summaryrefslogtreecommitdiffstats
path: root/drivers/bus/fsl-mc/fsl-mc-bus.c
blob: 40526da5c6a6efb0c763aaa06ada4f3dd2988844 (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
// SPDX-License-Identifier: GPL-2.0
/*
 * Freescale Management Complex (MC) bus driver
 *
 * Copyright (C) 2014-2016 Freescale Semiconductor, Inc.
 * Author: German Rivera <German.Rivera@freescale.com>
 *
 */

#define pr_fmt(fmt) "fsl-mc: " fmt

#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/limits.h>
#include <linux/bitops.h>
#include <linux/msi.h>
#include <linux/dma-mapping.h>

#include "fsl-mc-private.h"

/**
 * Default DMA mask for devices on a fsl-mc bus
 */
#define FSL_MC_DEFAULT_DMA_MASK	(~0ULL)

static struct fsl_mc_version mc_version;

/**
 * struct fsl_mc - Private data of a "fsl,qoriq-mc" platform device
 * @root_mc_bus_dev: fsl-mc device representing the root DPRC
 * @num_translation_ranges: number of entries in addr_translation_ranges
 * @translation_ranges: array of bus to system address translation ranges
 */
struct fsl_mc {
	struct fsl_mc_device *root_mc_bus_dev;
	u8 num_translation_ranges;
	struct fsl_mc_addr_translation_range *translation_ranges;
};

/**
 * struct fsl_mc_addr_translation_range - bus to system address translation
 * range
 * @mc_region_type: Type of MC region for the range being translated
 * @start_mc_offset: Start MC offset of the range being translated
 * @end_mc_offset: MC offset of the first byte after the range (last MC
 * offset of the range is end_mc_offset - 1)
 * @start_phys_addr: system physical address corresponding to start_mc_addr
 */
struct fsl_mc_addr_translation_range {
	enum dprc_region_type mc_region_type;
	u64 start_mc_offset;
	u64 end_mc_offset;
	phys_addr_t start_phys_addr;
};

/**
 * fsl_mc_bus_match - device to driver matching callback
 * @dev: the fsl-mc device to match against
 * @drv: the device driver to search for matching fsl-mc object type
 * structures
 *
 * Returns 1 on success, 0 otherwise.
 */
static int fsl_mc_bus_match(struct device *dev, struct device_driver *drv)
{
	const struct fsl_mc_device_id *id;
	struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
	struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(drv);
	bool found = false;

	if (!mc_drv->match_id_table)
		goto out;

	/*
	 * If the object is not 'plugged' don't match.
	 * Only exception is the root DPRC, which is a special case.
	 */
	if ((mc_dev->obj_desc.state & FSL_MC_OBJ_STATE_PLUGGED) == 0 &&
	    !fsl_mc_is_root_dprc(&mc_dev->dev))
		goto out;

	/*
	 * Traverse the match_id table of the given driver, trying to find
	 * a matching for the given device.
	 */
	for (id = mc_drv->match_id_table; id->vendor != 0x0; id++) {
		if (id->vendor == mc_dev->obj_desc.vendor &&
		    strcmp(id->obj_type, mc_dev->obj_desc.type) == 0) {
			found = true;

			break;
		}
	}

out:
	dev_dbg(dev, "%smatched\n", found ? "" : "not ");
	return found;
}

/**
 * fsl_mc_bus_uevent - callback invoked when a device is added
 */
static int fsl_mc_bus_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);

	if (add_uevent_var(env, "MODALIAS=fsl-mc:v%08Xd%s",
			   mc_dev->obj_desc.vendor,
			   mc_dev->obj_desc.type))
		return -ENOMEM;

	return 0;
}

static int fsl_mc_dma_configure(struct device *dev)
{
	struct device *dma_dev = dev;

	while (dev_is_fsl_mc(dma_dev))
		dma_dev = dma_dev->parent;

	return of_dma_configure(dev, dma_dev->of_node, 0);
}

static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
			     char *buf)
{
	struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);

	return sprintf(buf, "fsl-mc:v%08Xd%s\n", mc_dev->obj_desc.vendor,
		       mc_dev->obj_desc.type);
}
static DEVICE_ATTR_RO(modalias);

static struct attribute *fsl_mc_dev_attrs[] = {
	&dev_attr_modalias.attr,
	NULL,
};

