2 Header file for real time clock driver.
4 Copyright (c) 2006 - 2016, Intel Corporation. All rights reserved.<BR>
5 Copyright (c) 2017, AMD Inc. All rights reserved.<BR>
7 This program and the accompanying materials
8 are licensed and made available under the terms and conditions of the BSD License
9 which accompanies this distribution. The full text of the license may be found at
10 http://opensource.org/licenses/bsd-license.php
12 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
13 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
24 #include <Guid/Acpi.h>
26 #include <Protocol/RealTimeClock.h>
28 #include <Library/BaseLib.h>
29 #include <Library/DebugLib.h>
30 #include <Library/UefiLib.h>
31 #include <Library/BaseMemoryLib.h>
32 #include <Library/IoLib.h>
33 #include <Library/TimerLib.h>
34 #include <Library/UefiDriverEntryPoint.h>
35 #include <Library/UefiBootServicesTableLib.h>
36 #include <Library/UefiRuntimeLib.h>
37 #include <Library/UefiRuntimeServicesTableLib.h>
38 #include <Library/PcdLib.h>
39 #include <Library/ReportStatusCodeLib.h>
45 UINT8 CenturyRtcAddress
;
46 } PC_RTC_MODULE_GLOBALS
;
48 extern PC_RTC_MODULE_GLOBALS mModuleGlobal
;
50 #define PCAT_RTC_ADDRESS_REGISTER 0x70
51 #define PCAT_RTC_DATA_REGISTER 0x71
54 // Dallas DS12C887 Real Time Clock
56 #define RTC_ADDRESS_SECONDS 0 // R/W Range 0..59
57 #define RTC_ADDRESS_SECONDS_ALARM 1 // R/W Range 0..59
58 #define RTC_ADDRESS_MINUTES 2 // R/W Range 0..59
59 #define RTC_ADDRESS_MINUTES_ALARM 3 // R/W Range 0..59
60 #define RTC_ADDRESS_HOURS 4 // R/W Range 1..12 or 0..23 Bit 7 is AM/PM
61 #define RTC_ADDRESS_HOURS_ALARM 5 // R/W Range 1..12 or 0..23 Bit 7 is AM/PM
62 #define RTC_ADDRESS_DAY_OF_THE_WEEK 6 // R/W Range 1..7
63 #define RTC_ADDRESS_DAY_OF_THE_MONTH 7 // R/W Range 1..31
64 #define RTC_ADDRESS_MONTH 8 // R/W Range 1..12
65 #define RTC_ADDRESS_YEAR 9 // R/W Range 0..99
66 #define RTC_ADDRESS_REGISTER_A 10 // R/W[0..6] R0[7]
67 #define RTC_ADDRESS_REGISTER_B 11 // R/W
68 #define RTC_ADDRESS_REGISTER_C 12 // RO
69 #define RTC_ADDRESS_REGISTER_D 13 // RO
71 // Date and time initial values.
72 // They are used if the RTC values are invalid during driver initialization
74 #define RTC_INIT_SECOND 0
75 #define RTC_INIT_MINUTE 0
76 #define RTC_INIT_HOUR 0
77 #define RTC_INIT_DAY 1
78 #define RTC_INIT_MONTH 1
85 UINT8 Rs
: 4; // Rate Selection Bits
86 UINT8 Dv
: 3; // Divisor
87 UINT8 Uip
: 1; // Update in progress
88 } RTC_REGISTER_A_BITS
;
91 RTC_REGISTER_A_BITS Bits
;
99 UINT8 Dse
: 1; // 0 - Daylight saving disabled 1 - Daylight savings enabled
100 UINT8 Mil
: 1; // 0 - 12 hour mode 1 - 24 hour mode
101 UINT8 Dm
: 1; // 0 - BCD Format 1 - Binary Format
102 UINT8 Sqwe
: 1; // 0 - Disable SQWE output 1 - Enable SQWE output
103 UINT8 Uie
: 1; // 0 - Update INT disabled 1 - Update INT enabled
104 UINT8 Aie
: 1; // 0 - Alarm INT disabled 1 - Alarm INT Enabled
105 UINT8 Pie
: 1; // 0 - Periodic INT disabled 1 - Periodic INT Enabled
106 UINT8 Set
: 1; // 0 - Normal operation. 1 - Updates inhibited
107 } RTC_REGISTER_B_BITS
;
110 RTC_REGISTER_B_BITS Bits
;
118 UINT8 Reserved
: 4; // Read as zero. Can not be written.
