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Commit c0489e4e authored by Tejun Heo's avatar Tejun Heo Committed by Jeff Garzik
Browse files

[PATCH] libata: implement ata_unpack_xfermask() 



Implement ata_unpack_xfermask().

Signed-off-by: default avatarTejun Heo <htejun@gmail.com>
Signed-off-by: default avatarJeff Garzik <jeff@garzik.org>
parent 2cc432ee

drivers/scsi/libata-core.c

+23 −0
Original line number Diff line number Diff line
@@ -252,6 +252,29 @@ static unsigned int ata_pack_xfermask(unsigned int pio_mask, 
		((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;