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i8089: add support for DMA_WAIT_FOR_SOURCE_DRQ

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This commit is contained in:
Dirk Best 2015-06-07 03:19:14 +02:00
parent 3db351f5c9
commit cf7eb6a396
2 changed files with 13 additions and 4 deletions
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16
src/emu/cpu/i8089/i8089_channel.c
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@ -51,10 +51,13 @@ const device_type I8089_CHANNEL = &device_creator<i8089_channel>;
i8089_channel::i8089_channel(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : i8089_channel::i8089_channel(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) :
device_t(mconfig, I8089_CHANNEL, "Intel 8089 I/O Channel", tag, owner, clock, "i8089_channel", __FILE__), device_t(mconfig, I8089_CHANNEL, "Intel 8089 I/O Channel", tag, owner, clock, "i8089_channel", __FILE__),
m_write_sintr(*this), m_write_sintr(*this),
m_iop(NULL),
m_icount(0), m_icount(0),
m_xfer_pending(false), m_xfer_pending(false),
m_dma_value(0), m_dma_value(0),
m_dma_state(DMA_IDLE) m_dma_state(DMA_IDLE),
m_drq(0),
m_prio(PRIO_IDLE)
{ {
} }
@ -74,6 +77,7 @@ void i8089_channel::device_start()
save_item(NAME(m_xfer_pending)); save_item(NAME(m_xfer_pending));
save_item(NAME(m_dma_value)); save_item(NAME(m_dma_value));
save_item(NAME(m_dma_state)); save_item(NAME(m_dma_state));
save_item(NAME(m_drq));
save_item(NAME(m_prio)); save_item(NAME(m_prio));
for (int i = 0; i < ARRAY_LENGTH(m_r); i++) for (int i = 0; i < ARRAY_LENGTH(m_r); i++)
@ -246,11 +250,13 @@ int i8089_channel::execute_run()
break; break;
case DMA_WAIT_FOR_SOURCE_DRQ: case DMA_WAIT_FOR_SOURCE_DRQ:
fatalerror("%s('%s'): wait for source drq not supported\n", shortname(), tag()); if (m_drq)
m_dma_state = DMA_FETCH;
break;
case DMA_FETCH: case DMA_FETCH:
if (VERBOSE_DMA) if (VERBOSE_DMA)
logerror("%s('%s'): entering state: DMA_FETCH", shortname(), tag()); logerror("%s('%s'): entering state: DMA_FETCH\n", shortname(), tag());
// source is 16-bit? // source is 16-bit?
if (BIT(m_r[PSW].w, 1)) if (BIT(m_r[PSW].w, 1))
@ -834,5 +840,7 @@ WRITE_LINE_MEMBER( i8089_channel::ext_w )
WRITE_LINE_MEMBER( i8089_channel::drq_w ) WRITE_LINE_MEMBER( i8089_channel::drq_w )
{ {
if (VERBOSE) if (VERBOSE)
logerror("%s('%s'): ext_w: %d\n", shortname(), tag(), state); logerror("%s('%s'): drq_w: %d\n", shortname(), tag(), state);
m_drq = state;
} }

1
src/emu/cpu/i8089/i8089_channel.h
View File

@ -186,6 +186,7 @@ private:
bool m_xfer_pending; bool m_xfer_pending;
UINT16 m_dma_value; UINT16 m_dma_value;
int m_dma_state; int m_dma_state;
bool m_drq;
// dma state // dma state
enum enum