summaryrefslogtreecommitdiff
path: root/include/fdtdec.h
blob: 9fcc7a1e19997cbf729df718c268e8141b22d625 (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
/*
 * Copyright (c) 2011 The Chromium OS Authors.
 * SPDX-License-Identifier:	GPL-2.0+
 */

#ifndef __fdtdec_h
#define __fdtdec_h

/*
 * This file contains convenience functions for decoding useful and
 * enlightening information from FDTs. It is intended to be used by device
 * drivers and board-specific code within U-Boot. It aims to reduce the
 * amount of FDT munging required within U-Boot itself, so that driver code
 * changes to support FDT are minimized.
 */

#include <libfdt.h>
#include <pci.h>

/*
 * A typedef for a physical address. Note that fdt data is always big
 * endian even on a litle endian machine.
 */
typedef phys_addr_t fdt_addr_t;
typedef phys_size_t fdt_size_t;
#ifdef CONFIG_PHYS_64BIT
#define FDT_ADDR_T_NONE (-1ULL)
#define fdt_addr_to_cpu(reg) be64_to_cpu(reg)
#define fdt_size_to_cpu(reg) be64_to_cpu(reg)
#else
#define FDT_ADDR_T_NONE (-1U)
#define fdt_addr_to_cpu(reg) be32_to_cpu(reg)
#define fdt_size_to_cpu(reg) be32_to_cpu(reg)
#endif

/* Information obtained about memory from the FDT */
struct fdt_memory {
	fdt_addr_t start;
	fdt_addr_t end;
};

#ifdef CONFIG_SPL_BUILD
#define SPL_BUILD	1
#else
#define SPL_BUILD	0
#endif

/*
 * Information about a resource. start is the first address of the resource
 * and end is the last address (inclusive). The length of the resource will
 * be equal to: end - start + 1.
 */
struct fdt_resource {
	fdt_addr_t start;
	fdt_addr_t end;
};

enum fdt_pci_space {
	FDT_PCI_SPACE_CONFIG = 0,
	FDT_PCI_SPACE_IO = 0x01000000,
	FDT_PCI_SPACE_MEM32 = 0x02000000,
	FDT_PCI_SPACE_MEM64 = 0x03000000,
	FDT_PCI_SPACE_MEM32_PREF = 0x42000000,
	FDT_PCI_SPACE_MEM64_PREF = 0x43000000,
};

#define FDT_PCI_ADDR_CELLS	3
#define FDT_PCI_SIZE_CELLS	2
#define FDT_PCI_REG_SIZE	\
	((FDT_PCI_ADDR_CELLS + FDT_PCI_SIZE_CELLS) * sizeof(u32))

/*
 * The Open Firmware spec defines PCI physical address as follows:
 *
 *          bits# 31 .... 24 23 .... 16 15 .... 08 07 .... 00
 *
 * phys.hi  cell:  npt000ss   bbbbbbbb   dddddfff   rrrrrrrr
 * phys.mid cell:  hhhhhhhh   hhhhhhhh   hhhhhhhh   hhhhhhhh
 * phys.lo  cell:  llllllll   llllllll   llllllll   llllllll
 *
 * where:
 *
 * n:        is 0 if the address is relocatable, 1 otherwise
 * p:        is 1 if addressable region is prefetchable, 0 otherwise
 * t:        is 1 if the address is aliased (for non-relocatable I/O) below 1MB
 *           (for Memory), or below 64KB (for relocatable I/O)
 * ss:       is the space code, denoting the address space
 * bbbbbbbb: is the 8-bit Bus Number
 * ddddd:    is the 5-bit Device Number
 * fff:      is the 3-bit Function Number
 * rrrrrrrr: is the 8-bit Register Number
 * hhhhhhhh: is a 32-bit unsigned number
 * llllllll: is a 32-bit unsigned number
 */
struct fdt_pci_addr {
	u32	phys_hi;
	u32	phys_mid;
	u32	phys_lo;
};

/**
 * Compute the size of a resource.
 *
 * @param res	the resource to operate on
 * @return the size of the resource
 */
static inline fdt_size_t fdt_resource_size(const struct fdt_resource *res)
{
	return res->end - res->start + 1;
}

