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9c92ab61 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
74ffa64c AL |
2 | /* |
3 | * Dove thermal sensor driver | |
4 | * | |
5 | * Copyright (C) 2013 Andrew Lunn <andrew@lunn.ch> | |
74ffa64c AL |
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 | /* Dove Thermal Manager Control and Status Register */ | |
20 | #define PMU_TM_DISABLE_OFFS 0 | |
21 | #define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_OFFS) | |
22 | ||
23 | /* Dove Theraml Diode Control 0 Register */ | |
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 | /* Dove Thermal Diode Control 1 Register */ | |
33 | #define PMU_TEMP_DIOD_CTRL1_REG 0x04 | |
34 | #define PMU_TDC1_TEMP_VALID_MASK (0x1 << 10) | |
35 | ||
36 | /* Dove Thermal Sensor Dev Structure */ | |
37 | struct dove_thermal_priv { | |
38 | void __iomem *sensor; | |
39 | void __iomem *control; | |
40 | }; | |
41 | ||
42 | static int dove_init_sensor(const struct dove_thermal_priv *priv) | |
43 | { | |
44 | u32 reg; | |
45 | u32 i; | |
46 | ||
47 | /* Configure the Diode Control Register #0 */ | |
48 | reg = readl_relaxed(priv->control); | |
49 | ||
50 | /* Use average of 2 */ | |
51 | reg &= ~PMU_TDC0_AVG_NUM_MASK; | |
52 | reg |= (0x1 << PMU_TDC0_AVG_NUM_OFFS); | |
53 | ||
54 | /* Reference calibration value */ | |
55 | reg &= ~PMU_TDC0_REF_CAL_CNT_MASK; | |
56 | reg |= (0x0F1 << PMU_TDC0_REF_CAL_CNT_OFFS); | |
57 | ||
58 | /* Set the high level reference for calibration */ | |
59 | reg &= ~PMU_TDC0_SEL_VCAL_MASK; | |
60 | reg |= (0x2 << PMU_TDC0_SEL_VCAL_OFFS); | |
61 | writel(reg, priv->control); | |
62 | ||
63 | /* Reset the sensor */ | |
64 | reg = readl_relaxed(priv->control); | |
65 | writel((reg | PMU_TDC0_SW_RST_MASK), priv->control); | |
66 | writel(reg, priv->control); | |
67 | ||
68 | /* Enable the sensor */ | |
69 | reg = readl_relaxed(priv->sensor); | |
70 | reg &= ~PMU_TM_DISABLE_MASK; | |
71 | writel(reg, priv->sensor); | |
72 | ||
73 | /* Poll the sensor for the first reading */ | |
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 | ||
86 | static int dove_get_temp(struct thermal_zone_device *thermal, | |
17e8351a | 87 | int *temp) |
74ffa64c AL |
88 | { |
89 | unsigned long reg; | |
90 | struct dove_thermal_priv *priv = thermal->devdata; | |
91 | ||
92 | /* Valid check */ | |
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 | /* | |
2fd1db88 EG |
101 | * Calculate temperature. According to Marvell internal |
102 | * documentation the formula for this is: | |
103 | * Celsius = (322-reg)/1.3625 | |
74ffa64c AL |
104 | */ |
105 | reg = readl_relaxed(priv->sensor); | |
106 | reg = (reg >> DOVE_THERMAL_TEMP_OFFSET) & DOVE_THERMAL_TEMP_MASK; | |
2fd1db88 | 107 | *temp = ((3220000000UL - (10000000UL * reg)) / 13625); |
74ffa64c AL |
108 | |
109 | return 0; | |
110 | } | |
111 | ||
112 | static struct thermal_zone_device_ops ops = { | |
113 | .get_temp = dove_get_temp, | |
114 | }; | |
115 | ||
116 | static const struct of_device_id dove_thermal_id_table[] = { | |
117 | { .compatible = "marvell,dove-thermal" }, | |
118 | {} | |
119 | }; | |
120 | ||
121 | static 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 | ||
74ffa64c AL |
128 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
129 | if (!priv) | |
130 | return -ENOMEM; | |
131 | ||
c28f692c | 132 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
6bc51b66 SK |
133 | priv->sensor = devm_ioremap_resource(&pdev->dev, res); |
134 | if (IS_ERR(priv->sensor)) | |
135 | return PTR_ERR(priv->sensor); | |
74ffa64c AL |
136 | |
137 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
6bc51b66 SK |
138 | priv->control = devm_ioremap_resource(&pdev->dev, res); |
139 | if (IS_ERR(priv->control)) | |
140 | return PTR_ERR(priv->control); | |
74ffa64c AL |
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 | platform_set_drvdata(pdev, thermal); | |
157 | ||
158 | return 0; | |
159 | } | |
160 | ||
161 | static int dove_thermal_exit(struct platform_device *pdev) | |
162 | { | |
163 | struct thermal_zone_device *dove_thermal = | |
164 | platform_get_drvdata(pdev); | |
165 | ||
166 | thermal_zone_device_unregister(dove_thermal); | |
74ffa64c AL |
167 | |
168 | return 0; | |
169 | } | |
170 | ||
171 | MODULE_DEVICE_TABLE(of, dove_thermal_id_table); | |
172 | ||
173 | static struct platform_driver dove_thermal_driver = { | |
174 | .probe = dove_thermal_probe, | |
175 | .remove = dove_thermal_exit, | |
176 | .driver = { | |
177 | .name = "dove_thermal", | |
e0d68afa | 178 | .of_match_table = dove_thermal_id_table, |
74ffa64c AL |
179 | }, |
180 | }; | |
181 | ||
182 | module_platform_driver(dove_thermal_driver); | |
183 | ||
184 | MODULE_AUTHOR("Andrew Lunn <andrew@lunn.ch>"); | |
185 | MODULE_DESCRIPTION("Dove thermal driver"); | |
186 | MODULE_LICENSE("GPL"); |