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49ba9447 | 1 | /** @file\r |
2 | ACPI Timer implements one instance of Timer Library.\r | |
3 | \r | |
d3a24ff5 | 4 | Copyright (c) 2008 - 2012, Intel Corporation. All rights reserved.<BR>\r |
550486ed | 5 | Copyright (c) 2011, Andrei Warkentin <andreiw@motorola.com>\r |
6 | \r | |
56d7640a | 7 | This program and the accompanying materials are\r |
49ba9447 | 8 | licensed and made available under the terms and conditions of the BSD License\r |
9 | which accompanies this distribution. The full text of the license may be found at\r | |
10 | http://opensource.org/licenses/bsd-license.php\r | |
67164dcd | 11 | \r |
49ba9447 | 12 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
13 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r | |
14 | \r | |
67164dcd | 15 | **/\r |
49ba9447 | 16 | \r |
17 | #include <Base.h>\r | |
18 | #include <Library/TimerLib.h>\r | |
19 | #include <Library/BaseLib.h>\r | |
20 | #include <Library/IoLib.h>\r | |
21 | #include <Library/PciLib.h>\r | |
550486ed | 22 | #include <Library/DebugLib.h>\r |
830067bf | 23 | #include <Library/PcdLib.h>\r |
5a624588 | 24 | #include <IndustryStandard/Pci22.h>\r |
d3a24ff5 | 25 | #include <IndustryStandard/Acpi.h>\r |
550486ed | 26 | \r |
27 | //\r | |
d3a24ff5 | 28 | // PCI Location of PIIX4 Power Management PCI Configuration Registers\r |
550486ed | 29 | //\r |
d3a24ff5 | 30 | #define PIIX4_POWER_MANAGEMENT_BUS 0x00\r |
31 | #define PIIX4_POWER_MANAGEMENT_DEVICE 0x01\r | |
32 | #define PIIX4_POWER_MANAGEMENT_FUNCTION 0x03\r | |
49ba9447 | 33 | \r |
d3a24ff5 | 34 | //\r |
35 | // Macro to access PIIX4 Power Management PCI Configuration Registers\r | |
36 | //\r | |
37 | #define PIIX4_PCI_POWER_MANAGEMENT_REGISTER(Register) \\r | |
38 | PCI_LIB_ADDRESS ( \\r | |
39 | PIIX4_POWER_MANAGEMENT_BUS, \\r | |
40 | PIIX4_POWER_MANAGEMENT_DEVICE, \\r | |
41 | PIIX4_POWER_MANAGEMENT_FUNCTION, \\r | |
42 | Register \\r | |
43 | )\r | |
44 | \r | |
45 | //\r | |
46 | // PIIX4 Power Management PCI Configuration Registers\r | |
47 | //\r | |
48 | #define PMBA PIIX4_PCI_POWER_MANAGEMENT_REGISTER (0x40)\r | |
49 | #define PMBA_RTE BIT0\r | |
50 | #define PMREGMISC PIIX4_PCI_POWER_MANAGEMENT_REGISTER (0x80)\r | |
51 | #define PMIOSE BIT0\r | |
52 | \r | |
53 | //\r | |
54 | // The ACPI Time in the PIIX4 is a 24-bit counter\r | |
55 | //\r | |
56 | #define ACPI_TIMER_COUNT_SIZE BIT24\r | |
57 | \r | |
58 | //\r | |
59 | // Offset in the PIIX4 Power Management Base Address to the ACPI Timer \r | |
60 | //\r | |
550486ed | 61 | #define ACPI_TIMER_OFFSET 0x8\r |
49ba9447 | 62 | \r |
63 | /**\r | |
64 | The constructor function enables ACPI IO space.\r | |
65 | \r | |
66 | If ACPI I/O space not enabled, this function will enable it.\r | |
67 | It will always return RETURN_SUCCESS.\r | |
68 | \r | |
69 | @retval EFI_SUCCESS The constructor always returns RETURN_SUCCESS.\r | |
70 | \r | |
71 | **/\r | |
72 | RETURN_STATUS\r | |
73 | EFIAPI\r | |
74 | AcpiTimerLibConstructor (\r | |
75 | VOID\r | |
76 | )\r | |
77 | {\r | |
49ba9447 | 78 | //\r |
d3a24ff5 | 79 | // Check to see if the PIIX4 Power Management Base Address is already enabled\r |
49ba9447 | 80 | //\r |
d3a24ff5 | 81 | if ((PciRead8 (PMREGMISC) & PMIOSE) == 0) {\r |
82 | //\r | |
83 | // If the PIIX4 Power Management Base Address is not programmed, \r | |
84 | // then program the PIIX4 Power Management Base Address from a PCD.\r | |
85 | //\r | |
86 | PciAndThenOr32 (PMBA, (UINT32)(~0x0000FFC0), PcdGet16 (PcdAcpiPmBaseAddress));\r | |
87 | \r | |
88 | //\r | |
89 | // Enable PMBA I/O port decodes in PMREGMISC\r | |