/**
 * Compat types that we know about and for which we might have drivers.
 * Each is named COMPAT_<dir>_<filename> where <dir> is the directory
 * within drivers.
 */
enum fdt_compat_id {
	COMPAT_UNKNOWN,
	COMPAT_NVIDIA_TEGRA20_EMC,	/* Tegra20 memory controller */
	COMPAT_NVIDIA_TEGRA20_EMC_TABLE, /* Tegra20 memory timing table */
	COMPAT_NVIDIA_TEGRA20_KBC,	/* Tegra20 Keyboard */
	COMPAT_NVIDIA_TEGRA20_NAND,	/* Tegra2 NAND controller */
	COMPAT_NVIDIA_TEGRA20_PWM,	/* Tegra 2 PWM controller */
	COMPAT_NVIDIA_TEGRA124_DC,	/* Tegra 124 Display controller */
	COMPAT_NVIDIA_TEGRA124_SOR,	/* Tegra 124 Serial Output Resource */
	COMPAT_NVIDIA_TEGRA124_PMC,	/* Tegra 124 power mgmt controller */
	COMPAT_NVIDIA_TEGRA20_DC,	/* Tegra 2 Display controller */
	COMPAT_NVIDIA_TEGRA210_SDMMC,	/* Tegra210 SDMMC controller */
	COMPAT_NVIDIA_TEGRA124_SDMMC,	/* Tegra124 SDMMC controller */
	COMPAT_NVIDIA_TEGRA30_SDMMC,	/* Tegra30 SDMMC controller */
	COMPAT_NVIDIA_TEGRA20_SDMMC,	/* Tegra20 SDMMC controller */
	COMPAT_NVIDIA_TEGRA124_PCIE,	/* Tegra 124 PCIe controller */
	COMPAT_NVIDIA_TEGRA30_PCIE,	/* Tegra 30 PCIe controller */
	COMPAT_NVIDIA_TEGRA20_PCIE,	/* Tegra 20 PCIe controller */
	COMPAT_NVIDIA_TEGRA124_XUSB_PADCTL,
					/* Tegra124 XUSB pad controller */
	COMPAT_NVIDIA_TEGRA210_XUSB_PADCTL,
					/* Tegra210 XUSB pad controller */
	COMPAT_SMSC_LAN9215,		/* SMSC 10/100 Ethernet LAN9215 */
	COMPAT_SAMSUNG_EXYNOS5_SROMC,	/* Exynos5 SROMC */
	COMPAT_SAMSUNG_S3C2440_I2C,	/* Exynos I2C Controller */
	COMPAT_SAMSUNG_EXYNOS5_SOUND,	/* Exynos Sound */
	COMPAT_WOLFSON_WM8994_CODEC,	/* Wolfson WM8994 Sound Codec */
	COMPAT_GOOGLE_CROS_EC_KEYB,	/* Google CROS_EC Keyboard */
	COMPAT_SAMSUNG_EXYNOS_USB_PHY,	/* Exynos phy controller for usb2.0 */
	COMPAT_SAMSUNG_EXYNOS5_USB3_PHY,/* Exynos phy controller for usb3.0 */
	COMPAT_SAMSUNG_EXYNOS_TMU,	/* Exynos TMU */
	COMPAT_SAMSUNG_EXYNOS_FIMD,	/* Exynos Display controller */
	COMPAT_SAMSUNG_EXYNOS_MIPI_DSI,	/* Exynos mipi dsi */
	COMPAT_SAMSUNG_EXYNOS5_DP,	/* Exynos Display port controller */
	COMPAT_SAMSUNG_EXYNOS_DWMMC,	/* Exynos DWMMC controller */
	COMPAT_SAMSUNG_EXYNOS_MMC,	/* Exynos MMC controller */
	COMPAT_SAMSUNG_EXYNOS_SERIAL,	/* Exynos UART */
	COMPAT_MAXIM_MAX77686_PMIC,	/* MAX77686 PMIC */
	COMPAT_GENERIC_SPI_FLASH,	/* Generic SPI Flash chip */
	COMPAT_MAXIM_98095_CODEC,	/* MAX98095 Codec */
	COMPAT_SAMSUNG_EXYNOS5_I2C,	/* Exynos5 High Speed I2C Controller */
	COMPAT_SANDBOX_LCD_SDL,		/* Sandbox LCD emulation with SDL */
	COMPAT_SAMSUNG_EXYNOS_SYSMMU,	/* Exynos sysmmu */
	COMPAT_INTEL_MICROCODE,		/* Intel microcode update */
	COMPAT_MEMORY_SPD,		/* Memory SPD information */
	COMPAT_INTEL_PANTHERPOINT_AHCI,	/* Intel Pantherpoint AHCI */
	COMPAT_INTEL_MODEL_206AX,	/* Intel Model 206AX CPU */
	COMPAT_INTEL_GMA,		/* Intel Graphics Media Accelerator */
	COMPAT_AMS_AS3722,		/* AMS AS3722 PMIC */
	COMPAT_INTEL_ICH_SPI,		/* Intel ICH7/9 SPI controller */
	COMPAT_INTEL_QRK_MRC,		/* Intel Quark MRC */
	COMPAT_INTEL_X86_PINCTRL,	/* Intel ICH7/9 pin control */
	COMPAT_SOCIONEXT_XHCI,		/* Socionext UniPhier xHCI */
	COMPAT_INTEL_PCH,		/* Intel PCH */
	COMPAT_INTEL_IRQ_ROUTER,	/* Intel Interrupt Router */
	COMPAT_ALTERA_SOCFPGA_DWMAC,	/* SoCFPGA Ethernet controller */
	COMPAT_ALTERA_SOCFPGA_DWMMC,	/* SoCFPGA DWMMC controller */
	COMPAT_INTEL_BAYTRAIL_FSP,	/* Intel Bay Trail FSP */
	COMPAT_INTEL_BAYTRAIL_FSP_MDP,	/* Intel FSP memory-down params */