ATTRIBUTE_GROUPS(fsl_mc_dev);

struct bus_type fsl_mc_bus_type = {
	.name = "fsl-mc",
	.match = fsl_mc_bus_match,
	.uevent = fsl_mc_bus_uevent,
	.dma_configure  = fsl_mc_dma_configure,
	.dev_groups = fsl_mc_dev_groups,
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_type);

struct device_type fsl_mc_bus_dprc_type = {
	.name = "fsl_mc_bus_dprc"
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_dprc_type);

struct device_type fsl_mc_bus_dpni_type = {
	.name = "fsl_mc_bus_dpni"
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_dpni_type);

struct device_type fsl_mc_bus_dpio_type = {
	.name = "fsl_mc_bus_dpio"
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_dpio_type);

struct device_type fsl_mc_bus_dpsw_type = {
	.name = "fsl_mc_bus_dpsw"
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_dpsw_type);

struct device_type fsl_mc_bus_dpbp_type = {
	.name = "fsl_mc_bus_dpbp"
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_dpbp_type);

struct device_type fsl_mc_bus_dpcon_type = {
	.name = "fsl_mc_bus_dpcon"
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_dpcon_type);

struct device_type fsl_mc_bus_dpmcp_type = {
	.name = "fsl_mc_bus_dpmcp"
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_dpmcp_type);

struct device_type fsl_mc_bus_dpmac_type = {
	.name = "fsl_mc_bus_dpmac"
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_dpmac_type);

struct device_type fsl_mc_bus_dprtc_type = {
	.name = "fsl_mc_bus_dprtc"
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_dprtc_type);

struct device_type fsl_mc_bus_dpseci_type = {
	.name = "fsl_mc_bus_dpseci"
};
EXPORT_SYMBOL_GPL(fsl_mc_bus_dpseci_type);

static struct device_type *fsl_mc_get_device_type(const char *type)
{
	static const struct {
		struct device_type *dev_type;
		const char *type;
	} dev_types[] = {
		{ &fsl_mc_bus_dprc_type, "dprc" },
		{ &fsl_mc_bus_dpni_type, "dpni" },
		{ &fsl_mc_bus_dpio_type, "dpio" },
		{ &fsl_mc_bus_dpsw_type, "dpsw" },
		{ &fsl_mc_bus_dpbp_type, "dpbp" },
		{ &fsl_mc_bus_dpcon_type, "dpcon" },
		{ &fsl_mc_bus_dpmcp_type, "dpmcp" },
		{ &fsl_mc_bus_dpmac_type, "dpmac" },
		{ &fsl_mc_bus_dprtc_type, "dprtc" },
		{ &fsl_mc_bus_dpseci_type, "dpseci" },
		{ NULL, NULL }
	};
	int i;

	for (i = 0; dev_types[i].dev_type; i++)
		if (!strcmp(dev_types[i].type, type))
			return dev_types[i].dev_type;

	return NULL;
}

static int fsl_mc_driver_probe(struct device *dev)
{
	struct fsl_mc_driver *mc_drv;
	struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
	int error;

	mc_drv = to_fsl_mc_driver(dev->driver);

	error = mc_drv->probe(mc_dev);
	if (error < 0) {
		if (error != -EPROBE_DEFER)
			dev_err(dev, "%s failed: %d\n", __func__, error);
		return error;
	}

	return 0;
}

static int fsl_mc_driver_remove(struct device *dev)
{
	struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(dev->driver);
	struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);
	int error;

	error = mc_drv->remove(mc_dev);
	if (error < 0) {
		dev_err(dev, "%s failed: %d\n", __func__, error);
		return error;
	}

	return 0;
}

static void fsl_mc_driver_shutdown(struct device *dev)
{
	struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(dev->driver);
	struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);

