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1 | /* |
2 | * Marvell Armada 370/XP thermal sensor driver |
3 | * |
4 | * Copyright (C) 2013 Marvell |
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/delay.h> |
23 | #include <linux/platform_device.h> |
24 | #include <linux/of_device.h> |
25 | #include <linux/thermal.h> |
26 | |
27 | #define THERMAL_VALID_OFFSET 9 |
28 | #define THERMAL_VALID_MASK 0x1 |
29 | #define THERMAL_TEMP_OFFSET 10 |
30 | #define THERMAL_TEMP_MASK 0x1ff |
31 | |
32 | /* Thermal Manager Control and Status Register */ |
33 | #define PMU_TDC0_SW_RST_MASK (0x1 << 1) |
34 | #define PMU_TM_DISABLE_OFFS 0 |
35 | #define PMU_TM_DISABLE_MASK (0x1 << PMU_TM_DISABLE_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_OTF_CAL_MASK (0x1 << 30) |
39 | #define PMU_TDC0_START_CAL_MASK (0x1 << 25) |
40 | |
41 | struct armada_thermal_ops; |
42 | |
43 | /* Marvell EBU Thermal Sensor Dev Structure */ |
44 | struct armada_thermal_priv { |
45 | void __iomem *sensor; |
46 | void __iomem *control; |
47 | struct armada_thermal_ops *ops; |
48 | }; |
49 | |
50 | struct armada_thermal_ops { |
51 | /* Initialize the sensor */ |
52 | void (*init_sensor)(struct armada_thermal_priv *); |
53 | |
54 | /* Test for a valid sensor value (optional) */ |
55 | bool (*is_valid)(struct armada_thermal_priv *); |
56 | }; |
57 | |
58 | static void armadaxp_init_sensor(struct armada_thermal_priv *priv) |
59 | { |
60 | unsigned long reg; |
61 | |
62 | reg = readl_relaxed(priv->control); |
63 | reg |= PMU_TDC0_OTF_CAL_MASK; |
64 | writel(reg, priv->control); |
65 | |
66 | /* Reference calibration value */ |
67 | reg &= ~PMU_TDC0_REF_CAL_CNT_MASK; |
68 | reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS); |
69 | writel(reg, priv->control); |
70 | |
71 | /* Reset the sensor */ |
72 | reg = readl_relaxed(priv->control); |
73 | writel((reg | PMU_TDC0_SW_RST_MASK), priv->control); |
74 | |
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 | |
83 | static void armada370_init_sensor(struct armada_thermal_priv *priv) |
84 | { |
85 | unsigned long reg; |
86 | |
87 | reg = readl_relaxed(priv->control); |
88 | reg |= PMU_TDC0_OTF_CAL_MASK; |
89 | writel(reg, priv->control); |
90 | |
91 | /* Reference calibration value */ |
92 | reg &= ~PMU_TDC0_REF_CAL_CNT_MASK; |
93 | reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS); |
94 | writel(reg, priv->control); |
95 | |
96 | reg &= ~PMU_TDC0_START_CAL_MASK; |
97 | writel(reg, priv->control); |
98 | |
99 | mdelay(10); |
100 | } |
101 | |
102 | static bool armada_is_valid(struct armada_thermal_priv *priv) |
103 | { |
104 | unsigned long reg = readl_relaxed(priv->sensor); |
105 | |
106 | return (reg >> THERMAL_VALID_OFFSET) & THERMAL_VALID_MASK; |
107 | } |
108 | |
109 | static int armada_get_temp(struct thermal_zone_device *thermal, |
110 | unsigned long *temp) |
111 | { |
112 | struct armada_thermal_priv *priv = thermal->devdata; |
113 | unsigned long reg; |
114 | |
115 | /* Valid check */ |
116 | if (priv->ops->is_valid && !priv->ops->is_valid(priv)) { |
117 | dev_err(&thermal->device, |
118 | "Temperature sensor reading not valid\n"); |
119 | return -EIO; |
120 | } |
121 | |
122 | reg = readl_relaxed(priv->sensor); |
