Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

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_MEM0                      0x0480
 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 #define IMX_POLLING_DELAY               2000 /* millisecond */
 69 #define IMX_PASSIVE_DELAY               1000
 70 
 71 #define FACTOR0                         10000000
 72 #define FACTOR1                         15976
 73 #define FACTOR2                         4297157
 74 
 75 #define TEMPMON_IMX6Q                   1
 76 #define TEMPMON_IMX6SX                  2
 77 
 78 struct thermal_soc_data {
 79         u32 version;
 80 };
 81 
 82 static struct thermal_soc_data thermal_imx6q_data = {
 83         .version = TEMPMON_IMX6Q,
 84 };
 85 
 86 static struct thermal_soc_data thermal_imx6sx_data = {
 87         .version = TEMPMON_IMX6SX,
 88 };
 89 
 90 struct imx_thermal_data {
 91         struct thermal_zone_device *tz;
 92         struct thermal_cooling_device *cdev;
 93         enum thermal_device_mode mode;
 94         struct regmap *tempmon;
 95         u32 c1, c2; /* See formula in imx_get_sensor_data() */
 96         int temp_passive;
 97         int temp_critical;
 98         int temp_max;
 99         int alarm_temp;
100         int last_temp;
101         bool irq_enabled;
102         int irq;
103         struct clk *thermal_clk;
104         const struct thermal_soc_data *socdata;
105         const char *temp_grade;
106 };
107 
108 static void imx_set_panic_temp(struct imx_thermal_data *data,
109                                int panic_temp)
110 {
111         struct regmap *map = data->tempmon;
112         int critical_value;
113 
114         critical_value = (data->c2 - panic_temp) / data->c1;
115         regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
116         regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
117                         TEMPSENSE2_PANIC_VALUE_SHIFT);
118 }
119 
120 static void imx_set_alarm_temp(struct imx_thermal_data *data,
121                                int alarm_temp)
122 {
123         struct regmap *map = data->tempmon;
124         int alarm_value;
125 
126         data->alarm_temp = alarm_temp;
127         alarm_value = (data->c2 - alarm_temp) / data->c1;
128         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
129         regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
130                         TEMPSENSE0_ALARM_VALUE_SHIFT);
131 }
132 
133 static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
134 {
135         struct imx_thermal_data *data = tz->devdata;
136         struct regmap *map = data->tempmon;
137         unsigned int n_meas;
138         bool wait;
139         u32 val;
140 
141         if (data->mode == THERMAL_DEVICE_ENABLED) {
142                 /* Check if a measurement is currently in progress */
143                 regmap_read(map, TEMPSENSE0, &val);
144                 wait = !(val & TEMPSENSE0_FINISHED);
145         } else {
146                 /*
147                  * Every time we measure the temperature, we will power on the
148                  * temperature sensor, enable measurements, take a reading,
149                  * disable measurements, power off the temperature sensor.
150                  */
151                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
152                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
153 
154                 wait = true;
155         }
156 
157         /*
158          * According to the temp sensor designers, it may require up to ~17us
159          * to complete a measurement.
