// license:BSD-3-Clause
// copyright-holders:Ryan Holtz
/******************************************************************************
*
* Sony PlayStation 2 disc controller device skeleton
*
* To Do:
* Everything
*
*/
#include "emu.h"
#include "iopcdvd.h"
DEFINE_DEVICE_TYPE(SONYIOP_CDVD, iop_cdvd_device, "iopcdvd", "PlayStation 2 disc controller")
/*static*/ const size_t iop_cdvd_device::BUFFER_SIZE = 16; // Total guess
iop_cdvd_device::iop_cdvd_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock)
: device_t(mconfig, SONYIOP_CDVD, tag, owner, clock)
, m_intc(*this, finder_base::DUMMY_TAG)
{
}
iop_cdvd_device::~iop_cdvd_device()
{
}
void iop_cdvd_device::device_start()
{
save_item(NAME(m_channel[0].m_buffer));
save_item(NAME(m_channel[0].m_curr));
save_item(NAME(m_channel[0].m_end));
save_item(NAME(m_channel[0].m_status));
save_item(NAME(m_channel[0].m_command));
save_item(NAME(m_channel[1].m_buffer));
save_item(NAME(m_channel[1].m_curr));
save_item(NAME(m_channel[1].m_end));
save_item(NAME(m_channel[1].m_status));
save_item(NAME(m_channel[1].m_command));
}
void iop_cdvd_device::device_reset()
{
for (offs_t i = 0; i < 2; i++)
{
memset(m_channel[i].m_buffer, 0, BUFFER_SIZE);
m_channel[i].m_curr = 0;
m_channel[i].m_end = 0;
m_channel[i].m_status = 0;
m_channel[i].m_command = 0;
}
m_channel[0].m_status |= CDVD_STATUS_IDLE;
m_channel[1].m_status |= CDVD_STATUS_IDLE;
}
READ8_MEMBER(iop_cdvd_device::read)
{
uint8_t ret = 0;
switch (offset)
{
case 0x04:
ret = m_channel[CHAN_SERVO].m_command;
logerror("%s: cdvd_r: Servo Command (%02x)\n", machine().describe_context(), ret);
break;
case 0x05:
ret = m_channel[CHAN_SERVO].m_status;
logerror("%s: cdvd_r: Servo Status (%02x)\n", machine().describe_context(), ret);
break;
case 0x16:
ret = m_channel[CHAN_DATA].m_command;
logerror("%s: cdvd_r: Data Command (%02x)\n", machine().describe_context(), ret);
break;
case 0x17:
ret = m_channel[CHAN_DATA].m_status;
logerror("%s: cdvd_r: Data Status (%02x)\n", machine().describe_context(), ret);
break;
case 0x18:
ret = data_fifo_pop();
logerror("%s: cdvd_r: Data FIFO Out (%02x) (%d left)\n", machine().describe_context(), ret, m_channel[CHAN_DATA].m_end - m_channel[CHAN_DATA].m_curr);
break;
default:
logerror("%s: cdvd_r: Unknown read: %08x\n", machine().describe_context(), 0x1f402000 + offset);
break;
}
return ret;
}
void iop_cdvd_device::data_fifo_push(uint8_t data)
{
drive_channel_t &channel = m_channel[CHAN_DATA];
if (channel.m_end >= BUFFER_SIZE)
{
return;
}
channel.m_buffer[channel.m_end++] = data;
}
uint8_t iop_cdvd_device::data_fifo_pop()
{
drive_channel_t &channel = m_channel[CHAN_DATA];
if (channel.m_end == channel.m_curr)
{
channel.m_status |= CDVD_STATUS_IDLE;
return 0;
}
const uint8_t ret = channel.m_buffer[channel.m_curr++];
if (channel.m_end == channel.m_curr)
{
channel.m_status |= CDVD_STATUS_IDLE;
channel.m_curr = 0;
channel.m_end = 0;
}
return ret;
}
WRITE8_MEMBER(iop_cdvd_device::write)
{
switch (offset)
{
case 0x16:
handle_data_command(data);
break;
case 0x17:
data_fifo_push(data);
logerror("%s: cdvd_w: Data FIFO push? %02x\n", machine().describe_context(), data);
break;
default:
logerror("%s: cdvd_w: Unknown write: %08x = %02x\n", machine().describe_context(), 0x1f402000 + offset, data);
break;
}
}
void iop_cdvd_device::handle_data_command(uint8_t data)
{
drive_channel_t &channel = m_channel[CHAN_DATA];
channel.m_command = data;
channel.m_status &= ~CDVD_STATUS_IDLE;
if (channel.m_end)
logerror("%s: cdvd_w: Data Command warning: Issuing command without reading previous results\n", machine().describe_context());
switch (data)
{
case 0x08:
logerror("%s: cdvd_w: Command 0x08?\n", machine().describe_context());
for (size_t i = 0; i < 8; i++)
data_fifo_push(0);
break;
case 0x15:
logerror("%s: cdvd_w: Command 0x15?\n", machine().describe_context());
data_fifo_push(1);
break;
case 0x40:
logerror("%s: cdvd_w: Command 0x40?\n", machine().describe_context());
data_fifo_push(0);
break;
case 0x41:
logerror("%s: cdvd_w: Command 0x41?\n", machine().describe_context());
for (size_t i = 0; i < 0x10; i++)
data_fifo_push(0);
break;
case 0x43:
logerror("%s: cdvd_w: Command 0x43?\n", machine().describe_context());
data_fifo_push(0);
break;
default:
logerror("%s: cdvd_w: Unknown command(?) %02x\n", machine().describe_context(), data);
break;
}
}