dd7633c5f4
While doing this, we can also just return a normal RefPtr instead of a LockRefPtr, because we create these channels when initializing an audio controller, and never change the pointer in AudioController instances after their initialization, hence no locking is necessary.
334 lines
14 KiB
C++
334 lines
14 KiB
C++
/*
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* Copyright (c) 2021-2022, Jelle Raaijmakers <jelle@gmta.nl>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Format.h>
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#include <Kernel/Arch/Delay.h>
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#include <Kernel/Devices/Audio/AC97.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/IOWindow.h>
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#include <Kernel/InterruptDisabler.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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namespace Kernel {
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static constexpr int buffer_descriptor_list_max_entries = 32;
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static constexpr u16 pcm_default_sample_rate = 44100;
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static constexpr u16 pcm_fixed_sample_rate = 48000;
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// Valid output range - with double-rate enabled, sample rate can go up to 96kHZ
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static constexpr u16 pcm_sample_rate_minimum = 8000;
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static constexpr u16 pcm_sample_rate_maximum = 48000;
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UNMAP_AFTER_INIT ErrorOr<NonnullRefPtr<AudioController>> AC97::create(PCI::DeviceIdentifier const& pci_device_identifier)
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{
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auto mixer_io_window = TRY(IOWindow::create_for_pci_device_bar(pci_device_identifier, PCI::HeaderType0BaseRegister::BAR0));
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auto bus_io_window = TRY(IOWindow::create_for_pci_device_bar(pci_device_identifier, PCI::HeaderType0BaseRegister::BAR1));
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auto pcm_out_channel_io_window = TRY(bus_io_window->create_from_io_window_with_offset(NativeAudioBusChannel::PCMOutChannel));
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auto pcm_out_channel = TRY(AC97Channel::create_with_parent_pci_device(pci_device_identifier.address(), "PCMOut"sv, move(pcm_out_channel_io_window)));
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return TRY(adopt_nonnull_ref_or_enomem(new (nothrow) AC97(pci_device_identifier, move(pcm_out_channel), move(mixer_io_window), move(bus_io_window))));
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}
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UNMAP_AFTER_INIT ErrorOr<bool> AC97::probe(PCI::DeviceIdentifier const& device_identifier)
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{
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VERIFY(device_identifier.class_code().value() == to_underlying(PCI::ClassID::Multimedia));
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return device_identifier.subclass_code().value() == to_underlying(PCI::Multimedia::SubclassID::AudioController);
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}
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UNMAP_AFTER_INIT AC97::AC97(PCI::DeviceIdentifier const& pci_device_identifier, NonnullOwnPtr<AC97Channel> pcm_out_channel, NonnullOwnPtr<IOWindow> mixer_io_window, NonnullOwnPtr<IOWindow> bus_io_window)
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: PCI::Device(const_cast<PCI::DeviceIdentifier&>(pci_device_identifier))
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, IRQHandler(pci_device_identifier.interrupt_line().value())
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, m_mixer_io_window(move(mixer_io_window))
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, m_bus_io_window(move(bus_io_window))
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, m_pcm_out_channel(move(pcm_out_channel))
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{
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}
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UNMAP_AFTER_INIT AC97::~AC97() = default;
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bool AC97::handle_irq(RegisterState const&)
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{
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auto pcm_out_status = m_pcm_out_channel->io_window().read16(AC97Channel::Register::Status);
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dbgln_if(AC97_DEBUG, "AC97 @ {}: interrupt received - status: {:#05b}", device_identifier().address(), pcm_out_status);
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bool is_dma_halted = (pcm_out_status & AudioStatusRegisterFlag::DMAControllerHalted) > 0;
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bool current_equals_last_valid = (pcm_out_status & AudioStatusRegisterFlag::CurrentEqualsLastValid) > 0;
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bool is_completion_interrupt = (pcm_out_status & AudioStatusRegisterFlag::BufferCompletionInterruptStatus) > 0;
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bool is_fifo_error = (pcm_out_status & AudioStatusRegisterFlag::FIFOError) > 0;
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VERIFY(!is_fifo_error);
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// If there is no buffer completion, we're not going to do anything
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if (!is_completion_interrupt)
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return false;
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// On interrupt, we need to reset PCM interrupt flags by setting their bits
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pcm_out_status = AudioStatusRegisterFlag::LastValidBufferCompletionInterrupt
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| AudioStatusRegisterFlag::BufferCompletionInterruptStatus
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| AudioStatusRegisterFlag::FIFOError;
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m_pcm_out_channel->io_window().write16(AC97Channel::Register::Status, pcm_out_status);
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if (is_dma_halted) {
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VERIFY(current_equals_last_valid);
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m_pcm_out_channel->handle_dma_stopped();
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}
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if (!m_irq_queue.is_empty())
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m_irq_queue.wake_all();
