writel
#define writel(va, d) (*(volatile uint32_t *) (va) = (d))
#undef writel
writel(uint32_t v, volatile void *addr)
#define writel(v, addr) writel(v, addr)
#define writel(va, d) (*(volatile uint32_t *) (va) = (d))
writel(int strm, ...)