// license:BSD-3-Clause
// copyright-holders:Curt Coder
/***************************************************************************
Intel 8257 DMA Controller emulation
****************************************************************************
_____ _____
_I/OR 1 |* \_/ | 40 A7
_I/OW 2 | | 39 A6
_MEMR 3 | | 38 A5
_MEMW 4 | | 37 A4
MARK 5 | | 36 TC
READY 6 | | 35 A3
HLDA 7 | | 34 A2
ADSTB 8 | | 33 A1
AEN 9 | | 32 A0
HRQ 10 | 8257 | 31 Vcc
_CS 11 | | 30 D0
CLK 12 | | 29 D1
RESET 13 | | 28 D2
_DACK2 14 | | 27 D3
_DACK3 15 | | 26 D4
DRQ3 16 | | 25 _DACK0
DRQ2 17 | | 24 _DACK1
DRQ1 18 | | 23 D5
DRQ0 19 | | 22 D6
GND 20 |_____________| 21 D7
***************************************************************************/
#pragma once
#ifndef __I8257__
#define __I8257__
/***************************************************************************
DEVICE CONFIGURATION MACROS
***************************************************************************/
#define MCFG_I8257_OUT_HRQ_CB(_devcb) \
devcb = &i8257_device::set_out_hrq_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_OUT_TC_CB(_devcb) \
devcb = &i8257_device::set_out_tc_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_IN_MEMR_CB(_devcb) \
devcb = &i8257_device::set_in_memr_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_OUT_MEMW_CB(_devcb) \
devcb = &i8257_device::set_out_memw_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_IN_IOR_0_CB(_devcb) \
devcb = &i8257_device::set_in_ior_0_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_IN_IOR_1_CB(_devcb) \
devcb = &i8257_device::set_in_ior_1_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_IN_IOR_2_CB(_devcb) \
devcb = &i8257_device::set_in_ior_2_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_IN_IOR_3_CB(_devcb) \
devcb = &i8257_device::set_in_ior_3_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_OUT_IOW_0_CB(_devcb) \
devcb = &i8257_device::set_out_iow_0_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_OUT_IOW_1_CB(_devcb) \
devcb = &i8257_device::set_out_iow_1_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_OUT_IOW_2_CB(_devcb) \
devcb = &i8257_device::set_out_iow_2_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_OUT_IOW_3_CB(_devcb) \
devcb = &i8257_device::set_out_iow_3_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_OUT_DACK_0_CB(_devcb) \
devcb = &i8257_device::set_out_dack_0_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_OUT_DACK_1_CB(_devcb) \
devcb = &i8257_device::set_out_dack_1_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_OUT_DACK_2_CB(_devcb) \
devcb = &i8257_device::set_out_dack_2_callback(*device, DEVCB_##_devcb);
#define MCFG_I8257_OUT_DACK_3_CB(_devcb) \
devcb = &i8257_device::set_out_dack_3_callback(*device, DEVCB_##_devcb);
// HACK: the radio86 and alikes require this, is it a bug in the soviet clone or is there something else happening?
#define MCFG_I8257_REVERSE_RW_MODE(_flag) \
i8257_device::static_set_reverse_rw_mode(*device, _flag);
// ======================> i8257_device
class i8257_device : public device_t,
public device_execute_interface
{
public:
// construction/destruction
i8257_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
DECLARE_READ8_MEMBER( read );
DECLARE_WRITE8_MEMBER( write );
DECLARE_WRITE_LINE_MEMBER( hlda_w );
DECLARE_WRITE_LINE_MEMBER( ready_w );
DECLARE_WRITE_LINE_MEMBER( dreq0_w );
DECLARE_WRITE_LINE_MEMBER( dreq1_w );
DECLARE_WRITE_LINE_MEMBER( dreq2_w );
DECLARE_WRITE_LINE_MEMBER( dreq3_w );
template<class _Object> static devcb_base &set_out_hrq_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_out_hrq_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_tc_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_out_tc_cb.set_callback(object); }
template<class _Object> static devcb_base &set_in_memr_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_in_memr_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_memw_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_out_memw_cb.set_callback(object); }
template<class _Object> static devcb_base &set_in_ior_0_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_in_ior_0_cb.set_callback(object); }
template<class _Object> static devcb_base &set_in_ior_1_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_in_ior_1_cb.set_callback(object); }
template<class _Object> static devcb_base &set_in_ior_2_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_in_ior_2_cb.set_callback(object); }
template<class _Object> static devcb_base &set_in_ior_3_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_in_ior_3_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_iow_0_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_out_iow_0_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_iow_1_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_out_iow_1_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_iow_2_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_out_iow_2_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_iow_3_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_out_iow_3_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_dack_0_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_out_dack_0_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_dack_1_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_out_dack_1_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_dack_2_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_out_dack_2_cb.set_callback(object); }
template<class _Object> static devcb_base &set_out_dack_3_callback(device_t &device, _Object object) { return downcast<i8257_device &>(device).m_out_dack_3_cb.set_callback(object); }
static void static_set_reverse_rw_mode(device_t &device, bool flag) { downcast<i8257_device &>(device).m_reverse_rw = flag; }
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual void execute_run() override;
int m_icount;
private:
inline void dma_request(int channel, int state);
inline bool is_request_active(int channel);
inline void set_hreq(int state);
inline void set_dack();
inline void dma_read();
inline void dma_write();
inline void advance();
inline void set_tc(int state);
bool next_channel();
bool m_reverse_rw;
bool m_tc;
int m_msb;
int m_hreq;
int m_hack;
int m_ready;
int m_state;
int m_current_channel;
int m_last_channel;
uint8_t m_transfer_mode;
uint8_t m_status;
uint8_t m_request;
uint8_t m_temp;
devcb_write_line m_out_hrq_cb;
devcb_write_line m_out_tc_cb;
/* accessors to main memory */
devcb_read8 m_in_memr_cb;
devcb_write8 m_out_memw_cb;
/* channel accessors */
devcb_read8 m_in_ior_0_cb;
devcb_read8 m_in_ior_1_cb;
devcb_read8 m_in_ior_2_cb;
devcb_read8 m_in_ior_3_cb;
devcb_write8 m_out_iow_0_cb;
devcb_write8 m_out_iow_1_cb;
devcb_write8 m_out_iow_2_cb;
devcb_write8 m_out_iow_3_cb;
devcb_write_line m_out_dack_0_cb;
devcb_write_line m_out_dack_1_cb;
devcb_write_line m_out_dack_2_cb;
devcb_write_line m_out_dack_3_cb;
struct
{
uint16_t m_address;
uint16_t m_count;
uint8_t m_mode;
} m_channel[4];
};
// device type definition
extern const device_type I8257;
#endif