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[SCSI] Allow nvram settings to determine bus mode

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The PDC code can set the bus mode, but we were ignoring that setting.
Also move the code that determines bus mode into its own function.

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Matthew Wilcox 2006-03-28 11:03:44 -05:00 committed by James Bottomley
parent 92d578b94c
commit c2349df918
1 changed files with 34 additions and 31 deletions
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65
drivers/scsi/sym53c8xx_2/sym_hipd.c
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@ -647,6 +647,37 @@ static void sym_save_initial_setting (struct sym_hcb *np)
np->sv_ctest5 = INB(np, nc_ctest5) & 0x24;
}
/*
* Set SCSI BUS mode.
* - LVD capable chips (895/895A/896/1010) report the current BUS mode
* through the STEST4 IO register.
* - For previous generation chips (825/825A/875), the user has to tell us
* how to check against HVD, since a 100% safe algorithm is not possible.
*/
static void sym_set_bus_mode(struct sym_hcb *np, struct sym_nvram *nvram)
{
if (np->scsi_mode)
return;
np->scsi_mode = SMODE_SE;
if (np->features & (FE_ULTRA2|FE_ULTRA3))
np->scsi_mode = (np->sv_stest4 & SMODE);
else if (np->features & FE_DIFF) {
if (SYM_SETUP_SCSI_DIFF == 1) {
if (np->sv_scntl3) {
if (np->sv_stest2 & 0x20)
np->scsi_mode = SMODE_HVD;
} else if (nvram->type == SYM_SYMBIOS_NVRAM) {
if (!(INB(np, nc_gpreg) & 0x08))
np->scsi_mode = SMODE_HVD;
}
} else if (SYM_SETUP_SCSI_DIFF == 2)
np->scsi_mode = SMODE_HVD;
}
if (np->scsi_mode == SMODE_HVD)
np->rv_stest2 |= 0x20;
}
/*
* Prepare io register values used by sym_start_up()
* according to selected and supported features.
@ -657,10 +688,7 @@ static int sym_prepare_setting(struct Scsi_Host *shost, struct sym_hcb *np, stru
u32 period;
int i;
/*
* Wide ?
*/
np->maxwide = (np->features & FE_WIDE)? 1 : 0;
np->maxwide = (np->features & FE_WIDE) ? 1 : 0;
/*
* Guess the frequency of the chip's clock.
@ -841,6 +869,7 @@ static int sym_prepare_setting(struct Scsi_Host *shost, struct sym_hcb *np, stru
* Get parity checking, host ID and verbose mode from NVRAM
*/
np->myaddr = 255;
np->scsi_mode = 0;
sym_nvram_setup_host(shost, np, nvram);
/*
@ -857,33 +886,7 @@ static int sym_prepare_setting(struct Scsi_Host *shost, struct sym_hcb *np, stru
*/
sym_init_burst(np, burst_max);
/*
* Set SCSI BUS mode.
* - LVD capable chips (895/895A/896/1010) report the
* current BUS mode through the STEST4 IO register.
* - For previous generation chips (825/825A/875),
* user has to tell us how to check against HVD,
* since a 100% safe algorithm is not possible.
*/
np->scsi_mode = SMODE_SE;
if (np->features & (FE_ULTRA2|FE_ULTRA3))
np->scsi_mode = (np->sv_stest4 & SMODE);
else if (np->features & FE_DIFF) {
if (SYM_SETUP_SCSI_DIFF == 1) {
if (np->sv_scntl3) {
if (np->sv_stest2 & 0x20)
np->scsi_mode = SMODE_HVD;
}
else if (nvram->type == SYM_SYMBIOS_NVRAM) {
if (!(INB(np, nc_gpreg) & 0x08))
np->scsi_mode = SMODE_HVD;
}
}
else if (SYM_SETUP_SCSI_DIFF == 2)
np->scsi_mode = SMODE_HVD;
}
if (np->scsi_mode == SMODE_HVD)
np->rv_stest2 |= 0x20;
sym_set_bus_mode(np, nvram);
/*
* Set LED support from SCRIPTS.