aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/plat-omap/omap_device.c
blob: cee85a55bd82d3ae3e5ef0874500320e4b359bf7 (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
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
/*
 * omap_device implementation
 *
 * Copyright (C) 2009-2010 Nokia Corporation
 * Paul Walmsley, Kevin Hilman
 *
 * Developed in collaboration with (alphabetical order): Benoit
 * Cousson, Thara Gopinath, Tony Lindgren, Rajendra Nayak, Vikram
 * Pandita, Sakari Poussa, Anand Sawant, Santosh Shilimkar, Richard
 * Woodruff
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This code provides a consistent interface for OMAP device drivers
 * to control power management and interconnect properties of their
 * devices.
 *
 * In the medium- to long-term, this code should either be
 * a) implemented via arch-specific pointers in platform_data
 * or
 * b) implemented as a proper omap_bus/omap_device in Linux, no more
 *    platform_data func pointers
 *
 *
 * Guidelines for usage by driver authors:
 *
 * 1. These functions are intended to be used by device drivers via
 * function pointers in struct platform_data.  As an example,
 * omap_device_enable() should be passed to the driver as
 *
 * struct foo_driver_platform_data {
 * ...
 *      int (*device_enable)(struct platform_device *pdev);
 * ...
 * }
 *
 * Note that the generic "device_enable" name is used, rather than
 * "omap_device_enable".  This is so other architectures can pass in their
 * own enable/disable functions here.
 *
 * This should be populated during device setup:
 *
 * ...
 * pdata->device_enable = omap_device_enable;
 * ...
 *
 * 2. Drivers should first check to ensure the function pointer is not null
 * before calling it, as in:
 *
 * if (pdata->device_enable)
 *     pdata->device_enable(pdev);
 *
 * This allows other architectures that don't use similar device_enable()/
 * device_shutdown() functions to execute normally.
 *
 * ...
 *
 * Suggested usage by device drivers:
 *
 * During device initialization:
 * device_enable()
 *
 * During device idle:
 * (save remaining device context if necessary)
 * device_idle();
 *
 * During device resume:
 * device_enable();
 * (restore context if necessary)
 *
 * During device shutdown:
 * device_shutdown()
 * (device must be reinitialized at this point to use it again)
 *
 */
#undef DEBUG

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/clkdev.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/notifier.h>

#include <plat/omap_device.h>
#include <plat/omap_hwmod.h>
#include <plat/clock.h>

/* These parameters are passed to _omap_device_{de,}activate() */
#define USE_WAKEUP_LAT			0
#define IGNORE_WAKEUP_LAT		1

static int omap_early_device_register(struct platform_device *pdev);

static struct omap_device_pm_latency omap_default_latency[] = {
	{
		.deactivate_func = omap_device_idle_hwmods,
		.activate_func   = omap_device_enable_hwmods,
		.flags = OMAP_DEVICE_LATENCY_AUTO_ADJUST,
	}
};

/* Private functions */

/**
 * _omap_device_activate - increase device readiness
 * @od: struct omap_device *
 * @ignore_lat: increase to latency target (0) or full readiness (1)?
 *
 * Increase readiness of omap_device @od (thus decreasing device
 * wakeup latency, but consuming more power).  If @ignore_lat is
 * IGNORE_WAKEUP_LAT, make the omap_device fully active.  Otherwise,
 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
 * latency is greater than the requested maximum wakeup latency, step
 * backwards in the omap_device_pm_latency table to ensure the
 * device's maximum wakeup latency is less than or equal to the
 * requested maximum wakeup latency.  Returns 0.
 */
static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
{
	struct timespec a, b, c;

	dev_dbg(&od->pdev->dev, "omap_device: activating\n");

	while (od->pm_lat_level > 0) {
		struct omap_device_pm_latency *odpl;
		unsigned long long act_lat = 0;

		od->pm_lat_level--;

		odpl = od->pm_lats + od->pm_lat_level;

		if (!ignore_lat &&
		    (od->dev_wakeup_lat <= od->_dev_wakeup_lat_limit))
			break;

		read_persistent_clock(&a);

		/* XXX check return code */
		odpl->activate_func(od);

		read_persistent_clock(&b);

		c = timespec_sub(b, a);
		act_lat = timespec_to_ns(&c);

		dev_dbg(&od->pdev->dev,
			"omap_device: pm_lat %d: activate: elapsed time %llu nsec\n",
			od->pm_lat_level, act_lat);

		if (act_lat > odpl->activate_lat) {
			odpl->activate_lat_worst = act_lat;
			if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
				odpl->activate_lat = act_lat;
				dev_dbg(&od->pdev->dev,
					"new worst case activate latency %d: %llu\n",
					od->pm_lat_level, act_lat);
			} else
				dev_warn(&od->pdev->dev,
					 "activate latency %d higher than expected. (%llu > %d)\n",
					 od->pm_lat_level, act_lat,
					 odpl->activate_lat);
		}

