Version:  2.0.40 2.2.26 2.4.37 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18

Linux/drivers/thermal/imx_thermal.c

  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 
 10 #include <linux/clk.h>
 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>
 16 #include <linux/interrupt.h>
 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/of_device.h>
 23 #include <linux/platform_device.h>
 24 #include <linux/regmap.h>
 25 #include <linux/slab.h>
 26 #include <linux/thermal.h>
 27 #include <linux/types.h>
 28 
 29 #define REG_SET         0x4
 30 #define REG_CLR         0x8
 31 #define REG_TOG         0xc
 32 
 33 #define MISC0                           0x0150
 34 #define MISC0_REFTOP_SELBIASOFF         (1 << 3)
 35 #define MISC1                           0x0160
 36 #define MISC1_IRQ_TEMPHIGH              (1 << 29)
 37 /* Below LOW and PANIC bits are only for TEMPMON_IMX6SX */
 38 #define MISC1_IRQ_TEMPLOW               (1 << 28)
 39 #define MISC1_IRQ_TEMPPANIC             (1 << 27)
 40 
 41 #define TEMPSENSE0                      0x0180
 42 #define TEMPSENSE0_ALARM_VALUE_SHIFT    20
 43 #define TEMPSENSE0_ALARM_VALUE_MASK     (0xfff << TEMPSENSE0_ALARM_VALUE_SHIFT)
 44 #define TEMPSENSE0_TEMP_CNT_SHIFT       8
 45 #define TEMPSENSE0_TEMP_CNT_MASK        (0xfff << TEMPSENSE0_TEMP_CNT_SHIFT)
 46 #define TEMPSENSE0_FINISHED             (1 << 2)
 47 #define TEMPSENSE0_MEASURE_TEMP         (1 << 1)
 48 #define TEMPSENSE0_POWER_DOWN           (1 << 0)
 49 
 50 #define TEMPSENSE1                      0x0190
 51 #define TEMPSENSE1_MEASURE_FREQ         0xffff
 52 /* Below TEMPSENSE2 is only for TEMPMON_IMX6SX */
 53 #define TEMPSENSE2                      0x0290
 54 #define TEMPSENSE2_LOW_VALUE_SHIFT      0
 55 #define TEMPSENSE2_LOW_VALUE_MASK       0xfff
 56 #define TEMPSENSE2_PANIC_VALUE_SHIFT    16
 57 #define TEMPSENSE2_PANIC_VALUE_MASK     0xfff0000
 58 
 59 #define OCOTP_ANA1                      0x04e0
 60 
 61 /* The driver supports 1 passive trip point and 1 critical trip point */
 62 enum imx_thermal_trip {
 63         IMX_TRIP_PASSIVE,
 64         IMX_TRIP_CRITICAL,
 65         IMX_TRIP_NUM,
 66 };
 67 
 68 /*
 69  * It defines the temperature in millicelsius for passive trip point
 70  * that will trigger cooling action when crossed.
 71  */
 72 #define IMX_TEMP_PASSIVE                85000
 73 
 74 #define IMX_POLLING_DELAY               2000 /* millisecond */
 75 #define IMX_PASSIVE_DELAY               1000
 76 
 77 #define FACTOR0                         10000000
 78 #define FACTOR1                         15976
 79 #define FACTOR2                         4297157
 80 
 81 #define TEMPMON_IMX6Q                   1
 82 #define TEMPMON_IMX6SX                  2
 83 
 84 struct thermal_soc_data {
 85         u32 version;
 86 };
 87 
 88 static struct thermal_soc_data thermal_imx6q_data = {
 89         .version = TEMPMON_IMX6Q,
 90 };
 91 
 92 static struct thermal_soc_data thermal_imx6sx_data = {
 93         .version = TEMPMON_IMX6SX,
 94 };
 95 
 96 struct imx_thermal_data {
 97         struct thermal_zone_device *tz;
 98         struct thermal_cooling_device *cdev;
 99         enum thermal_device_mode mode;
100         struct regmap *tempmon;
101         u32 c1, c2; /* See formula in imx_get_sensor_data() */
102         unsigned long temp_passive;
103         unsigned long temp_critical;
104         unsigned long alarm_temp;
105         unsigned long last_temp;
106         bool irq_enabled;
107         int irq;
108         struct clk *thermal_clk;
109         const struct thermal_soc_data *socdata;
110 };
111 
112 static void imx_set_panic_temp(struct imx_thermal_data *data,
113                                signed long panic_temp)
114 {
115         struct regmap *map = data->tempmon;
116         int critical_value;
117 
118         critical_value = (data->c2 - panic_temp) / data->c1;
119         regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
120         regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
121                         TEMPSENSE2_PANIC_VALUE_SHIFT);
122 }
123 
124 static void imx_set_alarm_temp(struct imx_thermal_data *data,
125                                signed long alarm_temp)
126 {
127         struct regmap *map = data->tempmon;
128         int alarm_value;
129 
130         data->alarm_temp = alarm_temp;
131         alarm_value = (data->c2 - alarm_temp) / data->c1;
132         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
133         regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
134                         TEMPSENSE0_ALARM_VALUE_SHIFT);
135 }
136 
137 static int imx_get_temp(struct thermal_zone_device *tz, unsigned long *temp)
