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https://github.com/SerenityOS/serenity
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5d180d1f99
(...and ASSERT_NOT_REACHED => VERIFY_NOT_REACHED) Since all of these checks are done in release builds as well, let's rename them to VERIFY to prevent confusion, as everyone is used to assertions being compiled out in release. We can introduce a new ASSERT macro that is specifically for debug checks, but I'm doing this wholesale conversion first since we've accumulated thousands of these already, and it's not immediately obvious which ones are suitable for ASSERT.
274 lines
8.5 KiB
C++
274 lines
8.5 KiB
C++
/*
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* Copyright (c) 2020, The SerenityOS developers.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <Kernel/ACPI/Parser.h>
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#include <Kernel/Devices/KeyboardDevice.h>
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#include <Kernel/Devices/PS2MouseDevice.h>
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#include <Kernel/IO.h>
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namespace Kernel {
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static I8042Controller* s_the;
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UNMAP_AFTER_INIT void I8042Controller::initialize()
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{
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if (ACPI::Parser::the()->have_8042())
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new I8042Controller;
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}
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I8042Controller& I8042Controller::the()
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{
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VERIFY(s_the);
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return *s_the;
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}
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UNMAP_AFTER_INIT I8042Controller::I8042Controller()
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{
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VERIFY(!s_the);
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s_the = this;
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u8 configuration;
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{
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ScopedSpinLock lock(m_lock);
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// Disable devices
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do_wait_then_write(I8042_STATUS, 0xad);
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do_wait_then_write(I8042_STATUS, 0xa7); // ignored if it doesn't exist
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// Drain buffers
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do_drain();
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do_wait_then_write(I8042_STATUS, 0x20);
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configuration = do_wait_then_read(I8042_BUFFER);
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do_wait_then_write(I8042_STATUS, 0x60);
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configuration &= ~3; // Disable IRQs for all
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do_wait_then_write(I8042_BUFFER, configuration);
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m_is_dual_channel = (configuration & (1 << 5)) != 0;
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dbgln("I8042: {} channel controller",
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m_is_dual_channel ? "Dual" : "Single");
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// Perform controller self-test
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do_wait_then_write(I8042_STATUS, 0xaa);
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if (do_wait_then_read(I8042_BUFFER) == 0x55) {
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// Restore configuration in case the controller reset
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do_wait_then_write(I8042_STATUS, 0x60);
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do_wait_then_write(I8042_BUFFER, configuration);
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} else {
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dbgln("I8042: Controller self test failed");
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}
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// Test ports and enable them if available
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do_wait_then_write(I8042_STATUS, 0xab); // test
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m_devices[0].available = (do_wait_then_read(I8042_BUFFER) == 0);
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if (m_devices[0].available) {
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do_wait_then_write(I8042_STATUS, 0xae); //enable
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configuration |= 1;
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configuration &= ~(1 << 4);
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} else {
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dbgln("I8042: Keyboard port not available");
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}
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if (m_is_dual_channel) {
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do_wait_then_write(I8042_STATUS, 0xa9); // test
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m_devices[1].available = (do_wait_then_read(I8042_BUFFER) == 0);
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if (m_devices[1].available) {
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do_wait_then_write(I8042_STATUS, 0xa8); // enable
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configuration |= 2;
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configuration &= ~(1 << 5);
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} else {
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dbgln("I8042: Mouse port not available");
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}
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}
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// Enable IRQs for the ports that are usable
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if (m_devices[0].available || m_devices[1].available) {
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configuration &= ~0x30; // renable clocks
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do_wait_then_write(I8042_STATUS, 0x60);
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do_wait_then_write(I8042_BUFFER, configuration);
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}
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}
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// Try to detect and initialize the devices
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if (m_devices[0].available) {
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if (KeyboardDevice::the().initialize()) {
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m_devices[0].device = &KeyboardDevice::the();
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} else {
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dbgln("I8042: Keyboard device failed to initialize, disable");
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m_devices[0].available = false;
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configuration &= ~1;
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configuration |= 1 << 4;
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ScopedSpinLock lock(m_lock);
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do_wait_then_write(I8042_STATUS, 0x60);
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do_wait_then_write(I8042_BUFFER, configuration);
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}
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}
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if (m_devices[1].available) {
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if (PS2MouseDevice::the().initialize()) {
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m_devices[1].device = &PS2MouseDevice::the();
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} else {
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dbgln("I8042: Mouse device failed to initialize, disable");
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m_devices[1].available = false;
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configuration |= 1 << 5;
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ScopedSpinLock lock(m_lock);
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do_wait_then_write(I8042_STATUS, 0x60);
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do_wait_then_write(I8042_BUFFER, configuration);
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}
