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Kernel/aarch64: Implement HardwareTimer for RPi::Timer

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This makes the RPi::Timer suitable for use in the TimeManagement code.
This commit is contained in:
Timon Kruiper 2022-10-17 14:59:35 +02:00 • committed by Gunnar Beutner
parent de0bb99893
commit 83b95c135e
3 changed files with 77 additions and 19 deletions
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34
Kernel/Arch/aarch64/RPi/Timer.h
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@ -1,5 +1,6 @@
/*
* Copyright (c) 2021, Nico Weber <thakis@chromium.org>
* Copyright (c) 2022, Timon Kruiper <timonkruiper@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -8,15 +9,36 @@
#include <AK/Types.h>
#include <Kernel/Interrupts/IRQHandler.h>
#include <Kernel/Library/NonnullLockRefPtr.h>
#include <Kernel/Time/HardwareTimer.h>
namespace Kernel::RPi {
struct TimerRegisters;
class Timer : public IRQHandler {
class Timer final : public HardwareTimer<IRQHandler> {
public:
Timer();
static Timer& the();
virtual ~Timer();
static NonnullLockRefPtr<Timer> initialize();
virtual HardwareTimerType timer_type() const override { return HardwareTimerType::RPiTimer; }
virtual StringView model() const override { return "RPi Timer"sv; }
virtual size_t ticks_per_second() const override { return m_frequency; }
virtual bool is_periodic() const override { TODO_AARCH64(); }
virtual bool is_periodic_capable() const override { TODO_AARCH64(); }
virtual void set_periodic() override { TODO_AARCH64(); }
virtual void set_non_periodic() override { TODO_AARCH64(); }
virtual void disable() override { TODO_AARCH64(); }
virtual void reset_to_default_ticks_per_second() override { TODO_AARCH64(); }
virtual bool try_to_set_frequency(size_t) override { TODO_AARCH64(); }
virtual bool is_capable_of_frequency(size_t) const override { TODO_AARCH64(); }
virtual size_t calculate_nearest_possible_frequency(size_t) const override { TODO_AARCH64(); }
// FIXME: Share code with HPET::update_time
u64 update_time(u64& seconds_since_boot, u32& ticks_this_second, bool query_only);
u64 microseconds_since_boot();
@ -43,6 +65,8 @@ public:
static u32 set_clock_rate(ClockID, u32 rate_hz, bool skip_setting_turbo = true);
private:
Timer();
enum class TimerID : u32 {
Timer0 = 0,
Timer1 = 1,
@ -57,7 +81,9 @@ private:
TimerRegisters volatile* m_registers;
u32 m_interrupt_interval { 0 };
u32 m_current_timer_value { 0 };
u64 m_main_counter_last_read { 0 };
u64 m_main_counter_drift { 0 };
};
}