Source of acard-ahci.c - linux-imx - PHYTEC BitBucket (Stash)

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    int is_atapi = ata_is_atapi(qc->tf.protocol);
    void *cmd_tbl;
    u32 opts;
    const u32 cmd_fis_len = 5; /* five dwords */
    unsigned int n_elem;
​
    /*
     * Fill in command table information.  First, the header,
     * a SATA Register - Host to Device command FIS.
     */
    cmd_tbl = pp->cmd_tbl + qc->tag * AHCI_CMD_TBL_SZ;
    cmd_tbl = pp->cmd_tbl + qc->hw_tag * AHCI_CMD_TBL_SZ;
​
    ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, cmd_tbl);
    if (is_atapi) {
        memset(cmd_tbl + AHCI_CMD_TBL_CDB, 0, 32);
        memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
    }
​
    n_elem = 0;
    if (qc->flags & ATA_QCFLAG_DMAMAP)
        n_elem = acard_ahci_fill_sg(qc, cmd_tbl);
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     * Fill in command slot information.
     *
     * ACard note: prd table length not filled in
     */
    opts = cmd_fis_len | (qc->dev->link->pmp << 12);
    if (qc->tf.flags & ATA_TFLAG_WRITE)
        opts |= AHCI_CMD_WRITE;
    if (is_atapi)
        opts |= AHCI_CMD_ATAPI | AHCI_CMD_PREFETCH;
​
    ahci_fill_cmd_slot(pp, qc->tag, opts);
    ahci_fill_cmd_slot(pp, qc->hw_tag, opts);
}
​
static bool acard_ahci_qc_fill_rtf(struct ata_queued_cmd *qc)
{
    struct ahci_port_priv *pp = qc->ap->private_data;
    u8 *rx_fis = pp->rx_fis;
​
    if (pp->fbs_enabled)
        rx_fis += qc->dev->link->pmp * ACARD_AHCI_RX_FIS_SZ;
​