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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2005 Tyan
* (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
* Copyright (C) 2007 Ward Vandewege <ward@gnu.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <device/device.h>
#include <console/console.h>
#include <device/smbus.h>
#include "chip.h"
/**
* Do some S2881-specific HWM initialization for the ADT7463 chip.
*
* See Analog Devices ADT7463 datasheet, Rev C (2004):
* http://www.analog.com/en/prod/0,,766_825_ADT7463,00.html
*/
static void adt7463_init(device_t dev)
{
device_t smbus_dev, adt7463;
struct device_path path;
int result;
/* Find the SMBus controller (AMD-8111). */
smbus_dev = dev_find_device(0x1022, 0x746b, 0);
if (!smbus_dev)
die("SMBus controller not found\n");
printk(BIOS_DEBUG, "SMBus controller found\n");
/* Find the ADT7463 device. */
path.type = DEVICE_PATH_I2C;
path.i2c.device = 0x2d;
adt7463 = find_dev_path(smbus_dev->link, &path);
if (!adt7463)
die("ADT7463 not found\n");
printk(BIOS_DEBUG, "ADT7463 found\n");
/* 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 void dummy_noop(device_t dummy)
{
}
static struct device_operations dummy_operations = {
.read_resources = dummy_noop,
.set_resources = dummy_noop,
.enable_resources = dummy_noop,
.init = adt7463_init,
};
static unsigned int scan_root_bus(device_t root, unsigned int max)
{
struct device_path path;
device_t dummy;
unsigned link_i;
max = root_dev_scan_bus(root, max);
printk(BIOS_DEBUG, "scan_root_bus ok\n");
/* The following is a little silly. We need a hook into the boot
* process *after* the ADT7463 device has been initialized. So we
* create this dummy device, and we put the ADT7463 S2881 specific
* settings in its init function, which gets called
* as the last device to be initialized.
*/
link_i = root->links;
if (link_i >= MAX_LINKS) {
printk(BIOS_DEBUG, "Reached MAX_LINKS, not configuring ADT7463");
return max;
}
root->link[link_i].link = link_i;
root->link[link_i].dev = root;
root->link[link_i].children = 0;
root->links++;
path.type = DEVICE_PATH_PNP;
path.pnp.port = 0;
path.pnp.device = 0;
dummy = alloc_dev(&root->link[link_i], &path);
dummy->ops = &dummy_operations;
return max;
}
static struct device_operations mainboard_operations = {
.read_resources = root_dev_read_resources,
.set_resources = root_dev_set_resources,
.enable_resources = root_dev_enable_resources,
.init = root_dev_init,
.scan_bus = scan_root_bus,
};
static void enable_dev(struct device *dev)
{
dev->ops = &mainboard_operations;
}
struct chip_operations mainboard_ops = {
CHIP_NAME("Tyan S2881 Mainboard")
.enable_dev = enable_dev,
};
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