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vp101: Implemented ATA DMA [R. Belmont]

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This commit is contained in:
arbee 2017-03-18 09:24:43 -04:00
parent cbee54fe1e
commit 93929213d0
1 changed files with 55 additions and 2 deletions
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57
src/mame/drivers/vp101.cpp
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@ -34,12 +34,21 @@ public:
m_ata(*this, "ata")
{ }
virtual void machine_reset() override;
virtual void machine_start() override;
DECLARE_READ32_MEMBER(tty_ready_r);
DECLARE_WRITE32_MEMBER(tty_w);
DECLARE_READ32_MEMBER(test_r) { return 0xffffffff; }
DECLARE_READ32_MEMBER(pic_r);
DECLARE_WRITE32_MEMBER(pic_w);
DECLARE_WRITE32_MEMBER(dmaaddr_w);
DECLARE_WRITE_LINE_MEMBER(dmarq_w);
uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
@ -54,8 +63,51 @@ protected:
virtual void video_start() override;
int pic_cmd;
int pic_state;
int m_dmarq_state;
uint32_t m_dma_ptr;
};
void vp10x_state::machine_reset()
{
m_dmarq_state = 0;
pic_cmd = pic_state = 0;
}
void vp10x_state::machine_start()
{
m_maincpu->mips3drc_set_options(MIPS3DRC_FASTEST_OPTIONS);
m_maincpu->add_fastram(0x00000000, 0x07ffffff, false, m_mainram);
}
WRITE32_MEMBER(vp10x_state::dmaaddr_w)
{
m_dma_ptr = (data & 0x07ffffff);
}
WRITE_LINE_MEMBER(vp10x_state::dmarq_w)
{
if (state != m_dmarq_state)
{
m_dmarq_state = state;
if (state)
{
uint16_t *RAMbase = (uint16_t *)&m_mainram[0];
uint16_t *RAM = &RAMbase[m_dma_ptr>>1];
m_ata->write_dmack(ASSERT_LINE);
while (m_dmarq_state)
{
*RAM++ = m_ata->read_dma();
m_dma_ptr += 2; // pointer must advance
}
m_ata->write_dmack(CLEAR_LINE);
}
}
}
READ32_MEMBER(vp10x_state::pic_r)
{
static const uint8_t vers[5] = { 0x00, 0x01, 0x00, 0x00, 0x00 };
@ -92,7 +144,6 @@ WRITE32_MEMBER(vp10x_state::pic_w)
void vp10x_state::video_start()
{
pic_cmd = pic_state = 0;
}
uint32_t vp10x_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
@ -127,7 +178,7 @@ WRITE32_MEMBER(vp10x_state::tty_w) // set breakpoint at bfc01430 to catch when
{
// uncomment to see startup messages - it says "RAM OK" and "EPI RSS Ver 4.5.1" followed by "<RSS active>" and then lots of dots
// Special Forces also says "<inited tv_cap> = 00000032"
// printf("%c", data);
printf("%c", data);
}
static ADDRESS_MAP_START( main_map, AS_PROGRAM, 32, vp10x_state )
@ -140,6 +191,7 @@ static ADDRESS_MAP_START( main_map, AS_PROGRAM, 32, vp10x_state )
AM_RANGE(0x1ca0000c, 0x1ca0000f) AM_READ_PORT("IN0")
AM_RANGE(0x1ca00010, 0x1ca00013) AM_READ(test_r) // bits here cause various test mode stuff
AM_RANGE(0x1cf00000, 0x1cf00003) AM_NOP AM_READNOP
AM_RANGE(0x1d000030, 0x1d000033) AM_WRITE(dmaaddr_w) // ATA DMA destination address
AM_RANGE(0x1d000040, 0x1d00005f) AM_DEVREADWRITE16("ata", ata_interface_device, read_cs0, write_cs0, 0x0000ffff)
AM_RANGE(0x1d000060, 0x1d00007f) AM_DEVREADWRITE16("ata", ata_interface_device, read_cs1, write_cs1, 0x0000ffff)
AM_RANGE(0x1f200000, 0x1f200003) AM_READWRITE(pic_r, pic_w)
@ -173,6 +225,7 @@ static MACHINE_CONFIG_START( vp101, vp10x_state )
MCFG_SCREEN_VISIBLE_AREA(0, 319, 0, 239)
MCFG_ATA_INTERFACE_ADD("ata", ata_devices, "hdd", nullptr, false)
MCFG_ATA_INTERFACE_DMARQ_HANDLER(WRITELINE(vp10x_state, dmarq_w))
MCFG_NVRAM_ADD_0FILL("nvram")
MACHINE_CONFIG_END