summaryrefslogtreecommitdiffstats
path: root/drivers/thermal/armada_thermal.c
blob: 5b4d75fd7b49f3f857e39dacc04488977c3d448b (plain)
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
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
/*
 * Marvell Armada 370/XP thermal sensor driver
 *
 * Copyright (C) 2013 Marvell
 *
 * 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/delay.h>
#include <linux/platform_device.h>
#include <linux/of_device.h>
#include <linux/thermal.h>

#define THERMAL_VALID_OFFSET		9
#define THERMAL_VALID_MASK		0x1
#define THERMAL_TEMP_OFFSET		10
#define THERMAL_TEMP_MASK		0x1ff

/* Thermal Manager Control and Status Register */
#define PMU_TDC0_SW_RST_MASK		(0x1 << 1)
#define PMU_TM_DISABLE_OFFS		0
#define PMU_TM_DISABLE_MASK		(0x1 << PMU_TM_DISABLE_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_OTF_CAL_MASK		(0x1 << 30)
#define PMU_TDC0_START_CAL_MASK		(0x1 << 25)

struct armada_thermal_ops;

/* Marvell EBU Thermal Sensor Dev Structure */
struct armada_thermal_priv {
	void __iomem *sensor;
	void __iomem *control;
	struct armada_thermal_ops *ops;
};

struct armada_thermal_ops {
	/* Initialize the sensor */
	void (*init_sensor)(struct armada_thermal_priv *);

	/* Test for a valid sensor value (optional) */
	bool (*is_valid)(struct armada_thermal_priv *);
};

static void armadaxp_init_sensor(struct armada_thermal_priv *priv)
{
	unsigned long reg;

	reg = readl_relaxed(priv->control);
	reg |= PMU_TDC0_OTF_CAL_MASK;
	writel(reg, priv->control);

	/* Reference calibration value */
	reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
	reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_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);
}

static void armada370_init_sensor(struct armada_thermal_priv *priv)
{
	unsigned long reg;

	reg = readl_relaxed(priv->control);
	reg |= PMU_TDC0_OTF_CAL_MASK;
	writel(reg, priv->control);

	/* Reference calibration value */
	reg &= ~PMU_TDC0_REF_CAL_CNT_MASK;
	reg |= (0xf1 << PMU_TDC0_REF_CAL_CNT_OFFS);
	writel(reg, priv->control);

	reg &= ~PMU_TDC0_START_CAL_MASK;
	writel(reg, priv->control);

	mdelay(10);
}

static bool armada_is_valid(struct armada_thermal_priv *priv)
{
	unsigned long reg = readl_relaxed(priv->sensor);

	return (reg >> THERMAL_VALID_OFFSET) & THERMAL_VALID_MASK;
}

static int armada_get_temp(struct thermal_zone_device *thermal,
			  unsigned long *temp)
{
	struct armada_thermal_priv *priv = thermal->devdata;
	unsigned long reg;

	/* Valid check */
	if (priv->ops->is_valid && !priv->ops->is_valid(priv)) {
		dev_err(&thermal->device,
			"Temperature sensor reading not valid\n");
		return -EIO;
	}

	reg = readl_relaxed(priv->sensor);
	reg = (reg >> THERMAL_TEMP_OFFSET) & THERMAL_TEMP_MASK;
	*temp = (3153000000UL - (10000000UL*reg)) / 13825;
	return 0;
}

static struct thermal_zone_device_ops ops = {
	.get_temp = armada_get_temp,
};

static const struct armada_thermal_ops armadaxp_ops = {
	.init_sensor = armadaxp_init_sensor,
};

static const struct armada_thermal_ops armada370_ops = {
	.is_valid = armada_is_valid,
	.init_sensor = armada370_init_sensor,
};

static const struct of_device_id armada_thermal_id_table[] = {
	{
		.compatible = "marvell,armadaxp-thermal",
		.data       = &armadaxp_ops,
	},
	{
		.compatible = "marvell,armada370-thermal",
		.data       = &armada370_ops,
	},
	{
		/* sentinel */
	},
};
MODULE_DEVICE_TABLE(of, armada_thermal_id_table);

static int armada_thermal_probe(struct platform_device *pdev)
{
	struct thermal_zone_device *thermal;
	const struct of_device_id *match;
	struct armada_thermal_priv *priv;
	struct resource *res;

	match = of_match_device(armada_thermal_id_table, &pdev->dev);
	if (!match)
		return -ENODEV;

	priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		dev_err(&pdev->dev, "Failed to get platform resource\n");
		return -ENODEV;
	}

	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);

	priv->ops = (struct armada_thermal_ops *)match->data;
	priv->ops->init_sensor(priv);

	thermal = thermal_zone_device_register("armada_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 armada_thermal_exit(struct platform_device *pdev)
{
	struct thermal_zone_device *armada_thermal =
		platform_get_drvdata(pdev);

	thermal_zone_device_unregister(armada_thermal);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct platform_driver armada_thermal_driver = {
	.probe = armada_thermal_probe,
	.remove = armada_thermal_exit,
	.driver = {
		.name = "armada_thermal",
		.owner = THIS_MODULE,
		.of_match_table = of_match_ptr(armada_thermal_id_table),
	},
};

module_platform_driver(armada_thermal_driver);

MODULE_AUTHOR("Ezequiel Garcia <ezequiel.garcia@free-electrons.com>");
MODULE_DESCRIPTION("Armada 370/XP thermal driver");
MODULE_LICENSE("GPL v2");
OpenPOWER on IntegriCloud