REG_MSU_MSC0BAR
msc->orig_addr = ioread32(msc->reg_base + REG_MSU_MSC0BAR);
iowrite32(reg, msc->reg_base + REG_MSU_MSC0BAR);
iowrite32(msc->orig_addr, msc->reg_base + REG_MSU_MSC0BAR);