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return true;
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}
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UNMAP_AFTER_INIT ErrorOr<void> AC97::initialize(Badge<AudioManagement>)
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{
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dbgln_if(AC97_DEBUG, "AC97 @ {}: mixer base: {:#04x}", device_identifier().address(), m_mixer_io_window);
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dbgln_if(AC97_DEBUG, "AC97 @ {}: bus base: {:#04x}", device_identifier().address(), m_bus_io_window);
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m_audio_channel = TRY(AudioChannel::create(*this, 0));
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// Read out AC'97 codec revision and vendor
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auto extended_audio_id = m_mixer_io_window->read16(NativeAudioMixerRegister::ExtendedAudioID);
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m_codec_revision = static_cast<AC97Revision>(((extended_audio_id & ExtendedAudioMask::Revision) >> 10) & 0b11);
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dbgln_if(AC97_DEBUG, "AC97 @ {}: codec revision {:#02b}", device_identifier().address(), to_underlying(m_codec_revision));
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if (m_codec_revision == AC97Revision::Reserved)
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return ENOTSUP;
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// Report vendor / device ID
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u32 vendor_id = m_mixer_io_window->read16(NativeAudioMixerRegister::VendorID1) << 16 | m_mixer_io_window->read16(NativeAudioMixerRegister::VendorID2);
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dmesgln_pci(*this, "Vendor ID: {:#8x}", vendor_id);
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// Bus cold reset, enable interrupts
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enable_pin_based_interrupts();
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PCI::enable_bus_mastering(device_identifier());
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auto control = m_bus_io_window->read32(NativeAudioBusRegister::GlobalControl);
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control |= GlobalControlFlag::GPIInterruptEnable;
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control |= GlobalControlFlag::AC97ColdReset;
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m_bus_io_window->write32(NativeAudioBusRegister::GlobalControl, control);
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// Reset mixer
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m_mixer_io_window->write16(NativeAudioMixerRegister::Reset, 1);
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// Enable variable and double rate PCM audio if supported
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auto extended_audio_status = m_mixer_io_window->read16(NativeAudioMixerRegister::ExtendedAudioStatusControl);
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if ((extended_audio_id & ExtendedAudioMask::VariableRatePCMAudio) > 0) {
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extended_audio_status |= ExtendedAudioStatusControlFlag::VariableRateAudio;
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m_variable_rate_pcm_supported = true;
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}
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if (!m_variable_rate_pcm_supported) {
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extended_audio_status &= ~ExtendedAudioStatusControlFlag::DoubleRateAudio;
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} else if ((extended_audio_id & ExtendedAudioMask::DoubleRatePCMAudio) > 0) {
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extended_audio_status |= ExtendedAudioStatusControlFlag::DoubleRateAudio;
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m_double_rate_pcm_enabled = true;
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}
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m_mixer_io_window->write16(NativeAudioMixerRegister::ExtendedAudioStatusControl, extended_audio_status);
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TRY(set_pcm_output_sample_rate(m_variable_rate_pcm_supported ? pcm_default_sample_rate : pcm_fixed_sample_rate));
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// Left and right volume of 0 means attenuation of 0 dB
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set_master_output_volume(0, 0, Muted::No);
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set_pcm_output_volume(0, 0, Muted::No);
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m_pcm_out_channel->reset();
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enable_irq();
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return {};
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}
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void AC97::set_master_output_volume(u8 left_channel, u8 right_channel, Muted mute)
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{
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u16 volume_value = ((right_channel & 63) << 0)
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| ((left_channel & 63) << 8)
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| ((mute == Muted::Yes ? 1 : 0) << 15);
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m_mixer_io_window->write16(NativeAudioMixerRegister::SetMasterOutputVolume, volume_value);
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}
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ErrorOr<void> AC97::set_pcm_output_sample_rate(u32 sample_rate)
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{
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if (m_sample_rate == sample_rate)
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return {};
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auto const double_rate_shift = m_double_rate_pcm_enabled ? 1 : 0;
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auto shifted_sample_rate = sample_rate >> double_rate_shift;
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if (!m_variable_rate_pcm_supported && shifted_sample_rate != pcm_fixed_sample_rate)
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return ENOTSUP;
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if (shifted_sample_rate < pcm_sample_rate_minimum || shifted_sample_rate > pcm_sample_rate_maximum)
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return ENOTSUP;
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m_mixer_io_window->write16(NativeAudioMixerRegister::PCMFrontDACRate, shifted_sample_rate);
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m_sample_rate = static_cast<u32>(m_mixer_io_window->read16(NativeAudioMixerRegister::PCMFrontDACRate)) << double_rate_shift;
