NPCM_I2CRXF_CTL
iowrite8(rxf_ctl, bus->reg + NPCM_I2CRXF_CTL);
iowrite8(bus->data->fifo_size, bus->reg + NPCM_I2CRXF_CTL);
iowrite8(0, bus->reg + NPCM_I2CRXF_CTL);
iowrite8(bus->data->fifo_size, bus->reg + NPCM_I2CRXF_CTL);
iowrite8(0, bus->reg + NPCM_I2CRXF_CTL);
(bus->data->rxf_ctl_last_pec & ioread8(bus->reg + NPCM_I2CRXF_CTL)))