aboutsummaryrefslogtreecommitdiff
path: root/drivers/thermal/exynos_thermal.c
blob: e04ebd8671aca27dc390c32d6ec00d6033c7d7ae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
/*
 * exynos_thermal.c - Samsung EXYNOS TMU (Thermal Management Unit)
 *
 *  Copyright (C) 2011 Samsung Electronics
 *  Donggeun Kim <dg77.kim@samsung.com>
 *  Amit Daniel Kachhap <amit.kachhap@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/module.h>
#include <linux/err.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/workqueue.h>
#include <linux/sysfs.h>
#include <linux/kobject.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <linux/platform_data/exynos_thermal.h>
#include <linux/thermal.h>
#include <linux/cpufreq.h>
#include <linux/cpu_cooling.h>
#include <linux/of.h>

#include <plat/cpu.h>

/* Exynos generic registers */
#define EXYNOS_TMU_REG_TRIMINFO		0x0
#define EXYNOS_TMU_REG_CONTROL		0x20
#define EXYNOS_TMU_REG_STATUS		0x28
#define EXYNOS_TMU_REG_CURRENT_TEMP	0x40
#define EXYNOS_TMU_REG_INTEN		0x70
#define EXYNOS_TMU_REG_INTSTAT		0x74
#define EXYNOS_TMU_REG_INTCLEAR		0x78

#define EXYNOS_TMU_TRIM_TEMP_MASK	0xff
#define EXYNOS_TMU_GAIN_SHIFT		8
#define EXYNOS_TMU_REF_VOLTAGE_SHIFT	24
#define EXYNOS_TMU_CORE_ON		3
#define EXYNOS_TMU_CORE_OFF		2
#define EXYNOS_TMU_DEF_CODE_TO_TEMP_OFFSET	50

/* Exynos4210 specific registers */
#define EXYNOS4210_TMU_REG_THRESHOLD_TEMP	0x44
#define EXYNOS4210_TMU_REG_TRIG_LEVEL0	0x50
#define EXYNOS4210_TMU_REG_TRIG_LEVEL1	0x54
#define EXYNOS4210_TMU_REG_TRIG_LEVEL2	0x58
#define EXYNOS4210_TMU_REG_TRIG_LEVEL3	0x5C
#define EXYNOS4210_TMU_REG_PAST_TEMP0	0x60
#define EXYNOS4210_TMU_REG_PAST_TEMP1	0x64
#define EXYNOS4210_TMU_REG_PAST_TEMP2	0x68
#define EXYNOS4210_TMU_REG_PAST_TEMP3	0x6C

#define EXYNOS4210_TMU_TRIG_LEVEL0_MASK	0x1
#define EXYNOS4210_TMU_TRIG_LEVEL1_MASK	0x10
#define EXYNOS4210_TMU_TRIG_LEVEL2_MASK	0x100
#define EXYNOS4210_TMU_TRIG_LEVEL3_MASK	0x1000
#define EXYNOS4210_TMU_INTCLEAR_VAL	0x1111

/* Exynos5250 and Exynos4412 specific registers */
#define EXYNOS_TMU_TRIMINFO_CON	0x14
#define EXYNOS_THD_TEMP_RISE		0x50
#define EXYNOS_THD_TEMP_FALL		0x54
#define EXYNOS_EMUL_CON		0x80

#define EXYNOS_TRIMINFO_RELOAD		0x1
#define EXYNOS_TMU_CLEAR_RISE_INT	0x111
#define EXYNOS_TMU_CLEAR_FALL_INT	(0x111 << 12)
#define EXYNOS_MUX_ADDR_VALUE		6
#define EXYNOS_MUX_ADDR_SHIFT		20
#define EXYNOS_TMU_TRIP_MODE_SHIFT	13

#define EFUSE_MIN_VALUE 40
#define EFUSE_MAX_VALUE 100

/* In-kernel thermal framework related macros & definations */
#define SENSOR_NAME_LEN	16
#define MAX_TRIP_COUNT	8
#define MAX_COOLING_DEVICE 4
#define MAX_THRESHOLD_LEVS 4

#define ACTIVE_INTERVAL 500
#define IDLE_INTERVAL 10000
#define MCELSIUS	1000

#ifdef CONFIG_EXYNOS_THERMAL_EMUL
#define EXYNOS_EMUL_TIME	0x57F0
#define EXYNOS_EMUL_TIME_SHIFT	16
#define EXYNOS_EMUL_DATA_SHIFT	8
#define EXYNOS_EMUL_DATA_MASK	0xFF
#define EXYNOS_EMUL_ENABLE	0x1
#endif /* CONFIG_EXYNOS_THERMAL_EMUL */