138 {
139         struct imx_thermal_data *data = tz->devdata;
140         struct regmap *map = data->tempmon;
141         unsigned int n_meas;
142         bool wait;
143         u32 val;
144 
145         if (data->mode == THERMAL_DEVICE_ENABLED) {
146                 /* Check if a measurement is currently in progress */
147                 regmap_read(map, TEMPSENSE0, &val);
148                 wait = !(val & TEMPSENSE0_FINISHED);
149         } else {
150                 /*
151                  * Every time we measure the temperature, we will power on the
152                  * temperature sensor, enable measurements, take a reading,
153                  * disable measurements, power off the temperature sensor.
154                  */
155                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
156                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
157 
158                 wait = true;
159         }
160 
161         /*
162          * According to the temp sensor designers, it may require up to ~17us
163          * to complete a measurement.
164          */
165         if (wait)
166                 usleep_range(20, 50);
167 
168         regmap_read(map, TEMPSENSE0, &val);
169 
170         if (data->mode != THERMAL_DEVICE_ENABLED) {
171                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
172                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
173         }
174 
175         if ((val & TEMPSENSE0_FINISHED) == 0) {
176                 dev_dbg(&tz->device, "temp measurement never finished\n");
177                 return -EAGAIN;
178         }
179 
180         n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
181 
182         /* See imx_get_sensor_data() for formula derivation */
183         *temp = data->c2 - n_meas * data->c1;
184 
185         /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
186         if (data->socdata->version == TEMPMON_IMX6Q) {
187                 if (data->alarm_temp == data->temp_passive &&
188                         *temp >= data->temp_passive)
189                         imx_set_alarm_temp(data, data->temp_critical);
190                 if (data->alarm_temp == data->temp_critical &&
191                         *temp < data->temp_passive) {
192                         imx_set_alarm_temp(data, data->temp_passive);
193                         dev_dbg(&tz->device, "thermal alarm off: T < %lu\n",
194                                 data->alarm_temp / 1000);
195                 }
196         }
197 
198         if (*temp != data->last_temp) {
199                 dev_dbg(&tz->device, "millicelsius: %ld\n", *temp);
200                 data->last_temp = *temp;
201         }
202 
203         /* Reenable alarm IRQ if temperature below alarm temperature */
204         if (!data->irq_enabled && *temp < data->alarm_temp) {
205                 data->irq_enabled = true;
206                 enable_irq(data->irq);
207         }
208 
209         return 0;
210 }
211 
212 static int imx_get_mode(struct thermal_zone_device *tz,
213                         enum thermal_device_mode *mode)
214 {
215         struct imx_thermal_data *data = tz->devdata;
216 
217         *mode = data->mode;
218 
219         return 0;
220 }
221 
222 static int imx_set_mode(struct thermal_zone_device *tz,
223                         enum thermal_device_mode mode)
224 {
225         struct imx_thermal_data *data = tz->devdata;
226         struct regmap *map = data->tempmon;
227 
228         if (mode == THERMAL_DEVICE_ENABLED) {
229                 tz->polling_delay = IMX_POLLING_DELAY;
230                 tz->passive_delay = IMX_PASSIVE_DELAY;
231 
232                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
233                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
234 
235                 if (!data->irq_enabled) {
236                         data->irq_enabled = true;
237                         enable_irq(data->irq);
238                 }
239         } else {
240                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
241                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
242 
243                 tz->polling_delay = 0;
244                 tz->passive_delay = 0;
245 
246                 if (data->irq_enabled) {
247                         disable_irq(data->irq);
248                         data->irq_enabled = false;
249                 }
250         }
251 
252         data->mode = mode;
253         thermal_zone_device_update(tz);
254 
255         return 0;
256 }
257 
258 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
