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/** @file
Template for Timer Architecture Protocol driver of the ARM flavor
Copyright (c) 2008-2009, Apple Inc. All rights reserved.
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/DebugLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include <Library/PcdLib.h>
#include <Library/IoLib.h>
#include <Library/OmapLib.h>
#include <Protocol/Timer.h>
#include <Protocol/HardwareInterrupt.h>
#include <Protocol/TimerDebugSupport.h>
#include <Omap3530/Omap3530.h>
// The notification function to call on every timer interrupt.
volatile EFI_TIMER_NOTIFY mTimerNotifyFunction = (EFI_TIMER_NOTIFY)NULL;
volatile EFI_PERIODIC_CALLBACK mTimerPeriodicCallback = (EFI_PERIODIC_CALLBACK)NULL;
// The current period of the timer interrupt
volatile UINT64 mTimerPeriod = 0;
// Cached copy of the Hardware Interrupt protocol instance
EFI_HARDWARE_INTERRUPT_PROTOCOL *gInterrupt = NULL;
// Cached registers
volatile UINT32 TISR;
volatile UINT32 TCLR;
volatile UINT32 TLDR;
volatile UINT32 TCRR;
volatile UINT32 TIER;
// Cached interrupt vector
volatile UINTN gVector;
VOID
EFIAPI
TimerInterruptHandler (
IN HARDWARE_INTERRUPT_SOURCE Source,
IN EFI_SYSTEM_CONTEXT SystemContext
)
{
if (mTimerPeriodicCallback) {
mTimerPeriodicCallback(SystemContext);
}
if (mTimerNotifyFunction) {
mTimerNotifyFunction(mTimerPeriod);
}
// Clear all timer interrupts
MmioWrite32(TISR, TISR_CLEAR_ALL);
// Poll interrupt status bits to ensure clearing
while ((MmioRead32(TISR) & TISR_ALL_INTERRUPT_MASK) != TISR_NO_INTERRUPTS_PENDING);
}
EFI_STATUS
EFIAPI
TimerDriverRegisterHandler (
IN EFI_TIMER_ARCH_PROTOCOL *This,
IN EFI_TIMER_NOTIFY NotifyFunction
)
{
if ((NotifyFunction == NULL) && (mTimerNotifyFunction == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((NotifyFunction != NULL) && (mTimerNotifyFunction != NULL)) {
return EFI_ALREADY_STARTED;
}
mTimerNotifyFunction = NotifyFunction;
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
TimerDriverSetTimerPeriod (
IN EFI_TIMER_ARCH_PROTOCOL *This,
IN UINT64 TimerPeriod
)
{
EFI_STATUS Status;
UINT64 TimerCount;
INT32 LoadValue;
if (TimerPeriod == 0) {
// Turn off GPTIMER3
MmioWrite32(TCLR, TCLR_ST_OFF);
Status = gInterrupt->DisableInterruptSource(gInterrupt, gVector);
} else {
// Calculate required timer count
TimerCount = DivU64x32(TimerPeriod * 100, PcdGet32(PcdEmbeddedFdPerformanceCounterPeriodInNanoseconds));
// Set GPTIMER3 Load register
LoadValue = (INT32) -TimerCount;
MmioWrite32(TLDR, LoadValue);
MmioWrite32(TCRR, LoadValue);
// Enable Overflow interrupt
MmioWrite32(TIER, TIER_TCAR_IT_DISABLE | TIER_OVF_IT_ENABLE | TIER_MAT_IT_DISABLE);
// Turn on GPTIMER3, it will reload at overflow
MmioWrite32(TCLR, TCLR_AR_AUTORELOAD | TCLR_ST_ON);
Status = gInterrupt->EnableInterruptSource(gInterrupt, gVector);
}
//
// Save the new timer period
//
mTimerPeriod = TimerPeriod;
return Status;
}
EFI_STATUS
EFIAPI
TimerDriverGetTimerPeriod (
IN EFI_TIMER_ARCH_PROTOCOL *This,
OUT UINT64 *TimerPeriod
)
{
if (TimerPeriod == NULL) {
return EFI_INVALID_PARAMETER;
}
*TimerPeriod = mTimerPeriod;
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
TimerDriverGenerateSoftInterrupt (
IN EFI_TIMER_ARCH_PROTOCOL *This
)
{
return EFI_UNSUPPORTED;
}
EFI_STATUS
EFIAPI
TimerDriverRegisterPeriodicCallback (
IN TIMER_DEBUG_SUPPORT_PROTOCOL *This,
IN EFI_PERIODIC_CALLBACK PeriodicCallback
)
{
if ((PeriodicCallback == NULL) && (mTimerPeriodicCallback == NULL)) {
return EFI_INVALID_PARAMETER;
}
if ((PeriodicCallback != NULL) && (mTimerPeriodicCallback != NULL)) {
return EFI_ALREADY_STARTED;
}
mTimerPeriodicCallback = PeriodicCallback;
return EFI_SUCCESS;
}
EFI_TIMER_ARCH_PROTOCOL gTimer = {
TimerDriverRegisterHandler,
TimerDriverSetTimerPeriod,
TimerDriverGetTimerPeriod,
TimerDriverGenerateSoftInterrupt
};
TIMER_DEBUG_SUPPORT_PROTOCOL gTimerDebugSupport = {
TimerDriverRegisterPeriodicCallback
};
EFI_STATUS
EFIAPI
TimerInitialize (
IN EFI_HANDLE ImageHandle,
IN EFI_SYSTEM_TABLE *SystemTable
)
{
EFI_HANDLE Handle = NULL;
EFI_STATUS Status;
UINT32 TimerBaseAddress;
// Find the interrupt controller protocol. ASSERT if not found.
Status = gBS->LocateProtocol(&gHardwareInterruptProtocolGuid, NULL, (VOID **)&gInterrupt);
ASSERT_EFI_ERROR (Status);
// Set up the timer registers
TimerBaseAddress = TimerBase(FixedPcdGet32(PcdBeagleArchTimer));
TISR = TimerBaseAddress + GPTIMER_TISR;
TCLR = TimerBaseAddress + GPTIMER_TCLR;
TLDR = TimerBaseAddress + GPTIMER_TLDR;
TCRR = TimerBaseAddress + GPTIMER_TCRR;
TIER = TimerBaseAddress + GPTIMER_TIER;
// Disable the timer
Status = TimerDriverSetTimerPeriod(&gTimer, 0);
ASSERT_EFI_ERROR (Status);
// Install interrupt handler
gVector = InterruptVectorForTimer(FixedPcdGet32(PcdBeagleArchTimer));
Status = gInterrupt->RegisterInterruptSource(gInterrupt, gVector, TimerInterruptHandler);
ASSERT_EFI_ERROR (Status);
// Set up default timer
Status = TimerDriverSetTimerPeriod(&gTimer, FixedPcdGet32(PcdTimerPeriod));
ASSERT_EFI_ERROR (Status);
// Install the Timer Architectural Protocol onto a new handle
Status = gBS->InstallMultipleProtocolInterfaces(&Handle,
&gEfiTimerArchProtocolGuid, &gTimer,
&gTimerDebugSupportProtocolGuid, &gTimerDebugSupport,
NULL);
ASSERT_EFI_ERROR(Status);
return Status;
}
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