		od->dev_wakeup_lat -= odpl->activate_lat;
	}

	return 0;
}

/**
 * _omap_device_deactivate - decrease device readiness
 * @od: struct omap_device *
 * @ignore_lat: decrease to latency target (0) or full inactivity (1)?
 *
 * Decrease readiness of omap_device @od (thus increasing device
 * wakeup latency, but conserving power).  If @ignore_lat is
 * IGNORE_WAKEUP_LAT, make the omap_device fully inactive.  Otherwise,
 * if @ignore_lat is USE_WAKEUP_LAT, and the device's maximum wakeup
 * latency is less than the requested maximum wakeup latency, step
 * forwards in the omap_device_pm_latency table to ensure the device's
 * maximum wakeup latency is less than or equal to the requested
 * maximum wakeup latency.  Returns 0.
 */
static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
{
	struct timespec a, b, c;

	dev_dbg(&od->pdev->dev, "omap_device: deactivating\n");

	while (od->pm_lat_level < od->pm_lats_cnt) {
		struct omap_device_pm_latency *odpl;
		unsigned long long deact_lat = 0;

		odpl = od->pm_lats + od->pm_lat_level;

		if (!ignore_lat &&
		    ((od->dev_wakeup_lat + odpl->activate_lat) >
		     od->_dev_wakeup_lat_limit))
			break;

		read_persistent_clock(&a);

		/* XXX check return code */
		odpl->deactivate_func(od);

		read_persistent_clock(&b);

		c = timespec_sub(b, a);
		deact_lat = timespec_to_ns(&c);

		dev_dbg(&od->pdev->dev,
			"omap_device: pm_lat %d: deactivate: elapsed time %llu nsec\n",
			od->pm_lat_level, deact_lat);

		if (deact_lat > odpl->deactivate_lat) {
			odpl->deactivate_lat_worst = deact_lat;
			if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
				odpl->deactivate_lat = deact_lat;
				dev_dbg(&od->pdev->dev,
					"new worst case deactivate latency %d: %llu\n",
					od->pm_lat_level, deact_lat);
			} else
				dev_warn(&od->pdev->dev,
					 "deactivate latency %d higher than expected. (%llu > %d)\n",
					 od->pm_lat_level, deact_lat,
					 odpl->deactivate_lat);
		}

		od->dev_wakeup_lat += odpl->activate_lat;

		od->pm_lat_level++;
	}

	return 0;
}

static void _add_clkdev(struct omap_device *od, const char *clk_alias,
		       const char *clk_name)
{
	struct clk *r;
	struct clk_lookup *l;

	if (!clk_alias || !clk_name)
		return;

	dev_dbg(&od->pdev->dev, "Creating %s -> %s\n", clk_alias, clk_name);

	r = clk_get_sys(dev_name(&od->pdev->dev), clk_alias);
	if (!IS_ERR(r)) {
		dev_warn(&od->pdev->dev,
			 "alias %s already exists\n", clk_alias);
		clk_put(r);
		return;
	}

	r = clk_get(NULL, clk_name);
	if (IS_ERR(r)) {
		dev_err(&od->pdev->dev,
			"clk_get for %s failed\n", clk_name);
		return;
	}

	l = clkdev_alloc(r, clk_alias, dev_name(&od->pdev->dev));
	if (!l) {
		dev_err(&od->pdev->dev,
			"clkdev_alloc for %s failed\n", clk_alias);
		return;
	}

	clkdev_add(l);
}

/**
 * _add_hwmod_clocks_clkdev - Add clkdev entry for hwmod optional clocks
 * and main clock
 * @od: struct omap_device *od
 * @oh: struct omap_hwmod *oh
 *
 * For the main clock and every optional clock present per hwmod per
 * omap_device, this function adds an entry in the clkdev table of the
 * form <dev-id=dev_name, con-id=role> if it does not exist already.
 *
 * The function is called from inside omap_device_build_ss(), after
 * omap_device_register.
 *
 * This allows drivers to get a pointer to its optional clocks based on its role
 * by calling clk_get(<dev*>, <role>).
 * In the case of the main clock, a "fck" alias is used.
 *
 * No return value.
 */
static void _add_hwmod_clocks_clkdev(struct omap_device *od,
				     struct omap_hwmod *oh)
{
	int i;

	_add_clkdev(od, "fck", oh->main_clk);

	for (i = 0; i < oh->opt_clks_cnt; i++)
		_add_clkdev(od, oh->opt_clks[i].role, oh->opt_clks[i].clk);
}


