Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux
[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/cpufreq.h>
12 #include <linux/cpu_cooling.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_MEM0                      0x0480
60 #define OCOTP_ANA1                      0x04e0
61
62 /* The driver supports 1 passive trip point and 1 critical trip point */
63 enum imx_thermal_trip {
64         IMX_TRIP_PASSIVE,
65         IMX_TRIP_CRITICAL,
66         IMX_TRIP_NUM,
67 };
68
69 #define IMX_POLLING_DELAY               2000 /* millisecond */
70 #define IMX_PASSIVE_DELAY               1000
71
72 #define FACTOR0                         10000000
73 #define FACTOR1                         15976
74 #define FACTOR2                         4297157
75
76 #define TEMPMON_IMX6Q                   1
77 #define TEMPMON_IMX6SX                  2
78
79 struct thermal_soc_data {
80         u32 version;
81 };
82
83 static struct thermal_soc_data thermal_imx6q_data = {
84         .version = TEMPMON_IMX6Q,
85 };
86
87 static struct thermal_soc_data thermal_imx6sx_data = {
88         .version = TEMPMON_IMX6SX,
89 };
90
91 struct imx_thermal_data {
92         struct cpufreq_policy *policy;
93         struct thermal_zone_device *tz;
94         struct thermal_cooling_device *cdev;
95         enum thermal_device_mode mode;
96         struct regmap *tempmon;
97         u32 c1, c2; /* See formula in imx_get_sensor_data() */
98         int temp_passive;
99         int temp_critical;
100         int temp_max;
101         int alarm_temp;
102         int last_temp;
103         bool irq_enabled;
104         int irq;
105         struct clk *thermal_clk;
106         const struct thermal_soc_data *socdata;
107         const char *temp_grade;
108 };
109
110 static void imx_set_panic_temp(struct imx_thermal_data *data,
111                                int panic_temp)
112 {
113         struct regmap *map = data->tempmon;
114         int critical_value;
115
116         critical_value = (data->c2 - panic_temp) / data->c1;
117         regmap_write(map, TEMPSENSE2 + REG_CLR, TEMPSENSE2_PANIC_VALUE_MASK);
118         regmap_write(map, TEMPSENSE2 + REG_SET, critical_value <<
119                         TEMPSENSE2_PANIC_VALUE_SHIFT);
120 }
121
122 static void imx_set_alarm_temp(struct imx_thermal_data *data,
123                                int alarm_temp)
124 {
125         struct regmap *map = data->tempmon;
126         int alarm_value;
127
128         data->alarm_temp = alarm_temp;
129         alarm_value = (data->c2 - alarm_temp) / data->c1;
130         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_ALARM_VALUE_MASK);
131         regmap_write(map, TEMPSENSE0 + REG_SET, alarm_value <<
132                         TEMPSENSE0_ALARM_VALUE_SHIFT);
133 }
134
135 static int imx_get_temp(struct thermal_zone_device *tz, int *temp)
136 {
137         struct imx_thermal_data *data = tz->devdata;
138         struct regmap *map = data->tempmon;
139         unsigned int n_meas;
140         bool wait;
141         u32 val;
142
143         if (data->mode == THERMAL_DEVICE_ENABLED) {
144                 /* Check if a measurement is currently in progress */
145                 regmap_read(map, TEMPSENSE0, &val);
146                 wait = !(val & TEMPSENSE0_FINISHED);
147         } else {
148                 /*
149                  * Every time we measure the temperature, we will power on the
150                  * temperature sensor, enable measurements, take a reading,
151                  * disable measurements, power off the temperature sensor.
152                  */
153                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
154                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
155
156                 wait = true;
157         }
158
159         /*
160          * According to the temp sensor designers, it may require up to ~17us
161          * to complete a measurement.
