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
|
/** @file
Flattened device tree utility.
Copyright (c) 2021, ARM Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@par Reference(s):
- Device tree Specification - Release v0.3
- linux/Documentation/devicetree/bindings/interrupt-controller/arm%2Cgic.yaml
- linux//Documentation/devicetree/bindings/interrupt-controller/arm%2Cgic.yaml
**/
#ifndef FDT_UTILITY_H_
#define FDT_UTILITY_H_
/** Get the offset of an address in a "reg" Device Tree property.
In a Device Tree, the "reg" property stores address/size couples.
They are stored on N 32-bits cells.
Based on the value of the #address-cells, the #size-cells and the
index in the "reg" property, compute the number of 32-bits cells
to skip.
@param [in] Index Index in the reg property.
@param [in] AddrCells Number of cells used to store an address.
@param [in] SizeCells Number of cells used to store the size of
an address.
@retval Number of 32-bits cells to skip to access the address.
*/
#define GET_DT_REG_ADDRESS_OFFSET(Index, AddrCells, SizeCells) ( \
(Index) * ((AddrCells) + (SizeCells)) \
)
/** Get the offset of an address size in a "reg" Device Tree property.
In a Device Tree, the "reg" property stores address/size couples.
They are stored on N 32-bits cells.
Based on the value of the #address-cells, the #size-cells and the
index in the "reg" property, compute the number of 32-bits cells
to skip.
@param [in] Index Index in the reg property.
@param [in] AddrCells Number of cells used to store an address.
@param [in] SizeCells Number of cells used to store the size of
an address.
@retval Number of 32-bits cells to skip to access the address size.
*/
#define GET_DT_REG_SIZE_OFFSET(Index, AddrCells, SizeCells) ( \
GET_DT_REG_ADDRESS_OFFSET ((Index), (AddrCells), (SizeCells)) + \
(SizeCells) \
)
/// Maximum string length for compatible names.
#define COMPATIBLE_STR_LEN (32U)
/// Interrupt macros
#define PPI_OFFSET (16U)
#define SPI_OFFSET (32U)
#define DT_PPI_IRQ (1U)
#define DT_SPI_IRQ (0U)
#define DT_IRQ_IS_EDGE_TRIGGERED(x) ((((x) & (BIT0 | BIT1)) != 0))
#define DT_IRQ_IS_ACTIVE_LOW(x) ((((x) & (BIT1 | BIT3)) != 0))
#define IRQ_TYPE_OFFSET (0U)
#define IRQ_NUMBER_OFFSET (1U)
#define IRQ_FLAGS_OFFSET (2U)
/** Get the interrupt Id of an interrupt described in a fdt.
Data must describe a GIC interrupt. A GIC interrupt is on at least
3 UINT32 cells.
This function DOES NOT SUPPORT extended SPI range and extended PPI range.
@param [in] Data Pointer to the first cell of an "interrupts" property.
@retval The interrupt id.
**/
UINT32
EFIAPI
FdtGetInterruptId (
UINT32 CONST *Data
);
/** Get the ACPI interrupt flags of an interrupt described in a fdt.
Data must describe a GIC interrupt. A GIC interrupt is on at least
3 UINT32 cells.
@param [in] Data Pointer to the first cell of an "interrupts" property.
@retval The interrupt flags (for ACPI).
**/
UINT32
EFIAPI
FdtGetInterruptFlags (
UINT32 CONST *Data
);
/** A structure describing a compatibility string.
*/
typedef struct CompatStr {
CONST CHAR8 CompatStr[COMPATIBLE_STR_LEN];
} COMPATIBILITY_STR;
/** Structure containing a list of compatible names and their count.
*/
typedef struct CompatibilityInfo {
/// Count of entries in the NAME_TABLE.
UINT32 Count;
/// Pointer to a table storing the names.
CONST COMPATIBILITY_STR *CompatTable;
} COMPATIBILITY_INFO;
/** Operate a check on a Device Tree node.
@param [in] Fdt Pointer to a Flattened Device Tree.
@param [in] NodeOffset Offset of the node to compare input string.
@param [in] Context Context to operate the check on the node.
@retval True The check is correct.
@retval FALSE Otherwise, or error.
**/
typedef
BOOLEAN
(EFIAPI *NODE_CHECKER_FUNC)(
IN CONST VOID *Fdt,
IN INT32 NodeOffset,
IN CONST VOID *Context
);
/** Iterate through the list of strings in the Context,
and check whether at least one string is matching the
"compatible" property of the node.
@param [in] Fdt Pointer to a Flattened Device Tree.
@param [in] Node Offset of the node to operate the check on.
