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// license:BSD-3-Clause
// copyright-holders:R. Belmont
/*
* ncr5380.h SCSI controller
*
*/
#ifndef MAME_MACHINE_NCR5380_H
#define MAME_MACHINE_NCR5380_H
#pragma once
#include "legscsi.h"
// 5380 registers
enum
{
R5380_CURDATA = 0, // current SCSI data (read only)
R5380_OUTDATA = 0, // output data (write only)
R5380_INICOMMAND, // initiator command
R5380_MODE, // mode
R5380_TARGETCMD, // target command
R5380_SELENABLE, // select enable (write only)
R5380_BUSSTATUS = R5380_SELENABLE, // bus status (read only)
R5380_STARTDMA, // start DMA send (write only)
R5380_BUSANDSTAT = R5380_STARTDMA, // bus and status (read only)
R5380_DMATARGET, // DMA target (write only)
R5380_INPUTDATA = R5380_DMATARGET, // input data (read only)
R5380_DMAINIRECV, // DMA initiator receive (write only)
R5380_RESETPARITY = R5380_DMAINIRECV // reset parity/interrupt (read only)
};
// special Mac Plus registers - they implemented it weird
#define R5380_OUTDATA_DTACK (R5380_OUTDATA | 0x10)
#define R5380_CURDATA_DTACK (R5380_CURDATA | 0x10)
// device stuff
#define MCFG_NCR5380_IRQ_CB(_devcb) \
downcast<ncr5380_device &>(*device).set_irq_callback(DEVCB_##_devcb);
class ncr5380_device : public legacy_scsi_host_adapter
{
public:
// construction/destruction
ncr5380_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
template <class Object> devcb_base &set_irq_callback(Object &&cb) { return m_irq_cb.set_callback(std::forward<Object>(cb)); }
// our API
uint8_t ncr5380_read_reg(uint32_t offset);
void ncr5380_write_reg(uint32_t offset, uint8_t data);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
virtual void device_stop() override;
private:
uint8_t m_5380_Registers[8];
uint8_t m_last_id;
uint8_t m_5380_Command[32];
int32_t m_cmd_ptr, m_d_ptr, m_d_limit, m_next_req_flag;
uint8_t m_5380_Data[512];
devcb_write_line m_irq_cb; /* irq callback */
};
// device type definition
DECLARE_DEVICE_TYPE(NCR5380, ncr5380_device)
#endif // MAME_MACHINE_NCR5380_H
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