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Kernel: Add support for SD host controllers on the PCI bus

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Marco Cutecchia 2023-03-23 21:31:01 +01:00 • committed by Andrew Kaster
parent 47cae8005f
commit 5fe6c6fc24
5 changed files with 124 additions and 5 deletions
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50
Kernel/Storage/SD/PCISDHostController.h Normal file
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/*
* Copyright (c) 2023, the SerenityOS developers.
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <Kernel/Bus/PCI/API.h>
#include <Kernel/Bus/PCI/Device.h>
#include <Kernel/Memory/TypedMapping.h>
#include <Kernel/Storage/SD/SDHostController.h>
namespace Kernel {
class PCISDHostController : public PCI::Device
, public SDHostController {
public:
static ErrorOr<NonnullRefPtr<PCISDHostController>> try_initialize(PCI::DeviceIdentifier const& device_identifier);
// ^PCI::Device
virtual StringView device_name() const override { return "SD Host Controller"sv; }
protected:
// ^SDHostController
virtual SD::HostControlRegisterMap volatile* get_register_map_base_address() override { return m_registers.ptr(); }
private:
PCISDHostController(PCI::DeviceIdentifier const& device_identifier);
struct [[gnu::packed]] SlotInformationRegister {
u8 first_bar_number : 3;
u8 : 1;
u8 number_of_slots : 3;
u8 : 1;
u8 slots_available() const { return number_of_slots + 1; }
};
static_assert(AssertSize<SlotInformationRegister, 1>());
SlotInformationRegister read_slot_information() const
{
SpinlockLocker locker(device_identifier().operation_lock());
return bit_cast<SlotInformationRegister>(PCI::Access::the().read8_field(device_identifier(), 0x40));
}
Memory::TypedMapping<SD::HostControlRegisterMap volatile> m_registers;
};
}