Linux FlexNoc PM Driver
- shubhro (Unlicensed)
- Shubhrajyoti Datta (Unlicensed)
Table of Contents
Note: The driver is deleted.
Introduction:
Linux Versal FlexNoc Driver. The following section describes the hardware as well as the software design.
Basic HW Architecture:
Xilinx FlexNoc Interconnect has counters to monitor various interfaces.
There are 2 instances of the FlexNoC one in the LPD and one in the FPD.
Kernel Configuration
To enable FlexNoc driver in the kernel, the following configuration options need to be enabled:
CONFIG_XILINX_FLEX_PM=y |
SW Architecture:
The FLexNOc driver gives the user access to the various counters to monitor the interfaces.
Device Tree:
Example Device Tree looks as follows:
apm: performance-monitor@f0920000 {
compatible = "xlnx,flexnoc-pm-2.7";
status = "disabled";
reg-names = "funnel", "baselpd", "basefpd";
reg = <0x0 0xf0920000 0x0 0x1000>,
<0x0 0xf0980000 0x0 0x9000>,
<0x0 0xf0b80000 0x0 0x9000>;
};
|
Current Supported Features:
Temperature Channels:
FPD and LPD Monitors.
Counter reading
Reading a counter value:
_
root@xilinx-vc-p-a2197-00-reva-x-prc-01-reva-2019_2:/sys/bus/platform/devices/f0920000.flex# echo 0 > counteridlpd
root@xilinx-vc-p-a2197-00-reva-x-prc-01-reva-2019_2:/sys/bus/platform/devices/f0920000.flex# cat counterlpd_*
201
217
224
231 |
Port Selection:
The port select Options
Below are the values that are there for the various paths
RPU_clk:
TracePortSel 0 :Datapath Link:/lpd_afifs_axi - 0x8000_0000
TracePortSel 1 :Datapath Link:/lpd_ocm - 0xFFFD_0000
TracePortSel 2 :Datapath Link:/lpd_ocmext - 0xFE80_0000
TracePortSel 3 :Datapath Link:/lpd_pmc_rpu_axi0 - 0x0000_0000
Lpdswitch_main_clk:
TracePortSel 0 :Datapath Link:/lpdfpd_axi - 0xB000_0000
TracePortSel 1 :Datapath Link:/prot_xppu - 0xFC00_0000
Change log
2020.2
f14566d - New driver added
2021.1
None
2021.2
None
2022.1
None
2022.1
d27d39925b95 -Deprecate the driver
2023.1
None
2023.2
Driver is deleted.
Mainline status
Not mainlined
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