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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 */
71 return (HISI_TEMP_BASE + (step * 200 / 255)) * 1000;
72}
73
74static inline long _temp_to_step(long temp)
75{
76 return ((temp / 1000 - HISI_TEMP_BASE) * 255 / 200);
77}
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
158static int hisi_thermal_get_temp(void *_sensor, long *temp)
159{
160 struct hisi_thermal_sensor *sensor = _sensor;
161 struct hisi_thermal_data *data = sensor->thermal;
162
163 int sensor_id = 0, 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].sensor_temp >= max_temp) {
172 max_temp = data->sensors[i].sensor_temp;
173 sensor_id = i;
174 }
175 }
176
177 mutex_lock(&data->thermal_lock);
178 data->irq_bind_sensor = sensor_id;
179 mutex_unlock(&data->thermal_lock);
180
181 dev_dbg(&data->pdev->dev, "id=%d, irq=%d, temp=%ld, thres=%d\n",
182 sensor->id, data->irq_enabled, *temp, sensor->thres_temp);
183 /*
184 * Bind irq to sensor for two cases:
185 * Reenable alarm IRQ if temperature below threshold;
186 * if irq has been enabled, always set it;
187 */
188 if (data->irq_enabled) {
189 hisi_thermal_enable_bind_irq_sensor(data);
190 return 0;
191 }
192
193 if (max_temp < sensor->thres_temp) {
194 data->irq_enabled = true;
195 hisi_thermal_enable_bind_irq_sensor(data);
196 enable_irq(data->irq);
197 }
198
199 return 0;
200}
201
202static struct thermal_zone_of_device_ops hisi_of_thermal_ops = {
203 .get_temp = hisi_thermal_get_temp,
204};
205
206static irqreturn_t hisi_thermal_alarm_irq(int irq, void *dev)
207{
208 struct hisi_thermal_data *data = dev;
209
210 disable_irq_nosync(irq);
211 data->irq_enabled = false;
212
213 return IRQ_WAKE_THREAD;
214}
215
216static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev)
217{
218 struct hisi_thermal_data *data = dev;
219 struct hisi_thermal_sensor *sensor;
220 int i;
221
222 mutex_lock(&data->thermal_lock);
223 sensor = &data->sensors[data->irq_bind_sensor];
224
225 dev_crit(&data->pdev->dev, "THERMAL ALARM: T > %d\n",
226 sensor->thres_temp / 1000);
227 mutex_unlock(&data->thermal_lock);
228
229 for (i = 0; i < HISI_MAX_SENSORS; i++)
230 thermal_zone_device_update(data->sensors[i].tzd);
231
232 return IRQ_HANDLED;
233}
234
235static int hisi_thermal_register_sensor(struct platform_device *pdev,
236 struct hisi_thermal_data *data,
237 struct hisi_thermal_sensor *sensor,
238 int index)
239{
240 int ret, i;
241 const struct thermal_trip *trip;
242
243 sensor->id = index;
244 sensor->thermal = data;
245
246 sensor->tzd = thermal_zone_of_sensor_register(&pdev->dev, sensor->id,
247 sensor, &hisi_of_thermal_ops);
248 if (IS_ERR(sensor->tzd)) {
249 ret = PTR_ERR(sensor->tzd);
250 dev_err(&pdev->dev, "failed to register sensor id %d: %d\n",
251 sensor->id, ret);
252 return ret;
253 }
254
255 trip = of_thermal_get_trip_points(sensor->tzd);
256
257 for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) {
258 if (trip[i].type == THERMAL_TRIP_PASSIVE) {
259 sensor->thres_temp = trip[i].temperature;
260 break;
261 }
262 }
263
264 return 0;
265}
266
267static const struct of_device_id of_hisi_thermal_match[] = {
268 { .compatible = "hisilicon,tsensor" },
269 { /* end */ }
270};
271MODULE_DEVICE_TABLE(of, of_hisi_thermal_match);
272
273static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor,
274 bool on)
275{
276 struct thermal_zone_device *tzd = sensor->tzd;
277
278 tzd->ops->set_mode(tzd,
279 on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED);
280}
281
282static int hisi_thermal_probe(struct platform_device *pdev)
283{
