Commit | Line | Data |
---|---|---|
ca3de46b SG |
1 | /* |
2 | * Copyright 2013 Freescale Semiconductor, Inc. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | */ | |
9 | ||
329fe7b1 | 10 | #include <linux/clk.h> |
ca3de46b SG |
11 | #include <linux/cpu_cooling.h> |
12 | #include <linux/cpufreq.h> | |
13 | #include <linux/delay.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/init.h> | |
37713a1e | 16 | #include <linux/interrupt.h> |
ca3de46b SG |
17 | #include <linux/io.h> |
18 | #include <linux/kernel.h> | |
19 | #include <linux/mfd/syscon.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/of.h> | |
22 | #include <linux/platform_device.h> | |
23 | #include <linux/regmap.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/thermal.h> | |
26 | #include <linux/types.h> | |
27 | ||
28 | #define REG_SET 0x4 | |
29 | #define REG_CLR 0x8 | |
30 | #define REG_TOG 0xc | |
31 | ||
32 | #define MISC0 0x0150 | |
33 | #define MISC0_REFTOP_SELBIASOFF (1 << 3) | |
34 | ||
35 | #define TEMPSENSE0 0x0180 | |
37713a1e PZ |
36 | #define TEMPSENSE0_ALARM_VALUE_SHIFT 20 |
37 | #define TEMPSENSE0_ALARM_VALUE_MASK (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT) | |
ca3de46b SG |
38 | #define TEMPSENSE0_TEMP_CNT_SHIFT 8 |
39 | #define TEMPSENSE0_TEMP_CNT_MASK (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT) | |
40 | #define TEMPSENSE0_FINISHED (1 << 2) | |
41 | #define TEMPSENSE0_MEASURE_TEMP (1 << 1) | |
42 | #define TEMPSENSE0_POWER_DOWN (1 << 0) | |
43 | ||
44 | #define TEMPSENSE1 0x0190 | |
45 | #define TEMPSENSE1_MEASURE_FREQ 0xffff | |
46 | ||
47 | #define OCOTP_ANA1 0x04e0 | |
48 | ||
49 | /* The driver supports 1 passive trip point and 1 critical trip point */ | |
50 | enum imx_thermal_trip { | |
51 | IMX_TRIP_PASSIVE, | |
52 | IMX_TRIP_CRITICAL, | |
53 | IMX_TRIP_NUM, | |
54 | }; | |
55 | ||
56 | /* | |
57 | * It defines the temperature in millicelsius for passive trip point | |
58 | * that will trigger cooling action when crossed. | |
59 | */ | |
60 | #define IMX_TEMP_PASSIVE 85000 | |
61 | ||
ca3de46b SG |
62 | #define IMX_POLLING_DELAY 2000 /* millisecond */ |
63 | #define IMX_PASSIVE_DELAY 1000 | |
64 | ||
749e8be7 AH |
65 | #define FACTOR0 10000000 |
66 | #define FACTOR1 15976 | |
67 | #define FACTOR2 4297157 | |
68 | ||
ca3de46b SG |
69 | struct imx_thermal_data { |
70 | struct thermal_zone_device *tz; | |
71 | struct thermal_cooling_device *cdev; | |
72 | enum thermal_device_mode mode; | |
73 | struct regmap *tempmon; | |
749e8be7 | 74 | u32 c1, c2; /* See formula in imx_get_sensor_data() */ |
017e5142 PZ |
75 | unsigned long temp_passive; |
76 | unsigned long temp_critical; | |
37713a1e PZ |
77 | unsigned long alarm_temp; |
78 | unsigned long last_temp; | |
79 | bool irq_enabled; | |
80 | int irq; | |
329fe7b1 | 81 | struct clk *thermal_clk; |
ca3de46b SG |
82 | }; |
83 | ||
37713a1e PZ |
84 | static void imx_set_alarm_temp(struct imx_thermal_data *data, |
85 | signed long alarm_temp) | |
86 | { | |
87 | struct regmap *map = data->tempmon; | |
88 | int alarm_value; | |
89 | ||
90 | data->alarm_temp = alarm_temp; | |
749e8be7 | 91 | alarm_value = (data->c2 - alarm_temp) / data->c1; |
37713a1e PZ |
92 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK); |
93 | regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value << | |
94 | TEMPSENSE0_ALARM_VALUE_SHIFT); | |
95 | } | |
96 | ||
ca3de46b SG |
97 | static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp) |