123 | reg = (reg >> THERMAL_TEMP_OFFSET) & THERMAL_TEMP_MASK; |
124 | *temp = (3153000000UL - (10000000UL*reg)) / 13825; |
125 | return 0; |
126 | } |
127 | |
128 | static struct thermal_zone_device_ops ops = { |
129 | .get_temp = armada_get_temp, |
130 | }; |
131 | |
132 | static const struct armada_thermal_ops armadaxp_ops = { |
133 | .init_sensor = armadaxp_init_sensor, |
134 | }; |
135 | |
136 | static const struct armada_thermal_ops armada370_ops = { |
137 | .is_valid = armada_is_valid, |
138 | .init_sensor = armada370_init_sensor, |
139 | }; |
140 | |
141 | static const struct of_device_id armada_thermal_id_table[] = { |
142 | { |
143 | .compatible = "marvell,armadaxp-thermal", |
144 | .data = &armadaxp_ops, |
145 | }, |
146 | { |
147 | .compatible = "marvell,armada370-thermal", |
148 | .data = &armada370_ops, |
149 | }, |
150 | { |
151 | /* sentinel */ |
152 | }, |
153 | }; |
154 | MODULE_DEVICE_TABLE(of, armada_thermal_id_table); |
155 | |
156 | static int armada_thermal_probe(struct platform_device *pdev) |
157 | { |
158 | struct thermal_zone_device *thermal; |
159 | const struct of_device_id *match; |
160 | struct armada_thermal_priv *priv; |
161 | struct resource *res; |
162 | |
163 | match = of_match_device(armada_thermal_id_table, &pdev->dev); |
164 | if (!match) |
165 | return -ENODEV; |
166 | |
167 | priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); |
168 | if (!priv) |
169 | return -ENOMEM; |
170 | |
171 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
172 | priv->sensor = devm_ioremap_resource(&pdev->dev, res); |
173 | if (IS_ERR(priv->sensor)) |
174 | return PTR_ERR(priv->sensor); |
175 | |
176 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); |
177 | priv->control = devm_ioremap_resource(&pdev->dev, res); |
178 | if (IS_ERR(priv->control)) |
179 | return PTR_ERR(priv->control); |
180 | |
181 | priv->ops = (struct armada_thermal_ops *)match->data; |
182 | priv->ops->init_sensor(priv); |
183 | |
184 | thermal = thermal_zone_device_register("armada_thermal", 0, 0, |
185 | priv, &ops, NULL, 0, 0); |
186 | if (IS_ERR(thermal)) { |
187 | dev_err(&pdev->dev, |
188 | "Failed to register thermal zone device\n"); |
189 | return PTR_ERR(thermal); |
190 | } |
191 | |
192 | platform_set_drvdata(pdev, thermal); |
193 | |
194 | return 0; |
195 | } |
196 | |
197 | static int armada_thermal_exit(struct platform_device *pdev) |
198 | { |
199 | struct thermal_zone_device *armada_thermal = |
200 | platform_get_drvdata(pdev); |
201 | |
202 | thermal_zone_device_unregister(armada_thermal); |
203 | |
204 | return 0; |
205 | } |
206 | |
207 | static struct platform_driver armada_thermal_driver = { |
208 | .probe = armada_thermal_probe, |
209 | .remove = armada_thermal_exit, |
210 | .driver = { |
211 | .name = "armada_thermal", |
212 | .owner = THIS_MODULE, |
213 | .of_match_table = armada_thermal_id_table, |
214 | }, |
215 | }; |
216 | |
217 | module_platform_driver(armada_thermal_driver); |
218 | |
219 | MODULE_AUTHOR("Ezequiel Garcia <ezequiel.garcia@free-electrons.com>"); |
220 | MODULE_DESCRIPTION("Armada 370/XP thermal driver"); |
221 | MODULE_LICENSE("GPL v2"); |
222 |
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