160          */
161         if (wait)
162                 usleep_range(20, 50);
163 
164         regmap_read(map, TEMPSENSE0, &val);
165 
166         if (data->mode != THERMAL_DEVICE_ENABLED) {
167                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
168                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
169         }
170 
171         if ((val & TEMPSENSE0_FINISHED) == 0) {
172                 dev_dbg(&tz->device, "temp measurement never finished\n");
173                 return -EAGAIN;
174         }
175 
176         n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
177 
178         /* See imx_get_sensor_data() for formula derivation */
179         *temp = data->c2 - n_meas * data->c1;
180 
181         /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
182         if (data->socdata->version == TEMPMON_IMX6Q) {
183                 if (data->alarm_temp == data->temp_passive &&
184                         *temp >= data->temp_passive)
185                         imx_set_alarm_temp(data, data->temp_critical);
186                 if (data->alarm_temp == data->temp_critical &&
187                         *temp < data->temp_passive) {
188                         imx_set_alarm_temp(data, data->temp_passive);
189                         dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
190                                 data->alarm_temp / 1000);
191                 }
192         }
193 
194         if (*temp != data->last_temp) {
195                 dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
196                 data->last_temp = *temp;
197         }
198 
199         /* Reenable alarm IRQ if temperature below alarm temperature */
200         if (!data->irq_enabled && *temp < data->alarm_temp) {
201                 data->irq_enabled = true;
202                 enable_irq(data->irq);
203         }
204 
205         return 0;
206 }
207 
208 static int imx_get_mode(struct thermal_zone_device *tz,
209                         enum thermal_device_mode *mode)
210 {
211         struct imx_thermal_data *data = tz->devdata;
212 
213         *mode = data->mode;
214 
215         return 0;
216 }
217 
218 static int imx_set_mode(struct thermal_zone_device *tz,
219                         enum thermal_device_mode mode)
220 {
221         struct imx_thermal_data *data = tz->devdata;
222         struct regmap *map = data->tempmon;
223 
224         if (mode == THERMAL_DEVICE_ENABLED) {
225                 tz->polling_delay = IMX_POLLING_DELAY;
226                 tz->passive_delay = IMX_PASSIVE_DELAY;
227 
228                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
229                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
230 
231                 if (!data->irq_enabled) {
232                         data->irq_enabled = true;
233                         enable_irq(data->irq);
234                 }
235         } else {
236                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
237                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
238 
239                 tz->polling_delay = 0;
240                 tz->passive_delay = 0;
241 
242                 if (data->irq_enabled) {
243                         disable_irq(data->irq);
244                         data->irq_enabled = false;
245                 }
246         }
247 
248         data->mode = mode;
249         thermal_zone_device_update(tz);
250 
251         return 0;
252 }
253 
254 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
255                              enum thermal_trip_type *type)
256 {
257         *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
258                                              THERMAL_TRIP_CRITICAL;
259         return 0;
260 }
261 
262 static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
263 {
264         struct imx_thermal_data *data = tz->devdata;
265 
266         *temp = data->temp_critical;
267         return 0;
268 }
269 
270 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
271                              int *temp)
272 {
273         struct imx_thermal_data *data = tz->devdata;
274 
275         *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
276                                              data->temp_critical;
277         return 0;
278 }
279 
280 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
281                              int temp)
282 {
283         struct imx_thermal_data *data = tz->devdata;
284 
285         /* do not allow changing critical threshold */
286         if (trip == IMX_TRIP_CRITICAL)
287                 return -EPERM;
288 
289         /* do not allow passive to be set higher than critical */
290         if (temp < 0 || temp > data->temp_critical)
291                 return -EINVAL;
292 
293         data->temp_passive = temp;
294 
295         imx_set_alarm_temp(data, temp);
296 
297         return 0;
298 }
299 
