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9a5238a9 | 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 + (step * 200 / 255)) * 1000; | |
72 | } | |
73 | ||
74 | static inline long _temp_to_step(long temp) | |
75 | { | |
76 | return ((temp / 1000 - HISI_TEMP_BASE) * 255 / 200); | |
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, 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 | ||
202 | static struct thermal_zone_of_device_ops hisi_of_thermal_ops = { | |
203 | .get_temp = hisi_thermal_get_temp, | |
204 | }; | |
205 | ||
206 | static 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 | ||
216 | static 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 | ||
235 | static 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 | ||
267 | static const struct of_device_id of_hisi_thermal_match[] = { | |
268 | { .compatible = "hisilicon,tsensor" }, | |
269 | { /* end */ } | |
270 | }; | |
271 | MODULE_DEVICE_TABLE(of, of_hisi_thermal_match); | |
272 | ||
273 | static 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 | ||
282 | static 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 | ||
352 | err_get_sensor_data: | |
353 | clk_disable_unprepare(data->clk); | |
354 | ||
355 | return ret; | |
356 | } | |
357 | ||
358 | static 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 | |
377 | static 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 | ||
389 | static 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 | ||
402 | static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops, | |
403 | hisi_thermal_suspend, hisi_thermal_resume); | |
404 | ||
405 | static struct platform_driver hisi_thermal_driver = { | |
406 | .driver = { | |
407 | .name = "hisi_thermal", | |
408 | .owner = THIS_MODULE, | |
409 | .pm = &hisi_thermal_pm_ops, | |
410 | .of_match_table = of_hisi_thermal_match, | |
411 | }, | |
412 | .probe = hisi_thermal_probe, | |
413 | .remove = hisi_thermal_remove, | |
414 | }; | |
415 | ||
416 | module_platform_driver(hisi_thermal_driver); | |
417 | ||
418 | MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>"); | |
419 | MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>"); | |
420 | MODULE_DESCRIPTION("Hisilicon thermal driver"); | |
421 | MODULE_LICENSE("GPL v2"); |