259                              enum thermal_trip_type *type)
260 {
261         *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
262                                              THERMAL_TRIP_CRITICAL;
263         return 0;
264 }
265 
266 static int imx_get_crit_temp(struct thermal_zone_device *tz,
267                              unsigned long *temp)
268 {
269         struct imx_thermal_data *data = tz->devdata;
270 
271         *temp = data->temp_critical;
272         return 0;
273 }
274 
275 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
276                              unsigned long *temp)
277 {
278         struct imx_thermal_data *data = tz->devdata;
279 
280         *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
281                                              data->temp_critical;
282         return 0;
283 }
284 
285 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
286                              unsigned long temp)
287 {
288         struct imx_thermal_data *data = tz->devdata;
289 
290         if (trip == IMX_TRIP_CRITICAL)
291                 return -EPERM;
292 
293         if (temp > IMX_TEMP_PASSIVE)
294                 return -EINVAL;
295 
296         data->temp_passive = temp;
297 
298         imx_set_alarm_temp(data, temp);
299 
300         return 0;
301 }
302 
303 static int imx_bind(struct thermal_zone_device *tz,
304                     struct thermal_cooling_device *cdev)
305 {
306         int ret;
307 
308         ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
309                                                THERMAL_NO_LIMIT,
310                                                THERMAL_NO_LIMIT);
311         if (ret) {
312                 dev_err(&tz->device,
313                         "binding zone %s with cdev %s failed:%d\n",
314                         tz->type, cdev->type, ret);
315                 return ret;
316         }
317 
318         return 0;
319 }
320 
321 static int imx_unbind(struct thermal_zone_device *tz,
322                       struct thermal_cooling_device *cdev)
323 {
324         int ret;
325 
326         ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
327         if (ret) {
328                 dev_err(&tz->device,
329                         "unbinding zone %s with cdev %s failed:%d\n",
330                         tz->type, cdev->type, ret);
331                 return ret;
332         }
333 
334         return 0;
335 }
336 
337 static struct thermal_zone_device_ops imx_tz_ops = {
338         .bind = imx_bind,
339         .unbind = imx_unbind,
340         .get_temp = imx_get_temp,
341         .get_mode = imx_get_mode,
342         .set_mode = imx_set_mode,
343         .get_trip_type = imx_get_trip_type,
344         .get_trip_temp = imx_get_trip_temp,
345         .get_crit_temp = imx_get_crit_temp,
346         .set_trip_temp = imx_set_trip_temp,
347 };
348 
349 static int imx_get_sensor_data(struct platform_device *pdev)
350 {
351         struct imx_thermal_data *data = platform_get_drvdata(pdev);
352         struct regmap *map;
353         int t1, n1;
354         int ret;
355         u32 val;
356         u64 temp64;
357 
358         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
359                                               "fsl,tempmon-data");
360         if (IS_ERR(map)) {
361                 ret = PTR_ERR(map);
362                 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
363                 return ret;
364         }
365 
366         ret = regmap_read(map, OCOTP_ANA1, &val);
367         if (ret) {
368                 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
369                 return ret;
370         }
371 
372         if (val == 0 || val == ~0) {
373                 dev_err(&pdev->dev, "invalid sensor calibration data\n");
374                 return -EINVAL;
375         }
376 
377         /*
378          * Sensor data layout:
379          *   [31:20] - sensor value @ 25C
380          * Use universal formula now and only need sensor value @ 25C
381          * slope = 0.4297157 - (0.0015976 * 25C fuse)
382          */
383         n1 = val >> 20;
384         t1 = 25; /* t1 always 25C */
385 
386         /*
387          * Derived from linear interpolation:
388          * slope = 0.4297157 - (0.0015976 * 25C fuse)
389          * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
390          * (Nmeas - n1) / (Tmeas - t1) = slope
391          * We want to reduce this down to the minimum computation necessary
392          * for each temperature read.  Also, we want Tmeas in millicelsius
393          * and we don't want to lose precision from integer division. So...
