/*******************************************************************************
* mvDmaCommandSet - Set command to DMA channel
*
* DESCRIPTION:
* DMA channel can be started, idel, paused and restarted.
* Paused can be set only if channel is active.
* Start can be set only if channel is idle.
* Restart can be set only if channel is paused.
* Stop activate the channel abort which cause the DMA to aborts in the
* middle of a transaction.
*
* INPUT:
* chan - IDMA channel number. See MV_DMA_CHANNEL enumerator.
* command - Requested command. See MV_COMMAND enumerator.
*
* OUTPUT:
* None.
*
* RETURN:
* MV_ERROR if requested command can not be set.
*
*******************************************************************************/
MV_STATUS mvDmaCommandSet(MV_U32 chan, MV_COMMAND command)
{
MV_U32 ctrlLow;
MV_U32 dmaStatus;
/* Read control low register */
ctrlLow = MV_REG_READ(IDMA_CTRL_LOW_REG(chan));
/* Get current DMA status */
dmaStatus = mvDmaStateGet(chan);
if ((command == MV_START) && (dmaStatus == MV_IDLE))
{
/* To start, set DMA channel enable bit */
ctrlLow |= ICCLR_CHAN_ENABLE;
}
else if ((command == MV_PAUSE) && (dmaStatus == MV_ACTIVE))
{
/* To pause, reset DMA channel enable bit */
ctrlLow &= ~ICCLR_CHAN_ENABLE;
}
else if ((command == MV_RESTART) && (dmaStatus == MV_PAUSED))
{
/* To restart, set DMA channel enable bit */
ctrlLow |= ICCLR_CHAN_ENABLE;
}
else if (command == MV_STOP)
{
/* To stop, set DMA channel abort bit */
ctrlLow |= ICCLR_CHANNEL_ABORT;
}
else
{
DB(mvOsPrintf("mvDmaCommandSet: ERR. Can not set command %d in \
status %d\n", command, dmaStatus));
return MV_ERROR;
}
/* Write control word to register */
MV_REG_WRITE(IDMA_CTRL_LOW_REG(chan), ctrlLow);
/* If comman is stop, ensure channel is stopped */
if (command == MV_STOP)
{
while(MV_IDLE != mvDmaStateGet(chan));
}
return MV_OK;
}
unsigned int wait_for_idma(MV_U32 channel)
{
u32 timeout = 0;
/* wait for completion */
while( mvDmaStateGet(channel) != MV_IDLE )
{
DPRINTK(" ctrl low is %x \n", MV_REG_READ(IDMA_CTRL_LOW_REG(channel)));
//udelay(1);
#ifdef RT_DEBUG
dma_wait_loops++;
#endif
if(timeout++ > CPY_DMA_TIMEOUT)
{
printk("dma_copy: IDMA %d timed out , ctrl low is %x \n",
channel, MV_REG_READ(IDMA_CTRL_LOW_REG(channel)));
return 1;
}
}
DPRINTK("IDMA complete in %x \n", timeout);
return 0;
}
