irongate_pci.c revision 1.6 
1/* $NetBSD: irongate_pci.c,v 1.6 2009/03/14 14:45:53 dsl Exp $ */
2
3/*-
4 * Copyright (c) 2000 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32/*
33 * PCI Configuration Space support for the AMD 751 (``Irongate'') core logic
34 * chipset.
35 */
36
37#include <sys/cdefs.h>			/* RCS ID & Copyright macro defns */
38
39__KERNEL_RCSID(0, "$NetBSD: irongate_pci.c,v 1.6 2009/03/14 14:45:53 dsl Exp $");
40
41#include <sys/param.h>
42#include <sys/systm.h>
43#include <sys/kernel.h>
44#include <sys/device.h>
45
46#include <uvm/uvm_extern.h>
47
48#include <dev/pci/pcireg.h>
49#include <dev/pci/pcivar.h>
50#include <alpha/pci/irongatereg.h>
51#include <alpha/pci/irongatevar.h>
52
53void		irongate_attach_hook(struct device *, struct device *,
54		    struct pcibus_attach_args *);
55int		irongate_bus_maxdevs(void *, int);
56pcitag_t	irongate_make_tag(void *, int, int, int);
57void		irongate_decompose_tag(void *, pcitag_t, int *, int *,
58		    int *);
59pcireg_t	irongate_conf_read(void *, pcitag_t, int);
60void		irongate_conf_write(void *, pcitag_t, int, pcireg_t);
61
62/* AMD 751 systems are always single-processor, so this is easy. */
63#define	PCI_CONF_LOCK(s)	(s) = splhigh()
64#define	PCI_CONF_UNLOCK(s)	splx((s))
65
66#define	PCI_CONF_ADDR	(IRONGATE_IO_BASE|IRONGATE_CONFADDR)
67#define	PCI_CONF_DATA	(IRONGATE_IO_BASE|IRONGATE_CONFDATA)
68
69#define	REGVAL(r)	(*(volatile u_int32_t *)ALPHA_PHYS_TO_K0SEG(r))
70
71void
72irongate_pci_init(pci_chipset_tag_t pc, void *v)
73{
74
75	pc->pc_conf_v = v;
76	pc->pc_attach_hook = irongate_attach_hook;
77	pc->pc_bus_maxdevs = irongate_bus_maxdevs;
78	pc->pc_make_tag = irongate_make_tag;
79	pc->pc_decompose_tag = irongate_decompose_tag;
80	pc->pc_conf_read = irongate_conf_read;
81	pc->pc_conf_write = irongate_conf_write;
82}
83
84void
85irongate_attach_hook(struct device *parent, struct device *self,
86    struct pcibus_attach_args *pba)
87{
88}
89
90int
91irongate_bus_maxdevs(void *ipv, int busno)
92{
93
94	return 32;
95}
96
97pcitag_t
98irongate_make_tag(void *ipv, int b, int d, int f)
99{
100
101	return (b << 16) | (d << 11) | (f << 8);
102}
103
104void
105irongate_decompose_tag(void *ipv, pcitag_t tag, int *bp, int *dp, int *fp)
106{
107
108	if (bp != NULL)
109		*bp = (tag >> 16) & 0xff;
110	if (dp != NULL)
111		*dp = (tag >> 11) & 0x1f;
112	if (fp != NULL)
113		*fp = (tag >> 8) & 0x7;
114}
115
116pcireg_t
117irongate_conf_read(void *ipv, pcitag_t tag, int offset)
118{
119	int d;
120
121	/*
122	 * The AMD 751 appears in PCI configuration space, but
123	 * that is ... counter-intuitive to the way we normally
124	 * attach PCI-Host bridges on the Alpha.  So, filter out
125	 * the AMD 751 device here.  We provide a private entry
126	 * point for getting at it from machdep code.
127	 */
128	irongate_decompose_tag(ipv, tag, NULL, &d, NULL);
129	if (d == IRONGATE_PCIHOST_DEV && offset == PCI_ID_REG)
130		return ((pcireg_t) -1);
131
132	return (irongate_conf_read0(ipv, tag, offset));
133}
134
135pcireg_t
136irongate_conf_read0(void *ipv, pcitag_t tag, int offset)
137{
138	pcireg_t data;
139	int s;
140
141	PCI_CONF_LOCK(s);
142	REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff));
143	alpha_mb();
144	data = REGVAL(PCI_CONF_DATA);
145	REGVAL(PCI_CONF_ADDR) = 0;
146	alpha_mb();
147	PCI_CONF_UNLOCK(s);
148
149	return (data);
150}
151
152void
153irongate_conf_write(void *ipv, pcitag_t tag, int offset, pcireg_t data)
154{
155	int s;
156
157	PCI_CONF_LOCK(s);
158	REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff));
159	alpha_mb();
160	REGVAL(PCI_CONF_DATA) = data;
161	alpha_mb();
162	REGVAL(PCI_CONF_ADDR) = 0;
163	alpha_mb();
164	PCI_CONF_UNLOCK(s);
165}
166