	mc_drv->shutdown(mc_dev);
}

/**
 * __fsl_mc_driver_register - registers a child device driver with the
 * MC bus
 *
 * This function is implicitly invoked from the registration function of
 * fsl_mc device drivers, which is generated by the
 * module_fsl_mc_driver() macro.
 */
int __fsl_mc_driver_register(struct fsl_mc_driver *mc_driver,
			     struct module *owner)
{
	int error;

	mc_driver->driver.owner = owner;
	mc_driver->driver.bus = &fsl_mc_bus_type;

	if (mc_driver->probe)
		mc_driver->driver.probe = fsl_mc_driver_probe;

	if (mc_driver->remove)
		mc_driver->driver.remove = fsl_mc_driver_remove;

	if (mc_driver->shutdown)
		mc_driver->driver.shutdown = fsl_mc_driver_shutdown;

	error = driver_register(&mc_driver->driver);
	if (error < 0) {
		pr_err("driver_register() failed for %s: %d\n",
		       mc_driver->driver.name, error);
		return error;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(__fsl_mc_driver_register);

/**
 * fsl_mc_driver_unregister - unregisters a device driver from the
 * MC bus
 */
void fsl_mc_driver_unregister(struct fsl_mc_driver *mc_driver)
{
	driver_unregister(&mc_driver->driver);
}
EXPORT_SYMBOL_GPL(fsl_mc_driver_unregister);

/**
 * mc_get_version() - Retrieves the Management Complex firmware
 *			version information
 * @mc_io:		Pointer to opaque I/O object
 * @cmd_flags:		Command flags; one or more of 'MC_CMD_FLAG_'
 * @mc_ver_info:	Returned version information structure
 *
 * Return:	'0' on Success; Error code otherwise.
 */
static int mc_get_version(struct fsl_mc_io *mc_io,
			  u32 cmd_flags,
			  struct fsl_mc_version *mc_ver_info)
{
	struct fsl_mc_command cmd = { 0 };
	struct dpmng_rsp_get_version *rsp_params;
	int err;

	/* prepare command */
	cmd.header = mc_encode_cmd_header(DPMNG_CMDID_GET_VERSION,
					  cmd_flags,
					  0);

	/* send command to mc*/
	err = mc_send_command(mc_io, &cmd);
	if (err)
		return err;

	/* retrieve response parameters */
	rsp_params = (struct dpmng_rsp_get_version *)cmd.params;
	mc_ver_info->revision = le32_to_cpu(rsp_params->revision);
	mc_ver_info->major = le32_to_cpu(rsp_params->version_major);
	mc_ver_info->minor = le32_to_cpu(rsp_params->version_minor);

	return 0;
}

/**
 * fsl_mc_get_version - function to retrieve the MC f/w version information
 *
 * Return:	mc version when called after fsl-mc-bus probe; NULL otherwise.
 */
struct fsl_mc_version *fsl_mc_get_version(void)
{
	if (mc_version.major)
		return &mc_version;

	return NULL;
}
EXPORT_SYMBOL_GPL(fsl_mc_get_version);

/**
 * fsl_mc_get_root_dprc - function to traverse to the root dprc
 */
static void fsl_mc_get_root_dprc(struct device *dev,
				 struct device **root_dprc_dev)
{
	if (!dev) {
		*root_dprc_dev = NULL;
	} else if (!dev_is_fsl_mc(dev)) {
		*root_dprc_dev = NULL;
	} else {
		*root_dprc_dev = dev;
		while (dev_is_fsl_mc((*root_dprc_dev)->parent))
			*root_dprc_dev = (*root_dprc_dev)->parent;
	}
}

static int get_dprc_attr(struct fsl_mc_io *mc_io,
			 int container_id, struct dprc_attributes *attr)
{
	u16 dprc_handle;
	int error;

	error = dprc_open(mc_io, 0, container_id, &dprc_handle);
	if (error < 0) {
		dev_err(mc_io->dev, "dprc_open() failed: %d\n", error);
		return error;
	}

