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pata_sc1200: Activate secondary channel

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Implement serialize and turn on slave channel

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Alan Cox 2009-03-24 10:22:25 +00:00 committed by Jeff Garzik
parent 140d6fed71
commit c0f2ee34a5
1 changed files with 27 additions and 2 deletions
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29
drivers/ata/pata_sc1200.c
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@ -2,7 +2,6 @@
* New ATA layer SC1200 driver Alan Cox <alan@lxorguk.ukuu.org.uk>
*
* TODO: Mode selection filtering
* TODO: Can't enable second channel until ATA core has serialize
* TODO: Needs custom DMA cleanup code
*
* Based very heavily on
@ -178,6 +177,31 @@ static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
return ata_sff_qc_issue(qc);
}
/**
* sc1200_qc_defer - implement serialization
* @qc: command
*
* Serialize command issue on this controller.
*/
static int sc1200_qc_defer(struct ata_queued_cmd *qc)
{
struct ata_host *host = qc->ap->host;
struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
int rc;
/* First apply the usual rules */
rc = ata_std_qc_defer(qc);
if (rc != 0)
return rc;
/* Now apply serialization rules. Only allow a command if the
other channel state machine is idle */
if (alt && alt->qc_active)
return ATA_DEFER_PORT;
return 0;
}
static struct scsi_host_template sc1200_sht = {
ATA_BMDMA_SHT(DRV_NAME),
.sg_tablesize = LIBATA_DUMB_MAX_PRD,
@ -187,6 +211,7 @@ static struct ata_port_operations sc1200_port_ops = {
.inherits = &ata_bmdma_port_ops,
.qc_prep = ata_sff_dumb_qc_prep,
.qc_issue = sc1200_qc_issue,
.qc_defer = sc1200_qc_defer,
.cable_detect = ata_cable_40wire,
.set_piomode = sc1200_set_piomode,
.set_dmamode = sc1200_set_dmamode,
@ -211,7 +236,7 @@ static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
.port_ops = &sc1200_port_ops
};
/* Can't enable port 2 yet, see top comments */
const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
const struct ata_port_info *ppi[] = { &info, };
return ata_pci_sff_init_one(dev, ppi, &sc1200_sht, NULL);
}