[PATCH v2 24/72] ncr5380: Implement NCR5380_dma_xfer_len and remove LIMIT_TRANSFERSIZE macro

From: Finn Thain
Date: Sat Dec 05 2015 - 23:00:39 EST

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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@xxxxxxxxxxxxxxxxxxx>

---
drivers/scsi/NCR5380.c | 32 +++++---------------------------
drivers/scsi/arm/cumana_1.c | 3 +++
drivers/scsi/arm/oak.c | 2 ++
drivers/scsi/atari_NCR5380.c | 8 +++++---
drivers/scsi/dtc.c | 14 ++++++++++++++
drivers/scsi/dtc.h | 3 +++
drivers/scsi/g_NCR5380.c | 15 +++++++++++++++
drivers/scsi/g_NCR5380.h | 3 +++
drivers/scsi/mac_scsi.c | 1 +
drivers/scsi/pas16.h | 2 ++
drivers/scsi/t128.h | 2 ++
11 files changed, 55 insertions(+), 30 deletions(-)

Index: linux/drivers/scsi/NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/NCR5380.c 2015-12-06 12:30:00.000000000 +1100
+++ linux/drivers/scsi/NCR5380.c 2015-12-06 12:30:02.000000000 +1100
@@ -201,11 +201,6 @@
* DONT_USE_INTR - if defined, never use interrupts, even if we probe or
* override-configure an IRQ.
*
- * LIMIT_TRANSFERSIZE - if defined, limit the pseudo-dma transfers to 512
- * bytes at a time. Since interrupts are disabled by default during
- * these transfers, we might need this to give reasonable interrupt
- * service time if the transfer size gets too large.
- *
* LINKED - if defined, linked commands are supported.
*
* PSEUDO_DMA - if defined, PSEUDO DMA is used during the data transfer phases.
@@ -1995,29 +1990,12 @@ static void NCR5380_information_transfer
*/

#if defined(PSEUDO_DMA) || defined(REAL_DMA_POLL)
- /* KLL
- * PSEUDO_DMA is defined here. If this is the g_NCR5380
- * driver then it will always be defined, so the
- * FLAG_NO_PSEUDO_DMA is used to inhibit PDMA in the base
- * NCR5380 case. I think this is a fairly clean solution.
- * We supplement these 2 if's with the flag.
- */
-#ifdef NCR5380_dma_xfer_len
- if (!cmd->device->borken && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && (transfersize = NCR5380_dma_xfer_len(instance, cmd)) != 0) {
-#else
- transfersize = cmd->transfersize;
+ transfersize = 0;
+ if (!cmd->device->borken &&
+ !(hostdata->flags & FLAG_NO_PSEUDO_DMA))
+ transfersize = NCR5380_dma_xfer_len(instance, cmd, phase);

-#ifdef LIMIT_TRANSFERSIZE /* If we have problems with interrupt service */
- if (transfersize > 512)
- transfersize = 512;
-#endif /* LIMIT_TRANSFERSIZE */
-
- if (!cmd->device->borken && transfersize && !(hostdata->flags & FLAG_NO_PSEUDO_DMA) && cmd->SCp.this_residual && !(cmd->SCp.this_residual % transfersize)) {
- /* Limit transfers to 32K, for xx400 & xx406
- * pseudoDMA that transfers in 128 bytes blocks. */
- if (transfersize > 32 * 1024)
- transfersize = 32 * 1024;
-#endif
+ if (transfersize) {
len = transfersize;
if (NCR5380_transfer_dma(instance, &phase, &len, (unsigned char **) &cmd->SCp.ptr)) {
/*
Index: linux/drivers/scsi/atari_NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/atari_NCR5380.c 2015-12-06 12:30:00.000000000 +1100
+++ linux/drivers/scsi/atari_NCR5380.c 2015-12-06 12:30:02.000000000 +1100
@@ -2165,11 +2165,13 @@ static void NCR5380_information_transfer
*/

#if defined(REAL_DMA)
- if (
#if !defined(CONFIG_SUN3)
- !cmd->device->borken &&
+ transfersize = 0;
+ if (!cmd->device->borken)
#endif
- (transfersize = NCR5380_dma_xfer_len(instance, cmd, phase)) >= DMA_MIN_SIZE) {
+ transfersize = NCR5380_dma_xfer_len(instance, cmd, phase);
+
+ if (transfersize >= DMA_MIN_SIZE) {
len = transfersize;
cmd->SCp.phase = phase;
if (NCR5380_transfer_dma(instance, &phase,
Index: linux/drivers/scsi/dtc.c
===================================================================
--- linux.orig/drivers/scsi/dtc.c 2015-12-06 12:29:51.000000000 +1100
+++ linux/drivers/scsi/dtc.c 2015-12-06 12:30:02.000000000 +1100
@@ -419,6 +419,20 @@ static inline int NCR5380_pwrite(struct
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"
Index: linux/drivers/scsi/g_NCR5380.c
===================================================================
--- linux.orig/drivers/scsi/g_NCR5380.c 2015-12-06 12:29:51.000000000 +1100
+++ linux/drivers/scsi/g_NCR5380.c 2015-12-06 12:30:02.000000000 +1100
@@ -699,6 +699,21 @@ static inline int NCR5380_pwrite(struct
; // 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 */