119 UINT8 Uf
: 1; // Update End Interrupt Flag
120 UINT8 Af
: 1; // Alarm Interrupt Flag
121 UINT8 Pf
: 1; // Periodic Interrupt Flag
122 UINT8 Irqf
: 1; // Iterrupt Request Flag = PF & PIE | AF & AIE | UF & UIE
123 } RTC_REGISTER_C_BITS
;
126 RTC_REGISTER_C_BITS Bits
;
134 UINT8 Reserved
: 7; // Read as zero. Can not be written.
135 UINT8 Vrt
: 1; // Valid RAM and Time
136 } RTC_REGISTER_D_BITS
;
139 RTC_REGISTER_D_BITS Bits
;
148 @param Global For global use inside this module.
150 @retval EFI_DEVICE_ERROR Initialization failed due to device error.
151 @retval EFI_SUCCESS Initialization successful.
156 IN PC_RTC_MODULE_GLOBALS
*Global
160 Sets the current local time and date information.
162 @param Time A pointer to the current time.
163 @param Global For global use inside this module.
165 @retval EFI_SUCCESS The operation completed successfully.
166 @retval EFI_INVALID_PARAMETER A time field is out of range.
167 @retval EFI_DEVICE_ERROR The time could not be set due due to hardware error.
173 IN PC_RTC_MODULE_GLOBALS
*Global
177 Returns the current time and date information, and the time-keeping capabilities
178 of the hardware platform.
180 @param Time A pointer to storage to receive a snapshot of the current time.
181 @param Capabilities An optional pointer to a buffer to receive the real time clock
182 device's capabilities.
183 @param Global For global use inside this module.
185 @retval EFI_SUCCESS The operation completed successfully.
186 @retval EFI_INVALID_PARAMETER Time is NULL.
187 @retval EFI_DEVICE_ERROR The time could not be retrieved due to hardware error.
193 OUT EFI_TIME_CAPABILITIES
*Capabilities
, OPTIONAL
194 IN PC_RTC_MODULE_GLOBALS
*Global
198 Sets the system wakeup alarm clock time.
200 @param Enabled Enable or disable the wakeup alarm.
201 @param Time If Enable is TRUE, the time to set the wakeup alarm for.
202 If Enable is FALSE, then this parameter is optional, and may be NULL.
203 @param Global For global use inside this module.
205 @retval EFI_SUCCESS If Enable is TRUE, then the wakeup alarm was enabled.
206 If Enable is FALSE, then the wakeup alarm was disabled.
207 @retval EFI_INVALID_PARAMETER A time field is out of range.
208 @retval EFI_DEVICE_ERROR The wakeup time could not be set due to a hardware error.
209 @retval EFI_UNSUPPORTED A wakeup timer is not supported on this platform.
215 IN EFI_TIME
*Time
, OPTIONAL
216 IN PC_RTC_MODULE_GLOBALS
*Global
220 Returns the current wakeup alarm clock setting.
222 @param Enabled Indicates if the alarm is currently enabled or disabled.
223 @param Pending Indicates if the alarm signal is pending and requires acknowledgement.
224 @param Time The current alarm setting.
225 @param Global For global use inside this module.
227 @retval EFI_SUCCESS The alarm settings were returned.
