3402aac7d9
Trailing spaces create issue/warning when generating/applying patches. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Ronald Cron <ronald.cron@arm.com> Reviewed-By: Olivier Martin <olivier.martin@arm.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15833 6f19259b-4bc3-4df7-8a09-765794883524
396 lines
15 KiB
C
396 lines
15 KiB
C
/** @file
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Template for Timer Architecture Protocol driver of the ARM flavor
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Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
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Copyright (c) 2011 - 2012, ARM Ltd. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include <PiDxe.h>
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#include <Library/BaseLib.h>
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#include <Library/DebugLib.h>
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#include <Library/BaseMemoryLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Library/UefiLib.h>
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#include <Library/PcdLib.h>
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#include <Library/IoLib.h>
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#include <Protocol/Timer.h>
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#include <Protocol/HardwareInterrupt.h>
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#include <Drivers/SP804Timer.h>
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#define SP804_TIMER_PERIODIC_BASE ((UINTN)PcdGet32 (PcdSP804TimerPeriodicBase))
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#define SP804_TIMER_METRONOME_BASE ((UINTN)PcdGet32 (PcdSP804TimerMetronomeBase))
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#define SP804_TIMER_PERFORMANCE_BASE ((UINTN)PcdGet32 (PcdSP804TimerPerformanceBase))
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// The notification function to call on every timer interrupt.
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EFI_TIMER_NOTIFY mTimerNotifyFunction = (EFI_TIMER_NOTIFY)NULL;
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EFI_EVENT EfiExitBootServicesEvent = (EFI_EVENT)NULL;
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// The current period of the timer interrupt
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UINT64 mTimerPeriod = 0;
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// Cached copy of the Hardware Interrupt protocol instance
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EFI_HARDWARE_INTERRUPT_PROTOCOL *gInterrupt = NULL;
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// Cached interrupt vector
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UINTN gVector;
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/**
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C Interrupt Handler called in the interrupt context when Source interrupt is active.
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@param Source Source of the interrupt. Hardware routing off a specific platform defines
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what source means.
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@param SystemContext Pointer to system register context. Mostly used by debuggers and will
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update the system context after the return from the interrupt if
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modified. Don't change these values unless you know what you are doing
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**/
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VOID
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EFIAPI
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TimerInterruptHandler (
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IN HARDWARE_INTERRUPT_SOURCE Source,
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IN EFI_SYSTEM_CONTEXT SystemContext
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)
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{
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EFI_TPL OriginalTPL;
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//
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// DXE core uses this callback for the EFI timer tick. The DXE core uses locks
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// that raise to TPL_HIGH and then restore back to current level. Thus we need
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// to make sure TPL level is set to TPL_HIGH while we are handling the timer tick.
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//
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OriginalTPL = gBS->RaiseTPL (TPL_HIGH_LEVEL);
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// If the interrupt is shared then we must check if this interrupt source is the one associated to this Timer
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if (MmioRead32 (SP804_TIMER_PERIODIC_BASE + SP804_TIMER_MSK_INT_STS_REG) != 0) {
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// Clear the periodic interrupt
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MmioWrite32 (SP804_TIMER_PERIODIC_BASE + SP804_TIMER_INT_CLR_REG, 0);
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// Signal end of interrupt early to help avoid losing subsequent ticks from long duration handlers
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gInterrupt->EndOfInterrupt (gInterrupt, Source);
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if (mTimerNotifyFunction) {
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mTimerNotifyFunction (mTimerPeriod);
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}
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}
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gBS->RestoreTPL (OriginalTPL);
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}
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/**
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This function registers the handler NotifyFunction so it is called every time
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the timer interrupt fires. It also passes the amount of time since the last
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handler call to the NotifyFunction. If NotifyFunction is NULL, then the
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handler is unregistered. If the handler is registered, then EFI_SUCCESS is
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returned. If the CPU does not support registering a timer interrupt handler,
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then EFI_UNSUPPORTED is returned. If an attempt is made to register a handler
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when a handler is already registered, then EFI_ALREADY_STARTED is returned.
