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kongxinwei9a5238a2015-05-20 19:16:37 +08001/*
2 * Hisilicon thermal sensor driver
3 *
4 * Copyright (c) 2014-2015 Hisilicon Limited.
5 * Copyright (c) 2014-2015 Linaro Limited.
6 *
7 * Xinwei Kong <kong.kongxinwei@hisilicon.com>
8 * Leo Yan <leo.yan@linaro.org>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 *
14 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
15 * kind, whether express or implied; without even the implied warranty
16 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 */
19
20#include <linux/cpufreq.h>
21#include <linux/delay.h>
22#include <linux/interrupt.h>
23#include <linux/module.h>
24#include <linux/platform_device.h>
25#include <linux/io.h>
26
27#include "thermal_core.h"
28
29#define TEMP0_TH (0x4)
30#define TEMP0_RST_TH (0x8)
31#define TEMP0_CFG (0xC)
32#define TEMP0_EN (0x10)
33#define TEMP0_INT_EN (0x14)
34#define TEMP0_INT_CLR (0x18)
35#define TEMP0_RST_MSK (0x1C)
36#define TEMP0_VALUE (0x28)
37
38#define HISI_TEMP_BASE (-60)
39#define HISI_TEMP_RESET (100000)
40
41#define HISI_MAX_SENSORS 4
42
43struct hisi_thermal_sensor {
44 struct hisi_thermal_data *thermal;
45 struct thermal_zone_device *tzd;
46
47 long sensor_temp;
48 uint32_t id;
49 uint32_t thres_temp;
50};
51
52struct hisi_thermal_data {
53 struct mutex thermal_lock; /* protects register data */
54 struct platform_device *pdev;
55 struct clk *clk;
56 struct hisi_thermal_sensor sensors[HISI_MAX_SENSORS];
57
58 int irq, irq_bind_sensor;
59 bool irq_enabled;
60
61 void __iomem *regs;
62};
63
64/* in millicelsius */
65static inline int _step_to_temp(int step)
66{
67 /*
68 * Every step equals (1 * 200) / 255 celsius, and finally
69 * need convert to millicelsius.
70 */
Leo Yan5fdfc482016-03-29 19:23:32 +080071 return (HISI_TEMP_BASE * 1000 + (step * 200000 / 255));
kongxinwei9a5238a2015-05-20 19:16:37 +080072}
73
74static inline long _temp_to_step(long temp)
75{
Leo Yan5fdfc482016-03-29 19:23:32 +080076 return ((temp - HISI_TEMP_BASE * 1000) * 255) / 200000;
kongxinwei9a5238a2015-05-20 19:16:37 +080077}
78
79static long hisi_thermal_get_sensor_temp(struct hisi_thermal_data *data,
80 struct hisi_thermal_sensor *sensor)
81{
82 long val;
83
84 mutex_lock(&data->thermal_lock);
85
86 /* disable interrupt */
87 writel(0x0, data->regs + TEMP0_INT_EN);
88 writel(0x1, data->regs + TEMP0_INT_CLR);
89
90 /* disable module firstly */
91 writel(0x0, data->regs + TEMP0_EN);
92
93 /* select sensor id */
94 writel((sensor->id << 12), data->regs + TEMP0_CFG);
95
96 /* enable module */
97 writel(0x1, data->regs + TEMP0_EN);
98
99 usleep_range(3000, 5000);
100
101 val = readl(data->regs + TEMP0_VALUE);
102 val = _step_to_temp(val);
103
104 mutex_unlock(&data->thermal_lock);
105
106 return val;
107}
108
109static void hisi_thermal_enable_bind_irq_sensor
110 (struct hisi_thermal_data *data)
111{
112 struct hisi_thermal_sensor *sensor;
113
114 mutex_lock(&data->thermal_lock);
115
116 sensor = &data->sensors[data->irq_bind_sensor];
117
118 /* setting the hdak time */
119 writel(0x0, data->regs + TEMP0_CFG);
