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// license:BSD-3-Clause
// copyright-holders:Miodrag Milanovic
/**********************************************************************
Iskra Delta SASI Adapter
**********************************************************************/
#include "emu.h"
#include "sasi.h"
#include "bus/nscsi/devices.h"
#include "machine/nscsi_bus.h"
#include "machine/nscsi_cb.h"
namespace {
class idpartner_sasi_device :
public device_t,
public bus::idpartner::device_exp_card_interface
{
public:
// construction/destruction
idpartner_sasi_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
// device_t implementation
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;
u8 stat_r();
u8 data_r();
void ctrl_w(u8 data);
void data_w(u8 data);
void reset_w(u8 data);
void req_w(int state);
void io_w(int state);
private:
required_device<nscsi_bus_device> m_sasibus;
required_device<nscsi_callback_device> m_sasi;
int m_drq_enable;
int m_data_enable;
int m_prev_daq;
};
idpartner_sasi_device::idpartner_sasi_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, IDPARTNER_SASI, tag, owner, clock)
, bus::idpartner::device_exp_card_interface(mconfig, *this)
, m_sasibus(*this, "sasibus")
, m_sasi(*this, "sasibus:7:scsicb")
, m_drq_enable(0)
, m_data_enable(0)
, m_prev_daq(0)
{
}
/*----------------------------------
device_t implementation
----------------------------------*/
void idpartner_sasi_device::device_start()
{
m_bus->io().install_read_handler (0x10, 0x10, emu::rw_delegate(*this, FUNC(idpartner_sasi_device::stat_r))); // RDSTAT
m_bus->io().install_read_handler (0x11, 0x11, emu::rw_delegate(*this, FUNC(idpartner_sasi_device::data_r))); // RDDATA
m_bus->io().install_write_handler(0x10, 0x10, emu::rw_delegate(*this, FUNC(idpartner_sasi_device::ctrl_w))); // WRCONTR
m_bus->io().install_write_handler(0x11, 0x11, emu::rw_delegate(*this, FUNC(idpartner_sasi_device::data_w))); // WRDATA
m_bus->io().install_write_handler(0x12, 0x12, emu::rw_delegate(*this, FUNC(idpartner_sasi_device::reset_w))); // RESET
save_item(NAME(m_drq_enable));
save_item(NAME(m_data_enable));
save_item(NAME(m_prev_daq));
}
void idpartner_sasi_device::device_reset()
{
m_drq_enable = 0;
m_data_enable = 0;
m_prev_daq = 0;
m_bus->drq_w(0);
}
u8 idpartner_sasi_device::stat_r()
{
u8 data = (m_sasi->req_r() << 7)
| (m_sasi->io_r() << 6)
| (m_sasi->msg_r() << 5)
| (m_sasi->cd_r() << 4)
| (m_sasi->bsy_r() << 3);
return data;
}
u8 idpartner_sasi_device::data_r()
{
u8 data = m_sasi->read();
if (m_data_enable)
{
m_sasi->ack_w(1);
if (m_drq_enable)
{
m_bus->drq_w(0);
m_prev_daq = 0;
}
}
return data;
}
void idpartner_sasi_device::ctrl_w(u8 data)
{
m_sasi->write(BIT(data,0));
m_sasi->sel_w(BIT(data,0));
m_data_enable = BIT(data,1);
m_drq_enable = BIT(data,5);
if (m_data_enable && m_drq_enable)
{
m_bus->drq_w(m_sasi->req_r());
m_prev_daq = m_sasi->req_r();
} else {
if (m_prev_daq)
m_bus->drq_w(0);
m_prev_daq = 0;
}
}
void idpartner_sasi_device::data_w(u8 data)
{
m_sasi->write(data);
if (m_data_enable)
{
m_sasi->ack_w(1);
if (m_drq_enable)
{
m_bus->drq_w(0);
m_prev_daq = 0;
}
}
}
void idpartner_sasi_device::reset_w(u8 data)
{
m_sasi->rst_w(1);
m_sasi->rst_w(0);
}
void idpartner_sasi_device::req_w(int state)
{
m_sasi->ack_w(0);
if (m_data_enable && m_drq_enable)
{
m_bus->drq_w(state);
m_prev_daq = state;
}
}
void idpartner_sasi_device::io_w(int state)
{
if (state)
m_sasi->write(0); // clears latched data
}
void idpartner_sasi_device::device_add_mconfig(machine_config &config)
{
NSCSI_BUS(config, m_sasibus);
NSCSI_CONNECTOR(config, "sasibus:0", default_scsi_devices, "s1410", true);
NSCSI_CONNECTOR(config, "sasibus:7", default_scsi_devices, "scsicb", true)
.option_add_internal("scsicb", NSCSI_CB)
.machine_config(
[this] (device_t* device)
{
downcast<nscsi_callback_device&>(*device).req_callback().set(*this, FUNC(idpartner_sasi_device::req_w));
downcast<nscsi_callback_device&>(*device).io_callback().set(*this, FUNC(idpartner_sasi_device::io_w));
});
}
} // anonymous namespace
DEFINE_DEVICE_TYPE_PRIVATE(IDPARTNER_SASI, bus::idpartner::device_exp_card_interface, idpartner_sasi_device, "partner_sai", "Iskra Delta Partner SASI card")
|