98 | { | |
99 | struct imx_thermal_data *data = tz->devdata; | |
100 | struct regmap *map = data->tempmon; | |
ca3de46b | 101 | unsigned int n_meas; |
37713a1e | 102 | bool wait; |
ca3de46b SG |
103 | u32 val; |
104 | ||
37713a1e PZ |
105 | if (data->mode == THERMAL_DEVICE_ENABLED) { |
106 | /* Check if a measurement is currently in progress */ | |
107 | regmap_read(map, TEMPSENSE0, &val); | |
108 | wait = !(val & TEMPSENSE0_FINISHED); | |
109 | } else { | |
110 | /* | |
111 | * Every time we measure the temperature, we will power on the | |
112 | * temperature sensor, enable measurements, take a reading, | |
113 | * disable measurements, power off the temperature sensor. | |
114 | */ | |
115 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
116 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
117 | ||
118 | wait = true; | |
119 | } | |
ca3de46b SG |
120 | |
121 | /* | |
122 | * According to the temp sensor designers, it may require up to ~17us | |
123 | * to complete a measurement. | |
124 | */ | |
37713a1e PZ |
125 | if (wait) |
126 | usleep_range(20, 50); | |
ca3de46b SG |
127 | |
128 | regmap_read(map, TEMPSENSE0, &val); | |
37713a1e PZ |
129 | |
130 | if (data->mode != THERMAL_DEVICE_ENABLED) { | |
131 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); | |
132 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
133 | } | |
ca3de46b SG |
134 | |
135 | if ((val & TEMPSENSE0_FINISHED) == 0) { | |
136 | dev_dbg(&tz->device, "temp measurement never finished\n"); | |
137 | return -EAGAIN; | |
138 | } | |
139 | ||
140 | n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT; | |
141 | ||
142 | /* See imx_get_sensor_data() for formula derivation */ | |
749e8be7 | 143 | *temp = data->c2 - n_meas * data->c1; |
ca3de46b | 144 | |
37713a1e PZ |
145 | /* Update alarm value to next higher trip point */ |
146 | if (data->alarm_temp == data->temp_passive && *temp >= data->temp_passive) | |
147 | imx_set_alarm_temp(data, data->temp_critical); | |
148 | if (data->alarm_temp == data->temp_critical && *temp < data->temp_passive) { | |
149 | imx_set_alarm_temp(data, data->temp_passive); | |
150 | dev_dbg(&tz->device, "thermal alarm off: T < %lu\n", | |
151 | data->alarm_temp / 1000); | |
152 | } | |
153 | ||
154 | if (*temp != data->last_temp) { | |
ca3de46b | 155 | dev_dbg(&tz->device, "millicelsius: %ld\n", *temp); |
37713a1e PZ |
156 | data->last_temp = *temp; |
157 | } | |
158 | ||
159 | /* Reenable alarm IRQ if temperature below alarm temperature */ | |
160 | if (!data->irq_enabled && *temp < data->alarm_temp) { | |
161 | data->irq_enabled = true; | |
162 | enable_irq(data->irq); | |
ca3de46b SG |
163 | } |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | static int imx_get_mode(struct thermal_zone_device *tz, | |
169 | enum thermal_device_mode *mode) | |
170 | { | |
171 | struct imx_thermal_data *data = tz->devdata; | |
172 | ||
173 | *mode = data->mode; | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
178 | static int imx_set_mode(struct thermal_zone_device *tz, | |
179 | enum thermal_device_mode mode) | |
180 | { | |
181 | struct imx_thermal_data *data = tz->devdata; | |
37713a1e | 182 | struct regmap *map = data->tempmon; |
ca3de46b SG |
183 | |
184 | if (mode == THERMAL_DEVICE_ENABLED) { | |
185 | tz->polling_delay = IMX_POLLING_DELAY; | |
186 | tz->passive_delay = IMX_PASSIVE_DELAY; | |
37713a1e PZ |
187 | |
188 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
