void *mmio = (void *) sil_scr_addr(ap, sc_reg);
void *mmio = (void __iomem *) sil_scr_addr(ap, sc_reg);
static void sil_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val){	void *mmio = (void *) sil_scr_addr(ap, sc_reg);	if (mmio)		writel(val, mmio);}