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1 | /** @file\r | |
2 | \r | |
3 | Copyright (c) 2017-2018, Arm Limited. All rights reserved.\r | |
4 | \r | |
5 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
6 | \r | |
7 | System Control and Management Interface V1.0\r | |
8 | http://infocenter.arm.com/help/topic/com.arm.doc.den0056a/\r | |
9 | DEN0056A_System_Control_and_Management_Interface.pdf\r | |
10 | **/\r | |
11 | \r | |
12 | #include <Library/BaseLib.h>\r | |
13 | #include <Library/DebugLib.h>\r | |
14 | #include <Library/UefiBootServicesTableLib.h>\r | |
15 | #include <Protocol/ArmScmiClockProtocol.h>\r | |
16 | #include <Protocol/ArmScmiClock2Protocol.h>\r | |
17 | \r | |
18 | #include "ArmScmiClockProtocolPrivate.h"\r | |
19 | #include "ScmiPrivate.h"\r | |
20 | \r | |
21 | /** Convert to 64 bit value from two 32 bit words.\r | |
22 | \r | |
23 | @param[in] Low Lower 32 bits.\r | |
24 | @param[in] High Higher 32 bits.\r | |
25 | \r | |
26 | @retval UINT64 64 bit value.\r | |
27 | **/\r | |
28 | STATIC\r | |
29 | UINT64\r | |
30 | ConvertTo64Bit (\r | |
31 | IN UINT32 Low,\r | |
32 | IN UINT32 High\r | |
33 | )\r | |
34 | {\r | |
35 | return (Low | ((UINT64)High << 32));\r | |
36 | }\r | |
37 | \r | |
38 | /** Return version of the clock management protocol supported by SCP firmware.\r | |
39 | \r | |
40 | @param[in] This A Pointer to SCMI_CLOCK_PROTOCOL Instance.\r | |
41 | \r | |
42 | @param[out] Version Version of the supported SCMI Clock management protocol.\r | |
43 | \r | |
44 | @retval EFI_SUCCESS The version is returned.\r | |
45 | @retval EFI_DEVICE_ERROR SCP returns an SCMI error.\r | |
46 | @retval !(EFI_SUCCESS) Other errors.\r | |
47 | **/\r | |
48 | STATIC\r | |
49 | EFI_STATUS\r | |
50 | ClockGetVersion (\r | |
51 | IN SCMI_CLOCK_PROTOCOL *This,\r | |
52 | OUT UINT32 *Version\r | |
53 | )\r | |
54 | {\r | |
55 | return ScmiGetProtocolVersion (SCMI_PROTOCOL_ID_CLOCK, Version);\r | |
56 | }\r | |
57 | \r | |
58 | /** Return total number of clock devices supported by the clock management\r | |
59 | protocol.\r | |
60 | \r | |
61 | @param[in] This A Pointer to SCMI_CLOCK_PROTOCOL Instance.\r | |
62 | \r | |
63 | @param[out] TotalClocks Total number of clocks supported.\r | |
64 | \r | |
65 | @retval EFI_SUCCESS Total number of clocks supported is returned.\r | |
66 | @retval EFI_DEVICE_ERROR SCP returns an SCMI error.\r | |
67 | @retval !(EFI_SUCCESS) Other errors.\r | |
68 | **/\r | |
69 | STATIC\r | |
70 | EFI_STATUS\r | |
71 | ClockGetTotalClocks (\r | |
72 | IN SCMI_CLOCK_PROTOCOL *This,\r | |
73 | OUT UINT32 *TotalClocks\r | |
74 | )\r | |
75 | {\r | |
76 | EFI_STATUS Status;\r | |
77 | UINT32 *ReturnValues;\r | |
78 | \r | |
79 | Status = ScmiGetProtocolAttributes (SCMI_PROTOCOL_ID_CLOCK, &ReturnValues);\r | |
80 | if (EFI_ERROR (Status)) {\r | |
