From: Alan Cox <alan@xxxxxxxxxx>
Implement serialize and turn on slave channel
Signed-off-by: Alan Cox <alan@xxxxxxxxxx>
---
drivers/ata/pata_sc1200.c | 29 +++++++++++++++++++++++++++--
1 files changed, 27 insertions(+), 2 deletions(-)
diff --git a/drivers/ata/pata_sc1200.c b/drivers/ata/pata_sc1200.c
index 9a4bdca..fd96b96 100644
--- a/drivers/ata/pata_sc1200.c
+++ b/drivers/ata/pata_sc1200.c
@@ -2,7 +2,6 @@
* New ATA layer SC1200 driver Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
*
* 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);
}
--
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