[PATCH edk2-platforms 2/4] Silicon/Maxim: Added Support for DS3232 RTC Library

[Wasim Khan <wasim.khan@nxp.com>]

This patch adds support for DS3232 RTC Library

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Wasim Khan <wasim.khan@nxp.com>
---
 Silicon/Maxim/Library/Ds3232RtcLib/Ds3232Rtc.h     |  49 +++
 Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.c  | 370 +++++++++++++++++++++
 .../Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.dec    |  31 ++
 .../Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.inf    |  50 +++
 4 files changed, 500 insertions(+)
 create mode 100644 Silicon/Maxim/Library/Ds3232RtcLib/Ds3232Rtc.h
 create mode 100644 Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.c
 create mode 100644 Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.dec
 create mode 100644 Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.inf

diff --git a/Silicon/Maxim/Library/Ds3232RtcLib/Ds3232Rtc.h b/Silicon/Maxim/Library/Ds3232RtcLib/Ds3232Rtc.h
new file mode 100644
index 0000000..cd1a321
--- /dev/null
+++ b/Silicon/Maxim/Library/Ds3232RtcLib/Ds3232Rtc.h
@@ -0,0 +1,49 @@
+/** Ds3232Rtc.h
+*
+*  Copyright 2017 NXP
+*
+*  This program and the accompanying materials
+*  are licensed and made available under the terms and conditions of the BSD License
+*  which accompanies this distribution.  The full text of the license may be found at
+*  http://opensource.org/licenses/bsd-license.php
+*
+*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+*
+**/
+
+#ifndef __DS3232RTC_H__
+#define __DS3232RTC_H__
+
+//RTC time register
+#define DS3232_SEC_REG_ADDR        0x00
+#define DS3232_MIN_REG_ADDR        0x01
+#define DS3232_HR_REG_ADDR         0x02
+#define DS3232_DAY_REG_ADDR        0x03
+#define DS3232_DATE_REG_ADDR       0x04
+#define DS3232_MON_REG_ADDR        0x05
+#define DS3232_YR_REG_ADDR         0x06
+
+#define DS3232_SEC_BIT_CH          0x80  // Clock Halt (in Register 0)
+
+//RTC control register
+#define DS3232_CTL_REG_ADDR        0x0e
+#define DS3232_STAT_REG_ADDR       0x0f
+
+#define START_YEAR                 1970
+#define END_YEAR                   2070
+
+//TIME MASKS
+#define MASK_SEC                   0x7F
+#define MASK_MIN                   0x7F
+#define MASK_HOUR                  0x3F
+#define MASK_DAY                   0x3F
+#define MASK_MONTH                 0x1F
+
+typedef struct {
+  UINTN                           OperationCount;
+  EFI_I2C_OPERATION               SetAddressOp;
+  EFI_I2C_OPERATION               GetSetDateTimeOp;
+} RTC_I2C_REQUEST;
+
+#endif // __DS3232RTC_H__
diff --git a/Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.c b/Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.c
new file mode 100644
index 0000000..a1f5226
--- /dev/null
+++ b/Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.c
@@ -0,0 +1,370 @@
+/** Ds3232RtcLib.c
+*  Implement EFI RealTimeClock via RTC Lib for DS3232 RTC.
+*
+*  Based on RTC implementation available in
+*  EmbeddedPkg/Library/TemplateRealTimeClockLib/RealTimeClockLib.c
+*
+*  Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
+*  Copyright 2017 NXP
+*
+*  This program and the accompanying materials
+*  are licensed and made available under the terms and conditions of the BSD License
+*  which accompanies this distribution.  The full text of the license may be found at
+*  http://opensource.org/licenses/bsd-license.php
+*
+*  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+*  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+*
+**/
+
+#include <PiDxe.h>
+#include <Base.h>
+#include <Library/BaseLib.h>
+#include <Library/DebugLib.h>
+#include <Library/RealTimeClockLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiLib.h>
+#include <Protocol/I2cMaster.h>
+
+#include "Ds3232Rtc.h"
+
+STATIC VOID                       *mDriverEventRegistration;
+STATIC EFI_I2C_MASTER_PROTOCOL    *mI2cMaster;
+
+/**
+  Read RTC register.