81 | return Status;\r | |
82 | }\r | |
83 | \r | |
84 | *TotalClocks = SCMI_CLOCK_PROTOCOL_TOTAL_CLKS (ReturnValues[0]);\r | |
85 | \r | |
86 | return EFI_SUCCESS;\r | |
87 | }\r | |
88 | \r | |
89 | /** Return attributes of a clock device.\r | |
90 | \r | |
91 | @param[in] This A Pointer to SCMI_CLOCK_PROTOCOL Instance.\r | |
92 | @param[in] ClockId Identifier for the clock device.\r | |
93 | \r | |
94 | @param[out] Enabled If TRUE, the clock device is enabled.\r | |
95 | @param[out] ClockAsciiName A NULL terminated ASCII string with the clock\r | |
96 | name, of up to 16 bytes.\r | |
97 | \r | |
98 | @retval EFI_SUCCESS Clock device attributes are returned.\r | |
99 | @retval EFI_DEVICE_ERROR SCP returns an SCMI error.\r | |
100 | @retval !(EFI_SUCCESS) Other errors.\r | |
101 | **/\r | |
102 | STATIC\r | |
103 | EFI_STATUS\r | |
104 | ClockGetClockAttributes (\r | |
105 | IN SCMI_CLOCK_PROTOCOL *This,\r | |
106 | IN UINT32 ClockId,\r | |
107 | OUT BOOLEAN *Enabled,\r | |
108 | OUT CHAR8 *ClockAsciiName\r | |
109 | )\r | |
110 | {\r | |
111 | EFI_STATUS Status;\r | |
112 | \r | |
113 | UINT32 *MessageParams;\r | |
114 | CLOCK_ATTRIBUTES *ClockAttributes;\r | |
115 | SCMI_COMMAND Cmd;\r | |
116 | UINT32 PayloadLength;\r | |
117 | \r | |
118 | Status = ScmiCommandGetPayload (&MessageParams);\r | |
119 | if (EFI_ERROR (Status)) {\r | |
120 | return Status;\r | |
121 | }\r | |
122 | \r | |
123 | *MessageParams = ClockId;\r | |
124 | \r | |
125 | Cmd.ProtocolId = SCMI_PROTOCOL_ID_CLOCK;\r | |
126 | Cmd.MessageId = SCMI_MESSAGE_ID_CLOCK_ATTRIBUTES;\r | |
127 | \r | |
128 | PayloadLength = sizeof (ClockId);\r | |
129 | \r | |
130 | Status = ScmiCommandExecute (\r | |
131 | &Cmd,\r | |
132 | &PayloadLength,\r | |
133 | (UINT32**)&ClockAttributes\r | |
134 | );\r | |
135 | if (EFI_ERROR (Status)) {\r | |
136 | return Status;\r | |
137 | }\r | |
138 | // TRUE if bit 0 of ClockAttributes->Attributes is set.\r | |
139 | *Enabled = CLOCK_ENABLED (ClockAttributes->Attributes);\r | |
140 | \r | |
141 | AsciiStrCpyS (\r | |
142 | ClockAsciiName,\r | |
143 | SCMI_MAX_STR_LEN,\r | |
144 | (CONST CHAR8*)ClockAttributes->ClockName\r | |
145 | );\r | |
146 | \r | |
147 | return EFI_SUCCESS;\r | |
148 | }\r | |
149 | \r | |
150 | /** Return list of rates supported by a given clock device.\r | |
151 | \r | |
152 | @param[in] This A pointer to SCMI_CLOCK_PROTOCOL Instance.\r | |
153 | @param[in] ClockId Identifier for the clock device.\r | |
154 | \r | |
155 | @param[out] Format SCMI_CLOCK_RATE_FORMAT_DISCRETE: Clock device\r | |
156 | supports range of clock rates which are non-linear.\r | |
157 | \r | |
158 | SCMI_CLOCK_RATE_FORMAT_LINEAR: Clock device supports\r | |
159 | range of linear clock rates from Min to Max in steps.\r | |
160 | \r | |
161 | @param[out] TotalRates Total number of rates.\r | |
