// license:BSD-3-Clause
// copyright-holders:Ryan Holtz
/****************************************************************************
drivers/4dpi.cpp
SGI Personal IRIS family skeleton driver
by Ryan Holtz
0x1fc00000 - 0x1fc3ffff ROM
Interrupts:
R2000:
NYI
Year Model Board CPU Clock I/D Cache
1988 4D/20 IP6 R2000 12.5MHz 16KiB/8KiB
4D/25 IP10 R3000 20MHz 64KiB/32KiB
4D/30 IP14 R3000 30MHz
1991 4D/35 IP12 R3000 36MHz
****************************************************************************/
#include "emu.h"
#include "cpu/mips/mips1.h"
#include "screen.h"
struct ip6_regs_t
{
uint16_t unknown_half_0;
uint8_t unknown_byte_0;
uint8_t unknown_byte_1;
};
class sgi_ip6_state : public driver_device
{
public:
sgi_ip6_state(const machine_config &mconfig, device_type type, const char *tag)
: driver_device(mconfig, type, tag) ,
m_maincpu(*this, "maincpu") { }
void sgi_ip6(machine_config &config);
void init_sgi_ip6();
private:
ip6_regs_t m_ip6_regs;
DECLARE_READ32_MEMBER(ip6_unk1_r);
DECLARE_WRITE32_MEMBER(ip6_unk1_w);
DECLARE_READ32_MEMBER(ip6_unk2_r);
DECLARE_WRITE32_MEMBER(ip6_unk2_w);
DECLARE_READ32_MEMBER(ip6_unk3_r);
DECLARE_WRITE32_MEMBER(ip6_unk3_w);
virtual void machine_start() override;
virtual void machine_reset() override;
virtual void video_start() override;
uint32_t screen_update_sgi_ip6(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
INTERRUPT_GEN_MEMBER(sgi_ip6_vbl);
inline void ATTR_PRINTF(3,4) verboselog( int n_level, const char *s_fmt, ... );
required_device<r2000_device> m_maincpu;
void sgi_ip6_map(address_map &map);
};
#define VERBOSE_LEVEL (0)
#define ENABLE_VERBOSE_LOG (1)
inline void ATTR_PRINTF(3,4) sgi_ip6_state::verboselog( int n_level, const char *s_fmt, ... )
{
#if ENABLE_VERBOSE_LOG
if( VERBOSE_LEVEL >= n_level )
{
va_list v;
char buf[ 32768 ];
va_start( v, s_fmt );
vsprintf( buf, s_fmt, v );
va_end( v );
logerror("%s: %s", machine().describe_context(), buf);
}
#endif
}
/***************************************************************************
VIDEO HARDWARE
***************************************************************************/
void sgi_ip6_state::video_start()
{
}
uint32_t sgi_ip6_state::screen_update_sgi_ip6(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
{
return 0;
}
/***************************************************************************
MACHINE FUNCTIONS
***************************************************************************/
READ32_MEMBER(sgi_ip6_state::ip6_unk1_r)
{
uint32_t ret = 0;
switch(offset)
{
case 0x0000/4:
if(ACCESSING_BITS_16_31)
{
verboselog(0, "ip6_unk1_r: Unknown address: %08x & %08x\n", 0x1f880000 + (offset << 2), mem_mask );
}
if(ACCESSING_BITS_0_15)
{
verboselog(0, "ip6_unk1_r: Unknown Halfword 0: %08x & %08x\n", m_ip6_regs.unknown_half_0, mem_mask );
ret |= m_ip6_regs.unknown_half_0;
}
break;
default:
verboselog(0, "ip6_unk1_r: Unknown address: %08x & %08x\n", 0x1f880000 + (offset << 2), mem_mask );
break;
}
return ret;
}
WRITE32_MEMBER(sgi_ip6_state::ip6_unk1_w)
{
switch(offset)
{
case 0x0000/4:
if(ACCESSING_BITS_16_31)
{
verboselog(0, "ip6_unk1_w: Unknown address: %08x = %08x & %08x\n", 0x1f880000 + (offset << 2), data, mem_mask );
}
if(ACCESSING_BITS_0_15)
{
verboselog(0, "ip6_unk1_w: Unknown Halfword 0 = %04x & %04x\n", data & 0x0000ffff, mem_mask & 0x0000ffff );
m_ip6_regs.unknown_half_0 = data & 0x0000ffff;
}
break;
default:
verboselog(0, "ip6_unk1_w: Unknown address: %08x = %08x & %08x\n", 0x1f880000 + (offset << 2), data, mem_mask );
break;
}
}
READ32_MEMBER(sgi_ip6_state::ip6_unk2_r)
{
uint32_t ret = 0;
switch(offset)
{
case 0x0000/4:
if(!ACCESSING_BITS_24_31)
{
verboselog(0, "ip6_unk2_r: Unknown address: %08x & %08x\n", 0x1f880000 + (offset << 2), mem_mask );
