/* $NetBSD: cia_pci.c,v 1.36 2021/09/11 21:30:46 andvar 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
[email protected]
* 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/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: cia_pci.c,v 1.36 2021/09/11 21:30:46 andvar Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <alpha/pci/ciareg.h>
#include <alpha/pci/ciavar.h>
static pcireg_t cia_conf_read(void *, pcitag_t, int);
static void cia_conf_write(void *, pcitag_t, int, pcireg_t);
void
cia_pci_init(pci_chipset_tag_t pc, void *v)
{
pc->pc_conf_v = v;
pc->pc_conf_read = cia_conf_read;
pc->pc_conf_write = cia_conf_write;
}
static pcireg_t
cia_conf_read(void *cpv, pcitag_t tag, int offset)
{
struct cia_config *ccp = cpv;
pcireg_t *datap, data;
int s, secondary, ba;
uint32_t old_cfg, errbits;
if ((unsigned int)offset >= PCI_CONF_SIZE)
return (pcireg_t) -1;
#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 accessing 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 */
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;
}
static void
cia_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
{
struct cia_config *ccp = cpv;
pcireg_t *datap;
int s, secondary;
uint32_t old_cfg;
if ((unsigned int)offset >= PCI_CONF_SIZE)
return;
#ifdef __GNUC__
s = 0; /* XXX gcc -Wuninitialized */
old_cfg = 0; /* XXX gcc -Wuninitialized */
#endif
/* secondary if bus # != 0 */
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
}
