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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/*
* Dove thermal sensor driver
*
* Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch>
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* 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.
*
*/
#include <linux/device.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/thermal.h>
#define DOVE_THERMAL_TEMP_OFFSET 1
#define DOVE_THERMAL_TEMP_MASK 0x1FF
/* Dove Thermal Manager Control and Status Register */
#define PMU_TM_DISABLE_OFFS 0
#define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
/* Dove Theraml Diode Control 0 Register */
#define PMU_TDC0_SW_RST_MASK (0x1 << 1)
#define PMU_TDC0_SEL_VCAL_OFFS 5
#define PMU_TDC0_SEL_VCAL_MASK (0x3 << PMU_TDC0_SEL_VCAL_OFFS)
#define PMU_TDC0_REF_CAL_CNT_OFFS 11
#define PMU_TDC0_REF_CAL_CNT_MASK (0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS)
#define PMU_TDC0_AVG_NUM_OFFS 25
#define PMU_TDC0_AVG_NUM_MASK (0x7 << PMU_TDC0_AVG_NUM_OFFS)
/* Dove Thermal Diode Control 1 Register */
#define PMU_TEMP_DIOD_CTRL1_REG 0x04
#define PMU_TDC1_TEMP_VALID_MASK (0x1 << 10)
/* Dove Thermal Sensor Dev Structure */
struct dove_thermal_priv {
void __iomem *sensor;
void __iomem *control;
};
static int dove_init_sensor(const struct dove_thermal_priv *priv)
{
u32 reg;
u32 i;
/* Configure the Diode Control Register #0 */
reg = readl_relaxed(priv->control);
/* Use average of 2 */
reg &= ~PMU_TDC0_AVG_NUM_MASK;
reg |= (0x1 << PMU_TDC0_AVG_NUM_OFFS);
/* Reference calibration value */
reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
reg |= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS);
/* Set the high level reference for calibration */
reg &= ~PMU_TDC0_SEL_VCAL_MASK;
reg |= (0x2 << PMU_TDC0_SEL_VCAL_OFFS);
writel(reg, priv->control);
/* Reset the sensor */
reg = readl_relaxed(priv->control);
writel((reg | PMU_TDC0_SW_RST_MASK), priv->control);
writel(reg, priv->control);
/* Enable the sensor */
reg = readl_relaxed(priv->sensor);
reg &= ~PMU_TM_DISABLE_MASK;
writel(reg, priv->sensor);
/* Poll the sensor for the first reading */
for (i = 0; i < 1000000; i++) {
reg = readl_relaxed(priv->sensor);
if (reg & DOVE_THERMAL_TEMP_MASK)
break;
}
if (i == 1000000)
return -EIO;
return 0;
}
static int dove_get_temp(struct thermal_zone_device *thermal,
unsigned long *temp)
{
unsigned long reg;
struct dove_thermal_priv *priv = thermal->devdata;
/* Valid check */
reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG);
if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0) {
dev_err(&thermal->device,
"Temperature sensor reading not valid\n");
return -EIO;
}
/*
* Calculate temperature. According to Marvell internal
* documentation the formula for this is:
* Celsius = (322-reg)/1.3625
*/
reg = readl_relaxed(priv->sensor);
reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK;
*temp = ((3220000000UL - (10000000UL * reg)) / 13625);
return 0;
}
static struct thermal_zone_device_ops ops = {
.get_temp = dove_get_temp,
};
static const struct of_device_id dove_thermal_id_table[] = {
{ .compatible = "marvell,dove-thermal" },
{}
};
static int dove_thermal_probe(struct platform_device *pdev)
{
struct thermal_zone_device *thermal = NULL;
struct dove_thermal_priv *priv;
struct resource *res;
int ret;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
dev_err(&pdev->dev, "Failed to get platform resource\n");
return -ENODEV;
}
priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->sensor = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->sensor))
return PTR_ERR(priv->sensor);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
if (!res) {
dev_err(&pdev->dev, "Failed to get platform resource\n");
return -ENODEV;
}
priv->control = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(priv->control))
return PTR_ERR(priv->control);
ret = dove_init_sensor(priv);
if (ret) {
dev_err(&pdev->dev, "Failed to initialize sensor\n");
return ret;
}
thermal = thermal_zone_device_register("dove_thermal", 0, 0,
priv, &ops, NULL, 0, 0);
if (IS_ERR(thermal)) {
dev_err(&pdev->dev,
"Failed to register thermal zone device\n");
return PTR_ERR(thermal);
}
platform_set_drvdata(pdev, thermal);
return 0;
}
static int dove_thermal_exit(struct platform_device *pdev)
{
struct thermal_zone_device *dove_thermal =
platform_get_drvdata(pdev);
thermal_zone_device_unregister(dove_thermal);
return 0;
}
MODULE_DEVICE_TABLE(of, dove_thermal_id_table);
static struct platform_driver dove_thermal_driver = {
.probe = dove_thermal_probe,
.remove = dove_thermal_exit,
.driver = {
.name = "dove_thermal",
.owner = THIS_MODULE,
.of_match_table = of_match_ptr(dove_thermal_id_table),
},
};
module_platform_driver(dove_thermal_driver);
MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
MODULE_DESCRIPTION("Dove thermal driver");
MODULE_LICENSE("GPL");
|