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}
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// Enable IRQs after both are detected and initialized
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if (m_devices[0].device)
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m_devices[0].device->enable_interrupts();
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if (m_devices[1].device)
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m_devices[1].device->enable_interrupts();
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}
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void I8042Controller::irq_process_input_buffer(Device)
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{
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VERIFY(Processor::current().in_irq());
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u8 status = IO::in8(I8042_STATUS);
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if (!(status & I8042_BUFFER_FULL))
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return;
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Device data_for_device = ((status & I8042_WHICH_BUFFER) == I8042_MOUSE_BUFFER) ? Device::Mouse : Device::Keyboard;
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u8 byte = IO::in8(I8042_BUFFER);
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if (auto* device = m_devices[data_for_device == Device::Keyboard ? 0 : 1].device)
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device->irq_handle_byte_read(byte);
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}
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void I8042Controller::do_drain()
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{
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for (;;) {
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u8 status = IO::in8(I8042_STATUS);
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if (!(status & I8042_BUFFER_FULL))
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return;
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IO::in8(I8042_BUFFER);
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}
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}
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bool I8042Controller::do_reset_device(Device device)
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{
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VERIFY(device != Device::None);
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VERIFY(m_lock.is_locked());
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VERIFY(!Processor::current().in_irq());
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if (do_send_command(device, 0xff) != I8042_ACK)
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return false;
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// Wait until we get the self-test result
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return do_wait_then_read(I8042_BUFFER) == 0xaa;
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}
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u8 I8042Controller::do_send_command(Device device, u8 command)
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{
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VERIFY(device != Device::None);
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VERIFY(m_lock.is_locked());
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VERIFY(!Processor::current().in_irq());
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return do_write_to_device(device, command);
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}
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u8 I8042Controller::do_send_command(Device device, u8 command, u8 data)
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{
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VERIFY(device != Device::None);
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VERIFY(m_lock.is_locked());
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VERIFY(!Processor::current().in_irq());
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u8 response = do_write_to_device(device, command);
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if (response == I8042_ACK)
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response = do_write_to_device(device, data);
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return response;
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}
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u8 I8042Controller::do_write_to_device(Device device, u8 data)
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{
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VERIFY(device != Device::None);
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VERIFY(m_lock.is_locked());
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VERIFY(!Processor::current().in_irq());
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int attempts = 0;
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u8 response;
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do {
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if (device != Device::Keyboard) {
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prepare_for_output();
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IO::out8(I8042_STATUS, 0xd4);
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}
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prepare_for_output();
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IO::out8(I8042_BUFFER, data);
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response = do_wait_then_read(I8042_BUFFER);
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} while (response == I8042_RESEND && ++attempts < 3);
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if (attempts >= 3)
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dbgln("Failed to write byte to device, gave up");
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return response;
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}
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u8 I8042Controller::do_read_from_device(Device device)
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{
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VERIFY(device != Device::None);
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prepare_for_input(device);
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return IO::in8(I8042_BUFFER);
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}
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void I8042Controller::prepare_for_input(Device device)
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{
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VERIFY(m_lock.is_locked());
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const u8 buffer_type = device == Device::Keyboard ? I8042_KEYBOARD_BUFFER : I8042_MOUSE_BUFFER;
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for (;;) {
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u8 status = IO::in8(I8042_STATUS);
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if ((status & I8042_BUFFER_FULL) && (device == Device::None || ((status & I8042_WHICH_BUFFER) == buffer_type)))
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return;
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}
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}
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void I8042Controller::prepare_for_output()
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{
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VERIFY(m_lock.is_locked());
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for (;;) {
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if (!(IO::in8(I8042_STATUS) & 2))
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return;
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}
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}
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void I8042Controller::do_wait_then_write(u8 port, u8 data)
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{
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VERIFY(m_lock.is_locked());
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prepare_for_output();
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IO::out8(port, data);
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}
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u8 I8042Controller::do_wait_then_read(u8 port)
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{
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VERIFY(m_lock.is_locked());
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prepare_for_input(Device::None);
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return IO::in8(port);
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}
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}
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