summaryrefslogtreecommitdiff
path: root/arch/arm/mach-omap2/omap_device.c
blob: 01ef59def44b86e84a5a1afc1b84d34f0caa17e4 (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
/*
 * 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 be implemented as a
 * proper omap_bus/omap_device in Linux, no more platform_data func
 * pointers
 *
 *
 */
#undef DEBUG

#include <linux/kernel.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 "common.h"
#include "soc.h"
#include "omap_device.h"
#include "omap_hwmod.h"

/* Private functions */

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
 *
 * 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;
	bool device_active = false;

	oh_cnt = of_property_count_strings(node, "ti,hwmods");
	if (oh_cnt <= 0) {
		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;
		if (oh->flags & HWMOD_INIT_NO_IDLE)
			device_active = true;
	}

	od = omap_device_alloc(pdev, hwmods, oh_cnt);
	if (IS_ERR(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);
	}

	pdev->dev.pm_domain = &omap_device_pm_domain;

	if (device_active) {
		omap_device_enable(pdev);
		pm_runtime_set_active(&pdev->dev);
	}

odbfd_exit1:
	kfree(hwmods);
odbfd_exit:
	/* if data/we are at fault.. load up a fail handler */
	if (ret)
		pdev->dev.pm_domain = &omap_device_fail_pm_domain;

	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);
		omap_auxdata_legacy_init(dev);
		/* fall through */
	default:
		od = to_omap_device(pdev);
		if (od)
			od->_driver_status = event;
	}

	return NOTIFY_DONE;
}

/**
 * _omap_device_enable_hwmods - call omap_hwmod_enable() on all hwmods
 * @od: struct omap_device *od
 *
 * Enable all underlying hwmods.  Returns 0.
 */
static 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.
 */
static 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;
}

/* 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 *
 * @flags: Type of resources to include when counting (IRQ/DMA/MEM)
 *
 * 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,
				       unsigned long flags)
{
	int c = 0;
	int i;

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

	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
 *
 * Convenience function for allocating an omap_device structure and filling
 * hwmods, and resources.
 *
 * 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)
{
	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;

	/*
	 * Non-DT Boot:
	 *   Here, pdev->num_resources = 0, and we should get all the
	 *   resources from hwmod.
	 *
	 * 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).
	 *   As preparation for the future we examine the OF provided resources
	 *   to see if we have DMA resources provided already. In this case
	 *   there is no need to update the resources for the device, we use the
	 *   OF provided ones.
	 *
	 * TODO: Once DMA resource is available from OF layer, we should
	 *   kill filling any resources from hwmod.
	 */
	if (!pdev->num_resources) {
		/* Count all resources for the device */
		res_count = omap_device_count_resources(od, IORESOURCE_IRQ |
							    IORESOURCE_DMA |
							    IORESOURCE_MEM);
	} else {
		/* Take a look if we already have DMA resource via DT */
		for (i = 0; i < pdev->num_resources; i++) {
			struct resource *r = &pdev->resource[i];

			/* We have it, no need to touch the resources */
			if (r->flags == IORESOURCE_DMA)
				goto have_everything;
		}
		/* Count only DMA resources for the device */
		res_count = omap_device_count_resources(od, IORESOURCE_DMA);
		/* The device has no DMA resource, no need for update */
		if (!res_count)
			goto have_everything;

		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) {
		dev_dbg(&pdev->dev, "%s: using %d resources from hwmod\n",
			__func__, res_count);
		omap_device_fill_resources(od, res);
	} else {
		dev_dbg(&pdev->dev,
			"%s: appending %d DMA resources from hwmod\n",
			__func__, res_count - pdev->num_resources);
		memcpy(res, pdev->resource,
		       sizeof(struct resource) * pdev->num_resources);
		_od_fill_dma_resources(od, &res[pdev->num_resources]);
	}

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

	if (ret)
		goto oda_exit3;

have_everything:
	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->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
 *
 * 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_hwmod *ohs[] = { oh };

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

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

/**
 * 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
 *
 * 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)
{
	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);
	if (IS_ERR(od))
		goto odbs_exit1;

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

	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);
}

#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_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);

	omap_device_enable(pdev);

	return pm_generic_runtime_resume(dev);
}

static int _od_fail_runtime_suspend(struct device *dev)
{
	dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
	return -ENODEV;
}

static int _od_fail_runtime_resume(struct device *dev)
{
	dev_warn(dev, "%s: FIXME: missing hwmod/omap_dev info\n", __func__);
	return -ENODEV;
}

#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) {
			pm_runtime_set_suspended(dev);
			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) {
		od->flags &= ~OMAP_DEVICE_SUSPENDED;
		omap_device_enable(pdev);
		/*
		 * XXX: we run before core runtime pm has resumed itself. At
		 * this point in time, we just restore the runtime pm state and
		 * considering symmetric operations in resume, we donot expect
		 * to fail. If we failed, something changed in core runtime_pm
		 * framework OR some device driver messed things up, hence, WARN
		 */
		WARN(pm_runtime_set_active(dev),
		     "Could not set %s runtime state active\n", dev_name(dev));
		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_fail_pm_domain = {
	.ops = {
		SET_RUNTIME_PM_OPS(_od_fail_runtime_suspend,
				   _od_fail_runtime_resume, NULL)
	}
};

struct dev_pm_domain omap_device_pm_domain = {
	.ops = {
		SET_RUNTIME_PM_OPS(_od_runtime_suspend, _od_runtime_resume,
				   NULL)
		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
 * indirectly via pm_runtime_get*().  Returns -EINVAL if called when
 * the omap_device is already enabled, or passes along the return
 * value of _omap_device_enable_hwmods().
 */
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;
	}

	ret = _omap_device_enable_hwmods(od);

	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.  Device drivers call this function indirectly
 * via pm_runtime_put*().  Returns -EINVAL if the omap_device is not
 * currently enabled, or passes along the return value of
 * _omap_device_idle_hwmods().
 */
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_idle_hwmods(od);

	od->_state = OMAP_DEVICE_STATE_IDLE;

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

	return &oh->od->pdev->dev;
}

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;
}
omap_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);
	int i;

	if (!od)
		return 0;

	/*
	 * If omap_device state is enabled, but has no driver bound,
	 * idle it.
	 */

	/*
	 * Some devices (like memory controllers) are always kept
	 * enabled, and should not be idled even with no drivers.
	 */
	for (i = 0; i < od->hwmods_cnt; i++)
		if (od->hwmods[i]->flags & HWMOD_INIT_NO_IDLE)
			return 0;

	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;
}
omap_late_initcall_sync(omap_device_late_init);