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//
// 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/IRQHandler.h>
#include <Kernel/Lock.h>
#include <Kernel/PCI/Access.h>
#include <Kernel/VM/PhysicalAddress.h>
#include <Kernel/VM/PhysicalPage.h>
#include <Kernel/WaitQueue.h>
struct PhysicalRegionDescriptor {
PhysicalAddress offset;
u16 size { 0 };
u16 end_of_table { 0 };
};
class PATADiskDevice;
class PATAChannel final : public IRQHandler {
friend class PATADiskDevice;
AK_MAKE_ETERNAL
public:
enum class ChannelType : u8 {
Primary,
Secondary
};
public:
static OwnPtr<PATAChannel> create(ChannelType type, bool force_pio);
PATAChannel(ChannelType type, bool force_pio);
virtual ~PATAChannel() override;
RefPtr<PATADiskDevice> master_device() { return m_master; };
RefPtr<PATADiskDevice> slave_device() { return m_slave; };
private:
//^ IRQHandler
virtual void handle_irq() 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);
// Data members
u8 m_channel_number { 0 }; // Channel number. 0 = master, 1 = slave
u16 m_io_base { 0x1F0 };
u16 m_control_base { 0 };
volatile u8 m_device_error { 0 };
WaitQueue m_irq_queue;
PCI::Address m_pci_address;
PhysicalRegionDescriptor m_prdt;
RefPtr<PhysicalPage> m_dma_buffer_page;
u16 m_bus_master_base { 0 };
Lockable<bool> m_dma_enabled;
RefPtr<PATADiskDevice> m_master;
RefPtr<PATADiskDevice> m_slave;
};
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