Version:  2.0.40 2.2.26 2.4.37 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 3.19

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

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us