diff options
| -rw-r--r-- | hw/dma/sifive_pdma.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/hw/dma/sifive_pdma.c b/hw/dma/sifive_pdma.c index b8ec762..85fe34f 100644 --- a/hw/dma/sifive_pdma.c +++ b/hw/dma/sifive_pdma.c @@ -232,7 +232,7 @@ static void sifive_pdma_write(void *opaque, hwaddr offset, { SiFivePDMAState *s = opaque; int ch = SIFIVE_PDMA_CHAN_NO(offset); - bool claimed; + bool claimed, run; if (ch >= SIFIVE_PDMA_CHANS) { qemu_log_mask(LOG_GUEST_ERROR, "%s: Invalid channel no %d\n", @@ -244,6 +244,7 @@ static void sifive_pdma_write(void *opaque, hwaddr offset, switch (offset) { case DMA_CONTROL: claimed = !!(s->chan[ch].control & CONTROL_CLAIM); + run = !!(s->chan[ch].control & CONTROL_RUN); if (!claimed && (value & CONTROL_CLAIM)) { /* reset Next* registers */ @@ -254,13 +255,19 @@ static void sifive_pdma_write(void *opaque, hwaddr offset, s->chan[ch].next_src = 0; } + /* claim bit can only be cleared when run is low */ + if (run && !(value & CONTROL_CLAIM)) { + value |= CONTROL_CLAIM; + } + s->chan[ch].control = value; /* * If channel was not claimed before run bit is set, + * or if the channel is disclaimed when run was low, * DMA won't run. */ - if (!claimed) { + if (!claimed || (!run && !(value & CONTROL_CLAIM))) { s->chan[ch].control &= ~CONTROL_RUN; return; } |