> > /sys/kernel/debug/dcc/../[list-number]/config
|
|
|
|
where:
|
|
|
|
<addr>
|
|
The address to be read and written.
|
|
|
|
<n>
|
|
The value to be written at <addr>.
|
|
|
|
<mask>
|
|
The value mask.
|
|
|
|
iv) Loop instruction
|
|
|
|
::
|
|
|
|
echo L <loop count> <address count> <address>... > /sys/kernel/debug/dcc/../[list-number]/config
|
|
|
|
where:
|
|
|
|
<loop count>
|
|
Number of iterations
|
|
|
|
<address count>
|
|
total number of addresses to be written
|
|
|
|
<address>
|
|
Space-separated list of addresses.
|
|
|
|
What: /sys/kernel/debug/dcc/.../[list-number]/enable
|
|
Date: December 2022
|
|
Contact: Souradeep Chowdhury <quic_schowdhu@quicinc.com>
|
|
Description:
|
|
This debugfs interface is used for enabling the
|
|
the dcc hardware. A file named "enable" is in the
|
|
directory list number where users can enable/disable
|
|
the specific list by writing boolean (1 or 0) to the
|
|
file.
|
|
|
|
On enabling the dcc, all the addresses specified
|
|
by the user for the corresponding list is written
|
|
into dcc sram which is read by the dcc hardware
|
|
on manual or crash induced triggers. Lists must
|
|
be configured and enabled sequentially, e.g. list
|
|
2 can only be enabled when list 1 have so.
|