ArmPlatformPkg/Drivers/PL061GpioDxe/PL061Gpio.c
/** @file
*
* Copyright (c) 2011, ARM Limited. All rights reserved.
*
* 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/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/IoLib.h>
#include <Library/PcdLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include <Protocol/EmbeddedGpio.h>
#include <Drivers/PL061Gpio.h>
BOOLEAN mPL061Initialized = FALSE;
/**
Function implementations
**/
EFI_STATUS
PL061Identify (
VOID
)
{
// Check if this is a PrimeCell Peripheral
if ( (MmioRead8 (PL061_GPIO_PCELL_ID0) != 0x0D)
|| (MmioRead8 (PL061_GPIO_PCELL_ID1) != 0xF0)
|| (MmioRead8 (PL061_GPIO_PCELL_ID2) != 0x05)
|| (MmioRead8 (PL061_GPIO_PCELL_ID3) != 0xB1)) {
return EFI_NOT_FOUND;
}
// Check if this PrimeCell Peripheral is the PL061 GPIO
if ( (MmioRead8 (PL061_GPIO_PERIPH_ID0) != 0x61)
|| (MmioRead8 (PL061_GPIO_PERIPH_ID1) != 0x10)
|| ((MmioRead8 (PL061_GPIO_PERIPH_ID2) & 0xF) != 0x04)
|| (MmioRead8 (PL061_GPIO_PERIPH_ID3) != 0x00)) {
return EFI_NOT_FOUND;
}
return EFI_SUCCESS;
}
EFI_STATUS
PL061Initialize (
VOID
)
{
EFI_STATUS Status;
// Check if the PL061 GPIO module exists on board
Status = PL061Identify();
if (EFI_ERROR (Status)) {
Status = EFI_DEVICE_ERROR;
goto EXIT;
}
// Do other hardware initialisation things here as required
// Disable Interrupts
//if (MmioRead8 (PL061_GPIO_IE_REG) != 0) {
// // Ensure interrupts are disabled
//}
mPL061Initialized = TRUE;
EXIT:
return Status;
}
/**
Routine Description:
Gets the state of a GPIO pin
Arguments:
This - pointer to protocol
Gpio - which pin to read
Value - state of the pin
Returns:
EFI_SUCCESS - GPIO state returned in Value
EFI_INVALID_PARAMETER - Value is NULL pointer or Gpio pin is out of range
**/
EFI_STATUS
EFIAPI
Get (
IN EMBEDDED_GPIO *This,
IN EMBEDDED_GPIO_PIN Gpio,
OUT UINTN *Value
)
{
EFI_STATUS Status = EFI_SUCCESS;
if ( (Value == NULL)
|| (Gpio > LAST_GPIO_PIN))
{
return EFI_INVALID_PARAMETER;
}
// Initialize the hardware if not already done
if (!mPL061Initialized) {
Status = PL061Initialize();
if (EFI_ERROR(Status)) {
goto EXIT;
}
}
if (MmioRead8 (PL061_GPIO_DATA_REG) & GPIO_PIN_MASK_HIGH_8BIT(Gpio)) {
*Value = 1;
} else {
*Value = 0;
}
EXIT:
return Status;
}
/**
Routine Description:
Sets the state of a GPIO pin
Arguments:
This - pointer to protocol
Gpio - which pin to modify
Mode - mode to set
Returns:
EFI_SUCCESS - GPIO set as requested
EFI_UNSUPPORTED - Mode is not supported
EFI_INVALID_PARAMETER - Gpio pin is out of range
**/
EFI_STATUS
EFIAPI
Set (
IN EMBEDDED_GPIO *This,
IN EMBEDDED_GPIO_PIN Gpio,
IN EMBEDDED_GPIO_MODE Mode
)
{
EFI_STATUS Status = EFI_SUCCESS;
// Check for errors
if (Gpio > LAST_GPIO_PIN) {
Status = EFI_INVALID_PARAMETER;
goto EXIT;
}
// Initialize the hardware if not already done
if (!mPL061Initialized) {
Status = PL061Initialize();
if (EFI_ERROR(Status)) {
goto EXIT;
}
}
switch (Mode)
{
case GPIO_MODE_INPUT:
// Set the corresponding direction bit to LOW for input