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If an attempt is made to unregister a handler when a handler is not registered,
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then EFI_INVALID_PARAMETER is returned. If an error occurs attempting to
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register the NotifyFunction with the timer interrupt, then EFI_DEVICE_ERROR
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is returned.
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@param This The EFI_TIMER_ARCH_PROTOCOL instance.
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@param NotifyFunction The function to call when a timer interrupt fires. This
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function executes at TPL_HIGH_LEVEL. The DXE Core will
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register a handler for the timer interrupt, so it can know
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how much time has passed. This information is used to
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signal timer based events. NULL will unregister the handler.
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@retval EFI_SUCCESS The timer handler was registered.
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@retval EFI_UNSUPPORTED The platform does not support timer interrupts.
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@retval EFI_ALREADY_STARTED NotifyFunction is not NULL, and a handler is already
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registered.
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@retval EFI_INVALID_PARAMETER NotifyFunction is NULL, and a handler was not
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previously registered.
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@retval EFI_DEVICE_ERROR The timer handler could not be registered.
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**/
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EFI_STATUS
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EFIAPI
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TimerDriverRegisterHandler (
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IN EFI_TIMER_ARCH_PROTOCOL *This,
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IN EFI_TIMER_NOTIFY NotifyFunction
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)
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{
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if ((NotifyFunction == NULL) && (mTimerNotifyFunction == NULL)) {
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return EFI_INVALID_PARAMETER;
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}
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if ((NotifyFunction != NULL) && (mTimerNotifyFunction != NULL)) {
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return EFI_ALREADY_STARTED;
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}
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mTimerNotifyFunction = NotifyFunction;
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return EFI_SUCCESS;
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}
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/**
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Make sure all Dual Timers are disabled
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**/
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VOID
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EFIAPI
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ExitBootServicesEvent (
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IN EFI_EVENT Event,
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IN VOID *Context
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)
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{
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// Disable 'Periodic Operation' timer if enabled
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if (MmioRead32(SP804_TIMER_PERIODIC_BASE + SP804_TIMER_CONTROL_REG) & SP804_TIMER_CTRL_ENABLE) {
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MmioAnd32 (SP804_TIMER_PERIODIC_BASE + SP804_TIMER_CONTROL_REG, 0);
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}
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// Disable 'Metronome/Delay' timer if enabled
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if (MmioRead32(SP804_TIMER_METRONOME_BASE + SP804_TIMER_CONTROL_REG) & SP804_TIMER_CTRL_ENABLE) {
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MmioAnd32 (SP804_TIMER_METRONOME_BASE + SP804_TIMER_CONTROL_REG, 0);
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}
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// Disable 'Performance' timer if enabled
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if (MmioRead32(SP804_TIMER_PERFORMANCE_BASE + SP804_TIMER_CONTROL_REG) & SP804_TIMER_CTRL_ENABLE) {
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MmioAnd32 (SP804_TIMER_PERFORMANCE_BASE + SP804_TIMER_CONTROL_REG, 0);
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}
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}
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/**
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This function adjusts the period of timer interrupts to the value specified
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by TimerPeriod. If the timer period is updated, then the selected timer
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period is stored in EFI_TIMER.TimerPeriod, and EFI_SUCCESS is returned. If
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the timer hardware is not programmable, then EFI_UNSUPPORTED is returned.
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If an error occurs while attempting to update the timer period, then the
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timer hardware will be put back in its state prior to this call, and
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EFI_DEVICE_ERROR is returned. If TimerPeriod is 0, then the timer interrupt
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is disabled. This is not the same as disabling the CPU's interrupts.
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Instead, it must either turn off the timer hardware, or it must adjust the
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interrupt controller so that a CPU interrupt is not generated when the timer
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interrupt fires.
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@param This The EFI_TIMER_ARCH_PROTOCOL instance.
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@param TimerPeriod The rate to program the timer interrupt in 100 nS units. If
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the timer hardware is not programmable, then EFI_UNSUPPORTED is
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returned. If the timer is programmable, then the timer period
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will be rounded up to the nearest timer period that is supported
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by the timer hardware. If TimerPeriod is set to 0, then the
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timer interrupts will be disabled.
