FT010_IRQ_MASK
writel(0, FT010_IRQ_MASK(f->base));
mask = readl(FT010_IRQ_MASK(f->base));
writel(mask, FT010_IRQ_MASK(f->base));
mask = readl(FT010_IRQ_MASK(f->base));
writel(mask, FT010_IRQ_MASK(f->base));