394          * Tmeas = (Nmeas - n1) / slope + t1
395          * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
396          * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
397          * Let constant c1 = (-1000 / slope)
398          * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
399          * Let constant c2 = n1 *c1 + 1000 * t1
400          * milli_Tmeas = c2 - Nmeas * c1
401          */
402         temp64 = FACTOR0;
403         temp64 *= 1000;
404         do_div(temp64, FACTOR1 * n1 - FACTOR2);
405         data->c1 = temp64;
406         data->c2 = n1 * data->c1 + 1000 * t1;
407 
408         /*
409          * Set the default passive cooling trip point,
410          * can be changed from userspace.
411          */
412         data->temp_passive = IMX_TEMP_PASSIVE;
413 
414         /*
415          * The maximum die temperature set to 20 C higher than
416          * IMX_TEMP_PASSIVE.
417          */
418         data->temp_critical = 1000 * 20 + data->temp_passive;
419 
420         return 0;
421 }
422 
423 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
424 {
425         struct imx_thermal_data *data = dev;
426 
427         disable_irq_nosync(irq);
428         data->irq_enabled = false;
429 
430         return IRQ_WAKE_THREAD;
431 }
432 
433 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
434 {
435         struct imx_thermal_data *data = dev;
436 
437         dev_dbg(&data->tz->device, "THERMAL ALARM: T > %lu\n",
438                 data->alarm_temp / 1000);
439 
440         thermal_zone_device_update(data->tz);
441 
442         return IRQ_HANDLED;
443 }
444 
445 static const struct of_device_id of_imx_thermal_match[] = {
446         { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
447         { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
448         { /* end */ }
449 };
450 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
451 
452 static int imx_thermal_probe(struct platform_device *pdev)
453 {
454         const struct of_device_id *of_id =
455                 of_match_device(of_imx_thermal_match, &pdev->dev);
456         struct imx_thermal_data *data;
457         struct cpumask clip_cpus;
458         struct regmap *map;
459         int measure_freq;
460         int ret;
461 
462         if (!cpufreq_get_current_driver()) {
463                 dev_dbg(&pdev->dev, "no cpufreq driver!");
464                 return -EPROBE_DEFER;
465         }
466         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
467         if (!data)
468                 return -ENOMEM;
469 
470         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
471         if (IS_ERR(map)) {
472                 ret = PTR_ERR(map);
473                 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
474                 return ret;
475         }
476         data->tempmon = map;
477 
478         data->socdata = of_id->data;
479 
480         /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
481         if (data->socdata->version == TEMPMON_IMX6SX) {
482                 regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH |
483                         MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC);
484                 /*
485                  * reset value of LOW ALARM is incorrect, set it to lowest
486                  * value to avoid false trigger of low alarm.
487                  */
488                 regmap_write(map, TEMPSENSE2 + REG_SET,
489                         TEMPSENSE2_LOW_VALUE_MASK);
490         }
491 
492         data->irq = platform_get_irq(pdev, 0);
493         if (data->irq < 0)
494                 return data->irq;
495 
496         ret = devm_request_threaded_irq(&pdev->dev, data->irq,
497                         imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
498                         0, "imx_thermal", data);
499         if (ret < 0) {
500                 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
501                 return ret;
502         }
503 
504         platform_set_drvdata(pdev, data);
505 
506         ret = imx_get_sensor_data(pdev);
507         if (ret) {
508                 dev_err(&pdev->dev, "failed to get sensor data\n");
509                 return ret;
510         }
511 
512         /* Make sure sensor is in known good state for measurements */
513         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
514         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
515         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
516         regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
517         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
518 
519         cpumask_set_cpu(0, &clip_cpus);
520         data->cdev = cpufreq_cooling_register(&clip_cpus);
521         if (IS_ERR(data->cdev)) {
522                 ret = PTR_ERR(data->cdev);
523                 dev_err(&pdev->dev,
524                         "failed to register cpufreq cooling device: %d\n", ret);
525                 return ret;
526         }
527 
528         data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
529         if (IS_ERR(data->thermal_clk)) {
530                 ret = PTR_ERR(data->thermal_clk);
531                 if (ret != -EPROBE_DEFER)
532                         dev_err(&pdev->dev,
533                                 "failed to get thermal clk: %d\n", ret);
534                 cpufreq_cooling_unregister(data->cdev);
535                 return ret;
536         }
537 
538         /*
539          * Thermal sensor needs clk on to get correct value, normally
540          * we should enable its clk before taking measurement and disable
541          * clk after measurement is done, but if alarm function is enabled,
542          * hardware will auto measure the temperature periodically, so we
543          * need to keep the clk always on for alarm function.