90 | //\r | |
91 | PciOr8 (PMREGMISC, PMIOSE);\r | |
92 | }\r | |
93 | \r | |
550486ed | 94 | return RETURN_SUCCESS;\r |
49ba9447 | 95 | }\r |
96 | \r | |
97 | /**\r | |
98 | Internal function to read the current tick counter of ACPI.\r | |
99 | \r | |
100 | Internal function to read the current tick counter of ACPI.\r | |
101 | \r | |
102 | @return The tick counter read.\r | |
103 | \r | |
104 | **/\r | |
49ba9447 | 105 | UINT32\r |
106 | InternalAcpiGetTimerTick (\r | |
107 | VOID\r | |
108 | )\r | |
109 | {\r | |
d3a24ff5 | 110 | //\r |
111 | // Read PMBA to read and return the current ACPI timer value.\r | |
112 | //\r | |
113 | return IoRead32 ((PciRead32 (PMBA) & ~PMBA_RTE) + ACPI_TIMER_OFFSET);\r | |
49ba9447 | 114 | }\r |
115 | \r | |
116 | /**\r | |
117 | Stalls the CPU for at least the given number of ticks.\r | |
118 | \r | |
119 | Stalls the CPU for at least the given number of ticks. It's invoked by\r | |
120 | MicroSecondDelay() and NanoSecondDelay().\r | |
121 | \r | |
122 | @param Delay A period of time to delay in ticks.\r | |
123 | \r | |
124 | **/\r | |
49ba9447 | 125 | VOID\r |
126 | InternalAcpiDelay (\r | |
127 | IN UINT32 Delay\r | |
128 | )\r | |
129 | {\r | |
130 | UINT32 Ticks;\r | |
131 | UINT32 Times;\r | |
132 | \r | |
133 | Times = Delay >> 22;\r | |
134 | Delay &= BIT22 - 1;\r | |
135 | do {\r | |
136 | //\r | |
137 | // The target timer count is calculated here\r | |
138 | //\r | |
139 | Ticks = InternalAcpiGetTimerTick () + Delay;\r | |
140 | Delay = BIT22;\r | |
141 | //\r | |
142 | // Wait until time out\r | |
143 | // Delay >= 2^23 could not be handled by this function\r | |
144 | // Timer wrap-arounds are handled correctly by this function\r | |
145 | //\r | |
146 | while (((Ticks - InternalAcpiGetTimerTick ()) & BIT23) == 0) {\r | |
147 | CpuPause ();\r | |
148 | }\r | |
149 | } while (Times-- > 0);\r | |
150 | }\r | |
151 | \r | |
152 | /**\r | |
153 | Stalls the CPU for at least the given number of microseconds.\r | |
154 | \r | |
155 | Stalls the CPU for the number of microseconds specified by MicroSeconds.\r | |
156 | \r | |
157 | @param MicroSeconds The minimum number of microseconds to delay.\r | |
158 | \r | |
159 | @return MicroSeconds\r | |
160 | \r | |
161 | **/\r | |
162 | UINTN\r | |
163 | EFIAPI\r | |
164 | MicroSecondDelay (\r | |
165 | IN UINTN MicroSeconds\r | |
166 | )\r | |
167 | {\r | |
168 | InternalAcpiDelay (\r | |
169 | (UINT32)DivU64x32 (\r | |
170 | MultU64x32 (\r | |
171 | MicroSeconds,\r | |
172 | ACPI_TIMER_FREQUENCY\r | |
173 | ),\r | |
174 | 1000000u\r | |
175 | )\r | |
176 | );\r | |
177 | return MicroSeconds;\r | |
178 | }\r | |
179 | \r | |
180 | /**\r | |
181 | Stalls the CPU for at least the given number of nanoseconds.\r | |
182 | \r | |
183 | Stalls the CPU for the number of nanoseconds specified by NanoSeconds.\r | |
184 | \r | |
185 | @param NanoSeconds The minimum number of nanoseconds to delay.\r | |
186 | \r | |
187 | @return NanoSeconds\r | |
188 | \r | |
189 | **/\r | |
190 | UINTN\r | |
191 | EFIAPI\r | |
192 | NanoSecondDelay (\r | |
193 | IN UINTN NanoSeconds\r | |
194 | )\r | |
195 | {\r | |
196 | InternalAcpiDelay (\r | |
197 | (UINT32)DivU64x32 (\r | |
198 | MultU64x32 (\r | |
199 | NanoSeconds,\r | |
200 | ACPI_TIMER_FREQUENCY\r | |
201 | ),\r | |
202 | 1000000000u\r | |
203 | )\r | |
204 | );\r | |
205 | return NanoSeconds;\r | |
206 | }\r | |
207 | \r | |
208 | /**\r | |
209 | Retrieves the current value of a 64-bit free running performance counter.\r | |
210 | \r | |
211 | Retrieves the current value of a 64-bit free running performance counter. The\r | |
