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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 | |
ff4ec299 | 42 | #define HISI_DEFAULT_SENSOR 2 |
9a5238a9 | 43 | |
44 | struct hisi_thermal_sensor { | |
45 | struct hisi_thermal_data *thermal; | |
46 | struct thermal_zone_device *tzd; | |
47 | ||
48 | long sensor_temp; | |
49 | uint32_t id; | |
50 | uint32_t thres_temp; | |
51 | }; | |
52 | ||
53 | struct hisi_thermal_data { | |
54 | struct mutex thermal_lock; /* protects register data */ | |
55 | struct platform_device *pdev; | |
56 | struct clk *clk; | |
ff4ec299 DL |
57 | struct hisi_thermal_sensor sensors; |
58 | int irq; | |
9a5238a9 | 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 | ||
ff4ec299 | 116 | sensor = &data->sensors; |
9a5238a9 | 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 | ||
9a5238a9 | 163 | *temp = hisi_thermal_get_sensor_temp(data, sensor); |
164 | ||
17e8351a | 165 | dev_dbg(&data->pdev->dev, "id=%d, irq=%d, temp=%d, thres=%d\n", |
9a5238a9 | 166 | sensor->id, data->irq_enabled, *temp, sensor->thres_temp); |
167 | /* | |
168 | * Bind irq to sensor for two cases: | |
169 | * Reenable alarm IRQ if temperature below threshold; | |
170 | * if irq has been enabled, always set it; | |
171 | */ | |
172 | if (data->irq_enabled) { | |
173 | hisi_thermal_enable_bind_irq_sensor(data); | |
174 | return 0; | |
175 | } | |
176 | ||
ff4ec299 | 177 | if (*temp < sensor->thres_temp) { |
9a5238a9 | 178 | data->irq_enabled = true; |
179 | hisi_thermal_enable_bind_irq_sensor(data); | |
180 | enable_irq(data->irq); | |
181 | } | |
182 | ||
183 | return 0; | |
184 | } | |
185 | ||
3fe156f1 | 186 | static const struct thermal_zone_of_device_ops hisi_of_thermal_ops = { |
9a5238a9 | 187 | .get_temp = hisi_thermal_get_temp, |
188 | }; | |
189 | ||
190 | static irqreturn_t hisi_thermal_alarm_irq(int irq, void *dev) | |
191 | { | |
192 | struct hisi_thermal_data *data = dev; | |
193 | ||
194 | disable_irq_nosync(irq); | |
195 | data->irq_enabled = false; | |
196 | ||
197 | return IRQ_WAKE_THREAD; | |
198 | } | |
199 | ||
200 | static irqreturn_t hisi_thermal_alarm_irq_thread(int irq, void *dev) | |
201 | { | |
202 | struct hisi_thermal_data *data = dev; | |
203 | struct hisi_thermal_sensor *sensor; | |
9a5238a9 | 204 | |
205 | mutex_lock(&data->thermal_lock); | |
ff4ec299 | 206 | sensor = &data->sensors; |
9a5238a9 | 207 | |
208 | dev_crit(&data->pdev->dev, "THERMAL ALARM: T > %d\n", | |
209 | sensor->thres_temp / 1000); | |
210 | mutex_unlock(&data->thermal_lock); | |
211 | ||
ff4ec299 DL |
212 | thermal_zone_device_update(data->sensors.tzd, |
213 | THERMAL_EVENT_UNSPECIFIED); | |
9a5238a9 | 214 | |
215 | return IRQ_HANDLED; | |
216 | } | |
217 | ||
218 | static int hisi_thermal_register_sensor(struct platform_device *pdev, | |
219 | struct hisi_thermal_data *data, | |
220 | struct hisi_thermal_sensor *sensor, | |
221 | int index) | |
222 | { | |
223 | int ret, i; | |
224 | const struct thermal_trip *trip; | |
225 | ||
226 | sensor->id = index; | |
227 | sensor->thermal = data; | |
228 | ||
44a520d8 EV |
229 | sensor->tzd = devm_thermal_zone_of_sensor_register(&pdev->dev, |
230 | sensor->id, sensor, &hisi_of_thermal_ops); | |
9a5238a9 | 231 | if (IS_ERR(sensor->tzd)) { |
232 | ret = PTR_ERR(sensor->tzd); | |
439dc968 | 233 | sensor->tzd = NULL; |
9a5238a9 | 234 | dev_err(&pdev->dev, "failed to register sensor id %d: %d\n", |
235 | sensor->id, ret); | |
236 | return ret; | |
237 | } | |
238 | ||
239 | trip = of_thermal_get_trip_points(sensor->tzd); | |
240 | ||
241 | for (i = 0; i < of_thermal_get_ntrips(sensor->tzd); i++) { | |
242 | if (trip[i].type == THERMAL_TRIP_PASSIVE) { | |
243 | sensor->thres_temp = trip[i].temperature; | |
244 | break; | |
245 | } | |
246 | } | |
247 | ||
248 | return 0; | |
249 | } | |
250 | ||
251 | static const struct of_device_id of_hisi_thermal_match[] = { | |
252 | { .compatible = "hisilicon,tsensor" }, | |
253 | { /* end */ } | |
254 | }; | |
255 | MODULE_DEVICE_TABLE(of, of_hisi_thermal_match); | |
256 | ||
257 | static void hisi_thermal_toggle_sensor(struct hisi_thermal_sensor *sensor, | |
258 | bool on) | |
259 | { | |
260 | struct thermal_zone_device *tzd = sensor->tzd; | |
261 | ||
262 | tzd->ops->set_mode(tzd, | |
263 | on ? THERMAL_DEVICE_ENABLED : THERMAL_DEVICE_DISABLED); | |
