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30740795 AB |
1 | /** @file\r |
2 | * FDT client driver\r | |
3 | *\r | |
4 | * Copyright (c) 2016, Linaro Ltd. All rights reserved.<BR>\r | |
5 | *\r | |
6 | * This program and the accompanying materials are\r | |
7 | * licensed and made available under the terms and conditions of the BSD License\r | |
8 | * which accompanies this distribution. The full text of the license may be found at\r | |
9 | * http://opensource.org/licenses/bsd-license.php\r | |
10 | *\r | |
11 | * THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
12 | * WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
13 | *\r | |
14 | **/\r | |
15 | \r | |
16 | #include <Library/BaseLib.h>\r | |
17 | #include <Library/DebugLib.h>\r | |
18 | #include <Library/UefiDriverEntryPoint.h>\r | |
19 | #include <Library/UefiBootServicesTableLib.h>\r | |
20 | #include <Library/HobLib.h>\r | |
21 | #include <libfdt.h>\r | |
22 | \r | |
1e7143d8 | 23 | #include <Guid/Fdt.h>\r |
30740795 AB |
24 | #include <Guid/FdtHob.h>\r |
25 | \r | |
26 | #include <Protocol/FdtClient.h>\r | |
27 | \r | |
28 | STATIC VOID *mDeviceTreeBase;\r | |
29 | \r | |
30 | STATIC\r | |
31 | EFI_STATUS\r | |
32 | GetNodeProperty (\r | |
33 | IN FDT_CLIENT_PROTOCOL *This,\r | |
34 | IN INT32 Node,\r | |
35 | IN CONST CHAR8 *PropertyName,\r | |
36 | OUT CONST VOID **Prop,\r | |
37 | OUT UINT32 *PropSize OPTIONAL\r | |
38 | )\r | |
39 | {\r | |
40 | INT32 Len;\r | |
41 | \r | |
42 | ASSERT (mDeviceTreeBase != NULL);\r | |
43 | ASSERT (Prop != NULL);\r | |
44 | \r | |
45 | *Prop = fdt_getprop (mDeviceTreeBase, Node, PropertyName, &Len);\r | |
46 | if (*Prop == NULL) {\r | |
47 | return EFI_NOT_FOUND;\r | |
48 | }\r | |
49 | \r | |
50 | if (PropSize != NULL) {\r | |
51 | *PropSize = Len;\r | |
52 | }\r | |
53 | return EFI_SUCCESS;\r | |
54 | }\r | |
55 | \r | |
56 | STATIC\r | |
57 | EFI_STATUS\r | |
58 | SetNodeProperty (\r | |
59 | IN FDT_CLIENT_PROTOCOL *This,\r | |
60 | IN INT32 Node,\r | |
61 | IN CONST CHAR8 *PropertyName,\r | |
62 | IN CONST VOID *Prop,\r | |
63 | IN UINT32 PropSize\r | |
64 | )\r | |
65 | {\r | |
66 | INT32 Ret;\r | |
67 | \r | |
68 | ASSERT (mDeviceTreeBase != NULL);\r | |
69 | \r | |
70 | Ret = fdt_setprop (mDeviceTreeBase, Node, PropertyName, Prop, PropSize);\r | |
71 | if (Ret != 0) {\r | |
72 | return EFI_DEVICE_ERROR;\r | |
73 | }\r | |
74 | \r | |
75 | return EFI_SUCCESS;\r | |
76 | }\r | |
77 | \r | |
78 | STATIC\r | |
79 | EFI_STATUS\r | |
80 | EFIAPI\r | |
81 | FindNextCompatibleNode (\r | |
82 | IN FDT_CLIENT_PROTOCOL *This,\r | |
83 | IN CONST CHAR8 *CompatibleString,\r | |
84 | IN INT32 PrevNode,\r | |
85 | OUT INT32 *Node\r | |
86 | )\r | |
87 | {\r | |
88 | INT32 Prev, Next;\r | |
89 | CONST CHAR8 *Type, *Compatible;\r | |
