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375 lines
11 KiB
C
375 lines
11 KiB
C
/** @file
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Header file for real time clock driver.
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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Copyright (c) 2017, AMD Inc. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#ifndef _RTC_H_
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#define _RTC_H_
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#include <Uefi.h>
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#include <Guid/Acpi.h>
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#include <Protocol/RealTimeClock.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/UefiLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/IoLib.h>
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#include <Library/TimerLib.h>
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#include <Library/UefiDriverEntryPoint.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiRuntimeLib.h>
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#include <Library/UefiRuntimeServicesTableLib.h>
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#include <Library/PcdLib.h>
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#include <Library/ReportStatusCodeLib.h>
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typedef struct {
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EFI_LOCK RtcLock;
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INT16 SavedTimeZone;
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UINT8 Daylight;
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UINT8 CenturyRtcAddress;
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} PC_RTC_MODULE_GLOBALS;
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extern PC_RTC_MODULE_GLOBALS mModuleGlobal;
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//
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// Dallas DS12C887 Real Time Clock
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//
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#define RTC_ADDRESS_SECONDS 0 // R/W Range 0..59
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#define RTC_ADDRESS_SECONDS_ALARM 1 // R/W Range 0..59
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#define RTC_ADDRESS_MINUTES 2 // R/W Range 0..59
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#define RTC_ADDRESS_MINUTES_ALARM 3 // R/W Range 0..59
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#define RTC_ADDRESS_HOURS 4 // R/W Range 1..12 or 0..23 Bit 7 is AM/PM
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#define RTC_ADDRESS_HOURS_ALARM 5 // R/W Range 1..12 or 0..23 Bit 7 is AM/PM
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#define RTC_ADDRESS_DAY_OF_THE_WEEK 6 // R/W Range 1..7
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#define RTC_ADDRESS_DAY_OF_THE_MONTH 7 // R/W Range 1..31
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#define RTC_ADDRESS_MONTH 8 // R/W Range 1..12
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#define RTC_ADDRESS_YEAR 9 // R/W Range 0..99
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#define RTC_ADDRESS_REGISTER_A 10 // R/W[0..6] R0[7]
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#define RTC_ADDRESS_REGISTER_B 11 // R/W
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#define RTC_ADDRESS_REGISTER_C 12 // RO
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#define RTC_ADDRESS_REGISTER_D 13 // RO
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//
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// Date and time initial values.
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// They are used if the RTC values are invalid during driver initialization
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//
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#define RTC_INIT_SECOND 0
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#define RTC_INIT_MINUTE 0
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#define RTC_INIT_HOUR 0
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#define RTC_INIT_DAY 1
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#define RTC_INIT_MONTH 1
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#pragma pack(1)
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//
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// Register A
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//
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typedef struct {
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UINT8 Rs : 4; // Rate Selection Bits
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UINT8 Dv : 3; // Divisor
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UINT8 Uip : 1; // Update in progress
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} RTC_REGISTER_A_BITS;
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typedef union {
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RTC_REGISTER_A_BITS Bits;
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UINT8 Data;
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} RTC_REGISTER_A;
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//
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// Register B
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//
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typedef struct {
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UINT8 Dse : 1; // 0 - Daylight saving disabled 1 - Daylight savings enabled
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UINT8 Mil : 1; // 0 - 12 hour mode 1 - 24 hour mode
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UINT8 Dm : 1; // 0 - BCD Format 1 - Binary Format
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UINT8 Sqwe : 1; // 0 - Disable SQWE output 1 - Enable SQWE output
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UINT8 Uie : 1; // 0 - Update INT disabled 1 - Update INT enabled
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UINT8 Aie : 1; // 0 - Alarm INT disabled 1 - Alarm INT Enabled
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UINT8 Pie : 1; // 0 - Periodic INT disabled 1 - Periodic INT Enabled
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UINT8 Set : 1; // 0 - Normal operation. 1 - Updates inhibited
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} RTC_REGISTER_B_BITS;
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typedef union {
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RTC_REGISTER_B_BITS Bits;
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UINT8 Data;
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} RTC_REGISTER_B;
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//
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// Register C
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//
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typedef struct {
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UINT8 Reserved : 4; // Read as zero. Can not be written.
