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https://github.com/RGBCube/serenity
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Kernel: Move SB16 to Audio subdirectory
This commit is contained in:
Jelle Raaijmakers
Andreas Kling
parent
4d302e0e88
commit
61d77274db
5 changed files with 4 additions and 4 deletions
295
Kernel/Devices/Audio/SB16.cpp
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295
Kernel/Devices/Audio/SB16.cpp
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Memory.h>
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#include <AK/StringView.h>
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#include <Kernel/Arch/x86/IO.h>
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#include <Kernel/Arch/x86/InterruptDisabler.h>
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#include <Kernel/Debug.h>
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#include <Kernel/Devices/Audio/SB16.h>
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#include <Kernel/Devices/DeviceManagement.h>
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#include <Kernel/Memory/AnonymousVMObject.h>
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#include <Kernel/Memory/MemoryManager.h>
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#include <Kernel/Sections.h>
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#include <Kernel/Thread.h>
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#include <LibC/sys/ioctl_numbers.h>
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namespace Kernel {
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enum class SampleFormat : u8 {
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Signed = 0x10,
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Stereo = 0x20,
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};
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constexpr int SB16_DEFAULT_IRQ = 5;
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constexpr u16 DSP_READ = 0x22A;
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constexpr u16 DSP_WRITE = 0x22C;
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constexpr u16 DSP_STATUS = 0x22E;
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constexpr u16 DSP_R_ACK = 0x22F;
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/* Write a value to the DSP write register */
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void SB16::dsp_write(u8 value)
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{
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while (IO::in8(DSP_WRITE) & 0x80)
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;
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IO::out8(DSP_WRITE, value);
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}
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/* Reads the value of the DSP read register */
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u8 SB16::dsp_read()
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{
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while (!(IO::in8(DSP_STATUS) & 0x80))
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;
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return IO::in8(DSP_READ);
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}
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/* Changes the sample rate of sound output */
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void SB16::set_sample_rate(uint16_t hz)
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{
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dbgln("SB16: Changing sample rate to {} Hz", hz);
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m_sample_rate = hz;
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dsp_write(0x41); // output
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dsp_write((u8)(hz >> 8));
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dsp_write((u8)hz);
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dsp_write(0x42); // input
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dsp_write((u8)(hz >> 8));
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dsp_write((u8)hz);
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}
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UNMAP_AFTER_INIT SB16::SB16()
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: IRQHandler(SB16_DEFAULT_IRQ)
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// FIXME: We can't change version numbers later, i.e. after the sound card is initialized.
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, CharacterDevice(42, 42)
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{
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initialize();
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}
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UNMAP_AFTER_INIT SB16::~SB16()
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{
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}
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UNMAP_AFTER_INIT RefPtr<SB16> SB16::try_detect_and_create()
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{
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IO::out8(0x226, 1);
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IO::delay(32);
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IO::out8(0x226, 0);
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auto data = dsp_read();
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if (data != 0xaa)
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return {};
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auto device_or_error = DeviceManagement::try_create_device<SB16>();
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if (device_or_error.is_error())
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return {};
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return device_or_error.release_value();
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}
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UNMAP_AFTER_INIT void SB16::initialize()
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{
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disable_irq();
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IO::out8(0x226, 1);
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IO::delay(32);
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IO::out8(0x226, 0);
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auto data = dsp_read();
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if (data != 0xaa) {
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dbgln("SB16: SoundBlaster not ready");
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return;
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}
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// Get the version info
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dsp_write(0xe1);
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m_major_version = dsp_read();
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auto vmin = dsp_read();
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dmesgln("SB16: Found version {}.{}", m_major_version, vmin);
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set_irq_register(SB16_DEFAULT_IRQ);
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dmesgln("SB16: IRQ {}", get_irq_line());
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set_sample_rate(m_sample_rate);
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}
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ErrorOr<void> SB16::ioctl(OpenFileDescription&, unsigned request, Userspace<void*> arg)
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{
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switch (request) {
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case SOUNDCARD_IOCTL_GET_SAMPLE_RATE: {
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auto output = static_ptr_cast<u16*>(arg);
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return copy_to_user(output, &m_sample_rate);
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}
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case SOUNDCARD_IOCTL_SET_SAMPLE_RATE: {
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auto sample_rate_value = static_cast<u16>(arg.ptr());
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if (sample_rate_value == 0)
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return EINVAL;
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if (m_sample_rate != sample_rate_value)
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set_sample_rate(sample_rate_value);
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return {};
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}
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default:
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return EINVAL;
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}
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}
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void SB16::set_irq_register(u8 irq_number)
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{
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u8 bitmask;
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switch (irq_number) {
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case 2:
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bitmask = 0;
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break;
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case 5:
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bitmask = 0b10;
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break;
