RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 05:07:35 +00:00
Code Issues Activity Actions

Kernel: Move AC'97 to its own subdirectory

Browse source
This commit is contained in:
Jelle Raaijmakers 2023-06-19 21:12:45 +02:00 • committed by Andreas Kling
parent 5080419b61
commit 2133bae1a4
4 changed files with 3 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

339
Kernel/Devices/Audio/AC97/AC97.cpp Normal file
View file

@ -0,0 +1,339 @@
/*
* Copyright (c) 2021-2022, Jelle Raaijmakers <jelle@gmta.nl>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Format.h>
#include <Kernel/Arch/Delay.h>
#include <Kernel/Devices/Audio/AC97/AC97.h>
#include <Kernel/Devices/DeviceManagement.h>
#include <Kernel/Interrupts/InterruptDisabler.h>
#include <Kernel/Memory/AnonymousVMObject.h>
namespace Kernel {
static constexpr int buffer_descriptor_list_max_entries = 32;
static constexpr u16 pcm_fixed_sample_rate = 48000;
// Valid output range - with double-rate enabled, sample rate can go up to 96kHZ
static constexpr u16 pcm_sample_rate_minimum = 8000;
static constexpr u16 pcm_sample_rate_maximum = 48000;
UNMAP_AFTER_INIT ErrorOr<NonnullRefPtr<AudioController>> AC97::create(PCI::DeviceIdentifier const& pci_device_identifier)
{
auto mixer_io_window = TRY(IOWindow::create_for_pci_device_bar(pci_device_identifier, PCI::HeaderType0BaseRegister::BAR0));
auto bus_io_window = TRY(IOWindow::create_for_pci_device_bar(pci_device_identifier, PCI::HeaderType0BaseRegister::BAR1));
auto pcm_out_channel_io_window = TRY(bus_io_window->create_from_io_window_with_offset(NativeAudioBusChannel::PCMOutChannel));
auto pcm_out_channel = TRY(AC97Channel::create_with_parent_pci_device(pci_device_identifier.address(), "PCMOut"sv, move(pcm_out_channel_io_window)));
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))));
}
UNMAP_AFTER_INIT ErrorOr<bool> AC97::probe(PCI::DeviceIdentifier const& device_identifier)
{
VERIFY(device_identifier.class_code().value() == to_underlying(PCI::ClassID::Multimedia));
return device_identifier.subclass_code().value() == to_underlying(PCI::Multimedia::SubclassID::AudioController);
}
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)
: PCI::Device(const_cast<PCI::DeviceIdentifier&>(pci_device_identifier))
, IRQHandler(pci_device_identifier.interrupt_line().value())
, m_mixer_io_window(move(mixer_io_window))
, m_bus_io_window(move(bus_io_window))
, m_pcm_out_channel(move(pcm_out_channel))
{
}
UNMAP_AFTER_INIT AC97::~AC97() = default;
bool AC97::handle_irq(RegisterState const&)
{
auto pcm_out_status = m_pcm_out_channel->io_window().read16(AC97Channel::Register::Status);
dbgln_if(AC97_DEBUG, "AC97 @ {}: interrupt received - status: {:#05b}", device_identifier().address(), pcm_out_status);
bool is_dma_halted = (pcm_out_status & AudioStatusRegisterFlag::DMAControllerHalted) > 0;
bool current_equals_last_valid = (pcm_out_status & AudioStatusRegisterFlag::CurrentEqualsLastValid) > 0;
bool is_completion_interrupt = (pcm_out_status & AudioStatusRegisterFlag::BufferCompletionInterruptStatus) > 0;
bool is_fifo_error = (pcm_out_status & AudioStatusRegisterFlag::FIFOError) > 0;
VERIFY(!is_fifo_error);
// If there is no buffer completion, we're not going to do anything
if (!is_completion_interrupt)
return false;
// On interrupt, we need to reset PCM interrupt flags by setting their bits
pcm_out_status = AudioStatusRegisterFlag::LastValidBufferCompletionInterrupt