162 | \r | |
163 | @param[in,out] RateArraySize Size of the RateArray.\r | |
164 | \r | |
165 | @param[out] RateArray List of clock rates.\r | |
166 | \r | |
167 | @retval EFI_SUCCESS List of clock rates is returned.\r | |
168 | @retval EFI_DEVICE_ERROR SCP returns an SCMI error.\r | |
169 | @retval EFI_BUFFER_TOO_SMALL RateArraySize is too small for the result.\r | |
170 | It has been updated to the size needed.\r | |
171 | @retval !(EFI_SUCCESS) Other errors.\r | |
172 | **/\r | |
173 | STATIC\r | |
174 | EFI_STATUS\r | |
175 | ClockDescribeRates (\r | |
176 | IN SCMI_CLOCK_PROTOCOL *This,\r | |
177 | IN UINT32 ClockId,\r | |
178 | OUT SCMI_CLOCK_RATE_FORMAT *Format,\r | |
179 | OUT UINT32 *TotalRates,\r | |
180 | IN OUT UINT32 *RateArraySize,\r | |
181 | OUT SCMI_CLOCK_RATE *RateArray\r | |
182 | )\r | |
183 | {\r | |
184 | EFI_STATUS Status;\r | |
185 | \r | |
186 | UINT32 PayloadLength;\r | |
187 | SCMI_COMMAND Cmd;\r | |
188 | UINT32 *MessageParams;\r | |
189 | CLOCK_DESCRIBE_RATES *DescribeRates;\r | |
190 | CLOCK_RATE_DWORD *Rate;\r | |
191 | \r | |
192 | UINT32 RequiredArraySize = 0;\r | |
193 | UINT32 RateIndex = 0;\r | |
194 | UINT32 RateNo;\r | |
195 | UINT32 RateOffset;\r | |
196 | \r | |
197 | *TotalRates = 0;\r | |
198 | \r | |
199 | Status = ScmiCommandGetPayload (&MessageParams);\r | |
200 | if (EFI_ERROR (Status)) {\r | |
201 | return Status;\r | |
202 | }\r | |
203 | \r | |
204 | Cmd.ProtocolId = SCMI_PROTOCOL_ID_CLOCK;\r | |
205 | Cmd.MessageId = SCMI_MESSAGE_ID_CLOCK_DESCRIBE_RATES;\r | |
206 | \r | |
207 | *MessageParams++ = ClockId;\r | |
208 | \r | |
209 | do {\r | |
210 | \r | |
211 | *MessageParams = RateIndex;\r | |
212 | \r | |
213 | // Set Payload length, note PayloadLength is a IN/OUT parameter.\r | |
214 | PayloadLength = sizeof (ClockId) + sizeof (RateIndex);\r | |
215 | \r | |
216 | // Execute and wait for response on a SCMI channel.\r | |
217 | Status = ScmiCommandExecute (\r | |
218 | &Cmd,\r | |
219 | &PayloadLength,\r | |
220 | (UINT32**)&DescribeRates\r | |
221 | );\r | |
222 | if (EFI_ERROR (Status)) {\r | |
223 | return Status;\r | |
224 | }\r | |
225 | \r | |
226 | if (*TotalRates == 0) {\r | |
227 | // In the first iteration we will get number of returned rates and number\r | |
228 | // of remaining rates. With this information calculate required size\r | |
229 | // for rate array. If provided RateArraySize is less, return an\r | |
230 | // error.\r | |
231 | \r | |
232 | *Format = RATE_FORMAT (DescribeRates->NumRatesFlags);\r | |
233 | \r | |
234 | *TotalRates = NUM_RATES (DescribeRates->NumRatesFlags)\r | |
235 | + NUM_REMAIN_RATES (DescribeRates->NumRatesFlags);\r | |
236 | \r | |
237 | if (*Format == SCMI_CLOCK_RATE_FORMAT_DISCRETE) {\r | |
238 | RequiredArraySize = (*TotalRates) * sizeof (UINT64);\r | |
