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// license:BSD-3-Clause
// copyright-holders:Nigel Barnes
/**********************************************************************

    Watford Electronics DDB FDC

    DDB : 1770
    DDB2: 1772
    DDB3: 1770 (Acorn compatible)

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


#include "emu.h"
#include "watford.h"


//**************************************************************************
//  DEVICE DEFINITIONS
//**************************************************************************

DEFINE_DEVICE_TYPE(BBC_WEDDB2, bbc_weddb2_device, "bbc_weddb2", "Watford Electronics DDB2 1772 FDC")
DEFINE_DEVICE_TYPE(BBC_WEDDB3, bbc_weddb3_device, "bbc_weddb3", "Watford Electronics DDB3 1770 FDC")


//-------------------------------------------------
//  FLOPPY_FORMATS( floppy_formats )
//-------------------------------------------------

void bbc_watfordfdc_device::floppy_formats(format_registration &fr)
{
	fr.add_mfm_containers();
	fr.add(FLOPPY_ACORN_SSD_FORMAT);
	fr.add(FLOPPY_ACORN_DSD_FORMAT);
	fr.add(FLOPPY_FSD_FORMAT);
}

static void bbc_floppies_525(device_slot_interface &device)
{
	device.option_add("525sssd", FLOPPY_525_SSSD);
	device.option_add("525sd",   FLOPPY_525_SD);
	device.option_add("525ssdd", FLOPPY_525_SSDD);
	device.option_add("525dd",   FLOPPY_525_DD);
	device.option_add("525qd",   FLOPPY_525_QD);
}

//-------------------------------------------------
//  ROM( watford )
//-------------------------------------------------

ROM_START( weddb2 )
	ROM_REGION(0x4000, "dfs_rom", 0)
	ROM_DEFAULT_BIOS("ddfs153")
	ROM_SYSTEM_BIOS(0, "ddfs140", "Watford Electronics DDFS 1.40")
	ROMX_LOAD("ddfs140.rom", 0x0000, 0x4000, CRC(6c6eef94) SHA1(d86b26a6fe7b3532e7bd3c6f3e8e503edac3811c), ROM_BIOS(0))
	ROM_SYSTEM_BIOS(1, "ddfs150", "Watford Electronics DDFS 1.50")
	ROMX_LOAD("ddfs150.rom", 0x0000, 0x4000, CRC(d2fff497) SHA1(7693f14aeed26c34b2342c3487ed4b9ad233e279), ROM_BIOS(1))
	ROM_SYSTEM_BIOS(2, "ddfs153", "Watford Electronics DDFS 1.53")
	ROMX_LOAD("ddfs153.rom", 0x0000, 0x4000, CRC(e1be4ee4) SHA1(6719dc958f2631e6dc8f045429797b289bfe649a), ROM_BIOS(2))
ROM_END

ROM_START( weddb3 )
	ROM_REGION(0x4000, "dfs_rom", 0)
	ROM_DEFAULT_BIOS("ddfs154t")
	ROM_SYSTEM_BIOS(0, "ddfs154t", "Watford Electronics DDFS 1.54T")
	ROMX_LOAD("ddfs154t.rom", 0x0000, 0x4000, CRC(6504c1ed) SHA1(618b7a1551f91e2b18608428b9e581f3d920d4b5), ROM_BIOS(0))
ROM_END


//-------------------------------------------------
//  device_add_mconfig - add device configuration
//-------------------------------------------------

void bbc_weddb2_device::device_add_mconfig(machine_config &config)
{
	WD1772(config, m_fdc, 8_MHz_XTAL);
	m_fdc->intrq_wr_callback().set(DEVICE_SELF_OWNER, FUNC(bbc_fdc_slot_device::intrq_w));
	m_fdc->drq_wr_callback().set(DEVICE_SELF_OWNER, FUNC(bbc_fdc_slot_device::drq_w));

	FLOPPY_CONNECTOR(config, m_floppy[0], bbc_floppies_525, "525qd", floppy_formats).enable_sound(true);
	FLOPPY_CONNECTOR(config, m_floppy[1], bbc_floppies_525, "525qd", floppy_formats).enable_sound(true);
}

void bbc_weddb3_device::device_add_mconfig(machine_config &config)
{
	WD1770(config, m_fdc, DERIVED_CLOCK(1, 1));
	m_fdc->intrq_wr_callback().set(DEVICE_SELF_OWNER, FUNC(bbc_fdc_slot_device::intrq_w));
	m_fdc->drq_wr_callback().set(DEVICE_SELF_OWNER, FUNC(bbc_fdc_slot_device::drq_w));