/**
 * omap_device_build_from_dt - build an omap_device with multiple hwmods
 * @pdev_name: name of the platform_device driver to use
 * @pdev_id: this platform_device's connection ID
 * @oh: ptr to the single omap_hwmod that backs this omap_device
 * @pdata: platform_data ptr to associate with the platform_device
 * @pdata_len: amount of memory pointed to by @pdata
 * @pm_lats: pointer to a omap_device_pm_latency array for this device
 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
 * @is_early_device: should the device be registered as an early device or not
 *
 * Function for building an omap_device already registered from device-tree
 *
 * Returns 0 or PTR_ERR() on error.
 */
static int omap_device_build_from_dt(struct platform_device *pdev)
{
	struct omap_hwmod **hwmods;
	struct omap_device *od;
	struct omap_hwmod *oh;
	struct device_node *node = pdev->dev.of_node;
	const char *oh_name;
	int oh_cnt, i, ret = 0;

	oh_cnt = of_property_count_strings(node, "ti,hwmods");
	if (!oh_cnt || IS_ERR_VALUE(oh_cnt)) {
		dev_dbg(&pdev->dev, "No 'hwmods' to build omap_device\n");
		return -ENODEV;
	}

	hwmods = kzalloc(sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
	if (!hwmods) {
		ret = -ENOMEM;
		goto odbfd_exit;
	}

	for (i = 0; i < oh_cnt; i++) {
		of_property_read_string_index(node, "ti,hwmods", i, &oh_name);
		oh = omap_hwmod_lookup(oh_name);
		if (!oh) {
			dev_err(&pdev->dev, "Cannot lookup hwmod '%s'\n",
				oh_name);
			ret = -EINVAL;
			goto odbfd_exit1;
		}
		hwmods[i] = oh;
	}

	od = omap_device_alloc(pdev, hwmods, oh_cnt, NULL, 0);
	if (!od) {
		dev_err(&pdev->dev, "Cannot allocate omap_device for :%s\n",
			oh_name);
		ret = PTR_ERR(od);
		goto odbfd_exit1;
	}

	/* Fix up missing resource names */
	for (i = 0; i < pdev->num_resources; i++) {
		struct resource *r = &pdev->resource[i];

		if (r->name == NULL)
			r->name = dev_name(&pdev->dev);
	}

	if (of_get_property(node, "ti,no_idle_on_suspend", NULL))
		omap_device_disable_idle_on_suspend(pdev);

	pdev->dev.pm_domain = &omap_device_pm_domain;

odbfd_exit1:
	kfree(hwmods);
odbfd_exit:
	return ret;
}

static int _omap_device_notifier_call(struct notifier_block *nb,
				      unsigned long event, void *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct omap_device *od;

	switch (event) {
	case BUS_NOTIFY_DEL_DEVICE:
		if (pdev->archdata.od)
			omap_device_delete(pdev->archdata.od);
		break;
	case BUS_NOTIFY_ADD_DEVICE:
		if (pdev->dev.of_node)
			omap_device_build_from_dt(pdev);
		/* fall through */
	default:
		od = to_omap_device(pdev);
		if (od)
			od->_driver_status = event;
	}

	return NOTIFY_DONE;
}


/* Public functions for use by core code */

/**
 * omap_device_get_context_loss_count - get lost context count
 * @od: struct omap_device *
 *
 * Using the primary hwmod, query the context loss count for this
 * device.
 *
 * Callers should consider context for this device lost any time this
 * function returns a value different than the value the caller got
 * the last time it called this function.
 *
 * If any hwmods exist for the omap_device assoiated with @pdev,
 * return the context loss counter for that hwmod, otherwise return
 * zero.
 */
int omap_device_get_context_loss_count(struct platform_device *pdev)
{
	struct omap_device *od;
	u32 ret = 0;

	od = to_omap_device(pdev);

	if (od->hwmods_cnt)
		ret = omap_hwmod_get_context_loss_count(od->hwmods[0]);

	return ret;
}

/**
 * omap_device_count_resources - count number of struct resource entries needed
 * @od: struct omap_device *
 *
 * Count the number of struct resource entries needed for this
 * omap_device @od.  Used by omap_device_build_ss() to determine how
 * much memory to allocate before calling
 * omap_device_fill_resources().  Returns the count.
 */
static int omap_device_count_resources(struct omap_device *od)
{
	int c = 0;
	int i;

	for (i = 0; i < od->hwmods_cnt; i++)
		c += omap_hwmod_count_resources(od->hwmods[i]);

	pr_debug("omap_device: %s: counted %d total resources across %d hwmods\n",
		 od->pdev->name, c, od->hwmods_cnt);

	return c;
}

/**
 * omap_device_fill_resources - fill in array of struct resource
 * @od: struct omap_device *
 * @res: pointer to an array of struct resource to be filled in
 *
 * Populate one or more empty struct resource pointed to by @res with
 * the resource data for this omap_device @od.  Used by
 * omap_device_build_ss() after calling omap_device_count_resources().
 * Ideally this function would not be needed at all.  If omap_device
 * replaces platform_device, then we can specify our own
 * get_resource()/ get_irq()/etc functions that use the underlying
 * omap_hwmod information.  Or if platform_device is extended to use
 * subarchitecture-specific function pointers, the various
 * platform_device functions can simply call omap_device internal
 * functions to get device resources.  Hacking around the existing
 * platform_device code wastes memory.  Returns 0.
 */
static int omap_device_fill_resources(struct omap_device *od,
				      struct resource *res)
{
	int i, r;

	for (i = 0; i < od->hwmods_cnt; i++) {
		r = omap_hwmod_fill_resources(od->hwmods[i], res);
		res += r;
	}

