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mac_scsi: fix mac_scsi on some powerbooks 

Fix the mac_scsi interrupt edge trigger on non-RBV PowerBooks. This doesn't appear to help my PowerBook 520 but the NetBSD source reveals that the PowerBook 500 series is different than the others.

Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Finn Thain 2011-10-24 01:11:21 +11:00 committed by Geert Uytterhoeven
parent 4107c459fe
commit aa8a9fbe18
1 changed files with 20 additions and 14 deletions
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34
arch/m68k/mac/via.c
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@ -253,22 +253,28 @@ void __init via_init(void)
via2[vACR] &= ~0x03; /* disable port A & B latches */
}
/* Everything below this point is VIA2 only... */
if (rbv_present)
return;
/*
* Set vPCR for control line interrupts (but not on RBV)
* Set vPCR for control line interrupts.
*
* CA1 (SLOTS IRQ), CB1 (ASC IRQ): negative edge trigger.
*
* Macs with ESP SCSI have a negative edge triggered SCSI interrupt.
* Testing reveals that PowerBooks do too. However, the SE/30
* schematic diagram shows an active high NCR5380 IRQ line.
*/
if (!rbv_present) {
/* For all VIA types, CA1 (SLOTS IRQ) and CB1 (ASC IRQ)
* are made negative edge triggered here.
*/
if (macintosh_config->scsi_type == MAC_SCSI_OLD) {
/* CB2 (IRQ) indep. input, positive edge */
/* CA2 (DRQ) indep. input, positive edge */
via2[vPCR] = 0x66;
} else {
/* CB2 (IRQ) indep. input, negative edge */
/* CA2 (DRQ) indep. input, negative edge */
via2[vPCR] = 0x22;
}
pr_debug("VIA2 vPCR is 0x%02X\n", via2[vPCR]);
if (macintosh_config->via_type == MAC_VIA_II) {
/* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, pos. edge */
via2[vPCR] = 0x66;
} else {
/* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, neg. edge */
via2[vPCR] = 0x22;
}
}