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authorFinn Thain <fthain@telegraphics.com.au>2016-01-03 08:05:25 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2016-01-07 05:42:56 +0300
commitff3d4578840fd96a50558edf02ca0178b9ebb652 (patch)
tree4ee34f3341f2eb092e95cc0bb728865675939423 /drivers/scsi/g_NCR5380.c
parent1d3db59d59861481349437231c263b6c7a0eef78 (diff)
downloadlinux-ff3d4578840fd96a50558edf02ca0178b9ebb652.tar.xz
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/g_NCR5380.c')
-rw-r--r--drivers/scsi/g_NCR5380.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
index afd092ff0c2e..5b3e03ad50ce 100644
--- a/drivers/scsi/g_NCR5380.c
+++ b/drivers/scsi/g_NCR5380.c
@@ -699,6 +699,21 @@ static inline int NCR5380_pwrite(struct Scsi_Host *instance, unsigned char *src,
; // TIMEOUT
return 0;
}
+
+static int generic_NCR5380_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;
+}
+
#endif /* PSEUDO_DMA */
/*