에프에이리눅스 / 1611_0007_prime_oven

Blame view

bootloader/u-boot_2015_04/drivers/hwmon/lm63.c 2.95 KB
edit raw normal view history
6b13f685e   김민수   BSP 최초 추가 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
 
  /*
   * (C) Copyright 2007-2008
   * Dirk Eibach,  Guntermann & Drunck GmbH, eibach@gdsys.de
   * based on lm75.c by Bill Hunter
   *
   * SPDX-License-Identifier:	GPL-2.0+
   */
  
  /*
   * National LM63/LM64 Temperature Sensor
   * Main difference: LM 64 has -16 Kelvin temperature offset
   */
  
  #include <common.h>
  #include <i2c.h>
  #include <dtt.h>
  
  #define DTT_I2C_LM63_ADDR	0x4C	/* National LM63 device */
  
  #define DTT_READ_TEMP_RMT_MSB	0x01
  #define DTT_CONFIG		0x03
  #define DTT_READ_TEMP_RMT_LSB	0x10
  #define DTT_TACHLIM_LSB		0x48
  #define DTT_TACHLIM_MSB		0x49
  #define DTT_FAN_CONFIG		0x4A
  #define DTT_PWM_FREQ		0x4D
  #define DTT_PWM_LOOKUP_BASE	0x50
  
  struct pwm_lookup_entry {
  	u8 temp;
  	u8 pwm;
  };
  
  /*
   * Device code
   */
  
  int dtt_read(int sensor, int reg)
  {
  	int dlen;
  	uchar data[2];
  
  	/*
  	 * Calculate sensor address and register.
  	 */
  	if (!sensor)
  		sensor = DTT_I2C_LM63_ADDR;	/* legacy config */
  
  	dlen = 1;
  
  	/*
  	 * Now try to read the register.
  	 */
  	if (i2c_read(sensor, reg, 1, data, dlen) != 0)
  		return -1;
  
  	return (int)data[0];
  }				/* dtt_read() */
  
  int dtt_write(int sensor, int reg, int val)
  {
  	int dlen;
  	uchar data[2];
  
  	/*
  	 * Calculate sensor address and register.
  	 */
  	if (!sensor)
  		sensor = DTT_I2C_LM63_ADDR;	/* legacy config */
  
  	dlen = 1;
  	data[0] = (char)(val & 0xff);
  
  	/*
  	 * Write value to register.
  	 */
  	if (i2c_write(sensor, reg, 1, data, dlen) != 0)
  		return 1;
  
  	return 0;
  }				/* dtt_write() */
  
  static int is_lm64(int sensor)
  {
  	return sensor && (sensor != DTT_I2C_LM63_ADDR);
  }
  
  int dtt_init_one(int sensor)
  {
  	int i;
  	int val;
  
  	struct pwm_lookup_entry pwm_lookup[] = CONFIG_DTT_PWM_LOOKUPTABLE;
  
  	/*
  	 * Set PWM Frequency to 2.5% resolution
  	 */
  	val = 20;
  	if (dtt_write(sensor, DTT_PWM_FREQ, val) != 0)
  		return 1;
  
  	/*
  	 * Set Tachometer Limit
  	 */
  	val = CONFIG_DTT_TACH_LIMIT;
  	if (dtt_write(sensor, DTT_TACHLIM_LSB, val & 0xff) != 0)
  		return 1;
  	if (dtt_write(sensor, DTT_TACHLIM_MSB, (val >> 8) & 0xff) != 0)
  		return 1;
  
  	/*
  	 * Make sure PWM Lookup-Table is writeable
  	 */
  	if (dtt_write(sensor, DTT_FAN_CONFIG, 0x20) != 0)
  		return 1;
  
  	/*
  	 * Setup PWM Lookup-Table
  	 */
  	for (i = 0; i < ARRAY_SIZE(pwm_lookup); i++) {
  		int address = DTT_PWM_LOOKUP_BASE + 2 * i;
  		val = pwm_lookup[i].temp;
  		if (is_lm64(sensor))
  			val -= 16;
  		if (dtt_write(sensor, address, val) != 0)
  			return 1;
  		val = dtt_read(sensor, address);
  		val = pwm_lookup[i].pwm;
  		if (dtt_write(sensor, address + 1, val) != 0)
  			return 1;
  	}
  
  	/*
  	 * Enable PWM Lookup-Table, PWM Clock 360 kHz, Tachometer Mode 2
  	 */
  	val = 0x02;
  	if (dtt_write(sensor, DTT_FAN_CONFIG, val) != 0)
  		return 1;
  
  	/*
  	 * Enable Tach input
  	 */
  	val = dtt_read(sensor, DTT_CONFIG) | 0x04;
  	if (dtt_write(sensor, DTT_CONFIG, val) != 0)
  		return 1;
  
  	return 0;
  }
  
  int dtt_get_temp(int sensor)
  {
  	s16 temp = (dtt_read(sensor, DTT_READ_TEMP_RMT_MSB) << 8)
  	    | (dtt_read(sensor, DTT_READ_TEMP_RMT_LSB));
  
  	if (is_lm64(sensor))
  		temp += 16 << 8;
  
  	/* Ignore LSB for now, U-Boot only prints natural numbers */
  	return temp >> 8;
  }