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// license:BSD-3-Clause
// copyright-holders:Olivier Galibert
#include "emu.h"
#include "naomim2.h"
/********************************************************************************************************
Naomi cartridge type M2/3 mapping
---------------------------------
NAOMI_ROM_OFFSET bit29: ROM size/mapping selection, 0 - 4MB ROM mode, 1 - 8MB ROM mode
bit28: master/slave ROM board select.
flash-based 171-7885A ROM board JP4 select master (access at 0xxxxxxx) or slave (access at 1xxxxxxx) mode.
then set to slave it can be stacked with another type M2/3 ROM board.
this bit selects which one ROM board will be accessed.
note: if ROM is not mounted its area readed as 0xFF
8MB ROM mode:
+---------+----------------------------------------------------------------------------------------------+
| | Cart PCB type |
| Address +-------------------+----------------------+---------------------------------------------------+
| | 171-7919A | 171-8132B | NAMCO |
+---------+-------------------+----------------------+---------------------------------------------------+
|00000000 | ROM0 IC22*1(4MB) | IC22(ROM0)*1 (4MB) | 2F FL0 (8MB) |
|00400000 | FF filled (4MB) | FF filled (4MB) | |
|00800000 | ROM1 IC1 (8MB) | IC1 (16MB) | 2D FL1 (8MB) |
|01000000 | ROM2 IC2 (8MB) | | 2C FL2 (8MB) \ or 4N MA1 (16MB) |
|01800000 | ROM3 IC3 (8MB) | IC2 (16MB) | 2B FL3 (8MB) / |
|02000000 | ROM4 IC4 (8MB) | | 4M MA2 (16MB) |
|02800000 | ROM5 IC5 (8MB) | IC3 (16MB) | |
|03000000 | ROM6 IC6 (8MB) | | 4L MA3 (16MB) |
|03800000 | ROM7 IC7 (8MB) | IC4 (16MB) | |
|04000000 | ROM8 IC8 (8MB) | | 4K MA4 (16MB) |
|04800000 | ROM9 IC9 (8MB) | IC5 (16MB) | |
|05000000 | ROM10 IC10 (8MB) | | 4J MA5 (16MB) |
|05800000 | ROM11 IC11 (8MB) | IC6 (16MB) | |
|06000000 | ROM12 IC12S (8MB) | | 4H MA6 (16MB) |
|06800000 | ROM13 IC13S (8MB) | IC7 (16MB) | |
|07000000 | ROM14 IC14S (8MB) | | 4F MA7 (16MB) |
|07800000 | ROM15 IC15S (8MB) | IC8 (16MB) | |
|08000000 | ROM16 IC16S (8MB) | | 4E MA8 (16MB) |
|08800000 | ROM17 IC17S (8MB) | IC9 (16MB) | |
|09000000 | ROM18 IC18S (8MB) | | 4D MA9 (16MB) |
|09800000 | ROM19 IC19S (8MB) | IC10 (16MB) | |
|0A000000 | ROM20 IC20S (8MB) | | 4C MA10 (16MB) |
|0A800000 | ROM21 IC21S (8MB) | IC11 (16MB) | |
|0B000000 | FF filled area | FF filled area | 4B MA11 (16MB) |
|0C000000 | | | 6P MA12 (16MB) |
|0D000000 | | | 6N MA13 (16MB) |
|0E000000 | | | 6M MA14 (16MB) |
|0F000000 | | | 6L MA15 (16MB) |
|10000000 | Slave ROM board | Slave ROM board | 6K MA16 (16MB) |
|11000000 | area | area | 6J MA17 (16MB) |
|12000000 | | | 6H MA18 (16MB) |
|13000000 | | | 6F MA19 (16MB) |
|14000000 | | | 6E MA20 (16MB) |
|15000000 | | | 6D MA21 (16MB) |
|16000000 | | | 6C MA22 (16MB) |
|17000000 | | | 6B MA23 (16MB) |
+---------+-------------------+----------------------+---------------------------------------------------+
*1 in the case 2MB IC22 it will be mirrored
4MB ROM mode:
+---------+----------------------------------------------------------------------------------------------+
| | Cart PCB type |
| Address +-------------------+---------------------+----------------------------------------------------+
| | 171-7919A | 171-8132B | NAMCO |
+---------+-------------------+---------------------+----------------------------------------------------+
|00000000 | ROM0 IC22 (4MB) | IC22(ROM0) (4MB) | 2F FL0 (4MB) |
|00400000 | ROM1 IC1 (4MB) | IC1 (4MB) | 2D FL1 (4MB) |
|00800000 | ROM2 IC2 (4MB) | IC1 2nd half (4MB) | 2C FL2 (4MB) or 4N MA1 (4MB) |
|00C00000 | ROM3 IC3 (4MB) | IC2 (4MB) | 2B FL3 (4MB) or 4N MA1 2nd half (4MB) |
|01000000 | ROM4 IC4 (4MB) | IC2 2nd half (4MB) | 4M MA2 (4MB) |
|01400000 | ROM5 IC5 (4MB) | IC3 (4MB) | 4M MA2 2nd half (4MB) |
|01800000 | ROM6 IC6 (4MB) | IC3 2nd half (4MB) | 4L MA3 (4MB) |
|01C00000 | ROM7 IC7 (4MB) | IC4 (4MB) | 4L MA3 2nd half (4MB) |
|02000000 | ROM8 IC8 (4MB) | IC4 2nd half (4MB) | 4K MA4 (4MB) |
|02400000 | ROM9 IC9 (4MB) | IC5 (4MB) | 4K MA4 2nd half (4MB) |
|02800000 | ROM10 IC10 (4MB) | IC5 2nd half (4MB) | 4J MA5 (4MB) |
|02C00000 | ROM11 IC11 (4MB) | IC6 (4MB) | 4J MA5 2nd half (4MB) |
