[PATCH] libata: implement ata_unpack_xfermask()
Implement ata_unpack_xfermask().
Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index f3c115b..1514cb5 100644
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -252,6 +252,29 @@
((udma_mask << ATA_SHIFT_UDMA) & ATA_MASK_UDMA);
}
+/**
+ * ata_unpack_xfermask - Unpack xfer_mask into pio, mwdma and udma masks
+ * @xfer_mask: xfer_mask to unpack
+ * @pio_mask: resulting pio_mask
+ * @mwdma_mask: resulting mwdma_mask
+ * @udma_mask: resulting udma_mask
+ *
+ * Unpack @xfer_mask into @pio_mask, @mwdma_mask and @udma_mask.
+ * Any NULL distination masks will be ignored.
+ */
+static void ata_unpack_xfermask(unsigned int xfer_mask,
+ unsigned int *pio_mask,
+ unsigned int *mwdma_mask,
+ unsigned int *udma_mask)
+{
+ if (pio_mask)
+ *pio_mask = (xfer_mask & ATA_MASK_PIO) >> ATA_SHIFT_PIO;
+ if (mwdma_mask)
+ *mwdma_mask = (xfer_mask & ATA_MASK_MWDMA) >> ATA_SHIFT_MWDMA;
+ if (udma_mask)
+ *udma_mask = (xfer_mask & ATA_MASK_UDMA) >> ATA_SHIFT_UDMA;
+}
+
static const struct ata_xfer_ent {
unsigned int shift, bits;
u8 base;