90 | INT32 Len;\r | |
91 | \r | |
92 | ASSERT (mDeviceTreeBase != NULL);\r | |
93 | ASSERT (Node != NULL);\r | |
94 | \r | |
95 | for (Prev = PrevNode;; Prev = Next) {\r | |
96 | Next = fdt_next_node (mDeviceTreeBase, Prev, NULL);\r | |
97 | if (Next < 0) {\r | |
98 | break;\r | |
99 | }\r | |
100 | \r | |
101 | Type = fdt_getprop (mDeviceTreeBase, Next, "compatible", &Len);\r | |
102 | if (Type == NULL) {\r | |
103 | continue;\r | |
104 | }\r | |
105 | \r | |
106 | //\r | |
107 | // A 'compatible' node may contain a sequence of NUL terminated\r | |
108 | // compatible strings so check each one\r | |
109 | //\r | |
110 | for (Compatible = Type; Compatible < Type + Len && *Compatible;\r | |
111 | Compatible += 1 + AsciiStrLen (Compatible)) {\r | |
112 | if (AsciiStrCmp (CompatibleString, Compatible) == 0) {\r | |
113 | *Node = Next;\r | |
114 | return EFI_SUCCESS;\r | |
115 | }\r | |
116 | }\r | |
117 | }\r | |
118 | return EFI_NOT_FOUND;\r | |
119 | }\r | |
120 | \r | |
121 | STATIC\r | |
122 | EFI_STATUS\r | |
123 | EFIAPI\r | |
124 | FindCompatibleNode (\r | |
125 | IN FDT_CLIENT_PROTOCOL *This,\r | |
126 | IN CONST CHAR8 *CompatibleString,\r | |
127 | OUT INT32 *Node\r | |
128 | )\r | |
129 | {\r | |
130 | return FindNextCompatibleNode (This, CompatibleString, 0, Node);\r | |
131 | }\r | |
132 | \r | |
133 | STATIC\r | |
134 | EFI_STATUS\r | |
135 | EFIAPI\r | |
136 | FindCompatibleNodeProperty (\r | |
137 | IN FDT_CLIENT_PROTOCOL *This,\r | |
138 | IN CONST CHAR8 *CompatibleString,\r | |
139 | IN CONST CHAR8 *PropertyName,\r | |
140 | OUT CONST VOID **Prop,\r | |
141 | OUT UINT32 *PropSize OPTIONAL\r | |
142 | )\r | |
143 | {\r | |
144 | EFI_STATUS Status;\r | |
145 | INT32 Node;\r | |
146 | \r | |
147 | Status = FindCompatibleNode (This, CompatibleString, &Node);\r | |
148 | if (EFI_ERROR (Status)) {\r | |
149 | return Status;\r | |
150 | }\r | |
151 | \r | |
152 | return GetNodeProperty (This, Node, PropertyName, Prop, PropSize);\r | |
153 | }\r | |
154 | \r | |
155 | STATIC\r | |
156 | EFI_STATUS\r | |
157 | EFIAPI\r | |
158 | FindCompatibleNodeReg (\r | |
159 | IN FDT_CLIENT_PROTOCOL *This,\r | |
160 | IN CONST CHAR8 *CompatibleString,\r | |
161 | OUT CONST VOID **Reg,\r | |
cfc8d51c AB |
162 | OUT UINTN *AddressCells,\r |
163 | OUT UINTN *SizeCells,\r | |
30740795 AB |
164 | OUT UINT32 *RegSize\r |
165 | )\r | |
166 | {\r | |
167 | EFI_STATUS Status;\r | |
168 | \r | |
169 | ASSERT (RegSize != NULL);\r | |
170 | \r | |
171 | //\r | |
172 | // Get the 'reg' property of this node. For now, we will assume\r | |
173 | // 8 byte quantities for base and size, respectively.\r | |
174 | // TODO use #cells root properties instead\r | |
175 | //\r | |
176 | Status = FindCompatibleNodeProperty (This, CompatibleString, "reg", Reg,\r | |
177 | RegSize);\r | |