|03000000 | ROM12 IC12S (4MB) | IC6 2nd half (4MB) | 4H MA6 (4MB) |
|03400000 | ROM13 IC13S (4MB) | IC7 (4MB) | 4H MA6 2nd half (4MB) |
|03800000 | ROM14 IC14S (4MB) | IC7 2nd half (4MB) | 4F MA7 (4MB) |
|03C00000 | ROM15 IC15S (4MB) | IC8 (4MB) | 4F MA7 2nd half (4MB) |
|04000000 | ROM16 IC16S (4MB) | IC8 2nd half (4MB) | 4E MA8 (4MB) |
|04400000 | ROM17 IC17S (4MB) | IC9 (4MB) | 4E MA8 2nd half (4MB) |
|04800000 | ROM18 IC18S (4MB) | IC9 2nd half (4MB) | 4D MA9 (4MB) |
|04C00000 | ROM19 IC19S (4MB) | IC10 (4MB) | 4D MA9 2nd half (4MB) |
|05000000 | ROM20 IC20S (4MB) | IC10 2nd half (4MB) | 4C MA10 (4MB) |
|05400000 | ROM21 IC21S (4MB) | IC11 (4MB) | 4C MA10 2nd half (4MB) |
|05800000 | FF filled area | FF filled area | 4B MA11 (4MB) |
|05C00000 | | | 4B MA11 2nd half (4MB) |
|06000000 | | | 6P MA12 (4MB) |
|06400000 | | | 6P MA12 2nd half (4MB) |
|06800000 | | | 6N MA13 (4MB) |
|06C00000 | | | 6N MA13 2nd half (4MB) |
|07000000 | | | 6M MA14 (4MB) |
|07400000 | | | 6M MA14 2nd half (4MB) |
|07800000 | | | 6L MA15 (4MB) |
|07C00000 | | | 6L MA15 2nd half (4MB) |
+---------+-------------------+---------------------+----------------------------------------------------+
|08000000 | mirror (128MB) | mirror (128MB) | mirror (128MB) |
+---------+-------------------+---------------------+----------------------------------------------------+
|10000000 | slave ROM board | slave ROM board | FF filled (256MB) (or MA16-23 in 4MB mode?) |
+---------+-------------------+---------------------+----------------------------------------------------+
********************************************************************************************************/
DEFINE_DEVICE_TYPE(NAOMI_M2_BOARD, naomi_m2_board, "naomi_m2_board", "Sega NAOMI M2 Board")
naomi_m2_board::naomi_m2_board(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: naomi_board(mconfig, NAOMI_M2_BOARD, tag, owner, clock)
, m_cryptdevice(*this, "segam2crypt")
, m_region(*this, DEVICE_SELF)
{
}
void naomi_m2_board::device_start()
{
naomi_board::device_start();
ram = std::make_unique<uint8_t[]>(RAM_SIZE);
save_item(NAME(rom_cur_address));
save_pointer(NAME(ram), RAM_SIZE);
}
void naomi_m2_board::device_reset()
{
naomi_board::device_reset();
memset(ram.get(), 0, RAM_SIZE);
rom_cur_address = 0;
}
void naomi_m2_board::board_setup_address(uint32_t address, bool is_dma)
{
rom_cur_address = address;
}
void naomi_m2_board::board_get_buffer(uint8_t *&base, uint32_t &limit)
{
if(rom_cur_address & 0x40000000) {
if(rom_cur_address == 0x4001fffe) {
m_cryptdevice->do_decrypt(base);
limit = 2;
} else
throw emu_fatalerror("NAOMIM2: Unsupported, read from %08x", rom_cur_address);
} else {
if (rom_offset & 0x20000000) {
base = m_region->base() + (rom_cur_address & 0x1fffffff);
limit = m_region->bytes() - (rom_cur_address & 0x1fffffff);
} else {
uint32_t offset4mb = (rom_cur_address & 0x103FFFFF) | ((rom_cur_address & 0x07C00000) << 1);
base = m_region->base() + offset4mb;
limit = std::min(m_region->bytes() - offset4mb, 0x00400000 - (offset4mb & 0x003FFFFF));
}
}
}
void naomi_m2_board::board_advance(uint32_t size)
{
rom_cur_address += size;
}
void naomi_m2_board::board_write(offs_t offset, uint16_t data)
{
if(offset & 0x40000000) {
if(offset & 0x00020000) {
offset &= RAM_SIZE-1;
ram[offset] = data;
ram[offset+1] = data >> 8;
return;
}
switch(offset & 0x1ffff) {
case 0x1fff8: m_cryptdevice->set_addr_low(data); return;
case 0x1fffa: m_cryptdevice->set_addr_high(data); return;
case 0x1fffc: m_cryptdevice->set_subkey(data); return;
}
}
logerror("NAOMIM2: unhandled board write %08x, %04x\n", offset, data);
}
uint16_t naomi_m2_board::read_callback(uint32_t addr)
{
if ((addr & 0xffff0000) == 0x01000000) {
int base = 2*(addr & 0x7fff);
return ram[base+1] | (ram[base] << 8);
}
else {
const uint8_t *base = &m_region->as_u8(2*addr);
return base[1] | (base[0] << 8);
}
}
void naomi_m2_board::device_add_mconfig(machine_config &config)
{
SEGA315_5881_CRYPT(config, m_cryptdevice, 0);
m_cryptdevice->set_read_cb(FUNC(naomi_m2_board::read_callback));
}
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