/* CPU Zone information */
#define PANIC_ZONE      4
#define WARN_ZONE       3
#define MONITOR_ZONE    2
#define SAFE_ZONE       1

#define GET_ZONE(trip) (trip + 2)
#define GET_TRIP(zone) (zone - 2)

#define EXYNOS_ZONE_COUNT	3

struct exynos_tmu_data {
	struct exynos_tmu_platform_data *pdata;
	struct resource *mem;
	void __iomem *base;
	int irq;
	enum soc_type soc;
	struct work_struct irq_work;
	struct mutex lock;
	struct clk *clk;
	u8 temp_error1, temp_error2;
};

struct	thermal_trip_point_conf {
	int trip_val[MAX_TRIP_COUNT];
	int trip_count;
	u8 trigger_falling;
};

struct	thermal_cooling_conf {
	struct freq_clip_table freq_data[MAX_TRIP_COUNT];
	int freq_clip_count;
};

struct thermal_sensor_conf {
	char name[SENSOR_NAME_LEN];
	int (*read_temperature)(void *data);
	struct thermal_trip_point_conf trip_data;
	struct thermal_cooling_conf cooling_data;
	void *private_data;
};

struct exynos_thermal_zone {
	enum thermal_device_mode mode;
	struct thermal_zone_device *therm_dev;
	struct thermal_cooling_device *cool_dev[MAX_COOLING_DEVICE];
	unsigned int cool_dev_size;
	struct platform_device *exynos4_dev;
	struct thermal_sensor_conf *sensor_conf;
	bool bind;
};

static struct exynos_thermal_zone *th_zone;
static void exynos_unregister_thermal(void);
static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf);

/* Get mode callback functions for thermal zone */
static int exynos_get_mode(struct thermal_zone_device *thermal,
			enum thermal_device_mode *mode)
{
	if (th_zone)
		*mode = th_zone->mode;
	return 0;
}

/* Set mode callback functions for thermal zone */
static int exynos_set_mode(struct thermal_zone_device *thermal,
			enum thermal_device_mode mode)
{
	if (!th_zone->therm_dev) {
		pr_notice("thermal zone not registered\n");
		return 0;
	}

	mutex_lock(&th_zone->therm_dev->lock);

	if (mode == THERMAL_DEVICE_ENABLED &&
		!th_zone->sensor_conf->trip_data.trigger_falling)
		th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
	else
		th_zone->therm_dev->polling_delay = 0;

	mutex_unlock(&th_zone->therm_dev->lock);

	th_zone->mode = mode;
	thermal_zone_device_update(th_zone->therm_dev);
	pr_info("thermal polling set for duration=%d msec\n",
				th_zone->therm_dev->polling_delay);
	return 0;
}


/* Get trip type callback functions for thermal zone */
static int exynos_get_trip_type(struct thermal_zone_device *thermal, int trip,
				 enum thermal_trip_type *type)
{
	switch (GET_ZONE(trip)) {
	case MONITOR_ZONE:
	case WARN_ZONE:
		*type = THERMAL_TRIP_ACTIVE;
		break;
	case PANIC_ZONE:
		*type = THERMAL_TRIP_CRITICAL;
		break;
	default:
		return -EINVAL;
	}
	return 0;
}

/* Get trip temperature callback functions for thermal zone */
static int exynos_get_trip_temp(struct thermal_zone_device *thermal, int trip,
				unsigned long *temp)
{
	if (trip < GET_TRIP(MONITOR_ZONE) || trip > GET_TRIP(PANIC_ZONE))
		return -EINVAL;

	*temp = th_zone->sensor_conf->trip_data.trip_val[trip];
	/* convert the temperature into millicelsius */
	*temp = *temp * MCELSIUS;

	return 0;
}

/* Get critical temperature callback functions for thermal zone */
static int exynos_get_crit_temp(struct thermal_zone_device *thermal,
				unsigned long *temp)
{
	int ret;
	/* Panic zone */
	ret = exynos_get_trip_temp(thermal, GET_TRIP(PANIC_ZONE), temp);
	return ret;
}

static int exynos_get_frequency_level(unsigned int cpu, unsigned int freq)
{
	int i = 0, ret = -EINVAL;
	struct cpufreq_frequency_table *table = NULL;
#ifdef CONFIG_CPU_FREQ
	table = cpufreq_frequency_get_table(cpu);
#endif
	if (!table)
		return ret;

	while (table[i].frequency != CPUFREQ_TABLE_END) {
		if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
			continue;
		if (table[i].frequency == freq)
			return i;
		i++;
	}
	return ret;
}

