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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
/*********************************************************************
Apple SWIM3 floppy disk controller
*********************************************************************/
#ifndef MAME_MACHINE_SWIM3_H
#define MAME_MACHINE_SWIM3_H
#pragma once
#include "applefdintf.h"
#include "machine/fdc_pll.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
class swim3_device : public applefdintf_device
{
public:
// construction/destruction
swim3_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
auto irq_cb() { return m_irq_cb.bind(); }
auto drq_cb() { return m_drq_cb.bind(); }
virtual u8 read(offs_t offset) override;
virtual void write(offs_t offset, u8 data) override;
// For direct dma access
u8 dma_r();
void dma_w(u8 data);
virtual void set_floppy(floppy_image_device *floppy) override;
virtual floppy_image_device *get_floppy() const override;
virtual void sync() override;
protected:
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
TIMER_CALLBACK_MEMBER(update);
private:
enum {
S_IDLE,
S_STEP,
S_STEP_1,
S_STEP_0,
S_STEP_DONE,
S_ID,
};
enum {
L_IDLE,
L_GCR_SEARCH_ID,
L_MFM_SEARCH_ID,
L_MFM_SCAN_ID,
L_MFM_READ_ID,
L_MFM_READ_ID_BYTE,
L_MFM_SEARCH_DATA,
L_MFM_SCAN_DATA,
L_MFM_READ_DATA,
L_MFM_READ_DATA_BYTE,
};
struct live_info {
attotime tm;
fdc_pll_t pll;
int state, next_state;
u16 shift_reg;
u16 crc;
int bit_counter;
bool data_separator_phase, data_bit_context;
uint8_t data_reg;
};
devcb_write_line m_irq_cb, m_drq_cb;
emu_timer *m_timer;
floppy_image_device *m_floppy;
live_info m_cur_live, m_checkpoint_live;
u8 m_param;
u8 m_mode, m_setup, m_irq, m_imask, m_step, m_error;
u8 m_cur_track, m_cur_sector, m_cur_format;
u8 m_gap, m_sect1, m_xfer, m_fifo[2], m_fifo_pos;
bool m_drq_write;
int m_state;
void update_irq();
void update_drq();
void index_callback(floppy_image_device *floppy, int state);
void run(bool timeout, bool index);
void delay(int);
void checkpoint();
void rollback();
void live_abort();
void live_delay(int state);
bool read_one_bit(const attotime &limit);
bool write_one_bit(const attotime &limit);
void live_start(int state, bool start_writing = false);
void live_run(attotime limit = attotime::never);
void fifo_push(u8 data);
u8 fifo_pop();
void show_mode() const;
};
DECLARE_DEVICE_TYPE(SWIM3, swim3_device)
#endif /* MAME_MACHINE_SWIM3_H */
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