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// license:BSD-3-Clause
// copyright-holders:Robbbert
/***************************************************************************

Pulsar Little Big Board

2013-12-29 Skeleton driver.

Chips: Z80A @4MHz, Z80DART, FD1797-02, 8255A-5, AY-5-8116, MSM5832.
Crystals: 4 MHz, 5.0688 MHz, 32768.

This is a complete CP/M single-board computer. You needed to supply your own
power supply and serial terminal.

The terminal must be set for 9600 baud, 7 bits, even parity, 1 stop bit.


ToDo:
- Fix floppy. It needs to WAIT the cpu whenever port 0xD3 is read, wait
  for either DRQ or INTRQ to assert, then release the cpu and then do the
  actual port read. Our Z80 cannot do that.
- Fix FDC so MAME doesn't crash when a certain disk is inserted.


Monitor Commands:
B - Boot from disk
D - Dump memory
F - Fill memory
G - Go
I - In port
L - Load bootstrap from drive A to 0x80
M - Modify memory
O - Out port
P - choose which rs232 channel for the console
T - Test memory
V - Move memory
X - Test off-board memory banks

****************************************************************************/

#include "emu.h"
#include "bus/rs232/rs232.h"
#include "cpu/z80/z80.h"
#include "imagedev/floppy.h"
#include "machine/z80daisy.h"
#include "machine/z80dart.h"
#include "machine/msm5832.h"
#include "machine/i8255.h"
#include "machine/com8116.h"
#include "machine/wd_fdc.h"


class pulsar_state : public driver_device
{
public:
	pulsar_state(const machine_config &mconfig, device_type type, const char *tag)
		: driver_device(mconfig, type, tag)
		, m_maincpu(*this, "maincpu")
		, m_fdc (*this, "fdc")
		, m_floppy0(*this, "fdc:0")
		, m_floppy1(*this, "fdc:1")
		, m_rtc(*this, "rtc")
	{ }


	void pulsar(machine_config &config);

	void init_pulsar();

protected:
	virtual void machine_reset() override;

private:
	TIMER_CALLBACK_MEMBER(pulsar_reset);
	DECLARE_WRITE8_MEMBER(ppi_pa_w);
	DECLARE_WRITE8_MEMBER(ppi_pb_w);
	DECLARE_WRITE8_MEMBER(ppi_pc_w);
	DECLARE_READ8_MEMBER(ppi_pc_r);

	void io_map(address_map &map);
	void mem_map(address_map &map);

	floppy_image_device *m_floppy;
	required_device<z80_device> m_maincpu;
	required_device<fd1797_device> m_fdc;
	required_device<floppy_connector> m_floppy0;
	required_device<floppy_connector> m_floppy1;
	required_device<msm5832_device> m_rtc;
};

void pulsar_state::mem_map(address_map &map)
{
	map.unmap_value_high();
	map(0x0000, 0x07ff).bankr("bankr0").bankw("bankw0");
	map(0x0800, 0xf7ff).ram();
	map(0xf800, 0xffff).bankr("bankr1").bankw("bankw1");
}

void pulsar_state::io_map(address_map &map)
{
	map.unmap_value_high();
	map.global_mask(0xff);
	map(0xc0, 0xc3).mirror(0x0c).rw("dart", FUNC(z80dart_device::ba_cd_r), FUNC(z80dart_device::ba_cd_w));
	map(0xd0, 0xd3).mirror(0x0c).rw(m_fdc, FUNC(fd1797_device::read), FUNC(fd1797_device::write));
	map(0xe0, 0xe3).mirror(0x0c).rw("ppi", FUNC(i8255_device::read), FUNC(i8255_device::write));
	map(0xf0, 0xf0).mirror(0x0f).w("brg", FUNC(com8116_device::stt_str_w));
}


