2 * This file is part of the coreboot project.
4 * Copyright (C) 2005 Tyan
5 * (Written by Yinghai Lu <yhlu@tyan.com> for Tyan)
6 * Copyright (C) 2007 Ward Vandewege <ward@gnu.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 #include <device/device.h>
24 #include <console/console.h>
25 #include <device/smbus.h>
29 * Do some S2881-specific HWM initialization for the ADT7463 chip.
31 * See Analog Devices ADT7463 datasheet, Rev C (2004):
32 * http://www.analog.com/en/prod/0,,766_825_ADT7463,00.html
34 static void adt7463_init(device_t dev)
36 device_t smbus_dev, adt7463;
37 struct device_path path;
40 /* Find the SMBus controller (AMD-8111). */
41 smbus_dev = dev_find_device(0x1022, 0x746b, 0);
43 die("SMBus controller not found\n");
44 printk(BIOS_DEBUG, "SMBus controller found\n");
46 /* Find the ADT7463 device. */
47 path.type = DEVICE_PATH_I2C;
48 path.i2c.device = 0x2d;
49 adt7463 = find_dev_path(smbus_dev->link, &path);
51 die("ADT7463 not found\n");
52 printk(BIOS_DEBUG, "ADT7463 found\n");
54 /* Set all fans to 'Fastest Speed Calculated by All 3 Temperature
55 * Channels Controls PWMx'.
57 result = smbus_write_byte(adt7463, 0x5c, 0xc2);
58 result = smbus_write_byte(adt7463, 0x5d, 0xc2);
59 result = smbus_write_byte(adt7463, 0x5e, 0xc2);
61 /* Make sure that our fans never stop when temp. falls below Tmin,
62 * but rather keep going at minimum duty cycle (applies to automatic
63 * fan control mode only).
65 result = smbus_write_byte(adt7463, 0x62, 0xc0);
67 /* Set minimum PWM duty cycle to 25%, rather than the default 50%. */
68 result = smbus_write_byte(adt7463, 0x64, 0x40);
69 result = smbus_write_byte(adt7463, 0x65, 0x40);
70 result = smbus_write_byte(adt7463, 0x66, 0x40);
72 /* Set Tmin to 55C, rather than the default 90C. Above this temperature
73 * the fans will start blowing harder as temperature increases
74 * (automatic mode only).
76 result = smbus_write_byte(adt7463, 0x67, 0x37);
77 result = smbus_write_byte(adt7463, 0x68, 0x37);
78 result = smbus_write_byte(adt7463, 0x69, 0x37);
80 /* Set THERM limit to 70C, rather than the default 100C.
81 * The fans will kick in at 100% if the sensors reach this temperature,
82 * (only in automatic mode, but supposedly even when hardware is
83 * locked up). This is a failsafe measure.
85 result = smbus_write_byte(adt7463, 0x6a, 0x46);
86 result = smbus_write_byte(adt7463, 0x6b, 0x46);
87 result = smbus_write_byte(adt7463, 0x6c, 0x46);
89 /* Remote temperature 1 offset (LSB == 0.25C). */
90 result = smbus_write_byte(adt7463, 0x70, 0x02);
92 /* Remote temperature 2 offset (LSB == 0.25C). */
93 result = smbus_write_byte(adt7463, 0x72, 0x01);
95 /* Set TACH measurements to normal (1/second). */
96 result = smbus_write_byte(adt7463, 0x78, 0xf0);
98 printk(BIOS_DEBUG, "ADT7463 properly initialized\n");
101 static void dummy_noop(device_t dummy)
105 static struct device_operations dummy_operations = {
106 .read_resources = dummy_noop,
107 .set_resources = dummy_noop,
108 .enable_resources = dummy_noop,
109 .init = adt7463_init,
112 static unsigned int scan_root_bus(device_t root, unsigned int max)
114 struct device_path path;
118 max = root_dev_scan_bus(root, max);
120 printk(BIOS_DEBUG, "scan_root_bus ok\n");
122 /* The following is a little silly. We need a hook into the boot
123 * process *after* the ADT7463 device has been initialized. So we
124 * create this dummy device, and we put the ADT7463 S2881 specific
125 * settings in its init function, which gets called
126 * as the last device to be initialized.
129 link_i = root->links;
130 if (link_i >= MAX_LINKS) {
131 printk(BIOS_DEBUG, "Reached MAX_LINKS, not configuring ADT7463");
134 root->link[link_i].link = link_i;
135 root->link[link_i].dev = root;
136 root->link[link_i].children = 0;
139 path.type = DEVICE_PATH_PNP;
142 dummy = alloc_dev(&root->link[link_i], &path);
143 dummy->ops = &dummy_operations;
148 static struct device_operations mainboard_operations = {
149 .read_resources = root_dev_read_resources,
150 .set_resources = root_dev_set_resources,
151 .enable_resources = root_dev_enable_resources,
152 .init = root_dev_init,
153 .scan_bus = scan_root_bus,
156 static void enable_dev(struct device *dev)
158 dev->ops = &mainboard_operations;
161 struct chip_operations mainboard_ops = {
162 CHIP_NAME("Tyan S2881 Mainboard")
163 .enable_dev = enable_dev,