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-rw-r--r--src/mame/machine/macscsi.h70
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diff --git a/src/mame/machine/macscsi.h b/src/mame/machine/macscsi.h
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+++ b/src/mame/machine/macscsi.h
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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