OWL_DMA_IRQ_PD0
irq_pd = dma_readl(od, OWL_DMA_IRQ_PD0);
dma_writel(od, OWL_DMA_IRQ_PD0, (1 << pchan->id));
pending = dma_readl(od, OWL_DMA_IRQ_PD0);
dma_writel(od, OWL_DMA_IRQ_PD0, pending);
dma_readl(od, OWL_DMA_IRQ_PD0);
global_irq_pending = dma_readl(od, OWL_DMA_IRQ_PD0);