	memset(attr, 0, sizeof(struct dprc_attributes));
	error = dprc_get_attributes(mc_io, 0, dprc_handle, attr);
	if (error < 0) {
		dev_err(mc_io->dev, "dprc_get_attributes() failed: %d\n",
			error);
		goto common_cleanup;
	}

	error = 0;

common_cleanup:
	(void)dprc_close(mc_io, 0, dprc_handle);
	return error;
}

static int get_dprc_icid(struct fsl_mc_io *mc_io,
			 int container_id, u16 *icid)
{
	struct dprc_attributes attr;
	int error;

	error = get_dprc_attr(mc_io, container_id, &attr);
	if (error == 0)
		*icid = attr.icid;

	return error;
}

static int translate_mc_addr(struct fsl_mc_device *mc_dev,
			     enum dprc_region_type mc_region_type,
			     u64 mc_offset, phys_addr_t *phys_addr)
{
	int i;
	struct device *root_dprc_dev;
	struct fsl_mc *mc;

	fsl_mc_get_root_dprc(&mc_dev->dev, &root_dprc_dev);
	mc = dev_get_drvdata(root_dprc_dev->parent);

	if (mc->num_translation_ranges == 0) {
		/*
		 * Do identity mapping:
		 */
		*phys_addr = mc_offset;
		return 0;
	}

	for (i = 0; i < mc->num_translation_ranges; i++) {
		struct fsl_mc_addr_translation_range *range =
			&mc->translation_ranges[i];

		if (mc_region_type == range->mc_region_type &&
		    mc_offset >= range->start_mc_offset &&
		    mc_offset < range->end_mc_offset) {
			*phys_addr = range->start_phys_addr +
				     (mc_offset - range->start_mc_offset);
			return 0;
		}
	}

	return -EFAULT;
}

static int fsl_mc_device_get_mmio_regions(struct fsl_mc_device *mc_dev,
					  struct fsl_mc_device *mc_bus_dev)
{
	int i;
	int error;
	struct resource *regions;
	struct fsl_mc_obj_desc *obj_desc = &mc_dev->obj_desc;
	struct device *parent_dev = mc_dev->dev.parent;
	enum dprc_region_type mc_region_type;

	if (is_fsl_mc_bus_dprc(mc_dev) ||
	    is_fsl_mc_bus_dpmcp(mc_dev)) {
		mc_region_type = DPRC_REGION_TYPE_MC_PORTAL;
	} else if (is_fsl_mc_bus_dpio(mc_dev)) {
		mc_region_type = DPRC_REGION_TYPE_QBMAN_PORTAL;
	} else {
		/*
		 * This function should not have been called for this MC object
		 * type, as this object type is not supposed to have MMIO
		 * regions
		 */
		return -EINVAL;
	}

	regions = kmalloc_array(obj_desc->region_count,
				sizeof(regions[0]), GFP_KERNEL);
	if (!regions)
		return -ENOMEM;

	for (i = 0; i < obj_desc->region_count; i++) {
		struct dprc_region_desc region_desc;

		error = dprc_get_obj_region(mc_bus_dev->mc_io,
					    0,
					    mc_bus_dev->mc_handle,
					    obj_desc->type,
					    obj_desc->id, i, &region_desc);
		if (error < 0) {
			dev_err(parent_dev,
				"dprc_get_obj_region() failed: %d\n", error);
			goto error_cleanup_regions;
		}
		/*
		 * Older MC only returned region offset and no base address
		 * If base address is in the region_desc use it otherwise
		 * revert to old mechanism
		 */
		if (region_desc.base_address)
			regions[i].start = region_desc.base_address +
						region_desc.base_offset;
		else
			error = translate_mc_addr(mc_dev, mc_region_type,
					  region_desc.base_offset,
					  &regions[i].start);

		if (error < 0) {
			dev_err(parent_dev,
				"Invalid MC offset: %#x (for %s.%d\'s region %d)\n",
				region_desc.base_offset,
				obj_desc->type, obj_desc->id, i);
			goto error_cleanup_regions;
		}

