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authorFinn Thain <fthain@telegraphics.com.au>2016-01-03 16:05:25 +1100
committerMartin K. Petersen <martin.petersen@oracle.com>2016-01-06 21:42:56 -0500
commitff3d4578840fd96a50558edf02ca0178b9ebb652 (patch)
tree4ee34f3341f2eb092e95cc0bb728865675939423 /drivers/scsi/dtc.c
parent1d3db59d59861481349437231c263b6c7a0eef78 (diff)
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ncr5380: Implement NCR5380_dma_xfer_len and remove LIMIT_TRANSFERSIZE macro
Follow the example of the atari_NCR5380.c core driver and adopt the NCR5380_dma_xfer_len() hook. Implement NCR5380_dma_xfer_len() for dtc.c and g_NCR5380.c to take care of the limitations of these cards. Keep the default for drivers using PSEUDO_DMA. Eliminate the unused macro LIMIT_TRANSFERSIZE. Signed-off-by: Finn Thain <fthain@telegraphics.com.au> Reviewed-by: Hannes Reinecke <hare@suse.com> Tested-by: Ondrej Zary <linux@rainbow-software.org> Tested-by: Michael Schmitz <schmitzmic@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/dtc.c')
-rw-r--r--drivers/scsi/dtc.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/scsi/dtc.c b/drivers/scsi/dtc.c
index bc856c8ba0dd..010d9b13aae7 100644
--- a/drivers/scsi/dtc.c
+++ b/drivers/scsi/dtc.c
@@ -419,6 +419,20 @@ static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src,
return (0);
}
+static int dtc_dma_xfer_len(struct scsi_cmnd *cmd)
+{
+ int transfersize = cmd->transfersize;
+
+ /* Limit transfers to 32K, for xx400 & xx406
+ * pseudoDMA that transfers in 128 bytes blocks.
+ */
+ if (transfersize > 32 * 1024 && cmd->SCp.this_residual &&
+ !(cmd->SCp.this_residual % transfersize))
+ transfersize = 32 * 1024;
+
+ return transfersize;
+}
+
MODULE_LICENSE("GPL");
#include "NCR5380.c"