178 | if (EFI_ERROR (Status)) {\r | |
179 | return Status;\r | |
180 | }\r | |
181 | \r | |
38ed4a9e | 182 | if ((*RegSize % 16) != 0) {\r |
30740795 AB |
183 | DEBUG ((EFI_D_ERROR,\r |
184 | "%a: '%a' compatible node has invalid 'reg' property (size == 0x%x)\n",\r | |
185 | __FUNCTION__, CompatibleString, *RegSize));\r | |
186 | return EFI_NOT_FOUND;\r | |
187 | }\r | |
188 | \r | |
cfc8d51c AB |
189 | *AddressCells = 2;\r |
190 | *SizeCells = 2;\r | |
30740795 AB |
191 | \r |
192 | return EFI_SUCCESS;\r | |
193 | }\r | |
194 | \r | |
969d2eb3 AB |
195 | STATIC\r |
196 | EFI_STATUS\r | |
197 | EFIAPI\r | |
198 | FindNextMemoryNodeReg (\r | |
199 | IN FDT_CLIENT_PROTOCOL *This,\r | |
200 | IN INT32 PrevNode,\r | |
201 | OUT INT32 *Node,\r | |
202 | OUT CONST VOID **Reg,\r | |
203 | OUT UINTN *AddressCells,\r | |
204 | OUT UINTN *SizeCells,\r | |
205 | OUT UINT32 *RegSize\r | |
206 | )\r | |
207 | {\r | |
208 | INT32 Prev, Next;\r | |
209 | CONST CHAR8 *DeviceType;\r | |
210 | INT32 Len;\r | |
211 | EFI_STATUS Status;\r | |
212 | \r | |
213 | ASSERT (mDeviceTreeBase != NULL);\r | |
214 | ASSERT (Node != NULL);\r | |
215 | \r | |
216 | for (Prev = PrevNode;; Prev = Next) {\r | |
217 | Next = fdt_next_node (mDeviceTreeBase, Prev, NULL);\r | |
218 | if (Next < 0) {\r | |
219 | break;\r | |
220 | }\r | |
221 | \r | |
222 | DeviceType = fdt_getprop (mDeviceTreeBase, Next, "device_type", &Len);\r | |
223 | if (DeviceType != NULL && AsciiStrCmp (DeviceType, "memory") == 0) {\r | |
224 | //\r | |
225 | // Get the 'reg' property of this memory node. For now, we will assume\r | |
226 | // 8 byte quantities for base and size, respectively.\r | |
227 | // TODO use #cells root properties instead\r | |
228 | //\r | |
229 | Status = GetNodeProperty (This, Next, "reg", Reg, RegSize);\r | |
230 | if (EFI_ERROR (Status)) {\r | |
231 | DEBUG ((EFI_D_WARN,\r | |
232 | "%a: ignoring memory node with no 'reg' property\n",\r | |
233 | __FUNCTION__));\r | |
234 | continue;\r | |
235 | }\r | |
236 | if ((*RegSize % 16) != 0) {\r | |
237 | DEBUG ((EFI_D_WARN,\r | |
238 | "%a: ignoring memory node with invalid 'reg' property (size == 0x%x)\n",\r | |
239 | __FUNCTION__, *RegSize));\r | |
240 | continue;\r | |
241 | }\r | |
242 | \r | |
243 | *Node = Next;\r | |
244 | *AddressCells = 2;\r | |
245 | *SizeCells = 2;\r | |
246 | return EFI_SUCCESS;\r | |
247 | }\r | |
248 | }\r | |
249 | return EFI_NOT_FOUND;\r | |
250 | }\r | |
251 | \r | |
252 | STATIC\r | |
253 | EFI_STATUS\r | |
254 | EFIAPI\r | |
255 | FindMemoryNodeReg (\r | |
256 | IN FDT_CLIENT_PROTOCOL *This,\r | |
257 | OUT INT32 *Node,\r | |
258 | OUT CONST VOID **Reg,\r | |
259 | OUT UINTN *AddressCells,\r | |
260 | OUT UINTN *SizeCells,\r | |
261 | OUT UINT32 *RegSize\r | |
262 | )\r | |
263 | {\r | |