/* Bind callback functions for thermal zone */
static int exynos_bind(struct thermal_zone_device *thermal,
			struct thermal_cooling_device *cdev)
{
	int ret = 0, i, tab_size, level;
	struct freq_clip_table *tab_ptr, *clip_data;
	struct thermal_sensor_conf *data = th_zone->sensor_conf;

	tab_ptr = (struct freq_clip_table *)data->cooling_data.freq_data;
	tab_size = data->cooling_data.freq_clip_count;

	if (tab_ptr == NULL || tab_size == 0)
		return -EINVAL;

	/* find the cooling device registered*/
	for (i = 0; i < th_zone->cool_dev_size; i++)
		if (cdev == th_zone->cool_dev[i])
			break;

	/* No matching cooling device */
	if (i == th_zone->cool_dev_size)
		return 0;

	/* Bind the thermal zone to the cpufreq cooling device */
	for (i = 0; i < tab_size; i++) {
		clip_data = (struct freq_clip_table *)&(tab_ptr[i]);
		level = exynos_get_frequency_level(0, clip_data->freq_clip_max);
		if (level < 0)
			return 0;
		switch (GET_ZONE(i)) {
		case MONITOR_ZONE:
		case WARN_ZONE:
			if (thermal_zone_bind_cooling_device(thermal, i, cdev,
								level, 0)) {
				pr_err("error binding cdev inst %d\n", i);
				ret = -EINVAL;
			}
			th_zone->bind = true;
			break;
		default:
			ret = -EINVAL;
		}
	}

	return ret;
}

/* Unbind callback functions for thermal zone */
static int exynos_unbind(struct thermal_zone_device *thermal,
			struct thermal_cooling_device *cdev)
{
	int ret = 0, i, tab_size;
	struct thermal_sensor_conf *data = th_zone->sensor_conf;

	if (th_zone->bind == false)
		return 0;

	tab_size = data->cooling_data.freq_clip_count;

	if (tab_size == 0)
		return -EINVAL;

	/* find the cooling device registered*/
	for (i = 0; i < th_zone->cool_dev_size; i++)
		if (cdev == th_zone->cool_dev[i])
			break;

	/* No matching cooling device */
	if (i == th_zone->cool_dev_size)
		return 0;

	/* Bind the thermal zone to the cpufreq cooling device */
	for (i = 0; i < tab_size; i++) {
		switch (GET_ZONE(i)) {
		case MONITOR_ZONE:
		case WARN_ZONE:
			if (thermal_zone_unbind_cooling_device(thermal, i,
								cdev)) {
				pr_err("error unbinding cdev inst=%d\n", i);
				ret = -EINVAL;
			}
			th_zone->bind = false;
			break;
		default:
			ret = -EINVAL;
		}
	}
	return ret;
}

/* Get temperature callback functions for thermal zone */
static int exynos_get_temp(struct thermal_zone_device *thermal,
			unsigned long *temp)
{
	void *data;

	if (!th_zone->sensor_conf) {
		pr_info("Temperature sensor not initialised\n");
		return -EINVAL;
	}
	data = th_zone->sensor_conf->private_data;
	*temp = th_zone->sensor_conf->read_temperature(data);
	/* convert the temperature into millicelsius */
	*temp = *temp * MCELSIUS;
	return 0;
}

/* Get the temperature trend */
static int exynos_get_trend(struct thermal_zone_device *thermal,
			int trip, enum thermal_trend *trend)
{
	int ret;
	unsigned long trip_temp;

	ret = exynos_get_trip_temp(thermal, trip, &trip_temp);
	if (ret < 0)
		return ret;

	if (thermal->temperature >= trip_temp)
		*trend = THERMAL_TREND_RAISE_FULL;
	else
		*trend = THERMAL_TREND_DROP_FULL;

	return 0;
}
/* Operation callback functions for thermal zone */
static struct thermal_zone_device_ops const exynos_dev_ops = {
	.bind = exynos_bind,
	.unbind = exynos_unbind,
	.get_temp = exynos_get_temp,
	.get_trend = exynos_get_trend,
	.get_mode = exynos_get_mode,
	.set_mode = exynos_set_mode,
	.get_trip_type = exynos_get_trip_type,
	.get_trip_temp = exynos_get_trip_temp,
	.get_crit_temp = exynos_get_crit_temp,
};

