Merge tag 'mmc-v4.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
[sfrench/cifs-2.6.git] / 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, THERMAL_EVENT_UNSPECIFIED);
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, THERMAL_EVENT_UNSPECIFIED);
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         struct imx_thermal_data *data;
475         struct regmap *map;
476         int measure_freq;
477         int ret;
478
479         data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
480         if (!data)
481                 return -ENOMEM;
482
483         map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "fsl,tempmon");
484         if (IS_ERR(map)) {
485                 ret = PTR_ERR(map);
486                 dev_err(&pdev->dev, "failed to get tempmon regmap: %d\n", ret);
487                 return ret;
488         }
489         data->tempmon = map;
490
491         data->socdata = of_device_get_match_data(&pdev->dev);
492         if (!data->socdata) {
493                 dev_err(&pdev->dev, "no device match found\n");
494                 return -ENODEV;
495         }
496
497         /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
498         if (data->socdata->version == TEMPMON_IMX6SX) {
499                 regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH |
500                         MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC);
501                 /*
502                  * reset value of LOW ALARM is incorrect, set it to lowest
503                  * value to avoid false trigger of low alarm.
504                  */
505                 regmap_write(map, TEMPSENSE2 + REG_SET,
506                         TEMPSENSE2_LOW_VALUE_MASK);
507         }
508
509         data->irq = platform_get_irq(pdev, 0);
510         if (data->irq < 0)
511                 return data->irq;
512
513         platform_set_drvdata(pdev, data);
514
515         ret = imx_get_sensor_data(pdev);
516         if (ret) {
517                 dev_err(&pdev->dev, "failed to get sensor data\n");
518                 return ret;
519         }
520
521         /* Make sure sensor is in known good state for measurements */
522         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
523         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
524         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
525         regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
526         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
527
528         data->cdev = cpufreq_cooling_register(cpu_present_mask);
529         if (IS_ERR(data->cdev)) {
530                 ret = PTR_ERR(data->cdev);
531                 if (ret != -EPROBE_DEFER)
532                         dev_err(&pdev->dev,
533                                 "failed to register cpufreq cooling device: %d\n",
534                                 ret);
535                 return ret;
536         }
537
538         data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
539         if (IS_ERR(data->thermal_clk)) {
540                 ret = PTR_ERR(data->thermal_clk);
541                 if (ret != -EPROBE_DEFER)
542                         dev_err(&pdev->dev,
543                                 "failed to get thermal clk: %d\n", ret);
544                 cpufreq_cooling_unregister(data->cdev);
545                 return ret;
546         }
547
548         /*
549          * Thermal sensor needs clk on to get correct value, normally
550          * we should enable its clk before taking measurement and disable
551          * clk after measurement is done, but if alarm function is enabled,
552          * hardware will auto measure the temperature periodically, so we
553          * need to keep the clk always on for alarm function.
554          */
555         ret = clk_prepare_enable(data->thermal_clk);
556         if (ret) {
557                 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
558                 cpufreq_cooling_unregister(data->cdev);
559                 return ret;
560         }
561
562         data->tz = thermal_zone_device_register("imx_thermal_zone",
563                                                 IMX_TRIP_NUM,
564                                                 BIT(IMX_TRIP_PASSIVE), data,
565                                                 &imx_tz_ops, NULL,
566                                                 IMX_PASSIVE_DELAY,
567                                                 IMX_POLLING_DELAY);
568         if (IS_ERR(data->tz)) {
569                 ret = PTR_ERR(data->tz);
570                 dev_err(&pdev->dev,
571                         "failed to register thermal zone device %d\n", ret);
572                 clk_disable_unprepare(data->thermal_clk);
573                 cpufreq_cooling_unregister(data->cdev);
574                 return ret;
575         }
576
577         dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
578                  " critical:%dC passive:%dC\n", data->temp_grade,
579                  data->temp_max / 1000, data->temp_critical / 1000,
580                  data->temp_passive / 1000);
581
582         /* Enable measurements at ~ 10 Hz */
583         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
584         measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
585         regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
586         imx_set_alarm_temp(data, data->temp_passive);
587
588         if (data->socdata->version == TEMPMON_IMX6SX)
589                 imx_set_panic_temp(data, data->temp_critical);
590
591         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
592         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
593
594         ret = devm_request_threaded_irq(&pdev->dev, data->irq,
595                         imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
596                         0, "imx_thermal", data);
597         if (ret < 0) {
598                 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
599                 clk_disable_unprepare(data->thermal_clk);
600                 thermal_zone_device_unregister(data->tz);
601                 cpufreq_cooling_unregister(data->cdev);
602                 return ret;
603         }
604
605         data->irq_enabled = true;
606         data->mode = THERMAL_DEVICE_ENABLED;
607
608         return 0;
609 }
610
611 static int imx_thermal_remove(struct platform_device *pdev)
612 {
613         struct imx_thermal_data *data = platform_get_drvdata(pdev);
614         struct regmap *map = data->tempmon;
615
616         /* Disable measurements */
617         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
618         if (!IS_ERR(data->thermal_clk))
619                 clk_disable_unprepare(data->thermal_clk);
620
621         thermal_zone_device_unregister(data->tz);
622         cpufreq_cooling_unregister(data->cdev);
623
624         return 0;
625 }
626
627 #ifdef CONFIG_PM_SLEEP
628 static int imx_thermal_suspend(struct device *dev)
629 {
630         struct imx_thermal_data *data = dev_get_drvdata(dev);
631         struct regmap *map = data->tempmon;
632
633         /*
634          * Need to disable thermal sensor, otherwise, when thermal core
635          * try to get temperature before thermal sensor resume, a wrong
636          * temperature will be read as the thermal sensor is powered
637          * down.
638          */
639         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
640         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
641         data->mode = THERMAL_DEVICE_DISABLED;
642         clk_disable_unprepare(data->thermal_clk);
643
644         return 0;
645 }
646
647 static int imx_thermal_resume(struct device *dev)
648 {
649         struct imx_thermal_data *data = dev_get_drvdata(dev);
650         struct regmap *map = data->tempmon;
651
652         clk_prepare_enable(data->thermal_clk);
653         /* Enabled thermal sensor after resume */
654         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
655         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
656         data->mode = THERMAL_DEVICE_ENABLED;
657
658         return 0;
659 }
660 #endif
661
662 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
663                          imx_thermal_suspend, imx_thermal_resume);
664
665 static struct platform_driver imx_thermal = {
666         .driver = {
667                 .name   = "imx_thermal",
668                 .pm     = &imx_thermal_pm_ops,
669                 .of_match_table = of_imx_thermal_match,
670         },
671         .probe          = imx_thermal_probe,
672         .remove         = imx_thermal_remove,
673 };
674 module_platform_driver(imx_thermal);
675
676 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
677 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
678 MODULE_LICENSE("GPL v2");
679 MODULE_ALIAS("platform:imx-thermal");