Root/
1 | /* |
2 | * Dove thermal sensor driver |
3 | * |
4 | * Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch> |
5 | * |
6 | * This software is licensed under the terms of the GNU General Public |
7 | * License version 2, as published by the Free Software Foundation, and |
8 | * may be copied, distributed, and modified under those terms. |
9 | * |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | * GNU General Public License for more details. |
14 | * |
15 | */ |
16 | #include <linux/device.h> |
17 | #include <linux/err.h> |
18 | #include <linux/io.h> |
19 | #include <linux/kernel.h> |
20 | #include <linux/of.h> |
21 | #include <linux/module.h> |
22 | #include <linux/platform_device.h> |
23 | #include <linux/thermal.h> |
24 | |
25 | #define DOVE_THERMAL_TEMP_OFFSET 1 |
26 | #define DOVE_THERMAL_TEMP_MASK 0x1FF |
27 | |
28 | /* Dove Thermal Manager Control and Status Register */ |
29 | #define PMU_TM_DISABLE_OFFS 0 |
30 | #define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS) |
31 | |
32 | /* Dove Theraml Diode Control 0 Register */ |
33 | #define PMU_TDC0_SW_RST_MASK (0x1 << 1) |
34 | #define PMU_TDC0_SEL_VCAL_OFFS 5 |
35 | #define PMU_TDC0_SEL_VCAL_MASK (0x3 << PMU_TDC0_SEL_VCAL_OFFS) |
36 | #define PMU_TDC0_REF_CAL_CNT_OFFS 11 |
37 | #define PMU_TDC0_REF_CAL_CNT_MASK (0x1FF << PMU_TDC0_REF_CAL_CNT_OFFS) |
38 | #define PMU_TDC0_AVG_NUM_OFFS 25 |
39 | #define PMU_TDC0_AVG_NUM_MASK (0x7 << PMU_TDC0_AVG_NUM_OFFS) |
40 | |
41 | /* Dove Thermal Diode Control 1 Register */ |
42 | #define PMU_TEMP_DIOD_CTRL1_REG 0x04 |
43 | #define PMU_TDC1_TEMP_VALID_MASK (0x1 << 10) |
44 | |
45 | /* Dove Thermal Sensor Dev Structure */ |
46 | struct dove_thermal_priv { |
47 | void __iomem *sensor; |
48 | void __iomem *control; |
49 | }; |
50 | |
51 | static int dove_init_sensor(const struct dove_thermal_priv *priv) |
52 | { |
53 | u32 reg; |
54 | u32 i; |
55 | |
56 | /* Configure the Diode Control Register #0 */ |
57 | reg = readl_relaxed(priv->control); |
58 | |
59 | /* Use average of 2 */ |
60 | reg &= ~PMU_TDC0_AVG_NUM_MASK; |
61 | reg |= (0x1 << PMU_TDC0_AVG_NUM_OFFS); |
62 | |
63 | /* Reference calibration value */ |
64 | reg &= ~PMU_TDC0_REF_CAL_CNT_MASK; |
65 | reg |= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS); |
66 | |
67 | /* Set the high level reference for calibration */ |
68 | reg &= ~PMU_TDC0_SEL_VCAL_MASK; |
69 | reg |= (0x2 << PMU_TDC0_SEL_VCAL_OFFS); |
70 | writel(reg, priv->control); |
71 | |
72 | /* Reset the sensor */ |
73 | reg = readl_relaxed(priv->control); |
74 | writel((reg | PMU_TDC0_SW_RST_MASK), priv->control); |
75 | writel(reg, priv->control); |
76 | |
77 | /* Enable the sensor */ |
78 | reg = readl_relaxed(priv->sensor); |
79 | reg &= ~PMU_TM_DISABLE_MASK; |
80 | writel(reg, priv->sensor); |
81 | |
82 | /* Poll the sensor for the first reading */ |
83 | for (i = 0; i < 1000000; i++) { |
84 | reg = readl_relaxed(priv->sensor); |
85 | if (reg & DOVE_THERMAL_TEMP_MASK) |
86 | break; |
87 | } |
88 | |
89 | if (i == 1000000) |
90 | return -EIO; |
91 | |
92 | return 0; |
93 | } |
94 | |
95 | static int dove_get_temp(struct thermal_zone_device *thermal, |
96 | unsigned long *temp) |