+
+  @param  SlaveDeviceAddress   Slave device address offset of RTC to be read.
+  @param  RtcRegAddr           Register offset of RTC to be read.
+
+  @retval                      Register Value read
+
+**/
+STATIC
+UINT8
+RtcRead (
+  IN  UINT8                SlaveDeviceAddress,
+  IN  UINT8                RtcRegAddr
+  )
+{
+  RTC_I2C_REQUEST          Req;
+  EFI_STATUS               Status;
+  UINT8                    Val;
+
+  Val = 0;
+
+  Req.OperationCount = 2;
+
+  Req.SetAddressOp.Flags = 0;
+  Req.SetAddressOp.LengthInBytes = 1;
+  Req.SetAddressOp.Buffer = &RtcRegAddr;
+
+  Req.GetSetDateTimeOp.Flags = I2C_FLAG_READ;
+  Req.GetSetDateTimeOp.LengthInBytes = sizeof (Val);
+  Req.GetSetDateTimeOp.Buffer = &Val;
+
+  Status = mI2cMaster->StartRequest (mI2cMaster, SlaveDeviceAddress,
+                                     (VOID *)&Req,
+                                     NULL,  NULL);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "RTC read error at Addr:0x%x\n", RtcRegAddr));
+  }
+
+  return Val;
+}
+
+/**
+  Write RTC register.
+
+  @param  SlaveDeviceAddress   Slave device address offset of RTC to be read.
+  @param  RtcRegAddr           Register offset of RTC to write.
+  @param  Val                  Value to be written
+
+**/
+STATIC
+VOID
+RtcWrite (
+  IN  UINT8                SlaveDeviceAddress,
+  IN  UINT8                RtcRegAddr,
+  IN  UINT8                Val
+  )
+{
+  RTC_I2C_REQUEST          Req;
+  EFI_STATUS               Status;
+
+  Req.OperationCount = 2;
+
+  Req.SetAddressOp.Flags = 0;
+  Req.SetAddressOp.LengthInBytes = 1;
+  Req.SetAddressOp.Buffer = &RtcRegAddr;
+
+  Req.GetSetDateTimeOp.Flags = 0;
+  Req.GetSetDateTimeOp.LengthInBytes = sizeof (Val);
+  Req.GetSetDateTimeOp.Buffer = &Val;
+
+  Status = mI2cMaster->StartRequest (mI2cMaster, SlaveDeviceAddress,
+                                     (VOID *)&Req,
+                                     NULL,  NULL);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "RTC write error at Addr:0x%x\n", RtcRegAddr));
+  }
+}
+
+/**
+  Configure the MUX device connected to I2C.
+
+  @param  RegValue               Value to write on mux device register address
+
+**/
+VOID
+ConfigureMuxDevice (
+  IN  UINT8                RegValue
+  )
+{
+  RtcWrite (FixedPcdGet8 (PcdMuxDeviceAddress), FixedPcdGet8 (PcdMuxControlRegOffset), RegValue);
+}
+
+/**
+  Returns the current time and date information, and the time-keeping capabilities
+  of the hardware platform.
+
+  @param  Time                  A pointer to storage to receive a snapshot of the current time.
+  @param  Capabilities          An optional pointer to a buffer to receive the real time clock
+                                device's capabilities.
+
+  @retval EFI_SUCCESS           The operation completed successfully.
+  @retval EFI_INVALID_PARAMETER Time is NULL.
+  @retval EFI_DEVICE_ERROR      The time could not be retrieved due to hardware error.
+
+**/
+EFI_STATUS
+EFIAPI
+LibGetTime (
+  OUT  EFI_TIME                 *Time,
+  OUT  EFI_TIME_CAPABILITIES    *Capabilities
+  )
+{
+  EFI_STATUS                    Status;
+  UINT8                         Second;
+  UINT8                         Minute;
+  UINT8                         Hour;
+  UINT8                         Day;
+  UINT8                         Month;
+  UINT8                         Year;
+
+  if (mI2cMaster == NULL) {
+    return EFI_DEVICE_ERROR;
+  }
+
+  Status = EFI_SUCCESS;
+
+  //
+  // Check if the I2C device is connected though a MUX device.
