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1 | /** @file\r |
2 | * Device tree enumeration DXE driver for ARM Virtual Machines\r | |
3 | *\r | |
4 | * Copyright (c) 2014, 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/UefiLib.h>\r | |
19 | #include <Library/BaseMemoryLib.h>\r | |
20 | #include <Library/UefiDriverEntryPoint.h>\r | |
21 | #include <Library/MemoryAllocationLib.h>\r | |
22 | #include <Library/UefiBootServicesTableLib.h>\r | |
23 | #include <Library/VirtioMmioDeviceLib.h>\r | |
24 | #include <Library/DevicePathLib.h>\r | |
25 | #include <Library/PcdLib.h>\r | |
26 | #include <Library/DxeServicesLib.h>\r | |
27 | #include <libfdt.h>\r | |
28 | \r | |
29 | #include <Guid/Fdt.h>\r | |
30 | \r | |
31 | #pragma pack (1)\r | |
32 | typedef struct {\r | |
33 | VENDOR_DEVICE_PATH Vendor;\r | |
34 | UINT64 PhysBase;\r | |
35 | EFI_DEVICE_PATH_PROTOCOL End;\r | |
36 | } VIRTIO_TRANSPORT_DEVICE_PATH;\r | |
37 | #pragma pack ()\r | |
38 | \r | |
39 | typedef enum {\r | |
40 | PropertyTypeUnknown,\r | |
41 | PropertyTypeGic,\r | |
42 | PropertyTypeRtc,\r | |
43 | PropertyTypeVirtio,\r | |
44 | PropertyTypeUart,\r | |
45 | PropertyTypeTimer,\r | |
46 | PropertyTypePsci,\r | |
47 | } PROPERTY_TYPE;\r | |
48 | \r | |
49 | typedef struct {\r | |
50 | PROPERTY_TYPE Type;\r | |
51 | CHAR8 Compatible[20];\r | |
52 | } PROPERTY;\r | |
53 | \r | |
54 | STATIC CONST PROPERTY CompatibleProperties[] = {\r | |
55 | { PropertyTypeGic, "arm,cortex-a15-gic" },\r | |
56 | { PropertyTypeRtc, "arm,pl031" },\r | |
57 | { PropertyTypeVirtio, "virtio,mmio" },\r | |
58 | { PropertyTypeUart, "arm,pl011" },\r | |
59 | { PropertyTypeTimer, "arm,armv7-timer" },\r | |
60 | { PropertyTypeTimer, "arm,armv8-timer" },\r | |
61 | { PropertyTypePsci, "arm,psci-0.2" },\r | |
62 | { PropertyTypeUnknown, "" }\r | |
63 | };\r | |
64 | \r | |
65 | typedef struct {\r | |
66 | UINT32 Type;\r | |
67 | UINT32 Number;\r | |
68 | UINT32 Flags;\r | |
69 | } INTERRUPT_PROPERTY;\r | |
70 | \r | |
71 | STATIC\r | |
72 | PROPERTY_TYPE\r | |
73 | GetTypeFromNode (\r | |
74 | IN CONST CHAR8 *NodeType,\r | |
75 | IN UINTN Size\r | |
76 | )\r | |
77 | {\r | |
78 | CONST CHAR8 *Compatible;\r | |
79 | CONST PROPERTY *CompatibleProperty;\r | |
80 | \r | |
81 | //\r | |
82 | // A 'compatible' node may contain a sequence of NULL terminated\r | |
83 | // compatible strings so check each one\r | |
84 | //\r | |
85 | for (Compatible = NodeType; Compatible < NodeType + Size && *Compatible;\r | |
86 | Compatible += 1 + AsciiStrLen (Compatible)) {\r | |
87 | for (CompatibleProperty = CompatibleProperties; CompatibleProperty->Compatible[0]; CompatibleProperty++) {\r | |