544          */
545         ret = clk_prepare_enable(data->thermal_clk);
546         if (ret) {
547                 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
548                 cpufreq_cooling_unregister(data->cdev);
549                 return ret;
550         }
551 
552         data->tz = thermal_zone_device_register("imx_thermal_zone",
553                                                 IMX_TRIP_NUM,
554                                                 BIT(IMX_TRIP_PASSIVE), data,
555                                                 &imx_tz_ops, NULL,
556                                                 IMX_PASSIVE_DELAY,
557                                                 IMX_POLLING_DELAY);
558         if (IS_ERR(data->tz)) {
559                 ret = PTR_ERR(data->tz);
560                 dev_err(&pdev->dev,
561                         "failed to register thermal zone device %d\n", ret);
562                 clk_disable_unprepare(data->thermal_clk);
563                 cpufreq_cooling_unregister(data->cdev);
564                 return ret;
565         }
566 
567         /* Enable measurements at ~ 10 Hz */
568         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
569         measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
570         regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
571         imx_set_alarm_temp(data, data->temp_passive);
572 
573         if (data->socdata->version == TEMPMON_IMX6SX)
574                 imx_set_panic_temp(data, data->temp_critical);
575 
576         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
577         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
578 
579         data->irq_enabled = true;
580         data->mode = THERMAL_DEVICE_ENABLED;
581 
582         return 0;
583 }
584 
585 static int imx_thermal_remove(struct platform_device *pdev)
586 {
587         struct imx_thermal_data *data = platform_get_drvdata(pdev);
588         struct regmap *map = data->tempmon;
589 
590         /* Disable measurements */
591         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
592         if (!IS_ERR(data->thermal_clk))
593                 clk_disable_unprepare(data->thermal_clk);
594 
595         thermal_zone_device_unregister(data->tz);
596         cpufreq_cooling_unregister(data->cdev);
597 
598         return 0;
599 }
600 
601 #ifdef CONFIG_PM_SLEEP
602 static int imx_thermal_suspend(struct device *dev)
603 {
604         struct imx_thermal_data *data = dev_get_drvdata(dev);
605         struct regmap *map = data->tempmon;
606 
607         /*
608          * Need to disable thermal sensor, otherwise, when thermal core
609          * try to get temperature before thermal sensor resume, a wrong
610          * temperature will be read as the thermal sensor is powered
611          * down.
612          */
613         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
614         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
615         data->mode = THERMAL_DEVICE_DISABLED;
616 
617         return 0;
618 }
619 
620 static int imx_thermal_resume(struct device *dev)
621 {
622         struct imx_thermal_data *data = dev_get_drvdata(dev);
623         struct regmap *map = data->tempmon;
624 
625         /* Enabled thermal sensor after resume */
626         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
627         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
628         data->mode = THERMAL_DEVICE_ENABLED;
629 
630         return 0;
631 }
632 #endif
633 
634 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
635                          imx_thermal_suspend, imx_thermal_resume);
636 
637 static struct platform_driver imx_thermal = {
638         .driver = {
639                 .name   = "imx_thermal",
640                 .owner  = THIS_MODULE,
641                 .pm     = &imx_thermal_pm_ops,
642                 .of_match_table = of_imx_thermal_match,
643         },
644         .probe          = imx_thermal_probe,
645         .remove         = imx_thermal_remove,
646 };
647 module_platform_driver(imx_thermal);
648 
649 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
650 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
651 MODULE_LICENSE("GPL v2");
652 MODULE_ALIAS("platform:imx-thermal");
653 

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