120
121 /* disable module firstly */
122 writel(0x0, data->regs + TEMP0_RST_MSK);
123 writel(0x0, data->regs + TEMP0_EN);
124
125 /* select sensor id */
126 writel((sensor->id << 12), data->regs + TEMP0_CFG);
127
128 /* enable for interrupt */
129 writel(_temp_to_step(sensor->thres_temp) | 0x0FFFFFF00,
130 data->regs + TEMP0_TH);
131
132 writel(_temp_to_step(HISI_TEMP_RESET), data->regs + TEMP0_RST_TH);
133
134 /* enable module */
135 writel(0x1, data->regs + TEMP0_RST_MSK);
136 writel(0x1, data->regs + TEMP0_EN);
137
138 writel(0x0, data->regs + TEMP0_INT_CLR);
139 writel(0x1, data->regs + TEMP0_INT_EN);
140
141 usleep_range(3000, 5000);
142
143 mutex_unlock(&data->thermal_lock);
144}
145
146static void hisi_thermal_disable_sensor(struct hisi_thermal_data *data)
147{
148 mutex_lock(&data->thermal_lock);
149
150 /* disable sensor module */
151 writel(0x0, data->regs + TEMP0_INT_EN);
152 writel(0x0, data->regs + TEMP0_RST_MSK);
153 writel(0x0, data->regs + TEMP0_EN);
154
155 mutex_unlock(&data->thermal_lock);
156}
157
Sascha Hauer17e83512015-07-24 08:12:54 +0200158static int hisi_thermal_get_temp(void *_sensor, int *temp)
kongxinwei9a5238a2015-05-20 19:16:37 +0800159{
160 struct hisi_thermal_sensor *sensor = _sensor;
161 struct hisi_thermal_data *data = sensor->thermal;
162
Leo Yan439dc962016-03-29 19:27:12 +0800163 int sensor_id = -1, i;
kongxinwei9a5238a2015-05-20 19:16:37 +0800164 long max_temp = 0;
165
166 *temp = hisi_thermal_get_sensor_temp(data, sensor);
167
168 sensor->sensor_temp = *temp;
169
170 for (i = 0; i < HISI_MAX_SENSORS; i++) {
Leo Yan439dc962016-03-29 19:27:12 +0800171 if (!data->sensors[i].tzd)
172 continue;
173
kongxinwei9a5238a2015-05-20 19:16:37 +0800174 if (data->sensors[i].sensor_temp >= max_temp) {
175 max_temp = data->sensors[i].sensor_temp;
176 sensor_id = i;
177 }
178 }
179
Leo Yan439dc962016-03-29 19:27:12 +0800180 /* If no sensor has been enabled, then skip to enable irq */
181 if (sensor_id == -1)
182 return 0;
183
kongxinwei9a5238a2015-05-20 19:16:37 +0800184 mutex_lock(&data->thermal_lock);
185 data->irq_bind_sensor = sensor_id;
186 mutex_unlock(&data->thermal_lock);
187
Sascha Hauer17e83512015-07-24 08:12:54 +0200188 dev_dbg(&data->pdev->dev, "id=%d, irq=%d, temp=%d, thres=%d\n",
kongxinwei9a5238a2015-05-20 19:16:37 +0800189 sensor->id, data->irq_enabled, *temp, sensor->thres_temp);
190 /*
191 * Bind irq to sensor for two cases:
192 * Reenable alarm IRQ if temperature below threshold;
193 * if irq has been enabled, always set it;
194 */
195 if (data->irq_enabled) {
196 hisi_thermal_enable_bind_irq_sensor(data);
197 return 0;
198 }
199
200 if (max_temp < sensor->thres_temp) {
201 data->irq_enabled = true;
202 hisi_thermal_enable_bind_irq_sensor(data);
203 enable_irq(data->irq);
204 }
205
206 return 0;
207}
208
209static struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
210 .get_temp = hisi_thermal_get_temp,
211};
212
213static irqreturn_t hisi_thermal_alarm_irq(int irq, void *dev)
214{
215 struct hisi_thermal_data *data = dev;
216
217 disable_irq_nosync(irq);
218 data->irq_enabled = false;
219
