AHCI_P_SSTS
u_int32_t status = ATA_INL(ch->r_mem, AHCI_P_SSTS);
status = ATA_INL(ch->r_mem, AHCI_P_SSTS);
status = ATA_INL(ch->r_mem, AHCI_P_SSTS) & ATA_SS_SPD_MASK;
case AHCI_P_SSTS:
case AHCI_P_SSTS: