1 /*
2 * (C) Copyright 2007-2008
3 * Dirk Eibach, Guntermann & Drunck GmbH, eibach@gdsys.de
4 * based on lm75.c by Bill Hunter
5 *
6 * See file CREDITS for list of people who contributed to this
7 * project.
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
22 * MA 02111-1307 USA
23 */
24
25 /*
26 * National LM63 Temperature Sensor
27 */
28
29 #include <common.h>
30 #include <i2c.h>
31 #include <dtt.h>
32
33 #define DTT_I2C_DEV_CODE 0x4C /* National LM63 device */
34
35 #define DTT_READ_TEMP_RMT_MSB 0x01
36 #define DTT_CONFIG 0x03
37 #define DTT_READ_TEMP_RMT_LSB 0x10
38 #define DTT_TACHLIM_LSB 0x48
39 #define DTT_TACHLIM_MSB 0x49
40 #define DTT_FAN_CONFIG 0x4A
41 #define DTT_PWM_FREQ 0x4D
42 #define DTT_PWM_LOOKUP_BASE 0x50
43
44 struct pwm_lookup_entry {
45 u8 temp;
46 u8 pwm;
47 };
48
49 /*
50 * Device code
51 */
52
dtt_read(int sensor,int reg)53 int dtt_read(int sensor, int reg)
54 {
55 int dlen;
56 uchar data[2];
57
58 /*
59 * Calculate sensor address and register.
60 */
61 sensor = DTT_I2C_DEV_CODE; /* address of lm63 is not adjustable */
62
63 dlen = 1;
64
65 /*
66 * Now try to read the register.
67 */
68 if (i2c_read(sensor, reg, 1, data, dlen) != 0)
69 return -1;
70
71 return (int)data[0];
72 } /* dtt_read() */
73
dtt_write(int sensor,int reg,int val)74 int dtt_write(int sensor, int reg, int val)
75 {
76 int dlen;
77 uchar data[2];
78
79 /*
80 * Calculate sensor address and register.
81 */
82 sensor = DTT_I2C_DEV_CODE; /* address of lm63 is not adjustable */
83
84 dlen = 1;
85 data[0] = (char)(val & 0xff);
86
87 /*
88 * Write value to register.
89 */
90 if (i2c_write(sensor, reg, 1, data, dlen) != 0)
91 return 1;
92
93 return 0;
94 } /* dtt_write() */
95
_dtt_init(int sensor)96 static int _dtt_init(int sensor)
97 {
98 int i;
99 int val;
100
101 struct pwm_lookup_entry pwm_lookup[] = CONFIG_DTT_PWM_LOOKUPTABLE;
102
103 /*
104 * Set PWM Frequency to 2.5% resolution
105 */
106 val = 20;
107 if (dtt_write(sensor, DTT_PWM_FREQ, val) != 0)
108 return 1;
109
110 /*
111 * Set Tachometer Limit
112 */
113 val = CONFIG_DTT_TACH_LIMIT;
114 if (dtt_write(sensor, DTT_TACHLIM_LSB, val & 0xff) != 0)
115 return 1;
116 if (dtt_write(sensor, DTT_TACHLIM_MSB, (val >> 8) & 0xff) != 0)
117 return 1;
118
119 /*
120 * Setup PWM Lookup-Table
121 */
122 for (i = 0; i < sizeof(pwm_lookup) / sizeof(struct pwm_lookup_entry);
123 i++) {
124 int address = DTT_PWM_LOOKUP_BASE + 2 * i;
125 val = pwm_lookup[i].temp;
126 if (dtt_write(sensor, address, val) != 0)
127 return 1;
128 val = pwm_lookup[i].pwm;
129 if (dtt_write(sensor, address + 1, val) != 0)
130 return 1;
131 }
132
133 /*
134 * Enable PWM Lookup-Table, PWM Clock 360 kHz, Tachometer Mode 2
135 */
136 val = 0x02;
137 if (dtt_write(sensor, DTT_FAN_CONFIG, val) != 0)
138 return 1;
139
140 /*
141 * Enable Tach input
142 */
143 val = dtt_read(sensor, DTT_CONFIG) | 0x04;
144 if (dtt_write(sensor, DTT_CONFIG, val) != 0)
145 return 1;
146
147 return 0;
148 }
149
dtt_get_temp(int sensor)150 int dtt_get_temp(int sensor)
151 {
152 s16 temp = (dtt_read(sensor, DTT_READ_TEMP_RMT_MSB) << 8)
153 | (dtt_read(sensor, DTT_READ_TEMP_RMT_LSB));
154
155 /* Ignore LSB for now, U-Boot only prints natural numbers */
156 return temp >> 8;
157 }
158
dtt_init(void)159 int dtt_init(void)
160 {
161 int i;
162 unsigned char sensors[] = CONFIG_DTT_SENSORS;
163 const char *const header = "DTT: ";
164
165 for (i = 0; i < sizeof(sensors); i++) {
166 if (_dtt_init(sensors[i]) != 0)
167 printf("%s%d FAILED INIT\n", header, i + 1);
168 else
169 printf("%s%d is %i C\n", header, i + 1,
170 dtt_get_temp(sensors[i]));
171 }
172
173 return 0;
174 }
175