File: intel_bxt_pmic_thermal.c

package info (click to toggle)
linux 4.19.20-1
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 954,852 kB
  • sloc: ansic: 16,749,828; asm: 271,286; makefile: 38,257; sh: 32,808; perl: 27,671; python: 21,022; cpp: 5,063; yacc: 4,648; lex: 2,585; awk: 1,385; ruby: 25; sed: 5
file content (299 lines) | stat: -rw-r--r-- 7,155 bytes parent folder | download | duplicates (6)
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
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
/*
 * Intel Broxton PMIC thermal driver
 *
 * Copyright (C) 2016 Intel Corporation. All rights reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License version
 * 2 as published by the Free Software Foundation.
 *
 * 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/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/device.h>
#include <linux/thermal.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/mfd/intel_soc_pmic.h>

#define BXTWC_THRM0IRQ		0x4E04
#define BXTWC_THRM1IRQ		0x4E05
#define BXTWC_THRM2IRQ		0x4E06
#define BXTWC_MTHRM0IRQ		0x4E12
#define BXTWC_MTHRM1IRQ		0x4E13
#define BXTWC_MTHRM2IRQ		0x4E14
#define BXTWC_STHRM0IRQ		0x4F19
#define BXTWC_STHRM1IRQ		0x4F1A
#define BXTWC_STHRM2IRQ		0x4F1B

struct trip_config_map {
	u16 irq_reg;
	u16 irq_en;
	u16 evt_stat;
	u8 irq_mask;
	u8 irq_en_mask;
	u8 evt_mask;
	u8 trip_num;
};

struct thermal_irq_map {
	char handle[20];
	int num_trips;
	const struct trip_config_map *trip_config;
};

struct pmic_thermal_data {
	const struct thermal_irq_map *maps;
	int num_maps;
};

static const struct trip_config_map bxtwc_str0_trip_config[] = {
	{
		.irq_reg = BXTWC_THRM0IRQ,
		.irq_mask = 0x01,
		.irq_en = BXTWC_MTHRM0IRQ,
		.irq_en_mask = 0x01,
		.evt_stat = BXTWC_STHRM0IRQ,
		.evt_mask = 0x01,
		.trip_num = 0
	},
	{
		.irq_reg = BXTWC_THRM0IRQ,
		.irq_mask = 0x10,
		.irq_en = BXTWC_MTHRM0IRQ,
		.irq_en_mask = 0x10,
		.evt_stat = BXTWC_STHRM0IRQ,
		.evt_mask = 0x10,
		.trip_num = 1
	}
};

static const struct trip_config_map bxtwc_str1_trip_config[] = {
	{
		.irq_reg = BXTWC_THRM0IRQ,
		.irq_mask = 0x02,
		.irq_en = BXTWC_MTHRM0IRQ,
		.irq_en_mask = 0x02,
		.evt_stat = BXTWC_STHRM0IRQ,
		.evt_mask = 0x02,
		.trip_num = 0
	},
	{
		.irq_reg = BXTWC_THRM0IRQ,
		.irq_mask = 0x20,
		.irq_en = BXTWC_MTHRM0IRQ,
		.irq_en_mask = 0x20,
		.evt_stat = BXTWC_STHRM0IRQ,
		.evt_mask = 0x20,
		.trip_num = 1
	},
};

static const struct trip_config_map bxtwc_str2_trip_config[] = {
	{
		.irq_reg = BXTWC_THRM0IRQ,
		.irq_mask = 0x04,
		.irq_en = BXTWC_MTHRM0IRQ,
		.irq_en_mask = 0x04,
		.evt_stat = BXTWC_STHRM0IRQ,
		.evt_mask = 0x04,
		.trip_num = 0
	},
	{
		.irq_reg = BXTWC_THRM0IRQ,
		.irq_mask = 0x40,
		.irq_en = BXTWC_MTHRM0IRQ,
		.irq_en_mask = 0x40,
		.evt_stat = BXTWC_STHRM0IRQ,
		.evt_mask = 0x40,
		.trip_num = 1
	},
};

static const struct trip_config_map bxtwc_str3_trip_config[] = {
	{
		.irq_reg = BXTWC_THRM2IRQ,
		.irq_mask = 0x10,
		.irq_en = BXTWC_MTHRM2IRQ,
		.irq_en_mask = 0x10,
		.evt_stat = BXTWC_STHRM2IRQ,
		.evt_mask = 0x10,
		.trip_num = 0
	},
};

static const struct thermal_irq_map bxtwc_thermal_irq_map[] = {
	{
		.handle = "STR0",
		.trip_config = bxtwc_str0_trip_config,
		.num_trips = ARRAY_SIZE(bxtwc_str0_trip_config),
	},
	{
		.handle = "STR1",
		.trip_config = bxtwc_str1_trip_config,
		.num_trips = ARRAY_SIZE(bxtwc_str1_trip_config),
	},
	{
		.handle = "STR2",
		.trip_config = bxtwc_str2_trip_config,
		.num_trips = ARRAY_SIZE(bxtwc_str2_trip_config),
	},
	{
		.handle = "STR3",
		.trip_config = bxtwc_str3_trip_config,
		.num_trips = ARRAY_SIZE(bxtwc_str3_trip_config),
	},
};

