On Wed, 9 Dec 2015, Ondrej Zary wrote:
On Tuesday 08 December 2015 03:05:11 Finn Thain wrote:
On Sun, 6 Dec 2015, Ondrej Zary wrote:
Add I/O register mapping for NCR53C400A and enable PDMA mode to
improve performance and fix non-working IRQ.
Tested with HP C2502 (and user-space enabler).
Signed-off-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>
---
drivers/scsi/g_NCR5380.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/g_NCR5380.c b/drivers/scsi/g_NCR5380.c
index 86740fd..099fdac 100644
--- a/drivers/scsi/g_NCR5380.c
+++ b/drivers/scsi/g_NCR5380.c
@@ -324,7 +324,7 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
#endif
break;
case BOARD_NCR53C400A:
- flags = FLAG_NO_PSEUDO_DMA;
+ flags = FLAG_NO_DMA_FIXUP;
ports = ncr_53c400a_ports;
break;
case BOARD_DTC3181E:
@@ -406,11 +406,18 @@ static int __init generic_NCR5380_detect(struct scsi_host_template *tpnt)
* On NCR53C400 boards, NCR5380 registers are mapped 8 past
* the base address.
*/
- if (overrides[current_override].board == BOARD_NCR53C400) {
+ switch (overrides[current_override].board) {
+ case BOARD_NCR53C400:
instance->io_port += 8;
hostdata->c400_ctl_status = 0;
hostdata->c400_blk_cnt = 1;
hostdata->c400_host_buf = 4;
+ break;
+ case BOARD_NCR53C400A:
+ hostdata->c400_ctl_status = 9;
+ hostdata->c400_blk_cnt = 10;
+ hostdata->c400_host_buf = 8;
+ break;
}
#else
instance->base = overrides[current_override].NCR5380_map_name;
For SCSI_G_NCR5380_MEM and BOARD_NCR53C400A (or BOARD_DTC3181E), you have
not assigned c400_ctl_status, c400_blk_cnt and c400_host_buf. Perhaps we
should throw an error, something like this?
hostdata->iomem = iomem;
- if (overrides[current_override].board == BOARD_NCR53C400) {
+ switch (overrides[current_override].board) {
+ case BOARD_NCR53C400:
hostdata->c400_ctl_status = 0x100;
hostdata->c400_blk_cnt = 0x101;
hostdata->c400_host_buf = 0x104;
+ break;
+ case BOARD_NCR53C400A:
+ pr_err(DRV_MODULE_NAME ": unknown register offsets\n");
+ goto out_unregister;
}
#endif
We don't need to fail, just disable PDMA by setting:
flags = FLAG_NO_PSEUDO_DMA;
And BTW. this:
if (overrides[current_override].board == BOARD_NCR53C400 ||
overrides[current_override].board == BOARD_NCR53C400A)
NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
should then be, solving the problem of growing if condition:
if (!(flags & FLAG_NO_PSEUDO_DMA))
NCR5380_write(hostdata->c400_ctl_status, CSR_BASE);
We already resolved that problem. Julian Calaby and I agreed that a switch
statement is better than a flag here.
Moreover, if the user sets the 'ncr_53c400' or 'ncr_53c400a' module
options I presume they expect corresponding device initialization. I don't
think PIO means we should skip that.
Passing 'ncr_53c400' or 'ncr_53c400a' options to the g_NCR5380_mmio module
has to give an error if we don't have enough information about the board
to allow us to do the right thing.
(Passing the 'ncr_5380' module param may give the result you wanted.)
BTW, I fixed up this patch when I added it to my queue. I'll send you my
version to test.
Thanks.
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