	return 0;
}

/**
 * _od_fill_dma_resources - fill in array of struct resource with dma resources
 * @od: struct omap_device *
 * @res: pointer to an array of struct resource to be filled in
 *
 * Populate one or more empty struct resource pointed to by @res with
 * the dma resource data for this omap_device @od.  Used by
 * omap_device_alloc() after calling omap_device_count_resources().
 *
 * Ideally this function would not be needed at all.  If we have
 * mechanism to get dma resources from DT.
 *
 * Returns 0.
 */
static int _od_fill_dma_resources(struct omap_device *od,
				      struct resource *res)
{
	int i, r;

	for (i = 0; i < od->hwmods_cnt; i++) {
		r = omap_hwmod_fill_dma_resources(od->hwmods[i], res);
		res += r;
	}

	return 0;
}

/**
 * omap_device_alloc - allocate an omap_device
 * @pdev: platform_device that will be included in this omap_device
 * @oh: ptr to the single omap_hwmod that backs this omap_device
 * @pdata: platform_data ptr to associate with the platform_device
 * @pdata_len: amount of memory pointed to by @pdata
 * @pm_lats: pointer to a omap_device_pm_latency array for this device
 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
 *
 * Convenience function for allocating an omap_device structure and filling
 * hwmods, resources and pm_latency attributes.
 *
 * Returns an struct omap_device pointer or ERR_PTR() on error;
 */
struct omap_device *omap_device_alloc(struct platform_device *pdev,
					struct omap_hwmod **ohs, int oh_cnt,
					struct omap_device_pm_latency *pm_lats,
					int pm_lats_cnt)
{
	int ret = -ENOMEM;
	struct omap_device *od;
	struct resource *res = NULL;
	int i, res_count;
	struct omap_hwmod **hwmods;

	od = kzalloc(sizeof(struct omap_device), GFP_KERNEL);
	if (!od) {
		ret = -ENOMEM;
		goto oda_exit1;
	}
	od->hwmods_cnt = oh_cnt;

	hwmods = kmemdup(ohs, sizeof(struct omap_hwmod *) * oh_cnt, GFP_KERNEL);
	if (!hwmods)
		goto oda_exit2;

	od->hwmods = hwmods;
	od->pdev = pdev;

	res_count = omap_device_count_resources(od);
	/*
	 * DT Boot:
	 *   OF framework will construct the resource structure (currently
	 *   does for MEM & IRQ resource) and we should respect/use these
	 *   resources, killing hwmod dependency.
	 *   If pdev->num_resources > 0, we assume that MEM & IRQ resources
	 *   have been allocated by OF layer already (through DTB).
	 *
	 * Non-DT Boot:
	 *   Here, pdev->num_resources = 0, and we should get all the
	 *   resources from hwmod.
	 *
	 * TODO: Once DMA resource is available from OF layer, we should
	 *   kill filling any resources from hwmod.
	 */
	if (res_count > pdev->num_resources) {
		/* Allocate resources memory to account for new resources */
		res = kzalloc(sizeof(struct resource) * res_count, GFP_KERNEL);
		if (!res)
			goto oda_exit3;

		/*
		 * If pdev->num_resources > 0, then assume that,
		 * MEM and IRQ resources will only come from DT and only
		 * fill DMA resource from hwmod layer.
		 */
		if (pdev->num_resources && pdev->resource) {
			dev_dbg(&pdev->dev, "%s(): resources already allocated %d\n",
				__func__, res_count);
			memcpy(res, pdev->resource,
			       sizeof(struct resource) * pdev->num_resources);
			_od_fill_dma_resources(od, &res[pdev->num_resources]);
		} else {
			dev_dbg(&pdev->dev, "%s(): using resources from hwmod %d\n",
				__func__, res_count);
			omap_device_fill_resources(od, res);
		}

		ret = platform_device_add_resources(pdev, res, res_count);
		kfree(res);

		if (ret)
			goto oda_exit3;
	}

	if (!pm_lats) {
		pm_lats = omap_default_latency;
		pm_lats_cnt = ARRAY_SIZE(omap_default_latency);
	}

	od->pm_lats_cnt = pm_lats_cnt;
	od->pm_lats = kmemdup(pm_lats,
			sizeof(struct omap_device_pm_latency) * pm_lats_cnt,
			GFP_KERNEL);
	if (!od->pm_lats)
		goto oda_exit3;

	pdev->archdata.od = od;

	for (i = 0; i < oh_cnt; i++) {
		hwmods[i]->od = od;
		_add_hwmod_clocks_clkdev(od, hwmods[i]);
	}

	return od;

oda_exit3:
	kfree(hwmods);
oda_exit2:
	kfree(od);
oda_exit1:
	dev_err(&pdev->dev, "omap_device: build failed (%d)\n", ret);

	return ERR_PTR(ret);
}

void omap_device_delete(struct omap_device *od)
{
	if (!od)
		return;

	od->pdev->archdata.od = NULL;
	kfree(od->pm_lats);
	kfree(od->hwmods);
	kfree(od);
}

