From f67a9c1592b3a0292376bdcbdcc34cbe353967a8 Mon Sep 17 00:00:00 2001 From: Thomas Bogendoerfer Date: Mon, 25 Dec 2006 21:30:08 +0100 Subject: [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 --- drivers/scsi/53c700.c | 24 +++++++++++++++++++++--- drivers/scsi/53c700.h | 2 +- drivers/scsi/lasi700.c | 1 + drivers/scsi/sim710.c | 1 + 4 files changed, 24 insertions(+), 4 deletions(-) (limited to 'drivers') diff --git a/drivers/scsi/53c700.c b/drivers/scsi/53c700.c index 68103e508db..88e061d13d0 100644 --- a/drivers/scsi/53c700.c +++ b/drivers/scsi/53c700.c @@ -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); diff --git a/drivers/scsi/53c700.h b/drivers/scsi/53c700.h index f38822db421..841e1bb27d5 100644 --- a/drivers/scsi/53c700.h +++ b/drivers/scsi/53c700.h @@ -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 diff --git a/drivers/scsi/lasi700.c b/drivers/scsi/lasi700.c index f0871c3ac3d..2aae1b081fc 100644 --- a/drivers/scsi/lasi700.c +++ b/drivers/scsi/lasi700.c @@ -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); diff --git a/drivers/scsi/sim710.c b/drivers/scsi/sim710.c index 551baccec52..018c65f73ac 100644 --- a/drivers/scsi/sim710.c +++ b/drivers/scsi/sim710.c @@ -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)) -- cgit v1.2.3