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// license:BSD-3-Clause
// copyright-holders:Juergen Buchmueller
/***************************************************************************
z80daisy.h
Z80/180 daisy chaining support functions.
***************************************************************************/
#pragma once
#ifndef __Z80DAISY_H__
#define __Z80DAISY_H__
//**************************************************************************
// CONSTANTS
//**************************************************************************
// these constants are returned from the irq_state function
const UINT8 Z80_DAISY_INT = 0x01; // interrupt request mask
const UINT8 Z80_DAISY_IEO = 0x02; // interrupt disable mask (IEO)
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> z80_daisy_config
struct z80_daisy_config
{
const char * devname; // name of the device
};
// ======================> device_z80daisy_interface
class device_z80daisy_interface : public device_interface
{
public:
// construction/destruction
device_z80daisy_interface(const machine_config &mconfig, device_t &device);
virtual ~device_z80daisy_interface();
// required operation overrides
virtual int z80daisy_irq_state() = 0;
virtual int z80daisy_irq_ack() = 0;
virtual void z80daisy_irq_reti() = 0;
};
// ======================> z80_daisy_chain
class z80_daisy_chain
{
public:
z80_daisy_chain();
void init(device_t *cpudevice, const z80_daisy_config *daisy);
bool present() const { return (m_daisy_list != nullptr); }
void reset();
int update_irq_state();
int call_ack_device();
void call_reti_device();
protected:
class daisy_entry
{
public:
daisy_entry(device_t *device);
daisy_entry * m_next; // next device
device_t * m_device; // associated device
device_z80daisy_interface * m_interface; // associated device's daisy interface
};
daisy_entry * m_daisy_list; // head of the daisy chain
};
#endif
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