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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************
Acorn AIV SCSI Host Adaptor
**********************************************************************/
#include "emu.h"
#include "scsiaiv.h"
#include "bus/nscsi/devices.h"
#include "machine/nscsi_bus.h"
#include "machine/nscsi_cb.h"
namespace {
class bbc_scsiaiv_device : public device_t, public device_bbc_modem_interface
{
public:
// construction/destruction
bbc_scsiaiv_device(const machine_config &mconfig, const char* tag, device_t* owner, uint32_t clock);
void bsy_w(int state);
void req_w(int state);
protected:
bbc_scsiaiv_device(const machine_config &mconfig, device_type type, const char* tag, device_t* owner, uint32_t clock)
: device_t(mconfig, type, tag, owner, clock)
, device_bbc_modem_interface(mconfig, *this)
, m_scsi(*this, "scsi:7:scsicb")
{
}
// device_t overrides
virtual void device_start() override ATTR_COLD;
// optional information overrides
virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
virtual uint8_t read(offs_t offset) override;
virtual void write(offs_t offset, uint8_t data) override;
private:
required_device<nscsi_callback_device> m_scsi;
int m_irq_enable;
int m_irq_state;
};
// ======================> bbc_vp415_device
//class bbc_vp415_device : public bbc_scsiaiv_device
//{
//public:
// // construction/destruction
// bbc_vp415_device(const machine_config &mconfig, const char* tag, device_t* owner, uint32_t clock);
//
//protected:
// // optional information overrides
// virtual void device_add_mconfig(machine_config &config) override ATTR_COLD;
//};
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void bbc_scsiaiv_device::device_add_mconfig(machine_config &config)
{
NSCSI_BUS(config, "scsi");
NSCSI_CONNECTOR(config, "scsi:0", default_scsi_devices, nullptr);
NSCSI_CONNECTOR(config, "scsi:7", default_scsi_devices, "scsicb", true)
.option_add_internal("scsicb", NSCSI_CB)
.machine_config([this](device_t* device) {
downcast<nscsi_callback_device&>(*device).bsy_callback().set(*this, FUNC(bbc_scsiaiv_device::bsy_w));
downcast<nscsi_callback_device&>(*device).req_callback().set(*this, FUNC(bbc_scsiaiv_device::req_w));
});
}
//void bbc_vp415_device::device_add_mconfig(machine_config &config)
//{
// bbc_scsiaiv_device::device_add_mconfig(config);
//
// // Philips VP415
// subdevice<nscsi_connector>("scsi:0")->set_default_option("vp415");
// subdevice<nscsi_connector>("scsi:0")->set_fixed(true);
//}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
//-------------------------------------------------
// bbc_scsiaiv_device - constructor
//-------------------------------------------------
bbc_scsiaiv_device::bbc_scsiaiv_device(const machine_config &mconfig, const char* tag, device_t* owner, uint32_t clock)
: bbc_scsiaiv_device(mconfig, BBC_SCSIAIV, tag, owner, clock)
{
}
//bbc_vp415_device::bbc_vp415_device(const machine_config &mconfig, const char* tag, device_t* owner, uint32_t clock)
// : bbc_scsiaiv_device(mconfig, BBC_VP415, tag, owner, clock)
//{
//}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void bbc_scsiaiv_device::device_start()
{
// register for save states
save_item(NAME(m_irq_enable));
save_item(NAME(m_irq_state));
}
//**************************************************************************
// IMPLEMENTATION
//**************************************************************************
uint8_t bbc_scsiaiv_device::read(offs_t offset)
{
uint8_t data = 0xff;
switch (offset & 0x07)
{
case 0x00:
data = m_scsi->read();
m_scsi->ack_w(1);
break;
case 0x01:
data = (m_scsi->msg_r() << 0)
| (m_scsi->bsy_r() << 1)
| (m_scsi->rst_r() << 2)
| (!m_irq_state << 4)
| (m_scsi->req_r() << 5)
| (m_scsi->io_r() << 6)
| (m_scsi->cd_r() << 7);
break;
}
return data;
}
void bbc_scsiaiv_device::write(offs_t offset, uint8_t data)
{
switch (offset & 0x07)
{
case 0x00:
m_scsi->write(~data);
m_scsi->ack_w(1);
break;
case 0x02:
m_scsi->sel_w(1);
break;
case 0x03:
m_irq_enable = BIT(data, 0);
break;
}
}
void bbc_scsiaiv_device::bsy_w(int state)
{
m_scsi->sel_w(0);
}
void bbc_scsiaiv_device::req_w(int state)
{
m_scsi->ack_w(0);
m_irq_state = (m_irq_enable && !state) ? 0 : 1;
m_slot->irq_w(m_irq_state ? CLEAR_LINE : ASSERT_LINE);
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(BBC_SCSIAIV, device_bbc_modem_interface, bbc_scsiaiv_device, "bbc_scsiaiv", "Acorn AIV SCSI Host Adaptor");
//DEFINE_DEVICE_TYPE_PRIVATE(BBC_VP415, device_bbc_modem_interface, bbc_vp415_device, "bbc_vp415", "BBC Philips VP415");
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