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UINT8 Uf : 1; // Update End Interrupt Flag
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UINT8 Af : 1; // Alarm Interrupt Flag
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UINT8 Pf : 1; // Periodic Interrupt Flag
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UINT8 Irqf : 1; // Iterrupt Request Flag = PF & PIE | AF & AIE | UF & UIE
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} RTC_REGISTER_C_BITS;
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typedef union {
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RTC_REGISTER_C_BITS Bits;
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UINT8 Data;
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} RTC_REGISTER_C;
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//
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// Register D
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//
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typedef struct {
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UINT8 Reserved : 7; // Read as zero. Can not be written.
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UINT8 Vrt : 1; // Valid RAM and Time
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} RTC_REGISTER_D_BITS;
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typedef union {
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RTC_REGISTER_D_BITS Bits;
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UINT8 Data;
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} RTC_REGISTER_D;
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#pragma pack()
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/**
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Initialize RTC.
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@param Global For global use inside this module.
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@retval EFI_DEVICE_ERROR Initialization failed due to device error.
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@retval EFI_SUCCESS Initialization successful.
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**/
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EFI_STATUS
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PcRtcInit (
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IN PC_RTC_MODULE_GLOBALS *Global
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);
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/**
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Sets the current local time and date information.
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@param Time A pointer to the current time.
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@param Global For global use inside this module.
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@retval EFI_SUCCESS The operation completed successfully.
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@retval EFI_INVALID_PARAMETER A time field is out of range.
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@retval EFI_DEVICE_ERROR The time could not be set due due to hardware error.
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**/
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EFI_STATUS
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PcRtcSetTime (
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IN EFI_TIME *Time,
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IN PC_RTC_MODULE_GLOBALS *Global
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);
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/**
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Returns the current time and date information, and the time-keeping capabilities
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of the hardware platform.
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@param Time A pointer to storage to receive a snapshot of the current time.
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@param Capabilities An optional pointer to a buffer to receive the real time clock
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device's capabilities.
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@param Global For global use inside this module.
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@retval EFI_SUCCESS The operation completed successfully.
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@retval EFI_INVALID_PARAMETER Time is NULL.
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@retval EFI_DEVICE_ERROR The time could not be retrieved due to hardware error.
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**/
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EFI_STATUS
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PcRtcGetTime (
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OUT EFI_TIME *Time,
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OUT EFI_TIME_CAPABILITIES *Capabilities, OPTIONAL
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IN PC_RTC_MODULE_GLOBALS *Global
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);
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/**
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Sets the system wakeup alarm clock time.
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@param Enabled Enable or disable the wakeup alarm.
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@param Time If Enable is TRUE, the time to set the wakeup alarm for.
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If Enable is FALSE, then this parameter is optional, and may be NULL.
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@param Global For global use inside this module.
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@retval EFI_SUCCESS If Enable is TRUE, then the wakeup alarm was enabled.
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If Enable is FALSE, then the wakeup alarm was disabled.
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@retval EFI_INVALID_PARAMETER A time field is out of range.
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@retval EFI_DEVICE_ERROR The wakeup time could not be set due to a hardware error.
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@retval EFI_UNSUPPORTED A wakeup timer is not supported on this platform.
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**/
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EFI_STATUS
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PcRtcSetWakeupTime (
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IN BOOLEAN Enable,
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IN EFI_TIME *Time, OPTIONAL
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IN PC_RTC_MODULE_GLOBALS *Global
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);
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/**
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Returns the current wakeup alarm clock setting.
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@param Enabled Indicates if the alarm is currently enabled or disabled.
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@param Pending Indicates if the alarm signal is pending and requires acknowledgement.
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@param Time The current alarm setting.
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@param Global For global use inside this module.
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@retval EFI_SUCCESS The alarm settings were returned.
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@retval EFI_INVALID_PARAMETER Enabled is NULL.
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@retval EFI_INVALID_PARAMETER Pending is NULL.
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@retval EFI_INVALID_PARAMETER Time is NULL.
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@retval EFI_DEVICE_ERROR The wakeup time could not be retrieved due to a hardware error.
