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Preliminary ATAPI/Dreamcast DMA. The timing needs to be moved into the devices, so the timing hack can be removed from the driver. [smf]

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This commit is contained in:
smf- 2013-09-08 21:17:18 +00:00
parent 712b2a838c
commit 7b00ef3c97
3 changed files with 70 additions and 45 deletions
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99
src/emu/machine/atapihle.c
View File

@ -34,29 +34,15 @@ void atapi_hle_device::process_buffer()
if (m_buffer_size > ATAPI_BUFFER_LENGTH || m_buffer_size == 0)
m_buffer_size = ATAPI_BUFFER_LENGTH;
// TODO: dma flag
if (m_feature & ATAPI_FEATURES_FLAG_OVL)
{
printf( "ATAPI_FEATURES_FLAG_OVL not supported\n" );
}
switch (phase)
{
case SCSI_PHASE_DATAOUT:
if (m_buffer_size > m_data_size)
{
m_buffer_size = m_data_size;
}
m_cylinder_low = m_buffer_size & 0xff;
m_cylinder_high = m_buffer_size >> 8;
if (m_buffer_size > 0)
{
m_status |= IDE_STATUS_DRQ;
m_sector_count = 0;
}
else
{
m_sector_count = ATAPI_INTERRUPT_REASON_IO | ATAPI_INTERRUPT_REASON_CD;
}
set_irq(ASSERT_LINE);
wait_buffer();
break;
case SCSI_PHASE_DATAIN:
@ -82,25 +68,7 @@ void atapi_hle_device::process_buffer()
m_scsidev_device->WriteData( m_buffer, m_buffer_size );
m_data_size -= m_buffer_size;
if (m_buffer_size > m_data_size)
{
m_buffer_size = m_data_size;
}
m_cylinder_low = m_buffer_size & 0xff;
m_cylinder_high = m_buffer_size >> 8;
if (m_buffer_size > 0)
{
m_status |= IDE_STATUS_DRQ;
m_sector_count = 0;
}
else
{
m_sector_count = ATAPI_INTERRUPT_REASON_IO | ATAPI_INTERRUPT_REASON_CD;
}
set_irq(ASSERT_LINE);
wait_buffer();
break;
}
}
@ -111,10 +79,14 @@ void atapi_hle_device::fill_buffer()
switch (m_command)
{
case IDE_COMMAND_PACKET:
if (m_buffer_size > m_data_size)
if (m_buffer_size >= m_data_size)
{
m_buffer_size = m_data_size;
}
else if (m_buffer_size & 1)
{
m_buffer_size--;
}
m_cylinder_low = m_buffer_size & 0xff;
m_cylinder_high = m_buffer_size >> 8;
@ -126,13 +98,21 @@ void atapi_hle_device::fill_buffer()
m_status |= IDE_STATUS_DRQ;
m_sector_count = ATAPI_INTERRUPT_REASON_IO;
if (m_feature & ATAPI_FEATURES_FLAG_DMA)
{
set_dmarq(ASSERT_LINE);
}
else
{
set_irq(ASSERT_LINE);
}
}
else
{
m_sector_count = ATAPI_INTERRUPT_REASON_IO | ATAPI_INTERRUPT_REASON_CD;
set_irq(ASSERT_LINE);
}
set_irq(ASSERT_LINE);
break;
case IDE_COMMAND_IDENTIFY_PACKET_DEVICE:
@ -145,6 +125,41 @@ void atapi_hle_device::fill_buffer()
}
}
void atapi_hle_device::wait_buffer()
{
if (m_buffer_size >= m_data_size)
{
m_buffer_size = m_data_size;
}
else if (m_buffer_size & 1)
{
m_buffer_size--;
}
m_cylinder_low = m_buffer_size & 0xff;
m_cylinder_high = m_buffer_size >> 8;
if (m_buffer_size > 0)
{
m_status |= IDE_STATUS_DRQ;
m_sector_count = 0;
if (m_feature & ATAPI_FEATURES_FLAG_DMA)
{
set_dmarq(ASSERT_LINE);
}
else
{
set_irq(ASSERT_LINE);
}
}
else
{
m_sector_count = ATAPI_INTERRUPT_REASON_IO | ATAPI_INTERRUPT_REASON_CD;
set_irq(ASSERT_LINE);
}
}
void atapi_hle_device::signature()
{
// TODO: IDENTIFY DEVICE & READ SECTORS writes signature too.

10
src/emu/machine/atapihle.h
View File

@ -22,7 +22,13 @@ class atapi_hle_device : public ata_hle_device
public:
atapi_hle_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock,const char *shortname, const char *source);
enum
enum atapi_features_flag_t
{
ATAPI_FEATURES_FLAG_DMA = 0x01,
ATAPI_FEATURES_FLAG_OVL = 0x02
};
enum atapi_interrupt_reason_t
{
ATAPI_INTERRUPT_REASON_CD = 0x01, // 1 = command, 0 = data
ATAPI_INTERRUPT_REASON_IO = 0x02, // 1 = to host, 0 = to device
@ -59,6 +65,8 @@ protected:
packet_command_response_t packet_command_response();
private:
void wait_buffer();
int m_packet;
int m_data_size;
required_device<scsihle_device> m_scsidev_device;

6
src/mess/machine/dccons.c
View File

@ -46,7 +46,7 @@ TIMER_CALLBACK_MEMBER(dc_cons_state::atapi_xfer_end )
//mame_printf_debug("ATAPI: xfer_end. xferlen = %d\n", atapi_xferlen);
address_space &space = m_maincpu->space(AS_PROGRAM);
m_ata->write_dmack(1);
while (atapi_xferlen > 0 )
{
@ -55,7 +55,7 @@ TIMER_CALLBACK_MEMBER(dc_cons_state::atapi_xfer_end )
// get a sector from the SCSI device
for (int i = 0; i < 2048/2; i++)
{
int d = m_ata->read_cs0(space, 0, 0xffff);
int d = m_ata->read_dma();
sector_buffer[ i*2 ] = d & 0xff;
sector_buffer[ (i*2)+1 ] = d >> 8;
}
@ -76,6 +76,8 @@ TIMER_CALLBACK_MEMBER(dc_cons_state::atapi_xfer_end )
atapi_xferbase += 2048;
}
m_ata->write_dmack(0);
g1bus_regs[SB_GDST]=0;
dc_sysctrl_regs[SB_ISTNRM] |= IST_DMA_GDROM;
dc_update_interrupt_status();