static const struct pmic_thermal_data bxtwc_thermal_data = {
	.maps = bxtwc_thermal_irq_map,
	.num_maps = ARRAY_SIZE(bxtwc_thermal_irq_map),
};

static irqreturn_t pmic_thermal_irq_handler(int irq, void *data)
{
	struct platform_device *pdev = data;
	struct thermal_zone_device *tzd;
	struct pmic_thermal_data *td;
	struct intel_soc_pmic *pmic;
	struct regmap *regmap;
	u8 reg_val, mask, irq_stat;
	u16 reg, evt_stat_reg;
	int i, j, ret;

	pmic = dev_get_drvdata(pdev->dev.parent);
	regmap = pmic->regmap;
	td = (struct pmic_thermal_data *)
		platform_get_device_id(pdev)->driver_data;

	/* Resolve thermal irqs */
	for (i = 0; i < td->num_maps; i++) {
		for (j = 0; j < td->maps[i].num_trips; j++) {
			reg = td->maps[i].trip_config[j].irq_reg;
			mask = td->maps[i].trip_config[j].irq_mask;
			/*
			 * Read the irq register to resolve whether the
			 * interrupt was triggered for this sensor
			 */
			if (regmap_read(regmap, reg, &ret))
				return IRQ_HANDLED;

			reg_val = (u8)ret;
			irq_stat = ((u8)ret & mask);

			if (!irq_stat)
				continue;

			/*
			 * Read the status register to find out what
			 * event occurred i.e a high or a low
			 */
			evt_stat_reg = td->maps[i].trip_config[j].evt_stat;
			if (regmap_read(regmap, evt_stat_reg, &ret))
				return IRQ_HANDLED;

			tzd = thermal_zone_get_zone_by_name(td->maps[i].handle);
			if (!IS_ERR(tzd))
				thermal_zone_device_update(tzd,
						THERMAL_EVENT_UNSPECIFIED);

			/* Clear the appropriate irq */
			regmap_write(regmap, reg, reg_val & mask);
		}
	}

	return IRQ_HANDLED;
}

static int pmic_thermal_probe(struct platform_device *pdev)
{
	struct regmap_irq_chip_data *regmap_irq_chip;
	struct pmic_thermal_data *thermal_data;
	int ret, irq, virq, i, j, pmic_irq_count;
	struct intel_soc_pmic *pmic;
	struct regmap *regmap;
	struct device *dev;
	u16 reg;
	u8 mask;

	dev = &pdev->dev;
	pmic = dev_get_drvdata(pdev->dev.parent);
	if (!pmic) {
		dev_err(dev, "Failed to get struct intel_soc_pmic pointer\n");
		return -ENODEV;
	}

	thermal_data = (struct pmic_thermal_data *)
				platform_get_device_id(pdev)->driver_data;
	if (!thermal_data) {
		dev_err(dev, "No thermal data initialized!!\n");
		return -ENODEV;
	}

	regmap = pmic->regmap;
	regmap_irq_chip = pmic->irq_chip_data;

	pmic_irq_count = 0;
	while ((irq = platform_get_irq(pdev, pmic_irq_count)) != -ENXIO) {
		virq = regmap_irq_get_virq(regmap_irq_chip, irq);
		if (virq < 0) {
			dev_err(dev, "failed to get virq by irq %d\n", irq);
			return virq;
		}

		ret = devm_request_threaded_irq(&pdev->dev, virq,
				NULL, pmic_thermal_irq_handler,
				IRQF_ONESHOT, "pmic_thermal", pdev);

		if (ret) {
			dev_err(dev, "request irq(%d) failed: %d\n", virq, ret);
			return ret;
		}
		pmic_irq_count++;
	}

	/* Enable thermal interrupts */
	for (i = 0; i < thermal_data->num_maps; i++) {
		for (j = 0; j < thermal_data->maps[i].num_trips; j++) {
			reg = thermal_data->maps[i].trip_config[j].irq_en;
			mask = thermal_data->maps[i].trip_config[j].irq_en_mask;
			ret = regmap_update_bits(regmap, reg, mask, 0x00);
			if (ret)
				return ret;
		}
	}

	return 0;
}

static const struct platform_device_id pmic_thermal_id_table[] = {
	{
		.name = "bxt_wcove_thermal",
		.driver_data = (kernel_ulong_t)&bxtwc_thermal_data,
	},
	{},
};

static struct platform_driver pmic_thermal_driver = {
	.probe = pmic_thermal_probe,
	.driver = {
		.name = "pmic_thermal",
	},
	.id_table = pmic_thermal_id_table,
};

MODULE_DEVICE_TABLE(platform, pmic_thermal_id_table);
module_platform_driver(pmic_thermal_driver);

MODULE_AUTHOR("Yegnesh S Iyer <yegnesh.s.iyer@intel.com>");
MODULE_DESCRIPTION("Intel Broxton PMIC Thermal Driver");
MODULE_LICENSE("GPL v2");