	COMPAT_COUNT,
};

#define MAX_PHANDLE_ARGS 16
struct fdtdec_phandle_args {
	int node;
	int args_count;
	uint32_t args[MAX_PHANDLE_ARGS];
};

/**
 * fdtdec_parse_phandle_with_args() - Find a node pointed by phandle in a list
 *
 * This function is useful to parse lists of phandles and their arguments.
 *
 * Example:
 *
 * phandle1: node1 {
 *	#list-cells = <2>;
 * }
 *
 * phandle2: node2 {
 *	#list-cells = <1>;
 * }
 *
 * node3 {
 *	list = <&phandle1 1 2 &phandle2 3>;
 * }
 *
 * To get a device_node of the `node2' node you may call this:
 * fdtdec_parse_phandle_with_args(blob, node3, "list", "#list-cells", 0, 1,
 *				  &args);
 *
 * (This function is a modified version of __of_parse_phandle_with_args() from
 * Linux 3.18)
 *
 * @blob:	Pointer to device tree
 * @src_node:	Offset of device tree node containing a list
 * @list_name:	property name that contains a list
 * @cells_name:	property name that specifies the phandles' arguments count,
 *		or NULL to use @cells_count
 * @cells_count: Cell count to use if @cells_name is NULL
 * @index:	index of a phandle to parse out
 * @out_args:	optional pointer to output arguments structure (will be filled)
 * @return 0 on success (with @out_args filled out if not NULL), -ENOENT if
 *	@list_name does not exist, a phandle was not found, @cells_name
 *	could not be found, the arguments were truncated or there were too
 *	many arguments.
 *
 */
int fdtdec_parse_phandle_with_args(const void *blob, int src_node,
				   const char *list_name,
				   const char *cells_name,
				   int cell_count, int index,
				   struct fdtdec_phandle_args *out_args);

/**
 * Find the next numbered alias for a peripheral. This is used to enumerate
 * all the peripherals of a certain type.
 *
 * Do the first call with *upto = 0. Assuming /aliases/<name>0 exists then
 * this function will return a pointer to the node the alias points to, and
 * then update *upto to 1. Next time you call this function, the next node
 * will be returned.
 *
 * All nodes returned will match the compatible ID, as it is assumed that
 * all peripherals use the same driver.
 *
 * @param blob		FDT blob to use
 * @param name		Root name of alias to search for
 * @param id		Compatible ID to look for
 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
 */
int fdtdec_next_alias(const void *blob, const char *name,
		enum fdt_compat_id id, int *upto);

/**
 * Find the compatible ID for a given node.
 *
 * Generally each node has at least one compatible string attached to it.
 * This function looks through our list of known compatible strings and
 * returns the corresponding ID which matches the compatible string.
 *
 * @param blob		FDT blob to use
 * @param node		Node containing compatible string to find
 * @return compatible ID, or COMPAT_UNKNOWN if we cannot find a match
 */
enum fdt_compat_id fdtdec_lookup(const void *blob, int node);

/**
 * Find the next compatible node for a peripheral.
 *
 * Do the first call with node = 0. This function will return a pointer to
 * the next compatible node. Next time you call this function, pass the
 * value returned, and the next node will be provided.
 *
 * @param blob		FDT blob to use
 * @param node		Start node for search
 * @param id		Compatible ID to look for (enum fdt_compat_id)
 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
 */
int fdtdec_next_compatible(const void *blob, int node,
		enum fdt_compat_id id);

/**
 * Find the next compatible subnode for a peripheral.
 *
 * Do the first call with node set to the parent and depth = 0. This
 * function will return the offset of the next compatible node. Next time
 * you call this function, pass the node value returned last time, with
 * depth unchanged, and the next node will be provided.
 *
 * @param blob		FDT blob to use
 * @param node		Start node for search
 * @param id		Compatible ID to look for (enum fdt_compat_id)
 * @param depthp	Current depth (set to 0 before first call)
 * @return offset of next compatible node, or -FDT_ERR_NOTFOUND if no more
 */
int fdtdec_next_compatible_subnode(const void *blob, int node,
		enum fdt_compat_id id, int *depthp);

