mirror of https://gitee.com/openkylin/linux.git
71 lines
2.5 KiB
ReStructuredText
71 lines
2.5 KiB
ReStructuredText
|
Kernel driver mlxreg-fan
|
||
|
========================
|
||
|
|
||
|
Provides FAN control for the next Mellanox systems:
|
||
|
|
||
|
- QMB700, equipped with 40x200GbE InfiniBand ports;
|
||
|
- MSN3700, equipped with 32x200GbE or 16x400GbE Ethernet ports;
|
||
|
- MSN3410, equipped with 6x400GbE plus 48x50GbE Ethernet ports;
|
||
|
- MSN3800, equipped with 64x1000GbE Ethernet ports;
|
||
|
|
||
|
Author: Vadim Pasternak <vadimp@mellanox.com>
|
||
|
|
||
|
These are the Top of the Rack systems, equipped with Mellanox switch
|
||
|
board with Mellanox Quantum or Spectrume-2 devices.
|
||
|
FAN controller is implemented by the programmable device logic.
|
||
|
|
||
|
The default registers offsets set within the programmable device is as
|
||
|
following:
|
||
|
|
||
|
======================= ====
|
||
|
pwm1 0xe3
|
||
|
fan1 (tacho1) 0xe4
|
||
|
fan2 (tacho2) 0xe5
|
||
|
fan3 (tacho3) 0xe6
|
||
|
fan4 (tacho4) 0xe7
|
||
|
fan5 (tacho5) 0xe8
|
||
|
fan6 (tacho6) 0xe9
|
||
|
fan7 (tacho7) 0xea
|
||
|
fan8 (tacho8) 0xeb
|
||
|
fan9 (tacho9) 0xec
|
||
|
fan10 (tacho10) 0xed
|
||
|
fan11 (tacho11) 0xee
|
||
|
fan12 (tacho12) 0xef
|
||
|
======================= ====
|
||
|
|
||
|
This setup can be re-programmed with other registers.
|
||
|
|
||
|
Description
|
||
|
-----------
|
||
|
|
||
|
The driver implements a simple interface for driving a fan connected to
|
||
|
a PWM output and tachometer inputs.
|
||
|
This driver obtains PWM and tachometers registers location according to
|
||
|
the system configuration and creates FAN/PWM hwmon objects and a cooling
|
||
|
device. PWM and tachometers are sensed through the on-board programmable
|
||
|
device, which exports its register map. This device could be attached to
|
||
|
any bus type, for which register mapping is supported.
|
||
|
Single instance is created with one PWM control, up to 12 tachometers and
|
||
|
one cooling device. It could be as many instances as programmable device
|
||
|
supports.
|
||
|
The driver exposes the fan to the user space through the hwmon's and
|
||
|
thermal's sysfs interfaces.
|
||
|
|
||
|
/sys files in hwmon subsystem
|
||
|
-----------------------------
|
||
|
|
||
|
================= == ===================================================
|
||
|
fan[1-12]_fault RO files for tachometers TACH1-TACH12 fault indication
|
||
|
fan[1-12]_input RO files for tachometers TACH1-TACH12 input (in RPM)
|
||
|
pwm1 RW file for fan[1-12] target duty cycle (0..255)
|
||
|
================= == ===================================================
|
||
|
|
||
|
/sys files in thermal subsystem
|
||
|
-------------------------------
|
||
|
|
||
|
================= == ====================================================
|
||
|
cur_state RW file for current cooling state of the cooling device
|
||
|
(0..max_state)
|
||
|
max_state RO file for maximum cooling state of the cooling device
|
||
|
================= == ====================================================
|