MmioAnd8 (PL061_GPIO_DIR_REG, GPIO_PIN_MASK_LOW_8BIT(Gpio));
break;
case GPIO_MODE_OUTPUT_0:
// Set the corresponding data bit to LOW for 0
MmioAnd8 (PL061_GPIO_DATA_REG, GPIO_PIN_MASK_LOW_8BIT(Gpio));
// Set the corresponding direction bit to HIGH for output
MmioOr8 (PL061_GPIO_DIR_REG, GPIO_PIN_MASK_HIGH_8BIT(Gpio));
break;
case GPIO_MODE_OUTPUT_1:
// Set the corresponding data bit to HIGH for 1
MmioOr8 (PL061_GPIO_DATA_REG, GPIO_PIN_MASK_HIGH_8BIT(Gpio));
// Set the corresponding direction bit to HIGH for output
MmioOr8 (PL061_GPIO_DIR_REG, GPIO_PIN_MASK_HIGH_8BIT(Gpio));
break;
default:
// Other modes are not supported
return EFI_UNSUPPORTED;
}
EXIT:
return Status;
}
/**
Routine Description:
Gets the mode (function) of a GPIO pin
Arguments:
This - pointer to protocol
Gpio - which pin
Mode - pointer to output mode value
Returns:
EFI_SUCCESS - mode value retrieved
EFI_INVALID_PARAMETER - Mode is a null pointer or Gpio pin is out of range
**/
EFI_STATUS
EFIAPI
GetMode (
IN EMBEDDED_GPIO *This,
IN EMBEDDED_GPIO_PIN Gpio,
OUT EMBEDDED_GPIO_MODE *Mode
)
{
EFI_STATUS Status;
// Check for errors
if ( (Mode == NULL)
|| (Gpio > LAST_GPIO_PIN)) {
return EFI_INVALID_PARAMETER;
}
// Initialize the hardware if not already done
if (!mPL061Initialized) {
Status = PL061Initialize();
if (EFI_ERROR(Status)) {
return Status;
}
}
// Check if it is input or output
if (MmioRead8 (PL061_GPIO_DIR_REG) & GPIO_PIN_MASK_HIGH_8BIT(Gpio)) {
// Pin set to output
if (MmioRead8 (PL061_GPIO_DATA_REG) & GPIO_PIN_MASK_HIGH_8BIT(Gpio)) {
*Mode = GPIO_MODE_OUTPUT_1;
} else {
*Mode = GPIO_MODE_OUTPUT_0;
}
} else {
// Pin set to input
*Mode = GPIO_MODE_INPUT;
}
return EFI_SUCCESS;
}
/**
Routine Description:
Sets the pull-up / pull-down resistor of a GPIO pin
Arguments:
This - pointer to protocol
Gpio - which pin
Direction - pull-up, pull-down, or none
Returns:
EFI_UNSUPPORTED - Can not perform the requested operation
**/
EFI_STATUS
EFIAPI
SetPull (
IN EMBEDDED_GPIO *This,
IN EMBEDDED_GPIO_PIN Gpio,
IN EMBEDDED_GPIO_PULL Direction
)
{
return EFI_UNSUPPORTED;
}
/**
Protocol variable definition
**/
EMBEDDED_GPIO gGpio = {
Get,
Set,
GetMode,
SetPull
};
/**
Initialize the state information for the Embedded Gpio protocol.
@param ImageHandle of the loaded driver
@param SystemTable Pointer to the System Table
@retval EFI_SUCCESS Protocol registered
@retval EFI_OUT_OF_RESOURCES Cannot allocate protocol data structure
@retval EFI_DEVICE_ERROR Hardware problems
**/
EFI_STATUS
EFIAPI
PL061InstallProtocol (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_STATUS Status;
EFI_HANDLE Handle;
//
// Make sure the Gpio protocol has not been installed in the system yet.
//
ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEmbeddedGpioProtocolGuid);
// Install the Embedded GPIO Protocol onto a new handle
Handle = NULL;
Status = gBS->InstallMultipleProtocolInterfaces(
&Handle,
&gEmbeddedGpioProtocolGuid, &gGpio,
NULL
);
if (EFI_ERROR(Status)) {
Status = EFI_OUT_OF_RESOURCES;
}
return Status;
}