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ata: Report 16/32bit PIO as best we can

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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>
This commit is contained in:
Alan Cox
2009-04-09 17:31:17 +01:00
committed by Jeff Garzik
parent 62afe5d744
commit e3cf95dd6d
5 changed files with 84 additions and 18 deletions
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30
drivers/ata/libata-scsi.c
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@ -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);