264 | return FindNextMemoryNodeReg (This, 0, Node, Reg, AddressCells, SizeCells,\r | |
265 | RegSize);\r | |
266 | }\r | |
267 | \r | |
30740795 AB |
268 | STATIC\r |
269 | EFI_STATUS\r | |
270 | GetOrInsertChosenNode (\r | |
271 | IN FDT_CLIENT_PROTOCOL *This,\r | |
272 | OUT INT32 *Node\r | |
273 | )\r | |
274 | {\r | |
275 | INT32 NewNode;\r | |
276 | \r | |
277 | ASSERT (mDeviceTreeBase != NULL);\r | |
278 | ASSERT (Node != NULL);\r | |
279 | \r | |
280 | NewNode = fdt_path_offset (mDeviceTreeBase, "/chosen");\r | |
281 | if (NewNode < 0) {\r | |
282 | NewNode = fdt_add_subnode (mDeviceTreeBase, 0, "/chosen");\r | |
283 | }\r | |
284 | \r | |
285 | if (NewNode < 0) {\r | |
286 | return EFI_OUT_OF_RESOURCES;\r | |
287 | }\r | |
288 | \r | |
289 | *Node = NewNode;\r | |
290 | \r | |
291 | return EFI_SUCCESS;\r | |
292 | }\r | |
293 | \r | |
294 | STATIC FDT_CLIENT_PROTOCOL mFdtClientProtocol = {\r | |
295 | GetNodeProperty,\r | |
296 | SetNodeProperty,\r | |
297 | FindCompatibleNode,\r | |
298 | FindNextCompatibleNode,\r | |
299 | FindCompatibleNodeProperty,\r | |
300 | FindCompatibleNodeReg,\r | |
969d2eb3 AB |
301 | FindMemoryNodeReg,\r |
302 | FindNextMemoryNodeReg,\r | |
30740795 AB |
303 | GetOrInsertChosenNode,\r |
304 | };\r | |
305 | \r | |
306 | EFI_STATUS\r | |
307 | EFIAPI\r | |
308 | InitializeFdtClientDxe (\r | |
309 | IN EFI_HANDLE ImageHandle,\r | |
310 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
311 | )\r | |
312 | {\r | |
313 | VOID *Hob;\r | |
314 | VOID *DeviceTreeBase;\r | |
1e7143d8 | 315 | EFI_STATUS Status;\r |
30740795 AB |
316 | \r |
317 | Hob = GetFirstGuidHob (&gFdtHobGuid);\r | |
318 | if (Hob == NULL || GET_GUID_HOB_DATA_SIZE (Hob) != sizeof (UINT64)) {\r | |
319 | return EFI_NOT_FOUND;\r | |
320 | }\r | |
321 | DeviceTreeBase = (VOID *)(UINTN)*(UINT64 *)GET_GUID_HOB_DATA (Hob);\r | |
322 | \r | |
323 | if (fdt_check_header (DeviceTreeBase) != 0) {\r | |
324 | DEBUG ((EFI_D_ERROR, "%a: No DTB found @ 0x%p\n", __FUNCTION__,\r | |
325 | DeviceTreeBase));\r | |
326 | return EFI_NOT_FOUND;\r | |
327 | }\r | |
328 | \r | |
329 | mDeviceTreeBase = DeviceTreeBase;\r | |
330 | \r | |
331 | DEBUG ((EFI_D_INFO, "%a: DTB @ 0x%p\n", __FUNCTION__, mDeviceTreeBase));\r | |
332 | \r | |
1e7143d8 AB |
333 | if (!FeaturePcdGet (PcdPureAcpiBoot)) {\r |
334 | //\r | |
335 | // Only install the FDT as a configuration table if we want to leave it up\r | |
336 | // to the OS to decide whether it prefers ACPI over DT.\r | |
337 | //\r | |
338 | Status = gBS->InstallConfigurationTable (&gFdtTableGuid, DeviceTreeBase);\r | |
339 | ASSERT_EFI_ERROR (Status);\r | |
340 | }\r | |
341 | \r | |
30740795 AB |
342 | return gBS->InstallProtocolInterface (&ImageHandle, &gFdtClientProtocolGuid,\r |
343 | EFI_NATIVE_INTERFACE, &mFdtClientProtocol);\r | |
344 | }\r |