1 /* $NetBSD: lca_pci.c,v 1.24 2021/06/25 03:52:41 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: lca_pci.c,v 1.24 2021/06/25 03:52:41 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/lcareg.h>
42 #include <alpha/pci/lcavar.h>
43
44 static int lca_bus_maxdevs(void *, int);
45 static pcireg_t lca_conf_read(void *, pcitag_t, int);
46 static void lca_conf_write(void *, pcitag_t, int, pcireg_t);
47
48 void
lca_pci_init(pci_chipset_tag_t pc,void * v)49 lca_pci_init(pci_chipset_tag_t pc, void *v)
50 {
51
52 pc->pc_conf_v = v;
53 pc->pc_bus_maxdevs = lca_bus_maxdevs;
54 pc->pc_conf_read = lca_conf_read;
55 pc->pc_conf_write = lca_conf_write;
56 }
57
58 static int
lca_bus_maxdevs(void * cpv,int busno)59 lca_bus_maxdevs(void *cpv, int busno)
60 {
61 /*
62 * We have to drive the IDSEL directly on bus 0, so we are
63 * limited to 16 devices there.
64 */
65 return busno == 0 ? 16 : 32;
66 }
67
68 static paddr_t
lca_make_type0addr(int d,int f)69 lca_make_type0addr(int d, int f)
70 {
71 KASSERT(d < 16);
72 return PCI_CONF_TYPE0_IDSEL(d) | __SHIFTIN(f, PCI_CONF_TYPE0_FUNCTION);
73 }
74
75 static pcireg_t
lca_conf_read(void * cpv,pcitag_t tag,int offset)76 lca_conf_read(void *cpv, pcitag_t tag, int offset)
77 {
78 struct lca_config *lcp = cpv;
79 pcireg_t *datap, data;
80 paddr_t confaddr;
81 int s, secondary, d, f, ba;
82
83 if ((unsigned int)offset >= PCI_CONF_SIZE)
84 return (pcireg_t) -1;
85
86 s = 0; /* XXX gcc -Wuninitialized */
87
88 /* secondary if bus # != 0 */
89 pci_decompose_tag(&lcp->lc_pc, tag, &secondary, &d, &f);
90 if (secondary) {
91 s = splhigh();
92 alpha_mb();
93 REGVAL(LCA_IOC_CONF) = 0x01;
94 alpha_mb();
95 confaddr = tag;
96 } else {
97 confaddr = lca_make_type0addr(d, f);
98 }
99
100 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(LCA_PCI_CONF |
101 confaddr << 5UL | /* XXX */
102 (offset & ~0x03) << 5 | /* XXX */
103 0 << 5 | /* XXX */
104 0x3 << 3); /* XXX */
105 data = (pcireg_t)-1;
106 if (!(ba = badaddr(datap, sizeof *datap)))
107 data = *datap;
108
109 if (secondary) {
110 alpha_mb();
111 REGVAL(LCA_IOC_CONF) = 0x00;
112 alpha_mb();
113 splx(s);
114 }
115
116 #if 0
117 printf("lca_conf_read: tag 0x%lx, reg 0x%lx -> %x @ %p%s\n", tag, reg,
118 data, datap, ba ? " (badaddr)" : "");
119 #endif
120
121 return data;
122 }
123
124 static void
lca_conf_write(void * cpv,pcitag_t tag,int offset,pcireg_t data)125 lca_conf_write(void *cpv, pcitag_t tag, int offset, pcireg_t data)
126 {
127 struct lca_config *lcp = cpv;
128 pcireg_t *datap;
129 paddr_t confaddr;
130 int s, secondary, d, f;
131
132 if ((unsigned int)offset >= PCI_CONF_SIZE)
133 return;
134
135 s = 0; /* XXX gcc -Wuninitialized */
136
137 /* secondary if bus # != 0 */
138 pci_decompose_tag(&lcp->lc_pc, tag, &secondary, &d, &f);
139 if (secondary) {
140 s = splhigh();
141 alpha_mb();
142 REGVAL(LCA_IOC_CONF) = 0x01;
143 alpha_mb();
144 confaddr = tag;
145 } else {
146 confaddr = lca_make_type0addr(d, f);
147 }
148
149 datap = (pcireg_t *)ALPHA_PHYS_TO_K0SEG(LCA_PCI_CONF |
150 confaddr << 5UL | /* XXX */
151 (offset & ~0x03) << 5 | /* XXX */
152 0 << 5 | /* XXX */
153 0x3 << 3); /* XXX */
154 *datap = data;
155
156 if (secondary) {
157 alpha_mb();
158 REGVAL(LCA_IOC_CONF) = 0x00;
159 alpha_mb();
160 splx(s);
161 }
162
163 #if 0
164 printf("lca_conf_write: tag 0x%lx, reg 0x%lx -> 0x%x @ %p\n", tag,
165 reg, data, datap);
166 #endif
167 }
168