// license:BSD-3-Clause
// copyright-holders:Barry Rodewald
/*
X68000 Custom SASI HD controller
*/
#ifndef MAME_MACHINE_X68K_HDC_H
#define MAME_MACHINE_X68K_HDC_H
#pragma once
class x68k_hdc_image_device : public device_t,
public device_image_interface
{
enum class sasi_phase : u8
{
BUSFREE = 0,
ARBITRATION,
SELECTION,
RESELECTION,
COMMAND,
DATA,
STATUS,
MESSAGE,
READ,
WRITE
};
// SASI commands, based on the SASI standard
enum sasi_cmd : u8
{
// Class 0 (6-byte) commands
SASI_CMD_TEST_UNIT_READY = 0,
SASI_CMD_REZERO_UNIT,
SASI_CMD_RESERVED_02,
SASI_CMD_REQUEST_SENSE,
SASI_CMD_FORMAT_UNIT,
SASI_CMD_RESERVED_05,
SASI_CMD_FORMAT_UNIT_06, // the X68000 uses command 0x06 for Format Unit, despite the SASI specs saying 0x04
SASI_CMD_RESERVED_07,
SASI_CMD_READ,
SASI_CMD_RESERVED_09,
SASI_CMD_WRITE,
SASI_CMD_SEEK,
SASI_CMD_RESERVED_0C,
SASI_CMD_RESERVED_0D,
SASI_CMD_RESERVED_0E,
SASI_CMD_WRITE_FILE_MARK,
SASI_CMD_INVALID_10,
SASI_CMD_INVALID_11,
SASI_CMD_RESERVE_UNIT,
SASI_CMD_RELEASE_UNIT,
SASI_CMD_INVALID_14,
SASI_CMD_INVALID_15,
SASI_CMD_READ_CAPACITY,
SASI_CMD_INVALID_17,
SASI_CMD_INVALID_18,
SASI_CMD_INVALID_19,
SASI_CMD_READ_DIAGNOSTIC,
SASI_CMD_WRITE_DIAGNOSTIC,
SASI_CMD_INVALID_1C,
SASI_CMD_INVALID_1D,
SASI_CMD_INVALID_1E,
SASI_CMD_INQUIRY,
// Class 1 commands (yes, just the one)
SASI_CMD_RESERVED_20,
SASI_CMD_RESERVED_21,
SASI_CMD_RESERVED_22,
SASI_CMD_SET_BLOCK_LIMITS = 0x28,
// Class 2 commands
SASI_CMD_EXTENDED_ADDRESS_READ = 0x48,
SASI_CMD_INVALID_49,
SASI_CMD_EXTENDED_ADDRESS_WRITE,
SASI_CMD_WRITE_AND_VERIFY = 0x54,
SASI_CMD_VERIFY,
SASI_CMD_INVALID_56,
SASI_CMD_SEARCH_DATA_HIGH,
SASI_CMD_SEARCH_DATA_EQUAL,
SASI_CMD_SEARCH_DATA_LOW,
// controller-specific commands
SASI_CMD_SPECIFY = 0xc2
};
enum sasi_status : u8
{
SASI_STATUS_MSG = 1 << 4, // MSG
SASI_STATUS_CD = 1 << 3, // C/D (Command/Data)
SASI_STATUS_IO = 1 << 2, // I/O
SASI_STATUS_BSY = 1 << 1, // BSY
SASI_STATUS_REQ = 1 << 0 // REQ
};
public:
// construction/destruction
x68k_hdc_image_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
// image-level overrides
virtual iodevice_t image_type() const noexcept override { return IO_HARDDISK; }
virtual bool is_readable() const noexcept override { return true; }
virtual bool is_writeable() const noexcept override { return true; }
virtual bool is_creatable() const noexcept override { return true; }
virtual bool must_be_loaded() const noexcept override { return false; }
virtual bool is_reset_on_load() const noexcept override { return false; }
virtual const char *file_extensions() const noexcept override { return "hdf"; }
virtual const char *custom_instance_name() const noexcept override { return "sasihd"; }
virtual const char *custom_brief_instance_name() const noexcept override { return "sasi"; }
virtual image_init_result call_create(int format_type, util::option_resolution *format_options) override;
void hdc_w(offs_t offset, u16 data);
u16 hdc_r(offs_t offset);
protected:
// device-level overrides
virtual void device_start() override;
private:
TIMER_CALLBACK_MEMBER(req_timer_callback);
sasi_phase m_phase;
u8 m_status_port; // read at 0xe96003
u8 m_status; // status phase output
u8 m_command[10];
u8 m_sense[4];
u16 m_command_byte_count;
u16 m_command_byte_total;
u8 m_current_command;
u16 m_transfer_byte_count;
u16 m_transfer_byte_total;
emu_timer *m_req_timer;
};
// device type definition
DECLARE_DEVICE_TYPE(X68KHDC, x68k_hdc_image_device)
#endif // MAME_MACHINE_X68K_HDC_H