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/***************************************************************************

    Sega X-Board hardware

****************************************************************************

    Copyright Aaron Giles
    All rights reserved.

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are
    met:

        * Redistributions of source code must retain the above copyright
          notice, this list of conditions and the following disclaimer.
        * 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.
        * Neither the name 'MAME' nor the names of its contributors may be
          used to endorse or promote products derived from this software
          without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY AARON GILES ''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 AARON GILES 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.

***************************************************************************/

#include "cpu/m68000/m68000.h"
#include "cpu/mcs51/mcs51.h"
#include "cpu/z80/z80.h"
#include "machine/segaic16.h"
#include "video/segaic16.h"
#include "video/sega16sp.h"


// ======================> segaxbd_state

class segaxbd_state : public sega_16bit_common_base
{
public:
	// construction/destruction
	segaxbd_state(const machine_config &mconfig, device_type type, const char *tag)
		: sega_16bit_common_base(mconfig, type, tag),
		  m_maincpu(*this, "maincpu"),
		  m_subcpu(*this, "subcpu"),
		  m_soundcpu(*this, "soundcpu"),
		  m_soundcpu2(*this, "soundcpu2"),
		  m_mcu(*this, "mcu"),
		  m_cmptimer_1(*this, "cmptimer_main"),
		  m_sprites(*this, "sprites"),
		  m_gprider_hack(false),
		  m_road_priority(1),
		  m_scanline_timer(NULL),
		  m_timer_irq_state(0),
		  m_vblank_irq_state(0),
		  m_loffire_sync(NULL),
		  m_lastsurv_mux(0)
	{
		memset(m_adc_reverse, 0, sizeof(m_adc_reverse));
		memset(m_iochip_regs, 0, sizeof(m_iochip_regs));
	}

	// compare/timer chip callbacks
	void timer_ack_callback();
	void sound_data_w(UINT8 data);

	// YM2151 chip callbacks
	DECLARE_WRITE_LINE_MEMBER( sound_cpu_irq );

	// main CPU read/write handlers
	DECLARE_READ16_MEMBER( adc_r );
	DECLARE_WRITE16_MEMBER( adc_w );
	UINT16 iochip_r(int which, int port, int inputval);
	DECLARE_READ16_MEMBER( iochip_0_r );
	DECLARE_WRITE16_MEMBER( iochip_0_w );
	DECLARE_READ16_MEMBER( iochip_1_r );
	DECLARE_WRITE16_MEMBER( iochip_1_w );
	DECLARE_WRITE16_MEMBER( iocontrol_w );

	// game-specific main CPU read/write handlers
	DECLARE_WRITE16_MEMBER( loffire_sync0_w );
	DECLARE_READ16_MEMBER( rascot_excs_r );
	DECLARE_WRITE16_MEMBER( rascot_excs_w );
	DECLARE_READ16_MEMBER( smgp_excs_r );
	DECLARE_WRITE16_MEMBER( smgp_excs_w );

	// sound Z80 CPU read/write handlers
	DECLARE_READ8_MEMBER( sound_data_r );

	// game-specific driver init
	DECLARE_DRIVER_INIT(generic);
	DECLARE_DRIVER_INIT(aburner2);
	DECLARE_DRIVER_INIT(lastsurv);
	DECLARE_DRIVER_INIT(loffire);
	DECLARE_DRIVER_INIT(smgp);
	DECLARE_DRIVER_INIT(rascot);
	DECLARE_DRIVER_INIT(gprider);

	// video updates
	UINT32 screen_update(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);

protected:
	// internal types
	typedef delegate<UINT8 (UINT8)> ioread_delegate;
	typedef delegate<void (UINT8)> iowrite_delegate;

	// timer IDs
	enum
	{
		TID_SCANLINE,
		TID_IRQ2_GEN,
		TID_SOUND_WRITE
	};

	// device overrides
	virtual void machine_reset();
	virtual void video_start();
	virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);

	// internal helpers
	void update_main_irqs();
	static void m68k_reset_callback(device_t *device);

	// custom I/O
	void generic_iochip0_lamps_w(UINT8 data);
	UINT8 aburner2_iochip0_motor_r(UINT8 data);
	void aburner2_iochip0_motor_w(UINT8 data);
	UINT8 smgp_iochip0_motor_r(UINT8 data);
	void smgp_iochip0_motor_w(UINT8 data);
	UINT8 lastsurv_iochip1_port_r(UINT8 data);
	void lastsurv_iochip0_muxer_w(UINT8 data);

	// devices
	required_device<m68000_device> m_maincpu;
	required_device<m68000_device> m_subcpu;
	required_device<z80_device> m_soundcpu;
	optional_device<z80_device> m_soundcpu2;
	optional_device<i8751_device> m_mcu;
	required_device<sega_315_5250_compare_timer_device> m_cmptimer_1;
	required_device<sega_xboard_sprite_device> m_sprites;

	// configuration
	bool			m_gprider_hack;
	bool			m_adc_reverse[8];
	ioread_delegate	m_iochip_custom_io_r[2][8];
	iowrite_delegate m_iochip_custom_io_w[2][8];
	UINT8			m_road_priority;

	// internal state
	emu_timer *		m_scanline_timer;
	UINT8			m_timer_irq_state;
	UINT8			m_vblank_irq_state;
	UINT8			m_iochip_regs[2][8];

	// game-specific state
	UINT16 *		m_loffire_sync;
	UINT8			m_lastsurv_mux;
};