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1 | /** @file\r | |
2 | Basic TIS (TPM Interface Specification) functions for Atmel I2C TPM.\r | |
3 | \r | |
4 | Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>\r | |
5 | This program and the accompanying materials\r | |
6 | are licensed and made available under the terms and conditions of the BSD License\r | |
7 | which accompanies this distribution. The full text of the license may be found at\r | |
8 | http://opensource.org/licenses/bsd-license.php\r | |
9 | \r | |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r | |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
12 | \r | |
13 | **/\r | |
14 | \r | |
15 | #include <PiPei.h>\r | |
16 | #include <Library/Tpm12DeviceLib.h>\r | |
17 | #include <Library/BaseLib.h>\r | |
18 | #include <Library/TimerLib.h>\r | |
19 | #include <Library/DebugLib.h>\r | |
20 | #include <Library/I2cLib.h>\r | |
21 | \r | |
22 | //\r | |
23 | // Atmel I2C TPM slave address\r | |
24 | //\r | |
25 | #define ATMEL_I2C_TPM_SLAVE_ADDRESS 0x29\r | |
26 | \r | |
27 | //\r | |
28 | // Maximum I2C transfer size for Atmel I2C TPM\r | |
29 | //\r | |
30 | #define ATMEL_I2C_TPM_MAX_TRANSFER_SIZE 0x10\r | |
31 | \r | |
32 | //\r | |
33 | // Default TimeOut values in microseconds\r | |
34 | //\r | |
35 | #define TIS_TIMEOUT_A ( 750 * 1000) // 750ms\r | |
36 | #define TIS_TIMEOUT_B (2000 * 1000) // 2s\r | |
37 | #define TIS_TIMEOUT_C ( 750 * 1000) // 750ms\r | |
38 | #define TIS_TIMEOUT_D ( 750 * 1000) // 750ms\r | |
39 | \r | |
40 | /**\r | |
41 | Send command to Atmel I2c TPM breaking request up into multiple I2C transfers\r | |
42 | if required.\r | |
43 | \r | |
44 | @param[in] Buffer Pointer to TPM command data.\r | |
45 | @param[in] Length Number of bytes of TPM command data.\r | |
46 | \r | |
47 | @retval EFI_SUCCESS TPM command sent.\r | |
48 | @retval EFI_NOT_FOUND TPM chip doesn't exit.\r | |
49 | @retval EFI_TIMEOUT Can't get the TPM control in time.\r | |
50 | **/\r | |
51 | EFI_STATUS\r | |
52 | WriteTpmBufferMultiple (\r | |
53 | IN UINT8 *Buffer,\r | |
54 | IN UINTN Length\r | |
55 | )\r | |
56 | {\r | |
57 | EFI_STATUS Status;\r | |
58 | EFI_I2C_DEVICE_ADDRESS I2CDeviceAddr;\r | |
59 | UINTN Index;\r | |
60 | UINTN PartialLength;\r | |
61 | \r | |
62 | I2CDeviceAddr.I2CDeviceAddress = ATMEL_I2C_TPM_SLAVE_ADDRESS;\r | |
63 | \r | |
64 | DEBUG ((EFI_D_VERBOSE, "WriteTpmBufferMultiple: Addr=%02x Length=%02x\n", I2CDeviceAddr.I2CDeviceAddress, Length));\r | |
65 | \r | |
66 | for (PartialLength = 0; Length > 0; Length -= PartialLength, Buffer += PartialLength) {\r | |
67 | //\r | |
68 | // Write data to TPM.\r | |
69 | //\r | |
70 | PartialLength = MIN (Length, ATMEL_I2C_TPM_MAX_TRANSFER_SIZE);\r | |
71 | Status = I2cWriteMultipleByte (\r | |
