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/** @file
Ksc settings in PEI phase.
Copyright (c) 1999 - 2015, Intel Corporation. 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 "PeiKsc.h"
//
// Function implemenations
//
/**
The PEI function requires CPU IO protocol, through which it reads KSC Command port
and ensures that EC exists or not.
Retval EFI_SUCCESS EC found and KscLib is successfully initialized.
Retval EFI_DEVICE_ERROR EC is NOT present on the system.
**/
EFI_STATUS
InitializeKscLib ( )
{
//
// Read from EC Command/Status port (0x66), if value is 0xFF means EC dose not exist.
//
if (IoRead8 (KSC_C_PORT) == 0xFF) {
return EFI_DEVICE_ERROR;
}
return EFI_SUCCESS;
}
/**
Sends command to Keyboard System Controller.
@param[in] Command Command byte to send
@retval EFI_SUCCESS Command success
@retval EFI_DEVICE_ERROR Command error
@retval EFI_TIMEOUT Command timeout
**/
EFI_STATUS
SendKscCommand (
IN UINT8 Command
)
{
UINTN Index = 0;
UINT8 KscStatus = 0;
//
// Wait for KSC to be ready (with a timeout)
//
ReceiveKscStatus (&KscStatus);
while (((KscStatus & KSC_S_IBF) != 0) && (Index < KSC_TIME_OUT)) {
ReceiveKscStatus (&KscStatus);
Index++;
}
if (Index >= KSC_TIME_OUT) {
DEBUG ((EFI_D_INFO, "SendKscCommand Time Out Error\n"));
return EFI_TIMEOUT;
}
//
// Send the KSC command
//
IoWrite8 (KSC_C_PORT, Command);
return EFI_SUCCESS;
}
/**
Receives status from Keyboard System Controller.
@param[out] KscStatus Status byte to receive
@retval EFI_DEVICE_ERROR Ksc library has not initialized yet or KSC not present
@retval EFI_SUCCESS Get KSC status successfully
**/
EFI_STATUS
ReceiveKscStatus (
OUT UINT8 *KscStatus
)
{
*KscStatus = IoRead8 (KSC_C_PORT);
return EFI_SUCCESS;
}
/**
Sends data to Keyboard System Controller.
@param[in] Data Data byte to send
@retval EFI_SUCCESS Success
@retval EFI_DEVICE_ERROR Error
@retval EFI_TIMEOUT Command timeout
**/
EFI_STATUS
SendKscData (
IN UINT8 Data
)
{
UINTN Index = 0;
UINT8 KscStatus = 0;
//
// Wait for KSC to be ready (with a timeout)
//
ReceiveKscStatus (&KscStatus);
while (((KscStatus & KSC_S_IBF) != 0) && (Index < KSC_TIME_OUT)) {
ReceiveKscStatus (&KscStatus);
Index++;
}
if (Index >= KSC_TIME_OUT) {
DEBUG ((EFI_D_INFO, "SendKscData Time Out Error\n"));
return EFI_TIMEOUT;
}
//
// Write Data at EC Port (0x62)
//
IoWrite8 (KSC_D_PORT, Data);
return EFI_SUCCESS;
}
/**
Receives data from Keyboard System Controller.
@param[out] Data Data byte received
@retval EFI_SUCCESS Read success
@retval EFI_DEVICE_ERROR Read error
@retval EFI_TIMEOUT Command timeout
**/
EFI_STATUS
ReceiveKscData (
OUT UINT8 *Data
)
{
UINTN Index = 0;
UINT8 KscStatus = 0;
//
// Wait for KSC to be ready (with a timeout)
//
ReceiveKscStatus (&KscStatus);
while (((KscStatus & KSC_S_OBF) == 0) && (Index < KSC_TIME_OUT)) {
ReceiveKscStatus (&KscStatus);
Index++;
}
if (Index >= KSC_TIME_OUT) {
DEBUG ((EFI_D_INFO, "ReceiveKscData Time Out Error\n"));
return EFI_TIMEOUT;
}
//
// Read KSC data and return
//
*Data = IoRead8 (KSC_D_PORT);
return EFI_SUCCESS;
}
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