ATA_AHCI_P_TFD
tf_data = ATA_INL(ctlr->r_res2, ATA_AHCI_P_TFD + (ch->unit<<7));
tf_data = ATA_INL(ctlr->r_res2, ATA_AHCI_P_TFD + offset);
while ((val = ATA_INL(ctlr->r_res2, ATA_AHCI_P_TFD + offset)) &