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Kernel: Add generic channel support to AC97

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This factors out some hardcoded PCMOut registers into a new private
class called AC97Channel, which wraps around a channel's registers and
provides some shared functionality.

No functional changes.
This commit is contained in:
Jelle Raaijmakers 2021-11-23 12:36:32 +01:00 • committed by Andreas Kling
parent d117c4cccc
commit 70ca8b24dc
2 changed files with 90 additions and 48 deletions
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53
Kernel/Devices/Audio/AC97.h
View file

@ -57,13 +57,16 @@ private:
Revision23 = 0b10,
};
enum NativeAudioBusChannel : u8 {
PCMInChannel = 0x00,
PCMOutChannel = 0x10,
MicrophoneInChannel = 0x20,
Microphone2Channel = 0x40,
PCMIn2Channel = 0x50,
SPDIFChannel = 0x60,
};
enum NativeAudioBusRegister : u8 {
PCMOutBufferDescriptorListBaseAddress = 0x10,
PCMOutCurrentIndex = 0x14,
PCMOutLastValidIndex = 0x15,
PCMOutStatus = 0x16,
PCMOutPrefetchedIndex = 0x1a,
PCMOutControl = 0x1b,
GlobalControl = 0x2c,
};
@ -102,6 +105,39 @@ private:
InterruptOnCompletion = 1u << 31,
};
class AC97Channel {
public:
enum Register : u8 {
BufferDescriptorListBaseAddress = 0x00,
CurrentIndexValue = 0x04,
LastValidIndex = 0x05,
Status = 0x06,
PositionInCurrentBuffer = 0x08,
PrefetchedIndexValue = 0x0a,
Control = 0x0b,
};
AC97Channel(AC97& device, StringView name, IOAddress channel_base)
: m_channel_base(channel_base)
, m_device(device)
, m_name(name)
{
}
bool dma_running() const { return m_dma_running; }
StringView name() const { return m_name; }
IOAddress reg(Register reg) const { return m_channel_base.offset(reg); }
void reset();
void set_last_valid_index(u32 buffer_address, u8 last_valid_index);
void start_dma();
private:
IOAddress m_channel_base;
AC97& m_device;
bool m_dma_running = false;
StringView m_name;
};
AC97(PCI::DeviceIdentifier);
// ^IRQHandler
@ -110,13 +146,12 @@ private:
// ^CharacterDevice
virtual StringView class_name() const override { return "AC97"sv; }
AC97Channel channel(StringView name, NativeAudioBusChannel channel) { return AC97Channel(*this, name, m_io_bus_base.offset(channel)); }
void initialize();
void reset_pcm_out();
void set_master_output_volume(u8, u8, Muted);
void set_pcm_output_sample_rate(u16);
void set_pcm_output_volume(u8, u8, Muted);
void set_output_buffer_dma_lvi(u8);
void start_output_buffer_dma();
OwnPtr<Memory::Region> m_buffer_descriptor_list;
u8 m_buffer_descriptor_list_index = 0;
@ -124,9 +159,9 @@ private:
IOAddress m_io_bus_base;
WaitQueue m_irq_queue;
OwnPtr<Memory::Region> m_output_buffer;
bool m_output_buffer_dma_running = false;
u8 m_output_buffer_page_count = 4;
u8 m_output_buffer_page_index = 0;
AC97Channel m_pcm_out_channel;
u16 m_sample_rate = 44100;
};