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Kernel: Add interrupt support to aarch64 RPi Timer driver

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Since we can now build and use the IRQHandler class, we can implement
interrupt support for the Timer in the aarch64 build.
This commit is contained in:
Timon Kruiper 2022-05-30 10:22:57 +02:00 • committed by Linus Groh
parent 8b77c61e7d
commit dab6dbe893
2 changed files with 56 additions and 2 deletions
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38
Kernel/Arch/aarch64/RPi/Timer.cpp
View file

@ -30,7 +30,8 @@ enum FlagBits {
};
Timer::Timer()
: m_registers(MMIO::the().peripheral<TimerRegisters>(0x3000))
: IRQHandler(1)
, m_registers(MMIO::the().peripheral<TimerRegisters>(0x3000))
{
}
@ -51,6 +52,41 @@ u64 Timer::microseconds_since_boot()
return (static_cast<u64>(high) << 32) | low;
}
bool Timer::handle_irq(RegisterState const&)
{
dbgln("Timer fired: {} us", m_current_timer_value);
m_current_timer_value += m_interrupt_interval;
set_compare(TimerID::Timer1, m_current_timer_value);
clear_interrupt(TimerID::Timer1);
return true;
};
void Timer::enable_interrupt_mode()
{
m_current_timer_value = microseconds_since_boot();
m_current_timer_value += m_interrupt_interval;
set_compare(TimerID::Timer1, m_current_timer_value);
enable_irq();
}
void Timer::set_interrupt_interval_usec(u32 interrupt_interval)
{
m_interrupt_interval = interrupt_interval;
}
void Timer::clear_interrupt(TimerID id)
{
m_registers->control_and_status = 1 << to_underlying(id);
}
void Timer::set_compare(TimerID id, u32 compare)
{
m_registers->compare[to_underlying(id)] = compare;
}
class SetClockRateMboxMessage : Mailbox::Message {
public:
u32 clock_id;