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6
7#include <linux/device.h>
8#include <linux/err.h>
9#include <linux/io.h>
10#include <linux/kernel.h>
11#include <linux/of.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/thermal.h>
15
16#define DOVE_THERMAL_TEMP_OFFSET 1
17#define DOVE_THERMAL_TEMP_MASK 0x1FF
18
19
20#define PMU_TM_DISABLE_OFFS 0
21#define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS)
22
23
24#define PMU_TDC0_SW_RST_MASK (0x1 << 1)
25#define PMU_TDC0_SEL_VCAL_OFFS 5
26#define PMU_TDC0_SEL_VCAL_MASK (0x3 << PMU_TDC0_SEL_VCAL_OFFS)
27#define PMU_TDC0_REF_CAL_CNT_OFFS 11
28#define PMU_TDC0_REF_CAL_CNT_MASK (0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS)
29#define PMU_TDC0_AVG_NUM_OFFS 25
30#define PMU_TDC0_AVG_NUM_MASK (0x7 << PMU_TDC0_AVG_NUM_OFFS)
31
32
33#define PMU_TEMP_DIOD_CTRL1_REG 0x04
34#define PMU_TDC1_TEMP_VALID_MASK (0x1 << 10)
35
36
37struct dove_thermal_priv {
38 void __iomem *sensor;
39 void __iomem *control;
40};
41
42static int dove_init_sensor(const struct dove_thermal_priv *priv)
43{
44 u32 reg;
45 u32 i;
46
47
48 reg = readl_relaxed(priv->control);
49
50
51 reg &= ~PMU_TDC0_AVG_NUM_MASK;
52 reg |= (0x1 << PMU_TDC0_AVG_NUM_OFFS);
53
54
55 reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
56 reg |= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS);
57
58
59 reg &= ~PMU_TDC0_SEL_VCAL_MASK;
60 reg |= (0x2 << PMU_TDC0_SEL_VCAL_OFFS);
61 writel(reg, priv->control);
62
63
64 reg = readl_relaxed(priv->control);
65 writel((reg | PMU_TDC0_SW_RST_MASK), priv->control);
66 writel(reg, priv->control);
67
68
69 reg = readl_relaxed(priv->sensor);
70 reg &= ~PMU_TM_DISABLE_MASK;
71 writel(reg, priv->sensor);
72
73
74 for (i = 0; i < 1000000; i++) {
75 reg = readl_relaxed(priv->sensor);
76 if (reg & DOVE_THERMAL_TEMP_MASK)
77 break;
78 }
79
80 if (i == 1000000)
81 return -EIO;
82
83 return 0;
84}
85
86static int dove_get_temp(struct thermal_zone_device *thermal,
87 int *temp)
88{
89 unsigned long reg;
90 struct dove_thermal_priv *priv = thermal->devdata;
91
92
93 reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG);
94 if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0) {
95 dev_err(&thermal->device,
96 "Temperature sensor reading not valid\n");
97 return -EIO;
98 }
99
100
101
102
103
104
105 reg = readl_relaxed(priv->sensor);
106 reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK;
107 *temp = ((3220000000UL - (10000000UL * reg)) / 13625);
108
109 return 0;
110}
111
112static struct thermal_zone_device_ops ops = {
113 .get_temp = dove_get_temp,
114};
115
116static const struct of_device_id dove_thermal_id_table[] = {
117 { .compatible = "marvell,dove-thermal" },
118 {}
119};
120
121static int dove_thermal_probe(struct platform_device *pdev)
122{
123 struct thermal_zone_device *thermal = NULL;
124 struct dove_thermal_priv *priv;
125 struct resource *res;
126 int ret;
127
128 priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
129 if (!priv)
130 return -ENOMEM;
131
132 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
133 priv->sensor = devm_ioremap_resource(&pdev->dev, res);
134 if (IS_ERR(priv->sensor))
135 return PTR_ERR(priv->sensor);
136
137 res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
138 priv->control = devm_ioremap_resource(&pdev->dev, res);
139 if (IS_ERR(priv->control))
140 return PTR_ERR(priv->control);
141
142 ret = dove_init_sensor(priv);
143 if (ret) {
144 dev_err(&pdev->dev, "Failed to initialize sensor\n");
145 return ret;
146 }
147
148 thermal = thermal_zone_device_register("dove_thermal", 0, 0,
149 priv, &ops, NULL, 0, 0);
150 if (IS_ERR(thermal)) {
151 dev_err(&pdev->dev,
152 "Failed to register thermal zone device\n");
153 return PTR_ERR(thermal);
154 }
155
156 ret = thermal_zone_device_enable(thermal);
157 if (ret) {
158 thermal_zone_device_unregister(thermal);
159 return ret;
160 }
161
162 platform_set_drvdata(pdev, thermal);
163
164 return 0;
165}
166
167static int dove_thermal_exit(struct platform_device *pdev)
168{
169 struct thermal_zone_device *dove_thermal =
170 platform_get_drvdata(pdev);
171
172 thermal_zone_device_unregister(dove_thermal);
173
174 return 0;
175}
176
177MODULE_DEVICE_TABLE(of, dove_thermal_id_table);
178
179static struct platform_driver dove_thermal_driver = {
180 .probe = dove_thermal_probe,
181 .remove = dove_thermal_exit,
182 .driver = {
183 .name = "dove_thermal",
184 .of_match_table = dove_thermal_id_table,
185 },
186};
187
188module_platform_driver(dove_thermal_driver);
189
190MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>");
191MODULE_DESCRIPTION("Dove thermal driver");
192MODULE_LICENSE("GPL");
193