72 | I2CDeviceAddr,\r | |
73 | EfiI2CSevenBitAddrMode,\r | |
74 | &PartialLength,\r | |
75 | Buffer\r | |
76 | );\r | |
77 | DEBUG ((EFI_D_VERBOSE, " "));\r | |
78 | for (Index = 0; Index < PartialLength; Index++) {\r | |
79 | DEBUG ((EFI_D_VERBOSE, "%02x ", Buffer[Index]));\r | |
80 | }\r | |
81 | DEBUG ((EFI_D_VERBOSE, "\n"));\r | |
82 | if (EFI_ERROR (Status)) {\r | |
83 | DEBUG ((EFI_D_VERBOSE, " Status = %r\n", Status));\r | |
84 | return Status;\r | |
85 | }\r | |
86 | }\r | |
87 | \r | |
88 | DEBUG ((EFI_D_VERBOSE, " Status = %r\n", Status));\r | |
89 | return Status;\r | |
90 | }\r | |
91 | \r | |
92 | /**\r | |
93 | Receive a response to a command from Atmel I2c TPM breaking response into\r | |
94 | multiple I2C transfers if required.\r | |
95 | \r | |
96 | @param[out] Buffer Pointer to TPM response data.\r | |
97 | @param[in] Length Maximum number of bytes to receive.\r | |
98 | \r | |
99 | @retval EFI_SUCCESS TPM response received.\r | |
100 | @retval EFI_NOT_FOUND TPM chip doesn't exit.\r | |
101 | @retval EFI_TIMEOUT Can't get the TPM control in time.\r | |
102 | **/\r | |
103 | EFI_STATUS\r | |
104 | ReadTpmBufferMultiple (\r | |
105 | OUT UINT8 *Buffer,\r | |
106 | IN UINTN Length\r | |
107 | )\r | |
108 | {\r | |
109 | EFI_STATUS Status;\r | |
110 | EFI_I2C_DEVICE_ADDRESS I2CDeviceAddr;\r | |
111 | UINTN WriteLength;\r | |
112 | UINTN Index;\r | |
113 | UINTN PartialLength;\r | |
114 | \r | |
115 | I2CDeviceAddr.I2CDeviceAddress = ATMEL_I2C_TPM_SLAVE_ADDRESS;\r | |
116 | WriteLength = 0;\r | |
117 | \r | |
118 | DEBUG ((EFI_D_VERBOSE, "ReadTpmBufferMultiple: Addr=%02x Length=%02x\n", I2CDeviceAddr.I2CDeviceAddress, Length));\r | |
119 | \r | |
120 | for (PartialLength = 0; Length > 0; Length -= PartialLength, Buffer += PartialLength) {\r | |
121 | //\r | |
122 | // Read data from TPM.\r | |
123 | //\r | |
124 | PartialLength = MIN (Length, ATMEL_I2C_TPM_MAX_TRANSFER_SIZE);\r | |
125 | Status = I2cReadMultipleByte (\r | |
126 | I2CDeviceAddr,\r | |
127 | EfiI2CSevenBitAddrMode,\r | |
128 | &WriteLength,\r | |
129 | &PartialLength,\r | |
130 | Buffer\r | |
131 | );\r | |
132 | if (!EFI_ERROR (Status)) {\r | |
133 | DEBUG ((EFI_D_VERBOSE, " "));\r | |
134 | for (Index = 0; Index < PartialLength; Index++) {\r | |
135 | DEBUG ((EFI_D_VERBOSE, "%02x ", Buffer[Index]));\r | |
136 | }\r | |
137 | DEBUG ((EFI_D_VERBOSE, "\n"));\r | |
138 | }\r | |
139 | if (EFI_ERROR (Status)) {\r | |
140 | DEBUG ((EFI_D_VERBOSE, " Status = %r\n", Status));\r | |
141 | return Status;\r | |
142 | }\r | |
143 | }\r | |
144 | \r | |
145 | DEBUG ((EFI_D_VERBOSE, " Status = %r\n", Status));\r | |
146 | return Status;\r | |
147 | }\r | |
148 | \r | |
149 | /**\r | |
150 | This service requests use TPM12.\r | |
151 | \r | |
