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scsi: ncr5380: Expedite register polling 

Avoid the call to NCR5380_poll_politely2() when possible. The call is
easily short-circuited on the PIO fast path, using the inline wrapper.
This requires that the NCR5380_read macro be made available before
any #include "NCR5380.h" so a few declarations have to be moved too.

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>
This commit is contained in:
Finn Thain 2016-10-10 00:46:53 -04:00 committed by Martin K. Petersen
parent d5d37a0ab1
commit 7c60663143
3 changed files with 10 additions and 3 deletions
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3
drivers/scsi/NCR5380.h
View File

@ -310,6 +310,9 @@ static inline int NCR5380_poll_politely(struct NCR5380_hostdata *hostdata,
unsigned int reg, u8 bit, u8 val,
unsigned long wait)
{
if ((NCR5380_read(reg) & bit) == val)
return 0;
return NCR5380_poll_politely2(hostdata, reg, bit, val,
reg, bit, val, wait);
}

4
drivers/scsi/arm/cumana_1.c
View File

@ -29,6 +29,10 @@
#define NCR5380_implementation_fields \
unsigned ctrl
struct NCR5380_hostdata;
static u8 cumanascsi_read(struct NCR5380_hostdata *, unsigned int);
static void cumanascsi_write(struct NCR5380_hostdata *, unsigned int, u8);
#include "../NCR5380.h"
#define CTRL 0x16fc

6
drivers/scsi/atari_scsi.c
View File

@ -57,6 +57,9 @@
#define NCR5380_implementation_fields /* none */
static u8 (*atari_scsi_reg_read)(unsigned int);
static void (*atari_scsi_reg_write)(unsigned int, u8);
#define NCR5380_read(reg) atari_scsi_reg_read(reg)
#define NCR5380_write(reg, value) atari_scsi_reg_write(reg, value)
@ -126,9 +129,6 @@ static inline unsigned long SCSI_DMA_GETADR(void)
static void atari_scsi_fetch_restbytes(void);
static u8 (*atari_scsi_reg_read)(unsigned int);
static void (*atari_scsi_reg_write)(unsigned int, u8);
static unsigned long atari_dma_residual, atari_dma_startaddr;
static short atari_dma_active;
/* pointer to the dribble buffer */