NAME
z8530_dma_status - Handle a DMA status exception
SYNOPSIS
void z8530_dma_status (struct z8530_channel *chan);
ARGUMENTS
chan Z8530 channel to process
DESCRIPTION
A status event occurred on the Z8530. We receive these for two reasons
when in DMA mode. Firstly if we finished a packet transfer we get one
and kick the next packet out. Secondly we may see a DCD change and have
to poke the protocol layer.