152 | @retval EFI_SUCCESS Get the control of TPM12 chip.\r | |
153 | @retval EFI_NOT_FOUND TPM12 not found.\r | |
154 | @retval EFI_DEVICE_ERROR Unexpected device behavior.\r | |
155 | **/\r | |
156 | EFI_STATUS\r | |
157 | EFIAPI\r | |
158 | Tpm12RequestUseTpm (\r | |
159 | VOID\r | |
160 | )\r | |
161 | {\r | |
162 | EFI_STATUS Status;\r | |
163 | UINT8 Data;\r | |
164 | UINT64 Current;\r | |
165 | UINT64 Previous;\r | |
166 | UINT64 Total;\r | |
167 | UINT64 Start;\r | |
168 | UINT64 End;\r | |
169 | UINT64 Timeout;\r | |
170 | INT64 Cycle;\r | |
171 | INT64 Delta;\r | |
172 | \r | |
173 | //\r | |
174 | // Get the current timer value\r | |
175 | //\r | |
176 | Current = GetPerformanceCounter();\r | |
177 | \r | |
178 | //\r | |
179 | // Initialize local variables\r | |
180 | //\r | |
181 | Start = 0;\r | |
182 | End = 0;\r | |
183 | Total = 0;\r | |
184 | \r | |
185 | //\r | |
186 | // Retrieve the performance counter properties and compute the number of\r | |
187 | // performance counter ticks required to reach the maximum TIS timeout of\r | |
188 | // TIS_TIMEOUT_A. TIS_TIMEOUT_A is in microseconds.\r | |
189 | //\r | |
190 | Timeout = DivU64x32 (\r | |
191 | MultU64x32 (\r | |
192 | GetPerformanceCounterProperties (&Start, &End),\r | |
193 | TIS_TIMEOUT_A\r | |
194 | ),\r | |
195 | 1000000\r | |
196 | );\r | |
197 | Cycle = End - Start;\r | |
198 | if (Cycle < 0) {\r | |
199 | Cycle = -Cycle;\r | |
200 | }\r | |
201 | Cycle++;\r | |
202 | \r | |
203 | //\r | |
204 | // Attempt to read a byte from the Atmel I2C TPM\r | |
205 | //\r | |
206 | do {\r | |
207 | Status = ReadTpmBufferMultiple (&Data, sizeof(Data));\r | |
208 | \r | |
209 | Previous = Current;\r | |
210 | Current = GetPerformanceCounter();\r | |
211 | Delta = (INT64) (Current - Previous);\r | |
212 | if (Start > End) {\r | |
213 | Delta = -Delta;\r | |
214 | }\r | |
215 | if (Delta < 0) {\r | |
216 | Delta += Cycle;\r | |
217 | }\r | |
218 | Total += Delta;\r | |
219 | if (Total >= Timeout) {\r | |
220 | Status = EFI_TIMEOUT;\r | |
221 | DEBUG ((EFI_D_ERROR, "Atmel I2C TPM failed to read: %r\n", Status));\r | |
222 | return Status;\r | |
223 | }\r | |
224 | } while (EFI_ERROR (Status));\r | |
225 | \r | |
226 | return EFI_SUCCESS;\r | |
227 | }\r | |
228 | \r | |
229 | /**\r | |
230 | This service enables the sending of commands to the TPM12.\r | |
231 | \r | |
232 | @param[in] InputParameterBlockSize Size of the TPM12 input parameter block.\r | |
233 | @param[in] InputParameterBlock Pointer to the TPM12 input parameter block.\r | |
234 | @param[in,out] OutputParameterBlockSize Size of the TPM12 output parameter block.\r | |
235 | @param[in] OutputParameterBlock Pointer to the TPM12 output parameter block.\r | |
236 | \r | |
237 | @retval EFI_SUCCESS The command byte stream was successfully sent to\r | |