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case 7:
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bitmask = 0b100;
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break;
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case 10:
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bitmask = 0b1000;
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break;
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default:
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VERIFY_NOT_REACHED();
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}
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IO::out8(0x224, 0x80);
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IO::out8(0x225, bitmask);
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}
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u8 SB16::get_irq_line()
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{
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IO::out8(0x224, 0x80);
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u8 bitmask = IO::in8(0x225);
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switch (bitmask) {
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case 0:
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return 2;
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case 0b10:
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return 5;
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case 0b100:
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return 7;
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case 0b1000:
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return 10;
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}
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return bitmask;
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}
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void SB16::set_irq_line(u8 irq_number)
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{
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InterruptDisabler disabler;
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if (irq_number == get_irq_line())
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return;
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set_irq_register(irq_number);
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change_irq_number(irq_number);
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}
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bool SB16::can_read(OpenFileDescription const&, size_t) const
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{
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return false;
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}
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ErrorOr<size_t> SB16::read(OpenFileDescription&, u64, UserOrKernelBuffer&, size_t)
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{
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return 0;
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}
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void SB16::dma_start(uint32_t length)
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{
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auto const addr = m_dma_region->physical_page(0)->paddr().get();
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u8 const channel = 5; // 16-bit samples use DMA channel 5 (on the master DMA controller)
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u8 const mode = 0x48;
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// Disable the DMA channel
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IO::out8(0xd4, 4 + (channel % 4));
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// Clear the byte pointer flip-flop
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IO::out8(0xd8, 0);
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// Write the DMA mode for the transfer
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IO::out8(0xd6, (channel % 4) | mode);
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// Write the offset of the buffer
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u16 offset = (addr / 2) % 65536;
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IO::out8(0xc4, (u8)offset);
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IO::out8(0xc4, (u8)(offset >> 8));
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// Write the transfer length
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IO::out8(0xc6, (u8)(length - 1));
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IO::out8(0xc6, (u8)((length - 1) >> 8));
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// Write the buffer
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IO::out8(0x8b, addr >> 16);
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auto page_number = addr >> 16;
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VERIFY(page_number <= NumericLimits<u8>::max());
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IO::out8(0x8b, page_number);
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// Enable the DMA channel
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IO::out8(0xd4, (channel % 4));
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}
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bool SB16::handle_irq(RegisterState const&)
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{
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// FIXME: Check if the interrupt was actually for us or not... (shared IRQs)
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// Stop sound output ready for the next block.
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dsp_write(0xd5);
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IO::in8(DSP_STATUS); // 8 bit interrupt
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if (m_major_version >= 4)
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IO::in8(DSP_R_ACK); // 16 bit interrupt
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m_irq_queue.wake_all();
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return true;
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}
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void SB16::wait_for_irq()
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{
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m_irq_queue.wait_forever("SB16");
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disable_irq();
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}
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ErrorOr<size_t> SB16::write(OpenFileDescription&, u64, UserOrKernelBuffer const& data, size_t length)
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{
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if (!m_dma_region) {
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auto page = MM.allocate_supervisor_physical_page();
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if (!page)
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return ENOMEM;
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auto nonnull_page = page.release_nonnull();
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auto vmobject = TRY(Memory::AnonymousVMObject::try_create_with_physical_pages({ &nonnull_page, 1 }));
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m_dma_region = TRY(MM.allocate_kernel_region_with_vmobject(move(vmobject), PAGE_SIZE, "SB16 DMA buffer", Memory::Region::Access::Write));
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}
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dbgln_if(SB16_DEBUG, "SB16: Writing buffer of {} bytes", length);
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VERIFY(length <= PAGE_SIZE);
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int const BLOCK_SIZE = 32 * 1024;
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if (length > BLOCK_SIZE) {
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return ENOSPC;
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}
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u8 mode = (u8)SampleFormat::Signed | (u8)SampleFormat::Stereo;
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TRY(data.read(m_dma_region->vaddr().as_ptr(), length));
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dma_start(length);
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// 16-bit single-cycle output.
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// FIXME: Implement auto-initialized output.
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u8 command = 0xb0;
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u16 sample_count = length / sizeof(i16);
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if (mode & (u8)SampleFormat::Stereo)
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sample_count /= 2;
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sample_count -= 1;
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cli();
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enable_irq();
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dsp_write(command);
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dsp_write(mode);
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dsp_write((u8)sample_count);
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dsp_write((u8)(sample_count >> 8));
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wait_for_irq();
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return length;
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}
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}
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