88 | if (AsciiStrCmp (CompatibleProperty->Compatible, Compatible) == 0) {\r | |
89 | return CompatibleProperty->Type;\r | |
90 | }\r | |
91 | }\r | |
92 | }\r | |
93 | return PropertyTypeUnknown;\r | |
94 | }\r | |
95 | \r | |
96 | EFI_STATUS\r | |
97 | EFIAPI\r | |
98 | InitializeVirtFdtDxe (\r | |
99 | IN EFI_HANDLE ImageHandle,\r | |
100 | IN EFI_SYSTEM_TABLE *SystemTable\r | |
101 | )\r | |
102 | {\r | |
103 | VOID *DeviceTreeBase;\r | |
104 | INT32 Node, Prev;\r | |
105 | INT32 RtcNode;\r | |
106 | EFI_STATUS Status;\r | |
107 | CONST CHAR8 *Type;\r | |
108 | INT32 Len;\r | |
109 | PROPERTY_TYPE PropType;\r | |
110 | CONST VOID *RegProp;\r | |
111 | VIRTIO_TRANSPORT_DEVICE_PATH *DevicePath;\r | |
112 | EFI_HANDLE Handle;\r | |
113 | UINT64 RegBase;\r | |
114 | UINT64 DistBase, CpuBase;\r | |
115 | CONST INTERRUPT_PROPERTY *InterruptProp;\r | |
116 | INT32 SecIntrNum, IntrNum, VirtIntrNum, HypIntrNum;\r | |
117 | CONST CHAR8 *PsciMethod;\r | |
118 | \r | |
119 | DeviceTreeBase = (VOID *)(UINTN)PcdGet64 (PcdDeviceTreeBaseAddress);\r | |
120 | ASSERT (DeviceTreeBase != NULL);\r | |
121 | \r | |
122 | if (fdt_check_header (DeviceTreeBase) != 0) {\r | |
123 | DEBUG ((EFI_D_ERROR, "%a: No DTB found @ 0x%p\n", __FUNCTION__, DeviceTreeBase));\r | |
124 | return EFI_NOT_FOUND;\r | |
125 | }\r | |
126 | \r | |
127 | Status = gBS->InstallConfigurationTable (&gFdtTableGuid, DeviceTreeBase);\r | |
128 | ASSERT_EFI_ERROR (Status);\r | |
129 | \r | |
130 | DEBUG ((EFI_D_INFO, "%a: DTB @ 0x%p\n", __FUNCTION__, DeviceTreeBase));\r | |
131 | \r | |
132 | RtcNode = -1;\r | |
133 | //\r | |
134 | // Now enumerate the nodes and install peripherals that we are interested in,\r | |
135 | // i.e., GIC, RTC and virtio MMIO nodes\r | |
136 | //\r | |
137 | for (Prev = 0;; Prev = Node) {\r | |
138 | Node = fdt_next_node (DeviceTreeBase, Prev, NULL);\r | |
139 | if (Node < 0) {\r | |
140 | break;\r | |
141 | }\r | |
142 | \r | |
143 | Type = fdt_getprop (DeviceTreeBase, Node, "compatible", &Len);\r | |
144 | if (Type == NULL) {\r | |
145 | continue;\r | |
146 | }\r | |
147 | \r | |
148 | PropType = GetTypeFromNode (Type, Len);\r | |
149 | if (PropType == PropertyTypeUnknown) {\r | |
150 | continue;\r | |
151 | }\r | |
152 | \r | |
153 | //\r | |
154 | // Get the 'reg' property of this node. For now, we will assume\r | |
155 | // 8 byte quantities for base and size, respectively.\r | |
156 | // TODO use #cells root properties instead\r | |
157 | //\r | |
158 | RegProp = fdt_getprop (DeviceTreeBase, Node, "reg", &Len);\r | |
159 | ASSERT ((RegProp != NULL) || (PropType == PropertyTypeTimer) ||\r | |
160 | (PropType == PropertyTypePsci));\r | |
161 | \r | |
