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/* $OpenBSD: irongate_pci.c,v 1.5 2008/06/26 05:42:08 ray Exp $ */
/* $NetBSD: irongate_pci.c,v 1.2 2000/06/29 08:58:47 mrg Exp $ */
/*-
* Copyright (c) 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.
*/
/*
* PCI Configuration Space support for the AMD 751 (``Irongate'') core logic
* chipset.
*/
#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/irongatereg.h>
#include <alpha/pci/irongatevar.h>
void irongate_attach_hook(struct device *, struct device *,
struct pcibus_attach_args *);
int irongate_bus_maxdevs(void *, int);
pcitag_t irongate_make_tag(void *, int, int, int);
void irongate_decompose_tag(void *, pcitag_t, int *, int *,
int *);
pcireg_t irongate_conf_read(void *, pcitag_t, int);
void irongate_conf_write(void *, pcitag_t, int, pcireg_t);
/* AMD 751 systems are always single-processor, so this is easy. */
#define PCI_CONF_LOCK(s) (s) = splhigh()
#define PCI_CONF_UNLOCK(s) splx((s))
#define PCI_CONF_ADDR (IRONGATE_IO_BASE|IRONGATE_CONFADDR)
#define PCI_CONF_DATA (IRONGATE_IO_BASE|IRONGATE_CONFDATA)
#define REGVAL(r) (*(__volatile u_int32_t *)ALPHA_PHYS_TO_K0SEG(r))
void
irongate_pci_init(pci_chipset_tag_t pc, void *v)
{
pc->pc_conf_v = v;
pc->pc_attach_hook = irongate_attach_hook;
pc->pc_bus_maxdevs = irongate_bus_maxdevs;
pc->pc_make_tag = irongate_make_tag;
pc->pc_decompose_tag = irongate_decompose_tag;
pc->pc_conf_read = irongate_conf_read;
pc->pc_conf_write = irongate_conf_write;
}
void
irongate_attach_hook(struct device *parent, struct device *self,
struct pcibus_attach_args *pba)
{
}
int
irongate_bus_maxdevs(void *ipv, int busno)
{
return 32;
}
pcitag_t
irongate_make_tag(void *ipv, int b, int d, int f)
{
return (b << 16) | (d << 11) | (f << 8);
}
void
irongate_decompose_tag(void *ipv, 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;
}
pcireg_t
irongate_conf_read(void *ipv, pcitag_t tag, int offset)
{
int d;
/*
* The AMD 751 appears in PCI configuration space, but
* that is ... counter-intuitive to the way we normally
* attach PCI-Host bridges on the Alpha. So, filter out
* the AMD 751 device here. We provide a private entry
* point for getting at it from machdep code.
*/
irongate_decompose_tag(ipv, tag, NULL, &d, NULL);
if (d == IRONGATE_PCIHOST_DEV)
return ((pcireg_t) -1);
return (irongate_conf_read0(ipv, tag, offset));
}
pcireg_t
irongate_conf_read0(void *ipv, pcitag_t tag, int offset)
{
pcireg_t data;
int s;
PCI_CONF_LOCK(s);
REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff));
alpha_mb();
data = REGVAL(PCI_CONF_DATA);
REGVAL(PCI_CONF_ADDR) = 0;
alpha_mb();
PCI_CONF_UNLOCK(s);
return (data);
}
void
irongate_conf_write(void *ipv, pcitag_t tag, int offset, pcireg_t data)
{
int s;
PCI_CONF_LOCK(s);
REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff));
alpha_mb();
REGVAL(PCI_CONF_DATA) = data;
alpha_mb();
REGVAL(PCI_CONF_ADDR) = 0;
alpha_mb();
PCI_CONF_UNLOCK(s);
}
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