189 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
190 | ||
191 | if (!data->irq_enabled) { | |
192 | data->irq_enabled = true; | |
193 | enable_irq(data->irq); | |
194 | } | |
ca3de46b | 195 | } else { |
37713a1e PZ |
196 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); |
197 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
198 | ||
ca3de46b SG |
199 | tz->polling_delay = 0; |
200 | tz->passive_delay = 0; | |
37713a1e PZ |
201 | |
202 | if (data->irq_enabled) { | |
203 | disable_irq(data->irq); | |
204 | data->irq_enabled = false; | |
205 | } | |
ca3de46b SG |
206 | } |
207 | ||
208 | data->mode = mode; | |
209 | thermal_zone_device_update(tz); | |
210 | ||
211 | return 0; | |
212 | } | |
213 | ||
214 | static int imx_get_trip_type(struct thermal_zone_device *tz, int trip, | |
215 | enum thermal_trip_type *type) | |
216 | { | |
217 | *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE : | |
218 | THERMAL_TRIP_CRITICAL; | |
219 | return 0; | |
220 | } | |
221 | ||
222 | static int imx_get_crit_temp(struct thermal_zone_device *tz, | |
223 | unsigned long *temp) | |
224 | { | |
017e5142 PZ |
225 | struct imx_thermal_data *data = tz->devdata; |
226 | ||
227 | *temp = data->temp_critical; | |
ca3de46b SG |
228 | return 0; |
229 | } | |
230 | ||
231 | static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip, | |
232 | unsigned long *temp) | |
233 | { | |
017e5142 PZ |
234 | struct imx_thermal_data *data = tz->devdata; |
235 | ||
236 | *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive : | |
237 | data->temp_critical; | |
238 | return 0; | |
239 | } | |
240 | ||
241 | static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip, | |
242 | unsigned long temp) | |
243 | { | |
244 | struct imx_thermal_data *data = tz->devdata; | |
245 | ||
246 | if (trip == IMX_TRIP_CRITICAL) | |
247 | return -EPERM; | |
248 | ||
249 | if (temp > IMX_TEMP_PASSIVE) | |
250 | return -EINVAL; | |
251 | ||
252 | data->temp_passive = temp; | |
253 | ||
37713a1e PZ |
254 | imx_set_alarm_temp(data, temp); |
255 | ||
ca3de46b SG |
256 | return 0; |
257 | } | |
258 | ||
259 | static int imx_bind(struct thermal_zone_device *tz, | |
260 | struct thermal_cooling_device *cdev) | |
261 | { | |
262 | int ret; | |
263 | ||
264 | ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev, | |
265 | THERMAL_NO_LIMIT, | |
266 | THERMAL_NO_LIMIT); | |
267 | if (ret) { | |
268 | dev_err(&tz->device, | |
269 | "binding zone %s with cdev %s failed:%d\n", | |
270 | tz->type, cdev->type, ret); | |
271 | return ret; | |
272 | } | |
273 | ||
274 | return 0; | |
275 | } | |
276 | ||
277 | static int imx_unbind(struct thermal_zone_device *tz, | |
278 | struct thermal_cooling_device *cdev) | |
279 | { | |
280 | int ret; | |
281 | ||
282 | ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev); | |
283 | if (ret) { | |
284 | dev_err(&tz->device, | |
285 | "unbinding zone %s with cdev %s failed:%d\n", | |
286 | tz->type, cdev->type, ret); | |
287 | return ret; | |
288 | } | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
cbb07bb3 | 293 | static struct thermal_zone_device_ops imx_tz_ops = { |
ca3de46b SG |
294 | .bind = imx_bind, |
295 | .unbind = imx_unbind, | |
296 | .get_temp = imx_get_temp, | |
297 | .get_mode = imx_get_mode, | |
298 | .set_mode = imx_set_mode, | |
299 | .get_trip_type = imx_get_trip_type, | |
300 | .get_trip_temp = imx_get_trip_temp, | |
301 | .get_crit_temp = imx_get_crit_temp, | |