		regions[i].end = regions[i].start + region_desc.size - 1;
		regions[i].name = "fsl-mc object MMIO region";
		regions[i].flags = IORESOURCE_IO;
		if (region_desc.flags & DPRC_REGION_CACHEABLE)
			regions[i].flags |= IORESOURCE_CACHEABLE;
		if (region_desc.flags & DPRC_REGION_SHAREABLE)
			regions[i].flags |= IORESOURCE_MEM;
	}

	mc_dev->regions = regions;
	return 0;

error_cleanup_regions:
	kfree(regions);
	return error;
}

/**
 * fsl_mc_is_root_dprc - function to check if a given device is a root dprc
 */
bool fsl_mc_is_root_dprc(struct device *dev)
{
	struct device *root_dprc_dev;

	fsl_mc_get_root_dprc(dev, &root_dprc_dev);
	if (!root_dprc_dev)
		return false;
	return dev == root_dprc_dev;
}

static void fsl_mc_device_release(struct device *dev)
{
	struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev);

	kfree(mc_dev->regions);

	if (is_fsl_mc_bus_dprc(mc_dev))
		kfree(to_fsl_mc_bus(mc_dev));
	else
		kfree(mc_dev);
}

/**
 * Add a newly discovered fsl-mc device to be visible in Linux
 */
int fsl_mc_device_add(struct fsl_mc_obj_desc *obj_desc,
		      struct fsl_mc_io *mc_io,
		      struct device *parent_dev,
		      struct fsl_mc_device **new_mc_dev)
{
	int error;
	struct fsl_mc_device *mc_dev = NULL;
	struct fsl_mc_bus *mc_bus = NULL;
	struct fsl_mc_device *parent_mc_dev;

	if (dev_is_fsl_mc(parent_dev))
		parent_mc_dev = to_fsl_mc_device(parent_dev);
	else
		parent_mc_dev = NULL;

	if (strcmp(obj_desc->type, "dprc") == 0) {
		/*
		 * Allocate an MC bus device object:
		 */
		mc_bus = kzalloc(sizeof(*mc_bus), GFP_KERNEL);
		if (!mc_bus)
			return -ENOMEM;

		mc_dev = &mc_bus->mc_dev;
	} else {
		/*
		 * Allocate a regular fsl_mc_device object:
		 */
		mc_dev = kzalloc(sizeof(*mc_dev), GFP_KERNEL);
		if (!mc_dev)
			return -ENOMEM;
	}

	mc_dev->obj_desc = *obj_desc;
	mc_dev->mc_io = mc_io;
	device_initialize(&mc_dev->dev);
	mc_dev->dev.parent = parent_dev;
	mc_dev->dev.bus = &fsl_mc_bus_type;
	mc_dev->dev.release = fsl_mc_device_release;
	mc_dev->dev.type = fsl_mc_get_device_type(obj_desc->type);
	if (!mc_dev->dev.type) {
		error = -ENODEV;
		dev_err(parent_dev, "unknown device type %s\n", obj_desc->type);
		goto error_cleanup_dev;
	}
	dev_set_name(&mc_dev->dev, "%s.%d", obj_desc->type, obj_desc->id);

	if (strcmp(obj_desc->type, "dprc") == 0) {
		struct fsl_mc_io *mc_io2;

		mc_dev->flags |= FSL_MC_IS_DPRC;

		/*
		 * To get the DPRC's ICID, we need to open the DPRC
		 * in get_dprc_icid(). For child DPRCs, we do so using the
		 * parent DPRC's MC portal instead of the child DPRC's MC
		 * portal, in case the child DPRC is already opened with
		 * its own portal (e.g., the DPRC used by AIOP).
		 *
		 * NOTE: There cannot be more than one active open for a
		 * given MC object, using the same MC portal.
		 */
		if (parent_mc_dev) {
			/*
			 * device being added is a child DPRC device
			 */
			mc_io2 = parent_mc_dev->mc_io;
		} else {
			/*
			 * device being added is the root DPRC device
			 */
			if (!mc_io) {
				error = -EINVAL;
				goto error_cleanup_dev;
			}

