1 /* $NetBSD: apecs_pci.c,v 1.28 2021/06/25 03:45:59 thorpej Exp $ */
2
3 /*
4 * Copyright (c) 1995, 1996 Carnegie-Mellon University.
5 * All rights reserved.
6 *
7 * Author: Chris G. Demetriou
8 *
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
22 * School of Computer Science
23 * Carnegie Mellon University
24 * Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
28 */
29
30 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
31
32 __KERNEL_RCSID(0, "$NetBSD: apecs_pci.c,v 1.28 2021/06/25 03:45:59 thorpej Exp $");
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/device.h>
38
39 #include <dev/pci/pcireg.h>
40 #include <dev/pci/pcivar.h>
41 #include <alpha/pci/apecsreg.h>
42 #include <alpha/pci/apecsvar.h>
43
44 static pcireg_t apecs_conf_read(void *, pcitag_t, int);
45 static void apecs_conf_write(void *, pcitag_t, int, pcireg_t);
46
47 void
apecs_pci_init(pci_chipset_tag_t pc,void * v)48 apecs_pci_init(pci_chipset_tag_t pc, void *v)
49 {
50
51 pc->pc_conf_v = v;
52 pc->pc_conf_read = apecs_conf_read;
53 pc->pc_conf_write = apecs_conf_write;
54 }
55
56 static pcireg_t
apecs_conf_read(void * cpv,pcitag_t tag,int offset)57 apecs_conf_read(void *cpv, pcitag_t tag, int offset)
58 {
59 struct apecs_config *acp = cpv;
60 pcireg_t *datap, data;
61 int s, secondary, ba;
62 int32_t old_haxr2; /* XXX */
63
64 if ((unsigned int)offset >= PCI_CONF_SIZE)
65 return (pcireg_t) -1;
66
67 s = 0; /* XXX gcc -Wuninitialized */
68 old_haxr2 = 0; /* XXX gcc -Wuninitialized */
69
70 /* secondary if bus # != 0 */
71 pci_decompose_tag(&acp->ac_pc, tag, &secondary, 0, 0);
72 if (secondary) {
73 s = splhigh();
74 old_haxr2 = REGVAL(EPIC_HAXR2);
75 alpha_mb();
76 REGVAL(EPIC_HAXR2) = old_haxr2 | 0x1;
77 alpha_mb();
78 }
79
80 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(APECS_PCI_CONF |
81 tag << 5UL | /* XXX */
82 (offset & ~0x03) << 5 | /* XXX */
83 0 << 5 | /* XXX */
84 0x3 << 3); /* XXX */
85 data = (pcireg_t)-1;
86 if (!(ba = badaddr(datap, sizeof *datap)))
87 data = *datap;
88
89 if (secondary) {
90 alpha_mb();
91 REGVAL(EPIC_HAXR2) = old_haxr2;
92 alpha_mb();
93 splx(s);
94 }
95
96 #if 0
97 printf("apecs_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg,
98 data, datap, ba ? " (badaddr)" : "");
99 #endif
100
101 return data;
102 }
103
104 static void
apecs_conf_write(void * cpv,pcitag_t tag,int offset,pcireg_t data)105 apecs_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
106 {
107 struct apecs_config *acp = cpv;
108 pcireg_t *datap;
109 int s, secondary;
110 int32_t old_haxr2; /* XXX */
111
112 if ((unsigned int)offset >= PCI_CONF_SIZE)
113 return;
114
115 s = 0; /* XXX gcc -Wuninitialized */
116 old_haxr2 = 0; /* XXX gcc -Wuninitialized */
117
118 /* secondary if bus # != 0 */
119 pci_decompose_tag(&acp->ac_pc, tag, &secondary, 0, 0);
120 if (secondary) {
121 s = splhigh();
122 old_haxr2 = REGVAL(EPIC_HAXR2);
123 alpha_mb();
124 REGVAL(EPIC_HAXR2) = old_haxr2 | 0x1;
125 alpha_mb();
126 }
127
128 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(APECS_PCI_CONF |
129 tag << 5UL | /* XXX */
130 (offset & ~0x03) << 5 | /* XXX */
131 0 << 5 | /* XXX */
132 0x3 << 3); /* XXX */
133
134 alpha_mb();
135 *datap = data;
136 alpha_mb();
137 alpha_mb();
138
139 if (secondary) {
140 alpha_mb();
141 REGVAL(EPIC_HAXR2) = old_haxr2;
142 alpha_mb();
143 splx(s);
144 }
145
146 #if 0
147 printf("apecs_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag,
148 reg, data, datap);
149 #endif
150 }
151