summaryrefslogtreecommitdiffstats
path: root/drivers/thermal/imx8mm_thermal.c
blob: 0d60f8d7894f8c0f9ff20951bb36932dd4eed6d4 (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
233
234
235
236
// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright 2020 NXP.
 *
 * Author: Anson Huang <Anson.Huang@nxp.com>
 */

#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/thermal.h>

#include "thermal_core.h"

#define TER			0x0	/* TMU enable */
#define TPS			0x4
#define TRITSR			0x20	/* TMU immediate temp */

#define TER_EN			BIT(31)
#define TRITSR_TEMP0_VAL_MASK	0xff
#define TRITSR_TEMP1_VAL_MASK	0xff0000

#define PROBE_SEL_ALL		GENMASK(31, 30)

#define probe_status_offset(x)	(30 + x)
#define SIGN_BIT		BIT(7)
#define TEMP_VAL_MASK		GENMASK(6, 0)

#define VER1_TEMP_LOW_LIMIT	10000
#define VER2_TEMP_LOW_LIMIT	-40000
#define VER2_TEMP_HIGH_LIMIT	125000

#define TMU_VER1		0x1
#define TMU_VER2		0x2

struct thermal_soc_data {
	u32 num_sensors;
	u32 version;
	int (*get_temp)(void *, int *);
};

struct tmu_sensor {
	struct imx8mm_tmu *priv;
	u32 hw_id;
	struct thermal_zone_device *tzd;
};

struct imx8mm_tmu {
	void __iomem *base;
	struct clk *clk;
	const struct thermal_soc_data *socdata;
	struct tmu_sensor sensors[0];
};

static int imx8mm_tmu_get_temp(void *data, int *temp)
{
	struct tmu_sensor *sensor = data;
	struct imx8mm_tmu *tmu = sensor->priv;
	u32 val;

	val = readl_relaxed(tmu->base + TRITSR) & TRITSR_TEMP0_VAL_MASK;
	*temp = val * 1000;
	if (*temp < VER1_TEMP_LOW_LIMIT)
		return -EAGAIN;

	return 0;
}

static int imx8mp_tmu_get_temp(void *data, int *temp)
{
	struct tmu_sensor *sensor = data;
	struct imx8mm_tmu *tmu = sensor->priv;
	unsigned long val;
	bool ready;

	val = readl_relaxed(tmu->base + TRITSR);
	ready = test_bit(probe_status_offset(sensor->hw_id), &val);
	if (!ready)
		return -EAGAIN;

	val = sensor->hw_id ? FIELD_GET(TRITSR_TEMP1_VAL_MASK, val) :
	      FIELD_GET(TRITSR_TEMP0_VAL_MASK, val);
	if (val & SIGN_BIT) /* negative */
		val = (~(val & TEMP_VAL_MASK) + 1);

	*temp = val * 1000;
	if (*temp < VER2_TEMP_LOW_LIMIT || *temp > VER2_TEMP_HIGH_LIMIT)
		return -EAGAIN;

	return 0;
}

static int tmu_get_temp(void *data, int *temp)
{
	struct tmu_sensor *sensor = data;
	struct imx8mm_tmu *tmu = sensor->priv;

	return tmu->socdata->get_temp(data, temp);
}

static struct thermal_zone_of_device_ops tmu_tz_ops = {
	.get_temp = tmu_get_temp,
};

static void imx8mm_tmu_enable(struct imx8mm_tmu *tmu, bool enable)
{
	u32 val;

	val = readl_relaxed(tmu->base + TER);
	val = enable ? (val | TER_EN) : (val & ~TER_EN);
	writel_relaxed(val, tmu->base + TER);
}

static void imx8mm_tmu_probe_sel_all(struct imx8mm_tmu *tmu)
{
	u32 val;

	val = readl_relaxed(tmu->base + TPS);
	val |= PROBE_SEL_ALL;
	writel_relaxed(val, tmu->base + TPS);
}

static int imx8mm_tmu_probe(struct platform_device *pdev)
{
	const struct thermal_soc_data *data;
	struct imx8mm_tmu *tmu;
	int ret;
	int i;

	data = of_device_get_match_data(&pdev->dev);

	tmu = devm_kzalloc(&pdev->dev, struct_size(tmu, sensors,
			   data->num_sensors), GFP_KERNEL);
	if (!tmu)
		return -ENOMEM;

	tmu->socdata = data;

	tmu->base = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(tmu->base))
		return PTR_ERR(tmu->base);

	tmu->clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(tmu->clk)) {
		ret = PTR_ERR(tmu->clk);
		if (ret != -EPROBE_DEFER)
			dev_err(&pdev->dev,
				"failed to get tmu clock: %d\n", ret);
		return ret;
	}

	ret = clk_prepare_enable(tmu->clk);
	if (ret) {
		dev_err(&pdev->dev, "failed to enable tmu clock: %d\n", ret);
		return ret;
	}

	/* disable the monitor during initialization */
	imx8mm_tmu_enable(tmu, false);

	for (i = 0; i < data->num_sensors; i++) {
		tmu->sensors[i].priv = tmu;
		tmu->sensors[i].tzd =
			devm_thermal_zone_of_sensor_register(&pdev->dev, i,
							     &tmu->sensors[i],
							     &tmu_tz_ops);
		if (IS_ERR(tmu->sensors[i].tzd)) {
			dev_err(&pdev->dev,
				"failed to register thermal zone sensor[%d]: %d\n",
				i, ret);
			return PTR_ERR(tmu->sensors[i].tzd);
		}
		tmu->sensors[i].hw_id = i;
	}

	platform_set_drvdata(pdev, tmu);

	/* enable all the probes for V2 TMU */
	if (tmu->socdata->version == TMU_VER2)
		imx8mm_tmu_probe_sel_all(tmu);

	/* enable the monitor */
	imx8mm_tmu_enable(tmu, true);

	return 0;
}

static int imx8mm_tmu_remove(struct platform_device *pdev)
{
	struct imx8mm_tmu *tmu = platform_get_drvdata(pdev);

	/* disable TMU */
	imx8mm_tmu_enable(tmu, false);

	clk_disable_unprepare(tmu->clk);
	platform_set_drvdata(pdev, NULL);

	return 0;
}

static struct thermal_soc_data imx8mm_tmu_data = {
	.num_sensors = 1,
	.version = TMU_VER1,
	.get_temp = imx8mm_tmu_get_temp,
};

static struct thermal_soc_data imx8mp_tmu_data = {
	.num_sensors = 2,
	.version = TMU_VER2,
	.get_temp = imx8mp_tmu_get_temp,
};

static const struct of_device_id imx8mm_tmu_table[] = {
	{ .compatible = "fsl,imx8mm-tmu", .data = &imx8mm_tmu_data, },
	{ .compatible = "fsl,imx8mp-tmu", .data = &imx8mp_tmu_data, },
	{ },
};

static struct platform_driver imx8mm_tmu = {
	.driver = {
		.name	= "i.mx8mm_thermal",
		.of_match_table = imx8mm_tmu_table,
	},
	.probe = imx8mm_tmu_probe,
	.remove = imx8mm_tmu_remove,
};
module_platform_driver(imx8mm_tmu);

MODULE_AUTHOR("Anson Huang <Anson.Huang@nxp.com>");
MODULE_DESCRIPTION("i.MX8MM Thermal Monitor Unit driver");
MODULE_LICENSE("GPL v2");