	FLOPPY_CONNECTOR(config, m_floppy[0], bbc_floppies_525, "525qd", floppy_formats).enable_sound(true);
	FLOPPY_CONNECTOR(config, m_floppy[1], bbc_floppies_525, "525qd", floppy_formats).enable_sound(true);
}

const tiny_rom_entry *bbc_weddb2_device::device_rom_region() const
{
	return ROM_NAME( weddb2 );
}

const tiny_rom_entry *bbc_weddb3_device::device_rom_region() const
{
	return ROM_NAME( weddb3 );
}


//**************************************************************************
//  LIVE DEVICE
//**************************************************************************

//-------------------------------------------------
//  bbc_watfordfdc_device - constructor
//-------------------------------------------------

bbc_watfordfdc_device::bbc_watfordfdc_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, const XTAL &clock)
	: device_t(mconfig, type, tag, owner, clock)
	, device_bbc_fdc_interface(mconfig, *this)
{
}

bbc_weddb2_device::bbc_weddb2_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
	: bbc_watfordfdc_device(mconfig, BBC_WEDDB2, tag, owner, clock)
	, m_fdc(*this, "wd1772")
	, m_floppy(*this, "wd1772:%u", 0)
	, m_drive_control(0)
{
}

bbc_weddb3_device::bbc_weddb3_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
	: bbc_watfordfdc_device(mconfig, BBC_WEDDB3, tag, owner, clock)
	, m_fdc(*this, "wd1770")
	, m_floppy(*this, "wd1770:%u", 0)
	, m_drive_control(0)
{
}

//-------------------------------------------------
//  device_start - device-specific startup
//-------------------------------------------------

void bbc_weddb2_device::device_start()
{
	save_item(NAME(m_drive_control));
}

void bbc_weddb3_device::device_start()
{
	save_item(NAME(m_drive_control));
}


//**************************************************************************
//  IMPLEMENTATION
//**************************************************************************

uint8_t bbc_weddb2_device::read(offs_t offset)
{
	uint8_t data;

	if (offset & 0x04)
	{
		data = m_fdc->read(offset & 0x03);
	}
	else
	{
		data = m_drive_control;
	}
	return data;
}

void bbc_weddb2_device::write(offs_t offset, uint8_t data)
{
	if (offset & 0x04)
	{
		m_fdc->write(offset & 0x03, data);
	}
	else
	{
		floppy_image_device *floppy = nullptr;

		m_drive_control = data;

		// bit 2: drive select
		floppy_image_device *floppy0 = m_floppy[0]->get_device();
		floppy_image_device *floppy1 = m_floppy[1]->get_device();
		floppy = (BIT(data, 2) ? floppy1 : floppy0);
		m_fdc->set_floppy(floppy);

		// bit 0: density
		m_fdc->dden_w(BIT(data, 0));

		// bit 1: side select
		if (floppy)
			floppy->ss_w(BIT(data, 1));

		// bit 3: reset
		m_fdc->mr_w(BIT(data, 3));
	}
}

uint8_t bbc_weddb3_device::read(offs_t offset)
{
	uint8_t data;

	if (offset & 0x04)
	{
		data = m_fdc->read(offset & 0x03);
	}
	else
	{
		data = m_drive_control;
	}
	return data;
}

void bbc_weddb3_device::write(offs_t offset, uint8_t data)
{
	if (offset & 0x04)
	{
		m_fdc->write(offset & 0x03, data);
	}
	else
	{
		floppy_image_device *floppy = nullptr;

		m_drive_control = data;

		// bit 0, 1: drive select
		if (BIT(data, 0)) floppy = m_floppy[0]->get_device();
		if (BIT(data, 1)) floppy = m_floppy[1]->get_device();
		m_fdc->set_floppy(floppy);

		// bit 2: side select
		if (floppy)
			floppy->ss_w(BIT(data, 2));

		// bit 3: density
		m_fdc->dden_w(BIT(data, 3));

		// bit 5: reset
		m_fdc->mr_w(BIT(data, 5));
	}
}