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Kernel/USB: Start fleshing out a basic UHCI controller driver :^)

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Let's see if we can talk to some USB devices. We will now detect
a UHCI controller if present on the PCI bus.
This commit is contained in:
Andreas Kling 2020-09-04 09:59:38 +02:00
parent 2e01f1f9b9
commit e834c24eea
5 changed files with 149 additions and 0 deletions
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77
Kernel/Devices/UHCIController.cpp Normal file
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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <Kernel/Devices/UHCIController.h>
namespace Kernel {
static constexpr u16 UHCI_HOST_CONTROLLER_RESET = 0x0002;
void UHCIController::detect()
{
PCI::enumerate([&](const PCI::Address& address, PCI::ID id) {
if (address.is_null())
return;
if (PCI::get_class(address) == 0xc && PCI::get_subclass(address) == 0x03 && PCI::get_programming_interface(address) == 0) {
new UHCIController(address, id);
}
});
}
UHCIController::UHCIController(PCI::Address address, PCI::ID id)
: PCI::Device(address)
, m_io_base(PCI::get_BAR4(pci_address()) & ~1)
{
klog() << "UHCI: Controller found " << id << " @ " << address;
klog() << "UHCI: I/O base " << m_io_base;
klog() << "UHCI: Interrupt line: " << PCI::get_interrupt_line(pci_address());
reset();
}
UHCIController::~UHCIController()
{
}
void UHCIController::reset()
{
write_usbcmd(UHCI_HOST_CONTROLLER_RESET);
for (;;) {
if (read_usbcmd() & UHCI_HOST_CONTROLLER_RESET)
continue;
break;
}
klog() << "UHCI: Reset completed!";
}
void UHCIController::handle_irq(const RegisterState&)
{
}
}