/*
 * This function may be called from interrupt based temperature sensor
 * when threshold is changed.
 */
static void exynos_report_trigger(void)
{
	unsigned int i;
	char data[10];
	char *envp[] = { data, NULL };

	if (!th_zone || !th_zone->therm_dev)
		return;
	if (th_zone->bind == false) {
		for (i = 0; i < th_zone->cool_dev_size; i++) {
			if (!th_zone->cool_dev[i])
				continue;
			exynos_bind(th_zone->therm_dev,
					th_zone->cool_dev[i]);
		}
	}

	thermal_zone_device_update(th_zone->therm_dev);

	mutex_lock(&th_zone->therm_dev->lock);
	/* Find the level for which trip happened */
	for (i = 0; i < th_zone->sensor_conf->trip_data.trip_count; i++) {
		if (th_zone->therm_dev->last_temperature <
			th_zone->sensor_conf->trip_data.trip_val[i] * MCELSIUS)
			break;
	}

	if (th_zone->mode == THERMAL_DEVICE_ENABLED &&
		!th_zone->sensor_conf->trip_data.trigger_falling) {
		if (i > 0)
			th_zone->therm_dev->polling_delay = ACTIVE_INTERVAL;
		else
			th_zone->therm_dev->polling_delay = IDLE_INTERVAL;
	}

	snprintf(data, sizeof(data), "%u", i);
	kobject_uevent_env(&th_zone->therm_dev->device.kobj, KOBJ_CHANGE, envp);
	mutex_unlock(&th_zone->therm_dev->lock);
}

/* Register with the in-kernel thermal management */
static int exynos_register_thermal(struct thermal_sensor_conf *sensor_conf)
{
	int ret;
	struct cpumask mask_val;

	if (!sensor_conf || !sensor_conf->read_temperature) {
		pr_err("Temperature sensor not initialised\n");
		return -EINVAL;
	}

	th_zone = kzalloc(sizeof(struct exynos_thermal_zone), GFP_KERNEL);
	if (!th_zone)
		return -ENOMEM;

	th_zone->sensor_conf = sensor_conf;
	cpumask_set_cpu(0, &mask_val);
	th_zone->cool_dev[0] = cpufreq_cooling_register(&mask_val);
	if (IS_ERR(th_zone->cool_dev[0])) {
		pr_err("Failed to register cpufreq cooling device\n");
		ret = -EINVAL;
		goto err_unregister;
	}
	th_zone->cool_dev_size++;

	th_zone->therm_dev = thermal_zone_device_register(sensor_conf->name,
			EXYNOS_ZONE_COUNT, 0, NULL, &exynos_dev_ops, NULL, 0,
			sensor_conf->trip_data.trigger_falling ?
			0 : IDLE_INTERVAL);

	if (IS_ERR(th_zone->therm_dev)) {
		pr_err("Failed to register thermal zone device\n");
		ret = -EINVAL;
		goto err_unregister;
	}
	th_zone->mode = THERMAL_DEVICE_ENABLED;

	pr_info("Exynos: Kernel Thermal management registered\n");

	return 0;

err_unregister:
	exynos_unregister_thermal();
	return ret;
}

/* Un-Register with the in-kernel thermal management */
static void exynos_unregister_thermal(void)
{
	int i;

	if (!th_zone)
		return;

	if (th_zone->therm_dev)
		thermal_zone_device_unregister(th_zone->therm_dev);

	for (i = 0; i < th_zone->cool_dev_size; i++) {
		if (th_zone->cool_dev[i])
			cpufreq_cooling_unregister(th_zone->cool_dev[i]);
	}

	kfree(th_zone);
	pr_info("Exynos: Kernel Thermal management unregistered\n");
}

/*
 * TMU treats temperature as a mapped temperature code.
 * The temperature is converted differently depending on the calibration type.
 */
static int temp_to_code(struct exynos_tmu_data *data, u8 temp)
{
	struct exynos_tmu_platform_data *pdata = data->pdata;
	int temp_code;

	if (data->soc == SOC_ARCH_EXYNOS4210)
		/* temp should range between 25 and 125 */
		if (temp < 25 || temp > 125) {
			temp_code = -EINVAL;
			goto out;
		}

	switch (pdata->cal_type) {
	case TYPE_TWO_POINT_TRIMMING:
		temp_code = (temp - 25) *
		    (data->temp_error2 - data->temp_error1) /
		    (85 - 25) + data->temp_error1;
		break;
	case TYPE_ONE_POINT_TRIMMING:
		temp_code = temp + data->temp_error1 - 25;
		break;
	default:
		temp_code = temp + EXYNOS_TMU_DEF_CODE_TO_TEMP_OFFSET;
		break;
	}
out:
	return temp_code;
}

