1 /* $NetBSD: irongate_pci.c,v 1.13 2024/04/03 04:30:30 thorpej 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 1.13 2024/04/03 04:30:30 thorpej 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 <dev/pci/pcireg.h>
47 #include <dev/pci/pcivar.h>
48 #include <alpha/pci/irongatereg.h>
49 #include <alpha/pci/irongatevar.h>
50
51 static pcireg_t irongate_conf_read(void *, pcitag_t, int);
52 static void irongate_conf_write(void *, pcitag_t, int, pcireg_t);
53
54 /* AMD 751 systems are always single-processor, so this is easy. */
55 #define PCI_CONF_LOCK(s) (s) = splhigh()
56 #define PCI_CONF_UNLOCK(s) splx((s))
57
58 #define PCI_CONF_ADDR (IRONGATE_IO_BASE|IRONGATE_CONFADDR)
59 #define PCI_CONF_DATA (IRONGATE_IO_BASE|IRONGATE_CONFDATA)
60
61 #define REGVAL(r) (*(volatile uint32_t *)ALPHA_PHYS_TO_K0SEG(r))
62
63 void
irongate_pci_init(pci_chipset_tag_t pc,void * v)64 irongate_pci_init(pci_chipset_tag_t pc, void *v)
65 {
66
67 pc->pc_conf_v = v;
68 pc->pc_conf_read = irongate_conf_read;
69 pc->pc_conf_write = irongate_conf_write;
70 }
71
72 static pcireg_t
irongate_conf_read(void * ipv,pcitag_t tag,int offset)73 irongate_conf_read(void *ipv, pcitag_t tag, int offset)
74 {
75 int b, d;
76
77 if ((unsigned int)offset >= PCI_CONF_SIZE)
78 return (pcireg_t) -1;
79
80 struct irongate_config * const icp = ipv;
81
82 /*
83 * The AMD 751 appears in PCI configuration space, but
84 * that is ... counter-intuitive to the way we normally
85 * attach PCI-Host bridges on the Alpha. So, filter out
86 * the AMD 751 device here. We provide a private entry
87 * point for getting at it from machdep code.
88 */
89 pci_decompose_tag(&icp->ic_pc, tag, &b, &d, NULL);
90 if (b == 0 && d == IRONGATE_PCIHOST_DEV && offset == PCI_ID_REG)
91 return ((pcireg_t) -1);
92
93 return (irongate_conf_read0(ipv, tag, offset));
94 }
95
96 pcireg_t
irongate_conf_read0(void * ipv,pcitag_t tag,int offset)97 irongate_conf_read0(void *ipv, pcitag_t tag, int offset)
98 {
99 pcireg_t data;
100 int s;
101
102 if ((unsigned int)offset >= PCI_CONF_SIZE)
103 return (pcireg_t) -1;
104
105 PCI_CONF_LOCK(s);
106 REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff));
107 alpha_mb();
108 data = REGVAL(PCI_CONF_DATA);
109 alpha_mb();
110 REGVAL(PCI_CONF_ADDR) = 0;
111 alpha_mb();
112 PCI_CONF_UNLOCK(s);
113
114 return (data);
115 }
116
117 static void
irongate_conf_write(void * ipv,pcitag_t tag,int offset,pcireg_t data)118 irongate_conf_write(void *ipv, pcitag_t tag, int offset, pcireg_t data)
119 {
120 int s;
121
122 if ((unsigned int)offset >= PCI_CONF_SIZE)
123 return;
124
125 PCI_CONF_LOCK(s);
126 REGVAL(PCI_CONF_ADDR) = (CONFADDR_ENABLE | tag | (offset & 0xff));
127 alpha_mb();
128 REGVAL(PCI_CONF_DATA) = data;
129 alpha_mb();
130 REGVAL(PCI_CONF_ADDR) = 0;
131 alpha_mb();
132 PCI_CONF_UNLOCK(s);
133 }
134