@param [in] CompatInfo COMPATIBILITY_INFO containing the list of compatible
strings to compare with the "compatible" property
of the node.
@retval TRUE At least one string matched, the node is compatible.
@retval FALSE Otherwise, or error.
**/
BOOLEAN
EFIAPI
FdtNodeIsCompatible (
IN CONST VOID *Fdt,
IN INT32 Node,
IN CONST VOID *CompatInfo
);
/** Check whether a node has a property.
@param [in] Fdt Pointer to a Flattened Device Tree.
@param [in] Node Offset of the node to operate the check on.
@param [in] PropertyName Name of the property to search.
This is a NULL terminated string.
@retval True The node has the property.
@retval FALSE Otherwise, or error.
**/
BOOLEAN
EFIAPI
FdtNodeHasProperty (
IN CONST VOID *Fdt,
IN INT32 Node,
IN CONST VOID *PropertyName
);
/** Get the next node in a branch having a matching name.
The Device tree is traversed in a depth-first search, starting from Node.
The input Node is skipped.
@param [in] Fdt Pointer to a Flattened Device Tree.
@param [in] FdtBranch Only search in the sub-nodes of this branch.
Write (-1) to search the whole tree.
@param [in] NodeName The node name to search.
This is a NULL terminated string.
@param [in, out] Node At entry: Node offset to start the search.
This first node is skipped.
Write (-1) to search the whole tree.
At exit: If success, contains the offset of
the next node in the branch
having a matching name.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED An error occurred.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_NOT_FOUND No matching node found.
**/
EFI_STATUS
EFIAPI
FdtGetNextNamedNodeInBranch (
IN CONST VOID *Fdt,
IN INT32 FdtBranch,
IN CONST CHAR8 *NodeName,
IN OUT INT32 *Node
);
/** Get the next node in a branch with at least one compatible property.
The Device tree is traversed in a depth-first search, starting from Node.
The input Node is skipped.
@param [in] Fdt Pointer to a Flattened Device Tree.
@param [in] FdtBranch Only search in the sub-nodes of this branch.
Write (-1) to search the whole tree.
@param [in] CompatNamesInfo Table of compatible strings to compare with
the compatible property of the node.
@param [in, out] Node At entry: Node offset to start the search.
This first node is skipped.
Write (-1) to search the whole tree.
At exit: If success, contains the offset of
the next node in the branch
being compatible.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED An error occurred.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_NOT_FOUND No matching node found.
**/
EFI_STATUS
EFIAPI
FdtGetNextCompatNodeInBranch (
IN CONST VOID *Fdt,
IN INT32 FdtBranch,
IN CONST COMPATIBILITY_INFO *CompatNamesInfo,
IN OUT INT32 *Node
);
/** Get the next node in a branch having the PropName property.
The Device tree is traversed in a depth-first search, starting from Node.
The input Node is skipped.
@param [in] Fdt Pointer to a Flattened Device Tree.
@param [in] FdtBranch Only search in the sub-nodes of this branch.
Write (-1) to search the whole tree.
@param [in] PropName Name of the property to search.
This is a NULL terminated string.
@param [in, out] Node At entry: Node offset to start the search.
This first node is skipped.
Write (-1) to search the whole tree.
At exit: If success, contains the offset of
the next node in the branch
being compatible.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED An error occurred.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_NOT_FOUND No matching node found.
**/
EFI_STATUS
EFIAPI
FdtGetNextPropNodeInBranch (
IN CONST VOID *Fdt,
IN INT32 FdtBranch,
IN CONST CHAR8 *PropName,
IN OUT INT32 *Node
);
/** Count the number of nodes in a branch with the input name.
@param [in] Fdt Pointer to a Flattened Device Tree.
@param [in] FdtBranch Only search in the sub-nodes of this branch.
Write (-1) to search the whole tree.
@param [in] NodeName Node name to search.
This is a NULL terminated string.
@param [out] NodeCount If success, contains the count of nodes
fulfilling the condition.
Can be 0.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED An error occurred.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
EFI_STATUS
EFIAPI
FdtCountNamedNodeInBranch (
IN CONST VOID *Fdt,
IN INT32 FdtBranch,
IN CONST CHAR8 *NodeName,
OUT UINT32 *NodeCount
);
/** Count the number of nodes in a branch with at least
one compatible property.
@param [in] Fdt Pointer to a Flattened Device Tree.
@param [in] FdtBranch Only search in the sub-nodes of this branch.
Write (-1) to search the whole tree.
@param [in] CompatibleTable Table of compatible strings to
compare with the compatible property
of the node.