+  //
+  if (FixedPcdGetBool (PcdIsRtcDeviceMuxed)) {
+    // Switch to the channel connected to Ds3232 RTC
+    ConfigureMuxDevice (FixedPcdGet8 (PcdMuxRtcChannelValue));
+  }
+
+  Second = RtcRead (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_SEC_REG_ADDR);
+  Minute = RtcRead (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_MIN_REG_ADDR);
+  Hour = RtcRead (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_HR_REG_ADDR);
+  Day = RtcRead (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_DATE_REG_ADDR);
+  Month = RtcRead (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_MON_REG_ADDR);
+  Year = RtcRead (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_YR_REG_ADDR);
+
+  if (Second & DS3232_SEC_BIT_CH) {
+    DEBUG ((DEBUG_ERROR, "### Warning: RTC oscillator has stopped\n"));
+    /* clear the CH flag */
+    RtcWrite (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_SEC_REG_ADDR,
+              RtcRead (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_SEC_REG_ADDR) & ~DS3232_SEC_BIT_CH);
+    Status = EFI_DEVICE_ERROR;
+    goto EXIT;
+  }
+
+  Time->Second  = BcdToDecimal8 (Second & MASK_SEC);
+  Time->Minute  = BcdToDecimal8 (Minute & MASK_MIN);
+  Time->Hour = BcdToDecimal8 (Hour & MASK_HOUR);
+  Time->Day = BcdToDecimal8 (Day & MASK_DAY);
+  Time->Month  = BcdToDecimal8 (Month & MASK_MONTH);
+
+  //
+  // RTC can save year 1970 to 2069
+  // On writing Year, save year % 100
+  // On Reading reversing the operation e.g. 2012
+  // write = 12 (2012 % 100)
+  // read = 2012 (12 + 2000)
+  //
+  Time->Year = BcdToDecimal8 (Year) +
+               (BcdToDecimal8 (Year) >= 70 ? START_YEAR - 70 : END_YEAR -70);
+
+EXIT:
+  if (FixedPcdGetBool (PcdIsRtcDeviceMuxed)) {
+    // Switch to the default channel
+    ConfigureMuxDevice (FixedPcdGet8 (PcdMuxDefaultChannelValue));
+  }
+
+  return Status;
+}
+
+/**
+  Sets the current local time and date information.
+
+  @param  Time                  A pointer to the current time.
+
+  @retval EFI_SUCCESS           The operation completed successfully.
+  @retval EFI_INVALID_PARAMETER A time field is out of range.
+
+**/
+EFI_STATUS
+EFIAPI
+LibSetTime (
+  IN  EFI_TIME                *Time
+  )
+{
+  if (mI2cMaster == NULL) {
+    return EFI_DEVICE_ERROR;
+  }
+
+  if (Time->Year < START_YEAR || Time->Year >= END_YEAR){
+    DEBUG ((DEBUG_ERROR, "WARNING: Year should be between 1970 and 2069!\n"));
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // Check if the I2C device is connected though a MUX device.
+  //
+  if (FixedPcdGetBool (PcdIsRtcDeviceMuxed)) {
+    // Switch to the channel connected to Ds3232 RTC
+    ConfigureMuxDevice (FixedPcdGet8 (PcdMuxRtcChannelValue));
+  }
+
+  RtcWrite (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_YR_REG_ADDR, DecimalToBcd8 (Time->Year % 100));
+  RtcWrite (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_MON_REG_ADDR, DecimalToBcd8 (Time->Month));
+  RtcWrite (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_DATE_REG_ADDR, DecimalToBcd8 (Time->Day));
+  RtcWrite (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_HR_REG_ADDR, DecimalToBcd8 (Time->Hour));
+  RtcWrite (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_MIN_REG_ADDR, DecimalToBcd8 (Time->Minute));
+  RtcWrite (FixedPcdGet8 (PcdI2cSlaveAddress), DS3232_SEC_REG_ADDR, DecimalToBcd8 (Time->Second));
+
+  if (FixedPcdGetBool (PcdIsRtcDeviceMuxed)) {
+    // Switch to the default channel
+    ConfigureMuxDevice (FixedPcdGet8 (PcdMuxDefaultChannelValue));
+  }
+
+  return EFI_SUCCESS;
+}
+
+/**
+  Returns the current wakeup alarm clock setting.