300 static int imx_bind(struct thermal_zone_device *tz,
301                     struct thermal_cooling_device *cdev)
302 {
303         int ret;
304 
305         ret = thermal_zone_bind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev,
306                                                THERMAL_NO_LIMIT,
307                                                THERMAL_NO_LIMIT,
308                                                THERMAL_WEIGHT_DEFAULT);
309         if (ret) {
310                 dev_err(&tz->device,
311                         "binding zone %s with cdev %s failed:%d\n",
312                         tz->type, cdev->type, ret);
313                 return ret;
314         }
315 
316         return 0;
317 }
318 
319 static int imx_unbind(struct thermal_zone_device *tz,
320                       struct thermal_cooling_device *cdev)
321 {
322         int ret;
323 
324         ret = thermal_zone_unbind_cooling_device(tz, IMX_TRIP_PASSIVE, cdev);
325         if (ret) {
326                 dev_err(&tz->device,
327                         "unbinding zone %s with cdev %s failed:%d\n",
328                         tz->type, cdev->type, ret);
329                 return ret;
330         }
331 
332         return 0;
333 }
334 
335 static struct thermal_zone_device_ops imx_tz_ops = {
336         .bind = imx_bind,
337         .unbind = imx_unbind,
338         .get_temp = imx_get_temp,
339         .get_mode = imx_get_mode,
340         .set_mode = imx_set_mode,
341         .get_trip_type = imx_get_trip_type,
342         .get_trip_temp = imx_get_trip_temp,
343         .get_crit_temp = imx_get_crit_temp,
344         .set_trip_temp = imx_set_trip_temp,
345 };
346 
347 static int imx_get_sensor_data(struct platform_device *pdev)
348 {
349         struct imx_thermal_data *data = platform_get_drvdata(pdev);
350         struct regmap *map;
351         int t1, n1;
352         int ret;
353         u32 val;
354         u64 temp64;
355 
356         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node,
357                                               "fsl,tempmon-data");
358         if (IS_ERR(map)) {
359                 ret = PTR_ERR(map);
360                 dev_err(&pdev->dev, "failed to get sensor regmap: %d\n", ret);
361                 return ret;
362         }
363 
364         ret = regmap_read(map, OCOTP_ANA1, &val);
365         if (ret) {
366                 dev_err(&pdev->dev, "failed to read sensor data: %d\n", ret);
367                 return ret;
368         }
369 
370         if (val == 0 || val == ~0) {
371                 dev_err(&pdev->dev, "invalid sensor calibration data\n");
372                 return -EINVAL;
373         }
374 
375         /*
376          * Sensor data layout:
377          *   [31:20] - sensor value @ 25C
378          * Use universal formula now and only need sensor value @ 25C
379          * slope = 0.4297157 - (0.0015976 * 25C fuse)
380          */
381         n1 = val >> 20;
382         t1 = 25; /* t1 always 25C */
383 
384         /*
385          * Derived from linear interpolation:
386          * slope = 0.4297157 - (0.0015976 * 25C fuse)
387          * slope = (FACTOR2 - FACTOR1 * n1) / FACTOR0
388          * (Nmeas - n1) / (Tmeas - t1) = slope
389          * We want to reduce this down to the minimum computation necessary
390          * for each temperature read.  Also, we want Tmeas in millicelsius
391          * and we don't want to lose precision from integer division. So...
392          * Tmeas = (Nmeas - n1) / slope + t1
393          * milli_Tmeas = 1000 * (Nmeas - n1) / slope + 1000 * t1
394          * milli_Tmeas = -1000 * (n1 - Nmeas) / slope + 1000 * t1
395          * Let constant c1 = (-1000 / slope)
396          * milli_Tmeas = (n1 - Nmeas) * c1 + 1000 * t1
397          * Let constant c2 = n1 *c1 + 1000 * t1
398          * milli_Tmeas = c2 - Nmeas * c1
399          */
400         temp64 = FACTOR0;
401         temp64 *= 1000;
402         do_div(temp64, FACTOR1 * n1 - FACTOR2);
403         data->c1 = temp64;
404         data->c2 = n1 * data->c1 + 1000 * t1;
405 
406         /* use OTP for thermal grade */
407         ret = regmap_read(map, OCOTP_MEM0, &val);
408         if (ret) {
409                 dev_err(&pdev->dev, "failed to read temp grade: %d\n", ret);
410                 return ret;
411         }
412 
413         /* The maximum die temp is specified by the Temperature Grade */
414         switch ((val >> 6) & 0x3) {
415         case 0: /* Commercial (0 to 95C) */
416                 data->temp_grade = "Commercial";
417                 data->temp_max = 95000;
418                 break;
419         case 1: /* Extended Commercial (-20 to 105C) */
420                 data->temp_grade = "Extended Commercial";
421                 data->temp_max = 105000;
422                 break;
423         case 2: /* Industrial (-40 to 105C) */
424                 data->temp_grade = "Industrial";
