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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************

    Commodore VIC-20 Expansion Port emulation

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

                    GND       1      A       GND
                    CD0       2      B       CA0
                    CD1       3      C       CA1
                    CD2       4      D       CA2
                    CD3       5      E       CA3
                    CD4       6      F       CA4
                    CD5       7      H       CA5
                    CD6       8      J       CA6
                    CD7       9      K       CA7
                  _BLK1      10      L       CA8
                  _BLK2      11      M       CA9
                  _BLK3      12      N       CA10
                  _BLK5      13      P       CA11
                  _RAM1      14      R       CA12
                  _RAM2      15      S       CA13
                  _RAM3      16      T       _I/O2
                  VR/_W      17      U       _I/O3
                  CR/_W      18      V       Sphi2
                   _IRQ      19      W       _NMI
                   N.C.      20      X       _RES
                    +5V      21      Y       N.C.
                    GND      22      Z       GND

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

#ifndef MAME_BUS_VIC20_EXP_H
#define MAME_BUS_VIC20_EXP_H

#pragma once

#include "softlist_dev.h"


//**************************************************************************
//  CONSTANTS
//**************************************************************************

#define VIC20_EXPANSION_SLOT_TAG        "exp"



//**************************************************************************
//  INTERFACE CONFIGURATION MACROS
//**************************************************************************

#define MCFG_VIC20_PASSTHRU_EXPANSION_SLOT_ADD(_tag) \
	MCFG_DEVICE_ADD(_tag, VIC20_EXPANSION_SLOT, DERIVED_CLOCK(1, 1), vic20_expansion_cards, nullptr) \
	MCFG_VIC20_EXPANSION_SLOT_IRQ_CALLBACK(WRITELINE(DEVICE_SELF_OWNER, vic20_expansion_slot_device, irq_w)) \
	MCFG_VIC20_EXPANSION_SLOT_NMI_CALLBACK(WRITELINE(DEVICE_SELF_OWNER, vic20_expansion_slot_device, nmi_w)) \
	MCFG_VIC20_EXPANSION_SLOT_RES_CALLBACK(WRITELINE(DEVICE_SELF_OWNER, vic20_expansion_slot_device, res_w))


#define MCFG_VIC20_EXPANSION_SLOT_IRQ_CALLBACK(_write) \
	devcb = &downcast<vic20_expansion_slot_device &>(*device).set_irq_wr_callback(DEVCB_##_write);

#define MCFG_VIC20_EXPANSION_SLOT_NMI_CALLBACK(_write) \
	devcb = &downcast<vic20_expansion_slot_device &>(*device).set_nmi_wr_callback(DEVCB_##_write);

#define MCFG_VIC20_EXPANSION_SLOT_RES_CALLBACK(_write) \
	devcb = &downcast<vic20_expansion_slot_device &>(*device).set_res_wr_callback(DEVCB_##_write);



//**************************************************************************
//  TYPE DEFINITIONS
//**************************************************************************

// ======================> vic20_expansion_slot_device

class device_vic20_expansion_card_interface;

class vic20_expansion_slot_device : public device_t,
									public device_slot_interface,
									public device_image_interface
{
public:
	// construction/destruction
	template <typename T>
	vic20_expansion_slot_device(machine_config const &mconfig, char const *tag, device_t *owner, uint32_t clock, T &&opts, char const *dflt)
		: vic20_expansion_slot_device(mconfig, tag, owner, clock)
	{
		option_reset();
		opts(*this);
		set_default_option(dflt);
		set_fixed(false);
	}
	vic20_expansion_slot_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);

	template <class Object> devcb_base &set_irq_wr_callback(Object &&cb) { return m_write_irq.set_callback(std::forward<Object>(cb)); }
	template <class Object> devcb_base &set_nmi_wr_callback(Object &&cb) { return m_write_nmi.set_callback(std::forward<Object>(cb)); }
	template <class Object> devcb_base &set_res_wr_callback(Object &&cb) { return m_write_res.set_callback(std::forward<Object>(cb)); }

	// computer interface
	uint8_t cd_r(address_space &space, offs_t offset, uint8_t data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3);
	void cd_w(address_space &space, offs_t offset, uint8_t data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3);

	// cartridge interface
	DECLARE_WRITE_LINE_MEMBER( irq_w ) { m_write_irq(state); }
	DECLARE_WRITE_LINE_MEMBER( nmi_w ) { m_write_nmi(state); }
	DECLARE_WRITE_LINE_MEMBER( res_w ) { m_write_res(state); }

protected:
	// device-level overrides
	virtual void device_validity_check(validity_checker &valid) const override;
	virtual void device_start() override;
	virtual void device_reset() override;

	// image-level overrides
	virtual image_init_result call_load() override;
	virtual const software_list_loader &get_software_list_loader() const override { return rom_software_list_loader::instance(); }

	virtual iodevice_t image_type() const override { return IO_CARTSLOT; }

	virtual bool is_readable()  const override { return 1; }
	virtual bool is_writeable() const override { return 0; }
	virtual bool is_creatable() const override { return 0; }
	virtual bool must_be_loaded() const override { return 0; }
	virtual bool is_reset_on_load() const override { return 1; }
	virtual const char *image_interface() const override { return "vic1001_cart"; }
	virtual const char *file_extensions() const override { return "20,40,60,70,a0,b0,crt"; }

	// slot interface overrides
	virtual std::string get_default_card_software(get_default_card_software_hook &hook) const override;

	devcb_write_line   m_write_irq;
	devcb_write_line   m_write_nmi;
	devcb_write_line   m_write_res;

	device_vic20_expansion_card_interface *m_card;
};


// ======================> device_vic20_expansion_card_interface

// class representing interface-specific live vic20_expansion card
class device_vic20_expansion_card_interface : public device_slot_card_interface
{
	friend class vic20_expansion_slot_device;

public:
	// construction/destruction
	virtual ~device_vic20_expansion_card_interface();

	virtual uint8_t vic20_cd_r(address_space &space, offs_t offset, uint8_t data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3) { return data; };
	virtual void vic20_cd_w(address_space &space, offs_t offset, uint8_t data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3) { };

protected:
	device_vic20_expansion_card_interface(const machine_config &mconfig, device_t &device);

	optional_shared_ptr<uint8_t> m_blk1;
	optional_shared_ptr<uint8_t> m_blk2;
	optional_shared_ptr<uint8_t> m_blk3;
	optional_shared_ptr<uint8_t> m_blk5;
	optional_shared_ptr<uint8_t> m_nvram;

	vic20_expansion_slot_device *m_slot;
};


// device type definition
DECLARE_DEVICE_TYPE(VIC20_EXPANSION_SLOT, vic20_expansion_slot_device)


void vic20_expansion_cards(device_slot_interface &device);

#endif // MAME_BUS_VIC20_EXP_H