284 struct hisi_thermal_data *data;
285 struct resource *res;
286 int i;
287 int ret;
288
289 data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
290 if (!data)
291 return -ENOMEM;
292
293 mutex_init(&data->thermal_lock);
294 data->pdev = pdev;
295
296 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
297 data->regs = devm_ioremap_resource(&pdev->dev, res);
298 if (IS_ERR(data->regs)) {
299 dev_err(&pdev->dev, "failed to get io address\n");
300 return PTR_ERR(data->regs);
301 }
302
303 data->irq = platform_get_irq(pdev, 0);
304 if (data->irq < 0)
305 return data->irq;
306
307 ret = devm_request_threaded_irq(&pdev->dev, data->irq,
308 hisi_thermal_alarm_irq,
309 hisi_thermal_alarm_irq_thread,
310 0, "hisi_thermal", data);
311 if (ret < 0) {
312 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
313 return ret;
314 }
315
316 platform_set_drvdata(pdev, data);
317
318 data->clk = devm_clk_get(&pdev->dev, "thermal_clk");
319 if (IS_ERR(data->clk)) {
320 ret = PTR_ERR(data->clk);
321 if (ret != -EPROBE_DEFER)
322 dev_err(&pdev->dev,
323 "failed to get thermal clk: %d\n", ret);
324 return ret;
325 }
326
327 /* enable clock for thermal */
328 ret = clk_prepare_enable(data->clk);
329 if (ret) {
330 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
331 return ret;
332 }
333
334 for (i = 0; i < HISI_MAX_SENSORS; ++i) {
335 ret = hisi_thermal_register_sensor(pdev, data,
336 &data->sensors[i], i);
337 if (ret) {
338 dev_err(&pdev->dev,
339 "failed to register thermal sensor: %d\n", ret);
340 goto err_get_sensor_data;
341 }
342 }
343
344 hisi_thermal_enable_bind_irq_sensor(data);
345 data->irq_enabled = true;
346
347 for (i = 0; i < HISI_MAX_SENSORS; i++)
348 hisi_thermal_toggle_sensor(&data->sensors[i], true);
349
350 return 0;
351
352err_get_sensor_data:
353 clk_disable_unprepare(data->clk);
354
355 return ret;
356}
357
358static int hisi_thermal_remove(struct platform_device *pdev)
359{
360 struct hisi_thermal_data *data = platform_get_drvdata(pdev);
361 int i;
362
363 for (i = 0; i < HISI_MAX_SENSORS; i++) {
364 struct hisi_thermal_sensor *sensor = &data->sensors[i];
365
366 hisi_thermal_toggle_sensor(sensor, false);
367 thermal_zone_of_sensor_unregister(&pdev->dev, sensor->tzd);
368 }
369
370 hisi_thermal_disable_sensor(data);
371 clk_disable_unprepare(data->clk);
372
373 return 0;
374}
375
376#ifdef CONFIG_PM_SLEEP
377static int hisi_thermal_suspend(struct device *dev)
378{
379 struct hisi_thermal_data *data = dev_get_drvdata(dev);
380
381 hisi_thermal_disable_sensor(data);
382 data->irq_enabled = false;
383
384 clk_disable_unprepare(data->clk);
385
386 return 0;
387}
388
389static int hisi_thermal_resume(struct device *dev)
390{
391 struct hisi_thermal_data *data = dev_get_drvdata(dev);
392
393 clk_prepare_enable(data->clk);
394
395 data->irq_enabled = true;
396 hisi_thermal_enable_bind_irq_sensor(data);
397
398 return 0;
399}
400#endif
401
402static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops,
403 hisi_thermal_suspend, hisi_thermal_resume);
404
405static struct platform_driver hisi_thermal_driver = {
406 .driver = {
407 .name = "hisi_thermal",
kongxinwei9a5238a2015-05-20 19:16:37 +0800408 .pm = &hisi_thermal_pm_ops,
409 .of_match_table = of_hisi_thermal_match,
410 },
411 .probe = hisi_thermal_probe,
412 .remove = hisi_thermal_remove,
413};
414
415module_platform_driver(hisi_thermal_driver);
416
417MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>");
418MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>");
419MODULE_DESCRIPTION("Hisilicon thermal driver");
420MODULE_LICENSE("GPL v2");