			mc_io2 = mc_io;
		}

		error = get_dprc_icid(mc_io2, obj_desc->id, &mc_dev->icid);
		if (error < 0)
			goto error_cleanup_dev;
	} else {
		/*
		 * A non-DPRC object has to be a child of a DPRC, use the
		 * parent's ICID and interrupt domain.
		 */
		mc_dev->icid = parent_mc_dev->icid;
		mc_dev->dma_mask = FSL_MC_DEFAULT_DMA_MASK;
		mc_dev->dev.dma_mask = &mc_dev->dma_mask;
		mc_dev->dev.coherent_dma_mask = mc_dev->dma_mask;
		dev_set_msi_domain(&mc_dev->dev,
				   dev_get_msi_domain(&parent_mc_dev->dev));
	}

	/*
	 * Get MMIO regions for the device from the MC:
	 *
	 * NOTE: the root DPRC is a special case as its MMIO region is
	 * obtained from the device tree
	 */
	if (parent_mc_dev && obj_desc->region_count != 0) {
		error = fsl_mc_device_get_mmio_regions(mc_dev,
						       parent_mc_dev);
		if (error < 0)
			goto error_cleanup_dev;
	}

	/*
	 * The device-specific probe callback will get invoked by device_add()
	 */
	error = device_add(&mc_dev->dev);
	if (error < 0) {
		dev_err(parent_dev,
			"device_add() failed for device %s: %d\n",
			dev_name(&mc_dev->dev), error);
		goto error_cleanup_dev;
	}

	dev_dbg(parent_dev, "added %s\n", dev_name(&mc_dev->dev));

	*new_mc_dev = mc_dev;
	return 0;

error_cleanup_dev:
	kfree(mc_dev->regions);
	kfree(mc_bus);
	kfree(mc_dev);

	return error;
}
EXPORT_SYMBOL_GPL(fsl_mc_device_add);

/**
 * fsl_mc_device_remove - Remove an fsl-mc device from being visible to
 * Linux
 *
 * @mc_dev: Pointer to an fsl-mc device
 */
void fsl_mc_device_remove(struct fsl_mc_device *mc_dev)
{
	/*
	 * The device-specific remove callback will get invoked by device_del()
	 */
	device_del(&mc_dev->dev);
	put_device(&mc_dev->dev);
}
EXPORT_SYMBOL_GPL(fsl_mc_device_remove);

struct fsl_mc_device *fsl_mc_get_endpoint(struct fsl_mc_device *mc_dev)
{
	struct fsl_mc_device *mc_bus_dev, *endpoint;
	struct fsl_mc_obj_desc endpoint_desc = {{ 0 }};
	struct dprc_endpoint endpoint1 = {{ 0 }};
	struct dprc_endpoint endpoint2 = {{ 0 }};
	int state, err;

	mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent);
	strcpy(endpoint1.type, mc_dev->obj_desc.type);
	endpoint1.id = mc_dev->obj_desc.id;

	err = dprc_get_connection(mc_bus_dev->mc_io, 0,
				  mc_bus_dev->mc_handle,
				  &endpoint1, &endpoint2,
				  &state);

	if (err == -ENOTCONN || state == -1)
		return ERR_PTR(-ENOTCONN);

	if (err < 0) {
		dev_err(&mc_bus_dev->dev, "dprc_get_connection() = %d\n", err);
		return ERR_PTR(err);
	}

	strcpy(endpoint_desc.type, endpoint2.type);
	endpoint_desc.id = endpoint2.id;
	endpoint = fsl_mc_device_lookup(&endpoint_desc, mc_bus_dev);

	return endpoint;
}
EXPORT_SYMBOL_GPL(fsl_mc_get_endpoint);

static int parse_mc_ranges(struct device *dev,
			   int *paddr_cells,
			   int *mc_addr_cells,
			   int *mc_size_cells,
			   const __be32 **ranges_start)
{
	const __be32 *prop;
	int range_tuple_cell_count;
	int ranges_len;
	int tuple_len;
	struct device_node *mc_node = dev->of_node;