425                 data->temp_max = 105000;
426                 break;
427         case 3: /* Automotive (-40 to 125C) */
428                 data->temp_grade = "Automotive";
429                 data->temp_max = 125000;
430                 break;
431         }
432 
433         /*
434          * Set the critical trip point at 5C under max
435          * Set the passive trip point at 10C under max (can change via sysfs)
436          */
437         data->temp_critical = data->temp_max - (1000 * 5);
438         data->temp_passive = data->temp_max - (1000 * 10);
439 
440         return 0;
441 }
442 
443 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
444 {
445         struct imx_thermal_data *data = dev;
446 
447         disable_irq_nosync(irq);
448         data->irq_enabled = false;
449 
450         return IRQ_WAKE_THREAD;
451 }
452 
453 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
454 {
455         struct imx_thermal_data *data = dev;
456 
457         dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
458                 data->alarm_temp / 1000);
459 
460         thermal_zone_device_update(data->tz);
461 
462         return IRQ_HANDLED;
463 }
464 
465 static const struct of_device_id of_imx_thermal_match[] = {
466         { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
467         { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
468         { /* end */ }
469 };
470 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
471 
472 static int imx_thermal_probe(struct platform_device *pdev)
473 {
474         const struct of_device_id *of_id =
475                 of_match_device(of_imx_thermal_match, &pdev->dev);
476         struct imx_thermal_data *data;
477         struct regmap *map;
478         int measure_freq;
479         int ret;
480 
481         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
482         if (!data)
483                 return -ENOMEM;
484 
485         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
486         if (IS_ERR(map)) {
487                 ret = PTR_ERR(map);
488                 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
489                 return ret;
490         }
491         data->tempmon = map;
492 
493         data->socdata = of_id->data;
494 
495         /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
496         if (data->socdata->version == TEMPMON_IMX6SX) {
497                 regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH |
498                         MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC);
499                 /*
500                  * reset value of LOW ALARM is incorrect, set it to lowest
501                  * value to avoid false trigger of low alarm.
502                  */
503                 regmap_write(map, TEMPSENSE2 + REG_SET,
504                         TEMPSENSE2_LOW_VALUE_MASK);
505         }
506 
507         data->irq = platform_get_irq(pdev, 0);
508         if (data->irq < 0)
509                 return data->irq;
510 
511         platform_set_drvdata(pdev, data);
512 
513         ret = imx_get_sensor_data(pdev);
514         if (ret) {
515                 dev_err(&pdev->dev, "failed to get sensor data\n");
516                 return ret;
517         }
518 
519         /* Make sure sensor is in known good state for measurements */
520         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
521         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
522         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
523         regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
524         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
525 
526         data->cdev = cpufreq_cooling_register(cpu_present_mask);
527         if (IS_ERR(data->cdev)) {
528                 ret = PTR_ERR(data->cdev);
529                 if (ret != -EPROBE_DEFER)
530                         dev_err(&pdev->dev,
531                                 "failed to register cpufreq cooling device: %d\n",
532                                 ret);
533                 return ret;
534         }
535 
536         data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
537         if (IS_ERR(data->thermal_clk)) {
538                 ret = PTR_ERR(data->thermal_clk);
539                 if (ret != -EPROBE_DEFER)
540                         dev_err(&pdev->dev,
541                                 "failed to get thermal clk: %d\n", ret);
542                 cpufreq_cooling_unregister(data->cdev);
543                 return ret;
544         }
545 
546         /*
547          * Thermal sensor needs clk on to get correct value, normally
548          * we should enable its clk before taking measurement and disable
549          * clk after measurement is done, but if alarm function is enabled,
550          * hardware will auto measure the temperature periodically, so we
551          * need to keep the clk always on for alarm function.