| AudioStatusRegisterFlag::BufferCompletionInterruptStatus
| AudioStatusRegisterFlag::FIFOError;
m_pcm_out_channel->io_window().write16(AC97Channel::Register::Status, pcm_out_status);
if (is_dma_halted) {
VERIFY(current_equals_last_valid);
m_pcm_out_channel->handle_dma_stopped();
}
if (!m_irq_queue.is_empty())
m_irq_queue.wake_all();
return true;
}
UNMAP_AFTER_INIT ErrorOr<void> AC97::initialize(Badge<AudioManagement>)
{
dbgln_if(AC97_DEBUG, "AC97 @ {}: mixer base: {:#04x}", device_identifier().address(), m_mixer_io_window);
dbgln_if(AC97_DEBUG, "AC97 @ {}: bus base: {:#04x}", device_identifier().address(), m_bus_io_window);
m_audio_channel = TRY(AudioChannel::create(*this, 0));
// Read out AC'97 codec revision and vendor
auto extended_audio_id = m_mixer_io_window->read16(NativeAudioMixerRegister::ExtendedAudioID);
m_codec_revision = static_cast<AC97Revision>(((extended_audio_id & ExtendedAudioMask::Revision) >> 10) & 0b11);
dbgln_if(AC97_DEBUG, "AC97 @ {}: codec revision {:#02b}", device_identifier().address(), to_underlying(m_codec_revision));
if (m_codec_revision == AC97Revision::Reserved)
return ENOTSUP;
// Report vendor / device ID
u32 vendor_id = m_mixer_io_window->read16(NativeAudioMixerRegister::VendorID1) << 16 | m_mixer_io_window->read16(NativeAudioMixerRegister::VendorID2);
dmesgln_pci(*this, "Vendor ID: {:#8x}", vendor_id);
// Bus cold reset, enable interrupts
enable_pin_based_interrupts();
PCI::enable_bus_mastering(device_identifier());
auto control = m_bus_io_window->read32(NativeAudioBusRegister::GlobalControl);
control |= GlobalControlFlag::GPIInterruptEnable;
control |= GlobalControlFlag::AC97ColdReset;
m_bus_io_window->write32(NativeAudioBusRegister::GlobalControl, control);
// Reset mixer
m_mixer_io_window->write16(NativeAudioMixerRegister::Reset, 1);
// Enable variable and double rate PCM audio if supported
auto extended_audio_status = m_mixer_io_window->read16(NativeAudioMixerRegister::ExtendedAudioStatusControl);
if ((extended_audio_id & ExtendedAudioMask::VariableRatePCMAudio) > 0) {
extended_audio_status |= ExtendedAudioStatusControlFlag::VariableRateAudio;
m_variable_rate_pcm_supported = true;
}
if (!m_variable_rate_pcm_supported) {
extended_audio_status &= ~ExtendedAudioStatusControlFlag::DoubleRateAudio;
} else if ((extended_audio_id & ExtendedAudioMask::DoubleRatePCMAudio) > 0) {
extended_audio_status |= ExtendedAudioStatusControlFlag::DoubleRateAudio;
m_double_rate_pcm_enabled = true;
}
m_mixer_io_window->write16(NativeAudioMixerRegister::ExtendedAudioStatusControl, extended_audio_status);
// Get the device's current sample rate
m_sample_rate = read_pcm_output_sample_rate();
// Left and right volume of 0 means attenuation of 0 dB
set_master_output_volume(0, 0, Muted::No);
set_pcm_output_volume(0, 0, Muted::No);
m_pcm_out_channel->reset();
enable_irq();
return {};
}
void AC97::set_master_output_volume(u8 left_channel, u8 right_channel, Muted mute)
{
u16 volume_value = ((right_channel & 63) << 0)
| ((left_channel & 63) << 8)
| ((mute == Muted::Yes ? 1 : 0) << 15);
m_mixer_io_window->write16(NativeAudioMixerRegister::SetMasterOutputVolume, volume_value);
}
u32 AC97::read_pcm_output_sample_rate()
{
auto const double_rate_shift = m_double_rate_pcm_enabled ? 1 : 0;
return static_cast<u32>(m_mixer_io_window->read16(NativeAudioMixerRegister::PCMFrontDACRate)) << double_rate_shift;
}
ErrorOr<void> AC97::set_pcm_output_sample_rate(u32 sample_rate)
{
if (m_sample_rate == sample_rate)