220 return IRQ_WAKE_THREAD;
221}
222
223static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
224{
225 struct hisi_thermal_data *data = dev;
226 struct hisi_thermal_sensor *sensor;
227 int i;
228
229 mutex_lock(&data->thermal_lock);
230 sensor = &data->sensors[data->irq_bind_sensor];
231
232 dev_crit(&data->pdev->dev, "THERMAL ALARM: T > %d\n",
233 sensor->thres_temp / 1000);
234 mutex_unlock(&data->thermal_lock);
235
Leo Yan439dc962016-03-29 19:27:12 +0800236 for (i = 0; i < HISI_MAX_SENSORS; i++) {
237 if (!data->sensors[i].tzd)
238 continue;
239
kongxinwei9a5238a2015-05-20 19:16:37 +0800240 thermal_zone_device_update(data->sensors[i].tzd);
Leo Yan439dc962016-03-29 19:27:12 +0800241 }
kongxinwei9a5238a2015-05-20 19:16:37 +0800242
243 return IRQ_HANDLED;
244}
245
246static int hisi_thermal_register_sensor(struct platform_device *pdev,
247 struct hisi_thermal_data *data,
248 struct hisi_thermal_sensor *sensor,
249 int index)
250{
251 int ret, i;
252 const struct thermal_trip *trip;
253
254 sensor->id = index;
255 sensor->thermal = data;
256
Eduardo Valentin44a520d2016-03-09 13:07:13 -0800257 sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
258 sensor->id, sensor, &hisi_of_thermal_ops);
kongxinwei9a5238a2015-05-20 19:16:37 +0800259 if (IS_ERR(sensor->tzd)) {
260 ret = PTR_ERR(sensor->tzd);
Leo Yan439dc962016-03-29 19:27:12 +0800261 sensor->tzd = NULL;
kongxinwei9a5238a2015-05-20 19:16:37 +0800262 dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
263 sensor->id, ret);
264 return ret;
265 }
266
267 trip = of_thermal_get_trip_points(sensor->tzd);
268
269 for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
270 if (trip[i].type == THERMAL_TRIP_PASSIVE) {
271 sensor->thres_temp = trip[i].temperature;
272 break;
273 }
274 }
275
276 return 0;
277}
278
279static const struct of_device_id of_hisi_thermal_match[] = {
280 { .compatible = "hisilicon,tsensor" },
281 { /* end */ }
282};
283MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);
284
285static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
286 bool on)
287{
288 struct thermal_zone_device *tzd = sensor->tzd;
289
290 tzd->ops->set_mode(tzd,
291 on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
292}
293
294static int hisi_thermal_probe(struct platform_device *pdev)
295{
296 struct hisi_thermal_data *data;
297 struct resource *res;
298 int i;
299 int ret;
300
301 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
302 if (!data)
303 return -ENOMEM;
304
305 mutex_init(&data->thermal_lock);
306 data->pdev = pdev;
307
308 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
309 data->regs = devm_ioremap_resource(&pdev->dev, res);
310 if (IS_ERR(data->regs)) {
311 dev_err(&pdev->dev, "failed to get io address\n");
312 return PTR_ERR(data->regs);
313 }
314
315 data->irq = platform_get_irq(pdev, 0);
316 if (data->irq < 0)
317 return data->irq;
318
319 ret = devm_request_threaded_irq(&pdev->dev, data->irq,
320 hisi_thermal_alarm_irq,
321 hisi_thermal_alarm_irq_thread,
322 0, "hisi_thermal", data);
323 if (ret < 0) {
324 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
