void *mmio = (void *) sil_scr_addr(ap, sc_reg);
void __iomem *mmio = (void __iomem *) sil_scr_addr(ap, sc_reg);
static u32 sil_scr_read (struct ata_port *ap, unsigned int sc_reg){	void *mmio = (void *) sil_scr_addr(ap, sc_reg);	if (mmio)		return readl(mmio);	return 0xffffffffU;}