return {};
auto const double_rate_shift = m_double_rate_pcm_enabled ? 1 : 0;
auto shifted_sample_rate = sample_rate >> double_rate_shift;
if (!m_variable_rate_pcm_supported && shifted_sample_rate != pcm_fixed_sample_rate)
return ENOTSUP;
if (shifted_sample_rate < pcm_sample_rate_minimum || shifted_sample_rate > pcm_sample_rate_maximum)
return ENOTSUP;
m_mixer_io_window->write16(NativeAudioMixerRegister::PCMFrontDACRate, shifted_sample_rate);
m_sample_rate = read_pcm_output_sample_rate();
dmesgln_pci(*this, "PCM front DAC rate set to {} Hz", m_sample_rate);
// Setting the sample rate stops a running DMA engine, so restart it
if (m_pcm_out_channel->dma_running())
m_pcm_out_channel->start_dma();
return {};
}
void AC97::set_pcm_output_volume(u8 left_channel, u8 right_channel, Muted mute)
{
u16 volume_value = ((right_channel & 31) << 0)
| ((left_channel & 31) << 8)
| ((mute == Muted::Yes ? 1 : 0) << 15);
m_mixer_io_window->write16(NativeAudioMixerRegister::SetPCMOutputVolume, volume_value);
}
RefPtr<AudioChannel> AC97::audio_channel(u32 index) const
{
if (index == 0)
return m_audio_channel;
return {};
}
ErrorOr<void> AC97::set_pcm_output_sample_rate(size_t channel_index, u32 samples_per_second_rate)
{
if (channel_index != 0)
return ENODEV;
TRY(set_pcm_output_sample_rate(samples_per_second_rate));
return {};
}
ErrorOr<u32> AC97::get_pcm_output_sample_rate(size_t channel_index)
{
if (channel_index != 0)
return Error::from_errno(ENODEV);
return m_sample_rate;
}
ErrorOr<size_t> AC97::write(size_t channel_index, UserOrKernelBuffer const& data, size_t length)
{
if (channel_index != 0)
return Error::from_errno(ENODEV);
if (!m_output_buffer)
m_output_buffer = TRY(MM.allocate_dma_buffer_pages(m_output_buffer_page_count * PAGE_SIZE, "AC97 Output buffer"sv, Memory::Region::Access::Write));
if (!m_buffer_descriptor_list) {
size_t buffer_descriptor_list_size = buffer_descriptor_list_max_entries * sizeof(BufferDescriptorListEntry);
buffer_descriptor_list_size = TRY(Memory::page_round_up(buffer_descriptor_list_size));
m_buffer_descriptor_list = TRY(MM.allocate_dma_buffer_pages(buffer_descriptor_list_size, "AC97 Buffer Descriptor List"sv, Memory::Region::Access::Write));
}
Checked<size_t> remaining = length;
size_t offset = 0;
while (remaining > static_cast<size_t>(0)) {
TRY(write_single_buffer(data, offset, min(remaining.value(), PAGE_SIZE)));
offset += PAGE_SIZE;
remaining.saturating_sub(PAGE_SIZE);
}
return length;
}
ErrorOr<void> AC97::write_single_buffer(UserOrKernelBuffer const& data, size_t offset, size_t length)
{
VERIFY(length <= PAGE_SIZE);
{
// Block until we can write into an unused buffer
InterruptDisabler disabler;
do {
auto pcm_out_status = m_pcm_out_channel->io_window().read16(AC97Channel::Register::Status);
auto current_index = m_pcm_out_channel->io_window().read8(AC97Channel::Register::CurrentIndexValue);
int last_valid_index = m_pcm_out_channel->io_window().read8(AC97Channel::Register::LastValidIndex);
auto head_distance = last_valid_index - current_index;
if (head_distance < 0)
head_distance += buffer_descriptor_list_max_entries;
if (m_pcm_out_channel->dma_running())
++head_distance;
// Current index has _passed_ last valid index - move our list index up
if (head_distance > m_output_buffer_page_count) {
m_buffer_descriptor_list_index = current_index + 1;
break;
}
// There is room for our data
if (head_distance < m_output_buffer_page_count)
break;
