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[SCSI] 53c700: Allow setting burst length 

This is a patch, which allows not only disabling bursting but to specify
different burst lenghts. This feature is needed to get the 53c700 driver
working for the onboard SCSI controller of SNI RM machines, which only
work reliably with a 4 word burst length.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Thomas Bogendoerfer 2006-12-25 21:30:08 +01:00 committed by James Bottomley
parent a8b3485287
commit f67a9c1592
4 changed files with 24 additions and 4 deletions
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24
drivers/scsi/53c700.c
View File

@ -667,12 +667,30 @@ NCR_700_chip_setup(struct Scsi_Host *host)
__u8 min_xferp = (hostdata->chip710 ? NCR_710_MIN_XFERP : NCR_700_MIN_XFERP);
if(hostdata->chip710) {
__u8 burst_disable = hostdata->burst_disable
? BURST_DISABLE : 0;
__u8 burst_disable = 0;
__u8 burst_length = 0;
switch (hostdata->burst_length) {
case 1:
burst_length = BURST_LENGTH_1;
break;
case 2:
burst_length = BURST_LENGTH_2;
break;
case 4:
burst_length = BURST_LENGTH_4;
break;
case 8:
burst_length = BURST_LENGTH_8;
break;
default:
burst_disable = BURST_DISABLE;
break;
}
dcntl_extra = COMPAT_700_MODE;
NCR_700_writeb(dcntl_extra, host, DCNTL_REG);
NCR_700_writeb(BURST_LENGTH_8 | hostdata->dmode_extra,
NCR_700_writeb(burst_length | hostdata->dmode_extra,
host, DMODE_710_REG);
NCR_700_writeb(burst_disable | (hostdata->differential ?
DIFF : 0), host, CTEST7_REG);

2
drivers/scsi/53c700.h
View File

@ -203,7 +203,7 @@ struct NCR_700_Host_Parameters {
__u32 force_le_on_be:1;
#endif
__u32 chip710:1; /* set if really a 710 not 700 */
__u32 burst_disable:1; /* set to 1 to disable 710 bursting */
__u32 burst_length:4; /* set to 0 to disable 710 bursting */
/* NOTHING BELOW HERE NEEDS ALTERING */
__u32 fast:1; /* if we can alter the SCSI bus clock

1
drivers/scsi/lasi700.c
View File

@ -123,6 +123,7 @@ lasi700_probe(struct parisc_device *dev)
hostdata->force_le_on_be = 0;
hostdata->chip710 = 1;
hostdata->dmode_extra = DMODE_FC2;
hostdata->burst_length = 8;
}
host = NCR_700_detect(&lasi700_template, hostdata, &dev->dev);

1
drivers/scsi/sim710.c
View File

@ -123,6 +123,7 @@ sim710_probe_common(struct device *dev, unsigned long base_addr,
hostdata->differential = differential;
hostdata->clock = clock;
hostdata->chip710 = 1;
hostdata->burst_length = 8;
/* and register the chip */
if((host = NCR_700_detect(&sim710_driver_template, hostdata, dev))