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@retval EFI_SUCCESS The timer period was changed.
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@retval EFI_UNSUPPORTED The platform cannot change the period of the timer interrupt.
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@retval EFI_DEVICE_ERROR The timer period could not be changed due to a device error.
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**/
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EFI_STATUS
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EFIAPI
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TimerDriverSetTimerPeriod (
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IN EFI_TIMER_ARCH_PROTOCOL *This,
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IN UINT64 TimerPeriod
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)
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{
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EFI_STATUS Status;
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UINT64 TimerTicks;
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// always disable the timer
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MmioAnd32 (SP804_TIMER_PERIODIC_BASE + SP804_TIMER_CONTROL_REG, ~SP804_TIMER_CTRL_ENABLE);
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if (TimerPeriod == 0) {
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// Leave timer disabled from above, and...
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// Disable timer 0/1 interrupt for a TimerPeriod of 0
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Status = gInterrupt->DisableInterruptSource (gInterrupt, gVector);
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} else {
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// Convert TimerPeriod into 1MHz clock counts (us units = 100ns units * 10)
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TimerTicks = DivU64x32 (TimerPeriod, 10);
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TimerTicks = MultU64x32 (TimerTicks, PcdGet32(PcdSP804TimerFrequencyInMHz));
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// if it's larger than 32-bits, pin to highest value
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if (TimerTicks > 0xffffffff) {
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TimerTicks = 0xffffffff;
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}
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// Program the SP804 timer with the new count value
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MmioWrite32 (SP804_TIMER_PERIODIC_BASE + SP804_TIMER_LOAD_REG, TimerTicks);
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// enable the timer
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MmioOr32 (SP804_TIMER_PERIODIC_BASE + SP804_TIMER_CONTROL_REG, SP804_TIMER_CTRL_ENABLE);
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// enable timer 0/1 interrupts
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Status = gInterrupt->EnableInterruptSource (gInterrupt, gVector);
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}
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// Save the new timer period
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mTimerPeriod = TimerPeriod;
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return Status;
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}
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/**
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This function retrieves the period of timer interrupts in 100 ns units,
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returns that value in TimerPeriod, and returns EFI_SUCCESS. If TimerPeriod
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is NULL, then EFI_INVALID_PARAMETER is returned. If a TimerPeriod of 0 is
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returned, then the timer is currently disabled.
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@param This The EFI_TIMER_ARCH_PROTOCOL instance.
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@param TimerPeriod A pointer to the timer period to retrieve in 100 ns units. If
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0 is returned, then the timer is currently disabled.
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@retval EFI_SUCCESS The timer period was returned in TimerPeriod.
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@retval EFI_INVALID_PARAMETER TimerPeriod is NULL.
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**/
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EFI_STATUS
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EFIAPI
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TimerDriverGetTimerPeriod (
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IN EFI_TIMER_ARCH_PROTOCOL *This,
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OUT UINT64 *TimerPeriod
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)
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{
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if (TimerPeriod == NULL) {
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return EFI_INVALID_PARAMETER;
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}
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*TimerPeriod = mTimerPeriod;
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return EFI_SUCCESS;
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}
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/**
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This function generates a soft timer interrupt. If the platform does not support soft
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timer interrupts, then EFI_UNSUPPORTED is returned. Otherwise, EFI_SUCCESS is returned.
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If a handler has been registered through the EFI_TIMER_ARCH_PROTOCOL.RegisterHandler()
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service, then a soft timer interrupt will be generated. If the timer interrupt is
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enabled when this service is called, then the registered handler will be invoked. The
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registered handler should not be able to distinguish a hardware-generated timer
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interrupt from a software-generated timer interrupt.
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@param This The EFI_TIMER_ARCH_PROTOCOL instance.
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@retval EFI_SUCCESS The soft timer interrupt was generated.
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@retval EFI_UNSUPPORTED The platform does not support the generation of soft timer interrupts.
