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Kernel: Implement a PCI Serial Device driver

This simple driver simply finds a device in a device definitions list
and then sets up a SerialDevice instance based on the definition.

The driver currently only supports "WCH CH382 2S" pci serial boards,
as that is the only device available for me to test with, but most
other pci serial devices should be as easily addable as adding a
board_definitions entry.
This commit is contained in:
Idan Horowitz 2021-04-23 17:26:52 +03:00 committed by Andreas Kling
parent 62f69cc50f
commit ba9b3dc656
7 changed files with 99 additions and 0 deletions

View file

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/*
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/Devices/PCISerialDevice.h>
namespace Kernel {
static SerialDevice* s_the = nullptr;
void PCISerialDevice::detect()
{
PCI::enumerate([&](const PCI::Address& address, PCI::ID id) {
if (address.is_null())
return;
// HACK: There's currently no way to break out of PCI::enumerate, so we just early return if we already initialized the pci serial device
if (is_available())
return;
for (auto& board_definition : board_definitions) {
if (board_definition.device_id != id)
continue;
auto bar_base = PCI::get_BAR(address, board_definition.pci_bar) & ~1;
// FIXME: We should support more than 1 PCI serial port (per card/multiple devices)
s_the = new SerialDevice(IOAddress(bar_base + board_definition.first_offset), 64);
if (board_definition.baud_rate != SerialDevice::Baud::Baud38400) // non-default baud
s_the->set_baud(board_definition.baud_rate);
dmesgln("PCISerialDevice: Found {} @ {}", board_definition.name, address);
return;
}
});
}
SerialDevice& PCISerialDevice::the()
{
VERIFY(s_the);
return *s_the;
}
bool PCISerialDevice::is_available()
{
return s_the;
}
}