239 | } else {\r | |
240 | // We need to return triplet of 64 bit value for each rate\r | |
241 | RequiredArraySize = (*TotalRates) * 3 * sizeof (UINT64);\r | |
242 | }\r | |
243 | \r | |
244 | if (RequiredArraySize > (*RateArraySize)) {\r | |
245 | *RateArraySize = RequiredArraySize;\r | |
246 | return EFI_BUFFER_TOO_SMALL;\r | |
247 | }\r | |
248 | }\r | |
249 | \r | |
250 | RateOffset = 0;\r | |
251 | \r | |
252 | if (*Format == SCMI_CLOCK_RATE_FORMAT_DISCRETE) {\r | |
253 | for (RateNo = 0; RateNo < NUM_RATES (DescribeRates->NumRatesFlags); RateNo++) {\r | |
254 | Rate = &DescribeRates->Rates[RateOffset++];\r | |
255 | // Non-linear discrete rates.\r | |
256 | RateArray[RateIndex++].Rate = ConvertTo64Bit (Rate->Low, Rate->High);\r | |
257 | }\r | |
258 | } else {\r | |
259 | for (RateNo = 0; RateNo < NUM_RATES (DescribeRates->NumRatesFlags); RateNo++) {\r | |
260 | // Linear clock rates from minimum to maximum in steps\r | |
261 | // Minimum clock rate.\r | |
262 | Rate = &DescribeRates->Rates[RateOffset++];\r | |
263 | RateArray[RateIndex].Min = ConvertTo64Bit (Rate->Low, Rate->High);\r | |
264 | \r | |
265 | Rate = &DescribeRates->Rates[RateOffset++];\r | |
266 | // Maximum clock rate.\r | |
267 | RateArray[RateIndex].Max = ConvertTo64Bit (Rate->Low, Rate->High);\r | |
268 | \r | |
269 | Rate = &DescribeRates->Rates[RateOffset++];\r | |
270 | // Step.\r | |
271 | RateArray[RateIndex++].Step = ConvertTo64Bit (Rate->Low, Rate->High);\r | |
272 | }\r | |
273 | }\r | |
274 | } while (NUM_REMAIN_RATES (DescribeRates->NumRatesFlags) != 0);\r | |
275 | \r | |
276 | // Update RateArraySize with RequiredArraySize.\r | |
277 | *RateArraySize = RequiredArraySize;\r | |
278 | \r | |
279 | return EFI_SUCCESS;\r | |
280 | }\r | |
281 | \r | |
282 | /** Get clock rate.\r | |
283 | \r | |
284 | @param[in] This A Pointer to SCMI_CLOCK_PROTOCOL Instance.\r | |
285 | @param[in] ClockId Identifier for the clock device.\r | |
286 | \r | |
287 | @param[out] Rate Clock rate.\r | |
288 | \r | |
289 | @retval EFI_SUCCESS Clock rate is returned.\r | |
290 | @retval EFI_DEVICE_ERROR SCP returns an SCMI error.\r | |
291 | @retval !(EFI_SUCCESS) Other errors.\r | |
292 | **/\r | |
293 | STATIC\r | |
294 | EFI_STATUS\r | |
295 | ClockRateGet (\r | |
296 | IN SCMI_CLOCK_PROTOCOL *This,\r | |
297 | IN UINT32 ClockId,\r | |
298 | OUT UINT64 *Rate\r | |
299 | )\r | |
300 | {\r | |
301 | EFI_STATUS Status;\r | |
302 | \r | |
303 | UINT32 *MessageParams;\r | |
304 | CLOCK_RATE_DWORD *ClockRate;\r | |
305 | SCMI_COMMAND Cmd;\r | |
306 | \r | |
307 | UINT32 PayloadLength;\r | |
308 | \r | |
309 | Status = ScmiCommandGetPayload (&MessageParams);\r | |
310 | if (EFI_ERROR (Status)) {\r | |
311 | return Status;\r | |
312 | }\r | |
313 | \r | |
314 | // Fill arguments for clock protocol command.\r | |