264 | } | |
265 | ||
266 | static int hisi_thermal_probe(struct platform_device *pdev) | |
267 | { | |
268 | struct hisi_thermal_data *data; | |
269 | struct resource *res; | |
9a5238a9 | 270 | int ret; |
271 | ||
272 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
273 | if (!data) | |
274 | return -ENOMEM; | |
275 | ||
276 | mutex_init(&data->thermal_lock); | |
277 | data->pdev = pdev; | |
278 | ||
279 | res = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
280 | data->regs = devm_ioremap_resource(&pdev->dev, res); | |
281 | if (IS_ERR(data->regs)) { | |
282 | dev_err(&pdev->dev, "failed to get io address\n"); | |
283 | return PTR_ERR(data->regs); | |
284 | } | |
285 | ||
286 | data->irq = platform_get_irq(pdev, 0); | |
287 | if (data->irq < 0) | |
288 | return data->irq; | |
289 | ||
9a5238a9 | 290 | platform_set_drvdata(pdev, data); |
291 | ||
292 | data->clk = devm_clk_get(&pdev->dev, "thermal_clk"); | |
293 | if (IS_ERR(data->clk)) { | |
294 | ret = PTR_ERR(data->clk); | |
295 | if (ret != -EPROBE_DEFER) | |
296 | dev_err(&pdev->dev, | |
297 | "failed to get thermal clk: %d\n", ret); | |
298 | return ret; | |
299 | } | |
300 | ||
301 | /* enable clock for thermal */ | |
302 | ret = clk_prepare_enable(data->clk); | |
303 | if (ret) { | |
304 | dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret); | |
305 | return ret; | |
306 | } | |
307 | ||
469ace07 | 308 | hisi_thermal_enable_bind_irq_sensor(data); |
c176b10b | 309 | data->irq_enabled = true; |
469ace07 | 310 | |
ff4ec299 DL |
311 | ret = hisi_thermal_register_sensor(pdev, data, |
312 | &data->sensors, | |
313 | HISI_DEFAULT_SENSOR); | |
314 | if (ret) { | |
315 | dev_err(&pdev->dev, "failed to register thermal sensor: %d\n", | |
316 | ret); | |
317 | return ret; | |
9a5238a9 | 318 | } |
319 | ||
ff4ec299 DL |
320 | hisi_thermal_toggle_sensor(&data->sensors, true); |
321 | ||
2cb4de78 DL |
322 | ret = devm_request_threaded_irq(&pdev->dev, data->irq, |
323 | hisi_thermal_alarm_irq, | |
324 | hisi_thermal_alarm_irq_thread, | |
325 | 0, "hisi_thermal", data); | |
326 | if (ret < 0) { | |
327 | dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); | |
328 | return ret; | |
329 | } | |
330 | ||
c176b10b DL |
331 | enable_irq(data->irq); |
332 | ||
9a5238a9 | 333 | return 0; |
9a5238a9 | 334 | } |
335 | ||
336 | static int hisi_thermal_remove(struct platform_device *pdev) | |
337 | { | |
338 | struct hisi_thermal_data *data = platform_get_drvdata(pdev); | |
ff4ec299 | 339 | struct hisi_thermal_sensor *sensor = &data->sensors; |
9a5238a9 | 340 | |
ff4ec299 | 341 | hisi_thermal_toggle_sensor(sensor, false); |
9a5238a9 | 342 | hisi_thermal_disable_sensor(data); |
343 | clk_disable_unprepare(data->clk); | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
348 | #ifdef CONFIG_PM_SLEEP | |
349 | static int hisi_thermal_suspend(struct device *dev) | |
350 | { | |
351 | struct hisi_thermal_data *data = dev_get_drvdata(dev); | |
352 | ||
353 | hisi_thermal_disable_sensor(data); | |
354 | data->irq_enabled = false; | |
355 | ||
356 | clk_disable_unprepare(data->clk); | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | static int hisi_thermal_resume(struct device *dev) | |
362 | { | |
363 | struct hisi_thermal_data *data = dev_get_drvdata(dev); | |
919054fd | 364 | int ret; |
9a5238a9 | 365 | |
919054fd AY |
366 | ret = clk_prepare_enable(data->clk); |
367 | if (ret) | |
368 | return ret; | |
9a5238a9 | 369 | |
370 | data->irq_enabled = true; | |
371 | hisi_thermal_enable_bind_irq_sensor(data); | |
372 | ||
373 | return 0; | |
374 | } | |
375 | #endif | |
376 | ||
377 | static SIMPLE_DEV_PM_OPS(hisi_thermal_pm_ops, | |
378 | hisi_thermal_suspend, hisi_thermal_resume); | |
379 | ||
380 | static struct platform_driver hisi_thermal_driver = { | |
381 | .driver = { | |
382 | .name = "hisi_thermal", | |
9a5238a9 | 383 | .pm = &hisi_thermal_pm_ops, |
384 | .of_match_table = of_hisi_thermal_match, | |
385 | }, | |
386 | .probe = hisi_thermal_probe, | |
387 | .remove = hisi_thermal_remove, | |
388 | }; | |
389 | ||
390 | module_platform_driver(hisi_thermal_driver); | |
391 | ||
392 | MODULE_AUTHOR("Xinwei Kong <kong.kongxinwei@hisilicon.com>"); | |
393 | MODULE_AUTHOR("Leo Yan <leo.yan@linaro.org>"); | |
394 | MODULE_DESCRIPTION("Hisilicon thermal driver"); | |
395 | MODULE_LICENSE("GPL v2"); |