cc726b9ffd
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9694 6f19259b-4bc3-4df7-8a09-765794883524
378 lines
12 KiB
C
378 lines
12 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.
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All rights reserved. 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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//
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// Get Base Address of timer block from platform .DSC file
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//
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#define TIMER_BASE ((UINTN)FixedPcdGet32 (PcdTimerBaseAddress) + 0x00c0)
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#define TIMER_CMD ((UINTN)FixedPcdGet32 (PcdTimerBaseAddress) + 0x00000004)
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#define TIMER_DATA ((UINTN)FixedPcdGet32 (PcdTimerBaseAddress) + 0x00000008)
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//
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// The notification function to call on every timer interrupt.
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// A bug in the compiler prevents us from initializing this here.
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//
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volatile EFI_TIMER_NOTIFY mTimerNotifyFunction;
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//
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// The current period of the timer interrupt
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//
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volatile UINT64 mTimerPeriod = 0;
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//
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// Cached copy of the Hardware Interrupt protocol instance
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//
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EFI_HARDWARE_INTERRUPT_PROTOCOL *gInterrupt = NULL;
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/**
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C Interrupt Handler calledin 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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MmioWrite32 (TIMER_CMD, 0);
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if (mTimerNotifyFunction) {
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mTimerNotifyFunction (mTimerPeriod);
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}
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// restore state
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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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//
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// Check for invalid parameters
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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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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 TimerCount;
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if (TimerPeriod == 0) {
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//
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// Disable interrupt 0 and timer
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//
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MmioAnd32 (TIMER_DATA, 0);
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Status = gInterrupt->DisableInterruptSource (gInterrupt, FixedPcdGet32 (PcdTimerVector));
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} else {
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//
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// Convert TimerPeriod into Timer F counts
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//
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TimerCount = DivU64x32 (TimerPeriod + 5, 10);
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//
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// Program Timer F with the new count value
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//
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MmioWrite32 (TIMER_DATA, (UINT32)TimerCount);
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//
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// Enable interrupt and initialize and enable timer.
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//
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MmioOr32 (TIMER_CMD, 0x11);
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Status = gInterrupt->EnableInterruptSource (gInterrupt, FixedPcdGet32 (PcdTimerVector));
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}
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//
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// Save the new timer period
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//
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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 stucture 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
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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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EFI_HANDLE gTimerHandle = NULL;
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/**
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Initialize the state information for the Timer Architectural Protocol
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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_STATUS Status;
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//
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// Find the interrupt controller protocol. ASSERT if not found.
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//
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Status = gBS->LocateProtocol (&gHardwareInterruptProtocolGuid, NULL, ( VOID ** )&gInterrupt);
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ASSERT_EFI_ERROR (Status);
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MmioWrite32 (TIMER_CMD, 0x01);
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//
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// Force the timer to be disabled
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//
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Status = TimerDriverSetTimerPeriod (&gTimer, 0);
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ASSERT_EFI_ERROR (Status);
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//
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// Install interrupt handler
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//
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Status = gInterrupt->RegisterInterruptSource (gInterrupt, FixedPcdGet32 (PcdTimerVector), TimerInterruptHandler);
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ASSERT_EFI_ERROR (Status);
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//
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// Force the timer to be enabled at its default period
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//
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Status = TimerDriverSetTimerPeriod (&gTimer, FixedPcdGet32 (PcdTimerPeriod));
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ASSERT_EFI_ERROR (Status);
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//
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// Install the Timer Architectural Protocol onto a new handle
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//
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Status = gBS->InstallMultipleProtocolInterfaces (
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&gTimerHandle,
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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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return Status;
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}
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