/* after the first 4 bytes have been read from ROM, switch the ram back in */
TIMER_CALLBACK_MEMBER( pulsar_state::pulsar_reset)
{
	membank("bankr0")->set_entry(1);
}

static const z80_daisy_config daisy_chain_intf[] =
{
	{ "dart" },
	{ nullptr }
};

/*
d0..d3 Drive select 0-3 (we only emulate 1 drive)
d4     Side select 0=side0
d5     /DDEN
d6     /DSK_WAITEN (don't know what this is, not emulated)
d7     XMEMEX line (for external memory, not emulated)
*/
WRITE8_MEMBER( pulsar_state::ppi_pa_w )
{
	m_floppy = nullptr;
	if (BIT(data, 0))
		m_floppy = m_floppy0->get_device();
	else
	if (BIT(data, 1))
		m_floppy = m_floppy1->get_device();
	m_fdc->set_floppy(m_floppy);
	m_fdc->dden_w(BIT(data, 5));
	if (m_floppy)
		m_floppy->mon_w(0);
}

/*
d0..d3 RTC address
d4     RTC read line
d5     RTC write line
d6     RTC hold line
d7     Allow 64k of ram
*/
WRITE8_MEMBER( pulsar_state::ppi_pb_w )
{
	m_rtc->address_w(data & 0x0f);
	m_rtc->read_w(BIT(data, 4));
	m_rtc->write_w(BIT(data, 5));
	m_rtc->hold_w(BIT(data, 6));
	membank("bankr1")->set_entry(BIT(data, 7));
}

// d0..d3 Data lines to rtc
WRITE8_MEMBER( pulsar_state::ppi_pc_w )
{
	m_rtc->data_w(space, 0, data & 15);
}

// d7     /2 SIDES
READ8_MEMBER( pulsar_state::ppi_pc_r )
{
	uint8_t data = 0;
	if (m_floppy)
		data = m_floppy->twosid_r() << 7;
	return m_rtc->data_r(space, 0) | data;
}

static DEVICE_INPUT_DEFAULTS_START( terminal )
	DEVICE_INPUT_DEFAULTS( "RS232_TXBAUD", 0xff, RS232_BAUD_9600 )
	DEVICE_INPUT_DEFAULTS( "RS232_RXBAUD", 0xff, RS232_BAUD_9600 )
	DEVICE_INPUT_DEFAULTS( "RS232_STARTBITS", 0xff, RS232_STARTBITS_1 )
	DEVICE_INPUT_DEFAULTS( "RS232_DATABITS", 0xff, RS232_DATABITS_7 )
	DEVICE_INPUT_DEFAULTS( "RS232_PARITY", 0xff, RS232_PARITY_EVEN )
	DEVICE_INPUT_DEFAULTS( "RS232_STOPBITS", 0xff, RS232_STOPBITS_1 )
DEVICE_INPUT_DEFAULTS_END

static void pulsar_floppies(device_slot_interface &device)
{
	device.option_add("flop", FLOPPY_8_DSDD);
}

/* Input ports */
static INPUT_PORTS_START( pulsar )
INPUT_PORTS_END

void pulsar_state::machine_reset()
{
	machine().scheduler().timer_set(attotime::from_usec(3), timer_expired_delegate(FUNC(pulsar_state::pulsar_reset),this));
	membank("bankr0")->set_entry(0); // point at rom
	membank("bankw0")->set_entry(0); // always write to ram
	membank("bankr1")->set_entry(1); // point at rom
	membank("bankw1")->set_entry(0); // always write to ram
	m_rtc->cs_w(1); // always enabled
}

void pulsar_state::init_pulsar()
{
	uint8_t *main = memregion("maincpu")->base();

	membank("bankr0")->configure_entry(1, &main[0x0000]);
	membank("bankr0")->configure_entry(0, &main[0x10000]);
	membank("bankw0")->configure_entry(0, &main[0x0000]);

	membank("bankr1")->configure_entry(0, &main[0xf800]);
	membank("bankr1")->configure_entry(1, &main[0x10000]);
	membank("bankw1")->configure_entry(0, &main[0xf800]);
}

void pulsar_state::pulsar(machine_config &config)
{
	/* basic machine hardware */
	Z80(config, m_maincpu, 4_MHz_XTAL);
	m_maincpu->set_addrmap(AS_PROGRAM, &pulsar_state::mem_map);
	m_maincpu->set_addrmap(AS_IO, &pulsar_state::io_map);
	m_maincpu->set_daisy_config(daisy_chain_intf);


