diff options
Diffstat (limited to 'src/emu/bus/snes/sfx.c')
-rw-r--r-- | src/emu/bus/snes/sfx.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/emu/bus/snes/sfx.c b/src/emu/bus/snes/sfx.c new file mode 100644 index 00000000000..75c2827a5a6 --- /dev/null +++ b/src/emu/bus/snes/sfx.c @@ -0,0 +1,149 @@ +/*********************************************************************************************************** + + SuperFX add-on chip emulation (for SNES/SFC) + + Copyright MESS Team. + Visit http://mamedev.org for licensing and usage restrictions. + + ***********************************************************************************************************/ + + +#include "emu.h" +#include "sfx.h" +#include "cpu/g65816/g65816.h" + +//------------------------------------------------- +// sns_rom_superfx_device - constructor +//------------------------------------------------- + +const device_type SNS_LOROM_SUPERFX = &device_creator<sns_rom_superfx_device>; + + +sns_rom_superfx_device::sns_rom_superfx_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) + : sns_rom_device(mconfig, SNS_LOROM_SUPERFX, "SNES Cart (LoROM) + SuperFX", tag, owner, clock, "sns_rom_superfx", __FILE__), + m_superfx(*this, "superfx") +{ +} + +void sns_rom_superfx_device::device_start() +{ + save_item(NAME(sfx_ram)); +} + +void sns_rom_superfx_device::device_reset() +{ + memset(sfx_ram, 0x00, sizeof(sfx_ram)); +} + +/*------------------------------------------------- + mapper specific handlers + -------------------------------------------------*/ + +// LoROM + SuperFX (GSU-1,2) +// TODO: mask sfx_ram based on the actual RAM... + +READ8_MEMBER( sns_rom_superfx_device::superfx_r_bank1 ) +{ + return m_rom[rom_bank_map[offset / 0x10000] * 0x8000 + (offset & 0x7fff)]; +} + +READ8_MEMBER( sns_rom_superfx_device::superfx_r_bank2 ) +{ + return m_rom[rom_bank_map[offset / 0x8000] * 0x8000 + (offset & 0x7fff)]; +} + +READ8_MEMBER( sns_rom_superfx_device::superfx_r_bank3 ) +{ + return sfx_ram[offset & 0xfffff]; +} + +WRITE8_MEMBER( sns_rom_superfx_device::superfx_w_bank1 ) +{ +} + +WRITE8_MEMBER( sns_rom_superfx_device::superfx_w_bank2 ) +{ +} + +WRITE8_MEMBER( sns_rom_superfx_device::superfx_w_bank3 ) +{ + sfx_ram[offset & 0xfffff] = data; +} + +static ADDRESS_MAP_START( sfx_map, AS_PROGRAM, 8, sns_rom_superfx_device ) + AM_RANGE(0x000000, 0x3fffff) AM_READWRITE(superfx_r_bank1, superfx_w_bank1) + AM_RANGE(0x400000, 0x5fffff) AM_READWRITE(superfx_r_bank2, superfx_w_bank2) + AM_RANGE(0x600000, 0x7dffff) AM_READWRITE(superfx_r_bank3, superfx_w_bank3) + AM_RANGE(0x800000, 0xbfffff) AM_READWRITE(superfx_r_bank1, superfx_w_bank1) + AM_RANGE(0xc00000, 0xdfffff) AM_READWRITE(superfx_r_bank2, superfx_w_bank2) + AM_RANGE(0xe00000, 0xffffff) AM_READWRITE(superfx_r_bank3, superfx_w_bank3) +ADDRESS_MAP_END + + +WRITE_LINE_MEMBER(sns_rom_superfx_device::snes_extern_irq_w) +{ + machine().device("maincpu")->execute().set_input_line(G65816_LINE_IRQ, state); +} + + +static MACHINE_CONFIG_FRAGMENT( snes_sfx ) + MCFG_CPU_ADD("superfx", SUPERFX, 21480000) /* 21.48MHz */ + MCFG_CPU_PROGRAM_MAP(sfx_map) + MCFG_SUPERFX_OUT_IRQ(WRITELINE(sns_rom_superfx_device, snes_extern_irq_w)) /* IRQ line from cart */ +MACHINE_CONFIG_END + +machine_config_constructor sns_rom_superfx_device::device_mconfig_additions() const +{ + return MACHINE_CONFIG_NAME( snes_sfx ); +} + +READ8_MEMBER( sns_rom_superfx_device::chip_read ) +{ + return m_superfx->mmio_read(offset); +} + +WRITE8_MEMBER( sns_rom_superfx_device::chip_write ) +{ + m_superfx->mmio_write(offset, data); +} + + +READ8_MEMBER( sns_rom_superfx_device::read_l ) +{ + return read_h(space, offset); +} + +READ8_MEMBER(sns_rom_superfx_device::read_h) +{ + if (offset < 0x400000) + return m_rom[rom_bank_map[offset / 0x10000] * 0x8000 + (offset & 0x7fff)]; + else if (offset < 0x600000) + { + if (m_superfx->access_rom()) + { + return m_rom[rom_bank_map[(offset - 0x400000) / 0x8000] * 0x8000 + (offset & 0x7fff)]; + } + else + { + static const UINT8 sfx_data[16] = { + 0x00, 0x01, 0x00, 0x01, 0x04, 0x01, 0x00, 0x01, + 0x00, 0x01, 0x08, 0x01, 0x00, 0x01, 0x0c, 0x01, + }; + return sfx_data[offset & 0x0f]; + } + } + return 0xff; // this handler should never be called for [60-7f]/[e0-ff] ranges +} + +READ8_MEMBER( sns_rom_superfx_device::read_ram ) +{ + if (m_superfx->access_ram()) + return sfx_ram[offset & 0xfffff]; + return 0xff; // should be open bus... +} + +WRITE8_MEMBER( sns_rom_superfx_device::write_ram ) +{ + if (m_superfx->access_ram()) + sfx_ram[offset & 0xfffff] = data; +} |