RT2860_H2M_BUSY
if (!(RAL_READ(sc, RT2860_H2M_MAILBOX) & RT2860_H2M_BUSY))
RAL_WRITE(sc, RT2860_H2M_MAILBOX, RT2860_H2M_BUSY | cid << 16 | arg);
if (!(tmp & RT2860_H2M_BUSY))
tmp = RT2860_H2M_BUSY | RT2860_TOKEN_NO_INTR << 16 | arg;