017e5142 | 302 | .set_trip_temp = imx_set_trip_temp, |
ca3de46b SG |
303 | }; |
304 | ||
305 | static int imx_get_sensor_data(struct platform_device *pdev) | |
306 | { | |
307 | struct imx_thermal_data *data = platform_get_drvdata(pdev); | |
308 | struct regmap *map; | |
d0f9d64a | 309 | int t1, n1; |
ca3de46b SG |
310 | int ret; |
311 | u32 val; | |
749e8be7 | 312 | u64 temp64; |
ca3de46b SG |
313 | |
314 | map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, | |
315 | "fsl,tempmon-data"); | |
316 | if (IS_ERR(map)) { | |
317 | ret = PTR_ERR(map); | |
318 | dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret); | |
319 | return ret; | |
320 | } | |
321 | ||
322 | ret = regmap_read(map, OCOTP_ANA1, &val); | |
323 | if (ret) { | |
324 | dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret); | |
325 | return ret; | |
326 | } | |
327 | ||
328 | if (val == 0 || val == ~0) { | |
329 | dev_err(&pdev->dev, "invalid sensor calibration data\n"); | |
330 | return -EINVAL; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Sensor data layout: | |
335 | * [31:20] - sensor value @ 25C | |
749e8be7 AH |
336 | * Use universal formula now and only need sensor value @ 25C |
337 | * slope = 0.4297157 - (0.0015976 * 25C fuse) | |
ca3de46b SG |
338 | */ |
339 | n1 = val >> 20; | |
ca3de46b SG |
340 | t1 = 25; /* t1 always 25C */ |
341 | ||
342 | /* | |
749e8be7 AH |
343 | * Derived from linear interpolation: |
344 | * slope = 0.4297157 - (0.0015976 * 25C fuse) | |
345 | * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0 | |
346 | * (Nmeas - n1) / (Tmeas - t1) = slope | |
ca3de46b SG |
347 | * We want to reduce this down to the minimum computation necessary |
348 | * for each temperature read. Also, we want Tmeas in millicelsius | |
349 | * and we don't want to lose precision from integer division. So... | |
749e8be7 AH |
350 | * Tmeas = (Nmeas - n1) / slope + t1 |
351 | * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1 | |
352 | * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1 | |
353 | * Let constant c1 = (-1000 / slope) | |
354 | * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1 | |
355 | * Let constant c2 = n1 *c1 + 1000 * t1 | |
356 | * milli_Tmeas = c2 - Nmeas * c1 | |
ca3de46b | 357 | */ |
749e8be7 AH |
358 | temp64 = FACTOR0; |
359 | temp64 *= 1000; | |
360 | do_div(temp64, FACTOR1 * n1 - FACTOR2); | |
361 | data->c1 = temp64; | |
362 | data->c2 = n1 * data->c1 + 1000 * t1; | |
ca3de46b | 363 | |
017e5142 | 364 | /* |
d0f9d64a AH |
365 | * Set the default passive cooling trip point, |
366 | * can be changed from userspace. | |
017e5142 | 367 | */ |
d0f9d64a | 368 | data->temp_passive = IMX_TEMP_PASSIVE; |
017e5142 PZ |
369 | |
370 | /* | |
d0f9d64a AH |
371 | * The maximum die temperature set to 20 C higher than |
372 | * IMX_TEMP_PASSIVE. | |
017e5142 | 373 | */ |
d0f9d64a | 374 | data->temp_critical = 1000 * 20 + data->temp_passive; |
017e5142 | 375 | |
ca3de46b SG |
376 | return 0; |
377 | } | |
378 | ||
37713a1e PZ |
379 | static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev) |
380 | { | |
381 | struct imx_thermal_data *data = dev; | |
382 | ||
383 | disable_irq_nosync(irq); | |
384 | data->irq_enabled = false; | |
385 | ||
386 | return IRQ_WAKE_THREAD; | |
387 | } | |
388 | ||
389 | static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev) | |
390 | { | |
391 | struct imx_thermal_data *data = dev; | |
392 | ||
393 | dev_dbg(&data->tz->device, "THERMAL ALARM: T > %lu\n", | |