552          */
553         ret = clk_prepare_enable(data->thermal_clk);
554         if (ret) {
555                 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
556                 cpufreq_cooling_unregister(data->cdev);
557                 return ret;
558         }
559 
560         data->tz = thermal_zone_device_register("imx_thermal_zone",
561                                                 IMX_TRIP_NUM,
562                                                 BIT(IMX_TRIP_PASSIVE), data,
563                                                 &imx_tz_ops, NULL,
564                                                 IMX_PASSIVE_DELAY,
565                                                 IMX_POLLING_DELAY);
566         if (IS_ERR(data->tz)) {
567                 ret = PTR_ERR(data->tz);
568                 dev_err(&pdev->dev,
569                         "failed to register thermal zone device %d\n", ret);
570                 clk_disable_unprepare(data->thermal_clk);
571                 cpufreq_cooling_unregister(data->cdev);
572                 return ret;
573         }
574 
575         dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
576                  " critical:%dC passive:%dC\n", data->temp_grade,
577                  data->temp_max / 1000, data->temp_critical / 1000,
578                  data->temp_passive / 1000);
579 
580         /* Enable measurements at ~ 10 Hz */
581         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
582         measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
583         regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
584         imx_set_alarm_temp(data, data->temp_passive);
585 
586         if (data->socdata->version == TEMPMON_IMX6SX)
587                 imx_set_panic_temp(data, data->temp_critical);
588 
589         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
590         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
591 
592         ret = devm_request_threaded_irq(&pdev->dev, data->irq,
593                         imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
594                         0, "imx_thermal", data);
595         if (ret < 0) {
596                 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
597                 clk_disable_unprepare(data->thermal_clk);
598                 thermal_zone_device_unregister(data->tz);
599                 cpufreq_cooling_unregister(data->cdev);
600                 return ret;
601         }
602 
603         data->irq_enabled = true;
604         data->mode = THERMAL_DEVICE_ENABLED;
605 
606         return 0;
607 }
608 
609 static int imx_thermal_remove(struct platform_device *pdev)
610 {
611         struct imx_thermal_data *data = platform_get_drvdata(pdev);
612         struct regmap *map = data->tempmon;
613 
614         /* Disable measurements */
615         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
616         if (!IS_ERR(data->thermal_clk))
617                 clk_disable_unprepare(data->thermal_clk);
618 
619         thermal_zone_device_unregister(data->tz);
620         cpufreq_cooling_unregister(data->cdev);
621 
622         return 0;
623 }
624 
625 #ifdef CONFIG_PM_SLEEP
626 static int imx_thermal_suspend(struct device *dev)
627 {
628         struct imx_thermal_data *data = dev_get_drvdata(dev);
629         struct regmap *map = data->tempmon;
630 
631         /*
632          * Need to disable thermal sensor, otherwise, when thermal core
633          * try to get temperature before thermal sensor resume, a wrong
634          * temperature will be read as the thermal sensor is powered
635          * down.
636          */
637         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
638         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
639         data->mode = THERMAL_DEVICE_DISABLED;
640         clk_disable_unprepare(data->thermal_clk);
641 
642         return 0;
643 }
644 
645 static int imx_thermal_resume(struct device *dev)
646 {
647         struct imx_thermal_data *data = dev_get_drvdata(dev);
648         struct regmap *map = data->tempmon;
649 
650         clk_prepare_enable(data->thermal_clk);
651         /* Enabled thermal sensor after resume */
652         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
653         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
654         data->mode = THERMAL_DEVICE_ENABLED;
655 
656         return 0;
657 }
658 #endif
659 
660 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
661                          imx_thermal_suspend, imx_thermal_resume);
662 
663 static struct platform_driver imx_thermal = {
664         .driver = {
665                 .name   = "imx_thermal",
666                 .pm     = &imx_thermal_pm_ops,
667                 .of_match_table = of_imx_thermal_match,
668         },
669         .probe          = imx_thermal_probe,
670         .remove         = imx_thermal_remove,
671 };
672 module_platform_driver(imx_thermal);
673 
674 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
675 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
676 MODULE_LICENSE("GPL v2");
677 MODULE_ALIAS("platform:imx-thermal");
678 

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