/*
* We implement our own qc_issue() callback since we may need to set up
* the timings differently for master and slave transfers: the CLK_MOD_REG
* and MWDMA_TIMING_REG is shared between master and slave, so reprogramming
* this may be necessary.
*/
static unsigned int ftide010_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
/*
* If the device changed, i.e. slave->master, master->slave,
* then set up the DMA mode again so we are sure the timings
* are correct.
*/
if (adev != ap->private_data && ata_dma_enabled(adev))
ftide010_set_dmamode(ap, adev);
return ata_bmdma_qc_issue(qc);
}
static unsigned int pacpi_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
struct pata_acpi *acpi = ap->private_data;
if (acpi->gtm.flags & 0x10)
return ata_sff_qc_issue(qc);
if (adev != acpi->last) {
pacpi_set_piomode(ap, adev);
if (ata_dma_enabled(adev))
pacpi_set_dmamode(ap, adev);
acpi->last = adev;
}
return ata_sff_qc_issue(qc);
}
static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
struct ata_device *prev = ap->private_data;
/* See if the DMA settings could be wrong */
if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
/* Maybe, but do the channels match MWDMA/UDMA ? */
if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
(ata_using_udma(prev) && !ata_using_udma(adev)))
/* Switch the mode bits */
sc1200_set_dmamode(ap, adev);
}
return ata_bmdma_qc_issue(qc);
}
static unsigned int cs5530_qc_issue(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
struct ata_device *prev = ap->private_data;
if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
(ata_using_udma(prev) && !ata_using_udma(adev)))
cs5530_set_dmamode(ap, adev);
}
return ata_bmdma_qc_issue(qc);
}