/*
 * Calculate a temperature value from a temperature code.
 * The unit of the temperature is degree Celsius.
 */
static int code_to_temp(struct exynos_tmu_data *data, u8 temp_code)
{
	struct exynos_tmu_platform_data *pdata = data->pdata;
	int temp;

	if (data->soc == SOC_ARCH_EXYNOS4210)
		/* temp_code should range between 75 and 175 */
		if (temp_code < 75 || temp_code > 175) {
			temp = -ENODATA;
			goto out;
		}

	switch (pdata->cal_type) {
	case TYPE_TWO_POINT_TRIMMING:
		temp = (temp_code - data->temp_error1) * (85 - 25) /
		    (data->temp_error2 - data->temp_error1) + 25;
		break;
	case TYPE_ONE_POINT_TRIMMING:
		temp = temp_code - data->temp_error1 + 25;
		break;
	default:
		temp = temp_code - EXYNOS_TMU_DEF_CODE_TO_TEMP_OFFSET;
		break;
	}
out:
	return temp;
}

static int exynos_tmu_initialize(struct platform_device *pdev)
{
	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
	struct exynos_tmu_platform_data *pdata = data->pdata;
	unsigned int status, trim_info;
	unsigned int rising_threshold = 0, falling_threshold = 0;
	int ret = 0, threshold_code, i, trigger_levs = 0;

	mutex_lock(&data->lock);
	clk_enable(data->clk);

	status = readb(data->base + EXYNOS_TMU_REG_STATUS);
	if (!status) {
		ret = -EBUSY;
		goto out;
	}

	if (data->soc == SOC_ARCH_EXYNOS) {
		__raw_writel(EXYNOS_TRIMINFO_RELOAD,
				data->base + EXYNOS_TMU_TRIMINFO_CON);
	}
	/* Save trimming info in order to perform calibration */
	trim_info = readl(data->base + EXYNOS_TMU_REG_TRIMINFO);
	data->temp_error1 = trim_info & EXYNOS_TMU_TRIM_TEMP_MASK;
	data->temp_error2 = ((trim_info >> 8) & EXYNOS_TMU_TRIM_TEMP_MASK);

	if ((EFUSE_MIN_VALUE > data->temp_error1) ||
			(data->temp_error1 > EFUSE_MAX_VALUE) ||
			(data->temp_error2 != 0))
		data->temp_error1 = pdata->efuse_value;

	/* Count trigger levels to be enabled */
	for (i = 0; i < MAX_THRESHOLD_LEVS; i++)
		if (pdata->trigger_levels[i])
			trigger_levs++;

	if (data->soc == SOC_ARCH_EXYNOS4210) {
		/* Write temperature code for threshold */
		threshold_code = temp_to_code(data, pdata->threshold);
		if (threshold_code < 0) {
			ret = threshold_code;
			goto out;
		}
		writeb(threshold_code,
			data->base + EXYNOS4210_TMU_REG_THRESHOLD_TEMP);
		for (i = 0; i < trigger_levs; i++)
			writeb(pdata->trigger_levels[i],
			data->base + EXYNOS4210_TMU_REG_TRIG_LEVEL0 + i * 4);

		writel(EXYNOS4210_TMU_INTCLEAR_VAL,
			data->base + EXYNOS_TMU_REG_INTCLEAR);
	} else if (data->soc == SOC_ARCH_EXYNOS) {
		/* Write temperature code for rising and falling threshold */
		for (i = 0; i < trigger_levs; i++) {
			threshold_code = temp_to_code(data,
						pdata->trigger_levels[i]);
			if (threshold_code < 0) {
				ret = threshold_code;
				goto out;
			}
			rising_threshold |= threshold_code << 8 * i;
			if (pdata->threshold_falling) {
				threshold_code = temp_to_code(data,
						pdata->trigger_levels[i] -
						pdata->threshold_falling);
				if (threshold_code > 0)
					falling_threshold |=
						threshold_code << 8 * i;
			}
		}

		writel(rising_threshold,
				data->base + EXYNOS_THD_TEMP_RISE);
		writel(falling_threshold,
				data->base + EXYNOS_THD_TEMP_FALL);

		writel(EXYNOS_TMU_CLEAR_RISE_INT | EXYNOS_TMU_CLEAR_FALL_INT,
				data->base + EXYNOS_TMU_REG_INTCLEAR);
	}
out:
	clk_disable(data->clk);
	mutex_unlock(&data->lock);

	return ret;
}

static void exynos_tmu_control(struct platform_device *pdev, bool on)
{
	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
	struct exynos_tmu_platform_data *pdata = data->pdata;
	unsigned int con, interrupt_en;

	mutex_lock(&data->lock);
	clk_enable(data->clk);

	con = pdata->reference_voltage << EXYNOS_TMU_REF_VOLTAGE_SHIFT |
		pdata->gain << EXYNOS_TMU_GAIN_SHIFT;

	if (data->soc == SOC_ARCH_EXYNOS) {
		con |= pdata->noise_cancel_mode << EXYNOS_TMU_TRIP_MODE_SHIFT;
		con |= (EXYNOS_MUX_ADDR_VALUE << EXYNOS_MUX_ADDR_SHIFT);
	}

