// license:BSD-3-Clause
// copyright-holders:smf
/*
* zs01.h
*
* Secure SerialFlash
*
*/
#pragma once
#ifndef __ZS01_H__
#define __ZS01_H__
#include "machine/ds2401.h"
#define MCFG_ZS01_ADD( _tag ) \
MCFG_DEVICE_ADD( _tag, ZS01, 0 )
#define MCFG_ZS01_DS2401( ds2401_tag ) \
zs01_device::static_set_ds2401_tag( *device, ds2401_tag );
class zs01_device : public device_t,
public device_nvram_interface
{
public:
// construction/destruction
zs01_device( const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock );
// inline configuration helpers
static void static_set_ds2401_tag( device_t &device, const char *ds2401_tag ) { downcast<zs01_device &>( device ).m_ds2401_tag = ds2401_tag; }
DECLARE_WRITE_LINE_MEMBER( write_cs );
DECLARE_WRITE_LINE_MEMBER( write_rst );
DECLARE_WRITE_LINE_MEMBER( write_scl );
DECLARE_WRITE_LINE_MEMBER( write_sda );
DECLARE_READ_LINE_MEMBER( read_sda );
protected:
// device-level overrides
virtual void device_start() override;
// device_nvram_interface overrides
virtual void nvram_default() override;
virtual void nvram_read( emu_file &file ) override;
virtual void nvram_write( emu_file &file ) override;
private:
inline void ATTR_PRINTF( 3, 4 ) verboselog( int n_level, const char *s_fmt, ... );
void decrypt( uint8_t *destination, uint8_t *source, int length, uint8_t *key, uint8_t previous_byte );
void decrypt2( uint8_t *destination, uint8_t *source, int length, uint8_t *key, uint8_t previous_byte );
void encrypt( uint8_t *destination, uint8_t *source, int length, uint8_t *key, uint32_t previous_byte );
uint16_t calc_crc( uint8_t *buffer, uint32_t length );
int data_offset();
enum size_t
{
SIZE_DATA_BUFFER = 8
};
enum command_t
{
COMMAND_WRITE = 0x00,
COMMAND_READ = 0x01
};
enum state_t
{
STATE_STOP,
STATE_RESPONSE_TO_RESET,
STATE_LOAD_COMMAND,
STATE_READ_DATA
};
// internal state
const char *m_ds2401_tag;
optional_memory_region m_region;
int m_cs;
int m_rst;
int m_scl;
int m_sdaw;
int m_sdar;
int m_state;
int m_shift;
int m_bit;
int m_byte;
uint8_t m_write_buffer[ 12 ];
uint8_t m_read_buffer[ 12 ];
uint8_t m_response_key[ 8 ];
uint8_t m_response_to_reset[ 4 ];
uint8_t m_command_key[ 8 ];
uint8_t m_data_key[ 8 ];
uint8_t m_data[ 4096 ];
ds2401_device *m_ds2401;
};
// device type definition
extern const device_type ZS01;
#endif