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crypto: api - Extend algorithm name limit to 128 bytes
[linux-stable.git] / drivers / thermal / hisi_thermal.c
blobf6429666a1cfe03d1f122266938a5343cf744054
1 /*
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
43 struct 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
52 struct 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 */
65 static 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 */
71 return (HISI_TEMP_BASE * 1000 + (step * 200000 / 255));
72 }
73
74 static inline long _temp_to_step(long temp)
75 {
76 return ((temp - HISI_TEMP_BASE * 1000) * 255) / 200000;
77 }
78
79 static 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
109 static 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
146 static 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
158 static int hisi_thermal_get_temp(void *_sensor, int *temp)
159 {
160 struct hisi_thermal_sensor *sensor = _sensor;
161 struct hisi_thermal_data *data = sensor->thermal;
162
163 int sensor_id = -1, i;
164 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++) {
171 if (!data->sensors[i].tzd)
172 continue;
173
174 if (data->sensors[i].sensor_temp >= max_temp) {
175 max_temp = data->sensors[i].sensor_temp;
176 sensor_id = i;
177 }
178 }
179
180 /* If no sensor has been enabled, then skip to enable irq */
181 if (sensor_id == -1)
182 return 0;
183
184 mutex_lock(&data->thermal_lock);
185 data->irq_bind_sensor = sensor_id;
186 mutex_unlock(&data->thermal_lock);
187
188 dev_dbg(&data->pdev->dev, "id=%d, irq=%d, temp=%d, thres=%d\n",
189 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
209 static struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
210 .get_temp = hisi_thermal_get_temp,
211 };
212
213 static 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
223 static 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
236 for (i = 0; i < HISI_MAX_SENSORS; i++) {
237 if (!data->sensors[i].tzd)
238 continue;
239
240 thermal_zone_device_update(data->sensors[i].tzd,
241 THERMAL_EVENT_UNSPECIFIED);
242 }
243
244 return IRQ_HANDLED;
245 }
246
247 static int hisi_thermal_register_sensor(struct platform_device *pdev,
248 struct hisi_thermal_data *data,
249 struct hisi_thermal_sensor *sensor,
250 int index)
251 {
252 int ret, i;
253 const struct thermal_trip *trip;
254
255 sensor->id = index;
256 sensor->thermal = data;
257
258 sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev,
259 sensor->id, sensor, &hisi_of_thermal_ops);
260 if (IS_ERR(sensor->tzd)) {
261 ret = PTR_ERR(sensor->tzd);
262 sensor->tzd = NULL;
263 dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
264 sensor->id, ret);
265 return ret;
266 }
267
268 trip = of_thermal_get_trip_points(sensor->tzd);
269
270 for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
271 if (trip[i].type == THERMAL_TRIP_PASSIVE) {
272 sensor->thres_temp = trip[i].temperature;
273 break;
274 }
275 }
276
277 return 0;
278 }
279
280 static const struct of_device_id of_hisi_thermal_match[] = {
281 { .compatible = "hisilicon,tsensor" },
282 { /* end */ }
283 };
284 MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);
285
286 static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
287 bool on)
288 {
289 struct thermal_zone_device *tzd = sensor->tzd;
290
291 tzd->ops->set_mode(tzd,
292 on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
293 }
294
295 static int hisi_thermal_probe(struct platform_device *pdev)
296 {
297 struct hisi_thermal_data *data;
298 struct resource *res;
299 int i;
300 int ret;
301
302 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
303 if (!data)
304 return -ENOMEM;
305
306 mutex_init(&data->thermal_lock);
307 data->pdev = pdev;
308
309 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
310 data->regs = devm_ioremap_resource(&pdev->dev, res);
311 if (IS_ERR(data->regs)) {
312 dev_err(&pdev->dev, "failed to get io address\n");
313 return PTR_ERR(data->regs);
314 }
315
316 data->irq = platform_get_irq(pdev, 0);
317 if (data->irq < 0)
318 return data->irq;
319
320 ret = devm_request_threaded_irq(&pdev->dev, data->irq,
321 hisi_thermal_alarm_irq,
322 hisi_thermal_alarm_irq_thread,
323 0, "hisi_thermal", data);
324 if (ret < 0) {
325 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
326 return ret;
327 }
328
329 platform_set_drvdata(pdev, data);
330
331 data->clk = devm_clk_get(&pdev->dev, "thermal_clk");
332 if (IS_ERR(data->clk)) {
333 ret = PTR_ERR(data->clk);
334 if (ret != -EPROBE_DEFER)
335 dev_err(&pdev->dev,
336 "failed to get thermal clk: %d\n", ret);
337 return ret;
338 }
339
340 /* enable clock for thermal */
341 ret = clk_prepare_enable(data->clk);
342 if (ret) {
343 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
344 return ret;
345 }
346
347 hisi_thermal_enable_bind_irq_sensor(data);
348 irq_get_irqchip_state(data->irq, IRQCHIP_STATE_MASKED,
349 &data->irq_enabled);
350
351 for (i = 0; i < HISI_MAX_SENSORS; ++i) {
352 ret = hisi_thermal_register_sensor(pdev, data,
353 &data->sensors[i], i);
354 if (ret)
355 dev_err(&pdev->dev,
356 "failed to register thermal sensor: %d\n", ret);
357 else
358 hisi_thermal_toggle_sensor(&data->sensors[i], true);
359 }
360
361 return 0;
362 }
363
364 static int hisi_thermal_remove(struct platform_device *pdev)
365 {
366 struct hisi_thermal_data *data = platform_get_drvdata(pdev);
367 int i;
368
369 for (i = 0; i < HISI_MAX_SENSORS; i++) {
370 struct hisi_thermal_sensor *sensor = &data->sensors[i];
371
372 if (!sensor->tzd)
373 continue;
374
375 hisi_thermal_toggle_sensor(sensor, false);
376 }
377
378 hisi_thermal_disable_sensor(data);
379 clk_disable_unprepare(data->clk);
380
381 return 0;
382 }
383
384 #ifdef CONFIG_PM_SLEEP
385 static int hisi_thermal_suspend(struct device *dev)
386 {
387 struct hisi_thermal_data *data = dev_get_drvdata(dev);
388
389 hisi_thermal_disable_sensor(data);
390 data->irq_enabled = false;
391
392 clk_disable_unprepare(data->clk);
393
394 return 0;
395 }
396
397 static int hisi_thermal_resume(struct device *dev)
398 {
399 struct hisi_thermal_data *data = dev_get_drvdata(dev);
400
401 clk_prepare_enable(data->clk);
402
403 data->irq_enabled = true;
404 hisi_thermal_enable_bind_irq_sensor(data);
405
406 return 0;
407 }
408 #endif
409
410 static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
411 hisi_thermal_suspend, hisi_thermal_resume);
412
413 static struct platform_driver hisi_thermal_driver = {
414 .driver = {
415 .name = "hisi_thermal",
416 .pm = &hisi_thermal_pm_ops,
417 .of_match_table = of_hisi_thermal_match,
418 },
419 .probe = hisi_thermal_probe,
420 .remove = hisi_thermal_remove,
421 };
422
423 module_platform_driver(hisi_thermal_driver);
424
425 MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
426 MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
427 MODULE_DESCRIPTION("Hisilicon thermal driver");
428 MODULE_LICENSE("GPL v2");
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