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@retval EFI_UNSUPPORTED A wakeup timer is not supported on this platform.
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**/
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EFI_STATUS
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PcRtcGetWakeupTime (
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OUT BOOLEAN *Enabled,
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OUT BOOLEAN *Pending,
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OUT EFI_TIME *Time,
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IN PC_RTC_MODULE_GLOBALS *Global
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);
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/**
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The user Entry Point for PcRTC module.
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This is the entrhy point for PcRTC module. It installs the UEFI runtime service
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including GetTime(),SetTime(),GetWakeupTime(),and SetWakeupTime().
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@param ImageHandle The firmware allocated handle for the EFI image.
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@param SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The entry point is executed successfully.
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@retval Others Some error occurs when executing this entry point.
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**/
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EFI_STATUS
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EFIAPI
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InitializePcRtc (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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);
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/**
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See if all fields of a variable of EFI_TIME type is correct.
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@param Time The time to be checked.
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@retval EFI_INVALID_PARAMETER Some fields of Time are not correct.
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@retval EFI_SUCCESS Time is a valid EFI_TIME variable.
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**/
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EFI_STATUS
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RtcTimeFieldsValid (
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IN EFI_TIME *Time
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);
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/**
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Converts time from EFI_TIME format defined by UEFI spec to RTC's.
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This function converts time from EFI_TIME format defined by UEFI spec to RTC's.
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If data mode of RTC is BCD, then converts EFI_TIME to it.
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If RTC is in 12-hour format, then converts EFI_TIME to it.
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@param Time On input, the time data read from UEFI to convert
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On output, the time converted to RTC format
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@param RegisterB Value of Register B of RTC, indicating data mode
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**/
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VOID
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ConvertEfiTimeToRtcTime (
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IN OUT EFI_TIME *Time,
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IN RTC_REGISTER_B RegisterB
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);
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/**
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Converts time read from RTC to EFI_TIME format defined by UEFI spec.
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This function converts raw time data read from RTC to the EFI_TIME format
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defined by UEFI spec.
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If data mode of RTC is BCD, then converts it to decimal,
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If RTC is in 12-hour format, then converts it to 24-hour format.
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@param Time On input, the time data read from RTC to convert
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On output, the time converted to UEFI format
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@param RegisterB Value of Register B of RTC, indicating data mode
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and hour format.
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@retval EFI_INVALID_PARAMETER Parameters passed in are invalid.
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@retval EFI_SUCCESS Convert RTC time to EFI time successfully.
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**/
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EFI_STATUS
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ConvertRtcTimeToEfiTime (
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IN OUT EFI_TIME *Time,
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IN RTC_REGISTER_B RegisterB
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);
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/**
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Wait for a period for the RTC to be ready.
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@param Timeout Tell how long it should take to wait.
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@retval EFI_DEVICE_ERROR RTC device error.
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@retval EFI_SUCCESS RTC is updated and ready.
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**/
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EFI_STATUS
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RtcWaitToUpdate (
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UINTN Timeout
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);
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/**
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See if field Day of an EFI_TIME is correct.
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@param Time Its Day field is to be checked.
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@retval TRUE Day field of Time is correct.
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@retval FALSE Day field of Time is NOT correct.
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**/
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BOOLEAN
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DayValid (
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IN EFI_TIME *Time
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);
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/**
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Check if it is a leapyear.
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@param Time The time to be checked.
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@retval TRUE It is a leapyear.
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@retval FALSE It is NOT a leapyear.
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**/
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BOOLEAN
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IsLeapYear (
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IN EFI_TIME *Time
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);
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/**
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Get the century RTC address from the ACPI FADT table.
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@return The century RTC address or 0 if not found.
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**/
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UINT8
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GetCenturyRtcAddress (
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VOID
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);
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/**
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Notification function of ACPI Table change.
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This is a notification function registered on ACPI Table change event.
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It saves the Century address stored in ACPI FADT table.
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@param Event Event whose notification function is being invoked.
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@param Context Pointer to the notification function's context.
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**/
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VOID
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EFIAPI
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PcRtcAcpiTableChangeCallback (
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IN EFI_EVENT Event,
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IN VOID *Context
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);
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#endif
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