BaseSpiHcPlatformLibNull.c File Reference

#include <PiDxe.h>
#include <Protocol/DevicePath.h>
#include <Protocol/SpiHc.h>
#include <Library/SpiHcPlatformLib.h>

Go to the source code of this file.

Functions
EFI_STATUS EFIAPI	GetPlatformSpiHcDetails (OUT UINT32 *Attributes, OUT UINT32 *FrameSizeSupportMask, OUT UINT32 *MaximumTransferBytes)
EFI_STATUS EFIAPI	GetSpiHcDevicePath (OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath)
EFI_STATUS EFIAPI	PlatformSpiHcChipSelect (IN CONST EFI_SPI_HC_PROTOCOL *This, IN CONST EFI_SPI_PERIPHERAL *SpiPeripheral, IN BOOLEAN PinValue)
EFI_STATUS EFIAPI	PlatformSpiHcClock (IN CONST EFI_SPI_HC_PROTOCOL *This, IN CONST EFI_SPI_PERIPHERAL *SpiPeripheral, IN UINT32 *ClockHz)
EFI_STATUS EFIAPI	PlatformSpiHcTransaction (IN CONST EFI_SPI_HC_PROTOCOL *This, IN EFI_SPI_BUS_TRANSACTION *BusTransaction)

Detailed Description

Null implementation of SpiHcPlatformLib

Copyright (C) 2024 Advanced Micro Devices, Inc. All rights reserved.
SPDX-License-Identifier: BSD-2-Clause-Patent

Definition in file BaseSpiHcPlatformLibNull.c.

Function Documentation

GetPlatformSpiHcDetails()

EFI_STATUS EFIAPI GetPlatformSpiHcDetails	(	OUT UINT32 *	Attributes,
		OUT UINT32 *	FrameSizeSupportMask,
		OUT UINT32 *	MaximumTransferBytes
	)

This function reports the details of the SPI Host Controller to the SpiHc driver.

Parameters

[out]	Attributes	The suported attributes of the SPI host controller
[out]	FrameSizeSupportMask	The suported FrameSizeSupportMask of the SPI host controller
[out]	MaximumTransferBytes	The suported MaximumTransferBytes of the SPI host controller

Return values

EFI_UNSUPPORTED

Definition at line 25 of file BaseSpiHcPlatformLibNull.c.

GetSpiHcDevicePath()

EFI_STATUS EFIAPI GetSpiHcDevicePath

(

OUT EFI_DEVICE_PATH_PROTOCOL **

DevicePath

)

This function reports the device path of SPI host controller. This is needed in order for the SpiBus to match the correct SPI_BUS to the SPI host controller

Parameters

[out]

DevicePath

The device path for this SPI HC is returned in this variable

Return values

EFI_UNSUPPORTED

Definition at line 44 of file BaseSpiHcPlatformLibNull.c.

PlatformSpiHcChipSelect()

EFI_STATUS EFIAPI PlatformSpiHcChipSelect	(	IN CONST EFI_SPI_HC_PROTOCOL *	This,
		IN CONST EFI_SPI_PERIPHERAL *	SpiPeripheral,
		IN BOOLEAN	PinValue
	)

This is the platform specific Spi Chip select function. Assert or deassert the SPI chip select.

This routine is called at TPL_NOTIFY. Update the value of the chip select line for a SPI peripheral. The SPI bus layer calls this routine either in the board layer or in the SPI controller to manipulate the chip select pin at the start and end of a SPI transaction.

Parameters

[in]	This	Pointer to an EFI_SPI_HC_PROTOCOL structure.
[in]	SpiPeripheral	The address of an EFI_SPI_PERIPHERAL data structure describing the SPI peripheral whose chip select pin is to be manipulated. The routine may access the ChipSelectParameter field to gain sufficient context to complete the operati on.
[in]	PinValue	The value to be applied to the chip select line of the SPI peripheral.

Return values

EFI_UNSUPPORTED

Definition at line 74 of file BaseSpiHcPlatformLibNull.c.

PlatformSpiHcClock()

EFI_STATUS EFIAPI PlatformSpiHcClock	(	IN CONST EFI_SPI_HC_PROTOCOL *	This,
		IN CONST EFI_SPI_PERIPHERAL *	SpiPeripheral,
		IN UINT32 *	ClockHz
	)

This function is the platform specific SPI clock function. Set up the clock generator to produce the correct clock frequency, phase and polarity for a SPI chip.

This routine is called at TPL_NOTIFY. This routine updates the clock generator to generate the correct frequency and polarity for the SPI clock.

Parameters

[in]	This	Pointer to an EFI_SPI_HC_PROTOCOL structure.
[in]	SpiPeripheral	Pointer to a EFI_SPI_PERIPHERAL data structure from which the routine can access the ClockParameter, ClockPhase and ClockPolarity fields. The routine also has access to the names for the SPI bus and chip which can be used during debugging.
[in]	ClockHz	Pointer to the requested clock frequency. The SPI host controller will choose a supported clock frequency which is less then or equal to this value. Specify zero to turn the clock generator off. The actual clock frequency supported by the SPI host controller will be returned.

Return values

EFI_UNSUPPORTED

Definition at line 110 of file BaseSpiHcPlatformLibNull.c.

PlatformSpiHcTransaction()

EFI_STATUS EFIAPI PlatformSpiHcTransaction	(	IN CONST EFI_SPI_HC_PROTOCOL *	This,
		IN EFI_SPI_BUS_TRANSACTION *	BusTransaction
	)

This function is the platform specific SPI transaction function Perform the SPI transaction on the SPI peripheral using the SPI host controller.

This routine is called at TPL_NOTIFY. This routine synchronously returns EFI_SUCCESS indicating that the asynchronous SPI transaction was started. The routine then waits for completion of the SPI transaction prior to returning the final transaction status.

Parameters

[in]	This	Pointer to an EFI_SPI_HC_PROTOCOL structure.
[in]	BusTransaction	Pointer to a EFI_SPI_BUS_ TRANSACTION containing the description of the SPI transaction to perform.

Return values

EFI_UNSUPPORTED

Definition at line 139 of file BaseSpiHcPlatformLibNull.c.