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dmesgln_pci(*this, "PCM front DAC rate set to {} Hz", m_sample_rate);
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// Setting the sample rate stops a running DMA engine, so restart it
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if (m_pcm_out_channel->dma_running())
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m_pcm_out_channel->start_dma();
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return {};
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}
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void AC97::set_pcm_output_volume(u8 left_channel, u8 right_channel, Muted mute)
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{
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u16 volume_value = ((right_channel & 31) << 0)
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| ((left_channel & 31) << 8)
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| ((mute == Muted::Yes ? 1 : 0) << 15);
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m_mixer_io_window->write16(NativeAudioMixerRegister::SetPCMOutputVolume, volume_value);
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}
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RefPtr<AudioChannel> AC97::audio_channel(u32 index) const
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{
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if (index == 0)
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return m_audio_channel;
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return {};
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}
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ErrorOr<void> AC97::set_pcm_output_sample_rate(size_t channel_index, u32 samples_per_second_rate)
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{
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if (channel_index != 0)
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return ENODEV;
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TRY(set_pcm_output_sample_rate(samples_per_second_rate));
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return {};
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}
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ErrorOr<u32> AC97::get_pcm_output_sample_rate(size_t channel_index)
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{
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if (channel_index != 0)
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return Error::from_errno(ENODEV);
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return m_sample_rate;
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}
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ErrorOr<size_t> AC97::write(size_t channel_index, UserOrKernelBuffer const& data, size_t length)
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{
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if (channel_index != 0)
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return Error::from_errno(ENODEV);
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if (!m_output_buffer)
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m_output_buffer = TRY(MM.allocate_dma_buffer_pages(m_output_buffer_page_count * PAGE_SIZE, "AC97 Output buffer"sv, Memory::Region::Access::Write));
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if (!m_buffer_descriptor_list) {
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size_t buffer_descriptor_list_size = buffer_descriptor_list_max_entries * sizeof(BufferDescriptorListEntry);
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buffer_descriptor_list_size = TRY(Memory::page_round_up(buffer_descriptor_list_size));
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m_buffer_descriptor_list = TRY(MM.allocate_dma_buffer_pages(buffer_descriptor_list_size, "AC97 Buffer Descriptor List"sv, Memory::Region::Access::Write));
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}
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Checked<size_t> remaining = length;
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size_t offset = 0;
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while (remaining > static_cast<size_t>(0)) {
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TRY(write_single_buffer(data, offset, min(remaining.value(), PAGE_SIZE)));
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offset += PAGE_SIZE;
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remaining.saturating_sub(PAGE_SIZE);
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}
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return length;
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}
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ErrorOr<void> AC97::write_single_buffer(UserOrKernelBuffer const& data, size_t offset, size_t length)
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{
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VERIFY(length <= PAGE_SIZE);
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{
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// Block until we can write into an unused buffer
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InterruptDisabler disabler;
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do {
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auto pcm_out_status = m_pcm_out_channel->io_window().read16(AC97Channel::Register::Status);
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auto current_index = m_pcm_out_channel->io_window().read8(AC97Channel::Register::CurrentIndexValue);
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int last_valid_index = m_pcm_out_channel->io_window().read8(AC97Channel::Register::LastValidIndex);
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auto head_distance = last_valid_index - current_index;
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if (head_distance < 0)
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head_distance += buffer_descriptor_list_max_entries;
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if (m_pcm_out_channel->dma_running())
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++head_distance;
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// Current index has _passed_ last valid index - move our list index up
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if (head_distance > m_output_buffer_page_count) {
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m_buffer_descriptor_list_index = current_index + 1;
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break;
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}
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// There is room for our data
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if (head_distance < m_output_buffer_page_count)
