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

    Poisk-1 FDC device (model B504)

    Copyright MESS Team.
    Visit http://mamedev.org for licensing and usage restrictions.

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

#include "p1_fdc.h"

#include "cpu/i86/i86.h"
#include "formats/dsk_dsk.h"
#include "formats/pc_dsk.h"

#define VERBOSE_DBG 0

#define DBG_LOG(N,M,A) \
	do { \
		if(VERBOSE_DBG>=N) \
		{ \
			if( M ) \
				logerror("%11.6f: %-24s",machine().time().as_double(),(char*)M ); \
			logerror A; \
		} \
	} while (0)


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

const device_type P1_FDC = &device_creator<p1_fdc_device>;

static DECLARE_READ8_DEVICE_HANDLER(p1_FDC_r);
static DECLARE_WRITE8_DEVICE_HANDLER(p1_FDC_w);

FLOPPY_FORMATS_MEMBER( p1_fdc_device::floppy_formats )
	FLOPPY_PC_FORMAT,
	FLOPPY_DSK_FORMAT
FLOPPY_FORMATS_END

static SLOT_INTERFACE_START( poisk1_floppies )
	SLOT_INTERFACE( "525qd", FLOPPY_525_QD )
SLOT_INTERFACE_END

static MACHINE_CONFIG_FRAGMENT( fdc_b504 )
	MCFG_FD1793x_ADD("fdc", XTAL_16MHz / 16)
	MCFG_FLOPPY_DRIVE_ADD("fdc:0", poisk1_floppies, "525qd", p1_fdc_device::floppy_formats)
	MCFG_FLOPPY_DRIVE_ADD("fdc:1", poisk1_floppies, "525qd", p1_fdc_device::floppy_formats)
MACHINE_CONFIG_END

//-------------------------------------------------
//  ROM( p1_fdc )
//-------------------------------------------------

ROM_START( p1_fdc )
	ROM_REGION( 0x0800, "p1_fdc", 0 )
	ROM_DEFAULT_BIOS("a302")
	ROM_SYSTEM_BIOS(0, "normal", "B504 standard ROM")
	ROMX_LOAD( "b_ngmd_n.rf2", 0x00000, 0x0800, CRC(967e172a) SHA1(95117c40fd9f624fee08ccf37f615b16ff249688), ROM_BIOS(1))
	ROM_SYSTEM_BIOS(1, "a302", "v3.02") // Additional ROM BIOS v3.02 for DISKETTE service (c) Moscow 1991
	ROMX_LOAD( "b_ngmd_t.rf2", 0x00000, 0x0800, CRC(630010b1) SHA1(50876fe4f5f4f32a242faa70f9154574cd315ec4), ROM_BIOS(2))
	ROM_SYSTEM_BIOS(2, "ae304", "v3.04") // Additional enhanced ROM BIOS v3.04 for DISKETTE service (c) V.Rusakow Moscow 1992
	ROMX_LOAD( "p_fdd_nm.bin", 0x00000, 0x0800, CRC(0b7f867d) SHA1(9fe7e0ab2242e50394d1162cf1a619b6f2994bfb), ROM_BIOS(3))
	ROM_SYSTEM_BIOS(3, "ae308", "v3.08") // Additional enhanced ROM BIOS v3.08 for DISKETTE service (c) V.Rusakov Tarasovka 1992
	ROMX_LOAD( "p_fdd_my.bin", 0x00000, 0x0800, CRC(da5d0eaf) SHA1(b188ba856bd28e4964a88feb0b0b2ba7eb320efc), ROM_BIOS(4))
ROM_END


//-------------------------------------------------
//  machine_config_additions - device-specific
//  machine configurations
//-------------------------------------------------

machine_config_constructor p1_fdc_device::device_mconfig_additions() const
{
	return MACHINE_CONFIG_NAME( fdc_b504 );
}

//-------------------------------------------------
//  rom_region - device-specific ROM region
//-------------------------------------------------

const rom_entry *p1_fdc_device::device_rom_region() const
{
	return ROM_NAME( p1_fdc );
}