	*ranges_start = of_get_property(mc_node, "ranges", &ranges_len);
	if (!(*ranges_start) || !ranges_len) {
		dev_warn(dev,
			 "missing or empty ranges property for device tree node '%pOFn'\n",
			 mc_node);
		return 0;
	}

	*paddr_cells = of_n_addr_cells(mc_node);

	prop = of_get_property(mc_node, "#address-cells", NULL);
	if (prop)
		*mc_addr_cells = be32_to_cpup(prop);
	else
		*mc_addr_cells = *paddr_cells;

	prop = of_get_property(mc_node, "#size-cells", NULL);
	if (prop)
		*mc_size_cells = be32_to_cpup(prop);
	else
		*mc_size_cells = of_n_size_cells(mc_node);

	range_tuple_cell_count = *paddr_cells + *mc_addr_cells +
				 *mc_size_cells;

	tuple_len = range_tuple_cell_count * sizeof(__be32);
	if (ranges_len % tuple_len != 0) {
		dev_err(dev, "malformed ranges property '%pOFn'\n", mc_node);
		return -EINVAL;
	}

	return ranges_len / tuple_len;
}

static int get_mc_addr_translation_ranges(struct device *dev,
					  struct fsl_mc_addr_translation_range
						**ranges,
					  u8 *num_ranges)
{
	int ret;
	int paddr_cells;
	int mc_addr_cells;
	int mc_size_cells;
	int i;
	const __be32 *ranges_start;
	const __be32 *cell;

	ret = parse_mc_ranges(dev,
			      &paddr_cells,
			      &mc_addr_cells,
			      &mc_size_cells,
			      &ranges_start);
	if (ret < 0)
		return ret;

	*num_ranges = ret;
	if (!ret) {
		/*
		 * Missing or empty ranges property ("ranges;") for the
		 * 'fsl,qoriq-mc' node. In this case, identity mapping
		 * will be used.
		 */
		*ranges = NULL;
		return 0;
	}

	*ranges = devm_kcalloc(dev, *num_ranges,
			       sizeof(struct fsl_mc_addr_translation_range),
			       GFP_KERNEL);
	if (!(*ranges))
		return -ENOMEM;

	cell = ranges_start;
	for (i = 0; i < *num_ranges; ++i) {
		struct fsl_mc_addr_translation_range *range = &(*ranges)[i];

		range->mc_region_type = of_read_number(cell, 1);
		range->start_mc_offset = of_read_number(cell + 1,
							mc_addr_cells - 1);
		cell += mc_addr_cells;
		range->start_phys_addr = of_read_number(cell, paddr_cells);
		cell += paddr_cells;
		range->end_mc_offset = range->start_mc_offset +
				     of_read_number(cell, mc_size_cells);

		cell += mc_size_cells;
	}

	return 0;
}

/**
 * fsl_mc_bus_probe - callback invoked when the root MC bus is being
 * added
 */
static int fsl_mc_bus_probe(struct platform_device *pdev)
{
	struct fsl_mc_obj_desc obj_desc;
	int error;
	struct fsl_mc *mc;
	struct fsl_mc_device *mc_bus_dev = NULL;
	struct fsl_mc_io *mc_io = NULL;
	int container_id;
	phys_addr_t mc_portal_phys_addr;
	u32 mc_portal_size;
	struct resource res;

	mc = devm_kzalloc(&pdev->dev, sizeof(*mc), GFP_KERNEL);
	if (!mc)
		return -ENOMEM;

	platform_set_drvdata(pdev, mc);