315 | *MessageParams = ClockId;\r | |
316 | \r | |
317 | Cmd.ProtocolId = SCMI_PROTOCOL_ID_CLOCK;\r | |
318 | Cmd.MessageId = SCMI_MESSAGE_ID_CLOCK_RATE_GET;\r | |
319 | \r | |
320 | PayloadLength = sizeof (ClockId);\r | |
321 | \r | |
322 | // Execute and wait for response on a SCMI channel.\r | |
323 | Status = ScmiCommandExecute (\r | |
324 | &Cmd,\r | |
325 | &PayloadLength,\r | |
326 | (UINT32**)&ClockRate\r | |
327 | );\r | |
328 | if (EFI_ERROR (Status)) {\r | |
329 | return Status;\r | |
330 | }\r | |
331 | \r | |
332 | *Rate = ConvertTo64Bit (ClockRate->Low, ClockRate->High);\r | |
333 | \r | |
334 | return EFI_SUCCESS;\r | |
335 | }\r | |
336 | \r | |
337 | /** Set clock rate.\r | |
338 | \r | |
339 | @param[in] This A Pointer to SCMI_CLOCK_PROTOCOL Instance.\r | |
340 | @param[in] ClockId Identifier for the clock device.\r | |
341 | @param[in] Rate Clock rate.\r | |
342 | \r | |
343 | @retval EFI_SUCCESS Clock rate set success.\r | |
344 | @retval EFI_DEVICE_ERROR SCP returns an SCMI error.\r | |
345 | @retval !(EFI_SUCCESS) Other errors.\r | |
346 | **/\r | |
347 | STATIC\r | |
348 | EFI_STATUS\r | |
349 | ClockRateSet (\r | |
350 | IN SCMI_CLOCK_PROTOCOL *This,\r | |
351 | IN UINT32 ClockId,\r | |
352 | IN UINT64 Rate\r | |
353 | )\r | |
354 | {\r | |
355 | EFI_STATUS Status;\r | |
356 | CLOCK_RATE_SET_ATTRIBUTES *ClockRateSetAttributes;\r | |
357 | SCMI_COMMAND Cmd;\r | |
358 | UINT32 PayloadLength;\r | |
359 | \r | |
360 | Status = ScmiCommandGetPayload ((UINT32**)&ClockRateSetAttributes);\r | |
361 | if (EFI_ERROR (Status)) {\r | |
362 | return Status;\r | |
363 | }\r | |
364 | \r | |
365 | // Fill arguments for clock protocol command.\r | |
366 | ClockRateSetAttributes->ClockId = ClockId;\r | |
367 | ClockRateSetAttributes->Flags = CLOCK_SET_DEFAULT_FLAGS;\r | |
368 | ClockRateSetAttributes->Rate.Low = (UINT32)Rate;\r | |
369 | ClockRateSetAttributes->Rate.High = (UINT32)(Rate >> 32);\r | |
370 | \r | |
371 | Cmd.ProtocolId = SCMI_PROTOCOL_ID_CLOCK;\r | |
372 | Cmd.MessageId = SCMI_MESSAGE_ID_CLOCK_RATE_SET;\r | |
373 | \r | |
374 | PayloadLength = sizeof (CLOCK_RATE_SET_ATTRIBUTES);\r | |
375 | \r | |
376 | // Execute and wait for response on a SCMI channel.\r | |
377 | Status = ScmiCommandExecute (\r | |
378 | &Cmd,\r | |
379 | &PayloadLength,\r | |
380 | NULL\r | |
381 | );\r | |
382 | \r | |
383 | return Status;\r | |
384 | }\r | |
385 | \r | |
386 | /** Enable/Disable specified clock.\r | |
387 | \r | |
388 | @param[in] This A Pointer to SCMI_CLOCK_PROTOCOL Instance.\r | |
389 | @param[in] ClockId Identifier for the clock device.\r | |
390 | @param[in] Enable TRUE to enable, FALSE to disable.\r | |
391 | \r | |
392 | @retval EFI_SUCCESS Clock enable/disable successful.\r | |
393 | @retval EFI_DEVICE_ERROR SCP returns an SCMI error.\r | |
394 | @retval !(EFI_SUCCESS) Other errors.\r | |
