Kernel/Audio: Remove the SB16 driver

This driver is not tested and probably not used on any modern hardware
machine, because it is plugged into the ISA bus and not the PCI bus.
Also, the run script doesn't utilize this device anymore, making it more
hard to test this driver and to ensure it doesn't rot.

3 files changed, 0 insertions, 351 deletions

diff --git a/Kernel/Devices/Audio/Management.cpp b/Kernel/Devices/Audio/Management.cpp
index 095b3c796b..5e05588f9c 100644
--- a/Kernel/Devices/Audio/Management.cpp
+++ b/Kernel/Devices/Audio/Management.cpp
@@ -9,7 +9,6 @@
 #include <Kernel/Bus/PCI/IDs.h>
 #include <Kernel/Devices/Audio/AC97.h>
 #include <Kernel/Devices/Audio/Management.h>
-#include <Kernel/Devices/Audio/SB16.h>
 #include <Kernel/Sections.h>
 
 namespace Kernel {
@@ -39,9 +38,6 @@ UNMAP_AFTER_INIT AudioManagement::AudioManagement()
 
 UNMAP_AFTER_INIT void AudioManagement::enumerate_hardware_controllers()
 {
-    if (auto controller = SB16::try_detect_and_create(); !controller.is_error())
-        m_controllers_list.append(controller.release_value());
-
     PCI::enumerate([&](PCI::DeviceIdentifier const& device_identifier) {
         // Note: Only consider PCI audio controllers
         if (device_identifier.class_code().value() != to_underlying(PCI::ClassID::Multimedia)
diff --git a/Kernel/Devices/Audio/SB16.cpp b/Kernel/Devices/Audio/SB16.cpp
deleted file mode 100644
index 65036ccebf..0000000000
--- a/Kernel/Devices/Audio/SB16.cpp
+++ /dev/null
@@ -1,286 +0,0 @@
-/*
- * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-#include <AK/Memory.h>
-#include <AK/StringView.h>
-#include <Kernel/Arch/x86/IO.h>
-#include <Kernel/Arch/x86/InterruptDisabler.h>
-#include <Kernel/Debug.h>
-#include <Kernel/Devices/Audio/SB16.h>
-#include <Kernel/Devices/DeviceManagement.h>
-#include <Kernel/Memory/AnonymousVMObject.h>
-#include <Kernel/Memory/MemoryManager.h>
-#include <Kernel/Sections.h>
-#include <Kernel/Thread.h>
-#include <LibC/sys/ioctl_numbers.h>
-
-namespace Kernel {
-
-enum class SampleFormat : u8 {
-    Signed = 0x10,
-    Stereo = 0x20,
-};
-
-constexpr int SB16_DEFAULT_IRQ = 5;
-
-constexpr u16 DSP_READ = 0x22A;
-constexpr u16 DSP_WRITE = 0x22C;
-constexpr u16 DSP_STATUS = 0x22E;
-constexpr u16 DSP_R_ACK = 0x22F;
-
-/* Write a value to the DSP write register */
-void SB16::dsp_write(u8 value)
-{
-    while (IO::in8(DSP_WRITE) & 0x80)
-        ;
-    IO::out8(DSP_WRITE, value);
-}
-
-/* Reads the value of the DSP read register */
-u8 SB16::dsp_read()
-{
-    while (!(IO::in8(DSP_STATUS) & 0x80))
-        ;
-    return IO::in8(DSP_READ);
-}
-
-/* Changes the sample rate of sound output */
-void SB16::set_sample_rate(uint16_t hz)
-{
-    dbgln("SB16: Changing sample rate to {} Hz", hz);
-    m_sample_rate = hz;
-    dsp_write(0x41); // output
-    dsp_write((u8)(hz >> 8));
-    dsp_write((u8)hz);
-    dsp_write(0x42); // input
-    dsp_write((u8)(hz >> 8));
-    dsp_write((u8)hz);
-}
-
-UNMAP_AFTER_INIT SB16::SB16()
-    : IRQHandler(SB16_DEFAULT_IRQ)
-{
-    initialize();
-}
-
-UNMAP_AFTER_INIT SB16::~SB16()
-{
-}
-
-UNMAP_AFTER_INIT ErrorOr<NonnullRefPtr<SB16>> SB16::try_detect_and_create()
-{
-    IO::out8(0x226, 1);
-    IO::delay(32);
-    IO::out8(0x226, 0);
-
-    auto data = dsp_read();
-    if (data != 0xaa)
-        return Error::from_errno(ENODEV);
-    return adopt_nonnull_ref_or_enomem(new (nothrow) SB16());