	if (on) {
		con |= EXYNOS_TMU_CORE_ON;
		interrupt_en = pdata->trigger_level3_en << 12 |
			pdata->trigger_level2_en << 8 |
			pdata->trigger_level1_en << 4 |
			pdata->trigger_level0_en;
		if (pdata->threshold_falling)
			interrupt_en |= interrupt_en << 16;
	} else {
		con |= EXYNOS_TMU_CORE_OFF;
		interrupt_en = 0; /* Disable all interrupts */
	}
	writel(interrupt_en, data->base + EXYNOS_TMU_REG_INTEN);
	writel(con, data->base + EXYNOS_TMU_REG_CONTROL);

	clk_disable(data->clk);
	mutex_unlock(&data->lock);
}

static int exynos_tmu_read(struct exynos_tmu_data *data)
{
	u8 temp_code;
	int temp;

	mutex_lock(&data->lock);
	clk_enable(data->clk);

	temp_code = readb(data->base + EXYNOS_TMU_REG_CURRENT_TEMP);
	temp = code_to_temp(data, temp_code);

	clk_disable(data->clk);
	mutex_unlock(&data->lock);

	return temp;
}

static void exynos_tmu_work(struct work_struct *work)
{
	struct exynos_tmu_data *data = container_of(work,
			struct exynos_tmu_data, irq_work);

	exynos_report_trigger();
	mutex_lock(&data->lock);
	clk_enable(data->clk);
	if (data->soc == SOC_ARCH_EXYNOS)
		writel(EXYNOS_TMU_CLEAR_RISE_INT |
				EXYNOS_TMU_CLEAR_FALL_INT,
				data->base + EXYNOS_TMU_REG_INTCLEAR);
	else
		writel(EXYNOS4210_TMU_INTCLEAR_VAL,
				data->base + EXYNOS_TMU_REG_INTCLEAR);
	clk_disable(data->clk);
	mutex_unlock(&data->lock);

	enable_irq(data->irq);
}

static irqreturn_t exynos_tmu_irq(int irq, void *id)
{
	struct exynos_tmu_data *data = id;

	disable_irq_nosync(irq);
	schedule_work(&data->irq_work);

	return IRQ_HANDLED;
}
static struct thermal_sensor_conf exynos_sensor_conf = {
	.name			= "exynos-therm",
	.read_temperature	= (int (*)(void *))exynos_tmu_read,
};

#if defined(CONFIG_CPU_EXYNOS4210)
static struct exynos_tmu_platform_data const exynos4210_default_tmu_data = {
	.threshold = 80,
	.trigger_levels[0] = 5,
	.trigger_levels[1] = 20,
	.trigger_levels[2] = 30,
	.trigger_level0_en = 1,
	.trigger_level1_en = 1,
	.trigger_level2_en = 1,
	.trigger_level3_en = 0,
	.gain = 15,
	.reference_voltage = 7,
	.cal_type = TYPE_ONE_POINT_TRIMMING,
	.freq_tab[0] = {
		.freq_clip_max = 800 * 1000,
		.temp_level = 85,
	},
	.freq_tab[1] = {
		.freq_clip_max = 200 * 1000,
		.temp_level = 100,
	},
	.freq_tab_count = 2,
	.type = SOC_ARCH_EXYNOS4210,
};
#define EXYNOS4210_TMU_DRV_DATA (&exynos4210_default_tmu_data)
#else
#define EXYNOS4210_TMU_DRV_DATA (NULL)
#endif

#if defined(CONFIG_SOC_EXYNOS5250) || defined(CONFIG_SOC_EXYNOS4412)
static struct exynos_tmu_platform_data const exynos_default_tmu_data = {
	.threshold_falling = 10,
	.trigger_levels[0] = 85,
	.trigger_levels[1] = 103,
	.trigger_levels[2] = 110,
	.trigger_level0_en = 1,
	.trigger_level1_en = 1,
	.trigger_level2_en = 1,
	.trigger_level3_en = 0,
	.gain = 8,
	.reference_voltage = 16,
	.noise_cancel_mode = 4,
	.cal_type = TYPE_ONE_POINT_TRIMMING,
	.efuse_value = 55,
	.freq_tab[0] = {
		.freq_clip_max = 800 * 1000,
		.temp_level = 85,
	},
	.freq_tab[1] = {
		.freq_clip_max = 200 * 1000,
		.temp_level = 103,
	},
	.freq_tab_count = 2,
	.type = SOC_ARCH_EXYNOS,
};
#define EXYNOS_TMU_DRV_DATA (&exynos_default_tmu_data)
#else
#define EXYNOS_TMU_DRV_DATA (NULL)
#endif

