REG_MSU_MSUSTS
u32 msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS);
iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS);
msusts = ioread32(msc->msu_base + REG_MSU_MSUSTS);
iowrite32(msusts, msc->msu_base + REG_MSU_MSUSTS);
reg = ioread32(msc->reg_base + REG_MSU_MSUSTS);
iowrite32(reg, msc->reg_base + REG_MSU_MSUSTS);