/*
 * Look up an address property in a node and return the parsed address, and
 * optionally the parsed size.
 *
 * This variant assumes a known and fixed number of cells are used to
 * represent the address and size.
 *
 * You probably don't want to use this function directly except to parse
 * non-standard properties, and never to parse the "reg" property. Instead,
 * use one of the "auto" variants below, which automatically honor the
 * #address-cells and #size-cells properties in the parent node.
 *
 * @param blob	FDT blob
 * @param node	node to examine
 * @param prop_name	name of property to find
 * @param index	which address to retrieve from a list of addresses. Often 0.
 * @param na	the number of cells used to represent an address
 * @param ns	the number of cells used to represent a size
 * @param sizep	a pointer to store the size into. Use NULL if not required
 * @return address, if found, or FDT_ADDR_T_NONE if not
 */
fdt_addr_t fdtdec_get_addr_size_fixed(const void *blob, int node,
		const char *prop_name, int index, int na, int ns,
		fdt_size_t *sizep);

/*
 * Look up an address property in a node and return the parsed address, and
 * optionally the parsed size.
 *
 * This variant automatically determines the number of cells used to represent
 * the address and size by parsing the provided parent node's #address-cells
 * and #size-cells properties.
 *
 * @param blob	FDT blob
 * @param parent	parent node of @node
 * @param node	node to examine
 * @param prop_name	name of property to find
 * @param index	which address to retrieve from a list of addresses. Often 0.
 * @param sizep	a pointer to store the size into. Use NULL if not required
 * @return address, if found, or FDT_ADDR_T_NONE if not
 */
fdt_addr_t fdtdec_get_addr_size_auto_parent(const void *blob, int parent,
		int node, const char *prop_name, int index, fdt_size_t *sizep);

/*
 * Look up an address property in a node and return the parsed address, and
 * optionally the parsed size.
 *
 * This variant automatically determines the number of cells used to represent
 * the address and size by parsing the parent node's #address-cells
 * and #size-cells properties. The parent node is automatically found.
 *
 * The automatic parent lookup implemented by this function is slow.
 * Consequently, fdtdec_get_addr_size_auto_parent() should be used where
 * possible.
 *
 * @param blob	FDT blob
 * @param parent	parent node of @node
 * @param node	node to examine
 * @param prop_name	name of property to find
 * @param index	which address to retrieve from a list of addresses. Often 0.
 * @param sizep	a pointer to store the size into. Use NULL if not required
 * @return address, if found, or FDT_ADDR_T_NONE if not
 */
fdt_addr_t fdtdec_get_addr_size_auto_noparent(const void *blob, int node,
		const char *prop_name, int index, fdt_size_t *sizep);

/*
 * Look up an address property in a node and return the parsed address.
 *
 * This variant hard-codes the number of cells used to represent the address
 * and size based on sizeof(fdt_addr_t) and sizeof(fdt_size_t). It also
 * always returns the first address value in the property (index 0).
 *
 * Use of this function is not recommended due to the hard-coding of cell
 * counts. There is no programmatic validation that these hard-coded values
 * actually match the device tree content in any way at all. This assumption
 * can be satisfied by manually ensuring CONFIG_PHYS_64BIT is appropriately
 * set in the U-Boot build and exercising strict control over DT content to
 * ensure use of matching #address-cells/#size-cells properties. However, this
 * approach is error-prone; those familiar with DT will not expect the
 * assumption to exist, and could easily invalidate it. If the assumption is
 * invalidated, this function will not report the issue, and debugging will
 * be required. Instead, use fdtdec_get_addr_size_auto_parent().
 *
 * @param blob	FDT blob
 * @param node	node to examine
 * @param prop_name	name of property to find
 * @return address, if found, or FDT_ADDR_T_NONE if not
 */
fdt_addr_t fdtdec_get_addr(const void *blob, int node,
		const char *prop_name);

/*
 * Look up an address property in a node and return the parsed address, and
 * optionally the parsed size.
 *
 * This variant hard-codes the number of cells used to represent the address
 * and size based on sizeof(fdt_addr_t) and sizeof(fdt_size_t). It also
 * always returns the first address value in the property (index 0).
 *
 * Use of this function is not recommended due to the hard-coding of cell
 * counts. There is no programmatic validation that these hard-coded values
 * actually match the device tree content in any way at all. This assumption
 * can be satisfied by manually ensuring CONFIG_PHYS_64BIT is appropriately
 * set in the U-Boot build and exercising strict control over DT content to
 * ensure use of matching #address-cells/#size-cells properties. However, this
 * approach is error-prone; those familiar with DT will not expect the
 * assumption to exist, and could easily invalidate it. If the assumption is
 * invalidated, this function will not report the issue, and debugging will
 * be required. Instead, use fdtdec_get_addr_size_auto_parent().
 *
 * @param blob	FDT blob
 * @param node	node to examine
 * @param prop_name	name of property to find
 * @param sizep	a pointer to store the size into. Use NULL if not required
 * @return address, if found, or FDT_ADDR_T_NONE if not
 */
fdt_addr_t fdtdec_get_addr_size(const void *blob, int node,
		const char *prop_name, fdt_size_t *sizep);