}
if(ACCESSING_BITS_24_31)
{
verboselog(0, "ip6_unk2_r: Unknown Byte 0 = %02x & %02x\n", m_ip6_regs.unknown_byte_0, mem_mask >> 24 );
ret |= m_ip6_regs.unknown_byte_0 << 24;
}
break;
default:
verboselog(0, "ip6_unk2_r: Unknown address: %08x & %08x\n", 0x1f880000 + (offset << 2), mem_mask );
break;
}
return ret;
}
WRITE32_MEMBER(sgi_ip6_state::ip6_unk2_w)
{
switch(offset)
{
case 0x0000/4:
if(!ACCESSING_BITS_24_31)
{
verboselog(0, "ip6_unk2_w: Unknown address: %08x = %08x & %08x\n", 0x1f880000 + (offset << 2), data, mem_mask );
}
if(ACCESSING_BITS_24_31)
{
verboselog(0, "ip6_unk2_w: Unknown Byte 0 = %02x & %02x\n", data >> 24, mem_mask >> 24 );
m_ip6_regs.unknown_byte_0 = (data & 0xff000000) >> 24;
}
break;
default:
verboselog(0, "ip6_unk2_w: Unknown address: %08x = %08x & %08x\n", 0x1f880000 + (offset << 2), data, mem_mask );
break;
}
}
READ32_MEMBER(sgi_ip6_state::ip6_unk3_r)
{
uint32_t ret = 0;
if(ACCESSING_BITS_16_23)
{
verboselog(0, "ip6_unk3_r: Unknown Byte 1: %02x & %02x\n", m_ip6_regs.unknown_byte_1, (mem_mask >> 16) & 0x000000ff);
ret |= m_ip6_regs.unknown_byte_1 << 16;
}
else
{
verboselog(0, "ip6_unk3_r: Unknown address: %08x & %08x\n", 0x1fb00000 + (offset << 2), mem_mask );
}
return ret;
}
WRITE32_MEMBER(sgi_ip6_state::ip6_unk3_w)
{
verboselog(0, "ip6_unk3_w: Unknown address: %08x = %08x & %08x\n", 0x1fb00000 + (offset << 2), data, mem_mask );
}
INTERRUPT_GEN_MEMBER(sgi_ip6_state::sgi_ip6_vbl)
{
}
void sgi_ip6_state::machine_start()
{
}
void sgi_ip6_state::machine_reset()
{
m_ip6_regs.unknown_byte_0 = 0x80;
m_ip6_regs.unknown_byte_1 = 0x80;
m_ip6_regs.unknown_half_0 = 0;
}
/***************************************************************************
ADDRESS MAPS
***************************************************************************/
void sgi_ip6_state::sgi_ip6_map(address_map &map)
{
map(0x1f880000, 0x1f880003).rw(FUNC(sgi_ip6_state::ip6_unk1_r), FUNC(sgi_ip6_state::ip6_unk1_w));
map(0x1fb00000, 0x1fb00003).rw(FUNC(sgi_ip6_state::ip6_unk3_r), FUNC(sgi_ip6_state::ip6_unk3_w));
map(0x1fbc004c, 0x1fbc004f).rw(FUNC(sgi_ip6_state::ip6_unk2_r), FUNC(sgi_ip6_state::ip6_unk2_w));
map(0x1fc00000, 0x1fc3ffff).rom().region("user1", 0);
}
/***************************************************************************
MACHINE DRIVERS
***************************************************************************/
MACHINE_CONFIG_START(sgi_ip6_state::sgi_ip6)
R2000(config, m_maincpu, 25_MHz_XTAL / 2, 16384, 8192);
m_maincpu->set_endianness(ENDIANNESS_BIG);
m_maincpu->set_addrmap(AS_PROGRAM, &sgi_ip6_state::sgi_ip6_map);
m_maincpu->set_vblank_int("screen", FUNC(sgi_ip6_state::sgi_ip6_vbl));
/* video hardware */
MCFG_SCREEN_ADD("screen", RASTER)
MCFG_SCREEN_REFRESH_RATE( 60 )
MCFG_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(2500)) /* not accurate */
MCFG_SCREEN_SIZE(640, 480)
MCFG_SCREEN_VISIBLE_AREA(0, 640-1, 0, 480-1)
MCFG_SCREEN_UPDATE_DRIVER(sgi_ip6_state, screen_update_sgi_ip6)
MACHINE_CONFIG_END
static INPUT_PORTS_START( sgi_ip6 )
PORT_START("UNUSED") // unused IN0
PORT_BIT(0xffff, IP_ACTIVE_HIGH, IPT_UNUSED)
INPUT_PORTS_END
void sgi_ip6_state::init_sgi_ip6()
{
}
/***************************************************************************
ROM definition(s)
***************************************************************************/
ROM_START( sgi_ip6 )
ROM_REGION32_BE( 0x40000, "user1", 0 )
ROM_LOAD( "4d202031.bin", 0x000000, 0x040000, CRC(065a290a) SHA1(6f5738e79643f94901e6efe3612468d14177f65b) )
ROM_END
// YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
COMP( 1988, sgi_ip6, 0, 0, sgi_ip6, sgi_ip6, sgi_ip6_state, init_sgi_ip6, "Silicon Graphics Inc", "4D/20", MACHINE_NOT_WORKING | MACHINE_NO_SOUND )