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break;
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dbgln_if(AC97_DEBUG, "AC97 @ {}: waiting on interrupt - status: {:#05b} CI: {} LVI: {}", device_identifier().address(), pcm_out_status, current_index, last_valid_index);
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m_irq_queue.wait_forever("AC97"sv);
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} while (m_pcm_out_channel->dma_running());
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}
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// Copy data from userspace into one of our buffers
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TRY(data.read(m_output_buffer->vaddr_from_page_index(m_output_buffer_page_index).as_ptr(), offset, length));
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// Write the next entry to the buffer descriptor list
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u16 number_of_samples = length / sizeof(u16);
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auto list_entries = reinterpret_cast<BufferDescriptorListEntry*>(m_buffer_descriptor_list->vaddr().get());
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auto list_entry = &list_entries[m_buffer_descriptor_list_index];
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list_entry->buffer_pointer = static_cast<u32>(m_output_buffer->physical_page(m_output_buffer_page_index)->paddr().get());
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list_entry->control_and_length = number_of_samples | BufferDescriptorListEntryFlags::InterruptOnCompletion;
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auto buffer_address = static_cast<u32>(m_buffer_descriptor_list->physical_page(0)->paddr().get());
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m_pcm_out_channel->set_last_valid_index(buffer_address, m_buffer_descriptor_list_index);
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if (!m_pcm_out_channel->dma_running())
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m_pcm_out_channel->start_dma();
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m_output_buffer_page_index = (m_output_buffer_page_index + 1) % m_output_buffer_page_count;
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m_buffer_descriptor_list_index = (m_buffer_descriptor_list_index + 1) % buffer_descriptor_list_max_entries;
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return {};
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}
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ErrorOr<NonnullOwnPtr<AC97::AC97Channel>> AC97::AC97Channel::create_with_parent_pci_device(PCI::Address pci_device_address, StringView name, NonnullOwnPtr<IOWindow> channel_io_base)
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{
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return adopt_nonnull_own_or_enomem(new (nothrow) AC97::AC97Channel(pci_device_address, name, move(channel_io_base)));
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}
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void AC97::AC97Channel::handle_dma_stopped()
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{
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dbgln_if(AC97_DEBUG, "AC97 @ {}: channel {}: DMA engine has stopped", m_device_pci_address, name());
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m_dma_running.with([this](auto& dma_running) {
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// NOTE: QEMU might send spurious interrupts while we're not running, so we don't want to panic here.
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if (!dma_running)
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dbgln("AC97 @ {}: received DMA interrupt while it wasn't running", m_device_pci_address);
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dma_running = false;
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});
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}
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void AC97::AC97Channel::reset()
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{
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dbgln_if(AC97_DEBUG, "AC97 @ {}: channel {}: resetting", m_device_pci_address, name());
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m_channel_io_window->write8(Register::Control, AudioControlRegisterFlag::ResetRegisters);
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while ((m_channel_io_window->read8(Register::Control) & AudioControlRegisterFlag::ResetRegisters) > 0)
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microseconds_delay(50);
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m_dma_running.with([](auto& dma_running) {
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dma_running = false;
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});
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}
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void AC97::AC97Channel::set_last_valid_index(u32 buffer_address, u8 last_valid_index)
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{
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dbgln_if(AC97_DEBUG, "AC97 @ {}: channel {}: setting buffer address: {:#x} LVI: {}", m_device_pci_address, name(), buffer_address, last_valid_index);
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m_channel_io_window->write32(Register::BufferDescriptorListBaseAddress, buffer_address);
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m_channel_io_window->write8(Register::LastValidIndex, last_valid_index);
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}
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void AC97::AC97Channel::start_dma()
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{
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dbgln_if(AC97_DEBUG, "AC97 @ {}: channel {}: starting DMA engine", m_device_pci_address, name());
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auto control = m_channel_io_window->read8(Register::Control);
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control |= AudioControlRegisterFlag::RunPauseBusMaster;
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control |= AudioControlRegisterFlag::FIFOErrorInterruptEnable;
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control |= AudioControlRegisterFlag::InterruptOnCompletionEnable;
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m_channel_io_window->write8(Register::Control, control);
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m_dma_running.with([](auto& dma_running) {
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dma_running = true;
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});
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}
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}
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