/*
Index: linux/drivers/scsi/g_NCR5380.h
===================================================================
--- linux.orig/drivers/scsi/g_NCR5380.h 2015-12-06 12:29:33.000000000 +1100
+++ linux/drivers/scsi/g_NCR5380.h 2015-12-06 12:30:02.000000000 +1100
@@ -73,6 +73,9 @@

#endif

+#define NCR5380_dma_xfer_len(instance, cmd, phase) \
+ generic_NCR5380_dma_xfer_len(cmd)
+
#define NCR5380_intr generic_NCR5380_intr
#define NCR5380_queue_command generic_NCR5380_queue_command
#define NCR5380_abort generic_NCR5380_abort
Index: linux/drivers/scsi/dtc.h
===================================================================
--- linux.orig/drivers/scsi/dtc.h 2015-12-06 12:29:25.000000000 +1100
+++ linux/drivers/scsi/dtc.h 2015-12-06 12:30:02.000000000 +1100
@@ -27,6 +27,9 @@
#define NCR5380_read(reg) (readb(DTC_address(reg)))
#define NCR5380_write(reg, value) (writeb(value, DTC_address(reg)))

+#define NCR5380_dma_xfer_len(instance, cmd, phase) \
+ dtc_dma_xfer_len(cmd)
+
#define NCR5380_intr dtc_intr
#define NCR5380_queue_command dtc_queue_command
#define NCR5380_abort dtc_abort
Index: linux/drivers/scsi/arm/cumana_1.c
===================================================================
--- linux.orig/drivers/scsi/arm/cumana_1.c 2015-12-06 12:29:51.000000000 +1100
+++ linux/drivers/scsi/arm/cumana_1.c 2015-12-06 12:30:02.000000000 +1100
@@ -22,6 +22,9 @@
#define priv(host) ((struct NCR5380_hostdata *)(host)->hostdata)
#define NCR5380_read(reg) cumanascsi_read(instance, reg)
#define NCR5380_write(reg, value) cumanascsi_write(instance, reg, value)
+
+#define NCR5380_dma_xfer_len(instance, cmd, phase) (cmd->transfersize)
+
#define NCR5380_intr cumanascsi_intr
#define NCR5380_queue_command cumanascsi_queue_command
#define NCR5380_info cumanascsi_info
Index: linux/drivers/scsi/arm/oak.c
===================================================================
--- linux.orig/drivers/scsi/arm/oak.c 2015-12-06 12:29:51.000000000 +1100
+++ linux/drivers/scsi/arm/oak.c 2015-12-06 12:30:02.000000000 +1100
@@ -26,6 +26,8 @@
#define NCR5380_write(reg, value) \
writeb(value, priv(instance)->base + ((reg) << 2))

+#define NCR5380_dma_xfer_len(instance, cmd, phase) (cmd->transfersize)
+
#define NCR5380_queue_command oakscsi_queue_command
#define NCR5380_info oakscsi_info
#define NCR5380_show_info oakscsi_show_info
Index: linux/drivers/scsi/mac_scsi.c
===================================================================
--- linux.orig/drivers/scsi/mac_scsi.c 2015-12-06 12:29:51.000000000 +1100
+++ linux/drivers/scsi/mac_scsi.c 2015-12-06 12:30:02.000000000 +1100
@@ -38,6 +38,7 @@

#define NCR5380_pread macscsi_pread
#define NCR5380_pwrite macscsi_pwrite
+#define NCR5380_dma_xfer_len(instance, cmd, phase) (cmd->transfersize)

#define NCR5380_intr macscsi_intr
#define NCR5380_queue_command macscsi_queue_command
Index: linux/drivers/scsi/pas16.h
===================================================================
--- linux.orig/drivers/scsi/pas16.h 2015-12-06 12:29:25.000000000 +1100
+++ linux/drivers/scsi/pas16.h 2015-12-06 12:30:02.000000000 +1100
@@ -110,6 +110,8 @@
#define NCR5380_read(reg) ( inb(PAS16_io_port(reg)) )
#define NCR5380_write(reg, value) ( outb((value),PAS16_io_port(reg)) )

+#define NCR5380_dma_xfer_len(instance, cmd, phase) (cmd->transfersize)
+
#define NCR5380_intr pas16_intr
#define NCR5380_queue_command pas16_queue_command
#define NCR5380_abort pas16_abort
Index: linux/drivers/scsi/t128.h
===================================================================
--- linux.orig/drivers/scsi/t128.h 2015-12-06 12:29:25.000000000 +1100
+++ linux/drivers/scsi/t128.h 2015-12-06 12:30:02.000000000 +1100
@@ -84,6 +84,8 @@
#define NCR5380_read(reg) readb(T128_address(reg))
#define NCR5380_write(reg, value) writeb((value),(T128_address(reg)))

+#define NCR5380_dma_xfer_len(instance, cmd, phase) (cmd->transfersize)
+
#define NCR5380_intr t128_intr
#define NCR5380_queue_command t128_queue_command
#define NCR5380_abort t128_abort

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Next message: Finn Thain: "[PATCH v2 22/72] ncr5380: Eliminate selecting state"
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