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author | Alan Cox <alan@lxorguk.ukuu.org.uk> | 2009-04-09 17:31:17 +0100 |
---|---|---|
committer | Jeff Garzik <jgarzik@redhat.com> | 2009-04-16 15:28:23 -0400 |
commit | e3cf95dd6d352954b663d2934110d6e30af2406d (patch) | |
tree | f3245e91c30e0c1e12a169af637373a8b5ff670a /drivers/ata/libata-scsi.c | |
parent | 62afe5d744047df8ff15a369f4c1ebad71c937d4 (diff) | |
download | kernel_samsung_tuna-e3cf95dd6d352954b663d2934110d6e30af2406d.zip kernel_samsung_tuna-e3cf95dd6d352954b663d2934110d6e30af2406d.tar.gz kernel_samsung_tuna-e3cf95dd6d352954b663d2934110d6e30af2406d.tar.bz2 |
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.c | 30 |
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); |