394 | data->alarm_temp / 1000); | |
395 | ||
396 | thermal_zone_device_update(data->tz); | |
397 | ||
398 | return IRQ_HANDLED; | |
399 | } | |
400 | ||
ca3de46b SG |
401 | static int imx_thermal_probe(struct platform_device *pdev) |
402 | { | |
403 | struct imx_thermal_data *data; | |
404 | struct cpumask clip_cpus; | |
405 | struct regmap *map; | |
37713a1e | 406 | int measure_freq; |
ca3de46b SG |
407 | int ret; |
408 | ||
409 | data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL); | |
410 | if (!data) | |
411 | return -ENOMEM; | |
412 | ||
413 | map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon"); | |
414 | if (IS_ERR(map)) { | |
415 | ret = PTR_ERR(map); | |
416 | dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret); | |
417 | return ret; | |
418 | } | |
419 | data->tempmon = map; | |
420 | ||
37713a1e PZ |
421 | data->irq = platform_get_irq(pdev, 0); |
422 | if (data->irq < 0) | |
423 | return data->irq; | |
424 | ||
425 | ret = devm_request_threaded_irq(&pdev->dev, data->irq, | |
426 | imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread, | |
427 | 0, "imx_thermal", data); | |
428 | if (ret < 0) { | |
429 | dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret); | |
430 | return ret; | |
431 | } | |
432 | ||
ca3de46b SG |
433 | platform_set_drvdata(pdev, data); |
434 | ||
435 | ret = imx_get_sensor_data(pdev); | |
436 | if (ret) { | |
437 | dev_err(&pdev->dev, "failed to get sensor data\n"); | |
438 | return ret; | |
439 | } | |
440 | ||
441 | /* Make sure sensor is in known good state for measurements */ | |
442 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
443 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); | |
444 | regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ); | |
445 | regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF); | |
446 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
447 | ||
448 | cpumask_set_cpu(0, &clip_cpus); | |
449 | data->cdev = cpufreq_cooling_register(&clip_cpus); | |
450 | if (IS_ERR(data->cdev)) { | |
451 | ret = PTR_ERR(data->cdev); | |
452 | dev_err(&pdev->dev, | |
453 | "failed to register cpufreq cooling device: %d\n", ret); | |
454 | return ret; | |
455 | } | |
456 | ||
457 | data->tz = thermal_zone_device_register("imx_thermal_zone", | |
017e5142 PZ |
458 | IMX_TRIP_NUM, |
459 | BIT(IMX_TRIP_PASSIVE), data, | |
ca3de46b SG |
460 | &imx_tz_ops, NULL, |
461 | IMX_PASSIVE_DELAY, | |
462 | IMX_POLLING_DELAY); | |
463 | if (IS_ERR(data->tz)) { | |
464 | ret = PTR_ERR(data->tz); | |
465 | dev_err(&pdev->dev, | |
466 | "failed to register thermal zone device %d\n", ret); | |
467 | cpufreq_cooling_unregister(data->cdev); | |
468 | return ret; | |
469 | } | |
470 | ||
329fe7b1 AH |
471 | data->thermal_clk = devm_clk_get(&pdev->dev, NULL); |
472 | if (IS_ERR(data->thermal_clk)) { | |
473 | dev_warn(&pdev->dev, "failed to get thermal clk!\n"); | |
474 | } else { | |
475 | /* | |
476 | * Thermal sensor needs clk on to get correct value, normally | |
477 | * we should enable its clk before taking measurement and disable | |
478 | * clk after measurement is done, but if alarm function is enabled, | |
479 | * hardware will auto measure the temperature periodically, so we | |
480 | * need to keep the clk always on for alarm function. | |
481 | */ | |
482 | ret = clk_prepare_enable(data->thermal_clk); | |
483 | if (ret) | |
484 | dev_warn(&pdev->dev, "failed to enable thermal clk: %d\n", ret); | |