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

UINT8 p1_fdc_device::p1_wd17xx_motor_r()
{
	DBG_LOG(1,"p1_fdc_motor_r",("R = $%02x\n", 0));
	// XXX always on for now
	return 0;
}

UINT8 p1_fdc_device::p1_wd17xx_aux_r()
{
	cpu_device *maincpu = machine().device<cpu_device>("maincpu");

	if (!m_fdc->drq_r() && !m_fdc->intrq_r()) {
		// fake cpu wait by resetting PC one insn back
		maincpu->set_state_int(I8086_IP, maincpu->state_int(I8086_IP) - 2);
		maincpu->set_input_line(INPUT_LINE_HALT, ASSERT_LINE);
	}

	return m_fdc->drq_r();
}

/*
;       D0 - DRIVE SELECT 0
;       D1 - DRIVE SELECT 1
;       D2 - MOTOR ON 0
;       D3 - MOTOR ON 1
;       D4 - SIDE (HEAD) SELECT
;       D5 - DOUBLE DENSITY
;       D6 - FDC RESET
;       D7 - NO USE
*/
void p1_fdc_device::p1_wd17xx_aux_w(int data)
{
	DBG_LOG(1,"p1_fdc_aux_w",("W $%02x\n", data));

	floppy_image_device *floppy0 = m_fdc->subdevice<floppy_connector>("0")->get_device();
	floppy_image_device *floppy1 = m_fdc->subdevice<floppy_connector>("1")->get_device();
	floppy_image_device *floppy = ((data & 2)?floppy1:floppy0);

	if(!BIT(data, 6))
		m_fdc->reset();

	m_fdc->set_floppy(floppy);

	floppy->ss_w(BIT(data, 4));
	m_fdc->dden_w(BIT(data, 5));

	floppy0->mon_w(!(data & 4));
	floppy1->mon_w(!(data & 8));
}

void p1_fdc_device::p1_fdc_irq_drq(bool state)
{
	cpu_device *maincpu = machine().device<cpu_device>("maincpu");

	if(state)
		maincpu->set_input_line(INPUT_LINE_HALT, CLEAR_LINE);
}

static READ8_DEVICE_HANDLER( p1_FDC_r )
{
	UINT8 data = 0xff;
	p1_fdc_device *fdc  = downcast<p1_fdc_device *>(device);

	switch( offset )
	{
		case 0: data = fdc->p1_wd17xx_aux_r();     break;
		case 2: data = fdc->p1_wd17xx_motor_r();   break;
	}

	return data;
}

static WRITE8_DEVICE_HANDLER( p1_FDC_w )
{
	p1_fdc_device *fdc  = downcast<p1_fdc_device *>(device);

	switch( offset )
	{
		case 0: fdc->p1_wd17xx_aux_w(data);    break;
	}
}

//-------------------------------------------------
//  p1_fdc_device - constructor
//-------------------------------------------------

p1_fdc_device::p1_fdc_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
	device_t(mconfig, P1_FDC, "Poisk-1 floppy B504", tag, owner, clock, "p1_fdc", __FILE__),
	device_isa8_card_interface( mconfig, *this ),
	m_fdc(*this, "fdc")
{
}


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

void p1_fdc_device::device_start()
{
	set_isa_device();
	m_isa->install_rom(this, 0xe0000, 0xe07ff, 0, 0, "XXX", "p1_fdc");
	m_isa->install_device(0x00c0, 0x00c3, 0, 0,
		READ8_DEVICE_DELEGATE(m_fdc, fd1793_t, read),
		WRITE8_DEVICE_DELEGATE(m_fdc, fd1793_t, write) );
	m_isa->install_device(this, 0x00c4, 0x00c7, 0, 0, FUNC(p1_FDC_r), FUNC(p1_FDC_w) );
	m_fdc->setup_drq_cb(fd1793_t::line_cb(FUNC(p1_fdc_device::p1_fdc_irq_drq), this));
	m_fdc->setup_intrq_cb(fd1793_t::line_cb(FUNC(p1_fdc_device::p1_fdc_irq_drq), this));
}


//-------------------------------------------------
//  device_reset - device-specific reset
//-------------------------------------------------

void p1_fdc_device::device_reset()
{
}