162          */
163         if (wait)
164                 usleep_range(20, 50);
165
166         regmap_read(map, TEMPSENSE0, &val);
167
168         if (data->mode != THERMAL_DEVICE_ENABLED) {
169                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
170                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
171         }
172
173         if ((val & TEMPSENSE0_FINISHED) == 0) {
174                 dev_dbg(&tz->device, "temp measurement never finished\n");
175                 return -EAGAIN;
176         }
177
178         n_meas = (val & TEMPSENSE0_TEMP_CNT_MASK) >> TEMPSENSE0_TEMP_CNT_SHIFT;
179
180         /* See imx_get_sensor_data() for formula derivation */
181         *temp = data->c2 - n_meas * data->c1;
182
183         /* Update alarm value to next higher trip point for TEMPMON_IMX6Q */
184         if (data->socdata->version == TEMPMON_IMX6Q) {
185                 if (data->alarm_temp == data->temp_passive &&
186                         *temp >= data->temp_passive)
187                         imx_set_alarm_temp(data, data->temp_critical);
188                 if (data->alarm_temp == data->temp_critical &&
189                         *temp < data->temp_passive) {
190                         imx_set_alarm_temp(data, data->temp_passive);
191                         dev_dbg(&tz->device, "thermal alarm off: T < %d\n",
192                                 data->alarm_temp / 1000);
193                 }
194         }
195
196         if (*temp != data->last_temp) {
197                 dev_dbg(&tz->device, "millicelsius: %d\n", *temp);
198                 data->last_temp = *temp;
199         }
200
201         /* Reenable alarm IRQ if temperature below alarm temperature */
202         if (!data->irq_enabled && *temp < data->alarm_temp) {
203                 data->irq_enabled = true;
204                 enable_irq(data->irq);
205         }
206
207         return 0;
208 }
209
210 static int imx_get_mode(struct thermal_zone_device *tz,
211                         enum thermal_device_mode *mode)
212 {
213         struct imx_thermal_data *data = tz->devdata;
214
215         *mode = data->mode;
216
217         return 0;
218 }
219
220 static int imx_set_mode(struct thermal_zone_device *tz,
221                         enum thermal_device_mode mode)
222 {
223         struct imx_thermal_data *data = tz->devdata;
224         struct regmap *map = data->tempmon;
225
226         if (mode == THERMAL_DEVICE_ENABLED) {
227                 tz->polling_delay = IMX_POLLING_DELAY;
228                 tz->passive_delay = IMX_PASSIVE_DELAY;
229
230                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
231                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
232
233                 if (!data->irq_enabled) {
234                         data->irq_enabled = true;
235                         enable_irq(data->irq);
236                 }
237         } else {
238                 regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
239                 regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
240
241                 tz->polling_delay = 0;
242                 tz->passive_delay = 0;
243
244                 if (data->irq_enabled) {
245                         disable_irq(data->irq);
246                         data->irq_enabled = false;
247                 }
248         }
249
250         data->mode = mode;
251         thermal_zone_device_update(tz, THERMAL_EVENT_UNSPECIFIED);
252
253         return 0;
254 }
255
256 static int imx_get_trip_type(struct thermal_zone_device *tz, int trip,
257                              enum thermal_trip_type *type)
258 {
259         *type = (trip == IMX_TRIP_PASSIVE) ? THERMAL_TRIP_PASSIVE :
260                                              THERMAL_TRIP_CRITICAL;
261         return 0;
262 }
263
264 static int imx_get_crit_temp(struct thermal_zone_device *tz, int *temp)
265 {
266         struct imx_thermal_data *data = tz->devdata;
267
268         *temp = data->temp_critical;
269         return 0;
270 }
271
272 static int imx_get_trip_temp(struct thermal_zone_device *tz, int trip,
273                              int *temp)
274 {
275         struct imx_thermal_data *data = tz->devdata;
276
277         *temp = (trip == IMX_TRIP_PASSIVE) ? data->temp_passive :
278                                              data->temp_critical;
279         return 0;
280 }
281
282 static int imx_set_trip_temp(struct thermal_zone_device *tz, int trip,
283                              int temp)
284 {
285         struct imx_thermal_data *data = tz->devdata;
286
287         /* do not allow changing critical threshold */
288         if (trip == IMX_TRIP_CRITICAL)
289                 return -EPERM;
290
291         /* do not allow passive to be set higher than critical */
292         if (temp < 0 || temp > data->temp_critical)
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                                                THERMAL_WEIGHT_DEFAULT);
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         /* use OTP for thermal grade */
409         ret = regmap_read(map, OCOTP_MEM0, &val);
410         if (ret) {
411                 dev_err(&pdev->dev, "failed to read temp grade: %d\n", ret);
412                 return ret;
413         }
414