162 | switch (PropType) {\r | |
163 | case PropertyTypeVirtio:\r | |
164 | ASSERT (Len == 16);\r | |
165 | //\r | |
166 | // Create a unique device path for this transport on the fly\r | |
167 | //\r | |
168 | RegBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]);\r | |
169 | DevicePath = (VIRTIO_TRANSPORT_DEVICE_PATH *)CreateDeviceNode (\r | |
170 | HARDWARE_DEVICE_PATH,\r | |
171 | HW_VENDOR_DP,\r | |
172 | sizeof (VIRTIO_TRANSPORT_DEVICE_PATH));\r | |
173 | if (DevicePath == NULL) {\r | |
174 | DEBUG ((EFI_D_ERROR, "%a: Out of memory\n", __FUNCTION__));\r | |
175 | break;\r | |
176 | }\r | |
177 | \r | |
178 | CopyMem (&DevicePath->Vendor.Guid, &gEfiCallerIdGuid, sizeof (EFI_GUID));\r | |
179 | DevicePath->PhysBase = RegBase;\r | |
180 | SetDevicePathNodeLength (&DevicePath->Vendor,\r | |
181 | sizeof (*DevicePath) - sizeof (DevicePath->End));\r | |
182 | SetDevicePathEndNode (&DevicePath->End);\r | |
183 | \r | |
184 | Handle = NULL;\r | |
185 | Status = gBS->InstallProtocolInterface (&Handle,\r | |
186 | &gEfiDevicePathProtocolGuid, EFI_NATIVE_INTERFACE,\r | |
187 | DevicePath);\r | |
188 | if (EFI_ERROR (Status)) {\r | |
189 | DEBUG ((EFI_D_ERROR, "%a: Failed to install the EFI_DEVICE_PATH "\r | |
190 | "protocol on a new handle (Status == %r)\n",\r | |
191 | __FUNCTION__, Status));\r | |
192 | FreePool (DevicePath);\r | |
193 | break;\r | |
194 | }\r | |
195 | \r | |
196 | Status = VirtioMmioInstallDevice (RegBase, Handle);\r | |
197 | if (EFI_ERROR (Status)) {\r | |
198 | DEBUG ((EFI_D_ERROR, "%a: Failed to install VirtIO transport @ 0x%Lx "\r | |
199 | "on handle %p (Status == %r)\n", __FUNCTION__, RegBase,\r | |
200 | Handle, Status));\r | |
201 | \r | |
202 | Status = gBS->UninstallProtocolInterface (Handle,\r | |
203 | &gEfiDevicePathProtocolGuid, DevicePath);\r | |
204 | ASSERT_EFI_ERROR (Status);\r | |
205 | FreePool (DevicePath);\r | |
206 | }\r | |
207 | break;\r | |
208 | \r | |
209 | case PropertyTypeGic:\r | |
210 | ASSERT (Len == 32);\r | |
211 | \r | |
212 | DistBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]);\r | |
213 | CpuBase = fdt64_to_cpu (((UINT64 *)RegProp)[2]);\r | |
214 | ASSERT (DistBase < MAX_UINT32);\r | |
215 | ASSERT (CpuBase < MAX_UINT32);\r | |
216 | \r | |
217 | PcdSet32 (PcdGicDistributorBase, (UINT32)DistBase);\r | |
218 | PcdSet32 (PcdGicInterruptInterfaceBase, (UINT32)CpuBase);\r | |
219 | \r | |
220 | DEBUG ((EFI_D_INFO, "Found GIC @ 0x%Lx/0x%Lx\n", DistBase, CpuBase));\r | |
221 | break;\r | |
222 | \r | |
223 | case PropertyTypeRtc:\r | |
224 | ASSERT (Len == 16);\r | |
225 | \r | |
226 | RegBase = fdt64_to_cpu (((UINT64 *)RegProp)[0]);\r | |