/**
 * Look at an address property in a node and return the pci address which
 * corresponds to the given type in the form of fdt_pci_addr.
 * The property must hold one fdt_pci_addr with a lengh.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param type		pci address type (FDT_PCI_SPACE_xxx)
 * @param prop_name	name of property to find
 * @param addr		returns pci address in the form of fdt_pci_addr
 * @return 0 if ok, -ENOENT if the property did not exist, -EINVAL if the
 *		format of the property was invalid, -ENXIO if the requested
 *		address type was not found
 */
int fdtdec_get_pci_addr(const void *blob, int node, enum fdt_pci_space type,
		const char *prop_name, struct fdt_pci_addr *addr);

/**
 * Look at the compatible property of a device node that represents a PCI
 * device and extract pci vendor id and device id from it.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param vendor	vendor id of the pci device
 * @param device	device id of the pci device
 * @return 0 if ok, negative on error
 */
int fdtdec_get_pci_vendev(const void *blob, int node,
		u16 *vendor, u16 *device);

/**
 * Look at the pci address of a device node that represents a PCI device
 * and parse the bus, device and function number from it. For some cases
 * like the bus number encoded in reg property is not correct after pci
 * enumeration, this function looks through the node's compatible strings
 * to get these numbers extracted instead.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param addr		pci address in the form of fdt_pci_addr
 * @param bdf		returns bus, device, function triplet
 * @return 0 if ok, negative on error
 */
int fdtdec_get_pci_bdf(const void *blob, int node,
		struct fdt_pci_addr *addr, pci_dev_t *bdf);

/**
 * Look at the pci address of a device node that represents a PCI device
 * and return base address of the pci device's registers.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param addr		pci address in the form of fdt_pci_addr
 * @param bar		returns base address of the pci device's registers
 * @return 0 if ok, negative on error
 */
int fdtdec_get_pci_bar32(const void *blob, int node,
		struct fdt_pci_addr *addr, u32 *bar);

/**
 * Look up a 32-bit integer property in a node and return it. The property
 * must have at least 4 bytes of data. The value of the first cell is
 * returned.
 *
 * @param blob	FDT blob
 * @param node	node to examine
 * @param prop_name	name of property to find
 * @param default_val	default value to return if the property is not found
 * @return integer value, if found, or default_val if not
 */
s32 fdtdec_get_int(const void *blob, int node, const char *prop_name,
		s32 default_val);

/**
 * Get a variable-sized number from a property
 *
 * This reads a number from one or more cells.
 *
 * @param ptr	Pointer to property
 * @param cells	Number of cells containing the number
 * @return the value in the cells
 */
u64 fdtdec_get_number(const fdt32_t *ptr, unsigned int cells);

/**
 * Look up a 64-bit integer property in a node and return it. The property
 * must have at least 8 bytes of data (2 cells). The first two cells are
 * concatenated to form a 8 bytes value, where the first cell is top half and
 * the second cell is bottom half.
 *
 * @param blob	FDT blob
 * @param node	node to examine
 * @param prop_name	name of property to find
 * @param default_val	default value to return if the property is not found
 * @return integer value, if found, or default_val if not
 */
uint64_t fdtdec_get_uint64(const void *blob, int node, const char *prop_name,
		uint64_t default_val);

/**
 * Checks whether a node is enabled.
 * This looks for a 'status' property. If this exists, then returns 1 if
 * the status is 'ok' and 0 otherwise. If there is no status property,
 * it returns 1 on the assumption that anything mentioned should be enabled
 * by default.
 *
 * @param blob	FDT blob
 * @param node	node to examine
 * @return integer value 0 (not enabled) or 1 (enabled)
 */
int fdtdec_get_is_enabled(const void *blob, int node);

/**
 * Make sure we have a valid fdt available to control U-Boot.
 *
 * If not, a message is printed to the console if the console is ready.
 *
 * @return 0 if all ok, -1 if not
 */
int fdtdec_prepare_fdt(void);

/**
 * Checks that we have a valid fdt available to control U-Boot.

 * However, if not then for the moment nothing is done, since this function
 * is called too early to panic().
 *
 * @returns 0
 */
int fdtdec_check_fdt(void);