/**
 * omap_device_build - build and register an omap_device with one omap_hwmod
 * @pdev_name: name of the platform_device driver to use
 * @pdev_id: this platform_device's connection ID
 * @oh: ptr to the single omap_hwmod that backs this omap_device
 * @pdata: platform_data ptr to associate with the platform_device
 * @pdata_len: amount of memory pointed to by @pdata
 * @pm_lats: pointer to a omap_device_pm_latency array for this device
 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
 * @is_early_device: should the device be registered as an early device or not
 *
 * Convenience function for building and registering a single
 * omap_device record, which in turn builds and registers a
 * platform_device record.  See omap_device_build_ss() for more
 * information.  Returns ERR_PTR(-EINVAL) if @oh is NULL; otherwise,
 * passes along the return value of omap_device_build_ss().
 */
struct platform_device __init *omap_device_build(const char *pdev_name, int pdev_id,
				      struct omap_hwmod *oh, void *pdata,
				      int pdata_len,
				      struct omap_device_pm_latency *pm_lats,
				      int pm_lats_cnt, int is_early_device)
{
	struct omap_hwmod *ohs[] = { oh };

	if (!oh)
		return ERR_PTR(-EINVAL);

	return omap_device_build_ss(pdev_name, pdev_id, ohs, 1, pdata,
				    pdata_len, pm_lats, pm_lats_cnt,
				    is_early_device);
}

/**
 * omap_device_build_ss - build and register an omap_device with multiple hwmods
 * @pdev_name: name of the platform_device driver to use
 * @pdev_id: this platform_device's connection ID
 * @oh: ptr to the single omap_hwmod that backs this omap_device
 * @pdata: platform_data ptr to associate with the platform_device
 * @pdata_len: amount of memory pointed to by @pdata
 * @pm_lats: pointer to a omap_device_pm_latency array for this device
 * @pm_lats_cnt: ARRAY_SIZE() of @pm_lats
 * @is_early_device: should the device be registered as an early device or not
 *
 * Convenience function for building and registering an omap_device
 * subsystem record.  Subsystem records consist of multiple
 * omap_hwmods.  This function in turn builds and registers a
 * platform_device record.  Returns an ERR_PTR() on error, or passes
 * along the return value of omap_device_register().
 */
struct platform_device __init *omap_device_build_ss(const char *pdev_name, int pdev_id,
					 struct omap_hwmod **ohs, int oh_cnt,
					 void *pdata, int pdata_len,
					 struct omap_device_pm_latency *pm_lats,
					 int pm_lats_cnt, int is_early_device)
{
	int ret = -ENOMEM;
	struct platform_device *pdev;
	struct omap_device *od;

	if (!ohs || oh_cnt == 0 || !pdev_name)
		return ERR_PTR(-EINVAL);

	if (!pdata && pdata_len > 0)
		return ERR_PTR(-EINVAL);

	pdev = platform_device_alloc(pdev_name, pdev_id);
	if (!pdev) {
		ret = -ENOMEM;
		goto odbs_exit;
	}

	/* Set the dev_name early to allow dev_xxx in omap_device_alloc */
	if (pdev->id != -1)
		dev_set_name(&pdev->dev, "%s.%d", pdev->name,  pdev->id);
	else
		dev_set_name(&pdev->dev, "%s", pdev->name);

	od = omap_device_alloc(pdev, ohs, oh_cnt, pm_lats, pm_lats_cnt);
	if (!od)
		goto odbs_exit1;

	ret = platform_device_add_data(pdev, pdata, pdata_len);
	if (ret)
		goto odbs_exit2;

	if (is_early_device)
		ret = omap_early_device_register(pdev);
	else
		ret = omap_device_register(pdev);
	if (ret)
		goto odbs_exit2;

	return pdev;

odbs_exit2:
	omap_device_delete(od);
odbs_exit1:
	platform_device_put(pdev);
odbs_exit:

	pr_err("omap_device: %s: build failed (%d)\n", pdev_name, ret);

	return ERR_PTR(ret);
}

/**
 * omap_early_device_register - register an omap_device as an early platform
 * device.
 * @od: struct omap_device * to register
 *
 * Register the omap_device structure.  This currently just calls
 * platform_early_add_device() on the underlying platform_device.
 * Returns 0 by default.
 */
static int __init omap_early_device_register(struct platform_device *pdev)
{
	struct platform_device *devices[1];

	devices[0] = pdev;
	early_platform_add_devices(devices, 1);
	return 0;
}

#ifdef CONFIG_PM_RUNTIME
static int _od_runtime_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	int ret;

	ret = pm_generic_runtime_suspend(dev);

	if (!ret)
		omap_device_idle(pdev);

	return ret;
}

static int _od_runtime_idle(struct device *dev)
{
	return pm_generic_runtime_idle(dev);
}

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

	omap_device_enable(pdev);

	return pm_generic_runtime_resume(dev);
}
#endif

#ifdef CONFIG_SUSPEND
static int _od_suspend_noirq(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct omap_device *od = to_omap_device(pdev);
	int ret;

