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- Egads! There are Pyxis "Pass 1" chips that do not have the DMA bug!

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Use the check recommended by the Digital Workstation engineers; look
  for Miata 1 systems (i.e. with Intel SIO).  From Andrew Gallatin.
- Update copyright (Pyxis and BWX).
This commit is contained in:
thorpej 1998-06-05 19:25:19 +00:00
parent f251e3372d
commit bf8523f4e4
1 changed files with 51 additions and 4 deletions
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55
sys/arch/alpha/pci/cia.c
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@ -1,4 +1,41 @@
/* $NetBSD: cia.c,v 1.41 1998/06/05 17:24:11 thorpej Exp $ */
/* $NetBSD: cia.c,v 1.42 1998/06/05 19:25:19 thorpej Exp $ */
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
* NASA Ames Research Center.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
@ -33,7 +70,7 @@
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: cia.c,v 1.41 1998/06/05 17:24:11 thorpej Exp $");
__KERNEL_RCSID(0, "$NetBSD: cia.c,v 1.42 1998/06/05 19:25:19 thorpej Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -220,14 +257,23 @@ ciaattach(parent, self, aux)
self->dv_xname);
#endif
if ((ccp->cc_flags & CCF_ISPYXIS) != 0 && ccp->cc_rev < 1) {
#ifdef DEC_550
if (hwrpb->rpb_type == ST_DEC_550 &&
(hwrpb->rpb_variation & SV_ST_MASK) < SV_ST_MIATA_1_5) {
/*
* Pass 1 Pyxis chips have a bug: DMA cannot cross
* Miata 1 systems have a bug: DMA cannot cross
* an 8k boundary! Make sure PCI read prefetching
* is disabled on these chips. Note that secondary
* PCI busses don't have this problem, because of
* the way PPBs handle PCI read requests.
*
* In the 21174 Technical Reference Manual, this is
* actually documented as "Pyxis Pass 1", but apparently
* there are chips that report themselves as "Pass 1"
* which do not have the bug! Miatas with the Cypress
* PCI-ISA bridge (i.e. Miata 1.5 and Miata 2) do not
* have the bug, so we use this check.
*
* XXX We also need to deal with this boundary constraint
* XXX in the PCI bus 0 (and ISA) DMA tags, but some
* XXX drivers are going to need to be changed first.
@ -244,6 +290,7 @@ ciaattach(parent, self, aux)
REGVAL(CIA_CSR_CTRL) = ctrl;
alpha_mb();
}
#endif /* DEC_550 */
switch (hwrpb->rpb_type) {
#ifdef DEC_KN20AA