-}
-
-UNMAP_AFTER_INIT void SB16::initialize()
-{
-    disable_irq();
-
-    IO::out8(0x226, 1);
-    IO::delay(32);
-    IO::out8(0x226, 0);
-
-    auto data = dsp_read();
-    if (data != 0xaa) {
-        dbgln("SB16: SoundBlaster not ready");
-        return;
-    }
-
-    // Get the version info
-    dsp_write(0xe1);
-    m_major_version = dsp_read();
-    auto vmin = dsp_read();
-
-    dmesgln("SB16: Found version {}.{}", m_major_version, vmin);
-    set_irq_register(SB16_DEFAULT_IRQ);
-    dmesgln("SB16: IRQ {}", get_irq_line());
-
-    set_sample_rate(m_sample_rate);
-}
-
-void SB16::set_irq_register(u8 irq_number)
-{
-    u8 bitmask;
-    switch (irq_number) {
-    case 2:
-        bitmask = 0;
-        break;
-    case 5:
-        bitmask = 0b10;
-        break;
-    case 7:
-        bitmask = 0b100;
-        break;
-    case 10:
-        bitmask = 0b1000;
-        break;
-    default:
-        VERIFY_NOT_REACHED();
-    }
-    IO::out8(0x224, 0x80);
-    IO::out8(0x225, bitmask);
-}
-
-u8 SB16::get_irq_line()
-{
-    IO::out8(0x224, 0x80);
-    u8 bitmask = IO::in8(0x225);
-    switch (bitmask) {
-    case 0:
-        return 2;
-    case 0b10:
-        return 5;
-    case 0b100:
-        return 7;
-    case 0b1000:
-        return 10;
-    }
-    return bitmask;
-}
-void SB16::set_irq_line(u8 irq_number)
-{
-    InterruptDisabler disabler;
-    if (irq_number == get_irq_line())
-        return;
-    set_irq_register(irq_number);
-    change_irq_number(irq_number);
-}
-
-void SB16::dma_start(uint32_t length)
-{
-    auto const addr = m_dma_region->physical_page(0)->paddr().get();
-    u8 const channel = 5; // 16-bit samples use DMA channel 5 (on the master DMA controller)
-    u8 const mode = 0x48;
-
-    // Disable the DMA channel
-    IO::out8(0xd4, 4 + (channel % 4));
-
-    // Clear the byte pointer flip-flop
-    IO::out8(0xd8, 0);
-
-    // Write the DMA mode for the transfer
-    IO::out8(0xd6, (channel % 4) | mode);
-
-    // Write the offset of the buffer
-    u16 offset = (addr / 2) % 65536;
-    IO::out8(0xc4, (u8)offset);
-    IO::out8(0xc4, (u8)(offset >> 8));
-
-    // Write the transfer length
-    IO::out8(0xc6, (u8)(length - 1));
-    IO::out8(0xc6, (u8)((length - 1) >> 8));
-
-    // Write the buffer
-    IO::out8(0x8b, addr >> 16);
-    auto page_number = addr >> 16;
-    VERIFY(page_number <= NumericLimits<u8>::max());
-    IO::out8(0x8b, page_number);
-
-    // Enable the DMA channel
-    IO::out8(0xd4, (channel % 4));
-}
-
-bool SB16::handle_irq(RegisterState const&)
-{
-    // FIXME: Check if the interrupt was actually for us or not... (shared IRQs)
-
-    // Stop sound output ready for the next block.
-    dsp_write(0xd5);
-
-    IO::in8(DSP_STATUS); // 8 bit interrupt
-    if (m_major_version >= 4)
-        IO::in8(DSP_R_ACK); // 16 bit interrupt
-
-    m_irq_queue.wake_all();
-    return true;
-}
-
-void SB16::wait_for_irq()
-{
-    m_irq_queue.wait_forever("SB16");
-    disable_irq();
-}
-
-RefPtr<AudioChannel> SB16::audio_channel(u32 index) const
-{
-    if (index == 0)
-        return m_audio_channel;
-    return {};
-}
-void SB16::detect_hardware_audio_channels(Badge<AudioManagement>)
-{
-    m_audio_channel = AudioChannel::must_create(*this, 0);
-}
-
-ErrorOr<void> SB16::set_pcm_output_sample_rate(size_t channel_index, u32 samples_per_second_rate)