+
+  @param  Enabled               Indicates if the alarm is currently enabled or disabled.
+  @param  Pending               Indicates if the alarm signal is pending and requires acknowledgement.
+  @param  Time                  The current alarm setting.
+
+  @retval EFI_SUCCESS           The alarm settings were returned.
+  @retval EFI_INVALID_PARAMETER Any parameter is NULL.
+  @retval EFI_DEVICE_ERROR      The wakeup time could not be retrieved due to a hardware error.
+
+**/
+EFI_STATUS
+EFIAPI
+LibGetWakeupTime (
+  OUT  BOOLEAN                  *Enabled,
+  OUT  BOOLEAN                  *Pending,
+  OUT  EFI_TIME                 *Time
+  )
+{
+  // Not a required feature
+  return EFI_UNSUPPORTED;
+}
+
+/**
+  Sets the system wakeup alarm clock time.
+
+  @param  Enabled               Enable or disable the wakeup alarm.
+  @param  Time                  If Enable is TRUE, the time to set the wakeup alarm for.
+
+  @retval EFI_SUCCESS           If Enable is TRUE, then the wakeup alarm was enabled. If
+                                Enable is FALSE, then the wakeup alarm was disabled.
+  @retval EFI_INVALID_PARAMETER A time field is out of range.
+  @retval EFI_DEVICE_ERROR      The wakeup time could not be set due to a hardware error.
+  @retval EFI_UNSUPPORTED       A wakeup timer is not supported on this platform.
+
+**/
+EFI_STATUS
+EFIAPI
+LibSetWakeupTime (
+  IN BOOLEAN                    Enabled,
+  OUT EFI_TIME                  *Time
+  )
+{
+  // Not a required feature
+  return EFI_UNSUPPORTED;
+}
+
+STATIC
+VOID
+I2cDriverRegistrationEvent (
+  IN  EFI_EVENT                 Event,
+  IN  VOID                      *Context
+  )
+{
+  EFI_STATUS                    Status;
+  EFI_I2C_MASTER_PROTOCOL       *I2cMaster;
+  UINTN                         BusFrequency;
+
+  Status = gBS->LocateProtocol (&gEfiI2cMasterProtocolGuid, NULL, (VOID **)&I2cMaster);
+
+  gBS->CloseEvent (Event);
+
+  ASSERT_EFI_ERROR (Status);
+
+  Status = I2cMaster->Reset (I2cMaster);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a: I2CMaster->Reset () failed - %r\n",
+      __FUNCTION__, Status));
+    return;
+  }
+
+  BusFrequency = FixedPcdGet16 (PcdI2cBusFrequency);
+  Status = I2cMaster->SetBusFrequency (I2cMaster, &BusFrequency);
+  if (EFI_ERROR (Status)) {
+    DEBUG ((DEBUG_ERROR, "%a: I2CMaster->SetBusFrequency () failed - %r\n",
+      __FUNCTION__, Status));
+    return;
+  }
+
+  mI2cMaster = I2cMaster;
+}
+
+/**
+  This is the declaration of an EFI image entry point. This can be the entry point to an application
+  written to this specification, an EFI boot service driver.
+
+  @param  ImageHandle           Handle that identifies the loaded image.
+  @param  SystemTable           System Table for this image.
+
+  @retval EFI_SUCCESS           The operation completed successfully.
+
+**/
+EFI_STATUS
+EFIAPI
+LibRtcInitialize (
+  IN EFI_HANDLE                 ImageHandle,
+  IN EFI_SYSTEM_TABLE           *SystemTable
+  )
+{
+  //
+  // Register a protocol registration notification callback on the driver
+  // binding protocol so we can attempt to connect our I2C master to it
+  // as soon as it appears.