228 @retval EFI_INVALID_PARAMETER Enabled is NULL.
229 @retval EFI_INVALID_PARAMETER Pending is NULL.
230 @retval EFI_INVALID_PARAMETER Time is NULL.
231 @retval EFI_DEVICE_ERROR The wakeup time could not be retrieved due to a hardware error.
232 @retval EFI_UNSUPPORTED A wakeup timer is not supported on this platform.
237 OUT BOOLEAN
*Enabled
,
238 OUT BOOLEAN
*Pending
,
240 IN PC_RTC_MODULE_GLOBALS
*Global
244 The user Entry Point for PcRTC module.
246 This is the entrhy point for PcRTC module. It installs the UEFI runtime service
247 including GetTime(),SetTime(),GetWakeupTime(),and SetWakeupTime().
249 @param ImageHandle The firmware allocated handle for the EFI image.
250 @param SystemTable A pointer to the EFI System Table.
252 @retval EFI_SUCCESS The entry point is executed successfully.
253 @retval Others Some error occurs when executing this entry point.
259 IN EFI_HANDLE ImageHandle
,
260 IN EFI_SYSTEM_TABLE
*SystemTable
264 See if all fields of a variable of EFI_TIME type is correct.
266 @param Time The time to be checked.
268 @retval EFI_INVALID_PARAMETER Some fields of Time are not correct.
269 @retval EFI_SUCCESS Time is a valid EFI_TIME variable.
278 Converts time from EFI_TIME format defined by UEFI spec to RTC's.
280 This function converts time from EFI_TIME format defined by UEFI spec to RTC's.
281 If data mode of RTC is BCD, then converts EFI_TIME to it.
282 If RTC is in 12-hour format, then converts EFI_TIME to it.
284 @param Time On input, the time data read from UEFI to convert
285 On output, the time converted to RTC format
286 @param RegisterB Value of Register B of RTC, indicating data mode
289 ConvertEfiTimeToRtcTime (
290 IN OUT EFI_TIME
*Time
,
291 IN RTC_REGISTER_B RegisterB
296 Converts time read from RTC to EFI_TIME format defined by UEFI spec.
298 This function converts raw time data read from RTC to the EFI_TIME format
299 defined by UEFI spec.
300 If data mode of RTC is BCD, then converts it to decimal,
301 If RTC is in 12-hour format, then converts it to 24-hour format.
303 @param Time On input, the time data read from RTC to convert
304 On output, the time converted to UEFI format
305 @param RegisterB Value of Register B of RTC, indicating data mode
308 @retval EFI_INVALID_PARAMETER Parameters passed in are invalid.
309 @retval EFI_SUCCESS Convert RTC time to EFI time successfully.
313 ConvertRtcTimeToEfiTime (
314 IN OUT EFI_TIME
*Time
,
315 IN RTC_REGISTER_B RegisterB
319 Wait for a period for the RTC to be ready.
321 @param Timeout Tell how long it should take to wait.
323 @retval EFI_DEVICE_ERROR RTC device error.
324 @retval EFI_SUCCESS RTC is updated and ready.
332 See if field Day of an EFI_TIME is correct.
334 @param Time Its Day field is to be checked.
336 @retval TRUE Day field of Time is correct.
337 @retval FALSE Day field of Time is NOT correct.
345 Check if it is a leapyear.
347 @param Time The time to be checked.
349 @retval TRUE It is a leapyear.
350 @retval FALSE It is NOT a leapyear.
358 Get the century RTC address from the ACPI FADT table.
360 @return The century RTC address or 0 if not found.
363 GetCenturyRtcAddress (
368 Notification function of ACPI Table change.
370 This is a notification function registered on ACPI Table change event.
371 It saves the Century address stored in ACPI FADT table.
373 @param Event Event whose notification function is being invoked.
374 @param Context Pointer to the notification function's context.
379 PcRtcAcpiTableChangeCallback (