/* $NetBSD: lca_pci.c,v 1.24 2021/06/25 03:52:41 thorpej 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: lca_pci.c,v 1.24 2021/06/25 03:52:41 thorpej 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/lcareg.h>
#include <alpha/pci/lcavar.h>
static int lca_bus_maxdevs(void *, int);
static pcireg_t lca_conf_read(void *, pcitag_t, int);
static void lca_conf_write(void *, pcitag_t, int, pcireg_t);
void
lca_pci_init(pci_chipset_tag_t pc, void *v)
{
pc->pc_conf_v = v;
pc->pc_bus_maxdevs = lca_bus_maxdevs;
pc->pc_conf_read = lca_conf_read;
pc->pc_conf_write = lca_conf_write;
}
static int
lca_bus_maxdevs(void *cpv, int busno)
{
/*
* We have to drive the IDSEL directly on bus 0, so we are
* limited to 16 devices there.
*/
return busno == 0 ? 16 : 32;
}
static paddr_t
lca_make_type0addr(int d, int f)
{
KASSERT(d < 16);
return PCI_CONF_TYPE0_IDSEL(d) | __SHIFTIN(f, PCI_CONF_TYPE0_FUNCTION);
}
static pcireg_t
lca_conf_read(void *cpv, pcitag_t tag, int offset)
{
struct lca_config *lcp = cpv;
pcireg_t *datap, data;
paddr_t confaddr;
int s, secondary, d, f, ba;
if ((unsigned int)offset >= PCI_CONF_SIZE)
return (pcireg_t) -1;
s = 0; /* XXX gcc -Wuninitialized */
/* secondary if bus # != 0 */
pci_decompose_tag(&lcp->lc_pc, tag, &secondary, &d, &f);
if (secondary) {
s = splhigh();
alpha_mb();
REGVAL(LCA_IOC_CONF) = 0x01;
alpha_mb();
confaddr = tag;
} else {
confaddr = lca_make_type0addr(d, f);
}
datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(LCA_PCI_CONF |
confaddr << 5UL | /* XXX */
(offset & ~0x03) << 5 | /* XXX */
0 << 5 | /* XXX */
0x3 << 3); /* XXX */
data = (pcireg_t)-1;
if (!(ba = badaddr(datap, sizeof *datap)))
data = *datap;
if (secondary) {
alpha_mb();
REGVAL(LCA_IOC_CONF) = 0x00;
alpha_mb();
splx(s);
}
#if 0
printf("lca_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg,
data, datap, ba ? " (badaddr)" : "");
#endif
return data;
}
static void
lca_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
{
struct lca_config *lcp = cpv;
pcireg_t *datap;
paddr_t confaddr;
int s, secondary, d, f;
if ((unsigned int)offset >= PCI_CONF_SIZE)
return;
s = 0; /* XXX gcc -Wuninitialized */
/* secondary if bus # != 0 */
pci_decompose_tag(&lcp->lc_pc, tag, &secondary, &d, &f);
if (secondary) {
s = splhigh();
alpha_mb();
REGVAL(LCA_IOC_CONF) = 0x01;
alpha_mb();
confaddr = tag;
} else {
confaddr = lca_make_type0addr(d, f);
}
datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(LCA_PCI_CONF |
confaddr << 5UL | /* XXX */
(offset & ~0x03) << 5 | /* XXX */
0 << 5 | /* XXX */
0x3 << 3); /* XXX */
*datap = data;
if (secondary) {
alpha_mb();
REGVAL(LCA_IOC_CONF) = 0x00;
alpha_mb();
splx(s);
}
#if 0
printf("lca_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag,
reg, data, datap);
#endif
}