212 | counter can either count up by 1 or count down by 1. If the physical\r | |
213 | performance counter counts by a larger increment, then the counter values\r | |
214 | must be translated. The properties of the counter can be retrieved from\r | |
215 | GetPerformanceCounterProperties().\r | |
216 | \r | |
217 | @return The current value of the free running performance counter.\r | |
218 | \r | |
219 | **/\r | |
220 | UINT64\r | |
221 | EFIAPI\r | |
222 | GetPerformanceCounter (\r | |
223 | VOID\r | |
224 | )\r | |
225 | {\r | |
226 | return (UINT64)InternalAcpiGetTimerTick ();\r | |
227 | }\r | |
228 | \r | |
229 | /**\r | |
230 | Retrieves the 64-bit frequency in Hz and the range of performance counter\r | |
231 | values.\r | |
232 | \r | |
233 | If StartValue is not NULL, then the value that the performance counter starts\r | |
234 | with immediately after is it rolls over is returned in StartValue. If\r | |
235 | EndValue is not NULL, then the value that the performance counter end with\r | |
236 | immediately before it rolls over is returned in EndValue. The 64-bit\r | |
237 | frequency of the performance counter in Hz is always returned. If StartValue\r | |
238 | is less than EndValue, then the performance counter counts up. If StartValue\r | |
239 | is greater than EndValue, then the performance counter counts down. For\r | |
240 | example, a 64-bit free running counter that counts up would have a StartValue\r | |
241 | of 0 and an EndValue of 0xFFFFFFFFFFFFFFFF. A 24-bit free running counter\r | |
242 | that counts down would have a StartValue of 0xFFFFFF and an EndValue of 0.\r | |
243 | \r | |
244 | @param StartValue The value the performance counter starts with when it\r | |
245 | rolls over.\r | |
246 | @param EndValue The value that the performance counter ends with before\r | |
247 | it rolls over.\r | |
248 | \r | |
249 | @return The frequency in Hz.\r | |
250 | \r | |
251 | **/\r | |
252 | UINT64\r | |
253 | EFIAPI\r | |
254 | GetPerformanceCounterProperties (\r | |
255 | OUT UINT64 *StartValue, OPTIONAL\r | |
256 | OUT UINT64 *EndValue OPTIONAL\r | |
257 | )\r | |
258 | {\r | |
259 | if (StartValue != NULL) {\r | |
260 | *StartValue = 0;\r | |
261 | }\r | |
262 | \r | |
263 | if (EndValue != NULL) {\r | |
264 | *EndValue = ACPI_TIMER_COUNT_SIZE - 1;\r | |
265 | }\r | |
266 | \r | |
267 | return ACPI_TIMER_FREQUENCY;\r | |
268 | }\r | |
b9610b9c | 269 | \r |
270 | /**\r | |
271 | Converts elapsed ticks of performance counter to time in nanoseconds.\r | |
272 | \r | |
273 | This function converts the elapsed ticks of running performance counter to\r | |
274 | time value in unit of nanoseconds.\r | |
275 | \r | |
276 | @param Ticks The number of elapsed ticks of running performance counter.\r | |
277 | \r | |
278 | @return The elapsed time in nanoseconds.\r | |
279 | \r | |
280 | **/\r | |
281 | UINT64\r | |
282 | EFIAPI\r | |
283 | GetTimeInNanoSecond (\r | |
284 | IN UINT64 Ticks\r | |
285 | )\r | |
286 | {\r | |
287 | UINT64 NanoSeconds;\r | |
288 | UINT32 Remainder;\r | |
289 | \r | |
290 | //\r | |
291 | // Ticks\r | |
292 | // Time = --------- x 1,000,000,000\r | |
293 | // Frequency\r | |
294 | //\r | |
295 | NanoSeconds = MultU64x32 (DivU64x32Remainder (Ticks, ACPI_TIMER_FREQUENCY, &Remainder), 1000000000u);\r | |
296 | \r | |
297 | //\r | |
298 | // Frequency < 0x100000000, so Remainder < 0x100000000, then (Remainder * 1,000,000,000)\r | |
299 | // will not overflow 64-bit.\r | |
300 | //\r | |
301 | NanoSeconds += DivU64x32 (MultU64x32 ((UINT64) Remainder, 1000000000u), ACPI_TIMER_FREQUENCY);\r | |
302 | \r | |
303 | return NanoSeconds;\r | |
304 | }\r |