u-boot/board/gdsys/common/fanctrl.c
Dirk Eibach 5c3b6dc1fb hrcon: Add fan controllers
Signed-off-by: Dirk Eibach <dirk.eibach@gdsys.cc>
2015-11-12 18:04:10 -05:00

32 lines
633 B
C

/*
* (C) Copyright 2015
* Dirk Eibach, Guntermann & Drunck GmbH, eibach@gdsys.de
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <i2c.h>
enum {
FAN_CONFIG = 0x03,
FAN_TACHLIM_LSB = 0x48,
FAN_TACHLIM_MSB = 0x49,
FAN_PWM_FREQ = 0x4D,
};
void init_fan_controller(u8 addr)
{
int val;
/* set PWM Frequency to 2.5% resolution */
i2c_reg_write(addr, FAN_PWM_FREQ, 20);
/* set Tachometer Limit */
i2c_reg_write(addr, FAN_TACHLIM_LSB, 0x10);
i2c_reg_write(addr, FAN_TACHLIM_MSB, 0x0a);
/* enable Tach input */
val = i2c_reg_read(addr, FAN_CONFIG) | 0x04;
i2c_reg_write(addr, FAN_CONFIG, val);
}