	/*
	 * Get physical address of MC portal for the root DPRC:
	 */
	error = of_address_to_resource(pdev->dev.of_node, 0, &res);
	if (error < 0) {
		dev_err(&pdev->dev,
			"of_address_to_resource() failed for %pOF\n",
			pdev->dev.of_node);
		return error;
	}

	mc_portal_phys_addr = res.start;
	mc_portal_size = resource_size(&res);
	error = fsl_create_mc_io(&pdev->dev, mc_portal_phys_addr,
				 mc_portal_size, NULL,
				 FSL_MC_IO_ATOMIC_CONTEXT_PORTAL, &mc_io);
	if (error < 0)
		return error;

	error = mc_get_version(mc_io, 0, &mc_version);
	if (error != 0) {
		dev_err(&pdev->dev,
			"mc_get_version() failed with error %d\n", error);
		goto error_cleanup_mc_io;
	}

	dev_info(&pdev->dev, "MC firmware version: %u.%u.%u\n",
		 mc_version.major, mc_version.minor, mc_version.revision);

	error = get_mc_addr_translation_ranges(&pdev->dev,
					       &mc->translation_ranges,
					       &mc->num_translation_ranges);
	if (error < 0)
		goto error_cleanup_mc_io;

	error = dprc_get_container_id(mc_io, 0, &container_id);
	if (error < 0) {
		dev_err(&pdev->dev,
			"dprc_get_container_id() failed: %d\n", error);
		goto error_cleanup_mc_io;
	}

	memset(&obj_desc, 0, sizeof(struct fsl_mc_obj_desc));
	error = dprc_get_api_version(mc_io, 0,
				     &obj_desc.ver_major,
				     &obj_desc.ver_minor);
	if (error < 0)
		goto error_cleanup_mc_io;

	obj_desc.vendor = FSL_MC_VENDOR_FREESCALE;
	strcpy(obj_desc.type, "dprc");
	obj_desc.id = container_id;
	obj_desc.irq_count = 1;
	obj_desc.region_count = 0;

	error = fsl_mc_device_add(&obj_desc, mc_io, &pdev->dev, &mc_bus_dev);
	if (error < 0)
		goto error_cleanup_mc_io;

	mc->root_mc_bus_dev = mc_bus_dev;
	return 0;

error_cleanup_mc_io:
	fsl_destroy_mc_io(mc_io);
	return error;
}

/**
 * fsl_mc_bus_remove - callback invoked when the root MC bus is being
 * removed
 */
static int fsl_mc_bus_remove(struct platform_device *pdev)
{
	struct fsl_mc *mc = platform_get_drvdata(pdev);

	if (!fsl_mc_is_root_dprc(&mc->root_mc_bus_dev->dev))
		return -EINVAL;

	fsl_mc_device_remove(mc->root_mc_bus_dev);

	fsl_destroy_mc_io(mc->root_mc_bus_dev->mc_io);
	mc->root_mc_bus_dev->mc_io = NULL;

	return 0;
}

static const struct of_device_id fsl_mc_bus_match_table[] = {
	{.compatible = "fsl,qoriq-mc",},
	{},
};

MODULE_DEVICE_TABLE(of, fsl_mc_bus_match_table);

static struct platform_driver fsl_mc_bus_driver = {
	.driver = {
		   .name = "fsl_mc_bus",
		   .pm = NULL,
		   .of_match_table = fsl_mc_bus_match_table,
		   },
	.probe = fsl_mc_bus_probe,
	.remove = fsl_mc_bus_remove,
};

static int __init fsl_mc_bus_driver_init(void)
{
	int error;

	error = bus_register(&fsl_mc_bus_type);
	if (error < 0) {
		pr_err("bus type registration failed: %d\n", error);
		goto error_cleanup_cache;
	}

	error = platform_driver_register(&fsl_mc_bus_driver);
	if (error < 0) {
		pr_err("platform_driver_register() failed: %d\n", error);
		goto error_cleanup_bus;
	}

	error = dprc_driver_init();
	if (error < 0)
		goto error_cleanup_driver;

	error = fsl_mc_allocator_driver_init();
	if (error < 0)
		goto error_cleanup_dprc_driver;

	return 0;

error_cleanup_dprc_driver:
	dprc_driver_exit();

error_cleanup_driver:
	platform_driver_unregister(&fsl_mc_bus_driver);

error_cleanup_bus:
	bus_unregister(&fsl_mc_bus_type);

error_cleanup_cache:
	return error;
}
postcore_initcall(fsl_mc_bus_driver_init);