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/* $OpenBSD: cia_pci.c,v 1.8 2001/11/06 19:53:13 miod Exp $ */
/* $NetBSD: cia_pci.c,v 1.25 2000/06/29 08:58:46 mrg Exp $ */
/*
* Copyright (c) 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <uvm/uvm_extern.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <alpha/pci/ciareg.h>
#include <alpha/pci/ciavar.h>
void cia_attach_hook __P((struct device *, struct device *,
struct pcibus_attach_args *));
int cia_bus_maxdevs __P((void *, int));
pcitag_t cia_make_tag __P((void *, int, int, int));
void cia_decompose_tag __P((void *, pcitag_t, int *, int *,
int *));
pcireg_t cia_conf_read __P((void *, pcitag_t, int));
void cia_conf_write __P((void *, pcitag_t, int, pcireg_t));
void
cia_pci_init(pc, v)
pci_chipset_tag_t pc;
void *v;
{
pc->pc_conf_v = v;
pc->pc_attach_hook = cia_attach_hook;
pc->pc_bus_maxdevs = cia_bus_maxdevs;
pc->pc_make_tag = cia_make_tag;
pc->pc_decompose_tag = cia_decompose_tag;
pc->pc_conf_read = cia_conf_read;
pc->pc_conf_write = cia_conf_write;
}
void
cia_attach_hook(parent, self, pba)
struct device *parent, *self;
struct pcibus_attach_args *pba;
{
}
int
cia_bus_maxdevs(cpv, busno)
void *cpv;
int busno;
{
return 32;
}
pcitag_t
cia_make_tag(cpv, b, d, f)
void *cpv;
int b, d, f;
{
return (b << 16) | (d << 11) | (f << 8);
}
void
cia_decompose_tag(cpv, tag, bp, dp, fp)
void *cpv;
pcitag_t tag;
int *bp, *dp, *fp;
{
if (bp != NULL)
*bp = (tag >> 16) & 0xff;
if (dp != NULL)
*dp = (tag >> 11) & 0x1f;
if (fp != NULL)
*fp = (tag >> 8) & 0x7;
}
pcireg_t
cia_conf_read(cpv, tag, offset)
void *cpv;
pcitag_t tag;
int offset;
{
struct cia_config *ccp = cpv;
pcireg_t *datap, data;
int s, secondary, ba;
u_int32_t old_cfg, errbits;
#ifdef __GNUC__
s = 0; /* XXX gcc -Wuninitialized */
old_cfg = 0; /* XXX gcc -Wuninitialized */
#endif
/*
* Some (apparently-common) revisions of EB164 and AlphaStation
* firmware do the Wrong thing with PCI master and target aborts,
* which are caused by accesing the configuration space of devices
* that don't exist (for example).
*
* To work around this, we clear the CIA error register's PCI
* master and target abort bits before touching PCI configuration
* space and check it afterwards. If it indicates a master or target
* abort, the device wasn't there so we return 0xffffffff.
*/
REGVAL(CIA_CSR_CIA_ERR) = CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT;
alpha_mb();
alpha_pal_draina();
/* secondary if bus # != 0 */
alpha_pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0);
if (secondary) {
s = splhigh();
old_cfg = REGVAL(CIA_CSR_CFG);
alpha_mb();
REGVAL(CIA_CSR_CFG) = old_cfg | 0x1;
alpha_mb();
}
/*
* We just inline the BWX support, since this is the only
* difference between BWX and swiz for config space.
*/
if (ccp->cc_flags & CCF_PCI_USE_BWX) {
if (secondary) {
datap =
(pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 |
tag | (offset & ~0x03));
} else {
datap =
(pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 |
tag | (offset & ~0x03));
}
} else {
datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF |
tag << 5UL | /* XXX */
(offset & ~0x03) << 5 | /* XXX */
0 << 5 | /* XXX */
0x3 << 3); /* XXX */
}
data = (pcireg_t)-1;
alpha_mb();
if (!(ba = badaddr(datap, sizeof *datap)))
data = *datap;
alpha_mb();
alpha_mb();
if (secondary) {
alpha_mb();
REGVAL(CIA_CSR_CFG) = old_cfg;
alpha_mb();
splx(s);
}
alpha_pal_draina();
alpha_mb();
errbits = REGVAL(CIA_CSR_CIA_ERR);
if (errbits & (CIA_ERR_RCVD_MAS_ABT|CIA_ERR_RCVD_TAR_ABT)) {
ba = 1;
data = 0xffffffff;
}
if (errbits) {
REGVAL(CIA_CSR_CIA_ERR) = errbits;
alpha_mb();
alpha_pal_draina();
}
#if 0
printf("cia_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg,
data, datap, ba ? " (badaddr)" : "");
#endif
return data;
}
void
cia_conf_write(cpv, tag, offset, data)
void *cpv;
pcitag_t tag;
int offset;
pcireg_t data;
{
struct cia_config *ccp = cpv;
pcireg_t *datap;
int s, secondary;
u_int32_t old_cfg;
#ifdef __GNUC__
s = 0; /* XXX gcc -Wuninitialized */
old_cfg = 0; /* XXX gcc -Wuninitialized */
#endif
/* secondary if bus # != 0 */
alpha_pci_decompose_tag(&ccp->cc_pc, tag, &secondary, 0, 0);
if (secondary) {
s = splhigh();
old_cfg = REGVAL(CIA_CSR_CFG);
alpha_mb();
REGVAL(CIA_CSR_CFG) = old_cfg | 0x1;
alpha_mb();
}
/*
* We just inline the BWX support, since this is the only
* difference between BWX and swiz for config space.
*/
if (ccp->cc_flags & CCF_PCI_USE_BWX) {
if (secondary) {
datap =
(pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF1 |
tag | (offset & ~0x03));
} else {
datap =
(pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_EV56_BWCONF0 |
tag | (offset & ~0x03));
}
} else {
datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(CIA_PCI_CONF |
tag << 5UL | /* XXX */
(offset & ~0x03) << 5 | /* XXX */
0 << 5 | /* XXX */
0x3 << 3); /* XXX */
}
alpha_mb();
*datap = data;
alpha_mb();
alpha_mb();
if (secondary) {
alpha_mb();
REGVAL(CIA_CSR_CFG) = old_cfg;
alpha_mb();
splx(s);
}
#if 0
printf("cia_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag,
reg, data, datap);
#endif
}
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