415         /* The maximum die temp is specified by the Temperature Grade */
416         switch ((val >> 6) & 0x3) {
417         case 0: /* Commercial (0 to 95C) */
418                 data->temp_grade = "Commercial";
419                 data->temp_max = 95000;
420                 break;
421         case 1: /* Extended Commercial (-20 to 105C) */
422                 data->temp_grade = "Extended Commercial";
423                 data->temp_max = 105000;
424                 break;
425         case 2: /* Industrial (-40 to 105C) */
426                 data->temp_grade = "Industrial";
427                 data->temp_max = 105000;
428                 break;
429         case 3: /* Automotive (-40 to 125C) */
430                 data->temp_grade = "Automotive";
431                 data->temp_max = 125000;
432                 break;
433         }
434
435         /*
436          * Set the critical trip point at 5C under max
437          * Set the passive trip point at 10C under max (can change via sysfs)
438          */
439         data->temp_critical = data->temp_max - (1000 * 5);
440         data->temp_passive = data->temp_max - (1000 * 10);
441
442         return 0;
443 }
444
445 static irqreturn_t imx_thermal_alarm_irq(int irq, void *dev)
446 {
447         struct imx_thermal_data *data = dev;
448
449         disable_irq_nosync(irq);
450         data->irq_enabled = false;
451
452         return IRQ_WAKE_THREAD;
453 }
454
455 static irqreturn_t imx_thermal_alarm_irq_thread(int irq, void *dev)
456 {
457         struct imx_thermal_data *data = dev;
458
459         dev_dbg(&data->tz->device, "THERMAL ALARM: T > %d\n",
460                 data->alarm_temp / 1000);
461
462         thermal_zone_device_update(data->tz, THERMAL_EVENT_UNSPECIFIED);
463
464         return IRQ_HANDLED;
465 }
466
467 static const struct of_device_id of_imx_thermal_match[] = {
468         { .compatible = "fsl,imx6q-tempmon", .data = &thermal_imx6q_data, },
469         { .compatible = "fsl,imx6sx-tempmon", .data = &thermal_imx6sx_data, },
470         { /* end */ }
471 };
472 MODULE_DEVICE_TABLE(of, of_imx_thermal_match);
473
474 static int imx_thermal_probe(struct platform_device *pdev)
475 {
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_device_get_match_data(&pdev->dev);
494         if (!data->socdata) {
495                 dev_err(&pdev->dev, "no device match found\n");
496                 return -ENODEV;
497         }
498
499         /* make sure the IRQ flag is clear before enabling irq on i.MX6SX */
500         if (data->socdata->version == TEMPMON_IMX6SX) {
501                 regmap_write(map, MISC1 + REG_CLR, MISC1_IRQ_TEMPHIGH |
502                         MISC1_IRQ_TEMPLOW | MISC1_IRQ_TEMPPANIC);
503                 /*
504                  * reset value of LOW ALARM is incorrect, set it to lowest
505                  * value to avoid false trigger of low alarm.
506                  */
507                 regmap_write(map, TEMPSENSE2 + REG_SET,
508                         TEMPSENSE2_LOW_VALUE_MASK);
509         }
510
511         data->irq = platform_get_irq(pdev, 0);
512         if (data->irq < 0)
513                 return data->irq;
514
515         platform_set_drvdata(pdev, data);
516
517         ret = imx_get_sensor_data(pdev);
518         if (ret) {
519                 dev_err(&pdev->dev, "failed to get sensor data\n");
520                 return ret;
521         }
522
523         /* Make sure sensor is in known good state for measurements */
524         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
525         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
526         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
527         regmap_write(map, MISC0 + REG_SET, MISC0_REFTOP_SELBIASOFF);
528         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
529
530         data->policy = cpufreq_cpu_get(0);
531         if (!data->policy) {
532                 pr_debug("%s: CPUFreq policy not found\n", __func__);
533                 return -EPROBE_DEFER;
534         }
535
536         data->cdev = cpufreq_cooling_register(data->policy);
537         if (IS_ERR(data->cdev)) {
538                 ret = PTR_ERR(data->cdev);
539                 dev_err(&pdev->dev,
540                         "failed to register cpufreq cooling device: %d\n", ret);
541                 cpufreq_cpu_put(data->policy);
542                 return ret;
543         }
544
545         data->thermal_clk = devm_clk_get(&pdev->dev, NULL);
546         if (IS_ERR(data->thermal_clk)) {
547                 ret = PTR_ERR(data->thermal_clk);
548                 if (ret != -EPROBE_DEFER)
549                         dev_err(&pdev->dev,
550                                 "failed to get thermal clk: %d\n", ret);
551                 cpufreq_cooling_unregister(data->cdev);
552                 cpufreq_cpu_put(data->policy);
553                 return ret;
554         }
555
556         /*
557          * Thermal sensor needs clk on to get correct value, normally
558          * we should enable its clk before taking measurement and disable
559          * clk after measurement is done, but if alarm function is enabled,
560          * hardware will auto measure the temperature periodically, so we
561          * need to keep the clk always on for alarm function.