395 | **/\r | |
396 | STATIC\r | |
397 | EFI_STATUS\r | |
398 | ClockEnable (\r | |
399 | IN SCMI_CLOCK2_PROTOCOL *This,\r | |
400 | IN UINT32 ClockId,\r | |
401 | IN BOOLEAN Enable\r | |
402 | )\r | |
403 | {\r | |
404 | EFI_STATUS Status;\r | |
405 | CLOCK_CONFIG_SET_ATTRIBUTES *ClockConfigSetAttributes;\r | |
406 | SCMI_COMMAND Cmd;\r | |
407 | UINT32 PayloadLength;\r | |
408 | \r | |
409 | Status = ScmiCommandGetPayload ((UINT32**)&ClockConfigSetAttributes);\r | |
410 | if (EFI_ERROR (Status)) {\r | |
411 | return Status;\r | |
412 | }\r | |
413 | \r | |
414 | // Fill arguments for clock protocol command.\r | |
415 | ClockConfigSetAttributes->ClockId = ClockId;\r | |
416 | ClockConfigSetAttributes->Attributes = Enable ? BIT0 : 0;\r | |
417 | \r | |
418 | Cmd.ProtocolId = SCMI_PROTOCOL_ID_CLOCK;\r | |
419 | Cmd.MessageId = SCMI_MESSAGE_ID_CLOCK_CONFIG_SET;\r | |
420 | \r | |
421 | PayloadLength = sizeof (CLOCK_CONFIG_SET_ATTRIBUTES);\r | |
422 | \r | |
423 | // Execute and wait for response on a SCMI channel.\r | |
424 | Status = ScmiCommandExecute (\r | |
425 | &Cmd,\r | |
426 | &PayloadLength,\r | |
427 | NULL\r | |
428 | );\r | |
429 | \r | |
430 | return Status;\r | |
431 | }\r | |
432 | \r | |
433 | // Instance of the SCMI clock management protocol.\r | |
434 | STATIC CONST SCMI_CLOCK_PROTOCOL ScmiClockProtocol = {\r | |
435 | ClockGetVersion,\r | |
436 | ClockGetTotalClocks,\r | |
437 | ClockGetClockAttributes,\r | |
438 | ClockDescribeRates,\r | |
439 | ClockRateGet,\r | |
440 | ClockRateSet\r | |
441 | };\r | |
442 | \r | |
443 | // Instance of the SCMI clock management protocol.\r | |
444 | STATIC CONST SCMI_CLOCK2_PROTOCOL ScmiClock2Protocol = {\r | |
445 | (SCMI_CLOCK2_GET_VERSION)ClockGetVersion,\r | |
446 | (SCMI_CLOCK2_GET_TOTAL_CLOCKS)ClockGetTotalClocks,\r | |
447 | (SCMI_CLOCK2_GET_CLOCK_ATTRIBUTES)ClockGetClockAttributes,\r | |
448 | (SCMI_CLOCK2_DESCRIBE_RATES)ClockDescribeRates,\r | |
449 | (SCMI_CLOCK2_RATE_GET)ClockRateGet,\r | |
450 | (SCMI_CLOCK2_RATE_SET)ClockRateSet,\r | |
451 | SCMI_CLOCK2_PROTOCOL_VERSION,\r | |
452 | ClockEnable\r | |
453 | };\r | |
454 | \r | |
455 | /** Initialize clock management protocol and install protocol on a given handle.\r | |
456 | \r | |
457 | @param[in] Handle Handle to install clock management protocol.\r | |
458 | \r | |
459 | @retval EFI_SUCCESS Clock protocol interface installed successfully.\r | |
460 | **/\r | |
461 | EFI_STATUS\r | |
462 | ScmiClockProtocolInit (\r | |
463 | IN EFI_HANDLE* Handle\r | |
464 | )\r | |
465 | {\r | |
466 | return gBS->InstallMultipleProtocolInterfaces (\r | |
467 | Handle,\r | |
468 | &gArmScmiClockProtocolGuid,\r | |
469 | &ScmiClockProtocol,\r | |
470 | &gArmScmiClock2ProtocolGuid,\r | |
471 | &ScmiClock2Protocol,\r | |
472 | NULL\r | |
473 | );\r | |
474 | }\r |