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-rw-r--r--src/devices/bus/snes/sfx.c148
1 files changed, 148 insertions, 0 deletions
diff --git a/src/devices/bus/snes/sfx.c b/src/devices/bus/snes/sfx.c
new file mode 100644
index 00000000000..9fce31d00db
--- /dev/null
+++ b/src/devices/bus/snes/sfx.c
@@ -0,0 +1,148 @@
+// license:BSD-3-Clause
+// copyright-holders:Fabio Priuli
+/***********************************************************************************************************
+
+ SuperFX add-on chip emulation (for SNES/SFC)
+
+ ***********************************************************************************************************/
+
+
+#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;
+}