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idectrl/atahle.c: call routine fill_buffer using a timer to avoid reentering read_data and losing data with ultra dma (nw)

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Also small comment changes.
This commit is contained in:
yz70s 2015-10-19 21:55:49 +02:00
parent 53348ed1df
commit 5c880f47f1
3 changed files with 16 additions and 6 deletions
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8
src/devices/machine/atahle.c
View File

@ -110,6 +110,7 @@ void ata_hle_device::device_start()
save_item(NAME(m_identify_buffer));
m_busy_timer = timer_alloc(TID_BUSY);
m_buffer_empty_timer = timer_alloc(TID_BUFFER_EMPTY);
}
void ata_hle_device::device_reset()
@ -158,6 +159,10 @@ void ata_hle_device::device_timer(emu_timer &timer, device_timer_id id, int para
finished_busy(param);
break;
case TID_BUFFER_EMPTY:
m_buffer_empty_timer->enable(false);
fill_buffer();
break;
}
}
@ -465,7 +470,8 @@ void ata_hle_device::read_buffer_empty()
if ((multi_word_dma_mode() >= 0) || (ultra_dma_mode() >= 0))
set_dmarq(CLEAR_LINE);
fill_buffer();
m_buffer_empty_timer->enable(true);
m_buffer_empty_timer->adjust(attotime::zero);
}
void ata_hle_device::write_buffer_full()

6
src/devices/machine/atahle.h
View File

@ -34,6 +34,8 @@ public:
virtual DECLARE_WRITE_LINE_MEMBER(write_dmack);
virtual DECLARE_WRITE_LINE_MEMBER(write_pdiag);
TIMER_CALLBACK_MEMBER(buffer_empty_timer_work);
protected:
virtual void device_start();
virtual void device_reset();
@ -160,7 +162,8 @@ protected:
enum
{
TID_BUSY
TID_BUSY,
TID_BUFFER_EMPTY
};
enum
@ -213,6 +216,7 @@ private:
bool m_resetting;
emu_timer *m_busy_timer;
emu_timer *m_buffer_empty_timer;
};
#endif

8
src/devices/machine/idectrl.c
View File

@ -274,11 +274,11 @@ WRITE32_MEMBER( bus_master_ide_controller_device::bmdma_w )
case 0:
if( ACCESSING_BITS_0_7 )
{
/* command register */
/* Bus Master IDE Command register */
UINT8 old = m_bus_master_command;
UINT8 val = data & 0xff;
/* save the read/write bit and the start/stop bit */
/* save the "Read or Write Control" bit 3 and the "Start/Stop Bus Master" bit 0 */
m_bus_master_command = (old & 0xf6) | (val & 0x09);
if ((old ^ m_bus_master_command) & 1)
@ -306,7 +306,7 @@ WRITE32_MEMBER( bus_master_ide_controller_device::bmdma_w )
if( ACCESSING_BITS_16_23 )
{
/* status register */
/* Bus Master IDE Status register */
UINT8 old = m_bus_master_status;
UINT8 val = data >> 16;
@ -334,7 +334,7 @@ void bus_master_ide_controller_device::execute_dma()
while (m_dmarq && (m_bus_master_status & IDE_BUSMASTER_STATUS_ACTIVE))
{
/* if we're out of space, grab the next descriptor */
/* if we're out of space, grab the next Physical Region Descriptor */
if (m_dma_bytes_left == 0)
{
/* fetch the address */