// license:BSD-3-Clause
// copyright-holders:R. Belmont
/***************************************************************************

  Brigent BootBug card

  Debugger support card for creators of NuBus slot firmware and other
  early-boot/low-level software.

  Basically a serial card with an overachieving declaration ROM.

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

#include "emu.h"
#include "bootbug.h"
#include "bus/rs232/rs232.h"
#include "bus/rs232/terminal.h"
#include "bus/rs232/null_modem.h"
#include "screen.h"

static SLOT_INTERFACE_START(isa_com)
		SLOT_INTERFACE("terminal", SERIAL_TERMINAL)
		SLOT_INTERFACE("null_modem", NULL_MODEM)
SLOT_INTERFACE_END

#define BOOTBUG_ROM_REGION  "btbug_rom"

ROM_START( bootbug )
	ROM_REGION(0x10000, BOOTBUG_ROM_REGION, 0)
	ROM_DEFAULT_BIOS("bb15")
	ROM_SYSTEM_BIOS(0, "bb15", "BootBug v1.5")
	ROMX_LOAD( "bootbug1.5.bin", 0x000000, 0x010000, CRC(432badf0) SHA1(914ad4bb28946cac732cf8b178508b69e4c1aae2), ROM_BIOS(1))
	ROM_SYSTEM_BIOS(1, "bb13", "BootBug v1.3")
	ROMX_LOAD( "bootbug1.3.bin", 0x000000, 0x010000, CRC(2902a234) SHA1(c783d19a5e4c536e58e1e7e201ec47e8fb78d435), ROM_BIOS(2))
ROM_END

//**************************************************************************
//  GLOBAL VARIABLES
//**************************************************************************

DEFINE_DEVICE_TYPE(NUBUS_BOOTBUG, nubus_bootbug_device, "nb_btbug", "Brigent BootBug debugger card")


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

MACHINE_CONFIG_START(nubus_bootbug_device::device_add_mconfig)
	MCFG_DEVICE_ADD( "uart_0", NS16450, XTAL(1'843'200) )
	MCFG_INS8250_OUT_TX_CB(DEVWRITELINE("serport0", rs232_port_device, write_txd))
	MCFG_INS8250_OUT_DTR_CB(DEVWRITELINE("serport0", rs232_port_device, write_dtr))
	MCFG_INS8250_OUT_RTS_CB(DEVWRITELINE("serport0", rs232_port_device, write_rts))

	MCFG_RS232_PORT_ADD( "serport0", isa_com, "terminal" )
	MCFG_RS232_RXD_HANDLER(DEVWRITELINE("uart_0", ins8250_uart_device, rx_w))
	MCFG_RS232_DCD_HANDLER(DEVWRITELINE("uart_0", ins8250_uart_device, dcd_w))
	MCFG_RS232_DSR_HANDLER(DEVWRITELINE("uart_0", ins8250_uart_device, dsr_w))
	MCFG_RS232_RI_HANDLER(DEVWRITELINE("uart_0", ins8250_uart_device, ri_w))
	MCFG_RS232_CTS_HANDLER(DEVWRITELINE("uart_0", ins8250_uart_device, cts_w))
MACHINE_CONFIG_END

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

const tiny_rom_entry *nubus_bootbug_device::device_rom_region() const
{
	return ROM_NAME( bootbug );
}

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

//-------------------------------------------------
//  nubus_bootbug_device - constructor
//-------------------------------------------------

nubus_bootbug_device::nubus_bootbug_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
	nubus_bootbug_device(mconfig, NUBUS_BOOTBUG, tag, owner, clock)
{
}

nubus_bootbug_device::nubus_bootbug_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_nubus_card_interface(mconfig, *this),
	m_uart(*this, "uart_0")
{
}

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

void nubus_bootbug_device::device_start()
{
	uint32_t slotspace;

	// set_nubus_device makes m_slot valid
	set_nubus_device();
	install_declaration_rom(this, BOOTBUG_ROM_REGION);

	slotspace = get_slotspace();

	m_nubus->install_device(slotspace, slotspace+0xff, read32_delegate(FUNC(nubus_bootbug_device::dev_r), this), write32_delegate(FUNC(nubus_bootbug_device::dev_w), this));
}

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

void nubus_bootbug_device::device_reset()
{
}

WRITE32_MEMBER( nubus_bootbug_device::dev_w )
{
	m_uart->ins8250_w(space, offset, data & 0xff);
}

READ32_MEMBER( nubus_bootbug_device::dev_r )
{
	return m_uart->ins8250_r(space, offset);
}
