LXR uboot/board/gdsys/common/fanctrl.c

   1/*
   2 * (C) Copyright 2015
   3 * Dirk Eibach,  Guntermann & Drunck GmbH, eibach@gdsys.de
   4 *
   5 * SPDX-License-Identifier:     GPL-2.0+
   6 */
   7
   8#include <common.h>
   9#include <i2c.h>
  10
  11enum {
  12        FAN_CONFIG = 0x03,
  13        FAN_TACHLIM_LSB = 0x48,
  14        FAN_TACHLIM_MSB = 0x49,
  15        FAN_PWM_FREQ = 0x4D,
  16};
  17
  18void init_fan_controller(u8 addr)
  19{
  20        int val;
  21
  22        /* set PWM Frequency to 2.5% resolution */
  23        i2c_reg_write(addr, FAN_PWM_FREQ, 20);
  24
  25        /* set Tachometer Limit */
  26        i2c_reg_write(addr, FAN_TACHLIM_LSB, 0x10);
  27        i2c_reg_write(addr, FAN_TACHLIM_MSB, 0x0a);
  28
  29        /* enable Tach input */
  30        val = i2c_reg_read(addr, FAN_CONFIG) | 0x04;
  31        i2c_reg_write(addr, FAN_CONFIG, val);
  32}
  33