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**/
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EFI_STATUS
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EFIAPI
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TimerDriverGenerateSoftInterrupt (
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IN EFI_TIMER_ARCH_PROTOCOL *This
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)
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{
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return EFI_UNSUPPORTED;
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}
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/**
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Interface structure for the Timer Architectural Protocol.
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@par Protocol Description:
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This protocol provides the services to initialize a periodic timer
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interrupt, and to register a handler that is called each time the timer
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interrupt fires. It may also provide a service to adjust the rate of the
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periodic timer interrupt. When a timer interrupt occurs, the handler is
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passed the amount of time that has passed since the previous timer
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interrupt.
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@param RegisterHandler
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Registers a handler that will be called each time the
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timer interrupt fires. TimerPeriod defines the minimum
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time between timer interrupts, so TimerPeriod will also
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be the minimum time between calls to the registered
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handler.
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@param SetTimerPeriod
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Sets the period of the timer interrupt in 100 nS units.
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This function is optional, and may return EFI_UNSUPPORTED.
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If this function is supported, then the timer period will
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be rounded up to the nearest supported timer period.
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@param GetTimerPeriod
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Retrieves the period of the timer interrupt in 100 nS units.
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@param GenerateSoftInterrupt
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Generates a soft timer interrupt that simulates the firing of
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the timer interrupt. This service can be used to invoke the registered handler if the timer interrupt has been masked for
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a period of time.
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**/
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EFI_TIMER_ARCH_PROTOCOL gTimer = {
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TimerDriverRegisterHandler,
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TimerDriverSetTimerPeriod,
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TimerDriverGetTimerPeriod,
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TimerDriverGenerateSoftInterrupt
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};
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/**
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Initialize the state information for the Timer Architectural Protocol and
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the Timer Debug support protocol that allows the debugger to break into a
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running program.
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@param ImageHandle of the loaded driver
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@param SystemTable Pointer to the System Table
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@retval EFI_SUCCESS Protocol registered
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@retval EFI_OUT_OF_RESOURCES Cannot allocate protocol data structure
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@retval EFI_DEVICE_ERROR Hardware problems
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**/
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EFI_STATUS
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EFIAPI
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TimerInitialize (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_HANDLE Handle = NULL;
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EFI_STATUS Status;
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// Set the interrupt timer number
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gVector = PcdGet32(PcdSP804TimerPeriodicInterruptNum);
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// Find the interrupt controller protocol. ASSERT if not found.
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Status = gBS->LocateProtocol (&gHardwareInterruptProtocolGuid, NULL, (VOID **)&gInterrupt);
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ASSERT_EFI_ERROR (Status);
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// Disable the timer
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Status = TimerDriverSetTimerPeriod (&gTimer, 0);
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ASSERT_EFI_ERROR (Status);
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// Install interrupt handler
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Status = gInterrupt->RegisterInterruptSource (gInterrupt, gVector, TimerInterruptHandler);
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ASSERT_EFI_ERROR (Status);
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// configure timer 0 for periodic operation, 32 bits, no prescaler, and interrupt enabled
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MmioWrite32 (SP804_TIMER_PERIODIC_BASE + SP804_TIMER_CONTROL_REG, SP804_TIMER_CTRL_PERIODIC | SP804_TIMER_CTRL_32BIT | SP804_PRESCALE_DIV_1 | SP804_TIMER_CTRL_INT_ENABLE);
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// Set up default timer
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Status = TimerDriverSetTimerPeriod (&gTimer, FixedPcdGet32(PcdTimerPeriod)); // TIMER_DEFAULT_PERIOD
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ASSERT_EFI_ERROR (Status);
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// Install the Timer Architectural Protocol onto a new handle
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Status = gBS->InstallMultipleProtocolInterfaces(
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&Handle,
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&gEfiTimerArchProtocolGuid, &gTimer,
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NULL
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);
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ASSERT_EFI_ERROR(Status);
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// Register for an ExitBootServicesEvent
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Status = gBS->CreateEvent (EVT_SIGNAL_EXIT_BOOT_SERVICES, TPL_NOTIFY, ExitBootServicesEvent, NULL, &EfiExitBootServicesEvent);
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ASSERT_EFI_ERROR (Status);
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return Status;
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}
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