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1 | /** @file\r |
2 | \r | |
3 | Copyright (c) 2004 - 2014, Intel Corporation. All rights reserved.<BR>\r | |
4 | \r\r | |
5 | This program and the accompanying materials are licensed and made available under\r\r | |
6 | the terms and conditions of the BSD License that accompanies this distribution. \r\r | |
7 | The full text of the license may be found at \r\r | |
8 | http://opensource.org/licenses/bsd-license.php. \r\r | |
9 | \r\r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r\r | |
12 | \r\r | |
13 | \r | |
14 | Module Name:\r | |
15 | \r | |
16 | \r | |
17 | Dimm.c\r | |
18 | \r | |
19 | Abstract:\r | |
20 | \r | |
21 | PPI for reading SPD modules on DIMMs.\r | |
22 | \r | |
23 | --*/\r | |
24 | \r | |
25 | \r | |
26 | //\r | |
27 | // Header Files\r | |
28 | //\r | |
29 | #include "Platformearlyinit.h"\r | |
30 | \r | |
31 | #define DIMM_SOCKETS 4 // Total number of DIMM sockets allowed on\r | |
32 | // the platform\r | |
33 | #define DIMM_SEGMENTS 1 // Total number of Segments Per DIMM.\r | |
34 | #define MEMORY_CHANNELS 2 // Total number of memory channels\r | |
35 | // populated on the system board\r | |
36 | //\r | |
37 | // Prototypes\r | |
38 | //\r | |
39 | \r | |
40 | EFI_STATUS\r | |
41 | EFIAPI\r | |
42 | GetDimmState (\r | |
43 | IN EFI_PEI_SERVICES **PeiServices,\r | |
44 | IN PEI_PLATFORM_DIMM_PPI *This,\r | |
45 | IN UINT8 Dimm,\r | |
46 | OUT PEI_PLATFORM_DIMM_STATE *State\r | |
47 | );\r | |
48 | \r | |
49 | EFI_STATUS\r | |
50 | EFIAPI\r | |
51 | SetDimmState (\r | |
52 | IN EFI_PEI_SERVICES **PeiServices,\r | |
53 | IN PEI_PLATFORM_DIMM_PPI *This,\r | |
54 | IN UINT8 Dimm,\r | |
55 | IN PEI_PLATFORM_DIMM_STATE *State\r | |
56 | );\r | |
57 | \r | |
58 | EFI_STATUS\r | |
59 | EFIAPI\r | |
60 | ReadSpd (\r | |
61 | IN EFI_PEI_SERVICES **PeiServices,\r | |
62 | IN PEI_PLATFORM_DIMM_PPI *This,\r | |
63 | IN UINT8 Dimm,\r | |
64 | IN UINT8 Offset,\r | |
65 | IN UINTN Count,\r | |
66 | IN OUT UINT8 *Buffer\r | |
67 | );\r | |
68 | \r | |
69 | static PEI_PLATFORM_DIMM_PPI mGchDimmPpi = {\r | |
70 | DIMM_SOCKETS,\r | |
71 | DIMM_SEGMENTS,\r | |
72 | MEMORY_CHANNELS,\r | |
73 | GetDimmState,\r | |
74 | SetDimmState,\r | |
75 | ReadSpd\r | |
76 | };\r | |
77 | \r | |
78 | static EFI_PEI_PPI_DESCRIPTOR mPpiPlatformDimm = {\r | |
79 | (EFI_PEI_PPI_DESCRIPTOR_PPI | EFI_PEI_PPI_DESCRIPTOR_TERMINATE_LIST),\r | |
80 | &gPeiPlatformDimmPpiGuid,\r | |
81 | &mGchDimmPpi\r | |
82 | };\r | |
83 | \r | |
84 | \r | |
85 | //\r | |
86 | // Functions\r | |
87 | //\r | |
88 | \r | |
89 | /**\r | |
90 | This function returns the current state of a single DIMM. Present indicates\r | |
91 | that the DIMM slot is physically populated. Disabled indicates that the DIMM\r | |
92 | should not be used.\r | |
93 | \r | |
94 | @param PeiServices PEI services table pointer\r | |
95 | @param This PPI pointer\r | |
96 | @param Dimm DIMM to read from\r | |
97 | @param State Pointer to a return buffer to be updated with the current state\r | |
98 | of the DIMM\r | |
99 | \r | |
100 | @retval EFI_SUCCESS The function completed successfully.\r | |
101 | \r | |
102 | **/\r | |
103 | EFI_STATUS\r | |
104 | EFIAPI\r | |
105 | GetDimmState (\r | |
106 | IN EFI_PEI_SERVICES **PeiServices,\r | |
107 | IN PEI_PLATFORM_DIMM_PPI *This,\r | |
108 | IN UINT8 Dimm,\r | |
109 | OUT PEI_PLATFORM_DIMM_STATE *State\r | |
110 | )\r | |
111 | {\r | |
112 | EFI_STATUS Status;\r | |
113 | UINT8 Buffer;\r | |
114 | \r | |
115 | PEI_ASSERT (PeiServices, (Dimm < This->DimmSockets));\r | |
116 | \r | |
117 | //\r | |
118 | // A failure here does not necessarily mean that no DIMM is present.\r | |
119 | // Read a single byte. All we care about is the return status.\r | |
120 | //\r | |
121 | Status = ReadSpd (\r | |
122 | PeiServices,\r | |
123 | This,\r | |
124 | Dimm,\r | |
125 | 0,\r | |
126 | 1,\r | |
127 | &Buffer\r | |
128 | );\r | |
129 | \r | |
130 | if (EFI_ERROR (Status)) {\r | |
131 | State->Present = 0;\r | |
132 | } else {\r | |
133 | State->Present = 1;\r | |
134 | }\r | |
135 | \r | |
136 | //\r | |
137 | // BUGBUG: Update to check platform variable when it is available\r | |
138 | //\r | |
139 | State->Disabled = 0;\r | |
140 | State->Reserved = 0;\r | |
141 | \r | |
142 | return EFI_SUCCESS;\r | |
143 | }\r | |
144 | \r | |
145 | /**\r | |
146 | \r | |
147 | This function updates the state of a single DIMM.\r | |
148 | \r | |
149 | @param PeiServices PEI services table pointer\r | |
150 | @param This PPI pointer\r | |
151 | @param Dimm DIMM to set state for\r | |
152 | @param State Pointer to the state information to set.\r | |
153 | \r | |
154 | @retval EFI_SUCCESS The function completed successfully.\r | |
155 | @retval EFI_UNSUPPORTED The function is not supported.\r | |
156 | \r | |
157 | **/\r | |
158 | EFI_STATUS\r | |
159 | EFIAPI\r | |
160 | SetDimmState (\r | |
161 | IN EFI_PEI_SERVICES **PeiServices,\r | |
162 | IN PEI_PLATFORM_DIMM_PPI *This,\r | |
163 | IN UINT8 Dimm,\r | |
164 | IN PEI_PLATFORM_DIMM_STATE *State\r | |
165 | )\r | |
166 | {\r | |
167 | return EFI_UNSUPPORTED;\r | |
168 | }\r | |
169 | \r | |
170 | /**\r | |
171 | This function reads SPD information from a DIMM.\r | |
172 | \r | |
173 | PeiServices PEI services table pointer\r | |
174 | This PPI pointer\r | |
175 | Dimm DIMM to read from\r | |
176 | Offset Offset in DIMM\r | |
177 | Count Number of bytes\r | |
178 | Buffer Return buffer\r | |
179 | \r | |
180 | @param EFI_SUCCESS The function completed successfully.\r | |
181 | @param EFI_DEVICE_ERROR The DIMM being accessed reported a device error,\r | |
182 | does not have an SPD module, or is not installed in\r | |
183 | the system.\r | |
184 | @retval EFI_TIMEOUT Time out trying to read the SPD module.\r | |
185 | @retval EFI_INVALID_PARAMETER A parameter was outside the legal limits.\r | |
186 | \r | |
187 | **/\r | |
188 | EFI_STATUS\r | |
189 | EFIAPI\r | |
190 | ReadSpd (\r | |
191 | IN EFI_PEI_SERVICES **PeiServices,\r | |
192 | IN PEI_PLATFORM_DIMM_PPI *This,\r | |
193 | IN UINT8 Dimm,\r | |
194 | IN UINT8 Offset,\r | |
195 | IN UINTN Count,\r | |
196 | IN OUT UINT8 *Buffer\r | |
197 | )\r | |
198 | {\r | |
199 | EFI_STATUS Status;\r | |
200 | PEI_SMBUS_PPI *Smbus;\r | |
201 | UINTN Index;\r | |
202 | UINTN Index1;\r | |
203 | EFI_SMBUS_DEVICE_ADDRESS SlaveAddress;\r | |
204 | EFI_SMBUS_DEVICE_COMMAND Command;\r | |
205 | UINTN Length;\r | |
206 | \r | |
207 | Status = (**PeiServices).LocatePpi (\r | |
208 | PeiServices,\r | |
209 | &gPeiSmbusPpiGuid, // GUID\r | |