#ifdef CONFIG_OF
static const struct of_device_id exynos_tmu_match[] = {
	{
		.compatible = "samsung,exynos4210-tmu",
		.data = (void *)EXYNOS4210_TMU_DRV_DATA,
	},
	{
		.compatible = "samsung,exynos5250-tmu",
		.data = (void *)EXYNOS_TMU_DRV_DATA,
	},
	{},
};
MODULE_DEVICE_TABLE(of, exynos_tmu_match);
#endif

static struct platform_device_id exynos_tmu_driver_ids[] = {
	{
		.name		= "exynos4210-tmu",
		.driver_data    = (kernel_ulong_t)EXYNOS4210_TMU_DRV_DATA,
	},
	{
		.name		= "exynos5250-tmu",
		.driver_data    = (kernel_ulong_t)EXYNOS_TMU_DRV_DATA,
	},
	{ },
};
MODULE_DEVICE_TABLE(platform, exynos_tmu_driver_ids);

static inline struct  exynos_tmu_platform_data *exynos_get_driver_data(
			struct platform_device *pdev)
{
#ifdef CONFIG_OF
	if (pdev->dev.of_node) {
		const struct of_device_id *match;
		match = of_match_node(exynos_tmu_match, pdev->dev.of_node);
		if (!match)
			return NULL;
		return (struct exynos_tmu_platform_data *) match->data;
	}
#endif
	return (struct exynos_tmu_platform_data *)
			platform_get_device_id(pdev)->driver_data;
}

#ifdef CONFIG_EXYNOS_THERMAL_EMUL
static ssize_t exynos_tmu_emulation_show(struct device *dev,
					 struct device_attribute *attr,
					 char *buf)
{
	struct platform_device *pdev = container_of(dev,
					struct platform_device, dev);
	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
	unsigned int reg;
	u8 temp_code;
	int temp = 0;

	if (data->soc == SOC_ARCH_EXYNOS4210)
		goto out;

	mutex_lock(&data->lock);
	clk_enable(data->clk);
	reg = readl(data->base + EXYNOS_EMUL_CON);
	clk_disable(data->clk);
	mutex_unlock(&data->lock);

	if (reg & EXYNOS_EMUL_ENABLE) {
		reg >>= EXYNOS_EMUL_DATA_SHIFT;
		temp_code = reg & EXYNOS_EMUL_DATA_MASK;
		temp = code_to_temp(data, temp_code);
	}
out:
	return sprintf(buf, "%d\n", temp * MCELSIUS);
}

static ssize_t exynos_tmu_emulation_store(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t count)
{
	struct platform_device *pdev = container_of(dev,
					struct platform_device, dev);
	struct exynos_tmu_data *data = platform_get_drvdata(pdev);
	unsigned int reg;
	int temp;

	if (data->soc == SOC_ARCH_EXYNOS4210)
		goto out;

	if (!sscanf(buf, "%d\n", &temp) || temp < 0)
		return -EINVAL;

	mutex_lock(&data->lock);
	clk_enable(data->clk);

	reg = readl(data->base + EXYNOS_EMUL_CON);

	if (temp) {
		/* Both CELSIUS and MCELSIUS type are available for input */
		if (temp > MCELSIUS)
			temp /= MCELSIUS;

		reg = (EXYNOS_EMUL_TIME << EXYNOS_EMUL_TIME_SHIFT) |
			(temp_to_code(data, (temp / MCELSIUS))
			 << EXYNOS_EMUL_DATA_SHIFT) | EXYNOS_EMUL_ENABLE;
	} else {
		reg &= ~EXYNOS_EMUL_ENABLE;
	}

	writel(reg, data->base + EXYNOS_EMUL_CON);

	clk_disable(data->clk);
	mutex_unlock(&data->lock);

out:
	return count;
}

static DEVICE_ATTR(emulation, 0644, exynos_tmu_emulation_show,
					exynos_tmu_emulation_store);
static int create_emulation_sysfs(struct device *dev)
{
	return device_create_file(dev, &dev_attr_emulation);
}
static void remove_emulation_sysfs(struct device *dev)
{
	device_remove_file(dev, &dev_attr_emulation);
}
#else
static inline int create_emulation_sysfs(struct device *dev) { return 0; }
static inline void remove_emulation_sysfs(struct device *dev) {}
#endif

static int exynos_tmu_probe(struct platform_device *pdev)
{
	struct exynos_tmu_data *data;
	struct exynos_tmu_platform_data *pdata = pdev->dev.platform_data;
	int ret, i;

	if (!pdata)
		pdata = exynos_get_driver_data(pdev);

	if (!pdata) {
		dev_err(&pdev->dev, "No platform init data supplied.\n");
		return -ENODEV;
	}
	data = devm_kzalloc(&pdev->dev, sizeof(struct exynos_tmu_data),
					GFP_KERNEL);
	if (!data) {
		dev_err(&pdev->dev, "Failed to allocate driver structure\n");
		return -ENOMEM;
	}

	data->irq = platform_get_irq(pdev, 0);
	if (data->irq < 0) {
		dev_err(&pdev->dev, "Failed to get platform irq\n");
		return data->irq;
	}

