// license:BSD-3-Clause
// copyright-holders:Couriersud
/***************************************************************************
Zilog Z80 DMA Direct Memory Access Controller emulation
****************************************************************************
_____ _____
A5 1 |* \_/ | 40 A6
A4 2 | | 39 A7
A3 3 | | 38 IEI
A2 4 | | 37 _INT/_PULSE
A1 5 | | 36 IEO
A0 6 | | 35 D0
CLK 7 | | 34 D1
_WR 8 | | 33 D2
_RD 9 | | 32 D3
_IORQ 10 | Z8410 | 31 D4
+5V 11 | | 30 GND
_MREQ 12 | | 29 D5
_BAO 13 | | 28 D6
_BAI 14 | | 27 D7
_BUSREQ 15 | | 26 _M1
_CE/_WAIT 16 | | 25 RDY
A15 17 | | 24 A8
A14 18 | | 23 A9
A13 19 | | 22 A10
A12 20 |_____________| 21 A11
***************************************************************************/
#ifndef __Z80DMA__
#define __Z80DMA__
#include "cpu/z80/z80daisy.h"
//**************************************************************************
// DEVICE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_Z80DMA_OUT_BUSREQ_CB(_devcb) \
devcb = &z80dma_device::set_out_busreq_callback(*device, DEVCB_##_devcb);
#define MCFG_Z80DMA_OUT_INT_CB(_devcb) \
devcb = &z80dma_device::set_out_int_callback(*device, DEVCB_##_devcb);
#define MCFG_Z80DMA_OUT_BAO_CB(_devcb) \
devcb = &z80dma_device::set_out_bao_callback(*device, DEVCB_##_devcb);
#define MCFG_Z80DMA_IN_MREQ_CB(_devcb) \
devcb = &z80dma_device::set_in_mreq_callback(*device, DEVCB_##_devcb);
#define MCFG_Z80DMA_OUT_MREQ_CB(_devcb) \
devcb = &z80dma_device::set_out_mreq_callback(*device, DEVCB_##_devcb);
#define MCFG_Z80DMA_IN_IORQ_CB(_devcb) \
devcb = &z80dma_device::set_in_iorq_callback(*device, DEVCB_##_devcb);
#define MCFG_Z80DMA_OUT_IORQ_CB(_devcb) \
devcb = &z80dma_device::set_out_iorq_callback(*device, DEVCB_##_devcb);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> z80dma_device
class z80dma_device : public device_t,
public device_z80daisy_interface
{
public:
// construction/destruction
z80dma_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
template<class _Object> static devcb_base &set_out_busreq_callback(device_t &device, _Object object) { return downcast<z80dma_device &>(device).m_out_busreq_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_int_callback(device_t &device, _Object object) { return downcast<z80dma_device &>(device).m_out_int_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_bao_callback(device_t &device, _Object object) { return downcast<z80dma_device &>(device).m_out_bao_cb.set_callback(object); }
template<class _Object> static devcb_base &set_in_mreq_callback(device_t &device, _Object object) { return downcast<z80dma_device &>(device).m_in_mreq_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_mreq_callback(device_t &device, _Object object) { return downcast<z80dma_device &>(device).m_out_mreq_cb.set_callback(object); }
template<class _Object> static devcb_base &set_in_iorq_callback(device_t &device, _Object object) { return downcast<z80dma_device &>(device).m_in_iorq_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_iorq_callback(device_t &device, _Object object) { return downcast<z80dma_device &>(device).m_out_iorq_cb.set_callback(object); }
uint8_t read();
void write(uint8_t data);
DECLARE_READ8_MEMBER( read ) { return read(); }
DECLARE_WRITE8_MEMBER( write ) { write(data); }
DECLARE_WRITE_LINE_MEMBER(rdy_w);
DECLARE_WRITE_LINE_MEMBER(wait_w);
DECLARE_WRITE_LINE_MEMBER(bai_w);
private:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// device_z80daisy_interface overrides
virtual int z80daisy_irq_state() override;
virtual int z80daisy_irq_ack() override;
virtual void z80daisy_irq_reti() override;
// internal helpers
int is_ready();
void interrupt_check();
void trigger_interrupt(int level);
void do_read();
int do_write();
void do_transfer_write();
void do_search();
TIMER_CALLBACK_MEMBER(timerproc);
void update_status();
TIMER_CALLBACK_MEMBER(rdy_write_callback);
// internal state
devcb_write_line m_out_busreq_cb;
devcb_write_line m_out_int_cb;
devcb_write_line m_out_bao_cb;
devcb_read8 m_in_mreq_cb;
devcb_write8 m_out_mreq_cb;
devcb_read8 m_in_iorq_cb;
devcb_write8 m_out_iorq_cb;
emu_timer *m_timer;
uint16_t m_regs[(6<<3)+1+1];
uint8_t m_num_follow;
uint8_t m_cur_follow;
uint8_t m_regs_follow[5];
uint8_t m_read_num_follow;
uint8_t m_read_cur_follow;
uint8_t m_read_regs_follow[7];
uint8_t m_status;
uint8_t m_dma_enabled;
uint16_t m_addressA;
uint16_t m_addressB;
uint16_t m_count;
int m_rdy;
int m_force_ready;
uint8_t m_reset_pointer;
bool m_is_read;
uint8_t m_cur_cycle;
uint8_t m_latch;
// interrupts
int m_ip; // interrupt pending
int m_ius; // interrupt under service
uint8_t m_vector; // interrupt vector
};
// device type definition
extern const device_type Z80DMA;
#endif