227 | ASSERT (RegBase < MAX_UINT32);\r | |
228 | \r | |
229 | PcdSet32 (PcdPL031RtcBase, (UINT32)RegBase);\r | |
230 | \r | |
231 | DEBUG ((EFI_D_INFO, "Found PL031 RTC @ 0x%Lx\n", RegBase));\r | |
232 | RtcNode = Node;\r | |
233 | break;\r | |
234 | \r | |
235 | case PropertyTypeTimer:\r | |
236 | //\r | |
237 | // - interrupts : Interrupt list for secure, non-secure, virtual and\r | |
238 | // hypervisor timers, in that order.\r | |
239 | //\r | |
240 | InterruptProp = fdt_getprop (DeviceTreeBase, Node, "interrupts", &Len);\r | |
241 | ASSERT (Len == 48);\r | |
242 | \r | |
243 | SecIntrNum = fdt32_to_cpu (InterruptProp[0].Number)\r | |
244 | + (InterruptProp[0].Type ? 16 : 0);\r | |
245 | IntrNum = fdt32_to_cpu (InterruptProp[1].Number)\r | |
246 | + (InterruptProp[1].Type ? 16 : 0);\r | |
247 | VirtIntrNum = fdt32_to_cpu (InterruptProp[2].Number)\r | |
248 | + (InterruptProp[2].Type ? 16 : 0);\r | |
249 | HypIntrNum = fdt32_to_cpu (InterruptProp[3].Number)\r | |
250 | + (InterruptProp[3].Type ? 16 : 0);\r | |
251 | \r | |
252 | DEBUG ((EFI_D_INFO, "Found Timer interrupts %d, %d, %d, %d\n",\r | |
253 | SecIntrNum, IntrNum, VirtIntrNum, HypIntrNum));\r | |
254 | \r | |
255 | PcdSet32 (PcdArmArchTimerSecIntrNum, SecIntrNum);\r | |
256 | PcdSet32 (PcdArmArchTimerIntrNum, IntrNum);\r | |
257 | PcdSet32 (PcdArmArchTimerVirtIntrNum, VirtIntrNum);\r | |
258 | PcdSet32 (PcdArmArchTimerHypIntrNum, HypIntrNum);\r | |
259 | break;\r | |
260 | \r | |
261 | case PropertyTypePsci:\r | |
262 | PsciMethod = fdt_getprop (DeviceTreeBase, Node, "method", &Len);\r | |
263 | \r | |
264 | if (PsciMethod && AsciiStrnCmp (PsciMethod, "hvc", 3) == 0) {\r | |
265 | PcdSet32 (PcdArmPsciMethod, 1);\r | |
266 | } else if (PsciMethod && AsciiStrnCmp (PsciMethod, "smc", 3) == 0) {\r | |
267 | PcdSet32 (PcdArmPsciMethod, 2);\r | |
268 | } else {\r | |
269 | DEBUG ((EFI_D_ERROR, "%a: Unknown PSCI method \"%a\"\n", __FUNCTION__,\r | |
270 | PsciMethod));\r | |
271 | }\r | |
272 | break;\r | |
273 | \r | |
274 | default:\r | |
275 | break;\r | |
276 | }\r | |
277 | }\r | |
278 | \r | |
279 | //\r | |
280 | // UEFI takes ownership of the RTC hardware, and exposes its functionality\r | |
281 | // through the UEFI Runtime Services GetTime, SetTime, etc. This means we\r | |
282 | // need to disable it in the device tree to prevent the OS from attaching its\r | |
283 | // device driver as well.\r | |
284 | //\r | |
285 | if ((RtcNode != -1) &&\r | |
286 | fdt_setprop_string (DeviceTreeBase, RtcNode, "status",\r | |
287 | "disabled") != 0) {\r | |
288 | DEBUG ((EFI_D_WARN, "Failed to set PL031 status to 'disabled'\n"));\r | |
289 | }\r | |
290 | return EFI_SUCCESS;\r | |
291 | }\r |