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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2009-04-09 17:31:17 +0100
committerJeff Garzik <jgarzik@redhat.com>2009-04-16 15:28:23 -0400
commite3cf95dd6d352954b663d2934110d6e30af2406d (patch)
treef3245e91c30e0c1e12a169af637373a8b5ff670a /drivers/ata/libata-scsi.c
parent62afe5d744047df8ff15a369f4c1ebad71c937d4 (diff)
downloadop-kernel-dev-e3cf95dd6d352954b663d2934110d6e30af2406d.zip
op-kernel-dev-e3cf95dd6d352954b663d2934110d6e30af2406d.tar.gz
ata: Report 16/32bit PIO as best we can
The legacy old IDE ioctl API for this is a bit primitive so we try and map stuff sensibly onto it. - Set PIO over DMA devices to report 32bit - Add ability to change the PIO32 settings if the controller permits it - Add that functionality into the sff drivers - Add that functionality into the VLB legacy driver - Turn on the 32bit PIO on the ninja32 and add support there Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers/ata/libata-scsi.c')
-rw-r--r--drivers/ata/libata-scsi.c30
1 files changed, 26 insertions, 4 deletions
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index b9747fa..2733b0c 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -647,23 +647,45 @@ int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg)
return rc;
}
+static int ata_ioc32(struct ata_port *ap)
+{
+ if (ap->flags & ATA_FLAG_PIO_DMA)
+ return 1;
+ if (ap->pflags & ATA_PFLAG_PIO32)
+ return 1;
+ return 0;
+}
+
int ata_sas_scsi_ioctl(struct ata_port *ap, struct scsi_device *scsidev,
int cmd, void __user *arg)
{
int val = -EINVAL, rc = -EINVAL;
+ unsigned long flags;
switch (cmd) {
case ATA_IOC_GET_IO32:
- val = 0;
+ spin_lock_irqsave(ap->lock, flags);
+ val = ata_ioc32(ap);
+ spin_unlock_irqrestore(ap->lock, flags);
if (copy_to_user(arg, &val, 1))
return -EFAULT;
return 0;
case ATA_IOC_SET_IO32:
val = (unsigned long) arg;
- if (val != 0)
- return -EINVAL;
- return 0;
+ rc = 0;
+ spin_lock_irqsave(ap->lock, flags);
+ if (ap->pflags & ATA_PFLAG_PIO32CHANGE) {
+ if (val)
+ ap->pflags |= ATA_PFLAG_PIO32;
+ else
+ ap->pflags &= ~ATA_PFLAG_PIO32;
+ } else {
+ if (val != ata_ioc32(ap))
+ rc = -EINVAL;
+ }
+ spin_unlock_irqrestore(ap->lock, flags);
+ return rc;
case HDIO_GET_IDENTITY:
return ata_get_identity(ap, scsidev, arg);
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