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[SCSI] 53c700: Allow setting burst length

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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
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@ -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);