diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ata/sata_nv.c | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c index 3dd5ca16a2b..19817b37616 100644 --- a/drivers/ata/sata_nv.c +++ b/drivers/ata/sata_nv.c @@ -1159,16 +1159,31 @@ static void nv_adma_fill_sg(struct ata_queued_cmd *qc, struct nv_adma_cpb *cpb) cpb->next_aprd = cpu_to_le64(((u64)(pp->aprd_dma + NV_ADMA_SGTBL_SZ * qc->tag))); } +static int nv_adma_use_reg_mode(struct ata_queued_cmd *qc) +{ + struct nv_adma_port_priv *pp = qc->ap->private_data; + + /* ADMA engine can only be used for non-ATAPI DMA commands, + or interrupt-driven no-data commands. */ + if((pp->flags & NV_ADMA_ATAPI_SETUP_COMPLETE) || + (qc->tf.flags & ATA_TFLAG_POLLING)) + return 1; + + if((qc->flags & ATA_QCFLAG_DMAMAP) || + (qc->tf.protocol == ATA_PROT_NODATA)) + return 0; + + return 1; +} + static void nv_adma_qc_prep(struct ata_queued_cmd *qc) { struct nv_adma_port_priv *pp = qc->ap->private_data; struct nv_adma_cpb *cpb = &pp->cpb[qc->tag]; u8 ctl_flags = NV_CPB_CTL_CPB_VALID | - NV_CPB_CTL_APRD_VALID | NV_CPB_CTL_IEN; - if (!(qc->flags & ATA_QCFLAG_DMAMAP) || - (pp->flags & NV_ADMA_ATAPI_SETUP_COMPLETE)) { + if (nv_adma_use_reg_mode(qc)) { nv_adma_register_mode(qc->ap); ata_qc_prep(qc); return; @@ -1188,7 +1203,11 @@ static void nv_adma_qc_prep(struct ata_queued_cmd *qc) nv_adma_tf_to_cpb(&qc->tf, cpb->tf); - nv_adma_fill_sg(qc, cpb); + if(qc->flags & ATA_QCFLAG_DMAMAP) { + nv_adma_fill_sg(qc, cpb); + ctl_flags |= NV_CPB_CTL_APRD_VALID; + } else + memset(&cpb->aprd[0], 0, sizeof(struct nv_adma_prd) * 5); /* Be paranoid and don't let the device see NV_CPB_CTL_CPB_VALID until we are finished filling in all of the contents */ @@ -1203,10 +1222,9 @@ static unsigned int nv_adma_qc_issue(struct ata_queued_cmd *qc) VPRINTK("ENTER\n"); - if (!(qc->flags & ATA_QCFLAG_DMAMAP) || - (pp->flags & NV_ADMA_ATAPI_SETUP_COMPLETE)) { + if (nv_adma_use_reg_mode(qc)) { /* use ATA register mode */ - VPRINTK("no dmamap or ATAPI, using ATA register mode: 0x%lx\n", qc->flags); + VPRINTK("using ATA register mode: 0x%lx\n", qc->flags); nv_adma_register_mode(qc->ap); return ata_qc_issue_prot(qc); } else |