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-rw-r--r--src/mame/apple/scsidma.h57
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diff --git a/src/mame/apple/scsidma.h b/src/mame/apple/scsidma.h
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+// license:BSD-3-Clause
+// copyright-holders:R. Belmont
+
+#ifndef MAME_APPLE_SCSIDMA_H
+#define MAME_APPLE_SCSIDMA_H
+
+#pragma once
+
+#include "cpu/m68000/m68030.h"
+#include "machine/ncr5380.h"
+
+class scsidma_device : public device_t
+{
+public:
+ // construction/destruction
+ scsidma_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock);
+
+ template <typename... T> void set_maincpu_tag(T &&... args) { m_maincpu.set_tag(std::forward<T>(args)...); }
+
+ auto write_irq() { return m_irq.bind(); }
+
+ void map(address_map &map) ATTR_COLD;
+
+protected:
+ // device-level overrides
+ virtual void device_start() override ATTR_COLD;
+ virtual void device_reset() override ATTR_COLD;
+ virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
+
+ required_device<m68000_musashi_device> m_maincpu;
+ required_device<nscsi_bus_device> m_scsibus;
+ required_device<ncr53c80_device> m_ncr;
+
+ devcb_write_line m_irq;
+
+private:
+ void scsi_irq_w(int state);
+ void scsi_drq_w(int state);
+
+ u8 scsi_r(offs_t offset);
+ void scsi_w(offs_t offset, u8 data);
+ u32 control_r();
+ void control_w(u32 data);
+ u32 handshake_r(offs_t offset, u32 mem_mask);
+ void handshake_w(offs_t offset, u32 data, u32 mem_mask);
+
+ s32 m_drq, m_scsi_irq;
+ u32 m_control;
+ u32 m_holding;
+ u8 m_holding_remaining;
+ bool m_is_write, m_drq_completed;
+};
+
+// device type definition
+DECLARE_DEVICE_TYPE(SCSIDMA, scsidma_device)
+
+#endif // MAME_APPLE_SCSIDMA_H