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// license:BSD-3-Clause
// copyright-holders:AJR
#ifndef MAME_MACHINE_MACSCSI_H
#define MAME_MACHINE_MACSCSI_H
#pragma once
class mac_scsi_helper_device : public device_t
{
public:
// device type constructor
mac_scsi_helper_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
// callback configuration
auto scsi_read_callback() { return m_scsi_read_callback.bind(); }
auto scsi_write_callback() { return m_scsi_write_callback.bind(); }
auto scsi_dma_read_callback() { return m_scsi_dma_read_callback.bind(); }
auto scsi_dma_write_callback() { return m_scsi_dma_write_callback.bind(); }
auto cpu_halt_callback() { return m_cpu_halt_callback.bind(); }
auto timeout_error_callback() { return m_timeout_error_callback.bind(); }
// miscellaneous configuration
void set_timeout(attotime timeout) { m_timeout = timeout; }
// read/write handlers
u8 read_wrapper(bool pseudo_dma, offs_t offset);
void write_wrapper(bool pseudo_dma, offs_t offset, u8 data);
DECLARE_WRITE_LINE_MEMBER(drq_w);
protected:
// device-level overrides
virtual void device_resolve_objects() override;
virtual void device_start() override;
virtual void device_reset() override;
private:
enum class mode : u8 { NON_DMA, READ_WAIT_DRQ, READ_DMA, WRITE_DMA, BAD_DMA };
// internal helpers
void read_fifo_process();
void write_fifo_process();
TIMER_CALLBACK_MEMBER(timer_callback);
void dma_stop();
// callback objects
devcb_read8 m_scsi_read_callback;
devcb_write8 m_scsi_write_callback;
devcb_read8 m_scsi_dma_read_callback;
devcb_write8 m_scsi_dma_write_callback;
devcb_write_line m_cpu_halt_callback;
devcb_write8 m_timeout_error_callback;
// misc. parameters
attotime m_timeout;
// internal state
emu_timer *m_pseudo_dma_timer;
mode m_mode;
u8 m_read_fifo_bytes;
u8 m_write_fifo_bytes;
u32 m_read_fifo_data;
u32 m_write_fifo_data;
};
// device type declaration
DECLARE_DEVICE_TYPE(MAC_SCSI_HELPER, mac_scsi_helper_device)
#endif // MAME_MACHINE_MACSCSI_H
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