+  //
+  EfiCreateProtocolNotifyEvent (
+    &gEfiI2cMasterProtocolGuid,
+    TPL_CALLBACK,
+    I2cDriverRegistrationEvent,
+    NULL,
+    &mDriverEventRegistration);
+
+  return EFI_SUCCESS;
+}
diff --git a/Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.dec b/Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.dec
new file mode 100644
index 0000000..4471d57
--- /dev/null
+++ b/Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.dec
@@ -0,0 +1,31 @@
+#/** @file
+#
+# Copyright 2017 NXP
+#
+# This program and the accompanying materials
+# are licensed and made available under the terms and conditions of the BSD License
+# which accompanies this distribution.  The full text of the license may be found at
+# http://opensource.org/licenses/bsd-license.php
+#
+# THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+# WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#**/
+
+[Defines]
+  DEC_SPECIFICATION              = 0x0001001A
+  PACKAGE_NAME                   = Ds3232RtcLib
+  PACKAGE_GUID                   = 0b4192f7-e404-4019-b2e5-1e6004da3313
+  PACKAGE_VERSION                = 0.1
+
+[Guids]
+  gDs3232RtcLibTokenSpaceGuid = { 0x7960fc51, 0x0832, 0x4f0b, { 0xb4, 0x22, 0x53, 0x87, 0x03, 0xaa, 0x85, 0xda }}
+
+[PcdsFixedAtBuild]
+  gDs3232RtcLibTokenSpaceGuid.PcdI2cSlaveAddress|0|UINT8|0x00000001
+  gDs3232RtcLibTokenSpaceGuid.PcdI2cBusFrequency|0|UINT32|0x00000002
+  gDs3232RtcLibTokenSpaceGuid.PcdIsRtcDeviceMuxed|FALSE|BOOLEAN|0x00000003
+  gDs3232RtcLibTokenSpaceGuid.PcdMuxDeviceAddress|0|UINT8|0x00000004
+  gDs3232RtcLibTokenSpaceGuid.PcdMuxControlRegOffset|0|UINT8|0x00000005
+  gDs3232RtcLibTokenSpaceGuid.PcdMuxRtcChannelValue|0|UINT8|0x00000006
+  gDs3232RtcLibTokenSpaceGuid.PcdMuxDefaultChannelValue|0|UINT8|0x00000007
diff --git a/Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.inf b/Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.inf
new file mode 100644
index 0000000..836fc64
--- /dev/null
+++ b/Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.inf
@@ -0,0 +1,50 @@
+#  @Ds3232RtcLib.inf
+#
+#  Copyright (c) 2016, Freescale Semiconductor, Inc. All rights reserved.
+#  Copyright (c) 2017 NXP
+#
+#  This program and the accompanying materials
+#  are licensed and made available under the terms and conditions of the BSD License
+#  which accompanies this distribution. The full text of the license may be found at
+#  http://opensource.org/licenses/bsd-license.php
+#  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+#
+#
+
+[Defines]
+  INF_VERSION                    = 0x0001001A
+  BASE_NAME                      = Ds3232RtcLib
+  FILE_GUID                      = 97f1f2c2-51e1-47ad-9660-70b33da1fe71
+  MODULE_TYPE                    = BASE
+  VERSION_STRING                 = 1.0
+  LIBRARY_CLASS                  = RealTimeClockLib
+
+[Sources.common]
+  Ds3232RtcLib.c
+
+[Packages]
+  EmbeddedPkg/EmbeddedPkg.dec
+  MdePkg/MdePkg.dec
+  Silicon/Maxim/Library/Ds3232RtcLib/Ds3232RtcLib.dec
+
+[LibraryClasses]
+  DebugLib
+  UefiBootServicesTableLib
+  UefiLib
+
+[Protocols]
+  gEfiDriverBindingProtocolGuid        ## CONSUMES
+  gEfiI2cMasterProtocolGuid            ## CONSUMES
+
+[FixedPcd]
+  gDs3232RtcLibTokenSpaceGuid.PcdI2cSlaveAddress
+  gDs3232RtcLibTokenSpaceGuid.PcdI2cBusFrequency
+  gDs3232RtcLibTokenSpaceGuid.PcdIsRtcDeviceMuxed
+  gDs3232RtcLibTokenSpaceGuid.PcdMuxDeviceAddress
+  gDs3232RtcLibTokenSpaceGuid.PcdMuxControlRegOffset
+  gDs3232RtcLibTokenSpaceGuid.PcdMuxRtcChannelValue
+  gDs3232RtcLibTokenSpaceGuid.PcdMuxDefaultChannelValue
+
+[Depex]
+  gEfiI2cMasterProtocolGuid
-- 
2.7.4