A_SG_INT_CAUSE
t1_write_reg_4(chp->sge->obj, A_SG_INT_CAUSE, 0x0);
status = t1_read_reg_4(sge->obj, A_SG_INT_CAUSE);
t1_write_reg_4(sge->obj, A_SG_INT_CAUSE, status);
t1_write_reg_4(sge->obj, A_SG_INT_CAUSE, 0xffffffff);
u32 cause = t1_read_reg_4(obj, A_SG_INT_CAUSE);
t1_write_reg_4(obj, A_SG_INT_CAUSE, cause);