/**
 * Find the nodes for a peripheral and return a list of them in the correct
 * order. This is used to enumerate all the peripherals of a certain type.
 *
 * To use this, optionally set up a /aliases node with alias properties for
 * a peripheral. For example, for usb you could have:
 *
 * aliases {
 *		usb0 = "/ehci@c5008000";
 *		usb1 = "/ehci@c5000000";
 * };
 *
 * Pass "usb" as the name to this function and will return a list of two
 * nodes offsets: /ehci@c5008000 and ehci@c5000000.
 *
 * All nodes returned will match the compatible ID, as it is assumed that
 * all peripherals use the same driver.
 *
 * If no alias node is found, then the node list will be returned in the
 * order found in the fdt. If the aliases mention a node which doesn't
 * exist, then this will be ignored. If nodes are found with no aliases,
 * they will be added in any order.
 *
 * If there is a gap in the aliases, then this function return a 0 node at
 * that position. The return value will also count these gaps.
 *
 * This function checks node properties and will not return nodes which are
 * marked disabled (status = "disabled").
 *
 * @param blob		FDT blob to use
 * @param name		Root name of alias to search for
 * @param id		Compatible ID to look for
 * @param node_list	Place to put list of found nodes
 * @param maxcount	Maximum number of nodes to find
 * @return number of nodes found on success, FTD_ERR_... on error
 */
int fdtdec_find_aliases_for_id(const void *blob, const char *name,
			enum fdt_compat_id id, int *node_list, int maxcount);

/*
 * This function is similar to fdtdec_find_aliases_for_id() except that it
 * adds to the node_list that is passed in. Any 0 elements are considered
 * available for allocation - others are considered already used and are
 * skipped.
 *
 * You can use this by calling fdtdec_find_aliases_for_id() with an
 * uninitialised array, then setting the elements that are returned to -1,
 * say, then calling this function, perhaps with a different compat id.
 * Any elements you get back that are >0 are new nodes added by the call
 * to this function.
 *
 * Note that if you have some nodes with aliases and some without, you are
 * sailing close to the wind. The call to fdtdec_find_aliases_for_id() with
 * one compat_id may fill in positions for which you have aliases defined
 * for another compat_id. When you later call *this* function with the second
 * compat_id, the alias positions may already be used. A debug warning may
 * be generated in this case, but it is safest to define aliases for all
 * nodes when you care about the ordering.
 */
int fdtdec_add_aliases_for_id(const void *blob, const char *name,
			enum fdt_compat_id id, int *node_list, int maxcount);

/**
 * Get the alias sequence number of a node
 *
 * This works out whether a node is pointed to by an alias, and if so, the
 * sequence number of that alias. Aliases are of the form <base><num> where
 * <num> is the sequence number. For example spi2 would be sequence number
 * 2.
 *
 * @param blob		Device tree blob (if NULL, then error is returned)
 * @param base		Base name for alias (before the underscore)
 * @param node		Node to look up
 * @param seqp		This is set to the sequence number if one is found,
 *			but otherwise the value is left alone
 * @return 0 if a sequence was found, -ve if not
 */
int fdtdec_get_alias_seq(const void *blob, const char *base, int node,
			 int *seqp);

/**
 * Get a property from the /chosen node
 *
 * @param blob		Device tree blob (if NULL, then NULL is returned)
 * @param name		Property name to look up
 * @return Value of property, or NULL if it does not exist
 */
const char *fdtdec_get_chosen_prop(const void *blob, const char *name);

/**
 * Get the offset of the given /chosen node
 *
 * This looks up a property in /chosen containing the path to another node,
 * then finds the offset of that node.
 *
 * @param blob		Device tree blob (if NULL, then error is returned)
 * @param name		Property name, e.g. "stdout-path"
 * @return Node offset referred to by that chosen node, or -ve FDT_ERR_...
 */
int fdtdec_get_chosen_node(const void *blob, const char *name);

/*
 * Get the name for a compatible ID
 *
 * @param id		Compatible ID to look for
 * @return compatible string for that id
 */
const char *fdtdec_get_compatible(enum fdt_compat_id id);

/* Look up a phandle and follow it to its node. Then return the offset
 * of that node.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param prop_name	name of property to find
 * @return node offset if found, -ve error code on error
 */
int fdtdec_lookup_phandle(const void *blob, int node, const char *prop_name);

/**
 * Look up a property in a node and return its contents in an integer
 * array of given length. The property must have at least enough data for
 * the array (4*count bytes). It may have more, but this will be ignored.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param prop_name	name of property to find
 * @param array		array to fill with data
 * @param count		number of array elements
 * @return 0 if ok, or -FDT_ERR_NOTFOUND if the property is not found,
 *		or -FDT_ERR_BADLAYOUT if not enough data
 */
int fdtdec_get_int_array(const void *blob, int node, const char *prop_name,
		u32 *array, int count);

/**
 * Look up a property in a node and return its contents in an integer
 * array of given length. The property must exist but may have less data that
 * expected (4*count bytes). It may have more, but this will be ignored.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param prop_name	name of property to find
 * @param array		array to fill with data
 * @param count		number of array elements
 * @return number of array elements if ok, or -FDT_ERR_NOTFOUND if the
 *		property is not found
 */
int fdtdec_get_int_array_count(const void *blob, int node,
			       const char *prop_name, u32 *array, int count);