325 return ret;
326 }
327
328 platform_set_drvdata(pdev, data);
329
330 data->clk = devm_clk_get(&pdev->dev, "thermal_clk");
331 if (IS_ERR(data->clk)) {
332 ret = PTR_ERR(data->clk);
333 if (ret != -EPROBE_DEFER)
334 dev_err(&pdev->dev,
335 "failed to get thermal clk: %d\n", ret);
336 return ret;
337 }
338
339 /* enable clock for thermal */
340 ret = clk_prepare_enable(data->clk);
341 if (ret) {
342 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
343 return ret;
344 }
345
Leo Yan469ace02016-03-29 19:27:13 +0800346 hisi_thermal_enable_bind_irq_sensor(data);
347 irq_get_irqchip_state(data->irq, IRQCHIP_STATE_MASKED,
348 &data->irq_enabled);
349
kongxinwei9a5238a2015-05-20 19:16:37 +0800350 for (i = 0; i < HISI_MAX_SENSORS; ++i) {
351 ret = hisi_thermal_register_sensor(pdev, data,
352 &data->sensors[i], i);
Leo Yan439dc962016-03-29 19:27:12 +0800353 if (ret)
kongxinwei9a5238a2015-05-20 19:16:37 +0800354 dev_err(&pdev->dev,
355 "failed to register thermal sensor: %d\n", ret);
Leo Yan439dc962016-03-29 19:27:12 +0800356 else
357 hisi_thermal_toggle_sensor(&data->sensors[i], true);
kongxinwei9a5238a2015-05-20 19:16:37 +0800358 }
359
kongxinwei9a5238a2015-05-20 19:16:37 +0800360 return 0;
kongxinwei9a5238a2015-05-20 19:16:37 +0800361}
362
363static int hisi_thermal_remove(struct platform_device *pdev)
364{
365 struct hisi_thermal_data *data = platform_get_drvdata(pdev);
366 int i;
367
368 for (i = 0; i < HISI_MAX_SENSORS; i++) {
369 struct hisi_thermal_sensor *sensor = &data->sensors[i];
370
Leo Yan439dc962016-03-29 19:27:12 +0800371 if (!sensor->tzd)
372 continue;
373
kongxinwei9a5238a2015-05-20 19:16:37 +0800374 hisi_thermal_toggle_sensor(sensor, false);
kongxinwei9a5238a2015-05-20 19:16:37 +0800375 }
376
377 hisi_thermal_disable_sensor(data);
378 clk_disable_unprepare(data->clk);
379
380 return 0;
381}
382
383#ifdef CONFIG_PM_SLEEP
384static int hisi_thermal_suspend(struct device *dev)
385{
386 struct hisi_thermal_data *data = dev_get_drvdata(dev);
387
388 hisi_thermal_disable_sensor(data);
389 data->irq_enabled = false;
390
391 clk_disable_unprepare(data->clk);
392
393 return 0;
394}
395
396static int hisi_thermal_resume(struct device *dev)
397{
398 struct hisi_thermal_data *data = dev_get_drvdata(dev);
399
400 clk_prepare_enable(data->clk);
401
402 data->irq_enabled = true;
403 hisi_thermal_enable_bind_irq_sensor(data);
404
405 return 0;
406}
407#endif
408
409static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
410 hisi_thermal_suspend, hisi_thermal_resume);
411
412static struct platform_driver hisi_thermal_driver = {
413 .driver = {
414 .name = "hisi_thermal",
kongxinwei9a5238a2015-05-20 19:16:37 +0800415 .pm = &hisi_thermal_pm_ops,
416 .of_match_table = of_hisi_thermal_match,
417 },
418 .probe = hisi_thermal_probe,
419 .remove = hisi_thermal_remove,
420};
421
422module_platform_driver(hisi_thermal_driver);
423
424MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
425MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
426MODULE_DESCRIPTION("Hisilicon thermal driver");
427MODULE_LICENSE("GPL v2");