238 | the device and a response was successfully received.\r | |
239 | @retval EFI_DEVICE_ERROR The command was not successfully sent to the\r | |
240 | device or a response was not successfully received\r | |
241 | from the device.\r | |
242 | @retval EFI_BUFFER_TOO_SMALL The output parameter block is too small.\r | |
243 | **/\r | |
244 | EFI_STATUS\r | |
245 | EFIAPI\r | |
246 | Tpm12SubmitCommand (\r | |
247 | IN UINT32 InputParameterBlockSize,\r | |
248 | IN UINT8 *InputParameterBlock,\r | |
249 | IN OUT UINT32 *OutputParameterBlockSize,\r | |
250 | IN UINT8 *OutputParameterBlock\r | |
251 | )\r | |
252 | {\r | |
253 | EFI_STATUS Status;\r | |
254 | UINT32 TpmOutSize;\r | |
255 | TPM_RSP_COMMAND_HDR *ResponseHeader;\r | |
256 | UINT64 Current;\r | |
257 | UINT64 Previous;\r | |
258 | UINT64 Total;\r | |
259 | UINT64 Start;\r | |
260 | UINT64 End;\r | |
261 | UINT64 Timeout;\r | |
262 | INT64 Cycle;\r | |
263 | INT64 Delta;\r | |
264 | \r | |
265 | //\r | |
266 | // Make sure response buffer is big enough to hold a response header\r | |
267 | //\r | |
268 | if (*OutputParameterBlockSize < sizeof (TPM_RSP_COMMAND_HDR)) {\r | |
269 | Status = EFI_BUFFER_TOO_SMALL;\r | |
270 | goto Done;\r | |
271 | }\r | |
272 | \r | |
273 | //\r | |
274 | // Get the current timer value\r | |
275 | //\r | |
276 | Current = GetPerformanceCounter();\r | |
277 | \r | |
278 | //\r | |
279 | // Initialize local variables\r | |
280 | //\r | |
281 | Start = 0;\r | |
282 | End = 0;\r | |
283 | Total = 0;\r | |
284 | \r | |
285 | //\r | |
286 | // Retrieve the performance counter properties and compute the number of\r | |
287 | // performance counter ticks required to reach the maximum TIS timeout of\r | |
288 | // TIS_TIMEOUT_A. TIS_TIMEOUT_A is in microseconds.\r | |
289 | //\r | |
290 | Timeout = DivU64x32 (\r | |
291 | MultU64x32 (\r | |
292 | GetPerformanceCounterProperties (&Start, &End),\r | |
293 | TIS_TIMEOUT_A\r | |
294 | ),\r | |
295 | 1000000\r | |
296 | );\r | |
297 | Cycle = End - Start;\r | |
298 | if (Cycle < 0) {\r | |
299 | Cycle = -Cycle;\r | |
300 | }\r | |
301 | Cycle++;\r | |
302 | \r | |
303 | //\r | |
304 | // Send command\r | |
305 | //\r | |
306 | do {\r | |
307 | Status = WriteTpmBufferMultiple (InputParameterBlock, InputParameterBlockSize);\r | |
308 | \r | |
309 | Previous = Current;\r | |
310 | Current = GetPerformanceCounter();\r | |
311 | Delta = (INT64) (Current - Previous);\r | |
312 | if (Start > End) {\r | |
313 | Delta = -Delta;\r | |
314 | }\r | |
315 | if (Delta < 0) {\r | |
316 | Delta += Cycle;\r | |
317 | }\r | |
318 | Total += Delta;\r | |
319 | if (Total >= Timeout) {\r | |
320 | Status = EFI_TIMEOUT;\r | |
321 | goto Done;\r | |
322 | }\r | |
323 | } while (EFI_ERROR (Status));\r | |
324 | \r | |
