pch_setbit
pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_I2CCTL_I2CMEN);
pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_START);
pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_REPSTART);
pch_setbit(adap->pch_base_address, PCH_I2CCTL, I2C_TX_MODE);
pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_ACK);
pch_setbit(adap->pch_base_address, PCH_I2CCTL, PCH_RESTART);