ncr5380: Replace redundant flags with FLAG_NO_DMA_FIXUP
The flags DMA_WORKS_RIGHT, FLAG_NCR53C400 and FLAG_HAS_LAST_BYTE_SENT
all mean the same thing, i.e. the chip is not a 538[01]. (More recent
devices such as the 53C80 have a 'Last Byte Sent' bit in the Target
Command Register as well as other fixes for End-of-DMA errata.)
These flags have no additional meanings since previous cleanup patches
eliminated the NCR53C400 macro, moved g_NCR5380-specific code out of the
core driver and standardized interrupt handling.
Use the FLAG_NO_DMA_FIXUP flag to suppress End-of-DMA errata workarounds,
for those cards and drivers that make use of the TCR_LAST_BYTE_SENT bit.
Remove the old flags.
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
diff --git a/drivers/scsi/NCR5380.c b/drivers/scsi/NCR5380.c
index 9c1b69b..29cf1ec 100644
--- a/drivers/scsi/NCR5380.c
+++ b/drivers/scsi/NCR5380.c
@@ -541,7 +541,7 @@
instance->base, instance->irq,
instance->can_queue, instance->cmd_per_lun,
instance->sg_tablesize, instance->this_id,
- hostdata->flags & FLAG_NCR53C400 ? "NCR53C400 " : "",
+ hostdata->flags & FLAG_NO_DMA_FIXUP ? "NO_DMA_FIXUP " : "",
hostdata->flags & FLAG_DTC3181E ? "DTC3181E " : "",
hostdata->flags & FLAG_NO_PSEUDO_DMA ? "NO_PSEUDO_DMA " : "",
hostdata->flags & FLAG_TOSHIBA_DELAY ? "TOSHIBA_DELAY " : "",
@@ -702,6 +702,7 @@
hostdata->connected = NULL;
hostdata->issue_queue = NULL;
hostdata->disconnected_queue = NULL;
+ hostdata->flags = flags;
INIT_WORK(&hostdata->main_task, NCR5380_main);
hostdata->work_q = alloc_workqueue("ncr5380_%d",
@@ -710,12 +711,6 @@
if (!hostdata->work_q)
return -ENOMEM;
- /* The CHECK code seems to break the 53C400. Will check it later maybe */
- if (flags & FLAG_NCR53C400)
- hostdata->flags = FLAG_HAS_LAST_BYTE_SENT | flags;
- else
- hostdata->flags = FLAG_CHECK_LAST_BYTE_SENT | flags;
-
hostdata->host = instance;
prepare_info(instance);
@@ -1614,7 +1609,7 @@
* before the setting of DMA mode to after transfer of the last byte.
*/
- if (hostdata->flags & FLAG_NCR53C400)
+ if (hostdata->flags & FLAG_NO_DMA_FIXUP)
NCR5380_write(MODE_REG, MR_BASE | MR_DMA_MODE | MR_MONITOR_BSY |
MR_ENABLE_EOP_INTR);
else
@@ -1734,14 +1729,9 @@
return 0;
#else /* defined(REAL_DMA_POLL) */
if (p & SR_IO) {
-#ifdef DMA_WORKS_RIGHT
- foo = NCR5380_pread(instance, d, c);
-#else
- int diff = 1;
- if (hostdata->flags & FLAG_NCR53C400) {
- diff = 0;
- }
- if (!(foo = NCR5380_pread(instance, d, c - diff))) {
+ foo = NCR5380_pread(instance, d,
+ hostdata->flags & FLAG_NO_DMA_FIXUP ? c : c - 1);
+ if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) {
/*
* We can't disable DMA mode after successfully transferring
* what we plan to be the last byte, since that would open up
@@ -1764,46 +1754,32 @@
* byte.
*/
- if (!(hostdata->flags & FLAG_NCR53C400)) {
- while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ));
- /* Wait for clean handshake */
- while (NCR5380_read(STATUS_REG) & SR_REQ);
- d[c - 1] = NCR5380_read(INPUT_DATA_REG);
+ if (NCR5380_poll_politely(instance, BUS_AND_STATUS_REG,
+ BASR_DRQ, BASR_DRQ, HZ) < 0) {
+ foo = -1;
+ shost_printk(KERN_ERR, instance, "PDMA read: DRQ timeout\n");
}
+ if (NCR5380_poll_politely(instance, STATUS_REG,
+ SR_REQ, 0, HZ) < 0) {
+ foo = -1;
+ shost_printk(KERN_ERR, instance, "PDMA read: !REQ timeout\n");
+ }
+ d[c - 1] = NCR5380_read(INPUT_DATA_REG);
}
-#endif
} else {
-#ifdef DMA_WORKS_RIGHT
foo = NCR5380_pwrite(instance, d, c);
-#else
- int timeout;
- dprintk(NDEBUG_C400_PWRITE, "About to pwrite %d bytes\n", c);
- if (!(foo = NCR5380_pwrite(instance, d, c))) {
+ if (!foo && !(hostdata->flags & FLAG_NO_DMA_FIXUP)) {
/*
* Wait for the last byte to be sent. If REQ is being asserted for
* the byte we're interested, we'll ACK it and it will go false.
*/
- if (!(hostdata->flags & FLAG_HAS_LAST_BYTE_SENT)) {
- timeout = 20000;
- while (!(NCR5380_read(BUS_AND_STATUS_REG) & BASR_DRQ) && (NCR5380_read(BUS_AND_STATUS_REG) & BASR_PHASE_MATCH));
-
- if (!timeout)
- dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : timed out on last byte\n", instance->host_no);
-
- if (hostdata->flags & FLAG_CHECK_LAST_BYTE_SENT) {
- hostdata->flags &= ~FLAG_CHECK_LAST_BYTE_SENT;
- if (NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT) {
- hostdata->flags |= FLAG_HAS_LAST_BYTE_SENT;
- dprintk(NDEBUG_LAST_BYTE_SENT, "scsi%d : last byte sent works\n", instance->host_no);
- }
- }
- } else {
- dprintk(NDEBUG_C400_PWRITE, "Waiting for LASTBYTE\n");
- while (!(NCR5380_read(TARGET_COMMAND_REG) & TCR_LAST_BYTE_SENT));
- dprintk(NDEBUG_C400_PWRITE, "Got LASTBYTE\n");
+ if (NCR5380_poll_politely2(instance,
+ BUS_AND_STATUS_REG, BASR_DRQ, BASR_DRQ,
+ BUS_AND_STATUS_REG, BASR_PHASE_MATCH, 0, HZ) < 0) {
+ foo = -1;
+ shost_printk(KERN_ERR, instance, "PDMA write: DRQ and phase timeout\n");
}
}
-#endif
}
NCR5380_write(MODE_REG, MR_BASE);
NCR5380_write(INITIATOR_COMMAND_REG, ICR_BASE);