]>
Commit | Line | Data |
---|---|---|
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 | |
23 | #include <Guid/Fdt.h>\r | |
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 | |
162 | OUT UINT32 *RegElemSize,\r | |
163 | OUT UINT32 *RegSize\r | |
164 | )\r | |
165 | {\r | |
166 | EFI_STATUS Status;\r | |
167 | \r | |
168 | ASSERT (RegSize != NULL);\r | |
169 | \r | |
170 | //\r | |
171 | // Get the 'reg' property of this node. For now, we will assume\r | |
172 | // 8 byte quantities for base and size, respectively.\r | |
173 | // TODO use #cells root properties instead\r | |
174 | //\r | |
175 | Status = FindCompatibleNodeProperty (This, CompatibleString, "reg", Reg,\r | |
176 | RegSize);\r | |
177 | if (EFI_ERROR (Status)) {\r | |
178 | return Status;\r | |
179 | }\r | |
180 | \r | |
181 | if ((*RegSize % 16) != 0) {\r | |
182 | DEBUG ((EFI_D_ERROR,\r | |
183 | "%a: '%a' compatible node has invalid 'reg' property (size == 0x%x)\n",\r | |
184 | __FUNCTION__, CompatibleString, *RegSize));\r | |
185 | return EFI_NOT_FOUND;\r | |
186 | }\r | |
187 | \r | |
188 | *RegElemSize = 8;\r | |
189 | \r | |
190 | return EFI_SUCCESS;\r | |
191 | }\r | |
192 | \r | |
193 | STATIC\r | |
194 | EFI_STATUS\r | |
195 | GetOrInsertChosenNode (\r | |
196 | IN FDT_CLIENT_PROTOCOL *This,\r | |
197 | OUT INT32 *Node\r | |
198 | )\r | |
199 | {\r | |
200 | INT32 NewNode;\r | |
201 | \r | |
202 | ASSERT (mDeviceTreeBase != NULL);\r | |
203 | ASSERT (Node != NULL);\r | |
204 | \r | |
205 | NewNode = fdt_path_offset (mDeviceTreeBase, "/chosen");\r | |
206 | if (NewNode < 0) {\r | |
207 | NewNode = fdt_add_subnode (mDeviceTreeBase, 0, "/chosen");\r | |
208 | }\r | |
209 | \r | |
210 | if (NewNode < 0) {\r | |
211 | return EFI_OUT_OF_RESOURCES;\r | |
212 | }\r | |
213 | \r | |
214 | *Node = NewNode;\r | |
215 | \r | |
216 | return EFI_SUCCESS;\r | |
217 | }\r | |
218 | \r | |
219 | STATIC FDT_CLIENT_PROTOCOL mFdtClientProtocol = {\r | |
220 | GetNodeProperty,\r | |
221 | SetNodeProperty,\r | |
222 | FindCompatibleNode,\r | |
223 | FindNextCompatibleNode,\r | |
224 | FindCompatibleNodeProperty,\r | |
225 | FindCompatibleNodeReg,\r | |
226 | GetOrInsertChosenNode,\r | |
227 | };\r | |
228 | \r | |
229 | EFI_STATUS\r | |
230 | EFIAPI\r | |
231 | InitializeFdtClientDxe (\r | |
232 | IN EFI_HANDLE ImageHandle,\r | |
233 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
234 | )\r | |
235 | {\r | |
236 | VOID *Hob;\r | |
237 | VOID *DeviceTreeBase;\r | |
238 | EFI_STATUS Status;\r | |
239 | \r | |
240 | Hob = GetFirstGuidHob (&gFdtHobGuid);\r | |
241 | if (Hob == NULL || GET_GUID_HOB_DATA_SIZE (Hob) != sizeof (UINT64)) {\r | |
242 | return EFI_NOT_FOUND;\r | |
243 | }\r | |
244 | DeviceTreeBase = (VOID *)(UINTN)*(UINT64 *)GET_GUID_HOB_DATA (Hob);\r | |
245 | \r | |
246 | if (fdt_check_header (DeviceTreeBase) != 0) {\r | |
247 | DEBUG ((EFI_D_ERROR, "%a: No DTB found @ 0x%p\n", __FUNCTION__,\r | |
248 | DeviceTreeBase));\r | |
249 | return EFI_NOT_FOUND;\r | |
250 | }\r | |
251 | \r | |
252 | mDeviceTreeBase = DeviceTreeBase;\r | |
253 | \r | |
254 | DEBUG ((EFI_D_INFO, "%a: DTB @ 0x%p\n", __FUNCTION__, mDeviceTreeBase));\r | |
255 | \r | |
256 | if (!FeaturePcdGet (PcdPureAcpiBoot)) {\r | |
257 | //\r | |
258 | // Only install the FDT as a configuration table if we want to leave it up\r | |
259 | // to the OS to decide whether it prefers ACPI over DT.\r | |
260 | //\r | |
261 | Status = gBS->InstallConfigurationTable (&gFdtTableGuid, DeviceTreeBase);\r | |
262 | ASSERT_EFI_ERROR (Status);\r | |
263 | }\r | |
264 | \r | |
265 | return gBS->InstallProtocolInterface (&ImageHandle, &gFdtClientProtocolGuid,\r | |
266 | EFI_NATIVE_INTERFACE, &mFdtClientProtocol);\r | |
267 | }\r |