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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 | */ | |
5fdfc48b | 71 | return (HISI_TEMP_BASE * 1000 + (step * 200000 / 255)); |
9a5238a9 | 72 | } |
73 | ||
74 | static inline long _temp_to_step(long temp) | |
75 | { | |
5fdfc48b | 76 | return ((temp - HISI_TEMP_BASE * 1000) * 255) / 200000; |
9a5238a9 | 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 | ||
17e8351a | 158 | static int hisi_thermal_get_temp(void *_sensor, int *temp) |
9a5238a9 | 159 | { |
160 | struct hisi_thermal_sensor *sensor = _sensor; | |
161 | struct hisi_thermal_data *data = sensor->thermal; | |
162 | ||
439dc968 | 163 | int sensor_id = -1, i; |
9a5238a9 | 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++) { | |
439dc968 LY |
171 | if (!data->sensors[i].tzd) |
172 | continue; | |
173 | ||
9a5238a9 | 174 | if (data->sensors[i].sensor_temp >= max_temp) { |
175 | max_temp = data->sensors[i].sensor_temp; | |
176 | sensor_id = i; | |
177 | } | |
178 | } | |
179 | ||
439dc968 LY |
180 | /* If no sensor has been enabled, then skip to enable irq */ |
181 | if (sensor_id == -1) | |
182 | return 0; | |
183 | ||
9a5238a9 | 184 | mutex_lock(&data->thermal_lock); |
185 | data->irq_bind_sensor = sensor_id; | |
186 | mutex_unlock(&data->thermal_lock); | |
187 | ||
17e8351a | 188 | dev_dbg(&data->pdev->dev, "id=%d, irq=%d, temp=%d, thres=%d\n", |
9a5238a9 | 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 | ||
439dc968 LY |
236 | for (i = 0; i < HISI_MAX_SENSORS; i++) { |
237 | if (!data->sensors[i].tzd) | |
238 | continue; | |
239 | ||
9a5238a9 | 240 | thermal_zone_device_update(data->sensors[i].tzd); |
439dc968 | 241 | } |
9a5238a9 | 242 | |
243 | return IRQ_HANDLED; | |
244 | } | |
245 | ||
246 | static 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 | ||
44a520d8 EV |
257 | sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, |
258 | sensor->id, sensor, &hisi_of_thermal_ops); | |
9a5238a9 | 259 | if (IS_ERR(sensor->tzd)) { |
260 | ret = PTR_ERR(sensor->tzd); | |
439dc968 | 261 | sensor->tzd = NULL; |
9a5238a9 | 262 | 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 | ||
279 | static const struct of_device_id of_hisi_thermal_match[] = { | |
280 | { .compatible = "hisilicon,tsensor" }, | |
281 | { /* end */ } | |
282 | }; | |
283 | MODULE_DEVICE_TABLE(of, of_hisi_thermal_match); | |
284 | ||
285 | static 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 | ||
294 | static 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 | ||
469ace07 LY |
346 | hisi_thermal_enable_bind_irq_sensor(data); |
347 | irq_get_irqchip_state(data->irq, IRQCHIP_STATE_MASKED, | |
348 | &data->irq_enabled); | |
349 | ||
9a5238a9 | 350 | for (i = 0; i < HISI_MAX_SENSORS; ++i) { |
351 | ret = hisi_thermal_register_sensor(pdev, data, | |
352 | &data->sensors[i], i); | |
439dc968 | 353 | if (ret) |
9a5238a9 | 354 | dev_err(&pdev->dev, |
355 | "failed to register thermal sensor: %d\n", ret); | |
439dc968 LY |
356 | else |
357 | hisi_thermal_toggle_sensor(&data->sensors[i], true); | |
9a5238a9 | 358 | } |
359 | ||
9a5238a9 | 360 | return 0; |
9a5238a9 | 361 | } |
362 | ||
363 | static 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 | ||
439dc968 LY |
371 | if (!sensor->tzd) |
372 | continue; | |
373 | ||
9a5238a9 | 374 | hisi_thermal_toggle_sensor(sensor, false); |
9a5238a9 | 375 | } |
376 | ||
377 | hisi_thermal_disable_sensor(data); | |
378 | clk_disable_unprepare(data->clk); | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | #ifdef CONFIG_PM_SLEEP | |
384 | static 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 | ||
396 | static 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 | ||
409 | static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops, | |
410 | hisi_thermal_suspend, hisi_thermal_resume); | |
411 | ||
412 | static struct platform_driver hisi_thermal_driver = { | |
413 | .driver = { | |
414 | .name = "hisi_thermal", | |
9a5238a9 | 415 | .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 | ||
422 | module_platform_driver(hisi_thermal_driver); | |
423 | ||
424 | MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>"); | |
425 | MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>"); | |
426 | MODULE_DESCRIPTION("Hisilicon thermal driver"); | |
427 | MODULE_LICENSE("GPL v2"); |