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/*
* Copyright (c) 2018-2020, 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.
*/
//
// Parallel ATA (PATA) controller driver
//
// This driver describes a logical PATA Channel. Each channel can connect up to 2
// IDE Hard Disk Drives. The drives themselves can be either the master drive (hd0)
// or the slave drive (hd1).
//
// More information about the ATA spec for PATA can be found here:
// ftp://ftp.seagate.com/acrobat/reference/111-1c.pdf
//
#pragma once
#include <AK/OwnPtr.h>
#include <AK/RefPtr.h>
#include <Kernel/IO.h>
#include <Kernel/Lock.h>
#include <Kernel/PCI/Access.h>
#include <Kernel/PCI/Device.h>
#include <Kernel/PhysicalAddress.h>
#include <Kernel/VM/PhysicalPage.h>
#include <Kernel/WaitQueue.h>
namespace Kernel {
struct PhysicalRegionDescriptor {
PhysicalAddress offset;
u16 size { 0 };
u16 end_of_table { 0 };
};
class PATADiskDevice;
class PATAChannel final : public PCI::Device {
friend class PATADiskDevice;
AK_MAKE_ETERNAL
public:
enum class ChannelType : u8 {
Primary,
Secondary
};
public:
static OwnPtr<PATAChannel> create(ChannelType type, bool force_pio);
PATAChannel(PCI::Address address, ChannelType type, bool force_pio);
virtual ~PATAChannel() override;
RefPtr<PATADiskDevice> master_device() { return m_master; };
RefPtr<PATADiskDevice> slave_device() { return m_slave; };
virtual const char* purpose() const override { return "PATA Channel"; }
private:
//^ IRQHandler
virtual void handle_irq(const RegisterState&) override;
void initialize(bool force_pio);
void detect_disks();
void wait_for_irq();
bool ata_read_sectors_with_dma(u32, u16, u8*, bool);
bool ata_write_sectors_with_dma(u32, u16, const u8*, bool);
bool ata_read_sectors(u32, u16, u8*, bool);
bool ata_write_sectors(u32, u16, const u8*, bool);
inline void prepare_for_irq();
// Data members
u8 m_channel_number { 0 }; // Channel number. 0 = master, 1 = slave
IOAddress m_io_base;
IOAddress m_control_base;
volatile u8 m_device_error { 0 };
WaitQueue m_irq_queue;
PhysicalRegionDescriptor& prdt() { return *reinterpret_cast<PhysicalRegionDescriptor*>(m_prdt_page->paddr().offset(0xc0000000).as_ptr()); }
RefPtr<PhysicalPage> m_prdt_page;
RefPtr<PhysicalPage> m_dma_buffer_page;
IOAddress m_bus_master_base;
Lockable<bool> m_dma_enabled;
RefPtr<PATADiskDevice> m_master;
RefPtr<PATADiskDevice> m_slave;
};
}
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