562          */
563         ret = clk_prepare_enable(data->thermal_clk);
564         if (ret) {
565                 dev_err(&pdev->dev, "failed to enable thermal clk: %d\n", ret);
566                 cpufreq_cooling_unregister(data->cdev);
567                 cpufreq_cpu_put(data->policy);
568                 return ret;
569         }
570
571         data->tz = thermal_zone_device_register("imx_thermal_zone",
572                                                 IMX_TRIP_NUM,
573                                                 BIT(IMX_TRIP_PASSIVE), data,
574                                                 &imx_tz_ops, NULL,
575                                                 IMX_PASSIVE_DELAY,
576                                                 IMX_POLLING_DELAY);
577         if (IS_ERR(data->tz)) {
578                 ret = PTR_ERR(data->tz);
579                 dev_err(&pdev->dev,
580                         "failed to register thermal zone device %d\n", ret);
581                 clk_disable_unprepare(data->thermal_clk);
582                 cpufreq_cooling_unregister(data->cdev);
583                 cpufreq_cpu_put(data->policy);
584                 return ret;
585         }
586
587         dev_info(&pdev->dev, "%s CPU temperature grade - max:%dC"
588                  " critical:%dC passive:%dC\n", data->temp_grade,
589                  data->temp_max / 1000, data->temp_critical / 1000,
590                  data->temp_passive / 1000);
591
592         /* Enable measurements at ~ 10 Hz */
593         regmap_write(map, TEMPSENSE1 + REG_CLR, TEMPSENSE1_MEASURE_FREQ);
594         measure_freq = DIV_ROUND_UP(32768, 10); /* 10 Hz */
595         regmap_write(map, TEMPSENSE1 + REG_SET, measure_freq);
596         imx_set_alarm_temp(data, data->temp_passive);
597
598         if (data->socdata->version == TEMPMON_IMX6SX)
599                 imx_set_panic_temp(data, data->temp_critical);
600
601         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
602         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
603
604         ret = devm_request_threaded_irq(&pdev->dev, data->irq,
605                         imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread,
606                         0, "imx_thermal", data);
607         if (ret < 0) {
608                 dev_err(&pdev->dev, "failed to request alarm irq: %d\n", ret);
609                 clk_disable_unprepare(data->thermal_clk);
610                 thermal_zone_device_unregister(data->tz);
611                 cpufreq_cooling_unregister(data->cdev);
612                 cpufreq_cpu_put(data->policy);
613                 return ret;
614         }
615
616         data->irq_enabled = true;
617         data->mode = THERMAL_DEVICE_ENABLED;
618
619         return 0;
620 }
621
622 static int imx_thermal_remove(struct platform_device *pdev)
623 {
624         struct imx_thermal_data *data = platform_get_drvdata(pdev);
625         struct regmap *map = data->tempmon;
626
627         /* Disable measurements */
628         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
629         if (!IS_ERR(data->thermal_clk))
630                 clk_disable_unprepare(data->thermal_clk);
631
632         thermal_zone_device_unregister(data->tz);
633         cpufreq_cooling_unregister(data->cdev);
634         cpufreq_cpu_put(data->policy);
635
636         return 0;
637 }
638
639 #ifdef CONFIG_PM_SLEEP
640 static int imx_thermal_suspend(struct device *dev)
641 {
642         struct imx_thermal_data *data = dev_get_drvdata(dev);
643         struct regmap *map = data->tempmon;
644
645         /*
646          * Need to disable thermal sensor, otherwise, when thermal core
647          * try to get temperature before thermal sensor resume, a wrong
648          * temperature will be read as the thermal sensor is powered
649          * down.
650          */
651         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_MEASURE_TEMP);
652         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_POWER_DOWN);
653         data->mode = THERMAL_DEVICE_DISABLED;
654         clk_disable_unprepare(data->thermal_clk);
655
656         return 0;
657 }
658
659 static int imx_thermal_resume(struct device *dev)
660 {
661         struct imx_thermal_data *data = dev_get_drvdata(dev);
662         struct regmap *map = data->tempmon;
663         int ret;
664
665         ret = clk_prepare_enable(data->thermal_clk);
666         if (ret)
667                 return ret;
668         /* Enabled thermal sensor after resume */
669         regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN);
670         regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP);
671         data->mode = THERMAL_DEVICE_ENABLED;
672
673         return 0;
674 }
675 #endif
676
677 static SIMPLE_DEV_PM_OPS(imx_thermal_pm_ops,
678                          imx_thermal_suspend, imx_thermal_resume);
679
680 static struct platform_driver imx_thermal = {
681         .driver = {
682                 .name   = "imx_thermal",
683                 .pm     = &imx_thermal_pm_ops,
684                 .of_match_table = of_imx_thermal_match,
685         },
686         .probe          = imx_thermal_probe,
687         .remove         = imx_thermal_remove,
688 };
689 module_platform_driver(imx_thermal);
690
691 MODULE_AUTHOR("Freescale Semiconductor, Inc.");
692 MODULE_DESCRIPTION("Thermal driver for Freescale i.MX SoCs");
693 MODULE_LICENSE("GPL v2");
694 MODULE_ALIAS("platform:imx-thermal");