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