	INIT_WORK(&data->irq_work, exynos_tmu_work);

	data->mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!data->mem) {
		dev_err(&pdev->dev, "Failed to get platform resource\n");
		return -ENOENT;
	}

	data->base = devm_ioremap_resource(&pdev->dev, data->mem);
	if (IS_ERR(data->base))
		return PTR_ERR(data->base);

	ret = devm_request_irq(&pdev->dev, data->irq, exynos_tmu_irq,
		IRQF_TRIGGER_RISING, "exynos-tmu", data);
	if (ret) {
		dev_err(&pdev->dev, "Failed to request irq: %d\n", data->irq);
		return ret;
	}

	data->clk = clk_get(NULL, "tmu_apbif");
	if (IS_ERR(data->clk)) {
		dev_err(&pdev->dev, "Failed to get clock\n");
		return  PTR_ERR(data->clk);
	}

	if (pdata->type == SOC_ARCH_EXYNOS ||
				pdata->type == SOC_ARCH_EXYNOS4210)
		data->soc = pdata->type;
	else {
		ret = -EINVAL;
		dev_err(&pdev->dev, "Platform not supported\n");
		goto err_clk;
	}

	data->pdata = pdata;
	platform_set_drvdata(pdev, data);
	mutex_init(&data->lock);

	ret = exynos_tmu_initialize(pdev);
	if (ret) {
		dev_err(&pdev->dev, "Failed to initialize TMU\n");
		goto err_clk;
	}

	exynos_tmu_control(pdev, true);

	/* Register the sensor with thermal management interface */
	(&exynos_sensor_conf)->private_data = data;
	exynos_sensor_conf.trip_data.trip_count = pdata->trigger_level0_en +
			pdata->trigger_level1_en + pdata->trigger_level2_en +
			pdata->trigger_level3_en;

	for (i = 0; i < exynos_sensor_conf.trip_data.trip_count; i++)
		exynos_sensor_conf.trip_data.trip_val[i] =
			pdata->threshold + pdata->trigger_levels[i];

	exynos_sensor_conf.trip_data.trigger_falling = pdata->threshold_falling;

	exynos_sensor_conf.cooling_data.freq_clip_count =
						pdata->freq_tab_count;
	for (i = 0; i < pdata->freq_tab_count; i++) {
		exynos_sensor_conf.cooling_data.freq_data[i].freq_clip_max =
					pdata->freq_tab[i].freq_clip_max;
		exynos_sensor_conf.cooling_data.freq_data[i].temp_level =
					pdata->freq_tab[i].temp_level;
	}

	ret = exynos_register_thermal(&exynos_sensor_conf);
	if (ret) {
		dev_err(&pdev->dev, "Failed to register thermal interface\n");
		goto err_clk;
	}

	ret = create_emulation_sysfs(&pdev->dev);
	if (ret)
		dev_err(&pdev->dev, "Failed to create emulation mode sysfs node\n");

	return 0;
err_clk:
	platform_set_drvdata(pdev, NULL);
	clk_put(data->clk);
	return ret;
}

static int exynos_tmu_remove(struct platform_device *pdev)
{
	struct exynos_tmu_data *data = platform_get_drvdata(pdev);

	remove_emulation_sysfs(&pdev->dev);

	exynos_tmu_control(pdev, false);

	exynos_unregister_thermal();

	clk_put(data->clk);

	platform_set_drvdata(pdev, NULL);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int exynos_tmu_suspend(struct device *dev)
{
	exynos_tmu_control(to_platform_device(dev), false);

	return 0;
}

static int exynos_tmu_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);

	exynos_tmu_initialize(pdev);
	exynos_tmu_control(pdev, true);

	return 0;
}

static SIMPLE_DEV_PM_OPS(exynos_tmu_pm,
			 exynos_tmu_suspend, exynos_tmu_resume);
#define EXYNOS_TMU_PM	(&exynos_tmu_pm)
#else
#define EXYNOS_TMU_PM	NULL
#endif

static struct platform_driver exynos_tmu_driver = {
	.driver = {
		.name   = "exynos-tmu",
		.owner  = THIS_MODULE,
		.pm     = EXYNOS_TMU_PM,
		.of_match_table = of_match_ptr(exynos_tmu_match),
	},
	.probe = exynos_tmu_probe,
	.remove	= exynos_tmu_remove,
	.id_table = exynos_tmu_driver_ids,
};

module_platform_driver(exynos_tmu_driver);

MODULE_DESCRIPTION("EXYNOS TMU Driver");
MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:exynos-tmu");