266 lines
6.2 KiB
C
266 lines
6.2 KiB
C
/* $NetBSD: cia_pci.c,v 1.23 1998/07/29 01:28:44 thorpej Exp $ */
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/*
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* Copyright (c) 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: cia_pci.c,v 1.23 1998/07/29 01:28:44 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/device.h>
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#include <vm/vm.h>
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#include <dev/pci/pcireg.h>
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#include <dev/pci/pcivar.h>
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#include <alpha/pci/ciareg.h>
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#include <alpha/pci/ciavar.h>
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void cia_attach_hook __P((struct device *, struct device *,
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struct pcibus_attach_args *));
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int cia_bus_maxdevs __P((void *, int));
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pcitag_t cia_make_tag __P((void *, int, int, int));
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void cia_decompose_tag __P((void *, pcitag_t, int *, int *,
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int *));
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pcireg_t cia_conf_read __P((void *, pcitag_t, int));
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void cia_conf_write __P((void *, pcitag_t, int, pcireg_t));
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void
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cia_pci_init(pc, v)
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pci_chipset_tag_t pc;
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void *v;
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{
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pc->pc_conf_v = v;
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pc->pc_attach_hook = cia_attach_hook;
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pc->pc_bus_maxdevs = cia_bus_maxdevs;
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pc->pc_make_tag = cia_make_tag;
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pc->pc_decompose_tag = cia_decompose_tag;
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pc->pc_conf_read = cia_conf_read;
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pc->pc_conf_write = cia_conf_write;
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}
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void
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cia_attach_hook(parent, self, pba)
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struct device *parent, *self;
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struct pcibus_attach_args *pba;
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{
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}
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int
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cia_bus_maxdevs(cpv, busno)
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void *cpv;
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int busno;
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{
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return 32;
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}
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pcitag_t
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cia_make_tag(cpv, b, d, f)
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void *cpv;
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int b, d, f;
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{
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return (b << 16) | (d << 11) | (f << 8);
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}
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void
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cia_decompose_tag(cpv, tag, bp, dp, fp)
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void *cpv;
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pcitag_t tag;
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int *bp, *dp, *fp;
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{
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if (bp != NULL)
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*bp = (tag >> 16) & 0xff;
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if (dp != NULL)
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*dp = (tag >> 11) & 0x1f;
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if (fp != NULL)
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*fp = (tag >> 8) & 0x7;
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}
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pcireg_t
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cia_conf_read(cpv, tag, offset)
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void *cpv;
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pcitag_t tag;
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int offset;
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{
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struct cia_config *ccp = cpv;
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pcireg_t *datap, data;
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int s, secondary, ba;
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u_int32_t old_cfg, errbits;
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#ifdef __GNUC__
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s = 0; /* XXX gcc -Wuninitialized */
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old_cfg = 0; /* XXX gcc -Wuninitialized */
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#endif
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/*
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* Some (apparently-common) revisions of EB164 and AlphaStation
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* firmware do the Wrong thing with PCI master and target aborts,
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* which are caused by accesing the configuration space of devices
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* that don't exist (for example).
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*
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* To work around this, we clear the CIA error register's PCI
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* master and target abort bits before touching PCI configuration
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* space and check it afterwards. If it indicates a master or target
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* abort, the device wasn't there so we return 0xffffffff.
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*/
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REGVAL(CIA_CSR_CIA_ERR) = CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT;
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alpha_mb();
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alpha_pal_draina();
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/* secondary if bus # != 0 */
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alpha_pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0);
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if (secondary) {
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s = splhigh();
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old_cfg = REGVAL(CIA_CSR_CFG);
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alpha_mb();
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REGVAL(CIA_CSR_CFG) = old_cfg | 0x1;
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alpha_mb();
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}
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/*
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* We just inline the BWX support, since this is the only
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* difference between BWX and swiz for config space.
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*/
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if (ccp->cc_flags & CCF_PCI_USE_BWX) {
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if (secondary) {
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datap =
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(pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 |
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tag | (offset & ~0x03));
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} else {
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datap =
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(pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 |
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tag | (offset & ~0x03));
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}
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} else {
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datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF |
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tag << 5UL | /* XXX */
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(offset & ~0x03) << 5 | /* XXX */
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0 << 5 | /* XXX */
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0x3 << 3); /* XXX */
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}
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data = (pcireg_t)-1;
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if (!(ba = badaddr(datap, sizeof *datap)))
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data = *datap;
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if (secondary) {
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alpha_mb();
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REGVAL(CIA_CSR_CFG) = old_cfg;
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alpha_mb();
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splx(s);
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}
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alpha_pal_draina();
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alpha_mb();
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errbits = REGVAL(CIA_CSR_CIA_ERR);
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if (errbits & (CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT)) {
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ba = 1;
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data = 0xffffffff;
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}
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if (errbits) {
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REGVAL(CIA_CSR_CIA_ERR) = errbits;
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alpha_mb();
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alpha_pal_draina();
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}
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#if 0
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printf("cia_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg,
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data, datap, ba ? " (badaddr)" : "");
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#endif
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return data;
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}
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void
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cia_conf_write(cpv, tag, offset, data)
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void *cpv;
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pcitag_t tag;
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int offset;
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pcireg_t data;
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{
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struct cia_config *ccp = cpv;
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pcireg_t *datap;
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int s, secondary;
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u_int32_t old_cfg;
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#ifdef __GNUC__
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s = 0; /* XXX gcc -Wuninitialized */
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old_cfg = 0; /* XXX gcc -Wuninitialized */
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#endif
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/* secondary if bus # != 0 */
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alpha_pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0);
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if (secondary) {
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s = splhigh();
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old_cfg = REGVAL(CIA_CSR_CFG);
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alpha_mb();
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REGVAL(CIA_CSR_CFG) = old_cfg | 0x1;
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alpha_mb();
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}
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/*
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* We just inline the BWX support, since this is the only
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* difference between BWX and swiz for config space.
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*/
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if (ccp->cc_flags & CCF_PCI_USE_BWX) {
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if (secondary) {
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datap =
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(pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 |
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tag | (offset & ~0x03));
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} else {
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datap =
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(pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 |
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tag | (offset & ~0x03));
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}
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} else {
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datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF |
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tag << 5UL | /* XXX */
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(offset & ~0x03) << 5 | /* XXX */
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0 << 5 | /* XXX */
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0x3 << 3); /* XXX */
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}
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*datap = data;
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if (secondary) {
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alpha_mb();
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REGVAL(CIA_CSR_CFG) = old_cfg;
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alpha_mb();
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splx(s);
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}
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#if 0
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printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag,
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reg, data, datap);
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#endif
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}
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