NetBSD-5.0.2/sys/arch/alpha/pci/ttwoga_pci.c
/* $NetBSD: ttwoga_pci.c,v 1.4 2008/04/28 20:23:11 martin Exp $ */
/*-
* Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* 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.
*
* 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.
*/
#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
__KERNEL_RCSID(0, "$NetBSD: ttwoga_pci.c,v 1.4 2008/04/28 20:23:11 martin Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/device.h>
#include <sys/simplelock.h>
#include <dev/pci/pcireg.h>
#include <dev/pci/pcivar.h>
#include <alpha/pci/ttwogareg.h>
#include <alpha/pci/ttwogavar.h>
void ttwoga_attach_hook(struct device *, struct device *,
struct pcibus_attach_args *);
int ttwoga_bus_maxdevs(void *, int);
pcitag_t ttwoga_make_tag(void *, int, int, int);
void ttwoga_decompose_tag(void *, pcitag_t, int *, int *,
int *);
pcireg_t ttwoga_conf_read(void *, pcitag_t, int);
void ttwoga_conf_write(void *, pcitag_t, int, pcireg_t);
paddr_t ttwoga_make_type0addr(int, int);
/*
* The T2 has an annoying bug that can manifest itself while
* probing for devices. If a non-existent CBUS address is
* accessed with a read, "a few" subsequent write cycles
* will generate spurious memory errors. We work around this
* by tracking which CPU has the PCI configuration mutex and
* "expect" machine checks on that CPU for the duraction of
* the PCI configuration access routine.
*/
struct simplelock ttwoga_conf_slock;
cpuid_t ttwoga_conf_cpu; /* XXX core logic bug */
#define TTWOGA_CONF_LOCK(s) \
do { \
(s) = splhigh(); \
simple_lock(&ttwoga_conf_slock); \
ttwoga_conf_cpu = cpu_number(); \
} while (0)
#define TTWOGA_CONF_UNLOCK(s) \
do { \
ttwoga_conf_cpu = (cpuid_t)-1; \
simple_unlock(&ttwoga_conf_slock); \
splx((s)); \
} while (0)
void
ttwoga_pci_init(pci_chipset_tag_t pc, void *v)
{
simple_lock_init(&ttwoga_conf_slock);
pc->pc_conf_v = v;
pc->pc_attach_hook = ttwoga_attach_hook;
pc->pc_bus_maxdevs = ttwoga_bus_maxdevs;
pc->pc_make_tag = ttwoga_make_tag;
pc->pc_decompose_tag = ttwoga_decompose_tag;
pc->pc_conf_read = ttwoga_conf_read;
pc->pc_conf_write = ttwoga_conf_write;
}
void
ttwoga_attach_hook(struct device *parent, struct device *self,
struct pcibus_attach_args *pba)
{
}
int
ttwoga_bus_maxdevs(void *cpv, int busno)
{
return 32;
}
pcitag_t
ttwoga_make_tag(void *cpv, int b, int d, int f)
{
/* This is the format used for Type 1 configuration cycles. */
return (b << 16) | (d << 11) | (f << 8);
}
void
ttwoga_decompose_tag(void *cpv, pcitag_t tag, int *bp, int *dp, int *fp)
{
if (bp != NULL)
*bp = (tag >> 16) & 0xff;
if (dp != NULL)
*dp = (tag >> 11) & 0x1f;
if (fp != NULL)
*fp = (tag >> 8) & 0x7;
}
paddr_t
ttwoga_make_type0addr(int d, int f)
{
if (d > 8) /* XXX ??? */
return ((paddr_t) -1);
return ((0x0800UL << d) | (f << 8));
}
pcireg_t
ttwoga_conf_read(void *cpv, pcitag_t tag, int offset)
{
struct ttwoga_config *tcp = cpv;
pcireg_t *datap, data;
int s, b, d, f, ba;
paddr_t addr;
u_int64_t old_hae3;
pci_decompose_tag(&tcp->tc_pc, tag, &b, &d, &f);
addr = b ? tag : ttwoga_make_type0addr(d, f);
if (addr == (paddr_t)-1)
return ((pcireg_t) -1);
TTWOGA_CONF_LOCK(s);
alpha_mb();
old_hae3 = T2GA(tcp, T2_HAE0_3) & ~HAE0_3_PCA;
T2GA(tcp, T2_HAE0_3) =
old_hae3 | ((b ? 1UL : 0UL) << HAE0_3_PCA_SHIFT);
alpha_mb();
alpha_mb();
datap =
(pcireg_t *)ALPHA_PHYS_TO_K0SEG(tcp->tc_sysmap->tsmap_conf_base |
addr << 5UL | /* address shift */
(offset & ~0x03) << 5UL | /* address shift */
0x3 << 3UL); /* 4-byte, size shift */
data = (pcireg_t)-1;
if (!(ba = badaddr(datap, sizeof *datap)))
data = *datap;
alpha_mb();
T2GA(tcp, T2_HAE0_3) = old_hae3;
alpha_mb();
alpha_mb();
alpha_pal_draina();
alpha_mb();
alpha_mb();
TTWOGA_CONF_UNLOCK(s);
#if 0
printf("ttwoga_conf_read: tag 0x%lx, reg 0x%x -> 0x%x @ %p%s\n",
tag, offset, data, datap, ba ? " (badaddr)" : "");
#endif
return (data);
}
void
ttwoga_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
{
struct ttwoga_config *tcp = cpv;
pcireg_t *datap;
int s, b, d, f;
paddr_t addr;
u_int64_t old_hae3;
pci_decompose_tag(&tcp->tc_pc, tag, &b, &d, &f);
addr = b ? tag : ttwoga_make_type0addr(d, f);
if (addr == (paddr_t)-1)
return;
TTWOGA_CONF_LOCK(s);
alpha_mb();
old_hae3 = T2GA(tcp, T2_HAE0_3) & ~HAE0_3_PCA;
T2GA(tcp, T2_HAE0_3) =
old_hae3 | ((b ? 1UL : 0UL) << HAE0_3_PCA_SHIFT);
alpha_mb();
alpha_mb();
datap =
(pcireg_t *)ALPHA_PHYS_TO_K0SEG(tcp->tc_sysmap->tsmap_conf_base |
addr << 5UL | /* address shift */
(offset & ~0x03) << 5UL | /* address shift */
0x3 << 3UL); /* 4-byte, size shift */
alpha_mb();
*datap = data;
alpha_mb();
alpha_mb();
alpha_mb();
T2GA(tcp, T2_HAE0_3) = old_hae3;
alpha_mb();
alpha_mb();
TTWOGA_CONF_UNLOCK(s);
#if 0
printf("ttwoga_conf_write: tag 0x%lx, reg 0x%x -> 0x%x @ %p\n",
tag, offset, data, datap);
#endif
}