325 | //\r | |
326 | // Receive response header\r | |
327 | //\r | |
328 | do {\r | |
329 | Status = ReadTpmBufferMultiple (OutputParameterBlock, sizeof (TPM_RSP_COMMAND_HDR));\r | |
330 | \r | |
331 | Previous = Current;\r | |
332 | Current = GetPerformanceCounter();\r | |
333 | Delta = (INT64) (Current - Previous);\r | |
334 | if (Start > End) {\r | |
335 | Delta = -Delta;\r | |
336 | }\r | |
337 | if (Delta < 0) {\r | |
338 | Delta += Cycle;\r | |
339 | }\r | |
340 | Total += Delta;\r | |
341 | if (Total >= Timeout) {\r | |
342 | Status = EFI_TIMEOUT;\r | |
343 | goto Done;\r | |
344 | }\r | |
345 | } while (EFI_ERROR (Status));\r | |
346 | \r | |
347 | //\r | |
348 | // Check the response data header (tag, parasize and returncode)\r | |
349 | //\r | |
350 | ResponseHeader = (TPM_RSP_COMMAND_HDR *)OutputParameterBlock;\r | |
351 | if (SwapBytes16 (ReadUnaligned16 (&ResponseHeader->tag)) != TPM_TAG_RSP_COMMAND) {\r | |
352 | Status = EFI_DEVICE_ERROR;\r | |
353 | goto Done;\r | |
354 | }\r | |
355 | \r | |
356 | TpmOutSize = SwapBytes32 (ReadUnaligned32 (&ResponseHeader->paramSize));\r | |
357 | if (TpmOutSize == sizeof (TPM_RSP_COMMAND_HDR)) {\r | |
358 | *OutputParameterBlockSize = TpmOutSize;\r | |
359 | Status = EFI_SUCCESS;\r | |
360 | goto Done;\r | |
361 | }\r | |
362 | if (TpmOutSize < sizeof (TPM_RSP_COMMAND_HDR)) {\r | |
363 | Status = EFI_DEVICE_ERROR;\r | |
364 | goto Done;\r | |
365 | }\r | |
366 | if (*OutputParameterBlockSize < TpmOutSize) {\r | |
367 | Status = EFI_BUFFER_TOO_SMALL;\r | |
368 | goto Done;\r | |
369 | }\r | |
370 | *OutputParameterBlockSize = TpmOutSize;\r | |
371 | \r | |
372 | //\r | |
373 | // Receive the remaining data in the response header\r | |
374 | //\r | |
375 | do {\r | |
376 | Status = ReadTpmBufferMultiple (\r | |
377 | OutputParameterBlock + sizeof (TPM_RSP_COMMAND_HDR),\r | |
378 | TpmOutSize - sizeof (TPM_RSP_COMMAND_HDR)\r | |
379 | );\r | |
380 | \r | |
381 | Previous = Current;\r | |
382 | Current = GetPerformanceCounter();\r | |
383 | Delta = (INT64) (Current - Previous);\r | |
384 | if (Start > End) {\r | |
385 | Delta = -Delta;\r | |
386 | }\r | |
387 | if (Delta < 0) {\r | |
388 | Delta += Cycle;\r | |
389 | }\r | |
390 | Total += Delta;\r | |
391 | if (Total >= Timeout) {\r | |
392 | Status = EFI_TIMEOUT;\r | |
393 | goto Done;\r | |
394 | }\r | |
395 | } while (EFI_ERROR (Status));\r | |
396 | \r | |
397 | Done:\r | |
398 | DEBUG ((\r | |
399 | EFI_D_VERBOSE,\r | |
400 | "Tpm12SubmitCommand() Status = %r Time = %ld ms\n",\r | |
401 | Status,\r | |
402 | DivU64x64Remainder (\r | |
403 | MultU64x32 (Total, 1000),\r | |
404 | GetPerformanceCounterProperties (NULL, NULL),\r | |
405 | NULL\r | |
406 | )\r | |
407 | ));\r | |
408 | \r | |
409 | return Status;\r | |
410 | }\r |