-{
-    if (channel_index != 0)
-        return Error::from_errno(ENODEV);
-    if (samples_per_second_rate == 0 || samples_per_second_rate > 44100)
-        return Error::from_errno(ENOTSUP);
-    auto sample_rate_value = static_cast<u16>(samples_per_second_rate);
-    if (m_sample_rate != sample_rate_value)
-        set_sample_rate(sample_rate_value);
-    return {};
-}
-
-ErrorOr<u32> SB16::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> SB16::write(size_t channel_index, UserOrKernelBuffer const& data, size_t length)
-{
-    if (channel_index != 0)
-        return Error::from_errno(ENODEV);
-
-    if (!m_dma_region) {
-        m_dma_region = TRY(MM.allocate_dma_buffer_page("SB16 DMA buffer", Memory::Region::Access::Write));
-    }
-
-    dbgln_if(SB16_DEBUG, "SB16: Writing buffer of {} bytes", length);
-
-    if (length > PAGE_SIZE) {
-        return ENOSPC;
-    }
-
-    u8 mode = (u8)SampleFormat::Signed | (u8)SampleFormat::Stereo;
-
-    TRY(data.read(m_dma_region->vaddr().as_ptr(), length));
-    dma_start(length);
-
-    // 16-bit single-cycle output.
-    // FIXME: Implement auto-initialized output.
-    u8 command = 0xb0;
-
-    u16 sample_count = length / sizeof(i16);
-    if (mode & (u8)SampleFormat::Stereo)
-        sample_count /= 2;
-
-    sample_count -= 1;
-
-    cli();
-    enable_irq();
-
-    dsp_write(command);
-    dsp_write(mode);
-    dsp_write((u8)sample_count);
-    dsp_write((u8)(sample_count >> 8));
-
-    wait_for_irq();
-    return length;
-}
-
-}
diff --git a/Kernel/Devices/Audio/SB16.h b/Kernel/Devices/Audio/SB16.h
deleted file mode 100644
index 8d6e85d467..0000000000
--- a/Kernel/Devices/Audio/SB16.h
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
-
-#pragma once
-
-#include <Kernel/Devices/Audio/Controller.h>
-#include <Kernel/Devices/CharacterDevice.h>
-#include <Kernel/Interrupts/IRQHandler.h>
-#include <Kernel/Memory/PhysicalPage.h>
-#include <Kernel/PhysicalAddress.h>
-#include <Kernel/WaitQueue.h>
-
-namespace Kernel {
-
-class SB16;
-
-class SB16 final
-    : public AudioController
-    , public IRQHandler {
-
-public:
-    virtual ~SB16() override;
-
-    static ErrorOr<NonnullRefPtr<SB16>> try_detect_and_create();
-
-    virtual StringView purpose() const override { return "SB16"sv; }
-
-private:
-    // ^AudioController
-    virtual RefPtr<AudioChannel> audio_channel(u32 index) const override;
-    virtual ErrorOr<size_t> write(size_t channel_index, UserOrKernelBuffer const& data, size_t length) override;
-    virtual void detect_hardware_audio_channels(Badge<AudioManagement>) override;
-    virtual ErrorOr<void> set_pcm_output_sample_rate(size_t channel_index, u32 samples_per_second_rate) override;
-    virtual ErrorOr<u32> get_pcm_output_sample_rate(size_t channel_index) override;
-
-    SB16();
-
-    // ^IRQHandler
-    virtual bool handle_irq(const RegisterState&) override;
-
-    void initialize();
-    void wait_for_irq();
-    void dma_start(uint32_t length);
-    void set_sample_rate(uint16_t hz);
-    void dsp_write(u8 value);
-    static u8 dsp_read();
-    u8 get_irq_line();
-    void set_irq_register(u8 irq_number);
-    void set_irq_line(u8 irq_number);
-
-    OwnPtr<Memory::Region> m_dma_region;
-    int m_major_version { 0 };
-    u16 m_sample_rate { 44100 };
-
-    WaitQueue m_irq_queue;
-    RefPtr<AudioChannel> m_audio_channel;
-};
-}