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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-sff.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-sff.c')
-rw-r--r--drivers/ata/libata-sff.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/ata/libata-sff.c b/drivers/ata/libata-sff.c
index 8332e97..bb18415 100644
--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -87,6 +87,7 @@ const struct ata_port_operations ata_bmdma32_port_ops = {
.inherits = &ata_bmdma_port_ops,
.sff_data_xfer = ata_sff_data_xfer32,
+ .port_start = ata_sff_port_start32,
};
EXPORT_SYMBOL_GPL(ata_bmdma32_port_ops);
@@ -769,6 +770,9 @@ unsigned int ata_sff_data_xfer32(struct ata_device *dev, unsigned char *buf,
void __iomem *data_addr = ap->ioaddr.data_addr;
unsigned int words = buflen >> 2;
int slop = buflen & 3;
+
+ if (!(ap->pflags & ATA_PFLAG_PIO32))
+ return ata_sff_data_xfer(dev, buf, buflen, rw);
/* Transfer multiple of 4 bytes */
if (rw == READ)
@@ -2402,6 +2406,29 @@ int ata_sff_port_start(struct ata_port *ap)
EXPORT_SYMBOL_GPL(ata_sff_port_start);
/**
+ * ata_sff_port_start32 - Set port up for dma.
+ * @ap: Port to initialize
+ *
+ * Called just after data structures for each port are
+ * initialized. Allocates space for PRD table if the device
+ * is DMA capable SFF.
+ *
+ * May be used as the port_start() entry in ata_port_operations for
+ * devices that are capable of 32bit PIO.
+ *
+ * LOCKING:
+ * Inherited from caller.
+ */
+int ata_sff_port_start32(struct ata_port *ap)
+{
+ ap->pflags |= ATA_PFLAG_PIO32 | ATA_PFLAG_PIO32CHANGE;
+ if (ap->ioaddr.bmdma_addr)
+ return ata_port_start(ap);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ata_sff_port_start32);
+
+/**
* ata_sff_std_ports - initialize ioaddr with standard port offsets.
* @ioaddr: IO address structure to be initialized
*
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