PL011_DMA_BUFFER_SIZE
BUG_ON(pending > PL011_DMA_BUFFER_SIZE);
BUG_ON(pending > PL011_DMA_BUFFER_SIZE);
uap->dmatx.buf = kmalloc(PL011_DMA_BUFFER_SIZE, GFP_KERNEL | __GFP_DMA);
uap->dmatx.len = PL011_DMA_BUFFER_SIZE;
uap->port.fifosize = PL011_DMA_BUFFER_SIZE;
uap->dmarx.last_residue = PL011_DMA_BUFFER_SIZE;
uap->dmarx.last_residue = PL011_DMA_BUFFER_SIZE;
db->buf = dma_alloc_coherent(chan->device->dev, PL011_DMA_BUFFER_SIZE,
db->len = PL011_DMA_BUFFER_SIZE;
PL011_DMA_BUFFER_SIZE, db->buf, db->dma);
if (count > PL011_DMA_BUFFER_SIZE)
count = PL011_DMA_BUFFER_SIZE;