dbgln_if(AC97_DEBUG, "AC97 @ {}: waiting on interrupt - status: {:#05b} CI: {} LVI: {}", device_identifier().address(), pcm_out_status, current_index, last_valid_index);
m_irq_queue.wait_forever("AC97"sv);
} while (m_pcm_out_channel->dma_running());
}
// Copy data from userspace into one of our buffers
TRY(data.read(m_output_buffer->vaddr_from_page_index(m_output_buffer_page_index).as_ptr(), offset, length));
// Write the next entry to the buffer descriptor list
u16 number_of_samples = length / sizeof(u16);
auto list_entries = reinterpret_cast<BufferDescriptorListEntry*>(m_buffer_descriptor_list->vaddr().get());
auto list_entry = &list_entries[m_buffer_descriptor_list_index];
list_entry->buffer_pointer = static_cast<u32>(m_output_buffer->physical_page(m_output_buffer_page_index)->paddr().get());
list_entry->control_and_length = number_of_samples | BufferDescriptorListEntryFlags::InterruptOnCompletion;
auto buffer_address = static_cast<u32>(m_buffer_descriptor_list->physical_page(0)->paddr().get());
m_pcm_out_channel->set_last_valid_index(buffer_address, m_buffer_descriptor_list_index);
if (!m_pcm_out_channel->dma_running())
m_pcm_out_channel->start_dma();
m_output_buffer_page_index = (m_output_buffer_page_index + 1) % m_output_buffer_page_count;
m_buffer_descriptor_list_index = (m_buffer_descriptor_list_index + 1) % buffer_descriptor_list_max_entries;
return {};
}
ErrorOr<NonnullOwnPtr<AC97::AC97Channel>> AC97::AC97Channel::create_with_parent_pci_device(PCI::Address pci_device_address, StringView name, NonnullOwnPtr<IOWindow> channel_io_base)
{
return adopt_nonnull_own_or_enomem(new (nothrow) AC97::AC97Channel(pci_device_address, name, move(channel_io_base)));
}
void AC97::AC97Channel::handle_dma_stopped()
{
dbgln_if(AC97_DEBUG, "AC97 @ {}: channel {}: DMA engine has stopped", m_device_pci_address, name());
m_dma_running.with([this](auto& dma_running) {
// NOTE: QEMU might send spurious interrupts while we're not running, so we don't want to panic here.
if (!dma_running)
dbgln("AC97 @ {}: received DMA interrupt while it wasn't running", m_device_pci_address);
dma_running = false;
});
}
void AC97::AC97Channel::reset()
{
dbgln_if(AC97_DEBUG, "AC97 @ {}: channel {}: resetting", m_device_pci_address, name());
m_channel_io_window->write8(Register::Control, AudioControlRegisterFlag::ResetRegisters);
while ((m_channel_io_window->read8(Register::Control) & AudioControlRegisterFlag::ResetRegisters) > 0)
microseconds_delay(50);
m_dma_running.with([](auto& dma_running) {
dma_running = false;
});
}
void AC97::AC97Channel::set_last_valid_index(u32 buffer_address, u8 last_valid_index)
{
dbgln_if(AC97_DEBUG, "AC97 @ {}: channel {}: setting buffer address: {:#x} LVI: {}", m_device_pci_address, name(), buffer_address, last_valid_index);
m_channel_io_window->write32(Register::BufferDescriptorListBaseAddress, buffer_address);
m_channel_io_window->write8(Register::LastValidIndex, last_valid_index);
}
void AC97::AC97Channel::start_dma()
{
dbgln_if(AC97_DEBUG, "AC97 @ {}: channel {}: starting DMA engine", m_device_pci_address, name());
auto control = m_channel_io_window->read8(Register::Control);
control |= AudioControlRegisterFlag::RunPauseBusMaster;
control |= AudioControlRegisterFlag::FIFOErrorInterruptEnable;
control |= AudioControlRegisterFlag::InterruptOnCompletionEnable;
m_channel_io_window->write8(Register::Control, control);
m_dma_running.with([](auto& dma_running) {
dma_running = true;
});
}
}