pata_artop: Serializing support
Enable both ports on the 6210 and serialize them
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/pata_artop.c b/drivers/ata/pata_artop.c
index 07c7fae..d332cfd 100644
--- a/drivers/ata/pata_artop.c
+++ b/drivers/ata/pata_artop.c
@@ -12,7 +12,6 @@
* performance Alessandro Zummo <alessandro.zummo@towertech.it>
*
* TODO
- * 850 serialization once the core supports it
* Investigate no_dsc on 850R
* Clock detect
*/
@@ -29,7 +28,7 @@
#include <linux/ata.h>
#define DRV_NAME "pata_artop"
-#define DRV_VERSION "0.4.4"
+#define DRV_VERSION "0.4.5"
/*
* The ARTOP has 33 Mhz and "over clocked" timing tables. Until we
@@ -283,6 +282,31 @@
pci_write_config_byte(pdev, 0x44 + ap->port_no, ultra);
}
+/**
+ * artop_6210_qc_defer - implement serialization
+ * @qc: command
+ *
+ * Issue commands per host on this chip.
+ */
+
+static int artop6210_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 artop_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
@@ -293,6 +317,7 @@
.set_piomode = artop6210_set_piomode,
.set_dmamode = artop6210_set_dmamode,
.prereset = artop6210_pre_reset,
+ .qc_defer = artop6210_qc_defer,
};
static struct ata_port_operations artop6260_ops = {
@@ -362,12 +387,8 @@
if (id->driver_data == 0) { /* 6210 variant */
ppi[0] = &info_6210;
- ppi[1] = &ata_dummy_port_info;
/* BIOS may have left us in UDMA, clear it before libata probe */
pci_write_config_byte(pdev, 0x54, 0);
- /* For the moment (also lacks dsc) */
- printk(KERN_WARNING "ARTOP 6210 requires serialize functionality not yet supported by libata.\n");
- printk(KERN_WARNING "Secondary ATA ports will not be activated.\n");
}
else if (id->driver_data == 1) /* 6260 */
ppi[0] = &info_626x;