1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * (C) Copyright 2015
4 * Dirk Eibach, Guntermann & Drunck GmbH, dirk.eibach@gdsys.cc
5 */
6
7 #include <common.h>
8 #include <i2c.h>
9
10 enum {
11 FAN_CONFIG = 0x03,
12 FAN_TACHLIM_LSB = 0x48,
13 FAN_TACHLIM_MSB = 0x49,
14 FAN_PWM_FREQ = 0x4D,
15 };
16
init_fan_controller(u8 addr)17 void init_fan_controller(u8 addr)
18 {
19 int val;
20
21 /* set PWM Frequency to 2.5% resolution */
22 i2c_reg_write(addr, FAN_PWM_FREQ, 20);
23
24 /* set Tachometer Limit */
25 i2c_reg_write(addr, FAN_TACHLIM_LSB, 0x10);
26 i2c_reg_write(addr, FAN_TACHLIM_MSB, 0x0a);
27
28 /* enable Tach input */
29 val = i2c_reg_read(addr, FAN_CONFIG) | 0x04;
30 i2c_reg_write(addr, FAN_CONFIG, val);
31 }
32