@param [out] NodeCount If success, contains the count of nodes
fulfilling the condition.
Can be 0.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED An error occurred.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
EFI_STATUS
EFIAPI
FdtCountCompatNodeInBranch (
IN CONST VOID *Fdt,
IN INT32 FdtBranch,
IN CONST COMPATIBILITY_INFO *CompatNamesInfo,
OUT UINT32 *NodeCount
);
/** Count the number of nodes in a branch having the PropName property.
@param [in] Fdt Pointer to a Flattened Device Tree.
@param [in] FdtBranch Only search in the sub-nodes of this branch.
Write (-1) to search the whole tree.
@param [in] PropName Name of the property to search.
This is a NULL terminated string.
@param [out] NodeCount If success, contains the count of nodes
fulfilling the condition.
Can be 0.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED An error occurred.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
EFI_STATUS
EFIAPI
FdtCountPropNodeInBranch (
IN CONST VOID *Fdt,
IN INT32 FdtBranch,
IN CONST CHAR8 *PropName,
OUT UINT32 *NodeCount
);
/** Get the interrupt-controller node handling the interrupts of
the input node.
To do this, recursively search a node with either the "interrupt-controller"
or the "interrupt-parent" property in the parents of Node.
Devicetree Specification, Release v0.3,
2.4.1 "Properties for Interrupt Generating Devices":
Because the hierarchy of the nodes in the interrupt tree
might not match the devicetree, the interrupt-parent
property is available to make the definition of an
interrupt parent explicit. The value is the phandle to the
interrupt parent. If this property is missing from a
device, its interrupt parent is assumed to be its devicetree
parent.
@param [in] Fdt Pointer to a Flattened Device Tree.
@param [in] Node Offset of the node to start the search.
@param [out] IntcNode If success, contains the offset of the
interrupt-controller node.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_NOT_FOUND No interrupt-controller node found.
@retval EFI_ABORTED An error occurred.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
EFI_STATUS
EFIAPI
FdtGetIntcParentNode (
IN CONST VOID *Fdt,
IN INT32 Node,
OUT INT32 *IntcNode
);
/** Get the "interrupt-cells" property value of the node.
The "interrupts" property requires to know the number of cells used
to encode an interrupt. This information is stored in the
interrupt-controller of the input Node.
@param [in] Fdt Pointer to a Flattened Device Tree (Fdt).
@param [in] IntcNode Offset of an interrupt-controller node.
@param [out] IntCells If success, contains the "interrupt-cells"
property of the IntcNode.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_UNSUPPORTED Unsupported.
**/
EFI_STATUS
EFIAPI
FdtGetInterruptCellsInfo (
IN CONST VOID *Fdt,
IN INT32 IntcNode,
OUT INT32 *InterruptCells
);
/** Get the "#address-cells" and/or "#size-cells" property of the node.
According to the Device Tree specification, s2.3.5 "#address-cells and
#size-cells":
"If missing, a client program should assume a default value of 2 for
#address-cells, and a value of 1 for #size-cells."
@param [in] Fdt Pointer to a Flattened Device Tree.
@param [in] Node Offset of the node having to get the
"#address-cells" and "#size-cells"
properties from.
@param [out] AddressCells If success, number of address-cells.
If the property is not available,
default value is 2.
@param [out] SizeCells If success, number of size-cells.
If the property is not available,
default value is 1.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED An error occurred.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
EFI_STATUS
EFIAPI
FdtGetAddressInfo (
IN CONST VOID *Fdt,
IN INT32 Node,
OUT INT32 *AddressCells, OPTIONAL
OUT INT32 *SizeCells OPTIONAL
);
/** Get the "#address-cells" and/or "#size-cells" property of the parent node.
According to the Device Tree specification, s2.3.5 "#address-cells and
#size-cells":
"If missing, a client program should assume a default value of 2 for
#address-cells, and a value of 1 for #size-cells."
@param [in] Fdt Pointer to a Flattened Device Tree.
@param [in] Node Offset of the node having to get the
"#address-cells" and "#size-cells"
properties from its parent.
@param [out] AddressCells If success, number of address-cells.
If the property is not available,
default value is 2.
@param [out] SizeCells If success, number of size-cells.
If the property is not available,
default value is 1.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED An error occurred.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
EFI_STATUS
EFIAPI
FdtGetParentAddressInfo (
IN CONST VOID *Fdt,
IN INT32 Node,
OUT INT32 *AddressCells, OPTIONAL
OUT INT32 *SizeCells OPTIONAL
);
#endif // FDT_UTILITY_H_
|