/**
 * Look up a property in a node and return a pointer to its contents as a
 * unsigned int array of given length. The property must have at least enough
 * data for the array ('count' cells). It may have more, but this will be
 * ignored. The data is not copied.
 *
 * Note that you must access elements of the array with fdt32_to_cpu(),
 * since the elements will be big endian even on a little endian machine.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param prop_name	name of property to find
 * @param count		number of array elements
 * @return pointer to array if found, or NULL if the property is not
 *		found or there is not enough data
 */
const u32 *fdtdec_locate_array(const void *blob, int node,
			       const char *prop_name, int count);

/**
 * Look up a boolean property in a node and return it.
 *
 * A boolean properly is true if present in the device tree and false if not
 * present, regardless of its value.
 *
 * @param blob	FDT blob
 * @param node	node to examine
 * @param prop_name	name of property to find
 * @return 1 if the properly is present; 0 if it isn't present
 */
int fdtdec_get_bool(const void *blob, int node, const char *prop_name);

/**
 * Look in the FDT for a config item with the given name and return its value
 * as a 32-bit integer. The property must have at least 4 bytes of data. The
 * value of the first cell is returned.
 *
 * @param blob		FDT blob to use
 * @param prop_name	Node property name
 * @param default_val	default value to return if the property is not found
 * @return integer value, if found, or default_val if not
 */
int fdtdec_get_config_int(const void *blob, const char *prop_name,
		int default_val);

/**
 * Look in the FDT for a config item with the given name
 * and return whether it exists.
 *
 * @param blob		FDT blob
 * @param prop_name	property name to look up
 * @return 1, if it exists, or 0 if not
 */
int fdtdec_get_config_bool(const void *blob, const char *prop_name);

/**
 * Look in the FDT for a config item with the given name and return its value
 * as a string.
 *
 * @param blob          FDT blob
 * @param prop_name     property name to look up
 * @returns property string, NULL on error.
 */
char *fdtdec_get_config_string(const void *blob, const char *prop_name);

/*
 * Look up a property in a node and return its contents in a byte
 * array of given length. The property must have at least enough data for
 * the array (count bytes). It may have more, but this will be ignored.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param prop_name	name of property to find
 * @param array		array to fill with data
 * @param count		number of array elements
 * @return 0 if ok, or -FDT_ERR_MISSING if the property is not found,
 *		or -FDT_ERR_BADLAYOUT if not enough data
 */
int fdtdec_get_byte_array(const void *blob, int node, const char *prop_name,
		u8 *array, int count);

/**
 * Look up a property in a node and return a pointer to its contents as a
 * byte array of given length. The property must have at least enough data
 * for the array (count bytes). It may have more, but this will be ignored.
 * The data is not copied.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param prop_name	name of property to find
 * @param count		number of array elements
 * @return pointer to byte array if found, or NULL if the property is not
 *		found or there is not enough data
 */
const u8 *fdtdec_locate_byte_array(const void *blob, int node,
			     const char *prop_name, int count);

/**
 * Look up a property in a node which contains a memory region address and
 * size. Then return a pointer to this address.
 *
 * The property must hold one address with a length. This is only tested on
 * 32-bit machines.
 *
 * @param blob		FDT blob
 * @param node		node to examine
 * @param prop_name	name of property to find
 * @param basep		Returns base address of region
 * @param size		Returns size of region
 * @return 0 if ok, -1 on error (property not found)
 */
int fdtdec_decode_region(const void *blob, int node, const char *prop_name,
			 fdt_addr_t *basep, fdt_size_t *sizep);

enum fmap_compress_t {
	FMAP_COMPRESS_NONE,
	FMAP_COMPRESS_LZO,
};

enum fmap_hash_t {
	FMAP_HASH_NONE,
	FMAP_HASH_SHA1,
	FMAP_HASH_SHA256,
};

/* A flash map entry, containing an offset and length */
struct fmap_entry {
	uint32_t offset;
	uint32_t length;
	uint32_t used;			/* Number of bytes used in region */
	enum fmap_compress_t compress_algo;	/* Compression type */
	enum fmap_hash_t hash_algo;		/* Hash algorithm */
	const uint8_t *hash;			/* Hash value */
	int hash_size;				/* Hash size */
};

/**
 * Read a flash entry from the fdt
 *
 * @param blob		FDT blob
 * @param node		Offset of node to read
 * @param name		Name of node being read
 * @param entry		Place to put offset and size of this node
 * @return 0 if ok, -ve on error
 */
int fdtdec_read_fmap_entry(const void *blob, int node, const char *name,
			   struct fmap_entry *entry);

/**
 * Obtain an indexed resource from a device property.
 *
 * @param fdt		FDT blob
 * @param node		node to examine
 * @param property	name of the property to parse
 * @param index		index of the resource to retrieve
 * @param res		returns the resource
 * @return 0 if ok, negative on error
 */
int fdt_get_resource(const void *fdt, int node, const char *property,
		     unsigned int index, struct fdt_resource *res);