485 | } | |
486 | ||
37713a1e PZ |
487 | /* Enable measurements at ~ 10 Hz */ |
488 | regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ); | |
489 | measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */ | |
490 | regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq); | |
491 | imx_set_alarm_temp(data, data->temp_passive); | |
492 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
493 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
494 | ||
495 | data->irq_enabled = true; | |
ca3de46b SG |
496 | data->mode = THERMAL_DEVICE_ENABLED; |
497 | ||
498 | return 0; | |
499 | } | |
500 | ||
501 | static int imx_thermal_remove(struct platform_device *pdev) | |
502 | { | |
503 | struct imx_thermal_data *data = platform_get_drvdata(pdev); | |
37713a1e PZ |
504 | struct regmap *map = data->tempmon; |
505 | ||
506 | /* Disable measurements */ | |
507 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
329fe7b1 AH |
508 | if (!IS_ERR(data->thermal_clk)) |
509 | clk_disable_unprepare(data->thermal_clk); | |
ca3de46b SG |
510 | |
511 | thermal_zone_device_unregister(data->tz); | |
512 | cpufreq_cooling_unregister(data->cdev); | |
513 | ||
514 | return 0; | |
515 | } | |
516 | ||
517 | #ifdef CONFIG_PM_SLEEP | |
518 | static int imx_thermal_suspend(struct device *dev) | |
519 | { | |
520 | struct imx_thermal_data *data = dev_get_drvdata(dev); | |
521 | struct regmap *map = data->tempmon; | |
ca3de46b | 522 | |
b46cce59 AH |
523 | /* |
524 | * Need to disable thermal sensor, otherwise, when thermal core | |
525 | * try to get temperature before thermal sensor resume, a wrong | |
526 | * temperature will be read as the thermal sensor is powered | |
527 | * down. | |
528 | */ | |
529 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP); | |
530 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN); | |
531 | data->mode = THERMAL_DEVICE_DISABLED; | |
ca3de46b SG |
532 | |
533 | return 0; | |
534 | } | |
535 | ||
536 | static int imx_thermal_resume(struct device *dev) | |
537 | { | |
b46cce59 AH |
538 | struct imx_thermal_data *data = dev_get_drvdata(dev); |
539 | struct regmap *map = data->tempmon; | |
540 | ||
541 | /* Enabled thermal sensor after resume */ | |
542 | regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); | |
543 | regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); | |
544 | data->mode = THERMAL_DEVICE_ENABLED; | |
545 | ||
ca3de46b SG |
546 | return 0; |
547 | } | |
548 | #endif | |
549 | ||
550 | static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops, | |
551 | imx_thermal_suspend, imx_thermal_resume); | |
552 | ||
553 | static const struct of_device_id of_imx_thermal_match[] = { | |
554 | { .compatible = "fsl,imx6q-tempmon", }, | |
555 | { /* end */ } | |
556 | }; | |
dd268632 | 557 | MODULE_DEVICE_TABLE(of, of_imx_thermal_match); |
ca3de46b SG |
558 | |
559 | static struct platform_driver imx_thermal = { | |
560 | .driver = { | |
561 | .name = "imx_thermal", | |
562 | .owner = THIS_MODULE, | |
563 | .pm = &imx_thermal_pm_ops, | |
564 | .of_match_table = of_imx_thermal_match, | |
565 | }, | |
566 | .probe = imx_thermal_probe, | |
567 | .remove = imx_thermal_remove, | |
568 | }; | |
569 | module_platform_driver(imx_thermal); | |
570 | ||
571 | MODULE_AUTHOR("Freescale Semiconductor, Inc."); | |
572 | MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs"); | |
573 | MODULE_LICENSE("GPL v2"); | |
574 | MODULE_ALIAS("platform:imx-thermal"); |