210 | 0, // INSTANCE\r | |
211 | NULL, // EFI_PEI_PPI_DESCRIPTOR\r | |
212 | &Smbus // PPI\r | |
213 | );\r | |
214 | ASSERT_PEI_ERROR (PeiServices, Status);\r | |
215 | \r | |
216 | switch (Dimm) {\r | |
217 | case 0:\r | |
218 | SlaveAddress.SmbusDeviceAddress = SMBUS_ADDR_CH_A_1 >> 1;\r | |
219 | break;\r | |
220 | case 1:\r | |
221 | SlaveAddress.SmbusDeviceAddress = SMBUS_ADDR_CH_A_2 >> 1;\r | |
222 | break;\r | |
223 | case 2:\r | |
224 | SlaveAddress.SmbusDeviceAddress = SMBUS_ADDR_CH_B_1 >> 1;\r | |
225 | break;\r | |
226 | case 3:\r | |
227 | SlaveAddress.SmbusDeviceAddress = SMBUS_ADDR_CH_B_2 >> 1;\r | |
228 | break;\r | |
229 | default:\r | |
230 | return EFI_INVALID_PARAMETER;\r | |
231 | }\r | |
232 | \r | |
233 | Index = Count % 4;\r | |
234 | if (Index != 0) {\r | |
235 | //\r | |
236 | // read the first serveral bytes to speed up following reading\r | |
237 | //\r | |
238 | for (Index1 = 0; Index1 < Index; Index1++) {\r | |
239 | Length = 1;\r | |
240 | Command = Offset + Index1;\r | |
241 | Status = Smbus->Execute (\r | |
242 | PeiServices,\r | |
243 | Smbus,\r | |
244 | SlaveAddress,\r | |
245 | Command,\r | |
246 | EfiSmbusReadByte,\r | |
247 | FALSE,\r | |
248 | &Length,\r | |
249 | &Buffer[Index1]\r | |
250 | );\r | |
251 | if (EFI_ERROR(Status)) {\r | |
252 | return Status;\r | |
253 | }\r | |
254 | }\r | |
255 | }\r | |
256 | \r | |
257 | //\r | |
258 | // Now collect all the remaining bytes on 4 bytes block\r | |
259 | //\r | |
260 | for (; Index < Count; Index += 2) {\r | |
261 | Command = Index + Offset;\r | |
262 | Length = 2;\r | |
263 | Status = Smbus->Execute (\r | |
264 | PeiServices,\r | |
265 | Smbus,\r | |
266 | SlaveAddress,\r | |
267 | Command,\r | |
268 | EfiSmbusReadWord,\r | |
269 | FALSE,\r | |
270 | &Length,\r | |
271 | &Buffer[Index]\r | |
272 | );\r | |
273 | if (EFI_ERROR(Status)) {\r | |
274 | return Status;\r | |
275 | }\r | |
276 | \r | |
277 | Index += 2;\r | |
278 | Command = Index + Offset;\r | |
279 | Length = 2;\r | |
280 | Status = Smbus->Execute (\r | |
281 | PeiServices,\r | |
282 | Smbus,\r | |
283 | SlaveAddress,\r | |
284 | Command,\r | |
285 | EfiSmbusReadWord,\r | |
286 | FALSE,\r | |
287 | &Length,\r | |
288 | &Buffer[Index]\r | |
289 | );\r | |
290 | if (EFI_ERROR(Status)) {\r | |
291 | return Status;\r | |
292 | }\r | |
293 | }\r | |
294 | return EFI_SUCCESS;\r | |
295 | }\r | |
296 | \r | |
297 | /**\r | |
298 | This function initializes the PEIM. It simply installs the DIMM PPI.\r | |
299 | \r | |
300 | @param FfsHeader Not used by this function\r | |
301 | @param PeiServices Pointer to PEI services table\r | |
302 | \r | |
303 | @retval EFI_SUCCESS The function completed successfully.\r | |
304 | \r | |
305 | **/\r | |
306 | EFI_STATUS\r | |
307 | EFIAPI\r | |
308 | PeimInitializeDimm (\r | |
309 | IN EFI_PEI_SERVICES **PeiServices,\r | |
310 | IN EFI_PEI_NOTIFY_DESCRIPTOR *NotifyDescriptor,\r | |
311 | IN VOID *SmbusPpi\r | |
312 | )\r | |
313 | {\r | |
314 | EFI_STATUS Status;\r | |
315 | \r | |
316 | Status = (**PeiServices).InstallPpi (\r | |
317 | PeiServices,\r | |
318 | &mPpiPlatformDimm\r | |
319 | );\r | |
320 | ASSERT_PEI_ERROR (PeiServices, Status);\r | |
321 | \r | |
322 | return EFI_SUCCESS;\r | |
323 | }\r | |
324 | \r |