/**
 * Obtain a named resource from a device property.
 *
 * Look up the index of the name in a list of strings and return the resource
 * at that index.
 *
 * @param fdt		FDT blob
 * @param node		node to examine
 * @param property	name of the property to parse
 * @param prop_names	name of the property containing the list of names
 * @param name		the name of the entry to look up
 * @param res		returns the resource
 */
int fdt_get_named_resource(const void *fdt, int node, const char *property,
			   const char *prop_names, const char *name,
			   struct fdt_resource *res);

/**
 * Decode a named region within a memory bank of a given type.
 *
 * This function handles selection of a memory region. The region is
 * specified as an offset/size within a particular type of memory.
 *
 * The properties used are:
 *
 *	<mem_type>-memory<suffix> for the name of the memory bank
 *	<mem_type>-offset<suffix> for the offset in that bank
 *
 * The property value must have an offset and a size. The function checks
 * that the region is entirely within the memory bank.5
 *
 * @param blob		FDT blob
 * @param node		Node containing the properties (-1 for /config)
 * @param mem_type	Type of memory to use, which is a name, such as
 *			"u-boot" or "kernel".
 * @param suffix	String to append to the memory/offset
 *			property names
 * @param basep		Returns base of region
 * @param sizep		Returns size of region
 * @return 0 if OK, -ive on error
 */
int fdtdec_decode_memory_region(const void *blob, int node,
				const char *mem_type, const char *suffix,
				fdt_addr_t *basep, fdt_size_t *sizep);

/* Display timings from linux include/video/display_timing.h */
enum display_flags {
	DISPLAY_FLAGS_HSYNC_LOW		= 1 << 0,
	DISPLAY_FLAGS_HSYNC_HIGH	= 1 << 1,
	DISPLAY_FLAGS_VSYNC_LOW		= 1 << 2,
	DISPLAY_FLAGS_VSYNC_HIGH	= 1 << 3,

	/* data enable flag */
	DISPLAY_FLAGS_DE_LOW		= 1 << 4,
	DISPLAY_FLAGS_DE_HIGH		= 1 << 5,
	/* drive data on pos. edge */
	DISPLAY_FLAGS_PIXDATA_POSEDGE	= 1 << 6,
	/* drive data on neg. edge */
	DISPLAY_FLAGS_PIXDATA_NEGEDGE	= 1 << 7,
	DISPLAY_FLAGS_INTERLACED	= 1 << 8,
	DISPLAY_FLAGS_DOUBLESCAN	= 1 << 9,
	DISPLAY_FLAGS_DOUBLECLK		= 1 << 10,
};

/*
 * A single signal can be specified via a range of minimal and maximal values
 * with a typical value, that lies somewhere inbetween.
 */
struct timing_entry {
	u32 min;
	u32 typ;
	u32 max;
};

/*
 * Single "mode" entry. This describes one set of signal timings a display can
 * have in one setting. This struct can later be converted to struct videomode
 * (see include/video/videomode.h). As each timing_entry can be defined as a
 * range, one struct display_timing may become multiple struct videomodes.
 *
 * Example: hsync active high, vsync active low
 *
 *				    Active Video
 * Video  ______________________XXXXXXXXXXXXXXXXXXXXXX_____________________
 *	  |<- sync ->|<- back ->|<----- active ----->|<- front ->|<- sync..
 *	  |	     |	 porch  |		     |	 porch	 |
 *
 * HSync _|¯¯¯¯¯¯¯¯¯¯|___________________________________________|¯¯¯¯¯¯¯¯¯
 *
 * VSync ¯|__________|¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯|_________
 */
struct display_timing {
	struct timing_entry pixelclock;

	struct timing_entry hactive;		/* hor. active video */
	struct timing_entry hfront_porch;	/* hor. front porch */
	struct timing_entry hback_porch;	/* hor. back porch */
	struct timing_entry hsync_len;		/* hor. sync len */

	struct timing_entry vactive;		/* ver. active video */
	struct timing_entry vfront_porch;	/* ver. front porch */
	struct timing_entry vback_porch;	/* ver. back porch */
	struct timing_entry vsync_len;		/* ver. sync len */

	enum display_flags flags;		/* display flags */
};

/**
 * fdtdec_decode_display_timing() - decode display timings
 *
 * Decode display timings from the supplied 'display-timings' node.
 * See doc/device-tree-bindings/video/display-timing.txt for binding
 * information.
 *
 * @param blob		FDT blob
 * @param node		'display-timing' node containing the timing subnodes
 * @param index		Index number to read (0=first timing subnode)
 * @param config	Place to put timings
 * @return 0 if OK, -FDT_ERR_NOTFOUND if not found
 */
int fdtdec_decode_display_timing(const void *blob, int node, int index,
				 struct display_timing *config);
/**
 * Set up the device tree ready for use
 */
int fdtdec_setup(void);

#endif