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// license:BSD-3-Clause
// copyright-holders:Fabio Priuli
/***************************************************************************
Konami IC 033906 (PCI bridge)
***************************************************************************/
#include "emu.h"
#include "k033906.h"
#include "video/voodoo.h"
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
// device type definition
const device_type K033906 = &device_creator<k033906_device>;
//-------------------------------------------------
// k033906_device - constructor
//-------------------------------------------------
k033906_device::k033906_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock)
: device_t(mconfig, K033906, "K033906 PCI bridge", tag, owner, clock, "k033906", __FILE__)
{
}
//-------------------------------------------------
// device_start - device-specific startup
//-------------------------------------------------
void k033906_device::device_start()
{
m_voodoo = machine().device(m_voodoo_tag);
m_reg_set = 0;
save_item(NAME(m_reg));
save_item(NAME(m_ram));
save_item(NAME(m_reg_set));
}
WRITE_LINE_MEMBER(k033906_device::set_reg)
{
m_reg_set = state & 1;
}
UINT32 k033906_device::reg_r(int reg)
{
switch (reg)
{
case 0x00: return 0x0001121a; // PCI Vendor ID (0x121a = 3dfx), Device ID (0x0001 = Voodoo)
case 0x02: return 0x04000000; // Revision ID
case 0x04: return m_reg[0x04]; // memBaseAddr
case 0x0f: return m_reg[0x0f]; // interrupt_line, interrupt_pin, min_gnt, max_lat
default:
fatalerror("%s: k033906_reg_r: %08X\n", machine().describe_context(), reg);
}
// never executed
//return 0;
}
void k033906_device::reg_w(int reg, UINT32 data)
{
switch (reg)
{
case 0x00:
break;
case 0x01: // command register
break;
case 0x04: // memBaseAddr
{
if (data == 0xffffffff)
{
m_reg[0x04] = 0xff000000;
}
else
{
m_reg[0x04] = data & 0xff000000;
}
break;
}
case 0x0f: // interrupt_line, interrupt_pin, min_gnt, max_lat
{
m_reg[0x0f] = data;
break;
}
case 0x10: // initEnable
{
voodoo_set_init_enable(m_voodoo, data);
break;
}
case 0x11: // busSnoop0
case 0x12: // busSnoop1
break;
case 0x38: // ???
break;
default:
fatalerror("%s:K033906_w: %08X, %08X\n", machine().describe_context(), data, reg);
}
}
READ32_MEMBER(k033906_device::read)
{
if (m_reg_set)
return reg_r(offset);
else
return m_ram[offset];
}
WRITE32_MEMBER(k033906_device::write)
{
if (m_reg_set)
reg_w(offset, data);
else
m_ram[offset] = data;
}
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