	/* Don't attempt late suspend on a driver that is not bound */
	if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER)
		return 0;

	ret = pm_generic_suspend_noirq(dev);

	if (!ret && !pm_runtime_status_suspended(dev)) {
		if (pm_generic_runtime_suspend(dev) == 0) {
			if (!(od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND))
				omap_device_idle(pdev);
			od->flags |= OMAP_DEVICE_SUSPENDED;
		}
	}

	return ret;
}

static int _od_resume_noirq(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct omap_device *od = to_omap_device(pdev);

	if ((od->flags & OMAP_DEVICE_SUSPENDED) &&
	    !pm_runtime_status_suspended(dev)) {
		od->flags &= ~OMAP_DEVICE_SUSPENDED;
		if (!(od->flags & OMAP_DEVICE_NO_IDLE_ON_SUSPEND))
			omap_device_enable(pdev);
		pm_generic_runtime_resume(dev);
	}

	return pm_generic_resume_noirq(dev);
}
#else
#define _od_suspend_noirq NULL
#define _od_resume_noirq NULL
#endif

struct dev_pm_domain omap_device_pm_domain = {
	.ops = {
		SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
				   _od_runtime_idle)
		USE_PLATFORM_PM_SLEEP_OPS
		.suspend_noirq = _od_suspend_noirq,
		.resume_noirq = _od_resume_noirq,
	}
};

/**
 * omap_device_register - register an omap_device with one omap_hwmod
 * @od: struct omap_device * to register
 *
 * Register the omap_device structure.  This currently just calls
 * platform_device_register() on the underlying platform_device.
 * Returns the return value of platform_device_register().
 */
int omap_device_register(struct platform_device *pdev)
{
	pr_debug("omap_device: %s: registering\n", pdev->name);

	pdev->dev.pm_domain = &omap_device_pm_domain;
	return platform_device_add(pdev);
}


/* Public functions for use by device drivers through struct platform_data */

/**
 * omap_device_enable - fully activate an omap_device
 * @od: struct omap_device * to activate
 *
 * Do whatever is necessary for the hwmods underlying omap_device @od
 * to be accessible and ready to operate.  This generally involves
 * enabling clocks, setting SYSCONFIG registers; and in the future may
 * involve remuxing pins.  Device drivers should call this function
 * (through platform_data function pointers) where they would normally
 * enable clocks, etc.  Returns -EINVAL if called when the omap_device
 * is already enabled, or passes along the return value of
 * _omap_device_activate().
 */
int omap_device_enable(struct platform_device *pdev)
{
	int ret;
	struct omap_device *od;

	od = to_omap_device(pdev);

	if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
		dev_warn(&pdev->dev,
			 "omap_device: %s() called from invalid state %d\n",
			 __func__, od->_state);
		return -EINVAL;
	}

	/* Enable everything if we're enabling this device from scratch */
	if (od->_state == OMAP_DEVICE_STATE_UNKNOWN)
		od->pm_lat_level = od->pm_lats_cnt;

	ret = _omap_device_activate(od, IGNORE_WAKEUP_LAT);

	od->dev_wakeup_lat = 0;
	od->_dev_wakeup_lat_limit = UINT_MAX;
	od->_state = OMAP_DEVICE_STATE_ENABLED;

	return ret;
}

/**
 * omap_device_idle - idle an omap_device
 * @od: struct omap_device * to idle
 *
 * Idle omap_device @od by calling as many .deactivate_func() entries
 * in the omap_device's pm_lats table as is possible without exceeding
 * the device's maximum wakeup latency limit, pm_lat_limit.  Device
 * drivers should call this function (through platform_data function
 * pointers) where they would normally disable clocks after operations
 * complete, etc..  Returns -EINVAL if the omap_device is not
 * currently enabled, or passes along the return value of
 * _omap_device_deactivate().
 */
int omap_device_idle(struct platform_device *pdev)
{
	int ret;
	struct omap_device *od;

	od = to_omap_device(pdev);

	if (od->_state != OMAP_DEVICE_STATE_ENABLED) {
		dev_warn(&pdev->dev,
			 "omap_device: %s() called from invalid state %d\n",
			 __func__, od->_state);
		return -EINVAL;
	}

	ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);

	od->_state = OMAP_DEVICE_STATE_IDLE;

	return ret;
}

/**
 * omap_device_shutdown - shut down an omap_device
 * @od: struct omap_device * to shut down
 *
 * Shut down omap_device @od by calling all .deactivate_func() entries
 * in the omap_device's pm_lats table and then shutting down all of
 * the underlying omap_hwmods.  Used when a device is being "removed"
 * or a device driver is being unloaded.  Returns -EINVAL if the
 * omap_device is not currently enabled or idle, or passes along the
 * return value of _omap_device_deactivate().
 */
int omap_device_shutdown(struct platform_device *pdev)
{
	int ret, i;
	struct omap_device *od;

	od = to_omap_device(pdev);

	if (od->_state != OMAP_DEVICE_STATE_ENABLED &&
	    od->_state != OMAP_DEVICE_STATE_IDLE) {
		dev_warn(&pdev->dev,
			 "omap_device: %s() called from invalid state %d\n",
			 __func__, od->_state);
		return -EINVAL;
	}

	ret = _omap_device_deactivate(od, IGNORE_WAKEUP_LAT);

	for (i = 0; i < od->hwmods_cnt; i++)
		omap_hwmod_shutdown(od->hwmods[i]);

	od->_state = OMAP_DEVICE_STATE_SHUTDOWN;

	return ret;
}

/**
 * omap_device_assert_hardreset - set a device's hardreset line
 * @pdev: struct platform_device * to reset
 * @name: const char * name of the reset line
 *
 * Set the hardreset line identified by @name on the IP blocks
 * associated with the hwmods backing the platform_device @pdev.  All
 * of the hwmods associated with @pdev must have the same hardreset
 * line linked to them for this to work.  Passes along the return value
 * of omap_hwmod_assert_hardreset() in the event of any failure, or
 * returns 0 upon success.
 */
int omap_device_assert_hardreset(struct platform_device *pdev, const char *name)
{
	struct omap_device *od = to_omap_device(pdev);
	int ret = 0;
	int i;

	for (i = 0; i < od->hwmods_cnt; i++) {
		ret = omap_hwmod_assert_hardreset(od->hwmods[i], name);
		if (ret)
			break;
	}

	return ret;
}

/**
 * omap_device_deassert_hardreset - release a device's hardreset line
 * @pdev: struct platform_device * to reset
 * @name: const char * name of the reset line
 *
 * Release the hardreset line identified by @name on the IP blocks
 * associated with the hwmods backing the platform_device @pdev.  All
 * of the hwmods associated with @pdev must have the same hardreset
 * line linked to them for this to work.  Passes along the return
 * value of omap_hwmod_deassert_hardreset() in the event of any
 * failure, or returns 0 upon success.
 */
int omap_device_deassert_hardreset(struct platform_device *pdev,
				   const char *name)
{
	struct omap_device *od = to_omap_device(pdev);
	int ret = 0;
	int i;

	for (i = 0; i < od->hwmods_cnt; i++) {
		ret = omap_hwmod_deassert_hardreset(od->hwmods[i], name);
		if (ret)
			break;
	}

	return ret;
}

/**
 * omap_device_align_pm_lat - activate/deactivate device to match wakeup lat lim
 * @od: struct omap_device *
 *
 * When a device's maximum wakeup latency limit changes, call some of
 * the .activate_func or .deactivate_func function pointers in the
 * omap_device's pm_lats array to ensure that the device's maximum
 * wakeup latency is less than or equal to the new latency limit.
 * Intended to be called by OMAP PM code whenever a device's maximum
 * wakeup latency limit changes (e.g., via
 * omap_pm_set_dev_wakeup_lat()).  Returns 0 if nothing needs to be
 * done (e.g., if the omap_device is not currently idle, or if the
 * wakeup latency is already current with the new limit) or passes
 * along the return value of _omap_device_deactivate() or
 * _omap_device_activate().
 */
int omap_device_align_pm_lat(struct platform_device *pdev,
			     u32 new_wakeup_lat_limit)
{
	int ret = -EINVAL;
	struct omap_device *od;

	od = to_omap_device(pdev);

	if (new_wakeup_lat_limit == od->dev_wakeup_lat)
		return 0;

	od->_dev_wakeup_lat_limit = new_wakeup_lat_limit;

	if (od->_state != OMAP_DEVICE_STATE_IDLE)
		return 0;
	else if (new_wakeup_lat_limit > od->dev_wakeup_lat)
		ret = _omap_device_deactivate(od, USE_WAKEUP_LAT);
	else if (new_wakeup_lat_limit < od->dev_wakeup_lat)
		ret = _omap_device_activate(od, USE_WAKEUP_LAT);

	return ret;
}

/**
 * omap_device_get_pwrdm - return the powerdomain * associated with @od
 * @od: struct omap_device *
 *
 * Return the powerdomain associated with the first underlying
 * omap_hwmod for this omap_device.  Intended for use by core OMAP PM
 * code.  Returns NULL on error or a struct powerdomain * upon
 * success.
 */
struct powerdomain *omap_device_get_pwrdm(struct omap_device *od)
{
	/*
	 * XXX Assumes that all omap_hwmod powerdomains are identical.
	 * This may not necessarily be true.  There should be a sanity
	 * check in here to WARN() if any difference appears.
	 */
	if (!od->hwmods_cnt)
		return NULL;

