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/* This file is part of the coreboot project. */
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <device/device.h>
#include <console/console.h>
#include <device/smbus.h>
/**
* Do some S2881-specific HWM initialization for the ADT7463 chip.
*
* Should be factored out so that it can be more general.
*
* See Analog Devices ADT7463 datasheet, Rev C (2004):
* http://www.analog.com/en/prod/0,,766_825_ADT7463,00.html
*/
static void adt7463_init(struct device *adt7463)
{
int result;
printk(BIOS_DEBUG, "ADT7463 is %s\n", dev_path(adt7463));
/* Set all fans to 'Fastest Speed Calculated by All 3 Temperature
* Channels Controls PWMx'.
*/
result = smbus_write_byte(adt7463, 0x5c, 0xc2);
result = smbus_write_byte(adt7463, 0x5d, 0xc2);
result = smbus_write_byte(adt7463, 0x5e, 0xc2);
/* Make sure that our fans never stop when temp. falls below Tmin,
* but rather keep going at minimum duty cycle (applies to automatic
* fan control mode only).
*/
result = smbus_write_byte(adt7463, 0x62, 0xc0);
/* Set minimum PWM duty cycle to 25%, rather than the default 50%. */
result = smbus_write_byte(adt7463, 0x64, 0x40);
result = smbus_write_byte(adt7463, 0x65, 0x40);
result = smbus_write_byte(adt7463, 0x66, 0x40);
/* Set Tmin to 55C, rather than the default 90C. Above this temperature
* the fans will start blowing harder as temperature increases
* (automatic mode only).
*/
result = smbus_write_byte(adt7463, 0x67, 0x37);
result = smbus_write_byte(adt7463, 0x68, 0x37);
result = smbus_write_byte(adt7463, 0x69, 0x37);
/* Set THERM limit to 70C, rather than the default 100C.
* The fans will kick in at 100% if the sensors reach this temperature,
* (only in automatic mode, but supposedly even when hardware is
* locked up). This is a failsafe measure.
*/
result = smbus_write_byte(adt7463, 0x6a, 0x46);
result = smbus_write_byte(adt7463, 0x6b, 0x46);
result = smbus_write_byte(adt7463, 0x6c, 0x46);
/* Remote temperature 1 offset (LSB == 0.25C). */
result = smbus_write_byte(adt7463, 0x70, 0x02);
/* Remote temperature 2 offset (LSB == 0.25C). */
result = smbus_write_byte(adt7463, 0x72, 0x01);
/* Set TACH measurements to normal (1/second). */
result = smbus_write_byte(adt7463, 0x78, 0xf0);
printk(BIOS_DEBUG, "ADT7463 properly initialized\n");
}
static struct device_operations adt7463_operations = {
.read_resources = noop_read_resources,
.set_resources = noop_set_resources,
.init = adt7463_init,
};
static void enable_dev(struct device *dev)
{
dev->ops = &adt7463_operations;
}
struct chip_operations drivers_i2c_adt7463_ops = {
CHIP_NAME("adt7463")
.enable_dev = enable_dev,
};
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