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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>
This commit is contained in:
Alan Cox 2009-03-24 10:21:49 +00:00 committed by Jeff Garzik
parent 208f2a886a
commit 140d6fed71
1 changed files with 27 additions and 6 deletions
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33
drivers/ata/pata_artop.c
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@ -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 @@ static void artop6260_set_dmamode (struct ata_port *ap, struct ata_device *adev)
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 @@ static struct ata_port_operations artop6210_ops = {
.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 @@ static int artop_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
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;