1 Kernel driver mlxreg-fan 2 ======================== 3 4 Provides FAN control for the next Mellanox systems: 5 6 - QMB700, equipped with 40x200GbE InfiniBand ports; 7 - MSN3700, equipped with 32x200GbE or 16x400GbE Ethernet ports; 8 - MSN3410, equipped with 6x400GbE plus 48x50GbE Ethernet ports; 9 - MSN3800, equipped with 64x1000GbE Ethernet ports; 10 11 Author: Vadim Pasternak <vadimp@mellanox.com> 12 13 These are the Top of the Rack systems, equipped with Mellanox switch 14 board with Mellanox Quantum or Spectrume-2 devices. 15 FAN controller is implemented by the programmable device logic. 16 17 The default registers offsets set within the programmable device is as 18 following: 19 20 ======================= ==== 21 pwm1 0xe3 22 fan1 (tacho1) 0xe4 23 fan2 (tacho2) 0xe5 24 fan3 (tacho3) 0xe6 25 fan4 (tacho4) 0xe7 26 fan5 (tacho5) 0xe8 27 fan6 (tacho6) 0xe9 28 fan7 (tacho7) 0xea 29 fan8 (tacho8) 0xeb 30 fan9 (tacho9) 0xec 31 fan10 (tacho10) 0xed 32 fan11 (tacho11) 0xee 33 fan12 (tacho12) 0xef 34 ======================= ==== 35 36 This setup can be re-programmed with other registers. 37 38 Description 39 ----------- 40 41 The driver implements a simple interface for driving a fan connected to 42 a PWM output and tachometer inputs. 43 This driver obtains PWM and tachometers registers location according to 44 the system configuration and creates FAN/PWM hwmon objects and a cooling 45 device. PWM and tachometers are sensed through the on-board programmable 46 device, which exports its register map. This device could be attached to 47 any bus type, for which register mapping is supported. 48 Single instance is created with one PWM control, up to 12 tachometers and 49 one cooling device. It could be as many instances as programmable device 50 supports. 51 The driver exposes the fan to the user space through the hwmon's and 52 thermal's sysfs interfaces. 53 54 /sys files in hwmon subsystem 55 ----------------------------- 56 57 ================= == =================================================== 58 fan[1-12]_fault RO files for tachometers TACH1-TACH12 fault indication 59 fan[1-12]_input RO files for tachometers TACH1-TACH12 input (in RPM) 60 pwm1 RW file for fan[1-12] target duty cycle (0..255) 61 ================= == =================================================== 62 63 /sys files in thermal subsystem 64 ------------------------------- 65 66 ================= == ==================================================== 67 cur_state RW file for current cooling state of the cooling device 68 (0..max_state) 69 max_state RO file for maximum cooling state of the cooling device 70 ================= == ====================================================
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