	return omap_hwmod_get_pwrdm(od->hwmods[0]);
}

/**
 * omap_device_get_mpu_rt_va - return the MPU's virtual addr for the hwmod base
 * @od: struct omap_device *
 *
 * Return the MPU's virtual address for the base of the hwmod, from
 * the ioremap() that the hwmod code does.  Only valid if there is one
 * hwmod associated with this device.  Returns NULL if there are zero
 * or more than one hwmods associated with this omap_device;
 * otherwise, passes along the return value from
 * omap_hwmod_get_mpu_rt_va().
 */
void __iomem *omap_device_get_rt_va(struct omap_device *od)
{
	if (od->hwmods_cnt != 1)
		return NULL;

	return omap_hwmod_get_mpu_rt_va(od->hwmods[0]);
}

/**
 * omap_device_get_by_hwmod_name() - convert a hwmod name to
 * device pointer.
 * @oh_name: name of the hwmod device
 *
 * Returns back a struct device * pointer associated with a hwmod
 * device represented by a hwmod_name
 */
struct device *omap_device_get_by_hwmod_name(const char *oh_name)
{
	struct omap_hwmod *oh;

	if (!oh_name) {
		WARN(1, "%s: no hwmod name!\n", __func__);
		return ERR_PTR(-EINVAL);
	}

	oh = omap_hwmod_lookup(oh_name);
	if (IS_ERR_OR_NULL(oh)) {
		WARN(1, "%s: no hwmod for %s\n", __func__,
			oh_name);
		return ERR_PTR(oh ? PTR_ERR(oh) : -ENODEV);
	}
	if (IS_ERR_OR_NULL(oh->od)) {
		WARN(1, "%s: no omap_device for %s\n", __func__,
			oh_name);
		return ERR_PTR(oh->od ? PTR_ERR(oh->od) : -ENODEV);
	}

	if (IS_ERR_OR_NULL(oh->od->pdev))
		return ERR_PTR(oh->od->pdev ? PTR_ERR(oh->od->pdev) : -ENODEV);

	return &oh->od->pdev->dev;
}
EXPORT_SYMBOL(omap_device_get_by_hwmod_name);

/*
 * Public functions intended for use in omap_device_pm_latency
 * .activate_func and .deactivate_func function pointers
 */

/**
 * omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
 * @od: struct omap_device *od
 *
 * Enable all underlying hwmods.  Returns 0.
 */
int omap_device_enable_hwmods(struct omap_device *od)
{
	int i;

	for (i = 0; i < od->hwmods_cnt; i++)
		omap_hwmod_enable(od->hwmods[i]);

	/* XXX pass along return value here? */
	return 0;
}

/**
 * omap_device_idle_hwmods - call omap_hwmod_idle() on all hwmods
 * @od: struct omap_device *od
 *
 * Idle all underlying hwmods.  Returns 0.
 */
int omap_device_idle_hwmods(struct omap_device *od)
{
	int i;

	for (i = 0; i < od->hwmods_cnt; i++)
		omap_hwmod_idle(od->hwmods[i]);

	/* XXX pass along return value here? */
	return 0;
}

/**
 * omap_device_disable_clocks - disable all main and interface clocks
 * @od: struct omap_device *od
 *
 * Disable the main functional clock and interface clock for all of the
 * omap_hwmods associated with the omap_device.  Returns 0.
 */
int omap_device_disable_clocks(struct omap_device *od)
{
	int i;

	for (i = 0; i < od->hwmods_cnt; i++)
		omap_hwmod_disable_clocks(od->hwmods[i]);

	/* XXX pass along return value here? */
	return 0;
}

/**
 * omap_device_enable_clocks - enable all main and interface clocks
 * @od: struct omap_device *od
 *
 * Enable the main functional clock and interface clock for all of the
 * omap_hwmods associated with the omap_device.  Returns 0.
 */
int omap_device_enable_clocks(struct omap_device *od)
{
	int i;

	for (i = 0; i < od->hwmods_cnt; i++)
		omap_hwmod_enable_clocks(od->hwmods[i]);

	/* XXX pass along return value here? */
	return 0;
}

static struct notifier_block platform_nb = {
	.notifier_call = _omap_device_notifier_call,
};

static int __init omap_device_init(void)
{
	bus_register_notifier(&platform_bus_type, &platform_nb);
	return 0;
}
core_initcall(omap_device_init);

/**
 * omap_device_late_idle - idle devices without drivers
 * @dev: struct device * associated with omap_device
 * @data: unused
 *
 * Check the driver bound status of this device, and idle it
 * if there is no driver attached.
 */
static int __init omap_device_late_idle(struct device *dev, void *data)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct omap_device *od = to_omap_device(pdev);

	if (!od)
		return 0;

	/*
	 * If omap_device state is enabled, but has no driver bound,
	 * idle it.
	 */
	if (od->_driver_status != BUS_NOTIFY_BOUND_DRIVER) {
		if (od->_state == OMAP_DEVICE_STATE_ENABLED) {
			dev_warn(dev, "%s: enabled but no driver.  Idling\n",
				 __func__);
			omap_device_idle(pdev);
		}
	}

	return 0;
}

static int __init omap_device_late_init(void)
{
	bus_for_each_dev(&platform_bus_type, NULL, NULL, omap_device_late_idle);
	return 0;
}
late_initcall(omap_device_late_init);