Implement a I2C DXE driver that wires up the I2C devices exposed by a 96boards mezzanine into the EDK2 I2C stack. Note that this requires the platform to identify its I2C master implementations using special GUIDs-as-protocols. It also assumes [for now] that I2C buses are not shared between the 96boards connector and other platform peripherals.
Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org> --- Platform/NinetySixBoards/NinetySixBoardsI2cDxe/NinetySixBoardsI2cDxe.c | 202 ++++++++++++++++++++ Platform/NinetySixBoards/NinetySixBoardsI2cDxe/NinetySixBoardsI2cDxe.inf | 51 +++++ 2 files changed, 253 insertions(+) diff --git a/Platform/NinetySixBoards/NinetySixBoardsI2cDxe/NinetySixBoardsI2cDxe.c b/Platform/NinetySixBoards/NinetySixBoardsI2cDxe/NinetySixBoardsI2cDxe.c new file mode 100644 index 000000000000..9a779626b19f --- /dev/null +++ b/Platform/NinetySixBoards/NinetySixBoardsI2cDxe/NinetySixBoardsI2cDxe.c @@ -0,0 +1,202 @@ +/** @file + + Copyright (c) 2018, Linaro, Ltd. All rights reserved.<BR> + + 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 <Library/BaseMemoryLib.h> +#include <Library/DebugLib.h> +#include <Library/UefiBootServicesTableLib.h> +#include <Library/UefiLib.h> +#include <Protocol/I2cBusConfigurationManagement.h> +#include <Protocol/I2cEnumerate.h> +#include <Protocol/I2cMaster.h> +#include <Protocol/Mezzanine.h> + +STATIC MEZZANINE_PROTOCOL *mMezzanine; + +typedef struct { + EFI_I2C_ENUMERATE_PROTOCOL I2cEnumerate; + EFI_I2C_BUS_CONFIGURATION_MANAGEMENT_PROTOCOL I2cConfigManagement; + EFI_HANDLE I2cMasterHandle; + UINT32 BusFrequency; + UINTN NumDevices; + CONST EFI_I2C_DEVICE *Devices; +} I2C_BUS; + +STATIC +EFI_STATUS +EFIAPI +I2cEnumerate ( + IN CONST EFI_I2C_ENUMERATE_PROTOCOL *This, + IN OUT CONST EFI_I2C_DEVICE **Device + ) +{ + I2C_BUS *Bus; + + if (Device == NULL) { + return EFI_INVALID_PARAMETER; + } + + Bus = BASE_CR (This, I2C_BUS, I2cEnumerate); + + if (*Device == NULL) { + *Device = &Bus->Devices[0]; + } else if (*Device >= &Bus->Devices[0] && + *Device < &Bus->Devices[Bus->NumDevices - 2]) { + ++*Device; + } else { + return EFI_NO_MAPPING; + } + return EFI_SUCCESS; +} + +STATIC +EFI_STATUS +EFIAPI +I2cGetBusFrequency ( + IN CONST EFI_I2C_ENUMERATE_PROTOCOL *This, + IN UINTN I2cBusConfiguration, + OUT UINTN *BusClockHertz + ) +{ + I2C_BUS *Bus; + + if (BusClockHertz == NULL) { + return EFI_INVALID_PARAMETER; + } + + if (I2cBusConfiguration > 0) { + return EFI_NO_MAPPING; + } + + Bus = BASE_CR (This, I2C_BUS, I2cEnumerate); + + *BusClockHertz = Bus->BusFrequency; + + return EFI_SUCCESS; +} + +STATIC +EFI_STATUS +EFIAPI +EnableI2cBusConfiguration ( + IN CONST EFI_I2C_BUS_CONFIGURATION_MANAGEMENT_PROTOCOL *This, + IN UINTN I2cBusConfiguration, + IN EFI_EVENT Event OPTIONAL, + IN EFI_STATUS *I2cStatus OPTIONAL + ) +{ + EFI_I2C_MASTER_PROTOCOL *I2cMaster; + EFI_STATUS Status; + UINTN BusClockHertz; + I2C_BUS *Bus; + + if (I2cBusConfiguration > 0) { + return EFI_NO_MAPPING; + } + + Bus = BASE_CR (This, I2C_BUS, I2cConfigManagement); + + Status = gBS->HandleProtocol (Bus->I2cMasterHandle, + &gEfiI2cMasterProtocolGuid, (VOID **)&I2cMaster); + if (EFI_ERROR (Status)) { + DEBUG ((DEBUG_ERROR, "%a: gBS->HandleProtocol() failed - %r\n", + __FUNCTION__, Status)); + return Status; + } + + BusClockHertz = Bus->BusFrequency; + Status = I2cMaster->SetBusFrequency (I2cMaster, &BusClockHertz); + if (EFI_ERROR (Status)) { + DEBUG ((DEBUG_ERROR, "%a: I2cMaster->SetBusFrequency() failed - %r\n", + __FUNCTION__, Status)); + return Status; + } + + if (Event != NULL) { + *I2cStatus = EFI_SUCCESS; + gBS->SignalEvent (Event); + } + return EFI_SUCCESS; +} + +STATIC I2C_BUS mI2cBus0 = { + { I2cEnumerate, I2cGetBusFrequency }, + { EnableI2cBusConfiguration }, + NULL, + FixedPcdGet32 (PcdI2c0BusFrequencyHz), + 0, + NULL, +}; + +STATIC I2C_BUS mI2cBus1 = { + { I2cEnumerate, I2cGetBusFrequency }, + { EnableI2cBusConfiguration }, + NULL, + FixedPcdGet32 (PcdI2c1BusFrequencyHz), + 0, + NULL, +}; + +STATIC +VOID +RegisterI2cBus ( + IN EFI_GUID *Guid, + IN I2C_BUS *I2cBus, + IN UINTN NumDevices, + IN CONST EFI_I2C_DEVICE *Devices + ) +{ + EFI_STATUS Status; + UINTN BufferSize; + + BufferSize = sizeof (EFI_HANDLE); + Status = gBS->LocateHandle (ByProtocol, Guid, NULL, &BufferSize, + &I2cBus->I2cMasterHandle); + if (EFI_ERROR (Status)) { + DEBUG ((DEBUG_INFO, "%a: gBS->LocateHandle() failed - %r\n", __FUNCTION__, + Status)); + return; + } + + I2cBus->NumDevices = NumDevices; + I2cBus->Devices = Devices; + + Status = gBS->InstallMultipleProtocolInterfaces (&I2cBus->I2cMasterHandle, + &gEfiI2cEnumerateProtocolGuid, + &I2cBus->I2cEnumerate, + &gEfiI2cBusConfigurationManagementProtocolGuid, + &I2cBus->I2cConfigManagement, + NULL); + ASSERT_EFI_ERROR (Status); +} + +EFI_STATUS +EFIAPI +EntryPoint ( + IN EFI_HANDLE ImageHandle, + IN EFI_SYSTEM_TABLE *SystemTable + ) +{ + EFI_STATUS Status; + + Status = gBS->LocateProtocol (&gNinetySixBoardsMezzanineProtocolGuid, NULL, + (VOID **)&mMezzanine); + ASSERT_EFI_ERROR (Status); + + RegisterI2cBus (&gNinetySixBoardsI2c0MasterGuid, &mI2cBus0, + mMezzanine->I2c0NumDevices, mMezzanine->I2c0DeviceArray); + RegisterI2cBus (&gNinetySixBoardsI2c1MasterGuid, &mI2cBus1, + mMezzanine->I2c1NumDevices, mMezzanine->I2c1DeviceArray); + + return EFI_SUCCESS; +} diff --git a/Platform/NinetySixBoards/NinetySixBoardsI2cDxe/NinetySixBoardsI2cDxe.inf b/Platform/NinetySixBoards/NinetySixBoardsI2cDxe/NinetySixBoardsI2cDxe.inf new file mode 100644 index 000000000000..9875566b6425 --- /dev/null +++ b/Platform/NinetySixBoards/NinetySixBoardsI2cDxe/NinetySixBoardsI2cDxe.inf @@ -0,0 +1,51 @@ +## @file +# +# Copyright (c) 2018, Linaro Ltd. All rights reserved.<BR> +# +# 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 = NinetySixBoardsI2cDxe + FILE_GUID = a59176bc-a151-49c8-b54a-b4ac96f436c3 + MODULE_TYPE = DXE_DRIVER + VERSION_STRING = 0.1 + ENTRY_POINT = EntryPoint + +[Sources] + NinetySixBoardsI2cDxe.c + +[Packages] + MdePkg/MdePkg.dec + Platform/NinetySixBoards/NinetySixBoards.dec + +[LibraryClasses] + DebugLib + UefiBootServicesTableLib + UefiDriverEntryPoint + UefiLib + +[Protocols] + gNinetySixBoardsMezzanineProtocolGuid ## CONSUMES + gEfiI2cBusConfigurationManagementProtocolGuid ## PRODUCES + gEfiI2cEnumerateProtocolGuid ## PRODUCES + gEfiI2cMasterProtocolGuid ## CONSUMES + +[Guids] + gNinetySixBoardsI2c0MasterGuid + gNinetySixBoardsI2c1MasterGuid + +[FixedPcd] + gNinetySixBoardsTokenSpaceGuid.PcdI2c0BusFrequencyHz + gNinetySixBoardsTokenSpaceGuid.PcdI2c1BusFrequencyHz + +[Depex] + gNinetySixBoardsMezzanineProtocolGuid AND gNinetySixBoardsI2c0MasterGuid OR gNinetySixBoardsI2c1MasterGuid -- 2.11.0 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