	/* Devices */
	i8255_device &ppi(I8255(config, "ppi"));
	ppi.out_pa_callback().set(FUNC(pulsar_state::ppi_pa_w));
	ppi.out_pb_callback().set(FUNC(pulsar_state::ppi_pb_w));
	ppi.in_pc_callback().set(FUNC(pulsar_state::ppi_pc_r));
	ppi.out_pc_callback().set(FUNC(pulsar_state::ppi_pc_w));

	MSM5832(config, "rtc", 32.768_kHz_XTAL);

	z80dart_device& dart(Z80DART(config, "dart", 4_MHz_XTAL));
	dart.out_txda_callback().set("rs232", FUNC(rs232_port_device::write_txd));
	dart.out_dtra_callback().set("rs232", FUNC(rs232_port_device::write_dtr));
	dart.out_rtsa_callback().set("rs232", FUNC(rs232_port_device::write_rts));
	dart.out_int_callback().set_inputline(m_maincpu, INPUT_LINE_IRQ0);

	rs232_port_device &rs232(RS232_PORT(config, "rs232", default_rs232_devices, "terminal"));
	rs232.rxd_handler().set("dart", FUNC(z80dart_device::rxa_w));
	rs232.cts_handler().set("dart", FUNC(z80dart_device::ctsa_w));
	rs232.set_option_device_input_defaults("terminal", DEVICE_INPUT_DEFAULTS_NAME(terminal));

	com8116_device &brg(COM8116(config, "brg", 5.0688_MHz_XTAL));
	// Schematic has the labels for FT and FR the wrong way around, but the pin numbers are correct.
	brg.fr_handler().set("dart", FUNC(z80dart_device::txca_w));
	brg.fr_handler().append("dart", FUNC(z80dart_device::rxca_w));
	brg.ft_handler().set("dart", FUNC(z80dart_device::txcb_w));
	brg.ft_handler().append("dart", FUNC(z80dart_device::rxcb_w));

	FD1797(config, m_fdc, 4_MHz_XTAL / 2);
	FLOPPY_CONNECTOR(config, "fdc:0", pulsar_floppies, "flop", floppy_image_device::default_floppy_formats).enable_sound(true);
	FLOPPY_CONNECTOR(config, "fdc:1", pulsar_floppies, "flop", floppy_image_device::default_floppy_formats).enable_sound(true);
}

/* ROM definition */
ROM_START( pulsarlb )
	ROM_REGION( 0x10800, "maincpu", ROMREGION_ERASEFF )
	ROM_SYSTEM_BIOS(0, "mon7", "MP7A")
	ROMX_LOAD( "mp7a.u2", 0x10000, 0x800, CRC(726b8a19) SHA1(43b2af84d5622c1f67584c501b730acf002a6113), ROM_BIOS(0))
	ROM_SYSTEM_BIOS(1, "mon6", "LBOOT6") // Blank screen until floppy boots
	ROMX_LOAD( "lboot6.u2", 0x10000, 0x800, CRC(3bca9096) SHA1(ff99288e51a9e832785ce8e3ab5a9452b1064231), ROM_BIOS(1))
ROM_END

/* Driver */

//    YEAR  NAME      PARENT  COMPAT  MACHINE  INPUT   CLASS         INIT         COMPANY   FULLNAME            FLAGS
COMP( 1981, pulsarlb, 0,      0,      pulsar,  pulsar, pulsar_state, init_pulsar, "Pulsar", "Little Big Board", MACHINE_NO_SOUND_HW )