diff options
| author | Finn Thain <fthain@telegraphics.com.au> | 2016-01-03 06:05:25 +0100 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2016-01-07 03:42:56 +0100 |
| commit | ff3d4578840fd96a50558edf02ca0178b9ebb652 (patch) | |
| tree | 4ee34f3341f2eb092e95cc0bb728865675939423 /drivers/scsi/g_NCR5380.c | |
| parent | ncr5380: Always retry arbitration and selection (diff) | |
| download | linux-ff3d4578840fd96a50558edf02ca0178b9ebb652.tar.xz linux-ff3d4578840fd96a50558edf02ca0178b9ebb652.zip | |
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.c | 15 |
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 */ /* |