1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
/*
* The PCI Library -- Capabilities
*
* Copyright (c) 2008 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL v2+.
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include <string.h>
#include "internal.h"
static void
pci_add_cap(struct pci_dev *d, unsigned int addr, unsigned int id, unsigned int type)
{
struct pci_cap *cap = pci_malloc(d->access, sizeof(*cap));
if (d->last_cap)
d->last_cap->next = cap;
else
d->first_cap = cap;
d->last_cap = cap;
cap->next = NULL;
cap->addr = addr;
cap->id = id;
cap->type = type;
d->access->debug("%04x:%02x:%02x.%d: Found capability %04x of type %d at %04x\n",
d->domain, d->bus, d->dev, d->func, id, type, addr);
}
static void
pci_scan_trad_caps(struct pci_dev *d)
{
word status = pci_read_word(d, PCI_STATUS);
byte been_there[256];
int where;
if (!(status & PCI_STATUS_CAP_LIST))
return;
memset(been_there, 0, 256);
where = pci_read_byte(d, PCI_CAPABILITY_LIST) & ~3;
while (where)
{
byte id = pci_read_byte(d, where + PCI_CAP_LIST_ID);
byte next = pci_read_byte(d, where + PCI_CAP_LIST_NEXT) & ~3;
if (been_there[where]++)
break;
if (id == 0xff)
break;
pci_add_cap(d, where, id, PCI_CAP_NORMAL);
where = next;
}
}
static void
pci_scan_ext_caps(struct pci_dev *d)
{
byte been_there[0x1000];
int where = 0x100;
if (!pci_find_cap(d, PCI_CAP_ID_EXP, PCI_CAP_NORMAL))
return;
memset(been_there, 0, 0x1000);
do
{
u32 header;
int id;
header = pci_read_long(d, where);
if (!header || header == 0xffffffff)
break;
id = header & 0xffff;
if (been_there[where]++)
break;
pci_add_cap(d, where, id, PCI_CAP_EXTENDED);
where = (header >> 20) & ~3;
}
while (where);
}
void
pci_scan_caps(struct pci_dev *d, unsigned int want_fields)
{
if (want_fields & PCI_FILL_EXT_CAPS)
want_fields |= PCI_FILL_CAPS;
if (want_fill(d, want_fields, PCI_FILL_CAPS))
pci_scan_trad_caps(d);
if (want_fill(d, want_fields, PCI_FILL_EXT_CAPS))
pci_scan_ext_caps(d);
}
void
pci_free_caps(struct pci_dev *d)
{
struct pci_cap *cap;
while (cap = d->first_cap)
{
d->first_cap = cap->next;
pci_mfree(cap);
}
}
struct pci_cap *
pci_find_cap(struct pci_dev *d, unsigned int id, unsigned int type)
{
return pci_find_cap_nr(d, id, type, NULL);
}
/**
* Finds a particular capability of a device
*
* To select one capability if there are more than one with the same id, you
* can provide a pointer to an unsigned int that contains the index which you
* want as cap_number. If you don't care and are fine with the first one you
* can supply NULL. The cap_number will be replaced by the actual number
* of capabilities with that id.
*/
struct pci_cap *
pci_find_cap_nr(struct pci_dev *d, unsigned int id, unsigned int type,
unsigned int *cap_number)
{
struct pci_cap *c;
struct pci_cap *found = NULL;
unsigned int target = (cap_number ? *cap_number : 0);
unsigned int index = 0;
pci_fill_info_v313(d, ((type == PCI_CAP_NORMAL) ? PCI_FILL_CAPS : PCI_FILL_EXT_CAPS));
for (c=d->first_cap; c; c=c->next)
{
if (c->type == type && c->id == id)
{
if (target == index)
found = c;
index++;
}
}
if (cap_number)
*cap_number = index;
return found;
}
|