97 | { |
98 | unsigned long reg; |
99 | struct dove_thermal_priv *priv = thermal->devdata; |
100 | |
101 | /* Valid check */ |
102 | reg = readl_relaxed(priv->control + PMU_TEMP_DIOD_CTRL1_REG); |
103 | if ((reg & PMU_TDC1_TEMP_VALID_MASK) == 0x0) { |
104 | dev_err(&thermal->device, |
105 | "Temperature sensor reading not valid\n"); |
106 | return -EIO; |
107 | } |
108 | |
109 | /* |
110 | * Calculate temperature. According to Marvell internal |
111 | * documentation the formula for this is: |
112 | * Celsius = (322-reg)/1.3625 |
113 | */ |
114 | reg = readl_relaxed(priv->sensor); |
115 | reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK; |
116 | *temp = ((3220000000UL - (10000000UL * reg)) / 13625); |
117 | |
118 | return 0; |
119 | } |
120 | |
121 | static struct thermal_zone_device_ops ops = { |
122 | .get_temp = dove_get_temp, |
123 | }; |
124 | |
125 | static const struct of_device_id dove_thermal_id_table[] = { |
126 | { .compatible = "marvell,dove-thermal" }, |
127 | {} |
128 | }; |
129 | |
130 | static int dove_thermal_probe(struct platform_device *pdev) |
131 | { |
132 | struct thermal_zone_device *thermal = NULL; |
133 | struct dove_thermal_priv *priv; |
134 | struct resource *res; |
135 | int ret; |
136 | |
137 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
138 | if (!priv) |
139 | return -ENOMEM; |
140 | |
141 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
142 | priv->sensor = devm_ioremap_resource(&pdev->dev, res); |
143 | if (IS_ERR(priv->sensor)) |
144 | return PTR_ERR(priv->sensor); |
145 | |
146 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
147 | priv->control = devm_ioremap_resource(&pdev->dev, res); |
148 | if (IS_ERR(priv->control)) |
149 | return PTR_ERR(priv->control); |
150 | |
151 | ret = dove_init_sensor(priv); |
152 | if (ret) { |
153 | dev_err(&pdev->dev, "Failed to initialize sensor\n"); |
154 | return ret; |
155 | } |
156 | |
157 | thermal = thermal_zone_device_register("dove_thermal", 0, 0, |
158 | priv, &ops, NULL, 0, 0); |
159 | if (IS_ERR(thermal)) { |
160 | dev_err(&pdev->dev, |
161 | "Failed to register thermal zone device\n"); |
162 | return PTR_ERR(thermal); |
163 | } |
164 | |
165 | platform_set_drvdata(pdev, thermal); |
166 | |
167 | return 0; |
168 | } |
169 | |
170 | static int dove_thermal_exit(struct platform_device *pdev) |
171 | { |
172 | struct thermal_zone_device *dove_thermal = |
173 | platform_get_drvdata(pdev); |
174 | |
175 | thermal_zone_device_unregister(dove_thermal); |
176 | |
177 | return 0; |
178 | } |
179 | |
180 | MODULE_DEVICE_TABLE(of, dove_thermal_id_table); |
181 | |
182 | static struct platform_driver dove_thermal_driver = { |
183 | .probe = dove_thermal_probe, |
184 | .remove = dove_thermal_exit, |
185 | .driver = { |
186 | .name = "dove_thermal", |
187 | .owner = THIS_MODULE, |
188 | .of_match_table = dove_thermal_id_table, |
189 | }, |
190 | }; |
191 | |
192 | module_platform_driver(dove_thermal_driver); |
193 | |
194 | MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>"); |
195 | MODULE_DESCRIPTION("Dove thermal driver"); |
196 | MODULE_LICENSE("GPL"); |
197 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9